WO2008013045A1 - Moteur à combustion interne à quatre temps - Google Patents
Moteur à combustion interne à quatre temps Download PDFInfo
- Publication number
- WO2008013045A1 WO2008013045A1 PCT/JP2007/063638 JP2007063638W WO2008013045A1 WO 2008013045 A1 WO2008013045 A1 WO 2008013045A1 JP 2007063638 W JP2007063638 W JP 2007063638W WO 2008013045 A1 WO2008013045 A1 WO 2008013045A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- gas
- combustion chamber
- gas storage
- storage chamber
- cylinder head
- Prior art date
Links
- 238000002485 combustion reaction Methods 0.000 title claims abstract description 244
- 238000003860 storage Methods 0.000 claims description 238
- 238000004891 communication Methods 0.000 claims description 84
- 230000013011 mating Effects 0.000 claims description 17
- 230000002093 peripheral effect Effects 0.000 claims description 14
- 239000007789 gas Substances 0.000 abstract description 352
- 239000000567 combustion gas Substances 0.000 abstract description 10
- MWUXSHHQAYIFBG-UHFFFAOYSA-N nitrogen oxide Inorganic materials O=[N] MWUXSHHQAYIFBG-UHFFFAOYSA-N 0.000 description 42
- 239000000446 fuel Substances 0.000 description 22
- 238000012986 modification Methods 0.000 description 15
- 230000004048 modification Effects 0.000 description 15
- 238000010586 diagram Methods 0.000 description 11
- 230000000694 effects Effects 0.000 description 9
- 230000006872 improvement Effects 0.000 description 5
- 239000000203 mixture Substances 0.000 description 5
- 239000004215 Carbon black (E152) Substances 0.000 description 4
- 229930195733 hydrocarbon Natural products 0.000 description 4
- 150000002430 hydrocarbons Chemical class 0.000 description 4
- 230000009471 action Effects 0.000 description 3
- 230000000052 comparative effect Effects 0.000 description 3
- 238000006073 displacement reaction Methods 0.000 description 3
- 238000000034 method Methods 0.000 description 3
- 230000008569 process Effects 0.000 description 3
- 230000006698 induction Effects 0.000 description 2
- 238000011144 upstream manufacturing Methods 0.000 description 2
- 238000013459 approach Methods 0.000 description 1
- 238000001816 cooling Methods 0.000 description 1
- 238000005520 cutting process Methods 0.000 description 1
- 230000003247 decreasing effect Effects 0.000 description 1
- 238000007599 discharging Methods 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 238000005242 forging Methods 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 238000004080 punching Methods 0.000 description 1
- 238000000746 purification Methods 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- 239000004071 soot Substances 0.000 description 1
- 238000013517 stratification Methods 0.000 description 1
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02B—INTERNAL-COMBUSTION PISTON ENGINES; COMBUSTION ENGINES IN GENERAL
- F02B21/00—Engines characterised by air-storage chambers
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02B—INTERNAL-COMBUSTION PISTON ENGINES; COMBUSTION ENGINES IN GENERAL
- F02B31/00—Modifying induction systems for imparting a rotation to the charge in the cylinder
- F02B31/08—Modifying induction systems for imparting a rotation to the charge in the cylinder having multiple air inlets
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02B—INTERNAL-COMBUSTION PISTON ENGINES; COMBUSTION ENGINES IN GENERAL
- F02B31/00—Modifying induction systems for imparting a rotation to the charge in the cylinder
- F02B31/08—Modifying induction systems for imparting a rotation to the charge in the cylinder having multiple air inlets
- F02B31/085—Modifying induction systems for imparting a rotation to the charge in the cylinder having multiple air inlets having two inlet valves
-
- 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
- F02M26/00—Engine-pertinent apparatus for adding exhaust gases to combustion-air, main fuel or fuel-air mixture, e.g. by exhaust gas recirculation [EGR] systems
- F02M26/13—Arrangement or layout of EGR passages, e.g. in relation to specific engine parts or for incorporation of accessories
- F02M26/17—Arrangement or layout of EGR passages, e.g. in relation to specific engine parts or for incorporation of accessories in relation to the intake system
- F02M26/20—Feeding recirculated exhaust gases directly into the combustion chambers or into the intake runners
-
- 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
- F02M26/00—Engine-pertinent apparatus for adding exhaust gases to combustion-air, main fuel or fuel-air mixture, e.g. by exhaust gas recirculation [EGR] systems
- F02M26/13—Arrangement or layout of EGR passages, e.g. in relation to specific engine parts or for incorporation of accessories
- F02M26/37—Arrangement or layout of EGR passages, e.g. in relation to specific engine parts or for incorporation of accessories with temporary storage of recirculated exhaust gas
-
- 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
- F02M26/00—Engine-pertinent apparatus for adding exhaust gases to combustion-air, main fuel or fuel-air mixture, e.g. by exhaust gas recirculation [EGR] systems
- F02M26/13—Arrangement or layout of EGR passages, e.g. in relation to specific engine parts or for incorporation of accessories
- F02M26/40—Arrangement or layout of EGR passages, e.g. in relation to specific engine parts or for incorporation of accessories with timing means in the recirculation passage, e.g. cyclically operating valves or regenerators; with arrangements involving pressure pulsations
-
- 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
- F02M26/00—Engine-pertinent apparatus for adding exhaust gases to combustion-air, main fuel or fuel-air mixture, e.g. by exhaust gas recirculation [EGR] systems
- F02M26/13—Arrangement or layout of EGR passages, e.g. in relation to specific engine parts or for incorporation of accessories
- F02M26/41—Arrangement or layout of EGR passages, e.g. in relation to specific engine parts or for incorporation of accessories characterised by the arrangement of the recirculation passage in relation to the engine, e.g. to cylinder heads, liners, spark plugs or manifolds; characterised by the arrangement of the recirculation passage in relation to specially adapted combustion chambers
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
- Y02T10/00—Road transport of goods or passengers
- Y02T10/10—Internal combustion engine [ICE] based vehicles
- Y02T10/12—Improving ICE efficiencies
Definitions
- the present invention relates to a four-cycle internal combustion engine, and in particular, a four-cycle internal combustion engine in which swirl is generated by exhaust gas (burned gas) or fresh air (air alone or a mixture of air and fuel). About.
- exhaust gas recirculation that lowers the maximum combustion temperature and reduces nitrogen oxides (NOx) by slowing the combustion of the air-fuel mixture in the combustion chamber by returning a part of the exhaust gas to the combustion chamber
- EGR Exhaust Gas Re-circulation
- an EGR having the following configuration is known (see, for example, Patent Document 1). Specifically, the EGR stores a sub-exhaust valve provided in a sub-exhaust port connected to the combustion chamber, and a part of already burned gas (EGR gas) discharged through the sub-exhaust port. Gas storage room. The EGR gas stored in the gas storage chamber is returned to the combustion chamber at a predetermined timing.
- EGR gas already burned gas
- Patent Document 1 JP-A-5-86992 (Pages 4-5, Figure 4-5)
- a four-cycle internal combustion engine equipped with the above-described conventional EGR requires a sub exhaust port and a sub exhaust valve in addition to a main exhaust port and a main exhaust valve that discharge exhaust gas from the combustion chamber.
