CN209781027U - Combustion chamber and valve arrangement structure of multi-valve engine - Google Patents
Combustion chamber and valve arrangement structure of multi-valve engine Download PDFInfo
- Publication number
- CN209781027U CN209781027U CN201920017750.8U CN201920017750U CN209781027U CN 209781027 U CN209781027 U CN 209781027U CN 201920017750 U CN201920017750 U CN 201920017750U CN 209781027 U CN209781027 U CN 209781027U
- Authority
- CN
- China
- Prior art keywords
- combustion chamber
- valve
- wedge
- mounting side
- exhaust
- 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
Classifications
-
- 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
- Y02T10/00—Road transport of goods or passengers
- Y02T10/10—Internal combustion engine [ICE] based vehicles
- Y02T10/12—Improving ICE efficiencies
Landscapes
- Combustion Methods Of Internal-Combustion Engines (AREA)
Abstract
The utility model discloses a many valve engine's combustion chamber, combustion chamber structure and air flue arrangement form, the top of combustion chamber is equipped with the (air) intake valve installation side wedge face that is used for installing the (air) intake valve, is used for installing the exhaust valve installation side wedge face of exhaust valve and is used for installing the spark plug's spark plug installation side wedge face, all adopts spherical face except (air) intake valve installation side wedge face, exhaust valve installation side wedge face and spark plug installation side wedge face. The utility model discloses a redesign combustion chamber structure goes on, combines the design of inlet throat, outlet throat and intake duct, gas outlet duct, has both simplified the structure and the preparation technology, the cost of combustion chamber, also makes it have characteristics such as high tumble ratio, high vortex intensity, the heat loss is little, abundant burning, can also effectively reduce the engine advance, carminative resistance loss to improve engine outer performance and fuel economy performance.
Description
Technical Field
The invention belongs to the field of engines, and particularly relates to a combustion chamber and a valve arrangement structure of a multi-valve engine.
Background
In order to increase the air input of the engine, improve the air charging efficiency and the power performance of the engine, the traditional engine generally adopts a single-cylinder multi-valve form. In order to arrange a plurality of intake valves and exhaust valves, the existing engine generally adopts a basin-shaped combustion chamber or a wedge-shaped combustion chamber with a particularly large surface-to-volume ratio (the ratio of the surface area of the combustion chamber to the volume), and a structural form with a very small included angle between the valve and the center line of the combustion chamber.
In the structure form, the overlarge surface-to-volume ratio is not beneficial to full mixing of oil and gas, the mixed gas is difficult to form the characteristics of promoting quick combustion such as layering, tumble, squeezing flow and vortex, and the characteristics of large heat loss and high HC and carbon smoke emission can be caused; and if the included angle between the valve and the central line of the combustion chamber is too small, the air flow can suddenly turn by nearly 90 degrees at the intersection position of the air passage and the throat, so that the resistance loss of the air inlet and the air outlet along the way is increased, and the inflation efficiency is reduced.
Based on this, the present application is proposed.
Disclosure of Invention
In order to solve the problems of poor combustion effect, excessive heat loss and the like caused by unreasonable structural design and valve arrangement form of a multi-valve combustion chamber in the prior art, the invention provides a multi-valve engine combustion chamber and a valve arrangement structure with a redesigned structure, which can fully mix oil and gas, improve the combustion efficiency and ensure the air intake and exhaust efficiency of a valve.
In order to achieve the purpose, the invention adopts the following scheme: the top of the combustion chamber is a semi-spherical or small semi-spherical surface which is mainly formed by combining three wedge surfaces of an inlet valve mounting side wedge surface, an exhaust valve mounting side wedge surface and a spark plug mounting side wedge surface and at least two spherical connecting surfaces. The combustion chamber is in the form of a roof ridge at or near the center of the top.
The intake valve mounting-side wedge surface is an inclined plane for mounting an intake valve (which can be understood as communicating with an intake passage). The exhaust valve mounting side wedge surface is an inclined plane surface for mounting the exhaust valve (which can be understood as communicating with the exhaust passage). The spark plug mounting side wedge surface is an inclined plane surface for mounting the spark plug. The definition is similar to the wedge surface of the mounting side of the intake valve.
