JPH0527334U - Rolling bearing unit with sensor - Google Patents

Abstract

(57) [Abstract] [Purpose] The joint angle of the constant velocity joint 16 is reduced to increase the degree of freedom in design. [Structure] A cover 20 is fixed to an inner end opening of an outer ring 7.
The sealing material 15 is supported on the inner peripheral edge of the cover 20, and the inner peripheral edge of the sealing material 15 is brought into sliding contact with the outer peripheral surface of the cylindrical portion 28 formed on the outer end portion of the constant velocity joint 16. The constant velocity joint 16 is provided outside as compared with the case where the sealing material 15 is brought into sliding contact with the outer peripheral surface of the inner end portion of the hub 1.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The rolling bearing unit with a sensor according to the present invention is used, for example, to rotatably support an automobile wheel with respect to a suspension device and to detect the rotational speed of the wheel.

[0002]

[Prior Art]

 Conventionally, a vehicle wheel is rotatably supported with respect to a suspension system, and the rotation speed of the wheel is conventionally detected in order to control an anti-lock brake system (ABS) or a traction control system (TCS). For example, there is known a rolling bearing unit with a sensor as described in JP-A-3-39161.

The rolling bearing unit with a sensor described in the above publication is constructed as shown in FIG. A hub 2 is provided with a wheel fixing flange 2 at the outer end (the outer end is the outer end in the width direction when mounted on an automobile, the left end in FIG. 4), and the outer periphery of the middle part. An inner ring raceway 3a is formed on the surface. An inner ring 4 having an inner ring raceway 3b on the outer peripheral surface is externally fitted to the outer peripheral surface of the intermediate portion of the hub 1.

A male screw portion formed on the outer peripheral surface of the inner end portion of the hub 1 (the inner end means a portion that becomes the end portion on the center side in the width direction when mounted on an automobile, the right end portion in FIG. 4). A nut 6 is screwed on the screw 5. The nut 6 is screwed and tightened on the male screw portion 5 to press the inner end surface of the inner ring 4 to fix the inner ring 4 at a predetermined position on the outer peripheral surface of the hub 1.

Further, the outer ring 7 has a mounting portion 9 for supporting a knuckle 8 (see FIG. 1 showing an embodiment of the present invention) of a suspension device on the outer peripheral surface, and a double row outer ring raceways 10a, 10b. Each is formed on the peripheral surface. A plurality of rolling elements 11, 11 are provided between the outer ring raceways 10a, 10b and the inner ring raceways 3a, 3b, respectively, and are provided inside the outer ring 7 supported by the suspension device by the mounting portion 9. The hub 1 is rotatably supported.

A ring-shaped pulse rotor 12 is externally fitted and fixed to a portion of the inner end portion of the hub 1 protruding from the nut 6. A sensor 14 is fixed to a cover 13 fitted and fixed to the inner end opening of the outer ring 7, and the outer end surface of the sensor 14 faces the pulse rotor 12. The inner peripheral edge of the ring-shaped sealing material 15 supported by the inner peripheral edge of the cover 13 is brought into sliding contact with the outer peripheral surface of the inner end portion of the hub 1 to prevent rainwater and dust from entering the inside of the cover 13. I am trying.

In the rolling bearing unit with a sensor as described above, the wheel fixed to the flange 2 provided on the outer end portion of the hub 1 can be rotatably supported by the suspension device supporting the outer ring 7.

When the pulse rotor 12 externally fitted and fixed to the inner end of the hub 1 rotates as the wheels rotate, the output of the sensor 14 facing the pulse rotor 12 changes. The frequency at which the output of the sensor 14 changes is proportional to the rotational speed of the wheel. Therefore, if the output signal of the sensor 14 is input to a controller (not shown), the rotational speed of the wheel can be obtained and ABS and TCS can be properly adjusted. It can be controlled.

[0009]

[Problems to be solved by the device]

 By the way, in the conventional rolling bearing unit with a sensor configured and working as described above, due to the structure for preventing the entry of rainwater and dust into the inside of the cover 13, the following problems will occur. Occurs.

That is, since the inner peripheral edge of the seal material 15 supported on the inner peripheral edge of the cover 13 is brought into sliding contact with the outer peripheral surface of the inner end portion of the hub 1, the length dimension of the hub 1, particularly the inward direction. The amount of protrusion is increased by the width dimension of the portion with which the sealing material 15 is brought into sliding contact. On the other hand, in order to drive the hub 1 to rotate, a constant velocity joint 16 (see FIG. 1 showing an embodiment of the present invention) is provided at the inner end of the drive shaft that is inserted into the hub 1 so as not to rotate. Although it is installed, if the installation position of the constant velocity joint moves toward the inner side due to the increase of the inward protrusion amount of the hub 1, the joint angle (displacement angle) of the constant velocity joint 16 is increased. ) Is inevitable.

