CN217481410U - Cylinder head and engine - Google Patents
Cylinder head and engine Download PDFInfo
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- CN217481410U CN217481410U CN202221109831.9U CN202221109831U CN217481410U CN 217481410 U CN217481410 U CN 217481410U CN 202221109831 U CN202221109831 U CN 202221109831U CN 217481410 U CN217481410 U CN 217481410U
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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
- Y02T10/00—Road transport of goods or passengers
- Y02T10/10—Internal combustion engine [ICE] based vehicles
- Y02T10/12—Improving ICE efficiencies
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Abstract
The utility model discloses a cylinder head and engine relates to engine technical field. The cylinder cover comprises a cooling water cavity, the cooling water cavity comprises an upper water cavity and a lower water cavity, the upper water cavity and the lower water cavity are communicated through a plug bush cooling cavity, and the plug bush cooling cavity is arranged in the circumferential direction of the oil injector and used for cooling the oil injector; the water feeding cavity and the lower water cavity are further provided with cooling water holes, the cooling water holes are obliquely arranged at a preset angle from one side close to the plug bush cooling cavity to the direction far away from the plug bush cooling cavity, and water flowing into the lower water cavity from the cooling water holes of the water feeding cavity can guide water flowing into the lower water cavity from the plug bush cooling cavity to flow along the bottom surface of the cylinder cover. The cylinder cover can lead water flow to take away more heat under the condition of not increasing the weight, reduce the temperature of the bottom surface of the cylinder cover and improve the endurance capacity of the cylinder cover.
Description
Technical Field
The utility model relates to the technical field of engines, especially, relate to a cylinder head and engine.
Background
With the improvement of awareness of society on environmental protection and energy utilization, people increasingly demand the thermal efficiency of engines. The improvement of the explosion pressure of the engine is an effective technical means, but the strength of the engine cylinder cover is also continuously improved along with the increasing of the explosion pressure of the engine.
The cylinder cover is a main part of the engine and is used for sealing the top of the cylinder and forming a combustion space with the piston and the cylinder to ensure the smooth proceeding of the exhaust process of the engine. When the cylinder cover works, the cylinder cover is not only subjected to the pretightening force of the fastening bolt, but also subjected to the explosion pressure of gas in the cylinder; under the action of high-temperature fuel gas, the fuel gas also bears the action of alternating thermal stress. As shown in figure 1, the traditional cylinder cover adopts a TOP-Down cooling mode, and water flow from the water feeding cavity 1 downwards washes the bottom surface of the cylinder cover through the insert cooling cavity 3, so that the effect of cooling the bottom surface of the cylinder cover is achieved. However, in the process that water flows to the lower water cavity 2 through the plug bush cooling cavity 3, because the flow area of the plug bush cooling cavity 3 is small and the space of the lower water cavity 2 is large, the flow rate of the water flow at the plug bush cooling cavity 3 is high, and the flow rate of the water flow in the lower water cavity 2 is low. Due to the sudden change of the flow velocity caused by the flow area and the rotation of the flow direction by 90 degrees, a vortex is generated at the inlet of the lower water cavity 2, and the vortex can guide the water to flow to the upper side, so that the bottom surface of the cylinder cover is insufficiently cooled.
SUMMERY OF THE UTILITY MODEL
The utility model aims at providing a cylinder cover and an engine, wherein the cylinder cover can be fully cooled, and the tolerance capability of the cylinder cover is improved; the engine using the cylinder cover has high thermal efficiency.
To achieve the purpose, the utility model adopts the following technical proposal:
a cylinder cover comprises a cooling water cavity, wherein the cooling water cavity comprises an upper water cavity and a lower water cavity, the upper water cavity is communicated with the lower water cavity through a plug bush cooling cavity, and the plug bush cooling cavity is arranged in the circumferential direction of a fuel injector and used for cooling the fuel injector; go up the water cavity with still be provided with the cooling water hole between the water cavity down, the cooling water hole is close to from one side of plug bush cooling cavity is with presetting the angle to keeping away from the direction slope setting of plug bush cooling cavity, go up the water cavity certainly the cooling water hole flows in the rivers in water cavity down can guide go up the water cavity certainly the plug bush cooling cavity flows in the rivers in water cavity down are followed the cylinder head bottom surface flows.
