JP2017207153A - Hub unit - Google Patents

Abstract

PROBLEM TO BE SOLVED: To suppress intrusion of water and the like from between a slinger and an inner ring, in a hub unit in which magnetized rubber is adhered to the slinger.SOLUTION: A seal device includes a core metal, seal rubber, a first slinger, and a second slinger. The core metal is fixed to an outer ring. The seal rubber is adhered to the core metal. The first slinger is fixed to an inner ring. The second slinger is disposed with a clearance to the first slinger. The first slinger includes an annular plate portion provided with magnetized rubber. The second slinger includes a second outer cylindrical portion, a second inner cylindrical portion, and an annular connecting portion. A first inner cylindrical portion of the first slinger is disposed between a second outer cylindrical portion and the second inner cylindrical portion. A clearance is radially formed between the first inner cylindrical portion and the second inner cylindrical portion. A clearance is radially formed between the first inner cylindrical portion and the second outer cylindrical portion. A clearance is axially formed between the first inner cylindrical portion and the annular connecting portion.SELECTED DRAWING: Figure 2

Description

  The present invention relates to a hub unit, and more particularly, to a hub unit including a sealing device that suppresses water and the like from entering between an inner ring and an outer ring.

  A hub unit is used to rotatably mount the wheel of an automobile to a suspension device. The hub unit includes, for example, an outer ring, an inner shaft, an inner ring, a plurality of first rolling elements, and a plurality of second rolling elements. The inner shaft is disposed so as to be rotatable with respect to the outer ring. The inner shaft is fixed to, for example, a constant velocity joint. The inner shaft is press-fitted into the inner ring. A plurality of first rolling elements are disposed between the inner shaft and the outer ring. A plurality of second rolling elements are disposed between the inner ring and the outer ring.

  The hub unit further includes a sealing device. The sealing device prevents water and the like from entering the hub unit from between the inner ring and the outer ring. The sealing device includes a cored bar, a sealing rubber, and a slinger. The core metal is press-fitted into the outer ring. The seal rubber is bonded to the core metal. The slinger is press-fitted into the inner ring. The seal rubber has a plurality of lips. Each of the plurality of lips contacts the slinger.

  As described above, the slinger is press-fitted into the inner ring. For this reason, water or the like may enter the hub unit from between the slinger and the inner ring. Therefore, a labyrinth seal has been proposed in order to prevent water and the like from entering between the slinger and the inner ring. Such a labyrinth seal is disclosed in, for example, Japanese Patent Application Laid-Open No. 2002-195280.

  In the above publication, an annulus having an inner cylinder and an outer cylinder is fixed to a constant velocity joint. A part of the cored bar is disposed between the inner cylinder and the outer cylinder. A minute gap is formed between the cored bar and the ring.

JP 2002-195280 A

  In the above publication, a labyrinth seal is formed using a part of the core metal. For this reason, for example, it is difficult to dispose a sensor that detects a change in the magnetic field accompanying rotation of the magnetized rubber by providing magnetized rubber to the slinger at a position facing the magnetized rubber in the axial direction.

  An object of the present invention is to prevent water or the like from entering between a slinger and an inner ring in a hub unit in which magnetized rubber is bonded to a slinger.

