JP2009052708A - Assembly method for bearing device for wheel with rotating speed detection device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an assembly method for a bearing device for a wheel with a rotating speed detection device, in which gas tightness at an engagement part of a sensor holder is improved, and assembly precision is increased to improve reliability. <P>SOLUTION: A guide tool 30, and a press-fitting tool 31 slidably inserted and engaged with it are provided, with a connector 19b of the sensor holder 19 set in a specific phase to a mounting hole 5c in a car body mounting flange 5b, a support rod 32 fixed to make the same pitch circle diameter and the same phase as the mounting hole 5c, and a cut 30a formed at a corresponding position to the connector 19b to extend axially. The method is provided with a process of holding the sensor holder 19 with the press-fitting tool 31, as the press-fitting tool 31 is united with the guide tool 30, a process of engaging the guide tool 30 with an outer member 5 on the outside of it, and inserting the support rod 32 to the mounting hole 5c, and a process of sliding the press-fitting tool 31 along the guide tool 30 to press-fit the sensor holder 19 to the outer member 5. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a method of assembling a wheel bearing device with a rotation speed detection device incorporating a rotation speed sensor for detecting 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. 5 is known as an example of such a wheel bearing device with a rotational speed detection device. The wheel bearing device 50 with a rotational speed detection device includes an outer member 51, an inner member 53 inserted into the outer member 51 via double rows of balls 52, and the outer member 51 and the inner member. And a rotational speed detection device 54 mounted in an opening of an annular space formed between the member 53 and the member 53.

  The outer member 51 integrally has a vehicle body mounting flange 51b to be attached to a knuckle (not shown) constituting a suspension device on the outer periphery, and double row outer rolling surfaces 51a, 51a are integrated on the inner periphery. Is formed. On the other hand, the inner member 53 includes a hub wheel 55 and an inner ring 56 fixed to the hub wheel 55. The hub wheel 55 integrally has a wheel mounting flange 57 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 and 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. .

  Double rows of balls 52, 52 are disposed between the double row outer raceway surfaces 51 a, 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, which are opposed thereto. It is accommodated and is held by the cages 58 and 58 so as to be freely rollable. In addition, seals 59 and 60 are attached to the opening portion of the annular space formed between the outer member 51 and the inner member 53, 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 rotational speed detection device 54 includes a sensor holder 62 in which a magnetic sensor 61 is embedded, and a seal 60. As shown in FIG. 6, the sensor holder 62 is molded from synthetic resin by injection molding, and is insert-molded integrally with a core metal 65 constituting the seal 60. The seal 60 is a so-called pack seal in which a first seal ring 63 and a second seal ring 64 are combined. The first seal ring 63 is attached to the outer member 51, and a cored bar 65 having a substantially L-shaped cross section, and is attached to the cored bar 65, and a side lip 66a and a pair of radial lips 66b, 66c. And a seal member 66 having

  The second seal ring 64 is attached to the inner ring 56 and has a slinger 67 having a substantially L-shaped cross section, and a pulsar ring 68 that is externally fitted to the slinger 67 and has a substantially U-shaped cross section. Consists of. The slinger 67 has a cylindrical portion 67a that is press-fitted into the outer diameter of the inner ring 56 and a standing plate portion 67b that extends radially outward from the cylindrical portion 67a. The pulsar ring 68 is press-fitted into the cylindrical portion 67a of the slinger 67. ing.

  The pulsar ring 68 includes a cylindrical inner diameter portion 68a that is press-fitted into the cylindrical portion 67a of the slinger 67, a standing plate portion 68b that extends radially outward from the inner diameter portion 68a, and an outer surface that extends from the standing plate portion 68b in the axial direction. It has a diameter portion 68c. A multipolar magnet rotor 69 is attached to the outer diameter portion 68c. The multi-pole magnet rotor 69 is magnetized from the radial direction so that rubber or resin containing magnetic powder is vulcanized and bonded, and the N and S poles are alternately arranged in the circumferential direction. Further, the side lip 66 a of the seal member 66 is in sliding contact with the upright plate portion 68 b of the pulsar ring 68, and the pair of radial lips 66 b and 66 c are in sliding contact with the cylindrical portion 67 a of the slinger 67. Here, a male connector 70 for connecting the magnetic sensor 61 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 62. (See FIG. 5).

  In the rotational speed detection device 54, after the first seal ring 63 and the pulsar ring 68 are combined, the inner diameter portion 68a of the pulsar ring 68 is press-fitted into the slinger 67, so that all the components are assembled in advance. By pressing in the axial direction, the cored bar 65 is fitted into the end of the outer member 51, and the cylindrical part 67 a of the slinger 67 is press-fitted into the small diameter part 56 b of the inner ring 56. With such a configuration, separation of the cored bar 65 and the sensor holder 62 can be prevented, and intrusion of moisture from the boundary between the cored bar 65 and the sensor holder 62 can be prevented.

