CN104879234B - A kind of engine piston - Google Patents
A kind of engine piston Download PDFInfo
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- CN104879234B CN104879234B CN201510268383.5A CN201510268383A CN104879234B CN 104879234 B CN104879234 B CN 104879234B CN 201510268383 A CN201510268383 A CN 201510268383A CN 104879234 B CN104879234 B CN 104879234B
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- piston
- plane
- pit
- top surface
- squish area
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- 238000002485 combustion reaction Methods 0.000 claims description 12
- 230000015572 biosynthetic process Effects 0.000 claims description 4
- 230000000694 effects Effects 0.000 abstract description 4
- 239000007789 gas Substances 0.000 description 9
- 230000006835 compression Effects 0.000 description 5
- 238000007906 compression Methods 0.000 description 5
- 239000004215 Carbon black (E152) Substances 0.000 description 3
- 239000002737 fuel gas Substances 0.000 description 3
- 229930195733 hydrocarbon Natural products 0.000 description 3
- 150000002430 hydrocarbons Chemical class 0.000 description 3
- 238000000034 method Methods 0.000 description 3
- 230000008901 benefit Effects 0.000 description 2
- 230000008450 motivation Effects 0.000 description 2
- 230000008569 process Effects 0.000 description 2
- 230000009471 action Effects 0.000 description 1
- 125000004122 cyclic group Chemical group 0.000 description 1
- 230000007423 decrease Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 239000000446 fuel Substances 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000006641 stabilisation Effects 0.000 description 1
- 238000011105 stabilization Methods 0.000 description 1
Classifications
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- 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
-
- 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
- F02F3/24—Pistons having means for guiding gases in cylinders, e.g. for guiding scavenging charge in two-stroke engines
-
- 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
- F02F3/26—Pistons having combustion chamber in piston head
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- 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)
Abstract
The present invention discloses a kind of engine piston, belongs to engine component field.Engine piston includes: piston only, and the top surface of piston only is provided with pit for the top surface of plane and piston only.The present invention is by setting plane for the top surface of piston only, and pit is set in the top surface of piston only, the distance between the pitted surface of pit and spark plug are relatively large, influence of the air velocity of the top surface of engine piston to spark plug is reduced, air velocity at spark plug reduces, it solves in the prior art since the air velocity at spark plug is larger, caused spark ignitor early period, the fiery nuclear stability of spark plug is poor, larger problem is inclined in the pinking of engine, the air velocity reduced at spark plug is reached, stablize fire core, reduce the effect of the pinking tendency of engine.
Description
Technical field
The present invention relates to engine component field, in particular to a kind of engine piston.
Background technique
Piston is engine " heart ", cooperatively forms combustion chamber with cylinder body and cylinder cap.It is being burnt by fuel gas
Indoor Combustion generates high temperature and high pressure gas expansion work, and then piston motion is pushed to drive the crankshaft rotation connecting with the piston
Output torque.
Existing piston is usually cylindrical-shaped structure, is arranged in the cylinder body of engine, and the inner cavity of cylinder body is located at cylinder body
The cylinder cap of inner cavity one end and the top surface of the piston positioned at the inner cavity other end of cylinder body constitute combustion chamber, be provided on cylinder cap into
Air flue and exhaust duct, wherein be provided with inlet valve in air intake duct, be provided with exhaust valve in exhaust duct, on cylinder cap with piston-top surface
It is provided with spark plug at the opposite position in center, is provided with fuel gas in combustion chamber.Engine in the process of work, works as work
When plug is located at top dead centre, inlet valve is opened, and during piston is moved from top dead centre to lower dead center, outside air passes through air intake duct
It is mixed into combustion chamber and with the indoor fuel gas that burns, when piston motion to lower dead center, IC Intake Valve Closes, piston is under
Stop is moved to top dead centre, the intracorporal mixed gas of compression cylinder, and when piston reaches top dead centre, spark plug issues spark, is lighted
The intracorporal mixed gas of cylinder, so that the indoor mixed gas expansion work that burns, pushes piston to move to lower dead center.Wherein, living
Plug top surface is generally planar or convex surface, top dead centre are position when piston-top surface highest point is maximum with a distance from crankshaft rotation center,
Lower dead center is position when piston-top surface highest point is minimum with a distance from crankshaft rotation center.
