Auto-tensioner

Details Auto-tensioner Auto-tensioner

2007-12-06

2010-02-02

Siconolfi, Robert A (Department: 3657)

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

C474S111000

Reexamination Certificate

active

07654924

ABSTRACT:
An auto-tensioner includes a housing having an open end and a closed bottom at another end. A cylindrical plunger is slidably inserted in the housing with its open end facing the closed bottom of the housing and its other end protruding from the housing. A ring-shaped seal member is mounted between the inner periphery of the housing and the outer periphery of the plunger for hermetically sealing oil in the housing. A screw rod and a nut member are mounted in the plunger so as to be coaxial with the plunger, with the nut member in threaded engagement with the screw rod. A return spring is mounted between the nut member and the plunger to bias the nut member and the plunger in a direction axially away from each other. A spring is mounted between the screw rod and the closed bottom of the housing to bias the screw rod in a direction away from the closed bottom of the housing.

REFERENCES:
patent: 6086497 (2000-07-01), Fukuda et al.
patent: 2002/0065159 (2002-05-01), Markley
patent: 2008/0280711 (2008-11-01), Sato et al.
patent: 64-41755 (1989-03-01), None
patent: 2005180537 (2005-07-01), None

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