Tensioner for a toothed belt

Endless belt power transmission systems or components – Means for adjusting belt tension or for shifting belt,... – Tension adjuster or shifter driven by electrical or fluid motor

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Details

474138, F16H 708

Patent

active

051818892

ABSTRACT:
A hydraulic fluid tensioner for a toothed belt, having a piston with a piston-carried ball and seat check valve, utilizes a ball pressing spring having a spring force more than 30 times the weight of the ball and less than 60% of force resulting from the hydraulic pressure acting on the ball and urging the check valve open as the piston moves in the projecting direction. The spring force prevents rapid accelerating movement of the piston, or vibrations of the tensioner, from causing irregular piston movements resulting in noise and vibration.

REFERENCES:
patent: 4507103 (1985-03-01), Mittermeier
patent: 4539001 (1985-09-01), Okabe
patent: 4708696 (1987-11-01), Kimura et al.
patent: 4909777 (1990-03-01), Inoue et al.
patent: 4911679 (1990-03-01), Inoue et al.
patent: 5073149 (1991-12-01), Maruyama et al.

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