JPH10319027A - Roller bearing unit with rotation speed detecting device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To easily and speedily perform connection and disconnection of a holder surrounding a sensor to/from a cover fixed to an outer wheel. SOLUTION: A holder 29a is inserted into a through hole 53 and a holding cylinder 54 provided on a cover 23a, and a collar part 62 and a tip end face of the holding cylinder 54 are abutted with each other. In this state, these collar part 62 and holding cylinder 54 are bonded by a bonding spring 57. By an O-ring 70, there is sealed between an inner periphery of the holding cylinder 54 and an outer periphery of the holder 29a. Before the O-ring 70 enters the holding cylinder 54, an engagement part for ensuring positioning over the circumferential direction of the holder 29a is provided between the cover 23a and the holder 29a.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION A rolling bearing unit with a rotation speed detecting device according to the present invention rotatably supports a wheel of an automobile with respect to a suspension device and is used for detecting the rotation speed of the wheel.

[0002]

2. Description of the Related Art In order to control an anti-lock brake device (ABS) or a traction control device (TCS), it is necessary to detect a rotation speed of a wheel rotatably supported by a suspension device. Various types of rolling bearing units with a rotational speed detector used for this purpose have been known in the past.However, as a structure for facilitating inspection and repair work by making it easy to attach and detach the sensor, For example, those described in U.S. Pat. No. 4,946,295 are known. FIG. 23 shows a rolling bearing unit with a rotation speed detecting device described in this specification.

[0003] An inner ring 1 which is a rotating wheel is an outer ring 2 which is a stationary wheel.
It is rotatably supported inside. For this purpose, an inner raceway 3 which is a rotating raceway surface is provided on an outer circumferential surface of the inner race 1 which is a rotating circumferential surface, and an outer raceway 4 which is a stationary raceway surface is provided on an inner circumferential surface of the outer race 2 which is a stationary circumferential surface. , Respectively. A plurality of rolling elements 5 are provided between the inner raceway 3 and the outer raceway 4. An annular encoder 6 is externally fitted and fixed to the outer peripheral surface of the end of the inner ring 1, and a seal ring 7 and a holding ring 8 are internally fixed to the inner peripheral surface of the end of the outer ring 2. That is, the locking projection 9 formed on the holding ring 8 is engaged with the locking recess 11 formed on the inner peripheral surface of the end of the outer ring 2 through the through hole 10 formed on the seal ring 7. The sensor 12 supported by the holding ring 8 is opposed to the side surface of the encoder 6. The magnetic characteristics of the side surface of the encoder 6 change alternately and at regular intervals in the circumferential direction. The output of the sensor 12 changes in accordance with the change in the magnetic characteristics. The frequency at which the output of the sensor 12 changes in this manner is proportional to the rotation speed of the inner ring 1. Therefore, if the output of the sensor 12 is input to the controller, ABS and TCS can be controlled.

In the case of the conventional structure shown in FIG. 23, the sensor 12 can be mounted on the end of the outer ring 2 which is a stationary wheel without using a special pushing jig or the like. There is no built-in structure to seal from outside. That is, the seal ring 7 separates the portion where the rolling elements 5 are installed from the outside, but does not separate the portion where the encoder 6 and the sensor 12 are installed from the outside. Therefore, at the time of rain or the like, there is a possibility that water droplets may remain in the minute gap 13 between the encoder 6 and the sensor 12. If the vehicle is started in a cold state with the water drops frozen, there is a possibility that one or both of the encoder 6 and the sensor 12 may be damaged.

[0005]

DESCRIPTION OF THE PRESENT INVENTION In view of such circumstances, the present inventor has previously invented a rolling bearing unit with a rotation speed detecting device as shown in FIGS. 24 to 27 (Japanese Patent Application No. 8-9836).
A wheel fixing flange 15 is provided on the outer peripheral surface of one end (left end in FIG. 24) of the hub 14 which is a rotating wheel, and an inner race which is a rotating raceway surface is provided at an intermediate portion of the outer peripheral surface which is a rotating peripheral surface. The track 3a is formed. Further, an inner ring 1a having an inner raceway 3b, which is also a rotation side raceway, is externally fitted to the other end of the outer circumference of the hub 14 (right end in FIG. 24). It is fixed. And the hub 14
A nut 17 is screwed into a male screw portion 16 formed at the other end of the inner ring 1a to hold down the inner ring 1a.

The outer ring 2a, which is a stationary wheel, has a mounting portion 18 for supporting a knuckle of a suspension device (not shown) on an outer peripheral surface, and double-row outer ring raceways 4a, 4b on an inner peripheral surface which is a stationary side peripheral surface. Respectively. A plurality of rolling elements 5, 5 are provided between the outer raceways 4a, 4b, which are stationary raceway surfaces, and the inner raceways 3a, 3b, respectively, and are supported by the mounting unit 18 on a suspension system. Outer ring 2
The hub 14 is rotatably supported inside a.
Although balls are shown as the rolling elements 5 and 5 in the illustrated example, tapered rollers may be used as rolling elements in the case of a heavy-duty rolling bearing unit for an automobile.

Further, an encoder 6a is externally fitted and fixed to a portion of the end of the inner ring 1a which is separated from the inner ring raceway 3b. The encoder 6a is formed by combining a support ring 19 and an encoder body 20. Support ring 1 of these
Reference numeral 9 denotes a metal plate such as a steel plate formed in an annular shape with an L-shaped cross section. The cylindrical portion 21 is externally fitted and fixed to the end of the inner ring 1a. And a circular ring portion 22 bent outward at a right angle. The encoder body 20 is attached to a side surface of the ring portion 22. The encoder body 20 is formed as a whole in a ring shape by a permanent magnet such as a rubber magnet into which ferrite powder is mixed, and is formed in an axial direction (the left-right direction in FIG.
It is magnetized over (vertical direction in FIG. 26). The magnetization direction is
They are alternately and equally spaced over the circumference. Therefore, on the side surface of the encoder main body 20, S poles and N poles are arranged alternately and at equal intervals.

A cover 2 is provided at the open end of the outer race 2a.
3 is externally fitted and fixed. The cover 23 is formed by subjecting a metal plate such as a steel plate, a stainless steel plate, and an aluminum alloy plate to plastic working such as drawing. The cover 23 is attached to the outer ring 2a on the periphery of the opening of the cover 23.
A fitting portion 24 for external fitting and fixing is provided at the opening end portion, and a bulging portion 25 for preventing interference with the nut 17 is provided at the center portion.
Are formed respectively. Further, a holding cylinder 27 is formed in a part of the intermediate part 26 located between the fitting part 24 and the bulging part 25. A holder 29 made of synthetic resin, in which the sensor 12a and an end of a harness 28 for extracting an output signal of the sensor 12a are embedded, is inserted into the holding cylinder 27.

