JP2005265826A - Bearing device with sensor - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a bearing device with a sensor which has a low cost, an accurate mounting of the sensor, excellent in a reliability, and responding easily to the various and different size bearing part. <P>SOLUTION: An encoder 17 of a rotation sensor part 2 is attached to an inner part 4 of the bearing part 1. The sensor 18 is attached in an edge part of an external part 3 via a sensor mounting part 22. The sensor mounting part 22 has a fastening cylinder part 22a fitting to an outer diameter face of the external part 3 and a side plate part 22b positioned by axially contacting with an end face of the external part 3. On the side plate part 22b of the sensor mounting part 22, the opposite plate parts of the inner and outer sides which meet mutually are prepared, then the sensor 18 is attached between the opposite plate parts of the inner and outer sides at clamping state. In this case, at the side plate part 22b of the sensor mounting part 22, a U-shaped recessed plate part 25 swelling outward as a cross section shape around a radial direction is formed. A bottom part of this recessed plate part 25 can be used as a previous opposite plate part of the outer side. The sensor mounting part 22 is made as a doubly accumulated shape of an inner plate 23 and an external plate 24. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to a wheel bearing with a rotation sensor in an automobile and a sensor-equipped bearing device for various other purposes.

2. Description of the Related Art A vehicle wheel bearing device is provided with a rotation sensor that detects a wheel rotation speed for control of an antilock brake device and various other purposes. This rotation sensor is composed of a ring-shaped magnetic encoder attached to an inner ring serving as a rotating raceway ring, and a sensor attached to an outer ring serving as a stationary raceway ring to detect the magnetic encoder in a non-contact manner. .
As a configuration example for mounting the sensor, a sensor mounting member made by sheet metal press working has been proposed (for example, Patent Document 1). In this proposed example, a notch hole is provided in an annular support that is fitted and attached to the outer ring, and a pair of sliding groove forming parts for fitting both sides of the sensor is provided on both side edges of the notch, A tongue piece for pressing the back surface of the sensor is provided at the lower edge of the notch hole.

As another configuration example for mounting the sensor, an annular sensor holder is molded integrally with an outer ring fitting cylinder to be fitted to the outer ring, and the sensor element is placed in an arc-shaped holding portion provided in a part of the sensor holder. Is embedded (for example, Patent Document 2).
JP-A-6-308145 JP 2003-254985 A

The mounting structure in which the sensor is inserted between the sliding groove forming portions and pressed with the tongue piece has an advantage that it can be easily mounted, but there is a possibility that it may come off unexpectedly. Further, since the wheel bearing device is in an environment where it is exposed to the road surface, earth and sand are likely to enter between the sensor and the magnetic encoder, which may cause damage.
In the above other mounting configuration examples, since the sensor holder in which the sensor element is embedded and the outer ring fitting cylinder are integrally molded, each size is different for each sensor-equipped bearing device having different sizes such as vehicle type and bearing capacity. It is necessary to manufacture different sensor holders, which increases the cost.

  SUMMARY OF THE INVENTION An object of the present invention is to provide a sensor-equipped bearing device that can reliably mount a sensor, is excellent in reliability, can be easily adapted to bearing portions of various sizes, and can be manufactured at low cost.

A bearing device with a sensor according to the present invention includes an outer member having a raceway surface on an inner periphery, an inner member having a raceway surface facing the raceway surface, and a bearing portion having a rolling element interposed between both raceway surfaces; A sensor-equipped bearing device comprising: an encoder attached to an end portion of the inner member; and a rotation sensor portion having a sensor attached to the end portion of the outer member so as to face the encoder. A sensor is attached by a member.
The sensor mounting member is provided with a sensor mounting member having a fitting tube portion that fits to the outer diameter surface of the outer member, and a side plate portion that is positioned in the axial direction in contact with the end surface of the outer member. The side plate portion of the sensor mounting member is provided with inner and outer facing plate portions facing each other, and the sensor is mounted between the inner and outer facing plate portions.

