JP2021191966A - Wheel support rolling bearing unit - Google Patents

Abstract

To provide a wheel support rolling bearing unit which secures high sealing performance while suppressing an increase of rotation torque, and does not cause the separation of a seal ring and a slinger even if a combination seal ring is in a single unit state.SOLUTION: A seal ring 40 comprises a core grid 41, a seal member 51 and a nose gasket part 61. The nose gasket part has a salient part 63 salient from an outside-diameter side cylinder part 42 of the core grid 41 at one end side in an axial direction, and a lock lip 64 extending from one end side of the salient part in the axial direction to the inside in a radial direction, and the seal ring is tightly fastened to a small-diameter part 44 of the outside-diameter side cylinder part 42. When a combination seal ring 20 is pressure-inserted and assembled between the outside-diameter side member 11 and an inner ring 13, a one-end side portion of the gasket part in the axial direction is moved to one end side in the axial direction at an outside-diameter side, a non-superimposed part of the gasket part is moved to the inside in the radial direction, the salient part 63 is also moved to the inside in the radial direction along with the non-superimposed part, and the lock lip 64 is deformed into a circular shape forming a protrusion at the other end side in the axial direction, thus constituting a non-contact lip.SELECTED DRAWING: Figure 4

Description

The present invention relates to a rolling bearing unit for wheel support, and more particularly to a rolling bearing unit for wheel support provided with a combination seal ring.

Since the rolling bearing unit for wheel support is used in a muddy water environment, a seal with good muddy water resistance that seals the end opening between the outer diameter side member and the inner diameter side member that rotate relative to each other is provided. It is required to wear it. As such a seal, a combination seal ring including a seal ring having a core metal and a seal material and a slinger is used.

In Patent Document 1, an inclined surface is provided at the tip of the vertical plate portion of the slinger, and the seal plate (corresponding to the seal ring of the present application) is slidably contacted with the radial lip that is in sliding contact with the inclined surface of the slinger and the vertical plate portion of the slinger. A wheel bearing device that has two side lips and a labyrinth seal that faces each other through a slight radial gap in the cylindrical part of the slinger to suppress an increase in the rotational torque of the seal and improve the sealing performance is described. Has been done.

Japanese Unexamined Patent Publication No. 2007-100844

By the way, in the case of a combination seal ring in which the side lip is only in sliding contact with the slinger, the seal ring and the slinger are easily separated when they are transported from the seal factory or when they are supplied to the fixed distribution device of the assembly machine at the bearing factory. There is a problem that is difficult to handle. Further, if the seal ring and the slinger are misaligned, the seal ring and the slinger cannot be press-fitted at the same time, and the seal press-fitting becomes a two-step process, which may lead to an increase in equipment cost and assembly cost.

In the vehicle bearing device described in Patent Document 1, the inclined surface of the slinger is pressed from the outside by the radial lip of the seal plate to make the seal plate and the slinger non-separable, but between the radial lip and the inclined surface of the slinger. However, there is a high possibility that friction torque will be generated and the low torque performance will be impaired, and there is room for further improvement.

The present invention has been made in view of the above-mentioned problems, and an object thereof is to ensure high sealing performance while suppressing an increase in rotational torque due to the sealing ring, and to provide a sealing ring even when the combined sealing ring is a single unit. It is an object of the present invention to provide a rolling bearing unit for wheel support that is not separated from a slinger.

