JP2000097959A - Rolling bearing unit with rotational speed detecting device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To realize a structure which can be miniaturized, whose accuracy can be made high and which can obtain a large output. SOLUTION: A pair of rotation-side comb teeth-shaped end edge parts 38a, 38b are made at a ring-shaped tone wheel 33 which is fixed to the end part of a turning inner ring 6 and whose cross section is L-shaped. An uneven part 48 is formed on the end face of a permanent magnet 39 constituting a sensor 34 and a standstill-side comb teeth-shaped end edge part 47 is formed at a stator 40 in such a way that their pitch is equal to that of the rotation-side comb teeth-shaped end edge parts 38a, 38b. When the inner ring 6 is turned, the flow of a magnetic flux is changed in two places and over the whole circumference.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION A rolling bearing unit with a rotation speed detecting device according to the present invention is incorporated in an anti-lock brake system (ABS) or a traction control system (TCS) to detect a rotation speed of a wheel of an automobile. Use it for

[0002]

2. Description of the Related Art In order to control an anti-lock brake system (ABS) or a traction control system (TCS) of a vehicle, it is necessary to detect a rotational speed of a wheel. Various types of rolling bearing units with a rotation speed detection device for detecting the rotation speed using changes in magnetic flux have been known for this purpose. A structure for increasing the change in the magnetic flux by making the change in the magnetic flux at two locations and improving the reliability of the rotation speed detection is also disclosed in, for example, JP-A-7-253.
Nos. 438, 8-211081, 9-28
As described in JP-A Nos. 2117, 10-90292, and US Pat. No. 5,2006,977, various types are conventionally known.

However, in the case of the inventions described in the above publications, it is desired to improve the following points. First, JP-A-9-288117 and 10-9029
No. 2,2006, US Pat. No. 5,2006,977 uses a so-called multi-pole magnet in which S and N poles are alternately arranged in the circumferential direction as a tone wheel. I have. Therefore, the production of the tone wheel is troublesome and costly. Also, in order to improve the accuracy of rotation speed detection, it is necessary to increase the number of S poles and N poles arranged in the circumferential direction. There is a limit in improving the accuracy of rotation speed detection.

Further, in the case of the structure described in Japanese Patent Application Laid-Open No. 7-253438, since the sensor is a so-called piece which only faces a part of the circumferential direction of the tone wheel, the inside of the sensor is The amount of flowing magnetic flux, that is, the variation of the magnetic flux is small, and the effect of improving the reliability of detecting the rotational speed is low. Furthermore, in the case of the structure described in Japanese Patent Application Laid-Open No. Hei 8-211081, a portion for changing the magnetic flux is provided at two positions separated only in the axial direction of the rolling bearing unit. The axial dimension of the device increases. Because of this,
In some cases, it is difficult to incorporate the bearing into a small rolling bearing unit. In view of such circumstances, the present invention provides a rolling bearing unit with a rotation speed detection device that can be reduced in size and increased in accuracy and can increase the output of a sensor in order to improve the reliability of rotation speed detection. It was invented.

[0005]

