JPH06320902A - Bearing unit for wheel of automobile - Google Patents

Abstract

PURPOSE:To provide an automobile wheel bearing unit whose inside is not exposed even if the pickup sensor section of an engine speed detector is removed in the case of a vehicle maintenance or the like, and is precluded from the possibility of the invasion of a foreign matter or the like. CONSTITUTION:A pulser ring 8 formed with a flange part 8f is fittedly fixed to the end of a rotary wheel, and at the end of a fixed wheel 4, a bracket 12 having a pickup sensor 11 is formed in one body with a core bar 10 on which a flange part 10f is formed, and the pickup sensor 11 is opposed to the pulser ring 8, and an elastic seal 9 having a lip part 9a coming into sliding contact with the inner periphery of the fixed wheel is fastened to the flange part 8f of the pulser ring 8. A face opposite to the pulser ring 8 of the bracket is provided with a recess, and an elastic seal 13 having a lip part 13a coming into sliding contact with the surface of the pulser ring is fittedly attached onto the above face. Thus an automobile wheel bearing unit is formed.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a vehicle wheel bearing unit equipped with a rotation speed detecting device for measuring the rotation speed of an axle on which a vehicle wheel is mounted.

[0002]

2. Description of the Related Art When detecting the speed or rotation speed of an automobile or operating an anti-skid brake system (ABS), a rotation speed detecting device is attached to an axle equipped with wheels to rotate the rotation speed of the axle (wheel). Is detected. Usually, in such a rotation speed detection device, a pulsar ring having concave and convex teeth at regular intervals in the circumferential direction is fitted and fixed at the end of a rotating axle (often also used as an inner ring of a bearing). An electromagnetic pickup sensor mounted on the fixed side (bearing outer ring side) is arranged in the vicinity of the concavo-convex teeth of the pulser ring so as to face it. Further, in recent years, many of the rotation speed detecting devices mounted on the wheel bearing unit are arranged in the bearing seal so that the sensor portion is not exposed (actual flat blade 4-61).
061, No. Sho 59-59769).

[0003]

As described above, in many cases, the detecting portion of the bearing unit for the wheel of the automobile incorporating the rotation speed detecting device is installed inside the seal of the bearing. However, if the pickup sensor is removed during vehicle maintenance of a completed vehicle, there is a risk that the inside of the bearing will be exposed and foreign matter, moisture, etc. will enter and cause various troubles.

The present invention has been made in view of the above problems, and its object is to prevent foreign matters from being exposed inside the bearing even if the pickup sensor portion of the rotation speed detecting device is removed during vehicle maintenance or the like. Another object of the present invention is to provide a bearing unit for an automobile wheel that is free from the risk of intrusion.

[0005]

SUMMARY OF THE INVENTION In order to solve the above-mentioned problems, the present invention provides a rotating wheel to be attached to an axle, a fixed wheel to be attached to a vehicle body, etc., and a seal arranged between the rotating wheel and the fixed wheel. -Wheel of a car consisting of a roll and rolling elements
In a bearing unit for a ring, a pulsar ring having a flange portion is fitted and fixed to an end portion of the rotary wheel, and a core metal having a radial flange portion and a cylindrical portion is picked up at the end portion of the fixed ring. A cylindrical portion of the core metal of a sensor assembly integrally formed with a bracket having a sensor is fitted and fixed, a detected portion of the pulsar ring is opposed to the pickup sensor, and a flange portion of the pulsar ring has the above-mentioned portion. An elastic seal having a lip portion slidably contacting the inner peripheral surface of the fixed ring is fixed, and a concave groove is provided on the surface of the bracket facing the pulsar ring, and the concave groove is slid on the pulsar ring surface. An elastic seal having a contacting lip portion is fitted.

