CN109751114A - The chamber structure of internal combustion engine - Google Patents
The chamber structure of internal combustion engine Download PDFInfo
- Publication number
- CN109751114A CN109751114A CN201811291051.9A CN201811291051A CN109751114A CN 109751114 A CN109751114 A CN 109751114A CN 201811291051 A CN201811291051 A CN 201811291051A CN 109751114 A CN109751114 A CN 109751114A
- Authority
- CN
- China
- Prior art keywords
- mentioned
- piston
- flat part
- peak potion
- air inlet
- 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
Links
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
- F02B23/00—Other engines characterised by special shape or construction of combustion chambers to improve operation
- F02B23/08—Other engines characterised by special shape or construction of combustion chambers to improve operation with positive ignition
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02F—CYLINDERS, PISTONS OR CASINGS, FOR COMBUSTION ENGINES; ARRANGEMENTS OF SEALINGS IN COMBUSTION ENGINES
- F02F1/00—Cylinders; Cylinder heads
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02F—CYLINDERS, PISTONS OR CASINGS, FOR COMBUSTION ENGINES; ARRANGEMENTS OF SEALINGS IN COMBUSTION ENGINES
- F02F3/00—Pistons
- F02F3/28—Other pistons with specially-shaped head
-
- 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
Landscapes
- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Combustion Methods Of Internal-Combustion Engines (AREA)
- Pistons, Piston Rings, And Cylinders (AREA)
Abstract
A kind of chamber structure of internal combustion engine is provided, there is valve recess portion, protrusion and bowl portion in the top surface of piston, can easily improve the flammability of gaseous mixture, and can easily reduce the cooling loss of burning gases.In the chamber structure of engine, comprising: air inlet side peak potion passes through air inlet side valve recess portion and piston intake side flat part；Exhaust side peak potion passes through exhaust side valve recess portion and piston exhaust side flat part；And the 1st linking peak potion and the 2nd linking peak potion, the end of its end for being connected air inlet side peak potion and exhaust side peak potion, and extend along the outer peripheral edge on the radial direction of the top surface of piston, the 1st bowl of portion, central axis recess of the 1st bowl of portion from protrusion towards piston are provided in the chamber structure of engine.
Description
Technical field
The present invention relates to the chamber structures of internal combustion engine.
Background technique
Propose a kind of technology for improving flame radiation by chamber structure in internal combustion engine.(referring to patent text
It offers 1).
The geometrical compression ratio of reciprocating engine documented by patent document 1 is 13.0 or more, in the upper surface shape of piston
At having protrusion and recess portion, when piston is located at top dead centre, regulation is formed between the upper surface of piston and the top surface of cylinder head
Gap, so that combustion chamber is formed, so that piston is not done with the imaginary sphere with predetermined radius centered on spark plug
It disturbs.
To which reciprocating engine documented by patent document 1 can improve geometrical compression ratio by protrusion, and lead to
The shape for crossing recess portion improves flame radiation, improves the fuel efficiency of reciprocating engine.
Existing technical literature
Patent document
Patent document 1: No. 5003496 bulletin of special permission
Summary of the invention
Problems to be solved by the invention
However, in previous reciprocating engine, during protrusion with the central axis (central axis of spark plug) of piston is
The heart is from the upper surface of piston big large protuberance upwards, therefore, in piston approaches top dead center, longitudinal turbulence and protrusion collide and
The flowing of air is set to decay, it is difficult to improve the Combination of fuel and air.
Moreover, the recess portion in the space and protrusion of valve recess portion (valve recess) is connected by flat space, therefore,
Gaseous mixture into valve recess portion is difficult to burn.Also, the surface area of combustion chamber increases, it is possible to will increase the cold of burning gases
But it loses.
The present invention has been made in view of the above-described circumstances, and an object thereof is to provide a kind of chamber structure of internal combustion engine,
The top surface of piston has valve recess portion, protrusion and bowl portion, can easily improve the flammability of gaseous mixture, and can hold
Changing places reduces the cooling loss of burning gases.
The solution to the problem
The present invention is a kind of chamber structure of internal combustion engine, have combustion chamber, above-mentioned combustion chamber by cylinder block, piston and
Cylinder head is formed, and above-mentioned cylinder block has cylinder, and above-mentioned piston is accommodated in above-mentioned cylinder and can move back and forth, above-mentioned cylinder head
It is assemblied in above-mentioned cylinder block, it is inclined ridge-roof type that above-mentioned cylinder head, which includes roof, as a result, a pair of of intake valve and a pair of of row
Air valve can be arranged to mutually tilt to opposite side；And bottom surface, extend with the orthogonality of center shaft of above-mentioned piston, on above-mentioned top
It is formed with press section between wall and the top surface of above-mentioned piston, protrusion is provided in the top surface of above-mentioned piston, surrounds bowl portion；
And a pair of of air inlet side valve recess portion and a pair of of exhaust side valve recess portion, it avoids and above-mentioned a pair of of intake valve and above-mentioned a pair of arranges
Air valve interferes, and the chamber structure of above-mentioned internal combustion engine is characterized in that, it is flat that above-mentioned press section includes cylinder head air inlet side
Portion, flat part, gentle head exhaust side, is set to above-mentioned roof, parallel with the bottom surface of above-mentioned cylinder head, and at least with above-mentioned one
Intake valve is compared with above-mentioned a pair of of exhaust valve and is located at outside；Piston intake side flat part, is set to the top surface of above-mentioned piston
And it is opposite with above-mentioned cylinder head air inlet side flat part, and its top end part is from the outer peripheral edge on the radial direction of the top surface of above-mentioned piston
It extends between above-mentioned a pair of of air inlet side valve recess portion；And piston exhaust side flat part, it is set to the top surface of above-mentioned piston
And it is opposite with above-mentioned cylinder head exhaust side flat part, and its top end part is from the outer peripheral edge on the radial direction of the top surface of above-mentioned piston
It extends between above-mentioned a pair of of exhaust side valve recess portion, above-mentioned protrusion is arranged in above-mentioned piston intake side flat part and above-mentioned piston
It is swelled between the flat part of gas side to the top of above-mentioned piston intake side flat part and above-mentioned piston exhaust side flat part, above-mentioned a pair
Air inlet side valve recess portion is formed from above-mentioned piston intake side flat part to above-mentioned protrusion, above-mentioned a pair of exhaust side valve recess portion from
Above-mentioned piston exhaust side flat part is formed to above-mentioned protrusion, and above-mentioned bowl portion is from above-mentioned protrusion towards the central axis of above-mentioned piston
It is recessed into dome shape, above-mentioned protrusion includes air inlet side peak potion, passes through above-mentioned a pair of of air inlet side valve recess portion and above-mentioned piston
Air inlet side flat part；Exhaust side peak potion passes through above-mentioned a pair of of exhaust side valve recess portion and above-mentioned piston exhaust side flat part；With
And the 1st linking peak potion and the 2nd linking peak potion, be connected the end of above-mentioned air inlet side peak potion and the end of above-mentioned exhaust side peak potion,
And extend along the outer peripheral edge on the radial direction of the top surface of above-mentioned piston, above-mentioned 1st linking peak potion and above-mentioned 2nd linking peak potion
It is located higher than the position of above-mentioned air inlet side peak potion and above-mentioned exhaust side peak potion, above-mentioned air inlet side peak potion is flat in above-mentioned piston intake side
Pass through above-mentioned piston near the position that smooth portion intersects in the short transverse of above-mentioned piston with above-mentioned a pair of of air inlet side valve recess portion
Air inlet side flat part, also, be connected with from above-mentioned piston intake side flat part towards above-mentioned 1st linking peak potion and the above-mentioned 2nd
Peak potion extends, and the height of above-mentioned air inlet side peak potion increases continuously, above-mentioned exhaust side peak potion above-mentioned piston exhaust side flat part with
Pass through above-mentioned piston exhaust side near the position that above-mentioned a pair of exhaust side valve recess portion intersects in the short transverse of above-mentioned piston
Flat part, also, prolong with from above-mentioned piston exhaust side flat part towards above-mentioned 1st linking peak potion and above-mentioned 2nd linking peak potion
It stretches, the height of above-mentioned exhaust side peak potion increases continuously.
Invention effect
In this way, there is valve recess portion, protrusion and bowl portion, Neng Gourong in the top surface of piston according to the above-mentioned present invention
It changes places and improves the flammability of gaseous mixture, and can easily reduce the cooling loss of burning gases.
Detailed description of the invention
Fig. 1 is the figure for showing the chamber structure of internal combustion engine of one embodiment of the invention, is the top view of cylinder head.
Fig. 2 is the figure for showing the chamber structure of internal combustion engine of one embodiment of the invention, is the roof for showing combustion chamber
Figure.
Fig. 3 be Fig. 1 the direction III-III to view sectional view.
Fig. 4 is the figure for showing the chamber structure of internal combustion engine of one embodiment of the invention, is the perspective view of piston.
Fig. 5 is the figure for showing the chamber structure of internal combustion engine of one embodiment of the invention, is the top view of piston.
Fig. 6 is the figure for showing the chamber structure of internal combustion engine of one embodiment of the invention, is the main view of piston.
Fig. 7 is the figure for showing the chamber structure of internal combustion engine of one embodiment of the invention, be Fig. 5 VII-VII direction to
Depending on sectional view.
Fig. 8 is the figure for showing the chamber structure of internal combustion engine of one embodiment of the invention, is that the air inlet side peak potion of Fig. 7 is attached
Close enlarged drawing.
Fig. 9 is the figure for showing the chamber structure of internal combustion engine of one embodiment of the invention, be Fig. 5 the direction IX-IX to
Depending on sectional view.
Figure 10 is the figure for showing the chamber structure of internal combustion engine of one embodiment of the invention, is to show piston to be located at upper stop
The figure of the positional relationship of spark plug and the 2nd bowl of portion in the case where point.
Figure 11 is the figure for showing the chamber structure of internal combustion engine of one embodiment of the invention, is to show piston to be located at upper stop
The figure of the flowing of the indoor gaseous mixture of burning in the case where point.
Description of symbols
1... engine (internal combustion engine), 2... cylinder head, 2R... roof, the bottom surface 2a... (bottom surface of cylinder head), 3...
Cylinder block, 4... cylinder, 5... piston, the top surface 5A... (top surface of piston), 5a... central axis (central axis of piston), 5b,
The outer peripheral edge 5c... (outer peripheral edge on the radial direction of the top surface of piston), the combustion chamber 6..., 7A, 7B... intake valve, 8A,
8B... exhaust valve, 11,12... press section, 13... cylinder head air inlet side flat part, 14... cylinder head exhaust side flat part,
15... piston intake side flat part, the top end part 15a... (top end part of piston intake side flat part), 16... piston exhaust side
Flat part, the top end part 16a... (top end part of piston exhaust side flat part), 17,18... air inlet side valve recess portion, 19,20...
Exhaust side valve recess portion, 21... protrusion, the 1st bowl of portion (bowl portion) of 22..., 23... air inlet side peak potion, the end 23a, 23b...
