JP2003056577A - Bearing device for axle - Google Patents

Abstract

PROBLEM TO BE SOLVED: To solve the problems, on an axle bearing device with a curved portion between an inner ring member and a hub flange, being susceptible to muddy water while a hub wheel is formed of a carbon steel with its curved face liable to corrode to possibly cause a sealing member to be lower in sealing property, even thought the sealing member has a lip portion in direct contact with the curved face. SOLUTION: The portion, susceptible to muddy water has a sealing structure 12 which consists of a rustproof metal ring 30 fitted to a plane between the outer periphery face of the hub wheel 4 and the hub flange, a core metal 13 fitted to the inner periphery face of a cylindrical outer ring member 10 and an elastic sealing body 37, having the lip portion in contact with the metal ring 30 and fixed to the core metal 13. Even if the hub wheel 4 is formed, for example, a carbon steel, the rusting of the plane between the outer periphery face of the hub wheel 4 and the hub flange is prevented and so the sealing property of the sealing structure 12 is maintained.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a bearing device for an axle,
Particularly, it relates to the sealing member.

[0002]

2. Description of the Related Art FIG. 5 shows the configuration of a conventional axle bearing device 1. This is a cylindrical outer ring member 10 which is supported non-rotatably on the vehicle body side, and a hub wheel which is rotatably supported around an axis 21 on the cylindrical outer ring member 10 via balls 8 and 9 as rolling elements. (Inner ring member) 4.

A cylindrical outer ring member 10 of the hub wheel 4
A hub flange 2 for mounting a brake disc rotor and a wheel member (not shown) is formed on the outer peripheral surface of the portion projecting from the vehicle outer side A to project radially outward.

An inner ring member 3 which is a member different from the hub wheel 4 is integrally fitted on the outer peripheral surface of the hub wheel 4 on the vehicle inner side B, and the balls 8 in the one row are the outer peripheral surface of the hub wheel 4. Is the inner raceway surface, the balls 9 of the other row are the inner raceway surface of the inner race member 3, and the inner raceway surface of the cylindrical outer race member 10 is the common outer raceway surface.

A seal member 5 for sealing the annular bearing space between the tubular outer ring member 10 and the hub wheel 4 and the inner ring member 3 on the vehicle outer side A is provided.
The seal member 5 is composed of a core metal 13 fitted to the inner peripheral surface of the cylindrical outer ring member 10 and an elastic seal body 37 fixed to the core metal 13, and the elastic seal body 37 is The inner ring member 3 and the hub flange 2 have a lip portion 17 that contacts a curved surface 16 that is continuous.

[0006]

In the above-described conventional bearing device 1 for an axle, the curved surface 16 portion where the inner ring member 3 and the hub flange 2 are continuous is a place where muddy water or the like is likely to be splashed.
Therefore, although the seal member 5 is provided so that the lip portion 17 of the seal member 5 directly contacts the curved surface 16, the hub wheel 4 is made of carbon steel and the curved surface 16 is easily corroded. The sealability of the seal member 5 is likely to deteriorate.

Therefore, an object of the present invention is to provide a bearing device for an axle that can solve the above problems.

[0008]

In order to solve the above-mentioned problems, an axle bearing device according to the present invention comprises an outer ring member mounted non-rotatably on the vehicle body side, and an axial center around the outer ring member via rolling elements. An inner ring member rotatably supported on the inner ring member, and a seal member for sealing an annular bearing space between the outer ring member and the inner ring member, the seal member being radially outward on the outer peripheral surface of the inner ring member. A core metal fitted to the inner peripheral surface of the outer ring member on the side of the bulging portion formed in a bulge, and a continuous surface portion of the outer peripheral surface of the inner ring member and the radial side surface along the radial direction of the bulging portion. And an elastic seal body having a lip portion that is attached to the core metal and is in contact with the metal ring.

As described above, the seal member has a cored bar fitted to the inner peripheral surface of the outer ring member on the side of the bulging portion formed to bulge outward in the radial direction on the outer peripheral surface of the inner ring member, and the inner ring member. A non-rusting metal ring fitted to a continuous surface portion of the outer peripheral surface and a radial side surface along the radial direction of the bulging portion; and an elastic seal body having a lip portion attached to the core metal and in contact with the metal ring. According to the configuration, even when the inner ring member is formed of a material such as carbon steel, the continuous surface portion between the outer peripheral surface of the inner ring member and the bulging portion is prevented from rusting, and therefore the seal is formed. The sealing property of the member can be maintained.

