JP2013213571A - Method of manufacturing rolling bearing device for wheel - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a method of manufacturing a rolling bearing device for a wheel, in which a seal unit can be properly fitted (press-fitted) to between an outer ring member and an inner ring member in the rolling bearing device for the wheel so that grease base oil or the like in a rolling element housing space can be prevented from seeping outside from the inside of the rolling element housing space.SOLUTION: In a method of manufacturing a rolling bearing device A for a wheel, which has inner ring members 1, 40, an outer ring member 50, and a plurality of rolling elements housed in a space (rolling element housing space) between the inner ring members and the outer ring member, a first seal unit 71 for sealing between the inner ring members and the outer ring member is fitted to an end surface on one side in an axial direction in the space (rolling element housing space), and further a second seal unit 75 for sealing between the inner ring members and the outer ring member, in a previously decompressed work space 91 is fitted to an end surface on the other side in the axial direction in the space (rolling element housing space).

Description

  The present invention relates to a method for manufacturing a rolling bearing device for a wheel.

A rolling bearing device for wheels (so-called hub unit for wheels) is provided with a seal unit (in order to prevent muddy water and foreign matter from entering the rolling element housing space between the inner ring member and the outer ring member due to rough road traveling or the like. Sealing device) is fitted between the inner ring member and the outer ring member at both axial ends of the rolling element housing space.
For example, in the prior art described in Patent Document 1, a seal unit is constituted by a core metal and a seal lip member having a characteristic shape, and the sealability of the metal contact portion is improved while the structure is simple, An annular sealing device that can cope with the above-mentioned geometric characteristics is disclosed.
In the prior art described in Patent Document 2, a metal ring made of a non-rusting material is fitted to the outer peripheral surface of the inner ring member, and a seal member in which a core metal and a seal lip are integrated is fitted to the outer ring member, The seal lip of the member is in sliding contact with the metal ring. This structure ensures sealing and maintains sealing performance for a long period.

JP 2010-230150 A JP 2005-291485 A

In the prior art described in Patent Document 1 and Patent Document 2, one end and the other in the axial direction in the rolling element housing space that is a cylindrical space between the inner ring member and the outer ring member in which a plurality of rolling elements are accommodated. The end can be securely sealed with a seal unit. However, when this sealing unit is fitted (press-fitted) to seal the rolling element accommodation space, the rolling element accommodation space is compressed by the volume of the fitted seal unit, and the pressure in the rolling element accommodation space is reduced. It becomes higher than the pressure outside the space (= atmospheric pressure). In addition, since the sealed state is maintained by the seal unit, the increased pressure is maintained in the rolling element housing space. For example, fluid such as grease base oil (lubricating oil) filled in the rolling element housing space over a long period of time may cause a slight gap between the seal unit and the inner ring member or a slight gap between the seal unit and the outer ring member due to a pressure difference. May ooze out.
The present invention was devised in view of such points, so that the grease base oil or the like in the rolling element housing space can be further suppressed from oozing out from the rolling element housing space. It is an object of the present invention to provide a method for manufacturing a wheel rolling bearing device, in which a seal unit can be appropriately fitted (press-fitted) between an outer ring member and an inner ring member in the wheel rolling bearing device.

In order to solve the above problems, the method for manufacturing a rolling bearing device for a wheel according to the present invention takes the following means.
The first invention of the present invention includes an inner ring member, an outer ring member disposed on the outer peripheral side of the inner ring member and coaxially with the inner ring member, and a plurality of pieces accommodated in a space between the inner ring member and the outer ring member. A rolling bearing device for a wheel having a rolling element, wherein a first seal unit seals a gap between the inner ring member and the outer ring member on an end face on one side in the axial direction in the space. And a second seal unit that seals between the inner ring member and the outer ring member in a work space that has been previously depressurized, is fitted into the end face on the other axial side in the space.

