CN209398492U - A kind of low-loss diesel combustion cell structure - Google Patents
A kind of low-loss diesel combustion cell structure Download PDFInfo
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- CN209398492U CN209398492U CN201821711183.8U CN201821711183U CN209398492U CN 209398492 U CN209398492 U CN 209398492U CN 201821711183 U CN201821711183 U CN 201821711183U CN 209398492 U CN209398492 U CN 209398492U
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- water conservancy
- conservancy diversion
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
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- Y02T10/10—Internal combustion engine [ICE] based vehicles
- Y02T10/12—Improving ICE efficiencies
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Abstract
A kind of low-loss diesel combustion cell structure, including cylinder piston, the top of the cylinder piston coaxially offer the slope water conservancy diversion conical surface and lower vortex groove；Water conservancy diversion step surface is provided between lower vortex groove and the slope water conservancy diversion conical surface, the angle α between water conservancy diversion step surface and the slope water conservancy diversion conical surface is 120o-165o；Angle between the water conservancy diversion step surface and the top surface of cylinder piston is 0o-30o；The outside of lower vortex groove offers vortex groove at the top of the cylinder piston, and projection width H of the water conservancy diversion step surface on the top surface of cylinder piston is 1mm-6mm；The slope water conservancy diversion conical surface is connected by the first water conservancy diversion arcs with the inner periphery of water conservancy diversion step surface, and the excircle of the water conservancy diversion step surface is connected by the second water conservancy diversion arcs with lower vortex groove.The design can not only make fuel oil and flame to the extension of the middle part of combustion chamber, make fuel oil full combustion, and make the high-temperature area of piston base to the mobile thermic load for reducing combustion chamber and heat transfer loss in the middle part of combustion chamber.
Description
Technical field
The utility model relates to engine art more particularly to a kind of low-loss diesel combustion cell structures, specific to be applicable in
In reducing heat transfer loss in cylinder, improves engine thermal efficiency, improves fuel economy.
Background technique
It is higher and higher to the economy emission request of diesel engine with the upgrading of fuel price rise and emission regulation.Combustion
Burn a key components and parts of the room as diesel engine, combustion-chamber shape to the formation of diesel engine In Cylinder Flow, gaseous mixture and
Burning has great influence.Promote by chamber structure optimization oil, gas to be sufficiently mixed, and improves air utilization ratio, it is right
Improve the diesel engine thermal efficiency, improvement fuel power and economy, reduction discharge is of great significance.
Modern direction-injection diesel engine combustion chamber is usually the combustion chamber of ω shape, by combustion chamber throat, central boss, combustion chamber
Circular arc composition.The most salient point of the aditus laryngis of such combustion chamber forms the line of demarcation parallel with cylinder centerline, by ω shape combustion chamber
It is divided into the groove area on top and the regular zone of lower part.In actual application, the shunting function of aditus laryngis can be by fuel oil one
Part branches to groove area upwards, is vortexed in formation；Another part branches to downwards regular zone, forms lower vortex.Pass through vortex
Involving velocity promote the air-fuel mixture in cylinder, can be effectively reduced soot emissions.
Conventional diesel combustion room is limited by self structure, and there are still many flaws: combustion chamber regular zone volumetric ratio is recessed
Slot area volume is much larger, but the air among conventional area combustion is not utilized more fully, and diesel oil fires in combustion chamber
Burning is concentrated mainly at piston crater, and piston heat load remains unchanged higher；The lower vortex for flowing through combustion recess does not obtain abundant benefit
With heat loss at piston cannot be effectively reduced to improve the thermal efficiency of diesel engine, improve oil consumption.
