JPH03200043A - Torsion angle detection device in rotary torsion testing machine - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention uses a test piece that is a driving part that is used in a rotating state where torsional force is applied, such as a clutch disk for an automobile clutch. This invention relates to a torsion angle detection device that detects the angle of twist applied to a test piece in a rotary torsion tester used to test the durability against rotational torsion of a test piece.

[Conventional technology]

In order to test the durability of a damper spring or the like attached to a clutch disc, it is necessary to repeatedly apply rotational torsional force between the spline hub of the clutch disc and the disc plate. For this purpose, conventional
As shown in the figure, the rotary shaft 2 is rotatably driven by a drive motor 1, and the rotary actuator 3 is installed in the rotary shaft 2 and generates torque repeatedly in forward and reverse rotation. A hollow portion 2a is formed through which the output shaft 3a of the rotary actuator 3 is inserted along the direction, and an end portion 2b of the rotary shaft 2 in which the hollow portion 2a is formed and an end portion 3b of the output shaft 3a. Generally, there is a rotary torsion testing machine in which the outer and inner circumferences of the test piece 4 are fixed using fixing jigs (not shown), respectively, and dynamic torsion torque is applied to the inner and outer circumferences of the test piece 4 while rotating the test piece 4. It was used.

In the figure, the rotation of a drive motor 1 is transmitted via a drive belt 5 to a rotating shaft 2, and the rotating shaft 2 is a zero-rotation shaft rotatably supported on a base B by bearings 6a and 6b at both ends thereof. 2 is also supported by bearings 6C and 6d even in a heavy portion where the rotary actuator 3 is formed inside. As the rotary actuator 3, for example,
Those disclosed in Japanese Patent No. 879 and the like can be used.

Inside the rotary shaft 2, as shown in FIG. 10, an output shaft 3a is rotatably supported, and a space 2e is formed which is divided into two inner chambers 2c and 2d by the supported output shaft 3a. There is. Each of the inner chambers 2c and 2d is further divided by a pair of fins 3a provided symmetrically around the outer periphery of one end of the output shaft 3a.
It is divided into two hydraulic chambers of 2ft to 2fa. Each of the hydraulic chambers 2f to 2fa has a servo valve 3C.
By switching, hydraulic pressure is selectively supplied through the hydraulic paths 2g+ to 2gm, and the output shaft 3a is rotated in the forward and reverse directions with respect to the rotating shaft 2 within a predetermined angular range.

In this way, the rotary actuator 3
A relative rotational torque is generated between the output shaft 3a and the output shaft 3a,
This is applied between the inner circumference and the outer circumference of the test piece 4, and the test piece is subjected to a rotational torsion test.

Incidentally, in order to detect the rotational torsional torque applied to the test piece 4, a torque detector 8 is connected in series to the output shaft 3a via a flexible coupling mechanism 78, and the torque detector 8 detects the torque. An electric signal corresponding to the torque generated is transmitted through a through hole 3 formed at the center of the output shaft 3a and the rotating shaft 2.
The signal is guided to one end of the rotating shaft 2 via the signal line inserted through d and 2h, and is outputted via a slip ring (not shown).

Note that since the torque detector 8 is provided on the output shaft 3a, the rotary shaft 2 is also divided, and the divided rotary shafts 2 are connected by a flexible coupling mechanism 7b.

In addition, two rotary encoders 9a and 9b are provided to detect the rotation angle of the rotational twist applied to the test piece 4, and one rotary encoder 9a is connected to the rotating shaft 2.
The drive bell 9a is connected to the drive bell 9a to generate a pulse signal corresponding to the rotation of the rotary shaft 2. The other rotary encoder 9b is rotatably provided on the rotating shaft 2, and has a long hole 7 formed in an arc shape in the flexible coupling mechanism 7b.
The drive belt 9b is connected to a pulley 9bz to which the output shaft 3a is connected via a connecting rod 9b inserted through the
, and generate a pulse signal according to the rotation of the rotating shaft 2, which is increased or decreased by the rotation of the output shaft 3a. By processing the pulse signals generated by these two rotary encoders 9a and 9b, it is possible to detect the relative rotational angle between the rotating shaft 2 and the output shaft 3a, that is, the rotational twisting angle applied to the test piece 4. .

The torque and rotational twist angle detected as described above are
It is used to feedback-control the servo valve 3C and apply a predetermined twisting torque and twisting angle to the test piece 4.

For food pack control of the servo valve 3C, the 12th
As shown in the figure, the pulse signal generated by the rotary encoder 9a is input as an increment pulse, and the pulse signal generated by the rotary encoder 9b is input as a decrement pulse to the up/down counter 10, and the output of the up/down counter 10 is input to both pulse encoders 9a.
and 9b output a digital signal corresponding to the difference in the number of pulses generated, and the digital output of the up/down counter 10 is converted into an analog signal by a digital/analog (D/A) converter 11 to determine the twist angle. There is.

