JP2009292303A - Bearing device for wheel - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a bearing device for a wheel allowing reduction of weight/size, improvement of sealing performance of a seal and maintenance of bearing performance over a long period. <P>SOLUTION: A backup seal 19 is attached to a base part 6b of a wheel mounting flange 6. The backup seal 19 is constituted of: core metal 20 having a cylindrical part 20a press-fitted into the base part 6b on an inner side of the wheel mounting flange 6; and a seal member 21 integrally joined to the core metal 20 by vulcanization adhesion and having a side lip 21b extended to be inclined outward in the radial direction and formed into a trumpet shape having a distal end part enlarged in diameter. The side lip 19 is brought into slidable contact with an end face 3c of an outward member 3 via a prescribed interference, and therefore, even if the wheel mounting flange 6 and an end part of the outward member 3 are disposed to be separated from each other, the backup seal 19 corresponding to the space therefore can be disposed, and sealing performance of the seal 8 is improved. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a wheel bearing device for rotatably supporting a wheel of an automobile or the like, and more particularly to a wheel bearing device with improved sealing performance.

  2. Description of the Related Art Conventionally, a wheel bearing device for supporting a wheel of an automobile or the like is such that a hub wheel for mounting a wheel is rotatably supported via a rolling bearing, and there are a drive wheel and a driven wheel. For structural reasons, an inner ring rotation method is generally used for driving wheels, and an inner ring rotation method and an outer ring rotation method are generally used for driven wheels. As the wheel bearing device, a double-row angular ball bearing having a desired bearing rigidity, exhibiting durability against misalignment, and having a small rotational torque from the viewpoint of improving fuel efficiency is often used. On the other hand, double row tapered roller bearings are used in vehicles such as off-road cars and trucks that have a heavy vehicle body weight.

  Since these wheel bearing devices are arranged at sites where muddy water or the like is likely to be applied, a seal device is mounted, and the space between the outer member and the inner member is sealed. Generally, in a sealing device, a sealing member having a sealing lip is attached to an outer member serving as a stationary member, and the sealing lip is slidably contacted with an outer peripheral surface of the inner member. In particular, in a vehicle that is driven in a poor environment such as an off-road car or a pickup truck, various means for further improving the sealing performance are taken.

  There is known a wheel bearing device with improved sealing performance. As shown in FIG. 14A, the wheel bearing device includes a hub wheel 51 and a wheel bearing 52. The wheel bearing 52 includes an outer member 53 and double-row tapered rollers 54 and 54. And a pair of inner rings 55 and 55 fitted inside.

  The hub wheel 51 integrally has a wheel mounting flange 56 for mounting a wheel (not shown) at one end portion, and a small-diameter step portion 51a extending in the axial direction from the wheel mounting flange 56 is formed, and torque is formed on the inner periphery. A serration (or spline) 51b for transmission is formed. Hub bolts 56a are planted on the wheel mounting flange 56 at equal intervals in the circumferential direction.

  The wheel bearing 52 is press-fitted into the small-diameter step portion 51a of the hub wheel 51 via a predetermined shimiro, and the hub wheel is formed by a caulking portion 51c formed by plastically deforming an end portion of the small-diameter step portion 51a radially outward. The shaft 51 is fixed in the axial direction.

  The outer member 53 of the wheel bearing 52 is integrally provided with a vehicle body mounting flange 53b to be attached to a knuckle (not shown) on the outer periphery, and the outer side of the tapered double row opened outward on the inner periphery. The rolling surfaces 53a and 53a are integrally formed.

  On the other hand, on the outer periphery of the inner ring 55, the tapered inner rolling surface 55a facing the double row outer rolling surfaces 53a, 53a and the tapered roller 54 are guided to the larger diameter side of the inner rolling surface 55a. A large collar 55b and a small collar 55c for preventing the tapered roller 54 from dropping off are formed on the small diameter side. The double-row tapered rollers 54 and 54 are accommodated between the rolling surfaces of the outer member 53 and the pair of inner rings 55 and 55, and are rotatably held by the cages 57 and 57. In addition, seals 58 and 58 are attached to an opening of an annular space formed between the outer member 53 and the inner ring 55. These seals 58 and 58 prevent the grease sealed inside the bearing from leaking to the outside and preventing rainwater and dust from entering the bearing from the outside.

  Furthermore, an outer seal member 59 that closes the space between the outer member 53 and the wheel mounting flange 56 is attached to the outer periphery of the end portion of the outer member 53. The outer seal member 59 is provided integrally with a main body cylinder portion 61 having a fixed base portion 60 fitted into one end portion of the outer peripheral surface and a peripheral edge of a distal end portion 61a of the main body cylinder portion 61 as shown in FIG. And a seal lip 62 made of an elastic body that is elastically pressed against one side surface of the wheel mounting flange 56. The main body cylinder portion 61 is formed in a tapered cylinder shape that is gradually reduced in diameter from the fixed base portion 60 toward the distal end portion 61a.

According to this configuration, when the vehicle travels, the muddy water splashed up to the upper part of the outer peripheral surface of the main body cylinder portion 61 smoothly flows downward along the outer peripheral inclined surface of the main body cylinder portion 61 to prevent unexpected intrusion of muddy water. be able to. As a result, the inner seal 58 can be protected from muddy water, and the durability of the wheel bearing 52 can be improved.
JP 2007-270960 A

  A problem remains when this type of outer seal member is applied to a wheel bearing device as shown in FIG. That is, this wheel bearing device is composed of a hub wheel 63 and a wheel bearing 64. The wheel bearing 64 is a pair of inner members fitted through outer members 65 and double-row tapered rollers 66, 66. Inner rings 67 and 67 are provided.

