Abstract: A transfer case includes a two-speed range unit, a friction clutch, an actuation mechanism and a control system. The actuation mechanism includes an electric motor, a geartrain driven by the motor, a range actuator assembly and a mode actuator assembly. The range actuator assembly includes a driveshaft driven by the geartrain, a cam driven by the driveshaft and a shift fork having a follower retained in a groove formed in the cam and a fork engaging a shift collar associated with the range unit. The mode actuator assembly has a face cam with spiral cam surfaces and a control gear with radially-moveable rollers engaging the cam surfaces. The control gear is rotatively driven by the geartrain. The face cam is axially moveable for controlling engagement of the friction clutch. An anti-rotation mechanism limits rotation of the face cam in response to continued rotation of the control gear.

Abstract: A power transmission device includes a rotary input member receiving drive torque from a source of torque, a rotary output member for providing drive torque to an output device and a torque transfer mechanism for transferring drive torque between the input member and the output member. The torque transfer mechanism includes a friction clutch assembly operably disposed between the input member and the output member and a hydraulic clutch actuation system operable for applying a clutch engagement force to the friction clutch assembly. The hydraulic clutch actuation system includes an electric motor drivingly coupled to the hydraulic actuator. The hydraulic actuator includes a first piston biasedly engaged by a spring, slidably positioned within a housing and operable to supply pressurized fluid to a second piston. Supply of pressurized fluid to the second piston provides the clutch engagement force.

Abstract: A power transmission device includes a rotary input member adapted to receive drive torque from a source of torque, a rotary output member adapted to provide drive torque to an output device and a torque transfer mechanism operable to transferring drive torque from the input member to the output member. The torque transfer mechanism includes a friction clutch assembly operably disposed between the input member and the output member and a hydraulic clutch actuation system operable for applying a clutch engagement force to the friction clutch assembly. The hydraulic clutch actuation system includes an electric motor drivingly coupled to a first piston. The first piston is slidably positioned within the housing for supplying pressurized fluid to an accumulator. The pressurized fluid within the accumulator is in communication with a second piston to provide the clutch engagement force.

Abstract: A power transmission device includes a rotary input member receiving drive torque from a source of torque, a rotary output member for providing drive torque to an output device and a torque transfer mechanism for transferring drive torque between the input member and the output member. The torque transfer mechanism includes a friction clutch assembly operably disposed between the input member and the output member and a hydraulic clutch actuation system operable for applying a clutch engagement force to the friction clutch assembly. The hydraulic clutch actuation system includes an electromagnet and a piston operable to supply pressurized fluid and provide the clutch engagement force.

Abstract: A transfer case is provided and includes a first output shaft driven by a powertrain and operably interconnected with a first pair of wheels, a second output shaft selectively driven by the first output shaft and operably interconnected with a second pair of wheels and a transfer gear assembly operably disposed between the first output shaft and the second output shaft for transferring drive torque from the first output shaft to the second output shaft. The transfer gear assembly includes a first transfer gear in selective drive connection with the first output shaft, a second transfer gear in meshed engagement with the first transfer gear, a third transfer gear in drive connection with the second transfer gear and the second output shaft. A clutch pack is operably disposed between the first output shaft and the first transfer gear for selectively establishing drive connection therebetween.

Abstract: A power transfer system is provided and equipped with a torque transfer coupling which includes a clutch and a ball-screw actuator. The ball-screw actuator functions to axially translate an apply plate via a closed hydraulic system to operatively engage the clutch and vary the frictional engagement thereof.

Abstract: A transfer case is provided and includes a first output shaft driven by a powertrain and operably interconnected with a first pair of wheels, a second output shaft selectively driven by the first output shaft and operably interconnected with a second pair of wheels and a transfer gear assembly operably disposed between the first output shaft and the second output shaft for transferring drive torque from the first output shaft to the second output shaft. The transfer gear assembly includes a first transfer gear in selective drive connection with the first output shaft, a second transfer gear in meshed engagement with the first transfer gear, a third transfer gear in drive connection with the second transfer gear and the second output shaft. A clutch pack is operably disposed between the first output shaft and the first transfer gear for selectively establishing drive connection therebetween.

Abstract: A transfer case is provided and includes a first output shaft driven by a powertrain and operably interconnected with a first pair of wheels, a second output shaft selectively driven by the first output shaft and operably interconnected with a second pair of wheels and a transfer gear assembly operably disposed between the first output shaft and the second output shaft for transferring drive torque from the first output shaft to the second output shaft. The transfer gear assembly includes a first transfer gear in selective drive connection with the first output shaft, a second transfer gear in meshed engagement with the first transfer gear, a third transfer gear in drive connection with the second transfer gear and the second output shaft. A clutch pack is operably disposed between the first output shaft and the first transfer gear for selectively establishing drive connection therebetween.

Abstract: A power transfer system is provided and equipped with a torque transfer coupling which includes a clutch and a ball-screw actuator. The ball-screw actuator functions to axially translate an apply plate via a closed hydraulic system to operatively engage the clutch and vary the frictional engagement thereof.

Abstract: A transfer case is provided and includes a first output shaft driven by a powertrain and operably interconnected with a first pair of wheels, a second output shaft selectively driven by the first output shaft and operably interconnected with a second pair of wheels and a transfer gear assembly operably disposed between the first output shaft and the second output shaft for transferring drive torque from the first output shaft to the second output shaft. The transfer gear assembly includes a first transfer gear in selective drive connection with the first output shaft, a second transfer gear in meshed engagement with the first transfer gear, a third transfer gear in drive connection with the second transfer gear and the second output shaft. A clutch pack is operably disposed between the first output shaft and the first transfer gear for selectively establishing drive connection therebetween.

