JP2588071Y2 - Axle bearing device - Google Patents

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, a rotational speed of a wheel of an automobile by a detector.

[0002]

2. Description of the Related Art Conventionally, as an axle bearing device provided with a wheel rotational speed detector, one disclosed in Japanese Patent Laid-Open Publication No. Hei 3-6457 is known. This axle bearing device includes an outer ring member fixed to the vehicle body, an inner ring member attached to the wheel,
A rolling member rotatably disposed between the outer ring members, and a plurality of rolling members attached to an end of the inner ring member and having a constant circumferential interval on an axial inner peripheral surface of a concave portion formed at an axial outer end. A detection member having a substantially U-shaped cross section, a cover fixed to the outer ring member and covering the concave portion, and an electromagnetic induction fixed to the outer ring member having a detection portion facing the detection member. And a rotational speed detector of the type, and the rotational speed of the wheel is detected by this configuration.

[0003]

However, in the above-described conventional axle bearing device, the end portion of the rotational speed detector is provided only for a plurality of protrusions formed on the inner circumferential surface of the concave portion of the detected member in the axial direction. However, since the rotation speed is detected to face each other, the flow of the magnetic flux becomes only one side toward the outside, and there is a problem that it is difficult to increase the detection output. Therefore, an object of the present invention is to provide an axle bearing device capable of improving detection output with a simple configuration.

[0004]

As means for solving the above problems, there are provided an outer ring member fixed to a vehicle body, an inner ring member attached to wheels, and a rolling member rotatably arranged between the inner and outer ring members. A member having a substantially U-shaped cross section and having a plurality of protrusions attached to an end of the inner ring member and having a constant interval in the circumferential direction on an axial inner circumferential surface of a concave portion formed at an axial outer end. An axle bearing device, comprising: a member, a cover fixed to the outer ring member and covering the concave portion, and a rotation speed detector having a detection portion facing the detected member and fixed to the outer ring member. An axially projecting member having an outer peripheral surface opposed to the inner peripheral surface of the concave portion in the radial direction at a predetermined interval in the radial direction is integrally provided on a radially inner wall of the concave portion of the detection member. Multiple protrusions are formed at regular intervals in the direction Is, the sensing portion of the rotational speed detector, characterized in that it is constituted by a position with both projections with a predetermined radial clearance between the projections of the projection and the axial projection of the concave inner circumferential face.

[0005]

In the axle bearing device having the above structure, the detection portion of the detected portion is positioned so as to be sandwiched between the projections arranged inside and outside so as to face each other in the radial direction. Flows twice through the inner and outer protrusions, so that the output of detecting the rotational speed is improved.

[0006]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A specific embodiment of the present invention will be described below with reference to the drawings. FIG. 1 is an axial sectional view of a main part of an axle bearing device according to an embodiment of the present invention.
That is, 1 is an outer ring member fixed to a vehicle body (not shown),
Reference numeral 2 denotes an inner ring member attached to a wheel (not shown), and reference numeral 3 denotes a rolling member held between the inner and outer ring members 1 and 2 by a retainer 4 and rotatably disposed. The inner ring 21 which constitutes a part of the inner ring member 2 and forms the track of the rolling member is
The nut 5 is fixed to a shaft 22 that forms a part of the inner ring member 2.

At the end of the shaft 22, which is a part of the inner ring member 2, a detection member 6 having a substantially U-shaped cross section and having a concave portion 61 formed at the outer end in the axial direction is attached. A plurality of projections 63 are formed on the inner peripheral surface 62 in the axial direction of the concave portion 61 of the detected member 6 at regular intervals in the circumferential direction. Further, an axially projecting member 7 having an outer peripheral surface 71 provided at a predetermined interval opposed to the axial inner peripheral surface 62 is integrally formed on the radial inner wall 64 of the concave portion 61. On an outer peripheral surface 71 of the axially protruding member 7, a plurality of protrusions 72 are formed at regular intervals in the circumferential direction. The protrusion 63
It is preferable that the numbers of the protrusions and the protrusions 72 are the same.
In the embodiment, the detection member 6 is fixed to the shaft 22 by press-fitting the end of the shaft 22 into a through hole formed in the center of the axial fixing member 7. It is not limited. Further, the nut 5 itself is connected to the detected member 6.
The member to be detected may also be used as a shape similar to that described above.

