CN207960816U - A kind of connection structure of fuel injector and high-pressure oil pipe - Google Patents
A kind of connection structure of fuel injector and high-pressure oil pipe Download PDFInfo
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- CN207960816U CN207960816U CN201820045673.2U CN201820045673U CN207960816U CN 207960816 U CN207960816 U CN 207960816U CN 201820045673 U CN201820045673 U CN 201820045673U CN 207960816 U CN207960816 U CN 207960816U
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- oil pipe
- fuel injector
- union nut
- pressure oil
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Abstract
A kind of connection structure of fuel injector and high-pressure oil pipe, including fuel injector, high-pressure oil pipe, union nut, fuel injector is arranged on cylinder cap, one end of union nut offers threaded hole, the other end of union nut offers and oil pipe that communicate hole coaxial with threaded hole, one end of union nut is connected to by threaded hole with fuel injector oil pipe, the other end of union nut stretches out after passing through cylinder cap, oil pipe pier nose is connected to fuel injector oil pipe after high-pressure oil pipe passes through oil pipe hole, it is located on high-pressure oil pipe and is arranged with bushing close to the position of oil pipe pier nose, the inner peripheral surface of bushing and the peripheral surface of high-pressure oil pipe are interference fitted, the peripheral surface of bushing is in contact with the inner peripheral surface of union nut, one end that union nut is located at outside cylinder cap is provided with hexagonal flange, and it is arranged with gasket on the end, gasket is connected by bolt with cylinder cap.The design is not only simple in structure, assembles simplicity, and sealing effect is good, service life is long, is simple to manufacture, reliability height.
Description
Technical field
The utility model is related to fuel injector field more particularly to the connection structures of a kind of fuel injector and high-pressure oil pipe, mainly
Suitable for simplifying structure, reducing assembly difficulty.
Background technology
Currently, the connection of high-pressure oil pipe and fuel injector needs one section of high-pressure connecting pipe of intermediate connection（HPC）, HPC is across cylinder
Cover pilot hole and the fuel injector crush seal of casting.Existing diesel high pressure fuel tube assembly is by high-pressure oil pipe, lock sleeve, connection
Nut three kinds of parts composition, antidetonation, it is locking, leak-proof can be good, with reliable, the calibration pressure of compression test under super high is
160MPa.But there are following defects for the prior art：Increase cylinder casting difficulty, while assembling complexity；Existing design can not expire
The sealing demand of sufficient super-pressure fuel pressure, HPC structures are compressed from rear end, more demanding to HPC integral strengths, and
The heads HPC excessive high hardness will produce sealing risk.
Chinese patent, Authorization Notice No. CN202833533U, authorized announcement date are the utility model on March 27th, 2013
A kind of fuel injector high-pressure oil pipe union nut and the sealing structure including the union nut are disclosed, fuel injector is arranged in cylinder cap
On, and in cylinder head cover, high-pressure oil pipe is stretched into cylinder head cover and is connected on fuel injector by union nut, and union nut includes
Turret head head, stop lug and cylindrical plug, and axially penetrate through the tube chamber of entire union nut.Although the utility model is close
It is good to seal effect, but it still has following defect：The utility model mesohigh oil pipe needs to stretch into passes through pipe again in cylinder head cover
Connected nut is connected to fuel injector, and union nut is mounted on by sealing ring on cylinder head cover, and such design is not only complicated, and
And assembly is cumbersome.
Invention content
The purpose of the utility model is to overcome complicated, the cumbersome defect and problem of assembly existing in the prior art,
A kind of connection structure simple in structure, the easy fuel injector and high-pressure oil pipe of assembly is provided.
In order to achieve the above object, the technical solution of the utility model is：A kind of connection of fuel injector and high-pressure oil pipe
Structure, including fuel injector, high-pressure oil pipe, union nut, the fuel injector are arranged on cylinder cap, and the fuel injector oil pipe of fuel injector is logical
It crosses union nut to be connected to high-pressure oil pipe, one end of the union nut offers threaded hole, and the other end of union nut opens up
There are and oil pipe that communicate hole coaxial with threaded hole, one end of the union nut to be connected to fuel injector oil pipe by threaded hole, joins
The other end of pipe nut stretches out after passing through cylinder cap, fuel oil injector of the high-pressure oil pipe behind oil pipe hole and in threaded hole
Pipe is connected to.
