JP2006038189A - Bearing device with ic tag for wheel - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a bearing device with an IC tag for a wheel by which information regarding a bearing, especially, a preload amount or a bearing gap can be easily confirmed in the bearing device for the wheel to which preload is imparted by caulking. <P>SOLUTION: The bearing device with the IC tag for the wheel is provided with an external member 1 having a raceway face 1a on the inner periphery and an internal member 2 having a raceway face 2a facing the raceway face 1a on the outer periphery. A rolling body 5 is interposed between the raceway faces 1a, 2a of both trains. The internal member 2 is composed of a hub ring 3 having a flange 3a for mounting a wheel and another member 13a connected to the hub ring 3. The raceway face 2a of each train is formed to the hub ring 3 and another member 13a. Another member 13a may be an outer ring of a constant speed universal joint or an independent inner ring. Another member 13a is connected to the hub ring 3 by caulking. The preload of the bearing is imparted by the caulking. A non-contact IC tag 10 capable of executing communication is mounted to the bearing device for a wheel. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a wheel bearing device with an IC tag to which an IC tag capable of communication by non-contact communication is attached.

  IC tags using RFID technology capable of non-contact communication have been miniaturized and have been widely used in logistics. In recent years, the requirement for traceability, that is, the requirement to be able to track the history, application, or location of what is being considered has increased, and IC tags are attached to gears and other various mechanical parts, It has been proposed to store and manage codes and various information associated therewith (for example, Patent Document 1).

  Since the wheel bearing device is a part around the foot of an automobile, there are many cases where it is desired to know identification information and history information at the time of periodic inspection or failure of the automobile after use in order to ensure safety. In the wheel bearing device, management of identification information is performed by engraving each part, computer management, book management, etc. by a bearing manufacturer or an automobile manufacturer.

  Conventionally, in the fourth generation type of wheel bearing device, the hub wheel and the constant velocity universal joint are integrated, and the races of each row on the double row raceway surface are integrated with the hub wheel and the constant velocity universal joint. A surface is formed. In the fourth generation type wheel bearing device, the stem portion of the outer ring of the constant velocity universal joint is expanded to give a preload to the bearing. In the third generation type wheel bearing device, an inner ring is fitted to one end of a hub ring, and a raceway surface of each row is formed on the hub ring and the inner ring. There is one in which the inner ring is fixed to the hub ring in the axial direction to give a preload. By applying this preload, the appropriate bearing rigidity is ensured and the rotational resistance is reduced. The amount of preload is strictly controlled at the time of manufacture because it greatly affects the bearing performance.

On the other hand, in a wheel bearing device, it has been proposed to provide various sensors such as a rotation sensor and a displacement sensor for use in driving posture control of an automobile (for example, Patent Document 2).
JP 2002-049900 A JP 2001-021577 A

In a wheel bearing device, when performing periodic inspections and other necessary inspections, if the bearing serial number is known, various information about the bearings can be examined. In addition, it is possible to check various information about the bearing from the manufacturing number stamped on the wheel bearing device, or the information on the year of manufacture and the manufacturing location. However, the manufacturing number stamped on the wheel bearing device. The information on the year of manufacture, the place of manufacture, etc. can only be understood from the knuckle. Therefore, it takes time to disassemble and reassemble.

  In addition, the wheel bearing device applies preload as described above, but the preload may decrease during use. Preload loss causes an increase in surface pressure due to a narrowing of the load zone, leading to a reduction in bearing life. In the wheel bearing device of the type that applies the preload by the above-described caulking, the preload is strictly managed at the time of manufacture, but the subsequent preload is not managed. When measuring the preload during periodic inspection, etc., it is easy to manage the preload if the initial preload setting at the time of bearing manufacture is known, but it is possible to contact the manufacturer to check the initial preload setting during periodic inspection. It is necessary and complicated.

  A wheel bearing device provided with various sensors as described above leads to higher functions such as driving attitude control of an automobile. However, in actual application, the sensor has a difference in sensitivity. For this reason, in order to operate the control functions such as the running posture control satisfactorily, it is a case where laborious adjustment work is required.

  The proposed example of attaching an IC tag shown in Patent Document 1 is intended for general mechanical parts, and various mechanical parts are exemplified as attachment targets, but there is no disclosure of a wheel bearing device. .

An object of the present invention is to provide a wheel bearing device with an IC tag in which information about the bearing can be easily confirmed in a wheel bearing device to which preload is applied by caulking. In particular, the preload amount or bearing clearance can be easily confirmed.
Another object of the present invention is to facilitate the treatment of setting a wheel bearing device having a load sensor so that proper control of the vehicle can be performed from a detection signal of the load sensor by effectively using an IC tag. It is to plan.