Further, the metal ring has a fitting portion which is fitted to the outer peripheral surface of the inner ring member and a radial portion which overlaps a radial side surface of the bulging portion, and the elastic seal member is a fitting portion of the gold ring and It has a lip part which contacts each radial direction part.

With the above-mentioned structure, even when the accuracy of the verticality of the radial portion along the radial surface is lower than a predetermined value, the radial portion is formed on the radial side surface of the bulging portion. A predetermined verticality is obtained by copying, and the lip portion contacts the radial portion with a required contact force.

Further, the inner ring member is composed of a hub wheel for mounting the wheel and a bowl-shaped outer ring member of a constant velocity joint rotatably and integrally connected to the hub wheel, and the bulging portion fixes the wheel. Thus, the hub flange is formed so as to project radially outward from the outer peripheral surface of the hub wheel at a position near one end of the outer ring member.

According to this structure, even if the inner ring member is made of a material such as carbon steel, it is possible to prevent the continuous surface portion between the outer peripheral surface of the inner ring member and the hub flange from rusting, and thus the seal. The sealing property of the member can be maintained.

Further, the inner ring member is composed of a hub wheel for mounting the wheel and a bowl-shaped outer ring member of a constant velocity joint rotatably and integrally connected to the hub wheel,
A bulging portion is formed on the outer peripheral surface of the bowl-shaped outer ring member at a position near the other end of the outer ring member.

According to this structure, even when the inner ring member is made of a material such as carbon steel, it is possible to prevent the continuous surface portion between the outer peripheral surface of the inner ring member and the bulging portion from rusting, and The sealability of the seal member can be maintained.

In any of the above constructions, since the metal ring is fitted to the inner ring member and the lip portion is brought into contact with this metal ring,
The continuous hardening from the inner ring raceway surface of the rolling elements and the grinding process to slide the lip smoothly, which were conventionally performed on the continuous surface part, are not required for the inner ring member, resulting in product productivity. Is improved.

[0017]

BEST MODE FOR CARRYING OUT THE INVENTION A bearing device for an axle according to an embodiment of the present invention will be described below with reference to FIGS. 1 and 2. The axle bearing device 1 according to the embodiment of the present invention has a single cylindrical outer ring member 10 that is non-rotatably attached to the vehicle body side via a knuckle, and the inner peripheral surface of the cylindrical outer ring member 10 is Through a double-row ball (a double-row angular ball bearing is used as an example of a rolling element) 8 and 9 held in the cage 20 at the circumferentially equidistant positions as outer ring raceways, a brake disc rotor (not shown) and A hub wheel (corresponding to one inner ring member) 4 for mounting a wheel member (wheel) and a bowl-shaped outer ring member 7 (another inner ring member) of a constant velocity joint 6 to be described later, which is integrally mounted to the hub wheel 4. (Corresponding to) is rotatably supported around the axis 21.

The outer peripheral surface of the hub wheel 4 is used as the inner ring raceway surface of the balls 8 in the one row, and the outer circumferential surface of the bowl-shaped outer ring member 7 is used as the inner ring raceway surface of the balls 9 in the other row. The inner peripheral surface of the member 10 is used as a common outer ring raceway surface for the balls 8 and 9 in each row. A fixing flange 22 is formed on the outer peripheral surface of the cylindrical outer ring member 10 so as to project radially outward, and the fixing flange 22 is fixed to the knuckle.

A cylindrical outer ring member 10 of the hub wheel 4.
A hub flange (an example of a bulging portion) 2 protruding outward in the radial direction is formed in the vicinity of the cylindrical outer ring member 10 on the outer peripheral surface of a portion protruding from the shaft center 21 direction (vehicle outer side A),
The brake disc rotor is overlapped and fixed to the hub flange 2, and a hub bolt 23 for fixing a wheel member is press-fitted into the hub flange 2. Further, both side surfaces of the hub flange 2 are formed as surfaces parallel to the radial direction.

The bowl-shaped outer ring member 7 has an insertion hole 24 formed in the center of the hub wheel 4 on the vehicle outer side A thereof.
A hollow shaft portion 25 for spline fitting is integrally formed with the shaft portion 25 and the end portion A of the vehicle outer side of the shaft portion 25 is caulked.
It is configured so that it can rotate around the body.

