| 摘要 |
PCT No. PCT/JP87/00537 Sec. 371 Date Mar. 21, 1988 Sec. 102(e) Date Mar. 21, 1988 PCT Filed Jul. 23, 1987.A rotary pump device comprises planet gear devices 4, 5 each composed of a center gear 6, 7, planet gears 8, 9 and an inner toothed annular gear 10, 11, all being non-circular gears, and a mechanism for rotationally moving a plurality of rotary pistons 18, 19 in an annular cylinder 17 at periodically variable speed in synchronism with variable speed orbital movements given to planet shafts 20, 21 by said planet gear devices.
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