EP0263304B1 - Fuel injection pump for internal combustion engines - Google Patents
Fuel injection pump for internal combustion engines Download PDFInfo
- Publication number
- EP0263304B1 EP0263304B1 EP87112919A EP87112919A EP0263304B1 EP 0263304 B1 EP0263304 B1 EP 0263304B1 EP 87112919 A EP87112919 A EP 87112919A EP 87112919 A EP87112919 A EP 87112919A EP 0263304 B1 EP0263304 B1 EP 0263304B1
- Authority
- EP
- European Patent Office
- Prior art keywords
- pump
- recess
- control slide
- control
- space
- 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.)
- Expired - Lifetime
Links
- 239000000446 fuel Substances 0.000 title claims description 23
- 238000002347 injection Methods 0.000 title claims description 20
- 239000007924 injection Substances 0.000 title claims description 20
- 238000002485 combustion reaction Methods 0.000 title claims description 4
- 230000006378 damage Effects 0.000 description 4
- 229910000760 Hardened steel Inorganic materials 0.000 description 2
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 2
- 229910052782 aluminium Inorganic materials 0.000 description 2
- 230000009849 deactivation Effects 0.000 description 1
- 230000003628 erosive effect Effects 0.000 description 1
- 239000002828 fuel tank Substances 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 239000007779 soft material Substances 0.000 description 1
Images
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
- F02M59/20—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
-
- 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
- F02M55/001—Pumps with means for preventing erosion on fuel discharge
-
- 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
Definitions
- the invention is based on a fuel injection pump for internal combustion engines according to the generic preamble of the only claim.
- the injection quantity and / or the start of injection and, in accordance with the set rotational position of the pump piston, the associated injection end is also determined by the axial position of the control slide.
- the end of high-pressure injection - on the one hand, in terms of time as the injection end, on the other hand, as the end of high-pressure delivery that determines the injection quantity - is determined in that the control opening on the pump piston is exposed by the control slide, so that the fuel, which is under very high pressure, is discharged from the pump work chamber the relief channel and the control opening in the recess of the cylinder liner is controlled.
- the deflected fuel jet has an extraordinarily high kinetic energy, which leads to a high load on the materials which the jet hits.
- the pressures in the pump workspace of the pump can reach up to 1,300 bar.
- the energy losses from the pump work room to the shutdown point are relatively low, since the injection is suddenly interrupted from the shutdown in order to ensure that the nozzle needle closes quickly.
- This type of beam deflection has the disadvantage that the deflected beam, which is still under very high kinetic energy, either loads the signal box of the control slide or strikes the wall of the suction chamber, which, like the entire pump housing, consists of soft material, for example aluminum, the pump cylinder liner and the spool are made of hardened steel. The result is cavitation and erosion damage to the suction chamber wall of the pump housing and to the control parts in the suction chamber.
- a further advantage is that the aprons are axially displaced with the control slide secured against twisting, so that there is always a sufficient passage cross-section between the gaps formed by the control slide and recess and the suction space. Furthermore, the opening of the recess is only provided radially on one side with respect to the cylinder liner longitudinal axis, so that the aprons are correspondingly only present at one end of the control slide which faces the suction chamber.
- the rear wall of the recess, which is formed by the cylinder liner is thus made of hardened steel. so that the deflecting beam striking this cannot do any damage.
- FIG. 1 shows a partial longitudinal section. by a fuel injection pump according to the invention and Fig. 2 shows a cross section along line II-II in Fig.1.
- a cylinder liner 2 is inserted, in which a pump piston 3 is driven by means (not shown) for its reciprocating movement.
- a recess 4 formed in the manner of a bag opening, which receives a control slide 5 which can be axially displaced on the pump piston 3.
- the recess 4 has an access 6 via which the control slide 5 can be used.
- an elongated slot 8 into which a lug 9 of the control slide 5 engages, whereby the control slide 5 can perform an axial movement and is secured against rotation.
- control slide 5 takes place via a rotatable control rod 11, on which a driving member 12 with a head 13 can be tightened by a screw 14 and is therefore adjustable in the rotational position, the head 13 engaging in a transverse groove 15 of the control slide 5.
- a plurality of such pump elements 2, 3 with control slides 5 are preferably arranged in series in the housing 1, which are then operated together by a control rod 11, the driving elements 12 of which correspond to the number of pump elements.
- the control rod 11 and the entrainment members 12 are arranged in a pump suction chamber 16 which, as is not shown in more detail, is supplied with fuel under low pressure from a fuel tank via a feed pump.
- the access 6 of the recess 4 of the pump cylinder 2 faces this suction chamber 16, so that there is an open connection between the recess 4 and the suction chamber 16.
- the pump piston 3 assumes its bottom dead center position (UT), opening up suction openings 17 of the pump work chamber 18, which are connected to the pump suction chamber 16 via a channel 19 present in the pump cylinder liner 2 or a twist 21 on the cylinder liner 2 .
- an oblique groove 22 and recess 23 are arranged, which are arranged as control openings in pairs on the pump piston 3 and are connected to one another via a transverse bore 24, which leads via a blind bore 25 to the pump work chamber 18.
- These control openings namely the oblique grooves 22 and recesses 23, cooperate with two radial bores 26 of the control slide 5 serving as radial openings, the input edges 27 of these radial bores 26 serving as control edges towards the control openings, while the orifices 28 of these radial bores 26 on parallel side walls 29 the recess 4 are directed.
- the space gaps 31 formed between the side walls 29 and the control slide 5 are covered toward the suction space 16 by aprons 32 arranged on the control slide 5, which have baffle surfaces 33 running perpendicular to the gap expansion.
- the illustrated embodiment works as follows: In the illustrated UT position of the pump piston 3, the pump working chamber 18 is filled with fuel via the suction openings 17 and the channel 19 or the twist 21 from the pump suction chamber 16. Depending on the axial position of the control slide 5, part of the fuel supply can also take place via the recesses 23 or oblique grooves 22, the transverse bore 24 and the blind bore 25. During the delivery stroke of the pump piston 3, part of the fuel is first displaced from the pump working chamber 18 back into the suction chamber 16 via the supply channels, at least until the suction openings 17 are closed by the pump piston 3 and at the latest until the recesses 23 or Oblique grooves 22 are covered by the control slide 5.
- the high pressure can develop in the pump work chamber 18 and the injection to the internal combustion engine can begin.
- This injection is ended when the control openings, namely the oblique grooves 22, overlap with the radial bores 26 of the control slide 5.
- the fuel which is under very high pressure, is now extracted from the pump working chamber 18 via the blind bore 25, the transverse bore 24, the oblique grooves 22 and the radial bores 26 are conveyed into the space gaps 31, with the control fuel jet being formed meets the opposite side walls 29.
- the beam is reflected on these side walls 29 and partially strikes the rear wall 7, for the most part the impact surfaces 33 of the aprons 32, in order to then flow into the remaining spaces of the recess 4 above and below the control slide 5. From here, the fuel then reaches the suction chamber 16.
- the aprons 32 present in the area of the access 6 to the recess 4 at the shoulders widening the control slide 5 and provided with the baffle surfaces 33 can either dive straight into the access 6 of the recess 4 or can remain outside the same, only through the baffle surfaces 33 must be achieved that the fuel jet is reflected for energy destruction.
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- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Fuel-Injection Apparatus (AREA)
Description
Die Erfindung geht aus von einer Kraftstoffeinspritzpumpe für Brennkraftmaschinen nach dem gattungsbildenden Oberbegriff des einzigen Patentanspruchs.The invention is based on a fuel injection pump for internal combustion engines according to the generic preamble of the only claim.
Bei derartigen schiebergesteuerten Kraftstoffeinspritzpumpen wird die Einspritzmenge und/oder der Spritzbeginn und entsprechend der eingestellten Drehlage des Pumpenkolbens auch das zugehörige Spritzende durch die axiale Lage des Steuerschiebers bestimmt. In jedem Fall wird aber das Ende der Hochdruckeinspritzung - einerseits zeitlich gesehen als Spritzende andererseits als einspritzmengenbestimmendes Ende der Hochdruckförderung - dadurch bestimmt, daß die auf dem Pumpenkolben vorhandene Steueröffnung vom Steuerschieber freigelegt wird, so daß der unter sehr hohem Druck stehende Kraftstoff aus dem Pumpenarbeitsraum über den Entlastungskanal und die Steueröffnung in die Ausnehmung der Zylinderbüchse abgesteuert wird. Bei dieser mittels Steuerkanten des Steuerschiebers durchgeführten Absteuerung weist der abgesteuerte Kraftstoffstrahl eine außerordentlich hohe kinetische Energie auf, die zu einer hohen Belastung der Werkstoffe führt, auf die der Strahl trifft. Immerhin können die Drücke im Pumpenarbeitsraum der Pumpe bis zu 1.300 bar erreichen. Die Energieverluste vom Pumpenarbeitsraum bis zur Absteuerstelle sind verhältnismäßig gering, da ab Absteuerung die Einspritzung schlagartig unterbrochen wird, um ein schnelles Düsennadelschließen sicherzustellen.In the case of such slide-controlled fuel injection pumps, the injection quantity and / or the start of injection and, in accordance with the set rotational position of the pump piston, the associated injection end is also determined by the axial position of the control slide. In any case, however, the end of high-pressure injection - on the one hand, in terms of time as the injection end, on the other hand, as the end of high-pressure delivery that determines the injection quantity - is determined in that the control opening on the pump piston is exposed by the control slide, so that the fuel, which is under very high pressure, is discharged from the pump work chamber the relief channel and the control opening in the recess of the cylinder liner is controlled. In this deactivation, which is carried out by means of control edges of the control slide, the deflected fuel jet has an extraordinarily high kinetic energy, which leads to a high load on the materials which the jet hits. After all, the pressures in the pump workspace of the pump can reach up to 1,300 bar. The energy losses from the pump work room to the shutdown point are relatively low, since the injection is suddenly interrupted from the shutdown in order to ensure that the nozzle needle closes quickly.
Bei einer solchen bekannten Kraftstoffeinspritzpumpe der gattungsgemäßen Bauart (DE-A-34 28 174) sind im Steuerschieber zwei als radiale Absteuerbohrungen ausgebildete Radialöffnungen vorhanden, durch die je eine als Steueröffnung auf dem Pumpenkolben angeordnete schräge Steuernut nach Zurücklegen des effektiven Einspritzhubes aufgesteuert wird. Der Absteuerstrahl schießt beim Aufsteuern durch diese Absteuerbohrungen auf die Seitenwände der Ausnehmung in der Zylinderbüchse. Da diese Wände nur in Spaltbreite von den Mündungen der Absteuerbohrungen entfernt sind, wird jeder Strahl vonder Wand in den Spalt hinein reflektiert und gelangt einesteils auf mindestens eine der Stirnseiten des Steuerschiebers, wodurch unerwünschte Kräfte in das zugehörige Stellwerk gelangen, und andernteils mit sehr hoher Energie in den Saugraum im Pumpengehäuse. Diese Art der Strahlablenkung hat den Nachteil, daß der noch unter sehr hoher kinetischer Energie stehende abgelenkte Strahl entweder das Stellwerk des Steuerschiebers belastet oder die Wand des Saugraums trifft, die, wie das ganze Pumpengehäuse, aus weichem Material, beispielsweise Aluminium besteht, wobei die Pumpenzylinderbüchse und der Steuerschieber aus gehärtetem Stahl bestehen. Die Folge sind Kavitations- und Erosionsschäden an der Saugraumwand des Pumpengehäuses und an den im Saugraum befindlichen Steuerungsteilen.In such a known fuel injection pump of the generic type (DE-A-34 28 174) there are two radial openings in the control slide designed as radial control bores, through which an inclined control groove arranged as a control opening on the pump piston is opened after the effective injection stroke has been completed. The pilot jet shoots through these pilot bores onto the side walls of the recess in the cylinder liner. Since these walls are only a gap away from the mouths of the pilot bores, each beam is reflected from the wall into the gap and reaches part of it on at least one of the end faces of the spool, causing undesirable forces to enter the associated signal box, and part with very high energy into the suction chamber in the pump housing. This type of beam deflection has the disadvantage that the deflected beam, which is still under very high kinetic energy, either loads the signal box of the control slide or strikes the wall of the suction chamber, which, like the entire pump housing, consists of soft material, for example aluminum, the pump cylinder liner and the spool are made of hardened steel. The result is cavitation and erosion damage to the suction chamber wall of the pump housing and to the control parts in the suction chamber.
Bei der erfindungsgemäßen Kraftstoffeinspritzpumpe mit den kennzeichnenden Merkmalen des einzigen Patentanspruchs wird demgegenüber in vorteilhafter Weise erreicht, daß der Absteuerstrahl mehrfach reflektiert wird, nämlich von den Seitenwänden der Ausnehmung und des Steuerschiebers auf die Prallflächen der Schürzen und von diesen wieder zurück, so daß durch den relativ langen Weg in den Raumspalten die Strahlenergie nahezu vernichtet wird, bevor dann der Kraftstoff im wesentlichen oberhalb bzw. unterhalb der Schürzen zum Saugraum strömt. Durch eine solche mehrmalige Umlenkung im Bereich gehärteter Bauteile wird so viel Energie des austretenden Kraftstoffstrahls abgebaut, daß keine merklichen Karitationsschäden mehr an den benachbarten Wandungen des üblicherweise aus Aluminium bestehenden Pumpengehäuses auftreten. Ein weiterer Vorteil dabei ist, daß die Schürzen mit dem gegen Verdrehen gesicherten Steuerschieber axial verschoben werden und so stets ein ausreichender Durchtrittsquerschnitt zwischen den durch Steuerschieber und Ausnehmung gebildeten Spalten und dem Saugraum besteht. Des weiteren ist der Zugang der Ausnehmung in bezug auf die Zylinderbüchsenlängsachse radial nur einseitig vorgesehen so daß auch die Schürzen entsprechend nur an dem einen Ende des Steuerschiebers vorhanden sind, das dem Saugraum zugewandt ist. Die Rückwand der Ausnehmung, die durch die Zylinderbüchse gebildet wird, besteht somit aus gehärtetem Stahl. so daß der auf diese treffende Ablenkstrahl keinen Schaden anrichten kann.In the fuel injection pump according to the invention with the characterizing features of the single patent claim, on the other hand, it is advantageously achieved that the exhaust beam is reflected several times, namely from the side walls of the recess and the control slide on the baffles of the aprons and back again, so that by the relative long way in the gaps in the beam energy is almost destroyed before the fuel then essentially above or below the aprons to the suction chamber flows. Such repeated deflection in the area of hardened components dissipates so much energy from the emerging fuel jet that no noticeable damage to the adjacent walls of the pump housing, which is usually made of aluminum, occurs. A further advantage is that the aprons are axially displaced with the control slide secured against twisting, so that there is always a sufficient passage cross-section between the gaps formed by the control slide and recess and the suction space. Furthermore, the opening of the recess is only provided radially on one side with respect to the cylinder liner longitudinal axis, so that the aprons are correspondingly only present at one end of the control slide which faces the suction chamber. The rear wall of the recess, which is formed by the cylinder liner, is thus made of hardened steel. so that the deflecting beam striking this cannot do any damage.
Weitere Vorteile und vorteilhafte Ausgestaltungen der Erfindung sind der nachfolgenden Beschreibung und der Zeichnung entnehmbar.Further advantages and advantageous embodiments of the invention can be found in the following description and the drawing.
Ein Ausführungsbeispiel des Gegenstandes der Erfindung ist in der Zeichnung dargestellt und im folgenden näher beschrieben. Es zeigen Fig. 1 einen Teillängsschnitt. durch eine erfindungsgemäße Kraftstoffeinspritzpumpe und Fig. 2 einen Querschnitt nach Linie II-II in Fig.1.An embodiment of the object of the invention is shown in the drawing and described in more detail below. 1 shows a partial longitudinal section. by a fuel injection pump according to the invention and Fig. 2 shows a cross section along line II-II in Fig.1.
In einem nur teilweise gezeigten Pumpengehäuse 1 einer Kraftstoffeinspritzpumpe ist eine Zylinderbüchse 2 eingesetzt, in der ein Pumpenkolben 3 durch nicht dargestellte Mittel für seine hin- und hergehende Bewegung angetrieben wird. In der Zylinderbüchse 2 ist eine in Art einer Sacköffnung gebildete Ausnehmung 4 vorhanden, die einen auf dem Pumpenkolben 3 axial verschiebbaren Steuerschieber 5 aufnimmt. Die Ausnehmung 4 weist einen Zugang 6 auf, über den der Steuerschieber 5 einsetzbar ist. In der Rückwand 7 der Ausnehmung 4 ist ein Langsschlitz 8 vorhanden, in den eine Nase 9 des Steuerschiebers 5 greift, wodurch der Steuerschieber 5 eine Axialbewegung durchführen kann und gegen Verdrehen gesichert ist.In a
Die axiale Betätigung des Steuerschiebers 5 erfolgt über eine verdrehbare Regelstange 11, auf der ein Mitnahmeglied 12 mit einem Kopf 13 durch eine Schraube 14 festspannbar und damit in der Drehlage verstellbar angeordnet ist, wobei der Kopf 13 in eine Quernut 15 des Steuerschiebers 5 greift.The axial actuation of the
Vorzugsweise sind bei einer Kraftstoffeinspritzpumpe mehrere solcher Pumpenelemente 2, 3 mit Steuerschiebern 5 in Reihe im Gehäuse 1 angeordnet, die dann gemeinsam durch eine Regelstange 11 bedient werden, deren Mitnahmeglieder 12 der Zahl der Pumpenelemente entsprechen. Die Regelstange 11 und die Mitnahmeglieder 12 sind in einem Pumpensaugraum 16 angeordnet, der, wie nicht näher dargestellt, über eine Förderpumpe von einem Kraftstoffbehälter aus mit Kraftstoff unter niederem Druck versorgt wird. Der Zugang 6 der Ausnehmung 4 des Pumpenzylinders 2 ist zu diesem Saugraum 16 hin gewandt, so daß zwischen Ausnehmung 4 und Saugraum 16 eine offene Verbindung besteht.In the case of a fuel injection pump, a plurality of
Der Pumpenkolben 3 nimmt in der dargestellten Stellung seine untere Totpunktlage (UT) ein, wobei er Saugöffnungen 17 des Pumpenarbeitsraums 18 aufsteuert, die über einen in der Pumpenzylinderbüchse 2 vorhandenen Kanal 19 bzw. eine Abdrehung 21 an der Zylinderbüchse 2 mit dem Pumpensaugraum 16 verbunden sind.In the position shown, the
In der Mantelfläche des Pumpenkolbens 3 ist eine Schrägnut 22 und Ausnehmung 23 angeordnet, die als Steueröffnungen paarweise auf dem Pumpenkolben 3 angeordnet über eine Querbohrung 24 miteinander verbunden sind, welche über eine Sackbohrung 25 zum Pumpenarbeitsraum 18 führt. Diese Steueröffnungen, nämlich die Schrägnuten 22 und Ausnehmungen 23, wirken mit zwei als Radialöffnungen dienenden Radialbohrungen 26 des Steuerschiebers 5 zusammen, wobei die Eingangskanten 27 dieser Radialbohrungen 26 als Steuerkante zu den Steueröffnungen hin dienen, während die Mündungen 28 dieser Radialbohrungen 26 auf parallele Seitenwände 29 der Ausnehmung 4 gerichtet sind.In the lateral surface of the
Die zwischen den Seitenwänden 29 und dem Steuerschieber 5 gebildeten Raumspalte 31 sind zum Saugraum 16 hin durch am Steuerschieber 5 angeordnete Schürzen 32 verdeckt, die senkrecht zur Spaltausdehnung verlaufende Prallflächen 33 aufweisen.The
Das dargestellte Ausführungsbeispiel arbeitet wie folgt:
In der dargestellten UT-Lage des Pumpenkolbens 3 wird der Pumpenarbeitsraum 18 über die Saugöffnungen 17 und - den Kanal 19 bzw. die Abdrehung 21 vom Pumpensaugraum 16 her mit Kraftstoff aufgefüllt. Je nach Axiallage des Steuerschiebers 5 kann auch ein Teil der Kraftstoffversorgung über die Ausnehmungen 23 bzw. Schrägnuten 22, die Querbohrung 24 und die Sackbohrung 25 erfolgen. Beim Förderhub des Pumpenkolbens 3 wird zuerst über die Versorgungskanäle ein Teil des Kraftstoffes aus dem Pumpenarbeitsraum 18 wieder zurück in den Saugraum 16 verdrängt, mindestens so lange bis die Saugöffnungen 17 durch den Pumpenkolben 3 geschlossen sind und spätestens so lange bis auch die Ausnehmungen 23 bzw. Schrägnuten 22 durch den Steuerschieber 5 verdeckt sind. Ab dieser Förderhubstellung kann sich im Pumpenarbeitsraum 18 der Hochdruck entwickeln und die Einspritzung zur Brennkraftmaschine beginnen. Diese Einspritzung wird dann beendet, wenn die Steueröffnungen, nämlich die Schrägnuten 22, in Überdeckung gelangen mit den Radialbohrungen 26 des Steuerschiebers 5. Der unter sehr hohem Druck stehende Kraftstoff wird nun aus dem Pumpenarbeitsraum 18 über die Sackbohrung 25, die Querbohrung 24, die Schrägnuten 22 und die Radialbohrungen 26 in die Raumspalte 31 gefördert, wobei der sich dabei bildende Absteuerkraftstoffstrahl auf die gegenüberliegenden Seitenwände 29 trifft. An diesen Seitenwänden 29 wird der Strahl reflektiert und trifft teilweise auf die Rückwand 7, zum größten Teil auf die Prallflächen 33 der Schürzen 32, um danach in die verbleibenden Räume der Ausnehmung 4 oberhalb und unterhalb des Steuerschiebers 5 zu strömen. Von hier aus gelangt dann der Kraftstoff in den Saugraum 16.The illustrated embodiment works as follows:
In the illustrated UT position of the
Die im Bereich des Zugangs 6 zur Ausnehmung 4 an den den Steuerschieber 5 verbreiternden Absätzen vorhandenen, mit den Prallflächen 33 versehenen Schürzen 32 können entweder noch gerade in den Zugang 6 der Ausnehmung 4 tauchen oder aber auch außerhalb desselben bleiben, wobei nur durch die Prallflächen 33 erreicht sein muß, daß der Kraftstoffstrahl zur Energievernichtung reflektiert wird.The
- 11
- PumpengehäusePump housing
- 22nd
- ZylinderbüchseCylinder liner
- 33rd
- PumpenkolbenPump piston
- 44th
- AusnehmungRecess
- 55
- SteuerschieberSpool
- 66
- ZugangAccess
- 77
- Rückwand von 4Rear wall of 4
- 88th
- LängsschlitzLongitudinal slot
- 99
- Nasenose
- 1010th
- --
- 1111
- RegelstangeControl rod
- 1212
- MitnahmegliedDriving link
- 1313
- Kopfhead
- 1414
- Schraubescrew
- 1515
- QuernutCross groove
- 1616
- PumpensaugraumPump suction room
- 1717th
- SaugöffnungeSuction openings
- 1818th
- PumpenarbeitsraumPump work room
- 1919th
- Kanalchannel
- 2020th
- --
- 2121
- AbdrehungCalibration
- 2222
- SchrägnutOblique groove
- 2323
- AusnehmungRecess
- 2424th
- QuerbohrungCross hole
- 2525th
- SackbohrungBlind hole
- 2626
- Radialbohrungen (in Anspruch Radialöffnungen)Radial bores (use radial openings)
- 2727th
- Eingangskanten an 26Entrance edges at 26
- 2828
- Mündungen von 26Mouths of 26
- 2929
- Seitenwände von 4Sidewalls of 4
- 3030th
- --
- 3131
- RaumspaltSpace gap
- 3232
- SchürzenAprons
- 3333
- senkr. Flächenvertical Surfaces
Claims (1)
- Fuel injection pump for internal combustion engines, with at least one pump element, on the pump plunger (3) and in the barrel (2) of which, the said barrel being inserted in the pump casing (1), there is arranged, in a recess (4) present there and having a radial access opening (6), a control slide (5) guided in axially displaceable fashion, secured against rotation and serving to control the fuel, two radial and mutually parallel space-forming gaps (31) which serve to guide the fuel being formed between the control slide (5) and two mutually opposite, parallel side walls (29) of the recess (4); with two control openings (oblique grooves 22, recesses 23) on the lateral surface of the pump plunger (3), which are connected to the pump working space (18) by a relief passage (24, 25) extending in the pump plunger (3) and, to end the injection, can be opened by the control slide (5) and, for this purpose, interact in each case with a control edge (27) of two radial openings (26) of the control slide (5), the said radial openings pointing towards the side walls (29), in such a way that the discharged jet in each case strikes one of the side walls (29) of the recess (4), and with a pump suction space (16) which is arranged in the pump casing (1) and into which the two radial space-forming gaps (31) open via the access opening (6) of the recess (4), characterised in that on the control slide (5), in the region of the access opening (6) of the recess (4) extending in the form of a blind hole from the pump suction space (16) into the barrel (2), there is in each case a skirt (32) for at least partially covering over the radial space-forming gaps (31) towards the pump suction space (16), each skirt having a rebound face (33) which extends at right angles to the space-forming gaps (31) and side walls (29) of the recess (4), and is present on the shoulders widening the control slide (5).
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE3633899 | 1986-10-04 | ||
| DE19863633899 DE3633899A1 (en) | 1986-10-04 | 1986-10-04 | FUEL INJECTION PUMP FOR INTERNAL COMBUSTION ENGINES |
Publications (3)
| Publication Number | Publication Date |
|---|---|
| EP0263304A2 EP0263304A2 (en) | 1988-04-13 |
| EP0263304A3 EP0263304A3 (en) | 1989-04-19 |
| EP0263304B1 true EP0263304B1 (en) | 1992-04-29 |
Family
ID=6311091
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| EP87112919A Expired - Lifetime EP0263304B1 (en) | 1986-10-04 | 1987-09-04 | Fuel injection pump for internal combustion engines |
Country Status (4)
| Country | Link |
|---|---|
| US (1) | US4811716A (en) |
| EP (1) | EP0263304B1 (en) |
| JP (1) | JPS6390664A (en) |
| DE (2) | DE3633899A1 (en) |
Families Citing this family (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE3844430A1 (en) * | 1988-12-31 | 1990-07-05 | Bosch Gmbh Robert | FUEL INJECTION PUMP FOR INTERNAL COMBUSTION ENGINES |
| DE3902670A1 (en) * | 1989-01-30 | 1990-08-02 | Voest Alpine Automotive | INJECTION PUMP FOR DIESEL ENGINES |
| US5364243A (en) * | 1989-08-02 | 1994-11-15 | Diesel Kiki Co., Ltd. | Fuel injection pump |
| DE4016435C2 (en) * | 1990-05-22 | 1997-05-28 | Daimler Benz Ag | A diaphragm-controlled fuel injection pump for internal combustion engines having a control slide, in particular as a direct injector for commercial vehicles |
| DE4041503C2 (en) * | 1990-12-22 | 2001-02-15 | Bosch Gmbh Robert | Fuel injection pump for internal combustion engines |
| DE4041656A1 (en) * | 1990-12-22 | 1992-07-02 | Bosch Gmbh Robert | FUEL INJECTION PUMP FOR INTERNAL COMBUSTION ENGINES |
| DE4132505A1 (en) * | 1991-09-30 | 1993-04-01 | Bosch Gmbh Robert | FUEL INJECTION PUMP FOR INTERNAL COMBUSTION ENGINES |
| DE4132502C2 (en) * | 1991-09-30 | 2001-09-27 | Bosch Gmbh Robert | Fuel injection pump |
| DE4211886A1 (en) * | 1992-04-09 | 1993-10-14 | Bosch Gmbh Robert | Fuel injection pump for internal combustion engines |
| DE19919430C1 (en) * | 1999-04-29 | 2000-10-19 | Bosch Gmbh Robert | Injection pump |
| EP1801411B1 (en) * | 2001-01-05 | 2009-08-05 | Hitachi, Ltd. | Fluid pump and high-pressure fuel feed pump |
Family Cites Families (12)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FR1446048A (en) * | 1964-05-25 | 1966-07-15 | Bryce Berger Ltd | Advanced pump for liquid fuel injection |
| GB1271799A (en) * | 1968-09-24 | 1972-04-26 | Cav Ltd | Fuel injection pumps |
| DE3017730A1 (en) * | 1980-05-09 | 1981-11-12 | Robert Bosch Gmbh, 7000 Stuttgart | FUEL INJECTION PUMP FOR INTERNAL COMBUSTION ENGINES |
| DE3136751A1 (en) * | 1981-09-16 | 1983-03-31 | Robert Bosch Gmbh, 7000 Stuttgart | FUEL INJECTION PUMP FOR INTERNAL COMBUSTION ENGINES |
| WO1985005152A1 (en) * | 1984-05-08 | 1985-11-21 | Mitsubishi Jidosha Kogyo Kabushiki Kaisha | Fuel injection pump and method of adjusting the same pump |
| DE3428176C2 (en) * | 1984-07-31 | 1994-08-25 | Bosch Gmbh Robert | Fuel injection pump for internal combustion engines |
| DE3428174A1 (en) * | 1984-07-31 | 1986-02-13 | Robert Bosch Gmbh, 7000 Stuttgart | FUEL INJECTION PUMP FOR INTERNAL COMBUSTION ENGINES |
| DE3435987A1 (en) * | 1984-10-01 | 1986-04-10 | Robert Bosch Gmbh, 7000 Stuttgart | FUEL INJECTION PUMP FOR INTERNAL COMBUSTION ENGINES |
| JPS61123756A (en) * | 1984-11-16 | 1986-06-11 | Diesel Kiki Co Ltd | Fuel injection pump |
| DE3447375A1 (en) * | 1984-12-24 | 1986-07-03 | Robert Bosch Gmbh, 7000 Stuttgart | FUEL INJECTION PUMP FOR INTERNAL COMBUSTION ENGINES |
| JPH0541262Y2 (en) * | 1985-04-17 | 1993-10-19 | ||
| US4737086A (en) * | 1986-05-27 | 1988-04-12 | Diesel Kiki Co., Ltd. | Fuel injection pump having variable prestroke mechanism |
-
1986
- 1986-10-04 DE DE19863633899 patent/DE3633899A1/en not_active Withdrawn
-
1987
- 1987-09-04 DE DE8787112919T patent/DE3778629D1/en not_active Expired - Lifetime
- 1987-09-04 EP EP87112919A patent/EP0263304B1/en not_active Expired - Lifetime
- 1987-10-02 JP JP62248238A patent/JPS6390664A/en active Pending
- 1987-10-05 US US07/104,027 patent/US4811716A/en not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| EP0263304A2 (en) | 1988-04-13 |
| DE3633899A1 (en) | 1988-04-07 |
| EP0263304A3 (en) | 1989-04-19 |
| DE3778629D1 (en) | 1992-06-04 |
| JPS6390664A (en) | 1988-04-21 |
| US4811716A (en) | 1989-03-14 |
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