CN205955884U - Diesel oil is rail system sprayer altogether - Google Patents
Diesel oil is rail system sprayer altogether Download PDFInfo
- Publication number
- CN205955884U CN205955884U CN201620957271.0U CN201620957271U CN205955884U CN 205955884 U CN205955884 U CN 205955884U CN 201620957271 U CN201620957271 U CN 201620957271U CN 205955884 U CN205955884 U CN 205955884U
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- CN
- China
- Prior art keywords
- needle
- valve body
- cavity
- valve
- injector
- 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.)
- Expired - Fee Related
Links
- 239000002283 diesel fuel Substances 0.000 title abstract description 4
- 239000000446 fuel Substances 0.000 claims description 43
- 239000007921 spray Substances 0.000 claims description 2
- 239000003921 oil Substances 0.000 description 50
- 238000007789 sealing Methods 0.000 description 9
- 230000000694 effects Effects 0.000 description 5
- 239000000295 fuel oil Substances 0.000 description 4
- 238000002347 injection Methods 0.000 description 3
- 239000007924 injection Substances 0.000 description 3
- 230000007423 decrease Effects 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000012141 concentrate Substances 0.000 description 1
- 239000008358 core component Substances 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000000977 initiatory effect Effects 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000000630 rising effect Effects 0.000 description 1
- 239000000779 smoke Substances 0.000 description 1
- 239000000243 solution Substances 0.000 description 1
Landscapes
- Fuel-Injection Apparatus (AREA)
Abstract
The utility model provides a pair of diesel oil is rail system sprayer altogether, including injector, nozzle valve and tight cap, injector and nozzle valve are located tight cap cavity, the injector lower extreme is connected with tight cap upper end, nozzle valve lower extreme and tight cap lower extreme axial fixity, injector lower extreme and radial the fixing in nozzle valve upper end, the terminal surface is equipped with the step hole under the injector, be equipped with the sprayer cavity in the injector, sprayer cavity lower extreme is equipped with the spring holder, be equipped with the spring seat chamber body in the spring holder, the internal control piston that is equipped with of spring seat chamber, the spring holder top is equipped with the spring, be equipped with high -pressure oil duct in the injector, nozzle valve upper end and injector contact personally submits interior spill, be equipped with the nozzle valve cavity in the nozzle valve, nozzle valve cavity lower extreme is equipped with the nozzle, be equipped with the needle valve in the nozzle valve cavity. The utility model provides a diesel oil is rail system sprayer altogether leakproofness is good, safe and reliable.
Description
Technical field
This utility model is related to fuel injector technical field, specifically a kind of diesel common rail system fuel injector.
Background technology
Diesel common rail system fuel injector is the core component of common rail for diesel engine fuel injection system, common-rail injector
Performance directly influences the performance of whole diesel engine.
Now, increasingly stricter Abgasgesetz makes the fuel-injection pressure more and more higher of diesel engine, each feature contacts
Face easily the not enough phenomenon of sealability under high fuel pressure, fuel leakage including at tight cap of oil nozzle,
This will result in fuel pressure in oil-fuel injector needle-valve body and declines, and reduces the accuracy of fuel injector distributive value, simultaneously the increasing of leakage rate
Plus lead to oil return of oil injector amount to increase, increased the load of high-pressure fuel-feed pump.More serious even because diesel oil leaks into electromotor
Lead to catch fire on smoke exhaust pipe or supercharger, initiation fire.
The oil injector body of common-rail injector and needle-valve body are in close contact under the assembly pretightening power effect of the tight cap of fuel injector, with
Sealing high pressure fuel.The raising of fuel-injection pressure proposes higher to the sealing property of oil injector body and needle-valve body composition surface
Require.
Utility model content
The purpose of this utility model is to solve the above problems, and designs a kind of good airproof performance, using safe diesel common rail
System fuel injector.
