CN213989556U - Non-thread spark plug sheath structure - Google Patents
Non-thread spark plug sheath structure Download PDFInfo
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- CN213989556U CN213989556U CN202022741964.5U CN202022741964U CN213989556U CN 213989556 U CN213989556 U CN 213989556U CN 202022741964 U CN202022741964 U CN 202022741964U CN 213989556 U CN213989556 U CN 213989556U
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- spark plug
- diameter
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- sheath
- cylinder head
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Abstract
The utility model discloses a no screw thread spark plug sheath structure relates to engine technical field, and this structure includes spark plug sheath body, spark plug sheath body is sleeve structure, and its inside is provided with the cylindrical cavity of going up to and cylindrical cavity down, it just is linked together with the coaxial setting of cavity down to go up the cavity, the diameter of going up the cavity is greater than cavity diameter down. The utility model discloses a spark plug screw thread compresses tightly, and the cylinder head thread diameter that pairs with it promptly is spark plug thread diameter, has reduced cylinder head installation spark plug sheath screw hole diameter like this greatly, has improved the cylinder head front end and has arranged the space, improves the cylinder head reliability.
Description
Technical Field
The utility model relates to the technical field of engines, especially a no screw thread spark plug sheath structure.
Background
The spark plug is an important element for supporting the work of a gasoline engine, and the spark plug has the function of forming electric sparks at the tip of pulse high-voltage electricity released by an ignition coil and igniting oil-gas mixture in a cylinder to do work. Engines typically include a plurality of fuel-igniting spark plugs that are secured to the cylinder block by a sheath.
The existing spark plug is connected with the internal thread at the front end of a spark plug sheath through threads, the front end of the spark plug sheath is connected with a cylinder cover through the external thread, and the diameter of a cylinder cover threaded hole matched with the spark plug sheath is as follows: the spark plug thread diameter plus 2 spark plug boot front end wall thicknesses plus the spark plug boot internal thread depth plus the spark plug boot external thread depth results in the following problems: 1. the diameter of the threaded hole of the cylinder cover is large, and the arrangement space is insufficient; 2. the spark plug is in threaded connection with a spark plug sheath, the spark plug sheath is in threaded connection with the cylinder cover, and the risk of failure of threaded connection is high due to the fact that multiple threaded connections are formed; 3. the front end of the spark plug sheath is thin in wall thickness, and meanwhile, internal threads and external threads need to be arranged, so that the structure is complex, and the cost is high.
SUMMERY OF THE UTILITY MODEL
Aiming at the problems in the prior art, the utility model provides a non-thread spark plug sheath structure, aiming at solving the problems of large diameter of the thread hole of the cylinder cover of the prior spark plug and insufficient arrangement space; the structure is complex, and the cost is high; the risk of the failure of a plurality of threaded couplings is high.
In order to achieve the purpose, the technical scheme of the utility model is as follows:
the utility model provides a no screw thread spark plug sheath structure, includes spark plug sheath body, spark plug sheath body is the sleeve structure, and its inside is provided with cylindrical cavity on to and cylindrical cavity down, go up the cavity and be linked together with the coaxial setting of cavity down, the diameter of going up the cavity is greater than cavity diameter down.
Preferably, the spark plug boot body is a rubber spark plug boot body. The arrangement can enable the spark plug sheath body to have high wear resistance and elasticity.
Preferably, the spark plug boot body includes a forward portion and a rearward portion, the forward portion having a diameter smaller than a diameter of the rearward portion. The arrangement can facilitate the installation and the removal of the spark plug sheath body.
The utility model has the advantages that:
the utility model provides a pair of no screw thread spark plug sheath structure compresses tightly through the spark plug screw thread, and the cylinder head thread diameter that pairs with it promptly is spark plug thread diameter, has reduced cylinder head installation spark plug sheath screw hole diameter like this greatly, has improved the cylinder head front end and has arranged the space, improves the cylinder head reliability.
Drawings
Fig. 1 is a schematic view illustrating a non-threaded spark plug sheath structure mounted on a cylinder head according to an embodiment of the present invention;
fig. 2 is a schematic diagram of a threadless spark plug sheath structure according to an embodiment of the present invention;
in the figures, 1-cylinder head; 2-spark plug sheath body; 3-a spark plug; 4-upper cavity; 5-lower cavity; 6-a forward extension; 7-rear part; 8-lower end; 9-the lower end surface of the upper cavity body; 10-sheath hole; 11-spark plug hole; 12-the bottom end face of the sheath hole; 13-protruding ring.
