JP2000258447A - Rolling bearing unit with rotational speed detecting device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To inexpensively realize a structure capable of executing easily the mounting and removal of a sensor relative to a cover. SOLUTION: A sensor 4a is supported through a holding cylinder 34 made of a synthetic resin, inside a through hole 33 formed on a blocking plate part 29 composing a cover 17a made of a metal plate. The holding cylinder 34 is made separately from the cover 17a and thereafter placed in the through hole 33. Mounting and removal of the sensor 4a relative to the holding cylinder 34 are executed based on engagement and separation between an engaging projection 50 formed on the circumferential face of the holding cylinder 34 and a blocking piece 46 installed on the base end part of the sensor 4a.

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 Rolling bearing units are used to rotatably support the wheels of an automobile with respect to a suspension system.
Further, in order to control an antilock brake system (ABS) or a traction control system (TCS), it is necessary to detect the rotation speed of the wheel. For this reason, by the rolling bearing unit with the rotation speed detection device that incorporates the rotation speed detection device in the rolling bearing unit,
In recent years, it has been widely practiced to rotatably support the wheel with respect to a suspension device and detect the rotation speed of the wheel.

FIGS. 14 and 15 show an example of a conventional structure of a rolling bearing unit with a rotation speed detecting device used for such a purpose, which is described in Japanese Utility Model Laid-Open Publication No. Hei 7-31539. This rolling bearing unit with a rotation speed detecting device is an outer ring 1 which is a stationary wheel which does not rotate even during use.
A hub 2, which is a rotating wheel that rotates during use, is rotatably supported on the inner diameter side of the hub. The rotation speed of the encoder 3 fixed to a part of the hub 2 can be detected by the sensor 4 supported on the outer ring 1. That is, double rows of outer raceways 5, 5 are provided on the inner peripheral surface of the outer race 1.
An inner ring raceway 8 is provided on the outer peripheral surface of the hub 2 and the outer peripheral surface of an inner ring 7 which constitutes the rotating wheel together with the hub 2 in a state where the outer ring is fitted to the hub 2 and fixed to the hub 2 by a nut 6. , 8 are provided. A plurality of rolling elements 9, 9 are provided between the inner raceways 8, 8 and the outer raceways 5, 5, respectively, in such a manner that the rolling elements 9, 9 are held by the retainers 10, 10 so as to freely roll. The hub 2 and the inner ring 7 are rotatably supported inside the outer ring 1.

At the outer end of the hub 2 (the end that is outward in the width direction when assembled to an automobile, the right end in FIG. 14), it protrudes axially outward from the outer end of the outer race 1. A flange 11 for attaching a wheel is provided in the portion which has been set. Also, the inner end of the outer race 1 (the end that is located at the center in the width direction when assembled to an automobile, and is the left end in FIG. 14).
A mounting portion 12 for mounting the outer ring 1 to a suspension device
Is provided. A gap between the outer end opening of the outer race 1 and the outer peripheral surface of the intermediate portion of the hub 2 is closed by a seal ring 13. In the case of a heavy-duty rolling bearing unit for an automobile, tapered rollers may be used as the plurality of rolling elements 9 instead of balls as shown in the figure.

[0005] In order to incorporate the rotational speed detecting device into the rolling bearing unit as described above, the encoder 3 is externally fixed to the outer peripheral surface of the inner end of the inner ring 7 at the portion deviated from the inner ring raceway 8. I have. The encoder 3 is formed by subjecting a magnetic metal plate such as a mild steel plate to plastic working to form an entire ring having an L-shaped cross section.
The cylindrical portion 14 is fixed to the inner end of the inner ring 7 by tightly fitting the cylindrical portion 14 to the inner end of the inner ring 7. Each of the annular portions 15 has a slit-shaped through hole 1 that is long in the diameter direction of the annular portion 15.
By forming a large number of 6 and 16 radially at equal intervals in the circumferential direction, the magnetic characteristics of the annular portion 15 are alternately and uniformly changed in the circumferential direction.

Further, a cover 17 is fitted and fixed to the inner end opening of the outer ring 1 so as to face the inner side surface of the circular ring portion 15 of the encoder 3. The end opening is closed. The cover 17, which is formed by plastically processing a metal plate, has a fitting cylindrical portion 18 that can be fitted and fixed in the inner end opening of the outer race 1, and a closing plate portion 19 that closes the inner end opening. At the center of the closing plate portion 19, a bottomed cylindrical bulging portion 20 is formed to prevent interference between the closing plate portion 19 and the nut 6. A through hole 21 is formed in a portion of the closing plate portion 19 near the outer periphery in a diametrically outer portion than the bulging portion 20, and the detecting portion 22 of the sensor 4 is connected to the cover 17 through the through hole 21. Inserted inside. A mounting flange 23 is fixed to the outer peripheral surface of the intermediate portion of the sensor 4, and the mounting flange 23 is attached to the closing plate 19 of the cover 17 by the set screw 2.
By fixing the sensors 4 and 24, the sensor 4 is fixedly connected to the cover 17 in a predetermined positional relationship. In the state where the sensor 4 is fixedly connected to the cover 17 in this manner, the distal end surface of the detection unit 22 faces the inner side surface of the annular portion 15 constituting the encoder 3 via a minute gap.