The holding cylinder 27 is formed in a cylindrical shape having an axis substantially parallel to the axis of the hub 14 and the outer ring 2a, and communicates the inside and outside of the cover 23.
Also, at the two ends of the outer periphery of the opening (the right end in FIG. 24 and the lower end in FIG. 26) opposite to the diametric direction,
An outward flange-shaped flange portion 30 is formed.
A pair of locking projections 31, 31 are formed on the outer peripheral edge of the zero. Each of the locking projections 31, 31 is located at the base end (the left end in FIG. 24, FIG.
6 (upper end of 6).

On the other hand, the holder 29 is provided with the holding cylinder 2
7, a small-diameter portion 32 which can be inserted without any gap,
And a large-diameter portion 33 formed at the base end (right end in FIG. 24, lower end in FIG. 26). The small-diameter portion 32 and the large-diameter portion 33 are connected by a step 34. The step portion 34 faces the outer side surface (the right side surface in FIG. 24 and the lower surface in FIG. 26) of the flange portion 30 in a state where the small diameter portion 32 is inserted into the holding cylinder portion 27. Further, in this state, the sensor 12a faces the side surface of the encoder main body 20 constituting the encoder 6a in a state where the sensor 12a is embedded in the distal end portion (the left end portion in FIG. 24 and the upper end portion in FIG. 26) of the small diameter portion 32. I do. The harness 28 is led out of the holder 29 from the base end surface (the right end surface in FIG. 24 and the lower end surface in FIG. 26) of the large diameter portion 33.

A pair of elastic locking pieces 35, 35 are formed at two positions on the outer peripheral surface of the large diameter portion 33 on the opposite side in the diameter direction. Each of the elastic locking pieces 35, 35 is inclined in a direction toward the distal end (the left end in FIG. 24, the upper end in FIG. 26) of the small diameter portion 32 toward the distal end edge. or,
Locking holes 36, 36 are formed at the distal ends of the elastic locking pieces 35, 35, respectively. These locking holes 3
The pair of locking projections 3 are provided on the inside of the pair.
1 and 31 are large enough to be inserted. In addition, the distance between the distal ends of the elastic locking pieces 35 in the free state is slightly smaller than the distance between the distal edges of the pair of locking projections 31. Further, a corrugated spring 37 is sandwiched between the outer surface of the flange 30 and the step 34.

The corrugated spring 37, the pair of locking projections 31, 31, and the elastic locking pieces 35, 35 are engaged with each other to extend in the axial direction of the holder 29 with respect to the holding cylinder 27. The holder 29 is supported in the holding cylinder 27 for positioning. That is, when the corrugated plate spring 37 is externally fitted to the small-diameter portion 32, the small-diameter portion 32 is inserted into the holding cylinder portion 27, and the large-diameter portion 33 is pressed toward the holding cylinder portion 27. The corrugated spring 37 is elastically compressed between the flange 30 and the step 34. Then, while the corrugated spring 37 is elastically compressed, the locking holes 36, 36 formed in the pair of elastic locking pieces 35, 35 and the locking projections 31, 31 are engaged. In this state, the holder 29 is supported in the holding cylinder 27 in a state where positioning in the axial direction is achieved.

Further, a locking groove 38 is formed on the outer peripheral surface of the intermediate portion of the small diameter portion 32 over the entire circumference, and the outer peripheral edge of an O-ring 39 as a sealing member fitted in the locking groove 38 is formed. The inner peripheral surface of the holding cylinder 27 is elastically contacted over the entire circumference. The O-ring 39 constitutes a sealing means to prevent foreign matters such as rainwater from entering the cover 23 between the inner peripheral surface of the holding cylinder 27 and the outer peripheral surface of the holder 29.

In the case of the rolling bearing unit with the rotation speed detecting device as described above, the flange 1 provided at the end of the hub 14
The wheel fixed to 5 can be supported rotatably with respect to the suspension device supporting the outer wheel 2a. Further, when the encoder 6a rotates together with the inner ring 1a externally fitted and fixed to the end of the hub 14 along with the rotation of the wheel, the output of the sensor 12a facing the encoder body 20 constituting the encoder 6a changes. The frequency at which the output of the sensor 12a changes is
Since the output signal of the sensor 12a is input to a controller (not shown) via the harness 28 because the output signal is proportional to the rotation speed of the wheel, the rotation speed of the wheel can be obtained and the ABS and TCS can be appropriately controlled.

[0015] In the case of the rolling bearing unit with the rotation speed detecting device according to the prior invention configured as described above, the operation of rotatably supporting the wheel and the operation of detecting the rotation speed of the wheel are conventionally known. This is the same as the rolling bearing unit with the rotation speed detecting device. In particular, in the case of the rolling bearing unit with the rotation speed detecting device of the prior invention, the holder 23 in which the sensor 12a is embedded is fixed to the cover 23 in which the holder 29 is fixed to the outer ring 2a without using a special jig or the like. Can be attached to and detached from. That is, when the holder 29 is mounted on the cover 23, as described above, the small-diameter portion 32 of the holder 29 is inserted into the holding cylinder 27, and the pair of locking projections 31, 31 and the elastic locking pieces are provided. The large-diameter portion 33 is pressed against the holding cylinder portion 27 in a state where the phases of the large-diameter portions 33 and 35 in the circumferential direction are matched. Along with this pressing operation, the distal ends of the pair of elastic locking pieces 35, 35 are guided by the locking projections 31, 31, and are displaced in a direction in which the gap is increased. A locking hole 36 formed at the tip of each of the elastic locking pieces 35, 35,
In a state where the locking projections 36 are aligned with the locking projections 31, the elastic locking pieces 35, 35 are elastically restored (in a direction in which the interval between the distal ends is reduced), and the locking holes 36, 36 are restored. The locking projections 31, 31 enter the inside. In this state, since the corrugated plate spring 37 is elastically compressed,
When the force that has been pressed is released, each of the locking projections 3
The top edges of the first and 31 and the inner edges of the locking holes 36 and 36 elastically contact each other, and the holder 29 is mounted on the cover 23. Locking projections 31, 31 and elastic locking pieces 35, 35
Is provided at two positions on the opposite side in the diameter direction, so that the holder 2a does not tilt. Also, if the pair of elastic locking pieces 35, 35 are elastically displaced in a direction to widen the interval between the distal ends thereof, the distal edges of the locking projections 31, 31 and the locking holes 36, 36, the small diameter portion 32 can be pulled out of the holding cylinder 27.

Further, as described above, the holder 29 is
In a state where the small-diameter portion 32 is inserted into the holding tube portion 27 so as to be mounted on the holder 3, the space between the inner peripheral surface of the holding tube portion 27 and the outer peripheral surface of the small-diameter portion 32 is sealed by the O-ring 39.
Therefore, it is possible to prevent foreign matters such as rainwater from entering the cover 23 through the space between the two peripheral surfaces. As a result, it is possible to prevent the sensor 12a and the encoder 6a from being damaged by freezing.

