JP2008261462A - Bearing device for wheel with rotational speed detector - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a bearing device for a wheel with a rotational speed detector reduced in weight and size and increased in reliability by preventing foreign matter from entering directly into a sensor holder. <P>SOLUTION: A sensor holder 10 comprises a synthetic resin holding part 12 by which a rotational speed sensor 14 is held, a cylindrical fitting part 11a fitted onto the end of an outer member 5, and a cover 11 having a flange part 11b extending from the cylindrical fitting part radially inward and fitted close to the end surface of the outer member 5 and a bottom part 11c extending radially inward. A shield plate 28 having a fitting part 28a formed of a steel plate by press and fitted onto the bottom part 11c and a shielding part 28b temporarily extending from the fitting part radially outward and partly overlapped therewith, formed in a generally L-shape in cross section, and generally forming a part of a ring is joined to the cover 11. A labyrinth seal 31 having a small radial gap is formed between the shielding part 28b and the knuckle 30. The holding part 12 is formed generally rectangular in cross section and generally in a ring shape by injection molding. The holding part is so formed that the inner diameter part 26 and the outer diameter part 27 are parallel to the shoulder part 23 of an outer joint member 22 and the inner diameter of a knuckle 28. Also, the holding part is so formed that the inner diameter part 26 and the outer diameter part 27 form labyrinth seals 29, 30 by facing the shoulder part 23 and the knuckle 28 through the radial gap set within the range of 0.5 to 3.0 mm. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a wheel bearing device with a rotational speed detection device that rotatably supports a wheel of an automobile or the like and incorporates a rotational speed detection device that detects the rotational speed of the wheel.

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

  In general, the rotational speed sensor is attached to the knuckle after the wheel bearing device is attached to the knuckle constituting the suspension device. However, in order to eliminate the complexity of adjusting the air gap between the rotational speed sensor and the magnetic encoder and to achieve a more compact design, recently, a bearing for a wheel with a rotational speed detection device that also incorporates the rotational speed sensor in the bearing. A device has been proposed.

  A structure as shown in FIG. 4 is known as an example of such a wheel bearing device with a rotational speed detection device. This rotational speed detection device includes an encoder 51 fitted on the inner ring 50, a sensor holder 53 attached to the end of the outer member 52 so as to face the encoder 51, and a predetermined air to the encoder 51. And a rotation speed sensor 54 facing each other through a gap. The encoder 51 is joined to the side surface of the slinger 57 constituting the seal 56.

  The seal 56 includes a slinger 57 having a substantially L-shaped cross section, and an annular seal plate 58 attached to the outer member 52 so as to face the slinger 57 and having a substantially L-shaped cross section. The slinger 57 includes a cylindrical portion 57a that is externally fitted to the inner ring 50, and a standing plate portion 57b that extends radially outward from the cylindrical portion 57a. On the other hand, the seal plate 58 includes a metal core 59 fitted into the end of the outer member 52, and a seal member 60 vulcanized and bonded to the metal core 59. The seal member 60 is made of an elastomer such as rubber, and includes a side lip 60a that is in sliding contact with the standing plate portion 57b of the slinger 57, and a grease lip 60b and an intermediate lip 60c that are in sliding contact with the cylindrical portion 57a.

  The sensor holder 53 includes a steel plate cover 55 fitted on the outer member 52 and a synthetic resin holding portion 61 coupled to the bottom portion 55c of the cover 55. The rotation speed sensor is connected to the holding portion 61. 54 is embedded. The cover 55 includes a cylindrical fitting portion 55a in which the outer member 52 is fitted, a flange portion 55b extending radially inward from the fitting portion 55a, and a bottom portion 55c extending in an axial direction from the flange portion 55b. It consists of.

  The output of the rotational speed sensor 54 is taken out by the harness 62 and sent to an ABS controller (not shown). The harness 62 is connected via an extraction port 63 provided in the holding portion 61, and the extraction port 63 is formed at an inclination angle α set larger than the inclination angle β of the outer peripheral surface of the outer joint member 64. ing.

