EP0092595A1 - An intake system for a multi-cylinder engine - Google Patents
An intake system for a multi-cylinder engine Download PDFInfo
- Publication number
- EP0092595A1 EP0092595A1 EP82103523A EP82103523A EP0092595A1 EP 0092595 A1 EP0092595 A1 EP 0092595A1 EP 82103523 A EP82103523 A EP 82103523A EP 82103523 A EP82103523 A EP 82103523A EP 0092595 A1 EP0092595 A1 EP 0092595A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- intake
- engine
- passages
- intake manifold
- passage
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
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Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
- F02M35/00—Combustion-air cleaners, air intakes, intake silencers, or induction systems specially adapted for, or arranged on, internal-combustion engines
- F02M35/10—Air intakes; Induction systems
- F02M35/10006—Air intakes; Induction systems characterised by the position of elements of the air intake system in direction of the air intake flow, i.e. between ambient air inlet and supply to the combustion chamber
- F02M35/10078—Connections of intake systems to the engine
- F02M35/10085—Connections of intake systems to the engine having a connecting piece, e.g. a flange, between the engine and the air intake being foreseen with a throttle valve, fuel injector, mixture ducts or the like
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
- F02M35/00—Combustion-air cleaners, air intakes, intake silencers, or induction systems specially adapted for, or arranged on, internal-combustion engines
- F02M35/10—Air intakes; Induction systems
- F02M35/1015—Air intakes; Induction systems characterised by the engine type
- F02M35/10183—Engines having intake ducts fed from a separate carburettor or injector, the idling system being considered as a separate carburettor
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
- F02M35/00—Combustion-air cleaners, air intakes, intake silencers, or induction systems specially adapted for, or arranged on, internal-combustion engines
- F02M35/10—Air intakes; Induction systems
- F02M35/10242—Devices or means connected to or integrated into air intakes; Air intakes combined with other engine or vehicle parts
- F02M35/10255—Arrangements of valves; Multi-way valves
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
- F02M35/00—Combustion-air cleaners, air intakes, intake silencers, or induction systems specially adapted for, or arranged on, internal-combustion engines
- F02M35/10—Air intakes; Induction systems
- F02M35/10242—Devices or means connected to or integrated into air intakes; Air intakes combined with other engine or vehicle parts
- F02M35/10268—Heating, cooling or thermal insulating means
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
- F02M35/00—Combustion-air cleaners, air intakes, intake silencers, or induction systems specially adapted for, or arranged on, internal-combustion engines
- F02M35/10—Air intakes; Induction systems
- F02M35/104—Intake manifolds
- F02M35/108—Intake manifolds with primary and secondary intake passages
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
- F02M35/00—Combustion-air cleaners, air intakes, intake silencers, or induction systems specially adapted for, or arranged on, internal-combustion engines
- F02M35/10—Air intakes; Induction systems
- F02M35/104—Intake manifolds
- F02M35/112—Intake manifolds for engines with cylinders all in one line
Definitions
- the invention relates to an intake system for a multi-cylinder engine and contemplates to provide an engine which has such a low weight and a high output power that it is suitable for use with an automobile, and relates specifically to such an intake system for a multi-cylinder engine as can feed an air-fuel mixture from a single carburettor to a plurality of cylinders.
- both three or four cylinders arranged in straight and a downdraft type dual carburettor shared among the cylinders are connected through a banana or tournament-shaped intake manifold.
- each combustion chamber with two intake valves, to provide the respective intake valves with independent intake passages and to provide the respective intake passages with carburettors.
- the present invention as claimed has been conceived in view of the background thus far described and has an object to raise the output power of the engine while minimizing the complexness in the construction and the increase in the weight.
- the advantages offered by the invention are mainly that with a simple, reliable and lightweight design of a manifold system of the kind in question with branch portions partitioned into first and second intake passages and with control valves in the second intake passages an increase in the engine output power at all operational levels can be effected and the reduction in acceleration responsiveness of the engine at a low output range is minimized. Production of the intake system can be effected at low cost.
- Reference numeral 1 appearing in the drawings indicates a multi-cylinder engine such as a four- cylinder engine which has four combustion chambers 2.
- Each of the combustion chambers 2 is defined by a cylinder 3, a piston 4 and a cylinder head 5 and is connected to an intake passage 8 and an exhaust passage 13 through intake and exhaust valves 6 and 7 which are disposed in the cylinder head 5.
- the intake passage 8 is formed in series to lead from the cylinder heads 5 through an intake manifold 9 and a carburet cor.10.
- the intake manifold 9 is composed of a trunk portion 9a and four branch portions 9b branched from the trunk portion 9a.