An excessively large joint angle of the constant velocity joint 16 is not allowed because it leads to difficulty in smooth transmission of torque. Therefore, increasing the length of the hub 1 reduces the degree of freedom in designing the vehicle, and is not preferable.

The rolling bearing unit with a sensor of the present invention is designed to address the above-mentioned problems.

[0013]

[Means for solving the problem]

 The rolling bearing unit with a sensor of the present invention is similar to the above-described conventional rolling bearing unit with a sensor, and a hub for fixing a wheel to the outer end portion, an inner ring raceway on the outer peripheral surface, and a hub, respectively. It has a drive shaft that is non-rotatably inserted inside the hub and has a constant velocity joint at its inner end, and a mounting portion for supporting the suspension device on the outer peripheral surface, and an outer ring raceway is formed on the inner peripheral surface. The outer ring, a plurality of rolling elements provided between the inner ring raceway and the outer ring raceway, a cover fitted and fixed to the inner end opening end of the outer ring, and a sensor supported by this cover. I have it.

Further, in the rolling bearing unit with a sensor of the present invention, the inner peripheral edge of the annular seal member supported by the cover is brought into sliding contact with a part of the outer peripheral surface of the constant velocity joint. It is characterized by closing the gap between the cover and the constant velocity joint.

[0015]

[Action]

 The rolling bearing unit with a sensor of the present invention configured as described above rotatably supports the wheel with respect to the suspension device, and the action itself when detecting the rotational speed of the wheel fixed to the hub is the same. The same as the conventional rolling bearing unit with a sensor described above.

Further, in the case of the rolling bearing unit with a sensor of the present invention, the inner end portion of the hub is shortened because the inner peripheral edge of the annular seal member supported by the cover is slidably contacted with the outer peripheral surface of the constant velocity joint. I can. Therefore, the joint angle of the constant velocity joint can be made smaller by that amount, and the degree of freedom in design is increased.

[0017]

【Example】

 FIG. 1 shows an embodiment of the present invention. A flange 2 for fixing a wheel is formed on the outer peripheral surface of the outer end portion (the left end portion in FIG. 1) of the hub 1, and a step portion 17 is formed on the outer peripheral surface of the intermediate portion. The outer end surface of the outer inner ring 4a of the inner rings 4a and 4b fitted on the inner half of the hub 1 is butted against the step portion 17. Further, the inner end portion of the inner inner ring 4b is made to slightly project from the inner end surface of the hub 1 and is brought into contact with the outer end surface of the constant velocity joint 16 described later. In the illustrated embodiment, an inner ring raceway is formed on the outer peripheral surface of the hub 1 via the two inner rings 4a and 4b.

A circular ring-shaped pulse rotor 18 is externally fitted and fixed to the outer peripheral surface of the inner end portion of the inner inner ring 4b. The inner surface of the pulse rotor 18 is formed with uneven portions 24 in which unevenness is continuously formed at regular intervals in the circumferential direction.

On the outer peripheral surface of the outer ring 7, a mounting portion 9 for fixing the outer ring 7 to the knuckle 8 of the suspension device is provided. Further, outer ring raceways 10a and 10b are formed on the inner peripheral surface of the outer ring 7 so as to face the inner ring raceways 3a and 3b on the outer peripheral surfaces of the inner rings 4a and 4b, respectively. A plurality of rolling elements 11, 11 are provided between the pair of inner ring raceways 3a, 3b and the pair of outer ring raceways 10a, 10b, respectively, so that the hub 1 can freely rotate inside the outer ring 7. There is.

Further, a seal member 19 is attached between the inner peripheral surface of the outer end portion (left end portion in FIG. 1) of the outer ring 7 and the outer peripheral surface of the outer end portion of the outer inner ring 4 a to attach the outer ring 7 to the outer ring 7. Existing between the inner peripheral surface and the outer peripheral surfaces of the inner rings 4a, 4b, and closing the outer end opening of the space in which the plurality of rolling elements 11, 11 are provided.

On the other hand, the inner end (right end in FIG. 1) opening of the outer ring 7 is closed by a cover 20. The cover 20 is formed into an annular shape so that a part of the constant velocity joint 16 can be inserted therein. The cover 20 is formed into an L-shaped cross section by pressing a metal plate. A sensor 21 for detecting the rotation speed is held inside the cover 20.

The sensor 21 is configured, for example, as shown in FIG. In FIG. 2, 22 is a permanent magnet magnetized in the circumferential direction (vertical direction in FIG. 2), 23a and 23b are pole pieces made of magnetic material, and the ends of both pole pieces 23a and 23b. The portion faces the uneven portion 24 of the pulse rotor 18. A coil 25 is wound around one of the pole pieces 23a having a large length, and an electromotive force induced in the coil 25 can be taken out by a conductive wire 26. Each of the members 22, 23a, 23b, 25 is internally provided in a case 27 made of synthetic resin (inserted when the case 27 is molded).

