Patent ID: 6929577
Filing Date: 2005-08-16
Classification: B60K,F16H

Abstract:
1. A transfer case comprising: an input shaft; first and second output shafts; a range unit driven by said input shaft and having an output component driven at a reduced speed relative to said input shaft; a dog clutch operable in a first range position to couple said input shaft to said first output shaft for establishing a high-range drive connection, said dog clutch is further operable in a second range position to couple said output component of said range unit to said first output shaft for establishing a low-range drive connection; a mode clutch including a clutch pack operably disposed between said first and second output shafts and a pressure plate moveable between a first mode position whereat a minimum clutch engagement force is exerted on said clutch pack and a second mode position whereat a maximum clutch engagement force is exerted on said clutch pack; an actuation mechanism for coordinating movement of said dog clutch and said pressure plate, said actuation mechanism including a geartrain having an input gear and an output gear, a motor driving said input gear, a range actuator assembly driven by said output gear for moving said dog clutch between its first and second range positions, and a mode actuator assembly driven by said output gear for moving said pressure plate between its first and second mode positions, said output gear being rotatable through a first range of travel for causing said range actuator assembly to move said dog clutch between its first and second range positions while said mode actuator assembly maintains said pressure plate in its first mode position, a second range of travel for causing said range actuator assembly to maintain said dog clutch in its first range position while said mode actuator assembly moves said pressure plate between its first and second mode positions, and a third range of travel for causing said range actuator assembly to maintain said dog clutch in its second range position while said mode actuator assembly moves said pressure plate between its first and second mode positions; and a control system for controlling actuation of said motor.