When the above-described rolling bearing unit with a rotation speed detecting device is used, the mounting portion 12 fixed to the outer peripheral surface of the outer race 1 is fixedly connected to a suspension device by bolts (not shown), and the hub is fixed. The wheels are rotatably supported by the suspension device by fixing the wheels to the flanges 11 fixedly provided on the outer peripheral surface of the wheel 2 with studs 25 provided on the flanges 11. When the wheel rotates in this state, the vicinity of the end face of the detection unit 22 of the sensor 4 is
The through holes 16, 16 formed in the circular ring portion 15 and the pillars existing between the circumferentially adjacent through holes 16, 16 alternately pass. As a result, the density of the magnetic flux flowing in the sensor 4 changes, and the output of the sensor 4 changes. The frequency at which the output of the sensor 4 changes in this way is proportional to the rotation speed of the wheel. Therefore, if the output of the sensor 4 is sent to a controller (not shown), ABS and TCS can be appropriately controlled.

However, in the case of the above-mentioned conventional structure,
The sensor 4 is covered by a pair of set screws 24, 24.
7 and fixed. Therefore, the sensor 4 is covered by the cover 1 at the assembly plant of the rolling bearing unit with the rotation speed detecting device.
Since the operation of mounting on the roller 7 is troublesome and requires a long operation time, the cost of the rolling bearing unit with the rotation speed detecting device is increased. Also, the work of removing the sensor 4 from the cover 17 and mounting it again for repair or the like is troublesome.
To that extent, the cost required for repair is increased.

In order to solve such inconvenience, US Pat. No. 5,756,894 discloses a structure in which a sensor can be easily attached to and detached from a cover. In the case of the structure described in this specification, the cover that supports the sensor includes a cover body made of a synthetic resin and a fitting cylinder made of a metal plate molded at the base end of the cover body. The fitting tube is fixed to the inner end of the outer ring so as to close the inner end opening of the outer ring.
In addition, a through hole is formed in a part of the cover body facing the encoder, and the sensor is freely held without rattling in a state where the through hole protrudes from one surface of the cover body. The holding cylinder part is formed. When supporting the sensor on such a cover, a distal end portion, which is a detecting portion of the sensor, is inserted into the inside of the cover through the holding cylinder portion and the through hole, and a proximal end outer peripheral surface of the sensor is provided. The engaging tip of the elastic piece provided on the holding cylinder is engaged with a locking projection provided on the outer peripheral surface of the holding cylinder. Conversely,
When removing the sensor from the cover, the engagement between the tip of the engagement piece and the engagement protrusion is released by elastically deforming the engagement piece, and the inside of the holding cylinder and the through hole is removed. Extract the above sensor from.

[0010]

In the case of the structure described in U.S. Pat. No. 5,756,894, the sensor can be easily attached to and detached from the cover.
Since this cover is made by molding a synthetic resin and a metal plate, the cost increases because the molding is performed. For this reason, it is desired to realize a structure in which the sensor can be easily attached to and detached from the cover as described above at low cost. The rolling bearing unit with a rotation speed detecting device of the present invention has been invented in view of such circumstances.

[0011]

A rolling bearing unit with a rotation speed detecting device according to the present invention has a stationary orbit on a stationary side peripheral surface similarly to the case of the above-mentioned conventional rolling bearing unit with a rotation speed detecting device. , And a stationary wheel that does not rotate during use,
A rotating ring having a rotating orbit on a rotating side peripheral surface and rotating at the time of use, a plurality of rolling elements rotatably provided between the stationary orbit and the rotating orbit, and supported at one end of the stationary wheel A fixed metal plate cover, and an encoder having a part of the rotating wheel opposed to the cover and supported concentrically with the rotating wheel, the circumferential characteristics of which are alternately changed at equal intervals. And a through hole provided in a part of the cover facing the encoder, and supported by a part of the cover in a state where the through hole is inserted, and a detection part of the cover faces a detected part of the encoder. And a sensor that has been turned on. In particular, in the rolling bearing unit with the rotation speed detecting device of the present invention, the inside of the through hole or the side surface of the cover near the through hole is formed separately from the cover, and the The holding cylinder connected to the cover is locked, and the sensor is made detachable inside the through hole by the holding cylinder.

[0012]

The above-described rolling bearing unit with a rotation speed detecting device of the present invention rotatably supports a wheel with respect to a vehicle suspension and detects the rotation speed of the wheel. This is the same as the case of the conventional structure described above. In particular, in the case of the rolling bearing unit with the rotation speed detecting device of the present invention, in order to support the sensor with respect to the cover made of a metal plate, it is provided separately from the cover (without being integrally molded with the cover). A holding cylinder made of synthetic resin, which is manufactured and then connected to this cover, is used. Because of this,
The cost can be reduced by omitting the step of performing molding. Further, since the sensor can be freely attached to and detached from the cover via the holding cylinder, the sensor can be easily attached to and detached from the cover.

[0013]

1 to 3 show a first embodiment of the present invention. The feature of the present invention is that the cover 1
The structure of the portion supporting the sensor 4a with respect to 7a.
The structure and operation of the rolling bearing unit, which supports the rotating wheel rotatably with respect to the stationary wheel, are basically the same as the conventional structure shown in FIGS. The same reference numerals are given and duplicate explanations are omitted or simplified, and the following description focuses on features of the present invention and portions different from the conventional structure. It should be noted that the figure showing the embodiment of the present invention is different from FIG. 13 showing the above-mentioned conventional structure in that the inside and outside directions in the width direction of the vehicle are reversed left and right.

