JP2008303900A - Wheel bearing device with rotational speed detector - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a wheel bearing device with a rotational speed detector in which a sensor holder is prevented from being creep-deformed by enhancing the assemblability and the rigidity of the sensor holder. <P>SOLUTION: This wheel bearing device with a rotational speed detector comprises a sensor holder 20 fitted into the end of an outer member 3 with an interference fit, formed of a synthetic resin by injection molding, and surrounding a rotational speed sensor 29. A seal 11 comprises an annular seal plate 21 having the core 24 to which the sensor holder 20 is insert-molded and a seal member 25 joined to the core, a slinger 22 press-fitted to an inner ring 6, and a pulser ring 23 having magnetic encoders 28 alternately magnetized in magnetic poles N, S in the circumferential direction. Since the sensor holder 20 is filled with 10-45 wt.% glass fiber, the elastic modulus of the sensor holder 20 is increased, and the rigidity thereof is increased. Therefore, the sensor holder is prevented from being creep-deformed due to the deformation of the fitting part thereof. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a wheel bearing device with a rotation speed detection device that includes a rotation speed sensor that detects the rotation speed of a wheel of an automobile or the like.

  A wheel bearing with a rotation speed detecting device in which a wheel of an automobile is rotatably supported with respect to a suspension device and a device for detecting the rotation speed of the wheel for controlling an anti-lock brake system (ABS) is incorporated in the bearing. Devices are generally known. Conventionally, in such a wheel bearing device, a sealing device is provided between an inner member and an outer member that are in rolling contact with a rolling element, and a magnetic encoder in which magnetic poles are alternately arranged in a circumferential direction is provided as the sealing device. In addition, the rotational speed detecting device is constituted by a magnetic encoder and a rotational speed sensor that is arranged facing the magnetic encoder and detects a magnetic pole change of the magnetic encoder accompanying the rotation of the wheel.

  In general, the rotational speed sensor is attached to the knuckle after the wheel bearing device is attached to the knuckle constituting the suspension device. However, in order to eliminate the complexity of the air gap adjustment work between the rotation speed sensor and the magnetic encoder and to achieve further compactness, recently, a bearing apparatus for a wheel with a rotation speed detection device in which the rotation speed sensor is also incorporated in the bearing. Has been proposed.

  A structure as shown in FIG. 4 is known as an example of such a wheel bearing device with a rotational speed detection device. In this wheel bearing device with a rotational speed detection device, a hub wheel 55, a double row rolling bearing 50, and a constant velocity universal joint 61 are detachably unitized. The double row rolling bearing 50 includes an outer member 51, an inner member 52, and double rows of balls 53 and 53. The outer member 51 integrally has a vehicle body mounting flange 51b to be attached to the knuckle 54 constituting the suspension device on the outer periphery, and double row outer rolling surfaces 51a and 51a are integrally formed on the inner periphery. .

  On the other hand, the inner member 52 includes a hub ring 55 and an inner ring 56 fixed to the hub ring 55. The hub wheel 55 integrally has a wheel mounting flange 55d for mounting a wheel (not shown) at one end portion, and an inner rolling surface facing one of the double-row outer rolling surfaces 51a, 51a on the outer periphery. 55a and a cylindrical small-diameter step 55b extending in the axial direction from the inner rolling surface 55a are formed, and a serration 55c for torque transmission is formed on the inner periphery.

  The inner ring 56 is formed with an inner rolling surface 56a opposite to the other of the double row outer rolling surfaces 51a, 51a on the outer periphery, and is press-fitted into the small-diameter step portion 55b of the hub wheel 55 through a predetermined shimiro. . And the inner ring | wheel 56 is fixed to the axial direction by the crimping part 57 formed by carrying out the plastic deformation of the edge part of the small diameter step part 55b to radial direction outward.

  Double-row balls 53 and 53 are disposed between the double-row outer raceway surfaces 51 a and 51 a of the outer member 51, and the inner raceway surface 55 a of the hub wheel 55 and the inner raceway surface 56 a of the inner ring 56. It is accommodated and is held by the cages 58 and 58 so as to be freely rollable. Further, seals 59 and 60 are attached to the opening portion of the annular space formed between the outer member 51 and the inner member 52, and leakage of the lubricating grease sealed inside the bearing and the inside of the bearing from the outside. Prevents intrusion of rainwater and dust.

