Patent ID: 11415134

Abstract:
The invention prevents a decrease in strength of a screw rotor including a hollow portion and improves cooling performance. There is provided a screw rotor having a helical tooth on an outer periphery, the helical tooth extending by a predetermined length in an axial direction, in which a radial cross section of the screw rotor includes a cross section of a tooth portion, a cross section of an axial portion, a cross section of a support portion connected to an axial side of a tooth bottom or a tooth tip in the cross section of the tooth portion and an outer diameter side of the axial portion, and a cross section of a hollow portion formed by the support portions adjacent to each other in a rotational direction and an axial side inner surface of the tooth bottom or the tooth tip, and an axial longitudinal cross section of the screw rotor is a cross section in which the axial portion, the support portion, the axial side of the tooth bottom or the tooth tip, and an axial end portion of the screw rotor are continuously connected to each other as an integral structure by a three-dimensional fabrication method or the like.