The above object of the present invention is achieved by the following configuration.
(1) An outer diameter side member that has multiple rows of outer ring tracks on the inner peripheral surface and does not rotate even during use.
An inner diameter side member that has a double row of inner ring tracks on the outer peripheral surface and rotates with the wheels during use,
A rolling element provided between the two outer ring tracks and the two inner ring tracks so as to be rollable, and a rolling element, respectively.
A slinger formed in a substantially L-shaped cross section and a seal ring arranged so as to face the slinger in the axial direction are provided, and the outer diameter side member and the inner diameter side member are assembled to the outer diameter side member and the inner diameter side member. A combination seal ring that seals between the side members,
Rolling bearing unit for wheel support
The slinger includes an inner diameter side cylindrical portion that is externally fitted to the inner diameter side member, and an outer annular portion that extends radially outward from one end side in the axial direction of the inner diameter side cylindrical portion.
The seal ring is
A small diameter portion is provided on the outer peripheral surface on one end side in the axial direction, and extends inward in the radial direction from the outer diameter side cylindrical portion that is internally fitted to the outer diameter side member and the other end side in the axial direction of the outer diameter side cylindrical portion. With the inner ring part to be installed, and the core metal having
A sealing member having a plurality of lips fixed to the inner ring portion of the core metal and slidably contacting the other end side surface of the outer ring portion of the slinger.
It is fixed to the small diameter portion of the outer diameter side cylindrical portion of the core metal, has an outer diameter larger than the outer diameter of the outer diameter side cylindrical portion, and elastically fits with the inner peripheral surface of the outer diameter side member. The matching gasket portion, the protruding portion extending axially from the outer diameter side cylindrical portion of the core metal, and the protruding portion extending radially inward from the axial end portion of the protruding portion of the slinger. A nose gasket portion having a locking lip arranged to face one end side surface of the outer ring portion or one end side surface of an encoder fixed to the slinger.
Equipped with
The gasket portion has a superimposing portion that is on the other end side and superimposes radially on the small diameter portion of the core metal, and a non-superimposition portion that is on one end side and does not superimpose on the small diameter portion of the core metal in the radial direction.
When the combination seal ring is press-fitted between the outer diameter side member and the inner diameter side member and assembled, the one end side portion in the axial direction moves to the one end side in the axial direction on the outer diameter side of the overlapping portion, and the non-superimposing portion. Moves inward in the radial direction, the protruding portion also moves inward in the radial direction along with the non-superimposing portion, and the locking lip is deformed into an arc shape that is convex toward the other end side in the axial direction. Make up a non-contact lip,
Rolling bearing unit for wheel support.

According to the rolling bearing unit for wheel support of the present invention, after assembling the combined seal ring, the locking lip constitutes a non-contact lip by deformation, so that high sealing performance is ensured while suppressing an increase in rotational torque due to sealing. At the same time, the slinger and the seal ring do not separate even when the combined seal ring is in a single state, and the handleability of the combined seal ring is improved.

It is sectional drawing of the main part of the rolling bearing unit for wheel support which concerns on 1st Embodiment of this invention. FIG. 3 is a cross-sectional view showing a positional relationship when each component of the combination seal ring shown in FIG. 1 before assembly is arranged at a regular assembly position after assembly. It is sectional drawing of the main part which shows the state before assembling the combination seal ring shown in FIG. It is sectional drawing of the main part which shows the state after assembling the combination seal ring shown in FIG. It is sectional drawing which shows the positional relationship when each component before assembling the combination seal ring which concerns on 2nd Embodiment of this invention is arranged in the regular assembly position after assembling. It is sectional drawing which shows the positional relationship when each component before assembling of the combination seal ring which concerns on 3rd Embodiment of this invention is arranged in the regular assembly position after assembling. It is sectional drawing which shows the positional relationship when each component before assembling the combination seal ring which concerns on 4th Embodiment of this invention is arranged in the regular assembly position after assembling. It is sectional drawing which shows the positional relationship when each component before assembling of the combination seal ring which concerns on 5th Embodiment of this invention is arranged in the regular assembly position after assembling.