The bearing device for a wheel with an IC tag according to the present invention includes an outer member having a double-row raceway surface on an inner periphery, an inner member having an outer race surface facing the raceway surface, and a raceway surface between both rows. And the inner member comprises a hub wheel having a wheel mounting flange and a separate member coupled to the hub wheel, the hub wheel and the separate member. In the wheel bearing device in which the raceway surface of each row is formed, the separate member is coupled to the hub wheel by caulking, and the bearing preload is applied by the caulking, the wheel bearing device is not contacted A feature is that an IC tag capable of communication is attached.
According to this configuration, since the IC tag is attached to the wheel bearing device, it is possible to record identification information and manufacturing information of the wheel bearing device, and further record manufacturing history information to the IC tag. Since a non-contact update type IC tag is used, recorded information can be read out without removing the wheel bearing device from the vehicle by using an appropriate IC tag reader. For this reason, it is possible to easily know information that the user wants to know about the wheel bearing device at the time of periodic inspection or other necessity. In particular, according to the present invention, in the wheel bearing device of the type in which the inner member is a separate member from the hub wheel and preload is applied by caulking, the IC tag is attached, so that the bearing is applied by caulking during assembly. It is possible to easily write the preload related information to the IC tag and read the preload related information from the IC tag as needed. Therefore, it is possible to improve the bearing life by managing the preload loss or the like in the periodic inspection or the like.

  In the present invention, the separate member is an outer ring that serves as a joint member with one of the constant velocity universal joints, and a hollow shaft-shaped stem portion of the outer ring is inserted into a central hole provided in the inner member, The diameter of the stem portion may be increased to perform caulking for coupling the hub wheel and the separate member.

  In the present invention, the separate member is an inner ring that fits into an inner ring fitting portion formed on an outer periphery of an inboard side end of the hub wheel, and a portion that protrudes more inward from the inner ring of the hub wheel. A caulking portion that is caulked to the outer diameter side may be caulked for coupling the hub wheel and the separate member.

When these separate members are an outer ring of a constant velocity universal joint or a bearing inner ring, the IC tag may store at least one of the bearing gap and the preload amount after the caulking.
By storing the bearing clearance and preload amount at the time of bearing assembly in the IC tag, it is possible to compare the measured value at the time of periodic inspection with the bearing clearance and preload amount at the time of bearing assembly, making preload management easy. Can be done. Further, in the inspection before shipping, etc., it is possible to compare and confirm the bearing gap and the preload amount at the time of bearing assembly.

In the present invention, a pair of seals for sealing both ends of the bearing space between the outer member and the inner member may be provided, and the IC tag may be attached to the seal on the inboard side among these seals. .
By attaching the IC tag to the seal on the inboard side, reading and writing to the IC tag can be easily performed. Further, when the IC tag is attached to the seal, the attachment can be performed more easily than the case where the IC tag is attached to the outer member or the inner member.

The seal on the inboard side may have a rubber or synthetic resin portion located on the end surface or outer diameter surface of the outer member, and the IC tag may be attached to this portion.
When a general IC tag is attached to a metal surface, it is necessary to take a radio wave absorption measure. However, by attaching the IC tag using a rubber or synthetic resin portion of the seal, it is not necessary to take a radio wave absorption measure. Can be reduced or reduced. Further, the IC tag can be attached in an embedded state when molding rubber or synthetic resin, thereby improving productivity.

In the present invention, when the separate member is an outer ring that becomes a joint member with one of the constant velocity universal joints, the composite sensor portion that is located between the raceway surfaces of the two rows on the outer member and projects into the bearing space The composite sensor unit includes a rotation sensor that detects an encoder provided on the outer periphery of the inner member, and a displacement sensor that detects a displacement in the axial direction with respect to the detected portion provided on the outer periphery of the inner member. And the memory or the IC tag may be incorporated in the composite sensor unit.
In the case of this configuration, the rotation sensor can detect the rotation of the wheel, and the displacement sensor can detect the load applied to the wheel. Using the displacement sensor, the axial gap between the displacement sensor and the detected portion before crimping another member to the hub wheel is stored in a memory or IC tag, and the displacement detected by the displacement sensor after crimping A reduction amount of the axial clearance can be obtained, and a preload amount applied to the bearing can be obtained from the reduction amount. Moreover, the bearing internal clearance of the final product can be obtained by adding the bearing internal clearance before caulking that has been stored in advance to the amount of decrease in the bearing internal clearance. Either or both of the obtained bearing internal clearance and preload amount can be written in the IC tag. When the memory is provided, an IC tag is provided somewhere in the wheel bearing device, and either or both of the bearing internal clearance and the preload amount are written in the IC tag.

