Jtekt Corporation

Fuji Jukogyo Kabushiki Kaisha

Koyo Seiko Company, Ltd.

Fuji Heavy Industries Ltd.

Jtekt Co., Ltd.

Kouji Yoshinami

Takatoshi Sakata

Mamoru Murakami

Kazuo Kanazawa

Yasuhiro Yukitake

Yasuo Asai

In a method of operating an electric motor which drives an auxiliary oil pump for supplying a hydraulic pressure of an ATF to a transmission, only at an idle stop of an engine via a rotation shaft pivotally supported by ball bearings, the electric motor is rotated at a very low speed or in an intermittent manner when an automobile is traveling and the auxiliary oil pump is not used. According to the configuration, the electric motor is slightly rotated during when the automobile is traveling, whereby impressions are prevented from being formed on the ball bearings.

Method of operating a vehicle electric motor

Providing a drive transmission apparatus for vehicle capable of ensuring the adaptability of an electric motor to a high-temperature environment and increasing the degree of freedom for apparatus layout. The drive transmission apparatus for vehicle serves to distribute a drive force generated by a rotary drive sourcebetween drive wheelsand includes: an input memberapplied with the drive force from the rotary drive sourcean output memberfor outputting the drive force to the drive wheelsa hydraulic clutchfor hydraulically performing drive transmission/transmission cut-off between the input memberand the output memberan oil pumpfor applying a hydraulic pressure to the hydraulic clutchand a sensorless brushless motor for driving the oil pump.

Drive transmission apparatus for vehicle and a four-wheel drive vehicle

An electronic controlled coupling including a wet-type multiple disc clutch, a coupling case, a hydraulic chamber, an oil pump, an electric motor, an electric control unit, and a supply passage for supplying hydraulic pressure. The coupling case accommodates the wet-type multiple disc clutch and contains oil. The oil pump driven by the electric motor is connected to the coupling case. The outlet of the oil pump is connected to the hydraulic chamber of the wet-type multiple disc clutch with the supply passage therebetween. The electric control unit controls the speed of rotation of the electric motor through a motor driver so that the pump discharge pressure is equal to an operating pressure required for the wet-type multiple disc clutch. The electronic controlled coupling performs a complete coupling mechanism increasing the durability as a coupling and a compact and simple structure enhancing the flexibility in designing.

Electronic controlled coupling

Growing community of inventors

Kashiba, Japan

Kouji Yoshinami