Ntn Corporation

Takayuki Owada

Takayasu Takubo

Isamu Yoshida

Masahiro Nobutomo

Kazuo Komori

Akihiko Katayama

Masahiro Kiuchi

Kazunori Kubota

Yasuhiro Aritake

Koji Tateishi

Takuya Obata

A preload inspection method for a bearing device for a vehicle wheel comprises: a first bearing preload value calculation step for calculating a first bearing preload value; a first rotating torque measurement step for measuring a first rotating torque; a caulking step for swaging the small-diameter stepped part to the inner ring; a second bearing preload value calculation step for calculating a second bearing preload value; a second rotational torque measurement step for measuring a second rotational torque; a third bearing preload value calculation step for calculating a third bearing preload value by adding, to the first bearing preload value, a preload change amount based on a differential torque between the first rotating torque and the second rotating torque; and a determination step for determining the suitability of the preload from the second bearing preload value and the third bearing preload value.

Preload inspection method and assembly method for bearing device for vehicle wheel

A preload inspection method with which a preload value can be calculated more accurately. The preload inspection method for a wheel bearing device provided with an outer member having an outside raceway surface, an inner member having an inside raceway surface, and rolling bodies, is provided with: a power calculation step in which the outer member or the inner member is rotated in a relative manner and the power is calculated; a preload value calculation step in which a preload value is calculated on the basis of the power calculated in the power calculation step; and a pass/fail determination step is made on the basis of whether the preload value calculated in the preload value calculation step is within a permissible range.

Preload inspection method for bearing device for vehicle wheel

A vehicle wheel bearing apparatus has an outer member (), an inner member (), an inner ring (), and double row rolling elements () are freely rollably retained between double row outer raceway surfaces () and double row inner raceway surfaces (). An end face at the outboard side of the inner ring () is adapted to abut a stepped portion () formed on the wheel hub (). The inner ring () is secured on the wheel hub () by being sandwiched between a caulked portion () and the stepped portion (). A ratio (&#x3b1;) of the thickness (e), of an end () at the outboard side of the inner ring () to abut the stepped portion (), relative to the inner diameter (d) of the inner ring () is limited at or smaller than a predetermined value.

Bearing apparatus for a wheel of vehicle

An injection unit driving device or an mold-clamping unit driving device having a ball screw having a long life. Of the parts of the ball screw, only the balls are subjected to carburizing/nitriding treatment, while the threaded shaft and the nut are subjected to conventional hardening.

Driving device for injection molding machine

A plurality of balls,are disposed for rolling and circulation in a spiral calculation passage defined between a spiral screw groove surface,formed on the outer periphery of a screw shaft,and a spiral screw groove surface,formed on the inner periphery of a ball nut,. The opposite ends of the ball nut are each formed with a seal mounting portion,, in which a seal member,made of solid lubricating composition is mounted, sealing off the ball nut,. The ball nut,has lubricating grease G sealed therein.

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Shizuoka, Japan

Takayuki Owada