JPH04119626U - Bearing unit for rotational speed detection - Google Patents

Abstract

(57) [Summary] [Purpose] To facilitate the work of attaching and detaching the sensor 19 to the attachment portion 3 of the fixed ring 2. [Structure] A sensor 19 is held in a holder 20. A locking plate 22 is attached to the holder 20. The hook parts 23, 23 at the inner ends of the elastic leg pieces 21, 21 formed on the locking plate 22 engage with the locking grooves 15, 15 on both sides of the mounting part 3, and the holder 20
is supported on the mounting part 3.

Description

[Detailed explanation of the idea]

0001

[Industrial application field]

The rotating speed detection bearing unit according to this invention is suitable for use in anti-lock brake systems. (ABS) or traction control system (TCS). , which rotatably supports the wheels of the automobile relative to the suspension system, and which controls the rotation of the wheels. Used to detect speed.

0002

[Conventional technology]

The wheels of a motor vehicle must be rotatably supported on a suspension system. or, Anti-lock brake system (ABS) or traction control system In order to control the system (TCS), it is necessary to detect the rotational speed of the wheel. Conventionally, as a bearing unit for detecting rotational speed for this purpose, Utility Model Application No. 1-156464 The publication discloses a rotational speed detection bearing unit having a structure as shown in FIG. There is.

0003 In FIG. 11, a fixed ring 2 having double rows of outer ring raceways 1, 1 on its inner peripheral surface is A mounting portion 3 formed on the circumferential surface allows it to be freely supported by a suspension device. This fixed ring 2 Inside is a rotating ring, and each outer peripheral surface faces the outer ring raceway 1, 1. A pair of inner rings 5, 5 having inner ring raceways 4, 4 are arranged, and the outer ring raceway of the fixed ring 2 is arranged. 1, 1 and the inner ring raceways 4, 4 of the inner rings 5, 5, respectively, by cages 6, 6. By providing a plurality of held rolling elements 7, 7, a pair of inner rings can be formed inside the fixed ring 2. 5, 5 are rotatably supported. Furthermore, this pair of inner rings 5, 5 are connected to the hub 8. It is fixed externally.

0004 Further, a pulse rotor 9 is fitted onto the outer peripheral surface of the end of the inner ring 5 on one side (on the left in FIG. 11). Fixed. On the other hand, in a part of the fixed ring 2, between the double row outer ring raceways 1 and 1, The sensor 10 is supported on the part, and the sensor 10 is attached to the outer peripheral side of the pulse rotor 9. It is facing from

[0005] The support portion of the sensor 10 is configured as shown in FIGS. 12 and 13. fixed wheel 2 is formed with a through hole 11 extending in the diametrical direction, and the sensor 10 is inserted into this through hole 11. is inserted. A mounting plate 1 is attached to the outer end of this sensor 10 (lower end in FIG. 12). 2 is fixed, and this mounting plate 12 is fixed to the outer surface of the fixed ring 2 with screws 13. By doing so, the sensor 10 is supported at a predetermined position.

[0006] The rotational speed detection bearing unit configured as described above is mounted on a vehicle supported by the hub 8. The wheel is rotatably supported with respect to a suspension device that supports the fixed wheel 2, and the above-mentioned vehicle Detect the rotation speed of the wheel.

[0007] That is, as the wheel rotates, the output of the sensor 10 is proportional to the rotational speed of the wheel. The output signal of this sensor 10 is input to a controller (not shown) because it changes at the same frequency. Then, the rotational speed of the above wheel is determined, and the ABS and TCS are adjusted to the determined rotation speed. Appropriately controlled by rotation speed.

[0008]

[Problem that the idea aims to solve]

However, the conventional bearing unit for rotational speed detection, which is configured and operates as described above, In this case, the work of attaching and detaching the sensor 10 to the fixed ring 2 was troublesome.

[0009] That is, when attaching or detaching the sensor 10 to the fixed ring 2, tighten the screw 13 or It is unavoidable that the work of putting on and taking off the clothes is troublesome and time consuming. It was.

