EP1356203A1 - Vorrichtung zur kraftstoff-hochdruckversorgung einer brennkraftmaschine - Google Patents
Vorrichtung zur kraftstoff-hochdruckversorgung einer brennkraftmaschineInfo
- Publication number
- EP1356203A1 EP1356203A1 EP01991686A EP01991686A EP1356203A1 EP 1356203 A1 EP1356203 A1 EP 1356203A1 EP 01991686 A EP01991686 A EP 01991686A EP 01991686 A EP01991686 A EP 01991686A EP 1356203 A1 EP1356203 A1 EP 1356203A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- piston
- shaped element
- recesses
- pressure
- section
- 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
- 239000000446 fuel Substances 0.000 title claims abstract description 51
- 238000002485 combustion reaction Methods 0.000 title claims abstract description 29
- 238000007789 sealing Methods 0.000 claims abstract description 23
- 238000002347 injection Methods 0.000 claims description 23
- 239000007924 injection Substances 0.000 claims description 23
- 238000006073 displacement reaction Methods 0.000 description 2
- 230000001050 lubricating effect Effects 0.000 description 2
- 230000015572 biosynthetic process Effects 0.000 description 1
- 238000005461 lubrication Methods 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 230000006641 stabilisation Effects 0.000 description 1
- 238000011105 stabilization Methods 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
- F02M61/04—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
Definitions
- the invention is based on a device for supplying high-pressure fuel to an internal combustion engine, as corresponds to the preamble of patent claim 1.
- a device for supplying high-pressure fuel to an internal combustion engine, as corresponds to the preamble of patent claim 1.
- Such a device is known in the form of a fuel injection valve, for example from the published patent application DE 198 43 344 AI.
- a bore is formed in a valve body, in which a piston-shaped valve member is arranged to be longitudinally displaceable.
- the valve member has a sealing section with which it is guided in a guide section of the bore, so that only an extremely small annular gap remains in this area between the valve member and the inner wall of the bore, which is just large enough to accommodate the longitudinal displacement. ensure sliding of the valve member.
- a pressure chamber formed by a radial expansion of the bore connects to the guide area, which pressure chamber can be filled with fuel under high pressure.
- the pressure chamber continues towards the combustion chamber as an annular channel surrounding the valve member and is delimited at the end on the combustion chamber side by a valve sealing surface which closes off the bore towards the combustion chamber.
- the valve member has a valve sealing surface which interacts with the valve seat for controlling at least one injection opening, so that the injection opening can be connected to the pressure chamber by the longitudinal movement of the valve member.
- a leakage oil space connects to it, which is constantly kept at a low pressure level by a corresponding leakage oil connection. Since a very high fuel pressure is present in the pressure chamber at least during the injection, there is a high pressure difference between the two ends of the guide section of the bore. As a result, fuel is pressed from the pressure chamber into the leakage oil chamber through the annular gap, which remains because of the longitudinal displacement between the sealing section of the valve member and the guide section of the bore. Especially in the case of fuels such as those used for self-igniting internal combustion engines, the fuel in this area also serves to lubricate the valve member in the bore.
- the device according to the invention for supplying high-pressure fuel to an internal combustion engine has the advantage, in contrast, that recesses are formed on the guide section of the piston-shaped element guided in the bore, which are hydraulically connected to the pressure chamber, but do not extend into the leakage oil chamber.
- the recesses are preferably designed as grooves which lead from the high pressure area, that is to say the pressure chamber, to a certain height of the sealing section, but not to the low pressure area.
- the structure of the recesses not only prevents the pressure drop behind the narrowest point of the annular channel formed between the piston-shaped element and the bore, but also builds up a higher pressure compared to the opposite side. This pressure build-up causes the valve member to experience a force which is directed away from the inner wall surface of the bore and thus centers the piston-shaped element in the bore again.
- the recesses are arranged distributed uniformly over the circumference of the piston-shaped element, so as to connect each region of the circumference of the piston-shaped element to the pressure chamber via a recess.
- the cross section of the recesses must be chosen to be very small.
- a depth of 1 to 50 ⁇ m is provided, preferably 2 to 10 ⁇ m.
- the width can vary between 100 and 500 ⁇ m.
