JP2005324736A - Bearing device for wheel - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a bearing device for a wheel reduced in weight and made compact without lowering durability of an inner ring by corrosion and hydrogen embrittlement. <P>SOLUTION: In this device, a caulking part 2c is formed by plastically deforming an end part of a small diameter step part 2b of a hub ring 2 radially outward, and an inner ring 3 is fixed by the caulking part 2c. A sealing device 9 is mounted in an annular space of the inner wheel 3 and an outward member 10. The sealing device 9 is provided with an encoder 16b. A rotational speed sensor 17 facing to the encoder 16b is mounted on a knuckle N. An circular annular shaped sensor cover 18 is mounted at an end part of the inner ring 3. The rotational speed sensor 17 is protected by the sensor cover 18. The sealing member 19 is integrally formed on the sensor cover 18. The sealing member 19 abuts on an outside joint member 11 constituting a constant speed universal joint. <P>COPYRIGHT: (C)2006,JPO&NCIPI

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 that improves the durability of an inner ring that is press-fitted into a hub wheel.

  A wheel bearing device that rotatably supports a wheel with respect to a suspension device of an automobile has been made lighter and more compact for improving fuel efficiency, not to mention cost reduction. As a representative of these wheel bearing devices, both the inner member and the outer member have a flange integrally, and one inner rolling surface in the double row rolling bearing is formed directly on the hub wheel, and the other A so-called third-generation wheel bearing device is known in which an inner rolling surface is formed in a separate inner ring press-fitted into a hub ring.

  FIG. 7 shows a third-generation wheel bearing device on the driven wheel side, which includes a hub wheel 51, an inner ring 52, an outer ring 53, and double-row rolling elements 54 and 54. The hub wheel 51 integrally has a wheel mounting flange 55 for mounting a wheel (not shown) at one end thereof, an inner rolling surface 51a on the outer periphery, and a small diameter extending in the axial direction from the inner rolling surface 51a. A step portion 51b is formed. Further, hub bolts 56 for fixing the wheels are planted at the circumferentially equidistant positions of the wheel mounting flanges 55. An inner ring 52 having an inner rolling surface 52a formed on the outer periphery is press-fitted into the small diameter step portion 51b of the hub wheel 51. The inner ring 52 is prevented from coming off from the hub wheel 51 in the axial direction by a caulking portion 51c formed by plastically deforming the end portion of the small diameter step portion 51b of the hub wheel 51 radially outward. .

  The outer ring 53 integrally has a vehicle body mounting flange 53b on the outer periphery, and double row outer rolling surfaces 53a and 53a are formed on the inner periphery. Between the inner rolling surfaces 51a and 52a facing the double-row outer rolling surfaces 53a and 53a, double-row rolling elements 54 and 54 are accommodated so as to roll freely.

  The hub wheel 51 is integrally formed by forging a carbon steel material having a carbon content of 0.40 to 0.80% by weight, and a portion indicated by an oblique lattice, that is, a wheel mounting flange 55. The surface is hardened by induction hardening or the like from the base portion to the inner rolling surface 51a and the small diameter step portion 51b. In addition, the caulking part 51c is left with the raw material surface hardness after forging. On the other hand, the inner ring 52 is made of high carbon steel such as high carbon chromium bearing steel such as SUJ2, and is hardened and hardened to the core.

As a result, a low-cost and sufficiently durable wheel bearing device can be realized, and the caulking portion 51c can be prevented from being damaged, such as a crack, and fixed to the hub wheel 51 by the caulking portion 51c. It is possible to prevent the diameter of the inner ring 52 from changing to an extent that causes a practical problem. And while reducing possibility that this inner ring | wheel 52 will be damaged with the fixing operation | work, a preload can be maintained to an appropriate value, and also cost reduction can be aimed at by reduction of a number of parts, parts processing, and an assembly man-hour.
Japanese Patent Laid-Open No. 11-129703

  However, when the inner ring 52 is fixed by a caulking portion 51c formed by plastically deforming an end portion of the small diameter step portion 51b radially outward, in the caulking step, the vicinity of the caulking portion 51c of the small diameter step portion 51b. Since the inner ring 52 is deformed in the radial direction, the inner diameter of the inner ring 52 is expanded, and it cannot be denied that a hoop stress is generated in the inner ring 52.

