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:
Jul. 03, 1990
Filed:
Apr. 17, 1987
Masaharu Sumiyoshi, Aichi, JP;
Masaaki Noguchi, Aichi, JP;
Kabushiki Kaisha Toyota Chuo Kenkyusho, Aichi, JP;
Abstract
A full time-four-wheel-drive vehicle in which front and rear wheels are always connected to each other through a torque transmission coupling includes an engine; a transmission, a first differential which is driven through the transmission to drive one of a front and a rear wheel systems; a second differential which is drivingly connected to the other of the systems; and a torque transmission coupling which includes an input shaft which is drivingly connected to the transmission and the first differential, an output shaft which is drivingly connected to the second differential, an oil pump which is driven by the relative rotation between the input shaft and the output shaft to generate oil pressure corresponding to the speed of the relative rotation, and a friction clutch mechanism which engages the input shaft and the output shafts with each other by the oil pressure generated by the oil pump.