An encoder 3a is externally fixed to the inner end (right end in FIG. 1) of the inner ring 7 on the outer peripheral surface (rotation side peripheral surface) of a portion deviating from the inner raceway 8 which is a rotating raceway. . The encoder 3a includes a support ring 26 and a permanent magnet 27. The support ring 26 is formed by bending a magnetic metal plate such as a soft steel plate such as SPCC to form an entire ring having an L-shaped cross section, and is tightly fitted to the inner end of the inner ring 7 by external fitting. ing. The permanent magnet 27 is formed by, for example, sticking rubber mixed with ferrite powder to the inner surface of the annular portion constituting the support ring 26 by baking or the like.
The permanent magnet 27 is magnetized in the axial direction (the left-right direction in FIG. 1), and the magnetization direction is alternately changed at equal intervals in the circumferential direction. Therefore, the detected part is
On the inner surface of the encoder 3a, S poles and N poles are alternately arranged at equal intervals in the circumferential direction.

A cover 17a is attached to the inner end opening (one end of the claim) of the outer race 1 to close the inner end opening of the outer race 1. The cover 17a, which is formed by plastically processing a metal plate such as a steel plate or a stainless steel plate, is formed into a bottomed cylindrical shape as a whole.
8 has a plate-like closing plate portion 29 for closing the opening at the inner end. In the case of this example, the distal end of the fitting cylindrical portion 28 is
It has a crank-shaped cross section. The small-diameter cylindrical portion 30 provided at the outer end (the left end in FIG. 1) of the fitting cylindrical portion 28
Is fitted to the inner end of the outer ring 1 by interference fit, and a step 32 similarly provided near the outer end is abutted against the inner end surface of the outer ring 1. Further, the closing plate portion 29
Is provided so as to close the inner end opening of the large-diameter cylindrical portion 31 provided from the middle portion to the inner half portion of the fitting tubular portion 28. As described above, in the case of the present embodiment, the closing plate portion 29 is larger than the diameter of the inner end portion (small-diameter cylindrical portion 30) of the fitting tubular portion 28 which is fitted and fixed to the inner end portion of the outer ring 1. By increasing the diameter of the outer end portion (large-diameter cylindrical portion 31) where
The diameter of the closing plate portion 29 can be made larger than the inner diameter of the inner end of the outer ring 1. With this configuration, a sensor 4a described below can be freely supported on a larger diameter portion of the closing plate portion 29, so that the accuracy of rotation speed detection by the sensor 4a can be improved.

The sensor 4a is supported on a portion of the closing plate 29 near the outer diameter. That is, a circular through-hole 33 is formed in a portion of the closing plate portion 29 near the outer diameter facing the encoder 3a, and a holding cylinder 34 is attached to the inner diameter side of the through-hole 33. And the sensor 4
a is inserted from the inside to the outside (from right to left in FIGS. 1 and 2) of the inside of the holding cylinder 34, and the engagement protrusion 50 provided on the outer peripheral surface of the holding cylinder 34 and the sensor 4 a And a locking piece 46 provided at the base end (the right end in FIGS. 1 and 2). In this state, the detection unit 2 of the sensor 4a
2 (left end face in FIGS. 1 and 2) with the encoder 3
The inner surface of the permanent magnet 27 constituting a is opposed to the inner surface of the permanent magnet 27 via a minute gap extending in the thrust direction.

The holding cylinder 34 is formed entirely of a synthetic resin in a cylindrical shape, and is capable of freely inserting an insertion portion 44 (described later) constituting the sensor 4a at the center thereof without play.
A cylindrical holding hole 43 is provided. A retaining groove 48 is formed near the inner end of the inner peripheral surface of the holding hole 43, and an O-ring 49 is retained in the retaining groove 48. When the insertion portion 44 of the sensor 4a is inserted into the holding hole 43, the O-ring 49 is
8 and elastically compressed between the outer peripheral surface of the insertion portion 44 to seal between the inner peripheral surface of the holding hole 43 and the outer peripheral surface of the insertion portion 44. An outward flange-shaped flange 35 is formed on the outer peripheral surface of the intermediate portion of the holding cylinder 34. A locking groove 36 is formed all around the outer surface of the flange 35 near the inner periphery, and an O-ring 37 is attached to the locking groove 36. In order to assemble the holding cylinder 34 into the through hole 33 formed in the closing plate portion 29, in a state where the outer surface of the flange portion 35 abuts against the inner surface of the closing plate portion 29, the O-ring 37 It is elastically compressed between the bottom surface of the locking groove 36 and the inner surface of the closing plate portion 29, and the outer peripheral surface of the holding cylinder 34 and the through hole 3 are compressed.
3. Seal between the inner peripheral edge of No.3.

When assembling such a holding cylinder 34 inside the through hole 33, first, the outer end (left end in FIGS. 1 and 2) of the holding cylinder 34 is closed with the through hole 33. The outer surface of the flange portion 35 is brought into contact with the inner surface of the closing plate portion 29 through the inner surface of the plate portion 29. Next, a ring-shaped washer 38 is externally fitted to the outer end of the holding cylinder 34 projecting from the outer surface of the closing plate portion 29, and the washer 3 is provided.
8 is engaged with a groove 39 formed in a portion of the outer peripheral surface of the holding cylinder 34 near the outer end. In this state, the washer 38 is elastically sandwiched between the inner surface of the concave groove 39 and the outer surface of the closing plate portion 29, as shown in detail in FIG. Thereby, the holding cylinder 34 is provided with elasticity that faces outward in the axial direction.