  The hub wheel 63 integrally has a wheel mounting flange 68 at one end portion, and a small-diameter step portion 63a extending in the axial direction from the wheel mounting flange 68 is formed. The wheel bearing 64 is press-fitted into the small-diameter step portion 63a of the hub wheel 63 via a predetermined shimiro, and the hub wheel is formed by a caulking portion 63b formed by plastically deforming an end portion of the small-diameter step portion 63a radially outward. It is fixed in the axial direction with respect to 63.

  The outer member 65 of the wheel bearing 64 integrally has a vehicle body mounting flange on the outer periphery, and is formed with tapered double-row outer rolling surfaces 65a and 65a that are outwardly opened on the inner periphery. Yes. On the other hand, on the outer periphery of the inner ring 67, a tapered inner rolling surface 67a facing the double row outer rolling surfaces 65a, 65a is formed. Double row tapered rollers 66, 66 are accommodated between the rolling surfaces of the outer member 65 and the pair of inner rings 67, 67, and are held by the retainers 69, 69 so as to be freely rollable. Further, seals 70 and 70 are attached to the opening portion of the annular space formed between the outer member 65 and the inner ring 67, and leakage of grease sealed inside the bearing to the outside, as well as rainwater and dust from the outside. Etc. are prevented from entering the inside of the bearing.

  The wheel bearing device is incorporated in a large vehicle such as a truck, and the wheel mounting flange 68 and the end portion of the outer member 65 are disposed apart from each other. However, in the wheel bearing device having such a specification, it is necessary to provide extra space on the base portion 68 a of the wheel mounting flange 68 in order to secure the sliding surface of the outer seal member 71. This is not preferable because not only the weight is increased and the fuel consumption of the vehicle is deteriorated, but also the forging formability is deteriorated and the cost is increased.

  The present invention has been made in view of such circumstances, and is intended to reduce the weight and size, improve the sealing performance of the seal, and maintain the bearing performance over a long period of time. The purpose is to provide.

  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 formed outer member and a hub wheel integrally having a wheel mounting flange for mounting a wheel at one end and a small-diameter stepped portion formed on the outer periphery, and an inner ring or a constant speed fitted to the hub ring An inner member comprising an outer joint member of a universal joint and having a double-row inner rolling surface facing the double-row outer rolling surface on the outer periphery, and both the inner member and the outer member. A double row rolling element accommodated between the running surfaces via a cage, and a seal attached to an opening of an annular space formed by the outer member and the inner member. In the wheel bearing device, a backup seat is provided at the inner base of the wheel mounting flange. The back-up seal is integrally joined to the metal core by vulcanization adhesion with a cylindrical part press-fitted into the base part on the inner side of the wheel mounting flange, and is inclined radially outward. And a seal member having a side lip formed in a trumpet shape whose tip portion expands and the back-up seal seals between the wheel mounting flange and the end portion of the outer member. Yes.

  Thus, in the wheel bearing device provided with the seal attached to the opening of the annular space formed by the outer member and the inner member, the backup seal is attached to the inner base portion of the wheel mounting flange. The back-up seal is integrally joined to the metal core having a cylindrical portion press-fitted into the base portion on the inner side of the wheel mounting flange, and is joined to the metal core by vulcanization adhesion. A seal member having a side lip formed in a trumpet shape that expands in diameter, and the backup seal seals between the wheel mounting flange and the end of the outer member. Even in the structure in which the end portion of the outer member is disposed apart from the end member, it is not necessary to form the base portion of the wheel mounting flange thick in order to secure the sliding contact surface as in the conventional case. Therefore, it is possible to provide a wheel bearing device capable of reducing the weight and size of the hub wheel, improving the sealing performance of the seal, and maintaining the bearing performance over a long period of time.

  Further, as in the invention described in claim 2, if an annular rib projects from the end of the cylindrical portion of the core bar, the rib increases the rigidity of the core bar and improves the proof stress. The stable contact of the side lip can be maintained.

  Further, as in the invention described in claim 3, if an annular protrusion is formed at the center of the cylindrical portion of the core metal, and the protrusion is engaged with an annular groove formed in the base portion. , The rigidity of the core bar is increased, and the pull-out resistance is further improved.

  Further, as in the invention described in claim 4, an annular bent piece extending radially inward is formed at the end of the cylindrical portion of the core metal, and the bent piece is formed in the base portion. If it engages with the groove, the rigidity of the metal core increases, and the pull-out resistance is further improved.

  Further, as in the invention according to claim 5, if a tapered portion that is expanded or contracted radially outward from the cylindrical portion of the core metal is formed, the wheel mounting flange and the end of the outer member are formed. Even if the part is arranged at a considerable distance, a backup seal corresponding to the space can be provided, the design freedom is widened, and the muddy water is downward along the taper part of the cored bar. It can flow smoothly and prevent the seal attached to the bearing from being directly exposed to muddy water or the like.

  Preferably, as in the invention described in claim 6, if a drain hole is formed in the tapered portion, the muddy water that has passed through the backup seal is easily drained, and the muddy water is solidified when the vehicle is stopped. Can prevent adverse effects.