  According to this configuration, since the sensor is mounted in a state of being sandwiched between the inner and outer opposing plate portions provided on the sensor mounting member, the sensor is difficult to be removed, the mounting is reliable, and the reliability is high. The sensor mounting member is fitted to the outer diameter surface of the outer member at the fitting tube portion, and is positioned in the axial direction by contacting the end surface of the outer member at the side plate portion. The positioning accuracy for the encoder can be excellent. The sensor is, for example, a sensor element embedded in a sensor holder made of resin or the like. The sensor holder is manufactured separately from the sensor mounting member and is attached to the sensor mounting member. Therefore, when mounting on bearing parts of different sizes, it can be dealt with by adjusting the sensor mounting member to the size of the bearing section. It can correspond to the part. Therefore, a sensor unit including the sensor and the sensor mounting member can be manufactured at low cost.

The sensor mounting member may be provided with a recessed plate portion whose inner surface side is recessed in the side plate portion, and the bottom surface portion of the recessed plate material is used as the outer opposing plate portion. The dent plate portion has, for example, a U-shaped cross section along the bearing radial direction.
When the concave plate portion is provided, the sensor is fitted into the concave plate portion, and is sandwiched between the outer opposed plate portion formed by the bottom plate portion and the inner opposed plate portion facing the sensor. Is more reliable and reliable.

The sensor mounting member may have a side plate portion having the inner and outer opposing plate portions over the entire circumference.
When the inner and outer opposing plate portions are formed on the entire circumference of the side plate portion, the shape of the sensor mounting member becomes simple and the manufacture thereof becomes easy.

The sensor mounting member is made of, for example, two inner plates and an outer plate made of metal plates that overlap each other. The inner plate and the outer plate are provided with the inner facing plate portion and the outer facing plate portion, respectively. When providing the said dent plate part, the said dent plate part is provided in the said outer plate.
When the sensor mounting member is composed of an inner plate and an outer plate that overlap each other, the operation of sandwiching the sensor between the inner and outer opposing plate portions of the sensor mounting member can be easily performed.

The sensor mounting member has a sensor mounting opening in which the inner and outer opposing plate portions penetrate the sensor inward and outward, and an overhanging portion where the sensor projects over a part or the whole of the sensor mounting opening. The overhanging portion may be sandwiched between the inner and outer opposing plate portions.
If the sensor mounting opening is provided in the opposing plate portion on the inner side of the side plate portion of the sensor mounting member, the sensor can be directly opposed to the encoder without using the side plate portion. Further, when the sensor mounting opening is provided in the outer facing plate portion, it is easy to draw the wiring to the outside. When these sensor mounting openings are provided, it is possible to position the sensor in the radial direction or the circumferential direction of the bearing portion by fitting the outer periphery of the sensor into the sensor mounting opening.

In the present invention, an elastic body may be interposed between the inner plate or the outer plate portion or both of the opposing plate portions and the sensor. When providing the said recessed board part, an elastic body is interposed between the outer opposing board part used as the baseplate part or the inner opposing board part facing this, and a sensor.
By interposing the elastic body, the sensor can be stably mounted without rattling the sensor mounting member and without generating an excessive clamping force.

The elastic body may also serve as a seal that seals between the inner member and the sensor mounting member. For example, the elastic body is configured such that the inner peripheral edge of the elastic body is in sliding contact with the outer peripheral surface of the inner member.
In this case, the elastic body can be used for both the stable mounting of the sensor and the sealing means, and the sealing performance can be improved without increasing the number of parts. Further, by sealing the space between the inner member and the sensor mounting member with the elastic body in this way, foreign matter is not caught between the encoder and the sensor, and this sensor-equipped bearing device can be used as a wheel bearing device or the like. Even when applied to the above, sand particles are prevented from being caught between the encoder and the sensor due to the rock jumping from the road surface.

In addition, when the outer ring, which is one joint member of the constant velocity joint, is coupled to the inner member, the elastic body is in sliding contact with the outer ring of the constant velocity joint, and between the outer ring and the sensor mounting member. It is good also as what has a lip part which plugs up the gap of the generated axial direction.
When a sealing lip portion is provided on the elastic body, a sealing effect can be obtained regardless of whether the sealing member closes the radial gap or the axial clearance. However, if the gap in the radial direction is closed, the lip may be swollen at the time of assembly, and the assemblability is poor, but if the lip part closes the gap in the axial direction, It is difficult for the lip part to be broken during assembly.

  In the present invention, the encoder and sensor may be magnetic or optical. In the case of the magnetic type, for example, the encoder is a magnetic encoder in which magnetic poles are alternately formed in the circumferential direction, and the sensor is a magnetic sensor using a Hall element, a magnetoresistive element, or the like.

