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. 17, 2009
Filed:
Aug. 30, 2005
Hiroshi Hashimoto, Osaka, JP;
Yoshio Kurokawa, Osaka, JP;
Tsutomu Namie, Osaka, JP;
Kazuyuki Iwata, Saitama-ken, JP;
Hiroshi Hashimoto, Osaka, JP;
Yoshio Kurokawa, Osaka, JP;
Tsutomu Namie, Osaka, JP;
Kazuyuki Iwata, Saitama-ken, JP;
Tsubakimoto Chain Co., Osaka, JP;
Honda Motor Co., Ltd., Tokyo, JP;
Abstract
In a hydraulic tensioner having a relief valve inside its plunger, a relief valve spring-receiving plug, press-fit into the plunger is formed by forging a plurality of flat surfaces on its exterior. These flat surfaces, in cooperation with the cylindrical inner wall of the plunger, form plural oil passages, each having a segment-shaped cross-section. The oil passages allow flow of oil past the plug to a discharge opening at the front end of the plunger, and the flow of oil is substantially unaffected by circumferential displacement of the oil passages on the periphery of the plug relative to the oil passages on the periphery of the relief valve seat.