Intake heating system for outboard engine
AssigneesYamaha Hatsudoki Kabushiki Kaisha, Shanshin Kogyo Kabushiki Kaisha
InventorTomio Iwai
Life of this patent
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Abstract
A combined cooling and heating system for an internal combustion engine. The system includes a cooling jacket that cools the cylinder block and which discharges through a thermostatically controlled valve into a coolant sump having upper and lower outlets. The lower outlet discharges into a heating jacket for the induction system so as to provide induction system heating that is relatively independent of the engine speed. The upper sump outlet discharges into the cylinder head cooling jacket.
Claims15
A heating system for the induction system of an internal combustion engine comprising an induction system heating jacket in heat exchange relationship to a portion of said induction system, a coolant pump driven by said engine for pressurizing and circulating from a coolant source, a coolant jacket in heat exchanging relationship with a portion of the engine, conduit means for delivering the coolant pressurized by said coolant pump to said coolant jacket, a first return for returning coolant from said coolant jacket to the coolant source, said first return being substantially unrestricted under all running conditions, and means including a second return for delivering the heated coolant from said coolant jacket to said heating jacket, said second return including means for restricting the flow through said heating jacket to a rate independent of the pressure exerted on the coolant by said pump.
A liquid cooling system for an internal combustion engine comprising a first coolant jacket portion in heat exchanging relation with a first portion of said engine, a second coolant jacket portion in heat exchanging relationship to a second portion of said engine, each of said coolant jacket portions having a respective inlet and outlet, a sump, a thermostatically controlled conduit interconnecting said first coolant jacket portion outlet with said sump for delivering heated coolant to said sump, a lower coolant outlet in said sump, an upper coolant outlet in said sump located at a higher elevation than said lower sump coolant outlet, and conduit means connecting said lower sump coolant outlet with said second coolant jacket portion inlet for delivering coolant from said sump to said second coolant jacket portion.
A heating system for the induction system of an internal combustion engine comprising an induction system heating jacket in heat exchange relationship to a portion of said induction system, a coolant pump for circulating coolant, a coolant jacket in heat exchanging relationship with a portion of the engine, conduit means for delivering the coolant by said coolant pump to said coolant jacket, a sump adapted to contain a predetermined amount of coolant, heating conduit means for communicating said sump with said heating jacket for delivering coolant from said sump to said heating jacket means, restriction means providing a constant restriction to the flow of coolant through said heating conduit means, and means for delivering the heated coolant from said coolant jacket to said sump, said restriction means restricting the flow from said sump to said heating jacket to an amount less than that circulated by said coolant pump at low speed of the engine for accumulating heated coolant in said sump at low engine speed.
Dependencies are inferred from the claim text.