JP3358852B2 - Valve train for internal combustion engine - Google Patents

Valve train for internal combustion engine

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Publication number
JP3358852B2
JP3358852B2 JP29843693A JP29843693A JP3358852B2 JP 3358852 B2 JP3358852 B2 JP 3358852B2 JP 29843693 A JP29843693 A JP 29843693A JP 29843693 A JP29843693 A JP 29843693A JP 3358852 B2 JP3358852 B2 JP 3358852B2
Authority
JP
Japan
Prior art keywords
cam
connection
rocker arm
speed
engine
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Fee Related
Application number
JP29843693A
Other languages
Japanese (ja)
Other versions
JPH07150919A (en
Inventor
究 武士俣
徹 雨宮
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Honda Motor Co Ltd
Original Assignee
Honda Motor Co Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Honda Motor Co Ltd filed Critical Honda Motor Co Ltd
Priority to JP29843693A priority Critical patent/JP3358852B2/en
Publication of JPH07150919A publication Critical patent/JPH07150919A/en
Application granted granted Critical
Publication of JP3358852B2 publication Critical patent/JP3358852B2/en
Anticipated expiration legal-status Critical
Expired - Fee Related legal-status Critical Current

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  • Valve Device For Special Equipments (AREA)

Description

【発明の詳細な説明】DETAILED DESCRIPTION OF THE INVENTION

【0001】[0001]

【産業上の利用分野】本発明は,プロフィルを相互に異
ならせてカムシャフトに設けられる3つ以上のカムと,
それらのカムに個別に対応して同一揺動軸線まわりに揺
動可能に配置されるとともに少なくとも1つに機関弁が
連動,連結される複数のカムフォロアと,前記揺動軸線
と平行な軸線に沿う連結位置および連結解除位置間での
相互に独立した切換作動を可能とした連結ピンをそれぞ
れ有するとともに該連結ピンにより連結されるカムフォ
ロアの組合せを異ならせた複数の連結分離手段とを備え
る内燃機関の動弁装置に関する。
The present invention relates to three or more cams provided on a camshaft with different profiles.
A plurality of cam followers, each of which is arranged so as to be able to swing around the same swing axis corresponding to each of the cams and at least one of which the engine valve is interlocked and connected, and along an axis parallel to the swing axis. An internal combustion engine having a plurality of connection / separation means each having a connection pin enabling a mutually independent switching operation between a connection position and a connection release position and having different combinations of cam followers connected by the connection pin. The present invention relates to a valve train.

【0002】[0002]

【従来の技術】従来,かかる動弁装置は,たとえば特開
昭63−57805号公報等で既に知られている。
2. Description of the Related Art Conventionally, such a valve train is already known, for example, from Japanese Patent Application Laid-Open No. 63-57805.

【0003】[0003]

【発明が解決しようとする課題】ところで,上記公報で
開示されている動弁装置では,3つのロッカアームが相
互に隣接配置され,相互に隣接した一対ずつ2組のロッ
カアームの連結および連結解除を切換えることにより,
機関の低速運転状態,中速運転状態および高速運転状態
の3つの運転状態に応じて一対の機関弁の作動特性を変
更するようにしている。ところが,このものでは,隣接
ロッカアームとの連結解除状態と連結状態とで各機関弁
の作動特性を2段階に変化させ,一対の機関弁の作動特
性の組合せを3段階に変更して機関の運転状態に応じた
3段階の作動特性変更を達成するようにしたものであ
り,機関の運転状態に応じたより精密な弁作動特性変更
制御を可能とするには,各運転域での弁作動特性の組合
せの選択自由度をより大きくすることが望ましい。
In the valve train disclosed in the above publication, three rocker arms are arranged adjacent to each other, and the connection and disconnection of two sets of rocker arms adjacent to each other are switched. By
The operating characteristics of the pair of engine valves are changed according to three operating states of the engine, a low-speed operating state, a medium-speed operating state, and a high-speed operating state. However, in this case, the operating characteristics of each engine valve are changed in two stages in the disconnected state and the connected state with the adjacent rocker arm, and the operating characteristics of the pair of engine valves are changed in three stages to operate the engine. The three-stage operation characteristic change according to the state is achieved. In order to enable more precise control of the valve operation characteristic change according to the engine operation state, the valve operation characteristic in each operation range is required. It is desirable to increase the degree of freedom in selecting combinations.

【0004】そこで,本出願人は,相互に隣接した3つ
のカムフォロアを高速用連結分離手段で全て連結可能と
するとともに,配列方向中央部のカムフォロアを跨いで
両側のカムフォロアを他の連結分離手段で連結可能と
し,各カムフォロアの配列方向に沿う一端側のカムフォ
ロアに連動,連結されている機関弁の作動特性を3段階
に変化させることにより,弁作動特性の選択の自由度を
増大させるようにした動弁装置を提案(特願平4−24
6648号)している。ところが,高速用連結分離手段
を連結解除状態とし,上記他の連結分離手段により両側
のカムフォロアを連結した状態では,配列方向中央部の
カムフォロアを跨いで両側のカムフォロアを連結した状
態となるので,連結剛性が比較的弱く,機関弁の着座時
にバウンスが生じ易い。
Accordingly, the present applicant has made all three cam followers adjacent to each other connectable by means of high-speed connection / separation means, and at the same time straddles the cam followers at the center in the arrangement direction and connects the cam followers on both sides with other connection / separation means. It is connectable, and linked to the cam follower at one end along the arrangement direction of each cam follower, the operating characteristics of the connected engine valve are changed in three stages, so that the degree of freedom in selecting the valve operating characteristics is increased. Proposed valve gear (Japanese Patent Application No. 4-24)
No. 6648). However, when the high-speed connection / separation means is in the uncoupled state and the other cam separation / following means is connected to the cam followers on both sides, the cam followers on both sides are connected across the cam follower at the center in the arrangement direction. Rigidity is relatively weak, and bounce tends to occur when the engine valve is seated.

【0005】本発明は,かかる事情に鑑みてなされたも
のであり,連結剛性を高めた上で弁作動特性の選択の自
由度増大を図った内燃機関の動弁装置を提供することを
目的とする。
SUMMARY OF THE INVENTION The present invention has been made in view of the above circumstances, and has as its object to provide a valve train for an internal combustion engine in which the degree of freedom in selecting valve operating characteristics is increased while increasing connection rigidity. I do.

【0006】[0006]

【課題を解決するための手段】上記目的を達成するため
に,請求項1記載の発明は,プロフィルを相互に異なら
せてカムシャフトに設けられる3つ以上のカムと,それ
らのカムに個別に対応して同一の揺動支軸のまわりに揺
動可能に配置されるとともに少なくとも1つに機関弁が
連動,連結される複数のカムフォロアと,前記揺動支軸
と平行な軸線に沿う連結位置および連結解除位置間での
相互に独立した切換作動を可能とした連結ピンをそれぞ
れ有するとともに該連結ピンにより連結されるカムフォ
ロアの組合せを異ならせた複数の連結分離手段とを備え
る内燃機関の動弁装置において,複数のカムは,それら
のカムのうち機関の高速運転に対応したプロフィルのカ
ムをカムシャフトの軸線に沿う外側に配置してカムシャ
フトに設けられ,機関の高速運転域で全てのカムフォロ
アを連結する状態ならびに前記高速運転域以外で連結を
解除する状態を切換可能な高速用連結分離手段と,機関
弁に連動,連結されたカムフォロアへの他のカムフォロ
アの連結および連結解除を切換可能な1あるいは複数の
連結分離手段とが,前記揺動支軸の周方向に相互に異な
る位置でカムフォロアに配設されると共に,その高速用
連結分離手段を含む全ての連結分離手段が,揺動支軸の
軸方向一端外方より見て,機関弁に連動,連結されたカ
ムフォロアの機関弁側の端部と前記揺動支軸との間を避
けた位置に配設され,前記カムシャフトは,前記揺動支
軸よりも下方に配設され,前記高速用連結分離手段は,
カムシャフトに設けたカムの直上に配設されると共に,
該揺動支軸から見て機関弁とは反対側に配置され,該高
速用連結分離手段の連結ピンと同軸に配置されて各カム
フォロアに対応するカムに転がり接触するローラが該各
カムフォロアに軸支されることを特徴とする。
To achieve the above object of the Invention The invention of Claim 1 wherein the three or more cams provided on the camshaft at different flop Rofiru mutually, individually their cam A plurality of cam followers arranged so as to be able to swing around the same swing support shaft and to have at least one engine valve interlocked and connected thereto, and a connection along an axis parallel to the swing support shaft And a plurality of connection / separation means having different combinations of cam followers connected by the connection pins, the connection pins being capable of mutually independent switching operations between a position and a connection release position. In the valve device, the plurality of cams are provided on the camshaft by arranging a cam having a profile corresponding to a high-speed operation of the engine along the axis of the camshaft. High-speed connection / separation means capable of switching between a state in which all the cam followers are connected in a high-speed operation range of the Seki and a state in which the connection is released in a state other than the high-speed operation range; and another cam follower linked to and connected to the engine valve And one or a plurality of connection / separation means capable of switching between connection and disconnection are provided on the cam follower at positions different from each other in the circumferential direction of the pivot shaft, and all the members including the high-speed connection / separation means are provided. Is connected to the engine valve and is located at a position avoiding between the end of the connected cam follower on the engine valve side and the oscillation support shaft, as viewed from the outside in the axial direction of the oscillation support shaft. And the camshaft is disposed below the swing support shaft.
It is arranged directly above the cam provided on the camshaft,
A roller, which is arranged on the opposite side of the engine valve as viewed from the swing shaft and is coaxial with the connecting pin of the high-speed connecting / separating means and is in rolling contact with a cam corresponding to each cam follower, is supported by each of the cam followers. It is the fact that to said.

