SU1283580A1 - Bed for testing transmissions with stageless control - Google Patents

Abstract

The invention relates to mechanical engineering, in particular to testing equipment, and can be used to study the limiting operating conditions of continuously variable transmissions with an open loading circuit. The aim of the invention is to expand the functional possibilities of the stand by the possibility of determining the limits of the speed-limiting control mode during operation.

Description

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the entire range of gear ratios of various types and sizes of continuously variable transmissions without destroying them. The operating modes of the stand are set by an analog computer 19, which, in accordance with a predetermined program, supplies control signals to thyristor-driven electric drives 21, 20 and 22, provides corresponding changes in the speeds of the adjustable drive 1 and control 14 of the motors, as well as the change in the torque generated by the adjustable loader 11 for all gear ratios of the tested infinitely variable gear 7. The change in torque is made by strain-sensing devices 5, 9 and tensor ftoy 18, and angular velocity - tachogenerator 2, 15 and tachometer 13 chislovm with recording high-recorders 23 and 24. Adjustable safety clutches 3, 16 eliminate the possibility of fracture ispytue - my transmission 7 and stand elements 1 yl.

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The invention relates to mechanical engineering, in particular to testing equipment, and can be used to study the limiting operating conditions of continuously variable transmissions with an open load circuit.

The aim of the invention is to expand the functionality of the stand by the possibility of determining the limit of the speed-limiting control mode over the entire range of gear ratio variations of various types and sizes of continuously-variable gears without their destruction.

The drawing shows a stand, a general scheme.

The stand contains a drive motor 1 with a built-in tachogenerator 2, the first adjustable safety 3 and compensatory 4 couplings, connecting the output shaft of the engine 1 with a strain-sensitive device 5, still on the drive shaft of the test drive of the continuously variable transmission 7, connected with its slave shaft throughput mercury current collector 8, strain gauge-sensitive device 9, gear compensation sleeve 10, which is connected to the output shaft of an adjustable loader 11, for example, powder electromagnet o brakes with a sensitive device 12 and a numerical tachometer 13, adjusting

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control motor 14, for example, a high-torque direct current motor with an integrated tachogenerator 15, which is connected via the second adjustable safety 16 and double cross-coupling 17 to the tension coupling 18 mounted on the adjusting shaft of the test transmission 7.

The bench is controlled by an analog computer 19, connected via thyristor-driven electric drives 20, 21 and 22, to an adjusting control motor 14 and regulated by a drive motor 1 and a loader 1, respectively. Recording equipment, such as high-frequency recorders 23 and 24, are associated, respectively, with tachogenerators 2 and 15 of tenzal 6 and current collector 8, numerical tachometer 13, tensomuff 18.

The stand works as follows.

On the analog computer 19, in accordance with theoretical and empirical dependencies, the laws of voltage changes are accumulated, supplying which to the input of thyristor motor-driven devices 21, 20 and 22 provide a corresponding change in the speeds of the driving 1 and adjusting 14 motors, as well as the torque variation, adjustable load loader I1 for all gear ratios of the test- ing, infinitely variable transmission 7. 7. The change in torque

on the drive, slave and adjustment shafts of the test gear 7 is measured by the stress-sensitive devices 5 and 9 and tensomufta 18, and the readings of tensed 6, the current collector 8 and the tensomes 18 are recorded by high-frequency recorders 23 and 24, which also carry out continuous recording of tachogenerator 2 and 15 and a numerical tachometer 13 angular speeds of the driving, driven and adjusting shafts of the tested gear 7. Adjustable safety clutches 3 and 16 with a pre-set limit torque give the opportunity without destroying the tested infinitely variable gear 7 or stand elements, it is possible to determine experimentally for the entire control range the speed and acceleration limit when the gear ratio of the gear 7 changes over the entire control range at different speeds of the drive shaft and the control power in the speed limit mode .

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Claims (1)

The claims of the invention and the test stand for infinitely variable transmissions, comprising a controllable drive motor, tense sensors, designed to be mounted on the driving and driven shafts of the test gear, control loader, control motor control, analogue computer and recording equipment, different the fact that, in order to expand the functionality, capabilities, it is equipped with a tensomufta designed for installation on the adjusting shaft, adjustable safety clutches, one of which is located between the drive motor shaft and the strain-sensitive device of the drive shaft of the test gear, and the other between the control shaft of the control motor and the tension coupling and thyristor electrically-driven devices connecting the analog computer with the control motor of the control and the adjustable drive motor and the loader.