WO1998053196A1 - Pumpedüse - Google Patents
Pumpedüse Download PDFInfo
- Publication number
- WO1998053196A1 WO1998053196A1 PCT/EP1998/002917 EP9802917W WO9853196A1 WO 1998053196 A1 WO1998053196 A1 WO 1998053196A1 EP 9802917 W EP9802917 W EP 9802917W WO 9853196 A1 WO9853196 A1 WO 9853196A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- pump
- compression spring
- nozzle
- pump nozzle
- nozzle according
- 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
- F02M59/00—Pumps specially adapted for fuel-injection and not provided for in groups F02M39/00 -F02M57/00, e.g. rotary cylinder-block type of pumps
- F02M59/44—Details, components parts, or accessories not provided for in, or of interest apart from, the apparatus of groups F02M59/02 - F02M59/42; Pumps having transducers, e.g. to measure displacement of pump rack or piston
- F02M59/48—Assembling; Disassembling; Replacing
-
- 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
-
- 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
- F02M57/00—Fuel-injectors combined or associated with other devices
- F02M57/02—Injectors structurally combined with fuel-injection pumps
- F02M57/022—Injectors structurally combined with fuel-injection pumps characterised by the pump drive
- F02M57/023—Injectors structurally combined with fuel-injection pumps characterised by the pump drive 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
- F02M59/00—Pumps specially adapted for fuel-injection and not provided for in groups F02M39/00 -F02M57/00, e.g. rotary cylinder-block type of pumps
- F02M59/02—Pumps specially adapted for fuel-injection and not provided for in groups F02M39/00 -F02M57/00, e.g. rotary cylinder-block type of pumps of reciprocating-piston or reciprocating-cylinder type
- F02M59/10—Pumps specially adapted for fuel-injection and not provided for in groups F02M39/00 -F02M57/00, e.g. rotary cylinder-block type of pumps of reciprocating-piston or reciprocating-cylinder type characterised by the piston-drive
- F02M59/102—Mechanical drive, e.g. tappets or cams
-
- 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
- F02M59/00—Pumps specially adapted for fuel-injection and not provided for in groups F02M39/00 -F02M57/00, e.g. rotary cylinder-block type of pumps
- F02M59/20—Varying fuel delivery in quantity or timing
- F02M59/24—Varying fuel delivery in quantity or timing with constant-length-stroke pistons having variable effective portion of stroke
- F02M59/26—Varying fuel delivery in quantity or timing with constant-length-stroke pistons having variable effective portion of stroke caused by movements of pistons relative to their cylinders
- F02M59/28—Mechanisms therefor
-
- 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
- F02M59/00—Pumps specially adapted for fuel-injection and not provided for in groups F02M39/00 -F02M57/00, e.g. rotary cylinder-block type of pumps
- F02M59/44—Details, components parts, or accessories not provided for in, or of interest apart from, the apparatus of groups F02M59/02 - F02M59/42; Pumps having transducers, e.g. to measure displacement of pump rack or piston
-
- 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
Definitions
- the invention relates to a pump nozzle for injecting fuel into an internal combustion engine, in particular a single-cylinder diesel engine, which has a piston foot, a pump cylinder, a pump piston, an intermediate disk and an injection nozzle with compression spring, compression spring plate and nozzle needle.
- Conventional injection systems consist of an injection pump, the outlets of which are connected to several injection nozzles via pressure lines.
- the pressure lines have physical properties that limit performance, since under the conditions prevailing in high-pressure injection systems, the fuel can no longer be regarded as a rigid, incompressible liquid and the processes during the injections are carried out according to laws that are similar to those of acoustics.
- the pressure line thus acts as a "harmful" volume in the system, since it limits the peak pressure values that can be achieved and the dynamics of the pressure line make it difficult to control the injection processes (post-injection, cavitation).
- pump nozzles have been used for a long time.
- the injection pump and injector form one unit.
- One pump nozzle is installed in the cylinder head for each cylinder and is driven by the camshaft either directly via a piston foot or indirectly via rocker arm.
- the control can be done either via a common control rod in the cylinder head similar to an in-line injection pump or by an alternative low-pressure metering pump.
- the overflow bore which is controlled with the sloping edge in in-line injection pumps for quantity control, is operated via a fast-switching high-pressure solenoid valve. As long as the solenoid valve is closed, the pump nozzle delivers.