That is, the washer 38 is formed by stamping and forming a plate made of an elastic material such as spring steel such as SK5 by a press, and then quenching and hardening the whole, as shown in FIG. Has formed. The inner diameter side portion of the washer 38 formed in this way is axially one side toward the inner diameter side. In the assembled state shown in FIGS.
Left and right directions) are inclined in the direction toward outward｝. Further, a plurality of notches 40, 40 are formed at equal intervals in the circumferential direction on the inner peripheral edge of the inner diameter side portion thus inclined, so that a plurality of notches 40, 40 are provided between the respective notches 40, 40. Tongue pieces 41, 41 are formed. Thus, the inner diameter side portion of the washer 38 is formed so as to be capable of imparting sufficient elasticity in the axial direction. Accordingly, such a washer 38 is connected to the inner surface of the concave groove 39 and the closing plate portion 29 as described above.
In the state of being elastically sandwiched between the outer surface of the washer 38 and the inner diameter side portion of the washer 38, the inner surface of the concave groove 39 is elastically pressed, and the elasticity of the holding cylinder 34 facing outward in the axial direction is reduced. Give. On the other hand, as described above, the flange 35 formed on the outer peripheral surface of the holding cylinder 34 abuts against the inner surface of the blocking plate 29. Therefore, in the state shown in FIG. 2, the holding cylinder 34 can be assembled without rattling inside the through hole 33.

On the other hand, the sensor 4a supported inside the holding cylinder 34 is a Hall element, a magnetoresistive element (MR element).
Such as a magnetic detecting element that changes characteristics according to the flow direction of the magnetic flux, and a detecting means including an IC incorporating a waveform shaping circuit for adjusting the output waveform of the magnetic detecting element,
It is embedded in a holder 42 made of synthetic resin. Such a holder 42 includes a columnar insertion portion 44 that can be inserted into the holding hole 43 of the holding cylinder 34 without rattling, and an outward flange-shaped flange provided on the outer peripheral surface of the base end of the insertion portion 44. Part 45 and a locking piece 4 provided so as to extend from a part of the outer circumferential surface of the flange part 45 in the circumferential direction to the distal end side in the axial direction (left side in FIGS. 1 and 2).
6 is provided. The distance between the center axis of the insertion portion 44 and the inner surface (the lower surface in FIGS. 1 and 2) of the locking piece 46 is determined by the distance between the center axis of the holding tube 34 and the outer peripheral surface of the holding tube 34 (this (Half the outer diameter of the holding cylinder 34).
Further, an engaging hole 47 is formed in a portion of the locking piece 46 near the front end, and the front end of the locking piece 46 is inclined in a direction toward the diametrically outward toward the front end. The detection means is embedded and supported in the insertion portion 44,
The distal end of the insertion section 44 is the detection section 22.

When the sensor 4a as described above is mounted on the holding cylinder 34, an engaged portion such as an engaging projection 50 provided on the outer peripheral surface of the holding cylinder 34 near the outer end thereof, The insertion portion 44 is inserted into the holding hole 43 of the holding cylinder 34 while keeping the phase in the circumferential direction coincident with the engaging portion such as the piece 46.
3 from the inner end opening side. Then, the holding cylinder 34
The flange 45 is brought into contact with the inner end surface of the locking piece 46, and the engaging projection 50 is engaged with the engaging hole 47 provided at the tip of the locking piece 46. That is, when the insertion portion 44 is inserted into the holding hole 43 as described above, the distal end of the locking piece 46 is guided by the inclined surface 51 provided on the inner end surface side of the engagement projection 50, and has a diameter. It rides on the engagement protrusion 50 while elastically deforming outward in the direction, and slides on the engagement protrusion 50. When the flange 45 abuts against the inner end surface of the holding cylinder 34, the engaging projection 50 and the engaging hole 47 are aligned, and the locking piece 46 is elastically restored inward in the diameter direction. Thus, the engagement projections 50 and the engagement holes 47 are engaged.
In the drawings, the engagement projections 50 and the locking pieces 46 are shown as one set each. However, the engagement projections 50 and the locking pieces 46 are formed at equal intervals over a plurality of sets in the circumferential direction. It can also be provided. Further, the engagement projection 50 and the locking piece 46
By adopting a structure in which a plurality of sets are not arranged at equal intervals in the circumferential direction, the phase of the sensor 4a in the circumferential direction can be easily determined.

In any case, the operation of mounting the sensor 4a on the holding cylinder 34 can be performed simply by pushing the insertion portion 44 into the holding hole 43. In this state, the sensor 4a is connected to the holding cylinder 34.
Of the engagement projection 5
0 and the holding cylinder 34 based on the engagement between the
You will not be inadvertently falling off from inside. On the other hand, when the sensor 4a mounted on the holding cylinder 34 is detached from the holding cylinder 34 as described above, the distal end of the locking piece 46 is elastically displaced radially outward, so that the engagement projection With the engagement between the engagement hole 47 and the engagement hole 47 is released, the insertion portion 44 is extracted from the holding hole 43. As described above, according to the structure of this example, the sensor 4a can be easily attached to and detached from the holding cylinder 34 assembled to the cover 17a.

As described above, in the case of the rolling bearing unit with the rotation speed detecting device of this embodiment, the sensor 4a can be easily attached to and detached from the holding cylinder 34 supported by the cover 17a. A synthetic resin holding cylinder 34 for holding the sensor 4a is formed separately from the metal cover 17a.
The holding cylinder 34 is connected to the through hole 3 formed in the cover 17a.
3 is assembled. For this reason, the aforementioned US Pat.
Unlike the conventional structure described in Japanese Patent No. 56894, the cover for supporting the sensor does not need to be formed by molding a metal plate and a synthetic resin. In this manner, the manufacturing cost can be reduced by omitting the molding step. In the case of this example, since the holding cylinder 34 is made of synthetic resin,
The retaining grooves 36 and 48 for mounting the O-rings 37 and 49 described above on the holding cylinder 34 are easily formed. Accordingly, a structure for sealing the mounting portion of the holding cylinder 34 to the cover 17a and the mounting portion of the sensor 4a to the holding cylinder 34 can be easily realized by the O-rings 37 and 49.

