CN105019998B - Engine - Google Patents
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- CN105019998B CN105019998B CN201410177640.XA CN201410177640A CN105019998B CN 105019998 B CN105019998 B CN 105019998B CN 201410177640 A CN201410177640 A CN 201410177640A CN 105019998 B CN105019998 B CN 105019998B
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Abstract
The invention discloses a kind of engine.The engine includes：Toggle, toggle includes body group, piston connecting rod unit and crankshaft-flywheel group, the bottom surface portions of the corresponding cylinder of the cylinder head of body group are formed as fovea superior structure, the middle section that the top surface of the piston of piston connecting rod unit has the shape being adapted with fovea superior structure and the top surface of piston includes first fiery pit portion and second point fiery pit portion formed with pit, pit；Spark plug, each cylinder are correspondingly arranged a spark plug；Diesel injector, each cylinder are correspondingly arranged a diesel injector, wherein spark plug corresponding to each cylinder and diesel injector are set with respect to the centerline offset of cylinder, spark plug corresponds to first fiery pit portion and diesel injector corresponds to second point fiery pit portion；And the gasoline ejector for injected petrol fuel.The engine of the present invention can form two point fire center, can improve efficiency of combustion, while the top surface line style of piston can preferably match cylinder head bottom surface.
Description
Technical field
The present invention relates to automotive field, more particularly, to a kind of engine.
Background technology
Diesel engine has that fuel economy is good, high reliability, and the use ratio more and more higher on automobile,
But the discharge of diesel engine causes detrimental effect to the air quality in city, particularly in cold-starting, discharge is worse.
The temperature of diesel car start-up period engine is relatively low, is burnt in order to stable, the fuel delivery of engine is larger, causes fuel-oil atmozation
It is bad, while exhaust temperature is not high causes Exhaust Gas Catalytic Converter for Automobiles transformation efficiency not high, further deteriorates discharge, on the one hand
Air is polluted, on the other hand adds fuel consumption during starting.Existing dual fuel engine is based on diesel engine more, combustion
Burn room and there was only an ignition center, combustion requirements can not be met well.Cylinder cover bottom surface uses planar structure simultaneously, causes piston
Compression height is larger, and piston total quality is heavier, and piston rod inertia force is big, and the work(loss of friction pair is more, reduces and starts
The power performance of machine.
The content of the invention
It is contemplated that at least solves one of above-mentioned technical problem of the prior art to a certain extent.Therefore, this hair
A bright purpose is to propose a kind of engine, the bottom surface phase that the top surface of the piston of the engine can well with cylinder head
Adaptation, so as to effectively utilize head space, make the compression height of piston reduce, the weight saving of piston, so as to reduce piston
The friction loss of connection rod set, the thermal efficiency of engine is improved, while the bowl configurations of piston can preferably match spark plug
With two incendiary sources of diesel injector, improve combustion efficiency.
Engine according to embodiments of the present invention, including：Toggle, the toggle include body
Group, piston connecting rod unit and crankshaft-flywheel group, the cylinder block of the body group is interior to have at least one cylinder, the body group
Formed with air intake duct corresponding with each cylinder and exhaust duct, the bottom surface sections of the corresponding cylinder of the cylinder head in cylinder head
Divide and be formed as fovea superior structure, the top surface of the piston of the piston connecting rod unit has the shape being adapted with the fovea superior structure and institute
State the middle section of the top surface of piston includes first fiery pit portion and second point fiery pit portion formed with pit, the pit；Spark
Plug, each cylinder are correspondingly arranged a spark plug；Diesel injector, each cylinder are correspondingly arranged described in one
Diesel injector, wherein the center of the spark plug and the relatively described cylinder of the diesel injector corresponding to each cylinder
Line biasing is set, and the spark plug corresponds to first fiery pit portion and the diesel injector corresponds to second point fiery pit portion；And use
In the gasoline ejector of injected petrol fuel.
Engine according to embodiments of the present invention, the top surface of its piston can be adapted with the bottom surface of cylinder head well,
So as to effectively utilize head space, make the compression height of piston reduce, the weight saving of piston, so as to reduce piston connecting rod unit
Friction loss, improve the thermal efficiency of engine, while the bowl configurations of piston can preferably match spark plug and diesel oil
Two incendiary sources of fuel injector, improve combustion efficiency.
In addition, engine according to embodiments of the present invention, can also have following additional technical feature：
According to some embodiments of the present invention, the centerline parallel of the center line of the diesel injector and the cylinder.
According to some embodiments of the present invention, the center line of the diesel injector and the intersection point of the bottom surface of the cylinder head
To the cylinder center line distance within 0.15D, wherein D be cylinder diameter.
