DE1801956A1 - Method and arrangement for measuring the irregularity of gears with a small transmission ratio - Google Patents

Description

Method and arrangement for measuring non-uniformity of gears with a small gear ratio

ratio

The present invention relates to a method and an arrangement for measuring the irregularity or inaccuracy of small gear ratios in the range from 1: 8 to 8: 1.

Measuring the irregularity or inaccuracy of small gear ratios of gearboxes with gear ratios in the range of

1: 8 to 8: 1 using spur or I-bevel gears is a difficult problem in measuring technology,

The course of the irregularity of the transmission ratio is through the course of the so-called kinematic error given. To measure the error, there are deviations in the existing transmission ratio of an ideal of the same size

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to deliver. These deviations are in arc seconds or measured in micrometers.

Existing methods of measuring irregularity small over-the-counter ratios are based on the seismic, mechanical or optical principle. They have a number of drawbacks that make up their general Prevent application.

The method of the invention for measuring non-uniformity small gear ratios is that the required result through Subtracting the measurements of two major gear ratios obtained in a known manner be made.

The essence of the invention is based on an exemplary embodiment shown schematically in the drawing an arrangement for measuring the non-uniformity of the transmission ratio in the case of one-sided shifting of spur gears explained in more detail. Show it:

Pig. 1 shows an arrangement for measuring the non-uniformity with spur gears.

Pig. 2 the design of the measuring devices on the slow and fast gear part.

Pig. 3 is a block diagram of a measuring device according to Pig. 1.

Pig. 4 schematically shows an arrangement for setting the sensitivity of both measurement paths.

909826/0839 " ³ ~ BATH ORIGINAL

In the arrangement of FIGS. 1 and 2, the gears 2 and 3 to be measured are mounted on the frame 1. The gear wheel 2 is driven by the electric motor 5 via a worm gear 4. On the shafts of the gears 2,3 known measuring devices 6,7 are provided for measuring the slow gear part. On the shaft of the worm gear 4 and on the auxiliary gear with the gears 10, 11, two heating devices 8, 9, known per se, are provided for the high-speed gear part.

In Pig. 2 shows a known measuring device 6 or from FIG. 1 for the slow transmission part. A disk 14, which is driven by an electric motor 17, is rotatably mounted on the shaft of the worm wheel 12 of the worm gear 4. On the disk 14 there are two identical magnetic records or gears, which z _1t - = z.,

TP Id contain magnetic waves or teeth. The number of magnetic waves is ¹ equal ^{to the transmission ratio ~ z} i5 ^{= z} i6 = i / · kit of one of the recordings or the gears, a fixed playback head (magnetic head) 15, which is connected to the gear frame 1, works together with the second recording a rotatable playback head 16 connected to the worm wheel 12 *

The letting device on the high-speed gear part forms a known two-phase, two-pole selsyn device or 9

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-A-

Mg. 3 represents a block diagram of the electronic part of the measuring device. You. consists of phase meters 18, 19, a sensitivity compensator 20, a mixer 21, a tilter 22 and a recorder 23.

The gear ratio of the auxiliary gear by means of the gears 10, 11 is equal to the measured transmission ratio

^Z 2 _ ^Z 1O ^Z 3 " ^Z 11

Bas it follows that the arrangement consists of two arrangements 6-8 and 7-9 for measuring two constant gear ratios of the same size. " The size of this large gear ratio is determined by the size of the gear ratio of the Worm gear 4 given.

The arrangement 6-8 measures non-uniformities of the Worm gear 4.

The arrangement 7-9 measures irregularities of the transmission ratio Z ^ q / Z .... of the auxiliary gear, the irregularities of the worm gear 4 and the irregularities of the transmission ratio Z ₂ / Z of the measured transmission.

Subtracting the information from these two arrangements eliminates the non-uniformity of the

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Worm gear 4. Assuming that the gear ratio Z ₁₀ / Z ₁₁ 'of the auxiliary gear is ideal, which can also be achieved with normal wheels, since their errors in the gear ratio of the worm gear 4 are reduced, the difference between the two results of the two arrangements gives the course of Irregularity of the gear ratio Zn / Z of the measured gear.

For the purpose of correct elimination of the influence of the accuracy of the worm gear 4, it is necessary to set the sensitivity Cg_ ₈ and Ογ_ς of both measuring paths in the ratio of the transmission ratio:

° 6-8 ^Z 2

^c 7-9 p

This is done by the sensitivity equalizer 20 achieved. The phases of the frequencies of the measuring devices 6-8 are compared in the phase meter 19, the Phases of the frequencies of the measuring devices 7-9 im Phase meter 19 · In the sensitivity compensator 20 the details of the phase meter 18 are reduced in the ratio of the transmission ratio Zp / Z. In the mixer 21, the information from both phase meters 18, 19 is subtracted by means of the filter 22 filtered and registered by a recorder 23.

The adjustment of the sensitivity compensator 20 is carried out according to the invention according to FIG.

The worm shaft is decoupled at point A _{909826/0839 _ 6} _

and the measuring devices 8, 9 are given a slow oscillating movement by means of a special electric motor 24 granted (for example with a frequency of 1 Hz and oscillation over 90 °).

The sensitivity equalizer is set during this oscillation 20 in such a way that the data from the recorder 23 is constant. This is a correct subtraction of the data from both measurements is ensured.

According to the invention, measurements of the non-uniformity Smaller gear ratios can be made that are very accurate, reliable and universal are applicable. They are mainly used to measure the accuracy of gears with one-sided generation suitable which method is considered the best method for quality control and classification can be.

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Claims (1)

Patent claims: Method of measuring the inaccuracy smaller Transmission ratios of gearboxes, characterized in that that two measurements of the inaccuracy of gearboxes are made with a large transmission ratio, the details of which are subtracted. Arrangement for performing the method according to claim 1, characterized, that a drive (5) of the gear (2,3) to be measured is provided via a gear (4) with a large gear ratio and a further auxiliary gear (10,11) with the same gear ratio as the gear to be measured (2,3) to the Gear (A) is coupled with a large gear ratio, measuring devices (6,7,8,9) being provided on each of the gear parts (2,3f1O, 11) for evaluating their movement and subtracting their data. Arrangement according to claim 2,
characterized, that a sensitivity compensator (20) of the information the measuring devices (6-8 and 7-9) are provided in front of the device for subtracting their data is. - 8 909826/0839 Arrangement according to claim 3 »
characterized, that a special drive (24) of the auxiliary gear (10,11) is provided, which this auxiliary gear (10,11) an independent slow oscillating Movement transmitted and a balancing of the sensitivity of both indications of the measuring devices (6-8 and 7-9) made possible by means of the sensitivity compensator (20). 909826/0839 Blank page