  In addition, this type of wheel bearing device is used in a state where it is exposed to a severe external environment on the road surface, and is often subjected to muddy water. Furthermore, salt water is sprinkled in coastal areas, and anti-freezing agents may be sprinkled in cold regions, and muddy water containing salt in the anti-freezing agents is sprinkled. Since the wheel bearing device, in particular, the inner ring 52 is exposed as it is with a steel base, there is a risk of corrosion due to salt damage when salt mud is sprinkled. When the corrosion of this part progresses under such circumstances, the diffusible hydrogen existing in the environment penetrates into the structure of the inner ring 52 and causes hydrogen embrittlement, which breaks the metal grain boundary, so-called “delay”. “Destruction” may occur, which is not preferable.

  The present invention has been made in view of such circumstances, and aims to provide a wheel bearing device that is lightweight and compact and does not cause deterioration in durability of the inner ring due to corrosion and hydrogen embrittlement. It is said.

  In order to achieve such an object, the invention according to claim 1 of the present invention is a hub wheel in which a wheel mounting flange is integrally formed at one end portion and a small-diameter step portion extending in the axial direction is formed from the wheel mounting flange. An inner member that is externally fitted to the small-diameter step portion of the hub wheel, an outer member that is externally attached to the inner member and attached to a knuckle that constitutes the suspension device, and the outer member A plurality of rolling elements housed between the member and the inner member so as to be freely rollable, and the inner ring is formed by a caulking portion formed by plastically deforming an end portion of the small diameter step portion radially outward. In the wheel bearing device fixed in the axial direction, a seal member is attached to an end of the inner ring, and the seal member is in contact with an outer joint member constituting a constant velocity universal joint.

  Thus, in the wheel bearing device, the seal member is attached to the end of the inner ring, and this seal member is in contact with the outer joint member constituting the constant velocity universal joint. Even when stress is generated, it is possible to prevent the inner ring or the caulking portion from being sprinkled with muddy water containing salt, and at least corrosion due to salt damage can be suppressed in the inner ring. Therefore, it is possible to prevent diffusible hydrogen existing in the environment from entering the inner ring structure, becoming hydrogen embrittled, and causing delayed fracture. By adopting such a configuration, it is possible to provide a wheel bearing device that achieves light weight and compactness and does not cause a decrease in durability of the inner ring due to corrosion and hydrogen embrittlement.

  In the invention according to claim 2, since the lip is integrally formed on the seal member and the lip is in contact with the outer periphery of the caulking portion, the outer diameter of the caulking portion varies. However, the seal lip can follow the outer periphery of the caulking portion, and can further prevent rainwater, dust, and the like from entering the inner ring or the contact portion between the inner ring and the caulking portion.

  Preferably, as in the third aspect of the present invention, if a lubricant is applied to the outer periphery of the caulking portion, the outer periphery of the caulking portion may vary even if the outer diameter of the caulking portion varies. A slight gap generated between the sealing lip and the sealing lip can be sealed with this lubricant, and the sealing performance is further improved.

  According to a fourth aspect of the present invention, a seal device is mounted in the annular space of the inner ring and the outer member, an encoder is provided in the seal device, and a rotational speed sensor facing the encoder is mounted on the knuckle. In addition, an annular sensor cover is attached to the end of the inner ring, the rotation speed sensor is protected by the sensor cover, and the seal member is integrally formed with the sensor cover, so that it can be rotated from a stepping stone or the like. It can protect the detection part of the speed sensor, improve the durability of the rotation speed sensor, improve the reliability of detection accuracy, and sprinkle salty muddy water etc. on the inner ring and caulking part Can be prevented.

  Further, in the invention described in claim 5, since a slight radial clearance is formed between the sensor cover and the knuckle and a labyrinth seal is formed, stepping stones, muddy water, etc. are present in the detection part of the rotation speed sensor. Intrusion can be prevented, and the durability of the rotation speed sensor can be improved and the reliability of detection accuracy can be improved.

  Further, in the invention according to claim 6, since a slight radial clearance is formed between the outer joint member and the knuckle and a labyrinth seal is formed, the outer joint member is conventionally provided at the outer diameter. In addition, it is possible to eliminate the sealing device composed of a shield and the like, the number of parts can be eliminated, the cost can be reduced, and rainwater, dust and the like can be prevented from entering the inner ring and the caulking portion.

