JP2014020413A - Wheel bearing device - Google Patents

Abstract

A wheel bearing device capable of improving the sealing performance of a seal and maintaining the bearing performance over a long period of time is provided.
A cylindrical fitting portion in which a tapered surface 16 having a predetermined inclination angle is formed on an outer periphery of an end portion of an outer member 2 and a metal ring 12 is fitted on a shoulder portion 4e of a hub wheel. 12a, a curved portion 12b formed in an arc shape corresponding to the shape of the base portion 6b, and a disc portion 12c extending radially outward from the curved portion 12b and closely contacting the side surface 6c of the wheel mounting flange 6. An umbrella portion 12d that is axially spaced from the outer diameter portion of the disc portion 12c with respect to the wheel mounting flange 6 and that extends obliquely outward in the radial direction, and protrudes radially outward from the umbrella portion 12d. A bent portion 12e formed, a seal member 17 is integrally joined to the bent portion 12e, and the seal member 17 integrally has a seal lip 17a extending radially inward and extending outward. It is in sliding contact with the tapered surface 16 of the member 2.
[Selection] Figure 2

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 easily applied, a seal device is mounted to seal between the outer member and the inner member. 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.

  An example of such a seal is shown in FIG. The seal 108 is disposed so as to be in sliding contact with the metal ring 112 fitted to the base portion 106 b of the wheel mounting flange 106. The seal 108 includes a core metal 113 fitted to the inner periphery of the end portion of the outer member 102 and a seal member 114 integrally joined to the core metal 113 by vulcanization adhesion or the like.

  The seal member 114 is joined to the outer peripheral portion of the cored bar 113, joined to a pair of side lips 114a and 114b extending obliquely outward in the radial direction, and the inner edge of the cored bar 113, and tilted to the bearing inward side. And a grease lip 114c extending in the direction. The side lips 114 a and 114 b and the grease lip 114 c are in sliding contact with the metal ring 112 fitted to the base portion 106 b of the wheel mounting flange 106.

  The metal ring 112 is formed by press working from a steel plate having corrosion resistance, and corresponds to a cylindrical fitting portion 112a that is externally fitted to the shoulder portion 104e of the hub wheel 104 and a base portion 106b that is formed in an arc shape. From a curved portion 112b formed in an arc shape, a disk portion 112c extending radially outward from the curved portion 112b and being in close contact with the side surface 106c of the wheel mounting flange 106, and an outer diameter portion of the disk portion 112c An umbrella portion 112d extending away from the wheel mounting flange 106 in the axial direction is provided, and a bent portion 112e formed to protrude radially outward from the umbrella portion 112d.

  The base portion 106 b is formed in an arc surface having a predetermined radius of curvature r at a corner portion between the shoulder portion 104 e of the hub wheel 104 and the wheel mounting flange 106. Corresponding to this arc surface, the curved portion 112b of the metal ring 112 is formed of an arc surface having a predetermined curvature radius R, and the respective curvature radii R and r are set such that R ≧ r. Thus, when the metal ring 112 is fitted to the base portion 106b, the curved portion 112b of the metal ring 112 is prevented from interfering with the arc surface of the base portion 106b and rising. Therefore, a gap is prevented from being generated between the side surface 106c of the wheel mounting flange 106 and the disk portion 112c of the metal ring 112, and both are brought into close contact with each other, and the stable squeezing is suppressed by suppressing variations in the side lips 114a and 114b. Sex can be secured.

  Further, a tapered surface 102c having a predetermined inclination angle θ1 is formed on the outer periphery of the outer end portion of the outer member 102. On the other hand, the umbrella portion 112d of the metal ring 112 has a predetermined inclination angle θ2 corresponding to the tapered surface 102c of the outer member 102, and is formed in a tapered shape that gradually increases in diameter toward the end portion. A slight annular gap A is formed between the tapered surface 102c and a labyrinth seal. The inclination angles θ1 and θ2 are set in a range of 15 ° to 30 ° so as to be substantially the same angle, and the gap A is set in a range of 0.05 to 1.0 mm (diameter).

  Thus, the labyrinth effect formed by the inner peripheral surface of the umbrella portion 112d and the tapered surface 102c of the outer member 102 prevents muddy water or the like from entering the sliding contact portion between the seal 108 and the metal ring 112. In addition, even if muddy water or the like enters the inside of the metal ring 112 from the slight gap A, it is easily discharged to the outside by the centrifugal force accompanying the rotation of the metal ring 112 as shown by the arrow in the figure. , It does not stay on the side lip 114a. Therefore, muddy water or the like can be prevented from adhering to the sliding contact surface of the side lip 114a and being worn, and a stable sealing performance can be maintained over a long period of time (see, for example, Patent Document 1).

JP 2010-032013 A

  However, the seal 108 of such a conventional wheel bearing device can prevent the muddy water transmitted from the hub wheel 104 side from entering the bearing, but the muddy water transmitted from the outer member 102 side can be prevented. Therefore, there is a risk of entering from the gap between the metal ring 112 and the outer member 102, and it is difficult to maintain a stable sealing property over a long period of time.

  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 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 both side openings of an annular space formed between the outer member and the inner member; The base portion on the inner side of the wheel mounting flange is formed in an arc shape, and the base portion is made of steel. A metal ring formed by press working is fitted, and the outer seal of the seals is fitted to the inner periphery of the end of the outer member, and the core is vulcanized. The seal member comprises a seal member having a side lip that is joined integrally by adhesion and that extends obliquely outward in the radial direction and a grease lip that extends obliquely inward of the bearing, and the side lip of the seal member is attached to the metal ring. In the wheel bearing device slidably contacted, the metal ring includes a cylindrical fitting portion that is fitted on a shoulder portion of the hub wheel, and a curved portion that is formed in an arc shape corresponding to the shape of the base portion. And a disc portion extending radially outward from the curved portion and attached to the inner side surface of the wheel mounting flange, and an axial direction from the outer diameter portion of the disc portion to the wheel mounting flange. An umbrella portion that is spaced apart and extends obliquely outward in the radial direction; A seal member is integrally joined to the tip of the umbrella portion by vulcanization adhesion, and the seal member integrally has a seal lip extending inwardly in the radial direction, and the outer periphery of the end of the outer member Is in sliding contact.

