JP5160252B2 - 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. 6, a wheel bearing device called 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 notch stepped portion 116 that is provided at the end of the tubular portion 113 on the saddle-shaped 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. 7, the rotational speed detection device includes a cored bar 150 attached to an end 105a 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. 7, the cored bar 150 has a peripheral wall 156 that is press-fitted into the outer diameter surface of the end portion 105a of the outer ring 105, and an inner board 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, the resin mold body 151 is not given press input when 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 when a part other than the resin mold body corresponding part is brought into close contact with the end surface 158 of the end part 105a, the resin mold body corresponding part is lifted and a gap 160 is formed between the end surface 158 as shown in FIG. There is.

  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.

  The first wheel bearing device of the present invention has at least one outer ring in which a double row outer rolling surface is formed on the inner periphery, and an inner rolling surface facing the outer rolling surface of the outer ring on the outer periphery. And detecting the rotational speed of the wheel by a rotational speed device, including a bearing structure having two inner rings and a rolling element that is rotatably accommodated between an outer rolling surface of the outer ring and an inner rolling surface of the inner ring. The rotation speed device includes a magnetic encoder mounted on the inner ring side of the bearing structure portion, and a sensor component portion mounted on the outer ring side of the bearing structure portion. The component part is a core metal that is press-fitted and fixed to the end of the outer ring of the bearing structure part, a resin part that is attached to the core metal, and is embedded in the resin part so as to face the magnetic encoder via an air gap. A rotation speed sensor and a resin part corresponding to the core metal Body is one that projects to the core metal pressing surface side of the outer ring than the other sites.

  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 ring, by applying pressure input to the other part of the core metal, this other part is made the core of the outer ring. It will be in close contact with the gold pressure contact surface. At this time, since the entire resin portion corresponding portion in the core metal protrudes toward the core metal pressure contact surface side of the outer ring from other portions, the resin can be obtained by bringing the other portion into close contact with the core metal pressure contact surface of the outer ring. Without applying pressure input to the portion, the protruding portion (resin portion corresponding portion) protruding toward the core metal pressure contact surface side of the outer ring can be brought into close contact with the core metal pressure contact surface of the outer ring.

  In the second wheel bearing device of the present invention, the sensor corresponding part of the resin part corresponding part of the core metal protrudes to the core metal pressure contact surface side of the outer ring. In this case, the sensor-corresponding portion of the resin portion corresponding portion is not subjected to pressure input to the resin portion by trying to bring other portions into close contact with the core ring pressure-contact surface of the outer ring. Can be in close contact with.

  It is preferable that 0 mm <A <0.5 mm, where A is the protruding amount of the protruding portion of the outer ring toward the core metal pressure contact surface side.

  As a wheel bearing device, a pair of inner rings may be mounted in a state where the abutting surfaces are abutted. An inner rolling surface is formed on the outer diameter surface of the hub wheel so that the outer rolling surface of the outer ring faces the outer ring surface, and a stepped portion is formed on the inboard side of the outer diameter surface of the hub wheel. The outer ring may be fitted with an inner ring having an inner rolling surface facing the outer rolling surface. Further, the wheel bearing device is a unit in which the hub wheel, the double row rolling bearing and the constant velocity universal joint are unitized, and the first outer rolling surface of the outer ring faces the outer diameter surface of the hub wheel. Even if the inner rolling surface is formed and the outer diameter surface of the outer joint member of the constant velocity universal joint is formed with the second inner rolling surface facing the second outer rolling surface of the outer ring. Good. 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).

  It is preferable that a labyrinth seal disposed on the outer side of the seal member that closes the opening on the inboard side of the bearing structure portion is configured by mounting the sensor constituent portion.

  In the first wheel bearing device of the present invention, the protruding portion protruding toward the core metal pressure contact surface side of the outer ring can be brought into close contact with the core metal pressure contact surface of the outer ring without applying pressure input to the resin portion. 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.