According to some embodiments of the present invention, the centerline dip of the relatively described cylinder of the spark plug is set and the fire
The angle of the center line of Hua Sai center line and the cylinder is between 15 ° -25 °.
According to some embodiments of the present invention, the intersection point of the bottom surface of the center line of the spark plug and the cylinder head to institute
The distance of the center line of cylinder is stated within 0.075D.
According to some embodiments of the present invention, the center line of the diesel injector and the intersection point of the bottom surface of the cylinder head
To the cylinder center line distance within 0.1D, the intersection point of the bottom surface of the center line of the spark plug and the cylinder head
To the cylinder center line distance within 0.05D.
According to some embodiments of the present invention, the laterally vertical central cross-section of the pit is included according to the first arc section, the
Two arc sections and the changeover portion being connected between first arc section and second arc section, first arc section with
The spark plug is corresponding, and second arc section is corresponding with the diesel injector, wherein the curvature of first arc section half
Footpath is more than the radius of curvature of second arc section.
According to some embodiments of the present invention, the radius of curvature of first arc section is between 18-20mm described the
The radius of curvature of two arc sections is between 16-18mm, and the radius of curvature of the changeover portion is between 9-11mm.
According to some embodiments of the present invention, two exhaust valves are provided with the top surface of the piston and avoid recess and two
Individual inlet valve avoids recess, described two exhaust valves are avoided between recesses and described two inlet valves avoid it is logical between recess
The connection of piston circular arc camber is crossed, the exhaust valve of homonymy avoids to be connected between recess and inlet valve avoidance recess by piston inclined-plane；
And
Fovea superior structure arc section and two sections of fovea superior structure bevel phases, the fovea superior structure are configured with the fovea superior structure
Arc section is corresponding up and down with described two piston circular arc cambers respectively, two sections of fovea superior structures bevel phase respectively with it is described two
Piston inclined-plane is corresponding.
According to some embodiments of the present invention, the fovea superior structure arc section and the piston-top surface circular arc camber are corresponding same
One center of circle, the piston inclined-plane and the corresponding fovea superior structure bevel phase are parallel to each other.
Brief description of the drawings
Fig. 1 is that an edge of body group part according to embodiments of the present invention is orthogonal to bent axle axial direction and passes through cylinder axis
The vertical section figure of line；
Fig. 2 is the partial enlarged drawing in Fig. 1；
Fig. 3 is a longitudinal cross-section partial schematic diagram of body group part according to embodiments of the present invention；
Fig. 4 is the stereogram of piston；
Fig. 5 is the location diagram between diesel injector, spark plug and cylinder centerline.
Embodiment
Embodiments of the invention are described below in detail, the example of the embodiment is shown in the drawings, wherein from beginning to end
Same or similar label represents same or similar element or the element with same or like function.Below with reference to attached
The embodiment of figure description is exemplary, it is intended to for explaining the present invention, and is not considered as limiting the invention.
In the description of the invention, it is to be understood that term " " center ", " longitudinal direction ", " transverse direction ", " length ", " width ",
" thickness ", " on ", " under ", "front", "rear", "left", "right", " vertical ", " level ", " top ", " bottom " " interior ", " outer ", " up time
The orientation or position relationship of the instruction such as pin ", " counterclockwise " are based on orientation shown in the drawings or position relationship, are for only for ease of
Description is of the invention to be described with simplified, rather than the device or element of instruction or hint meaning must be with specific orientation, Yi Te
Fixed azimuth configuration and operation, therefore be not considered as limiting the invention.
In addition, term " first ", " second " are only used for describing purpose, and it is not intended that instruction or hint relative importance
Or the implicit quantity for indicating indicated technical characteristic.Thus, define " first ", the feature of " second " can be expressed or
Implicitly include one or more this feature.In the description of the invention, " multiple " are meant that at least two, such as two
It is individual, three etc., unless otherwise specifically defined.
In the present invention, unless otherwise clearly defined and limited, term " installation ", " connected ", " connection ", " fixation " etc.
Term should be interpreted broadly, for example, it may be fixedly connected or be detachably connected, or integrally；Can be that machinery connects
Connect or electrically connect；Can be joined directly together, can also be indirectly connected by intermediary, can be in two elements
The connection in portion or the interaction relationship of two elements.For the ordinary skill in the art, can be according to specific feelings
Condition understands the concrete meaning of above-mentioned term in the present invention.
