CN111075590A - Reinforced cooling type cylinder head and engine - Google Patents
Reinforced cooling type cylinder head and engine Download PDFInfo
- Publication number
- CN111075590A CN111075590A CN201911365531.XA CN201911365531A CN111075590A CN 111075590 A CN111075590 A CN 111075590A CN 201911365531 A CN201911365531 A CN 201911365531A CN 111075590 A CN111075590 A CN 111075590A
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- water
- cylinder head
- cooling
- channel cavity
- water channel
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02F—CYLINDERS, PISTONS OR CASINGS, FOR COMBUSTION ENGINES; ARRANGEMENTS OF SEALINGS IN COMBUSTION ENGINES
- F02F1/00—Cylinders; Cylinder heads
- F02F1/24—Cylinder heads
- F02F1/26—Cylinder heads having cooling means
- F02F1/36—Cylinder heads having cooling means for liquid cooling
- F02F1/40—Cylinder heads having cooling means for liquid cooling cylinder heads with means for directing, guiding, or distributing liquid stream
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01P—COOLING OF MACHINES OR ENGINES IN GENERAL; COOLING OF INTERNAL-COMBUSTION ENGINES
- F01P3/00—Liquid cooling
- F01P3/12—Arrangements for cooling other engine or machine parts
- F01P3/16—Arrangements for cooling other engine or machine parts for cooling fuel injectors or sparking-plugs
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- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Cylinder Crankcases Of Internal Combustion Engines (AREA)
Abstract
The invention discloses an enhanced cooling type cylinder head, which comprises a cylinder head body, wherein a water inlet and a water outlet are formed in the cylinder head body, the water inlet is formed in the lower end surface of the cylinder head body, the water outlet is formed in the highest point of the water level in the cylinder head body, a main water channel cavity, a spark plug water channel cavity and an exhaust passage bridge of the nose water channel cavity are formed in the cylinder head body, the main water channel cavity is communicated with the water inlet and a water outlet hole, cooling water flows in from the water inlet, and the water outlet is discharged to provide timely cooling for the cylinder head body; the spark plug water channel cavity is arranged at the root of the spark plug in a surrounding mode and is communicated with the main water channel cavity, and cooling water circulating in the spark plug water channel cavity provides timely cooling for the root of the spark plug; the exhaust passage bridge water channel cavity is arranged in a bridge area between the two rows of air valves in a shape fitting mode and is communicated with the main water channel cavity, and cooling water circulating in the exhaust passage bridge water channel cavity provides timely cooling for the exhaust passage bridge area.
Description
Technical Field
The invention relates to the technical field of engine cooling, in particular to a reinforced cooling type cylinder head and an engine.
Background
The cylinder head cooling water jacket mainly provides a space and a channel for cooling water for cooling the engine cylinder head, and the cooling water is output by a water pump and then flows into a water channel cavity of the cylinder head through the cylinder body to cool the cylinder head. The cylinder head in the prior art has the following problems: 1. a water channel cavity structure without a cooling exhaust channel nose bridge; the exhaust passage with multiple valves is easy to deform due to high temperature (see figure 11), so that the matching tolerance of the valves and the cylinder head is overlarge, the sealing performance in an engine cylinder is influenced, and the fuel economy is greatly influenced; 2. the cooling part of the spark plug is short or no direct cooling section is arranged, and the temperature of the spark plug is high (see figure 10), so that the spark plug is short in service life at high temperature and is easy to damage; 3. because the spark plug is located higher position of engine position to the mounting hole of spark plug forms one and sinks, form the recess of easy water storage on the engine surface, form ponding easily in the rainy day environment and influence the ignition performance of spark plug, need set up a leak hole and carry out in time the discharge to the rainwater of spark plug mounting hole, avoid the spark plug to lose efficacy because of rainwater soaks, the leak hole among the prior art sets up in cylinder head surface, in order to facilitate the water guide of leak hole, the water course chamber of this position is separated the inside space of water course chamber and is greatly reduced, hinder the flow of water in the water course chamber, do not have sufficient cooling water course chamber space, lead to the water course intracavity mobility poor, whole water course chamber is small, cylinder head cooling is insufficient, the engine temperature is high (see figure 10).
