US 12,305,771 B2
Filling an armature chamber in an actuator
Dominik Guldenschuh, Freiburg (DE); Markus Moosmann, Grünkraut (DE); and Markus Diesch, Bierstetten (DE)
Assigned to ZF FRIEDRICHSHAFEN AG, Friedrichshafen (DE)
Filed by ZF Friedrichshafen AG, Friedrichshafen (DE)
Filed on Apr. 14, 2023, as Appl. No. 18/300,773.
Claims priority of application No. 102022203776.6 (DE), filed on Apr. 14, 2022.
Prior Publication US 2023/0332711 A1, Oct. 19, 2023
Int. Cl. F16K 31/06 (2006.01); F16K 47/00 (2006.01); H01F 7/08 (2006.01); H01F 27/33 (2006.01)
CPC F16K 31/0696 (2013.01) [F16K 31/0675 (2013.01); F16K 47/0111 (2021.08); H01F 7/081 (2013.01); H01F 7/088 (2013.01); H01F 27/33 (2013.01); H01F 2007/086 (2013.01)] 9 Claims
OG exemplary drawing
 
1. An electromagnetic actuator for an assembly in a motor vehicle, the electromagnetic actuator comprising:
a magnetic coil, which radially encompasses an interior chamber;
a pole tube which extends into the interior chamber encompassed by the coil;
a bearing; and
a moving armature located at least partially in an armature chamber,
wherein the armature comprises an armature rod, and the armature rod is supported by the bearing,
wherein the actuator has a first fluid path that is configured for fluid transfer between the armature chamber and a fluid reservoir in an assembly when the actuator is installed in an assembly,
wherein the actuator is configured to fill the armature chamber with fluid when the armature moves axially via drawing the fluid into the armature chamber when the actuator is operated in a fluid chamber,
wherein the armature chamber has a first fluid reservoir and a second fluid reservoir, wherein the first and second fluid reservoirs are connected to a second fluid path in a choke for fluid transfer by a choke such that the armature chamber dampens movement,
wherein the second fluid path in the choke has a lower flow resistance than the first fluid path when the actuator is in operation,
wherein a gap is formed between the pole tube and the bearing that results in the first fluid path for filling the armature chamber with fluid, and
wherein the fluid is oil.