JPH11230838A - Torque meter - Google Patents

Abstract

PROBLEM TO BE SOLVED: To enable a torque meter which finds the torque transmitted through a torsion bar on the basis of the phase difference related to the angle of torsion which occurs when the torsion bar is twisted to sufficiently cope with high-speed rotations. SOLUTION: A driving-side magnetic flux change detecting means 4 detects the changes of the magnetic fluxes of driving-side magnets 231 and 232 which occur when a torsion bar l is twisted, and a load-side magnetic flux change detecting means 5 detects the changes of the magnetic fluxes of load-side magnets 331 and 332 which occur when the bar 1 is twisted. The detect signals of the detecting means 4 and 5 are given to the CPU 611 of a torque calculating means 6. The CPU 11 fetches the angle of torsion of the torsion bar 1 by converting the angle into a phase difference. The calculating means 6 finds the torque transmitted through the torsion bar 1 based on the fetched phase difference.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a torque meter capable of coping with high-speed rotation.

[0002]

2. Description of the Related Art As is well known, it is indispensable to employ a torque meter in a rotation tester.

Recently, various torque meters have been proposed which convert a phase difference generated by twisting a torsion bar into a torque.

[0004] A typical example of this type of torque meter is that when a torsion bar is transmitting torque, a torsional angle generated in the torsion bar in proportion to the torque is converted into an electrical phase difference and taken out. A phase-type digital torque meter (hereinafter, simply referred to as a "digital torque meter") that obtains the torque transmitted by the torsion bar by digitally processing the phase difference that has been taken out.

[0005] More specifically, the digital torque meter corresponds to two external gears fixed to a torsion bar and separated from each other by a predetermined length, respectively. And two magnetic circuits provided.

Each of the above magnetic circuits has an internal gear,
An annular permanent magnet and a detection coil are provided. Therefore, the magnetic flux from the permanent magnet passes through the path from the internal gear → the external gear → the torsion bar → the permanent magnet.
When the magnetic flux passing through the path formed in the order of the internal gear, the external gear, the torsion bar, and the permanent magnet changes, a voltage is induced in the detection coil.

[0007]

However, the following problems have been pointed out in the digital torque meter.

[0008] The above-mentioned digital torque meter employs an external gear and an internal gear. When the external gear rotates with the rotation of the torsion bar, the teeth of the external gear and the internal gear are rotated. The gap changes according to the tooth profile of both the external gear and the internal gear, and accordingly, the magnetic resistance of the path composed of the internal gear, the external gear, the torsion bar, and the permanent magnet changes. As a result, a sinusoidal alternating voltage signal that changes periodically every time the torsion bar rotates by the tooth pitch is induced in the detection coil.
Therefore, it is necessary to form the teeth of both the external gear and the internal gear with high precision by employing complicated mechanical processing. That is, it is inevitable that the machining of the teeth of both the external gear and the internal gear must be performed with a considerably high machining accuracy. For this reason, at low speed rotation, there is no significant problem, but at high speed rotation, the fact is that it becomes difficult to balance the rotation of the rotary motion transmitter mounted on both ends of the torsion bar. .

In the digital torque meter, grease bearings are provided at both ends of the torsion bar. Therefore, at the time of high-speed rotation, a situation occurs in which the frictional resistance generated between the torsion bar and the grease bearing increases. Also in this respect, it is difficult to cope with high-speed rotation.

The present invention has been made in view of such circumstances, and has as its object to provide a torque meter which does not require complicated mechanical processing and can sufficiently cope with high-speed rotation.

[0011]

To achieve the above object, a torque meter according to the first aspect of the present invention provides a torque meter which twists a torsion bar when the torsion bar is twisted. Based on the phase difference related to
The torque transmitted by the torsion bar is obtained, and at one end of the torsion bar, the torsion bar is fixed so as to be integrally rotatable with the torsion bar. A drive-side rotational motion transmitter that is capable of being transmitted to a torsion bar and has a drive-side magnetic body, and is fixed at the other end of the torsion bar so as to be integrally rotatable with the torsion bar, On the other hand, the rotational motion of the torsion bar can be transmitted to the load system, and the rotational motion of the torsion bar is generated when the torsion bar is twisted with the load-side rotational motion transmitter having the load-side magnetic body. A drive-side magnetic flux change detecting means for detecting a change in magnetic flux of the drive-side magnetic body; and a load-side magnetic body generated by twisting the torsion bar. Torsion of the torsion bar based on a load-side magnetic flux change detecting means for detecting a change in the bundle, a detection signal from the driving-side magnetic flux change detecting means, and a detection signal from the load-side magnetic flux change detecting means. The angle is converted into a phase difference and extracted, and torque calculating means for calculating the torque transmitted by the torsion bar based on the extracted phase difference is included.

