JP2532364Y2 - Roller nesting type rock arm - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field] The present invention relates to a technology related to a roller nesting rocker arm.

[Conventional technology]

There is a roller nesting rocker arm. Third
The figure is a longitudinal sectional view of a conventional roller nesting rocker arm.

In FIG. 3, 1 is a rocker arm main body, 2 is a roller, 3 is a cam, and 4 is an intake / exhaust valve. As shown in FIG. 3, the roller nesting type rocker arm is a roller 2 in which the cam 3 comes into contact with the cam 3 and the roller 2 is not rotatably supported by a shaft. It is designed to rotate inside.

Roller nested rocker arms are easier to manufacture and more durable than ordinary roller-type rocker arms in which rollers are supported by shafts, and have higher friction loss than roller-type rocker arms, but do not have rollers. There is an advantage that the friction loss is smaller than the rocker arm of the formula.

Prior art documents that disclose roller nesting rocker arms include, for example, Japanese Utility Model Laid-Open No. 58-53802 and Japanese Utility Model Laid-Open No. 60-15980.
5, 60-175803, 61-21804, and 61-
There are 57116.

[Problems to be solved by the invention]

The conventional roller nesting rocker arm has a complicated structure for holding the roller undetachably, for example, as shown in FIG. 4, such that the roller 2 is prevented from falling off in the axial direction by two C-shaped clips 9. As a result, there is a problem that production takes time.

Accordingly, a technical problem of the present invention is to facilitate the manufacture of the roller nesting rocker arm.

[Means for solving the problem]

In order to achieve this technical task, the following measures have been taken in the present invention. That is, a rocker arm body which abuts on the tip of the valve stem of the intake / exhaust valve to drive the intake / exhaust valve, and which is rotatably and nestably loosely fitted into a concave portion provided in the rocker arm body and has a camshaft cam. And a roller that contacts the
In a roller nested rocker arm in which both ends of the concave portion are closed by a stopper plate provided on the rocker arm main body and the roller is prevented from falling off in the axial direction by the stopper plate, the rocker arm is connected to the first member. The first member is formed by a second member.
A first concave portion is formed in the member, and the second concave portion is formed in the second member.
Is formed with a second concave portion, and the concave portion is provided with the first concave portion.
And the second recess, wherein the captive plate on one end is formed by a wall defining the first recess, and the captive plate on the other end defines the second recess. Sliding surfaces are formed in the first recess and the second recess, respectively, so as to slidably hold the roller over a circumferential length greater than half a circumference.

[Action]

According to the above means, the outer peripheral portion of the roller is supported by the sliding surface directly formed on the rocker arm main body itself, and the axial end portion of the roller is supported by the falling-off prevention plate provided on the rocker arm main body. In addition, a roller is set on a rocker arm formed by the first member and the second member, and a first recess formed on the first member and a second recess formed on the second member.
Are sandwiched by the second concave portions formed in the member. The sliding surface formed in the first concave portion and the second concave portion formed in the rocker arm slidably holds the roller over a length longer than half a circumference.

〔Example〕

FIG. 1 is a perspective view of a roller nesting rocker arm according to a first embodiment of the present invention.

In FIG. 1, 1 is a rocker arm main body, and 2 is a roller. Reference numeral 3 denotes a cam. The rocker arm body 1 is made by casting, and the roller 2 is made of steel. Arrow B is the direction of rotation of the cam 3.

The rocker arm main body 1 is provided with a through hole 11 through which a support shaft 19 that supports the rocker arm main body 1 so as to swing is formed. The rocker arm body 1 can swing as indicated by an arrow M with the support shaft 19 as a fulcrum.

A bolt hole 12 is formed at the tip of the rocker arm main body 1, and a bolt (not shown) that contacts the tip 18 of the valve stem of the intake / exhaust valve 4 is screwed into the bolt hole 12.

In FIG. 1, reference numeral 13 denotes a concave portion which accommodates the roller 2 rotatably. The roller 2 is rotatably loosely fitted in the recess 13. Since the opening of the recess 13 is small, the roller 2 does not fall off in the direction of arrow A. When the roller 2 is inserted into the recess 13, a part of the roller 2
Exposed to 13 openings. Roller 2 in such a part
Is in contact with the cam 3.

FIG. 2 is an exploded view of the roller nesting rocker arm of FIG.

As can be seen from FIG. 2, the rocker arm main body 1 is composed of a first rocker arm main body 61 and a second rocker arm main body 62 which are half-shaped. Reference numeral 2 denotes a roller, and reference numeral 11 denotes a through hole through which a support shaft (not shown) that supports the rocker arm main body 1 so as to swing is provided.

First rocker arm body 61 and second rocker arm body
62 is provided with a concave portion 13 for accommodating the roller 2.
The recess 13 does not penetrate, there is an end face 64,
First rocker arm body 61 and second rocker arm body 62
When this is adjusted, the end face 64 prevents the roller 2 from moving in the axial direction.

The end face 64 is naturally integral with the rocker arm main body 1 and corresponds to the falling-off prevention plate according to the present invention.

First rocker arm body 61 and second rocker arm body
The rocker arm main body 1 is completed by being made separately from 62 and machined with high precision. These are combined and welded by beam welding or the like. Beam welding has the advantage that it is very simple and generates little distortion. In addition, welding is also possible if it is a cast article of spheroidal graphite cast iron. Of course, the first rocker arm body 61 and the second rocker arm body 62 may be made of ordinary steel.

 The operation of the present embodiment will be described.

In the present embodiment, the roller 2 that prevents the roller 2 from falling off in the axial direction is, as described above, the end face of the first rocker arm main body 61 and the second rocker arm main body 62 (the drop prevention plate referred to in the present invention). ). In other words, in the present embodiment, the first rocker arm main body 61 and the second rocker arm main body 62 in a half-split shape are welded together to form the rocker arm main body 1, and the roller 2 naturally falls off in the axial direction. Can be prevented.

Thus, according to the present embodiment, since the structure for holding the roller 2 so as not to fall off is very simple, the manufacture of the roller nesting rocker arm becomes very easy.

Also, in a normal roller type rocker arm, a concentrated load is applied to the roller shaft, but according to the present embodiment, the roller 2 abuts on the rocker arm body 1 with a very large area, and therefore the concentrated load is not applied. Can be made of inexpensive materials, or can be made of fine ceramics such as silicon nitrite or sintered metal. Further, since a concentrated load is not applied, the rocker arm main body 1 can be made of an inexpensive material.

Further, since a solid roller 2 can be used as compared with a roller-type rocker arm supporting the roller with a bearing, the cost is reduced, and the number of parts is reduced because a shaft for supporting the roller 2 is unnecessary. .

Thus, according to the present embodiment, since the structure for holding the roller 2 so as not to fall off is very simple, the manufacture of the roller nesting rocker arm becomes very easy.

The specific embodiment of the present invention has been described above. However, the present invention is not limited to this embodiment, and includes various embodiments within the scope of the claims for utility model registration.

[Effect of the invention]

According to the present invention, since no separate member is interposed between the rocker arm and the roller, it is not necessary to consider both the accuracy of the rocker arm and the separate member and the accuracy of the separate member and the roller as in the related art. Only the accuracy between the roller and the roller need to be considered. In addition, the rocker arm is connected to the first member and the second member.
Since the rocker arm slides with the roller, the number of parts is reduced and the number of working steps is reduced.

[Brief description of the drawings]

FIG. 1 is a perspective view of a roller nesting rocker arm according to a first embodiment of the present invention, FIG. 2 is an exploded view of the roller nesting rocker arm of FIG. 1, and FIG. FIG. 4 is a longitudinal sectional view of a mechanism used in a conventional roller nesting type rocker arm for preventing a roller from falling off in the axial direction. 1 Rocker arm body 2 Roller 3 Cam 4 Inlet / exhaust valve 13 Recess 64 End face (fall-out prevention plate)

Claims (1)

(57) [Scope of request for utility model registration] 1. A rocker arm body for abutting against a tip of a valve stem of an intake / exhaust valve to drive the intake / exhaust valve, and a cam rotatably and nestably fitted into a recess provided in the rocker arm body. The cam of the shaft is in contact with a roller, and both ends of the concave portion are closed by a stopper plate provided on the rocker arm body, and the roller is prevented from falling off in the axial direction by the stopper plate. In the roller nesting rocker arm, the rocker arm is formed by a first member and a second member, wherein the first member has a first recess, and the second member has a second recess. Is formed, the concave portion is composed of the first concave portion and the second concave portion, and the falling-off prevention plate on one end side is a wall portion defining the first concave portion. And the fall prevention plate at the other end is formed by a wall defining the second recess, and the first recess and the second recess each have the circumferential length of the roller larger than half a circumference. A roller nesting rocker arm, wherein a sliding surface for slidably holding is formed.