TW200907163A - Four-stroke internal combustion engine - Google Patents

Abstract

To provide a four-stroke internal combustion engine in which a restricting member, which restricts movement of a rocker arm in the axial direction of a rocker shaft, is more reliably attached to the rocker shaft, and which improves durability of the rocker arm and the restricting member. An engine 100 is provided with a collar 160 that restricts movement of a rocker arm 120 in the axial direction of a rocker shaft 140, and a bolt 180 that tightens and fixes the collar 160 to the rocker shaft 140. The collar 160 abuts against a section of an outer periphery of the rocker shaft 140 and also abuts against a side surface of the rocker arm 120.

Description

200907163 IX. Description of the Invention: [Technical Field] The present invention relates to a four-stroke internal combustion engine having: a rocker arm == timing point to push an intake and exhaust; and - inserting into the rocker A shaft that swingably supports the rocker arm. [Prior Art]

... is widely used in four-stroke internal combustion engines, in which the ::::: cam is used so that the rocking arm of the rocking is both timed and the crankshaft is inserted into the rocker arm. The rocker arm can be rocked by the rocker shaft. The second is to limit the movement of the rocker arm in the axial direction of the rocker shaft, known as -, ,,. (For example, see Patent (4), in which a flexible collar (restricting member) made of resin or metal is fitted to the rocker shaft and abuts the rocker arm. ^In other words, the collar has a cylindrical shape, wherein Forming a slit extending in the axial direction of the rocker shaft. As a result, when replacing an adjustment flap or the like for adjusting the gap between the intake and exhaust valve head and the rocker arm, the sleeve is produced. The width of the slit is widened to thereby allow the collar to be easily self-piercing the shaft 2. [Patent Document 1] JP-A-2004-278435 (pages 3 to 4, FIG. 8) [Summary of the Invention] DISCLOSURE] [Problems to be Solved by the Invention] However, the following problems have been provided to position the rocker arm in the above-mentioned known collar (ie, to limit the rocker arm to the sleeve of the rocking shaft) It becomes apparent to the constraining member of the movement of the 127632.doc 200907163. More specifically, since the rocker shaft is formed in the above-described known collar t, the slit shape extending in the direction of the ○ is problematic. When the gods are detached, sometimes they are in addition to the rocking arm of the shaking arm, the set of M 丄The condition made of resin and the case % are made of metal when the ratio is _ 邳 , , , , , , , , , 。 。 。 。 。 。 。 。 。 。 。 。 。 。 。 。 。 。 。 。 。 。 。 Compared with the case where the collar is made of resin, it is usually limited in the elastic sheet. In particular, when the jacket is made of metal, the sleeve is made of metal; In contrast, unless the tantalum is produced by the tree, unless the thickness of the sleeve is reduced in the diameter direction of the rocker shaft, it is impossible to obtain a thick product in the diameter direction of the desired shaft. However, if the collar is on the rocker, Moreover, the contact area between the collar and the rocker arm is also reduced, which increases the surface pressure of the contact surface of the collar and the rocker arm. As a result, the durability of the sleeve and the rocker arm is lowered. In the case of the present invention, a target of the present invention is provided for a four-stroke slamming engine, wherein the restricting member of the rocker arm is moved in the axial direction of the rocker shaft. Attached to the rocker shaft, the sin is attached to the rocker arm and the durability of the rocker arm and the restraining member. Problem 2] Solving the above problem 'The present invention has the following aspect. First, the present invention provides a four-stroke internal combustion engine (engine 100) including: an intake and exhaust valve (intake valve) 12 hole Π 125, exhaust valve 135); rocker arm (rocker arm 120, 榣 arm 130), directly pushes the intake and exhaust valve at the point of time, no ^, no 疋, and inserts through the rocker arm a rocker shaft (a rocker shaft 140, a rocker shaft 150), which can swing the rocker arm by 128632.doc 200907163. The four-stroke internal combustion engine includes a restraining member adjacent to the wide rocker arm (the collar 16〇, the sleeve, Positioning and moving in the axial direction of the rocker shaft; and fixing member) '1 restricting the rocker arm (10)), the restraining member is tightened "wang 180, screwing the outer periphery of the rocker shaft (outer periphery Call it = one side (side) 23, side 133). And the rocker arm is fastened to the rocker