  If the sensor-corresponding portion of the resin portion corresponding portion of the core metal protrudes toward the core ring pressure contact surface side of the outer ring, the air gap can be set more stably. Further, when the protrusion amount of the protrusion of the outer ring toward the core metal pressure contact surface side is A, if 0 mm <A <0.5 mm, the closeness of the core metal protrusion to the core metal pressure contact surface of the outer ring Improvements can be made. That is, by setting 0 mm <A <0.5 mm, when press-fitting the cored bar into the end of the outer ring, if pressure is applied to other parts that are not the resin part corresponding parts, the resin part protrudes. The corresponding portion first comes into contact with the core metal pressure contact surface of the outer ring, and a predetermined air gap can be stably secured. If A is 0, the projecting portion cannot be secured, and if A exceeds 0.5 mm, the projecting amount of the projecting portion increases, and the core metal can secure the press-fit amount that can obtain a stable press input. Disappear.

  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. It can be used in what is called a third generation in which an inner rolling surface is integrally formed on one of the double row rolling bearings on the outer periphery of the hub wheel integrally having the mounting flange, and is excellent in versatility.

  By configuring the labyrinth seal, in addition to the sealing function of the seal member, this labyrinth seal can exhibit a more accurate sealing function.

  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 inner peripheral surface (inner diameter surface) 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 formed on the outer periphery of the shaft portion 12. 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 press-fitted into an outer ring 25 in which double row outer rolling surfaces 26 and 27 are formed on the inner periphery, and a stepped portion 23 provided at an end on the inboard side of the outer diameter surface of the cylindrical portion 20. The inner ring 24 is provided.

  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. 3, 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 24 a of the inner ring 24 abuts on the end surface 23 a of the stepped portion 23, and preload can be applied to the double row rolling bearing (bearing structure portion) 2.

  By the way, this wheel bearing device is provided with a rotational speed detection device 60. The rotational speed detector 60 is mounted on the inner ring 24 side of the double row rolling bearing (bearing structure portion) 2 and on the outer ring 25 side of the double row rolling bearing (bearing structure portion) 2. A sensor configuration unit 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 metal core 63 that is press-fitted and fixed to the end of the outer ring 25 of the double row rolling bearing (bearing structure) 2, a resin part 64 that is attached to the metal core 63, and the resin part 64. And a rotation speed sensor 65 which is embedded in the magnetic encoder and faces the magnetic encoder through an air gap.

  The core metal 63 includes a short cylindrical portion 63a and a ring-shaped side wall 63b extending in the inner diameter direction from the end portion on the inboard side of the short cylindrical portion 63a. The side wall 63 b has an outer diameter portion 66 and an inner diameter portion 67, and the inner diameter portion 67 is disposed on the inboard side with respect to the outer diameter portion 66.

  The resin portion 64 is formed of a block body having a square cross section, and is provided in a part of the side wall 63b in the circumferential direction as shown in FIG. 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 rotation speed sensor 65 is an IC incorporating 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. Further, from the resin portion 64, a harness 70 is pulled out that sends a signal from the rotation speed sensor 65 to a control means (not shown).

  In this case, as shown in FIG. 4 (a diagram in which the core metal 63 and the resin portion 64 are simplified), substantially the entire resin portion corresponding portion 68 of the core metal 63 is closer to the core metal pressure contact surface side of the outer ring 25 than the other portions. Protruding. That is, a part of the cored bar 63 to which the resin part 64 is attached bulges toward the outboard side to form the protruding part 71. In this case, the projecting portion 71 can be configured by forming the recessed portion 72 on the end surface of the cored bar 63 on the inboard side. When the protrusion amount of the protrusion 71 is A, 0 mm <A <0.5 mm. In this case, the portion where the protruding portion 71 is provided is the outer diameter portion 66 of the side wall 63b.

  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 65 changes when facing the magnetic encoder 61. Since the frequency at which the output of the rotational speed sensor 65 changes is proportional to the rotational speed of the wheel, the ABS is controlled by inputting the output signal of the rotational speed sensor 65 to the control means (not shown) via the harness 70. It will be.

  For this reason, in order to perform highly accurate control, the magnetic encoder 61 and the rotational speed sensor 65 must face each other through a predetermined air gap. Therefore, when the core metal 63 is press-fitted into the end of the outer ring 25 on the inboard side, the outer diameter portion 66 of the core metal 63 abuts on the core metal pressure contact surface 69 of the outer ring 25 as shown in FIG. By doing so, the air gap can be defined.

