Abstract: The invention relates to a lubricating device for a variable speed transmission with an integrated interaxle differential for motor vehicles, on the shaft of the transmission there being at least one synchronizer clutch for shifting one or two lower (slower) gear ratios and the interaxle differential, and the synchronizer clutch and the interaxle differential being supplied with lubricating oil by way of a central longitudinal channel in the shaft and by way of radial channels and/or radial gaps branching off from it. For improved adaptation of the lubricating oil supply in defined driving states of the motor vehicle, there are means which are integrated into the longitudinal channel and which change the lubricating oil supply to the synchronizer clutch and the interaxle differential as a function of the driving speed.

Abstract: A gearbox arrangement comprising a main gearbox portion, a first gearbox section, and a second gearbox section. The first gearbox section comprises a differential assembly, wherein the differential assembly comprises a ring gear. The ring gear rotates about an axis. The second gearbox section comprises a power take-off assembly and a bearing plate defined by a plane. The axis and plane are parallel to one another. The gearbox arrangement further comprises a separator mounted to at least one of the first and second gearbox sections. Further, a guide is contained within at least one of the first and second gearbox sections.

Abstract: A differential case for a vehicle and a differential device for a vehicle supplying sufficiently lubrication oil to a gear peripheral portion as a supported portion of a pinion gear in order to prevent a bonding of the gear peripheral portion of the pinion gear. The differential case or the differential device for the vehicle comprises a pair of pinion gear supporting portions (10, 11) supporting slidably a pair of pinion gears (3, 4), and a lubrication oil introducing portion (7, 8) provided around a peripheral portion of the pair of pinion gears (3, 4) to introduce lubrication oil into a clearance between sliding faces of the pair of pinion gears (3, 4) and pinion gear supporting faces (10a, 11a, 10b, 11b) of the pair of pinion gear supporting portions (10, 11).

Abstract: A differential with a differential case, a differential gear set and a clutch pack. Apertures are formed axially through the differential case and the clutch pack to facilitate the introduction of lubricant through the differential case and into the clutch pack. An axle assembly and a method of operating an axle assembly are also provided.

Abstract: An embodiment of a differential device of the present invention comprises a pair of side gears and a pair of pinion gears housed inside a differential case, with the pinion gears supported by a pinion shaft fixed to the differential case at axial end sections thereof so as to be capable of sliding freely thereabout. Lubricating oil channels are provided that pass through each of the end sections of the pinion shaft in the axial direction thereof. One end of each lubricating oil channel opens to the exterior of the differential case at a shaft-end corner section of the pinion shaft corresponding to an upstream side thereof in a direction of rotation of the differential case, and another end opens to a sliding surface of the pinion shaft with respect to one of the pinion gears. The differential device also comprises a mechanism for providing lubricating oil to the lubricating oil channels upon rotation of the differential case.

Abstract: A differential gear set includes a pinion gear that at least a groove having a inner planar surface, at least a gear is formed in an exterior circumference thereof and at least a pinion shaft in which an end portion is inserted into the groove such that an end surface faces the inner surface of the groove and a planar portion is formed by cutting off in one side of an exterior circumference thereof corresponding to the interior circumference of the groove.

Abstract: A differential device for differentially distributing a driving force to axles along an axis is disclosed. The differential device has a case being capable of rotation about the axis, which includes a flange configured to receive the driving force and a shaft crossing the case perpendicularly to the axis; an opening defined by a peripheral border on an outer periphery of the case so as to allow access into the case, lateral extremities of which is deviated from a center of the shaft toward a direction opposite to the flange along the axis; and a differential gear set housed in and drivingly coupled to the case, the differential gear set including an input gear rotatable around the shaft and output gears so combined with the input gear as to differentially distribute the driving force to the output gears, the output gears being drivingly coupled to the axles.

Abstract: An axle assembly having an axle assembly with first and second sumps for holding a lubricant. A rotating ring gear associated with a differential can rotate through the lubricant in the first sump to cause a portion of the lubricant to cling to the ring gear. A portion of the lubricant that has clung to the ring gear can be removed from the ring gear and transferred to the second sump. The lubricant in the second sump can be drained to lubricate teeth of a pinion that is in meshing engagement with the ring gear and/or to lubricate bearings that support the pinion. A related method is also provided.

