JP2009036220A - Bearing device for wheel with rotating speed detection device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a bearing device for a wheel with a rotating speed detection device, capable of securing sealing performance by enhancing air tightness of a fitting part of an outer member and a sensor holder and of preventing rusting on the outer member even if rainwater etc. enters from the fitting part. <P>SOLUTION: The bearing device for the wheel with the rotating speed detection device has the sensor holder 19 internally fitted to an end part of the outer member 5 via an interference, formed of synthetic resin by injection molding and having a rotating speed sensor 28 embedded therein. The sensor holder 19 is formed of non-magnetic synthetic resin filled with predetermined amount of a fibrous reinforcement material. A rust prevention film 30 comprising zinc nickel alloy plating is formed on the fitting face 5c of the outer member 5 and thickness of the film 30 is set in a range of 5-20 μm. Thus, this structure can prevent rusting on the outer member 5 even if rainwater etc. enters from the fitting part, and enhance the air tightness to secure fixing force of the sensor holder 19. <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.

  Generally, 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 rainwater, dust or the like, and the main lip 73a and the auxiliary of the first seal ring 70 can be prevented. Since it is isolated from the ball 53 and the rolling surface by the lip 73b, it is possible to prevent metal wear powder or the like generated by the rotation of the ball 53 from adhering to the pulsar ring 76, and to prevent a decrease in detection accuracy. .
JP 2005-98332 A

  However, such a conventional wheel bearing device with a rotational speed detecting device has a structure in which the sensor holder 79 is directly press-fitted into the end portion of the outer member 51 with a shishiro, and the sensor holder 79 is made of a resin made of a viscoelastic material. For this reason, there is a possibility that the fixing portion is distorted by press-fitting and the sealing performance cannot be secured. As a result, the fixing force of the sensor holder 79 is reduced, rainwater, dust or the like enters the bearing, and the sensor holder 79 is displaced, so that the speed detection function is not satisfied.

  Further, when the outer member 51 rusts due to rain water or the like that has entered from the fitting portion, not only the fixing force of the sensor holder 79 is reduced, but also the sensor holder 79 may fall off the outer member 51 and output detection. It becomes impossible.

  The present invention has been made in view of such circumstances, and enhances the airtightness of the fitting portion between the outer member and the sensor holder to ensure sealing performance, and even if rainwater or the like enters from the fitting portion. An object of the present invention is to provide a wheel bearing device with a rotation speed detection device that prevents the outer member from rusting.

  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 A sensor holder in which the rotational speed sensor is embedded, and a magnetic encoder configured such that characteristics in the circumferential direction change alternately and at equal intervals, and faces the rotational speed sensor via a predetermined air gap; In the wheel bearing device with a rotational speed detection device, wherein the inner seal of the seals is mounted between the sensor holder and the inner ring, and the sensor holder and the sensor holder are press-fitted Rust prevention means is provided at the fitting portion with the outer member.

  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 the wheel bearing device with a detecting device, the anticorrosion means is provided in the fitting portion between the sensor holder and the outer member into which the sensor holder is press-fitted, so even if rainwater or the like enters from the fitting portion. The outer member can be prevented from rusting, and the fixing force of the sensor holder can be secured.

  Preferably, in the invention according to claim 2, the surface hardness is higher and the wear resistance is higher than that of zinc plating or the like if a rust preventive film made of zinc nickel alloy plating is formed on the fitting surface of the outer member. In addition, it is possible to improve the airtightness and improve the sealing performance by smoothing the irregularities of the cuts on the fitting surface.

  Moreover, as long as the film thickness of the said rust preventive film is set to the range of 5-20 micrometers like invention of Claim 3, while being able to exhibit strong rust prevention power in a severe environment, It is possible to prevent the dimensional accuracy from being lowered by plating.

  Further, as in the invention described in claim 4, if the metal ring having rust prevention ability is integrally joined to the fitting portion of the sensor holder by insert molding, the sensor holder is made of a resin made of a viscoelastic material. Even so, the fitting portion can be reinforced to prevent the fitting portion from being distorted by press fitting, and the fixing force of the sensor holder can be ensured.