Next, FIGS. 4 to 7 show a second example of the embodiment of the present invention. In the case of the present example, a pair of flange portions 52, 52 are provided at two positions on the outer peripheral end surface of the holding cylinder 34a on the diametrically opposite side. The inner ends of the flanges 52, 52 are formed on a pair of recesses 53, 53 formed on the outer surface of the closing plate 29 at two positions on the outer peripheral surface of the through hole 33a in the diameter direction. Is engaged.
Further, the outer end surface of the annular member 54 made of synthetic resin, which is fitted around the outer end portion of the holding cylinder 34a, is brought into contact with the inner surface of the closing plate portion 29. At the same time, this annular member 54
A washer 38 similar to that used in the first example is applied between the inner end surface of the holding cylinder 34 and a concave groove 55 formed over the entire circumference of the intermediate portion of the holding cylinder 34a. 3
4a is provided with an elastic force directed inward in the axial direction. In this state, the holding cylinder 34a is connected to the flanges 52, 52
And the recesses 53, 53, and the elastic force applied from the washer 38 inward in the axial direction. Assembled without rattling inside.

As described above, the holding cylinder 34 is provided inside the through hole 33a.
When assembling a, first, the annular member 54 and the washer 38 are pushed into the outer peripheral surface of the holding cylinder 34a from the inner end side of the holding cylinder 34a, and the inner diameter side portion of the washer 38 is The holding cylinder 34a is engaged with the concave groove 55 formed on the outer peripheral surface of the intermediate portion. When the annular member 54 and the washer 38 are externally fitted to the holding cylinder 34a from the inner end side of the holding cylinder 34a in this manner, the engaging projections provided on the outer peripheral surface of a portion near the inner end of the holding cylinder 34a. 50 is elastically deformed diametrically inward together with a part of the holding cylinder 34a,
The passage of the annular member 54 and the washer 38 is permitted.
If a structure is employed in which the leading edge of the engaging projection 50 does not protrude from the outer peripheral surface of a portion of the holding cylinder 34a located in the annular member 54, a part of the holding cylinder 34a can be elastically deformed. The annular member 54 and the washer 38
Can easily be fitted to the outside.

After the annular member 54 and the washer 38 have been fitted onto the holding cylinder 34a in this manner, the outer end of the holding cylinder 34a is then covered with the cover 1 through the through hole 33a.
7b. At this time, a pair of flange portions 52, 52 provided on the outer peripheral surface of the outer end of the holding cylinder 34a are located at two positions on the inner peripheral edge of the through hole 33a on the diametrically opposite side from the concave portions 53, 53. It is passed through a pair of notches 58, 58 (see FIG. 7) provided in the removed portion. The outer end surface of the annular member 54 abuts on the inner surface of the closing plate portion 29 during the insertion of the flange portions 52, 52 through the notches 58, 58 into the inside of the cover 17b. Therefore, from this state, the holding cylinder 34a is further moved.
By pressing against the elasticity of the washer 38, the flanges 52, 52 are passed through the notches 58, 58. Next, the holding cylinder 34a is stored in a predetermined amount (for example, 90
Degree) by rotating each of the flanges 52, 52 into engagement with the corresponding one of the recesses 53, 53.
4a is completed. In this manner, in a state where the flange portions 52, 52 are engaged with the concave portions 53, 53, the holding cylinder 3 is formed by the inner diameter side portion of the washer 38.
The size of each part is regulated so that the elastic force directed inward in the axial direction can be applied to 4a.

In the case of this embodiment, the O-ring 56 is formed in the locking groove 72 formed near the outer end of the outer peripheral surface of the holding cylinder 34a.
And the outer peripheral surface of the holding cylinder 34a and the inner peripheral surface of the annular member 54 are sealed in a state where the annular member 54 is fitted around the outer end of the holding cylinder 34a.
An O-ring 57 is locked in a locking groove 73 formed on the outer end surface of the annular member 54 over the entire circumference.
In a state where the outer end surface of the block 4 abuts against the inner surface of the closing plate portion 29, a seal is formed between the outer end surface of the annular member 54 and the inner surface of the closing plate portion 29. The inner diameter of the O-ring 57 locked on the outer end surface of the annular member 54 is the same as that of the through-hole 33.
The diameter of the pair of cutouts 58, 58 formed on the inner peripheral edge of a is larger than the diameter of the outer peripheral edge.

On the other hand, the sensor 4b according to the present embodiment, which is mounted in the holding cylinder 34a, has an intermediate portion on one side (left side in FIGS. 4 and 5) of a flange 45 formed on the outer peripheral surface of the base end of the holder 42a. A locking groove 59 is formed over the entire circumference, and the O-ring 60 is locked in the locking groove 59. In a state where one side surface of the flange 45 abuts against the inner end surface of the holding tube 34a, the O-ring 60 is elastically compressed between the bottom surface of the locking groove 59 and the inner end surface of the holding tube 34a. Then, a seal is provided between one side surface of the flange 45 and the inner end surface of the holding cylinder 34a. Further, a cylindrical portion 61 is formed on the outer peripheral edge of one side surface of the flange portion 45, and the cylindrical portion 61 is externally fitted to the inner end of the holding cylinder 34a. Also in the case of this example having such a configuration, it is not necessary to form the cover 17b supporting the sensor 4b by molding a metal plate and a synthetic resin. As a result, manufacturing costs can be reduced.

