JPH09323068A - 起振用偏心重錘の位相差制御方法、および同位相差制御機構 - Google Patents

起振用偏心重錘の位相差制御方法、および同位相差制御機構

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Publication number
JPH09323068A
JPH09323068A JP14533896A JP14533896A JPH09323068A JP H09323068 A JPH09323068 A JP H09323068A JP 14533896 A JP14533896 A JP 14533896A JP 14533896 A JP14533896 A JP 14533896A JP H09323068 A JPH09323068 A JP H09323068A
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Yukichi Suzuki
勇吉 鈴木
Toshio Inoue
敏男 井上
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Chowa Kogyo Co Ltd
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Chowa Kogyo Co Ltd
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Abstract

(57)【要約】 【課題】 共通の回転軸４１に固定偏心重錘４９を固着
するとともに、上記共通の回転軸に対して可動偏心重錘
５１を相対的に回動可能に取り付けた構造の起振機を改
良して、固定偏心重錘に対する可動偏心重錘の位相差の
調節を簡単な機構で行なえるようにする。 【解決手段】 （Ａ）図に示すように、位相差制御バネ
５３によって、可動偏心重錘５１の位相を進める方向に
押す。その進相角度はストッパ６１によって制限され、
（Ａ）図においては双方の偏心重錘の総合偏心モーメン
トがゼロである。（Ｂ）図に示すように、固定偏心重錘
４９を矢印Ｒ方向に回転駆動しつつ可動偏心重錘５１を
軽く制動すると、該可動偏心重錘は位相差制御バネ５３
を撓ませて遅相し、総合偏心モーメント最大の状態にな
って起振力を発生する。

Description

【発明の詳細な説明】
【０００１】
【発明の属する技術分野】本発明は、杭打ち用のロータ
リ式起振機に設けられている固定偏心重錘と可動偏心重
錘との位相差を制御するために創作した位相差制御方法
および位相差制御機構に関するものであって、杭打ち用
以外のロータリ起振機に適用することもできる。
【０００２】
【従来の技術】土木建設工事に用いられる振動装置（起
振機）は一般に、偏心重錘を取りつけた複数対の回転軸
を平行に配設した構造である。このような構成によれ
ば、反対方向に回転する偏心重錘の遠心起振力を所望の
方向については相加せしめるとともに、不要の方向につ
いては相殺せしめることができる。上述した起振機を用
いて杭打作業を行う場合、振動公害の防止と騒音公害の
防止とが重要な問題となる。次に、図４，図５について
振動公害に関する技術的問題を説明する。
【０００３】図４は杭打ち作業における振動公害を説明
するための模式図である。本図は、クレーンブーム５で
振動装置６を吊持するとともに、該振動装置６のチャッ
ク６ａで杭７の上端を把持し、この杭７に振動を与えて
地中に打設している状態を描いてある。杭７の下端を地
表に接せしめて杭打作業を開始する際、最初から振動装
置６をフル稼働させると、杭打ち地点の地表で発生する
地表波ａが殆ど減衰せずに付近の民家８に到達するので
振動公害の問題を生じる。ここで、振動装置６の起振力
を任意に調節できるならば、杭７の自重に加えて僅かな
振動を与えながら杭打ち作業を開始し、数メートル打ち
込んでから次第に振動を強くすれば良い。
【０００４】杭７の下端に相当する震源位置が深くなれ
ば、地中波ｂは民家８に到達する途中で減衰するので振
動公害は軽微である。
【０００５】図５は振動装置の運転開始時および運転停
止時における振動数の変化を示す図表で、横軸は時間で
ある。運転開始時点ｔ0から、定格運転状態に到達する
時点ｔ1までの間、振動数は矢印ｃの如く急激に上昇す
る。上記の振動数上昇中に、地盤の固有振動数ｎ1、及
びクレーンブームの固有振動数ｎ2を通過する。しか
し、運転開始時における回転数上昇期間Ｔ1は一般に短
時間（例えば約３秒間）であるから、振動装置の振動数
が固有振動数に一致したときの共振の問題は、通常無視
することができる。しかし、振動装置６のモータ（図示
せず）の通電を停止した時点ｔ2から回転軸が停止する
時点ｔ3までの間は、回転軸が慣性で回転を続けながら
矢印ｄの如く次第に減速する。
【０００６】上記の回転数低下期間Ｔ2は比較的長時間
（例えば約５０秒間）であるから、その途中でクレーン
ブームの固有振動数ｎ2を通過する際、該クレーンブー
ムが共振して損傷を被る虞れが有る。また、地盤の固有
振動数ｎ1を通過する際、地盤の共振により振動公害を
生じる虞れが有る。前記の時刻ｔ2でモータの通電を停
止するとともに、振動装置の回転重錘の回転位相を変化
させて起振力を零にすることができれば、振動装置の運
転停止操作の際の共振に関する問題を防止することがで
きる。
【０００７】次に、振動装置に供給されるエネルギー量
について見ると、前記の時刻ｔ0からｔ1まで振動装置６
の回転数が上昇する間、該振動装置の偏心重錘（図示せ
ず）によって振動を発生させつつ増速すると、これを駆
動するために大容量のモータや大容量の電源設備が必要
になる。この場合、振動装置の偏心重錘の回転位相を変
化させて起振力を零にした状態で運転を開始し、定格回
転数に達した後に起振力を発揮させることが出来れば、
モータ容量や電源容量を縮少できるので経済的である。
定格回転数に達した後は、回転部材にそれ以上回転エネ
ルギーを蓄積する必要が無く、振動の減衰を補うだけの
エネルギーを補充することによって運転を継続できるか
らである。
【０００８】以上の事情に鑑みて、起振機の起振力を増
減させる調節技術が開発され、公知になっている。次
に、起振機の起振力を増減調節する原理について述べ
る。図６は２個の偏心重錘の組み合わせによって起振力
を変化させる公知技術を説明するために示したものであ
って、（Ａ）は２個の偏心重錘が最大起振力を発揮する
状態を表す模式図、（Ｂ）は起振力中程度である状態を
表す模式図、（Ｃ）は起振力がやや小さい状態を表す模
式図、（Ｄ）は起振力がゼロの状態を表す模式図であ
る。図６（Ａ）に示した２個の偏心重錘のうち、９は回
転軸２Ｂ′に固着された固定偏心重錘であり、１０は回
転軸２Ｃ′に対して相対的に回動し得る可動偏心重錘で
ある。本発明において固定偏心重錘とは回転軸に対する
相対的回動を係止された偏心重錘の意であって、回転軸
と一緒に回転する部材であるから、固定とは静止の意で
はない。図６（Ａ）における２個の偏心重錘９，１０の
相対的位置は、位相差ゼロの状態である。従って、この
図６（Ａ）の状態で、２個の偏心重錘９，１０を歯車４