[0017]

In the case of the rolling bearing unit with the rotation speed detecting device according to the preceding invention, which is constructed and operates as described above, particularly in view of the performance of detecting the rotation speed after assembly and maintaining the durability. Although there is no problem, improvement is desired in terms of assemblability. That is, the holder 29 is
, Each locking projection 31, 31 and each locking hole 36,
36, the holding cylinder 27 and the holder 29
And the phase in the circumferential direction must be matched.
The first half of the holder 29 (the left half of FIGS. 24 and 27, FIG. 2)
6 is inserted into the holding cylinder 27, if the locking projections 31, 31 and the locking holes 36, 36 are out of phase, the holder 29 is held. It must be rotated in the circumferential direction inside the cylindrical portion 27.

However, in this state, the holder 29
The O-ring 39 attached to the middle part of the holding cylinder 27 is elastically compressed between the bottom surface of the locking groove 38 and the inner peripheral surface of the holding cylinder 27. Outer peripheral surface of holder 29 and holding cylinder 2
The sealing means provided between the inner peripheral surface of the locking groove 38 and the inner peripheral surface of the locking groove 38 is required to have a high sealing property in order to prevent water from entering during running on rainy weather or during car washing. The force for elastically compressing the O-ring 39 between the O-ring 39 and the inner peripheral surface of the holding cylinder 27 is considerably large. Accordingly, the holder 29 is held in the holding cylinder 2 while the O-ring 39 is elastically compressed between the bottom surface of the locking groove 38 and the inner peripheral surface of the holding cylinder 27 in this manner.
The force required to rotate inside the shaft 7 becomes considerably large, and the assemblability of the rolling bearing unit with the rotation speed detecting device is deteriorated.

Considering only the assemblability of the rolling bearing unit with the rotation speed detecting device, the structure of the connecting portion for connecting the holder to the cover in a non-separable manner may be changed. In some cases, it is necessary to regulate the rotation speed detection device from the viewpoint of maintaining the performance. Such a case will be described with reference to FIGS. As shown in FIG. 28, an encoder 6b in which S poles and N poles are alternately arranged in the circumferential direction, and a pair of Hall elements 4
In the case of a rotational speed detecting device combining a sensor 12b in which 0 and 40 are arranged at predetermined intervals, or as shown in FIG. 29, an encoder 6c made of a magnetic material and having irregularities formed alternately in the circumferential direction. In the case of a rotational speed detecting device in which a pair of Hall elements 40 and 40 and a sensor 12c composed of a permanent magnet 41 arranged at a predetermined interval are combined, a pair of Hall elements constituting the respective sensors 12b and 12c 4
0 and 40 must be accurately arranged in the circumferential direction of the encoders 6b and 6c, respectively.

That is, the sensor 12 shown in FIGS.
The outputs f ₁ (t) and f ₂ (t) of the pair of Hall elements 40 and 40 constituting the b and 12c are as shown in FIGS. 30A and 30B, respectively, as the encoders 6b and 6c rotate. Changes to The output of each of the sensors 12b and 12c shown in FIG. 31 is the difference Δf ₁ (t) −f between the output of each of the Hall elements 40 and 40 shown in FIGS. 30 (A) and 30 (B). ₂ (t)｝. The outputs of the sensors 12b and 12c change based on the phase difference δ (FIG. 30) between the outputs f ₁ (t) and f ₂ (t) of the pair of Hall elements 40 and 40. When the phase difference δ is π radian (180 degrees), the outputs of the sensors 12b and 12c can be maximized. Therefore, in order to increase the output of each of the sensors 12b, 12c, the interval between the pair of Hall elements 40, 40 constituting each of the sensors 12b, 12c is separated by π radian, and the pair of Hall elements The elements 40, 40 need to be correctly arranged in the circumferential direction of each of the encoders 6a, 6b. The present invention has been made in view of such circumstances, and has been conceived to realize a structure capable of sufficiently securing the sealing performance of the mounting portion of the holder with respect to the cover and improving the assemblability of the holder with respect to the cover.

[0021]

A rolling bearing unit with a rotation speed detecting device according to the present invention has a stationary side raceway surface on a stationary side peripheral surface, similarly to a conventionally known rolling bearing unit with a rotation speed detecting device. A stationary wheel that does not rotate during use, a rotating wheel that has a rotating raceway surface on the rotating peripheral surface and rotates during use, and a plurality of rotating wheels provided between the stationary raceway surface and the rotating raceway surface. A rolling element, an encoder formed entirely in an annular shape, supported by the rotating wheel concentrically with the rotating wheel, and having a characteristic in a circumferential direction alternately and at equal intervals.
A cover fixed to an end of the stationary wheel and closing at least a part of an end opening of the stationary wheel; and a sensor supported by the cover and facing a flange surface of the encoder.

Further, in the rolling bearing unit with the rotation speed detecting device according to the present invention, like the rolling bearing unit with the rotating speed detecting device according to the prior invention shown in FIGS. The portion is formed with a through-hole communicating the inside and outside of the cover. The sensor is embedded in a synthetic resin holder that can be inserted into the through hole. In addition, a gap between the holder and the cover is closed between a part of the holder and a part of the cover to prevent foreign matter from entering the cover through the gap. A seal member is provided.

Further, in the case of the rolling bearing unit with the rotation speed detecting device according to the present invention, the portion extending from the holder and the cover to the portion deviating from the installation portion of the seal member extends in the circumferential direction of the holder. An engaging portion for positioning is provided. Then, the relationship between the installation position of the engagement portion and the installation position of the seal member is determined before the seal member is sandwiched between a part of the holder and a part of the cover. The engagement state restricts the positioning of the holder in the through hole in the circumferential direction.

[0024]

With the rolling bearing unit with the rotation speed detecting device of the present invention configured as described above, the wheel is rotatably supported with respect to the suspension device, and the operation itself when detecting the rotation speed of the wheel is as follows. The conventional structure shown in FIG.
Alternatively, it is also the same as the case of the structure according to the prior invention shown in FIGS.

In particular, in the case of the rolling bearing unit with the rotation speed detecting device according to the present invention, after the seal member is elastically compressed between a part of the holder and a part of the cover, the holder is inserted into the through hole. No need to rotate inside. That is, the engagement portion is engaged before the seal member is sandwiched between the part of the holder and the part of the cover, and the positioning of the holder in the through hole in the circumferential direction is performed. Plan. For this reason, after the seal member is elastically compressed between a part of the holder and a part of the cover, it is sufficient to push the holder into the through hole (in the through hole). There is no need to rotate the holder in the circumferential direction). For this reason, the work of attaching the holder to the cover can be made more efficient.

[0026]

1 to 8 show a first embodiment of the present invention. The feature of the present invention lies in the structure of a portion where a sensor is mounted on a cover fixed to an end of a stationary wheel constituting a rolling bearing unit. The structure and operation of the rolling bearing unit, which rotatably supports the rotating wheel with respect to the stationary wheel, are substantially the same as the structure of the prior invention shown in FIGS. The description will be omitted or simplified, and the following description will focus on the characteristic portions of the present invention and the portions different from the above-described structure of the prior invention.