Therefore, in order to solve the above problems, there is a need for an enhanced cooling cylinder head and an engine, which can improve the cooling capacity of an exhaust passage, reduce the temperature of the cylinder head and the temperature of the whole engine, fully cool a spark plug, prolong the service life of the spark plug, improve the cooling capacity of the bridge position of the bridge of the exhaust passage nose, reduce the temperature of the bridge of the exhaust passage nose, reduce the deformation of the bridge of the exhaust passage nose, ensure the sealing performance of an engine combustion chamber, improve the fuel economy, and enhance the overall cooling effect of the engine by improving the cooling water flow path and the cooling water flow space of a cooling water passage cavity of the cylinder head.
Disclosure of Invention
In view of the above, an object of the present invention is to overcome the defects in the prior art, and to provide an enhanced cooling cylinder head and an engine, which can improve the cooling capability of an exhaust passage, reduce the temperature of the cylinder head and the temperature of the entire engine, fully cool a spark plug, prolong the service life of the spark plug, and enhance the cooling effect of the engine.
The invention relates to a reinforced cooling type cylinder head and an engine, which comprises a cylinder head body, wherein the cylinder head body is provided with a water inlet and a water outlet, the water inlet is arranged on the lower end surface of the cylinder head body, cooling water enters the cylinder head body through a water tank, a water pump and a cylinder body through the water inlet to fully cool the cylinder head and then is discharged from the water outlet, the cooling water returns to the water tank to form a complete engine cooling water circulation after being cooled under the action of a radiator, the water outlet is arranged at the highest point of water level in the cylinder head body to ensure that the circulation path of the cooling water in the cylinder head body is long enough to ensure that the cooling water fully absorbs heat and then is discharged from the water outlet by means of the kinetic energy of the cooling water, a main water channel cavity, a spark plug water channel cavity and an exhaust channel cavity of an exhaust channel bridge are arranged in the cylinder head body, the main water channel cavity is, the cavity of the main water channel cavity has large volume, can contain and pass more cooling water, and improves the cooling capacity of the cylinder head; the water channel cavity of the spark plug is arranged at the root of the spark plug in a surrounding manner and communicated with the main water channel cavity, cooling water circulating in the water channel cavity provides timely cooling for the root of the spark plug, the shell of the upper half part of the spark plug is made of ceramic materials, the ceramic part is exposed in the air and can provide good cooling for the upper half part of the spark plug, the lower half part of the spark plug is made of metal materials and is arranged on the cylinder head in a threaded connection manner, and the conventional cylinder head is not provided with a cooling water channel for the thread section of the spark plug, so that the thread section of the root of the spark plug is kept at high temperature for a long time, the service life of the spark plug is shortened. The service life of the spark plug can be prolonged; the exhaust passage bridge water channel cavity is formed in a bridge area between the two exhaust valves in a conformal mode and communicated with the main water channel cavity, cooling water circulating in the exhaust passage bridge water channel cavity provides timely cooling for the exhaust passage bridge area, high temperature of the exhaust passage mainly comes from waste heat of an engine, and the exhaust passage bridge area is poor in heat dissipation due to the fact that metal materials in the exhaust passage bridge area are thick, heat accumulation at the position is caused, deformation is generated, the cooling water in the exhaust passage bridge water channel cavity is formed in the exhaust passage bridge area in a conformal mode and fast flows to provide timely cooling for an exhaust passage area, and the phenomenon that the exhaust passage bridge area deforms excessively is.
Furthermore, the cooling water circulation device further comprises an auxiliary water inlet which is arranged on the lower end face of the cylinder head body and communicated with the exhaust passage bridge water channel cavity, the auxiliary water inlet is used for improving the flowing speed of the cooling water in the exhaust passage bridge water channel cavity, the auxiliary water inlet of the exhaust passage bridge water channel cavity is increased, the cooling water discharged from the cylinder body can directly enter the exhaust passage bridge water channel cavity to cool the exhaust passage bridge area, the cooling water directly enters the exhaust passage bridge water channel cavity through the auxiliary water inlet and then is discharged through the water outlet of the main water channel cavity, and a direct cooling water circulation path is formed.
Furthermore, the water inlet is a plurality of, and shape-adapted sets up terminal surface and main water course chamber intercommunication under the cylinder head body for improve the flow rate of main water course intracavity cooling water, because the restriction of cylinder head and cylinder block terminal surface assembly position, can't set up a great water inlet and satisfy the demand of intaking, can only set up a plurality of water inlets dispersion and intake adaptively, satisfy the demand of cooling water flux and circulation route, and these water inlets all communicate with the cooling water export on the cylinder block terminal surface.
Furthermore, the engine is a double-exhaust valve and double-intake valve engine, the water inlets of the engine can be adjusted adaptively for engines with different valve numbers, and the double-exhaust valve and the double-intake valve are arranged in an array mode.
Furthermore, the water outlet and the third water inlet are arranged opposite to the cylinder head body, the water outlet is located at the middle position close to the first exhaust valve and corresponding to the first intake valve, the circulation path of cooling water is prolonged, and cold water can fully absorb heat to cool the cylinder head.
Furthermore, the spark plug device also comprises a water leakage pipe used for discharging accumulated water in the spark plug groove, wherein the water leakage pipe is used for timely discharging the accumulated water in the spark plug groove, and the spark plug is prevented from being damaged due to long-time soaking in water and influencing the ignition of an engine.
Furthermore, the water leakage pipe penetrates through the inside of the main water channel cavity, so that the highest point of the outer surface of the cylinder head body is not broken, the flowing of internal cooling water is guaranteed, the main water channel cavity does not need to be separated, the cooling water channel is increased, the volume of water filled in the main water channel cavity is increased, the cooling capacity is improved, a notch is formed in the position of the water leakage pipe of the conventional cylinder head, the water channel cavity is separated at the high point of the water level, the flowing of the cooling water in the water channel cavity is blocked, and the volume of the water channel cavity is reduced.
The cylinder head of the engine adopts the reinforced cooling cylinder head, and the whole cooling water circulation path of the engine is more scientific and has better cooling effect.
The invention has the beneficial effects that: according to the enhanced cooling type cylinder head and the engine, the water jacket structure for cooling the bridge of the exhaust passage bridge is additionally arranged, so that the cooling of the bridge area of the exhaust passage bridge is facilitated, the temperature of the cylinder head is reduced, and the temperature of the whole engine is reduced; the water channel cavity of the spark plug is increased, so that the root of the spark plug is fully cooled, and the service life of the spark plug is prolonged; the structure of the water leakage pipe is improved, so that the volume of the main water channel cavity is increased, the flowing of internal cooling water is improved, and the cooling effect of the engine is better.
Drawings
The invention is further described below with reference to the following figures and examples:
FIG. 1 is a schematic diagram of the structure of the present invention;
FIG. 2 is a top view of FIG. 1;
FIG. 3 is a cross-sectional view of FIG. 1;
FIG. 4 is a cross-sectional view of FIG. 1;
FIG. 5 is a cross-sectional view of FIG. 1;
FIG. 6 is a bottom view of FIG. 1;
FIG. 7 is a cross-sectional view taken along the line A-A in FIG. 6;
FIG. 8 is a schematic view of the internal cooling water flow of the present invention;
FIG. 9 is a schematic diagram of a prior art configuration;
FIG. 10 is a cross-sectional view of FIG. 9;
FIG. 11 is a cross-sectional view of FIG. 9;
FIG. 12 is a schematic view of the engine of the present invention.
