JP5328136B2 - Wheel bearing - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a bearing for a wheel capable of improving muddy water resistant performance without increasing weight. <P>SOLUTION: This bearing for the wheel has a bearing sealing device on both ends between an inner member and an outer member relatively rotating via a rolling element. The bearing sealing device is composed of opposed annular seal plate 2 and elastic seal member 3. The seal plate 2 is composed of a cylindrical part 2a suitable for the outer periphery of the inner member and a vertical plate part 2b rising from its end part. The elastic seal member 3 is formed by fixing an elastic body 5 to core metal 4. The core metal 4 has a cylindrical part 4a suitable for the inner periphery of the outer member and a vertical plate part 4b let down from its end part, and is opposed to the seal plate 2. The elastic body 5 has two side lips 5a and 5b contacting with the vertical plate part 2b of the seal plate 2 in the radial direction of the core metal 4, and two radial lips 5c and 5d contacting with or approaching an outer peripheral surface of the seal plate 2 in the radial direction. The length in the radial direction up to an outer diameter surface of the elastic seal member 3 from an inner diameter surface of the seal plate 2, is set to 9-15 mm. <P>COPYRIGHT: (C)2009,JPO&amp;INPIT

Description

  The present invention relates to a wheel bearing in an automobile or the like that rotatably supports a wheel with respect to a vehicle body.

A vehicle such as a truck has a longer travel distance within a life cycle period than a passenger car, and travels 1 million km or more. In the case of such a vehicle, it is desired not only to improve the life of the wheel bearing mounted on the vehicle, but also to improve the life of the seal performance of the bearing sealing device provided at the end of the bearing space of the wheel bearing. Therefore, as this type of bearing sealing device, as shown in FIG. 12, with respect to a sealing plate 82 having an L-shaped cross section attached to the bearing inner ring and a standing plate portion 82b rising on the outer diameter side of the sealing plate 82, It has two side lips 83a and 83b that are slidably in contact with each other in the radial direction, and is composed of an elastic seal member 83 with a cored bar that is attached to the bearing outer ring. (For example, Patent Document 1).
JP 2007-9938 A

  As described above, when the two side lips 83a and 83b are provided in the bearing sealing device, the anti-muddy water performance is increased about twice as compared with the conventional general bearing sealing device. In such a case, further muddy water resistance is required.

  An object of the present invention is to provide a wheel bearing capable of improving muddy water resistance without causing an increase in weight.

The wheel bearing according to the present invention has an outer member and an inner member that rotate relative to each other via double row rolling elements, and a bearing sealing device at both ends of a bearing space between the outer member and the inner member. And a bearing sealing device provided at one or both of the inboard side end and the outboard side end in the bearing space, the wheel bearing supporting the wheel with respect to the vehicle body. An annular seal plate and an elastic seal member, which are respectively attached to the side members and face each other, are made up of a cylindrical portion fitted to the outer periphery of the inner member and an upright standing up from an end portion of the cylindrical portion. It is made of a metal having an L-shaped cross section composed of a plate portion, and the elastic seal member is composed of an annular cored bar and an elastic body fixed to the cored bar, and the cored bar is formed on the inner peripheral surface of the outer member. Mating cylinder And an L-shaped cross section having a standing plate portion that falls from an end portion of the cylindrical portion and facing the seal plate, and the elastic bodies are aligned with each other in the radial direction of the cored bar, and the tips thereof are the seals Two side lips that are in contact with the vertical plate portion of the plate, and two radial lips that are arranged in the axial direction and whose tip is in contact with or close to the outer peripheral surface of the seal plate,
Each of the two side lips and the two radial lips extends independently from a covering portion that covers the standing plate portion of the cored bar in the elastic body,
The two side lips extend from the standing plate portion of the core metal to the oblique outer diameter side through the covering portion,
The two radial lips extend from the tip of the vertical plate portion of the core metal through the cover portion, and the radial lip on the vertical plate portion side of the seal plate is the seal lip of the two radial lips. Extends diagonally to the inner diameter side toward the vertical plate part side of the plate,
It is characterized by that.
According to this structure, since it has two side lips which contact | connect the standing board part of a sealing plate, and two radial lips which a front-end | tip contacts or adjoins to the outer peripheral surface of a sealing plate, the outstanding muddy water resistance performance is obtained. . When the sealing device cross-sectional height, which is the radial length from the inner diameter surface of the sealing plate in the sealing device to the outer diameter surface of the elastic seal member, is 9 to 15 mm, the weight increases. The muddy water resistance can be improved. If the cross-sectional height of the sealing device is lower than 9 mm, the bearing sealing device having the structure having the two side lips and the two radial lips cannot be realized, and if it is higher than 15 mm, the radial dimension of the wheel bearing is increased. This is not preferable because it increases the weight of the wheel bearing.

