Patent ID: 7137364
Filing Date: 2006-11-21
Classification: B63B,B63H,F01P

Abstract:
1. A cooling system of an engine for a personal watercraft, the cooling system being an open-looped cooling system configured to take in water from outside the watercraft for use as cooling water to directly cool the engine, the cooling system comprising: a cylinder head including a first water jacket through which the cooling water flows, a cooling water inlet through which the first water jacket communicates with outside, and a first cooling water outlet through which the first water jacket communicates with outside; a cylinder block including a second water jacket through which the cooling water within the first water jacket flows, the second water jacket being configured to communicate with the first water jacket, and a second cooling water outlet through which the second water jacket communicates with outside; a thermostat configured to control a flow rate of the cooling water flowing out from the second cooling water outlet of the cylinder block based on a temperature of the cooling water; an exhaust pipe that has a water jacket through which the cooling water flows and is connected to the cylinder head; and two cooling water supply systems configured to supply the cooling water to the water jacket of the exhaust pipe from outside of the watercraft, the two cooling water supply systems respectively having cooling water pipes through which the cooling water is supplied; wherein the cooling water inlet of the cylinder head is configured to open in a connecting end face between the cylinder head and the exhaust pipe, and is configured to communicate with the water jacket of the exhaust pipe through the connecting end face.