According to the first aspect of the invention, since the second seal unit is fitted in a state where the pressure is lower than the atmospheric pressure, the increase in pressure in the space (rolling element housing space) compressed by the fitting is reduced. Can be offset.
Therefore, after taking out the wheel rolling bearing device from the work space, it is possible to prevent the grease base oil or the like from seeping out to the outside.

  Next, a second invention of the present invention is a method of manufacturing a wheel rolling bearing device according to the first invention, wherein the pressure in the space where the second seal unit is fitted and compressed is substantially equal. In this method, the pressure in the work space is reduced so as to be atmospheric pressure.

According to the second aspect of the present invention, when the wheel rolling bearing device is taken out from the work space into the atmospheric pressure after the second seal unit is fitted, the pressure in the sealed space (the rolling element housing space), There is almost no pressure difference between the pressure outside the space (the rolling element housing space).
Thereby, the pressure difference between the space (rolling element accommodation space) and the outside of the space (rolling element accommodation space) can be eliminated, so that the grease base oil or the like in the space (rolling element accommodation space) can be removed from the space (rolling element accommodation space). It is possible to further suppress oozing from the inside to the outside.

An inner ring member (shaft member 1 and inner ring 40), an outer ring member (outer ring 50), a first rolling element unit 61, a second rolling element unit 65, a first seal unit 71, and a second seal unit 75 are wheel rolling bearing devices. It is an axial direction sectional view (sectional view along a rotation axis ZC) showing a state assembled as A. (A) is an axial sectional view of the inner ring member (shaft member 1 and inner ring 40), and (B) is an axial sectional view of the outer ring member (outer ring 50). It is a figure explaining each process of assembling the rolling bearing device A for wheels, (A) is a figure explaining the process of assembling the outer ring 50 to the shaft member 1, and (B) is a figure explaining the process of assembling the inner ring 40. (C) is a figure explaining the process of assembling the 2nd seal unit 75, (D) is a figure explaining the rolling bearing device A for wheels in which the assembly was completed. It is a figure explaining a mode that rolling element accommodation space K1 shown by a thick dotted line is compressed by the assembly of the 2nd seal unit 75. It is a figure explaining a mode that the work space 91 is pressure-reduced and assembled | attached when the 2nd seal unit 75 is assembled | attached.

Embodiments of the present invention will be described below with reference to the drawings.
● [Whole rolling bearing device A overall structure (Figs. 1 and 2)]
First, the overall structure of the wheel rolling bearing device A will be described with reference to FIGS. 1 and 2. FIG. 1 shows an axial cross-sectional view (cross-sectional view along the rotation axis ZC) of the wheel rolling bearing device A, and FIG. 2 (A) is an axial cross-sectional view of the inner ring member (the shaft member 1 and the inner ring 40). FIG. 2B is an axial sectional view of the outer ring member (outer ring 50).
As shown in FIG. 1, the wheel rolling bearing device A includes an inner ring member (shaft member 1 and inner ring 40), an outer ring member (outer ring 50), a first rolling element unit 61, a second rolling element unit 65, The first seal unit 71 and the second seal unit 75 are assembled and configured.
When the wheel rolling bearing device A is attached to the vehicle, the inner ring 40 is located on the inner side of the vehicle, the hub bolt B protrudes toward the outer side of the vehicle, and in FIG. The right direction of the page indicates the outside of the vehicle.