  A wheel bearing device according to the present invention has a wheel mounting flange integrally formed at one end, a hub wheel formed with a small diameter step portion extending in the axial direction from the wheel mounting flange, and a small diameter step portion of the hub wheel. An inner member composed of an outer ring fitted to the outer ring, an outer member that is extrapolated to the inner member and attached to a knuckle constituting a suspension device, and rolls between the outer member and the inner member. The inner ring is fixed in the axial direction by a caulking portion formed by plastically deforming an end of the small diameter step portion radially outward. A seal member is attached to the end of the inner ring, and this seal member is in contact with the outer joint member constituting the constant velocity universal joint. Therefore, even if hoop stress is generated in the inner ring during the caulking process, the inner ring or the caulking Can prevent muddy water containing salt from sprinkling Both can be prevented from corrosion due to salt damage occurs in the inner ring. Therefore, it is possible to prevent diffusible hydrogen existing in the environment from entering the inner ring structure, becoming hydrogen embrittled, and causing delayed fracture. By adopting such a configuration, it is possible to provide a wheel bearing device that achieves light weight and compactness and does not cause a decrease in durability of the inner ring due to corrosion and hydrogen embrittlement.

  A wheel mounting flange is integrally formed at one end, an inner rolling surface on the outer periphery, a hub wheel formed with a small-diameter step portion extending in the axial direction from the inner rolling surface, and externally fitted to the small-diameter step portion, An inner member comprising an inner ring having an inner raceway formed on the outer periphery, an outer member extrapolated to the inner member, and the outer member and the inner member are rotatably accommodated. A wheel bearing device in which the inner ring is fixed in the axial direction by a caulking portion formed by plastically deforming an end of the small diameter step portion radially outward. A seal device is mounted in the annular space of the outer member, and an encoder is provided in the seal device. A rotation speed sensor facing the encoder is mounted on the knuckle, and an annular sensor is mounted on the end of the inner ring. A cover is attached and the sensor cover The rotational speed sensor is protected, yet the sensor cover the sealing member is integrally formed, into contact with the outer joint member the seal member constituting the constant velocity universal joint.

Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.
FIG. 1 is a longitudinal sectional view showing a first embodiment of a wheel bearing device according to the present invention. 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).

  The wheel bearing device includes an inner member 1, an outer member 10, and double-row rolling elements (balls) 6, 6 accommodated between the members 1, 10 so as to roll freely. 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 an end portion on the outboard side, and the wheel is fixed at a circumferentially equidistant position of the wheel mounting flange 4. The hub bolt 5 is planted. Further, an inner raceway surface 2a and a small-diameter step portion 2b extending in the axial direction from the inner raceway surface 2a are formed on the outer periphery of the hub wheel 2. The inner ring 3 having the inner raceway surface 3a formed on the outer periphery is press-fitted into the small-diameter step portion 2b, and the end portion of the small-diameter step portion 2b is plastically deformed outward in the radial direction. Thus, the inner ring 3 is prevented from coming off in the axial direction with respect to the hub ring 2. 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.

  The outer member 10 integrally has a vehicle body mounting flange 10b for mounting to a vehicle body (not shown) on the outer periphery, and double row outer rolling surfaces 10a, 10a are formed on the inner periphery. 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, seal devices 8 and 9 are mounted at the end of the outer member 10 to prevent leakage of the lubricating grease sealed inside the bearing and prevent intrusion of rainwater or dust from the outside.

  Here, the wheel bearing device referred to as the third generation in which the inner raceway surface 2a is directly formed on the outer periphery of the hub wheel 2 is illustrated, but the wheel bearing device according to the present invention is not limited to such a structure. For example, it may be a first generation or second generation structure in which a pair of inner rings are press-fitted into a small diameter step portion of a hub ring. In addition, although the double row angular contact ball bearing which used the rolling elements 6 and 6 as the ball | bowl was illustrated, it is not restricted to this, The double row tapered roller bearing which uses a tapered roller for a rolling element may be sufficient.

  The hub wheel 2 is formed of medium carbon steel containing carbon of 0.40 to 0.80% by weight such as S53C, and includes an inner rolling surface 2a on the outboard side, a seal land portion to which the seal device 8 is slidably contacted, and The surface hardness is set to a range of 54 to 64 HRC by induction hardening over the small diameter step 2b. The caulking portion 2c is an unquenched portion having a surface hardness of 24HRC 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 54 to 64 HRC up to the core portion by quenching.

  Further, the outer member 10 is formed of medium carbon steel containing 0.40 to 0.80 wt% of carbon such as S53C, and the sealing devices 8 and 9 including the double row outer raceway surfaces 10a and 10a are fitted. The surface hardness is hardened in the range of 54 to 64 HRC by induction hardening over the inner diameter surface of the end portion to be joined.