  In this way, the base portion on the inner side of the wheel mounting flange is formed in an arc shape, and a metal ring formed by pressing from a steel plate is fitted to this base portion, and the seal on the outer side is attached to the outer member. Seal member having a metal core fitted to the inner periphery of the end, a side lip integrally joined to the metal core, extending obliquely outward in the radial direction, and a grease lip extending inclined toward the inner side of the bearing In the wheel bearing device in which the side lip of the seal member is slidably contacted with the metal ring, the metal ring corresponds to the shape of the cylindrical fitting portion and the base portion that are fitted on the shoulder portion of the hub wheel. A curved portion formed in an arc shape, a disc portion extending radially outward from the curved portion and mounted on the inner side surface of the wheel mounting flange, and a wheel from the outer diameter portion of the disc portion Separated axially from the mounting flange and radially outward An umbrella portion extending obliquely, a seal member is integrally joined to the tip portion of the umbrella portion by vulcanization adhesion, and this seal member integrally has a seal lip extending inwardly in the radial direction, Since the outer member is in sliding contact with the outer periphery of the end portion, it is possible to reliably prevent muddy water from entering the sliding contact portion between the outer seal and the metal ring. It is possible to provide a wheel bearing device that can prevent adhesion and wear on a contact surface, improve the sealing performance of the seal, and maintain the bearing performance for a long period of time.

  Preferably, as in the invention according to claim 2, a predetermined arc surface or a tapered surface having a predetermined inclination angle is formed on the outer periphery of the outer end portion of the outer member, and the tip of the umbrella portion If the bent portion is formed projecting radially outward from the portion, the seal member is joined to the bent portion, and the seal lip is in sliding contact with the arc surface or the tapered surface of the outer member, While improving the rigidity of a metal ring, the dimension and shape precision of a metal ring can be improved.

  Further, as in the invention according to claim 3, if the sealing member of the metal ring is joined so as to cover the exposed outer surface, the vulcanizability of the sealing member can be facilitated, and the metal Corrosion resistance of the ring can be increased.

  According to a fourth aspect of the present invention, in addition to the seal lip, the seal member of the metal ring extends to the inner diameter side of the seal lip and further inclines radially inward, and the outer member If the seal lip that is in sliding contact with the outer seal is integrally provided, the muddy water resistance of the outer seal can be increased.

  Further, as in the fifth aspect of the present invention, if grease is previously applied to the seal lip of the metal ring, it is possible to reduce the bearing rotational torque and improve the wear resistance of the seal lip. And a stable sealing property can be maintained over a long period of time.

  In addition, as in the invention described in claim 6, a predetermined arc surface is formed on the outer periphery of the outer side end portion of the outer member, and the arc surface is formed with a radius of curvature centered on the bearing center O. In addition, if a slight annular gap is formed between the metal ring umbrella and the labyrinth, a change in the annular gap is suppressed even when the axle is tilted when the vehicle turns. Further, it is possible to prevent muddy water or the like from entering the sliding contact portion between the outer side seal and the metal ring.

  Further, as in the invention according to claim 7, the base portion on the inner side of the wheel mounting flange is formed in an arc surface having a predetermined radius of curvature r, and the curve of the metal ring is corresponding to the arc surface. If the part is formed on a circular arc surface having a predetermined radius of curvature R and each of the curvature radii R and r is set to satisfy R ≧ r, the metal ring is fitted to the base part when the metal ring is fitted to the base part. It is possible to prevent the curved portion of the metal ring from interfering and floating, and to prevent a gap from being generated between the side surface of the wheel mounting flange and the disk portion of the metal ring. As a result, both can be in close contact with each other to suppress the unevenness of the side lip and to ensure stable sealing.

  Further, as in the invention described in claim 8, the elastic member is integrally joined by vulcanization bonding from the disk portion of the metal ring to the umbrella portion, and elastically applied to the inner side surface of the wheel mounting flange. If contacted, prevent foreign matter from entering from between the side surface of the wheel mounting flange and the disk part of the metal ring, and prevent rusting of the base part and the metal ring mounting part for 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 plurality of rolling elements accommodated in a freely rolling manner, and seals attached to both side openings of an annular space formed between the outer member and the inner member; The base on the side is formed in an arc shape, and this base is formed by pressing from a steel plate. A metal ring is fitted, and a seal on the outer side of the seal is integrally joined to a core metal fitted to an inner periphery of an end of the outer member by vulcanization adhesion, A wheel bearing comprising a seal member having a side lip extending obliquely outward in the radial direction and a grease lip extending inclined toward the inner side of the bearing, wherein the side lip of the seal member is in sliding contact with the metal ring. In the apparatus, the metal ring includes a cylindrical fitting portion that is fitted on a shoulder portion of the hub wheel, a curved portion formed in an arc shape corresponding to the shape of the base portion, and a diameter from the curved portion. A disk part that extends outward in the direction and is mounted on the inner side surface of the wheel mounting flange, and is axially spaced from the outer diameter part of the disk part with respect to the wheel mounting flange. And an umbrella portion extending at an angle to the tip of the umbrella portion. The seal member is integrally joined by vulcanization adhesion, and the seal member integrally has a seal lip extending inwardly in the radial direction, and is in sliding contact with the outer periphery of the end portion of the outer member. Muddy water or the like can be reliably prevented from entering the sliding contact portion between the outer side seal and the metal ring, and muddy water can be prevented from adhering to the sliding surface of the side lip and wearing away. In addition, it is possible to provide a wheel bearing device capable of improving the sealing performance of the seal and maintaining the bearing performance over a long period of time.

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 which shows the seal part of FIG. It is a principal part enlarged view which shows the modification of the seal | sticker of FIG. FIG. 9 is an enlarged view of the main part showing another modification of the seal of FIG. FIG. 9 is an enlarged view of the main part showing another modification of the seal of FIG. FIG. 9 is an enlarged view of the main part showing another modification of the seal of FIG. FIG. 9 is an enlarged view of the main part showing another modification of the seal of FIG. It is a longitudinal cross-sectional view which shows 2nd Embodiment of the wheel bearing apparatus which concerns on this invention. It is a principal part enlarged view which shows the seal part of FIG. It is a principal part enlarged view which shows the modification of the seal | sticker of FIG. FIG. 10 is an enlarged view of a main part showing another modified example of the seal of FIG. FIG. 10 is an enlarged view of a main part showing another modified example of the seal of FIG. FIG. 10 is an enlarged view of a main part showing another modified example of the seal of FIG. FIG. 10 is an enlarged view of a main part showing another modified example of the seal of FIG. FIG. 10 is an enlarged view of a main part showing another modified example of the seal of FIG. FIG. 10 is an enlarged view of a main part showing another modified example of the seal of FIG. FIG. 10 is an enlarged view of a main part showing another modified example of the seal of FIG. FIG. 10 is an enlarged view of a main part showing another modified example of the seal of FIG. It is a principal part enlarged view which shows the sealing device of the conventional wheel bearing apparatus.

