JP6287455B2 - Rolling bearing unit with rotational speed detector - Google Patents

Description

  The present invention relates to an improvement in a rolling bearing unit with a rotational speed detecting device for rotatably supporting a vehicle wheel (driven wheel) with respect to a suspension device and detecting the rotational speed of the wheel.

  A rolling bearing unit is used to rotatably support the wheels of the automobile with respect to the suspension system. Moreover, in order to control an anti-lock brake system (ABS) or a traction control system (TCS), it is necessary to detect the rotational speed of a wheel. For this reason, the rolling bearing unit with a rotational speed detection device incorporating a rotational speed detection device in the rolling bearing unit can support the wheel rotatably with respect to the suspension device, and can detect the rotational speed of the wheel. In recent years, it has been widely performed.

  As an example of a conventional structure of a rolling bearing unit with a rotational speed detection device used for such a purpose, Patent Document 1 describes a structure as shown in FIGS. This rolling bearing unit 1 with a rotational speed detection device having a conventional structure rotatably supports a hub 3 as a rotating ring on the inner diameter side of an outer ring 2 as a stationary ring.

  Outer ring 2 has double-row outer ring raceways 4a and 4b on the inner peripheral surface and stationary flange 5 on the outer peripheral surface. Further, the outer ring 2 is supported and supported by a knuckle (not shown) that constitutes a suspension device in use.

  The hub 3 is a combination of a hub body 6 and an inner ring 7. The hub 3 has double-row inner ring raceways 8 a and 8 b on the outer peripheral surface, and is supported concentrically with the outer ring 2 on the inner diameter side of the outer ring 2. Yes. Specifically, the inner ring raceway 8a in the axially outer row is directly formed at the axially intermediate portion of the outer peripheral surface of the hub body 6, and also the inner end of the axial direction (the inner side in the axial direction is assembled to the suspension device. In the state, it refers to the side closer to the center of the vehicle body in the width direction, and the outside in the axial direction refers to the side closer to the vehicle body in the width direction, which is the same throughout the present specification and claims.) The inner ring 7 having the inner ring raceway 8b in the axially inner row formed on the outer peripheral surface is externally fitted and fixed to the small-diameter step portion 9 formed on the outer periphery. The axial inner end surface of the inner ring 7 is held down by a caulking portion 10 formed by plastically deforming the axial inner end of the hub body 6 radially outward. A rotation-side flange 11 for supporting the wheel is provided at a portion of the hub body 6 that protrudes outward in the axial direction from the axial outer end opening of the outer ring 2 at the axial outer end. Yes.

  A plurality of rolling elements 12, 12 are provided between the outer ring raceways 4a, 4b and the inner ring raceways 8a, 8b, respectively, and the hub 3 is rotatable on the inner diameter side of the outer ring 2. I support it.

  Further, an encoder 13 is fitted and fixed to a portion of the outer peripheral surface of the inner ring 7 in the axially inner end portion that is displaced inward in the axial direction from the inner ring raceway 8b. This encoder 13 is formed by combining a support ring 14 formed of a magnetic metal plate with a substantially L-shaped cross section and formed into an annular shape as a whole, and an encoder body 16 attached to the side surface of an annular portion 15 constituting the support ring 14. . The encoder body 16 is formed in a ring shape by a permanent magnet such as a rubber magnet mixed with ferrite powder. The encoder body 16 is magnetized in the axial direction, and the direction of magnetization is alternately and equally in the circumferential direction. It is changed at intervals. Therefore, the south pole and the north pole are alternately arranged at equal intervals on the inner side surface in the axial direction, which is the detected surface of the encoder body 16.

  Further, a seal ring 17 is installed between the axially outer end opening of the outer ring 2 and the axially intermediate part outer peripheral surface of the hub body 6, and a cap 19 is attached to the axially inner end opening of the outer ring 2. Wearing. As a result, both axial end openings of the space 18 in which the rolling elements 12 and 12 and the encoder 13 are installed are closed, and the grease sealed in the space 18 leaks into the external space or exists in the external space. Foreign matter is prevented from entering the space 18.

  The cap 19 has a bottomed cylindrical cap body 20 made by injection molding of a synthetic resin, and a fitting ring formed in a circular shape with an L-shaped cross section by press molding a nonmagnetic metal plate. 21. The cap main body 20 includes a cap cylindrical portion 22 and a cap bottom portion 23 that closes an axially inner end opening of the cap cylindrical portion 22. The fitting ring 21 is fixed (molded) to the inner diameter side portion of the tip end portion of the cap cylindrical portion 22. In addition, a sensor mounting portion 24 that bulges inward in the axial direction (having a larger axial thickness dimension) than the other portions is provided at a radially outward portion of the cap bottom 23. A through hole 25 penetrating in the axial direction is formed in a portion of the sensor mounting portion 24 facing the detected surface of the encoder 13 (encoder main body 16) in the axial direction. And in this through-hole 25, the bottomed cylindrical sensor insertion ring 26 made from a nonmagnetic stainless steel plate is fitted. The sensor insertion ring 26 is embedded in the sensor mounting portion 24 by insert molding at the time of injection molding of the cap body 20. Further, a mounting nut 27 having an inner peripheral surface formed with a female screw is embedded in the portion of the sensor mounting portion 24 that is removed from the through hole 25 by insert molding.

  A sensor unit 28 for detecting the rotational speed is supported and fixed to the cap 19. The sensor unit 28 includes a sensor 29 and a sensor holder 30. The sensor 29 includes a magnetic detecting element such as a Hall element or a magnetoresistive element provided in the detection unit, and changes an output signal in response to a change in characteristics of the detected surface of the encoder 13. The sensor holder 30 is formed by injection-molding synthetic resin, and includes an insertion portion 31 that holds the sensor 29 and an attachment flange portion 32 that is fixed to the cap 19. In such a sensor unit 28, the male thread portion of the bolt 34 inserted through the through hole formed in the mounting flange portion 32 in a state where the insertion portion 31 is inserted into the sensor insertion ring 26, the mounting nut 27. The cap 19 (sensor mounting portion 24) is fixed by being screwed into the female screw portion.

  According to the rolling bearing unit 1 with the rotational speed detection device having the conventional structure having the above-described configuration, the wheel fixed to the hub 3 can be rotatably supported with respect to the suspension device supporting the outer ring 2. Further, when the encoder 13 is rotated together with the hub 3 with the rotation of the wheel, the vicinity of the detection portion of the sensor 29 facing the detection surface of the encoder 13 through the bottom plate portion 35 of the sensor insertion ring 26. The N pole and the S pole existing on the detected surface of the encoder 13 pass alternately. As a result, the direction of the magnetic flux flowing in the magnetic detection elements constituting the sensor 29 is alternately changed, and the characteristics of the magnetic detection elements 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 3, the ABS and TCS can be appropriately controlled by sending the output signal of the sensor 29 to a controller (not shown). Further, in the case of the conventional structure, even if the sensor unit 28 is in a state before being assembled on an assembly line of an automobile manufacturer or the like, the space 18 in which the encoder 13 is installed can be replaced with the cap 19 (and the sensor insertion ring). 26), it is possible to effectively prevent foreign matter from adhering to the encoder 13.