  In the present embodiment, zinc-nickel alloy plating is applied after width grinding of the inner ring 3. That is, since the inner rolling surface 3a and the inner diameter surface are ground after the width grinding, the zinc-nickel alloy film 3b having excellent corrosion resistance is formed on the outer diameter surface and the width surface of the inner ring 3. This zinc-nickel alloy plating contains 5 to 10% of nickel and is colored chromate. This zinc-nickel alloy has a higher surface hardness and higher wear resistance than galvanized or the like. In addition, although it is possible that the one where the film thickness is as thick as 6 to 10 [mu] m exhibits a strong rust preventive power in a harsh environment, in this embodiment, the thickness is restricted to 5 [mu] m or less due to accuracy restrictions.

  FIG. 2 is an enlarged view of a main part of FIG. 1, but an outer joint member 11 constituting a constant velocity universal joint (not shown) is fitted in the hub wheel 2. The hub wheel 2 and the outer joint member 11 are integrally fixed in the axial direction in a state where the caulking portion 2 c is abutted against the shoulder portion 12 of the outer joint member 11.

  Here, the sealing device 9 on the inboard side includes annular first and second sealing plates 13 and 14 that are respectively attached to the outer member 10 and the inner ring 3 and have a substantially L-shaped cross section. Opposed to each other. The second seal plate 14 includes a cylindrical portion 14a that is externally fitted to the inner ring 3, and a standing plate portion 14b that extends radially outward from the cylindrical portion 14a. The second seal plate 14 is formed by pressing a ferritic stainless steel plate (JIS standard SUS430 system or the like) or a cold rolled steel plate (JIS standard SPCC system or the like), and has a substantially L-shaped cross section. Are formed in an annular shape as a whole.

  On the other hand, the first seal plate 13 includes a cylindrical portion 13a fitted in the outer member 10 and a standing plate portion 13b extending radially inward from one end of the cylindrical portion 13a. A seal member 15 integrally having a slip 15b and an intermediate lip 15c is bonded by vulcanization. The seal member 15 is made of an elastomer such as rubber.

  Here, the side lip 15a is in sliding contact with the standing plate portion 14b of the second seal plate 14, and the grease lip 15b and the intermediate lip 15c are in sliding contact with the cylindrical portion 14a of the second seal plate 14, respectively. A magnetic encoder 16 in which a magnetic substance powder such as ferrite is mixed in an elastomer such as rubber is integrally vulcanized and bonded to the surface on the inboard side of the standing plate portion 14b. The magnetic encoder 16 has magnetic poles N and S alternately magnetized in the circumferential direction, and constitutes a rotary encoder for detecting wheel rotation speed.

  A rotational speed sensor 17 is disposed opposite to the magnetic encoder 16 via a predetermined axial clearance. The rotational speed sensor 17 is attached to the knuckle N, and the detection portion 17a is protected by a sensor cover 18 fitted on the inner ring 3. The sensor cover 18 includes a cylindrical portion 18a that is externally fitted to the inner ring 3, and a vertical plate portion 18b that extends radially outward from the cylindrical portion 18a. The austenitic stainless steel plate (JIS standard SUS403 series or the like) A cold-rolled steel plate (JIS standard SPCC or the like) is formed into an annular shape as a whole in a substantially L-shaped cross section by pressing.

  In the present embodiment, a seal member 19 made of an elastomer such as rubber is integrally vulcanized and bonded to the inboard side surface of the upright plate portion 18b. The tip of the seal member 19 is in contact with the outer periphery of the shoulder 12 of the outer joint member 11. Thereby, the detection part 17a can be protected from a stepping stone or the like, and the durability of the rotation speed sensor 17 can be improved and the reliability of detection accuracy can be improved. Further, the inner ring 3 and the caulking portion 2c are prevented from being exposed, and rainwater, dust and the like from the outside are prevented from entering this portion. Accordingly, at least the inner ring 3 can be prevented from being corroded by salt damage, and diffusible hydrogen existing in the environment can penetrate into the structure of the inner ring 3 and become hydrogen embrittled, thereby preventing delayed fracture. be able to.

  FIG. 3 is an enlarged view showing a main part of a second embodiment of the wheel bearing device according to the present invention. The same parts as those in the first embodiment (FIG. 2) are denoted by the same reference numerals, and detailed description thereof is omitted.