0010 The rotational speed detection bearing unit of the present invention was designed to address the above-mentioned problems. It is something that was given.

[0011]

[Means to solve the problem]

The rotational speed detection bearing unit of the present invention has a double-row outer ring raceway on the inner circumferential surface. a fixed ring, and a double-row inner ring raceway facing the outer ring raceway on the outer peripheral surface of each ring. a rotating ring provided between the outer ring raceway of the fixed ring and the inner ring raceway of the rotating ring. A plurality of rolling elements, a pulse rotor supported on the outer circumferential surface of the rotating ring, and one of the fixed wheels. and a sensor supported by the pulse rotor and facing the pulse rotor.

0012 Further, in the rotational speed detection bearing unit according to claim 1, the fixed A mounting part fixed to the outer peripheral surface of the ring and a notch formed on the outer peripheral edge of this mounting part. and a locking groove formed on the side surface of the mounting part at a part closer to the inner circumference than this notch. , a holder holding the above-mentioned sensor, and a holder protruding inward from the inner peripheral side of this holder. The holder includes an elastic leg piece and a hook portion formed on an inner circumferential end of the elastic leg piece. is inserted inside the notch, insert the hook at one end of the elastic leg into the locking groove. The sensor is characterized in that the sensor is supported by the fixed ring by engagement.

[0013] Further, in the rotational speed detection bearing unit according to claim 2, the fixed A mounting part fixed to the outer peripheral surface of the ring, and a part formed in this mounting part extending in the axial direction of the fixed ring. an inward flange formed at the end of the through hole, and an inward flange formed at the end of the through hole; A notch formed on the inner peripheral edge of the flange-like part and a cutout part that holds the sensor at one end and A main part of the holder that can be inserted into the through hole, and a part that is continuous from the other end surface of the main part of the holder. a small diameter part that can be freely inserted into the inside of the inward flange-like part, and an outside of this small diameter part. A locking protrusion provided on the circumferential surface that can freely pass through the notch, and a periphery of the small diameter portion. is provided on the holder and is held between the inner surface of the inward flange-shaped part and the other end surface of the holder main part. and a compression spring provided on the outer circumferential surface of the holder main part near one end. a non-circular flange, a locking groove formed on the side surface of the mounting section, and an outer peripheral edge of the mounting section; and a shape that can be freely fitted into the outer peripheral edge of the flange and can be freely engaged with the locking groove. and a rotation prevention piece having a fixed hook portion, and the locking protrusion is passed through the notch portion. While rotating the main part of the holder from the By aligning them together, the main part of the holder is prevented from rotating, and the sensor is fixed as above. It is characterized by being supported by a ring.

[0014] Further, in the rotational speed detection bearing unit according to claim 3, the fixed A mounting part fixed to the outer peripheral surface of the ring, and a part formed in this mounting part extending in the axial direction of the fixed ring. a through-hole holding said sensor at one end and having an outer diameter smaller than the inner diameter of said through-hole. A holder main part having a A flange portion having a non-circular shape and a rim portion formed at the opening periphery of one end of the through hole on the side surface of the mounting portion. a recess into which the flange can be fitted without rattling, and an inner circumferential surface of the through hole and the hole. A cylindrical part that can be freely inserted between the outer circumferential surface of the main part of the cylinder and a shape on the outer circumferential edge of the other end of this cylindrical part. A locking sleeve having a stopper formed therein, and an inner peripheral surface of the locking sleeve and the above-mentioned hole. and a concave-convex engaging part provided between the outer circumferential surface of the holder main part, and the holder main part is provided with a through hole. With the collar portion fitted into the recess, the locking sleeve is inserted into the The above sensor can be inserted between the inner peripheral surface of the through hole and the outer peripheral surface of the main part of the holder. It is characterized by that the support is supported by the above-mentioned fixed ring.

