JP2008223816A - Rolling bearing device for wheel - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a rolling bearing device for a wheel reducing weight while securing sufficient stiffness of a pulsar ring, and of easy assembly and good yield. <P>SOLUTION: The rolling bearing device 1 for the wheel includes a rotary member 2 on which the wheel 12 is installed and an outer ring member 5 which rotatably supports the rotary member 2. A cover member 6 covering an end part of the rotary member 2 is attached on the end part of the rotary member 2. A magnetic member 7 which is formed out of magnetized elastic material and is measured by a sensor 14 is pasted on an outer circumference part of the cover member 6. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a wheel rolling bearing device. More particularly, the present invention relates to a rolling bearing device for a wheel including an annular magnetized member (pulsar ring) that rotates with a wheel and is measured by a sensor in order to measure the rotational speed of the wheel.

  The wheel rolling bearing device includes, for example, a hub wheel through a hub ring to which the wheel is mounted, an inner ring fitted to the outer peripheral portion of the hub ring, and rolling elements provided on the outer peripheral surface side of the hub ring and the inner ring. Has an outer ring that rotatably supports the outer ring. Conventionally, a pulsar ring as an encoder for detecting the rotational speed of the wheel is attached to the outer peripheral surface of the inner ring. The pulsar ring is formed by a support ring formed by pressing a steel plate into an annular shape, and one of the support rings. It consists of an annular magnetized rubber affixed to the side surface, and S poles and N poles are alternately magnetized in the circumferential direction on the magnetized rubber. The pulsar ring is brought close to a sensor provided on an outer ring fixed to the vehicle body side, and rotates with respect to the sensor together with the wheel. Therefore, a change in the magnetic flux density of the pulsar ring is measured by a sensor, and the rotational speed of the wheel is measured by a detection signal from the sensor.

In such a wheel rolling bearing device, in order to detect the rotation with high accuracy, it is necessary to keep the gap distance (air gap) between the magnetized surface of the magnetized rubber and the sensor constant with high accuracy. However, in the conventional pulsar ring, since the support ring supporting the magnetized rubber is formed in an annular shape, it is necessary to use a steel plate having a sufficient thickness so as not to be distorted when fitted to the outer peripheral surface of the inner ring. It will increase. In addition, it is difficult to press work and the yield decreases. In addition, since almost the entire surface of one side of the support ring is covered with magnetized rubber, there are few parts to which a jig for pressing the pulsar ring is applied when fitting the pulsar ring into the inner ring, making it difficult to assemble. For this reason, there is a problem that the yield is worsened by accidentally damaging the magnetized surface with a jig.
JP 2000-221202 A JP 2001-221241 A

  SUMMARY OF THE INVENTION An object of the present invention is to provide a wheel rolling bearing device that is easy to assemble and has a good yield while reducing the weight of the wheel rolling bearing device while ensuring sufficient rigidity of the pulsar ring.

  In order to solve the above-mentioned problems, the present invention is a rolling bearing device for a wheel having a configuration as described in each claim. That is, according to the first aspect of the present invention, the rotating member is rotatably supported via the rotating member having the flange on which the wheel is mounted and the rolling element provided on the outer peripheral surface of the rotating member. A rolling bearing device for a wheel having an outer ring member, wherein a lid member covering the end portion is attached to an end portion of the rotating member, and a magnetic force is applied to an outer peripheral portion of the lid member. And a magnetized member that is measured by a sensor.

  Therefore, since the lid member is configured to cover the rotating member, the lid member has higher rigidity than the conventional annular support ring. Therefore, the lid member is not easily distorted, and the gap distance between the magnetized member attached to the lid member and the sensor can be kept constant with high accuracy. Thereby, the measurement accuracy of the rotational speed of the wheel is improved. Moreover, since the lid member is not easily distorted, it is easy to assemble and the yield is improved, and the lid member and the magnetized member can be thinned, and the weight can be reduced by thinning.