(end of air inlet side peak potion), 24... exhaust side peak potion, the end 24a, 24b... (end of exhaust side peak potion), 25... the 1st
It is connected peak potion, 26... the 2nd is connected peak potion, the 2nd bowl of portion 29..., 30... spark plug.
Specific embodiment
The chamber structure of the internal combustion engine of one embodiment of the present invention has combustion chamber, and combustion chamber is by cylinder block, piston
And cylinder head is formed, cylinder block has cylinder, and piston is accommodated in cylinder and can move back and forth, and cylinder head is assemblied in cylinder
Body, cylinder head include roof, are inclined ridge-roof type, and a pair of of intake valve and a pair of of exhaust valve can be arranged to mutually as a result,
It is tilted to opposite side；And bottom surface, extend with the orthogonality of center shaft of piston, is formed between roof and the top surface of piston crowded
Splenium is provided with protrusion in the top surface of piston, surrounds bowl portion；And a pair of of air inlet side valve recess portion and a pair of of exhaust side
Valve recess portion is avoided interfering with a pair of of intake valve and a pair of of exhaust valve, in the chamber structure of above-mentioned internal combustion engine, be squeezed
Splenium includes cylinder head air inlet side flat part gentle head exhaust side flat part, is set to roof, flat with the bottom surface of cylinder head
Row, and it is located at least in the outside of a pair of of intake valve and a pair of of exhaust valve；Piston intake side flat part, is set to the top surface of piston
And it is opposite with cylinder head air inlet side flat part, and its top end part extends to one from the outer peripheral edge on the radial direction of the top surface of piston
To between air inlet side valve recess portion；And piston exhaust side flat part, be set to the top surface of piston and with cylinder head exhaust side
Flat part is opposite, and its top end part extends to a pair of of exhaust side valve recess portion from the outer peripheral edge on the radial direction of the top surface of piston
Between, protrusion is arranged between piston intake side flat part and piston exhaust side flat part to piston intake side flat part and piston
The top of gas side flat part is swelled, and a pair of of air inlet side valve recess portion is formed from piston intake side flat part to protrusion, Yi Duipai
Gas side valve recess portion is formed from piston exhaust side flat part to protrusion, bowl portion from protrusion towards piston central axis recess at
Dome shape, protrusion include air inlet side peak potion, pass through a pair of of air inlet side valve recess portion and piston intake side flat part；Exhaust
Side peak potion passes through a pair of of exhaust side valve recess portion and piston exhaust side flat part；And the 1st linking peak potion and the 2nd linking peak
Portion is connected the end of air inlet side peak potion and the end of exhaust side peak potion, and along outer on the radial direction of the top surface of piston
Periphery extends, and the 1st linking peak potion and the 2nd is connected the position that peak potion is located higher than air inlet side peak potion and exhaust side peak potion, air inlet side
Peak potion is led near the position that piston intake side flat part intersects in the short transverse of piston with a pair of of air inlet side valve recess portion
It makes a living and fills in gas side flat part, also, prolong with from piston intake side flat part towards the 1st linking peak potion and the 2nd linking peak potion
It stretches, the height of air inlet side peak potion increases continuously, and exhaust side peak potion is in piston exhaust side flat part and a pair of of exhaust side valve recess portion
Pass through piston exhaust side flat part near the position intersected in the short transverse of piston, also, with flat from piston exhaust side
Smooth portion is connected peak potion towards the 1st and the 2nd linking peak potion extends, and the height of exhaust side peak potion increases continuously.
To have valve recess portion, protrusion and bowl portion in the top surface of piston, can easily improve the combustion of gaseous mixture
Burning property, and can easily reduce the cooling loss of burning gases.
[embodiment 1]
In the following, being illustrated using chamber structure of the attached drawing to the internal combustion engine of one embodiment of the invention.
Fig. 1 to Figure 11 is the figure for showing the chamber structure of internal combustion engine of one embodiment of the invention.
Firstly, illustrating to constitute.
In Fig. 1, Fig. 2, the engine 1 as internal combustion engine has cylinder head 2.A pair of of air inlet is formed in cylinder head 2
2b, 2c and a pair of of exhaust outlet 2d, 2e.
In Fig. 3, engine 1 has cylinder block 3, and the top of cylinder block 3 is provided with cylinder head 2.In cylinder block 3
Portion is formed with cylinder 4, cylinder 4 be internally provided with piston 5 and piston 5 can move back and forth.
Piston 5 is linked to crankshaft (not shown) through not shown connecting rod, and the reciprocating motion of piston 5 is converted to via connecting rod
The rotary motion of crankshaft.
Combuster 6 is formed in cylinder head 2 and cylinder block 3.Combustion chamber 6 is by being formed on the bottom surface 2a of cylinder head 2
The top surface 5A packet of air inlet side roof 2f and exhaust side roof 2g (referring to Fig. 2), the inner wall (cylinder chamber) of cylinder 4 and piston 5
The space enclosed is constituted.
In Fig. 1, a pair of of intake valve 7A, 7B and a pair of of exhaust valve 8A, 8B are provided in cylinder head 2.Intake valve 7A exists
Front end has umbrella portion 7a (referring to Fig. 2), and the rotation with admission cam (not shown) is synchronously opened and closed air inlet 2b by umbrella portion 7a.
Intake valve 7B has 7b (referring to Fig. 2) in front end, and the rotation with admission cam (not shown) is synchronously by umbrella portion 7b
It is opened and closed air inlet 2c.