- DE 4127003 AI discloses a generic, electrically controlled pump nozzle for fuel injection devices in internal combustion engines.
- the pump nozzle described there has a pump housing which contains a pump cylinder in which a pump piston which delimits a pump working space and is driven with a constant stroke is guided.
- a holding body, on which a nozzle body is located, is arranged in the extension of its central axis.
- DE-AS 1126678 proposes a pump nozzle in which a plate spring is provided as a pressure valve spring to reduce the area of the injection housing heated by the fuel gases and to reduce the housing diameter.
- a plate spring is provided as a pressure valve spring to reduce the area of the injection housing heated by the fuel gases and to reduce the housing diameter.
- this solution has the disadvantage that the spring pressure is not adjustable and the use of commercially available pump components to reduce costs is excluded.
- the pump nozzle according to the invention is constructed in such a way that a pump piston foot is connected to a pump piston which is received in a pump cylinder.
- An intermediate disk and an adjoining nozzle needle form the nozzle with a nozzle body.
- a compression spring is arranged laterally to the nozzle needle axis as a nozzle needle closing spring. This results in a compact design with a very short overall length.
- the compression spring is arranged next to the pump cylinder.
- the compression spring can be designed as a helical spring, the axis of which runs parallel to the nozzle needle axis.
- a further development of the invention provides that the nozzle needle is acted upon by the spring pressure of the prestressed compression spring via a deflection lever.
- the bell crank each has a joint or a lever support point on the intermediate disk, the nozzle needle and the compression spring plate.
- the opening pressure must be so great that it overcomes the spring pressure exerted by the compression spring on the deflection lever on the nozzle needle and counteracts this. The further the nozzle needle lifts out of its nozzle seat, the more it becomes the compression spring compressed.
- the closing pressure is reached, the nozzle needle is pressed into the nozzle opening in a sealing manner by the compression spring via the deflection lever, and the injection nozzle is thus closed.
- the intermediate disk advantageously has a longitudinal groove for receiving the bellcrank. As a result, the overall length can be shortened further.
- a piston vane between the piston foot and the pump piston and a regulating sleeve are provided for the mechanical regulation of the injection quantity.
- the fuel is metered according to the overflow principle with inclined edges, the useful stroke of the pump element being varied by twisting.
- the control sleeve is advantageously designed as a profiled sheet metal sleeve with a control arm.
- the control sleeve can consist of a polygonal profile, which gives the piston lug sufficient play for axial up and down movement, but which ensures the rotation of the pump piston and thus the longitudinal groove via the riveted or spot-welded control link.
- an expensive and complex control rack which engages in a sealing gear wheel attached to the piston, can be dispensed with.
- Another advantageous embodiment provides that an upstream solenoid valve is arranged for electronic injection control. This allows the injection quantity and the start of injection can be regulated in a simple manner by one component.
- the piston foot is connected to a drive element by a driver.
- a driver By fastening the driver on the side of the drive element, e.g. a drive cam or rocker arm, and the possibility of connecting the driver to the piston end by simply pivoting the driver results in a particularly simple assembly of the injection pump on the engine.
- the driver After the piston foot with its widened footplate is brought into the contact position on the drive element, the driver is simply pivoted over the footplate so that it engages over the rear of the footplate and prevents it from being lifted off the drive element when the engine is operating.
- the expensive piston spring that is customary in conventional injection pumps can be completely replaced.
- an advantageous embodiment of the present invention provides that the compression spring chamber is designed as a fuel supply. This multiple function also results in a cost-saving, compact design.
- FIG. 1 shows a section through an embodiment of the pump nozzle according to the invention.
- Fig. 1 shows an advantageous embodiment of the pump nozzle 1 according to the invention with a driver 2. This is connected to a piston foot 3 of a pump piston 7 with a drive element, not shown. At the piston foot 3 there is a piston vane 4, which is accommodated in a profiled control sleeve 5 with a control arm 6 so that it can move freely axially.
- the pump piston 7 is arranged in a pump cylinder 8, which in turn is accommodated in a pump nozzle housing 9.
- the pump nozzle housing 9 is sealed on one side by a cover 10, a sealing cord 11 and screws 12.