The sensor-equipped bearing device of the present invention can be applied to bearings for various uses, for example, a wheel bearing device. In that case, the bearing portion has an outer member having a double row raceway surface on the inner periphery, an inner member having a raceway surface facing each of the raceway surfaces, and a double row interposed between the opposing raceway surfaces. The rolling elements are provided so that the wheels are rotatably supported with respect to the vehicle body.
In the case of a wheel bearing device, since it is subjected to vibration and placed on a road surface in a harsh environment where dust or salty mud water is applied, the advantage that the sensor according to the present invention is reliably mounted and excellent in reliability is effective. To be demonstrated. Further, it is easy to cope with wheel bearing devices of various sizes, and the cost can be reduced.

  A bearing device with a sensor according to the present invention is provided with a sensor mounting member having a fitting tube portion that fits on an outer diameter surface of an outer member, and a side plate portion that is in contact with an end surface of the outer member and is axially positioned. The sensor mounting member is provided with inner and outer facing plate portions facing each other, and the sensor is sandwiched between the inner and outer facing plate portions. Is reliable, excellent in reliability, easily compatible with bearings of various sizes, and can be produced at low cost.

A first embodiment of the present invention will be described with reference to FIGS. This embodiment is applied to a third-generation type wheel bearing device. This bearing device with a sensor is obtained by attaching a rotation sensor portion 2 to a bearing portion 1, and FIG. 1 (A) shows a state in which a constant velocity joint 14 is connected.
The bearing portion 1 includes an outer member 3 in which a double-row raceway surface 5 is formed on the inner periphery, an inner member 4 in which a raceway surface 6 facing each of the raceway surfaces 5 is formed, the outer member 3 and the inner member It is comprised with the double row rolling element 7 interposed between the track surfaces 5 and 6 of the direction member 4. FIG. The rolling elements 7 in each row are held by a cage 8. Both ends of the bearing space between the outer member 3 and the inner member 4 are sealed by seals 9 and 10, respectively.

The outer member 3 is formed of an integral part, and a flange 3a that is attached to a knuckle or the like in a vehicle suspension system (not shown) is provided on the outer periphery.
The inner member 4 includes a hub wheel 11 having a wheel mounting flange 11a at an outboard side end, and an inner ring 12 fitted to the outer periphery of the inboard side end of the hub wheel 11. The inner ring 12 is provided with each row of raceway surfaces 6 in the double row raceway surface 6. The outboard side refers to the side closer to the outside in the vehicle width direction with the wheel bearing device attached to the vehicle, and the side closer to the center is referred to as the inboard side.

  The inner member 4 has a central hole 13, and a stem portion 15 a of an outer ring 15 that serves as one joint member of the constant velocity joint 14 is inserted therethrough. The stem 15 a has a male screw portion at the tip, and the constant velocity joint outer ring 15 is coupled to the inner member 4 by tightening a nut 16 that is screwed into the male screw portion. At this time, the step surface 15 b provided on the constant velocity joint outer ring 15 presses the width surface of the inner ring 12 of the inner member 4, whereby the inner ring 12 is fixed to the hub ring 11.

As shown in an enlarged view in FIG. 2, the rotation sensor unit 2 includes an encoder 17 attached to the outer periphery of the end of the inner member 4 and a sensor 18 attached to the end of the outer member 3 so as to face the encoder 17. Have
The encoder 17 is a magnetic encoder, and is provided with a multipolar magnet 17b on the side plate portion of an annular cored bar 17a having an L-shaped cross section. The encoder 17 is attached to the inner member 4 by press-fitting the cylindrical portion of the cored bar 17 a into the outer periphery of the inner member 4. The multipolar magnet 17b is a member in which magnetic poles N and S are alternately formed in the circumferential direction, and is made of a rubber magnet, a plastic magnet, a sintered magnet, or the like.

  In this embodiment, the encoder 17 also serves as a component of the seal 10 on the inboard side and exhibits a function as a slinger. The seal 10 includes a core bar 17 a of the encoder 17 and a seal member 10 a fitted to the inner diameter surface of the outer member 3. The seal member 10a is an annular cored bar provided with an elastic body such as rubber, and a plurality of lip portions 10c whose tips are in sliding contact with the side plate part and the cylindrical part of the cored bar 17a of the encoder 17, respectively. Is provided.