  The lid member can be attached to the rotating member by pushing the center portion where the magnetizing member is not provided. Therefore, the magnetizing member or the like can be assembled to the rotating member without applying a force to the magnetizing member. Thereby, it can prevent that a magnetizing member deform | transforms at the time of an assembly | attachment, and can suppress the fall of the measurement precision of the wheel rotational speed by deformation | transformation of a magnetizing member.

  According to the second aspect of the present invention, a recess having a step in the axial direction is formed in the outer peripheral portion of the lid member in the direction away from the sensor, and the magnetizing member is installed in the recess. Therefore, since the magnetized member is provided in the recess, the magnetized member can be stably held with respect to the lid member. Further, since the magnetized member is provided in a hollow portion that is recessed in a direction away from the sensor, it is easy to increase the thickness. Therefore, by increasing the thickness, the magnetic force becomes stronger, and the measurement accuracy of the wheel rotation speed can be improved.

(Embodiment 1)
The first embodiment will be described with reference to FIGS. As shown in FIG. 1, the wheel rolling bearing device 1 includes an outer ring member 5 fixed to a knuckle (vehicle body side member) 11, a rolling element 8 provided on the inner peripheral side of the outer ring member 5, and the rolling element 8. And a rotating member 2 that is rotatably supported by the outer ring member 5. The rotating member 2 has a hub ring 3 and an inner ring 4 integrally.

  As shown in FIG. 1, the hub wheel 3 has a flange 3a on its outer peripheral surface. A stat bolt 3b is press-fitted into the flange 3a, and the brake rotor 13 and the wheel 12 are mounted on the stat bolt 3b. A shaft hole 3c penetrating in the axial direction is formed at the axial center of the hub wheel 3. When the wheel rolling bearing device 1 is used for a driven wheel, an axle member (not shown) is spline-fitted into the shaft hole 3c. In this embodiment, the wheel rolling bearing device 1 is used for a driven wheel, and no axle member is fitted in the shaft hole 3c.

  A groove 3d is formed on the outer peripheral surface of one end of the hub wheel 3 as shown in FIG. 1, and the inner ring 4 is fitted in the groove 3d. On the outer peripheral surface of the hub wheel 3 and the outer peripheral surface of the inner ring 4, raceway surfaces 3e and 4a on which the rolling elements 8 can roll are formed.

  As shown in FIG. 1, the outer ring member 5 has a mounting flange 5 a on the outer peripheral surface, and the mounting flange 5 a is fixed to the knuckle 11. Two rows of raceway surfaces 5 b are formed on the inner peripheral surface of the outer ring member 5. A plurality of rolling elements 8 are provided between the raceway surfaces 5b and the raceway surfaces 3e and 4a on the rotating member 2 side so as to be able to roll. The plurality of rolling elements 8 are held at predetermined intervals in the circumferential direction by a cage 9.

  As shown in FIG. 1, a cover member 6 that covers the one end is attached to the rotating member 2. The lid member 6 is made of resin or metal, and has a disc-shaped main body portion 6a that closes the shaft hole 3c, and an annular mounting portion 6b formed on the outer periphery of the main body portion 6a. As shown in FIG. 2, the mounting portion 6 b is thicker on the inner ring 4 side than the main body portion 6 a, and the inner peripheral cylindrical surface of the step portion 6 g between the main body portion 6 a and the mounting portion 6 b is fitted to the outer peripheral surface of the inner ring 4. Fixed.

  A magnetizing member 7 is attached to one side surface of the outer peripheral portion of the lid member 6 as shown in FIGS. The magnetizing member 7 is a pulsar ring having magnetic poles of different polarities alternately in the circumferential direction, and rotates with respect to the sensor 14. The magnetized member 7 is formed in a donut disk shape with an elastic body made of an elastic material such as rubber or resin as a base material, and magnetizes magnetic powder mixed in the elastic material alternately to the S pole and the N pole. Produced.

