JP6555366B2 - Rolling bearing unit with sensor - Google Patents

Description

  The present invention relates to an improvement in a rolling bearing unit with a sensor that supports a wheel (driven wheel) of an automobile rotatably with respect to a suspension device and includes a sensor for detecting the rotational speed of the wheel, for example.

  2. Description of the Related Art Conventionally, various structures are known as rolling bearing units with a rotational speed detecting device for rotatably supporting a wheel on a suspension device of an automobile and detecting the rotational speed of the wheel. In any structure, the detection part of the sensor supported and fixed to the non-rotating part is opposed to the detection surface of the encoder supported and fixed to a part of the hub that rotates together with the wheel. And it is comprised so that the rotational speed of the said wheel which rotates with this encoder may be calculated | required based on the frequency or the period of the output signal of this sensor which changes with rotation of the said encoder.

  This encoder is used to prevent the encoder constituting the rolling bearing unit with such a rotational speed detection device from being damaged by adhesion of muddy water, dust, etc., or when foreign particles such as magnetic powder adhere to this encoder. In order to prevent the reliability of rotation speed detection from being impaired, a structure in which the encoder is separated from the outside by a cap made of a nonmagnetic plate has been conventionally known, as described in Patent Document 1, for example. FIG. 14 shows an example of the structure described in Patent Document 1 among them.

  This rolling bearing unit 1 with a rotational speed detection device is formed by combining a rolling bearing unit 2 and a rotational speed detection device 3. Among them, the rolling bearing unit 2 includes an outer ring 4, a hub 5, and a plurality of rolling elements 6 and 6. Outer ring 4 has double-row outer ring raceways 7a and 7b on the inner peripheral surface and stationary flange 8 on the outer peripheral surface. And the outer ring | wheel 4 is supported by the knuckle 9 which comprises a suspension apparatus, and does not rotate in use condition. The hub 5 is formed by coupling and fixing a hub body 10 and an inner ring 11 by a caulking portion 12. The hub 5 has double-row inner ring raceways 13 a and 13 b on the outer peripheral surface, and is arranged on the inner diameter side of the outer ring 4. The outer ring 4 is supported concentrically. Further, the outer end of the hub body 10 in the axial direction (outside in the axial direction means the side that is outside the width direction of the vehicle body when assembled to the suspension device. In the entire specification and claims) The rotation side flange 14 for supporting the wheel is provided at a portion protruding outward in the axial direction from the axially outer end opening of the outer ring 4. The rolling elements 6 and 6 are held by the cages 15 and 15 between the outer ring raceways 7a and 7b and the inner ring raceways 13a and 13b. It is provided so that it can roll freely. Furthermore, both axial ends of the internal space 16 in which the rolling elements 6 and 6 are installed are closed by a seal ring 17 and a cap 18.

  The cap 18 is made of a nonmagnetic plate such as a nonmagnetic metal plate such as an aluminum alloy plate or an austenitic stainless steel plate. Such a cap 18 includes a cap bottom plate portion 19 and a cap cylindrical portion 20 bent at a right angle outward from the outer peripheral edge of the cap bottom plate portion 19 in the axial direction. In the structure of FIG. 14, since the rolling bearing unit 2 for a driven wheel (rear wheel of FF vehicle, front wheel of FR vehicle, MR vehicle) is targeted, the cap bottom plate portion 19 is connected to the inner end of the outer ring 4 in the axial direction. As a disc shape that covers the entire opening (inner side in the axial direction means the side closer to the center in the width direction of the vehicle body in the state assembled to the suspension device. The same applies to the entire specification and claims). Yes.

  On the other hand, the rotational speed detection device 3 includes an encoder 21 and a sensor unit 22. The encoder 21 includes a support ring 23 having a magnetic metal plate having an L-shaped cross section and a ring shape as a whole, and an encoder body 24 made of a permanent magnet such as a rubber magnet. The encoder main body 24 is magnetized in the axial direction, and by alternately changing the magnetization direction with respect to the circumferential direction at equal intervals, the S pole and the N pole are provided on the inner side surface in the axial direction, which is the detected surface. These are arranged alternately and at equal intervals. The detected surface of the encoder main body 24 is in close proximity to the axially outer side surface (inner surface) of the cap 18 with a minute gap therebetween. In other words, the cap 18 is pushed into the axially inner end of the outer ring 4 until the axially outer surface of the cap bottom plate 19 is in close proximity to the detected surface of the encoder body 24.

Further, the sensor unit 22 includes a sensor 34 and a sensor holder 25. Among them, the sensor 34 is provided with a magnetic detection element such as a Hall element or a magnetoresistive element in the detection unit, and changes an output signal in response to a change in characteristics of the detection surface of the encoder body 24. . The sensor holder 25 is formed by injection molding synthetic resin, and includes a holder main body 26 that holds the sensor 34 and a mounting plate portion 27 that is fixed to the knuckle 9. Such a sensor unit 22 has a male screw portion of a bolt 29 inserted through a through hole formed in the mounting plate portion 27 in a state where the holder body 26 is inserted into a sensor insertion hole 28 formed in the knuckle 9. The knuckle 9 is fixed to the knuckle 9 by screwing into a female screw portion of a bottomed screw hole 30 formed in the knuckle 9.

As described above, the detection portion of the sensor 34 held by the sensor holder 25 is brought into contact with the inner side surface (outer surface) in the axial direction of the cap bottom plate portion 19 while being supported and fixed to the knuckle 9. . In this state, the detection portion faces the detection surface of the encoder body 24 through the cap bottom plate portion 19. The encoder main body 24 in this state, rotates together with the hub 5, the vicinity of the detection portion of the sensor 34, the S and N poles that exist in the detected face passes alternately output of the sensor 34 Changes. Since the frequency of this change is proportional to the rotational speed of the hub 5 and the period of the change is inversely proportional to the rotational speed, the rotational speed of the wheel fixed to the hub 5 can be obtained based on either.

  In the case of the conventional structure shown in FIG. 14 as described above, the permanent magnet encoder body 24 and the external space are separated by the cap 18 made of a non-magnetic plate. It can prevent foreign matter such as magnetic powder from adhering. Therefore, it is possible to ensure the reliability of rotation speed detection using the encoder body 24 while keeping the detected surface in a clean state. However, there is room for improvement in the following points from the aspect of further improving the reliability of the rotational speed detection.

In order to sufficiently change the output signal of the sensor 34 with the rotation of the encoder body 24, it is necessary to sufficiently increase the positioning accuracy of the sensor 34 with respect to the encoder body 24. On the other hand, in the case of the conventional structure, the sensor 34 is supported and fixed to the knuckle 9, and there are many members existing between the encoder body 24 and the sensor 34 , so the positioning accuracy is ensured. Hard to do. In particular, the positioning accuracy between the outer ring 4 and the knuckle 9 is not sufficiently high in terms of rotational speed detection, which is disadvantageous in terms of ensuring the amount of change in the output signal of the sensor 34. .
In the case of the conventional structure described above, the detection portion of the sensor 34, the in the sensed surface of the encoder main body 24, because they are opposed to each other through a cap bottom plate portion 19 of the cap 18, the detection unit of the sensor 34 In addition, the distance (air gap) between the encoder body 24 and the detected surface tends to be large, which may be disadvantageous in terms of ensuring the amount of change in the output signal of the sensor 34 .

