JP4063279B2 - Axle bearing device - Google Patents

Description

  The present invention relates to an axle bearing device that detects, for example, the rotational speed of a wheel of an automobile with a detector.

  Conventionally, as an axle bearing device provided with a wheel rotation speed detector, Japanese Patent Application Laid-Open No. 4-4313 is known. This bearing device has an outer member having a mounting portion on the outer peripheral surface on the vehicle body side and a double-row track on the inner peripheral surface, a mounting portion for a wheel on one end portion, and a double-row on the outer peripheral surface. An inner member having a track; a nut for fixing an inner portion forming a part of the inner member; a plurality of rolling members each rotatably disposed between the double row tracks of the inner and outer members; and the inner member A sensor rotor having a detected portion fixed to the other end of the inner member, a cover fixed to the outer member on the other end side of the inner member and covering the inner member and the sensor rotor, and the sensor rotor fixed to the cover A rotational speed detector having a detection end facing the detected portion. The sensor rotor has an L-shaped cross section composed of a cylindrical portion fixed to the outer peripheral surface of the inner member and an annular radial flange having a detected portion formed on the side surface on the cover side, and the rotational speed detector. Is fixed to the cover in the axial direction so that the detection end portion faces the detected portion.

However, in the above conventional axle bearing device, since the assembly tolerances of the sensor rotor, the rotational speed detector, etc. are accumulated in the axial direction, the detected portion of the sensor rotor and the detection end of the rotational speed detector It is necessary to set the gap between them to a certain extent. As a result, the rotational speed detector may be increased in size. In addition, because the nut fixed to the shaft end makes it difficult to arrange the rotation speed detector in the radial direction, the arrangement for detecting the rotation speed in the axial direction is adopted. As a result, it is difficult to downsize the entire bearing device in the axial direction.
Japanese Patent Laid-Open No. 4-4313

  Accordingly, an object of the present invention is to provide an axle bearing device that can be miniaturized in the axial direction.

As means for solving the above-mentioned problems, an outer member having a mounting portion on the vehicle body side on the outer peripheral surface and a double-row track on the inner peripheral surface, and an outer peripheral member having a mounting portion on the wheel at one end portion. An inner member having a double-row track on the surface, a plurality of rolling members rotatably disposed between the double-row tracks of the inner and outer members, and a detected portion fixed to the other end of the inner member A sensor rotor having a cover, a cover fixed to the outer member on the other end side of the inner member and completely covering the inner member and the sensor rotor from outside, and a cover integrally fixed to the inside of the cover. A bearing device for an axle comprising a rotational speed detector having a detection end facing the detected portion of the sensor rotor, wherein the inner member is formed solid and at the center of the end surface on the other end side recess is formed, the Sensaro Periphery but the other end portion of the large diameter tip cylindrical portion and the inner member detected portions are formed on the cylindrical inner peripheral surface with a cylindrical shape protruding to the cover side from the other end side end face of the inner member and a flange portion for connecting the other end portion of the one end portion and the small-diameter cylindrical base of the small-diameter cylindrical base and the large diameter tip cylindrical portion fixed to the surface, and the rotational speed detector is synthesized inside said cover A rotation speed detector molded with resin and fixed integrally; and a single detection end protruding from the synthetic resin mold and facing a part of the sensor rotor in the circumferential direction. The detection end and the rotation speed detection unit are arranged radially inward of the sensor rotor so as to be orthogonal to the detected part of the sensor rotor, and the rotation speed detector includes the cover and the cylinder portion of the sensor rotor. The other end side end of the inner member Housed in enclosed by the space between, the rotational speed detector is disposed along the radial direction in the circumferential direction one place in the space, the rotation detecting unit, the other end portion side end surface of the inner member It is arranged in parallel with the other end portion side end surface of the inner member from the concave portion to the radially outer fixed portion of the sensor rotor, and the detection end portion is arranged at one end in the radial direction of the rotational speed detection portion. It is characterized by being.

  Since the axle bearing device having the above-described configuration has the rotational speed detector arranged in the radial direction inside the sensor rotor, even if the assembly tolerance of the sensor rotor, the rotational speed detector, etc. is accumulated in the axial direction, The gap between the detection unit and the detection end of the rotation speed detector is hardly affected, and the gap can be reduced. Therefore, the rotation speed detector can be reduced in size, and the axial arrangement of the entire bearing device can be reduced in combination with the radial arrangement of the detector.

  In the axle bearing device according to the present invention, the rotational speed detector is arranged in the radial direction inside the sensor rotor, so that even if the assembly tolerance of the sensor rotor, the rotational speed detector, etc. is accumulated in the axial direction, The gap between the detection unit and the detection end of the rotation speed detector is hardly affected, and the gap can be reduced. Therefore, the rotation speed detector can be reduced in size, and the axial arrangement of the entire bearing device can be reduced in combination with the radial arrangement of the detector.

  Specific embodiments of the present invention will be described below with reference to the drawings.

