CN116480507A - Sealing structure of fuel injector and engine - Google Patents
Sealing structure of fuel injector and engine Download PDFInfo
- Publication number
- CN116480507A CN116480507A CN202310631374.2A CN202310631374A CN116480507A CN 116480507 A CN116480507 A CN 116480507A CN 202310631374 A CN202310631374 A CN 202310631374A CN 116480507 A CN116480507 A CN 116480507A
- Authority
- CN
- China
- Prior art keywords
- fuel injector
- cylinder cover
- sealing
- bushing
- hole
- 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
Links
- 238000007789 sealing Methods 0.000 title claims abstract description 70
- 239000000446 fuel Substances 0.000 title claims abstract description 51
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 claims description 3
- 229910000831 Steel Inorganic materials 0.000 claims description 3
- 229910052802 copper Inorganic materials 0.000 claims description 3
- 239000010949 copper Substances 0.000 claims description 3
- 239000010959 steel Substances 0.000 claims description 3
- 238000000034 method Methods 0.000 claims description 2
- 239000003921 oil Substances 0.000 description 29
- 239000010705 motor oil Substances 0.000 description 6
- 230000000694 effects Effects 0.000 description 4
- 239000010687 lubricating oil Substances 0.000 description 4
- 238000005266 casting Methods 0.000 description 3
- 230000003749 cleanliness Effects 0.000 description 3
- 238000002485 combustion reaction Methods 0.000 description 2
- 239000010710 diesel engine oil Substances 0.000 description 2
- 238000009434 installation Methods 0.000 description 2
- 230000000149 penetrating effect Effects 0.000 description 2
- 239000010425 asbestos Substances 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000001125 extrusion Methods 0.000 description 1
- 239000003292 glue Substances 0.000 description 1
- 238000002347 injection Methods 0.000 description 1
- 239000007924 injection Substances 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 230000001050 lubricating effect Effects 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000003825 pressing Methods 0.000 description 1
- 229910052895 riebeckite Inorganic materials 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
- F02M61/00—Fuel-injectors not provided for in groups F02M39/00 - F02M57/00 or F02M67/00
- F02M61/14—Arrangements of injectors with respect to engines; Mounting of injectors
-
- 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
-
- 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
-
- 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
-
- 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
- F02F7/00—Casings, e.g. crankcases or frames
Landscapes
- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Fuel-Injection Apparatus (AREA)
Abstract
The invention discloses a sealing structure of an oil sprayer, which comprises the oil sprayer, a cylinder cover and a cylinder cover, wherein the top surface of the cylinder cover is provided with an oil sprayer hole, the oil sprayer is arranged in the oil sprayer hole, and the cylinder cover is arranged on the top surface of the cylinder cover; the fuel injector comprises a fuel injector hole, a fuel injector, a bushing and a second O-shaped ring, wherein the bushing is arranged between the fuel injector hole and the fuel injector, and the inner side of the bushing is in clearance fit with the fuel injector; reaming the upper end of the oil sprayer hole, and forming a counter bore at the upper end of the oil sprayer hole; the upper end of the bushing is higher than the top surface of the cylinder cover, and the cylinder cover is provided with a corresponding yielding groove for avoiding the bushing body higher than the top surface of the cylinder cover; the counter bore is matched with the bushing to form a second sealing groove, and the second sealing ring is installed in the second sealing groove. The invention has the advantages of good sealing performance, stable structure, convenient disassembly and assembly, and the like.
Description
Technical Field
The invention relates to the technical field of fuel injector sealing, in particular to a sealing structure of a fuel injector and an engine.
Background
The effective sealing of the diesel engine oil is one of the preconditions for ensuring the efficient operation of the diesel engine oil, the use of lubricating oil must consider the sealing requirement, and the sealing scheme commonly adopted at present is in the modes of O-shaped ring, sealing rubber gasket, interference and the like.
The cylinder head cover is a cover cap of a sealed valve mechanism on a cylinder head of an engine, and when the engine works, the inner cavity of the cylinder head cover is filled with oil gas containing atomized lubricating oil and liquid lubricating oil splashed by moving parts, and the lubricating oil and the oil gas are required to be completely sealed. Most of the existing cylinder head covers are annular plane belts, sealing glue is generally coated on the sealing belts, or non-asbestos plane gaskets are adopted, or sealing modes such as sealing rubber strips and paper gaskets are adopted, but sealing effects are difficult to ensure, and engine oil leakage phenomenon can occur near an injector of the cylinder head cover in the normal rotation process of a lubricating cam shaft.
