Abstract: In order to detect the rotational speed of a wheel secured to a rolling bearing unir 2a with high accuracy, an encoder 19a secured to an outer peripheral surface of an inside end of an inner ring 6a is formed from a Fe—Cr—Co magnet. As a result, the magnetic properties do not become uneven depending on the position on the encoder 19a, and the rotational speed of the wheel can be detected with high accuracy.

Abstract: A cylindrical liner 29 made from steel is inserted into a knuckle 3b made from a light alloy, when casting the knuckle. Then, an outer ring 6b constituting a wheel bearing unit is internally secured to the inner diameter side of the liner 29. The finishing-process of double row outer ring raceways 11a and 11b formed on the inner peripheral surface of the outer ring 6b may be performed prior to internally securing the outer ring 6b to the liner 29. Since it is not necessary to set a knuckle 5b, which is large and complex in shape, into processing equipment to perform finishing-process of the respective outer ring raceways 11a and 11b, it realizes a structure enabling a reduction in the total weight and the number of assembling steps, of the knuckle and the wheel bearing unit, thereby reducing the total manufacturing cost.

Abstract: Rotation torque of the hub rotating together with the road wheel is reduced to improve the driving performance of the vehicle such as acceleration performance, fuel consumption. The opening at both ends of the space where balls 14, 14 are provided is covered by seal rings 16c, 16d each having two or three seal lips. The whole rotation torque of the both seal rings 16c, 16d based on the friction between the seal lips and the mating surface is reglated between 0.06 N·m and 0.4 N·m.

Abstract: In a rolling bearing unit for supporting a vehicle wheel, the traveling performance represented by acceleration performance and fuel consumption performance is improved by reducing the rotational torque of a hub rotating together with a wheel. An opening at an inside end of a space where balls are placed is closed by a cap, and another opening at an outside end thereof is sealed by a seal ring having three seal lips. The rotational resistance of the seal ring is limited within a range of 0.03 to 0.2 N·m resulting from the friction between the respective seal lips and the counterpart surfaces.

Abstract: The rotor of a braking apparatus is fitted onto a cylindrical positioning portion 19a, and in this condition, fixed to the hub 8a using bolts which are threaded into the screw holes 11a in the rotating flange 10a, and tightened. As the hub 8a rotates, the runout in the radial direction of the outer peripheral surface 20a of the cylindrical positioning portion 19a is controlled up to 15 ?m, to suppress the runout of the vehicle wheel. With this construction, running performance such as riding comfort and diving stability is improved.

Abstract: Attachment holes 15 are formed in a plurality of locations in the circumferential direction of the attachment flange 13. The amount “h” of projection, from an attachment surface 14 in the axial direction, of the opening edge peripheral portion of the respective attachment holes 15 is limited to no larger than 10 m under the condition that studs 9 are press-fitted and fixed into the respective attachment holes 15. By this configuration, it is possible to inhibit the runout of the rotor 2 fixed to the attachment surface 14 of the attachment flange 13 and thereby inhibit the judder generated during braking operation.

Abstract: The wheel rim of a vehicle wheel is fitted onto a cylindrical positioning portion 19a, and in this condition, fixed to the hub 8a using bolts which are threaded into the screw holes 11a in the rotating flange 10a, and tightened. As the hub 8a rotates, the runout in the radial direction of the outer peripheral surface 20a of the cylindrical positioning portion 19a is controlled up to 15 ?m, to suppress the runout of the vehicle wheel. With this construction, running performance such as riding comfort and diving stability is improved.

Abstract: The outer race 2 is fixed to the support hole 29 in the knuckle 1, and the constant velocity joint 6 is connected to the hub 3. The first seal ring 9 is fitted into the outer race 2 to cover the opening on the end of the bearing space 26. The seal ring 28 is fitted into the support hole 29 to cover the opening on the end of the detection space 27. The encoder 7 is fitted onto the inner race 4, and the outer peripheral edge of the encoder 7 faces the inner peripheral surface on the outer race 2 in an adjacent arrangement relationship to form a labyrinth clearance 36, so that grease within the bearing space 26 is prevented from leaking toward the detection space 27, whereby the rotation resistance is small to improve parts of the automobile in acceleration and fuel consumption.

