JP2007327890A - Torque measuring device of rotating body - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To accurately measure dynamic torque generated on a transmission shaft rotating at a high speed by having no need of supplying a power source from a fixed body side, and enabling torque measurement even in a state of stopping rotation as a rotating body is proper during rotation. <P>SOLUTION: A drive shaft 1 and a load shaft 2 are integrated by connecting flange parts 1b and 2b by tightening screws. A plurality of permanent magnets 13 are held by a magnet fixed plate 14 fixed on a casing member 6. The same number of coils 17 is fixed and held on the flange parts 1b and 2b by facing the permanent magnet 13. A current is made to flow in the coils 17 by electromagnetic induction by rotating the coils 17 to be charged to a battery 24 after prescribed processing is performed on the current to be stabilized. A plurality of strain gages SG1 and SG2 are added so as to detect shearing strain in a strain part 2e of the load shaft 2. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a torque measuring device, and more specifically, a torque measuring device for a rotating body that is interposed between a drive shaft side and a load shaft side in a rotational force transmission system and measures torque transmitted between both shafts. It is about.

As a conventional torque converter, for example, one of the type described in Patent Document 1 (Japanese Patent Publication No. 60-46372) has been often used.
That is, the torque converter described in Patent Document 1 is 180 ° in the circumferential direction on the outer peripheral surface of the strain generating portion formed in a small diameter between the rotating shaft on the prime mover side and the rotating shaft on the load side. Inclined by approximately 45 ° with respect to the axial direction of the strain-generating portion at spaced apart positions, the two compression-side strain gauges have sensitivity in different directions by 90 ° with respect to the two tensile-side strain gauges, respectively. Thus, each strain gauge exhibits a resistance value corresponding to a tensile force and a compressive force generated in a direction of 90 ° with respect to the tensile force. An electrical signal corresponding to the torque is obtained from a bridge circuit in which a plurality of compression-side strain gauges and a plurality of tension-side strain gauges attached in this manner are inserted into adjacent sides.

Then, the bridge power is supplied from the casing (fixed side) to the input end of the bridge circuit on the strain generating portion (rotating side), or the torque detection signal output from the bridge circuit is transmitted from the strain generating portion side to the casing side. As a means, a so-called direct contact type transmission means for transmitting to the connector via four slip rings arranged in parallel to the strain generating portion and four brushes provided on the casing is used.
On the other hand, a torque measuring device that transmits a torque detection signal in a non-contact manner from the rotating side to the stationary side has been proposed in, for example, Japanese Patent Application Laid-Open No. 11-160171.
That is, the torque measuring device (referred to as an electric dynamometer in the name of the invention) according to this Patent Document 2 is a tubular part by a strain gauge attached to a tubular part fixed to a rotating shaft of an electric motor or a generator. The detection signal is transmitted to the torque meter body provided on the outer periphery of the bearing section via the rotating side coil and stationary side coil of the rotary transformer, and further via the signal line connected to the connector. Output to the outside.

Japanese Patent Publication No. 60-46732 JP-A-11-160171

However, since the torque converter according to Patent Document 1 described in the background art transmits a torque detection signal obtained by a strain gauge by a direct contact method using a slip ring, a brush sliding in a signal transmission system. In addition to the problem that dynamic noise is mixed and the measurement accuracy is adversely affected, the slip ring has a contact structure, so the life of the brush is short and maintenance is required. Thousand r. p. There was an inconvenience that the measurement was limited to m.
On the other hand, since the electric dynamometer according to Patent Document 2 described in the background art is a method of transmitting a torque detection signal from the rotating body side to the stationary body side in a non-contact manner, the above-described problem of contact noise is avoided. Since the detection signal detected by the strain gauge is transmitted to the fixed side by the rotary transformer, there is a restriction that a power supply (for example, a 100V commercial power supply) supplied to the rotary transformer is required.

The present invention has been made in view of the above-described problems, and a first object of the present invention is to provide a torque measuring device for a rotating body that does not need to supply power from the fixed side.
The second object is to provide a torque measuring device for a rotating body that can accurately measure the torque applied between the drive shaft side and the load shaft side even when the rotating body is stationary. In particular,
A third object is to provide a torque measuring device for a rotating body that is difficult to introduce unnecessary noise in the transmission and reception of power and signals between the rotating body side and the stationary body side.
A fourth object is to provide a torque measuring device for a rotating body capable of measuring dynamic torque generated in a transmission shaft rotating at high speed.