【0007】[0007]

【実施例】以下,図面により参考例及び本発明の実施例
について説明する。
DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, reference examples and embodiments of the present invention will be described with reference to the drawings.

【0008】図1ないし図4は第1参考例を示すもので
あり,図1は縦断面図であって図2の1−1線に沿う断
面図,図2は図1の2矢視拡大平面図,図3は図1の3
−3線拡大断面図,図4は図1の4−4線拡大断面図で
ある。
FIGS. 1 to 4 show a first reference example. FIG. 1 is a longitudinal sectional view taken along line 1-1 of FIG. 2, and FIG. 2 is an enlarged view of FIG. FIG. 3 is a plan view, and FIG.
FIG. 4 is an enlarged sectional view taken along line 4-4 in FIG.

【0009】先ず図1および図2において,SOHC型
内燃機関におけるシリンダヘッド11には,燃焼室12
の天井面に開口するようにして一対の吸気弁口13…が
設けられる。両吸気弁口13…を個別に開閉可能な一対
の機関弁としての吸気弁V1,V2 は,シリンダヘッド
11に配設された一対のガイド筒14…にそれぞれ摺動
可能に嵌合されており,各ガイド筒14…から突出した
各吸気弁V1 ,V2 の上端部にそれぞれ固定されたリテ
ーナ15…とシリンダヘッド11との間には各吸気弁V
1 ,V2 を囲繞するコイル状の弁ばね16…がそれぞれ
介設され,それらの弁ばね16…により各吸気弁V1
2 は上方すなわち閉弁方向に付勢される。
First, in FIGS. 1 and 2, a cylinder head 11 in an SOHC type internal combustion engine has a combustion chamber 12
A pair of intake valve ports 13 are provided so as to open to the ceiling surface of the vehicle. The intake valves V 1 , V 2 as a pair of engine valves capable of individually opening and closing both intake valve ports 13 are respectively slidably fitted to a pair of guide cylinders 14 arranged on the cylinder head 11. Each intake valve V is provided between the cylinder head 11 and a retainer 15 fixed to the upper end of each intake valve V 1 , V 2 protruding from each guide cylinder 14.
1, a coil-shaped valve spring 16 surrounding the V 2 ... are interposed respectively, the intake valves V 1 by their valve springs 16 ...,
V 2 is biased upwardly i.e. closing direction.

【0010】図3を併せて参照して,両吸気弁V1 ,V
2 と,図示しない排気弁とに共通なカムシャフト17が
クランクシャフト(図示せず)に1/2の減速比で連
動,連結されており,該カムシャフト17は,シリンダ
ヘッド11と,該シリンダヘッド11上にそれぞれ結合
される複数のホルダ18とで回転自在に支承される。
Referring also to FIG. 3, both intake valves V 1 , V
2 and a camshaft 17 common to an exhaust valve (not shown) are interlocked and connected to a crankshaft (not shown) at a reduction ratio of 1/2. The camshaft 17 is connected to the cylinder head 11 and the cylinder The head 11 is rotatably supported by a plurality of holders 18 respectively coupled to the head 11.

【0011】カムシャフト17には,プロフィルを相互
に異ならせた第1,第2および第3カム19,20,2
1が,その順番にかつ相互間に間隔をあけて一体に設け
られる。第1カム19は,機関の高速運転域で両機関弁
1 ,V2 をともに開閉作動せしめるためのプロフィル
を有するものであり,カムシャフト17の中心からの距
離を一定としたベース円部19aと,該ベース円部19
aから半径方向外方に張出す高位部19bとを有する。
第2カム20は,機関の低速運転域で一方の吸気弁V1
を開閉作動せしめるとともに機関の中速運転域で両吸気
弁V1 ,V2 をともに開閉作動せしめるためのプロフィ
ルを有するものであり,前記第1カム19のベース円部
19aと同一半径のベース円部20aと,カムシャフト
17の半径方向に沿う外方への張出量を第1カム19の
高位部19bよりも小とするとともにその高位部19b
よりも狭い中心角範囲にわたってベース円部20aから
張出した高位部20bとを有する。第3カム21は,機
関の低速運転域で他方の吸気弁V2 を実質的に休止状態
とするためのプロフィルを有するものであり,前記第1
および第2カム19,20のベース円部19a,20a
と同一半径であるベース円部21aと,第1および第2
カム19,20の高位部19b,20bに対応する位置
でベース円部21aから半径方向外方にわずかに張出し
た高位部21bとを有する。
The camshaft 17 has first, second and third cams 19, 20, and 2 having different profiles.
1 are provided in that order and spaced apart from one another. The first cam 19 has a profile for opening and closing both the engine valves V 1 and V 2 in the high-speed operation range of the engine, and has a constant base circle portion 19 a with a constant distance from the center of the cam shaft 17. And the base circle portion 19
and a high-order portion 19b extending radially outward from the upper portion 19a.
The second cam 20 is connected to one of the intake valves V 1 in a low speed operation range of the engine.
And has a profile for opening and closing both intake valves V 1 and V 2 in the middle speed operation range of the engine, and has a base circle having the same radius as the base circle portion 19 a of the first cam 19. The amount of outward projection of the camshaft 17 along the radial direction is made smaller than that of the high portion 19b of the first cam 19, and the high portion 19b
And a high-order portion 20b protruding from the base circle portion 20a over a narrower central angle range. The third cam 21 is designed with a profile for substantially dormant the other intake valve V 2 in the low-speed operating range of the engine, the first
And the base circle portions 19a, 20a of the second cams 19, 20
Base circle portion 21a having the same radius as
The cams 19 and 20 have high portions 21b slightly protruding radially outward from the base circle portion 21a at positions corresponding to the high portions 19b and 20b.

【0012】第1,第2および第3カム19,20,2
1には,カムフォロアとしての第1,第2および第3ロ
ッカアーム22,23,24が個別に従動せしめられる
ものであり,それらのロッカアーム22,23,24
は,カムシャフト17の斜め上方位置で該カムシャフト
17と平行な軸線を有しながらホルダ20に固定的に支
持されたロッカアームシャフト25により,揺動軸線を
共通として揺動自在に支承される。
First, second and third cams 19, 20, 2
1 has first, second, and third rocker arms 22, 23, 24 as cam followers that are individually driven, and the rocker arms 22, 23, 24
Is rockably supported by a rocker arm shaft 25 fixedly supported by a holder 20 while having an axis parallel to the camshaft 17 at a position obliquely above the camshaft 17.

【0013】第1ロッカアーム22はロッカアームシャ
フト25からカムシャフト17側に延設されており,そ
の先端下部には第1カム19に摺接するカムスリッパ2
6が固設される。第2ロッカアーム23はロッカアーム
シャフト25から両側に延設されるものであり,その一
端側下部には第2カム20に摺接するカムスリッパ27
が固設され,他端部には一方の吸気弁V1 の上端に当接
するタペットねじ29がその螺合位置を調整可能として
螺合される。第3ロッカアーム24はロッカアームシャ
フト25から両側に延設されるものであり,その一端側
下部には第3カム21に摺接するカムスリッパ28が固
設され,他端部には他方の吸気弁V1 の上端に当接する
タペットねじ29がその螺合位置を調整可能として螺合
される。また第1ロッカアーム22は,図示しない弾発
付勢手段により,カムスリッパ26を第1カム19に摺
接させる方向に弾発付勢される。
The first rocker arm 22 extends from the rocker arm shaft 25 to the camshaft 17, and has a cam slipper 2 slidingly in contact with the first cam 19 at the lower end thereof.
6 is fixed. The second rocker arm 23 extends to both sides from the rocker arm shaft 25, and a cam slipper 27 slidingly contacting the second cam 20 is provided at a lower end of one end thereof.
A tappet screw 29 that is in contact with the upper end of one intake valve V1 is screwed to the other end so that the screwing position thereof can be adjusted. The third rocker arm 24 extends from both sides of the rocker arm shaft 25. A cam slipper 28 slidingly in contact with the third cam 21 is fixedly provided at one lower end of the third rocker arm 24, and the other intake valve V is provided at the other end. A tappet screw 29 abutting on the upper end of 1 is screwed so that its screwing position can be adjusted. The first rocker arm 22 is resiliently biased by a resilient biasing means (not shown) in a direction in which the cam slipper 26 slides on the first cam 19.

【0014】ところで,図2で示すように,カムシャフ
ト17の軸線に沿う第2カム20の幅方向中心位置を通
ってカムシャフト17の軸線に直交する平面から両吸気
弁V1 ,V2 までの距離L1 ,L2 はほぼ同一に設定さ
れる。すなわち第2カム20から第2ロッカアーム23
への駆動力作用点から両吸気弁V1 ,V2 までの距離は
ほぼ等距離に設定される。
By the way, as shown in Figure 2, to the intake valves V 1, V 2 from the plane perpendicular to the axis of the cam shaft 17 through the widthwise center position of the second cam 20 along the axis of the camshaft 17 distance L 1, L 2 of the are set to substantially the same. That is, from the second cam 20 to the second rocker arm 23
The distance from the point of application of the driving force to the intake valves V 1 and V 2 is set to be substantially equal.