As a result, the harness 62 can be prevented from sagging and interfering with the outer joint member 64, so that the number of clips for stopping the harness 62 from sagging can be minimized, and the harness 62 itself need not be bent excessively. Therefore, the adverse effect on the internal wiring can be prevented and the reliability can be further improved. Therefore, the fixing work of the harness 62 can be simplified with a simple configuration, the assembling workability can be improved, and the cost can be reduced.
JP 2006-145418 A

  However, in this conventional wheel bearing device with a rotational speed detection device, the sensor holder 53 is disposed between the knuckle 66 and the outer joint member 64, so that the annular shape between the knuckle 66 and the outer joint member 64 is provided. There is a possibility that foreign matter such as muddy water enters from the space and the detection accuracy is lowered, and pebbles or the like directly collide with the sensor holder 53 to be damaged.

  The present invention has been made in view of such circumstances, and is intended for a wheel with a rotational speed detection device that is light and compact, and that prevents foreign matter from directly entering the sensor holder and improves reliability. It aims at providing a bearing device.

  In order to achieve such an object, the invention described in claim 1 of the present invention has a vehicle body mounting flange integrally attached to the knuckle on the outer periphery, and a double row outer rolling surface is integrally formed on the inner periphery. And a hub wheel having a cylindrical small-diameter step portion extending in the axial direction on the outer periphery, and a small-diameter step of the hub wheel. An inner member formed of at least one inner ring press-fitted into a portion, and formed with a double-row inner rolling surface facing the double-row outer rolling surface on the outer periphery, and the inner member and the outer member A double row rolling element accommodated between the rolling surfaces of the two rolling surfaces, and a seal attached to an opening of an annular space formed between the outer member and the inner member, An outer joint member of a constant velocity universal joint is fitted into the hub wheel, and the outer joint member The outer joint member is detachably unitized with the hub wheel so that torque can be transmitted to the hub wheel and the outer member is attached to the inner end of the outer member. A sensor holder provided with a rotation speed sensor for detecting the rotation speed of the wheel, and a side surface of a slinger that is fitted on the inner ring and constitutes the seal, and is connected to the rotation speed sensor via an axial clearance. In the wheel bearing device with a rotational speed detection device in which the rotational speed detection device composed of a magnetic encoder opposed to each other is built, the sensor holder includes a synthetic resin holding portion in which the rotational speed sensor is embedded; A cylindrical fitting portion that is formed into an annular shape by pressing from a steel plate and is fitted on the inner side end portion of the outer member, and extends radially inward from the fitting portion, and the outer portion. And a cover formed by pressing from a steel plate to the cover. Is covered.

  Thus, in the wheel bearing device with a rotation speed detection device of the inner ring rotation type, the sensor holder is formed in an annular shape by pressing from a synthetic resin holding portion in which the rotation speed sensor is embedded, and a steel plate, A cylindrical fitting portion that is fitted on the inner side end portion of the outer member, a flange portion that extends radially inward from the fitting portion, and that is in close contact with the end surface of the outer member, and the flange portion And a cover comprising a bottom portion extending radially inward from this, a shield plate formed by pressing from a steel plate is joined to this cover, and the holding portion is covered, so muddy water, pebbles, etc. from the outside It is possible to provide a wheel bearing device with a rotational speed detection device that prevents foreign matter from directly entering the holding portion and improves reliability.

  Further, as in the invention described in claim 2, the shield plate has a fitting portion welded to the bottom portion of the cover, and a shielding portion hanging from the fitting portion, and the cross section is L-shaped. As a whole, it may be formed in a fan shape that forms a part of an annulus, and as in the invention according to claim 3, the shield plate is fitted and fixed to the bottom of the cover. And a shielding portion depending from the fitting portion, and the cross section may be formed in an L shape and an annular shape as a whole.

