Engine and personal watercraft
AssigneeKawasaki Jukogyo Kabushiki Kaisha
InventorsAtsufumi Ozaki, Yasuo Okada, Hideaki Ebisui
Life of this patent
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Abstract
An engine for a personal watercraft uses an open-looped cooling system and comprises a cylinder block having a water jacket within which cooling water flows, and a piston that reciprocates within the cylinder block, and a dimension of the water jacket in a reciprocation direction of the piston is equal to or less than a half of a reciprocation distance of the piston.
Claims18
An engine for a personal watercraft, comprising:
- an open-looped cooling system configured to take in water from outside the watercraft, for use as cooling water to cool the engine and thereafter discharge the cooling water outside the watercraft;
- a cylinder block having a water jacket formed inside thereof, the water jacket being coupled to the open looped cooling system such that the cooling water flows through the water jacket;
- a cylinder head connected to an upper end face of the cylinder block so as to form a combustion chamber;
- and
- a piston that reciprocates within cylinder block;
- wherein the water jacket is provided in an uppermost end portion of the cylinder block so as to surround the piston, the water jacket being formed so as to open into the upper end face of the cylinder block facing the cylinder head;
- and
- wherein the water jacket extends downward from the upper end face of the cylinder block, and a dimension of the water jacket from the upper end face of the cylinder block to a lowermost portion of the water jacket in a reciprocation direction of the piston is equal to or less than a half of a reciprocation distance of the piston so that excess cooling of the cylinder block is inhibited.
A personal watercraft comprising:
- a water jet pump configured to propel the watercraft;
- an engine configured to drive the water jet pump;
- and
- a cooling system configured to cool the engine with water;
- wherein the cooling system has at least two water-drawing passages through which the water is drawn from an inside of the water jet pump for use as cooling water;
- and
- wherein at least one of the water drawing passages is configured to extend from the water jet pump to the engine through an auxiliary device.
A personal watercraft comprising:
- a water jet pump configured to propel the watercraft;
- an engine configured to drive the water jet pump;
- and
- a cooling system configured to cool the engine with water;
- wherein the cooling system has at least two water drawing passages through which the water is drawn from an inside of the water jet pump for use as cooling water,
- and wherein a plurality of water drawing holes of the water drawing passages are circumferentially arranged on an outer periphery of the water jet pump.
An engine for a personal watercraft having an open-looped cooling system configured to take in water from outside the watercraft, for use as cooling water to cool the engine and thereafter discharge the cooling water outside the watercraft, the engine comprising:
- a cylinder block having a water jacket within which the cooling water flows;
- a piston that reciprocates within the cylinder block, wherein a dimension of the water jacket in a reciprocation direction of the piston is equal to or less than a half of a reciprocation distance of the piston;
- and
- a cylinder head provided on the cylinder block and configured to form a combustion chamber;
- wherein the cylinder block and the cylinder head are configured to be cooled by cooling water, and the cylinder block is placed downstream of the cylinder head in a flow direction of the cooling water in the cooling system.
A personal watercraft comprising:
- a water jet pump configured to propel the watercraft;
- an engine configured to drive the water jet pump;
- and
- a cooling system configured to cool the engine with water;
- wherein the cooling system has at least two water drawing passages through which the water is drawn from an inside of the water jet pump for use as cooling water;
- and
- wherein the engine comprises a cylinder block and a cylinder head configured to be cooled by the cooling water, and the cylinder block is placed downstream of the cylinder head in a flow direction of the cooling water in the cooling system.
Dependencies are inferred from the claim text.