As an alternative of the cylinder head, if the preset angle is phi, phi is 55-75 degrees, where phi is an included angle between the axis of the cooling water hole and the bottom surface of the cylinder head.
As an optional scheme of the cylinder cover, the insert sleeve cooling cavity is plum blossom-shaped, and the cooling water holes are formed in one side, away from the oil sprayer, of plum blossom-shaped plum petals of the insert sleeve cooling cavity.
As an alternative of the cylinder cover, the cross-sectional area of the cooling water hole is S Hole(s) The cross section area of the plum petals is S Valve Then S is Hole(s) ＝S Valve /5～S Valve /3。
As an alternative of the cylinder cover, two intake valves and two exhaust valves are arranged on the cylinder cover, the two intake valves and the two exhaust valves are arranged around the circumference of the fuel injector, and a central connecting line of the two intake valves is parallel to a central connecting line of the two exhaust valves and forms a preset included angle with a main axis of the engine;
and the cooling water holes are formed between the two exhaust valves and between the intake valve and the exhaust valve.
As an alternative of the cylinder head, if the preset included angle is θ, θ is 0 to 70 °.
As an alternative to the cylinder head, the diameter of the cooling water hole between the two exhaust valves is larger than the diameter of the cooling water hole between the intake valve and the exhaust valve.
As an alternative of the cylinder cover, plum petals of the insert cooling cavity are arranged between the two exhaust valves and between the intake valve and the exhaust valve.
As an alternative of the cylinder head, a cross-sectional area of the cloverleaf between the two exhaust valves is larger than a cross-sectional area of the cloverleaf between the intake valve and the exhaust valve.
An engine comprising a cylinder and a cylinder head according to any preceding claim, the cylinder head being fixedly attached to the top of the cylinder.
The utility model has the advantages that:
the utility model provides a cylinder head through set up the cooling water hole between last water cavity and lower water cavity, can increase discharge to take away more heats. The cooling water hole is obliquely arranged from one side close to the plug bush cooling cavity at a preset angle to the direction far away from the plug bush cooling cavity, so that water flowing into the lower water cavity from the cooling water hole can damage a vortex area formed in the lower water cavity due to the small flow area of the plug bush cooling cavity, the flowing loss is reduced, the flowing smoothness is improved, water is guided to flow along the bottom surface of the lower water cavity, the cooling effect of the bottom surface of the cylinder cover is enhanced, and the working temperature of the cylinder cover is reduced. The cylinder cover can lead water flow to take away more heat under the condition of not increasing the weight, reduce the temperature of the cylinder cover and improve the tolerance of the cylinder cover.
The utility model provides an engine, including cylinder and foretell cylinder head, cylinder head fixed connection is in the top of cylinder, through set up the cooling water hole in the cylinder head between last water cavity and the time cavity, the cooling water hole can not only increase discharge, can destroy the vortex that the rivers that flow into time cavity through the plug bush cooling chamber formed in addition, and guide rivers flow along the bottom surface of time cavity for the cylinder head bottom surface fully cools off, improves the tolerance ability of cylinder head and the thermal efficiency of engine.
Drawings
FIG. 1 is a schematic view of a cooling water chamber of a cylinder head provided in the prior art;
fig. 2 is a schematic structural diagram of a cooling water cavity of a cylinder head according to an embodiment of the present invention;
fig. 3 is a schematic view of an arrangement structure of cooling water holes on a cylinder head according to an embodiment of the present invention.
In the figure:
100. an oil injector;
1. a water feeding cavity; 2. a drainage cavity; 3. a sleeve cooling cavity; 4. cooling water holes; 5. mounting holes; 6. an intake valve; 7. an exhaust valve;
31. first plum petal; 32. second plum blossom petal; 33. third plum blossom petal; 41. a first cooling water hole; 42. a second cooling water hole; 43. a third cooling water hole; 61. a first intake valve; 62. a second intake valve; 71. a first exhaust valve; 72. and a second exhaust valve.
