JP2005299764A - Bearing device for wheel with rotation speed detection device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a bearing device for a wheel with a rotation speed detection device capable of being miniaturized, preventing foreign matter from intruding into a detection part, and improving durability and reliability. <P>SOLUTION: This bearing device for the wheel provided with the rotation speed detection device is provided with an encoder 19 fitted externally into an inner ring 6, an annular sensor holder 15 mounted in an end part of an outward member 4 by opposing to the encoder 19, and a rotation speed sensor 20 molded integrally with the sensor holder 15 and opposing to the encoder 19 through a predetermined clearance in the radial direction. The encoder 19 is composed of a magnetic encoder forming a circular ring, a seal 11 is arranged on an inboard side of the encoder 19, and the seals 11 are mounted on the sensor holder 15 and the inner ring 6, respectively. The seal 11 is composed of a first annular seal plate 21 and a second annular seal plate 22 arranged by opposing mutually, and the encoder 19 is integrally vulcanized and bonded on the second seal plate 22. <P>COPYRIGHT: (C)2006,JPO&NCIPI

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.

  Rotation speed detection device with built-in rotation speed detection device to detect the rotation speed of the wheel to control the anti-lock brake system (ABS) while supporting the wheel of the automobile rotatably with the suspension system Wheel bearing devices are generally known. Conventionally, in such a wheel bearing device, a sealing device is provided between an inner member and an outer member that are in rolling contact with a rolling element, and a magnetic encoder in which magnetic poles are alternately arranged in a circumferential direction is provided as the sealing device. In addition, the rotational speed detection device is configured by a magnetic encoder and a rotational speed sensor that is arranged to face the magnetic encoder and detects a change in magnetic pole of the magnetic encoder as the wheel rotates.

  Generally, the rotational speed sensor is attached to the knuckle after the wheel bearing device is attached to the knuckle constituting the suspension device. However, in order to eliminate the complexity of the air gap adjustment work between the rotation speed sensor and the magnetic encoder and to achieve a more compact design, recently, a bearing device for a wheel with a rotation speed detection device in which the rotation speed sensor is also incorporated in the bearing. Has been proposed.

  A structure as shown in FIG. 5 is known as an example of such a wheel bearing device with a rotational speed detection device. This wheel bearing device with a rotational speed detection device is supported and fixed to a suspension device (not shown), an outer member 51 serving as a fixing member, and the outer member 51 via double-row rolling elements (balls) 53 and 53. The outer member 51 has a body mounting flange 51b integrally formed on the outer periphery, and double row outer rolling surfaces 51a and 51a are formed on the inner periphery. . On the other hand, the inner member 52 is formed with double-row inner rolling surfaces 55a and 56a facing the outer rolling surfaces 51a and 51a of the outer member 51 described above. Of these double-row inner rolling surfaces 55a, 56a, one inner rolling surface 55a is integrally formed on the outer periphery of the hub wheel 55, and the other inner rolling surface 56a extends from the inner rolling surface 55a of the hub wheel 55. It is formed on the outer periphery of an inner ring 56 that is press-fitted into a cylindrical small-diameter step portion 55b extending in the axial direction. And the double row rolling elements 53 and 53 are accommodated between these both rolling surfaces, respectively, and are hold | maintained by the holder | retainers 57 and 57 so that rolling is possible.

  The hub wheel 55 integrally has a wheel mounting flange 54 for mounting a wheel (not shown) on the outer periphery, and a hub bolt 54 a for fixing the wheel is planted at a circumferentially equidistant position of the wheel mounting flange 54. It is installed. Further, a serration 55c is formed on the inner periphery of the hub wheel 55, in which a stem portion 61 of an outer joint member 60 constituting a constant velocity universal joint (not shown) is fitted. The inner member 52 refers to the hub ring 55 and the inner ring 56. Seals 58 and 59 are attached to the end of the outer member 51 to prevent leakage of lubricating grease sealed inside the bearing and intrusion of rainwater, dust, etc. into the bearing from the outside.