In the case of this embodiment, the support ring 26a constituting the encoder 3b is formed in a crank shape in cross section, and the permanent magnet 27a is formed in a cylindrical shape. This permanent magnet 27a
Are magnetized in the diameter direction, and the magnetization directions are alternately changed at equal intervals in the circumferential direction. Therefore, on the inner peripheral surface of the permanent magnet 27a, N poles and S poles are arranged alternately and at equal intervals in the circumferential direction. Such a permanent magnet 27a is attached to the inner peripheral surface of a large-diameter cylindrical portion constituting the support ring 26a, which protrudes in the axial direction from the inner end opening of the outer ring 1. In the case of this example, the detection unit 22 of the sensor 4b is opposed to the inner peripheral surface (detected portion) of the permanent magnet 27a via a minute gap extending in the radial direction. The cover 17b that supports the sensor 4b has an outward flange-shaped flange 62 near the outer end of the fitting cylinder 28a, and connects the outer end of the fitting cylinder 28a to the inside of the outer race 1. The flange 62 is abutted against the inner end surface of the outer race 1 while being press-fitted and fitted into the end.

Further, in the case of this embodiment, unlike the case of the above-described first embodiment, no nut 6 (see FIG. 14) is used for fixing the inner ring 7 to the hub 2. Instead, the inner end of the hub 2 is formed into a cylindrical portion 63, and a portion protruding from the inner end surface of the inner ring 7 at the tip end of the cylindrical portion 63 is swaged outward in the diametrical direction to expand the inner ring 7 It is fixedly connected to the hub 2. As a result, not only the cost can be reduced because the nut 6 becomes unnecessary, but also the space can be effectively used because the nut 6 having a large volume is omitted. Other configurations and operations are the same as those of the above-described first example.

Next, FIGS. 8 to 13 show a third embodiment of the present invention. In the case of the first and second examples described above, the holding cylinder 3 for holding the sensors 4a and 4b
4, 34a were previously assembled to the closing plate portion 29 constituting the covers 17a, 17b. On the other hand, in the case of the present example, before inserting the sensor 4c into the through hole 33a formed in the closing plate portion 29, the outer periphery of the base half (the right half of FIGS. 9 and 11) of the sensor 4c The holding cylinder 34b is attached to the surface.

That is, in the case of the present embodiment, the holder 42b constituting the sensor 4c is connected to the cover 1 through the through hole 33a.
First half to be inserted inside 7b (left half of FIGS. 9 and 11)
Is a small-diameter cylindrical portion 64 having an outer diameter slightly smaller than the diameter of the through-hole 33a, and the base half portion for externally fitting the holding cylinder 34b has an outer diameter slightly larger than the diameter of the through-hole 33a. The large-diameter cylindrical portion 65 having And
The outer peripheral surfaces of these two columnar portions 64 and 65 are made continuous by a step surface 66. The detecting portion 22 of the sensor 4c is provided at a portion of the small-diameter cylindrical portion 64 near the front end. Further, a pair of flange portions 74, 74, each of which is an engagement portion, are formed at two positions on the outer peripheral surface of the small-diameter cylindrical portion 64 near the base end on opposite sides in the diameter direction.

Further, a pair of engagement grooves 67, 67, which are respectively long in the circumferential direction, are formed at two positions on the outer peripheral surface of the large-diameter cylindrical portion 65 near the base end on opposite sides in the diameter direction. . In the case of this example, the bottom surface of each of the engagement grooves 67, 67
As shown in detail in FIG. The width W of each of the engagement grooves 67, 67 in the axial direction (the left-right direction in FIGS. 8, 9, and 11) is determined by the height in the free state of the pressing portion 71 constituting the coupling spring 69 described later. Is the same as the width H of
It is slightly larger (W ≧ H). In the case of this example, each of the flange portions 74, 74 and each of the engagement grooves 6
The phase of the circumferential arrangement with 7, 67 is 90 ° relative to each other.
I'm staggering. A locking groove 75 is formed in the outer peripheral surface of the middle portion of the large-diameter cylindrical portion 65, and an O-ring 76 is locked in the locking groove 75. As will be described later, when the holding cylinder 34b is externally fitted to the large-diameter cylindrical portion 65, the O
A ring 76 is provided between the bottom surface of the locking groove 75 and the holding cylinder 34.
b, it is elastically compressed between the outer peripheral surface of the large-diameter cylindrical portion 65 and the inner peripheral surface of the holding cylinder 34b.

The holding cylinder 34b has a cylindrical holding hole 43 at the center thereof through which the large-diameter cylindrical portion 65 can be inserted without looseness, and has a simple cylindrical outer peripheral surface. Also, a portion near the inner end of the holding cylinder 34b (FIGS. 9 and 12)
A pair of circumferentially long engagement holes 68, 68 penetrating the inner and outer peripheral surfaces of the holding cylinder 34b, respectively, are formed at two positions on the diametrically opposite side of the right end portion of the holding cylinder 34b. In the case of the present example, both inner circumferential surfaces of the engagement holes 68, 68 are formed in parallel with each other as shown in detail in FIG. In the case of this example, as described later, the holding cylinder 34b
Are fitted to the large-diameter cylindrical portion 65, and the engaging holes 68, 68 are aligned with the engaging grooves 67, 67. The inner side surface and the bottom surface of each of the engagement grooves 67 are arranged on the same plane. A locking groove 77 is formed on the outer end surface (left end surface in FIGS. 9 and 12) of the holding cylinder 34b over the entire circumference, and the O-ring 78 is locked in the locking groove 77. . When the outer end surface of the holding cylinder 34b is in contact with the inner surface of the closing plate portion 29 when the sensor 4c described later is mounted, the O-ring 78 is connected to the bottom surface of the locking groove 77 and the closing plate portion 29. Elastically compressed between the inner surface of the holding cylinder 34b and the inner surface of the closing plate 29.

