Main journal surface structure for camshaft of internal combustion engine

Abstract

The invention relates to a main journal surface structure for a camshaft of an internal combustion engine and belongs to the technical field of camshafts. The main journal surface structure for the camshaft of the internal combustion engine is mainly characterized in that the surface of a main journal is of a crown-shaped R arc structure; the shape of a conventional camshaft main journal surface is changed, and the surface of the main journal is formed to be of the crown-shaped R arc structure by processing; by virtue of the crown-shaped R arc structure of the surface of the main journal, when the main journal is in fit with a bearing pad in the using process of the camshaft, a high point of a crown in the middle of the main journal touches the bearing pad firstly, and then the main journal touches the whole bearing pad after small deformation, so that loads borne at two edges of the main journal are reduced, the abrasion of the two edges of the main journal is reduced, and the service life of the camshaft is prolonged.

Description

technical field [0001] The invention relates to a main journal surface structure of a camshaft of an internal combustion engine, belonging to the technical field of camshafts. Background technique [0002] The camshaft is an important part of the engine, and the main journal of the camshaft is a part that keeps the overall smooth operation of the camshaft. The quality of the main journal directly affects the performance of the engine. At present, the design of the camshaft has made relevant requirements on the roundness, cylindricity and roughness of the main journal. In the process of use, we found that there is a common phenomenon in the failure mode of the main journal of the camshaft. The wear on the two edges of the main journal is more severe than that in the middle, and serious wear marks are formed on the two edges of the main journal. At present, the surface structure of the main journal of the internal combustion engine camshaft is parallel to the axis of the ...

AI Technical Summary

Problems solved by technology

[0003] The purpose of the present invention is to provide a main journal surface structure of an internal combustion engine camshaft for an existing camshaft that is prone to produce boundary loads during the working process due to structural factors and cause abnormal wear on the two edges of the main journal. The load on the place is reduced, so that the wear of the two edges of the main journal is reduced, and the service life of the camshaft is extended

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