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:
Aug. 20, 2002
Filed:
Jun. 21, 2000
Naosumi Tada, Nabari, JP;
BorgWarner Inc., Troy, MI (US);
Abstract
A hydraulic chain tensioner comprises a hollow plunger slidably received within the bore of a housing. A spring pushes the plunger in the protruding direction, and a pressure relief valve assembly and an air vent disc that are integrally incorporated on the upper end at the tip of the plunger. The air vent disc has a disc shape including a first and second face. An outer periphery is formed with a through-hole. The outer diameter of the air vent disc is slightly smaller than the inner diameter of the plunger. The first face is formed with a spiral groove and the circumferential edge portion of the first face is formed with a radius. The starting end of groove is disposed at the radius and the terminal end of the groove is centrally located on the first face.