Abstract: A power transfer system is provided and equipped with a torque transfer coupling which includes a clutch and a ball-screw actuator. The ball-screw actuator functions to axially translate an apply plate via a closed hydraulic system to operatively engage the clutch and vary the frictional engagement thereof.

Abstract: A power transfer system is provided and equipped with a torque transfer coupling which includes a clutch and a ball-screw actuator. The ball-screw actuator functions to axially translate an apply plate via a closed hydraulic system to operatively engage the clutch and vary the frictional engagement thereof.

Abstract: A transfer case for use in a four-wheel drive vehicle. The transfer case has an input shaft supported for rotation about a first rotary axis, a first output shaft supported for rotation about a second rotary axis, a second output shaft supported for rotation about a third rotary axis, and a torque transfer arrangement for delivering drive torque from the input shaft to each of the first and second output shafts.

Abstract: A power transfer system for a four-wheel drive vehicle is having a part-time transfer case with its input angled relative to its outputs by means of a constant velocity (CV) universal joint. More specifically, the transfer case input includes a first rotary member adapted to be rotatably driven about the rotary axis of the transmission output shaft, a second rotary member supported for rotation about a second rotary axis that is angled relative to the first rotary axis, and a CV joint interconnecting the first and second rotary members. The transfer case outputs include a pair of rotary output members supported for relative rotation about a common third rotary axis that is offset from the second rotary axis. A torque transfer arrangement is provided for transferring torque from the transfer case input to its outputs. As such, the CV joint allows the transfer case to be angulated so that reduced departure angles are achieved with respect to the prop shaft connections.

Abstract: The present invention is directed to an improved power transfer system for use in four-wheel drive vehicles having a transfer case equipped with a torque transfer arrangement that is operable for automatically controlling the drive torque delivered to the front and rear drivelines of the vehicle and establishing an on-demand four-wheel drive mode.

Abstract: A power transfer system for a four-wheel drive vehicle is disclosed having a transfer case with its input angled relative to its outputs by means of a constant velocity (CV) universal joint. More specifically, the transfer case input includes a first rotary member adapted to be rotatably driven about the rotary axis of the transmission output shaft, a second rotary member supported for rotation about a second rotary axis that is angled relative to the first rotary axis, and a CV joint interconnecting the first and second rotary members. The transfer case outputs include a pair of rotary output members supported for relative rotation about a common third rotary axis that is offset from the second rotary axis. A torque transfer arrangement is provided for transferring torque from the transfer case input to its outputs. As such, the CV joint allows the transfer case to be angulated so that reduced departure angles are achieved with respect to the prop shaft connections.

Abstract: A power transfer system is disclosed for a four-wheel drive vehicle operable for permitting a vehicle operator to select between various full-time and part-time four-wheel drive modes. The power transfer system includes a transfer case equipped with a single-planetary gear reduction unit and a synchronized range shift mechanism operable for permitting the vehicle operator to shift on-the-fly for establishing full-time and part-time high-range and low-range four-wheel drive modes. The transfer case is also equipped with an electronically-controlled slip limiting/torque biasing arrangement including an interaxle differential and a transfer clutch operable for controlling the magnitude of speed differentiation and torque biasing across the interaxle differential.

Abstract: A power transfer system is disclosed having a drop box for connecting a motor vehicle's drivetrain to an offset driveline. The drop box has an input that is angled relative to its output by means of a constant velocity (CV) universal joint. More specifically, a first rotary member is coupled for driven rotation about the rotary axis of the transmission output shaft while a second rotary member is supported for rotation about a second rotary axis that is angled relative to the first rotary axis. A CV joint drivingly interconnects the second rotary member to the first rotary member. The drop box also includes a third rotary member adapted for connection to the driveline and which is supported for rotation about a third rotary axis that is offset from the second rotary axis. A drive connection interconnects the third rotary member to the second rotary member. The CV joint allows the drop box to be angulated so that a reduced departure angle is achieved with respect to the prop shaft connection.

Abstract: A power transfer system for a four-wheel drive vehicle having a full-time transfer case with its input angled relative to its outputs by means of a constant velocity (CV) universal joint. More specifically, the transfer case input includes a first rotary member adapted to be rotatably driven about the rotary axis of the transmission output shaft, a second rotary member supported for rotation about a second rotary axis that is angled relative to the first rotary axis, and a CV joint interconnecting the first and second rotary members. The transfer case outputs include a pair of rotary output members supported for relative rotation about a common third rotary axis that is offset from the second rotary axis. A torque transfer arrangement is provided for transferring torque from the transfer case input to its outputs. The CV joint allows the transfer case to be angulated so that reduced departure angles are achieved with respect to the prop shaft connections.

Abstract: A power transfer system for a four-wheel drive vehicle is disclosed having a part-time transfer case with its input angled relative to its outputs by means of a constant velocity (CV) universal joint. More specifically, the transfer case input includes a first rotary member adapted to be rotatably driven about the rotary axis of the transmission output shaft, a second rotary member supported for rotation about a second rotary axis that is angled relative to the first rotary axis, and a CV joint interconnecting the first and second rotary members. The transfer case outputs include a pair of rotary output members supported for relative rotation about a common third rotary axis that is offset from the second rotary axis. A torque transfer arrangement is provided for transferring torque from the transfer case input to its outputs. As such, the CV joint allows the transfer case to be angulated so that reduced departure angles are achieved with respect to the prop shaft connections.