US 12,241,441 B2
Fuel injector for injecting fuel
Gerhard Girlinger, Leonding (AT)
Assigned to Robert Bosch GmbH, Stuttgart (DE)
Appl. No. 17/786,019
Filed by Robert Bosch GmbH, Stuttgart (DE)
PCT Filed Dec. 1, 2020, PCT No. PCT/EP2020/084118
§ 371(c)(1), (2) Date Jun. 16, 2022,
PCT Pub. No. WO2021/121971, PCT Pub. Date Jun. 24, 2021.
Claims priority of application No. 10 2019 220 061.3 (DE), filed on Dec. 18, 2019.
Prior Publication US 2023/0022358 A1, Jan. 26, 2023
Int. Cl. F02M 63/00 (2006.01); F02M 47/02 (2006.01)
CPC F02M 63/0021 (2013.01) [F02M 47/027 (2013.01); F02M 63/0071 (2013.01)] 10 Claims
OG exemplary drawing
 
1. A fuel injector for injecting fuel at high pressure, the fuel injector having a housing (1) in which there is arranged a longitudinally displaceable nozzle needle (10) which, by way of a sealing surface (11), opens and closes one or more injection openings (13) via which the fuel can be ejected, and having a control chamber (20) which can be filled with fuel and which exerts a hydraulic force on the nozzle needle (10) in a closing direction thereof, and having a control valve (22) by way of which a pressure in the control chamber (20) can be influenced in that the control valve (22) opens and closes a hydraulic connection of the control chamber (20) to a low-pressure chamber (21), wherein the control valve (22) comprises a magnet armature (23) with an armature disk (24) and a cylindrical closing element (25′) that interacts with a control-valve seat (26) for the purpose of opening and closing the hydraulic connection, and wherein the control valve seat (26) is configured as a flat seat, and the closing element (25′) is made of a non-magnetizable or only slightly magnetizable material.