CN109441684B - Common rail pipe - Google Patents
Common rail pipe Download PDFInfo
- Publication number
- CN109441684B CN109441684B CN201811125747.4A CN201811125747A CN109441684B CN 109441684 B CN109441684 B CN 109441684B CN 201811125747 A CN201811125747 A CN 201811125747A CN 109441684 B CN109441684 B CN 109441684B
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- Prior art keywords
- oil
- oil inlet
- section
- oil outlet
- circular platform
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- 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
- F02M55/00—Fuel-injection apparatus characterised by their fuel conduits or their venting means; Arrangements of conduits between fuel tank and pump F02M37/00
- F02M55/02—Conduits between injection pumps and injectors, e.g. conduits between pump and common-rail or conduits between common-rail and injectors
- F02M55/025—Common rails
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- 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
- F02M63/00—Other fuel-injection apparatus having pertinent characteristics not provided for in groups F02M39/00 - F02M57/00 or F02M67/00; Details, component parts, or accessories of fuel-injection apparatus, not provided for in, or of interest apart from, the apparatus of groups F02M39/00 - F02M61/00 or F02M67/00; Combination of fuel pump with other devices, e.g. lubricating oil pump
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- 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
- F02M2200/00—Details of fuel-injection apparatus, not otherwise provided for
- F02M2200/27—Fuel-injection apparatus with filters
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- 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
- F02M2200/00—Details of fuel-injection apparatus, not otherwise provided for
- F02M2200/31—Fuel-injection apparatus having hydraulic pressure fluctuations damping elements
- F02M2200/315—Fuel-injection apparatus having hydraulic pressure fluctuations damping elements for damping fuel pressure fluctuations
Abstract
The invention discloses a common rail pipe.A throttling filter is arranged in an oil port inner hole of an oil inlet or/and an oil outlet of the common rail pipe, the throttling filter comprises an oil inlet end cylindrical section, an oil inlet end circular platform section, an oil outlet end circular platform section and an oil outlet end cylindrical section which are sequentially arranged along the axial direction, the oil inlet end cylindrical section and the oil outlet end cylindrical section are tightly matched with the oil port inner hole, and gaps are reserved between the oil inlet end circular platform section and the oil outlet end circular platform section and the oil port inner hole; the surface of the throttling filter is provided with an oil inlet tank and an oil outlet tank which extend along the axial direction and are arranged at intervals, the oil inlet tank starts from the cylinder section at the oil inlet end and ends at the circular table section at the oil outlet end, and the oil outlet tank starts from the cylinder section at the oil outlet end and ends at the circular table section at the oil inlet end. The common rail pipe realizes the throttling function and the filtering function of high-pressure fuel oil, effectively reduces the jamming failure rate of the oil injector caused by particulate impurities, and makes a prominent contribution to the normal operation of an engine.
Description
Technical Field
The invention relates to the technical field of engine parts, in particular to a common rail pipe.
Background
The high-pressure common rail electric injection technology refers to an oil supply mode which completely separates the generation of injection pressure and the injection process from each other in a closed loop system consisting of a high-pressure oil pump, a pressure sensor and an Electronic Control Unit (ECU). The high-pressure common rail system comprises a high-pressure oil pump, a common rail pipe, a high-pressure oil pipe, an oil injector, an electric control unit, various sensors, an actuator and the like. The fuel oil is pumped into an oil inlet of the high-pressure oil pump by the fuel supply pump from the oil tank, the high-pressure oil pump driven by the engine boosts the fuel oil and then sends the fuel oil into the common rail pipe cavity, and then the electromagnetic valve controls each cylinder oil sprayer to spray oil at corresponding time.
The common rail pipe is used for storing high-pressure fuel oil, and pressure fluctuation generated by oil supply and oil injection of the high-pressure pump is buffered by the volume of the common rail pipe. When a large amount of fuel is output, the common rail pressure common to all cylinders is kept constant, thereby ensuring that the injection pressure is constant when the injector is opened.
As shown in fig. 1, in the conventional common rail pipe, a throttle valve 20 is installed in an oil port inner hole 101 of an oil inlet/outlet 10 of the common rail pipe, for reducing pressure fluctuation of the oil inlet or the oil outlet. As shown in fig. 2, a variable cross-section internal flow passage that penetrates in the axial direction is provided inside the valve body of the throttle valve 20, and the variable cross-section internal flow passage includes a large-diameter section flow passage 201 and a small-diameter section flow passage 202.