In the present invention, when the piston is positioned at the top dead center, a space formed above the top surface of the piston and below the bottom surface of the cylinder head is referred to as a combustion chamber. The central line of the combustion chamber is the central line positioned in the center of the combustion chamber and on a vertical plane; the side near the center of the top of the combustion chamber is the inner side, and the opposite side is the outer side. Hemispherical refers to the dome shape of one-half of a sphere, and small hemispherical refers to the solid shape of an arch, i.e., less than one-half of a sphere. The spherical joint surface refers to a partial arc surface of a hemisphere and a small hemisphere, and is used for connecting the wedge surface with the edge of the combustion chamber.
The invention further provides the following: the three wedge-shaped surfaces are adjacent to each other in pairs, and the connecting parts are all positioned at the center of the top of the combustion chamber or near the center. The three wedge-shaped surfaces are adjacent to each other in pairs to form three connecting parts, the connecting parts are used as boundaries, and the wedge-shaped surfaces at two sides are intersected at an obtuse angle.
The invention further provides the following: the side of the wedge-shaped surface which is connected with each other is taken as the inner side edge, and the outer side edge of the wedge-shaped surface is superposed with the edge of the combustion chamber. The structure maximizes the area of the wedge-shaped surface and minimizes the area of the spherical connecting surface, so that the casting die is convenient to produce.
The invention further provides the following: the outer edge and the inner edge of the wedge-shaped surface are in intermediate edge transition connection, and the spherical connection surface is located between the intermediate edge and the edge of the combustion chamber, so that the tumble ratio can be improved, and the combustion efficiency is improved.
the invention is further provided with the following steps that in order to ensure the best installation effect and air intake and exhaust efficiency and enable the combustion to be sufficient, the included angle between the mounting side wedge ~ shaped surface of the air inlet valve and the horizontal plane is 5 ~ 25 degrees and/or the included angle between the mounting side wedge ~ shaped surface of the exhaust valve and the horizontal plane is 5 ~ 30 degrees.
The invention further provides the following: the joint of the air inlet wedge-shaped surface and the air outlet wedge-shaped surface deviates from the central line and leans against the side of the air outlet wedge-shaped surface. The structure can increase the included angle between the air passage and the throat and improve the air inlet efficiency, the oil-gas mixture entering the combustion chamber forms better layering, and reasonable-concentration oil-gas surrounding can be formed around the spark plug electrode, so that flame is rapidly spread, and the phenomenon of catching fire when the flame is rapidly combusted and avoided.
the invention also provides a valve arrangement structure of the multi ~ valve engine, which adopts the technical scheme that the multi ~ valve engine comprises the combustion chamber, at least two air inlet throat openings are installed and communicated on the air inlet wedge ~ shaped surface, at least one exhaust throat opening is installed and communicated on the exhaust wedge ~ shaped surface, the included angle between the air inlet throat opening and the central line of the combustion chamber is 5 ~ 25 degrees, and the included angle between the exhaust throat opening and the central line of the combustion chamber is 5 ~ 30 degrees.
The valve arrangement structure of the multi-valve engine described above is further provided as follows: the air inlet throat is perpendicular to the wedge-shaped surface of the mounting side of the air inlet valve, and the air outlet throat is perpendicular to the wedge-shaped surface of the mounting side of the air outlet valve. On one hand, the valve seat ring can be fully attached to the wedge-shaped surface, and the sealing performance of the valve is ensured; on the other hand, the design difficulty and the processing difficulty of the mould/sand core are reduced.
In order to facilitate air intake and exhaust, the valve arrangement structure of the multi-valve engine is further provided as follows: the air inlet throat and the air outlet throat are cylindrical openings.
