EP1022460A2 - Mounting method - Google Patents

Mounting method Download PDF

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Publication number
EP1022460A2
EP1022460A2 EP00100847A EP00100847A EP1022460A2 EP 1022460 A2 EP1022460 A2 EP 1022460A2 EP 00100847 A EP00100847 A EP 00100847A EP 00100847 A EP00100847 A EP 00100847A EP 1022460 A2 EP1022460 A2 EP 1022460A2
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EP
European Patent Office
Prior art keywords
pump
suction
pressure
valve
units
Prior art date
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Granted
Application number
EP00100847A
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German (de)
French (fr)
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EP1022460A3 (en
EP1022460B1 (en
Inventor
Bernhard Arnold
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Siemens AG
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Siemens AG
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Publication of EP1022460A3 publication Critical patent/EP1022460A3/en
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Classifications

    • 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
    • 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
    • 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
    • F04B23/00—Pumping installations or systems
    • F04B23/04—Combinations of two or more pumps
    • F04B23/06—Combinations of two or more pumps the pumps being all of reciprocating positive-displacement type
    • 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
    • F04B49/00—Control, e.g. of pump delivery, or pump pressure of, or safety measures for, machines, pumps, or pumping installations, not otherwise provided for, or of interest apart from, groups F04B1/00 - F04B47/00
    • F04B49/22—Control, e.g. of pump delivery, or pump pressure of, or safety measures for, machines, pumps, or pumping installations, not otherwise provided for, or of interest apart from, groups F04B1/00 - F04B47/00 by means of valves
    • F04B49/225—Control, e.g. of pump delivery, or pump pressure of, or safety measures for, machines, pumps, or pumping installations, not otherwise provided for, or of interest apart from, groups F04B1/00 - F04B47/00 by means of valves with throttling valves or valves varying the pump inlet opening or the outlet opening
    • 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
    • F04B51/00—Testing machines, pumps, or pumping installations