In the case where the composite sensor is provided as described above, an L-shaped section-to-be-detected component having a cylindrical portion and a flange portion extending from one end of the cylindrical portion to the outer diameter side on the outer periphery of the inner member. The component to be detected may be attached by being press-fitted into the hub ring portion of the inner member such that the flange portion is positioned on the inboard side. In this case, a magnetic encoder serving as the encoder is provided on the outer periphery of the cylindrical portion of the detection target component.
The detected component part may be press-fitted into the outer ring of the constant velocity universal joint instead of being press-fitted into the hub ring.
Thus, when the L-shaped cross section component to be detected is provided, the bearing internal clearance can be easily detected by the displacement sensor.

In the present invention, a load sensor for detecting a load acting on the wheel bearing device may be provided, and sensitivity information of the load sensor may be stored in the IC tag.
In the case of this configuration, the sensitivity information of the load sensor stored in the IC tag is read out and written in the ECU (electric control unit) of the automobile, so that the sensitivity information can be used in the load detection process during traveling. In addition, since it is only necessary to read from the IC tag and write it to the ECU, it is possible to easily input sensitivity information to the ECU.

In this invention, when the separate member is the inner ring, the inner member may be one in which an outer ring serving as one joint member of a constant velocity universal joint is coupled. In this case, a load sensor that detects a load acting on the wheel bearing device is provided, and the load sensor detects a phase difference between the inner ring of the inner member and the outer ring of the constant velocity universal joint, A torque may be detected as the load. Information on the sensitivity of the load sensor may be stored in the IC tag.
When the inner member is a hub wheel fitted with an inner ring, the load acting on the wheel bearing device is determined as a torque value by detecting the phase difference between the outer ring of the constant velocity universal joint and the bearing inner ring. A load sensor to detect can be used. Also in the case of such a load sensor, the sensitivity information of the load sensor stored in the IC tag is read out and written in the ECU of the automobile, as described above, by recording the sensitivity information in the IC tag. Can be used for the load detection process.

  In the present invention, a composite sensor portion having a rotation sensor for detecting the rotation of the inner member relative to the outer member and a load sensor for detecting a load acting on the wheel bearing device is provided, and an IC tag is attached to the composite sensor portion. Information on sensitivity of the load sensor may be stored in the integrated IC tag.

  Since the wheel bearing device with an IC tag according to the present invention is a wheel bearing device to which a preload is applied by caulking, and a non-contact renewal type IC tag is attached, information on the bearing is recorded on the IC tag. It can be used for non-contact reading, inspection, etc. In particular, by recording the preload amount and the bearing gap in the IC tag, the preload management of the bearing can be easily and appropriately performed, and the bearing life can be improved.

A first embodiment of the present invention will be described with reference to FIGS. FIG. 1 shows a sectional view of a wheel bearing device with an IC tag according to this embodiment. This wheel bearing device is of a double row angular ball bearing type and is classified as a fourth generation type. In this specification, the side closer to the outer side in the vehicle width direction of the vehicle when attached to the vehicle is referred to as the outboard side, and the side closer to the center of the vehicle is referred to as the inboard side. In FIG. 1, the left side is the outboard side and the right side is the inboard side.
The wheel bearing device includes an outer member 1 having a double row raceway surface 1a on an inner periphery, an inner member 2 having a raceway surface 2a facing each of the raceway surfaces 1a, the outer member 1 and the inner member. It is comprised with the double-row rolling element 5 interposed between the track surfaces 1a and 2a of the direction member 2. FIG. The raceway surfaces 1a and 2a in each row have a circular arc shape in cross section, and are formed so that the contact angles are back to back. The rolling elements 5 in each row are formed of balls, and are held by a cage 6 for each row. Both ends of the annular space formed between the outer member 1 and the inner member 2 are sealed by contact seals 7 and 8, respectively.

The outer member 1 is a member on the fixed side, and has a vehicle body mounting flange 1b for fixing to a knuckle (not shown) on the outer periphery, and the whole is an integral member. The vehicle body mounting flange 1b is fastened to a knuckle installed in a vehicle body (not shown) with a plurality of bolts (not shown) in the circumferential direction.
The inner member 2 is a member on the rotation side, and includes a hub wheel 3 having a wheel mounting flange 3a at an end on the outboard side, and a constant velocity universal joint 13 which is a separate member coupled to the hub wheel 3. The outer ring 13a is one joint member. Of the double-row raceway surfaces 2a facing the raceway surface 1a of the outer member 1, each row of raceway surfaces 2a is provided on each of the hub wheel 3 and the constant velocity universal joint outer ring 13a. The constant velocity universal joint outer ring 13 a has a hollow shaft-shaped stem portion 14. The stem portion 14 is inserted into a central hole 9 provided in the hub wheel 3, and the diameter of the stem portion 14 is increased, whereby the hub wheel 3. And the constant velocity universal joint outer ring 13a for caulking. Moreover, the preload of the bearing is given by this caulking.

