| 摘要 |
PROBLEM TO BE SOLVED: To improve pump efficiency and to facilitate manufacture by preventing competition from being generated in meshing of an idler 3 and on internal gear 5 of a crescent internally rotating gear pump 1 and transmission of power and motion from being impeded. SOLUTION: The internal gear 5 has correction transverse tooth profiles 13a, 13b obtained by rotating front and rear theoretical transverse tooth profiles 12a, 12b toward the tooth central line (h) around the rotational center 0 of the internal gear 5 by the small rotation angleα.
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