| 摘要 |
<p>PROBLEM TO BE SOLVED: To provide an internal gear pump in which a discharging volume of fluid can be varied by changing a position of an outer rotor contacted with an inner rotor, a high accuracy is kept in its manufacturing process and its manufacturing is made simple.SOLUTION: There are provided an inner rotor 3, an outer rotor 4 rotated in respect to its rotating center P3 with a prescribed eccentricity (e), an outer ring 5 rotatably holding the outer rotor 4 and formed with at least three cam protrusions 53, a pump housing A having a rotor chamber 1, pins 6 having the same number as that of the cam protrusions 53 and an operating means 7 for oscillating the outer ring 5. It is constituted such that a position of each of the pins 6 is set in such a way that a diametral center P5 of a holding inner periphery 51 of the outer ring 5 is moved by the operating means 7 along an orbit circle Q with the prescribed eccentricity (e) being a radius in respect to the rotating center P3 of the inner rotor 3.</p> |
