JP5005565B2 - Wheel bearing device - Google Patents

Description

  The present invention relates to a wheel bearing device for rotatably supporting a wheel with respect to a vehicle body in a vehicle such as an automobile.

  The wheel bearing device has evolved from a structure in which a double row rolling bearing called a first generation is used alone to a second generation in which a vehicle body mounting flange is integrated with an outer member. The third generation in which the inner raceway is integrally formed on one of the double row rolling bearings on the outer periphery of the hub wheel having an integral, and the constant velocity universal joint is integrated with the hub wheel. A fourth generation type has been developed in which the other inner rolling surface of the double row rolling bearing is integrally formed on the outer periphery of the outer joint member constituting the joint.

  As shown in FIG. 5, a wheel bearing device called a third generation (for example, Patent Document 1) includes a hub wheel 102 having a flange 101 extending in the outer diameter direction, and an outer joint member 103 fixed to the hub wheel 102. The constant velocity universal joint 104 and the bearing structure 100 disposed on the outer peripheral side of the hub wheel 102 are provided.

  The constant velocity universal joint 104 includes an outer joint member 103, an inner joint member 108 disposed in the bowl-shaped portion 107 of the outer joint member 103, and the inner joint member 108 and the outer joint member 103. A ball 109 is provided, and a holder 110 that holds the ball 109. Further, a spline portion 111 is formed on the inner peripheral surface of the center hole of the inner joint member 108, and an end spline portion of a shaft (not shown) is inserted into the center hole, and the spline portion 111 on the inner joint member 108 side The spline portion on the shaft side is engaged.

  The hub wheel 102 has a cylindrical portion 113 and the flange 101, and a short cylindrical shape in which a wheel and a brake rotor (not shown) are mounted on the outer end surface 114 (end surface on the opposite joint side) of the flange 101. A pilot part 115 is provided in a protruding manner. The pilot portion 115 includes a large-diameter first portion 115a and a small-diameter second portion 115b. A brake rotor is externally fitted to the first portion 115a, and a wheel is externally fitted to the second portion 115b. Further, a bolt mounting hole 112 is provided in the flange 101 of the hub wheel 102, and a hub bolt for fixing the wheel and the brake rotor to the flange 101 is mounted in the bolt mounting hole 112.

  The bearing structure 100 includes an outer ring 105 and an inner ring 117 that is press-fitted into a stepped portion 116 that is provided at the end of the tubular portion 113 on the flange portion 107 side. A first inner raceway surface 118 is provided near the flange on the outer peripheral surface of the cylindrical portion 113 of the hub wheel 102, and a second inner raceway surface 119 is provided on the outer peripheral surface of the inner ring 117.

  The outer ring 105 is provided with two rows of outer raceway surfaces 120 and 121 on its inner periphery, and a flange (vehicle body mounting flange) 132 on its outer periphery. Then, the first outer raceway surface 120 of the outer member 105 and the first inner raceway surface 118 of the hub wheel 102 face each other, and the second outer raceway surface 121 of the outer member 105 and the raceway surface 119 of the inner ring 117 are formed. Opposing and the rolling element 122 is interposed between these.

  The shaft portion 123 of the outer joint member 103 is inserted into the tube portion 113 of the hub wheel 102. The shaft portion 123 has a threaded portion 124 formed at the end of the ridged portion, and a spline portion 125 is formed between the threaded portion 124 and the hooked portion 107. Further, a spline portion 126 is formed on the inner peripheral surface (inner diameter surface) of the tube portion 113 of the hub wheel 102, and when the shaft portion 123 is inserted into the tube portion 113 of the hub wheel 102, The spline portion 125 engages with the spline portion 126 on the hub wheel 102 side.

  Then, the nut member 127 is screwed onto the threaded portion 124 of the shaft portion 123 protruding from the cylindrical portion 113, and the hub wheel 102 and the outer joint member 103 are connected. At this time, the inner end surface (back surface) 128 of the nut member 127 and the outer end surface 129 of the cylindrical portion 113 are in contact with each other, and the end surface 130 on the shaft portion side of the hook-shaped portion 107 and the outer end surface 131 of the inner ring 117 are in contact with each other. That is, by tightening the nut member 127, the hub wheel 102 is sandwiched between the nut member 127 and the hook-shaped portion 107 via the inner ring 117.

