EP2092187A1 - Injector for injecting fuel - Google Patents
Injector for injecting fuelInfo
- Publication number
- EP2092187A1 EP2092187A1 EP07820133A EP07820133A EP2092187A1 EP 2092187 A1 EP2092187 A1 EP 2092187A1 EP 07820133 A EP07820133 A EP 07820133A EP 07820133 A EP07820133 A EP 07820133A EP 2092187 A1 EP2092187 A1 EP 2092187A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- valve
- guide pin
- chamber
- injector
- housing part
- 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.)
- Granted
Links
Classifications
-
- 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
- F02M47/00—Fuel-injection apparatus operated cyclically with fuel-injection valves actuated by fluid pressure
- F02M47/02—Fuel-injection apparatus operated cyclically with fuel-injection valves actuated by fluid pressure of accumulator-injector type, i.e. having fuel pressure of accumulator tending to open, and fuel pressure in other chamber tending to close, injection valves and having means for periodically releasing that closing pressure
- F02M47/027—Electrically actuated valves draining the chamber to release the closing pressure
-
- 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
-
- 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
- F02M63/0031—Valves characterized by the type of valves, e.g. special valve member details, valve seat details, valve housing details
- F02M63/004—Sliding valves, e.g. spool valves, i.e. whereby the closing member has a sliding movement along a seat for opening and closing
-
- 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
- F02M63/007—Details not provided for in, or of interest apart from, the apparatus of the groups F02M63/0014 - F02M63/0059
- F02M63/0078—Valve member details, e.g. special shape, hollow or fuel passages in the valve member
-
- 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
- F02M63/007—Details not provided for in, or of interest apart from, the apparatus of the groups F02M63/0014 - F02M63/0059
- F02M63/0078—Valve member details, e.g. special shape, hollow or fuel passages in the valve member
- F02M63/008—Hollow valve members, e.g. members internally guided
Definitions
- the invention relates to an injector for injecting fuel in a combustion chamber of an internal combustion engine according to the preamble of claim 1.
- fuel injectors are used in the stroke-controlled high-pressure accumulator injection systems, which are operated with 2/2-way control valves.
- a control chamber with a fuel supply is supplied through the fuel at system pressure fuel supplied, or connected to a fuel return in the low pressure range.
- This allows the pressure in the control room to be set to system pressure or to return pressure.
- the pressure prevailing in the control chamber acts on a control piston, which in turn is connected to an injection valve member.
- the injection valve member At high pressure in the control chamber so the injection valve member is placed in his seat and the injection openings are closed.
- the injection valve member lifts from its seat and fuel is injected into the internal combustion engine.
- the control valve comprises a valve stem, with which a connection from a control chamber is releasable or closable in a fuel return.
- a bore is formed, in which a guide pin is received, which surrounds a valve space which is hydraulically connected to the control chamber with the wall of the bore in the valve stem, wherein the guide pin by the pressure prevailing in the valve space against a bearing surface is pressed, whereby the valve stem is aligned.
- valve stem or the armature of the solenoid valve is guided over fixedly connected to the fuel injector guide components. It is necessary to integrate the armature guide in the magnetic recording, resulting in a complicated structure and expensive component.
- Advantage of the injector according to the invention over this known from the prior art injector is that the guide pin is pressed due to the high injection pressure with a large force from the valve chamber against a stop surface. This force can be used as a contact pressure for the guide pin. The guide pin is held in this position.
- the guide pin is preferably aligned at right angles over the contact surface in the case of a flat seat.
- the guide pin in a first embodiment, is placed against the injector housing by the pressure prevailing in the valve space and thereby held in position.
- at least one further component is received between the guide pin and the injector housing, wherein the guide pin is placed against the further component.
- the further component is provided, for example, by this pressure force and possibly a spring force against the injector.
- the further component can also be formed integrally with the injector housing and form, for example, a part of the magnet assembly.
- an extension is formed on the guide pin, which is provided with one side against the injector and on the other side as a compression spring executed spring element acts, which is received between the extension and the valve stem.
- Advantage of the spring element, which is received between the extension of the guide pin and the valve stem is that is pressed by the spring force, which is exerted by the spring element and acting on the extension of the guide pin, the guide pin with the extension against the injector.
- control valve is magnet-actuated and an armature of the solenoid-operated control valve is formed on the valve stem.
- the armature is formed on the valve stem, the number of required components can be reduced.
- the mass of the moving components is reduced, so that a faster opening and closing of the control valve is possible.
