Free piston type auto-tensioner

Details Free piston type auto-tensioner Free piston type auto-tensioner

1987-11-06

1988-12-13

Bui, Thuy M.

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 712

Patent

active

047907967

ABSTRACT:
A free piston type auto-tensioner adjusts a tension of an engine timing belt for automobiles. The auto-tensioner includes a body, a plunger slidably disposed in the body to form a first oil chamber, a free piston slidably disposed in the body to form a second oil chamber, a first seal member disposed between the body and the piston, a second seal member disposed between the piston and a rod of the plunger, an oil passage formed in the plunger to establish an oil communication between the first and second oil chambers, a check valve disposed in the oil passage, a first spring biasing the plunger, and a second spring biasing the piston.

REFERENCES:
patent: 4539001 (1985-09-01), Okabe
patent: 4657524 (1987-04-01), Okabe

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