  The constant velocity universal joint 61 includes an outer joint member 62, a joint inner ring 63, a cage 64 and a torque transmission ball 65. The outer joint member 62 integrally includes a cup-shaped mouth portion 66, a shoulder portion 67 that forms the bottom portion of the mouth portion 66, and a shaft portion 68 that extends from the shoulder portion 67 in the axial direction. A serration 68a that engages with the serration 55c of the hub wheel 55 is formed on the outer periphery of the shaft portion 68, and a male screw 68b is formed at the end of the serration 68a. Then, the outer joint member 62 is fitted into the hub wheel 55 through the serrations 55c and 68a so that torque can be transmitted, and the hub wheel 55 and the outer joint member 62 are detachable by a fixing nut 69 fastened to the male screw 68b. It has become.

  As shown in FIG. 5, the seal 60 is a so-called pack seal in which a first seal ring 70 and a second seal ring 71 are combined. The first seal ring 70 is attached to the outer member 51, a core metal 72 having a substantially L-shaped cross section, and a seal member that is attached to the core metal 72 and includes a main lip 73a and an auxiliary lip 73b. 73.

  The second seal ring 71 is attached to the inner ring 56 and includes a cored bar 74 having a substantially L-shaped cross section and a radial lip 75 attached to the cored bar 74. A pulsar ring 76 is attached to the second seal ring 71. The pulsar ring 76 includes a core metal 77 that is fitted on the core metal 74 and has a substantially U-shaped cross section, and a multipolar magnet rotor 78 that is attached to the core metal 77. This multipolar magnet rotor 78 is magnetized from the radial direction so that rubber or resin containing magnetic powder is vulcanized and bonded and the N poles and S poles are alternately arranged in the circumferential direction.

  Here, a sensor holder 79 is laminated on the entire outer peripheral surface of the cored bar 72 in the first seal ring 70. The sensor holder 79 is formed of a nonmagnetic resin material such as polyphenylene sulfide (PPS), and a magnetic sensor 80 is embedded therein. A female connector 81 that connects the magnetic sensor 80 and a harness (not shown) connected to the electronic circuit of the vehicle body protrudes radially outward at a predetermined circumferential position of the sensor holder 79. It is integrally formed.

As described above, since the radial lip 75 is disposed outside the pulsar ring 76, the pulsar ring 76 can be prevented from being contaminated by dust or the like, and the main lip 73a and the auxiliary lip 73b of the first seal ring 70 can be prevented. Therefore, the metal wear powder or the like generated by the rotation of the ball 53 can be prevented from adhering to the pulsar ring 76, and a decrease in detection accuracy can be avoided.
JP 2005-98332 A

  However, in such a conventional wheel bearing device with a rotational speed detection device, the female connector 81 is integrally formed at a predetermined circumferential position of the sensor holder 79 in a state of projecting vertically outward in the radial direction. An unreasonable force acts on the press-fit fixing portion when 81 is connected, and not only the positional accuracy of the first seal ring 70 and the magnetic sensor 80 is lost, but also the resin sensor holder 79 itself may be damaged.

  Further, since the sensor holder 79 is made of a resin which is a viscoelastic material, the press-fit fixing portion may be distorted and may be creep-deformed due to secular change. When the fixing force is reduced due to this creep deformation, the sensor holder 79 is displaced, and the speed detection function is not satisfied.

  The present invention has been made in view of such circumstances, and it is an object of the present invention to provide a wheel bearing device with a rotation speed detection device that improves the assembly of a sensor holder and increases the rigidity to prevent creep deformation. It is said.

