The tensioner is a commonly used holding device on the belt and chain transmission system, which is characterized by keeping the belt and chain in the transmission process to have an appropriate tension, so as to avoid the belt slipping, or to avoid the synchronization belt skipping, detoothing and dragging out.

Or to prevent chain loosening, falling off, reduce sprocket, chain wear. The structure of the tensioner is varied, which roughly includes the fixed structure and elastic automatic adjustment structure, of which the fixed structure mostly uses the fixed adjustable sprocket to adjust the belt and the sprocket tension, the elastic automatic adjustment structure mostly uses the elastic parts to automatically rebound control the belt and chain tension, the domestic automatic adjustment chain tensioner mostly uses the spring structure. The foreign tensioner mostly uses rubber parts.

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