Definitions

  • the invention relates to a method for assembling a hydrostatic pump with several in one pump housing recorded pump units according to the preamble of claim 1 and a radial piston pump assembled according to the method.
  • the hydrostatic pumps assembled according to the procedure can be used as a radial piston pump to generate high pressures, for example, in the pressure range from 50 to 1000 bar become. Areas of application can be found in the Vehicle, industrial, flight and water hydraulics and in particular in mobile hydraulics and - increasingly recently - in common rail fuel injection systems.
  • the Radial piston pumps are designed as variable pumps, whereby the volume setting etc. by stroke adjustment or can be done by suction throttling. Especially in applications where the device engineering effort is minimal should be and furthermore an optimal efficiency if partial funding is sought, the suction throttled Variable pumps of the constructions with stroke adjustment preferred.
  • the suction valves are usually spring-loaded Check valves are formed in which a suction valve body via a suction valve spring against a valve seat is biased.
  • the suction valve body can against the Force of the suction valve spring by the pressure difference between the pressure downstream of the intake throttle valve and in the cylinder chamber the assigned pump unit, i.e. by the pressure difference be opened above the suction valve body.
  • FIG. 1 two diagrams are shown in which the pressure p is one Radial piston pump with three pump units over time t is shown.
  • the diagram of Figure 1a shows the Pressure conditions with a low throttling of the volume flow to the pump, the degree of filling, for example 50% may be.
  • Figure 1b shows the pressure conditions at a lower filling level of, for example, 10%. Because of the temporally successive pumping units there is no constant pressure at the outlet of the radial piston pump but a pressure pulsation, with each peak 1, 2, 3 the Compression stroke of the assigned 1st, 2nd or 3rd pump unit corresponds.
  • the pump unit 1 conveys one Filling level of 10% no longer, so that there is a strong Pressure and volume flow pulsation at the pressure connection of the pump sets.
  • the invention is based on the object a method of assembling a hydrostatic pump and a radial piston pump installed according to this procedure create where the pressure and volume flow pulsation is minimized at low filling levels.
  • the pressure areas are dimensioned so narrow that the premature Switching off one or more pump units is practical is excluded.
  • the print areas can, for example as equal pressure intervals with 1/10 bar steps or larger with increasing suction opening pressure are going to be determined. That is, the print areas can for example with a 0.7 bar suction valve spring in groups from 0.6 to 0.7 bar; 0.7 to 0.8 bar; 0.8 to 0.9 bar ... or with increasing intervals - such as 0.7 to 0.77 bar; 0.78 to 0.86 bar; 0.87 to 0.96 bar ... to get voted.
  • the invention can be particularly advantageous in a Use a radial piston pump with three or more pump units, which, for example, as a high-pressure pump in a common rail fuel injection system is used and with the pressures up to 1500 bar can be generated.
  • FIGS 2 and 3 show views of a radial piston pump 1 with three pumping units 2a, 2b, 2c, which are operated by one common drive shaft 4 are driven.
  • the Pump units 2a, 2b, 2c and the drive shaft 4 are in a pump housing 6 mounted on the also a suction port 8 and a pressure connection 10 (Figure 2) are formed.
  • FIG. 2 shows a partial sectional view along the Line A-A in Figure 3.
  • the drive shaft 4 has an eccentric 12, on which an eccentric ring 16 is guided via a slide ring 14 is.
  • Each of the pump units by way of example based on FIG. 2 only the pump unit 2a is described has one Piston 18 of a slide shoe 20 on a flat of the eccentric ring 16 is supported.
  • Each pump unit 2 has a displacement housing 22 in which the piston 18 is guided axially and with a in the radial direction expanded cylinder head 24 on a Mounting flange 26 of the pump housing 6 is attached.
  • a suction valve 28 is received in the cylinder head 24, through which the suction port 8 with the cylinder chamber 30 of the Displacer housing 22 is connectable.
  • the pressurized pressure medium (fuel) is led through an angular bore 32 to a pressure valve 34, that in the parting plane between the cylinder head 24 and the Mounting flange 26 is formed. Downstream of the Pressure valve 34 is a pressure channel 36 in the pump housing 6 formed in a connected to the pressure port 10 Collection channel 38 opens.
  • the suction port is over a suction line 40 connected to a suction throttle valve 42, through which the from a tank T by means of a prefeed pump 44 fuel flow rate is throttled to adjust the filling level of the radial piston pump 1.
  • the Suction throttle valve 42 can, for example, be proportional adjustable two-way valve that runs over the motor control is activated.
  • the fuel delivered by the pump units 2a, 2b, 2c is conveyed to the common rail via the pressure connection 10, is arranged in the fuel injection nozzles 48.
  • the other components of the common rail injection system are in the highly simplified representation according to Figure 2 not taken into account as this for understanding the invention are of minor importance.
  • Control of the radial piston pump 1 (high pressure pump) and of the suction throttle valve 42 vary.
  • the suction valve 28 can be a preassembled unit, for example in cartridge design etc. in the displacer housing 22 are screwed in or, as in the case in FIG 2 shown embodiment directly in the displacer 22 be mounted.
  • FIG. 4 shows a detailed representation, of the suction valve 28 from FIG. 2.
  • valve seat insert 52 is screwed in, on the one hand forms a valve seat 54 and on the other hand the Receiving hole 50 seals to the outside.
  • a suction valve spring 56 supported, via which a suction valve body 58 against the Valve seat 54 is biased.
  • the suction valve insert 52 has a valve seat side Blind hole 60, the radial holes 62 in one Annulus 64 opens out via a suction channel with the suction connection 8 is connected.
  • the suction valve spring 56 is for example designed as a 0.7 bar spring, i.e. the pressure on the valve seat end face of the suction valve body 58 must be 0.7 bar higher than the pressure at the back of the Suction valve body 58 against the suction valve body 58 to lift the force of the suction valve spring 56 from the valve seat 54.
  • this only applies if the manufacturing tolerances of the components according to the specifications and the suction valve spring are a first approximation has spring characteristic independent of the path. In the In practice, however, these requirements are only disproportionate big effort realizable, so that the opening pressure for the suction valve 28 from the predetermined opening pressure (0.7 bar) deviates and changes when operating the radial piston pump adjust the irregularities shown in Figure 1b.
  • the pre-assembled pump units are now 2a, 2b, 2c, with the suction valve 28 and possibly the piston 18 subjected to a preliminary test in which the individual Suction valve opening pressure determined for each pump unit 2a becomes.
  • these groups can include, for example, pressure intervals of 0.1 bar based on a minimum pressure of 0.6 bar or pressure intervals dependent on the pressure level.
  • group 1 2nd 3rd 4th 5 constant pressure intervals (bar) 0.6 - 0.71 - 0.81 - 0.91 - 1.1 - 0.7 0.8 0.9 1.0 1.2
  • Variable pressure interval (bar) 0.6 - 0.67 - 0.75 - 0.84 - 0.93 - 0.66 0.74 0.83 0.93 1.03
  • the selection process according to the invention can be also with other suction-restricted pump types deploy.
  • a method for assembling a suction-throttled device is disclosed hydrostatic pump with multiple pump units, at which the suction valve opening pressure of each pump unit checked before installation in the pump housing and only Pump units or suction valve units are installed, whose suction valve opening pressures are within a predetermined Pressure interval.