  If the sensor holder is made of a nonmagnetic synthetic resin filled with a predetermined amount of fibrous reinforcing material as in the invention described in claim 5, the sensing performance of the rotational speed sensor is adversely affected. In addition, it has excellent corrosion resistance and can improve strength and durability over a long period of time, and the rigidity of the sensor holder increases due to an increase in elastic modulus, and the fitting part is distorted and creep deformation occurs over time. It can be prevented from occurring. Therefore, it is possible to prevent the position of the sensor holder 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.

  According to a sixth aspect of the present invention, a connector for connecting the rotational speed sensor and a harness connected to an electronic circuit at a predetermined circumferential position of the sensor holder is inclined radially outward by a predetermined angle. If a recess is formed in the connector and the recess is fitted so as to cover the end on the inner side of the outer member, the connector is directly connected to the harness when connecting the harness. Since pressure input is received at the end of the outer member without applying pressure input, excessive force is applied to the connector and the position accuracy of the seal and rotation speed sensor does not collapse. While improving, an assembly precision can be raised.

  In addition, as in the invention according to claim 7, the inner side seal includes a core bar formed by press-molding the sensor holder from the steel plate, and a seal integrally joined to the core bar An annular seal plate made of a member, 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 in a substantially L shape by pressing from a steel plate, and fitted and fixed to the slinger The magnetic encoder is integrally joined to the pulsar ring, and the magnetic encoder is opposed to the rotational speed sensor through a predetermined radial clearance, and magnetic powder is mixed in the magnetic pole N alternately in the circumferential direction. , S is composed of a magnetized rubber magnet, and the sealing member integrally has a plurality of sealing lips, and these sealing lips are in sliding contact with the pulsar ring. It is isolated from the rolling elements and the respective rolling surfaces, and can prevent metal wear powder, etc. generated by rotation of the rolling elements from adhering to the magnetic encoder, and can maintain the desired detection accuracy over a long period of time. it can.

  Further, as in the invention described in claim 8, if the radial lip is integrally joined to the outer edge of the slinger, and the radial lip is slidably contacted with the core metal of the seal plate, the pulsar ring is sealed from the outside. It is possible to prevent contamination by dust and the like, and to maintain a desired detection accuracy over a long period of time.

  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 A sensor holder in which a rotation speed sensor is embedded, and a magnetic encoder configured so that characteristics in the circumferential direction change alternately and at equal intervals, and face the rotation speed sensor via a predetermined air gap. In addition, in the wheel bearing device with a rotational speed detection device, the inner seal of the seals is mounted between the sensor holder and the inner ring. The sensor holder and the outer side into which the sensor holder is press-fitted Since anti-corrosion means is provided at the mating part with the member, it is possible to prevent the outer member from rusting even if rainwater or the like enters from the mating part, and secure the fixing force of the sensor holder can do.

  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 having an inner rolling surface facing one of the outer rolling surfaces of the double row on the outer periphery, 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 The sensor holder in which the rotational speed sensor is embedded, and a rubber magnet in which magnetic powder is mixed and magnetic poles N and S are alternately magnetized in the circumferential direction, and a predetermined air gap is provided in the rotational speed sensor. A bearing for a wheel with a rotational speed detection device in which an inner side seal among the seals is mounted between the sensor holder and an inner ring, wherein the sensor holder includes a fiber Formed of a non-magnetic synthetic resin filled with a predetermined amount of a reinforcing material, and a rust-proof film made of zinc-nickel alloy plating is formed on the fitting surface of the outer member. It is set in the range of 5 to 20 μm.

Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.
FIG. 1 is a longitudinal sectional view showing a first embodiment of a wheel bearing device with a rotational speed detection device according to the present invention, and FIG. 2 is an enlarged view of a main part showing a detection unit of FIG. 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 includes an inner member 3 composed of a hub wheel 1 and an inner ring 2, and a double-row rolling element (ball ) 4 and 4, and an outer member 5 inserted through 4 and 4, and a constant velocity universal joint 10 is connected to the outer member 5.

  The inner member 3 includes a hub ring 1 and an inner ring 2 fixed to the hub ring 1. The hub wheel 1 integrally has a wheel mounting flange 6 for attaching a wheel (not shown) to an end portion on the outer side, an inner side rolling surface 1a on the outer side (one side) on the outer periphery, and this inner side rolling. A cylindrical small-diameter step portion 1b extending in the axial direction from the surface 1a is formed, and a serration (or spline) 1c for torque transmission is formed on the inner periphery. Hub bolts 6 a are planted at equal circumferential positions of the wheel mounting flange 6.