  According to a seventh aspect of the present invention, the metal core has a flange that extends radially outward from the cylindrical portion, and a tip that extends in the axial direction from the flange, and the tip However, if the labyrinth seal is configured to face the end face of the outer member through a slight axial clearance, muddy water or the like can be reliably prevented from entering the seal, and the cored bar. The side lip can be protected by the cylindrical tip, and the sealing performance can be ensured over a long period of time.

  Further, as in the invention described in claim 8, the side lip may be in sliding contact with the end face of the outer member via a predetermined shimiro.

  Preferably, as in the invention according to claim 9, if the end surface of the outer member is subjected to hardening treatment by quenching, wear is suppressed and sealing performance is ensured over a long period of time. Can do.

  Further, as in the invention described in claim 10, a seal ring formed by press working from a steel plate having rust prevention ability is attached to an end portion of the outer member, and the seal ring is connected to the outer member. A cylindrical fitting portion that is fitted to the outer periphery of the end portion of the member, and a flange portion that extends radially inward from the fitting portion and closely contacts the end surface of the outer member. The side lip may be slidably contacted via a predetermined shimoshiro.

  Further, as in the invention described in claim 11, the outer seal of the seals is constituted by a pack seal comprising an annular seal plate and a slinger disposed so as to face each other with a substantially L-shaped cross section. The core plate is fitted to the inner periphery of the end portion of the outer member, and has a cylindrical fitting portion formed by pressing from a steel plate having rust prevention ability; A flange member that is integrally joined by vulcanization bonding and that extends radially outward from the fitting portion and is in close contact with an end surface of the outer member. The side lip is formed on the flange portion. May be in sliding contact with each other via a predetermined shimoshiro.

  Preferably, as in the invention according to claim 12, if the sealing member is joined to the fitting portion of the core metal and joined, the airtightness of the joint surface between the core metal and the outer member is improved. It is possible to prevent muddy water and rainwater from entering.

  If the backup seal has a plurality of side lips as in the invention described in claim 13, the sealability of the backup seal is further improved, and muddy water or the like directly enters the seal attached to the bearing. Can be surely prevented.

  Further, as in the invention described in claim 14, if the core metal of the backup seal is formed by pressing from a steel plate having rust prevention ability, rusting of the core metal is prevented over a long period of time. 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 ring integrally having a wheel mounting flange for mounting a wheel on the part, and a outer ring member of an inner ring or a constant velocity universal joint fitted to the hub ring, and a small-diameter stepped portion formed on the outer periphery, An inner member in which a double row inner rolling surface facing the outer rolling surface of the double row is formed on the outer periphery, and a cage is provided between both rolling surfaces of the inner member and the outer member. A wheel bearing device comprising: a double row of rolling elements housed so as to be freely rollable; and a seal attached to an opening of an annular space formed by the outer member and the inner member. A backup seal is attached to the inner base of the flange. A seal has a cylindrical part press-fitted into the base part on the inner side of the wheel mounting flange, and is integrally joined to the metal core by vulcanization adhesion, and extends at an incline in the radial direction, and the tip part is And a sealing member having a side lip formed in a trumpet shape that expands in diameter, and the backup seal seals between the wheel mounting flange and the end of the outer member. Even in the structure in which the outer member and the end of the outer member are spaced apart from each other, it is not necessary to form the base portion of the wheel mounting flange thick in order to secure the sliding contact surface as in the prior art. Therefore, it is possible to provide a wheel bearing device capable of reducing the weight and size of the hub wheel, improving the sealing performance of the seal, and maintaining the bearing performance over a long period of time.

  A hub wheel having a wheel mounting flange for mounting a wheel at one end and a small diameter step portion extending in the axial direction from the wheel mounting flange is formed on the outer periphery, and the hub wheel is press-fitted into the small diameter step portion of the hub wheel. An outer member comprising a wheel bearing, the wheel bearing integrally having a vehicle body mounting flange to be attached to the suspension device on the outer periphery, and a double row outer rolling surface formed integrally on the inner periphery A pair of inner rings each having an inner rolling surface facing the outer rolling surface of the double row on the outer periphery, and a double row rolling accommodated between the rolling surfaces via a cage. A caulking portion that includes a moving body and a seal attached to an opening portion of an annular space formed by the outer member and the inner ring, and is formed by plastically deforming an end portion of the small-diameter step portion radially outward. The wheel bearing is applied to the hub wheel with a predetermined bearing preload applied by In the wheel bearing device fixed in the axial direction, a backup seal is attached to the inner side base portion of the wheel mounting flange, and the backup seal has a cylindrical portion that is press-fitted into the inner side base portion of the wheel mounting flange. A core metal and a seal member having a side lip formed in a trumpet shape that is integrally bonded to the core metal by vulcanization adhesion, extends in a radially outward direction, and expands the tip portion, The side lip is slidably contacted with the end surface of the outer member through a predetermined shimiro.

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 a main part showing a modification of the backup seal of FIG. Enlarged views and Figs. 4 to 13 are enlarged views of main parts showing other modified examples of the backup seal. 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 driven wheel referred to as a second generation, and includes a hub wheel 1 and a wheel bearing 2, and the wheel bearing 2 includes an outer member 3 and a double row rolling element ( A pair of inner rings 5 and 5 that are fitted through tapered rollers 4 and 4.

