JP2006308396A - Bearing device for wheel with rotating speed detecting device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a bearing device for wheels with rotating speed detecting device capable of maintaining fixation of a sensor holder over long term and enhancing reliability of the rotating speed detection of wheels. <P>SOLUTION: The sensor holder 16 includes a steel plate-made casing 17 consisting of a cylindrical fitting section 17a pressed into the edge periphery 5c of a lateral member 5, a brim section 17b extending to the internal radial direction from this, and a bottom section 17c extending along the axial direction from the brim section and a synthetic resin-made retaining section 18, combined with the bottoms section 17c a rotating speed sensor 19 is embedding, while a plurality of inclined locking parts 26 are formed by a process of cutting and raising to project to the equi-allocation positions of circumference of the fitting section 17a of casing 17 to the internal radial direction and to increase its diameter toward the fitting direction and on the other hand, an annular locking groove 27 is formed at the edge periphery 5c of a lateral member 5, the locking parts 26 is engaged with the locking groove 27, and the casing 17 is fixed along the axially direction to the lateral member 5. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

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

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

  In general, the rotational speed sensor is attached to the knuckle after the wheel bearing device is attached to the knuckle constituting the suspension device. However, in order to eliminate the complexity of 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. 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 61 serving as a fixing member, and the outer member 61 via double-row rolling elements (balls) 63 and 63. And an inner member 62 inserted therein. The outer member 61 integrally has a vehicle body mounting flange 61b on the outer periphery, and double row outer rolling surfaces 61a and 61a are formed on the inner periphery. On the other hand, the inner member 62 is formed with double-row inner rolling surfaces 65a and 66a facing the outer rolling surfaces 61a and 61a of the outer member 61 described above. Of these double row inner rolling surfaces 65 a and 66 a, one inner rolling surface 65 a is integrally formed on the outer periphery of the hub wheel 65, and the other inner rolling surface 66 a is formed on the outer periphery of the inner ring 66. The inner ring 66 is press-fitted into a cylindrical small-diameter step portion 65b extending in the axial direction from the inner rolling surface 65a of the hub wheel 65. And the double row rolling elements 63 and 63 are accommodated between these both rolling surfaces, respectively, and are hold | maintained by the holder | retainers 67 and 67 so that rolling is possible.

  The hub wheel 65 integrally has a wheel mounting flange 64 for mounting a wheel (not shown) on the outer periphery, and a hub bolt 64a for fixing the wheel is planted at a circumferentially equidistant position of the wheel mounting flange 64. It is installed. A serration 65c is formed on the inner periphery of the hub wheel 65, and a stem portion 71 of an outer joint member 70 constituting a constant velocity universal joint (not shown) is fitted therein. The inner member 62 refers to the hub ring 65 and the inner ring 66. Seals 68 and 69 are attached to the end portion of the outer member 61 to prevent leakage of lubricating grease sealed inside the bearing and intrusion of rainwater, dust, and the like from the outside into the bearing.

  As shown in an enlarged view in FIG. 6, the inboard-side seal 69 is fitted into the inner periphery of the end of the outer member 61 and has a first seal plate 72 formed in an L-shaped cross section, and the first seal plate 72. And a second seal plate 73 having an L-shaped cross section. The second seal plate 73 includes a cylindrical portion 73a fitted on the inner ring 66, and a standing plate portion 73b extending radially outward from the cylindrical portion 73a. On the outer surface of the standing plate portion 73b. The magnetic encoder 74 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 72 is a cored bar 75 having an L-shaped cross section and is integrally vulcanized and bonded to the cored bar 75, and the inner surface of the upright plate portion 73 b in the second seal plate 73. And a seal member 76 including a pair of radial lips 76b and 76c in sliding contact with the cylindrical portion 73a.

  An annular sensor holder 79 is attached to the end of the outer member 61. The sensor holder 79 includes a fitting cylinder 77 and a holding portion 78 coupled to the fitting cylinder 77. The fitting tube 77 includes a cylindrical fitting tube portion 77a and an inward flange portion 77b extending radially inward from the fitting tube portion 77a, and is formed in an annular shape as a whole.

  The holding portion 78 is embedded with a rotational speed sensor 80 that faces the magnetic encoder 74 via a predetermined air gap, and is integrally molded with a synthetic resin. The rotation speed sensor 80 incorporates a magnetic detecting element such as a Hall element, a magnetoresistive element (MR element) or the like that changes its characteristics according to the flow direction of magnetic flux, and a waveform shaping circuit that adjusts the output waveform of the magnetic detecting element. It consists of IC.

Here, the labyrinth seal is configured by causing the end face of the inner ring 66 and the inward flange portion 77b of the fitting cylinder 77 to closely face each other through the minute gap 81. Thus, the magnetic encoder 74 and the rotational speed sensor 80 can be connected to each other even before the stem portion 71 of the outer joint member 70 is fitted to the inner diameter of the hub wheel 65, including when it is transported to the assembly line of the finished vehicle manufacturer. It is possible to prevent foreign matter such as magnetic powder from entering the detection unit from the outside, and it is possible to improve the reliability of wheel rotation speed detection.
JP 2003-254985 A

  Such a conventional wheel bearing device with a rotational speed detection device is in a state before the stem portion 71 of the outer joint member 70 is fitted to the inner diameter of the hub wheel 65, including when it is transported to the assembly line of a finished vehicle manufacturer. However, although it has a feature that foreign matter such as magnetic powder can be prevented from entering between the magnetic encoder 74 and the detection portion of the rotation speed sensor 80, the fitting cylinder 77 is provided on the outer member 61. The sensor holder 79 may move in the axial direction only by being press-fitted and fixed to the end portion. That is, in this type of wheel bearing device, various vibrations are generated during traveling, and the outer member 61 is repeatedly deformed by a load applied thereto. And the air gap between the rotation speed sensor 80 and the detection unit may be broken. Thereby, not only the reliability of detecting the rotational speed of the wheel is lowered, but also the sensor holder 79 may fall off the outer member 61 during long-term use.

  SUMMARY OF THE INVENTION The present invention has been made in view of such circumstances, and the wheel bearing device with a rotational speed detection device that maintains the fixing of the sensor holder for a long period of time and improves the reliability of the rotational speed detection of the wheel. The purpose is to provide.

  In order to achieve such an object, the invention according to claim 1 of the present invention is an outer body in which a vehicle body mounting flange for mounting to a knuckle is integrally formed on the outer periphery, and a double row outer rolling surface is formed on the inner periphery. And a hub ring integrally having a wheel mounting flange for mounting a wheel at one end thereof and 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 An inner member having an inner rolling surface facing the outer rolling surface of the double row on the outer periphery, and freely rollable between the rolling surfaces of the inner member and the outer member. A double row rolling element housed in the outer member, a sensor holder attached to an end of the outer member and having a rotational speed sensor, and fitted on the inner ring, and a predetermined air gap is passed through the rotational speed sensor. Rotational speed detection with magnetic encoder arranged opposite to each other In the wheel bearing device with a device, the sensor holder includes a cylindrical fitting portion fitted to the outer periphery of the end portion of the outer member, a flange portion extending radially inward from the fitting portion, A cover made of a steel plate having a bottom portion extending in the axial direction from the flange portion, and a synthetic resin holding portion which is coupled to the bottom portion of the cover and in which the rotation speed sensor is embedded, and the fitting portion of the cover In addition, an inclined locking piece that protrudes radially inward and gradually increases in diameter in the fitting direction is formed, and an annular locking groove is formed on the outer periphery of the end of the outer member. A configuration is adopted in which the locking piece is engaged with the groove, and the cover is fixed in the axial direction with respect to the outer member.

  As described above, in the wheel bearing device with a rotation speed detection device of the inner ring rotation type, the sensor holder includes a cylindrical fitting portion press-fitted into the outer periphery of the end portion of the outer member, and a radially inner portion from the fitting portion. A steel plate cover having a flange extending in the direction and a bottom extending in the axial direction from the flange, and a synthetic resin holding unit that is coupled to the bottom of the cover and in which the rotation speed sensor is embedded. The cover is formed with an inclined locking piece that protrudes radially inward and gradually increases in diameter in the fitting direction, and an annular locking groove is formed on the outer periphery of the end of the outer member. Since the locking piece is engaged with the locking groove and the cover is fixed to the outer member in the axial direction, the fitting portion is fitted to the outer periphery of the end portion of the outer member. As a result, the locking piece is elastically deformed and restored radially inward at the position of the locking groove. Therefore, it is possible to attach the cover with one touch without providing a caulking process or the like, or without press-fitting into the outer periphery of the end as in the past, reducing the number of assembly steps and reducing the cost. Can do. Also, once this locking piece is engaged with the locking groove, it will be locked, and even if vibration occurs when the vehicle is running, a large load will be applied to the outer member, and the elliptical shape will be repeatedly deformed. However, the cover is firmly fixed to the outer member and does not move. Therefore, the air gap between the magnetic encoder and the detection unit of the rotational speed sensor can be maintained in an initially set state for a long period of time, and the reliability of detecting the rotational speed of the wheel is improved.

  Preferably, as in the invention described in claim 2, the outer member is formed with an inrow portion of the knuckle, and the outer periphery of the end portion is formed to have a smaller diameter than the inrow portion, and the outer diameter is a plate of the cover. If the step is set to correspond to the thickness, the engagement portion of the cover is restrained by the inner diameter of the knuckle after the assembly is completed, so that the engagement with the locking groove of the outer member is released. It is possible to prevent the cover from moving reliably.

  Further, as in the invention according to claim 3, if a plurality of the locking pieces are formed by cutting and raising at the circumferentially equidistant positions of the fitting portion, Even if the plate thickness is set to be thin, it is possible to ensure a desired resistance to pulling out.

  Further, the locking groove may be formed in a rectangular cross section as in the invention described in claim 4, and at least of the wall surfaces on both sides as in the invention described in claim 5. The wall surface on the inboard side may be formed as an inclined surface extending in the outer diameter direction.

  A wheel bearing device with a rotational speed detection device according to the present invention integrally has a vehicle body mounting flange for mounting to a knuckle on the outer periphery, and an outer member having a double row outer rolling surface 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, and the inner member and the outer member are accommodated in a freely rollable manner between the respective rolling surfaces. A double-row rolling element, a sensor holder attached to the end of the outer member and having a rotational speed sensor, and externally fitted to the inner ring, and disposed opposite to the rotational speed sensor via a predetermined air gap. Rotational speed detection device having a magnetic encoder In the rolling wheel bearing device, the sensor holder includes a cylindrical fitting portion fitted on the outer periphery of the end portion of the outer member, a flange portion extending radially inward from the fitting portion, A cover made of a steel plate comprising a bottom portion extending in the axial direction from the portion, and a synthetic resin holding portion that is coupled to the bottom portion of the cover and in which the rotation speed sensor is embedded, the fitting portion of the cover An inclined locking piece that protrudes radially inward and gradually increases in diameter in the fitting direction is formed, and an annular locking groove is formed on the outer periphery of the end of the outer member. Since the cover is fixed in the axial direction with respect to the outer member, the engagement piece is fitted to the outer periphery of the end of the outer member. It is elastically deformed and restored radially inward at the position of the locking groove. Therefore, it is possible to attach the cover with one touch without providing a caulking process or the like, or without press-fitting into the outer periphery of the end as in the past, reducing the number of assembly steps and reducing the cost. Can do. Also, once this locking piece is engaged with the locking groove, it will be locked, and even if vibration occurs when the vehicle is running, a large load will be applied to the outer member, and the elliptical shape will be repeatedly deformed. However, the cover is firmly fixed to the outer member and does not move. Therefore, the air gap between the magnetic encoder and the detection unit of the rotational speed sensor can be maintained in an initially set state for a long period of time, and the reliability of detecting the rotational speed of the wheel is improved.

  A body mounting flange for mounting to the knuckle on the outer periphery is integrated, an outer member with a double row outer rolling surface formed on the inner periphery, and a wheel mounting flange for mounting the wheel on one end are integrated. And a hub wheel having an inner rolling surface facing the outer rolling surface of the double row on the outer periphery, and a cylindrical small-diameter stepped portion extending in the axial direction from the inner rolling surface, and the hub wheel. An inner member comprising an inner ring that is press-fitted into a small-diameter step portion and has an outer ring formed with the other inner rolling surface facing the outer rolling surface of the double row on the outer periphery, and the inner member and the outer member. A double row rolling element housed in a freely rolling manner between the respective rolling surfaces, a sensor holder attached to an end of the outer member and having a rotational speed sensor, and an outer fit to the inner ring and the rotation Magnetic encoder placed opposite to the speed sensor through a predetermined air gap In the wheel bearing device with a rotational speed detecting device, the sensor holder includes a cylindrical fitting portion fitted on an outer periphery of an end portion of the outer member, and a radially inner portion from the fitting portion. A steel plate cover having a flange portion extending in the direction of the plate and a bottom portion extending in the axial direction from the flange portion, and a synthetic resin holding portion that is coupled to the bottom portion of the cover and in which the rotation speed sensor is embedded. A plurality of inclined locking pieces that protrude radially inwardly at circumferentially equidistant positions in the fitting portion of the cover and gradually increase in diameter in the fitting direction are formed by cutting and raising, and the outer side An annular locking groove is formed on the outer periphery of the end portion of the member. The locking piece is engaged with the locking groove, and the cover is fixed in the axial direction with respect to the outer member.

Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.
FIG. 1 is a longitudinal sectional view showing an embodiment of a wheel bearing device with a rotational speed detection device according to the present invention, FIG. 2 is an enlarged view of a main part of FIG. 1, and FIG. Sectional drawing which shows embodiment of a sensor holder, (b) is a front view. 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 detecting device is called a third generation for driving wheels, and includes an inner member 3 composed of a hub wheel 1 and an inner ring 2, and double row rolling elements (balls) on the inner member 3. ) 4 and 4, and an outer member 5 inserted through 4 and 4.

  The hub wheel 1 integrally has a wheel mounting flange 6 for mounting a wheel (not shown) at an end portion on the outboard side, and hub bolts 6 a are implanted at circumferentially equidistant positions of the wheel mounting flange 6. ing. Moreover, one (outboard side) inner side rolling surface 1a and the cylindrical small diameter step part 1b extended in an axial direction from this inner side rolling surface 1a are formed in the outer periphery. An inner ring 2 in which the other (inboard side) inner rolling surface 2a is formed on the outer periphery is press-fitted into the small-diameter step portion 1b through a predetermined shimiro.

  The outer member 5 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 5b for mounting to a knuckle N that constitutes a suspension device on the outer periphery. Double row outer raceway surfaces 5a and 5a are formed integrally around the circumference so as to face the double row inner raceway surfaces 1a and 2a. A hardened layer is formed on the outer rolling surfaces 5a and 5a by induction hardening in a surface hardness range of 58 to 64 HRC. And between the outer side rolling surfaces 5a and 5a of this outer member 5, and the double row inner side rolling surfaces 1a and 2a which oppose these, the double row rolling elements 4 and 4 are each accommodated, and the holder | retainer 7 is stored. , 7 are held in a rollable manner. Further, seals 8 and 9 are attached to the end portion of the outer member 5 to prevent leakage of lubricating grease sealed inside the bearing and intrusion of rainwater, dust, etc. 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 where the outboard side seal 8 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. As a result, the seal land as the base of the wheel mounting flange 6 not only has improved wear resistance, but also has sufficient mechanical strength against the rotational bending load applied to the wheel mounting flange 6. The durability of 1 is further improved. On the other hand, the inner ring 2 is made of high carbon chrome bearing steel such as SUJ2, and is hardened in the range of 58 to 64 HRC up to the core portion by quenching.

  A serration (or spline) 1c is formed on the inner periphery of the hub wheel 1, and an outer joint member 11 constituting the constant velocity universal joint 10 is fitted therein. The outer joint member 11 is integrally provided with a cup-shaped mouth portion 12, a shoulder portion 13 that forms the bottom portion of the mouth portion 12, and a stem portion 14 that extends from the shoulder portion 13 in the axial direction. A serration (or spline) 14 a is formed on the outer periphery of the stem portion 14 and is engaged with the serration 1 c of the hub wheel 1. The outer joint member 11 has a shoulder 13 abutted against the inner ring 2, and the hub wheel 1 and the outer joint member 12 are detachably integrated with each other in the axial direction by a fixing nut 15. The base portion of the stem portion 14 is fitted into the small diameter step portion 1b of the hub wheel 1 through a predetermined radial clearance. As a result, the end portion of the hub wheel 1 is cylindrically supported by the stem portion 14, so that the rigidity of the hub wheel 1 is increased and the durability is further improved. In addition, although the double row angular contact ball bearing which used the rolling elements 4 and 4 as a ball | bowl was illustrated here, it is not restricted to this, The double row tapered roller bearing which uses a tapered roller for a rolling element may be sufficient. Further, in the present embodiment, the structure called the third generation is illustrated, but the present invention is not limited to this, and for example, a second generation structure may be used.

  In the present embodiment, the sensor holder 16 is attached to the end of the outer member 5. As shown in an enlarged view in FIG. 2, the sensor holder 16 includes a cover 17 having a substantially cup-shaped cross section, and a holding portion 18 coupled to the cover 17. The cover 17 has a cylindrical fitting portion 17a fitted to the outer periphery 5c of the end portion of the outer member 5, a flange portion 17b extending radially inward from the fitting portion 17a, and an axial direction from the flange portion 17b. And a bottom portion 17c extending in a circle, and is formed in an annular shape as a whole. The sensor holder 16 is attached to the outer member 5 when the fitting portion 17a is fitted on the outer periphery 5c of the end portion of the outer member 5 with the flange portion 17b of the cover 17 being in close contact with the end surface of the outer member 5. Since it is fixed, the sensor holder 16 can be positioned and fixed with respect to the outer member 5 easily and accurately, and the rotational speed of the wheel can be detected with high accuracy. A circular hole 17d is formed in the bottom portion 17c and faces the shoulder portion 13 of the outer joint member 11 through a slight radial clearance to constitute a labyrinth seal 25.

  The cover 17 is formed by pressing a stainless steel plate or a corrosion-resistant steel plate (such as a JIS standard SPCC system) that has been subjected to rust prevention treatment. In particular, the cover 17 is formed of a non-magnetic steel plate, such as an austenitic stainless steel plate (JIS standard SUS304, etc.) so as not to adversely affect the sensing performance of the rotational speed sensor 19 described later. Is preferred.

  The holding part 18 is formed of synthetic resin by injection molding, the rotational speed sensor 19 is embedded, and the harness 18a is integrally connected. Then, the cover 17 is elastically mounted with one touch from a notch (not shown) formed at one location radially outward of the bottom 17c. The holding portion 18 may be integrally coupled to the cover 17 by injection molding, or may be formed in an annular shape so as to be fitted to the bottom portion 17 c of the cover 17. The rotational speed sensor 19 incorporates a magnetic detection element such as a Hall element, a magnetoresistive element (MR element), etc., whose characteristics change 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.

  On the other hand, a slinger 20 is press-fitted into the outer diameter of the inner ring 2 and faces the holding portion 18 in the axial direction. The slinger 20 forms a seal 9 on the inboard side, and includes a cylindrical portion 20a that is press-fitted into the inner ring 2, and a standing plate portion 20b that extends radially outward from the cylindrical portion 20a. The slinger 20 is made of a ferromagnetic steel plate, for example, a ferritic stainless steel plate (JIS standard SUS430 or the like) or a rust-proof cold rolled steel plate (JIS standard SPCC or the like). Are formed into a substantially L-shaped cross section by pressing. A magnetic encoder 21 in which a magnetic substance powder such as ferrite is mixed with an elastomer such as rubber is integrally vulcanized and bonded to a side surface of the standing board portion 20b of the slinger 20 on the inboard side. The magnetic encoder 21 is magnetized with magnetic poles N and S alternately in the circumferential direction to constitute a rotary encoder for detecting the rotational speed of the wheel. In this example, the magnetic encoder 21 is made of an elastomer. However, the invention is not limited to this. For example, the magnetic encoder 21 may be made of sintered metal obtained by hardening a ferromagnetic powder made of ferrite or the like with a metal binder.

  The inboard-side seal 9 includes the slinger 20 and an annular seal plate 22 mounted on the outer member 5 so as to face the slinger 20 and having a substantially L-shaped cross section. The seal plate 22 includes a cored bar 23 composed of a cylindrical part 23a fitted into the end of the outer member 5, and a standing plate part 23b extending radially inward from one end of the cylindrical part 23a. The seal member 24 is vulcanized and bonded to the gold 23. The core metal 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).

  The sealing member 24 is made of an elastic member such as rubber, and includes a side lip 24a that is in sliding contact with the standing plate portion 20b of the slinger 20, and a grease lip 24b and an intermediate lip 24c that are in sliding contact with the cylindrical portion 20a. Further, the outer edge of the standing plate portion 20 b of the slinger 20 faces the cylindrical portion 23 a of the core metal 23 through a slight radial clearance to form a labyrinth seal 25.

  In this embodiment, the seal 9 on the inboard side and the sensor holder 16 are arranged to face each other in the axial direction, and the magnetic encoder 21 is integrally joined to the slinger 20 constituting the seal 9, and the holding portion constituting the sensor holder 16. A rotational speed sensor 19 is embedded in 18, and this rotational speed sensor 19 is disposed opposite to the magnetic encoder 21 via an axial gap (air gap). The output of the rotational speed sensor 19 is taken out by the harness 18a and sent to an ABS controller (not shown). Here, as an example of the rotational speed detection apparatus, an active type rotational speed detection apparatus including the magnetic encoder 21 and the rotational speed sensor 19 including a magnetic detection element such as a Hall element is illustrated, but the rotational speed detection according to the present invention is illustrated. 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.

  Here, as shown in FIG. 3, the fitting portion 17a of the cover 17 protrudes inward in the radial direction by cutting and raising, and is a so-called fishhook-shaped locking piece that is gradually increased in diameter in the fitting direction. A plurality of 26 are formed. A plurality of these locking pieces 26 are formed at equidistant positions on the circumference of the fitting portion 17a and engage with a locking groove 27 of the outer member 5 described later to prevent the cover 17 from coming off in the axial direction. . Thereby, even if the plate | board thickness of the cover 17 is set thinly in order to improve workability, desired pulling-out proof strength is securable.

  On the other hand, the outer periphery of the outer member 5 is composed of an end outer periphery 5c to which the cover 17 is fitted, and an inrow portion 5d serving as a support surface for the knuckle N. The end outer periphery 5c is formed to have a smaller diameter than the inrow portion 5d. Has been. An annular locking groove 27 having a rectangular cross section is formed on the outer periphery 5c. Note that the end portion outer periphery 5 c and the inrow portion 5 d are set to a level difference corresponding to the plate thickness of the cover 17.

  As described above, since the locking piece 26 formed on the fitting portion 17a is inclined so as to gradually increase in diameter in the fitting direction, the fitting portion 17a is placed on the outer periphery 5c of the end portion of the outer member 5. By being fitted, it is elastically deformed and restored radially inward at the position of the locking groove 27. Therefore, the cover 17 can be attached with one touch without providing a caulking process or the like, or without pressing strongly into the outer periphery of the end as in the prior art, reducing the number of assembling steps and reducing the cost. be able to. Further, once the locking piece 26 is engaged with the locking groove 27, the locked state is obtained. Further, after the assembly is completed, the fitting portion 17a of the cover 17 is restrained by the inner diameter of the knuckle N. Even if vibration is occasionally generated, or even when a large load is applied to the outer member 5 and the elliptical shape is repeatedly deformed, the cover 17 is firmly fixed to the outer member 5 and does not move. Therefore, the air gap between the magnetic encoder 21 and the detection unit of the rotation speed sensor 19 can be maintained in an initially set state over a long period of time, and the reliability of wheel rotation speed detection is improved.

  Here, as the locking groove 27 of the outer member 5, an example in which the cross section is formed in a rectangular shape is illustrated. However, the shape is not limited to this shape, and the locking groove workability, the detachability of the cover 17, and the mounting property The locking grooves shown in FIGS. 4A to 4C in consideration of the above and the like can be exemplified. In addition, the same code | symbol is attached | subjected to the component and site | part same as embodiment mentioned above, and the duplicate description is avoided.

  The locking groove 28 shown in FIG. 4A is formed in an inclined surface 28a in which the wall surface on the inboard side (right side in the figure) of both wall surfaces extends in the outer diameter direction. Further, the locking groove 29 shown in (b) is formed in an inclined surface 29 a in which the wall surface on the outboard side (the left side in the drawing) of both side wall surfaces extends in the outer diameter direction of the locking piece 26. Furthermore, the locking groove 30 shown in (c) has wall surfaces on both sides formed on inclined surfaces 28a and 29a, respectively.

  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 a rotation speed detection device is built in the inner ring rotation structure regardless of the driven wheel side or the drive wheel side.

It is a longitudinal cross-sectional view which shows one Embodiment of the wheel bearing apparatus with a rotational speed detection apparatus which concerns on this invention. It is a principal part enlarged view same as the above. (A) is sectional drawing which shows embodiment of the sensor holder based on this invention. (B) is a front view same as the above. (A) thru | or (c) are the principal part enlarged views which show the modification of the latching groove | channel which concerns on this invention. It is a longitudinal cross-sectional view which shows the conventional wheel bearing apparatus with a rotational speed detection apparatus. It is a principal part enlarged view same as the above.

Explanation of symbols

1 .... hub wheel 1a, 2a ... inner raceway surface 1b ... small diameter step 1c, 14a ... ...... Serration 2 ... Inner ring 3 ... Inner member 4 ... Roll Moving body 5 ... Outer member 5a ... Outer rolling surface 5b ... Car body mounting flange 5c .......... end periphery 5d ........... spigot portion 6 ............ wheel mounting flange 6a · · · · · ·・ ・ ・ ・ ・ Hub bolt 7 ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ Retainer 8 ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ Outboard side seal 9 ・ ・ ・ ・ ・ ・ ・ ・ ・ ・・ ・ Inboard side seal 10 ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ Constant velocity universal joint 11 ・············· Outer joint member 12 ·········· Mouse portion 13 ······ shoulder portion 14 ······ .. Stem portion 15 ... Fixing nut 16 ... Sensor holder 17 ... Cover 17a ... ··························································································・ ・ ・ ・ ・ ・ ・ ・ ・ Holding part 18a ・ ・ ・ ・ ・ ・ ・ ・ Harness 19 ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ Rotational speed sensor 20 ・ ・ ・ ・ ・ ・Slinger 20a, 23a ... Cylindrical part 20b, 23b ... Standing plate part 21 ... Magnetic encoder 22 ... Seal plate 23 ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ Core 4 .... Sealing member 24a ... Side lip 24b ... Grease lip 24c ...・ Intermediate lip 25 ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ Labyrinth seal 26 ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ Locking pieces 27, 28, 29, 30 ・ ・ Locking grooves 28a, 29a ... ... Inclined surface 61 ... Outer member 61a ... Outer rolling surface 61b ... Car body mounting flange 62・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ Inner member 63 ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ Rolling element 64 ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ Wheel mounting flange 64a ・ ・ ・ ・ ・ ・········ Hub bolt 65 ···················· Hub rings 65a, 66a ····· Inner rolling surface 65b ······· Small diameter step portion 65c ... .. Serration 66 ... Inner ring 67 ... Retainer 68, 69 ... Seal 70 ... .... Outer joint member 71 ... Stem part 72 ... First seal plate 73 ... Second seal plate 73a ... Cylindrical part 73b ... Standing plate part 74 ... Magnetic encoder 75 ... ········ Core 76 ········· Sealing member 76a ··· Side lips 76b and 76c ··· Radial lip 77 ··· ········································································. .... Holding part 79 Sensor holder 80 ........... rotational speed sensor 81 ........... minute gap N ············ knuckle

Claims (5)

An outer member integrally having a vehicle body mounting flange for attaching to a knuckle on the outer periphery, and a double row outer rolling surface 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 housed movably between the rolling surfaces of the inner member and the outer member;
A sensor holder attached to an end of the outer member and having a rotational speed sensor;
In a wheel bearing device with a rotational speed detection device, comprising: a magnetic encoder that is externally fitted to the inner ring and disposed opposite to the rotational speed sensor via a predetermined air gap;
The sensor holder includes a cylindrical fitting portion fitted to the outer periphery of the end portion of the outer member, a flange portion extending radially inward from the fitting portion, and a bottom portion extending in the axial direction from the flange portion. A cover made of a steel plate and a synthetic resin holding part that is coupled to the bottom of the cover and in which the rotational speed sensor is embedded, and protrudes radially inward from the fitting part of the cover. An inclined locking piece that gradually increases in diameter in the fitting direction is formed, and an annular locking groove is formed on the outer periphery of the end of the outer member, and the locking piece is engaged with the locking groove. A wheel bearing device with a rotational speed detector, wherein the cover is fixed in the axial direction with respect to the outer member.   The outer member is formed with an inrow portion of the knuckle, an outer periphery of the end portion is formed with a smaller diameter than the inrow portion, and the outer diameter is set to be a step corresponding to the plate thickness of the cover. Item 2. A wheel bearing device with a rotational speed detection device according to Item 1.   The wheel bearing device with a rotational speed detecting device according to claim 1 or 2, wherein a plurality of the locking pieces are formed by cutting and raising at circumferentially equidistant positions of the fitting portion.   The wheel bearing device with a rotation speed detection device according to any one of claims 1 to 3, wherein the locking groove is formed in a rectangular cross section.   The wheel bearing device with a rotational speed detection device according to any one of claims 1 to 3, wherein the locking groove is formed on an inclined surface in which at least a wall surface on the inboard side of the both wall surfaces extends in the outer diameter direction.

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