OUTBOARD MOTOR

• Main Authors: TAWA HIROKI, FUKUDA YOSHIHIKO
• Format: Patent
• Language: English
• Published: 20.01.2005
• Edition: 7
• Subjects: BLASTING; COMBUSTION ENGINES; COMBUSTION ENGINES IN GENERAL; COOLING OF INTERNAL-COMBUSTION ENGINES; COOLING OF MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; HEATING; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS; INTERNAL-COMBUSTION PISTON ENGINES; LIGHTING; MACHINES OR ENGINES IN GENERAL; MARINE PROPULSION OR STEERING; MECHANICAL ENGINEERING; PERFORMING OPERATIONS; RELATED EQUIPMENT; SHIPS OR OTHER WATERBORNE VESSELS; STEAM ENGINES; TRANSPORTING; WEAPONS

PROBLEM TO BE SOLVED: To prevent cooling water from remaining in the vicinity of a relief valve when an engine of an outboard motor stops. SOLUTION: This outboard motor is constituted in such a way that a first opening 35d communicating with a cooling water discharge passage 35f and a second opening 35e communicating with a cooling water supply passage 35a are formed to be adjacent to each other on an upper wall 35c of a cooling water passage forming member 35, and the relief valve 51 is provided in the first opening 35d on a side remote from a tilt axis. The relief valve 51 is provided with a valve seat 68 provided by facing downward on the upper wall 35c and a valve element 69 capable of being seated on the valve seat 68 from below. For this reason, cooling water remaining in an upper part of the relief valve 51 leaks through a clearance of the valve seat 68 and the valve element 69 and is easily discharged. When the outboard motor is tilted upward in the direction of arrow mark T around the tilt axis, the first opening 35d in which the relief valve 51 is provided becomes high so that cooling water is smoothly discharged by passing through the second opening 35e. COPYRIGHT: (C)2005,JPO&NCIPI