CN108412653B - Common rail fuel injector - Google Patents
Common rail fuel injector Download PDFInfo
- Publication number
- CN108412653B CN108412653B CN201810278844.0A CN201810278844A CN108412653B CN 108412653 B CN108412653 B CN 108412653B CN 201810278844 A CN201810278844 A CN 201810278844A CN 108412653 B CN108412653 B CN 108412653B
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- Prior art keywords
- oil
- valve
- hole
- oil outlet
- cavity
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- 239000000446 fuel Substances 0.000 title abstract description 10
- 238000000034 method Methods 0.000 claims abstract 2
- 238000007789 sealing Methods 0.000 claims description 18
- 238000009434 installation Methods 0.000 claims description 15
- 238000004891 communication Methods 0.000 claims description 11
- 238000002485 combustion reaction Methods 0.000 abstract description 3
- 239000007921 spray Substances 0.000 abstract description 2
- 239000003921 oil Substances 0.000 description 179
- 239000000295 fuel oil Substances 0.000 description 9
- 238000002347 injection Methods 0.000 description 4
- 239000007924 injection Substances 0.000 description 4
- 238000010586 diagram Methods 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000002035 prolonged effect Effects 0.000 description 1
- 238000005507 spraying Methods 0.000 description 1
Classifications
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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
- F02M61/00—Fuel-injectors not provided for in groups F02M39/00 - F02M57/00 or F02M67/00
- F02M61/04—Fuel-injectors not provided for in groups F02M39/00 - F02M57/00 or F02M67/00 having valves, e.g. having a plurality of valves in series
- F02M61/10—Other injectors with elongated valve bodies, i.e. of needle-valve type
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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
- F02M63/0012—Valves
- F02M63/0014—Valves characterised by the valve actuating means
- F02M63/0015—Valves characterised by the valve actuating means electrical, e.g. using solenoid
- F02M63/0017—Valves characterised by the valve actuating means electrical, e.g. using solenoid using electromagnetic operating means
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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
- F02M63/0012—Valves
- F02M63/0014—Valves characterised by the valve actuating means
- F02M63/0028—Valves characterised by the valve actuating means hydraulic
Landscapes
- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Electromagnetism (AREA)
- Fuel-Injection Apparatus (AREA)
Abstract
The invention provides a common rail oil sprayer, which comprises an oil sprayer body, an electromagnetic valve assembly, an oil outlet metering valve, a control valve assembly and a needle valve, wherein the electromagnetic valve assembly is arranged on the oil outlet metering valve; the method is characterized in that: the control valve assembly consists of a valve sleeve, a control valve, a reset spring, a valve sleeve spring and an oil pressure plunger. By adopting the common rail fuel injector, the spray characteristic better meets the requirements of a diesel engine combustion system, the mixed gas is combusted more fully, the thermal efficiency is greatly improved, and the noise of a diesel engine is greatly reduced.
Description
Technical Field
The invention relates to the technical field of electric control oil injection, in particular to a common rail oil injector.
Background
The common rail fuel injector is a key component in a common rail system of the diesel engine, and the key technology to be solved by the common rail fuel injector is to control the fuel injection quantity accurately, so that the spray characteristic of the common rail fuel injector meets the requirements of a diesel engine combustion system, the mixed gas is combusted perfectly, higher heat efficiency is obtained, and the noise of the diesel engine is reduced.
Disclosure of Invention
Aiming at the problems of the background technology, the invention provides a common rail oil injector which solves the problems of low thermal efficiency and high noise of a diesel engine in the prior art.