The technical scheme in the invention for solving the technical problem is：
A kind of diesel common rail system fuel injector, including oil injector body, needle-valve body and tight cap, is characterized in that, described tight cap is
The cavity body structure of hollow, described oil injector body and needle-valve body are located in tight cap cavity, described oil injector body lower end and tight cap upper end
Connect, described needle-valve body lower end is fixed in the axial direction with tight cap upper end, described oil injector body lower end and needle-valve body upper end are radially
Upper fixation, on described oil injector body lower surface, centre position is provided with stepped hole, and in described oil injector body, axial location is provided with oil spout
Device cavity, in described fuel injector cavity, lower end is provided with spring base, and described spring base lower surface is provided with groove I, outside described spring base
It is provided with pressure spring chamber between the face of cylinder and fuel injector cavity inner wall, in described spring base, be provided with spring base cavity, described spring
It is provided with control piston in seat cavity, above described fuel injector cavity inner spring seat, is provided with spring, described spring housing is controlling piston
On, described lower spring end is contacted with spring base upper surface, is provided with high-pressure oil duct in described oil injector body, described needle-valve body upper end with
The face that oil injector body contacts is in concave shaped, and in described needle-valve body, axial location is provided with needle-valve body cavity, described needle-valve body cavity
Inwall centre position is provided with groove II, and needle-valve body cavity is divided into needle-valve body upper cavity and needle-valve body lower chamber by described groove II,
Described needle-valve body lower chamber lower end inner wall is set to taper surface, and described needle-valve body cavity lower end taper surface is diametrically provided with nozzle,
It is provided with needle-valve in described needle-valve body cavity；The segment axis that described high-pressure oil duct is located in needle-valve body and needle-valve body axes intersect,
Described high-pressure oil duct lower end is communicated with groove II.
Further, described tight cap upper end is provided with female thread, and described oil injector body lower end is corresponding to tight cap upper end female thread
Position be provided with external screw thread, be connected by screw thread between described oil injector body lower end and tight cap upper end.
Described tight cap cavity inner wall lower end is provided with ladder II, and described needle-valve body centre position external cylindrical surface is provided with ladder I,
Described ladder I lower surface is contacted with the cooperation of ladder II upper surface.
Described oil injector body lower surface is provided with the pin-and-hole I of symmetrical distribution, described needle-valve body upper surface and oil injector body
The corresponding position of lower surface pin-and-hole I is respectively equipped with pin-and-hole II, is provided with alignment pin between described pin-and-hole I and pin-and-hole II.
It is fan-shaped symmetrical that described stepped hole is shaped as left and right, outside the stepped hole of described oil injector body lower surface and needle-valve body
Upper surface contacts.
The face that described needle-valve body upper end is contacted with oil injector body is near axis with respect to indent at away from axis.
Described needle-valve is multidiameter, and described needle-valve top is big end, and described needle-valve bottom is small end, described needle-valve big end circle
Between cylinder and needle-valve body upper cavity inwall, sealing cooperation, sets between the described needle-valve small end face of cylinder and needle-valve body lower chamber inwall
There is gap, described needle-valve small end lower surface position corresponding with needle-valve body lower chamber lower end taper surface is provided with conical protrusions, institute
State valve small end lower end conical protrusions taper seat to contact with the cooperation of needle-valve body lower chamber lower end taper surface.
The beneficial effects of the utility model are：
1st, the diesel common rail system fuel injector needle valve body upper surface that this utility model provides is in inner concave shape, and it is at axis
With respect to away from indent at axis, described concave inward structure decreases the contact area of needle-valve body and oil injector body, improves contact
Pressure, and needle-valve body upper surface outer edge can be made to form high pressure contact surface.
2nd, the diesel common rail system fuel injector that this utility model provides is milled a part at axis, forms step
Hole, contacts so that outside the stepped hole of oil injector body lower surface with needle-valve body upper surface outside the stepped hole of described oil injector body lower surface
Side is bigger with the contact pressure of needle-valve body upper surface unit area, and the contact pressure at non-key position is transferred to crucial portion
Position, good sealing effect.
3rd, this utility model provides the diesel common rail system oil-fuel injector needle-valve big end face of cylinder and needle-valve body upper cavity inwall
Between sealing cooperation it is ensured that high-pressure oil passage is during fuel feeding, fuel oil will not be by the needle-valve big end face of cylinder and needle-valve body
Gap between cavity inner wall is overflowed it is ensured that fuel injector internal pressure, makes diesel engine performance more stable.