The invention has the following technical effects: firstly, the invention ensures that the combustion chamber has reasonable surface-to-volume ratio while arranging a plurality of air inlet and exhaust valves by redesigning the structure of the combustion chamber, is beneficial to not only airflow organization and sufficient mixing of the oil-gas mixed gas, but also formation of the quickly combustible mixed gas with characteristics of layering, tumble, extrusion, vortex and the like, thereby ensuring sufficient combustion, improving the combustion efficiency and reducing the emission of HC compounds. In addition, the reasonable surface-to-volume ratio can also reduce heat loss generated by combustion, and further contributes to improving the heat efficiency and the fuel economy of the engine.
The ignition position of the spark plug is closer to the theoretical center, the flame propagation distance can be shortened, the flame sprayed by the spark plug is opposite to the oil-gas mixed gas, the flame propagation and the full combustion of the oil-gas mixed gas are facilitated, and the fuel economy is improved.
Through the reasonable design of the valve arrangement form, the invention can effectively reduce the on-way resistance loss of air inlet and air exhaust in the working process of the engine, improve the air inlet and air exhaust efficiency, improve the oil-gas mixing effect and the organization of air flow to ensure that the air flow is fully and quickly combusted, and avoid the problems of abnormal combustion phenomena such as overlarge pumping loss, local vortex, low charging efficiency, surface ignition, local combustion and the like caused by the excessively small included angle theta between the valve and the central line of a combustion chamber, thereby improving the external performance of the engine, and improving the fuel economy and the emission.
The invention greatly simplifies the structure of the combustion chamber, reduces the manufacturing difficulty of the sand core mould, and enables the air inlet and exhaust passages and the combustion chamber mould core box to be reused, thereby improving the utilization rate of the sand core and greatly reducing the manufacturing difficulty and cost of the mould.
Drawings
FIG. 1 is a general schematic diagram of an embodiment of the present invention.
Fig. 2 is a front view of an embodiment of the present invention.
Shown in the figure: the air-intake valve structure comprises a cylinder cover 1, an exhaust passage 2, an exhaust passage 3, an exhaust valve spring assembly 4, an exhaust valve 5, a combustion chamber 6, an intake valve 7, an intake valve spring assembly 8, an intake passage 9, an intake throat 10, an exhaust throat, a spherical surface I, b, an exhaust valve mounting side wedge-shaped surface, c, a spark plug mounting side wedge-shaped surface, d, a spherical surface II and e, wherein the intake valve mounting side wedge-shaped surface is arranged on the cylinder cover.
Detailed Description
In order to make the technical means, the creation characteristics, the achievement purposes and the effects of the invention easy to understand, the invention is further described with the specific embodiments.
Example 1
As shown in fig. 1, the present embodiment provides a combustion chamber 5 of a multi-valve engine, the top of the combustion chamber 5 is a small hemispherical spherical surface, the small hemispherical spherical surface is mainly formed by splicing an intake valve mounting side wedge surface e, an exhaust valve mounting side wedge surface b, a spark plug mounting side wedge surface c, a spherical surface ia, and a spherical surface iid, three wedge surfaces of the intake valve mounting side wedge surface e, the exhaust valve mounting side wedge surface b, and the spark plug mounting side wedge surface c are adjacent and connected to the center of the combustion chamber 5 (the present embodiment takes the side close to the center of the combustion chamber 5 as the inside, and the opposite side as the outside): the inlet valve mounting side wedge-shaped surface e and the exhaust valve mounting side wedge-shaped surface b are arranged oppositely, and the joint of the inlet valve mounting side wedge-shaped surface e and the exhaust valve mounting side wedge-shaped surface b deviates from the central line and is close to the side where the exhaust valve mounting side wedge-shaped surface b is located.
the air inlet valve mounting side wedge ~ shaped surface e and the exhaust valve mounting side wedge ~ shaped surface b are centered at the joint, the outer side of the air inlet valve mounting side wedge ~ shaped surface e and the outer side of the exhaust valve mounting side wedge ~ shaped surface b are turned inwards, an obtuse angle of 120 ~ 170 degrees is formed between the air inlet valve mounting side wedge ~ shaped surface e and the exhaust valve mounting side wedge ~ shaped surface b, the inner sides of two positions of the spark plug mounting side wedge ~ shaped surface c are respectively connected with the air valve mounting side wedge ~ shaped surface and the exhaust valve mounting side wedge ~ shaped surface b, and the outer side of the spark plug mounting side wedge ~ shaped surface c is turned inwards, so that obtuse angles of 120 ~ 170 degrees are respectively formed between the spark plug mounting side wedge ~ shaped.
The spherical surface Ia is positioned between the inlet valve mounting side wedge surface e and the exhaust valve mounting side wedge surface b and is used as a connecting surface of the inlet valve mounting side wedge surface e and the exhaust valve mounting side wedge surface b. The spherical surface IId is located between the intake valve mounting side wedge surface e and the spark plug mounting side wedge surface c as a connecting surface of both. In addition to the spherical surfaces ia and iid, a small spherical surface iii may be provided between the exhaust valve mounting side wedge surface b and the spark plug mounting side wedge surface c to ensure smooth transition of the spherical surface of the combustion chamber 5 between the wedge surfaces, in order to make the spherical surface structure of the combustion chamber 5 complete and smooth.
In this embodiment, for the face of improving combustion chamber 5 is easy, regard the outside edge of wedge face as combustion chamber 5 edge setting, both be convenient for manufacturing, still be favorable to improving oil gas efficiency of admitting air.
Example 2
The present embodiment is different from embodiment 1 in that: in the embodiment, at least one of the positions between the mounting side wedge surfaces e of the inlet valve, between the mounting side wedge surfaces e of the inlet valve and the mounting side wedge surfaces c of the spark plug and between the mounting side wedge surfaces c of the spark plug and the mounting side wedge surfaces b of the exhaust valve is indirectly connected by a spherical surface.
Example 3
The present embodiment is different from embodiments 1 and 2 in that: in the present embodiment, the edge of at least one of the intake valve mounting side wedge surface e, the spark plug mounting side wedge surface c, and the exhaust valve mounting side wedge surface b is indirectly connected with the edge of the combustion chamber 5 by using a spherical surface. That is, the outer edge of at least one of the three is not the outer edge of the combustion chamber 5.
Example 4
As shown in fig. 1, in the present embodiment, two inlet throat openings 9 arranged side by side are communicated with the inlet valve mounting side wedge surface e, and one exhaust throat opening 10 is communicated with the exhaust valve mounting side wedge surface b on the top surface of the combustion chamber 5. The two inlet throats 9 are connected together to an inlet duct, and the outlet throat 10 is connected to an outlet duct 2. The sizes of the inlet valve mounting side wedge-shaped surface e, the exhaust valve mounting side wedge-shaped surface b and the spark plug mounting side wedge-shaped surface c are respectively matched with the sizes of the two inlet valves 6, the two exhaust valves 4 and the spark plugs.
The inlet throat 9 and/or the exhaust throat 10 are/is preferably perpendicular to the inlet valve mounting side wedge surface e/the exhaust valve mounting side wedge surface b, and the inlet throat 9 and the exhaust throat 10 are/is preferably a cylindrical communicating port slightly higher than the inlet passage and the exhaust passage 2.
In this embodiment, the two air inlet throats 9 are preferably the same in size and structure, and the structure is convenient to process and design, and can ensure that the air inlet flow and the air inlet speed of the two air inlet throats 9 are similar, so that the air inlet is uniform, and the oil gas in the combustion chamber 5 can be fully combusted.
Example 5
This embodiment is different from embodiment 4 in that: two inlet throat openings 9 arranged side by side are communicated with the inlet valve mounting side wedge-shaped surface e, and two exhaust throat openings 10 are communicated with the exhaust valve mounting side wedge-shaped surface b. The two inlet throats 9 are connected together to an inlet duct, and the two outlet throats 10 are connected together to an outlet duct 2.
Example 6
This embodiment is different from embodiment 4 in that: in this embodiment, three intake throat openings 9 are communicated with the intake valve mounting side wedge surface e in a triangular distribution, and one exhaust throat opening 10 is communicated with the exhaust valve mounting side wedge surface b. The three air inlet throats 9 are connected to an air inlet channel together, and the exhaust throat 10 is communicated with an exhaust channel 2.