Abstract: A method for lubricating an axle assembly can include: coupling a pair of tapered roller bearing to opposite ends of a differential housing; placing the differential housing into a carrier housing assembly such that the tapered roller bearings support the differential housing on the carrier housing assembly for rotation about a first axis; collecting a lubricant proximate a side of one of the tapered roller bearings opposite the differential housing; and rotating the differential housing about the first axis to cause the one of the tapered roller bearings to move a portion of the collected lubricant through the differential housing. A related axle assembly is also provided.

Abstract: The invention relates to the mechanical adapter assembly of the transmission line for a motor vehicle. The mechanical adapter includes shafts rotatably guided by different bearings and couplings for driving said different shafts. The mechanical adapter also includes a differential carrier, which is used in the form of a crankcase containing the oil for lubricating the different bearings and couplings and provided with a front aperture. A front plate integrates a pump and makes it possible to close said front aperture of the differential support. Additionally, an attached pipe section supplies the oil from said front plate to the differential support and interacts with additional fixtures to the front plate and the differential carrier.

Abstract: An axle assembly with an axle shaft, an annular disc and a pair of change members. The axle shaft includes an unthreaded body portion having a first diameter. The annular disc is mounted on the body portion and has a central aperture through which the unthreaded body portion is received. The central aperture has a second diameter that is larger than the first diameter. Rotation of the axle shaft causes the annular disc to translate on the unthreaded body portion between the change members and wherein a direction in which the annular disc translates is changed through contact between the annular disc and the change members.

Abstract: A carrier assembly includes an auxiliary lubrication pump that lubricates gear components positioned within an internal cavity of a carrier housing. A differential gear assembly is positioned within the internal cavity to rotate about an axis. The auxiliary lubrication pump includes a first gear that is driven by the differential gear assembly about the axis and a second gear that is driven by the first gear. The first and second gears of the auxiliary lubrication pump cooperate to direct and control lubrication with the carrier housing.

Abstract: An automatic transmission includes: a differential mechanism which includes a ring gear; a case which forms a differential chamber that houses the differential mechanism; and an oil pan which is fitted to the case, and which stores oil. The differential chamber includes a first space in which the oil supplied from the oil pan is gathered, and a second space which is formed on the opposite side of the first space with respect to the ring gear in the direction in which the rotational axis of the ring gear extends, and which is communicated with a space inside the oil pan. An oil passage, through which the oil is introduced from the first space to the second space, is formed in the case. The oil passage is formed in a bottom portion of the differential chamber.

Abstract: A device for optimizing the oil delivery function of the ring gear of a differential to maximize the volume of oil flow. The device includes an annular disk (6) which, when viewed in an axially direction, is arranged adjacent the ring gear (1) on the side of the ring gear (1) facing the differential cage (5) and is coaxial with the ring gear (1). The annular disk (6) also serves as a scraper ring.

Abstract: The invention provides a differential gear which can effectively prevent a drag noise of a clutch plate by a simple structure. In a differential gear (10) provided with a clutch means (16) having an inner pawl clutch plate (12) integrally rotating with a side gear (11), and an outer pawl clutch plate (14) integrally rotating with a differential case (13), a main communication path (41) and a radial communication path (44) communicating a bottom of the side gear (11) with a fitted portion (17) between the side gear (11) and the clutch plates (12, 14) is formed in the side gear (11), as a lubricating oil supplying means (40) for supplying a lubricating oil within the differential case (13) to a portion between sliding surfaces of both the clutch plates (12, 14) from the fitted portion (17) between the side gear (11) and the clutch plates (12, 14).

Abstract: An axle assembly for a vehicle includes a housing, a differential assembly rotatably supported within the housing, a differential cover and a gasket assembly positioned between the housing and the differential cover. The gasket assembly includes a body and a magnet coupled to the body. The magnet is positioned in communication with a lubricant located within the interior of the housing.

Abstract: A differential pinion gear has a curved interior surface, defining a hole for a pinion shaft to be disposed therein. The hole is narrower at the center and wider at the ends. The interior surface may have a radius of curvature at the center of the hole that is larger than the radius of curvature at each of the ends of the hole. The hole may also include a chamfered portion at each end.

Abstract: A power transmission apparatus is capable of easily passing lubricant toward a seal arranged between a higher shat and an opening of a case of the apparatus. The apparatus includes the higher shaft, i.e., a hollow connecting shaft that faces the outside of the transfer case through the opening of the transfer case. The oil seal is arranged between the hollow shaft and the opening of the transfer case. The hollow shaft meshes, through helical spur gears, with an intermediate transferring shaft that is positioned lower than the hollow shaft.