Exhaust valve 8A has umbrella portion 8a (referring to Fig. 2) in front end, the rotation with exhaust cam (not shown) synchronously by
Umbrella portion 8a is opened and closed exhaust outlet 2d.
Exhaust valve 8B has umbrella portion 8b (referring to Fig. 2) in front end, the rotation with exhaust cam (not shown) synchronously by
Umbrella portion 8b is opened and closed exhaust outlet 2e.
The bottom surface 2a of cylinder head 2 has the plane of extension orthogonal with the central axis 5a of piston 5.
In Fig. 3, the central axis 5a of air inlet side roof 2f and exhaust side roof 2g from bottom surface 2a towards piston 5 inclines upwards
Tiltedly, intake valve 7A, 7B and exhaust valve 8A, 8B by mutually to opposite side it is inclined in a manner of be set to cylinder head 2.The present embodiment into
The roof 2R of gas side roof 2f and exhaust side roof 2g composition ridge (pentroof) type.
The portion extruding (squish) is formed between air inlet side roof 2f and exhaust side roof 2g and the top surface 5A of piston 5
11、12。
Press section 11,12 has 13 gentle head exhaust side flat part 14 of cylinder head air inlet side flat part, cylinder head air inlet
13 gentle head exhaust side flat part 14 of side flat part is set to air inlet side roof 2f and exhaust side roof 2g, with cylinder head 2
Bottom surface 2a is parallel, and is located at outside compared with intake valve 7A, 7B and exhaust valve 8A, 8B.
Press section 11,12 has piston intake side flat part 15 and piston exhaust side flat part 16, and piston intake side is flat
Portion 15 and piston exhaust side flat part 16 are set to the top surface 5A of piston 5, and with cylinder head air inlet side flat part 13 and cylinder head
Exhaust side flat part 14 is opposite.
Cylinder head air inlet side flat part 13 is formed as parallel plane, cylinder head exhaust side with piston intake side flat part 15
Flat part 14 is formed as parallel plane with piston exhaust side flat part 16.
In Fig. 4, Fig. 5, it is formed with a pair of of air inlet side valve recess portion 17,18 in the top surface 5A of piston 5, air inlet side valve is recessed
Portion 17,18 is recessed to the lower section of piston intake side flat part 15.Umbrella portion 7a, 7b and air inlet side valve recess portion is shown in FIG. 5
17, the positional relationship of 18 positional relationship and umbrella portion 8a, 8b and exhaust side valve recess portion 19,20.
Air inlet side valve recess portion 17,18 is formed in intake valve 7A, 7B and opens air inlet 2b, 2c and be moved to air inlet side roof
The relief portion interfered with intake valve 7A, 7B is avoided when the lower section of 2f.
A pair of of exhaust side valve recess portion 19,20 is formed in the top surface 5A of piston 5, and exhaust side valve recess portion 19,20 is to work
Fill in the lower section recess of exhaust side flat part 16.
Exhaust side valve recess portion 19,20 is formed in exhaust valve 8A, 8B and opens exhaust outlet 2d, 2e and be moved to exhaust side roof
The relief portion interfered with exhaust valve 8A, 8B is avoided when the lower section of 2g.
Piston intake side flat part 15 has top end part 15a, and top end part 15a is from the radial direction of the top surface 5A of piston 5
Outer peripheral edge 5b extend between air inlet side valve recess portion 17,18.
Piston exhaust side flat part 16 has top end part 16a, and top end part 16a is from the radial direction of the top surface 5A of piston 5
Outer peripheral edge 5c extend between exhaust side valve recess portion 19,20, outer peripheral edge 5c is located at across the central axis 5a of piston 5 and radius
Outer peripheral edge 5b on direction opposite side.
The top surface 5A of piston 5 is provided with protrusion 21.Protrusion 21 is vented in piston intake side flat part 15 and piston
It is swelled between side flat part 16 to the top of piston intake side flat part 15 and piston exhaust side flat part 16.
The 1st bowl of portion 22 is formed in the top surface 5A of the piston 5 surrounded by protrusion 21, and the bottom wall in the 1st bowl of portion 22 is from protuberance
The central axis 5a of portion 21 towards piston 5 is recessed into dome shape.The 1st bowl of portion 22 of the present embodiment constitutes bowl portion of the invention.
In the short transverse of piston 5, air inlet side valve recess portion 17,18 is formed from piston intake side flat part 15 to protuberance
Portion 21 is tilted from piston intake side flat part 15 towards protrusion 21 along the inclined direction of umbrella portion 7a, 7b upwards.
In the short transverse of piston 5, exhaust side valve recess portion 19,20 is formed from piston exhaust side flat part 16 to protuberance
Portion 21 is tilted from piston exhaust side flat part 16 towards protrusion 21 along the inclined direction of umbrella portion 8a, 8b upwards.
Protrusion 21 includes air inlet side peak potion 23, passes through air inlet side valve recess portion 17,18 and piston intake side flat part
15；And exhaust side peak potion 24, pass through exhaust side valve recess portion 19,20 and piston exhaust side flat part 16.
Protrusion 21 includes the 1st linking peak potion 25, is connected the end 23a and exhaust side peak potion 24 of air inlet side peak potion 23
End 24a, and along on the radial direction of the top surface 5A of piston 5 outer peripheral edge 5d extend；And the 2nd linking peak potion 26,
It is connected the end 23b of air inlet side peak potion 23 and the end 24b of exhaust side peak potion 24, and the radius side of the top surface 5A along piston 5
Upward outer peripheral edge 5e extends.