  As shown in an enlarged view in FIG. 6, the inboard side seal 59 is fitted into the inner periphery of the end of the outer member 51 and has a first seal plate 62 having an L-shaped cross section, and the first seal plate 62. And a second seal plate 63 having an L-shaped cross section. The second seal plate 63 has a cylindrical portion 63a fitted on the inner ring 56, and a standing plate portion 63b extending radially outward from the cylindrical portion 63a. The second sealing plate 63 is formed on the outer surface of the standing plate portion 63b. The magnetic encoder 64 made of a rubber magnet in which magnetic powder is mixed and magnetic poles N and S are alternately formed in the circumferential direction is integrally vulcanized and bonded.

  On the other hand, the first seal plate 62 is a cored bar 65 having an L-shaped cross section and is integrally vulcanized and bonded to the cored bar 65 so that the inner surface of the upright plate part 63b of the second seal plate 63 is obtained. And a seal member 66 including a pair of radial lips 66b and 66c slidably in contact with the cylindrical portion 63a.

  An annular sensor holder 69 including a fitting cylinder 67 and a holding portion 68 coupled to the fitting cylinder 67 is attached to the end of the outer member 51. The fitting cylinder 67 includes a fitting cylinder part 67a and an inward flange part 67b extending radially inward from the fitting cylinder part 67a, and is formed in an annular shape with an L-shaped cross section.

  The holding portion 68 is embedded therein with a rotational speed sensor 70 facing the magnetic encoder 64 via a predetermined air gap, and is integrally molded in a circular arc shape with a synthetic resin. The rotation speed sensor 70 incorporates a magnetic detection element such as a Hall element, a magnetoresistive element (MR element), etc. that changes its characteristics according to the flow direction of magnetic flux, and a waveform shaping circuit that adjusts the output waveform of the magnetic detection element. It consists of IC.

Here, the labyrinth seal is configured by causing the end face of the inner ring 56 and the inward flange portion 67b of the fitting cylinder 67 to closely face each other through the minute gap 71. Thus, the magnetic encoder 64 and the rotational speed sensor 70 can be connected to each other even before the stem portion 61 of the outer joint member 60 is fitted to the inner diameter of the hub wheel 55, including when it is transported to the assembly line of the automobile finished product manufacturer. It is possible to prevent foreign matter such as magnetic powder from entering between the detection unit and the outside. Therefore, it is possible to improve the reliability of wheel rotation speed detection.
JP 2003-254985 A

  However, such a conventional wheel bearing device with a rotational speed detection device is used before the stem portion 61 of the outer joint member 60 is fitted to the inner diameter of the hub wheel 55, including during transportation to an assembly line of a finished car manufacturer. Even in this state, the labyrinth seal or the simple contact seal is provided with a feature that can prevent foreign matter such as magnetic powder from entering between the magnetic encoder 64 and the detection unit of the rotation speed sensor 70 from the outside. Then, during actual running, which is a harsh environment, it is inevitable that foreign matter such as dust or magnetic powder enters between the magnetic encoder 64 and the detection unit of the rotation speed sensor 70 from the outside. Such foreign matter may wear the magnetic encoder 64 and damage the detection part of the rotational speed sensor 70, possibly reducing the reliability of detecting the rotational speed of the wheel.

  SUMMARY OF THE INVENTION The present invention has been made in view of such circumstances, and has a wheel bearing device with a rotational speed detection device that is compact and prevents foreign matter from entering the detection portion and has improved durability and reliability. The purpose is to provide.