  By the way, while supporting the wheel of a motor vehicle freely with respect to a suspension apparatus, the wheel bearing apparatus provided with the rotational speed detection apparatus which controls an anti-lock brake system (ABS) and detects the rotational speed of a wheel (patent document) 1) is generally known.

As shown in FIG. 6, the rotational speed detection device includes a cored bar 150 attached to the end 105 a on the inboard side of the outer ring 105 of the bearing structure 100, a resin mold 151 attached to the cored bar 150, And a rotational speed sensor 152 embedded in the resin mold 151.

  Further, a magnetic encoder 153 is attached to the seal member S that closes the opening on the inboard side of the bearing structure. That is, the magnetic encoder 153 includes a support ring 154 attached to an end portion on the inboard side of the inner ring 117 and an encoder body 155 attached to the support ring 154. The encoder body 155 is made of a rubber magnet having N and S poles alternately formed in the circumferential direction. Note that the side closer to the outside of the vehicle when assembled to the vehicle is referred to as the outboard side (left side in the drawing), and the side closer to the center is referred to as the inboard side (right side in the drawing).

The rotational speed sensor 152 is an IC that incorporates a magnetic detection element such as a Hall element, a magnetoresistive element (MR element), etc. that changes characteristics according to the flow direction of magnetic flux, and a waveform circuit that adjusts the output waveform of the magnetic detection element. It consists of. The magnetic encoder 153 is opposed through a predetermined air gap.
JP 2003-254985 A

  In the rotational speed detection device as shown in FIG. 6, the cored bar 150 includes a peripheral wall 156 that is press-fitted into the outer diameter surface of the end portion 105 a of the outer ring 105, and an inboard side end portion of the peripheral wall 156 in the inner diameter direction. This is an annular body having an L-shaped cross section composed of an extending side wall 157. The resin mold body 151 is attached to a part of the side wall 157.

  By the way, if such a rotational speed detection device is to be attached to the outer ring 105, the peripheral wall 156 of the cored bar 150 is press-fitted into the outer diameter surface of the end part 105a of the outer ring 105, so that the side wall 157 becomes the end face of the end part 105a. 158 is brought into contact (contact). In this case, it is desired that the resin mold body 151 is brought into contact with the resin mold body 151 so as not to be subjected to pressure input during press-fitting. This is to prevent the resin mold body 151 from being scratched, cracked, or cracked by applying pressure to the resin mold body 151.

  However, the side wall 157 may not be brought into close contact with the end surface 158 of the end portion 105a unless pressure is applied to the resin mold body 151. That is, the side wall 157 of the cored bar 150 is a flat ring body, and the resin mold body 151 is attached to a part of the flat plate ring body in the circumferential direction. If no pressure input is applied to the resin mold body 151, Even if other parts other than the resin mold body corresponding part are brought into close contact with the end surface 158 of the end part 105a, the resin mold body corresponding part is lifted up as shown in FIG. 7 (viewed from above). There may be a case where a gap 160 is formed between 158 and 158.

  Thus, if the gap 160 is formed, the side wall 157 cannot be brought into close contact with the end surface 158 of the end portion 105a. If the contact is not made in this way, the air gap formed between the rotational speed sensor 152 embedded in the resin mold 151 and the magnetic encoder 153 is different from the preset gap. That is, the air gap amount is set by determining the distance from the end surface 158 to the rotational speed sensor 152 with reference to the state in which the side wall 157 is in contact with the end surface 158 of the end portion 105a of the outer ring 105. For this reason, if the resin mold body corresponding part does not contact the end surface 158, the air gap to be formed does not become the set air gap.

  That is, the air gap between the rotational speed sensor 152 and the magnetic encoder 153 becomes larger than the set value, and an error occurs in the output characteristics of the rotational speed sensor 152, making it impossible to detect an accurate rotational speed.

  In view of the above problems, the present invention provides a wheel bearing device capable of reliably managing an air gap between a magnetic encoder and a rotation speed sensor and capable of detecting an accurate rotation speed. To do.

