JPH0512748Y2 - - Google Patents

Description

[Detailed description of the invention] "Industrial Application Field" The present invention relates to a rotating body torque measuring device for accurately measuring the torque due to the rotating shaft of an internal combustion engine or any other rotating body on a measuring bench or the like. .

``Prior art'' Japanese Patent Application Laid-Open No. 131677/1984 discloses that a strain gauge is attached to the inner surface of a hollow shape, a wireless transmitter is installed and sealed, and a communication antenna wire connected to the transmitter is attached to the surrounding wall. A coupling structure is disclosed that includes a torque meter that is insulated and wrapped around the outer surface of the coupling through the coupling, and the transmitted electrical signal is detected by an external receiver.

Incidentally, Japanese Unexamined Patent Publication No. 57-137997 discloses an instrument rotary transformer and a manufacturing method.

``Problems to be solved by the invention'' However, the structure of the coupling for torque measurement shown in the above-mentioned Japanese Patent Application Laid-Open No. 131677/1983 does not have a pore through which the lead wire connecting the transmitting antenna and the wireless transmitter is passed. It must be bored into the peripheral wall of the hollow coupling, but if torque is to be measured with high precision, the wall thickness of the hollow coupling must be as thin as possible. For this reason, when holes are drilled in the peripheral wall of a hollow coupling as described above, the strength of the hollow coupling decreases, and the strain gauge is affected by bending moment and stress concentration, making it difficult to accurately measure torque. There is. Further, in the instrument rotary transformer described in Japanese Patent Application Laid-Open No. 57-137997, a detailed torque measurement structure is not disclosed, so there is a problem that accurate torque measurement is difficult. This invention was made to solve the above problems,
It is an object of the present invention to provide a rotational torque measuring device that can accurately measure torque.

"Means for Solving the Problems" The rotating body torque detection device of the present invention has a rotary body torque detecting device that has an inner diameter of at least 1/10 of the inner diameter of the measuring cylinder at the connecting part between the flanges at both ends of the measuring hollow cylinder and the measuring cylinder. forming a thick part having a wall thickness of A lead wire is arranged and fixed on the outer wall of the measuring cylindrical part, and connects the sensor to the transmitting circuit. It is characterized by:

"Function" The rotating body torque detection device of the present invention having the above-described configuration has a wall thickness of one-tenth or more of the inner diameter of the measuring cylindrical part at the connection part between the flanges at both ends and the measuring cylindrical part at the center. A measuring cylindrical portion is formed in which the sensor is placed from a position at least twice the difference between the thickness of the thick portion and the thickness of the measuring cylindrical portion from the central end of the thick portion to the center of the measuring cylindrical portion. Because the sensor is installed and fixed on the outer wall of the sensor, when torque is applied to the measuring cylinder during measurement, even if stress is concentrated at the connection between the flange and the measuring cylinder, the thick wall part relieves the stress. In addition to solving deformation and strength problems related to the accuracy of the sensor, even if a bending moment is applied to the measurement cylinder, the rigidity of the thick wall part prevents the sensor part from being affected by cross-sectional deformation, etc. It is possible to accurately detect the signal corresponding to the applied torque, and by keeping the sensor a certain distance away from the thick wall part,
Even if stress concentration occurs at the connection between the flange part and the measurement cylinder part during measurement, the influence of the stress state will not be exerted on the sensor, making highly accurate torque measurement possible.

(Embodiment) In the rotating body torque measuring device according to the first aspect of the present invention, the transmitting circuit is inserted into a case made of a magnetic material, and the case is coaxially disposed within the inner diameter part of the measurement hollow cylinder. Since it is fixed, it has the advantage that the centrifugal force generated during rotation can be reduced, and the influence of noise due to electromagnetic induction can be blocked.

In the rotating body torque measuring device according to a second aspect of the present invention, the second coil is formed of a coil formed in an annular shape corresponding to the first coil, and the first and second coils are connected to each other over the entire circumference of the coil. It has been made to correspond.

The second aspect of the device having the above configuration has the advantage that since both the first and second coils are annular and face each other over the entire circumference, the state of magnetic coupling during rotation can be made uniform. has.

The rotating body torque measuring device according to the third aspect of the present invention has a second coil wound around a substantially U-shaped magnetic core, and a first annular coil. These coils are placed close to and facing a predetermined area, and only need to be placed close to and facing a part of the first ring-shaped coil, so they have a higher degree of freedom in mounting position than a ring-shaped coil that surrounds a rotating measurement hollow cylinder. It has the advantage of being easy to work with.

A rotating body torque measuring device according to a fourth aspect of the present invention has a supporting means and a second coil supported by the supporting means having a split structure so that they can be attached and detached, making it easy to attach the coil before measurement. has advantages.

The rotating body torque measuring device according to the fifth aspect of the present invention has a receiving calculation circuit that detects the receiving frequency and detects a change in the center frequency of the transmitting circuit.
It is equipped with a frequency tracking circuit that changes the tuning frequency to tune in response to changes in the center frequency of the transmitter circuit, and even if the center frequency of the transmitter circuit changes during measurement, it always follows the best tuning state. This has the advantage of enabling highly accurate torque measurement.