  The contact seal 7 on the inboard side includes a slinger 15 and a seal element 8A facing the slinger 15 as shown in an enlarged sectional view in FIG. The slinger 15 is a ring member having an L-shaped cross section composed of a cylindrical portion 15a and a standing plate portion 15b. The slinger 15 is fitted to the outer diameter surface of the inner member 2, specifically, the outer diameter surface of the constant velocity universal joint outer ring 13a. ing. The seal element 8 </ b> A includes a cored bar 16 and an elastic member 17 fixed to the cored bar 16. The metal core 16 includes a cylindrical portion 16 a and a standing plate portion 16 b, and is fitted to the inner diameter surface of the outer member 1 so as to face the slinger 15. The elastic member 17 is made of rubber or synthetic resin, and has three seal lips 17a to 17c positioned inside and outside the bearing space as a part thereof. The seal lips 17 a to 17 c are formed so that the tips thereof are in contact with the inner member 2 and the slinger 15.

The elastic member 17 is provided with an outer diameter extension portion 17d extending in the radial direction from the end portion of the cored bar cylindrical portion 15a and in contact with the end surface of the outer member 1, and the non-contact communication type IC is provided in the outer diameter extension portion 17d. A tag 10 is provided in an embedded state.
Note that the slinger 15 in the example of the figure is provided with a magnetic encoder 15c serving as a detected portion of the rotation sensor, and a magnetic field sensor (not shown) faces the magnetic encoder 15c and the outer member 1 is provided. Mounted on. The slinger 15 may not have the magnetic encoder 15c.

  In addition, the contact seal 8 on the inboard side may be configured as shown in FIG. This seal 8 is obtained by extending the cylindrical portion 16a of the cored bar 16 in FIG. 2 in the axial direction opposite to the case of FIG. 2 as shown in FIG. 3 and fitting it to the outer diameter surface of the outer member 1. is there. The IC tag 10 may be embedded in a portion 17e that covers the outer periphery of the cored bar cylindrical portion 16a of the elastic member 17 in the seal 8. In this case, the entire contact seal 8 is exposed from the annular space formed between the inner and outer members 2, 1, so that the elastic member 17 has an axial extension portion close to the tip of the slinger standing plate portion 15 b. 17 f is preferably formed to ensure the sealing performance of the contact seal 8.

  As shown in FIGS. 2 and 3, by attaching the IC tag 10 to the contact seal 8 on the inboard side, non-contact communication by radio waves or the like to the IC tag 10 can be easily performed.

  FIG. 4 schematically shows the IC tag 10 and the tag reader / writer 22. The IC tag 10 is capable of recording and reading information by communicating without contact, and includes an IC chip (integrated circuit chip) 20 and an antenna 21 as shown in FIG. Information is written to and read from the IC tag 10 by the tag reader / writer 22. The IC tag reader / writer 22 has an antenna 23 that faces the IC tag 10. In the case of writing information to the IC tag 10, the database 11 may be used via the terminal 12. The IC chip 20 and the antenna 21 of the IC tag 10 are integrally packaged with a resin (not shown), for example. There are various types, shapes and sizes of IC tags. In addition to strips and plates, for example, there are square and spherical ones having a size of less than 1 mm. There is also an IC tag that is formed directly on an object by printing or the like. Although there are various storage capacities, they may be appropriately selected according to the use and the size and type of the object to be attached.

  As the IC tag 10, for example, an RFID tag using RFID (Radio Frequency Identification) technology can be used. There are RFID-type IC tags that use electrostatic coupling, electromagnetic coupling, electromagnetic induction, microwave, light, or the like as a transmission method, and any of these types may be used. For example, an electromagnetic induction type or a microwave type is used.

  FIG. 5 shows a specific circuit example of the IC tag 10. The IC chip 20 of the IC tag 10 includes a central processing unit (CPU) 24, a memory 25, a transmission / reception circuit 26, and a power supply circuit 27. The power supply circuit 27 obtains power from the antenna 21. . As the memory 25, a memory that does not require a power source is used.

  According to the wheel bearing device having the above-described configuration, the preload amount applied to the bearing by caulking is applied to the IC tag 10 when the constant velocity universal joint outer ring 13a is coupled to the hub ring 3 of the inner member 2 at the time of incorporation. Can be written easily. Further, the preload information can be easily read from the IC tag 10 as necessary. In this embodiment, as shown in FIGS. 2 and 3, the IC tag 10 is embedded in the outer member end face and the portions 17 d and 17 e exposed on the outer diameter face side of the elastic member 17 of the contact seal 8 on the inboard side. Therefore, communication can be reliably performed in writing and reading of the information to and from the IC tag 10.