In the first wheel bearing device of the present invention, an outer member having a double row outer rolling surface formed on the inner periphery and an inner rolling surface facing the outer rolling surface of the outer member are formed on the outer periphery. A rotation speed device including a bearing structure portion having a formed inner member, and a rolling element that is rotatably accommodated between an outer rolling surface of the outer member and an inner rolling surface of the inner member. A wheel bearing device capable of detecting the rotational speed of a wheel by using a magnetic encoder mounted on an inner member side of the bearing structure portion and an outer member side of the bearing structure portion. A sensor component, and the sensor component is press-fitted and fixed to an end of the outer member of the bearing structure, a resin part attached to the core, and embedded in the resin part A rotational speed sensor facing the magnetic encoder via an air gap, and a core Than said resin portion provided fitting force applying portion which projects in the circumferential direction opposite to the press-fitting side, by mounting the rotational speed device, the press-fitting force applying portion opening on the inboard side of the bearing structure in The labyrinth seal which closes up is comprised.

  According to the first wheel bearing device of the present invention, when the core metal is press-fitted into the end portion of the outer member, the pressure input is applied to the pressure input application portion of the core metal so that the core metal is moved outward. It can be press-fitted into the end of the member. At this time, since the pressure input applying portion protrudes along the circumferential direction, the pressure input can be applied substantially uniformly over the entire circumference. The metal core can be brought into close contact with the metal core pressure contact surface of the outer member.

  The pressure input application portion preferably has a flange portion extending in the radial direction. In what has such a collar part, the stable pressure input can be provided to a pressure input provision part.

  Even if a bearing device for a wheel is provided with a pair of inner rings whose abutting surfaces are abutted as inner members and an outer ring as an outer member disposed on the outer peripheral side of the inner ring, An inner rolling surface that faces the outer rolling surface of the outer member is formed on the outer diameter surface, and a stepped portion is formed on the inboard side of the outer diameter surface of the hub wheel. Even if the inner ring constituting the inner member having the inner rolling surface facing the outer rolling surface is formed on the outer periphery, the first outer side of the outer member is fitted to the outer diameter surface of the hub ring. A second inner rolling surface is formed in which a first inner rolling surface facing the rolling surface is formed, and an outer diameter surface of the outer joint member of the constant velocity universal joint is opposed to a second outer rolling surface of the outer member. A surface may be formed. Here, the side closer to the outside of the vehicle when assembled to the vehicle is referred to as the outboard side (left side in the drawing), and the side closer to the center is referred to as the inboard side (right side in the drawing).

  In the wheel bearing device of the present invention, when the core metal is press-fitted into the end portion of the outer member, the pressure input is substantially uniform over the entire circumference in the circumferential direction by applying a pressure input to the pressure input application portion of the core metal. The core metal can be brought into close contact with the core metal pressure contact surface of the outer member. For this reason, the air gap between the rotation speed sensor embedded in the resin portion and the magnetic encoder can be reliably managed, and an accurate rotation speed can be detected. In addition, since no pressure is applied to the resin portion, no external force acts on the resin portion, and it is possible to prevent the resin portion from being scratched, cracked, or cracked.

  In the case where the pressure input applying portion has a flange portion extending in the radial direction, a stable pressure input can be applied to the pressure input applying portion, and the management of the air gap between the magnetic encoder and the rotation speed sensor can be performed more reliably. It can be carried out.

  By forming the labyrinth seal in which the pressure input applying portion closes the opening on the inboard side of the bearing structure portion, foreign matter enters the bearing structure portion from the inboard side and grease or the like flows out from the bearing structure portion. Can be prevented. For this reason, while being able to function a bearing structure part with high precision over a long period of time, the bad influence by the grease from a bearing structure part can be prevented.

  The wheel bearing device according to the present invention includes a so-called second generation having a vehicle body mounting flange integrally with an outer member, instead of a single row rolling bearing referred to as a first generation. What is called the third generation, in which the inner rolling surface is integrally formed on one of the double row rolling bearings on the outer periphery of the hub ring integrally having the mounting flange, the inner rolling surface is formed on the outer joint member of the constant velocity universal joint. It can be adopted for the so-called fourth generation formed and has excellent versatility.

  Hereinafter, embodiments of the present invention will be described with reference to FIGS. FIG. 1 shows a wheel bearing device (drive wheel bearing device) according to the first embodiment. This wheel bearing device is composed of a hub wheel 1, a double-row rolling bearing (bearing structure portion) 2, and a constant velocity freely. The joint 3 is integrated.