  A hub unit according to an embodiment of the present invention includes an outer ring, an inner shaft, an inner ring, and a plurality of rolling elements. The inner shaft is disposed so as to be rotatable with respect to the outer ring. The inner ring is inserted into the inner shaft and rotates integrally with the inner shaft. The plurality of rolling elements are disposed between the outer ring and the inner ring. The inner ring includes a raceway surface, an outer peripheral surface, and an annular end surface. A plurality of rolling elements are in contact with the raceway surface. The outer peripheral surface is connected to the raceway surface and extends in the axial direction of the inner ring. The annular end surface is connected to the outer peripheral surface and extends in the radial direction perpendicular to the axial direction. The hub unit further includes a sealing device and magnetized rubber. The sealing device is disposed closer to the annular end surface than the plurality of rolling elements in the axial direction. The magnetized rubber is attached to the sealing device. The sealing device includes a cored bar, a seal rubber, a first slinger, and a second slinger. The core metal is fixed to the outer ring. The seal rubber is bonded to the core metal. The first slinger is fixed to the inner ring. The second slinger is disposed with a gap between it and the first slinger. The first slinger includes a cylindrical portion and an annular plate portion. The cylindrical portion is in contact with the outer peripheral surface and extends in the axial direction. The annular plate portion is connected to the cylindrical portion, spreads outward in the radial direction, and has a magnetized rubber attached thereto. The tube portion includes a first inner tube portion and a first outer tube portion. The first inner cylinder portion is in contact with the outer peripheral surface. One end of the first inner cylinder portion in the axial direction is located outside the annular end surface in the axial direction. The first outer cylinder portion is connected to the other end of the first inner cylinder portion in the axial direction. The first outer cylinder portion is located on the outer side in the radial direction than the first inner cylinder portion. One end of the first outer cylinder portion in the axial direction is connected to the annular plate portion. The length of the first outer cylinder portion in the axial direction is shorter than the length of the first inner cylinder portion in the axial direction. The second slinger includes a second outer cylinder part, a second inner cylinder part, and an annular connection part. The second outer cylinder portion is located outside the first inner cylinder portion in the radial direction, and is disposed with a gap between the second outer cylinder portion and the first inner cylinder portion in the radial direction. The second inner cylinder part is located on the inner side of the first inner cylinder part in the radial direction, and is disposed with a gap between the second inner cylinder part and the first inner cylinder part in the radial direction. The annular connecting portion connects one end in the axial direction of the second outer cylindrical portion and one end in the axial direction of the second inner cylindrical portion, and a gap is provided between the first inner cylindrical portion in the axial direction. Are arranged apart from each other.

  In the hub unit according to the embodiment of the present invention, water or the like can be prevented from entering between the slinger and the inner ring.

It is sectional drawing of the hub unit by embodiment of this invention. It is sectional drawing which expands and shows a part of FIG. It is sectional drawing which shows the state by which the 2nd slinger of the sealing device was fixed to the inner ring | wheel of a hub unit.

  A hub unit according to an embodiment of the present invention includes an outer ring, an inner shaft, an inner ring, and a plurality of rolling elements. The inner shaft is disposed so as to be rotatable with respect to the outer ring. The inner ring is inserted into the inner shaft and rotates integrally with the inner shaft. The plurality of rolling elements are disposed between the outer ring and the inner ring. The inner ring includes a raceway surface, an outer peripheral surface, and an annular end surface. A plurality of rolling elements are in contact with the raceway surface. The outer peripheral surface is connected to the raceway surface and extends in the axial direction of the inner ring. The annular end surface is connected to the outer peripheral surface and extends in the radial direction perpendicular to the axial direction. The hub unit further includes a sealing device and magnetized rubber. The sealing device is disposed closer to the annular end surface than the plurality of rolling elements in the axial direction. The magnetized rubber is attached to the sealing device. The sealing device includes a cored bar, a seal rubber, a first slinger, and a second slinger. The core metal is fixed to the outer ring. The seal rubber is bonded to the core metal. The first slinger is fixed to the inner ring. The second slinger is disposed with a gap between it and the first slinger. The first slinger includes a cylindrical portion and an annular plate portion. The cylindrical portion is in contact with the outer peripheral surface and extends in the axial direction. The annular plate portion is connected to the cylindrical portion, spreads outward in the radial direction, and has a magnetized rubber attached thereto. The tube portion includes a first inner tube portion and a first outer tube portion. The first inner cylinder portion is in contact with the outer peripheral surface. One end of the first inner cylinder portion in the axial direction is located outside the annular end surface in the axial direction. The first outer cylinder portion is connected to the other end of the first inner cylinder portion in the axial direction. The first outer cylinder portion is located on the outer side in the radial direction than the first inner cylinder portion. One end of the first outer cylinder portion in the axial direction is connected to the annular plate portion. The length of the first outer cylinder portion in the axial direction is shorter than the length of the first inner cylinder portion in the axial direction. The second slinger includes a second outer cylinder part, a second inner cylinder part, and an annular connection part. The second outer cylinder portion is located outside the first inner cylinder portion in the radial direction, and is disposed with a gap between the second outer cylinder portion and the first inner cylinder portion in the radial direction. The second inner cylinder part is located on the inner side of the first inner cylinder part in the radial direction, and is disposed with a gap between the second inner cylinder part and the first inner cylinder part in the radial direction. The annular connecting portion connects one end in the axial direction of the second outer cylindrical portion and one end in the axial direction of the second inner cylindrical portion, and a gap is provided between the first inner cylindrical portion in the axial direction. Are arranged apart from each other.

