JPH0750714Y2 - Rolling bearing unit for detecting rotational speed - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial field of application) The rolling bearing unit for detecting rotational speed according to the present invention is
Anti-skid brake system for automobiles (hereinafter,
Just call it "ABS". ) To detect the rotation speed of the wheel during braking and prevent the wheel from locking (when the vehicle is in a running state, the wheel does not rotate) during braking. .

(Prior Art) It has been practiced to detect the rotational speed of a shaft in various mechanical devices. For example, in the case of ABS, it has been conventionally known, for example, in Japanese Examined Patent Publication No. 52-46331. With the rolling bearing unit for detecting the rotational speed as shown in Japanese Patent No. 249069,
It is performed to detect the rotation speed of the wheel during braking.

Among them, the rolling bearing unit for detecting the rotational speed disclosed in Japanese Patent Publication No. 52-46331 is constructed as shown in FIG. Outer tracks 3, 3 are formed on the outer peripheral surface of a hub 1 in which a flange 2 for fixing a wheel is fixed to the outer peripheral surface. Between the inner races 6, 6 formed on the inner peripheral surface of the outer ring 4 supported by the suspension device and the outer races 3, 3 formed on the outer peripheral surface of the hub 1, a plurality of rolling elements 5, 5 are provided. Is mounted so that the hub 1 can freely rotate inside the outer ring 4.

A gear-shaped sensor rotor 7 is fixedly mounted on one end (the right end in FIG. 2) of the hub 1, and a part of a cover 9 fixed to the end of the outer ring 4 faces the sensor rotor 7. A rotational speed detection sensor 8 is provided in a portion to freely detect the rotational speed of the hub 1 to which the sensor rotor 7 is fixed.

In the case of the rolling bearing unit for detecting rotational speed disclosed in Japanese Patent Laid-Open No. 62-249069, the sensor rotor 7 is fixed to the outer peripheral surface of the intermediate portion of the hub 1 as shown in FIG.
The end portion of the rotation speed detection sensor 8 provided through the outer ring 4 is opposed to the outer peripheral edge of the sensor rotor 7.

In these conventionally known rolling bearing units for detecting a rotation speed, as the sensor rotor 7 rotates together with the hub 1, a rotation speed detection sensor 8 provided facing the sensor rotor 7 is provided. The output voltage changes.

As described above, the frequency of the output voltage change of the rotation speed detection sensor 8 accompanying the rotation of the sensor rotor 7 fixed to the hub 1 is proportional to the rotation speed of the hub 1. Therefore,
By inputting the output signal of the rotation speed detection sensor 8 to the controller, the rotation speed of the wheel fixed to the hub 1 can be known.

(Problems to be Solved by the Invention) In the conventional rolling speed detecting rolling bearing unit as described above, the bearing portion and the portion provided with the sensor rotor 7 and the rotation speed detecting sensor 8 are not partitioned. Therefore, the rotation speed detection performance may be affected by the adhesion of grease to the sensor rotor 7 and the rotation speed detection sensor 8.

Further, in the case of the conventional bearing unit, it is troublesome to regulate the preload applied to the bearing within an appropriate range. That is, the outer ring 4
In order to rotatably support the hub 1 on the inner side of the hub 1, it is necessary to apply a preload to the rolling elements 5, 5 provided between the outer raceways 3, 3 and the inner raceways 6, 6. . On the other hand, in the case of the structure of the first example shown in FIG. 2, since the outer raceways 3, 3 are formed directly on the outer peripheral surface of the hub 1, preloading work is very troublesome, In practice, sufficient preload cannot be applied. Further, in the case of the structure of the second example shown in FIG. 3,
The inner ring formed separately from the hub 1 is axially pressed and the preload changes as the nut is tightened after the driving rotary shaft attached to the constant velocity joint is inserted inside the hub 1. . Since the tightening work of the nut to the male screw part formed at the end of the rotary shaft is performed not in the bearing unit assembly factory but in the automobile assembly factory, it is difficult to regulate the tightening torque from the aspect of ensuring proper preload, The preload tends to deviate from the proper value.

The rolling bearing unit for detecting the rotational speed of the present invention eliminates any of the above-mentioned inconveniences.

(Means for Solving the Problem) A rolling bearing unit for detecting a rotation speed of the present invention has a hub having a first outer raceway and a step portion formed on an outer peripheral surface thereof, and a rotation shaft insertable therein. The second outer raceway is formed on the outer peripheral surface, and the inner ring externally supported by the hub with one end surface facing the stepped portion and the first and second inner raceways directly on the inner peripheral surface. The outer ring thus formed, a first seal member that closes an opening at one end of a space existing between the inner peripheral surface of the outer ring and the outer peripheral surface of the hub, and the hub and the inner ring are provided between the outer ring and the outer ring. A plurality of rolling elements, a lock nut that is screwed into a male screw portion formed on the outer peripheral surface of the hub, and presses one end surface against the other end surface of the inner ring, and a part of the outer peripheral surface in the width direction to the stop nut. Circumferential unevenness is formed in the portion near it, and one end surface of the unevenness is brought into contact with the other end surface of the lock nut, The sensor rotor fitted and fixed to the outer peripheral surface of the end of the sleeve, the cover whose one end is fixed to the end of the outer ring, the outer peripheral edge of which is fixed to the other end of the cover, and the inner peripheral edge of which is , The other end opening portion of the space existing between the inner peripheral surface of the outer ring and the outer peripheral surface of the hub by slidingly contacting the remaining portion in the width direction of the outer peripheral surface of the sensor rotor on which the unevenness is not formed A second seal member that closes the inner peripheral surface of the cover, a sensor fixed to the inner peripheral surface of the cover, facing the portion where the unevenness is formed in a part of the outer peripheral surface of the sensor rotor in the width direction, and the inner peripheral surface of the outer ring. The outer peripheral edge portion is fitted in and fixed, and the inner peripheral edge is brought close to the outer peripheral surface of the inner ring, and is configured by a partition plate that partitions the sensor and the portion on which the rolling element is mounted.

(Operation) The operation itself when detecting the rotational speed of the wheel or the like rotatably supported by the rolling bearing by the rolling speed detecting rolling bearing unit of the present invention configured as described above is the same as that of the conventional rotational speed described above. Similar to the speed detecting rolling bearing unit, a sensor fixed to the inner peripheral surface of the cover detects the rotational speed of the sensor rotor fixed to the outer peripheral surface of the end portion of the hub.

Particularly, in the case of the rolling bearing unit for detecting the rotational speed of the present invention, the bearing portion provided with the rolling bearing and the portion provided with the sensor and the sensor rotor are partitioned by the partition plate. Therefore, it is difficult for the grease to reach the portion where the sensor and the sensor rotor are provided, and the adverse effect of the grease on the rotational speed detection performance is eliminated.

Further, since the inner race is formed directly on the inner peripheral surface of the outer ring, compared to the case where a member with a separate inner race is fitted and fixed, the outer race and the rolling bearing for detecting rotational speed incorporating this outer race are mounted. The size and weight of the unit can be reduced. Moreover, since the inner ring having the second outer race is formed separately from the hub, the preload can be easily and reliably applied to the rolling elements.

Further, a preload is applied to the bearing portion by a lock nut incorporated in the bearing portion itself. Therefore, it is not necessary to perform the preload adjustment work again after assembling the bearing unit to the constant velocity joint or the like. The lock nut is not displaced in the axial direction even when another nut screwed with the male screw portion formed at the end of the rotary shaft is tightened for assembly to a constant velocity joint or the like. Therefore, the preload adjusted to an appropriate value at the bearing factory will not deviate from the appropriate value due to the assembly work performed later at the automobile factory. In other words, it is not necessary to regulate the tightening torque of the other nut at the time of assembly in the automobile factory. As a result, it is possible to facilitate the work of assembling the bearing unit and other parts such as the constant velocity joint in the automobile factory.

(Embodiment) FIG. 1 shows an embodiment of the present invention. The first outer raceway 10 is provided on the intermediate outer peripheral surface of the hub 1 provided with the flange 2 for fixing the wheel on the outer peripheral surface at one end (the right end in FIG. 1).
And a step portion 11 are formed. Further, on the outer peripheral surface of the hub 1, an inner ring 16 having a second outer raceway 12 formed on the outer peripheral surface thereof.
However, the one end surface (the right end surface in FIG. 1) is externally fitted and supported by the hub 1 in a state of being opposed to the step portion 11. A female spline groove is formed on the inner peripheral surface of the hub 1 formed in a tubular shape, and a male spline groove formed on the outer peripheral surface of the drive rotary shaft attached to the constant velocity joint is formed on the female spline groove. Engageable.

On the other hand, the outer peripheral surface of the outer ring 4 is provided with a flange 25 for fixing to the suspension device. Also, on the inner peripheral surface of the outer ring 4,
Directly forming first and second inner orbits 13 and 14 respectively facing the first and second outer orbits 10 and 12, respectively.

Further, the outer peripheral edge of the first seal member 24 formed in an annular shape is supported and fixed to the inner peripheral surface of one end portion (the right end portion in FIG. 1) of the outer ring 4, and the first seal member 24 is also fixed. The inner peripheral edge of
It is in sliding contact with the outer peripheral surface of the hub 1. The first sealing material 24 closes one end opening (the right end opening in FIG. 1) of the space 15 existing between the inner peripheral surface of the outer ring 4 and the outer peripheral surface of the hub 1.

Between the first and second outer raceways 10, 12 formed on the outer peripheral surfaces of the hub 1 and the inner ring 16 and the first and second inner raceways 13, 14 formed on the inner peripheral surface of the outer race 4. Each of them has a plurality of rolling elements 5, 5. The hub 1 is rotatably supported inside the outer ring 4 by the rolling elements 5 and 5.

A stop nut is provided on the male screw portion 17 formed on the outer peripheral surface of the hub 1 closer to the other end (left end in FIG. 1) than the step portion 11.
18 is screwed. One end surface of the lock nut 18 (first
The right end surface in the figure) is the other end surface of the inner ring 16 (the left end surface in FIG. 1)
The inner ring 16 is pressed in the axial direction. Then, based on this pressing, the first and second outer tracks 10, 12
A desired preload is applied to the rolling elements 5, 5 provided between the first and second inner raceways 13, 14.

An annular sensor rotor 19 is externally fitted and fixed to the outer peripheral surface of the other end portion (the left end portion in FIG. 1) of the hub 1. Then, one end surface (right end surface in FIG. 1) of the sensor rotor 19 is abutted against the other end surface (left end surface in FIG. 1) of the lock nut 18,
The lock nut 18 is designed to prevent loosening.

A portion of the outer peripheral surface of the sensor rotor 19 in the width direction, which is close to the lock nut 18, is provided with irregularities extending in the circumferential direction. The rotational speed of the sensor rotor 19 can be detected by making a rotational speed detection sensor 20, which will be described later, face the irregularities.

Further, one edge of the cover 21 made of a metal plate (right edge of FIG. 1)
Is externally fitted and fixed to the end portion of the outer ring 4. Further, an outer peripheral edge portion of a second sealing material 22 formed in an annular shape is fixed to the other end portion (left end portion in FIG. 1) of the cover 21. Then, the inner peripheral edge portion of the second seal member 22 is slidably contacted with the remaining portion of the outer peripheral surface of the sensor rotor 19 where the unevenness is not formed. Therefore, the other end opening (the left end opening in FIG. 1) of the space 15 existing between the inner peripheral surface of the outer ring 4 and the outer peripheral surface of the hub 1 is closed by the second sealing material 22. Has been.

Further, the rotation speed detection sensor 20 is fixed to the inner peripheral surface of the intermediate portion of the cover 21. The detection portion of the rotation speed detection sensor 20 is made to face the irregularities formed on the outer peripheral surface of the sensor rotor 19. Further, the outer peripheral edge of a partition plate 23 formed in a circular ring shape is fixed to the inner peripheral surface of the outer ring 4 near the other end (closer to the left end in FIG. 1). By bringing the inner peripheral edge of the partition plate 23 close to the outer peripheral edge of the other end portion of the inner ring 16, the portion provided with the rotation speed detection sensor 20 and the portion provided with the rolling elements 5, 5 are partitioned. There is. With this configuration, it is possible to prevent the rotation speed detection sensor 20 and the sensor rotor 19 from being contaminated by the grease with which the rolling elements 5 and 5 are mounted.

The operation itself when detecting the rotational speed of the wheel or the like rotatably supported by the rolling bearing by the rolling bearing unit for rotational speed detection of the present invention configured as described above is the same as that of the conventional rotational speed detection described above. It is almost the same as the rolling bearing unit. That is, the rotation speed detection sensor 20 fixed to the inner peripheral surface of the cover 21 detects the rotation speed of the sensor rotor 19 fixed to the outer peripheral surface of the end portion of the hub 1.

Particularly, in the case of the rolling bearing unit for detecting the rotation speed of the present invention, the cover 21 having the rotation speed detection sensor 20 fixed to the inner peripheral surface is simply fixed to the other end of the outer ring 4, and the outer circumference of the sensor rotor 19 is fixed. The distance between the surface and the rotation speed detection sensor 20 can be easily and accurately regulated. Moreover, only by fixing the cover 21, the sensor rotor 19 and the rotation speed detection sensor
It is possible to reliably prevent rainwater and dust from entering the part where 20 is provided from the outside.

