JP2004132497A - Rolling bearing device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To reduce the weight, and to make a knuckle 6 different in a diameter fittable by using a common outer race 22 in a rolling bearing device suitable for rotatably supporting a wheel on a car body in a vehicular hub unit. <P>SOLUTION: This rolling bearing device includes an inner race member becoming a rotary wheel by installing a wheel, an outer race member becoming a fixed wheel by being fixed to the car body, a ball group 27 rollingly arranged between the inner race member and the outer race member and a thin plate sensor cover 5 fixed to the outer race member and hiding a shaft directional one end opening of the outer race member. The outer race member is composed of the outer race 22 composed of an annular ring part 30 having outer race raceway tracks 25 and 26 on an inner peripheral surface and a flange part 31 projected on an outer peripheral surface on the shaft directional one end side of the annular ring part 30. The knuckle 6 is fixed to a shaft directional one end side surface of the flange part 31, and a spigot part 52 is formed in the sensor cover 5 for positioning the knuckle 6 in the radial direction. <P>COPYRIGHT: (C)2004,JPO

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a rolling bearing device suitable for rotatably supporting wheels on a vehicle body in a vehicle hub unit.
[0002]
[Prior art]
2. Description of the Related Art Conventionally, for control of an anti-lock brake system (ABS) and the like, a vehicle hub unit including a rotation detector that detects a rotation speed and a rotation direction of a wheel has been proposed (for example, see Patent Document 1). .
[0003]
FIG. 6 shows an example of a rolling bearing device applied to a vehicle hub unit with a built-in sensor. The left side of the figure is the vehicle outer side, and the right side is the vehicle inner side.
[0004]
The rolling bearing device includes a hub wheel 1, a rolling bearing 2, and a rotation detector 4.
[0005]
The hub wheel 1 includes a shaft portion 11 and a hub flange 12 for fixing the wheel. A rolling bearing 2 composed of double rows of angular ball bearings is mounted on the outer periphery of the shaft portion 11.
[0006]
The rolling bearing 2 includes an inner ring 21 as a rotating wheel, an outer ring 22 as a fixed ring, a ball group 27 in two rows, and the like.
[0007]
The rotation detector 4 is press-fitted and fixed to the inner ring 21, and is fitted into the inner peripheral surface of a pulsar ring 41 composed of an annular core 45 and a magnetic body 46, and an outer ring filing portion 34 extending toward the vehicle inner side of the outer ring 22. The magnetic sensor 47 is mounted on the sensor cover 5 and includes the magnetic detecting element 42 and the like.
[0008]
The outer ring 22 has a flange portion 31 on the outer peripheral surface, and the knuckle 6 radially positioned on the outer peripheral surface of the outer ring annulus portion 34 is bolted to the bolt insertion hole 32 of the flange portion 31 and fixed to the vehicle body. That is, when the hub unit is mounted on the vehicle side, the outer ring 22 is formed with the outer ring anchor portion 34 as a reference for mounting the knuckle 6 and the hub unit.
[0009]
Thus, the wheels are rotatably supported by the vehicle body via the rolling bearings 2.
[0010]
[Patent Document 1]
Japanese Patent Application Laid-Open No. H11-174069
[Problems to be solved by the invention]
In the rolling bearing device shown in FIG. 6, the outer ring 22 is integrally formed with the outer ring anchor portion 34 for positioning the knuckle 6. The outer ring 22 is made of hot forged bearing steel, has a large mass, and is integrally formed with the outer ring annulus portion 34, so that the outer ring 22 becomes heavier, and it is desired that the rolling bearing 2 be reduced in weight.
[0012]
In addition, since the outer ring anchoring portion 34 is integrally formed with the outer ring 22, the knuckles 6 having different diameters could not be attached to the flange portion 31. That is, the knuckle 6 is positioned radially in contact with the inner peripheral surface of the outer ring annulus portion 34 and is bolted to the flange portion 31. If the inner diameter of the knuckle 6 is different, the outer ring of the knuckle 6 has a corresponding outer diameter. It is necessary to use the outer ring 22 having the brazing portion 34. However, when the outer ring 22 corresponding to the knuckle 6 is prepared, the types of the outer ring 22 increase, and the outer ring 22 is forged, and it takes time and effort to manufacture a plurality of types of the outer ring 22, and inventory management becomes complicated. The problem arises.