As described above, the core metal 65 constituting the first seal ring 63 is press-fitted and fixed to the inner periphery of the end portion of the outer member 51, so that the inside of the bearing is interposed between the outer member 51 and the first seal ring 63. In addition, it is possible to prevent moisture from entering the side wall, and since the side lip 66a of the seal member 66 is slidably contacted with the upright plate portion 68b of the pulsar ring 68, the gap between the first seal ring 63 and the second seal ring 64 is reduced. Therefore, it is possible to prevent moisture from entering the bearing. In addition, since the metal portion is formed between the magnetic sensor 61 and the multipolar magnet rotor 69, it is possible to prevent the cored bar 65 from adversely affecting the detection accuracy of the magnetic sensor 61.
Japanese Patent Laid-Open No. 2005-133772

  In such a conventional wheel bearing device 50 with a rotational speed detection device, the first seal ring 63 and the pulsar ring 68 are combined, and then the inner diameter portion 68a of the pulsar ring 68 is press-fitted into the slinger 67. As shown in FIG. 6, the connector 70 is formed so as to protrude from the sensor holder 62 in the axial direction and has a step δ1. Since there is a level difference δ2 between the second seal ring 64 and the standing plate portion 67b of the slinger 67, a press-fitting jig 71 (shown by hatching in the drawing) as shown in FIGS. When the annular sensor holder 62 and the slinger 67 including the connector 70 are pressed into the outer member 51 and the inner ring 56, the respective steps are inserted into the press-fitting jig 71. It is necessary to provide steps corresponding to δ1 and δ2.

  However, it is not only a factor to increase the cost to process the step in the press-fitting jig 71 with high accuracy, but when the step of the press-fitting jig 71 varies due to processing errors, the sensor holder 62 and the outer member 51 are pressed. Does not adhere to each other, and a gap is formed between the two, thereby impairing airtightness. Further, a positioning error of the slinger 67 with respect to the inner ring 56 may occur, and the side lip 66a of the sealing member 66 may vary and the sealing performance may deteriorate. In particular, when an excessive pressing force is generated in the sensor holder 62, there is a possibility that minute cracks are generated in the resin sensor holder 62, the durability is lowered, and the speed detection cannot be performed.

  Furthermore, when press-fitting the sensor holder 62 into the outer member 51, it is necessary to position and press-fit the phase of the connector 70 of the sensor holder 62. If the connector 70 is press-fitted in a state where it is displaced in the circumferential direction, after the wheel bearing device is assembled to the vehicle, the harness is insufficient in length and disconnected, or conversely, the harness is loosened and the peripheral components It is not preferable because it interferes.

  The present invention has been made in view of such circumstances, and improves the airtightness of the fitting portion of the sensor holder, and improves the assembly accuracy and improves the reliability of the wheel bearing device with a rotational speed detection device. It is an object to provide an assembly method.

  In order to achieve the object, the method 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 mounting hole is formed in the vehicle body mounting flange. A hub having an outer member integrally formed with an outer rolling surface of a double row and a wheel mounting flange for mounting a wheel at one end portion, and a small-diameter step portion extending in the axial direction on the outer periphery. An inner member formed of a ring and at least one inner ring press-fitted into a small-diameter step portion of the hub wheel, and formed with a double-row inner rolling surface facing the double-row outer rolling surface on the outer periphery; A double row rolling element accommodated between the rolling surfaces of the inner member and the outer member so as to roll freely, and an opening in an annular space formed between the outer member and the inner member And a seal attached to the inner side end of the outer member. An annular holder body formed by injection molding of grease, a sensor holder formed of a connector formed integrally with the holder body protruding at a predetermined circumferential position, and a rotational speed sensor embedded therein, and the rotational speed And a pulsar ring having a detected portion whose characteristics in the circumferential direction alternately and at equal intervals are opposed to each other through an air gap, and the sensor holder is formed by insert molding of the seal on the inner side. An annular seal plate made of a cored bar formed by pressing from a steel plate and a seal member integrally joined to the cored bar, and disposed opposite to the seal plate, and press-fitted into the outer diameter of the inner ring And a standing plate that extends radially outward from the cylindrical portion and faces the inner circumference of the sensor holder via a slight radial clearance. And a method of assembling a wheel bearing device with a rotational speed detection device comprising a slinger having a cross section formed into an L shape by pressing from a steel plate, wherein the connector of the sensor holder is attached to the mounting hole of the vehicle body mounting flange The support rod is fixed so as to have the same pitch circle diameter and the same phase as the mounting holes of the vehicle body mounting flanges, and extends in the axial direction to the portion corresponding to the connector. The sensor includes a guide jig in which a notch is formed, and a press-fitting jig that is slidably inserted into the guide jig, and the press-fitting jig is inserted into the guide jig to form a unit. Fitting and holding a holder in the press-fitting jig; bringing the guide jig into contact with the outer member; and inserting the support bar into the mounting hole; and the guide jig A step of press-fitting the sensor holder into the outer member by sliding a press-fitting jig holding the sensor holder along the guide jig in a state in which the axial centers of the outer member and the outer member are aligned. And.