Detailed Description
In order to explain the technical content, the achieved objects and the effects of the present invention in detail, the following description is made in conjunction with the embodiments and the accompanying drawings.
Example 1
As shown in fig. 1 and 2, the utility model provides a no screw thread spark plug sheath structure, including spark plug sheath body 2, spark plug sheath body 2 is sleeve structure, and its inside is provided with cylindrical cavity 4 on, and cylindrical cavity 5 down, go up cavity 4 and the coaxial setting of cavity 5 down and be linked together, the diameter of going up cavity 4 is greater than the diameter of cavity 5 down.
As shown in fig. 1 and fig. 2, there are a cylinder head 1 and a spark plug 3, the cylinder head 1 is provided with a sheath hole 10 and a spark plug hole 11, the sheath hole 10 is coaxially arranged with the spark plug hole 11, the spark plug hole 11 is arranged below the sheath hole 10 and communicated with the same, the inner wall of the spark plug hole 11 is provided with an internal thread and is adapted to the external thread of the spark plug 3, the outer wall of the spark plug 3 is provided with a projecting ring 13, when the spark plug sheath body 2 is installed, the front extension part 6 is downward and is installed in the sheath hole 10 in the cylinder head 1, so that the front end surface 8 of the spark plug sheath body 2 is attached to the bottom end surface 12 of the sheath hole; at this moment, the spark plug 3 passes through the inner cavity of the spark plug sheath body 2 and is screwed into the spark plug hole 11 until the upper protruding ring 13 of the spark plug 3 compresses the lower end surface 9 of the upper cavity, and meanwhile, the forward extending part 6 of the spark plug sheath body 2 is in interference fit with the inner wall of the sheath hole 10, so that the sealing of the whole structure is ensured, the sealing of the cooling water cavity and high-pressure gas is realized after the spark plug 3 is installed on the spark plug sheath body 2, and the reliability of the cylinder cover is improved.
Example 2
The rest of this embodiment is the same as embodiment 1, except that the spark plug boot body 2 is a rubber spark plug boot body. The arrangement can enable the spark plug sheath body to have high wear resistance and elasticity.
Example 3
The other parts of this embodiment are the same as those of embodiment 1, except that the spark plug boot body 2 includes a forward portion 6 and a rear portion 7, and the forward portion 6 has a diameter smaller than that of the rear portion 7. The arrangement can facilitate the installation and the extraction of the spark plug sheath body 2, and is favorable for the later maintenance.
Although the invention has been described in detail and with reference to specific embodiments thereof, it will be apparent to one skilled in the art that modifications and improvements can be made thereto. Therefore, such modifications and improvements are intended to be within the scope of the invention as claimed.
Claims (3)
1. The utility model provides a no screw thread spark plug sheath structure, its characterized in that includes spark plug sheath body (2), spark plug sheath body (2) are the sleeve structure, and its inside is provided with cylindrical upper chamber body (4) to and cylindrical lower chamber body (5), upper chamber body (4) and lower chamber body (5) coaxial arrangement and be linked together, the diameter of upper chamber body (4) is greater than lower chamber body (5) diameter.
2. A threadless spark plug boot structure according to claim 1, characterized in that the spark plug boot body (2) is a rubber spark plug boot body.
3. A threadless spark plug boot structure according to claim 1, characterized in that the spark plug boot body (2) comprises a forward portion (6) and a rear portion (7), the forward portion (6) having a smaller diameter than the rear portion (7).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202022741964.5U CN213989556U (en) | 2020-11-24 | 2020-11-24 | Non-thread spark plug sheath structure |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202022741964.5U CN213989556U (en) | 2020-11-24 | 2020-11-24 | Non-thread spark plug sheath structure |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN213989556U true CN213989556U (en) | 2021-08-17 |
Family
ID=77266463
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202022741964.5U Active CN213989556U (en) | 2020-11-24 | 2020-11-24 | Non-thread spark plug sheath structure |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN213989556U (en) |
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2020
- 2020-11-24 CN CN202022741964.5U patent/CN213989556U/en active Active
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