[0013]
[Means for Solving the Problems]
A rolling bearing device according to the present invention includes an inner ring member to which wheels are attached and which serves as a rotating wheel, an outer ring member which is fixed to a vehicle body and serves as a fixed wheel, and a rolling member rotatably provided between the inner ring member and the outer ring member. A moving body, a thin-plate cover fixed to the outer ring member and concealing one axial opening of the outer ring member, wherein the outer ring member has an annular portion having an outer raceway on an inner peripheral surface; An outer ring composed of a flange portion protruding from an outer peripheral surface at one axial side of the portion, a vehicle body fixing member is fixed to one axial side surface of the flange portion, and the vehicle body fixing member is radially attached to the cover. In this case, a portion to be positioned is formed.
[0014]
Examples of the type of the rolling bearing including the inner ring member, the outer ring member, and the rolling element include, for example, double row outward-facing angular ball bearings, and various types of oblique rolling bearings such as tapered rollers.
[0015]
As the vehicle body fixing member, a knuckle, a carrier, or the like can be given.
[0016]
The cover may simply cover the one end in the axial direction of the outer ring member, or may be a sensor cover for mounting a sensor.
[0017]
Examples of the material of the cover made of a thin plate include cold-rolled steel plates (SPCC, SPCD, SPCE) and resins such as fiber-reinforced plastics.
[0018]
According to the rolling bearing device of the present invention, the anchor portion for positioning the vehicle body fixing member is formed on the cover separate from the outer ring. The cover is made of a thin plate and is lightweight. Even if the cover is formed, the mass does not increase, the cover can be reduced from the heavy outer ring, and the weight of the rolling bearing device can be reduced.
[0019]
In addition, since the filing portion is formed on a cover separate from the outer ring, when attaching a vehicle body fixing member having a different diameter to the flange portion of the outer ring, the filing portion corresponding to the diameter of the vehicle body fixing member is used. By using the cover provided, the vehicle body fixing member can be positioned at the hood and attached to the flange. Thus, by using a common outer ring and replacing only the cover according to the diameter of the vehicle body fixing member, various vehicle body fixing members having different diameters can be attached to the outer ring.
[0020]
BEST MODE FOR CARRYING OUT THE INVENTION
An embodiment of the present invention will be described with reference to FIGS.
[0021]
FIG. 1 is a cross-sectional view of the rolling bearing device according to the present embodiment, FIG. 2 is a front view of the outer ring on the vehicle inner side, and FIG. 3 is a front view of the sensor cover on the vehicle inner side. The left side of FIG. 1 is the vehicle outer side, and the right side is the vehicle inner side.
[0022]
The rolling bearing device according to the present embodiment is applied to a vehicle hub unit, and includes a hub wheel 1, a rolling bearing 2, and a rotation detector 4.
[0023]
The hub wheel 1 has a shaft portion 11 and a hub flange 12 for fixing the wheel. On the outer periphery of the shaft portion 11 of the hub wheel 1, a rolling bearing 2 composed of double rows of angular ball bearings is mounted.
[0024]
The rolling bearing 2 includes an inner ring 21 serving as a rotating wheel, which is press-fitted and fixed to the outer periphery of the shaft portion 11 on the vehicle inner side, an outer ring 22 serving as a fixed wheel, and an inner raceway 23 formed on the shaft portion 11 and the inner ring 21. 24, two rows of ball groups 27 as rolling elements, which are arranged so as to roll freely along outer ring tracks 25, 26 formed on the outer ring 22, a cage 28 holding the ball groups 27 in each row, and an outer ring 22. And a seal member 29 interposed between the shaft portion 11.