  The sensor 14 is fixed to the outer ring member 5 fixed to the vehicle body side or a member on the vehicle body side. On the other hand, the magnetized member 7 is provided on the rotating member 2 that rotates together with the wheels 12. The magnetized member 7 is close to the sensor 14 in a non-contact manner, and rotates with the wheel 12 relative to the sensor 14. Then, the change in magnetic force generated by the rotation of the magnetizing member 7 is measured by the sensor 14, and the rotational speed of the wheel is measured based on the detection signal from the sensor 14.

  As shown in FIG. 1, a sealing device 10 that seals between the outer ring member 5 and the hub ring 3 is provided. Therefore, the sealing device 10 prevents water, dust, etc. from entering the bearing from the wheel 12 side.

  The shaft hole 3 c of the rotating member 2 is closed by the lid member 6. A magnetizing member 7 made of an elastic body is provided on the outer periphery of the lid member 6. Therefore, the lid member 6 is used in place of the support ring (see Patent Document 1) that supports the magnetized member that has been conventionally required. Thus, the parts are shared. By the way, the gap between the magnetized member 7 and the sensor 14 is very small due to sensitivity and the like, and if the magnetized member 7 is not correctly attached due to distortion or the like, the gap distance with the sensor 14 is not constant, Measurement accuracy deteriorates. On the other hand, the lid member 6 to which the magnetized member 7 is attached is disk-shaped in order to close the shaft hole 3c, and has higher rigidity than a conventional annular support ring or the like. Therefore, the lid member 6 is not easily distorted at the time of assembly or the like, and the gap distance between the magnetized member 7 attached to the lid member 6 and the sensor 14 is constant. Thereby, the measurement accuracy of the rotational speed of the wheel 12 is improved.

  Further, the lid member 6 is configured to be attached to the rotating member 2 by pushing a central portion where the magnetizing member 7 is not provided. Therefore, the magnetizing member 7 or the like can be assembled to the rotating member 2 without applying a force to the magnetizing member 7. Thereby, it can prevent that the magnetizing member 7 deform | transforms at the time of an assembly | attachment, and can suppress the fall of the measurement precision of the wheel rotational speed by deformation | transformation of the magnetizing member 7. FIG.

(Embodiment 2)
A second embodiment will be described with reference to FIG. The second embodiment is different from the first embodiment in that it has a mounting portion 6c shown in FIG. 3 instead of the mounting portion 6b of the lid member 6 shown in FIG. Hereinafter, Embodiment 2 will be described focusing on these differences.

  As shown in FIG. 3, the lid member 6 has an annular mounting portion 6c on the outer peripheral portion of the main body portion 6a. The mounting portion 6 c protrudes from the main body portion 6 a toward the inner ring 4 side, and an inner peripheral cylindrical surface 6 h is fitted and fixed to the outer peripheral surface of the inner ring 4. A recess 6d having a step in the axial direction is formed on the vehicle inner side surface (left side surface in FIG. 3) of the mounting portion 6c. The recessed portion 6d is formed on the entire outermost end of the lid member 6, and is recessed in a direction away from the sensor 14 illustrated in FIG.

  A magnetizing member 15 is provided in the recess 6d. The lid member 6 is substantially flush with the vehicle inner side surface of the main body 6a, and is thicker than the magnetized member 7 shown in FIG. Therefore, the magnetized member 15 has a strong magnetic force as the thickness increases, and is easily measured by the sensor 14. Thus, the measurement accuracy of the rotational speed of the wheel is improved. In addition, the magnetized member 15 is held stably with respect to the lid member 6 because the inner peripheral surface and one side face the constituent wall surface of the recess 6d.

(Embodiment 3)
The third embodiment will be described with reference to FIG. The third embodiment is different from the first embodiment in that a part of the lid member 6 is used for the sealing device 16. Hereinafter, Embodiment 3 will be described focusing on the differences.

