JP2005084998A - Bearing device with wireless sensor - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a bearing device with a wireless sensor which can perform the transmission of a sensor signal and the power feeding to a sensor part or the like, and can detect not only a rotational speed but also a rotating direction. <P>SOLUTION: A rolling bearing 10 comprises the sensor part 6 for detecting rotation, a sensor signal transmission part 9 for transmitting the sensor signal wirelessly, and a power receiving part 8. The power receiving part 8 is a means for receiving operating power of the sensor part 6 and the sensor signal transmission part 9 wirelessly. The sensor part 6 outputs two rotation number signals whose phase difference is almost 90°. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to a bearing device with a wireless sensor that wirelessly transmits a rotation number detection signal in a rolling bearing in a mechanical facility, a wheel bearing of an automobile, or the like.

A wireless ABS (anti-lock brake system) sensor has been proposed in which a signal from a rotation sensor mounted on a wheel bearing device is transmitted wirelessly to eliminate a harness between a wheel and a vehicle body (for example, Patent Document 1). As the rotation sensor, a multipolar rotary generator is used, and the sensor power and the transmitter power are obtained by self-power generation. This eliminates the need for power supply wiring from the vehicle body to the rotation sensor. By making it wireless in this way, advantages such as weight reduction and avoidance of failure due to disconnection of the harness due to stepping stones are obtained. In addition, in a wheel bearing device, it has also been proposed to supply power to a rotation sensor wirelessly (for example, Patent Document 2). According to wireless power feeding, unlike the case of using the power generation function, rotation detection and sensor signal transmission can be performed even when rotation is stopped or at low speed. Also, unlike those equipped with batteries, there is no need to replace and manage batteries.
JP 2002-264786 A JP 2003-146196 A

  In each of the above proposed examples, the rotational speed is detected, but the rotational direction cannot be recognized, and there is still one point that is not sufficient for improving the control. For example, there is a control called a hill hold function in an automobile. This is a control function that activates the braking function when the vehicle moves in a direction opposite to the driver's intention. For example, when the vehicle is reverse when the automatic idling is stopped in a state where the gear is engaged in a forward state while waiting for a signal on an uphill, the reverse is detected and a braking operation or the like is performed. Thereby, the safety of the automatic idling stop can be achieved. In the bearing device with a wireless sensor of each of the above proposal examples, rotation is detected, but in which direction it has been rotated cannot be identified on the control side and cannot be used as a sensor for the hill hold function as described above. Even in a rolling bearing in an industrial machine, if the direction of rotation can be recognized, more advanced control becomes possible. However, such a control cannot be performed in a conventional bearing device with a wireless sensor.

  An object of the present invention is to provide a bearing device with a wireless sensor that can both transmit a sensor signal and supply power to a sensor unit wirelessly and detect not only the rotation speed but also the rotation direction.

The bearing device with a wireless sensor of this invention has an outer member (1, 55), an inner member (2, 54), and a plurality of rolling elements (3, 56) interposed between these outer and inner members. A sensor unit (6) for detecting the rotation of the rolling bearing (10, 33) and a sensor signal transmission unit (for wirelessly transmitting a sensor signal output from the sensor unit (6)) to the rolling bearing (10, 33). 9) and a power receiving section (8) for wirelessly receiving the operating power of the sensor section (6) and the sensor signal transmitting section (9), and the sensor section (6) has a phase difference of approximately 90 °. It is assumed that two rotation speed signals are output.
According to this configuration, the sensor unit (6) outputs two rotation speed signals having a phase difference of approximately 90 °, and the two rotation speed signals are transmitted wirelessly from the sensor signal transmission unit (9). Therefore, on the control side, in addition to the rotational speed, the rotational direction can be recognized. Further, the power reception unit (8) can wirelessly receive the operating power of the sensor unit (6) and the sensor signal transmission unit (9). As described above, both transmission of the sensor signal and power supply to the sensor unit (6) and the like can be performed wirelessly, and not only the rotation speed but also the rotation direction can be detected.