In addition, the inner ring 16 provided with the second outer raceway 12 is attached to the hub 1 later.
Since it is configured to be externally fitted and supported to the outside, assembling of the hub 1 and the outer ring 4 (compared to the case where a double row outer raceway is directly formed on the hub as in the structure shown in FIG. 2) Can be done easily.

Further, the lock nut 18 incorporated in the bearing unit is adapted to apply an appropriate preload to the rolling bearing.
For this reason, it is not necessary to adjust the preload of the rolling bearing after connecting this bearing unit to the drive rotating shaft attached to the constant velocity joint, and it is easy to assemble the bearing unit and the other parts mentioned above. Becomes That is, when assembling into the constant velocity joint, after inserting the driving rotary shaft attached to the constant velocity joint into the inside of the hub 1, another nut is screwed to the male screw portion formed at the tip of the rotary shaft. Tighten together. When another nut is tightened in this manner, this nut strongly presses the end surface of the hub 1, but even in this case, the lock nut 18 does not displace in the axial direction. Therefore, the preload adjusted to an appropriate value at the bearing factory will not deviate from the appropriate value due to the assembly work performed later at the automobile factory. In other words, it is not necessary to regulate the tightening torque of the other nut at the time of assembly in the automobile factory. As a result, the work of assembling the bearing unit and other parts such as the constant velocity joint in the automobile factory can be facilitated.

(Effect of the Invention) Since the rolling bearing unit for detecting the rotational speed of the present invention is constructed and operates as described above, the work of rotatably assembling the hub inside the outer ring is easy. In addition, it is easy to accurately regulate the distance between the outer peripheral surface of the sensor rotor and the rotation speed detection sensor. In addition, it is possible to improve the reliability of rotation speed detection and facilitate the work of assembling with the constant velocity joint.

[Brief description of drawings]

FIG. 1 is a half sectional view showing an embodiment of the present invention, and FIGS. 2 to 3 are sectional views showing two examples of conventional rolling speed detecting rolling bearing units. 1: hub, 2: flange, 3: outer raceway, 4: outer ring, 5: rolling element,
6: Inner orbit, 7: Sensor rotor, 8: Rotation speed detection sensor,
9: cover, 10: first outer orbit, 11: step, 12: second outer orbit, 13: first inner orbit, 14: second inner orbit, 15:
Space, 16: Inner ring, 17: Male screw part, 18: Lock nut, 19: Sensor rotor, 20: Rotational speed detection sensor, 21: Cover, 22: Second sealing material, 23: Partition plate, 24: First Sealing material, 25:
Flange.

Claims (1)

[Scope of utility model registration request] Claim: What is claimed is: 1. A hub having a first outer raceway and a step portion formed on an outer peripheral surface thereof, a hub into which a rotary shaft can be inserted, and a second outer raceway formed on an outer peripheral surface, and one end surface of the hub is formed. An inner ring externally fitted and supported by the hub in a state of facing the step, an outer ring having first and second inner raceways directly formed on the inner peripheral surface, an inner peripheral surface of the outer ring and the hub. A first seal member that closes one end opening of a space existing between the outer peripheral surface and the outer peripheral surface, a plurality of rolling elements provided between the hub and the inner ring and the outer ring, and a male member formed on the outer peripheral surface of the hub. A lock nut that is screwed into the screw part and has one end surface pressed against the other end surface of the inner ring, and a part of the outer peripheral surface in the width direction is formed with unevenness in the circumferential direction in the portion close to the lock nut. A sensor rotor fitted and fixed to the outer peripheral surface of the end portion of the hub with one end surface in contact with the other end surface of the lock nut and one end edge of the sensor rotor. The cover is fixed to the end of the ring, and the outer peripheral edge is fixed to the other end of the cover, and the inner peripheral edge is not formed with the remaining portion in the width direction of the outer peripheral surface of the sensor rotor. By slidingly contacting the portion, a second sealing material that closes the other end opening of the space existing between the inner peripheral surface of the outer ring and the outer peripheral surface of the hub, and is fixed to the inner peripheral surface of the cover, A sensor facing the portion where the unevenness is formed in the widthwise part of the outer peripheral surface of the sensor rotor,
A rotation speed composed of a partition plate for partitioning the sensor and the portion on which the rolling element is mounted by fixing the outer peripheral edge portion to the inner peripheral surface of the outer ring by fitting the inner peripheral edge close to the outer peripheral surface of the inner ring. Rolling bearing unit for detection.