| US 7,541,906 B2 | ||
| Sintered plunger and production method therefor | ||
| Kazuo Asaka, Matsudo (Japan); Tsuyoshi Akao, Kariya (Japan); and Aya Hamano, Saitama (Japan) | ||
| Assigned to Hitachi Powdered Metals Co., Ltd., Matsudo-shi (Japan); and Denso Corporation, Kariya-shi (Japan) | ||
| Appl. No. 10/571,792 PCT Filed Sep. 15, 2004, PCT No. PCT/JP2004/013445 § 371(c)(1), (2), (4) Date Mar. 15, 2006, PCT Pub. No. WO2005/029515, PCT Pub. Date Mar. 31, 2005. |
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| Claims priority of application No. 2003-325027 (JP), filed on Sep. 17, 2003. | ||
| Prior Publication US 2007/0085644 A1, Apr. 19, 2007 | ||
| Int. Cl. H01F 3/00 (2006.01); B22F 7/02 (2006.01); B22F 7/04 (2006.01) | ||
| U.S. Cl. 335—279 [419/8] | 9 Claims |
| 1. A sintered plunger used for electromagnetic actuators, comprising:
an outer member composed of a soft magnetic material and having an inner hole formed therein; and
a shaft having an end portion which is fitted into the outer member,
wherein the shaft is composed of a ferromagnetic steel, the outer member is composed of a sintered member, and the shaft and
the outer member are integrally bonded by sintering them.
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