CN104879234A - Engine piston - Google Patents
Engine piston Download PDFInfo
- Publication number
- CN104879234A CN104879234A CN201510268383.5A CN201510268383A CN104879234A CN 104879234 A CN104879234 A CN 104879234A CN 201510268383 A CN201510268383 A CN 201510268383A CN 104879234 A CN104879234 A CN 104879234A
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- Prior art keywords
- piston
- pit
- plane
- face
- squish area
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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
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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
- F02F3/24—Pistons having means for guiding gases in cylinders, e.g. for guiding scavenging charge in two-stroke engines
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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
- F02F3/26—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 invention discloses an engine piston, and belongs to the field of engine parts. The engine piston comprises a piston body, the top face of the piston body is a plane, and a pit is formed in the top face of the piston body. According to the engine piston, the top face of the piston body is arranged to be the plane, the pit is formed in the top face of the piston body, the distance between the pit face of the pit and a sparking plug is relatively larger, influences of the airflow speed of the top face of the engine piston on the sparking plug are reduced, the airflow speed at the position of the sparking plug is decreased, the problems that in the prior art, as the airflow speed at the position of the sparking plug is higher, at the earlier stage when the sparking plug is ignited, the stability of a fire core of the sparking plug is poor, and the knocking inclination of an engine is larger are solved, and the effects of decreasing the airflow speed at the position of the sparking plug, stabilizing the fire core and reducing the knocking inclination of the engine are achieved.
Description
Technical field
The present invention relates to engine component field, particularly a kind of engine piston.
Background technique
Piston is motor " heart ", and it coordinates with cylinder body and cylinder cap and forms firing chamber.By inflammable gas in firing chamber combustion, produce high temperature and high pressure gas expansion work, and then promotion piston movement drives the crankshaft rotating Driving Torque be connected with this piston.
Existing piston is generally cylindrical-shaped structure, it is arranged in the cylinder body of motor, the end face of piston of the inner chamber of cylinder body, the cylinder cap being positioned at inner chamber one end of cylinder body and the inner chamber the other end that is positioned at cylinder body forms firing chamber, cylinder cap is provided with intake duct and air outlet flue, wherein, in intake duct, be provided with intake valve, in air outlet flue, be provided with exhaust valve, position relative with piston-top surface center on cylinder cap is provided with spark plug, is provided with inflammable gas in firing chamber.Motor is in the process of work, when the piston is at the top dead center, intake valve is opened, the process that piston moves from top dead center to lower dead center, ambient air enters firing chamber by intake duct and mixes with the inflammable gas in firing chamber, when piston movement is to lower dead center, IC Intake Valve Closes, piston moves from lower dead center to top dead center, the mixed gas in compression cylinder, when piston arrives top dead center, spark plug sends spark, light the mixed gas in cylinder body, make the mixed gas expansion work in firing chamber, promote piston and move to lower dead center.Wherein, piston-top surface is generally plane or convex surface, top dead center be piston-top surface peak maximum from crankshaft rotating centre distance time position, lower dead center be piston-top surface peak minimum from crankshaft rotating centre distance time position.
Realizing in process of the present invention, inventor finds that prior art at least exists following problem:
The end face of existing piston is plane or convex surface, and when piston arrives top dead center, the airspeed in firing chamber is larger, cause the airspeed at spark plug place larger, in spark ignitor in earlier stage, the fiery nuclear stability of spark plug is poor, and the tendency to detonate of motor is larger.
Summary of the invention
In order to solve when piston arrives top dead center, the airspeed in firing chamber is comparatively large, causes the airspeed at spark plug place larger, in mixed gas burning in earlier stage, the fiery nuclear stability of spark plug is poor, the problem that the tendency to detonate of motor is larger, the invention provides a kind of engine piston.Described technological scheme is as follows:
First aspect, provides a kind of engine piston, and described engine piston comprises: piston only,
The end face of described piston only is plane and the end face of described piston only is provided with pit.
Alternatively, described piston only is cylindrical-shaped structure, and described pit is arranged on the center of the end face of described piston only.
Alternatively, described pit is sphere pit.