The opening of the inner end (right end in FIG. 1) of the outer ring 2a, which is a stationary wheel, is closed by a cover 23a. The cover 23a includes a bottomed cylindrical main body 42 formed by injection molding of a synthetic resin, and a fitting cylinder 43 coupled to an opening of the main body 42. The fitting cylinder 43 is formed by plastically deforming a corrosion-resistant metal plate such as a stainless steel plate.
The fitting cylinder 44 has an L-shaped cross section, and includes a fitting cylinder 44 and an inward flange 45 bent radially inward from a base end (right end in FIG. 1) of the fitting cylinder 44. Such a fitting cylinder 43 is connected to the opening of the main body 42 by molding the inward flange 45 at the time of injection molding of the main body 42. The inward flange portion 45 has a large number of through holes 46, 46 formed intermittently in the circumferential direction.
The synthetic resin forming the main body 42 flows into the insides of the through holes 46, 46 at the time of injection molding of the main body 42, and increases the bonding strength between the main body 42 and the fitting cylinder 43.

The cover 23a constructed as described above is provided with the fitting tube portion 44 of the fitting tube 43 at the inner end of the outer ring 2a.
The inner end opening of the outer ring 2a is closed by fixing the outer ring with an interference fit. In this state, the end face of the opening of the main body 42, that is, the tip end face of the cylindrical wall portion 47 formed on the outer peripheral edge of the main body 42 is brought into contact with the inner end face of the outer ring 2a. A locking groove is formed all around the distal end surface of the cylindrical wall portion 47, and an O-ring 48 is locked in the locking groove. The tip surface of the cylindrical wall portion 47 and the outer ring 2
a in contact with the inner end surface of the O-ring 48.
Is elastically compressed between the inner end surface and the bottom surface of the locking groove to seal the joint between the cover 23a and the outer ring 1.

The inner ring 1a, which forms a rotating wheel together with the hub 14a, is fitted over the inner end of the hub 14a, and the inner end of the hub 14a is swaged radially outward to expand the hub 14a. It is fixed against. An encoder 6d is externally fitted and fixed to the inner end of the inner ring 1a (the end that is closer to the center in the width direction when assembled to the vehicle, and is the right end in FIG. 1). This encoder 6d has an SP
A magnetic metal plate such as CC is formed by bending to form an entire ring having an L-shaped cross section. A cylindrical portion 49 and a circular ring bent radially outward from an inner end edge of the cylindrical portion 49. A part 50. A plurality of slits 51, each having a slit shape, are formed radially at equal intervals in the circumferential direction in the annular portion 50 so that the magnetic characteristics of the annular portion 50 can be changed in the circumferential direction. They are changed alternately and at equal intervals.

A portion of the bottom plate portion 52 of the main body 42 constituting the cover 23a, which is opposed to the circular ring portion 50 of the encoder 6d, has an engagement groove 72 described later and has a circular cross section. A through hole 53 is formed. Further, a part of the outer surface (the right surface in FIG. 1) of the bottom plate portion 52 is provided with the through hole 5.
A cylindrical holding cylinder 54 is formed in a portion surrounding the opening 3. The inner peripheral surface of the base half portion (left half portion in FIG. 1) of the holding cylinder 54 and the inner peripheral surface of the through hole 53 have a single cylindrical surface having the engaging groove 72 or the engaging ridge, respectively. Make up. The inner diameter of the first half (the right half in FIG. 1) of the holding cylinder 54 is larger than the inner diameters of the base half and the through hole 53 to form a large diameter portion 55. The portion continuing from the through hole 53 is continuous by the step 56.

In the holding cylinder 54 as described above, a synthetic resin holder 29a in which a sensor is embedded is fitted with a pair of coupling springs 5a.
The joints 7 and 57 make it freely connectable and fixable. For this purpose, as shown in FIG. 5, two sets of pivot pieces 5 are provided at two positions on the opposite side of the outer circumferential surface of the holding cylinder 54 in the diametrical direction, respectively.
8, 58 are formed at intervals for each set. These two sets, a total of four pivot pieces 58, 58, are each formed in an arch shape, and inside each of them, pivot pieces 59, 59 formed at both ends of each coupling spring 57, described below,
It is pivotable. In addition, each of the pivot pieces 58, 58
A pair of coupling springs 5 pivotally supported on each of these pivot pieces 58, 58.
Of the outer peripheral surface of the holding cylinder 54, the holding cylinder 54 does not interfere with other components due to the swing around the pivot pieces 58, 58. It is provided on the opposite side in the circumferential direction.

As shown in FIG. 7, each of the pair of coupling springs 57, 57 has a straight holding portion 60 and a pair of pivot portions 59, 59, each of which is bent in a "U" shape. They are connected by elastic legs 61,61. These elastic legs 61, 61 are elastically deformed in the elongating direction when a force in the pulling direction is applied, and allow the restraining portion 60 and the pivot portions 59, 59 to separate from each other. The direction of the pair of pivots 59, 59 provided at both ends of the coupling springs 57, 57 is in the direction of the pivot pieces 58, 58 at which the pivots 59, 59 are to be pivoted. Together, they are inclined to each other. The pair of pivots 59, 59
Distance D ₅₉ in the free state of the tip portions of the is sufficiently larger than the pair of pivoting members 58, 58 spacing D ₅₈ between which is a pair (D _59> D _58).

On the other hand, as shown in FIGS. 6 and 8, parallel holding grooves 63 are formed on the base end surface of the flange 62 provided at the base end of the holder 29a so as to sandwich the harness 28 therebetween. doing. The retaining portions 60, 60 of the coupling springs 57, 57 can be freely engaged with these retaining grooves 63, 63 without backlash. In addition, inclined surfaces 64, 64 are formed in portions closer to the outer peripheral edge than the pressing grooves 63, 63 at positions opposite to the diameter direction of the base end surface of the flange portion 62, respectively.
The thickness of the flange 62 is made smaller toward the edge of the flange 62 from each of the holding grooves 63, 63.

The holder 29a is provided with the flange 62
And a columnar insertion portion 65 continuous from. The columnar insertion portion 65 includes a large diameter portion 66 provided on the base half side near the flange 62 and a small diameter portion 67 provided on the first half far from the flange 62 by a step 68. It is made continuous. Of the large diameter portion 66 and the small diameter portion 67, the large diameter portion 66 can be inserted into the large diameter portion 55 of the holding cylinder 54, and the small diameter portion 67 can be inserted into the through hole 53 without looseness. Have a diameter. A locking groove 69 is formed on the outer peripheral surface of the intermediate portion of the large diameter portion 66 of the holder 29a over the entire circumference, and an O-ring 70 as a sealing member is locked in the locking groove 69. ing. The outer diameter of the O-ring 70 is equal to the diameter of the large-diameter portion 55 of the holding cylinder 54 in a free state while being locked in the locking groove 69.
Larger than the inner diameter of On the other hand, when the large-diameter portion 66 is inserted into the large-diameter portion 55 of the holding cylinder 54, the O-ring 70 is in contact with the inner peripheral surface of the large-diameter portion 55 and the bottom surface of the locking groove 69. Between the holder 29
a and the cover 23a are sealed.