Ｂ′，４Ｃ′で同期させて回転させると起振力が発生す
る。図６（Ｄ）の状態では、２個の偏心重錘９，１０そ
れぞれの重心が、常に参考線Ｍ−Ｍ（２本の回転軸２
Ｂ′，２Ｃ′を結ぶ線分の垂直２等分線）に関して対称
位置に在るので上下方向の起振力はゼロである。説明の
便宜上、本図６（Ｄ）のように２個の偏心重錘の位相差
が１８０度になって該２個の偏心重錘の総合偏心モーメ
ントがゼロの状態を基準状態と名付ける。図６（Ｂ），
（Ｃ）は、それぞれ前記（Ａ），（Ｄ）の中間的状態で
あるから（Ａ）図の場合よりも小さく（Ｄ）図の場合よ
りも大きい上下方向起振力を発生する。そして、（Ｂ）
図の方が（Ｃ）図よりも（Ａ）図の状態に近いから、起
振力の大きい方から順番に挙げると（Ａ），（Ｂ），
（Ｃ），（Ｄ）となる。前掲の図６において起振力増減
制御の原理を示すため、２本の回転軸２Ｂ′，２Ｃ′を
同期回転歯車４Ｂ′，４Ｃ′で同期回転させる形に描か
れているが、構造を簡単にするため１本の回転軸に２個
の偏心重錘を配設することもできる。図７は共通の回転
軸に対して固定偏心重錘を固着するとともに可動偏心重
錘を上記共通の回転軸に対する相対的な回動角位置を調
節できるようにした機構の模式図である。
【０００９】固定偏心重錘９は回転軸２に固着されて一
緒に回転する。可動偏心重錘１０は回転軸２に対する取
付角位置を円弧矢印α−βのごとく変化させて調節する
ことと、調節した状態を維持することとが出来るように
なっている。本図７に描かれている状態は前掲の図６
（Ｂ）に示した状態に対応し、起振力が中等度である。
この状態から、可動偏心重錘を矢印α方向に回動させて
固定すると図６（Ｄ）の状態に近づいて起振力が減少す
る。また矢印β方向に回動させると図６（Ａ）の状態に
近づいて起振力が増大する。以上のようにして起振力が
調節される。図８は上掲の図７に原理を示したように、
共通の１軸に対して固定偏心重錘と可動偏心重錘とを配
設して起振力を増減調節できるようにした起振機の従来
例を示す斜視図である。２本の回転軸２Ａ，２Ｂを水平
方向に並べて駆動用プーリ１１および同期回転用伝動歯
車４Ａ，４Ｂによって反対方向に（時計周りと反時計回
りに）同期回転させているのは、水平方向の起振力を相
殺させるためである。固定偏心重錘９Ａは回転軸２Ａに
固着されている。そして可動偏心重錘１０Ａは上記回転
軸２Ａに対して回動自在に支承されるとともに、固定偏
心重錘９Ａに対する回動を調節・固定できるようになっ
ている。すなわち、可動偏心重錘１０Ａには複数個の調
節用メネジ穴（本図において１個のみ現れている）１２
が穿たれている。セットボルト１４を上記メネジ穴１２
に螺合して六角レンチ１５で締めつけ、ノックピン１３
で回り止めを施すと可動偏心重錘１０Ａの角位置が固定
される。図９は前掲の図８に示した従来例の調節機構を
備えた起振機における回転軸と固定偏心重錘と可動偏心
重錘との関係を説明するために示したもので、（Ａ）は
部分的に切断して描いた外観斜視図であり、（Ｂ）は回
転軸と平行な方向に見たところを描いた模式図である。
図９（Ａ）に示した２３ａ，２３ｂ，２３ｃは目盛であ
って、単位はkg・cmである。目盛を合わせてセットボル
トを螺合することにより、図９（Ｂ）に示したように、
可動偏心重錘が３つの角位置をとり、１０ａ，１０ｂ，
１０ｃのように相対的に回動して起振力を変化させる。
図７ないし図９に示した従来技術に係る起振機は、以上
に説明したようにして起振力の増減調節を行なうことが
できる。
【００１０】
【発明が解決しようとする課題】図７ないし図９を参照
して説明した従来技術に係る起振機において起振力を増
減調節しようとすると、図８に表されている構造から容
易に理解されるように、運転を止め、ノックピン１３を
抜き取ってセットボルト１４を抜き出し、可動偏心重錘
１０を手動で回して目盛（図９において符号２３ａ〜２
３ｃ）を合わせた後、再びセットボルト１４を螺合し緊
定してノックピン１３で回り止めを施さねばならない。
従来技術において起振力の増減調節を行なうには、以上
のような操作を必要とする。図４について既に述べたよ
うに、起振装置６は杭７の上端に取り付けられているの
で、これをクレーンブーム５で吊り降して調節した後、
再びクレーンブーム５で吊り上げて杭７の上端に取りつ
ける作業は多大の時間と労力とを費さねばならない。１
本の回転中心軸に対して固定偏心重錘と可動偏心重錘と
を取り付け、しかも運転を中止することなく継続しつつ
起振力の増減調節を行なうには、図１０に示したような
構成が有効である。この技術は本発明者が創作して別途
出願中の、未公知の発明（特願平７−２３６６９５号）
であって、以下、先願の発明という。
【００１１】図１０は、先願の発明の起振力制御方法を
実施するために構成した先願の発明に係る偏心重錘の起
振力制御機構の１実施形態を備えた起振機を示し、模式
的に描いた水平断面図である。ケース１によって２本の
水平な軸、すなわちＡ系統回転軸２１とＢ系統回転軸２
２とが回転自在に支承されている。そしてＡ系統駆動歯
車２３がキー２４を介して前記Ａ系統回転軸２１に固着
されている。本図１０には７個のキーが描かれていて、
符号は１個のみ付されているが、キーの図形が描かれて
いることは回転軸に対して相対的に回動不能に嵌合され
ていることを表わしている。そして、キーの図形が描か
れていない個所は相対的な回動可能に嵌合されているこ
とを表している。
【００１２】Ａ系統の被動歯車２５は前記Ａ系統駆動歯
車２３と歯数が等しく、Ｂ系統の回転軸２２に対して回
動自在に嵌合されて支承されている。同様に、歯数の等
しいＢ系統の１対の歯車のうち、Ｂ系統駆動歯車３４は
Ｂ系統回転軸２２に対して回動不可能に固着され、Ｂ系
統被動歯車３１はＡ系統回転軸２１に対して回動可能に
嵌合され、支承されている。前記Ａ系統回転軸２１に対
して、Ａ系統固定偏心重錘２６が相対的回動不可能に、
Ｂ系統可動偏心重錘２７が相対的回動可能に、それぞれ
嵌合されて支持されるとともに、上記Ｂ系統可動偏心重
錘２７は前記Ｂ系統被動歯車３１に対して同期連結杆３
３を介して一体的に連結されて一緒に回転する。これに
より該Ｂ系統可動偏心重錘２７はＢ系統回転軸２２と反
対方向に、同じ回転速度で回転せしめられる。前記Ｂ系
統回転軸２２に対して、Ｂ系統固定偏心重錘２８が相対
的回動不可能に、Ａ系統可動偏心重錘２９が相対的回動
可能に、それぞれ嵌合されて支持されるとともに、上記
Ａ系統可動偏心重錘２９は前記Ａ系統被動歯車２５に対
して同期連結杆３０を介して一体的に連結されて一緒に
回転する。これにより該Ａ系統可動偏心重錘２９はＡ系
統回転軸２１と反対方向に、同じ回転速度で回転せしめ
られる。前記Ａ系統回転軸２１にＡ系統被動プーリ３５
が固着されるとともに、Ａ系統駆動モータＭａにＡ系統
駆動プーリ３８が固着されており、上記Ａ系統被動プー
リ３５とＡ系統駆動プーリ３８とに巻掛伝動手段３７が
巻き掛けられて伝動している。前記Ｂ系統回転軸２２に
Ｂ系統被動プーリ３６が固着されるとともに、Ｂ系統駆
動モータＭｂにＢ系統駆動プーリ３９が固着されてお
り、上記Ｂ系統被動プーリ３６とＢ系統駆動プーリ３９
とに巻掛伝動手段３７が巻き掛けられて伝動している。
【００１３】この図１０の装置を用いて杭打ち作業を行
