JP2001080307A - Wheel bearing device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To enable the installation of an ABS sensor even if a flange portion of an outer ring is biased to an outboard side. SOLUTION: This wheel bearing device comprises: a rotor 10 for fixing a wheel and having plural rows of raceway surfaces 14, 17; an outer ring 20 having plural rows of raceway surfaces 21 and a flange portion 22 fixed to a knuckle 23 on a vehicle body side; and plural rows of rolling bodies 30 respectively interposed between the raceway surfaces 14, 17 of the rotor 10 and the raceway surfaces 21 of the outer ring 20. A pulsar ring 51 is disposed between the plural rows of raceway surfaces 14, 17 of the rotor 10, and a sensor 52 opposite to the pulsar ring 51 is held by a holding member 24 sandwiched between the flange portion 22 of the outer ring 20 and the knuckle 23, thereby arranges the sensor 52 in an internal space of a bearing.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a wheel bearing device (hub bearing) used for an automobile or the like.
In particular, the present invention relates to a wheel bearing device which incorporates a unit for detecting the number of rotations of a wheel for an ABS device.

[0002]

2. Description of the Related Art As shown in FIG. 6, a wheel bearing device includes a hub wheel 1, an inner ring 2, double rows of rolling elements 3, and an outer ring 4. On the outer peripheral surface of the hub wheel 1, a wheel mounting flange 1a for fixing a wheel is formed at an end portion on the outboard side, and a first raceway surface 5a is formed at an intermediate portion. A small-diameter step portion 1b having a reduced outer diameter is formed at the inboard end of the hub wheel 1, and the second raceway surface 5b is formed on the outer peripheral surface of the small-diameter step portion 1b.
The inner ring 2 formed is fitted. On the inner peripheral surface of the outer race 4, a double row of raceways 6 facing the first and second raceways 5a, 5b is formed, and a double row of raceways 6 with the first and second raceways 5a, 5b. And the rolling elements 3 in a double row are incorporated between them. The outer ring 4 is fixed to a suspension device (not shown) via a flange portion 4a provided on the outer peripheral surface.

As shown in FIG. 1, a pulsar ring 7 serving as a pulse generator includes an outer peripheral surface of a hub wheel 1 in which a wheel rotational speed detecting means of an ABS (anti-lock brake system) is incorporated in the wheel bearing device. And a sensor 8 serving as a pulse detector penetrating the outer ring 4 and facing the pulsar ring 7 is known.

[0004]

When the assembly of the wheel bearing device is mounted on a vehicle body, a mounting member (knuckle) extending from the suspension device on the inboard side of the flange portion 4a in the outer peripheral surface of the outer ring 4 is usually used. Inserted into the inner peripheral surface. However, when the flange portion 4a is provided on the outboard side of the outer race 4 as shown in the figure, the outer peripheral surface of the outer race is covered with a knuckle in many areas in the axial direction. The sensor 8 interferes with the knuckle, making insertion impossible. Therefore, it is necessary to reconsider the mounting position of the ABS sensor 8, but it is not easy to secure the mounting space. difficult.

Accordingly, an object of the present invention is to provide a wheel bearing device capable of mounting an ABS sensor even when a flange portion of an outer ring is at a position deviated toward an outboard side.

[0006]

According to the present invention, there is provided a rotating body having a plurality of rows of track surfaces to which wheels are fixed, a plurality of rows of track surfaces, and a mounting member on a vehicle body side. And a double row rolling element interposed between the respective raceway surfaces of the rotating body and the fixed body, and supports the wheels rotatably with respect to the vehicle body. Wherein a sensing portion is provided between multiple rows of raceways of the rotating body, and a sensor facing the sensing portion is held by a holding member sandwiched between the flange portion of the fixed body and the mounting member. It is what was held in.

As described above, if the holding member is interposed between the flange portion of the fixed body and the mounting member such as a knuckle and the sensor is held by the holding member, the flange portion of the fixed body is shifted to the outboard side. In this case, the sensor can be easily arranged in the internal space of the bearing. Since the bearing internal space is a sealed space in which both ends are sealed with seals,
The part to be sensed and the sensor can be protected from dust, salt water, stones, and the like, and stable speed detection can be performed. Further, the wheel bearing device can be made into a unit including the mounting member, and the workability of assembling the vehicle body is improved.