Further, a part of the small-diameter portion 67, which is a portion deviating from the installation portion of the O-ring 70, is attached to the portion shown in FIG.
Are formed over the small diameter portion 67 in the axial direction. In addition, FIGS. 3 and 4 show a part of the inner peripheral surface of the through hole 53 and the inner peripheral surface of the holding cylinder 54 which constitute a single cylindrical surface with the inner peripheral surface of the through hole 53. As shown, an engagement groove 72 for engaging the engagement ridge 71 without play is formed in the axial direction of the through hole 53 and the holding cylinder 54. The engaging ridge 71 and the engaging groove 72
Form an engaging portion for engaging the holder 29a in the circumferential direction by engaging with each other. still,
Contrary to the illustrated example, the engaging protrusion 71 may be provided on the inner peripheral surface of the holding cylinder 54, and the engaging groove 72 may be provided on the outer peripheral surface of the holder 29a.

In any case, the relationship between the installation position of the engagement ridge 71 and the engagement groove 72 constituting such an engagement portion and the installation position of the O-ring 70 is regulated.
Are the bottom surface of the locking groove 69 and the large-diameter portion 55 of the holding cylinder 54.
The engaging ridges 61 and the engaging grooves 72 are in an engaged state before being sandwiched between the inner peripheral surfaces of the ridges. For this reason, in the illustrated example, the holder 29a is
a, a distance L ₁ from the step 56 formed on the inner peripheral surface of the holding cylinder 54 to the tip end surface of the holder 29.
The flange 6 provided on the holder 29a from the side edge (left side edge in FIG. 1) of the locking groove 69 on which the O-ring 70 is mounted, to the front end.
2 is larger than the distance L ₂ to the inner surface (L ₁ > L ₂ )
doing. Therefore, in the case of this example, if the engaging ridge 71 and the engaging groove 72 are not engaged with each other before the O-ring 70 is pushed into the large-diameter portion 55, the holder 29a With the holding cylinder 54 and the through hole 5
3 cannot be inserted. As a result, the O-ring 70
Before the through hole 53 and the holding cylinder 54 are held between the bottom surface of the locking groove 69 and the inner peripheral surface of the large diameter portion 55.
The positioning of the holder 29a in the circumferential direction in the inside can be surely achieved. Therefore, after the O-ring 70 is sandwiched between the bottom surface of the locking groove 69 and the inner peripheral surface of the large-diameter portion 55 of the holding cylinder 54 and is elastically compressed, the O-ring 70 penetrates the holder 29a. It suffices if the work of pushing into the hole 53 and the holding cylinder 54 is performed. Therefore, the work of attaching the holder 29a to the cover 23a can be performed efficiently.

The holder 29a as described above is attached to the holding cylinder 5
In order to hold and fix the inside of the pair 4, the pivot portions 59, 59 of the pair of coupling springs 57, 57 are engaged with the pair of pivot pieces 58, 58, respectively. This engagement operation can be easily performed in a large space. Then, the pair of coupling springs 57, 57 are swingably displaced to the side of the holding cylinder 54, and the holding portions 60, 60 of the coupling springs 57, 57 are retracted from the opening of the holding cylinder 54. In this state, the columnar insertion portion 65 of the holder 29a is inserted into the inside of the holding tube 54 and into the through hole 53, and the flange 62 is brought into contact with the distal end surface of the holding tube 54. In this process, the engaging ridge 71 and the engaging groove 72 engage with each other as described above, and positioning of the holder 29a in the circumferential direction is achieved.

As described above, while positioning the holder 29a in the circumferential direction, with the flange 62 abutting on the distal end surface of the holding cylinder 54, the holder 29a
The dimensions of each part are adjusted so that a minute gap of a desired size exists between the detection part provided on the tip end surface of the cylindrical insertion part 65 constituting the above and the inner surface of the circular ring part 50 constituting the encoder 6d. Regulating. A gap is also provided between a step 68 formed in the middle of the cylindrical insertion portion 65 of the holder 29a and a step 56 formed in the inner peripheral surface of the middle of the holding cylinder 54. Next, the pair of coupling springs 57,
Each of the holding portions 60, 60 is pivotally displaced in a direction to approach the flange portion 62, and the holding portions 60, 6
0 and a pair of holding grooves 6 formed on the base end face of the flange 62.
3, 63 are engaged. At this time, each of the holding parts 60,
The elastic legs 61, 61 are elastically extended based on the engagement of the inclined surfaces 64, 64 with the respective inclined surfaces 64, 64. Then, in a state where the respective holding portions 60, 60 are aligned with the holding grooves 63, 63, the entire lengths of the elastic legs 61, 61 are elastically reduced, and the respective holding portions 60, 60 and the holding grooves 63, 63 are contracted. Are kept engaged. In addition, based on the positioning of the holder 29a in the circumferential direction based on the engagement between the engaging ridge 71 and the engaging groove 72, the phases of the holding portions 60, 60 and the holding grooves 63, 63 are also correct. Regulated.

In the illustrated example, the flange 62 of the holder 29a is brought into contact with the distal end surface of the holding cylinder 54, and these flanges 6
The position where the holder 2 abuts on the holding cylinder 54, that is, the position on one side of the flange 62 is used as a reference plane for die processing used when injection molding the holder 29a with synthetic resin. A gap is interposed between the step 68 formed in the middle of the holder 29a and the step 56 formed on the inner peripheral surface of the holding cylinder 54. However, on the contrary, the step 6
By having a structure in which the holders 8 and 56 are brought into contact with each other, the step portion 68 can be used as a reference surface for die processing used when the holder 29a is injection-molded with synthetic resin. In this case, a gap is provided between the flange 62 and the tip end surface of the holding cylinder 54a. In any case, if a part of the holder 29a, which is separated from a portion near the front end of the holder 29a, is brought into contact with the peripheral edge of the opening of the holding cylinder 54a or the through hole 53, the axial direction of the holder 29a ( (Insertion direction).

Further, the holder 29 is separated from the cover 23a.
To remove a, the connecting springs 57 are pivotally displaced to the side of the holding cylinder 54 in the opposite direction to the mounting operation, and the holding portions 60 of the connecting springs 57
60 is removed from each of the holding grooves 63, 63. In this manner, the holding portions 60, 60 are removed from the holding grooves 63, 63, and the holding portions 60, 60 are removed from the holding cylinder 5.
4 and then the cylindrical insertion portion 65 of the holder 29a is inserted into the inside of the holding cylinder 54 and the through-hole 5.
3 Remove from inside. In the case of the present embodiment configured and operated as described above, the time required for the work of attaching and detaching the holder 29a to and from the cover 23a is reduced, and the cost of the rolling bearing unit with the rotation speed detecting device itself and the cost required for repair are reduced. Can be reduced.