  In this embodiment, a load sensor (not shown) for detecting a load acting on the wheel bearing device may be provided separately, and sensitivity information of the load sensor may be stored in the IC tag 10. In this case, the sensitivity information of the load sensor stored in the IC tag 10 is read out and written in the ECU side of the automobile, so that the sensitivity information can be used in the load detection process during traveling.

  6 and 7 show another embodiment of the present invention. In the first embodiment shown in FIGS. 1 to 5, the wheel bearing device with an IC tag according to this embodiment is configured so that the outer member 1 has both rows of raceway surfaces 1 a as shown in FIG. A composite sensor portion 28 is provided so as to be located between and protrude into the bearing space. The composite sensor unit 28 incorporates the IC tag 10 or the memory 25A. When the memory 25A different from the IC tag 10 is incorporated in the composite sensor unit 28, the IC tag 10 is attached to the seal 8 as described with reference to FIGS. Attach the IC tag 10 somewhere.

  As shown in an enlarged view in FIG. 6B, the composite sensor unit 28 includes a rotation sensor 31 that detects an encoder 30 provided on the outer periphery of the inner member 2 and a cover provided on the outer periphery of the inner member 2. A displacement sensor 32 that detects displacement in the axial direction with respect to the detection unit 29b. The composite sensor unit 28 is configured by resin-molding the rotation sensor 31, the displacement sensor 32, and the IC tag 10 or the memory 25A together.

  On the outer periphery of the inner member 2, a detected component 29 is formed of an annular member having an L-shaped cross section having a cylindrical portion 29 a and a flange portion 29 b extending from one end of the cylindrical portion 29 a to the outer diameter side. The detected portion component 29 is attached by press-fitting the cylindrical portion 29a onto the outer periphery of the hub wheel 3 in the inner member 2 so that the flange portion 29b is positioned on the inboard side. The flange 29b of the detected component 29 is the detected portion of the displacement sensor 32. A magnetic encoder is provided as an encoder 30 which is a detected portion of the rotation sensor 31 on the outer periphery of the cylindrical portion 29a of the detected component 29, and the rotation sensor faces the encoder 30 in the radial direction. 31 is arranged. The magnetic encoder is composed of a multipolar magnet in which magnetic poles N and S are alternately arranged at a predetermined interval in the circumferential direction.

  The displacement sensor 32 is, for example, a reluctance type in which a coil is wound around a yoke, and detects a change in an axial gap with the flange portion (detected portion) 29b of the detected component 29. The rotation sensor 31 includes a magnetic sensor such as a Hall element or a magnetoresistive element, and detects a magnetic change of the encoder 30 that rotates integrally with the inner member 2.

  FIG. 7 is a block diagram showing a schematic circuit configuration when the IC tag 10 of the composite sensor section 28 is provided. The detection signal from the rotation sensor 31 and the detection signal from the displacement sensor 32 are converted into digital signals by the A / D converter 33 and input to the central processing unit (CPU) 24 of the IC tag 10. In this case, the IC tag 10 having an external input terminal is used, and the output of the A / D converter 33 is input to the external input terminal. Instead of providing the IC tag 10, an independent CPU 24A, memory 25A, and transmission / reception circuit 26A may be provided.

In the wheel bearing device of this embodiment, the axial clearance between the displacement sensor 32 and the flange portion (detected portion) 29b of the detected component 29 before the constant velocity universal joint outer ring 13a is crimped onto the hub wheel 3 ( Bearing internal clearance) is stored in the memory 25A or the IC tag 10, the amount of decrease in the bearing internal clearance is obtained from the displacement detected by the displacement sensor 32 after caulking, and the amount of preload applied to the bearing is obtained from this amount of reduction. . Further, a bearing internal clearance before caulking that has been stored in advance is added to the reduction amount of the bearing internal clearance to determine the bearing internal clearance of the final product. The obtained bearing internal clearance and preload amount are stored in the IC tag 10 of the composite sensor unit 28 or the IC tag 10 attached to another location.
The output of the displacement sensor 32 is input to a running posture control means (not shown) provided in the ECU of the automobile and used for controlling the running posture. In this case, by storing the sensitivity information of the displacement sensor 32 in the IC tag 10, the sensitivity information of the displacement sensor 32 is transferred to the ECU of the automobile, and the output of the displacement sensor 32 is corrected to an appropriate value. The attitude control and the like can be performed with high accuracy.

  In this embodiment, the case where the detected component 29 is press-fitted into the hub ring 3 of the inner member 2 is shown. However, the present invention is not limited to this, and a constant velocity that is a separate member of the inner member 2 is shown. You may press-fit in the universal joint outer ring | wheel 13a. Also in this case, the bearing internal clearance and the preload amount can be obtained from the displacement of the axial clearance between the displacement sensor 32 and the flange portion (detected portion) 29 b of the detected component 29 and stored in the IC tag 10.