As shown in FIG. 2, the shaft member 1 includes a shaft portion 10, a flange portion 20, and a fitting shaft portion 30 that are coaxially formed with respect to the rotation axis ZC.
A large diameter shaft portion 11 having a large diameter is formed on the side close to the flange portion 20 in the shaft portion 10, and a small diameter shaft having a smaller diameter than the large diameter shaft portion 11 is formed on the side far from the flange portion 20 in the shaft portion 10. Part 12 is formed.
Further, an inner ring abutting surface 12A, which is a surface orthogonal to the rotation axis ZC, is formed at the stepped portion that becomes the boundary between the large diameter shaft portion 11 and the small diameter shaft portion 12.
The large-diameter shaft portion 11 is formed with a first inner ring raceway surface 18 that is a raceway surface of the first rolling element 62 and a seal surface 19 in which the lip of the first seal unit 71 is in sliding contact.
The first inner ring raceway surface 18 is formed on a part of the outer peripheral surface in the vicinity of the boundary portion with the flange portion 20 in the large-diameter shaft portion 11, and is one bearing in a double row angular ball bearing as a rolling bearing. It forms so that a circumferential direction may be continued so that a part may be comprised.
The seal surface 19 is formed on a part of the outer peripheral surface adjacent to the first inner ring raceway surface 18 and close to the flange portion 20 so as to be continuous in the circumferential direction.
Further, the inner ring 40 is fitted on the outer peripheral surface of the small-diameter shaft portion 12 until it abuts against the inner ring abutting surface 12A.
The inner ring 40 is press-fitted with a second inner ring raceway surface 44 formed to be continuous in the circumferential direction, an abutting facing surface 42 facing the inner ring abutting surface 12A, and a core metal 76 of the second seal unit 75. The outer peripheral surface 41 is fitted into the small diameter shaft portion 12.

The flange portion 20 is positioned between the shaft portion 10 and a fitting shaft portion 30 described later, and is formed to extend in the radial direction toward the outside. In addition, the extending part in the flange part 20 may be formed in a plurality of extending parts radially in the radial direction toward the outer side, or may be formed in a disk shape in the radial direction toward the outer side.
The flange portion 20 is provided with a plurality of bolt holes 24 through which hub bolts B for tightening the wheels are arranged by press fitting.
Further, a surface around the center hole of the brake rotor (not shown) abuts on the rotor support surface 22 which is the surface of the flange portion 20 on the side of the fitting shaft portion 30.
The fitting shaft portion 30 is formed on one end side of the shaft member 1 and is formed in a substantially cylindrical shape that is continuous in the circumferential direction. And the fitting shaft part 30 is engage | inserted by the center hole of a wheel (illustration omitted).
Also, the fitting shaft portion 30 is formed with a brake rotor fitting portion 31 on the side closer to the flange portion 20, and on the side far from the flange portion 20, a fitting for a wheel having a slightly smaller diameter than the brake rotor fitting portion 31 is formed. A portion 32 is formed.
A concave portion 35 is formed on the inner diameter side of the fitting shaft portion 30.

An outer ring 50 is disposed on the outer peripheral side of the inner ring member constituted by the shaft member 1 and the inner ring 40 while maintaining an annular space.
On the inner peripheral surface of the outer ring 50, the first outer ring raceway surface 51 facing the first inner ring raceway surface 18 formed on the shaft member 1 and the second inner ring raceway surface 44 formed on the inner ring 40 are opposed. A second outer ring raceway surface 52 is formed. Each inner ring raceway surface and each outer ring raceway surface are formed to be continuous in the circumferential direction on each surface.
The first rolling element unit 61 includes a plurality of first rolling elements 62 and a holder 63 that holds the first rolling elements 62 at equal intervals.
The second rolling element unit 65 includes a plurality of second rolling elements 66 and a holder 67 that holds the second rolling elements 66 at equal intervals.
And between the 1st inner ring raceway surface 18 and the 1st outer ring raceway surface 51, the 1st rolling element 62 of the 1st rolling element unit 61 is arranged so that rolling is possible. Further, the second rolling element 66 of the second rolling element unit 65 is arranged between the second inner ring raceway surface 44 and the second outer ring raceway surface 52 so as to be able to roll.