However, in the case of the conventional structure as described above, the following problems may occur.
That is, in the case of the conventional structure, a pair of upper mold 36 and lower mold 37 as shown in FIG. 12, for example, is used to manufacture the cap 19. Specifically, the synthetic resin melted in the cavity 38 having a shape that matches the outer surface shape of the cap 19 is defined in a state where the upper die 36 and the lower die 37 are in contact with each other in the axial direction. Send in. Particularly in the case of a conventional structure, synthetic resin is fed into the cavity 38 with the sensor insertion ring 26 set (insert molding is performed). Further, when performing such insert molding, the bottom plate portion 35 constituting the sensor insertion ring 26 is brought into contact with a part of the lower die 37 in order to regulate the installation position of the sensor insertion ring 26. Similarly, a part of the upper die 36 is abutted against (intruded into) the axially inner side surface (convex curved surface) of the bent portion 41 which is a continuous portion of the cylindrical portion 39 and the flange portion 40 constituting the sensor insertion ring 26. .

  When insert molding is performed as described above, the cylindrical portion 39 of the sensor insertion ring 26 may be elastically deformed (expanded) radially outward based on the pressing force of the upper mold 36 against the sensor insertion ring 26. There is. When injection molding is performed in such a state, and then the cap 19 is taken out from the cavity 38 (the pressing force by the upper die 36 is removed), the cylindrical portion 39 is elastically restored (becomes a small diameter). In addition, there is a possibility that a gap is formed on the coupling surface between the outer peripheral surface of the cylindrical portion 39 and a portion of the synthetic resin that exists around the cylindrical portion 39. When a foreign substance such as water enters the gap, the foreign substance may further move outward in the axial direction and enter the space 18 from the axial inner end of the coupling surface.

  It is generally known that a synthetic resin contracts due to a decrease in volume when cooled and solidifies. For this reason, among the synthetic resins constituting the cap body 20, it is conceivable that the gaps caused by the above-mentioned causes disappear or decrease due to the shrinkage of the portions present around the cylindrical portion 39. However, the inner diameter of the through hole 25 is usually as small as about 10 mm, and the amount of shrinkage accompanying solidification is small, so it is difficult to completely eliminate the gap.

JP 2011-80500 A

  The present invention has been invented to realize a rolling bearing unit with a rotational speed detection device that can sufficiently secure the sealing performance by a cap in view of the above-described circumstances.

The rolling bearing unit with a rotational speed detection device 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, and a plurality of rolling elements. And an encoder, 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.

In particular, in the case of the rolling bearing unit with a rotational speed detection device according to the present invention, the cap has a fitting mandrel, a sensor mounting portion, a nut, and a mounting sleeve .
Fitting the core metal of this is entirely made of metal, it bottomed cylindrical der comprising a metal core cylindrical portion and the core bottom, that have a bolt through-hole in the metal core bottom .
The sensor mounting part is entirely made of rubber, and has a mounting part main body vulcanized and bonded to the inner side surface in the axial direction of the bottom part of the cored bar of the fitting cored bar. In addition, an axially inward opening is formed in a portion of the mounting portion main body facing the encoder in the axial direction, and a part of the sensor holder (portion holding the sensor) can be inserted inside the axial direction. A sensor holding part in which the outer end part (outer end opening part) is closed by a nonmagnetic closing part is provided.
The nut is press-fitted and fixed in the bolt through hole.
The mounting sleeve is formed in a cylindrical shape having both axial ends opened by a material harder than a rubber material constituting the sensor mounting portion, and is embedded in the sensor mounting portion.
Then, the cap is opened in the axially outward direction, and the cored bar cylindrical portion of the fitting cored bar is fitted and fixed to the axially inner end of the outer ring, whereby the axial direction of the outer ring It is assembled at the inner end.
The sensor holder includes an insertion portion that holds the sensor and a mounting flange portion provided at a proximal end portion of the insertion portion.
The sensor unit has the insertion portion inserted inside the sensor holding portion, and the mounting sleeve is sandwiched in the axial direction between the mounting flange portion and the core metal bottom portion, A bolt inserted through the mounting flange portion and the mounting sleeve is screwed into the nut to be supported and fixed to the cap.
An O-ring is compressed between the inner peripheral surface of the mounting sleeve and the outer peripheral surface of the bolt.

In the practice of the present invention, For example, the sensor mounting portion, formed integrally with the mounting portion main body, providing a seal annulus coupled to the outer peripheral surface of the metal core cylindrical portion of the fitting metal core . And this seal | sticker annular part is contact | abutted with respect to the axial direction inner end part of the said outer ring | wheel.
Moreover, when implementing this invention, let the said nonmagnetic obstruction | occlusion part be a part of said metal core bottom part provided in the part facing the said encoder regarding the axial direction, for example. Thereby, the axial direction outer end surface of the insertion part of the sensor holder is opposed to the encoder through a part of the fitting core.
Further, when carrying out the present invention, For example, one of the core metal bottom, to form the metal core through holes in the encoder portion opposite to the axial direction. And let the said nonmagnetic obstruction | occlusion part be a part of said sensor attachment part provided in the part facing the said encoder regarding the axial direction. Thereby, the axial direction outer end surface of the insertion part of the sensor holder is made to face the encoder without the fitting metal core.
Further, preferably when practicing the present invention, For example, the metal core cylindrical portion, fitted directly to the axially inner end portion of the outer ring.

According to the present invention configured as described above, the sealing performance by the cap can be sufficiently secured.
That is, in the case of the present invention, the sensor holding part for inserting a part of the sensor holder provided in the sensor mounting part is opened only in the axial direction by closing the axial outer end part with the nonmagnetic closing part. Yes. For this reason, even when foreign matter such as water enters the outer end in the axial direction between the outer peripheral surface of the sensor holder and the inner peripheral surface of the sensor holding portion, this foreign matter has installed rolling elements and an encoder. There is no invasion of space. That is, there is a gap between the through-hole provided in the sensor mounting portion and the sensor insertion ring fitted in the through-hole, which is problematic in the above-described conventional structure, leading to the space where the encoder is installed. It is never formed. Therefore, according to the present invention, the sealing performance by the cap can be sufficiently secured.
In the case of the present invention, the sensor mounting portion is made of rubber and is coupled to the fitting core by vulcanization adhesion. For this reason, compared with the case where this sensor mounting part is made of a synthetic resin, the coupling between the fitting cored bar and the sensor mounting part is strengthened, and the coupling surface between the fitting cored bar and the sensor mounting part is formed. A gap can be prevented from being generated. Therefore, according to the present invention, the sealing performance by the cap can be sufficiently secured.
Furthermore, even if the area of the coupling portion between the fitting core metal and the sensor mounting portion is reduced, the sensor mounting portion can be reduced in size because the coupling between the fitting core metal and the sensor mounting portion can be maintained firmly. Thus, the weight and material cost of the sensor mounting portion can be reduced.