  The hub wheel 1 integrally has a wheel mounting flange 6 for mounting a wheel (not shown) at one end portion, and a small-diameter step portion 1b extending from the wheel mounting flange 6 in the axial direction via a shoulder portion 1a is formed. Has been. Hub bolts 6a are planted on the wheel mounting flange 6 at equal intervals in the circumferential direction. The wheel bearing 2 is press-fitted into the small-diameter step portion 1b of the hub wheel 1 through a predetermined shimiro, and a predetermined portion is formed by a caulking portion 1c formed by plastically deforming an end portion of the small-diameter step portion 1b radially outward. It is fixed in the axial direction with respect to the hub wheel 1 with the bearing preload applied.

  The hub wheel 1 is made of medium and high carbon steel containing 0.40 to 0.80 wt% of carbon such as S53C, and has a small diameter step from a base portion 6b formed in an arc shape on the inner side of the wheel mounting flange 6 via a shoulder portion 1a. The surface hardness is hardened in the range of 50 to 64 HRC by induction hardening over the part 1b. The caulking portion 1c is kept in the surface hardness after forging. Thereby, it has sufficient mechanical strength with respect to the rotational bending load applied to the wheel mounting flange 6, and the fretting resistance of the small diameter step portion 1b which becomes the fitting portion of the inner rings 5, 5 is improved. Caulking can be easily performed, and generation of microcracks associated with the caulking can be prevented.

  The outer member 3 of the wheel bearing 2 is integrally formed with a vehicle body mounting flange (not shown) for attaching to a knuckle (not shown) on the outer periphery, and has a tapered shape that opens outward on the inner periphery. Double row outer rolling surfaces 3a, 3a are integrally formed. This outer member 3 is formed of medium and high carbon steel containing 0.40 to 0.80 wt% of carbon such as S53C, and the double row outer rolling surfaces 3a and 3a have a surface hardness of 58 to 64HRC by induction hardening. Has been cured.

  On the other hand, on the outer periphery of the inner ring 5, the tapered inner rolling surface 5a facing the double row outer rolling surfaces 3a, 3a and the rolling element 4 are guided to the larger diameter side of the inner rolling surface 5a. A large collar 5b and a small collar 5c for preventing the rolling element 4 from falling off are formed on the small diameter side. The inner ring 5 and the rolling element 4 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 part by quenching. And the double-row rolling elements 4 and 4 are accommodated between both rolling surfaces of the outer member 3 and a pair of inner ring | wheels 5 and 5, and are hold | maintained by the holder | retainers 7 and 7 so that rolling is possible. The wheel bearing 2 is a so-called back-to-back type double row in which the large end surface of the inner ring 5 on the outer side is in contact with the shoulder 1a of the hub ring 1 and the small ribs 5c of the inner ring 5 abut each other in a butted state. Consists of tapered roller bearings.

  Further, seals 8 and 8 are attached to an opening of an annular space formed between the outer member 3 and the inner ring 5. These seals 8 and 8 prevent the grease sealed inside the bearing from leaking to the outside and preventing rainwater, dust, etc. from entering the bearing from the outside.

  In the present embodiment, a sensor mounting hole 9 is formed between the outer rolling surfaces 3 a and 3 a of the double row of the outer member 3 so as to penetrate in the radial direction of the outer member 3. A sensor 11 is inserted into the sensor mounting hole 9 via a seal ring 10 made of an O-ring or the like. A harness 12 is connected to the sensor 11.

  In addition, a magnetic encoder 13 is disposed in the sensor 11 via a predetermined radial clearance (air gap). A metal ring 14 is fitted and fixed to the outer periphery of the inner ring 5 on the outer side, and the magnetic encoder 13 is provided on the metal ring 14. In this magnetic encoder 13, magnetic material powder such as ferrite is mixed in an elastomer such as rubber, and is integrally joined to the outer periphery of the metal ring 14 by vulcanization and the magnetic poles N and S are alternately magnetized in the circumferential direction. The rotary encoder is configured.

  As shown in an enlarged view in FIG. 2, the seal 8 forms a pack seal including an annular seal plate 15 and a slinger 16 which are substantially L-shaped in cross section and arranged to face each other. The seal plate 15 includes a metal core 17 that is press-fitted into the inner periphery of the end of the outer member 3, and a seal member 18 that is integrally vulcanized and bonded to the metal core 17. The metal core 17 has a substantially L-shaped cross section by pressing from an austenitic stainless steel plate (JIS standard SUS304, etc.) or a rust-proof cold rolled steel plate (JIS standard SPCC, etc.). And a cylindrical fitting portion 17a fitted to the inner periphery of the end portion of the outer member 3, and an inner diameter portion 17b extending radially inward from the fitting portion 17a. The seal member 18 is joined to the inner diameter portion 17b of the core metal 17, and has a side lip 18a, and a grease lip 18b and an intermediate lip 18c formed in a forked shape on the inner diameter side of the side lip 18a.

  On the other hand, the slinger 16 has a substantially L-shaped cross section when it is pressed from an austenitic stainless steel plate (JIS standard SUS304 type or the like) or a rust-proof cold rolled steel plate (JIS standard SPCC type or the like). The cylindrical portion 16a is press-fitted into the outer diameter of the inner ring 5 and the upright plate portion 16b extends radially outward from the cylindrical portion 16a. The side lip 18a of the seal member 18 is in sliding contact with the upright plate portion 16b, and the intermediate lip 18c is in sliding contact with the cylindrical portion 16a. The grease lip 18b is opposed to the cylindrical portion 16a via a slight radial clearance to form a labyrinth seal.