When the holding cylinder 34b as described above is assembled on the outer peripheral surface of the large-diameter cylindrical portion 65 of the holder 42b as described above, a coupling spring 69 as shown in FIG. 13 is used. The coupling spring 69 is formed by bending a wire having elasticity and corrosion resistance, such as stainless spring steel. Such a coupling spring 69 includes at least the holding cylinder 34 b and the large-diameter cylindrical portion 6.
A pair of locking legs 70, 70 which are parallel to each other in the state of being assembled to 5, and the base edges (upper edges of FIGS. 8 to 10 and 13) of these locking legs 70, 70 are connected to each other. Connection part 7
9 is provided. Pressing portions 71, 7 projecting in the direction perpendicular to the plane including the locking legs 70, 70 and in the same direction are provided at the intermediate portions of the locking legs 70, 70.
1 is formed by bending the intermediate portion of each of the locking legs 70, 70 into a partially arcuate shape. Also, each of the locking legs 70,
8 (the lower ends of FIGS. 8 to 10 and 13) are slightly bent in directions opposite to each other so that the two locking legs 70 and 70 are bent.
The distance between the end portions of each of them is increased toward the end portion. The reason for widening the distance between the tips in this way is
At the time of assembling the holding cylinder 34b and the large-diameter cylindrical portion 65, which will be described later, each of the locking legs 70, 70 is attached to the holding cylinder 34.
This is to make it easy to fit the outer diameter b and the large-diameter cylindrical portion 65. or,
In the free state of the coupling spring 69, the two locking legs 7
The interval between 0 and 70 is set to be smaller toward the front end side.

When assembling the holding cylinder 34b around the large-diameter cylindrical portion 65 of the holder 42b using the coupling spring 69 as described above, first, the holding cylinder 34b is connected to the large-diameter cylindrical portion. 65 and the holding cylinder 34b
And the large-diameter cylindrical portion 65
Are aligned with the respective engagement grooves 67 formed on the outer peripheral surface of. Next, a pair of locking legs 70, 70 constituting the coupling spring 69 are fitted to the holding cylinder 34b.
Each of the locking legs 70, 70 is connected to each of the engagement holes 68, 6,
8 and the respective engaging grooves 67, 67. In this state, the pressing portions 71, 71 formed in the intermediate portions of the locking legs 70, 70, as shown in FIG.
7, 67 are engaged. Then, based on this engagement, the holding cylinder 34b and the holder 42b are prevented from moving in the axial direction. That is, an intermediate portion of each of the pressing portions 71, 71 is provided on one side surface 80 of each of the engagement grooves 67, 67, and both side portions of each of the pressing portions 71, 71 of the locking legs 70, 70 are provided as described above. One side 81 of each of the engagement holes 68 is elastically abutted. As a result, the elasticity directed inward to the holder 42b, the elasticity directed outward to the holding cylinder 34b,
Each is given. When the assembly is completed, the flanges 74, 74 are provided in the recesses 53, 53, and the outer end surface of the holding cylinder 34b is provided in the closing plate 29 of the cover 17b.
Each holder is pressed to support and fix the holder 42b to the cover 17b.

When mounting the holder 42b with the holding cylinder 34b as described above into the through-hole 33a formed in the closing plate portion 29, first, the small-diameter cylindrical portion 64 of the holder 42b is inserted into the through-hole 33a. A pair of flanges 74, 74 formed on the outer peripheral surface of a portion near the base end of the small-diameter cylindrical portion 64 while being inserted through the small hole 33a are formed on the inner peripheral edge of the through hole 33a.
The cover 1 is inserted through a pair of cutouts 58, 58 (FIG. 7).
7b. In addition, in this way, each flange 7
4, 74 through the notches 58, 58
During the insertion into the inside of 7b, the outer end surface of the holding cylinder 34b abuts on the inner surface of the closing plate portion 29. Therefore,
After this state, the holder 42b inserted into the inside of the holding cylinder 34b is attached to the pressing portion 7 constituting the coupling spring 69.
1, 71 against the elasticity of each of the flange portions 7.
4 and 74 are inserted into the cover 17b.

Next, the holder 42b is rotated by a predetermined amount so that the inner ends of the flanges 74 are engaged with the recesses 53. In this state, with the respective flange portions 74, 74 engaged with the respective concave portions 53, 53,
Each of the pressing portions 71, 71 constituting the coupling spring 69 is provided with an engaging groove 67, 6 formed on the outer peripheral surface of the large-diameter cylindrical portion 65.
7 is pressed against one side face 80, 80, and
An elastic force directed inward in the axial direction (to the right in FIGS. 8 and 9) is provided.
Accordingly, the holder 42b is provided with the above-described flange portions 74,
In a state where the rotation of the closing plate portion 29 is prevented based on the engagement between the concave portions 53 and the concave portions 53 and the elasticity of the pressing portions 71 and 71 applied inward in the axial direction, It is mounted without rattling inside the through hole 33a.