Therefore, Patent Document 2 describes the structure of a rolling bearing unit with a rotational speed detection device as shown in FIG. In the case of this structure, the nut fixing concave portion 31 formed at the radial center portion (position concentric with the rotation axis of the hub 5) of the axially inner side surface of the cap bottom plate portion 19a constituting the bottomed cylindrical cap 18a. Further, the sensor mounting nut 32 is press-fitted and fixed. In addition, the sensor held by the sensor holder 25 by screwing the male screw portion of the bolt with the female screw portion 33 of the sensor mounting nut 32 via a mounting plate portion (not shown) constituting the sensor holder 25. 34 is fixed to the cap 18a. In the case of such a structure described in Patent Document 2, the problems of the structure described in Patent Document 1 can be solved. However, in the case of the structure described in Patent Document 2, when the bolt is screwed into the sensor mounting nut 32, the sensor holder 25 is rotated by the tightening (rotation) torque of the bolt, and the encoder 21 It may be difficult to regulate the positional relationship with the sensor 34 . The magnetic detection element used in the sensor 34 has a magnetic detection directionality. Therefore, when the sensor mounting nut 32 is not installed concentrically with the rotating shaft of the hub 5 (encoder 21), when the sensor holder 25 is rotated by the tightening (rotating) torque of the bolt, the encoder 21 is rotated. The detection surface of the (encoder main body 24) may deviate from the detection directionality of the magnetic detection element, and the output signal of the sensor 34 may be reduced. In other words, like the structure described in the above-mentioned Patent Document 2, in the case where the sensor holder 25 may be rotated by the tightening (rotating) torque of the bolt, Accordingly, in order to prevent the detection surface of the encoder 21 (encoder main body 24) from deviating from the detection directionality of the magnetic detection element, the installation position of the sensor mounting nut 32 is set to the hub 5 (encoder 21). ) Must be concentric with the rotation axis. For this reason, the freedom degree of installation of the nut 32 for sensor attachment, and the freedom degree of design of a sensor unit will become low.

JP 2000-249138 A JP2011-196425A

  In view of the circumstances as described above, the present invention prevents the sensor unit from rotating due to the tightening torque of the bolt when the bolt for fixing the sensor unit to the cap is tightened. The invention was invented to realize a structure of a rolling bearing unit with a sensor capable of regulating the positional relationship.

The rolling bearing unit with a sensor of the present invention is used to rotatably support a wheel for a driven wheel with respect to a suspension device such as a knuckle, and includes an outer ring, a hub, a plurality of rolling elements, and an encoder. And a cap and a sensor unit.
Among these, the outer ring has a double row outer ring raceway on the inner peripheral surface, and does not rotate during use.
The hub has a double-row inner ring raceway on the outer peripheral surface, and a rotation-side flange for supporting a wheel on a portion of the outer peripheral surface that protrudes axially outward from the axial outer end of the outer ring. And is supported concentrically with the outer ring on the inner diameter side of the outer ring.
Each of the rolling elements is provided between the outer ring raceways and the inner ring raceways so as to be capable of rolling plurally for each row.
The encoder is formed by alternately changing the magnetic characteristics of the inner surface in the axial direction with respect to the circumferential direction, and is supported concentrically with the hub at the inner end in the axial direction of the hub.
The cap is attached to an inner end portion in the axial direction of the outer ring and closes an opening portion in the axial direction of the outer ring.
The sensor unit includes a sensor and a sensor holder.
Among these sensors, the output signal is changed in response to a change in the characteristics of the detected surface of the encoder while facing the detected surface of the encoder.
The sensor holder holds the sensor and is supported by a portion of the cap that faces the encoder in the axial direction.

Particularly in the case of the rolling bearing unit with sensor of the present invention, the cap includes a cap body, a sensor mounting nut, and a seal member .
The cap body is made of a non-magnetic metal plate and has a bottomed cylindrical shape. The cap body is fitted and fixed to the inner end of the outer ring in the axial direction. And a cap bottom plate portion that closes the end opening.
The sensor mounting nut is integrally or separately provided on the cap bottom plate portion.
The seal member is integrally formed of rubber, and is fixed to the outer peripheral surface of the cap cylindrical portion over the entire periphery by vulcanization adhesion.
The sensor unit abuts at least a part of an axially outer surface of a holder main body, which is a part of the sensor holder holding the sensor, in contact with an axially inner side surface of the cap bottom plate part, and the holder main body And a cap side engaging portion made of rubber integrally formed with the seal member and vulcanized and bonded to the inner side surface in the axial direction of the cap bottom plate portion; Are coupled and fixed to the cap by a bolt screwed to the sensor mounting nut in a state of being engaged in the circumferential direction.

When practicing the present invention, among the axially outer side of the sensor holder, a part superimposed on the sensor and the axial direction, the not abut against the axially inner side of the cap bottom plate portion (providing the gap) -like I can do it . Specifically, for example , the axially outer surface of the sensor holder is overlapped with the sensor in the axial direction so as not to contact the axially inner surface of the cap bottom plate portion, and the holder side engagement. A joint portion is formed, and a contact portion pressed against the cap bottom plate portion, and a non-contact portion and the contact portion can be constituted by a continuous step portion.

Although outside the technical scope of the present invention, the holder-side engaging portion, while constituting a projection or recess formed in the axially outer side of the sensor holder, the cap side engaging portion, It can also be constituted by a concave portion or a convex portion formed on the inner surface in the axial direction of the cap bottom plate portion, and the holder side engaging portion and the cap side engaging portion can be engaged with each other .

Alternatively, the pre-Symbol holder-side engaging portion, constituted by the circumferential side surface of the holder body, the cap side engaging portion, be constituted by the convex portion formed in the axial direction in the side surface of the cap bottom plate You can also .

Additionally or alternatively, the sensor mounting nut is fixed to the cap bottom plate by press-fitting and fixing the axial inner end of the sensor mounting nut into a nut fixing through hole formed in the cap bottom plate portion. It can be fixed directly on the outside in the axial direction . In this case , the outer peripheral surface and the axially outer end surface of the sensor mounting nut are covered with a rubber nut cover portion formed integrally with the seal member and the cap side engaging portion.

