CN212177287U - Cylinder cover with good sealing performance - Google Patents
Cylinder cover with good sealing performance Download PDFInfo
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- CN212177287U CN212177287U CN202022701508.8U CN202022701508U CN212177287U CN 212177287 U CN212177287 U CN 212177287U CN 202022701508 U CN202022701508 U CN 202022701508U CN 212177287 U CN212177287 U CN 212177287U
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Abstract
The utility model relates to a cylinder head, specific cylinder head with good sealing performance that says so, including a plurality of combustion chambers and a plurality of screw rod through-hole, the top of screw rod through-hole is equipped with the counter bore, penetrates fastening screw in every screw rod through-hole. The fastening screw comprises a screw head and a straight screw part, and the lower part of the straight screw part is provided with an external thread matched with a bolt hole of the cylinder. A transition part with the diameter gradually reduced from the screw head to the straight screw part is arranged between the screw head and the straight screw part, the minimum diameter of the transition part is the same as that of the straight screw part, and the diameter of the through hole is larger than that of the straight screw part and smaller than the maximum diameter of the transition part. When the fastening screw penetrates through the screw through hole and is screwed into the bolt hole of the air cylinder, the upper end opening of the screw through hole is positioned on the transition part, and the transition part is clamped on the upper end opening, so that no gap exists between the transition part and the upper end opening. The utility model discloses simple structure, it is sealed effectual.
Description
Technical Field
The utility model relates to a cylinder head, specific cylinder head with good sealing performance that says so.
Background
The cylinder head, which functions to seal the cylinder and together with the piston to form a combustion space, is subjected to high thermal loads due to contact with high temperature gas in addition to the mechanical loads caused by gas forces and tightening of the cylinder bolts, and therefore a good seal is required.
Disclosure of Invention
To above technical problem, the utility model discloses a cylinder head with good sealing performance, the utility model discloses simple structure is sealed effectual.
The utility model relates to a cylinder head with good sealing performance, including a plurality of combustion chambers and a plurality of screw rod through-hole, the top of screw rod through-hole is equipped with the counter bore rather than coaxial setting. Every penetrate fastening screw in the screw rod through-hole, fastening screw includes screw head and straight screw rod portion, the lower part of straight screw rod portion be equipped with the bolt hole assorted external screw thread of cylinder. The screw head with still be equipped with the diameter between the straight screw section and follow the screw head to the transition portion that straight screw section diminishes gradually, the minimum diameter of transition portion with the diameter of straight screw section is the same, the diameter of through-hole is greater than the diameter of straight screw section is less than the maximum diameter of transition portion. When the fastening screw penetrates through the screw through hole and is screwed into the bolt hole of the air cylinder, the upper end opening of the screw through hole is positioned on the transition part, and the transition part is clamped on the upper end opening, so that no gap exists between the transition part and the upper end opening.
Further, the transition part makes a straight line transition from the screw head to the straight screw part.
Further, the transition portion is transited from the screw head to the straight screw portion along an inwardly recessed curve.
Furthermore, the transition part is wrapped by a rubber sealing gasket, and the diameter of the opening at the upper end is larger than the outer diameter of the lower end of the rubber sealing gasket.
Further, the diameter of the screw through hole is gradually reduced from top to bottom, the diameter of the lower end opening of the screw through hole is smaller than the outer diameter of the lower end of the rubber sealing gasket, the rubber sealing gasket extends downwards, and the extending length is equal to the length from the upper end of the straight screw part to the lower end opening when the fastening screw is screwed into the bolt hole of the cylinder.
The utility model has the advantages that: the utility model discloses simple structure, it is sealed effectual, can keep self good performance, increase of service life.
