JP2022024884A - Hub unit bearing - Google Patents

Abstract

To realize a structure which can inhibit relative displacement between a hub and a slide contact ring.SOLUTION: A seal device 5 closes an axial outer opening of an internal space 21 existing between an inner peripheral surface of an outer ring 2 and an outer peripheral surface of a hub 3 and includes: a hub seal member 28 supported by the hub 3; and an outer ring seal member 29 supported by the outer ring 2. The hub seal member 28 has: an annular slide contact ring 30 fitted on the hub 3; and an elastic material 31 coupled to the slide contact ring 30. The elastic material 31 has a suction cup 37 which suctions an axial inner surface of a rotary flange 10. The outer ring seal member 29 has a seal lip 48b which is placed in slide contact with an axial inner surface of the slide contact ring 30.SELECTED DRAWING: Figure 2

Description

The present invention relates to a hub unit bearing that rotatably supports the wheels of an automobile with respect to a suspension device.

The hub unit bearing comprises an outer ring, a hub, and a plurality of rolling elements. The outer ring has a double-row outer ring track on the inner peripheral surface. The hub has a double-row inner ring track facing the double-row outer ring track on the outer peripheral surface, and has a rotary flange protruding radially outward from a portion located axially outside the outer ring. A plurality of rolling elements are arranged in each row between the outer ring orbits of the double rows and the inner ring orbits of the double rows. When assembled to the vehicle, the outer ring is supported by the suspension device and does not rotate. The hub rotates together with the wheels supported by the rotating flange and the rotating body for braking.

Regarding the hub unit bearing, the outside in the axial direction is the outside in the width direction of the vehicle when assembled to the vehicle, and the inside in the axial direction is the center side in the width direction of the vehicle when assembled to the vehicle.

The hub unit bearing further comprises a sealing device that closes the axially outer opening of the internal space that exists between the inner peripheral surface of the outer ring and the outer peripheral surface of the hub. Conventionally, as such a sealing device, a sealing ring having a plurality of sealing lips that are supported and fixed to the axially outer end of the outer ring and each tip is slidably contacted with the surface of the hub over the entire circumference has been used. Widely known.

However, the surface of the hub to which the tips of a plurality of seal lips are in sliding contact may have grinding lines formed by finish grinding using a full-type grindstone. If grinding lines are formed on the surface of the hub where the seal lip slides, the tip of the seal lip sticks to the surface of the hub and the seal torque increases, or the surface of the hub and the surface of the hub There is a possibility that an abnormal noise called seal squeal may occur at the sliding contact portion with the tip of the seal lip.

In order to solve the problem caused by the grinding streaks, for example, Japanese Patent Application Laid-Open No. 2016-089999 (Patent Document 1) describes a seal ring supported and fixed to the axially outer end of the outer ring, and an outer peripheral surface of the hub. Of these, a metal plate sliding contact ring that is externally fitted and fixed to a cylindrical surface existing between the rotary flange and the inner ring track of the outer row in the axial direction is provided, and the tips of a plurality of seal lips constituting the seal ring are provided. A sealing device that is slidably contacted with the surface of the sliding contact ring is described. In this sealing device, since the tips of a plurality of seal lips are in sliding contact with the surface of the sliding contact ring having good surface roughness, the sealing torque increases and noise is generated due to the sticking of the tips of the seal lips. Can be prevented.

Japanese Unexamined Patent Publication No. 2016-089999

The sealing device provided with the sliding contact ring as described above has room for improvement in terms of suppressing the relative displacement between the hub and the sliding contact ring. This point will be described below.

The hub unit bearing is composed of a rear combination type double row rolling bearing that supports a moment load based on the road surface reaction force, but it not only ensures durability (life) but also improves the steering stability of the vehicle. Therefore, high rigidity is required. Therefore, in the hub unit bearing, it is necessary to secure a long distance between rows of rolling elements arranged in multiple rows, and it is necessary to arrange the inner ring track of the outer row in the axial direction close to the rotating flange. Therefore, due to such circumstances, the axial dimension of the cylindrical surface portion existing between the rotating flange and the inner ring track of the axial outer row in the outer peripheral surface of the hub becomes smaller, and the cylindrical surface portion and the sliding contact ring become smaller. It is difficult to secure sufficient axial dimensions of the fitting portion.

Further, the corner R portion, which is a concave curved portion having an arcuate cross-sectional shape, existing at the connection portion between the axial inner surface of the rotary flange and the outer peripheral surface of the axial intermediate portion of the hub, is a moment based on the road surface reaction force. This is the part where stress tends to increase when bearing a load. Therefore, from the viewpoint of stress relaxation, it is necessary to secure a large radius of curvature of the corner R portion. From this surface as well, the axial dimension of the cylindrical surface portion existing between the rotating flange and the inner ring track of the axial outer row in the outer peripheral surface of the hub becomes smaller, and the fitting portion between this cylindrical surface portion and the sliding contact ring. It is difficult to secure sufficient axial dimensions.

If the axial dimension of the fitting portion between the outer peripheral surface of the hub and the sliding contact ring is small, slipping (creep) in the rotational direction is likely to occur in this fitting portion. In other words, relative displacement in the rotational direction is likely to occur between the hub and the sliding contact ring. Along with this, relative displacement in the axial direction is likely to occur between the hub and the sliding contact ring. As a result, the axial tightening allowance of the seal lip with respect to the surface of the sliding contact ring increases, and the sealing torque increases, or the axial tightening allowance of the seal lip with respect to the surface of the sliding contact ring decreases. Sealing performance may deteriorate.

In view of the above circumstances, it is an object of the present invention to realize a structure capable of suppressing the relative displacement between the hub and the sliding contact ring.

The hub unit bearing of the present invention includes an outer ring, a hub, a plurality of rolling elements, and a sealing device.
The outer ring has a double-row outer ring track on the inner peripheral surface.
The hub has a double-row inner ring track facing the double-row outer ring track on the outer peripheral surface, and has a rotary flange protruding radially outward at a portion located axially outside the outer ring.
A plurality of the rolling elements are arranged in each row between the outer ring orbits of the double row and the inner ring orbits of the double row.
The sealing device is a device for closing an axially outer opening of an internal space existing between an inner peripheral surface of the outer ring and an outer peripheral surface of the hub, and the hub sealing member supported by the hub and the outer ring. It has a supported outer ring sealing member.
The hub seal member has an annular sliding contact ring fitted to the hub and an elastic material coupled to the sliding contact ring.
The elastic material has a suction cup adsorbed on the inner side surface in the axial direction of the rotating flange.
The outer ring seal member has a seal lip that is slidably contacted with the inner side surface of the sliding contact ring in the axial direction.