According to the rolling bearing unit with a sensor of the present invention having the above-described configuration, when the bolt for fixing the sensor unit to the cap is tightened, the sensor unit is rotated by the tightening (rotation) torque of the bolt. The positional relationship between the sensor and the encoder can be regulated.
That is, in the case of the present invention, the holder side engaging portion provided in the sensor holder constituting the sensor unit and the cap side engaging portion provided on the inner side surface in the axial direction of the cap bottom plate portion of the cap are arranged in the circumferential direction. A bolt for fixing the sensor unit to the cap can be tightened in a state of being engaged with the cap. Therefore, it is possible to prevent the sensor unit from rotating (rotating) based on the tightening (rotation) torque of the bolt. As a result, since the positional relationship between the encoder and the sensor can be restricted, it is not necessary to install the sensor mounting nut concentrically with the rotating shaft of the hub (encoder). Therefore, according to this invention, the freedom degree of installation of the nut for sensor attachment and the freedom degree of design of a sensor unit can be aimed at.
Further, the sensor unit can be attached to the cap by preventing a portion of the outer surface in the axial direction of the sensor holder that is overlapped with the sensor in the axial direction from coming into contact with the inner side surface in the axial direction of the cap bottom plate. In the assembled state, it is possible to prevent the pressure held by the contact between the sensor holder and the cap bottom plate from being applied to the sensor held by the sensor holder.

The fragmentary sectional view which shows the rolling bearing unit with a sensor which shows the 1st example of the reference example of this invention. Similarly, the figure which shows the assembly | attachment state of a sensor unit in the state seen from the axial direction inner side. The figure corresponded to the A section of FIG. 1 which shows an example of another structure of a sensor side engaging part and a cap side engaging part. The figure similar to FIG. 1 which shows the 2nd example of the reference example of this invention. Similarly, the same figure as FIG. The figure similar to FIG. 1 which shows the 3rd example of the reference example of this invention. Similarly, the same figure as FIG. Similarly, the fragmentary sectional view of the cap corresponded to XX of FIG. The figure similar to FIG. 1 which shows the 4th example of the reference example of this invention. Similarly, the same figure as FIG. Similarly, the fragmentary sectional view of the cap corresponded to YY of FIG. The figure similar to FIG. 1 which shows an example of embodiment of this invention. Similarly, the same figure as FIG. The half part sectional view which shows the 1st example of the conventional structure of a rolling bearing unit with a rotational speed detection apparatus. Similarly, the fragmentary sectional view of the rolling bearing unit with a rotational speed detection apparatus which shows the 2nd example of a conventional structure.

[First example of reference example ]
1-3 have shown the 1st example of the reference example of this invention. The feature of this reference example is that the structure of the cap 18b that closes the axially inner end opening of the outer ring 4 is devised. For the construction and effects of the other portions, so basically the case of the conventional structure described above is the same, illustration and description duplicate the omitted or simplified, less, wherein parts and preceding the present reference example The explanation will focus on the parts that were not explained in.

The sensor-equipped rolling bearing unit 1a of the present reference example rotatably supports a wheel, which is a driven wheel, with respect to a suspension device such as a knuckle 9 (see FIG. 14) and detects, for example, the rotational speed of the wheel. A hub 5 that is a rotating ring is rotatably supported via a plurality of rolling elements 6 on the inner diameter side of the outer ring 4 that is a stationary ring.

The hub body 10 constituting the outer ring 4 and the hub 5 is made of medium carbon steel such as S53C, and at least the surface of each track 7a, 7b, 13a (see FIG. 14) is subjected to hardening treatment such as induction hardening. Has been. On the other hand, the inner ring 11 and the rolling elements 6 constituting the hub 5 are made of high carbon chrome bearing steel such as SUJ2, and are subjected to a hardening process by, for example, full quenching. The rolling elements 6 to be used are not limited to balls as shown in FIG. When the rolling bearing unit with sensor 1a of this reference example is used for an automobile having a heavy weight, a tapered roller can be used as the rolling element 6.

  An encoder 21 is fitted and fixed (press-fit) to the axially inner end (right end in FIG. 1) of the outer peripheral surface of the inner ring 11 constituting the hub 5. The encoder 21 includes a support ring 23 and an encoder body 24. Of these, the support ring 23 has a substantially L-shaped cross section by pressing a ferritic stainless steel plate such as SUS430 or a cold rolled steel plate of magnetic material such as SPCC subjected to rust prevention treatment. It is formed in an annular shape. The support ring 23 is a cylindrical fitting cylinder 35 and a circle that is bent in a radially outward direction from the axially inner end (right end in FIG. 1) of the fitting cylinder 35. It is comprised from the ring part 36. FIG. The encoder body 24 is formed in a ring shape by a permanent magnet such as a rubber magnet or a plastic magnet mixed with a magnetic material such as ferrite powder, and is magnetized in the axial direction and the direction of magnetization. These are changed alternately and at equal intervals in the circumferential direction. Then, with such an encoder body 24 attached to the inner surface in the axial direction of the annular portion 36, the inner surface in the axial direction (detected surface) of the encoder body 24 is set in the axial direction of the hub body 10. The caulking portion 12 formed at the end portion is positioned radially outward.

The cap 18b attached to the inner end of the outer ring 4 in the axial direction includes a metal cap body 37, a sensor mounting nut 32a, and a seal member 38.
Of these, the cap body 37 has a bottomed cylindrical shape (a petri dish with a substantially U-shaped cross section) by pressing a metal plate made of a non-magnetic material such as an austenitic stainless steel plate or an aluminum alloy plate. ). Such a cap body 37 includes a cap cylindrical portion 20a and a cap bottom plate portion 19b that closes an axially inner end opening of the cap cylindrical portion 20a.

The outer peripheral surface of the outer half portion in the axial direction of the cap cylindrical portion 20a is formed in a cylindrical surface shape whose outer diameter does not change in the axial direction. On the other hand, the outer peripheral surface of the inner half portion in the axial direction of the cap cylindrical portion 20a is formed in a tapered surface shape that is inclined in a direction in which the outer diameter dimension decreases toward the inner side in the axial direction.
Further, in the cap bottom plate portion 19b, press working is performed at two positions that are radially inward from the portion facing the detection surface of the encoder 21 (encoder main body 24) in the axial direction and separated in the circumferential direction. The cap-side engaging recesses 39, 39 having a partially concave spherical shape (semispherical shape) on the inner surface formed by the above are formed. For this reference example, each of these caps-side engaging recesses 39 and 39, corresponds to the caps-side engaging portion. The number and shape of the cap-side engaging recesses 39, 39 are not limited to those in the present reference example , but austenitic stainless steel is easily magnetized by pressing, so that the cap-side engaging recess 39 , 39 and the sensor 34 are preferably provided in an even number. In addition, forming the cap-side engaging recesses 39 and 39 as far apart as possible reduces the influence on sensing when the cap-side engaging recesses 39 and 39 are magnetized by pressing. It is preferable from the viewpoint.
Further, a nut fixing recess 31 having a circular shape when viewed from the axial direction is formed at a portion near the center in the radial direction of the cap bottom plate portion 19b (a position not concentric with the rotation axis of the hub 5 (encoder 21)). Yes. The nut fixing recess 31 includes a central portion in the radial direction of the cap bottom plate portion 19b {a position concentric with the rotation shaft of the hub 5 (encoder 21)} and can be formed at an appropriate position.