- the present invention has been made in view of such a situation, and a cylinder head portion
- the objective is to provide a 4-cycle internal combustion engine that can further improve fuel efficiency and reduce nitrogen oxides (NOx) without complicating the structure of the minute.
- the first to third inventions of the present application have the following features.
- the first feature of the first invention is that a combustion chamber 40, an intake passage (intake port) 21 that opens to the combustion chamber, an exhaust passage (exhaust port) 31 that opens to the combustion chamber, and the intake
- a four-cycle internal combustion engine (engine) 10 having an intake valve 22 for opening and closing a combustion chamber side opening of an air passage and an exhaust valve 32 for opening and closing a combustion chamber side opening of the exhaust passage,
- a gas storage chamber 100 for storing the burnt gas G discharged from the combustion chamber, and the burnt gas is transferred to the gas while the exhaust valve is open during an expansion stroke or an exhaust stroke.
- the gist of the present invention is that it flows into the storage chamber and the exhaust valve is opened during the intake stroke, while the burned gas is stored in the gas storage chamber and discharged into the combustion chamber.
- the amount of internal EGR can be made larger than before, so that the bombing loss is reduced.
- a gas storage chamber that communicates with the exhaust passage and stores the combustion gas that is discharged from the combustion chamber. Therefore, a dedicated intake / exhaust communication that communicates with the gas storage chamber is provided. It is not necessary to provide a passage and a valve.
- a second feature of the first invention of the present application relates to the first feature, wherein when the exhaust valve is opened in the expansion stroke, the burned gas flows into the gas storage chamber, and The gist is that the burned gas is discharged into the combustion chamber while the exhaust valve is opened during the intake stroke.
- a third feature of the first invention of the present application relates to the first feature, wherein a timing force at which the already burned gas is discharged into the combustion chamber, wherein the intake valve and the exhaust valve are opened.
- the gist is that it is within one burlap period.
- a fourth feature of the first invention of the present application relates to the first feature, wherein the exhaust valve has the exhaust feature.
- a valve portion 32a that opens and closes an opening of the air passage to the combustion chamber and a handle portion 32b that extends from the valve portion, the periphery of the valve portion in the exhaust passage to the gas storage chamber
- the gist of the present invention is to further include a gas communication passage (existing combustion gas guide pipe) 110 that communicates.
- a fifth feature of the first invention of the present application relates to the fourth feature, wherein an end portion 110e on the valve portion side of the gas communication passage is directed in a direction along the peripheral portion 40p of the combustion chamber. The gist of this is.
- a sixth feature of the first invention of the present application relates to the first feature, and includes a fresh air storage chamber 69 that communicates with the intake passage and stores fresh air flowing through the intake passage.
- a fresh air storage chamber 69 that communicates with the intake passage and stores fresh air flowing through the intake passage.
- a seventh feature of the first invention of the present application relates to the first feature, wherein a fresh air storage chamber 69 for storing fresh air flowing in the intake passage, and the fresh air storage chamber and the intake passage are provided.
- a first fresh air communication passage 70 communicating with a portion near the combustion chamber side opening, and fresh air flows into the fresh air storage chamber through the first fresh air communication passage due to pressure fluctuations in the intake passage, During the intake stroke, while the intake valve is opened, the fresh air stored in the fresh air storage chamber is sucked into the combustion chamber through the first fresh air communication passage. This is the gist.
- An eighth feature of the first invention of the present application relates to the seventh feature, comprising a second fresh air communication passage that communicates the fresh air storage chamber and the intake passage, and pressure fluctuations in the intake passage.
- a ninth feature of the first invention of the present application relates to the eighth feature, wherein the second fresh air communication passage communicates with a portion near the downstream side of the throttle valve of the intake passage.
- a tenth feature of the first invention of the present application relates to the sixth feature, wherein the gas communication passage that communicates the gas storage chamber and the vicinity of the opening on the combustion chamber side of the exhaust passage is provided around the combustion chamber.
- the gist is that they are arranged so as to face in the tangential direction.
- An eleventh feature of the first invention of the present application is according to the tenth feature, wherein the first fresh air communication passage that communicates the fresh air storage chamber and a portion near the combustion chamber side opening of the intake passage is The gist of the present invention is that they are arranged so as to be tangent to a concentric circle formed on the center side of the combustion chamber.
- a first feature of the second invention of the present application is a combustion chamber, an intake passage that opens to the combustion chamber, an exhaust passage that opens to the combustion chamber, and an intake air that opens and closes the combustion chamber side opening of the intake passage.
- a four-cycle internal combustion engine comprising a valve and an exhaust valve that opens and closes an opening on the combustion chamber side of the exhaust passage, wherein the intake passage communicates with the intake passage via a first fresh air communication passage 70.
- a fresh air storage chamber 69 for storing fresh air flowing through the combustion chamber. During the intake stroke, while the intake valve is open, the fresh air stored in the new air storage chamber 69 is The main point is inhalation.
- a second feature of the second invention of the present application relates to the first feature of the second invention, and comprises a second fresh air communication passage 71 that connects the fresh air storage chamber 69 and the intake passage, While the intake valve is closed, fresh air flows into the fresh air storage chamber 69 via the first and second fresh air communication passages 70 and 71, and the intake valve is opened during the intake stroke.
- the gist is that fresh air stored in the fresh air storage chamber 69 is sucked into the combustion chamber via the first fresh air communication passage 70.
- a third feature of the second invention of the present application relates to the second feature of the second invention, wherein the second fresh air communication passage communicates with a portion near the downstream side of the throttle valve 65 of the intake passage.
- the gist of this is
- the first feature of the third invention of the present application is that the combustion chamber, the intake passage opening to the combustion chamber, the exhaust passage opening to the combustion chamber, and the combustion chamber side opening of the intake passage are opened and closed.
- a four-cycle internal combustion engine comprising: an intake valve that opens, an exhaust valve that opens and closes a combustion chamber side opening of the exhaust passage; and a throttle valve that changes a passage area of the intake passage.
- a third fresh air communication passage is provided which communicates a portion near the downstream side of the throttle valve and a portion near the opening on the combustion chamber side, and the downstream end of the third fresh air communication passage is tangent to the inner periphery of the combustion chamber. It is arranged so that it is oriented in the direction.
- the first feature of the fourth invention of the present application is that a combustion chamber (combustion chamber 40), a combustion chamber forming portion (cylinder block 1 lsb and cylinder head 1 lsh) forming the combustion chamber, and the combustion In the room
- a four-cycle internal combustion engine for example, engine 11 having an exhaust valve (exhaust valve 32C) for opening and closing the combustion chamber side opening of the combustion chamber, wherein the combustion chamber forming portion communicates with the exhaust passage, and
- a gas storage chamber (gas storage chamber 120) is provided for storing the burnt gas discharged from the chamber, and the burnt gas is V in the expansion stroke or exhaust stroke, and the exhaust valve is opened.
