JP2006105829A - Bearing device for wheel equipped with rotation speed detection device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a bearing device for a wheel equipped with a rotation speed detection device which prevents the entry of foreign substances into a detection section to improve durability and reliability and achieves light weight and compactification. <P>SOLUTION: The bearing device for a wheel equipped with a rotation speed detection device of the shaft washer rotation type includes an annular encoder 24 of which the circumferential characteristics change alternately at regular intervals. A seal 9 is arranged on the inboard side of the encoder 24. The seal 9 comprises an annular first seal plate 19 and a second seal plate 20 which are installed in a sensor holder 13 and the shaft washer 4, respectively, and are placed facing each other. The second seal plate 20 comprises a fitting cylinder part 20a which is externally fitted to the shaft washer 4, a large-diameter cylinder part 20b which is formed larger than the fitting cylinder part 20a, and an upright plate 20c which extends radially outwardly from the large-diameter cylinder part 20b, wherein the large-diameter cylinder part 20b is placed protruding on a large end face 4b of the shaft washer 4. <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.

  As a wheel bearing device with a rotational speed detecting device for detecting the rotational speed of a wheel by controlling an anti-lock brake system (ABS) while rotatably supporting the wheel of an automobile on a suspension device, various structures have been conventionally used. Things are 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. 3 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 knuckle N constituting a suspension device, and an outer member 51 serving as a fixing member, and double rows of balls 53 and 53 on the outer member 51. The outer member 51 has a body mounting flange 51b integrally formed on the outer periphery, and double rows of 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. The double-row balls 53 and 53 are respectively accommodated between the rolling surfaces and are held by the cages 57 and 57 so as to be freely rollable.

  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. A serration 55c is formed on the inner periphery of the hub wheel 55, and a stem portion 61 of an outer joint member 60 constituting a constant velocity universal joint (not shown) is fitted therein. 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.

  Here, a rotational speed detection device 62 including an encoder 63 and a sensor 64 is attached to an end portion of the outer member 51. As shown in an enlarged view in FIG. 4, the encoder 63 is made of a cylindrical plastic magnet 65 provided with magnetic poles that are alternately different in the circumferential direction, and a non-magnetic material that is integrally polymerized on the inner circumferential side. And a base 66.

  On the other hand, the sensor 64 is made of a Hall IC in which an IC chip is molded with a protective cover 67 made of synthetic resin. The protective cover 67 of the sensor 64 includes a rectangular parallelepiped main body 68 in which an IC chip is embedded, and an L-shaped locking piece 69 connected to the main body 68. It is formed to become. Further, a convex portion 69 a is provided on the inner surface of the locking piece 69, and the cord wire 70 is drawn from the upper surface of the main body portion 68. The sensor 64 is attached to the end of the outer member 51 via a support ring 71.

  The support ring 71 is made of an annular iron plate that is press-formed in a plurality of stages, and rises outward in the radial direction from the first cylindrical portion 72 that is press-fitted into the inner periphery of the end of the outer member 51. A first annular plate portion 73; a second cylindrical portion 74 connected to the outer end from the first annular plate portion 73; a second annular plate portion 75 falling radially inward from the second cylindrical portion 74; And a third cylindrical portion 76 extending in the axial direction from the two annular plate portions 75. A sensor pocket 77 penetrating in the radial direction is opened at one place in the circumferential direction of the second annular plate portion 74, and the second annular plate portion 75 is engaged with the sensor pocket 77. A hole 78 is provided. The main body 67 of the sensor 64 is inserted into the sensor pocket 77 of the support ring 71 from the radial direction, and the locking piece 69 is engaged with the engagement hole 78 of the support ring 71 and fixed.

  The seal 59 includes a first seal plate 79 having an L-shaped cross section, and a second seal plate 80 facing the first seal plate 79 and having an L-shaped cross section. The second seal plate 80 includes a cylindrical portion 80a that is externally fitted to the inner ring 56, and a standing plate portion 80b that extends radially outward from the cylindrical portion 80a.