Further, as described above, a portion of the sensor mounting portion sealing an annular portion provided on, lever to abut against the axially inner end portion of the outer ring, the outer peripheral surface and the outer ring of the metal core cylindrical portion It is possible to effectively prevent foreign matters such as water from entering the fitting portion with the inner peripheral surface of the inner end portion in the axial direction.
Further, as described above , if the cored bar cylindrical part is directly fitted to the inner end part in the axial direction of the outer ring, the cored bar cylindrical part is made of synthetic resin, for example, as shown in FIGS. The cap cylindrical portion is deformed by use as in the case of fitting to the inner end of the outer ring in the axial direction through the cap cylindrical portion of the outer ring, and a gap is formed between the inner peripheral surface of the outer ring and the outer peripheral surface of the cap cylindrical portion. There is no such thing that would occur. Therefore, the sealing performance by the cap can be sufficiently secured.

Sectional drawing which shows the rolling bearing unit with a rotational speed detection apparatus which shows the 1st example of embodiment of this invention. Similarly, the figure corresponded to the C section of FIG. Similarly, the perspective view which takes out and shows a cap. Similarly, the D section enlarged view (a) of Drawing 2 which omits and showing a bolt, and figure (b) showing another structure of the portion equivalent to (a). The figure equivalent to the right half part of FIG. 1 which shows the 2nd example of embodiment of this invention. Similarly, the perspective view which takes out and shows only a cap. The figure similar to FIG. 5 which shows the 3rd example of embodiment of this invention. Similarly, the figure (a) equivalent to the E section of Drawing 7, and the figure (b) showing another structure of the portion equivalent to (a). The enlarged view equivalent to the F section of FIG. 1 which shows the 4th example of embodiment of this invention. Sectional drawing which shows the rolling bearing unit with a rotational speed detection apparatus of the conventional structure. The A section enlarged view of FIG. 10 similarly. The fragmentary sectional view of a metal mold | die shown in order to demonstrate the manufacturing process of a cap similarly.

[First example of embodiment]
1 to 4 show a first example of an embodiment of the present invention. The feature of this example is that the structure of the cap 19a that closes the axially inner end opening of the outer ring 2 is devised. Since the configuration and operational effects of the other parts are basically the same as those of the above-described conventional structure, overlapping illustrations and explanations are omitted or simplified. The description will focus on the parts that were not explained.

  The rolling bearing unit 1a with a rotational speed detection device of this example supports a wheel that is a driven wheel rotatably with respect to a suspension device such as a knuckle and detects the rotational speed of the wheel. A hub 3 that is a rotating wheel is rotatably supported on a radially inner side of a certain outer ring 2 via a plurality of rolling elements 12 and 12.

  The hub body 6 constituting the outer ring 2 and the hub 3 is made of medium carbon steel such as S53C, and at least the surfaces of the tracks 4a, 4b, and 8a are subjected to a hardening process such as induction hardening. On the other hand, the inner ring 7 and the respective rolling elements 12 and 12 constituting the hub 3 are made of high carbon chrome bearing steel such as SUJ2, and are subjected to a hardening process by, for example, quenching. The rolling elements 12 to be used are not limited to the balls as shown in FIG. When the rolling bearing unit with a rotational speed detection device 1a of this example is used for an automobile having a heavy weight, a tapered roller can be used as the rolling element 12.

  In addition, an encoder 13a is externally fitted and fixed (press-fit) to the axially inner end (right end in FIG. 1) of the outer peripheral surface of the inner ring 7. The encoder 13a includes a support ring 14a and an encoder body 16a. Of these, the support ring 14a is formed into an annular shape with a substantially L-shaped cross section by pressing a ferritic stainless steel plate such as SUS430 or a cold rolled steel plate such as SPCC subjected to rust prevention treatment. Has been. Further, the support ring 14a is provided with a cylindrical fitting tube portion 42 and an outward direction that is bent in a radially outward direction from the axially outer end portion (left end portion in FIG. 1) of the fitting tube portion 42. It is comprised from the collar part 43 and the annular ring part 15a provided in the state bent from the axial direction inner end part of the said fitting cylinder part 42 to radial inside. The fitting tube portion 42 is provided in the outer half portion in the axial direction, and is provided on the inner half portion in the axial direction with a small diameter portion directly fitted on the inner end portion in the axial direction of the inner ring 7. And a taper portion that is inclined in a direction in which the outer diameter dimension increases as it goes to. The encoder body 16a 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. The encoder body 16a 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 main body 16a attached to the inner surface in the axial direction of the annular portion 15a, the inner surface in the axial direction (detected surface) of the encoder main body 16a is set in the axial direction of the hub main body 6. The caulking portion 10 formed at the end portion is positioned radially outward.

The cap 19a attached to the inner end of the outer ring 2 in the axial direction is disposed (inserted) inside a metal fitting core 44, a rubber sensor mounting portion 24a, and the sensor mounting portion 24a. And a mounting sleeve 27a.
Of these, the fitting metal core 44 is formed into a bottomed cylindrical shape (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. Petri dish). Such a fitting cored bar 44 includes a cored bar cylindrical part 45 and a cored bar bottom part 46 that closes the axially inner end opening of the cored bar cylindrical part 45.

The metal core bottom portion 46 has an outer diameter side annular portion 47 formed in a portion extending from the radial intermediate portion to the radially outer end portion, and an outer diameter side annular portion 47 at a radially central portion. Also, an inner diameter side disc portion 48 formed in a state protruding inward in the axial direction, a radially inner end portion of the outer diameter side annular portion 47 and a radially outer end portion of the inner diameter side disc portion 48, And a cylindrical intermediate cylindrical portion 49 which is continuous.
A bolt through hole 50 penetrating the inner diameter side disk portion 48 in the axial direction is formed in a portion of the inner diameter side disk portion 48 near the outer end in the radial direction. The inner peripheral surface of the bolt through hole 50 has a cylindrical surface shape in which the inner diameter dimension does not change over the entire length in the axial direction before a nut 62 described later is press-fitted. On the other hand, in the state after the nut 62 is press-fitted, the inner diameter of the inner peripheral surface of the bolt through-hole 50 where the nut 62 is press-fitted is changed over the entire length. The inner half portion in the axial direction is a partial conical surface shape whose inner diameter dimension decreases toward the outer side in the axial direction.

