RU2270424C2 - Gravitational torquemeter - Google Patents

Abstract

FIELD: the invention refers to measuring arrangements and may be used for measuring of a torsion torque.

SUBSTANCE: the arrangement has a counterbalance and a clam connected with the counterbalance with flexible ties fixed on the periphery of the cam. The cam has two different branches of the spiral of Archimedes having various increasing coefficients of the radius of the spiral.

EFFECT: increases the diapason of measurements of rotational moments.

2 dwg

Description

The invention relates to the instrument industry and can be used to measure torque on shafts, for example, electric motors.

Known momentometers based on the static measurement method, in which the torque on the shaft is determined at a steady speed of rotation of the shaft. These momentometers have three main varieties: brake, drive, transmission. The simplest and most common are brake momentometers, which combine a braking device, which loads the tested engine with braking torque, and a measuring unit, which is necessary to measure this moment. Measuring units of various types are used: pendulum, torsion, link, compensation (Potapov L.A., Yuferov F.M. Measurement of torques and rotational speeds of microelectric motors, M., Energy, 1974).

A new type of gravitational momentometers is being developed (AS USSR No. 1719938, publ. 15.03.92, bull. No. 10).

However, for all these momentometers, the scale is symmetrical with respect to the start of measurements, which under certain conditions can be a drawback and limit the measurement range and the scope of the momentometers.

Closest to the proposed are electromagnetic braking torque meters, including a non-magnetic disk, an electromagnetic system and a measuring unit with a scale, arrow, flange, cam and counterweight, connected to the cam by means of flexible coupling (AS USSR No. 1719938, published on March 15, 1992 Bulletin No. 10)).

In the indicated momentometer, the scale is also symmetrical, which limits its possibilities, since in practice the torques of different types of electric motors are often measured, which have different directions of rotation and different ranges of torque changes.

The purpose of the invention is to increase the measuring range of the momentometer, expanding its capabilities.

This goal is achieved by the fact that the cam is made of two branches of an Archimedean spiral having different coefficients of increasing the radius with increasing angle of rotation.

r ₁ = l ₀ + k ₁ φ, r ₂ = l ₀ + k ₂ φ, l ₀ ≥0, k ₁ = k ₂ ,

where r ₁ is the equation of one branch of the cam,

r ₂ is the equation of another branch of the cam,

l ₀ is the shortest distance from the axis of rotation of the cam to the place of attachment of the flexible connection,

k ₁ - coefficient of increase in radius r with increasing angle of rotation,

k ₂ - coefficient of increase in radius r with increasing angle of rotation,

φ is the angle of rotation of the radius of the Archimedean spiral.

Figure 1 shows a momentometer, front view; figure 2 - characteristic of the momentometer.

On the base 1, a bracket 2 is fixedly fixed with a scale 3, a pointer arrow 4, and a cam 5 consisting of branches 6 and 7 of an Archimedean spiral with a counterweight 8 at the end of a flexible connection 9, the other end of which is fixed to the profile surface of the cam 5.

Momentomer works as follows.

Under the action of the measured torque on the axis O counterclockwise, the cam 5 comes into rotation, as a result of which the flexible coupling 9 is wound on the branch 6 of the cam 5 and creates a counteracting moment. If the measured and opposing moments are equal, the rotation will stop and the arrow will show the value of the applied torque on the scale.

Similarly, the torque meter works with the action of torque clockwise. However, in this case, the branch 7 of the cam 5 will be activated.

In the claimed technical solution, the use of a cam, consisting of two branches of an Archimedean spiral with different coefficients of increasing the radius with an increase in the angle of rotation, is a new feature. Therefore, this distinguishing feature gives reason to consider the claimed technical solution in accordance with the criterion of "novelty."

The proposed solution for a specialist does not explicitly follow from the prior art.

Based on the foregoing, we can conclude that the claimed technical solution meets the conditions of patentability of the invention:

- is new, as it is not known from the prior art;

- has an inventive step;

- industrially applicable.

Claims (1)

Gravity momentomer containing a counterweight and a cam connected to the counterweight by means of a flexible connection fixed on the periphery of the cam, consisting of equal branches of the Archimedean spiral, characterized in that the branches of the Archimedean spiral have different radius increase coefficients with increasing angle of rotation: r ₁ = l ₀ + k ₁ φ, r ₂ = l ₀ + k ₂ φ, l ₀ ≥0, k ₁ = k ₂ , where r ₁ is the equation of one part of the cam, g ₂ - the equation of the other part of the cam, l ₀ is the shortest distance from the axis of rotation of the cam to the place of attachment of the flexible coupling; k ₁ - coefficient of increase in radius r ₁ with increasing angle of rotation, k ₂ - coefficient of increase in radius r ₂ with increasing angle of rotation, φ is the angle of rotation of the radius of the Archimedean spiral.

Images