Ntn Corporation

Kiyotake Shibata

Isao Hirai

Kazunari Yamamoto

Toru Takahashi

Takayuki Norimatsu

Hiroshi Kawamura

Kazuo Komori

Syougo Suzuki

Kazuhisa Shigeoka

Takayasu Takubo

Taku Nishiki

Takao Maeda

Isamu Yoshida

Minoru Suzuki

Hisaaki Kura

Mitsuru Umekida

Kentarou Nishikawa

Yuichi Asano

Shin Tomogami

Yoshinori Ikeda

Masahiro Kiuchi

Morihisa Yoshioka

Yoshiaki Kuchiki

Masahiro Nobutomo

Makoto Okasaka

Hirai Isao

Kobayashi Keizo

Eiji Hora

A wheel bearing device includes a hub wheel and a wheel bearing press-fitted onto the hub wheel. A clearance is formed between at least one inner race and the hub wheel such that the at least one inner race is out of contact with the hub wheel at a position where an action line intersects with the hub wheel, the action line being a contact angle of the balls on the outboard side with the at least one inner race. A large-diameter side radially inner surface of the at least one inner race is formed as a curved surface opposed to the inner rolling surface of the at least one inner race. An axial dimension La of a corner portion of the hub wheel is 1.5 times or more as large as a radial dimension Lr thereof.

Wheel bearing device with a clearance formed between the inner race and the hub wheel

An outer member and an inner member constituting a wheel bearing device are assembled and the brake rotor is fixed to the hub ring of the inner member. In this state, the pad slide surfaces of the brake rotor are lathed with the reference provided by a wheel pilot end surface. Alternatively, the wheel pilot end surface of the hub ring by chucking the knuckle pilot of the outer member with the wheel bearing device put in its assembled state, and the pad slide surfaces of the brake rotor are lathed with the reference provided by the wheel pilot end surface.

Processing method for brake rotor-equipped wheel bearing devices

A rotation detecting device, which is compatible regardless of whether a process control device for processing an output signal of the rotation detecting device is standard one or new one having high input signal resolving power, and, also, a rotation detecting device equipped bearing assembly having such rotation detecting device, are provided. The rotation detecting device includes an encoder provided rotatably and having a plurality of circumferentially equidistantly arranged to-be-detected poles, and a sensor for detecting the to-be-detected poles. The use is made of a multiplying unit for multiplying the phase of the to-be-detected poles from an output of the sensor. The use is also made of a pulse outputting unit for receiving an output of the multiplying unit or both the output of the multiplying unit and an output of the sensor and output pulses having two multiplying powers different from each other.

Rotation detecting device and bearing equipped with rotation detecting device

To provide a sensor equipped and in-wheel motor incorporated bearing device for a vehicle wheel, which is capable of accurately detecting a rotating condition of a vehicle drive wheel and is effective to accurately control an electric drive motor or an automotive vehicle, the sensor equipped and in-wheel motor incorporated bearing device includes a wheel support bearing assembly for rotatably supporting a hub of the vehicle drive wheel, an electric drive motor providing a rotation device source for the vehicle drive wheel, and a speed reducing mechanism interposed between the electric drive motor and the wheel support bearing assembly. A rotation detecting device is also provided for detecting the rotation of an output shaft of the speed reducing mechanism.

Sensor-equipped bearing device for wheel having integrated in-wheel motor

Processing method for brake rotor-equiped wheel bearing devices

A vehicle control device capable of accomplishing a highly reliable vehicle control with the separation distance recognized correctly, even if a reduction or an error of the detecting capability occurs in the result of measurement by a separation distance measuring section for measuring the separation distance with an object such as inter-vehicle gap is provided. The control device includes a rotation detector for detecting the rotational speed of a vehicle wheel and a vehicle movement amount detecting section for detecting the amount of movement of a vehicle from an output signal thereof. The use is made of a separation distance measuring section such as a laser radar for measuring, on a non-contact basis, the separation distance between the vehicle and the object, and of a vehicle movement control section for controlling the movement of the vehicle using the separation distance and the vehicle movement amount.

Vehicle control device and rotation detection device used in same

A hub wheel () and an outer joint member () are coupled to each other through intermediation of a recess-projection fitting structure (M). The recess-projection fitting structure (M) can be separated by being applied with a pulling-out force in an axial direction under a state in which a bolt member () is removed, and can be re-formed by re-screwing the bolt member () into a bolt hole (). The hub wheel () comprises a receiving portion () for receiving the bolt member (). The shaft portion () has a small diameter portion () serving as a fit-in portion to be fitted along an inner periphery of the receiving portion () under a state in which the recess-projection fitting structure (M) is formed. The small diameter portion () is used as a part for confirming the accuracy and the state of the recess-projection fitting structure (M).

Bearing device for wheel

A wheel support bearing assembly with sensor and in-wheel motor integration, that can sense with improved accuracy the forces acting on a contact point between a wheel and a road for precise control of an electric motor unit and/or a vehicle. The bearing assembly includes a bearing unit that rotatably supports a hub of a drive wheel, an electric motor unit, and a reduction gear unit between the electric motor unit and the bearing unit. A sensor unit is associated with an outer ring of the bearing unit. The sensor unit includes a strain generator and at least one measuring sensor attached to the strain generator. The strain generator includes a thin plate including at least two fixation contact segments fixed in contact with an outer diameter surface of the outer ring.

Wheel support bearing assembly with sensor and in-wheel motor integration

A sensor equipped wheel support bearing assembly, in which detection error is relieved to accurately estimate load is provided. A vehicle body fitting flange of an outer member of the bearing assembly has a front elevational shape of line symmetry or of point symmetry. A sensor unit including a strain generating member having two or more contact fixing segments to be fixed to the outer member and a strain sensor is provided at an arcuately sectioned portion lying from the flange to the outer member, or an outer peripheral surface portion of the outer member adjoining to the outboard side thereof, or a position crossing a line segment passing through a center of a rolling element or a position adjoining thereto. Alternatively, a plurality of sensor units are provided on the outer periphery of the outer member in a fashion spaced circumferentially equidistantly.

Wheel bearing with sensor

A driving wheel bearing apparatus has an inner ringsecured to a wheel hubby a caulked portion. An outer joint memberof a constant velocity universal jointhas a shoulder portionand a cylindrical shaft portion. Face splinesandare formed at the end faces of the shoulder portionand the caulked portion. Face splinesandare supported with pressure by a fastening boltthat abuts the outer side end face of the wheel huband is threadedly connected to an internal threadof the shaft portion. Compressive remaining stress is placed on the surfaces of the face splinesandas a result of surface modification, by shot peening. The surface hardness is set at 300 Hv or more.

Driving wheel bearing apparatus

A vehicle wheel bearing apparatus has an outer member, an inner member, and at least one inner ring press fit onto a cylindrical portion of a wheel hub. Double row rolling elements are rollably contained between double row outer raceway surfaces and double row inner raceway surfaces. A constant velocity universal joint torque is inserted into the wheel hub. It is axially separably connected to the wheel hub by a securing nut. A shoulder of an outer joint member of the constant velocity universal joint abuts against the inner member. An abutting surface of the inner member that abuts the shoulder of an outer joint member is formed so that it does not include a segment of a mirror finished surface with an area exceeding 0.005 mm.

Wheel bearing apparatus for a vehicle

A cylindrical pilot portion P to be fitted to an inner periphery of a wheel () is formed at an inner diameter part of a brake rotor (). A shape of the hub wheel, in particular, the shape thereof on an outboard side is thereby simplified, and thus the hub wheel can be fabricated at low cost by cold forging or the like. An outer joint member () of an outboard side constant velocity universal joint () and a hub wheel () are connected with each other by way of a nut member ().

A vehicle wheel bearing apparatus has an outer member with a body mounting flange, an inner member and double row rolling elements freely rollably contained between the inner and outer raceway surfaces of the inner and outer members. The body mounting flange is formed with a plurality of screw apertures. An inner side flange surface of the body mounting flange is formed by machining to have a flat vertical surface relative to a longitudinal axis of a wheel hub. An outer side flange surface of the body mounting flange is formed by forging to have a tapered surface of a predetermined inclined angle. Thus, the thickness of the body mounting flange is gradually reduced radially outward.

A vehicle wheel bearing apparatus has an outer member, an inner member with at least one inner ring, double row rolling elements, and a constant velocity universal joint torque transmittably inserted into a wheel hub and axially separably connected by a securing nut. A shoulder of an outer joint member of the constant velocity universal joint abuts against a larger end face of the inner ring. The larger end face of the inner ring is formed as a ground surface. An end face of the shoulder of the outer joint member abutted against the larger end face is formed as a ground surface or a lathe-turned surface. The surface roughness Ra of at least the larger end face of the inner ring is limited to a range within 0.1&#x2dc;0.3.

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Iwata, Japan

Kiyotake Shibata