Created on:2021-06-16 09:46

Test equipment and conditions for low speed and high torque hydraulic motor

Test equipment and conditions for low speed and high torque hydraulic motor

① Test circuit. The principle of test circuit is shown in Figure W.

W.jpg

② Measuring point position

a. Pressure measuring point: set at (2-4) d (D is the pipe diameter) from the inlet and outlet of the tested motor. During the test, it is allowed to move the measuring point further away from the tested motor, but the pressure loss of the pipeline must be considered.

b. Temperature measurement point: it is set at a distance of (2-4) d (D is the pipe diameter) from the pressure measurement point, which is further away from the tested motor than the pressure measurement point.

c. Noise measurement points: the location and quantity of measurement shall be in accordance with 6.5 of GB 3767-83.

③ Test oil

a. Viscosity: the kinematic viscosity at 40 ℃ is 42-47mm2gs (special requirements are specified separately).

b. Oil temperature: unless otherwise specified, the type test shall be conducted at (50 ± 2) ℃ and the factory test shall be conducted at (50 ± 4) ℃.

c. Cleanliness grade: the solid particle pollution grade code of test oil shall not be higher than 19 / 16.

④ Steady state condition. When the variation range of the average display value of each parameter meets the requirements in the table below, it is a steady-state condition. The parameters (pressure, flow, torque, speed, etc.) of each set point should be measured at the same time under steady-state condition.

 

Change range of display value

Measurement parameters

测量准确度等级

A

B

C

压力(表压力p<0.2MPa)/kPa

±1.0

±3.0

±5.0

压力(表压力p≥0.2MPa)/%

±0.5

±1.5

±2.5

流量/%

±0.5

±1.5

±2.5

转矩/%

±0.5

±1.5

±2.0

转速/%

±0.5

±1.5

±2.0

Note: the type test shall not be lower than class B measurement accuracy; the factory test shall not be lower than Class C measurement accuracy.

⑤ Measurement accuracy. The measurement accuracy is divided into a, B and C levels. The allowable system error of the measurement system is shown in the table below.

 

Allowable system error of measurement system

测量参量

测量准确度等级

A

B

C

压力(表压力p<0.2MPa)/kPa

±1.0

±3.0

±5.0

压力(表压力p≥0.2MPa)/%

±0.5

±1.5

±2.5

流量/%

±0.5

±1.5

±2.5

转矩/%

±0.5

±1.5

±2.0

转速/%

±0.5

±1.0

±2.0

温度/℃

±0.5

±1.0

±2.0

Note: the type test shall not be lower than class B measurement accuracy; the factory test shall not be lower than Class C measurement accuracy.

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