JP4591954B2 - Wheel bearing device with rotation speed detector - Google Patents

Description

  The present invention relates to a wheel bearing device that rotatably supports a wheel of an automobile or the like with respect to a suspension device, and more particularly to a wheel bearing device with a rotation speed detection device that includes a rotation speed sensor that detects the rotation speed of the wheel. Is.

  A wheel bearing device with a rotational speed detection device that rotatably supports a vehicle wheel with respect to a suspension device, controls an anti-lock brake system (ABS), and detects a rotational speed of the wheel. Conventionally, various structures are known. An example of this conventional structure is shown in FIG.

  In this wheel bearing device with a rotational speed detecting device, double row outer rolling surfaces 60a, 60a are formed on the inner periphery, the outer member 60 serving as a fixed side member, and the double row outer rolling surface 60a on the outer periphery. , 60a, the inner rolling surface 51a, 52a is formed, and the inner member 50 serving as the rotation side member and the double row of the rolling surfaces 60a, 51a and 60a, 52a accommodated so as to roll freely. A rolling element (ball) 61, an annular tone wheel 62 that is fixed to the inner member 50, and whose characteristics in the circumferential direction are changed alternately and at equal intervals, and an inner end opening of the outer member 60 A cover 63 fixed to the ring wheel, an annular rotational speed sensor 64 facing the tone wheel 62, and a sleeve 65 fixed to the peripheral surface of the opening of the cover 63. The cover 63 is fixed to the outer member 60 by press-fitting one peripheral surface of the sleeve 65 to the outer diameter surface of the end portion of the outer member 60.

  The inner member 50 integrally has a wheel mounting flange 53 for mounting a wheel (not shown) at one end, an inner rolling surface 51a on the outer periphery, and a small diameter extending in the axial direction from the inner rolling surface 51a. It consists of a hub wheel 51 formed with a stepped portion 51b and an inner ring 52 fitted on the small-diameter stepped portion 51b and having an inner raceway surface 52a formed on the outer periphery.

The cover 63 includes a synthetic resin main body 66 and a metal sleeve 65. The main body 66 includes a disk portion 66a and a cylindrical portion 66b extending from the disk portion 66a in the axial direction. The rotation speed sensor 64 formed in an annular shape is embedded and supported on the outer surface side of the disk portion 66a. A concave groove 67 surrounded by the large-diameter portion 65a and the step portion 65b of the sleeve 65 is formed at the tip of the cylindrical portion 66b over the entire circumference, and a seal such as an O-ring 68 is provided inside the concave groove 67. The ring is locked. With this configuration, the cover 63 can be attached to and detached from the outer member 60 without damaging the synthetic resin main body 66 constituting the cover 63, and water can be reliably prevented from entering the outer member 60. it can.
JP-A-9-329611

  In such a conventional wheel bearing device with a rotational speed detection device, there is a space between the knuckle N constituting the suspension device and the pilot portion 68 of the outer member 60 (here, the large-diameter portion 65a of the sleeve 65). There is a fitting clearance of about 100 μm, and there is a high possibility that muddy salt water, dust, etc. will enter and rust will occur. If the pilot portion 68 is rusted, the outer member 60 may not be easily removed from the knuckle N.

  Further, since a seal ring such as an O-ring 68 is engaged with a concave groove 67 formed at the tip of the cylindrical portion 66 b of the main body 66 constituting the cover 63, water enters the outer member 60. However, if the pilot portion 68 rusts, the cover 63 moves in the axial direction due to volume expansion of the rust, and the positional relationship between the rotation speed sensor 64 and the tone wheel 62 may be distorted. If this positional relationship is distorted, the accuracy of the output signal of the rotational speed sensor 64 is impaired, and in some cases, the output signal may not be output.

  The present invention has been made in view of such conventional problems, and improves the sealability between the pilot portion of the outer member and the pilot portion and the knuckle, and provides an accurate and stable output signal over a long period of time. An object of the present invention is to provide a wheel bearing device with a rotational speed detection device that can be taken out.

  In order to achieve such an object, the invention according to claim 1 of the present invention includes an outer member fitted into a knuckle that constitutes a suspension device, and an outer circumferential surface of a double row formed on the inner periphery, It has a wheel mounting flange integrally at one end, a hub wheel in which a small diameter step portion extending in the axial direction from the wheel mounting flange is formed on the outer periphery, and an inner ring press-fitted into the small diameter step portion of this hub wheel, An inner member having a double row inner rolling surface facing the outer row rolling surface of the double row on the outer periphery, and a double row of the inner row and the outer member accommodated in a freely rolling manner. A rolling element, a cover made of a synthetic resin main body formed in a cap shape and a metal sleeve, covering a first end opening of the outer member, a pulsar ring mounted on the inner ring, and the pulsar ring And a rotational speed sensor embedded and supported by the main body. In the wheel bearing device with a rotational speed detection device, the cover is formed in a cap shape by press forming a steel plate having corrosion resistance and is held on the outer surface so as to cover the main body, and the cylindrical portion of the knuckle A configuration was adopted in which the outer peripheral member serving as the pilot portion was fitted to the inner diameter of the end portion, an annular elastic member was provided on the outer periphery of the cylindrical portion, and contacted with the inner peripheral surface of the knuckle.

  In this way, the cover is formed into a cap shape by press forming a corrosion-resistant steel plate and is held on the outer surface so as to cover the main body, and the cylindrical part is the inner diameter of the end part of the outer member that becomes the pilot part of the knuckle In addition, an annular elastic member is provided on the outer periphery of the cylindrical portion and is in contact with the inner peripheral surface of the knuckle. Rotation speed detection that can prevent over time and prevent intrusion of muddy salt water, dust, etc. from the pilot part, and improve the sealing performance between the pilot part of the outer member and this pilot part and the knuckle A wheel bearing device with a device can be provided.

  Further, as in the invention of claim 2, if an annular groove is formed in the cylindrical portion of the cover and the elastic member is attached to the annular groove, mud salt water, dust and the like can be generated from the pilot portion with a simple configuration. Infiltration can be prevented.

  Preferably, as in a third aspect of the invention, the cylindrical portion of the cover has a fitting portion that is fitted to the outer member and a protruding ridge portion that is bent and polymerized on the outer diameter side. For example, the cover can be easily positioned with respect to the outer member, and the press-fitting operation of the cover can be simplified, and an accurate air gap adjustment between the rotation speed sensor and the pulsar ring can be performed.

In the invention according to claim 4, if an elastic member having a lip is integrally joined to the ridge portion, the sealing performance can be improved and the assembling workability can be simplified.

  The invention according to claim 5 is characterized in that the pulsar ring has a cylindrical portion fitted to the outer diameter of the inner ring, a standing plate portion extending radially outward from the cylindrical portion, A magnetic encoder that is integrally joined to the side surface, is mixed with ferromagnetic powder made of ferrite or the like in the elastomer, and magnetic poles N and S are alternately magnetized in the circumferential direction; The labyrinth seal is configured to confront the cylindrical part of the sleeve with a slight radial clearance, so that accurate detection accuracy can be obtained at low cost, and the lubricating grease enclosed in the bearing leaks into the cover. The durability of the bearing can be maintained over a long period of time.

  A wheel bearing device with a rotation speed detection device according to the present invention is an inner member fitted into a knuckle constituting a suspension device, and an outer member having a double row outer raceway formed on the inner periphery, and a wheel attached to one end. The hub wheel has a flange integrally formed on the outer periphery with a small-diameter step portion extending in the axial direction from the wheel mounting flange, and an inner ring press-fitted into the small-diameter step portion of the hub wheel. An inner member in which a double row inner rolling surface facing the outer rolling surface of the inner member is formed, a double row rolling element housed in a freely rollable manner between the inner member and the outer member, and a cap A synthetic resin main body formed in a shape and a metal sleeve, a cover for closing one end opening of the outer member, a pulsar ring attached to the inner ring, and facing the pulsar ring, Rotational speed with rotational speed sensor embedded and supported by the main body In the wheel bearing device with a detecting device, the cover is formed in a cap shape by press forming a corrosion-resistant steel plate and is held on the outer surface so as to cover the main body, and the cylindrical portion is a pilot portion of the knuckle. Since the annular elastic member is provided on the outer periphery of the cylindrical portion and is in contact with the inner peripheral surface of the knuckle, the outer member is fitted in the inner diameter of the outer member. The main body made of synthetic resin can be prevented from deteriorating over a long period of time, and intrusion of muddy salt water, dust, etc. from the pilot portion can be prevented. The pilot portion of the outer member and the pilot portion and the knuckle Thus, it is possible to provide a wheel bearing device with a rotational speed detection device with improved sealing performance.