  In this way, a seal attached to the opening of the annular space formed between the outer member and the inner member, and an end on the inner side of the outer member, synthetic resin is formed by injection molding An annular holder main body, a sensor holder formed integrally with the holder main body protruding in a predetermined circumferential position of the holder main body, and a rotational speed sensor embedded therein, and the rotational speed sensor via an air gap The palsar ring has a detected portion whose characteristics in the circumferential direction alternately and at equal intervals, and the inner seal of the seal is formed by press molding from a steel plate by insert molding of the sensor holder. And an annular seal plate made of a seal member integrally joined to the core metal, and a circle that is disposed opposite the seal plate and press-fitted into the outer diameter of the inner ring And a vertical plate portion extending radially outward from the cylindrical portion and facing the inner circumference of the sensor holder through a slight radial clearance, and the cross section is formed into an L shape by pressing from the steel plate In a method of assembling a wheel bearing device with a rotational speed detection device provided with a formed slinger, the connector of the sensor holder is set so as to be in a predetermined phase with respect to the mounting hole of the vehicle body mounting flange. A guide jig in which a support rod is fixed so as to have the same pitch circle diameter and the same phase as the mounting hole of the mounting flange, and a notch extending in the axial direction is formed in a portion corresponding to the connector, and slides on this guide jig A press-fitting jig that is freely inserted, and a step of fitting and holding the sensor holder to the press-fitting jig while the press-fitting jig is inserted into the guide jig to form a unit; With the outer member abutting on the outer member and inserting the support rod into the mounting hole, with the guide jig and the outer member being aligned with the axial center of the guide jig, And a step of press-fitting the sensor holder into the outer member by sliding along the tool, so that the connector of the sensor holder can be press-fitted and positioned in a desired circumferential direction with respect to the outer member. The sensor holder can be mounted at the position. Therefore, after the wheel bearing device is assembled in the vehicle, it is possible to reliably prevent the harness from being short-circuited and disconnected, or conversely, the harness loosening and interfering with surrounding parts. It is possible to provide a wheel bearing device with a rotational speed detection device with improved accuracy and improved reliability. Here, the predetermined phase refers to a phase preset for each model between the connector of the sensor holder and the mounting hole of the vehicle body mounting flange.

  Preferably, as in the invention described in claim 2, a recess is formed in a portion corresponding to the connector of the press-fitting jig so as to be recessed from the end face more than a step between the connector and the holder body. If the press-fitting jig is fitted and inserted into the guide jig in a state where the phase of the notch of the guide jig and the notch of the guide jig are matched, the end surface of the press-fitting jig abuts the holder body of the sensor holder. The sensor holder can be positioned and fixed to the outer member with high accuracy without interfering with the connector by simply pressing and allowing the airtightness of the fitting portion between the sensor holder and the outer member. Can be improved.

  Further, as in the invention according to claim 3, if the wheel bearing device is mounted in a state where the outer side surface of the wheel mounting flange is in a vertically downward direction and is in contact with the pedestal, The assembly process of the rotational speed detection device can be provided continuously in the assembly line of the bearing device for the machine, the layout of the process can be simplified, the axes of each component and jig can be easily aligned, and the assembly is performed with high accuracy. Can do.

  According to a fourth aspect of the present invention, the guide jig is fitted on the inner side end of the outer member, and the inner side end surface of the outer member and the inner side of the vehicle body mounting flange are fitted. If it is placed in contact with at least one of its side surfaces, the press-fitting operation can be performed with the axial center of the guide jig and the outer member accurately aligned, preventing misalignment and the sensor. The holder can be accurately positioned and fixed to the outer member without twisting the holder.

  Further, as in the invention described in claim 5, if the end surface of the holder main body of the sensor holder and the inner side surface of the standing plate portion of the slinger are set to be flush with each other, the press-fitting jig The sensor holder and slinger including the seal plate are assembled in advance, and the end surface of the press-fitting jig can be easily brought into contact with the end surface of the holder body and the side surface of the sling plate by pressing the whole in the axial direction. In addition, the rotational speed detection device can be assembled to the bearing portion, and the assembly man-hour can be reduced and the assembly accuracy can be improved.

  Further, as in the invention described in claim 6, the core metal of the seal plate is a cylinder in which the sensor holder is insert-molded, and a part of which is exposed is fitted into the end of the outer member. And an inner diameter portion extending radially inward from the cylindrical portion, and the seal member is joined to the inner diameter portion, the sensor holder is not twisted when the sensor holder is press-fitted into the outer member. It is possible to press-fit with high accuracy, and to have a strong proof strength and to improve the airtightness of the fitting portion.

