JP6500345B2 - Sensor and rolling bearing unit - Google Patents

Description

  The present invention relates to an improvement of a sensor-equipped rolling bearing unit, which rotatably supports a vehicle wheel (a driven wheel) with respect to a suspension system and includes, for example, a sensor for detecting a rotational speed of the wheel.

  As a rolling bearing unit with a rotational speed detecting device for rotatably supporting a wheel on a suspension system of an automobile and detecting the rotational speed of the wheel, various structures have been known conventionally. In any of the structures, the detection portion of the sensor supported and fixed in the non-rotational portion is opposed to the detected surface of the encoder supported and fixed in a part of the hub rotating with the wheel. And based on the frequency or period of the output signal of this sensor which changes with rotation of the encoder, it is constituted so that the revolving speed of the wheel which rotates with this encoder may be calculated.

  In order to prevent damage to the encoder that constitutes such a rolling bearing unit with a rotational speed detection device due to adhesion of muddy water, dust or the like, or foreign matter such as magnetic powder adheres to this encoder and this encoder is used In order to prevent the reliability of the rotational speed detection from being impaired, a structure in which the encoder is separated from the outside by a cap made of a nonmagnetic plate is conventionally known, as described in Patent Document 1 and the like. FIG. 14 shows an example of the structure described in Patent Document 1 among them.

  The rolling bearing unit 1 with 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, 6. Among them, the outer ring 4 has double rows of outer ring raceways 7a and 7b on the inner circumferential surface and a stationary flange 8 on the outer circumferential surface. Then, in use, the outer ring 4 is supported by the knuckles 9 constituting the suspension device and does not rotate. Further, the hub 5 is formed by coupling and fixing the hub body 10 and the inner ring 11 by the caulking portion 12, and has double rows of inner ring raceways 13a and 13b on the outer peripheral surface. It is supported concentrically with the outer ring 4. Further, the axially outer end portion of the hub body 10 (the outer side in the axial direction means a side which is outboard in the width direction of the vehicle body in a state of being assembled to a suspension device. In the entire specification and claims) In the same manner, the rotation-side flange 14 for supporting the wheel is provided at a portion of the outer ring 4 that protrudes axially outward from the axial outer end opening. The rolling elements 6, 6 are held between the outer ring raceways 7a, 7b and the inner ring raceways 13a, 13b by a plurality of cages 15, 15 in each row. , It is provided free to roll. Further, both axial ends of the internal space 16 in which the rolling elements 6 and 6 are installed are closed by the seal ring 17 and the cap 18.

  The cap 18 is made of a nonmagnetic plate such as an aluminum alloy plate or a nonmagnetic metal plate such as an austenitic stainless steel plate. Such a cap 18 is provided with a cap bottom plate portion 19 and a cap cylindrical portion 20 bent at a right angle outward in the axial direction from the outer peripheral edge of the cap bottom plate portion 19. In the structure of FIG. 14, since the rolling bearing unit 2 for a driven wheel (rear wheel of FF car, front wheel of FR car, MR car) is targeted, the cap bottom plate portion 19 is an inner end in the axial direction of the outer ring 4. The entire opening (inside with respect to the axial direction means the side closer to the center of the vehicle in the width direction when assembled to the suspension device. Same as in the present specification and claims) There is.

  On the other hand, the rotational speed detection device 3 includes an encoder 21 and a sensor unit 22. Among them, the encoder 21 is composed of a support ring 23 in which the magnetic metal plate is L-shaped in cross section and the whole is annular, and an encoder main body 24 made of permanent magnet such as rubber magnet. The encoder main body 24 is magnetized in the axial direction, and alternately changes the magnetization direction in the circumferential direction with respect to the circumferential direction at equal intervals, so that the S pole and the N pole are formed on the inner surface in the axial direction. , Alternately and equally spaced. The to-be-detected surface of such an encoder main body 24 is closely opposed to the axial direction outer surface (inner surface) of the cap 18 via a minute gap. In other words, the cap 18 is pushed into the axially inner end portion of the outer ring 4 so that the axially outer surface of the cap bottom plate 19 approaches and faces the detected surface of the encoder main 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 magnetic resistance element in the detection portion, and changes the output signal according to the characteristic change of the detection surface of the encoder main body 24. . The sensor holder 25 is formed by injection molding synthetic resin, and includes a holder main body 26 holding the sensor 34 and a mounting plate portion 27 for fixing 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 main body 26 is inserted into the sensor insertion hole 28 formed in the knuckle 9; The knuckle 9 is fixed to the knuckle 9 by screwing with a female screw portion of a bottomed screw hole 30 formed in the knuckle 9.

As described above, in a state of being supported and fixed to the knuckle 9, the detection portion of the sensor 34 held by the sensor holder 25 is in contact with the axial inner surface (outer surface) of the cap bottom plate portion 19. . In this state, the detection portion faces the detected surface of the encoder main 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 this rotational speed, the rotational speed of the wheel fixed to the hub 5 can be determined based on either.