In order to achieve the purpose of the invention, the invention provides a common rail oil injector, which comprises an oil injector body, an electromagnetic valve assembly, an oil outlet metering valve, a control valve assembly and a needle valve; the inner cavity of the oil sprayer body sequentially forms an electromagnetic valve mounting cavity, a metering valve mounting cavity, a control valve mounting cavity and a needle valve cavity from top to bottom; the control valve installation cavity is communicated with an oil inlet channel on the oil sprayer body, and the metering valve installation cavity is communicated with an oil outlet channel on the oil sprayer body; the electromagnetic valve assembly is arranged in the electromagnetic valve installation cavity; the oil outlet metering valve is arranged in the metering valve mounting cavity; the control valve assembly is arranged in the control valve installation cavity; the needle valve is arranged in the needle valve cavity; the innovation point is that:
the control valve assembly consists of a valve sleeve, a control valve, a reset spring, a valve sleeve spring and an oil pressure plunger;
the middle part of the inner hole of the valve sleeve is provided with a sealing conical surface, an inner hole at the upper side of the sealing conical surface forms an upper control cavity, an inner hole at the lower side of the sealing conical surface forms a lower control cavity, and the aperture of the upper control cavity is larger than that of the lower control cavity; the upper part of the valve sleeve is provided with a communication hole which communicates the upper control cavity with the outer wall of the upper part of the valve sleeve;
an oil inlet groove is formed in the upper end face of the control valve, an oil inlet connecting groove is formed in the bottom of the oil inlet groove, an auxiliary oil inlet hole is formed in the outer side of the oil inlet connecting groove, the auxiliary oil inlet hole is used for communicating the oil inlet connecting groove with the side wall of the control valve, and the aperture of the auxiliary oil inlet hole is smaller than the diameter of an oil outlet metering hole in the oil outlet metering valve; an oil outlet connecting groove is formed in the lower end face of the control valve, an auxiliary oil outlet hole is formed in the bottom of the oil outlet connecting groove, the auxiliary oil outlet hole is used for communicating the oil outlet connecting groove with the oil inlet groove, and the diameter of the auxiliary oil outlet hole is smaller than that of the oil outlet metering hole; an oil inlet hole is formed in one side of the oil outlet connecting groove in the control valve, the upper port of the oil inlet hole is positioned outside the oil inlet groove, the oil inlet hole communicates the upper end face and the lower end face of the control valve, and the diameter of the oil inlet hole is larger than that of the oil outlet metering hole; the lower end of the control valve is provided with a contact surface matched with the sealing conical surface;
the valve sleeve is arranged below the oil outlet metering valve, the upper end of the oil pressure plunger is sleeved in the lower control cavity, and the lower end of the oil pressure plunger is positioned in the needle valve cavity; the middle part of the oil pressure plunger is provided with a limiting ring, the valve sleeve spring is sleeved on the oil pressure plunger, the upper end of the valve sleeve spring is contacted with the lower end face of the valve sleeve, the lower end of the valve sleeve spring is contacted with the upper end face of the limiting ring, the valve sleeve spring is always in a compressed state, and the valve sleeve spring abuts against the lower end face of the oil outlet metering valve; when the oil pressure plunger is positioned at the position of the maximum descending stroke, the lower end surface of the oil pressure plunger is contacted with the upper end surface of the needle valve;
the control valve is arranged in the upper control cavity, and a gap is reserved between the lower end face of the control valve and the upper end face of the oil pressure plunger; the communication hole is communicated with the auxiliary oil inlet hole; the lower port of the oil inlet hole is communicated with the lower control cavity, and the upper port of the oil inlet hole is staggered with the lower port of the oil outlet metering hole; the oil outlet connecting groove is communicated with the lower control cavity; the oil inlet groove is communicated with the oil outlet metering hole, the auxiliary oil outlet hole is opposite to the oil outlet metering hole, and the oil inlet connecting groove is staggered with the lower port of the oil outlet metering hole; when the sealing conical surface is contacted with the contact surface, a gap is reserved between the upper end surface of the control valve and the lower end surface of the oil outlet metering valve;
the return spring is arranged between the control valve and the oil pressure plunger, and is always in a compressed state.