A vehicle body side flange 55 is integrally formed on the outer peripheral surface of the outer ring 50, and the vehicle body side flange 55 is attached to a vehicle body side member such as a knuckle or a carrier supported by a vehicle suspension device (not shown). Fastened to the surface with bolts or the like.
Further, as shown in FIGS. 1 and 2, the first seal unit 71 is attached to the seal surface 19 by being attached so as to be integrated with the core metal 72 and the core metal 72 pressed into the inner peripheral surface 53 of the outer ring 50. On the other hand, it is comprised by the sealing member 73 (elastic member) which has the lip which touches a radial direction, and the lip which touches a thrust direction. The first seal unit 71 seals the space between the inner ring member (shaft member 1) and the outer ring member (outer ring 50) on one end face in the axial direction in the rolling element housing space K1 (see FIG. 4). To do.
As shown in FIGS. 1 and 2, the second seal unit 75 includes a core metal 76 that is press-fitted into the outer peripheral surface 41 of the inner ring 40, a core metal 77 that is press-fitted into the inner peripheral surface 54 of the outer ring 50, and a core. The seal member 78 (elastic member) is attached so as to be integrated with the metal 77 and has a lip that contacts the core metal 76 in the radial direction and a lip that contacts the thrust direction. The second seal unit 75 seals the space between the inner ring member (inner ring 40) and the outer ring member (outer ring 50) at the end surface on the other axial side in the rolling element housing space K1 (see FIG. 4). .
A cored bar 72 of the first seal unit 71 is press-fitted and assembled to the inner peripheral surface 53 of the opening adjacent to the first outer ring raceway surface 51 in the outer ring 50. The tip of the lip of the seal member 73 of the first seal unit 71 is in sliding contact (contact) with the seal surface 19 to seal the gap between the outer ring 50 (outer ring member) and the shaft member 1 (inner ring member). Yes.
A core metal 77 of the second seal unit 75 is press-fitted into the inner peripheral surface 54 of the opening adjacent to the second outer ring raceway surface 52 in the outer ring 50, and is inserted into the second inner ring raceway surface 44 in the inner ring 40 (inner ring member). A core metal 76 of the second seal unit 75 is press-fitted into the adjacent outer peripheral surface 41. The tip of the lip of the seal member 78 of the second seal unit 75 is in sliding contact (contact) with the core metal 76 to seal the gap between the outer ring 50 (outer ring member) and the inner ring 40 (inner ring member). Yes.

● [Conventional assembly method for rolling bearing device A for wheels (Fig. 3)]
3A to 3D, the shaft member 1, the inner ring 40, the outer ring 50, the first seal unit 71, the second seal unit 75, the first rolling element unit 61, and the second rolling element unit 65 are used. The conventional method (the conventional assembling method) for manufacturing the rolling bearing device A for wheels will be described. 3A to 3D show a state after the hub bolt B is press-fitted into the shaft member 1, but before the hub bolt B is press-fitted, each of the parts shown in FIGS. 3A to 3D is shown. You may implement a process.
In the manufacturing method described below, the wheel rolling bearing device A is manufactured through an outer ring assembly process, an inner ring assembly process, and a second seal unit press-fitting process.

[1. Outer ring assembly process (FIG. 3A)]
In the outer ring assembling step, after the first rolling element unit 61 is arranged on the first outer ring raceway surface 51 (see FIG. 2B), the first seal unit 71 is press-fitted into the inner peripheral surface 53 (see FIG. 2B). This is a step of fitting the outer ring 50 from the small diameter shaft portion 12 side of the shaft member 1. When the outer ring 50 is fitted, the first rolling element 62 includes a first inner ring raceway surface 18 formed on the outer peripheral surface of the large-diameter shaft portion 11 and a first outer ring raceway formed on the inner peripheral surface of the outer ring 50. It is held between the surface 51 so as to be able to roll. Further, the lip portion of the seal member 73 (see FIG. 1) of the first seal unit 71 contacts the seal surface 19.

