JP5052178B2 - Wheel bearing with bidirectional communication function - Google Patents

Description

  The present invention relates to a wheel bearing with a bidirectional communication function having a bidirectional communication function for exchanging signals and electric power between a rotating wheel and a fixed wheel in a non-contact manner.

  2. Description of the Related Art In recent years, in order to improve the stability of automobiles, tire abnormality detection devices that detect an abnormality when a tire occurs and issue a warning to a driver as necessary have been actively developed. For example, a tire air pressure monitoring device (Patent Document 1) that monitors tire air pressure, a tire abnormality detecting device that detects tire abnormality based on tire temperature and wear amount, and the like can be cited. Moreover, a structure in which a load sensor is provided on the rotation side has also been proposed as means for detecting the tire contact force (Patent Document 3). As described above, when the sensor is installed on the rotation side, it is necessary to supply power for driving the sensor and the transmitter to the rotation side.

In order to meet such a demand, there has been proposed one having a power generation plate that generates power by generating a shape deformation due to air pressure fluctuation in the tire (for example, Patent Document 1). In addition, a tire power supply device has been proposed in which an electromagnetic coil is provided on the rotating side of the tire and a magnetic field generating means is provided on the non-rotating side (for example, Patent Document 2). Further, a wheel bearing device in which a power generation device is incorporated in a wheel bearing has been proposed (Patent Document 4). Further, a bearing with a non-contact signal transmission mechanism in which a non-contact signal transmission mechanism is provided on the bearing has been proposed (for example, Patent Document 5). In addition, there is a means for supplying power to the rotating side by a method such as slip ring or wireless power feeding.
JP 2006-329772 A JP 2006-232195 A JP 2003-246201 A JP 2002-055113 A JP 2002-130262 A

Patent Literature 1 discloses a tire power supply device that generates power using a power generation plate that deforms due to a change in tire air pressure, Patent Literature 2 discloses an electromagnetic coil on the rotating side, and a magnetic field generating means on the non-rotating side. In any case where a power generator is incorporated in a wheel bearing, power can only be supplied to the rotating side. For this reason, it is necessary to provide a means for transmitting the sensor output separately by light, wireless, or the like, which increases the number of parts and reduces the degree of freedom in design.
In Patent Document 4, power is generated by the wheel bearing, but it is not used as power supply or communication means to the rotating side.
In addition, all of the configurations of Patent Documents 1 to 4 can supply power only during rotation. In the configuration of Patent Document 5, since no connector is mounted, wiring on the rotation side is difficult. In addition, when the slip ring is used, friction and wiring are problematic.

  The object of the present invention is to enable bidirectional communication between the rotating side and the stationary side, reducing the number of parts and improving the degree of design freedom, and performing communication regardless of whether the rotation is stopped or stopped, and wiring is also possible. An object of the present invention is to provide a wheel bearing with a bidirectional communication function that is easy and does not have a problem of increased friction for communication.

The wheel bearing with bidirectional communication function according to the present invention includes a fixed wheel having a double-row rolling surface, a rotating wheel having a rolling surface facing the rolling surface of the fixed wheel, and an opposing rolling wheel. In a wheel bearing comprising a double row rolling element interposed between running surfaces, and rotatably supporting the wheel with respect to the vehicle body,
Bidirectional communication means for bidirectionally communicating in a non-contact manner is provided between the fixed wheel and the rotating wheel, and one or both of the fixed wheel and the rotating wheel are connected to the bidirectional communication means. It has a connector. The connector provided on the fixed wheel or the rotating wheel is, for example, a plug-and-connect type, and is one of a pair of connectors that are plugged and connected to each other, and can be either a plug type or a socket type. good. The other connector in the connector pair is provided on the wiring side connected to the connector provided on the fixed ring or the rotating ring.