Example 7
on the basis of the combustion chamber 5 of the above embodiment, in the present embodiment, the intake valve 6 and the intake valve 6 spring assembly, and the exhaust valve 4 spring assembly 3 are respectively disposed in the intake throat 9 and the exhaust throat 10, an included angle between the intake valve 6 and a central line of the combustion chamber 5 is smaller than an included angle between the exhaust valve 4 and a central line of the combustion chamber 5, and an angle difference can be maintained at 2 ~ 5 °.
in the embodiment, the included angle between the intake valve 6 and the central line of the combustion chamber 5 is 5 ~ 25 degrees, and the included angle between the exhaust valve 4 and the central line of the combustion chamber 5 is 5 ~ 30 degrees.
preferably, the included angles between the intake valve 6 and the central line of the combustion chamber 5 are respectively 10 degrees, and the included angles between the exhaust valve 4 and the central line of the combustion chamber 5 are 12-15 degrees.
preferably, the included angles between the intake valve 6 and the central line of the combustion chamber 5 are respectively 15 degrees, and the included angles between the exhaust valve 4 and the central line of the combustion chamber 5 are respectively 17-20 degrees.
Based on the above, the invention provides a combustion chamber 5, a combustion chamber 5 structure and an air passage arrangement structure of a multi-valve engine, the structure of the combustion chamber 5 is redesigned by combining a wedge-shaped mounting surface and a spherical surface of an inlet valve 6, an exhaust valve 4 and a spark plug, the structure of the combustion chamber 5 and a manufacturing process thereof are greatly simplified, the manufacturing difficulty and the manufacturing cost of the structure of the combustion chamber 5 are also reduced, and the structure of the combustion chamber 5 has the characteristics of high tumble ratio, high vortex strength, small heat loss and the like; and the design of the air inlet throat 9 and the air outlet throat, the air inlet channel and the air outlet channel is combined, so that the resistance loss of air inlet and exhaust of the engine can be effectively reduced, the air inlet efficiency of the combustion chamber 5 is high and uniform, and the combustion chamber can be fully contacted with flame and fully combusted, thereby improving the external performance of the engine and the fuel economy.
It will be appreciated by those skilled in the art that the invention may be embodied in other specific forms without departing from the spirit or essential characteristics thereof. The embodiments disclosed above are therefore to be considered in all respects as illustrative and not restrictive. All changes which come within the scope of or equivalence to the invention are intended to be embraced therein.
Claims (9)
1. A combustion chamber of a multi-valve engine, characterized in that: the top of the combustion chamber is a hemispherical or small-hemispherical spherical surface which is formed by splicing three wedge surfaces of an inlet valve mounting side wedge surface, an exhaust valve mounting side wedge surface and a spark plug mounting side wedge surface and at least one spherical connecting surface; the combustion chamber is bulged at or near the center of the top.
2. The combustion chamber of a multi-valve engine according to claim 1, characterized in that: the three wedge-shaped surfaces are adjacent to each other in pairs, and the connecting parts are all positioned at the center of the top of the combustion chamber or near the center.
3. The combustion chamber of the multi-valve engine according to claim 1 or 2, characterized in that: the side of the wedge-shaped surface which is connected with each other is taken as the inner side edge, and the outer side edge of the wedge-shaped surface is superposed with the edge of the combustion chamber.
4. The combustion chamber of a multi-valve engine according to claim 1, characterized in that: the outer edge and the inner edge of the wedge-shaped surface are in transition connection with the middle edge, and the spherical connection surface is positioned between the middle edge and the edge of the combustion chamber.
5. the combustion chamber of a multi-valve engine according ~ claim 1, wherein an angle between the wedge-shaped surface of the intake valve mounting side and a horizontal plane is 5 ~ 25 ° and/or an angle between the wedge-shaped surface of the exhaust valve mounting side and a horizontal plane is 5 ~ 30 °.
