JPH0422003Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to an elastic member for positioning a rocker arm supported by a rocker shaft to open and close an intake valve and an exhaust valve.

[Prior Art] In a valve mechanism that opens and closes intake and exhaust valves via a Rockscar arm, a camshaft that is linked to a crankshaft is placed at the top of the engine, and a Rockscar shaft is installed parallel to this camshaft. I have to. The rocker shaft supports the same number of rocker arms as the intake and exhaust valves, and each rocker arm is swung by a cam provided on the camshaft to open and close the intake and exhaust valves. In addition, an elastic member having an elastic force in the axial direction is interposed between the rocker arm and a shaft support such as a cylinder head that pivotally supports the rocker shaft, or between the rocker arms, so that the axial direction of the rocker arm corresponding to each cam is interposed between the rocker arm and the rocker arm. Normally, the proper position is maintained. As this type of elastic member, for example, as shown in Japanese Utility Model Application Publication No. 59-40506, a cylindrical elastic member having elastic force in the radial and axial directions of the rocker shaft is used between the shaft support of the rocker shaft and the rocker arm. Forcibly fit on the outer circumference of the rocker shaft,
There is one that restricts the axial positional movement of the rocker arm.

There is also a device in which a member having elastic force in the axial direction is interposed between the rocker arms to bias the rocker arm in the axial direction, and this member is bolted to the rocker shaft.

[Problems to be solved by the invention] However, as shown in the prior art, the rocker arm is urged in the axial direction by interposing a cylindrical elastic member between the rocker arm and its shaft support or between the rocker arms. In the case where the rocker arm is tilted, both edges thereof come into contact with the end face of the rocker arm or the end face on the shaft support side. Therefore, as the Rotsker arm swings,
There is a high possibility that both edge portions of the elastic member will wear out relatively early, and there is a problem in durability. Moreover, a simple cylindrical member that is forcibly fitted onto the outer periphery of the rocker shaft is difficult to remove for maintenance and inspection, which poses a problem in terms of workability.

Further, in the case where the elastic member is bolted to the rocker shaft, it is necessary to form a threaded portion for screwing the bolt onto the rocker shaft, and the work of attaching and removing the elastic member is inconvenient.

It is an object of the present invention to provide an elastic member for positioning a rocker arm that improves the above-mentioned problems and has excellent durability and ease of attaching and detaching the elastic member.

[Means for Solving the Problems] In order to achieve the above object, the present invention provides a shaft clamping portion that has an opening portion and is attached to the outer periphery of a rocker shaft using elastic deformation in the radial direction, and a protruding part formed in a rectangular cross-section by protruding the proximal end side of the part opposite to the opening in a direction away from the rocker shaft; and a collar part that is connected to both side edges of the protruding part and can be elastically deflected in the axial direction. The rocker arm is characterized in that at least one of the collar portions is brought into elastic surface contact with the end surface of the rocker arm.

[Function] According to such a configuration, when installing the elastic member, by pressing the protrusion formed on the opposite side of the shaft holding part toward the rocker shaft, the opening formed on the opposite side From this point on, a shaft clamping portion is attached to the outer periphery of the rocker shaft. The elastic member is supported on the outer periphery of the rocker shaft by the radial elastic force of the shaft holding portion, and at least one of the flanges connected to both side edges of the protruding portion is in surface contact with the end surface of the rocker arm, The rocker arm is axially biased to maintain its proper position.

On the other hand, when removing the elastic member, the protrusion can be easily removed by, for example, pinching and pulling, which simplifies the work.

Furthermore, since the protrusion has a rectangular cross section with the proximal end of the shaft clamping part protruding away from the rocker shaft, by changing the length of both side edges of the protrusion, The width of the collar part connected to the edge can be easily changed. Therefore, it becomes easier to adjust the elastic force in the axial direction in the flange portion, and it becomes easier to set the elastic force to an appropriate value.

[Embodiment] An embodiment of the present invention will be described below with reference to FIGS. 1 to 3.

Figure 1 schematically shows the upper part of an automobile engine with one cylinder, two intake valves, and two exhaust valves. This shows the camshaft that rotates in conjunction with the camshaft. The camshaft 1 is rotatably supported by shaft supports 2a and 2b provided at both ends of the cylinder head and between each cylinder, and between the shaft supports 2a and 2b are two intake valves 3a and 3b for opening and closing. intake cam 4
a, 4b, and a single exhaust cam 6 located between both cams 4a, 4b to open and close the two exhaust valves 5a, 5b.

Above both sides of the camshaft 1, rocker shafts 7 and 8 on the intake side and the exhaust side are arranged in parallel. Each rocker shaft 7, 8 is supported by the shaft supports 2a, 2b in the same manner as the camshaft 1, and between the shaft supports 2a, 2b, the rocker shaft 7 on the intake side is supported by the intake cams 4a, 4b.
Two rocker arms 9a and 9b corresponding to the exhaust cam 6 are supported near the shaft supports 2a and 2b, and two rocker arms 10a and 10b corresponding to the exhaust cam 6 are swingably supported on the exhaust side rocker shaft 8 toward the center. has been done. As the camshaft 1 rotates, each rocker arm 9a, 9
b, 10a, 10b are the corresponding cams 4a, 4b,
6 to push down the stem heads of the intake valves 3a, 3b and exhaust valves 5a, 5b.
a, 3b, 5a, and 5b are set to open.