  As shown in FIG. 4, the lid member 6 has an outer peripheral edge portion 6e and an attachment portion 6f on the outer peripheral portion of the main body portion 6a. The outer peripheral edge 6e extends radially outward from the outer peripheral edge of the main body 6a, and the magnetized member 7 is attached to the inner surface of the vehicle (the left side in FIG. 4). The attachment portion 6 f protrudes from the outer peripheral edge of the main body portion 6 a to the inner ring 4 side, and the inner peripheral cylindrical surface 6 i is fitted and fixed to the outer peripheral surface of the inner ring 4.

  A sealing device 16 is provided between the inner ring 4 and the outer ring member 5. The sealing device 16 includes an annular metal ring 17 fitted and fixed to the inner peripheral surface of the outer ring member 5, and an annular elastic body 18 provided integrally with the metal ring 17. The elastic body 18 has a plurality of lips 18 a, 18 b and 18 c, and the lip 18 a is in sliding contact with the outer peripheral edge 6 e of the lid member 6. The lips 18 b and 18 c are in sliding contact with the outer peripheral cylindrical surface of the attachment portion 6 f of the lid member 6. Therefore, the outer peripheral edge 6e and the attachment 6f are also members that constitute a part of the sealing device 16. Thus, the parts are shared.

(Other embodiments)
The present invention is not limited to the first to third embodiments, and may be the following forms.
(1) For example, the lid member 6 of the first to third embodiments is attached to the outer peripheral surface of the inner ring 4 as shown in FIG. However, the lid member may be attached to the inner peripheral surface of the hub wheel.
(2) The rotating member 2 of the first to third embodiments has the hub wheel 3 and one inner ring 4 attached to the outer peripheral surface of the hub wheel 3 as shown in FIG. However, the rotating member may have a hub ring and a plurality of inner rings attached to the outer peripheral surface of the hub ring.
(3) The hub wheel 3 according to the first to third embodiments has a shaft hole 3c as shown in FIG. 1 and the like, and the shaft hole 3c has a configuration in which an axle member (not shown) can be fitted. It was. However, the hub wheel 3 may have a shaft hole, and the shaft hole may be formed for weight reduction. Further, it may be a solid one without the shaft hole 3c.

It is sectional drawing of the rolling bearing apparatus for wheels. It is a partial cross section enlarged view of the rolling bearing device for wheels in the vicinity of a magnetized member. It is a partial cross-sectional enlarged view of the wheel rolling bearing device according to the second embodiment in the vicinity of the magnetized member. It is a partial cross-sectional enlarged view of the wheel rolling bearing device according to the third embodiment in the vicinity of the magnetized member.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 ... Rolling bearing apparatus 2 for wheels 2 ... Rotating member 3 ... Hub wheel 3a ... Flange 3c ... Shaft hole 4 ... Inner ring 5 ... Outer ring member 5a ... Mounting flange 6 ... Lid member 6a ... Main body parts 6b, 6c, 6f ... Mounting part 6d ... Recessed parts 7, 15 ... Magnetized member (pulsar ring)
8 ... rolling element 9 ... cage 10, 16 ... sealing device 11 ... knuckle 12 ... wheel 14 ... sensor

Claims (2)

A rolling bearing device for a wheel having a rotating member having a flange on which a wheel is mounted, and an outer ring member that rotatably supports the rotating member via a rolling element provided on an outer peripheral surface of the rotating member. Because
A lid member covering the end is attached to the end of the rotating member, and a magnetized member made of an elastic body to which magnetic force is applied and measured by a sensor is attached to the outer periphery of the lid member. A rolling bearing device for a wheel characterized by being attached. It is a rolling bearing device for wheels according to claim 1,
A rolling bearing device for a wheel, wherein a hollow portion having a step in the axial direction is formed in an outer peripheral portion of the lid member in a direction away from the sensor, and a magnetizing member is installed in the hollow portion.

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