| 摘要 |
PROBLEM TO BE SOLVED: To suppress movement in a radial direction, of an inner gear in a state of an internal gear pump single body, while combining suppression of degradation of a pump output capacity of an internal gear pump and suppression of increase of costs.SOLUTION: In an internal gear pump including an inner gear 10, an outer gear, and a housing, any one of a main body portion opposite face 10A of the inner gear 10 (at least one side of axial end faces) and an inner gear opposite face 30KA is provided with an annular projecting portion 16 (projecting portion) projecting in the axial direction around a fitting hole 10H, and the other is provided with an annular recessed portion 36 opposed to the annular projecting portion 16. In a state that a driving shaft S is not fitted, the annular projecting portion 16 and the annular recessed portion 36 are engaged with each other to restrict radial movement of the inner gear 10, and in a state of fitting the driving shaft S, an arrangement constitution to keep the annular projecting portion 16 and the annular recessed portion 36 in a non-contact state in rotating the inner gear 10 by rotation of the driving shaft S, is applied.SELECTED DRAWING: Figure 1 |
