FUEL INJECTION INTERNAL COMBUSTION ENGINE

• US 3,797,466 A
• Filed: 07/21/1971
• Issued: 03/19/1974
• Est. Priority Date: 09/08/1970
• Status: Expired due to Term

• Current Assignee: Shyuya Nambu
• Original Assignee: Shyuya Nambu
• Inventors: Nambu, Shyuya
• Primary Examiner(s): Goodridge, Laurence M.
• Assistant Examiner(s): Flint, Cort
• Application Number:
  US05/164,770
• Time in Patent Office: 972 Days
• Field of Search: 123/32ST,32SP,32SJ,191S,193CP,193P
• US Class Current: 123/256
• CPC Class Codes: F02B 2023/102 the spark plug being placed offset the cylinder centre axis
• 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 2075/125 Direct injection in the combustion chamber for spark ignition engines, i.e. not in pre-combustion chamber
• CPC Class Codes: F02B 23/10 with separate admission of air and fuel into cylinder
• 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

To make available a fuel internal combustion engine which can be driven with a relatively lean combustible mixture to reduce concentrations of toxic hydrocarbons, carbon-monoxides and nitrogen oxides in engine exhaust gases without impairing combustion efficiency of the engine, the engine is provided with an improved combustion chamber which consists of a usual space usually used as the combustion chamber and an additional space formed in an end wall of a piston. A fuel injection valve and a spark plug spaced from the valve are located in alignment with this additional space so that a major portion of the supplied fuel is distributed to the additional space so as to produce therein a relatively rich combustible mixture which can be readily ignited by the spark plug whereby a relatively lean mixture produced in the usual space of the combustion chamber is ignited by the aid of the flames resulting from the combustion of the rich mixture.

Claims

1. A fuel injection internal combustion engine for motor vehicles in which each cylinder arrangement comprises:

a cylinder;

a cylinder head mounted on said cylinder, said cylinder head defining a flat plane which defines the upper limits of the cylinder;

an air intake passage having a downstream end portion curved and opening into said cylinder at said cylinder head to provide a curved flow of air in said cylinder;

a piston within said cylinder to provide a space between said cylinder head and said piston, said piston having formed in its end wall facing said cylinder head a groove which is immediately contiguous to said space to provide a combustion chamber, said groove extending along said flow of air and having an upstream portion and a downstream portion with respect to said flow of air;

a fuel injection nozzle mounted in said cylinder head and disposed above said upstream portion;

a spark plug mounted in said cylinder head and having a central electrode projecting into said groove at said downstream portion when said piston is at top dead center;

an exhaust port leading from said combustion chamber and opened to the open air; and

wherein said groove is curved about an axis of said piston to form a curved groove having closed end.

2. A fuel injection internal combustion engine as claimed in claim 1, wherein said groove extends annularly to form an annular groove.

3. A fuel injection internal combustion engine as claimed in claim 1, wherein said fuel injection valve is angled to admit fuel into said combustion chamber in a direction substantially in line with the direction in which said groove extends toward said central electrode.