Drawings
The invention will be further explained with reference to the accompanying drawings, which are simplified schematic drawings and which illustrate, by way of illustration only, the basic structure of the invention and do not constitute an undue limitation on the invention:
fig. 1 is a schematic structural view of a cylinder head having good sealing performance according to the present invention;
FIG. 2 is a schematic structural view of a connection portion between a screw through hole and a fastening screw according to a first embodiment of the present invention;
FIG. 3 is a schematic structural view of a connecting portion between a screw through hole and a fastening screw according to a second embodiment of the present invention;
FIG. 4 is a schematic structural view of a connecting portion between a screw through hole and a fastening screw according to a third embodiment of the present invention;
in the figure: 1. the combustion chamber comprises a cylinder cover body, 2 parts of a combustion chamber, 3 parts of counter bores, 4 parts of screw through holes, 41 parts of upper end openings, 42 parts of lower end openings, 5 parts of screw heads, 6 parts of transition parts, 7 parts of straight screw parts, 8 parts of external threads and 9 parts of rubber sealing gaskets.
Detailed Description
It should be noted that the following detailed description is exemplary and is intended to provide further explanation of the disclosure, as the terms used are used to describe particular embodiments only, and are not intended to limit the exemplary embodiments based on the disclosure.
The first embodiment:
as shown in fig. 1 and 2, the present invention relates to a cylinder head with good sealing performance, which comprises a plurality of combustion chambers 2 and a plurality of screw through holes 4. And a counter bore 3 which is coaxial with the screw rod through hole 4 is arranged above the screw rod through hole 4, and a fastening screw rod penetrates into each screw rod through hole 4. The fastening screw comprises a screw head 5 and a straight screw part 7, and the lower part of the straight screw part 7 is provided with an external thread 8 matched with a bolt hole of the cylinder. The fastening screw is screwed into a bolt hole (not shown) of the cylinder through the screw through hole 4, and the screw head 5 is positioned in the counter bore 3.
Screw head 5 with still be equipped with the diameter between the straight screw section 7 and follow screw head 5 to the transition portion 6 that straight screw section 7 diminishes gradually, transition portion 6 certainly screw head 5 to straight screw section 7 straight line transition. The minimum diameter of the transition part 6 is the same as the diameter of the straight screw part 7, and the diameter of the through hole is larger than the diameter of the straight screw part 7 and smaller than the maximum diameter of the transition part 6. When the fastening screw penetrates through the screw through hole 4 and is screwed into the bolt hole of the cylinder, the upper end opening 41 of the screw through hole 4 is positioned on the transition part 6, the fastening screw is screwed downwards, so that the transition part 6 is clamped on the upper end opening 41, no gap exists between the transition part 6 and the upper end opening 41, namely the gap between the upper end opening 41 and the fastening bolt is sealed by the transition part 6, and the cylinder cover has good sealing performance. The transition part 6 is coated with the rubber sealing gasket 9, the minimum outer diameter of the transition part is smaller than the diameter of the upper end opening 41, the sealing performance of the cylinder cover can be further improved due to the arrangement of the rubber sealing gasket 9, the abrasion of the part, close to the upper end opening 41, of the cylinder cover body 1 when fastening bolts are screwed down can be reduced, the good using effect of the cylinder cover is guaranteed, and the service life of the cylinder cover is prolonged.
Second embodiment:
the present invention is basically the same in all the parts and structures except the shape of the transition portion 6 between the second embodiment and the first embodiment. The difference is that, as shown in fig. 3, in the second embodiment of the present invention, the transition portion 6 transitions from the screw head 5 to the straight screw portion 7 along the curve of the inward concave recess.
The third embodiment:
on the basis of the above first or second embodiment, as shown in fig. 4, the diameter of the screw through hole 4 is gradually reduced from top to bottom, the diameter of the lower end opening 42 thereof is smaller than the outer diameter of the lower end of the rubber packing 9, the rubber packing 9 extends downward by the length equal to the length from the upper end to the lower end opening 42 of the straight screw portion 7 when the fastening screw is screwed into the bolt hole of the cylinder. When the fastening bolt is screwed down, since the diameter of the lower end opening 42 of the screw through hole 4 is smaller than the lower end outer diameter of the rubber packing 9, the rubber packing 9 is deformed upward by the screw through hole 4 when being pressed above the lower end opening 42, and when the fastening bolt is screwed down until the dotted line position of the fastening bolt reaches the upper end opening 41 position in fig. 4, the screw through hole 4 and the fastening bolt are sealed by the rubber packing 9 pressed and deformed. Therefore, the lower end opening 42 and the upper end opening 41 of the screw through hole 4 are sealed, and the sealing performance of the cylinder cover is greatly improved.