【0015】第1〜第3ロッカアーム22〜24には,
機関の高速運転域で全てのロッカアーム22〜24を連
結可能な高速用連結分離手段301 が設けられ,第1〜
第3ロッカアーム22〜24のうち吸気弁V1 ,V2
それぞれ連動,連結されて相互に隣接した第2および第
3ロッカアーム23,24には,両者23,24の連結
および連結解除を高速用連結分離手段301 とは独立し
て切換可能な連結分離手段311 が設けられる。しかも
図1で示すように,前記連結分離手段311 が,第2お
よび第3ロッカアーム23,24の揺動軸線すなわちロ
ッカアームシャフト25の軸線とカム20,21との間
で第2および第3ロッカアーム23,24に設けられる
のに対し,高速用連結分離手段301 はロッカアームシ
ャフト25の軸線のまわりに前記連結分離手段311
は周方向にほぼ90度をなす角度αだけずれた位置で第
1〜第3ロッカアーム22〜24に設けられる。
The first to third rocker arms 22 to 24 include:
All of the rocker arm 22 to 24 high-speed connecting and separating means 30 1 couplable provided with high-speed operating range of the engine, first to
Intake valves V 1, V 2 are linked each of the third rocker arm 22 to 24, the second and third rocker arms 23, 24 adjacent to each other are connected, for fast coupling and uncoupling of both 23 and 24 connecting separate switchable connecting and separating means 31 1 is provided with separating means 30 1. Moreover, as shown in Figure 1, the connecting and separating means 31 1, second and third rocker arms between the second and the axis and the cam 20, 21 of the swing axis i.e. the rocker arm shaft 25 of the third rocker arms 23, 24 while provided 23 and 24, the high-speed connecting and separating means 30 1 is first in a position in which the angle α deviation constituting substantially 90 degrees in the circumferential direction as the connecting and separating means 31 1 about the axis of the rocker arm shaft 25 The first to third rocker arms 22 to 24 are provided.

【0016】図3において,連結分離手段311 は,第
2および第3ロッカアーム23,24を連結可能な連結
ピン32と,連結ピン32の移動を規制する規制部材3
3と,連結ピン32および規制部材33を連結解除側に
付勢する戻しばね34とを備える。
[0016] In FIG. 3, the connecting and separating means 31 1, the second and third rocker arms 23, 24 can be operated to connect the connecting pin 32, the regulating member 3 for restricting the movement of the connecting pin 32
3 and a return spring 34 for urging the connecting pin 32 and the regulating member 33 to the uncoupling side.

【0017】第2ロッカアーム23には,第3ロッカア
ーム24側に開放した有底のガイド穴35がロッカアー
ムシャフト25と平行に穿設されており,このガイド穴
35に連結ピン32が摺動可能に嵌合され,連結ピン3
2の一端とガイド穴35の閉塞端との間に油圧室36が
画成される。またロッカアームシャフト25には油圧路
37が設けられ,第2ロッカアーム23およびロッカア
ームシャフト25には,第2ロッカアーム23の揺動作
動にかかわらず油圧路37を油圧室36に常時連通せし
める連通路38が設けられる。
The second rocker arm 23 is provided with a bottomed guide hole 35 opened to the third rocker arm 24 side in parallel with the rocker arm shaft 25. The connecting pin 32 is slidable in the guide hole 35. Fitted, connecting pin 3
A hydraulic chamber 36 is defined between one end of the second and the closed end of the guide hole 35. A hydraulic path 37 is provided in the rocker arm shaft 25, and a communication path 38 is provided in the second rocker arm 23 and the rocker arm shaft 25 so that the hydraulic path 37 always communicates with the hydraulic chamber 36 regardless of the swinging motion of the second rocker arm 23. Provided.

【0018】第3ロッカアーム24には,前記ガイド穴
35に対応する有底のガイド穴39が第2ロッカアーム
23側に開放してロッカアームシャフト25と平行に穿
設されており,連結ピン32の他端に摺接する円板状の
規制部材33がガイド穴39に摺動可能に嵌合される。
このガイド穴39の中間部には規制部材33に当接して
該規制部材33の移動端を規制する規制段部39aが設
けられており,戻しばね34は,ガイド穴39の閉塞端
および規制部材33間に縮設される。またガイド穴39
の閉塞端には,規制部材33に同軸にかつ一体に連設さ
れたガイドロッド40を移動可能に挿通させる挿通孔4
1が設けられる。
The third rocker arm 24 has a bottomed guide hole 39 corresponding to the guide hole 35 and is opened to the second rocker arm 23 side and is bored in parallel with the rocker arm shaft 25. A disc-shaped regulating member 33 slidably in contact with the end is slidably fitted in the guide hole 39.
An intermediate portion of the guide hole 39 is provided with a regulating step 39a which abuts on the regulating member 33 and regulates the moving end of the regulating member 33. The return spring 34 is provided with the closed end of the guide hole 39 and the regulating member. 33. Guide hole 39
The guide hole 40 coaxially and integrally connected to the regulating member 33 is movably inserted into the closed end of the insertion hole 4.
1 is provided.

【0019】図4において,高速用連結分離手段301
は,第1および第2ロッカアーム22,23を連結可能
な連結ピン42と,該連結ピン42の移動を規制する規
制部材43と,連結ピン42および規制部材43を連結
解除側に付勢する戻しばね44と,第2および第3ロッ
カアーム23,24を連結可能な連結ピン45と,連結
ピン45の移動を規制する規制部材46と,連結ピン4
5および規制部材46を連結解除側に付勢する戻しばね
47とを備える。
In FIG. 4, the high-speed connection / separation means 30 1
A connecting pin 42 capable of connecting the first and second rocker arms 22 and 23, a restricting member 43 for restricting the movement of the connecting pin 42, and a return for urging the connecting pin 42 and the restricting member 43 to the uncoupling side. A spring 44, a connecting pin 45 capable of connecting the second and third rocker arms 23 and 24, a restricting member 46 for restricting the movement of the connecting pin 45, and a connecting pin 4
5 and a return spring 47 for urging the regulating member 46 to the uncoupling side.

【0020】第2ロッカアーム23には,両端を開放し
たガイド孔48がロッカアームシャフト25と平行に穿
設されており,連結ピン42,45は両者42,45間
に油圧室49を形成してガイド孔48に摺動可能に嵌合
される。またロッカアームシャフト25内には,前記連
結分離手段311 の油圧路37とは隔絶された油圧路5
0が穿設されており,第2ロッカアーム23およびロッ
カアームシャフト25には,第2ロッカアーム23の揺
動状態にかかわらず油圧室49を油圧路50に連通させ
る連通路51が設けられる。
The second rocker arm 23 has a guide hole 48 opened at both ends in parallel with the rocker arm shaft 25. The connecting pins 42 and 45 form a hydraulic chamber 49 between the two 42 and 45 to guide the second rocker arm 23. It is slidably fitted in the hole 48. The rocker arm shaft 25 in addition, the hydraulic passage 5, wherein the hydraulic passage 37 in the connecting and separating means 31 1 is isolated
The second rocker arm 23 and the rocker arm shaft 25 are provided with a communication passage 51 for communicating the hydraulic chamber 49 with the hydraulic passage 50 regardless of the swinging state of the second rocker arm 23.

【0021】第1ロッカアーム22には,前記ガイド孔
48に対応する有底のガイド穴52が第2ロッカアーム
23側に開放してロッカアームシャフト25と平行に穿
設されており,連結ピン42に摺接する円板状の規制部
材43がガイド穴52に摺動可能に嵌合される。このガ
イド穴52の中間部には規制部材43に当接して該規制
部材43の移動端を規制する規制段部52aが設けられ
ており,戻しばね44は,ガイド穴52の閉塞端および
規制部材43間に縮設される。またガイド穴52の閉塞
端には,規制部材43に同軸にかつ一体に連設されたガ
イドロッド53を移動可能に挿通させる挿通孔54が設
けられる。
A guide hole 52 having a bottom corresponding to the guide hole 48 is formed in the first rocker arm 22 so as to open toward the second rocker arm 23 and is formed in parallel with the rocker arm shaft 25. The disc-shaped regulating member 43 in contact is slidably fitted in the guide hole 52. An intermediate portion of the guide hole 52 is provided with a regulating step 52a which abuts on the regulating member 43 and regulates the moving end of the regulating member 43. The return spring 44 is provided with the closed end of the guide hole 52 and the regulating member. 43. At the closed end of the guide hole 52, an insertion hole 54 for movably inserting a guide rod 53 coaxially and integrally connected to the regulating member 43 is provided.

【0022】第3ロッカアーム24には,前記ガイド孔
48に対応する有底のガイド穴56が第2ロッカアーム
23側に開放してロッカアームシャフト25と平行に穿
設されており,連結ピン45に摺接する円板状の規制部
材46がガイド穴56に摺動可能に嵌合される。このガ
イド穴56の中間部には規制部材46に当接して該規制
部材46の移動端を規制する規制段部56aが設けられ
ており,戻しばね47は,ガイド穴56の閉塞端および
規制部材46間に縮設される。またガイド穴56の閉塞
端には,規制部材46に同軸にかつ一体に連設されたガ
イドロッド57を移動可能に挿通させる挿通孔58が設
けられる。
A guide hole 56 having a bottom corresponding to the guide hole 48 is formed in the third rocker arm 24 so as to open toward the second rocker arm 23 and is formed in parallel with the rocker arm shaft 25. The disc-shaped regulating member 46 in contact is slidably fitted in the guide hole 56. An intermediate portion of the guide hole 56 is provided with a regulating step 56a which abuts on the regulating member 46 and regulates the moving end of the regulating member 46. The return spring 47 is provided with the closed end of the guide hole 56 and the regulating member. It is contracted between 46. At the closed end of the guide hole 56, an insertion hole 58 for movably inserting a guide rod 57 coaxially and integrally connected to the regulating member 46 is provided.