[0015] Furthermore, in the rotational speed detection bearing unit according to claim 4, the fixed A mounting part fixed to the outer peripheral surface of the fixed ring, and a mounting part formed in this mounting part in the axial direction of the fixed ring. Hold the above-mentioned sensor at one end with a through-hole that is from the inner diameter of the through hole provided at the other end of this holder. The flange has a large outer diameter, the inner diameter into which the holder can be inserted, and the inner diameter of the through hole. A locking cylinder having an outer diameter smaller than the A holding hole formed in the diametrical direction of the locking cylinder and a locking hole held within this holding hole. A locking ball formed on the outer circumferential surface of the holder in a state that can be freely engaged with the locking ball. A locking groove is provided between the outer circumferential surface of the locking cylinder and the inner circumferential surface of the through hole, and and a pressing means for pressing the ball stopper in a direction protruding inward from the holding hole. By inserting the slider into the locking cylinder and engaging the locking groove and the locking sphere, the It is characterized in that the sensor is supported by the fixed ring.

[0016]

[Effect]

In the case of the rotational speed detection bearing unit of the present invention configured as described above, both The work of attaching and detaching the sensor to the fixed ring can be done easily and quickly.

[0017]

【Example】

1 and 2 show a first embodiment of the present invention, which corresponds to the invention set forth in claim 1. are doing. A fixed ring 2 having double row outer ring raceways 1, 1 on its inner circumferential surface has a shape on its outer circumferential surface. The attached mounting portion 3 allows it to be freely supported on a suspension system. Inside this fixed ring 2 In this example, a hub 8, which forms a rotating ring together with an inner ring 5 described below, is rotatably supported. Ru.

[0018] That is, the outer circumferential surface of the hub 8 and the outer circumferential surface of the inner ring 5 externally fitted and fixed to the hub 8. Inner ring raceways 4, 4 facing the outer ring raceways 1, 1 are formed, and the outer ring raceways 1, 1 and inner ring raceways 4, 4, a plurality of rollers are held by cages 6, 6, respectively. By providing the movable bodies 7, 7, the hub 8 is rotatably supported inside the fixed ring 2. There is.

[0019] Also, on the outer circumferential surface of the intermediate portion of the hub 8, inside the wheel mounting flange 16 (see Fig. On the right side of 1), a metal plate is press-formed to have a roughly U-shaped cross section, making the whole ring annular. A pulse rotor 17 formed in a shape is externally fitted and fixed. And this pulse rotor 17 and the inner peripheral surface of the outer end of the fixed ring 2, and the outer peripheral surface of the inner end of the inner ring 5. Seal members 18, 18 are installed between the inner circumferential surface of the inner end of the fixed ring 2.

[0020] On the other hand, a rectangular notch 14 is formed on the outer peripheral edge of the mounting portion 3 as shown in FIG. On both sides of the mounting portion 3, a portion closer to the inner circumference than this notch portion 14 A locking groove 15, 15 is formed in each.

[0021] The sensor 1 faces the outer peripheral surface of the pulse rotor 17 from the outside in the diametrical direction. 9 includes a holder 20 made of synthetic resin (or metal) and is formed integrally therewith. There is. Then, fold an elastic metal plate such as a stainless steel plate into this holder 20. It is covered with a locking plate 22 formed by bending. On the inner circumferential side of this locking plate 22, , four elastic leg pieces 21, 21 are provided, and the locking plate 22 is placed over the holder 20. In this state, the inner ends of each elastic leg piece 21, 21 are at the four corners of the inner circumferential side of the holder 20. It will be in a state where it protrudes inward.

[0022] Further, hook portions 23, 23 are formed at the inner peripheral end portions of each of the elastic leg pieces 21, 21. Ru. Then, the holder 20 covered with the locking plate 22 as described above is inserted into the notch 14. When the hooks 23, 23 at the ends of each of the elastic leg pieces 21, 21 are inserted into the inside of the As shown in FIG. A sensor 19 is supported by the fixed ring 2.