なうためには、（図５を併せて参照）作業開始点ｏで、
Ｂ系統駆動モータＭｂを作動させて、偏心モーメント最
小（起振力最小，振動加速度約ｇ）で回転を始め、矢印
ｃのように回転数を上昇させつつ、地盤固有地動数
ｎ1、およびクレーンブーム固有振動数ｎ2を偏心モーメ
ント最小の状態で通過する。通過し終えると、Ｂ系統駆
動モータＭｂの通電を断ち、もしくは通電を弱めて、Ａ
系統駆動モータＭａを作動させる。この場合、偏心重錘
の回転数（回転速度）と発生する振動の振動数とは等し
い。回転数が定格回転数に達すると（点ｉ）、定常運転
に移行する。この状態では、Ａ系統が基準状態よりも一
定角度進相して最大偏心モーメントとなり、最大起振力
を発揮しつつ杭打作業を遂行する。この定常運転は、Ａ
系統がＢ系統を引っ張る形で、Ｂ系統は一定角度遅れて
追随する。この定状状態の運転期間中、Ｂ系統駆動モー
タＭｂは通電を断っておいても良い。また、Ｂ系統がＡ
系統に追いつかない程度に、Ｂ系統駆動モータＭｂに電
気エネルギーを供給しても良い。杭打ち作業を遂行し終
えたとき（点ｊ）Ａ，Ｂ両系統の駆動モータＭａ，Ｍｂ
の給電を停止するとともに、Ａ系統駆動モータＭａに電
気制動を掛ける。これにより、偏心モーメント最小の状
態となり、クレーンブーム固有振動数ｎ2，地盤固有振
動数ｎ1を順次に通過して矢印ｄのごとく減速し、停止
（点ｍ）するに至る。
【００１４】本発明者は、前掲の図１０に示した先願の
発明を出願した後、その工業的生産を遂行するとともに
一層の改良研究、特に実用化試験を繰り返し続行した結
果、該先願の発明が実用条件下において所期の効果を奏
し、振動公害の防止に貢献するところ多大であることを
確認するとともに、なお改善の余地が有ることを確認す
るに至った。すなわち、（イ）Ａ系統およびＢ系統の駆
動モータを制御するために、Ａ，Ｂ両系統それぞれの作
動状態を詳細に検出しなければならない。その上、
（ロ）検出結果に基づいてＡ系統の駆動モータとＢ系統
の駆動モータとを連動させて制御しなければならないの
で、制御機構が複雑になる。制御機構が複雑であると製
造コストが高価になる上に、メンティナンスが難しくな
り、作動信頼性を高くすることが容易でない。
【００１５】本発明は上述の事情に鑑みて為されたもの
であって、前記の先願に係る発明を改良し、「運転を継
続しつつ偏心重錘の総合偏心モーメントを増減調節して
起振力を制御することができる」という長所を損なうこ
となく、簡単な機構で固定偏心重錘と可動偏心重錘との
位相差を、確実にかつ安定した状態で制御し得る技術を
提供することを目的とする。
【００１６】
【課題を解決するための手段】上記の目的を達成するた
めに創作した本発明の基本的原理について、その１実施
形態に対応する図１を参照して略述すると、 （ａ）回転軸４１に対して固定偏心重錘４９と可動偏心
重錘５１と取り付け、該固定偏心重錘４９を円弧矢印Ｒ
方向に回転駆動する（これは公知の構成である）。 （ｂ）同図（Ａ）に示されているように、固定偏心重錘
４９と可動偏心重錘５１との間に、「可動偏心重錘５１
を回転方向に押動する位相差制御バネ５３」を設ける。
これにより、可動偏心重錘５１は固定偏心重錘４９に比
して位相が進む方向の力を与えられる。 （ｃ）可動偏心重錘５１の進相を、ストッパ６１によっ
て制限する。この（Ａ）図の状態は、ストッパが利いて
基準状態（偏心モーメントがゼロ）になっているところ
である。 （ｄ）図１（Ｂ）に示すように、固定偏心重錘４９を円
弧矢印Ｒ方向に回転させながら、可動偏心重錘５１に軽
い制動（回転に対する抵抗）を与えると、位相差制御バ
ネ５３を撓ませて該可動偏心重錘５１が遅相して、総合
偏心モーメントが増加する。
【００１７】この図１は本発明における一つの実施形態
であって、この構成に限定されるものではないが、固定
偏心重錘に対する可動偏心重錘の位相を進める手段（例
えばバネ）と、上記位相差を制限する手段（例えばスト
ッパ）と、可動偏心重錘の回転に抵抗を与える手段（例
えばブレーキ）とを組み合わせることが本発明の基本的
な原理である。
【００１８】以上に説明した原理に基づいて、請求項１
の発明は、共通の回転軸に対して固定偏心重錘を相対的
回動不能に取り付けるとともに、該共通の回転軸に対し
て可動偏心重錘を相対的回動可能に取り付け、上記双方
の偏心重錘の位相差を制御して、「前記回転軸に対する
双方の偏心重錘の総合偏心モーメントがほぼゼロとなる
起振力ゼロ状態」と、「前記回転軸に対する双方の偏心
重錘の総合偏心モーメントが最大となる起振力最大状
態」との間で起振力を調節操作する方法において、固定
偏心重錘の位相に対して可動偏心重錘の位相を進ませる
方向に作用する回動力付与手段を設けて、上記可動偏心
重錘の位相を進めて起振力ゼロ状態ならしめ、上記の起
振力ゼロの状態で前記回転軸の回転駆動を開始して、回
転速度を定常運転の回転速度まで上昇せしめ、上記の回
転速度が、有害な共振周波数に相当する回転速度域を通
過した後、可動偏心重錘の回転に抵抗を与え、前記の回
動力付与手段を撓ませて該可動偏心重錘の位相を遅れさ
せて起振力最大状態とし、上記の起振力最大状態で起振
機としての作業を遂行して、および／または、定常運転
の回転速度で可動偏心重錘の回転に与えていた抵抗を解
除し、前記の回動力付与手段によって前記可動偏心重錘
の位相を進ませて起振力ゼロ状態ならしめ、回転軸の回
転駆動を解消して、起振力ゼロ状態で回転速度を低下せ
しめて停止に至らしめることを特徴とする。以上に説明
した請求項１の発明によると、簡単な制御機構を用いて
固定偏心重錘と可動偏心重錘との位相差を増減調節する
ことにより、運転を継続しつつ起振力を調節することが
でき、特に、回転駆動しなければならないのは固定偏心
重錘のみであって、可動偏心重錘には回転抵抗を与える
だけで足り、しかも、何らかの事情（故障など）によっ
て回転抵抗を与えることが出来なくなった場合、自動的
に起振力が消失するので安全である。
【００１９】請求項２の発明の構成は前記請求項１の発
明の構成に加えて、固定偏心重錘に対する可動偏心重錘
の相対的な回動可能角度を約３０度に規制し、運転開始
時には、可動偏心重錘に対して別段の操作力を与えるこ
となく、固定偏心重錘に回転駆動力を与えるとともに、
該固定偏心重錘により回動力付与手段を介して可動偏心
重錘を回転駆動することによって起振力ゼロの状態を保
ちつつ回転速度を上昇させて定格回転速度に到達し、回
転速度が定格回転速度に到達した時、もしくはその前後
において可動偏心重錘に制動力を加え、上記制動力の大
きさを「回動力付与手段を撓ませて、可動偏心重錘を前
記回動可能範囲内の最も遅れた位相ならしめるに足りる
程度」とすることにより、起振力最大状態を維持するこ
とを特徴とする。以上に説明した請求項２の発明による
と、請求項１の発明を実施する場合に固定偏心重錘に与
える回転駆動エネルギーの内、可動偏心重錘の制動によ
つて失われるエネルギーを最小ならしめることができ、
その上、位相角の変化範囲が約３０度に制限されている
ので、位相変化による起振力変化の応答性が良く、しか
も実用上充分な偏心モーメントを生じさせることがで
き、充分な起振力が得られる。
