Fuel injection valve

• US 6,616,071 B2
• Filed: 10/24/2001
• Issued: 09/09/2003
• Est. Priority Date: 10/24/2000
• Status: Expired due to Term

• Current Assignee: Keihin Corporation (Hitachi, Ltd.)
• Original Assignee: Keihin Corporation (Hitachi, Ltd.)
• Inventors: Kitamura, Koji, Arioka, Akira
• Primary Examiner(s): EVANS, ROBIN OCTAVIA
• Application Number:
  US09/983,545
• Publication Number:
  US 20020063175A1
• Time in Patent Office: 685 Days
• Field of Search: 239/533.12, 239/533.14, 239/585.1, 239/585.2, 239/585.3, 239/585.4, 239/585.5, 239/596, 239/900
• US Class Current: 239/533.12
• CPC Class Codes: F02M 35/10216 Fuel injectors; Fuel pipes or rails; Fuel pumps or pressure regulators
• CPC Class Codes: F02M 35/1085 the combustion chamber having multiple intake valves modifying induction systems for imparting a rotation to the charge in the cylinder and having multiple air inlets F02B31/08; shape or arrangement of intake or exhaust channels in cylinder heads F02F1/42
• CPC Class Codes: F02M 51/0682 the body being hollow and its interior communicating with the fuel flow F02M51/0675 takes precedence
• CPC Class Codes: F02M 61/1853 Orifice plates
• CPC Class Codes: F02M 69/044 for injecting into the intake conduit downstream of an air throttle valve
• CPC Class Codes: Y10S 239/90 Electromagnetically actuated fuel injector having ball and seat type valve

Abstract

A fuel injection valve includes a valve seat member having a valve bore, and an injector plate coupled to an outer end face of the valve seat member. A fuel diffusion chamber is defined between the valve seat member and the injector plate. The injector plate is provided with a plurality of fuel injection bores which are parted on a plane including an axis of the valve bore into primary and secondary groups for injecting fuel toward primary and secondary intake ports. When a direction of arrangement of the primary and secondary intake ports is represented by X, and a direction perpendicular to the direction of arrangement is represented by Y, the fuel injection bores of the primary and secondary groups are formed so that they are inclined to a side opposite from the axis of the valve bore only in a direction X toward a downstream side.

Claims

1. A solenoid-type fuel injection valve comprising:

a valve seat member having a valve seat and a valve bore provided through a center portion of said valve seat;

a valve stem for opening and closing said valve bore by cooperation with said valve seat;

an injector plate coupled to an outer end face of said valve seat member and having a plurality of fuel injection bores disposed around an axis of said valve bore; and

a fuel diffusion chamber which is defined between said valve seat member and said injector plate so as to have a diameter larger than that of said valve bore and which is faced by said valve bore and all of said fuel injection bores, said plurality of fuel injection bores being all located radially outside of said valve bore and being parted on a plane including the axis of said valve bore into a primary group of fuel injection bores and a secondary group of fuel injection bores for injecting fuel toward a pair of primary and secondary intake ports, respectively,

wherein the fuel injection bores of the primary group are formed so that they are inclined to a side opposite and away from the axis of said valve bore only in a direction X toward a downstream side, and the fuel injection bores of the secondary group are formed so that they are inclined to a side opposite and away from the axis of said valve bore only in said direction X toward the downstream side, wherein said direction X represents a direction of arrangement of said primary and secondary ports in the internal combustion engine, and a direction Y represents a direction perpendicular to said direction of arrangement, and

wherein the fuel injection bores of the primary group are sub-classified into a primary inner group of fuel injection bores, and a primary outer group of fuel injection bores disposed on opposite sides of the fuel injection bores of the primary inner group in the direction Y at locations where an axis distance between the fuel injection bore of the primary outer group and said valve bore is smaller than that between the fuel injection bore of the primary inner group and said valve bore, and the fuel injection bores of the secondary group are sub-classified into a secondary inner group of fuel injection bores, and a secondary outer group of fuel injection bores disposed on opposite sides of the fuel injection bores of the secondary inner group in the direction Y at locations where an axis distance between the fuel injection bore of the secondary outer group and said valve bore is smaller than that between the fuel injection bore of the secondary inner group and said valve bore.

2. A fuel injection bore according to claim 1, wherein the fuel injection bores of at least one of said primary outer group and secondary outer group are formed at a diameter smaller than that of the fuel injection bores of the corresponding inner group.

3. A fuel injection valve according to claim 1 or 2, wherein the total of cross-sectional areas of the fuel injection bores of said primary inner group and said primary outer group are set larger than that of cross-sectional areas of the fuel injection bores of said secondary inner group and said secondary outer group.

4. A fuel injection valve according to claim 1 or 2, wherein the relationship between the thickness t of said injector plate and the minimum diameter d of the fuel injection bores of said primary and secondary groups is set at t/d<

1.