EP1573196A1 - Injector comprising a device for sealing an actuator unit, and sealing ring - Google Patents
Injector comprising a device for sealing an actuator unit, and sealing ringInfo
- Publication number
- EP1573196A1 EP1573196A1 EP03813532A EP03813532A EP1573196A1 EP 1573196 A1 EP1573196 A1 EP 1573196A1 EP 03813532 A EP03813532 A EP 03813532A EP 03813532 A EP03813532 A EP 03813532A EP 1573196 A1 EP1573196 A1 EP 1573196A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- ring
- injector
- plastic ring
- sealing
- housing
- 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
- 238000007789 sealing Methods 0.000 title claims abstract description 27
- 229920003023 plastic Polymers 0.000 claims abstract description 32
- 239000000446 fuel Substances 0.000 claims abstract description 31
- 239000002184 metal Substances 0.000 claims abstract description 26
- 238000002485 combustion reaction Methods 0.000 claims abstract description 7
- 230000009975 flexible effect Effects 0.000 claims abstract description 6
- 238000006073 displacement reaction Methods 0.000 claims abstract 3
- 238000002347 injection Methods 0.000 claims description 13
- 239000007924 injection Substances 0.000 claims description 13
- 229920001971 elastomer Polymers 0.000 claims description 3
- 239000000806 elastomer Substances 0.000 claims description 3
- 229920002457 flexible plastic Polymers 0.000 claims description 3
- 238000003780 insertion Methods 0.000 claims description 3
- 230000037431 insertion Effects 0.000 claims description 3
- 238000003825 pressing Methods 0.000 claims description 2
- 238000004519 manufacturing process Methods 0.000 description 5
- 239000000243 solution Substances 0.000 description 5
- 239000012528 membrane Substances 0.000 description 4
- 238000004026 adhesive bonding Methods 0.000 description 3
- 230000008859 change Effects 0.000 description 3
- 238000000034 method Methods 0.000 description 3
- 230000008901 benefit Effects 0.000 description 2
- 230000008878 coupling Effects 0.000 description 2
- 238000010168 coupling process Methods 0.000 description 2
- 238000005859 coupling reaction Methods 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 239000002245 particle Substances 0.000 description 2
- 238000012805 post-processing Methods 0.000 description 2
- 230000036316 preload Effects 0.000 description 2
- 238000004140 cleaning Methods 0.000 description 1
- 230000001419 dependent effect Effects 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 230000018109 developmental process Effects 0.000 description 1
- 238000005553 drilling Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 229920000642 polymer Polymers 0.000 description 1
- 230000008569 process Effects 0.000 description 1
- 230000002441 reversible effect Effects 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
- 239000007921 spray Substances 0.000 description 1
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
- F02M61/18—Injection nozzles, e.g. having valve seats; Details of valve member seated ends, not otherwise provided for
- F02M61/188—Spherical or partly spherical shaped valve member ends
-
- 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
- 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
- F02M61/12—Other injectors with elongated valve bodies, i.e. of needle-valve type characterised by the provision of guiding or centring means for valve bodies
-
- 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
- F02M61/166—Selection of particular materials
-
- 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
- F02M61/168—Assembling; Disassembling; Manufacturing; Adjusting
-
- 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
- F02M2200/21—Fuel-injection apparatus with piezoelectric or magnetostrictive elements
-
- 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
- F02M2200/70—Linkage between actuator and actuated element, e.g. between piezoelectric actuator and needle valve or pump plunger
- F02M2200/701—Linkage between actuator and actuated element, e.g. between piezoelectric actuator and needle valve or pump plunger mechanical
-
- 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
- F02M2200/70—Linkage between actuator and actuated element, e.g. between piezoelectric actuator and needle valve or pump plunger
- F02M2200/703—Linkage between actuator and actuated element, e.g. between piezoelectric actuator and needle valve or pump plunger hydraulic
-
- 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
- F02M2200/90—Selection of particular materials
- F02M2200/9015—Elastomeric or plastic materials
Definitions
- Injector with a device for sealing an actuator unit and a sealing ring
- the invention is based on an injector for fuel injection into an internal combustion engine, in which an actuator unit is arranged in a housing, or a sealing ring according to the type of the independent claims 1 and 9. It is already known that when a control voltage is applied to a piezoelectric actuator, in particular, whose change in length is used to control a servo valve or a nozzle needle in such a way that a certain amount of fuel can emerge from a nozzle in a finely atomized manner.
- the moving parts of the actuator unit must be sealed to protect them from the leakage space located below the actuator unit, in which there is fuel with a high overpressure. Furthermore, the seal must allow a centering pin of the actuator unit to be guided as centered as possible and must not impair the linear expansion of the actuator unit, which is in the ⁇ m range.
- the invention is based on the object of improving the seal between the actuator unit and the leakage space on an injector for fuel injection into an internal combustion engine. This object is achieved with the features of the independent claims 1 and 9.
- the injector according to the invention for fuel injection into an internal combustion engine or the sealing ring with the characterizing features of the independent claims 1 and 9 has the advantage that the device with the flexible plastic ring is inexpensive to manufacture and works without wear, since the crank pin is fixed to the plastic ring connected is. It is considered to be particularly advantageous that the crank pin can be cleaned easily and reliably after the post-processing, since the plastic ring has a simple geometric shape to which no dirt or grinding particles can adhere. Another advantage is the particularly simple assembly technique, as the metal ring that seals and firmly encloses the plastic ring fits exactly to the see position of the housing inner wall of the injector can be pushed and fixed here.
- a particularly simple method for connecting the plastic ring to the crank pin is seen by vulcanizing or gluing. These manufacturing processes are easy to control and cost-effective to use.
- the plastic ring is matched to the prevailing fuel pressure and / or the stroke of the actuator unit. Since, for example, a much higher pressure is used in diesel injection than in high-pressure gasoline injection, it is necessary to adapt the elasticity and / or the geometric properties of the plastic ring accordingly.
- the stroke of the actuator unit and thus the movement of the nozzle needle is also an important variable since the amount of fuel to be injected can be controlled very easily via the stroke.
- a particularly advantageous solution is also seen in the choice of a suitable type of elastomer.
- the type of elastomer must in particular be resistant to the type of fuel used so that it can reliably perform its sealing function at least over the expected life of the injector.
- the solution of designing the metal ring with regard to its dimensions in such a way that it fits in a drilling tion of the housing can be fixed by pressing. With a suitable tool, the metal ring can thus be easily pressed into the desired position of the bore and fixed there.
- a predetermined press-in depth can also be used to generate a specific preload for the plastic ring.
- the flexible plastic ring acts like a resilient element in addition to its sealing and centering functions. A separate spring element can then advantageously be saved.
- FIG. 1 shows, in a Scherriatic representation, sections of an injector with an actuator unit and with a device with a sealing ring and
- Figure 2 shows the schematic structure of an injector for fuel injection.
- FIG. 1 only shows the parts which relate to the actuator unit 2, the device with the sealing ring 4, 5 and the housing 1 of the injector.
- a servo valve, a nozzle needle with an The spray nozzle, fuel channels, etc. and the function of the injector will be explained in more detail in a later chapter.
- the actuator unit 2 has a piezoelectric actuator 8, which is constructed from a piezoceramic with a large number of individual layers using PMA technology (piezoelectric multilayer actuator) in order to generate the largest possible stroke.
- the actuator is controlled with a pulsed control voltage, for example 160V, and changes its length in the axial direction in accordance with the applied control pulses. Its upper end is firmly connected to the housing 1 of the injector (not shown in FIG. 1), so that the change in length when the control voltage is applied to the actuator 8 can have a full downward effect.
- the lower end of the actuator 8 is fixedly connected to a coupling element or base plate 2a, which is formed with a recess or bore and can receive the upper part of a crank pin 3.
- the coupling element and the crank pin 3 are matched to one another in such a way that the crank pin 3 completely retraces each movement of the actuator 8.
- the change in length of the actuator 8 can thus be tapped off at the lower end of the crank pin 3 and can be used to control a servo valve (not shown in the figure) or a nozzle needle.
- a leakage space 6 is arranged, in which the fuel is stored under a high pressure. Depending on the application, the pressure can be several hundred or more than a thousand bar.
- the crank pin 3 partially projects into this leakage space 6.
- a sealing ring which essentially has a plastic ring 4 and a metal ring 5.
- the plastic ring 4 has a central bore through which the crank pin 3 is passed.
- the plastic ring 4 is with the crank pin 3 is firmly connected to the crank pin 3, for example by vulcanizing or gluing, so that no fuel can penetrate.
- the plastic ring 4 is preferably disc-shaped, and has no inaccessible corners or edges on which solid particles can accumulate, which are produced, for example, by post-processing such as grinding.
- a polymer type is provided as the material for the plastic ring 4, which is flexible or elastic and sufficiently resistant to aggressive fuels. Furthermore, the plastic ring 4 must have such flexible properties that are suitable against the prevailing pressure, occurring temperatures, etc., and allow a centered axial guidance of the crank pin 3.
- the plastic ring 4 is encased by a metal ring 5 corresponding shape because of the better handling during assembly and is also firmly connected to this by vulcanizing or gluing.
- the dimensions of the metal ring 5 correspond to the opening width of the bore in the housing 1 into which the metal ring 5 is to be inserted.
- the metal ring 5 is preferably pressed into the bore and thereby fixed in such a way that it seals the leakage space 6 against leaking fuel with respect to the actuator unit 2.
- the metal ring 5 is preferably pressed so deep into the bore that the lower end of the crank pin 3 is flush with a sealing surface 7 of the housing 1, which is used as a reference surface when pressed in. This ensures that the crank pin 3 functions reliably. In order to achieve this goal, the crank pin 3 can be re-ground after assembly until it is flush with the reference surface 7 of the housing 1. After the grinding process, the residues can be easily rinsed out because of the advantageous embodiment of the invention. Alternatively, it is also provided that the metal ring 5 is pressed in with an insertion depth which leads to a predetermined preload for the plastic ring 4.
- FIG. 2 shows a schematic representation of a longitudinal section through the aforementioned injector 20 for fuel injection into an internal combustion engine of a motor vehicle.
- the injector 20 has an injector housing 1, into which the piezoelectric actuator 8 or the actuator unit 2, which is preferably constructed using multilayer technology, is inserted.
- the upper part of the piezoelectric actuator 8 (head plate 16) is firmly connected to the upper part of the injector housing 1.
- the lower end of the actuator unit 2 is closed with a base plate 2a.
- the base plate 2a is arranged to be movable along the longitudinal axis and moves downward relative to the housing 1 when a corresponding control voltage is applied to the piezoelectric actuator 8.
- the piezoelectric actuator 8 is encased by a tubular spring 13 which, among other things, supports the reversible movement of the actuator 8 into its starting position when the control voltage is switched off.
- a cutout (central bore) is made in the base plate 2a, which serves to receive the crank pin 3.
- the crank pin 3 is centered and guided by a plastic ring 4.
- the plastic ring 4 is encased by a metal ring 5, which is designed as a sealing ring and seals a leakage space 6 towards the injector 8.
- Position 7 symbolizes the sealing surface between the two parts of the injector housing 1.
- a hydraulic or mechanical translator 15, on which the crank pin 3 can act, is arranged below the crank pin 3.
- the translator 15 is preferably designed as a stroke reverser. It moves its lower part upwards when the actuator 8 extends downwards. In the non-activated state of the actuator 8, the stroke reverser 15 presses one Ram 17 on a servo valve 18 so that it closes a control chamber 9 located below. Due to the pressure conditions in the control chamber 9 and the corresponding dimensioning of the nozzle needle 10, the nozzle needle 10 is pressed against injection openings 14 in the nozzle housing and closes the injection openings 14.
- a corresponding line 11 for supplying the fuel is arranged in the control chamber 9. In addition, the line 11 is led to an injection space 21, which is arranged above the sealing seat of the nozzle needle 10.
- the actuator 8 If the actuator 8 is activated by applying a control voltage, it expands and presses on the stroke reverser 15. This opens the servo valve 18, so that the fuel under pressure can partially flow off via an outlet 12. The fuel, which is under higher pressure at the lower end of the nozzle needle 10, lifts the nozzle needle 10 so that the fuel can escape from the injection openings 14.
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)
- Manufacturing & Machinery (AREA)
- Fuel-Injection Apparatus (AREA)
Abstract
Description
Claims
Applications Claiming Priority (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE10260289 | 2002-12-20 | ||
DE2002160289 DE10260289A1 (en) | 2002-12-20 | 2002-12-20 | Injector with a device for sealing an actuator unit and a sealing ring |
PCT/DE2003/004150 WO2004057179A1 (en) | 2002-12-20 | 2003-12-16 | Injector comprising a device for sealing an actuator unit, and sealing ring |
Publications (2)
Publication Number | Publication Date |
---|---|
EP1573196A1 true EP1573196A1 (en) | 2005-09-14 |
EP1573196B1 EP1573196B1 (en) | 2008-04-09 |
Family
ID=32477890
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP03813532A Expired - Lifetime EP1573196B1 (en) | 2002-12-20 | 2003-12-16 | Injector comprising a device for sealing an actuator unit, and sealing ring |
Country Status (3)
Country | Link |
---|---|
EP (1) | EP1573196B1 (en) |
DE (2) | DE10260289A1 (en) |
WO (1) | WO2004057179A1 (en) |
Families Citing this family (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP1808596A1 (en) | 2006-01-12 | 2007-07-18 | Siemens Aktiengesellschaft | Valve assembly for an injection valve and injection valve |
DE502007002482D1 (en) | 2007-03-15 | 2010-02-11 | Ford Global Tech Llc | injector |
DE102011084107A1 (en) | 2011-10-06 | 2013-04-11 | Continental Automotive Gmbh | Piezoelectric actuator |
DE102014207378B4 (en) * | 2014-04-17 | 2017-08-10 | Continental Automotive Gmbh | Injection valve device for a high pressure system |
Family Cites Families (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE3742241A1 (en) * | 1987-02-14 | 1988-08-25 | Daimler Benz Ag | Piezocontrol valve for controlling fuel injection via an injection valve in internal combustion engines |
DE19946603B4 (en) * | 1999-09-29 | 2009-01-15 | Robert Bosch Gmbh | Fuel injection valve with compensating sealing elements |
DE10004810A1 (en) * | 2000-02-04 | 2001-08-16 | Bosch Gmbh Robert | Hydraulic stroke translation system |
-
2002
- 2002-12-20 DE DE2002160289 patent/DE10260289A1/en not_active Ceased
-
2003
- 2003-12-16 WO PCT/DE2003/004150 patent/WO2004057179A1/en active IP Right Grant
- 2003-12-16 DE DE50309597T patent/DE50309597D1/en not_active Expired - Lifetime
- 2003-12-16 EP EP03813532A patent/EP1573196B1/en not_active Expired - Lifetime
Non-Patent Citations (1)
Title |
---|
See references of WO2004057179A1 * |
Also Published As
Publication number | Publication date |
---|---|
DE10260289A1 (en) | 2004-07-08 |
EP1573196B1 (en) | 2008-04-09 |
WO2004057179A1 (en) | 2004-07-08 |
DE50309597D1 (en) | 2008-05-21 |
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