JP2006226441A - Vehicular roller bearing device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a vehicular roller bearing device capable of preventing an attachment mistake from occurring, and of effectively suppressing generation of fretting friction as well. <P>SOLUTION: This vehicular roller bearing device 1 is provided with a hub shaft 3 and a roller bearing (double row angular ball bearing) 4. The curved surface shape of an inside edge part R2 on the other side in the axial direction (inboard side) of the inner ring 41 of the roller bearing 4 is set smaller than that of an inside edge part R1 on one side in the axial direction (outer-board side) of the inner ring 41. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a rolling bearing device for a vehicle used in, for example, an ABS (anti-lock brake system).

  In recent years, with the activation of ABS sensors, rolling bearing devices for vehicles in which an annular magnetized body (magnetized pulsar ring) is disposed on the rotating wheel side of the rolling bearing are used. Such a rolling bearing device for a vehicle generally detects a rotation of a magnetized pulsar ring rotating together with a rotating wheel by a magnetic sensor (for example, a magnetic sensor having a magnetoresistive element) as a magnetic change, thereby detecting the number of rotations of the rotating wheel. It is configured to be able to.

FIG. 4 shows an example of such a rolling bearing device for a vehicle. The rolling bearing device 9 for a vehicle is used by being mounted on a drive shaft (rotating shaft) 2 having a small-diameter shaft portion 21 formed on the outer board side (right side in FIG. 4) and a large-diameter shaft portion 22 connected thereto. The small-diameter sleeve portion 31 is formed with a spline 31s that meshes with the spline 21s of the small-diameter shaft portion 21 of the drive shaft 2 and that has a stepped portion 31a for positioning on one axial side (outer board side). And a double-row angular contact ball bearing 4 as a rolling bearing.
A flange portion 32 for connecting to the hub shaft 3 to a wheel (not shown) is integrally projected on the outer peripheral surface of the hub shaft 3 in the radially outward direction.

  The rotational force of the drive shaft 2 can be transmitted to the wheels via the hub shaft 3 by the engagement of the splines 21s of the drive shaft 2 and the splines 31s of the hub shaft 3. Further, a magnetized pulsar ring 6 is disposed on the seal member 48 on one side (left side in FIG. 4) of the double row angular ball bearing 4, and the magnetic sensor 5 is disposed so as to face the magnetized pulsar ring 6. ing. Note that the magnetizing pulsar ring 6 is not provided on the seal member 47 on the other side (right side in FIG. 4) of the ball bearing 4.

  In the rolling bearing device 9 for a vehicle having the above configuration, in consideration of manufacturing efficiency and the like, both axial sides (outer board side and inboard side) of the inner ring 41 (including the first inner ring member 49 and the second inner ring member 50). ) Are both chamfered to the same curved surface (see, for example, Patent Document 1). Such a rolling bearing device 9 for a vehicle is assembled by mounting the hub shaft 3 and the double-row angular ball bearing 4 on the drive shaft 2 and then screwing them together with the nut member 7. Such assembling is generally automated to improve assembling efficiency.

Japanese Patent Laid-Open No. 2003-130060 (FIG. 1)

  The rolling bearing device 9 for a vehicle has a configuration in which the magnetized body 6 is attached only to the seal member 48 on the inboard side, and the magnetized body 6 is not provided on the seal member 47 on the outer board side. It itself has directionality in the axial direction. For this reason, if the rolling bearing 4 is externally fitted to the sleeve 31 in the opposite axial direction, the magnetized body 6 and the magnetic sensor 5 do not face each other, and the rotational speed cannot be detected. End up. In particular, when assembly is automated, assembly mistakes are likely to occur, so there is a strong demand for the development of effective technical means that can easily prevent assembly mistakes.

