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:
Sep. 21, 1999
Filed:
Dec. 23, 1997
Fumitomo Yokoyama, Anjo, JP;
Kazuhisa Ozaki, Anjo, JP;
Masanori Kadotani, Anjo, JP;
Mikio Iwase, Anjo, JP;
Harumichi Tsuboi, Anjo, JP;
Makoto Hijikata, Anjo, JP;
Yasuo Hojo, Toyota, JP;
Atsushi Tabata, Toyota, JP;
Yasunori Nakawaki, Toyota, JP;
Yasunari Nakamura, Toyota, JP;
Nobuaki Takahashi, Toyota, JP;
Hideki Miyata, Toyota, JP;
Kagenori Fukumura, Toyota, JP;
Koji Tsukamoto, Shizuoka-ken, JP;
Aisin AW Co., Ltd., , JP;
Nok Corporation, , JP;
Abstract
An oil seal member is compressed between a connecting pipe for supplying oil to an oil chamber of a hydraulic servo and the cylinder drum of the hydraulic servo. The cylinder drum has an interior oil chamber and turns through a predetermined angle upon operation of a frictional engagement element by the hydraulic servo. The end of the seal member pressed against the cylindrical drum surrounds an oil hole 73 formed in the cylindrical drum, and oil pressure is supplied to the oil chamber through an oil passage in which the seal member is mounted and through the oil hole. A recess is formed in the outer surface of the cylindrical drum around the oil hole and the end of the seal member is received in the recess. When the cylindrical member turns within the predetermined angular range, the end of the seal member is protected by the recess. As a result, the end of the seal member is not damaged and the integrity of the seal is protected.