Ntn Corporation

Natsuko Nagai

Shigeaki Fukushima

Yuta Nakatsuji

Hisashi Ohtsuki

Provided is a bearing device for a vehicle wheel that is suitable in being able to prevent impairment in assemblability of the bearing device for a vehicle wheel to a knuckle without cost increase. A bearing device for a vehicle wheel () is provided with an inner member and an outer ring () which is an outer member having a vehicle-body-mounting flange part (), wherein the outer ring () has a pilot part () disposed inward of the vehicle-body-mounting flange part (), and the pilot part () has a fitting portion () configured to be fitted to a knuckle () and a guiding portion () having a diameter which gradually decreases inward from the inner-side end of the fitting portion ().

Bearing device for vehicle wheel

A manufacturing method of a bearing device for a vehicle wheel () includes: a pressure adjusting step of enclosing, in a work chamber (Rw), the bearing device for a vehicle wheel () to which a sealing member () on an outer side is fitted in the work chamber (Rw), and adjusting a pressure in the work chamber (Rw) to a predetermined atmospheric pressure (Pt) according to an environment of a use area of the bearing device for a vehicle wheel (); and a sealing step of fitting a cover () that seals an inner side opening () of an outer ring () or an inner side sealing member () that seals between the outer ring () and a hub ring () or an inner ring () to the inner side opening () in the work chamber (Rw) in which a pressure has been adjusted.

Method for manufacturing bearing device for vehicle wheel

A bearing device for a wheel is configured such that: bolt insertion holes are provided in a vehicle body mounting flange of an outer member; knuckle bolts are inserted through the bolt insertion holes; bolt press-fitting holes are provided in a wheel mounting flange of a hub ring; and hub bolts are press-fitted in the bolt press-fitting holes. A dam section protruding radially outward is provided on an outer-side outer periphery of the outer member, and a cutout through which a tightening tool for tightening the knuckle bolts can be inserted through the bolt insertion holes is defined in the dam section.

Bearing device for wheel

A bearing device for a vehicle wheel () includes: an outer ring (), serving as an outer member; an inner member in which the inner member including a hub ring () that has an integral wheel mounting flange (B) to which a wheel is mounted, and at least one inner ring () that is press-fitted to a small-diameter step part (A) of the hub ring; ball rows () that are accommodated in a freely rolling manner; and a bottomed-tube-shaped cover () fitted to an inner-side opening (B) of the outer member. In order to retain grease enclosed between the outer member and the inner member near the ball rows, an outside damming member (D), which is formed of a ring-shaped elastic body extending radially inward, is provided at a side (A) of the cover.

A wheel bearing apparatus has a cylindrical pilot portion adapted to be fit into a knuckle. The pilot portion has a first guiding portion and a second guiding portion. A fitting width (A) of the first guiding portion with the knuckle is set larger than a fitting width (B) of the second guiding portion with the knuckle (A&#x3e;B). An outer diameter Dof the first guiding portion is set smaller than an outer diameter Dof the second guiding portion (D&#x3c;D). A seal ring, in elastic contact with the inner circumference of the knuckle, is arranged on either one of the first or second guiding portions.

Growing community of inventors

Iwata, Japan

Natsuko Nagai