[0023] Further, a restraining plate portion 24 is formed inside the central portion of the locking plate 22, so that the locking plate 2 2 is placed on the holder 20, the two members 22 and 20 should not be separated from each other. At the same time, insert the holder 20 inside the notch 14 and press the ends of each elastic leg piece 21, 21. With the hook parts 23, 23 of the parts engaged with the locking grooves 15, 15, the pressing plate part 24 presses the inner surface 14a of the notch 14, and the hooks 23, 23 and the locking groove 15 , 15, and at the same time securely engage the holder 20 inside the notch 14. I try to keep it from rattling.

[0024] In the case of the rotational speed detection bearing unit of the present invention configured as described above, the fixed ring 2 The work of attaching and detaching the sensor 19 can be done easily and quickly.

[0025] That is, when mounting the sensor 19 on the fixed ring 2, a holder with the locking plate 22 attached is used. 20 is pressed against the notch 14 formed in the mounting part 3, and the ends of the elastic leg pieces 21, 21 are The fixed ring 2 can be attached by engaging the hooks 23, 23 of the parts with the locking grooves 15, 15. A holder 20 holding a sensor 19 is supported in the portion 3.

[0026] Also, remove the hook portions 23, 23 of each of the elastic leg pieces 21, 21 from the locking grooves 15, 15. By removing it, you can easily and quickly remove the sensor 19 from the fixed ring 2. . Preferably, the holder 20 is adhered to the locking plate 22. Furthermore, each elasticity The leg pieces 21, 21 are formed integrally with the holder 20 from a synthetic resin having elasticity. Also good.

[0027] Next, FIGS. 3 to 6 show a second implementation of the present invention, which corresponds to the invention described in claim 2. An example is shown.

[0028] A mounting portion 3 fixed to the outer peripheral surface of the fixed ring 2 has a cross section extending in the axial direction of the fixed ring 2. A circular through hole 25 is formed, and an inward flange is formed on the inner peripheral edge of the end of this through hole 25. A shaped portion 26 is formed. Then, at the inner peripheral edge of this inward flange-shaped portion 26, the above-mentioned At diametrically opposite positions of the cross section of the through hole 25, as shown in FIG. A pair of notches 27, 27 are formed perpendicular to the diametrical direction.

[0029] The holder main part 28 holds the sensor 19 at one end and can be freely inserted into the through hole 25. From the other end surface, a small diameter portion 29 that can be freely inserted inside the inward flange portion 26 is inserted into the upper portion. It is provided in a continuous state from the holder main part 28. And this small diameter part 29 Locking protrusions 30, 30 are formed on the outer circumferential surface of the end portion so as to be able to pass freely through the notches 27, 27. are doing.

[0030] Further, a compression spring 31 is provided around the small diameter portion 29, and this compression spring 31 is It can be freely held between the inner surface of the inward flange-shaped portion 26 and the other end surface of the holder main portion 28. are doing.

[0031] On the other hand, on the outer peripheral surface of the holder main portion 28 near one end, a flange portion 3 having a non-circular outer peripheral shape is provided. 2 are provided. Also, on the outer surface of the mounting portion 3, a portion closer to the inner circumference than the through hole 25 and a locking groove on the inner surface of the mounting portion 3 at a portion closer to the outer periphery than the through hole 25. 15 and 15 are provided, respectively.

[0032] Furthermore, 33 is used to bend and form elastic metal plates such as stainless steel plates. It is a anti-rotation piece made of solid wood. This anti-rotation piece 33 holds the collar portion 32 on both sides. The mounting portion 3 is connected between a pair of leg portions 34, 34 that can be freely held between the two leg portions 34, It has a locking part 35 that can freely fit the outer peripheral edge of the. Then, each leg portion 34, 34 and A hook portion 23 that can be freely engaged with the locking grooves 15, 15 is provided at the inner peripheral end of the locking portion 35, respectively. , 23.