【0023】ところで,ロッカアームシャフト25内に
形成されている油圧路37,50は,それらの油圧路3
7,50に油圧ポンプ59からの油圧を作用させる状
態,ならびに油圧路37,50の油圧を解放する状態を
切換可能な切換制御弁60,61が接続されており,そ
れらの切換制御弁60,61の切換作動は制御手段62
により制御される。而して該制御手段62は,機関の低
速運転域にあっては油圧路37,50の油圧を解放状態
とし,機関の中速運転域にあっては油圧路37に油圧ポ
ンプ59からの油圧を作用させるが油圧路50の油圧を
解放状態とし,機関の高速運転域にあっては両油圧路3
7,50に油圧ポンプ59からの油圧をともに作用させ
るように,両切換制御弁60,61の切換作動を制御す
るものである。
By the way, the hydraulic paths 37 and 50 formed in the rocker arm shaft 25 are
Switching control valves 60, 61 capable of switching between a state in which the hydraulic pressure from the hydraulic pump 59 is applied to the pressure control valves 7, 50 and a state in which the hydraulic pressure in the hydraulic paths 37, 50 is released are connected to the switching control valves 60, 61. The switching operation of 61 is controlled by control means 62.
Is controlled by The control means 62 releases the hydraulic pressure of the hydraulic passages 37 and 50 in the low-speed operation range of the engine and releases the hydraulic pressure from the hydraulic pump 59 to the hydraulic passage 37 in the medium-speed operation range of the engine. But the hydraulic pressure in the hydraulic passage 50 is released, and in the high-speed operation range of the engine, both hydraulic passages 3
The switching operation of the two switching control valves 60 and 61 is controlled so that the hydraulic pressure from the hydraulic pump 59 acts on the switches 7 and 50 together.

【0024】次にこの第1参考例の作用について説明す
ると,機関の低速運転域では高速用連結分離手段301
における油圧室49ならびに連結分離手段311 におけ
る油圧室36の油圧は解放されている。これにより,高
速用連結分離手段301 にあっては両連結ピン42,4
5が戻しばね44,47のばね力により油圧室49側に
最大限移動しており,連結ピン42および規制部材43
の当接面は第1および第2ロッカアーム22,23間に
在り,連結ピン45および規制部材46の当接面は第2
および第3ロッカアーム23,24間に在る。また連結
分離手段311にあっては,連結ピン32が戻しばね3
4のばね力により油圧室36側に最大限移動しており,
連結ピン32および規制部材33の当接面は第2および
第3ロッカアーム23,24間に在る。したがって第1
〜第3ロッカアーム22,23,24は相対角変位可能
な状態にある。
Next, to explain the action of the first reference example, the high-speed connecting and separating means in the low-speed operating range of the engine 30 1
Hydraulic pressure in the hydraulic pressure chamber 36 is released in the hydraulic chamber 49 and the connecting and separating means 31 1 in. Thus, both the connecting pin is a high speed for connecting and separating means 30 1 42,4
5 is moved to the hydraulic chamber 49 side by the spring force of the return springs 44 and 47 to the maximum extent.
Is located between the first and second rocker arms 22 and 23, and the contact surface of the connecting pin 45 and the regulating member 46 is the second contact surface.
And between the third rocker arms 23 and 24. Also In the connecting and separating means 31 1, the connecting pin 32 is the return spring 3
By the spring force of 4, it has moved to the maximum to the hydraulic chamber 36 side,
The contact surface between the connecting pin 32 and the regulating member 33 is located between the second and third rocker arms 23 and 24. Therefore the first
-The third rocker arms 22, 23, 24 are in a state where relative angular displacement is possible.

【0025】このような高速用連結分離手段301 およ
び連結分離手段311 の連結解除状態にあっては,カム
シャフト17の回転作動により第2ロッカアーム23は
第2カム20により揺動駆動され,一方の吸気弁V1
第2カム20のプロフィルに応じたタイミングおよびリ
フト量で開閉作動する。また第3カム21に摺接した第
3ロッカアーム24はその揺動作動を実質的に休止させ
た状態となり,他方の吸気弁V2 を実質的に閉弁休止さ
せることができる。しかも第3カム21にはわずかに突
出した高位部21bが第2カム20の高位部20bに対
応して設けられているので,吸気弁V2 は完全に閉弁休
止するのではなく,一方の吸気弁V1 が開弁するときに
は開弁方向にわずかに作動するので,完全な閉弁状態を
保ったときに生じる吸気弁V2 の弁座への固着を防止す
ることができる。さらに第1ロッカアーム22は第1カ
ム19との摺接に応じて揺動するが,その揺動動作は第
2および第3ロッカアーム23,24に何らの影響も及
ぼさない。
[0025] In the connection release state of such high-speed connecting and separating means 30 1 and the connecting and separating means 31 1, the second rocker arm 23 is swung by the second cam 20 by the rotation operation of the cam shaft 17, One intake valve V 1 opens and closes at a timing and a lift according to the profile of the second cam 20. The third rocker arm 24 in sliding contact with the third cam 21 is in a state in which substantially rested its swung, it is possible to substantially closed resting the other intake valve V 2. Moreover, since the higher portion 21b which protrudes slightly in the third cam 21 is provided corresponding to the higher portion 20b of the second cam 20, the intake valve V 2 is completely rather than closed rest, of one since the intake valve V 1 is slightly operated in the opening direction when the valve opening, it is possible to prevent sticking to the valve seat of the intake valve V 2 occurring when maintaining a fully closed state. Further, the first rocker arm 22 swings in accordance with the sliding contact with the first cam 19, but the swinging operation does not affect the second and third rocker arms 23 and 24 at all.

【0026】機関の中速運転域においては,高速用連結
分離手段301 は油圧室49の油圧が解放されたままで
連結解除状態にあるが,連結分離手段311 の油圧室3
6には油圧ポンプ59からの油圧が作用せしめられる。
これにより連結分離手段311 では,連結ピン32が戻
しばね34のばね力に抗して第3ロッカアーム24のガ
イド穴39に嵌合し,第2および第3ロッカアーム2
3,24が連結されることになる。
[0026] In the medium-speed operating range of the engine, the high-speed connecting and separating means 30 1 is in the decoupled state while the hydraulic pressure in the hydraulic pressure chamber 49 is released, but the connecting and separating means 31 1 of the hydraulic chamber 3
The hydraulic pressure from the hydraulic pump 59 is applied to 6.
As a result, in the connecting / separating means 31 1 , the connecting pin 32 is fitted into the guide hole 39 of the third rocker arm 24 against the spring force of the return spring 34, and the second and third rocker arms 2
3, 24 will be connected.

【0027】このように第2および第3ロッカアーム2
3,24が連結されると,第2カム20に摺接している
第2ロッカアーム23とともに第3ロッカアーム24が
揺動し,両吸気弁V1 ,V2 は第2カム20のプロフィ
ルに応じたタイミングおよびリフト量で開閉作動せしめ
られる。
Thus, the second and third rocker arms 2
When the third rocker arm 3 and the second cam 20 are connected to each other, the third rocker arm 24 swings together with the second rocker arm 23 slidingly contacting the second cam 20, and the intake valves V 1 and V 2 correspond to the profile of the second cam 20. It can be opened and closed by the timing and lift amount.

【0028】この際,連結分離手段311 は相互に隣接
する第2および第3ロッカアーム23,24を連結する
ものであるので,相互間に存在する他のロッカアームを
跨いで連結するようにした従来のものと比べると連結剛
性を比較的高くすることが可能である。また第2カム2
0から第2ロッカアーム23への駆動力作用点から両吸
気弁V1 ,V2 までの距離はほぼ等距離に設定されてい
るので,第2カム20からの駆動荷重をほぼ均等に分配
して両吸気弁V1 ,V2 に作用させることができ,偏荷
重が生じることを回避することができ,第2カム20へ
のカムスリッパ27の片当たりを防止し,第2カム20
およびカムスリッパ27の摺接面の偏摩耗を防止するこ
とができる。
[0028] At this time, the connecting and separating means 31 1 Since those connecting the second and third rocker arms 23, 24 adjacent to each other, the conventional which is adapted to couple across the other rocker arm existing between each other It is possible to make the connection rigidity relatively high as compared with that of the above. Second cam 2
Since the distance from the point of application of the driving force from 0 to the second rocker arm 23 to the two intake valves V 1 and V 2 is set to be substantially equal, the driving load from the second cam 20 is distributed almost evenly. It can act on both intake valves V 1 and V 2 , can avoid the occurrence of an eccentric load, prevent the cam slipper 27 from coming into contact with the second cam 20, and prevent the second cam 20.
In addition, uneven wear of the sliding surface of the cam slipper 27 can be prevented.

【0029】機関の高速運転域では,高速用連結分離手
段301 における油圧室49ならびに連結分離手段31
1 における油圧室36に油圧ポンプ59からの油圧がと
もに作用せしめられる。これにより高速用連結分離手段
301 では,連結ピン42がガイド穴52に嵌合して第
1および第2ロッカアーム22,23間が連結されると
ともに,連結ピン45がガイド穴56に嵌合して第2お
よび第3ロッカアーム23,24間が連結され,高速用
連結分離手段301 により全てのロッカアーム22〜2
4が連結された状態となる。
[0029] In the high-speed operating range of the engine, the hydraulic chamber 49 and the connecting and separating means at a high speed for connecting and separating means 30 1 31
The hydraulic pressure from the hydraulic pump 59 is applied to the hydraulic chamber 36 at 1 . Thus, in the high-speed connecting and separating means 30 1, with between the first and second rocker arms 22, 23 connecting pin 42 is fitted in the guide hole 52 is connected, the connecting pin 45 is fitted into the guide hole 56 during the second and third rocker arms 23, 24 are connected Te, all of the rocker arm by the high-speed connecting and separating means 30 1 22-2
4 are connected.

