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. 05, 1997
Filed:
Jul. 25, 1995
Kazuki Kawashima, Iwata, JP;
Tomoyoshi Egusa, Iwata, JP;
NTN Corporation, Osaka, JP;
Abstract
A hydraulic autotensioner is arranged so as to include a cylindrical body having a closed end, a plunger slidably mounted in the body and formed with a hole in a top surface thereof, and a rod having a bottom end which is inserted in the hole. The plunger partitions the interior of the cylindrical body into a pressure chamber and a reservoir chamber. The pressure chamber communicates with the reservoir chamber through a return passage. A pressure control spring biases the rod and the plunger in a direction out of the cylindrical body. The return passage is defined by an axial through hole extending through the bottom surface of the plunger. A groove is formed in the inner peripheral surface of the plunger or in a surface of a bottom portion of the rod.