Hydraulic tensioner with ratchet mechanism

Details Hydraulic tensioner with ratchet mechanism Hydraulic tensioner with ratchet mechanism

2005-04-12

2005-04-12

Charles, Marcus (Department: 3682)

Endless belt power transmission systems or components

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

Load responsive tension adjuster or shifter

C474S110000

Reexamination Certificate

active

06878082

ABSTRACT:
A hydraulic tensioner that applies tension to a chain is comprised of a hollow plunger slidably received in a bore of the housing having an inner space defining a fluid chamber with the bore and a rack member provided slidably in an axial direction in a groove on the outer circumference of the plunger. The hydraulic tensioner further comprises a spring biasing the plunger in a protruding direction, a ratchet member provided slidably in a ratchet hole extending in an inclined direction intersecting an axis of the plunger having cylindrical head portion with an outer circumferential edge portion adapted to engage rack teeth of the rack member, permitting travel of the plunger in a protruding direction but preventing retraction of the plunger in a backward direction, and a coil spring that biases the ratchet member in an engaging direction of the rack teeth.

REFERENCES:
patent: 5304099 (1994-04-01), Deppe et al.
patent: 6045471 (2000-04-01), Suzuki
patent: 6634973 (2003-10-01), Simpson et al.
patent: 4431161 (1995-03-01), None
patent: 1138979 (2001-10-01), None
patent: (1323948) (2003-07-01), None
patent: (09-89057) (1997-03-01), None
patent: 2000-136859 (2000-05-01), None
patent: 2001-304360 (2001-10-01), None

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