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

Abstract

The pump assembly process comprises pre-assembling several pump units (2a, 2b, 2c) along with displacement casings, induction valve, piston and compression valve; checking the pump units before fitting them in the pump casing for the required opening pressure of the induction valve; selecting the pump units in which the induction valve opening pressure is within a preset pressure interval and assembling the pump units of one group in the pump casing (6).

Description

Die Erfindung betrifft ein Verfahren zur Montage einer hydrostatischen Pumpe mit mehreren in einem Pumpengehäuse aufgenommenen Pumpeinheiten gemäß dem Oberbegriff des Patentanspruchs 1 sowie eine nach dem Verfahren montierte Radialkolbenpumpe.The invention relates to a method for assembling a hydrostatic pump with several in one pump housing recorded pump units according to the preamble of claim 1 and a radial piston pump assembled according to the method.

Die nach dem Verfahren montierten hydrostatischen Pumpen können als Radialkolbenpumpe zur Erzeugung hoher Drücke, beispielsweise im Druckbereich von 50 bis 1000 bar ausgebildet werden. Anwendungsbereiche finden sich in der Fahrzeug-, Industrie-, Flug- und Wasserhydraulik sowie insbesondere bei der Mobilhydraulik und - in jüngster Zeit zunehmend - bei Common Rail-Kraftstoffeinspritzsystemen. Die Radialkolbenpumpen werden als Verstellpumpe ausgeführt, wobei die Volumeneinstellung u.a. durch Hubverstellung oder durch Saugdrosselung erfolgen kann. Insbesondere bei Anwendungen, bei denen der vorrichtungstechnische Aufwand minimal sein soll und desweiteren ein optimaler Wirkungsgrad bei Teilförderung angestrebt wird, werden die sauggedrosselten Verstellpumpen den Konstruktionen mit Hubverstellung vorgezogen.The hydrostatic pumps assembled according to the procedure can be used as a radial piston pump to generate high pressures, for example, in the pressure range from 50 to 1000 bar become. Areas of application can be found in the Vehicle, industrial, flight and water hydraulics and in particular in mobile hydraulics and - increasingly recently - in common rail fuel injection systems. The Radial piston pumps are designed as variable pumps, whereby the volume setting etc. by stroke adjustment or can be done by suction throttling. Especially in applications where the device engineering effort is minimal should be and furthermore an optimal efficiency if partial funding is sought, the suction throttled Variable pumps of the constructions with stroke adjustment preferred.

