ARMATURE SHAFT PRODUCING METHOD, ARMATURE SHAFT, AND ROTATING ELECTRIC MACHINE

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EP 1 626 481 A8

(12)	CORRECTED EUROPEAN PATENT APPLICATION
	published in accordance with Art. 158(3) EPC

(15)	Correction information:
	Corrected version no 1 (W1 A1)

(48)	Corrigendum issued on:
	23.08.2006 Bulletin 2006/34

(43)	Date of publication:
	15.02.2006 Bulletin 2006/07

(21)	Application number: 04732507.1

(22)	Date of filing: 12.05.2004

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International Patent Classification (IPC):

H02K 15/14^(2006.01)

(86)	International application number:
	PCT/JP2004/006720

(87)	International publication number:
	WO 2004/102772 (25.11.2004 Gazette 2004/48)

(84)	Designated Contracting States:
	DE FR IT

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Priority:

19.05.2003 JP 2003140943
24.07.2003 JP 2003279277
20.10.2003 JP 2003360033

(71)	Applicant: ASMO CO., LTD.
	Kosai-city, Shizuoka-pref. 431-0493 (JP)

(72)	Inventors:
	INOUE, Keiji c/o Asmo Co., Ltd. Kosai-shi, Shizuoka 431-0493 (JP) SASAKI, Takayoshi c/o Asmo Co., Ltd. Kosai-shi, Shizuoka 431-0493 (JP) KIDOWAKI, Koji c/o Asmo Co., Ltd. Kosai-shi, Shizuoka 431-0493 (JP) MATSUMOTO, Nobuyuki c/o Asmo Co., Ltd. Kosai-shi, Shizuoka 431-0493 (JP) TAKEUCHI, Masanori c/o Asmo Co., Ltd. Kosai-shi, Shizuoka 431-0493 (JP)

(74)	Representative: Kuhnen & Wacker
	Intellectual Property Law Firm Prinz-Ludwig-Strasse 40A 85354 Freising 85354 Freising (DE)

(54)	ARMATURE SHAFT PRODUCING METHOD, ARMATURE SHAFT, AND ROTATING ELECTRIC MACHINE

(57) In a forging process step, a small diameter portion 12 is formed in the leading end portion of a cylindrical shaft material 30, and an installation depressed portion 11d is formed on a base end face of the shaft material 30 for installing a ball 15 therein to receive thrust force, by cold forging process using a forging mold 31. In a worm forming process after the forging process step, a worm 13 is formed in the small diameter portion 12 by rolled dies. The small diameter portion 12 and the installation depressed portion 11d are formed by cold forging process, so that an outer circumferential face of the small diameter portion 12 and an inner face of the installation depressed portion11d become even surfaces with small surface roughness.