Alternatively, in a bearing unit for a wheel of an automobile, which comprises a rotary wheel to be mounted on an axle, a fixed wheel to be mounted on the vehicle body side, and rolling elements and a seal arranged between the rotary wheel and the fixed wheel, A pulsar ring having a flange portion formed in the radial direction is fitted and fixed to the end portion of the rotary wheel, and a cored bar and a bracket made of a radial flange portion and a cylindrical portion is integrally formed at the end portion of the fixed ring. The cylindrical portion of the cored bar of the molded bracket assembly is fitted and fixed, and the flange portion of the pulser ring is fixed with an elastic seal having a lip portion slidably contacting the inner peripheral surface of the fixed ring. A concave groove is provided on the surface of the bracket facing the pulsar ring, and an elastic seal having a lip portion slidingly contacting the surface of the pulsar ring is fitted in the concave groove, and the pulsar is attached to the bracket.
The present invention is characterized in that a socket type pickup sensor facing the detected portion of the ring is detachably attached.

[0007]

The operation when the bearing unit for a wheel of an automobile is used as the above means will be described with reference to the reference numerals in the attached drawings (FIGS. 1 to 6). A pulsar ring 8 having an L-shaped section in the axial direction and a flange portion 8f formed and fixed to the end of the inner ring 3 which is a rotary wheel, a core metal 10 fitted to the end of the outer ring 4 which is a fixed ring, and a pickup sensor. The bracket 12 and the like on which 11 is mounted form a labyrinth structure between the bearing ring 3b that constitutes a part of the rotating wheel and the outer ring 4 that is the fixed ring, and are substantially as opposed to the bearing portion 1 in which the rolling elements 5 are arranged. This will form a completely sealed structure. Further, a bearing portion 1 including an inner ring 3 which is a rotating wheel and race rings 3a and 3b fitted to the inner ring 3, an outer ring 4 which is a fixed ring, a rolling element 5 and a cage 6.
Is completely sealed by a sealing portion 2 composed of a pulsar ring 8, a core metal 10 and a bracket 12. In addition, even when the bracket 12 constituting the rotation speed detecting device is removed together with the pickup sensor 11 during vehicle maintenance, the sealed structure is still maintained, and there is no risk of foreign matter entering from the outside.

Further, in the socket type pickup sensor 11 ', only the pickup sensor 11' can be detached from the bracket 12 '. Further, even if the pickup sensor 11 'is removed, the bearing portion 1 can maintain the sealed state, so that there is no possibility that foreign matter or the like will enter.

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Specific embodiments of the present invention will be described below with reference to the drawings. FIG. 1 shows an automobile wheel of the present invention.
FIG. 1 is a sectional view in the axial direction of an embodiment of a bearing unit for
3 is an enlarged view of the P portion of FIG. As shown in the figure, this bearing unit comprises a bearing portion 1 and a sealing portion 2 which is a feature of the present invention.

First, the bearing portion 1 is an inner ring 3 which is a rotating wheel formed with a flange portion 3f for fixedly attaching it to a wheel hub or a disk brake, and an outer ring which is a fixed wheel attached to a vehicle body portion such as a suspension. 4, races 3a and 3b fitted to the inner ring 3, rolling elements (balls) 5 and 5, a cage 6 and the like. In this case, the inner ring 3 and the bearing ring 3a,
The inner ring may be integrally formed with 3b. Further, raceways 4a and 4b are formed on the inner peripheral surface of the outer race 4, and a seal 7 is arranged between the raceway 3a on the inner race side and the end 4c of the outer race 4. The inner ring 3 is spline-fitted to an axle (not shown) for rotation.

Next, the sealing portion 2 will be described. A pulsar ring 8 formed of a cylindrical portion 8a and a flange portion 8f extending in the radial direction is fitted and fixed to an end portion of the race ring 3b of the inner ring 3. Therefore, the pulser ring 8 has an L-shaped cross section in the axial direction. An elastic seal 9 provided with lip portions 9a and 9b is fixed to the flange portion 8f of the pulser ring 8, and the cylindrical portion 8a has a constant circumferential direction as shown in a partially developed view of FIG. Holes 8b are provided at intervals. Further, at the end portion (cylindrical portion 4d) of the outer ring 4, a core formed by a cylindrical portion 10a, a flange portion 10f provided radially inward, and a flange portion 10g extending radially outward of the cylindrical portion 10a. The cylindrical portion 10a of the gold 10 is fitted and fixed.
However, the flange portion 10g may be omitted. The lip portions 9a and 9b of the elastic seal 9 fixed to the flange portion 8f of the pulser ring 8 are slid on the inner peripheral surface 4e of the cylindrical portion 4d of the outer ring 4 and the flange portion 10f of the core metal 10, respectively. I have contacted you.

