US 11,962,204 B2
Rotor manufacturing method and rotor manufacturing apparatus
Takaaki Kawashima, Kariya (JP); Yutaka Hara, Kariya (JP); and Mariko Saito, Kariya (JP)
Assigned to AISIN CORPORATION, Kariya (JP)
Appl. No. 17/602,295
Filed by AISIN CORPORATION, Aichi (JP)
PCT Filed May 21, 2020, PCT No. PCT/JP2020/020180
§ 371(c)(1), (2) Date Oct. 8, 2021,
PCT Pub. No. WO2020/255618, PCT Pub. Date Dec. 24, 2020.
Claims priority of application No. 2019-114521 (JP), filed on Jun. 20, 2019.
Prior Publication US 2022/0166294 A1, May 26, 2022
Int. Cl. H02K 15/02 (2006.01); B23P 19/02 (2006.01)
CPC H02K 15/02 (2013.01) [B23P 19/02 (2013.01)] 12 Claims
OG exemplary drawing
 
1. A method for manufacturing a rotor that is operatively associated with an apparatus, the rotor includes an annular rotor core provided with a shaft insertion hole, and a tubular shaft, the rotor manufacturing method comprising steps of:
inserting the tubular shaft into the shaft insertion hole of the rotor core;
pressing the rotor core in a central axis direction of the rotor core by using a core pressing member of the apparatus; and
fixing the tubular shaft to the rotor core, while the rotor core pressed by performing hydroforming, wherein the performing of hydroforming comprises filling a fluid into the tubular shaft and pressurizing the fluid so as to expand the tubular shaft, thus pressure-welding the tubular shaft to an inner peripheral surface of the shaft insertion hole.