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Electromagnetically actuatable fuel injection valve

  • US 4,717,080 A
  • Filed: 10/03/1985
  • Issued: 01/05/1988
  • Est. Priority Date: 01/25/1985
  • Status: Expired due to Fees
First Claim
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1. An electromagnetically actuatable fuel injection valve for fuel injection systems of internal combustion engines, comprising a valve housing (1) having a longitudinal axis and a step (25), a magnetic coil (3) in an interior (6) of said valve housing, said magnetic coil arranged to surround a core (7) of ferromagnetic material, a valve needle (31), a cylindrical armature (27) in proximity to said core adapted to actuate said valve needle counter to the force of a compression spring (29), said valve needle arranged to cooperate with a fixed valve seat (43);

  • first and second coaxial pipe means (11,14) disposed relative to said longitudinal axis, said first and second pipe means adapted to permit an inlet fuel flow and a return fuel flow, said armature comprising an annular body and a bore (28) and includes an end remote from said core which protrudes with little play into a through bore (26) of said step in said housing, said armature further adapted to extend below said magnetic coil adjacent to a fuel chamber (46), a nozzle body (34), a guide bore (33) in said nozzle body, said valve needle extending in said guide bore and having a terminus (30) affixed to said armature and provided with a flow connection (54), said flow connection in said valve needle terminus being in communication with said fuel chamber and said second pipe means, and said first pipe means being adapted to supply fuel through said housing and around said magnetic coil to said valve needle via a connecting line (53) which is embodied in said valve housing (1) and which discharges downstream of said armature (27) and communicates with said interior (6) which receives said magnetic coil.

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