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. 18, 1997
Filed:
Dec. 06, 1994
Katsumi Maehara, Yokosuka, JP;
Hiroshi Ohkuma, Yokohama, JP;
NABCO Limited, Kobe, JP;
Abstract
It is an object of this invention to make compact a system for controlling the distribution of a driving force and also to simplify its controlling procedure. To achieve this object, a motor 200, 2200 is designed to be electrically controlled, and the rotation of the motor is transformed to the stroke of a plunger 370, 2370 by a hydraulic pressure producing cylinder device 300. By doing this, a hydraulic pressure is produced within a hydraulic pressure chamber 376, 2376 and the hydraulic pressure thus produced is supplied to an operating cylinder 40. The operating cylinder 40 controls a gain of an engagement force of a variable torque clutch device 30. Also, it is another object of the present invention to provide a fail-safe technique for a hydraulic pressure supply device of the motor drive type. In order to achieve this second object, there is further employed a hydraulic pressure compensating device 500, 2500 for supplying, when a failure has occurred disenabling rotation of the motor 200, 2200, a predetermined hydraulic pressure to the operating cylinder 40 in response to the occurrence of the failure and maintain the hydraulic pressure to that level.