  In the hub unit, a gap is formed in the axial direction and the radial direction between the first inner cylinder portion of the first slinger and the second slinger. That is, the labyrinth seal is realized by the first inner cylinder portion and the second slinger that the first slinger has. Therefore, it is possible to prevent water or the like from entering the hub unit from between the first inner cylinder portion and the inner ring of the first slinger.

  In the hub unit, the labyrinth seal is realized by skillfully using the first inner cylinder portion of the first slinger that is press-fitted into the outer peripheral surface of the inner ring. Therefore, it becomes easy to secure a space for arranging a sensor for detecting a change in the magnetic field generated with the rotation of the magnetized rubber at a position facing the magnetized rubber in the axial direction.

  In the hub unit, the second slinger may be disposed on the inner ring, or may be disposed on a constant velocity joint fixed to the inner shaft. When the second slinger is disposed on the inner ring, the outer peripheral surface of the inner ring preferably includes a first outer peripheral surface and a second outer peripheral surface. The first inner cylinder portion is in contact with the first outer peripheral surface. The second outer peripheral surface is located closer to the annular end surface than the first outer peripheral surface in the axial direction of the inner ring, and is located inside the first outer peripheral surface in the radial direction of the inner ring. The second inner cylindrical portion is in contact with the second outer peripheral surface.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. In the drawings, the same or corresponding parts are denoted by the same reference numerals, and the description thereof will not be repeated.

  FIG. 1 shows a hub unit 10 according to an embodiment of the present invention. In the following description, the axial direction is a direction in which the central axis CL of the hub unit 10 extends. The radial direction is a direction perpendicular to the central axis CL, that is, a direction perpendicular to the axial direction. The circumferential direction is a direction around the central axis CL. In a state where the hub unit 10 is arranged in the vehicle, one end side in the axial direction of the hub unit 10 (right end side in FIG. 1) corresponds to the inside of the vehicle, and the other end side in the axial direction of the hub unit 10 (in FIG. 1). The left end side) corresponds to the outside of the vehicle.

  Referring to FIG. 1, the hub unit 10 includes an outer ring 12, an inner shaft 14, an inner ring 16, a plurality of rolling elements 18, a plurality of rolling elements 20, a cage 22, a cage 24, and a seal. Device 26 and sealing device 28 are included. Hereinafter, these will be described.

  The outer ring 12 has a cylindrical shape with the central axis CL as the central axis. Two raceway surfaces 121 and 122 are formed on the inner peripheral surface of the outer ring 12. These track surfaces 121 and 122 are formed in an annular shape with the central axis CL as the central axis. The outer ring 12 is fixed to a suspension device, for example.

  The inner shaft 14 is disposed inside the outer ring 12 and is positioned coaxially with the outer ring 12. The inner shaft 14 is disposed so as to be rotatable in the circumferential direction with respect to the outer ring 12.

  The inner shaft 14 has a raceway surface 141. The raceway surface 141 is formed on the outer peripheral surface of the inner shaft 14. The raceway surface 141 is formed in an annular shape with the central axis line CL as the central axis.

  The inner shaft 14 further has a flange 142. The flange 142 is formed continuously in the circumferential direction.

  The flange 142 includes a plurality of holes 14A. The plurality of holes 14A are formed, for example, at equal intervals in the circumferential direction. A wheel (specifically, a wheel), a brake disk, or the like is attached to the inner shaft 14 by a bolt 30 inserted into each of the plurality of holes 14A.

  A through hole 14 </ b> B is formed in the inner shaft 14. The through hole 14B extends straight in the axial direction. An attachment shaft 4011 formed on the outer ring 401 of the constant velocity joint 40 is inserted into the through hole 14B. The attachment shaft 4011 is formed so as to protrude from the end surface 4012 of the outer ring 401.

  The nut 42 is attached to the tip of the attachment shaft 4011 in a state where the attachment shaft 4011 is inserted into the through hole 14B. Thereby, the constant velocity joint 40 is fixed to the inner shaft 14. In a state where the constant velocity joint 40 is fixed to the inner shaft 14, the end surface 4012 of the outer ring 401 of the constant velocity joint 40 is in contact with the inner ring 16 in the axial direction.