  Preferably, as in the invention described in claim 4, the shielding portion of the shield plate is formed by being partially overlapped and extending radially outward from the fitting portion, and the shielding portion and the If a labyrinth seal with a slight radial clearance is formed between the knuckle and the rigidity and strength of the entire shield plate, the desired diameter between the knuckle and the shape and dimensions of the cover will increase. A directional clearance can be easily formed, and a labyrinth seal having a high degree of design freedom and high sealing performance can be formed.

  If a labyrinth seal having a slight radial clearance is formed between the shielding portion of the shield plate and the shoulder portion of the outer joint member as in the invention described in claim 5, the detection portion It is possible to improve the sealing accuracy and prevent foreign matter from entering, and further improve detection accuracy and reliability.

  The wheel bearing device with a rotational speed detection device according to the present invention has an outer body integrally provided with a vehicle body mounting flange for being attached to a knuckle on the outer periphery, and an outer side in which a double row outer rolling surface is integrally formed on the inner periphery. A hub ring having a member and a wheel mounting flange for mounting a wheel at one end, and having a cylindrical small diameter step portion extending in the axial direction on the outer periphery, and a press fit into the small diameter step portion of the hub ring An inner member comprising at least one inner ring and formed on the outer periphery with a double row inner rolling surface facing the double row outer rolling surface, and both rolling of the inner member and the outer member. A double row rolling element housed in a freely rollable manner between the surfaces, and a seal attached to an opening of an annular space formed between the outer member and the inner member; The outer joint member of the constant velocity universal joint is fitted inside, and the shoulder of the outer joint member is The outer joint member is unitized so as to be able to transmit torque to the hub wheel and be detachable in a state of being in contact with the end surface of the inner ring, and is attached to the inner side end of the outer member, A sensor holder provided with a rotation speed sensor for detecting the rotation speed of the wheel and a side surface of a slinger that is fitted on the inner ring and constitutes the seal, and is opposed to the rotation speed sensor via an axial clearance. In the wheel bearing device with a rotational speed detection device incorporating the rotational speed detection device comprising the magnetic encoder, the sensor holder includes a synthetic resin holding portion in which the rotational speed sensor is embedded, and a steel plate. A cylindrical fitting portion that is formed into an annular shape by press work and is fitted on the inner side end of the outer member, and extends radially inward from the fitting portion, and ends of the outer member And a cover comprising a bottom portion extending further inward in the radial direction from the flange, a shield plate formed by pressing from a steel plate is joined to the cover, and the holding portion is covered. Therefore, it is possible to provide a wheel bearing device with a rotation speed detection device that prevents foreign matters such as muddy water and pebbles from directly entering the holding portion from the outside and improves the reliability.

  A vehicle body mounting flange to be attached to the knuckle on the outer periphery, an outer member in which a double row outer rolling surface is integrally formed on the inner periphery, and a wheel mounting flange to mount a wheel on one end A hub wheel integrally formed and formed on the outer periphery with an inner rolling surface facing one of the double row outer rolling surfaces, and a cylindrical small-diameter stepped portion extending in the axial direction from the inner rolling surface; and An inner member comprising an inner ring press-fitted into the small-diameter step portion of the hub wheel and having an inner rolling surface facing the other of the outer rolling surfaces of the double row on the outer periphery, and the inner member and the outer member A double row rolling element housed between the rolling surfaces of the member so as to be freely rollable, and a seal attached to an opening of an annular space formed between the outer member and the inner member. The outer joint member of the constant velocity universal joint is fitted into the hub wheel, and the shoulder portion of the outer joint member is The outer joint member is detachably unitized with the hub wheel in a state of abutting against the end surface of the inner ring, and is attached to the inner side end of the outer member, A sensor holder provided with a rotation speed sensor for detecting the rotation speed of the wheel and a side surface of a slinger that is fitted on the inner ring and constitutes the seal, and is opposed to the rotation speed sensor via an axial clearance. In the wheel bearing device with a rotation speed detection device including a rotation speed detection device including the magnetic encoder, the sensor holder includes a synthetic resin holding portion in which the rotation speed sensor is embedded, and a steel plate. A cylindrical fitting portion that is formed into an annular shape by press working and is fitted on the inner side end portion of the outer member, and extends radially inward from the fitting portion to end the outer member. And a cover comprising a bottom portion extending further inward in the radial direction from the flange portion. The cover is formed by pressing from a steel plate and is fitted to the bottom portion of the cover. A shield plate having a joint portion and a shield portion formed by partially overlapping and extending radially outward from the fitting portion, having a L-shaped cross section and forming a part of a ring as a whole. A labyrinth seal having a slight radial clearance is formed between the shield portion of the shield plate and the knuckle.

