The invention relates to a differential or transfer gearbox (10) in a motor vehicle, a method of production and the use of the differential or transfer gearbox (10). The differential or transfer gearbox (10) comprises a differential case (12) in which differential side gears (18, 20) and differential gears (22, 24) are accommodated. Each differential side gear (18) drives a first axle shaft (14) or a second axle shaft (16). A ring gear (32, 60) is driven by an input shaft (34) and mounted for conjoint rotation with the differential case (12). The ring gear (32, 60) is interlockingly connected to the differential case (12) of the differential or transfer gearbox (10).

This ferritic spheroidal graphite cast iron contains 3.0% to 3.6% by mass of C, 4.0% to 5.0% by mass of Si, 0.020% to 0.10% by mass of Mg, 1.0% or less of Mn, 0.10% by mass or less of P, and 0.015% by mass or less of S, with the balance being Fe and inevitable impurities.

A differential assembly is disclosed herein. The differential assembly includes a case, a weld ring and a ring gear. The ring gear and case may comprise dissimilar materials. The case may be overmolded onto the weld ring. The weld ring may be welded to the ring gear such that the ring gear is attached to the case.

A transmission device includes a power-transmission case having a carrier of a reduction gear and a differential case joined to the carrier is supported in a transmission case via case support bearings, a specific planetary gear portion of a planetary gear is disposed on one side of a differential mechanism in an axial direction, and the specific case support bearing is disposed on the other side thereof An oil passage-forming body is provided on an inner wall of the transmission case, the oil passage-forming body comprising an oil collection part that opens upward and can collect lubricating oil splashed up in an area around the specific planetary gear portion within the transmission case accompanying rotation of the power-transmission case, and an oil reservoir part that is continuous from the oil collection part, stores lubricating oil collected by the oil collection part, and supplies the lubricating oil to the specific case support bearing.

A ring gear assembly includes a ring gear, a gear box case, and a set of bolts. The ring gear includes a set of gear teeth inside the ring gear and arranged in a circle around the ring gear axis. The ring gear further includes a set of flanges arranged along at least one side of the ring gear. Each flange has a respective flange bolt hole therethrough, and each flange bolt hole has a respective bolt axis that is oriented perpendicular to the ring gear axis. The gear box case has a set of gear box bolt holes therethrough, each gear box bolt hole corresponding to a respective one of the flange bolt holes. Each of the bolts passes through a respective one of the gear box bolt holes and its corresponding flange bolt hole to fasten the ring gear to the gear box case.

An axle assembly comprising a differential carrier including an upper portion coupled with a lower portion, the upper portion comprising a planar surface defining a first hollow protrusion and a second hollow protrusion. The first hollow protrusion and the second hollow protrusion each define an arcuate cavity. An input shaft is coupled with a pinion gear drivingly engaged with a ring gear at least partially disposed within the first hollow protrusion. A differential case having a first portion and a second portion is at least partially disposed in the second hollow protrusion. The ring gear is welded to an exterior surface of said differential case first portion. A plurality of axially extending slots are defined by an interior surface of the differential case first portion. An annular canister having radially extending lugs disposed on an outer surface thereof, is disposed within said differential case. The lugs are in driving engagement with the plurality of differential case slots. A plurality of apertures are radially disposed through the canister, and a plurality of pinion shafts are disposed through and drivingly engaged with the canister apertures. A pinion gear is disposed on each of the pinion shafts. A pair of side gears is in driving engagement with the pinion gears. A first output shaft is in driving engagement with one of the pair of side gears, and a second output shaft is in driving engagement with the other of the pair of side gears.

A differential device includes a differential case (10) that has a flange portion (11) and a differential ring gear (40) that has a tooth portion, a fixed and supported portion (45), and a coupling portion. The differential case (10) has a first abutting surface (10a) and a restricting portion (10b). The differential ring gear (40) has a second abutting surface (40a) and an abutting portion (40b). A welding portion that is formed by welding the flange portion (11) of the differential case (10) and the fixed and supported portion (45) of the differential ring gear (40) is disposed at a position that is different from an abutting part between the first abutting surface (10a) and the second abutting surface (40a) and an abutting part between the restricting portion (10b) and the abutting portion (40b).

A differential assembly is disclosed herein. The differential assembly includes a case, a weld ring and a ring gear. The ring gear and case may comprise dissimilar materials. The case may be overmolded onto the weld ring. The weld ring may be welded to the ring gear such that the ring gear is attached to the case.

A differential device includes a ring gear having a center axis of the ring gear. A pinion shaft is provided in the ring gear such that a shaft axis of the pinion shaft is substantially perpendicular to the center axis and substantially coaxial with a diameter of the ring gear. The pinion shaft is rotatable together with the ring gear around the center axis. A first attaching member is connected to the ring gear and has a first fitting hole into which a first end portion of the pinion shaft is fitted. A second attaching member is connected to the ring gear and has a second fitting hole into which a second end portion of the pinion shaft is fitted.

A differential apparatus includes a differential mechanism, a differential case that accommodates the differential mechanism, and a clutch mechanism that transmits a driving force between the differential case and the differential mechanism. The clutch mechanism includes a slide member movable inside the differential case in an axial direction and an actuator. The slide member has a first meshable portion at one end in the axial direction, is allowed move relative to the differential mechanism in the axial direction, and is prevented from rotating relative to the differential mechanism. The differential case includes a first case member and a second case member that are united to form the differential case. The first case member integrally includes a second meshable portion and a flange portion that the ring gear is fastened to. When the actuator is activated the first meshable portion meshes with the second meshable portion so that the differential case and the slide member are coupled to present a relative rotation between the differential case and the slide member.