In the present invention, one of the two radial lips may be provided with a ring-shaped spring member for biasing the diameter.
As described above, in the configuration in which the radial lip is provided with the ring-shaped spring member that urges the diameter of the radial lip, the radial lip contact with the cylindrical portion of the seal plate is strengthened, and the radial due to the eccentricity when the bearing is mounted on the vehicle Since the followability of the lip is increased, the sealing effect by the radial lip can be further enhanced.

In the present invention, the radial lip far from the standing plate portion of the seal plate of the two radial lips may extend obliquely toward the inner diameter side to the opposite side of the standing plate portion of the seal plate.

  In this invention, the wheel bearing may be a double row tapered roller bearing type. For example, a wheel bearing for a truck or the like may be used.

  In the present invention, the wheel bearing may be a double row ball bearing type. For example, a wheel bearing for a general passenger car may be used.

  In this invention, the outer member may have a flange for wheel attachment or attachment to the vehicle body on the outer periphery. That is, the second generation type and the third and fourth generation type wheel bearings may be used.

  In the present invention, the inner member includes a hub wheel having a hub flange for mounting a wheel and a shaft portion, and an inner ring fitted to an outer periphery of an inboard side end of the shaft portion of the hub wheel. In addition, the inner ring may have rolling surfaces of each row on which the rolling elements roll. That is, it may be a third generation type wheel bearing.

  In this invention, the inner member includes a hub wheel having a hub flange and a shaft portion for wheel attachment, and an outer joint member of a constant velocity universal joint, and a stem portion of the outer joint member is coupled to the hub wheel. In addition, the hub wheel and the outer joint member may have rolling surfaces of each row on which the rolling elements roll. That is, it may be a fourth generation type wheel bearing.

The wheel bearing according to the present invention has an outer member and an inner member that rotate relative to each other via double row rolling elements, and a bearing sealing device at both ends of a bearing space between the outer member and the inner member. And a bearing sealing device provided at one or both of the inboard side end and the outboard side end in the bearing space, the wheel bearing supporting the wheel with respect to the vehicle body. An annular seal plate and an elastic seal member, which are respectively attached to the side members and face each other, are made up of a cylindrical portion fitted to the outer periphery of the inner member and an upright standing up from an end portion of the cylindrical portion. It is made of a metal having an L-shaped cross section composed of a plate portion, and the elastic seal member is composed of an annular cored bar and an elastic body fixed to the cored bar, and the cored bar is formed on the inner peripheral surface of the outer member. Mating cylinder And an L-shaped cross section having a standing plate portion that falls from an end portion of the cylindrical portion and facing the seal plate, and the elastic bodies are aligned with each other in the radial direction of the cored bar, and the tips thereof are the seals possess the two side lip in contact with the upright plate portion of the plate, and two radial lip tip in the axial direction on the outer peripheral surface of the arrangement the sealing plate is in contact with or close, the two side lips and the 2 Each of the radial lips of the sheet extends independently from a cover portion of the elastic body that covers the standing plate portion of the core metal, and the two side lips extend from the standing plate portion of the core metal. The two radial lips extend from the tip of the upright plate portion of the core metal through the cover portion, and the seal of the two radial lips is the seal. L on the vertical plate side of the plate Arurippu can improve the muddy water performance without incurring fit, the weight gain which extends obliquely inside diameter side to the standing portion side of the seal plate.

