Main parameters and commonalities of hydraulic motors

创建于05.17

1.7.6 low speed stability and creeping phenomenon

The low speed stability of hydraulic motor is usually measured by the lowest stable speed.

(1) Iminimu esheshayo nesilinganiso sokushintsha kwesivinini, i-minimum stable speed ibhekisela esivumelwaneni esincane lapho isilinganiso sokushintsha kwesivinini somshini we-hydraulic singadluli inani elivunyelwe ngaphansi komthwalo obekiwe ngemuva kokukhipha izici zokushintsha zomshini wokufaka wangaphandle.

Speed fluctuation rate δ n (%) is the ratio of speed change amplitude ±△ n to average speed NAV, i.e

δn=±△n/nav                      (1-37)

Ngokwezimoto ezihlukahlukene ze-hydraulic ezisebenzayo ezihlukene, izidingo zephulsation yesivinini zihluke. Nokho, isivinini esine-angular velocity pulsation rate engaphansi kuka-± 10% ngaphansi komthwalo ophakeme ngokuvamile sithathwa njengokuphansi kwesivinini esizinzile semoto ye-hydraulic. Ekusebenzeni kwezobunjiniyela, isivinini esiphansi semoto ye-hydraulic ngaphambi kokubona isimo sokuhamba (ukushaya noma ukujika nokuma) ngamehlo avulekile ngokuvamile sithathwa njengokuphansi kwesivinini esizinzile semoto.

(2) Khi tốc độ của động cơ thấp, hệ số ma sát của các bộ phận thủy lực tăng dần, và hệ số ma sát của các bộ phận thủy lực tăng. Chất liệu và chất lượng công nghệ của bề mặt trượt, hình thức cấu trúc và độ nhớt của dầu sẽ đóng vai trò quan trọng trong sự xuất hiện của sự không ổn định này.

The causes of low-speed crawling of hydraulic motor are: the leakage is unstable; the theoretical torque pulsation of hydraulic motor; the friction is unstable. The internal and external leakage of each friction pair of hydraulic motor is different at every moment. The leakage is related to the structure of motor, the clearance of friction pair, working pressure difference, liquid viscosity and other factors. With the decrease of the flow rate of the input hydraulic motor, the influence of the leakage flow pulsation on the output speed pulsation of the motor increases gradually. That is to say, when the motor speed decreases to the low speed state, the speed pulsation rate increases rapidly, and the motor appears unstable crawling.

Figure a shows the speed pulsation rate curve of the hydraulic motor. It can be seen that when the speed is less than 3R / min, the speed pulsation rate increases rapidly, so it can be determined that the minimum stable speed of the motor is 3R / min.

When the hydraulic motor with load works at a speed lower than the minimum stable speed, the friction increases and is unstable, and the system pressure fluctuates. At this time, the sliding surface of the force transmission parts of the hydraulic motor is easy to damage, which reduces the service life of the motor and directly affects the working quality of the host machine. Therefore, it is generally not allowed for the hydraulic motor to run in the crawling state for a long time.

(3) Die minimale stabile Geschwindigkeitsbereich verschiedener Arten von Hydraulikmotoren aus der Perspektive der Ingenieurgpraxis, um den Geschwindigkeitsbereich des Motors zu erweitern, desto kleiner die minimale stabile Geschwindigkeit des Hydraulikmotors, desto besser.

Ku motora ya hydraulic e na mekgwa e fapaneng, mekhahlelo e fokolang ea lebelo e fapana le: motora ea gear ka kakaretso e le 200-300r / min, e 'ngoe e ka ba 50-150r / min; motora ea vane e phahameng e ka ba le 50-100r / min; motora e tlase e nang le torque e phahameng e ka ba le 5R / min; motora ea curve e ngata e ka ba le 0.1-lr / min; motora ea crankshaft e amanang le rod e ka ba le 2-3r / min; motora ea hydrostatic balance e ka ba le 2-3r / min; motora ea axial balance e ka ba le 2-3r / min Motora ea piston e ka ba le 30 ~ 50R / min, tse ling li ka fihla ho 1.2 ~ 5R / min, tse ling li ka fihla ho 0.5 ~ 1.5r/min.

In der Gestaltung des hydraulischen Systems sollte sorgfältig berücksichtigt werden, um die minimale stabile Geschwindigkeit zu reduzieren. Zum Beispiel kann durch die Verwendung des Niedriggeschwindigkeitsregelsystems des Hydraulikmotors die niedrigste stabile Geschwindigkeit des inneren Kurvenmotors auf 0 OLR / min reduziert werden.

1.7.7 vibrasie, geraas en beheer

Hydraulic motor is also the main noise source of hydraulic system. Vibration and noise are also important indexes to measure the performance of hydraulic motor. Similar to hydraulic pump, the noise of hydraulic motor mainly includes mechanical noise and fluid noise.

The allowable noise value of hydraulic motor in China is specified in JB / T 8728-1998 low speed high torque hydraulic motor: for example, under rated conditions, the noise value of radial piston hydraulic motor with inner curve whose displacement is > 0.16-0.56l/r should be ≤ 82 dB (a); the noise value of axial piston hydraulic motor with double swash plate whose displacement is > 1.25-280l/r should be ≤ 80 dB (a).

Kuya kuhlola, ukusebenzisa nokugcinwa, izindlela eziyinhloko zokulawula ukuvuvukala nokukhala kwe-motor ye-hydraulic zimi kanje: nikeza phambili i-motor ye-hydraulic enokukhala okuphansi; zama ukuthuthukisa ukunemba kokucubungula nokufaka i-motor ye-hydraulic kanye nezindawo zayo ezihlangene ukuze unciphise ukuvuvukala kwemishini nokukhala; yenza inqubo yokushintsha uwoyela ophakeme noluphansi ibe mncane ngangokunokwenzeka ukuze ugweme ukuhlaselwa kwe-hydraulic okuphuthumayo; hlela kahle ipayipi yesistimu, njengokuthi ngangokunokwenzeka usebenzise ipayipi elikhulu ukuze unciphise ijubane lokugeleza kwe-oyela epayipini, ugweme ukumelana okukhulu kwendawo, futhi unciphise i-torque ripple ye-motor ye-hydraulic; umhubhe wok leaking we-motor ubekwe phezulu kwe-shell, ukuze ingxenye ejikelezayo ifakwe emanzini, ukuze wandise ukumelana nokuvuvukala nokunciphisa ukuvuvukala nokukhala kwe-motor.

Shiya imininingwane yakho futhi
sizokuthinta.

Phone

WeChat