| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide a method for manufacturing a helical gear with high accuracy without causing an under-fill at a side for starting tooth molding and without causing a swelling part at a side for finishing the tooth molding. <P>SOLUTION: The forging molding method of the helical gear forms a helical tooth part 23 at an outer circumference of a preformed gear W3 by allowing the preformed gear W3 to be press-fitted in a tooth profile of a die from one end side. In the outer diameter of the preformed gear W3, one end side 12a in an axial direction where tooth part molding is started by being press-fitted in the tooth profile of the die first is formed to be larger in a diameter than the other end side 12b in the axial direction where the tooth part molding is finished. <P>COPYRIGHT: (C)2012,JPO&INPIT |
