Ntn Corporation

Masaru Kuroda

Kenichi Suzuki

Akihiko Katayama

Tomohisa Uozumi

Katsufumi Abe

Hisataka Hasegawa

Haruki Yamada

Naoyuki Uchiyama

The wheel drive motor according to the invention includes a motor shaft () having a large diameter portion () located at a central part in the axial direction and a small diameter portion () located on a first side in the axial direction, a bearing () rotatably supporting the small diameter portion (), and a rotor () secured to an outer circumferential surface () of the large diameter portion (). An end part () of the rotor () located on the first side in the axial direction projects over an end face () of the large diameter portion () located on the first side in the axial direction toward the side on which the small diameter portion () is.

Wheel drive motor and in-wheel motor drive assembly

An in-wheel motor drive device includes: a motor part; a speed reduction part; a wheel bearing part; and a casing, the motor part including: a stator, which is fixed to the casing; a rotation shaft of a motor, which is rotatably supported on the casing through intermediation of a plurality of rolling bearings; and a rotor, which is mounted to the rotation shaft of the motor, the rotation shaft of the motor being configured to rotationally drive an input shaft of a speed reducer, the speed reduction part being configured to reduce a speed of rotation of the input shaft of the speed reducer to transmit the rotation to an output shaft of the speed reducer, the wheel bearing part being connected to the output shaft of the speed reducer, the rotation shaft of the motor being made of case hardening steel and subjected to carburizing, quenching, and tempering.

In-wheel motor drive device

Provided is an in-wheel motor drive device, including a casing configured to hold a motor part, a speed reduction part, and a wheel bearing part, the motor part including; a stator, which is fixed to the casing; a rotation shaft of a motor, which is rotatably supported on the casing through intermediation of rolling bearings; and a rotor, which is mounted to the rotation shaft of the motor. The rolling bearing has a radial internal clearance of from 8 &#x3bc;m to 25 &#x3bc;m before being mounted into the motor part. The rotation shaft of the motor is rotatably supported on the casing through intermediation of a plurality of rolling bearings. The rotation shaft of the motor and the rolling bearings configured to support the rotation shaft of the motor are fitted to each other by transition fit or interference fit.

A cam follower for a rocker arm includes a cylindrical outer ring () having an outer circumference surface abutting on a cam, a support shaft () to support the outer ring (), a plurality of rollers () arranged in an annular region between the support shaft () and the outer ring (), and a side plate () composed of a ring-shaped disk penetrated by the support shaft (), opposed to an end face () of the roller (), and having an outer diameter Ds smaller than an inner diameter Dr of the outer ring (). The side plate () is arranged at each end of the roller (), and a relationship Lr&#x3c;Lk+2t is satisfied in which Lk represents a shaft length of the roller (), Lr represents a shaft length of the outer ring (), and t represents a thickness of the side plate ().

Cam follower for rocker arm and cam follower device

A rocking bearing outer ring () includes an arcuate track member () having a track surface on its inner diameter surface, and a flange portion () projecting radially inward from each widthwise end portion of the track member (). In addition, when it is assumed that Lrepresents a circumferential length of the track member () and Lrepresents a circumferential length of the flange portion (), 0.2&#x2266;L/L&#x2266;8 is satisfied.

Growing community of inventors

Shizuoka, Japan

Masaru Kuroda