Actuator

Patent metadata

Field	Value
Publication number	US-2015292456-A1
Application number	US-201314438909-A
Country	US
Kind code	A1
Filing date	Sep 30, 2013
Priority date	Oct 31, 2012
Publication date	Oct 15, 2015
Grant date	—

Abstract

The invention relates to an actuator ( 1 ) comprising a housing ( 8 ), a coil ( 29 ) and an armature (2) which interacts with a tappet ( 30 ) and a spring, the armature plate ( 3 ) thereof being arranged to lie opposite an armature counterpiece ( 16 ), and said actuator ( 1 ) comprising at least one magnetostrictively-active component. According to the invention, an actuator ( 1 ) is provided with which large actuating paths can be travelled at high actuating forces. This is achieved by the actuator ( 1 ) additionally being designed to act as a solenoid.

First claim

1 . An actuator ( 1 ), having a housing ( 8 ), a coil ( 29 ), an armature ( 2 ) which interacts with a tappet ( 30 ) and a spring, and of which an armature plate ( 3 ) is arranged opposite an armature counterpiece ( 16 ), and wherein the actuator ( 1 ) has at least one magnetostrictively acting component,
characterized in that the actuator ( 1 ) is additionally a solenoid.

2 . The actuator ( 1 ) as claimed in claim 1 ,
characterized in that the tappet ( 30 ) is magnetostrictive.

3 . The actuator ( 1 ) as claimed in claim 1 ,
characterized in that the tappet ( 30 ) is arranged between the armature ( 2 ) and, on an opposite side, a sliding piece ( 31 ).

4 . The actuator ( 1 ) as claimed in claim 3 ,
characterized in that the armature ( 2 ) and the sliding piece ( 31 ) are connected to one another by a spring which surrounds the tappet ( 30 ).

5 . The actuator ( 1 ) as claimed in claim 4 , characterized in that the spring is a sleeve spring ( 32 ).

6 . The actuator ( 1 ) as claimed in claim 4 ,
characterized in that the spring is a tension spring which exerts a pretension onto the tappet ( 30 ).

7 . The actuator ( 1 ) as claimed in claim 3 ,
characterized in that the sliding piece ( 31 ) is cylindrical and is guided in a recess ( 33 ) in the housing ( 8 ).

8 . The actuator ( 1 ) as claimed in claim 1 ,
characterized in that the coil ( 29 ) is arranged in the housing ( 8 ) so as to surround at least the tappet ( 30 ) and the spring.

9 . The actuator ( 1 ) as claimed in claim 1 ,
characterized in that the armature ( 2 ) interacts with a coupler rod ( 21 ) opposite the tappet ( 30 ).

10 . The actuator ( 1 ) as claimed in claim 9 ,
characterized in that the coupler rod ( 21 ) is guided through an opening in the armature counterpiece ( 16 ).

11 . A fuel injector ( 5 ) comprising an actuator ( 1 ) as claimed in claim 1 .

12 . A method for operating an actuator, having a housing ( 8 ), a coil ( 29 ), an armature ( 2 ) which interacts with a tappet ( 30 ) and a spring and of which an armature plate ( 3 ) is arranged opposite an armature counterpiece ( 16 ), and wherein the actuator ( 1 ) has at least one magnetostrictively acting component,
wherein the tappet is magnetostrictive, wherein, when current is applied to the coil ( 29 ), a magnetic flux forms across the armature ( 2 ), the tappet ( 30 ), a sliding piece ( 31 ) and the housing ( 8 ), the magnetostrictive tappet ( 30 ) being extended by said magnetic flux, and wherein, after a limit extension is reached, an attraction force between the armature plate ( 3 ) and the armature counterpiece ( 16 ) is large enough to move the armature ( 2 ), together with the tappet ( 30 ) and the sliding piece ( 31 ), to bear against the armature counterpiece ( 16 ) in the manner of a solenoid.

Assignees

• Bosch Gmbh Robert

Inventors

• Beier Marco
• Rettich Andreas
• Pauer Thomas
• Ricco Mario

Classifications

• F02M51/061 Primary

  using electromagnetic operating means · CPC title

• F02M51/0603

  using piezoelectric or magnetostrictive operating means · CPC title

• F02M63/0063

  Two or more actuators acting on a single valve body · CPC title

• F02M2200/704

  with actuator and actuated element moving in different directions, e.g. in opposite directions · CPC title

• F02M2200/50

  Arrangements of springs for valves used in fuel injectors or fuel injection pumps · CPC title