SU1229614A1 - Method of determining reduction gear efficiency - Google Patents

Abstract

The invention relates to the study of gearboxes for various purposes. The purpose of the invention is to simplify the process of determining the efficiency of the gearbox during mass production. For this purpose, a hydraulic system is used as a drive and a load driver V v4 Os 62, where the torques on the drive and the load are first measured according to the pressure in the pressure lines of the hydraulic system during operation of the reference gearbox, and then the same parameters are measured during operation the test gearbox, and the efficiency is determined by the formula. The reducer 1 is connected to the actuator 2 and the loader 3. The pressure hydraulic line 4 is connected to the pump 5 and the safety valve 6, which communicates 1 with the tank 7. At the output of the electric load 3, the drive motor 8 is connected. The pressure hydraulic line 9 is connected to the throttle 10 and the safety valve 11 Pressure in pressure lines 4 and 9 is determined by pressure gauges 12 and 13. 1 sludge. o (C (L //) j x n X irp

Description

1229614

The invention relates to the study of gearboxes for various purposes.

The purpose of the invention is to improve the accuracy and simplify the process of determining the efficiency of the gearbox during mass production.

cat

2m 2m, p, .w

M ,. .. p, .p.i

.P, -2t,

(four)

Then install the gearbox, the efficiency of which must be determined, the output t

The drawing shows a schematic diagram of the device for the implementation of the proposed method.

Gearbox 1 is connected to the drive 2, which serves as the hydraulic motor, and the loading unit 3, which is the pump. The pressure hydroline 4 of the motor 2 is connected to the pump 5 and the safety valve 6, the output of which communicates with the tank 7. The drive motor 8 is connected to the output of the pump. The pressure hydraulic line 9 of the pump 3 is connected to the adjustable throttle 10 and the safety valve 11 in parallel. The pressures in the pressure hydrolines 4 and 9 are determined with the help of pressure gauges 12 and 13. The required frequency of rotation of the test gear is set, the frequency of rotation of the drive engine 8 is changed, and the required load is due to the change of Cheney throttle 10.

Initially, a gearbox 1 is installed, the efficiency of which is predetermined with high accuracy, is rotated and, under certain operating conditions, pressure P is measured, and PJ in pressure hydraulic lines 4 and 9.

Mechanical, hydraulic motor 2j 1l, pump 3 and the known efficiency of the gearbox are equal

(1) (2) (3)

2m

where ,, mj, (and -

 -

The total of the motor 2 and the pump (1) - (3) is equal to

his work is done at the same cuttings and the pressure P, and P are measured in pressure lines 4 and 9.

Mechanical efficiency d, hydraulic motor 2 m, g pump 3 and the efficiency of the tested gearbox are

15

g irM,

 ° 17RG

(five)

20

-,

2 2- | GMG

(6)

2.Mj mH

(7)

Where

M

and LL - torques on the shafts of the motor 2 and the pump 3.

The mechanical efficiency of hydromotor 2 and pump 3 of expressions (5) - (7) is equal to

five

M. Lg Rg

(eight)

 a, H «-Р From the equality of relations (4) and (8) we find the efficiency of the tested reducer Р-p

- 2

Y (9)

S

and

which is defined with a relative error

. S, j -tl | 6 J ,. S p. 8J, 8p, S;, (10)

where (5p P Pg rela tive error of measurement of pressure P,, P,, is a relative error in determining the efficiency of the gearbox.

 pressures P, and P,, P and P will differ greatly among themselves, which can mainly take place under the conditions of the same test conditions only if the gearbox under test does not have a good quality; a correction factor K should be entered into formula (9), taking into account the deviations of the mechanical Efficiency of the hydraulic motor 2 and pump 3.

by this

rk

) .r h

2u,

Where

mechanical efficiency of the hydraulic motor 2 at pressures P, and P; mechanical efficiency of pump 3 at pressures P2 and P.

During the tests, the temperature of the working fluid must be kept constant, and the pressure in the drain line of the hydraulic motor 2 and in the suction line of the pump 3 should differ little from the atmospheric one. In order to improve the accuracy of determining the efficiency of the reducer, instead of the pressure gauges 12 and 13, differential pressure gauges can be installed in the circuit, determining the differential pressure across the motor 2 and the pump 3.

Claims (1)

Invention Formula The method of determining the efficiency of the gearbox, which consists in measuring the torque on the drive of the gearbox and its load, followed by a calculation. N. Yatsol Editor Order 2444/41 Compiled by M. Pakhomov Tehred N. Bonkalo Proofreader E. Roshko Circulation 778.Subscription VNIIPI USSR State Committee for inventions and discoveries 113035, Moscow, Zh-35, Raushsk nab., 4/5 Production and printing company, Uzhgorod, Projecto st., 4 229614ts efficiency with respect to mathematical dependence, it is the fact that, in order to increase accuracy, a hydraulic system is used as a drive and a loader, and the torques on the drive and the loader are first measured according to the pressure in the hydraulic system pressure lines then the same parameters are measured when the tested gearbox is operated, and the gearbox efficiency is calculated by the formula R, R. ten 15 " PZ-P; 0 five where H - the efficiency of the test gear; C - the efficiency of the model gear; R. R. P is the pressure in the pressure line of the actuator during the operation of the model gearbox; pressure in the pressure line of the load when the model reducer is operating; pressure in the pressure line of the drive during operation of the gearbox under test; P, - pressure in the pressure line thirty . The load when the test gear is operated.