Tochigi Fuji Sangyo Kabushiki Kaisha

Viscodrive Japan Ltd.

Makoto Hagiwara

Masao Teraoka

Osamu Ishikawa

Arranged within a differential gear case are first and second side gears rotating together with first and second output shafts, respectively; first and second differential gears engaged with one of the first and second side gears and rotatably supported within cylindrical holes, respectively, so as to be partially engaged with each other to move circularly together with the differential gear case; and a viscous coupling capable of transmitting, between a hub rotating together with the output shaft and a housing, a torque in response to the difference in the speed. The outer periphery of the housing is provided with a cam surface to be engaged, in the direction of rotation, with the first and second differential gears to press and bias the first and second differential gears against the inner cylindrical surfaces of the cylindrical holes.

Differential gear unit

A differential gear assembly has a friction clutch for restricting differential action. The clutch is actuated by an actuator which moves in a linear direction. The actuator is driven remotely in one embodiment by means of a rotating element, and in another embodiment by means of a spring biased pivotal element.

Locking differential gear assembly

A power transmission device is provided. The device comprises a casing for receiving a torque input, output members arranged inside the casing, movable members provided movably around the output members respectively, one side face of each of the movable members forming a cam face, clutches adapted for connecting the casing with the output members, and a cam shaft fixed to the casing and located between the movable members, wherein the torque input of the casing is transmitted to the output members through two routes, i.e., through the cam and the movable members, and through the clutches. The power transmission device is further provided with several improved parts such as improved friction faces, resistant members, cam faces, and pin.

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Tochigi, Japan

Makoto Hagiwara