JP4609928B2 - 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 adjusting the air gap between the rotational speed sensor and the magnetic encoder and to achieve a more compact design, recently, a bearing for a wheel with a rotational speed detection device that also incorporates the rotational speed sensor in the bearing. A device has been proposed.

  A structure as shown in FIG. 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 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. And an inner member 52 inserted therein. The inner member 52 includes a hub ring 55 and an inner ring 56 that is externally fitted to the hub ring 55.

  The outer member 51 has a vehicle body mounting flange 51b integrally 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. 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, and a stem portion 61 of an outer joint member 60 constituting a constant velocity universal joint (not shown) is internally fitted so as to transmit torque. Further, seals 58 and 59 are attached to the end portion of the outer member 51 to prevent leakage of lubricating grease sealed inside the bearing and intrusion of rainwater, dust or the like into the bearing from the outside.

  Here, a tone wheel 62 is externally fixed to the inner ring 56. The tone wheel 62 is formed in a comb-like shape in which a magnetic metal plate such as a steel plate is pressed to form an entire ring shape with an L-shaped cross section, and a large number of notches are arranged at equal intervals around the circumference. Is formed.

  On the other hand, a cover 63 is fitted and fixed to an end portion of the outer member 51 on the inboard side. The cover 63 is formed in an annular shape with a substantially L-shaped cross section by drawing a metal plate such as a stainless steel plate. The cover 63 includes a bottom plate portion 64 and a peripheral wall portion 65, and the peripheral wall portion 65 includes a large-diameter portion 65a on the opening side and a small-diameter portion 65b on the back side.

  A portion surrounded by the small diameter portion 65b and the bottom plate portion 64 is formed in an annular shape as a whole, and a holding portion 66 made of synthetic resin is fixed. A rotation speed sensor (not shown) is embedded in the holding portion 66, and is disposed to face the tone wheel 62 via an axial gap. The output of the rotation speed sensor is taken out by the harness 67 and sent to an ABS controller (not shown).

Further, a seal ring 68 made of an elastic member is joined to the inner peripheral edge portion of the bottom plate portion 64 constituting the cover 63. The leading edge of the seal ring 68 is in sliding contact with the outer peripheral surface of the outer joint member 60. Accordingly, foreign matter such as rainwater can be prevented from entering the rotational speed sensor, and the assembly work at the automobile manufacturer of such a wheel bearing device with a rotational speed detection device is performed by attaching the hub wheel 55 to the outer joint member 60. It is only necessary to couple to the stem portion 61 of the. Further, since the tone wheel 62 is covered with the cover 63, the tone wheel 62 does not collide with other parts at the time of conveyance, and is not damaged or shifted in position.
Japanese Patent Laid-Open No. 9-21823

  However, such a conventional wheel bearing device with a rotational speed detecting device has a troublesome problem. That is, in the assembly line of an automobile manufacturer, there is a possibility that the harness 67 for extracting the output of the rotation speed sensor may hang down and interfere with the outer joint member 60. Therefore, not only a clip (not shown) for stopping the harness 67 is required for each bent portion of the harness 67, but the harness 67 itself must be bent excessively depending on the attachment location. Such a fixing operation of the harness 67 is complicated and requires skill, resulting in a decrease in assembly workability and an increase in cost. Furthermore, there is a concern about the adverse effect on the internal wiring of the harness 67 by bending the harness 67, and improvement in reliability is desired.

  The present invention has been made in view of such circumstances, and improves the assembly workability and prevents the intrusion of foreign matter into the detection unit, thereby improving the reliability of the wheel bearing with a rotation speed detection device. The object is to provide a 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. 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, a double row rolling element housed in a freely rolling manner between the inner member and the outer member, and a constant velocity An outer joint member integrally forming a universal joint, a shoulder portion that abuts against an end surface of the inner ring, and a stem portion that extends in an axial direction from the shoulder portion and is fitted into the hub ring via a serration; The hub wheel and the outer joint member are detachably coupled, and the outer member An annular sensor holder attached to the end, a rotational speed sensor attached to the sensor holder, and an encoder fitted on the inner ring and opposed to the rotational speed sensor via a predetermined air gap In the wheel bearing device with a rotational speed detecting device, the sensor holder is fitted into an end portion of the outer member, is formed in a cup shape, and is a cylindrical fitting that is press-fitted into the outer periphery of the outer member. And a flange that extends radially inward from the fitting portion and is in close contact with the end face of the outer member, and a circle that extends in the axial direction from the flange and into which the shoulder portion of the outer joint member is inserted. It consists of a steel plate cover composed of a bottom portion having a hole, and a synthetic resin holding portion joined to one place in the circumferential direction of the bottom portion of the cover, and a rotation speed sensor is embedded in the holding portion, The outlet made of synthetic resin is the front Are integrally coupled by injection molding on the holding portion of the sensor holder is arranged on the inner diameter side than the fitting portion of the cover, the harness take out the output of said rotational speed sensor, via the outlet provided in the holding portion Thus, a configuration is adopted in which the rotation speed sensor is connected, the take-out port is inclined along the outer peripheral surface of the outer joint member, and is set larger than the inclination angle of the outer peripheral surface .

Thus, in the wheel bearing device with a rotation speed detection device of the inner ring rotation type, the sensor holder is fitted to the end of the outer member, is formed in a cup shape, and is a cylinder that is press-fitted into the outer periphery of the outer member. Fitting portion, a flange portion extending radially inward from the fitting portion and in close contact with the end surface of the outer member, and extending from the flange portion in the axial direction, and the shoulder portion of the outer joint member is inserted. A steel plate cover having a bottom portion having a circular hole and a synthetic resin holding portion coupled to one circumferential direction of the bottom portion of the cover, and the rotation speed sensor is embedded in the holding portion. In addition, a take-out port made of a synthetic resin is integrally coupled to the holding portion of the sensor holder by injection molding, and is disposed on the inner diameter side of the fitting portion of the cover. Rotation speed through the outlet provided in Is connected to the capacitors, the outlet is provided obliquely along the outer peripheral surface of the outer joint member, and, because it is set larger than the inclination angle of the outer peripheral surface, interfere with the outer joint member hanging harness It is possible to prevent this, and it is possible to simplify the fixing work of the harness with a simple configuration, to improve the workability of the assembly, and to reduce the cost. Further, it is not necessary to bend the harness itself excessively, and it is possible to prevent the adverse effect on the internal wiring and further improve the reliability.

It is preferable as defined in claim 2, wherein the encoder, the magnetic poles alternately magnetic powder is mixed circumferentially elastomeric N, since S consists magnetized magnetic encoder, the rotation of the vehicle wheel The speed can be detected with high accuracy.

According to a third aspect of the present invention, the inner edge of the cover, that is, the inner edge of the circular hole formed in the bottom part faces the shoulder part of the outer joint member through a slight radial clearance, and a labyrinth seal is provided. Since it is configured, foreign matter such as magnetic powder can be prevented from entering between the encoder and the detection unit of the rotation speed sensor even during actual running, which is a harsh environment. Therefore, the reliability of the wheel rotation speed detection device can be further improved.

According to a fourth aspect of the present invention, when the stem portion of the outer joint member is fitted to the inner periphery of the hub wheel via a predetermined radial clearance, the hub wheel is cylindrically supported by the stem portion. This can increase the rigidity of the hub wheel.

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 formed with an inner rolling surface, a double-row rolling element housed in a freely rolling manner between the inner member and the outer member, and a constant velocity universal joint And an outer joint member integrally including a shoulder portion that abuts against an end surface of the inner ring, and a stem portion that extends in an axial direction from the shoulder portion and is fitted into the hub wheel via serrations, The hub wheel and the outer joint member are detachably coupled, and the end of the outer member Rotational speed having an annular sensor holder mounted, a rotational speed sensor mounted on the sensor holder, and an encoder fitted on the inner ring and opposed to the rotational speed sensor via a predetermined air gap In the wheel bearing device with a detection device, the sensor holder is fitted to an end portion of the outer member, is formed in a cup shape, and is a cylindrical fitting portion that is press-fitted to the outer periphery of the outer member; A flange that extends radially inward from the fitting portion and is in close contact with the end surface of the outer member, and a circular hole that extends axially from the flange and into which the shoulder portion of the outer joint member is inserted. and steel plate cover comprising a bottom composed of a bottom portion of the steel combined synthetic resin circumferentially one place holder for the cover, the rotation speed sensor is embedded in the holding portion, a synthetic resin The outlet is Are integrally coupled by injection molding on the holding portion of the holder, are disposed on the inner diameter side than the fitting portion of the cover, the harness take out the output of said rotational speed sensor, via the outlet provided in the holding portion Wired to the rotational speed sensor, and the outlet is provided to be inclined along the outer peripheral surface of the outer joint member, and is set to be larger than the inclination angle of the outer peripheral surface. Interference with the joint member can be prevented, the fixing work of the harness can be simplified with a simple configuration, the workability of the assembly can be improved, and the cost can be reduced. Further, it is not necessary to bend the harness itself excessively, and it is possible to prevent the adverse effect on the internal wiring and further improve the reliability.

A body mounting flange is integrally formed on the outer periphery, 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 formed with one inner rolling surface facing the outer rolling surface of the double row, a cylindrical small diameter step portion extending in an axial direction from the inner rolling surface, and a small diameter step portion of the hub ring An inner member comprising an inner ring that is press-fitted and has an inner ring formed on the outer periphery with the other inner rolling surface facing the double row outer rolling surface, and the respective rolling surfaces of the inner member and the outer member A double row rolling element accommodated in a freely rolling manner, a constant velocity universal joint, a shoulder portion that abuts against the end face of the inner ring, an axial direction extending from the shoulder portion, and a serration on the hub ring And an outer joint member integrally having a stem portion fitted through the hub wheel, and an outer side of the hub wheel. A hand member is detachably coupled, and an annular sensor holder attached to an end of the outer member, a rotation speed sensor attached to the sensor holder, and an outer fit to the inner ring, In a wheel bearing device with a rotation speed detection device having an encoder opposed to a rotation speed sensor through a predetermined air gap, the sensor holder is fitted to an end of the outer member and formed in a cup shape A cylindrical fitting portion that is press-fitted into the outer periphery of the outer member, a flange portion that extends radially inward from the fitting portion and that is in close contact with the end surface of the outer member, and the flange portion. A steel plate cover that extends in the axial direction and includes a bottom portion having a circular hole into which the shoulder portion of the outer joint member is fitted, and a synthetic resin holding portion that is coupled to one circumferential direction of the bottom portion of the cover; The rotation speed sensor Together but are embedded, outlet made of synthetic resin, injection molding are integrally coupled by the holding portion of the sensor holder is arranged on the inner diameter side than the fitting portion of the cover, the output of the rotational speed sensor Is connected to the rotational speed sensor via an outlet provided in the holding portion, and an inclination angle along the outer peripheral surface of the outer joint member is provided at the outlet, and the inclination angle is It is set larger than the inclination angle of the outer peripheral surface.

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

  The hub wheel 1 integrally has a wheel mounting flange 6 for 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. Further, on the outer periphery, an inner rolling surface 1a on the outboard side and a cylindrical small diameter step portion 1b extending in the axial direction from the inner rolling surface 1a are formed. An inner ring 2 having an inboard-side inner rolling surface 2a formed on the outer periphery thereof is press-fitted into the small-diameter step portion 1b via 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 (not shown) on the outer periphery. The double row outer rolling surfaces 5a, 5a facing the double row inner rolling surfaces 1a, 2a are integrally formed. 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. Double row rolling elements 4, 4 are accommodated between outer rolling surfaces 5a, 5a of the outer member 5 and double row inner rolling surfaces 1a, 2a facing the outer rolling surfaces 5a, 5a, respectively. It is held so that it can roll freely. 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.

  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 includes 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 portion 13 abutted against the inner ring 2, and the hub wheel 1 and the outer joint member 12 are detachably coupled to 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 the present embodiment, as shown in an enlarged view in FIG. 2, the sensor holder 16 formed in an annular shape is attached to the end of the outer member 5. The sensor holder 16 includes a cover 17 formed in a substantially cup shape, and a holding portion 18 coupled to the cover 17. The cover 17 has a cylindrical fitting portion 17a that is press-fitted into the outer periphery of the outer member 5, a flange portion 17b that extends radially inward from the fitting portion 17a, and an axial direction that extends from the flange portion 17b. The joint member 11 includes a bottom portion 17c having a circular hole 17d into which the shoulder portion 13 is inserted, and is formed in an annular shape as a whole. This cover 17 is formed by pressing a stainless steel plate having corrosion resistance. 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.

  A holding portion 18 in which a rotational speed sensor 19 is embedded is coupled to one portion of the cover 17 on the outer side in the radial direction of the bottom portion 17c. The holding portion 18 is made of synthetic resin, and is elastically attached to a notch portion (not shown) formed in the bottom portion 17c with one touch. In addition, the holding | maintenance part 18 may be formed in the annular | circular shape, and may be integrally couple | bonded with the cover 17 by injection molding.

  The rotational speed sensor 19 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. Further, since the fitting portion 17 a is fitted on the end portion of the outer member 5 with the flange portion 17 b of the cover 17 being in close contact with the end surface of the outer member 5, the sensor holder 16 is attached to the outer member 5. Therefore, the positioning and fixing can be easily and accurately performed, and the rotational speed of the wheel can be detected with high accuracy.

  On the other hand, a slinger 20 is press-fitted into the outer diameter of the inner ring 2 so as to face the holding portion 18 in the axial direction. The slinger 20 constitutes an inboard-side seal 9, 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 in an elastomer such as rubber is integrally vulcanized and bonded to a side surface on the inboard side of the standing plate portion 20 b in the slinger 20. 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.

  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 metal core 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 26 and sent to an ABS controller (not shown).

  Here, the harness 26 is connected to the rotation speed sensor 19 via the take-out port 27. The take-out port 27 is made of synthetic resin and is integrally coupled to the holding portion 18 of the sensor holder 16 by injection molding or the like. Further, the take-out port 27 is formed with a predetermined inclination angle α radially outward along the outer periphery of the mouth portion 12 in the outer joint member 11. The inclination angle α is preferably larger than the inclination angle β of the mouse portion 12 (α ≧ β). Thereby, it can prevent that the harness 26 hangs down and interferes with the outer joint member 11. Therefore, the clip for stopping the sag of the harness 26 can be minimized, and the harness 26 itself does not need to be bent excessively, and adverse effects on the internal wiring can be prevented and the reliability can be further improved. In this embodiment, the fixing operation of the harness 26 can be simplified with such a simple configuration, and the assembling workability can be improved and the cost can be reduced.

  Furthermore, in the present embodiment, the inner end of the cover 17 constituting the sensor holder 16, that is, the inner edge of the circular hole 17d in the bottom portion 17c, passes through the outer peripheral surface of the shoulder portion 13 in the outer joint member 11 and a slight radial clearance. In opposition, a labyrinth seal 28 is formed. Thereby, it is possible to prevent foreign matter such as magnetic powder from entering between the magnetic encoder 21 and the detection unit of the rotational speed sensor 19 even during actual running, which is a severe environment. Therefore, the reliability of the wheel rotation speed detection device can be further improved. Although not shown, a sealing member made of an elastic member may be vulcanized and bonded to the inner edge of the circular hole 17d so as to be in sliding contact with the outer peripheral surface of the shoulder portion 13.

  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.

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

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

It is a longitudinal section showing 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.

Explanation of symbols

1 ... hub wheel 1a, 2a ... inner rolling surface 1b ... ··············· Small diameter step 1c, 14a ... Serration 2 ... ..... Inner ring 3 ..... Inner member 4 ... ... rolling element 5 ... outer member 5a ...・ Outer rolling surface 5b ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ Car body mounting flange 6 ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ Wheel Mounting flange 6a ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ Hub bolt 7 ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ Retainer・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ Outboard side seal 9 ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ Inboard side Seal 10 ... Constant velocity universal joint 11 ... Outer joint member 12・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ Mouse part 13 ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ Shoulder part 14 ・ ・ ・ ・ ・ ・・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ Stem 15 ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ Fixing nut 16 ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・..... Sensor holder 17 ..... Cover 17a ..... Part 17b ...・ Bottom part 17d ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ Circular hole 18 ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ Holding part 19 ・ ・ ・ ・・ ・ ・ ・ ・ ・ ・ ・ ・ ・ Rotational speed sensor 20 ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ Slinger 20a, 23a ・ ・ ・ ・ ・ ・ ・ ・····························································································· Magnetic encoder 22 ······························································· 24・ ・ ・ ・ ・ ・ ・ ・ ・ Seal member 24a ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ Side lip 24b・ ・ ・ ・ ・ ・ Grease lip 24c ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ Intermediate lip 25, 28 ... Labyrinth seal 26 ... Harness 27 ... ... Extraction port 51 ... Outer member 51a ...・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ Outer rolling surface 51b ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ Car body mounting flange 52 ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・... Inward member 53 ... Rolling element 54 ... Wheel mounting Flange 54a ... hub bolt 55 ... hub wheels 55a, 56a ...・ ・ ・ ・ ・ ・ ・ ・ ・ ・ Inner rolling surface 55b ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・・ Small diameter step 55c ・ ・ ・ ・ ・ ・ ・ ・ Serration 56 ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ Inner ring 57 ・ ・ ・ ・・ ・ ・ ・ ・ ・ ・ ・ ・ ・ Retainer 58, 59 ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ Seal 60 ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・Outer joint member 61 ... Stem 62 ...・ ・ Tone wheel 63 ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ Cover 64 ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ Bottom plate 65 ・ ・・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ Peripheral wall 65a ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ Diameter 65b ・ ・ ・ ・ ・ ・ ・ ・・ ・ ・ ・ ・ ・ ・ ・ ・ ・ Small diameter part 66 ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ Holding part 67 ・ ・ ・... harness 68 ... seal rings α, β ... .... Inclination angle

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 accommodated in a freely rolling manner between the rolling surfaces of the inner member and the outer member;
An outer joint that integrally forms a constant velocity universal joint and includes a shoulder portion that abuts against an end face of the inner ring, and a stem portion that extends in the axial direction from the shoulder portion and is fitted into the hub ring via a serration. With members,
The hub wheel and the outer joint member are detachably coupled, and an annular sensor holder attached to an end of the outer member, a rotation speed sensor attached to the sensor holder, and the inner ring In the wheel bearing device with a rotational speed detection device, the encoder having an external fit and having an encoder opposed to the rotational speed sensor via a predetermined air gap,
The sensor holder is fitted to an end of the outer member, is formed in a cup shape, and is a cylindrical fitting portion that is press-fitted into the outer periphery of the outer member. A steel plate cover comprising: a flange portion extending in close contact with the end surface of the outer member; and a bottom portion extending in an axial direction from the flange portion and having a circular hole into which a shoulder portion of the outer joint member is fitted. And a synthetic resin holding portion coupled to one place in the circumferential direction of the bottom portion of the cover, the rotational speed sensor is embedded in the holding portion, and a take- out port made of synthetic resin is provided on the sensor holder. A harness that is integrally coupled to the holding portion by injection molding and is arranged on the inner diameter side of the fitting portion of the cover, and the harness that takes out the output of the rotation speed sensor is rotated through the take-out port provided in the holding portion. is connected to the speed sensor, the outlet is the It provided obliquely along the outer peripheral surface of the side joint member and the rotational speed detector equipped wheel support bearing assembly, characterized in that is set larger than the inclination angle of the outer peripheral surface. 2. The wheel bearing device with a rotation speed detection device according to claim 1, wherein the encoder is a magnetic encoder in which magnetic powder is mixed in an elastomer and magnetic poles N and S are alternately magnetized in a circumferential direction. The bearing device for a wheel with a rotation speed detection device according to claim 1 or 2, wherein an inner edge of the cover is opposed to a shoulder portion of the outer joint member through a slight radial clearance to constitute a labyrinth seal. The wheel bearing device with a rotational speed detecting device according to any one of claims 1 to 3, wherein a stem portion of an outer joint member is fitted to an inner periphery of the hub wheel via a predetermined radial clearance.

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