The oil pipe hole includes No.1 oil pipe hole and No. two oil pipe holes, and the diameter in No.1 oil pipe hole is more than No. two oil pipes
The diameter in hole, the one end in No.1 oil pipe hole are communicated with No. two oil pipe holes, and the other end in No.1 oil pipe hole is communicated with threaded hole,
The high-pressure oil pipe includes oil pipe ontology and the oil pipe pier nose of its end set, and the oil pipe ontology is plugged in No. two oil pipe holes
Interior, the oil pipe pier nose is located in No.1 oil pipe hole, and the fuel injector oil pipe is connected to after passing through threaded hole with oil pipe pier nose, oil spout
The peripheral surface of device oil pipe is connected with threaded hole.
It is located on the oil pipe ontology and is arranged with bushing, the inner peripheral surface and oil pipe of the bushing close to the position of oil pipe pier nose
The peripheral surface of ontology is interference fitted, and the peripheral surface of bushing is in contact with the inner peripheral surface of union nut.
The union nut is located at one end outside cylinder cap and is provided with flange face, and the structure of the flange face is can twisting knot
Structure.
The structure of the flange face is quadrangle, hexagon, dodecagon, hexagonal flower-shape or flat.
The union nut includes the No.1 linkage section being sequentially communicated, interlude, No. two linkage sections, the No.1 linkage section
It is connected to fuel injector oil pipe, No. two linkage sections are connected to after passing through cylinder cap with flange face, the diameter of the No.1 linkage section, two
The diameter of number linkage section is all higher than the diameter of interlude.
The position being located on No. two linkage sections outside cylinder cap is arranged with gasket, and the gasket passes through bolt and cylinder cap
It is connected.
Compared with prior art, the beneficial effects of the utility model are：
1, one end of union nut offers screw thread in the connection structure of a kind of fuel injector of the utility model and high-pressure oil pipe
Hole, the other end of union nut offer and oil pipe that communicate hole, one end of union nut coaxial with threaded hole and pass through threaded hole
It is connected to fuel injector oil pipe, the other end of union nut stretches out after cylinder cap, and high-pressure oil pipe is behind oil pipe hole and positioned at spiral shell
Fuel injector oil pipe connection in pit, such design are not only simple in structure, and when assembly, the high-pressure oil pipe with union nut
After the hole on cylinder cap, union nut is tightened.Therefore, the utility model is simple in structure, assembly is easy.
2, oil pipe ontology is plugged in No. two oil pipe holes in the connection structure of a kind of fuel injector of the utility model and high-pressure oil pipe
Interior, oil pipe pier nose is located in No.1 oil pipe hole, and fuel injector oil pipe is connected to after passing through threaded hole with oil pipe pier nose, fuel injector oil pipe
Peripheral surface is connected with threaded hole, improves sealing effect；It is located on oil pipe ontology and is arranged with lining close to the position of oil pipe pier nose
Set, adds bushing, reduces high-pressure oil pipe cracking risk；Union nut includes the No.1 linkage section being sequentially communicated, interlude, two
Number linkage section, No.1 linkage section are connected to fuel injector oil pipe, and No. two linkage sections be connected tos after passing through cylinder cap with flange face, and No.1 connects
The diameter of section, the diameter of No. two linkage sections are all higher than the diameter of interlude, and such design not only reduces manufacture difficulty, and
Improve unfailing performance.Therefore, the utility model sealing effect is good, service life is long, is simple to manufacture, reliability height.
3, union nut is located at one end outside cylinder cap in the connection structure of a kind of fuel injector of the utility model and high-pressure oil pipe
It is provided with flange face, the structure of flange face is can twisting structure so that installation is easy with dismounting；It is located at cylinder cap on No. two linkage sections
Outer position is arranged with gasket, and gasket is connected by bolt with cylinder cap, and not only sealing effect is good, but also assembles easy.
Therefore, the utility model assembly is easy, sealing effect is good.
Description of the drawings
Fig. 1 is the structural schematic diagram of the connection structure of a kind of fuel injector of the utility model and high-pressure oil pipe.
Fig. 2 is the vertical view of the connection structure of a kind of fuel injector of the utility model and high-pressure oil pipe.
Fig. 3 is the structural schematic diagram of the utility model mesohigh oil pipe and union nut assembly.
Fig. 4 is the structural schematic diagram of union nut in the utility model.
In figure：Fuel injector 1, high-pressure oil pipe 2, oil pipe ontology 21, oil pipe pier nose 22, union nut 3, threaded hole 31, oil pipe
Hole 32, the oil pipe hole 322 of No.1 oil pipe hole 321, two, flange face 33, No.1 linkage section 34,35, No. two linkage sections 36 of interlude,
Cylinder cap 4, bushing 5, gasket 6, bolt 7, injector plate 8, follower bolt 9, high pressure oil rail 10.
Specific implementation mode
The utility model is described in further detail below in conjunction with description of the drawings and specific implementation mode.
Referring to Fig. 1 to Fig. 4, a kind of connection structure of fuel injector and high-pressure oil pipe, including fuel injector 1, high-pressure oil pipe 2, connection
Pipe nut 3, the fuel injector 1 are arranged on cylinder cap 4, and the fuel injector oil pipe of fuel injector 1 passes through union nut 3 and high-pressure oil pipe 2
Connection, one end of the union nut 3 offer threaded hole 31, and the other end of union nut 3 offers coaxial with threaded hole 31
And the oil pipe hole 32 communicated, one end of the union nut 3 are connected to by threaded hole 31 with fuel injector oil pipe, union nut 3
The other end stretches out after passing through cylinder cap 4, fuel injector oil pipe of the high-pressure oil pipe 2 behind oil pipe hole 32 and in threaded hole 31
Connection.
The oil pipe hole 32 includes No.1 oil pipe hole 321 and No. two oil pipe holes 322, the diameter in No.1 oil pipe hole 321
More than the diameter in No. two oil pipe holes 322, the one end in No.1 oil pipe hole 321 is communicated with No. two oil pipe holes 322, No.1 oil pipe hole
321 other end is communicated with threaded hole 31, and the high-pressure oil pipe 2 includes oil pipe ontology 21 and the oil pipe pier nose of its end set
22, the oil pipe ontology 21 is plugged in No. two oil pipe holes 322, and the oil pipe pier nose 22 is located in No.1 oil pipe hole 321, described
Fuel injector oil pipe is connected to after passing through threaded hole 31 with oil pipe pier nose 22, and the peripheral surface of fuel injector oil pipe is connected with threaded hole 31.
It is located on the oil pipe ontology 21 and is arranged with bushing 5, the inner peripheral surface of the bushing 5 close to the position of oil pipe pier nose 22
It is interference fitted with the peripheral surface of oil pipe ontology 21, the peripheral surface of bushing 5 is in contact with the inner peripheral surface of union nut 3.
The union nut 3 is located at one end outside cylinder cap 4 and is provided with flange face 33, and the structure of the flange face 33 is that can pull
It is twisted structure.
The structure of the flange face 33 is quadrangle, hexagon, dodecagon, hexagonal flower-shape or flat.
The union nut 3 includes 35, No. two linkage sections 36 of No.1 linkage section 34, interlude for being sequentially communicated, and described one
Number linkage section 34 is connected to fuel injector oil pipe, and No. two linkage sections 36 are connected to after passing through cylinder cap 4 with flange face 33, the No.1
The diameter of linkage section 34, No. two linkage sections 36 diameter be all higher than the diameter of interlude 35.
The position being located on No. two linkage sections 36 outside cylinder cap 4 is arranged with gasket 6, and the gasket 6 passes through bolt 7
It is connected with cylinder cap 4.
The principles of the present invention are described as follows：
The design is related to a kind of high-pressure oil pipe union nut for super-pressure fuel system, and union nut one end is equipped with interior
Screw thread, the other end are located at the end in union nut equipped with the oil pipe hole and hexagonal flange, high-pressure oil pipe being inserted into for high-pressure oil pipe
Portion is equipped with the pier nose for preventing high-pressure oil pipe from deviating from, and the length direction between pier nose and union nut along high-pressure oil pipe is arranged with oil pipe
External bushing, bushing are interference fitted with high-pressure oil pipe, and bushing is in contact away from the one side of high-pressure oil pipe with union nut, the work of bushing
With being to allow force part far from high-pressure oil pipe pier nose deformed region, high-pressure oil pipe cracking risk is reduced；High-pressure oil pipe assembly passes through
By tightening the hexagonal flange of union nut one end after the hole of cylinder cap upper end, to be threadedly coupled with fuel injector, and to high compression ignition
Oil is sealed.
Above-mentioned design scheme has been successfully applied to next-generation state's sixfold diesel engine newly developed, which carries
The fuel system of 2500bar, high-pressure oil pipe are directly attached by cylinder cap rocker arm chamber hole with fuel injector, and union nut is worn cylinder and set
Meter reduces the casting difficulty of cylinder cap, while increasing the cooling heat transferring contact surface of cylinder cap, greatly optimizes the heat fatigue of cylinder cap
Characteristic, and other types pass through HPC（High-pressure connecting pipe）It is connect with fuel injector, HPC passes through the duct cast in cylinder cap and oil spout
Device connects, and will certainly occupy a part of cooling-water duct and contact area.In addition, union nut respectively with high pressure oil rail and oil spout
Device connector is connected through a screw thread, and union nut gives axial force transmission to high-pressure oil pipe pier nose part, pier nose again with junction contacts portion
Divide and generate flexible deformation to high pressure fuel crush seal, the program can meet 2500bar superelevation compression ignitions by reliability demonstration
The sealing demand of oil.The design simplifies the connection structure of high-pressure oil pipe and fuel injector, reduces cylinder casting and final assembly
Complexity；Union nut connection improves super-pressure fuel sealing reliability.
Embodiment：
Referring to Fig. 1 to Fig. 4, a kind of connection structure of fuel injector and high-pressure oil pipe, including fuel injector 1, high-pressure oil pipe 2, connection
Pipe nut 3, the fuel injector 1 are arranged on cylinder cap 4, and the fuel injector oil pipe of fuel injector 1 passes through union nut 3 and high-pressure oil pipe 2
Connection, one end of the union nut 3 offer threaded hole 31, and the other end of union nut 3 offers coaxial with threaded hole 31
And the oil pipe hole 32 communicated, one end of the union nut 3 are connected to by threaded hole 31 with fuel injector oil pipe, union nut 3
The other end stretches out after passing through cylinder cap 4, fuel injector oil pipe of the high-pressure oil pipe 2 behind oil pipe hole 32 and in threaded hole 31
Connection；The oil pipe hole 32 includes No.1 oil pipe hole 321 and No. two oil pipe holes 322, and the diameter in No.1 oil pipe hole 321 is more than
The diameter in No. two oil pipe holes 322, the one end in No.1 oil pipe hole 321 are communicated with No. two oil pipe holes 322, No.1 oil pipe hole 321
The other end communicated with threaded hole 31, the high-pressure oil pipe 2 includes the oil pipe pier nose 22 of oil pipe ontology 21 and its end set,
The oil pipe ontology 21 is plugged in No. two oil pipe holes 322, and the oil pipe pier nose 22 is located in No.1 oil pipe hole 321, the spray
Oily device oil pipe is connected to after passing through threaded hole 31 with oil pipe pier nose 22, and the peripheral surface of fuel injector oil pipe is connected with threaded hole 31；Institute
It states to be located on oil pipe ontology 21 and is arranged with bushing 5, inner peripheral surface and the oil pipe ontology of the bushing 5 close to the position of oil pipe pier nose 22
21 peripheral surface interference fit, the peripheral surface of bushing 5 are in contact with the inner peripheral surface of union nut 3；The union nut 3 is located at cylinder
One end outside lid 4 is provided with flange face 33, and the structure of the flange face 33 is hexagon；The union nut 3 includes connecting successively
35, No. two logical No.1 linkage section 34, interlude linkage sections 36, the No.1 linkage section 34 is connected to fuel injector oil pipe, described
No. two linkage sections 36 are connected to after passing through cylinder cap 4 with flange face 33, the diameter of the No.1 linkage section 34, No. two linkage sections 36 it is straight
Diameter is all higher than the diameter of interlude 35；The position being located on No. two linkage sections 36 outside cylinder cap 4 is arranged with gasket 6, described
Gasket 6 is connected by bolt 7 with cylinder cap 4.
Claims (7)
1. the connection structure of a kind of fuel injector and high-pressure oil pipe, including fuel injector（1）, high-pressure oil pipe（2）, union nut（3）, institute
State fuel injector（1）It is arranged in cylinder cap（4）On, fuel injector（1）Fuel injector oil pipe pass through union nut（3）With high-pressure oil pipe（2）
Connection, it is characterised in that：The union nut（3）One end offer threaded hole（31）, union nut（3）The other end open up
Have and threaded hole（31）Oil pipe hole that is coaxial and communicating（32）, the union nut（3）One end pass through threaded hole（31）With spray
Oily device oil pipe connection, union nut（3）The other end pass through cylinder cap（4）After stretch out, the high-pressure oil pipe（2）Across oil pipe hole
（32）Afterwards with positioned at threaded hole（31）Interior fuel injector oil pipe connection.
2. the connection structure of a kind of fuel injector and high-pressure oil pipe according to claim 1, it is characterised in that：The oil pipe hole
（32）Including No.1 oil pipe hole（321）With No. two oil pipe holes（322）, No.1 oil pipe hole（321）Diameter be more than No. two oil
Pore（322）Diameter, No.1 oil pipe hole（321）One end and No. two oil pipe holes（322）It communicates, No.1 oil pipe hole
（321）The other end and threaded hole（31）It communicates, the high-pressure oil pipe（2）Including oil pipe ontology（21）And its end set
Oil pipe pier nose（22）, the oil pipe ontology（21）It is plugged in No. two oil pipe holes（322）It is interior, the oil pipe pier nose（22）Positioned at No.1
Oil pipe hole（321）Interior, the fuel injector oil pipe passes through threaded hole（31）Afterwards with oil pipe pier nose（22）It is connected to, outside fuel injector oil pipe
Circumferential surface and threaded hole（31）It is connected.
3. the connection structure of a kind of fuel injector and high-pressure oil pipe according to claim 2, it is characterised in that：The oil pipe sheet
Body（21）It is upper to be located at close to oil pipe pier nose（22）Position be arranged with bushing（5）, the bushing（5）Inner peripheral surface and oil pipe ontology
（21）Peripheral surface interference fit, bushing（5）Peripheral surface and union nut（3）Inner peripheral surface be in contact.
4. the connection structure of a kind of fuel injector and high-pressure oil pipe according to any one of claim 1-3, feature exist
In：The union nut（3）Positioned at cylinder cap（4）Outer one end is provided with flange face（33）, the flange face（33）Structure be
It can twisting structure.
5. the connection structure of a kind of fuel injector and high-pressure oil pipe according to claim 4, it is characterised in that：The flange face
（33）Structure be quadrangle, hexagon, dodecagon, hexagonal flower-shape or flat.
6. the connection structure of a kind of fuel injector and high-pressure oil pipe according to claim 4, it is characterised in that：The union spiral shell
It is female（3）Including the No.1 linkage section being sequentially communicated（34）, interlude（35）, No. two linkage sections（36）, the No.1 linkage section
（34）It is connected to fuel injector oil pipe, No. two linkage sections（36）Across cylinder cap（4）Afterwards with flange face（33）Connection, the No.1
Linkage section（34）Diameter, No. two linkage sections（36）Diameter be all higher than interlude（35）Diameter.
7. the connection structure of a kind of fuel injector and high-pressure oil pipe according to claim 6, it is characterised in that：No. two companies
Connect section（36）It is upper to be located at cylinder cap（4）Outer position is arranged with gasket（6）, the gasket（6）Pass through bolt（7）With cylinder cap
（4）It is connected.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201820045673.2U CN207960816U (en) | 2018-01-11 | 2018-01-11 | A kind of connection structure of fuel injector and high-pressure oil pipe |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201820045673.2U CN207960816U (en) | 2018-01-11 | 2018-01-11 | A kind of connection structure of fuel injector and high-pressure oil pipe |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN207960816U true CN207960816U (en) | 2018-10-12 |
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ID=63732697
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201820045673.2U Active CN207960816U (en) | 2018-01-11 | 2018-01-11 | A kind of connection structure of fuel injector and high-pressure oil pipe |
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| Country | Link |
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| CN (1) | CN207960816U (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108150327A (en) * | 2018-01-11 | 2018-06-12 | 东风商用车有限公司 | A kind of connection structure of fuel injector and high-pressure oil pipe |
| CN109296487A (en) * | 2018-11-13 | 2019-02-01 | 东风商用车有限公司 | A kind of fuel injector installation positioning tool |
| CN112031971A (en) * | 2020-08-14 | 2020-12-04 | 东风商用车有限公司 | High-pressure oil pipe assembly |
-
2018
- 2018-01-11 CN CN201820045673.2U patent/CN207960816U/en active Active
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108150327A (en) * | 2018-01-11 | 2018-06-12 | 东风商用车有限公司 | A kind of connection structure of fuel injector and high-pressure oil pipe |
| CN109296487A (en) * | 2018-11-13 | 2019-02-01 | 东风商用车有限公司 | A kind of fuel injector installation positioning tool |
| CN112031971A (en) * | 2020-08-14 | 2020-12-04 | 东风商用车有限公司 | High-pressure oil pipe assembly |
| CN112031971B (en) * | 2020-08-14 | 2022-02-18 | 东风商用车有限公司 | High-pressure oil pipe assembly |
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