In Fig. 4, Fig. 5, protrusion 21 has inclined surface 23A (details referring to Fig. 8), and inclined surface 23A is from air inlet side peak potion
23 tilt towards air inlet side valve recess portion 17,18.As shown in figure 8, the upper end of the inclined direction of inclined surface 23A is from piston intake side
Flat part 15 erects upwards.
In Fig. 4, Fig. 5, protrusion 21 has inclined surface 24A, and inclined surface 24A is from exhaust side peak potion 24 towards exhaust side gas
Door recess portion 19,20 tilts.The upper end of the inclined direction of inclined surface 24A erects upwards from piston exhaust side flat part 16.
In Fig. 7, the 1st linking peak potion 25 is located higher than the position of air inlet side peak potion 23 and exhaust side peak potion 24.
In Fig. 6, the 2nd linking peak potion 26 is located higher than the position of air inlet side peak potion 23 and exhaust side peak potion 24.
In Fig. 4, Fig. 5, air inlet side peak potion 23 is in piston intake side flat part 15 and air inlet side valve recess portion 17,18 in work
The position 27 intersected in the short transverse of plug 5 is nearby by piston intake side flat part 15.
The position that piston intake side flat part 15 intersects in the short transverse of piston 5 with air inlet side valve recess portion 17,18
27 be piston intake side flat part 15 and air inlet side valve recess portion 17,18 continuous part in the up-down direction, is air inlet side gas
The outer circumference end of door recess portion 17,18.
Moreover, extend with peak potion 26 is connected towards the 1st linking peak potion 25 and the 2nd from piston intake side flat part 15, into
The height of gas side peak potion 23 increases continuously (referring to Fig. 9).
Exhaust side peak potion 24 is in piston exhaust side flat part 16 and exhaust side valve recess portion 19,20 in the height side of piston 5
The position 28 intersected upwards nearby passes through piston exhaust side flat part 16.
The position that piston exhaust side flat part 16 intersects in the short transverse of piston 5 with exhaust side valve recess portion 19,20
28 be piston exhaust side flat part 16 and exhaust side valve recess portion 19,20 continuous part in the up-down direction, is exhaust side gas
The outer circumference end of door recess portion 19,20.
Moreover, extending with peak potion 26 is connected towards the 1st linking peak potion 25 and the 2nd from piston exhaust side flat part 16, row
The height of gas side peak potion 24 increases continuously.
It is recessed thus, it is possible to form the central axis 5a from protrusion 21 towards piston 5 in the top surface 5A of piston 5 into dome shape
The 1st bowl of portion 22.
In contrast, if being connected with from piston intake side flat part 15 and piston exhaust side flat part 16 towards the 1st
Peak potion 25 and the 2nd is connected peak potion 26 and extends, and the height of air inlet side peak potion 23 and exhaust side peak potion 24 is continuously reduced respectively, then can not
The recess of the central axis 5a from protrusion 21 towards piston 5 is formed in a wider range at the 1st of dome shape in the top surface 5A of piston 5
Bowl portion 22.
In Fig. 2, interconnecting piece, that is, roof 2R central portion of air inlet side roof 2f and exhaust side roof 2g are provided with fire
Flower plug 30.
In Fig. 4, Fig. 5, the central portion in the 1st bowl of portion 22 is arranged in the 2nd bowl of portion 29.
In Fig. 9, the radius of curvature R 1 in the 1st bowl of portion 22 is formed as bigger than the radius of curvature R 2 in the 2nd bowl of portion 29, the 2nd bowl of portion
29, which are formed as radius, is greater than the 1st less than the radius and dome shape depth in the 1st bowl of portion 22 centered on the central axis 5a of piston 5
The dome shape depth in bowl portion 22.
In Figure 10, the 2nd bowl of portion 29 is formed in the top surface 5A of piston 5, and arranges in the up-down direction with spark plug 30.
Spark plug 30 receives the high-tension current that not shown ignition coil generates with central electrode 30a, in middle electrocardio
The gap of pole 30a and grounding electrode 30b generates spark.To light the gaseous mixture of the air and fuel that import in combustion chamber 6.
The distance L1 of the central part in the 2nd bowl of portion 29 to ignition location 30c are set to and central electrode 30aUpper end to point
The distance L2 approximately the same distance of fiery position 30c.
In the chamber structure of the engine 1 of the present embodiment, in air inlet side roof 2f and exhaust side roof 2g and piston 5
Top surface 5A between be formed with press section 11,12.Press section 11,12 has the gentle head exhaust in cylinder head air inlet side flat part 13
Side flat part 14,13 gentle head exhaust side flat part 14 of cylinder head air inlet side flat part is parallel with the bottom surface 2a of cylinder head 2, and
And on the outside of the radial direction of top surface 5A that compared with intake valve 7A, 7B and exhaust valve 8A, 8B piston 5 is set.
Press section 11 has piston intake side flat part 15, and piston intake side flat part 15 is set to the top surface 5A of piston 5
And it is opposite with cylinder head air inlet side flat part 13, and its top end part 15a is from the outer peripheral edge on the radial direction of the top surface 5A of piston 5
5b is extended between air inlet side valve recess portion 17,18.
Press section 12 has piston exhaust side flat part 16, and piston exhaust side flat part 16 is set to the top surface 5A of piston 5
And it is opposite with cylinder head exhaust side flat part 14, and its top end part 16a is from the outer peripheral edge on the radial direction of the top surface 5A of piston 5
5c is extended between exhaust side valve recess portion 19,20.
To which the air for importing combustion chamber 6 from air inlet 2b, 2c can be when piston 5 rises towards top dead centre due to squeezing
Splenium 11,12 and be oriented to the central axis 5a towards piston 5.