  The sensor 18 is a magnetic sensor that detects the magnetic field of the encoder 17, and is attached to the outer member 3 via the sensor attachment member 22. The sensor 18 has a sensor element 19 such as a Hall element or a magnetoresistive element embedded in a sensor holder 20 made of resin or the like. In the sensor 18, two magnetic detection elements 19 are provided apart from each other in the circumferential direction so that, for example, two pulse outputs whose electrical phases are shifted by 90 ° with respect to the magnetic pole array of the encoder 17 can be obtained. Yes. For this reason, the main body portion 20a of the sensor holder 20 of the sensor 18 has a front shape extending in an arc shape concentric with the bearing center. The sensor holder 20 has a protruding portion 20b extending from the vicinity of the tip of the main body portion 20a to the outer diameter side, and is provided with a cord cover portion 20c that gradually decreases in diameter from the main body portion 20a and extends rearward with respect to the detection surface. ing. A cord 21 extends from the tip of the cord cover portion 20c. The projecting portion 20b projects from the entire width in the bearing circumferential direction of the main body portion 20a to the outer diameter side.

The sensor mounting member 22 has a fitting cylinder portion 22 a that fits to the outer diameter surface of the outer member 3, and a side plate portion 22 b that contacts the end surface of the outer member 3 and is positioned in the axial direction. The side plate portion 22b is provided with inner and outer facing plate portions 26 and 25a facing each other, and the sensor 18 is attached between the inner and outer facing plate portions 26 and 25a.
Specifically, the side plate portion 22 is provided with a cup-shaped recessed plate portion 25 whose inner surface side is recessed, and the bottom surface portion of the recessed plate portion 25 serves as an outer facing plate portion 25a. The inner facing plate portion 26 is a portion facing the outer facing plate portion 25a composed of the bottom surface portion. The sensor 18 is attached in a sandwiched state between the outer facing plate portion 25a formed of the bottom surface portion of the recessed plate portion 25 and the facing plate portion 26 facing the sensor 18 so as to be fitted into the recessed plate portion 25. .
The concave plate portion 25 has a U-shaped cross-sectional shape along the bearing radial direction. Specifically, the concave plate portion 25 has an arc shape extending in the circumferential direction of the sensor mounting member 22 as shown in FIG. 1 (B), and the outer peripheral side and inner peripheral side that are the arc shape. Both ends of the side are shaped to continue with arcuate sides.

  The sensor mounting member 22 includes an inner plate 23 and an outer plate 24 made of two metal plates that are overlapped on the inside and the outside. The concave plate portion 25 is provided on the outer plate 24, and a part of the inner plate 23 is a part of the inner plate 23. The counter plate portion 26 is formed. In the illustrated example, the inner facing plate portion 26 is formed of a portion facing the recessed plate portion 25 of the outer plate 24 in the side plate portion of the inner plate 23. Each of the inner plate 23 and the outer plate 24 is made of a pressed product of sheet metal.

  The sensor mounting member 22 is attached to the outer member 3 by press-fitting the fitting tube portion 22a into the outer diameter surface of the outer member 3, and then by crimping portions 27 at a plurality of locations in the circumferential direction of the fitting tube portion 22a. It is done by providing. The caulking portion 27 is an embossed protrusion and is provided so as to engage with an engaging groove 28 formed on the outer diameter surface near the end of the outer member 3. The fitting cylinder portion 22a may be attached to the outer member 3 only by press fitting.

  The opposing plate portions 25a and 26 inside and outside the sensor attachment member 22 have sensor attachment openings 29 and 30 that allow the sensor 18 to penetrate inside and outside, and these sensor attachment openings 29 and 30 are sensor holder body portions of the sensor 18. It is set as the shape fitted to the outer periphery of 20a. The sensor 18 has the overhanging portion 20b as described above, and the overhanging portion 20b protrudes from the periphery of the sensor mounting openings 29 and 30 to the bearing outer diameter side. This overhanging portion 20 b is sandwiched between the opposing plate portion 25 a formed from the bottom surface portion of the recessed plate portion 25 and the inner opposing plate portion 26.

