JP4628053B2 - Wheel bearing device with rotation speed detector - Google Patents

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 the air gap adjustment work between the rotation speed sensor and the magnetic encoder and to achieve further compactness, recently, a bearing apparatus for a wheel with a rotation speed detection device in which the rotation speed sensor is also incorporated in the bearing. Has been proposed.

  A structure as shown in FIG. 6 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. 7, 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 formed in 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. A 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 tube 67 includes a fitting tube portion 67a and an inward flange portion 67b extending radially inward from the fitting tube portion 67a, and is formed in an annular shape as a whole 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 rotational speed sensor 70 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 the magnetic flux, and a waveform shaping circuit that adjusts the output waveform of the magnetic detecting 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 capable of preventing foreign matter such as magnetic powder from entering between the magnetic encoder 64 and the detection unit of the rotational speed sensor 70. Then, it is inevitable that foreign matter such as dust or magnetic powder enters from the outside between the magnetic encoder 64 and the detection unit of the rotation speed sensor 70 during actual running, which is a severe environment. Such foreign matter may wear the magnetic encoder 64 and damage the detection portion 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 includes an outer member having a double row outer rolling surface formed on the inner periphery, and a wheel mounting flange for mounting the wheel at one end. A hub ring integrally formed with a cylindrical small-diameter stepped 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, and the double row outer rolling on the outer periphery An inner member in which an inner rolling surface facing the surface is formed, and a double row rolling element that is slidably accommodated between the inner member and the outer member. An annular sensor holder attached to the end of the outer member, a rotational speed sensor integrally molded with the sensor holder, and an outer fit on the inner ring, with a predetermined air gap passing through the rotational speed sensor. Oppositely, magnetic powder is mixed and magnetic poles N and S are alternately attached in the circumferential direction. In the wheel bearing device with a rotational speed detection device having the magnetic encoder, the magnetic encoder and the rotational speed sensor are arranged with a predetermined inclination angle, and the in-board side of the magnetic encoder is interposed via the sensor holder. A seal is disposed, and the seal is composed of annular first and second seal plates that are respectively mounted on the sensor holder and the inner ring so as to face each other, and the sensor holder is made of a steel-made fitting ring. And a holding portion integrally molded with the fitting ring, and the fitting ring is press-fitted into the outer periphery of the outer member, and the fitting portion is radially inward from the fitting portion. extending towards the flange portion which is in close contact with the end face of the outer member, from this flange portion consists of a cylindrical portion extending in the axial direction, said first sealing plate is fitted into the cylindrical portion, the magnetic ene Over Da and the rotation speed sensor, by being disposed on the outboard side of the seal adopts the arrangement that the inside bearing in the seal magnetic encoder and the rotational speed sensor is sealed from the outside.

Thus, in the wheel bearing device with a rotation speed detection device of the inner ring rotation type, the magnetic encoder and the rotation speed sensor are arranged with a predetermined inclination angle, and a seal is provided on the inboard side of the magnetic encoder via the sensor holder. The seal holder is composed of annular first and second seal plates which are respectively mounted on the sensor holder and the inner ring so as to face each other, and the sensor holder includes a steel plate fitting ring and this fitting. A holding part integrally molded with the ring, and a fitting ring that is press-fitted into the outer periphery of the outer member, and extends radially inward from the fitting part. a flange portion which is in close contact with the end face of the member consists of a cylindrical portion extending from the flange portion in the axial direction, the cylindrical portion first seal plate is fitted into the magnetic encoder and the rotational speed sensor, the seal Autobo By being arranged on the side, since the magnetic encoder and the rotational speed sensor in the bearing in the seal is sealed from the outside, the magnetic flux density is substantially in its volume by the inclination of the magnetized part of the magnetic encoder is increased The air gap with the rotation speed sensor can be set large, the degree of freedom in design is improved, and the assembly work can be simplified. In addition, the magnetic encoder and rotational speed can be used even before the outer joint member is fitted into the hub wheel, including during transportation to the assembly line of a finished automobile manufacturer, and even during actual driving in a harsh environment. It is possible to reliably prevent foreign matters such as magnetic powder from entering between the sensor detection unit and the outside. Therefore, the reliability of wheel rotation speed detection can be significantly improved.

According to a second aspect of the present invention, the second seal plate has a substantially L-shaped cross section having a cylindrical portion that is externally fitted to the inner ring and a standing plate portion that extends radially outward from the cylindrical portion. The labyrinth seal is formed with the tip of the upright plate portion opposed to the first seal plate or the sensor holder via a slight radial clearance, thereby further improving the sealing performance and rotating The reliability of speed detection can be improved.

Preferably, as in the invention described in claim 3 , if the cylindrical portion of the second seal plate projects outwardly from the large end surface of the inner ring to the inboard side, the width of the inner ring is required. It can be minimized, and it is possible to further improve the fuel efficiency and performance of the vehicle by further promoting the reduction in weight and size of the wheel bearing device.

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

The wheel bearing device with a rotational speed detection device according to the present invention integrally has an outer member having a double row outer raceway formed on the inner periphery and a wheel mounting flange for mounting the wheel at one end. A hub wheel 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 wheel, and facing the outer circumferential rolling surface of the double row on the outer periphery. An inner member on which an inner rolling surface is formed; and a double row rolling element that is slidably accommodated between the rolling surfaces of the inner member and the outer member. An annular sensor holder attached to the end of the sensor, a rotation speed sensor integrally molded with the sensor holder, and an outer fit to the inner ring, and facing the rotation speed sensor through a predetermined air gap, Circumferential characteristics change alternately and at equal intervals In the wheel bearing device with a rotational speed detection device having the magnetic encoder configured as described above, the magnetic encoder and the rotational speed sensor are arranged with a predetermined inclination angle, and the sensor holder is disposed on the inboard side of the magnetic encoder. A seal is provided, and the seal is composed of annular first and second seal plates that are respectively mounted on the sensor holder and the inner ring so as to be opposed to each other. The fitting ring includes a holding portion integrally molded with the fitting ring, and the fitting ring is pressed into the outer periphery of the outer member. extends inward, and the flange portion which is in close contact with the end face of the outer member, from this flange portion consists of a cylindrical portion extending in the axial direction, said first sealing plate is fitted into the cylindrical portion, wherein Magnetism Encoder and rotational speed sensors, by being disposed on the outboard side of the seal, since the inside bearing in the seal magnetic encoder and the rotational speed sensor is sealed from the outside, the volume of the magnetized magnetic encoder As a result, the magnetic flux density can be substantially increased, the air gap with the rotational speed sensor can be set large, the degree of freedom in design is improved, and the assembly work can be simplified. In addition, the magnetic encoder and rotational speed can be used even before the outer joint member is fitted into the hub wheel, including during transportation to the assembly line of a finished automobile manufacturer, and even during actual driving in a harsh environment. It is possible to reliably prevent foreign matters such as magnetic powder from entering between the sensor detection unit and the outside. Therefore, the reliability of wheel rotation speed detection 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 An annular sensor holder mounted on an end of the outer member, and a rotation speed sensor integrally molded with the sensor holder. And a predetermined air gear on the rotation speed sensor. In the wheel bearing device with a rotational speed detection device, wherein the magnetic encoder and the rotational speed sensor have a magnetic encoder configured to alternately and equally change characteristics in the circumferential direction. Are arranged with a predetermined inclination angle, and a seal is disposed on the inboard side of the magnetic encoder via the sensor holder, and the seals are respectively attached to the sensor holder and the inner ring, and are disposed to face each other. And the sensor holder includes a steel-made fitting ring and a holding portion integrally molded with the fitting ring, and the fitting ring includes the fitting ring and the fitting 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 is in close contact with the end surface of the outer member, and an axial direction from the flange portion Consists of a extending cylindrical portion, the said the cylindrical portion first seal plate is fitted in the magnetic encoder and the rotational speed sensor, by being arranged on the outboard side of the seal, the bearing inside the seal The magnetic encoder and the rotational speed sensor are sealed from the outside .

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. Here, the inner member 3 refers to the hub wheel 1 and the inner ring 6 press-fitted into the hub wheel 1.

  The outer member 4 is made of medium carbon steel containing 0.40 to 0.80 wt% of carbon such as S53C, 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 58 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, there are formed an inner rolling surface 1a on the outboard side 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. Has been. 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 an inboard-side 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 and has a so-called self-retaining 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.

  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 58 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 that 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 outer joint member 12 has a shoulder portion 13 abutted against the crimped portion 8 of the hub wheel 1, and the hub wheel 1 and the outer joint member 12 are detachably integrally fixed by a fixing nut 14 in the axial direction. .