- the burned gas that has flowed into the gas storage chamber in the meantime and has been stored in the gas storage chamber
- the gas storage chamber communicating with the exhaust passage is provided in the combustion chamber forming portion, the gas storage chamber is provided within four cycles compared to the case where the gas storage chamber is provided outside the combustion chamber forming portion.
- the compactness of the combustion engine can be achieved, and the assembly of the 4-cycle internal combustion engine becomes easy.
- a second feature of the fourth invention of the present application relates to the first feature of the fourth invention, wherein the gas storage chamber includes a gas storage portion (gas storage portion 120a) for storing the burned gas.
- a gas communication passage portion (gas communication passage portion 120c) communicating with the gas storage portion and the exhaust passage, and the combustion chamber forming portion is connected to the cylinder block (cylinder block l lsb) and the cylinder block.
- a cylinder head opening (opening 120b) that opens toward the center is formed, and the cylinder head opening is blocked by connecting the cylinder block and the cylinder head.
- a third feature of the fourth invention of the present application relates to the first feature of the fourth invention, wherein the gas storage chamber (gas storage chamber 140) is a gas storage section for storing the burned gas ( A gas storage part 140a) and a gas communication passage part (gas communication passage part 140c) communicating with the gas storage part and the exhaust passage, and the combustion chamber forming part includes a cylinder block (cylinder block 14sb) A cylinder head (cylindrical head 14sh) having a face (a face 14a) facing the cylinder block, and the gas reservoir is formed in the cylinder block, and the gas reservoir
- the cylinder block opening that opens toward the mating surface (open A gist is that the opening of the cylinder block is closed by forming the opening 140b) and connecting the cylinder block and the cylinder head.
- a fourth feature of the fourth invention of the present application relates to the first feature of the fourth invention, wherein the gas storage chamber (gas storage chamber 150) is a gas storage section for storing the burned gas ( A gas storage portion (150a) and a gas communication passage portion (gas communication passage portion 150d) communicating with the gas storage portion and the exhaust passage, and the combustion chamber forming portion includes a cylinder block (cylinder block 15sb) A cylinder head (cylindrical head 15sh) having a face (fitting, face 15a) facing the cylinder block, and the gas reservoir is formed in the cylinder head and the cylinder block.
- the gas storage part formed in the cylinder head is formed with a cylinder head opening (cylinder head opening 150b) that opens toward the mating surface
- the gas storage part formed in the cylinder block Is formed with a cylinder block opening (cylinder block opening 150c) that opens toward one head of the cylinder, and the cylinder head and the cylinder block opening communicate with each other by connecting the cylinder head and the cylinder block.
- the gist is to do.
- a fifth feature of the fourth invention of the present application relates to the second to fourth features of the fourth invention, wherein the exhaust passage is formed in the cylinder head, and the gas communication passage portion is The gist of the invention is that it is formed between the exhaust passage and the mating surface.
- a sixth feature of the fourth invention of the present application relates to the second to fourth features of the fourth invention, wherein the combustion chamber is substantially circular in plan view and is located on the exhaust passage side.
- the gist of the invention is that at least a part of the gas communication passage portion is directed in a predetermined rotation direction (counterclockwise direction) along the peripheral portion (peripheral portion 40p) of the combustion chamber.
- a seventh feature of the fourth invention of the present application relates to the second to fourth features of the fourth invention, wherein at least a part of the gas communication passage portion located on the exhaust passage side is the exhaust gas.
- the gist is that it is along the passage.
- An eighth feature of the fourth invention of the present application relates to the first feature of the fourth invention, wherein the exhaust passage is curved in plan view of the combustion chamber forming portion, and the gas storage chamber At least a portion of the combustion chamber forming portion is inwardly of the curved exhaust passage in plan view. The main point is that it is provided in the region (region Al).
- a ninth feature of the fourth invention of the present application relates to the first feature of the fourth invention, and is summarized in that the gas storage chamber is provided in an outer portion of the combustion chamber forming portion.
- a tenth feature of the fourth invention of the present application relates to the ninth feature of the fourth invention, and is characterized in that the gas storage chamber projects the outer partial force.
- An eleventh feature of the fourth invention of the present application relates to the tenth feature of the fourth invention, wherein the gas storage chamber includes a base portion (base portion 13a) provided in the outer portion, and the base portion. Closing lid (lid 1
- gas storage part 130a in which the burned gas is stored is formed inside the base.
- a twelfth feature of the fourth invention of the present application relates to the tenth feature of the fourth invention, wherein a gas reservoir (gas reservoir) in which the burned gas is stored inside the lid portion.
- a gas reservoir gas reservoir in which the burned gas is stored inside the lid portion.
- the summary is that 130a) is formed.
- a thirteenth feature of the fourth invention of the present application relates to the twelfth feature of the fourth invention, and is summarized in that the gas storage chamber has a rectangular parallelepiped shape.
- a four-cycle internal combustion engine that can improve the fuel consumption and reduce nitrogen oxides (NOx) without complicating the structure of the cylinder head portion. be able to.
- FIG. 1 is a schematic configuration diagram of a four-cycle internal combustion engine according to a first embodiment of the present invention.
- FIG. 2 is a cross-sectional view of a cylinder head portion of the four-cycle internal combustion engine according to the first embodiment of the present invention.
- FIG. 3 is an arrow view from the direction F3 shown in FIG.
- FIG. 4 is an enlarged view of the vicinity of the exhaust port including the end of the burnt gas guide pipe shown in FIG.
- FIG. 5 is a partially enlarged sectional view of the four-cycle internal combustion engine according to the first embodiment of the present invention.
- FIG. 6 includes a gas storage chamber and a burnt gas guide pipe according to the first embodiment of the present invention. It is an enlarged view of a combustion chamber.
- Fig. 7 is a diagram showing the timing of inflow of burnt gas into the gas storage chamber and discharge of burnt gas (EGR gas) from the gas storage chamber according to the first embodiment of the present invention. .
- FIG. 8 is a graph showing the relationship between the capacity of the gas storage chamber according to the first embodiment of the present invention and nitrogen oxides (NOx).
- FIG. 9 is a graph showing the relationship between the capacity of the gas storage chamber and the fuel consumption rate according to the first embodiment of the present invention.
- FIG. 10 is a graph showing the relationship between the capacity of the gas storage chamber and the opening of the throttle (throttle valve) according to the first embodiment of the present invention.
- FIG. 11 is a graph showing the relationship between the capacity of the gas storage chamber according to the first embodiment of the present invention and hydrocarbon gas (HC).
- FIG. 12 is a schematic configuration diagram of a four-cycle internal combustion engine according to a second embodiment of the present invention.
- FIG. 13 is a diagram for explaining the introduction timing of exhaust gas and fresh air in the second embodiment of the present invention.
- FIG. 14 is a diagram for explaining the fuel efficiency improvement effect in various embodiments according to the present invention.
- FIG. 15 is a diagram showing a modification of the second embodiment of the present invention.
- FIG. 16 is a diagram showing another modification of the second embodiment of the present invention.
- FIG. 17 is a partially enlarged cross-sectional view of a four-cycle internal combustion engine according to a third embodiment of the present invention.
- FIG. 18 is a partial schematic perspective view of a four-cycle internal combustion engine according to a fourth embodiment of the present invention.
