Abstract
The CFD analysis on the performance of the rotor oil pump in the automatic transmission with and without the tunnel in the cover was carried out theoretically. Model 1 has a tunnel on the cover and Model 2 does not have one. As the rotating speed increases from 1,000 to 6,000 rpm, the discharged flow rate of Model 1 increases from 10.65 rpm to 64.67 rpm and volumetric efficiency increases from 81.3% to 87.8%. The Model 2 shows the similar discharged flow rate and volume efficiency with those of the Model 1. The torque load of Model 1 increases from 3.21 N·m to 3.38 N·m with increasing from 1000 to 2,000 rpm, and the Model 2 shows almost similar one. However, at the high speed like 6,000 rpm, the torque load of Model 2 is 4.37 Nm, which is 2.4% higher than that of the Model 1. The reason is that the presence of cover tunnel can decrease pulsating pressure and vibration. Therefore, the application of cover tunnel in the gerotor pump can increase performance and decrease sound and vibration.
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