In the description of the present invention, the terms describing the orientation such as "upper", "lower", "inner", "outer" and the like are all based on the positional relationship shown in the drawings, wherein "inner" and "outer" are based on the central axis of the fastening bolt, and are "inner" when being close to the central axis and "outer" when being far away from the central axis. The above terminology is for the purpose of simplifying the description of the present invention only and is not to be construed as limiting the present invention.
In light of the foregoing, it is to be understood that various changes and modifications may be made by those skilled in the art without departing from the spirit and scope of the invention. The technical scope of the present invention is not limited to the content of the specification, and must be determined according to the scope of the claims.
Claims (5)
1. The utility model provides a cylinder head with good sealing performance, includes a plurality of combustion chambers and a plurality of screw rod through-hole, the top of screw rod through-hole is equipped with rather than the counter bore of coaxial setting, every penetrate fastening screw in the screw rod through-hole, fastening screw includes screw head and straight screw rod portion, the lower part of straight screw rod portion be equipped with the bolt hole assorted external screw thread of cylinder, its characterized in that: the screw rod head with still be equipped with the diameter between the straight screw rod portion from the screw rod head to the transition portion that straight screw rod portion diminishes gradually, the minimum diameter of transition portion is the same with the diameter of straight screw rod portion, the diameter of through-hole is greater than the diameter of straight screw rod portion and is less than the maximum diameter of transition portion, when fastening screw passes the screw rod through-hole twists in the bolt hole of cylinder, the upper end opening of screw rod through-hole is located on the transition portion, just transition portion card is in on the upper end opening, make transition portion with there is not the clearance between the upper end opening.
2. A cylinder head having good sealing performance according to claim 1, wherein: the transition part is in linear transition from the screw head to the straight screw part.
3. A cylinder head having good sealing performance according to claim 1, wherein: the transition part is from the screw head to straight screw part is along the curve transition of inside recess.
4. A cylinder head having good sealing performance according to claim 2 or 3, wherein: the transition portion is wrapped with a rubber sealing gasket, and the diameter of the opening at the upper end is larger than the outer diameter of the lower end of the rubber sealing gasket.
5. The cylinder head having good sealing performance according to claim 4, wherein: the diameter of the screw through hole is gradually reduced from top to bottom, the diameter of the lower end opening of the screw through hole is smaller than the outer diameter of the lower end of the rubber sealing gasket, the rubber sealing gasket extends downwards, and the extending length is equal to the length from the upper end of the straight screw part to the lower end opening when the fastening screw is screwed into the bolt hole of the cylinder.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202022701508.8U CN212177287U (en) | 2020-11-20 | 2020-11-20 | Cylinder cover with good sealing performance |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202022701508.8U CN212177287U (en) | 2020-11-20 | 2020-11-20 | Cylinder cover with good sealing performance |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN212177287U true CN212177287U (en) | 2020-12-18 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202022701508.8U Active CN212177287U (en) | 2020-11-20 | 2020-11-20 | Cylinder cover with good sealing performance |
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| CN (1) | CN212177287U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113236438A (en) * | 2021-06-09 | 2021-08-10 | 中国民用航空飞行学院 | Method for repairing lubricating oil leakage of aviation piston engine casing through bolt |
-
2020
- 2020-11-20 CN CN202022701508.8U patent/CN212177287U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113236438A (en) * | 2021-06-09 | 2021-08-10 | 中国民用航空飞行学院 | Method for repairing lubricating oil leakage of aviation piston engine casing through bolt |
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