Abstract: An axle assembly that includes a housing assembly, a lubricant and a differential assembly. The housing assembly defines a differential cavity with a lubricant sump into which the liquid lubricant is received. The differential assembly is mounted in the differential cavity for rotation about a rotational axis and includes a differential case, a ring gear, a gear set and an oil shield. The differential case has a body, which defines a gear cavity into which the gear set is received, and a flange that is coupled to the body and includes a flange face. The ring gear is coupled to the flange. The oil shield is coupled for rotation to the differential case and covers a least a radially outward portion of the circumferentially discontinuous features so that they do not directly contact the liquid lubricant in the lubricant sump when the differential assembly rotates about the rotational axis.

Abstract: A limited slip differential transmission of the closed type in which a pressurized lubricant is fed to the rotating gears and a series of limited slip clutch plates. The clutch plates are engaged by pressurized control fluid. A valve assembly having a spool valve is responsive to engagement pressure to permit discharge of a portion of pressurized fluid from the clutch plates to a sump chamber and the transmission to purge debris that may have accumulated in the clutch plates. The spool valve is arranged so that fluid is passed only during an intermediate movement of the valve to minimize any pressure loss from the lubricating fluid for the transmission and limited slip clutches.

Abstract: Disclosed is a transmission, which makes it possible to conduct work of repairing or replacing a braking device by disassembling only parts of a reduction gear system after separating a housing, and in which oil is provided around the braking device and circulates along a flow path, thus preventing the braking device from wearing, thereby extending the lifetime of bearings and gears. The housing is separable at a point between a driven gear and a planetary gear assembly.

Abstract: A vehicle power transmission device mounted on a vehicle for transmitting power from a power generating source to an axle through a gear train accommodated in a case, including: a lubricating pump that is driven by the power generating source and is capable of supplying a lubricating medium to an element to be lubricated; a lubricating medium storage portion that stores the lubricating medium; a lowermost gear that is located at a lowest position in the case; a topmost gear that is located at a highest position in the case; a lubrication flow path that guides the lubricating medium scooped up by the lowermost gear and carried by the gear train to a predetermined element to be lubricated; and a guide portion that guides the lubricating medium scooped up by the lowermost gear and carried by the gear train to an inlet of the lubrication flow path.

Abstract: A differential gear set includes a pinion gear that at least a groove having a inner planar surface, at least a gear is formed in an exterior circumference thereof and at least a pinion shaft in which an end portion is inserted into the groove such that an end surface faces the inner surface of the groove and a planar portion is formed by cutting off in one side of an exterior circumference thereof corresponding to the interior circumference of the groove.

Abstract: A differential gear unit for motor vehicles comprises a housing and, therein, a differential gear mechanism, two coaxial gear mechanisms and two controllable friction clutches, the coaxial gear mechanisms transmitting an additional torque to one or other axle shaft according to the degree of engagement of the friction clutches. In order for it also to be possible for very high forces to be absorbed in long-term operation with very low installation space and wear, the coaxial gear mechanisms have in each case one internal gear which is connected fixedly in terms of rotation to one side of the associated friction clutch, and one sun gear which is connected fixedly in terms of rotation to the respective output element, and the second element of each coaxial gear mechanism is a sun gear, and a third element is configured as an annular gear which has an external toothing system which meshes with the first element and an internal toothing system which meshes with the second element.

Abstract: A miniaturized vehicular drive apparatus is provided with a reduced size in an axial direction without increasing the number of parallel shafts. A first electric motor M1 and a power distributing mechanism (differential portion) 16 are disposed on a first axis CL1, forming a rotational axis of an input rotary member 14, in series starting therefrom and an automatic transmission (transmission portion) 20 is disposed on a second axis CL2 parallel to the first axis CL1. A drive linkage 23 is provided between a power transmitting member 18, acting as a rotary member placed on the first axis CL1 at an end portion thereof in opposition to the input rotary member 14, i.e., in opposition to an engine 8, and a first intermediate shaft (rotary member) 40, disposed on the second axis CL2 at an end portion thereof in opposition to the input rotary member 14, for power transmitting capability. Thus, a power transmitting path is formed in a C-shape, i.e.