[2. Inner ring assembly process (FIG. 3B)]
The inner ring assembly step includes an inner ring in which the second rolling element unit 65 is disposed on the second inner ring raceway surface 44 (see FIG. 2A) from the small-diameter shaft portion 12 side of the shaft member 1 that has completed the outer ring assembly step. This is a step of fitting 40 to a position where it hits the inner ring abutting surface 12A. When the inner ring 40 is fitted, the second rolling element 66 includes a second inner ring raceway surface 44 formed on the outer peripheral surface of the inner ring 40 and a second outer ring raceway surface 52 formed on the inner peripheral surface of the outer ring 50. , So that it can roll.

[3. Second seal unit press-fitting process (FIG. 3C)]
The second seal unit press-fitting step is a step of press-fitting the second seal unit 75 into the gap between the inner ring 40 and the outer ring 50 that has finished the inner ring assembling step. As shown in FIG. 1, the second seal unit 75 includes a cored bar 76 that is press-fitted into the outer peripheral surface 41 (see FIG. 2A) of the inner ring 40 and an inner peripheral surface 54 of the outer ring 50 (FIG. 2B). The metal core 77 press-fitted into the reference) and the seal member 78 that seals between the metal core 76 and the metal core 77 are assembled together. By press-fitting the second seal unit 75, it is possible to simultaneously press-fit the core metal 76 into the inner ring 40 and press-fit the core metal 77 into the outer ring 50.
When the second seal unit press-fitting step is completed, the assembly of the wheel rolling bearing device A is completed as shown in FIG.

● [Problems of conventional assembly methods (Fig. 4) and solutions (Fig. 5)]
The inventor has found out that there is the following problem in the second seal unit press-fitting step in the conventional assembly method described above. Hereinafter, this problem will be described with reference to FIGS. 4A shows an enlarged view around the rolling element housing space K1 (thick dotted line portion in the figure) in a state before the second seal unit 75 is press-fitted, and FIG. The enlarged view of the circumference | surroundings of the rolling element accommodation space K1 (thick dotted line part in a figure) in the state after press-fitting the seal unit 75 is shown.

As shown in FIG. 4A, a first rolling element unit 61 and a second rolling element unit 65 are provided between an inner ring member constituted by the shaft member 1 and the inner ring 40 and an outer ring 50 (outer ring member). Is formed with a rolling element accommodation space K1 (thick dotted line portion in the figure).
The space between the inner ring member and the outer ring member at one end in the axial direction in the rolling element housing space K1 is already sealed with the first seal unit 71. Accordingly, the rolling element housing space K1 shown in FIG. 4A is in a state where only the second seal unit 75 side in the axial direction is open.
When the second seal unit 75 is press-fitted between the outer peripheral surface 41 of the inner ring 40 and the inner peripheral surface 54 of the outer ring 50 in the state shown in FIG. As shown in FIG. 4B, the volume of the rolling element housing space K1 is reduced by ΔV. That is, the rolling element housing space K <b> 1 is sealed by the first seal unit 71 and the second seal unit 75 in a compressed state. Therefore, the pressure in the rolling element housing space K1 after the second seal unit 75 is press-fitted becomes higher than the pressure in the rolling element housing space K1 before the second seal unit 75 is press-fitted.

As described above, when the second seal unit 75 is press-fitted in the atmospheric pressure, the pressure in the rolling element housing space K1 becomes higher than the atmospheric pressure.
In addition, fluid such as grease base oil is stored in the rolling element storage space K1. For example, when a long period of time elapses, the grease base oil or the like may ooze out from the rolling element accommodation space K1 due to a pressure difference between the rolling element accommodation space K1 and the outside of the rolling element accommodation space K1. For example, the slight gap S1 (see FIG. 1) between the first seal unit 71 and the outer ring 50, the slight gap S1 (see FIG. 1) between the first seal unit 71 and the shaft member 1, or the second seal unit 75. There is a possibility of seeping out from a slight gap S1 (see FIG. 1) between the outer ring 50 and the outer ring 50 and a slight gap S1 (see FIG. 1) between the second seal unit 75 and the inner ring 40.

