Hydraulic tensioner with improved relief valve

Details Hydraulic tensioner with improved relief valve Hydraulic tensioner with improved relief valve

2005-08-30

2009-11-17

Siconolfi, Robert A (Department: 3657)

Endless belt power transmission systems or components

Means for adjusting belt tension or for shifting belt,...

Load responsive tension adjuster or shifter

C474S110000, C474S111000

Reexamination Certificate

active

07618339

ABSTRACT:
In a hydraulic tensioner having a relief valve inside its plunger, a relief valve spring-receiving plug, press-fit into the plunger is formed by forging a plurality of flat surfaces on its exterior. These flat surfaces, in cooperation with the cylindrical inner wall of the plunger, form plural oil passages, each having a segment-shaped cross-section. The oil passages allow flow of oil past the plug to a discharge opening at the front end of the plunger, and the flow of oil is substantially unaffected by circumferential displacement of the oil passages on the periphery of the plug relative to the oil passages on the periphery of the relief valve seat.

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