JPS58108429A - Torque detector - Google Patents

Abstract

PURPOSE:To obtain a torque detector having a short axial length and a simple structure, by disposing input and output shafts through a movable gear which is axially movable, and detecting an axial displacement amount of the movable gear due to a component force of a rotational torque. CONSTITUTION:A linear spline is provided on a side 8b of a larger-diameter part 8a of a movable gear 8, while a helical spline is provided on a side 8c. The linear spline on the side 8b is meshed with a linear spline on an input shaft 2, and the helical spline on the side 8c is mashed with a helical spline on an output shaft 3. When a torque is applied, a torsional force acts between the input shaft 2 and the output shaft 3, and the movable gear 8 is subjected to a force causing the same to be withdrawn or pushed out depending on the force applied to the helical spline. The direction of the force is determined by the direction of the torque. The movable gear 8 moves until the size of the torque balances with the resilient force of a spring 9 or 10 by deflection. The amount of the movement is measured by employing a displacement sensor 11.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a torque detector that measures transmitted torque.

Conventionally, there has been an Amano torque detector shown in FIG. 1 as a torque detector for measuring transmitted torque. The torque detection S shown in FIG. Gears 4 and S are provided on the side and the output shaft 3419, respectively, and the rotational phases of the gears 4 and 5 are detected by electromagnetic pickups 62 and 7, which are arranged to face the gears 4 and 5. In other words, the torque applied to the torsion bar 1 is 1 when it is almost 0. For example, the phase of the output of the pickup 6 obtained from the gear 4 and the output of the pickup 7 obtained from the gear 5 is 't-180.
Shift the gate by AND of the outputs of pickups 6 and 7. If the total number of pulses passing during this period is %lc, then the torsion bar 1
When torque is applied to 9 and the phase difference between gear 4 and gear 5 becomes 7:0 from 1800 due to the twist of torsion bar 1, the AN of the output of pickup 6 and the output of pickup 7 becomes
The D signal has a sharp pulse length proportional to the magnitude of the torque.
This is to open the clock and measure the number of clock pulses that pass during this time.

Although the conventional torque detector described above has good accuracy, the torsion of the torsion bar is proportional to the fourth power of the diameter of the torsion bar, and is proportional to the length and torque.
-High precision is required for machining the diameter of the john par, 1y:
This has the disadvantage that the measurement circuit becomes complicated and the length becomes longer.

The present invention is an attempt to solve the above-mentioned drawbacks of the conventional ones, and the input shaft and the output shaft are coaxially opposed to each other via a movable gear that is movable in the axial direction, and the movable The gear is provided with a linear spline and a helical spline, and -1 and the other of these splines are installed 77 on the input shaft and the output shaft, respectively, and meshed with the varnish splines.

By displacing the movable gear in the axial direction by a component of rotational torque and detecting torque by the amount of displacement or strain, the axial length is short, the structure is simple, productivity is good, and torque detection is also possible. The purpose is to provide a simple torque detector.

An embodiment of the present invention will be described below with reference to FIG.

In Figure 2, 2 is the input shaft and 3 is the output shaft.

The input shaft 2 and the output shaft 3 are coaxially disposed via a movable gear 8 that is movable in the axial direction.

A linear spline is provided on one side 8b of the large diameter portion 81 of the movable gear 8, and a helical spline is provided on the other side 11B8cK. The helical splines of the output shaft 3 are meshed with the helical splines of the output shaft 3, respectively. The large diameter portion 81 of the movable gear 8 and the input shaft 2. 611 disc spring 9.10 between the output shaft 30 opposing end surface
are respectively mediated. It is supported by bearings 13 and 13 fixed to the input shaft 2 and output shaft housing 12, and the bearings 13 and 13tX exert a force YX in the radial direction, but have the ability to support some thrust direction as well. I have. The housing 12 is provided with a displacement sensor 11 that detects the displacement of the movable gear 8. Use the one that has been used by the trader for a long time. In addition.

In this embodiment, the countersunk 9. Instead of the IOK, the λ diameter portion 8& of the movable gear 8 may be moved by fluid pressure using a coil spring or a piston.

Next, the operation of the torque detector according to an embodiment of the present invention configured as described above will be explained.In the case of O torque or O, the input shaft 2, the output shaft 3, and the movable gear 8 are They rotate as one. When torque is applied, a torsional force acts between the input shaft 2 and the output shaft 3, and the movable gear 8 is pulled in or pushed out depending on the force applied to the helical spline, and the direction of the force is changed. is determined by the torque direction trap. When a force acts on the movable gear 8 in the direction in which the output shaft 3 pulls in, the movable gear 8 moves with a balance of 1, where the magnitude of the torque is balanced with the spring force due to the deflection of the spring 10.

Reverse direction - When torque is applied, the movable gear 8 is pushed out, and the spring force due to the deflection of the spring 9 and the force due to the torque are balanced 1
Then, the movable gear 8 moves in the opposite direction.

Previously, the amount of movement of the movable gear 8 could be detected by detecting the amount of movement of the movable gear 8.The amount of movement of the movable gear 8 could be detected using a displacement sensor 11, either contact or non-contact. It can be measured using either method.

In this embodiment, a disc spring is provided between the movable gear and the input shaft and the output shaft. In this way, the amount of displacement can be reduced and the response can be improved.In addition, in this invention, since a rotational phase difference is generated between the input shaft and the output shaft according to the torque, The phase difference may be detected by means similar to the conventional torque detector shown in Fig. 1.Furthermore, the linear spline and helical spline of the present invention can You can also set it up.

The movable gear may be made into a cylindrical shape, and a near spline may be provided on one of the circular and outer peripheral surfaces, and a helical spline may be provided on the other. As explained above, the torque detector of the present invention A linear spline and a helical spline are provided on the movable shaft placed between the output shaft and the -1 of these splines is meshed with the spline of the human power shaft and the other spline of the V output shaft, so that the axial direction The length is short and the structure is simple, and by changing the spring constant of the spring installed between the movable gear, input shaft, and output shaft, a wide range of torque detectors can be manufactured, making it easy to produce.

Furthermore, an ordinary displacement sensor can be used, and the electric circuit can be simple.

[Brief explanation of the drawing]

FIG. 1 is a side view of a conventional torque detector, and FIG. 2 is a side view of a torque detector according to an embodiment of the present invention taken in cross section. 2...Input shaft, 3...Output shaft, 8...Movable gear,
11...Displacement amount senna. In addition, the same reference numerals in the figure are Ii! 1l-v or O indicating the priest part Agent Shin Kuzuno- t 1 Illustration 2

Claims (2)

[Claims] (1) An input shaft and an output shaft are coaxially arranged to face each other via a movable gear, and the movable gear is provided with a linear spline and a helical spline, respectively.
m1 and the other of these splines are meshed with the splines provided on the input shaft and the output shaft, respectively, and the movable gear is positioned in the axial direction Kt" by a force trap of rotational torque,
A torque detector that detects torque based on displacement or strain. (2) The torque detector according to claim 1, which detects the rotational phase difference between the input shaft and the output shaft caused by the movement of the movable gear.