JP2014231870A - Wheel bearing device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a wheel bearing device which can suppress the adhesion of oil adhered to a hub flange to a brake rotor without lowering the durability of a bearing.SOLUTION: A hub unit 20 comprises an outer ring 30, an inner ring 40, and sealing devices 24, 25 which are arranged at an end of an annular space 21 formed between the outer ring 30 and the inner ring 40, seal the annular space 21, and form a bearing internal space 22. A hub flange 41 attached with an outwardly-extending wheel 70 at its one end is formed at the inner ring 40, a brake rotor 10 is arranged at an outside diameter side of the hub flange 41, and grease G is filled in the bearing internal space 22. A protrusion 43 protruding to a vehicle inner side is formed at an external peripheral edge of the hub flange 41, a peripheral groove 44 is formed at an inside diameter side of the protrusion 43, and oil collected in the peripheral groove 44 is stagnated in the peripheral groove 44 by an oil coagulant 60.

Description

  The present invention relates to a wheel bearing device.

  Conventionally, as a wheel bearing device, there is one described in Japanese Patent Publication No. 63-54928 (Patent Document 1).

  This wheel bearing device includes an outer ring fixed to a vehicle, an inner ring having a hub flange connected to an axle and having one end extending in the outer diameter direction, and a rolling element that rolls between the inner and outer rings. A sealing device is attached to an end portion of the annular space between the inner and outer rings to form a sealed bearing inner space. Grease as a lubricant is sealed in the bearing internal space.

  In this wheel bearing device, when the grease base oil leaks out of the bearing internal space from the sliding contact portion of the sealing device, it adheres to the hub flange. To prevent the base oil adhering to the hub flange from splashing radially outward due to the rotation of the hub flange and adhering to the brake rotor that is also radially outward of the hub flange, The device takes the following measures. In the wheel bearing device, a cover plate that covers from the hub flange to the end of the outer ring facing in the axial direction is mounted on the outer periphery of the rotating hub flange, and the cover plate is fixed. It is slightly open to the outer periphery of the end of the outer ring. Thereby, in the wheel bearing device, an annular separation chamber surrounded by the hub flange, the cover plate, the outer ring and the sealing device is formed, and this separation chamber separates the bearing inner space from the bearing outer portion.

Japanese Examined Patent Publication No. 63-54928

  However, in the wheel bearing device described above, the base oil leaking out of the bearing internal space and adhering to the hub flange accumulates in the separation chamber. In the vehicle running state, the muddy water scraped from the road surface by the wheels gradually enters the separation chamber from the opening and accumulates. And the foreign material which the base oil and muddy water which collected in the separation chamber intermingled gave an excessive load to the sealing device, and the wear of the sliding contact portion progressed, causing the durability of the bearing to be lowered. Thus, the wheel bearing device has a problem of reducing the adhesion of oil attached to the hub flange to the brake rotor without reducing the durability of the bearing.

  The present invention has been made to solve such problems, and can reduce the adhesion of oil attached to the hub flange to the brake rotor without reducing the durability of the bearing. It is an object to provide a bearing device for a vehicle.

  In order to solve the above problems, the structural features of the wheel bearing device according to claim 1 are an outer member, an inner member disposed on the inner peripheral side of the outer member, and the outer member. And a sealing device that is disposed at an end portion of the annular space formed between the inner members and seals the annular space to form a bearing inner space, and includes any one of the outer member and the inner member. One of the outer members and the inner member is a fixed wheel that is fixed to the vehicle, and the rotating wheel has a hub that extends in the outer diameter direction and has a wheel attached to the rotating wheel. A flange is formed, and a brake rotor is disposed on an outer diameter side of the hub flange, and a bearing device for a wheel in which a lubricant containing oil is sealed in the bearing inner space, the hub flange is disposed outside the hub flange. Cylindrical protrusions protruding toward the vehicle inner side at the periphery Oil sump means storing the oil on the inner diameter side of the projecting portion is to comprise a.

  According to the wheel bearing device of the first aspect, for example, oil that leaks out from the bearing internal space and adheres to the hub flange is scattered radially outward by the rotation of the hub flange, and is generated at the outer peripheral edge of the hub flange. Since the oil collects in the formed protrusion and is accumulated by the oil reservoir means provided on the inner diameter side of the protrusion, it is possible to reduce the oil adhering to the hub flange from adhering to the brake rotor. Further, according to this wheel bearing device, only oil is collected by the oil reservoir means, and muddy water scooped up from the road surface by the wheels does not collect in the vicinity of the sealing device, and does not give an excessive load to the sealing device. Therefore, the durability of the bearing is not reduced.

  The wheel bearing device according to claim 2 is characterized in that a circumferential groove is formed on the inner diameter side of the projecting portion, and the oil reservoir means includes an oil coagulant that solidifies and accumulates oil in the circumferential groove. It is adhering.

