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 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 gearless differential for distributing power from a motor to two follower shafts with ends connected to opposite wheels and to opposed outer disks held in position with a journal mounted casing having corresponding identical regular polygonal raceways with asymmetric sections surrounding a central drive disk there between with equidistant radial slots each holding one cylinder or roller bearing to radially reciprocate as they race along the raceways in a slippage mode where one wheel loses traction; and in a drive mode where the central drive disk power input drives both outer disks connected to the two follower shafts transferring torque evenly to both wheels so there is no movement of the cylinders or roller bearings in the raceways.

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 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 speed reduction apparatus supports a third crown gear that undergoes wave motion. The speed reduction apparatus includes: a first crown gear; a second crown gear; a third crown gear having opposing teeth facing the first crown gear and opposing teeth facing the second crown gear, back to back; and cam units and that cause the third crown gear to undergo wave motion. The cam units and have a first cam on the first crown gear side with respect to the third crown gear, and a second cam on the second crown gear side with respect to the third crown gear. The first and second cams sandwich the third crown gear. A first rolling element between the first cam and the third crown gear is capable of rolling motion, and a second rolling element between the second cam and the third crown gear is capable of rolling motion.

A power transmitting device includes a first transmission member, an eccentric rotating member, a second transmission member disposed adjacent to the first transmission member, and a transmission mechanism that is provided between the first and second transmission members is formed from a hypotrochoidal first transmission groove and an epitrochoidal second transmission groove formed in one and the other of opposing faces of the first and second transmission members, and a sphere that carries out transmission of torque between the first and second transmission grooves while rolling in the two transmission grooves, wherein the first and second transmission grooves are formed so that each of the transmission grooves and the sphere make contact via two contact points, and a locus of the contact point of each transmission groove having a minimum radius of curvature set to be larger than of a distance between the two contact points of each sphere.

A transmission device includes first and second rotation transmission members capable of relative rotation around a first rotary axis. A first eccentric unit is rotatably supported on an eccentric shaft portion on a second rotary axis eccentric to a main shaft portion of an eccentric shaft. A counterweight incapable of relative rotation with respect to the eccentric shaft is arranged between the first eccentric unit and a second rotation transmission member connected to the first eccentric unit. The orbit of the counterweight overlaps a portion of the orbits of multiple intermediate members, the orbits of which are defined by groove parts formed on the opposing surfaces of the first rotation transmission member and the first eccentric unit, and the opposing surfaces of the second rotation transmission member and the second eccentric unit, or, the orbit of the counterweight is outside of the orbits of the intermediate members.

A speed reduction apparatus supports a third crown gear that undergoes wave motion. The speed reduction apparatus includes: a first crown gear; a second crown gear; a third crown gear having opposing teeth facing the first crown gear and opposing teeth facing the second crown gear, back to back; and cam units and that cause the third crown gear to undergo wave motion. The cam units and have a first cam on the first crown gear side with respect to the third crown gear, and a second cam on the second crown gear side with respect to the third crown gear. The first and second cams sandwich the third crown gear. A first rolling element between the first cam and the third crown gear is capable of rolling motion, and a second rolling element between the second cam and the third crown gear is capable of rolling motion.

A differential assembly for a vehicle includes a drive train for transferring motive power from an engine drive member to the right and left drive shafts which are coupled, respectively, to ground engaging members of the vehicle. The drive train includes a rotating element operatively engaged to the drive member and to the right and left drive shafts. The differential assembly further includes a first speed sensor is arranged to measure rotational speed of (i) the rotating element or (ii) one of the right and left drive shafts, and a second speed sensor arranged to measure rotational speed of one of the right and left drive shafts. The second speed sensor arranged to measure rotational speed of the other of the right and left drive shafts when the first speed sensor is arranged to measure rotational speed of one of the right and left drive shafts.