  Furthermore, in this embodiment, a backup seal 19 is attached to the outer periphery of the outer end portion of the outer member 3. The backup seal 19 includes a metal core 20 and a seal member 21 that is integrally vulcanized and bonded to the metal core 20. The core 20 is made of an austenitic stainless steel plate (such as JIS standard SUS304) that can prevent rusting over a long period of time or a rust-proof cold rolled steel plate (such as JIS standard SPCC). A cylindrical portion 20a that is formed into a substantially L-shaped section by press working and is fitted to the base portion 6b on the inner side of the wheel mounting flange 6, and a flange portion 20b that extends radially inward from the cylindrical portion 20a. is doing.

  On the other hand, the seal member 21 is made of synthetic rubber such as nitrile rubber, and has a fixed base portion 21a fixed to the flange portion 20b of the cored bar 20 and extends from the fixed base portion 21a so as to incline radially outward, and the distal end portion expands. It consists of a side lip 21b formed in a trumpet shape. The side lip 21b is slidably contacted with the outer end surface 3c of the outer member 3 through a predetermined shimiro to prevent muddy water or the like from directly entering the seal 8 and improve the sealing performance. . That is, even if the backup seal 19 is exposed to muddy water or the like, the outer peripheral inclined surface of the side lip 21b acts as a so-called soot, so that the muddy water smoothly flows downward along the outer peripheral surface, and the seal 8 directly enters the muddy water or the like. Exposure can be prevented. Here, if the end surface 3c of the outer member 3 serving as the slidable contact surface of the side lip 21b is hardened on the surface by induction hardening, the wear is suppressed and the sealing performance is ensured over a long period of time. be able to.

  In the present embodiment, since the backup seal 19 is mounted on the base 6b of the hub wheel 1 and the side lip 21b of the backup seal 19 is in sliding contact with the end surface 3c of the outer member 3, in this way, the wheel mounting flange 6 Even in a structure in which the outer member 3 and the end of the outer member 3 are spaced apart from each other, it is necessary to form the base portion 6b of the wheel mounting flange 6 thick in order to secure a sliding contact surface, as in the prior art. Absent. Therefore, it is possible to provide a wheel bearing device capable of reducing the weight and size of the hub wheel 1, improving the sealing performance of the seal 8, and maintaining the bearing performance over a long period of time.

  In addition, although the 2nd generation structure by the side of a driven wheel was illustrated here, the wheel bearing apparatus which concerns on this invention is not restricted to this, A 3rd or 4th generation structure may be sufficient. Moreover, the drive wheel side may be sufficient. Furthermore, in this embodiment, the double row tapered roller bearing using the tapered roller as the rolling element 4 is illustrated, but the present invention is not limited to this, and a double row angular ball bearing using a ball as the rolling element 4 may be used.

  FIG. 3 shows a modification of the backup seal 19 shown in FIG. The backup seal 22 includes a metal core 23 and a seal member 24 that is integrally vulcanized and bonded to the metal core 23. The metal core 23 is formed into a substantially L-shaped cross section by pressing 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). It has a cylindrical portion 20a that is formed and fitted to the base portion 6b on the inner side of the wheel mounting flange 6, and a flange portion 23a that extends radially outward from the cylindrical portion 20a.

  The seal member 24 is made of a synthetic rubber such as nitrile rubber, and has a fixed base portion 24a fixed to the flange portion 23a of the cored bar 23, and extends from the fixed base portion 24a so as to incline radially outward, and the distal end portion expands in diameter. The side lip 24b is formed in a trumpet shape. The side lip 24b is brought into sliding contact with the outer end surface 3c of the outer member 3 through a predetermined shimiro to prevent muddy water or the like from directly entering the seal 8 and improve the sealing performance. .

  The following is a variation of the backup seal. FIG. 4 basically differs from the backup seal 19 shown in FIG. 2 only in the sliding contact portion, and other parts and portions having the same functions or the same functions as those in the above-described embodiment are denoted by the same reference numerals. Therefore, detailed description is omitted. The seal 25 attached to the bearing constitutes a pack seal composed of an annular seal plate 26 and a slinger 16 which are arranged to face each other with a substantially L-shaped cross section.

  The seal plate 26 includes a metal core 27 that is press-fitted into the inner periphery of the end of the outer member 3, and a seal member 18 that is integrally vulcanized and bonded to the metal core 27. The metal core 27 is formed into a crank shape by pressing from an austenitic stainless steel plate (JIS standard SUS304, etc.) or a rust-proof cold rolled steel plate (JIS standard SPCC, etc.). A cylindrical fitting portion 17a fitted to the inner periphery of the end of the outer member 3, an inner diameter portion 17b extending radially inward from the fitting portion 17a, and a radially outward direction from the fitting portion 17a. And a flange portion 27 a that is in close contact with the end surface 3 c of the outer member 3.

  The side lip 21b of the backup seal 19 is slidably contacted with the flange portion 27a of the metal core 27 constituting the seal 25 via a predetermined shimoshiro to prevent muddy water or the like from directly entering the seal 25. Here, the seal member 18 of the seal 25 is wrapped around and joined to the fitting portion 17a of the core metal 27. Thereby, the airtightness of the joint surface of the metal core 27 and the outer member 3 can be enhanced, and muddy water, rainwater, and the like can be prevented from entering.