In addition, by the cylinder head air inlet side flat part 13 and piston intake side flat part parallel with the bottom surface 2a of cylinder head 2
15 constitute press section 11, flat by the cylinder head exhaust side flat part 14 parallel with the bottom surface 2a of cylinder head 2 and piston exhaust side
Portion 16 constitutes press section 12, thus, it is possible to reduce the volume of combustion chamber 6.It is therefore not necessary to greatly increase the height of protrusion 21
It just can be improved compression ratio.
In addition, according to the chamber structure of the engine 1 of the present embodiment, there is protrusion 21, protrusion 21 piston into
To piston intake side flat part 15 and piston exhaust side flat part 16 between gas side flat part 15 and piston exhaust side flat part 16
Top protuberance.
In addition, be provided with the 1st bowl of portion 22 in the top surface 5A of piston 5, the 1st bowl of portion 22 from protrusion 21 towards piston 5 in
Mandrel 5a is recessed into dome shape.
Protrusion 21 includes air inlet side peak potion 23, passes through air inlet side valve recess portion 17,18 and piston intake side flat part
15；Exhaust side peak potion 24 passes through exhaust side valve recess portion 19,20 and piston exhaust side flat part 16；1st linking peak potion 25,
The end 24a of its end 23a for being connected air inlet side peak potion 23 and exhaust side peak potion 24, and the radius of the top surface 5A along piston 5
Outer peripheral edge 5d on direction extends；And the 2nd linking peak potion 26, be connected air inlet side peak potion 23 end 23b and exhaust side peak
The end 24b in portion 24, and extend along the outer peripheral edge 5e on the radial direction of the top surface 5A of piston 5.
1st linking peak potion 25 and the 2nd is connected the position that peak potion 26 is located higher than air inlet side peak potion 23 and exhaust side peak potion 24.
Air inlet side peak potion 23 is in piston intake side flat part 15 and air inlet side valve recess portion 17,18 in the height side of piston 5
The position 27 intersected upwards is nearby by piston intake side flat part 15, also, with from 15 direction of piston intake side flat part
1st linking peak potion 25 and the 2nd is connected peak potion 26 and extends, and the height of air inlet side peak potion 23 increases continuously.
Exhaust side peak potion 24 is in piston exhaust side flat part 16 and exhaust side valve recess portion 19,20 in the height side of piston 5
The position 28 intersected upwards is nearby by piston exhaust side flat part 16, also, with from 16 direction of piston exhaust side flat part
1st linking peak potion 25 and the 2nd is connected peak potion 26 and extends, and the height of exhaust side peak potion 24 increases continuously.
Thus, it is possible to air inlet side peak potion 23 and exhaust side peak potion 24 are arranged far to the position of the central axis 5a of piston 5,
It and is the position close to piston intake side flat part 15 and piston exhaust side flat part 16.
It is therefore not necessary to which the height for greatly increasing protrusion 21 just can be improved compression ratio, and the 1st bowl of portion 22 can be made
It shoals, expands the setting area in the 1st bowl of portion 22, the radius of curvature R 1 in the 1st bowl of portion 22 can be made to become larger.
Therefore, the global shape of the combustion chamber 6 when piston 5 can be made to be located at top dead centre is able to maintain in gas close to spherical
The flowing for the gaseous mixture that the inside of cylinder 4 is circled round in the longitudinal direction.As a result, fuel and air can be made uniform in combustion chamber 6
Ground mixing, can be improved the flammability of gaseous mixture.
Figure 11 is the figure for showing the flowing of gaseous mixture of the combustion chamber 6 when piston 5 is located at top dead centre, and the line the thick then to indicate mixed
The flow velocity for closing gas is bigger.According to Figure 11 it will be apparent that, in the chamber structure of the engine 1 of the present embodiment, such as arrow A institute
Show, be able to maintain the flowing of the gaseous mixture to circle round in the longitudinal direction in the inside of cylinder 4, this is through experimental confirmation.
In addition, according to the chamber structure of the engine 1 of the present embodiment, in the short transverse of piston 5, air inlet side valve
Recess portion 17,18 is formed from piston intake side flat part 15 to protrusion 21, and exhaust side valve recess portion 19,20 is flat from piston exhaust side
Smooth portion 16 is formed to protrusion 21.
Thus, it is possible to air inlet side valve recess portion 17,18 and the 1st bowl of portion 22 are connected by a lower height of protrusion 21, and
And exhaust side valve recess portion 19,20 and the 1st bowl of portion 22 can be connected by a lower height of protrusion 21.
Therefore, the sky of the inside of air inlet side valve recess portion 17,18 and exhaust side valve recess portion 19,20 can be smoothly connected to
Between space with the inside in the 1st bowl of portion 22, can make to enter air inlet side valve recess portion 17,18 and exhaust side valve recess portion 19,20
Gaseous mixture be readily burned, can more effectively improve the flammability of gaseous mixture.
Moreover, the 1st bowl of portion 22 is that depth is shallower and the biggish dome shape of surface area, therefore, with as previous in piston
The higher-height protrusion of top side configuration and chamber structure in the deeper bowl portion of the protrusion configurable deep compare, can
Reduce the surface area of the top surface 5A of piston 5.Therefore, the surface area of combustion chamber 6 can be reduced.
As a result, can reduce the outside for being discharged into engine 1 from the wall surface of combustion chamber 6 due to the thermal energy of burning gases
Caused by engine 1 cooling loss, can more effectively improve the flammability of gaseous mixture.