In the rolling bearing device 9 for a vehicle, since the end surface of the inner ring 41 (second inner ring member 50) is in contact with the large-diameter shaft portion 22 of the drive shaft (rotating shaft) 2, fretting wear is prevented. There is also a unique problem that it is likely to occur, and it is important to effectively suppress the occurrence of such fretting wear.
The present invention has been made in view of such circumstances, and an object of the present invention is to provide a rolling bearing device for a vehicle that can prevent erroneous assembly and that effectively suppresses occurrence of fretting wear. And

The rolling bearing device for a vehicle of the present invention is
A rotating shaft having a small diameter shaft portion formed on one side in the axial direction and a large diameter shaft portion connected thereto;
A hub shaft having a sleeve portion coaxially fitted to the outer periphery of the small-diameter shaft portion and having a stepped portion for positioning on one side in the axial direction;
Inner and outer rings, rolling elements arranged in a double row between the inner and outer rings, a pair of seal members arranged on both sides in the axial direction to seal the annular space formed by the inner and outer rings, and each of the seal members A rolling bearing having a magnetized body provided on the seal member on the other side in the axial direction,
The rolling bearing is connected to the hub in a state where one axial side of the inner ring is brought into contact with a stepped portion of the hub shaft and the other axial side of the inner ring is brought into contact with a large-diameter shaft portion of the rotating shaft. In the rolling bearing device for a vehicle attached to the sleeve portion of the shaft in an outer fitting shape,
The inner ring is chamfered with different radii of curvature at the inner peripheral edge portions on one axial side and the other axial side of the inner ring.

  According to the above configuration, the chamfering process having different shapes is applied to the inner peripheral edge of the inner ring on one side and the other side in the axial direction of the inner ring of the rolling bearing that has directionality in the axial direction depending on the presence or absence of the magnetized body. Therefore, when the axial direction of the rolling bearing is opposite, the bearing cannot be properly fitted onto the sleeve, and this effectively suppresses the occurrence of assembly errors.

  In the present invention, it is preferable that a cross-sectional shape of the chamfering process performed on the other axial side of the inner ring is smaller than a cross-sectional shape of the chamfering process performed on the one axial side of the inner ring. In this case, since the cross-sectional shape of the chamfering process located on the other side in the axial direction contacting the rotating shaft is smaller than usual, the contact area with the rotating shaft becomes larger, and as a result, the contact surface pressure with respect to the rotating shaft becomes smaller. Become. Therefore, occurrence of fretting wear can also be suppressed.

According to the present invention, in the state where the axial direction of the rolling bearing is opposite, the bearing cannot be properly fitted onto the sleeve, so that it is possible to effectively prevent an assembly error from occurring.
In addition, according to the present invention, the contact surface pressure with respect to the rotating shaft can be further reduced, so that the occurrence of fretting wear can be suppressed.

Hereinafter, preferred embodiments of the present invention will be described with reference to the drawings.
FIG. 1 is a sectional view showing a rolling bearing device for a vehicle according to an embodiment of the present invention. The rolling bearing device 1 for a vehicle according to the present embodiment includes, for example, a small diameter shaft portion 21 formed on one side in the axial direction (outer board side, right side in FIG. 1) and the small diameter shaft portion 21. A drive shaft (rotary shaft) 2 having a large-diameter shaft portion 22 having a diameter larger than 21, a hub shaft 3 coaxially mounted on the small-diameter shaft portion 21 of the shaft 2, and the hub shaft 3 And a double-row angular contact ball bearing 4 as a rolling bearing fitted on the other side in the axial direction (inboard side, left side in FIG. 1).

The hub shaft 3 is formed coaxially with the drive shaft 2 and is provided with a small-diameter sleeve portion 31 externally mounted on the small-diameter shaft portion 21 of the drive shaft 2, and on one axial side (outer board side) of the small-diameter sleeve portion 31. The formed step portion 32 having a diameter larger than that of the sleeve portion 31, the flange portion 32a integrally extending from the outer peripheral surface of the step portion 32 toward the radially outer side, and the shaft portion than the flange portion 32a. A large-diameter sleeve portion 33 is formed on one side in the direction (outer board side) and has a larger diameter than the small-diameter sleeve portion 31.
Further, a spline portion 31 s that meshes with a spline portion 21 s formed on the outer peripheral surface of the drive shaft 2 is formed on the inner peripheral surface of the small diameter sleeve portion 31 of the hub shaft 3, and the wheel is connected via the flange portion 32. It is comprised so that the rotational force of the drive shaft 2 can be transmitted to (not shown).

  The double-row angular ball bearing 4 externally fitted to the hub shaft 3 is interposed between an inner ring (rotating ring) 41, an outer ring (fixed ring) 42, and inner and outer rings 41, 42 in a double row in the axial direction. Balls 43 and 44 as rolling elements arranged side by side, retainers 45 and 46 for holding the respective balls 43 and 44, and seal members 47 and 48 for sealing an annular space formed between the inner and outer rings 41 and 42. And. An annular magnetized body (magnetized pulser ring) 6 facing the magnetic sensor 5 is disposed on the seal member 48 disposed on the other axial side (inboard side).

  The inner ring 41 is divided into a first inner ring member 49 having a first track part 49a and a second inner ring member 50 having a second track part 50a. The first inner ring member 49 and the second inner ring member 50 are in contact with each other, and the side surface of the inner ring 41 on the first inner ring member 49 side is in contact with the root portion of the flange portion 32 of the hub shaft 3. The side surface of the inner ring 41 on the side of the inner ring member 50 is in contact with the large-diameter shaft portion 22 of the drive shaft 2.

  Referring also to FIG. 2, the inner peripheral edge R1 on the first inner ring member 49 side is chamfered into a curved surface. The curved surface shape of the inner peripheral edge portion R1 is formed so as to fit the corner portion of the step portion 32 of the hub shaft 3, and an appropriate preload is applied to the double row angular ball bearing 4 by screwing of the nut member 7. It is comprised so that. In addition, a seal member 47 on one axial side (outer board side) is disposed between the first inner ring member 49 and the outer ring 42, and a shaft is formed in an annular space formed between the inner and outer rings 41, 42. It is sealed so that foreign matter does not enter from one side of the direction (outer board side). The seal member 47 includes, for example, a cross-sectional L-shaped member 71 disposed on the inner ring 41 side, a cross-sectional L-shaped member 73 disposed on the outer ring 42 side, and an elastic seal member 72 disposed therebetween. ing. As a matter of course, an appropriate shape can be adopted as the sealing member 47 as in the prior art.

  Also referring to FIG. 3, the inner peripheral edge R2 on the second inner ring member 50 side is also chamfered into a curved surface. The curved surface shape is formed to be smaller than the curved surface shape of the inner peripheral edge R1 (see FIGS. 1 and 2). Further, a seal member 48 on the other side in the axial direction (inboard side) is also disposed between the second inner ring member 50 and the outer ring 42, and a shaft is formed in an annular space formed between the inner and outer rings 41, 42. It is sealed so that foreign matter does not enter from the other side (inboard side) of the direction. The seal member 48 includes, for example, a cross-sectional L-shaped member 74 disposed on the inner ring 41 side, a cross-sectional L-shaped member 76 disposed on the outer ring 42 side, and an elastic seal member 75 disposed therebetween. ing. As a matter of course, an appropriate shape can be adopted as the sealing member 48 as in the prior art.

An annular magnetized body (magnetized pulsar ring) 6 for detecting the number of rotations of the inner ring 41 that is a rotating wheel is disposed on the seal member 48 on the other axial side (inboard side). More specifically, an annular magnetized body (magnetized pulsar ring) 6 is disposed on the side surface of the L-shaped member 74 constituting the seal member 48.
The magnetized pulsar ring 6 uses a magnet, a rubber magnet in which elastomer is mixed with magnetic powder, a plastic magnet in which resin is mixed with magnetic powder, and the like so that different poles (N pole and S pole) are alternately worn in the circumferential direction. It has a magnetic configuration. With such a configuration, a magnetic change (for example, a magnetic sensor having a magnetoresistive element) 5 facing the magnetized pulsar ring 6 can be detected, and the number of rotations of the inner ring 41 is detected based on the detection result. Can do.

As shown in FIG. 1, the outer ring 42 has a first track portion 42a and a second track portion 42b, and is attached and fixed to a steering knuckle (suspension device) of a vehicle (not shown). The drive shaft 2 has a nut member 7 screwed to an end portion on one axial side (outer board side) of the drive shaft 2, and the hub shaft is directed toward the other axial side (inboard side). By tightening the three small diameter sleeve portions 31, it is possible to apply an appropriate preload to the double row angular ball bearing 4.
In the present embodiment, the double-row angular ball bearing 4 is used as the rolling bearing, but other ball bearings or roller bearings may be used.

  In the rolling bearing device 1 for a vehicle according to the present embodiment configured as described above, the curved shape of the inner peripheral edge portion R2 of the second inner ring member 50 that contacts the large-diameter shaft portion 22 of the drive shaft 2 is the hub. Since it is made asymmetric by setting it smaller than the curved shape of the inner peripheral edge R1 of the first inner ring member 49 that contacts the flange portion 32 of the shaft 3, for example, the double row angular contact ball bearing 4 is attached to the hub shaft 3 by automatic assembly. If you make an assembly mistake when you put it on the exterior, you can immediately identify the mistake.

Further, since the curved shape of the inner peripheral edge portion R2 of the second inner ring member 50 that contacts the large diameter shaft portion 22 of the drive shaft 2 is reduced, the side surface of the second inner ring member 50 and the large diameter of the drive shaft 2 are reduced. The contact area with the shaft portion 22 can be increased, and as a result, the occurrence of fretting wear can be effectively suppressed. On the other hand, the curved surface shape of the inner peripheral edge portion R1 is a large curved surface shape, which is advantageous in terms of securing the strength.
Of course, the present invention is not limited to the above-described embodiment, and appropriate design changes are possible.

It is sectional drawing which shows the rolling bearing device for vehicles which concerns on the 1st Embodiment of this invention. It is an expanded sectional view for demonstrating the inner periphery part vicinity of the 1st inner ring member of the rolling bearing device for vehicles shown in FIG. It is an expanded sectional view for demonstrating the inner peripheral part vicinity of the 2nd inner ring member of the rolling bearing device for vehicles shown in FIG. It is sectional drawing which shows the conventional rolling bearing device for vehicles.

Explanation of symbols

1 Rolling bearing device for vehicle 2 Drive shaft (rotating shaft)
3 Hub shaft 4 Double row angular contact ball bearing (rolling bearing)
5 Magnetic sensor 6 Magnetized pulser ring (Magnetic body)
21 Small-diameter shaft portion 22 Large-diameter shaft portion 31 Sleeve portion 32 Stepped portion 41 Inner ring 42 Outer ring 47 Seal member 48 Seal member R1 Inner peripheral edge portion on the one axial side of the inner ring R2 Inner peripheral edge portion on the other axial side of the inner ring

Claims (2)

A rotating shaft having a small diameter shaft portion formed on one side in the axial direction and a large diameter shaft portion connected thereto;
A hub shaft having a sleeve portion coaxially fitted to the outer periphery of the small-diameter shaft portion and having a stepped portion for positioning on one side in the axial direction;
Inner and outer rings, rolling elements arranged in a double row between the inner and outer rings, a pair of seal members arranged on both sides in the axial direction to seal the annular space formed by the inner and outer rings, and each of the seal members A rolling bearing having a magnetized body provided on the seal member on the other side in the axial direction,
The rolling bearing is connected to the hub in a state where one axial side of the inner ring is brought into contact with a stepped portion of the hub shaft and the other axial side of the inner ring is brought into contact with a large-diameter shaft portion of the rotating shaft. In the rolling bearing device for a vehicle attached to the sleeve portion of the shaft in an outer fitting shape,
A rolling bearing device for a vehicle, wherein chamfering processes having different shapes are applied to inner peripheral edge portions on one axial side and the other axial side of the inner ring.   A rolling bearing device for a vehicle, wherein a cross-sectional shape of chamfering applied to the other axial side of the inner ring is smaller than a cross-sectional shape of chamfering applied to one axial side of the inner ring. .

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