  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 68 of the core metal 63 is brought into contact with the core metal pressure contact surface 69 of the outer ring 25, the resin portion corresponding portion 68 of the core metal 63 is lifted and the core of the outer ring 25. There is a case where the air gap is not in contact with the gold pressure contact surface 69 and the formed air gap is larger than a preset air gap.

  Therefore, in the present invention, substantially the entire resin portion corresponding portion 68 of the core metal 63 protrudes toward the core metal pressure contact surface 69 side of the outer ring 25 from other portions. As a result, even if no pressure is applied to the resin portion 64, the resin portion corresponding portion 68 of the core metal 63 is in contact with the core metal pressure contact surface 69 of the outer ring 25, and the air gap formed is predetermined. The air gap is set.

  The seal member S2 and the sensor component 62 of the rotational speed detection device 60 constitute a labyrinth seal on the inboard side with respect to the seal member S2. That is, the magnetic encoder 61 and the cored bar 63 are opposed to each other with a minute gap, so that a labyrinth seal can be configured. A labyrinth seal can also be configured between the inner diameter portion 67 of the core metal 63 and the mouse portion 11.

  In the present invention, the protruding portion 71 protruding toward the core metal pressure contact surface 69 side of the outer ring 25 can be brought into close contact with the core metal pressure contact surface 69 of the outer ring 25 without applying pressure input to the resin portion 64. For this reason, the air gap between the rotation speed sensor 65 embedded in the resin portion 64 and the magnetic encoder 61 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 64 from being scratched, cracked, or cracked.

  Further, when the protrusion amount of the protrusion 71 toward the core metal pressure contact surface 69 side of the outer ring 25 is A, if 0 mm <A <0.5 mm, the metal core pressure contact surface of the outer ring 25 of the metal core protrusion 71 will be described. The closeness to 69 can be improved. That is, by setting 0 mm <A <0.5 mm, when press-fitting the cored bar into the end of the outer ring 25, if pressure is applied to other parts that are not the resin part corresponding part 68, the core bar protrudes. The resin portion corresponding portion 68 first comes into contact with the core metal pressure contact surface of the outer ring, and a predetermined air gap can be secured stably. If A is 0, the projecting portion cannot be secured, and if A exceeds 0.5 mm, the projecting amount of the projecting portion increases, and the core metal can secure the press-fit amount that can obtain a stable press input. Disappear.

  By configuring the labyrinth seal, in addition to the sealing function of the seal member S2, the labyrinth seal can exhibit a more accurate sealing function.

  In FIG. 4, the resin portion 64 includes a main body portion 64 a that is larger than the concave portion 72 of the core metal 63 and a convex portion 64 b that fits into the concave portion 72, but FIG. As shown in FIG. 3, the resin portion 64 may include a main body portion 64a that is smaller than the concave portion 72 of the core metal 63 and an outer flange portion 64c that fits into the opening-side inclined portion 72a of the concave portion 72. Good.

  Moreover, as the protrusion part 71 provided in the metal core 63, as shown in FIG.5 (b), you may provide only in the site | part corresponding to the rotational speed sensor 65. FIG. In this case, the protrusion 71 can be formed by forming the small concave recess 73 on the end surface of the cored bar 63 on the inboard side. For this reason, the resin part 64 is provided with the main-body part 64a and the small convex ridge part 64d fitted to the small recessed part 73. FIG.

  As shown in FIG. 5 (c), in addition to the small recesses 73, other small recesses 73 a and 73 b may be provided in other parts of the resin portion corresponding part 68. As shown in FIGS. 5B and 5C, the portion corresponding to the rotation speed sensor 65 is a portion that coincides with the radial direction when the inner diameter side is viewed from the outer diameter side.

  Thus, even when the sensor corresponding portion of the resin portion corresponding portion 68 of the core metal 63 protrudes toward the core metal pressure contact surface 69 side of the outer ring 25, the air gap is stably set to the set value. be able to.

  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. In the fourth generation, a part of the outer diameter surface of the outer joint member can be called an inner ring having a rolling surface on the inboard side.

  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.

