JPH1048230A - Bearing assembly - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain a bearing assembly in which hermetic sealing performance is enhanced while reducing the cost by bonding a resilient body arranged with S and N poles, at a constant circumferential interval, on the outer end face at the flange part of a core metal on the side being fitted to an inner ring. SOLUTION: A magnetized ring rubber 14 is bonded to the outer surface of the core 8b of a stinger 8. The magnetized ring rubber 14 is arranged alternately with S and N poles at a constant interval in the circumferential direction. A fixing metal 15 fixed with a pickup sensor 16 if fitted, at the tubular part 15a thereof, to the inner circumferential surface 2c of an outer ring 2. This sensor 16 is disposed oppositely to the magnetized rubber 14 while being spaced apart slightly. When the inner ring 2 turns, the S and N poles of the magnetized rubber 14 are varied alternately at a rate proportional to the r.p.m. of an axle fitted with a wheel. Rotational speed of the axle can be detected accurately by capturing the speed variation by means of the sensor 16.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an axle assembly for measuring the rotation speed of an axle on which wheels of an automobile or the like are mounted.
In particular, the present invention relates to a bearing assembly that facilitates processing and assembly.

[0002]

2. Description of the Related Art In recent years, in many cases, an antilock brake system (ABS) has been employed as a means for preventing a wheel from locking during braking in an automobile braking device. In this ABS, an electromagnetic valve controlled by a computer is provided in the middle of a hydraulic path, and the hydraulic pressure is turned on and off by opening and closing the valve. At the time of control, the rotation speed (rotation speed) of an axle on which wheels are mounted is controlled. Measured.

A known axle bearing assembly for measuring the rotational speed of an axle is provided with a flange portion 1a for fixing to a wheel (not shown) as shown in FIG. Hole 1 for fitting and fixing (not shown)
b, an outer ring 2 fixed to the vehicle body (not shown), balls (rolling elements) 3, 3 disposed between the inner ring 1 and the outer ring 2, and a cage 4 for holding these balls. 4 and
Seal member 5 and rotation speed detecting unit 20 having a sealing function
And is composed of

FIG. 5 is an enlarged view of a portion Q in FIG. 4 showing the details of the rotation speed detecting section 20, and FIG. 6 is a view taken in the direction of arrow B in FIG. That is, the rotation speed detecting section 20 press-fits and fixes one core 21a having an L-shaped cross section to the outer peripheral surface of the separate annular member 7 fitted and fixed to the inner ring 1 and fixes the other core (flange). A slinger 21 having a large number of slits 21c formed in the circumferential direction of the flange 21b;
It comprises a seal member 25 composed of a rubber seal 24 having seal lips 24a, 24b, 24c formed around 3a, and a pickup sensor 26. There are various types of bearing assembly structures for measuring the rotational speeds of many axles. Basically, the slinger provided with the slits 21c and the concave and convex portions on the rotating body that rotates the inner ring or the outer ring as described above. Pickup sensor 2 for pulser ring like 21
6 are arranged.

[0005]

As described above, the bearing assembly of the axle has a space 1 formed between the inner ring 1 and the outer ring 2.
Since the balls (rolling elements) 3 and 3 are arranged at 0, the internal space 10 is sealed by arranging a rotation speed detecting unit 20 which also serves as a seal with the seal member 5 at both ends. . And FIG.
As shown in FIG. 6 and FIG. 6, in the slinger 21 constituting the rotation speed detecting unit 20, one L-shaped core 21a is fitted and fixed to the outer peripheral surface 7b of the annular member 7, and the other core (flange). A slit 21c is formed in 21b. Seal lips 24a, 24 of a seal member 25 fitted and fixed to the inner peripheral surface of the outer ring 2 on one core metal 21a of the slinger 21.
b is in sliding contact. However, said slinger 2
Since a large number of slits 21c are formed on the surface of the other cored bar (flange portion) 21b, the seal of the rubber seal 24 is formed.
The lulip 24c cannot be brought into sliding contact. For this reason, there is a problem that the sealing is not sufficient, and muddy water or dust penetrates and adversely affects the life of the bearing. Further, there is a problem that the processing operation for forming the slit 21c in the slinger 21 requires accuracy and the processing is complicated.

SUMMARY OF THE INVENTION The present invention has been made in view of the above-mentioned problems, and can improve the sealing performance by allowing the side lip to make sliding contact, and eliminate the need for slitting the slinger and reduce the cost. It is intended to provide a bearing assembly.

[0007]

SUMMARY OF THE INVENTION In order to solve the above-mentioned problems, the present invention provides a metal core having a flange at the end of the inner surface of the outer ring and a flange at the end of the outer surface of the inner ring. And a bearing assembly having a seal portion on at least one of the core bars, an S pole and an N pole are circumferentially formed on the outer end surface of the flange portion of the core bar on the side fitted with the inner ring. An elastic body magnetized so as to be evenly distributed is bonded.

[0008]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, specific embodiments of the present invention will be described with reference to the drawings. FIG. 1 is a partial sectional view of a bearing assembly according to the present invention. The same components are denoted by the same reference numerals as those described in the related art. This bearing assembly includes an inner ring 1, an outer ring 2, balls (rolling elements) 3, 3 disposed between the inner ring 1 and the outer ring 2, cages 4, 4 for holding these balls, And a rotation speed detector 6.

A flange 1a is formed on the outer periphery of the inner race 1 for fixing the inner race 1 to a wheel (not shown). Also,
A hole 1b provided with a spline is formed in the inner diameter of the inner ring 1, and an axle (not shown) is fitted therein. A raceway surface 1c is formed on the outer peripheral surface of the inner ring 1, and an annular member 7 having the same function as the inner ring is separately fitted and fixed to the inner ring 1. A track surface 7a is also formed on the surface of the annular member 7. The outer ring 2 is fixed to a vehicle body (not shown) of the automobile, and has track surfaces 2a and 2b formed on an inner peripheral surface. Both ends of the annular space 10 between the inner ring 1 and the outer ring 2 are hermetically sealed by a seal member 5 and a rotation speed detecting unit 6 described later.

