A self-adjusting tensioner

Abstract

The invention provides a self-adjusting tensioner which comprises a shell, a floating element and a plunger. The floating element is mounted in a sliding cavity of the shell in a sliding fit manner and divides the sliding cavity into a primary hydraulic cavity and a secondary hydraulic cavity, a first one-way valve is arranged on a middle passage of the floating element, a second one-way valve is arranged on a fluid incoming passage of the secondary hydraulic cavity, the plunger is mounted in the primary hydraulic cavity in a sliding fit manner, a first elastic element is arranged in the primary hydraulic cavity, one end of the first elastic element is abutted against the plunger and the other end of the same is abutted against the floating element, a second elastic element is arranged in the secondary hydraulic cavity, and one end of the second elastic element is abutted against the floating element while the other end of the same is abutted against the shell. By adopting the self-adjusting tensioner, nonlinear and self elasticity adjusting functions are realized, a timing system is ensured to run stably and reliably in the whole life cycle of an engine, system friction force is reduced, and muting, energy-saving and emission-reducing effects are realized.

Description

technical field [0001] The invention relates to a tensioning device driven by chains and belts, in particular to a self-adjusting tensioner. Background technique [0002] At present, the structure of the timing tensioner is generally a single-stage spring type. The spring force attenuation of this structure is relatively serious. After the chain is worn and elongated, the chain tension drops relatively greatly, resulting in large timing errors and the risk of tooth skipping. . Yet existing solution is: improve spring initial elastic force, perhaps increase anti-jump rib at sprocket wheel peripheral attachment. [0003] The scheme of increasing the initial spring force of the spring can effectively deal with the risk of tooth jumping after wear to a certain extent, but the initial tension is relatively large, which leads to high friction in the system, and significantly increases noise and energy consumption. [0004] The scheme of adding anti-skipping ribs at the circumfer...

AI Technical Summary

Problems solved by technology

[0003] The scheme of increasing the initial spring force of the spring can effectively deal with the risk of tooth jumping after wear to a certain extent, but the initial tension is relatively large, resulting in high friction in the system, significantly increasing noise and energy consumption

[0004] The scheme of adding anti-skipping ribs at the circumference of the sprocket can only passively block the chain skipping teeth. Although it can effectively prevent the phenomenon of tooth skipping, it will cause the chain to collide with the anti-skipping ribs, which will cause abnormal noise, and Impurities will be formed, which are more harmful to the engine

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