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 showing a detection unit of FIG. 1, and FIG. It is the partial arrow line view seen from the III direction. In the following description, the side closer to the outer side of the vehicle in a state assembled to the vehicle is referred to as the outer side (left side in the drawing), and the side closer to the center is referred to as the inner side (right side in the drawing).

  This wheel bearing device with a rotational speed detection device is called a third generation for driving wheels, and includes an inner member 3 composed of a hub wheel 1 and an inner ring 2, and double row rolling elements (balls) on the inner member 3. 4 and 4 and an outer member 5 that is inserted through 4 and 4.

  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, and hub bolts 6 a are implanted at circumferentially equidistant positions of the wheel mounting flange 6. Yes. Further, an outer side (one) inner rolling surface 1a and a cylindrical small-diameter step portion 1b extending in the axial direction from the inner rolling surface 1a are formed on the outer periphery, and a torque transmission serration ( Or a spline) 1c is formed. An inner ring 2 having an inner side (the other side) inner raceway surface 2a formed on the outer periphery thereof is press-fitted and fixed to the small-diameter step portion 1b of the hub wheel 1 through a predetermined shimiro.

  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 a base portion 6b of a wheel mounting flange 6 serving as a seal land portion of a seal 8 described later. The surface hardness of the small-diameter step portion 1b is set to a range of 58 to 64 HRC by induction hardening. As a result, not only the wear resistance of the base portion 6b is improved, but also the fretting of the small-diameter stepped portion 1b serving as the fitting surface of the inner ring 2 is suppressed and the rotational bending load applied to the wheel mounting flange 6 is suppressed. And sufficient mechanical strength, and the durability of the hub wheel 1 is improved. The inner ring 2 and the rolling element 4 are made of a high carbon chrome bearing steel such as SUJ2, and are hardened in the range of 58 to 64 HRC up to the core by quenching.

  The outer member 5 is made of medium-high carbon steel containing 0.40 to 0.80 wt% of carbon such as S53C, and integrally has a vehicle body mounting flange 5b for attaching to a knuckle (not shown) on the outer periphery. The inner member 3 is integrally formed with double row outer rolling surfaces 5a, 5a facing the double row inner rolling surfaces 1a, 2a. These outer rolling surfaces 5a and 5a are subjected to a hardening process in a range of 58 to 64 HRC by induction hardening. Double row rolling elements 4, 4 are accommodated between outer rolling surfaces 5a, 5a of the outer member 5 and double row inner rolling surfaces 1a, 2a facing the outer rolling surfaces 5a, 5a, respectively. It is held so that it can roll freely. In addition, seals 8 and 9 are attached to the opening of the annular space formed between the outer member 5 and the inner member 3, and leakage of lubricating grease sealed inside the bearing and the inside of the bearing from the outside. Prevents intrusion of rainwater and dust.

