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:
Oct. 18, 2011
Filed:
May. 14, 2007
Satoru Suzuki, Kosal, JP;
Tsutomu Suzuki, Kosai, JP;
Yuzo Geshi, Kosai, JP;
Hiroyuki Nakano, Kosai, JP;
Kiyonori Hirao, Kosai, JP;
Satoru Suzuki, Kosal, JP;
Tsutomu Suzuki, Kosai, JP;
Yuzo Geshi, Kosai, JP;
Hiroyuki Nakano, Kosai, JP;
Kiyonori Hirao, Kosai, JP;
Univance Corporation, Shizuoka, JP;
Abstract
A four-wheel-drive-vehicle driving force distribution apparatus has an auxiliary transmission mechanism for switching motive power transmitted to an input shaft at least between two levels, a high speed and a low speed, and transmitting the motive power to a main output shaft; a friction clutch for selectively transmitting the motive power of the main output shaft to an auxiliary output shaft; a ball cam mechanism for changing the pressing force of the friction clutch in a non-step manner; and a shift mechanism for shifting the auxiliary transmission mechanism. A clutch control mechanism is provided between a drive member fixed to an output shaft of a motor and a pinion gear and changes the clutch pressing force caused by the ball cam mechanism corresponding to clockwise rotation of the drive member performed by a motor starting from a control starting point. A shift control mechanism is provided between the drive member and a shifting cylindrical cam and alternately repeating switching between a H position and a L position of the auxiliary transmission mechanism in every counterclockwise reciprocating rotation of the drive member performed by the motor starting from the control starting point.