  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 6 with which an outer side seal 10 described later is in sliding contact. The surface hardness is hardened to a range of 58 to 64 HRC by induction hardening from the base 6b 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 2 has an inner side (other side) inner raceway surface 2a formed on the outer periphery, and is press-fitted into the small-diameter step portion 1b of the hub wheel 1 via a predetermined shimiro, and the end portion of the small-diameter step portion 1b of the hub ring 1 Is fixed in the axial direction in a state where a predetermined bearing preload is applied by a caulking portion 1d formed by plastically deforming the outer side of the shaft. The inner ring 2 and the rolling element 4 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.

  The outer member 5 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 5b for being attached to a knuckle (not shown) constituting a suspension device is integrally formed on the outer periphery. And double row outer rolling surfaces 5a, 5a facing the inner rolling surfaces 1a, 2a of the inner member 3 are integrally formed on the inner periphery. And these double row outer side rolling surfaces 5a and 5a are hardened by induction hardening in the range of the surface hardness of 58-64HRC.

  Between the double-row outer raceway surfaces 5a and 5a of the outer member 5, and the inner raceway surface 1a of the hub wheel 1 and the inner raceway surface 2a of the inner ring 2 facing these, the double-row rolling elements 4 and 4 are arranged. Is held by the cages 7 and 7 so as to be freely rollable. The end surface on the small diameter side (front side) of the inner ring 2 abuts against 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. In addition, seals 8 and 9 are attached to the opening of the annular space formed between the outer member 5 and the inner member 3, and leakage of 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 10 includes an outer joint member 11, a joint inner ring 12, a cage 13, and a torque transmission ball 14. The outer joint member 11 integrally includes a cup-shaped mouth portion 15, a shoulder portion 16 that forms the bottom portion of the mouth portion 15, and a shaft portion 17 that extends from the shoulder portion 16 in the axial direction. A serration 17a that engages with the serration 1c of the hub wheel 1 is formed on the outer periphery of the shaft portion 17, and a male screw 17b is formed at the end of the serration 17a. The outer joint member 11 is fitted into the hub wheel 1 through the serrations 1c and 17a until the end surface of the crimping portion 1d and the shoulder portion 16 abut each other, and the hub wheel is fixed by the fixing nut 18 fastened to the male screw 17b. 1 and the outer joint member 11 are detachably coupled so as to be able to transmit torque.

  In the present embodiment, the sensor holder 19 is attached to the inner end of the outer member 5. The inner seal 9 is attached to an opening in an annular space formed between the sensor holder 19 and the inner ring 2. As shown in FIG. 2, the seal 9 includes an annular seal plate 20 having a substantially L-shaped cross section, a slinger 21, and a pulsar ring 22 externally fitted to the slinger 21, and is disposed to face each other. . The seal plate 20 includes a cored bar 23 in which the sensor holder 19 is insert-molded, and a seal member 24 integrally joined to the cored bar 22 by vulcanization adhesion or the like.

  The core metal 23 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 24 is made of an elastic member such as synthetic rubber, and integrally includes a main lip 24a and a grease lip 24b.

  The slinger 21 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 21 has a cylindrical portion 21a that is press-fitted into the outer diameter of the inner ring 2, and a vertical plate portion 21b that extends radially outward from the cylindrical portion 21a. A radial lip is provided at the end of the vertical plate portion 21b. 25 are joined together by vulcanization adhesion.

  The pulsar ring 22 includes a cored bar 26 that is press-fitted into the cylindrical part 21a of the slinger 21 and a magnetic encoder 27 that is integrally joined to the outer diameter part of the cored bar 26 by vulcanization adhesion. The core metal 26 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 24 a and the grease lip 24 b of the seal member 24 are slidably contacted with the core metal 26, and the radial lip 25 of the slinger 21 is slidably contacted with the core metal 23 of the seal plate 20. On the other hand, the magnetic encoder 27 is composed of a rubber magnet in which a magnetic substance 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, and a rotary encoder for detecting the rotational speed of the wheel is provided. It is composed.

