JP2009150417A - Wheel bearing device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a wheel bearing device which can keep bearing performance for a long period of time by improving a sealing performance of seal. <P>SOLUTION: The wheel bearing device is characterized in that a backup seal 21 is arranged in an outer side of an inner side seal 9; this backup seal 21 consists of a core bar 22 including a cylindrical fitting section 22a press-fitted to an edge periphery of an outer member 10, a collar section 22b extended from this fitting section 22a to radial inner side, and a cylindrical section 22c extended from this collar section 22b to axial direction, and a seal member 23 which is connected with this core bar 22, and includes a pair of radial lips 23a, 23b extended in slant in axial direction; a slinger 19 roughly formed in L shape in cross section is externally fitted to a shoulder section 13; this slinger 19 includes a cylindrical fitting section 19a press-fitted to an outer diameter of the shoulder section 13; a vertical plate 19b extended from this fitting section 19a to radial inner side; and the radial lips 23a, 23b are slidably in contact with the fitting section 19a. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a wheel bearing device for rotatably supporting a wheel of an automobile or the like, and in particular, a wheel bearing equipped with a seal having a sufficient sealing property even in an environment where a large amount of foreign matter such as rainwater and muddy water exists. It relates to the device.

  Since the wheel bearing device that supports the wheel of the automobile rotatably with respect to the suspension device is in an environment where it is directly exposed to rainwater, muddy water, etc., it is strong so that this rainwater, muddy water, etc. does not enter the inside of the bearing. A seal having a sealing property is attached. In addition, in the fitting portion of this seal, in particular, in the metal fitting portion into which the core metal of the seal is press-fitted, rain water or muddy water may enter the fitting portion and the core metal may rust. If the metal core rusts, not only the airtightness of the seal is impaired, but also the sealing function is lowered and the durability of the bearing is affected. In recent years, this type of wheel bearing device used in such a harsh environment has been required to have a longer service life. Damage due to seal failure accounts for more than the bearing life. Accordingly, various wheel bearing devices have been proposed in which the sealability and durability of the seal are improved to improve the bearing life.

  The wheel bearing device shown in FIG. 4A shows an example of this. This is a wheel bearing device on the drive wheel side, and integrally has a vehicle body mounting flange 51b attached to the vehicle body (not shown) on the outer periphery, and double row outer rolling surfaces 51a and 51a are formed on the inner periphery. The outer member 51 and the wheel mounting flange 53 to which a wheel (not shown) is attached at one end are integrally formed, and one inward rolling facing the double row outer rolling surfaces 51a, 51a is provided on the outer periphery. A running surface 52a, a cylindrical small-diameter stepped portion 52b extending in the axial direction from the inner rolling surface 52a, a hub wheel 52 formed with serrations for torque transmission on the inner periphery, and press-fitted into the small-diameter stepped portion 52b And an inner ring 55 having the other inner rolling surface 55a formed on the outer periphery. A hub bolt 54 for mounting a wheel (not shown) is implanted at a circumferentially equidistant position of the wheel mounting flange 53 of the hub wheel 52.

  A double row of balls 56 is accommodated by a cage 57 between the double row outer raceway surfaces 51a and 51a and the inner raceway surfaces 52a and 55a opposite to each other. Seals 59 and 60 are respectively attached to the openings of the annular space formed between the inner member 58 formed of the hub ring 52 and the inner ring 55 and the outer member 51, and sealed inside the bearing. This prevents leakage of lubricating grease and intrusion of rainwater and muddy water into the bearing from the outside.

  Of these seals 59, 60, the seal 60 mounted between the outer member 51 and the inner ring 55 is internally fitted to the outer member 51 serving as a fixed raceway, as shown in FIG. An L-shaped cored bar 61, an annular seal plate 63 composed of a seal member 62 integrally vulcanized and bonded to the cored bar 61, and an inner ring 55 serving as a rotation-side raceway are externally fitted. Similarly, a slinger 64 having an L-shaped cross section is provided. The seal member 62 is made of an elastic member such as rubber, and includes three seal lips, that is, a side lip 62a, a grease lip 62b, and an intermediate lip 62c, and the end edge of the side lip 62a is the inner surface of the standing plate portion 64b of the slinger 64. The tip edges of the remaining grease lip 62b and intermediate lip 62c are in sliding contact with the cylindrical portion 64a of the slinger 64.