In the above configuration, when the driving-side rotational motion transmitting body is connected to the driving system, while the load-side rotational motion transmitting body is connected to the load system, and then the driving system is operated, the driving side operates. The rotary motion transmitter transmits the rotary motion of the drive system to the torsion bar, while the load-side rotary motion transmitter is
The rotational motion of the torsion bar is transmitted to the load system. That is, the torsion bar is transmitting torque. Accordingly, a torsion angle is generated in the torsion bar in proportion to the torque. At this time, the drive-side magnetic flux change detection means detects a change in magnetic flux of the drive-side magnetic body caused by twisting the torsion bar, while the load-side magnetic flux change detection means twists the torsion bar. The change in the magnetic flux of the load side magnetic body caused by the above is detected. Then, the torque calculation means converts the torsion angle of the torsion bar into a phase difference based on the detection signal from the drive-side magnetic flux change detection means and the detection signal from the load-side magnetic flux change detection means. Based on the extracted phase difference, the torque calculating means obtains the torque transmitted by the torsion bar. In other words, by twisting the torsion bar,
In order to convert the resulting phase difference into torque, a drive-side magnetic body is mounted on the drive-side rotary motion transmitter, while a load-side magnetic body is mounted on the load-side rotary motion transmitter. Therefore, it is not necessary to perform complicated mechanical processing on both the driving-side rotary motion transmitter and the load-side rotary motion transmitter. Therefore, even at the time of high-speed rotation, it is possible to easily balance the rotation of the two rotary motion transmitters at both ends of the torsion bar. As a result, it is possible to sufficiently cope with high-speed rotation. In addition, the drive-side rotary motion transmitter is fixed at one end of the torsion bar so as to be able to rotate integrally with the torsion bar, while the load-side rotary motion transmitter is integrated with the torsion bar at the other end of the torsion bar. It is fixed as possible. Therefore, it is not necessary to attach bearings to both ends of the torsion bar. Also in this respect, it is possible to sufficiently cope with high-speed rotation.

According to a second aspect of the present invention, there is provided a torque meter according to the first aspect, wherein the torque calculating means includes a drive-side rotational motion transmitting body connected to only a drive system. The offset value at the time of resetting under a load condition is stored, and when the torsion angle of the torsion bar is converted into a phase difference and taken out, the stored offset value is read, and the read offset value is subtracted. It is characterized by including offset value correcting means for converting the torsion angle of the torsion bar into a phase difference.

In the above arrangement, when the torsion angle of the torsion bar is converted into a phase difference and taken out by the torque calculating means, the offset correcting means reads out the stored offset value and subtracts the read out offset value. Convert the torsion bar torsion angle to phase difference.
Therefore, it is possible to absorb an offset value generated at the time of assembling and with the aging. As a result, it is not necessary to pursue the positioning accuracy of the drive side magnetic body and the load side magnetic body very strictly.

According to a third aspect of the present invention, there is provided a torque meter according to the first or second aspect, wherein the torque calculating means determines a torque actually transmitted by the torsion bar. Corresponding to each rotation speed when the rotation speed is increased stepwise or continuously until the rotation speed reaches a predetermined rotation speed in a no-load state in which the driving-side rotational motion transmitter is connected only to the drive system. The torque transmitted by the torsion bar is calculated, and the obtained torque in a no-load state is temporarily stored, and the driving-side rotational motion is transmitted to both the driving system and the load system. When the torque transmitted by the torsion bar is actually determined in a state where the body and the load-side rotational motion transmitting body are connected, the torque transmitted by the torsion bar is determined. Prior to this, the torque in the no-load state stored is read out, and the torque transmitted by the torsion bar in a state where both the drive system and the load system are connected is obtained. A torque in the no-load state corresponding to the rotational speed at the time of the torque obtained in a state where both are connected is searched from the read-out torque in the no-load state, and the searched torque in the no-load state is used as the drive system. , And zero point correction means for performing zero point correction by subtracting from the torque in a state where both of the load systems are connected.

In the above configuration, the zero-point correcting means is configured to determine whether or not the torque transmitted by the torsion bar is in a non-load state in which the driving-side rotational motion transmitting body is connected only to the driving system. The torque transmitted by the torsion bar corresponding to each rotation speed when the rotation speed is increased stepwise or continuously until reaching a predetermined rotation speed is obtained. The zero point correction means temporarily stores the obtained torque in the no-load state. Thereafter, the torque actually transmitted by the torsion bar is transmitted to both the drive system and the load system in a state where the drive-side rotational motion transmitter and the load-side rotational motion transmitter are connected, respectively. When obtaining the torque, the zero point correcting means reads out the torque in the no-load state stored before obtaining the torque transmitted by the torsion bar, and also detects the torsion in a state where both the driving system and the load system are connected. Find the torque transmitted by the bar. Then, the zero point correction means searches the read-out torque in the no-load state for the torque in the no-load state corresponding to the rotational speed at the time of the torque obtained when both the drive system and the load system are connected. I do. The zero point correcting means applies the zero point correction by subtracting the retrieved torque in the no-load state from the torque in a state where both the driving system and the load system are connected. Therefore, the torque can be obtained after absorbing the mechanical loss of at least one of both the drive system and the load system. As a result, the obtained torque becomes highly accurate.

