A transfer includes: an input shaft; an output shaft; a high-low switching mechanism; an output member whose output destination is different from output destination of the output shaft; a clutch for transmitting a power to the output member; a first transmitting mechanism for transmitting movement of an internally threaded member to the clutch; and a drum cam having a cam groove. The cam groove includes a first inclined section that causes the high-low switching mechanism to be switched between a high-speed gear stage and a low-speed gear stage, and a second inclined section that causes the first transmitting mechanism to be switched between (i) a separated position in which the first transmitting mechanism is separated from the clutch and (ii) a contact position in which the first transmitting mechanism is in contact with the clutch, while the high-speed gear stage is established in the high-low switching mechanism.

A torque transfer device for a powertrain of a vehicle includes a shaft, a pump, and an actuator. The shaft transfers torque from a drive source to a wheel of the vehicle. The pump includes a rotary component and a housing that surround the shaft. The rotary component is selectively coupleable to the shaft to be rotated thereby to operate the pump. The actuator includes a cam mechanism that selectively couples the rotary component to the shaft.

A transfer case for a normally rear wheel drive vehicle with selective four wheel drive capabilities is provided. The transfer case has an intermediate gear driven lubrication pump, wherein the machining required for the lubrication pump is almost exclusively conducted from an interior side of the rear shell. The transfer case of the present invention also eliminates the requirement for a cover plate for the pump and an external lubrication tube. The transfer case of the current invention has an internal lubrication pump outlet which has a portion extending in a reinforcing mound of the rear shell thereby providing greater stiffness to a portion of the rear shell supporting the main input shaft rear bearings.

A control apparatus that controls a four-wheel drive vehicle in which a driving force is transmitted to rear wheels via a dog clutch, a propeller shaft, and a driving force transmission apparatus is configured to, when switching to a four-wheel drive mode, reduce a difference in rotation speeds of an intermediate rotational member and a ring gear member by a frictional force between a friction surface of a friction member, which is configured such that its rotation relative to the intermediate rotational member is restricted, and a target frictional slide surface of the ring gear member, and then couple the intermediate rotational member and the ring gear member by a clutch member in a state in which engagement forces of friction clutches configured to transmit the driving force between each of first and second output rotational members and the intermediate rotational member of the driving force transmission apparatus are set to engagement forces that allow their relative rotation.

Methods and systems for controlling shifting of a tandem axle assembly are described. In one example, a method comprises adjusting torque applied at an input connection of a first axle of a tandem axle assembly based on a clutch disengagement torque while transitioning the first axle between shift settings.

A behavior control device for a four-wheel drive vehicle that is applied to a vehicle which comprises a center differential device that transmits a driving force from a driving device to front and rear wheel rotation shafts, and permits differential of the front and rear wheel rotation shafts; and a braking force distribution ratio of the front and rear wheels being set to a value in which a proportion of front wheels is larger than that in an ideal distribution ratio. The behavior control device comprises a differential limiting device that changes the limitation degree of a differential between the wheel rotation shafts, and a control unit that controls the differential limiting device to increase the limitation degree of the differential during the vehicle is braked as a degree of an understeer state of the vehicle is high.

A controller of a four-wheel drive vehicle includes a first operation part that switches drive mode of the vehicle; a second operation part that switches off-road traveling modes indicating traveling modes for off-road driving of the vehicle; a transfer controller that controls the arrangement of a transfer device in accordance with the drive mode; a detector that detects the arrangement of the transfer device; a determiner that determines whether a switching of the traveling modes is permitted or not based on the drive mode and the arrangement detected by the detector; and a setter that sets the traveling modes of the vehicle based on the detected arrangement and input operations to the first operation part and the second operation part when the determiner determines the switching of the traveling modes is permitted, and maintains the current traveling mode when the determiner determines the switching of the traveling modes is not permitted.

A controller for a four-wheel drive vehicle includes a multi-information display, a first operation part for switching of drive modes, a second operation part for switching of off-road traveling modes, a transfer controller that controls the arrangement of a transfer device based on the drive mode, a detector that detects the arrangement of the transfer device, a setter that sets the traveling mode based on the detected arrangement and input operations to the first and second operation parts, and a display controller that instructs the multi-information display to display the drive mode based on the input operation to the first operation part and the detected arrangement and to display the traveling mode set by the setter. The display controller displays the drive mode and the traveling mode on a window when the switched drive mode is a locked drive mode and simultaneously turns off these modes after a predetermined time.

A utility vehicle is configured for independently controlling torque at each of the ground-engaging members.

A drive train of a motor vehicle between a drive unit and a first wheel axle and a second wheel axle is disclosed, the second wheel axle consisting at least of a first sub-axle and a second sub-axle, and the first and the second sub-axle being connected to a differential for torque distribution. The differential is an individual differential which is operatively connected to the drive unit via a drive shaft and which can optionally be operatively connected to the first wheel axle for torque distribution.