- the pump nozzle housing 9 also has a compression spring chamber 13 with a compression spring 14 and a compression spring plate 15.
- an intermediate disk 16 is arranged in the pump nozzle housing 9, which has a groove for receiving a bell crank 17.
- the deflection lever 17 is supported on a joint 18 serving as a support point on the intermediate disk 16 and rests on the nozzle needle 20 with a further joint 19.
- a third joint 21 serves as a point of contact with the compression spring plate 15 of the compression spring 14.
- the nozzle needle 20 is guided in the nozzle body 22.
- the pressure channel 23 is shown, which leads through the washer into the nozzle body 22.
- a dowel pin 24 is shown, which is used to position the washer 16 on the nozzle body 22.
- the pump nozzle housing 9 has a recess 25 which on the one hand opens into the compression spring chamber 13 and on the other hand through the bores 26, 27 with the interior of the Pump cylinder 8 is connected.
- An adjustment eccentric 50 serves to turn the element cylinder relative to the pump nozzle housing 9 and thus to fine-tune the injection quantity.
- An annular seal 51 provides the high-pressure seal of the pump cylinder 8 with respect to the intermediate disk 16.
- FIG. 2 shows a further section through the pump nozzle, viewed from arrow direction A in FIG. 1.
- this also includes a further dowel pin 28 for positioning the intermediate disk 16 on the nozzle body 22 and the fuel line 29 recognizable.
- the fuel line 29 is connected to the cover 10 and has an overlap with the compression spring chamber 13 (cf. FIG. 3).
- FIG. 3 shows a schematic top view of the pump nozzle according to FIG. 1.
- Three different control handle positions 30, 31 and 32 are shown in broken lines. Furthermore, the geometric design of the driver 2 is shown. The overlap between the fuel line 29 indicated by dashed lines and the compression spring chamber 13 also indicated by dashed lines can be seen.
- FIG. 4 shows a section along the line IV-IV from FIG. 1 with the control handle positions 30, 31 and 32 indicated by dashed lines. Furthermore, the bell crank 17 and the cord seal 11 are shown. The position of the dowel pins 24, 28 and the pressure channel 23 in the washer 16 can be clearly seen.
- the cut of the line IV-IV is a staggered cut and runs through the cord seal 11, then down and cuts the washer 16 there, but not the lever 17 used therein.
- the compression spring 14 and the compression spring plate 15 have been removed for the sake of clarity.
- the fuel passes through the fuel line 29 into the compression spring chamber 13, which also acts as a suction chamber, and thus into the annular chamber 25, from where it reaches the interior of the pump cylinder 8 through the bores 26 and 27.
- a drive element e.g. a cam
- the piston foot 3 and thus the pump piston 7 is axially displaced from the bottom towards the intermediate plate 16 and thus towards the top.
- the piston vane 4 moves axially within the control sleeve 5 during this process.
- the pressure in the pressure channel 23 increases until it is greater than the spring pressure exerted on the nozzle needle by the deflection lever 17.
- the nozzle needle lifts off its seat and the fuel exits through the released spray holes of the nozzle tip.
- the spring 14 is further compressed.
- the pressure in the pressure channel 23 collapses at the moment when the suction bore 26 is released through the control edge of the pump piston 7 and the fuel can escape through the compression spring chamber into the fuel line, i.e. when a connection between high pressure and low pressure area is established.
- the bell crank 17 is guided in a longitudinal groove 52 which is arranged in the intermediate disk 16.
- the piston vane 4 is rotated in the circumferential direction by the control sleeve 5, as a result of which the control edge, not shown, is also rotated relative to the suction bore 26 for the purpose of changing the injection quantity.