In the present invention, unless otherwise clearly defined and limited, fisrt feature second feature it " on " or it " under "
Can directly it be contacted including the first and second features, it is not directly to contact but pass through it that can also include the first and second features
Between other characterisation contact.Moreover, fisrt feature second feature " on ", " top " and " above " to include first special
Sign is directly over second feature and oblique upper, or is merely representative of fisrt feature level height and is higher than second feature.Fisrt feature exists
Second feature " under ", " lower section " and " following " fisrt feature that includes are immediately below second feature and obliquely downward, or be merely representative of
Fisrt feature level height is less than second feature.
Engine according to embodiments of the present invention is described in detail below with reference to Fig. 1-Fig. 5.
Engine typically can include valve actuating mechanism, toggle, feed system, ignition system, cooling system and
Lubricating system etc..
Wherein, the function of toggle is the power that combustion gas is acted on piston 3 to be changed into the torque of bent axle, with to
Work mechanism output mechanical energy.Usually, toggle mainly includes piston connecting rod unit, crankshaft-flywheel group and body
Group.
The reciprocating motion of piston 3 is changed into the rotary motion of bent axle by piston connecting rod unit, while will act on piston 3
Power is changed into the torque that bent axle externally exports, so as to drive the vehicle wheel rotation of vehicle.Usually, piston connecting rod unit include piston 3,
Piston ring, piston pin and connecting rod etc., piston pin are used to connect piston 3 and connecting rod.Crankshaft-flywheel group is mainly by bent axle and flywheel structure
Into.
Body group is the support of engine, is piston connecting rod unit, crankshaft-flywheel group, valve actuating mechanism and each system master of engine
Want the assembling matrix of part.As shown in figure 1, body group mainly includes cylinder head 1, cylinder head gasket, cylinder block 2 and oil sump,
Cylinder head 1 is located at the top surface of cylinder block 2, and cylinder head gasket is folded between the bottom surface of cylinder head 1 and the top surface of cylinder block 2, uses
Gap between blanket gas cylinder cap 1 and cylinder block 2, oil sump are arranged on the bottom of cylinder block 2.In the description of the invention,
The longitudinal direction of engine (or body group) refers to the length direction of engine, and the transverse direction of engine (or body group) refers to starting
Thickness (width) direction of machine, the short transverse of engine (or body group) refer to the direction of the center line parallel to cylinder.
Cylinder block 2 has at least one cylinder, and cylinder is to move the cylindrical cavity being oriented to wherein for piston 3,
Cylinder is typically incorporated in the first half of cylinder block 2, and the lower half of cylinder block 2 typically can be crankcase, but not limited to this.It is right
For straight engine, its multiple cylinder is juxtaposed along the longitudinal centre line of engine, i.e., multiple cylinders are along engine
Longitudinal arrangement is in alignment.For V-type motor, it is generally divided into two groups of cylinders, the angle between two groups of cylinders
Typically between 30 ° -60 °, but not limited to this.
Formed with air intake duct corresponding with each cylinder and exhaust duct in cylinder head 1, air intake duct is used to convey to combustion chamber
Gas mixture (or air), exhaust duct are used to discharge waste gas.Usually, Two In and Two Out air flue form can be used, that is, is entered
Air flue and exhaust duct are two, but not limited to this, such as can also enter scene 2 or one-in-and-one-out using three, for this area
, can be according to being actually needed and the internal structure of cylinder head 1 and adaptive settings for those of ordinary skill.
Valve actuating mechanism is arranged in cylinder head 1, and the effect of valve actuating mechanism is according to the work carried out in each cylinder of engine
Make circulation and the requirement of firing order, time opening and close inlet valve and exhaust valve, make fresh momentum (such as air-fuel mixture
Thing or air) enter in time in cylinder, and waste gas is discharged from cylinder in time.
Valve actuating mechanism mainly includes valve group and valve transmission group part, and valve group generally comprises air inlet side valve (referred to as
Inlet valve) and exhaust side valve (abbreviation exhaust valve), inlet valve and exhaust valve can pass through single camshaft actuated respectively
Its timing is opened, closed.Camshaft can link with the bent axle of engine, gear can be used to pass between camshaft and engine
The various ways such as dynamic, Chain conveyer or V belt translation.
Wherein, for four-stroke engine, each cylinder at least corresponds to an inlet valve and an exhaust valve, typically
Ground, the quantity of inlet valve and the quantity of air intake duct are identicals, and the quantity of exhaust valve and the quantity of exhaust duct are identicals.Example
Such as, Two In and Two Out Four valve structure can be used, or three enter the air valve structure of scene 2 five, naturally it is also possible to using one-in-and-one-out two
Air valve structure.Inlet valve and exhaust valve in each combustion chamber are by the driving of corresponding camshaft so as to be circulated according to certain rule
Open, so as to fill into gas mixture (or fresh air) into combustion chamber in time, and in time by waste gas after work done of burning
Discharge.
