EP1076174A2 - Single cylinder high pressure pump - Google Patents

Single cylinder high pressure pump Download PDF

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Publication number
EP1076174A2
EP1076174A2 EP00116573A EP00116573A EP1076174A2 EP 1076174 A2 EP1076174 A2 EP 1076174A2 EP 00116573 A EP00116573 A EP 00116573A EP 00116573 A EP00116573 A EP 00116573A EP 1076174 A2 EP1076174 A2 EP 1076174A2
Authority
EP
European Patent Office
Prior art keywords
pump
cylinder
pressure pump
pressure
cylinder high
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
Application number
EP00116573A
Other languages
German (de)
French (fr)
Other versions
EP1076174B1 (en
EP1076174A3 (en
Inventor
Helmut Rembold
Peter Ropertz
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Robert Bosch GmbH
Original Assignee
Robert Bosch GmbH
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Publication date
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Publication of EP1076174A2 publication Critical patent/EP1076174A2/en
Publication of EP1076174A3 publication Critical patent/EP1076174A3/en
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Publication of EP1076174B1 publication Critical patent/EP1076174B1/en
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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
    • 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
    • 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
    • F02M63/00—Other fuel-injection apparatus having pertinent characteristics not provided for in groups F02M39/00 - F02M57/00 or F02M67/00; Details, component parts, or accessories of fuel-injection apparatus, not provided for in, or of interest apart from, the apparatus of groups F02M39/00 - F02M61/00 or F02M67/00; Combination of fuel pump with other devices, e.g. lubricating oil pump
    • F02M63/02—Fuel-injection apparatus having several injectors fed by a common pumping element, or having several pumping elements feeding a common injector; Fuel-injection apparatus having provisions for cutting-out pumps, pumping elements, or injectors; Fuel-injection apparatus having provisions for variably interconnecting pumping elements and injectors alternatively
    • F02M63/0225—Fuel-injection apparatus having a common rail feeding several injectors ; Means for varying pressure in common rails; Pumps feeding common rails
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
    • F04B1/00—Multi-cylinder machines or pumps characterised by number or arrangement of cylinders
    • F04B1/04—Multi-cylinder machines or pumps characterised by number or arrangement of cylinders having cylinders in star- or fan-arrangement
    • F04B1/0404—Details or component parts
    • F04B1/0421—Cylinders
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
    • F04B11/00—Equalisation of pulses, e.g. by use of air vessels; Counteracting cavitation
    • F04B11/0008—Equalisation of pulses, e.g. by use of air vessels; Counteracting cavitation using accumulators
    • F04B11/0016—Equalisation of pulses, e.g. by use of air vessels; Counteracting cavitation using accumulators with a fluid spring
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
    • F04B53/00—Component parts, details or accessories not provided for in, or of interest apart from, groups F04B1/00 - F04B23/00 or F04B39/00 - F04B47/00
    • F04B53/16—Casings; Cylinders; Cylinder liners or heads; Fluid connections
    • F04B53/162—Adaptations of cylinders
    • F04B53/166—Cylinder liners
    • F04B53/168—Mounting of cylinder liners in cylinders
    • 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
    • F02M2200/00—Details of fuel-injection apparatus, not otherwise provided for
    • F02M2200/30—Fuel-injection apparatus having mechanical parts, the movement of which is damped

Definitions

  • the invention relates to a single-cylinder high-pressure pump for High pressure supply in common rail injection systems from Internal combustion engines, with one in a pump housing recorded pump element, which is a pump piston includes, which is in a pump cylinder against the Preload force of a compression spring can be moved back and forth recorded and driven by a cam to with Pumping high pressure fuel into a rail.
  • the pump element from below, i.e. of the Cam drive side to insert into the pump housing and brace with a screw.
  • the contact surface for Absorption of the tensioning forces is on the upper side facing away from the cam drive Pump cylinder.
  • the tensile forces are over the full Length passed through the pump cylinder.
  • the Pump cylinder can be made of stainless steel and that Pump housing made of aluminum. Because of the different coefficients of thermal expansion of the different materials, it is required Increase the preload forces of the screw connection. This is the only way secure clamping in all operating conditions, e.g. from -40 ° C to + 140 ° C.
  • the high Preload forces can cause a banana-shaped deformation of the pump cylinder and thus to a clamping of the Guide the pump piston in operation.
  • the object of the invention is a single-cylinder high-pressure pump of the type described at the beginning with a provide longer life. Beyond that the single-cylinder high-pressure pump according to the invention is simple be built and inexpensive to manufacture.
  • the task is for a single-cylinder high-pressure pump High-pressure fuel supply in common rail injection systems of internal combustion engines, with an in a pump housing accommodated pump element, the one Pump piston includes the in a pump cylinder against the Preload force of a compression spring can be moved back and forth recorded and driven by a cam to with Pumping high pressure fuel into a rail solved in that on the remote from the cam drive Side in the pump housing an assembly opening for receiving of the pump element is provided.
  • a Supported by a flange at the lower end of the cylinder is not possible due to the limited installation space. A such support would be a much larger one Diameter of the pump cylinder require what would blow up the given space.
  • Another special embodiment of the invention is characterized in that on the by the cam drive opposite end of the pump cylinder formed a cone is in the assembled state of the high pressure pump a complementary cone in the pump housing cooperates.
  • the interacting cones ensure a particularly stable fixation of the pump cylinder in the Pump housing.
  • Another special embodiment of the invention is characterized in that the pump element in installed condition with the help of a locking element in the mounting opening for receiving the pump element is tense.
  • the closure element prevents loosening of the pump element in operation and can vary be constructed.
  • Another special embodiment of the invention is characterized in that on the closure element External thread is formed, with one on the Pump housing trained internal thread interacts.
  • the construction according to the invention ensures that the required in a given space Thread length for a permanent connection can be accommodated.
  • Another special embodiment of the invention is characterized in that the closure element with With the help of several screw connections on the pump housing is attached.
  • the screw connections can be made on one Pitch circle arranged to be concentric to that Pump cylinder is. This will loosen the Pump element safely prevented during operation.
  • the first embodiment shown in Fig. 1 Single-cylinder high-pressure pump according to the invention comprises a Pump housing 1.
  • the pump housing 1 of the high pressure pump is built into the housing 2 of an internal combustion engine.
  • a pump cylinder 4 is added in an elongated mounting opening 3 in the pump housing 1 .
  • a pump piston 5 can be moved back and forth added.
  • One end 6 of the pump piston 5 is by means of a Compression spring 7 against a cam 8 of a camshaft Engine biased.
  • the Compression spring 7 between two spring plates 9 and 10 clamped.
  • the spring plate 9 is based on that End of the pump cylinder 4 facing the cam drive.
  • the Spring plate 10 is at the end 6 of the pump piston 5 supported.
  • the end face 11 of the cam drive 8 which faces away from the cam drive 8 Pump piston 5 delimits a cylinder space 12 in the Pump cylinder 4.
  • the cylinder chamber 12 through one Closure element 13 delimits an inlet valve 14 is arranged.
  • the inlet valve 14 leads to the promotional fuel in the cylinder chamber 12. If the Pump piston 5 is moved into the cylinder space 12, the fuel in it is at high pressure acted upon. The high pressure fuel passes through an outlet valve 15 to the (not shown) Rail.
  • the closure element 13 has the shape of a cup, in the Bottom the inlet valve 14 is arranged. In the interior a pressure damper 17 is added to the cup.
  • the mounting opening 3 in the pump housing 1 has the shape a through hole with different Diameter sections. The smallest diameter is on the side facing the cam drive 8 and the largest diameter on that of the cam drive 8 facing away from the pump housing 1.
  • the second embodiment shown in FIG Invention largely corresponds to the first Embodiment. For the sake of simplicity, become Identical parts have the same reference numerals used. To avoid repetitions, the detailed description of the first above Exemplary embodiment with reference to FIG. 1.
  • FIG. 2 of the invention is that of the cam drive 8th opposite end of the pump cylinder 4 instead of the federal government Cone 20 formed.
  • the cone 20 works with one corresponding cone on the pump housing 1 together.
  • the Cone 20 on the pump cylinder 4 tapers to that Cam drive 8 back.
  • With the help of the closure element 13 the cone 20 is in contact with the corresponding Counter cone of the pump housing 1 held.
  • the Closure element 13 is in turn by means of screws 21 and 22 attached to the pump housing 1.

Landscapes

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

Abstract

The pump has a pump element in a pump housing (1) with a pump piston (5) reciprocally movable in a cylinder (4) against spring (7) bias force and driven by a cam (8) to feed fuel subject to high pressure into a rail. A mounting opening (3) for the pump element is arranged in the pump housing on the side remote from the cam drive.