Brief description
Fig. 1 is this utility model lower end A-A to sectional view；
Fig. 2 is this utility model oil injector body lower surface upward view；
Fig. 3 is this utility model needle-valve body upper surface top view.
In figure：1st, oil injector body, 2, needle-valve body, 3, control piston, 4, fuel injector cavity, 5, spring, 6, spring base, 61,
Groove I, 62, spring base cavity, 7, pressure spring chamber, 8, high-pressure oil duct, 9, stepped hole, 10, alignment pin, 11, sealing surface, 12,
Tight cap, 13, needle-valve body, 14, needle-valve cavity, 141, needle-valve body upper cavity, 142, needle-valve body lower chamber, 143, groove II, 15, rank
Ladder I, 16, ladder II, 17, pin-and-hole I, 18, pin-and-hole II, 19, nozzle, 20, counterbore.
Specific embodiment
According to Fig. 1 to Fig. 3, a kind of diesel common rail system fuel injector, including oil injector body 1, needle-valve body 2 and tight cap
12, it is provided with cavity in described tight cap 12, described oil injector body 1 and needle-valve body 2 are located in tight cap 12 cavity, described tight cap 12 upper end
It is provided with female thread, described oil injector body 1 lower end position corresponding with tight cap 12 upper end female thread is provided with external screw thread, described fuel injector
It is connected by screw thread between body 1 and tight cap 12, described tight cap 12 cavity inner wall lower end is provided with ladder II 16, described needle-valve body
2 centre position external cylindrical surfaces are provided with ladder I 15, and described ladder I 15 lower surface is contacted with the cooperation of ladder II 16 upper surface, described
II 16 pairs of needle-valve bodies 2 of ladder play axially position effect, and described oil injector body 1 lower surface is provided with the pin-and-hole I of symmetrical distribution
17, described needle-valve body 2 upper surface is respectively equipped with pin-and-hole II 18, described spray with the corresponding position of oil injector body 1 lower surface pin-and-hole I 17
It is provided with alignment pin 10, described alignment pin 10 plays radial positioning effect between oily body 1 and needle-valve body 2.
Described oil injector body 1 lower surface centre position is provided with stepped hole 9, the fan of the symmetrical distribution of described stepped hole 9
Shape, described oil injector body 1 lower surface stepped hole 9 outside is contacted with needle-valve body 2 upper surface, and described stepped hole 9 reduces oil injector body 1
And, so that the area of contact surface between oil injector body 1 and described needle-valve body 2 is little, contact point is more for the contact area of needle-valve body 2
Concentrate, reduce the leakage of fuel oil.In described oil injector body 1, axial location is provided with fuel injector cavity 4, in described fuel injector cavity 4
Lower end is provided with spring base 6, and described spring base 6 lower surface is provided with groove I 61, described spring base 6 external cylindrical surface and fuel injector cavity 4
It is provided with pressure spring chamber 7 between inwall, be provided with spring base cavity 62 in described spring base 6, be provided with described spring base cavity 62
Control piston 3, coordinate between the described control piston 3 lower end face of cylinder and spring base cavity 62 inwall and contact, described control piston 3
Lower surface is parallel with spring base 6 lower end groove I, 61 bottom surface, is provided with spring 5 above described fuel injector cavity 4 inner spring seat 6,
Described spring 5 is enclosed within control piston 3, described spring 5 with control piston 3 face of cylinder to coordinate to contact, described spring 5 lower end and bullet
Spring abutment 6 upper surface contacts, and is provided with high-pressure oil duct 8, described high-pressure oil duct 8 and fuel injector cavity 4 not phase in described oil injector body 1
Logical.