  In order to achieve the object, the invention according to claim 1 of the present invention has a vehicle body mounting flange integrally attached to the suspension on the outer periphery, and a double row outer rolling surface is integrally formed on the inner periphery. A hub wheel having a wheel mounting flange for mounting a wheel at one end and a small-diameter step portion extending in the axial direction on the outer periphery, and press-fitting into the small-diameter step portion of the hub ring An inner member formed of at least one inner ring formed on the outer periphery and formed with a double-row inner rolling surface opposite to the double-row outer rolling surface, and both rolling of the inner member and the outer member. A double row rolling element housed between the running surfaces so as to be freely rollable, a seal attached to an opening of an annular space formed between the outer member and the inner member, and the outer member It is fitted inside the end on the inner side through a shimoshiro and formed from synthetic resin by injection molding In the wheel bearing device with a rotational speed detection device including the sensor holder in which the rotational speed sensor is embedded, the inner seal of the seals is insert-molded, and the steel sheet is pressed from a steel plate by press working. An annular seal plate formed of a formed cored bar and a seal member integrally joined to the cored bar, and press-fitted into the outer diameter of the inner ring so as to face the seal plate. A slinger formed in an L-shape, and fitted and fixed to the slinger, facing the rotational speed sensor through a predetermined radial clearance, so that the characteristics in the circumferential direction change alternately and at equal intervals. The sensor holder is filled with a predetermined amount of fibrous reinforcing material.

  As described above, the rotational speed of the inner ring rotating type including the sensor holder that is fitted into the inner side end portion of the outer member through a shimoshiro, is formed by injection molding from a synthetic resin, and the rotational speed sensor is embedded. In a wheel bearing device with a detection device, a seal on the inner side of the seal is composed of a core metal insert-molded from a sensor holder and formed by pressing from a steel plate, and a seal member integrally joined to the core metal. An annular seal plate, a slinger that is press-fitted into the outer diameter of the inner ring so as to face the seal plate, and has a cross-section formed into a substantially L shape by pressing from a steel plate, and fitted and fixed to the slinger, and a rotational speed sensor The pulser has a magnetic encoder that is opposed to each other via a predetermined radial clearance and whose characteristics in the circumferential direction change alternately and at equal intervals. Since the sensor holder is filled with a predetermined amount of fibrous reinforcement, the hermeticity of the pulsar ring is improved and the sensor holder can be used at a temperature exceeding its glass transition temperature. And the rigidity is increased by increasing the elastic modulus. Therefore, in this type of sensor holder that is directly press-fitted into the outer member, it is possible to prevent the fitting portion from being distorted and creep deformation due to secular change, and to prevent displacement of the sensor holder due to a decrease in fixing force. In addition, a desired speed detection function can be satisfied over a long period of time.

  In the invention described in claim 2, the fibrous reinforcing material is made of any one of glass fiber, carbon fiber, aramid fiber, and boron fiber.

  Preferably, as in the invention described in claim 3, if the fibrous reinforcing material is made of glass fiber and the filling amount is set in a range of 10 to 45 wt%, the effect is sufficiently exerted. Further, it is possible to prevent the fibers in the molded product from causing anisotropy and increase in the density to reduce the dimensional stability.

  According to a fourth aspect of the present invention, a connector for connecting the rotational speed sensor and a harness connected to an electronic circuit is inclined radially outward by a predetermined angle at a predetermined circumferential position of the sensor holder. And a recess is formed in the connector, and the recess is fitted and fixed to the outer member via a predetermined shimiro so as to cover the inner end of the outer member. Therefore, when connecting the harness, pressure is not applied directly to the connector, but pressure is received at the end of the outer member, so an excessive force acts on the connector and the position of the seal or rotational speed sensor The accuracy is not lost, and the reliability and assemblability can be improved and the assembling accuracy can be increased.

  Further, as in the invention described in claim 5, if the seal member integrally has a plurality of seal lips, and these seal lips are slidably contacted with the pulsar ring, they are isolated from the rolling elements and the respective rolling surfaces. In addition, it is possible to prevent metal wear powder or the like generated by the rotation of the rolling element from adhering to the pulsar ring, and to maintain a desired detection accuracy over a long period of time.

  Further, as in the sixth aspect of the present invention, if a radial lip is joined to the outer edge of the slinger and is slidably contacted with the core of the seal plate, the pulsar ring is sealed from the outside and is contaminated by dust or the like. Therefore, the desired detection accuracy can be maintained over a long period of time.

  According to a seventh aspect of the present invention, the magnetic encoder comprises a rubber magnet in which magnetic powder is mixed in an elastomer, and magnetic poles N and S are alternately magnetized in the circumferential direction, and the seal plate If the core metal is made of an austenitic stainless steel plate, the detection accuracy can be improved without adversely affecting the magnetic detection.

