JPH1114645A - Rolling bearing unit with rotary speed detection device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To increase the speed for attaching or detaching by providing an outer wheel that does not rotate when it is used, an inner wheel that rotates when it is used, a rolling element provided so that it can be rolled freely between inner and outer tracks, and a sensor that opposes a detection part and one portion of an encoder and changes an output signal corresponding to the characteristic change in the encoder. SOLUTION: The inner edge part of an outer wheel 1a projects toward the inside in axial direction than the inner edge part of an inner wheel 7 for fixing an encoder 3a, and an insertion hole 30 for penetrating the outer-periphery surface and inner- periphery surface of the outer wheel 1a is provided at one portion that projects toward the inside in axial direction than the inner-edge part that projects toward the inside in axial direction than the inner edge part of the inner wheel 7 at the inner edge part of the outer wheel 1a. A sensor unit 39 has an insertion part 36 being provided close to the tip and a collar part 42 in outer flange shape being provided at a base edge side. The insertion part 36 consists of a base edge side insertion part 37 for freely inserting the insertion hole 30 without any backlash and a tip side insertion part 41. A detection part that opposes the inner surface of a permanent magnet for constituting the encoder 3a is provided on the tip part outer surface of the tip side insertion part 41.

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, the above-mentioned wheel is rotatably supported with respect to the suspension device by a rolling bearing unit with a rotation speed detecting device in which a rotation speed detecting device is incorporated in the above-mentioned rolling bearing unit, and the rotation speed of the wheel is detected. However, it has been widely practiced in recent years.

FIGS. 14 and 15 show an example of a conventional structure of a rotational speed detecting device used for such a purpose.
No.-31539 is disclosed. This rolling bearing unit with a rotation speed detecting device rotatably supports a hub 2 which is a rotating wheel which rotates during use, inside an outer ring 1 which is a stationary wheel which does not rotate during use.
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, on the inner peripheral surface of the outer race 1, which is the stationary peripheral surface, double-row outer raceways 5, 5, each of which is the stationary raceway, are provided. Also, on the outer peripheral surface of the hub 2 and the inner ring 7 which constitutes the rotating wheel together with the hub 2 in a state of being externally fitted to the hub 2 and fixedly connected to the hub 2 by a nut 6 as a rotating side peripheral surface. Are provided with inner ring tracks 8, 8 each being a rotation-side track. 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. 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, the left end in FIG. 14) is provided with a mounting portion 12 for mounting the outer race 1 to a suspension system.
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 15 is fixed to the inner end of the inner ring 7 by fitting the cylindrical portion 15 to the inner end of the inner ring 7 by interference fit. Each of the annular portions 16 has a slit-shaped through hole 1 that is long in the diameter direction of the annular portion 16.
By forming a large number of 7 and 17 radially at equal intervals in the circumferential direction, the magnetic characteristics of the annular portion 16 are changed alternately and at equal intervals in the circumferential direction.

Further, a cover 18 is fitted and fixed to the inner end opening of the outer ring 1 in a state of facing the inner side surface of the circular ring portion 16 of the encoder 3. The cover 18, which is formed by plastically processing a metal plate, has a fitting cylindrical portion 19 that can be fitted and fixed in the inner end opening of the outer ring 1, and a closing plate portion 20 that closes the inner end opening. At the center of the closing plate portion 20, a bottomed cylindrical bulging portion 21 is formed to prevent interference between the closing plate portion 20 and the nut 6. Further, a through hole 22 is formed in a portion near the outer periphery of the closing plate portion 20 and in a portion diametrically outside of the bulging portion 21.
Through the detection unit 24 of the sensor 4 through the cover 18
Inserted inside. A mounting flange 25 is fixed to the outer peripheral surface of the intermediate portion of the sensor 4, and the mounting flange 25 is fixed to the closing plate portion 20 of the cover 18 with set screws 26, 26, whereby the sensor 4 is mounted. 4 is fixedly connected to the cover 18 in a predetermined positional relationship. In the state where the sensor 4 is fixedly connected to the cover 18 in this manner, the distal end surface of the detection unit 24 is
Opposing the inner surface of the device through 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 2 is fixed. The wheels are fixed to the flanges 11 fixedly provided on the outer peripheral surface by studs 27 provided on the flanges 11 to rotatably support the wheels with respect to the suspension device. When the wheel rotates in this state, the vicinity of the end face of the detecting portion 24 of the sensor 4 is moved between the through holes 17 formed in the annular portion 16 and the through holes 17 adjacent in the circumferential direction. The existing pillars pass alternately. 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.