  On the other hand, the first seal plate 79 is fitted into the third cylindrical portion 76 of the support ring 71, and a cored bar 81 having an L-shaped cross section is integrally bonded to the cored bar 81 by vulcanization. The side lip 82a is in sliding contact with the upright plate portion 80b of the second seal plate 80, and the sealing member 82 is formed of a pair of radial lips 82b and 82c in sliding contact with the cylindrical portion 80a.

As described above, since the support ring 71 is provided with the seal 59 on the outer side of the sensor 64, it is possible to prevent foreign matters from entering the gap between the encoder 63 and the sensor 64, The detection accuracy can be maintained high over a long period of time, and the sensor 64 is attached by being inserted in the radial direction with respect to the support ring 71, thereby preventing the relative position between the encoder 63 and the sensor 64 from shifting. And the detection accuracy can be maintained with high accuracy.
JP 2000-225931 A

  In such a conventional wheel bearing device with a rotational speed detection device, the support ring 71 is used only for the attachment of the sensor 64, and the inner ring 56 to be attached is used for the attachment of the encoder 63 without using the support ring or the like. Since it is extended and directly attached to it, the number of components can be reduced, and in the unlikely event that the support ring is deformed, the relative displacement between the encoder 63 and the sensor 64 is prevented. The detection accuracy can be maintained with high accuracy.

  However, in such a conventional wheel bearing device with a rotational speed detecting device, the sensor 64 and the encoder 63 are arranged opposite to each other in the radial direction to detect the rotational speed, so that the axial dimension of the encoder 63 inevitably increases. . As a result, the encoder 63 is externally fitted, and the width of the inner ring 56 that externally fits the cylindrical portion 80a of the second seal plate 80 that constitutes the seal 59 must be increased accordingly. There has been a problem that the light weight and compactness of the apparatus are hindered.

  The present invention has been made in view of such circumstances, and is equipped with a rotation speed detection device that prevents intrusion of foreign matter into the detection unit to improve durability and reliability, and is lightweight and compact. An object of the present invention is to provide a wheel bearing device.

  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. It has a hub ring with a small-diameter step portion formed on the outer periphery and extending in the axial direction on the outer periphery, and an inner ring press-fitted into the small-diameter step portion of this hub wheel, and is opposed to the outer surface of the double row on the outer periphery. An inner member formed with an inner rolling surface, a double-row rolling element housed between the inner member and the outer member so as to roll freely, and an outer fit to the inner ring An encoder, an annular sensor holder attached to the end of the outer member so as to face the encoder, and an integral mold formed on the sensor holder. The encoder is opposed to the encoder via a predetermined axial clearance. Rotational speed detection device having a rotational speed sensor In the bearing device for a wheel, the encoder has an annular shape, and the characteristic in the circumferential direction changes alternately and at equal intervals. A seal is provided on the inboard side of the encoder via the sensor holder. The seals are mounted on the sensor holder and the inner ring, respectively, and are composed of annular first and second seal plates arranged opposite to each other, and the second seal plate is fitted on the inner ring. A fitting cylindrical portion, a large-diameter cylindrical portion formed one step larger from the fitting cylindrical portion, and a standing plate portion extending radially outward from the large-diameter cylindrical portion, the large diameter A configuration is adopted in which the cylindrical portion is disposed so as to protrude from the large end surface of the inner ring.