  According to a seventh aspect of the present invention, a side lip and a radial lip are formed on the seal member, and the pulsar ring is a cylindrical inner diameter portion that is press-fitted into the cylindrical portion of the slinger, and the inner diameter A vertical plate extending radially outward from the upper portion and an outer diameter portion extending axially from the vertical plate and joined integrally with the magnetic encoder. The cross section is U-shaped by pressing from a steel plate. If the side lip is slidably contacted with the vertical plate portion of the pulsar ring and the radial lip is slidably contacted with the cylindrical portion of the slinger, the magnetic encoder is rotated by the side lip and the radial lip. It is possible to reliably prevent metal wear powder, etc., generated by the rotation of the rolling elements from adhering to the magnetic encoder from being isolated from the running surface, and to make the pulsar ring a slinger. The sling and the sensor holder including the seal plate are assembled in advance, and the end surface of the press-fitting jig is brought into contact with the end surface of the holder main body and the side surface of the standing plate portion of the slinger to press the whole in the axial direction. The rotational speed detection device can be assembled to the bearing portion, and the number of assembly steps can be further reduced.

  The method of assembling a wheel bearing device with a rotational speed detection device according to the present invention has a vehicle body mounting flange integrally attached to a suspension device on the outer periphery, a mounting hole is formed in the vehicle body mounting flange, and a plurality of components are mounted on the inner periphery. An outer member in which the outer rolling surface of the row is integrally formed, and a hub wheel integrally 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 an inner member formed of at least one inner ring press-fitted into a small-diameter step portion of the hub wheel, and having an inner periphery formed with a double row inner rolling surface facing the double row outer rolling surface on the outer periphery thereof, A double row rolling element housed movably between both rolling surfaces of the outer member and the outer member, and an opening in an annular space formed between the outer member and the inner member Attached to the inner side end of the outer member An annular holder body formed by injection molding of grease, a sensor holder formed of a connector formed integrally with the holder body protruding at a predetermined circumferential position, and a rotational speed sensor embedded therein, and the rotational speed And a pulsar ring having a detected portion whose characteristics in the circumferential direction alternately and at equal intervals are opposed to each other through an air gap, and the sensor holder is formed by insert molding of the seal on the inner side. An annular seal plate made of a cored bar formed by pressing from a steel plate and a seal member integrally joined to the cored bar, and disposed opposite to the seal plate, and press-fitted into the outer diameter of the inner ring And a standing plate that extends radially outward from the cylindrical portion and faces the inner circumference of the sensor holder via a slight radial clearance. And a method of assembling a wheel bearing device with a rotational speed detection device comprising a slinger having a cross section formed into an L shape by pressing from a steel plate, wherein the connector of the sensor holder is attached to the mounting hole of the vehicle body mounting flange The support rod is fixed so as to have the same pitch circle diameter and the same phase as the mounting holes of the vehicle body mounting flanges, and extends in the axial direction to the portion corresponding to the connector. A guide jig having a notch formed therein, and a press-fitting jig that is slidably inserted into the guide jig, and the press-fitting jig is inserted into the guide jig to form a unit. A step of fitting and holding a sensor holder in the press-fitting jig; a step of bringing the guide jig into contact with the outer member; and inserting the support bar into the mounting hole; and the guide jig. A step of press-fitting the sensor holder into the outer member by sliding a press-fitting jig holding the sensor holder along the guide jig in a state in which the axial centers of the outer member and the outer member are aligned. Therefore, the connector of the sensor holder can be press-fitted in a positioned state, and the sensor holder can be mounted at a desired circumferential position with respect to the outer member. Therefore, after the wheel bearing device is assembled in the vehicle, it is possible to reliably prevent the harness from being short-circuited and disconnected, or conversely, the harness loosening and interfering with surrounding parts. It is possible to provide a wheel bearing device with a rotational speed detection device with improved accuracy and improved reliability.

  An outer member integrally having a vehicle body mounting flange for mounting to a suspension device on the outer periphery, a mounting hole formed in the vehicle body mounting flange, and an outer rolling surface of a double row integrally formed on the inner periphery, and one end A wheel mounting flange for mounting the wheel on the part, 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 an inner member comprising an inner ring that is press-fitted into a small-diameter step portion of the hub ring and has an inner rolling surface that faces the other of the double-row outer rolling surfaces, A double row rolling element housed movably between both rolling surfaces of the outer member and the outer member, and an opening in an annular space formed between the outer member and the inner member Attached to the inner side end of the outer member and synthetic resin for injection molding A ring-shaped holder main body, and a sensor holder that is formed integrally with the holder main body projecting at a predetermined circumferential position of the holder main body, and a rotational speed sensor embedded in the sensor holder. And a pulsar ring having a magnetic encoder composed of a rubber magnet in which magnetic powder is mixed in the elastomer and magnetic poles N and S are alternately magnetized in the circumferential direction. The seal on the side is opposed to the seal plate, an annular seal plate made 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. A cylindrical portion that is press-fitted into the outer diameter of the inner ring, and extends radially outward from the cylindrical portion and slightly between the inner periphery of the sensor holder. In a method of assembling a wheel bearing device with a rotational speed detecting device, comprising a slinger comprising a standing plate portion facing each other through a directional clearance and having a cross-section formed into a substantially L shape by pressing from a steel plate, the wheel mounting The wheel bearing device is mounted in a state where the outer side surface of the flange is in the vertical direction and is in contact with the pedestal, and the connector of the sensor holder is in a predetermined phase with respect to the mounting hole of the vehicle body mounting flange. The support rod was fixed so as to have the same pitch circle diameter and the same phase as the mounting holes of these vehicle body mounting flanges, and a notch extending in the axial direction was formed at a portion corresponding to the connector. A guide jig, and a press-fitting jig that is slidably inserted into the guide jig and has a recess formed in a portion corresponding to the connector, and the positions of the notch and the recess. A step of fitting and holding the sensor holder in the press-fitting jig in a state in which the press-fitting jig is inserted into the guide jig to form a unit. The sensor holder is held in a state in which the guide rod and the outer member are aligned with the step of fitting the end on the inner side end of the member and inserting the support rod into the mounting hole. And a step of press-fitting the sensor holder into the outer member by sliding the press-fitting jig along the guide jig.

Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.
FIG. 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 an enlarged view of a main part of FIG. 1, and FIG. 3 is a rotational speed detection according to the present invention. Explanatory drawing which shows the assembly method of an apparatus, FIG. 4 is the arrow line view seen from the IV-IV line of FIG. In the following description, the side closer to the outside of the vehicle in the state assembled to the vehicle is referred to as an outer side (left side in FIG. 1), and the side closer to the center is referred to as an inner side (right side in FIG.

  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. A hub bolt 6a for fastening the wheel is planted at the circumferentially equidistant position of the wheel mounting flange 6.

  The hub wheel 1 is made of medium-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 on which an outer seal 8 to be described later comes into 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 by non-hardening.

  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 ring 1 through a predetermined shimoshiro. And the end part of this small diameter step part 1b is being fixed to the axial direction in the state to which the predetermined bearing preload was provided with respect to the hub wheel 1 by the crimping part 1d formed by plastically deforming radially outward. . 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 and 5a facing the double row inner rolling surfaces 1a and 2a of the inner member 3 are integrally formed on the inner periphery. At least these double-row outer raceway surfaces 5a and 5a are hardened by induction hardening to a surface hardness of 58 to 64 HRC.

  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.

  In addition, although the double row angular contact ball bearing which used the rolling element 4 as the ball | bowl was illustrated here, the double row tapered roller bearing which uses a tapered roller for the rolling element may be sufficient not only in this. Here, the third-generation wheel bearing device is exemplified, but the present invention is not limited to this, and a second-generation structure in which the pair of inner rings 2 is press-fitted into the small-diameter step portion 1b of the hub wheel 1 may be used. .

  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 (or spline) 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. Then, the shaft portion 17 of the outer joint member 11 is fitted into the hub wheel 1 through serrations 1c and 17a until the end surface of the crimping portion 1d and the shoulder portion 16 abut each other, and the fixing nut 18 fastened to the male screw 17b. Thus, the hub wheel 1 and the outer joint member 11 are unitized so that torque can be transmitted and detachable.

  Here, in the present embodiment, the annular sensor holder 19 is attached to the end of the outer member 5 on the inner side. The inner seal 9 is attached to an opening of an annular space formed between the inner diameter of the sensor holder 19 and the outer diameter of the inner ring 2. As shown in an enlarged view in FIG. 2, the seal 9 includes an annular seal plate 20 and a slinger 21 having a substantially L-shaped cross section, and is disposed to face each other. The seal plate 20 is formed by insert-molding the sensor holder 19, and a cored bar 22 in which the exposed portion is fitted into the end of the outer member 5, and the cored bar 22 are integrally joined to each other by vulcanization adhesion or the like. It consists of a seal member 23. A pulsar ring 24 is fitted on the slinger 21.

  The core metal 22 is made of austenitic stainless steel (JIS standard SUS304, etc.), ferritic stainless steel (JIS standard SUS430, etc.), or a rust-proof cold rolled steel (JIS standard SPCC). A cylindrical portion 22a in which the sensor holder 19 is insert-molded, and an inner diameter portion 22b extending radially inward from the cylindrical portion 22a. A part of the cylindrical portion 22 a that is partially exposed is fitted into the end of the outer member 5. Thereby, when the sensor holder 19 is press-fitted into the outer member 5, the sensor holder 19 can be press-fitted with high accuracy without being twisted, and the tightness of the fitting portion can be increased and the air tightness of the fitting portion can be improved. . The cored bar 22 is preferably formed of a non-magnetic austenitic stainless steel plate so as not to adversely affect the sensing performance of the rotational speed sensor 27 described later.

  The seal member 23 is made of synthetic rubber such as NBR (acrylonitrile-butadiene rubber) and is integrally joined to the inner diameter portion 22b of the core metal 22 by vulcanization adhesion. The seal member 23 integrally includes a side lip 23a and a pair of radial lips 23b and 23c.

  The slinger 21 is an austenitic stainless steel plate (JIS standard SUS304, etc.), a ferritic stainless steel plate (JIS standard SUS430, etc.), or a rust-proof cold rolled steel plate (JIS standard SPCC system). Etc.) is formed by pressing, and has a cylindrical portion 21a that is press-fitted into the outer diameter of the inner ring 2, and a standing plate portion 21b that extends radially outward from the cylindrical portion 21a. And the outer edge of this standing board part 21b opposes the inner periphery of the sensor holder 19 via a slight radial clearance, and comprises the labyrinth seal.