Detailed Description
Fig. 1 is a schematic view showing the structure of the present invention, fig. 2 is a plan view of fig. 1, fig. 3 is a sectional view of fig. 1, fig. 4 is a sectional view of fig. 1, fig. 5 is a sectional view of fig. 1, fig. 6 is a bottom view of fig. 1, fig. 7 is a sectional view taken along the plane a-a of fig. 6, fig. 8 is a schematic view showing the flow direction of internal cooling water of the present invention, fig. 9 is a schematic view showing the structure of the prior art, fig. 10 is a sectional view of fig. 9, fig. 11 is a sectional view of fig. 9, fig. 12 is a schematic view showing the overall engine of the present invention, as shown, arrows in the drawings show the flow direction of the cooling water in a cylinder head body 1, fig. 9 and 10 and fig. 11 show a water jacket of the prior art, 1a 'shows a cooling water chamber in the water jacket of the prior art, 2' shows a spark, 51' is a spark plug water accumulation groove; the reinforced cooling type cylinder head water jacket and the engine in the embodiment comprise a cylinder head body 1, wherein a water inlet and a water outlet 11 are formed in the cylinder head body 1, the water inlet is formed in the lower end face of the cylinder head body 1, cooling water enters the cylinder head body 1 through the water inlet through a water tank, a water pump and a cylinder body to be fully cooled and then is discharged from the water outlet 11, the cooling water returns to the water tank to form a complete engine cooling water circulation after being cooled under the action of a radiator, the water outlet 11 is formed in the highest point of the water level in the cylinder head body 1 to ensure that the path of the cooling water circulating in the cylinder head body 1 is long enough to ensure that the cooling water fully absorbs heat and then is discharged out of the water outlet 11 by means of the kinetic energy of the cooling water, a main water channel cavity 1a, a spark plug water channel cavity 1b and an exhaust channel cavity 1c are formed in the cylinder head body 1, cooling water flows into the water outlet 11 from the water inlet and is discharged to provide timely cooling for the cylinder head, the cavity body of the main water channel cavity 1a is large in size, more cooling water can be contained and passed through, and the cooling capacity of the cylinder head is improved; the spark plug water channel cavity 1b is arranged at the root of the spark plug 2 in a surrounding mode and is communicated with the main water channel cavity 1a, cooling water circulating in the spark plug water channel cavity provides timely cooling for the root of the spark plug 2, the shell of the upper half part of the spark plug 2 is made of ceramic materials, the ceramic parts are exposed in the air and can provide good cooling for the upper half part of the spark plug 2, the lower half part of the spark plug 2 is made of metal materials and is arranged on a cylinder head in a threaded connection mode, a conventional cylinder head is not provided with a cooling water channel for a threaded section of the spark plug 2, so that the threaded section of the root of the spark plug 2 is kept at high temperature for a long time, the service life of the spark plug 2 is shortened, the spark plug water channel cavity 1b is arranged at the root of the spark plug 2 in a surrounding mode and can provide enough cooling water for the root of the spark plug 2 to, the service life of the spark plug 2 can be prolonged when the spark plug 2 is in a relatively low-temperature working environment; the exhaust passage nose bridge water channel cavity 1c is formed by being fittingly arranged in a nose bridge area between two exhaust valves and communicated with the main water channel cavity 1a, cooling water flowing in the exhaust passage nose bridge area provides timely cooling for the exhaust passage nose bridge area, high temperature of an exhaust passage mainly comes from waste heat of an engine, and because the metal material in the exhaust passage nose bridge area is thick and poor in heat dissipation, heat accumulation at the position is caused, deformation is generated, quick cooling water flowing in the exhaust passage nose bridge water channel cavity 1c formed in the exhaust passage nose bridge position is fittingly arranged to provide timely cooling for an exhaust passage nose bridge area, the phenomenon that the exhaust passage nose bridge area is excessively deformed is avoided, and further.
In this embodiment, still including set up in cylinder head body 1 lower extreme face and with the vice water inlet 12 of exhaust passage bridge water course chamber 1c intercommunication for improve the flow velocity of exhaust passage bridge water course chamber 1c cooling water, increase the vice water inlet 12 of exhaust passage bridge water course chamber 1c, make the cooling water of following exhaust passage bridge water course chamber 1c in can directly entering into and carry out direct cooling to exhaust passage bridge district, the cooling water directly gets into exhaust passage bridge water course chamber 1c through vice water inlet 12 and discharges through main water course chamber 1 a's delivery port 11 again, forms a direct cooling water circulation route.
