US 6,982,619 B2
Solenoid stator assembly having a reinforcement structure
Randy Nussio, Grand Rapids, Mich. (US)
Assigned to Robert Bosch GmbH, Stuttgart (Germany)
Filed on Feb. 07, 2003, as Appl. No. 10/361,124.
Prior Publication US 2004/0155740 A1, Aug. 12, 2004
Int. Cl. H01F 7/08 (2006.01)
U.S. Cl. 335—262 14 Claims
OG exemplary drawing
 
1. A solenoid stator assembly for an electromechanically actuated fuel injector, the solenoid stator assembly comprising:
a permeable stator core having a central pole piece and an outer pole piece, each pole piece terminating at a pole face;
a stator coil with a central axis comprising conductor windings about the stator core central pole piece, the stator coil being insulated with respect to the stator core and having a pair of leads;
a housing formed of an electrically insulating material, the housing having a wall with a mounting end and a closed end, the wall defining an internal cavity for enclosing the stator core and stator coil therein such that the pole face of the stator core central pole piece is oriented proximate to the mounting end of the housing, which forms a mounting surface about the periphery of the wall, the stator assembly being attachable to a fuel injector such that the mounting surface sealingly engages a corresponding fuel injector surface, the pole face of the stator core central pole piece being proximate to an armature of the fuel injector;
the insulating material engaging an outer surface of the stator core whereby the stator core is secured firmly to the housing;
an elongate reinforcement structure disposed within the insulating material of the housing whereby the reinforcement structure is enveloped by the insulating material, the reinforcement structure being positioned generally about the stator core for structurally enhancing the housing;
the reinforcement structure extending in the direction of the central axis and from the mounting end of the housing to the closed end of the housing; and
a pair of electrical terminals extending into the housing, each terminal being connected to one of the pair of leads of the stator coil for conducting an electrical current therethrough to generate a flux field that electro-mechanically actuates the fuel injector armature.