The working principle of the invention is as follows:
when the electromagnetic valve of the common rail oil injector is not electrified, an oil outlet metering hole on an oil outlet metering valve is in a closed state, at the moment, an oil pressure plunger is in a descending maximum stroke position under the combined action of high-pressure fuel oil and a reset spring to prop against a needle valve, and at the moment, a nozzle of the common rail oil injector is in a closed state;
when the electromagnetic valve is electrified, the oil outlet metering hole is opened, fuel oil in the upper control cavity leaks through the oil outlet metering hole to flow to the oil outlet channel, the oil pressure of the upper control cavity is rapidly reduced, high-pressure fuel oil in the lower control cavity flows to the upper control cavity through the auxiliary oil outlet hole, the oil pressure of the lower control cavity is reduced, the oil pressure of the upper control cavity is gradually reduced due to the fact that the diameter of the auxiliary oil outlet hole is smaller than that of the oil outlet metering hole, the oil pressure of the lower control cavity is larger than that of the upper control cavity, the control valve is rapidly pushed up by the fuel oil until the upper end face of the control valve is tightly attached to the lower end face of the oil outlet metering valve, the oil inlet hole on the control valve is closed, high-pressure fuel oil can only enter the oil inlet groove through the auxiliary oil inlet hole, the aperture of the auxiliary oil inlet hole is smaller than that of the oil outlet metering hole, the oil pressure of the oil inlet groove is still lower than that of the lower control cavity, the oil pressure of the lower control cavity can only leak the fuel oil through the auxiliary oil outlet hole at the moment, the oil pressure of the lower control cavity is slowly reduced, the pressure of the lower control cavity is slowly acted on the oil plunger needle valve is slowly reduced, and the needle valve is opened slowly;
when the electromagnetic valve is powered off, the oil outlet metering hole is closed, high-pressure fuel oil is supplemented to the upper control cavity from the oil inlet channel through the communication hole, at the moment, high-pressure fuel oil in the upper control cavity enters the oil inlet channel through the auxiliary oil inlet hole because the oil pressure of the oil inlet channel is lower than that of the upper control cavity, the oil pressure of the oil inlet channel is increased, and when the oil pressure of the oil inlet channel is higher than that of the lower control cavity, the control valve is pushed downwards until the lower end of the control valve contacts with the sealing conical surface in the valve sleeve to limit and form sealing; at the moment, the upper end face of the control valve is separated from the lower end face of the oil outlet metering valve to form a gap, the upper port of the oil inlet hole is opened, fuel oil in the upper control cavity rapidly enters the lower control cavity through the oil inlet hole, the oil pressure of the lower control cavity rapidly rises, the pressure acting on the upper end of the oil pressure plunger rapidly increases, the acting force of the return spring is added, the oil pressure plunger rapidly pushes the needle valve downwards, and the oil nozzle of the common rail oil sprayer is closed;
the common rail fuel injector realizes the circulation of smooth opening and rapid closing of the needle valve according to the mode through the circulation of on-off power of the electromagnetic valve, and can accurately control the opening and closing speed of the needle valve through the adjustment of the auxiliary oil inlet hole, the auxiliary oil outlet hole and the oil inlet hole on the control valve.
Due to the adoption of the technical scheme, the invention has the following beneficial effects: the needle valve is opened slowly and closed rapidly, so that the injection time of the common rail injector is prolonged, the closing time is shortened, the fuel injection curve of the common rail injector is more gentle, the spraying characteristic is more in accordance with the requirements of a diesel engine combustion system, the mixed gas is combusted more fully, the thermal efficiency is greatly improved, and the noise of a diesel engine is greatly reduced.
Drawings
The drawings of the present invention are described below.
FIG. 1 is a schematic diagram of the mechanism of the present invention;
FIG. 2 is an enlarged schematic view of the portion A of FIG. 1;
FIG. 3 is a schematic diagram of a control valve
Fig. 4 is a top view of fig. 3.
In the figure: 1. an oil injector body; 2. a solenoid valve assembly; 3. an oil outlet metering valve; 5. a needle valve; 3-1, an oil outlet metering hole; 4-1, valve sleeve; 4-1-1, a communication hole; 4-2, a control valve; 4-2-1, an oil inlet groove; 4-2-2, an oil inlet connecting groove; 4-2-3, auxiliary oil inlet holes; 4-2-4, an oil outlet connecting groove; 4-2-5, auxiliary oil outlet holes; 4-2-6, oil inlet hole; 4-3, a return spring; 4-4, valve sleeve springs; 4-5, oil pressure plunger.
Detailed Description
The invention is further described below with reference to the drawings and examples.
The common rail injector shown in fig. 1 to 4 comprises an injector body 1, a solenoid valve assembly 2, an oil outlet metering valve 3, a control valve assembly and a needle valve 5; the inner cavity of the oil sprayer body 1 sequentially forms an electromagnetic valve installation cavity, a metering valve installation cavity, a control valve installation cavity and a needle valve cavity from top to bottom; the control valve installation cavity is communicated with an oil inlet channel on the oil sprayer body 1, and the metering valve installation cavity is communicated with an oil outlet channel on the oil sprayer body 1; the electromagnetic valve assembly 2 is arranged in the electromagnetic valve installation cavity; the oil outlet metering valve 3 is arranged in the metering valve mounting cavity; the control valve assembly is arranged in the control valve installation cavity; the needle valve 5 is arranged in the needle valve cavity;
the control valve assembly consists of a valve sleeve 4-1, a control valve 4-2, a return spring 4-3, a valve sleeve spring 4-4 and an oil pressure plunger 4-5;
the middle part of the inner hole of the valve sleeve 4-1 is provided with a sealing conical surface, an inner hole at the upper side of the sealing conical surface forms an upper control cavity, an inner hole at the lower side of the sealing conical surface forms a lower control cavity, and the aperture of the upper control cavity is larger than that of the lower control cavity; the upper part of the valve sleeve 4-1 is provided with a communication hole 4-1-1, the communication hole 4-1-1 communicates the upper control cavity with the outer wall of the upper part of the valve sleeve 4-1, and the communication hole 4-1-1 is always communicated with the oil inlet channel;
the upper end surface of the control valve 4-2 is provided with an oil inlet groove 4-2-1, and the shape of the oil inlet groove 4-2-1 in this embodiment is shown in fig. 4, so that the area of the oil inlet groove 4-2-1 is as large as possible, and when the electromagnetic valve is closed, the control valve 4-2 obtains larger downward pressure, and can be pressed down more quickly. An oil inlet connecting groove 4-2-2 is formed in the bottom of the oil inlet groove 4-2-1, an auxiliary oil inlet hole 4-2-3 is formed in the outer side of the oil inlet connecting groove 4-2-2, the auxiliary oil inlet hole 4-2-3 is used for communicating the oil inlet connecting groove 4-2-2 with the side wall of the control valve 4-2, and the aperture of the auxiliary oil inlet hole 4-2-3 is smaller than the diameter of an oil outlet metering hole 3-1 in the oil outlet metering valve 3; an oil outlet connecting groove 4-2-4 is formed in the lower end face of the control valve 4-2, an auxiliary oil outlet 4-2-5 is formed in the bottom of the oil outlet connecting groove 4-2-4, the auxiliary oil outlet 4-2-5 is used for communicating the oil outlet connecting groove 4-2-4 with the oil inlet groove 4-2-1, and the diameter of the auxiliary oil outlet 4-2-5 is smaller than that of the oil outlet metering hole 3-1; one side of an oil outlet connecting groove 4-2-4 in the control valve 4-2 is provided with an oil inlet 4-2-6, an upper port of the oil inlet 4-2-6 is positioned outside the oil inlet groove 4-2-1, and when the upper end surface of the control valve 4-2 is in contact with the lower end surface of the oil outlet metering valve 3, the oil inlet 4-2-6 is in an off state. The oil inlet hole 4-2-6 communicates the upper end face and the lower end face of the control valve 4-2, and the diameter of the oil inlet hole 4-2-6 is larger than that of the oil outlet metering hole 3-1;
the lower end of the control valve 4-2 is provided with a contact surface matched with the sealing conical surface, and in the embodiment, the conical surface is adopted to seal between the control valve 4-2 and the valve sleeve 4-1, so that the sealing effect is better.