In one aspect of the present invention, the sliding contact ring has an abutting portion abutted directly on the axial inner surface of the rotating flange or via a part of the elastic material.

In one aspect of the present invention, the elastic material has a gasket portion that elastically contacts the surface of the hub over the entire circumference.

According to the present invention, it is possible to suppress the relative displacement between the hub and the sliding contact ring, specifically, the rotational displacement (creep) and the axial displacement of the sliding contact ring with respect to the hub.

FIG. 1 is a cross-sectional view of a hub unit bearing of the first example of the embodiment. FIG. 2 is an enlarged view of part A of FIG. FIG. 3 is a view of a part of the elastic material in the circumferential direction as viewed from the outside in the axial direction with respect to the first example of the embodiment. FIG. 4 is a diagram corresponding to FIG. 2 with respect to the second example of the embodiment. FIG. 5 is a view of a part of the radial outer portion of the elastic material in the circumferential direction as viewed from the axial outer side with respect to the second example of the embodiment. FIG. 6 is a diagram corresponding to FIG. 2 with respect to the third example of the embodiment. FIG. 7 is a diagram corresponding to FIG. 2 with respect to the fourth example of the embodiment. FIG. 8 is a diagram corresponding to FIG. 2 with respect to the fifth example of the embodiment. FIG. 9 is a diagram corresponding to FIG. 2 with respect to the sixth example of the embodiment. FIG. 10 is a diagram corresponding to FIG. 2 with respect to the seventh example of the embodiment. FIG. 11 is a diagram corresponding to FIG. 2 with respect to the eighth example of the embodiment. FIG. 12 is a diagram corresponding to FIG. 2 with respect to the ninth example of the embodiment. FIG. 13 is a diagram corresponding to FIG. 2 with respect to the tenth example of the embodiment.

[First example of the embodiment]
A first example of the embodiment of the present invention will be described with reference to FIGS. 1 to 3.

The hub unit bearing 1 of this example is for a drive wheel, and includes an outer ring 2, a hub 3, a plurality of balls 4 each of which is a rolling element, and sealing devices 5 and 22.

Regarding the hub unit bearing 1, the outside in the axial direction is the left side in the width direction of the vehicle when assembled to the vehicle, and the inside in the axial direction is the outside in the width direction of the vehicle when assembled to the vehicle. It is the right side of FIGS. 1 and 2, which is the center side in the width direction.

The outer ring 2 is made of a hard metal such as medium carbon steel. The outer ring 2 has a double-row outer ring tracks 6a and 6b on the inner peripheral surface, and has a stationary flange 7 protruding outward in the radial direction at an axial intermediate portion. The stationary flange 7 has support holes 8 penetrating in the axial direction at a plurality of locations in the circumferential direction in the radial intermediate portion. The outer ring 2 is supported and fixed to the suspension device by a support bolt screwed into the support hole 8 of the stationary flange 7, and does not rotate even when the wheel rotates.

The hub 3 is arranged coaxially with the outer ring 2 on the inner side in the radial direction of the outer ring 2, and has a double-row inner ring race tracks 9a and 9b facing the double-row outer ring race tracks 6a and 6b on the outer peripheral surface. The hub 3 has a rotary flange 10 projecting radially outward at a portion located axially outward from the outer ring 2, and has a cylindrical pilot portion 11 at an axially outer end. The rotary flange 10 has mounting holes 12 penetrating in the axial direction at a plurality of locations in the circumferential direction on the outer side in the radial direction. A stud 13 is press-fitted into each of the mounting holes 12. The rotating body for braking such as a disc or a drum, and the wheel constituting the wheel are provided with the pilot portion 11 inserted into the central hole provided in the central portion and at a plurality of locations in the circumferential direction in the radial middle portion. With the stud 13 inserted into the through hole, the hub nut is screwed into the tip of the stud 13 to be coupled to the rotary flange 10.

The mounting hole of the rotary flange may be formed by a female screw hole. In this case, by screwing the hub bolt through which the through hole provided in the braking rotating body and the through hole provided in the wheel are inserted into the mounting hole, the braking rotating body and the wheel are attached to the rotating flange. Bond and fix.

The hub 3 has a spline hole 14 penetrating in the axial direction at the center thereof. The tip of a drive shaft that is rotationally driven by an engine or an electric motor as a drive source is spline-engaged with the spline hole 14. When the automobile is traveling, the hub 3 is rotationally driven by the drive shaft to rotationally drive the wheels and the rotating body for braking that are coupled and fixed to the rotary flange 10 of the hub 3.

In this example, the rotary flange 10 has a thick portion 23 forming a radial inner portion and a thin portion 24 constituting a radial outer portion having an axial dimension smaller than that of the thick portion 23. It is made continuous by the step portion 25 provided on the side surface. The step portion 25 has a concave arc-shaped cross-sectional shape that is inclined inward in the axial direction toward the inside in the radial direction. The mounting hole 12 is provided in the thin wall portion 24. Further, the hub 3 has a cylindrical shoulder portion 26 on a portion of the outer peripheral surface adjacent to the outer side of the inner ring track 9a in the axial outer row in the axial direction. Further, the hub 3 has an arcuate cross-sectional shape at the connection portion between the radial inner end portion of the axial inner side surface of the rotary flange 10 (thick wall portion 23) and the axial outer end portion of the shoulder portion 26. It has a corner R portion 27 which is a concave curved portion.

The hub 3 of this example is a combination of the inner ring 15 and the hub ring 16.

The inner ring 15 is made of a hard metal such as bearing steel. The inner ring 15 has an inner ring track 9b in the inner row in the axial direction among the inner ring races 9a and 9b in the double row on the outer peripheral surface.

The hub ring 16 is made of a hard metal such as medium carbon steel. The hub ring 16 has an inner ring track 9a in the outer row in the axial direction among the inner ring races 9a and 9b in the double row at the intermediate portion in the axial direction of the outer peripheral surface. The hub ring 16 has a rotary flange 10 projecting outward in the radial direction at a portion located on the outer side in the axial direction from the inner ring track 9a in the outer row in the axial direction, and has a cylinder at an end on the outer side in the axial direction. It has a pilot unit 11 in the shape of a cylinder. The hub ring 16 has a shoulder portion 26 on the outer peripheral surface adjacent to the axial outer side of the inner ring track 9a in the axial outer row, and a corner R portion on the portion adjacent to the axial outer side of the shoulder portion 26. Has 27. Further, the hub ring 16 has a spline hole 14 penetrating in the axial direction at the center thereof.

