Main parameters and commonalities of hydraulic motors

Kwadalwa ngo 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) Minimum stable speed and speed pulsation rate the minimum stable speed refers to the minimum speed at which the speed pulsation rate of the hydraulic motor does not exceed the allowable value under the rated load after excluding the pulsation factors of the external input motor.

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

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

For various hydraulic motors in different applications, the requirements of speed pulsation rate are different. However, the speed with angular velocity pulsation rate less than ± 10% under rated load is generally regarded as the lowest stable speed of the hydraulic motor. In engineering practice, the lowest speed of the hydraulic motor before crawling phenomenon (shaking or turning and stopping) observed by naked eyes is often regarded as the lowest stable speed of the motor.

(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 một 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.

Wanneer die hidrouliese motor met belasting werk teen 'n spoed laer as die minimum stabiele spoed, neem die wrywing toe en is dit onstabiel, en die stelseldruk fluktueer. Op hierdie tydstip is die glyoppervlak van die krag oordragonderdele van die hidrouliese motor maklik om te beskadig, wat die dienslewe van die motor verminder en direk die werkgehalte van die gasheer masjien beïnvloed. Daarom is dit oor die algemeen nie toegelaat dat die hidrouliese motor vir 'n lang tyd in die kruiptoestand werk nie.

(3) Imininingwane yokuhamba okuzinzile okuncane kwezinhlobo ezahlukene zamamota e-hydraulic ngokombono wezokwakha, ukuze wandise ibanga lokuhamba le-motor, kuncane kangcono ukuhamba okuzinzile okuncane kwe-motor ye-hydraulic.

Ku motori za hydraulic zine na maumbile tofauti, mipaka ya chini ya kasi thabiti ni kama ifuatavyo: motor ya gia kwa kawaida ni 200-300r / min, binafsi inaweza kuwa 50-150r / min; motor ya vane ya kasi ya juu ni takriban 50-100r / min; motor ya vane ya kasi ya chini na torque ya juu ni takriban 5R / min; motor ya curve ya ndani ya hatua nyingi ni takriban 0.1-lr / min; motor ya crankshaft na rod ni takriban 2-3r / min; motor ya usawa wa hydrostatic ni takriban 2-3r / min; motor ya usawa wa axial ni takriban 2-3r / min. Motor ya piston ni takriban 30 ~ 50R / min, baadhi zinaweza kufikia 1.2 ~ 5R / min, baadhi zinaweza kufikia 0.5 ~ 1.5r/min.

Mu dizayini ya hydraulic system, ku reduza xitlhangu xa xitlhangu xa le hansi, ku fanele ku langutisiwa hi ku tsundzuxa. Hi xikombiso, hi ku tirhisa mfumo wa ku lawula xitlhangu xa hydraulic, xitlhangu xa le hansi xa xitlhangu xa mukhuva wa maphakathi xi nga hunguteriwa ku 0. OLR / min.

1.7.7 vibrasie, geraas en beheer

Hydraulic motor ke lezi iqunzi elikhulu lokukhala kohlelo lwe-hydraulic. Ukudlidliza nokukhala nakho kubalulekile ukuze kuhlolwe ukusebenza kwe-hydraulic motor. Njengoba kusebenza ne-hydraulic pump, ukukhala kwe-hydraulic motor kuhlanganisa ikakhulukazi ukukhala kwemishini nokukhala kwe-fluid.

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 ukushayisana 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 ukushayisana kwemishini nokukhala; yenza inqubo yokushintsha uwoyela ophakeme noluphansi ibe mncane ngangokunokwenzeka ukuze ugweme ukushayisana kwe-hydraulic okuphuthumayo; hlela kahle ipayipi lesistimu, njengokuthi ngangokunokwenzeka usebenzise ipayipi elikhulu ukuze unciphise ijubane lokugeleza kowoyela epayipini, ugweme ukumelana okukhulu kwendawo, futhi unciphise i-torque ripple ye-motor ye-hydraulic; umhubhe wok leaking we-motor ubekwe phezulu kweshubhu, ukuze ingxenye ejikelezayo ifakwe emanzini, ukuze wandise ukumelana nokushayisana nokunciphisa ukushayisana nokukhala kwe-motor.

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