- the design of the recesses according to the invention is particularly advantageous if the device is a fuel injection valve and the piston-shaped element is a valve member. Due to the high fuel pressures in such fuel injection valves, as are preferably used for self-igniting internal combustion engines, an exact alignment of the valve member in the bore is particularly important in order to ensure trouble-free operation over the service life.
- FIG. 1 shows a longitudinal section through a fuel injection valve
- FIGS. 2, 3, 4 and 5 show enlargements in the guide region of the valve member.
- Figure 1 is a longitudinal section through a device for
- a component designed as a valve body 1 has a bore 3 in which a piston-shaped element, which is designed here as a valve member 5, is longitudinally displaceable. bar is arranged.
- the valve member 5 has a longitudinal axis 6 and is sealingly guided with a sealing section 105 in a guide section 103 of the bore 3 facing away from the combustion chamber. Starting from the sealing section 105 of the valve member 5, the valve member 5 tapers towards the combustion chamber to form a pressure shoulder 13 and thus merges into a valve member shaft 205 with a reduced diameter.
- a valve sealing surface 7 is formed, which is at least approximately conical and cooperates with a valve seat 9 formed at the combustion chamber end of the bore 3.
- At least one injection opening 11 is formed in the valve seat 9, which connects the bore 3 to the combustion chamber of the internal combustion engine.
- a radial expansion of the bore 3 in the valve body 1 forms a pressure chamber 19 which extends as an annular channel surrounding the valve member stem 205 as far as the valve seat 9.
- the pressure chamber 19 can be connected via an inlet channel 25 running in the valve body 1 to a high-pressure fuel source (not shown in the drawing) and can be filled with fuel under high pressure.
- valve body 1 facing away from the combustion chamber rests on a valve holding body 2 and is braced against the latter in the axial direction by a tensioning device (not shown in the drawing). It can also be provided that the valve body 1 and the valve holding body 2 are formed in one piece.
- a leak oil chamber 15 is formed, into which the bore 3 opens and which is constantly relieved of pressure via a leak oil channel, not shown in the drawing, so that there is always a low fuel pressure in the leak oil chamber 15.
- a closing device Arranged in the leakage oil chamber 15 is a closing device, not shown in the drawing, which exerts a closing force F on the valve member 5, the closing force F acting on the valve seat 9. is aimed.
- the direction of the closing force F is indicated in the drawing by an arrow.
- the function of the fuel injection valve when fuel is injected into the combustion chamber of the internal combustion engine is as follows, whereby two operating modes can be distinguished: In the first operating mode, a high fuel pressure in the pressure chamber 19 is constantly maintained by the high-pressure fuel source via the inlet channel 25. This results in a hydraulic force on the pressure shoulder 13, which is directed against the closing force F. If no injection is to take place, the closing force F is chosen to be correspondingly high, so that the valve member 5 rests with its valve sealing surface 7 on the valve seat 9. If an injection is to take place, the closing force F is reduced so that the hydraulic force on the pressure shoulder 13 now predominates and the valve member 5 is moved in the direction of the leak oil chamber 15.
- valve sealing surface 7 lifts off the valve seat 9 and fuel is injected from the pressure chamber 19 through the injection opening 11 into the combustion chamber of the internal combustion engine.
- the injection is ended again by a corresponding increase in the closing force F and the valve member 5 returns to its original position by a longitudinal movement.
- an at least approximately constant closing force is exerted on the valve member 5, and the movement of the valve member 5 takes place through a variable fuel pressure in the pressure chamber 19. If no injection is to take place, the fuel chamber 19 has a low fuel pressure so that the hydraulic force on the pressure shoulder 13 is less than the closing force F. If an injection is to take place, fuel is introduced into the pressure chamber 19 via the inlet channel 25, as a result of which the fuel pressure rises there.
- the valve member 5 moves in the longitudinal direction and, as in the first operating mode, also lifts the valve sealing surface 7 from the valve seat 9, and the injection takes place as described in the first operating mode.
- the end of the injection is initiated in that the fuel supply through the inlet channel 25 is interrupted, as a result of which the fuel pressure in the pressure chamber 19 drops and thus also the hydraulic force on the pressure shoulder 13. Due to the closing force F, the valve member 5 returns to the starting position and closes the injection opening 11.