Detailed Description
In order to make the technical problems, the technical solutions adopted and the technical effects achieved by the present invention clearer, the technical solutions of the present invention are further explained below by means of specific embodiments in conjunction with the accompanying drawings.
In the description of the present invention, unless otherwise explicitly specified or limited, the terms "connected", "connected" and "fixed" are to be construed broadly, e.g., as being fixedly connected, detachably connected, or integrated; can be mechanically or electrically connected; they may be directly connected or indirectly connected through intervening media, or may be connected through the use of two elements or the interaction of two elements. The specific meaning of the above terms in the present invention can be understood as a specific case by those skilled in the art.
In the present disclosure, unless expressly stated or limited otherwise, the first feature "on" or "under" the second feature may comprise direct contact between the first and second features, or may comprise contact between the first and second features not directly. Also, the first feature "on," "above" and "over" the second feature may include the first feature being directly above and obliquely above the second feature, or simply indicating that the first feature is at a higher level than the second feature. "beneath," "under" and "beneath" a first feature includes the first feature being directly beneath and obliquely beneath the second feature, or simply indicating that the first feature is at a lesser elevation than the second feature.
In the description of the present embodiment, the terms "upper", "lower", "right", and the like are used in the orientation or positional relationship shown in the drawings only for convenience of description and simplicity of operation, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed in a specific orientation, and be operated, and thus should not be construed as limiting the present invention. Furthermore, the terms "first" and "second" are used only for descriptive purposes and are not intended to be limiting.
The embodiment provides an engine, which comprises a cylinder and a cylinder cover, wherein the cylinder cover is fixedly connected to the top of the cylinder through a fastening bolt and used for closing the cylinder.
In the exhaust process of the engine, the cylinder cover is subjected to the action of explosion pressure of gas in the cylinder and high-temperature fuel gas, and the temperature is very high. The cylinder cover is internally provided with a cooling water cavity, and the cylinder cover is cooled by the water in the cooling water cavity, so that the cylinder cover can bear larger alternating thermal stress and the explosion pressure of an engine.
As shown in fig. 2 and 3, the cylinder head is provided with a mounting hole 5 for mounting the injector 100, the injector 100 is connected with the cylinder head through the mounting hole 5, and a seal ring is arranged between the injector 100 and the cylinder head to ensure the sealing property between the injector 100 and the cylinder head. The fuel system of the engine sprays fuel of a supply system into a combustion chamber through the fuel injector 100, when the engine works, fuel in a cylinder is combusted to generate high-temperature and high-pressure gas, and the working performance and reliability of the engine are directly influenced by the sealing reliability between the fuel injector 100 and the cylinder cover.
The cooling water cavity includes upper water cavity 1 and lower water cavity 2, and upper water cavity 1 and lower water cavity 2 communicate through plug bush cooling chamber 3, and plug bush cooling chamber 3 sets up in sprayer 100's circumference for cooling sprayer 100. The insert sleeve cooling cavity 3 is communicated with the upper water cavity 1 and the lower water cavity 2, meanwhile, the periphery of the oil injector 100 is also forcibly cooled, and the working environment around the oil injector 100 is improved.
The upper water cavity 1 is basin-shaped, and the lower water cavity 2 is annular. The basin-shaped water feeding cavity 1 can evenly distribute force transmitted from the fire surface on the bottom surface of the cylinder cover to the peripheral basin wall, the basin wall transmits the force to the periphery of the cylinder cover, and the periphery of the cylinder cover is exactly provided with the fastening bolts, so that the overall strength of the cylinder cover is enhanced, and the cylinder cover is less in overall deformation when bearing pressure in the cylinder. The annular lower water cavity 2 is directly contacted with a fire surface on the bottom surface of the cylinder cover, and the change of the borne pressure and thermal stress is large.
In the cooling water cavity in the prior art, the water flow in the upper water cavity 1 enters the lower water cavity 2 through the plug bush cooling cavity 3, the flow area of the plug bush cooling cavity 3 is small, so that the water flow entering the annular lower water cavity 2 forms a vortex at the inlet of the lower water cavity 2, and the vortex can guide the water flow to flow towards the upper side far away from the bottom surface of the cylinder cover, and the bottom surface of the cylinder cover is insufficiently cooled.
