Patent ID: 6752671
Filing Date: 2004-06-22
Classification: B63H,F02B

Abstract:
A water jet propulsion type outboard motor comprising:a power source; a driving system for transmitting a driving power of the power source; a curved tubular duct member fixed to a housing on which the power source is mounted, having a suction port and a discharge port; guide blades provided within the duct member, in a vicinity of the discharge port thereof; an impeller enclosed by the duct member and rotated by the driving system, wherein an outer peripheral edge of a spiral blade of the impeller provided around its hub is close to an inner peripheral face of the duct member, and its outer peripheral distal end portion extends toward the suction port; and a cooling water system for cooling the power source, including a pump for pumping up water from outside, first and second water channel systems for guiding water from outside into the pump, and a third water channel system for guiding water from the pump via the power source to the outside, wherein the first water channel system includes: a water intake port provided on an inner surface of the duct member between the impeller and the discharge port; a straight tubular path with the water intake port on its end, penetrating through the duct member; a first water channel branching from the straight tubular path, for guiding water into the pump; and a strainer provided in the straight tubular path so as to be detachable from outside, and wherein the second water channel system includes: a water intake unit for taking in water from outside; and a second water channel for guiding water from the water intake unit into the pump.