Alternatively, the end face of the inner chamber of the cylinder body of motor, the cylinder cap being positioned at described inner chamber one end and the described piston only that is positioned at the described inner chamber the other end forms firing chamber, described cylinder cap is provided with intake duct and air outlet flue,
The end face of described piston only is provided with air inlet squish area and exhaust squish area, described air inlet squish area and described exhaust squish area are with the first lengthwise cross section of described piston only for symmetry plane is symmetrical arranged, and described air inlet squish area is communicated with described pit respectively with described exhaust squish area;
Wherein, described air inlet squish area is corresponding with the intake valve be arranged in described intake duct, and described exhaust squish area is corresponding with the exhaust valve arranged in described air outlet flue.
Alternatively, the end face of described piston only is provided with 2 protruding structures, arbitrary described protruding structure is axially symmetric structure, and symmetrical about described first lengthwise cross section, and each described protruding structure is positioned at the edge of described pit;
Described 2 protruding structures with the second lengthwise cross section of described piston only for symmetry plane is symmetrical arranged, described second lengthwise cross section is vertical and crossing with described first lengthwise cross section, and the intersection line of described second lengthwise cross section and described first lengthwise cross section is the axis of described piston only.
Alternatively, described protruding structure comprises: protruding and with the inclined-plane of described first lengthwise cross section described protruding both sides for symmetry plane is symmetricly set on,
The upper surface of described projection is plane, and the upper surface of described projection is connected with described air inlet squish area and described exhaust squish area respectively by described inclined-plane.
Alternatively, described protruding structure also comprises: intake valve valve pit and exhaust valve valve pit,
Described intake valve valve pit is arranged on the position that the first inclined-plane is connected with described air inlet squish area, and described first inclined-plane is the inclined-plane of the upper surface connecting described air inlet squish area and described projection;
Described exhaust valve valve pit is arranged on the position that the second inclined-plane is connected with described exhaust squish area, and described second inclined-plane is the inclined-plane of the upper surface connecting described exhaust squish area and described projection.
Alternatively, arbitrary described protruding structure to be positioned on described first lengthwise cross section and to be 23 millimeters to 27 millimeters away from the position of the axis of described piston only to the distance of the axis of described piston only.
Alternatively, the end face of described piston only and arbitrary described protruding structure surround closed area away from the side of described pit, and described closed area forms redundant area near extending radially outwardly 1.5 millimeters to 2.5 millimeters of end face described in the edge of the end face of described piston only.
Alternatively, the connection part smooth excessiveness of described pit and described air inlet squish area, described exhaust squish area and described protruding structure;
The equal smooth excessiveness of connection part of the connection part of the upper surface of described projection and the connection part on described inclined-plane, described first inclined-plane and described intake valve valve pit, described second inclined-plane and described exhaust valve valve pit.
The beneficial effect that technological scheme provided by the invention is brought is:
Engine piston provided by the invention, by the end face of piston only is set to plane, and pit is set at the end face of piston only, distance between the pitted surface of pit and spark plug is relatively large, the airspeed of the end face of engine piston reduces the impact of spark plug, the airspeed at spark plug place reduces, the airspeed solving spark plug place in prior art is larger, the spark ignitor early stage caused, the fiery nuclear stability of spark plug is poor, the problem that the tendency to detonate of motor is larger, reach the airspeed reducing spark plug place, stablize fiery core, reduce the effect of the tendency to detonate of motor.
Should be understood that, it is only exemplary and explanatory that above general description and details hereinafter describe, and can not limit the present invention.
Accompanying drawing explanation
In order to be illustrated more clearly in the technological scheme in the embodiment of the present invention, below the accompanying drawing used required in describing embodiment is briefly described, apparently, accompanying drawing in the following describes is only some embodiments of the present invention, for those of ordinary skill in the art, under the prerequisite not paying creative work, other accompanying drawing can also be obtained according to these accompanying drawings.
Fig. 1 is the perspective view of a kind of engine piston that the embodiment of the present invention provides;
Fig. 2 is the perspective view of the another kind of engine piston that the embodiment of the present invention provides;
Fig. 3 is the plan view of the engine piston provided embodiment illustrated in fig. 2;
Fig. 4 is the sectional view of the engine piston provided embodiment illustrated in fig. 2 along the A-A direction shown in Fig. 3;
Fig. 5 is the sectional view of the engine piston provided embodiment illustrated in fig. 2 along the B-B direction shown in Fig. 3.