In this embodiment, the water inlet is a plurality of, and form and shape and set up terminal surface and main water course chamber 1a intercommunication under cylinder head body 1 for improve the flow velocity of main water course chamber 1a internal cooling water, because the restriction of cylinder head and cylinder block terminal surface assembly position, can't set up a great water inlet and satisfy the demand of intaking, can only set up a plurality of water inlets dispersion and intake adaptively, satisfy the demand of cooling water flux and circulation route, and these water inlets all with the cooling water export intercommunication on the cylinder block terminal surface.
In this embodiment, the number of the water inlets is four, and the four water inlets are respectively a first water inlet 13, a second water inlet 14, a third water inlet 15 and a fourth water inlet 16, the first water inlet 13 is disposed at a position close to the first exhaust valve 31, the second water inlet 14 is disposed at a position close to the second exhaust valve 32, the third water inlet 15 is disposed at a position close to the second exhaust valve 32 and the second intake valve 42, and the fourth water inlet 16 is disposed at a position close to the second intake valve 42.
In this embodiment, the water outlet 11 and the third water inlet 15 are disposed opposite to the cylinder head body 1, and the water outlet 11 is located near the middle position of the first exhaust valve 31 corresponding to the first intake valve 41.
In this embodiment, still include the water leakage pipe 5 that is used for discharging 2 recesses 51 pondings of spark plug, water leakage pipe 5 is used for in time discharging 2 recesses 51 pondings of spark plug, avoids spark plug 2 to take place to damage because soak in the aquatic for a long time, influences the ignition of engine.
In this embodiment, the weeping pipe 5 runs through inside the main water course chamber 1a, guarantees the peak of the 1 external surface of cylinder head is not broken off, guarantees the flow of inside cooling water, need not to separate main water course chamber 1a, increases the cooling water passageway, increases the volume of the water of main water course chamber 1a internal water, improves cooling capacity, and the breach is seted up at weeping pipe 5 positions to conventional cylinder head, separates the water course chamber at the water level high point, hinders the flow of cooling water in the cylinder head body 1, reduces water course chamber volume.
The cylinder head of the engine adopts the reinforced cooling cylinder head, and the whole cooling water circulation path of the engine is more scientific and has better cooling effect.
Finally, the above embodiments are only for illustrating the technical solutions of the present invention and not for limiting, although the present invention has been described in detail with reference to the preferred embodiments, it should be understood by those skilled in the art that modifications or equivalent substitutions may be made to the technical solutions of the present invention without departing from the spirit and scope of the technical solutions of the present invention, and all of them should be covered in the claims of the present invention.
Claims (8)
1. An enhanced cooling cylinder head, characterized in that: the cooling water inlet and outlet are arranged on the cylinder head body, the water inlet is arranged on the lower end face of the cylinder head body, the water outlet is arranged at the highest point of a water level in the cylinder head body, a main water channel cavity, a spark plug water channel cavity and an exhaust duct bridge of the nose water channel cavity are arranged in the cylinder head body, the main water channel cavity is communicated with the water inlet and the water outlet hole, cooling water flows in from the water inlet, and the cooling water is discharged from the water outlet to provide timely cooling for the cylinder head body; the spark plug water channel cavity is arranged at the root of the spark plug in a surrounding mode and is communicated with the main water channel cavity, and cooling water circulating in the spark plug water channel cavity provides timely cooling for the root of the spark plug; the exhaust passage bridge water channel cavity is arranged in a bridge area between the two rows of air valves in a shape fitting mode and is communicated with the main water channel cavity, and cooling water circulating in the exhaust passage bridge water channel cavity provides timely cooling for the exhaust passage bridge area.
2. The enhanced cooling cylinder head as set forth in claim 1, wherein: the exhaust passage nose bridge water channel cavity is communicated with the exhaust passage nose bridge water channel cavity, and the auxiliary water inlet is arranged on the lower end face of the cylinder head body and is communicated with the exhaust passage nose bridge water channel cavity, and is used for improving the flowing speed of cooling water in the exhaust passage nose bridge water channel cavity.
3. The enhanced cooling cylinder head as set forth in claim 1, wherein: the plurality of water inlets are arranged on the lower end face of the cylinder head body in a shape-fitting manner and communicated with the main water channel cavity, and the water inlets are used for increasing the flowing speed of cooling water in the main water channel cavity.