Bei Common-Rail-Kraftstoffeinspritzsystemen werden sauggedrosselte Radialkolbenpumpen eingesetzt, bei denen beispielsweise drei oder fünf Pumpeinheiten von einer Exzenterwelle angetrieben werden. Jede Pumpeinheit hat ein Verdrängergehäuse, in dem ein durch den Exzenter bewegbarer Radialkolben geführt ist, so daß das Druckmittel über ein Saugventil in den Zylinderraum der Pumpeinheit ansaugbar und das druckbeaufschlagte Druckmittel über ein Druckventil an eine Sammelleitung abgebbar ist. Bei sauggedrosselten Radialkolbenpumpen, wie sie beispielsweise in der WO 95/134 74 A1 beschrieben sind, ist der Saugseite der Axialkolbenpumpe ein verstellbares Saugdrosselventil vorgeschaltet, über das der Druckmittelstrom zur Hochdruckpumpe angedrosselt werden kann, um den Füllgrad der Zylinderräume der Hochdruckpumpe zu verstellen. Durch die Androsselung wird der Hohlraum- oder Gasanteil im Druckmittel (Kraftstoff) erhöht, so daß die Zylinderräume entsprechend mit weniger Druckmittel gefüllt werden.Common rail fuel injection systems suction-throttled radial piston pumps used in which for example three or five pump units from an eccentric shaft are driven. Each pumping unit has one Displacer housing in which a movable by the eccentric Radial piston is guided so that the pressure medium over a Suction valve can be sucked into the cylinder space of the pump unit and the pressurized pressure medium via a pressure valve is deliverable to a manifold. With throttled Radial piston pumps, as described, for example, in WO 95/134 74 A1 are described is the suction side of the axial piston pump an adjustable suction throttle valve upstream, via which the pressure medium flow to the high pressure pump is throttled can be used to determine the degree of filling of the cylinder High pressure pump to adjust. By throttling the void or gas content in the pressure medium (fuel) increased so that the cylinder spaces correspondingly with less Pressure medium to be filled.

Die Saugventile werden in der Regel als federvorgespannte Rückschlagventile ausgebildet, bei denen ein Saugventilkörper über eine Saugventilfeder gegen einen Ventilsitz vorgespannt ist. Der Saugventilkörper kann gegen die Kraft der Saugventilfeder durch die Druckdifferenz zwischen den Druck stromabwärts des Saugdrosselventils und im Zylinderraum der zugeordneten Pumpeinheit, d.h. durch die Druckdifferenz über dem Saugventilkörper aufgesteuert werden.The suction valves are usually spring-loaded Check valves are formed in which a suction valve body via a suction valve spring against a valve seat is biased. The suction valve body can against the Force of the suction valve spring by the pressure difference between the pressure downstream of the intake throttle valve and in the cylinder chamber the assigned pump unit, i.e. by the pressure difference be opened above the suction valve body.

Bei den vorbeschriebenen Radialkolbenpumpen werden mehrere Pumpeinheiten verwendet, um die Volumenstrom- und Druckpulsation am Pumpenausgang zu minimieren. Beim Einsatz der vorbeschriebenen sauggedrosselten Radialkolbenpumpen zeigt es sich, daß bei stärkerer Androsselung des Volumenstroms, d.h. bei niedrigerem Füllgrad der Radialkolbenpumpe einzelne Pumpeinheiten keinen oder einen geringeren Beitrag zur Druckmittelförderung leisten, als dies rein rechnerisch der Fall sein müßte.In the radial piston pumps described above, there are several Pump units used to control the volume flow and To minimize pressure pulsation at the pump outlet. When using of the suction-throttled radial piston pumps described above it turns out that if the volume flow is reduced, i.e. with a lower filling level of the radial piston pump individual pump units have no or a lower contribution to promote pressure medium than purely arithmetically should be the case.

