Cylinder head cooling construction for an internal combustion engine

A cylinder head cooling construction for an internal combustion engine with cylinders and a crankshaft,

• wherein a coolant jacket through which coolant is allowed to flow is formed by a wall of a cylinder head including bottom walls forming chamber walls of combustion chambers, upper walls, intake port walls forming intake ports having intake valve ports which are opened and closed by intake valves and exhaust port walls forming exhaust ports having exhaust valve ports which are opened and closed by exhaust valves,
• wherein deflecting ribs are formed in said coolant jacket between intake-valve-port side port wall portions and exhaust-valve-port side port wall portions which are situated downstream of said intake-valve-port side port wall portions in a flow direction of said coolant for directing said flow of coolant toward said exhaust-valve-port side port wall portions, and
• wherein said deflecting ribs for deflecting part of said flow of coolant which flows in a cylinder head center line direction toward said exhaust-valve-port side port wall portions between said intake-valve-port side port wall portions and said exhaust-valve-port side port wall portions extend downwardly from said upper walls and extend toward said intake-valve-port side port wall portions and said exhaust-valve-port side port wall portions, and said deflecting ribs are formed to leave gaps between lower end portions of said deflecting ribs and said exhaust-valve-port side port wall portions and said bottom walls for allowing said coolant to flow on wall surfaces of said exhaust-valve-port side port wall portions and wall surfaces of said bottom walls.

A cylinder head for an internal combustion engine, comprising:

• bottom walls forming chamber walls of combustion chambers;
• intake port walls forming intake ports having intake valve ports which are opened and closed by intake valves;
• exhaust port walls forming exhaust ports having exhaust valve ports which are opened and closed by exhaust valves, so that a coolant jacket through which coolant is allowed to flow is formed by said bottom walls, said intake port walls and said exhaust port walls;
• and
• deflecting ribs formed within said coolant jacket between intake-valve-port side port wall portions and exhaust-valve-port side port wall portions of said adjacent combustion chambers which are situated downstream of said intake-valve-port side port wall portions in a flow direction of said coolant, said deflecting ribs being protruded upwardly from said bottom walls,
• wherein at least one of said deflecting ribs defines a gap in at least one of a first position between said intake-valve-port side port wall portion and said deflection rib, a second position between said exhaust-valve-port side port wall portion and said deflecting rib, and a third position being an intermediate position of said deflecting ribs extending from both of said intake-valve-port side port wall portion and said exhaust-valve-port side port wall portion.

A cylinder head for an internal combustion engine, comprising:

• bottom walls forming chamber walls of combustion chambers;
• upper walls;
• intake port walls forming intake ports having intake valve ports which are opened and closed by intake valves;
• exhaust port walls forming exhaust ports having exhaust valve ports which are opened and closed by exhaust valves, so that a coolant jacket through which coolant is allowed to flow is formed by said bottom walls, said upper walls, said intake port walls and said exhaust port walls;
• and
• deflecting ribs formed within said coolant jacket between intake-valve-port side port wall portions and exhaust-valve-port side port wall portions of said adjacent combustion chambers which are situated downstream of said intake-valve-port side port wall portions in a flow direction of said coolant,
• wherein said deflecting ribs extend downwardly from said upper walls and extend toward said intake-valve-port side port wall portions and said exhaust-valve-port side port wall portions, respectively, and
• further wherein at least one of said deflecting ribs is formed to define a gap between a lower end portion of said deflecting rib and said exhaust-valve-port side port wall portion and said bottom wall.