Hydraulic tensioner with internal pressure relief

Details Hydraulic tensioner with internal pressure relief Hydraulic tensioner with internal pressure relief

1995-09-06

1998-02-24

Bagnell, David 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

474101, 474109, 474111, F16H 708, F16H 722

Patent

active

057206848

ABSTRACT:
A hydraulic tensioner having a hollow plunger slidably fitted in a cavity in a housing and biased in a protruding direction by a spring and fluid. A check valve permits fluid to only flow into the cavity, and thereby protrude the plunger, but not out of the cavity. A sleeve slidably fits within the plunger hollow forming a small clearance between the lower end of the plunger and sleeve. The plunger is made of an elastic material capable of expanding in diameter upon increases in internal pressure to permit increased fluid flow through the increased clearance and thus release cavity fluid pressure to allow the plunger to recede into the cavity.

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