Ntn Corporation

Ryou Yukishima

Minoru Suzuki

Ken Yamamoto

Katsunori Sato

Tetsuya Yamamoto

Tomoaki Makino

Isao Hirai

Hidenori Karasawa

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.

In-wheel motor drive device

A vehicle drive device uses a parallel shaft gear reducer () 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 (S) meshing with a mating tooth surface during driving is subjected to tooth surface modification, and a second tooth surface (S) 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 (S).

Vehicle drive device

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.

Two-motor vehicle drive device

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.

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.

In-wheel motor-driven device

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.

Growing community of inventors

Iwata, Japan

Ryou Yukishima