| 摘要 |
PROBLEM TO BE SOLVED: To provide an internal gear type pump capable of restraining meshing noise and tooth hitting noise of a pump rotor, and capable of reducing noise and vibration caused by the meshing noise or the tooth hitting noise. SOLUTION: At least one of an inner rotor 2 and an outer rotor 3 is formed by a sintered material having the porosity of 17% or more, and the pump rotor 4 wherein the inter rotor 2 and the outer rotor 3 are eccentrically arranged and combined is housed in a casing 5 having a suction port 6 and a discharge port 7, and the internal gear type pump 1 is obtained. In the sintered material having the enhanced porosity, impact noise is attenuated compared to the one in the sintered material having the low porosity (high density), and damping performance of sound is also enhanced, and thereby, noise and vibration of the pump having the rotor can be reduced. COPYRIGHT: (C)2007,JPO&INPIT
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