TWO-SPEED ACTIVE TRANSFER CASE

摘要

A two-speed active transfer case is disclosed having an input shaft adapted to receive drive torque from a powertrain, a rear output shaft adapted for connection to a rear driveline and aligned with the input shaft for rotation about a first rotary axis, a front output shaft adapted for connection to a front driveline and aligned for rotation about a second rotary axis, a transfer mechanism driven by the rear output shaft, a two-speed range mechanism operably disposed between the input shaft and the rear output shaft, a range shift mechanism for controlling operation of the two-speed range mechanism, a mode mechanism operably disposed between the transfer mechanism and the front output shaft, and a mode shift mechanism for controlling operation of the mode mechanism.

主权项

1. A transfer case for use in a four-wheel drive motor vehicle having a powertrain and first and second drivelines, comprising:
an input shaft adapted to receive drive torque from the powertrain and aligned for rotation about a first axis; a first output shaft adapted to be interconnected to the first driveline and aligned for rotation about said first axis; a second output shaft adapted to be interconnected to the second driveline and aligned for rotation about a second axis; a transfer mechanism having a first transfer component fixed for rotation with said first output shaft about said first axis, and a second transfer component rotatably supported on said second output shaft for rotation about said second axis, said second transfer component being driven by said first transfer component; a range mechanism including a reduction unit and a range clutch, said reduction unit being driven at a reduced speed relative to said input shaft, said range clutch operable in a first range position to establish a drive connection between said input shaft and said first output shaft and further operable in a second position to establish a drive connection between said reduction unit and said first output shaft; a range shift mechanism controlling movement of said range clutch between said first and second range positions; a mode mechanism disposed between said second transfer component and said second output shaft, said mode mechanism including a mode clutch having a first clutch member coupled to said second transfer component, a second clutch member coupled to said second output shaft, a multi-plate clutch pack disposed between said first and second clutch members, and an apply member moveable into and out of engagement with said clutch pack; a mode shift mechanism for controlling movement of said apply member relative to said clutch pack so as to control the magnitude of a clutch engagement force applied to said clutch pack and concurrently control the amount of drive torque transferred from said first output shaft through said transfer mechanism and said mode clutch to said second output shaft; and a power-operated shift actuator for controlling actuation of said mode shift mechanism.