US 12,447,542 B2
Method for chamfering toothed gear
Koji Tsutsuyama, Toyokawa (JP)
Assigned to OSG CORPORATION, Toyokawa (JP)
Appl. No. 17/796,891
Filed by OSG CORPORATION, Toyokawa (JP)
PCT Filed Apr. 3, 2020, PCT No. PCT/JP2020/015262
§ 371(c)(1), (2) Date Aug. 2, 2022,
PCT Pub. No. WO2021/199417, PCT Pub. Date Oct. 7, 2021.
Prior Publication US 2023/0055299 A1, Feb. 23, 2023
Int. Cl. B23F 19/10 (2006.01); B23F 21/12 (2006.01)
CPC B23F 19/105 (2013.01) [B23F 19/102 (2013.01); B23F 21/12 (2013.01); Y10T 409/101113 (2015.01)] 14 Claims
OG exemplary drawing
 
1. A method for chamfering a toothed gear, the method comprising:
a toothed gear formation step of forming a plurality of teeth around an axis of the toothed gear; and
a chamfering step of sequentially chamfering, with a tool, the teeth formed by the toothed gear formation step, the tool including a plurality of end cutting edges formed at an end portion in an axis direction of an axis of the tool and formed around the axis of the tool,
in which method for chamfering the toothed gear, at the chamfering step, the axis of the tool is inclined from the axis of the toothed gear and the toothed gear and the tool are rotated and line intersection portions, between: (i) tooth flanks positioned on a forward side in a direction of rotation of the toothed gear among tooth flanks of the teeth, and (ii) end faces of the teeth in a tooth trace direction that extends in the direction of the axis of the toothed gear, are thereby sequentially chamfered with the end cutting edges,
wherein a pitch of the end cutting edges is set to M times a pitch of the teeth, and
wherein at the chamfering step, a circumferential speed of the end cutting edges is made faster than a circumferential speed of the teeth to chamfer the line intersection portions;
the teeth are chamfered every N teeth; and
values of M and N satisfy a relation of M>1, and a relation of M−1>N≥1.