Abstract: The large diameter cage has an asymmetric shape, a diameter (discharge diameter) of which close to an opening is larger than a diameter (inflow diameter) close to the small diameter cage, and the small diameter cage has a symmetric shape, in which a diameter (inflow diameter) of which close to an opening is equal to a diameter (discharge diameter) close to the large diameter cage.

Abstract: A method for lubricating an axle assembly can include: coupling a pair of bearing to opposite ends of a differential housing; placing the differential housing into a carrier housing assembly such that the bearings support the differential housing on the carrier housing assembly for rotation about a first axis; collecting a lubricant proximate a side of one of the bearings opposite the differential housing; and rotating the differential housing about the first axis to cause the one of the bearings to move a portion of the collected lubricant through the differential housing. A related axle assembly is also provided.

Abstract: A rotary-shaft support device including a casing having an inner circumferential surface defining a shaft hole in which an output shaft is rotatably fitted, the inner circumferential surface having a generally helical lubrication groove having a non-helical inlet end portion which is formed in an open end portion of said shaft hole and which is parallel to a plane perpendicular to an axis of said shaft hole.

Abstract: A differential for a wheeled motor vehicle comprises a differential gear unit, and a differential case for housing therein the differential gear unit. The differential case is rotatable about its rotation axis in normal and reverse directions at a position above an oil level of a lubricating oil. The differential case includes a portion having an oil inlet opening formed therethrough, the oil inlet opening communicating the interior of the differential case with the outside of the same; and an oil dipping up structure that dips up the lubricating oil to force the same to enter the interior of the differential case through the oil inlet opening when the differential case rotates about the rotation axis.

Abstract: An axle assembly including a differential gear set having a ring gear. The axle assembly includes a carrier assembly housing that contains the differential gear set and an arcuate fence disposed adjacent to the ring gear that connects to the carrier assembly housing. A moveable plate slidingly connects to the arcuate fence. The moveable plate has an open position, a closed position and a plurality of positions therebetween. The closed position is closer to the ring gear than the open position. The arcuate fence and/or the moveable plate may reduce churning of the lubrication to increase the cooling efficacy of the lubrication.

Abstract: A planetary gear unit includes a sun gear supported for rotation about an axis and including gear teeth, and a pinion supported for rotation, including pinion teeth engaged with the sun gear teeth and formed with a first passage located between consecutive teeth of the pinion and directed radially toward the engagement of the sun gear and the pinion.

Abstract: A plurality of microscopic grooves are created on the surface of the teeth of planetary gears, and thus, irregular unevenness is created. This irregular unevenness includes a plurality of first microscopic grooves which function as lubricant grooves and a plurality of second microscopic grooves which are shallower than the first microscopic grooves.

Abstract: A two-speed segmented transfer case includes an automatic transmission side, and a transfer case side. The transfer case side having a gear reduction set, and a shift sleeve for selecting between the high, or direct drive speed, and the low, or reduced gear speed. The transmission side includes a hydraulic clutch which is used to transfer power from the transmission, to the front wheels. The hydraulic clutch is operated and controlled by the use of automatic transmission fluid that comes from the vehicle transmission. When fully engaged, the hydraulic clutch causes the power coming into the transfer case to be split between the front and rear wheels. This configuration allows for the elimination of a separate actuation system that would normally control the engagement of the clutch.

Abstract: A vehicle planetary gear device includes a ring gear, a sun gear, and a carrier, and pinions housed in the carrier. A penetration hole formed in a hollow cylindrical portion of the carrier has two inner wall surfaces that face an outer peripheral surface of a pinion. One of the inner wall surfaces has a curvature radius larger than the radius of the pinion, and has a curvature center that is apart from the radius center of the pinion gear. The pinion is disposed with respect to the carrier with a predetermined space formed between the one of the inner wall surfaces and the outer peripheral surface of the pinion, and thereby slides along a radial direction of the carrier.