- Each of the branch portions 9b is composed of first and second intake passages 8a and 8b which are partitioned at the right and left sides by a partition 9c
- Characters 9d indicate a hot water riser which forms the bottom of the trunk portion 9a so that it is heated to about 80°C by the cooling water of the engine to abruptly gasify the fuel droplets contained in the air-fuel mixture, when it is wetted with the latter, thereby to make uniform the air-fuel ratio of the mixture to be distributed into the respective branch portions 9b.
- the carburettor 10 is of such a well known dual type as is formed with both a primary passage P having a manual throttle valve 10a and a secondary passage S having an automatic throttle valve 10b which is to be opened during a high output operation of the engine.
- Characters 10c indicate a main fuel injection port which is opened into a venturi portion 10e through a small venturi 10d.
- Numeral 11 indicates a valve drum which is sandwiched between the intake manifold and the cylinder heads 5 such that it supports butterfly type control valves 12 in openable and closable manners within the second intake passages 8b therein.
- the control valves 12 are connected to the actuating rod 15a of a diaphragm device 15 through an arm 14, which is fixed to the common valve stem thereof, so that they are opened and closed by the operation of the diaphragm device 15. More specifically, the diaphragm device 15 has its inside chamber defined by a casing 15b and partitioned by an elastic diaphragm 15c into two compartments, one of which provides an atmospheric compartment 15d leading to the atmosphere and the other of which provides a vacuum compartment communicating with the aforementioned venturi portion 10e through a duct 16. Characters 15f indicate a return spring which is made operative to urge said elastic diaphragm 15c toward the atmospheric compartment 15d at all times.
- the multi-cylinder engine 1 having the construction thus far described is run at a state with the manual throttle valve 10a having its idling opening or its small opening in the neighbourhood of the idling opening, the intake air is sucked from the primary passage P, because the automatic throttle valve 10 is closed in such low load range, and is admixed at the venturi portion 10e with the fuel into an air-fuel mixture, which is metered by the manual throttle valve 10a to flow into the intake manifold 9 until it is distributed into the respective branch portions 9b.
- the diaphragm device 15 Since, at this running state, the flow rate of the intake air is so small that the venturi vacuum is low (namely, the absolute pressure is high), the diaphragm device 15 has its elastic diaphragm 15c warped toward the atmospheric compartment 15d by the elastic force of the return spring 15f thereby to close the control valves 12 connected thereto. As a result, the mixture wholly reaches the intake valves 6 at a high speed through the first intake passages 3a forming a part of the intake passage 8 until it flows into the combustion chambers 2 when the intake valves 6 are opened.
- the mixture having its gasification promoted by the riser 9d is sucked into the combustion chambers 2 without inviting a disadvantage that the fuel is condensed again in the first intake passages 8a having a high flow speed until it wets the inner wall thereof.
- fluctuations in the air-fuel ratio of the mixture to be fed to the respective combustion chambers 2 are so reduced and the stability of the combustions is so excellent that a keen acceleration responsiveness can be attained.
- the automatic throttle valve 10b is also opened so that the intake air flows into not only the first intake passage 8a but also the second intake passage 8b . Since, at this time, the flow rate of the intake air is remarkably increased, the flow speeds of the intake air streams in both the intake passages 8a and 8b are so sufficiently high that the fluctuations in the air-fuel ratio in the mixture can be reduced and that a high output power can be achieved.
- the present invention there are disposed at each of the branch portions of the intake manifold said first and second intake passages which are partitioned by the partition and the second intake passages are equipped with the control valves which are adapted to be opened only during the high output operation of the engine.
- the control valves are closed to reduce the effective areas of the intake passages at the branch portions thereby to prevent the intake flow speed from being lowered.
- the partitions are disposed at the branch portions, there can be attained advantages that the intake manifold can be produced relatively easily and that the distribution of the mixture among the respective branch portions is made less non-uniform than in the case in which the partitions are disposed to protrude into the trunk portion of the intake manifold.
Landscapes
- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Control Of Throttle Valves Provided In The Intake System Or In The Exhaust System (AREA)
Abstract
Description
- The invention relates to an intake system for a multi-cylinder engine and contemplates to provide an engine which has such a low weight and a high output power that it is suitable for use with an automobile, and relates specifically to such an intake system for a multi-cylinder engine as can feed an air-fuel mixture from a single carburettor to a plurality of cylinders.
- In most of small-sized engines for automobiles according to the prior art, both three or four cylinders arranged in straight and a downdraft type dual carburettor shared among the cylinders are connected through a banana or tournament-shaped intake manifold. In order to increase the output power of that engine to a high level or to prevent the acceleration responsiveness of the same from being deteriorated while ensuring the high output power, it is known in the art to provide each combustion chamber with two intake valves, to provide the respective intake valves with independent intake passages and to provide the respective intake passages with carburettors.