Description

Stand der TechnikState of the art

Die Erfindung betrifft eine Einzylinder-Hochdruckpumpe zur Hochdruckversorgung in Common-Rail-Einspritzsystemen von Brennkraftmaschinen, mit einem in einem Pumpengehäuse aufgenommenen Pumpenelement, das einen Pumpenkolben umfasst, der in einem Pumpenzylinder gegen die Vorspannkraft einer Druckfeder hin und her bewegbar aufgenommen und durch einen Nocken angetrieben ist, um mit Hochdruck beaufschlagten Kraftstoff in ein Rail zu fördern.The invention relates to a single-cylinder high-pressure pump for High pressure supply in common rail injection systems from Internal combustion engines, with one in a pump housing recorded pump element, which is a pump piston includes, which is in a pump cylinder against the Preload force of a compression spring can be moved back and forth recorded and driven by a cam to with Pumping high pressure fuel into a rail.

Bei einer aktuellen Konstruktion der Anmelderin ist vorgesehen, das Pumpenelement von unten, d.h. von der Nockenantriebsseite her, in das Pumpengehäuse zu stecken und mit einer Schraube zu verspannen. Die Anlagefläche zur Aufnahme der Verspannkräfte befindet sich dabei an der oberen, von dem Nockenantrieb abgewandten Seite des Pumpenzylinders. Die Verspannkräfte werden über die volle Länge durch den Pumpenzylinder hindurchgeleitet. Der Pumpenzylinder kann aus einem nicht rostenden Stahl und das Pumpengehäuse aus Aluminium gefertigt sein. Wegen der unterschiedlichen Wärmeausdehnungskoeffizienten der verschiedenen Materialien ist es erforderlich, die Vorspannkräfte der Verschraubung zu erhöhen. Nur so kann eine sichere Verpannung in allen Betriebszuständen, z.B. von -40° C bis +140° C, gewährleistet werden. Die hohen Vorspannkräfte können zu einer bananenförmigen Verformung des Pumpenzylinders und damit zu einem Klemmen des Pumpenkolbens im Betrieb führen.With a current design the applicant is provided the pump element from below, i.e. of the Cam drive side to insert into the pump housing and brace with a screw. The contact surface for Absorption of the tensioning forces is on the upper side facing away from the cam drive Pump cylinder. The tensile forces are over the full Length passed through the pump cylinder. The Pump cylinder can be made of stainless steel and that Pump housing made of aluminum. Because of the different coefficients of thermal expansion of the different materials, it is required Increase the preload forces of the screw connection. This is the only way secure clamping in all operating conditions, e.g. from -40 ° C to + 140 ° C. The high Preload forces can cause a banana-shaped deformation of the pump cylinder and thus to a clamping of the Guide the pump piston in operation.

Aufgabe der Erfindung ist es, eine Einzylinder-Hochdruckpumpe der eingangs geschilderten Art mit einer längeren Lebensdauer bereitzustellen. Darüber hinaus soll die erfindungsgemäße Einzylinder-Hochdruckpumpe einfach aufgebaut und kostengünstig herstellbar sein.The object of the invention is a single-cylinder high-pressure pump of the type described at the beginning with a provide longer life. Beyond that the single-cylinder high-pressure pump according to the invention is simple be built and inexpensive to manufacture.

Die Aufgabe ist bei einer Einzylinder-Hochdruckpumpe zur Kraftstoffhochdruckversorgung in Common-Rail-Einspritzsystemen von Brennkraftmaschinen, mit einem in einem Pumpengehäuse aufgenommenen Pumpenelement, das einen Pumpenkolben umfasst, der in einem Pumpenzylinder gegen die Vorspannkraft einer Druckfeder hin und her bewegbar aufgenommen und durch einen Nocken angetrieben ist, um mit Hochdruck beaufschlagten Kraftstoff in ein Rail zu fördern, dadurch gelöst, dass auf der vom Nockenantrieb abgewandten Seite in dem Pumpengehäuse eine Montageöffnung zur Aufnahme des Pumpenelements vorgesehen ist. Im Rahmen der vorliegenden Erfindung hat sich herausgestellt, dass eine Abstützung über einen Flansch am unteren Ende des Zylinders wegen des begrenzten Bauraums nicht möglich ist. Eine derartige Abstützung würde einen deutlich größeren Durchmesser des Pumpenzylinders erforderlich machen, was den vorgegebenen Bauraum sprengen würde. Durch die erfindungsgemäße Umkehrung der Montagerichtung ist es nicht mehr erforderlich, die zur Fixierung benötigten Kräfte durch den Bereich des Pumpenzylinders zu führen, in dem der Pumpenkolben geführt und abgedichtet wird. Dadurch wird ein Klemmen des Pumpenkolbens aufgrund der Vorspannkräfte sicher verhindert.The task is for a single-cylinder high-pressure pump High-pressure fuel supply in common rail injection systems of internal combustion engines, with an in a pump housing accommodated pump element, the one Pump piston includes the in a pump cylinder against the Preload force of a compression spring can be moved back and forth recorded and driven by a cam to with Pumping high pressure fuel into a rail solved in that on the remote from the cam drive Side in the pump housing an assembly opening for receiving of the pump element is provided. As part of the The present invention has been found that a Supported by a flange at the lower end of the cylinder is not possible due to the limited installation space. A such support would be a much larger one Diameter of the pump cylinder require what would blow up the given space. Through the reversal of the assembly direction according to the invention is not more required, the forces required for fixation through the area of the pump cylinder in which the Pump piston is guided and sealed. This will make a Clamping of the pump piston due to the preload forces safely prevented.

Eine besondere Ausführungsart der Erfindung ist dadurch gekennzeichnet, dass an dem vom Nockenantrieb abgewandten Ende des Pumpenzylinders ein Bund ausgebildet ist, der im zusammengebauten Zustand der Hochdruckpumpe mit einer komplementären Stufe in dem Pumpengehäuse zusammenwirkt. Der Bund kommt bei der Montage des Pumpenelements an dem Pumpengehäuse zur Anlage und wird z.B. mit Hilfe einer Schraubverbindung fixiert. Diese Lösung ist fertigungstechnisch besonders einfach zu realisieren.This is a special embodiment of the invention characterized in that on the remote from the cam drive A collar is formed at the end of the pump cylinder assembled state of the high pressure pump with a complementary stage in the pump housing cooperates. The collar comes to the assembly of the pump element Pump housing to the system and is e.g. with the help of a Fixed screw connection. This solution is production-technically particularly easy to implement.

Eine weitere besondere Ausführungsart der Erfindung ist dadurch gekennzeichnet, dass an dem vom Nockenantrieb abgewandten Ende des Pumpenzylinders ein Konus ausgebildet ist, der im zusammengebauten Zustand der Hochdruckpumpe mit einem komplementären Konus in dem Pumpengehäuse zusammenwirkt. Die zusammenwirkenden Konusse sorgen für eine besonders stabile Fixierung des Pumpenzylinders in dem Pumpengehäuse.Another special embodiment of the invention is characterized in that on the by the cam drive opposite end of the pump cylinder formed a cone is in the assembled state of the high pressure pump a complementary cone in the pump housing cooperates. The interacting cones ensure a particularly stable fixation of the pump cylinder in the Pump housing.

Eine weitere besondere Ausführungsart der Erfindung ist dadurch gekennzeichnet, dass das Pumpenelement im eingebauten Zustand mit Hilfe eines Verschlusselements in der Montageöffnung zur Aufnahme des Pumpenelements verspannt ist. Das Verschlusselement verhindert ein Lösen des Pumpenelements im Betrieb und kann unterschiedlich aufgebaut sein.Another special embodiment of the invention is characterized in that the pump element in installed condition with the help of a locking element in the mounting opening for receiving the pump element is tense. The closure element prevents loosening of the pump element in operation and can vary be constructed.

Eine weitere besondere Ausführungsart der Erfindung ist dadurch gekennzeichnet, dass an dem Verschlusselement ein Außengewinde ausgebildet ist, das mit einem an dem Pumpengehäuse ausgebildeten Innengewinde zusammenwirkt. Durch die erfindungsgemäße Konstruktion ist sichergestellt, dass in einem vorgegebenen Bauraum die erforderliche Gewindelänge für eine dauerhaltbare Verbindung untergebracht werden kann.Another special embodiment of the invention is characterized in that on the closure element External thread is formed, with one on the Pump housing trained internal thread interacts. The construction according to the invention ensures that the required in a given space Thread length for a permanent connection can be accommodated.

Eine weitere besondere Ausführungsart der Erfindung ist dadurch gekennzeichnet, dass das Verschlusselement mit Hilfe von mehreren Schraubverbindungen an dem Pumpengehäuse befestigt ist. Die Schraubverbindungen können auf einem Lochkreis angeordnet sein, der konzentrisch zu dem Pumpenzylinder ist. Dadurch wird ein Lösen des Pumpenelements im Betrieb sicher verhindert.Another special embodiment of the invention is characterized in that the closure element with With the help of several screw connections on the pump housing is attached. The screw connections can be made on one Pitch circle arranged to be concentric to that Pump cylinder is. This will loosen the Pump element safely prevented during operation.

Weitere besondere Ausführungsarten der Erfindung sind dadurch gekennzeichnet, dass eine Druckdämpfungseinrichtung in das Verschlusselement und ein Einlassventil in das Verschlusselement oder den Pumpenzylinder integriert sind. Durch die Integration diverser Bauteile in das Verschlusselement bzw. den Pumpenzylinder wird eine äußerst kompakte Bauform der Hochdruckpumpe ermöglicht, die auch hohen Drücken standhält.Further special embodiments of the invention are characterized in that a pressure damping device in the closure element and an inlet valve in that Closure element or the pump cylinder are integrated. By integrating various components into the Closing element or the pump cylinder becomes an extreme compact design of the high pressure pump enables that too withstands high pressures.

Weitere Vorteile, Merkmale und Einzelheiten der Erfindung ergeben sich aus der nachfolgenden Beschreibung, in der unter Bezugnahme auf die Zeichnung zwei Ausführungsbeispiele der Erfindung im einzelnen beschrieben sind. Dabei können die in den Ansprüchen und in der Beschreibung erwähnten Merkmale jeweils einzeln für sich oder in beliebiger Kombination erfindungswesentlich sein. In der Zeichnung zeigen:

  • Fig. 1: ein erstes Ausführungsbeispiel einer erfindungsgemäßen Hochdruckpumpe im Längsschnitt; und
  • Fig. 2: einen Ausschnitt aus Fig. 1 gemäß einem zweiten Ausführungsbeispiel.
    • Further advantages, features and details of the invention emerge from the following description, in which two exemplary embodiments of the invention are described in detail with reference to the drawing. The features mentioned in the claims and in the description can each be essential to the invention individually or in any combination. The drawing shows:
  • 1: a first embodiment of a high-pressure pump according to the invention in longitudinal section; and
  • 2: a detail from FIG. 1 according to a second embodiment.

    • Das in Fig. 1 dargestellte erste Ausführungsbeispiel einer erfindungsgemäßen Einzylinder-Hochdruckpumpe umfasst ein Pumpengehäuse 1. Das Pumpengehäuse 1 der Hochdruckpumpe ist in das Gehäuse 2 einer Brennkraftmaschine eingebaut. In einer länglichen Montageöffnung 3 in dem Pumpengehäuse 1 ist ein Pumpenzylinder 4 aufgenommen. In dem Pumpenzylinder 4 wiederum ist ein Pumpenkolben 5 hin und her bewegbar aufgenommen.The first embodiment shown in Fig. 1 Single-cylinder high-pressure pump according to the invention comprises a Pump housing 1. The pump housing 1 of the high pressure pump is built into the housing 2 of an internal combustion engine. In an elongated mounting opening 3 in the pump housing 1 a pump cylinder 4 is added. In the pump cylinder 4, in turn, a pump piston 5 can be moved back and forth added.

    Ein Ende 6 des Pumpenkolbens 5 ist mit Hilfe einer Druckfeder 7 gegen einen Nocken 8 einer Nockenwelle der Brennkraftmaschine vorgespannt. Zu diesem Zweck ist die Druckfeder 7 zwischen zwei Federtellern 9 und 10 eingespannt. Der Federteller 9 stützt sich an dem zu dem Nockenantrieb gewandten Ende des Pumpenzylinders 4 ab. Der Federteller 10 ist an dem Ende 6 des Pumpenkolbens 5 abgestützt.One end 6 of the pump piston 5 is by means of a Compression spring 7 against a cam 8 of a camshaft Engine biased. For this purpose, the Compression spring 7 between two spring plates 9 and 10 clamped. The spring plate 9 is based on that End of the pump cylinder 4 facing the cam drive. The Spring plate 10 is at the end 6 of the pump piston 5 supported.

    Die von dem Nockenantrieb 8 abgewandte Stirnfläche 11 des Pumpenkolbens 5 begrenzt einen Zylinderraum 12 in dem Pumpenzylinder 4. Gegenüber der Stirnfläche 11 des Pumpenkolbens 5 ist der Zylinderraum 12 durch ein Verschlusselement 13 begrenzt, in dem ein Einlassventil 14 angeordnet ist. Durch das Einlassventil 14 gelangt der zu fördernde Kraftstoff in den Zylinderraum 12. Wenn der Pumpenkolben 5 in den Zylinderraum 12 hineinbewegt wird, wird der darin befindliche Kraftstoff mit Hochdruck beaufschlagt. Der mit Hochdruck beaufschlagte Kraftstoff gelangt über ein Auslassventil 15 zu dem (nicht dargestellten) Rail.The end face 11 of the cam drive 8 which faces away from the cam drive 8 Pump piston 5 delimits a cylinder space 12 in the Pump cylinder 4. Opposite the end face 11 of the Pump piston 5, the cylinder chamber 12 through one Closure element 13 delimits an inlet valve 14 is arranged. The inlet valve 14 leads to the promotional fuel in the cylinder chamber 12. If the Pump piston 5 is moved into the cylinder space 12, the fuel in it is at high pressure acted upon. The high pressure fuel passes through an outlet valve 15 to the (not shown) Rail.

    Mit Hilfe eines Magnetsteuerventils 16 kann die Fördermenge der Kraftstoffhochdruckpumpe eingestellt werden.With the help of a solenoid control valve 16, the delivery rate the high pressure fuel pump.

    Das Verschlusselement 13 hat die Form einer Tasse, in deren Boden das Einlassventil 14 angeordnet ist. In dem Innenraum der Tasse ist ein Druckdämpfer 17 aufgenommen.The closure element 13 has the shape of a cup, in the Bottom the inlet valve 14 is arranged. In the interior a pressure damper 17 is added to the cup.

    Bei dem ersten Ausführungsbeispiel ist an dem von dem Nockenantrieb 8 abgewandten Ende des Pumpenzylinders 4 ein Bund 18 ausgebildet. Der Bund 18 stützt sich an einer entsprechenden Stufe des Pumpengehäuses 1 ab. Über ein an dem Verschlusselement 13 ausgebildeten Gewinde 19 wird der Bund 18 des Pumpenzylinders 4 gegen das Pumpengehäuse 1 gedrückt. Auf diese Art und Weise wird der Pumpenzylinder 4 in dem Pumpengehäuse 1 fixiert.In the first embodiment, that of Cam drive 8 facing away from the end of the pump cylinder 4 Bund 18 trained. The federal government 18 is based on one corresponding stage of the pump housing 1. About one the closure element 13 formed thread 19 Collar 18 of the pump cylinder 4 against the pump housing 1 pressed. In this way, the pump cylinder 4 fixed in the pump housing 1.

    Die Montageöffnung 3 in dem Pumpengehäuse 1 hat die Form einer Durchgangsbohrung mit unterschiedlichen Durchmesserabschnitten. Der kleinste Durchmesser ist auf der zu dem Nockenantrieb 8 hingewandten Seite und der größte Durchmesser auf der von dem Nockenantrieb 8 abgewandten Seite des Pumpengehäuses 1 angeordnet.The mounting opening 3 in the pump housing 1 has the shape a through hole with different Diameter sections. The smallest diameter is on the side facing the cam drive 8 and the largest diameter on that of the cam drive 8 facing away from the pump housing 1.

    Das in Fig. 2 dargestellte zweite Ausführungsbeispiel der Erfindung entspricht weitgehend dem ersten Ausführungsbeispiel. Der Einfachheit halber werden zur Bezeichnung gleicher Teile dieselben Bezugszeichen verwendet. Um Wiederholungen zu vermeiden, wird auf die vorstehende ausführliche Beschreibung des ersten Ausführungsbeispiels unter Bezugnahme auf Fig. 1 verwiesen.The second embodiment shown in FIG Invention largely corresponds to the first Embodiment. For the sake of simplicity, become Identical parts have the same reference numerals used. To avoid repetitions, the detailed description of the first above Exemplary embodiment with reference to FIG. 1.

    Bei dem in Fig. 2 dargestellten zweiten Ausführungsbeispiel der Erfindung ist an dem von dem Nockenantrieb 8 abgewandten Ende des Pumpenzylinders 4 statt des Bundes ein Konus 20 ausgebildet. Der Konus 20 wirkt mit einem entsprechenden Konus an dem Pumpengehäuse 1 zusammen. Der Konus 20 an dem Pumpenzylinder 4 verjüngt sich zu dem Nockenantrieb 8 hin. Mit Hilfe des Verschlusselements 13 wird der Konus 20 in Anlage an den entsprechenden Gegenkonus des Pumpengehäuses 1 gehalten. Das Verschlusselement 13 wiederum ist mit Hilfe von Schrauben 21 und 22 an dem Pumpengehäuse 1 befestigt.In the second embodiment shown in FIG. 2 of the invention is that of the cam drive 8th opposite end of the pump cylinder 4 instead of the federal government Cone 20 formed. The cone 20 works with one corresponding cone on the pump housing 1 together. The Cone 20 on the pump cylinder 4 tapers to that Cam drive 8 back. With the help of the closure element 13 the cone 20 is in contact with the corresponding Counter cone of the pump housing 1 held. The Closure element 13 is in turn by means of screws 21 and 22 attached to the pump housing 1.