The constant velocity joint 6 uses what is called a Rzeppa type (Burfield type), and the bowl-shaped outer ring member 7 and the inner ring portion 27 in which the end of the drive shaft 26 is inserted and fixed. , A ball 28 for tilting and guiding the hub wheel 4 with respect to the drive shaft 26, and a retainer 29 thereof.

Next, the seal structures (seal members) 11 and 12 in the axle bearing device 1 will be described. First, one seal structure 12 for sealing the gap between the tubular outer ring member 10 and the hub wheel 4 on the hub flange 2 side will be described. This is a non-rusting (rustless) metal ring 30 fitted to the outer peripheral surface of the hub wheel 4 and the continuous surface of the hub flange 2, and a core metal 13 fitted to the inner peripheral surface of the tubular outer ring member 10. And an elastic seal body 37 fixed to the core metal 13.
It consists of and.

As the material of the ring 30, JIS / S
Stainless steel such as US430, 304 is used.

As shown in FIG. 2, the metal ring 30 is fitted on the outer peripheral surface of the hub wheel 4 and is fitted on the fitting portion 31 parallel to the axis 21 and on the tubular outer ring member 10 side of the hub flange 2. It is formed in a substantially L-shaped cross section from a radial portion 32 that is bent so as to rise radially outward from the fitting portion 31 so as to come into close contact with the radial side surface 2a.

The elastic seal member 37 has a bifurcated radial lip 35 which comes into radial contact with the fitting portion 31 of the metal ring 30 and an axial lip 15 which comes into axial contact with the radial portion 32 of the metal ring 30. ing.

Next, the other seal structure 11 for sealing the gap between the cylindrical outer ring member 10 and the bowl-shaped outer ring member 7 of the constant velocity joint 6 will be described. As shown in FIG. 1, this is a core metal 1 fitted on the inner peripheral surface of a cylindrical outer ring member 10.
4 and an elastic seal body 43 fixed to the core metal 14 and having lip portions 36 that come into contact with the outer peripheral curved surface of the bowl-shaped outer ring member 7 at three points, and the outer peripheral portion of the core metal 14 has an axial center. In the direction (vehicle inner side B), an extension portion 40 is formed, and the seal structure 11 is fitted to the outer peripheral surface of the bowl-shaped outer ring member 7 to surround the extension portion 40 to extend the extension portion 4
It has an annular body 41 having a U-shaped cross section that forms a labyrinth gap with zero.

In the axle bearing device 1 having the above-described structure, muddy water may be splashed while the vehicle is running, and particularly because of the structure in which the tire is mounted on the hub wheel 4, the muddy water is more easily affected than other parts. .

However, as the seal structure 12 in the place where muddy water is likely to be splashed, a non-rusting metal ring 30 fitted to a continuous surface between the outer peripheral surface of the hub wheel 4 and the radial side surface 2a of the hub flange 2, and a tubular shape A core metal 13 fitted to the inner peripheral surface of the outer ring member 10, and an elastic seal body 37 fixed to the core metal 13.
Therefore, even if the hub wheel 4 is made of, for example, carbon steel, the elastic seal member 37 is formed.
It is possible to prevent the continuous surface portion between the outer peripheral surface of the hub wheel 4 and the radial side surface 2a of the hub flange 2 that comes into contact with the rust, and thus maintain the sealing performance of the seal structure 12.

Further, a gold ring 30 is fitted on the outer peripheral surface of the hub wheel 4 and the continuous surface of the hub flange 2, and the radial lip 35 and the axial lip 15 are brought into contact with this, which has been conventionally performed on the continuous surface. The continuous quenching process from the inner ring raceway surface and the polishing process for sliding the lip portion 17 smoothly are not necessary for the hub wheel 4, and the productivity of the hub wheel 4 can be improved.

In addition, the radial portion 3 of the metal ring 30 is temporarily assumed.
2 verticality, that is, the radial side surface 2a of the hub flange 2
Even when the degree of conformity with is lower than the predetermined verticality, the radial portion 32 follows the radial side surface 2a by press-fitting the metal ring 30 into the outer peripheral surface of the hub wheel 4. As a result, the radial portion 32 can have a predetermined verticality, and the contact force of the axial lip 15 with respect to the radial portion 32 can have a predetermined value, so that the required sealing performance can be obtained.