The valve sleeve 4-1 is arranged below the oil outlet metering valve 3, the upper end of the oil pressure plunger 4-5 is sleeved in the lower control cavity, and the lower end of the oil pressure plunger 4-5 is positioned in the needle valve cavity; the middle part of the oil pressure plunger 4-5 is provided with a limiting ring, the valve sleeve spring 4-4 is sleeved on the oil pressure plunger 4-5, the upper end of the valve sleeve spring 4-4 is contacted with the lower end face of the valve sleeve 4-1, the lower end of the valve sleeve spring 4-4 is contacted with the upper end face of the limiting ring, the valve sleeve spring 4-4 is always in a compressed state, and the valve sleeve spring 4-4 supports the valve sleeve 4-1 on the lower end face of the oil outlet metering valve 3; when the oil pressure plunger 4-5 is positioned at the position of the maximum travel of the descending, the lower end surface of the oil pressure plunger 4-5 is contacted with the upper end surface of the needle valve 5;
the control valve 4-2 is arranged in the upper control cavity, and a gap is reserved between the lower end face of the control valve 4-2 and the upper end face of the oil pressure plunger 4-5; the communication hole 4-1-1 is communicated with the auxiliary oil inlet hole 4-2-3; the lower port of the oil inlet hole 4-2-6 is communicated with the lower control cavity, and the upper port of the oil inlet hole 4-2-6 is staggered with the lower port of the oil outlet metering hole 3-1 when the upper port is staggered; the oil outlet connecting groove 4-2-4 is communicated with the lower control cavity; the oil inlet groove 4-2-1 is communicated with the oil outlet metering hole 3-1, the auxiliary oil outlet hole 4-2-5 is opposite to the oil outlet metering hole 3-1, and the oil inlet connecting groove 4-2-2 is staggered with the lower port of the oil outlet metering hole 3-1; when the sealing conical surface is contacted with the contact surface, a gap is reserved between the upper end surface of the control valve 4-2 and the lower end surface of the oil outlet metering valve 3, so that the upper port of the oil inlet 4-2-6 is communicated with the upper control cavity, and high-pressure fuel enters the lower control cavity;
the return spring 4-3 is arranged between the control valve 4-2 and the oil pressure plunger 4-5, and the return spring 4-3 is always in a compressed state.
Claims (1)
1. A common rail oil injector comprises an oil injector body (1), an electromagnetic valve assembly (2), an oil outlet metering valve (3), a control valve assembly and a needle valve (5); the inner cavity of the oil sprayer body (1) sequentially forms an electromagnetic valve mounting cavity, a metering valve mounting cavity, a control valve mounting cavity and a needle valve cavity from top to bottom; the control valve installation cavity is communicated with an oil inlet channel on the oil sprayer body (1), and the metering valve installation cavity is communicated with an oil outlet channel on the oil sprayer body (1); the electromagnetic valve assembly (2) is arranged in the electromagnetic valve installation cavity; the oil outlet metering valve (3) is arranged in the metering valve mounting cavity; the control valve assembly is arranged in the control valve installation cavity; the needle valve (5) is arranged in the needle valve cavity; the method is characterized in that:
the control valve assembly consists of a valve sleeve (4-1), a control valve (4-2), a return spring (4-3), a valve sleeve spring (4-4) and an oil pressure plunger (4-5);
the middle part of the inner hole of the valve sleeve (4-1) is provided with a sealing conical surface, an inner hole at the upper side of the sealing conical surface forms an upper control cavity, an inner hole at the lower side of the sealing conical surface forms a lower control cavity, and the aperture of the upper control cavity is larger than that of the lower control cavity; the upper part of the valve sleeve (4-1) is provided with a communication hole (4-1-1), and the communication hole (4-1-1) communicates the upper control cavity with the outer wall of the upper part of the valve sleeve (4-1);
an oil inlet groove (4-2-1) is formed in the upper end face of the control valve (4-2), an oil inlet connecting groove (4-2-2) is formed in the bottom of the oil inlet groove (4-2-1), an auxiliary oil inlet hole (4-2-3) is formed in the outer side of the oil inlet connecting groove (4-2-2), the auxiliary oil inlet hole (4-2-3) is used for communicating the oil inlet connecting groove (4-2-2) with the side wall of the control valve (4-2), and the aperture of the auxiliary oil inlet hole (4-2-3) is smaller than the diameter of an oil outlet metering hole (3-1) in the oil outlet metering valve (3); an oil outlet connecting groove (4-2-4) is formed in the lower end face of the control valve (4-2), an auxiliary oil outlet hole (4-2-5) is formed in the bottom of the oil outlet connecting groove (4-2-4), the auxiliary oil outlet hole (4-2-5) is used for communicating the oil outlet connecting groove (4-2-4) with the oil inlet groove (4-2-1), and the diameter of the auxiliary oil outlet hole (4-2-5) is smaller than that of the oil outlet metering hole (3-1); an oil inlet hole (4-2-6) is formed in one side of an oil outlet connecting groove (4-2-4) in the control valve (4-2), the upper port of the oil inlet hole (4-2-6) is positioned outside the oil inlet groove (4-2-1), the oil inlet hole (4-2-6) is used for communicating the upper end face and the lower end face of the control valve (4-2), and the diameter of the oil inlet hole (4-2-6) is larger than that of the oil outlet metering hole (3-1); the lower end of the control valve (4-2) is provided with a contact surface matched with the sealing conical surface;
the valve sleeve (4-1) is arranged below the oil outlet metering valve (3), the upper end of the oil pressure plunger (4-5) is sleeved in the lower control cavity, and the lower end of the oil pressure plunger (4-5) is positioned in the needle valve cavity; the middle part of the oil pressure plunger (4-5) is provided with a limiting ring, the valve sleeve spring (4-4) is sleeved on the oil pressure plunger (4-5), the upper end of the valve sleeve spring (4-4) is in contact with the lower end face of the valve sleeve (4-1), the lower end of the valve sleeve spring (4-4) is in contact with the upper end face of the limiting ring, the valve sleeve spring (4-4) is always in a compressed state, and the valve sleeve spring (4-4) supports the valve sleeve (4-1) against the lower end face of the oil outlet metering valve (3); when the oil pressure plunger (4-5) is positioned at the position of the maximum travel of the descending, the lower end surface of the oil pressure plunger (4-5) is contacted with the upper end surface of the needle valve (5);
the control valve (4-2) is arranged in the upper control cavity, and a gap is reserved between the lower end face of the control valve (4-2) and the upper end face of the oil pressure plunger (4-5); the communication hole (4-1-1) is communicated with the auxiliary oil inlet hole (4-2-3); the lower port of the oil inlet hole (4-2-6) is communicated with the lower control cavity, and the upper port of the oil inlet hole (4-2-6) is staggered with the lower port of the oil outlet metering hole (3-1); the oil outlet connecting groove (4-2-4) is communicated with the lower control cavity; the oil inlet groove (4-2-1) is communicated with the oil outlet metering hole (3-1), the auxiliary oil outlet hole (4-2-5) is opposite to the oil outlet metering hole (3-1), and the oil inlet connecting groove (4-2-2) is staggered with the lower port of the oil outlet metering hole (3-1); when the sealing conical surface is contacted with the contact surface, a gap is reserved between the upper end surface of the control valve (4-2) and the lower end surface of the oil outlet metering valve (3);
the return spring (4-3) is arranged between the control valve (4-2) and the oil pressure plunger (4-5), and the return spring (4-3) is always in a compressed state.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810278844.0A CN108412653B (en) | 2018-03-30 | 2018-03-30 | Common rail fuel injector |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810278844.0A CN108412653B (en) | 2018-03-30 | 2018-03-30 | Common rail fuel injector |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN108412653A CN108412653A (en) | 2018-08-17 |
| CN108412653B true CN108412653B (en) | 2023-11-03 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201810278844.0A Active CN108412653B (en) | 2018-03-30 | 2018-03-30 | Common rail fuel injector |
Country Status (1)
| Country | Link |
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| CN (1) | CN108412653B (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109139319B (en) * | 2018-09-27 | 2023-09-29 | 重油高科电控燃油喷射系统(重庆)有限公司 | Common rail fuel injector |
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| CN108412653A (en) | 2018-08-17 |
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Address after: 401120 No.6 cuining Road, jingkaiyuan, Liangjiang New District, Yubei District, Chongqing Applicant after: Heavy oil high tech electronic fuel injection system (Chongqing) Co.,Ltd. Address before: 401120 No.6 cuining Road, jingkaiyuan, Liangjiang New District, Yubei District, Chongqing Applicant before: CHONGQING FUEL INJECTION SYSTEM CO., LTD. OF CHINA NATIONAL HEAVY DUTY TRUCK Group Corp. |
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Address after: 401120 No.6 cuining Road, jingkaiyuan, Liangjiang New District, Yubei District, Chongqing Patentee after: Heavy Oil High Tech Electronic Fuel Injection System Co.,Ltd. Address before: 401120 No.6 cuining Road, jingkaiyuan, Liangjiang New District, Yubei District, Chongqing Patentee before: Heavy oil high tech electronic fuel injection system (Chongqing) Co.,Ltd. |
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