  According to the wheel bearing device of the second aspect, since the oil collected in the circumferential groove is solidified and collected by the oil coagulant, it is possible to reduce the oil adhering to the hub flange from adhering to the brake rotor.

  The wheel bearing device according to claim 3 is characterized in that a circumferential groove is formed on an inner diameter side of the protruding portion, and the oil reservoir means includes an oil absorbing member that absorbs and accumulates oil in the circumferential groove. It is wearing.

  According to the wheel bearing device of the third aspect, since the oil collected in the circumferential groove is absorbed and collected by the oil absorbing member, it is possible to reduce the oil adhering to the hub flange from adhering to the brake rotor.

  ADVANTAGE OF THE INVENTION According to this invention, the bearing apparatus for wheels which can reduce that the oil adhering to a hub flange adheres to a brake rotor can be provided, without reducing the durability of a bearing.

It is sectional drawing of the state which attached the wheel bearing apparatus which is one Embodiment of this invention to the vehicle. It is the A section enlarged view of FIG.

DESCRIPTION OF EMBODIMENTS Hereinafter, an embodiment in which a wheel bearing device of the present invention is embodied will be described with reference to the drawings.
FIG. 1 is a cross-sectional view of a state in which a wheel bearing device according to an embodiment of the present invention is attached to a vehicle. FIG. 2 is an enlarged view of part A in FIG. This will be described with reference to FIGS. In the following description, the vehicle inner side is the axle side and indicates the left side in the following drawings, and the vehicle outer side is the side on which the wheels are attached and the right side in the following drawings.

  As shown in FIG. 1, the hub unit 20 (wheel bearing device) is, for example, for a drive wheel, and has a double-row outward angular ball bearing structure. Specifically, the hub unit 20 includes an outer ring 30 (outer member) attached to a knuckle 51 that is a vehicle side member on the vehicle inner side, and an inner ring 40 (inner member) disposed on the inner diameter side of the outer ring 30. A double row ball 23 that rolls in the annular space 21 formed between the outer ring 30 and the inner ring 40, and sealing devices 24 and 25 that are attached to both ends of the annular space 21 are provided.

  A vehicle mounting flange portion 31 that protrudes radially outward is formed on the outer peripheral surface of the outer ring 30. The vehicle attachment flange 31 is attached to the knuckle 51 with a bolt 52. As a material of the outer ring 30, for example, high carbon steel “S55C” is used.

  A constant velocity joint 50 and an inner ring 40 connected to an axle (not shown) are fastened by a fastening member 53 that is spline-fitted to the inner periphery of the inner ring 40.

  A hub flange 41 protruding outward in the radial direction is formed on the outer peripheral surface of the inner ring 40 on the vehicle outer side. The hub flange 41 is provided with mounting holes 41a penetrating in the axial direction at several locations in the circumferential direction. A bolt 42 is press-fitted and fixed to the mounting hole 41a from the vehicle inner side. The wheel 70 and the brake rotor 10 are attached to the hub flange 41 via bolts 52. As a material of the inner ring 40, for example, high carbon steel “S55C” is used.

  The brake rotor 10 includes a disk-shaped mounting portion 11, a cylindrical cylindrical portion 12, a disk-shaped flange portion 13, fins 15 equally arranged in the circumferential direction, and a disk-shaped disk portion 14. A mounting portion 11 is integrally formed on the inner periphery of one end of the cylindrical portion 12, and a flange portion 13 is integrally formed on the outer periphery of the other end of the cylindrical portion 12. Fins 15 are disposed between the flange portion 13 and the disk portion 14, and these are integrally formed with each other to constitute a friction portion 16. A through hole 11a is formed in the mounting portion 11 at a position corresponding to the mounting hole 41a so as to penetrate in the axial direction. Bolts 42 are inserted through the through holes 11 a and the brake rotor 10 is attached to the hub flange 41.

  This brake, called a disc brake, performs braking by sandwiching the friction portion 16 from both sides with a brake pad (not shown) that is a friction material. In a state where the brake rotor 10 is attached to the hub flange 41, the friction portion 16 is disposed radially outward of the hub flange 41.

  The hub flange 41 is formed with a cylindrical projecting portion 43 projecting toward the vehicle inner side at the outer peripheral edge portion, and a circumferential groove 44 is formed on the inner diameter side of the projecting portion 43 over the entire circumference. The protrusion 43 protrudes further toward the vehicle inner side than the head of the bolt 42. For example, an oil coagulant 60 (oil sump means) mainly composed of a high molecular polymer is integrally attached to the circumferential groove 44.