The hub ring 16 has a smaller outer diameter than a portion adjacent to the outer side in the axial direction in a portion located inside the inner ring track 9a in the outer row in the axial direction, and the fitting cylinder portion 17 into which the inner ring 15 is externally fitted is fitted. Have. The hub ring 16 further has a caulking portion 18 that bends radially outward from the axially inner end of the fitting cylinder portion 17 and presses the axially inner end surface of the inner ring 15. That is, the hub 3 of this example is present at the axially outer end of the fitting cylinder 17 in a state where the inner ring 15 is tightly fitted and fitted to the fitting cylinder 17 of the hub ring 16 in the axial direction. The inner ring 15 is sandwiched between the stepped surface 19 facing the surface and the outer surface in the axial direction of the caulking portion 18 from both sides in the axial direction, and the inner ring 15 and the hub ring 16 are coupled and fixed. It should be noted that the caulking portion 18 is omitted, the drive shaft is spline-engaged with the spline hole 14, and the axial outer surface of the outer ring of the CVJ coupled to the axially inner end portion (base end portion) of the drive shaft is formed. It is also possible to connect and fix the hub ring and the inner ring by screwing and tightening a nut to the axially outer end (tip) of the drive shaft while the inner ring 15 is abutted against the inner end surface in the axial direction. can. Further, in a hub unit bearing for a driven wheel provided with a solid hub wheel, the inner ring and the hub wheel can be connected and fixed by a nut.

A plurality of balls 4 are arranged between the outer ring orbits 6a and 6b of the double rows and the inner ring orbits 9a and 9b of the double rows, one in each row, separated in the circumferential direction, and the respective rows. It is rotatably held by the cage 20 of the above. As a result, the hub 3 is rotatably supported inward in the radial direction of the outer ring 2. In this example, the ball 4 is used as the rolling element, but a tapered roller can also be used as the rolling element. Further, in this example, the pitch circle diameter of the ball 4 in the outer row in the axial direction and the pitch circle diameter of the ball 4 in the inner row in the axial direction are the same as each other. It can also be applied to PCD type hub unit bearings having different diameters in which the pitch circle diameter and the pitch circle diameter of the rolling elements in the inner row in the axial direction are different from each other.

Grease, which is a lubricant, is sealed in a substantially cylindrical internal space 21 that exists between the inner peripheral surface of the outer ring 2 and the outer peripheral surface of the hub 3 and in which the balls 4 are arranged. The rolling contact portion between the surface (rolling surface) of the ball 4 and the outer ring tracks 6a, 6b and the inner ring tracks 9a, 9b, and the sliding contact portion between the surface of the ball 4 and the inner surface of the pocket of the cage 20 are internal spaces. It is lubricated by the grease enclosed in 21.

The axially inner opening of the internal space 21 is closed by the sealing device 22, and the axially outer opening of the internal space 21 is closed by the sealing device 5. As a result, foreign matter such as muddy water invades the internal space 21 from the external space through the opening on the inner side in the axial direction and the opening on the outer side in the axial direction of the internal space 21, and the grease enclosed in the internal space 21 leaks to the external space. It prevents it from happening.

The sealing device 22 that closes the axially inner opening of the inner space 21 is fitted and fixed to the inner end of the outer ring 2 in the axial direction and the inner end of the inner ring 15 in the axial direction. It is a combination seal ring that is combined with a slinger.

As shown in FIG. 2, the sealing device 5 for closing the axially outer opening of the internal space 21 includes a hub sealing member 28 supported by the hub 3 and an outer ring sealing member 29 supported by the outer ring 2.

The hub seal member 28 includes a sliding contact ring 30 and an elastic material 31.

The sliding contact ring 30 is formed by pressing a metal plate having corrosion resistance into an annular shape as a whole. The sliding contact ring 30 is bent radially outward from the cylindrical fitting cylinder portion 32 and the axially outer end portion of the fitting cylinder portion 32, and is bent radially outward toward the axially outward side. It has a conical cylindrical connecting plate portion 33 that is inclined, and a circular plate-shaped side plate portion 34 that is bent from the radially outer end portion of the connecting plate portion 33 toward the radial outer side.

The sliding contact ring 30 is supported and fixed to the hub ring 16 by externally fitting the fitting cylinder portion 32 to the shoulder portion 26 of the hub ring 16 by tightening and fitting. In this state, the connecting plate portion 33 and the side plate portion 34 are arranged on the radial outer side of the corner R portion 27 without contacting the axial inner side surface of the rotary flange 10 and the corner R portion 27.

The elastic material 31 is made of an elastic material such as an elastomer such as rubber (for example, vulcanization molding), and is bonded and fixed to the sliding contact ring 30. The elastic material 31 includes an elastic base portion 35, an elastic cylinder portion 36, a suction cup 37, and an elastic ridge 38. In FIG. 2, the elastic material 31 is shown in a free state.

The elastic base portion 35 covers the radial outer portion of the axial outer surface, the outer peripheral surface, and the radial outer end portion of the axial inner surface surface of the surface of the side plate portion 34 constituting the sliding contact ring 30. The adhesiveness of the elastic material 31 to the sliding contact ring 30 (the bonding force of the elastic cylinder portion 36 to the side plate portion 34) is enhanced.

The elastic cylinder portion 36 is formed in a cylindrical shape (annular shape), and an axially inner end portion (base end portion) is coupled to a radial outer portion of the elastic base portion 35. In other words, the elastic cylinder portion 36 projects from the axially outer surface of the elastic base portion 35 toward the axially outer side over the entire circumference.

The suction cup 37 (the portion on the left side of the chain line α in FIG. 2) has a substantially V-shaped cross-sectional shape, is configured in an annular shape as a whole, and has an axially outer end (tip portion) of the elastic cylinder portion 36. ). The suction plate 37 has a conical tubular outer inclined tubular portion 39 in the radial outer portion of the axial outer portion, which is inclined in the direction toward the radial outer side toward the axial outer side, and has a radial outer portion in the axial direction. The inner portion has a conical tubular inner inclined tubular portion 40 that is inclined in the radial direction toward the outer side in the axial direction.