Hereinafter, the rolling bearing unit for wheel support according to each embodiment of the present invention will be described in detail with reference to the drawings.
Further, with respect to the axial direction of the wheel supporting rolling bearing unit 10, the “outboard” refers to the left side of FIG. 1 which is the outside of the vehicle body when the wheel supporting rolling bearing unit 10 is assembled to the automobile. On the contrary, the right side of FIG. 1, which is the center side of the vehicle body when the rolling bearing unit 10 for wheel support is assembled to the automobile, is called "inboard".
Further, with respect to the axial direction of the combined seal rings 20 and 20A to 20D, the "one end side" means the rolling bearing unit for wheel support in a state where the combined seal rings 20 and 20A to 20D are assembled to the rolling bearing unit 10 for wheel support. Refers to the right side of FIGS. 2 to 8 which is the outside of 10. On the contrary, the left side of FIGS. 2 to 8 inside the wheel supporting rolling bearing unit 10 in a state where the combined seal rings 20, 20A to 20D are assembled to the wheel supporting rolling bearing unit 10 is referred to as "the other end side". ..

(First Embodiment)
As shown in FIG. 1, the rolling bearing unit 10 for wheel support of the present embodiment is an inner diameter side member 11, a hub ring 12 which is an inner diameter side member, and an inner diameter side member which is separate from the hub wheel 12. , The inner ring 13 integrally fixed to the hub wheel 12, and a plurality of rollable two rows arranged between the outer peripheral surface of the hub wheel 12 and the inner ring 13 and the inner peripheral surface of the outer diameter side member 11. A ball (rolling element) 14, a pair of cages 16 that hold the two rows of balls 14 at substantially equal intervals in the circumferential direction, a seal ring 19 that closes the openings at both ends of the bearing internal space 10a, and a combination seal. A ring 20 is provided.

The hub ring 12 is a member having a substantially cylindrical shape, and a flange portion 12b extending radially outward from the outer peripheral surface is formed at an outboard side end portion (left side in the drawing). A plurality of hub bolts 17 for fastening a tire wheel, a brake rotor, etc. (not shown) are provided on the flange portion 12b at substantially equal intervals in the circumferential direction.

A small diameter step portion 12c is formed at the inboard side end portion (right side in the figure) of the hub ring 12, and after the inner ring 13 is externally fitted to the small diameter step portion 12c, the end portion of the small diameter step portion 12c is formed in diameter. The inner ring 13 is fixed to the hub ring 12 by caulking outward in the direction. Further, by pressing the inner ring 13 by caulking, an appropriate preload is applied.

Two rows of outer ring tracks 11a and 11a parallel to each other are formed on the inner peripheral surface of the outer diameter side member 11 so as to be separated from each other. Further, on the outer peripheral surfaces of the hub ring 12 and the inner ring 13, inner ring raceways 12a and 13a are formed corresponding to the outer ring raceways 11a and 11a of the outer diameter side member 11, respectively. In the two rows of orbitals composed of the inner ring orbitals 12a and 13a and the outer ring orbitals 11a and 11a, a plurality of balls 14 rotatably held by the cage 16 are arranged at equal intervals in the circumferential direction.

The plurality of balls 14 come into contact with the outer ring tracks 11a and 11a and the inner ring tracks 12a and 13a at predetermined contact angles with each other, and are arranged in a back combination. As a result, the hub ring 12 and the inner ring 13 can rotate with respect to the outer diameter side member 11.

Next, the combination seal ring 20 according to the first embodiment will be described in detail with reference to FIGS. 2 to 4. As shown in FIG. 2, the combination seal ring 20 includes a slinger 30 and a seal ring 40, and is assembled so as to face each other in the axial direction.

The slinger 30 has a diameter from the inner diameter side cylindrical portion 31 that is externally fitted to the inner ring 13 which is the inner diameter side member of the wheel support rolling bearing unit 10 and the axial end side (right end edge in FIG. 2) of the inner diameter side cylindrical portion 31. It is provided with an outer ring portion 32 that is bent outward in the direction and extends, and has an L-shaped cross section and is entirely annular. The slinger 30 is integrally formed by subjecting a metal plate having excellent corrosion resistance, such as a galvanized steel plate or a stainless steel plate, to a punching process by a press machine and a bending process such as a burring process.

