SU1516634A1 - Test bed for hydromechanical transmission - Google Patents

Abstract

The invention can be used in tests of hydromechanical gears of automobiles. The purpose of the invention is to increase the productivity of tests by reducing the time for processing test results. The drive motor 1 and the brake device 2 are connected by means of two cardan shafts 3.4 to the test hydraulic transmission 5. The pulse modulators (M) 6, 7, 8, 9 are fixed with respect to the shafts 3.4 and interact with the gear metal disks 10, 11 , 12, 13 mounted on the flanges 14, 15, 16, 17 of the shafts of the engine 1 of the device 2 and transmission 5. Each of the contactless transducers (P) 18, 19, of the twisting moment is made up of adders 20, 21 connected in series with each other converter 22, 23 current and measuring device (PI) 24, 25. The adder 20 two of its inputs are connected with M 6.7, adder 21 with M 8.9. Each of P 26, 27 includes pulse generator 28, 29 connected in series, current P 30, 21 and (PI) 32, 33. Shaper 28 is connected to M 7, driver 29 is connected to M 8. Resistance shops, amplifier 32 and divider 33 are installed between P 23 and IP 25, IP 25 includes a switch 34, connected in series with the resistance box 35 and installed in one of the arms 36 of the divider 33 parallel to the IP 25. An amplifier 32 is installed between P 31 and IP 37 and contains a switch 34, sequentially connected entered with the store 38 and connected to the collector circuit 39 amplifier 32. The number resistance in stores 35, 38 corresponds to the number of gears. 1 il.

Description

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2 - Shchg - -, t - St-t -JTC-J 5

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The telemeter device (PI) 2, 25. The adder 20 connects its two inputs to M 6, 7, the adder 21 to M 8.9. Each of P 26,27 includes pulse generator 28, 29 connected in series, current П 30, 21 and ИП 32, 33. Driver 28 is connected to М 7, driver 29 to М 8, Resistance Shops, amplifier 32 and divider 33 are installed between P 23 and IP 25. IP 25 includes a switch,

serially connected to the resistance box 35 and mounted in one of the arms 36 of the divider 33 in parallel with the PI 25. Amplifier 32 is installed me and P 31 and IP 37 and contains a switch 3 connected in series with the magazine 38 and connected to the collector circuit 39 of the amplifier 32. The number of resistances in stores 35, 38 corresponds to the number of gears. 1 il.

The invention relates to automotive engineering and can be used in tests of hydromechanical gears of automobiles.

The purpose of the invention is to increase the productivity of tests by reducing the time for processing test results.

The drawing shows the layout of the test bench for hydromechanical transmissions.

Designations adopted in the drawing: M, M are the torques at the input and output shafts of the hydromechanical transmission; P, P - the number of revolutions of the input and output shafts of hydromechanical transmission. The test bench contains a drive motor 1 and a braking device 2, connected with two camshafts 3 and to the hydromechanical gear 5 under test, four pulse modulators 6–9, fixedly fixed relative to the cardan shafts 3 and interacting with gear metal discs 10-13 mounted on the flanges of the shafts (not indicated) of the drive motor 1, the braking device 2 and the test hydromechanical transmission 5, the first and second contactless transducers 18 and 19 of torque, each of which are made as connected successively between themselves adder 20 (21) of current transducer 22 (23) and measuring device (25), and adder 20 of first torqueless contactless transducer 18 is connected with its two inputs (not labeled) with corresponding the first and second pulse modules

0

five

O 5 o w o

five

6 and 7, and the adder 21 of the second non-contact converter 19, respectively, with the third and fourth pulse modulators 8 and 9, two contactless converters 26 and 27 of the rotation frequency, each of which includes connected in series shaper 28 (29) pulses, converter 30 ( 31) a current and a measuring device 32 (33) wherein the driver 28 of the pulses of the first frequency converter 26 is connected to the second pulse modulator 7, and the driver 29 of the pulses of the second converter 27 of the rotation frequency is connected to the third imp module modulator 8.

I

The stand is equipped with two shops.

resistors, an amplifier 32 and a voltage divider 33 installed between the current converter 23 and the measuring device 25 of the second torque converter 19, including a switch 3 connected in series with the resistance box 35 and installed in one of the arms 36 of the voltage divider 33 25. An amplifier 32 is installed between the current converter 31 and the measuring instrument 37 of the second rotational frequency converter 27 and comprises a switch 3, in series with the magazine SG 38 and the resistances connected to the collector circuit 39 of amplifier 32, the number of resistors (not labeled) of the second converters 19 and 27, the torque and the rotational speed corresponding to the number of the test transmission hydromechanical transmission.

The test bench works in a special way.

