CN213510912U - Piston and diesel engine with same - Google Patents
Piston and diesel engine with same Download PDFInfo
- Publication number
- CN213510912U CN213510912U CN202021938483.7U CN202021938483U CN213510912U CN 213510912 U CN213510912 U CN 213510912U CN 202021938483 U CN202021938483 U CN 202021938483U CN 213510912 U CN213510912 U CN 213510912U
- Authority
- CN
- China
- Prior art keywords
- piston
- cylinder
- circular pit
- circular
- boss
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
Images
Landscapes
- Pistons, Piston Rings, And Cylinders (AREA)
- Combustion Methods Of Internal-Combustion Engines (AREA)
Abstract
The utility model belongs to the technical field of diesel engine, the utility model provides a piston assembles in the cylinder of engine, and the piston includes the piston body, locates the circular pit at the top of piston body and locates the middle boss in the circular pit, and the inside of middle boss is equipped with the storage chamber, and the storage chamber is through at least one passageway and circular pit intercommunication. In the compression process of the engine, air in a cylinder enters and is stored in the storage cavity through at least one channel between the circular pit and the storage cavity, when the piston moves to be close to the top dead center of the piston, the oil injection process starts, the air in the storage cavity can enter the circular pit through the two channels due to pressure difference in the middle oil injection period, namely after the piston moves to the compression top dead center, and the air jet flow with relatively low temperature not only can increase the air flow movement in the cylinder, promote the oil-gas mixing and improve the combustion; and the combustion temperature in the cylinder can be reduced, and the high-temperature NOx emission can be reduced.
Description
Technical Field
The utility model belongs to the technical field of diesel engine, concretely relates to piston. The utility model discloses still relate to a diesel engine.
Background
This section provides background information related to the present disclosure only and is not necessarily prior art.
The existing diesel engine combustion chamber, especially the direct injection diesel engine combustion chamber, mainly relies on the cylinder air flow movement and high pressure injection formed in the air intake process to promote the oil-gas mixing, the air intake duct can sacrifice part of the air duct circulation performance in order to generate the eddy flow movement with enough strength, so that the in-cylinder air intake efficiency is reduced, and the engine power is not promoted; high pressure injection systems rely on higher injection pressures to promote vaporization and mixing of diesel fuel, but as injection pressures increase, NOx emissions increase.
And the air flow motion of the inlet air and high-pressure injection are simply relied on to be difficult to form mixed gas with ideal uniformity, and a formed part of over-rich mixed gas area is easy to form an area with high combustion temperature and large heat transfer loss, so that the heat load of the piston is increased, the combustion deterioration is caused, and the reduction of the combustion efficiency and the generation of pollutants are further caused.
SUMMERY OF THE UTILITY MODEL
The utility model aims at solving the problem that the piston of diesel engine easily generates the pollutant and combustion performance is poor among the prior art at least, this purpose is realized through following technical scheme:
the utility model discloses a first aspect provides a piston, assembles in the cylinder of engine, the piston includes:
a piston body;
the circular concave pit is arranged at the top of the piston body;
the middle boss is arranged in the circular pit, a storage cavity and at least one channel are arranged in the middle boss, and the storage cavity is communicated with the circular pit through the at least one channel.
The utility model provides a piston newly designs air jet storage area in former machine combustion chamber pit, in the compression process of engine, the cylinder air gets into and stores in the storage chamber through at least one passageway between circular pit and the storage chamber, near piston motion to the piston top dead center, the oil spout process begins, in the middle of the oil spout promptly the piston move to the compression top dead center after, the air in the storage chamber can kick into circular pit through two passageways because the pressure difference, the air jet that the temperature is lower relatively not only can increase the cylinder air current motion, promote oil-gas mixture, improve the burning; and the combustion temperature in the cylinder can be reduced, and the high-temperature NOx emission can be reduced.
When the jet structure composed of the storage cavity and the channel is matched with the combustion chambers of diesel engines in different shapes, the volume of the jet cavity, namely the diameter of the storage cavity, the diameter d3 of the second end of the channel, the distance between the storage cavity and the top surface of the piston, the channel angle and the like, is mainly adjusted according to the specific structure of the matched combustion chamber, so that the storage cavity and the combustion chambers can achieve the best matching effect.
In addition, according to the utility model discloses a piston still can have following additional technical characterstic:
in some embodiments of the present invention, the circular recess is an ω -shaped rotation cavity using the axis of the piston as a central line, the piston further includes an annular groove disposed along the circumferential direction of the circular recess, one end of the annular groove is in arc transition connection with the wall surface of the circular recess, and the other end of the annular groove is connected with the top surface of the piston.
In some embodiments of the present invention, the channel is a straight channel.
In some embodiments of the present invention, the middle boss is a truncated cone frustum disposed at the center of the bottom surface of the circular recess.
In some embodiments of the present invention, the included angle between two generatrices of the same vertical section of the truncated cone frustum is an obtuse angle.
In some embodiments of the invention, the storage chamber is a ball cavity.
In some embodiments of the present invention, a vertical centerline through the center of the ball cavity coincides with an axial centerline of the combustion chamber.
In some embodiments of the present invention, the first end of the channel communicates with the storage chamber, the second end of the channel communicates with the circular recess, and a vertical distance between the first end and the top of the piston is greater than a vertical distance between the second end and the top of the piston.
In some embodiments of the present invention, at least two of the channels are disposed along the circumferential direction of the middle boss, and the at least two channels are distributed in a central symmetry manner.
A second aspect of the present invention provides a diesel engine, comprising:
the cylinder body is provided with a plurality of cylinders;
a plurality of pistons, the piston does the utility model discloses the piston that the first aspect provided, a plurality of pistons assemble with the mode of one-to-one the cylinder body in a plurality of cylinders.
The utility model discloses the diesel engine that the second aspect provided have with the utility model discloses the same beneficial effect of piston that the first aspect provided, no longer give unnecessary details here.
Drawings
Various other advantages and benefits will become apparent to those of ordinary skill in the art upon reading the following detailed description of the preferred embodiments. The drawings are only for purposes of illustrating the preferred embodiments and are not to be construed as limiting the invention. Also, like parts are designated by like reference numerals throughout the drawings. In the drawings:
fig. 1 schematically shows a cross-sectional structural view of a piston according to an embodiment of the present invention;
the reference symbols in the drawings denote the following:
10: piston body, 11: circular pit, 12: center boss, 13: storage chamber, 14: passage, 15: an annular groove.
Detailed Description
Exemplary embodiments of the present disclosure will be described in more detail below with reference to the accompanying drawings. While exemplary embodiments of the present disclosure are shown in the drawings, it should be understood that the present disclosure may be embodied in various forms and should not be limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the disclosure to those skilled in the art.
It is to be understood that the terminology used herein is for the purpose of describing particular example embodiments only, and is not intended to be limiting. As used herein, the singular forms "a", "an" and "the" may be intended to include the plural forms as well, unless the context clearly indicates otherwise. The terms "comprises," "comprising," "including," and "having" are inclusive and therefore specify the presence of stated features, steps, operations, elements, and/or components, but do not preclude the presence or addition of one or more other features, steps, operations, elements, components, and/or groups thereof. The method steps, processes, and operations described herein are not to be construed as necessarily requiring their performance in the particular order described or illustrated, unless specifically identified as an order of performance. It should also be understood that additional or alternative steps may be used.
Although the terms, second, third, etc. may be used herein to describe various elements, components, regions, layers and/or sections, these elements, components, regions, layers and/or sections should not be limited by these terms. These terms may be only used to distinguish one element, component, region, layer or section from another region, layer or section. Terms such as "second" and other numerical terms when used herein do not imply a sequence or order unless clearly indicated by the context. Thus, an element, component, region, layer or section discussed below could be termed a second element, component, region, layer or section without departing from the teachings of the example embodiments.
For convenience of description, spatially relative terms, such as "inner", "outer", "inner", "side", "lower", "below", "upper", "above", and the like, may be used herein to describe one element or feature's relationship to another element or feature as illustrated in the figures. Such spatially relative terms are intended to encompass different orientations of the device in use or operation in addition to the orientation depicted in the figures. For example, if the device in the figures is turned over, elements described as "below" or "beneath" other elements or features would then be oriented "above" or "over" the other elements or features. Thus, the example term "below … …" can include both an orientation of above and below. The device may be otherwise oriented (rotated 90 degrees or at other orientations) and the spatially relative descriptors used herein interpreted accordingly.
As shown in fig. 1, a first aspect of the present invention provides a piston, which is assembled in a cylinder of an engine, the piston including:
a piston body 10;
a circular pit 11 provided at the top of the piston body 10, the circular pit 11 forming a combustion chamber in the piston body 10;
the middle boss is arranged in the circular pit 11, a storage cavity 13 and at least one channel are arranged inside the middle boss, and the storage cavity 13 is communicated with the circular pit 11 through at least one channel 14.
The utility model provides a piston newly designs air jet storage area in former machine combustion chamber pit, in the compression process of engine, the cylinder air gets into and stores in storage chamber 13 through at least one passageway 14 between circular pit 11 and the storage chamber 13, near piston motion to the top dead center, the oil spout process begins, after piston motion to compression top dead center in the middle of the oil spout, the air in storage chamber 13 can penetrate into circular pit 11 through two passageways 14 because of the pressure difference, the air jet that the temperature is lower relatively not only can increase the cylinder in the air current motion, promote the oil-gas mixture, improve the burning; and the combustion temperature in the cylinder can be reduced, and the high-temperature NOx emission can be reduced.
When matching different shapes of diesel engine combustion chambers, the volume of the jet cavity, i.e. the diameter r of the storage cavity 13, the diameter d1 of the passage 14, the distance L1 between the storage cavity 13 and the top surface of the piston, the angle of the passage 14 and the like, is mainly adjusted according to the specific structure of the matched combustion chamber, so that the storage cavity 13 and the combustion chamber can achieve the best matching effect.
In some embodiments of the utility model, circular pit 11 is the omega shape rotating cavity that uses the axis of piston as the central line, and the piston still includes ring channel 15 along the circumference direction setting of circular pit 11, and the one end of ring channel 15 communicates with circular pit 11's wall with the circular arc transition, and the other end of ring channel 15 is connected with the top surface of piston. The annular groove 15 is arranged to form a step structure, so that fuel oil can be combusted in the combustion chamber in a layered mode, and the combustion effect is improved. The omega-shaped rotating cavity can improve the tumble effect and strengthen the combustion effect of the combustion chamber.
In some embodiments of the present invention, the channel 14 is a straight channel 14, and the straight channel 14 has a small injection resistance.
The utility model discloses an in some embodiments, the frustum round platform of middle boss for locating the bottom surface center of circular pit 11 forms the arcwall face in the circular pit 11 through setting up central boss 12, makes the air current generate the tumble in the combustion chamber, improves the combustion effect.
In some embodiments of the present invention, the included angle between two generatrices α of the same vertical cross section of the truncated cone frustum is an obtuse angle, so as to improve the tumble effect in the combustion chamber.
The utility model discloses an in some embodiments, storage chamber 13 is the ball die cavity, and storage effect is good, is convenient for adjustment size and combustion chamber cooperation.
In some embodiments of the utility model, the vertical center line through the centre of sphere of ball die cavity coincides with the axial direction line of combustion chamber, sets up the spherical cavity at the center, improves the homogeneity that sprays the air current.
The utility model discloses an in some embodiments, the first end and the storage chamber 13 intercommunication of passageway 14, the second end and the circular pit 11 intercommunication of passageway 14, vertical distance h1 between the top of first end and piston is greater than vertical distance h2 between the top of second end and piston, make the air in the storage chamber 13 penetrate circular pit 11 through passageway 14 through setting up passageway 14 under the effect of pressure differential, the air jet that the temperature is lower relatively not only can increase the interior air current motion of jar, promote the air-oil mixture, improve the burning.
In some embodiments of the present invention, at least two channels 14 are disposed along the circumferential direction of the central boss 12, the at least two channels 14 are distributed in a central symmetry manner, and a plurality of channels 14 are disposed to enhance the spraying uniformity.
In some embodiments of the present invention, at least two channels 14 are disposed along the circumferential direction of the middle boss 12, the at least two channels 14 are distributed in a central symmetry manner, and the uniformity of the injected air is improved by disposing two channels 14 in the central symmetry manner.
The second aspect of the utility model provides a diesel engine, diesel engine includes:
the cylinder body is provided with a plurality of cylinders;
a plurality of pistons, the piston does the utility model discloses the piston that the first aspect provided, a plurality of pistons assemble in a plurality of cylinders of cylinder body with the mode of one-to-one.
The utility model discloses the diesel engine that the second aspect provided have with the utility model discloses the same beneficial effect of piston that the first aspect provided, no longer give unnecessary details here.
The above description is only for the preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any changes or substitutions that can be easily conceived by those skilled in the art within the technical scope of the present invention should be covered by the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.
Claims (10)
1. A piston for assembly in a cylinder of an engine, the piston comprising:
a piston body;
the circular pit is arranged at the top of the piston body and forms a combustion chamber in the piston body;
the middle boss is arranged in the circular pit, a storage cavity and at least one channel are arranged in the middle boss, and the storage cavity is communicated with the circular pit through the at least one channel.
2. The piston as set forth in claim 1, wherein said circular recess is an ω -shaped rotary chamber centered on an axis of said piston, said piston further comprising an annular groove provided along a circumferential direction of said circular recess, one end of said annular groove being transitionally connected to a wall surface of said circular recess in an arc, and the other end of said annular groove being connected to a top surface of said piston.
3. The piston of claim 1 wherein said passage is a straight passage.
4. The piston of claim 1 wherein said intermediate boss is a frustoconical boss centrally disposed in the bottom surface of said circular recess.
5. The piston of claim 4 wherein the angle between two generatrices in the same vertical section of said frustoconical taper is obtuse.
6. The piston of claim 1 wherein said reservoir is a ball cavity.
7. The piston of claim 6 wherein a vertical centerline through the spherical center of said ball cavity coincides with an axial centerline of said combustion chamber.
8. The piston of any one of claims 1 to 7 wherein a first end of said passageway is in communication with said storage chamber and a second end of said passageway is in communication with said circular depression, the vertical distance between said first end and the top of said piston being greater than the vertical distance between said second end and the top of said piston.
9. The piston according to any one of claims 1 to 7, wherein at least two of said passages are provided in a circumferential direction of said intermediate boss, said at least two passages being arranged in a central symmetry.
10. A diesel engine, characterized in that the diesel engine comprises:
the cylinder body is provided with a plurality of cylinders;
a plurality of pistons according to any one of claims 1 to 9 fitted in the plurality of cylinders of the cylinder block in a one-to-one correspondence.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202021938483.7U CN213510912U (en) | 2020-09-07 | 2020-09-07 | Piston and diesel engine with same |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202021938483.7U CN213510912U (en) | 2020-09-07 | 2020-09-07 | Piston and diesel engine with same |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN213510912U true CN213510912U (en) | 2021-06-22 |
Family
ID=76445909
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202021938483.7U Active CN213510912U (en) | 2020-09-07 | 2020-09-07 | Piston and diesel engine with same |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN213510912U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114607522A (en) * | 2022-03-18 | 2022-06-10 | 潍柴动力股份有限公司 | Combustion system and engine |
-
2020
- 2020-09-07 CN CN202021938483.7U patent/CN213510912U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114607522A (en) * | 2022-03-18 | 2022-06-10 | 潍柴动力股份有限公司 | Combustion system and engine |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN203584599U (en) | Piston for internal combustion engine | |
| US7597084B2 (en) | Internal combustion engine and operating method therefor | |
| FI127022B (en) | Two-stroke internal combustion engine and method of operating it | |
| US8291881B2 (en) | Piston for internal combustion engine | |
| US20150128899A1 (en) | Piston Having Combustion Bowl Shaped to Balance Combustion Efficiency and Emission Properties | |
| US9328693B2 (en) | Piston, engine and operating method for reduced production of particulate matter | |
| CN102213135B (en) | Engine having fuel injection induced combustion chamber mixing | |
| US20150020765A1 (en) | Combustion bowl of piston | |
| KR102495810B1 (en) | Piston for diesel engine and direct inejction diesel engine including the same | |
| US20140216397A1 (en) | Diesel engine | |
| CN114135390B (en) | Engine and vehicle with same | |
| CN106103972A (en) | Including the compression engine of the direct fuel injection with compression ignition for the device that cools down piston | |
| CN102400825A (en) | Cooling needle valve matching part for marine diesel engine | |
| CN213510912U (en) | Piston and diesel engine with same | |
| FI124187B (en) | Internal combustion piston arrangement | |
| GB2557267A (en) | Piston Bowl | |
| CN101684761B (en) | Internal combustion engine with high squish piston | |
| CN102979654A (en) | Cooling-type needle valve coupling with carbon deposition prevention effect | |
| CN112282960A (en) | Multi-oil injector injection system of two-stroke marine low-speed machine with central oil injector | |
| CN107060986A (en) | One kind is used for the piston-engined combined type combustion chamber of two stroke Heavy End Aviation Fuels | |
| CN215633370U (en) | Engine and vehicle with same | |
| CN204900135U (en) | Engine gaseous fuel direct injection injection nozzle | |
| CN105019999B (en) | Gasoline engine combustion system and gasoline engine fuel injection method | |
| CN115750071B (en) | Gasoline engine combustion system, engine and vehicle | |
| CN217270514U (en) | Piston, engine and vehicle |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant |