| 摘要 |
A displacement-type ring gear machine (pump or motor) including: a) a casing (3) including a gear chamber (4) comprising at least one supply port (10) and at least one discharge port (11) for a working fluid; b) an internal gear (1) accommodated in the gear chamber (4), the internal gear (1) being rotatable about an axis of rotation (D1) and comprising an external toothing (1a); c) a gear (2) comprising a rolling circle axis (D2) eccentric to the axis of rotation (D1) of the internal gear (1) and an internal toothing (2i) about the rolling circle axis (D2) having at least one tooth more than the external toothing (1a) and meshing with the external toothing (1a) so as to form expanding and contracting fluid cells (7) which direct the working fluid from the at least one supply port (10) to the at least one discharge port (11), when one of the gears (1, 2) performs a rotational movement relative to the other, d) the tips or roots of at least one of the two toothings (1a, 2i) comprising a profile derived from a cycloid, which may be generated by the rolling action of a pitch circle on a fixed circle, e) and the meshing toothings (1a, 2i) comprising a radial clearance (PR) and a tangential clearance (PT). The gears are characterized in that f) the tangential clearance (PT) is smaller than the radial clearance (PR), g) and the profile of the tips and roots of the at least one of the toothings (1a, 2i) is formed by or from the locus of a point on the circumference of a pitch circle whose radius becomes continuously smaller from the two flank portions to the vertex portion in the case of the tips, or becomes continuously larger or continuously smaller in the case of the roots.
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