4. The enhanced cooling cylinder head as defined in claim 3, wherein: the water inlets are four and are respectively a first water inlet, a second water inlet, a third water inlet and a fourth water inlet, the first water inlet is arranged at the position close to the first exhaust valve, the second water inlet is arranged at the position close to the second exhaust valve, the third water inlet is arranged at the position close to the second exhaust valve and the second intake valve, and the fourth water inlet is arranged at the position close to the second intake valve.
5. The enhanced cooling cylinder head as defined in claim 4, wherein: the water outlet and the third water inlet are arranged opposite to the cylinder head body.
6. The enhanced cooling cylinder head as set forth in claim 1, wherein: the spark plug also comprises a water leakage pipe for discharging accumulated water in the groove of the spark plug.
7. The enhanced cooling cylinder head as defined in claim 6, wherein: the water leakage pipe penetrates through the inner part of the main water channel cavity.
8. An engine, characterized in that: the cylinder head of the engine adopts the reinforced cooling type cylinder head as claimed in any one of claims 1 to 7.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911365531.XA CN111075590A (en) | 2019-12-26 | 2019-12-26 | Reinforced cooling type cylinder head and engine |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911365531.XA CN111075590A (en) | 2019-12-26 | 2019-12-26 | Reinforced cooling type cylinder head and engine |
Publications (1)
| Publication Number | Publication Date |
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| CN111075590A true CN111075590A (en) | 2020-04-28 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201911365531.XA Pending CN111075590A (en) | 2019-12-26 | 2019-12-26 | Reinforced cooling type cylinder head and engine |
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| Country | Link |
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| CN (1) | CN111075590A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112502847A (en) * | 2020-11-27 | 2021-03-16 | 潍柴动力股份有限公司 | Engine cylinder cover and natural gas engine |
| CN113236434A (en) * | 2021-04-27 | 2021-08-10 | 重庆隆鑫机车有限公司 | Cooling water jacket and engine |
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| JP2013015039A (en) * | 2011-07-01 | 2013-01-24 | Suzuki Motor Corp | Cylinder head cooling structure |
| US20150007785A1 (en) * | 2013-07-02 | 2015-01-08 | Yamaha Hatsudoki Kabushiki Kaisha | Engine and saddle type vehicle |
| CN105822451A (en) * | 2016-05-18 | 2016-08-03 | 中国北方发动机研究所(天津) | Diesel engine cylinder cover with cooling water jacket structure |
| CN106593678A (en) * | 2017-01-25 | 2017-04-26 | 无锡开普机械有限公司 | Air cylinder head structure of transverse water-cooling structure |
| DE102017212645A1 (en) * | 2017-07-24 | 2019-01-24 | Bayerische Motoren Werke Aktiengesellschaft | Cylinder head for an internal combustion engine |
| CN109958520A (en) * | 2017-12-22 | 2019-07-02 | 丰田自动车株式会社 | Cylinder cover |
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2019
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Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2013015039A (en) * | 2011-07-01 | 2013-01-24 | Suzuki Motor Corp | Cylinder head cooling structure |
| US20150007785A1 (en) * | 2013-07-02 | 2015-01-08 | Yamaha Hatsudoki Kabushiki Kaisha | Engine and saddle type vehicle |
| CN105822451A (en) * | 2016-05-18 | 2016-08-03 | 中国北方发动机研究所(天津) | Diesel engine cylinder cover with cooling water jacket structure |
| CN106593678A (en) * | 2017-01-25 | 2017-04-26 | 无锡开普机械有限公司 | Air cylinder head structure of transverse water-cooling structure |
| DE102017212645A1 (en) * | 2017-07-24 | 2019-01-24 | Bayerische Motoren Werke Aktiengesellschaft | Cylinder head for an internal combustion engine |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN112502847A (en) * | 2020-11-27 | 2021-03-16 | 潍柴动力股份有限公司 | Engine cylinder cover and natural gas engine |
| CN113236434A (en) * | 2021-04-27 | 2021-08-10 | 重庆隆鑫机车有限公司 | Cooling water jacket and engine |
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