shaft in the four strokes as described above. As a result, the restraining member can be attached to the fixed shaft. The J is more securely attached to the rocker n' restraining member against the portion of the periphery of the rocker shaft, and the rocker shaft is rockably supported on the side of the rocker arm. Therefore, it is possible to reliably: the restraining member fastened to the rocker shaft by the fixing member is detached from the rocker shaft. There is no need to make the restraining member bendable as in the known restricting members described above. As a result, the thickness of the restricting member in the direction of the rocker in the k direction is larger than that of the known restricting member, thereby allowing the contact member to be increased in contact area with the side of the rocker arm. If the contact area of the restricting member and the side surface of the rocker arm is increased, the surface pressure of the contact surface of the restricting member and the rocker f is reduced, thereby improving the durability of the restricting member and the rocker arm. The first aspect of the present month is configured such that the first aspect of the present invention has an inner side surface abutting the outer periphery of the rocker shaft (the inner side is called 160, and is positioned on the rocker) The outer diameter side surface (outer side surface 16〇_) of the outer diameter surface of the shaft is more commensurate than the inner side surface. When viewed from the axial direction of the rocker shaft, from one end of the inner side surface (inner end 6〇b) to The center of the inner side surface (the height of the center (height hi) is greater than the height from the center of the inner side surface to the center of the outer side surface (center C2) (height H2) from 128632.doc 200907163. One of the inventions #-# j The second embodiment is configured such that in the first aspect of the invention, the restricting member has an inner side surface (inner surface 16 〇 ln) abutting the outer periphery of the rocker shaft and is positioned on the rocker shaft In the diametrical direction, it is more sinful than the inner side surface (the outer side surface 丨6〇〇ut). When viewed from the axial direction of the rocker shaft, from one end of the outer side surface (outer end a) to the outer side The other end of the surface (width of the outer end [width w 1) The diameter of the rocker shaft (diameter d). A fourth aspect of the invention is configured such that the first aspect/restriction member of the present invention has an inner side surface that abuts the outer periphery of the rocker shaft (' The surface of the crucible is 16〇 in) and is positioned closer to the outer side surface (outer surface 160out) than the inner surface in the diameter direction of the rocker shaft. When viewed from the axial direction of the rocker, one of the outer surfaces The height of the end (outer end 160a) to the center of the material side (center c2) is greater than the radius of the rocker shaft (half #R). A fifth aspect of the invention is configured to be the first in the present invention In the aspect, the fixing member is a screw member. A sixth aspect of the invention is configured such that in the fifth aspect of the invention, a screw hole (a screw hole 142, (4)) is formed in the rocker shaft, And the screw member is screwed into the screw hole. A seventh aspect of the present invention is configured such that in the first aspect of the invention, the restricting member is made of metal. The configuration is such that in the seventh aspect of the present invention 128632.doc 200907163, the limiting member is A ninth aspect of the present invention is the first energy head (cylinder head _) of the present invention. The limitation: the position: the disk 兮-j face (side 161) and the positioning of the brother-side opposite Adjacent to the cylinder 162). The second side of the shell (side [advantages of the invention] This aspect of the invention provides a four-stroke (four) engine in which the rocker arm is restricted from moving in the axial direction of the rocker shaft The restriction I^ member is more reliably attached to the ~shake shaft 'and improves the durability of the rocker arm and the restriction member. [Embodiment] Hereinafter, a four-stroke internal combustion engine of the present invention will be described with reference to the drawings. - Embodiments. Note that in the following drawings, the same or similar structural members are denoted by the same or similar reference numerals. It is also noted that these patterns are unthinking' and therefore the reader should be aware that the relative proportions of dimensions, etc. may not be physical. However, the specific size and the like can be determined based