Patent ID: 6402652
Filing Date: 2002-06-11
Classification: B60K,F16H

Abstract:
transmission for a four-wheel drive vehicle including an engine and front and rear drivelines, comprising:an input shaft driven by the engine; an intermediate shaft; a continuously variable transmission unit operably coupled said input shaft to said intermediate shaft and including a first differential and a first drive mechanism, said first differential having a first component driven by said input shaft, a second component driving said intermediate shaft, and a third component, said first drive mechanism includes a first worm gear fixed to said third component, a first worm meshed with said first worm gear, and a first motor for driving said first worm; a rear output shaft adapted to be coupled to the rear driveline; a continuously variable range unit operably coupling said intermediate shaft to said rear output shaft and including a second differential and a second drive mechanism, said second differential having a first component driven by said intermediate shaft, a second component driving said rear output shaft, and third component, said second drive mechanism includes a second worm gear fixed to said third component, a second worm meshed with said second worm gear, and a second motor for driving said second worm; a front output shaft adapted to be coupled to the front driveline; and a torque transfer coupling for transferring drive torque from one of said intermediate shaft and said rear output shaft to said front output shaft to establish a four-wheel drive mode.