In the implementation of the present invention, the inventor finds that the existing technology has at least the following problems:
The top surface of existing piston is plane or convex surface, when piston reaches top dead centre, indoor air velocity of burning
It is larger, cause the air velocity at spark plug larger, in spark ignitor early period, the fiery nuclear stability of spark plug is poor, starts
The pinking tendency of machine is larger.
Summary of the invention
In order to solve when piston reaches top dead centre, indoor air velocity of burning is larger, leads to the air-flow at spark plug
Speed is larger, burns early period in mixed gas, and the fiery nuclear stability of spark plug is poor, and the pinking tendency of engine is biggish to ask
Topic, the present invention provide a kind of engine piston.The technical solution is as follows:
In a first aspect, providing a kind of engine piston, the engine piston includes: piston only,
The top surface of the piston only is provided with pit for the top surface of plane and the piston only.
Optionally, the piston only is cylindrical-shaped structure, and the pit is arranged in the top surface of the piston only
The heart.
Optionally, the pit is spherical surface pit.
Optionally, the inner cavity of the cylinder body of engine, positioned at described inner cavity one end cylinder cap and be located at the inner cavity it is another
The top surface of the piston only at end constitutes combustion chamber, is provided with air intake duct and exhaust duct on the cylinder cap,
The top surface of the piston only is provided with air inlet squish area and exhaust squish area, the air inlet squish area and described
It is vented squish area to be symmetrical arranged by the plane of symmetry of the first lengthwise cross section of the piston only, and the air inlet squish area and described
Exhaust squish area is connected to the pit respectively；
Wherein, the air inlet squish area is corresponding with the inlet valve being arranged in the air intake duct, the exhaust squish area with
The exhaust valve being arranged in the exhaust duct is corresponding.
Optionally, 2 bulge-structures are provided on the top surface of the piston only, any bulge-structure is axial symmetry
Structure, and it is symmetrical about first lengthwise cross section, each bulge-structure is located at the edge of the pit；
2 bulge-structures are symmetrical arranged by the plane of symmetry of the second lengthwise cross section of the piston only, and described second
Lengthwise cross section is vertical with first lengthwise cross section and intersects, the intersection of second lengthwise cross section and first lengthwise cross section
Line is the axis of the piston only.
Optionally, the bulge-structure is included: protrusion and is symmetricly set on using first lengthwise cross section as the plane of symmetry
The inclined-plane of the protrusion two sides,
The upper surface of the protrusion is plane, the upper surface of the protrusion by the inclined-plane respectively with the air inlet squish
Area is connected with the exhaust squish area.
Optionally, the bulge-structure further include: inlet valve valve pit and exhaust valve valve pit,
The inlet valve valve pit is arranged at the position that the first inclined-plane is connect with the air inlet squish area, and described first tiltedly
Face is the inclined-plane for connecting the upper surface of the air inlet squish area and the protrusion；
The exhaust valve valve pit is arranged at the position that the second inclined-plane is connect with the exhaust squish area, and described second tiltedly
Face is the inclined-plane of the upper surface of the connection exhaust squish area and the protrusion.
Optionally, any bulge-structure is located on first lengthwise cross section and the axis far from the piston only
Position to the piston only axis distance be 23 millimeters to 27 millimeters.
Optionally, the top surface of the piston only surrounds closing far from the side of the pit with any bulge-structure
Region, top surface described in edge of the closed area close to the top surface of the piston only extend radially outwardly 1.5 millimeters extremely
2.5 millimeters of formation redundant areas.
Optionally, the interconnecting piece of the pit and the air inlet squish area, the exhaust squish area and the bulge-structure
Position smooth excessiveness；
The upper surface of the protrusion and connecting portion, first inclined-plane and the inlet valve valve pit on the inclined-plane
The equal smooth excessiveness of connecting portion of connecting portion, second inclined-plane and the exhaust valve valve pit.