  In this way, in the wheel bearing device with an inner ring rotation type rotational speed detection device, the encoder has an annular shape, and the characteristic in the circumferential direction changes alternately and at equal intervals. A seal is disposed on the board side via a sensor holder, the seals are respectively mounted on the sensor holder and the inner ring, and are composed of annular first and second seal plates disposed opposite to each other. A fitting cylindrical portion that is externally fitted to the inner ring, a large-diameter cylindrical portion that has a larger diameter than the fitting cylindrical portion, and a vertical plate portion that extends radially outward from the large-diameter cylindrical portion And the large-diameter cylindrical part is arranged so as to protrude from the large end surface of the inner ring, so that the encoder and the detection part of the rotation speed sensor are shut off from the outside by the sensor holder and the seal, resulting in a harsh environment In can also be securely prevented from foreign matters such as rainwater or dust or magnetic powder from the outside from entering. Therefore, the reliability of detecting the rotational speed of the wheel can be significantly improved.

  In addition, the axial dimension of the encoder can be shortened as compared with the conventional rotational speed detecting device that detects the rotational speed by arranging it oppositely in the radial direction, and the large-diameter cylindrical portion of the second seal plate is made of the inner ring. Even if it is disposed so as to protrude from the large end face, the rigidity of the second seal plate can be secured, the sealing performance can be maintained, and the width of the inner ring can be minimized. Therefore, the wheel bearing device can be reduced in weight and size, and the fuel efficiency and performance of the vehicle can be improved.

  In the invention according to 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 includes the outer member. A cylindrical fitting portion that is press-fitted into the outer periphery, 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 a cylindrical portion that extends in an axial direction from the flange portion Since the first seal plate is fitted into the cylindrical portion, the radial direction can be reduced, the surroundings of the rotation speed sensor and the like can be simplified, and the assembling workability can be further improved.

  Preferably, as in the invention described in claim 3, a plurality of perforations are formed in the cylindrical portion of the fitting ring, the holding portion is integrally molded, and the rotation speed sensor is embedded in the holding portion. If it is done, the assembly work of the rotational speed detection device can be simplified.

  Further, as in the invention described in claim 4, if the fitting ring is formed by press forming from a corrosion-resistant non-magnetic steel plate, the fitting ring adversely affects the sensing performance of the rotation speed sensor. The detection accuracy can be improved.

  Further, as in the fifth aspect of the invention, if a ring-shaped elastic member is elastically mounted in the annular space between the large-diameter cylindrical portion and the outer diameter of the inner ring, the fitting cylindrical portion and the inner ring are fitted. The sealing performance of the joint portion is remarkably improved, and rainwater or the like can be reliably prevented from entering the inside of the bearing from the outside over a long period of time.

  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. An inner ring that includes a hub wheel having a 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, and facing the double-row outer rolling surface on the outer periphery. An inner member having a surface formed thereon, a double-row rolling element that is rotatably accommodated between the rolling surfaces of the inner member and the outer member, and an encoder that is externally fitted to the inner ring. An annular sensor holder mounted on the end of the outer member so as to face the encoder, and a rotational speed sensor integrally molded with the sensor holder and facing the encoder via a predetermined axial clearance A vehicle with a rotation speed detection device In the bearing device, the encoder is formed in 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 via the sensor holder. The seal is mounted on the sensor holder and the inner ring, respectively, and is composed of annular first and second seal plates arranged opposite to each other, and the second seal plate is fitted on the inner ring. The large-diameter cylindrical portion includes a fitting cylindrical portion, a large-diameter cylindrical portion formed in a one-step large diameter from the fitting cylindrical portion, and a standing plate portion extending radially outward from the large-diameter cylindrical portion. Is arranged so as to protrude from the large end surface of the inner ring, so that the encoder and the detection unit of the rotation speed sensor are shut off from the outside by the sensor holder and the seal, and even during actual running, which is a harsh environment, the rain from the outside The or dust or foreign matter such as magnetic powder entering can be reliably prevented. Therefore, the reliability of detecting the rotational speed of the wheel can be significantly improved.

