| 摘要 |
A rotary pump is provided in which a drive motor is provided such that an output shaft of the drive motor is placed at an offset position, so that a rotational speed of the pump can be changed to a high or low speed. Furthermore, rigid balls or needle roller bearings are used in each rotor unit such that each eccentric rotary body is in rolling contact with a circumferential inner surface of each cylindrical housing, thus reducing friction between them, thereby ensuring smooth rotation of the rotor units. In addition, a space, which is defined between each cylindrical housing and each eccentric rotary body, prevents a cross-plate from being damaged due to torsional stress and tensile force, thereby ensuring superior durability of the pump.
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