In the side plate portion 22 b of the sensor mounting member 22, a ring-shaped elastic body 31 is sandwiched between the inner plate 23 and the outer plate 24, and the elastic body 31 is an inner surface of the recessed plate portion 25 in the sensor mounting member 22. It is interposed between the whole and the sensor 18. The elastic body 31 is made of a sheet-like rubber material or the like. The elastic member 31 has a lip portion 31 a protruding from the inner peripheral edge of the side plate portion 22 b of the sensor mounting member 22, and the lip portion 31 a is in sliding contact with the outer diameter surface of the constant velocity joint outer ring 15. The lip portion 31 a serves as a seal that seals between the inner member 4 and the sensor mounting member 22.

  According to the sensor-equipped bearing device with this configuration, the sensor 18 is disposed between the opposing plate portion 25a formed of the bottom surface portion of the recessed plate portion 25 provided in the sensor mounting member 22 and the inner opposing plate portion 26 facing the same. Since the sensor 18 is attached in a sandwiched state, there is no possibility that the sensor 18 will come off. For this reason, the mounting is reliable and the reliability is high. Further, in this embodiment, since the cross section in the bearing circumferential direction of the recessed plate portion 25 is made U-shaped and the sensor holder main body 20a of the sensor 18 is disposed in a fitted state therein, The positioning effect of the sensor 18 can also be obtained. The sensor mounting member 22 is fitted to the outer diameter surface of the outer member 3 by the fitting cylindrical portion 22a, and is positioned in the axial direction in contact with the end surface of the outer member 3 by the side plate portion 22b. It can be performed with high accuracy, and the positioning accuracy of the sensor 18 with respect to the encoder 17 can be excellent. Further, since the sensor 18 is manufactured separately from the sensor mounting member 22 and is mounted on the sensor mounting member 22, the sensor mounting member 22 has the same size as that of the bearing portion 1 when mounted on a wheel bearing device having various sizes. It can be dealt with by combining them. Therefore, the sensor 18 composed of the sensor element 19 and the sensor holder 20 can be used for the bearing portions of different sizes by using the same sensor, and therefore the sensor unit 32 composed of the sensor 18 and the sensor mounting member 22 can be manufactured at low cost. .

  Since the sensor mounting member 22 includes an inner plate 23 and an outer plate 24 that overlap each other, the operation of sandwiching the sensor 18 between the U-shaped recessed plate portion 25 and the opposing plate portion 26 of the sensor mounting member 22 is easy. Can be done.

  Since the sensor attachment member 22 has sensor attachment openings 29 and 30 that allow the sensor 18 to penetrate in and out, the sensor 18 can be directly opposed to the encoder 17 without using the side plate portion 22b. Further, since the sensor mounting opening 30 is provided in the recessed plate portion 25, the cord 21 can be easily pulled out to the outside. In addition, if the sensor mounting openings 29 and 30 are provided, the sensor mounting openings 29 and 30 are arranged so that the outer periphery of the sensor 18 is fitted to the sensor mounting openings 29 and 30, so that the sensor for the radial direction and the circumferential direction of the bearing portion 1 is provided. 18 positioning can be performed, and positioning becomes even easier.

  Since the elastic body 31 is interposed between the opposing plate portion 25a composed of the bottom plate portion of the recessed plate portion 25 of the sensor mounting member 22 and the sensor 18, the sensor 18 does not rattle the sensor mounting member 22. It can be held stably without causing an excessive clamping force. The elastic body 31 may be interposed between the sensor 18 and the counter plate portion 26.

Further, since the lip portion 31 a is in sliding contact with the outer peripheral surface of the constant velocity joint outer ring 15, the elastic body 31 is sealed between the inner member 4 and the sensor mounting member 22. Therefore, no foreign matter is caught between the encoder 17 and the sensor 18, and sand particles are prevented from being caught between the encoder 17 and the sensor 18 due to rock splashes from the road surface, and damage to the sensor 18 and the like is prevented. The Moreover, since the opposing part of the sensor 18 and the encoder 17 is covered with the sensor attachment member 22 and the lip portion 31a of the elastic body 31, the detection surface of the encoder 17 and the sensor 18 from salty muddy water can be obtained.
Since the elastic body 31 is used for both the stable attachment of the sensor 18 and the sealing means, the sealing performance can be improved without increasing the number of parts.

