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:
Apr. 13, 2004
Filed:
Jul. 02, 2002
Yasuhiko Ishikawa, Tochigi, JP;
Makoto Ishizuka, Tochigi, JP;
Yoshiyuki Nakabayashi, Tochigi, JP;
Kouji Iizuka, Tochigi, JP;
Yasushi Koshigaya, Tochigi, JP;
Yoshiaki Kitsunezuka, Tochigi, JP;
Kenji Karasawa, Tochigi, JP;
Masayuki Sayama, Tochigi, JP;
Tochigi Fuji Sangyo Kabushiki Kaisha, Tochigi, JP;
Abstract
A wet type friction clutch and an electromagnetic clutch is disclosed wherein a pilot clutch is disposed in a magnetic flux path of an electromagnet and is kept between an armature and the electromagnet . Upon excitation of the electromagnet , the armature is retracted to allow the pilot clutch to be coupled. The pilot clutch includes a plurality of clutch plates which are interleaved with respect to one another for sliding movements. Adjacent clutch plates A, B, A, B, C, D, E, F are formed with oil guide passageways to create a hydrodynamic pressure effect to allow the clutch plates to be separated with a limited drag torque. Further, the clutch plate has magnetic flux path forming portions , at inner and outer peripheral sides, between which through-bores are formed to allow bridge portions to be intervened between the through-bores, with each of the bridge portions being configured such that opposing walls of the bridge portions of adjacent clutch plates have reduced contact surface areas to eliminate a leakage of a magnetic flux.