  By configuring such a seal 9, it is possible to prevent the pulsar ring 22 from being contaminated by dust entering from the outside, and the rolling element 4 by the main lip 24 a and the grease lip 24 b of the seal plate 20 slidably contacting the pulsar ring 22. In addition, since it is isolated from each rolling surface, it is possible to prevent metal wear powder or the like generated by the rotation of the rolling element 4 from adhering to the magnetic encoder 27 and maintain a desired detection accuracy over a long period of time. can do.

  The sensor holder 19 is made of a nonmagnetic resin material such as PPS (polyphenylene sulfide) and is filled with 10 to 45 wt% of a fibrous reinforcing material made of GF (glass fiber). As a result, the sensing performance of the rotation speed sensor 28 is not adversely affected, the corrosion resistance is excellent, and the strength and durability can be improved over a long period of time. Further, by filling GF, the semi-crystalline material can be used at a temperature exceeding its glass transition temperature, so that the heat resistance is improved and the rigidity is increased by the increase in the elastic modulus, and the outer member 5 In this type of sensor holder 19 that is directly press-fitted into the housing, it is possible to prevent the fitting portion from being distorted and creep deformation due to secular change.

  Here, when the GF 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 and the dimension is stabilized. Therefore, the sensor holder 19 that is directly press-fitted into the outer member 5 is not preferable. In addition to PPS, the sensor holder 19 can be exemplified by synthetic resin that can be injection molded such as PA (polyamide) 66, PBT (polybutylene terephthalate). Moreover, as a fibrous reinforcement, not only GF but CF (carbon fiber), an aramid fiber, a boron fiber, etc. can be illustrated.

  The sensor holder 19 includes a rotational speed sensor 28 that is opposed to the magnetic encoder 27 via a predetermined radial clearance (air gap). This rotational speed sensor 28 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.

  A female connector 29 for connecting the rotational speed sensor 28 and a harness (not shown) connected to the electronic circuit of the vehicle body is radially provided at a predetermined circumferential position (upper portion in the drawing in the drawing) of the sensor holder 19. It protrudes outward at a predetermined angle. The connector 29 is formed with a recess 29a, and is fitted and fixed to the outer member 5 via a predetermined shimiro so as to cover the inner end of the outer member 5. Thereby, when connecting a harness, a pressure input is not directly applied to the connector 29. That is, since this pressure input is received at the end of the outer member 5, an excessive force is not applied to the connector 29, and the positional accuracy of the seal 9 and the rotational speed sensor 28 is not lost. Thus, it is possible to provide a wheel bearing device with a rotational speed detection device capable of improving the performance and detecting the desired rotational speed by increasing the assembly accuracy.

  In the present embodiment, as an example of the rotational speed detection apparatus, an active type rotational speed detection apparatus including the magnetic encoder 27 and the rotational speed sensor 28 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.

  Here, in this embodiment, a rust preventive film 30 made of zinc-nickel alloy plating having excellent corrosion resistance is formed on the fitting surface of the outer member 5 into which the sensor holder 19 is press-fitted, that is, the inner peripheral surface 5c on the inner side. Has been. The zinc-nickel alloy plating is preferably a colored chromate containing 5 to 10% of nickel. Since this zinc-nickel alloy has higher surface hardness and higher wear resistance than galvanized, etc., it is thought that increasing the film thickness will exert a strong rust-preventive power in harsh environments. In view of accuracy limitations, it is set in the range of 5 to 20 μm. Thereby, the uneven part of the cut line of the inner peripheral surface 5c is smoothed, the airtightness of the fitting part is improved to improve the sealing performance, and the outer member 5 is protected even if rainwater or the like enters from the fitting part. Rusting can be prevented, and the fixing force of the sensor holder 19 can be secured. Therefore, combined with the effect of the recess 29a covering the inner side end of the outer member 5, it is possible to ensure the airtightness and strong sealing performance of the fitting portion. Further, it is possible to prevent the sensor holder 19 from being displaced due to a decrease in the fixing force of the sensor holder 19 and to satisfy a desired speed detection function over a long period of time.