Embodiment
For making the object, technical solutions and advantages of the present invention clearly, below in conjunction with accompanying drawing, embodiment of the present invention is described further in detail.
Please refer to Fig. 1, shown in it is the perspective view of a kind of engine piston 01 that the embodiment of the present invention provides.See Fig. 1, this engine piston 01 comprises: piston only 010.
The end face W of piston only 010 is plane and the end face W of piston only 010 is provided with pit 011.
Because the end face W at piston only 010 is provided with pit 011, the distance between the pitted surface of pit 011 and spark plug is relatively large, and therefore, the airspeed of the end face of engine piston 01 reduces the impact of spark plug, and the airspeed at spark plug place reduces.
In sum, the engine piston that the embodiment of the present invention provides, by the end face of piston only is set to plane, and pit is set at the end face of piston only, distance between the pitted surface of pit and spark plug is relatively large, the airspeed of the end face of engine piston reduces the impact of spark plug, the airspeed at spark plug place reduces, the airspeed solved due to spark plug place in prior art is larger, spark ignitor in earlier stage, the fiery nuclear stability of spark plug is poor, the problem that the tendency to detonate of motor is larger, reach the airspeed reducing spark plug place, stablize fiery core, reduce the effect of the tendency to detonate of motor.
Please refer to Fig. 2, shown in it is the perspective view of the another kind of engine piston 01 that the embodiment of the present invention provides.See Fig. 2, this engine piston 01 comprises: piston only 010.
The end face of piston only 010 is plane and the end face of piston only 010 is provided with pit 011.
Wherein, piston only 010 can be cylindrical-shaped structure, pit 011 can be arranged on the center of the end face of piston only 010, also be, the end face of piston only 010 can be round structure, pit 011 is arranged on the circle centre position of this round structure, and the center of pit 011 overlaps with the center of circle of this round structure.Because spark plug is arranged on position relative with the center of the end face of piston only 010 on cylinder cap usually, therefore, pit 011 is arranged on the center of the end face of piston only 010, can the airspeed of end face of more effective reduction engine piston on the impact of spark plug.
Alternatively, the round and smooth stability excessively and in order to improve spark of the end face for the ease of pit and piston only 010, pit 011 can be sphere pit.
Alternatively, the end face of piston only 010 of the inner chamber the other end of the inner chamber of the cylinder body of motor, the cylinder cap being positioned at inner chamber one end of the cylinder body of motor and the cylinder body that is positioned at motor forms firing chamber, cylinder cap is provided with intake duct and air outlet flue, the end face of piston only 010 is provided with air inlet squish area 012 and exhaust squish area 013, air inlet squish area 012 and exhaust squish area 013 with the first lengthwise cross section of piston only 010 (not shown in Fig. 2) for symmetry plane is symmetrical arranged, and air inlet squish area 012 and be vented squish area 013 and be communicated with pit 011 respectively, wherein, air inlet squish area 012 is corresponding with the intake valve be arranged in intake duct, exhaust squish area 013 is corresponding with the exhaust valve arranged in air outlet flue, when intake valve is opened, extraneous air can pass through intake duct, intake valve enters firing chamber, when IC Intake Valve Closes, when exhaust valve is opened, waste gas in firing chamber can pass through exhaust valve, discharge from air outlet flue, wherein, air inlet squish area 012 and exhaust squish area 013 all coordinate close to air inlet squish area corresponding with on cylinder cap during top dead center for moving on piston 01, pressurized gas, increase and squeeze stream, improve tubulence energy in cylinder.
Further, please continue to refer to Fig. 2, the end face of piston only 010 is provided with 2 protruding structures 014, arbitrary protruding structure 014 is axially symmetric structure, and symmetrical about the first lengthwise cross section, and each protruding structure 014 is positioned at the edge of pit 011; 2 protruding structures 014 with the second lengthwise cross section of piston only 010 (not shown in Fig. 2) for symmetry plane is symmetrical arranged, second lengthwise cross section is vertical and crossing with the first lengthwise cross section, the intersection line of the second lengthwise cross section and the first lengthwise cross section is the axis of piston only 010, and the axis of piston only 010 passes through the center of pit 011.
