Exhaust manifold expansion slot for internal combustion motor
AssigneeOutboard Marine Corporation
InventorsGregory J. Binversie, Frederick J. Debettignies, Charles F. Erbach
Life of this patent
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Abstract
A multiple cylinder internal combustion cylinder block having a cast exhaust manifold means integrally cast with the block is disclosed. The manifold means includes manifold port portions that communicate with the cylinder bores, and an expansion slot is provided in the manifold port portions adjacent the cylindrical bores to relieve stress that tends to distort the cylindrical bores of the block.
Claims15
A multiple cylinder block of the type which is used in marine and other internal combustion motors, said cylinder block comprising:
- a unitary casting in which at least two cylindrically shaped cylinder bores are provided, in which pistons are adapted to be located with the casting having cast cylinder walls around the bores and outer walls spaced from said cast cylinder walls;
- said casting having a hollow exhaust manifold means with a manifold port portion associated with each cylinder bore, said manifold means being adapted to exhaust gases from said cylinders that are produced during operation of the motor;
- said casting having a recess extending around substantially the entire periphery of the inside of each said manifold port portion associated with each cylinder bore, each said recess being located between the cast cylinder wall and the outer wall of said casting.
A multiple cylinder motor block for an internal combustion motor, said cylinder block comprising:
- a unitary casting having at least two cylindrically shaped cylinder bores in which reciprocating motor pistons are adapted to be located, with the casting having cast cylinder walls around the bores and outer walls spaced from said cast cylinder walls, the spaces between the cast cylinder walls and the outer walls defining passages in which cooling fluid can pass for cooling the motor during operation;
- said casting having a hollow exhaust manifold means with a manifold portion having an internal exhaust passage associated with each cylinder bore, said manifold means being adapted to exhaust gases from said cylinders that are produced during operation of the motor;
- said casting having a recessed slot extending around substantially the entire periphery of the inside of each said manifold port portion associated with each cylinder bore, each said recessed slot being located between the cast cylinder wall and the outer wall of said casting.
A multiple cylinder motor block for an internal combustion motor, said motor block comprising:
- a unitary casting having a plurality of cylindrically shaped cylinder bores in which reciprocating motor pistons are adapted to be located, with the casting having cast cylinder walls around the bores and outer walls spaced from said cast cylinder walls, the spaces between the cast cylinder walls and the outer walls defining passages in which cooling fluid can pass for cooling the motor during operation;
- said casting having at least one hollow exhaust manifold means with a manifold portion having an internal exhaust passage associated with each cylinder bore, said manifold means having at least one outlet portion adapted to exhaust gases from said cylinders that are produced during operation of the motor, the manifold portions associated with at least two cylinder bores being in communication with one another and with said outlet portion;
- said casting having an expansion slot extending around substantially the entire periphery of the inside of each said manifold port portion associated with each cylinder bore, each said recessed slot being located between the cast cylinder wall and the outer wall of said casting and being adapted to relieve stress on said cast cylinder walls caused by heat expansion of said manifold port portions on the side of said expansion slot located away from said cylinder bore.
Dependencies are inferred from the claim text.