  In addition, the axial dimension of the encoder can be shortened as compared with the conventional rotational speed detecting device that detects the rotational speed by arranging it oppositely in the radial direction, and the large-diameter cylindrical portion of the second seal plate is made of the inner ring. Since it protrudes from the large end face, the rigidity of the second seal plate can be secured to maintain the sealing performance, and the width dimension of the inner ring can be suppressed to the minimum necessary. Therefore, the wheel bearing device can be reduced in weight and size, and the fuel efficiency and performance of the vehicle can be 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 inner member and the outer member A double row rolling element accommodated between the rolling surfaces, 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 The sensor holder is integrally molded with the sensor holder, and the encoder is In the wheel bearing device with a rotational speed detection device provided with a rotational speed sensor facing the driver via a predetermined axial clearance, the encoder has an annular shape, and the characteristics in the circumferential direction are alternately and equally spaced. The seal is disposed on the inboard side of the encoder via the sensor holder, and the seals are respectively attached to the sensor holder and the inner ring, and are arranged in a ring-like manner. 1 and a second sealing plate, and a fitting cylindrical portion in which the second sealing plate is externally fitted to the inner ring, a large diameter cylindrical portion formed to have a larger diameter than the fitting cylindrical portion, The large-diameter cylindrical portion has a standing plate portion extending radially outward from the large-diameter cylindrical portion, and the large-diameter cylindrical portion is disposed so as to protrude from the large end surface of the inner ring.

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, 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 includes an outer member 1, an inner member 5 comprising a hub wheel 3 and an inner ring 4 fitted on the hub wheel 3, and an inner member 5 thereof. It has double row rolling elements (balls) 7 and 7 accommodated between the side member 5 and the outer member 1.

  The outer member 1 integrally has a vehicle body mounting flange 1b for mounting on a knuckle N constituting a suspension device on the outer periphery, and double row outer rolling surfaces 1a, 1a are formed on the inner periphery. The hub wheel 3 integrally has a wheel mounting flange 2 for mounting a wheel (not shown) at one end, and the inner side on the outboard side facing the double-row outer rolling surfaces 1a, 1a of the outer member 1 on the outer periphery. A rolling surface 3a and a cylindrical small diameter step portion 3b extending in the axial direction from the inner rolling surface 3a are formed. An inner ring 4 in which an inner rolling surface 4a on the inboard side facing the double row outer rolling surfaces 1a, 1a of the outer member 1 is formed on the outer periphery is press-fitted into the small-diameter step portion 3b of the hub wheel 3. A crimped portion 3c is formed by plastically deforming the end of the small-diameter stepped portion 3b radially outward. The inner ring 4 is fixed to the hub wheel 3 in the axial direction by the crimped portion 3c, so-called self-retained. It has a structure. Between both rolling surfaces of the outer member 1 and the inner member 5, double-row rolling elements 7, 7 are accommodated through the cages 6, 6 so as to roll freely, which is referred to as a so-called third generation. It constitutes a wheel bearing device.

  The outer member 1 is made of medium carbon steel containing 0.40 to 0.80 wt% of carbon such as S53C, and at least the double row outer rolling surfaces 1a and 1a have a surface hardness of 58 to 64HRC by induction hardening. The hardened layer is formed in the range. Further, seals 8 and 9 are attached to the end portion of the outer member 1 to prevent leakage of lubricating grease sealed inside the bearing and intrusion of rainwater, dust and the like into the bearing from the outside.

  The hub wheel 3 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 where the seal 8 on the outboard side is in sliding contact to the inner rolling surface 3a and the small diameter step portion 3b. Thus, a hardened layer is formed with a surface hardness in the range of 58 to 64 HRC by induction hardening. The caulking portion 3c is an unquenched portion having a surface hardness of 25HRC or less after forging. As a result, the seal land as the base of the wheel mounting flange 2 not only has improved wear resistance, but also has sufficient mechanical strength against the rotational bending load applied to the wheel mounting flange 2. The durability of 3 is further improved. In addition, the workability when plastically deforming the caulking portion 3c 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) 3d is formed on the inner periphery of the hub wheel 3, and an outer joint member 10 constituting a constant velocity universal joint is fitted through the serration 3d. The shoulder portion 11 of the outer joint member 10 is abutted against the caulking portion 3 c of the hub wheel 3, and is integrally fixed to the hub wheel 3 in the axial direction by a fixing nut 12.

  In the present embodiment, as shown in an enlarged view in FIG. 2, the sensor holder 13 formed in an annular shape is attached to the end of the outer member 1. The sensor holder 13 includes a fitting ring 14 and a holding portion 15 coupled to the fitting ring 14. The fitting ring 14 includes a cylindrical fitting portion 14a that is press-fitted into the outer periphery of the outer member 1, a flange portion 14b that extends radially inward from the fitting portion 14a, and an axial direction from the flange portion 14b. It consists of a cylindrical part 14c that extends, and is entirely formed in an annular shape. The fitting ring 14 is formed by press working a stainless steel plate having corrosion resistance. In particular, the fitting ring 14 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 18 described later. Preferably it is done.

  Perforations 16 are formed at a plurality of locations in the circumferential direction of the cylindrical portion 14c, and the holding portion 15 is integrally molded with a synthetic resin. The sensor holder 13 is press-fitted and fixed to the end portion of the outer member 1 with the flange portion 14 b of the fitting ring 14 in close contact with the end surface of the outer member 1. In addition, although the holding part 15 illustrated here what was integrally molded by the fitting ring 14, although not limited to this, although not shown in figure, an opening is formed in the cylindrical part of a fitting ring, from this opening You may make it mount a holding | maintenance part to a fitting ring so that the one part may protrude radially inward.

  A rotation speed sensor 18 is embedded in the holding portion 15 so as to face an encoder 24 described later via a predetermined axial clearance (air gap). Thereby, the axial direction dimension of the encoder 24 can be shortened compared with the conventional rotational speed detection apparatus which detects the rotational speed by opposingly arranging in the radial direction. Thereby, the width dimension of the inner ring | wheel 4 which externally fits the encoder 24 can be suppressed. The rotational speed sensor 18 incorporates a magnetic detection element such as a Hall element or a magnetoresistive element (MR element) 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 detection element. IC.

  The inboard side seal 9 is composed of annular first and second seal plates 19 and 20 having a substantially L-shaped cross section. The cylindrical portion 14 c of the fitting ring 14 in the sensor holder 13 and the outer ring 4 are arranged outside. They are respectively fitted to the diameters and arranged to face each other. The first seal plate 19 includes a cylindrical portion 19a fitted in the sensor holder 13 and a standing plate portion 19b extending radially inward from one end of the cylindrical portion 19a. The first seal plate 19 is integrally provided with a side lip 21a, a grease lip 21b, and an intermediate lip 21c, and a seal member 21 made of an elastic member such as rubber is integrally vulcanized and bonded.

  On the other hand, the second seal plate 20 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). And a fitting cylindrical portion 20a fitted on the inner ring 4, a large-diameter cylindrical portion 20b formed with a larger diameter than the fitting cylindrical portion 20a, and extending radially outward from the large-diameter cylindrical portion 20b. And a standing plate portion 20c.

  The side lip 21a is in sliding contact with the standing plate portion 20b of the second seal plate 20, and the grease lip 21b and the intermediate lip 21c are in sliding contact with the large-diameter cylindrical portion 20b of the second seal plate 20, respectively. Further, the end of the upright plate portion 20 c of the second seal plate 20 faces the cylindrical portion 19 a of the first seal plate 19 through a slight radial clearance to constitute a labyrinth seal 22. Thereby, the sealing performance of the seal 9 on the inboard side can be further improved.

  Here, the large-diameter cylindrical portion 20 b of the second seal plate 20 is disposed so as to protrude from the large end surface 4 b of the inner ring 4 toward the inboard side. As a result, the width dimension of the inner ring 4 can be suppressed to the minimum necessary in combination with the shortening of the axial dimension of the encoder 24 described above, and the weight reduction and compactness of the wheel bearing device can be further promoted. It is possible to improve fuel consumption and performance.

  In the present embodiment, the cylindrical portion of the second seal plate 20 has a two-stage structure including a fitting cylindrical portion 20a that is fitted on the inner ring 4 and a large-diameter cylindrical portion 20b that has a larger diameter than the fitting cylindrical portion 20a. Therefore, even if the large-diameter cylindrical portion 20b is disposed so as to protrude from the large end surface 4b of the inner ring 4, the rigidity of the second seal plate 20 can be ensured and the sealing performance can be maintained. .

  Further, a ring-shaped elastic member 23 (shown by a broken line in the figure) made of an O-ring or the like is elastically mounted in an annular space between the large-diameter cylindrical portion 20b and the outer diameter of the inner ring 4, so that the fitting cylindrical portion 20a and the inner ring The sealability of the fitting part with 4 can be remarkably improved, and rainwater or the like can be reliably prevented from entering the inside of the bearing from the outside over a long period of time.

  An encoder 24 is disposed on the opposite side of the seal 9 across the holding portion 15 of the sensor holder 13, that is, on the outboard side. The encoder 24 includes a cylindrical portion 24a that is externally fitted to the inner ring 4, and a standing plate portion 24b that extends radially outward from the cylindrical portion 24a, and has a substantially L-shaped cross section. An encoder body 17 in which magnetic material 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 24b. The encoder main body 17 is alternately magnetized with magnetic poles N and S in the circumferential direction to constitute a rotary encoder for detecting wheel rotation speed.

  Thus, in this embodiment, since the rotational speed sensor 18 is arrange | positioned at the annular | circular shaped sensor holder 13, and the seal | sticker 9 is fitted in the inboard side of this rotational speed sensor 18, it is a finished product manufacturer of a motor vehicle. In the state before the outer joint member 10 is internally fitted to the hub wheel 3 including when it is transported to the assembly line, and in the actual running that is a harsh environment, the encoder body 17 and the rotational speed sensor 18 are detected. It is possible to reliably prevent foreign matters such as magnetic powder from entering between the two parts (see FIG. 1). Therefore, the reliability of detecting the rotational speed of the wheel can be significantly improved. In addition, the radial direction can be reduced, and the surroundings of the rotation speed sensor 18 and the like can be simplified, and the assembly workability is further improved.

  In this embodiment, the rotational speed detection device is an active type comprising an encoder body 17 having magnetic poles N and S alternately magnetized in the circumferential direction, and a rotational speed sensor 18 comprising a magnetic detection element such as a Hall element. However, the rotational speed detection device according to the present invention is not limited to this, and may be, for example, a passive type including a magnetic encoder, 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 is a wheel bearing in which any type of rotation speed detection device is incorporated in the inner ring rotation structure regardless of the configuration of the bearing portion, the driving wheel side, or the driven wheel side. It can be applied to the device.

It is a longitudinal section showing one embodiment of a wheel bearing device concerning the present invention. It is a principal part enlarged view same as the above. 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. Outer member 1a ... Outer rolling surface 1b ..... Body mounting flange 2 ..... Wheel mounting flange 3 ...・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ Hub wheel 3a, 4a ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ Inner rolling surface 3b ・ ・ ・ ・ ・ ・ ・ ・・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ Small diameter step part 3c ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ Clamping part 3d ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・... Serration 4 ... Inner ring 4b ... Large end face 5 ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ Inner member 6 ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ Retainer 7・... Rolling element 8 ... Outboard side seal 9 ...・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ Inboard side seal 10 ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ Outer joint member 11 ・ ・ ・ ・... shoulder 12 ... fixing nut 13 ... ·········· Sensor holder 14 ························· Fitting ring 14a ... Fitting part 14b ............. collar parts 14c, 19a, 24a ........... cylindrical part 15 ... ············ Holding part 16・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ Encoder body 18 ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ Rotational speed sensor 19 ・ ・ ・ ・ ・ ・··············· First seal plates 19b, 20c, 24b ... 2nd seal plate 20a ... fitting cylinder 20b ...・ ・ Large-diameter cylindrical part 21 ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ Seal member 21a ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ Side lip 21b ... grease lip 21c ... intermediate lip 22 ...・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ Labyrinth seal 23 ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・.... Elastic member 24 ..... Encoder 51 ... -Outer member 51a ... Outer rolling surface 51b ... Car body mounting flange 52・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ Inner member 53 ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ Ball 54 ・ ・ ・ ・ ・ ・..... Wheel mounting flange 54a ........... hub bolt 55 ...・ ・ ・ ・ ・ ・ Hub wheel 55a, 56a ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ Inner rolling surface 55b ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ Small diameter step Part 55c ... Serration 57 ...・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ Retainer 58, 59 ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ Seal 60・ ・ ・ Outer joint member 61 ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ Stem 62 ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ Rotational speed Detector 63 ... Encoder 64 ... Sensor 65 ...・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ Plastic magnet 66 ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ Base 67・ ・ ・ ・ Protective cover 68 ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ Main body 69 ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・・ Locking piece 69a ... Projection 70 ... ... cord wire 71 ... support ring 72 ...・ ・ ・ ・ ・ First cylindrical part 73 ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ First annular plate part 74 ・ ・ ・ ・ ・ ・ ・ ・ ・ ・2nd cylindrical part 75 ... 2nd annular plate 76 ... ... Third cylindrical part 77 ..... Sensor pocket 78 ..... Joint hole 79 ... 1st seal plate 80 ... 2nd Seal plate 80a ... Cylindrical part 80b ... Standing plate part 81 ............ Core metal 82 ...・ ・ ・ ・ ・ ・ ・ ・ Side lip 82b, 82c ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ Radial lip N ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・knuckle

Claims (5)

An outer member having a double row outer raceway formed on the inner periphery;
It has a wheel mounting flange for mounting a wheel at one end, and a hub wheel formed with a 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 this hub wheel, An inner member in which an inner rolling surface facing the outer rolling surface of the double row is formed on the outer periphery;
A double row rolling element accommodated in a freely rolling manner between the rolling surfaces of the inner member and the outer 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 that is integrally molded with the sensor holder and includes a rotational speed sensor that faces the encoder via a predetermined axial clearance,
The encoder has an annular shape, and is configured such that characteristics in the circumferential direction change alternately and at equal intervals. A seal is disposed on the inboard side of the encoder via the sensor holder. The sensor holder and the inner ring are respectively mounted and made of annular first and second sealing plates disposed opposite to each other,
A fitting cylindrical portion in which the second seal plate is fitted onto the inner ring, a large-diameter cylindrical portion having a one-step larger diameter from the fitting cylindrical portion, and radially outward from the large-diameter cylindrical portion. A wheel bearing device with a rotational speed detecting device, characterized in that the large-diameter cylindrical portion protrudes from the large end surface of the inner ring.   The sensor holder includes a steel plate 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 a flange extending inward in the radial direction from the fitting portion and in close contact with the end surface of the outer member, and a cylindrical portion extending in the axial direction from the flange, and the first cylindrical portion The wheel bearing device with a rotational speed detection device according to claim 1, wherein the seal plate is fitted inside.   The rotational speed detection device according to claim 2, wherein a plurality of perforations are formed in the cylindrical portion of the fitting ring, the holding portion is integrally molded, and the rotational speed sensor is embedded in the holding portion. Wheel bearing device.   The wheel bearing device with a rotational speed detection device according to claim 2 or 3, wherein the fitting ring is formed by press forming from a non-magnetic steel plate having corrosion resistance.   The wheel bearing device with a rotational speed detection device according to any one of claims 1 to 4, wherein a ring-shaped elastic member is elastically mounted in an annular space between the large-diameter cylindrical portion and the outer diameter of the inner ring.

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