- annular closure element is formed on the valve stem.
- the annular closing element is preferably configured such that the diameter of the bore in the valve tappet and the inner diameter of the annular closing element are approximately equal. Due to the approximately equal diameter of the valve tappet is pressure balanced. It is therefore not necessary to apply an additional force for closing the control valve, which counteracts the pressure force in the valve chamber. The smaller forces required mean that a faster opening and closing of the control valve is possible. The course of injection can be better adapted to the operating conditions of the internal combustion engine.
- the annular closing element on the valve tappet is designed, for example, as a sealing surface, which can be placed in a valve seat.
- the valve seat into which the annular closure element is placed in order to close the control valve is designed, for example, as a flat seat, a conical seat or a ball seat.
- the annular closing element is a conical sealing surface and the valve seat is formed as a spherical surface. Advantage of this embodiment is that no increased parallelism requirements are placed on the contact surface of the guide pin and the valve seat.
- the spherical surface of the valve seat has a joint function, wherein the compensation of a possible axial offset takes place by radial displacement of the guide pin on its contact surface.
- the valve seat formed as a spherical surface also allows a liquid-tight closing of the control valve at an inclination of the valve piston against the injector.
- Figure 1 shows a erf ⁇ ndungshiel trained control valve in a first embodiment.
- an injection valve member which releases or closes at least one injection opening, is actuated by means of a control valve 1.
- the control valve 1 is actuated by an actuator 3.
- the actuator 3 is a Magnetic actuator. This comprises a coil 5, which is accommodated in a magnetic core 7.
- a different actuator for example a piezoelectric actuator, instead of a magnetic actuator.
- the control valve 1 further comprises a valve tappet 9, which in the embodiment illustrated here comprises an annular closing element 11.
- a valve tappet 9 which in the embodiment illustrated here comprises an annular closing element 11.
- the annular closing element 11 is placed in a valve seat 13.
- the valve seat 13 is a flat seat.
- a bore 15 is formed in the valve stem 9.
- a guide pin 17 is received in the bore 15, a guide pin 17 is received.
- the bore 15 acts simultaneously as a guide for the valve stem 9.
- the valve stem 9 is guided on the guide pin 17.
- an extension 21 is formed, which rests with a surface 23 on an upper housing part 25 of the injector.
- a step 27 is further formed, which acts as a stroke limiter for the valve tappet 9. By striking the step 27, the movement of the valve stem 9 is stopped.
- the guide pin 17 and the bore 15 enclose a valve chamber 29.
- a channel 31 connects, which opens into a control chamber, not shown here.
- a throttle element 33 is formed in the channel 31, a throttle element 33 is formed. Through the throttle element 33 a back pressure independent flow is ensured. This also ensures a back pressure-dependent control chamber pressure.
- the bore 15 and the surface of the guide pin 17 are fitted to each other so that the bore 15 and the surface of the guide pin 17 act as a sealing surface ,
- valve tappet 9 can be moved by the actuator 3
- an armature 35 is formed on the valve tappet 9 in the embodiment shown here.
- the stroke of the valve stem 9 is adjusted by an adjusting ring 37 which is received between the upper housing part 25 and a central housing part 39.
- the setting of the stroke takes place via the height h of the adjusting ring 37th
- the upper housing part 25 and the middle housing part 39 are connected to each other by a clamping sleeve 41.
- the clamping sleeve 41 is located on a shoulder 43 at the top Housing part 25 and is screwed with a thread 45 on the central housing part. So that no fuel can escape at the injector along the connection of the upper housing part 25 and the middle housing part 39, a sealing ring 47 is received between the upper housing part 25 and the middle housing part 39.
- the guide pin 17 is enclosed by a spring element 49.
- the spring element 49 is preferably designed as a compression spring coil spring.
- the spring element 49 is supported on one side on the valve tappet 9 and on the other side on the extension 21 of the guide pin 17. In order to adjust the spring force of the spring element 49, it is possible to position a shim 51 between the spring element and the extension 21. By the height of the dial 51, the bias of the spring element 49 is set.
- the coil 5 is energized. This forms a magnetic field around the coil, through which the armature 35 is attracted.
- the valve stem 9 with the armature formed thereon rises with the annular closing element 11 from the valve seat 13.
- a connection from the valve chamber 29 in the fuel return is released.
- the pressure in the valve chamber 29 drops. Due to the decreasing pressure in the valve chamber 29 fuel flows through the channel 31 with the throttle element 33 from the control chamber, not shown here.