An encoder 65 mixed with magnetic powder is integrally vulcanized and bonded to the outer surface of the slinger 64. The encoder 65 is composed of a rubber magnet having magnetic poles N and S alternately formed in the circumferential direction, and constitutes a rotary encoder for detecting wheel rotation speed. The seal plate 63 and the tip of the standing plate portion 64b of the slinger 64 are opposed to each other through a slight radial clearance, and the labyrinth seal 66 is configured up to this clearance. Then, the rubber of the seal member 62 is wrapped around the exposed tip portion of the core bar 61 to improve the airtightness of the fitting portion of the seal plate 63 and to the exposed width surface, chamfered portion, and outer diameter surface of the inner ring 55. In addition, a rust prevention layer 67 made of a resin layer such as a metal plating layer or a water-soluble acrylic resin-based coating is formed to prevent rusting of the fitting part of the slinger 64, and a large amount of foreign matter such as rainwater and muddy water exists. Even under such circumstances, it is configured to exhibit sufficient airtightness and sealing performance (see, for example, Patent Document 1).
JP 2002-147478 A

  However, such a conventional seal 60 has a problem in that the number of steps for forming the antirust treatment layer 67 on the inner ring 55 is increased, and the manufacturing cost is increased due to the increased number of steps. In addition, when exposed to an environment where a large amount of foreign matter such as rainwater or muddy water is present, foreign matter such as muddy water enters from the labyrinth seal 66 and stays inside the seal. There was a risk that the sealing performance would deteriorate due to solidification.

  This invention is made | formed in view of such a situation, and aims at the improvement of the sealing performance of a seal | sticker, and it aims at providing the wheel bearing apparatus which can maintain bearing performance over a long period of time. .

  In order to achieve such an object, the invention according to claim 1 of the present invention has a vehicle body mounting flange integrally attached to the suspension on the outer periphery, and a double row outer rolling surface integrally on the inner periphery. A hub wheel having an outer member formed integrally with a wheel mounting flange for mounting a wheel at one end, and having a cylindrical small-diameter stepped portion extending in the axial direction on the outer periphery, and a small diameter of the hub wheel An inner member formed of at least one inner ring press-fitted into a stepped portion, and formed with a double-row inner rolling surface opposed to the double-row outer rolling surface on the outer periphery, and the inner member and the outer A seal attached to an opening portion of an annular space formed by a double row rolling element that is rotatably accommodated between both rolling surfaces of the member via a cage, and the outer member and the inner member. The outer joint member constituting the constant velocity universal joint is detachably connected to the hub wheel. In the above wheel bearing device, the shoulder portion of the outer joint member is in contact with the inner member, and a backup seal is provided on the outer side of the inner seal of the seal. And a seal lip that seals between the inner end of the outer member and the shoulder of the outer joint member.

  As described above, a wheel having a seal attached to an opening of an annular space formed by an outer member and an inner member, and an outer joint member constituting a constant velocity universal joint being detachably connected to a hub wheel. In the bearing device, the shoulder portion of the outer joint member is brought into contact with the inner member, and a backup seal is provided on the outer side of the inner seal among the seals. Since the seal lip that seals between the end of the side and the shoulder of the outer joint member is integrally provided, the seal on the inner side can be used even in an environment where a large amount of foreign matter such as rainwater or muddy water exists. It is not directly exposed to a harsh environment and can maintain a stable sealing property over a long period of time.

  According to a second aspect of the present invention, the backup seal includes a cylindrical fitting portion that is press-fitted and fixed to the outer periphery of the inner side end of the outer member, and a radially inner portion from the fitting portion. And a seal member having a radial lip that is joined to the core bar and extends in an inclined manner in the axial direction. A slinger having a substantially L-shaped cross section is fitted on the part, and a cylindrical fitting part into which the slinger is press-fitted into the outer diameter of the shoulder part, and a standing part extending radially inward from the fitting part. A plate portion, and the radial lip may be in sliding contact with the fitting portion.

  According to a third aspect of the present invention, the backup seal includes a cylindrical fitting portion that is press-fitted to the outer periphery of the inner side end portion of the outer member, and a radially inner portion from the fitting portion. And a metal core having a flange extending in the direction and a cylindrical portion extending in the axial direction from the flange, and a seal member having a radial lip bonded to the metal core and extending in an axial direction. A cylindrical portion in which a slinger is externally fitted to the inner ring, the slinger is press-fitted into the outer diameter of the inner ring, a standing plate portion extending radially outward from the cylindrical portion, and an umbrella extending in the axial direction from the standing plate portion And the radial lip may be in sliding contact with the umbrella portion.

  Further, as in the invention described in claim 4, if the seal member is joined from the flange portion of the core metal to the cylindrical portion and is in elastic contact with the end surface of the outer member, The airtightness of the fitting part with the outer member can be improved.

  Further, as in the invention described in claim 5, if a tongue piece is joined to the standing plate portion of the slinger, and the tongue piece is in elastic contact with the shoulder portion, foreign matters such as rain water and muddy water are in contact with the inner ring. Intrusion into the contact portion with the shoulder portion can be prevented.

  According to a sixth aspect of the present invention, the inner seal is a core metal press-fitted into the inner periphery of the end of the outer member, and a seal member joined to the core metal and having a side lip. The side lip may be in sliding contact with the standing plate portion of the slinger.

  In addition, if the slinger is formed by pressing from a steel plate having rust prevention ability as in the invention described in claim 7, rusting is prevented over a long period of time and durability is improved. Can do.

  A wheel bearing device according to the present invention has an outer member integrally formed with a vehicle body mounting flange for mounting to a suspension device on the outer periphery, and an outer member formed integrally with a double row outer rolling surface on the inner periphery, and one end A hub wheel integrally having a wheel mounting flange for mounting a wheel on the part and formed with a cylindrical small-diameter step portion extending in the axial direction on the outer periphery, and at least one press-fitted into the small-diameter step portion of the hub wheel An inner member formed of an inner ring and formed on the outer periphery with a double-row inner rolling surface facing the double-row outer rolling surface, and held between both rolling surfaces of the inner member and the outer member A double row rolling element housed so as to be able to roll through a container, and a seal attached to an opening of an annular space formed by the outer member and the inner member, and a constant velocity universal joint In a wheel bearing device in which an outer joint member to be configured is detachably connected to the hub wheel. A shoulder portion of the outer joint member is in contact with the inner member, and a backup seal is provided on the outer side of the inner seal of the seal, and the backup seal is connected to the inner member of the outer member. Since the seal lip that seals between the end of the side and the shoulder of the outer joint member is integrally formed, the seal on the inner side can be maintained even in an environment where a large amount of foreign matter such as rainwater or muddy water exists. Without being directly exposed to such a harsh environment, a stable sealing property can be maintained over a long period of time.

  An outer member integrally having a vehicle body mounting flange to be attached to the suspension device on the outer periphery, a double row outer rolling surface formed integrally on the inner periphery, and a wheel mounting flange for attaching a wheel to one end And a hub having an inner rolling surface facing one of the outer rolling surfaces of the double row and a cylindrical small-diameter step portion extending in the axial direction from the first rolling surface. An inner member formed of an inner ring that is press-fitted into a small-diameter step portion of the wheel and the hub wheel and has an inner rolling surface that is opposed to the other of the outer rolling surfaces of the double row on the outer periphery, and the inner member Attached to an opening of an annular space formed by a double row rolling element, which is movably accommodated via a cage between both rolling surfaces of the outer member, and the outer member and the inner member. And an outer joint member constituting a constant velocity universal joint is provided so that torque can be transmitted to the hub wheel. In the wheel bearing device connected so as to be separable in a state in which the shoulder portion is in contact with the inner ring, a backup seal is provided on the outer side of the inner side seal among the seals. A cylindrical fitting portion that is press-fitted and fixed to the outer periphery of the inner side end portion of the outer member, a flange portion that extends radially inward from the fitting portion, and a cylindrical portion that extends in an axial direction from the flange portion. And a seal member having a pair of radial lips joined to the core bar and extending in an axially inclined manner, and a slinger formed in a substantially L-shaped cross section on the shoulder is externally fitted. The slinger has a cylindrical fitting portion into which the outer diameter of the shoulder portion is press-fitted, and a standing plate portion extending radially inward from the fitting portion, and the radial lip is attached to the fitting portion. It is in sliding contact.

Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.
1 is a longitudinal sectional view showing an embodiment of a wheel bearing 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 view of a main part showing a modification of FIG. is there. In the following description, the side closer to the outer side of the vehicle when assembled to the vehicle is referred to as the outer side (left side in FIG. 1), and the side closer to the center is referred to as the inner side (right side in FIG. 1).

  This wheel bearing device is for a drive wheel, and includes an inner member 1, an outer member 10, and double-row rolling elements (balls) 6 and 6 accommodated between both members 1, 10, and the third generation. The structure is called. The inner member 1 includes a hub ring 2 and an inner ring 3 that is press-fitted into the hub ring 2 through a predetermined scissors. And the fixed type constant velocity universal joint 11 which transmits the motive power of a drive shaft (not shown) to the hub wheel 2 is connected so that isolation | separation is possible.

  The hub wheel 2 integrally has a wheel mounting flange 4 for attaching a wheel (not shown) to an end portion on the outer side, one (outer side) inner rolling surface 2a on the outer periphery, and this inner rolling. A cylindrical small-diameter step 2b extending in the axial direction from the surface 2a is formed, and a serration (or spline) 2c for torque transmission is formed on the inner periphery. Further, hub bolts 5 are implanted at equal circumferential positions of the wheel mounting flange 4. The inner ring 3 is formed with the other (inner side) inner rolling surface 3a on the outer periphery, and is press-fitted and fixed to the small-diameter step portion 2b of the hub ring 2 via a predetermined shimiro.

  The hub wheel 2 is made of medium and high carbon steel containing 0.40 to 0.80 wt% of carbon such as S53C, and includes an inner rolling surface 2a and an inner side of a wheel mounting flange 4 serving as a seal land portion of a seal 8 to be described later. The surface is hardened in the range of 58 to 64 HRC by induction hardening from the base 4a to the small diameter step 2b. On the other hand, the inner ring 3 and the rolling element 6 are made of high carbon chrome steel such as SUJ2, and are hardened in the range of 58 to 64 HRC up to the core portion by quenching.

  The outer member 10 integrally has a vehicle body mounting flange 10b to be attached to a knuckle (not shown) constituting a suspension device on the outer periphery, and the inner rolling surfaces 2a and 3a of the inner member 1 on the inner periphery. Opposing double-row outer rolling surfaces 10a and 10a are integrally formed. Between these rolling surfaces 10a, 2a and 10a, 3a, double row rolling elements 6, 6 are accommodated via a cage 7 so as to be freely rollable. This outer member 10 is made of medium and high carbon steel containing 0.40 to 0.80 wt% of carbon such as S53C, and at least double row outer raceway surfaces 10a and 10a are surfaced in the range of 58 to 64HRC by induction hardening. Has been cured. Further, seals 8 and 9 are attached to the opening of the annular space formed between the outer member 10 and the inner member 1, and leakage of the lubricating grease sealed inside the bearing to the outside and from the outside It prevents rainwater and dust from entering the bearing.

  In addition, although the double row angular contact ball bearing which used the ball for the rolling element 6 was illustrated here, this invention is not restricted to this, The double row tapered roller bearing which uses the tapered roller for the rolling element 6 may be sufficient. . In addition, the wheel bearing device according to the present invention is not limited to the illustrated third generation structure, and may be applied to a wheel bearing device of a second generation structure in which a pair of inner rings are press-fitted into a small diameter step portion of a hub wheel. Can do.

  The constant velocity universal joint 11 includes an outer joint member 12 that integrally includes a shoulder portion 13 that forms the bottom of a cup-shaped mouth portion and a shaft portion 14 that extends from the shoulder portion 13 in the axial direction. A serration (or spline) 14 a that is engaged with the serration 2 c of the hub wheel 2 is formed on the outer periphery of the shaft portion 14. Then, the shaft portion 14 is fitted into the hub wheel 2 via the serration 14 a until the shoulder portion 13 of the outer joint member 12 contacts the inner ring 3, and a fixing nut 15 is attached to the male screw 14 b formed at the end portion of the shaft portion 14. The hub wheel 2 and the outer joint member 12 are coupled so as to be separable in the axial direction in a state where is tightened with a predetermined tightening torque and a predetermined bearing preload is applied.