On the other hand, the rocker arms 10a and 10b on the exhaust side
A wave washer 11 is interposed on the outer periphery of the rocker shaft 8 between the rocker shafts 8 and 11. The wave washers 11 abut against the end faces 10c and 10d of the rocker arms 10a and 10b, respectively, so as to urge the rocker arms 10a and 10b in opposite directions.

On the other hand, an elastic member 12 is provided on the outer periphery of the rocker shaft 7 between the rocker arms 9a, 9b on the intake side to hold these rocker arms 9a, 9b in proper positions. The elastic member 12 includes a shaft holding part 13 attached to the outer periphery of the rocker shaft 7 on the intake side, a protrusion 14 formed to protrude in the centrifugal direction, and both side edges 14b, 14 of the protrusion 14.
c and a flange portion 15 connected to the flange portion 15.

The shaft holding part 13 has a cylindrical shape that can be elastically deformed in the radial direction, and is adapted to be attached to the outer periphery of the rocker shaft 7 by utilizing its elastic force. An opening portion 13a smaller than the diameter of is formed.

The protruding part 14 is formed in a rectangular cross-section so as to protrude toward the proximal end of the shaft holding part 13 in a direction away from the rocker shaft 7 on the opposite side of the opening part 13a, and its outer end surface 14a is parallel to the axial direction. It is as follows.

Then, both side edges 14b, 14 of this protrusion 14
The brim portions 15 formed as a pair in c are
It is formed to be elastically deflectable in the axial direction, and its base ends 15a and 15b are connected to the outer end surface 14 of the protrusion 14.
an engaging end 15c, which is formed in a plane perpendicular to point a, and whose terminal end is curved from the outer side toward the rocker shaft 7 on the intake side, and whose tip side engages the rocker arms 9a and 9b on the intake side;
15d. The engaging ends 15c and 15d are formed in a semicircular arc shape corresponding to the outer circumference of the rocker shaft 7, and a sliding surface 15e is provided near the tip of each of the engaging ends 15c and 15d to make sliding contact with the inner end surfaces 9c and 9d of the rocker arms 9a and 9b on the intake side. , 15f, and further,
The tip thereof is located at both side edges 13 of the shaft holding portion 13.
It has a slightly bent shape toward b and 13c.

The elastic member 12 having such a configuration is attached, for example, as follows. When the opening part 13a of the shaft clamping part 13 is applied to the outer periphery of the rocker shaft 7 between the rocker arms 9a and 9b on the intake side, and a pressing force is applied to the protrusion part 14 on the side opposite to the opening part, the shaft clamping part 13 is elastically deformed. The shaft holding portion 13 is forcibly encircled and supported around the outer periphery of the rocker shaft 7. When the elastic member 12 is attached, the elastic force in the axial direction of the collar 15 causes
Sliding surfaces 15 formed on each engaging end 15c, 15d
e, 15f to each rocker arm 9a, 9 on the intake side.
Each rocker arm 9a, 9b is biased from above and below along the rocker shaft 7 in the opposite direction, in other words, in the direction of the adjacent shaft supports 2a, 2b, while bringing them into elastic surface contact with the inner end surfaces 9c, 9d of the rocker shaft 7. and hold it in place.

On the other hand, when removing the elastic member 12, the shaft holding part 13 is removed from the outer periphery of the rocker shaft 7 by, for example, holding and pulling the protruding part 14.

In this way, in the elastic member 12 according to the present invention,
Not only is the elastic member 12 forcibly fitted to the outer periphery of the rocker shaft 7 using the elastic force in the radial direction of the shaft clamping part 13, but also the projection part 14 is formed by making the shaft clamping part 13 protrude in the centrifugal direction. At the same time, both side edges 14b, 1 of this protrusion 14
A collar portion 15 is connected to 4c. Therefore, when the elastic member 12 is in the attached state, elastic force in the axial direction is exerted over a long period of time by the proximal end portions 15a and 15b of the curved brim 15, so that the central portion of the cylindrical member Compared to a normal elastic member that has a notch and applies elastic force in the axial direction,
The proper positions of the rocker arms 9a, 9b can be maintained for a long period of time.

Moreover, sliding surfaces 15e and 15f are formed on the parts that engage with the rocker arms 9a and 9b, so that they are brought into surface contact with the inner end surfaces 9c and 9d of the rocker arms 9a and 9b to the extent that no frictional resistance occurs. This is advantageous in terms of durability since the engaging portions with the rocker arms 9a and 9b do not wear out prematurely.

