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US 4,395,991 AGranted
Emission preventing system of evaporated fuel for internal combustion engine
AssigneeYamaha Hatsudoki Kabushiki Kaisha
InventorsSumio Miyachi, Jun Taue
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Abstract
An internal combustion engine in which a fuel evaporated in a fuel tank is stored in a crankcase, including a system for preventing the evaporated fuel from being emitted into the atmosphere. The crankcase is in communication with an intake passage through a breather passage and with the atmosphere through an atmospheric vent. Change-over means provides communication between the crankcase and the intake passage while the engine is running, and vents the crankcase to the atmosphere when the engine is stopped.
Claims10
An emmission prevention system for evaporated fuel in an internal combustion engine comprising;
- a fuel tank;
- overflow passage means connecting a fuel storage tank to said internal combustion engine crankcase;
- vent passage means for connecting said crankcase to the atmosphere;
- breather passage means for connecting said crankcase to the induction intake passages of said internal combustion engine;
- flow control means comprising a three way valve having an inlet port and two selectible outlet ports, both of said passage means incorporating said inlet port, and each being respective to one of said outlet ports, said valve being selectible to connect said crankcase to said induction intake passages through said breather passage means when said engine is operating, and to atmosphere through said vent passage means when said engine is stopped, whereby evaporated fuel overflow is stored in said crankcase and excess is vented to atmosphere when the engine is stopped and is delivered to the combustion chambers of said engine for burning when said engine is running.
2 more elements
Dependencies are inferred from the claim text.