Created on:2021-05-27 14:45

Types and basic parameters of cycloid hydraulic motor

Types and basic parameters of cycloid hydraulic motor

(6) Technical requirements

① General technical requirements. The nominal pressure series shall comply with GB / T 2346. The nominal displacement shall comply with GB / 2347 series. The dimensions of mounting flange and shaft extension shall comply with GB / T 2353.2.

The type and size of threaded oil port shall comply with GB / T 2878. Other technical requirements shall comply with 1.2-1.4 of GB / T 7935-1987.

Note: the dimensions of installation flange and shaft extension and oil port of imported and old products shall be in accordance with relevant regulations.

② Performance

a. Displacement. The no-load displacement should be in the range of 95% - 110% of the geometric displacement.

b. Volume efficiency and total efficiency. Under rated conditions, volumetric efficiency and total efficiency shall meet the requirements of the table below.

 

Service performance index

structural style

轴配流

平面配油

整体式定子

组合式定子

额定压力/MPa

8

10

12.5

8

10

12.5

10

12.5

6

公称排量/mL·r-1

 

 

 

容积效率ηv/%

≥85

≥84

≥83

≥86

≥85

≥84

≥89

≥88

≥87

总效率ηt/%

≥62

≥61

≥60

≥64

≥65

≥62

≥77

≥76

≥75

启动效率η0/%

≥56

≥56

≥62

最低转速nmin/r·min-1

≤22

≤20

≤15

Note: combined stator pointer teeth rotating stator.

c. Start up efficiency. The minimum starting efficiency at rated pressure shall be in accordance with schedule 39.

d. Low speed performance. Under the condition of rated pressure and specified back pressure, the minimum speed of hydraulic motor shall comply with the provisions of schedule 39.

e. Low temperature performance. The temperature of motor and oil is not higher than - 20 ℃. Under no-load pressure, the motor can run from low speed to high speed.

f. High temperature performance. The temperature of motor and oil shall not be lower than 90 ℃. Under rated working conditions, the motor can operate continuously for more than ten hours without external leakage.

g. Overspeed performance. Under the highest speed and rated pressure, the motor can run normally for more than 15 minutes.

h. Overload performance. Under the highest pressure and rated speed, the motor can run normally for more than 10 hours.

i. External leakage. Static seal: no oil leakage; dynamic seal: no oil dripping within 3 hours.

j. Durability. One of the following schemes can be selected for durability test: overload test for 10h, continuous reversing test for 50000 times and full load test (shaft oil distribution structure type test for 800H, plane oil distribution structure type test for 1000h); continuous reversing test for 50000 times and continuous overload test (shaft oil distribution structure type test for 200H, plane oil distribution structure type test for 250h). After the durability test, the decrease value of volumetric efficiency should not be more than 5%, and the parts should not have abnormal wear and other forms of damage.

③ Assembly quality. The technical requirements of component assembly shall comply with 1.5-1.8 of GB / T 7935-1987.

a. Air tightness. When 0.16mpa clean gas is filled into the inner cavity of the tested motor, there shall be no bubble and other leakage phenomenon.

b. Internal cleanliness. The internal cleanliness evaluation method and cleanliness index shall comply with the provisions of JB / T 7858. The specific cleanliness index is shown in the table below.

 

Cleanliness index

公称排量/mL·r-1

80~160

200~400

500~630

800~1250

内腔污物颗粒重量/mg

≤95

≤100

≤110

≤120

 

④ Appearance requirements. Appearance requirements shall comply with 1.9 and 1.10 of GB / T 7935-1987.

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