Driven wheel, engine sprocket system and manufacturing method of driven wheel

Abstract

The invention provides a driven wheel, an engine sprocket system and a driven wheel manufacturing method. The pitch radius of the driven wheel is related to the real-time rotation angle of the drivenwheel. The engine sprocket system comprises a crankshaft sprocket, the driven wheel and a chain arranged around the crankshaft sprocket and the driven wheel. The driven wheel manufacturing method comprises the steps of acquiring the torsional vibration characteristics of an engine, and obtaining the rotation angles a of the crankshaft sprocket at different times according to the torsional vibration characteristics of the engine; and designing the tooth profiles of driven wheel teeth according to the rotation angles a of the crankshaft sprocket. The tooth profiles of the driven wheel teeth arerelated to the crankshaft torsional vibration, while the crankshaft torsional vibration depends on the ignition characteristics of the engine; thus, the stress of chain training can be improved effectively through the tooth profile change of the driven wheel, and the engagement positions of the driven wheel with the teeth are different since the tooth profiles of the teeth are different; and original superimposed order noise can be scattered, and the order noise is reduced effectively.

Description

technical field [0001] The invention relates to the technical field of automobiles, in particular to a driven wheel, an engine sprocket system and a manufacturing method of the driven wheel. Background technique [0002] In the automotive field, in order to improve the strength and NVH performance, the application range of toothed chain is more and more extensive. In the process of toothed chain transmission, the chain and the gear are driven at high speed and the load is alternating. The polygonal effect causes the lifting of the chain link, the lateral vibration of the chain, and the instantaneous acceleration when the engine is ignited, resulting in fluctuations in torque and speed. The unevenness and the impact caused by the meshing of the rigid chain link between the sprocket teeth will inevitably cause dynamic load and corresponding radiation noise. For example, a 21-tooth sprocket will generate 21-order noise. Order noise is the most important noise in chain drive sy...

AI Technical Summary

Problems solved by technology

The non-circular transmission wheel is also called special-shaped sprocket. Its indexing surface is not a rotating surface, and its instantaneous angular velocity ratio changes according to a certain established law of motion, which can improve the force of the chain and reduce the noise of the sprocket and chain at the same time. The order noise is reduced, but the order noise still exists, and the noise of each tooth is superimposed; as for the tooth modification, at present, the tooth profile is modified according to the established modification amount, and the modification amount of each tooth Consistent, that is, the same tooth shape, which can improve the meshing force of the chain, but has no obvious effect on improving the order noise

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