The throttle valve 20 with the structure only has a single throttling function and does not have the function of filtering fuel oil, and if large-particle impurities exist in the fuel oil, the jamming fault of a flow passage or/and an oil sprayer inside the throttle valve is easily caused, so that the normal operation of an engine is influenced.
Disclosure of Invention
In view of the above, the technical problems to be solved by the present invention are: the utility model provides a common rail pipe with throttle and filter function reduces the pressure oscillation, prevents that large granule impurity from getting into, reduces the jamming trouble, does benefit to engine normal operating.
In order to solve the technical problems, the technical scheme of the invention is as follows: common rail pipe, common rail pipe includes common rail pipe body, be provided with oil inlet and oil-out on the common rail pipe body, the oil inlet or/and the hydraulic fluid port hole of oil-out is provided with the throttle filter, the throttle filter includes:
the oil inlet end circular platform section, the oil outlet end circular platform section and the oil outlet end cylindrical section are sequentially arranged along the axial direction, the large diameter end of the oil inlet end circular platform section is connected with the oil inlet end cylindrical section, the small diameter end of the oil inlet end circular platform section is connected with the small diameter end of the oil outlet end circular platform section, the large diameter end of the oil outlet end circular platform section is connected with the oil outlet end cylindrical section, the oil inlet end cylindrical section and the oil outlet end cylindrical section are tightly matched with the oil port inner hole, and gaps are reserved between the oil inlet end circular platform section and the oil outlet end circular platform section and the oil port inner hole;
the surface of the throttling filter is provided with an oil groove extending along the axial direction, and the oil groove comprises an oil inlet groove and an oil outlet groove.
The following are further improvements to the common rail pipe of the present invention:
the oil inlet groove starts from the oil inlet end cylindrical section, penetrates through the oil inlet end cylindrical section and the oil inlet end circular platform section, and ends at the oil outlet end circular platform section; the oil outlet groove starts from the oil outlet end cylindrical section, penetrates through the oil outlet end cylindrical section and the oil outlet end circular platform section, and ends at the oil inlet end circular platform section.
The side surface of the oil inlet end circular platform section and the side surface of the oil outlet end circular platform section are both inwards concave cambered surfaces.
And in the direction extending from one end of the throttling filter to the other end, the circumferential size of the oil groove shrinks to be smaller.
Wherein, further, the tail end of oil groove is triangle-shaped.
Wherein the cross section of the oil groove is V-shaped.
Wherein, the oil groove is along circumference equipartition.
Wherein, the oil inlet tank, the oil outlet tank is provided with two to four respectively.
Wherein, the oil inlet groove with the oil outlet groove interval sets up.
Wherein, the oil inlet is provided with one or two, the oil-out is provided with a plurality ofly.
After the technical scheme is adopted, the invention has the following beneficial effects:
according to the common rail pipe, the throttling filter is arranged in the oil port inner hole of the oil inlet or/and the oil outlet on the common rail pipe body, the throttling filter comprises an oil inlet end cylindrical section, an oil inlet end circular platform section, an oil outlet end circular platform section and an oil outlet end cylindrical section which are sequentially arranged along the axial direction, and an oil inlet groove and an oil outlet groove which extend along the axial direction are formed in the surface of the throttling filter; the cross-sectional area of the middle part of the throttling filter is smaller, and a gap exists between the throttling filter and an inner hole of an oil port, so that the oil circuit intercommunication between an oil inlet tank and an oil outlet tank is realized; because the clearance between the surface of the throttling filter and the inner hole of the oil port is much smaller than the internal flow passage of the circular cross section of the existing throttling valve, large-particle impurities can be prevented from entering the throttling filter, the high-pressure oil pipe and the oil injector, the impurity filtering function is realized, the clamping stagnation fault is reduced, and the normal operation of an engine is facilitated; in addition, under the impact of high-pressure fuel, even if slightly bigger particle impurities enter the throttling filter, the tail end of the oil groove directly collides with the large particle impurities, so that the large particle impurities can be broken, the function of breaking the particle impurities is realized, and the large particle impurities are prevented from entering a high-pressure oil pipe and an oil sprayer.