[0033] Each member configured as described above has the holder main portion 28 inserted into the through hole 25 of the mounting portion 3. The locking protrusions 30, 30 formed on the small diameter portion 29 are shaped into the inward flange portion 26. After passing through the formed notches 27, 27, the holder main portion 28 is rotated. At the same time, the anti-rotation piece 33 is fitted to the outer periphery of the mounting portion 3 to be assembled. make it happen

[0034] That is, after passing the locking protrusions 30, 30 through the notches 27, 27, the above-mentioned hole is inserted. By rotating the holder main part 28, this holder main part 28 can be removed from the through hole 25. The compression spring 31 is prevented from slipping out, and the compression spring 31 is inserted into the inner flange portion 26. The holder is compressed between the side surface and the other end surface of the holder main portion 28, and the holder is compressed inside the through hole 25. To prevent the main part 28 of the main part 28 from shaking.

[0035] Furthermore, the anti-rotation piece 33 is fitted onto the mounting portion 3, and the leg portions 34 of this anti-rotation piece 33, 34 to sandwich the flange 32 fixed to the outer peripheral surface of the holder main part 28 from both sides. By preventing the holder main part 28 from rotating, the holder main part 28 is held. A fixed sensor 19 is supported on the fixed ring 2. For extracting the signal from sensor 19 As shown in FIG. 6, the cord 36 is connected to the holder main It connects to the inner end of section 28.

[0036] In the case of this embodiment as well, the work of attaching and detaching the sensor 19 to the fixed ring 2 is performed by tightening the screw. It can be done easily and quickly without twisting or loosening.

[0037] Next, FIGS. 7 to 8 show a third implementation of the present invention, which corresponds to the invention recited in claim 3. An example is shown.

[0038] A mounting portion 3 fixed to the outer circumferential surface of the fixed ring 2 includes a mounting portion 3 extending in the axial direction of the fixed ring 2. A through hole 37 is formed. Between this through hole 37 and the outer peripheral surface of the mounting portion 3 is provided with a slit 38 for passing the cord 36. In addition, the above mounting part 3 On the outer surface of the through hole 37, a flange 40 described below is attached to the periphery of the opening at one end of the through hole 37. A recess 41 is formed into which it can be inserted freely.

[0039] The holder main portion 39 holding the sensor 19 at one end has a diameter larger than the inner diameter of the through hole 37. It has a small outer diameter, and a flange 40 with a non-circular outer circumferential shape is provided on the outer circumferential surface near one end. It's on. 42 is a locking sleeve, and this locking sleeve 42 is connected to the through hole 37. A cylindrical portion 43 that can be freely inserted between the inner circumferential surface and the outer circumferential surface of the holder main portion 39; It consists of an outward flange-shaped stopper 44 formed on the outer peripheral edge of the other end of the cylindrical portion 43. has been completed.

[0040] A locking groove 45 having a V-shaped cross section is provided in the middle part of the inner peripheral surface of the locking sleeve 42. A locking protrusion 46 that can be freely engaged with the locking groove 45 is provided at the middle part of the outer circumferential surface of the main body portion 39. They are respectively formed to constitute a concave and convex engaging portion.

[0041] The constituent members configured as described above include the holder main portion 39 and the locking sleeve 42. Push the holder main portion 39 into the through hole 37 from both end openings of the through hole 37. into the locking sleeve 42 to engage the locking groove 45 and the locking protrusion 46. At the same time, by fitting the flange 40 into the recess 41, The sensor 19 held by the holder main portion 39 is supported and fixed to the fixed ring 2.

[0042] In the case of this embodiment as well, the work of attaching and detaching the sensor 19 to the fixed ring 2 is performed by tightening the screw. It can be done easily and quickly without twisting or loosening.

[0043] Next, FIGS. 9 and 10 show a fourth embodiment of the present invention, which corresponds to the invention described in claim 4. An example is shown.