  The wheel bearing device with a rotational speed detection device according to the present invention has a vehicle body mounting flange integrally attached to the suspension on the outer periphery, and an outer side in which a double row outer rolling surface is integrally formed on the inner periphery. And a hub wheel integrally having a wheel mounting flange for mounting a wheel at one end thereof and having a small-diameter step portion extending in the axial direction on the outer periphery, and at least one press-fitted into the small-diameter step portion of the hub ring An inner member formed of two inner rings and having an outer periphery formed with a double-row inner rolling surface opposite to the double-row outer rolling surface, and between both rolling surfaces of the inner member and the outer member. A double row rolling element housed in a freely rollable manner, a seal mounted in an opening of an annular space formed between the outer member and the inner member, and an inner end of the outer member It is fitted into the part via a shimiro and is formed by injection molding from synthetic resin In the wheel bearing device with a rotational speed detection device including the sensor holder in which the rotational speed sensor is embedded, the inner seal of the seals is formed by insert molding the sensor holder and pressing the steel plate. And an annular seal plate made of a seal member integrally joined to the metal core, and press-fitted into the outer diameter of the inner ring so as to face the seal plate. A slinger formed in a shape, and fitted and fixed to the slinger, are opposed to the rotational speed sensor via a predetermined radial clearance, and the characteristics in the circumferential direction are alternately and equally spaced. And a pulsar ring having a magnetic encoder, and the sensor holder is filled with a predetermined amount of fibrous reinforcing material. With improved, the glass transition temperature the heat resistance of the sensor holder is improved because it can be used at temperatures above, rigidity is increased by the increase of the elastic modulus. Therefore, in this type of sensor holder that is directly press-fitted into the outer member, it is possible to prevent the fitting portion from being distorted and creep deformation due to secular change, and to prevent displacement of the sensor holder due to a decrease in fixing force. In addition, a desired speed detection function can be satisfied over a long period of time.

  An outer member integrally having a vehicle body mounting flange for mounting to a suspension device on the outer periphery, a double row outer rolling surface formed integrally on the inner periphery, and a wheel mounting flange for mounting a wheel on one end A hub wheel integrally formed and formed on the outer periphery with an inner rolling surface facing one of the outer rolling surfaces of the double row, and a small-diameter step portion extending in the axial direction from the inner rolling surface, and the hub wheel An inner member comprising an inner ring that is press-fitted into a small-diameter step portion and has an outer race formed with an inner race surface facing the other of the outer row raceways in the double row, and both the inner member and the outer member. A double row rolling element housed between the rolling surfaces so as to be freely rollable, a seal attached to an opening of an annular space formed between the outer member and the inner member, and the outer member It is fitted inside the end of the inner side through a predetermined shimoshiro and formed from synthetic resin by injection molding In the wheel bearing device with a rotational speed detection device provided with the sensor holder in which the rotational speed sensor is embedded, the inner seal of the seals is insert-molded from the non-magnetic steel plate. An annular seal plate composed of a cored bar formed by pressing and a sealing member integrally joined to the cored bar, and press-fitted into the outer diameter of the inner ring facing the seal plate, and pressed from the steel plate by pressing A slinger with a substantially L-shaped cross section, and a rubber magnet fitted and fixed to the slinger, facing the rotational speed sensor through a predetermined radial clearance, and magnetic material powder mixed into the elastomer. And a pulsar ring having a magnetic encoder in which magnetic poles N and S are alternately magnetized in the circumferential direction, and glass fibers in the sensor holder are 10 to 45 w. % Are filled.

Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.
1 is a longitudinal sectional view showing an embodiment of a wheel bearing device with a rotational speed detection device according to the present invention, FIG. 2 is a side view of the bearing portion of FIG. 1, and FIG. 3 is a rotational speed detection of FIG. It is a principal part enlarged view which shows an apparatus. In the following description, the side closer to the outer side of the vehicle in a state assembled to the vehicle is referred to as the outer side (left side in the drawing), and the side closer to the center is referred to as the inner side (right side in the drawing).

  This wheel bearing device with a rotational speed detection device is called a third generation structure for driving wheels, and is constituted by unitizing the hub wheel 1, the double row rolling bearing 2 and the constant velocity universal joint 8. The double-row rolling bearing 2 includes an outer member 3, an inner member 4, and double-row rolling elements (balls) 5 and 5.

  The outer member 3 is made of medium and high carbon steel containing 0.40 to 0.80 wt% of carbon such as S53C, and a vehicle body mounting flange 3b to be attached to a knuckle (not shown) constituting a suspension device is integrally formed on the outer periphery. And double row outer rolling surfaces 3a, 3a are integrally formed on the inner periphery. And these double row outer side rolling surfaces 3a and 3a are hardened in the surface hardness of the range of 58-64HRC by induction hardening.

  On the other hand, the inner member 4 includes a hub wheel 1 and an inner ring 6 fixed to the hub wheel 1. The hub wheel 1 integrally has a wheel mounting flange 7 for mounting a wheel (not shown) at an end portion on the outer side, and on the outer side (on the outer side facing the double-row outer raceway surfaces 3a and 3a on the outer periphery). On the other hand, an inner rolling surface 1a and a cylindrical small-diameter step portion 1b extending in the axial direction from the inner rolling surface 1a are formed, and a serration (or spline) 1c for torque transmission is formed on the inner periphery. . Hub bolts 7 a are implanted at equal circumferential positions on the wheel mounting flange 7.

  The hub wheel 1 is made of medium and high carbon steel containing 0.40 to 0.80 wt% of carbon such as S53C, and includes an inner rolling surface 1a and an inner side of a wheel mounting flange 7 on which an outer seal 10 described later is in sliding contact. The surface hardness is hardened in the range of 58 to 64 HRC by induction hardening from the base 7b to the small diameter step 1b. In addition, the crimping part 1d mentioned later is made into the surface hardness after forging without being quenched.

  The inner ring 6 is formed with an inner side (other side) inner rolling surface 6a facing the double row outer rolling surfaces 3a and 3a on the outer periphery, and a small diameter step portion 1b of the hub wheel 1 via a predetermined scissors. It is press-fitted. The inner ring 6 is fixed to the hub wheel 1 in the axial direction by a caulking portion 1d formed by plastically deforming the end of the small-diameter stepped portion 1b radially outward. The inner ring 6 and the rolling element 5 are made of high carbon chrome steel such as SUJ2, and are hardened in the range of 58 to 64 HRC up to the core part by quenching.

  Between the double-row outer raceway surfaces 3a and 3a of the outer member 3, and the inner raceway surface 1a of the hub wheel 1 and the inner raceway surface 6a of the inner ring 6 facing these, the double-row rolling elements 5 and 5 are provided. Is held by the cages 9 and 9 so as to be freely rollable. The end surface on the small diameter side (front side) of the inner ring 6 abuts with the shoulder portion of the hub wheel 1 in a butted state to constitute a so-called back-to-back type double-row angular ball bearing. Further, seals 10 and 11 are attached to the opening portion of the annular space formed between the outer member 3 and the inner member 4, and leakage of the lubricating grease sealed inside the bearing and the inside of the bearing from the outside. Prevents intrusion of rainwater and dust.

  The constant velocity universal joint 8 includes an outer joint member 12, a joint inner ring 13, a cage 14 and a torque transmission ball 15. The outer joint member 12 integrally includes a cup-shaped mouth portion 16, a shoulder portion 17 that forms the bottom portion of the mouth portion 16, and a shaft portion 18 that extends from the shoulder portion 17 in the axial direction. A serration 18a that engages with the serration 1c of the hub wheel 1 is formed on the outer periphery of the shaft portion 18, and a male screw 18b is formed at the end of the serration 18a. The outer joint member 12 is fitted into the hub wheel 1 through the serrations 1c and 18a until the end surface of the crimping portion 1d and the shoulder portion 17 abut each other, and the hub wheel is fixed by the fixing nut 19 fastened to the male screw 18b. 1 and the outer joint member 12 are detachably coupled so that torque can be transmitted.

  Here, in this embodiment, the sensor holder 20 is attached to the inner end of the outer member 3. The inner seal 11 is attached to an opening of an annular space formed between the sensor holder 20 and the inner ring 6. As shown in FIG. 3, the seal 11 includes an annular seal plate 21 having a substantially L-shaped cross section, a slinger 22, and a pulsar ring 23 externally fitted to the slinger 22, and is disposed to face each other. . The seal plate 21 includes a cored bar 24 in which the sensor holder 20 is insert-molded, and a seal member 25 integrally bonded to the cored bar 24 by vulcanization adhesion or the like.