【００２０】請求項３の発明の構成は前記請求項１の発
明の構成に加えて、可動偏心重錘の回転に与える抵抗の
大きさを、「可動偏心重錘が回動力付与手段を撓ませて
起振力ゼロ状態を現出するに足る力」よりも小さくし
て、起振力ゼロの状態と起振力最大の状態との中間の状
態で起振力を発生させる操作を行なうことにより、最大
起振力以内の範囲で起振力を増減調節することを特徴と
する。以上に説明した請求項３の発明によると、請求項
１の発明を実施する際、最大起振力以内の範囲内で、任
意の大きさの起振力を発生するよう、無段階的に起振力
を調節することができる。
【００２１】請求項４の発明の構成は、共通の回転軸に
対して固定偏心重錘を相対的回動不能に取り付けるとと
もに、該共通の回転軸に対して可動偏心重錘を相対的回
動可能に取り付け、上記双方の偏心重錘の位相差を制御
して、「前記回転軸に対する双方の偏心重錘の総合偏心
モーメントがほぼゼロとなる起振力ゼロ状態」と、「前
記回転軸に対する双方の偏心重錘の総合偏心モーメント
が最大となる起振力最大状態」との間で起振力を調節操
作する方法において、固定偏心重錘の位相に対して可動
偏心重錘の位相を進ませる方向に作用する回動力付与手
段を設けて、別段の操作力を加えないとき可動偏心重錘
の位相を上記回動力付与手段の力で進ませて起振力最大
状態ならしめ、運転開始時には、固定偏心重錘を回転駆
動するとともに可動偏心重錘の回転に抵抗を与えて該可
動偏心重錘の位相を遅れさせることによって起振力ゼロ
状態ならしめることを特徴とする。以上に説明した請求
項４の発明によると、簡単な制御機構を用いて、しかも
運転を継続したままで起振力を増減調節することがで
き、特に、最大起振力を発生させている状態で、可動偏
心重錘の制動によるエネルギーロスを生じることが無
く、しかも、可動偏心重錘に回転駆動力を与えて固定偏
心重錘の回転駆動手段を援助することができる。
【００２２】請求項５の発明の構成は前記請求項４の発
明の構成に加えて、前記偏心重錘に対する可動偏心重錘
の位相を起振力最大状態まで進ませたとき、可動偏心重
錘の位相が固定偏心重錘の位相に対してそれ以上進まな
いように回動制限手段によって拘束し、固定偏心重錘を
回転駆動するとともに、可動偏心重錘に対しても固定偏
心重錘と同じ方向の回転駆動力を与えることを特徴とす
る。以上に説明した請求項５の発明によると、請求項４
の発明を実施する際、固定偏心重錘の駆動手段を、可動
偏心重錘の回転駆動手段によって、安定した状態で援助
して、最大起振力を発生させることができ、特に、最大
起振力を発生させる運転状態を維持するために別段の制
御を必要としない。
【００２３】請求項６の発明の構成は前記請求項１，４
の発明の構成に加えて、前記の回転軸と、固定偏心重錘
と、可動偏心重錘とより成る起振ユニットの１対を用
い、上記１対の起振ユニットを構成している２個の固定
偏心重錘の回転を同期せしめるとともに、該１対の起振
ユニットを構成している２個の可動偏心重錘の回転を同
期せしめ、前記１対の起振ユニットを構成している２本
の回転軸の内の片方を固定偏心重錘に同期せしめるよう
に連結し、かつ、上記２本の回転軸の内の他方を可動偏
心重錘に同期せしめるように連結し、固定偏心重錘に連
結した回転軸を回転駆動するとともに、可動偏心重錘に
連結した回転軸を調節制御可能に制動することを特徴と
する。以上に説明した請求項６の発明によると、１対の
起振ユニットを構成している２個の固定偏心重錘を１個
の回転駆動手段によって駆動するとともに、２個の可動
偏心重錘の回転に対して１個の制動手段によって抵抗を
与えることができるので、制御系統がいっそう簡単にな
り、しかも、所望方向の振動分力を相加せしめるととも
に不要方向の振動分力を相殺せしめることができる。
【００２４】請求項７の発明の構成は前記請求項６の発
明の構成に加えて、前記の固定偏心重錘に連結した回転
軸を回転駆動するとともに、可動偏心重錘に連結した回
転軸を調節可能に制動することを特徴とする。以上に説
明した請求項７の発明によると、前記請求項６の発明を
実施する際、該請求項６の発明の作用，効果を妨げるこ
となく、起振力の大小を無段階に増減調節することがで
きる。
【００２５】請求項８の発明の構成は、共通の回転軸に
対して、偏心モーメント量が等しく又はほぼ等しい固定
偏心重錘と可動偏心重錘とが取り付けられており、上記
固定偏心重錘と可動偏心重錘とが、前記の回転軸まわり
に相対的に回動し得る範囲を規制されるともに、可動偏
心重錘の位相を固定偏心重錘の位相に対して進ませる方
向の弾性的な回動力を付与する手段が設けられており、
可動偏心重錘の位相が固定偏心重錘の位相に対して、相
対的な回動を規制されている範囲内で最も進んだとき、
双方の偏心重錘の総合偏心モーメントがほぼゼロとなる
起振力ゼロ状態になり、かつ、固定偏心重錘を回転駆動
しつつ可動偏心重錘の回転に抵抗を与えて前記回動力付
与手段の力に抗して該可動偏心重錘の位相を遅れさせる
ことにより、総合偏心モーメントが最大となる起振力最
大状態ならしめるための制動手段が設けられていること
を特徴とする。以上に説明した請求項８の発明による
と、可動偏心重錘に制動力を与えることによって偏心モ
ーメントが増加し、２系統の駆動モータを連動せしめて
制御する必要無く起振力を増減調節することができる。
特に、前記制動手段に異常を生じて制動力が消失したと
き起振力が自動的にゼロとなるので安全である。
【００２６】請求項９の発明の構成は、共通の回転軸に
対して、偏心モーメント量が等しく又はほぼ等しい固定
偏心重錘と可動偏心重錘とが取り付けられており、上記
固定偏心重錘と可動偏心重錘とが、前記の回動軸まわり
に相対的に回動し得る範囲を規制されるとともに、可動
偏心重錘の位相を固定偏心重錘の位相に対して進ませる
方向の弾性的な回動力を付与する手段が設けられてお
り、可動偏心重錘の位相が固定偏心重錘の位相に対し
て、相対的な回動を規制されている範囲内で最も遅れた
とき、双方の偏心重錘の総合偏心モーメントがほぼゼロ
となる起振力ゼロ状態になり、かつ、可動偏心重錘が前
記回動力付与手段により、相対的な回動が規制されてい
る範囲内で最も進んだとき、双方の偏心モーメントが最
大となる起振力最大状態となり、かつ、可動偏心重錘の
回転に抵抗を与えて回動力付与手段の力に抗して位相を
遅れさせるための制動手段が設けられていることを特徴
とする。以上に説明した請求項９の発明によると、可動
偏心重錘に制動力を与えることによって偏心モーメント
が減少し、２系統の駆動モータを連動させて制御する必
要無く起振力を増減調節することができる。特に、最大
起振力を発生させる運転状態では制動力を与えないの
で、エネルギー効率が良い。
【００２７】請求項１０の発明の構成は前記請求項８，
９の発明の構成に加えて、前記の回転軸と固定偏心重錘
と可動偏心重錘とより成る起振ユニットの２組が、それ
ぞれの回転軸を平行ならしめて配置されるとともに、上
記２組の起振ユニットのそれぞれを構成している２本の
回転軸の内の片方の回転軸を回転駆動するモータ、およ
び、上記２本の回転軸の内の他方の回転に抵抗を与える
制動手段が設けられており、かつ、前記２組の起振ユニ
ットのそれぞれを構成している２個の固定偏心重錘の片