The rotating body has, for example, a hub wheel and an inner ring fitted to the hub wheel. In this case, of the multiple rows of raceways of the rotating body, one raceway can be provided on the hub wheel and the other raceway can be provided on the inner race.

The rotating body has a hub wheel and an outer joint member of a constant velocity universal joint connected to the hub wheel. This is suitable as a wheel bearing device for driving wheels. in this case,
Of the multiple rows of raceways of the rotating body, one raceway can be provided on the hub wheel and the other raceway can be provided on the outer joint member of the constant velocity universal joint.

The hub wheel and the outer joint member are fitted together, and the fitting portion is at least partially expanded or reduced in diameter and swaged to prevent loosening of the two and securely connect. be able to.

The flange of the fixed body, the holding member, and the mounting member on the vehicle body side are connected by, for example, bolts. In this case, if the holding member is made of resin and the periphery of the bolt hole is made of metal, the weight can be reduced, and even when the knuckle is made of an aluminum alloy, the resin material is interposed at the boundary between steel and aluminum. Therefore, rusting of a steel member (fixed body or the like) based on a difference in ionization tendency can be prevented.

[0012]

DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to FIGS. In the following description, the side that is closer to the outside of the vehicle when assembled to the vehicle is referred to as the outboard side, and the left side is the outboard side in FIGS. On the other hand, the side closer to the center of the vehicle is called the inboard side, and the right side is the inboard side in FIG.

FIG. 1 shows an embodiment of a wheel bearing device, particularly for a drive wheel. This bearing device includes a rotating body 10, a fixed body 20 disposed on the outer peripheral side of the rotating body 10, a double row rolling element 30 interposed between the rotating body 10 and the fixed body 20, and both ends of the bearing. The main components are a pair of seals 40 for sealing the opening and the wheel rotation speed detecting means 50 for ABS.

The rotating body 10 includes a hub wheel 11, an inner ring 12 fixed to an outer peripheral portion of the hub wheel 11, and an outer joint member 13 of a constant velocity universal joint J connected to the hub wheel 11. The hub wheel 11 forms a first raceway surface 14 substantially in the middle of the outer peripheral surface,
A wheel mounting flange 11a for mounting a wheel is provided at an end on the outboard side. Further, the hub wheel 11 has an axial through hole 11b at the axial center. Hub bolts 15 are implanted at equal circumferential positions of the wheel mounting flange 11a, and the hub wheel 11 is fixed to the wheel disc (not shown) together with the brake rotor 16 by the hub bolts 15.

The constant velocity universal joint J includes an inner joint member having a track groove on an outer peripheral portion, and an outer joint member 13 containing the inner joint member therein and having a track groove 13a on an inner peripheral portion.
, A ball interposed between the track groove of the inner joint member and the track groove 13a of the outer joint member, and a cage for holding all the balls in the same plane (in the drawing, the outer joint member 13 only). The inner joint member is adapted to be connected by serration or the like to a drive shaft connected to a constant velocity universal joint arranged on the engine side. The outer joint member 13 has a bowl-shaped mouth portion 13b and a hollow shaft-shaped stem portion 13c.
In the through hole 11b. Serration fitted at the stem 13c and further protruding from the hub wheel 11
The outer joint member 13 is connected to the hub wheel 11 by caulking the shaft end of the outboard side 13c to the outer diameter side. A small diameter step 13d is formed on the outer peripheral surface of the outer joint member 13, and the inner race 12 having a second raceway surface 17 on the outer peripheral surface is fitted into the small diameter step 13d. The inner ring 12 is press-fitted into the small-diameter step portion 13d with an appropriate interference to prevent creep. The shoulder surface of the mouth portion 13b abuts on the end surface of the inner ring 12, whereby the inner ring 12 and the hub wheel 11 are axially positioned.

The outer race 20 as the fixed body has a double-row raceway surface 21 on the inner peripheral surface. The double-row raceway surface 21 is opposed to the first raceway surface 14 on the outboard side facing the double-row raceway surface 21. Double rows of rolling elements 30 are incorporated between the second track surface 17 on the inboard side. Here, a case where a ball is used as the rolling element 30 is illustrated, but a tapered roller may be used instead of the ball.