3 and 4 show another embodiment of the present invention. In this embodiment, in the first embodiment described with reference to FIGS. 1 and 2, the inner ring 12 fitted to the hub ring 11 is connected to the hub ring 11 by a caulking portion 11 b obtained by caulking the rear end of the hub ring 11. It is fixed to. The lip portion 31 a of the elastic body 31 provided on the sensor mounting member 22 is configured to be in sliding contact with the crimped portion 11 b of the hub wheel 11 in the inner member 4. Note that the lip portion 31 a may have a tip that is in sliding contact with the end surface of the inner member 4.
In the case of this configuration, the contact of the lip portion 31a of the elastic body 31 does not depend on the coupling state of the constant velocity joint, and the mounting operation of the wheel bearing device to the vehicle body is simple. Other configurations and effects in the present invention are the same as those in the first embodiment.

  5 and 6 show still another embodiment of the present invention. In this embodiment, in the bearing device with a sensor according to the first embodiment shown in FIGS. 1 and 2, the sensor mounting member 22A is arranged so that the side plate portion 22Ab has outer and inner opposing plate portions 25Aa and 26A. It is supposed to have. The sensor 18A is sandwiched between the opposing plate portions 25Aa and 26.

The sensor mounting member 22A has a fitting cylinder portion 22Aa that fits to the outer diameter surface of the outer member 3, and a side plate portion 22Ab that contacts the end surface of the outer member 3 and is positioned in the axial direction. The member 22A is the same as that of the first embodiment in that the member 22A is composed of two inner plates 23 and an outer plate 24 made of metal plates which are overlapped with each other. In this embodiment, the inner plate 23 and the outer plate 24 overlap closely in the fitting cylinder portion 22Aa, but the side plate portion 22Ab has an interval through which the sensor 18A is sandwiched. Each of the inner plate 23 and the outer plate 24 is made of a pressed product of sheet metal.
In this embodiment, parts corresponding to those of the first embodiment are denoted by the same reference numerals, except for portions that need to be distinguished, and redundant description thereof is omitted.

  The sensor mounting member 22A is attached to the outer member 3 by press-fitting the fitting cylinder portion 22Aa into the outer diameter surface of the outer member 3. A sheet-like elastic body 41 made of rubber or the like is fixed to the entire inner periphery of the fitting cylinder portion 22Aa by bonding or the like. The locking projection 41a provided on the inner diameter surface of the elastic body 41 engages with the engagement groove 28 formed on the outer diameter surface near the end of the outer member 3, thereby enhancing the retaining effect. It has been. The fitting cylinder portion 22Aa may be attached to the outer member 3 only by press fitting.

  The opposing plate portions 25Aa and 26A inside and outside the sensor attachment member 22A have sensor attachment openings 29A and 30A that allow the sensor 18A to penetrate inside and outside, and these sensor attachment openings 29A and 30A are sensor holder body portions of the sensor 18A. It is made into the shape fitted to the outer periphery of 20Aa. The sensor 18A has the overhanging portion 20Ab as described above, and the overhanging portion 20Ab protrudes from the periphery of the sensor mounting openings 29A and 30A to the bearing outer diameter side. The bearing outer diameter side end of the overhang portion 20 </ b> Ab protrudes to the vicinity of the outer diameter surface of the end portion of the outer member 4. The overhang portion 20Ab is sandwiched between the pair of opposed plate portions 25Aa and 26A.

  In the sensor attachment member 22A, an elastic body 31A made of a ring-shaped rubber material or the like is sandwiched between the inner plate 23 and the outer plate 24. The elastic body 31A has a sheet shape, and is interposed between the sensor 18 and the outer opposing plate portion 25Aa in the side plate portion 22Ab. The inner peripheral edge 31Aa located on the inner peripheral edge of the sensor mounting member 22A of the elastic member 31A is a thick portion interposed between the outer and inner opposing plate portions 25Aa and 26A, and the outer surface of the outer opposing plate portion 26 is defined as the outer peripheral plate portion 26A. It is provided to cover. A lip 31Ab slidably contacting the step surface 15c facing the axial direction of the constant velocity joint outer ring 15 is provided at the peripheral edge 31Aa of the elastic body. The lip portion 31Ab closes the gap d1 in the direction between the step surface 15c of the constant velocity joint outer ring 15 and the sensor mounting member 22A. The step surface 15c that makes the lip portion 31Aa of the step surface 15c of the constant velocity joint outer ring 15 slidably contact the outer surface of the step surface 15b that is provided on the constant velocity joint outer ring 15 and presses the end surface of the inner ring 12 of the inner member 4. Located on the side. By these cross sections 15b and 15c, the outer peripheral surface of the constant velocity joint outer ring 15 is formed in a step shape.

