EP0182223A2
Expired / Lapsed
EP
⏱️ 0.0 years remaining
Intake system for internal combustion engine
Assignee: Mazda Motor Corp
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Filing: 1985-11-08
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Granted: —
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Expires: 2005-11-08
Abstract
Abstract © An intake system for an internal combustion engine has an intake passage comprising a common passage portion opening to the atmosphere, a surge tank connected to the downstream end of the common passage portion and a plurality of discrete passage portions branching from the surge tank and respectively connected to the cylinders. At least one interconnecting passage is provided to communicate each of the discrete passage portions with at least one of the other discrete passage portions at a portion downstream of the surge tank, and an on-off valve is disposed at each junction of the interconnecting passage with the discrete passage portions to open and close each junction. The on-off valve is opened at least when the engine speed exceeds a predetermined speed during heavy load operation of the engine.
Inventors
- 👤 Mitsuo C/O Mazda Motor Corp. Hitomi
- 👤 Fumio C/O Mazda Motor Corp. Hinatase
- 👤 Yasuhiro C/O Mazda Motor Corp. Yuzuriha
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-10-30 22:37
CPC Classifications
F; F02; F02M; F02M35/00; F02M35/10; F02B; F02B27/00; F02B27/02; F02B27/0226; F02B27/0247; F02B27/0263; F02B27/0205; F02B27/0215; F02B27/0221; F02B27/0268; F02B27/0273; F02B75/00; F02B75/16; F02B75/18; F02B2075/1804; F02B2075/1816; F02B2075/1824; F02B27/0252; Y; Y02; Y02T; Y02T10/00; Y02T10/10; Y02T10/12
Claims Analysis
Total Claims: 30
Claim 1
Independent Claim
141 words
An intake system for an internal combustion engine having a plurality of cylinders comprising an intake passage including a common passage portion opening to the atmosphere, a surge tank connected to the downstream end of the common passage portion and a plurality of discrete passage portions branching from the surge tank and respectively connected to the cylinders; at least one interconnecting passage provided to communicate each of the discrete passage portions with at least one of the other discrete passage portions at a portion downstream of the surge tank; an on-off valve disposed at each junction of the interconnecting passage with the discrete passage portions to move between an open position and a closing position; and an actuator which moves the on-off valves to the open position as the engine speed increases at least during heavy load operation of the engine.
Claim 2
Dependent Claim
141 words
An intake system for an internal combustion engine having a plurality of cylinders comprising an intake passage including a common passage portion opening to the atmosphere, a surge tank connected to the downstream end of the common passage portion and a plurality of discrete passage portions branching from the surge tank and respectively connected to the cylinders; at least one interconnecting passage provided to communicate each of the discrete passage portions with at least one of the other discrete passage portions at a portion downstream of the surge tank; an on-off valve disposed at each junction of the interconnecting passage with the discrete passage portions to move between an open position and a closing position; and an actuator which moves the on-off valves to the open position as the engine speed increases at least during heavy load operation of the engine.
Claim 3
Dependent Claim
25 words
An intake system as defined in Claim 1 in which all the discrete passage portions are communicated with each other by a single interconnecting passage.
Claim 4
Dependent Claim
16 words
An intake system as defined in Claim 2 in which said cylinders are four in number.
Claim 5
Dependent Claim
52 words
An intake system as defined in Claim 1 in which said surge tank is larger in volume than said interconnecting passage, and the discrete passage portions are substantially equal to each other both in the overall length and in the length of the portion downstream of the junction with the interconnecting passage.
Claim 6
Dependent Claim
28 words
An intake system as defined in Claim 4 in which said interconnecting passage is not smaller in the effective cross section than each of the discrete passage portions.
Claim 7
Dependent Claim
28 words
An intake system as defined in Claim 1 in which said surge tank and the interconnecting passage both extend in the direction in which the cylinders are arranged.
Claim 8
Dependent Claim
23 words
An intake system as defined in Claim 6 in which said surge tank and the interconnecting passage are integrally formed into a unit.
Claim 9
Dependent Claim
29 words
An intake system as defined in Claim 7 in which the wall,portion of the surge tank forms at least a part of the wall portion of the interconnecting passage.
Claim 10
Dependent Claim
35 words
An intake system as defined in Claim 8 in which said surge tank and the interconnecting passage are formed side by side in an enlarged portion formed at an intermediate portion of the intake passage.