  FIG. 8 shows still another embodiment of the present invention. This embodiment is an example applied to a third generation type wheel bearing device, and as shown in FIG. The inner ring 4 is a separate member fitted to the outer diameter surface of the end. A constant velocity universal joint outer ring 13 a is connected to the hub ring 3. The hub ring 3 of the inner member 2 is clamped and fixed in the axial direction with respect to the hub ring 3 by a caulking portion 3 b provided at an inboard side end of the hub ring 3. The constant velocity universal joint outer ring 13a is connected to the hub wheel 3 by screwing a bolt 43 through a washer 41 and a spacer 42 into a screw hole 14a provided in the center of the stem portion 14 of the constant velocity universal outer ring 13a. It is done by letting That is, the washer 41 is disposed so as to contact the step surface 9 a of the central hole 9 of the hub wheel 3, and the spacer 42 is disposed in the central hole 9 so as to be sandwiched between the washer 41 and the stem portion 14. The A bolt 43 inserted through the washer 41 and the spacer 42 is screwed into the screw hole 14a of the stem portion 14, so that the space between the caulking portion 3b of the hub wheel 3 and the step surface 13aa of the constant velocity universal joint outer ring 13a. An axial clearance is secured. Thus, when an axial load is applied to the bearing, the relative rotation between the inner member 2 and the constant velocity universal joint outer ring 13a is not hindered. The stem portion 14 of the constant velocity universal joint outer ring 13a is spline-fitted into the central hole 9 of the hub ring 3.

  In this embodiment, as shown in FIG. 8B, which is an enlarged view of a part of FIG. 8A, a load sensor 34 comprising a combination of a toothed ring 35 and a magnetic sensor 36 is provided. The toothed ring 35 is press-fitted into the outer diameter surface of the outer ring 13a of the constant velocity universal joint 13a and the first ring 37 press-fitted into the outer diameter surface of the inboard side end portion of the inner ring 3. It consists of a second ring 38 facing in the proximity of the direction. Both the rings 37 and 38 have the same outer diameter, and as shown in a plan view in FIG. 8C, a plurality of concave and convex portions 37a and 38a arranged at regular intervals in the circumferential direction are formed at their facing ends. Is formed. These concavo-convex portions 37a and 38a are set so that the phases are not in phase. The magnetic sensor 36 includes a first magnetic sensor 36A disposed in a position straddling both the rings 37, 38 so as to face both the rings 37, 38 in the radial direction, and the magnetic sensor 36A. It consists of the 2nd magnetic sensor 36B arrange | positioned facing a radial direction with respect to the part which remove | deviated from the uneven | corrugated | grooved part 38a of the 2nd ring 38 adjacent to an axial direction. Both magnetic sensors 36A and 36B are attached to the inner periphery of the outer member 1. These magnetic sensors 36A and 36B are of a reluctance type in which a coil is wound around a yoke.

  The contact seal 8 on the inboard side is obtained by omitting the slinger 15 in FIG. 3, and the seal lips 17a to 17c are brought into sliding contact with the step surface 13ab provided on the outer periphery of the constant velocity universal joint outer ring 13a. The inboard side seal is secured. An IC tag 10 is embedded in the side surface of the contact seal 8 facing the inboard side of the elastic member 17. The IC tag 10 stores a preload amount applied to the bearing by the caulking and information on sensitivity of the load sensor 34.

In this embodiment, when a load in the front-rear direction is applied to the wheel, the magnetic resistance is changed by changing the phase of both the concavo-convex portions 37a and 38a of the toothed ring 35. Therefore, the voltage corresponding to the change in the load is the first voltage. Obtained from the coil winding of the magnetic sensor 36A.
On the other hand, from the coil winding of the second magnetic sensor 36B facing the portion other than the concavo-convex portion 38a of the second ring 38 in the pulsang 35, a change in voltage corresponding to a change in load cannot be obtained. The output functions for temperature compensation. The load acting on the bearing can be obtained with high accuracy from the voltage difference between the two coil windings.
As described above, the sensitivity of the load sensor 34 stored in the IC tag 10 is transferred to the ECU of the automobile so that the output of the load sensor 34 in the ECU is corrected to an appropriate value, and a running posture control means (not shown). ) Can be accurately controlled.