【0030】第1〜第3ロッカアーム22〜24が全て
連結されると,吸気弁V1 ,V2 に連動,連結されてい
る第2および第3ロッカアーム23,24は,第1カム
19で揺動駆動される第1ロッカアーム22とともに揺
動することになり,両吸気弁V1 ,V2 は,第1カム1
9のプロフィルに応じたタイミングおよびリフト量で開
閉作動せしめられる。
When all of the first to third rocker arms 22 to 24 are connected, the second and third rocker arms 23 and 24 connected to and linked to the intake valves V 1 and V 2 swing by the first cam 19. It swings with the first rocker arm 22 that is driven and driven, and the two intake valves V 1 and V 2
The opening and closing operation is performed at a timing and a lift amount according to the profile of No. 9.

【0031】このような動弁装置において,機関の高速
運転域にあっては,高速用連結分離手段301 によって
全てのロッカアーム22〜24が連結されるだけでな
く,連結分離手段311 によって第2および第3ロッカ
アーム23,24が連結されているので,連結剛性を高
めることができる。
[0031] In such a valve operating system, in the high speed operating range of the engine, not only all the rocker arms 22 to 24 are connected by a high-speed connecting and separating means 30 1, by connecting and separating means 31 1 second Since the second and third rocker arms 23 and 24 are connected, the connection rigidity can be increased.

【0032】しかも高速用連結分離手段301 および連
結分離手段311 は,ロッカアームシャフト25の軸線
まわりにずれた位置に配設されるものであるので,複数
の連結分離手段301 ,311 が配設されているにもか
かわらず,ロッカアームシャフト25の軸線に沿う各ロ
ッカアーム22〜24の幅を大きくすることなしに,両
連結分離手段301 ,311 で充分な作動ストロークを
得ることができる。
[0032] Moreover the connecting and separating means 30 1 and the connecting and separating means 31 1 for high speed, since it is intended to be disposed at a position displaced about the axis of the rocker arm shaft 25, a plurality of connecting and separating means 30 1, 31 1 despite being disposed, can be obtained without increasing the width of the rocker arms 22 to 24 along the axis of the rocker arm shaft 25, a sufficient working stroke in both connecting and separating means 30 1, 31 1 .

【0033】また機関の中速運転域および高速運転域で
連結状態となる連結分離手段311が,ロッカアームシ
ャフト25の軸線と第2および第3カム20,21との
間で第2および第3ロッカアーム23,24に設けられ
るので,第2カム20からの駆動力作用点の近傍で第2
および第3ロッカアーム23,24が連結されることに
なり,連結剛性をより高めることが可能となる。
Further connecting and separating means 31 1 to become a consolidated state in the medium-speed operating range and the high-speed operating range of the engine, second and third in between the axis and the second and third cam 20, 21 of the rocker arm shaft 25 Since it is provided on the rocker arms 23 and 24, the second
And the third rocker arms 23 and 24 are connected, so that the connection rigidity can be further increased.

【0034】ところで,機関の高速運転域で全てのロッ
カアーム22〜24を連結状態としたときには,各ロッ
カアーム22〜24の配列方向に沿う一端側に在る第1
ロッカアーム22によって,吸気弁V1 ,V2 にそれぞ
れ連動,連結された第2および第3ロッカアーム23,
24が揺動駆動されることになるので,各ロッカアーム
22〜24には,第1カム19から第1ロッカアーム2
2への駆動力作用点の近傍に在る連結分離手段311
軸線とロッカアームシャフト25の軸線とを通る仮想平
面63(図1参照)内でロッカアームシャフト25の軸
線に対してねじれる方向の荷重が作用し,そのねじれが
生じたときには,第1ロッカアーム22のカムスリッパ
26と第1カム19との摺接面に,片当たりによる偏摩
耗が生じる。しかるに,高速用連結分離手段301 は,
ロッカアームシャフト25の軸線のまわりに連結分離手
段311 とは周方向にほぼ90度の角度αだけずれた位
置でロッカアーム22〜24に設けられるので,高速用
連結分離手段301 が連結状態となることにより上記ね
じれに対する剛性が高められることになり,カムスリッ
パ26と第1カム19との摺接面に偏荷重が生じること
が極力防止される。
By the way, when all the rocker arms 22 to 24 are connected in the high-speed operation range of the engine, the first rocker arm 22 to 24 located at one end along the direction of arrangement is arranged.
The second and third rocker arms 23, 23 interlocked and connected to the intake valves V 1 and V 2 respectively by the rocker arm 22.
24 is oscillated, each rocker arm 22 to 24 is provided with the first rocker arm 2 from the first cam 19.
Direction load of twisting with respect to the virtual plane 63 the axis of the rocker arm shaft 25 in a (see FIG. 1) passing through the axis of the connecting and separating means 31 first axis and the rocker arm shaft 25 located in the vicinity of the driving force acting point of the 2 When the torsion occurs, uneven wear occurs due to a single contact on the sliding contact surface between the cam slipper 26 of the first rocker arm 22 and the first cam 19. However, high-speed connecting and separating means 30 1,
Since the connecting and separating means 31 1 about the axis of the rocker arm shaft 25 is provided on the rocker arm 22 to 24 at a position shifted by an angle α of approximately 90 degrees in the circumferential direction, connecting and separating means 30 1 is in the connection mode for high-speed As a result, the rigidity against the torsion is enhanced, and the occurrence of an uneven load on the sliding contact surface between the cam slipper 26 and the first cam 19 is prevented as much as possible.

【0035】図5は第1参考例の変形例を示すものであ
り,図1〜図4の第1参考例に対応する部分には同一の
参照符号を付す。
[0035] FIG. 5 shows a modification of the first reference example, the parts corresponding to the first reference example of FIGS. 1-4 are denoted by the same reference numerals.

【0036】機関の高速運転域で全てのロッカアーム2
2〜24を連結可能な高速用連結分離手段302 は,第
1および第2ロッカアーム22,24の連結および連結
解除を切換可能な第1連結分離機構64と,第2および
第3ロッカアーム23,24の連結および連結解除を第
1連結分離機構64とは独立して切換可能な第2連結分
離機構65とから成る。
In the high speed operation range of the engine, all rocker arms 2
High speed connecting and separating means 30 2 connectable 2 to 24 includes a first connecting and separating mechanism 64 that can switch connection and uncoupling of the first and second rocker arms 22 and 24, second and third rocker arms 23, The second connection / separation mechanism 65 can switch the connection / disconnection of the 24 independently of the first connection / separation mechanism 64.

【0037】第1連結分離機構64は,第1および第2
ロッカアーム22,23を連結可能な連結ピン42と,
該連結ピン42の移動を規制する規制部材43と,連結
ピン42および規制部材43を連結解除側に付勢する戻
しばね44とを備え,また第2連結分離機構65は,第
2および第3ロッカアーム23,24を連結可能な連結
ピン45と,連結ピン45の移動を規制する規制部材4
6と,連結ピン45および規制部材46を連結解除側に
付勢する戻しばね47とを備える。
The first connection / separation mechanism 64 includes first and second
A connecting pin 42 capable of connecting the rocker arms 22 and 23,
The connecting member 42 includes a regulating member 43 for regulating the movement of the connecting pin 42, and a return spring 44 for urging the connecting pin 42 and the regulating member 43 to the uncoupling side. A connecting pin 45 for connecting the rocker arms 23 and 24, and a regulating member 4 for regulating the movement of the connecting pin 45;
6 and a return spring 47 for urging the connection pin 45 and the regulating member 46 toward the connection release side.

【0038】第2ロッカアーム23には,第1ロッカア
ーム22側に開放した有底のガイド穴481 がロッカア
ームシャフト25と平行に穿設されており,連結ピン4
2はガイド穴481 の閉塞端との間に油圧室491 を形
成してガイド穴481 に摺動可能に嵌合される。またロ
ッカアームシャフト25内には,連結切換手段31
1(図3参照)の油圧路37とは隔絶された油圧路50
1 が設けられており,第2ロッカアーム23およびロッ
カアームシャフト25には,第2ロッカアーム23の揺
動状態にかかわらず油圧室491 を油圧路501 に連通
させる連通路511が設けられる。
[0038] The second rocker arm 23, the guide hole 48 1 of the bottom that is open to the side first rocker arm 22 is parallel to drilled the rocker arm shaft 25, connecting pin 4
2 to form a hydraulic chamber 49 1 is slidably fitted in the guide holes 48 1 between the closed end of the guide hole 48 1. In the rocker arm shaft 25, a connection switching means 31 is provided.
1 (see FIG. 3), a hydraulic path 50 isolated from the hydraulic path 37
1 is provided, on the second rocker arm 23 and the rocker arm shaft 25, the communication passage 51 1 for communicating is provided a hydraulic chamber 49 1 regardless swing state of the second rocker arm 23 to the hydraulic passage 50 1.

【0039】また第2ロッカアーム23には,第3ロッ
カアーム24側に開放した有底のガイド穴482 が前記
ガイド穴481 と同軸上に穿設されており,連結ピン4
5はガイド穴482 の閉塞端との間に油圧室492 を形
成してガイド穴482 に摺動可能に嵌合される。またロ
ッカアームシャフト25内には,前記連結切換手段31
1 の油圧路37と隔絶されるとともに前記油圧路501
とは隔壁部材66で隔絶された油圧路502 が設けられ
ており,第2ロッカアーム23およびロッカアームシャ
フト25には,第2ロッカアーム23の揺動状態にかか
わらず油圧室492 を油圧路502 に連通させる連通路
512 が設けられる。
Further to the second rocker arm 23 is a third rocker arm 24 of the open bottom on the side guide hole 48 2 is formed in the guide hole 48 1 coaxially connecting pin 4
5 to form a hydraulic chamber 49 2 is slidably fitted in the guide holes 48 2 between the closed end of the guide hole 48 2. In the rocker arm shaft 25, the connection switching means 31 is provided.
1 and the hydraulic path 50 1
And has hydraulic passage 50 2 that is isolated is provided in the partition wall member 66, the second rocker arm 23 and the rocker arm shaft 25, the hydraulic chamber 49 2 hydraulic passage 50 2 regardless swing state of the second rocker arm 23 communicating passage 51 2 which communicates is provided.