- FIG. 19 is a bottom view of the cylinder head of F19 direction force shown in FIG.
- FIG. 20 is a partially enlarged cross-sectional view of a four-cycle internal combustion engine according to a modification of the third embodiment of the present invention.
- FIG. 21 is a partially enlarged cross-sectional view of a four-cycle internal combustion engine according to a modification of the third embodiment of the present invention.
- FIG. 1 shows a schematic configuration of an engine 10 that is a four-cycle internal combustion engine according to the present embodiment. Specifically, FIG. 1 is a side view of the engine 10 showing a section of the cylinder head lOsh as a cross section.
- the engine 10 includes an intake port 21 and an exhaust port 31.
- the intake port 21 constitutes a portion of the intake passage in the cylinder head and opens to the combustion chamber 40.
- the exhaust port 31 constitutes a portion of the exhaust passage in the cylinder head and opens to the combustion chamber.
- the intake port 21 is provided with an intake valve 22.
- the exhaust port 31 is provided with an exhaust valve 32.
- the intake valve 22 is reciprocated at a predetermined timing by an intake-side camshaft 23 disposed in the upper part of the cylinder head 10sh.
- the intake port 21 opens and closes the combustion chamber side opening (the valve seat 24 portion shown in FIG. 2).
- the exhaust valve 32 is reciprocated at a predetermined timing by an exhaust side camshaft 33 disposed in the upper part of the cylinder head 10sh.
- the exhaust valve 32 When the exhaust valve 32 is reciprocated by the exhaust camshaft 33, it opens and closes the combustion chamber side opening of the exhaust port 31 (the valve seat 34 portion shown in FIG. 2).
- a cylinder 51 is formed below the cylinder head 10sh. Cylinder 51 Inside, a piston 52 for rotating a crankshaft (not shown) via a connecting rod 53 is arranged.
- FIG. 2 is a cross-sectional view of the cylinder head lOsh portion, specifically, a cross-sectional view of the cylinder head lOsh portion along a direction orthogonal to the intake side camshaft 23 and the exhaust side camshaft 33.
- FIG. 3 is an arrow view from the direction F3 shown in FIG.
- the intake valve 22 has an opening to the combustion chamber 40 (see FIG. 1) of the intake port 21, specifically, a valve portion that opens and closes a portion of the valve seat 24. 22a and a handle portion 22b that extends the force of the valve portion 22a.
- the exhaust valve 32 includes an opening portion of the exhaust port 31 to the combustion chamber 40 (see Fig. 1), specifically, a valve portion 32a for opening and closing a portion of the valve seat 34, and a valve portion 32a. And a handle portion 32b extending from.
- the exhaust port 31 is provided with a burnt gas induction pipe (gas communication path) 110 that communicates with the gas storage chamber 100 from the periphery of the valve portion 32a.
- a burnt gas induction pipe gas communication path
- the end portion 110e of the burnt gas guide pipe 110 closes the opening of the exhaust port 31 and secures a distance that does not interfere with the valve portion 32a when it is closed. In order to approach, it is provided on the exhaust side of the valve portion 32a.
- a gas storage chamber 100 that communicates with the exhaust port 31 and stores the already burned gas G (see FIG. 5) discharged from the combustion chamber 40.
- the burned gas G flows into the gas storage chamber 100 while the exhaust valve 32 is open during the expansion stroke or exhaust stroke of the engine 10. Further, the burnt gas G (EGR gas) stored in the gas storage chamber 100 is discharged into the combustion chamber 40 while the exhaust valve 32 is open in the intake stroke of the engine 10.
- EGR gas burnt gas G
- FIG. 4 is an enlarged view of the vicinity of the exhaust port 31 including the end portion 110e of the already burned gas guide pipe 110 shown in FIG.
- the end l lOe of the burnt gas guide pipe 110 has a slightly curved shape. Specifically, the end l lOe is directed in the direction along the peripheral portion 40p of the combustion chamber 40 (see FIG. 6).
- FIG. 5 is a partially enlarged cross-sectional view of the engine 10.
- the burnt combustion gas G stored in the gas storage chamber 100 is discharged into the combustion chamber 40 while the exhaust valve 32 is open during the intake stroke of the engine 10.
- FIG. 6 is an enlarged view of the combustion chamber 40 including the gas storage chamber 100 and the already burned gas guide pipe 110. Specifically, FIG. 6 is a diagram showing the combustion chamber 40 including the gas storage chamber 100 and the already burned gas guide pipe 110 from the F6 direction shown in FIG.
- the end portion 110 e of the already burned gas guide pipe 110 provided in the exhaust port 31 has a slightly curved shape.
- the end l lOe is the circumference of the combustion chamber 40
- the end l lOe is oriented in a direction along the upper surface of the piston 52, that is, in a substantially horizontal direction.
- the burnt gas G (EGR gas) stored at 0 can be swirled and discharged to the peripheral portion 40p.
- the burnt gas G EGR gas
- the unburned gas of Quenchia QA is evaporated by the hot burned gas G (EGR gas).
- the Quenchia QA is filled with the burned gas G (EGR gas), which prevents the unburned gas from flowing into the Quenchia QA.
- the inner diameter of the burnt gas guide tube 110 is set to 2.2 to 2.5 mm. It should be noted that the inner diameter and length of the burned gas guide pipe 110 and the capacity of the gas storage chamber 100 are preferably changed according to the exhaust amount of the engine 10 and the like.
- FIG. 7 shows the timing of the inflow of the burnt gas G into the gas storage chamber 100 and the discharge of the burnt gas G (EGR gas) from the gas storage chamber 100.
- EGR gas burnt gas
- the opening of the exhaust valve 32 corresponding to the crankshaft angle is shown.
- the dotted line “IN” indicates the opening of the intake valve 22 according to the crankshaft angle! /
- the solid line “inflow” indicates the capacity of the already burned gas G flowing into the gas storage chamber 100 and the inflow timing.
- the solid line “exhaust” is the burnt gas G discharged from the gas storage chamber G
- the burnt gas G is discharged from the exhaust valve 32 while the piston 52 is pushed down in the direction of the crankshaft (not shown) by the expansion stroke of the engine 10, that is, the expansion of the combustion gas.
- the gas flows into the gas storage chamber 100 at the time when is opened.
- the burned gas G stored in the gas storage chamber 100 opens the exhaust valve 32 during the intake stroke of the engine 10, that is, while the air-fuel mixture flows from the intake port 21 into the combustion chamber 40. Then, it is discharged into the combustion chamber 40 at the same timing.
- the timing at which the burnt gas G (EGR gas) is discharged into the combustion chamber 40 is set in the vicinity of the timing at which the exhaust nozzle 32 is closed.
- the data shown in 11 is measured under the following conditions.
- FIG. 8 is a graph showing the relationship between the capacity of the gas storage chamber 100 and nitrogen oxides (NOx). As shown in Fig. 8, when the capacity of the gas storage chamber 100 is extremely small (Pl l, about 0 cc in the figure) and when the capacity of the gas storage chamber 100 is about 65 cc (P12 in the figure) NOx is reduced by about 15%.