In the structure of this example, the suction cup 37 is pressed against the inner side surface of the thick portion 23 of the rotary flange 10 in the axial direction to elastically deform the outer inclined cylinder portion 39 and the inner inclined cylinder portion 40, and the shaft of the thick portion 23. The air in the space defined by the inner surface in the direction and the inner surface of the suction cup 37 is discharged to reduce the pressure in the space. As a result, the suction cup 37 is attracted to the inner side surface of the thick portion 23 in the axial direction over the entire circumference.

The elastic ridge 38 is coupled to the radially outer end of the elastic base 35 over the entire circumference. The elastic ridge 38 exists in a portion adjacent to the inner side of the outer peripheral surface of the elastic cylinder portion 36 in the axial direction, has an outer diameter larger than that of the elastic cylinder portion 36, and prevents muddy water from flowing toward the contact seal portion 52 side. I'm preventing it.

The outer ring sealing member 29 includes a core metal 41 and a sealing material 42.

The core metal 41 is formed by pressing a metal plate, and is formed in an annular shape as a whole. The core metal 41 includes a cylindrical fitting cylinder portion 43, an annular plate-shaped outward flange portion 44 bent outward in the radial direction from an axially outer end portion of the fitting cylinder portion 43, and a fitting cylinder. A support plate portion 45 having a substantially circular ring plate shape, which is bent inward in the radial direction from an axially inner end portion of the portion 43, is provided. The outward flange portion 44 has a concave portion 46 recessed in the radial outer portion of the axial inner surface surface toward the axial outer side than the radial inner portion.

The core metal 41 is supported and fixed to the outer ring 2 by internally fitting the fitting cylinder portion 43 to the inner peripheral surface of the outer peripheral end portion of the outer ring 2 in the axial direction by tightening. Further, in this state, the axial inner surface of the axial inner surface of the outward flange 44 is brought into contact with the axial outer end surface of the outer ring 2, whereby the axial position of the core metal 41 with respect to the outer ring 2 is restricted. ing.

The sealing material 42 is made of an elastic material such as an elastomer such as rubber (for example, vulcanization molding), and is bonded and fixed to the core metal 41. The sealing material 42 includes a sealing base 47, a plurality of (three in the illustrated example) seal lips 48a, 48b, 48c, a gasket portion 49, and a damming portion 50. In addition, in FIG. 2, the sealing material 42 is shown in a free state.

Of the surface of the core metal 41, the seal base portion 47 includes a recess 46, an outer peripheral surface of the outward flange portion 44, an axial outer surface of the outward flange portion 44, an inner peripheral surface of the fitting cylinder portion 43, and a support plate. It covers a continuous range of the axial outer surface, the inner peripheral surface, and the radial inner end of the axial inner surface of the portion 45.

In the structure of this example, the radial outer end of the elastic ridge 38 of the hub seal member 28 is on the inner peripheral surface of the axially outer end of the portion of the seal base 47 that covers the inner peripheral surface of the fitting cylinder portion 43. The parts are close to each other over the entire circumference. As a result, a labyrinth is performed between the radially outer end of the elastic ridge 38 and the inner peripheral surface of the axially outer end of the seal base 47 that covers the inner peripheral surface of the fitting cylinder 43. The seal portion 53 is configured.

Of the three seal lips 48a, 48b, and 48c, the seal lip 48a closest to the internal space 21 has a base end bonded to the radially inner end of the seal base 47. The seal lip 48a is formed in a conical cylinder shape that is inclined inward in the axial direction toward the inside in the radial direction. The radial inner end (tip portion) of the seal lip 48a is in sliding contact with the outer peripheral surface of the fitting cylinder portion 32 constituting the sliding contact ring 30 over the entire circumference. As a result, the contact seal portion 51 is formed between the radially inner end of the seal lip 48a and the outer peripheral surface of the fitting cylinder portion 32.

Of the three seal lips 48a, 48b, and 48c, the seal lip 48b, which is the second closest to the internal space 21, has a base end bonded to the radially inner end of the seal base 47. The seal lip 48b is formed in a conical cylinder shape that is inclined outward in the radial direction toward the outside in the axial direction. The axially outer end (tip portion) of the seal lip 48b is in sliding contact with the axial inner side surface of the side plate portion 34 constituting the sliding contact ring 30 over the entire circumference. As a result, the contact seal portion 52 is formed between the axially outer end portion of the seal lip 48b and the axial inner side surface of the side plate portion 34.

Of the three seal lips 48a, 48b, and 48c, the seal lip 48c closest to the external space has a base end bonded to the radially outer end of the seal base 47. The seal lip 48c is formed in a conical cylinder shape that is inclined outward in the radial direction toward the outside in the axial direction. The end portion (tip portion) on the outer side in the axial direction of the seal lip 48c is brought close to the step portion 25 provided on the inner side surface in the axial direction of the rotary flange 10 over the entire circumference. As a result, the labyrinth seal portion 54 is formed between the axially outer end portion of the seal lip 48c and the step portion 25.

The gasket portion 49 protrudes inward in the axial direction from the radial intermediate portion of the portion of the seal base portion 47 that covers the recess 46 of the core metal 41, and elastically contacts the end surface on the outer side in the axial direction of the outer ring 2. .. The gasket portion 49 prevents foreign matter such as muddy water from entering the internal space 21 from the external space through the portion between the outer ring 2 and the core metal 41, and the grease sealed in the internal space 21 leaks to the external space. Prevent that.

The damming portion 50 projects radially outward from the radial outer end of the seal base 47, and projects radially outward from the outer peripheral surface of the axially outer end of the outer ring 2. It is structured like a figure. The damming portion 50 dams the muddy water that has flowed outward in the axial direction along the outer peripheral surface of the outer ring 2, so that the muddy water is between the end portion on the outer side in the axial direction of the seal lip 48c and the step portion 25. Prevent intrusion.

According to the hub unit bearing of this example having the above configuration, the relative displacement between the hub 3 and the sliding contact ring 30 can be suppressed.

That is, in the structure of this example, among the sliding contact ring 30 and the elastic material 31 constituting the hub seal member 28, the suction cup 37 provided on the elastic material 31 is mounted on the inner side surface in the axial direction of the rotary flange 10 (thick wall portion 23). It is adsorbed to. Therefore, the suction force of the suction plate 37 with respect to the axial inner surface of the rotary flange 10 and the contact portion between the axial inner surface of the rotary flange 10 and the outer inclined cylinder portion 39 and the inner inclined cylinder portion 40 constituting the suction plate 37. It is possible to prevent slippage (creep) in the rotational direction from occurring in the fitting portion between the shoulder portion 26 of the hub ring 16 and the fitting cylinder portion 32 of the sliding contact ring 30 based on the frictional force acting on the hub ring 16. In other words, it is possible to suppress the occurrence of relative displacement in the rotational direction between the hub wheel 16 and the sliding contact ring 30. Therefore, it is possible to prevent the relative displacement in the axial direction from occurring between the hub ring 16 and the sliding contact ring 30 due to the relative displacement in the rotational direction.