  In the case of the conventional structure shown in FIG. 14 as described above, the encoder main body 24 made of a permanent magnet and the external space are separated by a cap 18 made of a nonmagnetic plate. Foreign matter such as magnetic powder can be prevented from adhering. Therefore, it is possible to maintain the reliability of the rotational speed detection using the encoder main body 24 by keeping the detected surface clean. However, from the viewpoint of further improving the reliability of the rotational speed detection, there is room for improvement in the following points.

In order to change the output signal of the sensor 34 sufficiently in accordance with the rotation of the encoder body 24, it is necessary to make the positioning accuracy of the sensor 34 with respect to the encoder body 24 sufficiently high. On the other hand, in the case of the conventional structure, since the sensor 34 is supported and fixed to the knuckle 9, and there are many members existing between the encoder main body 24 and the sensor 34 , the positioning accuracy is secured. It is difficult to do. In particular, the positioning accuracy between the outer ring 4 and the knuckle 9 can not be said to be sufficiently high from the viewpoint of rotational speed detection, which is disadvantageous from the viewpoint of securing the variation of 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 The distance (air gap) between the sensor main body 24 and the detected surface of the encoder main body 24 tends to be large, which may be disadvantageous in terms of securing the variation of 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 recess 31 formed in the radial direction central portion (a position concentric with the rotation axis of the hub 5) of the axial direction inner side surface of the cap bottom plate 19a constituting the bottomed cylindrical cap 18a. The sensor mounting nut 32 is press-fitted and fixed. Further, the sensor held by the sensor holder 25 is screwed by screwing the male screw portion of the bolt with the female screw portion 33 of the sensor mounting nut 32 through a mounting plate portion (not shown) constituting the sensor holder 25. 34 is fixed to the cap 18a. In the case of the structure described in such Patent Document 2, it is possible to solve the problems of the structure described in Patent Document 1 described above. However, in the case of the structure described in Patent Document 2, when the bolt is screwed into the sensor attachment nut 32, the sensor holder 25 is rotated by the tightening (rotational) torque of the bolt. It may be difficult to regulate the positional relationship with the sensor 34 . The magnetic detection element used for the sensor 34 has a magnetic detection direction. For this reason, when the sensor holder 25 is rotated by the tightening (rotation) torque of the bolt when the sensor attachment nut 32 is not disposed concentrically with the rotation axis of the hub 5 (encoder 21), the encoder 21 is 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, in the case of a structure in which the sensor holder 25 may be rotated by the tightening (rotation) torque of the bolt, as in the structure described in the above-mentioned Patent Document 2, Accordingly, in order to prevent the detection surface of the encoder 21 (the encoder main body 24) from being deviated from the detection directionality of the magnetic detection element, the installation position of the sensor attachment nut 32 is set to the hub 5 (the encoder 21). It is necessary to limit the position to be concentric with the rotation axis of For this reason, the degree of freedom of installation of the sensor attachment nut 32 and the degree of freedom of design of the sensor unit become low.

JP 2000-249138 A JP, 2011-196425, A

  In view of the above-described circumstances, the present invention prevents the sensor unit from rotating by the tightening torque of the bolt when the sensor unit is fixed to the cap, thereby preventing the sensor and the encoder from being rotated. It is invented to realize the structure of a sensor-equipped rolling bearing unit capable of restricting the positional relationship.

The rolling bearing unit with a sensor according to 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 circumferential surface and does not rotate even in use.
The hub has a plurality of rows of inner ring raceways on the outer peripheral surface, and a rotation side flange for supporting the wheel on a portion of the outer peripheral surface which 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.
The rolling elements are provided between the two outer ring raceways and the two inner ring races so as to be rollable in a plurality of rows.
The encoder is formed by alternately changing the magnetic properties of the axially inner side in the circumferential direction, and is supported concentrically with the hub at the axially inner end of the hub.
The cap is attached to the axially inner end portion of the outer ring, and closes the axially inner end opening portion of the outer ring.
The sensor unit comprises a sensor and a sensor holder.
Among the sensors, the sensor changes the output signal in response to the change in the characteristic of the surface to be detected of the encoder while facing the surface to be detected of the encoder.
The sensor holder holds the sensor and is supported at a portion of the cap that faces the encoder in the axial direction.

In particular, in the case of the sensor-equipped rolling bearing unit of the present invention, the cap includes a cap body and a sensor mounting nut.
Among them, the cap body is made of a nonmagnetic metal plate and made of austenitic stainless steel plate in a bottomed cylindrical shape, and a cap cylindrical portion internally fitted and fixed to the axially inner end portion of the outer ring, and this cap And a cap bottom plate for closing the axial inner end opening of the cylindrical portion.
The sensor mounting nut is integrally or separately provided at a position radially offset from a radial center portion concentric with the rotation shaft of the hub in the cap bottom plate portion.
The sensor unit causes an axial outer surface of at least a portion of a holder main body which is a portion holding the sensor in the sensor holder to abut on an axial inner surface of the cap bottom plate portion, and the sensor holder The cap bottom plate portion is penetrated to two holder side engaging portions which are convex portions or concave portions formed on the axially outer side surface of the housing in the circumferential direction at a distance from each other and the axially inner side surface of the cap bottom plate portion The respective holder side engaging portions and the respective cap side engaging portions are engaged by concavo-convex engagement with two cap side engaging portions which are concave portions or convex portions which are formed separately in the circumferential direction in a state where The joint portion is engaged with and fixed to the cap by a bolt screwed to the sensor attachment nut in a state of being engaged in the circumferential direction.

