A diff-lock operation shaft 50 is supported by a case 11 in such a manner as to be rotatable around an axis P1 of the diff-lock operation shaft 50 and operates a diff-lock section 48 to a lock position A2 by being rotated, and a first coil spring 51 is wound around the outer surface of the diff-lock operation shaft 50 concentrically with the diff-lock operation shaft 50, and is linked at one end portion 51b to the diff-lock operation shaft 50 and at another end portion 51a to linking members 55 and 56. The first coil spring 51 is twisted around the axis P1 via the linking members 55 and 56 by the manual operation tool 58 being operated, and the diff-lock operation shaft 50 is rotated via the first coil spring 51.

A diff-lock operation shaft 50 is supported by a case 11 in such a manner as to be rotatable around an axis P1 of the diff-lock operation shaft 50 and operates a diff-lock section 48 to a lock position A2 by being rotated, and a first coil spring 51 is wound around the outer surface of the diff-lock operation shaft 50 concentrically with the diff-lock operation shaft 50, and is linked at one end portion 51b to the diff-lock operation shaft 50 and at another end portion 51a to linking members 55 and 56. The first coil spring 51 is twisted around the axis P1 via the linking members 55 and 56 by the manual operation tool 58 being operated, and the diff-lock operation shaft 50 is rotated via the first coil spring 51.

An epicyclic gear train for a servomotor system includes a case, and, positioned in the case, a planet carrier carrying planet gears, a ring gear, and a sun gear. The epicyclic gear train includes a control for changing input and output speed ratio in response to an input applied from outside the case.

A transaxle includes: an axle housing in which an input gear is rotatably supported; a differential casing that is contained in the axle housing while being rotatably supported relative to the axle housing; first and second side gears as a pair of spur gears that are contained in the differential casing, coaxially arranged, relatively rotatable with each other, and rotatable relative to the differential casing; a group of pinions as spur gears that are rotatably supported, in the differential casing, by rotational shafts that are in parallel with axes of the first and the second side gears in the differential casing, the group of pinions transmitting power between the first side gear and the second side gear; and a final gear having a ring shape that is contained in the axle housing, meshes with the input gear, incorporates the differential casing, and is relatively unrotatably coupled to the differential casing.

An epicyclic gear train for a servomotor system includes a case, and, positioned in the case, a planet carrier carrying planet gears, a ring gear, and a sun gear. The epicyclic gear train includes a control for changing input and output speed ratio in response to an input applied from outside the case.

A transaxle includes: an axle housing in which an input gear is rotatably supported; a differential casing that is contained in the axle housing while being rotatably supported relative to the axle housing; first and second side gears as a pair of spur gears that are contained in the differential casing, coaxially arranged, relatively rotatable with each other, and rotatable relative to the differential casing; a group of pinions as spur gears that are rotatably supported, in the differential casing, by rotational shafts that are in parallel with axes of the first and the second side gears in the differential casing, the group of pinions transmitting power between the first side gear and the second side gear; and a final gear having a ring shape that is contained in the axle housing, meshes with the input gear, incorporates the differential casing, and is relatively unrotatably coupled to the differential casing.

An actuator assembly comprises a housing part with a sleeve-shaped portion and a flange-shaped portion, a ball ramp mechanism with a support ring and an setting ring, wherein at least the support ring is radially spaced from an outer face of the sleeve-shaped portion; an actuating element which is held axially movably coaxially to the ball ramp mechanism on the flange-shaped portion of the housing part, an annular gap being formed between the outer face of the sleeve-shaped portion and the actuating element; and a spring element which is arranged radially outside an actuating face of the actuating element axially between the housing part and the actuating element in order to exert a restoring force on the actuating element. A differential assembly with such an actuator assembly is provided.

An assembly adapted to replace an automobile differential's spider gears, locking the axles together. The present invention comprises a pair of outer drive flange members that are adapted to engage with a pair of wedge locking members within the carrier of an automobile differential, replacing the differential's stock planetary or spider gears. The present assembly locks the rotation of the rear axles together, applying power equally to both wheels and enhancing the performance of the automobile during competitive drag racing events, without requiring expensive custom installation from a specialist.

A differential device includes: (a) an input rotary member; (b) a pair of output rotary members; (c) a clutch for limiting rotations of the pair of output rotary members relative to each other; (d) a pressing member for pressing the clutch so as to cause the clutch to generate a torque that limits the rotations of the pair of output rotary members relative to each other; (e) an elastic member for applying a preload to the clutch such that the clutch generates an initial torque; (f) an adjuster for pressing the elastic member so as to cause the elastic member to apply the preload to the clutch and to change the preload; and (g) a fixture which is configured to fix the adjuster to a non-rotatable member so as to make the adjuster unrotatable relative to the non-rotatable member, and to release fixing of the adjuster to the non-rotatable member.

An actuator assembly comprises a housing part with a sleeve-shaped portion and a flange-shaped portion, a ball ramp mechanism with a support ring and an setting ring, wherein at least the support ring is radially spaced from an outer face of the sleeve-shaped portion; an actuating element which is held axially movably coaxially to the ball ramp mechanism on the flange-shaped portion of the housing part, an annular gap being formed between the outer face of the sleeve-shaped portion and the actuating element; and a spring element which is arranged radially outside an actuating face of the actuating element axially between the housing part and the actuating element in order to exert a restoring force on the actuating element. A differential assembly with such an actuator assembly is provided.