[0044] A mounting portion 3 fixed to the outer circumferential surface of the fixed ring 2 includes a mounting portion 3 that extends in the axial direction of the fixed ring 2. A hole 47 is formed. The holder 48 forming a part of the sensor 19 is connected to the through hole 47. has an outer diameter smaller than the inner diameter of the through hole 47, and the inner end thereof has a diameter smaller than the inner diameter of the through hole 47. A flange portion 49 having a large outer diameter is formed.

[0045] 51 is a locking tube, and this locking tube 51 has an inner diameter into which the holder 48 can be freely inserted and It has an outer diameter smaller than the inner diameter of the through hole 47. This locking tube 51 has an outer end portion The mounting flange 52 formed in the above is fixed to the outer surface of the mounting portion 3 with screws. Therefore, it is held concentrically inside the through hole 47.

[0046] The locking tube 51 has a diametrical direction (vertical direction in FIGS. 9 and 10) A plurality of holding holes 53, 53 are formed throughout. And each holding hole 53, 53 Locking spheres 54, 54 such as steel balls are held within the diaphragm so as to be freely displaceable in the diametrical direction. There is. Further, the outer circumferential surface of the intermediate portion of the holder 48 is engaged with the locking spheres 54, 54. A locking groove 55 having a V-shaped cross section is formed.

[0047] On the other hand, there is a gap between the outer peripheral surface of the locking tube 51 and the inner peripheral surface of the through hole 47. Pressure to press the ball stoppers 54, 54 in the direction of protruding inward from each holding hole 53, 53 We have measures in place. This pressing means is provided with a variable force inside the through hole 47 in the axial direction. The pressing sleeve 56 is fitted in a freely movable manner, and the pressing sleeve 56 is pressed inward. It is composed of a compression spring 57.

[0048] The inner diameter of the pressing sleeve 56 increases from the outside toward the inside. The locking spheres 54, 54 in contact with the inner circumferential surface of the pressing sleeve 56 are It is pressed diametrically inward from the holding holes 53, 53. Moreover, the flange portion 49 A small hole 58 is provided in a part of the press sleeve 56 that faces the inner edge of the press sleeve 56; A pin or the like inserted through this small hole 58 resists the elasticity of the compression spring 57 and The pressing sleeve 56 can be pressed outward.

[0049] The pressing sleeve 56 holds the holder 48 of the sensor 19 as shown in the figure. It is inserted into the locking cylinder 51, and the locking groove 55 and the locking spheres 54, 54 are engaged with each other. In this state, it is pushed inward by the elasticity of the compression spring 57 and engages with each of the locking spheres 54, 54. It functions to keep the stop groove 55 in the engaged state.

[0050] For this reason, the holder 48 of the sensor 19 is placed inside the through hole 47 as shown in FIGS. In the supported state, this holder 48 is firmly seated inside the through hole 47. The sensor 19 held at the outer end of the holder 48 remains in the held state. , is axially opposed to the inner surface of the pulse rotor 59 fixed to the outer peripheral surface of the intermediate portion of the hub 8. towards

[0051] Also, when removing the holder 48 from the mounting part 3, the pin inserted through the small hole 58 should be removed. The pressing sleeve 56 is pressed outward against the elasticity of the compression spring 57 by a spring or the like. Then, with the force pressing each locking sphere 54 diametrically inward released, remove the holder. 48 inwardly from the through hole 47.

[0052] Therefore, in the case of this embodiment as well, the work of attaching and detaching the sensor 19 to the fixed ring 2 is performed using screws. It can be done easily and quickly without tightening or loosening.

[0053] The rotational speed of the wheel is detected by the rotational speed detection bearing unit of the present invention. The action is the same as that of the conventional structure described above, so redundant explanation will be omitted. .

[0054]

[Effect of the idea]

The rotational speed detection bearing unit of the present invention is constructed and operates as described above. However, it is easy to attach and detach the sensor to the fixed ring, reducing the time required for attaching and detaching the sensor. It will be done.

[Brief explanation of drawings]

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

FIG. 2 is an exploded perspective view of essential parts.

FIG. 3 is a half sectional view showing a second embodiment of the present invention.