on the following description. In addition, it will be easy to understand that each of the drawings includes a portion in which the relationship and the ratio of the respective sizes are different. (Overall wheel temple of the structure of the oscillating type engine I) Fig. 1 is a side view showing the overall outline of the structure of the oscillating type engine unit 引擎 I 包括 including the engine 1 〇〇 which is the four-stroke internal combustion engine of this embodiment. The oscillating engine single 兀 1〇 is used in the scowa m〇t〇rcycle. The oscillating type engine unit 1 includes a motor unit and a transmission unit 2〇〇. 128632.doc 10-200907163 Engine 100 is a single-cylinder four-stroke internal combustion engine. The engine 1〇〇 is of type s〇Hc and has four valves (two intake valves, two exhaust valves). The transmission unit 200 includes a drive pulley, a V-belt (not shown), and the like connected to a crankshaft (not shown) of the engine 100, and transmits the driving force generated by the engine 100 to the speed Kedama After the round (not shown in the drawing). Further, the oscillating type engine unit 丨〇 has a suspension member 2 i 〇 which is held in a suspended manner by the suspension of the Scooter motorcycle so that the suspension member 2 1 0 can be swung. (Structure of Four-stroke Internal Combustion Engine) Next, the structure of the engine 1 (which is the four-stroke internal combustion engine of this embodiment) will be explained. (1) Overall outline of the structure of the cylinder head portion Fig. 2 is a perspective view of the wheel temple of the engine head portion of the engine. Note that FIG. 2 shows a state in which the cylinder head cover 104 and the plate 11 〇 (not shown in FIG. 2) are removed. As can be seen in Figure 2, a cylinder head 10 311 has a box shape. The cylinder head 100sh includes a center wall ιοί and a side wall 1〇2. The rocker arms 120, 130 are disposed in a space between the center wall 1〇1 and the side wall 1〇2. The rocker arm 120 pushes the intake valve 125 at a timed point (not shown in Figure 2, but see Figure 4). The rocker shaft 140 is inserted into the rocker arm 12''. The rocker shaft 14 〇 supports the rocker arm 120 in a rocking manner. The rocker arm 130 urges the exhaust valve 135 at a timed point (not shown in Figure 2, but see Figure 4). The rocker shaft 150 is inserted into the rocker arm 13''. The rocker shaft 15 〇 can be shaken 128632.doc 200907163 The ground support rocker 1 3 0. The rocker shafts 140, 150 are supported by the cylinder head 100, and more particularly by the center wall 110 and the side wall 102. Additionally, a set of rings 160 is attached to the rocker shaft 14〇. The collar 16 is disposed adjacent to the rocker arm 120 and restricts the rocker arm 12 from moving in the axial direction of the rocker shaft 14A. Similarly, a set of rings 170 is attached to the rocker shaft 15〇. The collar 17 is disposed adjacent to the rocker arm 130 and restricts the rocker arm 13 from moving in the axial direction of the rocker shaft 15A. The collars 160, 17A form the restraining members of this embodiment. The collar 160 is fastened to the rocker shaft 14〇 using bolts 180. The collar 170 is fastened to the rocker shaft 15〇 using a bolt. In this embodiment, the bolts 18, 190 form a fixing member. The bolts 18, 19 are screw members in which external threads are formed. (2) Detailed structure of the peripheral region of the rocker arm Fig. 3 is a plan view of the cylinder head portion of the engine. Figure 4 is a cross-sectional view of the cylinder head portion of the engine taken along line F4-F4 of Figure 3 . As shown in Figures 3 and 4, the plate 11 is attached to the cylinder head 1 〇〇sh. More specifically, the plate 11 is fixed to the cylinder head i〇〇sh using bolts lu. The plate 110 includes a shaft pressing member 110a that prevents the rocker shafts 14, 150 from disengaging from the cylinder head 100sh. Additionally, an opening 110b is formed in the panel 110 to allow easy access to the rocker arms 120, 130 and the collars 160, 170 and the like. The rocker 120 has a roller that is rotated by the intake cam 127. Referring to the drawing, similarly, the rocker arm 130 has a roller 1U that is rotated by the exhaust cam 137 to see Fig. 4). In other words, the rocker arm 2丄, i3〇 is the drum rocker arm. 128632.doc 12 200907163 As seen in Fig. 4, the intake port l〇3in and the exhaust port 103ex are formed in the cylinder head 100sh. Note that although not shown in the drawings, the cylinder head 10 811 has two intake ports 103in and an exhaust port 103ex. An intake valve 125 is provided in the intake port 103 in. Further, an exhaust valve 13 5 is provided in the exhaust port 103ex. Note that although not shown in the drawings, two intake valves 125 and an exhaust valve 135 are provided.