According to a fourth aspect of the invention, there is provided a torque meter according to any one of the first to third aspects, wherein at least the torsion bar is made of spring steel. It is assumed that.

In the above structure, at least the torsion bar is made of spring steel. Therefore, the spring property of the torsion bar is further enhanced, and the hysteresis generated in the torsion bar can be further suppressed when obtaining the torque. as a result,
The torque can be obtained with good reproducibility.

According to a fifth aspect of the present invention, there is provided a torque meter according to any one of the first to fourth aspects, wherein both the driving-side rotational motion transmitting body and the load-side rotational motion transmitting body are provided. , Provided integrally with the torsion bar.

In the above configuration, both the drive-side rotary motion transmitter and the load-side rotary motion transmitter are provided integrally with the torsion bar. Therefore, when designing the torque meter according to the specifications, it is only necessary to consider the design of the torsion bar alone.

[0021]

Embodiments of the present invention will be described below in detail with reference to the accompanying drawings. Embodiment 1 FIG. FIG. 1 is a block diagram showing an electrical configuration of the torque meter according to Embodiment 1 of the present invention.

Referring to FIG. 1, the torque meter according to the first embodiment is based on a phase difference relating to a torsion angle generated in torsion bar 1 when torsion bar 1 is twisted. Thus, the torque transmitted by the torsion bar 1 is obtained.

Specifically, the torque meter according to the first embodiment includes a driving-side rotational motion transmitting body 2 fixed at one end of the torsion bar 1 so as to be integrally rotatable with the torsion bar 1, At the other end, there is provided a load-side rotational motion transmitting body 3 fixed to the torsion bar 1 so as to be integrally rotatable.

The drive-side rotational motion transmitting body 2 transmits the rotational motion of the drive system to the torsion bar 1 with respect to a drive system (not shown). On the other hand, the load-side rotational motion transmitting body 3 transmits the rotational motion of the torsion bar 1 to a load system (not shown).

FIG. 2 is a perspective view showing the structure of the torsion bar, the driving-side rotary motion transmitting body, and the load-side rotary motion transmitting body, and FIG. 3 is a vertical sectional side view of FIG.

Referring to FIGS. 2 and 3, both drive-side rotational motion transmitter 2 and load-side rotational motion transmitter 3 are provided integrally with torsion bar 1. These torsion bar 1 and drive-side rotational motion transmitter 2,
The three members of the load-side rotational motion transmitting body 3 are made of spring steel, specifically, SUP-6.

As shown in FIG. 2, the driving-side rotational motion transmitting body 2 is an annular member, and is arranged in the axial direction so that the rotational motion of the driving system can be transmitted to the torsion bar 1 with respect to the driving system. A plurality (four) of drive-side connection holes 21 penetrating along are formed. These drive side connection holes 21 are mutually 9
They are arranged in a state of being phased by 0 degrees. As shown in FIG. 3, a pair of driving-side recesses 221 and 221 are formed on the outer surface of the driving-side rotational motion transmitting body 2 while avoiding the driving-side connection holes 21.
22 are formed. These drive side dents 221.22
2 are arranged 180 degrees out of phase with each other, and drive-side magnets 231 and 232 are fitted in the respective drive-side recesses 221.222. Each of the drive-side magnets 231 and 232 has a columnar shape. In addition, the shape of the drive-side magnets 231 and 232 is not particularly limited to a columnar shape, and any shape can be adopted.

As shown in FIG. 2, the load-side rotary motion transmitting body 3 is an annular member, and penetrates in the axial direction so as to transmit the rotary motion of the torsion bar 1 to the load system. A plurality of (four) load-side connection holes 31 are formed. These load-side connection holes 31 are arranged in a state of being shifted by 90 degrees from each other. Load side rotary motion transmitter 3
As shown in FIG. 3, a pair of load-side recesses 321 and 322 are formed on the outer surface of each of the first and second load-side connection holes 31 while avoiding each load-side connection hole 31. The load-side recesses 321 and 322 are arranged in a state of being 180 ° out of phase with each other, and load-side magnets 331 and 332 are fitted in the load-side recesses 321 and 322, respectively. Each of the load-side magnets 331 and 332 has a columnar shape. The load-side magnet 33
The shape of 1,332 is not particularly limited to a columnar shape, and any shape can be adopted.