In the case of this embodiment, a small-diameter stepped portion 73 is formed over the entire circumference at the portion of the inner end of the inner ring 1a constituting the rotating wheel together with the hub 14a and deviating in the axial direction from the inner ring raceway 3b. It is formed concentrically with the inner ring 7a. And this step 7
3, a cylindrical portion 49 constituting the encoder 6d is externally fitted and fixed. The reason for forming such a step 73 is to make the encoder 6d face the distal end surface of the columnar insertion portion 65 constituting the holder 29a without increasing the diameter of the cover 23a. That is, even when a large thrust load or moment load is applied to the rolling bearing unit, the rolling elements 5, 5 are prevented from coming off the inner raceway 3b provided on the outer peripheral surface of the inner race 1a. It is necessary to form a shoulder 74 having a sufficiently large outer diameter at a portion of the inner end that is deviated in the axial direction from the inner raceway 3b. On the other hand, in order to detect the rotational speed of the rotating wheel, it is necessary to make the circular ring portion 50 constituting the encoder 6d face the distal end face of the columnar insertion portion 65 where the sensor detecting section is located. When the cylindrical portion 49 that constitutes the encoder is externally fitted to the shoulder portion 74 itself, the diameter of the annular portion 50 becomes larger than necessary, and the cover 23a that supports and fixes the holder 29a that faces the annular portion 50 is formed. The diameter may also be larger than necessary. On the other hand, if the above-described stepped portion 73 is provided, and the encoder 6d is externally fitted and fixed to the stepped portion 73, it is possible to prevent the diameter of the encoder 6d and the cover 23a from becoming unnecessarily large, This can contribute to the realization of a compact rolling bearing unit with a rotation speed detecting device.

Further, in the case of the illustrated example, the hub 14
The inner ring 1a is formed on the hub 14a by forming a cylindrical portion 75 at the inner end of the inner ring 1a and expanding the portion projecting from the inner end surface of the inner ring 1a radially outward at the tip of the cylindrical portion 75. On the other hand, it is fixed. By employing such a structure, the number of parts can be reduced and the labor for assembling can be reduced as compared with the structure in which the inner ring and the hub are connected and fixed by a nut as in the structure according to the prior invention shown in FIG. Thus, cost can be reduced. When the distal end portion of the cylindrical portion 75 is swaged outward in the diametrical direction, a force directed diametrically outward is applied to a part of the inner ring 1a. When this load is large, the diameter of the inner raceway 3b changes, and the rolling elements 5,
It is conceivable that the preload applied to 5 changes. However, in the case of the present example, the force accompanying the above-mentioned swaging is applied to the stepped portion 7.
3, and this force is hardly applied to the inner raceway 3b. Therefore, the preload hardly changes.

FIG. 9 shows a second embodiment of the present invention.
An example is shown. In the case of this example, an engaging ridge 71 for forming the engaging portion is a part of the small-diameter portion 67 of the cylindrical insertion portion 65 provided on the holder 29a, and a tip portion of the small-diameter portion 67 (see FIG. 9 at the left end). However, the distal end position of the engaging ridge 71 is the O
Before the ring enters the inside of the inner peripheral surface on the cover side, it is regulated to a position where it can enter the engagement groove 72 (FIGS. 3 and 4) formed on the cover side. Although not shown, the engagement protrusion may be provided only on the distal end side of the small-diameter portion 67 of the columnar insertion portion 65. Other configurations and operations are the same as those of the first example of the above-described embodiment.

Next, FIGS. 10 to 13 show a third embodiment of the present invention. In the case of this example, the cover 23
The inner diameter of the holding cylinder 54a formed on the outer surface of the through hole 53a is the same as the inner diameter of the through hole 53 over substantially the entire length. However, a mortar-shaped inclined portion 76 is formed on the periphery of the opening of the holding cylinder 54. The inclined portion 76 and the holder 29b
The O-ring 70 is elastically held between the base end outer peripheral surface of the cylindrical insertion portion 65a and one side surface of the flange portion 62. In the case of this example, the inclined portion 76 corresponds to a part of the cover 23a. Also in the case of the present example, the engaging ridge 71 and the engaging groove are provided before the O-ring 70 is sandwiched between the outer peripheral surface of the base end of the cylindrical insertion portion 65a and the inclined portion 76. 72 and the through-hole 53 and the holding cylinder 54a.
The positioning of the holder 29b in the circumferential direction can be reliably achieved. Therefore, the work of attaching the holder 29b to the cover 23a can be performed efficiently.

The position of the O-ring 70 in contact with the inclined portion 76 is diametrically outside the end opening of the engagement groove 72 and the diameter of the O-ring 70 and the engagement groove. 72 are regulated. Therefore, the above O
The ring 70 and the inclined portion 76 are in constant contact with each other over the entire circumference of the O-ring 70 and the inclined portion 76. Therefore, based on the existence of the engagement groove 72, the O-ring 70
The sealing performance of the part where the is installed is not impaired.
Further, if a mold for injection-molding the holder 29b with synthetic resin is formed so as to be divided in the radial direction of the cross section, the locking ridge 71 is formed into a cylindrical insertion portion 65a as shown in FIG. It is also possible to form a shape that exists only in the middle part of the above by only injection molding of a synthetic resin (without subsequent cutting). Other configurations and operations are the same as those of the first example of the above-described embodiment, and illustration and description of the equivalent parts will be omitted or simplified.

Next, FIGS. 14 to 22 show a fourth example of the embodiment of the present invention. In the case of this example, the cover 23
The main body 42a made of a synthetic resin constituting b is formed in an L-shaped cross section over the entire circumference. That is, while the structures of the first to third examples described above implement the present invention in a rolling bearing unit for supporting a non-driving wheel, the present example employs a rolling bearing unit for supporting a driving wheel. Next, the present invention is implemented. In the case of such a structure of this example, the hub 14c
Is connected to a constant velocity joint 93 to be freely rotatable. In particular, in the case of this example, a portion of the cylindrical wall portion 47a constituting the cover 23b is made thick, and a through hole 53a is formed in the thick portion in the diameter direction of the cover 23b. In the case of this example, as shown in FIGS. 16 to 18, the cross-sectional shape of the through-hole 53 a is a non-circular shape such as a rectangular shape in the inner half 77, and the cross-sectional shape of the outer half 78 is circular. In accordance with this, the holder 29 to be attached to the cover 23b
The cross-sectional shape of c is a non-circular shape such as a rectangle at the first half 79 located on the inner diameter side portion and a circular shape at the base end portion 80 located on the outer diameter side portion. A locking groove 69 is formed on the outer peripheral surface of the intermediate portion of the base end portion 80, and the O
The ring 70 is connected to the bottom surface of the locking groove 69 and the through hole 53.
The elastic compression is performed between the outer peripheral surface of the holder 29c and the inner peripheral surface of the through-hole 53a.

In the case of this embodiment, before the O-ring 70 enters the through hole 53a, the holder 29
The first half 79 of c enters the inner half 77 of the through-hole 53a so as to position the holder 29c in the circumferential direction. For this reason, with the holder 29c attached to the cover 23b, the through-hole 53a
From the step 56a formed in the middle of the inner peripheral surface of the holder 2
The distance L ₁ ′ to the front end surface of the lock groove 9c is determined by the side edge near the front end of the locking groove 69 in which the O-ring 70 is mounted (the lower side edge in FIG. 14)
It is' significantly (L ₁ than '> L _2') a distance L ₂ to the inner surface of the flange portion 62 provided in the holder 29c from.

Therefore, in the case of this embodiment, the O-ring 70
If the first half 79 and the inner half 77 are not engaged with each other before pushing the inside of the outer half 78, the holder 29c cannot be inserted into the through hole 53a any more. . As a result, before the O-ring 70 is sandwiched between the bottom surface of the locking groove 69 and the inner peripheral surface of the outer diameter half 78, the circumference of the holder 29c in the through hole 53a is reduced. Positioning in the direction can be ensured.
Therefore, after the O-ring 70 is sandwiched between the bottom surface of the locking groove 69 and the inner peripheral surface of the outer diameter half portion 78 and is elastically compressed, the holder 29c is inserted into the through hole 53.
It suffices if the work of pushing it into a is performed. Therefore, the work of mounting the holder 29c on the cover 23b can be performed efficiently.

A retaining groove 63a and an inclined surface 64 are formed on the proximal end surface of the flange 62 formed at the proximal end of the holder 29c. In a state where the holder 29c is fixedly connected to the cover 23b, a pressing portion 60 of a connecting spring 81 described below is engaged with the pressing groove 63a, and presses the flange portion 62 to the outer peripheral surface of the cylindrical wall portion 47a. . As shown in FIG. 20, the coupling spring 81 used in this embodiment includes the above-described holding portion 60 provided at the center and the pivot-shaped locking legs 8 provided at both ends.
2 and 82 are connected by substantially quadrant connecting portions 83 and 83. The locking legs 82 are bent in opposite directions from the ends of the connecting portions 83 and are coaxial with each other.

In order to pivotally support the locking legs 82, a part of the outer surface of the step portion 84 provided on the cover 23b is formed on the opposite side in the diametrical direction about the through hole 53a.
A hook-shaped pivot 85 is formed at each location. In the free state of the coupling spring 81, the distance D82 between the tips of the locking legs 82, ₈₂ is sufficiently larger than the distance D85 (not shown) between the pair of pivots _85. (D ₈₂ > D ₈₅ ). Also, each of these pivots 85
Only the side opposite to the through hole 53a is open. Therefore, when the locking legs 82 are locked to the pivots 85, the locking legs 82 do not shift toward the through hole 53a. In addition, each of the locking legs 82,
The pivot portion for pivoting 82 is not limited to the hook shape as shown, but may be a gate shape, a hole shape, or the like. Also, contrary to the example shown in the figure, it is also possible to bend each of the locking legs in a direction approaching each other from the ends of the pair of connecting portions and to arrange them coaxially with each other. In such a case, each of the locking legs is inserted into a pivot provided on the cover from the outside in the diameter direction of the cover.

The bottom plate 5 constituting the cover 23b
In the part of the outer surface of 2 that matches the through hole 53a,
A locking hook 86 for locking the holding part 60,
When the cover 23b is injection-molded with a synthetic resin, it is formed integrally. The coupling spring 81 is a manufacturer of a rolling bearing unit, and is mounted on the cover 23b in a state shown in FIG. That is, each of the locking legs 8
2 and 82 are locked to the respective pivot portions 85, and the holding portions 60 are locked to locking hooks 86. In this state, the holding portion 60 is retracted from the opening of the through-hole 53a, and prevents the first half 79 and the base end 80 of the holder 29c from being inserted into the through-hole 53a. No. In such a state, the connection spring 81
Does not project diametrically outward from the outer peripheral surface of the cover 23b. For this reason, while this coupling spring 81 inserts the cover 23b into the support hole of the knuckle (not shown),
There is no hindrance to the operation of supporting the rolling bearing unit with the rotation speed detecting device on the suspension system of the vehicle.

An inclined edge 87 is formed on a part of the locking hook 86 so that the holding portion 60 can be connected to the locking hook 86.
It can be easily locked. In the illustrated example, the locking hook 86 and the U-shaped curved portion 88 of the holding portion 60 constituting the coupling spring 81 are engaged. However, it is also possible to make the pair of linear portions 89, 89 provided so as to sandwich the curved portion 88, which constitutes the holding portion 60, engage with the locking hook 86. In this case, a pair of locking hooks are provided at intervals.

In order to hold and fix the holder 29c to the cylindrical wall portion 47a constituting the cover 23b constructed as described above using the coupling spring 81 also constructed as described above, the holding of the coupling spring 81 is suppressed. As shown in FIG. 21, the first half 79 and the base end 80 of the holder 29 c are connected to the cylindrical wall 4 with the part 60 retracted from the through hole 53 a.
It is inserted into the through hole 53a formed in 7a from the outside in the diameter direction to the inside. In the initial stage of the insertion operation, the first half 79 of the holder 29c is connected to the inner half 7 of the through hole 53a.
7, the holder 29c is positioned in the circumferential direction. Then, from this state, the holder 2 is further moved.
9c is pushed into the through hole 53a, and the flange 62 is brought into contact with the outer peripheral surface of the thick portion of the cylindrical wall 47a.
Next, the holding portion 60 of the coupling spring 81 is detached from the locking hook 86, and the coupling spring 81 is disengaged from each of the locking legs 8.
By swinging about the reference numerals 2 and 82 in the counterclockwise direction in FIG. 21, the pressing portion 60 rides on the base end surface of the flange portion 62. Then, the holding portion 60 is engaged with a holding groove 63 a formed on the base end surface of the flange portion 62. Incidentally, the coupling spring 81 used for implementing the present invention is preferably made of non-magnetic stainless steel. This is because disturbance magnetic flux is not collected around the sensor embedded in the holder, and the corrosion resistance is good.

Also in the case of such a structure of this embodiment, the labor required for attaching and detaching the holder 29c to and from the cover 23b is reduced, and the cost of the rolling bearing unit with the rotation speed detecting device itself and the cost for repair are required. Cost can be reduced. Also, after the O-ring 70 is sandwiched between the bottom surface of the locking groove 69 and the inner peripheral surface of the outer diameter side half 78, it is not necessary to rotate the holder 29c in the circumferential direction. The work of attaching the holder 29c to the cover 23b can also be performed efficiently. In the case of the structure of the present example, the outer diameter side half of the core 91 forming the seal ring 90 is embedded in the inner peripheral edge of the annular bottom plate 52a forming the cover 23b. A distal end edge of a seal lip 92 attached to the inner peripheral edge portion 91 over the entire circumference is brought into sliding contact with the outer peripheral surface of the constant velocity joint 93. In the case of the present example, the seal lip 92 prevents foreign matter from entering the space where the rolling elements 5 and 5 are installed.