  The core metal 24 is used for pressing a corrosion-resistant steel plate, for example, an austenitic stainless steel plate (JIS standard SUS304 type or the like) or a rust-proof cold rolled steel plate (JIS standard SPCC type or the like). The cross section is substantially L-shaped. In particular, a non-magnetic austenitic stainless steel plate that does not adversely affect magnetic detection is preferred. The seal member 25 is made of an elastic member such as synthetic rubber, and has a main lip 25a and a grease lip 25b integrally.

  The slinger 22 is formed by pressing a corrosion-resistant steel plate, for example, an austenitic stainless steel plate (JIS standard SUS304 type or the like) or a rust-proof cold rolled steel plate (JIS standard SPCC type or the like). The cross section is substantially L-shaped. The slinger 22 includes a cylindrical portion 22a that is press-fitted into the outer diameter of the inner ring 6, and a vertical plate portion 22b that extends radially outward from the cylindrical portion 22a. A radial lip is provided at the end of the vertical plate portion 22b. 26 are joined together by vulcanization adhesion.

  The pulsar ring 23 includes a core metal 27 press-fitted into the cylindrical portion 22a of the slinger 22 and a magnetic encoder 28 joined integrally to the outer diameter portion of the core metal 27 by vulcanization adhesion. The core metal 27 is made of a ferromagnetic steel plate, for example, a ferritic stainless steel plate (JIS standard SUS430 or the like) or a rust-proof cold rolled steel plate (JIS standard SPCC or the like), and is pressed. The cross section is formed in a substantially U shape by processing. The main lip 25 a and the grease lip 25 b of the seal member 25 are slidably contacted with the core metal 27, and the radial lip 26 of the slinger 22 is slidably contacted with the core metal 24 of the seal plate 21. On the other hand, the magnetic encoder 28 is integrally joined to the outer diameter portion of the pulsar ring 23 by vulcanization adhesion. The magnetic encoder 28 is made of a rubber magnet in which a magnetic powder such as ferrite is mixed in an elastomer such as rubber, and magnetic poles N and S are alternately magnetized in the circumferential direction to constitute a rotary encoder for detecting the rotational speed of the wheel. is doing.

  By constructing such a seal 11, it is possible to prevent the pulsar ring 23 from being contaminated by dust and the like, and the rolling element 5 and each rolling element by the main lip 25 a and the grease lip 25 b of the seal plate 21 slidably contacting the pulsar ring 23. Since it is isolated from the surface, it is possible to prevent metal wear powder or the like generated by the rotation of the rolling element 5 from adhering to the pulsar ring 23, and to maintain a desired detection accuracy over a long period of time.

  Here, in the present embodiment, the sensor holder 20 is formed of a nonmagnetic resin material such as PPS (polyphenylene sulfide) and filled with a fibrous reinforcing material to be described later. The sensor holder 20 is embedded with a rotational speed sensor 29 that faces the magnetic encoder 28 via a predetermined radial clearance (air gap). This rotational speed sensor 29 incorporates a magnetic detecting element such as a Hall element, a magnetoresistive element (MR element) or the like that changes its characteristics according to the flow direction of magnetic flux, and a waveform shaping circuit that adjusts the output waveform of this magnetic detecting element. IC. Thereby, a low-cost and highly reliable rotational speed detection device can be obtained. The sensor holder 20 may be exemplified by synthetic resin such as PA (polyamide) 66, PBT (polybutylene terephthalate) or the like other than the materials described above.

  A female connector 30 for connecting the rotational speed sensor 29 and a harness (not shown) connected to an electronic circuit of the vehicle body is integrally formed at a predetermined circumferential position of the sensor holder 20. The connector 30 is formed with a recess 30a, and is fitted and fixed to the outer member 3 via a predetermined shimiro so as to cover the inner end of the outer member 3. Further, the connector 30 protrudes radially outward at a predetermined angle. Thereby, when connecting a harness, a pressure input is not applied directly to the connector 30. That is, this pressure input is received at the end of the outer member 3. Therefore, an excessive force does not act on the connector 30 and the positional accuracy of the seal 11 and the rotational speed sensor 29 is not lost, so that the reliability and assembling can be improved and the assembling accuracy can be improved to detect a desired rotational speed. It is possible to provide a wheel bearing device with a rotation speed detection device that can be used.

