STRATIFIED TWO-STROKE ENGINE AND DUAL PASSAGE FUEL SYSTEM

• US 20120247435A1
• Filed: 03/21/2012
• Published: 10/04/2012
• Est. Priority Date: 04/03/2011
• Status: Active Grant

• Current Assignee: Nagesh S. Mavinahally
• Original Assignee: Nagesh S. Mavinahally
• Inventors: Mavinahally, Nagesh S., Veerathappa, Jay S.
• Granted Patent: US 8,783,232 B2
• Time in Patent Office: Days
• US Class Current: 123/527
• CPC Class Codes: F02M 13/08 Carburettors adapted to use liquid and gaseous fuels, e.g. alternatively
• CPC Class Codes: F02M 17/04 having fuel inlet valve controlled by diaphragm
• CPC Class Codes: F02M 21/042 Mixer comprising a plurality of bores or flow passages
• CPC Class Codes: F02M 7/225 The fuel orifice opening is controlled by a manually actuatable throttle valve so as to vary the cross-sectional area of the orifice
• CPC Class Codes: Y02T 10/30 Use of alternative fuels, e.g. biofuels

Abstract

Various embodiments include two-stroke stratified engines and dual passage carburetors for use with gaseous fuel, such as hydrogen, methane, liquid petroleum gas, pure propane, and butane. A stratified air-head engine and low pressure fuel injected engines with fuel only tube is included.

Claims

1. A gaseous fueled dual passage carburetor comprising:

a main throttle body (401)(479);

a secondary throttle body (8901);

a lean passage 9300;

a lean valve 81;

a rich charge passage 8310b;

a rich valve 994b;

at least one pressure regulating chamber with a diaphragm, spring, and needle valve;

at least one fuel metering chamber (317) with a diaphragm, spring, and needle valve;

a first fuel passage 320 leading into the lean passage 9300;

a second fuel passage 220b leading into the rich charge passage 8310b;

at least one fuel tube (220c) connecting the at least one fuel meter chamber (317) to at least one fuel orifice (411b) in the secondary throttle body (8901);

a fuel inlet (620) receiving fuel from at least one fuel tank (850);

a venture (9300);

a first fuel orifice (8410) in the venture (9300); and

a second fuel orifice in the rich charge passage (8310b).

2. The carburetor of claim 1 in which the fuel is substantially free of any oil.

3. The carburetor of claim 1 in which the fuel is a gaseous fuel including one of:

(a) LPG;

(b) Butane; and

(c) Natural gas.

8. An engine comprising:

a crank web 21;

a crankshaft 22 having rotary shut off valve 44 on crank web 21;

a crankcase;

a crankcase chamber 26;

at least one LPG or Butane fuel tank attached to the crankcase;

an oil tank 140 shaped such as to access oil at all engine attitudes, the oil tank separate from the crankcase;

an injection tube 38;

an injection port 40;

a crankcase port 41 at the bottom of injection tube 38 opening into the crankcase chamber 26, in which crankcase port 41 is opened and closed by annular slots 44 and 45 on the crank web 21; and

the carburetor of claim 1 embedded within the engine.

4. A gaseous fueled dual passage carburetor comprising:

a main throttle body (401)(479);

a secondary throttle body (8901);

at least one fuel orifice (411b) in the secondary throttle body (8901);

an air only passage 8310 in the main throttle body (401)(479);

an air only valve 81b;

a rich charge passage 8300;

a rich valve 994b;

at least one pressure regulating chamber with a diaphragm, spring, and a needle valve;

a fuel metering chamber (317);

at least one fuel passage (220b) connecting fuel metering chamber (317) to the at least one fuel orifice (411b) in the secondary throttle body (8901);

a fuel adjusting screw (407) in the fuel passage 220b;

at least one fuel tank (850);

a fuel inlet (620) receiving gaseous fuel from the at least one fuel tank (850); and

at least one fuel orifice in the rich charge passage (8300).

5. The carburetor of claim 4 in which the fuel is substantially free of any oil.

6. The carburetor of claim 4 in which the fuel is a gaseous fuel including one of:

(a) LPG;

(b) Butane; and

(c) Natural gas.

9. A gaseous fueled stratified engine including:

a housing;

a crankshaft 22;

at least one LPG or Butane fuel tank within the engine housing;

an oil tank 140;

an intake port 84;

at least one air pipe 88 with at least one one-way valve 89 at the end of the air pipe 88;

the carburetor of claim 4 embedded within the engine, said carburetor further comprising;

at least one pressure regulating chamber;

at least one fuel metering chamber; and

a gaseous fuel inlet 620;

a passage 8300;

an oil injector 702 for injecting oil into the passage 8300;

an oil injection pump 138 driven by the crankshaft 22; and

at least one transfer passage 11 having at least one transfer port 33, in which the at least one transfer passage 11 is intermittently connected to ambient air through the at least one air pipe 88 and through the at least one one-way valve 89,

in which the at least one air pipe 88 connects the carburetor to the top of transfer passage 11.

10. A gaseous fueled stratified engine including:

a housing;

a crankshaft 22;

at least one LPG or Butane fuel tank within the engine housing;

an oil tank 140;

an intake port 84;

at least one air pipe 88 with at least one one-way valve 89 at the end of the air pipe 88;

the carburetor of claim 4 embedded within the engine, said carburetor delivering an air-fuel with oil mist for lubricating the engine; and

at least one transfer passage 11 having at least one transfer port 33,

in which the at least one transfer passage 11 is intermittently connected to ambient air through the at least one air pipe 88 and through the at least one one-way valve 89, and

in which the at least one air pipe 88 connects the carburetor 9000 to the top of transfer passage 11.

11. A gaseous fueled carburetor as claimed in claim 4 further having:

a carburetor 8400 (7000) (8900) delivering either a gaseous fuel or liquid fuel;

a fuel throttle body 479;

air throttle body 8902; and

throttle valves 81 and 994b, the two throttle valves connected to one another through a link,

in which fuel throttle body 479 and air throttle body 8902 are two separate bodies and are attached through a plate 9408b.

19. A gaseous fueled stratified engine including:

a housing;

a crankshaft 22;

at least one LPG or Butane fuel tank within the engine housing;

an intake port 84;

at least one air pipe 88 with at least one one-way valve 89 at the end of the air pipe 88, and

the carburetor of claim 4 embedded within the engine, said engine further comprising;

at least one transfer passage 11 having at least one transfer port 33,

in which the at least one transfer passage 11 is intermittently connected to ambient air through the at least one air pipe 88 and through the at least one one-way valve 89,

in which the at least one air pipe 88 connects the carburetor 9000 to the top of transfer passage 11.

20. The engine of claim 19, in which the carburetor further comprises:

at least one pressure regulating chamber 517, having a needle valve 513 and a diaphragm 514;

a metering chamber 317 with a needle valve 313 and a diaphragm 314;

an air only passage 404 and air only throttle valve 94;

a rich air-fuel passage 405, having a throttle valve 81; and

a lean air-fuel passage 406 having a throttle valve 80.

21. The engine of claim 20 in which valves 94, 81, and 80 are rotary valves.

22. The engine of claim 20 in which valves 94, 81, and 80 are butterfly valves.

23. The engine of claim 20 in which valves 94, 81, and 80 are a combination of rotary and butterfly valves.

7. An engine comprising:

a crank web 21;

a crankshaft 22 having rotary shut off valve 44 on crank web 21;

an injection tube 38;

an injection port 40;

a crankcase or main body 28;

a crankcase chamber 26;

a crankcase port 41 at the bottom of injection tube 38 opening into the crankcase chamber 26, in which crankcase port 41 is opened and closed by annular slots 44 and 45 on the crank web 21;

an engine housing;

at least one LPG or Butane fuel tank attached to the engine (or housing);

an oil tank 140 shaped such as to access oil at all engine attitudes;

a passage 310;

an oil injector 702 for injecting oil into the passage 310;

an oil injection pump 138 driven by the crankshaft 22; and

a gaseous fuel carburetor, in which the carburetor comprises;

at least one pressure regulating chamber;

at least one fuel metering chamber; and

a gaseous fuel inlet 620.

16. The engine of claim 7 further comprising:

a combustion chamber 26;

two transfer passages 11 connecting the crankcase chamber to the combustion chamber;

a U-shaped pipe with a first port at the base of the U for receiving gas from the carburetor, and second and third ports at the respective tips of the U, said second and third ports for delivering gas to the respective transfer passages 11.

12. A dual passage (gaseous or liquid) carburetor (8990) (8900) having a detachable air throttle body 801c having dual air-only outlets (8310c and 8310d), in which the carburetor can be connected to an engine with transfer passages, and supply air to the transfer passages via the dual air-only outlets.

13. An internal combustion engine comprising:

a cylinder (12);

a cylinder bore (14);

a crankshaft (22);

a piston (16) connected to the crankshaft (22) having a counter weight (21);

a crankcase chamber (26);

a combustion chamber (30);

at least one injection port (40) intermittently open to the combustion chamber (30);

an injection tube (38) intermittently filled with gaseous fuel, and intermittently connected to the crankcase chamber (26);

at least one intake port (84); and

at least one exhaust port (50),

in which the engine is mist lubricated through the intake port 84.

14. The engine of claim 13 further having at least one cylindrical fuel tank.

15. The engine of claim 13 in which oil enters the crankcase chamber with an air-fuel mixture.

17. An internal combustion engine comprising:

a cylinder (12);

a cylinder bore (14);

a crankshaft (22);

a piston (16) connected to the crankshaft (22) having a counter weight (21);

a crankcase chamber (26);

a combustion chamber (30);

at least one injection port (40) intermittently open to the combustion chamber (30);

an injection tube (38) intermittently filled with gaseous fuel, and intermittently connected to the crankcase chamber (26);

at least one intake port (84); and

at least one exhaust port (50),

in which the gaseous fuel is LPG or Butane.

18. An internal combustion engine comprising:

a cylinder (2012) and a cylinder bore (14);

a crankshaft (22) having a counter weight (21);

a piston (2016) connected to the crankshaft (22),

in which the piston (2016) has at least one air channel (96) on the piston skirt (2113);

at least one air inlet port (98);

at least one transfer port (33);

at least one first port (99) and at least one second port (101), in which the first and second ports intermittently align with the at least one air inlet port (98) and the at least one transfer port (33), respectively;

a crankcase chamber (26);

a combustion chamber (30);

at least one injection port (40) intermittently open to the combustion chamber (30);

a injection tube (38), the injection tube (38) intermittently filled with gaseous fuel and intermittently connected to the crankcase chamber (26);

at least one first piston port (99);

at least one second port (101); and

at least one exhaust port (50).

24. A carburetor 7600 comprising:

a body 401b;

at least one pressure chamber 517 (and 417);

a metering chamber 317;

a detached throttle valve body 8902b;

a fuel passage 220 connecting the metering chamber 317 to at least one fuel orifice 411b in the detached throttle valve body 8902b;

an adjustable screw 407 with a fuel passage 220c between tapered seat 407b and the fuel orifice 411b;

a throttle valve 881c to regulate air-fuel mixture;

a throttle lever 9408; and

at least two mounting holes 402b.

25. A carburetor 7000 as claimed in claim 24 having an air valve 423 in the carburetor body 401b (401) and linked to the throttle valve 881c. (Shown in FIG. 16)

26. A carburetor 7700 as claimed in claimed in claim 24 having the air throttle valve 94 and the throttle valve 881c in a detached throttle body 8902b detached from the carburetor body 401. (Shown in FIG. 18)