[0008]

In the case of the conventional structure shown in FIGS. 14 and 15, the sensor 4 is connected and fixed to the cover 18 by a pair of set screws 26, 26. Therefore, the work of attaching the sensor 4 to the cover 18 at the assembly plant of the rolling bearing unit with the rotation speed detecting device is troublesome and requires a long working time, so that the cost of the rolling bearing unit with the rotation speed detecting device is increased. In addition, it is troublesome to remove the sensor 4 from the cover 18 and repair it for repair or the like, which increases the cost required for repair. The present invention has been made in view of such circumstances.
The sensor can be easily and quickly attached to and detached from the stationary ring, which is an outer ring, or a fixing member for fixing the outer ring,
The present invention is designed to realize a structure of a rolling bearing unit with a rotation speed detecting device that can reduce costs.

[0009]

A rolling bearing unit with a rotation speed detecting device according to the present invention has an outer raceway on an inner peripheral surface thereof.
An outer ring that does not rotate during use, and an inner ring raceway facing the outer raceway on its outer peripheral surface, and an inner race that rotates during use, and a plurality of rolls that are rotatably provided between the outer raceway and the inner raceway. A rolling element, an encoder fixed to a part of the inner ring concentrically with the inner ring and having a characteristic in the circumferential direction alternately and at equal intervals, and a detecting unit. A sensor that is supported by the outer ring or a part of a fixing member to which the outer ring is fitted and fixed in a state facing the part of the encoder, and that changes an output signal in response to a change in characteristics of the encoder.

[0010] In particular, in the rolling bearing unit with the rotation speed detecting device according to the present invention, at least a part of the outer ring or the fixed member facing a part of the encoder has at least a holder holding the sensor. An insertion hole through which the tip-end portion can be inserted is provided, and a part of the holder holding the sensor, which departs from the tip-end portion, comes into contact with the opening peripheral portion of the insertion hole, so that A positioning portion for positioning the holder holding the sensor in the axial direction of the insertion hole is provided, and a part of the outer ring or a fixed member is provided on a part of the holder, and a part of the holder holding the sensor is provided on the other part. Are provided with elastic members engaged with each other, whereby the positioning portion is pressed against the peripheral edge of the opening of the insertion hole, and the holder holding the sensor is mounted on the outer ring or the outer ring. It is detachably mounted with respect to the fixed member.

[0011]

The rolling bearing unit with the rotation speed detecting device of the present invention configured as described above rotatably supports the wheel with respect to the suspension system of the automobile, and detects the rotation speed of the wheel itself. Is the same as that 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, the operation of attaching and detaching the holder holding the sensor to the outer ring or the fixing member fitted and fixed to the outer ring can be performed easily and quickly.

First, when the holder holding the sensor is mounted on the outer race or the fixing member, a portion near the tip of the holder holding the sensor is inserted into the insertion hole, and the positioning portion is moved to the periphery of the opening of the insertion hole. Part. Next, another part of the elastic member, a part of which is engaged with a part of the outer ring or the fixed member, is engaged with the holder holding the sensor, and the positioning part is positioned on the periphery of the opening of the insertion hole. Press. When removing the holder holding the sensor from the outer ring or the fixed member, conversely, after removing the elastic member from the outer ring or the fixed member,
Withdraw the portion near the tip of the holder holding the sensor from the insertion hole.

The operation of engaging or disengaging another part of the elastic member with the part of the holder holding the sensor is easier than the operation of tightening or loosening the set screw. And it can be done quickly. Therefore, the labor required for the work of attaching and detaching the holder holding the sensor to and from the outer ring or the fixing member can be reduced, and the cost of the rolling bearing unit with the rotation speed detecting device itself and the cost required for repair can be reduced.

[0014]

1 to 11 show a first embodiment of the present invention. The feature of the present invention lies in the structure of a portion for attaching and detaching a sensor unit 39 holding a sensor to a holder to an outer ring which is a stationary wheel constituting a rolling bearing unit or a fixing member for fixing the outer ring.
The structure and operation of the rolling bearing unit, which rotatably supports the hub 2a and the inner ring 7, which are rotating wheels, with respect to the outer ring 1a, are basically the same as those of the conventional structure shown in FIGS. Therefore, the same parts are denoted by the same reference numerals, and redundant description will be omitted or simplified, and the following description will focus on features of the present invention and parts different from the above-described conventional structure. It should be noted that the figure showing the embodiment of the present invention is different from FIG. 14 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. Also, the aforementioned conventional structure
In contrast to the rolling bearing unit for supporting the non-driving wheels (the rear wheels of the FF vehicle and the front wheels of the FR vehicle), in the case of this example, the driving wheels (the front wheels of the FF vehicle and the rear of the FR vehicle) The present invention is applied to a rolling bearing unit for supporting wheels (all wheels of a 4WD vehicle). For this reason, the hub 2a that supports the wheels is formed in a cylindrical shape having a spline hole on the inner peripheral surface.
The shaft 29 of the constant velocity joint 28 can be inserted through the inside of the shaft.

