Piston cooling structure in combustion engine
AssigneeKawasaki Jukogyo Kabushiki Kaisha
InventorsHiroyuki Watanabe, Hisatoyo Arima
Life of this patent
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Abstract
A piston cooling structure for an engine includes a first nozzle and a second nozzle for injecting a cooling liquid towards a back face of a piston that reciprocally move within a cylinder bore along a cylinder axis line. The first angle of inclination of an axis of the first nozzle relative to the cylinder axis line is set to be smaller than the second angle of inclination of an axis of the second nozzle relative to the cylinder axis line.
Claims18
A piston cooling structure for a combustion engine which comprises:
- first and second nozzles configured to inject a cooling liquid towards a back face of a piston which reciprocatingly moves along a cylinder axis line within a cylinder bore, the first and second nozzles having axes that are inclined at first and second angles relative to the cylinder axis line, respectively,
- in which the first angle of inclination relative to the cylinder axis line is set to a value smaller than the second angle of inclination relative to the cylinder axis line, and
- in which regardless of the position of the piston then reciprocatingly moving along the cylinder axis line, the first nozzle injects the cooling liquid intensively towards a portion of the back face of the piston, which portion is adjacent to an exhaust port, and the second nozzle has a second injection amount which is set to a value larger than a first injection amount of the first nozzle.
A piston cooling structure for a combustion engine which comprises:
- first and second nozzles configured to inject a cooling liquid towards a back face of a piston which reciprocatingly moves along a cylinder axis line within a cylinder bore, the first and second nozzles having axes that are inclined at first and second angles relative to the cylinder axis line, respectively,
- in which the first angle of inclination relative to the cylinder axis line is set to a value smaller than the second angle of inclination relative to the cylinder axis line,
- in which the combustion engine comprises:
- a crankshaft drivingly connected with the piston;
- and a crankcase to support the crankshaft,
- in which a first injection port of the first nozzle is constituted by a pipe fluidly connected with the cylinder and protruding radially inwardly of the cylinder from a cylinder wall surface, and
- in which a second injection port of the second nozzle is formed in a wall surface of the crankcase.
A piston cooling structure for a combustion engine which comprises:
- first and second nozzles configured to inject a cooling liquid towards a back face of a piston which reciprocatingly moves along a cylinder axis line within a cylinder bore, the first and second nozzles having axes that are inclined at first and second angles relative to the cylinder axis line, respectively,
- in which the cooling liquid supplied to the first nozzle has a temperature set to a lower value than the temperature of the cooling liquid supplied to the second nozzle,
- in which a first supply pressure of the cooling liquid supplied to the first nozzle is set to a value higher than a second supply pressure of the cooling liquid supplied to the second nozzle, or
- in which the first nozzle has a first injection port defined therein and the second nozzle has a second injection port defined therein, the first injection port having a bore size which is set to a value smaller than a bore size of the second injection port.
Dependencies are inferred from the claim text.