JP2009241614A - Wheel bearing device - Google Patents

Abstract

There is provided a wheel bearing device capable of preventing water from entering a gap between meshing portions of both male and female splines between a hub shaft of a hub wheel and a central shaft of an outer ring of a constant velocity joint.
A female spline 90 formed in the axial direction of an inner peripheral surface of a central shaft 14 of a hub shaft 13 of a hub wheel 10 to which a wheel is attached, and a central shaft 62 projecting from an end surface of an outer ring 60 of a constant velocity joint 50. The male spline 80 formed in the outer peripheral surface axial direction is spline-fitted. A seal layer 101 made of an anaerobic sealant 101a that seals the gap between the meshing portions is provided at the meshing portions of both the male and female splines 80 and 90.
[Selection] Figure 1

Description

  The present invention relates to a wheel bearing device in which a center hole of a hub shaft of a hub wheel to which a wheel is attached and a center shaft protruding from an end face of an outer ring of a constant velocity joint are spline-fitted.

This type of wheel bearing device is disclosed in Patent Document 1, for example.
In this, a female spline is formed in the inner peripheral surface axial direction of the center hole of the hub shaft of the hub wheel, and the female spline corresponds to the outer peripheral surface axial direction of the central shaft protruding from the end surface of the outer ring of the constant velocity joint. A male spline is formed.
Then, the female spline of the hub shaft of the hub wheel and the male spline of the central shaft of the outer ring of the constant velocity joint are engaged and fitted to be able to transmit torque, and the cylindrical portion at the tip of the central shaft is By caulking radially outward along the end surface of the hub shaft to form a caulking portion, the outer ring of the constant velocity joint and the hub shaft are integrally connected.
JP 2001-301407 A

By the way, in the above-described wheel bearing device, the fastening portion (the caulking portion and the fastening nut portion) that connects the hub shaft and the central shaft of the constant velocity joint is located on the outer side in the vehicle width direction. It becomes the part which is easy to be attacked.
If water inadvertently enters from a slight gap in the fastening part, this water may be sucked into the gap between the female spline of the hub axle and the male spline of the central axis of the outer ring of the constant velocity joint due to capillary action. is expected.
If water enters the meshing part of both male and female splines, the meshing part may rust or water may roll into the bearing.

  In view of the above problems, an object of the present invention is to prevent water from entering the gap between the meshing portions of both male and female splines between the hub axle of the hub wheel and the central axis of the outer ring of the constant velocity joint. It is to provide a wheel bearing device.

To achieve the above object, a wheel bearing device according to a first aspect of the present invention includes a female spline formed in the axial direction of the inner peripheral surface of the center hole of the hub shaft of the hub wheel to which the wheel is attached, and a constant velocity. A bearing device for a wheel in which a male spline formed in the outer peripheral surface axial direction of the central shaft protruding from the end face of the outer ring of the joint is spline-fitted,
A seal layer made of an anaerobic sealant that seals the gap between the meshing portions is provided at the meshing portions of both the male and female splines.

  According to the above configuration, the gap between the meshing portions of both the male and female splines between the hub axle of the hub wheel and the center axis of the outer ring of the constant velocity joint is sealed by the seal layer made of an anaerobic sealant. Unexpected intrusion can be prevented.

  Next, the best mode for carrying out the present invention will be described with reference to examples.

Example 1
A first embodiment of the present invention will be described with reference to FIGS.
1 is a longitudinal sectional view showing a wheel bearing device according to Embodiment 1 of the present invention. FIG. 2 is an explanatory view showing meshing portions of both male and female splines between the hub shaft of the hub wheel and the central shaft of the outer ring of the constant velocity joint. FIG. 3 is a longitudinal sectional view showing a state where the hub wheel and the constant velocity joint are separated.

As illustrated in FIG. 1, the wheel bearing device according to the first embodiment includes a hub wheel 10, a double row angular ball bearing 20 as a rolling bearing, and a constant velocity joint 50. As the constant velocity joint 50, a well-known constant velocity joint called a Zepper type or a bar field type is used, and an inner ring 52 integrally connected to an outer peripheral surface of one end of the drive shaft 51, an outer ring 60, The plurality of balls 53 disposed between the inner and outer rings 52 and 60 and a holder 54 for holding the plurality of balls 53 are provided.
Further, a central shaft 62 for connecting the hub wheel 10 and the constant velocity joint 50 integrally is projected at the center of the end wall portion 61 of the outer ring 60 of the constant velocity joint 50. A cylindrical portion 67 for forming a caulking portion 68 is formed at the distal end portion of the central shaft 62.

  The hub wheel 10 integrally has a cylindrical hub shaft 13 and a flange 11 formed on the outer peripheral surface near one end of the hub shaft 13. A plurality of hub bolts 12 for attaching a wheel (not shown) with a brake rotor (not shown) interposed therebetween are fixed to the flange 11 at a predetermined pitch and by press-fitting.

