US5018485A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Intake system for automative engine
Assignee: Yamaha Motor Co Ltd
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Filing: 1990-02-27
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Granted: 1991-05-28
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Expires: 2010-02-27
Abstract
Abstract An improved induction system for an internal combustion engine that improves power throughout the entire speed and load ranges by including two plenum chambers, having separate intake passage that serve the cylinders of the engine. One plenum chamber and its intake passages is designed to improve low and midrange performance while the other plenum chamber and its intake passage is tuned for high speed performance. An atmospheric air inlet is provided only for the latter plenum chamber and the first mentioned plenum chamber receives its atmospheric air from this plenum chamber through a connecting passageway.
Inventors
- 👤 Takehiro Washizu
- 👤 Tsutomu Nagamatsu
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 06:31
CPC Classifications
F; F02; F02B; F02B27/00; F02B27/02; F02B27/0226; F02B27/0247; F02B27/0252; F02B27/0205; F02B27/0215; F02B27/0221; F02B27/0268; F02B27/0273; F02B75/00; F02B75/16; F02B75/18; F02B75/20; F02B2075/1804; F02B2075/1816; F02B2275/00; F02B2275/18; F02F; F02F1/00; F02F1/24; F02F2001/244; F02F2001/245; Y; Y02; Y02T; Y02T10/00; Y02T10/10; Y02T10/12
Claims Analysis
Total Claims: 13
Claim 1
Independent Claim
152 words
An induction system for an internal combustion engine having a combustion chamber, a first plenum chamber, first intake passage means communicating said first plenum chamber with said combustion chamber, a second plenum chamber spaced from said first plenum chamber, second intake passage means communicating said second plenum chamber with said combustion chamber, said first intake passage means and said first plenum chamber being tuned to improve low and midrange performance of the engine, said second plenum chamber and said second intake passage means being tuned to improve the high speed running conditions of said engine, an atmospheric air inlet only to said second plenum chamber, throttle valve means for controlling the communication of said second plenum chamber with said combustion chamber, and conduit means communicating said second plenum chamber with said first plenum chamber for providing the sole source of atmospheric air from said atmospheric air inlet for said first plenum chamber.
Claim 2
Dependent Claim
152 words
An induction system for an internal combustion engine having a combustion chamber, a first plenum chamber, first intake passage means communicating said first plenum chamber with said combustion chamber, a second plenum chamber spaced from said first plenum chamber, second intake passage means communicating said second plenum chamber with said combustion chamber, said first intake passage means and said first plenum chamber being tuned to improve low and midrange performance of the engine, said second plenum chamber and said second intake passage means being tuned to improve the high speed running conditions of said engine, an atmospheric air inlet only to said second plenum chamber, throttle valve means for controlling the communication of said second plenum chamber with said combustion chamber, and conduit means communicating said second plenum chamber with said first plenum chamber for providing the sole source of atmospheric air from said atmospheric air inlet for said first plenum chamber.
Claim 3
Dependent Claim
22 words
An induction system as set forth in claim 1 further including further throttle valve means for controlling the speed of the engine.
Claim 4
Dependent Claim
26 words
An induction system as set forth in claim 2 wherein the further throttle valve means comprises a single throttle valve positioned in the atmospheric air inlet.
Claim 5
Dependent Claim
25 words
An induction system as set forth in claim 3 wherein the first mentioned throttle valve means is operated in response to an engine running condition.
Claim 6
Dependent Claim
17 words
An induction system as set forth in claim 4 wherein the engine running condition comprises engine load.
Claim 7
Dependent Claim
16 words
An induction system as set forth in claim 4 wherein the engine running condition comprises speed.
Claim 8
Dependent Claim
21 words
An induction system as set forth in claim 4 wherein the first and second intake passage means has a common portion.
Claim 9
Dependent Claim
21 words
An induction system as set forth in claim 7 wherein the plenum chambers are positioned on opposite sides of the engine.
Claim 10
Dependent Claim
20 words
An induction system as set forth in claim 8 wherein the engine has its cylinder bore inclined from the vertical.
Claim 11
Dependent Claim
21 words
An induction system as set forth in claim 1 wherein the first and second intake passage means has a common portion.
Claim 12
Dependent Claim
21 words
An induction system as set forth in claim 10 wherein the plenum chambers are positioned on opposite sides of the engine.
Claim 13
Dependent Claim
20 words
An induction system as set forth in claim 11 wherein the engine has its cylinder bore inclined from the vertical.
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) | 1994-05-27 | 1994-11-26 | 1995-05-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1998-05-27 | 1998-11-26 | 1999-05-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2002-05-27 | 2002-11-26 | 2003-05-28 | $7700.00 | Window Closed / Lapsed |