The intake valve 125 is urged at a timing point by the valve pressing member 122 formed in the rocker arm 120. More specifically, 'when the intake cam 127 rotates with the cam shaft 105', the drum 1 21 moves toward the cylinder head cover 1 〇4 side. When the drum 12! is moved toward the cylinder head cover 104 side, the rocker arm 12 is rocked about the rocker shaft 14', thereby causing the valve pressing member 122 to push the intake valve 125. When the intake valve 125 is pushed by the valve pressing member 122, the intake valve i25 opens the intake port 103in. Note that the adjustment pad 126 (gasket) is provided between the valve pressing member 122 and the intake valve 125, and adjusts the gap between the valve pressing member 122 and the intake valve 125. The exhaust valve 135 is urged by the valve pressing member 132 at a timing point in a manner similar to the intake valve 125 described above. An adjustment pad 136 (shield) is provided between the valve pressing member 132 and the exhaust valve 135, and adjusts a gap between the valve pressing member 132 and the exhaust valve 135. (3) Positional arrangement of the collar (restricting member) Fig. 5 is an enlarged plan view showing a part of the cylinder head 100'. In Figure 5, the board no is shown by a dashed line. As shown in Fig. 5, a collar 16 is disposed between the center wall 101 of the cylinder head iOOsh and the rocker arm 12''. The collar (10) abuts against one side 123 of the rocker 120. 128632.doc 200907163 The collar 170 is disposed between the sidewall 102 of the cylinder head i and the rocker arm 130. The collar 170 abuts one side 133 of the rocker arm 130. Two valve pressing members 122 are formed in the rocker arm 120. Therefore, the rocker ι2 〇 simultaneously pushes the two intake valves 125. Similarly, two valve pressing members 132 are formed in the rocker arm 130. Therefore, the rocker arm 130 simultaneously pushes the shape of the two exhaust valves 135 ° (4) collar

