WO1999032788A1 - Fuel injection valve for an internal combustion engine - Google Patents
Fuel injection valve for an internal combustion engine Download PDFInfo
- Publication number
- WO1999032788A1 WO1999032788A1 PCT/EP1998/007858 EP9807858W WO9932788A1 WO 1999032788 A1 WO1999032788 A1 WO 1999032788A1 EP 9807858 W EP9807858 W EP 9807858W WO 9932788 A1 WO9932788 A1 WO 9932788A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- valve
- needle
- fuel injection
- fuel
- closing mechanism
- Prior art date
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
- F02M61/00—Fuel-injectors not provided for in groups F02M39/00 - F02M57/00 or F02M67/00
- F02M61/16—Details not provided for in, or of interest apart from, the apparatus of groups F02M61/02 - F02M61/14
- F02M61/20—Closing valves mechanically, e.g. arrangements of springs or weights or permanent magnets; Damping of valve lift
-
- 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
- F02M61/16—Details not provided for in, or of interest apart from, the apparatus of groups F02M61/02 - F02M61/14
- F02M61/20—Closing valves mechanically, e.g. arrangements of springs or weights or permanent magnets; Damping of valve lift
- F02M61/205—Means specially adapted for varying the spring tension or assisting the spring force to close the injection-valve, e.g. with damping of valve lift
Definitions
- the invention relates to a fuel injection valve for an internal combustion engine according to the preamble of claim 1.
- fuel injection valves are used for injecting fuel into the combustion chamber of the internal combustion engine, which have a valve needle which is axially displaceably mounted in a nozzle element and a valve seat which cooperates with the valve needle, and a valve closing mechanism which acts on the valve needle in the closing direction and which Have injection volume surrounding valve needle.
- the injection volume surrounding the valve needle is supplied with fuel to be injected under high pressure via a high-pressure channel, the valve needle being displaced in the opening direction against the force of the valve closing mechanism and the fuel being injected into the combustion chamber of the internal combustion engine when a predetermined opening pressure in the injection volume is exceeded.
- the object of the invention is therefore to provide a fuel injection valve for an internal combustion engine which is designed for operation with high opening pressure without starting difficulties occurring.
- a fuel injection valve for injecting fuel into the combustion chamber of an internal combustion engine contains a valve needle which is axially displaceably mounted in a nozzle element and a valve seat which interacts with the valve needle, as well as a valve closing mechanism which acts on the valve needle in the closing direction and an injection volume surrounding the valve needle.
- the injection volume is supplied with fuel to be injected under high pressure via a high-pressure duct, the valve needle being displaced in the opening direction against the force of the valve closing mechanism and the fuel being injected into the combustion chamber of the internal combustion engine when a predetermined opening pressure in the injection volume is exceeded.
- the fuel injection valve includes an adjusting device for reducing the force of the valve closing mechanism for the starting process of the internal combustion engine and a control device for controlling the length of time during which the force of the valve closing mechanism is reduced by the adjusting mechanism.
- valve closing mechanism engages the valve needle in
- Spring preload can be changed by the adjusting device.
- the adjusting device contains an adjusting piston which is axially displaceably arranged in a bore provided in the valve holder of the injection valve and which is coupled to the valve closing mechanism for adjusting the force acting on the valve needle.
- the adjusting piston can be coupled to the spring arrangement in order to change its spring preload.
- two stop devices are provided, by which two predetermined different closing forces of the valve closing mechanism are defined corresponding end positions of the adjusting piston.
- the stop devices have means for adjusting the end positions of the adjusting piston.
- the valve closing mechanism of the fuel injection valve contains two valve closing springs which are coupled mechanically in parallel between the valve needle and the adjusting device.
- the valve closing mechanism contains two valve closing springs arranged one behind the other in a bore provided in the valve holder of the injection valve and a thrust sleeve mounted axially displaceably in the bore, the first spring having one end via a first connecting rod to the valve needle and with the other end is coupled to the adjusting device via the thrust sleeve surrounding the second spring, and the second spring is coupled to one end via a second connecting rod penetrating the first spring and to the valve needle via the first connecting rod and the other end to the adjusting device is.
- the adjusting piston can be actuated by means of the leakage fuel which is under pressure and which occurs during operation.
- this is concretized in that a fuel mixing pressure channel leading from the valve needle to the side of the adjusting piston opposite the valve closing mechanism is formed in the fuel injection valve, via the leakage fuel accumulating at the valve needle to the side of the adjusting piston opposite the valve closing mechanism. bens is guided to gradually shift this in the direction increasing the closing force of the valve closing mechanism.
- control device is provided in the form of a control valve which is connected to the side of the adjusting piston which is acted upon by the leak fuel, with which the adjusting piston for sealing the direction reducing the closing force of the valve closing mechanism from Pressure of the existing leak fuel can be relieved. It is preferably provided that the control valve is connected to the fuel mixing pressure channel leading from the valve needle to the adjusting piston.
- the control valve is preferably designed as a needle valve with a valve needle having a needle tip and a valve seat receiving the needle tip, the valve needle optionally closing or releasing a relief bore through the valve seat to relieve the leakage fuel acting on the adjusting piston.
- the control valve preferably has a valve spring acting on the valve needle in the closing direction.
- control valve has a control piston which is coupled to the valve needle and can be acted upon in the opening direction of the needle valve by means of a gaseous or liquid medium.
- control piston is integrally formed with the valve needle and is acted upon by the gaseous or liquid medium on its side facing the needle tip and is supported on its side facing away from the needle tip against the valve spring acting on the valve needle in the closing direction.
- control valve is designed as a safety valve which opens automatically when a predetermined fuel pressure is exceeded and relieves the pressure on the adjusting piston.
- control valve is designed as a safety valve, the strength of the valve spring being dimensioned such that the control valve when a predetermined value is exceeded
- Fuel pressure opens automatically and relieves the pressure on the adjusting piston.
- the actuating piston on the side facing the valve closing mechanism is connected to a channel carrying the fuel pressure in order to be acted upon by a mixed pressure of opening pressure and residual pressure in the injection line.
- the adjusting piston can be acted upon by an external hydraulic or pneumatic pressure.
- La shows a longitudinal section through an exemplary embodiment of a fuel injection valve according to the invention.
- FIG. Lb an enlarged section of Fig. La), in which the control valve of the fuel injection valve according to an exemplary embodiment of the invention is shown in detail.
- the reference numeral 1 denotes a valve holder in which all the essential components of the fuel injection valve are accommodated and stored
- the reference numeral 6 denotes a nozzle element which contains the components of the actual e-spray nozzle.
- a valve needle 2 is axially displaceably mounted in the nozzle element 6 and cooperates with a valve seat 4 in the sense of opening and closing an injection nozzle formed thereby.
- a valve Til locking mechanism housed, which is formed by a first connecting rod 8, a second connecting rod 10, a first valve closing spring 12, a second valve closing spring 13, a thrust sleeve 14 and a guide sleeve 15 arranged on the thrust sleeve 14.
- the first connecting rod 8 is slidably mounted in a first bore 9 of the valve holder 1 in the axial direction and is coupled to the valve needle 2
- the second connecting rod 10 is axially displaceably mounted in the guide sleeve 15 of the push sleeve 14 and is coupled to the first connecting rod 8 and the push sleeve 14 is slidably mounted in a second bore 11 of the valve holder 1 in the axial direction.
- the first valve closing spring 12 acts between the first connecting rod 8 and the thrust sleeve 14, while the second valve closing spring 13 acts between the second connecting rod 10 and a thrust piece 16, which is likewise axially displaceably mounted in the second bore 11 of the valve holder 1.
- the thrust piece 16 also acts on the thrust sleeve 14.
- valve needle 2 Surrounding the valve needle 2 is an injection volume 24, to which fuel under high pressure is fed via a high-pressure channel 25 for injection into the combustion chamber of the internal combustion engine.
- a predetermined pressure which is determined by the pretension of the two valve closing springs 12, 13, the valve needle 2 is lifted out of the valve seat 4 and the fuel is injected from the injection volume 24 through nozzle openings 5 into the combustion chamber of the internal combustion engine.
- leakage fuel creeping between the valve needle 2 and the nozzle element 6 is collected in a fuel collecting bore 29 and discharged via a fuel mixing pressure channel 26.
- an adjusting device for changing the force of the valve closing mechanism formed by the elements 8, 10, 12, 13, 14, 15, in order to allow the fuel to be injected with a lower fuel pressure for the starting process of the internal combustion engine.
- This setting device is in the in Fig. La)
- the exemplary embodiment of the fuel injection valve shown is formed by an adjusting piston 17, which is slidably arranged in a third bore 18 formed in the valve holder 1 in the axial direction of the valve holder 1. On its circumference, the adjusting piston 17 is provided with a sealing ring 19, which seals its circumference against the third bore 18.
- the adjusting piston 17 is displaceable in the third bore 18 between two end positions defined by stop devices, namely on the one hand a stop flank 18a on the side of the adjusting piston 17 facing the valve closing mechanism and a stop 21 on the opposite side, against which a stop adjusting screw 20 strikes, which in a thread is screwed into the adjusting piston 17.
- the stop 21 is in turn screwed into a sealing plug 22 and is adjustable by means of a stop adjusting screw 23.
- the sealing plug 22 closes the rear end of the valve holder 1.
- the adjusting piston 17 is provided with a stop bolt 20a, which can also be adjusted by means of an E adjusting screw, by the amount between the pushing piece 16 and the adjusting piston 17 to be defined.
- the valve closing mechanism can be brought into two states, namely in a first state, in which the adjusting piston 17 is in its rear end position and thus the thrust piece 16 and the thrust sleeve 14 are displaced to the left in the illustration of the figure. are pushed so that the two valve closing springs 12 and 13 are relieved to a certain extent. In this state, the valve needle 2 opens.
- the adjusting piston 17 is in contact with the stop edge 18a, so that the thrust piece 16 and the thrust sleeve 14 are shifted to the right, as a result of which the two valve closing springs 12 and 13 are pretensioned more strongly, so that the valve needle 2 only comes in at opens a higher pressure in the injection volume 24.
- the fuel is injected into the combustion chamber of the internal combustion engine under high pressure and thus in a very short time.
- the fuel pressures corresponding to the two end positions of the adjusting piston 17 can be 300 or 900 bar, for example.
- the adjusting piston 17 is adjusted in the following way.
- the adjusting piston 17 When the internal combustion engine is at a standstill, the adjusting piston 17 is in its left end position, into which it has been brought by the force of the two valve closing springs 12 and 13.
- the adjusting piston 17 After starting the internal combustion engine, the adjusting piston 17 is gradually displaced in the direction of the stop edge 18a by the leakage fuel flowing from the fuel collecting bore 29 via the mixed fuel pressure channel 26 and the connecting channel 27 to the rear side of the adjusting piston 17 until it finds its end position there.
- the speed at which the piston 17 is displaced that is to say the duration of its displacement, is determined by the amount of the leaked fuel supplied via the fuel mixing pressure duct 26 and the connecting duct 27.
- the control valve 30 is provided in order to achieve a defined and, if necessary, rapid relief of the rear side of the adjusting piston 17 and thus a displacement thereof and a reduction in the required opening pressure.
- Fig. Lb the control valve 30 is shown enlarged and will now be explained in detail.
- the control valve 30 contains a valve needle 34 which has a needle tip 35.
- the needle tip 35 is received by a valve seat 36 which is penetrated by a bore which leads to the fuel mixing pressure channel 26.
- the front part of the valve needle 34 is surrounded by a cavity 39 which is connected to a drain hole 50.
- the valve needle 34 is sealed by means of a sealing 38 against a bore 37 in which the valve needle 34 is arranged to be axially displaceable
- a cavity 60 At the front of the control piston 31 there is a cavity 60.
- a valve spring 41 On the back of the control piston 31 there is a valve spring 41, which is shown in broken lines in the figure, which is at one end against the control piston 31 and at its other end against a stop 42 supports, which is located on a screw bolt 43 which is screwed into the rear end of the valve holder 1 and closes the bore accommodating the control valve 30.
- a stop rod 40 which passes through the screw plug 43 can be adjusted by means of an adjusting nut 44.
- a clearance H can be set between the stop rod 40 and a rear extension 45 on the control piston 31, by which the control piston 31 can be displaced between two end positions.
- a liquid or gaseous medium can be supplied to the cavity 60 via a bore or a channel (not shown in the figure), with which the control piston 31 can be displaced against the force of the valve spring 41 m, its rear end position, so that the needle tip 35 of the valve needle 34 raised from the valve seat 36 and the bore passing through the valve seat 36 is released.
- the space on the rear side of the adjusting piston 17 is via the connecting channel 27 and the fuel mixing pressure channel 26 can be relieved, the leak fuel flowing through the bore passing through the valve seat 36 of the control valve 30 and the cavity 39 into the drain hole 50, from where it is admixed, for example, with the remaining leak fuel of the injection valve.
- the starting air is suitable for engines started with air. If this is printed into the cavity 60 during the starting process, the control piston 31 is immediately brought into its rear end position, the control valve 30 is opened and thus the rear side of the actuating piston 17 is relieved and this is brought into its rear end position and the valve closing mechanism is relieved.
- the cavity 60 can also be acted upon by an external hydraulic fluid or an external gaseous medium.
- control valve 30 Another function of the control valve 30 is that of a safety valve.
- the strength of the valve spring 41 is dimensioned such that when a critical pressure is exceeded on the rear side of the adjusting piston 17, which propagates via the connecting channel 27 and the fuel mixing pressure channel 26 onto the needle tip 35 of the valve needle 34, the needle tip 35 is lifted out of the valve seat 36 and thus the space on the back of the adjusting piston 17 is relieved.
- This safety function of the control valve 30 reliably protects the mechanics of the fuel injection valve from possible overloading due to excess pressure.
Abstract
Description
Claims
Priority Applications (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP2000525683A JP2001527186A (en) | 1997-12-18 | 1998-12-03 | Fuel injection valve for internal combustion engine |
EP98959908A EP1040271A1 (en) | 1997-12-18 | 1998-12-03 | Fuel injection valve for an internal combustion engine |
KR1020007006636A KR20010033228A (en) | 1997-12-18 | 1998-12-03 | Fuel injection valve for an internal combustion engine |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE19756411.9 | 1997-12-18 | ||
DE19756411 | 1997-12-18 |
Publications (1)
Publication Number | Publication Date |
---|---|
WO1999032788A1 true WO1999032788A1 (en) | 1999-07-01 |
Family
ID=7852449
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/EP1998/007858 WO1999032788A1 (en) | 1997-12-18 | 1998-12-03 | Fuel injection valve for an internal combustion engine |
Country Status (5)
Country | Link |
---|---|
EP (1) | EP1040271A1 (en) |
JP (1) | JP2001527186A (en) |
KR (1) | KR20010033228A (en) |
DE (1) | DE19825171A1 (en) |
WO (1) | WO1999032788A1 (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2004057181A1 (en) * | 2002-12-20 | 2004-07-08 | Volkswagen Mechatronic Gmbh & Co. Kg | Pump-nozzle unit and method for regulating the opening pressure of the same |
Families Citing this family (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE10020867B4 (en) * | 2000-04-28 | 2006-07-06 | Robert Bosch Gmbh | Common rail injector |
DE10126954A1 (en) * | 2001-06-01 | 2002-12-12 | Bosch Gmbh Robert | Injector for injecting fuel under high pressure has biased spring fixed at one end, supported on needle via pressure body at distance from injector housing wall at other to exert closing force |
DE102009007095A1 (en) * | 2009-02-02 | 2010-08-05 | Continental Automotive Gmbh | Injector |
Citations (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE875279C (en) * | 1941-12-31 | 1953-04-30 | Cav Ltd | Fuel injection nozzle for internal combustion engines |
FR1531448A (en) * | 1967-04-14 | 1968-07-05 | Moteur Moderne Le | Slave Internal Combustion Engine Fuel Injector |
US4261513A (en) * | 1978-09-26 | 1981-04-14 | Lucas Industries Limited | Fuel injection nozzles |
US4403585A (en) * | 1980-12-15 | 1983-09-13 | Diesel Kiki Co., Ltd. | Fuel injection nozzle system |
JPS6480763A (en) * | 1987-09-24 | 1989-03-27 | Hino Motors Ltd | Two-stage valve opening nozzle for diesel engine |
-
1998
- 1998-06-05 DE DE19825171A patent/DE19825171A1/en not_active Withdrawn
- 1998-12-03 JP JP2000525683A patent/JP2001527186A/en active Pending
- 1998-12-03 KR KR1020007006636A patent/KR20010033228A/en not_active Application Discontinuation
- 1998-12-03 EP EP98959908A patent/EP1040271A1/en not_active Withdrawn
- 1998-12-03 WO PCT/EP1998/007858 patent/WO1999032788A1/en not_active Application Discontinuation
Patent Citations (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE875279C (en) * | 1941-12-31 | 1953-04-30 | Cav Ltd | Fuel injection nozzle for internal combustion engines |
FR1531448A (en) * | 1967-04-14 | 1968-07-05 | Moteur Moderne Le | Slave Internal Combustion Engine Fuel Injector |
US4261513A (en) * | 1978-09-26 | 1981-04-14 | Lucas Industries Limited | Fuel injection nozzles |
US4403585A (en) * | 1980-12-15 | 1983-09-13 | Diesel Kiki Co., Ltd. | Fuel injection nozzle system |
JPS6480763A (en) * | 1987-09-24 | 1989-03-27 | Hino Motors Ltd | Two-stage valve opening nozzle for diesel engine |
Non-Patent Citations (1)
Title |
---|
PATENT ABSTRACTS OF JAPAN vol. 013, no. 287 (M - 844) 30 June 1989 (1989-06-30) * |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2004057181A1 (en) * | 2002-12-20 | 2004-07-08 | Volkswagen Mechatronic Gmbh & Co. Kg | Pump-nozzle unit and method for regulating the opening pressure of the same |
Also Published As
Publication number | Publication date |
---|---|
JP2001527186A (en) | 2001-12-25 |
DE19825171A1 (en) | 1999-07-01 |
KR20010033228A (en) | 2001-04-25 |
EP1040271A1 (en) | 2000-10-04 |
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