In summary, in the common rail pipe, the throttle filter which is completely different from the original throttle valve in structure and principle is arranged in the oil port inner hole of the oil inlet or/and the oil outlet on the common rail pipe body, and the throttle filter is matched with the oil port inner hole, so that the throttle function and the filtering function of high-pressure fuel oil are realized, the clamping failure rate of the oil injector caused by particulate impurities is effectively reduced, and the common rail pipe makes outstanding contribution to the normal operation of an engine.
Drawings
FIG. 1 is a schematic cross-sectional view of a prior art common rail pipe with a throttle valve mounted in an oil inlet and outlet bore;
FIG. 2 is a schematic cross-sectional view of the throttle valve of FIG. 1;
FIG. 3 is a schematic cross-sectional view of the common rail of the present invention at the outlet port (throttle filter not shown);
FIG. 4 is a schematic perspective view of FIG. 3;
FIG. 5 is a front view of the throttle filter of FIG. 3;
FIG. 6 is a left side view of FIG. 5;
FIG. 7 is a top view of FIG. 5;
FIG. 8 is a perspective view of FIG. 5;
in the figure: 1-an oil outlet; 11-oil port inner hole; 2-a throttle filter; 21-oil inlet end cylindrical section; 22-oil inlet end circular table section; 23-oil outlet end circular platform section; 24-oil outlet end cylindrical section; 25-oil inlet tank; 26-an oil outlet groove; a-a gap;
10-oil inlet and outlet; 101-an oil port inner hole; 20-a throttle valve; 201-large diameter section flow channel; 202-minor diameter section flow channel;
in the figure, the dashed arrows indicate the fuel direction.
Detailed Description
The invention is further illustrated in the following non-restrictive manner with reference to the figures and examples.
The common rail pipe comprises a common rail pipe body (the common rail pipe body is known in the art and is not specifically shown in the figure), an oil inlet and an oil outlet are arranged on the common rail pipe body, and the oil inlet and the oil outlet are both provided with oil port inner holes; a throttling filter is arranged in an oil port inner hole of the oil inlet; or a throttling filter is arranged in an oil port inner hole of the oil outlet; or throttling filters are arranged in the oil port inner hole of the oil inlet and the oil port inner hole of the oil outlet.
As shown in fig. 3 and 4 together, a throttle filter 2 is disposed in a port inner hole 11 of the oil outlet 1, which is a schematic structural sectional view of the oil outlet. The structure and principle of the oil inlet and the oil outlet are the same, and the detailed illustration is omitted.
As shown in fig. 5 to 8, the throttle filter 2 includes an oil inlet end cylindrical section 21, an oil inlet end circular platform section 22, an oil outlet end circular platform section 23 and an oil outlet end cylindrical section 24, which are arranged in sequence along the axial direction; wherein, the big diameter end of the oil inlet end circular platform section 22 is connected with the oil inlet end cylindrical section 21, the small diameter end of the oil inlet end circular platform section 22 is connected with the small diameter end of the oil outlet end circular platform section 23, and the big diameter end of the oil outlet end circular platform section 23 is connected with the oil outlet end cylindrical section 24. As shown in fig. 3, the oil inlet end cylindrical section 21 and the oil outlet end cylindrical section 24 are tightly fitted, preferably in an interference fit, with the oil port inner hole 11; gaps A are reserved between the oil inlet end circular platform section 22, the oil outlet end circular platform section 23 and the oil port inner hole 11. Wherein, the surface of the throttling filter 2 is provided with oil grooves extending along the axial direction, the oil grooves comprise oil inlet grooves 25 and oil outlet grooves 26 arranged at intervals, and the oil grooves are optimally designed to be uniformly distributed along the circumferential direction; the oil inlet groove 25 starts from the oil inlet end cylindrical section 21, penetrates through the oil inlet end cylindrical section 21 and the oil inlet end circular platform section 22, and ends at the oil outlet end circular platform section 23; the oil outlet groove 26 starts from the oil outlet end cylindrical section 24, and penetrates through the oil outlet end cylindrical section 24 and the oil outlet end circular platform section 23, and ends at the oil inlet end circular platform section 22.
