Magnetic type fuel injection valve

• US 4,331,317 A
• Filed: 05/29/1980
• Issued: 05/25/1982
• Est. Priority Date: 06/05/1979
• Status: Expired due to Term

• Current Assignee: Nippondenso Co., Ltd. (DENSO Corporation)
• Original Assignee: Nippondenso Co., Ltd. (DENSO Corporation)
• Inventors: Omori, Norio, Kamai, Kenichiro, Nishioka, Shinichi
• Primary Examiner(s): Rosenthal, Arnold
• Application Number:
  US06/154,460
• Time in Patent Office: 726 Days
• Field of Search: 251/141, 251/139, 239/585, 403/379
• US Class Current: 251/129.21
• CPC Class Codes: F02M 51/0678 all portions having fuel passages, e.g. flats, grooves, diameter reductions
• CPC Class Codes: F02M 51/08 specially for low-pressure fuel-injection
• CPC Class Codes: F02M 61/168 Assembling; Disassembling; Manufacturing; Adjusting
• CPC Class Codes: Y10T 403/7086 Wedge pin

Abstract

A magnetic type fuel injection valve comprises a stationary core magnetized upon energization of a magnetic coil, and a movable core juxtaposed at one end to the stationary core to be normally urged away therefrom by a spring and formed at the other end with an axial bore for receiving one end of a needle valve normally closing a fuel injection nozzle. The movable core is movable as being attracted toward the stationary core together with the needle valve upon magnetization of the stationary core to thereby open the fuel injection nozzle. Through the wall portion of the movable core surrounding the axial bore is formed a transverse hole extending perpendicularly to the axial bore, and another transverse hole is formed through the one end of the needle valve in a manner to align with the first-mentioned transverse hole. A securing pin is snugly fitted in the transverse holes to securely connect the needle valve to the movable core.

Claims

1. A magnetic type fuel injection valve comprising:

a magnetic coil;

a stationary core adapted to be magnetized upon energization of said magnetic coil;

a movable core having one end opposed to one end of said stationary core and being formed with an axial bore open to the other end of said movable core remote from said stationary core, said movable core being movable toward said one end of said stationary core upon magnetization of said stationary core, said axial bore having an end face opposite an opening to the other end;

a needle valve having one end fitted in said axial bore and movable with said movable core to open and close a fuel injection port, said needle valve one end having a face directly abutting said axial bore end face;

a first hole formed through the wall of said movable core surrounding said axial bore and extending substantially perpendicularly to said axial bore;

a second hole formed in said one end of said needle valve to substantially align with said first hole; and

an elongated number having, in its free condition, an outer diameter slightly larger than said first and said second holes whereby said member is tightly fitted in said first and second holes to securely connect said needle valve to said movable core.

2. A magnetic type fuel injection valve as set forth in claim 1, wherein said elongated member includes a spring pin formed of spring steel of a curved, coil-like cross section.