The function of spark plug 5 is that high-tension electricity caused by ignition coil is introduced into combustion chamber, and is produced between two electrodes
Electric spark, so as to light combustion mixture, spark plug 5 mainly can be by groups such as central electrode, lateral electrode, housing and insulators
Into.In some embodiments of the invention, each cylinder is correspondingly arranged a spark plug 5, and the spark plug 5 can use screw thread
The mode of connection is fixed on the corresponding position of cylinder head 1.
Gasoline ejector is used for injected petrol fuel, in an embodiment of the present invention, the specific setting to gasoline ejector
Position is not particularly limited.For example, gasoline ejector can be one-to-one (that is, multi-point injection) with the quantity of cylinder, vapour
Oily fuel injector can be arranged in cylinder head 1 and can directly inject fuel into the front of the inlet valve of corresponding cylinder.Certainly, one
Gasoline ejector can also correspond to multiple cylinders (that is, single point injection), and the fuel injector may be mounted in the section before air throttle,
Fuel can enter in air intake branch after spraying into air stream, and be respectively allocated to each cylinder.
Diesel injector 4 is used to spray diesel fuel, and diesel injector 4 can be arranged in cylinder head 1, diesel injector
4 nozzle segment can be located in corresponding combustion chamber.In some embodiments of the invention, each cylinder is correspondingly arranged one
Diesel injector 4.
It should be appreciated that on the specific configuration of diesel injector 4 and gasoline ejector, operation principle and correlation
Oil supply system etc., for prior art and be well known for ordinary skill in the art, therefore no longer go to live in the household of one's in-laws on getting married one by one here
State.
Wherein, a gasoline ejector and a diesel oil oil spout are corresponded to as optional embodiment, each combustion chamber
Device 4, and a gasoline ejector and a diesel injector 4 can be integrated into an entirety, a monoblock type oil spout
Device can have a nozzle, and injected petrol is used for when needing injected petrol, and then be used to spray when needing to spray diesel oil
Diesel oil.Or a unit injector can also have two nozzles, one is used for injected petrol, and another is used to spray
Diesel oil, two nozzles are non-interference.In these embodiments, the Fuel Petroleum that gasoline ejector sprays is to be injected directly into burning
Indoor, and without air intake branch or air intake duct, the setting of multi-point injection and single point injection with above-mentioned gasoline ejector
Mode is different.
It is used to spray the diesel injector 4 of diesel oil and for spraying because engine according to embodiments of the present invention has
The gasoline ejector of gasoline, therefore engine according to embodiments of the present invention can also be referred to as gasoline, diesel dual fuel engine
(abbreviation dual fuel engine).
Dual fuel engine according to embodiments of the present invention, when starting engine, can be ignited mode by spark plug 5
Carry out ignition start.And after dual fuel engine normal starting, it can be worked by spraying diesel oil in a manner of compression ignition, it is now fiery
Flower plug 5 can be stopped.So as to which so that dual fuel engine according to embodiments of the present invention is compared to diesel engine,
Discharge can be effectively reduced during starting, can be with by ignition way the problem of especially for diesel engine cold-starting difficulty
Smoothly start.After dual fuel engine according to embodiments of the present invention starts, spark plug 5 can be substituted by compression ignition mode
Ignition way, thus high compression ratio help fully to burn, improve the fuel economy and power output performance of engine.
In addition, spark plug 5 can stop work when engine according to embodiments of the present invention is due to normal work stroke cycle
Make, spark plug 5 only can be lighted a fire when starting, therefore can greatly reduce the ignition times of spark plug 5, improve spark plug
5 service life, use cost is reduced, while also simplify control strategy.
However, it is desirable to explanation, the above-mentioned starting process on dual fuel engine according to embodiments of the present invention with
And normal stroke circulation is only schematically to illustrate, it is impossible to is not understood as limiting a kind of of the present invention, or implies the present invention
Engine be only capable of starting in the above described manner or more and state the work of mode normal circulation.
Shown in reference picture 1 and Fig. 3, the bottom surface of cylinder head 1 according to embodiments of the present invention uses nonplanar structure, it is specific and
Speech, the bottom surface portions of the corresponding cylinder of cylinder head 1 are formed with fovea superior structure 13, in other words, by taking four cylinders of array as an example, the cylinder
The bottom surface of lid 1 can have four fovea superior structures 13, the corresponding cylinder of each fovea superior structure 13.
Thus, due to using nonplanar structure, being different from the flat-bottom structure of conventional diesel, therefore according to the present invention
The engine of embodiment can be based on petrol engine, i.e., transformed using petrol engine as prototype.