A rolling bearing unit with a rotation speed detecting device according to the present invention is provided with a rotating wheel and a rolling wheel, similarly to a conventionally known rolling bearing unit with a rotation speed detecting device.
The vehicle includes a stationary wheel, a plurality of rolling elements, a tone wheel, and an annular sensor. The rotating wheel has a rotating-side orbit on the rotating-side peripheral surface, and rotates during use. Further, the stationary wheel has a stationary-side orbit on a stationary-side peripheral surface facing the rotating-side peripheral surface, and does not rotate during use. In addition, the plurality of rolling elements are rotatably provided between the rotating-side track and the stationary-side track to allow rotation of the rotating wheel with respect to the stationary wheel. Further, the tone wheel is made of a magnetic material, and includes a cylindrical portion, a circular portion bent in a diametrical direction from one axial end edge of the cylindrical portion, and a continuous portion that connects the cylindrical portion and the circular portion. Prepare. By providing a plurality of protrusions and notches alternately in the circumferential direction and at a constant pitch in a portion of the cylindrical portion and the ring portion separated from the continuous portion, the portions on the rotation side are respectively provided. A comb-like edge is formed. Further, the sensor includes an annular permanent magnet that is arranged concentrically with the rotating wheel and the tone wheel and that is magnetized in one direction over the entire circumference, and one end surface of the permanent magnet in the magnetizing direction. And a ring-shaped stator made of magnetic material combined in series with the magnetization direction of the permanent magnet, and a voltage corresponding to a change in magnetic flux flowing through the stator attached to the stator. And an annular coil that causes By providing a plurality of protrusions and notches alternately and at equal pitch in the circumferential direction at a part of the stator, at the end opposite to the continuous part with the permanent magnet, at the end of the stator. A stationary comb-shaped edge having the same pitch as the rotating comb-shaped edge is formed, and both the rotating-side and stationary-side comb-shaped edges are formed on the other end surface in the magnetizing direction of the permanent magnet. A gear-shaped uneven portion is formed at a pitch. Then, at the moment when the plurality of protrusions forming the uneven portion face the plurality of protrusions forming any one of the rotation-side comb tooth-shaped edge portions, the plurality of the plurality of protrusions forming the stationary-side comb tooth-shaped edge portion are formed. The concavo-convex portion, the pair of rotating comb-shaped edges, and the stationary comb-shaped edges are arranged such that the protruding portion faces a plurality of protruding portions forming another rotating comb-shaped edge. Regulates the phase with the part.

[0006]

In the case of the rolling bearing unit with the rotation speed detecting device of the present invention configured as described above, when the tone wheel rotates together with the rotating wheel, the convex portion of the uneven portion of the permanent magnet constituting the sensor and the stationary side comb of the stator. The protruding part of the toothed edge is
The protrusions and the notches of the pair of rotating comb-shaped end portions provided on the tone wheel alternately face each other. Then, at the moment when the plurality of protrusions and protrusions face the protrusions of the respective rotating comb teeth, the amount of magnetic flux flowing in the stator increases, and conversely, the moment when the protrusion faces the notch. Less. Such a change in the magnetic flux is performed simultaneously and over the entire circumference at the two locations of the uneven portion and the stationary comb-like edge. Therefore, the change in the amount of magnetic flux flowing in the stator increases, and the voltage induced in the coil attached to the stator increases.

[0007]

FIG. 1 shows a first embodiment of the present invention.
An example is shown. In the example shown in the drawings, the present invention is applied to a rolling bearing unit for supporting drive wheels (front wheels of FF vehicles, rear wheels of FR and RR vehicles, all wheels of 4WD vehicles) on an independent suspension type suspension. Is shown. However,
The present invention is not limited to such a case, and the present invention is applied to a rolling bearing unit for supporting a driving wheel on a non-independent suspension type suspension, and further for a driven wheel (a rear wheel of an FF vehicle, a front wheel of an FR vehicle and an RR vehicle). Needless to say, the present invention can also be applied to the rolling bearing unit.

In the illustrated example, an outer ring 1 which is a stationary wheel which is not rotated while being supported by a suspension device has a mounting portion 2 for supporting the suspension device on an outer peripheral surface thereof and an inner peripheral portion which is a stationary side peripheral surface. On the surface, a double row outer ring track 3, each of which is a stationary side track,
3 respectively. A hub 4, which is a rotating wheel, is arranged concentrically with the outer ring 1 on the inner diameter side of the outer ring 1.
On the outer circumferential surface of the hub 4 which is the rotating side circumferential surface, the inner ring raceways 5 and 5 which are the rotating side raceways are directly or via the separate inner ring 6 on the portions facing the outer ring raceways 3 and 3 respectively. Provided. The inner ring 6 is fitted to a small-diameter stepped portion 7 formed at the inner end of the main body portion of the hub 4 (an end near the center in the width direction of the vehicle when assembled to the vehicle, the right end in FIG. 1). At the same time, a portion protruding from the inner end face of the inner ring 6 at the inner end of the main body portion is fixed to the main body portion by a caulking portion 8 formed by caulking and spreading outward in the diametrical direction.

A plurality of rolling elements 9, 9 are provided between the outer raceways 3, 3 and the inner raceways 5, 5 so as to freely roll, so that the inner race side of the outer race 1 is provided. The hub 4 is rotatably supported. Seal rings 10 and 10 are provided between the inner peripheral surfaces of both ends of the outer ring 1, the outer peripheral surface of the intermediate portion of the main body of the hub 4, and the outer peripheral surface of the inner end of the inner ring 6, respectively. Moving body 9,
9 and the outside space. An outer end of the hub 4 (an end which is located outward in the width direction of the vehicle when assembled to the vehicle, and a left end in FIG. 1) is mounted on an outer peripheral surface of the hub 4 for supporting and fixing wheels to the hub 4. Flange 11
Are provided integrally with the hub 4.

A spline hole 12 is provided in the center of the hub 4. Further, the hub 4 and the drive shaft member 13 are combined to form a rolling bearing unit for a wheel. A spline shaft 14 that engages with the spline hole 12 is provided at an outer end, which is one end of the drive shaft member 13. Further, an inner end of the drive shaft member 13 is a housing portion 15 which becomes an outer ring of the constant velocity joint. A locking groove 1 for locking an outer end of a dustproof boot (not shown) is formed on an outer peripheral surface of an inner end of the housing portion 15.
6 are formed. Further, an inner engaging portion such as an inner engaging groove 17 is formed on the outer peripheral surface of the spline shaft 14 near the outer end over the entire circumference. The step 1 is located at a position where the outer edge of the spline hole 12 is aligned with the inner engaging groove 17.
8 and the like. Such a step 18
Is to make the inner diameter of a portion of the inner peripheral surface of the hub 4 adjacent to the spline hole 12 larger than the diameter of the inscribed circle of the spline hole 12 so that the outer edge of the spline hole 12 Formed over the entire circumference. A ring-shaped retaining ring 19 is mounted on the inner engaging groove 17 and the step 18 so as to extend over the inner engaging groove 17 and the step 18. This prevents the spline shaft 14 from coming out of the spline hole 12. When the retaining ring 19 is mounted in the inner engaging groove 17 and the outer diameter of the retaining ring 19 is elastically reduced, the outer diameter of the retaining ring 19 is inscribed in the spline hole 12. It is set to be less than the diameter of the circle. Therefore, if the spline shaft 14 is pushed into the spline hole 12 with the retaining ring 19 mounted in the inner engagement groove 17,
The spline shaft 14 and the hub 4 can be easily connected. The outer engaging portion provided on the hub 4 side is the step portion 1.
In addition to 8, an outer diameter side engaging groove formed over the entire periphery in the intermediate portion of the spline hole 12 may be used.

The end face of the caulking portion 8 and the inner race 6
Between the inner end surface of the housing portion and the outer end surface of the housing portion 15.
The seal member 20 is sandwiched. This sealing member 20
Is composed of a metal core 21 and an elastic material 22. The core metal 21 is made of a plate material made of spring steel, and has a substantially L-shaped cross section and is formed in an annular shape as a whole. In such a cored bar 21, the cylindrical portion 23 provided on the outer diameter side portion is externally fitted and fixed to the outer end of the housing portion 15 and bent inward in the diameter direction from the outer end edge of the cylindrical portion 23. The annular portion 24 is supported and fixed to the outer end of the housing portion 15 in a state where the annular portion 24 abuts against the outer end surface of the housing portion 15. Moreover, the above-mentioned ring part 2
By providing an inclined portion 25 that is inclined outward in the axial direction toward the inner diameter side in a portion that is continuous from the inner peripheral edge of 4, an inner diameter side portion of the circular ring portion 24 is formed as a diaphragm-shaped disc spring portion 26. . The outer surface of the disc spring portion 26 is elastically abutted against the end surface of the caulked portion 8 via a part of an elastic member 22 described below attached to the outer surface.

Thus, the spline shaft 14 is prevented from being displaced to the left with respect to the spline hole 12 from the state shown in FIG. Further, the spline shaft 14 and the spline hole 12 are prevented from rattling in the axial direction, and the engagement portion between the spline shaft 14 and the spline hole 12 is prevented from being worn.