  The above-mentioned rust preventive film 30 is not limited to zinc-nickel alloy plating, but is also black-dyed, phosphate film treatment, gin-roy plating, chromate plating, various platings such as Cr, Ni, Zn, Sn, or diffusing chromium or boron. Examples thereof include chromizing treatment, calorizing treatment, dacrotized treatment, and the like. Furthermore, the rust preventive film 30 may be a coating layer made of a synthetic resin or a coating layer coated with a paint. Further, a low-temperature thermosetting type coating layer may be formed on a plating layer provided with a coating layer on the plating layer, for example, a plating layer made of a chromate-treated film or the like. For this low temperature thermosetting type coating layer, a one-component low temperature thermosetting type coating agent is used. Further, the rust preventive film 30 may be a single coating layer formed by electrostatic powder coating. For this electrostatic powder coating, for example, powder-type epoxy paint, acrylic paint, solvent-type baking acrylic paint, aminoalkyd paint, and the like are used.

  FIG. 3 is an enlarged view of a main part showing a second embodiment of the wheel bearing device with a rotation speed detection device according to the present invention. In this embodiment, the sensor holder is basically different from the above-described embodiment. The same reference numerals are given to other parts having the same parts or the same functions, and detailed description thereof is omitted. .

  The sensor holder 31 is formed of a non-magnetic resin material such as PPS and is filled with 10 to 45 wt% of a fibrous reinforcing material made of GF, as in the embodiment described above. The sensor holder 31 is press-fitted into the inner periphery of the inner member end of the outer member 5 so that the rotational speed sensor 28 is embedded, and a harness (not shown) connected to the rotational speed sensor 28 and an electronic circuit of the vehicle body. ) Is formed so as to protrude radially outward.

  Here, a metal ring 33 made of an austenitic stainless steel plate (such as JIS standard SUS304) having rust prevention ability is integrally joined to the fitting portion of the sensor holder 31 by insert molding. Thereby, even if the sensor holder 31 is made of a resin made of a viscoelastic material, the fitting portion can be reinforced to prevent the fitting portion from being distorted by press-fitting, and rainwater or the like can enter from the fitting portion. Even if the outer member 5 is rusted, the fixing force of the sensor holder 31 can be secured.

  In addition to the austenitic stainless steel plate described above, the metal ring 33 includes, for example, various plated steel sheets such as Cr, Ni, Sn, etc., hot dip galvanized steel sheets, and after this hot dip galvanization, the plating layer is formed by heating. -Alloyed hot-dip galvanized steel sheet, zinc-aluminum alloy-plated steel sheet, so-called chromizing steel sheet or calorizing steel sheet that diffuses and infiltrates chromium or boron, or Zn-Al-Mg based plated steel sheet (trade name) : ZAM) and the like.

  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.

  A wheel bearing device with a rotation speed detection device according to the present invention includes a resin sensor holder in which a rotation speed sensor is embedded, and the sensor holder is press-fitted into an end of an outer member. Can be applied.

