JPH0564403U - Valve lifter for valve - Google Patents

Abstract

(57) [Summary] (Correction) [Purpose] To provide a valve lifter for a valve that is easy to assemble and can prevent rotation of an adjusting shim during operation of an internal combustion engine. [Structure] A concave portion 9 is formed on the surface of a crown surface portion 6a of a valve lifter body 6, and a non-circular through hole 8 that opens into the concave portion 9 is bored in the center portion of the crown surface portion 6a. , Fit the inner shim 7B that contacts the valve 2,
An outer shim 7A that comes into contact with the cam 1 is formed integrally with the inner shim 7B.
Fitted inside.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a valve lifter for a valve which is fitted in a head cylinder bore of an internal combustion engine and reciprocally slides in the head cylinder bore according to rotation of a cam shaft while contacting a valve stem of an intake / exhaust valve. ..

[0002]

[Prior Art]

 Conventionally, a valve lifter for this type of valve has been disclosed in, for example, Japanese Utility Model Laid-Open No. Sho 62-188505. In this valve lifter for valve operation, as shown in FIG. 6, a recess 21 is formed in the surface of the crown portion 20a of the valve lifter body 20 made of a light metal material such as an aluminum alloy, and in this recess 21, an iron contacting the cam 22 is formed. An outer shim 23 made of a metallic material of the system is fitted. Further, a recess 24 is formed on the back surface of the crown surface 20a, and an inner shim 26 made of an iron-based metal material that is in contact with the valve 25 (the valve stem of the intake / exhaust valve) is fitted into the recess 24. The peripheral wall portion 20b forming the concave portion 24 of the crown surface portion 20a is fixed by caulking. Furthermore, for removing the outer shim 23, the valve lifter body 20 is provided with a small hole 27 extending from the side surface thereof to the bottom surface of the recess 21.

[0003]

[Problems to be solved by the device]

 However, in the above-mentioned conventional valve lifter for valve, the outer shim 23 and the inner shim 26 are used as the adjustment shims for adjusting the valve clearance, and the number of parts is large. In addition, the inner shim 26 must be installed in the recess 24 inside the valve lifter body 20, and the assembling work is not easy. Further, the inner shim 26 was fitted in the recess 24, and then the peripheral wall portion 20b was swaged to be fixed in the recess 24. However, the outer shim 23 is simply fitted in the recess 21. Therefore, during operation of the internal combustion engine, the outer shim 23 rotates in the recess 21, and the outer peripheral surface of the outer shim 23 and the inner peripheral surface of the peripheral wall portion 20c forming the recess 21 slide and wear. There was a problem.

The present invention has been made to solve the above-mentioned conventional problems, and an object thereof is to provide a valve lifter for a valve that is easy to assemble and can prevent rotation of an adjusting shim during operation of an internal combustion engine.

[0005]

[Means for Solving the Problems]

 In order to achieve the above-mentioned object, the valve lifter for a valve according to the present invention has a concave portion formed on the surface of the crown portion of the valve lifter body, and a non-circular through hole opening in the concave portion is formed in the central portion of the crown portion. The inner shim that comes into contact with the valve is fitted into the through hole, the outer shim that comes into contact with the cam is formed integrally with the inner shim, and the outer shim is fitted into the recess. It is a thing.

[0006]

[Action]

 With the above configuration, the adjustment shim is a shape in which the inner shim is integrated with the outer shim. By fitting the inner shim part of this adjusting shim into the through hole provided in the center of the crown surface and fitting the outer shim part into the recess provided in the surface of the crown surface, the valve shim of the valve lifter Assembly is complete. Since the through hole has a non-circular shape and the inner shim portion is fitted in the through hole, the adjusting shim does not rotate during operation of the internal combustion engine.

[0007]

【Example】

 An embodiment of the present invention will be described below in detail with reference to FIGS.

FIG. 1 is a sectional view showing a valve operating mechanism, FIG. 2 is a longitudinal sectional view showing an unused state of the valve lifter body in FIG. 1, FIG. 3 is a plan view of FIG. 2, and FIG. FIG. 5 is a plan view of FIG. 4 showing the valve lifter.

In the figure, 1 is a cam shaft, 1 a is a cam formed on the cam shaft 1, 2 is a valve (only the valve stem of an intake / exhaust valve is shown), 3 is a valve spring, and 4 is an upper end of the valve spring 3. The retainer 5 is a cotter for fixing the retainer 4 to the upper end of the valve stem 2, 6 is a valve lifter body, and 7 is an adjustment shim mounted between the cam 1 and the valve lifter body 6 for adjusting the valve gap.

The valve lifter body 6 is made of a light metal material such as an aluminum alloy. A non-circular through hole 8 such as an ellipse is bored in the center of the crown surface portion 6a, and a circular surface is formed on the surface of the crown surface portion 6a. A recess 9 is formed.

The adjusting shim 7 is made of an iron-based metal material, and is formed by integrally forming an outer shim 7A having a circular cross section and an inner shim 7B having a non-circular cross section corresponding to the shape of the through hole 8 described above. The inner shim 7B is fitted in the through hole 8 provided in the center of the crown surface 6a, and the outer shim 7A is fitted in the recess 9 provided on the surface of the crown surface 6a. The peripheral wall 6b forming the recess 9 is fixed by caulking. As shown in FIG. 5, caulking of the peripheral wall portion 6b is performed by forming caulking portions 6c on the inner periphery of the peripheral wall portion 6b at substantially equal intervals.

Then, the valve lifter body 6 is fitted in the head cylinder bore 10 of the internal combustion engine, the valve 2 is brought into contact with the inner shim 7B portion of the adjusting shim 7 by the urging force of the valve spring 3, and the cam 1a. The outer shim 7A portion of the adjusting shim 7 is brought into contact with.

In the valve mechanism constructed as described above, first, while fitting the inner shim 7B portion of the adjustment shim 7 into the through hole 8 of the valve lifter body 6, the outer shim 7A portion is recessed in the valve lifter body 6. After fitting the inside of the valve 9, the peripheral wall portion 6b is pressed and tightened to complete the assembly of the valve lifter.

The through hole 8 is formed in a non-circular shape in the center of the crown surface portion 6a of the valve lifter body 6, and the inner shim 7B portion of the adjusting shim 7 is fitted in the through hole 8, The outer shim 7A of the adjusting shim 7 does not rotate in the recess 9 during operation of the internal combustion engine.

[0015]

[Effect of the device]

 As described above, according to the present invention, a concave portion is formed on the surface of the crown surface portion of the valve lifter body, a non-circular through hole that opens into the concave portion is formed in the center portion of the crown surface portion, and the valve is provided in the through hole. The inner shim that comes into contact with the cam is fitted, and the outer shim that comes into contact with the cam is formed integrally with this inner shim, and this outer shim is fitted into the recess. Since it is integrally formed, the number of parts can be reduced. Also, since the valve shim is assembled by fitting the inner shim part and the outer shim part of the adjusting shim into the through hole and the concave part of the valve lifter body respectively, the assembling work can be performed easily and quickly. Furthermore, the inner shim part of the adjusting shim is fitted in the non-circular through hole, and the outer shim part of the adjusting shim does not rotate during the operation of the internal combustion engine. Since the inner peripheral surface of the peripheral wall forming the recess does not slide and wear, the wear resistance of the valve lifter can be improved without impairing the valve gap adjusting function of the adjusting shim.

[Brief description of drawings]

FIG. 1 is a sectional view showing a valve mechanism which is an embodiment of the present invention.

FIG. 2 is a vertical cross-sectional view showing an unused state of the valve lifter body in FIG.

FIG. 3 is a plan view of FIG.

FIG. 4 is a vertical cross-sectional view showing the valve lifter in FIG.

FIG. 5 is a plan view of FIG.

FIG. 6 is a vertical sectional view showing a valve mechanism of a conventional example.

[Explanation of symbols]

 1 cam 2 valve 6 valve lifter body 6a crown surface part 6b peripheral wall part 6c crimping part 7 adjustment shim 7A outer shim 7B inner shim 8 through hole 9 recess

Claims (1)

[Scope of utility model registration request] 1. A concave portion is formed on the surface of a crown surface portion of a valve lifter body, and a non-circular through hole that opens into the concave portion is formed in the center portion of the crown surface portion, and a valve is contacted in the through hole. A valve lifter for a valve valve, characterized in that an inner shim is fitted, an outer shim with which a cam abuts is integrally formed with the inner shim, and the outer shim is fitted in the recess.