6. The combustion chamber of a multi-valve engine according to claim 1, characterized in that: the joint of the mounting side wedge-shaped surface of the intake valve and the mounting side wedge-shaped surface of the exhaust valve deviates from the central line and is close to the side of the mounting side wedge-shaped surface of the exhaust valve.
7. A valve arrangement structure of a multi-valve engine, characterized in that: the combustion chamber of claim 1 to 5, wherein at least two inlet throats are arranged on the wedge-shaped surface of the inlet valve mounting side, and at least one exhaust throat is arranged on and communicated with the wedge-shaped surface of the exhaust valve mounting side; the included angle between the air inlet throat and the central line of the combustion chamber is smaller than the included angle between the exhaust throat and the central line of the combustion chamber.
8. The valve arrangement structure of a multi-valve engine according to claim 7, characterized in that: the air inlet throat is perpendicular to the wedge-shaped surface of the mounting side of the air inlet valve and/or the wedge-shaped surface of the mounting side of the exhaust valve of the exhaust throat.
9. The valve arrangement structure of a multi-valve engine according to claim 7, characterized in that: the air inlet throat and the air outlet throat are cylindrical communicating ports.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201920017750.8U CN209781027U (en) | 2019-01-07 | 2019-01-07 | Combustion chamber and valve arrangement structure of multi-valve engine |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201920017750.8U CN209781027U (en) | 2019-01-07 | 2019-01-07 | Combustion chamber and valve arrangement structure of multi-valve engine |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN209781027U true CN209781027U (en) | 2019-12-13 |
Family
ID=68792004
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201920017750.8U Active CN209781027U (en) | 2019-01-07 | 2019-01-07 | Combustion chamber and valve arrangement structure of multi-valve engine |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN209781027U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109707500A (en) * | 2019-01-07 | 2019-05-03 | 浙江康思特动力机械有限公司 | The combustion chamber of multivalve engine and valve arrangement structure |
-
2019
- 2019-01-07 CN CN201920017750.8U patent/CN209781027U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109707500A (en) * | 2019-01-07 | 2019-05-03 | 浙江康思特动力机械有限公司 | The combustion chamber of multivalve engine and valve arrangement structure |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| US7284524B2 (en) | Cylinder head assemblies | |
| CN105863868B (en) | Air inlet channel and combustion system of turbocharged gasoline engine | |
| CN204060916U (en) | For the intake duct of gaseous fuel explosive motor and the configuration of valve seat | |
| CN209781027U (en) | Combustion chamber and valve arrangement structure of multi-valve engine | |
| CN201794675U (en) | Squeeze-flow type compact combustion system with high compression ratio | |
| CN2864141Y (en) | Cylinder cover of motorcycle engine | |
| CN217107241U (en) | Engine cylinder cover, engine and automobile | |
| CN109707500A (en) | The combustion chamber of multivalve engine and valve arrangement structure | |
| CN110966113A (en) | Gasoline engine and piston top structure thereof | |
| CN202451292U (en) | Engine piston for Atkinson cycle | |
| CN104153907A (en) | Composite surface wedge-shaped combustion chamber gasoline engine cylinder end | |
| CN204827700U (en) | Engine piston | |
| CN200964903Y (en) | Engine cylinder head | |
| CN209781026U (en) | Combustion chamber, combustion chamber structure and air passage arrangement structure of three-valve engine | |
| CN106762101A (en) | A kind of directly jetting gasoline engine combustion system and control method | |
| JP3201790B2 (en) | Engine intake device and intake supply method | |
| CN201347809Y (en) | Engine cylinder end | |
| CN2903433Y (en) | Engine cylinder head | |
| CN201546831U (en) | Four-valve cylinder head sharing inlet passage and exhaust passage | |
| CN2903429Y (en) | Engine cylinder head | |
| CN2713148Y (en) | Low emission diesel piston combustion chamber | |
| CN218235276U (en) | Combustion chamber structure of engine cylinder head | |
| CN204755065U (en) | A engine for on motor vehicle | |
| CN203321693U (en) | Four-valve engine cylinder head provided with separated gas ducts | |
| CN106438090A (en) | Low-emission motorcycle engine |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant |