Effect of Different Contact Surface Dimensional Tolerance on Performance of Aviation Gear Pump
The machining error of the contact surface is a sensitive factor affecting the performance of the aviation gear pump.It is necessary to study the influence of the dimensional tolerance of the contact surface on the external characteristics of the aviation gear pump.Three main contact surfaces inside the pump body(inner surface,addendum,gear surface)are selected,and the actual models with dimensional tolerances are established respectively,and compared with the ideal model without tolerance.Utilizing RNG k-e numerical simulation of three-dimensional transient flow field using turbulence model,derivation of a tolerance-based radial leakage mathematical model,and revelation of the influence of different contact surface tolerance on pump external characteristics.The results show that the contact surface tolerance reduces volumetric efficiency,alleviates flow pulsation and pressure fluctuation,and leads to a decrease in pressure gradient between adjacent chambers.The tooth surface tolerance is the most sensitive to the flow characteristic and pressure characteristic of the pump.The presence of tooth surface tolerance reduces the volumetric efficiency,instantaneous flow arithmetic mean deviation and instantaneous pressure arithmetic mean deviation by 4.7％,31.8％,and 39.3％,respectively.In addition,the tooth surface tolerance effectively alleviates the pressure in the trapped oil area and reduces the gear excitation force,while the tooth top and pump cavity contact surface tolerance have little effect on it.
万方数据
维普
