Electromagnetically actuatable fuel-injection valve

• US 4,721,254 A
• Filed: 12/04/1985
• Issued: 01/26/1988
• Est. Priority Date: 12/06/1984
• Status: Expired due to Fees

• Current Assignee: VDO Adolf Schindling AG (Vodafone Group PLC)
• Original Assignee: VDO Adolf Schindling AG (Vodafone Group PLC)
• Inventors: Horn, Martin
• Primary Examiner(s): NOT, DEFINED
• Assistant Examiner(s): Jones, Mary Beth O.
• Application Number:
  US06/805,086
• Time in Patent Office: 783 Days
• Field of Search: 239/533.2-533.12, 239/585, 251/129.16
• US Class Current: 239/585.3
• CPC Class Codes: F02M 2200/07 Fuel-injection apparatus having means for avoiding sticking of valve or armature, e.g. preventing hydraulic or magnetic sticking of parts
• CPC Class Codes: F02M 2200/9015 Elastomeric or plastic materials
• CPC Class Codes: F02M 51/0639 the armature acting as a valve
• CPC Class Codes: F02M 51/08 specially for low-pressure fuel-injection
• CPC Class Codes: F02M 61/06 the valves being furnished at seated ends with pintle or plug shaped extensions

Abstract

An electromagnetically actuatable fuel-injection valve for injection systems of internal combustion engines has a valve housing, a soft-iron core which is located within the valve housing and bears a fixed solenoid winding, and a valve closure plate which forms an armature and coaxially faces said core forming an air gap with it. This plate can be urged by a compression spring against an annular seat 10 which surrounds an outlet, and whose radially circumferential edge is guided in axial movement along a guide which correspondingly surrounds said edge. The valve closure plate has a coaxially protruding plug which extends through or into the outlet.

Claims

1. In an electromagnetically actuatable fuel-injection valve for injection systems of internal combustion engines, the valve having a valve housing, a soft-iron core located within the valve housing and carrying a stationary solenoid winding, an annular seat, a valve closure plate which forms an armature and coaxially faces said core with the formation of an air gap, a compression spring biasing said plate against said annular seat;

and wherein said seat surrounds an outlet of said valve, a radially circumferential edge of said plate is guided axially and is movable along a guide of said valve, said valve correspondingly surrounding said edge, the improvement wherein

the valve closure plate has a coaxially protruding plug, said plug extending at least partway into said outlet, said plug having a concave-fillet-shaped transition towards an outlet-side surface of said valve closure plate.

2. The fuel-injection valve according to claim 1, wherein

said valve closure plate has a barrel-shaped cross section at a radially circumferential edge thereof.

3. The fuel-injection valve according to claim 1, further comprising

an abutment against which said valve closure plate rests during opening of said valve, and

a resting ring which concentrically surrounds the annular seat and is spaced radially from it, said ring and said seat extending approximately the same distance toward said abutment, and wherein

said valve closure plate rests, via a radially outer region of its outlet-side surface, against said resting ring.

4. The fuel-injection valve according to claim 1, wherein

the transition is formed in the outlet side surface of said valve closure plate to form a recess.