  The constant velocity universal joint 13 includes an outer joint member 22, a joint inner ring (not shown), a cage, and a torque transmission ball. The outer joint member 22 integrally includes a shaft portion 24 extending in the axial direction from the shoulder portion 23. A serration 24a that engages with the serration 1c of the hub wheel 1 is formed on the outer periphery of the shaft portion 24, and a male screw 24b is formed at the end of the serration 24a. Then, the outer joint member 22 is fitted into the hub wheel 1 via the serrations 1c and 24a until the shoulder portion 23 abuts with the end surface of the inner ring 2, and the hub wheel 1 and the outer side are fixed by the fixing nut 25 fastened to the male screw 24b. The joint member 22 is unitized so that torque can be transmitted and detachable.

  In the present embodiment, the sensor holder 10 is attached to the end of the outer member 5. The sensor holder 10 includes a cover 11 formed in a cup shape and a holding portion 12 coupled to the cover 11. As shown in FIG. 2 in an enlarged manner, the cover 11 is a cylindrical fitting portion 11a that is press-fitted into the outer periphery of the inner side end of the outer member 5, and extends radially inward from the fitting portion 11a. The flange portion 11b is in close contact with the end face of the outer member 5, and the bottom portion 11c extends further radially inward from the flange portion 11b, and is formed in an annular shape as a whole.

  As described above, the fitting portion 11a is fitted on the inner side end of the outer member 5 with the flange portion 11b in close contact with the end surface of the outer member 5. Thus, the sensor holder 10 can be positioned and fixed easily and accurately, and the rotational speed of the wheel can be detected with high accuracy. The cover 11 is formed by pressing a non-magnetic steel plate having corrosion resistance, for example, a stainless steel plate such as an austenitic stainless steel plate (JIS standard SUS304 type or the like). As a result, there is provided a wheel bearing device with a rotational speed detection device that does not adversely affect the sensing performance of the rotational speed sensor 14 to be described later, and that prevents rusting of the cover 11 and maintains reliability over a long period of time. can do.

  In addition, the holding portion 12 is integrally joined to one place on the outer side in the radial direction of the bottom portion 11 c in the cover 11. The holding portion 12 is formed by injection molding from a non-magnetic synthetic resin material such as polyphenylene sulfide (PPS) and is opposed to a magnetic encoder 16 described later via a predetermined axial clearance (air gap). Is embedded. This rotational speed sensor 14 incorporates a magnetic detecting element such as a Hall element, a magnetoresistive element (MR element) or the like that changes its characteristics according to the flow direction of magnetic flux, and a waveform shaping circuit that adjusts the output waveform of this magnetic detecting element. IC. Thereby, it is possible to detect the rotational speed with high reliability at low cost. In addition, the holding | maintenance part 12 can illustrate synthetic resins which can be injection-molded, such as PA (polyamide) 66 and polybutylene terephthalate (PBT) other than the material mentioned above.

  A slinger 15 is press-fitted into the outer diameter of the inner ring 2 so as to face the holding portion 12 in the axial direction. The slinger 15 constitutes an inner-side seal 9 described later, and includes a cylindrical portion 15a that is press-fitted into the inner ring 2 and a standing plate portion 15b that extends radially outward from the cylindrical portion 15a. The slinger 15 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). The cross section is formed in a substantially L shape by pressing. A magnetic encoder 16 in which magnetic material powder such as ferrite is mixed in an elastomer such as rubber is integrally joined to the inner side surface of the standing plate portion 15b of the slinger 15 by vulcanization adhesion or the like. The magnetic encoder 16 is magnetized with magnetic poles N and S alternately in the circumferential direction to constitute a rotary encoder for detecting the rotational speed of the wheel.

  The inner side seal 9 is constituted by a so-called pack seal comprising the slinger 15 and an annular seal plate 17 mounted on the outer member 5 so as to face the slinger 15 and having a substantially L-shaped cross section. Has been. The seal plate 17 includes a core 18 including a cylindrical portion 18a that is fitted into the inner end of the outer member 5, and a vertical plate 18b that extends radially inward from one end of the cylindrical portion 18a. It consists of a sealing member 19 vulcanized and bonded to the core 18. The core 18 is formed by press working from an austenitic stainless steel plate (JIS standard SUS304 type or the like) or a rust-proof cold rolled steel plate (JIS standard SPCC type or the like).

  On the other hand, the seal member 19 is made of an elastic member such as synthetic rubber, and includes a side lip 19a that is in sliding contact with the standing plate portion 15b of the slinger 15, and a grease lip 19b and an intermediate lip 19c that are in sliding contact with the cylindrical portion 15a. A labyrinth seal 20 is configured such that the outer edge of the standing plate portion 15b of the slinger 15 is opposed to the cylindrical portion 18a of the core metal 18 through a slight radial clearance.

  In the present embodiment, the inner seal 9 and the sensor holder 10 are disposed opposite to each other in the axial direction, the magnetic encoder 16 is integrally joined to the slinger 15 constituting the seal 9, and the holding part constituting the sensor holder 10. 12, the rotational speed sensor 14 is embedded, and the rotational speed sensor 14 and the magnetic encoder 16 are arranged to face each other in the axial direction. The output of the rotational speed sensor 14 is taken out by the harness 21 and sent to an ABS controller (not shown).

  Here, the outer diameter D1 of the shoulder 23 of the outer joint member 22 is set to be smaller than the outer diameter D2 of the inner ring 2, and the inner side end face 5c of the outer member 5 and the inner side of the inner ring 2 are set. The end face 2b is configured to be substantially flush. This makes it possible to set the radial cross-sectional height of the sensor holder 10 to be equal to or higher than the cross-sectional height of the seal 9, increasing the design freedom of the sensor holder 10 without being restricted by the shape and dimensions, and the bearing. It is possible to reduce the weight and size by effectively utilizing the space between the outer joint member 22 and the outer joint member 22.

  Further, the holding portion 12 of the sensor holder 10 is formed in a substantially rectangular shape in cross section, and the inner diameter portion is formed to be parallel to the shoulder portion 23 of the outer joint member 22, and the inner diameter portion of the holding portion 12 is slight. A labyrinth seal 26 is formed so as to face the shoulder 23 via a radial clearance. As a result, the space between the bearing portion and the outer joint member 22 can be used effectively, and further compactness can be achieved, and the labyrinth seal 26 enhances the sealing performance of the detection portion and foreign matter enters. Can be prevented, detection accuracy can be improved, and reliability can be maintained over a long period of time. The radial clearance between the holding portion 12 and the shoulder portion 23 is preferably set in the range of 0.5 to 3.0 mm. Thereby, interference with both can be avoided and sealing performance can be ensured.

  Further, a labyrinth seal 27 is formed so that the inner edge of the bottom portion 11c of the cover 11 faces the shoulder portion 23 through a slight radial clearance. As a result, the magnetic encoder 16 is not exposed to the outside by the bottom portion 11c, so that not only can the pebbles and the like directly collide with the magnetic encoder 16 from the outside, but also the foreign matter such as dust can be further enhanced. Can be prevented from entering the detector, and desired detection accuracy can be ensured over a long period of time.

  Here, in this embodiment, the shield plate 28 is joined to the cover 11 of the sensor holder 10 so as to cover the holding portion 12 portion. That is, the shield plate 28 has a cylindrical fitting portion 28a and a shielding portion 28b that hangs down from the fitting portion 28a, has a substantially L-shaped cross section, and forms a fan shape as a whole. The fitting portion 28a is integrally joined to the cylindrical portion of the bottom portion 11c of the cover 11 by spot welding. The shield plate 28 is formed by pressing a non-magnetic steel plate having corrosion resistance, for example, a stainless steel plate such as an austenitic stainless steel plate (JIS standard SUS304 type or the like).

