| 摘要 |
PROBLEM TO BE SOLVED: To produce the chip peeled off from a work favorably by a little cutting force. SOLUTION: In view of a peripheral direction in each circumferential plane 13, one flank 8 of the tooth in a first teeth row 4 is shifted forward 16 to the axial direction against the flank 8 of the tooth of the second adjacent teeth row 4 every time or the flank 9 of the tooth in the second teeth row 14 is shifted backward against the flank 9 of the tooth in the first teeth row 4. In respective teeth, one flank is shifted forward and the other flank is shifted backward 17. The forward shift is changed place with the backward shift. |