1 is a longitudinal sectional view showing a first embodiment of a wheel bearing device with a rotation speed detection device according to the present invention. It is a principal part enlarged view which shows the detection part of FIG. It is a principal part enlarged view which shows 2nd Embodiment of the wheel bearing apparatus with a rotational speed detection apparatus which concerns on this invention. 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, 2a ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ Inner rolling surface 1b ・ ・ ・ ・ ・ ・.... Small diameter step 1c, 17a ... Serration 1d ... Caulking part 2 ...・ ・ ・ ・ ・ ・ ・ ・ Inner ring 3 ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ Inner member 4 ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ Rolling element 5 ・・ ・ ・ ・ ・ ・ ・ ・ ・ ・ Outer member 5a ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ Outer rolling surface 5b ・ ・ ・ ・ ・ ・..... Body mounting flange 5c ..... Inner peripheral surface 6 ..... Wheel mounting flange 6a ... ······································································ ...... ············ Retainer 8 ·············· Seal 9 on the outer side Side seal 10 ... constant velocity universal joint 11 ... outer joint member 12 ...・ ・ ・ ・ ・ ・ ・ ・ ・ Fitting inner ring 13 ・ ・ ・ ・ ・ ・ Cage 14 ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ Torque transmission ball 15 ・ ・・ ・ ・ ・ ・ ・ ・ ・ Mouse part 16 ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ Shoulder part 17 ・ ・ ・ ・ ・ ・ ・ ・ Axis 17b ····························································································· Sensor holder 19a ... Fitting surface 20 ... ······································ Slinger 21a ················································・ ・ ・ ・ ・ ・ Standing plate 22 ・ ・ ・ ・ ・ ・ Pulsar ring 23, 26 ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ Core 24 ········· Sealing member 24a ············································· Grease lip 25・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ Radial lip 27 ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ Magnetic encoder 28 ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ Rotational speed sensor 29, 32 ... Connector 29a ... Recess 30 ... Prevention Rust coating 33 Metal ring 5 0 ... Double row rolling bearing 51 ... Outer member 51a・ ・ ・ ・ ・ Outer rolling surface 51b ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ Car body mounting flange 52 ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ Inner member 53 ・ ・ ・・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ Ball 54 ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ Knuckle 55 ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ Hub wheel 55a, 56a ... Inner rolling surface 55b ... Small diameter step 55c, 68a ... Serration 55d ...・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ Wheel mounting flange 56 ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ Inner ring 57 ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ Caulking Part 58 ... cage 59 ... .... Outer side seal 60 ... Inner side seal 61 ... Constant speed Fitting 62 ... Outer fitting member 63 ... Fitting inner ring 64 ...・ ・ ・ ・ Cage 65 ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ Torque transmission ball 66 ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ Mouse part 67 ・ ・ ・ ・ ・ ・・ ・ ・ ・ ・ ・ ・ ・ Shoulder 68 ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ Shaft 68b ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ Male thread 69 ・ ・ ・··················································· First seal ring 71 2 seal rings 72, 74, 77... Core metal 73. ············ Sealing member 73a ······························································・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ Radial lip 76 ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ Pulsar ring 78 ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ Multi-pole magnet Rotor 79 ... Sensor holder 80 ... Magnetic sensor 81 ... ···connector

Claims (8)

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 sensor holder that is fitted into the end of the outer member on the inner side through a shimoshiro, is formed by injection molding from a synthetic resin, and the rotational speed sensor is embedded;
A characteristic relating to the circumferential direction is configured to change alternately and at equal intervals, and provided with a magnetic encoder facing the rotational speed sensor via a predetermined air gap,
In the wheel bearing device with a rotational speed detection device, the inner seal of the seals is mounted between the sensor holder and the inner ring.
A wheel bearing device with a rotational speed detecting device, wherein a rust prevention means is provided at a fitting portion between the sensor holder and the outer member into which the sensor holder is press-fitted.   The wheel bearing device with a rotational speed detection device according to claim 1, wherein a rust preventive film made of zinc-nickel alloy plating is formed on a fitting surface of the outer member.   The wheel bearing device with a rotation speed detection device according to claim 2, wherein a film thickness of the rust preventive film is set in a range of 5 to 20 μm.   The wheel bearing device with a rotation speed detection device according to claim 1, wherein a metal ring having a rust-preventing ability is integrally joined to the fitting portion of the sensor holder by insert molding.   The wheel bearing device with a rotational speed detection device according to any one of claims 1 to 4, wherein the sensor holder is formed of a nonmagnetic synthetic resin filled with a predetermined amount of fibrous reinforcing material.   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 wheel bearing device with a rotation speed detecting device according to any one of claims 1 to 5, wherein the wheel bearing device is formed and fitted so as to cover the inner end of the outer member.   The seal on the inner side includes an annular seal plate composed of a core metal formed by press-molding the sensor holder and pressed from a steel plate, and a seal member integrally joined to the core metal, and the seal plate A slinger that is press-fitted into the outer diameter of the inner ring and that has a substantially L-shaped cross section by pressing from a steel plate, and a pulsar ring that is fitted and fixed to the slinger and the magnetic encoder is integrally joined. The magnetic encoder comprises a rubber magnet facing the rotational speed sensor through a predetermined radial gap, mixed with magnetic powder, and magnetic poles N and S are alternately magnetized in the circumferential direction; The rotational speed according to any one of claims 1 to 6, wherein the seal member integrally includes a plurality of seal lips, and the seal lips are in sliding contact with the pulsar ring. Out equipped wheel bearing apparatus.   The wheel bearing device with a rotation speed detecting device according to claim 7, wherein a radial lip is integrally joined to an outer edge of the slinger, and the radial lip is slidably contacted with a core metal of the seal plate.

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