  An outer member that is fitted in a knuckle that constitutes the suspension system and has a double row outer raceway formed on the inner periphery, and a wheel mounting flange that is integrated with one end of the outer member. A double-row inner rolling surface that is formed by a hub ring formed with a small-diameter step portion extending in a direction, and an inner ring press-fitted into the small-diameter step portion of the hub ring, and opposed to the double-row outer rolling surface on the outer periphery. An inner member in which the inner member is formed, a double row rolling element that is rotatably accommodated between the inner member and the outer member, a synthetic resin main body and a metal sleeve formed in a cap shape A rotation cover comprising a cover for closing one end opening of the outer member, a pulsar ring mounted on the inner ring, and a rotational speed sensor opposed to the pulsar ring and embedded and supported by the main body. In the wheel bearing device with a speed detection device, the cover is A steel plate having corrosion resistance is formed into a cap shape by press molding and is held on the outer surface so as to cover the main body, and its cylindrical portion is fitted to the inner diameter of the end portion of the outer member serving as the pilot portion of the knuckle In addition, a convex ridge portion that is bent and polymerized is formed on the cylindrical portion, and an elastic member having a lip is integrally joined to the convex ridge portion, and contacts the inner peripheral surface of the knuckle. ing.

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 detecting device according to the present invention, FIG. 2 is an enlarged view of a main part of FIG. 1, and FIG. 3 is an enlarged main part of a modification of FIG. 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 detecting device includes an inner member 1, an outer member 10, and double-row rolling elements (balls) 6, 6 accommodated between the members 1, 10. . The inner member 1 includes a hub ring 2 and a separate inner ring 3 that is externally fitted to the hub ring 2.

  The hub wheel 2 integrally has a wheel mounting flange 4 for mounting a wheel (not shown) at one end, and a hub bolt 5 for fixing the wheel is provided at a circumferentially equidistant position of the wheel mounting flange 4. It has been planted. On the outer periphery of the hub wheel 2, an inner rolling surface 2a and a small-diameter step portion 2b extending in the axial direction from the inner rolling surface 2a are formed. The inner ring 3 is press-fitted into the small-diameter step portion 2b, and the inner raceway surface 3a with respect to the hub wheel 2 is formed by a caulking portion 2c formed by plastically deforming the end of the small-diameter step portion 2b radially outward. The inner ring 3 formed with is fixed in the axial direction. In this embodiment, by adopting such a self-retain structure, it is not necessary to manage the preload by tightening firmly with a nut or the like as in the prior art, so that the ease of incorporation into the vehicle is simplified. In addition, the preload amount can be maintained for a long time. Further, the protrusion on the inboard side of the hub wheel 2 can be suppressed, and the inner member 1 can be reduced in weight and size.

  The outer member 10 integrally has a vehicle body mounting flange 10b for mounting to the knuckle N on the outer periphery, and double row outer rolling surfaces 10a, 10a are formed on the inner periphery. The double-row outer raceway surfaces 10a and 10a are opposed to the outer circumference of the inner member 1, that is, the double-row inner raceway surfaces 2a and 3a formed integrally on the outer circumference of the hub wheel 2 and the inner ring 3, respectively. Yes. And the double row rolling elements 6 and 6 are accommodated between each rolling surface 10a, 2a and 10a, 3a, and these double row rolling elements 6 and 6 are rollably hold | maintained by the holder | retainers 7 and 7. ing.

  Further, a seal 8 and a cover 9 are attached to the end of the outer member 10 to prevent leakage of lubricating grease sealed inside the bearing and prevent rainwater, dust, etc. from entering the bearing. It is preventing. Such a structure is called a third-generation wheel bearing device. In addition, although the double row angular contact ball bearing which used the rolling elements 6 and 6 as the ball | bowl was illustrated here, the double row tapered roller bearing which uses a tapered roller for a rolling element may be sufficient not only in this.

  The hub wheel 2 is formed of medium carbon steel containing carbon of 0.40 to 0.80 wt% such as S53C, and includes an inner rolling surface 2a on the outboard side, a seal land portion in which the seal 8 is in sliding contact, and a small diameter step. The surface hardness is hardened in the range of 58 to 64 HRC by induction hardening over the part 2b. The caulking portion 2c is an unquenched portion having a material surface hardness of 25 HRC or less after forging. On the other hand, the inner ring 3 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 part by quenching.

  The outer member 10 is made of medium carbon steel containing carbon 0.40 to 0.80 wt% such as S53C, and the double row outer rolling surfaces 10a and 10a have a surface hardness of 58 to 64HRC by induction hardening. It has been cured to the extent of.

  A slinger 11 is press-fitted into the outer diameter surface of the inner ring 3. The slinger 11 is made of a ferromagnetic steel plate, for example, a ferritic stainless steel plate (JIS standard SUS430 type or the like) or a rust-proof cold rolled steel plate (JIS standard SPCC type or the like). It has a portion 11a and a standing plate portion 11b extending radially outward from the cylindrical portion 11a, and is formed in an annular shape as a whole in a substantially L-shaped cross section by pressing. A magnetic encoder (pulsar ring) 12 is integrally joined to the inboard side surface of the upright plate portion 11b by vulcanization adhesion or the like.

  This magnetic encoder 12 is made by mixing a ferromagnetic powder made of ferrite or the like into an elastomer made of rubber or the like, so that the magnetic poles N and S are alternately arranged in the circumferential direction at a predetermined pitch diameter (PCD). It is magnetized and constitutes a rotary encoder for detecting the wheel rotation speed. In this example, the magnetic encoder 12 is made of an elastomer. However, the present invention is not limited to this. For example, the magnetic encoder 12 may be made of sintered metal obtained by hardening a ferromagnetic powder made of ferrite or the like with a metal binder.

  In the present embodiment, the cover 9 includes a synthetic resin main body 13 and a steel sheet sleeve 14 that is wrapped so as to cover the outer surface of the main body 13, and is attached to the end of the outer member 10. The opening on the inboard side of the outer member 10 is closed. The main body 13 is made of PA (polyamide) based synthetic resin such as nylon 66, PPA (polyphthalamide), or PPS (polyphenylene sulfide), and is formed in a cap shape having a bottom portion 13a and a cylindrical portion 13b. A rotation speed sensor 15 is embedded in the outer diameter portion of the bottom portion 13a, and is disposed opposite to the magnetic encoder 12 via a predetermined axial gap (air gap) and takes out a detection signal of the rotation speed sensor 15. 16 is integrally formed.

  When the magnetic encoder 12 rotates together with the inner ring 3 with the rotation of the wheel, the output of the rotation speed sensor 15 facing the magnetic encoder 12 changes. Since the frequency at which the output of the rotational speed sensor 15 changes is proportional to the rotational speed of the wheel, the ABS can be appropriately controlled by inputting the output signal of the rotational speed sensor 15 to a controller (not shown).

  The sleeve 14 is made of corrosion-resistant austenitic stainless steel plate (JIS standard SUS304 type or the like) or rust-proof cold rolled steel plate (JIS standard SPCC type or the like). 18 and a cap shape.

  As shown in an enlarged view in FIG. 2, the cylindrical portion 17 of the sleeve 14 is overlapped with a fitting portion 17 a that is press-fitted into the inner peripheral surface of the pilot portion 10 c in the outer member 10, and is bent and polymerized on the outer diameter side. It has a ridge 17b that serves as a positioning portion of the sleeve 14 during press-fitting. An annular seal lip 19 made of an elastic member such as rubber is integrally vulcanized and bonded to the ridge portion 17b and is in contact with the inner peripheral surface of the knuckle N.