  The constant velocity universal joint 3 includes a plurality of outer rings 5 serving as outer joint members, an inner ring 6 serving as an inner joint member disposed on the inner side of the outer ring 5, and a plurality of torque transmissions interposed between the outer ring 5 and the inner ring 6. The ball 7 and the cage 8 that is interposed between the outer ring 5 and the inner ring 6 and holds the ball 7 are configured as main members. The inner ring 6 is spline-fitted by press-fitting an end of a shaft (not shown) into the shaft hole inner diameter 6a and is coupled to the shaft so that torque can be transmitted.

  The outer ring 5 is composed of a mouse part 11 and a stem part (shaft part) 12. The mouse part 11 has a bowl shape opened at one end, and a plurality of track grooves 14 extending in the axial direction are circumferentially formed on the inner spherical surface 13 thereof. It is formed at equal intervals in the direction. The track groove 14 extends to the open end of the mouse portion 11. In the inner ring 6, a plurality of track grooves 16 extending in the axial direction are formed on the outer spherical surface 15 at equal intervals in the circumferential direction.

  The track groove 14 of the outer ring 5 and the track groove 16 of the inner ring 6 make a pair, and one ball 7 as a torque transmitting element can roll on each ball track constituted by the pair of track grooves 14 and 16. It is incorporated. The ball 7 is interposed between the track groove 14 of the outer ring 5 and the track groove 16 of the inner ring 6 to transmit torque. The constant velocity universal joint in this case is a Zepper type, but may be another constant velocity universal joint such as an undercut free type having a straight straight portion at the bottom of each track groove.

  The hub wheel 1 includes a cylindrical portion 20 and a flange 21 provided at an end of the cylindrical portion 20 on the side opposite to the joint. A short cylindrical pilot portion 45 on which a wheel and a brake rotor (not shown) are mounted is projected from an end face on the outboard side of the hub wheel 1. The pilot portion 45 includes a large-diameter first portion 45a and a small-diameter second portion 45b. A brake rotor is externally fitted to the first portion 45a, and a wheel is externally fitted to the second portion 45b. A bolt mounting hole 32 is provided in the flange 21 of the hub wheel 1, and a hub bolt 33 for fixing the wheel and the brake rotor to the flange 21 is mounted in the bolt mounting hole 32. The side closer to the outside of the vehicle in the state assembled to the vehicle is called an outboard side (left side in the drawing), and the side closer to the center is called an inboard side (right side in the drawing).

  Further, the shaft portion 12 of the outer ring 5 is inserted into the hole portion 22 of the cylindrical portion 20 of the hub wheel 1. The shaft portion 12 has a screw portion 40 formed at the end of the anti-mouse portion, and a spline portion 41 is formed between the screw portion 40 and the mouse portion 11. A spline portion 42 is formed on the inner peripheral surface (inner diameter surface) of the cylindrical portion 20 of the hub wheel 1. When the shaft portion 12 is inserted into the cylindrical portion 20 of the hub wheel 1, The spline portion 41 engages with the spline portion 42 on the hub wheel 1 side.

  The rolling bearing 2 is provided with an outer ring 25 as an outer member in which double-row outer rolling surfaces 26 and 27 are formed on the inner periphery, and a step provided on an inboard side end portion of the outer diameter surface of the cylindrical portion 20. And an inner ring 24 as an inner member press-fitted into the attaching portion 23. The inner ring 24 forms an inner rolling surface 29 on the inboard side of the inner member.

  An inner rolling surface 28 corresponding to the outer rolling surface 26 of the outer ring 25 is formed on the outer diameter surface of the cylindrical portion 20, and an inner rolling surface corresponding to the outer rolling surface 27 of the outer ring 25 is formed on the outer diameter surface of the inner ring 24. 29 is formed. And, between the outer rolling surface 26 of the outer ring 25 and the inner rolling surface 28 of the cylindrical portion 20, between the outer rolling surface 27 of the outer ring 25 and the inner rolling surface 29 of the inner ring 24, The rolling elements 30 held in this manner are accommodated so as to be freely rollable.

  A vehicle body mounting flange 50 having a screw hole 50a is provided on the outer diameter surface of the outer ring 25, and the outer diameter surface on the inboard side of the vehicle body mounting flange 50 is fitted into a knuckle (not shown) with a predetermined clearance. Knuckle pilot section 25a.

  Sealing members S1 and S2 made of lip seals are attached to both openings of the rolling bearing 2. The outboard-side seal member S1 includes a reinforcing ring 51 and a lip portion 52 attached to the reinforcing ring 51. The lip portion 52 includes a radial lip 52a and a side lip 52b.