In addition, since a protruding part 14 is formed on the opposite side of the shaft holding part 13 to serve as a knob part, compared to conventional elastic members that do not have a similar protruding part or are bolted to the rocker shaft. As a result, the workability of attaching and detaching it is improved.
That is, the opening portion 13a of the shaft holding portion 13
is applied to the outer periphery of the rocker shaft 7 and a pressing force is applied to the protrusion 14 to release the elastic member 1.
2 can be attached to the rocker shaft 7,
By pulling the protrusion 14, it can be easily removed. Therefore, it does not take much time to attach or detach the elastic member 12, and moreover, it can be attached or detached with one hand.

Further, the protruding portion 14 is connected to the shaft holding portion 1
3 has a proximal end protruding in the direction away from the rocker shaft 7 and has a rectangular cross section.
By changing the length dimension (vertical dimension in FIGS. 2 and 4) of both side edges 14b, 14c, the width of the collar 15 connected to both side edges 14b, 14c can be changed without difficulty. I can do it. Therefore, the elastic force in the axial direction of the flange portion 15 can be easily adjusted, and the elastic force can be easily adjusted to an appropriate value. Therefore, with such a structure, it is possible to bring the collar portion 15 into elastic contact with the inner end surfaces 9c, 9d of the rocker arms 9a, 9b with appropriate elastic force, and the rocker arms 9a, 9b can be used for a long period of time. It can be held in an appropriate position over the entire period, and the rocker arms 9a, 9
It is possible to effectively suppress the occurrence of wear between b and the flange portion 14.

Further, since the elastic member 12 is attached to the rocker shaft 7 by utilizing elastic deformation in the radial direction, it can be displaced in the axial direction. With such a structure, if the elastic contact force between the collar portion 15 and the rocker arms 10a, 10b is different on the left and right sides, this elastic member 12 will be displaced in the axial direction. It is possible to equalize the elastic contact force, and it is also possible to prevent uneven wear and the like.

In the above embodiment, the elastic member according to the present invention is interposed between the rocker arms on the intake side, and one collar of the elastic member is brought into elastic surface contact with the end face of a single rocker arm to form a rocker arm. Alternatively, if the rocker arms on the exhaust side are spaced apart from each other, the rocker arms can be placed at that location. Further, the shape of the flange portion is a preferred example of exerting elastic force in the axial direction, and it goes without saying that the present invention is not necessarily limited to the shape shown in the drawings.

[Effects of the invention] As detailed above, in the present invention, a protrusion is formed on the shaft clamping part that is elastically deformed in the radial direction, and collars that are elastically displaceable in the axial direction are connected to both side edges of this protrusion. The flange is placed in elastic surface contact with the end face of the Rocker arm.
The Rocker Arm, which engages with the flange, can be maintained in the proper position for a long period of time, and the durability of the flange is improved.Furthermore, by using the protruding part, the Rocker Arm can be easily attached and detached. A positioning elastic member can be provided.

That is, according to the present invention, the elastic member can be attached to the rocker shaft by a simple operation of applying a pressing force or a tensile force to the protrusion,
Alternatively, since it can be removed from the rocker shaft, it can be attached and detached with one hand like a clip or the like, and the attachment and detachment work does not take much time.

Furthermore, since the protruding part is formed to protrude in a direction away from the rocker shaft and has a rectangular cross section, by changing the length dimension of both side edges, the width of the brim part connected to both side edges can be adjusted. It can be changed without difficulty, and the elastic force in the collar can be easily adjusted. Therefore, with such a structure, it is possible to bring the flange into elastic contact with the end face of the rocker arm with appropriate elastic force, and it is possible to hold the rocker arm in an appropriate position, and also to make the rocker arm and the flange contact each other. It is possible to effectively suppress the occurrence of wear during the process.

Furthermore, compared to something that is fixed to the rocker shaft with bolts, the elastic contact force on the left and right ribs can be made equal, so it is also possible to effectively prevent uneven wear and the like.

[Brief explanation of the drawing]

1 to 4 show an embodiment of the present invention,
Figure 1 is a schematic plan view showing the upper part of the engine;
The figure is a sectional view taken along the - line in Fig. 1, Fig. 3 is a plan view showing the main parts, and Fig. 4 is a - line in Fig. 3.
FIG. 1...Camshaft, 3a, 3b...Intake valve,
5a, 5b... Exhaust valve, 7, 8... Rocker shaft, 9a, 9b... Rocker arm, 9c, 9
d...Inner end surface, 10a, 10b...Rocker arm, 12...Elastic member, 13...Shaft holding part, 13a...Opening part, 14...Protrusion part, 14
b, 14c...Side edge, 15...Brim part, 15e,
15f...Sliding surface.

Claims (1)

[Scope of utility model registration request] A shaft clamping part that has an opening and is attached to the outer periphery of the rocker shaft using elastic deformation in the radial direction, and a part opposite to the opening, which is the proximal end of this shaft clamping part, protrudes in a direction away from the rocker shaft to form a rectangular cross section. It has a protruding part formed in the shape of a shape, and a collar part which is connected to both side edges of the protruding part and can be elastically deflected in the axial direction. An elastic member for positioning a rocker arm, characterized in that the elastic member is brought into contact with each other.