Referring to FIG. 1 again, the torque meter according to the first embodiment twists the torsion bar 1 in addition to the driving-side rotary motion transmitter 2 and the load-side rotary motion transmitter 3. Each drive-side magnet 231,
A drive-side magnetic flux change detecting unit 4 for detecting a change in magnetic flux of the load-side magnets 232 in a contactless manner, and a load for detecting a change in magnetic flux of each of the load-side magnets 331 and 332 caused by twisting the torsion bar 1 in a contactless manner. Side magnetic flux change detecting means 5,
Based on the detection signal from the drive-side magnetic flux change detection means 4 and the detection signal from the load-side magnetic flux change detection means 5, the torsion angle of the torsion bar 1 is converted into a phase difference and extracted. And a torque calculating means 6 for calculating the torque transmitted by the torsion bar 1 based on the

As both the drive side magnetic flux change detecting means 4 and the load side magnetic flux change detecting means 5, an electromagnetic detector is employed. The drive-side magnetic flux change detection means 4 is arranged at a predetermined distance from one of the drive-side magnets 231 and 232. On the other hand, the load-side magnetic flux change detecting means 5 is disposed at a predetermined distance from one of the load-side magnets 331 and 332.

The torque calculating means 6 has a microcomputer 61. This microcomputer 61
Are the CPU 611 which controls the arithmetic processing center, the data RAM 6
12 and a program ROM 613.
The arithmetic processing is performed according to the program stored in 613.

The CPU 611 has a RAM 612 and an RO
M613 and each interface with each other. The CPU 611 is provided with respective detection signals of both the drive-side magnetic flux change detection means 4 and the load-side magnetic flux change detection means 5, and based on these detection signals,
U611 performs an arithmetic operation to determine the torque transmitted by the torsion bar 1, and displays the torque obtained by the arithmetic operation on the segment display 8 displaying seven segments. In particular, the CPU 611 has an offset correction function and a zero point correction function described later.

The RAM 612 stores an offset value and a torque in a no-load state described later. Here, the offset value is an arbitrary angle, with respect to only the drive system,
This is obtained by the CPU 611 when resetting is performed in the no-load state in which the driving-side rotational motion transmitter 2 is connected. The offset value and the torque in the no-load state are rewritten by the CPU 611 each time the torque is obtained.

Here, the operation of calculating the torque of the torque meter will be described.

First, the drive-side rotary motion transmitter 2 is connected to the drive system, while the load-side rotary motion transmitter 3 is connected to the load system. Thereafter, when the drive system is operated, the drive-side rotational motion transmitter 2 transmits the rotational motion of the drive system to the torsion bar 1, while the load-side rotary motion transmitter 3 transmits the rotational motion of the torsion bar 1 to the load system. To communicate. That is, the torsion bar 1 is in a state of transmitting torque. Along with this, the torsion bar 1
A torsion angle proportional to the torque occurs.

At this time, the drive side magnetic flux change detecting means 4
While detecting a change in the magnetic flux of each of the drive-side magnets 231 and 232 caused by twisting the torsion bar 1, the load-side magnetic flux change detecting means 5 detects each change caused by twisting the torsion bar 1. Load side magnet 331,
The change of the magnetic flux of 332 is detected. These detection signals of the drive-side magnetic flux change detecting means 4 and the load-side magnetic flux change detecting means 5 are given to the CPU 611 of the torque calculating means 6.

Then, the CPU 611 determines the torsion bar 1 based on the detection signal from the drive-side magnetic flux change detection means 4 and the detection signal from the load-side magnetic flux change detection means 5.
The torsional angle is converted to a phase difference and taken out. At this time, C
The PU 611 reads the offset value stored in the RAM 612 and subtracts the read offset value to convert the torsion angle of the torsion bar 1 into a phase difference. Then, the CPU 611, based on the extracted phase difference,
The torque transmitted by the torsion bar 1 is obtained. The CPU 611 displays the obtained torque on the segment display 8.
To be displayed.

By the way, when the drive-side rotary motion transmitter 2 is connected to the drive system and the load-side rotary motion transmitter 3 is connected to the load system and then the drive system is operated. , A drive system and a load system cause mechanical loss in at least one of them. Therefore, it is necessary to determine the torque after absorbing the mechanical loss.

Therefore, when determining the torque as described above, the CPU 611 performs a zero point correction on at least one of the drive system and the load system in order to absorb a mechanical loss.