The cylinder head that this embodiment provided still is provided with cooling water hole 4 between water cavity 1 and the lower water cavity 2, and cooling water hole 4 sets up with the direction slope of keeping away from plug bush cooling chamber 3 with predetermineeing the angle from the one side that is close to plug bush cooling chamber 3, and the rivers that water cavity 1 flowed into lower water cavity 2 from cooling water hole 4 in water cavity 1 can guide water cavity 1 to flow along the cylinder head bottom surface from plug bush cooling chamber 3 rivers that flow into lower water cavity 2.
Under the condition that the weight of the cylinder cover is not increased, water flow entering the lower water cavity 2 through the cooling water holes 4 can increase water flow and take away more heat on one hand; on the other hand, the vortex area can be damaged, the flow loss is reduced, water flow is guided to flow along the bottom surface of the cylinder cover, the bottom surface of the cylinder cover is cooled more fully, the temperature of the cylinder cover is reduced, and the tolerance of the cylinder cover is improved.
Alternatively, the preset angle is phi, which is 55-75 degrees, and phi is the included angle between the axis of the cooling water hole 4 and the bottom surface of the cylinder head. When the included angle between the axis of the cooling water hole 4 and the bottom surface of the cylinder cover is 55 degrees to 75 degrees, the direction of the water flow entering the lower water cavity 2 through the cooling water hole 4 can not only destroy the vortex formed by the water flow entering the inlet of the lower water cavity 2 through the plug bush cooling cavity 3, but also guide the water flow to flow along the length direction of the bottom surface of the cylinder cover, so that the bottom surface of the cylinder cover is fully cooled.
Alternatively, the insert cooling cavity 3 is in a quincunx shape, and the cooling water holes 4 are formed in the side, away from the fuel injector 100, of the quincunx of the insert cooling cavity 3. The interval of the cooling water hole 4 and the outer edge of the plum blossom petal is a preset interval, and the preset interval is set according to the position of the vortex formed by the water flow entering the lower water cavity 2 through the plug bush cooling cavity 3, so that the vortex formed at the inlet of the lower water cavity 2 can be damaged by the water flow entering the lower water cavity 2 through the cooling water hole 4.
Be provided with two intake valves 6 and two exhaust valves 7 on the cylinder head, two intake valves 6 and two exhaust valves 7 enclose the circumference of locating sprayer 100, and the center line of two intake valves 6 is parallel with the center line of two exhaust valves 7, and all is preset the contained angle with the engine main axis, between two exhaust valves 7 to and all be provided with cooling water hole 4 between intake valve 6 and the exhaust valve 7.
Optionally, if the preset included angle is θ, θ is 0 to 70 °. The main axis of the engine is the rotation axis of the crankshaft of the engine, and as shown in the direction of fig. 3, the main axis of the engine is a horizontal line, and the included angle between the central connecting line of the two intake valves 6 and the horizontal line and the included angle between the central connecting line of the two exhaust valves 7 and the horizontal line are both theta, so that the cooling water holes 4 can be ensured to have enough processing space.
The air is fed through the air inlet valve 6 of the cylinder cover, the air entering the cylinder is subjected to explosion pressure and then is discharged from the exhaust valve 7, so that the temperature of the air inlet valve 6 and the surrounding is lower, and cooling is not needed; while the temperature of the exhaust valve 7 and its surroundings will be higher. Therefore, the cooling water hole 4 need not be provided between the intake valve 6 and the intake valve 6.
Alternatively, the plum petals of the insert cooling chamber 3 are arranged between the two exhaust valves 7, and between the intake valve 6 and the exhaust valve 7.
The two intake valves 6 are a first intake valve 61 and a second intake valve 62, respectively, and the two exhaust valves 7 are a first exhaust valve 71 and a second exhaust valve 72, respectively.
The quincunx insert cooling cavity 3 comprises three quincunx petals, namely a first quincunx petal 31 between the first inlet valve 61 and the first exhaust valve 71, a second quincunx petal 32 between the first exhaust valve 71 and the second exhaust valve 72, and a third quincunx petal 33 between the second exhaust valve 72 and the second inlet valve 62.
