Direct fuel injection stratified charge engine

• US 5,605,125 A
• Filed: 02/06/1995
• Issued: 02/25/1997
• Est. Priority Date: 11/18/1994
• Status: Expired due to Fees

• Current Assignee: Yasuhito Yaoita
• Original Assignee: Yasuhito Yaoita
• Inventors: Yaoita, Yasuhito
• Primary Examiner(s): Kamen, Noah P.
• Application Number:
  US08/383,844
• Time in Patent Office: 750 Days
• Field of Search: 123/261, 123/275, 123/295, 123/661, 123/298
• US Class Current: 123/275
• CPC Class Codes: F02B 1/04 with fuel-air mixture admission into cylinder
• CPC Class Codes: F02B 17/005 having direct injection in the combustion chamber
• CPC Class Codes: F02B 19/108 with fuel injection at least into pre-combustion chamber, i.e. injector mounted directly in the pre-combustion chamber
• CPC Class Codes: F02B 2023/085 using several spark plugs per cylinder
• CPC Class Codes: F02B 2023/103 the injector having a multi-hole nozzle for generating multiple sprays
• CPC Class Codes: F02B 2023/108 Swirl flow, i.e. the axis of rotation of the main charge flow motion is vertical
• CPC Class Codes: F02B 2075/025 two
• CPC Class Codes: F02B 2075/027 four
• CPC Class Codes: F02B 2075/125 Direct injection in the combustion chamber for spark ignition engines, i.e. not in pre-combustion chamber
• CPC Class Codes: F02B 2275/40 Squish effect
• CPC Class Codes: F02B 23/101 the injector being placed on or close to the cylinder centre axis, e.g. with mixture formation using spray guided concepts
• CPC Class Codes: F02B 23/104 the injector being placed on a side position of the cylinder
• CPC Class Codes: F02B 23/105 the fuel is sprayed directly onto or close to the spark plug
• CPC Class Codes: F02B 3/02 with positive ignition with non-timed positive ignition F02B9/06
• CPC Class Codes: F02F 1/242 Arrangement of spark plugs or injectors
• CPC Class Codes: F02F 1/4221 particularly for three or more inlet valves
• CPC Class Codes: F02F 2001/245 the valve stems being orientated at an angle with the cylinder axis
• CPC Class Codes: F02F 2001/247 the valve stems being orientated in parallel with the cylinder axis
• CPC Class Codes: F02F 3/26 having combustion chamber in piston head the surface thereof being covered F02F3/14
• CPC Class Codes: Y02T 10/12 Improving ICE efficiencies

Abstract

A Stratified Charge Engine where the main combustion chamber is made into one part of the cylinder head is described. The main combustion chamber in this engine is smaller than in Pre-Mixture Combustion Engines. Other main features of this engines are direct fuel injection, installation of a squish area and prevention of combustion in the end-gas zone. The thermal load and the weight of the piston in this engine are lower than in normal Stratified Charge Engines with fuel jet impingement. The fuel jet is kept inside the main combustion chamber, resulting in an higher anti-knocking quality of this engine as compared to Pre-Mixture Combustion Engines.

Claims

1. A direct fuel injection stratified charge engine comprising:

a cylinder block defining a cylinder;

a piston located in said cylinder;

a cylinder head on said cylinder block;

said cylinder head defining a squish surface facing said piston, and a pocket defining a main combustion chamber facing said piston;

a spark plug in said main combustion chamber, wherein the greatest spacing between electrodes of the spark plug and any portion of said pocket is less than the radius of said cylinder; and

a fuel injector disposed in one of said head and block, said fuel injector adapted to direct a stream of fuel to obliquely deflect off a surface of said cylinder head adjacent said main combustion chamber and then into said main combustion chamber.

2. The direct fuel injection stratified charge engine as claimed in claim 1, further comprising a projection formed on an inner wall of said main combustion chamber, said fuel from the fuel injector impinging a surface of said projection and being dispersed from an edge of said surface.

3. The direct fuel injection stratified charge engine as claimed in claim 1, further comprising an edge formed on an inner wall of said cylinder head where the squish surface forms, said fuel from the fuel injector impinging said inner wall and being dispersed from said edge.

4. The direct fuel injection stratified charge engine as claimed in claim 3, wherein an intersection of said edge is made at said main combustion chamber and the surface.

5. The direct fuel injection stratified charge engine as claimed in claim 1, wherein a plurality of said main combustion chambers are installed in parts of said inner wall of said cylinder head in one cylinder;

further squish surfaces are made between said plurality of main combustion chambers; and

a multiple hole injector is installed at an inner wall which faces an upper portion of a space in said cylinder excluding said main combustion chambers.