  FIG. 5 basically differs from the backup seal 19 shown in FIG. 4 only in a part of the configuration of the seal member, and is the same for other parts and parts having the same function or the same function as those of the above-described embodiment. Reference numerals are assigned and detailed description is omitted. The backup seal 28 includes a metal core 20 and a seal member 29 that is integrally vulcanized and bonded to the metal core 20.

  The seal member 29 is made of synthetic rubber such as nitrile rubber, and has a fixed base portion 21a fixed to the flange portion 20b of the core metal 20 and extends radially outward from the fixed base portion 21a so that the tip portion has a larger diameter. It consists of a pair of side lips 21b, 29a formed in a trumpet shape. These side lips 21 b and 29 a are slidably contacted with a flange portion 27 a of a core metal 27 constituting the seal 25 via a predetermined shimiro. Thereby, the sealing performance of the backup seal 28 is further improved, and muddy water or the like can be reliably prevented from entering the seal 25 directly.

  FIG. 6 basically differs from the backup seal 19 shown in FIG. 2 only in the sliding contact portion, and the same reference numerals are given to other parts and parts having the same functions as those of the above-described embodiment. Therefore, detailed description is omitted. In this embodiment, a seal ring 30 is attached to the end of the outer member 3.

  The seal ring 30 has a substantially L-shaped cross section 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 30a that is fitted to the outer periphery of the end portion of the outer member 3, and a flange that extends radially inward from the fitting portion 30a and is in close contact with the end surface 3c of the outer member 3. Part 30b. The side lip 21b of the backup seal 19 is slidably contacted with the flange portion 30b of the seal ring 30 via a predetermined shimiro to prevent muddy water or the like from directly entering the seal 8.

  FIG. 7 differs from the backup seal 19 shown in FIG. 2 basically only in a part of the configuration of the cored bar 20, and other parts and parts having the same function or the same function as those of the above-described embodiment are shown in FIG. The same reference numerals are assigned and detailed description is omitted.

  The backup seal 31 includes a metal core 32 and a seal member 21 that is integrally vulcanized and bonded to the metal core 32. The metal core 32 is formed into a substantially L-shaped cross section by pressing 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 portion 20a that is formed and fitted to the base portion 6b on the inner side of the wheel mounting flange 6 and a flange portion 20b that extends radially inward from the cylindrical portion 20a, and is annular at the end of the cylindrical portion 20a The rib 32a is projected. The rib 32a increases the rigidity of the cored bar 32 to improve the pull-out resistance and maintain stable contact of the side lip 21b.

  FIG. 8 is different from the backup seal 19 shown in FIG. 2 basically in the configuration of the cored bar 20 except for the same parts or parts having the same functions as those of the above-described embodiment. The same reference numerals are assigned and detailed description is omitted.

  The backup seal 33 includes a cored bar 34 and a seal member 21 that is integrally vulcanized and bonded to the cored bar 34. The metal core 34 is formed into a substantially L-shaped cross section by pressing 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 portion 34a that is formed and fitted to the base portion 6b on the inner side of the wheel mounting flange 6 and a flange portion 20b that extends radially inward from the cylindrical portion 34a, and is annular at the center of the cylindrical portion 34a. The ridge 35 is formed. And this protrusion 35 is engaged with the annular groove 36 formed in the base 6b. By adopting such a configuration, the rigidity of the cored bar 34 is increased, and the pull-out resistance is further improved.

  FIG. 9 basically differs from the backup seal 22 shown in FIG. 3 only in a part of the configuration of the core metal 23, and other parts and parts having the same function or the same function as those of the above-described embodiment The same reference numerals are assigned and detailed description is omitted.

  The backup seal 37 includes a metal core 38 and a seal member 24 that is integrally vulcanized and bonded to the metal core 38. The metal core 38 is formed into a substantially L-shaped cross section by pressing 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 portion 20a that is formed and fitted to the base portion 6b on the inner side of the wheel mounting flange 6 and a flange portion 23a that extends radially inward from the cylindrical portion 20a and has a diameter at the end of the cylindrical portion 20a. An annular bent piece 39 extending inward in the direction is formed. The bent piece 39 is engaged with an annular groove 40 formed in the base portion 6b. By adopting such a configuration, the rigidity of the cored bar 38 is increased, and the pull-out resistance is further improved.

  FIG. 10 basically differs from the backup seal 22 shown in FIG. 3 only in the configuration of the cored bar 23, and other parts and parts having the same functions or similar functions as those of the above-described embodiment are denoted by the same reference numerals. The detailed description is omitted.

  The backup seal 41 includes a metal core 42 and a seal member 24 that is integrally vulcanized and bonded to the metal core 42. The core metal 42 is formed into a cylindrical shape 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 portion 20a fitted to the inner side base portion 6b of the wheel mounting flange 6, a tapered portion 42a having a diameter increased radially outward from the cylindrical portion 20a, and a tip portion extending in the axial direction from the tapered portion 42a 42b. By adopting such a configuration, even if the wheel mounting flange 6 and the end of the outer member 3 are arranged at a considerable distance, the backup seal 41 corresponding to the space can be provided. Further, the degree of freedom of design is widened, and the muddy water smoothly flows downward along the tapered portion 42a of the core metal 42, thereby preventing the seal 8 from being directly exposed to the muddy water.