The sensor signal transmission unit (9) may transmit two rotation number signals having the phase difference of approximately 90 ° on one carrier wave.
By transmitting two rotation speed signals on one carrier wave, power consumption for wireless transmission is reduced. Wireless power supply is not as efficient as power supply by wiring or power supply by generator, so it is necessary to transmit a large amount of power to the power supply, and the reduction in power consumption of the sensor transmitter is a great advantage in terms of energy saving. Become. The format in which two rotation speed signals are carried on one carrier wave may be, for example, transmission by time division or superposition with appropriate signal processing.

The sensor signal transmission unit (9) may carry two rotation number signals having a phase difference of approximately 90 ° on two carrier waves having different frequencies.
In the case of this configuration, the sensor signal transmission unit (9) has a simple configuration because two sensor signal transmission units (9) are provided to transmit two rotation speed signals independently. That's it.

In the present invention, there may be provided a multiplying means (19) for multiplying the rotation speed signal output from the sensor section (6) and transmitting it to the sensor signal transmitting section (9).
By multiplying, the number of rotation pulses can be increased without reducing the pitch of the magnetic poles and the like in the detected part of the sensor unit (6). Therefore, the rotation detection accuracy can be increased with a simple configuration.
The multiplication means (19) may detect the rising and falling edges of the pulse of the sensor unit (6) and multiply the number by two, or may perform two rotations with different phases. It may be one that is multiplied by 4 using several signals.

In the present invention, the sensor section (6) may comprise a pulsar ring (17) made of a multipolar magnet having a large number of magnetic poles in the rotational direction and a magnetic sensor (18) for detecting the magnetic poles. . The magnetic sensor (18) may be a magnetoresistive magnetic sensor.
According to the combination of the pulsar ring (17) composed of multipolar magnets and the magnetic sensor (18), a small and accurate rotation sensor can be constructed. In addition, since the magnetoresistive magnetic sensor consumes less power, it is preferable as a sensor combined with wireless power feeding that has lower power feeding efficiency than power feeding by wiring.

In the present invention, the sensor section (6) outputs an origin signal for each rotation in addition to the two rotation speed signals having the phase difference of approximately 90 °, and the sensor signal transmission section (9) The rotation speed signal and the origin signal may be transmitted.
By using the sensor unit (6) capable of outputting the origin signal, the absolute position can be detected, and more advanced control can be easily performed.

In the bearing device with a wireless sensor of the present invention, the rolling bearing is opposed to an outer member (1) having a double row raceway surface and an inner member (2) having a raceway surface facing the raceway surface. A wheel bearing may be provided that includes a plurality of rolling elements (3) interposed between the raceway surfaces of both rows and rotatably supports the wheel with respect to the vehicle body.
In the wheel bearing device, the rotation speed signal of the sensor unit (6) is used for an antilock brake system (ABS) and a traction control system (TCS). In this case, in the present invention, since the wheel rotation direction can be detected, the sensor unit (6) can also be used as a hill hold function sensor. Further, in the wheel bearing device, it is preferable to eliminate the harness between the wheel and the vehicle body and make it wireless in terms of weight reduction and prevention of disconnection failure due to rock jumping and the like.

A wireless sensor-equipped bearing device system according to the present invention includes a wireless sensor-equipped bearing device according to any one of the above-described configurations and a sensor signal receiving unit that receives a sensor signal transmitted from the sensor signal transmitting unit (9). (13) and a feeding power transmission unit (12) that wirelessly transmits operating power to the power reception unit (8), and a multiplication unit that multiplies the rotation speed signal received by the sensor signal reception unit (12). (19A) is provided. No multiplier means is provided on the transmission side.
By multiplying, the rotation detection accuracy can be increased as described above. However, by providing a multiplying means on the receiving side, the portion operating by wireless power feeding can be simplified, which is advantageous in power feeding.

