US 6,216,660 B1 · Lubricating system in a 4-cycle engine

Abstract

A 4-cycle engine, includes an engine body, having a piston, a crankshaft and a crank chamber, an independent oil reservoir chamber adjacent the crank chamber, the crankshaft extending into the oil reservoir chamber from the crank chamber, an oil mist generator disposed in the independent oil reservoir chamber and being secured to and driven by the crankshaft, and a valve-operating chamber. Further, the engine includes a first passageway connecting the oil reservoir chamber with the crank chamber to provide oil mist communication therebetween, a second passageway connecting the crank chamber with the valve-operating chamber to provide oil mist communication therebetween, and a third passageway connecting the valve-operating chamber with the independent oil reservoir chamber to provide oil communication therebetween, wherein the three chambers and the three passageways form a lubrication oil feed channel to provide one-way circulation of lubrication oil therethrough.

Claims20

Dependent claims

A 4-cycle engine, comprising:

(a) an engine body having a piston, a crankshaft and a crank chamber;
(b) an independent oil reservoir chamber adjacent said crank chamber, said crankshaft extending into said oil reservoir chamber from said crank chamber;
(c) an oil mist generator disposed in said independent oil reservoir chamber and being secured to and driven by said crankshaft;
(d) a valve-operating chamber;
(e) a first passageway connecting said oil reservoir chamber with said crank chamber to provide oil mist communication therebetween;
(f) a second passageway connecting said crank chamber with said valve-operating chamber to provide oil mist communication therebetween;
and
(g) a third passageway connecting said valve-operating chamber with said independent chamber to provide oil communication therebetween, wherein said three chambers and said three passageways form a lubrication oil feed channel to provide one-way circulation of lubrication oil therethrough.

5 more elements

A 4-cycle engine, comprising:

(a) an engine body having a piston, a crankshaft and a crank chamber;
(b) an independent oil reservoir chamber adjacent said crank chamber, said crankshaft extending into said oil reservoir chamber from said crank chamber;
(c) an oil mist generator disposed in said independent oil reservoir chamber and being secured to and driven by said crankshaft;
(d) a valve-operating chamber;
(e) a first passageway connecting said oil reservoir chamber with said crank chamber to provide oil mist communication therebetween;
(f) a second passageway connecting said crank chamber with said valve-operating chamber to provide oil mist communication therebetween, said second passageway having a one-way valve disposed therein to enable oil mist to flow from said crank chamber into said valve-operating chamber;
and
(g) a third return passageway connecting said valve-operating chamber with said independent oil reservoir chamber to provide oil communication therebetween, wherein said three chambers and said three passageways form a lubrication oil feed channel to provide one-way circulation of lubrication oil therethrough by pressure differences in said three chambers, wherein the following expression is established during the downward movement of said piston:
Po<Pv<Pc
wherein Po is pressure in said oil reservoir chamber, Pv is pressure in said valve-operating chamber, and Pc is pressure in said crank chamber;
and further wherein the following expression is also established during upward movement of said piston:
Pc<Po<Pv.

9 more elements

A 4-cycle engine, comprising:

(a) an engine body having a piston, a crankshaft and a crank chamber;
(b) an independent oil reservoir chamber adjacent said crank chamber, said crankshaft extending into said oil reservoir chamber from said crank chamber, wherein an oil slinger is secured to said crankshaft in said oil reservoir chamber and rotatable in accordance with said crankshaft;
(c) a valve-operating chamber;
(d) a through-hole in said crankshaft connecting said oil reservoir chamber with said crank chamber to provide oil mist communication therebetween;
(e) a one-way valve connecting said crank chamber with said valve-operating chamber to provide oil mist communication from said crank chamber to said valve-operating chamber;
and
(f) an oil circulating passage with an orifice connecting said valve-operating chamber with said independent oil reservoir chamber,
wherein the following expression is established during operation of the engine:
Pc≦Po≦Pv
wherein Pc is a pressure in the crank chamber;
Po is a pressure in the oil reservoir chamber;
and Pv is a pressure in the valve operating chamber.

9 more elements

Dependencies are inferred from the claim text.

Lubricating system in a 4-cycle engine

Life of this patent

Lubricating system in a 4-cycle engine

Life of this patent

Abstract

Claims20