"First Embodiment" Next, a rotating body torque measuring device according to a first embodiment of the present invention will be described based on FIGS. 1, 2, and 3.

The device of the first embodiment is a surface plate like the one shown in Fig. 6.
Engine, powertrain installed on B ₇ ,
The device of this embodiment is inserted between the propeller of the system consisting of a dynamometer and the power system instead of the conventional torque measuring device _B4 , and the torque acting on the propeller shaft is measured. The measurement hollow cylinder, which serves as a detection section that also serves as a torque transmission shaft, has a structure consisting of a hollow measurement cylinder section 10 and flanges 11 and 12 disposed at both ends of the measurement cylinder section 10.

One flange 11 is tightened and connected to the flange portion PA of the propeller shaft PS of the engine using a plurality of bolts BT. Further, the other flange 12 is tightened and connected to the flange portion DB of the shaft DS of the dynamometer using a plurality of bolts BT. Four strain gauges (only 2A and 2D are shown in FIG. 1) that are sensitive only to torsional force are attached with adhesive to axially symmetrical positions on the outer circumferential side wall of the axially central position of the measurement cylindrical portion 10. and configure the sensor. In addition, + with respect to the axis
A pair of strain gauges, which were arranged at 45 degrees and -45 degrees in a perpendicular relationship, were each bonded at 180 degrees opposite positions.

That is, the engine rotation and torque input to the flange 11 through the propeller shaft PS are output from the flange 12 to the shaft DS of the dynamometer via the hollow cylinder for measurement. At this time,
A torsional force corresponding to the torque of the engine acts on the measurement cylindrical portion 10 . In response to this torsional force, the sensor constituted by the strain gauge 2 outputs a strain signal corresponding to the engine torque signal.
The measurement cylindrical part 10 has a hollow part with an inner diameter of D,
The thickness of the cross section at the center is t, and the flanges at both ends are 1.
thick portions 13 and 14 having a thickness T greater than the central portion over a certain length at the connection portions 1 and 12;
form. That is, the measuring cylindrical part 10 has flanges 11 and 12 at both ends, and a thick wall part 1 on the inside thereof.
3 and 14, and has a thin cylindrical structure in the center.
The thickness T of the thick portions 13 and 14 is approximately one tenth of the inner diameter D of the hollow portion. The cross-sectional areas of the boundaries between the thick parts 13 and 14 and the flanges 11 and 12, and the boundaries between the thick parts 13 and 14 and the central part (thin part) gradually change in the axial direction, and the longitudinal cross-sections are circular arcs. It has shaped connecting portions 13B, 13C, 14B, and 14C. The axial length of the central part (thin wall part) of the measurement cylindrical part 10 is approximately four times the difference (T-t) between the thickness T of the thick wall parts 13 and 14 and the thickness t of the central part (thin wall part). The strain gauges 2A, 2B, 2C, and 2D are located at the center of the thin wall portion in the axial direction, and the distance from the center end of the thick wall portions 13 and 14 is approximately greater than 2 (T-t). It was pasted on the circumference of Strain signals corresponding to the torques of the strain gauges 2A and 2D are sent to the signal input terminal of the transmitting circuit via the first hole 12h of the flange 12 by a lead wire l adhesively fixed to the outer wall of the measuring cylinder part 10. Connecting.

The transmitting circuit rotates together with the measuring hollow cylinder,
The strain signals from the strain gauges 2A, 2B, 2C, and 2D are converted into radio frequencies for transmission as radio waves.

The transmitting circuit consists of an electronic circuit, which will be described later.In order to protect this electronic circuit from the influence of electromagnetic induction noise, a box 3B made of permalloy, which is a ferromagnetic material, is used.
It was then inserted into the circuit, and then filled with resin and hardened to mechanically protect it from the acceleration and centrifugal force that act on each circuit element. Furthermore, this transmitter circuit is made of an aluminum cylindrical case 3 with a flange on one side.
Insert and secure in C. In order to coaxially insert and arrange the cylindrical case 3C into the inner diameter portion of the hollow cylindrical portion 10, a hole having an inner diameter larger than the inner diameter D of the measurement cylindrical portion 10 is formed on the surface of the flange 12 that is coupled to the shaft DS of the dynamometer. 12G coaxially and its bottom surface 1
Align the flange surface of the cylindrical case 3C with 2B and integrally tighten and connect them with small bolts bT. Also,
In order to protect the transmitting circuit from oil, water, dust, etc., the case 3C is sealed with an annular rubber packing RP, and an iron lid 3P is tightened and connected with a small bolt bT. Further, the outer diameter of the cylindrical portion of the case 3C is smaller than the inner diameter D of the measurement cylindrical portion 10.
A gap W is formed so that C and the inner surface of the measurement cylindrical portion 10 do not come into contact with each other. The power input terminal of the transmitting circuit is connected to the first coil 41 constituting the transmitting/receiving means by a lead wire _l2 passing through the second hole 12H provided in the flange 12. The first coil 41 is
Flange 1 arranged at the right end of the measurement cylinder part 10 in the figure
The open end of an annular holder 4H made of an insulating material and having a predetermined width is fixed to the flange 12 by a predetermined distance away from the flange 12. The first coil 41 is arranged and fixed to the L-shaped stepped portion 4S, with the annular holder 4H having an L-shaped cross section. Furthermore, in the first embodiment, the first coil 41 also serves as a transmitting antenna, and is also connected to the signal output end of the transmitting circuit. A second coil 42 constituting the transmitting/receiving means is disposed near the first coil 41 by an insulating holder 45 supported by supporting means 40, which will be described later, and is connected to a power source for the sensor and transmitting circuit. Electric power is supplied to the first coil 41 in a non-contact manner by magnetic coupling, and a transmission signal transmitted from the first coil 41, which also serves as a transmission antenna, is received in a non-contact manner as a reception antenna.