Abstract: A rotation-speed sensor device is provided to comprise an encoder supported by a rotating race of a rolling bearing unit for vehicle wheel support to be concentric with the rotating race and having a detected portion the characteristics of which are alternately changed in a circumferential direction, a rotation detection sensor supported by a non-rotating member on the vehicle chassis side and having a detecting portion facing the detected portion to produce a detection signal, a wireless transmission device for sending the detection signal from the rotation detection sensor to a controller provided on the vehicle chassis side, and a self-diagnosis circuit to judge whether there is an error or not in the rotation detection sensor.

Abstract: It is prevented that magnetic foreign matter adheres the magnet encoder 3a to deteriorate the reliability of rotation speed detection with the sensor 4a. The encoder 3a is provided on the outside of the combined seal ring 19 with reference to the bearing interior space 24, and the sensor 4a faces the encoder 3a. The knuckle 21 is placed close to the housing 33 of the drive shaft member 28 of the constant velocity joint 27 to form a labyrinth seal 20. The width of the clearance of this labyrinth seal 20 is up to 40% of the pitch of adjacent S-poles and N-poles that are arranged on the detected surface of the encoder 3a. With this construction, larger foreign matter is prevented from attaching to the detected surface of the encoder 3a to solve the above subject.

Abstract: A rotation-speed sensor device is provided to comprise an encoder supported by a rotating race of a rolling bearing unit for vehicle wheel support to be concentric with the rotating race and having a detected portion the characteristics of which are alternately changed in a circumferential direction, a rotation detection sensor supported by a non-rotating member on the vehicle chassis side and having a detecting portion facing the detected portion to produce a detection signal, a wireless transmission device for sending the detection signal from the rotation detection sensor to a controller provided on the vehicle chassis side, and a self-diagnosis circuit to judge whether there is an error or not in the rotation detection sensor.

Abstract: A rolling bearing unit has a rotational speed detection device which is comprised of a sensor having a yoke, a pair of permanent magnets and coil, and a tone wheal which is made by press-forming a magnetic metal plate so as to comprise a cylindrical support base secured onto an end portion of the bearing unit, a ring-shaped first detecting part which is bent radially outward from the inner rim of the cylindrical support base, and a cylindrical shaped second detecting part which extends axially from the outer peripheral rim of the first detecting part the first and second detecting parts having a ferro-magnetic first portion and a non-magnetic second portion, and the yoke having opposite ends to be faced to the first and second portions, and the permanent magnets being faced to each other so that magnetic fluxes flow alternatively through the yoke corresponding the rotation of the tone wheel.

Abstract: A rolling bearing unit with rotating speed detector comprises a stationary outer ring member, a rotating inner ring assembly, a rolling elements between the outer ring member and inner ring assembly, a sensor mounted to the outer ring member and a tone wheel mounted to the inner ring assembly and having a cylindrical portion faced to the sensor, such that the portion is formed with an outward facing flange to which a jig can be applied.

Abstract: A rolling bearing unit with rotating speed sensor comprising a stationary outer ring member having an outer ring raceway on an inner peripheral face thereof, a rotatable inner ring member having an inner ring raceway on an outer peripheral face thereof, a plurality of rolling elements provided between the outer ring raceway and the inner ring raceway, an annular tone wheel secured to the end portion of the inner ring member and having a cylindrical peripheral portion formed with rotating cutouts circumferentially with a uniform space therebetween, a cover comprising a synthetic resin block and a metal portion and having a cylindrical engaging portion fixed to the open end portion of the outer ring member by engaging the engaging portion with the inner peripheral face of the outer ring member, an annular sensor embedded in the resin block having a peripheral face such that the peripheral face thereof opposes partly the peripheral portion of the tone wheel, and a guide formed on at least one of the tone wheel a

