JP2008064130A - Rolling bearing device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a rolling bearing device which is lightweight while ensuring the rigidity. <P>SOLUTION: The rolling bearing device comprises: a rotating bearing ring 4 composed of an inner shaft 2 and an inner ring 3; a fixed bearing ring 5 which is arranged to cover the outer circumferential side of the rotating bearing ring 4 and has a flange part 5d on its outer circumferential surface 5c; and two rows of rolling elements 6, 7 interposed between the bearing rings 4, 5. At least a part of a base end of the flange part 5d is provided in the direction for receiving respective loads from the two rows of rolling elements 6, 7 so as to enhance the rigidity of the fixed bearing ring 5. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a rolling bearing device.

  Conventionally, in rolling bearing devices, efforts have been actively made to reduce the weight. In particular, a rolling bearing device having a flange portion for fixing to a part of the suspension device on the race ring member is required to be further reduced in weight because the weight increases due to the flange portion. Further, for example, a vehicle hub unit as a rolling bearing device as described above is required to be further reduced in weight as the weight reduction of automobile parts is strongly promoted for the purpose of improving vehicle fuel efficiency. However, since the rigidity is generally lowered when the weight is reduced and the thickness is reduced, how to ensure the rigidity is a problem.

In order to achieve weight reduction, a wheel bearing rolling bearing device as shown in FIG. 7 has been proposed (see Patent Document 1). The wheel supporting rolling bearing device 101 includes a rotating race ring 104 including a hub ring (inner shaft) 102 having a mounting flange portion 102 a for mounting a wheel, and an inner ring 103 fixed integrally to the hub ring 102. And an outer ring (fixed raceway ring) 105 having a fixing flange portion 105a for fixing to a knuckle included in a suspension device that is a member on the vehicle body side, and a rolling element 106 provided so as to be able to roll between them. ing. The hub wheel 102 is made of steel having a carbon content of 0.45 mass% or more and 0.60 mass% or less, and at least a portion of the outer peripheral surface other than the raceway surface is hardened, By setting the residual compressive stress to 500 MPa or more and the retained austenite amount on the raceway surface to 3% by volume or more, the strength of the hub wheel 102 is improved and the weight can be reduced.
JP-A-2005-240879

However, in the rolling bearing device 101 described in Patent Document 1, the strength of the hub wheel 102 is improved, but the strength of the outer ring 105 is not improved, so that the rigidity may not be sufficient when the weight is reduced. There is.
This invention is made | formed in view of such a situation, and it aims at providing the rolling bearing apparatus which can be reduced in weight, ensuring rigidity.

A rolling bearing device according to the present invention includes a rotating raceway composed of an inner shaft and an inner ring, a fixed raceway that is disposed so as to cover the outer peripheral side of the rotary raceway, and has a flange portion on the outer peripheral surface thereof, and both raceways. A rolling bearing device comprising two rows of rolling elements interposed therebetween,
In order to increase the rigidity of the fixed raceway, at least a part of the base end portion of the flange portion is provided in a direction to receive each load from the two rows of rolling elements.
In the rolling bearing device configured as described above, at least a part of the base end portion of the flange portion of the fixed race is provided in the direction in which each load from the two rows of rolling elements is received. Since a part of the load applied to the fixed race ring from each of the rolling elements in the row can be received by the thick flange portion, the fixed race ring is hardly deformed and the rigidity is improved. Thereby, the fall of the rigidity by weight reduction can be suppressed.

In the rolling bearing device, the distance between the centers of the two rows of rolling elements is 2A, the distance between the bearing center and the surface on the vehicle inner side of the flange portion is B, and the center of the vehicle outer side rolling element is When the distance between the flange portion and the surface on the vehicle outer side is C, the flange portion is preferably provided at a position satisfying 0 <B <A and C <A.
In this case as well, a part of the load applied to the fixed race from each of the two rows of rolling elements can be received by the thick flange portion, thereby suppressing the deformation of the fixed race.

  According to the rolling bearing device of the present invention, the rigidity of the fixed bearing ring can be improved, and thus the weight can be reduced while ensuring the rigidity of the rolling bearing device.

Hereinafter, a preferred embodiment of a rolling bearing device of the present invention will be described with reference to the accompanying drawings. In the following description, the case where the present invention is applied to a wheel hub unit of a vehicle such as an automobile will be described as an example.
FIG. 1 is a sectional view showing a bearing device according to an embodiment of the present invention. In FIG. 1, the left side is the vehicle outer side (wheel side), the right side is the vehicle inner side, the upper side is the vehicle upper side, and the lower side is the vehicle lower side. A rolling bearing device 1 according to the present embodiment is of a double-row angular ball bearing type, and includes a rotating raceway ring 4 including an inner shaft (hub) 2 and an inner ring 3, a fixed raceway ring 5, and a plurality of balls. Two rows of rolling elements 6 and 7 are provided. Further, the rolling bearing device 1 includes cages 8 and 9 that hold the rolling elements 6 and 7 at predetermined intervals along the circumferential direction, and a seal 10 that is disposed in a gap between the fixed race 5 and the inner shaft 2. Is provided.

  A track 2 a is formed on the outer peripheral side of the inner shaft 2 of the rotating raceway ring 4, and a track 3 a is formed on the outer peripheral side of the inner ring 3. On the other hand, the fixed track ring 5 is fixed to the vehicle body side, and on the inner peripheral side thereof, a track 5a is formed at a location facing the track 2a, and the rolling element 6 is between the track 2a. It comes to roll. Further, a track 5b is formed at a position of the fixed race 5 facing the track 3a, and the rolling element 7 rolls between 3a.

The inner shaft 2 has a flange portion 2b formed radially outward at a vehicle outer side end portion, and a wheel 11 and a brake for a disc brake by a bolt 11 press-fitted and fixed to the flange portion 2b. A wheel side member (not shown) such as a rotor is fixed to the flange portion 2b. Further, a small-diameter portion 2c for externally fitting the inner ring 3 is formed on the vehicle inner side of the inner shaft 2. An annular stepped surface (butting surface) 2d is formed on the vehicle outer side of the small diameter portion 2c, and an intermediate diameter portion 2e is formed from the outer peripheral edge of the stepped surface 2d toward the vehicle outer side. Yes. A large-diameter portion 2f is formed further on the vehicle outer side of the medium-diameter portion 2e, and the outer peripheral surface of the large-diameter portion 2f is a seal surface of the seal 10.
The inner ring 3 is fitted on the small-diameter portion 2c of the inner shaft 2 and is abutted against the stepped surface 2d. The inner ring 3 is fixed to the inner shaft 2 by a caulking portion 2g provided on the vehicle inner side of the small diameter portion 2c.

  The fixed bearing ring 5 has a flange portion 5d formed on the outer peripheral surface 5c of the outer peripheral surface 5c radially outward, and a cylindrical portion 5e extending in the axial direction toward the vehicle inner side. The vehicle suspension device (not shown) is fixed to 5d by bolts (not shown). A cover 12 is press-fitted into the inner peripheral surface of the cylindrical portion 5e, and the annular opening between the inner and outer rings of the rolling bearing device 1 is sealed from the vehicle inner side, and the annular opening is connected to the vehicle outer side. Together with the seal 10 which seals from the inside, it prevents rainwater and foreign matter from entering the bearing.