A feature of the present invention lies in that the holder is positioned in the circumferential direction with respect to the cover before the sealing member such as the O-ring is sandwiched between the peripheral surfaces. Therefore, the present invention is not limited to the structure shown in each of the illustrated examples, but may be implemented by, for example, the structure shown in FIGS.

[0056]

The rolling bearing unit with the rotation speed detecting device of the present invention is constructed and operates as described above.
A structure can be realized in which the work of attaching and detaching the holder in which the sensor is embedded to and from the cover can be easily performed, and the damage of the sensor and the encoder due to freezing of water droplets can be prevented. or,
When the holder is mounted on the cover, it is not necessary to rotate the holder in the circumferential direction against the frictional force of a seal member such as an O-ring, so that the mounting operation can be performed efficiently and easily.

[Brief description of the drawings]

FIG. 1 is a partial cross-sectional view showing a first example of an embodiment of the present invention.

FIG. 2 is a perspective view showing only a holder to be incorporated in the first example.

FIG. 3 is a perspective view showing only a cover taken out.

FIG. 4 is an end view of a holding cylinder portion provided on the outer surface of the cover.

FIG. 5 is a perspective view of the same.

FIG. 6 is a partial perspective view of the same holder viewed from a direction opposite to that of FIG. 2;

FIG. 7 is a perspective view of a coupling spring incorporated in the first example.

FIG. 8 is a partial perspective view showing a state in which the cover and the holder are similarly coupled by a coupling spring.

FIG. 9 is a perspective view of a holder incorporated in a second example of the embodiment of the present invention.

FIG. 10 is a partial sectional view showing the third example.

FIG. 11 is a perspective view showing only a holder to be incorporated in the third example.

FIG. 12 is a perspective view showing only the cover.

FIG. 13 is an end view of a holding cylinder portion provided on the outer surface of the cover.

FIG. 14 is a partial sectional view showing a fourth example of the embodiment of the present invention.

FIG. 15 is a perspective view showing only a holder to be incorporated in the fourth example.

FIG. 16 is a partial perspective view showing only the cover.

FIG. 17 shows a through hole also provided on the outer surface of the cover in FIG.
The end view seen from the upper part of FIG.

FIG. 18 is a perspective view showing the overall shape of the cover.

FIG. 19 is a perspective view of the holder as viewed from the opposite direction to FIG. 15;

FIG. 20 is a perspective view of the coupling spring.

FIG. 21 is a side view showing a state where the coupling spring is mounted on a cover.

FIG. 22 is an enlarged view of a portion A in FIG. 21;

FIG. 23 is a partial cross-sectional view showing one example of a conventional structure.

FIG. 24B shows an example of a structure according to the prior invention, FIG.
-B sectional drawing.

FIG. 25 is a view seen from the right side of FIG. 24;

FIG. 26 is an enlarged cross-sectional view taken along the line CC of FIG. 24;

FIG. 27 is an exploded perspective view of a cover and a sensor constituting the structure according to the prior invention.

FIG. 28 is a schematic view showing a first example of a basic structure of a rotation speed detecting device.

FIG. 29 is a schematic view showing the second example.

FIG. 30 is a diagram showing signals output from a pair of Hall elements constituting the sensor.

FIG. 31 shows a combination of signals output from a pair of Hall elements.
FIG. 4 is a diagram illustrating an output signal of a sensor.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1, 1a Inner ring 2, 2a Outer ring 3, 3a, 3b Inner ring track 4, 4a, 4b Outer ring track 5 Rolling element 6, 6a, 6b, 6c, 6d Encoder 7 Seal ring 8 Retaining ring 9 Locking projection 10 Through hole 11 Stop recess 12, 12 a, 12 b, 12 c Sensor 13 Gap 14, 14 a, 14 c Hub 15 Flange 16 Male screw part 17 Nut 18 Mounting part 19 Support ring 20 Encoder main body 21 Cylindrical part 22 Ring part 23, 23 a, 23 b Cover 24 Fitting Part 25 Swelling part 26 Intermediate part 27 Holding cylinder part 28 Harness 29, 29a, 29b, 29c Holder 30 Flange part 31 Locking projection 32 Small diameter part 33 Large diameter part 34 Step 35 Elastic locking piece 36 Locking hole 37 Wave Leaf spring 38 Locking groove 39 O-ring 40 Hall element 41 Permanent magnet 42, 42a Main body 43 Fitting tube 44 Fitting tube portion 4 5 Inward flange portion 46 Through hole 47, 47a Cylindrical wall portion 48 O-ring 49 Cylindrical portion 50 Ring portion 51 Through hole 52, 52a Bottom plate portion 53, 53a Through hole 54, 54a Holding cylinder 55 Large diameter portion 56, 56a Step portion 57 Coupling spring 58 Pivot piece 59 Pivot part 60 Suppression part 61 Elastic leg part 62 Flange part 63, 63a Suppression groove 64 Inclined surface 65, 65a Columnar insertion part 66 Large diameter part 67 Small diameter part 68 Step part 69 Lock groove 70 O-ring 71 Locking ridge 72 Engagement groove 73 Stepped portion 74 Shoulder 75 Cylindrical portion 76 Inclined portion 77 Inner diameter half 78 External diameter half 79 First half 80 Base end 81 Coupling spring 82 Locking leg 83 connecting part 84 step part 85 pivot part 86 locking hook 87 inclined green 88 curved part 89 linear part 90 seal ring 91 core metal 92 seal lip 93 constant velocity joint

Claims (1)

[Claims] 1. A stationary wheel having a stationary raceway surface on a stationary peripheral surface and not rotating during use, a rotating wheel having a rotational raceway surface on a rotary side peripheral surface and rotating during use, and the stationary raceway And a plurality of rolling elements provided between the surface and the rotation-side raceway surface, the whole being formed in an annular shape, supported concentrically with the rotating wheel by the rotating wheel, and alternately having characteristics in the circumferential direction. Encoders changed at equal intervals, and a cover fixed to an end of the stationary wheel and closing at least a part of an end opening of the stationary wheel,
In a rolling bearing unit with a rotation speed detecting device provided with a sensor opposed to a flange surface of the encoder while being supported by the cover, a through-hole for communicating the inside and outside of the cover is formed in a part of the cover. The sensor is embedded in a synthetic resin holder that can be inserted into the through hole, and between the part of the holder and the part of the cover, the holder and the cover are disposed. And a seal member for preventing foreign matter from entering the cover through the gap is provided between the holder and the cover. An engagement portion for positioning the holder in the circumferential direction is provided in a portion deviated from the holder, and the seal member is sandwiched between a part of the holder and a part of the cover. Because In order to position the holder in the through-hole in the circumferential direction with the engagement portion in the engaged state, the relationship between the installation position of the engagement portion and the installation position of the seal member is regulated. Rolling bearing unit with rotation speed detector.