  A rotational speed sensor 17 is disposed opposite to the magnetic encoder 16 via a predetermined axial clearance. The rotation speed sensor 17 is attached to the knuckle N, and the detection portion 17a is protected by a sensor cover 20 that is externally fitted to the inner ring 3. The sensor cover 20 includes a cylindrical portion 20a that is externally fitted to the inner ring 3, a superposed portion 20b that is in close contact with the end surface of the inner ring 3 from the cylindrical portion 20a, and a vertical plate portion 20c that extends radially outward from the superposed portion 20b. And is formed in an annular shape as a whole in a substantially L-shaped cross section.

  In the present embodiment, the sealing member 21 made of an elastomer such as rubber is integrally vulcanized and bonded to the overlapping portion 20b from the surface on the inboard side of the standing plate portion 20c as in the above-described embodiment. Thereby, in addition to the increase in rigidity of the sensor cover 20 itself, the bonding strength of the seal member 21 can be increased. The seal member 21 is in contact with the outer periphery of the shoulder portion 12 of the outer joint member 11.

  FIG. 4 is an enlarged view of a main part showing a third embodiment of the wheel bearing device according to the present invention. Note that this embodiment is a modification of the first embodiment (FIG. 2) described above, and only the configuration of the seal member is different. Is omitted.

  In the present embodiment, the sealing member 21 made of an elastomer such as rubber is integrally vulcanized and bonded from the surface on the inboard side of the standing plate portion 18b to the cylindrical portion 18a. Thereby, in addition to the increase in rigidity of the sensor cover 18 itself, the bonding strength of the seal member 22 can be increased. The seal member 22 is in contact with the outer periphery of the shoulder portion 12 of the outer joint member 11.

  FIG. 5 is an enlarged view of a main part showing a fourth embodiment of the wheel bearing device according to the present invention. In addition, the same code | symbol is attached | subjected to the same components same site as embodiment mentioned above, and the detailed description is abbreviate | omitted.

  The sensor cover 23 includes a cylindrical portion 23a fitted to the inner ring 3, a small diameter portion 23b extending in the axial direction from the cylindrical portion 20a, and a standing plate portion 23c extending radially outward from the small diameter portion 23b. It is formed in an annular shape as a whole in a substantially L shape. A seal member 24 made of an elastomer such as rubber is integrally vulcanized and bonded to the small diameter portion 23b from the surface on the inboard side of the upright plate portion 23c as in the above-described embodiment. Thereby, in addition to the increase in rigidity of the sensor cover 23 itself, the bonding strength of the seal member 24 can be increased.

  A seal lip 24a is integrally formed on the inner diameter of the seal member 24. The seal member 24 abuts against the shoulder portion 12, and the tip end portion of the seal lip 24a abuts on the outer periphery of the caulking portion 2c. Thereby, even if the outer diameter size of the caulking portion 2c varies, the seal lip 24a can follow the outer periphery of the caulking portion 2c. Therefore, it is possible to reliably prevent rainwater, dust and the like from entering the inner ring 3 and prevent corrosion due to salt damage. Further, by applying a lubricant such as grease to the outer periphery of the caulking portion 2c, even if there is a variation in the outer diameter, a slight amount generated between the outer periphery of the caulking portion 2c and the seal lip 24a. The gap can be sealed with this lubricant, and the sealing performance can be improved.

  FIG. 6 is an enlarged view showing a main part of a fifth embodiment of the wheel bearing device according to the present invention. This embodiment is a modification of the first embodiment (FIG. 2) described above, and the same reference numerals are assigned to the same parts of the same parts, and detailed description thereof is omitted.

  A slight radial clearance is formed between the standing plate portion 18 b of the sensor cover 18 and the knuckle N, and a labyrinth seal 25 is configured. Thereby, it is possible to prevent stepping stones, muddy water and the like from entering the detection unit 17a of the rotation speed sensor 17, and it is possible to improve the reliability of the detection accuracy as well as the durability of the rotation speed sensor 17.

  Furthermore, a slight radial clearance is also formed between the outer joint member 11 and the knuckle N, and the labyrinth seal 26 is configured. As a result, it is possible to abolish a sealing device made up of a shield or the like that has been provided on the outer diameter of the outer joint member in the prior art, and to reduce costs by reducing the number of parts, and to prevent rainwater and Intrusion of dust or the like can be prevented, and corrosion due to salt damage can be reliably prevented.

