Patent US4690106A successfully refreshed from Google Patents.
US4690106A
Expired / Lapsed
US
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Intake system for internal combustion engine
Assignee: Mazda Motor Corp
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Filing: 1986-06-27
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Granted: 1987-09-01
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Expires: 2006-06-27
Abstract
Abstract An intake system for an internal combustion engine comprises an intake manifold and a surge tank member connected together to form a plurality of long bowed first discrete intake passages each leading to one of the cylinders and a volume chamber disposed on the upstream ends of the first discrete intake passages. The intake manifold is further provided with a plurality of second discrete intake passages each of which branches off from one of the first discrete intake passages to extend on the inner side of the same and is shorter than the first discrete intake passages, and with a communicating passage for interconnecting the second discrete intake passages. A valve is provided in each second discrete intake passage to open and close the second discrete intake passage according to the operating condition of the engine. A part of the wall defining the communicating passage is formed by a plate member sandwiched between the intake manifold and the surge tank member.
Inventors
- 👤 Hideo Nakayama
- 👤 Shuichi Nakatani
- 👤 Fusatoshi Tanaka
- 👤 Hiroyuki Hanafusa
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 22:29
CPC Classifications
F; F02; F02B; F02B27/00; F02B27/02; F02B27/0205; F02B27/0215; F02B27/0221; F02B75/00; F02B75/16; F02B75/18; F02B2075/1804; F02B2075/1816; F02B27/0226; F02B27/0268; F02B27/0273; F02B75/20; Y; Y02; Y02T; Y02T10/00; Y02T10/10; Y02T10/12
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
177 words
An intake system for an internal combustion engine having a plurality of cylinders comprising an intake manifold and a surge tank member connected together to form a plurality of first discrete intake passages each of which leads to one of the cylinders and is bowed substantially in a vertical plane and a volume chamber disposed on upstream ends of the first discrete intake passages characterized in that the intake manifold is provided with a plurality of second discrete intake passages each of which branches off from one of the first discrete intake passages to extend from an the inner side of the same and is shorter than the first discrete intake passages, and with a communicating passage for interconnecting the second discrete intake passages, a passage switching means being provided to open and close the second discrete intake passages according to an operating condition of the engine and a part of a wall defining the communicating passage being formed by a plate member sandwiched between the intake manifold and an outer wall of the surge tank member.
Claim 2
Dependent Claim
177 words
An intake system for an internal combustion engine having a plurality of cylinders comprising an intake manifold and a surge tank member connected together to form a plurality of first discrete intake passages each of which leads to one of the cylinders and is bowed substantially in a vertical plane and a volume chamber disposed on upstream ends of the first discrete intake passages characterized in that the intake manifold is provided with a plurality of second discrete intake passages each of which branches off from one of the first discrete intake passages to extend from an the inner side of the same and is shorter than the first discrete intake passages, and with a communicating passage for interconnecting the second discrete intake passages, a passage switching means being provided to open and close the second discrete intake passages according to an operating condition of the engine and a part of a wall defining the communicating passage being formed by a plate member sandwiched between the intake manifold and an outer wall of the surge tank member.
Claim 3
Dependent Claim
22 words
An intake system as defined in claim 1 in which said plate member forms an upper wall portion of the communicating passage.
Claim 4
Dependent Claim
57 words
An intake system as defined in claim 2 in which said plate member has an area such as to cover the entire area of the mating faces of the intake manifold and the surge tank member and also functions as a sealing member for sealing the mating faces of the intake manifold and the surge tank member.
Claim 5
Dependent Claim
39 words
An intake system as defined in claim 3 in which said intake manifold is connected to a bottom face of the volume chamber by way of the plate member at an upper portion of the second discrete intake passages.
Claim 6
Dependent Claim
34 words
An intake system as defined in claim 2 in which the part of the plate member forming the upper wall portion of the communicating passage is upwardly convex and is formed by draw forming.
Claim 7
Dependent Claim
40 words
An intake system as defined in claim 2 in which the mating faces of the intake manifold and the surge tank member are in a horizontal plane substantially at the same height as the bottom face of the volume chamber.
Claim 8
Dependent Claim
45 words
An intake system as defined in claim 1 in which each of said first discrete intake passages first extends away from the engine body at the upstream portion thereof and turns toward the engine body to extend below the volume chamber at the downstream portion.
Claim 9
Dependent Claim
46 words
An intake system as defined in claim 7 in which said volume chamber and the upper portion of said first intake passages are integrally formed in the surge tank member, the volume chamber being formed to extend in the direction of the row of the cylinders.
Claim 10
Dependent Claim
32 words
An intake system as defined in claim 7 in which the upstream ends of the first discrete intake passages are connected to the upper portion of one side of the volume chamber.
Claim 11
Dependent Claim
45 words
An intake system as defined in claim 1 in which the volume of the volume chamber is not smaller than half of the displacement of the engine and the volume of the communicating passage is not larger than 1.5 times the displacement of the engine.
Claim 12
Dependent Claim
42 words
An intake system as defined in claim 10 in which the volume of the communicating passage is smaller than that of the volume chamber and the cross-sectional area of the communicating passage is larger than that of each first discrete intake passage.
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) | 1990-08-31 | 1991-03-02 | 1991-09-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1994-08-31 | 1995-03-02 | 1995-09-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1998-08-31 | 1999-03-02 | 1999-09-01 | $7700.00 | Window Closed / Lapsed |