More specifically, prior to the measurement of the torque, the rotational speed of the drive system is gradually increased until a predetermined rotational speed is reached in a no-load state with the driving-side rotational motion transmitting body 2 connected thereto. When raised, the CPU 611 obtains the torque transmitted by the torsion bar 1 corresponding to each rotation speed at that time. The CPU 611 writes and stores the obtained torque in the no-load state in the RAM 611.

When actually measuring the torque by connecting the drive-side rotational motion transmitter 2 and the load-side rotational motion transmitter 3 to both the drive system and the load system, respectively, the CPU 611 is used. Accesses the RAM 612 to read out the torque in the no-load state stored in the RAM 612 corresponding to the rotation speed at the time of torque measurement. Then, the CPU 611 converts the torsion angle of the torsion bar 1 into a phase difference based on the detection signal from the drive-side magnetic flux change detection means 4 and the detection signal from the load-side magnetic flux change detection means 5, and extracts the torsion angle. Based on the extracted phase difference, a torque in a state where both the driving system and the load system are connected is obtained. Then, the CPU 611 sets the RAM 61
From the torque in the no-load state read out from No. 2, the torque in the no-load state corresponding to the rotation speed when the torque in the state connected to both the drive system and the load system is obtained is searched. The torque in the no-load state is subtracted from the torque in a state where the torque is connected to both the drive system and the load system. The CPU 611 causes the segment display 8 to display the torque obtained by subtracting the torque in the no-load state.

Next, a specific procedure of the torque calculation operation will be described in detail with reference to FIG.

FIG. 4 shows a pulse waveform when the torsion angle of the torsion bar is extracted by converting the torsion angle into a phase difference based on the detection signals from the drive side magnetic flux change detection means and the load side magnetic flux change detection means. FIG.

In FIG. 4, A indicates a pulse related to the detection output of the drive-side magnetic flux change detection means 4, and B indicates a pulse related to the detection output of the load-side magnetic flux change detection means 5. Δτ is the drive-side magnetic flux change detection means 4
Is the cycle (delay time) from the input of the pulse A to the input of the pulse B when the input cycle of the pulse A related to the detection output of the above is τ.

1. Calculation of τ and Δτ The CPU 611 calculates an average of n pieces in order to increase the measurement accuracy (count resolution). In the first embodiment, n = 4, and data is fetched for each input of both pulse A and pulse B. Specifically, the CPU 611
Reads the offset value stored in the ROM 613 as in the following equation, and calculates the driving value based on the read offset value, the input period of the pulse A, and the input period of the pulse B. Every time four input pulses related to the detection output of the magnetic flux change detecting means 4 are counted, the total of the input periods τ1, τ2, τ3, τ4 of the pulse A and the period (delay from the input of the pulse A to the input of the pulse B) Time) Δτ
From the sum of 1, Δτ2, Δτ3, Δτ4, τ1 to τ4
Is calculated, and the average value Δτ of Δτ1 to Δτ4 is calculated.

Operational expression relating to average value τ1 = At1-At0 τ2 = At2-At1 τ3 = At3-At2 τ4 = At4-At3 τ = (τ1 + τ2 + τ3 + τ4) / 4 Operational expression relating to average value Δτ Δτ1 = Bt0− At0-Oset Δτ2 = Bt1-At1-Oset Δτ3 = Bt3-At3-Oset Δτ4 = Bt4-At4-Oset Δτ = (Δτ1 + Δτ2 + Δτ3 + Δτ4) / 4 where Oset is the offset value stored in the RAM6. is there.

2. Conversion of torsion angle θ The CPU 611 calculates the torsion angle θ by proportional calculation based on both the average value τ and the average value Δτ obtained in the above 1 as in the following arithmetic expression. θ = (180 × Δτ) / τ In the first embodiment, one wavelength corresponds to 180 degrees.

3. Calculation of Torque T The CPU 611 calculates the torque T based on the torsion angle θ converted in the above 2 as in the following arithmetic expression. T = (πd ⁴ Gθ) / 32l where d is the diameter of the torsion bar, G is the transverse elastic modulus, and l is the length of the torsion bar.

That is, according to the first embodiment, the following operation and effect can be obtained.

By twisting the torsion bar 1,
In order to convert the resulting phase difference into torque, the drive-side magnets 231 and 232 are
While the load-side magnets 331 and 332 are fitted on the outer surface side of the load-side rotational motion transmitting body 3. Therefore, the recesses 221 and 22 for fitting the drive-side magnets 231 and 232 into the outer surfaces of both the drive-side rotary motion transmitter 2 and the load-side rotary motion transmitter 3.
It is only necessary to perform a simple mechanical processing such as forming No. 2. That is, complicated mechanical processing is not required. Therefore, even at the time of high-speed rotation, it is possible to easily balance the rotation of the two rotational motion transmitters 2 and 3 at both ends of the torsion bar 1. as a result,
It is possible to sufficiently cope with high-speed rotation. In addition, the driving-side rotational motion transmitter 2 is fixed at one end of the torsion bar 1 so as to be able to rotate integrally with the torsion bar 1, while the load-side rotational motion transmitter 3 is connected to the torsion bar 1.
Is fixed to the torsion bar 1 so as to be integrally rotatable. Therefore, it is not necessary to attach bearings to both ends of the torsion bar 1, respectively. Also in this respect, it is possible to sufficiently cope with high-speed rotation.

A pair of driving magnets 231 and 232
Are arranged 180 degrees out of phase with each other,
The pair of load-side magnets 331 and 332 are
Are arranged in a phase-shifted state. Therefore, it is possible to improve the rotational balance of both the driving-side rotational motion transmitter 2 and the load-side rotational motion transmitter 3. Therefore, it becomes more suitable for high-speed rotation.

When the twist angle of the torsion bar is converted to a phase difference and taken out, the CPU 11 corrects the offset and then converts the torsion angle of the torsion bar 1 to a phase difference. Therefore, it is possible to absorb an offset value generated at the time of assembling and with the aging. as a result,
Drive-side magnetic bodies 231 and 232, and load-side magnetic bodies 33
There is no need to strictly pursue the alignment accuracy between the drive-side magnetic members 231 and 232, and between the drive-side magnetic members 331 and 332, and between the load-side magnetic members 331 and 332.

When obtaining the torque transmitted by the torsion bar 1, the CPU 611 performs zero point correction.
Therefore, the torque can be obtained after absorbing the mechanical loss of at least one of both the drive system and the load system. As a result, the obtained torque becomes highly accurate.

The torsion bar 1, the drive-side rotational motion transmitter 2, and the load-side rotational motion transmitter 3 are made of spring steel. Therefore, in addition to the resilience of the torsion bar 1 being further enhanced, when obtaining the torque, the torsion bar 1, the drive-side rotational motion transmitter 2, and the load-side rotational motion transmitter 3
Hysteresis occurring in the three can be further suppressed. As a result, torque can be obtained with good reproducibility.

The drive-side rotary motion transmitter 2 and the load-side rotary motion transmitter 3 are both provided integrally with the torsion bar 1. Therefore, when designing the torque meter according to the specifications, it is only necessary to consider the design of the torsion bar 1 alone.

Incidentally, an experimental result using the torque meter of the first embodiment is shown below.

<Experimental results> Torque test In the torque meter according to the first embodiment, a dedicated fixture for torque meter test (4980-0535-0) is used to form a torsion bar 1 having a diameter of 6 mm and a length of 160 mm.
A torque test was performed using a material manufactured using SUP-6 having mm and a spring constant of 0.16717 kg · m / deg. Specifically, this torque test was repeated three times to increase and decrease the torque. The result is shown in FIG.

As is apparent from FIG. 5, the torque is increased,
Despite the lowering, it was found that the linearity was good and there was almost no hysteresis. This is due to the fact that the torsion bar 1, the driving-side rotational motion transmitter 2, and the load-side rotational motion transmitter 3 are made of spring steel (SUP-6). it is conceivable that.

2. Load Test A load test was performed on both the torque meter of the first embodiment and the conventional digital torque meter with no load.

FIG. 6 shows the results of a load test performed on both of the above by increasing the rotational speed to 4000 rpm and then performing zero point correction.

After increasing the rotation speed to 4772 rpm, zero point correction was applied, and the result of the load test for both of them was shown in FIG.

As is clear from FIGS. 6 and 7, if the zero point is corrected at each rotation speed with the load “0”, both the torque meter according to the first embodiment and the conventional digital torque meter can be used. The monitor difference ΔM is extremely small (in the case of ΔM = 0.3%, in the case of ΔM = 0.1%), and even when the torque meter according to the first embodiment is used in the rotation tester, the accuracy is low. It turned out that there was no problem. This is considered to be due to the zero point correction.

Embodiment 2 FIG. 8 is a perspective view showing a torsion bar of a torque meter according to Embodiment 2 of the present invention, and a configuration of a driving-side rotational motion transmitting body and a load-side rotational motion transmitting body, and FIG. It is a cross-sectional plan view.

Referring to FIGS. 8 and 9, a feature of the second embodiment is that a pair of drive-side magnet sheets 241 and 242 are attached to each other by 180 degrees with respect to the outer peripheral surface of drive-side rotational motion transmitting body 2. In that the pair of load-side magnet sheets 241 and 242 are attached to the outer peripheral surface of the load-side rotary motion transmitter 3 in a state where they are 180 degrees out of phase with each other. Yes, other configurations are the same.

The drive-side magnet sheets 241, 242,
And as the load side magnet sheets 241, 242,
Each of them has a strip shape. The magnet sheets 241, 242, 241, 242 are not limited to the strip-shaped ones, but may be of any shape.

The operation for calculating the torque of the torque meter is the same as that in the first embodiment, and the description is omitted.

That is, according to the second embodiment, the following operation and effect are obtained in addition to the same operation and effect as those of the first embodiment.

A pair of drive-side magnet sheets 241 and 242 are arranged on the outer peripheral surface of the drive-side rotary motion transmitter 2 so as to be 180 ° out of phase with each other. , And a pair of load-side magnet sheets 341 and 342 are arranged in a state of being shifted by 180 degrees from each other. Therefore, both the drive-side rotary motion transmitter 2 and the load-side rotary motion transmitter 3 include:
Processing for incorporating the drive-side magnet sheets 241 and 242 and the load-side magnet sheets 341 and 342, respectively, is performed on the outer peripheral surfaces of both the drive-side rotary motion transmitter 2 and the load-side rotary motion transmitter 3. Extremely simple work such as attaching the drive side magnet sheets 241 and 242 and the load side magnet sheets 341 and 342, respectively, is sufficient.

The present invention is not limited to the above embodiments.

For example, in the first embodiment, four magnets may be arranged in a state where they are 90 degrees out of phase with each other. In the second embodiment, in a state where the four magnet sheets are out of phase with each other 90 degrees It may be arranged.

Further, a pair of magnets are arranged on the outer surfaces of both the driving-side rotary motion transmitting body 2 and the load-side rotary motion transmitting body 3 in a state of being phase-shifted by 180 degrees, respectively. A pair of magnet sheets may be arranged on the outer peripheral surfaces of both the body 2 and the load-side rotational motion transmitting body 3 in a state of being phase-shifted by 180 degrees.

Further, Embodiments 1 and 2
, The number of magnets and magnet sheets used may be one. Even in this case, the object of the present invention can be sufficiently achieved.

It goes without saying that various design changes and modifications can be made within the scope of the present invention.

[0074]

As is apparent from the above description, claim 1
According to the invention described in (1), in order to convert the phase difference generated by twisting the torsion bar into torque, the drive-side magnetic body is mounted on the drive-side rotary motion transmitter, while the load-side rotary motion is mounted. Due to the fact that the load side magnetic body is mounted on the transmitter side, complicated mechanical processing is not performed on both the drive side rotary motion transmitter and the load side rotary motion transmitter. And even at high speeds,
As a result, it is possible to easily balance the rotation of the two rotary motion transmitters at both ends of the torsion bar,
It is possible to sufficiently cope with high-speed rotation. In addition, the drive-side rotary motion transmitter is fixed at one end of the torsion bar so as to be able to rotate integrally with the torsion bar, while the load-side rotary motion transmitter is integrated with the torsion bar at the other end of the torsion bar. Since it is fixed as possible, it is not necessary to attach bearings to both ends of the torsion bar, and in this respect, it is possible to sufficiently cope with high-speed rotation.

According to the second aspect of the present invention, when the torsion angle of the torsion bar is converted into a phase difference and taken out,
Since the torsion angle of the torsion bar is converted to a phase difference after offset correction, the offset value generated during assembly and over time can be absorbed. It is not necessary to strictly pursue the alignment accuracy between the magnetic body and the load side magnetic body.

According to the third aspect of the present invention, when the torque transmitted by the torsion bar is obtained, the zero point correction is performed. Therefore, at least one of the drive system and the load system is used. As a result, the torque can be obtained after absorbing the mechanical loss of the above, and the obtained torque becomes highly accurate.

According to the fourth aspect of the present invention, at least the torsion bar is made of spring steel, so that the spring property of the torsion bar is further enhanced. As a result of being able to further suppress the hysteresis occurring in the bar,
The torque can be obtained with good reproducibility.

According to the fifth aspect of the present invention, since both the driving-side rotary motion transmitting body and the load-side rotary motion transmitting body are provided integrally with the torsion bar, according to the specifications, When designing the torque meter, it is only necessary to consider the design of the torsion bar alone.

[Brief description of the drawings]

FIG. 1 is a block diagram showing an electrical configuration of a torque meter according to Embodiment 1 of the present invention.

FIG. 2 is a perspective view showing a configuration of a torsion bar, a driving-side rotary motion transmitting body, and a load-side rotary motion transmitting body.

FIG. 3 is a vertical sectional side view of FIG. 2;

FIG. 4 is a diagram showing a pulse waveform when the torsion angle of the torsion bar is extracted after being converted into a phase difference based on detection signals from the drive-side magnetic flux change detection means and the load-side magnetic flux change detection means. is there.

FIG. 5 is a torque meter according to the first embodiment, which is provided with a dedicated fixture for torque meter verification (4980-05355-
0), the torsion bar 1 has a diameter of 6 mm, a length of 160 mm, and a spring constant of 0.16717 kg · m /
It is a figure which shows the result of having performed the torque test at the time of employ | adopting what was produced using SUP-6 which has deg as a raw material.

FIG. 6 is a diagram showing a load test of both the torque meter according to the first embodiment and a conventional digital torque meter in a no-load state. It is a figure which shows the result of having performed the load test of both.

FIG. 7 is a diagram showing a state where no load is applied, in order to perform a load test of both the torque meter of the first embodiment and a conventional digital torque meter, after increasing the rotation speed to 4772 rpm, and performing zero point correction; It is a figure showing the result of having performed the above-mentioned load test.

FIG. 8 is a perspective view showing a configuration of a torsion bar, a drive-side rotational motion transmitter, and a load-side rotational motion transmitter of a torque meter according to Embodiment 2 of the present invention.

FIG. 9 is a cross-sectional plan view of FIG.

[Explanation of symbols]

 REFERENCE SIGNS LIST 1 torsion bar 2 drive-side rotary motion transmitters 231 and 232 drive-side magnets 241 and 242 drive-side magnet sheet 3 load-side rotary motion transmitters 231 and 232 drive-side magnets 341 and 342 drive-side magnet sheet 4 drive-side magnetic flux change detecting means 5 Load side magnetic flux change detecting means 6 Torque calculating means 61 Microcomputer 611 CPU 612 RAM 613 ROM

Claims (5)

[Claims] 1. The method of claim 1, wherein when the torsion bar is twisted, a torque transmitted by the torsion bar is determined based on a phase difference related to a torsion angle generated in the torsion bar. At one end of the torsion bar, the torsion bar is fixed so as to be able to rotate integrally with the torsion bar, and the driving system is capable of transmitting the rotational motion of the driving system to the torsion bar. A drive-side rotational motion transmitting body provided, and the other end of the torsion bar is fixed so as to be integrally rotatable with the torsion bar, and the rotational motion of the torsion bar is transmitted to the load system with respect to the load system. A load-side rotating motion transmitting body that is capable of transmitting and includes a load-side magnetic body; and the drive that is caused by twisting the torsion bar. Drive-side magnetic flux change detecting means for detecting a change in magnetic flux of the side magnetic body, and load-side magnetic flux change detecting means for detecting a change in magnetic flux of the load-side magnetic body caused by twisting the torsion bar, Based on the detection signal from the drive-side magnetic flux change detection means and the detection signal from the load-side magnetic flux change detection means, the torsion angle of the torsion bar is converted into a phase difference and extracted, and the extracted phase difference A torque calculating means for obtaining a torque transmitted by the torsion bar based on the torque meter. 2. The torque meter according to claim 1, wherein the torque calculating means stores an offset value when resetting is performed only in a driving system in a no-load state in which the driving-side rotational motion transmitting body is connected. When the torsion angle of the torsion bar is converted to a phase difference and taken out, the stored offset value is read, and the read offset value is subtracted to convert the torsion angle of the torsion bar into a phase difference. A torque meter including offset value correcting means. 3. The torque meter according to claim 1, wherein the torque calculating unit is configured to control the drive system only for the drive system prior to obtaining the torque actually transmitted by the torsion bar. In a no-load state with a rotating motion transmitting body connected, when the rotation speed is increased stepwise or continuously until a predetermined rotation speed is reached, the torque transmitted by the torsion bar corresponding to each rotation speed is The obtained torque in the no-load state is temporarily stored, and the drive-side rotational motion transmitter and the load-side rotational motion transmitter are respectively applied to both the drive system and the load system. When the torque transmitted by the torsion bar is actually determined in the connected state, the torque in the no-load state stored before the torque transmitted by the torsion bar is determined. In addition to reading the torque, the torque transmitted by the torsion bar when both the drive system and the load system are connected is determined, and the rotation at the torque determined when both the drive system and the load system are connected is obtained. The torque in the no-load state corresponding to the number is searched from the read torque in the no-load state, and the searched torque in the no-load state is obtained in a state where both the drive system and the load system are connected. A torque meter, comprising: a zero-point correcting unit for performing a zero-point correction by subtracting the torque from the torque. 4. The torque meter according to claim 1, wherein at least the torsion bar is made of spring steel. 5. The torque meter according to claim 1, wherein both the driving-side rotational motion transmitting body and the load-side rotational motion transmitting body are provided integrally with the torsion bar. A torque meter characterized in that it is used.