  The inner ring 16 is fixed to the inner shaft 14. Specifically, the inner ring 16 is fixed to the inner shaft 14 by press-fitting the inner shaft 14 into the inner ring 16.

  The inner ring 16 includes a raceway surface 161. The raceway surface 161 is formed on the outer peripheral surface of the inner ring 16. The raceway surface 161 is formed in an annular shape with the central axis CL as the central axis.

  Inner ring 16 includes an outer peripheral surface 162. The outer peripheral surface 162 is formed closer to one end side in the axial direction than the raceway surface 161. The outer peripheral surface 162 has a substantially constant diameter and extends straight in the axial direction. The outer peripheral surface 162 is a cylindrical surface having the central axis CL as the central axis. The outer peripheral surface 162 is connected to the track surface 161. That is, the outer peripheral surface 162 extends from the raceway surface 161 toward one end side in the axial direction. The outer peripheral surface 162 is located on the outer side in the radial direction from the outer peripheral surface 4013 of the outer ring 401 of the constant velocity joint 40. The outer peripheral surface 4013 is connected to the outer peripheral edge of the end surface 4012.

  Inner ring 16 includes an end surface 163. The end surface 163 is formed at one end of the inner ring 16 in the axial direction. The end surface 163 has an annular shape with the central axis CL as the central axis. The outer peripheral edge of the end surface 163 is connected to one end of the outer peripheral surface 162 in the axial direction. That is, the end surface 163 extends radially inward from one end of the outer peripheral surface 162 in the axial direction.

  The plurality of rolling elements 18 are disposed between the outer ring 12 and the inner shaft 14. The plurality of rolling elements 18 are arranged at equal intervals in the circumferential direction by the cage 22. Each of the plurality of rolling elements 18 contacts the raceway surface 121 and the raceway surface 141.

  The plurality of rolling elements 20 are disposed between the outer ring 12 and the inner ring 16. The plurality of rolling elements 20 are arranged at equal intervals in the circumferential direction by the cage 24. Each of the plurality of rolling elements 20 contacts the raceway surface 122 and the raceway surface 161.

  The sealing device 26 is disposed between the inner shaft 14 and the outer ring 12. Thereby, water or the like is prevented from entering the hub unit 10 from between the inner shaft 14 and the outer ring 12.

  The sealing device 28 is disposed between the inner ring 16 and the outer ring 12. Thereby, water or the like is prevented from entering the hub unit 10 from between the inner ring 16 and the outer ring 12.

  Details of the sealing device 28 will be described with reference to FIG. The sealing device 28 includes a core metal 28A, a slinger 28B, a seal rubber 28C, and a slinger 28D.

  The cored bar 28A is an annular member that continuously extends in the circumferential direction with the central axis CL as the central axis. The core metal 28A includes a cylindrical portion 28A1 and an annular plate portion 28A2. The cylindrical portion 28A1 has a cylindrical shape extending in the axial direction with the central axis CL as the central axis. The outer peripheral surface of the cylindrical portion 28A1 is in contact with the inner peripheral surface of the outer ring 12. The annular plate portion 28A2 extends in the radial direction. The annular plate portion 28A2 is formed with substantially the same width over the entire circumference in the circumferential direction. That is, the annular plate portion 28A2 has an annular shape having the central axis CL as the central axis when viewed from the axial direction. The annular plate portion 28A2 is connected to the axial end of the tubular portion 28A1. The annular plate portion 28A2 extends radially inward from the axial end of the tubular portion 28A1.

  The core metal 28A (specifically, the cylinder portion 28A1) is press-fitted into the outer ring 12. Thereby, the core metal 28 </ b> A is fixed to the outer ring 12.

  The seal rubber 28C is formed over the entire circumference in the circumferential direction. The sealing rubber 28C covers substantially the entire surface of the cored bar 28A except for the outer peripheral surface of the cylindrical portion 28A1. The seal rubber 28C is vulcanized and bonded to the core metal 28A. That is, the seal rubber 28C is formed integrally with the core metal 28A.

