A differential device is provided with: an input member; a gear set with output gears to transmit torque from the input member to the output gears while allowing differential motion therebetween; a first clutch for limiting the differential motion; a first pressure pressing on the first clutch; a first cam mechanism for pressing the first pressure plate toward the first clutch; a second clutch, when connected, drivingly connecting the output gears with the input member; a second pressure plate for engaging the second clutch; and a rotatable driver disk including a pressing member so coupled with the cam mechanism as to, from a first position to a second position, rotate the first cam mechanism together and to, from the second position to a third position, allow the first cam mechanism to create rotational difference relative to the pressing member, thereby engaging the second clutch.

A differential assembly that includes a differential input member, a differential gear set, a first clutch, and a second clutch. The differential input member is rotatable about a differential axis and defines an internal cavity. The differential gear set is received in the differential cavity and includes first and second side gears. The first clutch has a plurality of first clutch plates and a plurality of second clutch plates. The first clutch plates are rotatably coupled to the differential input member. The second clutch plates are interleaved with the first clutch plates and are rotatably coupled to the first side gear. The second clutch is selectively operable to non-rotatably couple one of the first and second side gears to the differential input member.

A differential includes a differential case; a side gear; a pinion configured for meshing engagement with the side gear; and a pinion housing configured to support the pinion. The pinion housing includes a first face; a second face opposing the first face; a first projection located on the first face; and a second projection located on the second face. The pinion housing also includes an aperture or hole extending radially inwardly from an outer radial surface of the generally annular ring; and a channel extending from the first face to the second face, wherein the channel is substantially radially aligned with the aperture or hole. In embodiments, the pinion housing includes one or more transfer formations configured to transfer torque from the differential case, and the pinion housing is configured to permit movement in an axial direction between a pair of side gears.

A differential transmission for transmitting a torque to an axle of a motor vehicle, has at least one driveshaft and at least one output shaft, which are connectable in torque-transmitting manner via a clutch within a housing of the differential transmission, wherein the clutch is actuatable via an actuating device, wherein the actuating device is mounted on the housing, wherein the at least one output shaft is mounted in a rotatable manner via a bearing, wherein the bearing is mounted on the actuating device; wherein a stop is arranged on the at least one output shaft such that an actuating force that is provided for actuating the clutch and acts at least in an axial direction is supported on the stop at least via the actuating device and the bearing.

A differential apparatus includes a differential device, and a differential restricting portion configured to restrict a differential operation of the differential device. The differential device includes a differential case which is rotatably disposed, a differential gear which is rotatable while being supported by the differential case and revolves by rotation of the differential case, and a pair of output gears which are meshed with the differential gear and are rotatable relative to each other. The output gears include a gear member provided with a gear portion, and an output member including an output portion configured to output a driving force inputted to the output gears. A cam portion is provided between the gear member and the output member. The differential restricting portion is provided between the differential case and the output member.

A differential apparatus includes a differential device, and a differential restricting portion configured to restrict a differential operation of the differential device. The differential device includes a differential case which is rotatably disposed, a differential gear which is rotatable while being supported by the differential case and revolves by rotation of the differential case, and a pair of output gears which are meshed with the differential gear and are rotatable relative to each other. The output gears include a gear member provided with a gear portion, and an output member including an output portion configured to output a driving force inputted to the output gears. A cam portion is provided between the gear member and the output member. The differential restricting portion is provided between the differential case and the output member.

A transmission device includes one transmission member having a first axis, the other transmission member being capable of revolving around the first axis while rotating around a second axis eccentric from the first axis, and a transmission mechanism provided between the two transmission members, and that has one of transmission grooves provided in the one transmission member and having a wave-shaped annular form with the first axis, the other transmission groove provided in the other transmission member, having a wave-shaped annular form with the second axis, and a plurality of rolling bodies disposed in a plurality of intersecting parts between the two transmission grooves, wherein opposite side faces of a retainer are formed so as to be rotatably slidable with respect to the transmission members, and oil reservoir recesses are provided to one opposing face of the mutually opposing faces of the transmission members and the retainer.

A transmission device includes one transmission member having a first axis, the other transmission member being capable of revolving around the first axis while rotating around a second axis eccentric from the first axis, and a transmission mechanism provided between the two transmission members, and that has one of transmission grooves provided in the one transmission member and having a wave-shaped annular form with the first axis, the other transmission groove provided in the other transmission member, having a wave-shaped annular form with the second axis, and a plurality of rolling bodies disposed in a plurality of intersecting parts between the two transmission grooves, wherein opposite side faces of a retainer are formed so as to be rotatably slidable with respect to the transmission members, and oil reservoir recesses are provided to one opposing face of the mutually opposing faces of the transmission members and the retainer.

A differential device is provided in which a first wave number (Z1) of a first hypo groove part on an input plate, a second wave number (Z2) of a first epi groove part on a first differential plate and opposing the first hypo groove part, a third wave number (Z3) of a second hypo groove part on the first differential plate and on the opposite side from the first epi groove part, and a fourth wave number (Z4) of a second epi groove part on a second differential plate and opposing the second hypo groove part are set as Z1=8, Z2=Z3=6 and Z4=4, or as Z1=Z4=6, Z2=4, Z3=8. Such differential device enables equal torque distribution and equal differential rotation via a cycloid reduction mechanism without using a bevel gear or a center plate.

A differential device is provided in which a first wave number (Z1) of a first hypo groove part on an input plate, a second wave number (Z2) of a first epi groove part on a first differential plate and opposing the first hypo groove part, a third wave number (Z3) of a second hypo groove part on the first differential plate and on the opposite side from the first epi groove part, and a fourth wave number (Z4) of a second epi groove part on a second differential plate and opposing the second hypo groove part are set as Z1=8, Z2=Z3=6 and Z4=4, or as Z1=Z4=6, Z2=4, Z3=8. Such differential device enables equal torque distribution and equal differential rotation via a cycloid reduction mechanism without using a bevel gear or a center plate.