The common paper pad for the cylinder head cover is cheap and easy to use. However, when the bolts close to the exhaust side are used for supporting the muffler above or post-treatment, oil leakage is easy to occur due to the influence of heat or up-down vibration.
The prior patent document CN205064158U discloses a transverse cavity type oil injection structure for a diesel engine, which is characterized in that an annular groove is formed in the outer wall of the middle part of an oil injector body, a sealing ring is nested in the annular groove, and the sealing ring is elastically pressed against the inner side wall of an oil injector hole. Although this seal structure can prevent oil from penetrating into the combustion chamber below the injector from the joint face of the injector and the injector hole, the head face spreads over the oil, for example, the joint face seal of the head cover and the head around the injector hole fails, the oil on the head face enters the injector hole, and although the oil is blocked by the seal ring of the existing patent document CN205064158U, the oil is accumulated in the upper region of the seal ring in the injector hole, and the cleanliness is low. Moreover, when the oil injector is disassembled, the sealing ring is invalid in sealing, accumulated engine oil can enter a combustion chamber below the oil injector, and the engine oil burning false image can be caused when the automobile is restarted, so that the automobile fault misjudgment is caused.
As improvement, the periphery of the cylinder cover is sealed by the special-shaped ring, the cylinder cover and the cylinder cover can be directly attached, the deformation is small, and the sealing is reliable. However, due to the arrangement of four air valves, when the periphery of the oil injector is sealed between the cylinder cover and the cylinder cover, the width of the cylinder cover is insufficient, and the special-shaped ring or the O-shaped ring groove cannot be arranged.
For example, for some types, the width of the joint surface of the cylinder head cover surface and the periphery of the fuel injector hole are small, the width of the joint surface of some types is only 5mm, the diameter of the sealing ring is 3mm, the processing precision requirement on the sealing groove is high, and the single side of the joint surface is only 1mm wide, so that the sealing effect of the joint surface is poor, the two sides of the sealing groove are easily damaged, and the top surface structure of the cylinder head is damaged.
The foregoing background is only for the purpose of facilitating an understanding of the principles and concepts of the invention and is not necessarily in the prior art to the present application and is not intended to be used as an admission that such background is not entitled to antedate such novelty and creativity by the present application without undue evidence prior to the present application.
Disclosure of Invention
The invention aims to provide a sealing structure of an oil sprayer, which has good sealing performance, stable structure and convenient disassembly and assembly, and also aims to provide an engine with good sealing performance of the oil sprayer and a cylinder head cover.
Therefore, the invention provides a sealing structure of an oil sprayer and an engine.
Preferably, the present invention may further have the following technical features:
the sealing structure of the fuel injector comprises the fuel injector, a cylinder cover and a cylinder cover, wherein a fuel injector hole is formed in the top surface of the cylinder cover, the fuel injector is arranged in the fuel injector hole, and the cylinder cover is arranged on the top surface of the cylinder cover; the fuel injector comprises a fuel injector hole, a fuel injector, a bushing and a second O-shaped ring, wherein the bushing is arranged between the fuel injector hole and the fuel injector, and the inner side of the bushing is in clearance fit with the fuel injector; reaming the upper end of the oil sprayer hole, and forming a counter bore at the upper end of the oil sprayer hole; the upper end of the bushing is higher than the top surface of the cylinder cover, and the cylinder cover is provided with a corresponding yielding groove for avoiding the bushing body higher than the top surface of the cylinder cover; the counter bore is matched with the bushing to form a second sealing groove, and the second sealing ring is installed in the second sealing groove.
Further, after the second O-ring is deformed by pressing, the second O-ring abuts against the bush.
Further, the distance from the side wall of the counter bore to the inner wall of the oil injector hole is 0.5-1.5 mm greater than the diameter of the second O-shaped ring.
Further, the distance from the side wall of the counter bore to the inner wall of the oil injector hole is 0.5-1 mm greater than the diameter of the second O-shaped ring.
Further, the height of the counterbore is less than the diameter of the second O-ring.
Further, the outside of the liner is in clearance fit with the injector bore, the clearance being less than the clearance between the liner and the injector.
Further, a first sealing groove is formed in the upper portion of the oil sprayer hole, and a first O-shaped ring is arranged in the first sealing groove.
Further, the bushing is a copper sleeve or a steel sleeve.
An engine comprising the sealing structure of the fuel injector of claim 1.
Further, a third sealing groove is formed in the periphery of the bottom surface of the cylinder head cover, a third sealing ring is arranged in the third sealing groove, and the sealing of the inside and the outside of the cylinder head cover is realized by the aid of the third sealing ring.
Compared with the prior art, the invention has the beneficial effects that: through addding the bush, reduce the casting degree of difficulty of cylinder cap, reduce the rejection rate, play the direction transitional effect, simultaneously, the bush exceeds the cylinder cap top surface, can reduce the processing degree of difficulty of bush by a wide margin on the one hand, and on the other hand cooperation counter bore forms the second seal groove, avoids the damage of second O shape circle, still can prevent on the one hand that engine oil from flowing to between bush and the sprayer, guarantees the production dismouting cleanliness of sprayer.
Drawings
Fig. 1 is a top view of the present invention.
Fig. 2 is a sectional view in the direction B-B of fig. 1.
Fig. 3 is an enlarged view at C in fig. 2.
Fig. 4 is a bottom view of the head cover of the present invention.
Fig. 5 is a block diagram of the head top surface of the present invention.
Detailed Description
The invention will be described in further detail with reference to the following detailed description and with reference to the accompanying drawings. It should be emphasized that the following description is merely exemplary in nature and is in no way intended to limit the scope of the invention or its applications.
Non-limiting and non-exclusive embodiments will be described with reference to the following drawings, in which like reference numerals refer to like elements unless otherwise specified.
The sealing structure of the fuel injector comprises a fuel injector 1, a cylinder cover 3 and a cylinder cover 2, wherein a fuel injector hole is formed in the top surface of the cylinder cover 3, the fuel injector 1 is arranged in the fuel injector hole, and the cylinder cover 2 is arranged on the top surface of the cylinder cover. The novel oil sprayer further comprises a bushing 4 and a second O-shaped ring 5, the bushing 4 is arranged between the oil sprayer hole and the oil sprayer 1, the casting precision requirement of the oil sprayer hole is high, and the casting difficulty of the cylinder cover 3 and the rejection rate are reduced by additionally arranging the bushing 4. The inner side of the bushing 4 is in clearance fit with the fuel injector 1, and the outer side of the bushing is in small clearance fit with the fuel injector hole, so that tightness and installation accuracy are ensured. Reaming the upper end of the oil sprayer hole to form a counter bore 6 at the upper end of the oil sprayer hole, wherein the whole oil sprayer hole is of a countersunk structure; the upper end horizontal height of bush 4 is higher than the horizontal height of cylinder cap 3 top surface, the cylinder cap cover 2 is equipped with corresponding groove 8 of stepping down and dodges the bush body that exceeds the cylinder cap 3 top surface avoids bush 4 to interfere the installation of cylinder cap cover 2 fixedly. The counter bore 6 cooperates with the bushing 4 to form a second sealing groove in which the second sealing ring 5 is mounted. In the embodiment, the bushing 4 is higher than the top surface of the cylinder cover 3, so that the processing difficulty of the bushing 4 can be greatly reduced; on the other hand, the second sealing groove is formed by matching with the counter bore 6, so that the second O-shaped ring 5 is prevented from being damaged. If the lining 4 is flush with the top surface of the cylinder cover 3, the processing difficulty is high due to processing errors. If the height of the bushing 4 is lower than the top surface of the cylinder cover 3, the second sealing groove 5 is provided with a notch, and after the second O-shaped ring is extruded, the second O-shaped ring deforms towards the notch, and is likely to be cut by edges of the notch (edges of the upper end of the bushing and edges of the bottom of the counter bore), so that the second O-shaped ring is damaged, and the sealing effect is affected.
In the above embodiment, during assembly, the injector 1 and the bush 4 are assembled to the injector hole on the cylinder cover 3, then the second O-ring 5 is installed in the second sealing groove, then the cylinder cover 2 is assembled to the cylinder cover 3, the second O-ring 5 is pressed by the cylinder cover 2, and then the cylinder cover 3 and the cylinder cover 2 cooperate with the second O-ring 5 to form a sealing surface around the injector 1, so that engine oil on the top surface of the cylinder cover 3 is prevented from penetrating into the injector hole, and the disassembly and assembly cleanliness of the injector 1 is improved. Meanwhile, preferably, after the second O-ring 5 is deformed by extrusion, the second O-ring 5 abuts against the outside of the bush 4 to form a further sealing surface.
Specifically, the distance from the side wall of the counter bore 6 to the inner wall of the fuel injector hole is 0.5-1.5 mm, preferably 0.5-1 mm, greater than the diameter of the second O-ring 5. The height of the counter bore 6 is smaller than the diameter of the second O-ring 5.
The upper portion of sprayer hole has seted up first seal groove, be equipped with first O shape circle 9 in the first seal groove for sealing the joint face of bush 4 and sprayer hole.
The bushing 4 is a copper sleeve or a steel sleeve.
An engine comprises the sealing structure of the fuel injector. Specifically, a third sealing groove is formed in the periphery of the bottom surface of the cylinder head cover 2, a third sealing ring 10 is arranged in the third sealing groove, sealing between the inside and the outside of the cylinder head cover 2 is achieved through the third sealing ring 10, and engine oil on the top surface of the cylinder head 3 is prevented from seeping out of the cylinder head cover 2.
Those skilled in the art will recognize that numerous variations are possible in light of the above description, and that the examples and figures are presented for the purpose of describing one or more particular embodiments only.
While there have been described and illustrated what are considered to be example embodiments of the present invention, it will be understood by those skilled in the art that various changes and substitutions can be made therein without departing from the spirit of the invention. In addition, many modifications may be made to adapt a particular situation to the teachings of the invention without departing from the central concept thereof as described herein. Therefore, it is intended that the invention not be limited to the particular embodiment disclosed, but that the invention will include all embodiments falling within the scope of the invention and equivalents thereof.
Claims (10)
1. The sealing structure of the fuel injector comprises the fuel injector, a cylinder cover and a cylinder cover, wherein a fuel injector hole is formed in the top surface of the cylinder cover, the fuel injector is arranged in the fuel injector hole, and the cylinder cover is arranged on the top surface of the cylinder cover; the method is characterized in that: the fuel injector comprises a fuel injector hole, a fuel injector, a bushing and a second O-shaped ring, wherein the bushing is arranged between the fuel injector hole and the fuel injector, and the inner side of the bushing is in clearance fit with the fuel injector; reaming the upper end of the oil sprayer hole, and forming a counter bore at the upper end of the oil sprayer hole; the upper end of the bushing is higher than the top surface of the cylinder cover, and the cylinder cover is provided with a corresponding yielding groove for avoiding the bushing body higher than the top surface of the cylinder cover; the counter bore is matched with the bushing to form a second sealing groove, and the second sealing ring is installed in the second sealing groove.
2. A seal arrangement for a fuel injector as defined in claim 1, wherein: after the second O-ring is extruded and deformed, the second O-ring is abutted with the bushing.
3. A seal arrangement for a fuel injector as claimed in claim 2, wherein: the distance from the side wall of the counter bore to the inner wall of the oil sprayer hole is 0.5-1.5 mm greater than the diameter of the second O-shaped ring.
4. A seal arrangement for a fuel injector as claimed in claim 2, wherein: the distance from the side wall of the counter bore to the inner wall of the oil sprayer hole is 0.5-1 mm greater than the diameter of the second O-shaped ring.
5. A seal arrangement for a fuel injector as defined in claim 1, wherein: the height of the counter bore is smaller than the diameter of the second O-ring.
6. A seal arrangement for a fuel injector as defined in claim 1, wherein: the outside of the liner is in clearance fit with the injector bore, the clearance being less than the clearance between the liner and the injector.
7. A seal arrangement for a fuel injector as defined in claim 6, wherein: a first sealing groove is formed in the upper portion of the oil sprayer hole, and a first O-shaped ring is arranged in the first sealing groove.
8. A seal arrangement for a fuel injector as defined in claim 1, wherein: the bushing is a copper sleeve or a steel sleeve.
9. An engine, characterized in that: a seal structure comprising the fuel injector of claim 1.
10. An engine as set forth in claim 9 wherein: the third sealing groove is formed in the periphery of the bottom surface of the cylinder cover, a third sealing ring is arranged in the third sealing groove, and the sealing of the inside and the outside of the cylinder cover is realized by the aid of the third sealing ring.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202310631374.2A CN116480507A (en) | 2023-05-31 | 2023-05-31 | Sealing structure of fuel injector and engine |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202310631374.2A CN116480507A (en) | 2023-05-31 | 2023-05-31 | Sealing structure of fuel injector and engine |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN116480507A true CN116480507A (en) | 2023-07-25 |
Family
ID=87221635
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202310631374.2A Pending CN116480507A (en) | 2023-05-31 | 2023-05-31 | Sealing structure of fuel injector and engine |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN116480507A (en) |
-
2023
- 2023-05-31 CN CN202310631374.2A patent/CN116480507A/en active Pending
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| PB01 | Publication | ||
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