  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 wheel in which an inner rolling surface facing one of the double row outer rolling surfaces and a small-diameter step portion extending in the axial direction from the inner rolling surface are formed on the outer periphery, and the hub An inner member formed of an inner ring that is press-fitted into a ring through a predetermined squeeze and has an inner rolling surface that faces the other of the outer rolling surfaces of the double row 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. And a base portion on the inner side of the wheel mounting flange is formed in an arc shape. A metal ring formed by pressing from a steel plate is fitted on the outer side of the seal, and a core metal fitted to the inner periphery of the end of the outer member, and the core metal The seal member has a side lip that is integrally joined and extends to incline radially outward and a grease lip that inclines and extends inward of the bearing, and the side lip of the seal member is in sliding contact with the metal ring. In the wheel bearing device according to the present invention, a tapered surface having a predetermined inclination angle is formed on the outer periphery of the outer end of the outer member, and the metal ring is externally fitted to the shoulder of the hub wheel. A fitting portion, a curved portion formed in an arc shape corresponding to the shape of the base portion, and a circle extending radially outward from the curved portion and attached to the inner side surface of the wheel mounting flange From the plate part and the outer diameter part of this disk part An umbrella portion that is axially spaced from the wheel mounting flange and extends obliquely outward in the radial direction, and a bent portion that protrudes radially outward from the tip portion of the umbrella portion. A sealing member is integrally joined to the curved portion by vulcanization bonding, and this sealing member integrally has a sealing lip extending inclining radially inward, and is in sliding contact with the tapered surface of the outer member.

Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.
1 is a longitudinal sectional view showing a first embodiment of a wheel bearing device according to the present invention, FIG. 2 is an enlarged view of a main part showing a seal part of FIG. 1, and FIG. 3 is a modification of the seal of FIG. The principal part enlarged view which shows an example, FIGS. 4-7 is a principal part enlarged view which shows the other modification of the seal | sticker of FIG. In the following description, the side closer to the outer side of the vehicle when assembled to the vehicle is referred to as the 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).

  The wheel bearing device shown in FIG. 1 is for a drive wheel called a third generation, and is externally inserted into the inner member 1 and the inner member 1 through double-row rolling elements (balls) 3. The outer member 2 is provided. The inner member 1 includes a hub ring 4 and an inner ring 5 fixed to the hub ring 4.

  The hub wheel 4 integrally has a wheel mounting flange 6 for mounting a wheel (not shown) at an end portion on the outer side, and has one (outer side) inner rolling surface 4a on the outer periphery and the inner rolling surface. A small diameter step 4b extending in the axial direction from the surface 4a is formed, and a serration (or spline) 4c for torque transmission is formed on the inner periphery. Hub bolts 6a are planted on the wheel mounting flange 6 at equal intervals in the circumferential direction. The inner ring 5 is formed with the other (inner side) inner rolling surface 5a on the outer periphery, and is press-fitted into the small-diameter step portion 4b of the hub wheel 4 through a predetermined shimoshiro, and the end portion of the small-diameter step portion 4b has a diameter. A predetermined bearing preload is applied to the hub wheel 4 in the axial direction by a caulking portion 4d formed by plastic deformation outward in the direction.

  The hub wheel 4 is made of medium and high carbon steel containing 0.40 to 0.80 wt% of carbon such as S53C, and has a surface hardness by induction quenching from the base 6b on the inner side of the wheel mounting flange 6 to the small diameter step 4b. Is cured in the range of 58 to 64 HRC. The caulking portion 4d is an unquenched portion with the surface hardness after forging. This has sufficient mechanical strength against the rotational bending load applied to the wheel mounting flange 6, improves the fretting resistance of the small-diameter stepped portion 4b serving as the fitting portion of the inner ring 5, and performs caulking. A micro crack or the like is prevented from occurring in the caulking portion 4d due to the processing.

  The outer member 2 integrally has a vehicle body mounting flange 2b to be attached to a knuckle (not shown) on the outer periphery, and faces the double row inner rolling surfaces 4a and 5a of the inner member 1 on the inner periphery. Double row outer rolling surfaces 2a, 2a are integrally formed. The outer member 2 is formed of medium-high carbon steel containing 0.40 to 0.80 wt% of carbon such as S53C, and at least the double row outer rolling surfaces 2a and 2a have a surface hardness of 58 to 64 HRC by induction hardening. Hardened to range. And the double row rolling elements 3 and 3 are accommodated between both rolling surfaces of the outer member 2 and the inner member 1, and are held by the cages 7 and 7 so as to roll freely. It constitutes a ball bearing. The inner ring 5 and the rolling element 3 are made of high carbon chrome steel such as SUJ2, and are hardened in the range of 58 to 64 HRC to the core part by quenching.

  Further, seals 8 and 9 are attached to the opening of the annular space formed between the outer member 2 and the inner member 1. These seals 8 and 9 prevent the grease sealed inside the bearing from leaking outside and preventing rainwater, dust, and the like from entering the bearing from the outside. The inner side seal 9 constitutes a so-called pack seal composed of an annular seal plate 10 and a slinger 11 which are substantially L-shaped in cross section and arranged to face each other.

  Here, in the present embodiment, the metal ring 12 is fitted to the inner side base portion 6 b of the wheel mounting flange 6, and the outer side seal 8 is disposed so as to be in sliding contact with the metal ring 12. As shown in an enlarged view in FIG. 2, the seal 8 is integrally joined to the core bar 13 fitted to the inner periphery of the outer end of the outer member 2 by vulcanization bonding or the like. And a seal member 14. The core 13 is made of an austenitic stainless steel plate (JIS standard SUS304, etc.) or a rust-proof cold-rolled steel plate (JIS standard SPCC, etc.), and the cross section is substantially U-shaped by pressing. Is formed.

  On the other hand, the seal member 14 is joined to the outer peripheral portion of the cored bar 13 and joined to the pair of side lips 14a and 14b extending obliquely outward in the radial direction and the inner edge part of the cored bar 13, and to the bearing inner side. It has a grease lip 14c extending in an inclined manner. These side lips 14 a and 14 b and the grease lip 14 c are in sliding contact with the metal ring 12 fitted to the base portion 6 b on the inner side of the wheel mounting flange 6. The seal member 14 is wrapped around and joined to the fitting portion of the core metal 13 to prevent foreign matter such as muddy water from entering the bearing from the fitting portion of the outer member 2 and the core metal 13. Yes.

  The metal ring 12 is formed from a steel plate having corrosion resistance, for example, an austenitic stainless steel plate, or a cold-rolled steel plate that has been rust-proofed by pressing, and is a cylindrical shape that is externally fitted to the shoulder 4e of the hub ring 4. A fitting portion 12a, a curved portion 12b formed in an arc shape corresponding to the base portion 6b formed in an arc shape, and extending radially outward from the curved portion 12b, on the inner side of the wheel mounting flange 6 A disc portion 12c that is in close contact with (attached to) the side surface 6c, an umbrella portion 12d that extends from the outer diameter portion of the disc portion 12c in the axial direction with respect to the wheel mounting flange 6, and that extends at an angle, and the umbrella portion A bent portion 12e is formed so as to protrude radially outward from 12d. The bent portion 12e is provided in order to improve the rigidity of the metal ring 12, and can improve the dimensional and shape accuracy of the metal ring 12.

  In addition, as for this metal ring 12, the surface roughness of the steel plate used as a raw material is set to the range of Ra0.2-0.6. Thereby, a favorable seal sliding contact surface can be obtained, lip wear can be suppressed, and the sealing performance of the seal 8 can be maintained even when used in a poor environment. Note that Ra is one of JIS roughness shape parameters (JIS B0601-1994), and is an arithmetic average roughness, which means an average value of absolute value deviations from an average line.

  The base portion 6 b is formed in an arc surface having a predetermined radius of curvature r at a corner portion between the shoulder portion 4 e of the hub wheel 4 and the inner side surface 6 c of the wheel mounting flange 6. Corresponding to the arc surface, the curved portion 12b of the metal ring 12 is formed of an arc surface having a predetermined radius of curvature R, and the respective curvature radii R and r are set such that R ≧ r. Thereby, when the metal ring 12 is fitted to the base portion 6b, the curved portion 12b of the metal ring 12 is prevented from interfering with the arc surface of the base portion 6b and rising. Therefore, a gap is prevented from being generated between the side surface 6c of the wheel mounting flange 6 and the disk portion 12c of the metal ring 12, and the both are brought into close contact with each other, and the stable sealing is achieved by suppressing variations in the side lips 14a and 14b. Sex can be secured.

  Moreover, in this embodiment, the elastic member (packing) 15 which consists of synthetic rubber etc. is integrally joined by the vulcanization adhesion ranging from the disc part 12c of the metal ring 12 to the umbrella part 12d. And it is in elastic contact with the side surface 6 c of the wheel mounting flange 6. This prevents foreign matter from entering from between the side surface 6c of the wheel mounting flange 6 and the disc portion 12c of the metal ring 12, and rusting of the mounting portion of the base portion 6b and the metal ring 12 over a long period of time. Can be prevented.

  Here, a tapered surface 16 having a predetermined inclination angle θ3 is formed on the outer periphery of the outer end portion of the outer member 2. On the other hand, the umbrella portion 12d of the metal ring 12 is provided with a predetermined inclination angle θ4 corresponding to the tapered surface 16 of the outer member 2, and is formed in a tapered shape that gradually increases in diameter toward the bent portion 12e. A seal member 17 made of synthetic rubber or the like is integrally joined to the bent portion 12e of the metal ring 12 by vulcanization adhesion. The seal member 17 extends inward in the radial direction and integrally includes a seal lip 17 a that is in sliding contact with the tapered surface 16 of the outer member 2. The inclination angles θ3 and θ4 are set in a range of 15 ° to 30 ° so as to be substantially the same angle.

  In this way, the seal lip 17a of the seal member 17 joined to the metal ring 12 is in sliding contact with the tapered surface 16 of the outer member 2, so that muddy water or the like is formed in the sliding contact portion between the seal 8 and the metal ring 12. Can be reliably prevented from entering, muddy water or the like can be prevented from adhering to the sliding contact surface of the side lip 14a and worn, and a stable sealing performance can be maintained over a long period of time.

  Here, the third generation structure on the driven wheel side is exemplified as the wheel bearing device, but the wheel bearing device according to the present invention is not limited to this, and the second generation or the fourth generation is applicable as long as the structure is applicable. It may be a generation. Furthermore, in the present embodiment, an example of a double-row angular contact ball bearing using balls as the rolling elements 3 is illustrated, but it is not limited to this, and a double-row tapered roller bearing using tapered rollers as the rolling elements is used. It may be configured.

  FIG. 3 shows a modification. This embodiment is basically the same as the above-described embodiment (FIG. 2) except that the configuration of the seal member 17 is different, and other parts and parts having the same parts or parts having the same functions are denoted by the same reference numerals. The detailed explanation is omitted.

  The metal ring 12 is formed in an arc shape corresponding to the cylindrical fitting portion 12a fitted on the shoulder portion 4e of the hub wheel 4 and the base portion 6b formed in an arc shape, as in the embodiment described above. A curved portion 12b, a disk portion 12c extending radially outward from the curved portion 12b and in close contact with the inner side surface 6c of the wheel mounting flange 6, and a wheel mounting from the outer diameter portion of the disk portion 12c. An umbrella portion 12d that is spaced apart from the flange 6 in the axial direction and extends in an inclined manner, and a bent portion 12e that protrudes radially outward from the umbrella portion 12d are provided. Then, a sealing member 18 made of synthetic rubber or the like is integrally joined to the bent portion 12e by vulcanization adhesion, and a sealing lip 17a that extends inwardly in the radial direction and slidably contacts the tapered surface 16 of the outer member 2 is provided. It has one.

  Here, the seal member 18 is joined so as to cover the exposed outer surface of the bent portion 12 e of the metal ring 12. Thereby, while being able to make the vulcanization property of the sealing member 18 easy, the corrosion resistance of the bending part 12e can be improved.

  FIG. 4 shows another modification. In this embodiment, basically only the configuration of the seal member 17 of the above-described embodiment (FIG. 2) is partially different, and the same reference numerals are given to the same parts or parts having the same functions or parts having the same functions. Detailed description is omitted.

  The metal ring 12 is formed in an arc shape corresponding to the cylindrical fitting portion 12a fitted on the shoulder portion 4e of the hub wheel 4 and the base portion 6b formed in an arc shape, as in the embodiment described above. A curved portion 12b, a disk portion 12c extending radially outward from the curved portion 12b and in close contact with the inner side surface 6c of the wheel mounting flange 6, and a wheel mounting from the outer diameter portion of the disk portion 12c. An umbrella portion 12d that is spaced apart from the flange 6 in the axial direction and extends in an inclined manner, and a bent portion 12e that protrudes radially outward from the umbrella portion 12d are provided. Then, a sealing member 19 made of synthetic rubber or the like is integrally joined to the bent portion 12e by vulcanization adhesion, and a sealing lip 17a that extends inwardly in the radial direction and slidably contacts the tapered surface 16 of the outer member 2 is provided. It has one.

