Created on:2021-06-08 10:38

Test method parameters of low speed and high torque hydraulic motor

Test method parameters of low speed and high torque hydraulic motor

(1) Scope. This standard specifies the structural types, basic parameters, technical requirements, test methods, inspection rules, marks and packaging of five low-speed and high torque hydraulic motors, i.e. inner curve radial piston motor, crankshaft connecting rod radial piston motor, crankshaft connecting rod radial piston motor, radial steel ball motor and double swashplate axial piston motor.

This standard is applicable to five structural types of low-speed high torque hydraulic motors with hydraulic oil or other mineral oil with equivalent performance as medium, namely, inner curve radial piston motor, crankshaft connecting rod radial piston motor, crankshaft connecting rod free radial piston motor, radial steel ball motor and double swash plate axial piston motor. Other types of low speed and high torque hydraulic motors can be used as reference.

(2) Definition. This standard adopts the following definitions.

① Rated pressure. Pressure under rated condition.

② No load pressure. No more than 5% of rated pressure or 0.5MPa input pressure.

③ Rated speed. Under the condition of rated pressure and specified back pressure, it can operate continuously and guarantee the maximum speed of design life.

④ Minimum speed. The minimum speed that can keep rated pressure and run continuously.

⑤ Displacement. Volume of fluid drawn in or discharged per stroke or cycle.

⑥ No load displacement. Input displacement measured from two different speeds and specified minimum working pressure.

⑦ Rated working condition. Stable operating conditions of the system or component recommended according to the results of specified tests.

⑧ Starting torque. The minimum effective torque obtained by the shaft when the motor starts from standstill under the specified working condition and given pressure difference.

(3) Quantity (see table below)

 

amount

Parameter name

符号

单位

单位名称

压力

P

MPa

兆帕

流量

Qv

L/min

升每分钟

排量

V

mL/r

毫升每转

转速

N

r/min

转每分

转矩

T

N·m

牛顿米

功率

P

kW

千瓦

运动黏度

υ

Mm2/s

二次方毫米每秒

容积效率

ηv

-

-

总效率

ηt

-

-

温度

θ

摄氏度

 

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