JPH0220414Y2 - - Google Patents

Description

[Detailed description of the invention] [Object of the invention and its field of application] The invention has one end that abuts a cam assembled to the engine block, and the other end that abuts a valve that is assembled to the engine block. This invention relates to an improvement of a rocker arm device in which a rocker arm supporter is assembled to an engine head, and is particularly used in engines having a pressure-feed type latch adjuster in the supporter portion.

[Prior art]

As a prior art related to the present invention, JP-A-58-
There is one published in No. 180709. As shown in Fig. 4, the pressure-feed type latch adjuster 14 that controls the valve lift operation of the variable cylinder engine is integrated with the supporter 13 of the rocker arm 12, and is fitted into the cylinder 11a of the engine head 11, and a stopper is installed. After the supporter 13 is locked to prevent it from falling off the cylinder 11a at 15, the engine head 11 is attached to the engine block 16.

[Problems with conventional technology and their technical analysis]

However, this conventional technique has the following problems. That is, due to the shape of the rocker arm 12, the valve contact portion 12a at the other end is heavier than the cam contact portion 12c at one end, and when it is attached to the engine block 16, the valve contact portion 12a is lowered more than necessary. , the valve contact portion tip 12b comes off from the tip 17a of the valve 17 and does not match. For this reason, it was necessary to attach the valve contact portion 12a while holding it down with a jig such as a tongue piece so that the valve contact portion 12a does not go down more than necessary.

[Technical issues]

Therefore, the present invention prevents the valve abutting part 12a from lowering more than necessary without using a jig such as a tongue, so that the tip 12b of the valve abutting part can be moved from the position of contact with the tip 17a of the valve. Make sure it doesn't come off,
Easily attach engine head 11 to engine block 1
The technical challenge is to make it possible to attach it to the 6.

[Technical means and their effects]

The technical measure taken to solve the above problem is that when the engine head is attached to the engine block, when the rocker arm rotates beyond the range of rotation that follows the rotation of the cam, the other end of the rocker arm will not touch the valve. A stopper is provided between the rocker arm and the supporter to restrict rotation of the rocker arm so that it does not come out of the contact position.

This prevents the rocker arm from lowering more than necessary even if the valve abutting portion is heavy, and the tip of the abutting portion aligns with the valve tip without coming off, allowing the engine head to be easily attached to the engine block.

[Special effects]

The present invention has the following unique effects. That is,
It is also possible to attach the engine block after assembling the supporter to the engine block side as in a general engine type. However, when installing the engine head, the latch adjuster integrated with the support must be inserted into the cylinder of the engine head, and since there are multiple latch adjusters and cylinders, it is difficult to insert and insert due to misalignment. It's a hassle.

In contrast, the device of the present invention can be easily installed by simply providing a stopper.

〔Example〕

Examples of the present invention will be described below.

In FIG. 1, a pressure-feed type latch adjuster 24 is fitted into a cylinder 21a formed in an engine head 21, and a rocker arm 2 is attached to the lower end of the cylinder 21a.
A supporter 23 that supports 2 is integrally fixed. 25 is a retainer and is attached to the engine head 21.
This prevents the supporter 23 from coming off when it is attached to the engine block 26. The rocker arm 22 has a contact portion 22c that contacts a cam 28 assembled to the engine block 26 at one end, and a valve 22c at the other end.
A contact portion 22a having a tip portion 22b that comes into contact with the tip portion 27a of No. 7 is formed. Between the supporter 23 and the rocker arm 22, there is a stopper pin 30 driven into the supporter 23.

In the installed state as shown in FIG. 1, the clearance m between the stopper pin 30 and the vertically lower rocker arm 22 is set as follows. The cam 28 has a constant surface A and a protruding surface B, and the stroke difference between the two is l.The rocker arm point directly below the stopper pin 30 when the cam contact portion 22c of the rocker arm is in contact with the constant surface is C, the cam contact point. Let D be the rocker arm point directly below the stopper pin 30 when the contact portion 22c contacts the protruding surface B and the rocker arm 22 rotates by an angle θ corresponding to the stroke difference l. If the distances between the rotation center point O of the rocker arm 22 and the above-mentioned points C and D are r and s, respectively,
If s-r<m, the rocker arm 22 will not come into contact with the stopper pin 30 regardless of the movement of the cam 28. Consider a position E that is rotated by a small amount δ from the above θ, and if the distance from O is t, then t-
If r≧m, the rocker arm 22 contacts the stopper pin. In this way, if the locker arm 22 does not come into contact with the stopper pin 30 within the range of rotation due to the stroke of the cam 28, but contacts the stopper pin 30 at a position slightly beyond this range of rotation, the tip 22b of the valve contact portion The engine head 21 can be easily attached to the engine block 26 without being extremely detached from the valve tip 27a.

The stopper pin 30 is, for example, a spring pin,
A solid pin or a hollow pin that can be press-fitted into the engine head 21 may be used, or the engine head 21 may be threaded and a bolt or screw may be used.

Further, as shown in FIG. 2, a hole may be provided in the rocker arm 22, and the aforementioned stopper pin 30 may be press-fitted or screwed into the hole.

Furthermore, as shown in FIG. 3, the stopper protrusion 30' may be integrally molded when the rocker arm 22 is molded.

[Brief explanation of the drawing]

FIG. 1 is an embodiment of the present invention, FIGS. 2 and 3 are main parts of other embodiments of the present invention, and FIG. 4 is a conventional explanatory diagram of the present invention. 22...Lotsuka arm, 23...Supporter, 3
0,30'...Stoppa.

Claims (1)

[Scope of utility model registration request] In a rocker arm device, a rocker arm supporter is assembled to an engine head, the supporter of the rocker arm having one end abutting a cam assembled to the engine block and the other end abutting a valve assembled to the engine block. When attached to the engine block, when the rocker arm rotates beyond the range of rotation that follows the rotation of the cam, the rocker arm is installed so that the other end of the rocker arm does not come out of contact with the valve. A rocker arm device comprising a stopper provided between the rocker arm and the supporter to restrict rotation of the rocker arm.