- Nevertheless, such structure has its construction complicated and its weight increased, although it is excellent in performance, so that it cannot avoid industrial disadvantages such as rise in the production cost and deterioration in the fuel economy of the engine.
- The present invention as claimed has been conceived in view of the background thus far described and has an object to raise the output power of the engine while minimizing the complexness in the construction and the increase in the weight.
- The advantages offered by the invention are mainly that with a simple, reliable and lightweight design of a manifold system of the kind in question with branch portions partitioned into first and second intake passages and with control valves in the second intake passages an increase in the engine output power at all operational levels can be effected and the reduction in acceleration responsiveness of the engine at a low output range is minimized. Production of the intake system can be effected at low cost.
- One specific embodiment of the invention will now be described with reference to the accompanying drawings in which:-
- Fig. 1 is a sectional view showing the essential portion of a multi-cylinder engine with an intake system according to the invention and;
- Fig. 2 is a broken top plan view showing the same portion.
-
Reference numeral 1 appearing in the drawings indicates a multi-cylinder engine such as a four- cylinder engine which has fourcombustion chambers 2. Each of thecombustion chambers 2 is defined by acylinder 3, a piston 4 and acylinder head 5 and is connected to anintake passage 8 and anexhaust passage 13 through intake andexhaust valves cylinder head 5. Theintake passage 8 is formed in series to lead from thecylinder heads 5 through anintake manifold 9 and a carburet cor.10. Theintake manifold 9 is composed of atrunk portion 9a and fourbranch portions 9b branched from thetrunk portion 9a. Each of thebranch portions 9b is composed of first andsecond intake passages partition 9c Characterstrunk portion 9a so that it is heated to about 80°C by the cooling water of the engine to abruptly gasify the fuel droplets contained in the air-fuel mixture, when it is wetted with the latter, thereby to make uniform the air-fuel ratio of the mixture to be distributed into therespective branch portions 9b. - The
carburettor 10 is of such a well known dual type as is formed with both a primary passage P having amanual throttle valve 10a and a secondary passage S having anautomatic throttle valve 10b which is to be opened during a high output operation of the engine.Characters 10c indicate a main fuel injection port which is opened into a venturi portion 10e through a small venturi 10d.Numeral 11 indicates a valve drum which is sandwiched between the intake manifold and thecylinder heads 5 such that it supports butterflytype control valves 12 in openable and closable manners within thesecond intake passages 8b therein. Thecontrol valves 12 are connected to the actuatingrod 15a of adiaphragm device 15 through anarm 14, which is fixed to the common valve stem thereof, so that they are opened and closed by the operation of thediaphragm device 15. More specifically, thediaphragm device 15 has its inside chamber defined by acasing 15b and partitioned by anelastic diaphragm 15c into two compartments, one of which provides anatmospheric compartment 15d leading to the atmosphere and the other of which provides a vacuum compartment communicating with the aforementioned venturi portion 10e through aduct 16.Characters 15f indicate a return spring which is made operative to urge saidelastic diaphragm 15c toward theatmospheric compartment 15d at all times. - If the
multi-cylinder engine 1 having the construction thus far described is run at a state with themanual throttle valve 10a having its idling opening or its small opening in the neighbourhood of the idling opening, the intake air is sucked from the primary passage P, because theautomatic throttle valve 10 is closed in such low load range, and is admixed at the venturi portion 10e with the fuel into an air-fuel mixture, which is metered by themanual throttle valve 10a to flow into theintake manifold 9 until it is distributed into therespective branch portions 9b. Since, at this running state, the flow rate of the intake air is so small that the venturi vacuum is low (namely, the absolute pressure is high), thediaphragm device 15 has itselastic diaphragm 15c warped toward theatmospheric compartment 15d by the elastic force of thereturn spring 15f thereby to close thecontrol valves 12 connected thereto. As a result, the mixture wholly reaches theintake valves 6 at a high speed through the first intake passages 3a forming a part of theintake passage 8 until it flows into thecombustion chambers 2 when theintake valves 6 are opened. As a result, the mixture having its gasification promoted by theriser 9d is sucked into thecombustion chambers 2 without inviting a disadvantage that the fuel is condensed again in thefirst intake passages 8a having a high flow speed until it wets the inner wall thereof. As a result, fluctuations in the air-fuel ratio of the mixture to be fed to therespective combustion chambers 2 are so reduced and the stability of the combustions is so excellent that a keen acceleration responsiveness can be attained. - If the
manual throttle valve 10a is so widely opened as to augment the engine output power, the flow rate of the intake air to be introduced from the primary passage P is increased so that the venturi vacuum to be established in the venturi portion 10e is raised (in other words, the absolute pressure is lowered). As a result, that high venturi vacuum pressure is exerted through theduct 16 upon thevacuum compartment 15e to pull theelastic diaphragm 15d toward thevacuum compartment 15e against the elastic force of thereturn spring 15f so that the actuatingrod 15a pulls thearm 14 thereby to open thecontrol valves 12 to have an opening corresponding to the magnitude of the venturi vacuum. - If the
manual throttle valve 10a is opened to the neighbourhood of its full opening, theautomatic throttle valve 10b is also opened so that the intake air flows into not only thefirst intake passage 8a but also thesecond intake passage 8b . Since, at this time, the flow rate of the intake air is remarkably increased, the flow speeds of the intake air streams in both theintake passages - As has been described hereinbefore, according to the present invention, there are disposed at each of the branch portions of the intake manifold said first and second intake passages which are partitioned by the partition and the second intake passages are equipped with the control valves which are adapted to be opened only during the high output operation of the engine. As a result, during a low output operation of the engine having a low flow rate of the mixture, the control valves are closed to reduce the effective areas of the intake passages at the branch portions thereby to prevent the intake flow speed from being lowered. Thus, without changing so much the conventional construction using the dual carburettor and the intake manifold, an increase in the engine output power can be effected,, and the reduction in the acceleration responsiveness in a low output range at that time can be minimized. Moreover, since the partitions are disposed at the branch portions, there can be attained advantages that the intake manifold can be produced relatively easily and that the distribution of the mixture among the respective branch portions is made less non-uniform than in the case in which the partitions are disposed to protrude into the trunk portion of the intake manifold.
Claims (4)
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
EP82103523A EP0092595B1 (en) | 1982-04-26 | 1982-04-26 | An intake system for a multi-cylinder engine |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
EP82103523A EP0092595B1 (en) | 1982-04-26 | 1982-04-26 | An intake system for a multi-cylinder engine |
Publications (2)
Publication Number | Publication Date |
---|---|
EP0092595A1 true EP0092595A1 (en) | 1983-11-02 |
EP0092595B1 EP0092595B1 (en) | 1987-11-04 |
Family
ID=8189006
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP82103523A Expired EP0092595B1 (en) | 1982-04-26 | 1982-04-26 | An intake system for a multi-cylinder engine |
Country Status (1)
Country | Link |
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EP (1) | EP0092595B1 (en) |
Citations (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS5446508A (en) * | 1977-09-20 | 1979-04-12 | Teac Co | Production f information signal recording carrier |
GB2011537A (en) * | 1977-12-26 | 1979-07-11 | Yamaha Motor Co Ltd | Vehicle engine control |
US4174686A (en) * | 1976-10-09 | 1979-11-20 | Toyo Kogyo Co., Ltd. | Intake system for internal combustion engines |
US4271801A (en) * | 1977-10-12 | 1981-06-09 | Toyota Jidosha Kogyo Kabushiki Kaisha | Internal combustion engine with twin intake ports for each cylinder |
US4317438A (en) * | 1978-10-06 | 1982-03-02 | Honda Giken Kogyo Kabushiki Kaisha | High power output engine |
US4319553A (en) * | 1978-07-14 | 1982-03-16 | Yamaha Hatsudoki Kabushiki Kaisha | Induction control system for internal combustion engine |
-
1982
- 1982-04-26 EP EP82103523A patent/EP0092595B1/en not_active Expired
Patent Citations (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4174686A (en) * | 1976-10-09 | 1979-11-20 | Toyo Kogyo Co., Ltd. | Intake system for internal combustion engines |
JPS5446508A (en) * | 1977-09-20 | 1979-04-12 | Teac Co | Production f information signal recording carrier |
US4271801A (en) * | 1977-10-12 | 1981-06-09 | Toyota Jidosha Kogyo Kabushiki Kaisha | Internal combustion engine with twin intake ports for each cylinder |
GB2011537A (en) * | 1977-12-26 | 1979-07-11 | Yamaha Motor Co Ltd | Vehicle engine control |
US4319553A (en) * | 1978-07-14 | 1982-03-16 | Yamaha Hatsudoki Kabushiki Kaisha | Induction control system for internal combustion engine |
US4317438A (en) * | 1978-10-06 | 1982-03-02 | Honda Giken Kogyo Kabushiki Kaisha | High power output engine |
Also Published As
Publication number | Publication date |
---|---|
EP0092595B1 (en) | 1987-11-04 |
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