  In order to achieve the object, the invention according to claim 1 of the present invention has a vehicle body mounting flange integrally attached to the suspension on the outer periphery, and a double row outer rolling surface is formed on the inner periphery. A hub wheel having an outer member and a wheel mounting flange for mounting a wheel at one end thereof integrally formed with a cylindrical small diameter step portion extending in the axial direction on the outer periphery, and a small diameter step portion of the hub wheel An inner member formed of an inner ring that is press-fitted and formed on the outer periphery with an inner rolling surface facing the outer rolling surface of the double row, and between the respective rolling surfaces of the outer member and the inner member A double row rolling element housed in a freely rollable manner, an encoder fitted on the inner ring, an annular sensor holder mounted on an end of the outer member so as to face the encoder, and It is molded integrally with the sensor holder, and the encoder has a predetermined diameter. In a wheel bearing device with a rotational speed detection device provided with a rotational speed sensor facing each other through a clearance, the encoder has an annular shape so that characteristics in the circumferential direction change alternately and at equal intervals. And an annular first and second seal plate mounted on the sensor holder and the inner ring, respectively, and arranged opposite to each other. The encoder is integrally provided on the second seal plate.

  As described above, in the wheel bearing device with a rotational speed detection device of the inner ring rotation type, the encoder is formed in an annular shape, and the characteristics in the circumferential direction are alternately and equally spaced. A seal is disposed on the inboard side, and the seal includes annular first and second seal plates that are respectively attached to the sensor holder and the inner ring and disposed opposite to each other. Since it is provided integrally with the seal plate, even in the state before the outer joint member is fitted into the hub wheel, including during transportation to the assembly line of the finished product manufacturer of the automobile, it is also a severe driving environment that becomes a harsh environment Even in this case, it is possible to reliably prevent foreign matter such as magnetic powder from entering between the encoder and the detection unit of the rotation speed sensor. Therefore, the reliability of detecting the rotational speed of the wheel can be significantly improved.

  Preferably, as in the invention described in claim 2, the sensor holder includes a fitting ring made of a steel plate and a holding portion integrally molded with the fitting ring, and the fitting ring is an outer ring. A cylindrical fitting portion that is press-fitted into the outer periphery 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 an axial direction that extends from the flange portion. If the first seal plate is fitted inside the cylindrical portion, the radial direction can be reduced and the surroundings of the rotation speed sensor can be simplified, further improving the assembly workability. To do.

  According to a third aspect of the present invention, the second seal plate is externally fitted to the inner ring, and a cylindrical portion in which the encoder is integrally provided on an outer peripheral surface thereof, and extends from the cylindrical portion in the axial direction. It is formed in a substantially L-shaped cross section having a cylindrical large-diameter step portion and a standing plate portion extending radially outward from the large-diameter step portion, and a labyrinth seal is configured at the tip of the standing plate portion. As a result, the sealing performance is further improved and the reliability of detecting the rotational speed can be improved.

  According to a fourth aspect of the present invention, a shield having a substantially U-shaped cross section is disposed further on the inboard side of the seal, and the shield is placed on the shoulder of the outer joint member through a slight radial clearance. Since the labyrinth seal is configured to face each other, the sealing performance is further improved during actual running.

  The shield includes a first cylindrical portion fitted into the sensor holder, a standing plate portion extending radially inward from the first cylindrical portion, and The labyrinth seal may be configured by a second cylindrical portion extending in the axial direction from the plate portion, with the upright plate portion facing the second seal plate via a slight axial clearance, and As in the invention described in claim 6, a first cylindrical portion fitted into the sensor holder, a standing plate portion extending radially inward from the first cylindrical portion, and an axial direction from the standing plate portion The labyrinth seal may be configured such that the second cylindrical portion extends to the end face of the inner ring with a slight axial clearance therebetween.

