Ntn Corporation

Kazuhiro Baba

Kazuo Komori

Takayuki Norimatsu

Toru Takahashi

Kentarou Nishikawa

Kazunori Kubota

Eiji Tajima

Akira Fujimura

Masahiro Kiuchi

Shinji Nishio

Shinji Morita

A vehicle wheel bearing apparatus has an outer member () formed with double row outer raceway surfaces () on its inner circumferential surface. Inner members () are each formed with double row inner raceway surfaces () on its outer circumferential surface arranged opposite to the double row outer raceway surfaces (). Double row ball groups () are freely rollably contained between the outer raceway surfaces () and inner raceway surfaces () of the inner members () and the outer member (). A pitch circle diameter (PCDo) of a ball group () near a wheel mounting flange () is larger than a pitch circle diameter (PCDi) of a ball group () away from the wheel mounting flange (). Each corner of the shoulders of the outer and inner raceway surfaces () is rounded as a smooth circular arc.

Bearing apparatus for a wheel of vehicle

A sensor equipped wheel support bearing assembly for supporting a vehicle wheel rotatably relative to a vehicle body, including an outer member; an inner member; a plurality of rows of rolling elements interposed between the outer and inner member; a strain sensor unit, made up of a strain generating member and a sensor element fitted to the strain generating member for detecting strains induced in the strain generating member, is fitted to one of the outer and inner members, that serves as a stationary member; and a covering member that covers at least the sensor element sealingly, provided on a mounting surface of the strain generating member of the strain sensor unit, on which the sensor element is mounted, the covering member being made of a resin which is over-molded or an elastomer bonded by vulcanization.

Sensor-equipped bearing for wheel

To provide a sensor equipped wheel support bearing assembly, in which a load sensor can be installed compactly in an automotive vehicle, maintaining a high sensitivity while damage and/or malfunction caused by the external environments and/or the electromagnetic noises are avoided, with low manufacturing cost. This bearing assembly includes outer and inner members having respective rolling surfaces and a plurality of rows of rolling elements interposed between those rolling surfaces. A strain sensor unit including a sensor element is fitted to one of the outer and inner members, which is a stationary member, for example, the outer member. A sensor mounting surface of the strain sensor unit fitted with the sensor element has a covering member made of a resin, which is over-molded, or an elastomer bonded by vulcanization, so as to cover the sensor element sealingly.

A vehicle wheel bearing apparatus has a pitch circle diameter of an outer side ball group that is larger than a pitch circle diameter of an inner side ball group. Each corner portion of the outer circumferential surfaces of the inner member is rounded as a smooth circular arc.

A vehicle wheel bearing apparatus has an outer member with a body flange and double row outer raceway surfaces. An inner member includes a wheel hub and an inner ring. They include inner raceway surfaces arranged opposite to the double row outer raceway surfaces. Double row rolling elements are freely rollably contained between the outer and inner raceway surfaces. Outer side rolling elements of the double row rolling elements are balls and inner side rolling elements of the double row rolling elements are tapered rollers. A pitch circle diameter of the inner side tapered rollers is set smaller than that of the outer side balls. A substantially conical recess is formed at an outer side end portion of the wheel hub. The depth of the recess extends to at least near the bottom of the inner raceway surface of the wheel hub. The thickness of a portion of the wheel hub where the inner raceway surface is formed is set within a predetermined range. The outer side wall of the wheel hub has a constant thickness substantially along the inner surface of the recess.

A vehicle wheel bearing apparatus has an outer member and inner member. The inner member includes a wheel hub and inner ring. The outer member and inner member include respective raceway surfaces. Double row rolling elements are freely rollably contained between the outer and inner raceway surfaces, respectively, of the outer member and the inner member. At least the inner side rolling elements of the double row rolling elements are tapered rollers. A pitch circle diameter of the inner side rolling elements is set smaller than a pitch circle diameter of the outer side rolling elements. A substantially conical recess is formed at an outer side end portion of the wheel hub. The depth of the recess extends near to a shaft shaped portion beyond the bottom of the inner raceway surface of the wheel hub. The thickness of a portion of the wheel hub where the inner raceway surface is formed is set within a predetermined range. The outer side wall of the wheel hub is formed to have a substantially constant thickness along the inner surface of the recess.

A sealing device designed to minimize accumulation of a fluid medium trapped therein to thereby increase a sealing performance and adapted to seal a space between inner and outer peripheral members rotatable relative to each other. The sealing device includes a generally L-sectioned annular sealing plate fitted to one of the inner and outer peripheral members and a generally L-sectioned annular sealing element fitted to the other of the inner and outer peripheral members so as to confront the sealing plate. The sealing plate has a radial wall and a tilted wall extending from the radial wall so as to incline inwardly thereof, and the sealing element includes a generally L-sectioned base plate provided with an elastic member. The elastic member has a side lip slidably engageable with the radial wall of the sealing plate and a radial lip slidingly engageable with a cylindrical sleeve of the sealing plate.

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Iwata, Japan

Kazuhiro Baba