  The seal 8 on the outer side of the seals 8 and 9 is constituted by an integrated seal composed of a core metal 8a and a seal member 8b integrally bonded to the core metal 8a by vulcanization and having a side lip. Yes. The seal member 8b is in sliding contact with the base portion 4a on the inner side of the wheel mounting flange 4 formed in an arc shape in cross section.

  On the other hand, as shown in an enlarged view in FIG. 2, the inner seal 9 includes an annular seal plate 16 press-fitted into the inner periphery of the end of the outer member 10 and a slinger 19 described later. The seal plate 16 includes a metal core 17 and a seal member 18 integrally joined to the metal core 17 by vulcanization adhesion or the like.

  The metal core 17 is formed in a substantially L-shaped cross section by cold-working a cold rolled steel plate (JIS standard SPCC system or the like). Further, the seal member 18 is made of an elastic member such as synthetic rubber, and has a pair of side lips 18a and 18b formed with the tip portions inclined radially outward, and a slight radial clearance in the outer diameter of the inner ring 3. And a grease lip 18c opposed to each other. The pair of side lips 18 a and 18 b are in sliding contact with a slinger 19 that is fitted on the shoulder 13 of the outer joint member 12.

  The slinger 19 is formed of austenitic stainless steel plate (JIS standard SUS304 type, etc.) or rust-proof cold rolled steel plate (JIS standard SPCC type, etc.) into a substantially L-shaped cross section by pressing. And a cylindrical fitting portion 19a that is press-fitted into the shoulder portion 13 and a standing plate portion 19b that extends radially inward from the fitting portion 19a. The pair of side lips 18a and 18b are in sliding contact with the upright plate portion 19b. Further, a tongue piece 20 made of an elastic member such as synthetic rubber is integrally joined to the inner side surface of the standing plate portion 19b by vulcanization adhesion or the like. The tongue piece 20 elastically contacts the side surface of the shoulder portion 13, and foreign matters such as rain water and muddy water enter the bearing and the contact portion between the inner ring 3 and the shoulder portion 13 from the fitting portion between the slinger 19 and the shoulder portion 13. Is prevented.

  In the present embodiment, a backup seal 21 is further attached to the outer periphery of the end portion of the outer member 10. The backup seal 21 includes a metal core 22 and a seal member 23 that is integrally vulcanized and bonded to the metal core 22. The cored bar 22 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). A cylindrical fitting portion 22a that is press-fitted and fixed to the outer periphery of the inner end portion of the inner side 10, a flange portion 22b that extends radially inward from the fitting portion 22a, and a cylinder that extends in the axial direction from the flange portion 22b. Part 22c.

  On the other hand, the seal member 23 has a pair of radial lips 23a and 23b which are joined to the cylindrical portion 22c from the flange portion 22b of the core metal 22 and extend while inclining in the axial direction. The seal member 23 is in elastic contact with the end surface of the outer member 10 to improve the airtightness of the fitting portion. Further, the radial lips 23 a and 23 b are in sliding contact with the fitting portion 19 a of the slinger 19. Then, the chamfering start diameter of the slinger 19 is set to be smaller than the lip inner diameter so that the radial lips 23a and 23b are not reversed during assembly. With such a backup seal 21, even in an environment where a large amount of foreign matter such as rainwater or muddy water exists, the inner seal 9 is not directly exposed to such an environment, and a stable sealing property can be obtained over a long period of time. Can be held.

  Here, the radial lips 23a and 23b of the backup seal 21 are in sliding contact with the slinger 19 fitted on the shoulder 13, but not limited to this, the radial lip 23a and 23b is in direct contact with the outer diameter of the shoulder 13. Also good. In this case, it is preferable to set the chamfering start diameter of the shoulder 13 to be smaller than the lip inner diameter so that the radial lips 23a and 23b are not reversed during assembly.