  An annular sealing device 24 is attached to the annular space 21 on the vehicle outer side, and an annular sealing device 25 is attached to the vehicle inner side. The sealing device 24 and the sealing device 25 constitute a bearing inner space 22 that is sealed in a state in which relative rotation between the outer ring 30 and the inner ring 40 is allowed. The sealing device 24 is press-fitted and fixed to the inner peripheral surface of the outer ring 30, and is configured such that a lip (not shown) made of an elastic body is in sliding contact with the outer peripheral surface of the inner ring 40. Grease G as a lubricant is sealed in the bearing internal space 22.

  In the hub unit 20 configured as described above, the base oil of the grease G in the bearing internal space 22 leaks from the sliding contact portion of the sealing device 24 and adheres to the side surface 45 of the hub flange 41 on the vehicle inner side. The adhering base oil G1 scatters radially outward as indicated by an arrow FL by the rotation of the hub flange 41 and collects in the circumferential groove 44 formed at the outer peripheral edge of the hub flange 41. On the other hand, when the vehicle is stopped, it moves along the side surface 45 and moves downward in the vertical direction as indicated by the arrow FL, and dripping into the circumferential groove 44. Further, the rust preventive oil applied to the hub unit 20 in the manufacturing / assembling process gathers in the circumferential groove 44 in the same manner as the base oil G1 adhered to the side surface 45 of the hub flange 41. The oil collected in the circumferential groove 44 in this way is solidified by the oil coagulant 60 and collected.

  Thereby, in the hub unit 20, the oil adhering to the hub flange 41 is collected in the circumferential groove 44 and solidified and collected, so that the oil adhering to the hub flange 41 can be reduced from adhering to the brake rotor 10.

Further, in the hub unit 20, only oil is solidified by the oil coagulant 60 and collected in the circumferential groove 44, and muddy water scraped up from the road surface by the wheel 70 does not collect in the vicinity of the sealing device 24, and the sealing device 24 is excessive. Therefore, the durability of the bearing is not deteriorated.

In addition, this invention is not limited to this embodiment, In the range which does not deviate from the summary of this invention, it can implement with a various form.
In the above embodiment, the configuration of the drive wheel has been described. However, the present invention is naturally applicable to a driven wheel.

  In the above-described embodiment, the configuration of the inner ring rotation has been described. However, the present invention is naturally applicable to the configuration of the outer ring rotation.

  In the above-described embodiment, the hub flange 41 has the circumferential groove 44 on the inner diameter side of the protruding portion 43. However, the present invention is not limited to this. The oil coagulant 60 may be applied to the structure.

  In the above embodiment, the oil reservoir means attaches the oil coagulant 60 to the circumferential groove 44 and solidifies and accumulates the oil. However, the present invention is not limited to this. It may be applied to a configuration in which an oil absorbing member having the above is mounted and oil is absorbed and stored.

10: Brake rotor, 11: Mounting portion, 11a: Through hole, 12: Cylindrical portion, 13: Flange portion, 14: Disc portion, 15: Fin, 16: Friction portion, 20: Hub unit (wheel bearing device), 21: annular space, 22: bearing inner space, 23: ball, 24, 25: sealing device, 30: outer ring (outer member), 31: vehicle mounting flange, 40: inner ring (inner member), 41: hub Flange, 41a: mounting hole, 42: bolt, 43: protrusion, 44: circumferential groove, 45: side surface, 50: constant velocity joint, 51: knuckle, 52: bolt, 53: fastening member, 60: oil coagulant ( 70: Wheel, FL: Flow of oil, G: Grease, G1: Base oil (oil)

Claims (3)

An outer member, an inner member disposed on the inner peripheral side of the outer member, and an end portion of an annular space formed between the outer member and the inner member, and sealing the annular space And a sealing device that forms a bearing internal space,
Either one of the outer member and the inner member is a rotating wheel, and one of the outer member and the inner member is a fixed wheel fixed to the vehicle,
The rotating wheel is formed at one end thereof with a hub flange extending in the outer diameter direction and mounting the wheel, and on the outer diameter side of the hub flange, a brake rotor is disposed,
A wheel bearing device in which a lubricant containing oil is sealed in the bearing internal space,
The hub flange includes a cylindrical projecting portion projecting toward the vehicle inner side at an outer peripheral edge portion thereof, and oil reservoir means for collecting oil on an inner diameter side of the projecting portion. A circumferential groove is formed on the inner diameter side of the protrusion,
2. The wheel bearing device according to claim 1, wherein the oil reservoir means adheres an oil coagulant that solidifies and accumulates oil to the circumferential groove. 3. A circumferential groove is formed on the inner diameter side of the protrusion,
2. The wheel bearing device according to claim 1, wherein the oil reservoir includes an oil absorbing member that absorbs and stores oil in the circumferential groove. 3.

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