The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Nov. 10, 1998
Filed:
Dec. 12, 1996
Katsuya Nakakubo, Saitama-ken, JP;
Hiroyuki Miyake, Saitama-ken, JP;
Toru Fujiwara, Saitama-ken, JP;
Tsubakimoto Chain Co., Osaka-fu, JP;
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.