  Here, in addition to the seal lip 17a, the seal member 19 extends further inwardly in the radial direction on the inner diameter side of the seal lip 17a, and the seal lip 19a that is in sliding contact with the tapered surface 16 of the outer member 2 is integrated. Have. Thereby, the mud water resistance of the seal 8 can be increased.

  FIG. 5 shows another modification. In this embodiment, basically, the structure of the metal ring of the above-described embodiment (FIG. 2) is only partially different, and the same parts are denoted by the same reference numerals for the same parts or parts having the same functions. Detailed description is omitted.

  The metal ring 12 ′ includes a cylindrical fitting portion 12 a that is externally fitted to the shoulder portion 4 e of the hub wheel 4, a curved portion 12 b that is formed in an arc shape corresponding to the base portion 6 b that is formed in an arc shape, A disc portion 12c that extends radially outward from the curved portion 12b and is in close contact with the side surface 6c on the inner side of the wheel mounting flange 6, and a shaft with respect to the wheel mounting flange 6 from the outer diameter portion of the disc portion 12c. And an umbrella portion 12d extending in an inclined manner. Then, a sealing member 20 made of synthetic rubber or the like is integrally joined to the umbrella portion 12d by vulcanization bonding, extends in a radially inward direction, and has a sealing lip 20a slidably contacting the tapered surface 16 of the outer member 2. It has one.

  Here, the seal member 20 is joined so as to cover the exposed outer surface of the umbrella portion 12d of the metal ring 12 '. Thereby, the moldability of the metal ring 12 ′ and the vulcanization property of the seal member 20 can be facilitated, and the corrosion resistance of the umbrella portion 12 d can be enhanced.

  FIG. 6 shows another modification. In this embodiment, basically only the configuration of the seal member 17 of the above-described embodiment (FIG. 2) is partially different, and the same reference numerals are given to the same parts or parts having the same functions or parts having the same functions. Detailed description is omitted.

  The metal ring 12 is formed in an arc shape corresponding to the cylindrical fitting portion 12a fitted on the shoulder portion 4e of the hub wheel 4 and the base portion 6b formed in an arc shape, as in the embodiment described above. A curved portion 12b, a disk portion 12c extending radially outward from the curved portion 12b and in close contact with the inner side surface 6c of the wheel mounting flange 6, and a wheel mounting from the outer diameter portion of the disk portion 12c. An umbrella portion 12d that is spaced apart from the flange 6 in the axial direction and extends in an inclined manner, and a bent portion 12e that protrudes radially outward from the umbrella portion 12d are provided. And the sealing member 21 which consists of synthetic rubber etc. is integrally joined to this bending part 12e by vulcanization adhesion. The seal member 21 extends obliquely inward in the radial direction, and integrally has a seal lip 21a opposed to the tapered surface 16 of the outer member 2 with a slight gap C to constitute a labyrinth. When this gap C becomes large, muddy water or the like easily enters, so that one side (radius) is set to 0.5 mm or less.

  Thus, the labyrinth effect formed by the seal lip 21a and the tapered surface 16 of the outer member 2 can prevent muddy water and the like from entering the sliding contact portion between the seal 8 and the metal ring 12. The bearing rotational torque can be reduced. Therefore, muddy water or the like can be prevented from adhering to the sliding contact surface of the side lip 14a and being worn, and a stable sealing performance can be maintained over a long period of time.

  FIG. 7 shows another modification. This embodiment basically differs only in the configuration of the seal lip portion 17a of the above-described embodiment (FIG. 2), and the same reference numerals are given to the same parts or parts having the same functions or parts having the same functions. Detailed description is omitted.

  The metal ring 12 is formed in an arc shape corresponding to the cylindrical fitting portion 12a fitted on the shoulder portion 4e of the hub wheel 4 and the base portion 6b formed in an arc shape, as in the embodiment described above. A curved portion 12b, a disk portion 12c extending radially outward from the curved portion 12b and in close contact with the inner side surface 6c of the wheel mounting flange 6, and a wheel mounting from the outer diameter portion of the disk portion 12c. An umbrella portion 12d that is spaced apart from the flange 6 in the axial direction and extends in an inclined manner, and a bent portion 12e that protrudes radially outward from the umbrella portion 12d are provided. Then, a sealing member 17 made of synthetic rubber or the like is integrally joined to the bent portion 12e by vulcanization adhesion, and a sealing lip 17a that extends inwardly in the radial direction and slidably contacts the tapered surface 16 of the outer member 2 is provided. It has one.

  Here, grease 22 is applied in advance to the seal lip 17a. As a result, the rotational torque of the bearing can be reduced, the wear resistance of the seal lip 17a can be improved, and the stable sealing performance can be maintained over a long period of time.

  8 is a longitudinal sectional view showing a second embodiment of the wheel bearing device according to the present invention, FIG. 9 is an enlarged view of a main part showing the seal part of FIG. 8, and FIG. 10 is a modification of the seal of FIG. The principal part enlarged view which shows an example, FIGS. 11-18 are principal part enlarged views which show the other modification of the seal | sticker of FIG. The same parts and parts as those of the above-described embodiment or parts and parts having the same functions are denoted by the same reference numerals and detailed description thereof is omitted.

  The wheel bearing device shown in FIG. 8 is for a driving wheel called the third generation, and is an inner member 1 and an outer member externally inserted into the inner member 1 through double-row rolling elements 3. And a member 23. The inner member 1 includes a hub ring 4 and an inner ring 5 fixed to the hub ring 4.

  The outer member 23 integrally has a vehicle body mounting flange 2b on the outer periphery, and the double row outer rolling surfaces 2a, 2a facing the double row inner rolling surfaces 4a, 5a of the inner member 1 on the inner periphery. It is integrally formed. The outer member 23 is made of medium-high carbon steel containing 0.40 to 0.80 wt% of carbon such as S53C.

  Further, seals 8 and 9 are attached to an opening portion of an annular space formed between the outer member 23 and the inner member 1. These seals 8 and 9 prevent the grease sealed inside the bearing from leaking outside and preventing rainwater, dust, and the like from entering the bearing from the outside. In the present embodiment, the metal ring 24 is fitted to the inner side base portion 6 b of the wheel mounting flange 6, and the outer side seal 8 is disposed so as to be in sliding contact with the metal ring 24.