Alternatively, protruding structure 014 comprises: protruding 0141 and with the inclined-plane 0142 of the first lengthwise cross section protruding both sides for symmetry plane is symmetricly set on.
The upper surface of protruding 0141 can be plane, the upper surface of protruding 0141 by inclined-plane 0142 respectively with air inlet squish area 012 be vented squish area 013 and be connected.
Alternatively, protruding structure 014 also comprises: intake valve valve pit 0143 and exhaust valve valve pit 0144.
Intake valve valve pit 0143 is arranged on the position that the first inclined-plane is connected with air inlet squish area 012, and the first inclined-plane is in inclined-plane 0142, connects the inclined-plane of the upper surface of air inlet squish area 012 and projection 0141.
Exhaust valve valve pit 0144 is arranged on the position that the second inclined-plane is connected with exhaust squish area 013, and the second inclined-plane is in inclined-plane 0142, connects the inclined-plane of the upper surface of exhaust squish area 013 and protruding 0141.
Wherein, the existence of protruding structure 014 can reduce the distance between the edge of pit 011 and cylinder cap, the airspeed at protruding structure 014 top is increased, and airflow direction deflection spark plug direction, airflow direction above the pitted surface of pit 011 usually upwards, air-flow above the air-flow at protruding structure 014 top and the pitted surface of pit 011 bumps against in pit 011, and the airspeed near spark plug is reduced.
Wherein, the existence of pit 011 can also increase the tubulence energy in firing chamber, when making plug ignition, tubulence energy near spark plug increases, stablize spark, reduce coefficient of cyclic variation (English: coefficient of variation, the abbreviation: COV) of motor, reduce the tendency to detonate of motor, improve combustion efficiency.
Intake valve valve pit 0143 and exhaust valve valve pit 0144 can avoid engine piston 01 in the process of motion, and end face and the valve of piston only 010 collide.
Alternatively, the end face of piston only 010 and arbitrary protruding structure 014 surround closed area away from the side of pit 011, this closed area forms redundant area 015 near the extending radially outwardly of edge end face of the end face of piston only 010, and this redundant area 015 can be plane.Illustratively, this redundant area 015 can be that closed area becomes near the distance D-shaped that extends radially outwardly of the edge end face of the end face of piston only 010, and the span of d can be: 1.5 millimeters ~ 2.5 millimeters.
Wherein, the span of d is set to 1.5 millimeters ~ 2.5 millimeters, 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, the equal smooth excessiveness of connection part being vented squish area 013 and protruding structure 014; The equal smooth excessiveness of connection part of the connection part of the upper surface of protruding 0141 and the connection part on inclined-plane 0142, the first inclined-plane and intake valve valve pit 0143, the second inclined-plane and exhaust valve valve pit 0144.
Further, please refer to Fig. 3, shown in it is the plan view of the engine piston 01 provided embodiment illustrated in fig. 2, the structural representation of this plan view also i.e. end face of engine piston 01.See Fig. 3, the end face of piston only is plane and the end face of piston only is provided with pit 011.The end face of piston only can be round structure, and the center of circle of this round structure is o, and pit 011 can be arranged on the o place, the center of circle of this round structure, and the center of pit 011 overlaps with the center of circle o of this round structure.
See Fig. 3, the end face of piston only is also provided with air inlet squish area 012 and exhaust squish area 013, air inlet squish area 012 and exhaust squish area 013 with the first lengthwise cross section of piston only for symmetry plane is symmetrical arranged, and air inlet squish area 012 is communicated with pit 011 respectively with exhaust squish area 013, wherein, the first lengthwise cross section of piston only is for being parallel to the B-B direction shown in Fig. 3, by center of circle o and the face vertical with the end face of piston only.