In the case of practicing the present invention, preferably, a portion of the axially outer surface of the sensor holder that overlaps the sensor in the axial direction is not in contact with the axially inner surface of the cap bottom plate (a gap is provided). Like. Specifically, as in the invention described in claim 2, the axial outer surface of the sensor holder is axially superimposed on the sensor, and the sensor holder is not in contact with the axial inner surface of the cap bottom plate. An abutting portion, each of the holder side engaging portions are formed, and the abutting portion is pressed against the cap bottom plate portion, and the non-abutted portion and the abutting portion are formed by a continuous stepped portion There is.

Although it is out of the technical scope of the present invention, the side surface in the circumferential direction of the holder main body instead of using the holder side engaging portion as the convex portion or the concave portion formed on the axial outer surface of the sensor holder It can also be configured by In this case, the cap-side engaging portion is constituted by a convex portion formed on the axial inner surface of the cap bottom plate portion , or the cap-side engaging portion is formed in the axial direction of the cap bottom plate portion It comprises by the member fixed to the inner surface.

According to the sensor-equipped rolling bearing unit 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 (rotational) torque of the bolt. To prevent the positional relationship between the sensor and the encoder.
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 axially inner side surface of the cap bottom plate portion of the cap The bolt for fixing the sensor unit to the cap can be tightened in the state of being engaged with the cap. Therefore, based on the tightening (rotation) torque of the bolt, it is possible to prevent the sensor unit from rotating (corolling). As a result, since the positional relationship between the encoder and the sensor can be regulated, it is not necessary to install the sensor mounting nut concentrically with the rotation axis of the hub (encoder). Therefore, according to the present invention, it is possible to improve the degree of freedom of installation of the sensor mounting nut and the degree of freedom of design of the sensor unit.
The sensor unit may be mounted on the cap if the axially outer surface of the sensor holder is not brought into contact with the axially inner side surface of the cap bottom plate in a portion overlapping in the axial direction with the sensor. In the assembled state, it is possible to prevent the pressure based on 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 embodiment of this invention. Similarly, a view showing the assembled state of the sensor unit as viewed from the inside in the axial direction. The figure corresponded to the A section of FIG. 1 which shows one 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 embodiment of this invention. Similarly, a view similar to FIG. The figure similar to FIG. 1 which shows the 1st example of the reference example of this invention. Similarly, a view similar to FIG. Similarly, the fragmentary sectional view of the cap equivalent to XX of FIG. The figure similar to FIG. 1 which shows the 2nd example of the reference example of this invention. Similarly, a view similar to FIG. Similarly, the fragmentary sectional view of the cap equivalent to YY of FIG. The figure similar to FIG. 1 which shows the 3rd example of the reference example of this invention. Similarly, a view similar to FIG. The half 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 conventional structure.

First Example of Embodiment
1 to 3 show a first example of the embodiment of the present invention. The feature of this embodiment lies in that the structure of the cap 18b for closing the axially inner end opening of the outer ring 4 is devised. The configuration and effects of the other parts are basically the same as those of the above-described conventional structure, and therefore redundant illustration and description will be omitted or simplified. The explanation will focus on the parts that were not explained.

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

  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 It is done. On the other hand, the inner ring 11 and the rolling elements 6 constituting the hub 5 are made of high carbon chromium bearing steel such as SUJ 2 and, for example, are subjected to hardening treatment by slip hardening. The rolling elements 6 used are not limited to the balls as shown in FIG. When the rolling bearing unit with sensor 1a of this embodiment is used for a heavy vehicle, a tapered roller can be used as the rolling element 6.

  An encoder 21 is externally fitted and fixed (press-fit and fixed) to an axially inner end (a right end in FIG. 1) of the outer peripheral surface of the inner ring 11 constituting the hub 5. The encoder 21 is configured of a support ring 23 and an encoder body 24. Among them, the support ring 23 is formed by pressing a ferritic stainless steel plate such as SUS 430 or a cold-rolled steel plate of a magnetic material such as SPCC subjected to anti-corrosion treatment to make the entire L-shaped cross section. It is annularly formed. Further, the support ring 23 is a circle provided in a state of being bent radially outward from the cylindrical fitting cylindrical portion 35 and the axially inner end portion (right end portion in FIG. 1) of the fitting cylindrical portion 35 It is comprised from the ring part 36 and. Further, the encoder main body 24 is formed in an annular shape as a whole 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 magnetization direction is Are alternately and equally spaced in the circumferential direction. Then, in a state where such an encoder main body 24 is attached to the axial inner side surface of the circular ring portion 36, the axial inner side surface (detected surface) of the encoder main body 24 It is located radially outward of the crimped portion 12 formed at the end.

The cap 18b mounted on the axially inner end portion of the outer ring 4 includes a metal cap body 37, a sensor attachment nut 32a, and a seal member 38.
Among them, the cap main body 37 has a cylindrical shape with a bottom at its bottom by pressing a nonmagnetic metal plate such as an austenitic stainless steel plate or an aluminum alloy plate, etc. Is formed. Such a cap body 37 comprises a cap cylindrical portion 20a and a cap bottom plate portion 19b for closing the axial inner end opening of the cap cylindrical portion 20a.

The axially outer half outer peripheral surface 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 axially inner half portion of the cap cylindrical portion 20a is formed in a tapered surface shape which is inclined in a direction in which the outer diameter dimension decreases inward in the axial direction.
Further, in the cap bottom plate portion 19b, pressing is performed at two circumferentially spaced positions inward in the radial direction of a portion of the cap bottom plate portion 19b that faces in the axial direction the detected surface of the encoder 21 (encoder main body 24). The inner surface formed by the above is formed with a partially concave spherical surface (hemispherical surface) cap side engagement concave portion 39, 39. In the case of this example, these cap side engagement recesses 39, 39 correspond to the cap side engagement portion in the claims. Although the number and shape of the respective cap-side engagement recesses 39, 39 are not limited to the case of the present example, since austenitic stainless steel is easily magnetized by pressing, the cap-side engagement recess 39, In order to separate 39 and the sensor 34 as much as possible, it is preferable to provide an even number. Further, forming the cap-side engagement concave portions 39 and 39 as far apart as possible reduces the influence on sensing when the cap-side engagement concave portions 39 and 39 are magnetized by press working. It is preferable from the viewpoint.
Further, a nut fixing recess 31 having a circular shape as viewed in the axial direction is formed at a radial center portion of the cap bottom plate 19b (a position not concentric with the rotation axis of the hub 5 (encoder 21)). There is. The nut fixing recess 31 can be formed at an appropriate position including the radial direction central portion of the cap bottom plate 19b {a position concentric with the rotation axis of the hub 5 (encoder 21)}.

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

  The seal member 38 is a nonmagnetic material and is made of, for example, various rubbers such as acrylonitrile butadiene rubber (NBR) having a hardness of HS 60 to 75, natural rubber, styrene butadiene rubber, urethane rubber, silicone rubber, fluorocarbon rubber, acrylic rubber, etc. It is integrally formed and is bonded by vulcanization to the cap body 37. Specifically, the seal member 38 has an annular shape, and is fixed by vulcanization bonding all around the outer peripheral surface of the axially inner half portion of the cap cylindrical portion 20a. The outer diameter dimension of the seal member 38 in the free state (the state shown in FIG. 1) in the state (free state) fixed to the cap cylindrical portion 20a in this manner is the inner peripheral surface of the axially inner end portion of the outer ring 4 Larger than the inner diameter dimension of.

  The cap 18b having the above configuration uses an apparatus comprising a pair of molds (upper mold and lower mold), and for mounting the sensor in a cavity defined between the two molds. With the cap main body 37 to which the nut 32a is fixed, the molten molten rubber can be poured into this cavity.

  The cap 18b having the above-mentioned configuration is directly fitted to the outer ring 4, the outer peripheral surface of the axially outer half of the cap cylindrical portion 20a, and the inner peripheral surface of the axially inner end of the outer ring 4 (metal fitting Assembled). Further, in such an assembled state, the seal member 38 is formed between the axially inner half portion outer peripheral surface of the cap cylindrical portion 20 a and the axially inner end portion inner peripheral surface of the outer ring 4 in the radial direction. It is pinched in the compressed state. In this state, a portion of the axially outer surface of the cap bottom plate 19b facing the surface to be detected of the encoder 21 has a predetermined axial gap (air gap) with respect to the surface to be detected. And close proximity.

  Further, in the case of this 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. The sensor 34 is a sensor in which a magnetic detection element such as a Hall element or a magnetoresistive element is installed in the detection unit, and changes the output signal according to the characteristic change of the detection target surface of the encoder 21. The sensor holder 25a is formed by injection molding of synthetic resin such as polyamide resin, and is substantially L-shaped in cross section, and includes a mounting plate portion 27a and a holder main body 26a.

  Among these, the mounting plate portion 27a is for fixing the holder main body 26a to the cap 18b, and has a rectangular shape when viewed from inside in the axial direction. Such an attachment plate portion 27a is integrally formed on the base half portion (axially inner half portion) of the holder main body 26a, and the holder side through hole 40 is formed at a position aligned with the nut fixing recess 31. It is done.

The holder main body 26a holds the sensor 34 inside, and is formed in a substantially square rectangular parallelepiped shape when viewed from inside 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 (T _26a -T _27a ) is the height of a portion of the sensor attachment nut 32a that protrudes axially inward from the axial inner surface of the cap bottom plate portion 19b, is the same as the nut height H _32a ? Slightly larger ( _T26a - _T27a = _H32a , or _T26a - _T27a > _H32a ). In addition, a state in which axial outward projection is made at two positions separated in the circumferential direction of the radially inner portion of the axially outer surface of the holder main body 26a with respect to the portion overlapping the sensor 34 in the axial direction. The holder side engaging convex parts 41 and 41 whose outer surface is a partial convex spherical surface (hemispherical surface) are formed. In the case of this example, each of the holder side engaging convex portions 41, 41 corresponds to the holder side engaging portion described in the claims. Such a holder main body 26a is disposed at a portion axially opposed to the encoder 21 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 respective holder side engagement convex portions 41, 41 formed on the axial outer surface of the holder main body 26a with the respective cap side engagement concave portions 39, 39 ) And with the entire axial outer surface of the holder main body 26a in contact with the axial inner surface of the cap bottom plate 19b, the cap 29b (cap main body 37) is fixed by the bolt 29a. It is supported and fixed. Specifically, in a state where the shaft portion of the bolt 29a is inserted into the holder side through hole 40, the female screw portion 33a of the sensor attachment nut 32a in which the male screw portion 42 of the bolt 29a is fixed to the cap bottom plate 19b. By screwing the bolt 29a in a state in which the axial outer 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. The cap 18 b (cap body 37) is supported and fixed. In the case of the present example, when the bolt 29a is tightened in this manner, the holder side engaging convex portions 41, 41 and the cap side engaging concave portions 39, 39 engage with each other in the circumferential direction. There is no possibility that the position of the sensor unit 22a is shifted by the tightening (rotation) torque of the bolt 29a.

