CN201443451U - Common-rail pressure limiting valve for common-rail fuel ejecting system of engine - Google Patents
Common-rail pressure limiting valve for common-rail fuel ejecting system of engine Download PDFInfo
- Publication number
- CN201443451U CN201443451U CN2009200306844U CN200920030684U CN201443451U CN 201443451 U CN201443451 U CN 201443451U CN 2009200306844 U CN2009200306844 U CN 2009200306844U CN 200920030684 U CN200920030684 U CN 200920030684U CN 201443451 U CN201443451 U CN 201443451U
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- valve
- spring
- steel ball
- common rail
- valve body
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Abstract
The utility model discloses a common-rail pressure limiting valve for a common-rail fuel ejecting system of an engine, comprising a valve body, a sealing body, a spring and a hollow bolt. One end of the valve body connected with a common rail is internally provided with a throttling orifice, the valve cavity of the valve body is communicated with the common rail through the throttling orifice, and the other end of the valve body is an oil return pipe connecting end communicated with the valve cavity; and the sealing body, the spring and the hollow bolt are sequentially arranged in the valve cavity, wherein the sealing body is close to the throttling orifice, the hollow bolt is connected with the valve cavity in a threaded way, and the hollow bolt is provided with a central through hole. The utility model relates to a sealing structure formed by the sealing body and the throttling orifice, wherein the spring is utilized to generate a compaction force for the sealing body, and the bolt is utilized to adjust the precompression amount of the spring so as to adjust the pretightening force of the spring and change the opening pressure of the pressure limiting valve.
Description
Technical field
The utility model relates to a kind of pressure limit valve, particularly a kind of engine common rail fuel injection system common rail pressure limiting valve.
Background technique
At present, the fuel injection system that motor uses is gradually to the common rail system transition, its market occupancy volume is increasing, because the pressure in the rail is high altogether, the part type is up to more than the 200MPa, and the fuel oil that seal up high pressure like this is very difficult, and component inevitably machining error can occur in course of working, also need a cover regulating device to regulate cracking pressure, to eliminate the influence that machining error is brought.
Summary of the invention
The technical problems to be solved in the utility model is: provide a kind of and can be total to the engine common rail fuel injection system common rail pressure limiting valve that the interior fuel pressure of rail is no more than safety range by limiting engine.
In order to solve the problems of the technologies described above, the utility model comprises valve body, seal, spring and hollow screw, valve body is used for being provided with in the end that rail together connects the valve pocket that is communicated with valve body and the throttle orifice of rail altogether, the return tube connecting end of the other end of valve body for communicating with valve pocket, seal, spring and hollow screw are successively set in the valve pocket, the contiguous throttle orifice of seal, hollow screw is threaded with valve pocket, and described hollow screw has central through bore.
For better transmitting the positional stability of spring force and maintenance seal, described seal comprises sealed steel ball and steel ball carriage, and sealed steel ball partly is in the steel ball carriage, and the steel ball bracket portion is inserted in the spring.
For easy to connect, the end that described valve body is used for rail connection together is provided with common rail installation screw thread outward, and the return tube connecting end on the valve body is provided with return tube screw thread is installed.
For the spring that can use small size and little rigidity is finished the work of sealing extremely high pressure fuel oil, and needn't use the very big spring of size and rigidity, the diameter of described throttle orifice is 0.2-0.5mm.
The beneficial effects of the utility model are: the utility model relates to and uses seal and throttle orifice to form sealing configuration, use spring to produce the impacting force of seal, use screw to adjust the pre compressed magnitude of spring, thereby adjust the pretightening force of spring, change the cracking pressure of pressure-limit valve.Main structure body is a valve body; One termination of valve body has the minor diameter throttle orifice of rail connection together, and the throttle orifice rear end is a sealed steel ball, and the steel ball rear end is steel ball carriage and spring, and spring rear end is a hollow screw, can regulate cracking pressure.Thereby reach limiting engine and be total to the purpose that the interior fuel pressure of rail is no more than safety range.
Description of drawings
Fig. 1 is a structural representation of the present utility model;
Among the figure: 1, altogether rail is installed screw thread, and 2, throttle orifice, 3, sealed steel ball, 4, the steel ball carriage, 5, spring, 6, hollow screw, 7, return tube installs screw thread, 8, valve body.
Embodiment
A kind of specific embodiment as shown in Figure 1, it comprises sealed steel ball 3, steel ball carriage 4, spring 5, hollow screw 6 and valve body 8.
One end of valve body 8 has common rail that screw thread 1 is installed outward, has in this end of valve body 8 to be communicated with the throttle orifice 2 that is total to rail and valve body 8 internal valve cavity, and the diameter of throttle orifice 2 is preferably 0.2-0.5mm, is provided with the return tube that communicates with valve pocket in the other end of valve body 8 screw thread 7 is installed.In the valve pocket that is arranged on valve body that sealed steel ball 3, steel ball carriage 4, spring 5 and hollow screw 6 are arranged in order.Sealed steel ball 3 contiguous throttle orifices 2.Hollow screw 6 is the screws that axial hole is arranged, hollow screw 6 is threaded with valve pocket, the front end of steel ball carriage 4 is spherical grooves, the rear end is a long handle, sealed steel ball 3 parts are in the spherical groove of steel ball carriage 4, the long handle of steel ball carriage 4 is inserted in the end of spring 5, and the other end of spring 5 is against on the hollow screw 6.Throttle orifice 2 is formed a sealing pair with sealed steel ball 3, and the 4 main effects of steel ball carriage are the positions of transmitting spring force and keeping sealed steel ball 3; The pre compressed magnitude of spring 5 is regulated the fuel oil leakage path the when central through bore of hollow screw 6 is pressure release by hollow screw 6.The cracking pressure that the pre compressed magnitude that uses hollow screw 6 to adjust spring 5 is regulated the pressure limit valve uses laser bonding or similar technology will adjust the fixed-site of using hollow screw after the pressure adjustment finishes, and prevents from use to occur unexpected change.
The manufacturing installation process is as follows: sealed steel ball 3, steel ball carriage 4 and spring 5 are packed in the valve pocket of processing and the valve body 8 that cleans up successively, then hollow screw 6 is threaded into the precalculated position, then this common rail pressure limiting valve is installed to debugging with being total on the rail, slowly pressurize with being total in the rail to debugging, if pressure during less than design pressure the common rail pressure limiting valve just opened pressure release, then need hollow screw 6 is inwardly screwed in a little, the pressure limit valve is just opened when pressure reaches design pressure; Otherwise, if pressure is not opened pressure release after reaching design pressure yet, then need hollow screw 6 is slowly outwards screwed out, just open pressure release up to this pressure limit valve under design pressure; Re-use laser bonding or similar technology after adjusting and will adjust the fixed-site of using hollow screw, prevent from unexpected change in transportation and using process, to occur, or artificial adjustment.Processing difficulties must adopt steel ball with high precision and precision grinding processing at the sealing surface of throttle orifice 2 and sealed steel ball 3, guarantees its sealability; The right side of valve body 8 is sealing surfaces of engaging of rail together, also must adopt high-precision grinding processing, to guarantee its high pressure sealing performance; Remaining thread seal face is the sealing surface of low pressure oil circuit, and it is not very high requiring, and difficulty of processing is little.
Common rail pressure limiting valve working procedure is as follows:
The fuel pressure that sealed steel ball 3 right sides are suffered
F
R＝P*3.14*R
2，
Wherein P is for being total to the pressure in the rail, and R is the throttle orifice radius;
Sealed steel ball 3 left side pressures are the elastic force of spring
F
L＝K*S，
Wherein K is the elasticity coefficient of spring, and S is the pre compressed magnitude of spring.
When the pressure in the rail altogether during less than the cracking pressure of pressure limit valve, the fuel pressure that acts on sealed steel ball 3 right sides is less than the spring force that acts on sealed steel ball 3 left sides, and sealed steel ball 3 positions can not change, and the pressure in the rail is kept altogether; When because failure and other reasons when causing pressure in the common rail greater than the cracking pressure of pressure limit valve, the fuel pressure that acts on sealed steel ball 3 right sides is greater than the spring force that acts on sealed steel ball 3 left sides, sealed steel ball 3 is moved to the left, high pressure fuel in the rail is by throttle orifice 2 altogether, space around the sealed steel ball 3, the space around the steel ball carriage 4 and the center hole of hollow screw 6 flow out, pressure in the rail descends rapidly altogether, guarantee that pressure can not exceed safety range, after pressure is reduced to below the safety pressure, sealed steel ball 3 is return under the effect of spring force, again with throttle orifice 2 sealings, rail pressure will keep or rise again, and repeats above process.
Claims (4)
1. engine common rail fuel injection system common rail pressure limiting valve, it is characterized in that: comprise valve body (8), seal, spring (5) and hollow screw (6), valve body (8) is used for being provided with in the end that rail together connects the valve pocket that is communicated with valve body (8) and the throttle orifice (2) of rail altogether, the return tube connecting end of the other end of valve body (8) for communicating with valve pocket, seal, spring (5) and hollow screw (6) are successively set in the valve pocket, the contiguous throttle orifice (2) of seal, hollow screw (6) is threaded with valve pocket, and described hollow screw (6) has central through bore.
2. engine common rail fuel injection system common rail pressure limiting valve according to claim 1, it is characterized in that: described seal comprises sealed steel ball (3) and steel ball carriage (4), sealed steel ball (3) part is in the steel ball carriage (4), and steel ball carriage (4) part is inserted in the spring (5).
3. engine common rail fuel injection system common rail pressure limiting valve according to claim 2, it is characterized in that: the end that described valve body (8) is used for rail connection together is provided with common rail installation screw thread (1) outward, and the return tube connecting end on the valve body (8) is provided with return tube screw thread (7) is installed.
4. according to claim 1 or 2 or 3 described engine common rail fuel injection system common rail pressure limiting valves, it is characterized in that: the diameter of described throttle orifice (2) is 0.2-0.5mm.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2009200306844U CN201443451U (en) | 2009-07-29 | 2009-07-29 | Common-rail pressure limiting valve for common-rail fuel ejecting system of engine |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2009200306844U CN201443451U (en) | 2009-07-29 | 2009-07-29 | Common-rail pressure limiting valve for common-rail fuel ejecting system of engine |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN201443451U true CN201443451U (en) | 2010-04-28 |
Family
ID=42548128
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2009200306844U Expired - Lifetime CN201443451U (en) | 2009-07-29 | 2009-07-29 | Common-rail pressure limiting valve for common-rail fuel ejecting system of engine |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN201443451U (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104141812A (en) * | 2013-05-06 | 2014-11-12 | 北京亚新科天纬油泵油嘴股份有限公司 | Common-rail fuel pressure limiting valve |
| CN106121890A (en) * | 2016-07-26 | 2016-11-16 | 北京理工大学 | A kind of rail pressure for common rail system regulates valve |
| CN109404191A (en) * | 2018-11-26 | 2019-03-01 | 潍柴动力股份有限公司 | It is capable of the oil common rail system of quick pressure releasing and the pressure releasing method of oil common rail system |
| GB2571284A (en) * | 2018-02-22 | 2019-08-28 | Delphi Tech Ip Ltd | Pressure limiting valve |
-
2009
- 2009-07-29 CN CN2009200306844U patent/CN201443451U/en not_active Expired - Lifetime
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104141812A (en) * | 2013-05-06 | 2014-11-12 | 北京亚新科天纬油泵油嘴股份有限公司 | Common-rail fuel pressure limiting valve |
| CN106121890A (en) * | 2016-07-26 | 2016-11-16 | 北京理工大学 | A kind of rail pressure for common rail system regulates valve |
| GB2571284A (en) * | 2018-02-22 | 2019-08-28 | Delphi Tech Ip Ltd | Pressure limiting valve |
| CN109404191A (en) * | 2018-11-26 | 2019-03-01 | 潍柴动力股份有限公司 | It is capable of the oil common rail system of quick pressure releasing and the pressure releasing method of oil common rail system |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CX01 | Expiry of patent term | ||
| CX01 | Expiry of patent term |
Granted publication date: 20100428 |