According to this configuration, since the bidirectional communication means for performing bidirectional communication between the fixed wheel and the rotating wheel is provided, the signal of the sensor attached to the rotating side of, for example, a tire is transmitted to the fixed side via the bidirectional communication means. Therefore, it is not necessary to provide means for wirelessly transmitting the sensor signal. Even if there are a large number of sensors, it is possible to send data to the bus collectively by a relay device, so that only the necessary number of sensors can be connected with a small number of wires. In this case, for example, communication data may be exchanged by using an interface based on a serial communication protocol such as a CAN (Controller Area Network) bus. Further, by using the bidirectional communication means, it is possible to easily supply power from the fixed side to the rotating side. Unlike the generator, the bidirectional communication means can supply electric power without rotating. Therefore, a wireless power feeding function, a battery, a single power generation function, and the like necessary for a sensor attached to a tire or the like can be eliminated. Further, since the connector is provided on at least one of the fixed wheel and the rotating wheel, wiring on the wheel bearing and the vehicle body side or wiring on the wheel bearing and the tire or wheel side is facilitated. Wiring can be performed even after the wheel bearing is incorporated into the vehicle body or wheel, so that assembly is facilitated. Since the bidirectional communication means performs non-contact communication, there is no problem of increased friction.
In this way, communication can be performed in both directions between the rotating side and the fixed side, reducing the number of parts and improving the degree of freedom of design. In addition, communication can be performed during rotation and when rotation is stopped, and wiring is easy. Also, the problem of increased friction for communication does not occur.

  In this invention, the bidirectional communication means includes a primary coil wound around a core provided on the fixed wheel and a secondary coil wound around a core provided on the rotating wheel, and the primary coil A magnetic circuit may be constituted by the coil and the secondary coil. A so-called rotary transformer is used. Thereby, it becomes a structure suitable for the wheel bearing which has the rotation side wheel which is a rotary body.

  As described above, when the primary coil and the secondary coil are used, the bidirectional communication unit may perform data communication and power transmission at different frequencies. For example, power transmission is performed on the low frequency side, and data transmission is performed on the high frequency side. Thereby, communication of data and electric power can be performed using a common primary coil and secondary coil.

  When data communication and power transmission are performed at different frequencies as described above, the primary coil and secondary coil cores are divided into a low frequency core and a high frequency core. May be provided. In this way, the efficiency of transmission can be increased by dividing the core according to the frequency.

  In the present invention, confirmation means for confirming whether communication by the bidirectional communication means is normally established may be provided. When a function for recognizing whether or not communication is normally established is provided, the reliability of the apparatus is improved.

  The magnetic circuit in the bidirectional communication means may include one or both of a part of the fixed wheel and a part of the rotating wheel. If the magnetic circuit is configured to include a part of the fixed ring or a part of the rotating wheel, the magnetic circuit can be easily configured, and the shapes of the rotor core and the stator core can be simplified.

  The connector may be fixed to the rotating wheel or the fixed wheel. If the connector is fixed to the rotating wheel or the fixed wheel, the wiring does not get in the way when the wheel is assembled, and wiring to the tire side or the vehicle body side can be easily performed.

A connector for connecting wires to the tire and the wheel side, Keru set to a flange formed in the inner diameter portion or the rotating wheel of the rotating wheel. This facilitates communication with tires and wheels. In addition, since the connector is disposed on the inner diameter portion or the flange of the rotating wheel, the connector does not interfere with peripheral components and wiring is easy.

Either one or both of the fixed ring and the rotating ring may be provided with a wiring hole or a wiring groove for leading the wiring to the outside of the bearing from the peripheral surfaces of the fixed ring and the rotating ring facing each other. Providing such wiring holes or wiring grooves facilitates drawing the wiring to the outside, and prevents the wiring from being disconnected when a constant velocity joint is assembled to the wheel bearing.
A part of the wiring hole or the wiring groove may be molded. By molding a part of the wiring hole or the wiring groove, foreign matter such as water can be prevented from entering the inside.

  In this invention, you may provide the control circuit which stabilizes the electric power to transmit to either one or both of the said fixed wheel and the said rotating wheel. This control circuit is, for example, a circuit including a rectifier circuit, a regulator, an inverter, and the like. By providing such a control circuit, stable power can be supplied.

  In this invention, the bidirectional communication means has means for generating AC voltage for transmitting electric power from the fixed wheel side to the rotating wheel side, and fixed bidirectional communication auxiliary means, and the bidirectional communication means has rotating wheels. Rotation-side bidirectional communication auxiliary means having means for generating a carrier wave for transmitting data from the side to the fixed wheel side and superimposing a signal on the carrier wave may be provided. By providing such bi-directional communication auxiliary means, bi-directional communication using the bi-directional communication means composed of the primary coil and the secondary coil is realized.

Note that one or both of the primary coil and the secondary coil may have a partition wall for protecting the coil. By providing the partition wall in this way, the coil can be protected. In addition, in a situation where there is grease around the bidirectional communication means, it is possible to prevent deterioration of the insulating coating of the coil due to the grease.
Moreover, the said connector is good also as what has waterproofness in the insertion connection state with the connector connected with respect to this connector. If waterproofing is provided in this way, it can be used even under conditions in which the environment is exposed to salt mud.

The wheel bearing with bidirectional communication function according to the present invention includes a fixed wheel having a double-row rolling surface, a rotating wheel having a rolling surface facing the rolling surface of the fixed wheel, and an opposing rolling wheel. In a wheel bearing having a double row rolling element interposed between running surfaces and rotatably supporting a wheel with respect to a vehicle body, non-contact communication is performed in a non-contact manner between the fixed wheel and the rotating wheel. Since a bidirectional communication means is provided, and either one or both of the fixed wheel and the rotating wheel has a connector connected to the bidirectional communication means, bidirectional communication between the rotating side and the fixed side can be performed. In addition, the number of parts can be reduced, the degree of freedom in design can be improved, communication can be performed regardless of rotation and when rotation is stopped, wiring is easy, and there is an effect that there is no problem of increased friction for communication . Further, a connector for connecting the wiring to the tire or wheel side is provided on the inner diameter portion of the rotating wheel or a flange provided on the rotating wheel. This facilitates communication with tires and wheels. In addition, since the connector is disposed on the inner diameter portion or the flange of the rotating wheel, the connector does not interfere with peripheral components and wiring is easy.

An embodiment of the present invention will be described with reference to FIGS. 1 is a cross-sectional view taken along the line I-O-I 'of FIG. This embodiment is a third generation inner ring rotating type and is applied to a wheel bearing for driving wheel support. 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.
As shown in a cross-sectional view in FIG. 1, the bearing for the wheel bearing with bidirectional communication function is opposed to the outer member 1 in which a double row rolling surface 3 is formed on the inner periphery, and the respective rolling surfaces 3. The inner member 2 in which the rolling surface 4 to be formed is formed, and the outer member 1 and the double row rolling elements 5 interposed between the rolling surfaces 3 and 4 of the inner member 2. This wheel bearing is a double-row angular ball bearing type, and the rolling elements 5 are made of balls and are held by a cage 6 for each row. The rolling surfaces 3 and 4 have a circular arc shape in cross section, and the rolling surfaces 3 and 4 are formed so that the contact angles are aligned with the back surface. Both ends of the bearing space between the outer member 1 and the inner member 2 are respectively sealed by seals 7 and 8 serving as sealing devices.

The outer member 1 is a fixed wheel, and has a flange 1a for mounting a vehicle body attached to a knuckle in a suspension device (not shown) of the vehicle body on the outer periphery, and the whole is an integral part. Bolt holes 14 for mounting the vehicle body are provided in the flange 1a at a plurality of locations in the circumferential direction.
The inner member 2 is a rotating wheel, and includes a hub wheel 9 having a hub flange 9a for wheel mounting, and an inner ring 10 fitted to the outer periphery of the end portion of the shaft portion 9b of the hub wheel 9 on the inboard side. The hub wheel 9 and the inner ring 10 are formed with the rolling surfaces 4 of the respective rows. An inner ring fitting surface 12 having a small diameter with a step is provided on the outer periphery of the inboard side end of the hub wheel 9, and the inner ring 10 is fitted to the inner ring fitting surface 12. A through hole 11 is provided at the center of the hub wheel 9. The hub flange 9a is provided with press-fit holes 16 for hub bolts at a plurality of locations in the circumferential direction. In the vicinity of the base portion of the hub flange 9a of the hub wheel 9, a cylindrical pilot portion 13 for guiding a wheel and a braking component (not shown) protrudes toward the outboard side.