  In addition, in the case of this example, while forming a recessed part (cap side engagement recessed part 39, 39) in the cap bottom plate part 19b which comprises the said cap 18b, the axial direction outer surface of the holder main body 26a which comprises the said sensor holder 25a. Although the convex part (holder side engagement convex part 41, 41) is formed, it is possible to form the concave part and the convex part in reverse. That is, as shown in FIG. 3, while forming a convex part (cap side engagement convex part 43) in the cap bottom plate part 19b which comprises the said cap 18b, a concave part (holder is comprised in the holder main body 26a which comprises the said sensor holder 25a. Side engagement recesses 44) can also be formed. Moreover, the shape of such a recessed part and a convex part can employ | adopt various shapes engageable to a circumferential direction.

  Also in the case of this example having the above configuration, the wheel fixed to the hub 5 can be rotatably supported by the suspension device supporting the outer ring 4. Further, when the encoder 21 is rotated together with the hub 5 along with the rotation of the wheel, the vicinity of the detection portion of the sensor 34 opposed to the detection surface of the encoder 21 via the cap bottom plate portion 19b The N pole and the S pole which exist in the to-be-detected surface 21 pass alternately. As a result, the direction of the magnetic flux flowing in the magnetic detection element constituting the sensor 34 changes alternately, and the characteristics of the magnetic detection element change alternately. Since the frequency at which the characteristics of the magnetic detection element change 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).

In particular, in the case of this example, when the bolt 29a for fixing the sensor unit 22a to the cap 18b is tightened, the sensor unit 22a is rotated (accompanied) by the tightening (rotation) torque of the bolt 29a. It is possible to restrict the positional relationship between the sensor 34 and the encoder 21 by preventing the problem.
That is, in the case of this example, the axial direction of each of the holder side engaging convex portions 41, 41 formed on the axially outer side surface of the holder main body 26a constituting the sensor unit 22a, and the cap bottom plate 19b of the cap 18b. The bolt 29a can be tightened to the sensor attachment nut 32a in a state in which the respective cap side engagement recesses 39, 39 formed on the inner side face are engaged in the circumferential direction. For this reason, 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 restricted.

  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 attachment nut 32a is the hub 5 (encoder 21). It is not limited to the position concentric with the axis of rotation of Therefore, the degree of freedom of installation of the sensor attachment nut 32 and the degree of freedom of design of the sensor unit 22a can be improved.

  Further, the axially outer half outer peripheral surface of the cap cylindrical portion 20 a of the cap body 37 is directly metal-fitted to the axially inner end inner peripheral surface of the outer ring 4. Therefore, even when the use is continued, it is possible to prevent the occurrence of a gap or the like in the fitting portion. Further, the seal member 38 is held in a compressed state between the axially inner half portion outer peripheral surface of the cap cylindrical portion 20 a and the axially inner end portion inner peripheral surface of the outer ring 4. Therefore, it is possible to prevent foreign matter such as water from invading the fitting portion. Therefore, according to the present embodiment, the sealing performance by the cap 18b can be sufficiently secured.

  Further, the sensor unit 22a is directly fixed to the cap 18b. For this reason, compared with the structure described in patent document 1 mentioned above, the member which exists between the said encoder 21 and the said sensor 34 can be decreased. As a result, the positioning accuracy between the encoder 21 and the sensor 34 can be made sufficiently high. Therefore, according to the present embodiment, the reliability of the rotational speed detection can be improved. Further, in the case of the present embodiment, the sensor unit 22 a can be supported relative to the outer ring 4 only by fixing (press-fitting) the cap 18 b to the axially inner end portion of the outer ring 4. The assembly process can be simplified. Moreover, since the processing to knuckles becomes unnecessary, processing cost can also be reduced.

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

The non-contacting portion 45 is formed of a radially outer half portion including a portion of the axially outer surface of the holder main body 26 b that overlaps the sensor 34 in the axial direction. Such a non-contacting portion 45 does not contact the axially inner side surface 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 example, the thickness dimension T in the axial direction of the portion (the radially outer half of the holder main body 26b) of the holder main body 26b that is overlapped in the axial direction with the non-contacting portion 45. ₄₅ is regulated as follows. 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 Of the sensor mounting nut 32a is smaller than the height H _{32a of} the nut projecting inward in the axial direction from the axial inner surface of the cap bottom plate 19b (T _45). -T _27a <H _32a ). In this manner, in the state where the sensor unit 22b is assembled to the cap 18b, a gap is present between the non-contacting portion 45 and the axially inner side surface of the cap bottom plate 19b.

