| 摘要 |
PROBLEM TO BE SOLVED: To provide an internal gear pump which reduces pulsation amplitude of discharge pressure without deteriorating discharge efficiency. SOLUTION: A pump rotor includes an inner rotor 3 having teeth the number of which is n and an outer rotor 4 having teeth the number of which is n+1, the inner rotor 3 and the outer rotor 4 being eccentrically arranged and combined with each other. Pump units 1, 2 are each constituted by storing the pump rotor in a casing 8 including an intake port 5, a discharge port 6 and a gear chamber 7 opened at one end. The pump units 1, 2 are connected to each other with a partition plate 9 interposed therebetween. The partition plate closes the opening ends of the gear chambers 7 of the pump units 1, 2 facing each other. The inner rotors 3, 3 of the pump units 1, 2 are attached to the same rotary shaft in such a manner that phases of their teeth are shifted from each other at an angle less than an angular pitch, preferably 180/n degrees. COPYRIGHT: (C)2007,JPO&INPIT
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