Ventilating arrangement for watercraft
AssigneeYamaha Hatsudoki Kabushiki Kaisha
InventorsToshiyuki Hattori, Fumihiko Ebihara
Life of this patent
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Abstract
A small, personal watercraft having an improved ventilating system that provides not only ventilating air but also a shroud for an instrument of the watercraft. A compact exhaust system is also provided that extends on opposite sides of a tunnel in which the jet propulsion unit which powers the watercraft is positioned. Transfer pipes extend across the tunnel and across the watercraft to transfer the exhaust gases from the exhaust manifold to the watercraft trap device and also for providing traps to preclude water from entering the engine through the exhaust system.
Claims31
A personal watercraft comprised of a hull having an under-hull portion and a deck portion affixed together to define an engine compartment containing an internal combustion engine and at least one accessory therefor, a propulsion device driven by said engine for propelling said watercraft, a rider's area disposed to the rear of said hull and defined at least in major part by said deck portion, a forward part of said deck portion defining a ventilating air inlet, a longitudinally extending cavity formed by said deck portion at least in part above said engine compartment and receiving ventilating air from said ventilating air inlet, an upstanding wall separating said cavity into a forward portion communicating with said ventilating air inlet and a rearward portion, a ventilating inlet air conduit extending generally downwardly from said forward portion of said cavity from a point above the lower end thereof for delivering ventilating air to the engine compartment, a ventilating exhaust air conduit extending upwardly from a rear portion of said engine compartment to said rearward portion of said cavity, and means for communicating said rearward portion with the atmosphere.
A personal watercraft, comprised of a hull having an under-hull portion and a deck portion affixed together to define an engine compartment containing an internal combustion engine and at least one accessory therefor, a propulsion device driven by said engine for propelling said watercraft, a rider's area disposed to the rear of said hull and defined at least in major part by said deck portion, a forward part of said deck portion defining a ventilating air inlet facing in a generally forward direction, a cavity formed by said deck portion at least in part above said engine compartment and receiving ventilating air from said ventilating air inlet, a ventilating inlet air conduit extending generally downwardly from said cavity from a point above the lower end thereof and contiguous to the ventilating air inlet for delivering ventilating air to the engine compartment, a ventilating exhaust air conduit extending upwardly from a rear portion of said engine compartment to the atmosphere, said upper deck portion being covered by an intermediate portion that defines the lower portion of said cavity, an upper cavity-forming portion, and a shroud-forming portion, said upper cavity forming portion having an air inlet opening for communicating said cavity with said shroud portion, said intermediate portion having an opening for communicating said cavity with said ventilating air inlet conduit.
A personal watercraft comprised of a hull having an under-hull portion and a deck portion affixed together to define an engine compartment containing an internal combustion engine, said under-hull portion defining a tunnel at the rear end thereof, a jet propulsion unit contained at least in part in said tunnel and driven by said engine for propelling said watercraft, said engine having an exhaust port disposed on one side of a longitudinal center plane of the watercraft for discharging combustion products therefrom, a combined exhaust manifold, expansion chamber device and first transfer pipe for collecting exhaust gases from said exhaust port and delivering them transversely across said longitudinal plane, a watertrap device disposed on the other side of said longitudinal plane and extending at least in part along said tunnel, said first transfer pipe discharging the exhaust gases into said watertrap device, and a second transfer pipe extending from said watertrap device upwardly and transversely across said longitudinal center plane for discharging exhaust gases to the atmosphere.
A personal watercraft comprised of a hull having an under-hull portion and a deck portion affixed together to define an engine compartment containing an internal combustion engine and at least one accessory therefor, a propulsion device driven by said engine for propelling said watercraft, a rider's area disposed to the rear of said hull and defined at least in major part by said deck portion, a forward part of said deck portion defining a ventilating air inlet facing in a generally forward direction and forwardly of said rider's area, a cavity formed by said deck portion at least in part above said engine compartment and receiving ventilating air from said ventilating air inlet, a ventilating inlet air conduit extending generally downwardly from said cavity from a point above the lower end thereof and contiguous to the ventilating air inlet for delivering ventilating air to the engine compartment, a ventilating exhaust air conduit extending upwardly from a rear portion of said engine compartment to the atmosphere, said ventilating air inlet being formed by a portion of the hull that defines a generally open discharge path extending from said ventilating air inlet and which overlies an upper portion of said cavity and further including an opening in the wall for delivering air from said discharge path to said cavity, and an instrument for providing information regarding the watercraft operation to an operator and disposed contiguous to the discharge end of the open discharge path.
A personal watercraft comprised of a hull having an under-hull portion and a deck portion affixed together to define an engine compartment containing an internal combustion engine and at least one accessory therefor, a propulsion device driven by said engine for propelling said watercraft, a rider's area disposed to the rear of said hull and defined at least in major part by said deck portion, a forward part of said deck portion defining a ventilating air inlet facing in a generally forward direction, a cavity formed by said deck portion at least in part above said engine compartment and receiving ventilating air from said ventilating air inlet, a pair of ventilating inlet air conduits extending generally downwardly from said cavity from a point above the lower end thereof and contiguous to the ventilating air inlet for delivering ventilating air to the engine compartment, wherein each of said ventilating air conduits opening into said cavity on opposite sides of a longitudinally extending plane of the watercraft and terminating on the other side thereof so that said ventilating inlet air conduits cross over each other, and a ventilating exhaust air conduit extending upwardly from a rear portion of said engine compartment to the atmosphere.
Dependencies are inferred from the claim text.