As shown in fig. 3, 5, 6 and 8, the side surface of the oil inlet end circular platform section 22 and the side surface of the oil outlet end circular platform section 23 are both optimally designed to be concave cambered surfaces (i.e., the generatrix forming the circular platform is a concave arc line, which is not a straight line). The cambered surface shape can reduce the resistance of oil flow, so that fuel oil flows smoothly, and the strength of the throttle filter 2 can be improved to a certain extent.
As shown in fig. 5, fig. 6 and fig. 8, in the direction extending from one end of the throttle filter 2 to the other end, the circumferential dimensions of the oil inlet groove 25 and the oil outlet groove 26 are reduced, that is, the cross-sectional area of the oil groove is changed, so that the throttle function is achieved, and large particle impurities are blocked from flowing forward. Oil feed tank 25 and the tail end of oil groove 26 all are triangle-shaped, even have the granule impurity entering a little bit more, the tail end and the granule impurity direct collision of oil groove can broken large granule impurity, avoid large granule impurity to get into high pressure fuel pipe, sprayer.
As shown in fig. 7, the oil inlet groove 25 and the oil outlet groove 26 are V-shaped in cross section. The size of the V-shaped included angle is related to the flow requirement, and the V-shaped included angle can be specifically designed according to the flow requirement.
As shown in fig. 5 to 8, three oil inlet tanks 25 and three oil outlet tanks 26 are illustrated, and obviously, the number of the oil tanks is not limited herein, and may be increased or decreased according to actual requirements, for example, two or four oil inlet tanks 25 and four oil outlet tanks 26 are respectively illustrated. The number of the oil grooves is large, so that the throttling and filtering capabilities of the throttling filter 2 can be improved, but the strength of the throttling filter 2 can be reduced; the oil grooves are small in number, the strength of the throttle filter 2 can be guaranteed, and the throttling and filtering capabilities of the throttle filter 2 can be reduced.
Wherein, the oil inlet on the common rail pipe body is provided with one, or two. The common rail pipe body is provided with a plurality of oil outlets, and the number of the oil outlets is consistent with the number of engine oil injectors and cylinders, such as four, six, eight or more.
The common rail pipe of the invention has the following throttling and filtering principles:
referring to fig. 3, when an engine using the common rail pipe of the present invention operates, when high-pressure fuel oil is supplied from an oil outlet 1 to an oil injector through a high-pressure oil pipe, the high-pressure fuel oil enters a throttle filter 2 from an oil inlet tank 25, because the middle cross-sectional area of the throttle filter 2 is small, a gap a exists between the throttle filter 2 and an oil port inner hole 11, the oil circuit intercommunication between the oil inlet tank 25 and an oil outlet tank 26 is realized, the high-pressure fuel oil enters the oil outlet tank 26 through the gap a near the middle of the throttle filter 2, and enters the downstream high-pressure oil pipe and the oil injector from the oil outlet tank 26, so as to reduce the flow area, control the pressure; the clearance A between the surface of the throttle filter 2 and the oil port inner hole 11 is much smaller than the internal flow passage of the circular cross section of the existing throttle valve 20, and under the condition of the same flow cross section area, the cross section area of each oil groove on the surface of the throttle filter 2 is only a fraction of the internal flow passage of the original throttle valve 20 (the number of the oil inlet grooves 25 or the oil outlet grooves 26 is used as a denominator), so that large-particle impurities can be prevented from entering the throttle filter 2, the high-pressure oil pipe and the oil injector, the impurity filtering function is realized, the clamping stagnation fault is reduced, and the normal operation of an engine is facilitated; in addition, under the high-pressure fuel impact, even if particle impurities slightly larger enter the throttling filter 2, the tail end of the oil groove directly collides with the large particle impurities, the large particle impurities can be broken, the particle impurity breaking function is realized, and the large particle impurities are prevented from entering the high-pressure oil pipe and the oil sprayer.
In summary, in the common rail pipe, the throttle filter which is completely different from the original throttle valve in structure and principle is arranged in the oil port inner hole of the oil inlet or/and the oil outlet on the common rail pipe body, and the throttle filter is matched with the oil port inner hole, so that the throttle function and the filtering function of high-pressure fuel oil are realized, the clamping failure rate of the oil injector caused by particulate impurities is effectively reduced, and the common rail pipe makes outstanding contribution to the normal operation of an engine.
Claims (8)
1. Common rail pipe, common rail pipe includes common rail pipe body, be provided with oil inlet and oil-out on the common rail pipe body, its characterized in that, the oil inlet or/and the hydraulic fluid port hole of oil-out is provided with the throttle filter, the throttle filter includes:
the oil inlet end circular platform section, the oil outlet end circular platform section and the oil outlet end cylindrical section are sequentially arranged along the axial direction, the large diameter end of the oil inlet end circular platform section is connected with the oil inlet end cylindrical section, the small diameter end of the oil inlet end circular platform section is connected with the small diameter end of the oil outlet end circular platform section, the large diameter end of the oil outlet end circular platform section is connected with the oil outlet end cylindrical section, the oil inlet end cylindrical section and the oil outlet end cylindrical section are tightly matched with the oil port inner hole, and gaps are reserved between the oil inlet end circular platform section and the oil outlet end circular platform section and the oil port inner hole; the side surface of the oil inlet end circular platform section and the side surface of the oil outlet end circular platform section are both inwards concave cambered surfaces;
the surface of the throttling filter is provided with an oil groove extending along the axial direction, and the oil groove comprises an oil inlet groove and an oil outlet groove; and in the direction extending from one end of the throttling filter to the other end, the circumferential size of the oil groove shrinks to be smaller.
2. The common rail pipe according to claim 1, wherein said oil inlet groove starts at said oil inlet end cylindrical section, runs through said oil inlet end cylindrical section, said oil inlet end circular platform section, and ends at said oil outlet end circular platform section; the oil outlet groove starts from the oil outlet end cylindrical section, penetrates through the oil outlet end cylindrical section and the oil outlet end circular platform section, and ends at the oil inlet end circular platform section.
3. The common rail pipe of claim 1, wherein the trailing end of the oil groove is triangular.
4. The common rail of claim 1, wherein said oil groove is V-shaped in cross-section.
5. The common rail pipe of claim 1, wherein said oil grooves are circumferentially equispaced.
6. The common rail pipe of claim 1, wherein said oil inlet groove is spaced from said oil outlet groove.
7. The common rail pipe according to claim 1, wherein two to four oil feed grooves and four oil discharge grooves are provided, respectively.
8. The common rail pipe according to claim 1, wherein said oil inlet is provided with one or two, and said oil outlet is provided with a plurality of.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811125747.4A CN109441684B (en) | 2018-09-26 | 2018-09-26 | Common rail pipe |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811125747.4A CN109441684B (en) | 2018-09-26 | 2018-09-26 | Common rail pipe |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN109441684A CN109441684A (en) | 2019-03-08 |
| CN109441684B true CN109441684B (en) | 2020-06-02 |
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ID=65544459
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201811125747.4A Active CN109441684B (en) | 2018-09-26 | 2018-09-26 | Common rail pipe |
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| Country | Link |
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| CN (1) | CN109441684B (en) |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102062010A (en) * | 2011-01-21 | 2011-05-18 | 上海交通大学 | High-pressure common rail segmental injection pressure control system of diesel engine |
| CN203614299U (en) * | 2013-12-03 | 2014-05-28 | 潍柴动力股份有限公司 | Common rail diesel engine high pressure oil pipe assembly |
Family Cites Families (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2001304067A (en) * | 2000-04-20 | 2001-10-31 | Bosch Automotive Systems Corp | High pressure fuel supply pump |
| CN201050432Y (en) * | 2007-04-05 | 2008-04-23 | 王保金 | Diesel engine oil injector assembly oil inlet hole high pressure oil filtering device |
| JP2015086812A (en) * | 2013-10-31 | 2015-05-07 | いすゞ自動車株式会社 | Failure diagnosis system of common rail system, and failure diagnosis method therein |
-
2018
- 2018-09-26 CN CN201811125747.4A patent/CN109441684B/en active Active
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102062010A (en) * | 2011-01-21 | 2011-05-18 | 上海交通大学 | High-pressure common rail segmental injection pressure control system of diesel engine |
| CN203614299U (en) * | 2013-12-03 | 2014-05-28 | 潍柴动力股份有限公司 | Common rail diesel engine high pressure oil pipe assembly |
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| Publication number | Publication date |
|---|---|
| CN109441684A (en) | 2019-03-08 |
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