A torque measuring device for a rotating body according to the invention described in claim 1 is:
In order to achieve the above first to fourth objects,
In a torque measuring device for a rotating body that is interposed between a drive shaft side and a load shaft side in a rotational force transmission system and measures torque transmitted between both shafts,
A power generation mechanism that is disposed between the fixed body and the rotating body and generates electric power with the rotation of the rotating body;
A rechargeable battery that is disposed on the rotating body side and stores electric power generated by the power generation mechanism;
Torque detecting means for detecting torque applied to the load shaft and outputting a detection signal;
A signal processing circuit for performing amplification, signal conversion and the like on the detection signal output from the torque detection means;
Transmission means for transmitting the output signal from the signal processing circuit to the stationary body without contact,
The torque detection unit, the signal processing circuit, and the transmission unit are configured to be able to supply power from the power generation mechanism or the rechargeable battery.

The torque measuring device for a rotating body according to the invention described in claim 2 is:
In order to achieve the above first to fourth objects,
The power generation mechanism includes a plurality of permanent magnets disposed on a casing member constituting the fixed body or a member integral with the casing member, and the drive shaft or the load shaft constituting a part of the rotating body. And a plurality of coils disposed on the flange portion.
The torque measuring device for a rotating body according to the invention described in claim 3 is:
In order to achieve the above first to fourth objects,
The plurality of permanent magnets are disposed on the casing member at equiangular intervals on a first virtual circle centered on the drive shaft, and the plurality of coils are centered on the drive shaft. A plurality of flanges are disposed at equal angular intervals on a second virtual circle having the same radius as the virtual circle, and the coils and the permanent magnets face each other with a predetermined gap. It is characterized by having been arranged in.

The torque measuring device for a rotating body according to the invention described in claim 4 is:
In order to achieve the above first to fourth objects,
The rechargeable battery is configured to be loaded into a rechargeable battery housing hole formed along the center of the drive shaft and / or the load shaft.
The torque measuring device for a rotating body according to the invention described in claim 5 is:
In order to achieve the above first to fourth objects,
The load shaft is provided with a circuit component storage case portion for storing circuit components such as the signal processing circuit and the transmission means.
The torque measuring device for a rotating body according to the invention described in claim 6 is:
In order to achieve the above first to fourth objects,
The torque detection means, the signal processing means, and the transmission means can detect the torque at the time of stopping applied to the load shaft by receiving power from the rechargeable battery even when the drive shaft is stopped. It is characterized by being configured.

A torque measuring device for a rotating body according to the invention described in claim 7 is:
In order to achieve the above first to fourth objects,
The torque detecting means comprises a plurality of strain gauges attached at an angular interval of 180 ° on a strain generating portion having a small diameter of the load shaft, and detects a shear strain generated in the strain generating portion. It is characterized by being configured to obtain.
The torque measuring device for a rotating body according to the invention described in claim 8 is:
In order to achieve the first to sixth objects described above,
The drive shaft and the load shaft are joined by a screw coupling means in a state where a pair of flange portions formed at respective end portions are in contact with each other so as to match the shaft center. .

According to the first aspect of the present invention, in the torque measuring device for a rotating body that is interposed between the drive shaft side and the load shaft side in the rotational force transmission system and measures torque transmitted between both shafts. ,
A power generation mechanism that is disposed between the fixed body and the rotating body and generates electric power with the rotation of the rotating body;
A rechargeable battery that is disposed on the rotating body side and stores electric power generated by the power generation mechanism;
Torque detecting means for detecting torque applied to the load shaft and outputting a detection signal;
A signal processing circuit for performing amplification, signal conversion and the like on the detection signal output from the torque detection means;
Transmission means for transmitting the output signal from the signal processing circuit to the stationary body without contact,
Since the electric power can be supplied from the power generation mechanism or the rechargeable battery to the torque detection means, the signal processing circuit, and the transmission means, the following effects can be obtained.

First, torque measurement of a rotating body that can generate and charge power as a power source without using an external power source, a slip ring / brush that transmits power from the power source, an oscillator, and a rotating transformer. An apparatus can be provided.
Second, it is possible to provide a torque measuring device for a rotating body that can accurately measure the torque applied between the drive shaft side and the load shaft side even when the rotating body stops rotating. it can.
Thirdly, it is possible to provide a torque measuring device for a rotating body in which unnecessary noise is hardly mixed in the transmission and reception of electric power and signals between the rotating body side and the stationary body side.
Fourthly, it is possible to provide a torque measuring device for a rotating body that can withstand high-speed rotation and detect dynamic torque of a transmission shaft during high-speed rotation.
According to a second aspect of the present invention, the power generation mechanism includes a plurality of permanent magnets disposed on a casing member constituting the fixed body or a member integral therewith, and one of the rotating bodies. And a plurality of coils disposed on the flange portion of the drive shaft or the load shaft constituting the portion, it is possible to provide a torque measuring device for a rotating body that exhibits the above effects with a simple configuration.

