| 摘要 |
A rotor wherein, in a specific rotational phase, there is an overlap of three points, that is, a male backward-movement-side tooth tip point (B1), a female forward-movement-side tooth tip point (D2'), and the point of intersection (Q) between the surface of a casing (3) opposing a male rotor (10) and the surface of the casing opposing a female rotor (20). As the rotational phase advances therefrom, the male backward-movement tooth surface forms an epicycloid curve by means of the female forward-movement-side tooth tip point (D2'), and the female forward-movement tooth surface forms an epicycloid curve by means of the male backward-movement-side tooth tip point (B1). |
