JPH0217129Y2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a support device for a rocker arm in a valve train of an engine, and particularly to a support device for a rocker arm that is swingably supported around a rocker shaft.

Many valve operating mechanisms for engines include a rocker arm that is swingably supported by a rocker shaft and is rocked by a cam, and the valves are opened and closed by vertical movement of the end of the rocker arm. In such a device, since a bending load is applied to the rocker shaft from the rocker arm, it is desirable that the rocker shaft bearings supporting the rocker shaft be provided at as short intervals as possible. Further, the rocker arm needs to be supported so as not to wobble in the lateral direction, that is, in the axial direction of the rocker shaft. For this reason, it is conceivable to support the rocker arm so that its both side surfaces are in contact with the end surfaces of the rocker shaft bearings located on both sides. however,
Since the Rotsuka arm is oscillated at high speed,
It must be ensured that no large frictional force is generated between the rocker arm and the rocker shaft bearing. Therefore, in order to support both sides of the rocker arm with rocker shaft bearings, the spacing between the bearings and the width of the rocker arm must be precisely finished, but such machining is very time-consuming. , the cost becomes high.

Therefore, when the rocker arm is supported between the bearings on both sides, a wave washer is interposed between the bearing and the rocker arm, and the wave washer is used to restrict the lateral movement of the rocker arm while supporting it swingably. It is possible to do so. However, the cam case in which the rocker shaft bearing is installed has a large number of machined parts, and the end face of the bearing may be shaved off due to the machining, resulting in insufficient contact surface with the wave washer. In such a case, as shown in FIG.
If it gets stuck in the locking arm 3, the elasticity of the wave washer will no longer work, and a lateral play r will occur in the locking arm 3. Furthermore, as shown in FIG. 1B, when the wave washer 1 is assembled upside down, the bearing end surface 2a comes into contact with the valley portion 1b, and the rocker arm 3 and wave washer 1
A gap r′ may occur between the two. Therefore, when assembling the wave washer 1 between such a bearing 2 and rocker arm 3,
The bearing end face 2a and the peak portion 1a of the wave washer 1 must be positioned and assembled so that they are in contact with each other, and the wave washer 1 must be prevented from rotating.

Moreover, when assembling such a wave washer, it is necessary to position the wave washer and the rocker arm between the rocker shaft bearings, align the wave washer and rocker arm with the center of the bearing, and then insert the rocker shaft from one side. There is. Therefore, the wave washer and rocker arm must be supported with one hand within the narrow space between the bearings, making this work extremely cumbersome.

The present invention was developed in view of the above-mentioned circumstances, and its purpose is to enable the wave washer to be easily and always assembled in an accurate position between the rocker arm and the rocker shaft bearing, and to Therefore, the rocker arm is to be supported without wobbling.

In order to achieve this purpose, the present invention provides a locking piece protruding from a part of the outer periphery of the wave washer, and provides an engaging portion on the locking shaft bearing or locking arm to which the locking piece is locked. There is.

Hereinafter, the present invention will be explained in more detail based on the drawings.

Figures 2 to 4 show an embodiment of the rocker arm support device according to the present invention. Figure 2 is a plan view of the main part of the engine valve mechanism equipped with the rocker arm support device, and Figure 3 is the same. The vertical sectional view and FIG. 4 are further exploded perspective views of the main parts thereof.

As is clear from FIGS. 2 and 3, the cam case 11 includes a plurality of rock shaft bearings 12, 1.
2,... are provided in series, and these bearings 1
2, 12, . . . support the rocker shaft 13. Between the bearings 12, 12,... are rocker arms 14, 14,..., respectively, located in their fitting holes 1.
By fitting the rocker shaft 13 to 4a, it is supported so as to be able to swing freely around the rocker shaft 13. An intake valve or an exhaust valve is engaged with the tips of these rocker arms 14, 14, . . . When the rocker arm 14 is swung by the rotation of the camshaft, the valve moves up and down. It is designed to open and close the intake port or exhaust port.

A wave washer 15 is mounted in a compressed state between one side surface of the rocker arm 14 and an end surface 12a of the bearing 12 facing thereto. As shown in FIG. 4, this wave washer 15 has a crest 15a in the center that extends vertically toward the bearing 12, and a general surface of the wave washer 15 is provided on the outer circumferential portion of the upper part of the ridge 15a. A locking piece 16 is formed by bending and protruding toward the bearing 12 at a substantially right angle therefrom. on the other hand,
A groove-shaped engagement portion 17 is formed on the upper surface of the bearing 12 to which the engagement piece 16 is engaged. The end face 12a of this bearing 12 has both sides cut off, and the center part is shaped to protrude toward the rocker arm 14 side. Wave washers 15
The peak portion 15a is in contact with the protruding end surface 12a of the bearing 12, and the hem portions 15b on both sides are in contact with the side surfaces of the rocker arm 14.

With such a configuration, the rocker arm 14
The compressive reaction force of the wave washer 15 pushes it toward the bearing 12 on the other side. Therefore, the rocker arm 14 is prevented from shaking in the lateral direction.
When the rocker arm 14 swings, the rocker arm 14 moves the wave washer 15 to the rocker shaft 13.
A force is applied around the wave washer 15 to gradually rotate it, but since the locking piece 16 formed integrally with the wave washer 15 is locked to the engaging portion 17 of the bearing 12, the rotation of the wave washer 15 is ensured. Prevented. Therefore, the wave washer 15
The peak portion 15a of the bearing 12 is kept in contact with the end face 12a of the bearing 12, and its elasticity can be exerted at all times.