方が前記駆動側の回転軸に対する相対的な回動を係止さ
れ、２個の可動偏心重錘の他方が前記制動側の回転軸に
対する相対的な回動を係止されていることを特徴とす
る。以上に説明した請求項１０の発明によると、２組の
起振ユニットの両方が１個のモータで回転駆動されると
ともに１個の制動手段によって回転に抵抗を与えられる
ので駆動・制動機構が簡単であり、上記の駆動・制動機
構を制御するための機構も簡単で足りる。しかも、２組
の起振ユニットそれぞれの振動の相互を所望の振動方向
に関して相加せしめるとともに不要の振動方向に関して
相殺せしめることができるので汎用性が大きい。
【００２８】請求項１１の発明の構成は前記請求項９，
１０の発明の構成に加えて、前記の制動手段が、電気回
路中に可変抵抗器を備えた電気モータであることを特徴
とする。以上に説明した請求項１１の発明によると、電
気モータ回路中の可変抵抗器を操作して制動力を任意に
調節して起振力を増減制御することができ、しかも、制
動機として使用している電気モータを回転駆動機に切り
換えることもできるので用途範囲が拡大される。
【００２９】請求項１２の発明の構成は前記請求項９，
１０の発明の構成に加えて、前記の制動手段が、流体回
路中に可変オリフィスを備えた流体圧モータであること
を特徴とする。以上に説明した請求項１２の発明による
と、可変オリフィスを操作して制動力を任意に調節する
ことができる上に、制動機として設置した流体圧モータ
の回路を切り換えて回転駆動力を発生させることができ
るので、振動装置の汎用性を拡大せしめることができ
る。さらに、高圧電流を用いる必要が無いので安全であ
る。
【００３０】請求項１３の発明の構成は前記請求項９，
１０の発明の構成に加えて、前記の制動手段が、電磁ブ
レーキもしくは摩擦ブレーキであって、制動力を増減調
節できる構造のものであることを特徴とする。以上に説
明した請求項１３の発明によると、既製の制動専用機を
利用するに便利であり、しかも、制動力を精密かつ容易
に調節して起振力を高精度で増減制御することができ
る。
【００３１】請求項１４の発明の構成は前記請求項１０
の発明の構成に加えて、前記の固定偏心重錘を取り付け
た回転軸を介して固定偏心重錘を回転駆動する流体圧モ
ータもしくは電気モータよりなる駆動モータが設けられ
るとともに、上記駆動モータの回転速度と出力トルクと
の関係を表す性能特性をインプットした自動制御装置が
設けられており、かつ、上記の自動制御装置はインプッ
トされた駆動モータの特性に基づいて前記制動手段を制
御するものであることを特徴とする。以上に説明した請
求項１４の発明によると、作業員に高度の知識や熟練を
要せずに起振力の増減調節を円滑に行なうことができ、
操作ミスによって振動公害を発生する虞れが無い。
【００３２】
【発明の実施の形態】次に、図１と図２とを併せて参照
しつつ本発明の１実施形態を説明する。図１は、本発明
に係る起振用偏心重錘の位相差制御機構の１実施形態に
おける作動を説明するための模式図であって、（Ａ）は
起振力ゼロ状態を、（Ｂ）は起振力最大状態を、それぞ
れ表している。４１は、共通の回転軸であり、４９は固
定偏心重錘、５１は可動偏心重錘である。上記固定偏心
重錘４９は回転軸４１に固着されていて、円弧矢印Ｒ方
向に回転駆動される。上記固定偏心重錘４９に対して、
可動偏心重錘５１の位相を進めるように、すなわち円弧
矢印ｒ方向の回動力を付与する手段として位相差制御バ
ネ５３が設けられており、かつ、上記位相差制御バネ５
３による進角を制限するように規制する手段としてスト
ッパ６１が設けられている。本図１は模式化して描いて
あり、位相差制御バネ５３は伸縮形のバネ記号で表して
あるが、その実体的形状は図２を参照して後述するよう
にネジリコイル形のバネである。
【００３３】本図１（Ａ）に示すように固定偏心重錘４
９を円弧矢印Ｒ方向に回すと、可動偏心重錘５１は位相
差制御バネ５３で押される形で円弧矢印ｒ方向に回転せ
しめられる。この状態で、双方の偏心重錘は回転軸４１
に関して対称に位置しているので、該双方の偏心重錘の
総合偏心モーメントがゼロであり、回転しても起振力を
発生しない。本図１（Ｂ）に示すように、固定偏心重錘
４９を円弧矢印Ｒ方向に回転駆動しつつ、可動偏心重錘
５１に軽い制動力を与えると、位相差制御バネ５３を撓
ませて該可動偏心重錘５１の位相が遅れ、図示の状態に
おいて双方の偏心重錘の総合偏心モーメントが最大とな
り、起振力を発生する。本図１（Ｂ）の状態（起振力最
大状態）で回転させることによって起振機としての機能
が発揮されるが、この場合、可動偏心重錘５１に与える
制動力は、可動偏心重錘５１を遅相させて起振力最大状
態ならしめ得る最小限の制動力よりもあまり大きくしな
いことが望ましい。このためには、制動手段は制動力の
大きさを調節し得るものであることを必要とするが、そ
の具体的な方法および構成については図２を参照して後
述する。
【００３４】本図１に表されているように、固定偏心重
錘４９に対する可動偏心重錘５１の回動可能角度（すな
わち位相差の変化可能な角度範囲）は約３０度に設定さ
れている。３０度よりも大きく設定しておくと位相差変
化による起振力変化の応答性が遅れるので好ましくな
い。また、３０度よりも小さく設定しておくと最大起振
力の値が小さくなるので好ましくない。応答性の向上と
起振力の増大とは設計的に相反するが、本発明者の経験
と実験とによれば、約３０度とすることが最も適当であ
る。可動偏心重錘５１に与える制動力を、本図１の
（Ａ）と（Ｂ）との中間の値にすると、固定偏心重錘４
９に対して可動偏心重錘が基準状態よりも進相せしめら
れる位相差は（Ａ），（Ｂ）両図の中間の状態となる。
このようにして、最大起振力よりも小さい範囲内で、起
振力の大きさを任意に、かつ無段階的に変化させること
ができる。
【００３５】図２は、本発明に係る起振用偏心重錘の位
相差制御機構の実施形態を示し、模式的に描いた断面図
である。２本の回転軸４１，４２が平行に配置されてお
り、上記回転軸４１は被動プーリ４３，巻掛伝動手段４
４，および駆動プーリ４５を介して駆動モータ４６で回
転駆動される。上記の被動プーリ４３は、回転軸４１に
対してキーｋによって相対的回動不能に嵌着されてい
る。本図２においては４個のキーが描かれており、これ
らの４個所は相対的回動不能に嵌合されている。キーｋ
が描かれずにブッシュＢが描かれている部分は相対的回
動可能なことを表している。
【００３６】回転軸４１には固定偏心重錘４９と可動偏
心重錘５１とが取り付けられて１組の起振ユニットを形
成している。この起振ユニット部分を矢印Ｉ方向に見る
と前掲の図１のようになる。図１において模式的に描い
た位相差制御バネ５３は、本図２にバネ記号で示したよ
うなネジリコイルバネである。上記と同様に、回転軸４
２には固定偏心重錘５０と可動偏心重錘５２とが取り付
けられて１組の起振ユニットを形成していて、位相差制
御バネ５３が組み付けられている。
【００３７】上記２組の起振ユニットを構成している固
定偏心重錘４９と同５０とは、それぞれ固定偏心重錘歯
車４７，同４８を一体に連設されており、これらの歯車
を介して相互に強制的に同期せしめられている。同様