  In the present embodiment, as an example of the rotational speed detection apparatus, an active type rotational speed detection apparatus including the magnetic encoder 28 and the rotational speed sensor 29 including a magnetic detection element such as a Hall element is illustrated. The rotational speed detection device is not limited to this, and may be, for example, a passive type including a gear and the like, and a circular coil wound with a magnet.

  The sensor holder 20 made of PPS is filled with 10 to 45 wt% of a fibrous reinforcing material, here, GF (glass fiber). By filling the GF, the semi-crystalline material can be used at a temperature exceeding the glass transition temperature, so that the heat resistance is improved and the rigidity is increased by the increase in the elastic modulus. In this type of sensor holder 20 that is directly press-fitted, it is possible to prevent the fitting portion from being distorted and creep deformation due to secular change. Therefore, it is possible to prevent the position of the sensor holder 20 from being displaced due to a decrease in the fixing force, and to satisfy a desired speed detection function over a long period of time.

  Here, when the filling amount is less than 10 wt%, the effect is not exhibited, and when the filling amount exceeds 45 wt%, the fibers in the molded product cause anisotropy and the density increases, resulting in dimensional stability. It is not preferable for the sensor holder 20 to be lowered and directly press-fitted into the outer member 3. In addition, as a fibrous reinforcement, not only GF but CF (carbon fiber), an aramid fiber, a boron fiber, etc. can be illustrated other than this.

  The embodiment of the present invention has been described above, but the present invention is not limited to such an embodiment, and is merely an example, and various modifications can be made without departing from the scope of the present invention. Of course, the scope of the present invention is indicated by the description of the scope of claims, and further, the equivalent meanings described in the scope of claims and all modifications within the scope of the scope of the present invention are included. Including.

  The wheel bearing device with a rotation speed detection device according to the present invention can be applied to a wheel bearing device in which any type of rotation speed detection device having an inner ring rotation structure is incorporated.

It is a longitudinal cross-sectional view which shows one Embodiment of the wheel bearing apparatus with a rotational speed detection apparatus which concerns on this invention. It is a side view of the bearing part of FIG. It is a principal part enlarged view which shows the rotational speed detection apparatus of FIG. It is a longitudinal cross-sectional view which shows the conventional wheel bearing apparatus with a rotational speed detection apparatus. It is a principal part enlarged view of FIG.

Explanation of symbols

1 ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ Hub wheel 1a, 6a ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ Inner rolling surface 1b ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・.... Small diameter step 1c, 18a ... Serration 1d ... Caulking part 2 ...・ ・ ・ ・ ・ ・ ・ ・ Double row rolling bearing 3 ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ Outside member 3a ・ ・ ・ ・ ・ ・ ・ ・ Outside Rolling surface 3b .... Body mounting flange 4 ... Inner member 5 ...・ ・ ・ ・ ・ ・ ・ ・ ・ Rolling element 6 ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ Inner ring 6 b ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ Small diameter part 7 ・ ・・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ Wheel mounting flange 7a ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ Hub bolt 7b ・ ・ ・············ Base 8 ······················································································ 10 ... Outer side seal 11 ... Inner side seal 12 ... ········· Outer joint member 13 ······················································································・ ・ ・ ・ ・ Torque transmission ball 16 ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ Mouse part 17 ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ Shoulder part 18 ········· Shaft 18b ···································································· Nut 20 ... Sensor holder 21 ... ... Seal plate 22 ... Slinger 22a ... Cylindrical part 22b ... .... Standing plate part 23 ... Pulsar ring 24, 27 ... Core metal 25 ... ······· Sealing member 25a ······································· Grease lip 26 · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · Magnetic encoder 29 ··········· Connector 30a ········································ Rolling bearings 51 ............ outside Member 51a ... Outer rolling surface 51b ... Car body mounting flange 52 ... .... Inner member 53 ... Ball 54 ... Knuckle 55 ...・ ・ ・ ・ ・ ・ ・ ・ ・ Hub wheels 55a, 56a ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ Inner rolling surface 55b ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ Small diameter step portions 55c, 68a ... .... Serration 55d ..... Wheel mounting flange 56 ..... Inner ring 57 ... ················································································ Outer seal 60 ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ Inner seal 1 ···································· constant velocity universal joint 62・ ・ ・ ・ ・ Fitting inner ring 64 ・ ・ ・ ・ ・ Cage 65 ・ ・ ・ ・ ・ Torque transmission ball 66 ・ ・ ・ ・ ・・ ・ ・ ・ ・ ・ ・ ・ ・ Mouse part 67 ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ Shoulder part 68 ・ ・ ・ ・ ・ ・ ・ ・ Shaft part 68b ・ ・·························································. Seal ring 71 ... 2nd seal rings 72, 74, 77 ... Core metal 73 ...・ ・ ・ ・ ・ Seal member 73a ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ Main lip 73b ・ ・ ・Auxiliary lip 75 Radial lip 76 Pulsar ring 78 ..... Multi-pole magnet rotor 79 ..... Sensor holder 80 ...・ Magnetic sensor 81 ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ Connector