An embodiment of the present invention will be described with reference to FIGS. This embodiment is applied to a double row tapered roller bearing type wheel bearing classified as a first generation type. In this specification, the side closer to the outer side in the vehicle width direction of the vehicle when attached to the vehicle is referred to as the outboard side, and the side closer to the center of the vehicle is referred to as the inboard side.
The wheel bearing 20 includes an outer member 21 and an inner member 22 that rotate relative to each other via double row rolling elements 23, and rotatably supports the wheel with respect to the vehicle body. . The rolling element 23 is formed of a tapered roller, and is formed on the inner periphery of the outer member 21. Double row conical rolling surfaces 24 adjacent to each other on the small diameter side, and the inner members facing the rolling surfaces 24 respectively. It is interposed between double-row conical rolling surfaces 25 formed on the outer periphery of 22. The inner member 22 is a split inner ring in which two bearing inner rings 22A are arranged in the axial direction. The rolling elements 23 are held by a holder 26 for each row. Here, the outer member 21 is a fixed member, and the inner member 22 is a rotating member. Both ends of the bearing space between the outer member 21 and the inner member 22 are sealed by bearing sealing devices 1 and 11, respectively.

As shown in FIG. 2, the bearing sealing device 1 provided at the inboard side end of the wheel bearing 20 is attached to the inner member 22 and the outer member 21, respectively, and the annular seal plate 2 and the elastic member facing each other. It consists of a seal member 3. The seal plate 2 is a member that becomes a slinger, and is a metal having an L-shaped cross section that includes a cylindrical portion 2a that fits to the outer peripheral surface of the inner member 22 and a standing plate portion 2b that rises from an end of the cylindrical portion 2a. It is made. The elastic seal member 3 is obtained by fixing an elastic body 5 to an annular cored bar 4. The core metal 4 has a cylindrical portion 4a fitted to the inner peripheral surface of the outer member 21, and a standing plate portion 4b that falls from the end of the cylindrical portion 4a, and is opposed to the seal plate 2 in the axial direction. The cross section has an inverted L shape. The elastic body 5 is provided so as to cover the inner side of the cored bar 4, and has two side lips 5a and 5b and two radial lips 5c and 5d. The two side lips 5a and 5b are arranged side by side in the radial direction of the cored bar 4, extend from the standing plate part 4b of the cored bar 4 to the oblique outer diameter side, and the tip of each of the side plates 5a and 5b of the seal plate 2 It contacts the upright plate portion 2b. The side lips 5a and 5b are for preventing muddy water from entering from the outside. One radial lip 5c is also for preventing muddy water intrusion, and extends from the tip of the standing plate portion 4b of the cored bar 4 toward the standing plate portion 2b side of the sealing plate 2 toward the inner diameter side, and the tip is a cylinder of the sealing plate 2 It contacts the part 2a. Another radial lip 5d is for preventing grease leakage, and extends from the tip of the upright plate portion 4b of the core metal 4 to the side opposite to the upright plate portion 2b of the seal plate 2 toward the oblique inner diameter side, and the tip is the seal plate. that Sessu to 2 of the cylindrical portion 2a. The side lips 5a and 5b and the radial lips 5c and 5d extend from the cored bar 4 through a covering part 5e that covers the upright part 4b of the cored bar 4 in the elastic body 5, specifically. From the inner diameter surface of the sheet Lumpur plate 2, the sealing device section height H radial in length to the outer diameter surface of the elastic sealing member 3 is a 9～15Mm.