The core metal 1 fitted in the cylindrical portion 4d of the outer ring 4
A synthetic resin bracket 12 having a pickup sensor 11 is integrally formed on the outer surface of the bearing of the cylindrical portion 10a of 0 and the flange portion 10f to form a sensor assembly S. As shown in FIG. 2, the pickup sensor 11 is mounted on the protrusion 12c of the bracket 12 within the angle range indicated by 12a to 12b. Further, the pickup sensor 11 has a detecting portion 11a which is provided in the hole 8 of the pulser ring 8.
The rotation speed is detected by facing b. Further, a concave groove 12d is provided on the inner peripheral surface of the bracket 12, and an elastic seal 13 having a lip portion 13a slidably contacting the surface of the cylindrical portion 8a of the pulsar ring 8 is fitted into the concave groove 12d. Has been done.

If the sealing portion 2 of the wheel bearing unit for an automobile is constructed as described above, as is apparent from the above description, the axial direction fitted and fixed to the end portion of the inner ring 3 which is the rotating wheel is fixed. The bracket 12 of the sensor assembly S, which is fitted to the pulsar ring 8 having an L-shaped cross section and the cylindrical portion 4d at the end of the outer ring 4 which is a fixed ring, forms a labyrinth structure with the bearing ring 3b and forms a rolling element. A substantially complete sealing structure is formed for the bearing portion 1 in which 5 (balls) are arranged.

Further, the bearing portion 1 composed of the inner ring 3 and the race rings 3a and 3b fitted to the inner ring 3, the outer ring 4, the rolling elements 5 and the cage 6 is a pulsar ring 8 and a core metal 10. It is completely sealed by the sealing part 2 which is composed of the bracket 12 and the bracket 12. Moreover, even when the sensor assembly S constituting the rotation speed detecting device is removed during vehicle maintenance, the lip portion 9a of the elastic seal 9 is in sliding contact with the inner peripheral surface 4e of the outer ring 4, so that the pulsar. -The sealing structure between the ring 8 and the outer ring 4 is maintained, and there is no risk of foreign matter entering from the outside.

Next, FIG. 5 is an axial cross-sectional view of another modified embodiment of the vehicle wheel bearing unit of the present invention, and FIG.
FIG. 6 is an enlarged detailed view of an R portion of FIG. In this modified embodiment, a synthetic resin bracket in which a pulsar ring 8, a core metal 10 and a pickup sensor 11 are mounted on a bearing portion 1 including an inner ring 3, inner ring raceways 3a and 3b, an outer ring 4, and rolling elements 5. 12 'is the same as the embodiment shown in FIG. 1 in that the sealed portion 2 is formed. In this modified embodiment, the protrusion 1 of the bracket 12 'on which the pickup sensor 11' is mounted is attached.
2'c is formed in an oblique direction, and the pickup sensor 1
The reference numeral 1'is fitted in an oblique direction and is detachably attached by itself. Further, in this embodiment, a concave groove 12'd is provided on the axially inner peripheral surface outside the detected portion 11'a of the pickup sensor 11 'of the bracket 12', and the pulse groove is formed in the concave groove 12'd. The lip portion 1 is formed on the surface of the cylindrical portion 8a of the ring 8.
An elastic seal 13 with which 3a is slid is fitted.

The bracket 12 'is the bracket 1
A bracket assembly is formed by integrally molding with a core metal 10 formed so as to match a groove 12 'e formed on a surface perpendicular to the axial direction of the bearing part 1 side of 2'. The recessed groove 10h of 10 is fitted and attached to the cylindrical portion 4d of the outer ring 4.

Further, the pickup sensor 11 'is
A main body portion 11'b holding the detection portion 11'a, an elastic ring portion 11'c such as rubber fitted around the end portion of the main body portion 11'b, and a hook to the bracket 12 ' Part 1
1'd, and is a socket type pickup sensor that can be attached and detached independently without removing the bracket 12 'itself. Therefore, in this modification, only the pickup sensor 11 'can be removed from the bracket 12'. Further, even if the pickup sensor 11 'is removed, the bearing portion 1 can still maintain the hermetically sealed state, and there is no possibility that foreign matter will enter.