Figure 6 (a) is a plan view of the collar 160. Figure 6(b) is a side elevational view of the collar 16〇. Note that the 'loop n〇 has the same shape as the collar 16'. The collar 16 is made of metal. In this embodiment, the collar 160 is a sintered article, i.e., formed from a sintered alloy. As shown in Figure 6(a), the collar 160 has sides 161, 162. Side 161 abuts side 123 of rocker arm 120. In this embodiment, the side 161 forms a first side. Face 161 is opposite. The side 162 abuts the cylinder head against the center wall 1 〇 1. In this embodiment, the side 162 is positioned with the side 100h' and more specifically, the side 162 is formed - the second side is additionally formed by the bolt inserting hole 163 in the collar 160, that is, the plug 180 is further provided with a circular cross section. 164 is formed on the collar 160. The sleeve % 170 as described above has the same shape as the collar 16〇. Therefore, the rocker shaft 1 is inserted through the collar (10) and the rocker shaft 150 is inserted through the collar. The collar 170 is required to avoid disturbing the rocker arm 130 extending toward the side wall 102, and f wins a, (1) (see Fig. 5). Knots, sills; need to avoid interference with the valve extrusion member ° The circular section 164 is also formed on the collar 160 used with the collar 170. As shown in Figure 6(b), the collar 160 generally covers one half of the outer perimeter 140a of the rocker shaft 140. In other words, the collar 16〇 extends over substantially a range of 180 degrees centered on the central axis of the rocker shaft 14〇. The collar 160 has an inner side surface 160in' that abuts the outer periphery 14〇a of the rocker shaft 14〇 (see FIG. 7 in FIG. 6(b)) and the diameter direction of the rocker shaft 14〇. The inner side surface 16 〇in is closer to the outer side outer side surface 160out. The ferrule 160 has the following relationship with the rocker shaft 14 。. More specifically, when viewed from the axial direction of the rocker shaft 140, one end from the inner side surface i6〇in (and more specifically, from the inner end end 16b〇b) to the center of the inner side surface 16〇in The height H1 of C1 is greater than the height H2 from the center C1 of the inner side surface i6〇in to the center C2 of the outer side surface 160out. In addition, when viewed in the axial direction of the rocker shaft 140, the width wi from one end of the outer surface 160〇ut (ie, the 'outer end i6〇a') to the other end (ie, the outer end 160c) is greater than The diameter D of the rocker shaft 140. Further, when viewed in the axial direction of the rocker shaft 140, the height H3 from the outer surface 160〇ut outer end 16〇a to the center C2 is larger than the radius r of the rocker shaft 140. (5) Shape of the rocker shaft Fig. 7(a) is a side view of the rocker shaft 14A. Fig. 7 (15) is a plan view of the rocker shaft cut. Note that the rocker shaft 150 has the same shape as the rocker shaft 140. As seen in Figure 7(a), a through hole 141 having a generally circular cross section is formed in the rocker shaft 140. In other words, the rocker shaft 14 is cylindrical. Further, as seen in Fig. 7(b), 128632.doc 200907163, two screw holes 142, 143 are formed in the rocker shaft 14A. A bolt 180 (see Fig. 2) is screwed into the screw hole 142 and the collar 16 is fastened to the rocker shaft 140. As described above, the rocker shaft 14'' has the same shape as the rocker shaft 15''. Therefore, the same member can be used for the rocker shaft 140 and the rocker shaft 15A. The bolt 19〇 (see Fig. 2) is screwed into the screw hole 143' and the collar 170 is fastened to the rocker shaft 15〇 in the case where the member is used as the rocker shaft 150. f. Further, a notch 144 is formed in the rocker shaft HO. The shaft pressing member 11 0a of the plate i 1 is halved in the recess 144. (6) Shape of the board Fig. 8(a) is a plan view of the board 110. Figure 8(b) is a side view of the plate 11A. As shown in Figs. 8(a) and 8(b), the plate 11 has a shaft pressing member n〇a which prevents the rocker shafts i4, 15 from being disengaged from the cylinder head 100h. More specifically, the shaft pressing member 11〇3 is engaged with the notch 144 formed in the rocker shaft 140 (150). Further, an opening ll 〇 b is formed in the board 11 () to allow easy access to the swing i i ' 120, 130 and the collars 160, 170 and the like. (Operation and Advantages) In the engine 100, the collar 160 (170) is fastened to the rocker #axis 140 (150) by a screw (0). As a result, the collar 16 can be attached more reliably to the rocker shaft 140°. The collar 160 is tightly attached to one of the outer portions 140a of the rocker shaft 140. - The rocker that is rockably supported by the rocker shaft 140 Side 123 of 120. b Cocoa prevents the collar 160 fastened to the rocker shaft 140 by the bolt 180 from being detached from the rocker shaft 140. Therefore, it is not necessary to make the collar bendable as the known collar 128632.doc 16 200907163 described above. As a result, the thickness of the collar 160 in the diameter direction of the rocker axis i4〇 (i.e., the height H2) (see FIG. 6(b)) can be made larger than that of the known collar, thereby allowing the collar 160 to be The area of contact with the side 123 of the rocker arm 120 increases. If the contact area of the collar 160 with the side of the rocker arm 120 is increased, the surface pressure of the contact surface of the collar 丨6〇 and the rocker arm 120 is reduced, thereby improving the durability of the collar "o and the rocker arm 120. In this embodiment, the collar 160 (170) is fastened to the rocker shaft 14 (15 turns) by a bolt 180 (190) having an external thread formed therein. As a result, the collar 16 is attached to the rocker shaft 140. The removal of the collar 16 from the rocker shaft 14 is easy to perform. More specifically, the collar 16 can be removed, thus allowing the rocker arm 12 to be easily moved. Thus, the adjustment pad 126 (1 36) and The replacement of the analog can be easily performed. In addition, because the bolt 180 is screwed into the screw hole 142, the rocker shaft 140 can be prevented from being detached from the cylinder head. In this embodiment, the collar 16 ( 17〇) is made of a sintered alloy. As a result, the durability of the collar 16〇 is further improved as compared with when the collar is made of a resin. In this embodiment, the side of the collar 16〇 161 abuts the side 123 of the rocker arm 12 。. In addition, the side 162 positioned opposite the side 161 abuts against the wall 101 in the cylinder head 100sh. The rocker shaft 14 is supported by the cylinder head 1 and is more particularly supported by the center wall 1 〇 1 and the side wall 1 〇 2. Therefore, the rocker shaft 140 can be prevented from being disengaged from the cylinder head i 0 〇 sh (Other Embodiments) 128632.doc • 17· 200907163 In the above, the present invention is described as an example of a tribute to reveal the features of the present invention. However, it should be understood that the present day* > This description and the limitations of the drawings which form a part of this disclosure. It is to be understood by those skilled in the art that the present invention is susceptible to various modifications. For example, a collar can be used. The shape of the 16 〇〇 7 〇) is modified to the shape of the shape of the collar biliary as shown in Fig. 9. Fig. 9 is a side view of the collar 160V which can be used instead of the collar (10).

