US5080079A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Fuel injection apparatus having fuel pressurizing pump
Assignee: Aisin Corp
•
Filing: 1990-09-24
•
Granted: 1992-01-14
•
Expires: 2010-09-24
Abstract
Abstract A fuel injection apparatus has a piezoelectric element for generating a high-pressurized air-fuel gas mixture. The piezoelectric element is arranged at a side of a pumping chamber, and a diaphragm is arranged between the piezoelectric element and the pumping chamber. The piezoelectric element produces a pumping function in accordance with a current signal.
Inventors
- 👤 Yutaka Yoshida
- 👤 Eiji Sakagami
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 08:16
CPC Classifications
F; F02; F02M; F02M69/00; F02M69/10; F02M67/00; F02M67/10; F02M67/12; F02M69/08; F02B; F02B75/00; F02B75/02; F02B2075/022; F02B2075/025
Claims Analysis
Total Claims: 13
Claim 1
Independent Claim
113 words
A fuel injection apparatus for supplying a fuel mixture to a combustion chamber of an engine, comprising: a main body having a fuel path; an injector valve connected to said main body and in communication with said fuel path; a mixing chamber connected to said fuel path for mixing the fuel with air to form a fuel mixture; injector valve drive means connected to said main body to selectively open said injector valve so as to supply the fuel mixture to the combustion chamber at a controlled rate; and a fuel pressurizing pump in communication with said fuel path, whereby the fuel is rapidly gasified and pressurized, said pump including a piezoelectric element.
Claim 2
Dependent Claim
113 words
A fuel injection apparatus for supplying a fuel mixture to a combustion chamber of an engine, comprising: a main body having a fuel path; an injector valve connected to said main body and in communication with said fuel path; a mixing chamber connected to said fuel path for mixing the fuel with air to form a fuel mixture; injector valve drive means connected to said main body to selectively open said injector valve so as to supply the fuel mixture to the combustion chamber at a controlled rate; and a fuel pressurizing pump in communication with said fuel path, whereby the fuel is rapidly gasified and pressurized, said pump including a piezoelectric element.
Claim 3
Dependent Claim
50 words
The fuel injection apparatus of claim 1 wherein said pressurizing pump further comprises: a pumping chamber in said main body and communicating with said fuel path; and means for transferring expansions and contractions of said piezoelectric element to said pumping chamber, so as to pump fuel in said pumping chamber.
Claim 4
Dependent Claim
16 words
The fuel injection apparatus of claim 2 including inlet and outlet valves for said pumping chamber.
Claim 5
Dependent Claim
41 words
The fuel injection apparatus of claim 3 wherein said transferring means comprise: a diaphragm forming a wall of said pumping chamber; and a pumping plate mounted to said-diaphragm and movable in accordance with the expansions and contractions of said piezoelectric element.
Claim 6
Dependent Claim
21 words
The fuel injection apparatus of claim 4 including a pump housing fixed to said main body and enclosing said piezoelectric element.
Claim 7
Dependent Claim
20 words
The fuel injection apparatus of claim 5 wherein said diaphragm is held between said main body and said pump housing.
Claim 8
Dependent Claim
17 words
The fuel injection apparatus of claim 4 wherein said pumping plate is fixed to said piezoelectric element.
Claim 9
Dependent Claim
20 words
The fuel injection apparatus of claim 4 wherein said injector valve drive means comprise a solenoid and a solenoid driver.
Claim 10
Dependent Claim
12 words
The fuel injection apparatus of claim 8 including a piezoelectric element driver.
Claim 11
Dependent Claim
25 words
The fuel injection apparatus of claim 9 including a fuel injection controller comprising means for controlling both said solenoid driver and said piezoelectric element driver.
Claim 12
Dependent Claim
40 words
The fuel injection apparatus of claim 4 wherein said mixing chamber is connected between said pumping chamber and said injector valve, said mixing chamber including an air inlet port for introducing pressurized air to be mixed with the pressurized fuel.
Claim 13
Dependent Claim
27 words
The fuel injection apparatus of claim 5 including an elastic plate mounted between said piezoelectric element and said pump housing at a position opposite said pumping plate.
References Cited (Backward Citations)
US2682866A
Cited
US3186393A
Cited
US4149497A
Cited
US4617904A
Cited
US4774909A
Cited
US4782807A
Cited
US4844339A
Cited
US4943004A
Cited
US4899714A
Cited
US4974571A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1995-01-13 | 1995-07-15 | 1996-01-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1999-01-13 | 1999-07-15 | 2000-01-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2003-01-13 | 2003-07-15 | 2004-01-14 | $7700.00 | Window Closed / Lapsed |