JPS59147231A - Flexible coupling for measuring torque - Google Patents

Abstract

PURPOSE:To measure the torque of a rotary shaft, by such a simple and inexpensive constitution that displacement angle mutually generated in the flanges of a drive shaft and a driven shaft are detected by a mutual displacement angle detecting mechanism and transmission torque is detected by the product of the displacement angle and spring constant. CONSTITUTION:When power is transmitted to the side of a driven shaft 2 from a drive shaft 1, a coil spring 9 is distorted only at the angle corresponding to the torque of transmission power and a mutual angle is held between the flanges 5, 6 of both shafts. Marker sensors 11, 12 generate the pulse signals corresponding to the displacement angle with respect to this displacement. A phase angle is generated in the mutual pulse signals and, therefore, if they are treated with a signal processing device 13 and only the phase angle is displayed, the mutual displacement angle of the flanges 5, 6 can be displayed and, if said angle is multiplied by the elasticity constant of the coil spring 9, transmission torque can be displayed.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a flexible coupling for torque measurement in which a rotary shaft coupling coupled via an elastic spring and a relative displacement detection mechanism for torque if measurement are mounted and integrated.

Conventional rotary shaft couplings connect two rotary shafts to each other to transmit power, and the torque sensor of the rotary shaft torque detection device detects the torsional displacement angle between the gage points of a specially prepared torsion shaft. The structure is such that rotation and shaft torque can be measured.

These two have independent structures and there is no functional relationship between them. Therefore, in the latter case, when the drive side and the driven side are connected axially, the connection distance is longer by the torsion axis. This increases the installation area, and in some cases, it may be necessary to install a bearing to support the torsion shaft.
Further, as a matter of course, a rotating shaft coupling is required at both ends of the torsion shaft, which complicates the mechanism and inevitably increases the price.

The present invention has been made in view of these points. To explain this with reference to figures, FIG. 1q) is a side view thereof, and (b) is a front view thereof. In the figure, if (1) is the drive side rotation shaft, (2) is the driven side rotation shaft, (3) is the coupling boss on the drive shaft side, (4) is the coupling boss on the driven shaft side, and (5) is the drive shaft. A side coupling flange, (6) is a driven shaft side coupling flange, (7) and (8) are displacement angle generation markers provided on the outer periphery of the flange (5L (6), and (9) is a side coupling flange for the driven shaft side. ), (6) is an elastic coil spring that connects them, (10) is a displacement angle signal transmitter/receiver, (1
1) is the driving shaft side marker sensor, (12) is the driven shaft side marker sensor, (13) is the sensor (11),
The signal processor (12) and (14) may be used as a relative displacement angle indicator, a power indicator, or a power indicator.

Plunge (6) the displacement angle generation markers (7) and (8),
If the magnetic protrusions are arranged at equal intervals on the outer periphery of (6), then
Magnetoresistive pulse detectors are used for the marker sensors (11) and (12) of this kettle, and when a magnetized magnetic pole is provided on the outer periphery of the flange, it becomes a pulse voltage detector based on changes in magnetic flux. If the marker (7L (8)) is a scale with different colors as an optical detection mechanism, it will also become a reflected light for the projected light, and this will be detected optically, and the detection method is is not particularly limited. In either case, since the flange is a flexible coupling via an elastic spring, the marker detection sensor (1
1) and (12) are preferably of a type that detects the flange (5L(6) in a non-contact state from the viewpoint of mechanism and operation and maintenance.Next,
If it is assumed that a helping force is delivered from the driving shaft (1) to the driven shaft (2) side in a rotating state, the coil spring (9) of this coupling will be twisted by that angle in response to the torque of the delivered power, A relative angle is maintained between the flanges (5L (6)). In response, the marker sensors (11) and (12) generate electrical or optical pulse signals corresponding to the displacement angle. Since a phase angle occurs between mutual pulse signals, this is processed by a signal processor (13),
If only the phase angle is displayed, the flanges (5) and (6)
), as well as the relative displacement angle of the coil spring (9).
If we specify the product of the elastic constant and the axial torque,
Furthermore, it is clear that by calculating the product with the rotational speed, the power delivered to the shaft can be obtained.

In this case, if the shaft power is zero, the marker (
If the output from 7L (8) is in the same phase and the output instruction is adjusted to zero, it is convenient for calculation processing, and the phase difference due to the relative displacement angle between the flanges can be used to calculate the relative displacement angle, rotating shaft torque, output power, etc. It is possible to give instructions. It is well known that phase difference detection between two pulses of variable frequency in a rotating state can be processed by an arithmetic circuit that eliminates the variable frequency, and there are various methods for this.

As described above, the present invention detects the relative displacement angle of the flanges caused between the flanges of the driven shaft and the drive of the flexible coupling via the elastic spring using the relative displacement angle detection line groove, and calculates the relationship between the displacement angle and the elastic spring constant. Since the output power is instructed based on the product of the shaft torque or rotation speed,
Its construction is extremely simple, and at the same time, the installation area of the driving machine and driven machine is significantly reduced compared to the conventional one, and the price is also low.It can be used not only as a measuring device, but also for constant operation. It can also be easily used as a protection device.

[Brief explanation of the drawing]

Claims (1)

[Claims] In a flexible coupling that connects a driving shaft and a driven shaft via an elastic spring, a relative displacement angle detection mechanism of the flanges detects the displacement angle that occurs between the flanges of both shafts due to the applied torque, and calculates the displacement angle and the spring constant. A flexible coupling for torque measurement, which is characterized by detecting the delivered torque from the product of .