に、可動偏心重錘５１と同５２とは可動偏心重錘歯車５
４，５５を介して、相互に、強制的に同期せしめられて
いる。回転軸４２に取り付けられている符号Ｍ2の部材
は制動機である。この制動機としては、オイルモータ５
６などの流体圧モータ，電気モータ，電磁ブレーキ，も
しくは摩擦ブレーキなど、公知の制動機器を適用するこ
とができる。制動機Ｍ2としてオイルモータ５６を用い
た場合は、可変オリフィス５７を設けて制動力の調節を
可能ならしめる。また、制動機として電気モータ５８を
設けたときは、仮想線で示したように可変電気抵抗器５
９を設けて制動力の調節を可能ならしめる。前記の制動
機として、電磁ブレーキ６０，もしくは摩擦ブレーキを
用いても良い。このようにして、２組の起振ユニットを
１基を駆動機器Ｍ1で駆動するとともに１基の制動機器
Ｍ2によって位相差制御を行なうことができる。
【００３８】前記の制動機としてオイルモータ、もしく
は電気モータを用いた場合は、これを制動機としてのみ
でなく、回転駆動機として用いることもできる。本図２
に表されている構成から明らかなように、符号Ｍ2の部
材を回転駆動機として作用させると、可動偏心重錘５２
が回転駆動される。次に、可動偏心重錘を制動したり回
転駆動したりできるように構成した実施形態について述
べる。図３は、本発明に係る起振用偏心重錘の位相差制
御機構の１実施形態を示し、（Ａ）は起振力ゼロ状態を
描いた模式図であり、（Ｂ）は起振力最大状態を描いた
模式図である。この図３の実施形態においても、位相差
制御バネ５３は可動偏心重錘５１の位相を固定偏心重錘
４９よりも進ませるように作用する。そして本図３
（Ａ）のように固定偏心重錘４９を円弧矢印Ｒ方向に回
転駆動しつつ可動偏心重錘５１に軽制動を与えると該可
動偏心重錘５１の位相が遅れる。この位相遅れ角度をス
トッパ６１で制限し、ストッパが利いたとき起振力ゼロ
となるように上記ストッパ６１が設定されている。
【００３９】図３（Ａ）に示した起振力ゼロ状態で運転
を開始して増速し、有害な共振周波数に相当する回転速
度域を通過した後、もしくは定格回転速度に到達する前
後において、可動偏心重錘に与えていた軽制動を解除す
ると、本図３（Ｂ）に示したようになる。すなわち、固
定偏心重錘４９に対する可動偏心重錘５１の位相が許容
範囲内の最大限まで進んで起振力最大状態となる。この
図３（Ｂ）の状態においては、固定偏心重錘４９を円弧
矢印Ｒ方向に回転駆動しつつ、可動偏心重錘５１に同じ
方向（円弧矢印ｒ）の補助回転駆動を与えることができ
る。その理由は、可動偏心重錘５１に円弧矢印ｒ方向の
回転駆動力を与えても、これ以上位相関係に変化を生じ
ないからである。（図２参照）先に説明したように可動
偏心重錘に回転駆動を与えることは、制動機として設け
る機器Ｍ2をオイルモータ５６などの流体圧モータ、ま
たは電気モータ５８によって構成しておくことによって
可能となる。図示の機器Ｍ2を回転駆動機として作動さ
せると、駆動用のモータＭ1の回転駆動が援助される。
これにより、同じ容量の駆動用モータによってより大き
い起振力が得られ、また、同一起振力を発生させるため
に必要な駆動モータＭ1の容量が小さくて足りる。上記
のようにして、符号Ｍ2の機器を制動機として作動させ
たり回転駆動機として作動させたりする場合は、駆動用
の機器Ｍ1の特性カーブを記憶させた自動制御装置（図
示省略）によって、制動機兼駆動機Ｍ2を自動的に制御
すると、作業員に高度の知識や熟練を要せずに確実な操
業を行なうことができて好都合であり、操作ミスを発生
する虞れも無い。
【００４０】
【発明の効果】以上に本発明の実施形態を挙げてその構
成・作用を明らかならしめたように、請求項１の発明に
よると、簡単な制御機構を用いて固定偏心重錘と可動偏
心重錘との位相差を増減調節することにより、運転を継
続しつつ起振力を調節することができ、特に、回転駆動
しなければならないのは固定偏心重錘のみであって、可
動偏心重錘には回転抵抗を与えるだけで足り、しかも、
何らかの事情（故障など）によって回転抵抗を与えるこ
とが出来なくなった場合、自動的に起振力が消失するの
で安全である。請求項２の発明によると、請求項１の発
明を実施する場合に固定偏心重錘に与える回転駆動エネ
ルギーの内、可動偏心重錘の制動によつて失われるエネ
ルギーを最小ならしめることができ、その上、位相角の
変化範囲が約３０度に制限されているので、位相変化に
よる起振力変化の応答性が良く、しかも実用上充分な偏
心モーメントを生じさせることができ、充分な起振力が
得られる。請求項３の発明によると、請求項１の発明を
実施する際、最大起振力以内の範囲内で、任意の大きさ
の起振力を発生するよう、無段階的に起振力を調節する
ことができる。
【００４１】請求項４の発明によると、簡単な制御機構
を用いて、しかも運転を継続したままで起振力を増減調
節することができ、特に、最大起振力を発生させている
状態で、可動偏心重錘の制動によるエネルギーロスを生
じることが無く、しかも、可動偏心重錘に回転駆動力を
与えて固定偏心重錘の回転駆動手段を援助することがで
きる。請求項５の発明によると、請求項４の発明を実施
する際、固定偏心重錘の駆動手段を、可動偏心重錘の回
転駆動手段によって、安定した状態で援助して、最大起
振力を発生させることができ、特に、最大起振力を発生
させる運転状態を維持するために別段の制御を必要とし
ない。
【００４２】請求項６の発明によると、１対の起振ユニ
ットを構成している２個の固定偏心重錘を１個の回転駆
動手段によって駆動するとともに、２個の可動偏心重錘
の回転に対して１個の制動手段によって抵抗を与えるこ
とができるので、制御系統がいっそう簡単になり、しか
も、所望方向の振動分力を相加せしめるとともに不要方
向の振動分力を相殺せしめることができる。請求項７の
発明によると、前記請求項６の発明を実施する際、該請
求項６の発明の作用，効果を妨げることなく、起振力の
大小を無段階に増減調節することができる。
【００４３】請求項８の発明によると、可動偏心重錘に
制動力を与えることによって偏心モーメントが増加し、
２系統の駆動モータを連動せしめて制御する必要無く起
振力を増減調節することができる。特に、前記制動手段
に異常を生じて制動力が消失したとき起振力が自動的に
ゼロとなるので安全である。請求項９の発明によると、
可動偏心重錘に制動力を与えることによって偏心モーメ
ントが減少し、２系統の駆動モータを連動させて制御す
る必要無く起振力を増減調節することができる。特に、
最大起振力を発生させる運転状態では制動力を与えない
ので、エネルギー効率が良い。
【００４４】請求項１０の発明によると、２組の起振ユ
ニットの両方が１個のモータで回転駆動されるとともに
１個の制動手段によって回転に抵抗を与えられるので駆
動・制動機構が簡単であり、上記の駆動・制動機構を制
御するための機構も簡単で足りる。しかも、２組の起振
ユニットそれぞれの振動の相互を所望の振動方向に関し
て相加せしめるとともに不要の振動方向に関して相殺せ
しめることができるので汎用性が大きい。
【００４５】請求項１１の発明によると、電気モータ回
路中の可変抵抗器を操作して制動力を任意に調節して起
振力を増減制御することができ、しかも、制動機として