  The pulsar ring 24 includes a core metal 25 press-fitted into the slinger 21 and a magnetic encoder 26 integrally joined to the outer diameter portion 25c of the core metal 25 by vulcanization adhesion. The core metal 25 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. A cylindrical inner diameter portion 25a whose cross section is formed into a substantially U-shape by processing and is press-fitted into the cylindrical portion 21a of the slinger 21, a standing plate portion 25b extending radially outward from the inner diameter portion 25a, and the standing plate portion 25b. It has an outer diameter portion 25c extending in the axial direction from the plate portion 25b. The side lip 23 a of the seal member 23 is slidably contacted with the standing plate portion 25 b of the core metal 25, and the pair of radial lips 23 b and 23 c are slidably contacted with the cylindrical portion 21 a of the slinger 21.

  The magnetic encoder 26 is made of a rubber magnet in which a magnetic powder such as ferrite is mixed in an elastomer such as rubber, and the 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. Thereby, coupled with the ferromagnetic cored bar 25, the output signal becomes stronger and stable detection accuracy can be ensured.

  By constructing such a seal 9, it is possible to prevent the pulsar ring 24 from being contaminated by dust or the like, and the rolling elements by the side lips 23 a and the radial lips 23 b, 23 c of the seal plate 20 slidably contacting the pulsar ring 24 and the slinger 21. 4 and 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 26, and to avoid a reduction in detection accuracy.

  The sensor holder 19 is made of a nonmagnetic resin material such as polyphenylene sulfide (PPS) 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 27 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 increasing the elastic modulus.

  With regard to the GF filling amount, if less than 10 wt%, the effect is not exhibited, and if the filling amount exceeds 45 wt%, the fibers in the molded product cause anisotropy and the density increases, resulting in dimensional stability. Is not preferable as the sensor holder 19 that is directly press-fitted into the outer member 5. In addition to PPS, the sensor holder 29 can exemplify 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.

  A rotational speed sensor 27 is embedded in the sensor holder 19, and the rotational speed sensor 27 faces the magnetic encoder 26 via a predetermined radial clearance (air gap). The rotation speed sensor 27 includes a magnetic detection element 27a, such as a Hall element, a magnetoresistive element (MR element), etc., whose characteristics change according to the direction of flow of magnetic flux, and an output waveform of the magnetic detection element 27a via a lead wire 27b. And IC 27c incorporating a waveform shaping circuit to be arranged.

  Here, the sensor holder 19 includes an annular holder main body 19a and a connector 19b integrally formed in a state protruding from a predetermined position on the circumference of the holder main body 19a. A rotational speed sensor 27 is embedded in the connector 19b, and the rotational speed sensor 27 and a harness 28 (see FIG. 4) connected to the electronic circuit of the vehicle body are connected. The end surface of the holder main body 19a of the sensor holder 19 and the inner side surface of the standing plate portion 21b of the slinger 21 are set to be substantially flush with each other. The term “substantially equal” as used herein means, for example, a design target value that is substantially free of steps, that is, a step caused by a processing error or the like should be allowed.

  In the present embodiment, as an example of the rotational speed detection apparatus, an active type rotational speed detection apparatus including the magnetic encoder 26 and the rotational speed sensor 27 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.

Next, a method of assembling the rotational speed detection device into the wheel bearing device will be described with reference to FIG.
The rotational speed detecting device is press-fitted with the wheel bearing device as a vertical type. First, the outer side surface 6c of the wheel mounting flange 6 is vertically lowered (lower side in the figure) and brought into contact with the pedestal 29. The wheel bearing device is placed in the state. By assembling in such a vertically placed state, the assembly process of the rotational speed detection device can be provided continuously on the assembly line of the wheel bearing device, the process layout can be simplified, and the axis of each component or jig The minds are easy to match and can be assembled accurately.

  Next, in a state where the press-fitting jig 31 is inserted into the guide jig 30 to form a unit, the sensor holder 19 including the seal plate 20 is externally fitted to the press-fitting jig 31 and held. Here, a notch 30a is formed in a portion of the guide jig 30 corresponding to the connector 19b, and a recess 31a is formed in a portion of the press-fitting jig 31 corresponding to the connector 19b. Units are made by matching the phase of the location 31a. The recess 31a of the press-fitting jig 31 is formed so as to be recessed from the end face more than the step between the connector 19b and the holder main body 19a. At the time of press-fitting, the press-fitting jig 31 presses the holder main body 19a and interferes with the connector 19b. Is preventing.

