Camshaft bearing structure for engine

Abstract

The invention discloses a camshaft bearing structure for an engine, which consists of a first camshaft bearing and a plurality of same second camshaft bearings. The camshaft bearing structure for the engine is characterized in that: lower-half bearings of the second camshaft bearings are integrated on a cylinder cover; the first camshaft bearing is independent and not integrated on the cylinder cover. The first camshaft bearing is divided into an upper bearing cover and a lower bearing cover, is positioned by a positioning sleeve and is fixed on the cylinder cover through a fastening bolt. Oil ways are distributed in the upper cover and the lower cover of the first camshaft bearing and are used for introducing the pressure oil from the cylinder and providing oil for a hydraulic tappet, camshaft lubrication and a VVT phaser. By the independence of the first camshaft bearing, the front-end size of the cylinder cover can be obviously reduced, and the compactness of the engine can be improved. Meanwhile, the oil ways are arranged in the camshaft bearing covers, so that the camshaft bearing structure for the engine has the function of building a lubricating oil way, thereby simplifying the arrangement of the lubricating oil way of the cylinder cover.

Description

technical field [0001] The invention relates to a new type of engine camshaft bearing combination and arrangement structure. Background technique [0002] The gasoline engine of existing overhead camshaft structure mostly makes all camshaft lower bearings on the cylinder head, and the camshaft upper bearing cap is made into a separate or integral (frame type) form. This structure lengthens the cylinder head as a whole because the first gear camshaft cover needs to be arranged at the front end, especially for VVT engines that are widely used at present. There are multiple oil passages arranged on the first bearing, which makes the lengthening of the cylinder head more obvious. It is beneficial to reduce the weight of the engine and improve the compactness of the engine. Contents of the invention [0003] The purpose of the present invention is to provide a new type of camshaft bearing structure, by separating the first gear bearing of the camshaft from the cylinder head, a...

AI Technical Summary

Problems solved by technology

This structure lengthens the cylinder head as a whole because the first gear camshaft cover needs to be arranged at the front end, especially for VVT engines that are widely used at present. There are multiple oil passages arranged on the first bearing, which makes the lengthening of the cylinder head more obvious. Conducive to reducing engine weight and improving engine compactness

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