The inner end (the right end in FIG. 1) of the outer ring 1a, which is a stationary wheel, projects axially inward (the right side in FIG. 1) from the inner end of the inner ring 7 to which the encoder 3a described below is fixed. ing. An insertion hole 30 that penetrates the outer peripheral surface and the inner peripheral surface of the outer ring 1a is formed in a part of the inner end of the outer ring 1a protruding inward in the axial direction from the inner end of the inner ring 7. Provided.

The annular gap between the inner end opening of the outer race 1a and the outer peripheral surface of the constant velocity joint 28 is closed tightly by a sealing member 31. The hermetic seal member 31 is formed over the entire periphery of a metal core 32 formed by bending a metal plate so as to have an L-shaped cross section and having an annular shape as a whole, and an inner peripheral portion of an annular portion 33 constituting the metal core 32. And a seal lip 34 made of an elastic material such as rubber or elastomer. Then, the cylindrical portion 35 of the core metal 32 is internally fitted and fixed to the inner end opening of the outer ring 1a by interference fitting, so that the inner end opening of the outer ring 1a is closed tightly. The tip edge of the seal lip 34 is
Is in sliding contact with the outer peripheral surface.

The core 3 of such a hermetically sealed member 31
Since No. 2 is manufactured by press working, it is inherently difficult to obtain good working accuracy. However, in the case of this example, the outer ring 1
The inner end of a is protruded inward in the axial direction from the inner end of the inner ring 7, and the outer ring 1a is finished by shaving with good processing accuracy. Therefore, the inner end surface of the core bar 32 does not need to protrude greatly from the inner end surface of the outer ring 1a. Further, since the sealing member 31 has a simple shape, the outer ring 1a and the core bar 32 are respectively Can be combined almost flush with each other. As a result, the roundness of the annular portion 33 and the seal lip 34 attached to the annular portion 33 can be sufficiently ensured in a state where the metal core 32 is fitted inside the inner end of the outer race 1a. Accordingly, the seal lip 34 is slidably contacted with the outer peripheral surface of the constant velocity joint 28 over the entire circumference with a sufficient contact pressure, so that the sealing performance of the hermetic seal member 31 with respect to the outer ring 1a can be maintained well. .

On the other hand, the encoder 3a is externally fitted and fixed to the inner end (right end in FIG. 1) of the inner ring 7 which forms a rotating wheel together with the hub 2a. The encoder 3a includes, for example, a support ring and a permanent magnet. The support ring is formed by bending a magnetic metal plate such as SPCC or the like to have an L-shaped cross section as a whole, and is externally fixed to the inner end of the inner ring 7 by interference fit. In addition, the permanent magnet is formed by attaching, for example, a rubber mixed with ferrite powder to the inner surface of the annular portion constituting the support ring by baking or the like. The permanent magnet is magnetized, for example, 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, on the inner surface of the encoder 3a, S poles and N poles are alternately arranged at equal intervals in the circumferential direction.

A part of the inner end of the outer ring 1a protruding inward in the axial direction from the inner end of the inner ring 7 and slightly inward from the encoder 3a has a circular cross section. Through the insertion hole 30 in the diameter direction of the outer race 1a.
The outer ring 1a is provided so as to penetrate the outer peripheral surface and the inner peripheral surface. Then, on the outer peripheral surface of the outer ring 1a, a flat portion 38 perpendicular to the axial direction of the insertion hole 30 is formed on the periphery of the opening of the insertion hole 30 as shown in FIG. Then, the insertion portion 36, which is a portion near the tip of the sensor unit 39 corresponding to the holder holding the sensor, is inserted into the insertion hole 30. This sensor unit 3
Reference numeral 9 denotes an IC incorporating a magnetic detection element such as a Hall element or a magnetoresistive element (MR element) for changing characteristics according to the flow direction of magnetic flux, and a waveform shaping circuit for adjusting an output waveform of the magnetic detection element; A pole piece or the like made of a magnetic material for guiding a magnetic flux from the permanent magnet (or flowing into the permanent magnet) to the magnetic detection element is embedded and held in a synthetic resin holder. Further, an end of a harness 40 for sending an output signal output as a shaped waveform from the IC to a controller (not shown) is directly connected to the sensor unit 39 (without a connector or the like).