In Figur 1, auf die bereits hier Bezug genommen sei, sind zwei Diagramme dargestellt, bei denen der Druck p einer Radialkolbenpumpe mit drei Pumpeinheiten über der Zeit t dargestellt ist. Das Diagramm gemäß Figur 1a zeigt die Druckverhältnisse bei einer geringen Androsselung des Volumenstroms zur Pumpe, wobei der Füllgrad beispielsweise 50 % betragen mag. Figur 1b zeigt die Druckverhältnisse bei einem geringeren Füllgrad von beispielsweise 10 %. Aufgrund der zeitlichen nacheinanderfördernden Pumpeinheiten ergibt sich am Ausgang der Radialkolbenpumpe kein konstanter Druck sondern eine Druckpulsation, wobei jeder Peak 1, 2, 3 dem Verdichtungshub der zugeordneten 1., 2., oder 3. Pumpeneinheit entspricht.In FIG. 1, to which reference is already made here, two diagrams are shown in which the pressure p is one Radial piston pump with three pump units over time t is shown. The diagram of Figure 1a shows the Pressure conditions with a low throttling of the volume flow to the pump, the degree of filling, for example 50% may be. Figure 1b shows the pressure conditions at a lower filling level of, for example, 10%. Because of the temporally successive pumping units there is no constant pressure at the outlet of the radial piston pump but a pressure pulsation, with each peak 1, 2, 3 the Compression stroke of the assigned 1st, 2nd or 3rd pump unit corresponds.

Wie aus der oben liegenden Darstellung 1a entnehmbar ist, ist diese Volumenstrompulsation bei hohen Füllgraden (geringe Androsselung) etwa gleichmäßig ausgebildet, wobei die Peaks der einzelnen Pumpeinheiten im wesentlichen identisch ausgebildet sind.As can be seen from the illustration 1a above is this volume flow pulsation at high filling levels (low throttling) formed approximately evenly, whereby the peaks of the individual pump units are essentially identical are trained.

Bei Verringerung des Füllgrades (stärkere Androsselung) ist zu beobachten, daß eine oder mehrere Pumpeinheiten nicht mehr zur Förderung beitragen. In dem Ausführungsbeispiel gemäß Figur 1b fördert die Pumpeinheit 1 bei einem Füllgrad von 10 % nicht mehr, so daß sich eine starke Druck- und Volumenstrompulsation am Druckanschluß der Pumpe einstellt.If the degree of filling is reduced (greater throttling) it can be observed that one or more pumping units no longer contribute to the funding. In the embodiment According to FIG. 1b, the pump unit 1 conveys one Filling level of 10% no longer, so that there is a strong Pressure and volume flow pulsation at the pressure connection of the pump sets.

Demgegenüber liegt der Erfindung die Aufgabe zugrunde, ein Verfahren zur Montage einer hydrostatischen Pumpe und eine nach diesem Verfahren montierte Radialkolbenpumpe zu schaffen, bei denen die Druck- und Volumenstrompulsation bei niedrigen Füllgraden minimiert ist.In contrast, the invention is based on the object a method of assembling a hydrostatic pump and a radial piston pump installed according to this procedure create where the pressure and volume flow pulsation is minimized at low filling levels.

Diese Aufgabe wird hinsichtlich des Verfahrens durch die Merkmale der Patentansprüche 1 oder 2 und hinsichtlich der Radialkolbenpumpe durch die Merkmale des nebengeordneten Patentanspruchs 8 gelöst.This task is accomplished with regard to the procedure the features of claims 1 or 2 and in terms the radial piston pump by the characteristics of the subordinate Claim 8 solved.

