Cylinder head

Abstract

The present invention provides a cylinder head that can improve cooling performance while suppressing the increase in pressure loss within the water jacket. [Solution] The cylinder head has a mounting hole for a spark plug that opens into the wall surface defining the combustion chamber of the internal combustion engine, an intake port and an exhaust port provided on opposite sides of the mounting hole, a first flow path for cooling water connected from the combustion chamber side to the water jacket in the cylinder block, adjacent to the intake port and extending along the wall surface toward the mounting hole, and a second flow path for cooling water connected from the combustion chamber side to the water jacket, adjacent to the exhaust port and extending along the wall surface toward the mounting hole, and at least one of the first and second flow paths has a protrusion, the protrusion protruding in a direction inclined toward the combustion chamber with respect to the adjacent direction between the port adjacent to at least one of the intake port and exhaust port and at least one of the flow paths.

Claims

1. In the cylinder head of an internal combustion engine, An opening in the wall that defines the combustion chamber of the internal combustion engine, and a mounting hole into which the spark plug of the internal combustion engine is attached, An intake port and an exhaust port are provided on opposite sides of the aforementioned mounting hole, A first flow path for cooling water is connected from the combustion chamber side to the water jacket in the cylinder block of the internal combustion engine, adjacent to the intake port, and extending along the wall surface toward the mounting hole, It has a second flow path for cooling water that is connected from the combustion chamber side to the water jacket in the cylinder block, is adjacent to the exhaust port, and extends along the wall surface toward the mounting hole, Of the first channel and the second channel, at least one of the channels is provided with a protrusion, The aforementioned protrusions project in a direction inclined toward the combustion chamber with respect to the adjacent direction between the intake port and the exhaust port adjacent to at least one of the flow paths, Cylinder head.

2. The at least one of the flow channels has a straight section on the upstream side of the protrusion. The cylinder head according to claim 1.

3. Ports adjacent to at least one of the aforementioned flow paths are provided on the opposite side of the direction in which the protrusion protrudes from the protrusion. A cylinder head according to claim 1 or 2.

4. The surface of the aforementioned protrusion has a curved shape. A cylinder head according to claim 1 or 2.

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