  A bearing device with a wireless sensor according to the present invention includes a sensor unit that detects rotation of the rolling bearing, a sensor signal transmission unit that wirelessly transmits a sensor signal output from the sensor unit, and the sensor unit and the sensor. A power receiving unit that wirelessly receives the operating power of the signal transmitting unit, and the sensor unit outputs two rotational speed signals having a phase difference of approximately 90 °. Both the power can be supplied wirelessly and the rotation direction as well as the rotation direction can be detected.

  A first embodiment of the present invention will be described with reference to FIGS. The bearing device with a wireless sensor includes a sensor unit 6 that detects the rotation of the rolling bearing 10, a sensor signal transmission unit 9 that wirelessly transmits a sensor signal output from the sensor unit 6, and the sensor. A power receiving unit 8 that wirelessly receives operating power of the unit 6 and the sensor signal transmitting unit 9 is provided. The sensor unit 6 outputs two rotation speed signals (A phase signal and B phase signal) having a phase difference of approximately 90 °. The output of the sensor unit 6 is sent to the sensor signal transmission unit 9 via the signal processing means 14 or directly. Note that the signal processing means 14 and the sensor signal transmission unit 9 receive, in addition to the two rotation number signals output from the sensor unit 6, for example, a detection signal from another sensor unit (not shown) such as a temperature sensor. It may be performed from the sensor signal transmission unit 9 together with the signal.

  The rolling bearing 10 has a plurality of rolling elements 56 interposed between raceways facing the inner ring 54 and the outer ring 55. Each rolling element 56 is held by a holder 57. The end of the bearing space between the inner and outer rings 54 and 55 is sealed with a seal 58. In the rolling bearing 10, either the inner ring 54 or the outer ring 55 may be on the rotation side, but in this example, the outer ring 55 is installed in a housing (not shown) to become a stationary side, and the inner ring 54 is fitted to the shaft 59. In combination, the shaft 59 is rotatably supported. The rolling bearing 10 is shown as a single row in the example of FIG. 1, but may be a double row. The rolling bearing 10 may be a bearing for any application. For example, it may be a conveyor used as a factory machine equipment, for example, a bearing for supporting a drive roller of a conveyor, a bearing constituting a machine tool or an industrial machine, or a bearing for a vehicle wheel. Examples applied to automobile wheel bearings will be described in detail later.

  The sensor unit 6, the sensor signal transmission unit 9, and the power reception unit 8 are configured as an integrated wireless sensor unit 4. However, the pulsar ring 17 described later in the sensor unit 6 is separate from the wireless sensor unit 4. When the signal processing means 14 is provided, the signal processing means 14 is also included in the wireless sensor unit 4. A sensor signal receiver 5 that wirelessly supplies power and receives each sensor signal to the wireless sensor unit 4 is provided.

  The sensor signal receiver 5 includes a sensor signal receiving unit 13 that receives the sensor signal transmitted from the sensor signal transmitting unit 9 and a power supply power transmitting unit 12 that wirelessly transmits operating power to the power receiving unit 8. The sensor signal receiver 5 may receive sensor signals and transmit operating power to the plurality of wireless sensor units 4. In that case, for example, for each wireless sensor unit 4, the sensor signal to be transmitted has a different frequency.

Transmission / reception between the sensor signal transmission unit 9 and the sensor signal reception unit 13 and between the feeding power transmission unit 12 and the power reception unit 8 may be performed by electromagnetic waves, or by light waves, infrared rays, ultrasonic waves, Alternatively, it may be performed by magnetic coupling.
When communication is performed using electromagnetic waves, the frequency of the sensor signal to be wirelessly transmitted and the frequency of the feeding power are different from each other, and the plurality of sensor signals provided are also different from each other. Here, the frequency of the feed power is f ₁ and the frequency of the sensor signal is f ₂ . When one sensor signal receiver 5 receives sensor signals and transmits operating power to a plurality of wireless sensor units 4, the sensor signal frequency is set to a different frequency for each wireless sensor unit 4. And The frequency of the supplied power may be the same or different for each wireless sensor unit 4.

  The power reception unit 8 includes a tuning circuit, a detection rectification circuit, and the like when wireless power feeding is performed using electromagnetic waves. The power receiving unit 8 may include a capacitor or a secondary battery that stores received power, and a charging circuit thereof.

  The sensor unit 6 includes a pulsar ring 17 and a magnetic sensor 18 installed to face the pulsar ring 17. As shown in FIG. 2, the pulsar ring 17 periodically changes in the circumferential direction, such as a magnet magnetized in multiple poles in which the magnetic poles N and S are arranged in the circumferential direction, or a magnetic ring with gear-like irregularities. It is what you have. According to the combination of the pulsar ring 17 made of a multipolar magnet and the magnetic sensor 18, a small and accurate rotation sensor can be configured. The magnetic sensor 18 includes two detectors 18A and 18B facing two locations whose phases are approximately 90 ° apart from the period of the magnetic change in the circumferential direction of the pulsar ring 17, and the rotational speeds that are approximately 90 ° different in phase. A signal is output from each detector 18A, 18B. Each rotation speed signal is a pulse train as shown in FIG. 3, and becomes two rotation speed signals of A phase and B phase having a phase difference of about 90 °.

  The magnetic sensor 18 is a magnetic field sensor, and each of the detection units 18A and 18B is a magnetic field sensor. As this magnetic field sensor, an active magnetic field sensor such as a Hall element type sensor, a fluxgate type magnetic field sensor, or an MI sensor can be used in addition to a magnetoresistive sensor (referred to as “MR sensor”). Of the above, each of the detection units 18A and 18B is preferably a magnetoresistive type. The magnetoresistive magnetic sensor is advantageous for application to wireless power feeding because power consumption can be reduced by increasing the resistance value.

  As shown in FIG. 1, the pulsar ring 17 of the sensor unit 6 is attached to the inner ring 54 of the rolling bearing 10 via an attachment member 17a. The magnetic sensor 18 is housed in a common case 4a together with the power receiving unit 8 and the sensor signal receiving unit 9 to form the wireless sensor unit 4, and is attached to the outer ring 55 via the mounting member 4b.

The A-phase and B-phase rotation speed signals of the sensor unit 6 are processed by the signal processing unit 14 into a form suitable for wireless transmission by the sensor signal transmission unit 9 and transmitted from the sensor signal transmission unit 9.
The sensor signal transmission unit 9 transmits, for example, two rotation number signals of A phase and B phase on one carrier wave. The format in which two rotation speed signals are carried on one carrier wave may be, for example, transmission by time division or superposition with appropriate signal processing. The signal processing means 14 is a circuit that performs such processing for performing time-division transmission or superimposition. By transmitting two rotation speed signals on one carrier wave, power consumption for wireless transmission is reduced. Wireless power supply is not as efficient as power supply by wiring or power supply by generator, so it is necessary to transmit a large amount of power to the power supply, and the reduction in power consumption of the sensor transmitter is a great advantage in terms of energy saving. Become.

FIG. 4 shows a specific example of processing in which the signal processing means 14 transmits two rotation number signals of A phase and B phase on one carrier wave. In this case, the signal of frequency f _A (Hz) is ASK (Amplitude shift keying) modulated with the A phase signal (a), and the signal of frequency f _B is modulated with the B phase signal. FIGS. 7B and 7D show the ASK modulation results of the A-phase and B-phase signals, respectively. The carrier wave is FM-modulated and transmitted with the signal (e) obtained by adding the two ASK-modulated signals (b) and (d). On the reception side, the sensor signal is demodulated after separating the above summed signal (e) into two ASK modulated signals (b) and (d) by a filter. The signal processing means including the filter and the demodulating means may be provided in the sensor signal receiving unit 13 or may be provided separately from the sensor signal receiving unit 13.

The sensor signal transmission unit 9 transmits two rotation speed signals (A phase signal and B phase signal) having a phase difference of approximately 90 °, for example, at two different frequencies f ₂ and f ₃ as shown in FIG. It is good also as what carries on a carrier wave, respectively. In that case, as shown in the figure, two sensor signal transmitters 9 are provided, and the sensor signal transmitters 9 and 9 are provided with a rotation speed signal of the A-phase detector 18A and a rotation speed signal of the B-phase detector 18A. May be transmitted. On the sensor signal receiver 5 side, for example, two sensor signal receivers 13 and 13 corresponding to the transmission frequencies f ₂ and f ₃ are provided.
In this way, when the two rotation speed signals are transmitted on the carrier waves having different frequencies f ₂ and f ₃ , the processing for placing the two signals on one carrier wave is not required, and the sensor signal transmitting unit 9 Alternatively, the configuration including the signal processing means in the preceding stage can be simplified.

According to the bearing device with a wireless sensor having this configuration, the relative rotation between the inner ring 54 and the outer ring 55 is detected as a rotation number signal by the sensor unit 6 and wirelessly transmitted from the sensor signal transmission unit 9, and the sensor signal receiver 5. Are received by the sensor signal receiver 13. The sensor unit 6 outputs two rotation speed signals of an A-phase signal and a B-phase signal having a phase difference of approximately 90 °, and these two rotation speed signals are received by the sensor signal receiving unit 13. Besides, the direction of rotation is also detected. For this reason, it is possible to increase the functionality of the control of the equipment equipped with the rolling bearing 10.
Drive power is wirelessly transmitted from the power supply transmission unit 12 of the sensor signal receiver 5 to the bearing device with the wireless sensor, and is received by the power reception unit 8 to receive the sensor unit 6, the sensor signal transmission unit 9, and signal processing. Used for driving the means 14 (FIG. 1 only) and the like. Therefore, in the bearing device with a wireless sensor, it is unnecessary to provide a battery or a generator, there is no troublesome battery life management as in the case of using a battery, and at the time of low-speed rotation as in the case of driving with a generator. There is no undetectable problem, and rotation can be detected from the O speed. As described above, both transmission of the sensor signal and power supply to the sensor unit 6 and the like can be performed wirelessly, and not only the rotation speed but also the rotation direction can be detected.

6 and 7 show another embodiment of the present invention. In this embodiment, there is provided a multiplication means 19 that multiplies the rotation speed signal output from the sensor unit 6 and transmits it to the sensor signal transmission unit. The multiplying means 19 may be one that detects the rising and falling edges of the rotation speed signal composed of pulses from the sensor unit, and doubles the rotation speed signal. Further, the multiplication means 19 uses four rotation speed signals having different phases. Multiplication may be used.
7A and 7C show the A-phase rotation speed signal and the B-phase rotation speed signal respectively output from the detection sections 18A and 18B of the sensor section 6, and FIG. 7B shows the A-phase rotation speed signal. An output pulse obtained by multiplying the rotation number signal by 2 by the multiplication means 19 as described above is shown. FIG. 4D shows an output pulse obtained by multiplying the B-phase rotation number signal by 2 by the multiplying means 19 as described above. Note that the rotation speed signal may be multiplied by only one of the A phase and the B phase. If either one is multiplied, the rotational speed can be detected with high accuracy, and the rotational direction can be directly compared between the A-phase and B-phase rotational speed signals.
FIG. 8 shows a waveform diagram in the case of quadruple multiplication. From the A-phase rotation speed signal and the B-phase rotation speed signal having different phases shown in FIGS. 9A and 9B, a quadruple signal shown in FIG.

The rotation speed signal multiplied by the multiplication means 19 in FIG. 6 is processed by the transmission processing means 14a into a format suitable for transmission by the sensor signal transmission section 9. The multiplication means 19 and the signal processing means 14a constitute a signal processing means 14.
Note that the rotation speed signals of the A-phase and B-phase detection units 18A and 18B may be respectively multiplied by the multiplication means 19 and transmitted from different sensor signal transmission units 9 as in the example of FIG. .

  Thus, by providing the multiplication means 19 and multiplying, the number of rotation pulses can be increased without reducing the pitch of the magnetic poles or the like in the pulsar ring 17 that becomes the detected portion of the sensor unit 6. Therefore, the rotation detection accuracy can be increased with a simple configuration at low cost.

As shown in FIG. 9, the multiplication means 19 </ b> A may be provided in the sensor signal receiver 5 and the multiplication means 19 (FIG. 6) of the wireless sensor unit 4 may be omitted. The multiplication means 19A of FIG. 9 is a means for multiplying the rotational speed signal received by the sensor signal receiving unit 13 of the sensor signal receiver 5. This multiplication means 19A may also be one that doubles or four times as in the examples of FIGS. The sensor signal receiver 5 and the rolling bearing 10 having the wireless sensor unit 4 of FIG. 1 constitute a bearing device system with a wireless sensor.
Thus, when the multiplying means 19A is provided on the receiving side, the portion that operates by wireless power feeding can be simplified, which is advantageous in power feeding.

  FIG. 10 shows an example in which the sensor unit 6 has an origin signal. The sensor unit 6 includes a rotation detected unit 17a in which a pulsar ring 17 is formed by arranging the magnetic poles N and S in the circumferential direction, and an origin detected unit provided adjacent to the axial direction of the rotation detected unit 17a. 17b. The origin detected part 17b is configured by one or two or three magnetic poles provided at one place on the entire circumference of the pulsar ring. The magnetic sensor 18 is composed of A-phase and B-phase detection units 18A and 18B installed to face the rotation detection unit 17a, and a detection unit 18C facing the origin detection unit 17b. The sensor unit 6 constitutes the wireless sensor unit 4 in the example of FIG. 1 or the example of FIG. 5 or FIG.

  The origin signal detected by the detection unit 18C is processed by, for example, the signal processing unit 14 of FIG. 1 and is superimposed on the A-phase and B-phase rotation speed signals, or the A-phase and B-phase rotation speed signals. Separately, it is transmitted from the sensor signal transmitter 9. The transmitted origin signal is received by the sensor signal receiver 13 in the sensor signal receiver 5.

  As described above, when the sensor unit 18 capable of outputting the origin signal is used, the absolute position can be detected, and more advanced control can be easily performed.

  Next, each example in which this bearing device with a wireless sensor is applied to a wheel bearing device will be described with reference to FIGS. In FIG. 11, the wheel bearing device 33 is interposed between the outer member 1 having a double-row raceway surface, the inner member 2 having a raceway surface facing the raceway surface, and the opposite raceway surfaces. The plurality of rolling elements 3 are provided, and the wheels are rotatably supported with respect to the vehicle body. The wheel bearing device 33 in the figure is of the fourth generation type, and the inner member 2 is composed of a hub wheel 2A and an outer ring 15a of a constant velocity joint 15 and these hub wheel 2A and constant velocity joint outer ring 15a. Further, the raceway surface of each row on the inner member 2 side is formed.

  A wireless sensor unit 4 is installed on the outer member 1 of the wheel bearing device 33. In this wireless sensor unit 4, the circuit box unit 24 and the sensor installation unit 23 are integrated to form a unit, and the circuit box unit 24 is installed on the outer surface of the outer member 1. The sensor installation portion 23 faces the bearing inner space through a radial hole provided in the outer member 1. In the circuit box unit 24, the power receiving unit 8, the sensor signal receiving unit 9, and the signal processing unit 14 of FIG. 1 are provided. In the sensor installation unit 23, the detection units 18A and 18B of the magnetic sensor 18 constituting the sensor unit 6 are installed. The pulsar ring 17 is installed on the rotation-side inner member 2 at a position facing the sensor installation unit 23. That is, it is provided on the outer peripheral surface of the hub wheel 2A.

  The sensor receiver 5 is attached to the vehicle body side. For example, it is attached in a tire house (not shown) of the vehicle body. The sensor signal received by the sensor receiver 5 is sent to an electric control unit (ECU) that controls the entire vehicle provided on the vehicle body, and is used for various controls.

According to the wheel bearing device with a wireless sensor having this configuration, the rotational speed signal of the sensor unit 6 is used for an antilock brake system (ABS) and a traction control system (TCS). Currently, the intelligentization of automobiles is progressing rapidly, and many functions to assist the driver are being proposed or realized. As one of the intelligent vehicles, the wheel bearing device with wireless sensor of this configuration can output the A phase and B phase and detect the wheel rotation direction. It can be used as a sensor. For example, when an automatic idling is stopped while waiting for a signal on an uphill and the transmission is shifted to a forward movement state, if the vehicle moves backward, the backward movement is detected and a braking operation or the like is performed. Further, when the vehicle moves forward while being shifted in the reverse direction, the forward movement is detected and a braking operation or the like is performed. Thereby, the safety of the automatic idling stop can be achieved. To describe the hill hold control a little more, when the automatic vehicle starts off the slope, when the foot is released from the brake, if the slope of the slope is large, the vehicle may move backward without having only the creep of the torque converter. In particular, when idling is stopped, the possibility of this occurring increases. This is a function for detecting the reverse and braking it. If the vehicle retreats when starting on a hill, it may cause a sudden start by stepping on the accelerator too much. For this purpose, this function is used to brake backwards. As described above, when outputs of the A phase and the B phase are obtained as the rotation speed signal and the rotation direction can be detected, it can be used for such control.
In addition, this wheel bearing device with wireless sensor wirelessly sends and receives sensor signals and feeds power, so the harness between the wheel and the vehicle body can be eliminated, weight reduction can be achieved, and disconnection failure due to stone jumping, etc. Is avoided. Unlike wireless sensors that use the power generated by a rotation sensor that has a power generation function, rotation can be detected up to O-speed, enabling more advanced control, and battery life as in the case of using a battery. Saves management and battery replacement.

FIG. 12 shows an example in which this wireless sensor bearing device is applied to another type of wheel bearing device. This wheel bearing device 33 is of a third generation type, and the inner member 2 is composed of a hub wheel 2A and an inner ring 2B fitted to the outer periphery of one end thereof. The raceway surface of each row on the inner member 2 side is formed. The constant velocity joint 15 has a shaft portion provided on the outer ring 15a inserted into the hub wheel 2A and coupled to the hub wheel 2A with a nut.
The wireless sensor unit 4 is attached to the end of the outer member 1. The sensor unit 6 of the wireless sensor unit 4 includes a pulsar ring 17 and a magnetic sensor 18. Although the pulsar ring 17 and the magnetic sensor 18 are provided so as to face each other in the axial direction, the pulsar ring 17 is composed of a multipolar magnet, and the magnetic sensor 18 is approximately 90 °, as shown in FIGS. It is composed of two detectors 18A and 18B (not shown in FIG. 12) separated from each other. The pulsar ring 17 is provided as a component of a seal device 27 that seals the bearing space between the outer member 1 and the inner member 2. Other configurations of the wheel bearing device 33 are the same as the example shown in FIG.

  FIG. 13 shows an example applied to another type of wheel bearing device 33. The wheel bearing device 33 is for a third generation driven wheel. In this example, the wireless sensor unit 4 is attached to a cover 25 that covers the bearing end. As in the embodiment of FIG. 12, the wireless sensor unit 4 has a sensor unit 6 in which a pulsar ring 17 and a magnetic sensor 18 are opposed in the axial direction, and the pulsar ring 17 is attached to the inner member 2. Yes. Further, the inner ring 2B is coupled by crimping the shaft end of the hub ring 2A. Other configurations in this embodiment are the same as the example shown in FIG.

It is explanatory drawing which combined sectional drawing of the wireless sensor-equipped bearing apparatus concerning 1st Embodiment of this invention, and the block diagram which shows the conceptual structure of the control system. It is explanatory drawing of the sensor part in the same bearing device with a wireless sensor. It is a wave form diagram of the rotation speed signal of the sensor part. It is a wave form diagram of the signal processing example of the rotation speed signal. It is a block diagram which shows the conceptual structure of the control system of the bearing apparatus with a wireless sensor concerning other embodiment of this invention. It is a block diagram which shows the conceptual structure of the control system of the bearing apparatus with a wireless sensor concerning further another embodiment of this invention. FIG. 6 is a waveform diagram of a rotation speed signal and a doubled output of the sensor unit. It is a waveform diagram of the rotation speed signal and quadruple output of the sensor unit. It is a block diagram of the sensor signal receiver in the bearing apparatus system with a wireless sensor concerning further another embodiment of this invention. It is a perspective view of the modification of a sensor part. It is sectional drawing of the wheel bearing apparatus with a wireless sensor concerning further embodiment of this invention. It is sectional drawing of the wheel bearing apparatus with a wireless sensor concerning further another embodiment of this invention. It is sectional drawing of the wheel bearing apparatus with a wireless sensor concerning further another embodiment of this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 ... Outer member 2 ... Inner member 4 ... Wireless sensor unit 5 ... Sensor signal receiver 8 ... Electric power receiving part 9 ... Sensor signal receiving part 10 ... Rolling bearing 12 ... Feed power transmission part 13 ... Sensor signal receiving part 14 ... Signal processing means 17 ... pulsar ring 18 ... magnetic sensors 18A to 18C ... detectors 19, 19A ... multiplication means 54 ... inner ring 55 ... outer ring

Claims (9)

  A sensor unit for detecting the rotation of the rolling bearing and a sensor signal output by the sensor unit are provided on a rolling bearing having an outer member, an inner member, and a plurality of rolling elements interposed between the outer and inner members. A sensor signal transmission unit that transmits wirelessly and a power reception unit that wirelessly receives the operation power of the sensor unit and the sensor signal transmission unit are provided. The sensor unit has two rotation speeds having a phase difference of approximately 90 °. A bearing device with a wireless sensor that outputs signals.   2. The bearing device with a wireless sensor according to claim 1, wherein the sensor signal transmission unit transmits two rotation speed signals having a phase difference of approximately 90 ° on one carrier wave.   The wireless sensor-equipped bearing device according to claim 1, wherein the sensor signal transmission unit carries two rotation speed signals having the phase difference of about 90 ° on two carrier waves having different frequencies.   4. The bearing device with a wireless sensor according to claim 1, further comprising a multiplying unit that multiplies the rotation speed signal output from the sensor unit and transmits the multiplied signal to the sensor signal transmission unit.   5. The bearing device with a wireless sensor according to claim 1, wherein the sensor unit includes a pulsar ring composed of a multipolar magnet having a large number of magnetic poles in a rotating direction and a magnetic sensor for detecting the magnetic poles.   6. The bearing device with a wireless sensor according to claim 5, wherein the magnetic sensor is a magnetoresistive magnetic sensor.   7. The sensor unit according to claim 1, wherein the sensor unit outputs an origin signal for each rotation in addition to two rotation speed signals having a phase difference of approximately 90 degrees. The transmission unit is a bearing device with a wireless sensor that transmits the rotation speed signal and the origin signal.   8. The rolling bearing according to claim 1, wherein the rolling bearing includes an outer member having a double-row raceway surface, an inner member having a raceway surface facing the raceway surface, and both rows of raceways facing each other. A bearing device with a wireless sensor, which is a wheel bearing including a plurality of rolling elements interposed between surfaces and rotatably supporting a wheel with respect to a vehicle body.   A bearing device with a wireless sensor according to any one of claims 1 to 3, a sensor signal receiving unit that receives a sensor signal transmitted from the sensor signal transmitting unit, and operating power to the power receiving unit wirelessly. A bearing device system with a wireless sensor provided with a feed power transmission unit for transmission and a multiplying unit for multiplying a rotation speed signal received by the sensor signal reception unit.

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