CN112012866A - Spark plug sheath structure - Google Patents
Spark plug sheath structure Download PDFInfo
- Publication number
- CN112012866A CN112012866A CN202010145834.7A CN202010145834A CN112012866A CN 112012866 A CN112012866 A CN 112012866A CN 202010145834 A CN202010145834 A CN 202010145834A CN 112012866 A CN112012866 A CN 112012866A
- Authority
- CN
- China
- Prior art keywords
- spark plug
- cylinder cover
- sheath
- plug sheath
- wall
- 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.)
- Pending
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Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02P—IGNITION, OTHER THAN COMPRESSION IGNITION, FOR INTERNAL-COMBUSTION ENGINES; TESTING OF IGNITION TIMING IN COMPRESSION-IGNITION ENGINES
- F02P13/00—Sparking plugs structurally combined with other parts of internal-combustion engines
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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
- F02F1/242—Arrangement of spark plugs or injectors
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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
- F02F11/00—Arrangements of sealings in combustion engines
- F02F11/002—Arrangements of sealings in combustion engines involving cylinder heads
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01T—SPARK GAPS; OVERVOLTAGE ARRESTERS USING SPARK GAPS; SPARKING PLUGS; CORONA DEVICES; GENERATING IONS TO BE INTRODUCED INTO NON-ENCLOSED GASES
- H01T13/00—Sparking plugs
- H01T13/02—Details
- H01T13/06—Covers forming a part of the plug and protecting it against adverse environment
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01T—SPARK GAPS; OVERVOLTAGE ARRESTERS USING SPARK GAPS; SPARKING PLUGS; CORONA DEVICES; GENERATING IONS TO BE INTRODUCED INTO NON-ENCLOSED GASES
- H01T13/00—Sparking plugs
- H01T13/02—Details
- H01T13/08—Mounting, fixing or sealing of sparking plugs, e.g. in combustion chamber
Landscapes
- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Ignition Installations For Internal Combustion Engines (AREA)
Abstract
The invention discloses a spark plug sheath structure, which comprises a spark plug sheath arranged on a cylinder cover, wherein the outer wall of the inner end of the spark plug sheath is provided with a threaded sleeve, the threaded sleeve is in threaded connection with the cylinder cover, and the outer wall of the outer end of the spark plug sheath is provided with an installation sealing surface directly attached to the cylinder cover; the inner wall of the outer end of the spark plug sheath is provided with a spark plug mounting plane attached to the spark plug. The spark plug is arranged on the spark plug mounting plane and is not directly contacted with the cylinder cover, so that the temperature can be effectively reduced, and the service life of the spark plug is prolonged. Meanwhile, the spark plug also plays a role in compressing the spark plug sheath, so that the sealing effect is further enhanced.
Description
Technical Field
The invention relates to the technical field of sealing structures, in particular to a spark plug sheath structure.
Background
In natural gas fueled engines, the fuel is ignited by a spark plug. For medium and heavy gas engines, the spark plug is typically mounted in the cylinder head and in a spark plug boot to isolate the cooling fluid inside the cylinder head. The natural gas engine has the requirement of replacing the spark plug regularly, and the working environment of the spark plug requires isolating media such as cooling water, lubricating oil and the like, so that reliable sealing around the spark plug is very important for the reliability of the natural gas engine.
The prior art is a patent No. CN201320697240.2, which is named as a novel sparking plug steel sleeve sealing structure, wherein a sparking plug is directly screwed on a cylinder cover, the sheath only has a sealing function, and the sheath and the cylinder cover are sealed by a copper gasket. The protective sleeve is tightly pressed while the protective sleeve is screwed into the cylinder cover by a threaded sleeve. According to the scheme, the plane of the spark plug is directly contacted with the cylinder cover, so that the temperature is high, and the service life of the spark plug is influenced. The sheath is only sealed by the end face and is indirectly pressed by other parts (threaded sleeves), and the sealing is not firm. The bottom surface of the cylinder cover is tapped with threads, so that the hidden trouble of the cracking of the cylinder cover is caused.