Technical solution provided by the invention has the benefit that
Engine piston provided by the invention, by setting plane for the top surface of piston only, and in piston only
Pit is arranged in top surface, and the pitted surface and the distance between spark plug of pit are relatively large, the air velocity of the top surface of engine piston
Influence to spark plug is reduced, and the air velocity at spark plug reduces, and solves the air velocity at spark plug in the prior art
Larger, the fiery nuclear stability of caused spark ignitor early period, spark plug are poor, and larger problem is inclined in the pinking of engine,
Reach the air velocity reduced at spark plug, stablized fire core, reduces the effect of the pinking tendency of engine.
It should be understood that above general description and following detailed description be only it is exemplary and explanatory, not
It can the limitation present invention.
Detailed description of the invention
To describe the technical solutions in the embodiments of the present invention more clearly, make required in being described below to embodiment
Attached drawing is briefly described, it should be apparent that, drawings in the following description are only some embodiments of the invention, for
For those of ordinary skill in the art, without creative efforts, it can also be obtained according to these attached drawings other
Attached drawing.
Fig. 1 is a kind of schematic perspective view of engine piston provided in an embodiment of the present invention；
Fig. 2 is the schematic perspective view of another engine piston provided in an embodiment of the present invention；
Fig. 3 is the top view for the engine piston that embodiment illustrated in fig. 2 provides；
Fig. 4 is cross-sectional view of the engine piston along the direction A-A shown in Fig. 3 of embodiment illustrated in fig. 2 offer；
Fig. 5 is cross-sectional view of the engine piston along the direction B-B shown in Fig. 3 of embodiment illustrated in fig. 2 offer.
Specific embodiment
To make the object, technical solutions and advantages of the present invention clearer, below in conjunction with attached drawing to embodiment party of the present invention
Formula is described in further detail.
Referring to FIG. 1, it shows a kind of stereochemical structure signal of engine piston 01 provided in an embodiment of the present invention
Figure.Referring to Fig. 1, which includes: piston only 010.
The top surface W of piston only 010 is provided with pit 011 for the top surface W of plane and piston only 010.
Since the top surface W in piston only 010 is provided with pit 011, the distance between pitted surface and spark plug of pit 011
Relatively large, therefore, influence of the air velocity of the top surface of engine piston 01 to spark plug is reduced, the gas velocity at spark plug
Degree reduces.
In conclusion engine piston provided in an embodiment of the present invention, by setting plane for the top surface of piston only,
And pit is set in the top surface of piston only, the pitted surface and the distance between spark plug of pit are relatively large, engine piston
Influence of the air velocity of top surface to spark plug is reduced, and the air velocity at spark plug reduces, solve in the prior art due to
Air velocity at spark plug is larger, spark ignitor early period, and the fiery nuclear stability of spark plug is poor, the pinking tendency of engine
Larger problem has reached the air velocity reduced at spark plug, stablizes fire core, reduces the effect of the pinking tendency of engine.
Referring to FIG. 2, it shows that the stereochemical structure of another engine piston 01 provided in an embodiment of the present invention is shown
It is intended to.Referring to fig. 2, which includes: piston only 010.
The top surface of piston only 010 is provided with pit 011 for the top surface of plane and piston only 010.
Wherein, piston only 010 can be cylindrical-shaped structure, and pit 011 can be set in the top surface of piston only 010
Center, that is, the top surface of piston only 010 can be circular configuration, the center point of the circular configuration is arranged in pit 011, recessed
The center in hole 011 is overlapped with the center of circle of the circular configuration.Since spark plug is generally arranged at the top on cylinder cap with piston only 010
At the opposite position in the center in face, therefore, pit 011 is arranged in the center of the top surface of piston only 010, it can be more effective
Reduce influence of the air velocity of the top surface of engine piston to spark plug.
Optionally, round and smooth excessively and in order to improve the stabilization of spark for the ease of the top surface of pit and piston only 010
Property, pit 011 can be spherical surface pit.
Optionally, the inner cavity of the cylinder body of engine, positioned at engine cylinder body inner cavity one end cylinder cap and be located at hair
The top surface of the piston only 010 of the inner cavity other end of the cylinder body of motivation constitutes combustion chamber, is provided with air intake duct and exhaust on cylinder cap
Road, the top surface of piston only 010 are provided with air inlet squish area 012 and exhaust squish area 013, and air inlet squish area 012 and exhaust are squeezed
Gas area 013 is symmetrical arranged with the first lengthwise cross section (being not shown in Fig. 2) of piston only 010 for the plane of symmetry, and air inlet squish area
012 and exhaust squish area 013 be connected to respectively with pit 011；Wherein, air inlet squish area 012 and the air inlet being arranged in air intake duct
Door is corresponding, and exhaust squish area 013 is corresponding with the exhaust valve being arranged in exhaust duct, and when inlet valve opening, extraneous air can be with
Enter combustion chamber by air intake duct, inlet valve, when IC Intake Valve Closes, when exhaust valve is opened, the indoor exhaust gas that burns can lead to
Exhaust valve is crossed, is discharged from exhaust duct, wherein air inlet squish area 012 and exhaust squish area 013 are all close for moving up in piston 01
Cooperate when top dead centre with air inlet squish area corresponding on cylinder cap, compressed gas, increase squish flow, improves tubulence energy in cylinder.
Further, any convex with continued reference to FIG. 2, being provided with 2 bulge-structures 014 on the top surface of piston only 010
Playing structure 014 is axially symmetric structure, and symmetrical about the first lengthwise cross section, and each bulge-structure 014 is located at the side of pit 011
Edge；2 bulge-structures 014 are symmetrical arranged with the second lengthwise cross section (being not shown in Fig. 2) of piston only 010 for the plane of symmetry, the
Two lengthwise cross sections are vertical with the first lengthwise cross section and intersect, and the intersecting lens of the second lengthwise cross section and the first lengthwise cross section is piston sheet
The axis of body 010, the axis of piston only 010 pass through the center of pit 011.
Optionally, bulge-structure 014 is included: protrusion 0141 and is symmetricly set on using the first lengthwise cross section as the plane of symmetry convex
Play the inclined-plane 0142 of two sides.
Protrusion 0141 upper surface can be plane, protrusion 0141 upper surface by inclined-plane 0142 respectively with air inlet squish
Area 012 and exhaust squish area 013 connect.
Optionally, bulge-structure 014 further include: inlet valve valve pit 0143 and exhaust valve valve pit 0144.
Inlet valve valve pit 0143 is arranged at the position that the first inclined-plane is connect with air inlet squish area 012, and the first inclined-plane is
In inclined-plane 0142, the inclined-plane of the upper surface of connection air inlet squish area 012 and protrusion 0141.
Exhaust valve valve pit 0144 is arranged at the position that the second inclined-plane is connect with exhaust squish area 013, and the second inclined-plane is
In inclined-plane 0142, the inclined-plane of the upper surface of connection exhaust squish area 013 and protrusion 0141.
Wherein, the presence of bulge-structure 014 can reduce the distance between edge and cylinder cap of pit 011, so that raised
The air velocity at 014 top of structure increases, and airflow direction is biased to spark plug direction, the air-flow above the pitted surface of pit 011
Direction is usually upward, and the air-flow at 014 top of bulge-structure bumps against in pit 011 with the air-flow above the pitted surface of pit 011, makes
Obtaining the air velocity near spark plug reduces.
Wherein, the presence of pit 011 can also increase the indoor tubulence energy of burning, so that when plug ignition, spark plug
Neighbouring turbulence can increase, and stablize spark, reduce the coefficient of cyclic variation (English: coefficient of of engine
Variation, referred to as: COV), reduce the pinking tendency of engine, improves efficiency of combustion.
Inlet valve valve pit 0143 and exhaust valve valve pit 0144 can to avoid engine piston 01 in the process of movement,
The top surface of piston only 010 collides with valve.
Optionally, the top surface of piston only 010 surrounds enclosed area far from the side of pit 011 with any bulge-structure 014
Domain, the extending radially outwardly of edge top surface of the closed area close to the top surface of piston only 010 to form redundant area 015, should
Redundant area 015 can be plane.Illustratively, which can be closed area close to the top surface of piston only 010
Edge top surface the distance d formation that extends radially outwardly, the value range of d can be with are as follows: 1.5 millimeters~2.5 millimeters.
Wherein, 1.5 millimeters~2.5 millimeters are set by the value range of d, flame propagation can be made to redundant area
015, reduce the discharge of hydrocarbon.
It should be noted that in embodiments of the present invention, pit 011 and air inlet squish area 012, exhaust squish area 013 and
The equal smooth excessiveness of the connecting portion of bulge-structure 014；The upper surface of protrusion 0141 and connecting portion, first inclined-plane on inclined-plane 0142
With the equal smooth excessiveness of connecting portion of the connecting portion of inlet valve valve pit 0143, the second inclined-plane and exhaust valve valve pit 0144.
Further, referring to FIG. 3, its show embodiment illustrated in fig. 2 provide engine piston 01 top view,
The structural schematic diagram of the top surface of the top view namely engine piston 01.Referring to Fig. 3, the top surface of piston only is plane and piston
The top surface of ontology is provided with pit 011.The top surface of piston only can be circular configuration, and the center of circle of the circular configuration is o, pit
011 can be set at the center of circle o of the circular configuration, and the center of pit 011 is overlapped with the center of circle o of the circular configuration.
Referring to Fig. 3, the top surface of piston only is additionally provided with air inlet squish area 012 and exhaust squish area 013, air inlet squish area
012 is symmetrical arranged with exhaust squish area 013 by the plane of symmetry of the first lengthwise cross section of piston only, and 012 He of air inlet squish area
Exhaust squish area 013 is connected to pit 011 respectively, wherein the first lengthwise cross section of piston only is to be parallel to B- shown in Fig. 3
The direction B, by center of circle o and the face vertical with the top surface of piston only.
Referring to Fig. 3,2 bulge-structures 014 are provided on the top surface of piston only, any bulge-structure 014 is axial symmetry
Structure, and it is symmetrical about the first lengthwise cross section, each bulge-structure 014 is located at the edge of pit 011；2 bulge-structures 014 can
To be symmetrical arranged by the plane of symmetry of the second lengthwise cross section of piston only, wherein the second lengthwise cross section of piston only is parallel
In the direction A-A shown in Fig. 3, by center of circle o and the face vertical with the top surface of piston only, the second lengthwise cross section of piston only
Vertical with the first lengthwise cross section and intersect, the intersecting lens of the second lengthwise cross section and the first lengthwise cross section is the axis of piston only,
The axis of piston only passes through the center of pit 011, that is, the axis of piston only passes through center of circle o shown in Fig. 3.
Wherein, bulge-structure 014 includes: protrusion 0141 and is symmetricly set on protrusion using the first lengthwise cross section as the plane of symmetry
Inclined-plane 0142, inlet valve valve pit 0143 and the exhaust valve valve pit 0144 of two sides.
Protrusion 0141 upper surface can be plane, protrusion 0141 upper surface can by inclined-plane 0142 respectively with air inlet
Squish area 012 and exhaust squish area 013 connect.The setting of inlet valve valve pit 0143 connects on the first inclined-plane and air inlet squish area 012
At the position connect, the first inclined-plane is the inclined-plane of the upper surface of connection air inlet squish area 012 and protrusion 0141 in inclined-plane 0142；Row
Valve valve pit 0144 be arranged in the second inclined-plane be vented at the position that connect of squish area 013, the second inclined-plane in inclined-plane 0142,
The inclined-plane of the upper surface of connection exhaust squish area 013 and protrusion 0141.
Optionally, the top surface of piston only surrounds closed area M far from the side of pit 011 with any bulge-structure 014,
Closed area M close to the top surface of piston only side m along the top surface of piston only extend radially outwardly distance d formed redundancy
Region 015, the redundant area 015 can be plane, wherein the value range of d can be with are as follows: 1.5 millimeters~2.5 millimeters, this takes
Value range can make flame propagation to redundant area 015, reduce the discharge of hydrocarbon.
Optionally, as shown in figure 3, any bulge-structure 014 is located on the first lengthwise cross section and the axis far from piston only
The position of line to piston only axis distance be D, wherein the value range of D can be 23 millimeters to 27 millimeters, wherein D
Value range be set as 23 millimeters of speed that can be effectively reduced at spark plug to 27 millimeters.
Further, referring to FIG. 4, it shows the engine piston 01 of embodiment illustrated in fig. 2 offer along shown in Fig. 3
The direction A-A cross-sectional view.Referring to fig. 4, which includes: piston only 010.
Piston only 010 can be cylindrical-shaped structure, and the top surface of piston only 010 can be plane and piston only 010
Top surface be provided with pit 011, as shown in figure 4, for the ease of pit and 011 piston only 010 top surface it is round and smooth excessively and
In order to improve the stability of spark, pit 011 can be spherical surface pit.
The top surface of piston only 010 is additionally provided with air inlet squish area 012 and exhaust squish area 013,012 He of air inlet squish area
It is vented squish area 013 to be symmetrical arranged with the first lengthwise cross section (being not shown in Fig. 4) of piston only 010 for the plane of symmetry, wherein living
First lengthwise cross section of plug body 010 be by the axis of piston only 010 and perpendicular to the face in paper direction shown in Fig. 4,
Air inlet squish area 012 and exhaust squish area 013 are connected to pit 011 respectively, and the connection of air inlet squish area 012 and pit 011
Position, the equal smooth excessiveness of connecting portion for being vented squish area 013 and pit 011.
Bulge-structure 014 is provided on the top surface of piston only 010, bulge-structure 014 can be axially symmetric structure, and close
Symmetrical in the first lengthwise cross section of piston only 010, bulge-structure 014 be may include: protrusion 0141 and be cut with first longitudinal axis
Face is the inclined-plane 0142 that the plane of symmetry is symmetricly set on raised two sides.
Protrusion 0141 upper surface can be plane, protrusion 0141 upper surface by inclined-plane 0142 respectively with air inlet squish
Area 012 and exhaust squish area 013 connect, the upper surface of protrusion 0141 and the connecting portion smooth excessiveness on inclined-plane 0142, inclined-plane
0142 with air inlet squish area 012, be vented squish area 013 the equal smooth excessiveness of connecting portion.
Bulge-structure 014 can also include: 0144 (Fig. 4 of inlet valve valve pit (being not shown in Fig. 4) and exhaust valve valve pit
In be not shown).Inlet valve valve pit is arranged at the position that the first inclined-plane is connect with air inlet squish area 012, and the first inclined-plane is oblique
In face 0142, the inclined-plane of the upper surface of connection air inlet squish area 012 and protrusion 0141；Exhaust valve valve pit is arranged on the second inclined-plane
At the position connecting with exhaust squish area 013, the second inclined-plane is connection exhaust squish area 013 and protrusion 0141 in inclined-plane 0142
Upper surface inclined-plane.Connecting portion, the second inclined-plane and the exhaust valve valve pit on the first inclined-plane and inlet valve valve pit 0143
The equal smooth excessiveness of 0144 connecting portion.
Further, referring to FIG. 5, it shows the engine piston 01 of embodiment illustrated in fig. 2 offer along shown in Fig. 3
The direction B-B cross-sectional view.Referring to Fig. 5, which includes: piston only 010.Piston only 010 can be straight
The different cylindrical-shaped structure of diameter, illustratively, diameter of the piston only 010 close to one end of the top surface of piston only 010, which is greater than, lives
The diameter of one end of top surface of the plug body 010 far from piston only 010.
The top surface of piston only 010 can be for plane and the top surface of piston only 010 is provided centrally with pit 011, recessed
The center in hole 011 is overlapped with the center of the top surface of the piston only 010.As shown in figure 5, for the ease of pit and 011 piston sheet
The top surface of body 010 is round and smooth excessively and in order to improve the stability of spark, and pit 011 can be spherical surface pit.
Further, 2 bulge-structures, 014,2 bulge-structures 014 are provided on the top surface of piston only 010 with piston
The second lengthwise cross section (being not shown in Fig. 5) of ontology 010 is symmetrical arranged for the plane of symmetry, wherein the of piston only 010
Two lengthwise cross sections be by the axis of piston only 010 and perpendicular to the face in paper direction shown in fig. 5, piston only 010
Second lengthwise cross section is vertical with the first lengthwise cross section and intersects, and the intersecting lens of the second lengthwise cross section and the first lengthwise cross section is to live
The axis of plug body 010, the axis of piston only 010 pass through the center of pit 011.
Optionally, bulge-structure 014 is included: protrusion 0141 and is symmetricly set on using the first lengthwise cross section as the plane of symmetry convex
Play the inclined-plane 0142 of two sides.The upper surface of protrusion 0141 is plane.
Optionally, bulge-structure 014 can also include: inlet valve valve pit (being not shown in Fig. 5) and (not show in Fig. 5
Out).
Optionally, the top surface of piston only 010 surrounds enclosed area far from the side of pit 011 with any bulge-structure 014
Domain, the extending radially outwardly of edge top surface of the closed area close to the top surface of piston only 010 to form redundant area 015, should
Redundant area 015 can be plane.Illustratively, which can be closed area close to the top surface of piston only 010
Edge top surface the distance d formation that extends radially outwardly, the value range of d can be with are as follows: 1.5 millimeters~2.5 millimeters, the value
Range can make flame propagation to redundant area 015, reduce the discharge of hydrocarbon.
In conclusion engine piston provided in an embodiment of the present invention, by setting plane for the top surface of piston only,
And pit is set in the top surface of piston only, the pitted surface and the distance between spark plug of pit are relatively large, engine piston
Influence of the air velocity of top surface to spark plug is reduced, and the air velocity at spark plug reduces, solve in the prior art due to
Air velocity at spark plug is larger, and the fiery nuclear stability of caused spark ignitor early period, spark plug are poor, engine it is quick-fried
Larger problem is inclined in shake, has reached the air velocity reduced at spark plug, stablizes fire core, reduces the pinking tendency of engine
Effect.
Engine piston provided in an embodiment of the present invention is particularly suitable for equipped with high tumble inlet port, the hair of high compression ratio
Motivation, for the engine of high tumble flow high compression ratio compared with traditional engine, maximum feature is exactly the burning in compression travel
Indoor air velocity is bigger, and in engine ignition, the air velocity near spark plug is larger, before seriously affecting spark ignitor
The stability of phase fire core, easily leads to and catches fire, and the period of expansion of the flame in spark plug, and flame is easier to be heavily biased towards combustion chamber
Side increases combustion knock tendency, engine power performance is caused to decline, and fuel thermal efficiency reduces, and oil consumption rate increases.It incite somebody to action this
The engine piston that inventive embodiments provide applies the engine under high tumble flow high compression ratio, can reduce near spark plug
Air velocity improves the tubulence energy near spark plug, to stablize burning fire early period core, improves flame propagation, reduces engine
Pinking improves engine thermal efficiency.
The foregoing is merely presently preferred embodiments of the present invention, is not intended to limit the invention, it is all in spirit of the invention and
Within principle, any modification, equivalent replacement, improvement and so on be should all be included in the protection scope of the present invention.
Claims (2)
1. a kind of engine piston, which is characterized in that the engine piston includes: piston only,
The top surface of the piston only is provided with pit for the top surface of plane and the piston only；
2 bulge-structures are provided on the top surface of the piston only, any bulge-structure is axially symmetric structure, and about
First lengthwise cross section of the piston only is symmetrical, and each bulge-structure is located at the edge of the pit；
2 bulge-structures are symmetrical arranged by the plane of symmetry of the second lengthwise cross section of the piston only, second longitudinal axis
Section is vertical with first lengthwise cross section and intersects, and the intersecting lens of second lengthwise cross section and first lengthwise cross section is
The axis of the piston only；
The top surface of the piston only surrounds closed area, the envelope far from the side of the pit with any bulge-structure
1.5 millimeters to the 2.5 millimeters formation that extend radially outwardly of top surface described in edge of the closed region close to the top surface of the piston only
Redundant area；
Any bulge-structure is located on first lengthwise cross section and the position of the axis far from the piston only is to institute
The distance for stating the axis of piston only is 23 millimeters to 27 millimeters；
The piston only is cylindrical-shaped structure, and the center of the top surface of the piston only is arranged in the pit；
The inner cavity of the cylinder body of engine, the cylinder cap positioned at described inner cavity one end and the piston positioned at the inner cavity other end
The top surface of ontology constitutes combustion chamber, is provided with air intake duct and exhaust duct on the cylinder cap,
The top surface of the piston only is provided with air inlet squish area and exhaust squish area, and the air inlet squish area and the exhaust are squeezed
Gas area is symmetrical arranged by the plane of symmetry of first lengthwise cross section of the piston only, and the air inlet squish area and the row
Gas squish area is connected to the pit respectively；
Wherein, the air inlet squish area is corresponding with the inlet valve being arranged in the air intake duct, the exhaust squish area and setting
Exhaust valve in the exhaust duct is corresponding；
The bulge-structure includes: protrusion and is symmetricly set on the raised two sides by the plane of symmetry of first lengthwise cross section
Inclined-plane；
The upper surface of the protrusion is plane, the upper surface of the protrusion by the inclined-plane respectively with the air inlet squish area and
The exhaust squish area connection；
The bulge-structure further include: inlet valve valve pit and exhaust valve valve pit；
The inlet valve valve pit is arranged at the position that the first inclined-plane is connect with the air inlet squish area, and first inclined-plane is
Connect the inclined-plane of the upper surface of the air inlet squish area and the protrusion；
The exhaust valve valve pit is arranged at the position that the second inclined-plane is connect with the exhaust squish area, and second inclined-plane is
Connect the inclined-plane of the upper surface of the exhaust squish area and the protrusion；
The connecting portion smooth excessiveness of the pit and the air inlet squish area, the exhaust squish area and the bulge-structure；
The connection of the connecting portion, first inclined-plane and the inlet valve valve pit of the upper surface and inclined-plane of the protrusion
The equal smooth excessiveness of connecting portion at position, second inclined-plane and the exhaust valve valve pit.
2. engine piston according to claim 1, which is characterized in that
The pit is spherical surface pit.
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| CN201510268383.5A CN104879234B (en) | 2015-05-22 | 2015-05-22 | A kind of engine piston |
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Families Citing this family (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106640403A (en) * | 2016-08-29 | 2017-05-10 | 中国第汽车股份有限公司 | Tumble guide type high compression ratio piston of gasoline engine |
| CN106593680A (en) * | 2016-11-23 | 2017-04-26 | 奇瑞汽车股份有限公司 | Piston for direct injection gasoline engine of center-arranged oil injector |
| CN106870120A (en) * | 2017-03-21 | 2017-06-20 | 中国第汽车股份有限公司 | A kind of high-efficiency engine combustion system |
| CN108561237B (en) * | 2018-05-24 | 2024-05-14 | 华域科尔本施密特活塞有限公司 | Gasoline engine aluminum piston valve pit and flash processing technology thereof |
| CN109763891A (en) * | 2019-03-27 | 2019-05-17 | 江铃汽车股份有限公司 | A kind of Atkinson engine piston combustion chamber |
| CN112031948B (en) * | 2020-08-18 | 2021-11-02 | 清华大学 | Spark compression ignition type piston, combustion system, power assembly system and control method |
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| CN201461121U (en) * | 2009-07-30 | 2010-05-12 | 重庆长安汽车股份有限公司 | Piston |
| CN201554570U (en) * | 2009-11-23 | 2010-08-18 | 重庆长安汽车股份有限公司 | Direct-injection gasoline engine piston |
| JP2011132833A (en) * | 2009-12-22 | 2011-07-07 | Fuji Heavy Ind Ltd | Cylinder injection engine |
| CN202628300U (en) * | 2012-04-19 | 2012-12-26 | 浙江吉润汽车有限公司 | Direct injection petrol motor piston |
| CN104033233A (en) * | 2013-03-08 | 2014-09-10 | 铃木株式会社 | Combustion Chamber Structure Of Internal-combustion Engine |
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| US7484498B2 (en) * | 2006-03-31 | 2009-02-03 | Mazda Motor Corporation | Spark-ignition gasoline engine |
| CN201007242Y (en) * | 2007-01-31 | 2008-01-16 | 天津内燃机研究所 | Motorcycle engine piston used for spherical-segment combustion chamber |
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| CN201461121U (en) * | 2009-07-30 | 2010-05-12 | 重庆长安汽车股份有限公司 | Piston |
| CN201554570U (en) * | 2009-11-23 | 2010-08-18 | 重庆长安汽车股份有限公司 | Direct-injection gasoline engine piston |
| JP2011132833A (en) * | 2009-12-22 | 2011-07-07 | Fuji Heavy Ind Ltd | Cylinder injection engine |
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