Created on:2021-06-07 11:17

Main parameters and commonness of hydraulic motor

1.7.10 service life

The service life of hydraulic motor mainly depends on the service life of bearing and the wear of working components. The actual service life of the motor is generally longer than that of the pump of the same specification. Because the hydraulic pump often runs under rated pressure and rated speed, but the motor does not, the actual life of some motors is much longer than the design life according to rated pressure and rated speed.

The actual service life can be roughly calculated as follows:

LM=(p/pM)3(n/nM)L (1-39)

Where p, n -- design pressure and design speed;

PM, nm -- converted pressure and speed;

L -- design life.

The conversion pressure PM and the conversion speed nm can be calculated according to the time taken up by different working conditions of the working machine in a working cycle, namely

(1-40)

(1-41)

Where PI, Ni, Ti -- working pressure, speed and duration of a certain working condition.

1.7.11 installation flange and shaft extension dimension series

Like the hydraulic pump, the mounting flange of the hydraulic motor also has diamond, square, polygon (including circle) and other structural forms, such as cylindrical shaft extension, 1:10 conical shaft extension with external thread and involute spline with 30 ° pressure angle. Refer to GB / T 2353.1 and GB / T 2353.2 hydraulic pump and hydraulic motor mounting flange and shaft extension dimension series and marking (1) and (2) for pump and motor mounting flange and shaft extension dimension series and marking.

1.7.12 comparison of main performance and application scope of various hydraulic motors

The main performance comparison, applicable conditions and application scope of various hydraulic motors are shown in the table below.

Main performance comparison of various hydraulic motors

 

type

Displacement range

/mL·r-1

pressure

/MPa

Speed range / R · MON-1

Volumetric efficiency /%

Total efficiency /%

Starting torque efficiency /%

Noise

Anti pollution ability

Price

Gear pump

External meshing

5.2~160

20~25

150~2500

85~94

77~85

75~80

more

Strong

minimum

Internal cycloid

80~1250

14~20

10~800

ninety-four

seventy-six

seventy-six

less

Strong

low

Vane pump

Single acting

10~200

16~20

100~2000

ninety

seventy-five

eighty

in

difference

Lower

Double action

50~220

16~25

100~2000

ninety

seventy-five

eighty

less

difference

low

Multiple functions

298~9300

21~28

10~400

ninety

seventy-six

80~85

Small

difference

high

Axial piston pump

Swash plate

2.5~3600

31.5~40

100~3000

ninety-five

ninety

85~90

large

in

higher

Inclined axis type

2.5~3600

31.5~40

100~3000

ninety-five

ninety

85~90

large

in

higher

Double oblique axis

36~3150

25~31.5

10~600

ninety-five

ninety

ninety

less

in

high

Ball plunger type

250~600

16~25

10~300

ninety-five

ninety

eighty-five

less

Poor

in

Radial Piston Pump

Single acting

Pin connecting rod

126~5275

25~31.5

5~800

>95

ninety

>90

less

Strong

high

Static equilibrium

360~5500

17.5~28.5

3~750

ninety-five

ninety

ninety

less

Strong

higher

Roller type

250~4000

21~30

3~1150

ninety-five

ninety

ninety

less

Strong

higher

Multiple functions

滚柱柱塞传力

215~12500

30~40

1~310

95

90

90

较小

钢球柱塞传力

64~100000

16~25

3~1000

93

85

95

较小

较高

Note: the efficiency performance listed in the table is the rough average value of different roll numbers under rated conditions, not the highest efficiency value of the modified hydraulic motor.

 

Working condition and application range of various hydraulic motors

液压马达类型

适用工况

应用范围

齿轮马达

结构简单,制造容易,但转速脉动性较大,齿轮马达负载转矩不大,速度平稳性要求不高,噪声限制不严,适用于高转速低转矩情况下

钻床,通风设备等

摆线马达

负载速度中等,体积要求小

塑料机械、煤矿机械、挖掘机等

叶片马达

结构紧凑,外形尺寸小,运动平稳,噪声小,负载转矩较小

磨床回转工作台、机床操纵机构等

轴向柱塞马达

结构紧凑,径向尺寸小,转动惯量小,转速较高负载大,有变速要求,负载转矩较小,低速平稳性要求高

起重机、绞车、铲车、内燃叉车、数控机床、行走机械等

曲轴连杆径向柱塞马达

负载转矩较大,速度中等,径向尺寸大

橡塑机械、行走机械等

内曲线径向柱塞马达

负载转矩很大,转速低,平稳性高的场合

挖掘机、拖拉机、起重机、采煤机等

 

 

Generally speaking, under the same power, a hydraulic motor with excellent performance should have the following characteristics: high power mass ratio, high rated pressure and speed, low minimum stable speed, high volumetric efficiency and total efficiency, high starting mechanical efficiency, small slip speed, strong ability to bear impact load, low noise, good dynamic characteristics, long service life, etc.

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