  FIG. 11 basically differs from the backup seal 41 shown in FIG. 10 only in the configuration of the cored bar 42. Other parts and parts having the same function or the same function as those of the above-described embodiment are shown in FIG. The same reference numerals are assigned and detailed description is omitted.

  The backup seal 43 includes a metal core 44 and a seal member 24 that is integrally vulcanized and bonded to the metal core 44. The core metal 44 is formed into a cylindrical shape 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 portion 20a fitted to the inner side base portion 6b of the wheel mounting flange 6, a tapered portion 44a having a diameter reduced radially outward from the cylindrical portion 20a, and a tip portion extending in the axial direction from the tapered portion 44a 42b. An annular rib 32a protrudes from the end of the cylindrical portion 20a. The ribs 32a increase the rigidity of the core metal 44, improve the pulling-out resistance, and maintain a stable contact with the side lip 24b.

  FIG. 12 differs from the backup seal 43 shown in FIG. 11 basically in a part of the configuration of the cored bar 44, and other parts and parts having the same function or the same function as those of the above-described embodiment are included. The same reference numerals are assigned and detailed description is omitted.

  The backup seal 45 includes a metal core 46 and a seal member 24 that is integrally vulcanized and bonded to the metal core 46. The core metal 46 is formed into a cylindrical shape 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 portion 20a fitted to the inner side base portion 6b of the wheel mounting flange 6, a tapered portion 46a having a diameter reduced radially outward from the cylindrical portion 20a, and a tip portion extending in the axial direction from the tapered portion 46a 42b. An annular rib 32a protrudes from the end of the cylindrical portion 20a, and a drain hole 47 is formed in the tapered portion 46a. By adopting such a configuration, the rigidity of the cored bar 46 is increased and the proof stress is improved, and muddy water or the like that has passed through the backup seal 45 is easily drained. Therefore, it is possible to prevent the muddy water and the like from being solidified when the vehicle is stopped.

  FIG. 13 differs from the backup seal 22 shown in FIG. 3 basically in a part of the configuration of the cored bar 44, and other parts and parts having the same function or the same function as those of the above-described embodiment are shown. The same reference numerals are assigned and detailed description is omitted.

  The backup seal 48 includes a metal core 49 and a seal member 50 that is integrally vulcanized and bonded to the metal core 49. The metal core 49 is formed into a crank shape by pressing from an austenitic stainless steel plate (JIS standard SUS304 type, etc.) or a rust-proof cold rolled steel plate (JIS standard SPCC type, etc.). A cylindrical portion 20a fitted to the inner base portion 6b of the wheel mounting flange 6, a flange portion 23a extending radially outward from the cylindrical portion 20a, and a tip portion 49a extending in the axial direction from the flange portion 23a. And have.

  The seal member 50 is made of synthetic rubber such as nitrile rubber, and has a fixed base portion 50a fixed from the flange portion 23a of the cored bar 49 to the tip end portion 49a, and extends from the fixed base portion 50a so as to incline radially outward. The side lip 50b is formed in a trumpet shape whose tip end is enlarged. The side lip 50b is in sliding contact with the end surface 3c of the outer member 3 through a predetermined shimiro. And the fixed base part 50a of the seal member 50 opposes the end surface 3c of the outer member 3 through a slight axial clearance to constitute a labyrinth seal. By adopting such a configuration, it is possible to reliably prevent muddy water or the like from directly entering the seal 8, and the side lip 50b can be protected by the cylindrical tip portion 49a of the cored bar 49. Sealability can be ensured over a 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 according to the present invention can be applied to a wheel bearing device having a second to fourth generation structure regardless of whether it is for driving wheels or driven wheels.

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 the backup seal | sticker of FIG. It is a principal part enlarged view which shows the other modification of the backup seal | sticker of FIG. It is a principal part enlarged view which shows the modification of the backup seal | sticker of FIG. It is a principal part enlarged view which shows the other modification of the backup seal | sticker of FIG. It is a principal part enlarged view which shows the other modification of the backup seal | sticker of FIG. It is a principal part enlarged view which shows the other modification of the backup seal | sticker of FIG. It is a principal part enlarged view which shows the other modification of the backup seal | sticker of FIG. It is a principal part enlarged view which shows the other modification of the backup seal | sticker of FIG. It is a principal part enlarged view which shows the modification of the backup seal | sticker of FIG. It is a principal part enlarged view which shows the modification of the backup seal | sticker of FIG. It is a principal part enlarged view which shows the other modification of the backup seal | sticker 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). It is a longitudinal cross-sectional view which shows the other conventional wheel bearing apparatus.