The support means 40 will be explained using FIG. 2. The support means 40 is composed of three elements, and has a fixing base 43 as a stationary part with an oblong hole 4L provided in the leg part to be fixed to an appropriate location on the surface plate. Second, a semicircular lower coil holder 44 is provided which firmly supports the lower coil 42L of the second coil 42, which is inserted into the oval hole 4L with a screw 4B, adjusted to a predetermined height, and fastened and fixed. have thirdly, coupled to the lower coil holder 44;
It also includes a semicircular upper coil holder 45 that firmly supports the upper coil 42U of the second coil 42. The lower coil holder 44 and the upper coil holder 45 are connected by contact portions 4CU and 4CL protruding from the semicircular ends.

The two-divided upper coil 42U and lower coil 42L are connected to each other by a copper plate contactor 4PU, which is fixed to the contact portions 4CU and 4CL of the lower and upper coil holders, which are connected by soldering to their respective ends.
4PL were brought into surface contact, and the contact portions 4CU and 4CL were integrally tightened together and electrically connected.

Further, the lower coil holder 44 and the upper coil holder 45 both have grooves 4GU and 4GL having a diameter approximately equal to the outer diameter of the lower coil 42L and the upper coil 42U and a depth approximately equal to the coil wire diameter.
and coils 42U, 4 in the grooves 4GU, 4GL.
2L was fixed, and the outer circumferences of both coils were surrounded by lower and upper holders 44 and 45 made of insulators. In the first embodiment, the second coil 42 also serves as a receiving antenna for receiving the distortion signal acting on the torque of the rotating body. The second coil 42 is connected to a power output terminal of a reception calculation circuit V, which will be described later, via a cable 42C.

Next, a telemeter device for transmitting torque signals detected by the strain gauges 2A and 2D from a rotating transmitter to a non-rotating receiver will be described with reference to FIG. The telemeter device of the first embodiment rectifies AC voltage to use it as a power supply voltage,
and a transmitting circuit that performs pulse frequency conversion on the detected torque signal and converts the detected torque signal into a high frequency signal that further frequency modulates the high frequency signal, and a transmitting/receiving means that transmits and receives this as a radio wave and simultaneously transmits and receives an alternating voltage. and a reception calculation circuit that demodulates the original torque signal from the received high-frequency signal and generates an alternating current voltage.

The transmitting circuit includes a first modulator 31, a second modulator 32, and a power supply circuit 33. The symbol is a sensor.

The first modulator 31 includes resistors 121, 122, 1
23, 124 and an ordinary operational amplifier (hereinafter referred to as an operational amplifier) 125. Moreover, the modulator 31 has a resistor 1
An integrator 3 comprising a resistor 126, a capacitor 128, and an operational amplifier 127 receives a predetermined voltage generated by a resistor 135 and a constant voltage diode 136 via a resistor 134, and uses this as a reference potential.
Has 1. It further includes a comparator 31C for comparing the output of the integrator with the reference potential, and a switch circuit 31S consisting of a transistor 133, a resistor 132, and a capacitor 131, which becomes conductive when the comparator turns positive. It consists of The first modulator 31 is connected to the strain gauge 2
It is connected via a signal input terminal 120 to a sensor constituting the bridge circuit 20 made up of A to 2D, inputs a torque signal, and performs pulse frequency modulation in which the pulse repetition frequency changes in response to the torque signal.

The pulse frequency modulated output of the first modulator 31 is connected to a frequency modulation input terminal of the second modulator 32 . The second modulator 32 is connected to the capacitor 1
50 is the input terminal, and resistors 151, 152, 15
3,159, capacitor 154, 156, 15
8, a modified Colpittz-type high-frequency oscillator 32H consisting of a coil 157 and a transistor 155.
and resistors 160, 162, transistor 161,
and an emitter follower 32E consisting of a high frequency output capacitor 163. This results in
The pulse frequency modulated signal corresponding to the torque signal frequency modulates the high frequency. That is,
PFM-FM modulation (FM: frequency modulation) is performed. The output of the second modulator 32 is the capacitor 16
3 to the power input terminal 190. A power input terminal 190 is connected to the first coil 41.