  As shown in an enlarged view in FIG. 9, the metal ring 24 has an arcuate shape corresponding to a cylindrical fitting portion 12a fitted on the shoulder portion 4e of the hub wheel 4 and a base portion 6b formed in an arc shape. A curved portion 12b formed on the outer circumferential portion, a disc portion 12c extending radially outward from the curved portion 12b and closely contacting the inner side surface 6c of the wheel mounting flange 6, and an outer diameter portion of the disc portion 12c. The wheel mounting flange 6 is separated from the wheel mounting flange 6 in the axial direction, and is provided with an umbrella portion 24a made of a predetermined arc surface and a bent portion 12e formed to protrude radially outward from the umbrella portion 24a.

  Here, on the outer periphery of the outer end of the outer member 23, an arcuate surface 25 having a radius of curvature R0 with the bearing center O as the center is formed. On the other hand, the umbrella portion 24 a of the metal ring 24 is formed with a radius of curvature R <b> 1 centering on the bearing center O corresponding to the circular arc surface 25 of the outer member 2. These radii of curvature R0, R1 are set to R0 <R1, and a slight annular gap D (D = R1-R0) is provided between the umbrella portion 24a of the metal ring 24 and the arc surface 25 of the outer member 23. Formed and constitutes a labyrinth. The gap D is set in a range of 0.03 to 0.5 mm (radius). If the gap D is less than 0.03 mm, the umbrella portion 24a may interfere with the outer member 23 due to dimensional variation or eccentricity of the metal ring 24 or the outer member 23. It is not preferable because it easily enters.

  In this way, the umbrella portion 24a of the metal ring 24 and the arc surface 25 of the outer member 23 are formed at the radii of curvature R1 and R0 with the bearing center O as the center, and the umbrella portion 24a and the arc surface 25 of the outer member 23 Since a slight annular gap D is formed between them to form a labyrinth, even if the axle is tilted when the vehicle turns, the annular gap D is suppressed from changing, and the seal 8 and the metal ring 24 are suppressed. It is possible to prevent muddy water or the like from entering the sliding contact portion.

  FIG. 10 shows another modification. In this embodiment, basically only the configuration of a part of the metal ring 24 of the above-described embodiment (FIG. 9) is different, and the same reference numerals are given to the same parts or parts having the same function. Therefore, detailed description is omitted.

  The metal ring 24 ′ includes a cylindrical fitting portion 12 a that is fitted on the shoulder portion 4 e of the hub wheel 4, a curved portion 12 b that is formed in an arc shape corresponding to the base portion 6 b that is formed in an arc shape, A disc portion 12c that extends radially outward from the curved portion 12b and is in close contact with the side surface 6c on the inner side of the wheel mounting flange 6, and a shaft with respect to the wheel mounting flange 6 from the outer diameter portion of the disc portion 12c. It is provided with an umbrella portion 24a that is spaced in the direction and has a predetermined arc surface.

  Here, on the outer periphery of the outer end portion of the outer member 23, an arc surface 25 having a radius of curvature R0 centered on the bearing center O is formed, and the umbrella portion 24a of the metal ring 24 is centered on the bearing center O. It is formed in the curvature radius R1. A slight annular gap D is formed between the umbrella portion 24a and the circular arc surface 25, thereby constituting a labyrinth.

  In this way, the umbrella portion 24a of the metal ring 24 and the arc surface 25 of the outer member 23 are formed at the radii of curvature R1 and R0 with the bearing center O as the center, and the umbrella portion 24a and the arc surface 25 of the outer member 23 Since a slight annular gap D is formed between them to form a labyrinth, even if the axle is tilted when the vehicle turns, the annular gap D is suppressed from changing, and the seal 8 and the metal ring 24 are suppressed. It is possible to prevent muddy water or the like from entering the sliding contact portion.

  FIG. 11 shows another modification. In this embodiment, basically only the configuration of a part of the metal ring 24 of the above-described embodiment (FIG. 9) is different, and the same reference numerals are given to the same parts or parts having the same function. Therefore, detailed description is omitted.

  The metal ring 24 is formed in an arc shape corresponding to the cylindrical fitting portion 12a fitted on the shoulder portion 4e of the hub wheel 4 and the base portion 6b formed in an arc shape, as in the above-described embodiment. A curved portion 12b, a disk portion 12c extending radially outward from the curved portion 12b and in close contact with the inner side surface 6c of the wheel mounting flange 6, and a wheel mounting from the outer diameter portion of the disk portion 12c. An umbrella portion 24a that is spaced apart from the flange 6 in the axial direction and has a predetermined arc surface, and a bent portion 12e that protrudes radially outward from the umbrella portion 24a are provided.

  Here, a covering member 26 made of synthetic rubber or the like is integrally joined by vulcanization adhesion so as to cover the exposed outer surface of the bent portion 12e. Thereby, while making moldability of the metal ring 24 easy, corrosion resistance of the bending part 12e can be improved.

  FIG. 12 shows another modification. In this embodiment, basically only the configuration of a part of the metal ring 24 of the above-described embodiment (FIG. 9) is different, and the same reference numerals are given to the same parts or parts having the same function. Therefore, detailed description is omitted.

  In the present embodiment, the covering member 27 made of synthetic rubber or the like is integrally joined by vulcanization adhesion so as to cover the exposed inner surfaces of the umbrella portion 24a and the bent portion 12e. The inner surface of the covering member 27 is formed with a radius of curvature R2 centered on the bearing center O. Thereby, the corrosion resistance of the umbrella part 24a and the bending part 12e can be improved.

  FIG. 13 shows another modification. This embodiment is basically the same as the above-described embodiment (FIG. 9) except that the structure of the metal ring 24 is different, and other parts and parts having the same parts or parts having the same functions are denoted by the same reference numerals. The detailed explanation is omitted.

  The metal ring 12 is formed in an arc shape corresponding to the cylindrical fitting portion 12a fitted on the shoulder portion 4e of the hub wheel 4 and the base portion 6b formed in an arc shape, as in the embodiment described above. A curved portion 12b, a disk portion 12c extending radially outward from the curved portion 12b and in close contact with the inner side surface 6c of the wheel mounting flange 6, and a wheel mounting from the outer diameter portion of the disk portion 12c. An umbrella portion 12d that is spaced apart from the flange 6 in the axial direction and extends in an inclined manner, and a bent portion 12e that protrudes radially outward from the umbrella portion 12d are provided.