  Thereafter, the guide jig 30 is fitted onto the outer member 5, the support bar 32 is inserted into the mounting hole 5 c formed in the vehicle body mounting flange 5 b of the outer member 5, and the inner end face of the outer member 5 and The vehicle body mounting flange 5b is placed in contact with at least one of the side surfaces on the inner side. Here, the connector 19b of the sensor holder 19 constituting the rotational speed detecting device is set in advance so as to have a predetermined phase with respect to the mounting hole 5c of the vehicle body mounting flange 5b. The support bar 32 is press-fitted and fixed to the guide jig 30 so as to have the same pitch circle diameter and the same phase as those of the mounting holes 5c of the vehicle body mounting flange 5b. Next, by sliding the press-fitting jig 31 downward (in the direction of the arrow) along the guide jig 30, the sensor holder 19 is press-fitted and fixed to the end of the outer member 5. Finally, although not shown, the metal core 25 of the pulsar ring 24 is press-fitted into the slinger 21 and the slinger 21 is press-fitted into the outer diameter of the inner ring 2 to complete the assembly of the rotational speed detection device.

  In the present embodiment, the connector 19b of the sensor holder 19 is set to have a predetermined phase with respect to the mounting hole 5c of the vehicle body mounting flange 5b of the outer member 5, and has the same pitch as the mounting holes 5c of these vehicle body mounting flanges 5b. The support rod 32 is fixed to the guide jig 30 so as to have the same diameter as the circular diameter, and the press-fitting jig 31 is inserted into the guide jig 30 so that the phases of the notches 30a and the recesses 31a are matched. In a united state, the sensor holder 19 is fitted and held in the press-fitting jig 31, and the guide jig 30 is fitted on the inner side end of the outer member 5, and the support bar 32 is attached to the mounting hole. By sliding the press-fitting jig 31 holding the sensor holder 19 along the guide jig 30 with the step of inserting into the 5c and the axial center of the guide jig 30 and the outer member 5 being aligned. , Sensor A step of press-fitting the rudder 19 into the outer member 5, so that the connector 19 b of the sensor holder 19 can be press-fitted in a positioned state, and the sensor holder 19 is placed at a desired circumferential position with respect to the outer member 5. Can be worn. Therefore, after the wheel bearing device is assembled in the vehicle, it is possible to reliably prevent the harness from being short-circuited and disconnected, or conversely, the harness loosening and interfering with surrounding parts. It is possible to provide a wheel bearing device with a rotational speed detection device with improved accuracy and improved reliability.

  In addition, a recess 31a is formed in a portion corresponding to the connector 19b of the press-fitting jig 31 so as to be recessed from the end surface more than the step between the connector 19b and the holder main body 19a, and the flat end surface (pressing surface) is a sensor holder. Since it is possible to prevent misalignment and to fix the position with high accuracy without interfering with the connector 19b simply by abutting and pressing the holder body 19a, the fitting between the sensor holder 19 and the outer member 5 is possible. The airtightness of the joint can be improved.

  In the present embodiment, the end surface of the holder body 19a of the sensor holder 19 and the inner side surface of the upright plate portion 21b of the slinger 21 are set to be substantially flush with each other. By press-fitting into the slinger 21 and assembling the slinger 21 and the sensor holder 19 including the seal plate 20 in advance, the end face is formed flat as shown in FIG. 4 only by pressing the whole in the axial direction. The press-fitting jig 31 (shown by hatching in the figure) is pressed with both the holder body 19a and the slinger 21 of the sensor holder 19 in contact with each other, and the assembly man-hours can be reduced with high accuracy and easy rotation. The speed detection device can be assembled to the bearing portion.

  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 with a rotation speed detection device that is unitized by fitting a pulsar ring to a rotation side member such as a seal component.

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 principal part enlarged view of FIG. It is explanatory drawing which shows the assembly method of the rotational speed detection apparatus which concerns on this invention. It is the arrow line view seen from the IV-IV line 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. FIG. 6 is a side view of FIG. 5.

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 ... Mounting hole 6 ... Wheel mounting flange 6a ...・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ Hub bolt 6b ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ Base 6c ・ ・ ・ ・ ・ ・... Wheel mounting flange, outer side surface 7 ... Cage 8 ... Outer side Seal 9 ......... Inner side seal 10 ......... Constant velocity universal joint 11 ... outer joint member 12 ... joint inner ring 13 ... cage 14 ...・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ Torque transmission ball 15 ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ Mouse part 16 ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ Shoulder Part 17 ... Shaft part 17b ... Male thread 18 ...・ Fixing nut 19 ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ Sensor holder 19a ・················ Holder body 19b ······················································· ················ Slinger 21a, 22a ························································· ·········· Cores 22b, 25a ······ Inner diameter portion 23 ··········· Sealing member 23a・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ Side lip 23b, 23c ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ Radial lip 24 ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ Pulsar ring 25c ・ ・ ・ ・· · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · Magnetic encoder 27 27a ... ... Magnetic detection element 27b ..... Lead wire 27c ..... IC
28 ... Harness 29 ... Pedestal 30 ... Guide jig 30a ... Notch 31 ... Press-fit jig 31a ... ································································································・ ・ ・ ・ ・ ・ ・ ・ ・ ・ Outer member 51a ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ Outer rolling surface 51b ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・.... Body mounting flange 52 ... Ball 53 ... Inner member 54 ... .... Rotation speed detector 55 ..... Hub wheel 55a 56a ... Inner rolling surface 55b ... Small diameter step 55c ... Serration 56・ ・ ・ ・ ・ ・ ・ ・ ・ ・ Inner ring 56b ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ Small diameter part 57 ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ Wheel Mounting flange 58 ·········· Retainer 59 ·············· Outer seal 60 .... Inner side seal 61 ..... Magnetic sensor 62 ..... Sensor holder 63 ...・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ First seal ring 64 ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ Second seal ring 65 ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・··· Core 66 66 Lubricant member 66a ... Side lip 66b, 66c ... Radial lip 67 ... Slinger 67a ·························································. Pulsar ring 68a ... Inner diameter 68c ... Outer diameter 69 ...・ ・ Multipolar magnet rotor 70 ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ Connector 71 ・ ・ ・ ・ ・ ・ Press-fit jig δ1 ... Step difference δ2 between the holder body of the sensor holder and the connector ............ Step difference between the holder body of the sensor holder and the slinger

