| 摘要 |
PURPOSE:To enhance efficiency of a rotary pump by supporting armature of a coreless motor by a stationary shaft, and by providing this stationary shaft with a communication passage, for balancing the pressure, stretched in the axial direction. CONSTITUTION:A rotary pump to supply the fuel and a coreless motor equipped with an armature 31 to drive said rotary pump are installed in a casing 1 having a suction port 5 and discharge port 7, wherein the stationary shaft 21 is provided with a communication passage for balancing the pressure stretched in the axial direction. During operation, no pressure difference will be generated between the suction port side 5 and discharge port side 7. Thus the rotation of armature during the rising and operating periods will be smoothed to ensure an enhanced pumping efficiency. |