  Further, an elastic body 42 having a lip portion 42a in contact with the end surface of the inner ring 12 of the inner member 4 is provided on the inner peripheral edge of the opposing plate portion 26A on the inner side of the sensor mounting member 22A, and the sensor mounting member is provided by the lip portion 42a. A gap d2 in the axial direction between the inner diameter portion of 22A and the inner member 4 is closed.

As in the first embodiment, the encoder 17 includes a cored bar 17a having an L-shaped cross section and a multipolar magnet 17b provided on the cored bar 17a. The inboard seal 10A is different from the combination type and seal in the first embodiment, and is configured by a lip portion integrated with the multipolar magnet 17b.
Other configurations in this embodiment are the same as those in the first embodiment.

  Also in this embodiment, since the sensor 18A is sandwiched between the outer and inner opposing plate portions 25Aa and 26A provided on the sensor mounting member 22A, the sensor 18A is not likely to come off. For this reason, the mounting is reliable and the reliability is high. The sensor mounting member 22A has outer and inner opposed plate portions 25Aa and 26A over the entire circumference, and these opposed plate portions 25Aa and 26A are provided on separate outer plate 24 and inner plate 23. Therefore, the configuration is simple and the manufacture is easy, and the sandwiching operation of the sensor 18A is also easy. In the sensor 18A, the protruding portion 20Ab is in contact with the inner diameter surface of the outer cylindrical portion of the outer plate 24 between the opposing plate portions 25Aa and 26A, so that the positioning accuracy in the radial direction of the sensor 18A is increased.

Further, the sensor mounting member 22A is fitted to the outer diameter surface of the outer member 3 by the fitting cylinder portion 22Aa, and is positioned in the axial direction in contact with the end surface of the outer member 3 by the side plate portion 22Ab. It can be performed easily and accurately, and the positioning accuracy of the sensor 18A with respect to the encoder 17 can be excellent. Since the sensor 18A is manufactured separately from the sensor mounting member 22A and is mounted on the sensor mounting member 22A, the sensor mounting member 22A is matched to the size of the bearing portion 1 when mounting on a wheel bearing device of various sizes. It can be dealt with. Therefore, the sensor 18A composed of the sensor element 19 and the sensor holder 20A can be used for the bearings of various sizes using the same sensor, and therefore the sensor unit 32 composed of the sensor 18A and the sensor mounting member 22A can be manufactured at low cost. .
The seal between the sensor mounting member 22A and the constant velocity joint outer ring 15 is provided with a lip portion 31Ab that is slidably contacted by a gap in the axial direction. Therefore, unlike the radial type, the lip portion 31Ab has a problem of blistering during assembly. There is no, and assembly is good.

  In the embodiment shown in FIGS. 5 and 6, the inner ring 12 of the inner member 4 is pushed and fixed by the step surface 15b of the constant velocity joint outer ring 15. However, as shown in FIG. The inner ring 12 of the inner member 4 may be fixed by a caulking portion 11 c provided on the hub ring 11. Also in this case, the sensor mounting member 22A, the sensor 18A, and the encoder 17 are configured in the same manner as in the embodiment of FIGS.

  Further, in the embodiment shown in FIGS. 5 and 6, instead of providing the seal 10A integrated with the encoder 17, as shown in FIG. 8, the elastic body 42 provided on the inner peripheral edge of the sensor mounting member 22A is inward and outward. The sealing effect of this portion may be enhanced by providing the lips 42b and 42c.

In addition, although each said embodiment demonstrated about the case where it applied to the wheel bearing apparatus, this invention is applicable to the radial type rolling bearing which has a rotation sensor part generally.
In each of the above embodiments, the encoder 17 and the sensor units 18 and 18A are magnetic, but may be optical.

