| 摘要 |
<p>PROBLEM TO BE SOLVED: To provide an inscribed-type gear pump which can reduce the generation of noise and erosion, and can further improve pump efficiency by a simpler constitution.SOLUTION: An inscribed-type gear pump comprises: an inner rotor 10; an outer rotor 20; a pump housing 31; and a drive shaft which is inscribed with the inner rotor, rotationally drives the inner rotor, and has a hollow part therein. A working fluid which is higher in pressure than the pressure of a working fluid in a transportation chamber which passes through sealing positions 10F being opposing positions and through which the transportation chamber 10V which has reached a terminal end of a suction port 30in in the pump housing passes until the transportation chamber reaches a start end of a discharge port 30ex is introduced into the hollow part of the drive shaft. A pressurized-oil introduction passage M10A which introduces the working fluid in the hollow part of the drive shaft into the transportation chamber 10V passing through the sealing positions is formed in at least one of the sealing positions 10F being the opposing positions in the pump housing 31.</p> |