  Here, in order to increase the rigidity of the fixed raceway ring 5, at least a part of the base end portion of the flange portion 5d is provided in a direction in which each load from the two rows of rolling elements 6 and 7 is received. Specifically, as shown in FIG. 2, when the distance between the centers (hereinafter also referred to as spherical centers) 6a and 7a of the two rows of rolling elements 6 and 7 is 2A, it is the center position of both the tracks 5a and 5b. The distance between the bearing center L and the ball center 6a or 7a is A, the distance between the bearing center L and the surface of the flange portion 5d on the vehicle inner side is B, and the vehicle outer side ball center 6a and the flange portion 5d. The flange 5d is provided at a position satisfying 0 <B <A and C <A, where C is the distance from the vehicle outer side surface. In the rolling bearing device 1, since a load is applied to the fixed race 5 from the two rows of rolling elements 6 and 7 in the direction of the arrow in FIG. 2, the flange portion 5d is provided at a position where the bidirectional load can be received. Thus, part of the bidirectional load applied to the fixed race 5 can be received by the thick flange portion 5d. For this reason, it becomes difficult for the fixed race 5 to be deformed, and the rigidity is improved. Thereby, the fall of the rigidity by weight reduction can be suppressed. Further, since the rigidity of the fixed bearing ring 5 is improved, the rigidity can be ensured even when the outer diameter of the fixed bearing ring 5 is set to 70 mm or less, so that the rolling bearing device 1 can be reduced in weight by being made compact. Can do.

The present invention is not limited to the above-described embodiment, and can be appropriately changed within the scope of the present invention.
The rolling bearing device 1 of the present invention is not limited to that used as a wheel hub unit of an automobile, as long as the fixed bearing ring 5 has a flange portion 5d.

  In order to clarify the relationship between the position of the flange portion of the fixed race and the rigidity, as an example, the definition of 0 <B <A and C <A (A, B, and C shown in FIG. 3) As a comparative example, A <B and A <C (A, B, and C are defined as above). The same is used except that the flange portion is formed at a position that satisfies the same condition), and a 1.2 G force is applied to the fixed race as a load applied to the fixed race during turning of the tire. The amount of displacement and the tilt angle when added were analyzed by FEM. FIG. 4 shows the FEM analysis result of the displacement amount of the fixed raceway of the embodiment, and FIG. 5 shows the FEM analysis result of the displacement amount of the fixed raceway of the comparative example. Moreover, the result of the inclination angle is shown in FIG.

  4 and 5, it was found that the fixed track ring of the example had a smaller displacement and higher rigidity than the fixed track ring of the comparative example. Further, from FIG. 6, since the inclination of the fixed raceway of the comparative example is 2.29 minutes and the inclination of the fixed raceway of the example is 1.66 minutes, the fixed raceway of the example is the fixed raceway of the comparative example. It was found that the rigidity was about 40% higher than that of the wheel. By using the fixed raceway of this embodiment, it is possible to improve the ASSY rigidity by about 10%.

It is sectional drawing which shows the rolling bearing apparatus which concerns on embodiment of this invention. It is sectional drawing explaining the fixed track ring of FIG. It is sectional drawing explaining the fixed track ring of a comparative example. It is a figure which shows the result of having analyzed the displacement amount of the fixed track ring of an Example by FEM. It is a figure which shows the result of having analyzed the displacement amount of the fixed track ring of a comparative example by FEM. It is the figure which compared the inclination angle of the fixed track ring of an Example and a comparative example. It is sectional drawing which shows the conventional rolling bearing apparatus.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Rolling bearing apparatus 2 Inner shaft 3 Inner ring 4 Rotating bearing ring 5 Fixed bearing ring 5d Flange part 6,7 Rolling body L Bearing center A Distance between bearing center and ball center B Bearing center and flange part of vehicle inner side Distance between the surface C Distance between the vehicle outer side ball center and the vehicle outer side surface of the flange portion

Claims (2)

A rotating raceway composed of an inner shaft and an inner ring, a fixed raceway that is disposed so as to cover the outer peripheral side of the rotary raceway ring, and has a flange portion on the outer peripheral surface thereof, and two rows interposed between the two raceways. A rolling bearing device comprising rolling elements,
In order to increase the rigidity of the fixed race, at least a part of the base end portion of the flange portion is provided in a direction in which each load from the two rows of rolling elements is received.   The distance between the centers of the two rows of rolling elements is 2A, the distance between the bearing center and the surface on the vehicle inner side of the flange portion is B, and the center of the vehicle outer side rolling element and the vehicle outer side of the flange portion 2. The rolling bearing device according to claim 1, wherein the flange portion is provided at a position satisfying 0 <B <A and C <A, where C is a distance from the surface.

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