US4333425A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Fuel system for a two-cycle engine
Assignee: Brunswick Corp
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Filing: 1980-12-29
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Granted: 1982-06-08
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Expires: 2000-12-29
Abstract
Abstract A two-cycle engine (10) has an idle fuel system which admits fuel-air mixture into the transfer passages (22). Heated air is supplied to the idle mixing passage (42) by a serpentine air passage (45), while fuel from the carburetor float bowl (33) is supplied through a needle valve (50). A reed valve (43) admits the idle mixture to the transfer passage (22).
Inventors
- 👤 David W. Kusche
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 13:43
CPC Classifications
F; F02; F02M; F02M3/00; F02M3/08; F02M3/09; F02M3/12; F02B; F02B75/00; F02B75/02; F02B2075/022; F02B2075/025
Claims Analysis
Total Claims: 13
Claim 1
Independent Claim
95 words
A fuel system for a two-cycle, crankcase compression engine having a cylinder block, a cylinder, a piston reciprocable in said cylinder, a crankcase, a transfer passage for transferring air-fuel mixture from said crankcase to said cylinder and an exhaust port for removing combustion gases from said cylinder, said fuel system comprising: (A) a main inlet passage for supplying an air-fuel mixture to said crankcase; (B) a main valve for shutting off said main inlet passage at idle speeds; and (C) an idle inlet passage for supplying an idle air-fuel mixture directly to said transfer passage.
Claim 2
Dependent Claim
95 words
A fuel system for a two-cycle, crankcase compression engine having a cylinder block, a cylinder, a piston reciprocable in said cylinder, a crankcase, a transfer passage for transferring air-fuel mixture from said crankcase to said cylinder and an exhaust port for removing combustion gases from said cylinder, said fuel system comprising: (A) a main inlet passage for supplying an air-fuel mixture to said crankcase; (B) a main valve for shutting off said main inlet passage at idle speeds; and (C) an idle inlet passage for supplying an idle air-fuel mixture directly to said transfer passage.
Claim 3
Dependent Claim
27 words
The fuel system defined in claim 1 wherein said idle inlet passage includes a one way valve to admit said idle air-fuel mixture to said transfer passage.
Claim 4
Dependent Claim
98 words
A fuel system for a two-cycle, crankcase compression engine having a cylinder block, a cylinder, a piston reciprocable in said cylinder, a crankcase, and a transfer passage for transferring air-fuel mixture from said crankcase to said cylinder, said fuel system comprising: (A) a main inlet passage for supplying an air-fuel mixture to said crankcase; (B) a main valve for closing said main inlet passage at idle speeds; (C) an idle inlet passage for supplying a heated idle air-fuel mixture directly to said transfer passage; and (D) a one way valve for admitting said idle mixture to said crankcase.
Claim 5
Dependent Claim
98 words
A fuel system for a two-cycle, crankcase compression engine having a cylinder block, a cylinder, a piston reciprocable in said cylinder, a crankcase, and a transfer passage for transferring air-fuel mixture from said crankcase to said cylinder, said fuel system comprising: (A) a main inlet passage for supplying an air-fuel mixture to said crankcase; (B) a main valve for closing said main inlet passage at idle speeds; (C) an idle inlet passage for supplying a heated idle air-fuel mixture directly to said transfer passage; and (D) a one way valve for admitting said idle mixture to said crankcase.
Claim 6
Dependent Claim
142 words
A fuel system for a two-cycle, crankcase compression engine having a cylinder block, a cylinder, a piston reciprocable in said cylinder, a crankcase, a transfer passage for transferring air-fuel mixture from said crankcase to said cylinder, and an exhaust port for removing combustion gases from said cylinder, and an exhaust port for removing combustion gases from said cylinder, said fuel system comprising: (A) a carburetor mounted on said crankcase, said carburetor including: (1) a fuel reservoir, (2) a main inlet passage for mixing air with fuel from said reservoir and supplying the main air-fuel mixture to said crankcase, and (3) a main valve for shutting off said main inlet passage at idle speeds; and (B) an idle inlet passage for mixing heated air with fuel from said reservoir and supplying the resulting heated air-fuel mixture to said crankcase for engine idling operation.
Claim 7
Dependent Claim
142 words
A fuel system for a two-cycle, crankcase compression engine having a cylinder block, a cylinder, a piston reciprocable in said cylinder, a crankcase, a transfer passage for transferring air-fuel mixture from said crankcase to said cylinder, and an exhaust port for removing combustion gases from said cylinder, and an exhaust port for removing combustion gases from said cylinder, said fuel system comprising: (A) a carburetor mounted on said crankcase, said carburetor including: (1) a fuel reservoir, (2) a main inlet passage for mixing air with fuel from said reservoir and supplying the main air-fuel mixture to said crankcase, and (3) a main valve for shutting off said main inlet passage at idle speeds; and (B) an idle inlet passage for mixing heated air with fuel from said reservoir and supplying the resulting heated air-fuel mixture to said crankcase for engine idling operation.
Claim 8
Dependent Claim
28 words
The fuel system defined in claim 4 wherein said engine includes a main reed valve for supplying the air-fuel mixture from said main inlet passage to said crankcase.
Claim 9
Dependent Claim
24 words
The fuel system defined in claim 5 wherein said engine includes an idle reed valve for supplying said heated air-fuel mixture to said crankcase.
Claim 10
Dependent Claim
35 words
The fuel system defined in claim 2, 3, or 6 wherein said idle inlet passage includes an air passage and a fuel passage to supply fuel for mixing with the air in said air passage.
Claim 11
Dependent Claim
25 words
The fuel system defined in claim 7 wherein said air passage includes a wall heated by said engine whereby said idle air-fuel mixture is heated.
Claim 12
Dependent Claim
30 words
The fuel system defined in claim 8 wherein said heated wall is upstream of said fuel passage whereby the air in said air passage is heated before mixing with fuel.
Claim 13
Dependent Claim
17 words
The fuel system defined in claim 9 wherein said idle inlet passage is adjacent said exhaust port.
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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) | 1985-06-07 | 1985-12-07 | 1986-06-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1989-06-07 | 1989-12-07 | 1990-06-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1993-06-07 | 1993-12-07 | 1994-06-08 | $7700.00 | Window Closed / Lapsed |