Cylinder head for an in-cylinder injection spark-ignition type i

Internal-combustion engines – Combustion chamber means having fuel injection only – Injected fuel spraying into whirling fluid

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123302, 123305, 73 46, 73 497, 73119A, F02B 302, F02M 6500, G01M 1500

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058162151

ABSTRACT:
A cylinder head for an in-cylinder injection spark-ignition type internal combustion engine is formed with an injection passage for providing communication between a fuel injection valve and a combustion chamber. The injection passage includes a first and second passage sections disposed on the fuel injection valve side and on the combustion chamber side. The first passage section is formed, for example, into a truncated cone shape or a right circular cylindrical shape so that the cross sectional area decreases toward the fuel injection valve side or the area is constant over its entire length. The second passage section is formed to have the cross sectional area which increases toward the combustion chamber side. The fuel injected from the fuel injection valve flows into the combustion chamber via the injection passage having a gradually increasing cross sectional area, so that turbulence of fuel spray due to sudden divergent flow does not occur, resulting in an improved fuel combustion efficiency. Also, a seal seating face is formed on the inner face of the first passage section. By using a seal jig having a shape complementary to the seal seating face, a pressure leak test of cylinder head and a fuel leak test of fuel system can be achieved reliably and easily.

REFERENCES:
patent: 5195362 (1993-03-01), Eason
patent: 5305720 (1994-04-01), Ando et al.
patent: 5335635 (1994-08-01), Kadoi et al.

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