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:
Feb. 14, 1995
Filed:
Apr. 22, 1993
Masahiro Inoue, Yamatokohriyama, JP;
Shuzo Hirakushi, Uda, JP;
Koyo Seiko Co., Ltd., Osaka, JP;
Abstract
A torque transmission device of a four-wheel drive vehicle having a pair of drive shafts includes a hydraulic pump for transmitting torque to both drive shafts through a variable oil pressure generated therein according to the difference in rotational speed between both drive shafts, and a multiple disc clutch for transmitting torque to both drive shafts by a frictional coupling power. The hydraulic pump has a casing and a rotor housed therein. The casing is rotated by one of the drive shafts. The rotor is rotated by the other drive shaft through a transmitting member, a hydraulic piston mechanism and a rotary sleeve. The transmitting member has a clutch operating portion for operating the clutch. When the transmitted torque exceeds a predetermined level, the hydraulic piston mechanism is adapted to move the transmitting member to operate the multiple disc clutch with no intermediary of the casing.