使用している電気モータを回転駆動機に切り換えること
もできるので用途範囲が拡大される。請求項１２の発明
によると、可変オリフィスを操作して制動力を任意に調
節することができる上に、制動機として設置した流体圧
モータの回路を切り換えて回転駆動力を発生させること
ができるので、振動装置の汎用性を拡大せしめることが
できる。さらに、高圧電流を用いる必要が無いので安全
である。
【００４６】請求項１３の発明によると、既製の制動専
用機を利用するに便利であり、しかも、制動力を精密か
つ容易に調節して起振力を高精度で増減制御することが
できる。請求項１４の発明によると、作業員に高度の知
識や熟練を要せずに起振力の増減調節を円滑に行なうこ
とができ、操作ミスによって振動公害を発生する虞れが
無い。
【図面の簡単な説明】
【図１】本発明に係る起振用偏心重錘の位相差制御機構
の１実施形態における作動を説明するための模式図であ
って、（Ａ）は起振力ゼロの状態を、（Ｂ）は起振力最
大状態を、それぞれ表している。
【図２】本発明に係る起振用偏心重錘の位相差制御機構
の実施形態を示し、模式的に描いた断面図である。
【図３】本発明に係る起振用偏心重錘の位相差制御機構
の１実施形態を示し、（Ａ）は起振力ゼロ状態を描いた
模式図であり、（Ｂ）は起振力最大状態を描いた模式図
である。
【図４】振動装置を用いる杭打工事における地上波およ
び地中波の伝達を示す説明図である。
【図５】振動杭打工事における共振現象を説明するため
の、時間−回転速度を表わした図表である。
【図６】２個の偏心重錘の組み合わせによって起振力を
変化させる公知技術を説明するために示したものであっ
て、（Ａ）は２個の偏心重錘が最大起振力を発生する状
態を示す模式図、（Ｂ）は起振力中程度である状態を表
す模式図、（Ｃ）は起振力がやや小さい状態を表す模式
図、（Ｄ）は起振力がゼロの状態を表す模式図である。
【図７】共通の回転軸に対して固定偏心重錘を固着する
とともに可動偏心重錘を上記共通の回転軸に対する相対
的な回動角位置を調節できるようにした機構の模式図で
ある。
【図８】上掲の図７に原理を示したように、共通の１軸
に対して固定偏心重錘と可動偏心重錘とを配設して起振
力を増減調節できるようにした起振機の従来例を示す斜
視図である。
【図９】前掲の図８に示した従来例の調節機構を備えた
起振機における回転軸と固定偏心重錘と可動偏心重錘と
の関係を説明するために示したもので、（Ａ）は部分的
に切断して描いた外観斜視図であり、（Ｂ）は回転軸と
平行な方向に見たところを描いた模式図である。
【図１０】先願の発明の起振力制御方法を実施するため
に構成した先願の発明に係る偏心重錘の起振力制御機構
の１実施形態を備えた起振機を示し、模式的に描いた水
平断面図である。
【符号の説明】
１…起振機のケース、２，２Ａ〜２Ｄ…回転軸、４，４
Ａ〜４Ｄ…同期伝動用の伝動歯車、５…クレーンブー
ム、６…振動装置（起振機）、７…杭、８…民家、４
１，４２…回転軸、４３…被動プーリ、４４…巻掛伝動
手段、４５…駆動プーリ、４６…駆動モータ、４７，４
８…固定偏心重錘歯車、４９，５０…固定偏心重錘、５
１，５２…可動偏心重錘、５３…位相差制御バネ、５
４，５５…可動偏心重錘歯車、５６…オイルモータ、５
７…可変オリフィス、５８…電気モータ、５９…可変電
気抵抗器、６０…電磁ブレーキ、６１…回動角規制手段
としてのストッパ。
─────────────────────────────────────────────────────
【手続補正書】
【提出日】平成８年９月４日
【手続補正１】
【補正対象書類名】明細書
【補正対象項目名】図３
【補正方法】変更
【補正内容】
【図３】本発明に係る起振機用偏心重錘の位相差制御機
構の作動説明図である。

Claims (14)

    【特許請求の範囲】
  1. 【請求項１】 共通の回転軸に対して固定偏心重錘を相
    対的回動不能に取り付けるとともに、該共通の回転軸に
    対して可動偏心重錘を相対的回動可能に取り付け、 上記双方の偏心重錘の位相差を制御して、「前記回転軸
    に対する双方の偏心重錘の総合偏心モーメントがほぼゼ
    ロとなる起振力ゼロ状態」と、「前記回転軸に対する双
    方の偏心重錘の総合偏心モーメントが最大となる起振力
    最大状態」との間で起振力を調節操作する方法におい
    て、 固定偏心重錘の位相に対して可動偏心重錘の位相を進ま
    せる方向に作用する回動力付与手段を設けて、上記可動
    偏心重錘の位相を進めて起振力ゼロ状態ならしめ、 上記の起振力ゼロの状態で前記回転軸の回転駆動を開始
    して、回転速度を定常運転の回転速度まで上昇せしめ、 上記の回転速度が、有害な共振周波数に相当する回転速
    度域を通過した後、可動偏心重錘の回転に抵抗を与え、
    前記の回動力付与手段を撓ませて該可動偏心重錘の位相
    を遅れさせて起振力最大状態とし、 上記の起振力最大状態で起振機としての作業を遂行し
    て、 および／または、 定常運転の回転速度で可動偏心重錘の回転に与えていた
    抵抗を解除し、前記の回動力付与手段によって前記可動
    偏心重錘の位相を進ませて起振力ゼロ状態ならしめ、 回転軸の回転駆動を解消して、起振力ゼロ状態で回転速
    度を低下せしめて停止に至らしめることを特徴とする、
    起振用偏心重錘の位相差制御方法。
  2. 【請求項２】 固定偏心重錘に対する可動偏心重錘の相
    対的な回動可能角度を約３０度に規制し、 運転開始時には、可動偏心重錘に対して別段の操作力を
    与えることなく、固定偏心重錘に回転駆動力を与えると
    ともに、該固定偏心重錘により回動力付与手段を介して
    可動偏心重錘を回転駆動することによって起振力ゼロの
    状態を保ちつつ回転速度を上昇させて定格回転速度に到
    達し、 回転速度が定格回転速度に到達した時、もしくはその前
    後において可動偏心重錘に制動力を加え、 上記制動力の大きさを「回動力付与手段を撓ませて、可
    動偏心重錘を前記回動可能範囲内の最も遅れた位相なら
    しめるに足りる程度」とすることにより、起振力最大状
    態を維持することを特徴とする、請求項１に記載した起
    振用偏心重錘の位相差制御方法。
  3. 【請求項３】 可動偏心重錘の回転に与える抵抗の大き
    さを、「可動偏心重錘が回動力付与手段を撓ませて起振
    力ゼロ状態を現出するに足る力」よりも小さくして、起
    振力ゼロの状態と起振力最大の状態との中間の状態で起
    振力を発生させる操作を行なうことにより、最大起振力
    以内の範囲で起振力を増減調節することを特徴とする、
    請求項１に記載した起振用偏心重錘の位相差制御方法。
  4. 【請求項４】 共通の回転軸に対して固定偏心重錘を相
    対的回動不能に取り付けるとともに、該共通の回転軸に
    対して可動偏心重錘を相対的回動可能に取り付け、 上記双方の偏心重錘の位相差を制御して、「前記回転軸
    に対する双方の偏心重錘の総合偏心モーメントがほぼゼ
    ロとなる起振力ゼロ状態」と、「前記回転軸に対する双