Therefore, as shown in FIG. 5, in the second seal unit press-fitting step, the second seal unit 75 is press-fitted in the reduced working space 91.
The work space 91 is a space sealed with a partition wall 90. The pump 92 can discharge the air in the work space 91 and set the pressure in the work space 91 to an arbitrary pressure lower than the atmospheric pressure. It is more preferable to provide pressure display means that can detect and display the pressure in the work space 91.
For example, the second seal unit 75 is press-fitted in a state where the working space 91 is depressurized to a predetermined pressure so that the pressure in the rolling element housing space K1 after the second seal unit 75 is press-fitted is almost atmospheric pressure.
After the second seal unit 75 is press-fitted, if the wheel rolling bearing device A is taken out from the work space 91 into the atmosphere, the pressure in the rolling element accommodation space K1 is also increased around the rolling element accommodation space K1 (outside). Both the pressures are atmospheric pressures and there is almost no pressure difference.
If the second seal unit 75 is press-fitted by the manufacturing method described above, there can be almost no pressure difference between the inside of the rolling element housing space K1 and the outside. Protruding from the inside of K1 to the outside can be prevented appropriately.

The manufacturing method of the wheel rolling bearing device of the present invention is not limited to the manufacturing method described in the present embodiment, and various modifications, additions, and deletions can be made without changing the gist of the present invention.
Moreover, the manufacturing method of the rolling bearing device for wheels demonstrated in this Embodiment was demonstrated using the example of the shaft member 1 in which the large diameter shaft part 11, the small diameter shaft part 12, and 12 A of inner ring contact surfaces were formed. However, the method of manufacturing the wheel rolling bearing device described in the present embodiment is applicable even to a shaft member that does not have the large-diameter shaft portion 11, the small-diameter shaft portion 12, and the inner ring abutting surface 12A. Is possible.
In the description of the present embodiment, the example in which the first inner ring raceway surface 18 is formed on the outer peripheral surface of the shaft portion 10 has been described. However, the first inner ring raceway surface 18 is not limited to being formed on the outer peripheral surface of the shaft portion 10, and the inner ring on which the first inner ring raceway surface 18 is formed may be fitted into the shaft portion 10.
Further, in the description of the present embodiment, the example in which the inner ring member is configured by the shaft member 1 and the inner ring 40 has been described. It is possible to apply the manufacturing method of the rolling bearing device for wheels.

DESCRIPTION OF SYMBOLS 1 Shaft member 10 Shaft part 11 Large diameter shaft part 12 Small diameter shaft part 18 1st inner ring raceway surface 19 Seal surface 20 Flange part 30 Fitting shaft part 40 Inner ring 44 2nd inner ring raceway surface 50 Outer ring 51 First outer ring raceway surface 52 First 2 outer ring raceway surface 61 first rolling element unit 62 first rolling element 65 second rolling element unit 66 second rolling element 71 first seal unit 72, 76, 77 core metal 73 seal member 75 second seal unit 78 seal member 91 Work space A Rolling bearing device for wheels K1 Rolling body accommodation space S1 Clearance ZC Rotating shaft

Claims (2)

An inner ring member;
An outer ring member disposed on the outer peripheral side of the inner ring member and coaxially with the inner ring member;
A rolling bearing device for a wheel having a plurality of rolling elements housed in a space between the inner ring member and the outer ring member,
A first seal unit that seals between the inner ring member and the outer ring member is fitted into an end face on one side in the axial direction in the space, and is further depressurized in advance on an end face on the other side in the axial direction in the space. A second seal unit that seals between the inner ring member and the outer ring member is fitted in the working space.
A method of manufacturing a rolling bearing device for a wheel. It is a manufacturing method of the rolling bearing device for wheels according to claim 1,
Reducing the pressure in the work space so that the pressure in the space into which the second seal unit is fitted and compressed is approximately atmospheric pressure;
A method of manufacturing a rolling bearing device for a wheel.

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