Further, in the structure of this example, when the sliding contact ring 30 tends to be displaced (moved) inward in the axial direction with respect to the shoulder portion 26 of the hub ring 16, a suction cup with respect to the inner side surface in the axial direction of the rotary flange 10 Due to the suction force of 37 (specifically, a negative pressure is generated between the axial inner surface of the rotary flange 10 and the suction cup 37), the sliding contact ring 30 is shafted with respect to the shoulder portion 26 of the hub ring 16. It is possible to suppress the displacement inward in the direction. Further, when the sliding contact ring 30 tends to be displaced outward in the axial direction with respect to the shoulder portion 26 of the hub ring 16, the axial inner surface of the rotary flange 10 and the axis of the side plate portion 34 of the sliding contact ring 30. The shoulder portion 26 of the hub ring 16 is formed by the elastic material 31 (specifically, the suction plate 37, the elastic cylinder portion 36, and the radial outer portion of the elastic base portion 35) extending axially from the outer surface in the direction. It is possible to prevent the sliding contact ring 30 from being displaced outward in the axial direction.

As described above, in the structure of this example, since the axial displacement of the sliding contact ring 30 with respect to the shoulder portion 26 of the hub ring 16 can be suppressed, the axial tightening allowance of the seal lip 48b in the contact seal portion 52 is increased. It can suppress the change. As a result, the sealing torque and the sealing performance of the contact sealing portion 52 can be stabilized. Specifically, it is possible to prevent the sliding contact pressure of the seal lip 48b with respect to the sliding contact ring 30 from becoming excessive and increasing the sealing torque, or conversely, reducing the sliding contact pressure and deteriorating the sealing performance.

Further, in the structure of this example, each of the outer inclined cylinder portion 39 and the inner inclined cylinder portion 40 constituting the suction cup 37 is elastically in contact with the inner side surface in the axial direction of the rotary flange 10 over the entire circumference. .. Therefore, each of the outer inclined cylinder portion 39 and the inner inclined cylinder portion 40 acts as a gasket portion between the hub ring 16 and the sliding contact ring 30. That is, due to such an action as a gasket portion, foreign matter such as muddy water invades from the external space into the internal space 21 through the portion between the hub ring 16 and the sliding contact ring 30, and is sealed in the internal space 21. It is possible to prevent the grease from leaking to the external space.

In the case of carrying out the present invention, if the hub unit bearing 1 is assembled in a state where at least one of the hub ring 16 and the sliding contact ring 30 is heated, the axial inner surface of the rotary flange 10 and the suction cup 37 are formed after cooling. The space between them can be in a negative pressure state. This makes it possible to increase the suction force of the suction cup 37 with respect to the axial inner side surface of the rotary flange 10 and to enhance the action of the suction cup 37 as a gasket portion.

[Second example of the embodiment]
A second example of the embodiment of the present invention will be described with reference to FIGS. 4 and 5.

In the structure of this example, the elastic material 31a constituting the hub seal member 28 has a plurality (for example, 12 to 24) instead of the elastic cylinder portion 36 and the suction cup 37 (see FIGS. 2 and 3), each of which is formed in an annular shape. It is provided with an elastic column portion 56 (s), a plurality of suction cups 57 (the same number as the elastic column portions 56), and a gasket portion 58. Further, the elastic base portion 35a constituting the elastic material 31a covers the entire axial outer surface of the side plate portion 34 of the sliding contact ring 30.

Each of the plurality of elastic column portions 56 is configured as a columnar or prismatic column extending in the axial direction of the sliding contact ring 30. The plurality of elastic column portions 56 are arranged at a plurality of locations at equal intervals in the circumferential direction of the sliding contact ring 30, and the inner end portion (base end portion) of each axial direction is the radial outer side of the elastic base portion 35a. It is attached to the end of.

Each of the plurality of suction cups 57 (the portion on the left side of the chain line α in FIG. 4) is configured in a dish shape with the outer side in the axial direction open. The inner end portion of each of the plurality of suction cups 57 in the axial direction is coupled to the outer end portion (tip portion) in the axial direction of the elastic column portion 56. The elastic column portion 56 and the suction cup 57 coupled to each other are arranged coaxially with each other. The chain line β in FIG. 4 shows the central axes of the elastic column portion 56 and the suction cup 57 connected to each other.

In the structure of this example, each of the plurality of suction cups 57 is elastically deformed by pressing each of the plurality of suction cups 57 against the axial inner side surface of the thick portion 23 of the rotary flange 10, and each of the plurality of suction cups 57 is elastically deformed in the axial direction of the thick portion 23. The air in the space defined by the inner surface and the inner surfaces of the plurality of suction cups 57 is discharged to reduce the pressure in the space. As a result, each of the plurality of suction cups 57 is attracted to the inner side surface in the axial direction of the thick portion 23.

The gasket portion 58 is formed in a cylindrical shape, and an end portion (base end portion) inside in the axial direction is coupled to an end portion inside in the radial direction of the elastic base portion 35a. In other words, the gasket portion 58 projects from the radially inner end portion of the axial outer surface of the elastic base portion 35a toward the axial outer side over the entire circumference. The axially outer end (tip portion) of the gasket portion 58 is in elastic contact with the corner R portion 27 of the hub wheel 16 over the entire circumference.

In the hub unit bearing of this example having the above configuration, the suction force of the plurality of suction plates 57 with respect to the axial inner side surface of the rotary flange 10 (thick wall portion 23), the axial inner side surface of the rotary flange 10 and the plurality of suction plates. Based on the frictional force acting on the contact portion with 57 and the frictional force acting on the contact portion between the corner R portion 27 and the gasket 58, the fitting cylinder between the shoulder portion 26 of the hub ring 16 and the sliding contact ring 30. It is possible to prevent slippage (creep) in the rotational direction from occurring in the fitting portion with the portion 32. In other words, it is possible to suppress the occurrence of relative displacement in the rotational direction between the hub wheel 16 and the sliding contact ring 30. Therefore, it is possible to prevent the relative displacement in the axial direction from occurring between the hub ring 16 and the sliding contact ring 30 due to the relative displacement in the rotational direction.

