Chain tensioner with oil reservoir

Details Chain tensioner with oil reservoir Chain tensioner with oil reservoir

1993-11-23

1994-10-04

Buiz, Michael P.

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

F16H 700

Patent

active

053521595

ABSTRACT:
In an oil-operated tensioner for the timing chain of an internal combustion engine, a plunger slidable in a bag-shaped cylinder open at one end, divides the cylinder into a high pressure chamber on the side of the plunger opposite to the open end, and a low pressure chamber on the other side of the plunger. A seal at the open end surrounds a piston rod connected to the plunger. A check valve allows free flow from the low pressure chamber to the high pressure chamber so that the plunger can move rapidly in the projecting direction. A restricted passage allows only slow flow of oil in the opposite direction to prevent rapid retracting movement of the plunger. An oil reservoir, formed as an integral part of a housing of the tensioner or by an outer housing surrounding the cylinder, has a passage in communication with the low pressure chamber and an opening for collecting oil from the oil mist within the engine and surrounding the tensioner. Working oil for the tensioner is replenished from the oil mist, and leakage of oil from the high pressure chamber is prevented even when the engine is shut down.

REFERENCES:
patent: 4911679 (1990-03-01), Inoue et al.
patent: 5248282 (1993-09-01), Suzuki
patent: 5314388 (1994-05-01), Suzuki et al.

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