Claim 11
Dependent Claim
53 words
An intake system as defined in Claim 9 in which the internal space of the enlarged portion is divided into an upper space and a lower space by a partition wall, the former being larger than the latter, and the former and the latter respectively forming the surge tank and the interconnecting passage.
Claim 12
Dependent Claim
31 words
An intake system as defined in Claim 10 in which the junctions of the interconnecting passage with the discrete passage portions are formed in the lower wall of the enlarged portion.
Claim 13
Dependent Claim
41 words
An intake system as defined in Claim 11 in which upstream end portions of said discrete passage portions are bent upward along the periphery of said enlarged portion and connected to a side of the surge tank at the upstream end.
Claim 14
Dependent Claim
68 words
An intake system as defined in Claim 12 in which the surge tank and the upper portion of the upstream end portions of the discrete passage portions are integrally formed into a first unit and the interconnecting passage and the lower portion of the upstream end portions are integrally formed into a second unit, said first and second units being connected together with the partition wall intervening therebetween.
Claim 15
Dependent Claim
16 words
An intake system as defined in Claim 13 in which said cylinders are four in number.
Claim 16
Dependent Claim
52 words
An intake system as defined in Claim 13 in which said surge tank is larger in volume than said interconnecting passage, and the discrete passage portions are substantially equal to each other both in the overall length and in the length of the portion downstream of the junction with the interconnecting passage.
Claim 17
Dependent Claim
28 words
An intake system as defined in Claim 13 in which said interconnecting passage is not smaller in the effective cross section than each of the discrete passage portions.
Claim 18
Dependent Claim
58 words
An intake system as defined in Claim 8 in which said surge tank is formed in an enlarged portion of the intake passage and the interconnecting passage is formed by a tank-like portion which is formed integrally with the enlarged portion forming the surge tank and has a part of the wall in common with the enlarged portion.
Claim 19
Dependent Claim
32 words
An intake system as defined in Claim 17 in which the upstream end portions of the discrete passage portions are formed along the periphery of the enlarged portion and the tank-like portion.
Claim 20
Dependent Claim
65 words
An intake system as defined in Claim 18 in which the enlarged portion, and the parts of the tank-like portion and the discrete passage portions above an intermediate portion of the tank-like portion are formed integrally with each other, and the parts of the tank-like portion and the discrete passage portion below the intermediate portion of the tank-like portion are formed integrally with each other.
Claim 21
Dependent Claim
16 words
An intake system as defined in Claim 19 in which said cylinders are four in number.
Claim 22
Dependent Claim
52 words
An intake system as defined in Claim 19 in which said surge tank is larger in volume than said interconnecting passage, and the discrete passage portions are substantially equal to each other both in the overall length and in the length of the portion downstream of the junction with the interconnecting passage.
Claim 23
Dependent Claim
28 words
An intake system as defined in Claim 19 in which said interconnecting passage is not smaller in the effective cross section than each of the discrete passage portions.
Claim 24
Dependent Claim
41 words
An intake system as defined in Claim 7 in which the upstream end portions of said discrete passage portions are formed along the periphery of the surge tank and defined by a part of the wall portion forming the surge tank.
Claim 25
Dependent Claim
40 words
An intake system as defined in Claim 23 in which said discrete passage portions are bent upward to be convex outwardly and said interconnecting passage is disposed below the surge tank on the inner side of the discrete passage portions.
Claim 26
Dependent Claim
25 words
An intake system as defined in Claim 24 in which all the discrete passage portions are communicated with each other by a single interconnecting passage.
Claim 27
Dependent Claim
35 words
An intake system as defined in Claim 25 in which said on-off valves are operatively connected to a single shaft so that all the on-off valves are opened and closed by operating the single shaft.
Claim 28
Dependent Claim
16 words
An intake system as defined in Claim 26 in which said cylinders are four in number.
Claim 29
Dependent Claim
52 words
An intake system as defined in Claim 27 in which said surge tank is larger in volume than said interconnecting passage, and the discrete passage portions are substantially equal to each other both in the overall length and in the length of the portion downstream of the junction with the interconnecting passage.
Claim 30
Dependent Claim
28 words
An intake system as defined in Claim 27 in which said interconnecting passage is not smaller in its effective cross section than each of the discrete passage portions.
References Cited (Backward Citations)
No citation records indexed.
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