The main disadvantages of the above prior art include the following:
1. the plane of the spark plug is directly contacted with the cylinder cover, the temperature is high, and the service life of the spark plug is influenced;
2. the sheath is only pressed by the threaded sleeve, so that sealing failure is easily caused;
3. the bottom surface of the cylinder cover is tapped with threads, so that the hidden danger of the cracking of the cylinder cover exists.
Disclosure of Invention
In view of the above problems, the present invention provides a spark plug sheath structure, in which a spark plug is mounted on a spark plug mounting plane without directly contacting with a cylinder head, so as to effectively reduce the temperature and prolong the life of the spark plug. Meanwhile, the spark plug also plays a role in compressing the spark plug sheath, so that the sealing effect is further enhanced.
The invention adopts the following technical scheme to realize the purpose:
a spark plug sheath structure comprises a spark plug sheath arranged on a cylinder cover, wherein the outer wall of the inner end of the spark plug sheath is provided with a threaded sleeve, the threaded sleeve is in threaded connection with the cylinder cover, and the outer wall of the outer end of the spark plug sheath is provided with an installation sealing surface directly attached to the cylinder cover; the inner wall of the outer end of the spark plug sheath is provided with a spark plug mounting plane attached to the spark plug.
Preferably, the cylinder cover is provided with a cylinder cover spark plug mounting hole, and the spark plug is mounted on the spark plug sheath through the cylinder cover spark plug mounting hole.
Preferably, the bottom of the spark plug mounting hole of the cylinder cover is provided with a counter bore and a fillet.
Preferably, a sealing ring is arranged between the cylinder cover and the spark plug sheath, the sealing ring is arranged in an installation groove in the cylinder cover, and the number of the sealing rings is not less than two.
Preferably, the contact surface of the mounting sealing surface and the cylinder head is coated with a sealant.
The invention has the beneficial effects that:
1. the spark plug is arranged on the spark plug mounting plane and is not directly contacted with the cylinder cover, so that the temperature can be effectively reduced, and the service life of the spark plug is prolonged. According to the test conditions, the temperature of the spark plug can be reduced by about 60 ℃, and the reliability and the service life of the spark plug can be increased by about 2500 h. Meanwhile, the spark plug also plays a role in compressing the spark plug sheath, so that the sealing effect is further enhanced.
2. The bottom of the spark plug mounting hole of the cylinder cover is provided with the counter bore and the round angle, and the threads do not penetrate through the bottom surface of the cylinder cover, so that the cracking fault of the cylinder cover can be effectively avoided.
3. And the joint surface of the mounting sealing surface and the cylinder cover is coated with sealant, so that the sealing effect is further enhanced.
Drawings
Fig. 1 is a schematic structural diagram of a spark plug sheath structure provided by the invention.
In the figure, 1-cylinder cover, 2-spark plug sheath, 3-screw sleeve, 4-mounting sealing surface, 5-spark plug, 6-spark plug mounting plane, 7-sealing ring and 11-cylinder cover spark plug mounting hole.
Detailed Description
The present invention will be described in detail with reference to the accompanying fig. 1 and the embodiments.
Referring to fig. 1, an embodiment of the present invention provides a spark plug sheath structure, including a spark plug sheath 2 mounted on a cylinder head 1, wherein an inner end outer wall of the spark plug sheath 2 is provided with a threaded sleeve 3, the threaded sleeve 3 is in threaded connection with the cylinder head 1, and an outer end outer wall of the spark plug sheath 2 is provided with a mounting sealing surface 4 directly attached to the cylinder head 1; the inner wall of the outer end of the spark plug sheath 2 is provided with a spark plug mounting plane 6 attached to the spark plug 5.
When the spark plug sheath structure is used, the mounting sealing surface 4 is directly attached to the cylinder cover 1, so that the sealing performance of the spark plug sheath 2 and the cylinder cover 1 is ensured. The screw sleeve 3 is connected with the cylinder cover 1 by screw threads, so that the cylinder cover 1 presses the spark plug sheath 2 from the upper part. The spark plug 5 is arranged on the spark plug mounting plane 6 and is not directly contacted with the cylinder cover 1, so that the temperature can be effectively reduced, and the service life of the spark plug 5 is prolonged. Meanwhile, the spark plug 5 also plays a role in compressing the spark plug sheath 2, and the sealing effect is further enhanced.
Further, a cylinder head spark plug mounting hole 11 is formed in the cylinder head 1, and the spark plug 5 is screwed to the spark plug sheath 2 through the cylinder head spark plug mounting hole 11. The bottom of the spark plug mounting hole 11 of the cylinder cover is provided with a counter bore and a round angle, so that mounting threads do not penetrate through the bottom surface of the cylinder cover 1, and the cracking fault of the cylinder cover 1 can be effectively avoided.
Further, a sealing ring 7 is arranged between the cylinder cover 1 and the spark plug sheath 2, and the sealing ring 7 is arranged in an installation groove in the cylinder cover 1, so that the cylinder cover 1 is connected with the spark plug sheath 2 in an interference fit manner, and a sealing effect is achieved. The number of the sealing rings 7 is not less than two, so that the sealing effect between the cylinder cover 1 and the spark plug sheath 2 is further enhanced. In the present embodiment, two seal rings 7 are provided.
Further, when the spark plug sheath 2 is installed, the contact surface of the installation sealing surface 4 and the cylinder cover 1 is coated with sealant so as to ensure the sealing between the spark plug sheath 2 and the cylinder cover 1 and further enhance the sealing effect.
Although the invention has been described in detail above with reference to specific embodiments, it will be apparent to one skilled in the art that modifications or improvements may be made based on the invention. Accordingly, such modifications and improvements are intended to be within the scope of the invention as claimed.
Claims (5)
1. A spark plug sheath structure is characterized by comprising a spark plug sheath (2) arranged on a cylinder cover (1), wherein the outer wall of the inner end of the spark plug sheath (2) is provided with a threaded sleeve (3), the threaded sleeve (3) is in threaded connection with the cylinder cover (1), and the outer wall of the outer end of the spark plug sheath (2) is provided with an installation sealing surface (4) directly attached to the cylinder cover (1); the inner wall of the outer end of the spark plug sheath (2) is provided with a spark plug mounting plane (6) attached to the spark plug (5).
2. The spark plug boot structure according to claim 1, wherein a cylinder head spark plug mounting hole (11) is formed in the cylinder head (1), and the spark plug (5) is mounted on the spark plug boot (2) through the cylinder head spark plug mounting hole (11).
3. The spark plug boot structure according to claim 2, wherein a counterbore and a fillet are provided at the bottom of the cylinder head spark plug mounting hole (11).
4. The spark plug sheath structure according to claim 1, characterized in that a sealing ring (7) is arranged between the cylinder cover (1) and the spark plug sheath (2), the sealing ring (7) is arranged in an installation groove on the cylinder cover (1), and the number of the sealing rings (7) is not less than two.
5. The spark plug boot structure according to claim 1, wherein the contact surface of the mounting seal surface (4) with the cylinder head (1) is coated with a sealant.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010145834.7A CN112012866A (en) | 2020-03-05 | 2020-03-05 | Spark plug sheath structure |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010145834.7A CN112012866A (en) | 2020-03-05 | 2020-03-05 | Spark plug sheath structure |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN112012866A true CN112012866A (en) | 2020-12-01 |
Family
ID=73506762
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202010145834.7A Pending CN112012866A (en) | 2020-03-05 | 2020-03-05 | Spark plug sheath structure |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN112012866A (en) |
-
2020
- 2020-03-05 CN CN202010145834.7A patent/CN112012866A/en active Pending
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