On the outer peripheral surface of the outer ring 20, a flange portion 22 protruding outward is formed integrally. This flange portion 22 is, for the purpose of the present invention, a position biased to the outboard side,
Specifically, it is provided on the outboard side with respect to the bearing center O (the axial center between the double row raceway surfaces 21) (the axial center of the flange portion 22 is on the outboard side with respect to the bearing center O). ), A knuckle 23 extending from a suspension device, for example, a knuckle 23,
25 stopped. The knuckle 23 has a cylindrical inner peripheral surface that fits the cylindrical outer peripheral surface of the outer ring 20.
Is fitted on the outer peripheral surface on the inboard side of the flange portion 22.

The wheel rotation number detecting means 50 includes a sensing part 51 provided on the rotating side and a sensor provided on the fixed side.
It consists of 52. The sensed part 51 is a pulse generator that generates a pulse proportional to the number of rotations of the wheel, for example, by vulcanizing and molding an elastic material containing a magnetic powder and alternately arranging magnetic poles in a circumferential direction. Composed of pulsar rings. In the present invention, the sensed portion 51 is an outer peripheral surface of the rotating body 10 and a region between the first orbital surface 14 and the second orbital surface 17 (in the present embodiment, between the two orbital surfaces 14 and 17). Bearing center O
Mounted on top). On the other hand, the sensor 52 is a pulse detector for detecting a pulse signal generated by the sensing part 51 in a non-contact manner, and is constituted by, for example, an electromagnetic pickup or a semiconductor element (a Hall element, an MR element, etc.). In the present invention, the sensor 52 is held by a holding member 24 sandwiched between the end surface of the flange portion 22 of the outer ring 20 and the end surface of the knuckle 23, and its detection surface penetrates the outer ring 20 and faces the sensed portion 51. are doing. By arranging the wheel rotation speed detecting means 50 in the bearing inner space sealed by the pair of seals 40 in this manner, the pulsar ring 51 and the sensor 52 are protected from dust, salt water, stones, etc., and a special sealing mechanism is provided. Speed detection can be performed stably without providing the speed.

The holding member 24 has a ring shape whose outer peripheral shape matches the outer peripheral shape of the flange portion 22 of the outer race 20. As shown in FIG. 2, the inner peripheral surface is circular, and the outer peripheral surface is triangular or square. (In this embodiment, substantially triangular). The material of the holding member 24 is a metal such as steel. Holding member
Between the vertices of 24, there is a portion that is thin in the radial direction, and a mounting hole 24a for the sensor 52 is formed through this thin portion. The sensor 52 is inserted into the mounting hole 24a and fixed with screws or the like. At each apex of the holding member 24,
There is a bolt hole 24b for inserting the 25.

As described above, in the present invention, the holding member 24 is interposed between the flange portion 22 of the outer ring 20 and the knuckle 23, and the sensor 52 is held by the holding member 24. Is offset to the outboard side,
That is, even when the inboard side of the flange portion 22 is widely covered with the knuckle 23 and it is difficult to arrange the sensor 52 in the bearing internal space, this can be easily realized. Further, since the wheel bearing device can be formed into a unit (module) including the knuckle 23, the workability of assembling the wheel bearing device to the vehicle body is improved.

When the knuckle 23 is made of an aluminum alloy, the difference in ionization tendency between aluminum contained therein and steel, which is a bearing material, becomes large, so that members on the bearing side (outer rings, holding members, etc.) It is desirable to apply a plating treatment such as a rust prevention treatment, for example, a manganese phosphate treatment. However,
If the holding member 24 is made of resin as shown in FIG. 3, a resin material is interposed between the mating surfaces of aluminum and steel, so that the bearing member does not need to be rust-proofed, and the cost can be further reduced. . In this case, from the viewpoint of securing the strength and the like, it is desirable to form a metal around the bolt hole 24b by fitting a metal ring 25 of steel or the like into each apex portion of the holding member 24.

FIG. 4 shows an example in which the inner race 12 of the rotating body 10 is eliminated and the second raceway surface 17 is directly provided on the outer peripheral surface of the mouth portion 13a of the outer joint member 13. The flange portion 22 and the knuckle 23 of the outer race 20 are shown in FIG. The same effect as in FIG. 1 can be obtained by interposing the holding member 24 with the sensor 52 between them. Other configurations are the same as those in FIG. 1, and thus common members and elements are denoted by common reference numerals, and redundant description is omitted.