The contact portion 46 is configured by a radially inner portion of the non-contact portion 45 in the axial outer surface of the holder main body 26 b. Further, the contact portion 46 is pressed against the axially inner side surface 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 the present embodiment, the thickness dimension T ₄₆ in the axial direction of the portion (the radially inner half portion of the holder main body 26b) of the holder main body 26b that overlaps in the axial direction with the contact portion _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 (T ₄₆ −T _{27 a} > H _{32 a} ). Thus, in the state where the sensor unit 22b is assembled to the cap 18b, the contact portion 46 is pressed against the cap bottom plate 19b.

  In the case of this embodiment, the holder side engagement convex portions 41, 41 are provided at two circumferentially spaced positions of the portion corresponding to the contact portion 46 in the axial outer surface of the holder main body 26b. Form. Then, in a state where the sensor unit 22b is assembled to the cap 18b, the respective holder side engaging convex portions 41, 41 and the respective cap side engaging concave portions 39, 39 formed in the cap bottom plate portion 19b It is engaged.

  According to this example having the above-mentioned configuration, the sensor main body 26b and the cap bottom plate portion 19b are provided to the sensor 34 held by the holder main body 26b in a state where the sensor unit 22b is assembled to the cap 18b. It is possible to prevent the application of pressure based on the contact pressure with the Further, since wear between the holder main body 26b and the sensor 34 generated based on the contact pressure is reduced, the film formed on the sensor 34 (of the holder main body 26b is covered from the outside in the axial direction Can be made thinner. Furthermore, not only the engaging force between the holder side engaging convex portions 41, 41 and the cap side engaging concave portions 39, 39, but also the axial inner surface of the cap bottom plate portion 19b and the abutting portion 46 By the frictional force of the above, it is possible to prevent the sensor unit 22b from rotating due to the tightening (rotation) torque of the bolt 29a. For this reason, it is possible to improve the durability against the tightening torque of the engaging portion between the holder side engaging convex portions 41 and the cap side engaging concave portions 39 and 39. The other configurations and effects are substantially the same as in the first example of the embodiment described above.

[ First example of reference example ]
6-8 show a first 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 engaging concave portions 39, 39 of the first and second examples of the embodiment described above are formed in the cap bottom plate portion 19c constituting the cap 18c. Absent. Instead, in the case of the present embodiment, of the axially inner side surface of the cap bottom plate portion 19c, a portion of the axially opposite surface of the encoder 21 facing the detected surface in a state where the cap 18c is assembled to the outer ring 4. At two circumferentially spaced positions, cap-side engaging convex portions 48, 48 which are long in the radial direction and project inward in the axial direction are formed. Each of the cap side engagement convex portions 48, 48 is formed by pressing the cap bottom plate portion 19c, whereby each of the cap side engagement convex portions of the axial outer surface of the cap bottom plate portion 19c is formed. The portions aligned with 48 and 48 are formed in a state of being recessed axially inward. 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 engaging convex portions 41, 41 of the first example and the second example of the embodiment described above are formed on the holder main body 26c of the sensor holder 25c constituting the sensor unit 22c. Not. That is, in the case of this reference example , the axial direction outer end surface of the holder main body 26c is a flat surface.

The sensor unit 22c as described above includes the holder main body 26c, both side surfaces in the circumferential direction of the holder main body 26c, and between the respective side surfaces in the circumferential direction between the respective cap side engaging convex portions 48, 48. The circumferentially opposing side surfaces of the respective cap-side engaging convex portions 48, 48 opposed in the circumferential direction are arranged in a circumferentially engaged state, and the entire surface of the axially outer end face of the holder main body 26c is And abut against the axially inner side surface of the cap bottom plate portion 19c. Then, in this state, the cap 18c (cap main body 37a) is supported and fixed by the bolt 29a. 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 main body 26c are circumferential. Because of the directional engagement, it is possible to prevent the position of the sensor unit 22c from being displaced by the tightening (rotation) torque of the bolt 29a. The other configurations and effects are substantially the same as in the first example of the embodiment described above.

[ Second example of reference example ]
9 to 11 show a second example of the reference example of the present invention. In the case of the sensor-equipped rolling bearing unit 1e of the present embodiment , with the cap 18d of the axially inner side surface of the cap bottom plate portion 19d constituting the cap 18d assembled to the outer ring 4, A cap-side engagement convex portion 48 which is long in the radial direction and protrudes inward in the axial direction is formed at one circumferential position of the axially opposed portion. That is, in the case of this reference example , the cap-side engagement convex portion 48 of one (left side in FIGS. 7 and 8) of the cap-side engagement convex portions 48 of the first example of the above-described reference example is omitted. ing.