In each of the above embodiments of the present invention, the inner ring 3 is the rotating wheel and the outer ring 4 is the fixed ring. However, conversely, the invention can be carried out when the outer ring 4 side is the rotating wheel and the inner ring 3 side is the fixed ring. Can be done. That is, the pickup sensor 11 (11 '), which is fitted and fixed to the outer ring 4 side and fixed to the bracket 12 (12'), is attached to the inner ring 3 side and is attached to the sheath.
If the structure of the wheel is reversed, the bearing can be applied to a wheel bearing unit of an outer ring rotating type automobile.

[0019]

Since the bearing unit for a wheel of an automobile of the present invention has the above-described structure, the bearing portion is exposed even when the sensor assembly or the pickup sensor is removed when the completed vehicle is serviced. There is no danger that foreign matter or water will enter. Therefore, replacement of the sensor and maintenance around the bearing unit are facilitated. Further, since the portion where the pulser ring and the pickup sensor are arranged also has the labyrinth structure, it is possible to prevent foreign matter from entering and maintain the accuracy of rotation speed detection.

[Brief description of drawings]

FIG. 1 is an axial cross-sectional view of an embodiment of a vehicle wheel bearing unit of the present invention.

FIG. 2 is a view on arrow Q in FIG.

FIG. 3 is an enlarged detailed view of a P portion of FIG.

FIG. 4 is a partially developed plan view of a pulser ring.

FIG. 5 is an axial sectional view of another modified embodiment of the bearing unit for a wheel of an automobile of the present invention.

6 is an enlarged detail view of an R portion of FIG.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 bearing part 2 sealing part 3 inner ring (rotating ring) 4 outer ring (fixed ring) 8 pulser ring 8a cylindrical part 8f flange part 9 elastic seal 10 core metal 10a cylindrical part 10f flange part 10g flange part 11, 11 'pickup Sensor 12, 12 'Bracket 12d, 1
2'd concave groove 13 elastic seal S sensor assembly

Claims (2)

[Claims] 1. A wheel wheel bearing unit for an automobile, comprising a rotary wheel mounted on an axle, a fixed wheel mounted on the vehicle body side, and rolling elements and a seal arranged between the rotary wheel and the fixed wheel. A pulsar ring having a flange portion formed in a radial direction is fitted and fixed to an end portion of the rotating wheel, and a pickup sensor is attached to an end portion of the fixed wheel on a core metal including a radial flange portion and a cylindrical portion. A cylindrical portion of the core metal of a sensor assembly integrally formed with a bracket having the same is fitted and fixed, a detected portion of the pulsar ring faces the pickup sensor, and the fixed ring is provided on a flange portion of the pulsar ring. An elastic seal having a lip portion slidably contacting the inner peripheral surface of the bracket is fixed, and a groove facing the pulsar ring of the bracket is provided with a groove, and the lip groove slidably contacts the surface of the pulsar ring in the groove. To A bearing unit for an automobile wheel, which is fitted with an elastic seal having the same. 2. A bearing unit for a wheel of an automobile, comprising a rotary wheel mounted on an axle, a fixed wheel mounted on the vehicle body side, and rolling elements and a seal arranged between the rotary wheel and the fixed wheel, A pulsar ring having a flange portion formed in the radial direction is fitted and fixed to the end portion of the rotary wheel, and a cored bar and a bracket made of a radial flange portion and a cylindrical portion is integrally formed at the end portion of the fixed ring. The cylindrical portion of the cored bar of the molded bracket assembly is fitted and fixed, and the flange portion of the pulser ring is fixed with an elastic seal having a lip portion slidably contacting the inner peripheral surface of the fixed ring. An elastic seal having a groove on the surface of the bracket facing the pulsar ring and a lip portion slidingly contacting the groove on the surface of the pulsar ring.
A bearing unit for an automobile wheel, characterized in that a socket type pickup sensor is detachably attached to the bracket, the socket type pickup sensor facing the detected portion of the pulser ring.