FIG. 2 is an enlarged view of a portion P in FIG. 1, and FIG. 3 is a view taken in the direction of arrow A in FIG. One core metal 8a of an L-shaped slinger 8 is press-fitted and fixed to the annular member 7, and the inner peripheral surface 2 of the outer ring 2 is fixed.
A seal member 13 in which a rubber seal 12 is baked around an L-shaped core metal 11 is fitted and fixed to c. The seal lips 12a and 12b provided on the rubber seal around the core metal flange portion 11a of the seal member 13 are formed by the annular member 7.
The sliding member 8 is in sliding contact with the surface of one of the cores 8a of the slinger 8 which is press-fitted and fixed to the outer peripheral surface 7b of the slinger 8. Further, the side lip 12c provided on the seal member 13 has the other core (flange portion) of the slinger 8. 8b is in sliding contact. Thus, the sealing member 13 can be brought into sliding contact with the surface of the slinger 8 in a triple manner to complete the sealing.

Next, a ring-shaped magnetized rubber 14 is adhered to the outer surface of the other cored bar (flange portion) 8b of the slinger 8. This magnetized rubber 14 is, as shown in FIG.
It is a ring-shaped one in which the S and N poles are alternately magnetized in the circumferential direction so as to be circumferentially equally distributed. This magnetized rubber 14 is
A large amount of magnetic iron oxide is added to the raw material powder of the synthetic rubber, mixed well, then hardened, and the magnetic material is produced by alternately magnetizing the S pole and the N pole.

On the inner peripheral surface 2c of the outer race 2, a cylindrical portion 15 of a mounting bracket 15 to which a pickup sensor 16 is mounted is provided.
a is fitted and fixed. The pickup sensor 16 is arranged to face the magnetized rubber 14 adhered to the surface of the other cored bar 8b of the slinger 8 at a slight distance. That is, when the inner ring 2 rotates, the S-pole and the N-pole of the magnetized rubber 14 change alternately, and the speed of this change is proportional to the rotation speed of the axle on which wheels (not shown) are mounted. Therefore, if the change speed is detected by the pick amplifier sensor 16, the rotation speed of the axle can be accurately detected.

As described above, in this bearing assembly, the slinger 8 of the rotation speed detector 6 is provided with
It is not necessary to form c (see FIGS. 5 and 6). Further, since there is no slit 21c, the side lip 12c of the seal member 13 can be brought into sliding contact with the surface of the core metal (flange portion) 8b of the slinger 8 on the surface of the other core metal 8b of the slinger 8. Accordingly, since the sealing structure can be completed by that amount, muddy water, dust and the like hardly enter, and the life of the bearing can be extended.

The magnetized comb 14 only adheres to the surface of the other cored bar 8b of the slinger 8, and there is no need to form the slits 21c at equal intervals in the circumferential direction. Normally, the slit 21c is formed in such a slinger 8 by pressing, but in order to accurately detect the number of rotations, the interval between the slits 21c must be as accurate as possible. For that purpose, it is necessary to improve the manufacturing accuracy of the mold and the like, and the manufacturing cost is inevitably increased. However, the magnetized rubber 14 can easily magnetize the S pole and the N pole accurately and the manufacturing cost is low.

In the above embodiment, the slinger 8 having the magnetized rubber 14 adhered thereto is press-fitted and fixed to the inner ring 1 side, and the seal member 13 is press-fitted to the inner peripheral surface of the outer ring 2 so that the seal portion is formed. Although the rotation speed detection unit 6 provided is provided, a slinger to which the magnetized rubber 14 is adhered may be press-fitted to the outer ring 2 side, and the seal member may be press-fitted and fixed to the inner ring 1 side. Alternatively, a core metal may be fitted to the outer ring 2 side, and a rubber seal provided with a seal lip may be baked to the slinger 8 side.

[0016]

As described above in detail, according to the bearing assembly of the present invention, it is possible to prevent the intrusion of muddy water, dust and the like by almost completely sealing the rotation speed detecting portion. Further, the slinger does not need to be formed with slits or irregularities unlike the conventional pulsar ring, and can be manufactured at low cost because the manufacturing such as the work of bonding the magnetized rubber is easy.

[Brief description of the drawings]

FIG. 1 is a partial sectional view of a bearing assembly according to the present invention.

FIG. 2 is an enlarged view of a part P in FIG.

FIG. 3 is a partial front view of a slinger of the bearing assembly according to the present invention, as viewed in the direction of arrow A in FIG. 2;

FIG. 4 is a partial cross-sectional view of a conventional bearing assembly.

FIG. 5 is an enlarged view of a portion Q in FIG. 4;

FIG. 6 is a partial front view of a slinger of the conventional bearing assembly, as viewed from an arrow B in FIG. 5;

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Inner ring 2 Outer ring 3 Ball (rolling body) 4 Cage 5 Seal member 6 Revolution detection part 7 Annular member 8 Slinger 11 Core metal 12 Rubber seal 13 Seal member 14 Magnetized rubber 15 Mounting bracket 16 Pickup sensor

Claims (1)

[Claims] 1. A core having a flange at an end of an inner ring of an outer ring, a core having a flange at an end of an outer diameter of an inner ring, and at least one of the cores has a seal. In a bearing assembly, an elastic body magnetized so that an S pole and an N pole are circumferentially equidistant is bonded to an outer end surface of a flange portion of a core metal to be fitted to an inner ring. Assembly.