US4683855A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Multiple valve engine
Assignee: Yamaha Motor Co Ltd
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Filing: 1985-08-12
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Granted: 1987-08-04
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Expires: 2005-08-12
Abstract
Abstract An induction system for an internal combustion engine for improving running throughout the entire engine speed and load ranges. The induction system comprises a first intake passage that serves the chamber through a first intake port and a second intake passage that serves the chamber through second and third intake ports. The effective cross-sectional area of the first intake passage is substantially smaller than that of the second intake passage and staged throttle valves are incorporated so that the charge requirements at low speed are supplied primarily through the first intake passage.
Inventors
- 👤 Franz Laimbock
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 11:24
CPC Classifications
F; F02; F02M; F02M35/00; F02M35/10; F02M35/1015; F02M35/10183; F01; F01L; F01L1/00; F01L1/26; F01L1/265; F02B; F02B31/00; F02B31/08; F02B31/087; F02F; F02F1/00; F02F1/24; F02F1/42; F02F1/4214; F02F1/4221; F02M13/00; F02M13/02; F02M13/023; F02M35/10006; F02M35/10072; F02M35/10091; F02M35/10118; F02M35/104; F02M35/108; F02M35/1085; F01L3/00; F01L2003/25; F01L2003/256; F02B1/00; F02B1/02; F02B1/04; F02B75/00; F02B75/02; F02B2075/022; F02B2075/027; F02B2275/00; F02B2275/18; F02B61/00; F02B61/06; F02F2001/244; F02F2001/245; Y; Y02; Y02T; Y02T10/00; Y02T10/10; Y02T10/12
Claims Analysis
Total Claims: 13
Claim 1
Independent Claim
57 words
An induction system for an internal combustion engine comprising a variable volume chamber, a first intake passage communicating with said chamber through a first intake port, and a second intake passage communicating with said chamber through second and third intake ports, said first intake passage having a substantially smaller effective cross-sectional area than said second intake passage.
Claim 2
Dependent Claim
57 words
An induction system for an internal combustion engine comprising a variable volume chamber, a first intake passage communicating with said chamber through a first intake port, and a second intake passage communicating with said chamber through second and third intake ports, said first intake passage having a substantially smaller effective cross-sectional area than said second intake passage.
Claim 3
Dependent Claim
18 words
An induction system as set forth in claim 1 wherein the intake ports are all the same size.
Claim 4
Dependent Claim
26 words
A induction system as set forth in claim 2 further including poppet valve means received in each of the intake ports for controlling the flow therethrough.
Claim 5
Dependent Claim
59 words
An induction system as set forth in claim 3 further including throttle valve means for controlling the flow through the intake passages so that substantially all of the idle and low speed charge requirements of the chamber are supplied through the first intake passage and the wide open throttle requirements are provided by the first and second intake passages.
Claim 6
Dependent Claim
24 words
An induction system as set forth in claim 4 wherein the throttle valve means comprises a throttle valve in each of the induction passages.
Claim 7
Dependent Claim
38 words
An induction system as set forth in claim 4 further including a first charge former for supplying a charge to the first intake passage and a second charge former for supplying a charge to the second intake passage.
Claim 8
Dependent Claim
27 words
An induction system as set forth in claim 6 wherein the charge formers have respective throttle valves and the throttle valves are operated in the staged sequence.
Claim 9
Dependent Claim
59 words
An induction system as set forth in claim 1 further including throttle valve means for controlling the flow through the intake passages so that substantially all of the idle and low speed charge requirements of the chamber are supplied through the first intake passage and the wide open throttle requirements are provided by the first and second intake passages.
Claim 10
Dependent Claim
24 words
An induction system as set forth in claim 8 wherein the throttle valve means comprises a throttle valve in each of the induction passages.
Claim 11
Dependent Claim
38 words
An induction system as set forth in claim 8 further including a first charge former for supplying a charge to the first intake passage and a second charge former for supplying a charge to the second intake passage.
Claim 12
Dependent Claim
27 words
An induction system as set forth in claim 10 wherein the charge formers have respective throttle valves and the throttle valves are operated in the staged sequence.
Claim 13
Dependent Claim
26 words
An induction system as set forth in claim 1 further including poppet valve means received in each of the intake ports for controlling the flow therethrough.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1990-08-03 | 1991-02-02 | 1991-08-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1994-08-03 | 1995-02-02 | 1995-08-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1998-08-03 | 1999-02-02 | 1999-08-04 | $7700.00 | Window Closed / Lapsed |