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

The sensor unit 22d as described above includes the holder main body 26d and a circumferential side face (right side face in FIG. 10) of the both side faces of the holder main body 26d in the tightening direction α of the bolt 29a. The holder main body 26d is disposed in a state in which it is engaged in the circumferential direction with the circumferential side surface (left side surface in FIG. 10) of the cap side engagement convex portion 48 opposed to the circumferential direction side surface. The contact portion 46 is brought into contact with the axially inner side surface of the cap bottom plate 19c. In this state, the cap 29 d (cap main body 37 b) is supported and fixed by the bolt 29 a. 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 the present embodiment as described above, when the bolt 29a is tightened, a circumferential side surface of the holder main body 26d on the front side in the tightening direction α among the circumferential side surfaces of the holder main body 26d Since the side face and the side face in the circumferential direction of the cap side engagement convex part 48 opposed to each other are engaged in the circumferential direction, the position of the sensor unit 22d is shifted by the tightening (rotation) torque of the bolt 29a. There is nothing to do. The other configurations and effects are substantially the same as those of the second example of the embodiment and the first example of the reference example .

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

Also in the case of the present embodiment , the sensor attachment nut 32b is a press-fit nut which penetrates in the axial direction, as in each of the embodiments described above. In the case of the present embodiment , the sensor mounting nut 32b is fixed by press-fitting the small diameter portion provided on the inner end face in the axial direction into the through hole 49 for fixing the nut from the axial outside of the cap bottom plate 19e. ing. The structure of the sensor attachment nut 32b is substantially the same as that of a general press-fit nut. Also, the sensor attachment nut 32b may have a structure that does not penetrate in the axial direction, that is, a nut-like configuration.

Further, in the case of the present reference example , the circumference of a portion of the axially inner side surface of the cap bottom plate portion 19e which faces the detection surface of the encoder 21 in the axial direction in a state where the cap 18e is assembled to the outer ring 4. The rubber cap side engaging convex portions 48a, 48a are vulcanized and bonded at two positions separated in the direction so as to project radially inward and axially inward. The respective cap-side engaging convex portions 48a, 48a are made of the same rubber material as the seal member 38, and the respective radial outer end portions are continuous with the axial outer end portion of the seal member 38. .

Further, in the case of the present embodiment , the sensor attachment nut 32b is covered by a nut cover portion 51 made of a rubber material similar to the cap side engagement convex portions 48a and 48a and the seal member 38. Specifically, the nut cover 51 covers the outer peripheral surface of the sensor attachment nut 32b and the axial outer end surface (including the axial outer end opening).
Such a nut covering portion 51 is formed in a bottomed cylindrical shape including a cylindrical portion 52 and a bottom plate portion 53 closing the axial outer end opening of the cylindrical portion 52. The nut cover 51 is fixed to the axial outer surface of the cap bottom plate 19 e and the sensor attachment nut 32 b by vulcanization bonding. Thus, the sensor mounting nut 32b is not exposed to the internal space 16 in which the encoder 21 is installed. In this manner, even when foreign matter such as water intrudes from the screwing portion between the nut fixing through hole 49 and the bolt 29a, the foreign matter is prevented from invading the internal space 16.

Further, at two positions in the circumferential direction of the cylindrical portion 52 of the nut covering portion 51, one end portions of connection arm portions 58, 58 made of the same rubber material as the nut covering portion 51 are continuous. . Each of the connecting arm portions 58, 58 has an axially inner end surface fixed to the axially outer side surface of the cap bottom plate portion 19e by vulcanization bonding. Further, the other end portion of each of the connection arm portions 58, 58 and the axially outer side surface of the radially inner end portion of each of the cap side engagement convex portions 48a, 48a are the through holes 50, 50 for rubber members. It is continuous by the rubber material filled inside. That is, in the case of the present embodiment , the seal member 38, the cap side engagement convex portions 48a, 48a, the connection arm portions 58, 58, and the nut cover portion 51 are integrally made of the same rubber material. It is formed.
The seal member 38, the cap side engagement projection 48a, and the nut cover 51 may be provided separately. Under the present circumstances, the material which comprises these each member may be the same, and may mutually differ.

  The cap 18e having the above configuration uses an apparatus comprising a pair of molds (upper and lower molds), and is used for mounting the sensor in a cavity defined between the two molds. With the cap main body 37c to which the nut 32b is fixed, the molten molten rubber can be poured into this cavity. When the cap 18e is formed in this manner, the mold is released into a male thread material (not shown) for vulcanization forming corresponding to the bolt 29a over the entire width of the female screw portion 33b of the sensor attachment nut 32b. By applying an agent and screwing it, the molten rubber can be prevented from flowing into the inner diameter side of the sensor attachment nut 32b.

In the case of the present embodiment, the thickness _{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 (T _{26 e} = T _{27 b} ). That is, in the case of this reference example, the entire sensor holder 25e is formed in a rectangular shape long in the radial direction.
In addition, a holder side through hole 54 is formed at a position in the sensor holder 25e (mounting plate portion 27b) that is aligned with the nut fixing through hole 49. The holder side through hole 54 has a small diameter portion 55 formed in a portion close to the axial outer end, a large diameter portion 56 formed axially inward of the small diameter portion 55, and the large diameter portion with the small diameter portion 55 It consists of the step part 57 which continued with the part 56 and.

