Abstract: An input gear, an output gear, an input-side intermediate gear, and an output-side intermediate gear are helical gears. The output gear and the output-side intermediate gear have a larger module than the input gear and the input-side intermediate gear. The input gear and the input-side intermediate gear have a larger twisting angle than the output gear and the output-side intermediate gear. The output gear and the output-side intermediate gear have a larger effective tooth length than the input gear and the input-side intermediate gear.

Abstract: A vehicle drive device uses a parallel shaft gear reducer (30) in which a gear is composed of helical gear, as a speed reducer part (B) that decelerates and outputs a rotation of an electric motor part (A). In the vehicle drive device, of meshing parts of the gears formed in the speed reducer part (B), two gears form a meshing part in which the amount of misalignment that occurs between the tooth surfaces of the two gears meshing with each other is different during driving and during coasting of a vehicle. A first tooth surface (S1) meshing with a mating tooth surface during driving is subjected to tooth surface modification, and a second tooth surface (S2) meshing with a mating tooth surface during coasting is subjected to tooth surface modification of an amount different from an amount of the tooth surface modification to the first tooth surface (S1).

Abstract: The input gear 30, the output gear 35, the input-side intermediate gear 31, and the output-side intermediate gear 32 are helical gears. The output gear 35 and the output-side intermediate gear 32 have a larger module than the input gear 30 and the input-side intermediate gear 31. The input gear 30 and the input-side intermediate gear 31 have a larger twisting angle than the output gear 35 and the output-side intermediate gear 32. The output gear 35 and the output-side intermediate gear 32 have a larger effective tooth length than the input gear 30 and the input-side intermediate gear 31.

Abstract: A vehicle drive device uses a parallel shaft gear reducer (30) in which a gear is composed of helical gear, as a speed reducer part (B) that decelerates and outputs a rotation of an electric motor part (A). In the vehicle drive device, of meshing parts of the gears formed in the speed reducer part (B), two gears form a meshing part in which the amount of misalignment that occurs between the tooth surfaces of the two gears meshing with each other is different during driving and during coasting of a vehicle. A first tooth surface (S1) meshing with a mating tooth surface during driving is subjected to tooth surface modification, and a second tooth surface (S2) meshing with a mating tooth surface during coasting is subjected to tooth surface modification of an amount different from an amount of the tooth surface modification to the first tooth surface (S1).

Abstract: An object of the present invention is to decrease the size of a torque difference amplification mechanism to decrease the size and weight of a vehicle driving wheel apparatus which includes the torque difference amplification mechanism. The invention includes a gear unit 30, which is provided between electric motors (2L, 2R) each having an outer rotor (5) and left and right driving wheels and is constituted by two planetary gear mechanisms (3L, 3R) each having three elements and two degrees of freedom assembled coaxially with each other. The planetary gear mechanisms include: input outer gears (RL, RR) coupled to the outer rotors (5) of the electric motors (2L, 2R); output planetary carriers (CL, CR) coaxial with the outer gears (RL, RR); sun gears SL, SR which are coaxial with the outer gears (RL, RR); and planetary gears PL, PR serving as revolution gears.

Abstract: Helical gears in gear trains of speed reducers generate thrust forces in directions not to separate a speed reducer casing which has an axial three-piece structure, whereby leakage of lubricant oil from between separated surfaces in the speed reducer casing is prevented. Output gear which generates large thrust force on the final stage in each gear train of the speed reducers both generated inward forces, so that the center casing does not receive forces in directions in which the left and the right casings is separated therefrom.

Abstract: Helical gears in gear trains of speed reducers 2L, 2R generate thrust forces in directions not to separate a speed reducer casing 20 which has an axial three-piece structure, whereby leakage of lubricant oil from between separated surfaces in the speed reducer casing 20 is prevented. Output gears 25L, 25R which generates large thrust force on the final stage in each gear train of the speed reducers 2L, 2R both generates inward forces, so that the center casing 20a does not receive forces in directions in which the left and the right casings 20bL, 20bR is separated therefrom.

Abstract: A two-motor vehicle-driving apparatus is provided where the size of speed reducers in a radial direction is small. A motor shaft of the electric motor has an axial-through hollow structure. The motor shaft is provided with an input gear integrally therewith at its end closer to the speed reducer, with an output shaft provided inside the hollow motor shaft coaxially therewith. The output shaft has an output gear integrally therewith at its end closer to the speed reducer. The speed reducer is provided with one or more intermediate shafts rotatably in parallel with the motor shaft and the output shaft. The intermediate shaft is provided with a plurality of gears integrally therewith for engagement with the input gear of the motor shaft and with the output gear of the output shaft to transmit rotation of the motor shaft to the output shaft at a reduced speed.

Abstract: An in-wheel motor drive device includes a motor part, a speed reducer part, a wheel bearing part, a casing, and a lubrication mechanism configured to supply lubricating oil to the motor and speed reducer parts. A rotation shaft of a motor in the motor part is configured to drive an input shaft of a speed reducer having eccentric portions to rotate. The speed reducer part reduces a speed of rotation of the input shaft of the speed reducer and transmits the rotation to an output shaft of the speed reducer. The wheel bearing part is connected to the output shaft of the speed reducer. The motor part includes a stator fixed to the casing and a rotor arranged at the rotation shaft of the motor. A shielding plate that reduces stirring resistance of the lubricating oil generated by rotation of the rotor is arranged in the motor part.

Abstract: An in-wheel motor drive device includes a motor part, a speed reducer part, a wheel bearing part, a casing, and a lubrication mechanism that supplies lubricating oil to the motor and speed reducer parts. A rotation shaft of a motor in the motor part drives an input shaft of a speed reducer. The speed reducer part reduces a rotation speed of the input shaft and transmits the rotation to an output shaft. The lubrication mechanism includes an oil path in the speed reducer part, which discharges oil inside the speed reducer part to the motor part, and an oil path in the motor part, which discharges oil inside the motor part to an oil tank together with the oil from the speed reducer part. The motor part includes a partition plate that guides the oil from the speed reducer part to the oil path in the motor part.

Abstract: An in-wheel motor driving device includes a wheel braking device. A back plate of a drum brake or a mounting member for calipers of a disc brake constituting the wheel braking device is formed integrally with an outboard-side end member which is fastened to a outboard-side end surface of a housing of a speed reducer section.

Abstract: An in-wheel motor driving device in which a motor section A and a wheel hub bearing section C are connected coaxially in series via a speed reducer section B, whereby an axial dimension of the in-wheel motor driving device is reduced to provide a large inside space of a vehicle as well as an increase in freedom of routing a power supply wires. A terminal box for the power supply wires which supply power to the motor section A is disposed on the outer circumferential side surface of the housing which holds the motor section A. The power supply wires are routed out of the terminal box to an inboard side and are anchored by a power supply wire holder which extends perpendicularly to an axial centerline of the housing.

Abstract: In a configuration where a left and a right wheels are driven individually by a plurality of drive-motor units mounted on a vehicle body, power transmission members which are provided by constant-velocity joints have a small operation angle made by their input shafts and output shafts for improved life of the constant-velocity joints. Left and right wheels are individually driven by a plurality of drive-motor units, which are mounted onto a vehicle body via a sub-frame, so that each power transmission member provided by a constant-velocity joint has a small operation angle made by its input shaft and output shaft.

Abstract: An in wheel motor driving device which has a deceased axial dimension and includes aluminum alloy housings having a minimum wall thickness for reduced weight while retaining good assemblability. An in-wheel motor driving device includes: a motor section which has an output shaft; a wheel hub bearing section C; and a speed reducer section which connects the output shaft of the motor section and the wheel hub bearing section coaxially with each other. A housing outer circumferential portion of the motor section and a housing outer circumferential portion of the speed reducer section are integral with each other, being provided by one, outer circumferential member. An outboard-side end member is fixed to an outboard-side end of the outer circumferential member by means of bolts, and the wheel hub bearing section has its fixing ring fixed to the outboard-side end member.

Abstract: An object of the present invention is to reduce an axial dimension of an in-wheel motor driving device in which a motor section A and a wheel hub bearing section C are connected coaxially in series via a speed reducer section B, thereby providing a large inside space of a vehicle as well as increasing freedom of routing a power supply wires. A terminal box for the power supply wires which supply power to the motor section A is disposed on the outer circumferential side surface of the housing which holds the motor section A. The power supply wires 61 are routed out of the terminal box to an inboard side and are anchored by an power supply wire holder which extends perpendicularly to an axial centerline of the housing.

Abstract: A power line (51) provided to a vehicle that drives a wheel assembly (21) by a motor (12) and connected to the motor (12) so as to be exposed outside the vehicle body (41) is covered with a protective member (52) which has mesh-type ventilating opening.

Abstract: An in wheel motor driving device which has a deceased axial dimension and includes aluminum alloy housings having a minimum wall thickness for reduced weight while retaining good assemblability. An in-wheel motor driving device includes: a motor section which has an output shaft; a wheel hub bearing section C; and a speed reducer section which connects the output shaft of the motor section and the wheel hub bearing section coaxially with each other. A housing outer circumferential portion of the motor section and a housing outer circumferential portion of the speed reducer section are integral with each other, being provided by one, outer circumferential member. An outboard-side end member is fixed to an outboard-side end of the outer circumferential member by means of bolts, and the wheel hub bearing section has its fixing ring fixed to the outboard-side end member.

Abstract: An object of the present invention is to provide an in-wheel motor driving device which has a deceased axial dimension and includes aluminum alloy housings having a minimum wall thickness for reduced weight while retaining good assemblability. An in-wheel motor driving device includes a wheel braking device. A back plate of a drum brake or a mounting member for calipers of a disc brake constituting the wheel braking device is formed integrally with an outboard-side end member which is fastened to a outboard-side end surface of a housing of a speed reducer section, for reduced number of parts and minimal axial dimension.

Abstract: An object of the present invention is to reduce an axial dimension of an in-wheel motor driving device in which a motor section A and a wheel hub bearing section C are connected coaxially in series via a speed reducer section B, thereby providing a large inside space of a vehicle as well as increasing freedom of routing a power supply wires. A terminal box for the power supply wires which supply power to the motor section A is disposed on the outer circumferential side surface of the housing which holds the motor section A. The power supply wires are routed out of the terminal box to an inboard side and are anchored by a power supply wire holder which extends perpendicularly to an axial centerline of the housing.