JP2000211311A - Bearing device for axle - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent a reduction in detection performance by eliminating the adhesion of iron powder or the like, and obviate the need for adjusting a gap after bearing integration, by integrating a pulser part and a sensor part in which the gap has been adjusted, into a bearing, and seal the sensor part with a seal member. SOLUTION: An annular member 5 is secured to an outer ring 1 of a pipe member 6. Further, an annular member 8 is secured to an inner ring 2 of a pipe member 9. Furthermore, a portion between the inner and outer rings 2, 1 is sealed by a seal member 11. Then, a pulser part 13 is disposed on the inner peripheral face of the pipe member 6, and a sensor part 14 which includes a detector for detecting a rotation speed is disposed on a side face on the inside of a bearing so as to be opposed to the pulser part 13. Accordingly, the pulser part 13 and the sensor part 14 are placed on the inside of the bearing sealed by the seal member 11, so that iron powder, dust, muddy water or the like from outside will not adhere. Further, the pulser part 13 and the detector of the sensor part 14 are opposing each other in the radius direction, so that there is no need to adjust a gap between the pulser part 13 and the sensor part 14.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an axle bearing device for detecting, for example, the rotational speed of a vehicle wheel by a sensor.

[0002]

2. Description of the Related Art Conventionally, as an axle bearing device provided with a wheel rotation speed detecting portion, a rolling device is provided between an outer ring fixed to a wheel side, an inner ring concentric with the outer ring and fixed to the vehicle body, and an inner ring. A rolling element movably arranged and held on the circumference by a retainer, a pulsar ring press-fitted and fixed to an end outer peripheral surface of an outer ring, and a rotation speed detected in opposition to the pulsar ring attached to the vehicle body side. A structure having a sensor unit is known.

[0003]

However, in the above-described conventional axle bearing device, after the bearing having the outer ring to which the pulsar ring is fixed is incorporated, the sensor portion is separately attached to the vehicle body side. The gap with the sensor unit tends to be large, and adjustment of the gap is troublesome. In addition, since the pulsaring and the detection portion of the sensor portion are exposed, there is a problem that iron powder easily adheres and the detection performance tends to deteriorate.

It is an object of the present invention to provide an axle bearing device which does not require a gap adjustment between a pulsar portion and a sensor portion after the bearing is incorporated, and has no iron powder attached to a detection portion.

[0005]

Means for Solving the Problems As means for solving the above problems, in the invention of claim 1, an outer ring fixed to a wheel side and an inner ring fixed concentrically to the outer ring and to a vehicle body side are provided. In the axle bearing device having a rolling element that is arranged to be rollable between the inner and outer wheels and held on the circumference by a retainer, and a rotation speed detection unit that detects an outer ring rotation speed,
A first solid body consisting of a first radially outer flange contacting the outer ring end face and a first cylindrical body fitted to an end inner peripheral surface of the outer ring is fitted and fixed to the outer ring, and the outer side of the bearing. A second annular body composed of the formed second radially outer flange and a second cylindrical body fitted to the end outer peripheral surface of the inner ring is fitted and fixed to the inner ring, and the first flange and the second A seal is provided between the flanges to form a sealed portion, a pulsar portion is provided on the peripheral surface of the first cylindrical body, and a sensor portion is provided on the second flange to face the pulsar portion and detect a rotational speed. It is characterized by having.

According to the second aspect of the present invention, the outer ring fixed to the wheel side, the inner ring fixed concentrically to the outer ring and fixed to the vehicle body, and the retainer are rotatably arranged between the inner and outer wheels. In a bearing device for an axle having a rolling element held on a circumference at a circumference and a rotation speed detector for detecting an outer ring rotation speed, a first radial outer flange contacting the outer ring end face and an end of the outer ring. A first cylindrical body, which is fitted to the inner circumferential surface of the first cylindrical body, is fitted and fixed to the outer ring, and a second radially outer flange formed on the outer side of the bearing and an outer circumferential surface of an end portion of the inner ring. A second annular body composed of a second cylindrical body to be fitted is fitted and fixed to the inner ring, and a seal is formed between the first flange and the second flange to form a sealed portion. A third radially inner flange is formed on the inner side of the bearing of the cylindrical body, and the bearing of the third flange is formed. Provided with a pulsar portion in the side surface parts side, characterized in that a sensor which detects the rotation speed to face the pulser unit to said second flange.

[0007]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The details of the present invention will be described based on embodiments shown in the drawings. The axle bearing device shown in FIGS. 1 and 2 is capable of rolling between an outer ring 1 fixed to the wheel side, an inner ring 2 concentric with the outer ring 1 and fixed to the vehicle body side, and the inner and outer rings 2, 1. It basically has rolling elements 4 arranged and held on a circumference by a retainer 3. And the first cylinder 6
And a first flange 7 extending radially outward from one end, and is fixed to the outer ring 1 by press-fitting the first cylindrical body 6 to the inner circumferential surface at the end of the outer ring 1. . At this time, the first flange 7 is in contact with the outer ring 1 end surface 1a.
Further, the second annular body 8 composed of the second cylindrical body 9 and the second flange 10 extending radially outward from one end is provided on the second flange 1.
The second cylindrical body 9 is fixed to the inner race 2 by press-fitting to the outer peripheral surface of the end of the inner race 2 so that 0 is located outside the bearing.