According to a third aspect of the present invention, a plurality of the plurality of permanent magnets are disposed on the casing member at equiangular intervals on a first virtual circle centered on the drive shaft, A plurality of the coils are disposed on the flange portion at equal angular intervals on a second virtual circle having the same radius as the virtual circle centered on the drive shaft, and each coil and each permanent Since the magnets are arranged so as to confront each other with a predetermined gap, a torque measuring device for a rotating body that can efficiently generate power even at a relatively low speed rotation and maintain a stable charging voltage in the rechargeable battery is provided. can do.
According to the invention of claim 4, since the rechargeable battery is configured to be loaded into a rechargeable battery storage hole formed along the center of the drive shaft and / or the load shaft, It is possible to provide a torque measuring device that can minimize the centrifugal force acting on the rechargeable battery and can withstand high-speed rotation.
According to the fifth aspect of the present invention, the load shaft is provided with a circuit component storage case for storing circuit components such as the signal processing circuit and the transmission means. It is possible to provide a torque measuring apparatus for a rotating body that can perform modulation for amplification, signal conversion, and transmission of the corresponding signal in the rotating body, and can stably perform signal transmission to the stationary body without contact.

According to the invention described in claim 6, the torque detection means, the signal processing means, and the transmission means are supplied with electric power from the rechargeable battery to the load shaft even when the drive shaft is stopped. Since it is configured to be able to detect the torque at the time of stopping that is loaded, it is possible to provide a torque measuring device for a rotating body that can accurately measure the torque even when the rotating body is stopped.
According to the invention described in claim 7, the torque detecting means includes a plurality of strain gauges attached at an angular interval of 180 ° on a strain generating portion having a small diameter of the load shaft. Thus, since the shear strain generated in the strain generating portion can be detected, it is possible to provide a rotating body torque measuring device capable of accurately detecting a wide range of torque from a small torque to a large torque.
According to an eighth aspect of the present invention, the drive shaft and the load shaft are in contact with each other so that the pair of flange portions formed at the respective end portions are in contact with each other so that the shaft centers coincide with each other. Therefore, since the load shaft having the strain generating portion is attached to the drive shaft, the load shaft having the strain generating portion can be easily, quickly and accurately attached, and a torque measuring device for a rotating body that can be easily repaired is provided. be able to.

Hereinafter, a torque measuring device for a rotating body according to an embodiment of the present invention will be described with reference to the accompanying drawings.
FIG. 1 is a central longitudinal sectional view of a rotating body torque measuring device according to an embodiment of the present invention, FIG. 2 is a right side view of the rotating body torque measuring device shown in FIG. 1, and FIG. FIG. 4 is a cross-sectional view of an internal structure in a state where a casing member, a magnet fixing plate, a permanent magnet, and the like are removed from the torque measuring device for the rotating body shown in FIG. 5 is a cross-sectional view taken along line AA in FIG. 5, FIG. 5 is a right side view of FIG. 4, FIG. 6 is a perspective view of FIG. 4, and FIG. FIG. 8 is an exploded perspective view of FIG. 4. FIG.
The drive shaft 1 and the load shaft 2 constitute a rotational force transmission system having the drive shaft 1 as a driving shaft.
For example, the drive shaft 1 is connected to the output shaft of the engine via a coupling (not shown), and both are rotationally stopped by a key fitted in the key groove 1a.

Further, the load shaft 2 side is connected to an input shaft to which some load is applied, such as a drive shaft (propeller shaft) of an automobile (not shown) and an input shaft of a generator, via a coupling (not shown). The rotation is stopped by a key fitted in the key groove 2a.
A flange portion 1b is formed at one end portion (right end portion in FIG. 1) of the drive shaft 1, and a flange having a larger diameter than the flange portion 1b is formed at one end portion (left end portion in FIG. 1) of the load shaft 2. Part 2b is formed.
The flange portion 1b and the flange portion 2b are tightened as screw coupling means in a state in which so-called marking brazing portions where annular stepped portions are formed on the joint surfaces and the centers of both axes are matched. Both are connected by a screw 3 (see FIG. 8).

