EP0475955B1 - Fuel injection pump for internal combustion engines - Google Patents

Fuel injection pump for internal combustion engines Download PDF

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Publication number
EP0475955B1
EP0475955B1 EP90906864A EP90906864A EP0475955B1 EP 0475955 B1 EP0475955 B1 EP 0475955B1 EP 90906864 A EP90906864 A EP 90906864A EP 90906864 A EP90906864 A EP 90906864A EP 0475955 B1 EP0475955 B1 EP 0475955B1
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EP
European Patent Office
Prior art keywords
fuel injection
injection pump
atmospheric pressure
lever
stop lever
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
Application number
EP90906864A
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German (de)
French (fr)
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EP0475955A1 (en
Inventor
Karl Konrath
Claus Koester
Wolf-Ruediger Walk
Karl-Friedrich Ruesseler
Helmut Tschoeke
Mohammad-Ali Khosrawi
Alfons Schoetz
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Robert Bosch GmbH
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Robert Bosch GmbH
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Publication of EP0475955A1 publication Critical patent/EP0475955A1/en
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Classifications

    • 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
    • F02D1/02—Controlling fuel-injection pumps, e.g. of high pressure injection type not restricted to adjustment of injection timing, e.g. varying amount of fuel delivered
    • 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
    • F02M59/447—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 means specially adapted to limit fuel delivery or to supply excess of fuel temporarily, e.g. for starting of the engine
    • 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
    • F02D1/02—Controlling fuel-injection pumps, e.g. of high pressure injection type not restricted to adjustment of injection timing, e.g. varying amount of fuel delivered
    • F02D1/06—Controlling fuel-injection pumps, e.g. of high pressure injection type not restricted to adjustment of injection timing, e.g. varying amount of fuel delivered by means dependent on pressure of engine working fluid
    • F02D1/065—Controlling fuel-injection pumps, e.g. of high pressure injection type not restricted to adjustment of injection timing, e.g. varying amount of fuel delivered by means dependent on pressure of engine working fluid of intake of air
    • 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
    • F02D1/02—Controlling fuel-injection pumps, e.g. of high pressure injection type not restricted to adjustment of injection timing, e.g. varying amount of fuel delivered
    • F02D1/08—Transmission of control impulse to pump control, e.g. with power drive or power assistance

Definitions

  • the invention relates to a fuel injection pump for internal combustion engines according to the preamble of claim 1.
  • Such a fuel injection pump is already known from DE-OS 34 30 141.
  • This fuel injection pump has a stop lever which is adjustable as a function of the atmospheric pressure by means of an air pressure control element via a transmission device, on which a control lever of the fuel injection pump serving as a fuel quantity adjustment element comes into contact at full load.
  • the air pressure actuator consists of two diaphragm boxes connected in series, which change their length depending on the atmospheric pressure. This change in length is transmitted to the stop lever via the transmission device, which has two disks that can be coupled to one another.
  • a locking mechanism is assigned to the transmission device, which locks it against the force of the stop lever. The entire arrangement with the air pressure actuator and the transmission device and the locking mechanism thus consists of many individual parts and is complex to manufacture and assemble.
  • a control device for a fuel injection pump is known from FR-A 1 385 894, which has, among other things, a device for controlling the maximum fuel injection quantity as a function of atmospheric pressure.
  • This device acts on a control piston, which limits the possible path of a control rod in the direction of increasing fuel injection quantity via a lever.
  • the device acts on the control piston in the sense of reducing the maximum fuel injection quantity.
  • the device has a barometer socket, which is provided with an electrical switch, through which an electromagnet and a slide which can be actuated by it is switched.
  • the slide controls the pressure in a hydraulic circuit, which acts on the control piston via several additional hydraulic switching elements by opening or closing the connection of the control piston to a pressure source.
  • the electromagnet is not energized when the switch is open and the slide is in a position in which the connection of the control piston to the pressure source is interrupted.
  • the barometer socket expands so much that the circuit of the electromagnet is closed by the switch. The slide is moved into a position in which the control piston is connected to the pressure source and is moved into a position corresponding to a lower maximum fuel injection quantity. This device is therefore very complex.
  • a fuel injection pump is known from EP-A1-0 080 113, which has a stop lever that can be adjusted as a function of atmospheric pressure to limit the maximum fuel injection quantity.
  • the stop lever is supported by a pin on a contour on the outer circumference of an actuating piston.
  • the actuating piston is acted upon on one side by the speed-dependent control pressure prevailing in the suction chamber of the fuel injection pump and on its other side is acted upon by a control pressure, which is determined by the position of a control slide of a pressure control valve and is dependent on the boost pressure of the internal combustion engine operated by the fuel injection pump, and an equivalent spring.
  • a barometer box acts on the control spool of the pressure control valve and moves the control spool in dependence on the atmospheric pressure, with different outflow cross-sections in the relief line being released by the control spool depending on its position.
  • the outflow cross section of the pressure control valve is reduced, so that the control pressure increases and the actuating piston is displaced by the control pressure and the spring against the suction chamber pressure and the stop lever is adjusted in the direction of a lower maximum fuel injection quantity.
  • the pressure control valve and the control piston with the contour on its outer circumference are very expensive to manufacture.
  • the fuel injection pump according to the invention with the characterizing features of claim 1 has the advantage that the stop lever is adjustable depending on atmospheric pressure with simple means.
  • FIG. 1 An embodiment of the invention is shown in the drawing and explained in more detail in the following description.
  • the figure shows a fuel injection pump as a longitudinal section.
  • a fuel injection pump of the distributor type has a pump piston 12 which works in a cylinder bore 11 of a housing 10 and which, via a drive shaft 34, sets both a reciprocating and a simultaneously rotating movement of a cam drive consisting of a roller ring 13 and a front cam disk 14 becomes.
  • a pump working chamber 15 formed by the pump piston 12 in the cylinder bore 11 is filled during the suction stroke of the pump piston 12 via a suction bore 16 and control grooves 17 in the pump piston 12 and during the pressure stroke of the pump piston 12 with a closed suction bore 16 via a longitudinal bore 18 and a distributor groove 19 connected to it.
  • the delivery end is reached when a transverse bore 23 of the pump piston 12 connected to the longitudinal bore 18 is opened by an axially displaceable control slide 24 and the pump work space is relieved to an interior 25.
  • the fuel supplied to the pump working chamber 15 via the suction bore 16 is taken from the interior 25 of the injection pump, which serves as the suction chamber, and into which the fuel which is controlled by the control slide 24 from the transverse bore 23 can flow back.
  • the interior 25 is supplied with fuel from a reservoir by a feed pump, not shown.
  • a fuel quantity adjustment device has a centrifugal weight speed controller 32, which is set in a rotary movement by the drive shaft 34 in a manner not shown in more detail and which actuates the control slide 24 via a control sleeve 35 and a control lever 36.
  • a control spring 39 also acts on the control lever 36 and is articulated on a speed adjustment lever 40 connected to the accelerator pedal.
  • the control lever 36 can be referred to as a fuel quantity adjusting element.
  • the axial position of the control slide 24 set by the control lever 36 determines the end of delivery and thus the injection quantity of the fuel injection pump. In the illustrated full load position of the regulator lever 36, this rests against a stop lever 41.
  • the stop lever 41 is designed with two arms and is rotatably mounted on a bolt 43.
  • An adjusting device has a working element 44 inserted into a sleeve 45 screwed into the housing 10 and designed as an expansion element, which rests with one side of a collar 46 in the sleeve 45 and from which a pin 42 to the stop lever 41 through the sleeve 45 into the Interior 25 protrudes.
  • the Working element 44 is pressed towards the stop lever 41 by a spring 47 which is supported on a cover part 48 inserted into the sleeve 45 and which acts on the other side of the collar 46 on the working element 44.
  • the sleeve 45 and the cover part 48 are each fixed to the housing 10 and the sleeve 45 by means of a lock nut.
  • the position of the working element 44 can be adjusted by the sleeve 45.
  • a screw serving as counter stop 49 is screwed into the housing 10 and is fixed on the housing 10 by means of a lock nut 50.
  • the working element 44 is connected to an electrical circuit 52, which is closed or opened by a switching element 53 which is acted upon by atmospheric pressure, depending on the atmospheric pressure.
  • the switching element 53 is designed as a height switch with a membrane socket 54, which closes a contact in the switching element 53 when expanded.
  • the diaphragm box 54 closes the circuit 52 and the working element 44 is heated. With increasing temperature, the working element 44 expands and, via its pin 42, rotates the stop lever 41 in the direction of decreasing fuel injection quantity. In order to limit the rotation of the stop lever 41, it comes into contact with the counter stop 49 after a certain rotation. A further expansion of the working element 44 that is still taking place is possible against the spring 47 toward the cover part 48.
  • the switching element 53 opens the circuit 52 again due to an increased atmospheric pressure, the length of the working element 44 decreases as a result of cooling and the stop lever 41 is adjusted in the direction of increasing fuel injection quantity.

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • High-Pressure Fuel Injection Pump Control (AREA)
  • Fuel-Injection Apparatus (AREA)

Abstract

A fuel injection pump for internal combustion engines with a control lever (36) acting as a fuel quantity adjuster which, on full load, butts against one arm of a swivelling, two-armed stop lever (41). The other arm of the lever is supported on an operating member (44) which can be electrically heated and changes its position depending on the temperature. The operating member (44) is included in an electric circuit (52) which is closed by a switching component (53) subjected to atmospheric pressure when that pressure drops below a given value. The movement of the stop lever (41) caused by the operating member is limited to a predetermined value by a counter-stop (49).

Description

Stand der TechnikState of the art

Die Erfindung geht aus von einer Kraftstoffeinspritzpumpe für Brennkraftmaschinen nach der Gattung des Anspruchs 1.The invention relates to a fuel injection pump for internal combustion engines according to the preamble of claim 1.

Eine solche Kraftstoffeinspritzpumpe ist bereits durch die DE-OS 34 30 141 bekannt. Diese Kraftstoffeinspritzpumpe weist einen in Abhängigkeit vom Atmosphärendruck durch ein Luftdruckstellglied über eine Übertragungseinrichtung verstellbaren Anschlaghebel auf, an dem ein als Kraftstoffmengenverstellglied dienender Reglerhebel der Kraftstoffeinspritzpumpe bei Vollast zur Anlage kommt. Das Luftdruckstellglied besteht dabei aus zwei hintereinander geschalteten Membrandosen, die in Abhängigkeit vom Atmosphärendruck ihre Länge ändern. Diese Längenänderung wird über die Übertragungseinrichtung, die zwei schleppbar miteinander gekoppelte Scheiben aufweist, auf den Anschlaghebel übertragen. Der Übertragungseinrichtung ist ein Gesperre zugeordnet, das diese entgegen der Krafteinwirkung des Anschlaghebels verriegelt. Die gesamte Anordnung mit dem Luftdruckstellglied und der Übertragungseinrichtung sowie dem Gesperre besteht somit aus vielen Einzelteilen und ist aufwendig zu fertigen und zu montieren.Such a fuel injection pump is already known from DE-OS 34 30 141. This fuel injection pump has a stop lever which is adjustable as a function of the atmospheric pressure by means of an air pressure control element via a transmission device, on which a control lever of the fuel injection pump serving as a fuel quantity adjustment element comes into contact at full load. The air pressure actuator consists of two diaphragm boxes connected in series, which change their length depending on the atmospheric pressure. This change in length is transmitted to the stop lever via the transmission device, which has two disks that can be coupled to one another. A locking mechanism is assigned to the transmission device, which locks it against the force of the stop lever. The entire arrangement with the air pressure actuator and the transmission device and the locking mechanism thus consists of many individual parts and is complex to manufacture and assemble.

Durch die FR-A 1 385 894 ist eine Regeleinrichtung für eine Kraftstoffeinspritzpumpe bekannt, die unter anderem eine Einrichtung zur Regelung der maximalen Kraftstoffeinspritzmenge in Abhängigkeit vom Atmosphärendruck aufweist. Diese Einrichtung wirkt auf einen Regelkolben ein, der über einen Hebel den möglichen Weg einer Regelstange in Richtung zunehmender Kraftstoffeinspritzmenge begrenzt. Bei abnehmendem Atmosphärendruck wirkt die Einrichtung im Sinne einer Reduzierung der maximalen Kraftstoffeinspritzmenge auf den Regelkolben ein. Die Einrichtung weist eine Barometerdose auf, die mit einem elektrischen Schalter versehen ist, durch den ein Elektromagnet und ein durch diesen betätigbarer Schieber geschaltet wird. Durch den Schieber wird der Druck in einem Hydraulikkreis gesteuert der über mehrere zusätzliche hydraulische Schaltelemente auf den Regelkolben wirkt, indem die Verbindung des Regelkolbens mit einer Druckquelle geöffnet bzw. geschlossen wird. Solange der Atmosphärendruck über einem bestimmten Wert liegt, ist dabei der Elektromagnet bei geöffnetem Schalter nicht bestromt und der Schieber steht in einer Stellung, in der die Verbindung des Regelkolbens zur Druckquelle unterbrochen ist. Bei unter den bestimmten Wert absinkendem Atmosphärendruck dehnt sich die Barometerdose so stark aus, daß der Stromkreis des Elektromagneten durch den Schalter geschlossen wird. Der Schieber wird dabei in eine Stellung verschoben, in der der Regelkolben mit der Druckquelle verbunden ist und in eine einer geringeren maximalen Kraftstoffeinspritzmenge entsprechende Stellung verschoben wird. Diese Einrichtung ist somit sehr aufwendig.A control device for a fuel injection pump is known from FR-A 1 385 894, which has, among other things, a device for controlling the maximum fuel injection quantity as a function of atmospheric pressure. This device acts on a control piston, which limits the possible path of a control rod in the direction of increasing fuel injection quantity via a lever. When the atmospheric pressure decreases, the device acts on the control piston in the sense of reducing the maximum fuel injection quantity. The device has a barometer socket, which is provided with an electrical switch, through which an electromagnet and a slide which can be actuated by it is switched. The slide controls the pressure in a hydraulic circuit, which acts on the control piston via several additional hydraulic switching elements by opening or closing the connection of the control piston to a pressure source. As long as the atmospheric pressure is above a certain value, the electromagnet is not energized when the switch is open and the slide is in a position in which the connection of the control piston to the pressure source is interrupted. When the atmospheric pressure drops below the specified value, the barometer socket expands so much that the circuit of the electromagnet is closed by the switch. The slide is moved into a position in which the control piston is connected to the pressure source and is moved into a position corresponding to a lower maximum fuel injection quantity. This device is therefore very complex.

Weiterhin ist durch die EP-A1-0 080 113 eine Kraftstoffeinspritzpumpe bekannt, die einen in Abhängigkeit vom Atmosphärendruck verstellbaren Anschlaghebel zur Begrenzung der maximalen Kraftstoffeinspritzmenge aufweist. Der Anschlaghebel stützt sich über einen Stift an einer Kontur am Außenumfang eines Stellkolbens ab. Der Stellkolben ist auf seiner einen Seite vom im Saugraum der Kraftstoffeinspritzpumpe herrschenden drehzahlabhängigen Steuerdruck beaufschlagt und auf seiner anderen Seite von einem durch die Stellung eines Steuerschiebers eines Drucksteuerventils bestimmten, vom Ladedruck der mit der Kraftstoffeinspritzpumpe betriebenen Brennkraftmaschine abhängigen Steuerdruck und eine gleichwirkende Feder beaufschlagt. Auf den Steuerschieber des Drucksteuerventils wirkt dabei eine Barometerdose, die den Steuerschieber in Abhängigkeit vom Atmosphärendruck verschiebt, wobei durch den Steuerschieber in Abhängigkeit von dessen Stellung unterschiedliche Abströmquerschnitte in der Entlastungsleitung freigegeben werden. Bei einer Abnahme des Atmosphärendrucks wird dabei der Abströmquerschnitt des Drucksteuerventils verkleinert, so daß der Steuerdruck zunimmt und der Stellkolben durch den Steuerdruck und die Feder bewirkt gegen den Saugraumdruck verschoben wird und der Anschlaghebel in Richtung einer geringeren maximalen Kraftstoffeinspritzmenge verstellt wird. Das Drucksteuerventil und der Stellkolben mit der Kontur an dessen Außenumfang sind dabei sehr aufwendig zu fertigen.Furthermore, a fuel injection pump is known from EP-A1-0 080 113, which has a stop lever that can be adjusted as a function of atmospheric pressure to limit the maximum fuel injection quantity. The stop lever is supported by a pin on a contour on the outer circumference of an actuating piston. The actuating piston is acted upon on one side by the speed-dependent control pressure prevailing in the suction chamber of the fuel injection pump and on its other side is acted upon by a control pressure, which is determined by the position of a control slide of a pressure control valve and is dependent on the boost pressure of the internal combustion engine operated by the fuel injection pump, and an equivalent spring. A barometer box acts on the control spool of the pressure control valve and moves the control spool in dependence on the atmospheric pressure, with different outflow cross-sections in the relief line being released by the control spool depending on its position. When the atmospheric pressure decreases, the outflow cross section of the pressure control valve is reduced, so that the control pressure increases and the actuating piston is displaced by the control pressure and the spring against the suction chamber pressure and the stop lever is adjusted in the direction of a lower maximum fuel injection quantity. The pressure control valve and the control piston with the contour on its outer circumference are very expensive to manufacture.

Vorteile der ErfindungAdvantages of the invention

Die erfindungsgemäße Kraftstoffeinspritzpumpe mit den kennzeichnenden Merkmalen des Anspruchs 1 hat den Vorteil, daß mit einfachen Mitteln der Anschlaghebel in Abhängigkeit vom Atmosphärendruck verstellbar ist.The fuel injection pump according to the invention with the characterizing features of claim 1 has the advantage that the stop lever is adjustable depending on atmospheric pressure with simple means.

In den Unteransprüchen sind vorteilhafte Ausgestaltungen und Weiterbildungen der Kraftstoffeinspritzpumpe gekennzeichnet.Advantageous refinements and developments of the fuel injection pump are characterized in the subclaims.

Zeichnungdrawing

Ein Ausführungsbeispiel der Erfindung ist in der Zeichnung dargestellt und in der nachfolgenden Beschreibung näher erläutert. Die Figur zeigt eine Kraftstoffeinspritzpumpe als Längsschnitt.An embodiment of the invention is shown in the drawing and explained in more detail in the following description. The figure shows a fuel injection pump as a longitudinal section.

Beschreibung des AusführungsbeispielsDescription of the embodiment

Eine Kraftstoffeinspritzpumpe der Verteilerbauart weist einen in einer Zylinderbohrung 11 eines Gehäuses 10 arbeitenden Pumpenkolben 12 auf, der über eine Antriebswelle 34 von einem aus einem Rollenring 13 und einer Stirnnockenscheibe 14 bestehenden Nockentrieb sowohl in eine hin- und hergehende als auch gleichzeitig in eine rotierende Bewegung versetzt wird. Ein vom Pumpenkolben 12 in der Zylinderbohrung 11 gebildeter Pumpenarbeitsraum 15 wird beim Saughub des Pumpenkolbens 12 über eine Saugbohrung 16 und Steuernuten 17 im Pumpenkolben 12 gefüllt und beim Druckhub des Pumpenkolbens 12 bei abgeschlossener Saugbohrung 16 über eine Längsbohrung 18 und eine mit dieser verbundene Verteilernut 19, über ein Druckventil 21 und eine Druckleitung 22 zu einer nicht dargestellten Einspritzdüse an einem Zylinder der mit der Kraftstoffeinspritzpumpe betriebenen Brennkraftmaschine gefördert. Das Förderende wird erreicht, wenn eine mit der Längsbohrung 18 verbundene Querbohrung 23 des Pumpenkolbens 12 von einem axial verschiebbaren Regelschieber 24 aufgesteuert und der Pumpenarbeitsraum zu einem Innenraum 25 entlastet wird. Der über die Saugbohrung 16 dem Pumpenarbeitsraum 15 zugeführte Kraftstoff wird dem als Saugraum dienenden Innenraum 25 der Einspritzpumpe entnommen, in den auch der vom Regelschieber 24 aus der Querbohrung 23 abgesteuerte Kraftstoff zurückfließen kann. Dem Innenraum 25 wird von einer nicht dargestellten Förderpumpe Kraftstoff aus einem Vorratsbehälter zugeführt.A fuel injection pump of the distributor type has a pump piston 12 which works in a cylinder bore 11 of a housing 10 and which, via a drive shaft 34, sets both a reciprocating and a simultaneously rotating movement of a cam drive consisting of a roller ring 13 and a front cam disk 14 becomes. A pump working chamber 15 formed by the pump piston 12 in the cylinder bore 11 is filled during the suction stroke of the pump piston 12 via a suction bore 16 and control grooves 17 in the pump piston 12 and during the pressure stroke of the pump piston 12 with a closed suction bore 16 via a longitudinal bore 18 and a distributor groove 19 connected to it. via a pressure valve 21 and a Pressure line 22 is conveyed to an injection nozzle (not shown) on a cylinder of the internal combustion engine operated with the fuel injection pump. The delivery end is reached when a transverse bore 23 of the pump piston 12 connected to the longitudinal bore 18 is opened by an axially displaceable control slide 24 and the pump work space is relieved to an interior 25. The fuel supplied to the pump working chamber 15 via the suction bore 16 is taken from the interior 25 of the injection pump, which serves as the suction chamber, and into which the fuel which is controlled by the control slide 24 from the transverse bore 23 can flow back. The interior 25 is supplied with fuel from a reservoir by a feed pump, not shown.

Eine Kraftstoffmengenverstelleinrichtung weist einen Fliehgewicht-Drehzahlregler 32 auf, der in nicht näher dargestellter Weise von der Antriebswelle 34 in eine Drehbewegung versetzt wird und der über eine Reglermuffe 35 und einen Reglerhebel 36 den Regelschieber 24 betätigt. Auf den Reglerhebel 36 wirkt ferner eine Regelfeder 39, die an einem mit dem Gaspedal verbundenen Drehzahlverstellhebel 40 angelenkt ist. In dieser Funktion kann der Reglerhebel 36 als Kraftstoffmengenverstellglied bezeichnet werden. Die vom Reglerhebel 36 eingestellte axiale Lage des Regelschiebers 24 bestimmt das Förderende und damit die Einspritzmenge der Kraftstoffeinspritzpumpe. In der dargestellten Vollaststellung des Reglerhebels 36 liegt dieser an einem Anschlaghebel 41 an.A fuel quantity adjustment device has a centrifugal weight speed controller 32, which is set in a rotary movement by the drive shaft 34 in a manner not shown in more detail and which actuates the control slide 24 via a control sleeve 35 and a control lever 36. A control spring 39 also acts on the control lever 36 and is articulated on a speed adjustment lever 40 connected to the accelerator pedal. In this function, the control lever 36 can be referred to as a fuel quantity adjusting element. The axial position of the control slide 24 set by the control lever 36 determines the end of delivery and thus the injection quantity of the fuel injection pump. In the illustrated full load position of the regulator lever 36, this rests against a stop lever 41.

Der Anschlaghebel 41 ist zweiarmig ausgebildet und auf einem Bolzen 43 drehbar gelagert. Eine Verstelleinrichtung weist ein in eine in das Gehäuse 10 eingeschraubte Hülse 45 eingesetztes, als Dehnstoffgeber ausgeführtes Arbeitselement 44 auf, das mit einer Seite eines Bundes 46 in der Hülse 45 anliegt und von dem ein Stift 42 zum Anschlaghebel 41 hin durch die Hülse 45 in den Innenraum 25 ragt. Das Arbeitselement 44 wird durch eine Feder 47, die sich an einem in die Hülse 45 eingesetzten Deckelteil 48 abstützt und die auf der anderen Seite des Bundes 46 am Arbeitselement 44 angreift, zum Anschlaghebel 41 hin gedrückt. Die Hülse 45 sowie das Deckelteil 48 sind mittels je einer Kontermutter am Gehäuse 10 bzw. der Hülse 45 festgelegt. Durch die Hülse 45 ist eine Einstellung der Position des Arbeitselements 44 möglich. Auf der dem Stift 42 gegenüberliegenden Seite des Anschlaghebels 41 ist in das Gehäuse 10 eine als Gegenanschlag 49 dienende Schraube eingeschraubt, die mittels einer Kontermutter 50 am Gehäuse 10 festgelegt ist. Das Arbeitselement 44 ist in einen elektrischen Schaltkreis 52 eingeschaltet, der durch ein vom Atmosphärendruck beaufschlagtes Schaltglied 53 in Abhängigkeit vom Atmosphärendruck geschlossen bzw. geöffnet wird. Das Schaltglied 53 ist als ein Höhenschalter mit einer Membrandose 54 ausgeführt, die bei Ausdehnung einen Kontakt im Schaltglied 53 schließt. Wenn der sich mit der Höhe, in der die mit der Kraftstoffeinspritzpumpe versorgte Fahrzeugbrennkraftmaschine betrieben wird, oder sich anderweitig ändernde Atmosphärendruck einen durch die Auslegung der Membrandose 54 bestimmten Wert unterschreitet, so schließt die Membrandose 54 den Schaltkreis 52 und das Arbeitselement 44 wird beheizt. Mit zunehmender Temperatur dehnt sich das Arbeitselement 44 aus und verdreht über seinen Stift 42 den Anschlaghebel 41 in Richtung abnehmender Kraftstoffeinspritzmenge. Um die Verdrehung des Anschlaghebels 41 zu begrenzen, kommt dieser nach einer bestimmten Verdrehung am Gegenanschlag 49 zur Anlage. Eine dann noch stattfindende weitere Ausdehnung des Arbeitselements 44 ist gegen die Feder 47 zum Deckelteil 48 hin möglich. Wenn das Schaltglied 53 infolge eines gestiegenen Atmosphärendrucks den Schaltkreis 52 wieder öffnet, so nimmt die Länge des Arbeitselements 44 infolge Abkühlung ab und der Anschlaghebel 41 wird in Richtung zunehmender Kraftstoffeinspritzmenge verstellt.The stop lever 41 is designed with two arms and is rotatably mounted on a bolt 43. An adjusting device has a working element 44 inserted into a sleeve 45 screwed into the housing 10 and designed as an expansion element, which rests with one side of a collar 46 in the sleeve 45 and from which a pin 42 to the stop lever 41 through the sleeve 45 into the Interior 25 protrudes. The Working element 44 is pressed towards the stop lever 41 by a spring 47 which is supported on a cover part 48 inserted into the sleeve 45 and which acts on the other side of the collar 46 on the working element 44. The sleeve 45 and the cover part 48 are each fixed to the housing 10 and the sleeve 45 by means of a lock nut. The position of the working element 44 can be adjusted by the sleeve 45. On the side of the stop lever 41 opposite the pin 42, a screw serving as counter stop 49 is screwed into the housing 10 and is fixed on the housing 10 by means of a lock nut 50. The working element 44 is connected to an electrical circuit 52, which is closed or opened by a switching element 53 which is acted upon by atmospheric pressure, depending on the atmospheric pressure. The switching element 53 is designed as a height switch with a membrane socket 54, which closes a contact in the switching element 53 when expanded. If the atmospheric pressure at which the vehicle internal combustion engine supplied with the fuel injection pump is operated or otherwise changes falls below a value determined by the design of the diaphragm box 54, the diaphragm box 54 closes the circuit 52 and the working element 44 is heated. With increasing temperature, the working element 44 expands and, via its pin 42, rotates the stop lever 41 in the direction of decreasing fuel injection quantity. In order to limit the rotation of the stop lever 41, it comes into contact with the counter stop 49 after a certain rotation. A further expansion of the working element 44 that is still taking place is possible against the spring 47 toward the cover part 48. When the switching element 53 opens the circuit 52 again due to an increased atmospheric pressure, the length of the working element 44 decreases as a result of cooling and the stop lever 41 is adjusted in the direction of increasing fuel injection quantity.

Claims (4)

  1. Fuel injection pump for internal combustion engines, having a fuel quantity adjusting element (36) and, associated with the latter, an adjusting device for changing the possible path of the fuel quantity adjusting element (36) as a function of atmospheric pressure, which adjusting device has a rotatably supported stop lever (41) on which the fuel quantity adjusting element (36) can be brought into contact, the adjusting device having an electrical switch (53) arranged in an electrical switching circuit (52) and acted upon by atmospheric pressure, which switch controls a working element (44) acting on the stop lever (41) as a function of atmospheric pressure, the switch (53) being actuated when a certain atmospheric pressure is exceeded and the switch circuit (52) being opened or closed, characterized in that the working element (44) is included in the electrical switching circuit (52) and the stop lever (41), which is configured with two arms, is moved by the working element (44), when the switching circuit (52) is closed due to the flow of current, from a first position into a second position defined by the contact between the stop lever (41) and an opposing stop (49).
  2. Fuel injection pump according to Claim 1, characterized in that the working element (44) is configured as an expanding material element and changes its length as a function of temperature.
  3. Fuel injection pump according to Claim 2, characterized in that the working element (44) is supported by means of a spring (47) on its end opposite to the support lever (41).
  4. Fuel injection pump according to one of the preceding claims, characterized in that the opposing stop (49) is adjustable.
EP90906864A 1989-06-10 1990-05-15 Fuel injection pump for internal combustion engines Expired - Lifetime EP0475955B1 (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
DE3919064 1989-06-10
DE3919064A DE3919064A1 (en) 1989-06-10 1989-06-10 FUEL INJECTION PUMP FOR INTERNAL COMBUSTION ENGINES
PCT/DE1990/000353 WO1990015233A1 (en) 1989-06-10 1990-05-15 Fuel injection pump for internal combustion engines

Publications (2)

Publication Number Publication Date
EP0475955A1 EP0475955A1 (en) 1992-03-25
EP0475955B1 true EP0475955B1 (en) 1994-04-06

Family

ID=6382539

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Application Number Title Priority Date Filing Date
EP90906864A Expired - Lifetime EP0475955B1 (en) 1989-06-10 1990-05-15 Fuel injection pump for internal combustion engines

Country Status (8)

Country Link
US (1) US5233957A (en)
EP (1) EP0475955B1 (en)
JP (1) JPH04505786A (en)
KR (1) KR0155562B1 (en)
BR (1) BR9007430A (en)
DE (2) DE3919064A1 (en)
ES (1) ES2052257T3 (en)
WO (1) WO1990015233A1 (en)

Family Cites Families (13)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2965089A (en) * 1957-05-27 1960-12-20 Holley Carburetor Co Cold start means for an internal combustion engine
FR1385894A (en) * 1964-03-06 1965-01-15 Maybach Motorenbau Gmbh Fuel flow limitation device for internal combustion engines
US3311102A (en) * 1964-11-10 1967-03-28 Bosch Arma Corp Excess fuel starting device for fuel injection engines
DE2731913A1 (en) * 1977-07-14 1979-02-01 Daimler Benz Ag IDLE ADJUSTMENT DEVICE FOR INJECTION PUMPS, IN PARTICULAR DIESEL INJECTION PUMPS
DE2854422A1 (en) * 1978-12-16 1980-07-03 Bosch Gmbh Robert FUEL INJECTION SYSTEM FOR DIESEL INTERNAL COMBUSTION ENGINES, ESPECIALLY FOR VEHICLE DIESEL ENGINES
JPS5773335U (en) * 1980-10-22 1982-05-06
JPS6128028Y2 (en) * 1981-05-14 1986-08-20
DE3146499A1 (en) * 1981-11-24 1983-06-01 Robert Bosch Gmbh, 7000 Stuttgart FUEL INJECTION PUMP FOR INTERNAL COMBUSTION ENGINES
JPS58133429A (en) * 1982-02-02 1983-08-09 Mazda Motor Corp Controller of fuel injection quantity in diesel engine
DE3243349A1 (en) * 1982-11-24 1984-05-24 Robert Bosch Gmbh, 7000 Stuttgart FUEL INJECTION PUMP
DE3322214A1 (en) * 1983-06-21 1985-01-10 Robert Bosch Gmbh, 7000 Stuttgart Injection pump for internal-combustion engines
DE3430141A1 (en) * 1984-08-16 1986-02-27 Robert Bosch Gmbh, 7000 Stuttgart FUEL INJECTION SYSTEM FOR DIESEL INTERNAL COMBUSTION ENGINES, ESPECIALLY FOR VEHICLE DIESEL ENGINES
DE3433423A1 (en) * 1984-09-12 1986-03-20 Robert Bosch Gmbh, 7000 Stuttgart SPEED REGULATOR FOR FUEL INJECTION PUMPS

Also Published As

Publication number Publication date
US5233957A (en) 1993-08-10
EP0475955A1 (en) 1992-03-25
DE59005284D1 (en) 1994-05-11
JPH04505786A (en) 1992-10-08
DE3919064A1 (en) 1990-12-13
KR0155562B1 (en) 1998-11-16
BR9007430A (en) 1992-06-16
KR920701021A (en) 1992-08-10
ES2052257T3 (en) 1994-07-01
WO1990015233A1 (en) 1990-12-13

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