CN214698083U - Cylinder cover structure of ignition type natural gas engine - Google Patents
Cylinder cover structure of ignition type natural gas engine Download PDFInfo
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- CN214698083U CN214698083U CN202120565608.4U CN202120565608U CN214698083U CN 214698083 U CN214698083 U CN 214698083U CN 202120565608 U CN202120565608 U CN 202120565608U CN 214698083 U CN214698083 U CN 214698083U
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- cylinder head
- valve seat
- seat ring
- natural gas
- mounting hole
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Abstract
The utility model discloses a cylinder head structure of ignition formula natural gas engine, include: the cylinder head comprises a cylinder head body, a cylinder head base plate, a spark plug mounting hole, two air inlet valve seat ring holes and two exhaust valve seat ring holes. The cylinder head base plate is arranged at the bottom of the cylinder head body. The spark plug mounting hole is arranged on the cylinder cover bottom plate. Two air inlet valve seat ring holes are formed in the bottom plate of the cylinder cover. And two exhaust valve seat ring holes are formed in the bottom plate of the cylinder cover, and an unloading groove is formed in a nose bridge area between the two exhaust valve seat ring holes. Therefore, the utility model discloses a cylinder head structure of ignition formula natural gas engine, simple structure is reasonable, and is with low costs, and can effectively reduce the temperature of cylinder head bottom plate to reduce the stress in spark plug mounting hole drill way, prevent the cylinder head fracture, thereby improved the reliability of engine.
Description
Technical Field
The utility model relates to a natural gas engine technical field especially relates to a cylinder head structure of ignition formula natural gas engine.
Background
For a spark-ignition natural gas engine, in order to meet the national six-emission regulations, an equivalent combustion technology is generally adopted, the equivalent combustion technology is higher in temperature in a cylinder compared with a lean combustion technology route, and in the running and stopping processes of the engine, a cylinder cover bottom plate is constantly subjected to alternating action of high and low temperatures, so that the phenomenon of cracking at the connecting line of a spark plug mounting hole of the cylinder cover bottom plate and an air inlet seat ring hole is usually caused.
The hole size of the spark plug mounting hole is often larger because the spark plug mounting hole needs to be arranged on the cylinder head base plate of the ignition type natural gas engine, in order to ensure smooth air intake and exhaust, a four-valve scheme is often adopted, two air intake valve seat ring holes and two exhaust valve seat ring holes are arranged around the periphery of a spark plug mounting hole, in order to ensure the air intake amount, the size of the air inlet valve seat ring hole is larger than that of the air outlet valve seat ring hole, so that the wall thickness between the spark plug mounting hole and the air inlet valve seat ring hole is thinner than that between the spark plug mounting hole and the air outlet valve seat ring hole and that between the four seat ring holes, and the high temperature gas has great thermal stress, so the high wall thickness stress is the main reason of the mounting hole cracking of the cylinder cover spark plug, in order to prevent cracking, the wall thickness between the spark plug mounting hole and the intake seat ring hole needs to be increased, but the wall thickness is often not realized due to structural limitations.
The information disclosed in this background section is only for enhancement of understanding of the general background of the invention and should not be taken as an acknowledgement or any form of suggestion that this information constitutes prior art already known to a person skilled in the art.
SUMMERY OF THE UTILITY MODEL
An object of the utility model is to provide a cylinder head structure of ignition formula natural gas engine, its simple structure is reasonable, and is with low costs, and can effectively reduce the temperature of cylinder head bottom plate to reduce the stress in spark plug mounting hole drill way, prevent the cylinder head fracture, thereby improved the reliability of engine.
In order to achieve the above object, the utility model provides a cylinder head structure of ignition formula natural gas engine, include: the cylinder head comprises a cylinder head body, a cylinder head base plate, a spark plug mounting hole, two air inlet valve seat ring holes and two exhaust valve seat ring holes. The cylinder head base plate is arranged at the bottom of the cylinder head body. The spark plug mounting hole is arranged on the cylinder cover bottom plate. Two air inlet valve seat ring holes are formed in the bottom plate of the cylinder cover. And two exhaust valve seat ring holes are formed in the bottom plate of the cylinder cover, and an unloading groove is formed in a nose bridge area between the two exhaust valve seat ring holes.
In one embodiment of the present invention, the two intake valve seat holes and the two exhaust valve seat holes are arranged around the spark plug mounting hole.
In an embodiment of the present invention, the unloading groove is a concave arc.
In an embodiment of the present invention, the unloading groove is machined by a circular arc cutter.
Compared with the prior art, according to the utility model discloses a cylinder head structure of ignition formula natural gas engine, simple structure is reasonable, and is with low costs, and can effectively reduce the temperature of cylinder head bottom plate to reduce the stress in spark plug mounting hole drill way, prevent the cylinder head fracture, thereby improved the reliability of engine.
Drawings
Fig. 1 is a schematic top view of a cylinder head structure of a spark ignition type natural gas engine according to an embodiment of the present invention;
fig. 2 is a schematic sectional view at a-a in fig. 1.
Description of the main reference numerals:
1-cylinder head base plate, 2-air inlet valve seat ring hole, 3-spark plug mounting hole, 4-exhaust valve seat ring hole, 5-unloading groove, 11-spark plug mounting hole orifice and 12-weak area between spark plug mounting hole and air inlet valve seat ring hole.
Detailed Description
The following detailed description of the present invention is provided in conjunction with the accompanying drawings, but it should be understood that the scope of the present invention is not limited by the following detailed description.
Throughout the specification and claims, unless explicitly stated otherwise, the word "comprise", or variations such as "comprises" or "comprising", will be understood to imply the inclusion of a stated element or component but not the exclusion of any other element or component.