  The seal rubber 28C includes a plurality of lips 28C1, 28C2, and 28C3. Each of the plurality of lips 28C1, 28C2, 28C3 is formed over the entire circumference in the circumferential direction. Of the plurality of lips 28C1, 28C2, and 28C3, the lip 28C1 is positioned closest to the cylindrical portion 28A1 in the radial direction. The lip 28C2 is located closer to the one end side in the axial direction than the lip 28C3.

  The slinger 28B is an annular member that extends continuously in the circumferential direction about the central axis CL. The slinger 28B includes a cylindrical portion 28B1 and an annular plate portion 28B2.

  The cylinder portion 28B1 extends in the axial direction. The cylinder portion 28B1 is located on the inner side of the cored bar 28A in the radial direction. The cylinder portion 28B1 has a double cylinder shape as a whole. The cylinder part 28B1 includes a cylinder part 28B4 and a cylinder part 28B5.

  The cylinder portion 28B4 has a cylindrical shape with the central axis CL as the central axis. That is, the cylinder portion 28B4 has a substantially constant diameter and extends straight in the axial direction. The cylinder portion 28B4 is in contact with the outer peripheral surface 162 of the inner ring 16. One end in the axial direction of the cylindrical portion 28B4 is located on one end side in the axial direction with respect to the end face 163 of the inner ring 16.

  The cylindrical portion 28B5 has a cylindrical shape with the central axis CL as the central axis. That is, the cylinder portion 28B5 has a substantially constant diameter and extends straight in the axial direction. The cylinder portion 28B5 is in contact with the outer peripheral surface of the cylinder portion 28B5. That is, the cylinder part 28B5 is located on the outer side in the radial direction than the cylinder part 28B4.

  One end of the cylindrical portion 28B5 in the axial direction is positioned closer to the raceway surface 161 of the inner ring 16 than the one end of the cylindrical portion 28B4 in the axial direction. The other axial end of the cylindrical portion 28B5 is connected to the other axial end of the cylindrical portion 28B4. That is, the length in the axial direction of the cylinder portion 28B5 is shorter than the length in the axial direction of the cylinder portion 28B4.

  A lip 28C2 and a lip 28C3 are in contact with the outer peripheral surface of the cylindrical portion 28B5. Each of the lip 28C2 and the lip 28C3 is in an elastically deformed state and is in contact with the outer peripheral surface of the cylindrical portion 28B5. Thereby, the state where each of the lip 28C2 and the lip 28C3 is in contact with the outer peripheral surface of the cylindrical portion 28B5 is stabilized.

  The inner ring 16 is press-fitted into the cylindrical portion 28B1 (specifically, the cylindrical portion 28B4) of the slinger 28B. Thus, the slinger 28B is fixed to the inner ring 16.

  The annular plate portion 28B2 extends in the radial direction. The annular plate portion 28B2 is formed with substantially the same width over the entire circumference in the circumferential direction. That is, the annular plate portion 28B2 has an annular shape with the central axis CL as the central axis when viewed from the axial direction. The annular plate portion 28B2 is connected to one end of the cylindrical portion 28B5 in the axial direction. The annular plate portion 28B2 extends radially outward from one axial end of the tubular portion 28B5.

  The annular plate portion 28B2 is located on the inner side in the radial direction than the cylindrical portion 28A1 of the core metal 28A. The annular plate portion 28B2 is located on one end side in the axial direction with respect to the annular plate portion 28A2 of the core metal 28A.

  A magnetized rubber 32 is attached to the surface on the one end side in the axial direction of the annular plate portion 28B2 (that is, the surface closer to the end surface 163 in the axial direction). On the magnetized rubber 32, N poles and S poles are alternately magnetized in the circumferential direction. The magnetized rubber 32 is located on the other end side in the axial direction from the end face 163 of the inner ring 16.

  The lip 28C1 is in contact with the surface on the other end side in the axial direction of the annular plate portion 28B2 (that is, the surface away from the end face 163 in the axial direction). The lip 28C1 is in elastic deformation and is in contact with the annular plate portion 28B2. Thereby, the contact state of the lip 28C1 to the annular plate portion 28B2 is stabilized.