  In the present embodiment, since the outer diameter Da of the sensor cover 18 and the outer diameter Db of the shoulder portion 12 of the outer joint member 11 are set to substantially the same diameter, the sealing performance can be improved more effectively.

  The wheel bearing device according to the present invention has a so-called self-retaining structure in which an inner ring is press-fitted into a small-diameter step portion of a hub wheel, and the inner ring is fixed by a caulking portion formed by plastic deformation of an end portion of the small-diameter step portion. The present invention can be applied to first-generation to third-generation wheel bearing devices.

It is a longitudinal section showing a 1st embodiment of a bearing device for wheels concerning the present invention. It is a principal part enlarged view same as the above. It is a principal part enlarged view which shows 2nd Embodiment of the wheel bearing apparatus which concerns on this invention. It is a principal part enlarged view which shows 3rd Embodiment of the wheel bearing apparatus which concerns on this invention. It is a principal part enlarged view which shows 4th Embodiment of the wheel bearing apparatus which concerns on this invention. It is a principal part enlarged view which shows 5th Embodiment of the wheel bearing apparatus which concerns on this invention. It is a longitudinal cross-sectional view which shows the conventional wheel bearing apparatus.

Explanation of symbols

1 ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ Inner member 2 ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ hub wheels 2a, 3a・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ Inner rolling surface 2b ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ Small diameter step 2c ・ ・ ・ ・ ・ ・・ ・ ・ ・ ・ ・ ・ ・ Clamping part 3 ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ Inner ring 3b ・ ・ ・ ・ ・ ・···································. ································································· Hold 8, 9... ...... Sealing device 10... ...・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ Outer rolling surface 10b ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ Car body mounting flange 11 ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ Outer joint member 12 ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ Shoulder 13 ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・..First seal plates 13a, 14a, 18a, 20a, 23a ..Cylindrical portions 13b, 14b, 18b, 20c, 23c ..Standing plate portion 14 .... Second seal plates 15, 19, 21, 22, 24 ......... Seal member 15a ......... Side lip 15b ... Grease lip 15c ... Intermediate lip 16 ... ... Encoder 17 ... rotational speed sensor 17a ... detector 18, 20, 23 ... Sensor cover 19 ... Seal member 20b ...・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ Polymerization part 23b ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ Small diameter part 24a ・ ・ ・ ・ ・ ・ ・ ・・ ・ ・ ・ ・ ・ Seal lip 25, 26 ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ Labyrinth seal 51 ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・・ Hub wheels 51a, 52a ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ Inner rolling surface 51b ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ Small diameter step 51c ・・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ Caulking part 51d ・ ・・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ Step 52 ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ Inner ring 53 .... Outer ring 53a ... Outer rolling surface 53b ... .... Car body mounting flange 54 ... Rolling element 55 ... Wheel mounting flange 56 ... Hub bolt 57 ... Back side outer diameter chamfer N ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ Knuckle

Claims (6)

An inner ring consisting of a hub ring integrally having a wheel mounting flange at one end, a small-diameter step portion extending in the axial direction from the wheel mounting flange, and an inner ring externally fitted to the small-diameter step portion of the hub ring A member, an outer member extrapolated to the inner member and attached to a knuckle constituting a suspension device, and a double row rolling element housed in a freely rollable manner between the outer member and the inner member A wheel bearing device in which the inner ring is fixed in the axial direction by a caulking portion formed by plastically deforming an end portion of the small-diameter stepped portion radially outward,
A wheel bearing device, wherein a seal member is attached to an end portion of the inner ring, and the seal member is in contact with an outer joint member constituting a constant velocity universal joint.   The wheel bearing device according to claim 1, wherein a lip is formed integrally with the seal member, and the lip is in contact with an outer periphery of the caulking portion.   The wheel bearing device according to claim 2, wherein a lubricant is applied to an outer periphery of the caulking portion.   A seal device is mounted in the annular space of the inner ring and the outer member, and an encoder is provided in the seal device. A rotation speed sensor facing the encoder is mounted on the knuckle, and an annular portion is provided at the end of the inner ring. The wheel bearing device according to any one of claims 1 to 3, wherein the sensor cover is attached, the rotational speed sensor is protected by the sensor cover, and the seal member is integrally formed with the sensor cover.   The wheel bearing device according to any one of claims 1 to 4, wherein a slight radial clearance is formed between the sensor cover and the knuckle to form a labyrinth seal.   The wheel bearing device according to any one of claims 1 to 5, wherein a slight radial clearance is formed between the outer joint member and the knuckle to constitute a labyrinth seal.

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