  FIG. 3 is a modification of the above-described seal 9. In addition, the same code | symbol is attached | subjected to the components and site | parts which have the same components same site | part or the same function as embodiment mentioned above, and detailed description is abbreviate | omitted. In this embodiment, a backup seal 21 is press-fitted to the outer periphery of the end portion of the outer member 10, and a slinger 26 serving as a seal sliding contact surface of the backup seal 21 is press-fitted and fixed to the outer diameter of the inner ring 3.

  The inner-side seal 24 is attached to an opening of an annular space formed between the outer member 10 and the inner ring 3, and an annular seal plate 25 that is press-fitted into the inner periphery of the end of the outer member 10. It is constituted by a so-called pack seal, which is arranged to face the seal plate 25 and includes a slinger 26 press-fitted into the outer diameter of the inner ring 3.

  The seal plate 25 includes a metal core 27 and a seal member 28 that is integrally bonded to the metal core 27 by vulcanization adhesion or the like. The core metal 27 is formed in a substantially L-shaped cross section by cold-working a cold rolled steel plate (JIS standard SPCC system or the like). Further, the seal member 28 is made of an elastic member such as synthetic rubber, and integrally includes a side lip 28a formed with a tip portion inclined radially outward, a grease lip 28b, and an intermediate lip 28c.

  The slinger 26 is formed by pressing an austenitic stainless steel plate (JIS standard SUS304 type or the like) or a rust-proof cold rolled steel plate (JIS standard SPCC type or the like). A cylindrical portion 26a that is press-fitted into the diameter, a standing plate portion 26b that extends radially outward from the cylindrical portion 26a, and a cylindrical umbrella portion 26c that further extends in the axial direction from the standing plate portion 26b. .

  The side lip 28a of the seal member 28 is in sliding contact with the standing plate portion 26b of the slinger 26, and the grease lip 28b and the intermediate lip 28c are in sliding contact with the cylindrical portion 26a. Further, a tongue piece 29 made of an elastic member such as synthetic rubber is integrally joined to the inner side surface of the standing plate portion 26b by vulcanization adhesion or the like. The tongue piece 29 elastically contacts the side surface of the shoulder portion 13, and foreign matter such as rain water and muddy water enters the inside of the bearing and the contact portion between the inner ring 3 and the shoulder portion 13 from the fitting portion between the slinger 26 and the inner ring 3. Is preventing.

  Further, the pair of radial lips 23 a and 23 b of the backup seal 21 are in sliding contact with the umbrella portion 26 c of the slinger 26. As a result, as in the above-described embodiment, even in an environment where a large amount of foreign matter such as rainwater or muddy water is present, the inner-side seal 24 is not directly exposed to a harsh environment. A stable sealing property can be maintained.

  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 according to the present invention can be applied to a wheel bearing device having a second or third generation 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 of FIG. It is a principal part enlarged view which shows the modification of FIG. (A) is a longitudinal cross-sectional view which shows the conventional bearing device for wheels. (B) is the principal part enlarged view of (a).

Explanation of symbols

1 ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ Inner member 2 ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ Hub wheel 2a, 3a ・ ・ ・ ・ ・ ・ ・ ・···· Inner rolling surface 2b ··········· Small diameter step 2c, 14a ········· Serration 3 ······・ ・ ・ ・ ・ ・ ・ ・ ・ Inner ring 4 ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ Wheel mounting flange 4a ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ Base 5 ・ ・・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ Hub bolt 6 ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ Rolling element 7・ Retainer 8 ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ Outer side seals 8a, 17, 22, 27 ・ ・ ・ ・ ・ ・ Cores 8b, 18, 23, 28 ・ ・ ・ ・・ ・ Seal members 9, 24 ・ ・ ・ ・ ・ ・ ・ ・ Seal 10 on the inner side ・ ・ ・ ・ ・ ・・ ・ ・ ・ ・ ・ ・ ・ Outer member 10a ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ Outside rolling surface 10b ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ Car body mounting flange 11 ・・ ・ ・ ・ ・ ・ ・ ・ ・ Constant velocity universal joint 12 ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ Outer joint member 13 ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・... Shoulder 14 ... Shaft 14b ... Male thread 15 ...・ ・ ・ ・ ・ Fixing nuts 16 and 25 ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ Seal plates 18a, 18b and 28a ・ ・ ・ ・ ・ ・ Side lips 18c and 28b ・ ・ ・ ・ ・ ・Grease lip 19, 26 ... Slinger 19a, 22a ... Fitting part 19b, 26b ... Standing plate part 20, 29 ... tongue 21 ……………………………………………………………………………………………………………………………… The collar 22c, 26a… ...... Cylindrical part 23a, 23b ... Radial lip 26c ... Umbrella 51 ... Outside Member 51a ... Outer rolling surface 51b ... Car body mounting flange 52 ...・ ・ ・ ・ Hub wheel 52a, 55a ・ ・ ・ ・ ・ ・ Inner rolling surface 52b ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ Small diameter step 53 ・ ・ ・ ・ ・ ・ ・ ・.... Wheel mounting flange 54 .... Hub bolt 55 ..... Inner ring 56 ... ... ball 57 ... ·····························································.・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ Core 62 ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ Seal member 62a ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ Side lip 62b ············ Grease lip 62c ··········· Intermediate lip 63 ················ Plate 64 ... Slinger 64a ... Cylindrical part 64b ... Standing plate 65 ... Encoder 66 ... Labyrinth seal 67 ... .... Rust prevention treatment layer