- the pressure in the control room also decreases. Due to the decreasing pressure in the control chamber, the control piston is moved in the direction of the control chamber.
- the injection valve member rises from its seat and thus releases the at least one injection opening. Fuel is injected into the combustion chamber of the internal combustion engine.
- valve stem 9 is provided with the aid of the spring force of the spring element 49 with its annular closing element 11 in the valve seat 13.
- the connection from the valve chamber 29 in the low pressure region is closed.
- the fuel flowing into the control chamber leads to an increase in pressure in the control chamber and thus also in the valve chamber 29, which is hydraulically connected to the control chamber via the channel 31 and the throttle element 33.
- On the guide pin 17 again affects the pressure force of the fuel under system pressure.
- the control piston in the direction of the injection valve member and the injection valve member is placed in its seat to close the at least one injection port.
- FIG. 2 shows a control valve according to the invention designed in a second embodiment.
- control valve shown in Figure 2 differs from the control valve shown in Figure 1 by the formation of the guide pin 17th
- a further component 53 is received between the guide pin 17 and the upper housing part 25.
- the extension 21 is formed, against which the spring element 49 is supported.
- the guide pin 17 is provided with an end face 55 against the further component 53.
- the guide pin 17 is held by the pressure force acting in the valve chamber 29 on this, in its position.
- the pressure force acting on the guide pin 17 is transmitted via the end face 55 to the further component 53.
- the further component 53 with the extension 21 is placed against the upper housing part 25.
- the spring force of the spring element 49 which likewise sets this against the upper housing part 25, acts on the further component 53. In this way, the further component 53 is held in position.
- valve 1 does not drop to ambient pressure due to the fuel flowing over the control chamber and the channel 31, the guide pin 10 is held in its bearing on the further component 53 in the embodiment shown in Figure 2, whereby the valve stem 9 is aligned with the valve seat 13.
- the further component 53 is formed integrally with the upper housing part 25.
- Figure 3 shows an inventively designed control valve in a third embodiment.
- the control valve 1 shown in Figure 3 differs from the embodiment shown in Figure 1 by the formation of the valve seat 13 and the annular closing element 11.
- the annular closure member 11 is designed with a conical sealing surface.
- the valve seat 13 is designed as a spherical surface.
- Advantage of the ball-shaped valve seat 13 relative to a flat seat is that the valve seat 13, the sealing surface of the annular closure member 11 and the surface 23 of the extension 21, which rests against the upper housing part 25, need not be made exactly parallel to a liquid-tight closing allow the valve 1.
- Due to the design of the valve seat 13 as a spherical surface of this has a joint function. A liquid-tight closing is thus ensured even if the conical sealing surface of the annular closing element 11 is not formed exactly parallel.
- a possible axial offset of the guide pin 17 is compensated by radial displacement of the guide pin 17 on the surface 23.
- valve seat 13 and the annular closing element 11 are formed as a flat seat.
- valve seat 13 it is also possible for the valve seat 13 to be cone-shaped and the annular closing element 11 to be provided with a conical sealing surface, wherein the cone angles of the conical valve seat 13 and the conical sealing surface preferably have a difference in the range of 1 ° to 5 °, so that the surface pressure of the annular closure member 11 is concentrated in the conically shaped valve seat 13 on a line.
- the annular closing element 11 and the valve seat 13 may assume any geometry known and suitable to the person skilled in the art.