  The sensor mounting nut 32a is a so-called press-fit nut that penetrates in the axial direction, and a small-diameter portion provided on the outer surface in the axial direction is inserted into the recess 31 for fixing the nut from the inner side in the axial direction of the cap bottom plate portion 19b. It is fixed by press-fitting. The structure of the sensor mounting nut 32a is substantially the same as that of a general press-fit nut. Further, the sensor mounting nut 32a may have a structure that does not penetrate in the axial direction, that is, a cap nut shape.

  The sealing member 38 is a non-magnetic material, and is made of various rubbers such as acrylonitrile butadiene rubber (NBR) having a hardness of 60 to 75, natural rubber, styrene butadiene rubber, urethane rubber, silicone rubber, fluorine rubber, and acrylic rubber. The cap body 37 is integrally formed and vulcanized and bonded. Specifically, the sealing member 38 has an annular shape, and is fixed by vulcanization adhesion over the entire circumference of the outer circumferential surface of the inner half portion in the axial direction of the cap cylindrical portion 20a. In this state (free state) fixed to the cap cylindrical portion 20a, the outer diameter of the seal member 38 in the free state (state shown in FIG. 1) is the inner peripheral surface of the outer ring 4 in the axial direction inner end portion. It is larger than the inner diameter dimension.

  The cap 18b having the above-described configuration uses a device composed of a pair of molds (upper mold and lower mold), and the sensor is mounted in a cavity defined between the molds. It can be made by pouring vulcanized molten rubber into the cavity in a state where the cap body 37 to which the nut 32a is fixed is disposed.

  The cap 18b having the above-described configuration is directly fitted on the outer ring 4 with the outer peripheral surface of the outer half of the axial direction of the cap cylindrical portion 20a on the inner peripheral surface of the inner end of the outer ring 4 in the axial direction (metal fitting). Assembled). In such an assembled state, the seal member 38 is radially disposed between the outer circumferential surface of the inner half of the axial direction of the cap cylindrical portion 20a and the inner circumferential surface of the inner end of the outer ring 4 in the axial direction. It is sandwiched in a compressed state. In this state, a portion of the outer surface in the axial direction of the cap bottom plate portion 19b that faces the detected surface of the encoder 21 passes through a predetermined axial gap (air gap) with respect to the detected surface. , Close proximity.

In the case of this reference example , the sensor unit 22a for detecting the rotational speed is supported and fixed to the cap 18b having the above-described configuration. The sensor unit 22a includes a sensor 34 and a sensor holder 25a. Among them, the sensor 34 has a magnetic detection element such as a Hall element or a magnetoresistive element installed in the detection unit, and changes the output signal in response to a change in the characteristics of the detected surface of the encoder 21. The sensor holder 25a is formed by injection molding a synthetic resin such as polyamide resin, has a substantially L-shaped cross section, and includes a mounting plate portion 27a and a holder body 26a.

  Of these, the mounting plate portion 27a is for fixing the holder body 26a to the cap 18b, and has a rectangular shape when viewed from the axially inner side. Such a mounting plate portion 27a is formed integrally with the base half portion (axially inner half portion) of the holder body 26a, and the holder side through hole 40 is formed at a position aligned with the nut fixing recess 31. Has been.

The holder body 26a holds the sensor 34 on the inner side thereof, and is formed in a rectangular parallelepiped shape whose shape viewed from the inner side in the axial direction. Also, the difference between the holder main body 26a and the thickness _{T 26a} in the axial direction of the (portion other than the holder-side engaging protrusion 41 to be described later), the thickness _{T 27a} in the axial direction of the mounting plate portion 27a Is (T _26a -T _27a ) the same as the nut height H _32a which is the height of the sensor mounting nut 32a that protrudes inward in the axial direction from the axial inner surface of the cap bottom plate portion 19b? Slightly larger ( _T26a - _T27a = _H32a or _T26a - _T27a > _H32a ). Further, in the axially outer side surface of the holder main body 26a, the axially outwardly projecting state is located at two positions that are separated in the circumferential direction of the radially inner portion from the portion that overlaps the sensor 34 in the axial direction. Thus, holder-side engaging convex portions 41, 41 having outer convex surfaces that are partially convex spherical (hemispherical) are formed. For this reference example, each of these holder side engaging protrusion 41 corresponds to the Holder side engaging portion. Such a holder body 26a is disposed at a portion facing the encoder 21 in the axial direction in a state where the sensor unit 22a is supported and fixed to the cap 18b.

The sensor unit 22a as described above engages the holder-side engagement convex portions 41, 41 and the cap-side engagement concave portions 39, 39 formed on the outer surface in the axial direction of the holder body 26a. And the entire outer surface of the holder body 26a in the axial direction is brought into contact with the inner surface of the cap bottom plate portion 19b in the axial direction with respect to the cap 18b (cap body 37) by the bolt 29a. The support is fixed. Specifically, in a state where the shaft portion of the bolt 29a is inserted through the holder side through hole 40, the female screw portion 33a of the sensor mounting nut 32a in which the male screw portion 42 of the bolt 29a is fixed to the cap bottom plate portion 19b. And tightening the bolt 29a in a state where the axially outer side surface of the head of the bolt 29a is in contact with the periphery of the holder side through hole 40 of the mounting plate portion 27a, It is supported and fixed to the cap 18b (cap body 37). In the case of this reference example , when the bolt 29a is tightened in this way, the holder side engaging convex portions 41, 41 and the cap side engaging concave portions 39, 39 are engaged in the circumferential direction. The position of the sensor unit 22a is not shifted by the tightening (rotation) torque of the bolt 29a.

In the case of this reference example , recesses (cap-side engagement recesses 39, 39) are formed in the cap bottom plate portion 19b that constitutes the cap 18b, and the axially outer side surface of the holder body 26a that constitutes the sensor holder 25a. Although the convex portions (holder-side engaging convex portions 41, 41) are formed in the concave portions, the concave portions and the convex portions can be formed in reverse. That is, as shown in FIG. 3, a convex portion (cap-side engaging convex portion 43) is formed on the cap bottom plate portion 19b constituting the cap 18b, and a concave portion (holder) is formed on the holder main body 26a constituting the sensor holder 25a. A side engaging recess 44) can also be formed. Moreover, various shapes that can be engaged in the circumferential direction can be adopted as the shapes of the concave and convex portions.

