Hydraulic autotensioner

Details Hydraulic autotensioner Hydraulic autotensioner

1995-07-25

1996-12-24

Schoeppel, Roger J.

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

474138, F16H 708

Patent

active

055869521

ABSTRACT:
A hydraulic autotensioner having a close-bottomed body in which is sealed hydraulic oil. A plunger is slidably mounted in the body with a gap formed therebetween through which the hydraulic oil can leak. The plunger is formed with a hole in the top thereof, and a return passage extending through the plunger from the bottom of the hole to the bottom of the plunger. A rod, having its bottom end inserted in the hole, is provided with a rod spring for biasing the rod in such a direction so as to protrude out of the body. A plunger spring is provided for urging the plunger against the bottom end of the rod. Also, a valve seat is provided on the bottom of the hole so as to be brought into close contact with the bottom end of the rod. The return passage is opened and closed by axial displacement of the rod relative to the valve seat.

REFERENCES:
patent: 4940447 (1990-07-01), Kawashima et al.
patent: 4985009 (1991-01-01), Schmidt et al.
patent: 4986796 (1991-01-01), Kawashima et al.
patent: 5104359 (1992-04-01), Shirai et al.

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