The sensor unit 39 has an insertion portion 36 provided at a position closer to the front end (lower end of FIGS. 1, 3, and 4), and a base end side of the insertion portion 36 (upper end of FIGS. 1, 3, and 4). ), An outward flange-shaped flange portion 42 corresponding to the positioning portion. The insertion portion 36 includes a cylindrical base end insertion portion 37 that can be inserted through the insertion hole 30 without play, and a prismatic front end insertion portion 41 having a rectangular cross section.
Further, on the outer surface of the distal end portion (left side surface in FIG. 1) of the distal end side insertion portion 41, a detection portion facing the inner side surface (right side surface in FIG. 1) of the permanent magnet constituting the encoder 3a is provided. A locking groove 43 is formed on the outer peripheral surface of the intermediate portion of the base side insertion portion 37 over the entire circumference.
A sealing member such as an O-ring 44 is locked to 3. In a state where the proximal insertion portion 37 is inserted through the insertion hole 30,
The O-ring 44 is elastically compressed between the inner peripheral surface of the insertion hole 30 and the bottom surface of the locking groove 43, and the outer peripheral surface of the proximal insertion portion 37 and the inner peripheral surface of the insertion hole 30. Seal between surfaces. That is, the O-ring 44 prevents foreign matter such as muddy water from entering the inside of the outer ring 1a through the insertion hole 30. In this way, by sealing between the outer ring 1a and the insertion portion 36 of the sensor unit 39, foreign substances such as magnetic powder are prevented from adhering to the side surfaces of the permanent magnets constituting the encoder 3a, and the rotation is prevented. This prevents the speed detection accuracy from deteriorating. As a seal ring for sealing between the outer ring 1a and the insertion portion 36 of the sensor unit 39, instead of the above-described O-ring 44, another X-ring having an X-shaped cross section is used. If a seal ring is used, the force required to insert the proximal insertion portion 37 of the sensor unit 39 into the insertion hole 30 can be reduced, and the mounting work of the sensor unit 39 can be facilitated. . Further, the sealing member may be a sheet-like packing sandwiched between the flange portion 42 and the flat portion 38. By forming the distal end side insertion portion 41 into a prismatic shape, the axial distance between the encoder 3a and the sealing member 31 opposed to each other with the sensor unit 39 interposed therebetween can be reduced, and the rotational speed can be detected. The axial dimension of the entire rolling bearing unit with the device can be reduced. Further, in this example, a part of the cylindrical portion 35 of the hermetic seal member 31 is extended to a position where the cylindrical portion 35 hangs over the opening of the insertion hole 30 (a part of the inner end opening of the insertion hole 30 is closed). I have. Thus, a necessary fitting area between the outer ring 1a and the cylindrical portion 35 is secured without increasing the axial dimension of the outer ring 1a.

The inner peripheral side surface (lower surface in FIG. 1) of the flange portion 42 provided at the base end of the sensor unit 39 and functioning as a positioning portion is a flat surface, which is in contact with the flat portion 38 formed on the outer ring 1a. The outer ring 1a is brought into contact with the outer ring 1a by a connecting spring 45 described below. The coupling spring 45, which is an elastic member, is formed by bending a metal wire having elasticity and corrosion resistance, such as stainless steel spring steel or chrome-plated spring steel, as shown in FIG. The coupling spring 45 includes a pair of locking legs 46, 4 formed at both ends.
6, a holding portion 47 formed at an intermediate portion for holding the flange portion 42 toward the flat surface portion 38, and a holding portion 47
And a pair of connecting portions 48, 48 for connecting the both ends of the base member to the base ends of the locking legs 46, 46. The locking legs 46 are bent coaxially and arranged coaxially. In addition, the above-mentioned holding part 47
A pair of curved portions 49, 49 each formed in an intermediate portion and each having an arc shape slightly smaller than a quadrant arc, and provided at a central portion sandwiched between the curved portions 49, 49; 48, 48, the knob 5 bent in the opposite direction
1 and straight portions 50, 50 present at both ends and bent in opposite directions. Also, each of the connecting portions 48, 48
Is formed by arranging first circular arc portions 52, 52 provided on the distal end side and second circular arc portions 53, 53 provided on the proximal end side in series. Each of these arc portions 52 and 53 is curved in a direction in which the outside of the coupling spring 45 becomes convex. The portions between the first and second arc portions 52 and 53 are defined as first locking portions 54 and 54, and the second arc portions 53 and 53, which are portions closer to the center of the coupling spring 45. One end portions are second locking portions 55, 55.