In the case of the present embodiment as described above, the holder main body 26e is provided between the respective cap side engaging convex portions 48a and 48a, and both side surfaces in the circumferential direction of the holder main body 26e and these both side surfaces in the circumferential direction And the circumferential side surfaces of the respective cap side engagement convex portions 48a, 48a opposed in the circumferential direction are arranged in a state of being engaged in the circumferential direction. Then, with the entire surface of the axial outer end face of the sensor holder 25e (the holder main body 26e and the mounting plate 27b) in contact with the axial inner surface of the cap bottom plate 19e, the cap 18e is made by the bolt 29a. It is supported and fixed with respect to (cap body 37c). More specifically, the sensor mounting nut 32b fixes the male screw portion 42 of the bolt 29a to the cap bottom plate portion 19d 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 cap 18e (cap main body 37c) is screwed with the female screw 33b of the bolt 29a and tightened with the bolt 29a in a state where the axial outer surface of the head of the bolt 29a is in contact with the step 57. It is supported and fixed against.

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

In the case of the present embodiment having the above-described configuration, the sensor attachment nut 32b is provided on the axially outer side of the cap bottom plate 19e, so that the sensor unit 22e is fixed to the cap 18e. The strength can be improved. The other configurations and effects are substantially the same as those of the second example of the embodiment and the first example of the reference example .

When carrying out the present invention, it is possible to appropriately combine and carry out each example of the embodiments and the reference example described above.

1, 1a, 1c, 1d, 1f, 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 raceway 8 Stationary flange 9 Knuckle 10 Hub body 11 Inner ring 12 caulking portion 13a , 13b inner ring raceway 14 rotating side flange 15 cage 16 inner space 17 seal ring 18, 18a, 18b, 18c, 18d, 18e cap 19, 19a, 19b, 19c, 19d, 19e cap bottom plate portion 20, 20a cap cylindrical portion 21 Encoders 22, 22a, 22b, 22c, 22d, 22e Sensor units 23 Support rings 24 Encoder bodies 25, 25a, 25b, 25c, 25d, 25e Sensor holders 26, 26a, 26b, 26c, 26d, 26e Holder bodies 27, 27a, 27b mounting Plate portion 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 portion 34 Sensor 35 Fitting cylindrical portion 36 Annular portion 37, 37a, 37b , 37c Cap body 38 Sealing member 39 Cap side engagement recess 40 Holder side through hole 41 Holder side engagement protrusion 42 Male thread 43 Cap side engagement protrusion 44 Holder side engagement recess 45 Non-contact 46 Contact 47 step 48, 48a cap side engagement protrusion 49 nut fixing through hole 50 rubber member through hole 51 nut cover 52 cylindrical portion 53 bottom plate 54 holder side through hole 55 small diameter portion 56 large diameter portion 57 step 58 connected arms

Claims (2)

An outer ring that has double rows of outer ring raceways on the inner circumferential surface and does not rotate even when used,
The outer peripheral surface has double rows of inner ring raceways, and is supported on the inner diameter side of the outer ring concentrically with the outer ring, and in the outer peripheral surface, a portion protruding axially outward from the axial outer end of the outer ring A hub provided with a rotating flange for supporting the wheels;
Between the two outer ring raceways and the two inner ring raceways, rolling elements provided so as to be able to roll in a plurality for each row,
An annular encoder formed by alternately changing the magnetic properties of the axially inner surface in the circumferential direction and supported at the axially inner end of the hub concentrically with the hub;
A cap attached to an axially inner end of the outer ring and closing an axially inner end opening of the outer ring;
A sensor that changes an output signal according to a change in the characteristic of the surface to be detected of the encoder in a state axially opposed to the surface to be detected of the encoder, and supported by the cap while holding the sensor A sensor unit including a sensor holder,
A rolling bearing unit with a sensor,
The cap comprises a cap body and a sensor mounting nut,
Among them, the cap body is made of a nonmagnetic metal plate and made of austenitic stainless steel plate in a bottomed cylindrical shape, and a cap cylindrical portion internally fitted and fixed to the axially inner end portion of the outer ring, and this cap And a cap bottom plate for closing the axial inner end opening of the cylindrical portion,
The sensor mounting nut is provided on the cap bottom plate at a position radially offset from a radial center portion concentric with the rotation axis of the hub .
The sensor unit causes an axial outer surface of at least a portion of a holder main body which is a portion holding the sensor in the sensor holder to abut on an axial inner surface of the cap bottom plate portion, and the sensor holder axially outer surface of a convex portion or concave portion formed by circumferentially spaced, through the two holder-side engaging portion, the axially inner side of the cap bottom plate portion, the cap bottom plate The respective holder side engaging portions and the respective cap side engaging portions are engaged by concavo-convex engagement with two cap side engaging portions which are concave portions or convex portions which are formed separately in the circumferential direction in a state where The coupling portion is 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;
Sensor-equipped rolling bearing unit characterized by things. A non-contacting portion in which the axially outer side surface of the sensor holder axially overlaps with the sensor so as not to be in contact with the axially inner side surface of the cap bottom plate portion, and the holder side engaging portions are formed The sensor-equipped rolling bearing unit according to claim 1, wherein the contact portion pressed against the cap bottom plate portion, and the stepped portion in which the non-contact portion and the contact portion are continuous.

Images