Belt tensioning device of vehicle engine

Abstract

The invention discloses a belt tensioning device of a vehicle engine. In order to eliminate or reduce the problems of belt creep and the like, the belt tensioning device comprises a base (1) and the like and is characterized by comprising a close cover (7), an elastic part and an asymmetric damping block (6), wherein one side of the close cover (7) facing to a cavity is provided with a convex pushing structure (12), the asymmetric damping block (6) is elastically connected with a pushing branch structure through the elastic part and is positioned between a circular wall (13-1) and the pushingbranch structure, the outward side of the asymmetric damping block (6) is in an arc shape which coincides with the shape of the circular wall (13-1); and when the inward side of the asymmetric dampingblock (6) moves opposite to the side of the pushing branch structure adjacent to the asymmetric damping block (6), the distance between the inward side and the side is closer and closer or farther and farther. The invention has different positive damping and negative damping, and can eliminate or reduce the problems of belt creep and shake, large rocker vibration amplitude, engine vibration and noise, and the like.

Description

technical field [0001] The invention relates to the technical field of automobiles, in particular to a belt tensioner for an automobile engine. Background technique [0002] The transmission belt on the automobile engine, in order to efficiently transmit energy to the rear stage when the automobile engine is working, it is necessary to maintain a good tension on the transmission belt, that is, the tension is always kept within a certain value range. Energy transfer, engine etc. are unfavorable. [0003] To achieve the above goals, belt tensioners are commonly used in modern cars. The tensioning wheel in the belt tensioning device presses on the transmission belt, and it adjusts in two directions: when the tension of the belt is too small, the tensioning wheel will automatically press downwards to keep the tension basically unchanged; When the tension of the belt is too high, the tensioning wheel will automatically lift up to keep the tension basically unchanged. [0004] ...

AI Technical Summary

Problems solved by technology

[0008] In the belt tensioning device of the prior art, if the damping is set larger, the problems that will occur are: a. When the belt rebounds and the tensioning wheel further presses the belt, the damping direction is opposite to the spring torque direction, which will consume Excessive spring torque makes the belt tension insufficient, resulting in slipping noise; b. It may cause the belt and the rocker arm to fail to recover in time, causing the belt to disengage from the tensioner, or the belt to slip, or the noise of the belt and the pulley beating, Affect the life; if the damping is set to be small, there will be problems: when the belt is pressed against the belt tensioner, the sum of the spring torque and damping is small, and the vibration of the wheel train belt and the vibration of the rocker arm will be large, etc. situation, the engine is prone to vibration and noise

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