The drive shaft 1 and the load shaft 2 are rotatably supported with respect to the casing member 6 via two ball bearings 4 and 5.
The ball bearings 4 and 5 are inserted into concave grooves formed in the casing member 6 and are prevented from coming off by snap rings 7 and 8, and the outer end sides of the ball bearings 4 and 5 are stopped. The bearing retainers 9 and 10 attached by screws 11 and 12 are used to prevent the casing member 6 from coming off.
On one side (the left side in FIG. 1) of the casing member 6, a magnet fixing plate 14 made of an acrylic plate to which the permanent magnet 13 is fixed is attached by a set screw.
The magnet fixing plate 14 is integrated with the casing member 6 as described above, and is equiangularly spaced (in this example, on a virtual circle centered on the drive shaft 1 (hereinafter referred to as “first virtual circle”). , 60 ° intervals), a plurality (six in this example) of circular grooves or circular holes are formed, and a plurality of (six in this example 6) are formed in the circular grooves or circular holes. ) Permanent magnets 13 are inserted and fixed so as not to fall off.

On the other hand, the configuration on the rotation side will be described.
The flange portion 1b of the drive shaft 1 and the flange portion 2b of the load shaft 2 are respectively provided with a plurality of (in this case, eight) through-holes 1c and screw holes 2c in parallel to the central axis (FIG. 8). reference).
With the flange portions 1b and 2b being in contact with each other with the axial center aligned, the tightening screw 3 is inserted through the through hole 1c and screwed into the screw hole (female screw hole) 2c to be tightened strongly. It will be firmly joined.
Further, on the flange portion 2b side, a plurality (with an equal angle (60 ° in this example)) are spaced on the second virtual circle having the same radius as the above-described first virtual circle centered on the load shaft 2 (in this example, 60 °). In this example, six screw holes 2d are formed, and iron cores 16 are screwed into the screw holes 2d, and coils 17 are fitted into the iron cores 16, respectively. ing.

One end (the left end in FIG. 1) side of these coils 17 is in contact with an iron core fixing plate 18 made of an acrylic plate which is a non-magnetic material. Further, this iron core fixing plate 18 is attached to the flange portion 1b by a set screw 19. It is fixed.
As described above, the permanent magnet 13 fixed to the magnet fixing plate 14 on the fixed body side and the coil 17 fixed to the flange portion 1b on the rotating body side face each other so as to be relatively rotatable with a predetermined gap. Will be configured as follows.
An amplifier case 20 is further integrally attached to the flange portion 2b by a set screw 22. The set screw 22 passes through the through hole 2g formed in the flange portion 2b and is screwed into a screw hole 20a formed in the amplifier case 20.
Although not shown in the figure, the amplifier case 20 houses various circuit components, which will be described later. After the various circuit components are mounted, the amplifier case lid 21 is fixed by a set screw 23 so that the various circuit components are It will be held in a state that can withstand high-speed rotation.

An intermediate portion of the load shaft 2 is cut into a small diameter, and a strain generating portion 2e is provided. On the circumference of the strain generating portion 2e, at least two pairs are provided with an angular interval of 180 °. Strain gauges SG1 and SG2 are attached by adhesion, vapor deposition, welding, or other means.
That is, for example, the first strain gauge SG1 attached at an angle of about 45 ° with respect to the axial direction of the strain generating portion 2e (left and right direction in FIG. 1) at a position of 0 °, and the strain gauge SG1 A second strain gauge SG2 inclined and attached in a different direction by 90 ° is provided, and similarly, for example, at a position of 180 °, the first strain gauge SG1 and the second strain gauge SG2 are provided. And shall be provided.
In this way, the first strain gauge SG1 provided at the 0 ° position and the first strain gauge SG1 provided at the 180 ° position are connected to the opposite side of the bridge circuit (not shown), and the second strain gauge SG1 provided at the 0 ° position is provided. The strain gauge SG2 and the second strain gauge SG2 provided at the 180 ° position are respectively connected to adjacent sides of the bridge circuit.

When bridge power is supplied to the input terminal of the bridge circuit configured as described above, a detection signal (voltage or current) corresponding to the torque applied to the load shaft 2 is obtained from the output terminal of the bridge power supply.
The casing member 6 constituting the fixed body is provided with a mounting leg portion 6a for installation on a fixed portion such as a floor or a frame, a case main body 6b integrated with the mounting leg portion 6a, and a cutout of the case main body 6b. It comprises an opening lid 6d for closing the inspection opening 6c and a casing side plate 6e for closing the opening of the case body 6b.
Accordingly, one ball bearing 4 is fitted to the case main body 6 b of the casing member 6, and the other ball bearing 5 is fitted to the casing side plate 6 e of the casing member 6.
In these rechargeable battery storage holes 1f and 2f, a plurality (two in this case) of rechargeable batteries (secondary batteries) 24 are stored on the right end side of the drive shaft 1 and the left end side of the load shaft 2. Rechargeable battery storage holes 1f and 2f are respectively formed.
Although it is formed so as to straddle the drive shaft 1 and the load shaft 2, it may be formed only on one of the shafts, but on the strength of each shaft, there are flange portions 1b, 2b of both shafts 1, 2. It is desirable to provide it in the vicinity site.

Next, the outline of the electric circuit configuration of the present invention will be described.
First, in the power generation mechanism of the present invention, the permanent magnet 13 provided on the fixed side (case body 6b), and the coil 17 and the iron core 16 provided on the rotating side (flange portions 1b, 2b) are opposed to each other. Thus, when the coil 17 and the iron core 16 rotate, an electromotive force is generated in the coil 17 by electromagnetic induction. The current derived from the coil 17 is rectified by a rectifier circuit, for example, a rectifier circuit in which a diode is inserted into each of the four sides of the bridge, and further smoothed by a smoothing circuit including a smoothing capacitor and a regulator. Obtain a DC power supply.
Further, this DC power supply is charged to the rechargeable battery 24 as a further stabilized power supply via a voltage stabilization circuit.
The rechargeable battery 24 charged in this way is supplied as a power source for each circuit described later.

Next, the operation of the torque measuring device for a rotating body according to the embodiment described above will be described.
The drive shaft 1 of the torque measuring device for a rotating body having the above structure is connected to the output shaft of the prime mover via a coupling, and the load shaft 2 is cupped on the rotation shaft of the wind power generator to be measured, for example, Connect through the ring and set to the actual operating state.
When driving the prime mover in this state, the drive force of the prime mover is transmitted through the path of drive shaft 1 → flange portion 1b → flange portion 2b → distortion portion 2e → load shaft 2 → object to be measured (wind generator). Therefore, shear strain (torsion) corresponding to the torque applied to the strain-generating portion 2e formed to have a small diameter is generated.
This shear strain causes, for example, tensile strain in the pair of first strain gauges SG1, and causes compressive strain, for example, in the pair of second strain gauges SG2. When the bridge power supply is supplied from the rechargeable battery 24 to the input end of the bridge circuit in which the pair of first strain gauges SG1 is connected to the opposite side, and the pair of second strain gauges SG2 are connected to the opposite sides respectively. A strain detection signal (voltage or current) corresponding to the torque applied to the strain generating section 2e is output from the output end of the bridge circuit.

Although not shown in the figure, this distortion detection signal is, for example, DC amplified by a DC amplifier which is one of signal processing means, FM modulated or PCM modulated by a modulation circuit, and transmitted from the antenna by the transmitting means. The signal transmitted in this way is received by the receiving means via the receiving antenna provided on the stationary body side, that is, the casing member 6 side, optimally demodulated by the demodulation circuit, and offset, level by the DC amplifier. Etc., and displayed or recorded by a display or a recorder.
According to the torque measuring device for a rotating body in one embodiment of the present invention configured and operated in this way, it is not necessary to supply power from a fixed body (external), and therefore the power supply device and slip in the direct contact transmission system A ring, a brush, and the like are not required, and a power supply device, an oscillator, a rotary transformer, and the like in a non-contact transmission method are not required.