  As shown in FIG. 3, an extraction window 29 for accommodating the harness 21 is formed in the shielding portion 28 b of the shield plate 28. Labyrinth seals 31 and 32 having a slight radial clearance are formed between the shield plate 28 and the knuckle 30 and the shoulder 23 of the outer joint member 22.

  Thus, the shield plate 28 is joined to the cover 11 of the sensor holder 10, the holding portion 12 portion is covered and shielded from the outside, and the labyrinth seal 31 is interposed between the shield plate 28, the knuckle 30 and the shoulder portion 23. , 32 is formed, so that it is possible to provide a wheel bearing device with a rotation speed detecting device that prevents foreign matters such as muddy water and pebbles from directly entering the holding portion 12 and improves reliability. it can. Further, since the shielding portion 28b of the shield plate 28 extends from the fitting portion 28a to the outside in the radial direction and is partially overlapped, the overall rigidity / strength is increased and the shape of the cover 11 is increased. A desired radial clearance can be easily formed between the knuckle 30 and the labyrinth seal 31 with a high degree of design freedom and high sealing performance.

  In this example, the cover 11 and the shield plate 28 are joined by spot welding. However, the present invention is not limited to this. For example, although not shown, the shield plate is formed in an annular shape on the bottom 11c of the cover 11. You may make it externally fix. Thereby, in addition to the labyrinth seal 27 of the cover 11, the labyrinth seal 32 of the shield plate can be formed over the entire circumference, and the sealing performance of the detection unit can be further enhanced.

  Here, as an example of the rotational speed detection device, an active type rotational speed detection device including a magnetic encoder 16 and a rotational speed sensor 14 including a magnetic detection element such as a Hall element is illustrated, but the rotational speed detection device according to the present invention is illustrated. The apparatus is not limited to this, and may be a passive type including, for example, a gear, a magnet, and an annular coil wound.

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

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

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 which shows the detection part of FIG. It is the partial arrow line view seen from the III direction of FIG. It is a principal part enlarged view which shows the conventional wheel bearing apparatus with a rotational speed detection apparatus.

Explanation of symbols

1 ... hub wheel 1a, 2a ... inner rolling surface 1b ...・ Small diameter step 1c, 24a ... Serration 2 ... Inner ring 2b ... Inner ring end face 3 ... inner member 4 ... rolling element 5 ...・ ・ ・ ・ ・ ・ Outer member 5a ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ Outside rolling surface 5b ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ Car body mounting flange 5c ・ ・ ・················ 6 Hub bolt 6b ... Base 7 ... Retainer 8 ...・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ Outer side seal 9 ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ Inner side seal 10 ・ ・ ・ ・ ・ ・ ・ ・· Sensor holder 11 ················· Covers 11a, 28a ·········································· 11c ···········································································. Joint 14 ·········· Rotational speed sensor 15 ··············· Slinger 15a, 18a ······················ 15 , 18b ... Standing plate 16 ... Magnetic encoder 17 ... Seal plate 18 ...・ ・ ・ ・ ・ ・ ・ ・ Core 19・ ・ ・ ・ ・ ・ ・ ・ Seal member 19a ・ ・ ・ ・ ・ ・ ・ ・ Side lip 19b ・ ・ ・ ・ ・ ・ ・ ・ Grease lip 19c ・ ・ ・ ・ ・ ・・ ・ ・ ・ Intermediate lips 20, 26, 27, 31, 32 ・ ・ Labyrinth seal 21 ・ ・ ・ ・ ・ ・ ・ ・ ・ Harness 22 ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・・ ・ Outer joint member 23 ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ Shoulder 24 ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ Shaft 24b ・ ・ ・ ・ ・ ・... Male screw 25 ......... Fixing nut 28 ......... Shield plate 28b ... .... Shielding part 29 ... Extraction window 30 ... Knuckle 50 ...・ ・ Inner ring 51 ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・・ ・ Encoder 52 ・ ・ ・ ・ ・ ・ ・ ・ ・ Outer member 53 ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ Sensor holder 54 ・ ・ ・ ・ ・ ・... Rotational speed sensor 55 ..... Cover 55a ..... Fitting part 55b ...・ ・ ・ Hut 55c ・ ・ ・ ・ ・ ・ ・ ・ Bottom 56 ・ ・ ・ ・ ・ ・ ・ ・ Seal 57 ・ ・ ・ ・ ・ ・ ・ ・・ Slinger 57a ・ ・ ・ ・ ・ ・ ・ ・ Cylindrical part 57b ・ ・ ・ ・ ・ ・ ・ ・ Standing plate part 58 ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・Seal plate 59 ... Core metal 60 ... Seal member 60a ... Side lip 60b ... Grease lip 60c ...・ ・ ・ ・ ・ ・ ・ ・ ・ Intermediate lip 61 ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ Holding part 62 ・ ・ ・ ・ ・ ・ ・ ・ ・ Harness 63 ··························································· Outer joint member 65・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ Knuckle D1 ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ Outer diameter D2 of shoulder of outer joint member ・ ・ ・ ・ ・ ・ ・ ・・ Outer diameters of inner ring α, β ・ ・ ・ Inclination angle