  FIG. 9 shows still another embodiment of the present invention. In the embodiment shown in FIG. 8, the wheel bearing device with an IC tag of this embodiment includes a rotation sensor unit 45 and a load sensor unit 46 instead of the load sensor 36 including the toothed ring 35 and the magnetic sensor 36. A composite sensor unit 44 is configured. The rotation sensor unit 45 includes two rotation sensors 49A and 49B including a pair of magnetic encoders 47A and 47B and a pair of sensors 48A and 48B arranged to face the magnetic encoders 47A and 47B in the axial direction. . That is, the first rotation sensor 49A is configured by the magnetic encoder 47A attached to the outer periphery of the end of the inner member 2 and the sensor 48A attached to the end of the outer member 1 so as to face the magnetic encoder 47A. A magnetic encoder 47B attached to the outer periphery of the constant velocity universal joint outer ring 13a and a sensor 48B attached to the end of the outer member 1 so as to face the magnetic encoder 47B constitute a second rotation sensor 49B.

The magnetic encoder 47A, which is a component of the first rotation sensor 49A, is provided with a multipolar magnet on the surface facing the inboard side of the flange portion of an annular cored bar having an L-shaped cross section. The magnetic encoder 47A also serves as the contact seal 8 on the inboard side.
The sensor 48A, which is another component of the first rotation sensor 49A, is a magnetic sensor that detects the magnetic field of the magnetic encoder 47A, and is attached to the outer member 1 via the sensor attachment member 50. The sensor 48A is, for example, an annular type made of a magnetic yoke with a built-in coil, and is molded in the sensor mounting member 50. In the rotation sensor 49A configured as described above, when the magnetic encoder 47A rotates together with the inner member 2, a voltage having a frequency proportional to the rotation speed is induced in the coil of the sensor 48A by the relative rotation between the magnetic encoder 47A and the sensor 48A. This is output from the sensor 48A as a rotation signal.

The magnetic encoder 47B, which is a component of the second rotation sensor 49B, is provided with a multipolar magnet on the surface facing the outboard side of the flange portion of an annular cored bar having an L-shaped cross section. The magnetic encoder 47B is attached to the constant velocity universal joint outer ring 13a by press-fitting the cylindrical portion of the core metal into the outer periphery of the constant velocity universal joint outer ring 13a.
The sensor 48B, which is another component of the second rotation sensor 49B, is a magnetic sensor that detects the magnetic field of the magnetic encoder 47B, and is attached to the outer member 1 via the sensor attachment member 50. The sensor 48B is also of an annular type, and is molded in the sensor mounting member 50 so as to overlap with the other sensor 48A so as to be back-to-back in the axial direction.

  The load sensor section 46 includes a pair of displacement sensors 51 and a detected section 52. The pair of displacement sensors 51 is configured by winding a coil winding around a yoke, and is divided into upper and lower parts in the circumferential direction of the sensor mounting member 50. Be placed. The displacement sensor 51 is also molded into the sensor mounting member 50 and is a single sensor unit that can be handled together with the sensors 48A and 48B. The IC tag 10 is embedded in the sensor mounting member 50. The detected portion 52 of the displacement sensor portion 46 is formed by an extension portion of the cylindrical portion of the core metal of the magnetic encoder 47A of the first rotation sensor 49A.

In the wheel bearing device of this embodiment, the load in the front-rear direction acting on the wheel can be detected by the two rotation sensors 49A and 49B of the rotation sensor unit 45. That is, when a longitudinal torque acts on the wheel, relative rotation occurs between the inner member 2 and the constant velocity universal joint outer ring 13a, and the detection signal of the first rotation sensor 49A and the detection of the second rotation sensor 49B. A phase difference occurs between the signal and the signal. From this phase difference, the longitudinal load acting on the wheel can be detected. Since the detection signals of the two rotation sensors 49A and 49B are wheel rotation signals, one of them can be used as a rotation speed signal for ABS (anti-lock brake system).
Further, when a bending moment acts on the bearing from the wheel, the detected portion 52 consisting of the cylindrical portion extension portion of the core of the magnetic encoder 47A integrated with the inner member 2 is displaced. A pair of upper and lower displacement sensors 51 can be detected as a bending moment.

It is sectional drawing of the bearing apparatus for wheels with an IC tag concerning 1st Embodiment of this invention. It is a partial expanded sectional view of the contact seal of the inboard side in the bearing apparatus for wheels. It is a partial expanded sectional view which shows the other structural example of the contact seal by the side of the inboard in the bearing apparatus for wheels. It is a block diagram which shows the relationship between the IC tag used for the bearing apparatus for wheels, and a tag reader / writer. It is a circuit block diagram which shows schematic structure of an IC tag. (A) is sectional drawing of the wheel bearing apparatus with an IC tag concerning other embodiment of this invention, (B) is the elements on larger scale of the bearing apparatus for wheels. It is a circuit block diagram which shows the circuit structure of the composite sensor part in the bearing apparatus for wheels. (A) is sectional drawing of the bearing apparatus for wheels with an IC tag concerning other embodiment of this invention, (B) is the elements on larger scale of the bearing apparatus for wheels, (C) is in the bearing apparatus for wheels. It is a partial enlarged plan view of a toothed ring. It is sectional drawing of the bearing apparatus for wheels with an IC tag concerning other embodiment of this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 ... Outer member 1a ... Raceway surface 2 ... Inner member 2a ... Raceway surface 3 ... Hub wheel 3a ... Wheel mounting flange 5 ... Rolling element 9 ... Center hole 10 ... IC tag 13 ... Constant velocity universal joint 13a ... Constant velocity universal Joint outer ring 14 ... stem 28 ... composite sensor 29 ... detected part component 29a ... cylindrical part 29b ... flange (detected)
DESCRIPTION OF SYMBOLS 30 ... Encoder 31 ... Rotation sensor 32 ... Displacement sensor 34 ... Load sensor 44 ... Load sensor part 45 ... Rotation sensor part 46 ... Load sensor part