The sensor mounting portion 24a is made of rubber such as acrylonitrile butadiene rubber (NBR) having a hardness of HS 60 to 75, and is coupled to the outer surface of the fitting core metal 44 by vulcanization adhesion. As the rubber material constituting the sensor mounting portion 24a, various rubber materials such as natural rubber, styrene butadiene rubber, urethane rubber, silicone rubber, fluorine rubber, and acrylic rubber can be used.
Such sensor attachment portion 24a includes a mounting portion main body 51 is provided integrally with the mounting portion main body 51, consisting of the cylindrical seal portion 52 that corresponds to the sheet Lumpur annulus.
Of these, the mounting portion main body 51 is formed in a long columnar shape as shown in FIG. 3, and its axially outer end surface is a part of the circumferential direction of the axially inner surface of the outer diameter side annular portion 47. From the inner diameter side disk portion 48, it is coupled to a portion of the inner surface in the axial direction that is hung over a part in the circumferential direction. That is, of the axially outer end surface of the mounting portion main body 51, the portion facing the outer diameter side circular ring portion 47 is positioned more outward in the axial direction than the portion facing the inner diameter side disc portion 48 ( Protruding).

In addition, an insertion portion 31a of a sensor unit 28a, which will be described later, is held inside a portion of the mounting portion main body 51 that faces the detection surface of the encoder 13a (encoder main body 16a) in the assembled state. A sensor holding part 53 is formed for this purpose. The sensor holding portion 53, together with the axially inner end opening axially inner end face of the mounting portion main body 51, it is formed in a state in which the axially outer end opened to the axially outer end face of the mounting portion main body 51 Yes. Such an axially outer end opening of the sensor holding portion 53 has the encoder 13a (encoder main body) of the core metal bottom portion 46 in a state where the sensor mounting portion 24a and the fitting core metal 44 are coupled. 16a) is covered with a portion facing the detection surface in the axial direction. In the case of this example, a portion of the cored bar bottom portion 46 facing the detection surface of the encoder 13a (encoder main body 16a) in the axial direction corresponds to a nonmagnetic blocking portion in the claims.

Further, in the state where the sensor mounting portion 24a and the fitting core metal 44 are coupled, a portion of the mounting portion main body 51 that is opposed to the bolt through hole 50 of the core metal bottom portion 46 in the axial direction is provided. A sleeve holding hole 54 is formed so as to penetrate the mounting portion main body 51 in the axial direction. The inner diameter dimension d ₅₄ of the sleeve holding hole 54 is larger than the inner diameter dimension d ₅₀ of the inner half portion (cylindrical surface portion) in the axial direction of the inner peripheral surface of the bolt through hole 50 of the core metal bottom 46 ( d ₅₄ > d ₅₀ ).

The seal cylindrical portion 52 is formed in a cylindrical shape as a whole, and its inner peripheral surface is coupled to the axially inner end portion of the outer peripheral surface of the cored bar cylindrical portion 45 over the entire periphery. . Such a seal cylindrical part 52 is continuous with a part in the circumferential direction of the inner end face in the axial direction by a continuous part 55 with respect to a part in the circumferential direction of the outer peripheral face of the mounting part main body 51. Further, a seal lip 56 projecting outward in the axial direction is formed over the entire circumference at the radial intermediate portion of the axially outer end surface of the seal cylindrical portion 52. 1 and 2 show the shape of the seal lip 56 in a free state.

The mounting sleeve 27a is made of a material harder than the rubber material constituting the sensor mounting portion 24a, such as synthetic resin or metal. The mounting sleeve 27a has a cylindrical shape with both axial ends open, and a concave groove 57 with a radially inner side and an axially inner side opening is formed on the inner circumferential surface near the axially inner end. It is formed all around. Also, the inner diameter d _27a of the mounting sleeve 27a in the axially outer portion than the concave groove 57 is the inner half in the axial direction of the inner peripheral surface of the bolt through hole 50 of the cored bar bottom 46. Smaller than the inner diameter d _{50 of the} part (d _27a <d ₅₀ ). Such a mounting sleeve 27 a is embedded inside the sleeve holding hole 54 of the mounting portion main body 51. With the mounting sleeve 27a thus embedded in the mounting portion main body 51, the axial inner end surface of the mounting sleeve 27a is located on the same virtual plane as the axial inner end surface of the mounting portion main body 51. doing. On the other hand, the axially outer end surface of the mounting sleeve 27a is identical to the portion of the axially outer end surface of the mounting portion main body 51 that faces the inner diameter side disk portion 48 of the cored bar bottom portion 46 in the axial direction. Located on a plane.
The outer end surface in the axial direction of the mounting sleeve 27 a is in contact with the inner side surface in the axial direction of the cored bar bottom portion 46. Specifically, as shown in FIG. 4 (a), the axially outer end surface of the mounting sleeve 27a is a flat surface, and the radially outer half of the axially inner side surface of the cored bar bottom portion 46 is formed. Are in contact with the peripheral portion of the bolt through hole 50 over the entire circumference.

As shown in FIG. 4 (b), a sleeve-side fitting protrusion 58 that protrudes outward in the axial direction from the other part is provided at a portion closer to the center in the radial direction of the outer end surface in the axial direction of the mounting sleeve 27a. It can also be formed. When such a structure is adopted, the outer peripheral surface of the sleeve side fitting projection 58 is press-fitted into the inner half (cylindrical portion) in the axial direction of the inner peripheral surface of the bolt through hole 50. While being fitted, the bolt outer portion of the axially inner side surface of the cored bar bottom portion 46 is connected to a radially outer portion of the axially outer end surface of the mounting sleeve 27a with respect to the fitting protrusion 58. The entire circumference is brought into contact with the peripheral portion of the hole 50. In this way, the mounting sleeve 27a, it is possible to achieve positioning with respect to the fitting metal core 44.

  The cap 19a having the above-described configuration has a pair of molds (an upper mold 36 and a lower mold 36) as shown in FIG. 12, which partially have a shape that matches the shape of the inner peripheral surface of the sensor holding portion 53. A device comprising one mold of the mold 37) and the other mold partially having a shape (cylindrical shape) matching the outer peripheral surface shape of the sensor holding portion 53. The vulcanized molten rubber is poured into the cavity 38 in a state where the mounting sleeve 27a, a nut 62 (to be described later), and the fitting metal core 44 are disposed in the cavity 38 defined between them. Can be formed. The mounting sleeve 27a is disposed in the cavity 38 in the state shown in FIG. 4 (a) or (b). On the other hand, as will be described later, the nut 62 is disposed in the cavity 38 in a state where the nut-side fitting protrusion 64 of the nut 62 is press-fitted into the bolt through hole 50 of the fitting mandrel 44. .

The cap 19a having the above-described configuration is configured to directly fit (metal fit) the outer peripheral surface of the outer half portion in the axial direction of the core metal cylindrical portion 45 to the inner peripheral surface of the inner end portion in the axial direction of the outer ring 2. The tip end portion of the seal lip 56 of the seal cylindrical portion 52 is assembled to the outer ring 2 by abutting against the inner end surface in the axial direction of the outer ring 2. In this assembled state, the axially outer surface of the cored bar bottom portion 46 (outer diameter side annular ring portion 47) has a predetermined axial gap (air gap) with respect to the detected surface of the encoder 13a. Is in close proximity to each other.
In this manner, in a state where the cap 19a is assembled to the outer ring 2, the coupling surface between the sensor mounting portion 24a and the fitting cored bar 44 of the cap 19a (the boundary surface between the members 24a and 44). ) Does not exist in the space 18 in which the encoder 13a is installed. That is, the coupling surface is not provided in a state of being continuous (exposed) directly to the space 18.

  In the case of this example, the sensor unit 28a for detecting the rotational speed is supported and fixed to the cap 19a having the above-described configuration. The sensor unit 28a includes a sensor 29a and a sensor holder 30a. Among them, the sensor 29a has a magnetic detecting element such as a Hall element or a magnetoresistive element installed in the detecting section, and changes the output signal in response to a change in the characteristics of the detected surface of the encoder 13a. The sensor holder 30a is formed by injection molding a synthetic resin such as polyamide resin, and includes the insertion portion 31a and the mounting flange portion 32a. Of these, the insertion portion 31a has a columnar shape, holds the sensor 29a at its tip (axially outer end), and has an outer diameter that is the same as or slightly smaller than the inner diameter of the sensor holding portion 53. .

  The mounting flange portion 32a is for fixing the sensor holder 30a (sensor 29a) to the cap 19a, and is provided at the base end portion of the insertion portion 31a. Such a sensor unit 28a is inserted through the through hole 59 formed in the mounting flange portion 32a and the inner peripheral surface of the mounting sleeve 27a in a state where the insertion portion 31a is directly inserted into the sensor holding portion 53. The male threaded portion 61 of the bolt 60 is fixedly supported to the cap 19a (sensor mounting portion 24a) by being screwed into the female threaded portion 63 of the nut 62 supported and fixed to the outer surface in the axial direction of the core metal bottom 46. Has been.

  The nut 62 is a through-press-fit nut that is open at both ends in the axial direction, and a nut-side fitting protrusion 64 that protrudes inward in the axial direction is formed at the radially inner half of the inner end surface in the axial direction. The outer peripheral surface of the nut-side fitting projection 64 is a partial conical surface shape whose outer diameter dimension decreases as the axial inner half moves outward in the axial direction. It has a larger diameter than the partial conical surface portion and is formed in a cylindrical surface shape whose outer diameter dimension does not change over the entire length in the axial direction. Then, the outer peripheral surface of the nut-side fitting protrusion 64 is supported by the bolt through hole 50 and the inner surface of the inner diameter side disk portion 48 is supported by a support mold (not shown) or the mounting sleeve 27a. However, the inner diameter side disk portion 48 is fitted from the outside in the axial direction by press fitting, and the outer peripheral surface of the nut side fitting protrusion 64 is bitten into the inner peripheral surface of the bolt through hole 50. As a result, as described above, of the inner peripheral surface of the bolt through hole 50, the outer half in the axial direction of the portion into which the nut 62 is press-fitted extends over the entire length in the axial direction, and the inner diameter dimension does not change. In a planar shape, the inner half portion in the axial direction is a partial conical surface shape in which the inner diameter dimension decreases as it goes outward in the axial direction. In this way, the nut side fitting projection 64 is prevented from coming off from the bolt through hole 50 in the axial direction.

  When the sensor unit 28a is supported and fixed to the cap 19a by the bolt 60, if the mounting sleeve 27a is not provided, the bolt 60 and the nut 62 are screwed together. An axial force (axial compressive force) generated between the head of the bolt 60 and the nut 62 is directly applied to the sensor mounting portion 24a. In such a case, if the sensor mounting portion 24a is made of rubber, the sensor mounting portion 24a may be deformed (the amount of elastic deformation increases) based on the axial force. On the other hand, in the case where the mounting sleeve 27a is provided as in the present example, the axial force can be supported by the mounting sleeve 27a, so that the sensor is based on the screwing of the bolt 60 and the nut 62. It can prevent that the attaching part 24a deform | transforms.

  Further, as described above, with the sensor unit 28a supported and fixed to the cap 19a, the bottom portion of the concave groove 57 of the mounting sleeve 27a and the external thread portion 61 of the outer peripheral surface of the bolt 60 are provided. An O-ring 65 is provided between the portion not formed (portion near the base end of the bolt 60). The O-ring 65 is assembled to the inner diameter side of the concave groove 57 by inserting the bolt 60 into the mounting sleeve 27a in a state where the O-ring 65 is fitted on the outer peripheral surface of the bolt 60. However, the bolt 60 can be inserted into the inner diameter side of the mounting sleeve 27a and the O-ring 65 in a state where the O-ring 65 is previously arranged on the inner diameter side of the concave groove 57.

  According to the present invention configured as described above, the sealing performance by the cap 19a can be sufficiently secured. That is, in the case of this example, the sensor holding portion 53 provided in the sensor mounting portion 24a is opened only inward in the axial direction. For this reason, even when foreign matter such as water enters the outer end in the axial direction between the outer peripheral surface of the sensor holder 30a and the inner peripheral surface of the sensor holding portion 53, this foreign matter is transferred to the rolling element 12. And the space 18 where the encoder 13a is installed does not enter. That is, between the through hole 25 provided in the sensor mounting portion 24 (see FIG. 10) and the sensor insertion ring 26 fitted in the through hole 25, which becomes a problem in the conventional structure described above, There is no gap formed in the space 18. Therefore, according to this example, the sealing performance by the cap 19a can be sufficiently ensured.

In the case of this example, the sensor mounting portion 24a is made of rubber and is coupled to the fitting core metal 44 by vulcanization adhesion. For this reason, compared with the case where this sensor mounting part 24a is made of synthetic resin, the coupling between the fitting cored bar 44 and the sensor mounting part 24a is strengthened, and the fitting cored bar 44 and the sensor mounting part 24a are strengthened. It is possible to prevent a gap from occurring on the coupling surface. Therefore, according to this example, the sealing performance by the cap 19a can be sufficiently ensured.
Furthermore, even if the area of the coupling portion between the fitting core metal 44 and the sensor mounting portion 24a is reduced, the coupling between the fitting core metal 44 and the sensor mounting portion 24a can be firmly maintained. For this reason, the sensor mounting portion 24a can be reduced in size, and the weight and material cost of the sensor mounting portion 24a can be reduced.

  In the case of this example, the outer peripheral surface of the cored bar cylindrical portion 45 of the fitting cored bar 44 is directly fitted to the inner peripheral surface of the inner end portion in the axial direction of the outer ring 2. 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. That is, like the conventional structure described above, the fitting ring 21 (see FIG. 10) is fitted to the inner peripheral surface of the inner end portion in the axial direction of the outer ring 2 through the cap cylindrical portion 22 of the cap body 20 made of synthetic resin. In the case of a structure to be combined, there is a possibility that a deformation such as sag occurs in the cap cylindrical portion 22 by use, and a gap may be formed between the outer ring 2 and the fitting portion of the cap cylindrical portion 22. On the other hand, in the case of this example, the metal cored bar cylindrical portion 45 is directly metal-fitted to the outer ring 2. For this reason, it can prevent that the clearance gap based on deformation | transformation of a sag etc. arises in this cored bar cylindrical part 45. FIG. Therefore, according to this example, the sealing performance by the cap 19a can be sufficiently ensured. It is also possible to easily ensure a constant gap in the axial direction between the sensor 29a and the encoder 13a over a long period of time.