On the outer surface 32a on one end side in the axial direction (right side in FIG. 2) of the outer annular portion 32, an encoder 34 in which magnetic rubber in which ferrite powder is mixed in rubber is formed in an annular shape is adhered and fixed by vulcanization molding or the like. Has been done. On the axial side surface of the encoder 34, S poles and N poles are arranged alternately and at equal intervals along the circumferential direction. Further, the encoder 34 extends beyond the outer diameter edge portion 32b of the outer annular portion 32 and reaches the other end side of the outer annular portion 32 on the outer diameter side. Further, the encoder 34 has an inner diameter lip 38 extending inward in the radial direction on the inner diameter side and sealing the fitting portion between the inner diameter side cylindrical portion 31 and the inner ring 13.

The seal ring 40 is made of a metal core metal 41 and an elastic material such as an elastomer such as rubber, and has a seal member 51 and a nose gasket portion 61 fixed to the core metal 41 by vulcanization molding or the like. Be prepared.

The core metal 41 is extended inward by bending inward from the other end side in the axial direction of the outer diameter side cylindrical portion 42 that is internally fitted to the outer diameter side member 11 of the rolling bearing unit 10 and the outer diameter side cylindrical portion 42. It has an inner ring portion 43, and has a substantially L-shaped cross section, and has an annular shape as a whole. A small diameter portion 44 having a diameter smaller than the outer diameter of the outer diameter side cylindrical portion 42 is provided on the outer peripheral surface of the outer diameter side cylindrical portion 42 on one end side in the axial direction. The core metal 41 is integrally formed by subjecting a metal plate such as a low carbon steel plate or a stainless steel plate to a punching process by a press machine and a bending process such as a burring process.

The seal member 51 has a base portion 55 fixed so as to cover both side surfaces 43a and 43b of the inner ring portion 43 of the core metal 41 and the inner peripheral edge portion 43c, and the base portion 55 diagonally upward in the axial direction from the base portion 55 toward the slinger 30. It comprises two sliding contact lips 52, 53 extending and one grease lip 54 extending radially inward from the base 55.

In the seal member 51, when the slinger 30 and the seal ring 40 are assembled so as to face each other in the axial direction, the tip edges of the two sliding contact lips 52 and 53 are on the other end side surface of the outer annular portion 32 of the slinger 30. The tip edge of one grease lip 54 is slidably contacted and is arranged on the outer peripheral surface of the inner diameter side cylindrical portion 31 with a slight tightening margin or through a slight gap.

The nose gasket portion 61 includes a gasket portion 62, a protruding portion 63, and a locking lip 64, and is formed in a substantially cylindrical shape. The gasket portion 62 has an outer diameter larger than the outer diameter of the outer diameter side cylindrical portion 42, and has an overlapping portion 62a on the other end side that overlaps with the small diameter portion 44 in the radial direction, and a small diameter portion 44 on one end side. It has a non-superimposing portion 62b that does not superimpose in the direction. The gasket portion 62 elastically fits with the inner peripheral surface of the outer diameter side member 11 to seal the fitting surface between the core metal 41 and the outer diameter side member 11. The protrusion 63 is formed so as to extend from the outer diameter side cylindrical portion 42 of the core metal 41 to one end side in the axial direction, and the locking lip 64 is radially inward from the one end portion in the axial direction of the protrusion 63. It is extended and arranged to face the side surface 34a at one end of the encoder 34. The outer diameter side corner portion of the one end side surface 34a of the encoder 34 in which the locking lip 64 is arranged to face each other is an inclined surface 39 due to chamfering or the like.

The nose gasket portion 61 is fixed to the outer peripheral surface of the small diameter portion 44 of the outer diameter side cylindrical portion 42 by vulcanization molding or the like, but the end surface 44a of the small diameter portion 44 is bonded because it has a fracture surface due to punching. The agent is not applied well, the adhesive strength is weak, or it is not adhered.

As described above, the combined seal ring 20 configured by combining the slinger 30 and the seal ring 40 in the axial direction is unitized by preventing the slinger 30 and the seal ring 40 from being separated. That is, the locking lip 64 is axially superimposed on one end side surface 34a of the encoder 34 on one end side in the axial direction of the encoder 34. As shown in FIG. 3, even if the slinger 30 tries to be displaced in a direction away from the seal ring 40, the locking lip 64 and one end side surface 34a of the encoder 34 engage with each other to prevent this displacement. That is, the locking lip 64 and the encoder 34 form a locking mechanism that prevents the slinger 30 and the seal ring 40 from being separated.
Further, since the grease lip 54 of the seal member 51 is in sliding contact with the outer peripheral surface of the inner diameter side cylindrical portion 31 of the slinger 30 or faces the outer peripheral surface via a slight gap, the radial movement of the seal ring 40 with respect to the slinger 30 is also restricted. The slinger 30 and the seal ring 40 are centered.

As shown in FIG. 3, the slinger 30 and the seal ring 40 are prevented from being separated, and the slinger 30 is handled when the combined seal ring 20 is transported from the seal factory or when it is supplied to the fixed distribution device of the assembly machine at the bearing factory. And the seal ring 40 can be supplied at the same time, and the work efficiency is improved.

Such a combination seal ring 20 is incorporated between the inner peripheral surface of the end portion of the outer diameter side member 11 and the outer peripheral surface of the end portion of the inner ring 13 which is the inner diameter side member, with reference to FIG. Then, the tip edges of the sliding contact lips 52 and 53 of the seal member 51 are slidably contacted with the other end side surface of the outer annular portion 32 of the slinger 30, and the tip edge of one grease lip 54 is further brought into contact with the inner diameter side cylindrical portion 31. It is slidably contacted with the outer peripheral surface to close the inboard side end opening of the bearing internal space 10a. As a result, the grease sealed in the bearing internal space 10a is prevented from leaking to the outside, and various foreign substances such as rainwater, muddy water, and dust existing outside are prevented from entering the bearing internal space 10a.

Further, as shown in FIG. 2, in the normal assembly position where the slinger 30 before assembly and the seal ring 40 are shown in the positional relationship after assembly, the locking lip 64 is one end of the encoder 34. It is in a positional relationship that interferes with the side surface 34a. However, by assembling the combination seal ring 20 to the outer diameter side member 11 and the inner ring 13, the locking lip 64 is deformed to form a non-contact lip, and the interference between the locking lip 64 and the encoder 34 is eliminated.

Specifically, as shown in FIG. 4, when the combined seal ring 20 is press-fitted between the outer diameter side member 11 and the inner ring 13 of the inner diameter side member and assembled, the gasket portion 62 has the smaller diameter portion 44 and the outer diameter. It is crushed by the side member 11, and the one end side portion in the axial direction on the outer diameter side of the overlapping portion 62a of the gasket portion 62 moves to the one end side in the axial direction (right side in FIG. 4), and the gasket portion 62 is not superposed. The portion 62b is pushed by the outer diameter side member 11 and moves inward in the radial direction (lower side in FIG. 4).

At the same time, as a result of the projecting portion 63 overhanging from the end surface 44a of the small diameter portion 44 to the one end side in the axial direction and moving inward in the radial direction along with the non-superimposing portion 62b, the projecting portion 63 near the end surface 44a of the small diameter portion 44 A compressive stress is applied to the other end side surface of the locking lip 64, and one end side surface of the locking lip 64 is pulled upward, so that the locking lip 64 is deformed into an arc shape in which the other end side in the axial direction is convex. As a result, the locking lip 64 is separated from the inclined surface 39, which is one end side surface 34a of the encoder 34, and a labyrinth seal is formed with a slight gap between the locking lip 64 and the inclined surface 39.

Further, the inner diameter lip 38 of the encoder 34 has a tightening allowance on the outer peripheral surface of the inner ring 13 and abuts over the entire circumference to seal the fitting surface between the slinger 30 and the inner ring 13.

