JPS5887436A - Detector for torque of rotary shaft - Google Patents

Abstract

PURPOSE:To provide a subject device which is excellent in durability and environment resistance, by a method wherein an auxiliary sliding mechanism is mounted between a driving shaft end and a coupling device, a screw mechanism is located between a driven shaft end and the coupling device, and the driving shaft and the driven shaft are coupled together through the medium of the coupling device. CONSTITUTION:One of a plurality of spline grooves 1a are formed in a driving shaft 1, a female screw 2b is formed in a driven shaft 2, and the two shafts are coupled together through the medium of a coupling device 3 comprising a spline key 3a and a male screw 3b. The groove 1a and the spline key 3a are adapted to transfer the rotation torque of the shaft 1 to the coupling device 3 in the direction of the shaft. With the shaft 1 turned, the coupling device 3 turns, and in case a rotation load is present on the driven shaft 2, it produces a shaft force which moves the coupling device 3 in the direction of the shaft with the aid of the screw mechanisms 2a and 3b. Finally, a displacement detector 5 detects the displacement, in the direction of the shaft, of the coupling device 3 from the outside, which results in facilitating detection of a torque.

Description

[Detailed description of the invention] Technical field of invention The present invention relates to a torque detection device for a rotating shaft.

Technical Background and Problems There has been a conventional device for detecting the torque of a rotating shaft, which uses an electric resistance wire cup gauge to detect the strain caused by the twisting of the shaft, and extracts this to the outside via a slip ring. be. However, since this device uses strain gauges, it has the disadvantage of poor durability and environmental resistance, and since mercury is used for the slip ring, it is not only safe but also expensive. Other methods include the inductance variation method and the magnetostriction method, but they are expensive because they use special materials and the detection equipment is complicated, and the equipment itself is large and cannot be used on general rotating machines. It is not suitable for hiring people.

OBJECTS OF THE INVENTION The present invention has been made in consideration of the above-mentioned point Kg, and an object of the present invention is to provide a torque detection device for a rotating shaft that is excellent in durability and environmental resistance, and is small and inexpensive.

Summary of the invention An axial sliding mechanism is provided between the end of the v4Fi drive shaft and one end of the coupling body, and a screw mechanism is provided between the end of the driven shaft and the coupling body, and the drive shaft is driven via the coupling body. The shaft and the driven shaft are connected, and a coil spring is disposed between a flange provided on the connecting body and the drive shaft and the driven shaft, and a displacement detection device is further installed. is arranged between the 7 langes provided at one end of the coupling body and the flange portion provided on the driven shaft at a distance of Km between the flange provided on the coupling body and the drive shaft and the driven shaft. shall be.

Embodiment of the invention No. 715!1lFi This is a sectional view of a torque detection device for a rotating shaft according to an embodiment of the present invention. F to Jbt are connected by a concatenated body jK.

Fig. 1 is a cross-sectional view of the position 'mm' in Fig. 1, and the spline groove /a of the drive shaft I and the spline key J1 of the coupling body J are connected to the drive shaft 1#)B rotation torque. An example of an axial sliding mechanism is shown in which the transmission is directly transmitted to the coupling body JK, and the coupling body J moves in the axial direction.In such a structure, when the drive shaft l rotates, the coupling body 3 rotates. However, when there is a rotational load on the driven shaft a, an axial force is generated by the screw mechanisms b and jb that tends to move the connecting body J in the axial direction. In order to maintain balance with this axial force,
A coil spring 41- and a coil spring 41-b are disposed between the flange J@ thrown on the connecting body 3 and the drive shaft l and the driven shaft, respectively, so as to obtain a repulsive force.

This shows the axial displacement that affects the torque transmitted between the drive shaft l and the driven shaft of the coupling body JFi constructed as described above. The axial displacement of this connecting body J is calculated from the outside,
Displacement detection plate! If it is detected, the torque can be detected by ToK.

Fig. 3 shows another embodiment of the present invention, in which the drive shaft / is provided with a spline key /1', and the driven wheel JK is a male threaded screw b.
' is bored and connected by a connecting body J having a spline 11Ja' and a female thread Jb'. Further, coil springs 411a and oh are respectively disposed between the 7 langes Je provided on the connecting body J and the driving shaft/and the driven shaft, so as to obtain a repulsive force against the axial displacement of the connecting body 3. Because it is not configured.

Therefore, it functions similarly to the previous embodiment.

Figure 3 shows a further embodiment of the present invention.

Coil springs a and +b are respectively disposed between the 7 langes J provided at one end of the connecting body J and the flange portions C and C provided on the driven shaft JK. In this way, the position of the coil spring is not limited to the center, and especially in the case shown in Figure 1, there is an advantage that no axial force acts between the driving shaft l and the driven shaft l.

Furthermore, in any of the above embodiments, there is no problem even if the relationship between the driving shaft l and the driven shaft is reversed.
Only one coil spring #a and #llb must be used!
For example, if both ends are fixed to generate both tensile and compressive forces, the same effect can be obtained with just one. In addition, if a ball screw is used for the screw mechanism or a ball spline is used for the axial slide mechanism, friction loss can be reduced and torque detection accuracy can be improved. On the other hand, any device may be used to detect the axial displacement of the connecting body J, regardless of whether it is a contact type or a non-contact type, and conversion into an electric signal can be easily performed.

DETAILED DESCRIPTION OF THE INVENTION According to the present invention, by converting torque into displacement and defining the displacement, the torque of the rotating shaft can be easily detected without using a slip ring or the like. Compared to conventional products, it has advantages such as being cheaper, more durable, and more compact.

[Brief explanation of drawings]

FIG. 1 is a cross-sectional view of a rotating body retort detection device according to an embodiment of the present invention, FIG. FIG. 3 is a cross-sectional view of a rotating body torque sensing device according to an example and further embodiments.

Claims (1)

[Claims] An axial sliding mechanism is provided between the end of the drive shaft and one end of the coupling body, and a screw mechanism is provided between the end of the driven shaft and the coupling body, so that the drive shaft and the driven wheel are connected through the coupling body. A spring is interposed between at least one of the connecting body and the driving shaft and between the connecting body and the driven shaft to maintain balance with the axial force of the connecting body, and a spring is provided outside the connecting body and the driven shaft. 1. A torque detection device for a rotating shaft, characterized in that a displacement detection device is installed to detect displacement of the connected body.