Lubricating System for a Two-Stroke Engine

Abstract

A lubricating system for a two-stroke engine is provided in which oil is more reliably pumped into the two-stroke engine. The oil travels through passages that are integrally cast into the cylinder and/or crankcase. The oil may be injected directly into the crankcase chamber or intake passage. The oil pump may be a rotary pump mounted on the crankcase concentric to the crankshaft. It is also possible to not use an oil pump, and have the oil drawn into the engine by vacuum created in the crankcase.

1 . (canceled) 
     
     
         2 . A lubricating system for a two stroke engine comprising:
 an oil pump mounted to the side of the crankcase of said two stroke engine;   an oil reservoir and oil supply passage from said oil reservoir to said oil pump, and   an oil outlet passage of said oil pump for the injection of oil from said oil pump into said crankcase, wherein said oil outlet passage is cast integrally into the crankcase.   
     
     
         3 . The lubricating system of  claim 2  further comprising an oil pump drive gear of said oil pump located concentrically on the crankshaft. 
     
     
         4 . The lubricating system of  claim 2  wherein said oil outlet passage of said oil pump injects oil into a crankcase chamber of said crankcase. 
     
     
         5 . The lubricating system of  claim 4  wherein said oil outlet passage of said oil pump is directly in line with a crankcase chamber inlet passage of said crankcase chamber. 
     
     
         6 . The lubricating system of  claim 4  further comprising a check valve for allowing one way flow of oil from said oil pump into said crankcase chamber. 
     
     
         7 . The lubricating system of  claim 2  wherein said oil outlet passage of said oil pump injects oil into an air/fuel intake port of said crankcase through an internally cast oil passage. 
     
     
         8 . The lubricating system of  claim 2  wherein said oil passage from said oil reservoir to said oil pump is cast integrally into said crankcase. 
     
     
         9 . The lubricating system of  claim 2  wherein said oil reservoir is shaped in a spherical to semi-spherical fashion with an oil supply line, that has an oil filter at the end, is inside said oil reservoir and said oil supply line is free to rotate, whereby said oil filter is kept immersed in the oil at all attitudes. 
     
     
         10 . A lubricating system for a two stroke engine comprising:
 a rotary oil pump concentrically mounted on a crankshaft of said engine;   an oil reservoir;   an oil supply passage from said oil reservoir to said rotary oil pump; and   an outlet passage from said oil pump to feed oil directly into a crankcase chamber of said crankcase.   
     
     
         11 . The lubricating system of  claim 10  further comprising of a check valve integrated into said oil supply passage. 
     
     
         12 . The lubricating system of  claim 10  further comprising of a check valve integrated into said outlet passage from said oil pump to said crankcase chamber. 
     
     
         13 . The lubricating system of  claim 10  wherein said rotary oil pump is a gerotor type pump. 
     
     
         14 . The lubricating system of  claim 10  wherein said oil reservoir is shaped in a spherical to semi-spherical fashion with an oil supply line, that has an oil filter at the end, is inside said oil reservoir and said oil supply line is free to rotate, whereby said oil filter is kept immersed in the oil at all attitudes. 
     
     
         15 . A lubricating system for a two stroke engine comprising:
 an oil reservoir;   an oil supply passage from said oil reservoir to a crankshaft of said engine, wherein said oil supply passage is cast integrally into a crankcase of said engine and said oil supply passage terminates at a oil supply passage ending orifice; and   a crankshaft passage within said crankcase, beginning at a crankshaft passage beginning orifice and terminating into a crankcase chamber of said crankcase, wherein said oil supply passage ending orifice connects to crankshaft passage beginning orifice at preselected degrees of crankshaft rotation such that the flow of oil from said oil reservoir into said crankcase chamber occurs through the presence of a vacuum in said crankcase chamber.   
     
     
         16 . The lubricating system of  claim 15  further comprising of a check valve at the exit of said crankshaft passage to close said crankshaft passage when said engine is not operating. 
     
     
         17 . The lubricating system of  claim 16  wherein said check valve is comprised of a checkball, a spring, and a hollow retaining plug, such that when said engine is operating and said crankshaft is spinning, centrifugal force causes the ball to retract from its seat in said crankshaft passage, unobstructing the flow of oil into said engine. 
     
     
         18 . The lubricating system of  claim 15  wherein said oil reservoir is shaped in a spherical to semi-spherical fashion with an oil supply line, that has an oil filter at the end, is inside said oil reservoir and said oil supply line is free to rotate, whereby said oil filter is kept immersed in the oil at all attitudes.