A valve rocker arm assembly for a motorcycle engine

Abstract

The invention discloses a valve rocker assembly of a motorcycle engine. The valve rocker assembly comprises rockers assembled on an air cylinder head rocker shaft, and torsional springs exerting pre-tightening force on the rockers. The rockers are provided with cam ends and valve ends, and the cam ends and the valve ends are located on the two sides of the air cylinder head rocker shaft respectively. Each torsional spring comprises a spiral section and two free ends, wherein one free end is a rocker end for exerting pre-tightening force on the corresponding rocker, and the other free end is a limiting end. The rockers are provided with limiting and fixing parts. The rocker ends of the torsional springs are limited and fixed through the limiting and fixing parts. The rocker ends provide downward pre-tightening force for the valve ends of the rockers. The valve rocker assembly is simple and compact in structure, the installing precision of the torsional springs is high, the installing and working torsion angle of the torsional springs can be well controlled, and the noise erase effect of the torsional springs is improved.

Description

technical field [0001] The invention relates to a motorcycle, in particular to a valve rocker arm assembly of a motorcycle engine. Background technique [0002] Such as Figure 1~Figure 2 As shown, when the motorcycle engine is working, the working temperature of the cylinder head is extremely high. In order to ensure that the engine can work normally under various working conditions, it is necessary to compensate the thermal expansion of the tappet 1A, that is, reserve 0.06~ The valve clearance of 0.12mm, but because of the existence of the valve clearance, when the engine is working, the tappet 1A is driven by the cam 5A to reciprocate up and down because of its fast movement speed, and the top of the tappet 1A will jump, making the tappet The top of 1A and the adjustment nut 3A on the upper part of the rocker arm 2A valve will produce impact noise at the moment of contact. For this reason, in the prior art, a torsion spring 4A is installed on the rocker arm flange 21A of ...

AI Technical Summary

Problems solved by technology

[0003] However, since a free end (rocker arm end) of the torsion spring is hooked on the back of the long arm side, the multi-directional freedom of the torsion spring rocker arm end is not restricted, and the rocker arm end will produce a relatively large force when the torsion spring is stressed. The large displacement, coupled with the existence of manufacturing errors of the torsion spring itself and the deformation of the torsion spring when it is stressed, will cause a large deviation of the torsion angle of the torsion spring during installation, which will affect the effect of torsion spring installation and will eventually affect the quality of the torsion spring. The effect of eliminating noise from the engine during operation

[0004] Moreover, due to the influence of the arm length tolerance of the rocker arm on the side of the valve end and the ribs on the back of the rocker arm (forged shape, large dimensional error, not accurate enough), the above-mentioned abnormal noise cancellation effect will be exacerbated

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