  Thus, in the wheel bearing 20 having the above-described configuration, the sealing device cross-sectional height H in the bearing sealing device 1 provided at the inboard side end of the bearing space is set to 9 to 15 mm, so that the muddy water resistance is improved. Can do. If the sealing device cross-sectional height H is lower than 9 mm, the bearing sealing device 1 having the structure having the two side lips 5a and 5b and the two radial lips 5c and 5d does not hold. This is not preferable because the radial dimension of 20 increases and the weight of the wheel bearing 20 increases. That is, according to the wheel bearing device 20, the muddy water resistance can be improved without causing an increase in weight. 1, only the inboard side end of the bearing space is sealed with the bearing sealing device 1 having the structure of FIG. 2, but the outboard side end of the bearing space is also sealed with the same bearing sealing device 1. It may be sealed. In general, in the wheel bearing, the inboard side end is a place where the muddy water or the like is easily applied, but the outboard side end is difficult to receive the muddy water or the like. It ’s enough.

  FIG. 3 shows another configuration example of the bearing sealing device 1. In this configuration example, in the configuration example of FIG. 2, of the two radial lips 5 c and 5 d, one radial lip 5 c extending toward the standing plate portion 2 b side of the seal plate 2 is ring-shaped spring that biases the diameter of the ring spring. A member 6 is provided. A garter spring or the like is used for the ring-shaped spring member 6. Other configurations are the same as those in the configuration example of FIG. FIG. 6 shows an example in which the bearing sealing device 1 at the inboard side end in the wheel bearing 20 of FIG. 1 is replaced with the configuration example of FIG.

  As described above, in the configuration in which the radial lip 5c is provided with the ring-shaped spring member 6 that urges the diameter of the radial lip 5c, the radial lip 5c contacts the cylindrical portion 2a of the seal plate 2 and the bearing is attached to the vehicle. Since the lip followability of the radial lip 5c due to the eccentricity of is increased, the effect of preventing the muddy water from entering by the radial lip 5c is further enhanced.

FIG. 4 shows a configuration example of a bearing sealing device according to a proposed example different from the present invention . In this configuration example, in the configuration example of FIG. 2, the side lip 5b on the inner diameter side of the two side lips 5a and 5b is replaced with the upright plate portion 2b of the seal plate 2 of the two radial lips 5c and 5d. It is formed so as to extend from the tip of one radial lip 5c extending to the side to constitute an integral seal lip. Other configurations are the same as those in the configuration example of FIG.

  In this way, when the side lip 5b on the inner diameter side is formed to extend from the tip of the radial lip 5c so as to constitute an integral seal lip, the seal lip structure of the bearing sealing device 1 can be simplified. It becomes easy to suppress the apparatus cross-sectional height H to 15 mm or less.

FIG. 5 shows another configuration example of a bearing sealing device which is a proposed example different from the present invention . In this configuration example, in the configuration example of FIG. 4, a ring-shaped spring member 6 that biases the diameter is provided on a seal lip in which the side lip 5 b and the radial lip 5 c are integrated. Other configurations are the same as those in the configuration example of FIG.

  In this way, the side lip 5b on the inner diameter side is formed so as to form an integral seal lip extending from the tip of the radial lip 5c, and the ring-shaped spring member 6 is provided to reduce the diameter of the integral seal lip. In this case, the seal lip structure of the bearing sealing device 1 can be simplified, and the sealing device cross-sectional height H can be easily suppressed to 15 mm or less, and the seal plate 2 can be connected to the standing plate portion 2b and the cylindrical portion 2a. The contact between the side lip 5b and the radial lip 5c is strengthened, and the lip following ability of the radial lip 5c due to the eccentricity when the bearing is attached to the vehicle is increased, so that the muddy water intrusion preventing effect is further enhanced.

  FIG. 7 shows another embodiment of the wheel bearing. The wheel bearing 30 is a double row outward angular ball bearing type classified as a first generation type. That is, the wheel bearing 30 is obtained by replacing the rolling elements 23 in the wheel bearing 20 shown in FIG. 1 with balls, and both ends of an annular space formed between the inner and outer members 22 and 21 are sealed with a pair of bearings. It is sealed with devices 1 and 1. Here, as the bearing sealing device 1 on the inboard side and the outboard side, the configuration example of FIG. 2 is used. The inner member 22 is also composed of a split inner ring in which two bearing inner rings 22A are arranged in the axial direction, as in the embodiment of FIG.