Also in the case of the present reference example having the above-described configuration, the wheel fixed to the hub 5 can be rotatably supported with respect to the suspension device that supports the outer ring 4. Further, when the encoder 21 is rotated together with the hub 5 with the rotation of the wheel, the vicinity of the detection portion of the sensor 34 facing the detection surface of the encoder 21 is passed through the cap bottom plate portion 19b. The N pole and the S pole existing on the detected surface 21 pass alternately. As a result, the direction of the magnetic flux flowing in the magnetic detection element constituting the sensor 34 is alternately changed, and the characteristics of the magnetic detection element are alternately changed. Since the frequency at which the characteristic of the magnetic detection element changes in this way is proportional to the rotational speed of the hub 5, the ABS and TCS can be appropriately controlled by sending the output signal of the sensor 34 to a controller (not shown).

Particularly in the case of this reference example , when the bolt 29a for fixing the sensor unit 22a to the cap 18b is tightened, the sensor unit 22a is rotated (rotated) by the tightening (rotation) torque of the bolt 29a. ) Can be prevented, and the positional relationship between the sensor 34 and the encoder 21 can be regulated.
That is, in the case of this reference example , each holder side engaging convex part 41,41 formed in the axial direction outer surface of the holder main body 26a which comprises the said sensor unit 22a, and the axis | shaft of the cap bottom board part 19b of the said cap 18b The bolt 29a can be tightened to the sensor mounting nut 32a in a state where the cap-side engaging recesses 39, 39 formed on the inner side surface in the direction are engaged in the circumferential direction. Therefore, it is possible to prevent the sensor unit 22a from rotating based on the tightening (rotation) torque of the bolt 29a. As a result, the positional relationship between the encoder 21 and the sensor 34 can be regulated.

  Further, as described above, since the sensor unit 22a does not rotate based on the tightening (rotation) torque of the bolt 29a, the installation position of the sensor mounting nut 32a is determined by the hub 5 (encoder 21). It is not limited to a position that is concentric with the rotation axis. For this reason, the freedom degree of installation of the nut 32 for sensor attachment and the freedom degree of design of the sensor unit 22a can be improved.

Further, the outer circumferential surface of the outer half portion in the axial direction of the cap cylindrical portion 20 a of the cap body 37 is directly metal-fitted to the inner circumferential surface of the inner end portion in the axial direction of the outer ring 4. For this reason, even when the use is continued, it is possible to prevent a gap or the like from being generated in the fitting portion. Further, the seal member 38 is sandwiched between the outer peripheral surface of the inner half portion in the axial direction of the cap cylindrical portion 20a and the inner peripheral surface of the inner end portion in the axial direction of the outer ring 4 in a compressed state. For this reason, it can prevent that foreign materials, such as water, penetrate | invade into the said fitting part. Therefore, according to this reference example , the sealing performance by the cap 18b can be sufficiently ensured.

The sensor unit 22a is directly fixed to the cap 18b. For this reason, compared with the structure described in Patent Document 1 described above, the number of members existing between the encoder 21 and the sensor 34 can be reduced. As a result, the positioning accuracy between the encoder 21 and the sensor 34 can be sufficiently increased. Therefore, according to this reference example , the reliability of the rotation speed detection can be improved. In the case of this reference example, the sensor unit 22a can be supported on the outer ring 4 only by fixing (press-fitting) the cap 18b to the inner end of the outer ring 4 in the axial direction. The assembly process can be simplified. In addition, the processing cost can be reduced because the knuckle is not required to be processed.

[Second example of reference example ]
4 and 5 show a second example of the reference example of the present invention. In the case of the rolling bearing unit with sensor 1c of this reference example, the structure of the sensor holder 25b constituting the sensor unit 22b is different from that of the first example of the reference example described above. Specifically, in the case of this reference example , the axially outer side surface of the holder main body 26b constituting the sensor holder 25b is arranged on the non-contact portion 45 formed on the radially outer half portion and the radially inner half portion. The formed contact portion 46 and the non-contact portion 45 and the contact portion 46 are constituted by a continuous step portion 47.

Among these, the non-contact part 45 is comprised by the radial direction outer half part including the part which overlaps with the sensor 34 among the axial direction outer surfaces of the said holder main body 26b. Such a non-contact portion 45 is not in contact with the inner surface in the axial direction of the cap bottom plate portion 19b constituting the cap 18b in a state where the sensor unit 22b is assembled to the cap 18b. For this reason, in the case of this reference example, the axial dimension of the portion of the holder body 26b that overlaps the non-contact portion 45 in the axial direction (the radially outer half of the holder body 26b). the T _45, are regulated in the following manner. That is, the holder of the main body 26b, the the non-contact portion 45 and the thickness dimension _{T 45} parts superimposed in the axial direction, a difference _{(T 45 -T 27a} of the thickness dimension _{T 27a} of the mounting plate portion 27a ) Is made smaller than the nut height H _32a , which is the height of the portion of the sensor mounting nut 32a that protrudes inward in the axial direction from the axial inner surface of the cap bottom plate portion 19b ( _{T45). -T27a} < _H32a ). In this manner, with the sensor unit 22b assembled to the cap 18b, a gap exists between the non-contact portion 45 and the inner side surface in the axial direction of the cap bottom plate portion 19b.

The abutting portion 46 is constituted by a radially inner portion of the axially outer side surface of the holder body 26b with respect to the non-abutting portion 45 . The abutting portion 46 is pressed against the inner side surface in the axial direction of the cap bottom plate portion 19b in a state where the sensor unit 22b is assembled to the cap 18b. For this reason, in the case of this reference example , a thickness dimension T in the axial direction of a portion of the holder main body 26b that overlaps the contact portion 46 in the axial direction (the inner half in the radial direction of the holder main body 26b). ₄₆ is regulated as follows. That is, this thickness _{T 46,} the difference between the thickness dimension _{T 27a} of the mounting plate portion 27a of the _{(T 46 -T 27a),} slightly larger than the nut height _{H 32a} of the sensor mounting nut 32a and that _{(T 46 -T 27a> H 32a} ). In this manner, the contact portion 46 can be pressed against the cap bottom plate portion 19b in a state where the sensor unit 22b is assembled to the cap 18b.

In the case of this reference example , the holder-side engagement convex portion 41, at two positions separated in the circumferential direction of the portion corresponding to the contact portion 46 on the outer side surface in the axial direction of the holder body 26b. 41 is formed. And in the state which assembled | attached the said sensor unit 22b to the said cap 18b, each said holder side engaging convex part 41 and 41, and each cap side engaging recessed part 39, 39 formed in the said cap bottom board part 19b are used. Engaged.

