A downsized differential assembly having a simple structure, which can be mounted easily on automobiles. The differential assembly comprises a set of first to third gears arranged coaxially while being allowed to rotate relatively to one another. A first eccentric gear meshes with the first gear, a second eccentric gear meshes with the second gear, and a third eccentric gear meshes with the third gear, while being supported by an eccentric member in such a manner as to rotate around an eccentric axis which is offset from a rotational axis. Gear ratios between the first to third gears and the first to third eccentric gears are set to different values so that rotational speeds of the first gear and the second gear are reduced slower than that of the eccentric member.

Methods and systems are provided for selectively engaging an electric machine to an electric axle of a vehicle. In one example, a method may include engaging or disengaging the electric machine to a differential of the electric-axle by adjusting pressure in a piston coupled to an axle shaft of the electric-axle via a disconnect clutch.

Methods and systems are provided for selectively engaging an electric machine to an electric axle of a vehicle. In one example, a method may include engaging or disengaging the electric machine to a differential of the electric-axle by adjusting pressure in a piston coupled to an axle shaft of the electric-axle via a disconnect clutch.

An apparatus and method for diagnosing damage to drive-train hardware of a vehicle in which a disconnector may obtain speed of an auxiliary drive wheel motor of the vehicle and speed of a main drive wheel motor of the vehicle and determines damage to the drive-train hardware including the disconnector that controls whether to interrupt delivery of power through engagement or disengagement between auxiliary drive wheel motor-side drive-train hardware and auxiliary drive wheel-side drive-train hardware, based on whether a difference between the speed of the auxiliary drive wheel motor and the speed of the main drive wheel motor exceeds a threshold value, Accordingly, preventing divergence of motor RPM by diagnosing damage to the drive-train hardware of the vehicle.

An apparatus and method for diagnosing damage to drive-train hardware of a vehicle in which a disconnector may obtain speed of an auxiliary drive wheel motor of the vehicle and speed of a main drive wheel motor of the vehicle and determines damage to the drive-train hardware including the disconnector that controls whether to interrupt delivery of power through engagement or disengagement between auxiliary drive wheel motor-side drive-train hardware and auxiliary drive wheel-side drive-train hardware, based on whether a difference between the speed of the auxiliary drive wheel motor and the speed of the main drive wheel motor exceeds a threshold value, Accordingly, preventing divergence of motor RPM by diagnosing damage to the drive-train hardware of the vehicle.

A transfer for a four wheel drive vehicle includes first and second distribution mechanisms that respectively include first and second clutches configured to be controlled to a half-engaged state. The first and second distribution mechanisms distribute a portion of power outputted from a power source to a second transmission mechanism respectively through the first and second clutches. A first difference is different from a second difference. The first difference is a difference between a gear ratio from an input shaft of the first clutch to a first driving wheel and a gear ratio from an output shaft of the first clutch to a second driving wheel. The second difference is a difference between a gear ratio from an input shaft of the second clutch to the first driving wheel and a gear ratio from an output shaft of the second clutch to the second driving wheel.

There is provided a work vehicle including a partition wall to keep partition between a first space zone as part of an internal space of the transmission case in which a differential mechanism is located and a second space zone as part of the internal space which is adjacent to the first space zone. An upper space is disposed above the partition wall and configured to allow lubricating oil scooped up from the first space zone by a ring gear to flow in the second space zone. A flow-out path is disposed below the upper space and configured to allow the lubricating oil to flow out of the second space zone to the first space zone.

A deflector device includes a deflector body that is configured to be deployed in front of a front wheel of a vehicle by being rotated in a deploy direction and to suppress airflow onto the front wheel, and that is configured to be stowed in a body of the vehicle by being rotated in a stow direction; a drive member that is configured to transmit drive force; and a transmission member that is provided with a projection that protrudes in a radial direction thereof and that is configured to be engaged with the drive member such that drive force from the drive member is transmitted to the transmission member and the deflector body is rotated.

A deflector device includes a deflector body that is configured to be deployed in front of a front wheel of a vehicle by being rotated in a deploy direction and to suppress airflow onto the front wheel, and that is configured to be stowed in a body of the vehicle by being rotated in a stow direction; a drive member that is configured to transmit drive force; and a transmission member that is provided with a projection that protrudes in a radial direction thereof and that is configured to be engaged with the drive member such that drive force from the drive member is transmitted to the transmission member and the deflector body is rotated.

By driving a first electromagnetic solenoid and a second electromagnetic solenoid, if first cams of a first thrust force amplification mechanism and a second thrust force amplification mechanism are connected to non-rotary members, since second cams are rotated at rotating speeds that are proportional to a vehicle speed V, the relative rotations between the first cam and the second cam increase. Therefore, the first thrust force amplification mechanism and the second thrust force amplification mechanism can be actuated quickly, to thereby switch connection/disconnection states of the first connection/disconnection mechanism and the second connection/disconnection mechanism quickly.