  The outer ring 30, a plurality of balls 41, 42 as rolling elements and the cages 45, 46 are straddled across the outer peripheral surface of the hub axle 13 of the hub wheel 10 and the outer peripheral surface of the end wall portion 61 of the outer ring 60 of the constant velocity joint 50. The double row angular ball bearing 20 provided is assembled.

  That is, in the third embodiment, a raceway surface 22 corresponding to one raceway surface 31 of the outer ring 30 is formed on the outer peripheral surface near the flange 11 of the hub shaft 13, and the end wall of the outer ring 60 of the constant velocity joint 50 is formed. A raceway surface 23 corresponding to the other raceway surface 32 of the outer ring 30 is formed on the outer peripheral surface of the portion 61.

Further, in order to spline-fit the hub axle 13 of the hub wheel 10 and the outer ring 60 of the constant velocity joint 50 so as to be able to transmit torque, the axial direction of the inner peripheral surface of the center hole 14 penetrating in the center of the hub axle 13 A female spline 90 is formed, and a male spline 80 corresponding to the female spline 90 is formed in the axial direction of the central axis 62 of the outer ring 60 of the constant velocity joint 50.
Of these male and female splines 80, 90, one spline, for example, each spline tooth constituting the male spline 80 is helical with an appropriate lead angle set in the circumferential direction and extends in the axial direction. ing.
Moreover, each spline tooth | gear which comprises the female spline 90 as the other spline is extended in parallel with the axial direction.

  Then, the male spline 80 of the central shaft 62 of the outer ring 60 of the constant velocity joint 50 is inserted and engaged with the female spline 90 of the central hole 14 of the hub shaft 13 of the hub wheel 10, and then the spline fitting is performed. The cylindrical portion 67 at the distal end is caulked radially outward along the outer end face of the hub shaft 13 to form a caulking portion 68, whereby the hub shaft 13 and the outer ring 60 of the constant velocity joint 50 are torqued. It is fastened integrally so that transmission is possible.

A seal layer 101 made of an anaerobic sealant 101a is provided at the meshing portion of the male spline 80 of the outer ring 60 of the constant velocity joint 50 and the female spline 90 of the hub shaft 13 to seal the gap between the meshing portions. .
In addition, before the male and female splines 80 and 90 are spline-fitted, the seal layer 101 is preliminarily provided with at least one of the splines 80 and 90, in this embodiment, the male spline 80. The seal layer 101 is provided by applying the anaerobic sealant 101a to the entire surface from the bottom surface to the top surface of each spline tooth.

The wheel bearing device according to the first embodiment is configured as described above.
Therefore, the gap between the meshing portions of the male spline 80 of the outer ring 60 of the constant velocity joint 50 and the female spline 90 of the hub shaft 13 is sealed by a seal layer 101 made of an anaerobic sealant 101a as shown in FIG. The For this reason, suppose that water passes through the slight gap between the caulking portion 68 and the hub shaft 13 from the peripheral portion of the caulking portion 68 as a fastening portion that connects the hub shaft 13 and the central shaft 62 of the constant velocity joint 50. Even if it intrudes unexpectedly, the seal layer 101 can prevent intrusion into the meshing portions (fitting portions) of both male and female splines 80 and 90 located on the far side.
As a result, it is possible to prevent the meshing portions of both the male and female splines 80 and 90 from rusting or inadvertently entering water into the angular ball bearing 20 as a rolling bearing.
Further, since the seal layer 10 made of an anaerobic sealant does not contain a volatile solvent component, the thinning phenomenon at the time of curing hardly occurs and the waterproof property can be maintained for a long period of time.

Further, in the wheel bearing device according to the first embodiment, as shown in FIG. 4, a metal or synthetic resin cover member 110 is formed on the cylindrical portion 11 a that protrudes from the outer side surface of the flange 11 of the hub wheel 10. It is possible to perform double sealing (waterproofing) by press-fitting and mounting.
Further, as shown in FIG. 5, before the caulking portion 68 is formed by caulking the cylindrical portion 67 provided at the distal end portion of the central shaft 62 of the outer ring 60 of the constant velocity joint 50 radially outward, the hub shaft 13 A double seal (waterproofing) is performed by attaching an O-ring 111 made of an elastic body at the opening end portion of the center hole 14 on the vehicle outer side to the boundary portion with the cylindrical portion 67 at the tip end of the center shaft 62. You can also.
Further, as shown in FIG. 6, before forming the caulking portion 68 by caulking the cylindrical portion 67 provided at the distal end portion of the center shaft 62 of the outer ring 60 of the constant velocity joint 50 radially outward, the hub shaft 13 A double seal (waterproofing) is performed by attaching an annular packing 112 made of an elastic body to an opening end portion of the center hole 14 on the vehicle outer side at a boundary portion with the cylindrical portion 67 at the tip end of the center shaft 62. You can also.