Further, according to the above-described embodiment of the present invention, since the rechargeable battery 24 is provided in addition to the power supply mechanism, the shear generated in the strain generating portion 2e even when the load shaft 2 is stopped. Strain can be detected and the applied torque can be accurately detected.
In addition, since a non-contact configuration that does not use a slip ring is adopted, sliding noise is not mixed into the detection output, high-accuracy torque can be measured, and high-speed rotation can be achieved. The dynamic torque during rotation can be accurately measured.
In addition, a power supply from the outside (for example, a commercial power supply of 100V to 200V is essential for the rotary transformer, but the present invention generates power by receiving rotational force from the rotating body. It is possible to actually measure engine torque, brake torque, propeller torque, and the like in automobiles and automobiles without any trouble.
In addition, since the rechargeable battery 24 is housed and held in the center of the drive shaft 1 and the load shaft 2, the moment of inertia is small and higher speed rotation can be realized.
Further, since the amplifier case 26 is provided on the rotating body side (load shaft side), the circuit components are stably held, predetermined signal processing is performed on the rotating body side, and stable signal transmission is performed.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a central longitudinal sectional view showing the overall configuration of a rotating body torque measuring device according to an embodiment of the present invention. It is a right view of FIG. It is a perspective view which shows the external appearance structure of the torque measuring apparatus of the rotary body which concerns on embodiment of FIG. FIG. 6 is a cross-sectional view in the direction of the arrows AA in FIG. 5 showing the internal structure in a state where a casing member, permanent magnet, magnet fixing plate, and the like are removed from the torque measuring device for the rotating body in FIG. 1. FIG. 5 is a right side view of FIG. 4. It is a perspective view which shows the external appearance structure of the internal structure shown in FIG. FIG. 2 is a perspective view showing the internal structure in an easily understandable manner by partially breaking a casing member of the torque measuring device for a rotating body according to the embodiment shown in FIG. 1. It is a disassembled perspective view which decomposes | disassembles and shows the internal structure of the torque measuring apparatus of the rotary body shown in FIG.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Drive shaft 1b, 2b Flange part 1f, 2f Rechargeable battery accommodation hole 2 Load shaft 2e Strain part 3 Tightening screw 4, 5 Ball bearing 6 Casing member 7, 8 Snap ring 9, 10 Bearing retainer 11, 12 Set screw 13 Permanent Magnet 14 Magnet fixing plate 16 Iron core 17 Coil 18 Iron core fixing plate 20 Amplifier case 21 Amplifier case lid 24 Rechargeable battery

Claims (8)

In a torque measuring device for a rotating body that is interposed between a drive shaft side and a load shaft side in a rotational force transmission system and measures torque transmitted between both shafts,
A power generation mechanism that is disposed between the fixed body and the rotating body and generates electric power with the rotation of the rotating body;
A rechargeable battery that is disposed on the rotating body side and stores electric power generated by the power generation mechanism;
Torque detecting means for detecting torque applied to the load shaft and outputting a detection signal;
A signal processing circuit for performing amplification, signal conversion and the like on the detection signal output from the torque detection means;
Transmission means for transmitting the output signal from the signal processing circuit to the stationary body without contact,
An apparatus for measuring torque of a rotating body, wherein the torque detecting means, the signal processing circuit, and the transmission means can be supplied with electric power from the power generation mechanism or the rechargeable battery. The power generation mechanism includes a plurality of permanent magnets disposed on a casing member constituting the fixed body or a member integral with the casing member, and the drive shaft or the load shaft constituting a part of the rotating body. The torque measuring apparatus for a rotating body according to claim 1, comprising a plurality of coils disposed on the flange portion of the rotating body. The plurality of permanent magnets are disposed on the casing member at equiangular intervals on a first virtual circle centered on the drive shaft, and the plurality of coils are centered on the drive shaft. A plurality of flanges are arranged at equal angular intervals on a second virtual circle having the same radius as the virtual circle, and the coils and the permanent magnets face each other with a predetermined gap. The torque measuring device for a rotating body according to claim 1, wherein the torque measuring device is provided. The said rechargeable battery was comprised so that it might load in the rechargeable battery accommodation hole drilled along the center part of the said drive shaft and / or the said load shaft, The any one of Claims 1-3 characterized by the above-mentioned. The torque measuring device for a rotating body according to 1. A torque measuring device for a rotating body, wherein the load shaft is provided with a circuit component storage case portion for storing circuit components such as the signal processing circuit and the transmission means. The torque detection means, the signal processing means, and the transmission means can detect the torque at the time of stopping applied to the load shaft by receiving power from the rechargeable battery even when the drive shaft is stopped. The torque measuring device for a rotating body according to any one of claims 1 to 5, wherein the torque measuring device is configured as described above. The torque detecting means comprises a plurality of strain gauges attached at an angular interval of 180 ° on a strain generating portion having a small diameter of the load shaft, and detects a shear strain generated in the strain generating portion. The torque measuring device for a rotating body according to claim 1 or 6, wherein the torque measuring device is configured to be obtained. The drive shaft and the load shaft are joined by a screw coupling means in a state where a pair of flange portions formed at respective end portions are in contact with each other so as to match the shaft center. The torque measuring device for a rotating body according to claim 1.

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