Fig. 1 is a schematic top view of a cylinder head structure of a spark ignition natural gas engine according to an embodiment of the present invention. Fig. 2 is a schematic sectional view at a-a in fig. 1.
As shown in fig. 1 to 2, a cylinder head structure of a spark ignition type natural gas engine according to a preferred embodiment of the present invention includes: the cylinder head comprises a cylinder head body, a cylinder head base plate 1, a spark plug mounting hole 3, two air inlet valve seat ring holes 2 and two exhaust valve seat ring holes 4. The cylinder head base plate 1 is provided at the bottom of the cylinder head body. The spark plug mounting hole 3 is opened in the cylinder head base plate 1. Two air inlet valve seat ring holes 2 are arranged on the cylinder cover bottom plate 1. And two exhaust valve seat holes 4 are arranged on the cylinder cover bottom plate 1, and a nose bridge area between the two exhaust valve seat holes 4 is provided with an unloading groove 5.
In an embodiment of the present invention, two intake valve seat holes 2 and two exhaust valve seat holes 4 are arranged around the spark plug mounting hole 3. The unloading groove 5 is in a concave arc shape. The unloading groove 5 is machined by a circular arc cutter.
In practical application, the utility model discloses a spark-ignition natural gas engine's cylinder head structure, it has intake valve seat circle hole 2 and exhaust valve seat circle hole 4 and spark plug mounting hole 3 to open on the cylinder head bottom plate 1, and the weak regional 12 wall thicknesses between spark plug mounting hole 3 and the intake valve seat circle hole are too thin, cause 11 high capacities cracks of stress in spark plug mounting hole drill way. The utility model discloses the nose bridge zone between two exhaust seat ring holes uses the circular arc sword to get rid of the operation of material attenuate bottom plate, form an off-load groove 5, because the nose bridge zone between two exhaust seat ring holes is the region that the temperature is the highest on the cylinder head bottom plate, can reduce the temperature effectively after getting rid of material attenuate bottom plate here, thereby reduce cylinder head bottom plate 1's thermal energy and reduce the extrusion to spark plug mounting hole 3, spark plug mounting hole drill way 11's stress has been reduced, and because the material has been got rid of in the nose bridge zone between two exhaust seat ring holes, rigidity is reduced, make the extrusion degree to spark plug mounting hole 3 further reduce, spark plug mounting hole drill way 11's stress further obtains releasing. The cylinder cover adopts four-valve arrangement, and four valve retainer holes are arranged around the spark plug mounting hole 3. The unloading groove 5 for reducing the stress of the spark plug mounting hole 3 of the cylinder cover is in a concave arc shape and is tangentially connected with a section of straight line through arcs at two ends, so that smooth transition is ensured, and no stress concentration exists. The maximum depth of the unloading groove 5 is controlled in a proper range, so that the temperature of the bottom plate in the nose bridge region of the row can be effectively reduced, and fatigue cracking caused by insufficient strength of the bottom plate due to over-thinness is avoided. The unloading groove 5 is formed by removing materials in a nose bridge area between two exhaust seat ring holes by using an arc cutter, has a simple structure and low processing cost, and does not influence the air inlet process and performance of the engine.
In a word, the utility model discloses a cylinder head structure of ignition formula natural gas engine, simple structure is reasonable, and is with low costs, and can effectively reduce cylinder head bottom plate 1's temperature to reduce the stress of spark plug mounting hole drill way 11, prevent the cylinder head fracture, thereby improved the reliability of engine.
The foregoing descriptions of specific exemplary embodiments of the present invention have been presented for purposes of illustration and description. It is not intended to limit the invention to the precise form disclosed, and obviously many modifications and variations are possible in light of the above teaching. The exemplary embodiments were chosen and described in order to explain certain principles of the invention and its practical application to enable one skilled in the art to make and use various exemplary embodiments of the invention and various alternatives and modifications as are suited to the particular use contemplated. It is intended that the scope of the invention be defined by the claims and their equivalents.
Claims (4)
1. A cylinder head structure of a spark-ignition natural gas engine, comprising:
a cylinder head body;
a cylinder head base plate provided at a bottom of the cylinder head body;
the spark plug mounting hole is formed in the cylinder head base plate;
the two air inlet valve seat ring holes are formed in the cylinder cover bottom plate; and
the two exhaust valve seat ring holes are formed in the cylinder cover bottom plate, and an unloading groove is formed in a nose bridge area between the two exhaust valve seat ring holes.
2. The cylinder head structure of a spark-ignition natural gas engine of claim 1, wherein said two intake valve seat bores and said two exhaust valve seat bores are arranged around the periphery of said spark plug mounting hole.
3. The cylinder head structure of a spark ignition type natural gas engine as set forth in claim 1, wherein said relief groove has a concave arc shape.
4. The cylinder head structure of a spark ignition type natural gas engine as set forth in claim 1, wherein said relief groove is machined by a circular arc cutter.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202120565608.4U CN214698083U (en) | 2021-03-19 | 2021-03-19 | Cylinder cover structure of ignition type natural gas engine |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202120565608.4U CN214698083U (en) | 2021-03-19 | 2021-03-19 | Cylinder cover structure of ignition type natural gas engine |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN214698083U true CN214698083U (en) | 2021-11-12 |
Family
ID=78572143
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202120565608.4U Active CN214698083U (en) | 2021-03-19 | 2021-03-19 | Cylinder cover structure of ignition type natural gas engine |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN214698083U (en) |
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2021
- 2021-03-19 CN CN202120565608.4U patent/CN214698083U/en active Active
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