(A) is sectional drawing of the bearing apparatus with a sensor which consists of a wheel bearing apparatus concerning 1st Embodiment of this invention, (B) is the front view which shows the sensor attachment member and a sensor. It is a partial expanded sectional view of Drawing 1 (A). (A) is sectional drawing of the bearing apparatus with a sensor which consists of the bearing apparatus for wheels concerning other embodiment of this invention, (B) is the front view which shows the sensor attachment member and a sensor. FIG. 4 is a partially enlarged cross-sectional view of FIG. (A) is sectional drawing of the bearing apparatus with a sensor which consists of a wheel bearing apparatus concerning further another embodiment of this invention, (B) is the partial front view which shows the sensor attachment member and a sensor. It is a partial expanded sectional view of Drawing 5 (A). It is a fragmentary sectional view which shows the modification of the relationship between the sensor attachment member and constant velocity joint in embodiment of FIG. It is a fragmentary sectional view which shows the further another modification of the relationship between the sensor attachment member and constant velocity joint in embodiment of FIG.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 ... Bearing part 2 ... Rotation sensor part 3 ... Outer member 4 ... Inner member 7 ... Rolling body 17 ... Encoder 18, 18A ... Sensor 20, 20A ... Sensor holder 20b, 20Ab ... Overhang | projection part 22, 22A ... Sensor attachment Member 22a, 22Aa ... fitting cylinder part 22b, 22Ab ... side plate part 25 ... dent plate part 25a, 25Aa ... counter plate part 26, 26A ... counter plate part 29, 29A, 30, 30Aa ... sensor mounting opening 31, 31A ... elastic Body 31a, 31Ab ... Lip part

Claims (10)

An outer member having a raceway surface on the inner periphery, an inner member having a raceway surface facing the raceway surface, a bearing portion having a rolling element interposed between the raceway surfaces, and an end portion of the inner member A sensor-equipped bearing device comprising: an encoder attached to the rotation sensor portion; and a rotation sensor portion having a sensor attached to an end portion of the outer member facing the encoder.
A sensor mounting member having a fitting tube portion that fits to the outer diameter surface of the outer member and a side plate portion that is positioned in the axial direction in contact with the end surface of the outer member is provided, and the side plate of the sensor mounting member A sensor-equipped bearing device, characterized in that inner and outer opposing plate portions facing each other are provided in a portion, and the sensor is sandwiched between the inner and outer opposing plate portions.   The bearing device with a sensor according to claim 1, wherein the side plate portion of the sensor mounting member is provided with a concave plate portion having a concave inner surface side, and the bottom portion of the concave plate material is used as the outer counter plate portion.   The sensor-equipped bearing device according to claim 1, wherein the side plate portion of the sensor mounting member has the inner and outer opposed plate portions over the entire circumference.   The sensor mounting member according to any one of claims 1 to 3, wherein the sensor mounting member includes two inner plates and an outer plate made of metal plates that overlap each other, and the inner plate and the outer plate include the inner plate and the outer plate. A bearing device with a sensor provided with a counter plate portion and an outer counter plate portion.   5. The sensor mounting member according to claim 1, wherein the inner and outer opposing plate portions of the sensor mounting member each have a sensor mounting opening that penetrates the sensor inward and outward, and the sensor is a sensor mounting opening. A sensor-equipped bearing device having an overhanging portion that protrudes partially or entirely around the periphery and sandwiching the overhanging portion between the inner and outer opposing plate portions.   6. The sensor-equipped bearing device according to claim 1, wherein an elastic body is interposed between one or both of the inner and outer counter plate portions and the sensor.   The sensor-equipped bearing device according to claim 6, wherein the elastic body also serves as a seal that seals between the inner member and the sensor mounting member.   7. The lip portion according to claim 6, wherein the elastic body has a lip portion that slides on an outer ring of a constant velocity joint coupled to the inner member and closes a gap in an axial direction generated between the outer ring and the sensor mounting member. Bearing device with sensor.   9. The sensor-equipped bearing device according to claim 1, wherein the encoder is a magnetic encoder in which magnetic poles are alternately formed in a circumferential direction, and the sensor is a magnetic sensor.   The bearing according to any one of claims 1 to 9, wherein the bearing portion has an outer member having a double-row raceway surface on an inner periphery, and an inner member having a raceway surface facing each of the raceway surfaces, A sensor-equipped bearing device comprising a double-row rolling element interposed between opposing raceway surfaces, and a wheel bearing for rotatably supporting a wheel with respect to a vehicle body.

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