公开(公告)号：EP2568481B1

公开(公告)日：2018-04-04

申请号：EP11814522.6

申请日：2011-07-27

申请人： Hitachi Construction Machinery Co., Ltd.

发明人： ITOU, Hideaki ,  HIRANO, Sakurako ,  TAKAO, Masaki ,  YOSHIMOTO, Mitsuhiro ,  YAMAMOTO, Akihiko ,  INATSU, Yousuke

IPC分类号： H01F7/127 ,  F16K31/06 ,  H01F7/16

CPC分类号： H01F7/1607 ,  H01F7/127

摘要： [Problem] To provide an electromagnetic drive unit that reduces the number of processing operations of an inner housing and also reduces manufacturing cost, and to provide a method for manufacturing this electromagnetic drive unit. [Solution] An electromagnetic drive unit according to the present invention includes an inner housing (H), a plunger (3) housed in the inner housing, and a solenoid assembly (SA) mounted to surround the inner housing. The inner housing (H) includes a stator (1), a yoke (2), and a cylindrical member (5). The inner housing is formed as follows. The cylindrical member and the yoke are bonded by welding in a state where one end side of the cylindrical member is fitted in a first level difference portion (2e). The cylindrical member and the stator are bonded by welding in a state where another end side of the cylindrical member is fitted in a second level difference portion (Ig).