- the gas storage chamber 100 that communicates with the exhaust port 31 and stores the burned gas G that is discharged from the combustion chamber 40 is provided, so that it communicates with the gas storage chamber 100. There is no need to provide dedicated intake / exhaust ports and valves.
- nitrogen oxide (NOx) can be reduced without complicating the structure of the cylinder head 10sh portion.
- An internal combustion engine can be provided.
- FIG. 9 is a graph showing the relationship between the capacity of the gas storage chamber 100 and the fuel consumption rate. As shown in Fig. 9, when the capacity of the gas storage chamber 100 is extremely small (P21 in the figure, about Occ) and when the capacity of the gas storage chamber 100 is about 45cc (P22 in the figure), The fuel consumption rate has improved by about 10%.
- FIG. 10 is a graph showing the relationship between the capacity of the gas storage chamber 100 and the opening of the throttle (throttle valve).
- the already burned gas G (EGR gas) is discharged (recirculated) into the combustion chamber 40 during the intake stroke, so that The EGR amount can be made larger than before.
- the throttle valve of the engine 10 can be set to the open side, and the fuel efficiency can be improved.
- FIG. 11 is a graph showing the relationship between the capacity of the gas storage chamber 100 and hydrocarbon gas (HC). As shown in Fig. 11, when the capacity of the gas storage chamber 100 is extremely small (P31 in the figure, about Occ) and when the capacity of the gas storage chamber 100 is about 30cc (P32 in the figure), HC Decreased by about 7%.
- Quencheria QA is a force that generates a lot of HC. End of combustion gas guide pipe 110 End 110e Because it is oriented in the direction along the circumferential portion 40p of the combustion chamber 40, the already burned gas G (EGR gas) stored in the gas storage chamber 100 can be discharged into the circumferential portion 40p in a swirl shape. . That is, in the engine 10, the unburned gas of Quenchia QA is reduced by the EGR gas, so that the amount of HC generated can be suppressed.
- EGR gas already burned gas G
- the EGR rate (a numerical value obtained by expressing the amount of EGR gas recirculated to the combustion chamber 40 by the intake air amount) can be improved, and further improvement in fuel consumption rate and purification of exhaust gas can be achieved. be able to.
- the inner diameter, the tube length, and the capacity of the gas storage chamber 100 of the burned gas guide tube 110 can be adjusted according to the displacement of the engine 10 and the like. For this reason, the timing for discharging the burnt gas G (EGR gas) to the combustion chamber 40 according to the characteristics of the engine 10 and the like can be easily set in an appropriate rotational speed region.
- EGR gas burnt gas G
- the burned gas G flows into the gas storage chamber 100 at the timing when the exhaust valve 32 is opened in the expansion stroke of the engine 10, and the engine 10
- the combustion gas G EGR gas
- the timing of inflow and discharge of the combustion gas G is assumed. Is not necessarily limited to the timing.
- the force burned gas guide pipe 110 configured such that the end portion 110e of the burned gas guide pipe 110 is positioned around the valve portion 32a is not necessarily provided. It doesn't matter.
- the burnt gas guide pipe 110 may be configured to terminate at the position PV shown in FIG. 4, that is, the inner wall surface of the exhaust port 31, for example.
- FIGS. 12 and 13 are diagrams for explaining the second embodiment of the present invention.
- This second embodiment The state is an example in which a fresh air storage chamber 69 is provided in addition to the gas storage chamber 67 similar to the first embodiment.
- the fresh air includes both the case of air alone and the case of a mixture of air and fuel.
- the engine in the second embodiment is a four-cycle single-cylinder four-valve engine provided with two intake valves and two exhaust valves for each cylinder.
- the engine has a general structure in which a cylinder block, a cylinder head, and a head cover are laminated and fastened on an upper wall of a crankcase.
- the cylinder block side facing surface 61a of the cylinder head 61 is provided with a combustion recess 61b that constitutes the top wall of the combustion chamber.
- a combustion recess 61b In the combustion recess 61b, two intake port openings 62a and 62b and two exhaust port openings 63a and 63b are formed. These intake port opening and exhaust port opening are opened and closed by an intake valve and an exhaust valve, respectively.
- the ignition plug 73 is disposed at substantially the center of the combustion recess 61b.
- the intake port openings 62a and 62b are connected to branch intake ports 62c and 62d that constitute a portion of the intake passage in the cylinder head. These two branch intake ports 62c and 62d also branch a common main intake port 62e force that constitutes the cylinder head inner portion of the intake passage.
- the external connection port of the main intake port 62e is connected to an intake pipe 64 that forms the cylinder head outer portion of the intake passage.
- the intake pipe 64 is provided with a throttle valve 65 for controlling the intake passage area.
- Branch exhaust ports 63c and 63d constituting the inner part of the exhaust passage in the cylinder head are connected to the exhaust port openings 63a and 63b.
- the two branch exhaust ports 63c and 63d are joined to one common main exhaust port 63e that also constitutes an inner portion of the exhaust passage in the cylinder head.
- An exhaust pipe 66 constituting the outer part of the cylinder head of the exhaust passage is connected to the external connection port of the main exhaust port 63e.
- a sealed box-like gas storage chamber 67 similar to the gas storage chamber 100 in the first embodiment is disposed outside the exhaust side of the cylinder head 61.
- One end 68a of a burnt gas induction passage (gas communication passage) 68 is connected to the gas storage chamber 67 so as to communicate with the gas storage chamber.
- the other end 68b of the gas communication path 68 is connected so as to communicate with the downstream vicinity of the exhaust port opening 63b of the one branch exhaust port 63d.
- the other end 68b of the gas communication path 68 is formed so as to face the combustion chamber via the exhaust port opening 63b and to face the tangential direction with respect to the inner periphery of the combustion chamber.
- the axial direction and arrangement position of the gas communication passage 68 are such that the exhaust gas stored in the gas storage chamber 67 is sucked into the combustion chamber while forming a swirl flow (lateral vortex) along the inner periphery of the combustion chamber.
- a piston 67a is disposed in the gas storage chamber 67 so as to be able to advance and retract.
- the piston 67a is driven back and forth by an actuator 67b.
- the volume of the gas storage chamber 67 can be freely changed.
- a fresh air storage chamber 69 having a sealed box shape similar to that of the gas storage chamber 67 is disposed outside the intake side of the cylinder head 61.
- One end 70a of the first fresh air communication path 70 is connected to the fresh air storage chamber 69 so as to communicate with the fresh air storage chamber 69.
- the other end 70b of the first fresh air communication path 70 is connected so as to communicate with the vicinity of the upstream side of the intake port opening 62a of one branch intake port 62c.
- the other end 70b of the first fresh air communication passage 70 faces the concentric circle H formed near the center of the combustion chamber so as to face the combustion chamber via the intake port opening 62a. It is formed as follows. In other words, the axial direction and the position of the first fresh air communication passage 70 are such that fresh air stored in the fresh air storage chamber 69 becomes a swirl flow (lateral vortex) near the center of the combustion chamber and sucked into the combustion chamber. It is set to be
- the swirl flow by the exhaust gas discharged from the gas storage chamber 67 is formed near the outer periphery of the combustion chamber.
- a swirl flow due to fresh air discharged from the fresh air storage chamber 69 is formed closer to the spark plug 73 side.
- one end 71a of the second fresh air communication passage 71 is connected to the fresh air storage chamber 69 so as to communicate with the room.
- the other end 71b of the second fresh air communication passage 71 is located at the idling opening degree of the intake pipe 64, and communicates with a portion closest to the downstream side of the throttle valve 65! /.
- a piston 69a is disposed in the fresh air storage chamber 69 so as to freely advance and retract, and the piston 69a is driven forward and backward by an actuator 69b, so that the volume of the fresh air storage chamber 69 can be freely changed. It becomes. Then, the gas storage chamber volume control signal A and the fresh air storage chamber volume control signal B are input from the ECU 74 to the actuators 67b and 69b.
- the ECU 74 receives signals indicating engine operating conditions such as the engine speed a, throttle opening b, and engine temperature c.
- the EC U74 Based on these input signals a, b and c, the EC U74 obtains the optimal gas storage chamber volume and fresh air storage chamber volume, and sends control signals A and B for realizing these volumes to each of the actuators 67b, Output to 69b.
- the gas storage chamber 67 communicates with the downstream side of the exhaust port opening 63b of the branch exhaust port 63d by the gas communication path 68, so that the exhaust valve is near the end of the expansion stroke.
- a high blowdown pressure of the exhaust gas acts on the gas communication path 68, and the exhaust gas flows into the gas storage chamber 67 and is stored in the gas storage chamber 67 with a positive pressure.
- the piston starts to descend before closing the exhaust valve force S exhaust port opening 63b in the intake stroke.
- the pressure in the combustion chamber becomes negative, the exhaust gas stored in the gas storage chamber 67 is exhausted into the combustion chamber through the exhaust port opening 63b, as indicated by D in FIG.
- the gas communication path 68 is arranged so as to be substantially tangent to the inner periphery of the combustion chamber through the axial force exhaust port opening 63b, the exhaust gas from the gas storage chamber 67 is It is discharged in the tangential direction near the periphery of the combustion chamber. Therefore, a swirl flow of exhaust gas is formed near the periphery of the combustion chamber.
- the inside of the fresh air storage chamber 69 had a negative pressure during the previous intake stroke, and the first and second fresh air communication passages 70 and 71 are located near the intake port opening of the intake passage and near the downstream side of the throttle valve. Because of the communication, when the intake valve closes the intake port opening due to the end of the intake stroke, fresh air is stored in the new air storage chamber 69.
- the first fresh air communication passage 70 is arranged so that its axis is substantially tangent to a concentric circle H formed near the ignition plug 73 side of the combustion chamber through the intake port opening 62a. Therefore, fresh air from the fresh air storage chamber 69 is sucked in a tangential direction near the center of the combustion chamber, and a fresh swirl flow is formed near the center of the combustion chamber.
- Both the gas storage chamber 67 and the fresh air storage chamber 69 are provided. However, in this case, the fresh air storage chamber 69 and the intake passage communicate with each other only through the first fresh air communication passage 70.
- a gas storage chamber 67 is provided on the exhaust side, while a fresh air storage chamber 69 is not provided on the intake side, and the portion near the throttle valve downstream of the intake passage and the intake port The vicinity of the opening communicates directly with the third fresh air passage 72.
- the upstream end portion 72a of the third fresh air communication passage 72 is connected to the vicinity of the throttle valve downstream, the downstream end portion 72b is connected to the vicinity of the intake port opening, and the downstream end portion 72b is newly located near the center of the combustion chamber.
- the axial direction and the arrangement position are set so that a swirl flow of Qi is formed. More specifically, the downstream end portion 72b is disposed so as to face the tangential direction with respect to the inner periphery of the combustion chamber.
- FIG. 14 shows the experimental results for explaining the fuel efficiency improvement effect in cases (1) to (6).
- the gas storage chamber and fresh air storage of the fuel consumption rate when driving at a speed of 30, 50, 70 km / h on a motorcycle with an engine displacement of 125 cc, a gas storage chamber volume of 30 cc, and a fresh air storage chamber volume of 3 Occ The improvement effect with respect to the comparative vehicle which is not equipped with any of the rooms was investigated.
- the experimental results are shown only when traveling at 30 km / h.
- FIG. 16 is a schematic configuration diagram of a four-cycle internal combustion engine according to another modification of the second embodiment of the present invention.
- the four-cycle internal combustion engine includes a combustion chamber 40 that is substantially circular in a plan view, an intake pipe 64 through which fresh air taken into the combustion chamber 40 flows, and a combustion chamber 40 And an exhaust pipe 66 through which gas exhausted from the inside flows.
- the intake pipe 64 has a branch intake port 62d and a branch intake port 62d that open to the combustion chamber 40.
- the exhaust pipe 66 has a branch exhaust port 63 c and a branch exhaust port 63 d that open to the combustion chamber 40.
- the four-cycle internal combustion engine includes a gas storage chamber 67C and a fresh air storage chamber 69C.
- the gas storage chamber 67C includes a gas storage portion 67d that stores the burnt gas, and a gas communication path 68c that connects the gas storage portion 67d and the exhaust pipe 66 (branch exhaust port 63c).
- the fresh air storage chamber 69C has a fresh air storage portion 69d that stores fresh air, and a fresh air communication passage 70c that communicates the fresh air storage portion 69d and the intake pipe 64 (branch intake port 62d).
- the burnt gas in the combustion chamber 40 flows into the gas storage section 67d of the gas storage chamber 67C during the expansion stroke or exhaust process while the exhaust valve is open.
- the already burned gas stored in the gas storage portion 67d of the gas storage chamber 67C is discharged into the combustion chamber 40 while the exhaust valve is opened during the intake process.
- the fresh air stored in the fresh air storage portion 69d of the fresh air storage chamber 69C is sucked into the combustion chamber 40 while the intake valve is open in the intake process.
- At least a part of the gas communication path 68c located on the exhaust pipe 66 (branch exhaust port 63c) side faces a predetermined rotation direction (counterclockwise direction) along the peripheral portion 40p of the combustion chamber 40. Further, at least a part of the gas communication path 68c located on the exhaust pipe 66 (branch exhaust port 63c) side is along the exhaust pipe 66 (branch exhaust port 63c).
- At least part of the fresh air communication passage 70c located on the intake pipe 64 (branch intake port 62d) side is a predetermined rotational direction (counterclockwise direction) along a concentric circle H formed near the center of the combustion chamber 40. ) Further, at least a part of the fresh air communication passage 70c located on the intake pipe 64 (branch intake port 62d) side is along the intake pipe 64 (branch intake port 62d).
- a part of the fresh air communication passage 70c located on the intake pipe 64 (branch intake port 62d) side is directed to a part of the gas communication passage 68c located on the exhaust pipe 66 (branch exhaust port 63c) side.
- both directions may be clockwise.
- the exhaust pipe 66 is curved in plan view of the combustion chamber forming portion (cylinder block and cylinder head), and at least a part of the gas storage chamber 67C is curved in plan view of the combustion chamber forming portion. It is provided in a region (region A1) inside the exhaust pipe 66.
- the intake pipe 64 is curved in plan view of the combustion chamber forming portion (cylinder block and cylinder head). At least a part of the fresh air storage chamber 69C is provided in a region (region B1) inside the curved intake pipe 64 in a plan view of the combustion chamber forming portion.
- At least a part of the gas communication path 68c located on the exhaust pipe 66 (branch exhaust port 63c) side has a predetermined rotational direction along the peripheral portion 40p of the combustion chamber 40. Since the gas storage chamber 67C force is also directed to the (counterclockwise direction), swirl flow along the peripheral portion 40p of the combustion chamber 40 can be generated by the already burned gas discharged into the combustion chamber 40.
- the direction of a part of the fresh air communication passage 70c located on the branch intake port 62d side is the same as the direction of a part of the gas communication passage 68c located on the branch exhaust port 63c side.
- a swirl flow along the concentric circle H and the circumference 40p can be generated efficiently.
- the gas storage chamber that stores the already burned gas is provided outside the combustion chamber forming portion (cylinder block and cylinder head) that forms the combustion chamber.
- the gas storage chamber that stores the already burned gas is provided in the combustion chamber forming portion (cylinder block and cylinder head) that forms the combustion chamber.
- FIG. 17 is a schematic configuration diagram showing a four-cycle internal combustion engine according to the third embodiment of the present invention.
- the four-cycle internal combustion engine (engine 11) has a combustion chamber 40, a cylinder block l lsb that houses the piston 52 C, and a mating surface 1 la that faces the cylinder block l lsb.
- An air valve 22C and an exhaust valve 32C that opens and closes the combustion chamber side opening of the exhaust port 31C are provided.
- the intake port 21C and the exhaust port 31C are formed in the cylinder head l lsh.
- Combustion chamber 40 is formed by connecting cylinder block l lsb and cylinder head l lsh with gasket 12 interposed therebetween. That is, the cylinder head l lsh and the cylinder block 1 lsb are combustion chamber forming portions that form the combustion chamber 40.
- the engine 11 includes a gas storage chamber 120.
- the gas storage chamber 120 includes a gas storage part 120a that stores the burned gas, and a gas communication path part 120c that communicates the gas storage part 120a and the exhaust port 31C.
- the gas storage part 120a and the gas communication path part 120c are formed in the cylinder head llsh, and the gas communication path part 120c is formed between the exhaust port 31C and the mating surface 11a.
- the gas reservoir 120a has an opening 120b (cylinder head opening) that opens toward the mating surface 11a.
- the opening 120b is closed by connecting the cylinder block l lsb and the cylinder head l lsh with the gasket 12 interposed therebetween.
- the already burned gas flows into the gas storage chamber 120 (gas storage section 120a) during the expansion stroke or exhaust stroke, while the exhaust valve 32C is opened.
- the already burned gas stored in the gas storage chamber 120 (gas storage section 120a) is discharged into the combustion chamber 40 while the exhaust valve 32C is open in the intake stroke.
- fresh air storage chamber 69C fresh air storage chamber
- combustion chamber forming portion cylinder block 1 lsb and cylinder head 1 lsh
- the gas storage chamber 120 is provided in the combustion chamber forming portion (cylinder block l lsb and cylinder head l lsh). Compared to the case where the gas storage chamber 100 is provided outside the combustion chamber forming portion, the engine 11 can be made more compact and the engine 11 can be easily laid up.
- the gas The reservoir 120a is formed in the cylinder head l lsh and has an opening 120b that opens toward the mating surface 11a.
- the opening 120b is closed by connecting the cylinder block l lsb and the cylinder head l lsh with the gasket 12 interposed therebetween. Therefore, even if the gas reservoir 120a is not formed by cutting, the gas reservoir 120a can be formed by forging, and the cylinder head llsh can be easily processed.
- the gas communication passage 120c is formed between the exhaust port 31C and the mating surface 11a.
- the gas storage section 120a and the gas communication path section 120c can be formed by effectively utilizing the limited space of the cylinder head 11 sh.
- the gas storage chamber for storing the already burned gas is provided in the outer portion of the combustion chamber forming portion (cylinder block and cylinder head) forming the combustion chamber.
- FIG. 18 is a partial schematic perspective view of a four-cycle internal combustion engine (engine 13) according to a fourth embodiment of the present invention. Specifically, FIG. 18 is a schematic perspective view of a cylinder head 13 sh constituting the engine 13. FIG. 19 is a bottom view of the cylinder head 13sh from the F19 direction shown in FIG.
- the engine 13 is formed with an intake port 21D and an exhaust port 31D.
- intake port openings 21a and 21b that are opened and closed by an intake valve (not shown) are formed.
- the exhaust port 31D is formed with exhaust port openings 31a and 31b that are opened and closed by an exhaust valve (not shown).
- the cylinder head 13sh is formed with an attachment portion 13b used for attaching the cylinder head 13sh to the cylinder block of the engine 13.
- a gas storage chamber 130 is provided in an outer portion of the cylinder head 13sh (combustion chamber forming portion), specifically, in the exhaust port 31D.
- the outer partial force of the cylinder head 13sh also protrudes.
- the gas storage chamber 130 is a cylinder 13c (see Fig. 19). It projects toward the tangential direction.
- reference numeral 13c actually indicates the combustion chamber portion of the cylinder head 13sh that is overlapped with the cylinder (not shown).
- the gas storage chamber 130 includes a base portion 13a provided in an outer portion of the cylinder head 13sh and a lid portion 131 that closes the base portion 13a.
- the lid 131 is attached to the base 13a with a bolt (not shown).
- the gas storage chamber 130 has a rectangular parallelepiped shape. Specifically, in the gas storage chamber 130, the side 131a along the axis L1 of the cylinder (not shown) is longer than the side 131b orthogonal to the axis L1.
- the base 13a protrudes from the cylinder head 13sh and is formed integrally with the cylinder head 13sh. Inside the base portion 13a and the lid portion 131, a gas storage portion 130a in which the burned gas is stored is formed.
- the gas communication path 132 is joined to the base 13a.
- the already burned gas stored in the gas storage chamber 130 is exhausted to the exhaust port 31D through the gas communication path 132 (see the arrow shown in the portion of the gas communication path 132).
- the gas storage chamber 130 is provided in the outer portion of the cylinder head 13sh, and the gas storage chamber 130 is connected to the cylinder head 13sh. Outer part force also protrudes.
- the gas storage chamber has a rectangular parallelepiped shape, and the side 131a along the axis L1 of the cylinder (not shown) is longer than the side 133b perpendicular to the axis L1.
- a gas storage part 130a for storing the already burned gas is formed inside the base part 13a, and the base part 13a is closed by the lid part 131. For this reason, maintenance inside the gas storage part 130a is easy.
- the gas reservoir 130a is also formed inside the lid 131. This Therefore, the capacity of the gas reservoir 130a can be easily increased by using the lid 131. Further, by changing the size of the lid 131, the capacity of the gas reservoir 130a can be easily changed.
- a four-cycle internal combustion engine may be realized by appropriately combining the characteristic portions of the above-described embodiments and modification examples.
- the exhaust passage (exhaust pipe 66) force is bent in a plan view of the combustion chamber forming portion (cylinder block and cylinder head). At least part of the force of the gas storage chamber (gas storage chamber 67C) is provided in a region (region A1) inside the curved exhaust passage (exhaust pipe 66) in a plan view of the combustion chamber forming portion.
- the gas storage chamber (gas storage chamber 120) may be provided in the combustion chamber forming portion (particularly, the cylinder head l lsh).
- the gas storage chamber is provided in the region A1 inside the curved exhaust passage, and the gas storage chamber is provided in the cylinder head.
- the gas storage chamber can be formed by effectively utilizing the limited space.
- the intake passage (intake pipe 64) is curved in a plan view of the combustion chamber forming portion (cylinder block and cylinder head).
- at least a part of the fresh air storage chamber (fresh air storage chamber 69C) is a region (region B1) inside the curved intake passage (intake pipe 64) in plan view of the combustion chamber forming portion.
- the fresh air storage chamber may be provided in the combustion chamber forming part (cylinder block l lsb and cylinder head l lsh).
- the gas reservoir 120a is formed in the cylinder head llsh and has a force having an opening 120b that opens toward the mating surface 11a. It is not necessary to have the opening 120b that opens toward the mating surface 11a.
- the shape of the gas reservoir can be changed as follows. 20 and 21 show a modification of the gas reservoir.
- FIG. 20 is a partially enlarged cross-sectional view of a cylinder head 14sh and a cylinder block 14sb according to a modification of the third embodiment.
- the gas storage chamber 140 is formed by a gas storage section 140a and a gas communication path section 140c.
- the gas reservoir 140a is formed in the cylinder block 14sb that is not connected to the cylinder head 14sh.
- the gas reservoir 140a is formed with an opening 140b (cylinder block opening) that opens toward the mating surface 14a.
- the opening 140b is blocked by connecting the cylinder block 14sb and the cylinder head 14sh.
- FIG. 21 is a partially enlarged cross-sectional view of a cylinder head 15sh and a cylinder block 15sb according to another modification of the third embodiment.
- the gas storage chamber 150 is formed by a gas storage portion 150a and a gas communication passage portion 150d.
- the gas reservoir 150a is formed in the cylinder head 15sh and the cylinder block 15sb.
- a cylinder head opening 150b that opens toward the mating surface 15a is formed in the gas reservoir 150a formed on the cylinder block 15sb side.
- a cylinder block opening 150c that opens toward the cylinder head 15sh is formed in the gas reservoir 150a formed on the cylinder block 15sb side.
- the cylinder head opening 150b and the cylinder block opening 150c are connected by connecting the cylinder block 15sb and the cylinder head 15sh.
- the structure of the cylinder head portion is complicated. It is also useful for internal combustion engines such as engines because it can further improve fuel efficiency and reduce nitrogen oxides (NOx).
- NOx nitrogen oxides
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- Engineering & Computer Science (AREA)
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- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Exhaust-Gas Circulating Devices (AREA)
- Cylinder Crankcases Of Internal Combustion Engines (AREA)
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Description
Claims
Priority Applications (7)
Application Number | Priority Date | Filing Date | Title |
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AT07768362T ATE539255T1 (de) | 2006-07-25 | 2007-07-09 | Viertakt-verbrennungsmotor |
EP07768362A EP2071161B1 (en) | 2006-07-25 | 2007-07-09 | Four-cycle internal combustion engine |
CN2007800287315A CN101495736B (zh) | 2006-07-25 | 2007-07-09 | 四冲程内燃机 |
ES07768362T ES2376126T3 (es) | 2006-07-25 | 2007-07-09 | Motor de combustión interna de cuatro tiempos. |
BRPI0713326-0A BRPI0713326A2 (pt) | 2006-07-25 | 2007-07-09 | motor de combustão interna de quatro tempos |
TW096126225A TW200821461A (en) | 2006-07-25 | 2007-07-18 | Four-cycle internal combustion engine |
US12/359,862 US7980232B2 (en) | 2006-07-25 | 2009-01-26 | Four stroke internal combustion engine |
Applications Claiming Priority (4)
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JP2006202614 | 2006-07-25 | ||
JP2006-202614 | 2006-07-25 | ||
JP2007172933 | 2007-06-29 | ||
JP2007-172933 | 2007-06-29 |
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Application Number | Title | Priority Date | Filing Date |
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US12/359,862 Continuation-In-Part US7980232B2 (en) | 2006-07-25 | 2009-01-26 | Four stroke internal combustion engine |
Publications (1)
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WO2008013045A1 true WO2008013045A1 (fr) | 2008-01-31 |
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ID=38981359
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
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PCT/JP2007/063638 WO2008013045A1 (fr) | 2006-07-25 | 2007-07-09 | Moteur à combustion interne à quatre temps |
Country Status (8)
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US (1) | US7980232B2 (ja) |
EP (1) | EP2071161B1 (ja) |
CN (1) | CN101495736B (ja) |
AT (1) | ATE539255T1 (ja) |
BR (1) | BRPI0713326A2 (ja) |
ES (1) | ES2376126T3 (ja) |
TW (1) | TW200821461A (ja) |
WO (1) | WO2008013045A1 (ja) |
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2007
- 2007-07-09 CN CN2007800287315A patent/CN101495736B/zh not_active Expired - Fee Related
- 2007-07-09 ES ES07768362T patent/ES2376126T3/es active Active
- 2007-07-09 BR BRPI0713326-0A patent/BRPI0713326A2/pt not_active IP Right Cessation
- 2007-07-09 AT AT07768362T patent/ATE539255T1/de active
- 2007-07-09 WO PCT/JP2007/063638 patent/WO2008013045A1/ja active Application Filing
- 2007-07-09 EP EP07768362A patent/EP2071161B1/en not_active Not-in-force
- 2007-07-18 TW TW096126225A patent/TW200821461A/zh not_active IP Right Cessation
-
2009
- 2009-01-26 US US12/359,862 patent/US7980232B2/en not_active Expired - Fee Related
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Cited By (2)
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WO2010090044A1 (en) | 2009-02-09 | 2010-08-12 | Yamaha Hatsudoki Kabushiki Kaisha | Egr device for an engine |
US8500007B2 (en) | 2009-10-02 | 2013-08-06 | Giftcodes.Com, Llc | System and method for merchant interaction with and tracking of the secondary gift card marketplace |
Also Published As
Publication number | Publication date |
---|---|
BRPI0713326A2 (pt) | 2012-03-13 |
ATE539255T1 (de) | 2012-01-15 |
EP2071161A4 (en) | 2010-03-31 |
US7980232B2 (en) | 2011-07-19 |
CN101495736B (zh) | 2011-02-16 |
CN101495736A (zh) | 2009-07-29 |
TWI337642B (ja) | 2011-02-21 |
TW200821461A (en) | 2008-05-16 |
EP2071161B1 (en) | 2011-12-28 |
EP2071161A1 (en) | 2009-06-17 |
ES2376126T3 (es) | 2012-03-09 |
US20090205608A1 (en) | 2009-08-20 |
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