According to the present reference example having the above-described configuration, the sensor unit 22b is assembled to the cap 18b, and the sensor 34 held by the holder body 26b is connected to the holder body 26b and the cap bottom plate portion. It is possible to prevent the pressure based on the contact pressure with 19b from being applied. In addition, since wear between the holder main body 26b and the sensor 34, which is generated based on the contact pressure, is reduced, a coating formed on the sensor 34 (of the holder main body 26b, the sensor 34 is covered from the outside in the axial direction). The thickness of the part) can also be reduced. Further, not only the engagement force between each of the holder side engagement convex portions 41, 41 and each of the cap side engagement concave portions 39, 39, but also the inner side surface in the axial direction of the cap bottom plate portion 19b, the contact portion 46, This frictional force can prevent the sensor unit 22b from rotating due to the tightening (rotating) torque of the bolt 29a. Therefore, it is possible to improve the durability against the tightening torque of the engaging portions of the holder-side engaging convex portions 41, 41 and the cap-side engaging concave portions 39, 39. About another structure and an effect, it is substantially the same as the case of the 1st example of the reference example mentioned above.

[Third example of reference example ]
6 to 8 show a third example of the reference example of the present invention. In the case of the sensor-equipped rolling bearing unit 1d of the present reference example , the cap-side engagement recesses 39, 39 of the first and second examples of the reference example described above are not formed in the cap bottom plate portion 19c constituting the cap 18c. . Instead, in the case of this reference example, the portion of the inner surface in the axial direction of the cap bottom plate portion 19c that faces the detected surface of the encoder 21 in the axial direction in the state where the cap 18c is assembled to the outer ring 4. Cap side engaging convex portions 48, 48 that are long in the radial direction and protrude inward in the axial direction are formed at two positions spaced apart in the circumferential direction. Such cap-side engagement convex portions 48, 48 are formed by pressing the cap bottom plate portion 19c, so that the cap-side engagement convex portions on the outer surface in the axial direction of the cap bottom plate portion 19c. 48 and the part matching 48 is formed in a state where it is recessed inward in the axial direction. In the case of the present embodiment, the each cap-side engaging protrusion 48, which corresponds to the caps-side engaging portion.

On the other hand, in the case of this reference example, the holder-side engagement convex portions 41, 41 of the first example and the second example of the reference example described above are formed on the holder body 26c of the sensor holder 25c constituting the sensor unit 22c. Absent. That is, in the case of this reference example , the axial outer end surface of the holder body 26c is a flat surface.

In the sensor unit 22c as described above, the holder main body 26c is placed between the cap-side engagement convex portions 48, 48, both sides in the circumferential direction of the holder main body 26c, and both sides in the circumferential direction. It arrange | positions in the state engaged with the circumferential direction side surface of each said cap side engaging convex part 48 and 48 which opposes the circumferential direction in the circumferential direction, and the whole surface of the axial direction outer end surface of the said holder main body 26c. The cap bottom plate portion 19c is brought into contact with the inner surface in the axial direction. In this state, the bolts 29a are supported and fixed to the cap 18c (cap body 37a). In the case of the present embodiment, the circumferential sides of the holder body 26c corresponds to a Holder side engaging portion.

Also in the case of this reference example as described above, when the bolt 29a is tightened, the circumferential side surfaces of the cap-side engagement convex portions 48, 48 and the circumferential side surfaces of the holder body 26c are circumferential. Since they are engaged in the direction, it is possible to prevent the position of the sensor unit 22c from being shifted due to the tightening (rotation) torque of the bolt 29a. About another structure and an effect, it is substantially the same as the case of the 1st example of the reference example mentioned above.

[Fourth Reference Example ]
9 to 11 show a fourth example of the reference example of the present invention. In the case of the rolling bearing unit with sensor 1e of the present reference example, the detected surface of the encoder 21 and the detected surface of the encoder 21 in the state where the cap 18d is assembled to the outer ring 4 among the axial inner surfaces of the cap bottom plate portion 19d constituting the cap 18d A cap-side engagement convex portion 48 that is long in the radial direction and protrudes inward in the axial direction is formed at one position in the circumferential direction of the portion facing the axial direction. That is, in the case of the present reference example , one of the cap side engagement convex portions 48 (48 on the left side in FIGS. 7 and 8) of the cap side engagement convex portions 48 of the third example of the reference example described above is omitted. ing.

In the case of this reference example , the axially outer side surface of the holder main body 26d of the sensor holder 25d constituting the sensor unit 22d is formed in the radially outer half as in the case of the second example of the reference example described above. The non-contact part 45, the contact part 46 formed in the radially inner half, and the non-contact part 45 and the contact part 46 are constituted by a continuous step part 47. In the case of this reference example , both the abutting portion 46 and the non-abutting portion 45 are flat surfaces. Therefore, in the case of this reference example, in the state where the sensor unit 22d is assembled to the cap 18d, only the contact portion 46 of the axially outer end surface of the holder body 26d is the cap bottom plate portion 19d. It is in contact with the inner surface in the axial direction. The dimensional relationship in the axial direction of the holder body 26d (the non-contact portion 45 and the contact portion 46) is the same as that in the second example of the reference example .

The sensor unit 22d as described above includes a holder main body 26d and a circumferential side surface (the right side surface in FIG. 10) that is forward of the tightening direction α of the bolt 29a among the circumferential side surfaces of the holder main body 26d. The circumferential side surface (left side surface in FIG. 10) of the cap side engaging convex portion 48 facing the circumferential side surface is disposed in a circumferentially engaged state, and the holder body 26d. The abutting portion 46 is abutted against the inner surface in the axial direction of the cap bottom plate portion 19c. In this state, the bolt 29a is supported and fixed to the cap 18d (cap body 37b). In the case of the present embodiment, of the circumferential side surfaces of the holder main body 26 d, the side of the front of the tightening direction alpha, corresponding to Holder side engaging portion.

Also in the case of this reference example as described above, when tightening the bolt 29a, of the circumferential side surfaces of the holder body 26d, the circumferential side surface that is forward of the tightening direction α and the circumferential direction Since the circumferential side surface of the cap side engaging convex portion 48 facing the side surface is engaged in the circumferential direction, the position of the sensor unit 22d is shifted by the tightening (rotating) torque of the bolt 29a. There is nothing. Other configurations and operational effects are substantially the same as those in the second and third examples of the reference example described above.

[ Example of Embodiment]
12 to 13 show an example of an embodiment of the present invention. In the case of the rolling bearing unit with sensor 1f of this example, the cap bottom plate portion 19e constituting the cap 18e penetrates in the axially central portion {a position not concentric with the rotation axis of the hub 5 (encoder 21)} in the axial direction. A nut fixing through hole 49 having a circular shape when viewed from the axial direction is formed.
Further, in the circumferential direction of a sensor holder 25e (mounting plate portion 27b) to be described later in a state where the sensor unit 22e is assembled to the cap 18e around the nut fixing through hole 49 in the cap bottom plate portion 19e. Rubber member through holes 50 and 50 penetrating in the axial direction are formed at two positions in the circumferential direction adjacent to both side surfaces.