" it is every that fovea superior structure 13 " can use in conventional gasoline machine the bottom surface of cylinder head 1 correspond to it is understood that above-mentioned
The fovea superior structure type of individual cylinder.Here for fovea superior structure 13 and it is not particularly limited.
Further, the top surface of piston 3 has the shape being adapted with fovea superior structure 13.Here, it is necessary to explanation, piston
3 top surface is adapted with the shape of fovea superior structure 13 can be understood as the line style of the two and is identical or is substantially the same, such as living
The top surface of plug 3 can have circular arc camber, then the corresponding part of fovea superior structure 13 is again formed as circular arc camber, and this corresponds to each other
The radius of curvature of two circular arc cambers can be equal or of substantially equal, and and for example the top surface of piston 3 can also form beveled region, then
The corresponding part of fovea superior structure 13 is again formed as beveled region, and two beveled regions to correspond to each other can be parallel or substantially parallel
's.
Because the bottom surface of cylinder head 1 according to embodiments of the present invention is non-flat-bottom structure, i.e., using upper female type (corresponding gas
Cylinder part), therefore piston 3 easily interferes in top dead centre with valve, may cause valve actuating mechanism can not normal work, enter
And valve is caused normally to open and close.
In view of this, according to some embodiments of the present invention, the avoidance for avoiding valve is provided with the top surface of piston 3
Recess.Specifically, such as Fig. 4 and with reference to shown in Fig. 1 and Fig. 3, two exhaust valves is provided with the top surface of piston 3 and avoid recess 35
Recess 36 is avoided with two inlet valves, two exhaust valves are connected by piston circular arc camber 34 between avoiding recess 35, that is, connected
Between two exhaust valves avoid recess 35 is a circular arc camber.Similarly, between two inlet valves avoidance recesses 36
Connected by piston circular arc camber 34, that is, be connected to two inlet valves and avoid between a recesses 36 and circular arc camber, and
And two circular arc cambers can be symmetrical structure.
Further, the exhaust valve of homonymy avoids is connected between recess 35 and inlet valve avoidance recess 36 by piston inclined-plane 32
Connect.In other words, such as Fig. 4 and with reference to shown in Fig. 1, the exhaust valve positioned at left side avoids recess 35 and avoided with the inlet valve positioned at left side
Recess 36 is by a ramp structure (that is, piston inclined-plane 32) transition, similarly, the exhaust valve positioned at right side avoid recess 35 with
Inlet valve positioned at right side avoids recess 36 also by a ramp structure (that is, piston inclined-plane 32) transition, two inclined-plane knots
Structure can also be symmetrical structure.
Accordingly, as shown in figures 1 and 3, fovea superior structure arc section 12 and two sections of fovea superiors are configured with fovea superior structure 13
Structure bevel phase 11, wherein fovea superior structure arc section 12 and two piston circular arc cambers are corresponding about 34.
As shown in figure 1, a fovea superior structure bevel phase 11 avoids recess 35 with the exhaust valve positioned at left side and is located at left side
The inlet valve piston inclined-plane that avoids between recess 36 corresponded to about 32, another fovea superior structure bevel phase 11 with positioned at right side
Exhaust valve avoid recess 35 with positioned at the inlet valve on right side avoid recess 36 between piston inclined-plane about 32 it is corresponding.
Thus, the top surface of piston 3 can be engaged with fovea superior structure 13 well, effectively using head space, make piston 3
Compression height reduces, and the weight saving of piston 3, so as to reduce the friction loss of piston connecting rod unit, improves the heat of engine
Efficiency.
As preferred embodiment, the 12 same center of circle corresponding with piston circular arc camber 34 of fovea superior structure arc section, i.e., two
The radius of curvature of person is equal.Similarly, piston inclined-plane 32 and corresponding fovea superior structure bevel phase 11 are parallel to each other.As a result,
The top surface of piston 3 preferably coordinates with fovea superior structure 13, so as to further reduce the compression height of piston 3, improves the heat of engine
Efficiency.