- FIG. 2 shows an enlarged illustration in the region of the guide section 103 of the bore 3. So that the valve member 5 is longitudinally displaceable in the bore 3, it must have some play there, so that an annular gap 17 is formed between the sealing portion 105 of the valve member 5 and the guide portion 103 of the bore 3.
- fuel constantly flows from the pressure chamber 19 into the ring-shaped throttle gap
- the pressure in the annular gap 17 drops at least approximately linearly from the high-pressure chamber 19 to the leakage oil chamber 15. If one takes into account the groove-shaped recesses 30, as shown in FIG. 2, there is another state: The contact side of the valve member 5 opposite flows through the enlarged annular gap 17 there, the main part of the leak oil past the valve member 5. In this area, the groove-shaped recesses 30 play practically no role for the pressure profile in the annular gap 17, so that there is still a linear pressure drop here. On the other hand, on the contact side of the valve member 5 on the inner wall of the guide section 103 of the bore 3, the annular gap 17 is reduced, so that only a small fuel flow takes place in this area.
- the recesses 30 are hydraulically connected to the pressure chamber 19 in this area, the high fuel pressure of the pressure chamber 19 continues into the recesses 30, so that essentially the pressure of the pressure chamber 19 prevails in the entire recesses 30, or at least a significantly higher pressure than at the same height on the opposite side of the annular gap 17.
- This pressure distribution results in a resulting force on the valve member 5, which pushes it back into the center of the bore 3, so that the valve member 5 in the central position the bore 3 remains in a stable equilibrium.
- Figure 3 shows the same section as Figure 2 of another fuel injection valve according to the invention.
- the recesses 30 are designed here as longitudinal grooves inclined to the longitudinal axis 6, so that they have a helical course.
- Another embodiment is shown in Figure 4.
- the recesses 30 are shown as meandering grooves which extend to approximately two thirds of the length of the sealing section 105 of the valve member 5.
- a further exemplary embodiment is shown in FIG. 5, in which the recesses 30 are formed by piece-wise straight grooves which are hydraulically connected to one another. This results in labyrinth-like structures on the surface of the valve member 5, which distribute the fuel evenly over the Ensure the circumference of the valve member 5 without there being a preferred direction.
- FIGS. 2, 3, 4 and 5 unfold their respective advantages only in the overall geometry of the fuel injector. Which configuration, depth and cross-sectional shape is particularly advantageous must be determined in each individual case by experimenting or simulating the flow profile.
- the cross section of the recesses 30 must be kept relatively small.
- the recesses 30 have a depth of 1 to 50 ⁇ m, preferably 2 to 10 ⁇ m.
- the width of the groove-shaped recesses 30 is preferably 100 to 500 ⁇ m, it being possible for the cross-sectional shape of the recesses to be, for example, rectangular, segmental, triangular or u-shaped.
- the recesses extend, starting from the end of the sealing section 105 facing the combustion chamber, about half to about three quarters the length of the sealing section 105. In this way, the leakage oil flow that flows through the recesses 30 and from there through the annular gap 17 to in the leak oil chamber 15, kept within reasonable limits.
- the recesses 30 according to the invention are not formed on the piston-shaped element 5, but rather on the inner wall of the bore 3. Hydraulically, this results in a situation comparable to the formation of the recesses 30 on the Outer surface of the piston-shaped element 5.
Landscapes
- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Fuel-Injection Apparatus (AREA)
Abstract
Description
Claims
Applications Claiming Priority (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE10102234A DE10102234A1 (de) | 2001-01-19 | 2001-01-19 | Vorrichtung zur Kraftstoff-Hochdruckversorgung einer Brennkraftmaschine |
DE10102234 | 2001-01-19 | ||
PCT/DE2001/004915 WO2002064969A1 (de) | 2001-01-19 | 2001-12-22 | Vorrichtung zur kraftstoff-hochdruckversorgung einer brennkraftmaschine |
Publications (2)
Publication Number | Publication Date |
---|---|
EP1356203A1 true EP1356203A1 (de) | 2003-10-29 |
EP1356203B1 EP1356203B1 (de) | 2011-09-28 |
Family
ID=7671029
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP01991686A Expired - Lifetime EP1356203B1 (de) | 2001-01-19 | 2001-12-22 | Vorrichtung zur kraftstoff-hochdruckversorgung einer brennkraftmaschine |
Country Status (6)
Country | Link |
---|---|
US (1) | US7011256B2 (de) |
EP (1) | EP1356203B1 (de) |
JP (1) | JP2004518076A (de) |
DE (1) | DE10102234A1 (de) |
PL (1) | PL357212A1 (de) |
WO (1) | WO2002064969A1 (de) |
Families Citing this family (10)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE10245573A1 (de) * | 2002-09-27 | 2004-04-08 | Robert Bosch Gmbh | Kraftstoffeinspritzventil für Brennkraftmaschinen |
JP4007202B2 (ja) * | 2003-01-23 | 2007-11-14 | 株式会社デンソー | 軸部材の摺動構造およびインジェクタ |
JP4119812B2 (ja) * | 2003-09-19 | 2008-07-16 | ボッシュ株式会社 | 燃料噴射弁 |
JP4066959B2 (ja) * | 2004-01-27 | 2008-03-26 | 株式会社デンソー | 燃料噴射装置 |
JP2008057458A (ja) * | 2006-08-31 | 2008-03-13 | Mitsubishi Heavy Ind Ltd | 燃料噴射弁 |
DE102012223334A1 (de) * | 2012-12-17 | 2014-06-18 | Robert Bosch Gmbh | Kolbenzylindereinheit |
DE102014218179A1 (de) | 2014-09-11 | 2016-03-17 | Robert Bosch Gmbh | Axialkolbenmaschine und Verwendung einer Axialkolbenmaschine |
DE102015211705A1 (de) * | 2015-06-24 | 2016-12-29 | Robert Bosch Gmbh | Kraftstoffinjektor mit Steuerventil |
DE102015226326A1 (de) * | 2015-12-21 | 2017-06-22 | Robert Bosch Gmbh | Hydraulische Kopplereinrichtung und Kraftstoffeinspritzventil mit einer solchen |
DE102017115613A1 (de) * | 2017-07-12 | 2019-01-17 | L'orange Gmbh | Kraftstoffinjektor und Einspritzsystem für eine Brennkraftmaschine |
Family Cites Families (7)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE3433710A1 (de) | 1984-09-14 | 1986-03-27 | Robert Bosch Gmbh, 7000 Stuttgart | Elektrisch gesteuerte pumpeduese fuer die kraftstoffeinspritzung bei dieselbrennkraftmaschinen |
DE19820264A1 (de) * | 1998-05-07 | 1999-11-11 | Mtu Friedrichshafen Gmbh | Hochdruck-Kolbenzylindereinheit |
GB9819746D0 (en) * | 1998-09-11 | 1998-11-04 | Lucas Ind Plc | Fuel injector |
DE19843344A1 (de) * | 1998-09-22 | 2000-03-23 | Bosch Gmbh Robert | Kraftstoffeinspritzventil für Brennkraftmaschinen |
US6776358B2 (en) * | 1998-10-09 | 2004-08-17 | Jun Arimoto | Fuel injection nozzle for a diesel engine |
WO2000022295A1 (fr) * | 1998-10-09 | 2000-04-20 | Jun Arimoto | Valve d'injection de carburant pour moteur diesel |
GB9904938D0 (en) * | 1999-03-04 | 1999-04-28 | Lucas Ind Plc | Fuel injector |
-
2001
- 2001-01-19 DE DE10102234A patent/DE10102234A1/de not_active Withdrawn
- 2001-12-22 WO PCT/DE2001/004915 patent/WO2002064969A1/de active Application Filing
- 2001-12-22 EP EP01991686A patent/EP1356203B1/de not_active Expired - Lifetime
- 2001-12-22 US US10/239,081 patent/US7011256B2/en not_active Expired - Fee Related
- 2001-12-22 PL PL01357212A patent/PL357212A1/xx not_active Application Discontinuation
- 2001-12-22 JP JP2002564260A patent/JP2004518076A/ja active Pending
Non-Patent Citations (1)
Title |
---|
See references of WO02064969A1 * |
Also Published As
Publication number | Publication date |
---|---|
US7011256B2 (en) | 2006-03-14 |
WO2002064969A1 (de) | 2002-08-22 |
DE10102234A1 (de) | 2002-07-25 |
JP2004518076A (ja) | 2004-06-17 |
US20040124286A1 (en) | 2004-07-01 |
EP1356203B1 (de) | 2011-09-28 |
PL357212A1 (en) | 2004-07-26 |
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