  FIG. 1 is an axial sectional view of an axle bearing device according to an embodiment of the present invention. That is, reference numeral 1 denotes an outer member having a first flange 2 attached to a vehicle body (not shown) on the outer peripheral surface 1a and having double-row tracks 3 and 3 on the inner peripheral surface 1b. Reference numeral 4 denotes an inner member having a second flange 5 attached to a wheel (not shown) at one end portion and having double-row tracks 6 and 6 facing the double-row tracks 3 and 3 on the outer peripheral surface 4a. Reference numeral 7 denotes a rolling member that is held by a cage 8 between the tracks 3 and 3 of the outer member 1 and the tracks 6 and 6 of the inner member 4 and is rotatably arranged.

  The inner member 4 includes a first inner portion 40 and a second inner portion 41. The first inner portion 40 has one of the tracks 6 formed on the outer peripheral surface, a sensor rotor fixing portion 40a at one end, and a solid small-diameter stepped portion 40b extending in parallel with the axis at the other end. Yes. The second inner portion 41 is formed with the other track 6 on the outer peripheral surface and the second flange 5. The second inner portion 41 is press-fitted into the stepped portion 40b of the first inner portion 40 and is stepped by the nut 9 fastened and fixed to the screw portion 40c provided at the tip of the stepped portion 40b. It is fixed to the part 40b. In this way, the inner member 4 is configured by combining the first and second inner portions 40 and 41.

  The fixing member includes not only the nut 9 but also a caulking projection or welding.

  A cylindrical sensor rotor 10 protruding from the end face 40d of the first inner portion 40 is fixed to the sensor rotor fixing portion 40a of the first inner portion 40 of the inner member 4. The sensor rotor 10 is formed of a large-diameter tip cylindrical portion 10a, a small-diameter cylindrical base portion 10b fixed to the sensor rotor fixing portion 40a, and a flange portion 10c that connects both the cylindrical portions 10a and 10b. The large-diameter cylindrical portion 10a is formed with a large number of through-holes having a rectangular cross section at equal cylinder intervals as the detected portion 11. The detected portion 11 may be formed by a large number of teeth, and a conventionally known configuration of the detected portion may be used. The detected portion 11 is formed at least on the inner peripheral surface of the large-diameter cylindrical portion 10a. It only has to be.

  A cover 12 that covers the inner member 4 and the sensor rotor 10 is fixed to the outer member 1. On the outer member 1, a rotational speed detector 13 is arranged and fixed in the radial direction so as to be substantially orthogonal to the detected part 11 inside the sensor rotor 10. This rotational speed detector is molded with synthetic resin and is integrally formed with the cover 12, and only the output terminal protrudes from the cover 12 in the axial direction. Reference numeral 14 denotes a detection end for detecting the rotational speed facing the detected portion 11. Since the nut 9 is located on the opposite side of the inner member 4, the rotational speed detector 13 can be installed in the radial direction close to the inner member 4 without any fear of interference.

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

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Outer member 4 Inner member 7 Rolling member 9 Nut 10 Sensor rotor 11 Detected part 12 Cover 13 Rotational speed detector 40 First inner part 40a Sensor rotor fixing part 40b Stepped part 41 Second inner part

Claims (1)

An outer member having a mounting portion on the vehicle body side on the outer peripheral surface and a double-row track on the inner peripheral surface;
An inner member having an attachment to a wheel at one end and a double-row track on the outer peripheral surface;
A plurality of rolling members that are rotatably arranged between the double-row tracks of the inner and outer members,
A sensor rotor fixed to the other end of the inner member and having a detected portion;
A cover fixed to the outer member on the other end side of the inner member and completely covering the inner member and the sensor rotor so as to shut off from the outside;
A rotational speed detector integrally fixed inside the cover and having a detection end facing the detected portion of the sensor rotor;
An axle bearing device comprising:
The inner member is formed solid, and a recess is formed at the center of the other end surface.
The sensor rotor has a cylindrical shape that protrudes from the end surface on the other end side of the inner member toward the cover side, and a large-diameter tip cylindrical portion in which a detected portion is formed on the inner peripheral surface of the cylindrical portion, and the other end of the inner member A small-diameter cylindrical base fixed to the outer peripheral surface of the part , a flange portion that connects one end of the large-diameter tip cylindrical portion and the other end of the small-diameter cylindrical base,
The rotational speed detector is molded with synthetic resin inside the cover and fixed integrally therewith, and protrudes from the synthetic resin mold to face a part of the sensor rotor in the circumferential direction. Having a single detection end,
The detection end portion and the rotational speed detection portion are arranged radially inside the sensor rotor so as to be orthogonal to the detected portion of the sensor rotor,
The rotational speed detector is housed in a space surrounded by the cover, the cylindrical portion of the sensor rotor, and the other end side end surface of the inner member;
The rotational speed detector is disposed along the radial direction in the circumferential direction one place in the space,
The rotation detection unit is disposed in parallel and close to the other end side end surface of the inner member from the recess on the other end side end surface of the inner member to the fixing portion of the sensor rotor radially outward.
The axle bearing device according to claim 1, wherein the detection end portion is disposed at one end in a radial direction of the rotational speed detection portion.

Images