Cooling system for an internal combustion engine

A cooling system for an internal combustion engine comprising:

• a supply source of a coolant for cooling a cylinder liner;
• a plurality of annular passages formed between a cylinder block and said cylinder liner fitted in the cylinder block, the passages extending along a circumference of an outer surface of said cylinder liner, said passages being spaced apart from each other in an axial direction of said cylinder liner;
• an inflow and an outflow passage for a coolant, connecting said plurality of annular passages, extending in a direction of an axis of said cylinder liner, and provided at diametrically opposite sides of said cylinder liner;
• an inlet passage for supplying a coolant to said inflow passage;
• introducing means for directing a flow of coolant into said annular passages and for preventing stagnation of the coolant when the coolant is introduced to said annular passages;
• and
• wherein said introducing means comprises guiding members provided on a surface of said inflow passage and positioned in an upper half portion of all but one of said annular passages.

A cooling system for an internal combustion engine comprising:

• a supply source of a coolant for cooling a cylinder liner;
• a plurality of annular passages, formed between a cylinder block and said cylinder liner fitted in the cylinder block, the passages extending along a circumference of an outer surface of said cylinder liner, said passages being spaced apart from each other in an axial direction of said cylinder liner;
• an inflow and an outflow passage for a coolant, connecting said plurality of annular passages, extending in a direction of an axis of said cylinder liner, and provided at diametrically opposite sides of said cylinder liner;
• an inlet passage for supplying a coolant to said inflow passage;
• introducing means for directing a flow of coolant into said annular passages and for preventing stagnation of the coolant when the coolant is introduced to said annular passages;
• and
• wherein said introducing means comprises connecting ports connecting adjacent ones of said annular passages, the ports being provided within a predetermined angle range from a line, which is a line passing through a center of a vertical section of said inflow passage and passing through a center of the cylinder liner.

A cooling system for an internal combustion engine comprising:

• a supply source of a coolant for cooling a cylinder liner;
• a plurality of annular passages formed between a cylinder block and said cylinder liner fitted in the cylinder block, the passages extending along a circumference of an outer surface of said cylinder liner, said passages being spaced apart from each other in an axial direction of said cylinder liner;
• an inflow and an outflow passage for a coolant, connecting said plurality of annular passages, extending in a direction of an axis of said cylinder liner, and provided at diametrically opposite sides of said cylinder liner;
• an inlet passage for supplying a coolant to said inflow passage;
• introducing means for directing a flow of coolant into said annular passages and for preventing stagnation of the coolant when the coolant is introduced to said annular passages;
• and
• wherein said introducing means comprises a plurality of protrusions, wherein one of said protrusions is formed on an upper wall of all but one of said annular passages, the height of said protrusions decreasing gradually toward the downstream portion of said annular passages so that a curve of each of said protrusions matches a stream line of a coolant.

A cooling system for an internal combustion engine comprising:

• a supply source of a coolant for cooling a cylinder liner;
• a plurality of annular passages formed between a cylinder block and said cylinder liner fitted in the cylinder block, the passages extending along a circumference of an outer surface of said cylinder liner, said passages being spaced apart from each other in an axial direction of said cylinder liner;
• an inflow and an outflow passage for a coolant, connecting said plurality of annular passages, extending in a direction of an axis of said cylinder liner, and provided at diametrically opposite sides of said cylinder liner;
• an inlet passage for supplying a coolant to said inflow passage;
• introducing means for directing a flow of coolant into said annular passages and for preventing stagnation of the coolant when the coolant is introduced to said annular passages;
• and
• wherein said introducing means comprises a plurality of slanting surfaces, wherein one of said slanting surfaces is provided for all but one of said annular passages of said cylinder liner, said slanting surfaces slanting so that a width of the upper portion of said one annular passage is larger than the widths of the upper portions of the other annular portions.