  The slinger 28D is disposed with a slight gap in the axial direction and the radial direction with respect to the cylindrical portion 28B4 of the slinger 28B. The slinger 28D is fixed to the outer ring 401 of the constant velocity joint 40. The slinger 28D has a double cylindrical shape as a whole. The slinger 28D includes a cylindrical portion 28D1, a cylindrical portion 28D2, and an annular portion 28D3.

  The cylindrical portion 28D1 has a cylindrical shape with the central axis CL as the central axis. That is, the cylinder portion 28D1 has a substantially constant diameter and extends straight in the axial direction. The cylindrical portion 28D1 is in contact with the outer peripheral surface 4013 of the outer ring 401 of the constant velocity joint 40.

  Here, the outer peripheral surface 4013 is located on the inner side in the radial direction than the outer peripheral surface 162 of the inner ring 16. The cylindrical portion 28D1 is located on the inner side of the outer peripheral surface 162 of the inner ring 16 in the radial direction. That is, the cylinder part 28D1 is located on the inner side in the radial direction than the cylinder part 28B4 of the slinger 28B. A slight gap is formed in the radial direction between the cylindrical portion 28D1 and the cylindrical portion 28B4.

  The cylinder portion 28D2 has a cylindrical shape with the central axis CL as the central axis. That is, the cylinder portion 28D2 has a substantially constant diameter and extends straight in the axial direction. The cylinder part 28D2 is located on the outer side in the radial direction than the cylinder part 28D1. The cylinder part 28D2 is located on the outer side in the radial direction than the cylinder part 28B4 of the slinger 28B. That is, a slight gap is formed in the radial direction between the cylinder portion 28D2 and the cylinder portion 28B4. The cylinder portion 28D2 is in a position overlapping the inner peripheral edge portion of the magnetized rubber 32 when viewed from the axial direction.

  One end in the axial direction of the tube portion 28D2 is at the same position as the one end in the axial direction of the tube portion 28D1. The other axial end of the cylindrical portion 28D2 is closer to the magnetized rubber 32 in the axial direction than the other axial end of the cylindrical portion 28D1. That is, the length in the axial direction of the cylinder portion 28D2 is longer than the length in the axial direction of the cylinder portion 28D1.

  The annular portion 28D3 connects the axial end of the cylindrical portion 28D1 and the axial end of the cylindrical portion 28D2 over the entire circumference in the circumferential direction. That is, the annular portion 28D3 as a whole has an annular shape with the central axis CL as the central axis. The annular portion 28D3 is separated in the axial direction from the cylindrical portion 28B4 of the slinger 28B. That is, a slight gap is formed in the axial direction between the annular portion 28D3 and the cylindrical portion 28B4.

  A part of the outer ring 401 (specifically, a portion having the outer peripheral surface 4013) is press-fitted into the slinger 28D (specifically, the cylinder portion 28D1). Thus, the slinger 28D is fixed to the outer ring 401.

  As described above, in the sealing device 28, a slight gap is formed in each of the radial direction and the axial direction between the cylindrical portion 28B4 of the slinger 28B and the slinger 28D. That is, the labyrinth seal is realized by the cylindrical portion 28B4 and the slinger 28D. Therefore, water or the like can be prevented from entering the hub unit 10 from between the outer peripheral surface 162 of the inner ring 16 and the cylindrical portion 28B4 of the slinger 28B.

  The labyrinth seal is realized by skillfully using the slinger 28B fixed to the inner ring 16. Therefore, it is easy to secure a space for arranging a sensor for detecting a change in the magnetic field generated by the rotation of the magnetized rubber 32 at a position facing the magnetized rubber 32 in the axial direction.

  The outer peripheral surface 4013 to which the slinger 28D is fixed is located radially inside the outer peripheral surface 162 to which the slinger 28B is fixed. Therefore, it is difficult for water or the like to enter the hub unit 10 from between the slinger 28B and the inner ring 16 (outer peripheral surface 162). The reason is as follows.

  Assume that water has passed through the labyrinth seal. If water or the like that has passed through the labyrinth seal adheres to the cylindrical portion 28D1 or the outer peripheral surface 4013 of the slinger 28D, it will enter the hub unit 10 from between the slinger 28B and the inner ring 16 (outer peripheral surface 162) unless it moves radially outward. I can't enter. Therefore, even if water or the like passes through the labyrinth seal, it is not easy to enter the hub unit 10 from between the slinger 28B and the inner ring 16 (outer peripheral surface 162).