FIG. 4 is an exploded perspective view of essential parts.

FIG. 5 is a view of the inner end side opening of the through hole viewed from the direction of arrow A in FIG. 4;

FIG. 6 is a side view showing a state immediately before joining the holder main part and the cord.

FIG. 7 is a half sectional view showing a third embodiment of the present invention.

FIG. 8 is an exploded perspective view of the main parts.

FIG. 9 is a half sectional view showing a fourth embodiment of the present invention.

FIG. 10 is an enlarged sectional view of the main part.

FIG. 11 is a sectional view showing an example of a conventional structure.

FIG. 12 is an enlarged sectional view of section B in FIG. 11;

FIG. 13 is a view along arrow C in FIG. 12;

[Explanation of symbols]

1 Outer ring raceway 2 Fixed ring 3 Mounting part 4 Inner raceway 5 Inner circle 6 Cage 7 Rolling elements 8 hub 9 Pulse rotor 10 sensor 11 Through hole 12 Mounting plate 13 Screw 14 Notch part 14a Back side 15 Locking groove 16 Flange 17 Pulse rotor 18 Sealing material 19 Sensor 20 Holder 21 Elastic leg piece 22 Locking plate 23 Hook part 24 Holding plate part 25 Through hole 26 Inward flange-shaped part 27 Notch part 28 Holder main part 29 Small diameter section 30 Locking protrusion 31 Compression spring 32 Tsubabe 33 Stopper piece 34 Legs 35 Locking part 36 code 37 Through hole 38 slit 39 Holder main part 40 Tsubabe 41 Recess 42 Locking sleeve 43 Cylindrical part 44 Stopper 45 Locking groove 46 Locking protrusion 47 Through hole 48 Holder 49 Tsubabe 51 Locking tube 52 Mounting flange 53 Holding hole 54 Locking sphere 55 Locking groove 56 Pressure sleeve 57 Compression spring 58 Small hole 59 Pulse rotor

Claims (4)