The drive motor 1 and the brake device 2 establish a predetermined test mode of the hydromechanical transmission 5, in which one of the gears, for example the second one, is engaged. The input torque is measured by the first non-contact torque converter 18. At the same time, the rectangular voltage pulses obtained at the output (not indicated) of the pulse modulators 6 and

7 when passing through their cuts toothed metal discs 10 and 11 mounted on the flanges T and

15, respectively, rotating together with the drive shaft 3, are subtracted from each other by the adder 20 and converted by the current converter 22 to a direct voltage voltage proportional to the torque M on the shaft 3 "This voltage is measured by a measuring device 2k,

The frequency of rotation of the shaft 3 is measured by the first contactless transducer 26 or 27 of the rotational speed, the pulse shaper 28 and the current transducer 30 converting the rectangular pulses from the second pulse modulator 7 into a DC voltage. This voltage is proportional to the frequency of rotation of the shaft 3 and varies with a measuring instrument.

Torque M (not indicated) hydromechanical. Transmission 5 Dimension C to the second 19 non-contact torque converter. In this case, the rectangular voltage pulses obtained from pulse modulators

811 9, due to the passage through their cuts, the toothed disks 12 and 13 mounted on the flanges 1b and 17 are rotating, together with the drive shaft 4, are subtracted from each other by the adder 21 and converted by the Current Converter 23. to the voltage and, the torque proportional to the transmitted shaft k M. M. The voltage divider 33 to the measuring device 25 is energized

g

equal to

and.

U1

to „g

TO

ni

the transfer ratio of the divider 33 in the second position of the switch 3, set

five

new in one f; neue 36 voltage divider. Since the transmission coefficient Kg ,, splitter 33 is established by means of a resistance box 35 in accordance with the value of the transmitted number of the second gear of the tested hydromechanical transmission 5, the voltage and 2 at the output of the divider 33 correspond to the torque M on the torque converter turbine (not shown ) the tested hydromechanical transmission 5, taking into account the efficiency of its mechanical gear (not shown), i.e.

M Y- I,

where M- is the torque at the output of the tested hydromechanical transmission S M is the torque at the turbine

torque converter of the tested hydromechanical transmission S;

1 is the gear ratio of the second transmission of the tested hydromechanical transmission 5. The frequency of rotation of the cardan shaft is measured by a second contactless transducer 27 of the rotation frequency, the pulse shaper 29 and the current converter 31 convert the square pulses from the third pulse modulator 8 to the DC voltage 5 U proportional to the frequency of rotation of the propeller shaft. And from the output of the amplifier 32 to the measuring device 37 is supplied for example 0

five

0

and

four

equal to

U4

from to,,,

TO

VI

the gain of the amplifier 32 at the 2nd position of the switch 40 installed in the collector circuit 39 of the amplifier Zb,

Since the amplification factor of the amplifier 32 is set by the resistance magazine 38 in accordance with the gear ratio of the second gear of the tested hydromechanical transmission 5, the voltage on the amplifier 32 corresponds to the rotation frequency P, of the torque converter turbine of the tested hydromechanical transmission 5, i.e.

Fri g - g

where n is the frequency of rotation of the exhaust

the shaft (cardan shaft) of the tested hydromechanical transmission 5; n - turbine rotation frequency

the torque converter of the tested hydromechanical transmission 5i

I - gear ratio, for example, the second transmission of the tested hydromechanical transmission 5.

Claims (1)

Invention Formula Test bench for hydromechanical transmissions, containing a drive motor and a braking device, connected by means of two cardan shafts to the hydromechanical gear under test, four pulse modulators fixed stationary relative to the cardan shafts and interacting with gear metal discs mounted on the flanges of the drive motor brakes devices and test hydromechanical transmission, the first and second contactless torque converters, each of which you olnen as associated in series between an adder and a current converter measuring device, wherein the first adder contactless torque transducer its two inputs coupled to respective first and second pulse modulators, and a second adder contactless transducer - respectively five 0 five 0 five 0 but with the third and fourth pulse modulators, two non-contact rotational frequency converters, each of which includes connected in series a pulse shaper, a current converter and a measuring device, the pulse shaper of the first speed converter being connected to the second pulse modulator, and the second pulse shaper a speed converter is connected to a third pulse modulator, characterized in that, in order to increase the test performance, t reduce the time for processing test results; the stand is equipped with two resistance stores, an amplifier and a voltage divider, installed between the current converter and the measuring instrument of the second torque converter, which includes a switch connected in series with the resistance magazine and installed in one of the voltage divider arms parallel to the measuring device, an amplifier is installed between the current transducer and the measuring instrument of the second frequency converter It contains a switch connected in series with the resistance box and connected to the amplifier's collector circuit, the number of resistances in two resistance stores of the second torque and rotation frequency converters corresponding to the number of gears of the hydromechanical transmission under test.