  Further, in the state in which the sensor unit 28a is supported and fixed to the cap 19a, a portion where the bottom portion of the concave groove 57 of the mounting sleeve 27a and the external threaded portion 61 of the outer peripheral surface of the bolt 60 are not formed. The O-ring 65 is held in a compressed state. For this reason, foreign matters such as water intrude into the axially outer end portion between the inner peripheral surface of the mounting sleeve 27a (and the inner peripheral surface of the nut 62) and the outer peripheral surface of the bolt 60. Can be prevented.

[Second Example of Embodiment]
Figure 5-6 shows a second example of the embodiment of the present invention.
For speed sensing rolling bearing unit of the present embodiment, the core metal bottom 46a of the fitting metal core 44a constituting the cap 19b, are formed in a flat plate shape. In addition, the inner half portion in the axial direction of the cored bar cylindrical portion 45a is a tapered portion 66 that is inclined in a direction in which the outer diameter dimension becomes smaller toward the inner side in the axial direction.
A sensor sleeve holding hole 67 is formed in a portion of the mounting portion main body 51a constituting the sensor mounting portion 24b that is opposed to the detected surface of the encoder 13a (encoder main body 16a) in the axial direction in the assembled state. Yes. A sensor sleeve 68 corresponding to the sensor holding portion of the claims is embedded in the inner diameter side of the sensor sleeve holding hole 67.

The sensor sleeve 68 is made of a material harder than the rubber material constituting the sensor mounting portion 24b, such as a synthetic resin or metal, and the entire length is equal to the insertion portion 31a constituting the sensor holder 30a. It has a cylindrical shape with both ends open. Such a sensor sleeve 68 is embedded in the mounting portion main body 51a, and its axial inner end surface is located on the same imaginary plane as the axial inner side surface of the mounting portion main body 51a. The end surface is located on the same virtual plane as the axially outer side surface of the mounting portion main body 51a. Such an axially outer end opening of the sensor sleeve 68 has the encoder 13a (encoder main body) of the cored bar bottom 46a in a state where the sensor mounting part 24b and the fitting cored bar 44a are coupled. 16a) is covered with a portion facing the detection surface in the axial direction.

The inner peripheral surface of the seal cylindrical portion 52a constituting the sensor mounting portion 24b is coupled to the outer peripheral surface of the tapered portion 66 of the cored bar cylindrical portion 45a. That is, the inner diameter of the inner peripheral surface of the seal cylindrical portion 52a increases toward the outer side in the axial direction.
The outer diameter of the seal cylindrical portion 52a is formed such that it can be fitted into the inner circumferential surface of the inner end portion in the axial direction of the outer ring 2 by press fitting. That is, the outer diameter size of the seal cylindrical portion 52a is smaller than the outer diameter size of the seal cylindrical portion 52 of the first example of the embodiment described above.
In the case of this example as well, this seal cylindrical portion 52a is connected to a part in the circumferential direction at the inner end in the axial direction by a continuous part 55a with respect to a part in the circumferential direction of the outer peripheral surface of the mounting part main body 51a. Has been.

The cap 19b of the present example having the above-described configuration is configured such that the outer peripheral surface of the outer half portion in the axial direction of the cored bar cylindrical portion 45a is directly fitted to the inner peripheral surface of the inner end portion in the axial direction of the outer ring 2 (metal fitting). ) as well as, the axial half (the outer peripheral surface of the tape path portion minute 66), the outer ring 2 by fitting the inner through said cylindrical seal portion 52a in the axial direction in the end portion peripheral surface of the outer ring 2 It is assembled. In a state where the assembled in this manner, the sealing cylindrical portion 52a is an axial inner end portion peripheral surface of the outer ring 2, the outer peripheral surface of the axially inner half portion of the metal core cylindrical portion 45a (tape path section min 66 ) In a state of being elastically compressed in the radial direction. In the case of this example, in the state where the cap 19b is assembled to the outer ring 2, the inner surface in the axial direction of the core metal bottom 46a and the inner end surface in the axial direction of the outer ring 2 are on the same virtual plane. positioned.

  The cap 19b having the above-described configuration uses an apparatus composed of a pair of molds (upper mold 36 and lower mold 37) as shown in FIG. 12, and is defined between these molds. The mounting sleeve 27a, the sensor sleeve 68, and the fitting core metal 44a are disposed in the cavity 38, and the vulcanized molten rubber is poured into the cavity 38. it can.

In the case of this example having the above-described configuration, the sensor holder 30a is supported and fixed to the sensor attachment portion 24b ( attachment portion main body 51a) via the sensor sleeve 68. That is, the sensor holder 30a can be positioned in the assembled state without securing a large rigidity around the sensor holder 30a (insertion portion 31a) in the mounting portion main body 51a. 68 can be sufficient. For this reason, the thickness dimension of the part (upper end part of FIG. 5) which aligns with the said continuous part 55a regarding the circumferential direction among the said attaching part main bodies 51a can be made small. As a result, the outer diameter of the seal cylindrical portion 52a is made smaller than that in the first example of the embodiment described above, and the seal cylindrical portion 52a is formed on the inner peripheral surface of the inner end portion in the axial direction of the outer ring 2. A structure that fits inside can be adopted.

In the case of this example, in the state where the cap 19 b is assembled to the outer ring 2, the seal cylindrical portion 52 a has an axially inner end portion inner peripheral surface of the outer ring 2 and an axial direction of the core metal cylindrical portion 45 a. between the outer peripheral surface of the inner halves (tape path portion minutes 66) is sandwiched in a compressed state in the radial direction. For this reason, the seal cylindrical portion 52a works like a packing, and the outer peripheral surface of the axially outer half portion of the core metal cylindrical portion 45a and the inner peripheral surface of the outer ring 2 in the axially inner end portion are fitted. It is possible to prevent foreign substances such as water from entering the part.

  In the case of this example, in the state where the cap 19b is assembled to the outer ring 2, the inner surface in the axial direction of the core metal bottom 46a and the inner end surface in the axial direction of the outer ring 2 are on the same virtual plane. Is located. For this reason, it is easy to perform press-fitting work and press-fitting position management (gap management) when the cap 19 b is supported and fixed to the outer ring 2. Other configurations and operations / effects are the same as those in the first example of the embodiment described above.

[Third example of embodiment]
7 to 8 show a third example of the embodiment of the present invention. In the case of the rolling bearing unit with the rotational speed detection device of this example, the detection surface of the encoder 13a (encoder main body 16a) in the cored bar bottom portion 46b of the fitting cored bar 44b constituting the cap 19c is opposed in the axial direction. In a portion, a core-shaped through hole 69 having a perfect circular shape is formed. In the case of this example, the cored bar through hole 69 is a cylindrical surface that has a full length in the axial direction and does not change its inner diameter before the sleeve side fitting protrusion 72 of the sensor sleeve 68a described later is press-fitted. Is. On the other hand, in the state after the sleeve-side fitting projection 72 of the sensor sleeve is press-fitted, the inner half of the axial direction has a cylindrical surface shape whose inner diameter does not change over the entire length, and the outer half of the axial direction is the shaft. It has a partial conical surface shape in which the inner diameter dimension increases toward the outside in the direction.
Further, a communication hole 70 is formed at one position of the core metal bottom portion 46b around the core metal through hole 69 at a portion not facing the sensor sleeve 68a in the axial direction. The communication holes 70 can also be formed at a plurality of locations around the core metal through hole 69.

  In this example, as will be described later, the fitting cored bar 44b (cored bar bottom 46b) exists between the detected surface of the encoder 13a (encoder main body 16a) and the detecting part of the sensor 29a. Not. For this reason, the metal material of the fitting core metal 44b may be made of a magnetic material or a non-magnetic material. If this fitting mandrel 44b is made of a cold-rolled steel sheet for deep drawing such as SPCE which is inexpensive and easy to press, it is expensive and difficult to press like austenitic stainless steel. Compared with the case of making a magnetic metal plate, the manufacturing cost can be reduced.

In the case of this example, the disk-shaped bottom plate portion 71 is integrated with the mounting portion main body 51a of the sensor mounting portion 24b in a state in which the axial outer end opening of the cored bar through hole 69 of the cored bar bottom portion 46b is closed. Provided. The bottom plate portion 71 corresponds to the nonmagnetic blocking portion in the claims. Specifically, the bottom plate portion 71 has a portion closer to the radially outer end of the inner side surface in the axial direction of the bottom plate portion 71 on the outer side in the axial direction than the metal core bottom portion 46b. It is provided in a state of being connected to the side surface over the entire circumference. Further, the bottom plate portion 71 is a portion of the axially inner side surface near the radially outer end that is opposed to the communication hole 70 in the axial direction, of the axially outer end surface of the mounting portion main body 51a. A portion facing the communication hole 70 in the axial direction is continuous with a rubber material filled on the inner diameter side of the communication hole 70.

In the case of this example, similarly to the second example of the above-described embodiment, the sensor sleeve 68a corresponding to the sensor holding portion of the claims is embedded in the sensor sleeve holding hole 67 of the mounting portion main body 51a. It is out. A sleeve side fitting projection 72 is formed on the radially inner half of the axially outer end surface of the sensor sleeve 68a so as to project outward in the axial direction. The outer peripheral surface of the sleeve-side fitting protrusion 72 is symmetrical with respect to the outer peripheral surface of the nut-side fitting protrusion 64 (see FIGS. 2 and 4) in the axial direction, that is, the outer half of the axial direction is outside the axial direction. A cylindrical surface with a partially conical surface whose outer diameter increases in the direction of the axis, and whose inner half in the axial direction has a larger diameter than the partial conical surface, and whose outer diameter does not change over the entire length in the axial direction. It is formed in a shape.
The sleeve-side fitting protrusion 72 is similar to the case where the nut-side fitting protrusion 64 of the nut 62 is press-fitted into the bolt through hole 50 (see FIGS. 2 and 4). The outer side surface in the axial direction is pressed into the inner peripheral surface of the cored bar through-hole 69 while being supported by a support die (not shown) (the outer peripheral surface of the nut-side fitting projection 64 is fitted to the inner peripheral surface of the cored bar through-hole 69 ). Bite) In this state, of the inner peripheral surface of the cored bar through-hole 69, the inner half in the axial direction has a cylindrical surface shape whose inner diameter does not change over the entire length, and the inner diameter increases toward the outer side in the axial direction. It becomes the shape of a partial conical surface where the dimension increases. In this manner, thereby achieving the positioning relative to the fitting metal core 44b of the sensor sleeve 68a.

When the present embodiment is carried out, as shown in FIG. 8 (b), the sleeve side fitting protrusion is formed at a part in the circumferential direction of the outer peripheral surface of the sensor sleeve 68a near the outer end in the axial direction. A communication groove 73 that is long in the axial direction can also be formed in a range extending from 72 to a portion that is displaced inward in the axial direction from the sleeve-side fitting protrusion 72. Then, the inner surface in the axial direction of the bottom plate portion 71 and the outer end surface in the axial direction of the mounting portion main body 51a are placed in a space between the inner peripheral surface of the cored bar through hole 69 and the bottom portion of the communicating groove 73. Continue with filled rubber material. In this case, the communication hole 70 can be omitted. Other configurations and operations / effects are the same as those in the second example of the embodiment described above.

[Fourth Example of Embodiment]
FIG. 9 shows a fourth example of the embodiment of the present invention.
In the case of the rolling bearing unit with the rotational speed detection device of this example, the fitting cored bar 44c constituting the cap 19d is composed of the cored bar cylindrical part 45b and the cored bar closing the axially inner end opening of the cored bar cylindrical part 45b. The bottom part 46c and the flange part 74 are comprised. The flange portion 74 is formed in a state in which the flange portion 74 is bent at a right angle radially outward from the inner end in the axial direction of the cored bar cylindrical portion 45b, and an intermediate portion thereof is folded back 180 degrees radially inward. The radially inner end of the flange portion 74 is continuous with the radially outer end of the cored bar bottom portion 46c. In the case of this example, the axial inner side surfaces of the flange portion 74 and the cored bar bottom portion 46c are located on the same plane.
Further, a flange communication hole 75 is formed at a position in the circumferential direction near the radially inner end of the flange portion 74 so as to penetrate the flange portion 74 in the axial direction.

In the case of this example, an annular annular portion 76 having a substantially circular cross section in a free state is formed over the entire circumference at the radially inner end of the flange portion 74 in the axially outer side surface. Such an annular seal portion 76 includes a portion of the inner end surface in the axial direction facing the flange communication hole 75 in the axial direction and an outer end surface of the mounting portion main body 51b in the axial direction. The rubber material filled in the inner diameter side of the flange communication hole 75 is continuous with the portion facing the.
In the case of this example, a chamfered portion 77 having a partially conical surface is formed over the entire circumference at the axially inner end of the inner circumferential surface of the outer ring 2.

  The cap 19d having the above-described configuration is directly fitted on the inner peripheral surface of the outer ring 2 with the outer peripheral surface of the cylindrical core portion 45b extending from the axial intermediate portion to the axial outer end portion. The outer ring 2 is assembled to the outer ring 2 by fitting (metal fitting) and bringing the axially outer side surface of the flange portion 74 into contact with the inner end surface of the outer ring 2 in the entire axial direction. In this assembled state, the seal annular portion 76 includes the chamfered portion 77 of the outer ring 2, the radially inner end of the axially outer surface of the flange portion 74, and the axial direction of the cored bar cylindrical portion 45b. It is clamped in a compressed state with the inner end portion outer peripheral surface.

In the case of this example as well, a cored bar through hole 69 is formed in a part of the cored bar bottom 46c in the circumferential direction at a portion facing the detected surface of the encoder 13a (encoder main body 16a) in the axial direction. ing. In the case where the flange portion 74 is provided on the fitting core metal 44c as in this example, the core metal through hole 69 can be formed stably and easily.
That is, when the structure in which the cored bar cylindrical part 45b of the fitting cored bar 44c is directly fitted to the inner peripheral surface of the axially inner end part of the outer ring 2 as in this example is adopted, the cored bar cylindrical part 45b is The outer ring 2 needs to be formed concentrically with high accuracy with respect to the inner peripheral surface of the inner end portion in the axial direction. For this reason, the cored bar through hole 69 is formed in the cored bar bottom part 46c after the fitting cored bar 44c is formed in a bottomed cylindrical shape (petriform). In the case where the flange portion 74 is provided on the fitting core metal 44c as in this example, among the dies (not shown) used when forming the core metal through hole 69, the fitting core metal 44c. The cored bar through-hole 69 can be formed in a state where a portion located radially outward of the cored bar cylindrical part 45 b is stably supported by the axially inner side surface of the flange part 74.
Further, when the flange portion 74 is formed on the fitting metal core 44c as in this example, the manufacturing cost can be reduced if the flange portion 74 is made of a cold-rolled steel plate for deep drawing such as SPCE which is easy to press.

The present invention can also be implemented by appropriately combining the structures of the examples of the above-described embodiments.
Further, in each example of the above-described embodiment, the attachment body of the sensor attachment portion is formed in a state of being coupled only to a part of the axial inner side surface of the bottom portion of the fitting metal core. By adopting such a structure, the material cost and weight of the sensor mounting portion can be reduced. On the other hand, when implementing this invention, the attachment part main body of a sensor attachment part can also be provided in the state which covers the whole outer surface of the said fitting metal core, for example. By adopting such a structure, it is possible to prevent pebbles and the like wound up by the tire during operation from directly hitting the inner side surface in the axial direction of the bottom part of the cored bar.

DESCRIPTION OF SYMBOLS 1, 1a Rolling bearing unit with a rotational speed detection apparatus 2 Outer ring 3 Hub 4a, 4b Outer ring raceway 5 Stationary side flange 6 Hub body 7 Inner ring 8a, 8b Inner ring raceway 9 Small diameter step part 10 Caulking part 11 Rotation side flange 12 Rolling element 13, 13a Encoder 14, 14a Support ring 15, 15a Ring portion 16, 16a Encoder body 17 Seal ring 18 Space 19, 19a, 19b, 19c, 19d Cap 20 Cap body 21 Fitting ring 22, 22a Cap cylindrical portion 23, 23a, 23b Cap bottom part 24, 24a, 24b Sensor attachment part 25 Through hole 26 Sensor insertion ring 27, 27a Attachment sleeve 28, 28a Sensor unit 29, 29a Sensor 30, 30a Sensor holder 31 Insertion part 32, 32a Attachment flange part 33 Male thread part 34 volts 5 bottom plate part 36 upper mold 37 lower mold 38 cavity 39 cylindrical part 40 collar part 41 bent part 42 fitting cylinder part 43 outward flange part 44, 44a, 44b, 44c fitting core metal 45, 45a, 45b core metal cylinder part 46 46a, 46b, 46c Core metal bottom part 47 Outer diameter side annular part 48 Inner diameter side disk part 49 Intermediate cylindrical part 50 Bolt through hole 51, 51a, 51b Mounting part main body 52, 52a Seal cylindrical part 53, 53a Sensor holding Part 54 Sleeve holding hole 55, 55a Continuous part 56 Seal lip 57 Concave groove 58 Sleeve side fitting protrusion 59 Through hole 60 Bolt 61 Male thread part 62 Nut 63 Female thread part 64 Nut side fitting protrusion 65 O-ring 66 Tapered part 67 Sensor sleeve holding hole 68, 68a Sensor sleeve 69 Core metal through hole 70 Communication hole 71 Bottom plate part 72 Three 73 consecutive side fitting projection Spoken recessed groove 74 flange 75 flange passage 76 seal annulus 77 chamfer

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 in a state of being opposed to the detected surface of the encoder, and holding the sensor, A sensor unit comprising a sensor holder supported on the opposing part;
A rolling bearing unit with a rotational speed detection device comprising:
The cap has a fitting mandrel, a sensor mounting portion, a nut, and a mounting sleeve ,
Fitting the core metal of this is entirely made of metal, I bottomed cylindrical der comprising a metal core cylindrical portion and the core bottom, you have a bolt through-hole in the metal core bottom The
The sensor mounting part has a mounting part body made entirely of rubber and vulcanized and bonded to the inner side surface in the axial direction of the bottom part of the cored bar of the fitting core. A sensor holding portion is provided in the opposite portion, the inner side in the axial direction being open, and a part of the sensor holder can be inserted inside thereof, and the outer end portion in the axial direction is closed by a nonmagnetic closing portion. And
The nut is press-fitted and fixed in the bolt through hole,
The mounting sleeve is configured in a cylindrical shape with both axial ends opened by a material harder than the rubber material constituting the sensor mounting portion, and is embedded in the sensor mounting portion,
In the state where the cap is opened outward in the axial direction, the core metal cylindrical portion of the fitting core is fitted and fixed to the axial inner end of the outer ring, so that the axial inner end of the outer ring is fixed. Is assembled in the department ,
The sensor holder has an insertion portion that holds the sensor, and a mounting flange portion provided at a proximal end portion of the insertion portion,
In the sensor unit, the insertion portion is inserted inside the sensor holding portion, and the attachment sleeve is held in the axial direction between the attachment flange portion and the core metal bottom portion. A bolt inserted through the through hole of the flange portion and the mounting sleeve is screwed into the nut, thereby being supported and fixed to the cap.
An O-ring is compressed between the inner peripheral surface of the mounting sleeve and the outer peripheral surface of the bolt;
Rolling bearing unit with rotation speed detector. The non-magnetic blocking portion is a part of the cored bar bottom provided in a portion facing the encoder in the axial direction;
The rolling bearing unit with a rotational speed detection device according to claim 1, wherein an outer end surface in an axial direction of the insertion portion of the sensor holder faces the encoder through a part of the fitting core. A cored bar through hole is formed in a portion facing the encoder in the axial direction of the cored bar bottom,
The non-magnetic blocking portion is a part of the sensor mounting portion provided in a portion facing the encoder in the axial direction;
The axially outer end surface of the insertion portion of the sensor holder, the are the encoder and the counter without passing through the fitting metal core, rolling bearing unit according to claim 1.

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