Further, the inner peripheral edge portion of the cover 20 supports the outer peripheral edge portion of the sealing material 15 formed in an annular shape by an elastic material such as rubber. The inner peripheral edge of the sealing material 15 is brought into sliding contact with the outer peripheral surface of the cylindrical portion 28 formed at the outer end portion of the constant velocity joint 16, whereby the gap between the cover 20 and the constant velocity joint 16 is made. 29 is blocked, and rainwater and dust are prevented from entering the space 30 in which the sensor 21 and the pulse rotor 18 are installed through the gap 29.

In the illustrated embodiment, the labyrinth seal portion is provided between the outer peripheral edge and the inner peripheral surface of the pulse rotor 18 by bringing the outer peripheral edge of the pulse rotor 18 close to the inner peripheral surface of the cover 20. There is. Therefore, the grease existing in the rolling element 11, 11 installation portion is prevented from entering the uneven portion 24 and the sensor 21 portion on the outer surface of the pulse rotor 18, and the rotation speed of the hub 1 can be detected by this grease. You can prevent uncertainty.

The rolling bearing unit with a sensor of the present invention configured as described above rotatably supports the wheel with respect to the suspension device and detects the rotational speed of the wheel fixed to the flange 2 of the hub 1. The action itself at this time is almost the same as that of the conventional rolling bearing unit with a sensor described above.

That is, as the wheel rotates, the outer peripheral surface of the hub 1 is externally fitted and fixed to the inner end portion of the inner ring 4 b. When the pulse rotor 18 rotates, the sensor facing the uneven portion 24 on the inner surface of the pulse rotor 18 is provided. The output of 21 changes. Since the frequency at which the output of the sensor 21 changes is proportional to the rotation speed of the wheel, if the output signal of the sensor 21 is input to a controller (not shown), the rotation speed of the wheel is obtained and the ABS and TCS are controlled appropriately. I can.

Further, in the case of the rolling bearing unit with a sensor of the present invention, the inner peripheral edge of the annular sealing material 15 supported by the fixed cover 20 at the inner end opening of the outer ring 7 is connected to the outer end of the constant velocity joint 16. The inner end portion of the hub 1 comes out short by the amount of sliding contact with the outer peripheral surface of the cylindrical portion 28 of the portion, and the constant velocity joint 16 can be positioned on the outer side (left side in FIG. 1). Therefore, the joint angle of the constant velocity joint 16 can be reduced by that amount, and the degree of freedom in design is increased.

Next, FIG. 3 shows a second embodiment of the present invention. In the case of this embodiment, not only is the inner peripheral edge of the sealing material 15 supported on the inner peripheral edge of the cover 20 slidably contacted with the outer peripheral surface of the cylindrical portion 28 at the inner end of the constant velocity joint 16, but The inner peripheral edge of the lip piece 31 protruding from the side surface is brought into sliding contact with the outer peripheral surface of the constant velocity joint 16. As a result, in the case of this embodiment, the sealability of the gap 29 can be maintained at a high level.

[0029]

EFFECTS OF THE INVENTION Since the rolling bearing unit with a sensor of the present invention is constructed and operates as described above, the joint angle of the constant velocity joint can be made small and the degree of freedom in design is increased.

[Brief description of drawings]

FIG. 1 is a half sectional view showing a first embodiment of the present invention.

FIG. 2 is a plan view showing an example of a cover incorporating a sensor.

FIG. 3 is a cross-sectional view showing a second embodiment of the present invention, which corresponds to the portion A in FIG.

FIG. 4 is a sectional view showing a conventional example.

[Explanation of sign]

 1 hub 2 flange 3a inner ring raceway 3b inner ring raceway 4 inner ring 4a inner ring 4b inner ring 5 male screw part 6 nut 7 outer ring 8 knuckle 9 mounting part 10a outer ring raceway 10b outer ring raceway 11 rolling element 12 pulse rotor 13 cover 14 sensor 15 seal High speed joint 17 Step portion 18 Pulse rotor 19 Sealing material 20 Cover 21 Sensor 22 Permanent magnet 23a Pole piece 23b Pole piece 24 Concavo-convex portion 25 Coil 26 Conductive wire 27 Case 28 Cylindrical portion 29 Gap 30 Space 31 Lip piece

Claims (1)

[Scope of utility model registration request] 1. A hub having a wheel fixing flange on an outer end and an inner ring raceway on an outer peripheral surface, and a non-rotatably inserted inside the hub, and a constant velocity joint provided on an inner end of the hub. And a plurality of rolling elements provided between the inner ring raceway and the outer ring raceway. In a rolling bearing unit with a sensor including a cover fitted and fixed to the inner end opening end of the outer ring, and a sensor supported by the cover, an annular seal member supported by the cover is provided. A rolling bearing unit with a sensor characterized in that a gap between the cover and the constant velocity joint is closed by sliding an inner peripheral edge of a part of the constant velocity joint on an outer peripheral surface of the constant velocity joint.