The " collar 16 0 extends over approximately the center of the rocker axis i 4 在 in the range of approximately i 8 〇. However, the collar 16GV extends in the range of less than (10) degrees with the center of the rocker. More specifically, as long as the durability of the collar 160V and the rocker arm 120 is maintained, the collar 16〇v does not need to extend over a range of approximately 180 degrees. In addition, the wall of the cylinder head l〇〇sh can extend to a point below the rocker shaft 14〇 and the bolt 180 that secures the collar 160 to the rocker shaft 140 can be screwed into the cylinder head 100h. Alternatively, instead of the bolts 1 80 ′ or a similar type thereof, the collar 16 6 can be fastened to the rocker shaft 140. The present invention includes various modified embodiments not described herein, as will be readily appreciated. Accordingly, the technical scope of the present invention is defined by the specific features of the invention as set forth in the appended claims. BRIEF DESCRIPTION OF THE DRAWINGS Fig. 1 is a side elevational view showing the overall outline of a structure including a four-stroke internal combustion engine @oscillating type bowing engine unit according to an embodiment of the present invention. 128632.doc -18- 200907163 Fig. 2 is a perspective view showing the outline of a cylinder of a four-stroke internal combustion engine according to this embodiment of the present invention. Figure 3 is a plan view of a cylinder head portion of a four-stroke internal combustion engine in accordance with this embodiment of the present invention. 4 is a cross-sectional view of the cylinder head portion of the four-stroke internal combustion engine taken along line F4_F4 of FIG. Figure 5 is an enlarged plan view showing a portion of a cylinder head portion of a four-stroke internal combustion engine according to this embodiment of the present invention.

