Patent US5143036A successfully refreshed from Google Patents.
US5143036A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Multi-valve internal combustion engine
Assignee: Mazda Motor Corp
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Filing: 1991-03-27
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Granted: 1992-09-01
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Expires: 2011-03-27
Abstract
Abstract A multi-valve internal combustion engine has a plurality of intake valves, and the same number of intake ports as there are intake valves, for each engine cylinder. One of the intake ports forms a helical passage, opening into a center of a combustion chamber of the engine at the location of a spark plug, which is disposed adjacent an intake valve located in the center intake port. In addition to a fuel injector disposed in one of the intake ports, a secondary fuel injector, energized so as to inject fuel when the engine operates at lower loads, is preferably disposed adjacent the intake valve located in the one intake port.
Inventors
- 👤 Toru Shiraishi
- 👤 Shunji Masuda
- 👤 Noriyuki Iwata
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 20:41
CPC Classifications
F; F02; F02B; F02B17/00; F02B31/00; F02B31/08; F02B31/087; F02F; F02F1/00; F02F1/24; F02F1/42; F02F1/4214; F02F1/4221; F02B1/00; F02B1/02; F02B1/04; F02B2275/00; F02B2275/18; F02F2001/244; F02F2001/245; F02F2001/247; Y; Y02; Y02T; Y02T10/00; Y02T10/10; Y02T10/12
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
110 words
A multi-valve internal combustion engine comprising: a plurality of intake valves for one cylinder; an engine body having a cylinder block formed with a cylinder bore, a cylinder head mounted on said cylinder block, and a piston, slidably received in said cylinder bore and, together with said cylinder block, cylinder bore and cylinder head, forming a combustion chamber; and intake ports, in the same number as there are intake valves, formed in said cylinder head and opening into said combustion chamber, one of said intake valves disposed in each of said intake ports, one of said intake ports forming a helical passage opening into a center of said combustion chamber.
Claim 2
Dependent Claim
110 words
A multi-valve internal combustion engine comprising: a plurality of intake valves for one cylinder; an engine body having a cylinder block formed with a cylinder bore, a cylinder head mounted on said cylinder block, and a piston, slidably received in said cylinder bore and, together with said cylinder block, cylinder bore and cylinder head, forming a combustion chamber; and intake ports, in the same number as there are intake valves, formed in said cylinder head and opening into said combustion chamber, one of said intake valves disposed in each of said intake ports, one of said intake ports forming a helical passage opening into a center of said combustion chamber.
Claim 3
Dependent Claim
29 words
A multi-valve internal combustion engine as recited in claim 1, and further comprising a spark plug located adjacent an intake valve disposed in said one of said intake ports.
Claim 4
Dependent Claim
24 words
A multi-valve internal combustion engine as recited in claim 2, and further comprising a fuel injector disposed in said one of said intake ports.
Claim 5
Dependent Claim
40 words
A multi-valve internal combustion engine as recited in claim 1, wherein said one of said intake ports is a center intake port and two side intake ports are disposed on opposite sides of a centerline of said center intake port.
Claim 6
Dependent Claim
27 words
A multi-valve internal combustion engine as recited in claim 4, and further comprising a spark plug located adjacent the intake valve disposed in said center intake port.
Claim 7
Dependent Claim
32 words
A multi-valve internal combustion engine as recited in claim 5, and further comprising a fuel injector disposed in said center intake port adjacent the intake valve disposed in said center intake port.
Claim 8
Dependent Claim
28 words
A multi-valve internal combustion engine as recited in claim 6, and further comprising a secondary fuel injector disposed adjacent the intake valve disposed in said center intake port.
Claim 9
Dependent Claim
28 words
A multi-valve internal combustion engine as recited in claim 7, wherein said secondary fuel injector is energized by control means when said engine operates at lower engine loads.
Claim 10
Dependent Claim
52 words
A multi-valve internal combustion engine as recited in claim 5, and further comprising an intake air control valve disposed in one of said two side intake ports, said intake air control valve being closed to shut said one of said two side intake ports when said engine operates at lower engine loads.
References Cited (Backward Citations)
JPS58113512A
Cited
US4548175A
Cited
US4570590A
Cited
JPS61204922A
Cited
JPS61215422A
Cited
JPH06334124A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1995-09-01 | 1996-03-02 | 1996-09-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1999-09-01 | 2000-03-02 | 2000-09-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2003-09-01 | 2004-03-02 | 2004-09-01 | $7700.00 | Window Closed / Lapsed |