Lubricating oil supplying system for two cycle engine
AssigneeYamaha Hatsudoki Kabushiki Kaisha
InventorYoshinobu Yashiro
Life of this patent
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Abstract
A lubricating oil supplying system for a two cycle engine that includes a reciprocating engine drive lubricant pump and a solenoid controlled bypass valve for selectively delivering lubricant to the engine of by bypassing it back to the inlet side of the lubricant pump to control the amount of lubricant supplied to the engine. The duty cycle of solenoid is increased as the engine speed is decreased and the duty cycle is also decreased when the throttle is opened rapidly so as to insure the proper amount of lubricant flow to the engine under all conditions, both transient and steady state.
Claims23
A lubricating system for an internal combustion engine comprising a reciprocating lubricant pump driven by said engine at a fixed speed ratio, said lubricant pump delivering a substantially fixed amount of lubricant during each cycle of its operation, conduit means extending from said lubricant pump to said engine for delivering lubricant thereto, valve means in said conduit means for selectively controlling the flow of lubricant to said engine, said valve means having a flow position in which lubricant flow to said engine is permitted and a non-flow position in which lubricant flow to said engine is precluded, successive flow and non-flow positions comprising a duty cycle "a" with the time of delivery of lubricant during a duty cycle being defined as a time period (a-b) where the time "b" is the time of non-delivery, and means for operating said valve means for varying the time period when said valve means is in its flow position (a-b) and in its non-flow position (b) and also the duty cycle for controlling the amount of lubricant delivered to said engine.
A method of lubricating an internal combustion engine comprising a reciprocating lubricant pump driven at a fixed ratio by the engine, the lubricant pump delivering a substantially fixed amount of lubricant during each cycle of its operation, valve means for selectively controlling the flow of lubricant to the engine, the valve means having a flow position in which lubricant flow to the engine is permitted and a non-flow position in which lubricant flow to said engine is precluded, successive flow and non-flow positions comprising a duty cycle "a" with the time of delivery of lubricant during a duty cycle being defined as a time period (a-b) where the time "b" is the time of non-delivery, the method comprises the steps of operating the valve means for varying the time period when the valve means is in its flow position (a-b) and in its non-flow position (b) and also the duty cycle for controlling the amount of lubricant delivered to the engine.
Dependencies are inferred from the claim text.