With reference to shown in Fig. 1 and Fig. 4, for the middle section of the top surface of piston 3 formed with pit 31, pit 31 includes the first igniting
Hole portion 311 and second point fiery pit portion 312, as a result, combustion chamber can form two ignition centers, make fuel in combustion process
In can shorten flame travel, improve the burning velocity of fuel, avoid the generation of pinking and the generation of soot, improve combustion
Specific oil consumption.As shown in figure 1, spark plug 5 uses offset cylinder center line A (Fig. 5) arrangement with diesel injector 4,
That is the center line of spark plug 5 with the center line A of corresponding cylinder is misaligned, similarly, the center line of diesel injector 4 with it is right
It is also misaligned to answer the center line A of cylinder.Wherein, the corresponding first fiery pit portion 311 of spark plug 5 and the correspondence of diesel injector 4
Second point fiery pit portion 312, so that spark plug 5 preferably two ignition centers can be adapted to diesel injector 4, it can shorten
Flame transmission distance, ensure fuel atomizing effect, reduce the tendency that detonation occurs, improve the efficiency of combustion of engine.
In some embodiments of the invention, the centerline parallel of the center line of diesel injector 4 and cylinder, i.e. diesel oil spray
Cylinder is set corresponding to oily device 4 is orthogonal.Further, as shown in figure 5, the center line of diesel injector 4 and the bottom surface of cylinder head 1
Intersection point to the center line L2 of cylinder distance within 0.15D, i.e. L2≤0.15D, preferably within 0.1D.Wherein D is cylinder
Diameter (internal diameter), as shown in Figure 1.
For example, in one embodiment, cylinder bore D can be 80mm or so, the center line and cylinder head of diesel injector 4
The intersection point of 1 bottom surface to the center line A of cylinder distance about in 10mm or so, still, the present invention is not limited thereto.
Thus, diesel injector 4 is arranged close to center line so that diesel oil oil beam can relatively evenly divide in combustion chamber
Cloth, reduce each oily Shu Changdu and differ and cause gaseous mixture lack of homogeneity, so as to improve burning.
In one embodiment, the intersection point of the bottom surface of the center line of spark plug 5 and cylinder head 1 is to the center line A's of cylinder
Distance is within 0.075D, i.e. L1≤0.075D, preferably within 0.05D.
Such as in one embodiment, cylinder bore D can be 80mm, the center line of spark plug 5 and the bottom surface of cylinder head 1
The distance of intersection point to center line can be about 4mm or so, and still, the present invention is not limited thereto.
In short, in some preferred embodiments, the center line of spark plug 5 and the intersection point of the bottom surface of cylinder head 1 to gas
Distance of the cylinder center line A distance compared to the center line of diesel injector 4 and the intersection point of the bottom surface of cylinder head 1 to cylinder centerline A
It is near.As a result, the arrangement of spark plug 5 and diesel injector 4 is compacter, the free space in cylinder head 1 is made full use of,
It can also preferably coordinate simultaneously with two ignition centers, improve combustion efficiency.
Inventor has found that for conventional engines, its spark plug 5 is typically centrally arranged, and the center line of spark plug 5
Overlapped with the center line of cylinder.And the biasing of spark plug 5 is set in the application, therefore the setting angle of spark plug 5 is to area of flame
Spreading rate and burn rate can produce certain influence.
Inventor has found that this case can be improved by being obliquely installed spark plug 5, therefore in one embodiment of the present of invention
In, spark plug 5 is obliquely installed relative to cylinder corresponding to the spark plug 5, i.e. the center line of spark plug 5 and the center line of cylinder is
Not parallel, as shown in Figure 5.
Further, in certain embodiments, as shown in figure 5, the folder of the center line of spark plug 5 and the center line of corresponding cylinder
Angle α is between 15 ° -25 °.Thus, it is possible to improve area of flame spreading rate and burn rate, balanced flame travel,
Early combustion is effectively avoided, while is also convenient for engine and cleans waste gas, preferably improves ignition difficulties problem.
As preferred embodiment, the center line of spark plug 5 is with the angle α of the center line of corresponding cylinder at 18 ° -22 °
Between.Thus, not only it is possible to prevente effectively from liquid fuel collision spark plug 5 and to spark plug 5 supply overrich gaseous mixture and
Form carbon distribution on spark plug 5, while beneficial to improving area of flame spreading rate and burn rate, balanced flame propagation away from
From so as to preferably avoid early combustion.
Because diesel injector 4 and spark plug 5 bias setting, therefore second point fiery pit corresponding with diesel injector 4
Portion 312 and having with the line style in 5 corresponding first fiery pit portions 311 of spark plug on efficiency of combustion significantly affects.
In one embodiment, as shown in Fig. 2 the laterally vertical central cross-section of pit 31 includes the first arc section 331, the
Two arc sections 332 and the changeover portion 333 being connected between the first arc section 331 and the second arc section 332.Wherein, here
" laterally vertical central cross-section " refers to the center line A by corresponding cylinder and is orthogonal to the vertical section of bent axle axial direction.
