CN214063089U - Hollow valve of engine - Google Patents
Hollow valve of engine Download PDFInfo
- Publication number
- CN214063089U CN214063089U CN202021456995.XU CN202021456995U CN214063089U CN 214063089 U CN214063089 U CN 214063089U CN 202021456995 U CN202021456995 U CN 202021456995U CN 214063089 U CN214063089 U CN 214063089U
- Authority
- CN
- China
- Prior art keywords
- cavity
- valve
- engine
- hollow valve
- head
- 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.)
- Expired - Fee Related
Links
- 239000000956 alloy Substances 0.000 claims abstract description 11
- 229910045601 alloy Inorganic materials 0.000 claims abstract description 11
- 238000002844 melting Methods 0.000 claims abstract description 11
- 230000008018 melting Effects 0.000 claims abstract description 11
- 229910052751 metal Inorganic materials 0.000 claims abstract description 11
- 239000002184 metal Substances 0.000 claims abstract description 11
- 230000017525 heat dissipation Effects 0.000 claims abstract description 10
- 239000010410 layer Substances 0.000 claims description 6
- 239000011247 coating layer Substances 0.000 claims description 3
- 150000004767 nitrides Chemical class 0.000 claims description 2
- 238000005121 nitriding Methods 0.000 claims 2
- 230000000694 effects Effects 0.000 abstract description 5
- 238000003754 machining Methods 0.000 abstract description 2
- DGAQECJNVWCQMB-PUAWFVPOSA-M Ilexoside XXIX Chemical compound C[C@@H]1CC[C@@]2(CC[C@@]3(C(=CC[C@H]4[C@]3(CC[C@@H]5[C@@]4(CC[C@@H](C5(C)C)OS(=O)(=O)[O-])C)C)[C@@H]2[C@]1(C)O)C)C(=O)O[C@H]6[C@@H]([C@H]([C@@H]([C@H](O6)CO)O)O)O.[Na+] DGAQECJNVWCQMB-PUAWFVPOSA-M 0.000 description 6
- 229910052708 sodium Inorganic materials 0.000 description 6
- 239000011734 sodium Substances 0.000 description 6
- 238000002485 combustion reaction Methods 0.000 description 3
- 239000007788 liquid Substances 0.000 description 3
- 238000003466 welding Methods 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000001816 cooling Methods 0.000 description 1
- 238000005260 corrosion Methods 0.000 description 1
- 230000007797 corrosion Effects 0.000 description 1
- 239000007789 gas Substances 0.000 description 1
- 230000001050 lubricating effect Effects 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 230000002035 prolonged effect Effects 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
- 239000002912 waste gas Substances 0.000 description 1
- -1 when an engine works Substances 0.000 description 1
Images
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
- Other Surface Treatments For Metallic Materials (AREA)
Abstract
The utility model discloses a hollow valve of engine, including valve head, valve stem portion and valve cavity, low melting point metal or low melting point alloy have been placed in the valve cavity, and the valve cavity includes head cavity and pole portion cavity, the internal surface machining of pole portion cavity has along axially extended helicla flute. The hollow valve greatly improves the heat conduction area by arranging the spiral groove, and further effectively improves the heat dissipation efficiency and the effect.
Description
Technical Field
The utility model relates to an engine part technical field, concretely relates to hollow valve of engine.
Background
The engine valve is divided into an intake valve and an exhaust valve, and the functions of the engine valve are respectively to convey fresh air (or oil-gas mixture) into the combustion chamber and discharge high-temperature waste gas after combustion out of the combustion chamber, so that the working cycle of the engine can be continued. The valve consists of a valve head part and a valve rod part, and the valve head part bears high temperature and high pressure when an engine works, and the cooling and lubricating conditions are poor, so that the valve is required to have certain strength and rigidity, and is high-temperature resistant and wear resistant.