In the above embodiment, the cylindrical outer ring member 10 is used as the other seal structure 11 for sealing the gap between the cylindrical outer ring member 10 and the bowl-shaped outer ring member 7 of the constant velocity joint 6.
An elastic seal body 43 having a lip portion 36 that comes into contact with the outer peripheral curved surface of the bowl-shaped outer ring member 7 at three points is fixed to the core metal 14 fitted to the inner peripheral surface of the core metal 14, and the extension portion 40 of the core metal 14 is surrounded. The annular body 41 is attached to the outer peripheral surface of the bowl-shaped outer ring member 7, but the present invention is not limited to this.

For example, FIGS. 3 and 4 show the other seal structure 50 in another embodiment. As shown,
The other sealing structure 50 forms a fitting plane 52 parallel to the axial center 21 on the outer peripheral portion of the bowl-shaped outer ring member 7 that radially opposes the other end of the cylindrical outer ring member 10. At the vehicle inner side A end of the wearing plane 52, a bulging portion 51 bulging outward in the radial direction from the fitting wearing plane 52 is formed, and a continuous surface of the bulging section 51 with the fitting wearing plane 52 is formed. The radial surface 53 is directed outward in the radial direction.

Then, as shown in FIG.
Is formed into a substantially L-shaped cross section by a fitting portion 54 that is fitted to the radial surface 53 and a radial portion 56 that is bent so as to rise outward from the fitting portion 54 so as to be in close contact with the radial surface 53. An antirust metal ring 55 is provided. The material of the metal ring 55 is the same as that of the above embodiment.

Further, a bifurcated radial lip 58 and a radial portion 56, which are in radial contact with the fitting portion 54, are fitted to a core metal 57 fitted to the inner peripheral surface of the other end portion of the tubular outer ring member 10.
Is provided with an elastic seal body 60 having an axial lip 59 that contacts in the axial direction.

In FIG. 3, the constant velocity joint 6 is partially omitted from the description of its structure. However, similar to the above-described embodiment shown in FIG. 1, the bowl-shaped outer ring member 7 and the inside thereof are It is provided with an inner ring portion 27 in which the end portion of the drive shaft 26 is inserted and fixed, a ball 28 for tilting and guiding the hub wheel 4 with respect to the drive shaft 26, and a retainer 29 thereof.
The other structure is similar to that of the above-mentioned embodiment, and therefore omitted.

As in the above configuration, in this embodiment,
The other sealing structure 11 that seals the annular bearing space on the other side of the tubular outer ring member 10 has the fitting flat surface 52 of the bulging portion 51.
A metal core 55 provided with a non-rusting metal ring 55 having a fitting portion 54 that fits on the inner surface of the tubular outer ring member 10 and a radial portion 56 that fits tightly on the radial surface 53. 57, an elastic seal body 60 having a bifurcated radial lip 58 that comes into radial contact with the fitting portion 54 and an axial lip 59 that comes into axial contact with the radial portion 56 is provided.

Although the hub wheel 4 is more susceptible to muddy water than the other parts due to the tire mounting structure, the hub wheel 4 has the above structure as the other sealing structure 50. Even if 4 is made of carbon steel, for example, the fitting flat surface 52 of the bowl-shaped outer ring member 7 in contact with the elastic seal body 60 and the radial surface 53 of the bulging portion 51 continuous with the flat surface 52 do not rust. Therefore, the sealing property of the seal structure 50 can be maintained for a long period of time.

In this embodiment, it is possible to improve the productivity of the bowl-shaped outer ring member 7 by eliminating the conventional quenching and polishing processes for the bowl-shaped outer ring member 7 corresponding to the seal structure 50. it can.

Even when the accuracy of the verticality of the radial direction portion 56 is lower than a predetermined value, by pressing the gold ring 55 into the fitting and mounting plane 52 of the bowl-shaped outer ring member 7, the radial direction of the metal ring 55 is increased. Since the portion 56 follows the radial surface 53 of the bulging portion 51, a predetermined verticality is obtained, and the axial lip 59 of the elastic seal body 60 contacts the radial portion 56 with a predetermined contact pressure, so that the required sealing performance is obtained. Is obtained.

In the above-described embodiment, as the axle bearing device 1 on the drive wheel side, the hub wheel 4 and the hub wheel 4 are provided inside the cylindrical outer ring member 10 via the double rows of balls 8 and 9. An example in which the seal structure 12 having the above-described structure is applied to the structure in which the bowl-shaped outer ring member 7 of the constant velocity joint 6 integrally connected to the shaft 4 is rotatable around the axis 21 is shown. However, the present invention is not limited to this.