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
Priority Applications (4)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US09/214,472 US6202940B1 (en) | 1997-05-21 | 1998-05-18 | Pump nozzle |
EP98928289A EP0914554B1 (de) | 1997-05-21 | 1998-05-18 | Pumpendüse |
DE59806428T DE59806428D1 (de) | 1997-05-21 | 1998-05-18 | Pumpendüse |
JP10549938A JP2000515609A (ja) | 1997-05-21 | 1998-05-18 | ポンプノズル |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE19721241.7 | 1997-05-21 | ||
DE19721241A DE19721241C1 (de) | 1997-05-21 | 1997-05-21 | Pumpedüse |
Publications (1)
Publication Number | Publication Date |
---|---|
WO1998053196A1 true WO1998053196A1 (de) | 1998-11-26 |
Family
ID=7830079
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/EP1998/002917 WO1998053196A1 (de) | 1997-05-21 | 1998-05-18 | Pumpedüse |
Country Status (6)
Country | Link |
---|---|
US (1) | US6202940B1 (de) |
EP (1) | EP0914554B1 (de) |
JP (1) | JP2000515609A (de) |
CN (1) | CN1083936C (de) |
DE (2) | DE19721241C1 (de) |
WO (1) | WO1998053196A1 (de) |
Families Citing this family (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE10326707B3 (de) * | 2003-06-11 | 2005-01-27 | Westport Germany Gmbh | Ventilvorrichtung und Verfahren zum Einblasen von gasförmigem Kraftstoff |
WO2006008728A1 (en) * | 2004-07-20 | 2006-01-26 | Mazrek Ltd. | Needle-spring locking device for pump-injector (injector) for internal combustion engines |
CN114992023B (zh) * | 2022-06-09 | 2023-09-26 | 北京航空航天大学 | 一种适应负碳生物燃料的航空发动机喷油控制方法 |
Citations (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE1126678B (de) | 1955-08-02 | 1962-03-29 | Max Mangl | Aus Pumpe und Duese zusammengefasstes Brennstoffeinspritzgeraet fuer Brennkraftkolbenmaschinen |
US4650116A (en) * | 1983-08-31 | 1987-03-17 | L'orange Gmbh | Fuel-injection device |
GB2226078A (en) * | 1988-11-09 | 1990-06-20 | Lucas Ind Plc | C.i. engine fuel injection nozzle |
DE4127003A1 (de) | 1991-08-16 | 1993-02-18 | Bosch Gmbh Robert | Elektrisch gesteuerte pumpeduese fuer kraftstoffeinspritzvorrichtungen in brennkraftmaschinen |
US5326034A (en) * | 1993-07-27 | 1994-07-05 | Cummins Engine Company, Inc. | Compact closed nozzle assembly for a fuel injector |
-
1997
- 1997-05-21 DE DE19721241A patent/DE19721241C1/de not_active Expired - Fee Related
-
1998
- 1998-05-18 JP JP10549938A patent/JP2000515609A/ja not_active Ceased
- 1998-05-18 EP EP98928289A patent/EP0914554B1/de not_active Expired - Lifetime
- 1998-05-18 DE DE59806428T patent/DE59806428D1/de not_active Expired - Fee Related
- 1998-05-18 CN CN98800668A patent/CN1083936C/zh not_active Expired - Fee Related
- 1998-05-18 US US09/214,472 patent/US6202940B1/en not_active Expired - Fee Related
- 1998-05-18 WO PCT/EP1998/002917 patent/WO1998053196A1/de active IP Right Grant
Patent Citations (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE1126678B (de) | 1955-08-02 | 1962-03-29 | Max Mangl | Aus Pumpe und Duese zusammengefasstes Brennstoffeinspritzgeraet fuer Brennkraftkolbenmaschinen |
US4650116A (en) * | 1983-08-31 | 1987-03-17 | L'orange Gmbh | Fuel-injection device |
GB2226078A (en) * | 1988-11-09 | 1990-06-20 | Lucas Ind Plc | C.i. engine fuel injection nozzle |
DE4127003A1 (de) | 1991-08-16 | 1993-02-18 | Bosch Gmbh Robert | Elektrisch gesteuerte pumpeduese fuer kraftstoffeinspritzvorrichtungen in brennkraftmaschinen |
US5326034A (en) * | 1993-07-27 | 1994-07-05 | Cummins Engine Company, Inc. | Compact closed nozzle assembly for a fuel injector |
Also Published As
Publication number | Publication date |
---|---|
US6202940B1 (en) | 2001-03-20 |
JP2000515609A (ja) | 2000-11-21 |
CN1226949A (zh) | 1999-08-25 |
DE19721241C1 (de) | 1998-11-05 |
EP0914554A1 (de) | 1999-05-12 |
EP0914554B1 (de) | 2002-11-27 |
DE59806428D1 (de) | 2003-01-09 |
CN1083936C (zh) | 2002-05-01 |
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