Timing positioning mechanism of overhead camshaft gear

Abstract

The invention discloses a timing positioning mechanism of an overhead camshaft gear. The timing positioning mechanism comprises a positioning blind hole, a gear positioning through hole, a signal panel positioning through hole and a pin. The positioning blind hole is formed in one face of a camshaft cover. The gear positioning through hole is formed in a gear disc of the camshaft gear. The signalpanel positioning through hole is formed in the panel face of a camshaft signal panel. The pin penetrates through the signal panel positioning through hole and the gear positioning through hole and isfinally inserted into the positioning blind hole, and then the relative positions of the camshaft cover, the camshaft gear and the camshaft signal panel are fixed. According to the timing positioningmechanism of the overhead camshaft gear, a camshaft and the camshaft gear can be fixed to correct relative positions, and assembly errors caused by relative rotation of the camshaft and the camshaftgear are avoided.

Description

technical field [0001] The invention relates to the field of internal combustion engines, in particular to a timing positioning mechanism for overhead camshaft gears. Background technique [0002] There are two types of engine camshafts: mid-mounted and overhead-mounted, and each structure has certain advantages and different disadvantages. High-speed engines generally use overhead camshafts to reduce valve flying due to the inertial force generated by the arrangement of tappets and other parts during high-speed operation. [0003] At present, the assembly of the overhead camshaft gear mainly ensures the correct phase through point-to-point assembly. If the timing point is wrong during the assembly process, it will lead to valve topping failure. [0004] The timing mark on the timing gear on the overhead camshaft in the prior art must be matched with the timing mark on the camshaft idler gear during the assembly process. If Inaccurate alignment will lead to wrong timing of...

AI Technical Summary

Problems solved by technology

The camshaft cover and other parts can only be assembled after the camshaft is aligned according to the timing, which is inefficient

[0007] In the process of engine maintenance, if the cylinder head needs to be disassembled, the camshaft 4 is generally not disassembled. When the cylinder head is reinstalled, it is difficult to align the timing on the camshaft gear 2 with the idler gear of the camshaft, and the cylinder head is then assembled to the During the process of the cylinder block, the teeth may be misaligned due to the relative rotation of the camshaft 4, and it is difficult to find out during the process

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