The cooling water hole 4 includes a first cooling water hole 41, a second cooling water hole 42, and a third cooling water hole 43. The first cooling water hole 41 is provided between the first intake valve 61 and the first exhaust valve 71, and is located on the side of the first quincuncial shape 31 away from the injector 100. The second cooling water hole 42 is provided between the first exhaust valve 71 and the second exhaust valve 72 on a side of the second petal 32 away from the injector 100. The third cooling water hole 43 is provided between the second exhaust valve 72 and the second intake valve 62, on the side of the third petals 33 away from the injector 100.
Alternatively, the cross-sectional area of the cloverleaf between the two exhaust valves 7 is larger than the cross-sectional area of the cloverleaf between the intake valve 6 and the exhaust valve 7.
The first plum petal 31, the second plum petal 32 and the third plum petal 33 are communicated, heat between the two exhaust valves 7 is larger than heat between the exhaust valves 7 and the intake valves 6, heat between the exhaust valves 7 and the intake valves 6 is larger than heat between the two intake valves 6, the cross-sectional area of the first plum petal 31 is equal to that of the third plum petal 33, and the cross-sectional area of the first plum petal 31 and the cross-sectional area of the third plum petal 33 are smaller than that of the second plum petal 32.
Alternatively, the diameter of the cooling water hole 4 between the two exhaust valves 7 is larger than the diameter of the cooling water hole 4 between the intake valve 6 and the exhaust valve 7. That is, the diameter of the first cooling hole and the diameter of the third cooling hole are both smaller than the diameter of the second cooling hole.
It should be noted that the temperature between the two exhaust valves 7 is greater than the temperature between the exhaust valve 7 and the intake valve 6, and the diameter of the cooling water hole 4 between the two exhaust valves 7 is set to be greater than the diameter of the cooling water hole 4 between the exhaust valve 7 and the intake valve 6, so that the water flow area between the two exhaust valves 7 is greater than the water flow area between the exhaust valve 7 and the intake valve 6, thereby increasing the cooling speed between the two exhaust valves 7.
Alternatively, the cross-sectional area of the cooling water hole 4 is S Hole(s) The cross-sectional area of the plum petal is S Flap Then S is Hole(s) ＝S Flap /5～S Valve /3. Such setting can avoid cooling water hole 4 to process too big, and rivers all get into down cavity 2 through cooling water hole 4, reduce plum blossom petal department by a wide marginThe water flow speed of the insert cooling chamber 3 affects the cooling effect of the injector 100.
In the present embodiment, the cross-sectional area of the first cooling water hole 41 is S Hole 1 The cross-sectional area of the first plum petal 31 is S Valve 1 Then S is Hole 1 ＝S Valve 1 /5～S Valve 1 /3. The second cooling water hole 42 has a cross-sectional area S Hole 2 The cross-sectional area of the second plum petal 32 is S Valve 2 Then S is Hole 2 ＝S Valve 2 /5～S Valve 2 /3. The cross sectional area of the third cooling water hole 43 is S Hole 3 The cross-sectional area of the third plum petal 33 is S Flap 3 Then S is Hole 3 ＝S Flap 3 /5～S Flap 3 /3。
The cylinder head that this embodiment provided through set up cooling water hole 4 between last water cavity 1 and lower water cavity 2, can increase discharge to take away more heats. With cooling water hole 4 from being close to the one side of plug bush cooling chamber 3 with the direction slope setting of keeping away from plug bush cooling chamber 3 of angle of predetermineeing, make the rivers that flow into down water chamber 2 from cooling water hole 4 can destroy because of plug bush cooling chamber 3's flow area is little at the vortex district that down water chamber 2 formed, reduce the loss of flowing, improve the smoothness nature that flows, and guide rivers along 2 bottom surfaces of down water chamber flow, strengthen the cooling effect of cylinder head bottom surface, thereby reduce the operating temperature of cylinder head. The cylinder cover can lead water flow to take away more heat under the condition of not increasing the weight, reduce the temperature of the cylinder cover and improve the tolerance of the cylinder cover.