Further, in the structure of this example, when the sliding contact ring 30 tends to be displaced inward in the axial direction with respect to the shoulder portion 26 of the hub ring 16, a plurality of suction cups 57 with respect to the inner side surface in the axial direction of the rotary flange 10 (Specifically, a negative pressure is applied between the axial inner surface of the rotary flange 10 and each of the suction cups 57), so that the sliding contact ring 30 is attached to the shoulder portion 26 of the hub ring 16. It is possible to suppress the displacement inward in the axial direction. Further, when the sliding contact ring 30 tends to be displaced outward in the axial direction with respect to the shoulder portion 26 of the hub ring 16, the axial inner surface of the rotary flange 10 and the axis of the side plate portion 34 of the sliding contact ring 30. The hub ring 16 is formed by the elastic material 31a (specifically, the plurality of suction plates 57 and the elastic column portion 56, and the radially outer end portion of the elastic base portion 35a) extending axially from the outer surface in the direction. It is possible to prevent the sliding contact ring 30 from being displaced outward in the axial direction with respect to the shoulder portion 26 of the above.

In particular, in the structure of this example, since a plurality of suction cups 57 are provided, even if the suction force of a part of the suction cups 57 is lost, the suction force of the remaining suction cups 57 causes the shoulder portion of the hub ring 16 to have a suction force. On the other hand, it is possible to prevent the sliding contact ring 30 from being displaced inward in the rotation direction or the axial direction.

Further, in the structure of this example, since the plurality of suction plates 57 are arranged apart from each other in the circumferential direction, they do not act as a gasket portion, but the gasket portion 58 makes the hub ring 16 and the sliding contact ring 30. It is possible to prevent foreign matter such as muddy water from entering the internal space 21 from the external space and the grease enclosed in the internal space 21 from leaking to the external space through the intervening portion.
Other configurations and actions and effects are the same as those of the first example (FIGS. 1 to 3) of the embodiment.

[Third example of the embodiment]
A third example of the embodiment of the present invention will be described with reference to FIG.

In the structure of this example, the sliding contact ring 30a includes a cylindrical reinforcing portion 59 that is bent outward in the axial direction from the radially outer end portion of the side plate portion 34. The reinforcing portion 59 reinforces the elastic cylinder portion 36 by being embedded in the elastic cylinder portion 36 constituting the elastic material 31b.

As described above, in the structure of this example, the elastic cylinder portion 36 is reinforced by the reinforcing portion 59. Therefore, when the sliding contact ring 30a tends to rotate with respect to the shoulder portion 26 of the hub ring 16, the elastic cylinder portion 36 can be sufficiently suppressed from being twisted and deformed. Therefore, the effect of suppressing the rotation of the sliding contact ring 30a with respect to the shoulder portion 26 of the hub ring 16 can be enhanced by that amount. Further, when the sliding contact ring 30a tends to be displaced inward in the axial direction with respect to the shoulder portion 26 of the hub ring 16, the elastic tubular portion 36 can be sufficiently suppressed from elastically extending in the axial direction. Therefore, the effect of suppressing the displacement of the sliding contact ring 30a with respect to the shoulder portion 26 of the hub ring 16 in the axial direction can be enhanced by that amount. Further, when the sliding contact ring 30a tends to be displaced outward in the axial direction with respect to the shoulder portion 26 of the hub ring 16, the elastic tubular portion 36 can be sufficiently suppressed from elastically contracting in the axial direction. Therefore, it is possible to enhance the effect of suppressing the displacement of the sliding contact ring 30a with respect to the shoulder portion 26 of the hub ring 16 in the axial direction.
Other configurations and actions and effects are the same as those of the first example (FIGS. 1 to 3) of the embodiment.

[Fourth Example of Embodiment]
A fourth example of the embodiment of the present invention will be described with reference to FIG. 7.

In the structure of this example, the sliding contact ring 30b is provided with notches 60 that open radially outward at a plurality of locations that are equidistant in the circumferential direction of the radially outer ends of the side plate portions 34a. Further, the sliding contact ring 30b includes a rectangular columnar reinforcing portion 59a that is bent at a right angle from the end edge portion on the inner side in the radial direction of each of the notches 60 at a plurality of locations in the circumferential direction toward the outer side in the axial direction. Each of these reinforcing portions 59a is embedded in each of the plurality of elastic column portions 56 constituting the elastic material 31c to reinforce each of the elastic column portions 56. In this example, when the sliding contact ring 30b is manufactured by pressing the metal plate as the material, the portion existing inside the notch 60 is adjacent to both sides in the circumferential direction of the portion. The reinforcing portion 59a is formed by separating the metal by shearing and bending the metal at a right angle toward the outer side in the axial direction. Further, the space inside each of the notches 60 is filled with a part of the elastic material 31c.

As described above, in the structure of this example, each of the elastic column portions 56 is reinforced by the reinforcing portions 59a. Therefore, when the sliding contact ring 30b tends to rotate with respect to the shoulder portion 26 of the hub ring 16, the elastic column portion 56 can be sufficiently suppressed from bending and deforming in the circumferential direction. Therefore, the effect of suppressing the rotation of the sliding contact ring 30b with respect to the shoulder portion 26 of the hub ring 16 can be enhanced by that amount. Further, when the sliding contact ring 30b tends to be displaced inward in the axial direction with respect to the shoulder portion 26 of the hub ring 16, the elastic column portion 56 can be sufficiently suppressed from elastically extending in the axial direction. Therefore, it is possible to enhance the effect of suppressing the displacement of the sliding contact ring 30b with respect to the shoulder portion 26 of the hub ring 16 in the axial direction by that amount. Further, when the sliding contact ring 30b tends to be displaced outward in the axial direction with respect to the shoulder portion 26 of the hub ring 16, the elastic column portion 56 can be sufficiently suppressed from elastically contracting in the axial direction. Therefore, it is possible to enhance the effect of suppressing the displacement of the sliding contact ring 30b with respect to the shoulder portion 26 of the hub ring 16 in the axial direction.
Other configurations and effects are the same as those of the second example (FIGS. 4 and 5) of the embodiment.

[Fifth Example of Embodiment]
A fifth example of the embodiment of the present invention will be described with reference to FIG.

In the structure of this example, the sliding contact ring 30c does not include a connecting plate portion 33 (see FIG. 2) between the fitting cylinder portion 32a and the side plate portion 34. That is, the side plate portion 34 is formed so as to bend outward in the radial direction from the end portion on the outer side in the axial direction of the fitting cylinder portion 32a. In this example, by increasing the axial dimension of the fitting cylinder portion 32a by the amount that the connecting plate portion 33 is omitted, the fitting length of the fitting cylinder portion 32a and the shoulder portion 26 of the hub ring 16 in the axial direction is increased. By increasing the size, the fitting strength of the fitting cylinder portion 32a with respect to the shoulder portion 26 is increased.

Further, the sliding contact ring 30c is bent outward in the axial direction from the radial outer end portion of the side plate portion 34, and is arranged on the radial outer side of the elastic cylinder portion 36 and the suction cup 37 constituting the elastic material 31d. , A cylindrical portion 61 is provided. The surface of the tubular portion 61 is covered with an elastic base portion 35b. In particular, the axially outer end (end surface) of the tubular portion 61, which corresponds to the abutting portion, is covered with a covering portion 62 provided on the elastic base portion 35b. In the structure of this example, the axially outer end portion of the tubular portion 61 is abutted against the axial inner side surface of the rotary flange 10 (thick wall portion 23) over the entire circumference via the covering portion 62. Thereby, the positioning of the sliding contact ring 30c with respect to the hub ring 16 in the axial direction is attempted. In the case of carrying out the present invention, the axially outer end of the tubular portion 61 may be directly brought into contact with the axially inner side surface of the rotary flange 10.

As described above, in the structure of this example, the axially outer end portion of the tubular portion 61 is brought into contact with the axially inner side surface of the rotary flange 10 over the entire circumference via the covering portion 62. Therefore, the effect of suppressing the rotation of the sliding contact ring 30c with respect to the shoulder portion 26 of the hub ring 16 can be enhanced by the amount of the frictional force acting on the contact portion between the axial inner side surface of the rotary flange 10 and the covering portion 62. .. Further, the effect of suppressing the displacement of the sliding contact ring 30c with respect to the shoulder portion 26 of the hub wheel 16 in the axial direction is enhanced by the amount that the tubular portion 61 is stretched in the axial direction with respect to the axial inner surface of the rotary flange 10. Can be done.

Further, in the structure of this example, not only the suction cup 37 but also the covering portion 62 acts as a gasket portion to allow muddy water or the like from the external space to the internal space 21 through the portion between the hub ring 16 and the sliding contact ring 30c. It is possible to prevent foreign matter from entering and the grease enclosed in the internal space 21 from leaking to the external space. Further, since the covering portion 62 can prevent the muddy water from reaching the installation portion of the suction cup 37, deterioration of the suction cup 37 can be prevented, and the suction force of the suction cup 37 can be maintained for a long period of time.
Other configurations and actions and effects are the same as those of the first example (FIGS. 1 to 3) of the embodiment.

[6th example of the embodiment]
A sixth example of the embodiment of the present invention will be described with reference to FIG.

In the structure of this example, the elastic material 31e replaces the annular elastic cylinder portion 36 and the suction cup 37 (see FIG. 8) in the same manner as in the second example (FIGS. 4 and 5) of the embodiment. It is provided with elastic column portions 56 and suction cups 57 arranged at a plurality of locations at equal intervals in the circumferential direction.
Other configurations and effects are the same as those of the second example (FIGS. 4 and 5) and the fifth example (FIG. 8) of the embodiment.

[7th example of the embodiment]
A seventh example of the embodiment of the present invention will be described with reference to FIG.

In the structure of this example, the sliding contact ring 30d protrudes outward in the axial direction from the radial intermediate portion of the side plate portion 34b, and is arranged inside the elastic cylinder portion 36 and the suction cup 37 constituting the elastic material 31f. The cylindrical portion 61a is provided.

The tubular portion 61a is formed by folding a part of the metal plate constituting the sliding contact ring 30d into a U shape by 180 degrees. The tubular portion 61a includes a cylindrical inner tubular portion 65 bent outward in the axial direction from the radially outer end portion of the inner side plate portion 63 constituting the radial inner portion of the side plate portion 34b, and the side plate portion 34b. A cylindrical outer cylinder portion 66 that is bent outward in the axial direction from the radially inner end portion of the outer side plate portion 64 that constitutes the radial outer portion and is coaxially overlapped on the radial outer side of the inner cylinder portion 65. It is provided with a connecting portion 67 having a semi-circular cross-sectional shape in which the outer side in the axial direction is convex, which connects the outer end portion in the axial direction of the inner cylinder portion 65 and the outer end portion in the axial direction of the outer cylinder portion 66.

In the structure of this example, the inner side plate portion 63 and the outer side plate portion 64 constituting the side plate portion 34b are arranged at the same axial positions as each other. The elastic material 31f is coupled to the outer side plate portion 64, and the tip portion of the seal lip 48b is in sliding contact with the axial inner side surface of the inner side plate portion 63.

In the structure of this example, on the axial inner side surface of the rotary flange 10 (thick wall portion 23), the axial outer end portion of the tubular portion 61a corresponding to the abutting portion (the axial outer surface of the connection portion 67). Of these, the top located in the central part in the radial direction) is abutted over the entire circumference. Thereby, the positioning of the sliding contact ring 30d with respect to the hub ring 16 in the axial direction is attempted.

As described above, in the structure of this example, the axially outer end portion of the tubular portion 61a is abutted against the axially inner side surface of the rotary flange 10 over the entire circumference. Therefore, the effect of suppressing the displacement of the sliding contact ring 30d with respect to the shoulder portion 26 of the hub ring 16 in the axial direction is enhanced by the amount that the tubular portion 61a is stretched in the axial direction with respect to the axial inner side surface of the rotary flange 10. be able to.
Other configurations and actions and effects are the same as those of the first example (FIGS. 1 to 3) of the embodiment.

[8th example of the embodiment]
An eighth example of the embodiment of the present invention will be described with reference to FIG.

In the structure of this example, the elastic material 31 g replaces the annular elastic cylinder portion 36 and the suction cup 37 (see FIG. 10) in the same manner as in the second example (FIGS. 4 and 5) of the embodiment. It is provided with elastic column portions 56 and suction cups 57 arranged at a plurality of locations at equal intervals in the circumferential direction. Further, the elastic material 31 g includes a gasket portion 58 similar to the case of the second example (FIGS. 4 and 5) of the embodiment. The base end portion of the gasket portion 58 is coupled to the axially outer surface of the inner side plate portion 63 constituting the sliding contact ring 30d.
Other configurations and effects are the same as those of the second example (FIGS. 4 and 5) and the seventh example (FIG. 10) of the embodiment.