  Further, as shown in FIG. 2, the inboard-side seal member S <b> 2 includes seal plates 53 and 54 having an L-shaped cross section, and a seal portion 55 attached to one seal plate 53. That is, the seal plate 53 includes a cylindrical portion 53 a and a side wall portion 53 b extending from the end on the outboard side of the cylindrical portion 53 a toward the inner diameter side. The cylindrical portion 53 a is an end on the inboard side of the inner diameter surface of the outer ring 25. It is fitted to the part. The seal plate 54 includes a cylindrical portion 54 a and a side wall portion 54 b extending from the end on the inboard side of the cylindrical portion 54 a to the outer diameter side, and the cylindrical portion 54 a is fitted to the outer diameter surface of the inner ring 24. . The seal portion 55 includes a radial lip 55a and a side lip 55b.

  Next, a method for assembling the wheel bearing device will be described. The shaft portion 12 is inserted into the tube portion 20 of the hub wheel 1 to engage the spline portion 41 on the shaft portion 12 side with the spline portion 42 on the hub wheel 1 side. In this state, the nut member 43 is screwed onto the screw portion 40 protruding from the tube portion 20 of the hub wheel 1 to the outboard side.

  As a result, the seat portion 43 a of the nut member 43 abuts on the end surface on the outboard side of the hub wheel 1, and the bottom wall outer surface 11 a of the mouth portion 11 abuts on the end surface 24 b of the inner ring 24. For this reason, the end surface 24a of the inner ring 24 abuts on the end surface 23a of the stepped portion 23, and preload can be applied to the double row rolling bearing.

  By the way, this wheel bearing device is provided with a rotational speed detection device 60. As shown in FIG. 2, the rotational speed detecting device 60 includes a magnetic encoder 61 mounted on the inner ring 24 side of the double row rolling bearing 2 and a sensor component mounted on the outer ring 25 side of the double row rolling bearing 2. 62.

  The magnetic encoder 61 is made of, for example, a rubber magnet made of rubber or other elastomer mixed with magnetic powder such as ferrite, and is attached to the outer surface of the side wall portion 54b of the seal plate 54 of the seal member S2. Yes. The magnetic encoder 61 has N and S poles alternately formed in the circumferential direction.

  The sensor component 62 includes a cored bar 63 that is press-fitted and fixed to the end of the outer ring 25 of the double row rolling bearing 2, a resin part 64 attached to the cored bar 63, and embedded in the resin part 64. A rotation speed sensor (not shown) that faces the magnetic encoder via an air gap is included.

  The core metal 63 includes a cylindrical main body cylinder part 63a, a flat plate ring-shaped inner diameter wall part 63b extending from the main body cylinder part 63a toward the inner diameter side, and a superposition part 63c that connects the main body cylinder part 63a and the inner diameter wall part 63b. Is provided. The overlapping portion 63c is press-fitted into the end portion of the outer ring 25 on the inboard side in an outer fitting manner. Further, the inner diameter wall portion 63 b has an outer diameter portion 66 and an inner diameter portion 67, and the inner diameter portion 67 is arranged on the inboard side with respect to the outer diameter portion 66. And the ring-shaped collar part 71 extended in an outer-diameter direction is formed in the inboard side edge of the main body cylinder part 63a. The flange portion 71 constitutes a pressure input applying portion 72 that protrudes along the circumferential direction from the resin portion 64 to the counter press-fit side.

The resin portion 64 is formed of a block body having a square cross section, and is provided on a part of the inner wall 63b in the circumferential direction as shown in FIG. That is, the outer diameter surface 64a of the resin portion 64 is in close contact with a part of the inner diameter surface of the main body cylinder portion 63a. The resin portion 64 is made of synthetic resin such as PA (polyamide), for example, and is integrally molded on the side wall 63b of the core metal 63.

  The rotational speed sensor includes a magnetic detection element that changes characteristics according to the flow direction of magnetic flux, such as a Hall element and a magnetoresistive element (MR element), and an IC in which a waveform circuit that adjusts the output waveform of the magnetic detection element is incorporated. Consists of. Further, from the resin portion 64, a harness 70 is pulled out that sends a signal from the rotation speed sensor to a control means (not shown).

  In this rotational speed detection device 60, the core metal 63 is press-fitted into the end portion on the inboard side of the outer ring 25. At the time of this press-fitting, as shown by an arrow F in FIG. On the other hand, a pressure input is given.

