Ntn Corporation

Kazuhiro Muramatsu

Kazuhiko Yoshida

Minoru Ishijima

Manabu Hoshino

Hiroshi Teduka

Hisaaki Kura

Katsuyuki Ikei

Akira Wakita

Hiroaki Makino

Yoshimasa Ushioda

Hiroki Ooe

A driving-wheel bearing device includes an outer race having double-row outer raceway surfaces formed on an inner periphery thereof, a hub wheel and an inner race having a wheel attachment flange at one end thereof and double-row inner raceway surfaces on an outer periphery thereof, and double-row rolling elements interposed between the outer raceway surfaces of the outer race and the inner raceway surfaces of the hub wheel and the inner race, the hub wheel having a shaft hole into which a stem section extending from an outer joint member of a constant velocity universal joint is spline-fitted by being press-fitted, in which a plate having a molybdenum coating layer or a fluorine-resin coating layer formed thereon and having a plate thickness ranging from 0.5 mm to 2 mm is interposed between opposite surfaces of a shoulder portion of the outer joint member and an crimped portion of the hub wheel.

Bearing device for driving wheel

A steel ball rolling configuration and a constant velocity universal joint have a superior oil retention effect between a surface of a steel ball and a partner rolling surface, and can form a thick oil film, improve lubrication, and extend life of the steel ball. The constant velocity universal joint includes a rolling surface and a steel ball that is lubricated by grease and rolls over the rolling surface. A surface roughness of the steel ball is roughened to become more similar to a surface roughness of a partner rolling surface. Numerous miniscule recesses roughly tens of micrometers in size are randomly disposed on the surface of the steel ball.

Steel ball rolling configuration and constant velocity universal joint

A constant velocity universal joint which can provide an improved strength in a stem portion by simple and effective countermeasure. The constant velocity universal joint include a bowl-shaped mouth portion and an outer joint member having the stem portion with a serration formed on its outer peripheral surface. The stem portion extends from a bottom portion of the mouth portion in its axial direction as an integrated part. An induction hardened area C is formed in the bottom portion of the mouth portion.

Constant velocity universal joint and wheel bearing device using the same

A shaft member and an outer peripheral member disposed on the outer periphery of the shaft member are joined together by splines through which the teeth of the shaft member and the teeth of the outer peripheral member are fitted together. At one axial end of each spline a trough in the tooth of the shaft member is diametrically increased to provide a diametrically increased region S In this diametrically increased region S , there is defined a fit region F for the tooth of the shaft member and the tooth of the outer peripheral member

Power transmission mechanism

Growing community of inventors

Iwata, Japan

Kazuhiro Muramatsu