  A wheel bearing device with a rotational speed detection device according to the present invention has a vehicle body mounting flange integrally attached to a suspension device on the outer periphery, and an outer member having a double row outer raceway formed on the inner periphery. , A hub wheel integrally having a wheel mounting flange for mounting a wheel at one end thereof, and having a cylindrical small diameter step portion extending in the axial direction on the outer periphery, and an inner ring press-fitted into the small diameter step portion of the hub ring An inner member in which an inner rolling surface facing the outer rolling surface of the double row is formed on the outer periphery, and freely rollable between the rolling surfaces of the outer member and the inner member. An accommodated double row rolling element, an encoder fitted on the inner ring, an annular sensor holder mounted on the end of the outer member so as to face the encoder, and an integral part of the sensor holder Molded, and the encoder has a predetermined radial direction. In the wheel bearing device with a rotational speed detection device provided with a rotational speed sensor facing each other, the encoder has an annular shape, and the characteristics in the circumferential direction change alternately and at equal intervals. The seal is disposed on the inboard side of the encoder, and the seals are mounted on the sensor holder and the inner ring, respectively, and are arranged from the annular first and second seal plates disposed opposite to each other. Since the encoder is provided integrally with the second seal plate, even in the state before the outer joint member is fitted into the hub wheel, including when it is transported to the assembly line of the automobile finished product manufacturer, Also, even during actual running, which is a harsh environment, it is possible to reliably prevent foreign matter such as magnetic powder from entering between the encoder and the detection unit of the rotation speed sensor. It can be. Therefore, the reliability of detecting the rotational speed of the wheel can be significantly improved.

  A vehicle body mounting flange for mounting to a suspension device on the outer periphery is integrated, an outer member having a double row outer rolling surface formed on the inner periphery, and a wheel mounting flange for mounting a wheel on one end is integrated. A hub wheel having one inner rolling surface facing the outer rolling surface of the double row on the outer periphery, and a cylindrical small diameter step portion extending in an axial direction from the inner rolling surface, and the hub An inner member comprising an inner ring press-fitted into a small-diameter step portion of the ring and formed with the other inner rolling surface facing the outer rolling surface of the double row, and each of the outer member and the inner member A double row rolling element accommodated between the rolling surfaces so as to roll freely, an encoder externally fitted to the inner ring, and an annular shape mounted on the end of the outer member so as to face the encoder A sensor holder and the encoder that is integrally molded with the sensor holder In a wheel bearing device with a rotation speed detection device provided with a rotation speed sensor facing each other through a predetermined radial clearance, the encoder has an annular shape, and magnetic substance powder is mixed therein so that magnetic poles N are alternately arranged in the circumferential direction. , S comprises a magnetized magnetic encoder, and a seal is disposed on the inboard side of the magnetic encoder. The seals are respectively attached to the sensor holder and the inner ring, and are arranged in an annular shape facing each other. The magnetic encoder includes a first and a second seal plate, and the magnetic encoder is integrally vulcanized and bonded to the second seal plate.

Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.
FIG. 1 is a longitudinal sectional view showing a first embodiment of a wheel bearing device with a rotational speed detection device according to the present invention, and FIG. 2 is an enlarged view of a main part of FIG. In the following description, the side closer to the outer side 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).

This wheel bearing device with a rotational speed detection device is for a drive wheel and has a so-called third generation configuration in which the hub wheel 1 and the double row rolling bearing 2 are unitized.
The double-row rolling bearing 2 includes an outer member 4, an inner member 3, and double-row rolling elements (balls) 5 and 5, and the outer member 4 has carbon 0.40 to 0. It is made of medium carbon steel containing 80 wt%, and integrally has a vehicle body mounting flange 4b for mounting to the knuckle N on the outer periphery. Double rows of outer rolling surfaces 4a and 4a are formed on the inner periphery, and a hardened layer is formed with a surface hardness in the range of 54 to 64 HRC by induction hardening.

  On the other hand, the hub wheel 1 integrally has a wheel mounting flange 7 for mounting a wheel (not shown) at an end portion on the outboard side, and a hub bolt 7a is planted at a circumferentially equidistant position of the wheel mounting flange 7. It is installed. Further, on the outer periphery, one inner rolling surface 1a facing the double row outer rolling surfaces 4a, 4a and a cylindrical small-diameter step portion 1b extending in the axial direction from the inner rolling surface 1a are formed. Yes. And the crimping part 8 is formed by carrying out the plastic deformation of the edge part of this small diameter step part 1b to radial direction outward. The inner ring 6 is press-fitted into the small-diameter step portion 1b, and the other inner rolling surface 6a facing the double-row outer rolling surfaces 4a and 4a is formed on the outer periphery thereof. Further, the inner ring 6 is fixed in the axial direction with respect to the hub wheel 1 by the caulking portion 8 to form a so-called self-retain structure. As a result, it is not necessary to control the preload by tightening firmly with a nut or the like as in the prior art, so that the weight and size can be reduced and the strength and durability of the hub wheel 1 can be improved and long. The amount of preload can be maintained for a period. Here, the inner member 3 refers to the hub wheel 1 and the inner ring 6 press-fitted into the hub wheel 1.

  Double row rolling elements 5, 5 are accommodated between outer rolling surfaces 4a, 4a of outer member 4 and double row inner rolling surfaces 1a, 6a facing these, respectively, by retainers 9, 9. It is held freely rolling. Further, seals 10 and 11 are attached to the end portion of the outer member 4 to prevent leakage of the lubricating grease sealed inside the bearing and intrusion of rainwater, dust and the like into the bearing from the outside.

  The hub wheel 1 is made of medium carbon steel containing 0.40 to 0.80 wt% of carbon such as S53C, and the like from the seal land portion to which the seal 10 on the outboard side is in sliding contact to the inner rolling surface 1a and the small diameter step portion 1b. Thus, a hardened layer is formed with a surface hardness in the range of 54 to 64 HRC by induction hardening. Note that the caulking portion 8 is an unquenched portion having a material surface hardness of 25 HRC or less after forging. As a result, the seal land which is the base of the wheel mounting flange 7 not only has improved wear resistance, but also has sufficient mechanical strength against the rotational bending load applied to the wheel mounting flange 7. The durability of 1 is further improved. In addition, the workability when plastically deforming the caulking portion 8 is improved, and the occurrence of cracks and the like during processing is prevented, and the reliability of the quality is improved.

  A serration (or spline) 1c is formed on the inner periphery of the hub wheel 1, and an outer joint member 12 constituting a constant velocity universal joint is fitted through the serration 1c. The shoulder portion 13 of the outer joint member 12 is abutted against the caulking portion 8 of the hub wheel 1 and is fixed integrally with the hub wheel 1 in the axial direction by a fixing nut 14.

  In the present embodiment, as shown in an enlarged view in FIG. 2, the sensor holder 15 formed in an annular shape is attached to the end of the outer member 4, and is coupled to the fitting ring 16 and the fitting ring 16. And holding part 17. The fitting ring 16 includes a cylindrical fitting portion 16a that is press-fitted into the outer periphery of the outer member 4, a flange portion 16b that extends radially inward from the fitting portion 16a, and an axial direction from the flange portion 16b. The cylindrical portion 16c extends, and the whole is formed in an annular shape. The fitting ring 16 is formed by pressing a corrosion-resistant stainless steel plate or the like. Further, perforations 18 are formed at a plurality of locations in the circumferential direction of the cylindrical portion 16c, and the holding portion 17 is integrally molded with a synthetic resin. The sensor holder 15 is attached to the end portion of the outer member 4 with the flange portion 16 b of the fitting ring 16 being in close contact with the end surface of the outer member 4, and the seal 11 is inboard of the sensor holder 15. It is arranged on the side.

  A rotation speed sensor 20 is embedded in the holding portion 17 so as to face a magnetic encoder 19 described later via a predetermined radial clearance. The rotational speed sensor 20 incorporates a magnetic detection element that changes its characteristics according to the flow direction of magnetic flux, such as a Hall element, a magnetoresistive element (MR element), and a waveform shaping circuit that adjusts the output waveform of the magnetic detection element. It consists of IC.

  The inboard side seal 11 is attached to the sensor holder 15 and the inner ring 6 respectively, and is composed of annular first and second seal plates 21 and 22 each having a substantially L-shaped cross section. ing. The second seal plate 22 includes a cylindrical portion 22a fitted on the inner ring 6, a cylindrical large-diameter step portion 22b extending in the axial direction from the cylindrical portion 22a, and a radially outward portion from the large-diameter step portion 22b. And a standing plate portion 22c extending in the vertical direction. An annular tongue piece 22d protrudes in the axial direction at the tip of the upright plate portion 22c, and opposes the cylindrical portion 16c of the sensor holder 15 with a slight radial clearance to constitute a labyrinth seal 23. . The second seal plate 22 is formed by pressing 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). Has been.