The elastic member 22 is formed in an annular shape entirely from an elastomer such as rubber, and is adhered or bonded to the outer surfaces of the annular portion 24 and the disc spring portion 26 constituting the cored bar 21. It is fixed by baking or the like.
A seal lip 27 is provided on the outer surface of the elastic member 22 at the outer end in the diametrical direction, and the leading edge of the seal lip 27 is brought into elastic contact with the inner end surface of the inner ring 6 over the entire circumference. ing. Thus, a portion between the inner end surface of the inner ring 6 and the outer end surface of the housing portion 15, that is, the inner end opening of the space where the engagement portion between the spline shaft 14 and the spline hole 12 exists is sealed. . In the illustrated example, the inner end opening of the space is sealed by the elastic member 22 sandwiched between the end surface of the caulking portion 8 and the outer surface of the disc spring portion 26 described above.
It is also planned by some of them.

A cover 28 is fitted and fixed to a portion of the hub 4 near the outer end of the intermediate portion. This lid 28 is
A cylindrical fitting / fixing portion 29 formed of a steel plate such as PCC or the like and having a cylindrical shape, a closing plate portion 30 provided to close the inner end opening of the fitting / fixing portion 29, Outward flange-shaped flange portion 3 provided on the outer edge of mating fixing portion 29
And 1. Then, the fitting and fixing portion 29 is internally fitted and fixed to the portion near the outer end of the hub 4 by interference fit, and the flange portion 31 is connected to the fitting and fixing portion 29 on the inner peripheral surface of the hub 4. It abuts against a step 32 formed at a portion adjacent to the portion fitted inside. Further, in this state, the closing plate 30 closes the distal end face of the spline shaft 14 in a state where the closing plate 30 closes the outer end opening of the space where the engagement portion between the spline shaft 14 and the spline hole 12 exists. opposite.

Of the tone wheel 33 and the sensor 34 constituting the rotation speed detecting device which is a feature of the present invention, the tone wheel 33 is provided at the inner end of the inner ring 6 constituting the above-mentioned rolling bearing unit for a wheel. , The sensor 34 is the outer ring 1
Are externally fitted and fixed to the inner ends of the respective members by interference fit. By making the tone wheel 33 and the sensor 34 close to and opposed over the entire circumference, a rotation speed detecting device for detecting the rotation speed of the wheel supported and fixed to the hub 4 is configured.

The tone wheel 33 is formed in an annular shape with a L-shaped cross section from a magnetic metal plate such as a mild steel plate such as SPCC. That is, the tone wheel 33
A cylindrical portion 35, a circular ring portion 36 bent at a right angle from the axially inner end edge of the cylindrical portion 35 outward in the diametric direction,
A continuous portion 3 that connects the cylindrical portion 35 and the ring portion 36
7 is provided. The cylindrical portion 35 and the ring portion 3
6, a part separated from the continuous part 37, that is, an inner half part (the right half part in FIGS. 1 and 2) of the cylindrical part 35 and an intermediate part to an outer diameter side part of the ring part 36, A plurality of tongue-shaped protrusions and slit-shaped cutouts are provided alternately at a constant pitch in the circumferential direction. By providing such a protruding portion and a notch, a part of the cylindrical portion 35 and a portion of the circular ring portion 36 is provided with a rotating comb-like edge 38.
a, 38b.

The sensor 34 comprises a permanent magnet 39, a stator 40, and a coil 41, each of which has an annular shape. These members 39 to 41 are concentric with each other and with the hub 4 and the tone wheel 33. Have been placed.
Among them, the permanent magnet 39 extends in the axial direction (see FIG.
(Left and right directions of 2). The magnetization direction does not change over the entire circumference. In the illustrated example, the outer end face is an S pole and the inner end face is an N pole. However, even if the magnetization direction is reversed,
No problem.

The stator 40 is made of a magnetic metal plate such as a soft steel plate such as SPCC, and has an L-shaped cross section and is formed in an annular shape as a whole. That is, the stator 40 includes the circular ring portion 4.
2, a cylindrical portion 43 bent at a right angle from the inner peripheral edge of the annular portion 42 toward the outside in the axial direction, and a continuous portion 44 for connecting the annular portion 42 and the cylindrical portion 43 to each other. In such a stator 40, a portion of the annular portion 42 closer to the outer diameter of the outer surface abuts against the inner end surface of the permanent magnet 39, which is one end surface in the magnetization direction of the permanent magnet 39. Therefore, the stator 40 is combined in series with the magnetization direction of the permanent magnet 39 in a state of being magnetically conductive with the permanent magnet 39.

The coil 41 is connected to the stator 40
Is attached to the inner half of the outer surface. This coil 41
Is formed by winding a conducting wire 46 around an annular bobbin 45 having a U-shaped cross section and made of a non-magnetic material such as a synthetic resin and having an outer diameter side opened, and corresponding to a change in magnetic flux flowing in the stator 40, A voltage is induced on conductor 46. Both ends of the conducting wire 46 are connected to a harness (not shown) and communicate with a controller (not shown).

A plurality of protrusions and notches are provided at the inner diameter side end of the stator 40, that is, at the inner diameter side end of the cylindrical portion 43 and the continuous portion 44 and the annular portion 42, respectively.
They are provided alternately and at equal pitch in the circumferential direction. By providing such a protruding portion and the notch, a stationary comb-like edge portion 47 is formed at the inner diameter side end portion of the stator 40. The pitch of the stationary-side comb tooth-shaped edge portions 47 is made equal to the pitch of the two rotating side comb tooth-shaped edge portions 38a, 38b. Further, a gear-shaped concave / convex portion 48 is formed on the outer end surface which is the other end surface in the magnetization direction of the permanent magnet 39.
The pitch of the concavo-convex portions 48 is equal to the pitch of both the rotating and stationary comb-like edge portions 38a, 38b, 47.

At the moment when the plurality of protrusions forming the uneven portion 48 face the plurality of protrusions forming the rotating comb-shaped edge 38b, the stationary comb-shaped edge 47 is removed. The projections and depressions 48 and 1 are arranged such that the plurality of projections constituting the rotation-side comb-shaped edge 38a face the plurality of projections constituting the rotation-side comb-like edge 38a.
The phase between the pair of rotating comb-shaped edges 38a and 38b and the stationary comb-shaped edges 47 is regulated.

The sensor 34 comprising the permanent magnet 39, the stator 40 and the coil 41 as described above is made of a synthetic resin and is embedded in an annular holder 49. In the example shown in the figure, the entirety of the components 39 to 41 is embedded in the holder 49 to prevent rainwater or the like from entering the boundary between the components 39 to 41 and the synthetic resin, thereby preventing corrosion and insulation. The aim is to prevent the occurrence of failures such as defects. A portion near the outer diameter of the holder 49 encloses a base half (a right half in FIGS. 1 and 2) of a mounting ring 50 formed of a metal such as stainless steel or the like in a circular shape with a crank-shaped cross section. It is embedded and fixed. Then, until the part of the holder 49 comes into contact with the inner end surface of the outer ring 1, the first half (the left half in FIGS. 1 and 2) of the mounting ring 50 is attached to the inner end of the outer ring 1. By fitting, the sensor 3
4 is supported and fixed to the inner end of the outer race 1.

In this manner, the sensor 34 is connected to the outer ring 1.
In the state where the sensor 34 is fixedly supported, the uneven portion 48 of the permanent magnet 39 and the stationary comb-like edge 47 of the stator 40 constitute a pair of rotary comb-like teeth provided on the tone wheel 33. The end portions 38a and 38b are opposed to each other with a small gap all around. In this state, the holder 4
A gap 51 is provided between the inner side surface of 9 and the metal core 21 constituting the seal member 20. Axial dimension △ ₅₁ of the gap 51, than the axial dimension △ ₅₂ of the gap 52 between the outer end surface of the housing portion 15 which constitutes a disc spring portion 26 of the drive shaft member 13 which constitutes the core metal 21 Is also large (△ ₅₁
> △ ₅₂ ). Therefore, even if the disc spring portion 26 is completely crushed based on the thrust load applied to the hub 4, the holder 49 does not collide with the metal core 21, and the holder 49 is not damaged. Prevention.

In the case of the rolling bearing unit with the rotation speed detecting device of the present invention configured as described above, the rotation of the drive shaft (not shown) connected to the inner ring (not shown) constituting the constant velocity joint constitutes the hub 4. The driving force is transmitted to a driving wheel (not shown) fixed to the mounting flange 11, and the driving wheel is rotationally driven. When the tone wheel 33 rotates together with the hub 4, the protrusions of the concave and convex portions 48 of the permanent magnet 39 constituting the sensor 34 and the protrusions of the stationary comb-like edge 47 of the stator 40 are moved by the tone wheel 33. 1 provided in
The protruding portions and the notches of the pair of rotating comb-like edge portions 38a, 38b are alternately opposed. That is, at a certain moment, the plurality of protrusions forming the uneven portion 48 are turned to the rotating comb-shaped edge portion 38.
b, and at the same time, the plurality of protrusions forming the stationary comb-like edge 47 oppose the plurality of protrusions forming the rotating comb-like edge 38a. . At this moment, the amount of magnetic flux flowing in the stator 40 increases.

On the other hand, at the next moment, the plurality of projections forming the projections and depressions 48 are turned to the rotating comb-shaped edge 38b.
At the same time as the plurality of notches constituting the stationary comb-toothed edge portion 47, the plurality of protrusions constituting the stationary-side comb-tooth-shaped edge portion 47 face the plurality of notches constituting the rotating-side comb-tooth edge portion 38a. At this moment, the amount of magnetic flux flowing in the stator 40 is reduced. Such a change in the amount of magnetic flux
It is performed simultaneously and over the entire circumference at the two locations of the uneven portion 48 and the stationary comb-like edge portion 47. With such a change in the amount of magnetic flux, a voltage that changes in a sinusoidal manner is induced in the coil 41. Since the frequency of this change is proportional to the rotation speed of the hub 4, if the voltage induced in the coil 41 is sent to a controller (not shown) by a harness (not shown), the rotation of the wheels supported and fixed to the hub 4 will be described. By determining the speed, the ABS and TCS can be controlled appropriately. In particular, in the case of the present invention, since the change in the magnetic flux flowing through the stator 40 is large, the voltage induced in the coil 41 attached to the stator 40 increases, and the reliability of the rotation speed detection is ensured. I can do it.

Moreover, in the case of the rolling bearing unit with the rotation speed detecting device of the present invention, the portions for changing the amount of the magnetic flux are provided at two positions shifted in the diameter direction. The size in the axial direction can be reduced, the size can be reduced, and it can be incorporated into a small rolling bearing unit. Further, by narrowing the width of the protrusion and the notch provided on the tone wheel 33, the pitch at which the magnetic characteristics of the tone wheel 33 change is narrowed,
It is possible to increase the accuracy of rotation speed detection. Since it is easier to reduce the width between the protruding portion and the notch than to reduce the magnetizing pitch of the permanent magnet, it is possible to suppress the increase in cost required for higher precision.

In the illustrated example, the lid 28 that closes the opening at the outer end of the space where the engagement portion between the spline shaft 14 and the spline hole 12 exists is formed by attaching the blocking plate 30 to the inside of the fitting fixing portion 29. By providing the closing plate portion 30 on the edge side, the closing plate portion 30 is made to closely approach the distal end surface of the spline shaft 14. Therefore,
As described above, the volume of the space in which the engaging portion exists can be reduced by the amount by which the closing plate portion 30 is brought into close proximity to the tip end surface of the spline shaft 14. As a result, the amount of grease sealed in this space can be reduced for rust prevention and the like, which can contribute to cost reduction. In the illustrated example, the spline shaft 14 is prevented from falling out of the spline hole 12 by the metal retaining ring 19, so that the separation between the hub 4 and the drive shaft member 13 can be reliably prevented. . Further, the holder 49 covers the entire periphery of the sliding contact portion between the leading edge of the seal lip 27 and the inner end surface of the inner ring 6. Therefore, the rainwater or the like wound up by the wheels during traveling on rainy weather does not directly and vigorously hit the sliding contact portion, and the sealing property by the seal lip 27 can be sufficiently ensured.

[0028]

[Application] Although the present invention is outside the scope of the present invention, in applications where the diameter of the tone wheel is large and a sufficient output voltage can be obtained, the circular ring portion of the tone wheel having an L-shaped cross section has a rotating comb-like end. Instead of forming an edge portion, a structure in which the above-mentioned ring portion and the permanent magnet are simply magnetically connected may be employed. Even with such a structure, a closed loop magnetic circuit is provided, so that the leakage magnetic flux is reduced, and a large output voltage is obtained as compared with a magnetic sensor having an open loop magnetic circuit which has been widely used in the past. can get. In this case, the outer end-side magnetized surface of the permanent magnet facing the ring portion of the tone wheel does not need to have an uneven shape. If there is enough output voltage,
By adopting such a shape, the processing cost can be reduced.

[0029]

The rolling bearing unit with the rotation speed detecting device of the present invention is constructed and operates as described above. However, it is possible to reduce the size and increase the accuracy and to improve the reliability of the rotation speed detection. Since the output of the sensor can be increased, the degree of freedom in design is high, and it can contribute to the improvement of the performance of ABS and TCS.

[Brief description of the drawings]

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

FIG. 2 is an enlarged view of a portion A in FIG.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Outer ring 2 Mounting part 3 Outer ring track 4 Hub 5 Inner ring track 6 Inner ring 7 Small diameter step part 8 Caulking part 9 Rolling element 10 Seal ring 11 Mounting flange 12 Spline hole 13 Drive shaft member 14 Spline shaft 15 Housing part 16 Lock groove 17 Inside Engagement groove 18 Stepped portion 19 Retaining ring 20 Seal member 21 Metal core 22 Elastic material 23 Cylindrical portion 24 Ring portion 25 Inclined portion 26 Disc spring portion 27 Seal lip 28 Lid 29 Fitting fixing portion 30 Closing plate portion 31 Flange portion 32 step portion 33 tone wheel 34 sensor 35 cylindrical portion 36 circular ring portion 37 continuous portion 38a, 38b rotating comb-like edge 39 permanent magnet 40 stator 41 coil 42 circular ring portion 43 cylindrical portion 44 continuous portion 45 bobbin 46 conducting wire 47 stationary side comb-shaped edge portion 48 uneven portion 49 holder 50 mounting ring 51 gap 52 gap

Claims (1)

[Claims] 1. A rotating wheel having a rotating raceway on a rotating circumferential surface and rotating at the time of use, and a stationary raceway at a stationary circumferential surface facing the rotating circumferential surface and not rotating during use. A stationary wheel, a plurality of rolling elements rotatably provided between the rotating-side track and the stationary-side track, and an annular tone fixed to a part of the rotating wheel concentrically with the rotating wheel Wheels and
In a rolling bearing unit with a rotation speed detection device provided with an annular sensor supported by the stationary wheel and opposed to the tone wheel, the tone wheel is made of a magnetic material, and has a cylindrical portion and a cylindrical portion. An annular portion bent in the diametric direction from one axial edge of the axial direction, and a continuous portion that connects the cylindrical portion and the annular portion, and a part of the cylindrical portion and the annular portion is separated from the continuous portion. A plurality of protrusions and notches are provided on the portion alternately and at equal pitches in the circumferential direction to form rotating comb-shaped edges, respectively. An annular permanent magnet which is arranged concentrically with the wheel and the tone wheel and is magnetized in one direction over the entire circumference, and in a state where it is magnetically connected to one end face of the permanent magnet in the magnetizing direction, Perpendicular to the magnetization direction of the permanent magnet An annular stator made of a magnetic material combined with the above, and an annular coil attached to the stator and generating a voltage in response to a change in magnetic flux flowing through the stator. By providing a plurality of projections and notches alternately and at equal pitches in the circumferential direction at the end opposite to the continuous portion with the permanent magnet at the portion, the rotating comb-like end is provided. A stationary comb-shaped edge is formed at an equal pitch with the edge, and gear-shaped irregularities are formed at the same pitch as the rotating and stationary comb-shaped edges at the other end surface in the magnetizing direction of the permanent magnet. At the moment when the plurality of projections forming the uneven portion face any one of the plurality of projections forming the rotating comb-like edge, the stationary comb-like end is formed. A plurality of protrusions forming an edge constitute a plurality of protrusions forming another rotating side comb-like edge Speed sensing rolling bearing unit, characterized in that opposite the.