Claims (7)

An outer member integrally having a vehicle body mounting flange for mounting to a suspension device on the outer periphery, a mounting hole formed in the vehicle body mounting flange, and a double row outer rolling surface formed integrally 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;
An annular holder body that is attached to the inner side end of the outer member and is formed by injection molding synthetic resin, and a rotation speed sensor that is integrally formed with the holder body protruding at a predetermined circumferential position. A sensor holder comprising a connector embedded with
A pulsar ring having a detected portion that faces the rotational speed sensor via an air gap and has characteristics in the circumferential direction that change alternately and at equal intervals,
The seal on the inner side of the seal, the sensor holder is insert-molded, a metal core formed by pressing from a steel plate, and an annular seal plate made of a seal member integrally joined to the metal core,
A cylindrical portion disposed opposite to the seal plate and press-fitted into the outer diameter of the inner ring, and a slight radial clearance between the cylindrical portion and the inner periphery of the sensor holder. In a method of assembling a wheel bearing device with a rotational speed detection device comprising a standing plate portion facing each other, and a slinger having a cross section formed into an L shape by pressing from a steel plate,
The connector of the sensor holder is set so as to be in a predetermined phase with respect to the mounting hole of the vehicle body mounting flange, and the support bar is arranged so as to have the same pitch circle diameter and the same phase as the mounting holes of the vehicle body mounting flange. A guide jig that is fixed and has a notch extending in the axial direction at a portion corresponding to the connector, and a press-fitting jig that is slidably inserted into the guide jig,
A process of fitting and holding the sensor holder in the press-fitting jig in a state where the press-fitting jig is fitted into the guide jig to form a unit;
Bringing the guide jig into contact with the outer member and inserting the support rod into the mounting hole;
By sliding the press-fitting jig holding the sensor holder along the guide jig in a state where the axial centers of the guide jig and the outer member are aligned, the sensor holder is moved to the outer member. And a method of assembling the wheel bearing device with a rotational speed detecting device.   A recess is formed in a portion corresponding to the connector of the press-fitting jig so as to be recessed from the end surface more than the step between the connector and the holder body, and the phase of the recess and the notch of the guide jig are matched. 2. The method of assembling a wheel bearing device with a rotational speed detection device according to claim 1, wherein the press fitting jig is inserted into the guide jig in a state of being inserted into the unit.   The wheel bearing device with a rotation speed detecting device according to claim 1 or 2, wherein the wheel bearing device is mounted in a state in which the outer side surface of the wheel mounting flange is vertically contacted with a pedestal. Device assembly method.   In a state where the guide jig is externally fitted to the inner side end portion of the outer member and is in contact with at least one of the inner side end surface of the outer member and the inner side surface of the vehicle body mounting flange. The assembly method of the wheel bearing apparatus with a rotational speed detection apparatus in any one of Claims 1 thru | or 3 to mount.   The wheel bearing device with a rotational speed detection device according to any one of claims 1 to 4, wherein an end surface of a holder main body of the sensor holder and an inner side surface of the standing plate portion of the slinger are set to be flush with each other. Assembly method.   A core part of the seal plate is formed by insert molding the sensor holder, and a part of the exposed part is fitted into the end of the outer member, and extends radially inward from the cylindrical part. 6. The method of assembling a wheel bearing device with a rotational speed detection device according to claim 1, wherein the seal member is joined to the inner diameter portion.   A side lip and a radial lip are formed on the seal member, and the pulsar ring is a cylindrical inner diameter portion that is press-fitted into the cylindrical portion of the slinger, and a standing plate portion that extends radially outward from the inner diameter portion, and It has an outer diameter portion that extends in an axial direction from the standing plate portion and is integrally joined with a magnetic encoder, and is formed into a U-shaped cross section by pressing from a steel plate, and the side lip is a standing plate of the pulsar ring 7. The method of assembling a wheel bearing device with a rotational speed detecting device according to claim 1, wherein the radial lip is slidably contacted with a cylindrical portion of the slinger.

Images