Bei der Untersuchung des vorstehend beschriebenen Phänomens bei niedrigen Füllgraden zeigte es sich, daß für das "Abschalten" einer oder mehrerer Pumpeinheiten die Toleranzen des Saugventils ursächlich sind. Bei Hochdruckpumpen in Common-Rail-Einspritzsystemen ist der Öffnungsdruck des Saugventils etwa auf 0,7 bar eingestellt. D.h., der Saugventilkörper wird über eine 0,7 bar-Saugventilfeder gegen seinen Ventilsitz vorgespannt.Examining the phenomenon described above at low filling levels, it was found that for the "Switching off" one or more pumping units the tolerances of the suction valve are the cause. With high pressure pumps in Common rail injection systems is the opening pressure of the Suction valve set to about 0.7 bar. That is, the suction valve body is countered by a 0.7 bar suction valve spring its valve seat biased.

Die Reduzierung der Toleranzen für die Saugventilfedern alleine brachte jedoch auch keine wesentliche Verbesserung, da der Saugventilöffnungsdruck nicht unwesentlich von den Toleranzen bei der Fertigung der Pumpeinheiten, insbesondere im Bereich der Saugventillagerung abhängt. Desweiteren ist eine Toleranzverringerung stets auch mit erheblichen Kosten verbunden. Erfindungsgemäß wird daher vorgeschlagen, vor der Montage der Pumpe Montagegruppen, beispielsweise die gesamte Saugventileinheit oder die gesamte Pumpeinheit auf den erforderlichen Saugventilöffnungsdruck zu überprüfen und dann in Abhängigkeit von diesen Prüfergebnissen Gruppen von Pumpeinheiten bzw. Saugventileinheiten zusammenzustellen, die innerhalb von vorbestimmten Druckbereichen öffnen. Bei der Montage werden dann lediglich Pumpeinheiten bzw. Saugventileinheiten oder entsprechende Baugruppen aus einer Gruppe montiert, so daß das eingangs beschriebene vorzeitige Abschalten einer oder mehrerer Pumpeinheiten bei niedrigen Füllgraden beseitigt werden kann. Die Ansteuerung der Pumpe kann dann in Abhängigkeit von diesen ermittelten, gleichmäßigen Saugventilöffnungsdrucken der Pumpeinheiten modifiziert werden, so daß die Druck- und Volumenstrompulsation am Pumpenausgang auch bei unterschiedlichen Füllgraden minimal ist.Reducing the tolerances for the suction valve springs alone, however, did not bring any significant improvement, since the suction valve opening pressure is not insignificant from the Tolerances in the manufacture of the pump units, in particular depends in the area of the suction valve bearing. Furthermore is a tolerance reduction always with considerable Associated costs. According to the invention, it is therefore proposed before assembling the pump assembly groups, for example the entire suction valve unit or the entire pump unit check for the required suction valve opening pressure and then depending on these test results Put together groups of pump units or suction valve units, those within predetermined pressure ranges to open. When installing, only pump units are then or suction valve units or corresponding assemblies assembled from a group, so that the initially described early shutdown of one or more Pump units can be eliminated at low filling levels can. The control of the pump can then be dependent of these determined, uniform suction valve opening pressures the pump units are modified so that the Pressure and volume flow pulsation at the pump outlet also at different filling levels is minimal.

Bei erfindungsgemäßen Verfahren wird es bevorzugt, die Pumpeinheiten jeweils als Baugruppe vorzuprüfen, da die Verdrängergehäuse Toleranzen und Kanaldurchmesser im Saugbereich der Pumpeinheiten den Öffnungsdruck neben den eigentlichen Bauteiltoleranzen des Saugventils nicht unwesentlich beeinflussen.In the method according to the invention, it is preferred that Check pump units each as an assembly, since the Displacer housing tolerances and channel diameter in the suction area of the pump units the opening pressure next to the actual one Component tolerances of the suction valve are not insignificant influence.