Also in the case of this example, the sensor mounting nut 32b is a press-fit nut that penetrates in the axial direction as in the examples of the reference example described above. In the case of this example, the sensor mounting nut 32b is fixed by press-fitting a small diameter portion provided on the inner end surface in the axial direction into the through hole 49 for fixing the nut from the axially outer side of the cap bottom plate portion 19e. Yes. The structure of the sensor mounting nut 32b is substantially the same as that of a general press-fit nut. Further, the sensor mounting nut 32b may have a structure that does not penetrate in the axial direction, that is, a cap nut shape.

  In the case of this example, the circumferential direction of the portion of the inner surface in the axial direction of the cap bottom plate portion 19e facing the detected surface of the encoder 21 in the axial direction with the cap 18e assembled to the outer ring 4 The rubber cap side engaging convex portions 48a and 48a are vulcanized and bonded to two positions separated from each other in a state of being long in the radial direction and protruding inward in the axial direction. Each of the cap-side engaging convex portions 48a and 48a is made of the same rubber material as that of the seal member 38, and the respective radial outer end portions are continuous with the axial outer end portion of the seal member 38. .

In the case of this example, the sensor mounting nut 32b is covered with a nut cover 51 made of the same rubber material as the cap-side engaging protrusions 48a and 48a and the seal member 38. Specifically, the nut cover 51 covers the outer peripheral surface of the sensor mounting nut 32b and the axial outer end surface (including the axial outer end opening).
Such a nut cover 51 is formed in a bottomed cylindrical shape including a cylindrical portion 52 and a bottom plate portion 53 that closes the axially outer end opening of the cylindrical portion 52. Such a nut cover 51 is fixed to the outer surface in the axial direction of the cap bottom plate 19e and the sensor mounting nut 32b by vulcanization adhesion. In this way, the sensor mounting nut 32b is prevented from being exposed to the internal space 16 in which the encoder 21 is installed. In this way, even when foreign matter such as water enters from the threaded portion between the nut fixing through hole 49 and the bolt 29a, the foreign matter is prevented from entering the internal space 16.

Further, at two positions in the circumferential direction of the cylindrical portion 52 of the nut cover portion 51, one end portions of connecting arm portions 58 and 58 made of the same rubber material as the nut cover portion 51 are continuous. . Each of the connecting arm portions 58 and 58 has an inner end surface in the axial direction fixed to the outer surface in the axial direction of the cap bottom plate portion 19e by vulcanization adhesion. The other end of each of the connecting arm portions 58, 58 and the axially outer side surface of the radially inner end of each of the cap side engaging projections 48a, 48a are the through holes 50, 50 for the rubber member. It is continuous by the rubber material filled inside. That is, in the case of this example, the sealing member 38, the cap-side engaging convex portions 48a and 48a, the connecting arm portions 58 and 58, and the nut cover portion 51 are integrally formed of the same rubber material. Has been.
The seal member 38, the cap-side engagement convex portion 48a, and the nut cover portion 51 can be provided separately. At this time, the materials constituting these members may be the same or different from each other.

  The cap 18e having the above-described configuration uses a device composed of a pair of molds (upper mold and lower mold), and the sensor is mounted in a cavity defined between the molds. It can be made by pouring vulcanized molten rubber into the cavity in a state where the cap body 37c to which the nut 32b is fixed is disposed. When the cap 18e is manufactured in this way, it is released into a vulcanized male screw material (not shown) corresponding to the bolt 29a in advance over the entire width of the female screw portion 33b of the sensor mounting nut 32b. If the agent is applied and screwed, the molten rubber can be prevented from flowing into the inner diameter side of the sensor mounting nut 32b.

Further, in the present example, the thickness dimension _{T 26e} in the axial direction of the holder main body 26e of the sensor holder 25e of the sensor unit 22e, and a thickness _{T 27b} in the axial direction of the mounting plate portion 27b, formed equal to (T _26e = T _27b ). That is, in the case of this example, the entire sensor holder 25e is formed in a rectangular parallelepiped shape that is long in the radial direction.
A holder-side through hole 54 is formed at a position in the sensor holder 25e (mounting plate portion 27b) aligned with the nut fixing through hole 49. The holder-side through hole 54 includes a small diameter portion 55 formed near the outer end in the axial direction, a large diameter portion 56 formed inward in the axial direction from the small diameter portion 55, and the small diameter portion 55 and the large diameter. The unit 56 is composed of a continuous stepped portion 57.

  In the case of this example as described above, the holder main body 26e is disposed between the cap-side engagement convex portions 48a, 48a, both side surfaces in the circumferential direction of the holder main body 26e, and both side surfaces in the circumferential direction. It arrange | positions in the state engaged with the circumferential direction side surface of each said cap side engaging convex part 48a, 48a which opposes the circumferential direction in the circumferential direction. Then, the cap 18e is applied by the bolt 29a with the entire surface of the outer end surface in the axial direction of the sensor holder 25e (the holder main body 26e and the mounting plate portion 27b) being in contact with the inner surface in the axial direction of the cap bottom plate portion 19e. It is supported and fixed to the (cap body 37c). Specifically, in a state where the shaft portion of the bolt 29a is inserted into the small diameter portion 55 of the holder-side through hole 54, the male screw portion 42 of the bolt 29a is fixed to the cap bottom plate portion 19d. The cap 18e (cap main body 37c) is tightened by tightening the bolt 29a in a state where the head portion of the bolt 29a is in contact with the stepped portion 57. It is supported and fixed against.

As in the case of the fourth example of the reference example described above, the sensor holder 25e is assembled to the sensor holder 25e with the sensor holder 25e out of the cap side engaging projections 48a, 48a. The cap side engaging convex part 48a which is the rear (left side in FIG. 13) in the tightening direction α of the bolt 29a can be omitted.
Further, in addition to the structure of this example, as in the first example of the reference example described above, the holder side engaging convex portions 41 and 41 (FIG. 1, FIG. 1) are formed on the outer side surface of the sensor holder 25e (holder body 26e) in the axial direction. 2), and cap-side engagement recesses 39, 39 can be formed on the inner surface in the axial direction of the cap bottom plate portion 19e.
Further, the axially outer surface of the sensor holder 25e (holder body 26e), as in the second example of the reference example described above, is a non-contact portion 45 (see FIGS. 4 and 5) formed on the radially outer half. ), And the contact portion 46 formed in the radially inner half, and the non-contact portion 45 and the contact portion 46 can be constituted by a continuous step portion 47.

In the case of this example having the above-described configuration, since the sensor mounting nut 32b is provided on the outer side in the axial direction of the cap bottom plate portion 19e, the fixing strength of the sensor unit 22e with respect to the cap 18e. Can be improved. Other configurations and operational effects are substantially the same as those in the second and third examples of the reference example described above.

When practicing the present invention, each example of the reference example described above and one example of the embodiment can be implemented in appropriate combination.