  Thus, in this embodiment, the sleeve 14 fixed to the pilot portion 10c of the outer member 10 is formed of a corrosion-resistant steel plate, and the seal lip 19 that contacts the inner peripheral surface of the knuckle N is thus provided. Since it is integrally joined to the sleeve 14, deterioration of the synthetic resin main body 13 can be prevented over a long period of time in an adverse environment such as muddy salt water, and muddy salt water, dust or the like can enter from the pilot portion 10c. Therefore, it is possible to provide a wheel bearing device with a rotational speed detection device in which the pilot portion 10c of the outer member 10 and the sealability between the pilot portion 10c and the knuckle N are improved. Therefore, the detection accuracy of the rotation speed sensor 15 is not lowered due to the trouble that the outer member 10 cannot be removed from the knuckle N due to rust or the expansion of rust.

  FIG. 3 shows a modification of FIG. 2, and an annular seal lip 20 made of an elastic member such as rubber is integrally vulcanized and bonded to the protruding portion 17 b of the cylindrical portion 17 of the sleeve 14. The peripheral surface and the pilot member 10c of the outer member 10 are in close contact with each other. Thereby, it can further prevent that muddy salt water, dust, etc. permeate from pilot part 10c.

  FIG. 4 is a main part enlarged view showing another embodiment of the wheel bearing device with a rotational speed detection device according to the present invention. Note that the same components and parts as those in the above-described embodiment are denoted by the same reference numerals, and redundant description is omitted.

  The sleeve 21 is made of corrosion-resistant austenitic stainless steel plate (JIS standard SUS304 type or the like) or rust-proof cold rolled steel plate (JIS standard SPCC type or the like), and is formed into a cap shape by press molding. ing.

  The cylindrical portion 22 of the sleeve 21 includes a fitting portion 17a that is press-fitted into the inner peripheral surface of the pilot portion 10c of the outer member 10, a protruding strip portion 17b that is bent and polymerized on the outer diameter side, and the protruding strip portion. And a guide portion 17c extending in the axial direction from 17b. An annular groove 23 is formed in the guide portion 17c, and a seal ring 24 such as an O-ring is attached to the annular groove 23. The seal ring 24 is in contact with the inner peripheral surface of the knuckle N and prevents muddy salt water, dust and the like from entering the inside of the bearing and the pilot portion 10c.

  Here, the labyrinth seal 25 is configured such that the outer diameter edge of the slinger 11 press-fitted into an inner ring (not shown) is opposed to the cylindrical portion 22 of the sleeve 21 through a slight radial clearance. As a result, it is possible to prevent the lubricating grease sealed in the bearing with a simple configuration from leaking into the cover 21 and maintain the durability of the bearing for a long period of time.

  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 rotational speed detection device according to the present invention is not limited to the third generation structure, and can be applied to the first or second generation structure. In addition, the pulsar ring is exemplified by a magnetic encoder in which the magnetic poles N and S are alternately magnetized in the circumferential direction. However, the present invention is not limited to this, and the pulsar ring may be one in which irregularities or through holes are formed in the circumferential direction. Therefore, in accordance with the pulsar ring type, the rotation speed sensor can be applied by appropriately selecting a Hall IC element, a magnetoresistive element (MR element) or the like.

It is a longitudinal cross-sectional view which shows embodiment of the bearing apparatus for wheels with a rotational speed detection apparatus which concerns on this invention. It is a principal part enlarged view of FIG. It is a principal part enlarged view which shows the modification of FIG. It is a principal part enlarged view which shows other embodiment of the wheel bearing apparatus with a rotational speed detection apparatus 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.

Explanation of symbols

1 ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ Inner member 2 ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ Hub wheel 2a, 3a ・ ・ ・ ・ ・ ・ ・ ・・ ・ ・ ・ Inner rolling surface 2b ・ ・ ・ ・ ・ ・ Small diameter step 2c ・ ・ ・ ・ ・ ・ Clamping part 3・ ・ ・ ・ ・ ・ ・ ・ Inner ring 4 ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ Wheel mounting flange 5 ・ ・ ・ ・ ・ ・ ・ ・ ・ ・・ Hub bolt 6 ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ Rolling element 7 ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ Retainer 8 ・ ・ ・ ・ ・ ・・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ Seal 9 ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ Cover 10 ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ External member 10a ・ ・ ・ ・Outer rolling surface 10b ... Car body mounting flange 10c ...・ Pilot part 11 ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ Slinger 11a, 13b, 17, 22 ・ ・ ・ ・ Cylindrical part 11b ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ Vertical plate Part 12 ... Magnetic encoder 13 ... Main bodies 13a, 18 ... Bottom 14, 21... Sleeve 15... Rotational speed sensor 16. ··· Connector 17a ··········· Fitting portion 17b ·············································・ ・ ・ ・ Guide parts 19 and 20 ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ Seal lip 23 ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ Annular groove 24 ・ ・ ・ ・ ・ ・ ・ ・.... Seal ring 25 .... Labyrinth seal 50 ... Inner member 51 ... Hub wheels 51a, 52a・ ・ ・ ・ ・ ・ ・ ・ ・ Inner rolling surface 51b ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ Small diameter step 52 ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ Inner ring 53 ..... Wheel mounting flange 60 ..... Outer member 60a ... -Outer rolling surface 61 ... Rolling element 62 ... Tone wheel 63 ...・ ・ ・ ・ ・ ・ ・ Cover 64 ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ Rotational speed sensor 65 ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ Sleeve 65a・ ・ ・ ・ ・ ・ ・ ・ ・ Large-diameter portion 65b ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ Step Part 66 ... Main body 66a ... Disk part 66b ...・ Cylindrical part 67 ... O-ring 68 ... Pilot part N ... ······knuckle

Claims (5)

An outer member that is fitted into a knuckle that constitutes the suspension device, and has a double row outer rolling surface formed on the inner periphery;
It has a wheel mounting flange integrally at one end and a hub wheel formed with a small diameter step portion extending in the axial direction from the wheel mounting flange on the outer periphery, and an inner ring press-fitted into the small diameter step portion of the hub wheel, An inner member in which a double row inner rolling surface facing the outer row rolling surface of the double row is formed on the outer periphery;
A double row rolling element accommodated between the inner member and the outer member so as to roll freely;
A cover made of a synthetic resin main body and a metal sleeve formed in a cap shape, and a cover for closing one end opening of the outer member;
A pulsar ring attached to the inner ring;
In the wheel bearing device with a rotational speed detection device provided with a rotational speed sensor that is embedded and supported by the main body in opposition to the pulsar ring,
The cover is formed of a corrosion-resistant steel plate in a cap shape by press molding and is held on the outer surface so as to cover the main body, and the cylindrical portion has an inner diameter at the end of the outer member that serves as a pilot portion of the knuckle A wheel bearing device with a rotational speed detecting device, wherein an annular elastic member is provided on the outer periphery of the cylindrical portion and is brought into contact with the inner peripheral surface of the knuckle.   The wheel bearing device with a rotation speed detecting device according to claim 1, wherein an annular groove is formed in the cylindrical portion of the cover, and the elastic member is mounted in the annular groove.   The rotational speed detection device according to claim 1, wherein the cylindrical portion of the cover has a fitting portion that is fitted to the outer member and a protruding ridge portion that is bent and polymerized on the outer diameter side. Bearing device for attached wheels.   The wheel bearing device with a rotational speed detection device according to claim 3, wherein an elastic member having a lip is integrally joined to the protruding strip portion.   The pulsar ring is integrally joined to a cylindrical portion fitted to the outer diameter of the inner ring, a standing plate portion extending radially outward from the cylindrical portion, and a side surface of the standing plate portion. A magnetic encoder in which magnetic poles N and S are alternately magnetized in the circumferential direction. The outer diameter edge of the vertical plate portion has a slight radial clearance in the cylindrical portion of the sleeve. The wheel bearing device with a rotational speed detection device according to any one of claims 1 to 4, wherein a labyrinth seal is configured to face each other.

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