As described above, in the combined seal ring 20 of the present embodiment, the sliding contact lips 52 and 53 of the seal ring 40 are in sliding contact with the other end side surface of the outer annular portion 32 of the slinger 30, and the nose gasket portion 60 is locked. Since the labyrinth seal is formed between the lip 64 and the inclined surface 39 of the encoder 34, high sealing performance can be ensured without generating unnecessary torque. On the other hand, in the state before the combination seal ring 20 is assembled to the outer diameter side member 11 and the inner ring 13, the locking lip 64 of the nose gasket portion 60 and the inclined surface 39 of the encoder 34 overlap each other when viewed from the axial direction. Since the relative axial movement of the slinger 30 and the seal ring 40 is prevented, non-separation of the slinger 30 and the seal ring 40 is realized.
Further, since the grease lip 54 is slidably contacted with the outer peripheral surface of the inner diameter side cylindrical portion 31 of the slinger 30 or is opposed to the outer peripheral surface of the slinger 30 via a gap with a slight tightening margin, higher sealing performance can be ensured. Centering of the slinger 30 and the seal ring 40 can be realized.

(Second Embodiment)
Next, the combination seal ring applied to the rolling bearing unit for wheel support of the second embodiment will be described with reference to FIG.
In the second to fifth embodiments described below, only the parts different from those of the first embodiment will be described, and the same parts as those of the first embodiment are designated by the same reference numerals or equivalent reference numerals to simplify the description. Or omit it.

In the combination seal ring 20A of the second embodiment, the sealing space S defined by the slinger 30 and the seal ring 40 and the drain hole 65 that communicates with the outside are formed in the locking lip 64 of the nose gasket portion 61. ing. As a result, even if water or the like enters the seal space S, it can be immediately discharged to the outside from the drain hole 65, and the sealing performance of the combined seal ring 20A can be maintained. The position of the drain hole 65 is preferably provided near the root of the locking lip 64 in order to effectively drain water.

Even if the water drain hole 65 is formed in the locking lip 64, if the small diameter side of the locking lip 64 is connected, the deformation of the locking lip 64 into an arc shape in which the other end side in the axial direction is convex is hindered. Will not be done. Rather, the rigidity of the radial intermediate portion of the locking lip 64 is reduced, so that the locking lip 64 can be easily deformed into an arc shape.

(Third Embodiment)
Next, the combination seal ring applied to the rolling bearing unit for wheel support of the third embodiment will be described with reference to FIG.

In the combination seal ring 20B of the third embodiment, the base portion 55 of the seal member 51 made of an elastic member such as rubber covers the entire inner peripheral surface 42a of the outer diameter side cylindrical portion 42 of the core metal 41, and the nose is formed. It is integrally formed with the gasket portion 61. As a result, it is not necessary to use expensive non-rust steel for the core metal 41, which is difficult to press, and the cost can be reduced.

(Fourth Embodiment)
Next, the combination seal ring applied to the rolling bearing unit for wheel support of the fourth embodiment will be described with reference to FIG. 7.

The combination seal ring 20C of the fourth embodiment has a configuration without an encoder 34 as compared with the slinger 30 of the first embodiment, and the locking lip 64 of the nose gasket portion 61 is a slinger when viewed from the axial direction. It overlaps with one end side surface 32a of the outer ring portion 32 of 30. Also in this combination seal ring 20C, when the gasket portion 62 is crushed by the small diameter portion 44 and the outer diameter side member 11, the locking lip 64 is deformed into an arc shape in which the other end side in the axial direction is convex, and the non-contact lip. To form a labyrinth seal with the slinger 30.

(Fifth Embodiment)
Next, the combination seal ring applied to the rolling bearing unit for wheel support according to the fifth embodiment will be described with reference to FIG.

The combination seal ring 20D of the fifth embodiment has a configuration that does not have the grease lip 54 of the seal member 51 as compared with the combination seal ring 20C of the fourth embodiment. Therefore, the grease lip 54 does not have the effect of centering the slinger 30 and the seal ring 40. However, the outer diameter side of the outer annular portion 32 of the slinger 30 is bent toward the other end side in the axial direction to form an inclined surface 33, and the locking lip 64 of the nose gasket portion 61 is slidably contacted with the inclined surface 33. Therefore, the centering of the slinger 30 and the seal ring 40 can be realized.