Figures 6(a) and 6(b) show a plan view and a side view of one piece. Fig. 7 (a) and Fig. 7 (b) show a side view and a plan view. Fig. 80) and Fig. 8(b) show a side view and a side view. According to the embodiment of the present invention, the rocker shaft according to the embodiment of the present invention is flat according to the embodiment of the present invention.

Figure 9 is a side view of a restraining member according to the present invention - a description of the main component symbols. 10 Swing type engine single 100 engine 1 OOsh 汽虹头 101 Center wall 102 Side wall 1 〇3ex Exhaust port l〇3in Air inlet 128632.doc 200907163 104 Cylinder head cover 105 Camshaft 110 Plate 110a Shaft pressing member 110b Opening 111 Bolt 120 Rocker arm 121 Roller (' 122 Valve pressing member 123 Side 125 Intake valve 126 Adjustment pad 127 Intake cam 130 Rocker arm 131 Drum 132 & l'· Valve pressing member 133 Side 135 Exhaust valve 136 Adjustment pad 137 Exhaust cam • 140 Rocker shaft. 140a Outer periphery 141 Through hole 142, 143 Screw hole 128632.doc -20 - 200907163 144 150 160,160V 1 60a, 1 60c 160b 160in 1 60out 161, 162 163 164 170

180, 190 200 210 Cl, C2 D

HI to H3 R Notch Rocker shaft Collar Outer end Inner end Inner side Side 4th <Face Side Bolt insertion hole Round section Collar Bolt Drive Suspension member Center Diameter Grace radius 128632.doc -21 -

Claims (1)

200907163 X. Patent application scope: 1. A four-stroke internal combustion engine comprising: an intake and exhaust valve; a rocker arm that pushes the intake and exhaust valve at a timing point; and an insertion through the rocker arm a rocker shaft rotatably supporting the rocker arm, the four-stroke internal combustion engine comprising: a 'restriction member adjacent to the rocker arm, which limits the axial direction of the rocker arm The upper movement, and the solid member, which fastens the restraining member to the rocker shaft, wherein the restricting member abuts against a portion of one of the outer periphery of the rocker shaft and a side of the rocker arm. $ 2. The four-stroke internal combustion engine of claim 1, wherein the § hai restriction member has an inner side surface that abuts the outer periphery of the rocker shaft: by:: fixed: in the diameter direction of the rocker shaft The inner side surface is more sinful than the outer outer side surface, wherein when viewed from the axial direction of the rocker shaft, the height from one end to the center of the inner side surface is greater than the center of the surface surface to the outer side surface The height of the center of one of the inside and the inside of the w. 3. The four-stroke internal combustion engine as claimed in claim 4, wherein the restricting member has - the surface abutting the rocker shaft is positioned in the diameter direction of the rocker shaft (four) side surface closer to the outer side a surface, wherein the D" inner table is viewed from the axial direction of the rocker shaft from the end of the outer surface 128632.doc 200907163 to the outer diameter of the outer gamma. The width of the other end is greater than the rocker axis 4 · Female ° month 1 of the four-stroke internal combustion engine, which preferably has a - face, and -f sin the inner side of the outer periphery of the shaker shaft, sitting on the face of the rocker shaft : near the outer outer side surface, in the direction of the axial direction of the inner table of the cup axis as viewed - the height from one of the outer side surface - the outer side surface of the radius is greater than the rocker axis 5. 6. 8. 9. Rod structure: Item 4 of the four-stroke internal combustion engine 'where the fixing member is - screw as in request 5, in the shaft of the rod, and (4) ^ engine 'the screw hole is formed in the rocker , the screw member is screwed into the screw hole. An internal combustion engine, wherein the restriction member is made of gold as claimed in claim 7. The four-stroke internal combustion engine, wherein the restriction member is a burnt product. The request item 1 > the four-stroke internal combustion engine further comprises: a cylinder shaft supporting the rocker shaft, wherein the weir restricting member has a first side abutting one side of the rocker arm and a positioned fishing rod - a side opposite to the cylinder head Two sides 128632.doc