Abstract: A rolling bearing unit with rotating speed sensor comprising a stationary outer ring member having an outer ring raceway, a rotatable inner ring member having an inner ring raceway, a plurality of rolling elements rotatably provided between the outer ring raceway and the inner ring raceway, a cylindrical magnetic tone wheel fixed to the inner ring member and, having a cylindrical fixing portion fitted onto the inner ring member, a cylindrical detecting portion provided concentric with the cylindrical fixing portion and formed with rotating cutouts, and a stepped portion provided between the cylindrical fixing portion and the cylindrical detecting portion, and a cover comprising a synthetic resin block and a metal portion to be securely mounted to the outer ring member, and an annular sensor embedded in the synthetic resin block so as to be opposed to the tone wheel, and the cylindrical fixing portion having an inner peripheral face on which a plurality of engagement portions are arranged in a single circle to

Abstract: A rolling bearing unit with rotating speed detector is mounted to a hub and has a sensor comprising an axially magnetized permanent magnet 38 having first and second end faces, a pole piece 37 to which the first end face is abutted, a back yoke 39 to which the second end face is abutted to be closer to the hub 1, a coil 32 having a smaller in diameter than the hub and provided around the back yoke 39, so that the density of the magnetic flux flowing through the back yoke 39 changes as the phase changes in the cutouts 45 and 44 in the pole piece 37 and the tone wheel 13a.

Abstract: A bearing unit with a rotational speed detection unit has a tone wheel which has recesses on its outer peripheral surface and rotates with the magnetic hub and the inner ring, a sensor which has a first stator with notches and a second stator, and a permanent magnet, so that due to the changes in phase of the notches and recesses, the density of the magnetic flux from the permanent magnet is changed, with the magnetic flux led to the second stator and to the hub and inner ring, whereby the number of winding in the coil is increased.

Abstract: A hub unit has a hub with a nut tightened at an axially inner end which is partly projected from the nut. A tone wheel is secured to the axially inner end of the hub. The tone wheel has an outer cylindrical portion provided around the nut and having magnetic properties changing alteratively in a circumferential direction with a uniform interval. An outer ring is provided, which has an axially inner open end. A cover covers the axially inner open end of the outer ring. The hub unit also has a sensor of a passive type supported by the cover and having a detecting portion facing to the outer periphery of the outer cylindrical portion of the tone wheel.

Abstract: A rolling bearing unit with rotating speed sensor comprising a stationary outer ring member having an outer ring raceway, a rotatable inner ring member having an inner ring raceway, a plurality of rolling elements rotatably provided between the outer ring raceway and the inner ring raceway, a cylindrical magnetic tone wheel fixed to the inner ring member and, having a cylindrical fixing portion fitted onto the inner ring member, a cylindrical detecting portion provided concentric with the cylindrical fixing portion and formed with rotating cutouts, and a stepped portion provided between the cylindrical fixing portion and the cylindrical detecting portion, and a cover comprising a synthetic resin block and a metal portion to be securely mounted to the outer ring member, and an annular sensor embedded in the synthetic resin block so as to be opposed to the tone wheel, and the cylindrical fixing portion having an inner peripheral face on which a plurality of engagement portions are arranged in a single circle to

Abstract: A rolling bearing unit with rotating speed sensor comprising a stationary outer ring member having an outer ring raceway on an inner peripheral face, thereof, a rotatable inner ring member having an inner ring raceway on an outer peripheral face thereof, a plurality of rolling elements provided between the outer ring raceway and the inner ring raceway, an annular tone wheel secured to the end portion of the inner ring member and having a cylindrical peripheral portion formed with rotating cutouts circumferentially with a uniform space therebetween, a cover comprising a synthetic resin block and a metal portion and having a cylindrical engaging portion fixed to the open end portion of the outer ring member by engaging the engaging portion with the inner peripheral face of the outer ring member, an annular sensor embedded in the resin block having a peripheral face such that the peripheral face thereof opposes partly the peripheral portion of the tone wheel, and a guide formed on at least one of the tone wheel