Hydraulic tensioner

Details Hydraulic tensioner Hydraulic tensioner

1996-12-12

1998-11-10

Poon, Peter M.

Spring devices

Vehicle

Mechanical spring and nonresilient retarder

1882662, 474110, F16H 708

Patent

active

058332200

ABSTRACT:
A hydraulic tensioner which has a small number of components and hence can be reduced in size. The hydraulic tensioner includes a plunger 3 slidably fitted in a cylinder disposed in a tensioner body, a reservoir chamber formed in the tensioner body in a lower portion of the cylinder, a check valve permitting flow of an oil in a single direction from the reservoir chamber into the cylinder which is formed as a high pressure chamber, a low pressure chamber formed in the tensioner body exteriorly of the cylinder, an oil passage connecting a bottom of the low pressure chamber to a position between the check valve and the reservoir chamber, and a spring urging the plunger upwardly, wherein the low pressure chamber contains an air layer formed above a surface of the oil held in the lower pressure chamber. The oil passages and check valve enable the oil to flow into the high pressure chamber in a short time and hence efficiently dampen vibrations of the plunger.

REFERENCES:
patent: 4790801 (1988-12-01), Schmidt et al.
patent: 4950209 (1990-08-01), Kawashima et al.
patent: 5383813 (1995-01-01), Odai
patent: 5632474 (1997-05-01), Hayakawa et al.

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