[Application example 1 of hub unit]
In the above embodiment, the slinger 28D is fixed to the outer ring 401 of the constant velocity joint 40. However, as shown in FIG. 3, for example, the slinger 28D may be fixed to the inner ring 16A. That is, the slinger 28 </ b> D only needs to be fixed to a member attached to the inner shaft 14.

  The inner ring 16 </ b> A has an outer peripheral surface 162 </ b> A instead of the outer peripheral surface 162. 162 A of outer peripheral surfaces have the outer peripheral surface 1621, the outer peripheral surface 1622, and the level | step difference surface 1623. As shown in FIG.

  The outer peripheral surface 1621 has a substantially constant diameter and extends straight in the axial direction. That is, the outer peripheral surface 1621 is cylindrical. The outer peripheral surface 1621 is connected to the raceway surface 161. That is, the outer peripheral surface 1621 extends from the raceway surface 161 toward one end side in the axial direction. The cylindrical portion 28B4 is in contact with the outer peripheral surface 1621. That is, a portion having the outer peripheral surface 1621 in the inner ring 16A is press-fitted into the slinger 28B.

  The outer peripheral surface 1622 is formed on one end side in the axial direction with respect to the outer peripheral surface 1621. The outer peripheral surface 1622 has a substantially constant diameter and extends straight in the axial direction. That is, the outer peripheral surface 1622 is cylindrical with the central axis CL as the central axis. The outer peripheral surface 1622 is located on the inner side in the radial direction than the outer peripheral surface 1621.

  One end of the outer peripheral surface 1622 in the axial direction is connected to the outer peripheral edge of the end surface 163. The other end of the outer peripheral surface 1622 in the axial direction is connected to one end of the outer peripheral surface 1621 in the axial direction via a step surface 1623. The step surface 1623 has an annular shape with the central axis CL as the central axis.

  The cylindrical portion 28D1 is in contact with the outer peripheral surface 1622. That is, a portion having the outer peripheral surface 1622 in the inner ring 16A is press-fitted into the slinger 28D.

  In the example shown in FIG. 3 as well, the labyrinth seal is realized by the cylindrical portion 28B4 and the slinger 28D of the slinger 28B. That is, a slight gap is formed in each of the radial direction and the axial direction between the cylindrical portion 28B4 and the slinger 28D of the slinger 28B. Therefore, water or the like can be prevented from entering the hub unit 10 from between the outer peripheral surface 162 of the inner ring 16 and the cylindrical portion 28B4 of the slinger 28B.

  The outer peripheral surface 1622 to which the slinger 28D is fixed is located radially inside the outer peripheral surface 1621 to which the slinger 28B is fixed. This makes it difficult for water or the like to enter the hub unit from between the slinger 28B and the outer peripheral surface 1621. The reason is as follows.

  Assume that water has passed through the labyrinth seal. If water or the like that has passed through the labyrinth seal adheres to the cylindrical portion 28D1 or the outer peripheral surface 1622 of the slinger 28D, it will enter the hub unit 10 from between the slinger 28B and the inner ring 16 (outer peripheral surface 162) unless it moves radially outward. I can't enter. Therefore, even if water or the like passes through the labyrinth seal, it is not easy to enter the hub unit 10 from between the slinger 28B and the inner ring 16 (outer peripheral surface 162).

[Application example 2 of hub unit]
In the example shown in FIG. 3, the outer ring 401 of the constant velocity joint 40 is in contact with the inner ring 16, but, for example, a caulking portion formed at one axial end of the inner shaft 14 is in contact with the annular end surface 163 of the inner ring 16, and The outer ring 401 of the constant velocity joint 40 may be in contact with the caulking portion.

  As mentioned above, although embodiment of this invention was explained in full detail, these are illustrations to the last, Comprising: This invention is not limited at all by the above-mentioned embodiment.