    Ein weiterer Unterschied zwischen den beiden Ausführungsbeispielen besteht darin, dass das Einlassventil 14 bei dem in Fig. 2 dargestellten zweiten Ausführungsbeispiel nicht in das Verschlusselement 13 sondern in das Ende des Pumpenzylinders 4 integriert ist. Ansonsten entspricht das zweite Ausführungsbeispiel dem ersten Ausführungsbeispiel.Another difference between the two Embodiments consist in that the inlet valve 14 in the second shown in Fig. 2 Embodiment not in the closure element 13 but is integrated into the end of the pump cylinder 4. Otherwise, the second embodiment corresponds to that first embodiment.

    Claims (9)

    Einzylinder-Hochdruckpumpe zur Hochdruckversorgung in Common-Rail-Einspritzsystemen von Brennkraftmaschinen, mit einem in einem Pumpengehäuse (1) aufgenommenen Pumpenelement, das einen Pumpenkolben (5) umfasst, der in einem Pumpenzylinder (4) gegen die Vorspannkraft einer Druckfeder (7) hin und her bewegbar aufgenommen und durch einen Nocken (8) angetrieben ist, um mit Hochdruck beaufschlagten Kraftstoff in ein Rail zu fördern, dadurch gekennzeichnet, dass auf der vom Nockenantrieb (8) abgewandten Seite in dem Pumpengehäuse (1) eine Montageöffnung (3) zur Aufnahme des Pumpenelements vorgesehen ist.Single-cylinder high-pressure pump for high-pressure supply in common rail injection systems of internal combustion engines, with a pump element accommodated in a pump housing (1), which comprises a pump piston (5), which moves back and forth in a pump cylinder (4) against the biasing force of a compression spring (7) is movably received and driven by a cam (8) to deliver high-pressure fuel into a rail, characterized in that an assembly opening (3) for receiving in the pump housing (1) on the side facing away from the cam drive (8) of the pump element is provided. Einzylinder-Hochdruckpumpe nach Anspruch 1, dadurch gekennzeichnet, dass an dem vom Nockenantrieb (8) abgewandten Ende des Pumpenzylinders (4) ein Bund (18) ausgebildet ist, der im zusammengebauten Zustand der Hochdruckpumpe mit einer komplementären Stufe in dem Pumpengehäuse (1) zusammenwirkt.Single-cylinder high-pressure pump according to claim 1, characterized characterized in that on the cam drive (8) opposite end of the pump cylinder (4) a collar (18) is formed, the in the assembled state of the High pressure pump with a complementary stage in the Pump housing (1) interacts. Einzylinder-Hochdruckpumpe nach Anspruch 1, dadurch gekennzeichnet, dass an dem vom Nockenantrieb (8) abgewandten Ende des Pumpenzylinders (4) ein Konus (20) ausgebildet ist, der im zusammengebauten Zustand der Hochdruckpumpe mit einem komplementären Konus in dem Pumpengehäuse (1) zusammenwirkt. Single-cylinder high-pressure pump according to claim 1, characterized characterized in that on the cam drive (8) opposite end of the pump cylinder (4) a cone (20) is formed, the in the assembled state of the High pressure pump with a complementary cone in the Pump housing (1) interacts. Einzylinder-Hochdruckpumpe nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, dass das Pumpenelement im eingebauten Zustand mit Hilfe eines Verschlusselements (13) in der Montageöffnung (3) zur Aufnahme des Pumpenelements verspannt ist.Single cylinder high pressure pump according to one of the previous claims, characterized in that the Pump element in the installed state using a Closure element (13) in the assembly opening (3) Recording the pump element is clamped. Einzylinder-Hochdruckpumpe nach Anspruch 4, dadurch gekennzeichnet, dass an dem Verschlusselement (13) ein Außengewinde (19) ausgebildet ist, das mit einem an dem Pumpengehäuse (1) ausgebildeten Innengewinde zusammenwirkt.Single-cylinder high-pressure pump according to claim 4, characterized characterized in that on the closure element (13) External thread (19) is formed, with one on the Pump housing (1) trained internal thread interacts. Einzylinder-Hochdruckpumpe nach Anspruch 4, dadurch gekennzeichnet, dass das Verschlusselement (13) mit Hilfe von mehreren Schraubverbindungen (21, 22) an dem Pumpengehäuse (1) befestigt ist.Single-cylinder high-pressure pump according to claim 4, characterized characterized in that the closure element (13) with the help of several screw connections (21, 22) on the Pump housing (1) is attached. Einzylinder-Hochdruckpumpe nach einem der Ansprüche 4 bis 6, dadurch gekennzeichnet, dass eine Druckdämpfungseinrichtung (17) in das Verschlusselement (13) integriert ist.Single-cylinder high-pressure pump according to one of claims 4 to 6, characterized in that a Pressure damping device (17) in the closure element (13) is integrated. Einzylinder-Hochdruckpumpe mach einem der Ansprüche 4 bis 7, dadurch gekennzeichnet, dass ein Einlassventil (14) in das Verschlusselement (13) integriert ist.Single-cylinder high-pressure pump make one of claims 4 to 7, characterized in that an inlet valve (14) is integrated in the closure element (13). Einzylinder-Hochdruckpumpe nach einem der Ansprüche 4 bis 7, dadurch gekennzeichnet, dass ein Einlassventil (14) in den Pumpenzylinder (4) integriert ist.Single-cylinder high-pressure pump according to one of claims 4 to 7, characterized in that an inlet valve (14) is integrated in the pump cylinder (4).
    EP20000116573 1999-08-13 2000-08-01 Single cylinder high pressure pump Expired - Lifetime EP1076174B1 (en)