Claims (5)

An outer member integrally having a vehicle body mounting flange for being attached to the knuckle on the outer periphery, and an outer rolling surface of a double row integrally formed on the inner periphery;
A hub wheel integrally having a wheel mounting flange for mounting a wheel at one end and having a cylindrical small-diameter step portion extending in the axial direction on the outer periphery, and at least one press-fitted into the small-diameter step portion of the hub ring An inner member formed of two inner rings, and formed on the outer periphery with a double-row inner rolling surface facing the double-row outer rolling surface;
A double row rolling element accommodated in a freely rolling manner 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 outer joint member of a constant velocity universal joint is fitted into the hub wheel, and the outer joint member can transmit torque to the hub wheel in a state where a shoulder portion of the outer joint member abuts against an end surface of the inner ring. In addition to being detachable as a unit,
A sensor holder mounted on the inner side end of the outer member and provided with a rotational speed sensor for detecting the rotational speed of the wheel;
Rotational speed detection device having a built-in rotational speed detection device comprising a magnetic encoder externally fitted to the inner ring and joined to a side surface of a slinger constituting the seal and opposed to the rotational speed sensor via an axial clearance. In the bearing device for wheel with
The sensor holder is formed of a synthetic resin holding portion in which the rotational speed sensor is embedded, and a cylindrical shape that is formed into an annular shape by pressing from a steel plate and is fitted on the inner side end of the outer member. A cover that includes a fitting portion, a flange portion extending radially inward from the fitting portion and in close contact with the end surface of the outer member, and a bottom portion extending further radially inward from the flange portion. A wheel bearing device with a rotational speed detector is provided, wherein a shield plate formed by pressing from a steel plate is joined to the cover and the holding portion is covered.   The shield plate has a fitting part welded to the bottom part of the cover and a shielding part hanging from the fitting part, and the section is L-shaped and formed into a fan shape that forms a part of a ring as a whole. The wheel bearing device with a rotation speed detection device according to claim 1.   The shield plate has a fitting portion that is fitted and fixed to the bottom portion of the cover, and a shielding portion that hangs down from the fitting portion, and is formed in an annular shape as a whole in an L shape in cross section. A wheel bearing device with a rotational speed detection device according to claim 1.   A labyrinth seal in which the shielding portion of the shield plate extends from the fitting portion to the outside in the radial direction and partially overlaps, and has a slight radial clearance between the shielding portion and the knuckle. The wheel bearing apparatus with a rotational speed detection apparatus of Claim 2 or 3 in which is formed.   5. A wheel bearing with a rotational speed detection device according to claim 1, wherein a labyrinth seal having a slight radial clearance is formed between a shielding portion of the shield plate and a shoulder portion of the outer joint member. apparatus.

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