Landscapes
- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Fluid Mechanics (AREA)
- Fuel-Injection Apparatus (AREA)
Abstract
Description
Claims
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE102006053128A DE102006053128A1 (en) | 2006-11-10 | 2006-11-10 | Injector for injecting fuel |
PCT/EP2007/059530 WO2008055724A1 (en) | 2006-11-10 | 2007-09-11 | Injector for injecting fuel |
Publications (2)
Publication Number | Publication Date |
---|---|
EP2092187A1 true EP2092187A1 (en) | 2009-08-26 |
EP2092187B1 EP2092187B1 (en) | 2011-11-30 |
Family
ID=38989898
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP07820133A Not-in-force EP2092187B1 (en) | 2006-11-10 | 2007-09-11 | Injector for injecting fuel |
Country Status (5)
Country | Link |
---|---|
EP (1) | EP2092187B1 (en) |
CN (1) | CN101535625B (en) |
AT (1) | ATE535704T1 (en) |
DE (1) | DE102006053128A1 (en) |
WO (1) | WO2008055724A1 (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP2749800A1 (en) * | 2011-09-28 | 2014-07-02 | Nabtesco Corporation | Solenoid valve |
Families Citing this family (9)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE102006057025A1 (en) * | 2006-12-04 | 2008-06-05 | Robert Bosch Gmbh | Fuel injector for injecting fuel into combustion chamber of internal combustion engine, has pressure-compensating magnetic valve with valve element that opens or locks valve seat, where valve element or piece of valve has spherical surface |
DE102007018472A1 (en) * | 2007-04-19 | 2008-10-23 | Robert Bosch Gmbh | Fuel injector with solenoid valve |
DE102007025614A1 (en) * | 2007-06-01 | 2008-12-04 | Robert Bosch Gmbh | Armature stroke adjustment for solenoid valve |
DE102007025964A1 (en) * | 2007-06-04 | 2008-12-11 | Robert Bosch Gmbh | Hydraulic valve for a fuel injector |
DE102007025961A1 (en) * | 2007-06-04 | 2008-12-11 | Robert Bosch Gmbh | injector |
DE102007044357A1 (en) * | 2007-06-21 | 2008-12-24 | Robert Bosch Gmbh | Control valve for a fuel injection valve |
DE102007047425A1 (en) | 2007-10-04 | 2009-04-09 | Robert Bosch Gmbh | Control valve for a fuel injector |
DE102009000284A1 (en) | 2009-01-19 | 2010-07-22 | Robert Bosch Gmbh | Fuel injection valve device for injection of fluid from high pressure chamber into combustion chamber of internal combustion engine, has retaining body interrupting connection so that retaining pressure is larger than return pressure |
DE102014205517A1 (en) | 2014-03-25 | 2015-10-01 | Robert Bosch Gmbh | Switching valve for a fuel injector and fuel injector |
Family Cites Families (7)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE10118053A1 (en) * | 2001-04-11 | 2002-10-24 | Bosch Gmbh Robert | Valve for controlling liquids e.g. for vehicle fuel injection system, has hydraulic chamber that transfers control piston movement to actuating piston, which is in hydraulic force equilibrium with valve element closed |
JP3960283B2 (en) * | 2003-09-01 | 2007-08-15 | トヨタ自動車株式会社 | Fuel injection device for internal combustion engine |
JP4119812B2 (en) * | 2003-09-19 | 2008-07-16 | ボッシュ株式会社 | Fuel injection valve |
ES2277229T3 (en) * | 2004-06-30 | 2007-07-01 | C.R.F. Societa Consortile Per Azioni | SERVOVALVULA TO CONTROL THE FUEL INJECTOR OF AN INTERNAL COMBUSTION ENGINE. |
JP4025768B2 (en) * | 2004-09-27 | 2007-12-26 | 株式会社ケーヒン | Fuel injection valve |
DE102006021741A1 (en) * | 2006-05-10 | 2007-11-15 | Robert Bosch Gmbh | Fuel injector with pressure compensated control valve |
DE102006021736A1 (en) * | 2006-05-10 | 2007-11-15 | Robert Bosch Gmbh | Fuel injector with pressure compensated control valve |
-
2006
- 2006-11-10 DE DE102006053128A patent/DE102006053128A1/en not_active Withdrawn
-
2007
- 2007-09-11 EP EP07820133A patent/EP2092187B1/en not_active Not-in-force
- 2007-09-11 WO PCT/EP2007/059530 patent/WO2008055724A1/en active Application Filing
- 2007-09-11 AT AT07820133T patent/ATE535704T1/en active
- 2007-09-11 CN CN200780041616.1A patent/CN101535625B/en not_active Expired - Fee Related
Non-Patent Citations (1)
Title |
---|
See references of WO2008055724A1 * |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP2749800A1 (en) * | 2011-09-28 | 2014-07-02 | Nabtesco Corporation | Solenoid valve |
EP2749800A4 (en) * | 2011-09-28 | 2015-04-08 | Nabtesco Corp | Solenoid valve |
Also Published As
Publication number | Publication date |
---|---|
DE102006053128A1 (en) | 2008-05-15 |
ATE535704T1 (en) | 2011-12-15 |
EP2092187B1 (en) | 2011-11-30 |
CN101535625A (en) | 2009-09-16 |
WO2008055724A1 (en) | 2008-05-15 |
CN101535625B (en) | 2013-01-02 |
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