On the other hand, when removing the holder 42b constituting the sensor 4c mounted as described above from the inside of the through hole 33a formed in the closing plate portion 29, the pair of pressing portions 7
By slightly pushing the holder 42b outward in the axial direction against the elasticity of the flanges 1 and 71, the flanges 74,
The engagement between the recess 74 and the recesses 53 is released. And
The holder 42b is rotated by a predetermined amount, the flanges 74 are pulled out of the cover 17b through the cutouts 58, 58, and the small-diameter cylindrical portion 6 is removed.
4 is pulled out from the through hole 33a. Also in the case of this example having such a configuration, it is not necessary to form the cover for supporting the sensor by molding a metal plate and a synthetic resin. Therefore, the manufacturing cost can be reduced. Other configurations and operations are the same as those in the first and second examples described above.

In each of the illustrated examples, the case where the outer wheel 1 is a stationary wheel has been described. However, the present invention can be applied to a case where the outer wheel is a rotating wheel. In this case, the cover on which the sensor is to be mounted is formed in a ring shape as a whole, and its inner peripheral edge is fixed to the inner ring which is a stationary wheel. Further, the space between the outer peripheral edge of the cover and the outer ring is closed by a seal ring. Further, the sensors and encoders are not limited to the magnetic type as shown in the figure, but may be photoelectric type and eddy current type.

[0041]

The rolling bearing unit with the rotation speed detecting device of the present invention is constructed and operates as described above.
Not only can the sensor be easily attached to and detached from the cover, but also the structure of the portion that supports the sensor on the cover can be made at low cost.

[Brief description of the drawings]

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

FIG. 2 is an enlarged view of a portion A in FIG.

FIG. 3 is a front view of a washer incorporated in the first example.

FIG. 4 is a sectional view showing a second example of the embodiment of the present invention.

FIG. 5 is an enlarged view of a portion B in FIG. 4;

FIG. 6 is a perspective view of a holding cylinder incorporated in the second example.

FIG. 7 also shows a through hole provided in the cover,
(A) is a diagram viewed from the left of FIG. 5, (b) is a C of (a)
-C sectional drawing.

FIG. 8 is a sectional view showing a third example of the embodiment of the present invention.

FIG. 9 is an enlarged view of a portion D in FIG. 8;

FIG. 10 is a sectional view taken along the line EE of FIG. 9;

FIG. 11 is a perspective view of a sensor incorporated in a third example.

FIG. 12 is a perspective view of the holding cylinder.

FIG. 13 is a perspective view of the holding member.

14 shows an example of a conventional structure, FOG of FIG.
Sectional view.

FIG. 15 is a view as viewed from the left of FIG. 14;

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Outer ring 2 Hub 3, 3a, 3b Encoder 4, 4a, 4b, 4c Sensor 5 Outer ring track 6 Nut 7 Inner ring 8 Inner ring track 9 Rolling element 10 Cage 11 Flange 12 Mounting part 13 Seal ring 14 Cylindrical part 15 Cylindrical part 16 Through holes 17, 17a, 17b Cover 18 Fitting tube portion 19 Closing plate portion 20 Swelling portion 21 Through hole 22 Detecting portion 23 Mounting flange 24 Set screw 25 Stud 26, 26a Support ring 27, 27a Permanent magnet 28, 28a Fitting Cylindrical part 29 Closing plate part 30 Small-diameter cylindrical part 31 Large-diameter cylindrical part 32 Step part 33, 33a Through-hole 34, 34a, 34b Holding cylinder 35 Flange part 36 Locking groove 37 O-ring 38 Washer 39 Depression groove 40 Notch 41 Tongue piece 42, 42a, 42b Holder 43 Holding hole 44 Insertion part 45 Flange 46 Locking piece 47 Engaging hole 48 Locking concave 49 O-ring 50 Engagement protrusion 51 Inclined surface 52 Flange 53 Depression 54 Annular member 55 Groove 56 O-ring 57 O-ring 58 Notch 59 Locking groove 60 O-ring 61 Cylindrical portion 62 Flange 63 Cylindrical portion 64 Small-diameter cylinder Portion 65 Large-diameter cylindrical portion 66 Stepped surface 67 Engagement groove 68 Engagement hole 69 Coupling spring 70 Locking leg 71 Pressing portion 72 Locking groove 73 Locking groove 74 Flange 75 Locking groove 76 O-ring 77 Locking groove 78 O-ring 79 Connecting part 80 One side 81 One side

──────────────────────────────────────────────────続 き Continued on the front page (51) Int.Cl. ⁷ Identification symbol FI Theme coat ゛ (Reference) G01D 5/245 G01D 5/245 X

Claims (1)

[Claims] 1. A stationary wheel having a stationary orbit on a stationary side peripheral surface and not rotating even during use, and a rotating orbit on a rotating side peripheral surface,
A rotating wheel that rotates during use, a plurality of rolling elements rotatably provided between the stationary orbit, and a metal plate cover supported and fixed to one end of the stationary wheel; A part of the wheel opposed to the cover is concentrically supported with the rotating wheel, and an encoder having a characteristic in the circumferential direction that is alternately changed at equal intervals. A rotational speed detecting device comprising: a through hole provided in an opposed portion; and a sensor supported by a part of the cover in a state where the through hole is inserted, and a detecting portion of which is opposed to a detected portion of the encoder. In the rolling bearing unit, a holding cylinder formed separately from the cover and subsequently connected to the cover is engaged with the inside of the through hole or a side portion of the cover near the through hole. And the above sensor is held Accordingly, rolling bearing unit, characterized in that is detachable to the inner side of the through hole.