【0040】ロッカアームシャフト25内に形成されて
いる油圧路37,501 ,502 は,それらの油圧路3
7,501 ,502 に油圧ポンプ59からの油圧を作用
させる状態,ならびに油圧路37,501 ,502 の油
圧を解放する状態を切換可能な切換制御弁60,6
1 ,612 が接続されており,それらの切換制御弁6
0,611 ,612 の切換作動は制御手段62により制
御される。而して該制御手段62は,機関の運転状態に
応じて,油圧路37,501 ,502 の油圧を全て解放
する状態と,油圧路37のみに油圧ポンプ59からの油
圧を作用させる状態と,油圧路501 のみに油圧を作用
させる状態と,全ての油圧路37,501 ,502 に油
圧ポンプ59からの油圧を作用させる状態とを切換え
て,各切換制御弁60,611 ,612 の切換作動を制
御するものである。
The hydraulic paths 37, 50 1 , and 50 2 formed in the rocker arm shaft 25 correspond to the hydraulic paths 3
Switching control valves 60, 6 capable of switching between a state in which hydraulic pressure from hydraulic pump 59 acts on 7, 50 1 , 50 2 and a state in which hydraulic pressures in hydraulic paths 37, 50 1 , 50 2 are released.
1 1, 61 2 are connected, their switching control valve 6
0,61 1, 61 2 of the switching operation is controlled by the control means 62. Condition Thus the control means 62 and, depending on the operating state of the engine, to act and a state to release all the hydraulic path 37,50 1, 50 2 of the hydraulic, the hydraulic pressure from the hydraulic pump 59 only to the hydraulic passage 37 When, by switching between a state in which the action of hydraulic pressure only to the hydraulic passage 50 1, and a state for applying a hydraulic pressure from all of the hydraulic path 37,50 1, 50 2 to the hydraulic pump 59, the switching control valve 60, 61 1 and controls the switching operation of the 61 2.

【0041】この変形例によると,第1〜第3ロッカア
ーム22〜24の連結を解除して吸気弁V1 の開閉作動
特性を第2カム20のプロフィルに応じたものとすると
ともに吸気弁V2 を第3カム21のプロフィルに応じた
ものとする状態と,第2および第3ロッカアーム23,
24を連結して両吸気弁V1 ,V2 の開閉作動特性を第
2カム20のプロフィルに応じたものとする状態と,第
1および第2ロッカアーム21,22を連結して吸気弁
1 の開閉作動特性を第1カム19のプロフィルに応じ
たものとするとともに吸気弁V2 の開閉作動特性を第3
カム21のプロフィルに応じたものとする状態と,全て
のロッカアーム22〜24を連結して両吸気弁V1 ,V
2 の開閉作動特性を第1カム19のプロフィルに応じた
ものとする状態とを切換可能となり,弁作動特性の選択
の自由度をより増大させることができる。
According to this modification, the connection of the first to third rocker arms 22 to 24 is released to make the opening / closing operation characteristic of the intake valve V 1 according to the profile of the second cam 20 and the intake valve V 2 In accordance with the profile of the third cam 21 and the second and third rocker arms 23,
24 and the opening and closing operation characteristics of both intake valves V 1 and V 2 according to the profile of the second cam 20, and the first and second rocker arms 21 and 22 are connected to connect the intake valve V 1 the third opening and closing operation characteristics of the intake valves V 2 as well as one corresponding opening and closing operating characteristics of the profile of the first cam 19
A state according to the profile of the cam 21 and a state where all the rocker arms 22 to 24 are connected to connect the two intake valves V 1 , V
The second opening and closing characteristic switchable between it and a state that one corresponding to the profile of the first cam 19 can be increased more freedom of choice of the valve operating characteristic.

【0042】図6ないし図9は本発明の第2参考例を示
すものであり,図6は縦断面図であって図7の6−6線
に沿う断面図,図7は図6の7−7線に沿う拡大平面
図,図8は図6の8−8線拡大断面図,図9は図6の9
−9線拡大断面図であり,上記第1参考例に対応する部
分には同一の参照符号を付す。
[0042] Figure 6 to 9 show a second exemplary embodiment of the present invention, FIG. 6 is a sectional view along line 6-6 in FIG. 7 a longitudinal sectional view, 7 of FIG. 7 6 8 is an enlarged plan view taken along line -7, FIG. 8 is an enlarged sectional view taken along line 8-8 in FIG. 6, and FIG.
FIG. 10 is an enlarged sectional view taken along line -9, and the same reference numerals are given to portions corresponding to the first reference example.

【0043】先ず図6および図7において,第1〜第3
ロッカアーム22〜24には,機関の高速運転域で全て
のロッカアーム22〜24を連結可能な高速用連結分離
手段303 が設けられ,第1〜第3ロッカアーム22〜
24のうち吸気弁V1 ,V2がそれぞれ連動,連結され
て相互に隣接した第2および第3ロッカアーム23,2
4には,両者23,24の連結および連結解除を高速用
連結分離手段303 とは独立して切換可能な連結分離手
段312 が設けられる。しかも図6で示すように,高速
用連結分離手段303 が,各ロッカアーム22〜24の
揺動軸線すなわちロッカアームシャフト25の軸線とカ
ム19〜21との間で第1〜第3ロッカアーム22〜2
4に設けられるのに対し,連結分離手段312 はロッカ
アームシャフト25の軸線のまわりに高速用連結分離手
段303 とは周方向にほぼ90度をなす角度αだけずれ
た位置で第2および第3ロッカアーム23,24に設け
られる。
First, in FIGS. 6 and 7, first to third
The rocker arm 22 to 24, all the rocker arms 22 to 24 high-speed connecting and separating means 30 3 connectable to provided a high-speed operating range of the engine, first through third rocker arms 22 to
24, the intake valves V 1 and V 2 are interlocked and connected to each other, and the second and third rocker arms 23 and 2 are adjacent to each other.
The 4, switchable connecting and separating means 31 2 is provided independently of the high speed connection separation means 30 3 coupling and uncoupling of both 23 and 24. Moreover, as shown in Figure 6, the high-speed connecting and separating means 30 3, the first through third rocker arm between the axis and the cam 19 to 21 of the swing axis i.e. the rocker arm shaft 25 of the rocker arms 22 to 24 22-2
While it provided 4, connecting and separating means 31 2 second and at a position angle α deviation constituting substantially 90 degrees in the circumferential direction with the high speed connection separation means 30 3 about the axis of the rocker arm shaft 25 Three rocker arms 23 and 24 are provided.

【0044】図8において,高速用連結分離手段303
は,第3および第2ロッカアーム24,23を連結可能
な連結ピン68と,第2および第1ロッカアーム23,
22を連結可能な連結ピン69と,連結ピン68,69
の移動を規制する規制部材70と,連結ピン68,69
および規制部材70を連結解除側に付勢する戻しばね7
1とを備える。
In FIG. 8, the high-speed connection / separation means 30 3
A connecting pin 68 for connecting the third and second rocker arms 24 and 23, and a connecting pin 68 for connecting the second and first rocker arms 23 and 23;
A connecting pin 69 capable of connecting the connecting pins 22;
And a connecting pin 68, 69
Spring 7 for urging the regulating member 70 toward the connection release side
1 is provided.

【0045】第3ロッカアーム24には,第2ロッカア
ーム23側に開放した有底のガイド穴72がロッカアー
ムシャフト25と平行に穿設され,連結ピン68はガイ
ド穴72に摺動可能に嵌合される。しかもガイド穴72
の閉塞端および連結ピン68間には油圧室73が形成さ
れ,この油圧室73は,第3ロッカアーム24およびロ
ッカアームシャフト25に設けられる連通路74を介し
て,ロッカアームシャフト25内の油圧路50に常時連
通せしめられる。
The third rocker arm 24 is provided with a bottomed guide hole 72 opened to the second rocker arm 23 side in parallel with the rocker arm shaft 25, and the connecting pin 68 is slidably fitted in the guide hole 72. You. Moreover, the guide hole 72
A hydraulic chamber 73 is formed between the closed end of the locker arm and the connecting pin 68, and the hydraulic chamber 73 is connected to a hydraulic path 50 in the rocker arm shaft 25 through a communication path 74 provided in the third rocker arm 24 and the rocker arm shaft 25. You can always communicate.

【0046】第2ロッカアーム23には,前記ガイド穴
72に対応するガイド孔75が両端を開放させてロッカ
アームシャフト25と平行に設けられ,一端を前記連結
ピン68に摺接させた連結ピン69がガイド孔75に摺
動可能に嵌合される。
A guide hole 75 corresponding to the guide hole 72 is provided in the second rocker arm 23 in parallel with the rocker arm shaft 25 with both ends opened, and a connecting pin 69 having one end slidably in contact with the connecting pin 68 is provided. It is slidably fitted in the guide hole 75.

【0047】第1ロッカアーム22には,前記ガイド孔
75に対応するガイド孔76がロッカアームシャフト2
5と平行に穿設されており,連結ピン69に摺接する有
底円筒状の規制部材70がガイド孔76に摺動可能に嵌
合される。このガイド孔76の中間部には規制部材70
に当接して該規制部材70の移動端を規制する規制段部
76aが設けられており,戻しばね71は,ガイド孔7
6の内面に嵌着された止め輪77と規制部材70との間
に縮設される。
A guide hole 76 corresponding to the guide hole 75 is formed in the first rocker arm 22.
A cylindrical regulating member 70 having a bottom and slidably contacting the connecting pin 69 is slidably fitted in the guide hole 76. A regulating member 70 is provided at an intermediate portion of the guide hole 76.
A restricting step 76a is provided for restricting the moving end of the restricting member 70 by abutting against the guide hole 7a.
6 is contracted between the retaining ring 77 fitted on the inner surface of the inner ring 6 and the regulating member 70.