See Fig. 3, the end face of piston only is provided with 2 protruding structures 014, arbitrary protruding structure 014 is axially symmetric structure, and symmetrical about the first lengthwise cross section, and each protruding structure 014 is positioned at the edge of pit 011; 2 protruding structures 014 can with the second lengthwise cross section of piston only for symmetry plane be symmetrical arranged, wherein, second lengthwise cross section of piston only is for being parallel to the A-A direction shown in Fig. 3, by center of circle o and the face vertical with the end face of piston only, second lengthwise cross section of piston only is vertical and crossing with the first lengthwise cross section, the intersection line 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, also namely, the axis of piston only is by the center of circle o shown in Fig. 3.
Wherein, protruding structure 014 comprises: protruding 0141 and with the inclined-plane 0142 of the first lengthwise cross section protruding both sides for symmetry plane is symmetricly set on, intake valve valve pit 0143 and exhaust valve valve pit 0144.
The upper surface of protruding 0141 can be plane, the upper surface of protruding 0141 can by inclined-plane 0142 respectively with air inlet squish area 012 be vented squish area 013 and be connected.Intake valve valve pit 0143 is arranged on the position that the first inclined-plane is connected with air inlet squish area 012, and the first inclined-plane is in inclined-plane 0142, connects the inclined-plane of the upper surface of air inlet squish area 012 and projection 0141; Exhaust valve valve pit 0144 is arranged on the position that the second inclined-plane is connected with exhaust squish area 013, and the second inclined-plane is in inclined-plane 0142, connects the inclined-plane of the upper surface of exhaust squish area 013 and protruding 0141.
Alternatively, the end face of piston only and arbitrary protruding structure 014 surround closed area M away from the side of pit 011, this closed area M near the end face of piston only limit m along piston only end face extend radially outwardly distance D-shaped become redundant area 015, this redundant area 015 can be plane, wherein, the span of d can be: 1.5 millimeters ~ 2.5 millimeters, and this span can make flame propagation to redundant area 015, reduces the discharge of hydrocarbon.
Alternatively, as shown in Figure 3, arbitrary protruding structure 014 to be positioned on the first lengthwise cross section and to be D away from the position of the axis of piston only to the distance of the axis of piston only, wherein, the span of D can be 23 millimeters to 27 millimeters, wherein, the span of D is set to the speed that 23 millimeters to 27 millimeters effectively can be reduced spark plug place.
Further, please refer to Fig. 4, shown in it is the sectional view of the engine piston 01 provided embodiment illustrated in fig. 2 along the A-A direction shown in Fig. 3.See Fig. 4, this engine piston 01 comprises: piston only 010.
Piston only 010 can be cylindrical-shaped structure, the end face of piston only 010 can be plane and the end face of piston only 010 is provided with pit 011, as shown in Figure 4, the round and smooth stability excessively and in order to improve spark of end face for the ease of pit and 011 piston only 010, pit 011 can be sphere pit.
The end face of piston only 010 is also provided with air inlet squish area 012 and exhaust squish area 013, air inlet squish area 012 and exhaust squish area 013 with the first lengthwise cross section of piston only 010 (not shown in Fig. 4) for symmetry plane is symmetrical arranged, wherein, first lengthwise cross section of piston only 010 is for by the axis of piston only 010 and perpendicular to the face in the paper direction shown in Fig. 4, air inlet squish area 012 is communicated with pit 011 respectively with exhaust squish area 013, and the connection part of air inlet squish area 012 and pit 011, the equal smooth excessiveness of connection part of exhaust squish area 013 and pit 011.
The end face of piston only 010 is provided with protruding structure 014, protruding structure 014 can be axially symmetric structure, and symmetrical about the first lengthwise cross section of piston only 010, protruding structure 014 can comprise: protruding 0141 and with the inclined-plane 0142 of the first lengthwise cross section protruding both sides for symmetry plane is symmetricly set on.
The upper surface of protruding 0141 can be plane, the upper surface of protruding 0141 by inclined-plane 0142 respectively with air inlet squish area 012 be vented squish area 013 and be connected, the protruding upper surface of 0141 and the connection part smooth excessiveness on inclined-plane 0142, inclined-plane 0142 and air inlet squish area 012, the equal smooth excessiveness of connection part being vented squish area 013.
Protruding structure 014 can also comprise: intake valve valve pit (not shown in Fig. 4) and exhaust valve valve pit 0144 (not shown in Fig. 4).Intake valve valve pit is arranged on the position that the first inclined-plane is connected with air inlet squish area 012, and the first inclined-plane is in inclined-plane 0142, connects the inclined-plane of the upper surface of air inlet squish area 012 and projection 0141; Exhaust valve valve pit is arranged on the position that the second inclined-plane is connected with exhaust squish area 013, and the second inclined-plane is in inclined-plane 0142, connects the inclined-plane of the upper surface of exhaust squish area 013 and protruding 0141.The equal smooth excessiveness of connection part of the connection part of the first inclined-plane and intake valve valve pit 0143, the second inclined-plane and exhaust valve valve pit 0144.
Further, please refer to Fig. 5, shown in it is the sectional view of the engine piston 01 provided embodiment illustrated in fig. 2 along the B-B direction shown in Fig. 3.See Fig. 5, this engine piston 01 comprises: piston only 010.Piston only 010 can be the different cylindrical-shaped structure of diameter, and illustratively, the diameter of piston only 010 near one end of the end face of piston only 010 is greater than the diameter of piston only 010 away from one end of the end face of piston only 010.
The end face of piston only 010 can be plane and the center of the end face of piston only 010 is provided with pit 011, the center superposition of the center of pit 011 and the end face of this piston only 010.As shown in Figure 5, the round and smooth stability excessively and in order to improve spark of the end face for the ease of pit and 011 piston only 010, pit 011 can be sphere pit.
Further, the end face of piston only 010 is provided with 2 protruding structures 014, 2 protruding structures 014 with the second lengthwise cross section of piston only 010 (not shown in Fig. 5) for symmetry plane is symmetrical arranged, wherein, wherein, second lengthwise cross section of piston only 010 is for by the axis of piston only 010 and perpendicular to the face in the paper direction shown in Fig. 5, second lengthwise cross section of piston only 010 is vertical and crossing with the first lengthwise cross section, the intersection line of the second lengthwise cross section and the first lengthwise cross section is the axis of piston only 010, the axis of piston only 010 passes through the center of pit 011.
Alternatively, protruding structure 014 comprises: protruding 0141 and with the inclined-plane 0142 of the first lengthwise cross section protruding both sides for symmetry plane is symmetricly set on.The upper surface of protruding 0141 is plane.
Alternatively, protruding structure 014 can also comprise: intake valve valve pit (not shown in Fig. 5) and (not shown in Fig. 5).
Alternatively, the end face of piston only 010 and arbitrary protruding structure 014 surround closed area away from the side of pit 011, this closed area forms redundant area 015 near the extending radially outwardly of edge end face of the end face of piston only 010, and this redundant area 015 can be plane.Illustratively, this redundant area 015 can be that closed area becomes near the distance D-shaped that extends radially outwardly of the edge end face of the end face of piston only 010, the span of d can be: 1.5 millimeters ~ 2.5 millimeters, this span can make flame propagation to redundant area 015, reduces the discharge of hydrocarbon.
In sum, the engine piston that the embodiment of the present invention provides, by the end face of piston only is set to plane, and pit is set at the end face of piston only, distance between the pitted surface of pit and spark plug is relatively large, the airspeed of the end face of engine piston reduces the impact of spark plug, the airspeed at spark plug place reduces, the airspeed solved due to spark plug place in prior art is larger, the spark ignitor early stage caused, the fiery nuclear stability of spark plug is poor, the problem that the tendency to detonate of motor is larger, reach the airspeed reducing spark plug place, stablize fiery core, reduce the effect of the tendency to detonate of motor.
The engine piston that the embodiment of the present invention provides, be particularly useful for being furnished with high tumble inlet port, the motor of high compression ratio, height rolls the motor of stream high compression ratio compared with traditional motor, its maximum feature is exactly in compression stroke, burning indoor air velocity is larger, when engine ignition, airspeed near spark plug is larger, have a strong impact on the stability of spark ignitor fiery core in early stage, easily cause catching fire, and the period of expansion of flame at spark plug, flame is serious side of being partial to firing chamber more easily, increase engine knock tendency, engine power performance is caused to decline, fuel thermal efficiency reduces, oil consumption rate increases.The engine piston that the embodiment of the present invention is provided be applied in height roll stream high compression ratio under motor, the airspeed near spark plug can be reduced, improve the tubulence energy near spark plug, thus smooth combustion fiery core in early stage, improve flame propagation, reduce engine knock, improve engine thermal efficiency.
The foregoing is only preferred embodiment of the present invention, not in order to limit the present invention, within the spirit and principles in the present invention all, any amendment done, equivalent replacement, improvement etc., all should be included within protection scope of the present invention.
Claims (10)
1. an engine piston, is characterized in that, described engine piston comprises: piston only,
The end face of described piston only is plane and the end face of described piston only is provided with pit.
2. engine piston according to claim 1, is characterized in that,
Described piston only is cylindrical-shaped structure, and described pit is arranged on the center of the end face of described piston only.
3. engine piston according to claim 1 and 2, is characterized in that,
Described pit is sphere pit.
4. engine piston according to claim 2, it is characterized in that, the end face of the inner chamber of the cylinder body of motor, the cylinder cap being positioned at described inner chamber one end and the described piston only that is positioned at the described inner chamber the other end forms firing chamber, described cylinder cap is provided with intake duct and air outlet flue
The end face of described piston only is provided with air inlet squish area and exhaust squish area, described air inlet squish area and described exhaust squish area are with the first lengthwise cross section of described piston only for symmetry plane is symmetrical arranged, and described air inlet squish area is communicated with described pit respectively with described exhaust squish area;
Wherein, described air inlet squish area is corresponding with the intake valve be arranged in described intake duct, and described exhaust squish area is corresponding with the exhaust valve arranged in described air outlet flue.
5. engine piston according to claim 4, is characterized in that,
The end face of described piston only is provided with 2 protruding structures, arbitrary described protruding structure is axially symmetric structure, and symmetrical about described first lengthwise cross section, and each described protruding structure is positioned at the edge of described pit;
Described 2 protruding structures with the second lengthwise cross section of described piston only for symmetry plane is symmetrical arranged, described second lengthwise cross section is vertical and crossing with described first lengthwise cross section, and the intersection line of described second lengthwise cross section and described first lengthwise cross section is the axis of described piston only.
6. engine piston according to claim 5, is characterized in that, described protruding structure comprises: protruding and with the inclined-plane of described first lengthwise cross section described protruding both sides for symmetry plane is symmetricly set on,
The upper surface of described projection is plane, and the upper surface of described projection is connected with described air inlet squish area and described exhaust squish area respectively by described inclined-plane.
7. engine piston according to claim 6, is characterized in that, described protruding structure also comprises: intake valve valve pit and exhaust valve valve pit,
Described intake valve valve pit is arranged on the position that the first inclined-plane is connected with described air inlet squish area, and described first inclined-plane is the inclined-plane of the upper surface connecting described air inlet squish area and described projection;
Described exhaust valve valve pit is arranged on the position that the second inclined-plane is connected with described exhaust squish area, and described second inclined-plane is the inclined-plane of the upper surface connecting described exhaust squish area and described projection.
8. engine piston according to claim 5, is characterized in that,
Arbitrary described protruding structure to be positioned on described first lengthwise cross section and to be 23 millimeters to 27 millimeters away from the position of the axis of described piston only to the distance of the axis of described piston only.
9. engine piston according to claim 5, is characterized in that,
The end face of described piston only and arbitrary described protruding structure surround closed area away from the side of described pit, and described closed area forms redundant area near extending radially outwardly 1.5 millimeters to 2.5 millimeters of end face described in the edge of the end face of described piston only.
10. engine piston according to claim 7, is characterized in that,
Described pit and described air inlet squish area, be vented the connection part smooth excessiveness of squish area and described protruding structure;
The equal smooth excessiveness of connection part of the connection part of the upper surface of described projection and the connection part on described inclined-plane, described first inclined-plane and described intake valve valve pit, described second inclined-plane and described exhaust valve valve pit.
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