JPS63158502U

JPS63158502U -

Info

Publication number: JPS63158502U
Application number: JP4994587U
Authority: JP
Priority date: 1987-04-03
Filing date: 1987-04-03
Publication date: 1988-10-18

Description

[Brief explanation of the drawing]

第１図は本考案の実施例の縦断面図、第２図は
同上実施例におけるシムの上面図、第３図は第１
図のＣ部の拡大図、第４図は同上実施例における
バルブリフタの頂面部の拡大縦断面図、第５図は
従来の一般型式のバルブリフタ及びシムを示す縦
断面図、第６図は回転自在のシムをバルブリフタ
に装着した従来の構造の縦断面図、第７図は同上
従来構造の他の型を示す縦断面図、第８図は従来
構造におけるシムによる打音の発生の説明図であ
る。１……バルブステム、５……バルブリフタ、５
ａ……凸部、５ｃ……平坦部、５ｄ……油溝、５
ｅ……条溝、７……シム、７ａ……凹部、７ｂ…
…外周部、７ｃ……潤滑油供給穴、７ｄ……条溝
、８……カム面。 Fig. 1 is a longitudinal sectional view of an embodiment of the present invention, Fig. 2 is a top view of the shim in the same embodiment, and Fig. 3 is a shim of the same embodiment.
An enlarged view of part C in the figure, FIG. 4 is an enlarged vertical sectional view of the top surface of the valve lifter in the same embodiment as above, FIG. 5 is a vertical sectional view showing a conventional general type valve lifter and shim, and FIG. 6 is a rotatable FIG. 7 is a vertical cross-sectional view showing another type of the conventional structure as above, and FIG. 8 is an explanatory diagram of the generation of tapping noise by the shim in the conventional structure. . 1... Valve stem, 5... Valve lifter, 5
a...Convex part, 5c...Flat part, 5d...Oil groove, 5
e... groove, 7... shim, 7a... recess, 7b...
...outer circumference, 7c...lubricating oil supply hole, 7d...groove, 8...cam surface.

Claims

[Claims for Utility Model Registration] 1. A valve lifter that is slidably supported by a cylinder head is fitted onto the upper end of the valve stem, and a shim for clearance adjustment is provided on the top surface of the valve lifter, and the shim is connected to a cam. In a valve operating mechanism for an internal combustion engine, which is placed in contact with a cam surface on a shaft and arranged so that a center line of the cam and a center line of the shim are offset, a convex portion is formed in the center of the top surface of the valve lifter, A recess that fits into the protrusion is provided in the center of the inner surface of the shim, and the depth of the recess is greater than the height of the protrusion and the width of the recess is smaller than the width of the cam surface; The shim is provided with a lubricating oil supply hole that communicates with the recess, and the valve lifter is provided with an oil groove that communicates with the recess and the sliding surface between the shim and the valve lifter. Valve mechanism. 2. The sliding contact surface between the shim and the valve lifter is constituted by the outer circumferential surface of the convex portion, the inner circumferential surface of the recess, the inner circumferential portion of the shim, and the outer circumferential portion of the top surface of the valve lifter. Valve mechanism of internal combustion engine. 3. The valve operating mechanism for an internal combustion engine according to claim 2, wherein annular grooves for lubricating oil are formed on the inner circumferential surface of the concave portion of the shim and on the outer circumferential surface of the top surface of the valve lifter, respectively.