  On the other hand, the first seal plate 21 includes a cylindrical portion 21a fitted in the sensor holder 15 and a standing plate portion 21b extending radially inward from one end of the cylindrical portion 21a. A seal member 24 integrally having 24b and an intermediate lip 24c is vulcanized and bonded. The seal member 24 is made of an elastic member such as rubber.

  Here, the side lip 24 a is in sliding contact with the upright plate portion 22 c of the second seal plate 22, and the grease lip 24 b and the intermediate lip 24 c are in sliding contact with the large diameter step portion 22 b of the second seal plate 22. A magnetic encoder 19 in which magnetic powder such as ferrite is mixed in an elastomer such as rubber is integrally vulcanized and bonded to the outer peripheral surface of the cylindrical portion 22a of the second seal plate 22. This magnetic encoder 19 is magnetized with magnetic poles N and S alternately in the circumferential direction, and constitutes a rotary encoder for detecting the wheel rotational speed.

  Thus, in this embodiment, the rotational speed sensor 20 is disposed in the annular sensor holder 15, the seal 11 is disposed on the inboard side of the rotational speed sensor 20, and further, the seal 11 Since the labyrinth seal 23 is configured on the inboard side, even in a state before the outer joint member 12 is internally fitted to the hub wheel 1 including when being transported to the assembly line of a finished automobile manufacturer, Even during actual running as an environment, foreign matter such as magnetic powder can be reliably prevented from entering between the magnetic encoder 19 and the detection unit of the rotation speed sensor 20 from the outside. Therefore, the reliability of detecting the rotational speed of the wheel can be significantly improved. Further, the radial direction can be reduced, the surroundings of the rotation speed sensor 20 and the like can be simplified, and the assembly workability is further improved.

  In the present embodiment, as an example of the rotational speed detection apparatus, an active type rotational speed detection apparatus including the magnetic encoder 19 and the rotational speed sensor 20 including a magnetic detection element such as a Hall element is illustrated. The rotational speed detection device is not limited to this, and may be, for example, a passive type composed of a magnetic encoder, a magnet, and an annular coil wound around.

  FIG. 3 is an enlarged view of a main part showing a second embodiment of the wheel bearing device with a rotation speed detection device according to the present invention. In this embodiment, only the configuration of the labyrinth seal is different from that of the above-described embodiment, and other parts that are the same, the same parts, or the same function are denoted by the same reference numerals and detailed description thereof is omitted.

  The inboard side seal 11 ′ is mounted on the outer member 4 and the inner ring 6, and includes annular first and second seal plates 21, 22 ′ having a substantially L-shaped cross section and facing each other. Are arranged. The second seal plate 22 ′ includes a cylindrical portion 22a fitted on the inner ring 6, a cylindrical large-diameter step portion 22b extending in the axial direction from the cylindrical portion 22a, and a radially outer portion from the large-diameter step portion 22b. And a standing plate portion 22c extending in the direction. The upright plate portion 22c and the cylindrical portion 21a of the first seal plate 21 are opposed to each other through a slight radial clearance to form a labyrinth seal 26.

  Here, a shield 25 is disposed further on the inboard side of the seal 11 '. The shield 25 includes a first cylindrical portion 25a fitted into the sensor holder 15, a standing plate portion 25b extending radially inward from the first cylindrical portion 25a, and a first plate portion 25b extending in the axial direction from the standing plate portion 25b. It consists of two cylindrical portions 25c and has a substantially U-shaped cross section. The upright plate portion 25b and the upright plate portion 22c of the second seal plate 22 'are opposed to each other through a slight axial clearance to form a labyrinth seal 27. Further, the standing plate portion 25b of the shield 25 and the shoulder portion 13 of the outer joint member 12 are opposed to each other through a slight radial clearance to constitute a labyrinth seal 28.

  Thus, in the present embodiment, the shield 25 is disposed on the inboard side of the seal 11 ′, and in addition to the labyrinth seal 26 of the seal 11 ′, the labyrinth seal 27 and the shield 25 and the outer joint member 12 are interposed therebetween. Since the labyrinth seals 28 are respectively configured between the shoulder portions 13, even in a state before the outer joint member 12 is fitted inside the hub wheel 1, including during transportation to the assembly line of the automobile finished product manufacturer, In addition, even during actual running, which is a harsh environment, foreign matter such as magnetic powder can be reliably prevented from entering between the magnetic encoder 19 and the detection unit of the rotation speed sensor 20 from the outside.

  FIG. 4 is an enlarged view of a main part showing a third embodiment of a wheel bearing device with a rotational speed detection device according to the present invention. This embodiment is a modification of the above-described embodiment (FIG. 3), except that the shape of the shield is different, and other parts having the same function, the same parts, or the same function are denoted by the same reference numerals. Detailed description is omitted.

  A shield 29 is disposed further on the inboard side of the seal 11 '. The shield 29 includes a first cylindrical portion 29a fitted in the sensor holder 15, a standing plate portion 29b extending radially inward from the first cylindrical portion 29a, and a first extending axially from the standing plate portion 29b. It consists of two cylindrical parts 29c, and has a substantially U-shaped cross section. And the 2nd cylindrical part 29c of this shield 29, the shoulder part 13 of the outer joint member 12, and the end surface of the inner ring | wheel 6 oppose through a slight clearance, and the labyrinth seals 28 and 30 are comprised, respectively.

  Thus, in the present embodiment, the shield 29 is disposed on the inboard side of the seal 11 ′, and in addition to the labyrinth seal 26 of the seal 11 ′, the shield 29, the shoulder 13 of the outer joint member 12, and the inner ring 6 are provided. Since the labyrinth seals 28 and 30 are respectively formed between the end surface of the hub wheel 1 and the outer joint member 12 in the state before being fitted into the hub wheel 1, including when being transported to the assembly line of the finished vehicle manufacturer. Moreover, even during actual running, which is a harsh environment, foreign matter such as magnetic powder can be reliably prevented from entering between the magnetic encoder 19 and the detection unit of the rotation speed sensor 20 from the outside.

  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 section showing a 1st embodiment of a bearing device for wheels concerning the present invention. It is a principal part enlarged view same as the above. It is a principal part enlarged view which shows 2nd Embodiment of the wheel bearing apparatus which concerns on this invention. It is a principal part enlarged view which shows 3rd Embodiment of the wheel bearing apparatus which concerns on this invention. It is a longitudinal cross-sectional view which shows the conventional wheel bearing apparatus. It is a principal part enlarged view same as the above.

Explanation of symbols

1 ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ Hub wheel 1a, 6a ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ Inner rolling surface 1b ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・・ ・ ・ ・ Small diameter step 1c ・ ・ ・ ・ ・ ・ Serration 2 ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ Double row rolling bearing 3 ... Inner member 4 ... Outer member 4a ... · · Outer rolling surface 4b ········· Body mounting flange 5 ············ Rolling element 6・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ Inner ring 7 ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ Wheel mounting flange 7a ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ Hub bolt 8・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ Clamping section 9 ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ Cage 10 ············· Outboard side seal 11, 11 '・ Outer joint 13 ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ Shoulder 14 ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ Fixing nut 15 ・ ・ ・ ・ ・ ・······· Sensor holder 16 ····················································································· ········· 16c, 21a ·········································································・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ Perforation 19 ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ Magnetic encoder 20 ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ Rotational speed sensor 21 ........... first seal plates 21b, 22c 25b, 29b ················································· 2nd seal plate 22b ... tongue pieces 23, 26, 27, 28, 30 ... labyrinth seal 24 ... seal member 24a ...・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ Side lip 24b ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ Grease lip 24c ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ Intermediate lip 25, 29... Shield 25a, 29a... First cylindrical portion 25c, 29c. ..... Outer member 51a ... Outer rolling surface 51b ...・ Body mounting flange 52 ..... Inner member 53 ..... Rolling element 54 ..... Wheel mounting flange 54a ··············································································· Hub Rings 55a, 56a 55b ... Small diameter step 55c ... Serration 56 ... Inner ring 57 ... Cage 58, 59 ... Seal 60 ... -Outer joint member 61 ... Stem portion 62 ... First seal plate 63 ... ..... Second seal plate 63a ...・ Cylindrical part 63b ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ Standing plate part 64 ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ Magnetic encoder 65 ・ ・ ・ ・ ・ ・··· Core 66 ············· Sealing member 66a ···················· Side lips 66b and 66c ··· Radial lip 67 ... Fitting cylinder 67a ... Fitting cylinder part 67b ... ... Inward collar 68 ... Holding part 69 ... Sensor holder 70・ ・ ・ ・ ・ ・ ・ ・ ・ ・ Rotational speed sensor 71 ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ Micro gap N ・ ・ ・ ・ ・ ・ ・ ・···knuckle

Claims (6)

An outer member integrally having a vehicle body mounting flange for mounting to a suspension device on the outer periphery, and a double row outer rolling surface formed on the inner periphery;
A hub ring 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 an inner ring press-fitted into the small-diameter step portion of the hub ring; An inner member formed on the outer periphery with an inner rolling surface facing the outer rolling surface of the double row,
A double row rolling element housed so as to be freely rollable between the rolling surfaces of the outer member and the inner member;
An encoder externally fitted to the inner ring, and an annular sensor holder attached to an end of the outer member so as to face the encoder;
In the wheel bearing device with a rotational speed detection device, which is integrally molded with the sensor holder and includes a rotational speed sensor facing the encoder via a predetermined radial clearance,
The encoder has an annular shape, and the characteristic in the circumferential direction changes alternately and at equal intervals, and a seal is disposed on the inboard side of the encoder. And an annular first seal plate and a second seal plate disposed opposite to each other, and the encoder is provided integrally with the second seal plate. Wheel bearing device with detection device.   The sensor holder includes a steel-made fitting ring and a holding part integrally molded with the fitting ring, and the fitting ring is press-fitted into the outer periphery of the outer member. And a flange that extends radially inward from the fitting portion and is in close contact with the end face of the outer member, and a cylindrical portion that extends in the axial direction from the flange, and the cylindrical portion includes the first portion The wheel bearing device with a rotational speed detection device according to claim 1, wherein a seal plate is fitted therein.   The second seal plate is externally fitted to the inner ring, and a cylindrical portion in which the encoder is integrally provided on an outer peripheral surface thereof, a cylindrical large-diameter step portion extending in an axial direction from the cylindrical portion, The rotational speed according to claim 1 or 2, wherein a labyrinth seal is formed at a distal end portion of the standing plate portion, which is formed in a substantially L-shaped section having a standing plate portion extending radially outward from the radial step portion. Wheel bearing device with detection device.   A shield having a substantially U-shaped cross section is disposed further on the inboard side of the seal, and a labyrinth seal is configured by making the shield face the shoulder of the outer joint member via a slight radial clearance. The wheel bearing apparatus with a rotational speed detection apparatus in any one of 1 thru | or 3.   The shield includes a first cylindrical portion fitted in the sensor holder, a standing plate portion extending radially inward from the first cylindrical portion, and a second cylindrical portion extending in the axial direction from the standing plate portion. The wheel bearing device with a rotational speed detection device according to claim 4, wherein a labyrinth seal is configured by causing the standing plate portion to face the second seal plate via a slight axial clearance.   The shield includes a first cylindrical portion fitted in the sensor holder, a standing plate portion extending radially inward from the first cylindrical portion, and a second cylindrical portion extending in the axial direction from the standing plate portion. The wheel bearing device with a rotational speed detection device according to claim 4, wherein a labyrinth seal is configured by causing the second cylindrical portion to face the end surface of the inner ring via a slight axial clearance.

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