US3707955A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Engine apparatus
Assignee: TILLOTSON Ltd (TILLOSTSON") A CORP OF IRELAND
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Filing: 1971-06-01
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Granted: 1973-01-02
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Expires: 1991-06-01
Abstract
Abstract Improved system for supplying fuel and oil to two-cycle internal combustion engines including a simple and reliable fuel-oil injector pump which mixes the fluids in a desired ratio from separate tanks. Means for automatically shutting off fuel flow upon loss of oil are provided. Crankcase scavenging pressure assists oil pumping. The injector pump continuously circulates fuel through the fuel tank to avoid vapor lock. Several arrangements for properly correlating the injector pumping rate with engine air flow are disclosed. An improved injection nozzle utilizing an elastomeric band is disclosed. A system for supplying dual cylinders from the same injector pump is disclosed.
Inventors
- 👤 O Ulbing
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 00:29
CPC Classifications
F; F01; F01M; F01M3/00; F01M3/02; F02; F02B; F02B1/00; F02B1/02; F02B1/04; F02B75/00; F02B75/02; F02B2075/022; F02B2075/025
Claims Analysis
Total Claims: 17
Claim 1
Independent Claim
136 words
A fuel and oil control system for a two-cycle internal combustion engine having an engine piston connected to a crankshaft and arranged to reciprocate within a ported cylInder supplied by a throttle-controllable air duct, comprising, in combination: a fuel supply tank; an oil supply tank; an injector pump having a cyclically reciprocable pump piston connected to be driven in synchronism with said crankshaft, said pump being connected to said fuel supply tank and said oil supply tank and operable to pump metered amounts of fuel and oil in a predetermined ratio upon reciprocation of said pump piston; first means for simultaneously controlling the throttling of said air duct and the volume of fuel and oil pumped by said injector pump; and second means for introducing the fuel pumped by said injector pump into said air duct.
Claim 2
Dependent Claim
136 words
A fuel and oil control system for a two-cycle internal combustion engine having an engine piston connected to a crankshaft and arranged to reciprocate within a ported cylInder supplied by a throttle-controllable air duct, comprising, in combination: a fuel supply tank; an oil supply tank; an injector pump having a cyclically reciprocable pump piston connected to be driven in synchronism with said crankshaft, said pump being connected to said fuel supply tank and said oil supply tank and operable to pump metered amounts of fuel and oil in a predetermined ratio upon reciprocation of said pump piston; first means for simultaneously controlling the throttling of said air duct and the volume of fuel and oil pumped by said injector pump; and second means for introducing the fuel pumped by said injector pump into said air duct.
Claim 3
Dependent Claim
45 words
A system according to claim 1 in which said engine is provided with one or more lubrication points and in which said system includes one or more passageways arranged to distribute the oil pumped by said injector pump to said one or more lubrication points.
Claim 4
Dependent Claim
47 words
A system according to claim 1 in which said system includes third means connected to receive and combine said metered amounts of fuel and oil pumped by said injector pump, and in which said second means is connected to receive a fuel-oil mixture from said third means.
Claim 5
Dependent Claim
30 words
A system according to claim 1 in which said first means comprises a mechanical linkage connected to the throttle control of said air duct and operable to adjust said pump.
Claim 6
Dependent Claim
28 words
A system according to claim 1 in which said first means comprises means responsive to the scavenging pressure in the crankcase of said engine for adjusting said pump.
Claim 7
Dependent Claim
25 words
A system according to claim 1 having valve means for applying the pressure in the crankcase of said engine to pressurize said oil supply tank.
Claim 8
Dependent Claim
71 words
A system according to claim 1 in which said injector pump comprises first and second piston-cylinder assemblies connected to be reciprocated in synchronism with each other, said first piston-cylinder assembly being connected to receive fuel from said fuel supply tank and operable to dispense said metered amount of fuel, said second piston-cylinder assembly connected to receive oil from said oil supply tank and operable to dispense said metered amount of oil.
Claim 9
Dependent Claim
93 words
A system according to claim 1 wherein said injector pump comprises first and second cyclically reciprocating piston-cylinder assemblies each having an inlet port, an outlet port and a fluid passageway movable between successive porting positions wherein the fluid passageway communicates solely with the inlet port, simultaneously with the inlet port and the outlet port, and solely with the outlet port, the inlet and outlet ports and the movable fluid passageway in both of said piston-cylinder assemblies being relatively spaced to reach successive ones of said successive porting positions simultaneously during a reciprocation cycle.
Claim 10
Dependent Claim
71 words
A system according to claim 1 in which said pump includes a reciprocating tappet arranged to reciprocate said pump piston, said crankshaft includes a circular cam eccentrically-mounted on said crankshaft within the crankcase of said engine, and a circular porous metal ring surrounds said circular cam and is rotatable relative thereto, said ring having a partly spherical recess and said tappet having a partly spherical end adapted to engage said recess.
Claim 11
Dependent Claim
29 words
A system according to claim 2 having means operable upon depletion of oil in said oil supply tank for decreasing the amount of fuel pumped by said injector pump.
Claim 12
Dependent Claim
46 words
A system according to claim 7 having valve means responsive to loss of pressure in second piston-cylinder assembly during a portion of the reciprocation cycle of said assemblies for venting said first piston-cylinder assembly to decrease the amount of fuel pumped by said first piston-cylinder assembly.
Claim 13
Dependent Claim
27 words
A system according to claim 7 having a passageway interconnecting the cylinders of said first and second piston-cylinder assemblies and check valve means situated within said passageway.
Claim 14
Dependent Claim
42 words
A system according to claim 8 in which said first piston has an effective area n times as great aS the area of said second piston, whereby the metered amount of fuel pumped is n times the metered amount of oil pumped.
Claim 15
Dependent Claim
38 words
A system according to claim 8 wherein the piston in each of said piston-cylinder assemblies is rotatable relative to its respective cylinder to vary the times during a reciprocation cycle at which said successive porting positions are reached.
Claim 16
Dependent Claim
49 words
A system according to claim 8 in which the inlet ports of said assemblies are respectively connected to said fuel tank and said oil supply tank through respective check valves, and said pump includes a conduit leading from each of said outlet ports and containing a further check valve.
Claim 17
Dependent Claim
22 words
A system according to claim 8 in which one of said piston-cylinder assemblies is mounted within the other of said piston-cylinder assemblies.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-01-02 | 1976-07-03 | 1977-01-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-01-02 | 1980-07-03 | 1981-01-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-01-02 | 1984-07-03 | 1985-01-02 | $7700.00 | Window Closed / Lapsed |