Abstract: In an off-highway vehicle having an electric propulsion system which includes a motorized wheel, a traction motor and a transmission for transmitting power from the traction motor to the motorized wheel, wherein the transmission comprises a reduction stage, a low speed sun pinion defining a sun pinion cavity and a thrust washer, wherein the thrust washer includes a first surface portion movably associated with the low speed sun pinion via a thrust washer retainer and wherein the thrust washer is movably associated with the reduction stage via a lubrication plug is provided, wherein the lubrication plug includes a first plug portion having a radially extending portion movably associated with a second surface portion of the thrust washer and a second plug portion having a second plug portion structure which defines a plug cavity having a plug cavity inlet and at least one plug cavity outlet disposed adjacent at least a portion of the thrust washer, wherein the plug cavity inlet is disposed to communicate the su

Abstract: A vehicular drive system including a first electric motor, a differential mechanism operable to distribute an output of a drive power source to the first electric motor and a power transmitting member, a second electric motor disposed in a power transmitting path between the power transmitting member and a drive wheel, and a power transmitting device disposed between the second electric motor and the drive wheel, wherein the first electric motor, the differential mechanism, the second electric motor and the power transmitting device are arranged in an axial direction of the vehicular drive system, the vehicular drive system being characterized by a support wall disposed between the second electric motor and the power transmitting device and arranged to support the second electric motor, and a first group of oil passages which are formed through the support wall and through which a lubricating oil is supplied to at least one of the first electric motor, the differential mechanism and the second electric motor,

Abstract: Apparatus for transmitting torque in a vehicular differential assembly includes a ring gear surrounding a first axis about which the housing rotates; and a differential housing secured to the ring gear, including a wall surrounding the first axis and formed with a port spaced mutually about the first axis and extending through a thickness of the wall, a periphery of the port being a oval defined by first and second opposed straight edge portions, each straight edge portion located on an opposite side of a second axis, and an arcuate corner portion located at each end of each straight edge portion, the second axis being inclined with respect to the first axis in an angular range from 20 degrees to 50 degrees.

Abstract: A vehicle differential case is disclosed, the case having an interior and an exterior configuration which provides an increased internal volume for, among other things, lubricant for components of the differential mechanism, while at the same time providing excellent structural strength. Importantly, the weight versus stiffness ratio of the differential case so described is significantly improved compared to known differential cases.

Abstract: A differential gear 1 for a vehicle comprises a differential case 2 having a pair of holes 9R, 9L for drive shafts, a pair of pinion gears 3, 4 supported by pinion gear supporters 10, 11 and a pair of side gears 5R, 5L engaging with the pinion gears 3, 4. A pair of thrust washers 6R, 6L is interposed between the backs of the side gears 5R, 5L and the inner peripheries of the holes 9R, 9L without radial movement.

Abstract: A power transmission device is provided with a gear mechanism, a case, an oil pump and an oil tank. The gear mechanism is arranged to operate in coordination with a drive source. The case houses the gear mechanism and stores oil for lubricating the gear mechanism. The oil pump is arranged to operate in coordination with the drive source so as to pump the oil stored in the case to lubricate the gear mechanism. The oil tank is arranged to collect a portion of the oil pumped from the oil pump. The oil tank includes a first discharge outlet arranged to discharge the oil collected in the oil tank to the case and a second discharge outlet arranged to discharge collected oil to the case when an amount of the oil collected in the oil tank is equal to or larger than a prescribed amount.

Abstract: A partition structure of a power train device is provided with: a second differential coupled with an external first differential so as to receive a driving force input to the first differential; a case having a first end facing to the first differential, a second end opposed to the first end and a wall defining the case, the case rotatably housing the second differential and an oil for lubrication of the second differential; and a seal member disposed at the first end of the case and between the first differential and the second differential so as to prevent the oil in the case from mixing with an external fluid existing outside with respect to the case and the seal member.

Abstract: In a lubrication groove, which is formed in an insertion hole into which is inserted an output shaft, and which winds around the circumference of the insertion hole while advancing in the axial direction of the insertion hole, there is a portion that is farther to the outside than a perpendicular plane that is perpendicular to a center plane of a differential case on which lie the axial centers of the insertion hole and a pinion gear shaft, the perpendicular plane including a line of intersection of the center plane and the insertion hole. That portion is a perpendicular groove portion which is parallel to a plane that is perpendicular to the axial center of the insertion hole. Accordingly, when extracting a core for forming the insertion hole and the lubrication groove from a die, projections formed on the core for forming the lubrication groove will not interfere with the die. As a result, it is possible to form the lubrication groove during casting of the differential case using that core.

Abstract: A differential mechanism 3 is contained and supported at inside of a bell housing 7 integrally provided to a transmission case 11 of a transmission 9 to constitute a common lubrication environment. A limited slip differential mechanism 5 for limiting differential movement of the differential mechanism 3 is made to be selectively attachable to outside of the bell housing 7. The limited slip differential mechanism 5 is not restricted by a size of the bell housing 7, the sufficient limited slip differential mechanism 5 can be provided, and an interchangeability of presence/absence of the limited slip differential mechanism 5 can be provided.