  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 portion of the outer member 4. The sensor holder 15 includes a fitting ring 16 and a holding portion 17 coupled to the fitting ring 16. 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 a shaft that extends from the flange portion 16b. It consists of the cylindrical part 16c extended in the direction, and is formed in the annular | circular shape as a whole. The fitting ring 16 is formed by pressing a corrosion-resistant stainless steel plate or the like. In particular, the fitting ring 16 is formed of a non-magnetic steel plate, for example, an austenitic stainless steel plate (JIS standard SUS304 or the like) so as not to adversely affect the sensing performance of the rotational speed sensor 20 described later. Is preferred.

  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 press-fitted and fixed to the end portion of the outer member 4 while the seal 11 is fitted into the cylindrical portion 16 c of the sensor holder 15 and the flange portion 16 b is in close contact with the end surface of the outer member 4. Has been. As a result, the radial direction can be reduced, the surroundings of the rotational speed sensor 21 and the like can be simplified, and the assembling workability can be further improved.

  On the other hand, a steel plate base 19 is press-fitted into the outer diameter of the inner ring 6. The base 19 is pressed from 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 processing. And it consists of the cylindrical part 19a press-fit in the inner ring | wheel 6, and the standing board part 19b which inclines and extends in the radial direction outward from this cylindrical part 19a. Further, a magnetic encoder 20 in which a magnetic substance powder such as ferrite is mixed in an elastomer such as rubber is integrally vulcanized and bonded to the side surface on the inboard side of the standing plate portion 19b. The magnetic encoder 20 has magnetic poles N and S alternately magnetized in the circumferential direction, and constitutes a rotary encoder for detecting the rotational speed of the wheel.

  The holding unit 17 is embedded with a rotation speed sensor 21 facing the magnetic encoder 20 through a predetermined air gap in an inclined state. The rotation speed sensor 21 incorporates a magnetic detection 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 the magnetic detection element. It consists of IC.

  In this embodiment, since the standing plate portion 19b to which the magnetic encoder 20 is bonded is formed to be inclined, the volume of the magnetized portion is increased, and the magnetic flux density can be substantially increased. As a result, it is possible to set a large air gap with the rotation speed sensor 21, improving the degree of freedom in design and simplifying the assembling work. In addition, this inclination makes it possible to reduce the cross-sectional height of the sensor holder 15 itself, and the bearing portion can be made compact.

  The inclination angles of the magnetic encoder 20 and the rotation sensor 21 described above are set in the range of 20 to 45 ° with respect to the vertical line. This is because if the inclination angle is less than 20 °, the effect of inclining cannot be expected, and if it exceeds 45 °, an axial space is required and it is not preferable.

  The inboard-side seal 11 is mounted on the sensor holder 15 and the inner ring 6 respectively, and is composed of annular first and second seal plates 22 and 23 having a substantially L-shaped cross section, and they are arranged facing each other. Has been. The second seal plate 23 includes a cylindrical portion 23a that is fitted on the inner ring 6 and a standing plate portion 23b that extends radially outward from the cylindrical portion 23a. An annular tongue piece 23c projects in the axial direction at the tip of the upright plate portion 23b, and a labyrinth seal 24 is configured to face the cylindrical portion 16c of the sensor holder 15 with a slight radial clearance. . The second seal plate 23 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). Has been.

  On the other hand, the first seal plate 22 includes a cylindrical portion 22a fitted in the sensor holder 15 and a standing plate portion 22b extending radially inward from one end of the cylindrical portion 22a. A seal member 25 integrally having 25b and an intermediate lip 25c is bonded by vulcanization. The seal member 25 is made of an elastic member such as rubber.

  Thus, in the present embodiment, the rotational speed sensor 21 is disposed in the annular sensor holder 15, and the seal 11 is fitted on the inboard side of the rotational speed sensor 21, and further, the seal 11 Since the labyrinth seal 24 is formed on the inboard side, even in a state before the outer joint member 12 is fitted into the hub wheel 1 including when it is transported to the assembly line of the automobile finished product manufacturer, Even during actual running as an environment, foreign matter such as magnetic powder can be reliably prevented from entering between the magnetic encoder 20 and the detection unit of the rotation speed sensor 21 from the outside. Therefore, the reliability of detecting the rotational speed of the wheel can be significantly improved.

  Here, as an example of the rotational speed detection device, an active type rotational speed detection device including a magnetic encoder 20 and a rotational speed sensor 21 including a magnetic detection element such as a Hall element is illustrated. However, the rotational speed detection device according to the present invention is exemplified. The apparatus is not limited to this, and may be, for example, a passive type including a magnetic encoder, a magnet, and an annular coil wound around.

  FIG. 3 is a longitudinal sectional view showing a second embodiment of the wheel bearing device with a rotational speed detection device according to the present invention. Note that this embodiment is basically the same as the above-described embodiment (FIG. 1) except for the inboard side seal mounting portion, and the same for other parts having the same function, the same parts, or the same function. Reference numerals are assigned and detailed description thereof is omitted.

  The inboard seal 11 in this embodiment is the same as that in the above-described embodiment, but the configuration of the mounting portion is different. That is, the seal 11 is mounted on the sensor holder 15 and the inner ring 6 ′, and the cylindrical portion 22a of the second seal plate 22 is mounted so as to protrude to the inboard side from the large end surface 6b of the inner ring 6 ′. Yes. Thereby, the width dimension of the inner ring 6 'can be suppressed to the minimum necessary, and the inner ring 6' can be formed substantially narrower than the inner ring 6 described above. Therefore, it is possible to further reduce the weight and size of the wheel bearing device, and to improve the fuel consumption and performance of the vehicle (shown by broken lines in the figure).

  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 basically differs from the second embodiment (FIG. 3) described above only in the configuration of the labyrinth seal, and the same reference numerals are used for the same parts, the same parts, or parts having the same function. The detailed description is omitted.

  The inboard side seal 11 ′ is mounted on the outer member 4 and the inner ring 6, and is composed of annular first and second seal plates 22, 23 ′ having a substantially L-shaped cross section and facing each other. Are arranged. The second seal plate 23 ′ includes a cylindrical portion 23 a that is fitted on the inner ring 6 ′ and a standing plate portion 23 b that extends radially outward from the cylindrical portion 23 a. The upright plate portion 23b and the cylindrical portion 22a of the first seal plate 22 face each other through a slight radial clearance, and a labyrinth seal 26 is configured.

  Here, a shield 27 is disposed further on the inboard side of the seal 11 ′. The shield 27 includes a first cylindrical portion 27a fitted in the sensor holder 15, a standing plate portion 27b extending radially inward from the first cylindrical portion 27a, and a first plate portion 27b extending in the axial direction from the standing plate portion 27b. It consists of two cylindrical portions 27c, and has a substantially U-shaped cross section. The standing plate portion 27b and the standing plate portion 23b of the second seal plate 23 'are opposed to each other with a slight axial clearance to form a labyrinth seal 28. Further, the second cylindrical portion 27c of the shield 27 and the shoulder portion 13 of the outer joint member 12 are opposed to each other through a slight radial clearance to form a labyrinth seal 29.

  Thus, in this embodiment, the shield 27 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 28, the shield 27, and the outer joint member 12 are interposed therebetween. Since the labyrinth seals 29 are respectively formed between the shoulder portions 13, foreign matter such as magnetic powder can be further prevented from entering between the magnetic encoder 20 and the detection portion of the rotation speed sensor 21. Can do.

  FIG. 5 is an enlarged view of a main part showing a fourth embodiment of a wheel bearing device with a rotational speed detection device according to the present invention. Note that this embodiment is a modification of the above-described embodiment (FIG. 4), 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 30 is disposed further on the inboard side of the seal 11 '. The shield 30 includes a first cylindrical portion 30a fitted in the sensor holder 15, a standing plate portion 30b extending radially inward from the first cylindrical portion 30a, and a first plate portion 30b extending in the axial direction from the standing plate portion 30b. It consists of two cylindrical portions 30c and has a substantially U-shaped cross section. And the 2nd cylindrical part 30c of this shield 30, 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 29 and 31 are comprised, respectively.

  Thus, in the present embodiment, the shield 30 is disposed on the inboard side of the seal 11 ′, and in addition to the labyrinth seal 26 of the seal 11 ′, the shield 30 and the shoulder 13 of the outer joint member 12 and the inner ring 6 are provided. Since the labyrinth seals 29 and 31 are respectively formed between the end surface of 'and reliably, foreign matter such as magnetic powder enters from between the magnetic encoder 20 and the detection unit of the rotational speed sensor 21. Can be prevented.

