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:
Mar. 13, 2001
Filed:
Nov. 20, 1998
Mizuya Matsufuji, Amagasaki, JP;
Masahisa Kawamura, Amagasaki, JP;
Kanzaki Kokyukoki Mfg. Co., Ltd., Hyogo-Ken, JP;
Abstract
A four-wheel driven wheel has a rear-wheel driving system branching at the intermediate thereof into a front-wheel driving system comprising a first transmission for driving the front wheels at a peripheral speed substantially identical with that of the rear wheels and a second transmission for driving the front wheels at a peripheral speed higher than that of the rear wheels. A hydraulic clutch device is provided, including a hydraulically operable first friction clutch for connecting and separating the first transmission with the rear-wheel driving system, a hydraulically double-acting first piston for engagement and disengagement of the first friction clutch, a first fluid chamber for the clutch-engaging action provided at one side the first friction clutch, a second fluid chamber for the clutch-disengaging action provided at the other side thereof, and a biasing member for biasing the first friction clutch to engage disposed in the first chamber. A second clutch device is also provided including a hydraulically operable second friction clutch for connecting and separating the second transmission with the rear-wheel driving system, a hydraulically single-acting second piston for engagement of the second friction clutch, and a third piston provided at one side of the second piston for the clutch-engaging action thereof. A directional control valve is provided which is operable to be put into one of three positions: a first position wherein fluid is supplied to the first chamber; a second position wherein fluid is supplied to the second chamber; and a third position wherein fluid is supplied to the third chamber.