Claims (7)

An outer member integrally having a vehicle body mounting flange for mounting to a suspension device on the outer periphery, and an outer rolling surface of a double row integrally formed on the inner periphery;
From a hub wheel integrally having a wheel mounting flange for mounting a wheel at one end and having a small-diameter step portion extending in the axial direction on the outer periphery, and at least one inner ring press-fitted into the small-diameter step portion of the hub ring An inner member in which a double row inner rolling surface facing the outer rolling surface of the double row is formed on the outer periphery,
A double row rolling element housed so as to be freely rollable between both rolling surfaces of the inner member and the outer member;
A seal attached to an opening of an annular space formed between the outer member and the inner member;
A wheel bearing with a rotational speed detection device, comprising: a sensor holder that is fitted into an inner side end portion of the outer member through a shimoshiro and formed by injection molding from a synthetic resin and embedded with a rotational speed sensor In the device
Among the seals, the inner side seal includes a cored bar formed by insert-molding the sensor holder and press-worked from a steel plate, and an annular seal plate made of a seal member integrally joined to the cored bar, A slinger that is press-fitted into the outer diameter of the inner ring so as to face the seal plate and that has a cross-section formed in a substantially L shape by pressing from a steel plate, and is fitted and fixed to the slinger, and has a predetermined radial direction on the rotational speed sensor And a pulsar ring having a magnetic encoder configured so that the characteristic in the circumferential direction changes alternately and at equal intervals, and the sensor holder is filled with a predetermined amount of fibrous reinforcing material. A wheel bearing device with a rotational speed detection device.   The wheel bearing device with a rotation speed detecting device according to claim 1, wherein the fibrous reinforcing material is made of any one of glass fiber, carbon fiber, aramid fiber, and boron fiber.   The wheel bearing device with a rotation speed detecting device according to claim 1 or 2, wherein the fibrous reinforcing material is made of glass fiber and the filling amount is set in a range of 10 to 45 wt%.   A connector for connecting the rotational speed sensor and the harness connected to the electronic circuit is provided at a predetermined circumferential position of the sensor holder so as to protrude radially outward at a predetermined angle, and a recess is provided in the connector. The rotation speed according to any one of claims 1 to 3, wherein the rotation speed is formed and fixed to the outer member via a predetermined shimiro so that the recess covers the inner end of the outer member. Wheel bearing device with detection device.   The wheel bearing device with a rotational speed detection device according to any one of claims 1 to 4, wherein the seal member integrally includes a plurality of seal lips, and the seal lips are in sliding contact with the pulsar ring.   The wheel bearing device with a rotation speed detecting device according to any one of claims 1 to 5, wherein a radial lip is joined to an outer edge of the slinger and is slidably contacted with a core metal of the seal plate.   The magnetic encoder is composed of a rubber magnet in which magnetic powder is mixed into an elastomer, and magnetic poles N and S are alternately magnetized in the circumferential direction, and the core metal of the seal plate is formed of an austenitic stainless steel plate. A wheel bearing device with a rotational speed detection device according to any one of claims 1 to 6.

Images