EP0507780A1 - Kraftstoffeinspritzpumpe. - Google Patents
Kraftstoffeinspritzpumpe.Info
- Publication number
- EP0507780A1 EP0507780A1 EP90916700A EP90916700A EP0507780A1 EP 0507780 A1 EP0507780 A1 EP 0507780A1 EP 90916700 A EP90916700 A EP 90916700A EP 90916700 A EP90916700 A EP 90916700A EP 0507780 A1 EP0507780 A1 EP 0507780A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- pump
- pressure
- throttle
- fuel
- injection
- 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
- F02M41/00—Fuel-injection apparatus with two or more injectors fed from a common pressure-source sequentially by means of a distributor
- F02M41/08—Fuel-injection apparatus with two or more injectors fed from a common pressure-source sequentially by means of a distributor the distributor and pumping elements being combined
- F02M41/10—Fuel-injection apparatus with two or more injectors fed from a common pressure-source sequentially by means of a distributor the distributor and pumping elements being combined pump pistons acting as the distributor
- F02M41/12—Fuel-injection apparatus with two or more injectors fed from a common pressure-source sequentially by means of a distributor the distributor and pumping elements being combined pump pistons acting as the distributor the pistons rotating to act as the distributor
- F02M41/123—Fuel-injection apparatus with two or more injectors fed from a common pressure-source sequentially by means of a distributor the distributor and pumping elements being combined pump pistons acting as the distributor the pistons rotating to act as the distributor characterised by means for varying fuel delivery or injection timing
- F02M41/128—Varying injection timing by angular adjustment of the face-cam or the rollers support
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02D—CONTROLLING COMBUSTION ENGINES
- F02D1/00—Controlling fuel-injection pumps, e.g. of high pressure injection type
- F02D1/16—Adjustment of injection timing
- F02D1/18—Adjustment of injection timing with non-mechanical means for transmitting control impulse; with amplification of control impulse
- F02D1/183—Adjustment of injection timing with non-mechanical means for transmitting control impulse; with amplification of control impulse hydraulic
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02D—CONTROLLING COMBUSTION ENGINES
- F02D1/00—Controlling fuel-injection pumps, e.g. of high pressure injection type
- F02D1/16—Adjustment of injection timing
- F02D1/18—Adjustment of injection timing with non-mechanical means for transmitting control impulse; with amplification of control impulse
- F02D1/183—Adjustment of injection timing with non-mechanical means for transmitting control impulse; with amplification of control impulse hydraulic
- F02D2001/186—Adjustment of injection timing with non-mechanical means for transmitting control impulse; with amplification of control impulse hydraulic using a pressure-actuated piston for adjustment of a stationary cam or roller support
Definitions
- the invention relates to a fuel injection pump for internal combustion engines of the type defined in the preamble of claim 1.
- Such fuel injection pumps are known for example from G3 2 017 350 or DE 36 05 452 AI. Practical experience with these fuel injection pumps shows that unstable pressure vibrations often occur in the spring chamber of the hydraulic injection adjuster used in such fuel injection pumps. These trigger instabilities in the adjustment path of the injection adjustment piston, which, due to its adjustment action on the cam gear, leads to intolerability in the function of the FuelDritZDumoe.
- the fuel injection pump according to the invention with the characterizing features of claim 1 has the advantage that, due to the throttled coupling of the spring chamber of the injection adjuster to the pressure side of the feed pump, a partial fuel flow reaches the spring chamber and builds up a pressure level here that stabilizes the pressure vibrations. This improves the spray adjuster function of the spray adjuster with regard to linearity, repeatability and stability of the injection start setting.
- the spring chamber is partially decoupled from the suction side of the feed pump via a first throttle and connected to the pressure-side outlet of the feed pump via a second throttle.
- the throttle cross section of the first throttle is selected to be larger than that of the second
- Throttle Good stabilization is achieved if the first throttle has a bore diameter of approximately 0.9 mm and the second throttle has a bore diameter of approximately 0.6 mm.
- the throttled coupling of the spring chamber to the pressure side of the feed pump is implemented particularly expediently in that the throttle bore is made in the pressure piston of the pressure control valve and connects the pressure and spring chamber to one another.
- the spring chamber of the pressure control valve is then not as before with the suction side of the feed pump but with the spring chamber of the
- FIG. 1 shows a schematic illustration of a fuel injection pump for an internal combustion engine
- Fig. 2 schematically shows the drive shaft, cam gear and pump piston of the fuel injection pump in Fig. 1 and rotated in relation to Fig. 1 by 0 90 ° in the plane of the drawing.
- a pump piston 11 also serving as a distributor is set into a reciprocating and simultaneously rotating movement by a drive shaft 12 and with the aid of a cam gear 13.
- fuel is conveyed from a pump working space 14 delimited by the pump piston 11 via a longitudinal distribution groove 15 ° to one of a plurality of pressure channels 16, which are arranged around the pump piston 11 at uniform angular intervals and each associated with a combustion chamber of the internal combustion engine Guide the injection valve.
- the pump work chamber 14 is at 5 each suction stroke of the pump piston 11 with one
- Pump interior 17 in the pump housing 10 filled with fuel that is brought to injection pressure during the pressure stroke.
- the injection process is ended when one arranged in a relief line 18 between the pump working chamber 14 and pump interior 17
- Solenoid valve 19 or a slide (not shown here) on the pump piston opens the relief channel, which then leads through the pump piston.
- the pump interior 17 is from a feed pump 20 is supplied with fuel, which sucks fuel from a fuel tank 21 via a suction line 22 and delivers it via a pressure line 23 into the pump interior 17.
- the perfectionpu pe 20 is generally driven by the drive shaft 12, but can also have a separate electric motor.
- the output pressure of the feed pump 20 and thus the fuel pressure in the pump interior 17 is controlled by a pressure control valve 24, this pressure increasing with increasing speed of the drive shaft 12 in accordance with a desired function.
- the pressure control valve 24 has a pressure piston 26 which is displaceable in a bore 25 and which delimits on its one end side a pressure chamber 27 connected to the pressure line 23 and on its other end side a spring chamber 28 in which a return spring is supported on the bottom of the bore and on the pressure piston 26 29 is included.
- a pressure piston 26 moves against the force of the return spring 29 and increasingly releases a relief opening 30, which is connected to the suction line 22 via a relief line 31, towards the suction side of the feed pump 20.
- the cam gear 13 has, in a known manner, a roller ring 33 which carries rollers 32, which is rotatably mounted in the pump housing 10 by a certain angle and is coupled in a rotationally locking manner to an injection adjusting piston 35 of an injection adjuster 36 via an adjusting bolt 34.
- the tangential to the roller ring 33 in a bore 37 in the Pu pen housing 10 axially displaceable injection adjusting piston 35 delimits with its one end a control chamber 38, which is connected via a throttle channel 39 to the pump interior 17, and with its other end a spring chamber.
- a face cam or lifting disk 43 is fastened to the pump piston 11 and runs with its elevations or face cams 44 bearing surface on the rollers 32 of the roller ring 33, the number of face cams 44 corresponding to the number of pressure channels 16.
- the contact force of the end cams 44 on the rollers 32 is applied by a contact spring 45.
- the spring chamber 40 of the injection adjuster 36 is connected to the suction side of the feed pump 20 via a first throttle 46, which is indicated in FIG. 1 by a schematically illustrated connecting line 47. Furthermore, the spring chamber 40 of the injection adjuster 36 is connected to the spring chamber 28 of the pressure control valve 24 via a second connecting line 48. In this connection is a seat valve 52 controlled by an expansion element 49, which opens above a predetermined value of the cooling water temperature of the internal combustion engine and thus releases the second connecting line 48.
- the spring chamber 28 of the pressure control valve 24 is connected to the pressure side of the feed pump 20 via a second throttle 50.
- the second throttle 50 is expediently designed as an axial throttle bore which completely penetrates the pressure piston 26 and which connects the pressure chamber 27 of the pressure control valve 24 to the spring chamber 28.
- the throttle cross section of the second throttle 50 is kept smaller than the throttle cross section of the first throttle 46.
- the bore diameter of the first throttle 46 is 0.9 mm and the bore diameter of the second throttle 0.6 mm.
- a cold start accelerator (KSB) 51 known per se, is provided in the fuel injection pump, which is designed here as a hydraulic KSB 51.
- the thermostatically controlled seat valve 49 and a pressure relief valve 53 which is arranged in a parallel line 54 to the seat valve 49 and which opens when a certain interior pressure is reached.
- the relief of the spring chamber 28 is prevented by the seat valve 49 when the internal combustion engine is cold and during the warm-up phase, so that the pressure prevailing in the interior of the fuel injection pump comes into play and the relief opening 30 is closed by the piston 26. This increases the internal pressure and causes the injection adjustment piston 35 to move in the direction of the early start of injection.
- the degree of spray adjustment is limited by the pressure-limiting valve 53 when the speed increases and the interior increases.
Landscapes
- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Fuel-Injection Apparatus (AREA)
Description
Claims
Applications Claiming Priority (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE3943246 | 1989-12-29 | ||
DE3943246A DE3943246A1 (de) | 1989-12-29 | 1989-12-29 | Kraftstoffeinspritzpumpe |
PCT/DE1990/000908 WO1991010056A1 (de) | 1989-12-29 | 1990-11-24 | Kraftstoffeinspritzpumpe |
Publications (2)
Publication Number | Publication Date |
---|---|
EP0507780A1 true EP0507780A1 (de) | 1992-10-14 |
EP0507780B1 EP0507780B1 (de) | 1994-04-06 |
Family
ID=6396576
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP90916700A Expired - Lifetime EP0507780B1 (de) | 1989-12-29 | 1990-11-24 | Kraftstoffeinspritzpumpe |
Country Status (5)
Country | Link |
---|---|
US (1) | US5243943A (de) |
EP (1) | EP0507780B1 (de) |
JP (1) | JPH05502710A (de) |
DE (2) | DE3943246A1 (de) |
WO (1) | WO1991010056A1 (de) |
Families Citing this family (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE4311672A1 (de) * | 1993-04-08 | 1994-10-13 | Bosch Gmbh Robert | Kraftstoffeinspritzpumpe |
JP3435881B2 (ja) * | 1995-03-22 | 2003-08-11 | 株式会社デンソー | 分配型燃料噴射ポンプ |
DE10156989A1 (de) * | 2001-11-21 | 2003-06-05 | Bosch Gmbh Robert | Mechanische Verteilereinspritzpumpe mit Kaltstartbeschleunigung |
DE102015016925A1 (de) | 2015-12-24 | 2017-06-29 | Audi Ag | Kraftstoffpumpe |
Family Cites Families (14)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2910975A (en) * | 1957-02-22 | 1959-11-03 | Cav Ltd | Liquid fuel pumps for internal combustion engines |
US3486492A (en) * | 1967-11-07 | 1969-12-30 | Allis Chalmers Mfg Co | Timing advance mechanism |
US3633559A (en) * | 1970-06-19 | 1972-01-11 | Bosch Gmbh Robert | Apparatus for regulating the timing of fuel injection in internal combustion engines |
DE2812176A1 (de) * | 1978-03-20 | 1979-09-27 | Volkswagenwerk Ag | Verteiler-einspritzpumpe fuer eine selbstzuendende brennkraftmaschine |
DE2931978A1 (de) * | 1979-08-07 | 1981-02-26 | Bosch Gmbh Robert | Kraftstoffeinspritzpumpe fuer brennkraftmaschinen |
DE3121635A1 (de) * | 1981-05-30 | 1982-12-23 | Robert Bosch Gmbh, 7000 Stuttgart | Kraftstoffeinspritzpumpe fuer brennkraftmaschinen |
DE3138607A1 (de) * | 1981-09-29 | 1983-04-14 | Robert Bosch Gmbh, 7000 Stuttgart | Kraftstoffeinspritzpumpe fuer brennkraftmaschinen |
DE3410146A1 (de) * | 1984-03-20 | 1985-10-03 | Robert Bosch Gmbh, 7000 Stuttgart | Kraftstoffeinspritzpumpe fuer brennkraftmaschinen |
JPS6117150U (ja) * | 1984-05-28 | 1986-01-31 | 株式会社ボッシュオートモーティブ システム | 分配型燃料噴射ポンプ |
DE3423212A1 (de) * | 1984-06-22 | 1986-01-02 | Robert Bosch Gmbh, 7000 Stuttgart | Kraftstoffeinspritzpumpe |
DE3517974A1 (de) * | 1985-05-18 | 1986-11-20 | Robert Bosch Gmbh, 7000 Stuttgart | Kraftstoffeinspritzpumpe fuer brennkraftmaschinen |
DE3619325A1 (de) * | 1986-06-09 | 1987-12-10 | Bosch Gmbh Robert | Kraftstoffeinspritzpumpe fuer brennkraftmaschinen |
DE3822257A1 (de) * | 1988-07-01 | 1990-01-04 | Bosch Gmbh Robert | Kraftstoffeinspritzpumpe fuer brennkraftmaschinen |
DE4117813A1 (de) * | 1991-05-31 | 1992-12-03 | Bosch Gmbh Robert | Kraftstoffeinspritzpumpe fuer brennkraftmaschinen |
-
1989
- 1989-12-29 DE DE3943246A patent/DE3943246A1/de not_active Withdrawn
-
1990
- 1990-11-24 JP JP2515314A patent/JPH05502710A/ja active Pending
- 1990-11-24 EP EP90916700A patent/EP0507780B1/de not_active Expired - Lifetime
- 1990-11-24 US US07/867,109 patent/US5243943A/en not_active Expired - Fee Related
- 1990-11-24 WO PCT/DE1990/000908 patent/WO1991010056A1/de active IP Right Grant
- 1990-11-24 DE DE90916700T patent/DE59005297D1/de not_active Expired - Fee Related
Non-Patent Citations (1)
Title |
---|
See references of WO9110056A1 * |
Also Published As
Publication number | Publication date |
---|---|
EP0507780B1 (de) | 1994-04-06 |
DE3943246A1 (de) | 1991-07-04 |
JPH05502710A (ja) | 1993-05-13 |
US5243943A (en) | 1993-09-14 |
DE59005297D1 (de) | 1994-05-11 |
WO1991010056A1 (de) | 1991-07-11 |
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