Fuel injection valve

• US 4,033,507 A
• Filed: 01/14/1976
• Issued: 07/05/1977
• Est. Priority Date: 01/15/1975
• Status: Expired due to Term

• Current Assignee: Robert Bosch GmbH
• Original Assignee: Robert Bosch GmbH
• Inventors: Langenberger, Peter, Fromel, Gerhard
• Primary Examiner(s): Love, John J.
• Assistant Examiner(s): Kashnikow, Andres
• Application Number:
  US05/648,481
• Time in Patent Office: 538 Days
• Field of Search: 239/86, 239/88-91, 239/93-96, 239/102, 239/451, 239/452, 239/453, 239/459, 239/533, 239/584, 239/585, 239/574, 239/518, 239/524, 123/32 AE
• US Class Current: 239/381
• CPC Class Codes: F02M 2200/505 Adjusting spring tension by sliding spring seats
• CPC Class Codes: F02M 51/0685 the armature and the valve being allowed to move relatively to each other or not being attached to each other
• CPC Class Codes: F02M 51/08 specially for low-pressure fuel-injection
• CPC Class Codes: F02M 61/08 the valves opening in direction of fuel flow F02M61/047 takes precedence

Abstract

A fuel injection valve for an internal combustion engine has a main fuel valve formed by a needle urged against a valve seat by a spring and also includes a solenoid to pull the valve needle away from the seat for fuel metering purposes. In addition, the valve has an extension in which a pestle with two enlarged ends is axially carried in two spring support cups. The enlarged ends of the pestle also act as valves in such a manner that even low fuel-flow causes a fluttering of the pestle, resulting in good fuel atomization.

Claims

1. A fuel injection valve for an internal combustion engine, said valve including a housing, and within the housing a coaxial arrangement of an internal solenoid coil, a magnetic core, a movable armature, a valve seat member, and a valve needle carried by said armature and cooperating with the valve seat in said valve seat member for metering fuel past the valve seat member, the improvement comprising:

a connecting cylinder, attached to said valve housing; and

a mechanical fuel preparation means, located in said connecting cylinder separately from and downstream of said valve seat member and said valve needle, said connecting cylinder further including a first spring support cup;

a pestle with two enlarged ends, one of said ends penetrating a central hole in said first support cup;

a second spring support cup with a central hole penetrated by the second of said two enlarged ends of said pestle; and

a spring, disposed between and urging apart said first and said second spring support cups, thereby pressing them against the enlarged ends of said pestle.

2. A fuel injection valve as defined by claim 1, wherein said connecting cylinder conforms to the geometrical requirements of the internal combustion engine.

3. A fuel injection valve as defined in claim 1, wherein said first spring support cup has a central valve seat cooperating with one enlarged end of said pestle to thereby form a fuel outlet valve and wherein said central hole in said first spring support cap is larger than the diameter of said pestle, thereby permitting penetration with radial clearance.

4. A fuel injection valve as defined by claim 3, wherein said first spring support cup is fixedly positioned in said connecting cylinder.