(Example 2)
Next, a second embodiment of the present invention will be described with reference to FIG.
FIG. 7 is a longitudinal sectional view showing a wheel bearing device according to Embodiment 2 of the present invention.
As shown in FIG. 7, in the wheel bearing device according to the second embodiment, an outer ring 230, an inner ring 221, a plurality of balls 241 and 242 as rolling elements, and a cage are provided on the outer periphery of the hub shaft 213 of the hub wheel 210. A double row angular ball bearing 220 with 245, 246 is assembled.

Further, a male screw portion 263 is formed at the tip of the central shaft 262 protruding from the end wall portion 261 of the outer ring 260 of the constant velocity joint 250, and the male screw portion 263 is caulked to prevent the tightening nut 265 from rotating. A groove 264 is recessed.
Then, a female spline 290 formed in the axial direction of the inner peripheral surface of the center hole 214 penetrating through the center of the hub shaft 213 and an axial direction of the outer peripheral surface of the central shaft 262 of the outer ring 260 of the constant velocity joint 250 are formed. After the male spline 280 is spline-fitted, the fastening nut 265 is fastened to the male screw portion 263 of the central shaft 262, and then a part of the thin portion 266 at the end of the fastening nut 265 is caulked in the male screw portion 263. The hub shaft 213 and the outer ring 260 of the constant velocity joint 250 are fastened together so as to transmit torque by being caulked in the H.264 and being prevented from rotating.

Further, the mesh portion (fitting portion) between the male spline 280 of the outer ring 260 of the constant velocity joint 250 and the female spline 290 of the hub shaft 213 is a seal made of an anaerobic sealant 301a that seals the gap between the mesh portions. Layer 301 is provided as in Example 1.
Therefore, also in the wheel bearing device according to the second embodiment, a slight gap between the tightening nut 265 and the male screw portion 263 as a fastening portion that connects the hub shaft 213 and the central shaft 262 of the constant velocity joint 250. Even if water inadvertently enters through the sealing layer 101, the sealing layer 101 can prevent the male and female splines 280, 290 located on the far side of the water from entering.
As a result, it is possible to prevent the meshing portions of both the male and female splines 280 and 290 from rusting or inadvertently entering water into the angular ball bearing 220 as a rolling bearing.
Further, in the second embodiment, as shown in FIG. 7, the cover member 210 made of metal or synthetic resin is press-fitted and attached to the cylindrical portion 211 a protruding from the vehicle outer side surface of the flange 211 of the hub wheel 210. Can also be double sealed (waterproof).

The present invention is not limited to the first and second embodiments.
For example, in the first and second embodiments, the case where a double-row angular ball bearing is employed as the rolling bearing is illustrated, but the present invention can also be implemented using a double-row tapered roller bearing in addition to the angular ball bearing. It is.

It is a longitudinal cross-sectional view which shows the wheel bearing apparatus which concerns on Example 1 of this invention. It is explanatory drawing which shows the meshing part of both male and female splines with the hub axis | shaft of a hub wheel, and the center axis | shaft of the outer ring | wheel of a constant velocity joint. It is a longitudinal section showing the state where a hub wheel and a constant velocity joint were separated similarly. It is explanatory drawing which shows the embodiment by which the cover member was similarly attached to the cylindrical part protruded on the vehicle outer side surface of the flange of a hub wheel. It is explanatory drawing which shows the embodiment by which the O-ring was interposed in the crimping | crimped part of the center axis | shaft of the outer ring | wheel of a constant velocity joint similarly. It is explanatory drawing which shows the embodiment by which packing was interposed in the crimping part of the center axis | shaft of the outer ring | wheel of a constant velocity joint similarly. It is a longitudinal cross-sectional view which shows the wheel bearing apparatus which concerns on Example 2 of this invention.

Explanation of symbols

10, 210 Hub wheel 11, 211 Flange 13, 213 Hub shaft 14, 214 Center hole 20, 220 Angular contact ball bearing (rolling bearing)
50, 250 Constant velocity joint 60, 260 Outer ring 62, 262 Center shaft 80, 280 Male spline 90, 290 Female spline 101, 301 Seal layer 101a, 301a Anaerobic sealant

Claims (1)

A female spline formed in the axial direction of the inner peripheral surface of the center hole of the hub shaft of the hub wheel to which the wheel is attached, and a male spline formed in the outer peripheral surface axial direction of the central axis protruding from the end surface of the outer ring of the constant velocity joint. Is a spline-coupled wheel bearing device,
The wheel bearing device according to claim 1, wherein a seal layer made of an anaerobic sealant that seals a gap between the engagement portions of the male and female splines is provided.

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