Patent ID: 6142905
Filing Date: 2000-11-07
Classification: B60K,Y10T

Abstract:
A transmission for use in a four-wheel drive motor vehicle having an engine and front and rear drivelines, said transmission comprising:an input shaft adapted to be driven by the engine;a mainshaft;a front output shaft adapted to drive the front driveline;a rear output shaft adapted to drive the rear driveline;constant mesh gearsets which can be selectively engaged to couple said mainshaft to said input shaft for driven rotation at predetermined speed ratios, said constant mesh gearsets including a first input gear rotatable supported on said input shaft, a first compound gear rotatable supported on said mainshaft and having a first drive gear meshed with said first input gear and a second drive gear, a second compound gear rotatably supported on said input shaft and having a second input gear meshed with said second drive gear and a third input gear, a third drive gear rotatably supported on said mainshaft and meshed with said third input gear, a first synchronizer clutch for selectively coupling one of said first and second input gears to said input shaft, and a second synchronizer clutch for selectively coupling one of said second and third drive gears to said mainshaft;a planetary gearset having a sun gear driven by said mainshaft, a ring gear, a carrier, and a pinion gear meshed with said sun gear and ring gear and which is rotatably supported on said carrier;an interaxle differential interconnecting said carrier to said front and rear output shafts, said interaxle differential having an input member driven by said carrier, a first output member driving said front output shaft, and a second output member driving said rear output shaft;a range clutch which can be selectively engaged to couple said ring gear to said mainshaft for driving said input member at a first speed ratio relative to said mainshaft, and said range clutch can further be selectively engaged to couple said ring gear to a stationary member for driving said input member at a second speed ratio relative to said mainshaft;a shift mechanism for controlling selective engagement of said constant mesh gearsets and said range clutch to establish a plurality of forward and reverse gears; anda transfer clutch for automatically controlling speed differentiation and torque biasing between said front and rear output shafts in response to the occurrence of slip therebetween.