Ntn Corporation

Yuta Nakatsuji

Natsuko Nagai

Akira Torii

Hiroto Suma

Hisanori Kobayashi

Xiaole Bao

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 devicefor a vehicle wheel, wherein an annular weir partis provided on the outer periphery of an outer-side end part of an outer member, the annular weir parthaving the rotation axis L of an inner memberas a center, the weir parthaving a shape that is asymmetrical between the upper side Us and the lower side Ls of the outer member, and the weir partbeing inclined farther toward the inner side the more a weir wall surfacefaces outward in the radial direction in a part or all of the upper side Us. Also, the weir partis inclined farther toward the outer side the more the weir wall surfacefaces outward in the radial direction in a part or all of the lower side Ls.

Bearing device for vehicle wheel

A wheel bearing device has a vehicle-body-mounting flangewith a plurality of earsdiscontinuously formed in a circumferential direction on an outer circumferential surface of the outer member. An outer circumferential surfaceon the outer side of the outer member is tapered and formed such that a diameter of the outer member gradually decreases in a direction to an outer side. Ridgesprotrude from a fitting surfacetoward the outside in a radial direction. The ridgesare formed between the plurality of ears. The ridgesare forged to smoothly connect to the outer circumferential surfaces of the plurality of ears. Ribsare forged on inner-side outer circumferential surfaces of the plurality of ears

Wheel bearing device

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.

The wheel bearing apparatus has hub bolts () to fasten a wheel secured equidistantly around the wheel mounting flange (). An annular groove () is formed on the outer-side surface () of the wheel mounting flange (). The annular groove () includes a region where the hub bolts () are mounted. The outer-side surface () of the wheel mounting flange () is formed as a cut surface cut after press-fitting of the hub bolts (). Weight reduction apertures (circular apertures) () are formed between the hub boltsof the wheel mounting flange (). A diameter of a circumscribed circle &#x3d5;A circumscribing the circular apertures () is set larger than an outer diameter &#x3d5;B of the annular groove (). Accordingly, muddy water is easily discharged from the circular apertures ().

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Iwata, Japan

Yuta Nakatsuji