In order to pivotally support the tips of the locking legs 46, 46 constituting such a coupling spring 45, the outer peripheral surface of the outer ring 1a has a diametrically opposite side 2 centered on the insertion hole 30. A pair of (bottomed) recessed holes 56 that do not penetrate to the inner peripheral surface of the outer ring 1a are provided concentrically with each other at the location. Thus, these concave holes 56 are formed in the outer ring 1a.
The reason for not penetrating to the inner peripheral surface of the outer ring 1a is to prevent foreign substances such as muddy water sprayed from the outside onto the outer peripheral surface of the outer ring 1a from entering the inside of the outer ring 1a. Then, the locking legs 46, 46 are locked in the concave holes 56, and the coupling spring 45 is connected to the outer race 1a by the 1
A pair of locking legs 46, 46 are supported so as to be swingable about the center.

Each of the locking legs 46 is provided with a corresponding one of the recesses 5.
6, the distance D between the tips of the locking legs 46, 46 when the coupling spring 45 is in the free state.
₄₆ is sufficiently smaller than the distance D ₅₆ (not shown) between the openings of the pair of concave holes ₅₆ (D ₄₆ <D ₅₆ ).
In the free state of the coupling spring 45, the interval between the pair of first locking portions 54, 54 and the interval between the pair of second locking portions 55, 55 are as follows. Regulations. That is, while the gaps between the locking legs 46, 46 are elastically pushed apart, and the locking legs 46, 46 are locked in the recesses 56, the coupling spring 45 is When swinging around the engaging portions between the locking legs 46, 46 and the respective concave holes 56, the first locking portions 54, 54 and the second locking portions 55, 55 A small interference with the inner end surface of the outer ring 1a limits the swing displacement of the coupling spring 45. In the illustrated example, the pair of concave holes 56 is used.
Are formed at diametrically opposite positions of the outer ring 1a, however, the pair of concave holes 56 may not necessarily be provided at diametrically opposite positions if they are formed concentrically with each other. For example, the recesses 56 may be formed at positions that are circumferentially deviated from the positions shown in the drawing in order to increase the depth of each recess 56 in order to increase the amount of engagement of the engagement legs 46, 46.

On the other hand, a base end surface of the flange 42 provided on the sensor unit 39 (a surface opposite to the distal end insertion portion 41 and an upper end surface in FIGS. 1, 3, and 4) is provided with the coupling spring 45. A holding groove 57 for engaging the holding portion 47 without play is formed. The holding groove 57 includes a curved portion 58 provided so as to surround the base end of the harness 40 and a curved portion 5.
8 are bent in opposite directions from both ends, and the flange 42
And a pair of straight portions 59, 59 which are opened at the outer peripheral edge of. Also, at a portion of the base end surface of the flange 42 near the outer periphery,
A portion facing the convex side of the curved portion 58 has an inclined surface 60.
Is formed. The inclined surface 60 is inclined in such a direction that the thickness of the flange 42 becomes smaller toward the edge of the flange 42. The holding groove 57 is provided with the coupling spring 4.
In a state in which the holding portion 47 of the fifth embodiment is engaged, the holding portion 47 is prevented from being accidentally detached, and the sensor unit 39 is positioned in the insertion hole 30 in the circumferential direction. Note that, without forming the flat end portion 38 on the outer ring 1a, the inner peripheral side surface of the flange portion 42 functioning as a positioning portion of the sensor unit 39 is formed as an arc-shaped concave surface having a cross section having the same curvature as the outer peripheral surface of the outer ring 1a. You can do it. Since the processing of such a concave surface can be performed with high precision, the positioning of the sensor unit 39 in the circumferential direction (the rotation direction in the insertion hole 30) can be performed more accurately.

In order to form the rolling bearing unit with the rotation speed detecting device of the present invention by combining the respective members configured as described above, the operation of mounting the sensor unit 39 on the outer ring 1a is as follows. Perform in the same manner. First, when the coupling spring 45 is coupled to the outer ring 1a,
While expanding the distance between the locking legs 46 of the coupling spring 45 against the elasticity, the distance between the locking legs 46, 46 is increased.
6 is inserted into each of the concave holes 56, and each of the locking legs 4
6 and 46 are engaged in the respective concave holes 56 so as to be swingably displaceable. Then, the coupling spring 45 is connected to each of the locking legs 46,
The pivot 47 is pivoted counterclockwise in FIG. 6 so that the pressing portion 47 approaches the insertion hole 30. With this swing, the pair of first locking portions 54 abut against the inner end surface of the outer ring 1a. When the coupling spring 45 is further swung in this state, as shown in FIGS. 6 and 7, the first locking portions 54 and 54 are elastically deformed diametrically outward while the outer periphery of the outer ring 1 a Get on the face. However, the pair of second locking portions 55, 55 abut against the inner end surface of the outer race 1 a, and the holding portion 47 is further moved to the insertion hole 3.
The coupling spring 45 is prevented from swinging in a direction approaching zero (counterclockwise in FIG. 6). In this state, since the first locking portions 54, 54 elastically press the outer peripheral surface of the outer race 1a, the coupling spring 45 moves the holding portion 47 away from the insertion hole 30 (see FIG. (Clockwise direction of No. 6) does not inadvertently swing. Therefore, in this state, the coupling spring 45 is temporarily fixed to the outer ring 1a, and prevents the coupling spring 45 from wobbling during the operation of transporting the rolling bearing unit with the rotation speed detecting device and the operation of assembling the vehicle with the vehicle.

From the manufacturer of the rolling bearing unit with the rotation speed detecting device to the automobile assembling factory, the first locking portions 54 are mounted on the outer peripheral surface of the outer ring 1a and the coupling spring 45 is connected to the outer ring 1a. Delivered while temporarily fixed to 1a. In this state, the diameter of the circumscribed circle of the coupling spring 45 is set to be smaller than the inner diameter of the knuckle support hole 69 (FIG. 7) and the outer diameter of the large diameter portion 62 of the outer shaft 1a. Accordingly, the coupling spring 45 hinders the operation of supporting the rolling bearing unit with the rotation speed detecting device on the suspension of the automobile while inserting the large diameter portion 62 of the outer race 1a into the support hole 69 of the knuckle. There is no. Further, the rolling bearing unit with the rotation speed detecting device is connected to the shaft 29 of the constant velocity joint 28.
When joining with the constant velocity joint 28,
The outer peripheral surface of the conical bell portion 61, whose diameter increases toward the inside of the vehicle, presses the pressing portion 47 that constitutes the coupling spring 45, and pushes the second locking portions 55, 55 in the diametrical direction. While displacing outward, the connecting spring 45 is
Press counterclockwise. As a result, each of the second locking portions 55 rides on the outer peripheral surface of the outer ring 1a.

The rolling bearing unit with the rotational speed detecting device is provided with the outer ring 1a inside the knuckle support hole 69 and the coupling spring 45 as described above in the automobile assembly factory.
The large diameter portion 62 of the outer race 1a is fitted into the support hole 69. At the same time, the hub 2
a is spline-engaged with the shaft 29 of the constant velocity joint 28. At this time, as described above, the holding portion 47 constituting the coupling spring 45 abuts on the outer peripheral surface of the bell portion 61 of the constant velocity joint 28, and the bell portion 61 presses the holding portion 47, and The holding portion 47 is inserted into the insertion hole 30.
The coupling spring 45 is swung in a direction approaching. Therefore, in this state, the second locking portions 55 ride on the outer peripheral surface of the outer race 1a, and the coupling spring 45 can be swung with a small force. However, as shown in FIG. 8, when no force is applied to the coupling spring 45, the holding portion 47 remains in contact with the bell portion 61, and the holding portion 47 opens the insertion hole 30. The holding section 47 does not block the insertion of the sensor unit 39 into the insertion hole 30.

Next, as shown in FIG. 9, the insertion portion 36, which is a portion near the front end of the sensor unit 39, is inserted into the inside of the insertion hole 30. Further, as shown in FIG. Is brought into contact with the flat portion 38 of the outer race 1a. In this state, a desired thickness dimension (for example, 0 mm) is provided between the detecting portion provided on the distal end surface of the distal end side insertion portion 41 constituting the sensor unit 39 and the inner surface of the permanent magnet constituting the encoder 3a. The size of each part is regulated so that a minute gap (about 0.5 mm) exists.

Next, as shown in FIG.
5 by pulling the knob 51 provided at the intermediate portion of the holding portion 47,
The coupling spring 45 swings counterclockwise in FIG. 10 in a direction in which the pressing portion 47 approaches the insertion hole 30. In this state, since both of the first and second locking portions 54 and 55 ride on the outer peripheral surface of the outer race 1a, the coupling spring 45 can swing with a small force. Then, as shown in FIG. 11, the holding portion 47 is engaged with a holding groove 57 provided on the base end surface of the sensor unit 39. At this time, the holding section 47 is connected to the sensor unit 3.
Since the vehicle rides on the inclined surface 60 provided on the upper end surface of the flange portion 42 of the ninth, the engagement with the holding groove 57 can be easily performed.

As described above, when the holding portion 47 is engaged with the holding groove 54, the holding portion 47 of the connecting spring 45 causes the flange portion 42 to move by the elasticity of the connecting spring 45 itself. The sensor unit 39 is fixed to the outer ring 1a by pressing down on the flat portion 38 of the outer ring 1a with a sufficiently large force (for example, about 10 kgf). Since the engagement force between the holding portion 47 and the holding groove 54 is sufficiently large, the coupling spring 45 does not come off from the sensor unit 39 due to vibrations or the like during running of the automobile. In addition, the above-mentioned holding part 4
7 and the holding groove 54, the sensor unit 3
9 is prevented from rotating inside the insertion hole 30. Therefore, it is possible to reliably maintain the state in which the detection unit of the sensor and the inner side surface of the encoder 3a face each other.

For replacement and repair, etc., the sensor unit 3
When removing 9 from the outer ring 1 a, first, the holding portion 47 of the coupling spring 45 is removed from the holding groove 57 of the sensor unit 39, contrary to the mounting operation described above. In this removing operation, first, the knob 51 of the holding portion 47 is picked, and the coupling spring 45 is swung in a direction in which the holding portion 47 moves away from the insertion hole 30. With the swing, the holding portion 47 comes out of the holding groove 57 while being displaced radially outward. After removing the holding portion 47 from the holding groove 57 in this manner, the insertion portion 36 of the sensor unit 39 is pulled out from the inside of the insertion hole 30.

The operation of engaging or disengaging the holding portion 47 of the coupling spring 45 with the holding groove 57 of the sensor unit 39 is easier and easier than the operation of tightening or loosening the set screw. Can be done quickly. Therefore, according to the present invention, the time required for the work of attaching and detaching the sensor unit 39 to and from the outer ring 1a is reduced, and the cost required for assembling the rolling bearing unit with the rotation speed detecting device itself, and the cost required for replacement and repair. Can be reduced.

Next, FIGS. 12 and 13 show a second example of the embodiment of the present invention. In the case of this example, unlike the structure of the first example described above, the outer ring 1b is not provided with the insertion hole 30 (see FIGS. 1 and 2), and the structure of the rolling bearing is a general-purpose double-row rolling bearing structure. That is, the step 63 provided on the hub 2b
, A pair of inner rings 7a and 7b having inner ring tracks 8 and 8 provided on the outer peripheral surface are externally fitted and fixed. The outer ring 1b provided with the double-row outer ring tracks 5, 5 facing the inner ring tracks 8, 8 is fitted and fixed in the support holes 65 of the knuckle 64, which is a fixing member. A plurality of rolling elements 9, 9 are provided between the inner raceways 8, 8 and the outer raceways 5, 5, respectively. Also, the hub 2b is attached to the inner end of the inner ring 7a.
The encoder 3a which rotates together with it is fixed to the outside.

In particular, in the case of this embodiment, an insertion hole 30a is formed in a part of the knuckle 64, which is a fixing member for fixing the outer ring 1b therein, facing the encoder 3a, and the outer peripheral surface of the knuckle 64 is formed. It is provided so as to penetrate the inner peripheral surface. The insertion portion 36 of the sensor unit 39 is inserted inside the insertion hole 30a. This insertion part 3
The detector provided on the outer surface of the distal end portion of the distal insertion portion 41 provided on the distal side of 6 faces the inner surface of the encoder 3a. In the case of the rolling bearing unit with the rotation speed detection device of the present embodiment configured as described above, the time required for the operation of attaching and detaching the sensor unit 39 to and from the knuckle 64 is reduced, and the cost of the rolling bearing unit with the rotation speed detection device itself is reduced. The cost required for repair can be reduced. That is, such an operation is the same as that of the above-described first example except that the outer ring is replaced with a knuckle.

In this embodiment, no seal structure is provided between the outer race 1b and the constant velocity joint 28. Instead, seal assemblies 66a and 66b are provided between both ends of the outer ring 1b and the inner ring 7a to seal the openings at both ends of the space where the plurality of rolling elements 9 and 9 are present. The inner (rightward in FIGS. 12 and 13) seal assembly 66a of the pair of seal assemblies 66a and 66b slides the leading edge of a seal lip 68 constituting a seal ring 67 on the side surface of the encoder 3a. It is composed by things. The feature of the present invention lies in the structure of a portion where a holder holding a sensor is mounted on a part of an outer ring or a fixed member. The structure of the rotational speed detecting device including the sensor and the encoder is not limited to the magnetic detecting type as shown in the figure, but may be any of various conventionally known structures such as an overcurrent type and a photoelectric type.

[0036]

Since the present invention is constructed and operates as described above, the labor required for attaching and detaching the holder holding the sensor to the outer ring or the fixing member to which this outer ring is fitted and fixed can be reduced. The cost of the rolling bearing unit with the rotation speed detecting device itself and the cost required for repair can be reduced.

[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 an outer ring to which a sealing member is attached.

FIG. 3 is a perspective view showing only an end portion of a harness and a sensor unit.

FIG. 4 is a perspective view seen from above in FIG. 3;

FIG. 5 is a perspective view of a coupling spring for coupling the sensor unit and the outer ring.

FIG. 6 is a partial side view showing a state in which a coupling spring is temporarily fixed to the rolling bearing unit.

FIG. 7 is a view seen from the right side of FIG. 6;

FIG. 8 is a view similar to FIG. 6, showing a state in which a rolling bearing unit to which a coupling spring is temporarily fixed is coupled to a constant velocity joint;

FIG. 9 is a view similar to FIG. 6, showing a state where the sensor unit is mounted on the rolling bearing unit in the state of FIG. 8;

FIG. 10 is a view similar to FIG. 6, showing a state in which a coupling spring is swung to couple and fix the sensor unit to the rolling bearing unit.

FIG. 11 is a view similar to FIG. 6, showing a state in which the swing of the coupling spring has been completed and the rolling bearing unit and the sensor unit have been coupled and fixed.

FIG. 12 is a half sectional view showing a second example of the embodiment of the present invention.

FIG. 13 is an enlarged view of a portion A in FIG. 12;

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

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

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1, 1a, 1b Outer ring 2, 2a, 2b Hub 3, 3a Encoder 4 Sensor 5 Outer ring raceway 6 Nut 7, 7a Inner ring 8 Inner ring raceway 9 Rolling element 10 Cage 11 Flange 12 Mounting part 13 Seal ring 15 Cylindrical part 16 Circle ring Part 17 Through-hole 18 Cover 19 Fitting cylindrical part 20 Blocking plate part 21 Swelling part 22 Through-hole 24 Detecting part 25 Mounting flange 26 Set screw 27 Stud 28 Constant velocity joint 29 Shaft 30, 30a Insertion hole 31 Sealing seal member 32 Core Gold 33 Ring part 34 Seal lip 35 Cylindrical part 36 Insertion part 37 Base end side insertion part 38 Flat part 39 Sensor unit 40 Harness 41 Tip side insertion part 42 Flange part 43 Lock groove 44 O ring 45 Coupling spring 46 Lock leg Part 47 suppressing part 48 connecting part 49 curved part 50 linear part 51 knob part 52 first circular arc part 53 Second arc portion 54 First locking portion 55 Second locking portion 56 Concave hole 57 Suppression groove 58 Curved portion 59 Linear portion 60 Inclined surface 61 Bell portion 62 Large diameter portion 63 Step portion 64 Knuckle 65 Support hole 66a, 66b Seal assembly 67 Seal ring 68 Seal lip 69 Support hole

Claims (1)

[Claims] 1. An outer ring having an outer raceway on an inner peripheral surface and not rotating even during use, an inner race having an inner raceway facing the outer raceway on the outer peripheral surface and rotating during use, the outer raceway and the outer raceway. A plurality of rolling elements rotatably provided between the inner ring raceway and a circumferentially fixed characteristic fixed to a part of the inner ring so as to be concentric with the inner ring; An outer ring or a part of a fixing member in which the outer ring is fitted and fixed in a state where the detector is opposed to a part of the encoder. In a rolling bearing unit with a rotation speed detecting device having a sensor that changes an output signal in response to a part of the outer ring or a part of the fixed member facing a part of the encoder, the sensor is provided. At least the number of holders held There is also provided an insertion hole into which a portion close to the front end can be inserted, and a part of the holder holding the sensor, which departs from the front end portion, is brought into contact with the peripheral edge of the opening of the insertion hole, A positioning portion for positioning the holder holding the sensor in the axial direction of the insertion hole is provided, a part of the outer ring or a part of the fixing member, and a part of the holder holding the sensor. By providing an elastic member with the other part engaged, the positioning portion is pressed against the peripheral edge of the opening of the insertion hole, and the holder holding the sensor is detachable from the outer ring or the fixing member. A rolling bearing unit with a rotation speed detecting device, which is mounted on a bearing.