  The wheel bearing is provided with bidirectional communication means 21 that transmits electric power in a non-contact manner between the outer member 1 that is a fixed wheel and the inner member 2 that is a rotating wheel. The bidirectional communication means 21 is disposed between the double row rolling surfaces 3 and 3 (4, 4).

  The bidirectional communication means 21 includes a primary coil 22, a stator core 23, a secondary coil 24, a rotor core 25, and wirings 26 and 27. The primary coil 22 and the secondary coil 24 are provided so as to constitute one magnetic circuit. The stator core 23 is made of a ring-shaped member having a groove on the inner diameter surface, and a primary coil 22 is wound in the groove. The rotor core 25 is made of a ring-shaped member having a groove on the outer diameter surface, and a secondary coil 24 is wound in the groove. A part of the stator core 23 and the rotor core 25 is provided with a wiring hole (not shown) for passing wiring. The stator core 23 and the primary coil 22 are in the radial direction on the inner diameter surface of the outer member 1 that is a fixed ring, and the rotor core 25 and the secondary coil 24 are on the outer diameter surface of the inner member 2 that is a rotating wheel. It is installed so as to face. The stator core 23 and the rotor core 25 are fixed to the outer member 1 and the inner member 2 by a method such as press fitting or adhesion. In order to position the stator core 23 and the rotor core 25 in the axial direction, a step, a projection (not shown), or the like may be provided on the inner diameter surface of the outer member 1 or the outer diameter surface of the inner member 2.

  The outer member 1 that is a fixed ring is provided with a wiring hole 28 through which the wiring 26 connected to the primary coil 22 passes from the inner diameter surface to the outer diameter surface. The hub wheel 9 of the inner member 2 that is a rotating wheel is provided with a wiring hole 29 through which the wiring 27 connected to the secondary coil 24 passes from the outer diameter surface to the inner diameter surface. A wiring groove 30 is provided in a part of the wiring groove 27 so as to extend the wiring 27 in the axial direction. When assembling the primary coil 22 and the stator core 23, the wire 26 may be fitted to the inner diameter surface of the outer member 1 from the axial direction in a state where the wire 26 is passed through in advance.

  Connectors 31 and 32 for connecting the wirings 26 and 27 to the vehicle body side and the tire or wheel side are provided at the ends of the wirings 26 and 27, respectively. The connector 32 connected to the tire or wheel side is fixed to the end face on the outboard side of the hub wheel 9 in the inner member 2 at an inner diameter portion than the pilot portion 13. The connector 31 for connecting to the vehicle body side is provided in a state where it is not fixed to the outer diameter surface of the outer member 1.

  The connectors 31 and 32 are connected to the power lines 26 and 27 when the power is supplied from the fixed side to the rotating side, and the signal lines are connected when the output signal of the sensor or the like is transmitted from the rotating side to the fixed side. Yes. Both the power line and the signal line may be connected.

The connectors 31 and 32 are one of plug-in connector pairs in which a pair of connectors are inserted and connected to each other, and may be either a plug type or a socket type. The connectors 31 and 32 may be multipolar or coaxial.
FIG. 3 is a schematic view showing an example of the connector 32 fixed to the hub wheel 9 and the connector 33 of the tire-side wiring 34 connected to the connector 32.

  The fixed-side connector 31 and the rotary-side connector 32 are connected to the connectors 31 and 32 through the connectors 35 and 33 and their wirings 37 and 34. 38, 39. Via these two-way communication auxiliary means 38 and 39, it is connected to a power source, a sensor and the like.

The bidirectional communication auxiliary means 38, 39 is an electric circuit or the like for performing bidirectional communication by causing the bidirectional communication means 21 to function, for example, means for generating an alternating voltage for transmitting electric power, or transmitting data. Processing such as generation of a carrier wave to be performed and superimposition of a signal on the carrier wave are performed.
For example, an example in which power is transmitted from the fixed side to the rotating side and sensor data is transmitted from the rotating side will be described. In this case, the fixed-side bidirectional communication assisting means 38 includes an alternating current generating function unit that converts a direct current of a power source (not shown) into an alternating current having a frequency for transmission via the bidirectional communication means 21. , And a demodulating means for extracting a signal component from the received current. The bidirectional communication means 39 on the rotation side superimposes the output signal of the sensor (not shown) on the carrier wave, the rectifying means for converting the received alternating current into the direct current to be used as the power source of the sensor (not shown). Modulation means to be used.
In this example, the two-way communication auxiliary means 38 and 39 perform data communication and power transmission at different frequencies. In this case, power is performed on the low frequency side and data is performed on the high frequency side.

In addition, when a large number of sensors are provided on the rotation side, a relay device is provided in the bidirectional communication auxiliary means 39 on the rotation side, and this relay device receives an interface for receiving communication data such as a plurality of sensor outputs by serial communication Is provided. As this interface, for example, a serial communication protocol such as CAN is used. The fixed-side bidirectional communication auxiliary means 38 is provided with means for extracting signals transmitted by serial communication as outputs of individual sensors.
The fixed-side bidirectional communication auxiliary means 38 may be provided independently, or may be incorporated in an electric control unit (ECU) of an automobile. Further, the two-way communication auxiliary means 39 on the rotation side may be provided independently or may be assembled as a part integrated with the sensor.

  Further, a confirmation means 49 for confirming whether or not the communication by the bidirectional communication means 21 is normally established may be provided. The confirmation means 49 may be provided, for example, in the fixed-side bidirectional communication auxiliary means 38, or may be provided in the fixed-side connector 31 or between the connector 31 and the primary coil 22.

  According to the wheel bearing with a bidirectional communication function configured as described above, since the bidirectional communication means 21 is provided, for example, power is supplied from the outer member 1 side that is a fixed wheel to the inner member 2 side that is a rotating wheel. When an AC voltage is applied to the primary coil 22, the magnetic flux generated in the cores 23 and 25 is transmitted to the secondary coil 24 as inductive power. Therefore, power can be supplied without contact. In this case, unlike the generator, the bidirectional communication means 21 can supply electric power without rotating. Therefore, a wireless power feeding function, a battery, a single power generation function, and the like necessary for a sensor attached to a tire or the like can be eliminated.

  Further, the bidirectional communication means 21 transmits the signal of a sensor (not shown) attached to the rotation side of, for example, a tire to the fixed side via the bidirectional communication means 21, so that the sensor signal is transmitted wirelessly. It is not necessary to provide a means for transmitting. Even if there are a large number of sensors, it is possible to send data to the bus by using a repeater as described above, so that the required number of sensors can be connected with a small number of wires. In that case, the communication data may be exchanged by using an interface based on a serial communication protocol such as a CAN bus as described above.

  Further, by connecting to the tire or wheel via the connector 32, the wiring does not get in the way when the wheel bearing is installed on the wheel, and the wiring in the tire can be performed even before the wheel bearing is installed. It becomes possible. As the connectors 31 and 32, it is preferable to use a connector that is waterproof in a plugged connection state that is in a fitted state. By doing so, it can be used even under poor conditions such as undercarriage of automobiles. The wiring 27 on the hub wheel 9 side is preferably fixed in the wiring groove 30. Then, when the constant velocity joint is assembled, the wiring 27 does not get in the way and can be assembled without being disconnected. If parts of the wiring holes 28 and 29 and the wiring groove 30 are molded with a molding resin (not shown) or the like, water or the like can be prevented from entering the bearing. The primary coil 22 and the secondary coil 24 may be covered with a cover (not shown) made of resin or the like that serves as a protective partition, thereby protecting the coils 22 and 24.

  In this embodiment, a rotary transformer structure composed of a primary coil 22 and a secondary coil 24 is shown as the bidirectional communication means 21, but the bidirectional communication means 21 is non-contact data communication and power supply. In addition, the power may be transmitted using infrared rays, light, radio waves, ultrasonic waves, capacitive coupling, magnetic coupling, or the like. However, in the case of a rotating body such as a wheel bearing, a rotary transformer structure like this embodiment is considered suitable.

FIG. 4 shows another embodiment of the present invention. In this embodiment, the primary coil 22 and the secondary coil 24 in the bidirectional communication means 21 are installed so as to face each other in the axial direction. Stator core 23A and rotor core 25A are ring-shaped members having an L-shaped cross section, and primary coil 22 and secondary coil 24 are wound therein.
A magnetic path, that is, a magnetic circuit when an alternating voltage is applied to the primary coil 22 or the secondary coil 24 includes a part of the hub wheel 9 constituting the rotating wheel. If the magnetic circuit is configured to include a part of the hub wheel 9 in this way, the magnetic circuit can be easily configured, and the shapes of the rotor core 25A and the stator core 23A can be simplified. Other configurations and effects are the same as those of the embodiment of FIG.

  FIG. 5 shows still another embodiment of the present invention. In this embodiment, the two-way communication means 21 is disposed between the proximal end of the hub flange 9a of the hub 9 constituting the rotating wheel and the inner diameter surface of the outer board 1 end of the outer member 1 serving as a fixed ring. ing. The primary coil 22 and the secondary coil 24 are arranged so as to face each other in the axial direction. A sealing device 7B is provided between the hub flange 9a of the rotating wheel and the end face of the outer member 1 on the outboard side. A part of the hub flange 9a in the circumferential direction is provided with a wiring groove 36 that extends the wiring 27 of the secondary coil, and the connector 32 connected to the wiring 27 is exposed to the outside from the outer diameter surface of the hub flange 9a. I'm out. The portion of the wiring 27 that protrudes from the hub flange 9a is preferably provided with a wiring hole 41 in a part of the brake rotor 40 and pulled out to the outer diameter side. Other configurations are the same as those of the embodiment described above with reference to FIG.

FIG. 6 shows still another embodiment of the present invention. In this embodiment, control circuits 53 and 54 are installed on the hub wheel 9 of the inner member 2 constituting the rotating wheel and the outer member 1 which is a fixed wheel, respectively. The control circuits 53 and 54 are formed by mounting circuit elements on a circuit board or a circuit chip, and are fixed to the side surface of the hub flange 9 a of the hub wheel 9 and the outer diameter surface of the outer member 1. These control circuits 53 and 54 stabilize the transmitted power and include a rectifier circuit, a regulator, an inverter, and the like. For example, an inverter is provided in the control circuit 54 on the outer member 1 side which is a fixed wheel, and a rectifier circuit and a regulator are provided on the hub wheel 9 side constituting the rotating wheel. Thereby, the DC voltage from the vehicle body side is converted into an AC voltage, and the AC voltage is applied to the primary coil 22. When an AC voltage is applied to the primary coil 22, it is transmitted as inductive power to the secondary coil 24. Therefore, the AC voltage generated in the secondary coil 24 is converted into a DC voltage by a rectifier circuit, and smoothed and made constant by a regulator. Can output stable power to sensors installed on tires and wheels. The guide groove 36 of the wiring 27 provided in the hub flange 9 a extends from the inner diameter portion of the hub flange to the mounting position of the control circuit 53. Other configurations in this embodiment are the same as those in the embodiment shown in FIG.
The control circuits 53 and 54 may be provided with the functions of the rotation-side bidirectional communication auxiliary means 39 and the fixed-side bidirectional communication auxiliary means 38 described above with reference to FIG.

FIG. 7 shows still another embodiment of the present invention. This two-way communication function equipped wheel support bearing, two-way communication means 21, a primary coil 22a and the receiving primary coil 22b for transmission provided on the stator core 23, receiving credit secondary coil provided in the rotor core 25 consisting of a 24a and send credit secondary coil 24b.
The stator core 23 is a ring-shaped member having two grooves on the inner periphery, and a primary coil for transmission 22a and a primary coil for reception 22b are accommodated in each groove, and the primary for transmission and reception are contained therein. The coils 22a and 22b are common. The rotor core 25 is a ring-shaped member has two grooves in the outer periphery, received credit secondary coil 24a and fed credit secondary coil 24b in each groove is accommodated, the primary coil of receiving credit and transmission credit 24a and 24b are common.

The stator core 23 is attached to the inner peripheral surface of the outer member 1 that is a fixed wheel, and the rotor core 25 is attached to the outer peripheral surface of the hub wheel 9 constituting the rotating wheel. A magnetic circuit and the receiving secondary coil 24a of the transmitting primary coil 22a and the rotor core 25 of the stator core 23 to face each other and feed credit secondary coil of the receiving primary coil 22b and the rotor core 25 of the stator core 23 24b face each other to constitute a magnetic circuit.

Wiring 26 of the fixed side having a power line and data lines, power lines are connected to the transmitting primary coil 22a, the data line is connected to the receiving 1 Tsugiko yl 2 2b. Line 27 of the rotating side includes a power supply line and signal line, the power line is connected to the receiving secondary coil 24a, signal line is connected to the reception 2 Tsugiko yl 2 4b.

  In this embodiment, electric power is transmitted between the primary coil 22a and the secondary coil 24a, and data is transmitted between the primary coil 22b and the secondary coil 24b. Other configurations in this embodiment are the same as those in the first embodiment.

FIG. 8 shows still another embodiment of the present invention. In this embodiment, the bidirectional communication means 21 includes first and second bidirectional communication means sections 211 and 212. The first bidirectional communication unit 21 1 is the same as the bidirectional communication unit 21 described above with reference to FIG.
Second bidirectional communication hand stepped portion 2 12 a primary coil 22 and secondary coil 24, is positioned on the outer periphery of the outer member 1 is a fixed ring, and is opposed to each other in the axial direction. The stator core 23B is fixed to the outer diameter surface of the outer member 1, and the rotor core 25B is fixed to the side surface of the hub flange 9a. The stator core 23B and the rotor core 25B are ring-shaped with grooves on the side surfaces, and the primary coil 22 and the secondary coil 24 are accommodated in the grooves, respectively. The primary coil 22 is connected to a connector 31 ′ attached to the stator core 23B by wiring (not shown). The secondary coil 24 is connected to the connector 32 'via a wiring 27'. The wiring 27 'is inserted into a wiring hole 42 provided in the hub flange 9a, and the connector 32' is fixed to the side surface of the hub flange 9a. Note that a relief groove (not shown) into which the connector 32 ′ enters is formed in the wheel and the brake rotor that are attached to the hub flange 9 a in an overlapping manner. A sensor (not shown) or the like is connected to the connector 32 'via the connector.

As described above, when the two-way bidirectional communication means 21 1, 21 2 is provided as the bidirectional communication means 21, the two-way communication means 21 1 according to various sensors provided on the rotating side of the wheel or the like. , 212 may be used properly. Further, either one, for example, the second bidirectional communication means 21 2 may be used for power transmission, and the other first bidirectional communication means 211 may be used for data transmission and reception. In this case, the frequency may be different between power transmission and data communication so that power is transmitted on the low frequency side and data is transmitted on the high frequency side. Further, in the example of FIG. 8, the first bidirectional communication means 21 1 is replaced with one primary coil 22 shown in the first embodiment of FIG. The secondary coil 24 may be included. As described above, the bidirectional communication means 21 is provided with the two-way bidirectional communication means portions 211 and 212, or within one system for low frequency for power transmission and low frequency for data communication. When divided into use, efficient transmission can be performed.
As the bidirectional communication means 21, only the second bidirectional communication means portion 21 2 in the example of FIG. 8 may be provided.

In each of the above embodiments, the two-way communication means 21 is disposed between the double row rolling surfaces 3 and 3 or at the outboard side end of the wheel bearing device. Bi-directional communication means 21 may be provided to supply power and transmit output signals to the sensor installed at the constant velocity joint. In that case, the primary coil 22 may be provided on the inboard side end surface of the outer member 1 serving as a fixed ring, and the secondary coil 24 may be provided on the inner ring 10.
In each of the above embodiments, the outer member 1 is a fixed side wheel, but the present invention can also be applied to a wheel bearing device in which the inner member is a fixed side wheel and the outer member is a rotating side wheel. it can.
Furthermore, this invention can be applied not only to wheel bearings for driving wheels but also to wheel bearings for driven wheels.

It is sectional drawing of the bearing for wheels with a bidirectional | two-way communication function concerning 1st Embodiment of this invention. It is the side view which looked at the same bearing for wheels with a bidirectional communication function from the inboard side. It is the schematic which shows an example of a connector. It is sectional drawing which shows other embodiment of this invention. It is sectional drawing which shows other embodiment of this invention. It is sectional drawing which shows other embodiment of this invention. It is sectional drawing which shows other embodiment of this invention. It is sectional drawing which shows other embodiment of this invention.

Explanation of symbols

1. Outer member (fixed ring)
2 ... Inward member (rotating wheel)
3, 4 ... rolling surface 5 ... rolling element 21 ... bi-directional communication means 22 ... primary coil 23 ... stator core 24 ... secondary coil 25 ... rotor cores 26, 27 ... wiring 28, 29 ... wiring hole 30 ... wiring groove 31, 32 ... Connectors 38, 39 ... Bidirectional communication auxiliary means

Claims (11)

A fixed ring having a double row rolling surface, a rotating wheel having a rolling surface facing the rolling surface of the fixed wheel, and a double row rolling element interposed between the facing rolling surfaces. In the wheel bearing that supports the wheel rotatably with respect to the vehicle body,
Bidirectional communication means for bidirectionally communicating in a non-contact manner is provided between the fixed wheel and the rotating wheel, and one or both of the fixed wheel and the rotating wheel are connected to the bidirectional communication means. A wheel bearing with bidirectional communication function, comprising a connector, wherein the connector has a connector for connecting wiring to a tire or a wheel side, and the connector is disposed on an inner diameter portion of the rotating wheel. A fixed ring having a double row rolling surface, a rotating wheel having a rolling surface facing the rolling surface of the fixed wheel, and a double row rolling element interposed between the facing rolling surfaces. In the wheel bearing that supports the wheel rotatably with respect to the vehicle body,
Bidirectional communication means for bidirectionally communicating in a non-contact manner is provided between the fixed wheel and the rotating wheel, and one or both of the fixed wheel and the rotating wheel are connected to the bidirectional communication means. A wheel bearing with two-way communication function, characterized in that it has a connector and has a connector for connecting wiring to the tire or wheel side as the connector, and this connector is arranged on a flange provided on the rotating wheel. . 3. The bidirectional communication unit according to claim 1 , wherein the bidirectional communication means includes a primary coil wound around a core provided on the fixed wheel and a secondary coil wound around a core provided on the rotating wheel. A magnetic bearing is constituted by the primary coil and the secondary coil, and the wheel bearing with bidirectional communication function is provided. 4. The wheel bearing with bidirectional communication function according to claim 3 , wherein the bidirectional communication means performs data communication and power transmission at different frequencies. The wheel bearing with a bidirectional communication function according to claim 4 , wherein the cores of the primary coil and the secondary coil are divided into a low-frequency core and a high-frequency core. The wheel bearing with bidirectional communication function according to any one of claims 1 to 5 , further comprising confirmation means for confirming whether communication by the bidirectional communication means is normally established. 7. The magnetic circuit according to claim 1 , wherein the magnetic circuit in the bidirectional communication unit includes one or both of a part of the fixed wheel and a part of the rotating wheel. Wheel bearing with bidirectional communication function. In any one of claims 1 to 7, wherein the connector, the rotary wheel or wheel bearing with two-way communication function, characterized in that fixed to the fixed ring. In any one of claims 1 to 8, wherein either or both of the stationary ring and the rotating ring, the wiring for exiting wire outside of the bearing from the peripheral surface facing with these fixed wheel rotation wheel A bearing for a wheel with a bidirectional communication function, comprising a hole or a wiring groove. In any one of claims 1 to 9, has the function of the bidirectional communication means for transmitting the power to either one or both of the fixed ring and the rotating ring, the stabilization of the power transmitting A wheel bearing with a bidirectional communication function, comprising a control circuit for performing In any one of claims 1 to 10, the fixed side of the two-way communication auxiliary means having means for generating an AC voltage for transmitting the power to the rotating wheel side from the stationary wheel side to the bidirectional communication means Rotating-side bidirectional communication auxiliary means having means for generating a carrier wave for transmitting data from the rotating wheel side to the fixed wheel side and superimposing a signal on the carrier wave is provided in the bidirectional communication means. Wheel bearing with bidirectional communication function.

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