Patent US5237966A successfully refreshed from Google Patents.
US5237966A
Expired / Lapsed
US
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Fuel injection system for the two cycle engine
Assignee: Yamaha Marine Co Ltd
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Filing: 1992-02-28
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Granted: 1993-08-24
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Expires: 2012-02-28
Abstract
Abstract Several embodiments of fuel injection systems for two cycle internal combustion engines wherein fuel is injected into a conduit for delivery into the combustion chamber through a port in the cylinder liner. A nozzle insert is positioned in the conduit and has a restricted opening that forms the discharge through which fuel and gas under pressure are supplied to the combustion chamber for facilitating servicing and replacement.
Inventors
- 👤 Masahiko Katoh
- 👤 Masanori Takahashi
- 👤 Seiji Inoue
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 15:21
CPC Classifications
F; F02; F02M; F02M69/00; F02M69/46; F02M69/54; F02B; F02B33/00; F02B33/32; F02B33/34; F02B33/36; F02B33/38; F02M61/00; F02M61/14; F02M67/00; F02M67/02; F02M67/10; F02M69/04; F02M69/042; F02M69/045; F02B1/00; F02B1/02; F02B1/04; F02B75/00; F02B75/02; F02B2075/022; F02B2075/025; F02B75/12; F02B2075/125; F02B61/00; F02B61/04; F02B61/045; Y; Y02; Y02T; Y02T10/00; Y02T10/10; Y02T10/12
Claims Analysis
Total Claims: 27
Claim 1
Independent Claim
155 words
A fuel injection system for an internal combustion engine having a variable volume combustion chamber defined by a pair of relatively moveable components, a nozzle port extending through one of said components and opened and closed only by the relative movement of said components, a conduit extending to said nozzle port from externally of said combustion chamber and formed at least in part by one of said components, a nozzle insert inserted into said conduit and having an inlet opening of cross section substantially the same as said conduit and an unvalved outlet opening juxtaposed to said nozzle port and having a substantially smaller effective flow area than said nozzle port, a chamber formed between said inlet opening and said outlet opening, means for delivering a pressurized gas to said chamber, at least during a portion of the time when said nozzle port is open, and a fuel injector for injecting fuel into said chamber.
Claim 2
Dependent Claim
155 words
A fuel injection system for an internal combustion engine having a variable volume combustion chamber defined by a pair of relatively moveable components, a nozzle port extending through one of said components and opened and closed only by the relative movement of said components, a conduit extending to said nozzle port from externally of said combustion chamber and formed at least in part by one of said components, a nozzle insert inserted into said conduit and having an inlet opening of cross section substantially the same as said conduit and an unvalved outlet opening juxtaposed to said nozzle port and having a substantially smaller effective flow area than said nozzle port, a chamber formed between said inlet opening and said outlet opening, means for delivering a pressurized gas to said chamber, at least during a portion of the time when said nozzle port is open, and a fuel injector for injecting fuel into said chamber.
Claim 3
Dependent Claim
39 words
A fuel injection system as set forth in claim 1 wherein the conduit opens through the outer periphery of the component in which it is formed for removal and insertion of the nozzle insert from externally of the component.
Claim 4
Dependent Claim
34 words
A fuel injection system as set forth in claim 2 wherein the nozzle insert at least partially closes the opening of the conduit through the component of the engine in which it is formed.
Claim 5
Dependent Claim
25 words
A fuel injection system as set forth in claim 3 wherein the fuel injector injects fuel directly into the inlet opening of the nozzle insert.
Claim 6
Dependent Claim
23 words
A fuel injection system as set forth in claim 4 wherein the nozzle insert is formed as a unit with the fuel injector.
Claim 7
Dependent Claim
23 words
A fuel injection system as set forth in claim 4 wherein the nozzle insert inlet opening is formed to receive the fuel injector.
Claim 8
Dependent Claim
21 words
A fuel injection system as set forth in claim 3 wherein the nozzle insert forms a complete closure for the opening.
Claim 9
Dependent Claim
24 words
A fuel injection system as set forth in claim 7 wherein the inlet opening of the nozzle insert extends generally perpendicularly to the conduit.
Claim 10
Dependent Claim
30 words
A fuel injection system as set forth in claim 8 wherein the fuel and pressurized gas are both mixed externally of the chamber and prior to delivery to the chamber.
Claim 11
Dependent Claim
29 words
A fuel injection system as set forth in claim 1 wherein the pressurized gas is delivered to the chamber in a direction to induce a swirl in the chamber.
Claim 12
Dependent Claim
39 words
A fuel injection system as set forth in claim 1 wherein the engine is a reciprocating engine and one of the components comprises a piston and the other of the components comprises a cylinder block and cylinder head assembly.
Claim 13
Dependent Claim
26 words
A fuel injection system as set forth in claim 11 wherein the nozzle port is formed by an opening in the wall of the cylinder block.
Claim 14
Dependent Claim
40 words
A fuel injection system as set forth in claim 12 wherein the conduit is open through the outer periphery of the cylinder block and cylinder head assembly for removal and insertion of the nozzle insert from externally of the assembly.
Claim 15
Dependent Claim
31 words
A fuel injection system as set forth in claim 13 wherein the nozzle insert at least partially closes the opening of the conduit through the cylinder head and cylinder block assembly.
Claim 16
Dependent Claim
25 words
A fuel injection system as set forth in claim 14 wherein the fuel injector injects fuel directly into the inlet opening of the nozzle insert.
Claim 17
Dependent Claim
23 words
A fuel injection system as set forth in claim 15 wherein the nozzle insert is formed as a unit with the fuel injector.
Claim 18
Dependent Claim
23 words
A fuel injection system as set forth in claim 15 wherein the nozzle insert inlet opening is formed to receive the fuel injector.
Claim 19
Dependent Claim
21 words
A fuel injection system as set forth in claim 14 wherein the nozzle insert forms a complete closure for the opening.
Claim 20
Dependent Claim
24 words
A fuel injection system as set forth in claim 18 wherein the inlet opening of the nozzle insert extends generally perpendicularly to the conduit.
Claim 21
Dependent Claim
30 words
A fuel injection system as set forth in claim 19 wherein the fuel and pressurized gas are both mixed externally of the chamber and prior to delivery to the chamber.
Claim 22
Dependent Claim
29 words
A fuel injection system as set forth in claim 12 wherein the pressurized gas is delivered to the chamber in a direction to induce a swirl in the chamber.
Claim 23
Dependent Claim
28 words
A fuel injection system as set forth in claim 12 further including means for delivering air for combustion to the combustion chamber other than through the nozzle port.
Claim 24
Dependent Claim
33 words
A fuel injection system as set forth in claim 22 wherein the air for combustion is delivered to the combustion chamber through a scavenge port formed in the cylinder block and head assembly.
Claim 25
Dependent Claim
20 words
A fuel injection system as set forth in claim 23 wherein the nozzle port is formed adjacent the scavenge port.
Claim 26
Dependent Claim
40 words
A fuel injection system as set forth in claim 24 wherein the combustion chamber includes a combustion recess and further including a spark plug positioned in the combustion recess and wherein the nozzle port is directed toward the spark plug.
Claim 27
Dependent Claim
29 words
A fuel injection system as set forth in claim 25 further including an exhaust port in the cylinder block and head assembly and opened and closed by the piston.
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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) | 1996-08-23 | 1997-02-22 | 1997-08-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2000-08-23 | 2001-02-22 | 2001-08-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2004-08-23 | 2005-02-22 | 2005-08-24 | $7700.00 | Window Closed / Lapsed |