[Scope of utility model registration request] 1. A fixed ring having a double-row outer ring raceway on its inner peripheral surface, a rotating ring having a double-row inner ring raceway facing the outer ring raceway on each outer peripheral surface, and rotating with the outer ring raceway of the fixed ring. A plurality of rolling elements provided between the inner raceway of the ring, a pulse rotor supported on the outer peripheral surface of the rotating ring, and a sensor supported by a part of the fixed ring and facing the pulse rotor. In the rotational speed detection bearing unit consisting of a mounting portion fixedly provided on the outer peripheral surface of the fixed ring, a notch portion formed on the outer peripheral edge of this mounting portion, and a portion closer to the inner periphery than the notch portion. A locking groove formed on the side surface of the mounting portion, a holder holding the sensor, an elastic leg protruding inward from the inner circumferential side of the holder, and an inner circumferential end of the elastic leg. and a hook portion formed in the notch portion, and with the holder inserted inside the notch portion, the hook portion at one end of the elastic leg is engaged with the locking groove, thereby fixing the sensor. A bearing unit for rotational speed detection characterized by being supported by a ring. 2. A fixed ring having a double-row outer ring raceway on an inner circumferential surface, a rotating ring having a double-row inner ring raceway facing the outer ring raceway on each outer circumferential surface, and rotating with the outer ring raceway of the fixed ring. A plurality of rolling elements provided between the inner raceway of the ring, a pulse rotor supported on the outer peripheral surface of the rotating ring, and a sensor supported by a part of the fixed ring and facing the pulse rotor. The rotational speed detection bearing unit comprises: a mounting portion fixed to the outer circumferential surface of the fixed ring; a through hole formed in the mounting portion extending in the axial direction of the fixed ring; an inward flange-shaped portion formed at an end portion, a notch portion formed at an inner peripheral edge of the inward flange-shaped portion, and a holder main portion that holds the sensor at one end and is freely insertable into the through-hole; A small diameter part that is continuously provided from the other end surface of the holder main part and that can be freely inserted into the inside of the inward flange-shaped part, and an engagement part that is provided on the outer peripheral surface of this small diameter part and that can be freely passed through the notch part. a compression spring provided around the small diameter portion and held between the inner surface of the inward flange portion and the other end surface of the holder main portion; and a compression spring provided on the outer circumferential surface of the holder main portion closer to one end. a flange having a non-circular outer circumferential shape; a locking groove formed on a side surface of the mounting portion; and a locking groove formed on a side surface of the mounting portion; and a detent piece having a hook portion that can be freely engaged with the locking groove, and when the holder main portion is rotated after the locking protrusion passes through the notch, A bearing unit for detecting rotational speed, characterized in that the sensor is supported on the fixed ring by fitting the piece to the outer peripheral edge of the mounting part to prevent the main part of the holder from rotating. 3. A fixed ring having a double-row outer ring raceway on an inner circumferential surface, a rotating ring having a double-row inner ring raceway facing the outer ring raceway on each outer circumferential surface, and rotating with the outer ring raceway of the fixed ring. A plurality of rolling elements provided between the inner raceway of the ring, a pulse rotor supported on the outer peripheral surface of the rotating ring, and a sensor supported by a part of the fixed ring and facing the pulse rotor. The rotational speed detection bearing unit includes a mounting portion fixed to the outer circumferential surface of the fixed ring, a through hole formed in the mounting portion in the axial direction of the fixed ring, and a through hole with the sensor attached to one end. a holder main part that is held in the holder and has an outer diameter smaller than the inner diameter of the through hole; a flange having a non-circular outer peripheral shape provided on the outer peripheral surface of the holder main part near one end; and a side surface of the mounting part. formed at the periphery of the opening at one end of the through hole,
a recess into which the flange can be fitted without rattling, a cylindrical part which can be inserted between the inner peripheral surface of the through hole and the outer peripheral surface of the holder main part, and an outer peripheral edge of the other end of the cylindrical part. A locking sleeve having a stopper formed therein; and a concave-convex engaging portion provided between an inner circumferential surface of the locking sleeve and an outer circumferential surface of the holder main portion, the holder main portion being inserted into the through hole. At the same time, with the flange fitted into the recess, the locking sleeve is pushed between the inner peripheral surface of the through hole and the outer peripheral surface of the holder main portion, thereby attaching the sensor to the fixed ring. A bearing unit for rotational speed detection characterized by support. 4. A fixed ring having a double-row outer ring raceway on an inner peripheral surface, a rotating ring having a double-row inner ring raceway facing the outer ring raceway on each outer peripheral surface, and rotating with the outer ring raceway of the fixed ring. A plurality of rolling elements provided between the inner raceway of the ring, a pulse rotor supported on the outer peripheral surface of the rotating ring, and a sensor supported by a part of the fixed ring and facing the pulse rotor. The rotational speed detection bearing unit includes a mounting portion fixed to the outer circumferential surface of the fixed ring, a through hole formed in the mounting portion in the axial direction of the fixed ring, and a through hole with the sensor attached to one end. a holder having an outer diameter smaller than the inner diameter of the through hole, and a holder provided at the other end of the holder;
The holder has a flange having an outer diameter larger than the inner diameter of the through hole, an inner diameter into which the holder can be freely inserted, and an outer diameter smaller than the inner diameter of the through hole, and is held concentrically inside the through hole. A locking cylinder, a holding hole formed in the diameter direction of the locking cylinder, a locking sphere held in the holding hole, and the above-mentioned holder in a state that can freely engage with the locking sphere. a locking groove formed on the outer peripheral surface of the locking tube, and a locking groove provided between the outer peripheral surface of the locking cylinder and the inner peripheral surface of the through hole, which presses the locking sphere in a direction protruding inward from the holding hole. the sensor is supported on the fixed ring by inserting the holder into the locking cylinder and engaging the locking groove with the locking sphere. Detection bearing unit.