The face that described needle-valve body 2 upper end is contacted with oil injector body 1 is in concave shaped, described needle-valve body 2 upper end and fuel injector
The face that body 1 contacts near axis with respect to indent at away from axis, make needle-valve body 2 upper surface and oil injector body 1 lower surface it
Between form sealing surface 11, described sealing surface 11 prevents the fuel oil in high-pressure oil duct 8 from entering in pressure spring chamber 7, will be non-key
The contact pressure at position transfers to key position, can dramatically increase the contact pressure of high-pressure oil duct 8 and outer edge, improves close
Feng Xing.Described needle-valve body 2 upper surface centre position is provided with counterbore 20, and described counterbore 20 decreases axis position in described needle-valve body 2
Install needle-valve body cavity 14, described needle-valve body cavity 14 inwall centre position is provided with groove II 143, described groove 143 is by pin
Valve body cavity 14 is divided into needle-valve body upper cavity 141 and needle-valve body lower chamber 142, and described needle-valve body upper body cavity 141 is located at groove
Above in the of II 143, described needle-valve body lower chamber 142 is located at below groove II 143, and described needle-valve body lower chamber 142 lower end inner wall sets
There is taper surface, described needle-valve body lower chamber 142 lower end taper surface is provided with nozzle 19, the radially even distribution of described nozzle 19
On taper surface, in described needle-valve body 14 cavity, it is provided with needle-valve 13, described needle-valve 13 is multidiameter, the ladder on described needle-valve 13
In groove 143, described needle-valve 13 top is big end, and described needle-valve 13 bottom is small end, and described needle-valve 13 holds greatly the face of cylinder
Sealing cooperation and needle-valve body upper cavity 141 inwall between, described needle-valve 13 holds greatly upper surface to be deep in groove I 61, described pin
Valve 13 upper surface contacts with controlling piston 3 lower surface, the described effect controlling piston 3 that needle-valve 13 is played with axial limiting, by control
Piston 3 processed rise or fall to control rising or falling of needle-valve 13, thus controlling the keying of fuel injector, described needle-valve 13
It is provided with gap, described needle-valve 13 small end lower surface and needle-valve body cavity of resorption between the small end face of cylinder and needle-valve body lower chamber 142 inwall
The corresponding position of body 142 lower end taper surface is provided with conical protrusions, described conical protrusions taper seat and needle-valve body lower chamber 142
Lower end taper surface cooperation contact, the segment axis that described high-pressure oil duct 8 is located in needle-valve body 2 and needle-valve body 2 axes intersect, described
High-pressure oil duct 8 lower end is communicated with groove 143.Fuel oil in described high-pressure oil duct 8 initially enters groove 143, little by needle-valve 13
Eject through nozzle 19 behind gap between the end face of cylinder and needle-valve body lower chamber 142 inwall.
Although the above-mentioned accompanying drawing that combines is described to specific embodiment of the present utility model, not new to this practicality
The restriction of type protection domain, on the basis of technical solutions of the utility model, those skilled in the art do not need to pay creativeness
Various modifications that work can be made or deformation are still within protection domain of the present utility model.
Claims (7)
1. a kind of diesel common rail system fuel injector, including oil injector body, needle-valve body and tight cap, is characterized in that, during described tight cap is
Empty cavity body structure, described oil injector body and needle-valve body are located in tight cap cavity, and described oil injector body lower end is with tight cap upper end even
Connect, described needle-valve body lower end is fixed in the axial direction with tight cap upper end, described oil injector body lower end is with needle-valve body upper end diametrically
Fixing, on described oil injector body lower surface, centre position is provided with stepped hole, and in described oil injector body, axial location is provided with fuel injector
Cavity, in described fuel injector cavity, lower end is provided with spring base, and described spring base lower surface is provided with groove I, and described spring base is cylindrical
It is provided with pressure spring chamber between cylinder and fuel injector cavity inner wall, in described spring base, be provided with spring base cavity, described spring base
Be provided with control piston in cavity, above described fuel injector cavity inner spring seat, be provided with spring, described spring housing control piston on,
Described lower spring end is contacted with spring base upper surface, is provided with high-pressure oil duct in described oil injector body, described needle-valve body upper end and spray
The face that oily body contacts is in concave shaped, and in described needle-valve body, axial location is provided with needle-valve body cavity, in described needle-valve body cavity
Wall centre position is provided with groove II, and needle-valve body cavity is divided into needle-valve body upper cavity and needle-valve body lower chamber, institute by described groove II
State needle-valve body lower chamber lower end inner wall and be set to taper surface, described needle-valve body cavity lower end taper surface is diametrically provided with nozzle, institute
State in needle-valve body cavity and be provided with needle-valve；The segment axis that described high-pressure oil duct is located in needle-valve body and needle-valve body axes intersect, institute
State high-pressure oil duct lower end to communicate with groove II.
2. diesel common rail system fuel injector according to claim 1, is characterized in that, described tight cap upper end is provided with female thread,
Described oil injector body lower end position corresponding with tight cap upper end female thread is provided with external screw thread, on described oil injector body lower end and tight cap
It is connected by screw thread between end.
3. diesel common rail system fuel injector according to claim 1, is characterized in that, described tight cap cavity inner wall lower end is provided with
Ladder II, described needle-valve body centre position external cylindrical surface is provided with ladder I, and described ladder I lower surface and ladder II upper surface are joined
Splice grafting touches.
4. diesel common rail system fuel injector according to claim 1, is characterized in that, described oil injector body lower surface is provided with a left side
Right symmetrical pin-and-hole I, described needle-valve body upper surface is respectively equipped with pin-and-hole with the corresponding position of oil injector body lower surface pin-and-hole I
II, it is provided with alignment pin between described pin-and-hole I and pin-and-hole II.
5. diesel common rail system fuel injector according to claim 1, is characterized in that, it is fan-shaped that described stepped hole is shaped as left and right
Symmetrical, contact with needle-valve body upper surface outside the stepped hole of described oil injector body lower surface.
6. diesel common rail system fuel injector according to claim 1, is characterized in that, described needle-valve body upper end and oil injector body
The face contacting is near axis with respect to indent at away from axis.
7. diesel common rail system fuel injector according to claim 1, is characterized in that, described needle-valve is multidiameter, described pin
Valve top is big end, and described needle-valve bottom is small end, seals between the described needle-valve big end face of cylinder and needle-valve body upper cavity inwall
Cooperation, is provided with gap between the described needle-valve small end face of cylinder and needle-valve body lower chamber inwall, described needle-valve small end lower surface and pin
Taper surface corresponding position in valve body lower chamber lower end is provided with conical protrusions, described valve small end lower end conical protrusions taper seat with
The taper surface cooperation contact of needle-valve body lower chamber lower end.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201620957271.0U CN205955884U (en) | 2016-08-26 | 2016-08-26 | Diesel oil is rail system sprayer altogether |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201620957271.0U CN205955884U (en) | 2016-08-26 | 2016-08-26 | Diesel oil is rail system sprayer altogether |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN205955884U true CN205955884U (en) | 2017-02-15 |
Family
ID=57980917
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201620957271.0U Expired - Fee Related CN205955884U (en) | 2016-08-26 | 2016-08-26 | Diesel oil is rail system sprayer altogether |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN205955884U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109404192A (en) * | 2019-01-08 | 2019-03-01 | 北油电控燃油喷射系统(天津)有限公司 | A kind of electronic fuel injection and the fuel injector including it |
| CN113374607A (en) * | 2021-06-03 | 2021-09-10 | 上海交通大学 | Swirl oil sprayer suitable for high injection pressure |
-
2016
- 2016-08-26 CN CN201620957271.0U patent/CN205955884U/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109404192A (en) * | 2019-01-08 | 2019-03-01 | 北油电控燃油喷射系统(天津)有限公司 | A kind of electronic fuel injection and the fuel injector including it |
| CN113374607A (en) * | 2021-06-03 | 2021-09-10 | 上海交通大学 | Swirl oil sprayer suitable for high injection pressure |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| TR01 | Transfer of patent right | ||
| TR01 | Transfer of patent right |
Effective date of registration: 20181008 Address after: 265718 Shandong Longkou City high tech Industrial Park Patentee after: LONGKOU LONGBENG DIESEL OIL INJECTION HIGH-TECH Co.,Ltd. Address before: 264006 No. 1 Yanhe Road, Longkou City East Street, Yantai, Shandong Patentee before: LONGKOU LONGBENG FUEL INJECTION Co.,Ltd. |
|
| CF01 | Termination of patent right due to non-payment of annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20170215 |