Aiming at the problem of large heat load of the valve head, the existing product starts to adopt a hollow sodium-filled valve, namely a cavity is formed in the valve, metal sodium is placed in the cavity, and due to the low melting point of the sodium, when an engine works, solid sodium in the valve cavity becomes liquid, along with the reciprocating motion of the valve, the liquid sodium in the cavity also reciprocates up and down in the cavity, meanwhile, the heat of the valve head is transmitted to the valve rod part, and then the heat is transmitted to a cylinder cover through a valve guide pipe matched with the valve rod, so that the heat load of the valve, especially the valve head is reduced, and the service life of the valve is prolonged.
At present, the effective area of heat conduction is limited due to the surface area of the cavity inside the valve, and therefore the heat dissipation efficiency and the heat dissipation effect are affected.
SUMMERY OF THE UTILITY MODEL
In view of this, the present invention provides a hollow valve for an engine, so as to improve the heat dissipation efficiency and effect.
The utility model discloses an above-mentioned problem is solved to following technical means:
the hollow valve of the engine comprises a valve head, a valve rod part and a valve cavity, wherein low-melting-point metal or low-melting-point alloy is placed in the valve cavity, the valve cavity comprises a head cavity and a rod part cavity, and a spiral groove extending along the axial direction is machined in the inner surface of the rod part cavity.
Furthermore, a hemispherical groove is machined in the top of the rod cavity.
Further, the rod cavity is a cylindrical cavity.
Furthermore, the sectional area of the rod cavity is gradually increased from one end of the head cavity to one end of the hemispherical groove.
Further, the diameter difference between the maximum sectional area and the minimum sectional area of the rod part cavity is 1-2 mm.
Further, the diameter D of the head cavity is 12-20 mm.
Further, the inner surface of the valve cavity is coated with a nano heat dissipation coating layer.
Further, the low-melting-point metal or the low-melting-point alloy accounts for 2/5-3/5 of the volume of the cavity of the valve.
Further, the outer surface of the valve stem is nitrided to form a nitrided layer.
Further, the thickness of the nitride layer is 0.015-0.025 mm.
The utility model has the advantages that:
the utility model discloses a hollow valve of engine, including valve head, valve stem portion and valve cavity, low melting point metal or low melting point alloy have been placed in the valve cavity, and the valve cavity includes head cavity and pole portion cavity, the internal surface machining of pole portion cavity has along axially extended helicla flute. The hollow valve greatly improves the heat conduction area by arranging the spiral groove, and further effectively improves the heat dissipation efficiency and the effect.
Drawings
The invention is further described with reference to the following figures and examples.
FIG. 1 is an external view of the present invention;
fig. 2 is a cross-sectional view of the present invention;
FIG. 3 is an enlarged schematic view at B;
FIG. 4 is an enlarged schematic view of the head cavity;
FIG. 5 is a schematic view of the melting of a low melting point metal or low melting point alloy.
Detailed Description
The present invention will be described in detail with reference to the accompanying drawings and examples.
As shown in fig. 1 to 5, the present embodiment discloses a hollow engine valve, which includes a valve head 1, a valve stem 2, and a valve cavity 3, where the valve head 1 and the valve stem 2 are coaxially welded at a position a by a welding process such as friction welding. The outer surface of the valve rod part 2 is nitrided to form a nitrided layer with the thickness of 0.015-0.025mm, and the nitrided layer is beneficial to improving the wear resistance and the corrosion resistance. The low-melting-point metal or the low-melting-point alloy 4 is placed in the valve cavity 3, the low-melting-point metal can be metal sodium, in this embodiment, the low-melting-point alloy 4 is selected, and the low-melting-point alloy 4 occupies 2/5-3/5 of the volume of the valve cavity. The valve cavity comprises a head cavity 31 and a rod cavity 32, the diameter D of the head cavity 31 is 12-20mm, a spiral groove 5 extending along the axial direction is processed on the inner surface of the rod cavity 32, and the spiral groove 5 can be a single spiral groove or a double spiral groove.
Specifically, during heat dissipation, as shown in fig. 5, the low melting point alloy 4 is heated and melted into a liquid state, and synchronously reciprocates along with the valve, so that the heat of the valve head 1 is transferred to the valve rod 2, and then is transferred to the cylinder cover through the valve guide pipe matched with the valve rod 2, thereby achieving the purpose of reducing the heat load of the valve, especially the valve head. The hollow valve of this embodiment is adopted, and through setting up helicla flute 5, heat conduction area has been improved greatly, and then has effectively improved radiating efficiency and effect.
As a further improvement to the above solution, the top of the stem cavity 32 is machined with a hemispherical groove 6 to further increase the heat transfer area.
As a further improvement to the above technical solution, the rod cavity 32 is a cylindrical cavity, or the sectional area of the rod cavity 32 gradually increases from one end of the head cavity to one end of the hemispherical groove, and the diameter difference between the maximum sectional area and the minimum sectional area of the rod cavity is 1-2mm, so as to further increase the effective area of heat conduction and ensure the strength of the valve rod.
As a further improvement to the technical scheme, the inner surface of the valve cavity is coated with a nano heat dissipation coating layer. So as to further improve the heat dissipation efficiency.
Finally, 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 the present invention can be modified or replaced by other means without departing from the spirit and scope of the present invention, which should be construed as limited only by the appended claims.
Claims (9)
1. The utility model provides a hollow valve of engine, includes valve head portion, valve stem portion and valve cavity, place low melting point metal or low melting point alloy in the valve cavity, its characterized in that: the valve cavity comprises a head cavity and a rod cavity, and a spiral groove extending along the axial direction is processed on the inner surface of the rod cavity; the inner surface of the valve cavity is coated with a nano heat dissipation coating layer.
2. The engine hollow valve according to claim 1, characterized in that: the top of the rod part cavity is processed with a hemispherical groove.
3. The engine hollow valve according to claim 2, characterized in that: the rod part cavity is a cylindrical cavity.
4. The engine hollow valve according to claim 2, characterized in that: the sectional area of the rod cavity is gradually increased from one end of the head cavity to one end of the hemispherical groove.
5. The engine hollow valve according to claim 4, characterized in that: the diameter difference between the maximum sectional area and the minimum sectional area of the rod part cavity is 1-2 mm.
6. The engine hollow valve according to claim 1, characterized in that: the diameter D of the head cavity is 12-20 mm.
7. The engine hollow valve according to claim 1, characterized in that: the low-melting-point metal or low-melting-point alloy accounts for 2/5-3/5 of the volume of the cavity of the valve.
8. The engine hollow valve according to claim 7, characterized in that: and carrying out nitriding treatment on the outer surface of the valve rod part to form a nitriding layer.
9. The engine hollow valve according to claim 8, characterized in that: the thickness of the nitride layer is 0.015-0.025 mm.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202021456995.XU CN214063089U (en) | 2020-07-22 | 2020-07-22 | Hollow valve of engine |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202021456995.XU CN214063089U (en) | 2020-07-22 | 2020-07-22 | Hollow valve of engine |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN214063089U true CN214063089U (en) | 2021-08-27 |
Family
ID=77384847
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202021456995.XU Expired - Fee Related CN214063089U (en) | 2020-07-22 | 2020-07-22 | Hollow valve of engine |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN214063089U (en) |
-
2020
- 2020-07-22 CN CN202021456995.XU patent/CN214063089U/en not_active Expired - Fee Related
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| PP01 | Preservation of patent right |
Effective date of registration: 20230811 Granted publication date: 20210827 |
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| PP01 | Preservation of patent right | ||
| PD01 | Discharge of preservation of patent |
Date of cancellation: 20231205 Granted publication date: 20210827 |
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| PD01 | Discharge of preservation of patent | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20210827 |
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| CF01 | Termination of patent right due to non-payment of annual fee |