  FIG. 8 shows still another embodiment of the wheel bearing. The wheel bearing 40 is a double-row outward angular ball bearing type classified as a second generation type, and is an outer ring rotating type and a driven wheel supporting type. The wheel bearing 40 includes a hub wheel outer member 41 having double-row rolling surfaces 44 on the inner periphery, and an inner member 42 having rolling surfaces 45 respectively facing the rolling surfaces 44. A double row rolling element 43 interposed between the double row rolling surfaces 44 and 45 is provided. The outer member 41 has a hub flange 41a for wheel attachment on the outer periphery. A wheel (not shown) is attached to the hub flange 41a with a hub bolt 37 via a brake rotor. The inner member 42 includes a split inner ring in which two bearing inner rings 42A and 42A each having a rolling surface 45 are arranged in the axial direction. An axle (not shown) is fixed to the inner diameter surface of the inner member 42. The rolling element 43 is formed of a ball and is held by a holder 46 for each row. Both ends of the annular space formed between the inner and outer members 42 and 41 are sealed with a pair of bearing sealing devices 1 and 12. 2 is used as the bearing sealing device 1 on the inboard side.

  FIG. 9 shows still another embodiment of the wheel bearing. The wheel bearing 50 is a double-row tapered roller bearing type classified as a second generation type, and is an inner ring rotating type and for driving wheel support. The wheel bearing 50 includes an outer member 51 having double-row rolling surfaces 54 on the inner periphery, an inner member 52 having rolling surfaces 55 respectively facing the rolling surfaces 54, and the double-row rolling members 54. And a double row rolling element 53 interposed between the rolling surfaces 54 and 55. The rolling element 53 is formed of a tapered roller and is held by a cage 56 for each row. The outer member 51 is a member on the fixed side, and has a flange 51a attached to a knuckle (not shown) constituting the suspension device of the vehicle body on the outer periphery, and the whole is an integral part. The inner member 52 is a member on the rotation side, and includes a hub ring 57 and a pair of split inner rings 58A and 58B fitted to the outer periphery thereof. The inner rings 58A and 58B are arranged in each row. A rolling surface 55 is formed. The hub wheel 57 has a hub flange 57a for wheel attachment on the outer periphery. A wheel (not shown) is attached to the hub flange 57a with a hub bolt 37 via a brake rotor. The inboard side end of the shaft portion 57b of the hub wheel 57 is a crimping portion 57c, and this crimping portion 57c is pressed against the width surface of the inner ring 58B. The hub wheel 57 has a central hole 59, and an outer joint member of a constant velocity universal joint (not shown) on the outboard side is connected to the central hole 59 by spline fitting. Both ends of the annular space formed between the inner and outer members 52 and 51 are sealed with the bearing sealing device 1 having the configuration example of FIG.

  FIG. 10 shows still another embodiment of the wheel bearing. This wheel bearing 60 is a double-row outward angular contact ball bearing type classified as a third generation type, and is an inner ring rotating type and for driving wheel support. The wheel bearing 60 includes an outer member 61 having double-row rolling surfaces 64 on the inner periphery, an inner member 62 having rolling surfaces 65 respectively opposed to the rolling surfaces 64, and the double-rows. And a double row rolling element 63 interposed between the rolling surfaces 64 and 65. The outer member 61 is a member on the fixed side, and has a flange 61a attached to the knuckle in the suspension device (not shown) of the vehicle body on the outer periphery, and the whole is an integral part. The inner member 62 is a member on the rotation side, and is fitted to the outer periphery of the hub wheel 67 having a hub flange 67a for wheel attachment on the outer periphery and the inboard side end of the shaft portion 67b of the hub wheel 67. And the inner ring 68. The hub wheel 67 and the inner ring 68 are formed with the rolling surfaces 65 of each row. The rolling element 63 is made of a ball and is held by a holder 66 for each row. Both ends of the annular space formed between the inner and outer members 62 and 61 are sealed with a pair of bearing sealing devices 1 and 13. 2 is used as the bearing sealing device 1 on the inboard side.