【0048】図9において,連結分離手段312 は,第
3および第2ロッカアーム24,23を連結可能な連結
ピン80と,連結ピン80の移動を規制する規制部材8
1と,連結ピン80および規制部材81を連結解除側に
付勢する戻しばね82とを備える。
[0048] In FIG. 9, the connecting and separating means 31 2 includes a connecting pin 80 capable of connecting the third and second rocker arms 24 and 23, regulating member 8 for regulating the movement of the connecting pin 80
1 and a return spring 82 for urging the connecting pin 80 and the regulating member 81 to the uncoupling side.

【0049】第3ロッカアーム24には,第2ロッカア
ーム24側に開放した有底のガイド穴83がロッカアー
ムシャフト25と平行に穿設されており,このガイド穴
83に連結ピン80が摺動可能に嵌合され,連結ピン8
0の一端とガイド穴83の閉塞端との間に油圧室84が
画成される。また第3ロッカアーム23およびロッカア
ームシャフト25には,油圧室84をロッカアームシャ
フト25内の油圧路37に常時連通せしめる連通路85
が設けられる。
The third rocker arm 24 is provided with a bottomed guide hole 83 opened to the second rocker arm 24 side in parallel with the rocker arm shaft 25, and a connecting pin 80 is slidable in the guide hole 83. Mating, connecting pin 8
Hydraulic chamber 84 is defined between one end of O and the closed end of guide hole 83. The third rocker arm 23 and the rocker arm shaft 25 are provided with a communication passage 85 for allowing the hydraulic chamber 84 to always communicate with the hydraulic passage 37 in the rocker arm shaft 25.
Is provided.

【0050】第2ロッカアーム23には,前記ガイド孔
83に対応するガイド孔86がロッカアームシャフト2
5と平行に穿設されており,連結ピン80に摺接する有
底円筒状の規制部材81がガイド孔86に摺動可能に嵌
合される。このガイド孔86の中間部には規制部材81
に当接して該規制部材81の移動端を規制する規制段部
86aが設けられており,戻しばね82は,ガイド孔8
6の内面に嵌着された止め輪87と規制部材81との間
に縮設される。
A guide hole 86 corresponding to the guide hole 83 is formed in the second rocker arm 23.
5, a cylindrical regulating member 81 having a bottom and slidingly in contact with the connecting pin 80 is slidably fitted in the guide hole 86. A regulating member 81 is provided at an intermediate portion of the guide hole 86.
A restricting step 86a is provided for restricting the moving end of the restricting member 81 by contact with the guide hole 8a.
6 is contracted between the retaining ring 87 fitted on the inner surface of the inner ring 6 and the regulating member 81.

【0051】この第2参考例によっても機関の低速運転
域において連結分離手段312 および高速用連結分離手
段303 を連結解除状態とし,機関の中速運転域におい
て連結分離手段312 を連結状態とするが高速用連結分
離手段303 を連結解除状態とし,機関の高速運転域で
連結分離手段312 および高速用連結分離手段303
共に連結作動せしめることにより,上記第1参考例と同
様の効果を奏することができる。
[0051] The second reference example as well the connecting and separating means 31 2 and the high-speed connecting and separating means 30 3 and the connecting release state in the low speed operating range of the engine, connecting state coupling separating means 31 2 in the medium-speed operating range of the engine Although the the uncoupled state connecting and separating means 30 3 for high speed, by allowed to both operatively connected to connecting and separating means 31 2 and the high-speed connecting and separating means 30 3 in the high-speed operating range of the engine, similarly to the first reference example The effect can be achieved.

【0052】次に図10を参照して本発明の実施例を説
明する。この実施例は,第2参考例をベースとしている
ので,これとの相違点だけを次に説明する。即ち,この
実施例では,各ロッカアーム22〜24に対応するカ
ム19〜21に転がり接触するローラ88…をそれぞれ
軸支し,それらのローラ88…内に同軸に収納されるよ
うにして高速用連結分離手段303 を各ロッカアーム2
2〜24に配設するようにしている。これにより,各ロ
ッカアーム22〜24と対応するカム19〜21との間
の摩擦力が低減されて,動弁駆動力の低減に寄与するこ
とができる。
Next, an embodiment of the present invention will be described with reference to FIG.
I will tell. This embodiment is based on the second reference example.
Therefore, only the differences will be described below. That is, this
In this embodiment, rollers 88... That are in rolling contact with the corresponding cams 19 to 21 are respectively supported on the rocker arms 22 to 24, and are accommodated coaxially in the rollers 88. 30 3 to each rocker arm 2
2 to 24 are arranged . Thus, the frictional force is reduced between the corresponding cam 19 to 21 and the rocker arms 22 to 24, Ru can contribute to the reduction of the valve driving force.

【0053】以上,本発明の実施例を詳述したが,本発
明は上記実施例に限定されるものではなく,特許請求の
範囲に記載された本発明を逸脱することなく種々の設計
変更を行なうことが可能である。
Although the embodiments of the present invention have been described in detail, the present invention is not limited to the above embodiments, and various design changes can be made without departing from the present invention described in the appended claims. It is possible to do.

【0054】たとえば第2および第3カム22,23の
位置を入れ換えるようにしてもよく,また第3カム23
として吸気弁を実質的に作動させるプロフィルのものを
用いることもできる。さらに本発明を排気弁の動弁装置
に適用することも可能である。
For example, the positions of the second and third cams 22 and 23 may be interchanged.
A profile having a profile that substantially operates the intake valve may be used. Further, the present invention can be applied to a valve gear of an exhaust valve.

【0055】[0055]

【発明の効果】以上のように発明によれば,複数のカ
ムは,それらのカムのうち機関の高速運転に対応したプ
ロフィルのカムをカムシャフトの軸線に沿う外側に配置
してカムシャフトに設けられ,機関の高速運転域で全て
のカムフォロアを連結する状態ならびに前記高速運転域
以外で連結を解除する状態を切換可能な高速用連結分離
手段と,機関弁に連動,連結されたカムフォロアへの他
のカムフォロアの連結および連結解除を切換可能な1あ
るいは複数の連結分離手段とが,揺動支軸の周方向に相
互に異なる位置でカムフォロアに配設されるので,弁作
動特性の選択の自由度を増大させることができるととも
に,機関の高速運転域以外での連結分離手段によるカム
フォロアの連結時に連結剛性を高めることができ,また
複数の連結分離手段を各カムフォロアの揺動支軸まわり
にずらせることにより前記揺動支軸に沿うカムフォロア
全体の幅を小さくすることを可能として小型化に寄与す
ることができる。また上記全ての連結分離手段が,揺動
支軸の軸方向一端外方より見て,機関弁に連動,連結さ
れたカムフォロアの機関弁側の端部と揺動支軸との間を
避けた位置に配設されるので,機関弁上端部の周辺にお
いて弁ばね支持用リテーナ等の部品を配置するスペース
を,連結分離手段に影響されずに十分に確保可能となっ
て,相隣なるカムフォロア相互間のリフト量の設定自由
度を高めることができ,しかもカムフォロアの,連結分
離手段を保持する部分を上記リテーナ等の部品より離隔
させることができて,該部分の必要な肉厚を上記リテー
ナ等に影響されずに確保できるから,カムフォロアの変
形防止に効果的であって,連結分離手段の切換作動の信
頼性向上に寄与することができる。
As described above, according to the present invention, among the plurality of cams, a cam having a profile corresponding to a high-speed operation of the engine is disposed outside the camshaft along the axis of the camshaft. A high-speed connection / separation means for switching between a state in which all the cam followers are connected in a high-speed operation range of the engine and a state in which the connection is released in other than the high-speed operation range; Since one or a plurality of connection / separation means capable of switching connection / disconnection of another cam follower are disposed on the cam follower at positions different from each other in the circumferential direction of the swing support shaft, the valve operating characteristics can be freely selected. The connection rigidity can be increased when the cam follower is connected by the connection / separation means outside the high-speed operation range of the engine, and the connection / disconnection mechanism can be increased. Can the contributing to downsizing as possible to reduce the width of the entire cam follower along the swing shaft by causing shifting around the swing shaft of the cam followers. In addition, all of the above connection and separation means are interlocked with the engine valve as viewed from the outside of one end in the axial direction of the swing support shaft, to avoid a gap between the end of the connected cam follower on the engine valve side and the swing support shaft. Since it is arranged at the position, the space for disposing the parts such as the retainer for supporting the valve spring around the upper end of the engine valve can be sufficiently secured without being affected by the connection / separation means. It is possible to increase the degree of freedom of setting the lift amount between them, and furthermore, the part of the cam follower holding the connecting and separating means can be separated from the above-mentioned parts such as the retainer. Therefore, it is effective in preventing deformation of the cam follower, and can contribute to improvement in reliability of the switching operation of the connection / separation means.

【0056】また特にカムシャフトは,揺動支軸よりも
下方に配設され,高速用連結分離手段は,カムシャフト
に設けたカムの直上に配設されると共に,該揺動支軸か
ら見て機関弁とは反対側に配置され,該高速用連結分離
手段の連結ピンと同軸に配置されて各カムフォロアに対
応するカムに転がり接触するローラが該各カムフォロア
に軸支されるので,揺動支軸よりも下方に配設されるカ
ムシャフトの上方スペースを有効に利用して高速用連結
分離手段及びローラを無理なく配設できるため,動弁機
構の高さ方向の小型化に寄与することができ,さらにカ
ムフォロアの,高速用連結分離手段を保持する部分の肉
厚を十分に確保できて該部分の変形防止に効果的である
から,高速用連結分離手段の切換作動の信頼性向上に寄
与することができる。
[0056] Further mosquitoes especially Mushafuto is arranged below the rocking shaft, the high speed connection separation means and is arranged immediately above the cam provided on the camshaft, the swing support shaft When viewed from the opposite side of the engine valve, the roller which is disposed coaxially with the connecting pin of the high-speed connecting / separating means and is in rolling contact with the cam corresponding to each cam follower is pivotally supported by each cam follower. The high-speed connection / separation means and rollers can be arranged without difficulty by effectively utilizing the space above the camshaft arranged below the support shaft, contributing to downsizing of the valve operating mechanism in the height direction. In addition, the thickness of the portion of the cam follower that holds the high-speed connection / separation means can be sufficiently ensured, which is effective in preventing deformation of the portion. Therefore, the reliability of the switching operation of the high-speed connection / separation means can be improved. It can contribute to .