At the end of the outer ring 1, the detected member 6
The cover 8 that covers the concave portion 61 is fixed so that external water or the like does not enter the detected member 6. Also, the cover
A synthetic resin housing 10 which is a non-magnetic material integrally molded with a rotational speed detector 9 is attached to the housing 8. The synthetic resin housing 10 has holes 8 of the cover 8.
1, a detecting portion 91 made of, for example, an iron-based material or a magnetic material is provided to protrude in the axial direction so as to be sandwiched between the respective protrusions 63 and 72 of the detected member 6 with a predetermined radial gap. I have. A radial interval between each of the projections 63 and 72 and the detecting unit 91 is kept as close as possible to a predetermined interval. An electromagnetic coil 92 and a permanent magnet 93 are housed in the synthetic resin housing 10,
The detection unit 91 is magnetically coupled. The detection unit 9
1, the electromagnetic coil 92 and the permanent magnet 93 constitute an electromagnetic induction type rotational speed detector. Further, the detecting section 91 may be provided so as to correspond to one of the outer projection 63 and the inner section 72 of the detected member 6 as shown in FIG. 2, respectively. The shape may correspond to two of 63 and 72 respectively, and if necessary, the shape of the detecting unit 91 may be configured to correspond to the number of each protrusion. The synthetic resin housing 10 of the rotation speed detector 9 is configured as a connector.
The signal from the rotation speed detector 9 can be sent to an anti-lock brake system (not shown) via the line 0. This configuration is known from Japanese Patent Application Laid-Open No. Hei 3-6457.

The axle bearing device having the above structure operates as follows. That is, the detected member 6 is rotated by the inner ring member 2 which is rotated by the rotation of a wheel (not shown). At this time, the protrusion 63 outside the detected member 6
Since the detecting portion 91 of the rotation speed detector 9 is interposed between the inner projection 72 and the inner projection 72, the magnetic flux S flows twice through the outer projection 63 and the inner projection 72 as shown in FIG. Detected, thereby improving the output of detecting the rotational speed.

[0010]

Advantages of the Invention The axle bearing device according to the present invention has a configuration as described in detail above, so that the detection of the rotational speed by the detecting member can be performed simultaneously by the inner and outer projections, thereby reducing the flow of magnetic flux. This increases the detection output.

[0011]

[Brief description of the drawings]

FIG. 1 is an axial sectional view of a main part of an axle bearing device according to an embodiment of the present invention.

FIG. 2 is a sectional view taken along line AA of FIG.

FIG. 3 is another embodiment corresponding to FIG. 2;

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Outer ring member 2 Inner ring member 3 Rolling member 6 Detected member 61 Depressed portion 62 Axial inner peripheral surface 63 Projection 64 Radial inner wall 7 Axial projecting member 71 Outer peripheral surface 72 Projection 8 Cover 9 Rotation speed detector 91 Detector

Claims (1)

(57) [Scope of request for utility model registration] 1. An outer ring member fixed to a vehicle body, an inner ring member mounted on an axle, a rolling member rotatably disposed between inner and outer ring members, and an axial direction mounted on an end of the inner ring member. A detection member having a substantially U-shaped cross-section having a plurality of projections at regular intervals in the circumferential direction on an axially inner peripheral surface of the concave portion formed at the outer end portion; and a cover fixed to the outer ring member and covering the concave portion. And a rotational speed detector fixed to the outer ring member and having a detection portion facing the detected member, the axle bearing device further comprising: a radially inner wall of the concave portion of the detected member; An axially projecting member having an outer peripheral surface opposed to the inner peripheral surface in the axial direction at a predetermined interval in the radial direction is integrally provided, and a plurality of projections at a constant interval in the circumferential direction are formed on the outer peripheral surface of the axially projecting portion, The detection unit of the rotation speed detector is located in the recess. A bearing device for an axle, characterized by being located between a projection on a peripheral surface and a projection on an axial projection with a predetermined radial gap between the projections.