A member joining structure for a differential device, the member joining structure includes a ring gear including a helical tooth extending in a rotation axis direction; a differential case that is rotated with the ring gear; and a first support that is disposed in a first position at a back surface corresponding to one end of a rotation axis of the ring gear and that connects the differential case and the ring gear, and a second support that is disposed in a second position at a back surface corresponding to another end in the rotation axis direction of the ring gear and that connects the differential case and the ring gear; wherein the first support and the second support are spaced apart from each other with a cavity therebetween.

A vehicular differential device includes a differential case, a ring gear, and a welded portion positioned on an abutting surface where the differential case and the ring gear are in contact with each other. The welded portion is configured to join the differential case and the ring gear for integral rotation of the differential case and the ring gear around a rotation axis of the vehicular differential device. The welded portion includes a plurality of welding surfaces positioned at predetermined intervals along a circumferential direction around the rotation axis.

A differential assembly includes a first case rotatable about an axis and defining a first mounting flange having a through hole and a second case abutting the first case to define a gear nest cavity therebetween. The second case further defines a second mounting flange having a through hole and formed to mate to the first mounting flange. The differential assembly also includes a ring gear mounted to the first mounting flange and fastener extending through the through hole of both the first mounting flange and second mounting flange into a fastener hole of the ring gear. Additionally, the first mounting flange is sandwiched between the second mounting flange and the ring gear.

In a differential device in which a working window is provided in a case main body of a differential case that can rotate around a first axis, when viewed on the projection plane, orthogonal to the first axis, among joining parts between a flange portion of the differential case and a ring gear, a specific joining part that is the closest to the working window is positioned further outward than an inner end part of the working window in a direction along a third axis orthogonal to the first axis and a pinion axis, and the working window is positioned further outward, in the direction along the third axis, than an imaginary straight line joining the specific joining part and the first axis. Accordingly, rigidity strength of the differential case is enhanced and concentration of stress is prevented from occurring in the working window of the case main body.

A servo includes a motor, an output shaft used to drive an external component and having an external lateral surface, a gear set arranged between the motor and the output shaft and used to transmit power from the motor to the output shaft. The gear set includes an output gear arranged around the output shaft. The output gear defines a through hole that allows the output shaft to pass therethrough. The through hole has an internal lateral surface facing the external lateral surface. The servo further includes a connection ring arranged around the output shaft between the external lateral surface and the internal lateral surface. The connection ring is used to connect the output gear to the output shaft when a load placed on the output shaft is less than a preset value, and disconnect the output gear from the output shaft when the load exceeds the preset value.

A differential assembly having a case and a ring gear. The ring gear is mounted to the case and may include a mounting flange and a set of teeth. The mounting flange may have a fastener hole. The set of teeth overhangs the fastener hole such that the set of teeth extend further toward the axis than at least a portion of the fastener hole.

A differential device is provided in which a differential case is dividedly formed into a pair of case half bodies, wherein the differential case is dividedly formed into a pair of case half bodies that are joined to each other in a state in which open ends thereof oppose each other in an axial direction, an inner peripheral face of at least one case half body is formed by turning while a rotational axis of a material to be machined is made to coincide with the rotational axis, and the one case half body has a wall part in which the position of an outside face thereof is determined so that an oil hole extending between an interior and an exterior of the one case half body is formed by the turning. In such differential device, the oil hole of the case half body is formed without an additional process.

A differential device includes: a differential case; a plurality of pinion shafts supported by the differential case and that is disposed on a first axis and a second axis orthogonal to the first axis; a first pinion gear and a second pinion gear that are each rotatably supported by the plurality of pinion shafts and that are disposed on the first axis, and a third pinion gear and a fourth pinion gear that are each rotatably supported by the plurality of pinion shafts and that are disposed on the second axis; and a first side gear and a second side gear that mesh with the first to fourth pinion gears and that are preloaded toward the first to fourth pinion gears. The number of teeth of the first side gear and second side gear is configured to be the 4N+2 in which N is an integer.

A method of controlling an axle assembly. At least one wheel hub may be operatively connected to a differential assembly having a ring gear when the ring gear does not receive torque from a torque source. Torque from the wheel hub may rotate the ring gear and the ring gear may provide splash lubrication.

A differential assembly is provided to include a two-piece differential carrier, a differential gearset installed within a gearset chamber formed in the differential carrier, and a ring gear. An interlocking feature mechanically interconnects the ring gear to the first and second case members of the two-piece differential carrier and defines first and second weldment junctions. A first weld seam is located in the first weldment junction and connects the ring gear to the first case member while a second weld seam is located in the second weldment junction and connects the ring gear to the second case member.