  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. 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 longitudinal cross-sectional 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 principal part enlarged view which shows 4th 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 ·········· Double row rolling bearing 3・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ Outer member 4a ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ Outer rolling surface 4b ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・.... Body mounting flange 5 ... Rolling elements 6, 6 '...・ ・ ・ ・ ・ Inner ring 6b ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ Large end surface 7 ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ Wheel Mounting hula 7a ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ Hub Bolt 8 ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ Clamping part 9 ・ ・ ・・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ Retainer 10 ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ Outboard seal 11, 11 ′・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ Inboard side seal 12 ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ Outer joint member 13 ・ ・ ・ ・ ・ ・・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ Shoulder 14 ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ Fixing nut 15 ・ ・ ・ ・ ・ ・ ・ ・······· Sensor holder 16 ······························ Fitting ring 16a Fitting portion 16b ............. collars 16c, 19a, 22a, 23a ..・ Cylindrical part 17 ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ Holding part 18 ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ Perforation 19 ・ ・ ・・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ Base 19b, 22b, 23b, 27b, 30b ・ ・ Standing plate 20 ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・・ Magnetic encoder 21 ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ Rotational speed sensor 22 ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ First seal Plates 23, 23 '... 2nd seal plate 23c ... ... tongue pieces 24, 26 , 28, 29, 31 ... Labyrinth seal 25 ... Seal member 25a ...・ ・ ・ ・ Side lip 25b ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・・ ・ ・ ・ Grease lip 25c ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ Intermediate lip 27, 30 ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ Shield 27a, 30a ·························· First cylinder portion 27c, 30c ·················· the second cylinder portion 51・ ・ ・ ・ ・ ・ ・ ・ ・ Outer member 51a ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ Outside rolling surface 51b ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・.... Body mounting flange 52 ..... Inward member 53 ... Rolling element 54 ... Wheel mounting flange 54a ... Hub bolt 55 ... ............ Hub wheel 55a, 56a ...・ ・ ・ ・ ・ ・ ・ ・ ・ Inner rolling surface 55b ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ Small diameter step 55c ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・... serration 56 ... inner ring 57 ... cage 58, 59 ... Seal 60 ... Outer joint member 61 ...・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ Stem 62 ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ First seal plate 63 ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・... 2nd seal plate 63a ... ... Cylindrical part 63b ... ... Standing plate section 64 ... Magnetic encoder 65 ... ············ Core 66 ···························· Sealing member 66a ... ..Side lip 66b, 66c ... Radial lip 67 ... Fitting cylinder 67a ...・ ・ ・ ・ ・ ・ ・ ・ ・ ・ Fitting tube portion 67b ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ Inward flange 68 ・ ・ ・ ・ ・ ・ ・ ・・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ Holding part 69 ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ Sensor holder 70 ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・・ ・ ・ Rotational speed sensor 71 ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ Micro gap N ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・·knuckle

Claims (4)

An outer member having a double row outer raceway 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 movably between the rolling surfaces of the inner member and the outer member;
An annular sensor holder attached to an end of the outer member;
A rotational speed sensor integrally molded with the sensor holder;
A rotational speed having a magnetic encoder that is externally fitted to the inner ring, faces the rotational speed sensor via a predetermined air gap, and magnetic powder is mixed and magnetic poles N and S are alternately magnetized in the circumferential direction. In a wheel bearing device with a detection device,
The magnetic encoder and the rotational speed sensor are arranged with a predetermined inclination angle, and a seal is disposed on the inboard side of the magnetic encoder via the sensor holder, and the seal is attached to the sensor holder and the inner ring, respectively. The sensor holder is composed of a steel plate fitting ring and a holding part integrally molded with the fitting ring. A cylindrical fitting portion in which the fitting ring is press-fitted into the outer periphery of the outer member; and a flange portion extending radially inward from the fitting portion and in close contact with the end surface of the outer member; consists of a cylindrical portion extending from the flange portion in the axial direction, the said the cylindrical portion first seal plate is fitted in, by the magnetic encoder and the rotational speed sensor is arranged on the outboard side of the seal Wherein the inner bearing in the seal magnetic encoder and the rotational speed sensor the rotational speed detector equipped wheel support bearing assembly, characterized by being sealed from the outside.   The second seal plate is formed in a substantially L-shaped cross section having a cylindrical portion fitted on the inner ring and a vertical plate portion extending radially outward from the cylindrical portion, and the tip of the vertical plate portion The wheel bearing device with a rotational speed detection device according to claim 1, wherein a labyrinth seal is configured by facing the first seal plate or the sensor holder via a slight radial clearance.   3. The wheel bearing device with a rotation speed detection device according to claim 1, wherein a cylindrical portion of the second seal plate projects outwardly from the large end surface of the inner ring toward the inboard side. A shield having a substantially U-shaped cross section is disposed on the inboard side of the seal, and this shield is opposed to the shoulder portion of the outer joint member constituting the constant velocity universal joint through a slight radial clearance. The wheel bearing device with a rotational speed detection device according to any one of claims 1 to 3, wherein a seal is configured.

Images