For example, as shown in the conventional example of FIG. 5, as a bearing device 1 for a driven wheel side axle, it is supported by a cylindrical outer ring member 10 via balls 8 and 9 so as to be rotatable around an axis 21. A hub wheel 4 is provided, and an inner ring member 3 which is a member different from the hub wheel 4 is fitted to the vehicle inner side B of the hub wheel 4, and the inner ring raceway surface of the balls 8 in one row serves as the outer peripheral surface of the hub wheel 4. It is also applicable as the one side seal structure 12 in the axle bearing device 1 of the type in which the inner ring raceway surface of the ball 9 in the other row is the outer peripheral surface of the inner ring member 3. Also in this case, the same operational effects as those of the above-described embodiment can be obtained.

[0042]

As is apparent from the above description, according to the present invention, a seal member for sealing the annular bearing space between the outer ring member and the inner ring member of the axle bearing device is provided on the outer peripheral surface of the inner ring member. A cored bar fitted to the inner peripheral surface of the outer ring member on the side of the bulging portion formed to bulge outward in the direction of the outer peripheral surface of the inner ring member and a radial side surface along the radial direction of the bulging portion. The inner ring member is made of, for example, carbon steel because it is composed of an antirust gold ring fitted to the continuous surface portion and an elastic seal body having a lip portion attached to the core metal and in contact with the gold ring. Prevents rusting of the continuous surface between the outer peripheral surface of the inner ring member and the bulging portion, even when muddy water or the like is likely to occur.
Therefore, the sealing performance of the seal member can be maintained.

Further, it is not necessary to carry out the quenching process for the portion corresponding to the seal member portion of the inner ring member and the polishing process for sliding the lip portion smoothly, which has been conventionally performed, thereby improving the productivity of the product. be able to.

[Brief description of drawings]

FIG. 1 is a sectional view showing an overall configuration of an axle bearing device according to an embodiment of the present invention.

FIG. 2 is likewise an enlarged sectional view of a main part.

FIG. 3 is a sectional view showing an overall configuration of an axle bearing device according to another embodiment.

FIG. 4 is likewise an enlarged cross-sectional view of a main part.

FIG. 5 is a cross-sectional view showing the overall configuration of a conventional axle bearing device.

[Explanation of symbols]

Bearing device for 1 axle 2 hub flange 4 hub wheels 6 constant velocity joint 7 Bowl-shaped outer ring member 10 Cylindrical outer ring member 12 Seal structure 13 core 15 axial lip 21 axis 22 Fixed flange 30 gold ring 31 Fitting part 32 radial section 35 radial lip 37 Elastic seal body

Claims (4)

[Claims] 1. An outer ring member mounted non-rotatably on the vehicle body side, an inner ring member rotatably supported by the outer ring member around an axis through rolling elements, and an annular ring between the outer ring member and the inner ring member. A bearing device for an axle provided with a seal member for sealing a bearing space, wherein the seal member is an outer ring member inner circumference on a bulging portion side bulged radially outward on an outer peripheral surface of the inner ring member. A core metal fitted to a surface, an antirust metal ring fitted to a continuous surface portion of the outer peripheral surface of the inner ring member and a radial side surface along the radial direction of the bulging portion, and the core metal A bearing device for an axle, comprising: an elastic seal body having a lip portion that is attached to and is in contact with a metal ring. 2. The metal ring has a fitting portion fitted to the outer peripheral surface of the inner ring member and a radial portion overlapping the radial side surface of the bulging portion,
2. The bearing device for an axle according to claim 1, wherein the elastic seal body has lip portions that come into contact with the fitting portion and the radial direction portion of the metal ring. 3. The inner ring member is composed of a hub wheel for mounting the wheel and a bowl-shaped outer ring member of a constant velocity joint rotatably connected to the hub wheel, and the bulge portion fixes the wheel. The axle bearing device according to claim 1 or 2, wherein the hub flange is formed so as to project radially outward from the outer peripheral surface of the hub wheel at a position near one end of the outer ring member. 4. The inner ring member is composed of a hub wheel for mounting the wheel and a bowl-shaped outer ring member of a constant velocity joint rotatably and integrally connected to the hub wheel, and the bulge portion is the other of the outer ring members. The axle bearing device according to claim 1 or 2, which is formed on an outer peripheral surface of the bowl-shaped outer ring member at a position near a side end portion.