[Problem to be solved by the invention]

In the conventional device described above, the torsion angle is detected by processing pulse signals from the rotary encoders 9a and 9b, which are connected to the rotary shaft 2 and the output shaft 3a, respectively, via the drive belt. Due to constraints imposed by the rotation coupling mechanism for transmitting rotation to the
In tests where the frequency is higher than Hz, it becomes impossible to perform the specified control due to the strength of the drive belt, and the internal structure of the low-return encoder increases noise and makes malfunctions more likely.Furthermore, the rotary output structure of the output shaft causes tearing. There were many problems, such as not being able to take a large angle.

Therefore, the present invention solves the above-mentioned problems of the conventional method, enables testing at a larger torsion angle, and
An object of the present invention is to provide a torsion angle detection device for a rotary torsion testing machine that can accurately detect the torsion angle applied to a test piece even during high-speed testing.

[Means for Solving the Problems] In order to solve the above problems, the torsion angle detection device according to the present invention includes a rotating shaft rotationally driven by a drive morph, and a rotating shaft provided in the rotating shaft for forward and reverse rotation. a rotary actuator that repeatedly generates torque, a hollow portion is formed in the rotating shaft through which the output shaft of the rotary actuator is inserted along the axial direction, and a test piece is provided at the rotating shaft end and the output shaft end. In a rotary torsion testing machine in which the outer and inner circumferential parts of the test piece are fixed respectively and dynamic torsion torque is applied to the inner and outer circumferences of the test piece while rotating the test piece, an N pole is installed in the hollow part on the rotating shaft side. , a strip member having S poles alternately magnetized is disposed concentrically with the output shaft, and facing the strip member on the output shaft side to detect the magnetic flux due to the N pole and S pole of the strip member; A magnetic flux sensor that generates electrical signals with different phases due to relative rotation between the rotating shaft and the output shaft is arranged, and the angle of twist applied to the test piece is detected based on the electrical signal generated by the magnetic flux sensor. It is characterized by the fact that it is made to do so.

[Function] In the above configuration, on the rotating shaft side, a band-like member magnetized with N and S poles alternately is arranged in a hollow part thereof, concentrically with the output shaft, and on the output shaft side, a band-like member is arranged opposite to the band-like member. , N of the strip member
Magnetic flux sensors are installed that detect magnetic flux due to poles and south poles and generate electrical signals with different phases depending on the relative rotation between the rotating shaft and the output shaft, so the electrical signals generated by the magnetic flux sensors Based on the change in the relative rotation angle between the rotating shaft and the output shaft of the rotary actuator, that is, the difference between the outer and inner peripheries of the test piece fixed to the rotating shaft end and the output shaft end, respectively. The angle of applied dynamic twist can be detected.

〔Example〕

Embodiments of the present invention will be described below based on the drawings.

FIG. 1 is a diagram showing the main parts of an embodiment of the torsion angle detection device in a rotary torsion testing machine according to the present invention. A code is attached.

In FIG. 1, the rotary shaft 2 is divided into parts in order to accommodate a torque detector 8 in the middle of the output shaft 3a of the rotary actuator 3 in its hollow portion. A flange 2j is fixed to each of the divided rotating shafts 2, and the flange 2j faces the flanges 2i+ and 2iz of the cylindrical member 21, respectively, and is connected by a flexible coupling mechanism 7b. A recess 2JI is formed coaxially with the output shaft 3a in the flange 2j fixed to the rotating shaft 2, and the inner peripheral wall of the recess 2JI has an N groove as shown in simplified form in FIG.
A strip-like member 12 is attached, in which poles and south poles are alternately magnetized to appropriate lengths.

On the other hand, a flange 3e is attached to the divided output shaft 3a to connect the torque detector 8 via the flexible coupling mechanism 7a, and a detection head 13 is fixed to the flange 3e facing the strip member 12. ing.

The detection head 13 detects the magnetic flux due to the north and south poles magnetized on the strip member 12, and the relative rotation between the rotating shaft 2 and the output shaft 3a causes them to mutually rotate as shown in FIG. It consists of two magnetic flux sensors 13a and 13b (see FIG. 3) that each generate electrical signals with a phase difference of 90 degrees. The electric signals generated by the magnetic flux sensors 13a and 13b, like the electric signals generated by the torque detector 8, are led out through a through hole 3d formed in the center of the output shaft 3a.

The electric signals generated by the magnetic flux sensors 13a and 13b of the detection head 13 are processed by a waveform shaping circuit a14 as shown in FIG.
a and 14b, where the waveforms are shaped and converted into rectangular waves. Now, the phase of the electric signal generated by the magnetic flux sensor 13a is higher than that of the magnetic flux sensor 13b on the rotating shaft 2.
When the output shaft 3a is provided so that its phase precedes the positive rotation direction by 90 degrees, the electric signals generated by the magnetic flux sensors 13a and 13b in response to the rotation of the output shaft 3a in the positive direction are generated by the waveform shaping circuits 14a and 14b. It is converted into a rectangular wave as shown in FIG. On the other hand, the electrical signals generated by the magnetic flux sensors 13a and 13b in response to the reverse rotation of the output shaft 3a are processed by waveform shaping circuits 14a and 14b into the fifth
It is converted into a rectangular wave as shown in the figure.

The output signals of the waveform shaping circuits 14a and 14b are input to a frequency multiplier circuit 15 and a rotation direction determining circuit 16.
The rotation direction determination circuit 16 determines whether the output shaft 3a is rotating forward or backward depending on whether the electric signal from the magnetic flux sensor 13b is at the L level or the H level at the rise of the electric signal from the magnetic flux sensor 13a. Invert. The determination result by this rotation direction determination circuit 16 is determined by the frequency multiplier circuit 1.
5, and is used to determine whether the rectangular wave multiplied by 4, for example, of the frequency multiplier circuit 15 should be input into the up/down counter 17's up/down counter 17. As a result, the up/down counter 17 counts up when the output shaft 3a rotates in the forward direction with respect to the rotating shaft 2, and counts down when the output shaft 3a rotates in the opposite direction. The count value of the up/down counter 170 becomes a value corresponding to the rotation angle of the output shaft 3a with respect to the rotation shaft 2, that is, the torsion angle. Therefore, by converting this into an analog signal by the D/A converter 18 and inputting it to a servo control system (not shown) and controlling the servo valve 3c, a predetermined torsional rotation is applied to the inner and outer circumferences of the test piece 4. The rotary actuator 3 can be operated.

In order to rotate the rotary shaft 2 at a predetermined rotation speed by driving the drive motor 1, it is necessary to detect the rotation speed and the direction of rotation of the rotary shaft 20. For this purpose, for example, as shown in FIG. A gear 20 made of a magnetic material is fixed to the rotating shaft 2, and a magnetic sensor 21 is arranged opposite to the gear 20.

Further, in the illustrated embodiment, the band member 12 is attached to the inner circumferential wall of the recess 2j+ formed in the flange 2j fixed to the rotating shaft 2, but as shown in FIGS. A strip member 1 is provided on the plate surface concentrically with the output shaft 3a.
2 and two magnetic flux sensors 13a facing it.
and 13b may be attached to the flange 3e on the output shaft 3a side.

〔effect〕

As explained above, according to the present invention, the output of the rotary shaft and rotary actuator is achieved by the belt-shaped member arranged on the rotating shaft side and magnetized alternately with N and S poles, and the magnetic flux sensor arranged on the output shaft side. Detects the change in the relative rotation angle between the shaft and the shaft, that is, the rotation angle of dynamic torsion applied between the outer and inner circumferences of the test piece fixed at the end of the rotating shaft and the end of the output shaft, respectively. Since the rotary encoder connected to the rotary shaft and output shaft by a drive belt as in the past is not used, it is not possible to control tests at high torsional repetition frequencies due to the restrictions imposed by the rotary coupling mechanism. The structure is designed to prevent noise from occurring, so malfunctions do not occur, and the twist angle can be increased, making it possible to test at larger torsion angles and reducing the amount of torsion applied to the test piece. The effect is that angles can be detected accurately even in high-speed tests.

[Brief explanation of drawings]

Fig. 1 is a diagram showing an embodiment of the torsion angle detection device in a rotary torsion testing machine according to the present invention, Fig. 2 is an explanatory diagram showing the principle of the torsion angle detection device in Fig. 1, and Fig. 3 is an illustration of the device. A block diagram showing the circuit configuration, FIGS. 4 and 5 are timing charts showing the principle of detecting the torsion direction in the device, FIG. 6 is an explanatory diagram showing an example of how to detect rotation of the rotating shaft, and FIG. 8 and 8 are views showing a modified example of the device, FIG. 9 is a view showing an example of a conventional torsion angle detection device, FIGS. 10 and 11 are enlarged views of a portion of FIG. 9, and FIG. The figure is a block diagram showing the circuit configuration of a conventional device. l... Drive motor, 2... Rotating shaft, 3... Rotary actuator, 2a... Hollow part, 4... Test piece, 12... Band-shaped member, 13... Detection head, 13a
, 13b... Magnetic flux sensor.

Claims (1)

[Scope of Claims] A rotary shaft rotatably driven by a drive motor, and a rotary actuator installed in the rotary shaft and generating torque repeatedly in forward and reverse rotation, A hollow portion is formed through which the output shaft of the rotary actuator is inserted, and the outer and inner circumferential portions of the test piece are fixed to the rotary shaft end and the output shaft end, respectively, and the inner and outer circumferences of the test piece are formed while rotating. In a rotary torsion testing machine configured to apply dynamic torsional torque, a belt-shaped member having alternately magnetized north and south poles is disposed in a hollow portion on the side of the rotating shaft concentrically with the output shaft; The shaft side faces the band-shaped member, detects magnetic flux due to the north and south poles of the band-shaped member, and generates electrical signals having mutually different phases due to relative rotation between the rotating shaft and the output shaft. What is claimed is: 1. A torsion angle detection device, characterized in that a magnetic flux sensor is disposed, and an angle of twist applied to a test piece is detected based on an electric signal generated by the magnetic flux sensor.