First arc section 331 is corresponding with spark plug 5, and the second arc section 332 is corresponding with diesel injector 4, wherein the first circle
Segmental arc 331 is the line style at the center of first fiery pit portion 311, and the second arc section 332 is the line at the center of second point fiery pit portion 312
Type.As preferred embodiment, the radius of curvature r1 of the first arc section 331 is more than the radius of curvature r2 of the second arc section 332.
Inventor has found that the line style parameter of the first arc section 331, the second arc section 332 and changeover portion 333 is directly connected to
The thermal efficiency of engine and the performance of engine, therefore reasonable design three sections of the line style passes for efficiency of combustion, flame
Broadcasting distance, burning velocity and pinking situation has direct relation.
In view of this, inventor has found, by the way that the radius of curvature r1 of the first arc section 331 is arranged into 18-20mm, second
The radius of curvature r2 of arc section 332 is arranged to 16-18mm, and the radius of curvature r3 of changeover portion 333 is arranged to 9-11mm, so that
Two fiery pits portion (i.e. two ignition centers) can effectively shorten flame travel in fuel combustion process, improve fuel
Burning velocity, avoid the generation of pinking and the generation of soot, and be preferably adapted to two incendiary sources, improve fuel consumption.
Wherein, in an optional embodiment, changeover portion 333 can use 10mm or so circular arc to carry out transition.
Generally speaking, engine according to embodiments of the present invention, by the way that the top surface of piston 3 is designed as and fovea superior structure 13
It is adapted so that engine according to embodiments of the present invention has a high compression ratio of similar diesel engine, shape on the pit 31 of piston 3
Into there are two ignition centers, the need for using 4 two incendiary sources of spark plug 5 and diesel injector respectively under different operating modes are ensure that
Ask, flame transmission distance can be shortened, ensure fuel atomizing effect, reduce the tendency that detonation occurs, while piston 3 is well
The fovea superior structure 13 of cylinder head 1 is make use of, the top surface of piston 3 is protruded the bottom surface of cylinder block 2 and (removes its of fovea superior structure 13
Remaining part point), make the compression height relative reduction of piston 3, effectively reduce the overall dimensions of piston 3, make the quality of piston 3 more
Close to gasoline engine, while the reciprocal inertia force of piston crank mechanism is further reduced, make the frictional work of engine further
Reduce, effectively raise the thermal efficiency of engine, reduce emission effect.
In the description of this specification, reference term " one embodiment ", " some embodiments ", " example ", " specifically show
The description of example " or " some examples " etc. means specific features, structure, material or the spy for combining the embodiment or example description
Point is contained at least one embodiment or example of the present invention.In this manual, to the schematic representation of above-mentioned term not
Identical embodiment or example must be directed to.Moreover, specific features, structure, material or the feature of description can be with office
What combined in an appropriate manner in one or more embodiments or example.In addition, those skilled in the art can say this
Different embodiments or example described in bright book are engaged and combined.
Although embodiments of the invention have been shown and described above, it is to be understood that above-described embodiment is example
Property, it is impossible to limitation of the present invention is interpreted as, one of ordinary skill in the art within the scope of the invention can be to above-mentioned
Embodiment is changed, changed, replacing and modification.
Claims (8)
- A kind of 1. engine, it is characterised in that including：Toggle, the toggle include body group, piston connecting rod unit and crankshaft-flywheel group, the body There is at least one cylinder in the cylinder block of group, the bottom surface portions of the corresponding cylinder of the cylinder head of the body group are formed as fovea superior Structure, the top surface of the piston of the piston connecting rod unit have the top surface of the shape being adapted with the fovea superior structure and the piston Middle section include first fiery pit portion and second point fiery pit portion formed with pit, the pit；Spark plug, each cylinder are correspondingly arranged a spark plug；Diesel injector, each cylinder are correspondingly arranged a diesel injector, wherein corresponding to each cylinder The centerline offset of the spark plug and the relatively described cylinder of the diesel injector is set, and described in spark plug correspondence First fiery pit portion and the diesel injector correspond to second point fiery pit portion；AndGasoline ejector for injected petrol fuel；The laterally vertical central cross-section of the pit includes according to the first arc section, the second arc section and is connected to first circle Changeover portion between segmental arc and second arc section, first arc section is corresponding with the spark plug, second circular arc Section is corresponding with the diesel injector, wherein the radius of curvature of first arc section is more than the curvature half of second arc section Footpath；The radius of curvature of first arc section is that the radius of curvature of second arc section is in 16-18mm between 18-20mm Between, the radius of curvature of the changeover portion is between 9-11mm.
- 2. engine according to claim 1, it is characterised in that the center line of the diesel injector and the cylinder Centerline parallel.
- 3. engine according to claim 2, it is characterised in that the center line of the diesel injector and the cylinder head Bottom surface intersection point to the center line of the cylinder distance within 0.15D, wherein D be cylinder diameter.
- 4. engine according to claim 3, it is characterised in that the centerline dip of the relatively described cylinder of the spark plug Set and the angle of the center line of the center line of the spark plug and the cylinder is between 15 ° -25 °.
- 5. engine according to claim 4, it is characterised in that the center line of the spark plug and the bottom of the cylinder head The intersection point in face to the center line of the cylinder distance within 0.075D.
- 6. engine according to claim 5, it is characterised in that the center line of the diesel injector and the cylinder head Bottom surface intersection point to the center line of the cylinder distance within 0.1D, the center line of the spark plug and the cylinder head Bottom surface intersection point to the center line of the cylinder distance within 0.05D.
- 7. engine according to claim 1, it is characterised in that two exhaust valves are provided with the top surface of the piston and are kept away Allow recess and two inlet valves avoid recesses, described two exhaust valves are avoided between recesses and described two inlet valves avoid Connected between recess by piston circular arc camber, the exhaust valve of homonymy avoids passes through work between recess and inlet valve avoidance recess Fill in inclined-plane connection；AndFovea superior structure arc section and two sections of fovea superior structure bevel phases, the fovea superior structure circular arc are configured with the fovea superior structure Section it is corresponding up and down with described two piston circular arc cambers respectively, two sections of fovea superior structures bevel phase respectively with described two pistons Inclined-plane is corresponding.
- 8. engine according to claim 7, it is characterised in that the fovea superior structure arc section is bent with the piston circular arc Face corresponds to the same center of circle, and the piston inclined-plane and the corresponding fovea superior structure bevel phase are parallel to each other.
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| CN201410177640.XA CN105019998B (en) | 2014-04-29 | 2014-04-29 | Engine |
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| CN201410177640.XA CN105019998B (en) | 2014-04-29 | 2014-04-29 | Engine |
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| CN105019998B true CN105019998B (en) | 2018-03-06 |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN107355297B (en) * | 2017-07-31 | 2022-12-09 | 天津大学 | Engine combustion chamber suitable for gasoline fuel combustion instead of diesel engine |
| CN114165352A (en) * | 2021-12-17 | 2022-03-11 | 中国船舶重工集团公司第七一一研究所 | Piston, combustion chamber assembly and method of organizing combustion |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0839997A1 (en) * | 1996-10-31 | 1998-05-06 | Fuji Jukogyo Kabushiki Kaisha | Combustion chamber structure having piston cavity |
| US6095114A (en) * | 1998-05-11 | 2000-08-01 | Honda Giken Kogyo Kabushiki Kaisha | Gasoline direct-injection engine |
| CN101413422A (en) * | 2008-11-28 | 2009-04-22 | 江苏大学 | Direct spraying natural gas two-air valve engine underpressure layered combustion chamber structure in cylinder |
| CN103696847A (en) * | 2012-09-28 | 2014-04-02 | 重庆长安汽车股份有限公司 | In-cylinder direct injection engine combustion chamber |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP3781536B2 (en) * | 1997-12-17 | 2006-05-31 | 富士重工業株式会社 | Combustion chamber structure of in-cylinder injection engine |
| JP2001193512A (en) * | 2000-01-11 | 2001-07-17 | Hiromasa Kitaguchi | Engine having functions of gasoline and diesel |
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- 2014-04-29 CN CN201410177640.XA patent/CN105019998B/en active Active
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0839997A1 (en) * | 1996-10-31 | 1998-05-06 | Fuji Jukogyo Kabushiki Kaisha | Combustion chamber structure having piston cavity |
| US6095114A (en) * | 1998-05-11 | 2000-08-01 | Honda Giken Kogyo Kabushiki Kaisha | Gasoline direct-injection engine |
| CN101413422A (en) * | 2008-11-28 | 2009-04-22 | 江苏大学 | Direct spraying natural gas two-air valve engine underpressure layered combustion chamber structure in cylinder |
| CN103696847A (en) * | 2012-09-28 | 2014-04-02 | 重庆长安汽车股份有限公司 | In-cylinder direct injection engine combustion chamber |
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Effective date of registration: 20201223 Address after: No.868, Gangxing Road, Yangzhong Economic Development Zone, Yangzhong City, Zhenjiang City, Jiangsu Province, 212200 Patentee after: Honeycomb power system (Jiangsu) Co.,Ltd. Address before: 071000 No. 2266 Chaoyang South Street, Hebei, Baoding Patentee before: Great Wall Motor Co.,Ltd. |
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