Variable-rigidity and high-damping type automatic tensioning device

Abstract

The invention discloses a variable-rigidity and high-damping type automatic tensioning device. The device comprises a tensioning arm, a housing, a first damping device, a second damping device, a torsion spring, a tensioning wheel, a mandrel, a rolling bearing and an abrasion-proof plastic bush, wherein the housing is fixed to an engine body; the mandrel is fixed to the housing; the tensioning armis mounted on the mandrel through the abrasion-proof plastic bush in a pivoting manner; a belt wheel is mounted at one end, far away from the mandrel, of the tensioning arm through the rolling bearing; a housing storing chamber is formed in the housing; one end of the torsion spring is arranged in the housing storing chamber, and the other end of the torsion spring is propped to a tensioning armspring seat of the tensioning arm; the first damping device and the second damping device are relatively arranged at the upper part of the housing storing chamber; one end of the first damping deviceis propped to the tensioning arm while the other end of the first damping device is propped to a torsion arm of the torsion spring. With the adoption of the device, high frictional damping capacity isprovided; high torque can be provided by changing the rigidity when the belt tension fluctuates greatly, and thus slipping and noise can be avoided.

Description

Technical field [0001] The invention relates to the field of transmission systems, in particular to an automatic tensioner with variable stiffness and large damping. The automatic tensioner is designed for a front-end accessory drive system of an automobile engine. Background technique [0002] For the automatic tensioner of the front-end accessory system of the automobile engine, the main purpose is to make the belt tension in the transmission system appropriate, compensate the belt tension or wear caused by the change and attenuate the swing of the tension arm caused by the fluctuation of the engine speed, so as to avoid Belt slip, noise and vibration make the system work normally and effectively. [0003] Patent CN201080012969 discloses a traction drive mechanism with a vibration damper. The vibration damper provided in the mechanism can be generated by the action of the spring and the vibration damper when the tension arm rotates and act on the vibration damper and the shell. ...

AI Technical Summary

Problems solved by technology

[0006] The purpose of the present invention is to provide an automatic tensioner with large damping and fast damping in order to overcome the problems caused by the small damping and fast decay of the current automatic tensioner, as well as the poor response of the system after the damping decays. After attenuation, it can still maintain a small tension arm swing angle, so that the system can maintain system stability throughout the life of the tensioner, ensuring that the front-end accessory system has good NVH performance and a long life of the tensioner

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