| 摘要 |
PROBLEM TO BE SOLVED: To provide a rotary pump suppressing an increase in driving torque and improving volumetric efficiency by a simple structure. SOLUTION: An inner rotor 40 is formed with outer teeth and is rotated integrally with a shaft 10. An outer rotor 50 is formed with inner teeth engaged with the outer teeth of the inner rotor 40, and is provided eccentrically with respect to the inner rotor 40. The outer rotor 50 includes a pressure chamber which is provided between the outer rotor and inner rotor and whose volume is changed. A clearance between the axial end surface 331 of a pump chamber 33 in a second housing 31 and the axial end surface 401 of the inner rotor 40 is different in dimension from a clearance between the axial end surface 331 of the pump chamber 33 and the axial end surface 501 of the outer rotor 50. Thereby, it is possible to suppress the increase in the driving torque, and to improve the volumetric efficiency by the simple structure. COPYRIGHT: (C)2011,JPO&INPIT |