Further, a seal body 11 is fixed to the tip of the first flange 7, and an inner lip 11 of the seal body 11 is fixed.
a is brought into contact with the inner peripheral surface of the third annular body 12 having an L-shaped cross section formed at the distal end of the second flange 10, and the space between the inner and outer rings 2 and 1 is sealed.

A pulsar section 13 is provided on the inner peripheral surface of the first cylindrical body 6, and a detecting section for detecting the rotational speed facing the pulsar section 13 is provided on a side surface of the second flange 10 inside the bearing. The provided sensor unit 14 is provided. A harness 15 is connected to the sensor unit 14. The pulsar section 13 may be formed by a plurality of ridges formed at equal intervals on the circumference, or alternatively, N poles and S poles are alternately magnetized at equal intervals. It may be formed by fixing the member, or may be other known means,
In short, it is sufficient that the rotation speed is detected in cooperation with the sensor unit 14.

FIG. 3 shows another embodiment, in which the position of a pulsar section 13 is different from that of the embodiment shown in FIG. That is, in FIG. 3, a third flange 16 is formed radially inward from the end of the first cylindrical body 6 on the bearing inside side, and the pulsar portion 13 is provided on a side surface of the third flange 16 outside the bearing. In addition, a sensor unit 14 provided with a detection unit for detecting the rotational speed facing the pulsar unit 13 is provided on a side surface of the second flange 10 on the inner side of the bearing.

In each of the above embodiments, the pulsar section 13 and the sensor section 14 are located inside the bearing sealed by the seal body 11, so that external iron powder, dust, muddy water and the like do not adhere. I have. In the embodiment of FIG. 1, the pulsar unit 13 and the detection unit of the sensor unit 14 are opposed to each other in the radial direction, so that the gap between the pulsar unit 13 and the detection unit of the sensor unit 14 can be easily adjusted. Further, in the embodiment shown in FIG. 3, since the pulser section 13 and the detection section of the sensor section 14 are opposed to each other in the axial direction, the gap can be easily made constant over the entire length of the detection section in the circumferential direction.

[0012]

As described above in detail, according to the axle bearing device of the present invention, since the unit in which the sensor portion and the pulsar portion whose gap has been adjusted is incorporated in the bearing, the gap adjustment after assembling the bearing is unnecessary. , Which makes it easy to incorporate the bearing. Further, since the sensor section is sealed by the seal body, there is no adhesion of iron powder or the like, and the detection performance is prevented from lowering.

[Brief description of the drawings]

FIG. 1 is a sectional view of an embodiment of the present invention.

FIG. 2 is an enlarged view of a main part of FIG.

FIG. 3 is a cross-sectional view of another embodiment of the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Outer ring 2 Inner ring 3 Cage 4 Rolling element 5 First integral body 6 First cylindrical body 7 First flange 8 Second annular body 9 Second cylindrical body 10 Second flange 11 Seal body 12 Third annular body 13 Pulser section 14 Sensor section

Claims (2)

[Claims] 1. An outer ring fixed to a wheel side, an inner ring concentric with the outer ring and fixed to a vehicle body, and rollably disposed between the inner and outer wheels and held on a circumference by a retainer. In the axle bearing device having the rolling element and the rotation speed detecting unit for detecting the rotation speed of the outer ring, the first radial outer flange contacting the end surface of the outer ring and the inner peripheral surface of the end portion of the outer ring are fitted. A first cylindrical body fitted with the first cylindrical body is fixedly fitted to the outer ring, and a second cylindrical body fitted to a second radially outer flange formed on the outer side of the bearing and an end outer peripheral surface of the inner ring. A second annular body consisting of: is fitted and fixed to the inner race, a seal is formed between the first flange and the second flange to form a sealed portion, and a pulsar portion is formed on the inner peripheral surface of the first cylinder. Along with
A bearing device for an axle, wherein a sensor unit for detecting a rotation speed is provided on the second flange so as to face the pulsar unit. 2. An outer ring fixed to the wheel side, an inner ring fixed concentrically to the outer ring and to the vehicle body, and rotatably disposed between the inner and outer wheels and held on a circumference by a retainer. In the axle bearing device having the rolling element and the rotation speed detecting unit for detecting the rotation speed of the outer ring, the first radial outer flange contacting the end surface of the outer ring and the inner peripheral surface of the end portion of the outer ring are fitted. A first cylindrical body fitted with the first cylindrical body is fixedly fitted to the outer ring, and a second cylindrical body fitted to a second radially outer flange formed on the outer side of the bearing and an end outer peripheral surface of the inner ring. A second annular body consisting of: is fitted and fixed to the inner ring, a seal is formed between the first flange and the second flange to form a sealed portion, and a bearing inside the first cylindrical body is provided on the inner side of the bearing. A third radially inner flange is formed, and a pulsar portion is provided on a side surface of the third flange on the outer side of the bearing. In both cases, a bearing unit for an axle, wherein a sensor unit for detecting a rotation speed is provided on the second flange so as to face the pulsar unit.