[0025]
The outer race 22 is made of high carbon chromium bearing steel such as SUJ2 by hot forging, and has an annular portion 30 having outer raceways 25 and 26 formed on an inner peripheral surface thereof, and an axial direction at an inner end of the annular portion 30 on the vehicle inner side. It comprises four flange portions 31 protruding radially outward on one end side and having bolt insertion holes 32. That is, the flange portion 31 is located on the outer diameter side of the ball group 27 on the vehicle inner side.
[0026]
The inner ring member includes the hub wheel 1 and the inner ring 21. The outer race member is constituted by the outer race 22.
[0027]
The rotation detector 4 is an active sensor, and includes a pulsar ring 41 press-fitted and fixed to the inner race 21 and a magnetic sensor 47 mounted on the sensor cover 5.
[0028]
The pulsar ring 41 includes a non-magnetic annular metal bar 45 press-fitted and fixed to the inner race 21 and a magnetic material 46 vulcanized and bonded to the annular metal core 45 on the vehicle inner side. The magnetic body 46 is made of synthetic rubber or synthetic resin containing magnetic powder, and is formed by alternately magnetizing N poles and S poles in the circumferential direction.
[0029]
The magnetic sensor 47 is composed of a magnetic detection element 42 that changes its output in accordance with the flow direction of magnetic flux such as a Hall element or a magnetic resistance element, and an IC or the like that incorporates a waveform shaping circuit that adjusts the output waveform of the magnetic detection element 42. The magnetic detection element 42 is fixed to the bottom 50 of the sensor cover 5 so as to face the magnetic body 46.
[0030]
The sensor cover 5 is formed by press-forming a thin steel plate into a bottomed cylindrical shape having an opening on the vehicle outer side. That is, the bottom portion 50, a small-diameter annular portion 51 on the vehicle inner side, a large-diameter annular portion 52 on the vehicle outer side, and a step portion 57 between the small-diameter annular portion 51 and the large-diameter annular portion 52, A rising portion 56 rising in the outer diameter direction at the opening edge of the ring portion 52, and four protruding pieces 53 projecting in the outer diameter direction at positions corresponding to the flange portions 31 of the outer ring 22 in the rising portion 56. The projecting piece 53 has a bolt insertion hole 54 facing the bolt insertion hole 32 of the flange portion 31. Further, a locking piece 55 is bent at the tip of each protruding piece 53 and on the outer periphery of the rising portion 56 between the protruding pieces 53.
[0031]
The sensor cover 5 makes the rising portion 56 and each protruding piece 53 abut against the inner side surface of the outer race 22, and hooks and locks the locking piece 55 at the tip of the protruding piece 53 to the tip of the flange portion 31. The locking piece 55 on the outer periphery of the rising portion 56 is hooked on the outer peripheral surface of the outer ring 22 between the flange portions 31 to be latched and temporarily fixed, and one axial opening of the outer ring 22 is concealed including the end surface of the shaft portion 11. I do.
[0032]
The position where the locking piece 55 is formed is not particularly limited, and may be formed, for example, over the entire periphery of the opening edge of the sensor cover 5 on the vehicle outer side.
[0033]
The outer ring 22 is fixed to the vehicle body via a knuckle 6 which is a vehicle body fixing member connected to the vehicle body. The knuckle 6 is positioned in the radial direction on the outer peripheral surface of the large-diameter annular portion 52 that becomes the enamel portion of the sensor cover 5, and bolts are inserted into the knuckle 6, the projecting piece 53, and the bolt insertion holes 54, 32 of the flange portion 31. Insert and fix with nuts. Thereby, the outer ring 22 and the sensor cover 5 are aligned, and the sensor cover 5 is fixed to the outer ring 22. The sensor cover 5 may be fixed to the flange portion 31 by bonding with an adhesive or the like, and in this case, the locking piece 55 may not be provided and the sensor cover 5 may be directly bonded with an adhesive. .
[0034]
When positioning the knuckle 6, the inner peripheral surface of the knuckle 6 is radially positioned by contacting the outer peripheral surface of the large-diameter ring portion 52. At this time, the knuckle 6 may be loosely fitted to the enamel portion 52 in a state where a slight gap is formed between the inner peripheral surface of the knuckle 6 and the outer peripheral surface of the large diameter ring portion 52. . That is, after assembly, no force acts on the sensor cover 5 from the knuckle 6, and there is no problem even if the gap is formed as described above.
[0035]
Thus, the wheels are rotatably supported by the vehicle body via the rolling bearings 2.
[0036]
According to the rolling bearing device configured as described above, the wax portion 52 for positioning the knuckle 6 is formed on the sensor cover 5 separate from the outer ring 22. The sensor cover 5 is a lightweight material made of a thin steel plate, and the weight does not increase even if the heat sink portion 52 is formed. In addition, the outer ring 22, which is a heavy material of hot forging made of bearing steel, includes the annular portion 30 and the flange portion 31, so that the outer ring is not required, and the weight of the rolling bearing device can be reduced.
[0037]
In addition, since the filler portion 52 is formed on the sensor cover 5 separate from the outer ring 22, when the knuckles 6 having different diameters are attached to the flange portion 31 of the outer ring 22, the knuckles 6 correspond to the diameter of the knuckle 6. The knuckle 6 can be positioned on the hood portion 52 and attached to the flange portion 31 by using the sensor cover 5 having the hood portion 52 having an outer diameter. As described above, by using the common outer ring 22 and replacing only the sensor cover 5 in accordance with the diameter of the knuckle 6, various knuckles 6 having different diameters can be attached to the outer ring 22, thereby improving versatility.
[0038]
Furthermore, since the outer ring 22 does not have the outer ring anchoring portion, the step of forming the outer ring anchoring portion is not required, so that the productivity of the outer ring 22 is improved and the cost can be reduced.
[0039]
The sensor cover 5 is formed in a bottomed cylindrical shape having an opening on the vehicle outer side, and has a bottom portion and a ring portion. The ring portion has a stepped portion having an outer diameter in contact with the inner peripheral surface of the knuckle 6. And may be formed in the same diameter without any.
[0040]
FIG. 4 is a sectional view of a rolling bearing device according to a modification of the present invention. In addition, the left side of the figure is the vehicle outer side, and the right side is the vehicle inner side.
[0041]
This example is characterized in that the rotation detector 4 is an active sensor and includes a pulsar ring 41 and a magnetic sensor 47 attached to the sensor cover 5.
[0042]
The pulsar ring 41 includes a non-magnetic annular metal bar 45 press-fitted and fixed to the inner race 21 and a magnetic material 46 vulcanized and bonded to the annular metal core 45 on the vehicle inner side. The magnetic body 46 is made of synthetic rubber or synthetic resin containing magnetic powder, and is formed by alternately magnetizing N poles and S poles in the circumferential direction.
[0043]
The magnetic sensor 47 is composed of a magnetic detecting element such as a Hall element or a magnetoresistive element that changes its output in accordance with the flow direction of magnetic flux, an IC incorporating a waveform shaping circuit for adjusting the output waveform of the magnetic detecting element, and the like. The magnetic detection element is opposed to the magnetic body 46 and is penetrated and fixed to a step 57 between the small-diameter ring portion 51 and the large-diameter ring portion 52 of the sensor cover 5.
[0044]
When the pulsar ring 41 fixed to the inner ring 21 rotates with the rotation of the shaft portion 11, the magnetic sensor 47 detects a change in the magnetic flux of the pulsar ring 41, and detects the rotation speed and rotation direction of the wheel.
[0045]
The other configuration is the same as that of the example shown in FIGS. 1 to 3, and the same effect can be obtained.
[0046]
Further, the diameter of the annular magnetic body 46 can be increased by using the internal space of the hollow large-diameter annular portion 52 of the sensor cover 5 to increase the radial length of the annular core 45. Thereby, the diameter detected by the magnetic sensor 47 is increased, and the sensor accuracy is improved.
[0047]
The pulsar ring 41 and the magnetic sensor 47 may be configured as a so-called radial sensor in which the pulsar ring 41 and the magnetic sensor 47 face each other in the radial direction by using the internal space of the large-diameter annular portion 52.