DESCRIPTION OF SYMBOLS 1, 1a, 1c, 1d, 1e, 1f Rolling bearing unit 2 Rolling bearing unit 3 Rotational speed detection device 4 Outer ring 5 Hub 6 Rolling element 7a, 7b Outer ring track 8 Static side flange 9 Knuckle 10 Hub body 11 Inner ring 12 Caulking part 13a 13b Inner ring raceway 14 Rotating flange 15 Cage 16 Internal space 17 Seal ring 18, 18a, 18b, 18c, 18d, 18e Cap 19, 19a, 19b, 19c, 19d, 19e Cap bottom plate 20, 20a Cap cylinder 21 Encoder 22, 22a, 22b, 22c, 22d, 22e Sensor unit 23 Support ring 24 Encoder body 25, 25a, 25b, 25c, 25d, 25e Sensor holder 26, 26a, 26b, 26c, 26d, 26e Holder body 27, 27a, 27b mounting Plate part 28 Sensor insertion hole 29, 29a Bolt 30 Screw hole 31 Nut fixing recess 32, 32a, 32b Sensor mounting nut 33, 33a, 33b Female thread part 34 Sensor 35 Fitting cylinder part 36 Ring part 37, 37a, 37b 37c Cap body 38 Seal member 39 Cap side engaging recess 40 Holder side through hole 41 Holder side engaging convex portion 42 Male screw portion 43 Cap side engaging convex portion 44 Holder side engaging concave portion 45 Non-contact portion 46 Contact portion 47 Stepped portion 48, 48a Cap side engaging convex portion 49 Nut fixing through hole 50 Rubber member through hole 51 Nut cover portion 52 Cylindrical portion 53 Bottom plate portion 54 Holder side through hole 55 Small diameter portion 56 Large diameter portion 57 Step portion 58 Connecting arms

Claims (3)

An outer ring having a double-row outer ring raceway on the inner peripheral surface and not rotating during use;
The outer ring has a double-row inner ring raceway and is supported concentrically with the outer ring on the inner diameter side of the outer ring, and on the part of the outer circumferential surface that protrudes outward in the axial direction from the axial outer end of the outer ring. A hub provided with a rotation side flange for supporting the wheel;
Between the both outer ring raceways and the both inner ring raceways, a plurality of rolling elements provided so as to be freely rollable for each row,
An annular encoder that is formed by alternately changing the magnetic properties of the inner surface in the axial direction with respect to the circumferential direction, and is supported concentrically with the hub at the inner end in the axial direction of the hub;
A cap that is attached to the axially inner end of the outer ring and closes the axially inner end opening of the outer ring;
A sensor that changes an output signal in response to a change in the characteristics of the detected surface of the encoder while facing the detected surface of the encoder in the axial direction, and is supported by the cap while holding the sensor. A sensor unit comprising a sensor holder;
A rolling bearing unit with a sensor comprising:
The cap includes a cap body, a sensor mounting nut, and a seal member.
The cap body is made of a non-magnetic metal plate and has a bottomed cylindrical shape. The cap body is fitted and fixed to the inner end of the outer ring in the axial direction. And a cap bottom plate portion that closes the end opening,
The sensor mounting nut is provided on the cap bottom plate,
The seal member is integrally formed of rubber, and is fixed to the outer peripheral surface of the cap cylindrical portion over the entire circumference by vulcanization adhesion.
The sensor unit abuts at least a part of an axially outer surface of a holder main body, which is a part of the sensor holder holding the sensor, in contact with an axially inner side surface of the cap bottom plate part, and the holder main body And a cap side engaging portion made of rubber integrally formed with the seal member and vulcanized and bonded to the inner side surface in the axial direction of the cap bottom plate portion; Are coupled and fixed to the cap by a bolt screwed to the sensor mounting nut in a state of being engaged in the circumferential direction ,
An axially outer surface of the sensor holder is overlapped with the sensor in the axial direction, and a non-contact portion that does not contact the axial inner surface of the cap bottom plate portion, and the holder-side engagement portion are formed, The contact portion is pressed against the cap bottom plate portion, and the non-contact portion and the contact portion are configured to be a continuous step portion.
This is a rolling bearing unit with sensor. The sensor mounting nut is directly fixed to the outside of the cap bottom plate portion in the axial direction by press-fitting and fixing the axial inner end portion to a nut fixing through hole formed in the cap bottom plate portion,
The outer peripheral surface and the axially outer end face of the sensor mounting nut, the sealing member and integrally formed with the cap side engaging portion, is covered by a rubber nut covering portion, according to claim 1 Rolling bearing unit with sensor. An outer ring having a double-row outer ring raceway on the inner peripheral surface and not rotating during use;
The outer ring has a double-row inner ring raceway and is supported concentrically with the outer ring on the inner diameter side of the outer ring, and on the part of the outer circumferential surface that protrudes outward in the axial direction from the axial outer end of the outer ring. A hub provided with a rotation side flange for supporting the wheel;
Between the both outer ring raceways and the both inner ring raceways, a plurality of rolling elements provided so as to be freely rollable for each row,
An annular encoder that is formed by alternately changing the magnetic properties of the inner surface in the axial direction with respect to the circumferential direction, and is supported concentrically with the hub at the inner end in the axial direction of the hub;
A cap that is attached to the axially inner end of the outer ring and closes the axially inner end opening of the outer ring;
A sensor that changes an output signal in response to a change in the characteristics of the detected surface of the encoder while facing the detected surface of the encoder in the axial direction, and is supported by the cap while holding the sensor. A sensor unit comprising a sensor holder;
A rolling bearing unit with a sensor comprising:
The cap includes a cap body, a sensor mounting nut, and a seal member.
The cap body is made of a non-magnetic metal plate and has a bottomed cylindrical shape. The cap body is fitted and fixed to the inner end of the outer ring in the axial direction. And a cap bottom plate portion that closes the end opening,
The sensor mounting nut is directly fixed to the outside of the cap bottom plate portion in the axial direction by press-fitting and fixing the axial inner end portion to a nut fixing through hole formed in the cap bottom plate portion,
The seal member is integrally formed of rubber, and is fixed to the outer peripheral surface of the cap cylindrical portion over the entire circumference by vulcanization adhesion.
The sensor unit abuts at least a part of an axially outer surface of a holder main body, which is a part of the sensor holder holding the sensor, in contact with an axially inner side surface of the cap bottom plate part, and the holder main body And a cap side engaging portion made of rubber integrally formed with the seal member and vulcanized and bonded to the inner side surface in the axial direction of the cap bottom plate portion; Are coupled and fixed to the cap by a bolt screwed to the sensor mounting nut in a state of being engaged in the circumferential direction ,
The outer peripheral surface and the axially outer end surface of the sensor mounting nut are covered with a rubber nut cover portion formed integrally with the seal member and the cap side engaging portion.
This is a rolling bearing unit with sensor.

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