The engine that this embodiment provided, including cylinder and foretell cylinder head, cylinder head fixed connection is in the top of cylinder, through set up cooling water hole 4 in the cylinder head between water cavity 1 and the lower water cavity 2, cooling water hole 4 can not only increase discharge, can destroy the vortex that the rivers that flow into lower water cavity 2 through plug bush cooling chamber 3 formed, and the guide rivers flow along the bottom surface of lower water cavity 2 for the cylinder head bottom surface fully cools off, improves the tolerance ability of cylinder head and the thermal efficiency of engine.
The above description is only for the preferred embodiment of the present invention, and for those skilled in the art, there are variations on the detailed description and the application scope according to the idea of the present invention, and the content of the description should not be construed as a limitation to the present invention.
Claims (10)
1. A cylinder cover comprises a cooling water cavity, wherein the cooling water cavity comprises an upper water cavity (1) and a lower water cavity (2), the upper water cavity (1) is communicated with the lower water cavity (2) through a plug bush cooling cavity (3), and the plug bush cooling cavity (3) is arranged in the circumferential direction of a fuel injector (100) and used for cooling the fuel injector (100); the plug bush cooling device is characterized in that a cooling water hole (4) is further formed between the upper water cavity (1) and the lower water cavity (2), the cooling water hole (4) is close to the side, away from the side, of the plug bush cooling cavity (3) through a preset angle, of the side, the plug bush cooling cavity (3) is inclined and arranged in the direction, the upper water cavity (1) is capable of flowing into the cooling water hole (4), the water flow of the lower water cavity (2) can guide the upper water cavity (1) to flow into the plug bush cooling cavity (3), and the water flow of the lower water cavity (2) is along the bottom surface of the cylinder cover to flow.
2. The cylinder head according to claim 1, wherein the predetermined angle is phi, which is 55 to 75 °, where phi is an angle between an axis of the cooling water hole (4) and the bottom surface of the cylinder head.
3. The cylinder head according to claim 1, wherein the insert cooling chamber (3) is quincunx, and the cooling water holes (4) are provided on a side of the quincunx insert cooling chamber (3) away from the fuel injector (100).
4. A cylinder head according to claim 3, characterized in that the cross-sectional area of the cooling water hole (4) is S Hole(s) The cross section area of the plum petal is S Flap Then S is Hole(s) ＝S Flap /5～S Flap /3。
5. The cylinder head according to claim 3, characterized in that two intake valves (6) and two exhaust valves (7) are arranged on the cylinder head, the two intake valves (6) and the two exhaust valves (7) are arranged around the fuel injector (100), and the central connecting line of the two intake valves (6) is parallel to the central connecting line of the two exhaust valves (7) and forms a preset included angle with the main axis of the engine;
and the cooling water holes (4) are arranged between the two exhaust valves (7) and between the intake valve (6) and the exhaust valve (7).
6. The cylinder head of claim 5, wherein the predetermined angle θ is 0 to 70 °.
7. The cylinder head according to claim 5, characterized in that the diameter of the cooling water hole (4) between the two exhaust valves (7) is larger than the diameter of the cooling water hole (4) between the intake valve (6) and the exhaust valve (7).
8. A cylinder head according to claim 5, characterized in that the plum petals of the insert cooling chamber (3) are provided between the two exhaust valves (7), and between the intake valve (6) and the exhaust valve (7).
9. A cylinder head according to claim 8, characterized in that the cross-sectional area of the cloverleaf between two of the exhaust valves (7) is larger than the cross-sectional area of the cloverleaf between the intake valve (6) and the exhaust valve (7).
10. An engine comprising a cylinder and a cylinder head according to any one of claims 1-9, the cylinder head being fixedly attached to the top of the cylinder.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202221109831.9U CN217481410U (en) | 2022-05-10 | 2022-05-10 | Cylinder head and engine |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202221109831.9U CN217481410U (en) | 2022-05-10 | 2022-05-10 | Cylinder head and engine |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN217481410U true CN217481410U (en) | 2022-09-23 |
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ID=83311065
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202221109831.9U Active CN217481410U (en) | 2022-05-10 | 2022-05-10 | Cylinder head and engine |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN217481410U (en) |
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2022
- 2022-05-10 CN CN202221109831.9U patent/CN217481410U/en active Active
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