The power supply circuit 33 includes a transformer 182 which is connected to the input terminal 190 and has a primary winding in which coils 180 and 181 are connected in series to block high frequencies, and a transformer 182 which has two secondary windings in series, and a transformer 182 which rectifies both waves and transforms the positive and A double-wave rectifier 183 that obtains negative direct current, capacitors 184 and 185 that smooth positive and negative currents, constant voltage elements 186 and 187 composed of ICs that always output predetermined positive and negative voltages, and bypass capacitors 188 and 189 It consists of: The output of the power supply circuit 33 is connected to the sensor and the first modulator 3.
It is connected to the power supply terminals of the first and second modulators 32 and supplies necessary power.

The transmitting/receiving means is the first coil 41 as described above.
and a second coil 42, both coils 4
1 and 42 are electromagnetically coupled to each other. The first coil 41 connects the second coil to the power input terminal 190.
The coils 42 are connected to power output terminals 550, respectively. Further, the first coil 41 also serves as a transmitting antenna for transmitting a high frequency wave, which is a distortion signal corresponding to the torque output from the transmitting circuit, as a radio wave. Furthermore, the second coil 42 is electromagnetically coupled to the first coil 41 and also serves as a receiving antenna for receiving the radio waves. In the first embodiment, a transmitter is configured by the above-described transmitting circuit and the first coil 41 which also serves as a transmitting antenna.

The reception calculation circuit includes a tuning circuit 51, an intermediate frequency circuit 52, a detection circuit 53, a demodulation circuit 54,
It is composed of a power generation circuit 55 and a frequency tracking circuit 56. The second coil 42, which also serves as a radio wave receiving antenna of the transmitting/receiving means, is connected to a power output terminal 550 of the receiving calculation circuit.

The tuning circuit 51 connects the second coil 4
It is a device that tunes and selects the radio waves received by 2.
Capacitor 2 connected to the power output terminal 550
10, a tuning control circuit 212 for controlling the frequency to be tuned, and an ordinary electronic tuner 211. The tuning control circuit 212 includes a potentiometer 212a that outputs a negative voltage, and a resistor 212.
b, 212c, 212d and operational amplifier 212
It consists of an inverting adder consisting of e. One input resistor 212b of the adder is a potentiometer 21
Connect to 2a. Connection of the other input resistor 212c will be described later. Further, the electronic tuner 211 is operated by a positive voltage, and has a frequency control terminal 211c whose tuning frequency increases as the voltage increases.

Output terminal 21 of electronic tuner 211 that outputs a signal obtained by converting a tuned high frequency signal to an intermediate frequency
1b is input capacitor 250, bias resistor 2
51, 253, 254, a load resistor 256, a bypass capacitor 255, a transistor 252, and a ceramic intermediate frequency filter 257. The intermediate frequency circuit 52
is connected to the detection circuit 53 and outputs a filtered intermediate frequency signal.

The detection circuit 53 includes a resistor 258 and a capacitor 25.
9,261, a coil 262, and a normal FM detection IC 260, when the intermediate frequency deviates from the center frequency of the intermediate frequency in a direction larger than the center frequency of the intermediate frequency, it becomes positive.
Output point 2 outputs a negative voltage when the deviation is in the small direction.
71. By this operation, the frequency of the pulse frequency modulated signal is detected.

The demodulation circuit 54 is connected to the output point 271 of the detection circuit 53.
is connected to an operational amplifier 310, a comparator consisting of resistors 311 and 312 that generate a comparison voltage, and a monostable multivibrator IC 3.
13. A monostable multivibrator consisting of a capacitor 315 that determines the pulse width and a resistor 314, and a resistor 316 and capacitor 3 that average the output pulses of the monostable multivibrator.
17, and an averaging circuit consisting of an operational amplifier 318. The demodulation circuit 54 demodulates the pulse frequency modulated signal of the detection circuit 53 into a distorted signal corresponding to the original torque signal, and outputs the distorted signal to the output terminal 350.

The frequency demodulation circuit 56 is connected to the output terminal 271 of the detection circuit 53, and includes a resistor 411, a capacitor 413, a switch 412, and an operational amplifier 41.
When the switch 412 is "closed", the voltage at the output terminal 271 is zero, and when the switch 412 is "open", the voltage at the output terminal 271 is integrated with negative polarity, and the output is used for the tuning control of the tuning circuit 51. circuit 21
It is output to one input resistor 212C of the adder No. 2.

The power generation circuit 55 includes capacitors 510, 513, 516 and resistors 511, 51 that determine the frequency.
2,515, a resistor 518 that determines the voltage, a constant voltage diode 519, and an operational amplifier 514, 51
7, a potentiometer 520 for voltage adjustment, and a Darlington transistor 5 forming a complementary emitter follower.
It consists of a power amplifier consisting of 21,522, a DC blocking capacitor 523, and a high frequency blocking coil 524, the output of which is connected to a power supply output terminal 550. The power generation circuit 55 supplies power necessary to drive the sensor arranged on the rotating body and the transmission circuit to the magnetically coupled first coil 41 via the second coil 42 without contact. do.

The functions and effects of the first embodiment will be explained below. Torque applied by the propeller shaft PS is transmitted from the flange 11 fastened by bolts BT to the flange 12 through the measurement cylinder part 10. The flange 12 is fastened to the dynamometer shaft DS by bolts BT, and said torque is applied to the dynamometer. At this time, a torsional force acts on the measurement cylinder part 10, and the strain gauges 2A to 2
The sensor D detects this torque as a distortion amount signal. In this manner, the device of the first embodiment can detect torque without requiring a bearing by connecting the shafts at both ends with the flanges 11 and 12. Therefore, the torque measurement according to the first embodiment has the great advantage that it does not require a time-consuming axis alignment operation and can be installed in a short time. In addition, since the measurement hollow cylinder does not have a bearing, even if the dynamometer shaft is displaced, it will not cause a malfunction, and it can be applied to dynamometers that actively float the shaft for lubrication. . Furthermore, since it does not have bearings that limit rotation speed, it can be applied to any engine or any dynamometer. Since the structure does not require bearings, the axial length can be shorter than conventional torque measuring devices that require bearings, and the deterioration of engine test bench usage efficiency and workability due to installation can be suppressed. can.

The reason why the thick portions 13 and 14 having a thickness T are provided at the connection portions between the flanges 11 and 12 at both ends of the measurement hollow cylinder I and the cylindrical portion 10 as described above will be described below. Generally, when a bending moment is applied to a hollow, thin-walled cylinder, a so-called cross-sectional distortion phenomenon occurs in which a circular cross section deforms into an oval shape. When cross-sectional distortion occurs, the relationship between the amount of strain on the same circumference of the cylinder becomes uneven, and the bending moment component is mixed into the torque signal for torsional force as an error. In order to minimize the amount of strain and maintain the amount of strain, that is, the sensitivity to the torsional force, thick portions 13 and 14 are provided in this embodiment for the purpose of increasing the rigidity at both ends of the thin-walled cylinder. The reason why the thickness T of the thick portions 13 and 14 is approximately one-tenth of the inner diameter D of the measuring cylindrical portion 10 is that T≧(1/
10) By setting D, the mechanical behavior of the thick-walled portions 13 and 14 can be made to have the characteristics of a thick-walled cylinder. Furthermore, the thin part (measuring cylindrical part 10)
By making the length in the axial direction of 4 (T-t) or more, which is four times the difference between the thickness T of the thick parts 13 and 14 and the thickness t of the thin part, the center of the thin part, i.e. At a position 2 (T-t) or more away from any of the thick parts 13, 14, the effect of stress concentration occurring near the thick parts 13, 14, and the flange 1
The measurement cylindrical part 1 is made thin so as not to be affected by the stress concentration that occurs near the tightening bolts BT 1 and 12.
This is because the stress at the zero center can be brought closer to the theoretical value. This is an application of the Saint-Venant principle. For this reason, as mentioned above, from the thick parts 13 and 14
Strain gauge 2 attached at a distance of (T-t) or more
A to 2C are sensitive only to the torsional force, that is, the torque component, and eliminate the influence of errors due to components such as bending moment, thereby enabling highly accurate measurement. Furthermore, the thick portions 13 and 14 and the flange 1
By providing connecting portions 13B, 14B, 13C, and 14C each having an arcuate cross section at the boundary between the thick wall portions 13 and 14 and the thin measurement cylindrical portion 10, the flanges 11 and 12 and the thickness Meat part 13,1
4, thick walled portions 13 and 14, and thin measuring cylindrical portion 1
This prevents sudden changes in the stress at the boundaries where the thicknesses are different, such as 0, and protects the measurement hollow cylinder from the risk of fatigue failure. The structure described above makes it possible to detect torque accurately, easily, and with good durability without the need for bearings.

Now, we will continue to explain the functions and effects of the telemeter part. The power generation circuit 55 of the reception arithmetic circuit shown in FIG. 3 outputs a sine wave voltage from a power output terminal 550, and supplies it to the second coil 42 of the transmitting/receiving means. The second coil 42 generates an alternating magnetic field, causing the electromagnetically coupled first coil 41 to supply an alternating voltage. The first coil 41 is fixed to the flange 12, and the first coil 41 is fixed to the flange 12.
rotates with. That is, a voltage serving as a power source is supplied from the fixed part to the rotating part in a non-contact manner.

The power supply circuit 33 of the transmitting circuit has a power supply input terminal 1
The AC voltage of the first coil 41 is input from 90 . The AC voltage is converted into a predetermined AC voltage by a transformer 182, and then passed through a double-wave rectifier diode 183.
becomes direct current, and the constant voltage elements 186 and 187 supply positive and negative predetermined voltages to the first modulator 31, second modulator 32, and strain gauge 2, respectively.
The signal is supplied to sensors consisting of bridge circuits 20 A to 2C.

The first modulator 31 amplifies the torque signal output from the sensor from the signal input terminal 120 to a predetermined voltage, and generates a pulse frequency signal corresponding to the voltage. That is, pulse frequency modulation is performed.

The second modulator 32 inputs the pulse frequency modulated signal and performs frequency modulation by shifting the high frequency in a pulse manner with the center frequency being a predetermined frequency of the modified Colpitts oscillator. The output of the second modulator 32 is connected to the power input terminal 190 through the high-frequency output capacitor 163, and is transmitted as a radio wave to the second coil 42 using the first coil 41 as a transmitting antenna.

The input side of the power supply circuit 33, that is, the transformer 1
The primary winding of 82 includes a high frequency blocking coil 180,
181 are inserted in series, the high frequency output of the second modulator 32 connected to the power supply input terminal 190 is prevented from flowing into the power supply circuit 33, and is efficiently supplied to the first coil 41. .

The second coil 42 of the transmitting/receiving means also serves as a receiving antenna as described above, and the second coil 42 serves as a receiving antenna as described above.
2 through the first coil 41, and connects it to the capacitor 210 on the input side of the tuning circuit 51 through the power output terminal 550.
Connect to. The output side of the power generation circuit 55 described above is connected to the power output terminal 550, and since there is a high frequency blocking coil 524, the received high frequency does not flow into the power generation circuit 55 and is input to the tuning circuit 51. In addition, the input capacitor 210 of the tuning circuit 51 has a low impedance for the received high frequency, so it passes the high frequency efficiently, but it has a high impedance for the AC voltage output of the power generation circuit 55. This prevents troubles such as the alternating current voltage flowing into the tuning circuit 51.

Now, the tuning circuit 51 controls the electronic tuner 2 by a predetermined voltage of the frequency control terminal 211C.
11 is tuned to the high frequency signal and converted into an intermediate frequency signal. The voltage of the frequency control terminal 211C is the voltage of the potentiometer 212 of the tuning control circuit 212.
a and the output voltage of the frequency tracking circuit 56. Initially, by keeping the switch 412 in the "closed" state, the integrating operation of the frequency tracking circuit 56 is stopped, and the potentiometer 212a
Tuning is performed by setting the voltage to a predetermined value. An intermediate frequency circuit 52 connected to the tuning circuit 51 selectively amplifies only the intermediate frequency signal and connects it to the input of a detection circuit 53. The frequency of this intermediate frequency signal increases as the received high frequency signal shifts toward the higher side, and decreases when the high frequency signal shifts toward the lower side. The detection circuit 53 has a characteristic of outputting a positive voltage when the frequency of the intermediate frequency signal becomes high, and outputting a negative voltage when the frequency becomes low. Therefore, by frequency-detecting the frequency-modulated high-frequency signal that is the output of the second modulator 32 of the transmitting circuit, a distortion signal corresponding to the applied torque that is the output of the first modulator 31 is detected. Regenerate pulse frequency signals. This pulse frequency signal includes the torque signal as described above.

The demodulation circuit 54 demodulates the distortion signal corresponding to the torque by averaging the output of the multivibrator 313 that outputs a constant pulse width in response to the pulse frequency signal, and outputs the distortion signal to the output terminal 350.
Output to.

Through the telemeter operation described above, the torque signal detected from the torsional force of the rotating measurement cylinder section 10 is measured in a non-contact manner by the receiving calculation circuit on the stationary side.

Next, the function and effect of the frequency tracking circuit 56 will be explained. When the center frequency of the high-frequency signal of the second modulator 32 of the transmitting circuit changes due to changes over time or temperature, the average voltage at the zero point, which is the reference potential of the output terminal 271 of the detection circuit 53 in the receiving arithmetic circuit, changes. That is, as described above, the detection circuit 53 outputs a positive voltage when the center frequency of the high-frequency signal changes to a higher side, and outputs a negative voltage when it changes to a lower side. For example, if the center frequency of the high frequency changes to a higher side, the output terminal 271
generates a positive voltage. Frequency tracking circuit 5
6 integrates the voltage at the output terminal 271 by opening the switch 412. Through this integration, the frequency tracking circuit 56 gradually increases the negative voltage.
It is output to the tuning control circuit 212. As mentioned above, since the potentiometer 212a also outputs a negative voltage, the tuning control circuit 212 has a positive polarity, and the output of the frequency tracking circuit 56 and the potentiometer 21
The voltage of the sum of the output of 2a and the output of frequency control terminal 211
Output to C. This voltage changes the tuning frequency of the electronic tuner 211 to a higher side, so that it follows the center frequency of the above-mentioned high frequency signal and matches the tuning frequency. If the center frequency of the high-frequency signal and the tuning frequency match, the average voltage output from the detection circuit 53 returns to the original reference voltage, which is the zero point, and the frequency tracking circuit 5
6 stops increasing the output voltage. Such a servo operation works, and it is possible to follow the high frequency signal and perform accurate tuning. This frequency tracking operation is performed based on the same principle even when the high frequency signal changes to a lower level, and accurate tuning can always be achieved.

By following the frequency of the high-frequency signal of the transmitting circuit and keeping the telemeter device in accurate tuning, it is possible to maintain the best reception condition at all times, avoiding the contamination of external noise and ensuring long-term operation. In addition to making accurate measurements possible over time, time-consuming tasks such as checking the tuning state or re-tuning can be omitted, making it possible to perform efficient measurements.

Next, the merits of incorporating the transmitting circuit within the measurement hollow cylinder will be explained. As described above, the transmitting circuit is inserted into the cylindrical case 3C, and the case is attached to the measurement cylinder part 10 at the flange 12.
By attaching it to the bottom surface 12B of a hole having a diameter larger than the inner diameter of the transmission circuit, centrifugal acceleration due to rotation applied to the transmission circuit can be minimized. That is, as mentioned above, centrifugal force is the product of rotational speed and radius. Therefore, coaxially inserting the transmitter circuit into the measurement hollow cylinder can minimize the centrifugal force applied to the transmitter circuit. With this arrangement, it is possible to increase the rotational speed at which electronic components and circuits can generate an acceptable centrifugal force.
The range of torque measurement can be expanded. In addition, by tightening and connecting the case 3C of the transmitting circuit with the bottom surface 12B, stress other than the torque signal exerted on the measurement cylindrical portion 10 can be minimized. That is, the flanges 11 and 12 are thick and have the highest rigidity, and since the transmitting circuit is coaxially arranged, the centrifugal force exerted on the flanges 11 and 12 by the transmitting circuit and case 3C is can be reduced to almost zero. Further, as mentioned above, the outer diameter of the cylindrical portion of the case 3C is smaller than the inner diameter of the measuring cylindrical portion 10, and the clearance W is ensured, so that even during rotation, the cylindrical case 3C exerts a force on the inner surface of the cylinder. Therefore, no errors are mixed into the torque signal to be measured. The reason why the transmitting circuit is inserted into the permalloy box 3B and covered with an iron lid 3P is to protect it from electromagnetic noise, and is effective in eliminating noise caused by external disturbances.Furthermore, the transmitting circuit is inserted into the measurement hollow cylinder made of metal. We are taking double and triple noise countermeasures.

Next, the annular holder 4H holding the first coil 41 separates the first coil 41 from the surface of the flange 12 by a predetermined distance, thereby increasing the magnetic flux of the magnetic field generated by the second coil 42. This is to achieve efficient interlinking and to reduce interlinking of the magnetic field with the flange 12. The fact that the first coil 41 interlinks with the magnetic flux of the second coil 42 with high efficiency is effective for generating an alternating current voltage in the first coil 41, and on the contrary, the flange 1
This is because interlinking the magnetic flux with the power generation circuit 55 wastes the power of the power generation circuit 55.

Next, the effects of the supporting means 40 for the second coil 42 in the transmitting and receiving means will be explained.

As described above regarding the electrical operation of the telemeter device, the second coil 42 for supplying power to the transmitting circuit and receiving radio waves from the transmitting circuit is wound and rotated around the measurement hollow cylinder. It is necessary to arrange it close to the first coil 41. This second coil 42 is divided into two parts, and a lower coil 42L and an upper coil 42U are attached to a lower coil holder 44 and an upper coil holder 4, respectively.
It was fixed and held at 5. By tightening the lower coil holder 44 and the upper coil holder 45 through the contact parts 4CU and 4CL and electrically connecting them through the contacts 4PU and 4PL, the lower coil 42L and the upper coil 42U are simultaneously integrated. The second coil 42 can be easily assembled. Furthermore, the adjustment screw 4 passes through the lower coil holder 44 into the oblong hole 4L.
B, the measurer comes into contact with the first coil 41 or the measurement hollow cylinder, which is rotated by vibration, external force, etc., by a mechanism that is firmly held at a predetermined height on a fixed base 43 fixed to a surface plate. It has the great advantage of preventing accidents, operating stably, and making installation extremely easy. Further, the supporting means 40 which is an insulating material covers the second coil 42 to which an alternating current voltage is applied through the groove 4GL, and the second coil 42 is placed on the side of the first coil 41.
The second coil 42 is surrounded by the insulator of the support means 40 and the flange 12 in order to securely and closely oppose the second coil 42 . This structure has the effect of preventing an accident in which a worker accidentally touches the second coil 42 and receives an electric shock.

The transmitting/receiving means having such a structure enables stable telemeter operation, extremely simple installation work, and safe measurement.

"Second Embodiment" The rotating body torque measuring device of the second embodiment differs from the first embodiment only in the second coil of the transmitting/receiving means. The differences will be mainly explained using Fig. 4.

The second coil 47 has a winding 47C wound around a circular magnetic core 47K having one end open. The second coil 47 is supported by support means 48 . By inserting and fixing the magnetic core 47K of the second coil 47 into a hole 48H with a concave cross section provided in a rectangular holder 48A made of an insulating material, the second coil 47 is surrounded by the rectangular holder 48A, and the magnetic core 47K is Electromagnetic coupling is achieved by arranging the magnetic flux of the opening in a positional relationship that interlinks with the annular first coil 41. The holder 48A is adjusted to a predetermined height using a screw 48T inserted into an oblong hole 48L provided in the holder 48A, and then tightened and connected. As described above, the device of the second embodiment can easily connect the second coil 47 and the first coil without going around the supporting means 45 and 44 as in the case of the device of the first embodiment.
The coil 41 can be electromagnetically coupled.

"Effects" As stated above, the device of the present invention has the above configuration, and the connecting part between the flanges at both ends and the measuring cylindrical part has a wall thickness that is one-tenth or more of the inner diameter of the measuring cylindrical part. The outer wall of the measurement cylindrical part is formed with a thick wall part, and the sensor is located at a distance of at least twice the difference between the thickness of the thick part and the thickness of the measurement cylindrical part from the center-side end of the thick part to the center. Since it is fixed on the top, when torque is applied to the measuring cylinder during measurement, even if stress is concentrated at the connection between the flange and the measuring cylinder, the thick wall part alleviates the stress and improves the accuracy of the sensor. In addition to solving problems related to deformation and strength, even when a bending moment is applied to the measurement cylinder, the rigidity of the thick wall part prevents the sensor part from being affected by cross-sectional deformation, etc. A signal corresponding to torque can be detected accurately. In addition, by keeping the sensor a certain distance away from the thick part, even if stress concentration occurs at the connection between the flange part and the measurement cylinder part during measurement, the effect of that stress state will not be exerted on the sensor, making it possible to improve accuracy. It has excellent effects such as being able to measure high torque.

[Brief explanation of the drawing]

FIG. 1 is a sectional view showing the first embodiment of the present invention;
FIG. 2 is a perspective view showing the structure of the support means, FIG. 3 is an electric circuit diagram, and FIG. 4 is a sectional view showing the second embodiment. 3C...Case, 10...Measuring cylinder part, 11,
12...Flange, 13, 14...Thick wall part, 40
...Supporting means, 41...First coil, 42,4
7... Second coil, 47K... Core, 48...
Supporting means, 56...Frequency tracking circuit, I...Measuring hollow cylinder,...Sensor,...Transmission circuit,...
...transmission/reception means, ...reception calculation circuit.

Claims (1)

[Scope of claim for utility model registration] (1) A measuring hollow cylinder having flanges at both ends for fixing the measuring cylinder to a rotating body whose torque is to be measured, and a physical quantity corresponding to the torque acting on the measuring hollow cylinder. a transmitting circuit fixedly disposed within the inner diameter of one end of the measuring hollow cylinder and converting a signal outputted by the sensor into a transmitted signal; a transmitting circuit configured to receive the signal transmitted by the transmitting circuit, In a rotating body torque measuring device comprising a reception calculation circuit that calculates the torque acting on the rotating body based on a signal output by a sensor, the connecting part between the flanges at both ends of the measurement hollow cylinder and the measurement cylinder part, 10 of the inner diameter of the measurement cylinder
forming a thick part having a wall thickness of 1/2 or more, and placing the sensor at a distance of at least twice the difference between the thickness of the thick part and the thickness of the measuring cylindrical part from an end near the center of the thick part. A lead wire is arranged and fixed on the outer wall of the measuring cylindrical part from the position to the center, and a lead wire connecting the sensor and the transmitting circuit is fixed to the outer wall of the measuring cylindrical part, and the lead wire is transmitted through a hole in the flange. A rotating body torque measuring device characterized in that it is connected to a circuit. (2) The transmitting circuit is inserted into a case made of a magnetic material, and the case is coaxially arranged and fixed to the inner diameter part of the hollow measurement cylinder. The rotating body torque measuring device described in (1). (3) a first coil arranged annularly along the flange portion of the one end and connected to the transmission circuit;
A transmitting/receiving means is provided, the second coil being closely opposed to the first coil and supplying power for driving the sensor and the transmitting circuit through magnetic coupling, and the second coil is connected to the first coil. The utility model described in claim (1) is characterized in that the utility model is composed of coils formed in corresponding annular shapes, and is supported by supporting means so that the first and second coils face each other over the entire circumference of the coils. Rotating body torque measuring device. (4) The second coil is constructed by winding a coil around a substantially U-shaped magnetic core,
The rotating body torque measuring device according to claim (1), which is a registered utility model, characterized in that the rotating body torque measuring device is disposed adjacent to and corresponding to a predetermined portion of the annular first coil. (5) Utility model registration claim (3) characterized in that the supporting means and the second coil supported by the supporting means have a split structure so that they can be attached and detached.
The rotating body torque measuring device described in Section 1. (6) The reception calculation circuit detects the reception frequency,
Claim for utility model registration characterized by comprising a frequency tracking circuit that changes and tunes the tuning frequency in response to changes in the center frequency of the transmitter circuit by detecting changes in the center frequency of the transmitter circuit. A rotating body torque measuring device according to scope (1).