Chinese patent notification number is CN101952567A, and the day for announcing is that the patent of invention on January 19th, 2011 discloses one
Kind be used for internal combustion engine especially diesel engine piston, including the piston body laterally defined by skirt section, the piston physical efficiency with have
The wall of the cylinder of axis of rotation C cooperates, which can slide along the axis C in the cylinder, and the piston includes front surface,
The front surface includes center protrusion, peripheral coronary ring and the bowl portion with axis of rotation B, and axis of rotation B is from the center protrusion
The peripheral coronary ring being connected at the lips with a thickness of Ep with the center protrusion is stretched to, the bowl portion includes substantially across the lip
The anchor ring in shape portion, the anchor ring are preferably semi-arched profile and have maximum radius Rt, which can will be ejected under the lips
The fuel of recessed area R guide the center protrusion into, which has separated ramp and lower inclined plane, ramp ratio
Lower inclined plane is gentler.Although the invention can make the discharge for reducing nitrogen oxides and particulate matter, there are still following defects for it:
In the invention to hit wall shunting effect unobvious, fuel oil is concentrated mainly on regular zone, squish flow area air utilization ratio compared with
Difference, lower inclined plane are bigger than the slope of ramp, and such structural gap utilization rate does not improve, and be unfavorable for fuel oil and flame to
Combustion chamber Center Extender causes fuel oil accumulation in bowl portion, be easy to cause fuel burning insufficient, increases the discharge of soot, simultaneously
Thermic load and the heat transfer loss of combustion chamber are increased, the thermal efficiency of diesel engine is reduced.
Summary of the invention
The purpose of the utility model is to overcome the thermic load of combustion chamber existing in the prior art and heat transfer loss asking greatly
Topic provides the low-loss diesel combustion cell structure of a kind of thermic load for reducing combustion chamber and heat transfer loss.
In order to achieve the above object, the technical solution of the utility model is:
A kind of low-loss burning chamber of diesel engine, including cylinder piston are coaxially provided with slope at the top of the cylinder piston and lead
Flow cone face and lower vortex groove；
Water conservancy diversion step surface is provided between the lower vortex groove and the slope water conservancy diversion conical surface, the water conservancy diversion step surface is led with slope
Angle α between flow cone face is 120 degree of -165 degree.
Angle between the water conservancy diversion step surface and cylinder piston top surface is 0 degree of -30 degree.
Spherical crown boss, the bottom of the slope water conservancy diversion conical surface and spherical crown boss are provided at the top of the slope water conservancy diversion conical surface
Cambered surface is tangent, and the spherical radius where the spherical crown boss is 6mm-20mm.
Vortex groove is offered at the top of the cylinder piston, the upper vortex groove and lower vortex groove are coaxially disposed.
The upper vortex groove passes sequentially through third water conservancy diversion arcs, water conservancy diversion straight wall is connected with lower vortex groove, the water conservancy diversion straight wall
For the circumferential wall perpendicular to cylinder piston top surface, the lower end of the water conservancy diversion straight wall and the outside cambered surface of lower vortex groove are tangent, described
The upper end of water conservancy diversion straight wall and the inside cambered surface of third water conservancy diversion arcs are tangent, the outside cambered surface of the third water conservancy diversion arcs and upper vortex groove bottom
Portion's cambered surface is tangent.
Maximum distance is V1, the water conservancy diversion step surface and cylinder piston between the lower vortex groove and cylinder piston top surface
Between top surface maximum distance be V2, between the spherical crown boss and cylinder piston top surface the smallest distance be V3, V1 and V2 it
Between ratio be 1.05-1.5, ratio between V2 and V3 is 1.3-2.5.
Projection width H of the water conservancy diversion step surface on cylinder piston top surface is 1mm-6mm.
The slope water conservancy diversion conical surface is connected by the first water conservancy diversion arcs with the inner periphery of water conservancy diversion step surface, the water conservancy diversion step
The excircle in face is connected by the second water conservancy diversion arcs with lower vortex groove.
The inside cambered surface of first water conservancy diversion arcs is tangent with the slope water conservancy diversion conical surface, the outside cambered surface of first water conservancy diversion arcs
Tangent with water conservancy diversion step surface, the radius R2 of circumference where the section of first water conservancy diversion arcs is 1mm-6mm；
The inside cambered surface of second water conservancy diversion arcs is tangent with water conservancy diversion step surface, the outside cambered surface of second water conservancy diversion arcs with
The inside cambered surface of lower vortex groove is tangent, and the radius R1 of circumference where the section of second water conservancy diversion arcs is 1mm-6mm.
Compared with prior art, the utility model has the following beneficial effects:
1, water conservancy diversion step surface is entering and leaving oily beam in a kind of low-loss diesel combustion cell structure of the utility model
It is formed when water conservancy diversion step surface and is shunted twice, the non-fuel vapor of a part is mixed with air during extending to combustion chamber central space
It closes, is conducive to flame and is extended to the middle part of combustion chamber, to make the high-temperature area of piston base to mobile, reduction in the middle part of combustion chamber
The heat loss of piston wall surface is conducive to improve the thermal efficiency；Another part air-flow then passes through slope and central boss and air
Further mixing promotes burning, while reducing the accumulation of fuel oil in lower vortex groove, in the heat transfer loss for reducing pit wall surface
While reduce soot generation.Therefore, the structure of water conservancy diversion step surface facilitates fuel oil and flame to combustion chamber in the design
Middle part extension, not only promotes fuel oil full combustion, but also can reduce thermic load and the heat transfer loss of combustion chamber.
2, the structure of upper vortex groove makes oily beam hit shape after wall in a kind of low-loss diesel combustion cell structure of the utility model
At the upper vortex moved to cylinder cap lower end surface, efficiency of combustion is further increased.Therefore, the design is two-fold flow structure, Neng Goujin
One step improves fuel utilization ratio.
3, pass through control combustion-chamber depth, water conservancy diversion step in a kind of low-loss diesel combustion cell structure of the utility model
Relationship between face height and spherical crown boss height three to be formed in combustion chamber along lower whirlpool to change the direction of motion of mist of oil
The lower vortex of chute, water conservancy diversion step surface, the slope water conservancy diversion conical surface and spherical crown boss facilitates in conjunction with the upper vortex of top of combustion chamber
Promote the mixing between fresh air and fuel oil, obtain gaseous mixture more evenly and faster burning velocity, to obtain more preferable
Fuel consumption and emission.Therefore, the design can promote air-fuel mixture uniform, effectively improve efficiency of combustion and air utilizes
Rate.
4, in a kind of low-loss diesel combustion cell structure of the utility model by adjusting the angle of water conservancy diversion step surface and
The size of first water conservancy diversion arcs and the second water conservancy diversion arc radius shunts after-burning oil stream to the momentum in the middle part of combustion chamber, Jin Eryou to control
Conducive to flame kernel far from combustion recess wall surface, reduce the heat transfer loss of wall surface.Therefore, the design is reasonable in design, has
Effect reduces the heat transfer loss of wall surface.
Detailed description of the invention
Fig. 1 is the structural schematic diagram of the utility model.
Fig. 2 is that the indoor oil gas of the utility model burning moves towards schematic diagram.
Fig. 3 is the embodiments of the present invention 1.
Fig. 4 is the embodiments of the present invention 2.
In figure: cylinder piston 1, the slope water conservancy diversion conical surface 2, spherical crown boss 21, the first water conservancy diversion arcs 22, water conservancy diversion step surface 3, second
Water conservancy diversion arcs 31, lower vortex groove 4, water conservancy diversion straight wall 41, third water conservancy diversion arcs 42, upper vortex groove 5.
Specific embodiment
The utility model is described in further detail below in conjunction with Detailed description of the invention and specific embodiment.
Referring to Fig. 1 to Fig. 4, a kind of low-loss burning chamber of diesel engine, including cylinder piston 1, the top of the cylinder piston 1
It is coaxially provided with the slope water conservancy diversion conical surface 2 and lower vortex groove 4；
Be provided with water conservancy diversion step surface 3 between the lower vortex groove 4 and the slope water conservancy diversion conical surface 2, the water conservancy diversion step surface 3 with tiltedly
Angle α between the slope water conservancy diversion conical surface 2 is 120 degree of -165 degree.
Angle between 1 top surface of the water conservancy diversion step surface 3 and cylinder piston is 0 degree of -30 degree.
The top of the slope water conservancy diversion conical surface 2 is provided with spherical crown boss 21, the slope water conservancy diversion conical surface 2 and spherical crown boss 21
Bottom cambered surface it is tangent, the spherical radius where the spherical crown boss 21 is 6mm-20mm.
Vortex groove 5 is offered at the top of the cylinder piston 1, the upper vortex groove 5 is coaxially disposed with lower vortex groove 4.
The upper vortex groove 5 passes sequentially through third water conservancy diversion arcs 42, water conservancy diversion straight wall 41 is connected with lower vortex groove 4, described to lead
Flowing straight wall 41 is the circumferential wall perpendicular to 1 top surface of cylinder piston, the lateral arcs of the lower end of the water conservancy diversion straight wall 41 and lower vortex groove 4
Face is tangent, and the upper end of the water conservancy diversion straight wall 41 and the inside cambered surface of third water conservancy diversion arcs 42 are tangent, outside the third water conservancy diversion arcs 42
Side cambered surface and upper 5 bottom cambered surface of vortex groove are tangent.
Maximum distance is V1, the water conservancy diversion step surface 3 and cylinder between 1 top surface of the lower vortex groove 4 and cylinder piston
Maximum distance is V2 between 1 top surface of piston, and the smallest distance is V3 between 1 top surface of the spherical crown boss 21 and cylinder piston,
Ratio between V1 and V2 is 1.05-1.5, and the ratio between V2 and V3 is 1.3-2.5.
Projection width H of the water conservancy diversion step surface 3 on 1 top surface of cylinder piston is 1mm-6mm.
The slope water conservancy diversion conical surface 2 is connected by the first water conservancy diversion arcs 22 with the inner periphery of water conservancy diversion step surface 3, the water conservancy diversion
The excircle of step surface 3 is connected by the second water conservancy diversion arcs 31 with lower vortex groove 4.
The inside cambered surface of first water conservancy diversion arcs 22 is tangent with the slope water conservancy diversion conical surface 2, outside first water conservancy diversion arcs 22
Side cambered surface and water conservancy diversion step surface 3 are tangent, and the radius R2 of circumference where the section of first water conservancy diversion arcs 22 is 1mm-6mm；
The inside cambered surface of second water conservancy diversion arcs 31 is tangent with water conservancy diversion step surface 3, the outside of second water conservancy diversion arcs 31
Cambered surface and the inside cambered surface of lower vortex groove 4 are tangent, and the radius R1 of circumference where the section of second water conservancy diversion arcs 31 is 1mm-
6mm。
The principles of the present invention are described as follows:
The core of the design is the combustion chamber progress structure optimization for cylinder of diesel engine piston, by adjusting lower vortex
Trend makes the Center Extender of fuel oil and flame to combustion chamber, the heat loss of piston wall surface is reduced, to effectively improve thermal effect
Rate reduces oil consumption and discharge.
Referring to fig. 2, fuel oil is sprayed from nozzle with mist, and mist of oil oil beam sprays to third water conservancy diversion arcs 42 and water conservancy diversion straight wall 41
Upper end after shunted for the first time, a part flow up into vortex groove 5 formed on be vortexed, another part flow downward through
It crosses water conservancy diversion straight wall 41 and enters vortex under lower vortex groove 4 is formed；Mist of oil proceeds through the second water conservancy diversion arcs 31 and is shunted for the second time,
The top that part forms vortex groove 4 under step reflux flows to further mixes with air, and not only promotes air-fuel mixture, improves
Efficiency of combustion；And make this part fuel-air mixture leave piston wall and extended towards combustion chamber central space, make fuel oil and flame
It is extended to the middle part of combustion chamber, to make the high-temperature area of piston base to movement in the middle part of combustion chamber, reduces piston wall surface
Heat transfer loss is conducive to improve the thermal efficiency；Remaining part flows to the first water conservancy diversion arcs 22 by third time point by water conservancy diversion step surface 3
Stream, a part further mix with air along the slope water conservancy diversion conical surface 2 and spherical crown boss 21 upwards, promote air-fuel mixture, another portion
Divide and mixed by 22 water conservancy diversion of the first water conservancy diversion arcs with the air in the middle part of combustion chamber, is conducive to fuel oil and flame and expands to the center of combustion chamber
Exhibition, that is, further decrease the heat loss at piston wall surface.
The design makes more unburned fuel oils to extension in the middle part of the more sufficient combustion chamber of air, strengthens fuel oil and air
Between mixing, facilitate reduce discharge and oil consumption.Since this combustion chamber makes more fuel oils and flame into combustion chamber
Heart extension, this position that will allow for being rebuffed by adjusting fuel oil make more fuel oils enter combustion chamber regular zone, vortex in reduction
Fuel oil.Therefore, the design can be effectively prevented fuel oil and be directly injected on cylinder sleeve, reduce the thermic load and burn oil of cylinder sleeve
Risk.
Simulation result shows that under full load mode, piston wall surface heat transfer loss is substantially reduced, the total heat transfer loss in combustion chamber
About 5% can be reduced, discharged nitrous oxides reduce about 10%.Under partial load condition, combustion chamber indicated thermal efficiency maximum be can be improved
1%, indicated specific fuel consumption maximum can improve 3g/kw.h.
Embodiment 1:
The top of a kind of low-loss burning chamber of diesel engine, including cylinder piston 1, the cylinder piston 1 is coaxially provided with slope
The water conservancy diversion conical surface 2 and lower vortex groove 4；Water conservancy diversion step surface 3 is provided between the lower vortex groove 4 and the slope water conservancy diversion conical surface 2, it is described to lead
Flowing the angle α between step surface 3 and the slope water conservancy diversion conical surface 2 is 120 degree of -165 degree；The lower vortex groove 4 and 1 top surface of cylinder piston
Between maximum distance be V1, maximum distance is V2, the spherical crown between 1 top surface of the water conservancy diversion step surface 3 and cylinder piston
The smallest distance is V3 between 1 top surface of boss 21 and cylinder piston, and the ratio between V1 and V2 is 1.05-1.5, between V2 and V3
Ratio be 1.3-2.5；Projection width H of the water conservancy diversion step surface 3 on 1 top surface of cylinder piston is 1mm-6mm；The slope
The water conservancy diversion conical surface 2 is connected by the first water conservancy diversion arcs 22 with the inner periphery of water conservancy diversion step surface 3, the excircle of the water conservancy diversion step surface 3
It is connected by the second water conservancy diversion arcs 31 with lower vortex groove 4.
Embodiment 2:
Embodiment 2 is substantially the same manner as Example 1, the difference is that:
Angle between 1 top surface of the water conservancy diversion step surface 3 and cylinder piston is 0 degree of -30 degree；First water conservancy diversion arcs 22
Inside cambered surface and the slope water conservancy diversion conical surface 2 it is tangent, the outside cambered surface and water conservancy diversion step surface 3 of first water conservancy diversion arcs 22 are tangent,
The radius R2 of circumference where the section of first water conservancy diversion arcs 22 is 1mm-6mm；The inside cambered surface of second water conservancy diversion arcs 31 with
Water conservancy diversion step surface 3 it is tangent, the outside cambered surface of second water conservancy diversion arcs 31 and the inside cambered surface of lower vortex groove 4 are tangent, described
The radius R1 of circumference where the section of two water conservancy diversion arcs 31 is 1mm-6mm.
Embodiment 3:
Embodiment 3 is substantially the same manner as Example 2, the difference is that:
The water conservancy diversion step surface 3 is parallel with the top surface of cylinder piston 1.
Embodiment 4:
Embodiment 4 is substantially the same manner as Example 2, the difference is that:
The top of the slope water conservancy diversion conical surface 2 is provided with spherical crown boss 21, the slope water conservancy diversion conical surface 2 and spherical crown boss 21
Bottom cambered surface it is tangent, the spherical radius where the spherical crown boss 21 is 6mm-20mm.
Embodiment 5:
Embodiment 5 is substantially the same manner as Example 4, the difference is that:
Vortex groove 5 is offered at the top of the cylinder piston 1, the upper vortex groove 5 is coaxially disposed with lower vortex groove 4；Institute
State that vortex groove 5 passes sequentially through third water conservancy diversion arcs 42, water conservancy diversion straight wall 41 is connected with lower vortex groove 4, the water conservancy diversion straight wall 41 is
Perpendicular to the circumferential wall of 1 top surface of cylinder piston, the lower end of the water conservancy diversion straight wall 41 and the outside cambered surface of lower vortex groove 4 are tangent, institute
The upper end for stating water conservancy diversion straight wall 41 and the inside cambered surface of third water conservancy diversion arcs 42 are tangent, the outside cambered surface of the third water conservancy diversion arcs 42 with it is upper
5 bottom cambered surface of vortex groove is tangent.
Claims (10)
1. a kind of low-loss burning chamber of diesel engine, including cylinder piston (1), it is coaxially provided at the top of the cylinder piston (1) tiltedly
The slope water conservancy diversion conical surface (2) and lower vortex groove (4), it is characterised in that:
It is provided with water conservancy diversion step surface (3) between the lower vortex groove (4) and the slope water conservancy diversion conical surface (2), the water conservancy diversion step surface (3)
Angle α between the slope water conservancy diversion conical surface (2) is 120 degree of -165 degree.
2. a kind of low-loss burning chamber of diesel engine according to claim 1, it is characterised in that:
Angle between the water conservancy diversion step surface (3) and cylinder piston (1) top surface is 0 degree of -30 degree.
3. a kind of low-loss burning chamber of diesel engine according to claim 2, it is characterised in that:
It is provided with spherical crown boss (21) at the top of the slope water conservancy diversion conical surface (2), the slope water conservancy diversion conical surface (2) and spherical crown boss
(21) bottom cambered surface is tangent, and the spherical radius where the spherical crown boss (21) is 6mm-20mm.
4. a kind of low-loss burning chamber of diesel engine according to claim 3, it is characterised in that:
Offered vortex groove (5) at the top of the cylinder piston (1), the upper vortex groove (5) with lower vortex groove (4) is coaxial sets
It sets.
5. a kind of low-loss burning chamber of diesel engine according to claim 4, it is characterised in that:
The upper vortex groove (5) passes sequentially through third water conservancy diversion arcs (42), water conservancy diversion straight wall (41) is connected with lower vortex groove (4), institute
Stating water conservancy diversion straight wall (41) is the circumferential wall perpendicular to cylinder piston (1) top surface, the lower end of the water conservancy diversion straight wall (41) and lower vortex
The outside cambered surface of slot (4) is tangent, and the upper end of the water conservancy diversion straight wall (41) and the inside cambered surface of third water conservancy diversion arcs (42) are tangent, described
The outside cambered surface of third water conservancy diversion arcs (42) and upper vortex groove (5) bottom cambered surface are tangent.
6. a kind of low-loss burning chamber of diesel engine described in any one of -5 according to claim 1, it is characterised in that:
Maximum distance is V1, the water conservancy diversion step surface (3) and gas between the lower vortex groove (4) and cylinder piston (1) top surface
Maximum distance is V2 between the cylinder piston (1) top surface, is provided with spherical crown boss (21) at the top of the slope water conservancy diversion conical surface (2),
The smallest distance is V3 between the spherical crown boss (21) and cylinder piston (1) top surface, and the ratio between V1 and V2 is 1.05-
Ratio between 1.5, V2 and V3 is 1.3-2.5.
7. a kind of low-loss burning chamber of diesel engine according to claim 6, it is characterised in that:
Projection width H of the water conservancy diversion step surface (3) on cylinder piston (1) top surface is 1mm-6mm.
8. a kind of low-loss burning chamber of diesel engine according to claim 7, it is characterised in that:
The slope water conservancy diversion conical surface (2) is connected by the first water conservancy diversion arcs (22) with the inner periphery of water conservancy diversion step surface (3), described to lead
The excircle of stream step surface (3) is connected by the second water conservancy diversion arcs (31) with lower vortex groove (4).
9. a kind of low-loss burning chamber of diesel engine according to claim 8, it is characterised in that:
The inside cambered surface of first water conservancy diversion arcs (22) is tangent with the slope water conservancy diversion conical surface (2), first water conservancy diversion arcs (22)
Outside cambered surface and water conservancy diversion step surface (3) are tangent, and the radius R2 of circumference where the section of first water conservancy diversion arcs (22) is 1mm-
6mm。
10. a kind of low-loss burning chamber of diesel engine according to claim 8, it is characterised in that:
The inside cambered surface of second water conservancy diversion arcs (31) is tangent with water conservancy diversion step surface (3), outside second water conservancy diversion arcs (31)
Side cambered surface and the inside cambered surface of lower vortex groove (4) are tangent, and the radius R1 of circumference is where the section of second water conservancy diversion arcs (31)
1mm-6mm。
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112065601A (en) * | 2020-09-11 | 2020-12-11 | 潍柴动力股份有限公司 | Piston and engine |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112065601A (en) * | 2020-09-11 | 2020-12-11 | 潍柴动力股份有限公司 | Piston and engine |
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