FIG. 5 shows another example of a connection structure between the hub wheel 11 and the outer joint member 13.
Are fitted, and the fitted portion is swaged at least partially by increasing or decreasing the diameter. For example, caulking is performed by increasing the diameter of the hollow stem portion 13c of the outer joint member 13 from the inner diameter side to the outer diameter side (illustrated example), or by reducing the diameter of the hub wheel 11 from the outer diameter side to the inner diameter side. Can be tightened. By forming the uneven portion 18 on one or both of the fitting surface of the hub wheel 11 and the fitting surface of the outer joint member 13, the uneven portion 18 of one of the fitting surfaces is formed.
Penetrates into the uneven portion of the other fitting surface and causes plastic deformation, thereby achieving a strong connection and preventing loosening.
Other configurations are the same as those in FIG. 1, and thus common members and elements are denoted by common reference numerals, and redundant description is omitted.

In the above description, a wheel bearing device for a drive wheel in which the outer joint member 13 of the constant velocity universal joint J is connected to the hub wheel 11 is exemplified. However, the present invention does not connect the outer joint member. The present invention can be similarly applied to a wheel bearing device for a driven wheel.

[0025]

According to the present invention, even when the flange portion of the fixed body is located at a position deviated to the outboard side, it is possible to add a wheel rotation speed detecting means to the wheel bearing device, and particularly to stabilize the operation of the sensor. This can be easily arranged in the bearing internal space which is advantageous in terms of performance. Further, the wheel bearing device can be formed into a unit (module) including a mounting member on the vehicle body side, so that workability in assembling the vehicle body is improved.

[Brief description of the drawings]

FIG. 1 is an axial sectional view showing an embodiment of the present invention, and is a sectional view taken along line AA in FIG.

FIG. 2 is a radial cross-sectional view illustrating an example of a holding member.

FIG. 3 is a radial cross-sectional view showing another example of a holding member.

FIG. 4 is an axial sectional view showing another embodiment of the present invention, and is a sectional view taken along line AA in FIG. 2;

FIG. 5 is an axial sectional view showing another embodiment of the present invention, and is a sectional view taken along line AA in FIG. 2;

FIG. 6 is an axial sectional view of a conventional product.

[Explanation of symbols]

 10 Rotating body 11 Hub wheel 12 Inner ring 13 Outer joint seating material 14 First raceway surface (Rotating body side) 17 Second raceway surface (Rotating body side) 20 Fixed body (Outer ring) 21 Raceway surface (Fixed body side) 22 Flange part 24 Holding member 25 Bolt 51 Sensing part 52 Sensor J Constant velocity universal joint

Claims (8)

[Claims] 1. A rotating body having a double-row raceway surface to which wheels are fixed, a fixed body having a double-row raceway surface, and a flange for fixing to a mounting member on the vehicle body side, and a rotating body. And a double row of rolling elements interposed between the respective raceway surfaces of the fixed body, and rotatably supporting the wheel with respect to the vehicle body. A wheel bearing device comprising a sensing part and a sensor facing the sensed part held by a holding member sandwiched between the flange part of the fixed body and the mounting member. 2. The wheel bearing device according to claim 1, wherein the rotating body has a hub wheel and an inner ring fitted to the hub wheel. 3. The double raceway surface of the rotating body, wherein one raceway surface is provided on the hub wheel and the other raceway surface is provided on the inner race.
The wheel bearing device according to the above. 4. The wheel bearing device according to claim 1, wherein the rotating body has a hub wheel and an outer joint member of a constant velocity universal joint coupled to the hub wheel. 5. The wheel bearing device according to claim 4, wherein, of the multiple rows of raceways of the rotating body, one raceway is provided on the hub wheel and the other raceway is provided on the outer joint member of the constant velocity universal joint. 6. The hub wheel and the outer joint member are connected by fitting the two together and by caulking at least partially expanding or reducing the diameter of the fitting portion. Wheel bearing device. 7. The fixing member according to claim 1, wherein the flange portion, the holding member, and the vehicle-body-side mounting member are connected by bolts.
The wheel bearing device according to any one of the above. 8. The wheel bearing device according to claim 7, wherein the holding member is made of resin, and the periphery of the bolt hole is made of metal.