  Here, a covering member 28 made of synthetic rubber or the like is integrally joined by vulcanization adhesion so as to cover the exposed inner surfaces of the umbrella portion 12d and the bent portion 12e. The inner surface of the covering member 28 is formed with a radius of curvature R2 centered on the bearing center O. Thereby, while being able to improve the corrosion resistance of the umbrella part 12d and the bending part 12e, even when an axle tilts at the time of turning of a vehicle, it can suppress that the cyclic | annular clearance gap D changes.

  FIG. 14 shows another modification. This embodiment is basically the same as the above-described embodiment (FIG. 9) except that the structure of the metal ring 24 is different, and other parts and parts having the same parts or parts having the same functions are denoted by the same reference numerals. The detailed explanation is omitted.

  The metal ring 12 is formed in an arc shape corresponding to the cylindrical fitting portion 12a fitted on the shoulder portion 4e of the hub wheel 4 and the base portion 6b formed in an arc shape, as in the embodiment described above. A curved portion 12b, a disk portion 12c extending radially outward from the curved portion 12b and in close contact with the inner side surface 6c of the wheel mounting flange 6, and a wheel mounting from the outer diameter portion of the disk portion 12c. An umbrella portion 12d that is spaced apart from the flange 6 in the axial direction and extends in an inclined manner, and a bent portion 12e that protrudes radially outward from the umbrella portion 12d are provided.

  If the circular arc surface 25 having the curvature radius R0 with the bearing center O as the center is formed on the outer periphery of the outer end portion of the outer member 23 as in the present embodiment, the umbrella portion 12d of the metal ring 12 is formed. Even if it is not a circular arc surface but a straight shape, if the axle is tilted when the vehicle turns, the annular gap D is prevented from changing, and muddy water or the like enters the sliding contact portion between the seal 8 and the metal ring 12. Can be prevented.

  FIG. 15 shows another modification. This embodiment is basically the same as the above-described embodiment (FIG. 9) except that the structure of the metal ring 24 is different, and other parts and parts having the same parts or parts having the same functions are denoted by the same reference numerals. The detailed explanation is omitted.

  The metal ring 24 ″ includes a cylindrical fitting portion 12a that is externally fitted to the shoulder portion 4e of the hub wheel 4, a curved portion 12b that is formed in an arc shape corresponding to the base portion 6b that is formed in an arc shape, A disc portion 12c that extends radially outward from the curved portion 12b and is in close contact with the side surface 6c on the inner side of the wheel mounting flange 6, and a shaft with respect to the wheel mounting flange 6 from the outer diameter portion of the disc portion 12c. An umbrella portion 24a ′ made of a predetermined arc surface and spaced apart in the direction is provided, and a bent portion 12e formed to protrude radially outward from the umbrella portion 24a ′.

  Here, on the outer periphery of the outer end portion of the outer member 23, an arc surface 25 having a radius of curvature R0 with the bearing center O as the center is formed, and the umbrella portion 24a ′ of the metal ring 24 ″ is formed at the bearing center O. It is formed with a radius of curvature R3 centered on a position slightly shifted to the outer side, and a slight annular gap D ′ is formed between the umbrella portion 24a ′ and the arcuate surface 25, and the nozzle-like shape It constitutes a labyrinth.

  In this way, a slight annular gap D ′ is formed between the umbrella portion 24a ′ of the metal ring 24 ″ and the arc surface 25 of the outer member 23 to form a nozzle-like labyrinth. Even if muddy water or the like enters the sliding contact portion between the seal 8 and the metal ring 24 ″, it is easily discharged to the outside by the centrifugal force accompanying the rotation of the metal ring 24 ″ and does not stay on the side lip 14a. Therefore, muddy water or the like can be prevented from adhering to the sliding contact surface of the side lip 14a and being worn, and a stable sealing performance can be maintained over a long period of time.

  FIG. 16 shows another modification. In this embodiment, basically only the configuration of a part of the outer member 23 of the above-described embodiment (FIG. 9) is different, and the same reference numerals are given to the same parts or parts having the same function. Detailed description will be omitted.

  The metal ring 24 includes a cylindrical fitting portion 12a that is fitted on the shoulder portion 4e of the hub wheel 4, a curved portion 12b that is formed in an arc shape corresponding to the base portion 6b that is formed in an arc shape, A disc portion 12c that extends radially outward from the curved portion 12b and is in close contact with the inner side surface 6c of the wheel mounting flange 6, and an axial direction from the outer diameter portion of the disc portion 12c to the wheel mounting flange 6 And an umbrella portion 24a having a predetermined arc surface, and a bent portion 12e formed to protrude radially outward from the umbrella portion 24a.

  Here, an arc surface 25 having a radius of curvature R0 with the bearing center O as the center is formed on the outer periphery of the outer end portion of the outer member 23 ′, and an annular groove 29 is formed in the vicinity of the arc surface 25. Has been. As a result, muddy water or the like that has traveled on the outer peripheral surface of the outer member 23 ′ flows and is discharged to the lower part (road surface side) along the bowl-shaped annular groove 29, thereby preventing intrusion into the labyrinth. The muddy water or the like can be prevented from entering the sliding contact portion between the seal 8 and the metal ring 24.

  FIG. 17 shows another modification. This embodiment is basically the same as the above-described embodiment (FIG. 9) except that the structure of the metal ring 24 is different, and other parts and parts having the same parts or parts having the same functions are denoted by the same reference numerals. The detailed explanation is omitted.

  The metal ring 24 includes a cylindrical fitting portion 12a that is fitted on the shoulder portion 4e of the hub wheel 4, a curved portion 12b that is formed in an arc shape corresponding to the base portion 6b that is formed in an arc shape, A disc portion 12c that extends radially outward from the curved portion 12b and is in close contact with the inner side surface 6c of the wheel mounting flange 6, and an axial direction from the outer diameter portion of the disc portion 12c to the wheel mounting flange 6 And an umbrella portion 24a having a predetermined arc surface, and a bent portion 12e formed to protrude radially outward from the umbrella portion 24a.

  Here, on the outer periphery of the outer end portion of the outer member 23 ″, an arcuate surface 25 ′ having a radius of curvature R4 with a position slightly shifted to the inner side from the bearing center O is formed, and a metal ring 24 umbrella parts 24a are formed with a radius of curvature R1 centered on the bearing center O. A slight annular gap D 'is formed between the umbrella part 24a and the arcuate surface 25', and the nozzle-like It constitutes a labyrinth.

  Thus, since a slight annular gap D ′ is formed between the umbrella portion 24a of the metal ring 24 and the circular arc surface 25 ′ of the outer member 23 ″ to constitute a nozzle-like labyrinth, Even if muddy water or the like enters the sliding contact portion between the seal 8 and the metal ring 24, it is easily discharged to the outside by the centrifugal force accompanying the rotation of the metal ring 24 and does not stay on the side lip 14a.