Claims (12)

  An outer member having a double-row raceway surface on the inner periphery, an inner member having a raceway surface facing the raceway surface on the outer periphery, and a double-row rolling element interposed between the two raceway surfaces; The inner member is a hub wheel having a wheel mounting flange and another member coupled to the hub wheel, and the raceway surface of each row is formed on the hub wheel and the separate member, In a wheel bearing device in which another member is coupled to the hub wheel by caulking and bearing preload is applied by caulking, an IC tag capable of non-contact communication is attached to the wheel bearing device. A wheel bearing device with an IC tag as a feature.   In Claim 1, the another member is an outer ring that becomes a joint member with one of the constant velocity universal joints, and a hollow shaft-shaped stem portion of the outer ring is inserted into a central hole provided in the inner member, A bearing device for a wheel with an IC tag, which is obtained by caulking the hub wheel and the separate member by expanding the diameter of the stem portion.   In Claim 1, The said another member is an inner ring | wheel fitted to the inner ring | wheel fitting part formed in the outer periphery of the inboard side end of the said hub ring | wheel, and protruded inboard side rather than the said inner ring | wheel of the said hub ring | wheel. A wheel bearing device with an IC tag, wherein a caulking portion is caulked to the outer diameter side for caulking for coupling the hub wheel and the separate member.   4. The wheel bearing device with an IC tag according to claim 1, wherein at least one of a bearing gap and a preload amount after the caulking is stored in the IC tag. 5.   In any 1 item | term of Claim 1 thru | or 4, A pair of seal | sticker which each seals the both ends of the bearing space between the said outer member and the said inner member is provided, Of these seals, an inboard side is provided. A wheel bearing device with an IC tag, wherein the IC tag is attached to a seal.   6. The wheel bearing with an IC tag according to claim 5, wherein the seal on the inboard side has a rubber or synthetic resin portion located on an end surface or an outer diameter surface of the outer member, and the IC tag is attached to this portion. apparatus.   In Claim 2, the outer member is provided with a composite sensor portion located between the raceway surfaces of both rows and projecting into the bearing space, and the composite sensor portion includes an encoder provided on the outer periphery of the inner member. With a rotation sensor for detecting and a displacement sensor for detecting a displacement in the axial direction with respect to the detected portion provided on the outer periphery of the inner member, with an IC tag incorporating the memory or the IC tag in the composite sensor portion Wheel bearing device.   8. The detected portion configuration component according to claim 7, wherein an L-shaped cross section having a cylindrical portion and a flange portion extending from one end of the cylindrical portion to the outer diameter side is provided on the outer periphery of the inner member. The component is press-fitted and attached to the hub ring portion of the inner member so that the flange portion is located on the inboard side, and the magnetic component that becomes the encoder on the outer periphery of the cylindrical portion of the component to be detected A wheel bearing device with an IC tag provided with an encoder.   9. The wheel bearing device with an IC tag according to claim 8, wherein the detected component part is press-fitted into an outer ring of a constant velocity universal joint instead of being press-fitted into a hub ring.   7. A wheel with an IC tag according to claim 1, wherein a load sensor for detecting a load acting on the wheel bearing device is provided, and sensitivity information of the load sensor is stored in the IC tag. Bearing device.   4. The inner member according to claim 3, wherein an outer ring serving as one joint member of a constant velocity universal joint is coupled, and a load sensor for detecting a load acting on the wheel bearing device is provided. The sensor detects a torque as the load by detecting a phase difference between the inner ring of the inner member and the outer ring of the constant velocity universal joint. Information on the sensitivity of the load sensor is stored in the IC tag. Bearing device for wheel with IC tag stored.   The composite sensor unit according to claim 1, further comprising: a rotation sensor that detects rotation of the inner member relative to the outer member; and a load sensor that detects a load acting on the wheel bearing device. An IC tag-equipped wheel bearing device provided with an IC tag incorporated in the composite sensor portion, and information on sensitivity of the load sensor stored in the incorporated IC tag.

Images