  In the rotational speed detection device 60 configured as described above, when the magnetic encoder 61 rotates together with the inner ring 24 as the wheels (not shown) rotate, the output of the rotational speed sensor facing the magnetic encoder 61 changes. Since the frequency at which the output of the rotational speed sensor changes is proportional to the rotational speed of the wheel, the output of the rotational speed sensor is input to the control means (not shown) via the harness 70 to control the ABS. Become.

  For this reason, in order to perform highly accurate control, the magnetic encoder 61 and the rotational speed sensor need to face each other through a predetermined air gap. Therefore, when the cored bar 63 is press-fitted into the end part on the inboard side of the outer ring 25, the air gap is defined by bringing the outer diameter part 66 of the cored bar 63 into contact with the end surface 25 b of the outer ring 25. Can do.

  However, when press-fitting, a pressing force cannot be applied to the resin portion 64 in order to prevent the resin portion 64 from being scratched, cracked, or cracked. For this reason, even if a portion other than the resin portion corresponding portion of the core metal 63 is brought into contact with the end surface 25b of the outer ring 25, the resin portion corresponding portion of the core metal 63 is lifted and does not contact the end surface 25b of the outer ring 25. In some cases, the air gap to be formed becomes larger than a preset air gap.

  Therefore, in the present invention, the pressure input application portion 72 that protrudes in the circumferential direction from the resin portion 64 to the counter press-fit side is configured. Accordingly, even if no pressure input is applied to the resin portion 64, the pressure input is applied to the pressure input applying portion 72 as shown in FIG.

  Further, the pilot portion 25a of the outer ring 25 is fitted to the inner diameter surface 80 of the knuckle N on the vehicle body side to a predetermined clearance. For this reason, the labyrinth that seals the gap between the inner diameter surface 80 of the knuckle N and the outer diameter surface of the outer ring 11 of the constant velocity universal joint 3 with the end portion on the inboard side of the core 63 of the rotational speed detection device 60. It constitutes a seal.

  In the present invention, when the core metal 63 is press-fitted into the end portion of the outer member, the pressure input can be applied substantially uniformly over the entire circumference in the circumferential direction by applying a pressure input to the pressure input application portion 72 of the core metal 63. The core metal 63 can be brought into close contact with the core metal pressure contact surface of the outer member. For this reason, the air gap between the magnetic encoder 61 embedded in the resin portion 64 and the rotation speed sensor can be reliably managed, and an accurate rotation speed can be detected. In addition, since no pressure input is applied to the resin portion 64, no external force acts on the resin portion 64, and it is possible to prevent the resin portion from being scratched, cracked, or cracked.

  Since the pressure input imparting portion 72 has the flange portion 71 extending in the radial direction, a stable pressure input can be imparted to the pressure input imparting portion, and the air gap between the magnetic encoder 61 and the rotation speed sensor can be more managed. It can be done reliably.

  By forming the labyrinth seal in which the pressure input applying portion 72 closes the opening on the inboard side of the double row rolling bearing 2, foreign matter intrusion into the double row rolling bearing 2 from the inboard side or double row It is possible to prevent the leakage of grease from the rolling bearing. For this reason, the double row rolling bearing 2 can be made to function with high accuracy over a long period of time, and adverse effects due to the grease from the double row rolling bearing 2 can be prevented.

  By the way, in the said embodiment, while the inner side rolling surface which the outer side rolling surface of the outer ring | wheel 25 opposes is formed in the outer diameter surface of the hub ring 1, a step part is formed in the inboard side of the outer diameter surface of the hub ring 1. 23 is a so-called third-generation wheel bearing device in which an inner ring 24 having an inner rolling surface 29 formed on the outer periphery and facing the outer rolling surface 27 is fitted to the stepped portion 23. However, other generation wheel bearing devices may be used. That is, it may be a so-called first generation or second generation wheel bearing device in which a pair of inner rings are mounted in a state where the abutting surfaces are abutted. In addition, a first inner rolling surface that faces the first outer rolling surface of the outer ring is formed on the outer diameter surface of the hub wheel, and the outer ring of the outer ring is formed on the outer diameter surface of the outer joint member of the constant velocity universal joint. It may be a so-called fourth-generation wheel bearing device in which a second inner rolling surface facing the two outer rolling surfaces is formed.