The present invention is not limited to the above-described embodiment, and can be appropriately modified, improved, and the like.
For example, the rolling bearing unit for wheel support to which the combination seal ring is assembled is not limited to this embodiment, and may have other configurations.

As described above, the following matters are disclosed in the present specification.
(1) An outer diameter side member that has multiple rows of outer ring tracks on the inner peripheral surface and does not rotate even during use.
An inner diameter side member that has multiple rows of inner ring tracks on the outer peripheral surface and rotates with the wheels during use,
A rolling element provided between the two outer ring tracks and the two inner ring tracks so as to be freely tumblable,
A slinger formed in a substantially L-shaped cross section and a seal ring arranged axially opposite the slinger are provided, and are assembled to the outer diameter side member and the inner diameter side member to form the outer diameter side member and the inner diameter side member. A combination seal ring that seals between the side members,
Rolling bearing unit for wheel support
The slinger includes an inner diameter side cylindrical portion that is externally fitted to the inner diameter side member, and an outer annular portion that extends radially outward from one end side in the axial direction of the inner diameter side cylindrical portion.
The seal ring is
A small diameter portion is provided on the outer peripheral surface on one end side in the axial direction, and extends inward in the radial direction from the outer diameter side cylindrical portion that is internally fitted to the outer diameter side member and the other end side in the axial direction of the outer diameter side cylindrical portion. With the inner ring part to be installed, and the core metal having
A sealing member having a plurality of lips fixed to the inner ring portion of the core metal and slidably contacting the other end side surface of the outer ring portion of the slinger.
A gasket portion having an outer diameter larger than the outer diameter of the outer diameter side cylindrical portion and elastically fitting with the inner peripheral surface of the outer diameter side member, and an axial direction from the outer diameter side cylindrical portion of the core metal. A protrusion extending to one end side, and an encoder extending radially inward from one axial end of the protrusion and fixed to one end side surface of the outer annular portion of the slinger or to the slinger. A nose gasket portion having a locking lip arranged to face each other on one end side surface and being fixed to the small diameter portion of the outer diameter side cylindrical portion of the core metal.
Equipped with
The gasket portion has a superimposing portion that is on the other end side and superimposes radially on the small diameter portion of the core metal, and a non-superimposition portion that is on one end side and does not superimpose on the small diameter portion of the core metal in the radial direction.
When the combination seal ring is press-fitted between the outer diameter side member and the inner diameter side member and assembled, the one end side portion in the axial direction moves to the one end side in the axial direction on the outer diameter side of the overlapping portion, and the non-superimposing portion. Moves inward in the radial direction, the protruding portion also moves inward in the radial direction along with the non-superimposing portion, and the locking lip is deformed into an arc shape that is convex toward the other end side in the axial direction. Make up a non-contact lip,
Rolling bearing unit for wheel support.
According to this configuration, after assembling the combined seal ring, the locking lip constitutes a non-contact lip by deformation, so that high sealing performance is ensured while suppressing an increase in rotational torque due to the seal, and the combined seal ring is provided. The slinger and the seal ring do not separate even in the single state, which facilitates the handleability of the combined seal ring and the assembly to the rolling bearing unit for wheel support.

(2) The nose gasket portion is provided with a drain hole for communicating the internal space defined by the slinger and the seal ring with the outside.
The rolling bearing unit for wheel support according to (1).
According to this configuration, the water that has entered the internal space is surely discharged, and high sealing performance can be maintained.

(3) One end side surface of the outer ring portion of the slinger or one end side surface of the encoder fixed to the slinger on which the locking lip is arranged to face each other is an inclined surface.
The rolling bearing unit for wheel support according to (1) or (2).
According to this configuration, a labyrinth seal is formed between the locking lip constituting the non-contact lip and the inclined surface, and the sealing performance is improved.
Further, when the combination seal ring is in a single state and the locking lip is in contact with the inclined surface, centering of the slinger and the seal ring can be realized.

