Nissan Motor Company Limited

Fujiunivance Corporation

Sadao Namioka

Masatoshi Maekawa

Yoshiaki Tajima

A transfer device for a four wheel drive motor vehicle is shown, which comprises an input shaft; a rear wheel output shaft arranged coaxial with the input shaft; a front wheel output shaft arranged in parallel with the input shaft; an auxiliary transmission disposed about the input shaft, the auxiliary transmission having low and high speed gear stages; a center differential disposed about the rear wheel output shaft at a position adjacent the auxiliary transmission; a switch device arranged between the auxiliary transmission and the center differential, the switch device being cable of connecting the auxiliary transmission and the center differential while keeping one of the low and high speed gear stages of the auxiliary transmission, wherein the switch device is so constructed as to surround the center differential.

Transfer device for four wheel drive motor vehicle

The rotational speed of a motor is reduced by a worm gear and a worm wheel and the reduced rotation is transferred to a first pinion gear. A first moving plate is moved along a pair of shafts. A second moving plate is provided for the first moving plate by inserting to the same pair of shafts. A first coil spring is interposed between a retaining portion of a shaft inserting hole of the first moving plate of one of the shafts and a retaining portion of a shaft inserting hole of the second moving plate. The first coil spring is compressed by the movement of the first moving plate upon switching to the 4-wheel drive, thereby accumulating the force. A second coil spring is interposed between a retaining portion of the shaft inserting hole of the first moving plate of the other shaft and a retaining portion of the shaft inserting hole of the second moving plate. The second coil spring is compressed by the movement of the first moving plate upon switching to the 2-wheel drive, thereby accumulating the force. When the switching enable state of a coupling sleeve from the 4-wheel drive to the 2-wheel drive is satisfied, a second pinion gear is rotated by a rack gear of the plate by the movement of the second moving plate due to the force accumulated in the spring. A shift rod is shifted through a planetary gear mechanism by the engagement with the rack gear of the third pinion gear.

2-wheel/4-wheel drive switching apparatus

A transfer device for a four wheel drive motor vehicle is disclosed, which comprises an input shaft; a rear wheel output shaft arranged coaxial with the input shaft; a front wheel output shaft arranged in parallel with the input shaft; a center differential for distributing torque, applied thereto from the input shaft, to both the rear and front wheel output shafts through rear and front torque transmitting ways respectively; a differential control device operatively interposed between the rear and front torque transmitting ways to control a slip which may occur between the rear and front wheel output shafts; and a torque transmitting mechanism for transmitting the distributed torque from the center differential to the front wheel output shaft, wherein the center differential, the torque transmitting mechanism and the differential control device are supported by and aligned along the rear wheel output shaft in this order, and the rear wheel output shaft is supported by a bearing at a position between the torque transmitting mechanism and the differential control device.

Growing community of inventors

Kanagawa, Japan

Sadao Namioka