SU916796A1 - Apparatus for measuring kinematic error and lost motion of couplings - Google Patents

Description

The invention relates to mechanical engineering.

A device for measuring the kinematic error of the couplings is known, comprising a housing, two shafts rotating relative to the housing, onto which the leads of the coupling to be tested are mounted. The kinematic error is measured by photoelectric and pulsed optical sensors (.1).

However, the device is characterized by low measurement accuracy. The position of the shafts with the checked coupling is determined by the strokes of the input and output limbs projected onto the film or screen, and the offset of the strokes on the film or screen must be translated into a specific angular value of the kinematic error in scale, which reduces the accuracy of the reference.

The closest to the proposed results achieved is

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a device for measuring the kinematic error and dead stroke of the couplings, comprising a housing in the form of a base and a bracket, mounted on an arm a sleeve with an eccentric hole, a shaft kinematically connected with a drive, mounted on bearings in a sleeve, a center placed coaxially to the shaft, and a collimator, as well as a mirror mounted on the shaft [2].

The device allows you to shift the shaft, set the load and measure with great accuracy the angle of rotation of the shaft. However, the test conditions do not correspond to the actual operating conditions of the couplings during the transmission of rotation, which leads to a significant error in determining the kinematic error.

The purpose of the invention is to improve the accuracy of measurement by creating conditions close to operational.

This goal is achieved by the fact that in the device for measuring

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kinematic error and dead stroke of couplings, comprising a housing in the form of a base with a bracket, an adapter sleeve with an eccentric bore mounted on the bracket, a shaft mounted kinematically with the drive, mounted on bearings in the sleeve, a center aligned coaxially with the shaft, and a collimator, as well as a mirror, mounted on the shaft, the bracket is made rotatable relative to the base, and the sleeve is rigidly connected to the base.

₍ The drawing shows the proposed device.

Device for measuring the kinematic error and the dead stroke of the couplings, contains the base 1 and, bracket 2, mounted on the glass 3 and rigidly bonded to it. Sleeve 4 with eccentric bore 5, mounted on bearings 6 in glass 3 and rigidly fastened with one end e base 1, shaft 7 mounted on bearings 8 in sleeve 4 and kinematically connected with the drive, center 9, placed coaxially to shaft 7, collimator 10 and a mirror 11 mounted on the shaft 7, as well as a drive consisting of gears 12 and 13 mounted respectively on the shaft 7 and the torsion shaft 14. The torsion shaft 14 is rigidly fixed at one end in bracket 2, and the other end 15 is mounted on bearings 16 and can twist around its axis , while at the end 15 of the shaft 14 is installed a lever 17 with a latch 18 spring-loaded spring 19.

The gear 13 has holes 20 located circumferentially in both directions from the zero position, and there are risks against the holes 20 indicating the magnitude of the load, and the end of the clamp 18 interacts with the holes 20, with the center 9 fastened to the bracket 2 with a screw 21, and the end of the center 9 and the end of the shaft 1 are installed leashes 22 and 23, bearing the checked coupling 24.

The device works as follows.

In the initial position, the shaft 7 is fixed (the retainer is not shown in the drawing). The collimator 10 and the mirror 11 are in the zero position. When the device locks (not shown in the drawing) is disengaged from the bracket 2 and the shaft 7 receives rotation from the tested coupling 24. On the shaft 7, the torsion shaft 14 sets the load in the form of torque.

To do this, the latch 18 is removed from the hole 20 and the lever 17 rotates the end 15, the torsion shaft 14 twists at a certain angle, creating a torque. When this gear 13 remains in place, as it is installed at the end 15 freely and coupled with the gear 12. The latch 18 is inserted into one of the holes 20 and held there by a spring 19, fixing the lever 17. The torsion shaft 14 through the end 15, the lever 17 and the latch 18 creates a torque on the gear 13, from which the moment is transmitted to the gear 12 shaft 7 and the clutch 24. Since the magnitude of the torque depends on the twisting angle of the torsion shaft 14, then turning the lever 17 and engaging the latch 18 with one of the holes 20, sets certain load by magnitude and nap ION val.7 on and checks the clutch 24. Moreover, the required load - is constant regardless of the rotation or rotation arm 2, since the torsion shaft 14 with one end fixed to the bracket 2 and rotates together with it, and the twist angle of the torsion bar 14 remains unchanged. The rotation of the bracket 2 occurs together with the center 9 fixed in it and transmitted through the checked coupling 2'4 to the shaft 7. With the help of the collimator 10 and the mirror 11, the mismatch of the rotation of the center 9 and the shaft 7 is measured

The mismatch angle of rotation of the center 9 and shaft 7 depends only on the state of the tested coupling 24 and is equal to the kinematic error of this coupling at a given angle of rotation and a given load.

To determine the kinematic error of the couplings during the transmission of rotation. the device is set to its original position at small angles. On the shaft 7, the lever 17 sets the required load in magnitude and direction, the bracket 2 rotates at a given angle of rotation of the coupling, which is measured on a scale of 25, the center 9 also rotates with it, and through the checked coupling 24 rotates the shaft 7. With the help of the collimator 10 and mirrors 11 measured

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misalignment angle of rotation. The angle of mismatch is the kinematic error of the tested coupling 24.

To determine the dead stroke of the coupling device is set to 5 the original position.

The lever 17 sets the required torque to the shaft 7 and the checked coupling 24. The reading of the angular position of the shaft 7 is removed by the coplimator 10 and the mirror 11. The rotation of the lever 17 sets the torque opposite to the first one. The countdown of the angular position of the shaft 7 is removed. The difference in the readings of the collimator 10 is 15 the dead stroke of the coupling 24 being checked.

To determine the maximum kinematic. error of the couplings during rotation of the device is set to ₂₀ to its original position. Moreover, the device is installed on a rotary table (not shown in the drawing). The lever 17 sets the required torque to the shaft 7 and the coupling to be checked 24. ₂₅ The turntable is set to rotate, and the bracket 2 with the collimator 10 is held in place. The rotation of the center 9 and the shaft 7 occurs relative to the base 1, i.e. ₃₀ but their relative bearing surfaces. According to the collimator 10, an indication of the misalignment of the rotation of the center 9 and the shaft 7 is taken with the coupling half of the coupling 24. fixed in them. ₃₅

The magnitude of the mismatch of the rotation of the center 9 and the shaft 7 is the kinematic error of the checked coupling during rotation.

The proposed device allows to improve the measurement accuracy of the kinematic error of the clutches in conditions close to operational, by eliminating errors from the test conditions and to get more complete characteristics of the tested clutch when transmitting rotation at small angles, with continuous rotation, as well as to measure the dead run of the clutch B provisions.

Claims (1)

Claim A device for measuring kinematic error and dead stroke of couplings, comprising a base housing with a bracket, a sleeve with an eccentric hole mounted on the bracket, a shaft kinematically connected to the drive, mounted on bearings in the sleeve, a center aligned coaxially with the shaft, and a collimator, and also a mirror mounted on the shaft, characterized in that, in order to improve measurement accuracy by creating conditions close to operational, the bracket is made rotatable around the axis of the shaft relative to the base, and ka is rigidly connected to the base.