  In assembling the wheel bearing 60 to the vehicle, the stem portion 16a of the outer joint member 16 of the constant velocity universal joint is inserted into the through hole 17 of the hub wheel 67, and the outer peripheral surface of the stem portion 16a and the through hole 17 are inserted. The outer joint member 16 is coupled to the inner member 62 by a spline fitting with the inner peripheral surface and tightening of a nut 18 screwed into the tip of the stem portion 16a. At this time, the cross section 16b on the outboard side provided in the outer joint member 16 is pressed against the end surface 68a facing the inboard side of the inner ring 68, and the inner member 62 is tightened by the outer joint member 16 and the nut 18. The The wheel mounting hub flange 67a is located at the end of the hub wheel 67 on the outboard side, and a wheel (not shown) is attached to the hub flange 67a with a hub bolt 37 via a brake rotor.

  FIG. 11 shows still another embodiment of the wheel bearing. This wheel bearing 70 is a double-row outward angular contact ball bearing type classified as a fourth generation type, and is an inner ring rotating type and supporting a driving wheel. The wheel bearing 70 includes an outer member 71 having double-row rolling surfaces 74 on the inner periphery, an inner member 72 having rolling surfaces 75 respectively facing the rolling surfaces 74, and the double-rows. And a double row rolling element 73 interposed between the rolling surfaces 74 and 75. The rolling element 73 is made of a ball and is held by a holder 76 for each row. Both ends of the annular space formed between the inner and outer members 72 and 71 are sealed with a pair of bearing sealing devices 1 and 14. 2 is used as the bearing sealing device 1 on the inboard side.

  The outer member 71 is a member on the fixed side, and has a flange 71a attached to the knuckle in the suspension device (not shown) of the vehicle body on the outer periphery, and the whole is an integral part. The inward member 72 is a member on the rotation side, and a hub ring 77 having a hub flange 77a for wheel attachment on the outer periphery of the shaft part 77b, and a stem part 78a is inserted into the center hole 79 of the hub ring 77. And the outer joint member 78 of the constant velocity universal joint 90 to be fitted. The hub wheel 77 and the outer joint member 78 are formed with the rolling surfaces 75 of each row. A wheel (not shown) is attached to the hub flange 77a of the hub wheel 77 with a hub bolt 37 via a brake rotor. The constant velocity universal joint 90 includes a plurality of axial grooves 95 formed on the spherical inner surface of the cup-shaped portion 78b of the outer joint member 78, and a plurality of axial grooves 92 provided on the spherical outer surface of the inner joint member 91. Between them, a torque transmission ball 93 is interposed, and a retainer 94 for holding the torque transmission ball 93 is provided.

It is sectional drawing of the wheel bearing concerning one Embodiment of this invention. It is sectional drawing of the example of 1 structure of the bearing sealing device provided in the bearing for the wheels. It is sectional drawing of the other structural example of the same bearing sealing apparatus. It is sectional drawing of the structural example of the bearing sealing apparatus which concerns on the proposal example different from this invention . The present invention is a cross-sectional view of a usage scenario of the bearing sealing device according to different other suggestions example. It is sectional drawing which shows the example which provided the bearing sealing device of FIG. 3 in the wheel bearing of FIG. It is sectional drawing of the wheel bearing concerning other embodiment of this invention. It is sectional drawing of the wheel bearing concerning other embodiment of this invention. It is sectional drawing of the wheel bearing concerning other embodiment of this invention. It is sectional drawing of the wheel bearing concerning other embodiment of this invention. It is sectional drawing of the wheel bearing concerning other embodiment of this invention. It is sectional drawing of the conventional bearing sealing device.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 ... Bearing sealing apparatus 2 ... Seal plate 2a ... Cylindrical part 2b ... Standing plate part 3 ... Elastic seal member 4 ... Core metal 4a ... Cylindrical part 4b ... Standing plate part 5 ... Elastic body 5a, 5b ... Side lip 5c, 5d ... Radial lip 6 ... ring-shaped spring members 20 to 70 ... wheel bearings 21, 41, 51, 61, 71 ... outer members 22, 42, 52, 62, 72 ... inner members 23, 43, 53, 63, 73 ... rolling elements 41a, 57a, 67a, 77a ... hub flanges 51a, 61a, 71a ... wheel mounting flanges 57, 67, 77 ... hub wheels 57b, 67b, 77b ... hub wheel shafts 24, 44, 54, 64 74 ... Rolling surfaces 25, 45, 55, 65, 75 ... Outer member rolling surfaces 16, 78 ... Constant velocity universal joint outer joint members 16a, 78a ... Outer joint member stem portion

Claims (9)

It has an outer member and an inner member that rotate relative to each other via double row rolling elements, and has bearing sealing devices at both ends of the bearing space between the outer member and the inner member. In the wheel bearing that supports the wheel,
An annular seal plate and an elastic seal, which are respectively attached to the inner member and the outer member and face each other, with a bearing sealing device provided at one or both of the inboard side end and the outboard side end in the bearing space. It shall consist of members,
The seal plate is made of a metal having an L-shaped cross section composed of a cylindrical portion fitted to the outer periphery of the inner member and a standing plate portion rising from an end portion of the cylindrical portion,
The elastic seal member is composed of an annular cored bar and an elastic body fixed to the cored bar,
The cored bar has a cylindrical portion that fits to the inner peripheral surface of the outer member and a standing plate portion that falls from an end portion of the cylindrical portion, and has an L-shaped cross section facing the seal plate,
The elastic bodies are aligned with each other in the radial direction of the cored bar, the two side lips whose tips are in contact with the standing plate portion of the seal plate, and the tips are in contact with the outer peripheral surface of the seal plate aligned in the axial direction. have a and two radial lip in close proximity,
Each of the two side lips and the two radial lips extends independently from a covering portion that covers the standing plate portion of the cored bar in the elastic body,
The two side lips extend from the standing plate portion of the core metal to the oblique outer diameter side through the covering portion,
The two radial lips extend from the tip of the vertical plate portion of the core metal through the cover portion, and the radial lip on the vertical plate portion side of the seal plate is the seal lip of the two radial lips. Extends diagonally to the inner diameter side toward the vertical plate part side of the plate,
Wheel bearing which is characterized a call.   The wheel bearing according to claim 1, wherein one of the two radial lips is provided with a ring-shaped spring member that biases the diameter of the lip. 3. The wheel according to claim 1, wherein the radial lip far from the upright plate portion of the seal plate of the two radial lips extends toward the inner diameter side obliquely toward the opposite side of the upright plate portion of the seal plate. Bearings. The sealing device cross-sectional height according to any one of claims 1 to 3, wherein the sealing device cross-sectional height is a radial length from an inner diameter surface of the seal plate to an outer diameter surface of the elastic seal member in the bearing sealing device. 9-15mm wheel bearing.   The wheel bearing according to any one of claims 1 to 4, wherein the wheel bearing is a double row tapered roller bearing type.   The wheel bearing according to any one of claims 1 to 4, wherein the wheel bearing is a double row ball bearing type.   The wheel bearing according to any one of claims 1 to 6, wherein the outer member has a flange for wheel attachment or attachment to a vehicle body on an outer periphery.   7. The inner member according to claim 1, wherein the inner member is fitted to a hub wheel having a hub flange for attaching a wheel and a shaft portion, and an outer periphery of an inboard side end of the shaft portion of the hub wheel. A wheel bearing comprising a combined inner ring, and having a rolling surface of each row on which the rolling elements roll on the hub ring and the inner ring.   7. The outer joint according to claim 1, wherein the inner member includes a hub wheel having a hub flange for attaching a wheel and a shaft portion, and an outer joint member of a constant velocity universal joint. A wheel bearing in which a stem portion of a member is coupled to the hub wheel, and the hub wheel and the outer joint member have rolling surfaces of each row on which the rolling elements roll.

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