In addition, being provided with spark plug in the central portion of roof 2R according to the chamber structure of the engine 1 of the present embodiment
30。
Moreover, the central portion in the 1st bowl of portion 22 is arranged in the 2nd bowl of portion 29, the 2nd bowl of portion 29 is formed as radius and is less than with piston 5
Central axis 5a centered on the 1st bowl of portion 22 radius and dome shape depth be greater than the 1st bowl of portion 22 dome shape depth.
Thus, it is possible to the flowing for the gaseous mixture that the inside for being maintained at cylinder 4 is circled round in the longitudinal direction, and the 2nd can be utilized
Bowl portion 29 makes the flame generated by spark plug 30 be difficult to contact with the 1st bowl of portion 22.To can not only more effectively improve mixing
The flammability of gas, additionally it is possible to more effectively reduce the cooling loss of engine 1.
Although disclosing the embodiment of the present invention, it is apparent that, those skilled in the art can not depart from model of the invention
It is changed in the case where enclosing.It is intended to all this modifications and equivalent include in the appended claims.
Claims (2)
1. a kind of chamber structure of internal combustion engine,
With combustion chamber, above-mentioned combustion chamber is formed by cylinder block, piston and cylinder head, and above-mentioned cylinder block has cylinder, above-mentioned
Piston is accommodated in above-mentioned cylinder and can move back and forth, and above-mentioned cylinder head is assemblied in above-mentioned cylinder block,
Above-mentioned cylinder head includes roof, is inclined ridge-roof type, and a pair of of intake valve and a pair of of exhaust valve can be arranged as a result,
At mutually to opposite side inclination；And bottom surface, extend with the orthogonality of center shaft of above-mentioned piston,
It is formed with press section between above-mentioned roof and the top surface of above-mentioned piston,
It is provided with protrusion in the top surface of above-mentioned piston, surrounds bowl portion；And a pair of of air inlet side valve recess portion and a pair are vented
Side valve recess portion avoids interfering with above-mentioned a pair of of intake valve and above-mentioned a pair of of exhaust valve,
The chamber structure of above-mentioned internal combustion engine is characterized in that,
Above-mentioned press section includes cylinder head air inlet side flat part gentle head exhaust side flat part, is set to above-mentioned roof, with
The bottom surface of above-mentioned cylinder head is parallel, and is at least located at outside compared with above-mentioned a pair of of intake valve and above-mentioned a pair of of exhaust valve；Piston
Air inlet side flat part is set to the top surface of above-mentioned piston and opposite with above-mentioned cylinder head air inlet side flat part, and its top end part
It is extended between above-mentioned a pair of of air inlet side valve recess portion from the outer peripheral edge on the radial direction of the top surface of above-mentioned piston；And piston
Exhaust side flat part is set to the top surface of above-mentioned piston and opposite with above-mentioned cylinder head exhaust side flat part, and its top end part
It is extended between above-mentioned a pair of of exhaust side valve recess portion from the outer peripheral edge on the radial direction of the top surface of above-mentioned piston,
Above-mentioned protrusion is between above-mentioned piston intake side flat part and above-mentioned piston exhaust side flat part to above-mentioned piston intake
The top of side flat part and above-mentioned piston exhaust side flat part protuberance,
Above-mentioned a pair of air inlet side valve recess portion is formed from above-mentioned piston intake side flat part to above-mentioned protrusion,
Above-mentioned a pair of exhaust side valve recess portion is formed from above-mentioned piston exhaust side flat part to above-mentioned protrusion,
Above-mentioned bowl portion is recessed from above-mentioned protrusion towards the central axis of above-mentioned piston into dome shape,
Above-mentioned protrusion includes air inlet side peak potion, flat by above-mentioned a pair of of air inlet side valve recess portion and above-mentioned piston intake side
Smooth portion；Exhaust side peak potion passes through above-mentioned a pair of of exhaust side valve recess portion and above-mentioned piston exhaust side flat part；And the 1st rank
Peak potion and the 2nd linking peak potion are connect, is connected the end of above-mentioned air inlet side peak potion and the end of above-mentioned exhaust side peak potion, and along upper
The outer peripheral edge stated on the radial direction of the top surface of piston extends,
Above-mentioned 1st linking peak potion and above-mentioned 2nd linking peak potion are located higher than above-mentioned air inlet side peak potion and above-mentioned exhaust side peak potion
Position,
Above-mentioned air inlet side peak potion is in above-mentioned piston intake side flat part and above-mentioned a pair of of air inlet side valve recess portion in above-mentioned piston
The position intersected in short transverse nearby passes through above-mentioned piston intake side flat part, also, with flat from above-mentioned piston intake side
Smooth portion extends towards above-mentioned 1st linking peak potion and above-mentioned 2nd linking peak potion, and the height of above-mentioned air inlet side peak potion increases continuously,
Above-mentioned exhaust side peak potion is in above-mentioned piston exhaust side flat part and above-mentioned a pair of of exhaust side valve recess portion in above-mentioned piston
The position intersected in short transverse nearby passes through above-mentioned piston exhaust side flat part, also, with flat from above-mentioned piston exhaust side
Smooth portion extends towards above-mentioned 1st linking peak potion and above-mentioned 2nd linking peak potion, and the height of above-mentioned exhaust side peak potion increases continuously.