[9th example of the embodiment]
A ninth example of the embodiment of the present invention will be described with reference to FIG.

In the structure of this example, the elastic material 31h does not include the gasket portion 58 (see FIG. 11). Instead, in the structure of this example, the inner peripheral surface and the outer peripheral surface of the tubular portion 61a constituting the sliding contact ring 30d are covered with the elastic base portion 35c constituting the elastic material 31h. Further, of the elastic base portion 35c, a pair of gasket portions 55a and 55a provided at the axially outer ends of the portions covering the inner peripheral surface and the outer peripheral surface of the tubular portion 61a are provided with a rotary flange 10 (thickness). It is elastically contacted with the inner side surface of the meat portion 23) in the axial direction over the entire circumference. As a result, foreign matter such as muddy water may enter the internal space 21 from the external space through the portion between the hub ring 16 and the sliding contact ring 30c, and the grease enclosed in the internal space 21 may leak to the external space. I'm preventing it.

Further, in the structure of this example, since the pair of gasket portions 55a and 55a are elastically contacted with the axial inner surface of the rotary flange 10 over the entire circumference, the pair with the axial inner surface of the rotary flange 10. The effect of suppressing the rotation of the sliding contact ring 30d with respect to the shoulder portion 26 of the hub ring 16 can be enhanced by the amount of the frictional force acting on the contact portions with the gasket portions 55a and 55a.
Other configurations and effects are the same as in the eighth example (FIG. 11) of the embodiment.

[10th example of the embodiment]
A tenth example of the embodiment of the present invention will be described with reference to FIG.

In the structure of this example, the outer side plate portion 64a constituting the side plate portion 34c of the sliding contact ring 30e is arranged axially outside the inner side plate portion 63. Therefore, in the structure of this example, the axial dimension of the outer tubular portion 66a constituting the tubular portion 61b is shorter than the axial dimension of the inner tubular portion 65. Further, in the structure of this example, the axial dimensions of the plurality of elastic column portions 56a constituting the elastic material 31i are shortened by the amount that the outer side plate portion 64a is arranged axially inside the inner side plate portion 63. The rigidity of each of the elastic column portions 56a is increased.

As described above, in the structure of this example, the rigidity of the elastic column portion 56a in each axial direction is increased. Therefore, when the sliding contact ring 30e tends to rotate with respect to the shoulder portion 26 of the hub ring 16, it is possible to prevent the elastic column portion 56a from bending and deforming in the circumferential direction. Therefore, the effect of suppressing the rotation of the sliding contact ring 30e with respect to the shoulder portion 26 of the hub ring 16 can be enhanced by that amount. Further, when the sliding contact ring 30e tends to be displaced inward in the axial direction with respect to the shoulder portion 26 of the hub ring 16, the elastic column portion 56a can be suppressed from elastically extending in the axial direction. Therefore, the effect of suppressing the displacement of the sliding contact ring 30e with respect to the shoulder portion 26 of the hub ring 16 in the axial direction can be enhanced by that amount. Further, when the sliding contact ring 30e tends to be displaced outward in the axial direction with respect to the shoulder portion 26 of the hub ring 16, the elastic column portion 56a can be suppressed from elastically contracting in the axial direction. Therefore, it is possible to enhance the effect of suppressing the displacement of the sliding contact ring 30e with respect to the shoulder portion 26 of the hub ring 16 in the axial direction.
Other configurations and effects are the same as in the ninth example (FIG. 12) of the embodiment.

The structures of the respective embodiments as described above can be appropriately combined and implemented as long as there is no contradiction.

The present invention can also be applied to hub unit bearings for driven wheels.

1 Hub unit bearing 2 Outer ring 3 Hub 4 Ball 5 Sealing device 6a, 6b Outer ring track 7 Static flange 8 Support hole 9a, 9b Inner ring track 10 Rotating flange 11 Pilot part 12 Mounting hole 13 Stud 14 Spline hole 15 Inner ring 16 Hub ring 17 Combined cylinder part 18 Caulking part 19 Stepped surface 20 Cage 21 Internal space 22 Sealing device 23 Thick part 24 Thin wall part 25 Step part 26 Shoulder part 27 Corner R part 28 Hub seal member 29 Outer ring seal member 30, 30a to 30d Sliding contact ring 31, 31a to 31h Elastic material 32, 32a Fitting cylinder 33 Connecting plate 34, 34a, 34b Side plate 35, 35a to 35c Elastic base 36 Elastic cylinder 37 Sucker 38 Elastic ridge 39 Outer inclined cylinder 40 Inner tilt Cylindrical part 41 Core metal 42 Sealing material 43 Fitting tubular part 44 Outward flange part 45 Support plate part 46 Recessed part 47 Sealing base 48a, 48b, 48c Seal lip 49 Gasket part 50 Damping part 51 Contact sealing part 52 Contact sealing part 53 Labyrinth Seal part 54 Labyrinth Seal part 55a, 55a Gasket part 56 Elastic column part 57 Sucker 58 Gasket part 59, 59a Reinforcement part 60 Notch 61, 61a Cylindrical part 62 Cover part 63 Inner side plate part 64 Outer side plate part 65 Inner cylinder part 66 Outer cylinder 67 Connection

Claims (3)

An outer ring having multiple rows of outer ring tracks on the inner peripheral surface,
A hub having a double-row inner ring track facing the double-row outer ring track on the outer peripheral surface and having a rotary flange protruding radially outward at a portion located axially outside the outer ring.
A plurality of rolling elements arranged in each row between the outer ring orbits of the double row and the inner ring orbits of the double row, and
A sealing device for closing the axially outer opening of the internal space existing between the inner peripheral surface of the outer ring and the outer peripheral surface of the hub is provided.
The sealing device has a hub sealing member supported by the hub and an outer ring sealing member supported by the outer ring.
The hub seal member has an annular sliding contact ring fitted to the hub and an elastic material coupled to the sliding contact ring.
The elastic material has a suction cup adsorbed on the inner side surface in the axial direction of the rotating flange.
The outer ring seal member has a seal lip that is slidably contacted with the axial inner side surface of the sliding contact ring.
Hub unit bearing. The sliding contact ring has an abutting portion abutted directly on the axial inner side surface of the rotating flange or via a part of the elastic material.
The hub unit bearing according to claim 1. The elastic material has a gasket portion that elastically contacts the surface of the hub over the entire circumference.
The hub unit bearing according to claim 1 or 2.

Images