  Thus, the wheel bearing device of the present invention can be applied to all generations of wheel bearing devices, is excellent in versatility, and can detect the rotational speed with high accuracy for each generation of wheel bearing devices.

  As described above, the embodiment of the present invention has been described. However, the present invention is not limited to the above embodiment, and various modifications are possible. For example, in the wheel bearing device shown in FIG. The rolling element as the torque transmission means of the bearing 2 is constituted by the ball 30, but a tapered roller may be used. As the sensor of the rotational speed detection device, a so-called active sensor is used in the above-described embodiment. However, a so-called passive sensor in which an encoder is formed of a magnetic ring having an uneven shape may be used.

  Moreover, in the said embodiment, although the collar part 71 which comprises the pressure input provision part 72 of the metal core 63 protrudes from the inboard side edge of the main body cylinder part 63a to the outer diameter side, it protrudes to the inner diameter side. There may be. Further, the collar portion 71 may not be ring-shaped but may be a plurality of small pieces arranged at a predetermined pitch along the circumferential direction. In short, it is only necessary to apply a substantially uniform pressure input along the circumferential direction to the cored bar 63 without applying a pressure input to the resin portion 64.

It is sectional drawing of the wheel bearing apparatus which shows embodiment of this invention. It is a principal part expanded sectional view of the said wheel bearing apparatus. It is a principal part side view of the said wheel bearing apparatus. It is sectional drawing which shows the assembly | attachment method of the rotational speed detection apparatus of the said wheel bearing apparatus. It is a longitudinal cross-sectional view of the conventional wheel bearing apparatus. It is sectional drawing of the conventional rotational speed detection apparatus. It is a simplified sectional view of a conventional rotational speed detection device.

Explanation of symbols

24 Inner ring 25 Outer ring 26, 27 Outer rolling surface 28, 29 Inner rolling surface 30 Rolling body 60 Rotational speed detection device 61 Magnetic encoder 62 Sensor component 63 Core metal 64 Resin part 71 Kite part 72 Pressure input giving part

Claims (5)

An outer member having a double row outer rolling surface formed on the inner periphery, an inner member having an inner rolling surface opposed to the outer rolling surface of the outer member on the outer periphery, and the outer side of the outer member For a wheel having a bearing structure portion having a rolling element that is rotatably accommodated between the rolling surface and the inner rolling surface of the inner member, and capable of detecting the rotational speed of the wheel by a rotational speed device A bearing device,
The rotational speed device includes a magnetic encoder mounted on the inner member side of the bearing structure portion, and a sensor component portion mounted on the outer member side of the bearing structure portion, and the sensor component portion includes the bearing structure portion. A metal core press-fitted to the end of the outer member, a resin portion attached to the metal core, and a rotational speed sensor embedded in the resin portion and facing the magnetic encoder through an air gap. And providing a pressure input imparting portion that protrudes along the circumferential direction from the resin portion toward the counter press-fit side of the resin portion, and mounting the rotational speed device so that the pressure input imparting portion is inserted into the bearing structure portion. A wheel bearing device comprising a labyrinth seal that closes an opening on a board side .   The wheel bearing device according to claim 1, wherein the pressure input imparting portion has a flange portion extending in a radial direction. 3. A method according to claim 1 , further comprising: a pair of inner rings whose butting surfaces are abutted as inner members; and an outer ring as an outer member disposed on an outer peripheral side of the inner ring . 2. A wheel bearing device according to item 1. A wheel bearing device in which a hub wheel, a double-row rolling bearing, and a constant velocity universal joint are unitized, and an inner rolling surface in which an outer rolling surface of an outer member is opposed to an outer diameter surface of the hub wheel. An inward member in which a stepped portion is formed on the inboard side of the outer diameter surface of the hub wheel, and an inner rolling surface facing the outer rolling surface is formed on the outer periphery of the stepped portion. The wheel bearing device according to any one of claims 1 to 3, wherein an inner ring constituting the inner ring is fitted . A wheel bearing device in which a hub wheel, a double-row rolling bearing, and a constant velocity universal joint are unitized, and a first outer rolling surface of an outer member is opposed to an outer diameter surface of the hub wheel . An inner rolling surface is formed, and a second inner rolling surface is formed on the outer diameter surface of the outer joint member of the constant velocity universal joint so as to face the second outer rolling surface of the outer member. The wheel bearing device according to any one of claims 1 to 3.

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