2. the chamber structure of internal combustion engine according to claim 1, which is characterized in that be arranged in the central portion of above-mentioned roof
There is spark plug,
In the case where above-mentioned bowl portion is set as the 1st bowl of portion, the central portion in above-mentioned 1st bowl of portion is arranged in the 2nd bowl of portion, and above-mentioned
2nd bowl of portion arranges in the up-down direction with above-mentioned spark plug,
Above-mentioned 2nd bowl of portion be formed as radius be less than above-mentioned 1st bowl of portion centered on the central axis of above-mentioned piston radius and
Dome shape depth is greater than the dome shape depth in above-mentioned 1st bowl of portion.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2017-211812 | 2017-11-01 | ||
| JP2017211812A JP6946944B2 (en) | 2017-11-01 | 2017-11-01 | Combustion chamber structure of internal combustion engine |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN109751114A true CN109751114A (en) | 2019-05-14 |
| CN109751114B CN109751114B (en) | 2021-03-16 |
Family
ID=66138337
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201811291051.9A Active CN109751114B (en) | 2017-11-01 | 2018-10-31 | Combustion chamber structure of internal combustion engine |
Country Status (4)
| Country | Link |
|---|---|
| JP (1) | JP6946944B2 (en) |
| CN (1) | CN109751114B (en) |
| DE (1) | DE102018218523B4 (en) |
| FR (1) | FR3073005B1 (en) |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH08144767A (en) * | 1994-11-25 | 1996-06-04 | Yamaha Motor Co Ltd | Combustion chamber structure of engine |
| CN101473121A (en) * | 2006-06-26 | 2009-07-01 | 本田技研工业株式会社 | Direct fuel injection diesel engine |
| US20100000493A1 (en) * | 2008-07-07 | 2010-01-07 | Mazda Motor Corporation | Spark ignited internal combustion engine and manufacturing the same |
| JP2011074836A (en) * | 2009-09-30 | 2011-04-14 | Daihatsu Motor Co Ltd | Internal combustion engine |
| JP6088015B1 (en) * | 2015-09-18 | 2017-03-01 | 富士重工業株式会社 | Fuel injection device |
Family Cites Families (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS503496A (en) | 1973-05-16 | 1975-01-14 | ||
| US6725828B1 (en) | 2003-06-17 | 2004-04-27 | Ford Global Technologies, Llc | Vortex-induced stratification combustion for direct injection spark ignition engines |
| JP5003496B2 (en) | 2008-01-08 | 2012-08-15 | マツダ株式会社 | Reciprocating engine |
| JP6088016B1 (en) | 2015-09-18 | 2017-03-01 | 富士重工業株式会社 | piston |
| JP7346929B2 (en) | 2019-06-20 | 2023-09-20 | ブラザー工業株式会社 | liquid discharge device |
-
2017
- 2017-11-01 JP JP2017211812A patent/JP6946944B2/en active Active
-
2018
- 2018-10-26 FR FR1859976A patent/FR3073005B1/en active Active
- 2018-10-30 DE DE102018218523.9A patent/DE102018218523B4/en active Active
- 2018-10-31 CN CN201811291051.9A patent/CN109751114B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH08144767A (en) * | 1994-11-25 | 1996-06-04 | Yamaha Motor Co Ltd | Combustion chamber structure of engine |
| CN101473121A (en) * | 2006-06-26 | 2009-07-01 | 本田技研工业株式会社 | Direct fuel injection diesel engine |
| US20100000493A1 (en) * | 2008-07-07 | 2010-01-07 | Mazda Motor Corporation | Spark ignited internal combustion engine and manufacturing the same |
| JP2011074836A (en) * | 2009-09-30 | 2011-04-14 | Daihatsu Motor Co Ltd | Internal combustion engine |
| JP6088015B1 (en) * | 2015-09-18 | 2017-03-01 | 富士重工業株式会社 | Fuel injection device |
Also Published As
| Publication number | Publication date |
|---|---|
| FR3073005A1 (en) | 2019-05-03 |
| JP2019085880A (en) | 2019-06-06 |
| DE102018218523A1 (en) | 2019-05-02 |
| CN109751114B (en) | 2021-03-16 |
| FR3073005B1 (en) | 2021-12-10 |
| JP6946944B2 (en) | 2021-10-13 |
| DE102018218523B4 (en) | 2021-08-05 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| US10060386B2 (en) | Piston for a cylinder of a combustion engine | |
| US20150107543A1 (en) | Piston of an internal combustion engine | |
| CN107923305A (en) | Deflection combustion chamber for opposed piston engine | |
| JP2008531916A (en) | Improved cylinder head assembly | |
| CN110388278A (en) | The cylinder cover of internal combustion engine | |
| JP2013160186A (en) | Piston combustion chamber structure of internal combustion engine | |
| CN109751114A (en) | The chamber structure of internal combustion engine | |
| JP2022140601A (en) | internal combustion engine | |
| JP2008522091A (en) | Piston for internal combustion engine | |
| JPH08506404A (en) | Combustion chamber of internal combustion engine having a plurality of valves | |
| JP2008202577A (en) | Internal combustion engine | |
| CN210829520U (en) | Double-spherical top surface piston and engine | |
| US20220162982A1 (en) | Engine with combustion chamber | |
| CN214944601U (en) | Piston and engine | |
| CN100494651C (en) | Tent shaped overhead four-air valve petrol engine combustion chamber | |
| CN114810411B (en) | Piston and gas engine | |
| JP4075471B2 (en) | In-cylinder direct injection internal combustion engine | |
| CN114810412B (en) | Piston and gas engine | |
| CN220365655U (en) | Piston structure | |
| CN106567775A (en) | Double-rotor engine | |
| US20200217267A1 (en) | Parabolic combustion engine | |
| JP6060126B2 (en) | Internal combustion engine | |
| JP2002180835A (en) | Combustion device for swirl chamber engine | |
| JP3246441B2 (en) | Piston for in-cylinder injection internal combustion engine | |
| CN206360781U (en) | A kind of birotary engine |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |