JP2003191709A - Rolling bearing - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To solve a problem that a manufacturing cost of a rolling bearing for a wheel is high since the outer peripheral face of a bowl-shaped outer wheel member is used for an inner wheel track face of a ball on one row, while the outer peripheral face of a flange shaft is used for an inner wheel track face of a ball on the other row, and a shaft part of the bowl-shaped outer wheel member is fitted to a center hole of the flange shaft, which makes the shape of the bowl-shaped outer wheel member and the flange shaft complicated. <P>SOLUTION: A stepped face 15 is formed on the bowl-shaped outer wheel member 8, the entire shaft part 13 is formed with the same diameter, and one inner wheel member 10 is pressed into the shaft part 13 to be in the pressure contact with the stepped face 15 so as to eliminate the need to form an inner wheel track face of the ball 4 of one row on the bowl-shaped outer wheel member 8, and thus, manufacture of the bowl-shaped outer wheel member 8 becomes easy, and since not a special but a conventional material is used for this one inner wheel member 10, manufacturing cost is reduced for the entire rolling bearing device 1 for a wheel. <P>COPYRIGHT: (C)2003,JPO

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a rolling bearing device used for wheel applications.

[0002]

2. Description of the Related Art FIG. 3 shows a wheel rolling bearing device 50 as an example of a conventional rolling bearing device. This wheel rolling bearing device 50 is rotatable about an axis 54 via an outer ring member 51 that is non-rotatably supported on the vehicle body side and two rows of balls 52 and 53 as rolling elements on the outer ring member 51. The inner ring member 55 is supported.

The inner ring member 55 is a bowl-shaped outer ring member 56 of a constant velocity joint (constant velocity universal joint), and a flange shaft (hub wheel) 57 having a flange 57a for mounting wheels (brake disc rotor and tire wheel). And the outer peripheral surface of the bowl-shaped outer ring member 56 is used as the inner ring raceway surface of the balls 52 in one row, and the outer circumferential surface of the flange shaft 57 is used as the inner ring raceway surface of the balls 53 in the other row. Inner surface of the two balls 5
It is used as 2,53 outer ring raceways.

Further, the bowl-shaped outer ring member 56 is spline-fitted into the center hole of the flange shaft 57, and the end portion is crimped to the end surface of the flange shaft 57, so that the bowl-shaped outer ring member 56 and the flange shaft 57 are A shaft portion 58 for integrally connecting the shafts around the shaft center 54 is integrally formed.

In such a rolling bearing device 50 for a wheel, a bowl-shaped outer ring member 56 is incorporated from one of the outer ring members 51 via balls 52 in one row, and balls 53 in the other row are inserted.
Further, the flange shaft 57 is incorporated into the outer ring member 51 so that the shaft portion is spline-fitted (press-fitted) into the center hole of the flange shaft 57, and then the end portion of the flange shaft 57 is caulked.

[0006]

In the above-described conventional rolling bearing device for wheels 50, the outer peripheral surface of the bowl-shaped outer ring member 56 is used as the inner ring raceway surface of the balls 52 in one row, and the balls 5 in the other row are used.
3 The outer peripheral surface of the flange shaft 57 is used as the inner ring raceway surface, and the shaft portion 58 of the bowl-shaped outer ring member 56 is attached to the flange shaft 5.
Since it is configured to be spline-fitted into the center hole of No. 7, the bowl-shaped outer ring member 56 and the flange shaft 57 have complicated shapes, and the length of the spline portion must be long, resulting in high manufacturing cost. There is.

When it is desired to use a brake disc rotor adapted to the vehicle type, it is necessary to use the flange shafts 57 that match the respective types, but in this case, as described above, the inner ring of the balls 53 in the other row is used. Since the outer peripheral surface of the flange shaft 57 is used for the raceway surface, the flange shaft 57 having a complicated shape corresponding to the vehicle type is used.
Was required, and the rolling bearing devices for wheels were diversified.

Therefore, an object of the present invention is to provide a rolling bearing device which can solve the above problems.

[0009]

In order to solve the above-mentioned problems, a rolling bearing device of the present invention includes an outer ring member which is supported non-rotatably on the vehicle body side, and a double row rolling element provided on the outer ring member. A cylindrical inner ring member that is rotatably supported around an axis, and a bowl-shaped outer ring member that has a shaft portion that is inserted into the inner ring member at one end side in the axial direction and that forms a part of a joint, The inner ring member is arranged adjacent to one end side in the axial direction of the first race having the first race having the races of the rolling elements of one row and the race of the rolling elements of the other row. And a second bearing ring integrally formed with a flange for mounting the wheel on the outer peripheral surface.

As described above, the outer ring member is integrally formed with the first race having the raceways of the rolling elements of one row and the flange having the raceways of the rolling elements of the other row for mounting the wheels. By having the second raceway ring, it is not necessary to form a raceway surface on the bowl-shaped outer ring member, so that the production is facilitated and the production cost is reduced.

In order to solve the above-mentioned problems, the rolling bearing device of the present invention has an outer ring member which is supported non-rotatably on the vehicle body side, and which rotates about the axis through a double row rolling element in the outer ring member. A cylindrical inner ring member that is freely supported, and a bowl-shaped outer ring member that has a shaft portion that is inserted into the inner ring member at one end side in the axial direction and that forms a part of a joint, wherein the inner ring member is one A first race having a raceway of rolling elements in a row, and a second race having a raceway of rolling elements in the other row and arranged adjacent to the one axial end of the first race. The second bearing ring is arranged adjacent to the one end side in the axial direction and has a mounting portion having a flange for mounting the wheel.

As described above, the outer ring member has the first raceway ring having the raceway surfaces of the rolling elements in one row, the second raceway wheel having the raceway surfaces of the rolling elements in the other row, and the second raceway. It is not necessary to form a raceway surface on the bowl-shaped outer ring member because it is arranged adjacent to the wheel and has a mounting portion having a flange for radially outwardly protruding to mount the wheel. Manufacture is facilitated, and versatility is significantly improved by using a bowl-shaped outer ring member or mounting portion according to the vehicle type and using common members for other components.

[0013]

BEST MODE FOR CARRYING OUT THE INVENTION A rolling bearing device according to an embodiment of the present invention will be described below with reference to the drawings, taking a rolling bearing device for wheels as an example. FIG. 1 is a sectional view showing the overall configuration of a rolling bearing device for a wheel according to a first embodiment of the present invention. In the following description, the “vehicle inner side” indicates the left side in the figure, and the “vehicle outer side” indicates the right side.

The wheel rolling bearing device 1 according to this embodiment is provided with an outer ring member (fixed ring) 2 supported non-rotatably on a vehicle body side through a knuckle (not shown), and the outer ring member 2 has a coronal cage. An inner ring member (rotating ring) 7 that is rotatably supported around an axis 6 via two rows of balls (an example of rolling elements) 4 and 5 that are held at equal circumferential positions by 3 and this inner ring. A shaft portion 13 is rotatably integrally inserted into the member 7, and a bowl-shaped outer ring member 8 of a constant velocity joint (constant velocity universal joint) connected to a power transmission shaft (not shown) is provided.

The outer ring member 2 is formed with a mounting flange 9 projecting radially outward in the middle of the outer peripheral surface thereof, and by mounting the mounting flange 9 on the knuckle, the outer ring member 2 is non-rotatably supported by the vehicle body. To be done.

The inner ring member 7 has balls 4 whose outer peripheral surface is one row.
It has one inner ring member (first bearing ring) 10 which is used as the inner ring raceway surface of the vehicle and is arranged on the vehicle inner side.

The inner ring member 7 has a part of the outer peripheral surface used as the inner ring raceway surface of the balls 5 in the other row, and the other inner ring member is disposed adjacent to the vehicle outer side of the one inner ring member 10. The other inner ring member 11 has a (second race ring) 11, and a hub flange 12 for mounting a wheel on the outer peripheral surface of the other inner ring member 11 projects outward in the radial direction and also has an outer ring member 2
Is integrally formed so as to be close to the end face of the. The inner peripheral surface of the outer ring member 2 is used as a common outer ring raceway surface for the balls 4 and 5 in both rows.

The shaft portion 13 of the bowl-shaped outer ring member 8 is press-fitted into the one inner ring member 10 and the other inner ring member 11, and the end portion of the shaft portion 13 on the vehicle outer side is radially expanded outward. It is crimped to the end of the other inner ring member 11.

Therefore, in the state before being crimped, the shaft portion 13 is formed to have a length obtained by adding the crimping length to the total length of the inner ring members 10 and 11 in the axial center 6 direction.

A spline 14 is formed on the outer peripheral surface of the shaft portion 13 of the bowl-shaped outer ring member 8 from a midway position in the direction of the axis 6 toward the vehicle outer side, and in particular, the other inner ring member 11 is formed.
Is press-fitted into the shaft portion 13 via the spline 14.

A stepped surface 15 is formed at a boundary portion between the bowl-shaped outer ring member 8 and the shaft portion 13, and the vehicle outer side end portion of the shaft portion 13 is caulked as described above, whereby the one inner ring member 10 is formed. Of the inner side of the vehicle is pressed against the stepped surface 15, and one inner ring member 10 and the other inner ring member 11
The opposing end faces of are contacted with each other, and a necessary preload is applied to the balls 4 and 5 in both rows.

It should be noted that the vehicle inner side end surface of one inner ring member 10 is curved at a corner portion of the stepped surface 15 by leaving a flat surface required for pressure contact with the stepped surface 15 between the corner portions. A slight gap 16 is provided in the.

Further, the annular bearing space 17 between the outer ring member 2 and the inner ring member 7 is sealed on both the vehicle inner side and the vehicle outer side, so that the lubricant in the annular bearing space 17 leaks to the outside. A sealing device 18 is provided for preventing the above and for preventing muddy water and the like from entering the annular bearing space 17 from the outside.

In the above structure, the rotation of the power transmission shaft causes the bowl-shaped outer ring member 8 and its shaft portion 13 to rotate about the axis 6, and the inner ring member 10 and the inner ring member 11 on the other side integrally with the shaft portion 13. It rotates around the axis 6, and the wheel (not shown) attached to the hub flange 12 rotates around the axis 6,
The vehicle runs.

In this embodiment, the bowl-shaped outer ring member 8
Since the stepped surface 15 is formed on the shaft portion and the shaft portion 13 is formed, and one inner ring member 10 is press-fitted into the shaft portion 13 so as to be pressed against the stepped surface 15, as in the conventional case, the bowl-shaped outer ring is formed. Member 8
Since it is not necessary to form the inner ring raceway surface of the balls 4 in one row, the bowl-shaped outer ring member 8 can be easily manufactured, and the one inner ring member 10 is not a special one and is conventionally used. Therefore, the manufacturing cost of the rolling bearing device for a wheel 1 as a whole can be reduced.

Since the gap 16 is provided between the end surface of the one inner ring member 10 and the stepped surface 15, the inner ring member 7 rotates about the axis 6 to form the balls 4 and 5. Even when the inner ring member 7 thermally expands due to contact (friction), the amount can be absorbed by the gap 16.

Next, a second embodiment of the present invention will be described based on the overall sectional view of FIG. The rolling bearing device for a wheel 1 according to the second embodiment has the inner ring raceway surface of the balls 5 in the other row and the other inner ring member 21 disposed adjacent to the vehicle outer side of the one inner ring member 10. , The other inner ring member 2
A mounting member 23 that is a member different from 1 and that is disposed adjacent to the vehicle outer side of the inner ring member 7 in the other row and that has a hub flange 22 for mounting the wheel so as to project radially outward. Have

In both inner ring members 10 and 21, the shaft portion 13 of the bowl-shaped outer ring member 8 is press-fitted, only the mounting portion 23 is press-fitted into the shaft portion 13 through the spline 14, and the end portion of the shaft portion 13 is inserted. The diameter is expanded outward in the radial direction and the end surface of the mounting portion 18 is caulked, whereby the end surface of one inner ring member 10 and the stepped surface 15, the end surfaces of both inner ring members 10 and 21, and the other inner ring member 21 and the mounting portion. The end faces of 23 are pressed against each other, and a necessary preload is applied to the balls 4 and 5 in both rows. Other configurations are similar to those of the first embodiment described above, and thus description thereof will be omitted.

By the way, the size of the brake disc rotor or the tire wheel may be changed depending on the vehicle type. In the rolling bearing device 1 for a wheel having the above-mentioned configuration, the outer ring member 2, the balls 4, 5 and one inner ring member are used. 10 and the other inner ring member 21 has a double row rolling bearing configuration, and the mounting portion 23 having the hub flange 12 is a separate body from the other inner ring member 21, so that the brake disc rotor and the tire wheel are provided. The versatility can be remarkably improved by using the mounting portion 23 according to the size of the above and using a common member for the other portions.

As in the first embodiment, since the bowl-shaped outer ring member 8 does not have the raceway surface of the balls 4, the bowl-shaped outer ring member 8 is easy to manufacture, and the other parts are the outer ring member 2. , Balls 4, 5, one inner ring member 10 and the other inner ring member 21
Since it is a double-row rolling bearing configured by and a mounting portion 23 having a hub flange 22, only the size of the bowl-shaped outer ring member 8 is changed according to the vehicle type, and the other portions are formed by using a common member. Of the wheel rolling bearing device 1 can be significantly improved (the diversification of the rolling bearing device for a wheel 1 can be suppressed).

Further, the hub flange 22 does not particularly require accurate coaxiality, and in this embodiment, since the mounting portion 23 is provided separately from other components, it is a hardened product. May be. The length of the spline 14 of the shaft portion 13 need only be the length of the attachment portion 23 in the direction of the axis 6 and therefore, the processing time for manufacturing the bowl-shaped outer ring member 8 is the same as in the first embodiment. The manufacturing cost of the rolling bearing device 1 for a wheel can be reduced and the productivity can be improved. Other functions and effects are the same as those in the first embodiment, and therefore their explanations are omitted.

[0032]

As is apparent from the above description, according to the present invention, it is not necessary to form a raceway surface on the bowl-shaped outer ring member, so that the manufacturing thereof becomes easy and the manufacturing cost can be reduced. .

Further, the versatility can be remarkably improved by using a bowl-shaped outer ring member or a mounting portion according to the type of vehicle and using common members for other components.

[Brief description of drawings]

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

FIG. 2 is a sectional view showing an overall configuration of a rolling bearing device according to a second embodiment of the present invention.

FIG. 3 is a cross-sectional view showing the overall configuration of a conventional rolling bearing device.

[Explanation of symbols]

1 Rolling bearing device 2 Outer ring member 7 Inner ring member 8 Bowl-shaped outer ring member 9 Mounting flange 10 One inner ring member 11, 21 The other inner ring member 12,22 Hub flange 13 Shaft 14 splines 15 stepped surface 17 Annular bearing space

Claims (2)

[Claims] 1. An outer ring member that is non-rotatably supported on the vehicle body side, a cylindrical inner ring member that is rotatably supported by the outer ring member around a shaft center through double rows of rolling elements, and an axial direction. A bowl-shaped outer ring member that has a shaft portion that is inserted into the inner ring member on one end side and that forms a part of a joint; and the inner ring member has a first raceway ring having raceway surfaces of one row of rolling elements, A second race having a raceway of the rolling elements of the other row and arranged adjacent to one end of the first race in the axial direction and integrally formed with a flange for mounting the wheel on the outer peripheral surface; A rolling bearing device comprising: 2. An outer ring member which is non-rotatably supported on the vehicle body side, a cylindrical inner ring member which is rotatably supported by the outer ring member about its axis through a double row rolling element, and an axial direction. A bowl-shaped outer ring member that has a shaft portion that is inserted into the inner ring member on one end side and that forms a part of a joint; and the inner ring member has a first raceway ring having raceway surfaces of one row of rolling elements, A second race ring having the raceway surface of the rolling element in the other row and arranged adjacent to the one axial end side of the first race, and adjacent to the one axial end side of the second race. And a mounting portion having a flange for mounting a wheel.