JPS6427409U

JPS6427409U -

Info

Publication number: JPS6427409U
Application number: JP12253087U
Authority: JP
Priority date: 1987-08-12
Filing date: 1987-08-12
Publication date: 1989-02-16
Also published as: JPH0452406Y2

Description

[Brief explanation of the drawing]

第１図は本考案の実施例の主要部の平面図、第
２図はその切断正面図、第３図は本考案の他の実
施例の主要部の平面図、第４図はその切断正面図
、第５図は本考案の実施例の全体を示す切断正面
図である。１……バルブステム、５……バルブリフタ、５
ａ……凸部、６……シリンダヘツド、７……シム
、７ａ……凹部、８……カム、５０……バルブリ
フタ頂面、５１……渦巻き溝。 Fig. 1 is a plan view of the main part of an embodiment of the present invention, Fig. 2 is a cutaway front view thereof, Fig. 3 is a plan view of the main part of another embodiment of the present invention, and Fig. 4 is a cutaway front view thereof. FIG. 5 is a cutaway front view showing the entire embodiment of the present invention. 1... Valve stem, 5... Valve lifter, 5
a... Convex portion, 6... Cylinder head, 7... Shim, 7a... Concave portion, 8... Cam, 50... Valve lifter top surface, 51... Spiral groove.

Claims

[Claims for Utility Model Registration] 1. A valve lifter fitted onto the upper end of a valve stem and slidably supported by a cylinder head;
A shim for adjusting the clearance disposed on the top surface of the valve lifter, and a cam that abuts on the outer surface of the shim to raise and lower the valve lifter, a convex portion is formed in the center of the top surface of the valve lifter, A concave portion that fits into the convex portion is provided in the center of the inner surface of the shim, and the cam is arranged such that its center line deviates from the center line of the shim, and as the cam is rotationally driven, the shim moves toward the valve lifter. In a valve train for an internal combustion engine that rotates around an axis, the sliding surface between the top surface of the valve lifter and the inner surface of the shim has a certain angle with respect to the tangential direction of the sliding surface. An inclined spiral groove is formed in a direction in which lubricating oil flows from the periphery of the sliding surface toward the center by rotation of the shim, and the spiral groove A valve mechanism for an internal combustion engine, characterized in that the width of the sliding surface is gradually narrowed from the periphery toward the center. 2. The internal combustion engine according to claim 1, wherein the spiral groove is formed on the top surface of the valve lifter, and the spiral direction of the spiral groove is oriented in the same direction as the rotational direction of the shim. Engine valve mechanism. 3 forming the spiral groove on the inner surface of the shim;
2. The valve operating mechanism for an internal combustion engine according to claim 1, wherein the spiral direction of the spiral groove is directed in a direction opposite to the rotational direction of the shim.