    Applications Claiming Priority (2)

    Application Number Priority Date Filing Date Title
    DE19938504 1999-08-13
    DE1999138504 DE19938504A1 (en) 1999-08-13 1999-08-13 Single cylinder high pressure pump

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    EP1076174A2 true EP1076174A2 (en) 2001-02-14
    EP1076174A3 EP1076174A3 (en) 2003-11-19
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    EP1312801A2 (en) * 2001-11-16 2003-05-21 Robert Bosch Gmbh Fuel cooled pumping stage for high pressure fuel pump
    WO2009049776A1 (en) * 2007-10-15 2009-04-23 Ixetic Bad Homburg Gmbh Radial piston pump
    CN103717872A (en) * 2011-08-08 2014-04-09 德尔福技术控股有限公司 Fuel pump

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    EP1348864A4 (en) * 2001-01-05 2005-03-16 Hitachi Ltd High-pressure fuel feed pump
    DE10322603B4 (en) * 2003-05-20 2013-04-25 Robert Bosch Gmbh Piston pump, in particular high-pressure piston pump for internal combustion engines with direct injection
    DE10362375B3 (en) * 2003-05-20 2016-11-17 Robert Bosch Gmbh High-pressure piston pump for internal combustion engines with direct injection
    DE102004063074B4 (en) * 2004-12-28 2013-03-07 Robert Bosch Gmbh Piston pump, in particular high-pressure fuel pump for an internal combustion engine
    DE102004063075B4 (en) * 2004-12-28 2015-11-26 Robert Bosch Gmbh High-pressure fuel pump for an internal combustion engine with a stepped piston and a quantity control valve
    DE102006061231A1 (en) * 2006-12-22 2008-06-26 Robert Bosch Gmbh High pressure piston pump
    DE102013224797A1 (en) 2013-12-04 2015-06-11 Robert Bosch Gmbh Fuel pump with a piston, at its end facing a drive end a spring divider is arranged
    JP6361337B2 (en) * 2014-07-10 2018-07-25 株式会社デンソー High pressure pump

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    EP1275848A1 (en) * 2001-07-13 2003-01-15 Robert Bosch Gmbh Fuel pump for a fuel system of an internal combustion engine
    EP1312801A2 (en) * 2001-11-16 2003-05-21 Robert Bosch Gmbh Fuel cooled pumping stage for high pressure fuel pump
    EP1312801A3 (en) * 2001-11-16 2004-05-12 Robert Bosch Gmbh Fuel cooled pumping stage for high pressure fuel pump
    WO2009049776A1 (en) * 2007-10-15 2009-04-23 Ixetic Bad Homburg Gmbh Radial piston pump
    CN103717872A (en) * 2011-08-08 2014-04-09 德尔福技术控股有限公司 Fuel pump
    CN103717872B (en) * 2011-08-08 2016-06-01 德尔福国际运营卢森堡有限公司 Petrolift

    Also Published As

    Publication number Publication date
    DE50011493D1 (en) 2005-12-08
    DE19938504A1 (en) 2001-03-08
    EP1076174B1 (en) 2005-11-02
    JP2001073907A (en) 2001-03-21
    EP1076174A3 (en) 2003-11-19

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