    方の偏心重錘の総合偏心モーメントが最大となる起振力
    最大状態」との間で起振力を調節操作する方法におい
    て、 固定偏心重錘の位相に対して可動偏心重錘の位相を進ま
    せる方向に作用する回動力付与手段を設けて、別段の操
    作力を加えないとき可動偏心重錘の位相を上記回動力付
    与手段の力で進ませて起振力最大状態ならしめ、 運転開始時には、固定偏心重錘を回転駆動するとともに
    可動偏心重錘の回転に抵抗を与えて該可動偏心重錘の位
    相を遅れさせることによって起振力ゼロ状態ならしめる
    ことを特徴とする起振用偏心重錘の位相差制御方法。
  5. 【請求項５】 前記偏心重錘に対する可動偏心重錘の位
    相を起振力最大状態まで進ませたとき、可動偏心重錘の
    位相が固定偏心重錘の位相に対してそれ以上進まないよ
    うに回動制限手段によって拘束し、 固定偏心重錘を回転駆動するとともに、可動偏心重錘に
    対しても固定偏心重錘と同じ方向の回転駆動力を与える
    ことを特徴とする、請求項４に記載した起振用偏心重錘
    の位相差制御方法。
  6. 【請求項６】 前記の回転軸と、固定偏心重錘と、可動
    偏心重錘とより成る起振ユニットの１対を用い、 上記１対の起振ユニットを構成している２個の固定偏心
    重錘の回転を同期せしめるとともに、該１対の起振ユニ
    ットを構成している２個の可動偏心重錘の回転を同期せ
    しめ、 前記１対の起振ユニットを構成している２本の回転軸の
    内の片方を固定偏心重錘に同期せしめるように連結し、
    かつ、上記２本の回転軸の内の他方を可動偏心重錘に同
    期せしめるように連結し、 固定偏心重錘に連結した回転軸を回転駆動するととも
    に、可動偏心重錘に連結した回転軸を調節制御可能に制
    動することを特徴とする、請求項１もしくは請求項４に
    記載した起振用偏心重錘の位相差制御方法。
  7. 【請求項７】 前記の固定偏心重錘に連結した回転軸を
    モータによって回転駆動するとともに、前記の可動偏心
    重錘に連結した回転軸をモータもしくはブレーキによっ
    て制動し、 かつ、上記固定偏心重錘を回転駆動するモータの作動特
    性を記憶させた自動制御装置によって、前記可動偏心重
    錘を制動するモータもしくはブレーキを自動的に制御す
    ることを特徴とする、請求項６に記載した起振用偏心重
    錘の位相差制御方法。
  8. 【請求項８】 共通の回転軸に対して、偏心モーメント
    量が等しく又はほぼ等しい固定偏心重錘と可動偏心重錘
    とが取り付けられており、 上記固定偏心重錘と可動偏心重錘とが、前記の回転軸ま
    わりに相対的に回動し得る範囲を規制されるともに、可
    動偏心重錘の位相を固定偏心重錘の位相に対して進ませ
    る方向の弾性的な回動力を付与する手段が設けられてお
    り、 可動偏心重錘の位相が固定偏心重錘の位相に対して、相
    対的な回動を規制されている範囲内で最も進んだとき、
    双方の偏心重錘の総合偏心モーメントがほぼゼロとなる
    起振力ゼロ状態になり、 かつ、固定偏心重錘を回転駆動しつつ可動偏心重錘の回
    転に抵抗を与えて前記回動力付与手段の力に抗して該可
    動偏心重錘の位相を遅れさせることにより、総合偏心モ
    ーメントが最大となる起振力最大状態ならしめるための
    制動手段が設けられていることを特徴とする、起振用偏
    心重錘の位相差制御機構。
  9. 【請求項９】 共通の回転軸に対して、偏心モーメント
    量が等しく又はほぼ等しい固定偏心重錘と可動偏心重錘
    とが取り付けられており、 上記固定偏心重錘と可動偏心重錘とが、前記の回動軸ま
    わりに相対的に回動し得る範囲を規制されるとともに、
    可動偏心重錘の位相を固定偏心重錘の位相に対して進ま
    せる方向の弾性的な回動力を付与する手段が設けられて
    おり、 可動偏心重錘の位相が固定偏心重錘の位相に対して、相
    対的な回動を規制されている範囲内で最も遅れたとき、
    双方の偏心重錘の総合偏心モーメントがほぼゼロとなる
    起振力ゼロ状態になり、 かつ、可動偏心重錘が前記回動力付与手段により、相対
    的な回動が規制されている範囲内で最も進んだとき、双
    方の偏心モーメントが最大となる起振力最大状態とな
    り、 かつ、可動偏心重錘の回転に抵抗を与えて回動力付与手
    段の力に抗して位相を遅れさせるための制動手段が設け
    られていることを特徴とする、起振用偏心重錘の位相差
    制御機構。
  10. 【請求項１０】 前記の回転軸と固定偏心重錘と可動偏
    心重錘とより成る起振ユニットの２組が、それぞれの回
    転軸を平行ならしめて配置されるとともに、 上記２組の起振ユニットのそれぞれを構成している２本
    の回転軸の内の片方の回転軸を回転駆動するモータ、お
    よび、上記２本の回転軸の内の他方の回転に抵抗を与え
    る制動手段が設けられており、 かつ、前記２組の起振ユニットのそれぞれを構成してい
    る２個の固定偏心重錘の片方が前記駆動側の回転軸に対
    する相対的な回動を係止され、２個の可動偏心重錘の他
    方が前記制動側の回転軸に対する相対的な回動を係止さ
    れていることを特徴とする、請求項８もしくは請求項９
    の何れかに記載した起振用偏心重錘の位相差制御機構。
  11. 【請求項１１】 前記の制動手段が、電気回路中に可変
    抵抗器を備えた電気モータであることを特徴とする、請
    求項９もしくは請求項１０に記載した起振用偏心重錘の
    位相差制御機構。
  12. 【請求項１２】 前記の制動手段が、流体回路中に可変
    オリフィスを備えた流体圧モータであることを特徴とす
    る、請求項９もしくは請求項１０に記載した起振用偏心
    重錘の位相差制御機構。
  13. 【請求項１３】 前記の制動手段が、電磁ブレーキもし
    くは摩擦ブレーキであって、制動力を増減調節できる構
    造のものであることを特徴とする、請求項９もしくは請
    求項１０に記載した起振用偏心重錘の位相差制御機構。
  14. 【請求項１４】 前記の固定偏心重錘を取り付けた回転
    軸を介して固定偏心重錘を回転駆動する流体圧モータも
    しくは電気モータよりなる駆動モータが設けられるとと
    もに、 上記駆動モータの回転速度と出力トルクとの関係を表す
    性能特性をインプットした自動制御装置が設けられてお
    り、 かつ、上記の自動制御装置はインプットされた駆動モー
    タの特性に基づいて前記制動手段を制御するものである
    ことを特徴とする、請求項１０に記載した起振用偏心重
    錘の位相差制御機構。
JP14533896A 1996-06-07 1996-06-07 起振用偏心重錘の位相差制御方法、および同位相差制御機構 Pending JPH09323068A (ja)

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