[0048]
Further, the magnetic sensor 47 may be arranged outside the sensor cover 5 so that the magnetic sensor 47 faces the magnetic body 46 with the step 57 or the bottom 50 interposed therebetween. In this case, it is not necessary to provide a through hole for fixing the magnetic sensor 47 in the sensor cover 5, and the sealing performance of the sensor cover 5 is improved.
[0049]
FIG. 5 is a sectional view of a rolling bearing device according to another modification of the present invention. In addition, the left side of the figure is the vehicle outer side, and the right side is the vehicle inner side.
[0050]
In this example, the sensor cover 5 includes a bottom portion 50, a small-diameter annular portion 51 on the vehicle inner side, a large-diameter annular portion 52 on the vehicle outer side, and a stepped portion 57, and is formed in a tubular shape with the vehicle outer side opened. It is characterized by having been done.
[0051]
The sensor cover 5 press-fits the open end 58 of the large-diameter ring portion 52 into a cutout 33 formed in the inner diameter portion of the inner surface of the outer ring 22 on the inner side of the vehicle. And conceal.
[0052]
The knuckle 6 is positioned on the outer peripheral surface of the large-diameter ring portion 52 that is to be the enrobing portion of the sensor cover 5, and a bolt is inserted into the bolt insertion hole 32 of the flange portion 31 and fixed with a nut.
[0053]
The other configuration is the same as that of the example shown in FIGS. 1 to 3, and the same effect can be obtained.
[0054]
【The invention's effect】
ADVANTAGE OF THE INVENTION According to the rolling bearing device of this invention, weight reduction is achieved, and the effect that the vehicle body fixing members with different diameters can be positioned and attached to the outer ring using the common outer ring is obtained.
[Brief description of the drawings]
FIG. 1 is a cross-sectional view of a rolling bearing device according to an embodiment of the present invention. FIG. 2 is a front view of an outer ring of a vehicle inner side according to an embodiment of the present invention. FIG. 3 is a front view of a sensor cover according to an embodiment of the present invention. FIG. 4 is a sectional view of a rolling bearing device according to a modified example of the present invention. FIG. 5 is a sectional view of a rolling bearing device according to another modified example of the present invention. FIG. 6 is a sectional view of a rolling bearing device according to a conventional example. Description]
2 Rolling bearing 4 Rotation detector 5 Sensor cover (cover)
6 Knuckle (body fixing member)
21 Inner ring (rotating wheel)
22 Outer ring (fixed ring)
23, 24 Inner ring track 25, 26 Outer ring track 27 Ball group (rolling element)
52 Large Diameter Ring (Inro)

Claims (3)

An inner ring member to which a wheel is attached to be a rotating wheel; an outer ring member fixed to a vehicle body to be a fixed wheel; a rolling element rotatably provided between the inner ring member and the outer ring member; and fixed to the outer ring member. And a cover made of a thin plate that conceals one axial end opening of the outer ring member,
The outer ring member is configured by an outer ring including an annular portion having an outer ring raceway on an inner peripheral surface, and a flange portion protruding from an outer peripheral surface at one axial end of the annular portion,
A rolling bearing device, wherein a body fixing member is fixed to one end side surface in the axial direction of the flange portion, and a wax portion for radially positioning the body fixing member is formed on the cover. An inner ring serving as a rotating wheel provided on the outer peripheral surface of the hub wheel to which the wheel is attached; an outer ring fixed to the vehicle body and serving as a fixed wheel; a rolling element rotatably provided between the inner wheel and the outer wheel; A thin plate sensor cover fixed to the outer ring and concealing one axial opening of the outer ring;
The outer ring includes an annular portion having an outer ring raceway on an inner peripheral surface, and a flange portion protruding from an outer peripheral surface at one axial end of the annular portion,
A knuckle is fixed to one axial side surface of the flange portion, and a wax portion for radially positioning the knuckle is formed on the sensor cover. The rolling bearing device according to claim 2,
The sensor cover is formed in a bottomed cylindrical shape with the other axial end opened, and has a tubular wax portion that can contact the inner peripheral surface of the knuckle and radially position the knuckle, and A rolling bearing device, comprising: a projecting piece bolted to the flange portion together with the knuckle at the other end in the axial direction.

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