Abstract: A drive axle assembly is provided that improves lubrication of the bearing surfaces of the inter-axle differential gears, the side gears meshed with the differential gears, and the input and output shafts. Lubricant splashed from the ring gear is collected and is then distributed by a bearing supporting the output side gear for rotation within the housing for the assembly. The bearing directs lubricant to the differential gears where seals and/or close tolerances retain the lubricant an allow it to flow to the surfaces of the input shaft and the helical side gear disposed about the input shaft. The output side gear disposed about the output shaft may also include a passage allowing lubricant to flow through the gear to the bearing surfaces of the output shaft and output side gear.

Abstract: A differential lubrication system includes structure forming a torque converter feed passage in fluid communication with a fluid source and in which fluid is selectively supplied to a torque converter. Structure forming a branch passage for lubricating a differential mechanism extends from the torque converter feed passage to divert fluid to the differential mechanism prior to the fluid being supplied to the torque converter. Two flow restrictions and a valve mechanism may be employed to control lubrication of the differential mechanism. One of the flow restrictions may form a nozzle so that fluid is sprayed onto the differential mechanism. A method of lubricating the differential mechanism is also provided.

Abstract: A lubrication system of an axle assembly comprising a differential carrier rotatably supporting a differential case therewithin, an axle tube extending outwardly from the differential carrier, a bearing assembly for rotatably supporting the differential case within the differential carrier, and an annular drain-back baffle formed with a drain-back hole passing through the drain-back baffle and defining an oil delivery passage between the differential carrier and the axle tube. The drain-back baffle is selectively positioned within the axle assembly to provide changeable oil flow characteristics of the axle assembly. A method is provided for controlling flow of lubricant between a differential gear and an axle tube by selectively adjusting the position of the drain-back channel in order to provide the desired lubricant flow path.

Abstract: A coupling device (11) including a housing (13, 15) defining a clutch cavity (39) and at least one window (55, 57) extending through the housing adjacent the clutch cavity. A clutch assembly (29) is disposed within the clutch cavity and includes a first clutch disc (31) having ears (63) to limit rotation relative to the housing. The housing defines a plurality of fluid passages (67) extending axially from the window to the clutch cavity, the housing defining a plurality of axial recesses (61), each of which receives one of the ears of each disc. Each of the fluid passages (67) is in fluid communication with one of the axial recesses (61), and receives fluid as the window passes through a reservoir of fluid (F).

Abstract: An axle assembly including a differential gear set having a ring gear. The axle assembly includes a carrier assembly housing that contains the differential gear set and an arcuate fence disposed adjacent to the ring gear that connects to the carrier assembly housing. A moveable plate slidingly connects to the arcuate fence. The moveable plate has an open position, a closed position and a plurality of positions therebetween. The closed position is closer to the ring gear than the open position. The arcuate fence and/or the moveable plate may reduce churning of the lubrication to increase the cooling efficacy of the lubrication.

Abstract: An axle assembly includes an axle housing having a main body and defining an internal cavity. The axle housing includes a first and second opening defined in the main body and adapted to support a first and second differential bearing respectively. A differential assembly is supported in the axle housing with the first and second differential bearings. The main body defines an inner mounting surface, an outer face and an inner circumferential surface extending between the inner mounting surface and the outer face. The inner circumferential surface defines a third opening. The main body defines a relief formed through the inner mounting surface and extending through a portion of the inner circumferential surface. The relief defines a fluid communication path for delivering fluid to a pinion bearing assembly arranged in the third opening.

Abstract: An inter-axle differential gear assembly includes a first side gear driven by an input shaft, a plurality of inter-axle differential pinion gears in meshing engagement with the first side gear, and a second side gear in meshing engagement with the inter-axle differential pinion gears. The second side gear includes a gear body having a front face and a rear face positioned opposite of the front face. At least one channel, formed within the gear body, extends between the front and rear faces. Lubricating fluid is pumped through the channel to lubricate the inter-axle differential gear assembly. A tapered roller bearing is positioned adjacent the rear face of the second side gear. A seal, positioned between the tapered roller bearing and the rear face of the second side gear, forms a sealed fluid cavity. Rotation of the tapered roller bearing generates a pumping action that pumps the lubricating fluid through the tapered roller bearing, into the sealed fluid cavity, and into the channel.