Claims (7)

An outer member integrally having a vehicle body mounting flange to be attached to the suspension device on the outer periphery, and an outer rolling surface of a double row integrally formed on the inner periphery;
A hub wheel 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 at least one press-fitted into the small-diameter step portion of the hub ring An inner member formed of two inner rings, and formed on the outer periphery with a double-row inner rolling surface facing the double-row outer rolling surface;
A double row rolling element housed between the rolling surfaces of the inner member and the outer member so as to be freely rollable via a cage;
A seal attached to an opening of an annular space formed by the outer member and the inner member;
In the wheel bearing device in which the outer joint member constituting the constant velocity universal joint is detachably connected to the hub wheel,
The shoulder of the outer joint member is in contact with the inner member, and a backup seal is provided on the outer side of the inner seal of the seal, and the backup seal is connected to the inner side of the outer member. A wheel bearing device comprising a seal lip that seals between the end of the outer joint and the shoulder of the outer joint member.   A cylindrical fitting portion in which the backup seal is press-fitted and fixed to the outer periphery of the inner side end of the outer member, a flange extending radially inward from the fitting portion, and an axial direction from the flange A slinger formed in a substantially L-shaped cross section on the shoulder portion, and a seal member having a radial lip joined to the mandrel and extending in an axially inclined manner. A cylindrical fitting portion that is externally fitted and the slinger is press-fitted into the outer diameter of the shoulder portion; and a vertical plate portion that extends radially inward from the fitting portion, and the radial lip is fitted into the fitting portion. The wheel bearing device according to claim 1, which is in sliding contact with the joint.   The backup seal is a cylindrical fitting portion that is press-fitted and fixed to the outer periphery of the inner side end portion of the outer member, a flange portion that extends radially inward from the fitting portion, and a shaft extending from the flange portion. And a seal member having a radial lip bonded to the core bar and extending in an axial direction, and a slinger is externally fitted to the inner ring. A cylindrical portion press-fitted into the outer diameter of the inner ring; a standing plate portion extending radially outward from the cylindrical portion; and an umbrella portion extending in an axial direction from the standing plate portion, wherein the radial lip is disposed on the umbrella portion. The wheel bearing device according to claim 1, which is in sliding contact.   4. The wheel bearing device according to claim 2, wherein the seal member is joined from a flange portion of the cored bar to a cylindrical portion, and is in elastic contact with an end surface of the outer member.   The wheel bearing device according to claim 2, wherein a tongue piece is joined to the standing plate portion of the slinger, and the tongue piece is in elastic contact with the shoulder portion.   The inner side seal is composed of a core metal press-fitted into the inner periphery of the end of the outer member, and a seal member joined to the core metal and having a side lip, and the side lip is a standing plate portion of the slinger The wheel bearing device according to any one of claims 2 to 5, wherein the wheel bearing device is in sliding contact with the wheel.   The wheel bearing device according to any one of claims 2 to 6, wherein the slinger is formed by pressing from a steel plate having rust prevention ability.

Images