10 Hub unit 12 Outer ring 14 Inner shaft 16 Inner ring 161 Raceway surface 162 Outer peripheral surface 163 End surface (annular end surface)
20 Rolling body 28 Sealing device 28A Core 28B Slinger (first slinger)
28B1 cylinder part 28B4 cylinder part (first inner cylinder part)
28B5 cylinder (first outer cylinder)
28B2 annular plate portion 28C seal rubber 28D slinger (second slinger)
28D1 cylinder (second inner cylinder)
28D2 cylinder part (second outer cylinder part)
28D3 Annular part (annular connection part)
32 Magnetized rubber

Claims (5)

A hub unit,
Outer ring,
An inner shaft arranged rotatably with respect to the outer ring;
An inner ring in which the inner shaft is inserted and rotates integrally with the inner shaft;
A plurality of rolling elements disposed between the outer ring and the inner ring;
The inner ring is
A raceway surface in contact with the plurality of rolling elements;
An outer peripheral surface connected to the raceway surface and extending in the axial direction of the inner ring;
An annular end surface connected to the outer peripheral surface and extending in a radial direction perpendicular to the axial direction,
The hub unit further includes:
A sealing device disposed on the annular end surface side of the plurality of rolling elements in the axial direction;
A magnetized rubber attached to the sealing device;
The sealing device includes:
A cored bar fixed to the outer ring;
A seal rubber bonded to the core;
A first slinger fixed to the inner ring;
A second slinger disposed with a gap between the first slinger and the first slinger,
The first slinger is
A cylindrical portion in contact with the outer peripheral surface and extending in the axial direction;
An annular plate part connected to the cylindrical part, spreading outward in the radial direction, and attached with the magnetized rubber;
The cylindrical portion is
A first inner cylindrical portion that is in contact with the outer peripheral surface and has one end in the axial direction located outside the annular end surface in the axial direction;
Connected to the other end in the axial direction of the first inner cylinder part, located on the outer side in the radial direction than the first inner cylinder part, one end in the axial direction is connected to the annular plate part, Including a first outer cylinder portion having a length in the axial direction shorter than the first inner cylinder portion,
The second slinger is
A second outer cylindrical portion that is located outside the first inner cylindrical portion in the radial direction and is spaced apart from the first inner cylindrical portion in the radial direction;
A second inner cylinder portion that is located inside the first inner cylinder portion in the radial direction and is disposed with a gap between the first inner cylinder portion in the radial direction;
One end in the axial direction of the second outer cylindrical portion and one end in the axial direction of the second inner cylindrical portion are connected, and a gap is provided between the first inner cylindrical portion in the axial direction. A hub unit comprising an annular connection arranged in The hub unit according to claim 1,
The second slinger is a hub unit arranged at a constant velocity joint fixed to the inner shaft. The hub unit according to claim 1,
The second slinger is a hub unit disposed on the inner ring. The hub unit according to claim 3,
The outer peripheral surface is
A first outer peripheral surface with which the first inner cylindrical portion is in contact;
A second outer peripheral surface that is closer to the annular end surface than the first outer peripheral surface in the axial direction and that is positioned inward of the first outer peripheral surface in the radial direction and is in contact with the second inner cylindrical portion. Including a hub unit. A metal core fixed to the outer ring of the hub unit;
A seal rubber bonded to the core;
A first slinger fixed to an inner ring of the hub unit;
A second slinger that is disposed with a gap between the first slinger and is fixed to a member attached to an inner shaft of the hub unit;
The first slinger is
A cylindrical portion in contact with the outer peripheral surface of the inner ring and extending in the axial direction of the inner ring;
An annular plate portion connected to the cylindrical portion and extending outward in the radial direction of the inner ring,
The cylindrical portion is
A first inner cylinder portion that is in contact with the outer peripheral surface and has one end in the axial direction located outside an end surface on one end side in the axial direction of the inner ring;
Connected to the other end in the axial direction of the first inner cylinder part, located on the outer side in the radial direction than the first inner cylinder part, one end in the axial direction is connected to the annular plate part, Including a first outer cylinder portion having a length in the axial direction shorter than the first inner cylinder portion,
The second slinger is
A second outer cylindrical portion that is located outside the first inner cylindrical portion in the radial direction and is spaced apart from the first inner cylindrical portion in the radial direction;
A second inner cylinder portion that is located inside the first inner cylinder portion in the radial direction and is disposed with a gap between the first inner cylinder portion in the radial direction;
One end in the axial direction of the second outer cylindrical portion and one end in the axial direction of the second inner cylindrical portion are connected, and a gap is provided between the first inner cylindrical portion in the axial direction. A sealing device including an annular connection arranged in a row.

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