  FIG. 18 shows another modification. This embodiment is basically the same as the above-described embodiment (FIG. 9) except that the structure of the metal ring 24 is different, and other parts and parts having the same parts or parts having the same functions are denoted by the same reference numerals. The detailed explanation is omitted.

  The metal ring 12 is formed in an arc shape corresponding to the cylindrical fitting portion 12a fitted on the shoulder portion 4e of the hub wheel 4 and the base portion 6b formed in an arc shape, as in the embodiment described above. A curved portion 12b, a disk portion 12c extending radially outward from the curved portion 12b and in close contact with the inner side surface 6c of the wheel mounting flange 6, and a wheel mounting from the outer diameter portion of the disk portion 12c. An umbrella portion 12d that is spaced apart from the flange 6 in the axial direction and extends in an inclined manner, and a bent portion 12e that protrudes radially outward from the umbrella portion 12d are provided.

  A seal member 17 made of synthetic rubber or the like is integrally joined to the bent portion 12e of the metal ring 12 by vulcanization adhesion. The seal member 17 extends inward in the radial direction, and integrally includes a seal lip 17 a that is in sliding contact with the arcuate surface 25 of the outer member 2.

  As described above, the seal lip 17a of the seal member 17 joined to the metal ring 12 is in sliding contact with the circular arc surface 25 of the outer member 2, so that the seal lip 17a can be obtained even when the axle is tilted when the vehicle turns. Therefore, it is possible to prevent muddy water or the like from entering the sliding contact portion between the seal 8 and the metal ring 12.

  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 second to fourth generation wheel bearing devices of the inner ring rotation type.

DESCRIPTION OF SYMBOLS 1 Inner member 2, 23, 23 ', 23 "Outer member 2a Outer rolling surface 2b Car body mounting flange 3 Rolling body 4 Hub wheel 4a, 5a Inner rolling surface 4b Small diameter step part 4c Serration 4d Clamping part 4e Shoulder Part 5 Inner ring 6 Wheel mounting flange 6a Hub bolt 6b Base part 6c on the inner side of the wheel mounting flange Side surface 7 on the inner side of the wheel mounting flange Cage 8 Seal on the outer side 9 Seal on the inner side 10 Seal plate 11 Slinger 12, 12 ', 24, 24 ', 24 "Metal ring 12a Fitting portion 12b Curved portion 12c Disk portion 12d, 24a, 24a' Umbrella portion 12e Bending portion 13 Core 14 Seal member 14a, 14b Side lip 14c Grease lip 15 Elastic member 16 Tapered surfaces 17, 18, 19, 20, 21 Seal members 17a, 19a, 20a, 21a Seal lip 22 Grease 25 25 'Arc surface 26, 27, 28 Cover member 29 Annular groove 102 Outer member 102c Tapered surface 104 Hub wheel 106 Wheel mounting flange 106b Wheel mounting flange base 106c Wheel mounting flange side surface 108 Seal 112 Metal ring 112a Fitting portion 112b Curved part 112c Disk part 112d Umbrella part 112e Bent part 113 Core metal 114 Seal member 114a, 114b Side lip 114c Grease lip A, C, D, D ′ Annular gap O Bearing center R Curvature of metal ring curved part Radius R0, R4 Arc surface curvature radius R1, R2, R3 Umbrella curvature radius r Base radius of curvature θ1, θ3 Inclination angle of taper surface θ2, θ4 Inclination angle of umbrella

Claims (8)

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 wheel that has a wheel mounting flange for mounting a wheel at one end and a small-diameter step on the outer periphery, and an outer ring member of an inner ring or constant velocity universal joint that is 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;
A seal mounted on both side openings of an annular space formed between the outer member and the inner member;
The base portion on the inner side of the wheel mounting flange is formed in an arc shape, and a metal ring formed by pressing from a steel plate is fitted to the base portion,
Outer side seal among the seals is a core metal fitted to the inner periphery of the end portion of the outer member, and a side that is integrally joined to the core metal by vulcanization adhesion and extends obliquely outward in the radial direction. In the wheel bearing device, comprising a seal member having a lip and a grease lip extending inclinedly toward the bearing inward side, and the side lip of the seal member is in sliding contact with the metal ring,
A cylindrical fitting portion in which the metal ring is fitted on the shoulder portion of the hub wheel, a curved portion formed in an arc shape corresponding to the shape of the base portion, and a radially outward direction from the curved portion A disc portion mounted on the inner side surface of the wheel mounting flange, and an axially spaced from the outer diameter portion of the disc portion to the wheel mounting flange and inclined radially outward. And a sealing member integrally joined to the tip of the umbrella portion by vulcanization adhesion, and the sealing member integrally has a sealing lip extending inwardly in the radial direction. A wheel bearing device characterized by being in sliding contact with the outer periphery of the end of the side member.   A tapered surface having a predetermined arc surface or a predetermined inclination angle is formed on the outer periphery of the outer side end portion of the outer member, and a bent portion is formed by projecting radially outward from the tip of the umbrella portion. The wheel bearing device according to claim 1, wherein the seal member is joined to the bent portion, and the seal lip is slidably contacted with an arc surface or a tapered surface of the outer member.   The wheel bearing device according to claim 1, wherein the metal ring seal member is joined so as to cover an exposed outer surface.   In addition to the seal lip, the seal member of the metal ring integrally includes a seal lip extending inwardly in the radial direction on the inner diameter side of the seal lip and in sliding contact with the outer member. Item 4. The wheel bearing device according to any one of Items 1 to 3.   The wheel bearing device according to claim 1, wherein grease is preliminarily applied to a seal lip of the metal ring.   A predetermined arc surface is formed on the outer periphery of the outer end of the outer member, and the arc surface is formed with a radius of curvature centered on the bearing center O and slightly between the umbrella portion of the metal ring. The wheel bearing device according to claim 1, wherein a labyrinth is formed by forming an annular gap.   A base portion on the inner side of the wheel mounting flange is formed on an arc surface having a predetermined radius of curvature r, and a curved portion of the metal ring is formed on an arc surface having a predetermined radius of curvature R corresponding to the arc surface. The wheel bearing device according to claim 1, wherein the curvature radii R and r are set such that R ≧ r.   The wheel bearing according to claim 1, wherein the elastic member is integrally joined by vulcanization bonding from the disk portion of the metal ring to the umbrella portion, and elastically contacts the inner side surface of the wheel mounting flange. apparatus.

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