  When the protrusion amount of the protruding portion 71 toward the core metal pressure contact surface 69 side of the outer ring 25 is A, when setting 0 mm <A <0.5 mm, the core metal 63 is pressed into the outer ring 25 when the core metal 63 is press-fitted. As long as the protruding portion 71 comes into contact with the pressure contact surface 69, the other portions may or may not be in contact.

It is a longitudinal cross-sectional view of the bearing of the wheel bearing apparatus which shows 1st Embodiment of this invention. It is a side view of the said wheel bearing apparatus. It is a principal part expanded sectional view of the said wheel bearing apparatus. It is a simplification figure of the rotational speed detection apparatus of the said wheel bearing apparatus. The rotational speed detection apparatus of the said wheel bearing apparatus is shown, (a) is a simplified diagram of a 1st modification, (b) is a simplified figure of a 2nd modification, (c) is sectional drawing, and is 3rd. It is a simplified diagram of a modification. 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

DESCRIPTION OF SYMBOLS 1 Hub wheel 2 Double row rolling bearing 3 Constant velocity universal joint 23 Stepped part 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 configuration Part 63 Core metal 64 Resin part 65 Rotational speed sensor 68 Resin part corresponding part 69 Core metal pressure contact surface 71 Projection part

Claims (7)

An outer ring having a double row outer raceway formed on the inner circumference, at least one inner race having an inner raceway facing the outer raceway surface of the outer ring on the outer circumference, and the outer raceway and inner ring of the outer ring A wheel bearing device capable of detecting the rotational speed of a wheel by a rotational speed device, comprising a bearing structure portion having a rolling element that is rotatably accommodated between the inner rolling surface of
The rotational speed device includes a magnetic encoder attached to the inner ring side of the bearing structure portion and a sensor component portion attached to the outer ring side of the bearing structure portion, and the sensor component portion is an end of the outer ring of the bearing structure portion. A metal core press-fitted into the core, a resin part attached to the metal core, and a rotation speed sensor embedded in the resin part and facing the magnetic encoder through an air gap. A wheel bearing device characterized in that substantially the entire resin portion corresponding portion protrudes toward the core metal pressure contact surface side of the outer ring from other portions. An outer ring having a double row outer raceway formed on the inner circumference, at least one inner race having an inner raceway facing the outer raceway surface of the outer ring on the outer circumference, and the outer raceway and inner ring of the outer ring A wheel bearing device capable of detecting the rotational speed of a wheel by a rotational speed device, comprising a bearing structure portion having a rolling element that is rotatably accommodated between the inner rolling surface of
The rotational speed device includes a magnetic encoder attached to the inner ring side of the bearing structure portion and a sensor component portion attached to the outer ring side of the bearing structure portion, and the sensor component portion is an end of the outer ring of the bearing structure portion. A metal core press-fitted into the core, a resin part attached to the metal core, and a rotation speed sensor embedded in the resin part and facing the magnetic encoder through an air gap. 2. The wheel bearing device according to claim 1, wherein the sensor corresponding portion of the resin portion corresponding portion protrudes toward the core metal pressure contact surface side of the outer ring.   3. The wheel bearing device according to claim 1, wherein 0 mm <A <0.5 mm, where A is the amount of protrusion of the protruding portion of the outer ring toward the core metal pressure contact surface side.   The wheel bearing device according to any one of claims 1 to 3, wherein the pair of inner rings are mounted in a state where the abutting surfaces are abutted against each other.   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 is formed on the outer diameter surface of the hub wheel so that the outer rolling surface of the outer ring faces. In addition, a stepped portion is formed on the inboard side of the outer diameter surface of the hub wheel, and an inner ring having an inner rolling surface facing the outer rolling surface on the outer periphery is fitted to the stepped portion. The wheel bearing device according to any one of claims 1 to 3, wherein the wheel bearing device is provided.   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 inward rolling surface in which a first outer rolling surface of the outer ring faces an outer diameter surface of the hub wheel. 2. A running surface is formed, and a second inner rolling surface facing the second outer rolling surface of the outer ring is formed on the outer diameter surface of the outer joint member of the constant velocity universal joint. The wheel bearing device according to any one of claims 1 to 3.   The labyrinth seal disposed on the outer side of the seal member that closes the opening on the inboard side of the bearing structure portion by mounting the sensor constituting portion is configured. The wheel bearing apparatus of any one of Claims.

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