Explanation of symbols

1 ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ Hub Wheel 1a ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ Shoulder 1b ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ Small diameter step 1c ・ ・ ・ ・ ・ ・ ・ ・ ・ ・···························································· Bearings for wheels 3. ..... Outer member 3a ... ... outside rolling surface 3b ... body mounting flange 3c ...・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ End face 4 of outer member ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・..Rolling elements 5・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ Inner ring 5a ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ Inner rolling surface 5b ... Daegu 5c ... ··························· 6・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ Hub bolt 6b ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ Base 7 ・ ・ ・ ・・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ Retainer 8, 25 ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・・ ・ Seal 9 ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ Sensor mounting hole 10・ ・ ・ ・ ・ ・ ・... Seal ring 11 ... Sensor 12 ... ... Harness 13 ... ... Magnetic encoder 14 ...・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ Metal rings 15, 26 ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ Seal plate 16 ・ ・・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ Slinger 16a, 20a, 34a ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ Cylinder 16b・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ Standing plate parts 17, 20, 23, 27, 32, 34, 38, 42, 44, 46, 49・ Core 17a, 30a ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ Fitting part 17 b ... Inner diameter part 18, 21, 24, 29, 50 ...・ Seal members 18a, 21b, 24b, 29a, 50b ・ ・ ・ ・ ・ ・ ・ ・ ・ Side lip 18b ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ Glee Slip 18c ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ Intermediate lip 19, 22, 28, 31, 33, 41, 43, 45, 48 ・ ・ Backup seal 20b, 23a ············································ 21 27a, 30b ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ Flange 30 ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・... Seal ring 32a・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ Rib 35 ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・Ridges 36, 40 ............... annular groove 39 ... ..... Folded pieces 42a, 44a, 46a ..... Tapered parts 42b, 49a ...・ ・ ・ ・ ・ ・ ・ ・ Tip 47 ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ Drain holes 51, 63 ... hub wheel 51a, 63a ... small diameter step 51b ... ... serrations 51c, 63b ... ··· Caulking parts 52 and 64 ····················· Wheel bearings 53 and 65・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ Outer members 53a, 65a ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ Outside rolling surfaces 53b, 65b ・ ・ ・ ・・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ Body mounting flange 54, 66 ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ Tapered roller 55, 67 ........... inner ring 55a, 67a ........... inner side Rolling surface 55b ........................ Daegu 55c ... ·················· 56, 68 ·························· Wheel mounting flange 5 6a ... Hub bolts 57, 69 ... ... Retainers 58, 70 ... Seal 59, 71 ...・ ・ ・ ・ ・ ・ ・ ・ Outer seal member 60 ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ Fixing member 61 ・ ・ ・ ・ ・ ・ ・ ・ ・·····················································································.・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ Seal lip 63 ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・.... Fixed base

Claims (14)

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;
It consists of a hub ring that has a wheel mounting flange for mounting a wheel at one end and a small-diameter step formed on the outer periphery, and an outer ring member of an inner ring or constant velocity universal joint fitted to this hub ring. An inner member in which a double row inner rolling surface facing the double row outer rolling surface is formed on the outer periphery;
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;
In the wheel bearing device provided with a seal attached to an opening of the annular space formed by the outer member and the inner member,
A backup seal is attached to the inner side base of the wheel mounting flange, and this backup seal is integrated with a metal core having a cylindrical portion that is press-fitted into the inner side base of the wheel mounting flange, by vulcanization adhesion to the metal core. And a sealing member having a side lip formed in a trumpet shape that extends in a radially outward direction and expands at a distal end thereof, and the wheel mounting flange and the outer member by the backup seal. A bearing device for a wheel, characterized in that a gap between the ends of the wheel is closed.   The wheel bearing device according to claim 1, wherein an annular rib protrudes from an end portion of the cylindrical portion of the core metal.   The wheel bearing device according to claim 1, wherein an annular protrusion is formed at a central portion of the cylindrical portion of the core metal, and the protrusion is engaged with an annular groove formed in the base portion.   The annular bent piece extending inward in the radial direction is formed at an end of the cylindrical portion of the core metal, and the bent piece is engaged with an annular groove formed in the base portion. Wheel bearing device.   The wheel bearing device according to any one of claims 1 to 4, wherein a tapered portion that is expanded or contracted radially outward from a cylindrical portion of the core metal is formed.   The wheel bearing device according to claim 5, wherein a drain hole is formed in the tapered portion.   The core bar has a flange portion extending radially outward from the cylindrical portion, and a distal end portion extending in the axial direction from the flange portion, and the distal end portion is slightly axial with the end surface of the outer member. The wheel bearing device according to any one of claims 1 to 4, wherein a labyrinth seal is formed so as to face each other through a gap.   The wheel bearing device according to any one of claims 1 to 7, wherein the side lip is slidably contacted with an end face of the outer member via a predetermined shimiro.   The wheel bearing device according to claim 8, wherein an end surface of the outer member is hardened by quenching.   At the end of the outer member, a seal ring formed by press working from a steel plate having rust prevention ability is mounted, and the seal ring is fitted into the outer periphery of the end of the outer member. A fitting portion and a flange portion extending radially inward from the fitting portion and closely contacting the end surface of the outer member, and the side lip is slidably contacted with the flange portion via a predetermined shimoshiro The wheel bearing device according to any one of claims 1 to 7.   The seal on the outer side of the seal is constituted by a pack seal composed of an annular seal plate and a slinger that have a substantially L-shaped cross section and are opposed to each other, and the seal plate is an end of the outer member. A cored bar having a cylindrical fitting part formed by pressing from a steel plate having a rust-preventing ability, and a seal member integrally joined to the cored bar by vulcanization adhesion And a flange portion extending radially outward from the fitting portion and in close contact with an end surface of the outer member is formed, and the side lip is slidably contacted with the flange portion via a predetermined shimiro. Item 8. The wheel bearing device according to any one of Items 1 to 7.   The wheel bearing device according to claim 11, wherein the seal member wraps around and is joined to the fitting portion of the cored bar.   The wheel bearing device according to claim 1, wherein the backup seal has a plurality of side lips.   The wheel bearing device according to any one of claims 1 to 13, wherein the core metal of the backup seal is formed by pressing from a steel plate having rust prevention ability.

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