【図面の簡単な説明】[Brief description of the drawings]

【図1】第1参考例の動弁装置の縦断面図であって図2
の1−1線に沿う断面図
FIG. 1 is a longitudinal sectional view of a valve gear according to a first reference example, and FIG.
Sectional view along line 1-1

【図2】図1の2矢視拡大平面図FIG. 2 is an enlarged plan view of FIG.

【図3】図1の3−3線拡大断面図FIG. 3 is an enlarged sectional view taken along line 3-3 in FIG. 1;

【図4】図1の4−4線拡大断面図FIG. 4 is an enlarged sectional view taken along line 4-4 of FIG. 1;

【図5】第1参考例の変形例の図4に対応する縦断面図FIG. 5 is a longitudinal sectional view corresponding to FIG. 4 of a modification of the first reference example;

【図6】第2参考例の動弁装置の縦断面図であって図7
の6−6線に沿う断面図
6 is a longitudinal sectional view of a valve gear according to a second reference example, and FIG.
Sectional view along line 6-6

【図7】図6の7矢視拡大平面図FIG. 7 is an enlarged plan view as viewed in the direction of arrow 7 in FIG. 6;

【図8】図6の8−8線拡大断面図8 is an enlarged sectional view taken along line 8-8 of FIG. 6;

【図9】図6の9−9線拡大断面図FIG. 9 is an enlarged sectional view taken along line 9-9 of FIG. 6;

【図10】本発明の実施例を示す,図6に対応した縦断
面図
FIG. 10 is a longitudinal sectional view showing an embodiment of the present invention and corresponding to FIG. 6;

【符号の説明】[Explanation of symbols]

17・・・カムシャフト 19,20,21・・・カム 22,23,24・・・カムフォロアとしてのロッカア
ーム 25・・・揺動支軸としてのロッカアームシャフト 301 ,302 ,303 ・・・高速用連結分離手段 311 ,312 ・・・連結分離手段 32,42,45,68,69,80・・・連結ピン 62・・・制御手段 V1 ,V2 ……機関弁としての吸気弁
17 camshafts 19, 20, 21 ... cams 22, 23, 24 ... rocker arms 25 as cam followers 25 ... rocker arm shafts 30 1 , 30 2 , 30 3 ... High-speed connection / separation means 31 1 , 31 2 ... Connection / separation means 32, 42, 45, 68, 69, 80 ... Connection pin 62 ... Control means V 1 , V 2 ... Intake as an engine valve valve

───────────────────────────────────────────────────── フロントページの続き (56)参考文献 特開 平4−292509(JP,A) 特開 昭64−41607(JP,A) 特開 平6−93821(JP,A) 実開 平4−127813(JP,U) (58)調査した分野(Int.Cl.7,DB名) F01L 13/00 301 F01L 13/00 302 ──────────────────────────────────────────────────続 き Continuation of the front page (56) References JP-A-4-292509 (JP, A) JP-A-64-41607 (JP, A) JP-A-6-93821 (JP, A) 127813 (JP, U) (58) Fields investigated (Int. Cl. 7 , DB name) F01L 13/00 301 F01L 13/00 302

Claims (1)

(57)【特許請求の範囲】(57) [Claims] 【請求項1】 ロフィルを相互に異ならせてカムシャ
フト(17)に設けられる3つ以上のカム(19,2
0,21)と,それらのカム(19,20,21)に個
別に対応して同一の揺動支軸(25)まわりに揺動可能
に配置されるとともに少なくとも1つに機関弁(V1
2 )が連動,連結される複数のカムフォロア(22,
23,24)と,前記揺動支軸(25)と平行な軸線に
沿う連結位置および連結解除位置間での相互に独立した
切換作動を可能とした連結ピン(68,69;80)を
それぞれ有するとともに該連結ピン(68,69;8
0)により連結されるカムフォロア(22,23,2
4)の組合せを異ならせた複数の連結分離手段(3
3 ;312 )とを備える内燃機関の動弁装置におい
て, 複数のカム(19,20,21)は,それらのカム(1
9,20,21)のうち機関の高速運転域に対応したプ
ロフィルのカム(19)をカムシャフト(17)の軸線
に沿う外側に配置してカムシャフト(17)に設けら
れ, 機関の高速運転域で全てのカムフォロア(22,23,
24)を連結する状態ならびに前記高速運転域以外で連
結を解除する状態を切換可能な高速用連結分離手段(3
3 )と,機関弁(V1 ,V2 )に連動,連結されたカ
ムフォロア(23,24)への他のカムフォロア(2
4,23)の連結および連結解除を切換可能な1あるい
は複数の連結分離手段(312 )とが,前記揺動支軸
(25)の周方向に相互に異なる位置でカムフォロア
(22,23,24)に配設されると共に,その高速用
連結分離手段(303 )を含む全ての連結分離手段(3
3 ,312 )が,前記揺動支軸(25)の軸方向一端
外方より見て,機関弁(V1 ,V2 )に連動,連結され
たカムフォロア(23,24)の機関弁側の端部と前記
揺動支軸(25)との間を避けた位置に配設され, 前記カムシャフト(17)は,前記揺動支軸(25)よ
りも下方に配設され,前記高速用連結分離手段(3
3 )は,カムシャフト(17)に設けたカム(19,
20,21)の直上に配設されると共に,該揺動支軸
(25)から見て機関弁(V1 ,V2 )とは反対側に配
置され,該高速用連結分離手段(303 )の連結ピン
(68,69)と同軸に配置されて各カムフォロア(2
2,23,24)に対応するカム(19,20,21)
に転がり接触するローラ(88)が該各カムフォロア
(22,23,24)に軸支されることを特徴とする内
燃機関の動弁装置。
1. A three or more cams which the flop Rofiru was different from each other are provided on the camshaft (17) (19, 2
0, 21) and their cams (19, 20, 21), respectively, and are arranged so as to be swingable around the same swing support shaft (25), and at least one of the engine valves (V 1 ,
V 2 ) are linked and connected to a plurality of cam followers (22,
23, 24) and connecting pins (68, 69; 80) enabling switching operation independently between a connecting position and a disconnecting position along an axis parallel to the swing support shaft (25). And the connecting pins (68, 69; 8)
0) connected by cam followers (22, 23, 2)
A plurality of connection / separation means (3) with different combinations of (4)
0 3 ; 31 2 ), the plurality of cams (19, 20, 21) are provided with the cams (1).
9, 20, 21), the cam (19) having a profile corresponding to the high-speed operation range of the engine is arranged on the outer side along the axis of the camshaft (17), and is provided on the camshaft (17). All cam followers (22,23,
24) and a high-speed connection / separation means (3) capable of switching between a connection state and a connection release state other than in the high-speed operation range.
0 3 ) and the other cam followers (2) to the cam followers (23, 24) interlocked and connected with the engine valves (V 1 , V 2 ).
One or a plurality of connection / separation means (31 2 ) capable of switching connection / disconnection of the cam followers (22, 23, 23) at different positions in the circumferential direction of the swing support shaft (25). 24) and all the connection / separation means (3) including the high-speed connection / separation means (30 3 ).
0 3 , 31 2 ) are linked to the engine valves (V 1 , V 2 ) when viewed from the outside of one end in the axial direction of the swing support shaft (25). The camshaft (17) is disposed below the pivot shaft (25), and the camshaft (17) is disposed below the pivot shaft (25). High-speed connection / separation means (3
0 3 ) is a cam (19, 19) provided on the cam shaft (17).
While being disposed directly above the 20, 21), arranged on the opposite side to the engine valves as viewed from the swing shaft (25) (V 1, V 2), the high-speed connecting and separating means (30 3 ) Are arranged coaxially with the connection pins (68, 69) of each cam follower (2).
Cams (19, 20, 21) corresponding to (2, 23, 24)
Valve operating equipment of an internal combustion engine rolling contact with the roller (88) is characterized in that it is pivotally supported by the respective cam follower (22, 23, 24) on.
JP29843693A 1993-11-29 1993-11-29 Valve train for internal combustion engine Expired - Fee Related JP3358852B2 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP29843693A JP3358852B2 (en) 1993-11-29 1993-11-29 Valve train for internal combustion engine

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP29843693A JP3358852B2 (en) 1993-11-29 1993-11-29 Valve train for internal combustion engine

Publications (2)

Publication Number Publication Date
JPH07150919A JPH07150919A (en) 1995-06-13
JP3358852B2 true JP3358852B2 (en) 2002-12-24

Family

ID=17859690

Family Applications (1)

Application Number Title Priority Date Filing Date
JP29843693A Expired - Fee Related JP3358852B2 (en) 1993-11-29 1993-11-29 Valve train for internal combustion engine

Country Status (1)

Country Link
JP (1) JP3358852B2 (en)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP7021584B2 (en) * 2018-03-28 2022-02-17 いすゞ自動車株式会社 Variable valve gear for internal combustion engine

Also Published As

Publication number Publication date
JPH07150919A (en) 1995-06-13

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