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:
Mar. 20, 2001
Filed:
May. 27, 1999
Sumio Watanabe, Kawagoe, JP;
Shigekazu Fukuda, Tokorozawa, JP;
Tsubakimoto Chain Co., Osaka, JP;
Abstract
A hydraulic tensioner includes a ball check valve disposed inside a tensioner body for permitting the flow of oil only in one direction from an oil passage connected to an oil source toward and a high-pressure chamber formed behind a plunger within a plunger receiving hole in the tensioner body. The ball check valve includes a valve seat on which a check ball rests when closed. The valve seat has a tapered seating surface outwardly diverging at an angle of 60°-110°, and the check ball has a mass of 0.1 g or less. The check ball enables following up oil pressure variations of high frequencies, and even in a region wherein the load acting on the plunger varies at high frequencies it is possible to ensure a sufficient backstop force without increasing the oil pressure supplied.