10 Rolling bearing unit for wheel support 11 Outer diameter side member 11a Outer ring track 12 Hub ring (inner diameter side member)
13 Inner ring (inner diameter side member)
12a, 13a Inner ring track 14 balls (rolling element)
20, 20A, 20B, 20C, 20D Combination seal ring 30 Slinger 31 Inner diameter side cylindrical part 32 Outer ring part 32a One end side surface 33, 39 Inclined surface 34 Encoder 34a Encoder end side surface 40 Seal ring 41 Core metal 42 Outer diameter side cylindrical part 43 Inner circular ring part 44 Small diameter part 51 Sealing member 52, 53 Sliding contact lip (lip)
54 Gree lip 61 Nose gasket part 62 Gasket part 62a Overlapping part 62b Non-overlapping part 63 Protruding part 64 Locking lip 65 Drain hole S Seal space

Claims (3)

An outer diameter side member that has multiple rows of outer ring tracks on the inner peripheral surface and does not rotate even during use,
An inner diameter side member that has multiple rows of inner ring tracks on the outer peripheral surface and rotates with the wheels during use,
A rolling element provided between the two outer ring tracks and the two inner ring tracks so as to be freely tumblable,
A slinger formed in a substantially L-shaped cross section and a seal ring arranged axially opposite the slinger are provided, and are assembled to the outer diameter side member and the inner diameter side member to form the outer diameter side member and the inner diameter side member. A combination seal ring that seals between the side members,
Rolling bearing unit for wheel support
The slinger includes an inner diameter side cylindrical portion that is externally fitted to the inner diameter side member, and an outer annular portion that extends radially outward from one end side in the axial direction of the inner diameter side cylindrical portion.
The seal ring is
A small diameter portion is provided on the outer peripheral surface on one end side in the axial direction, and extends inward in the radial direction from the outer diameter side cylindrical portion that is internally fitted to the outer diameter side member and the other end side in the axial direction of the outer diameter side cylindrical portion. With the inner ring part to be installed, and the core metal having
A sealing member having a plurality of lips fixed to the inner ring portion of the core metal and slidably contacting the other end side surface of the outer ring portion of the slinger.
A gasket portion having an outer diameter larger than the outer diameter of the outer diameter side cylindrical portion and elastically fitting with the inner peripheral surface of the outer diameter side member, and an axial direction from the outer diameter side cylindrical portion of the core metal. A protrusion extending to one end side, and an encoder extending radially inward from one axial end of the protrusion and fixed to one end side surface of the outer annular portion of the slinger or to the slinger. A nose gasket portion having a locking lip arranged to face each other on one end side surface and being fixed to the small diameter portion of the outer diameter side cylindrical portion of the core metal.
Equipped with
The gasket portion has a superimposing portion that is on the other end side and superimposes radially on the small diameter portion of the core metal, and a non-superimposition portion that is on one end side and does not superimpose on the small diameter portion of the core metal in the radial direction.
When the combination seal ring is press-fitted between the outer diameter side member and the inner diameter side member and assembled, the one end side portion in the axial direction moves to the one end side in the axial direction on the outer diameter side of the overlapping portion, and the non-superimposing portion. Moves inward in the radial direction, the protruding portion also moves inward in the radial direction along with the non-superimposing portion, and the locking lip is deformed into an arc shape that is convex toward the other end side in the axial direction. Make up a non-contact lip,
Rolling bearing unit for wheel support. The nose gasket portion includes an internal space defined by the slinger and the seal ring, and a drain hole for communicating with the outside.
The rolling bearing unit for wheel support according to claim 1. One end side surface of the outer ring portion of the slinger or one end side surface of the encoder fixed to the slinger on which the locking lip is arranged to face each other is an inclined surface.
The rolling bearing unit for wheel support according to claim 1 or 2.

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