When assembling such a wave washer 15 together with the rocker arm 14 between the bearings 12, 12, first the hem portion 1 of the wave washer 15 is assembled.
The wave washer 15 and the rocker arm 14 are supported with the rocker arm 5b in contact with the side surface of the rocker arm 14, and the peak portion 15a of the wave washer 15 is attached to the bearing 1.
The wave washer 15 is compressed and deformed by being brought into contact with the end surface 12a of the wave washer 15 and pressed by the rocker arm 14. Then, in that state, wave washer 15
and the rocker arm 14 are fitted between the bearings 12, 12. At this time, since the wave washer 15 can be supported by the locking piece 16, this operation can be easily performed.

Next, the wave washer 15 is attached to its locking piece 1.
6, and then move the locking piece 16 to the bearing 1.
2 to be locked by the engaging portion 17 of No. 2. In this state, the centers of the wave washer 15 and the bearing 12 coincide, and the peak portion 15a of the wave washer 15
contacts the end face 12a of the bearing 12 reliably. By doing so, it is possible to prevent the wave washer 15 from being assembled upside down.

Next, while holding the locking piece 16 of the wave washer 15 with your fingers to prevent it from coming off the engagement part 17 of the bearing 12, adjust the position of the locker arm 14 to align the center of the fitting hole 14a and the bearing 12. .

After aligning the centers of the rocker arm 14, wave washer 15, and bearing 12 in this way, the rocker shaft 13 is inserted from one side of the bearing 12. At this time, the wave washer 15 is supported by the bearing 12 in an accurate state by its locking piece 16, so there is no need to support it with your hands, and you only need to support the rocker arm 14 with your hands. The work will also become easier.

After completing the assembly of one set of rocker arm 14 and wave washer 15, the next bearing 12, 12
Locker arm 14 and wave washer 15 between
Assemble in the same way. In this way, sequentially,
The assembly is completed by assembling each rocker arm 14 and wave washer 15, and fitting the rocker shaft 13 into the bearing 12 at the end.

In the above embodiment, the crest 15a of the wave washer 15 is provided in the vertical direction; It is only necessary that the end surface 12a of the bearing 12 come into contact with the end surface 12a of the bearing 12 when
Depending on the location of a, the direction may be horizontal or diagonal. Also, bearing 1
The position of the engaging part 17 provided on the wave washer 15 can also be set to the most suitable position for the assembly work, and the position of the locking piece 16 of the wave washer 15 can also be determined depending on the position of the engaging part 17. determined.

The engaging portion 17 does not necessarily have to be groove-shaped as in the above embodiment, but may be a planar shape formed by scraping off a part of the outer surface of the bearing 12, or as shown in the figure. Wave washers 15
When the locking piece 16 is formed in a fork shape, it may be a protrusion that fits between the two fork pieces.

In some cases, the locking piece 16 of the wave washer 15 is made to protrude toward the rocker arm 14 side, and the locking piece 16 is locked to the engaging portion 17.
can also be provided on the rocker arm 14. Since the swinging angle of the rocker arm 14 is relatively small, if the end face 12a of the bearing 12 remains to a certain extent, even if the wave washer 15 swings together with the rocker arm 14, the peak portion 15a of the end face 12a of the bearing 12 It will never come off. By doing so, the wave washer 15 and the rocker arm 14 can be supported with one hand during assembly, which has the advantage of making the work easier.

Further, in the above embodiment, the wave washer 15 is provided only on one side of the rocker arm 14, but similar wave washers 15, 15 are installed between the bearings 12, 12 on both sides of the rocker arm 14, respectively. It is clear that this can also be done.

As described above, according to the present invention, since the lateral movement of the rocker arm is restricted by the wave washer, the distance between the rocker shaft bearings on both sides of the rocker arm can be reduced, and the distance between the rocker arm and the rocker shaft bearing can be reduced. The tolerance range for processing errors can be increased. A locking piece is provided on a part of the outer periphery of the wave washer, and an engaging part for locking the locking piece is provided on the bearing or locking arm, so the wave washer can be accurately positioned relative to the bearing and easily. In addition, it is possible to prevent the wave washer from rotating significantly due to the swinging of the rocker arm. Therefore, even when a large notch is provided in the end face of the bearing, the characteristics of the wave washer can always be utilized.

[Brief explanation of the drawing]

1A and 1B are explanatory diagrams for explaining the problems when assembling a normal wave washer between the rocker shaft bearing and the rocker arm;
The figure is a plan view of a main part of an engine valve mechanism showing an embodiment of a rocker arm support device according to the present invention;
FIG. 3 is a vertical sectional side view taken along the - line in FIG. 2;
FIG. 4 is an exploded perspective view of the main parts of the rocker arm support device. 11...Cam case, 12...Rock shaft bearing, 13...Rock shaft, 14...Rock arm, 15...Wave washer, 15a...
Mountain portion, 16...locking piece, 17...engaging portion.

Claims (1)

[Claims for Utility Model Registration] A rocker arm is swingably supported by a rocker shaft supported by a rocker shaft bearing whose end surface partially protrudes, and between the rocker arm and the rocker shaft bearing, A support device for a rocker arm in which a wave washer for regulating lateral movement is assembled; A locking piece protruding toward either side of the locking shaft bearing and the locking arm is provided in the locking section, and the crest of the wave washer is attached to the locking shaft bearing or the locking arm located on the protruding side of the locking piece. A support device for a rocker arm in a valve operating mechanism of an engine, wherein an engaging portion capable of locking a locking piece of the wave washer is formed at a position where the locking arm contacts a protruding end surface of the wave washer.