Die Druckbereiche werden so eng bemessen, daß das vorzeitige Abschalten einer oder mehrerer Pumpeinheiten praktisch ausgeschlossen ist. Die Druckbereiche können beispielsweise als gleiche Druckintervalle mit 1/10 bar-Schritten oder mit zunehmenden Saugöffnungsdruck größer werdend bestimmt werden. D.h., die Druckbereiche können beispielsweise bei einer 0,7 bar Saugventilfeder in Gruppen von 0,6 bis 0,7 bar; 0,7 bis 0,8 bar; 0,8 bis 0,9 bar... oder mit größerwerdenden Intervallen - wie beispielsweise 0,7 bis 0,77 bar; 0,78 bis 0,86 bar; 0,87 bis 0,96 bar... gewählt werden.The pressure areas are dimensioned so narrow that the premature Switching off one or more pump units is practical is excluded. The print areas can, for example as equal pressure intervals with 1/10 bar steps or larger with increasing suction opening pressure are going to be determined. That is, the print areas can for example with a 0.7 bar suction valve spring in groups from 0.6 to 0.7 bar; 0.7 to 0.8 bar; 0.8 to 0.9 bar ... or with increasing intervals - such as 0.7 to 0.77 bar; 0.78 to 0.86 bar; 0.87 to 0.96 bar ... to get voted.

In dem Fall, in dem die gesamte Pumpeinheit vorgeprüft wird, werden die Saugventilfeder und der Ventilsitzeinsatz des Saugventils vorteilhafter Weise am Verdrängergehäuse der Pumpeneinheit abgestützt, so daß beim erfindungsmäßen Verfahren sowohl die Toleranzen des Verdrängergehäuses als auch die Toleranzen der Saugventilbauelemente berücksichtigt sind.In the case where the entire pump unit is pre-tested the suction valve spring and the valve seat insert of the suction valve advantageously on the displacer housing the pump unit is supported so that when Invention Process both the tolerances of the displacer housing as well the tolerances of the suction valve components are also taken into account are.

Die Erfindung läßt sich besonders vorteilhaft bei einer Radialkolbenpumpe mit drei oder mehr Pumpeinheiten einsetzen, die beispielsweise als Hochdruckpumpe in einem Common-Rail-Kraftstoffeinspritzsystem verwendet wird und mit der sich Drücke bis zu 1500 bar erzeugen lassen.The invention can be particularly advantageous in a Use a radial piston pump with three or more pump units, which, for example, as a high-pressure pump in a common rail fuel injection system is used and with the pressures up to 1500 bar can be generated.

Sonstige vorteilhafte Weiterbildungen der Erfindung sind Gegenstand der weiteren Unteransprüche.Other advantageous developments of the invention are the subject of further subclaims.

Im folgenden wird ein bevorzugtes Ausführungsbeispiel der Erfindung anhand schematischer Zeichnungen näher erläutert. Es zeigen:

  • Figur 1 die Druckpulsation in Abhängigkeit von der Zeit bei einer herkömmlichen Radialkolbenpumpe;
  • Figur 2 einen vereinfachten Schaltplan eines Common-Rail-Einspritzsystems mit einer Schnittdarstellung einer erfindungsgemäßen Radialkolbenpumpe;
  • Figur 3 eine Seitenansicht auf die Radialkolbenpumpe aus Figur 2 und
  • Figur 4 eine Detaildarstellung der Radialkolbenpumpe aus Figur 2.
    • A preferred embodiment of the invention is explained in more detail below with the aid of schematic drawings. Show it:
  • Figure 1 shows the pressure pulsation as a function of time in a conventional radial piston pump;
  • FIG. 2 shows a simplified circuit diagram of a common rail injection system with a sectional illustration of a radial piston pump according to the invention;
  • Figure 3 is a side view of the radial piston pump of Figure 2 and
  • FIG. 4 shows a detailed illustration of the radial piston pump from FIG. 2.

    • Die Figuren 2 und 3 zeigen Ansichten einer Radialkolbenpumpe 1 mit drei Pumpeinheiten 2a, 2b, 2c, die von einer gemeinsamen Antriebswelle 4 angetrieben werden. Die Pumpeinheiten 2a, 2b, 2c und die Antriebswelle 4 sind in einem Pumpengehäuse 6 gelagert an dem auch ein Sauganschluß 8 und ein Druckanschluß 10 (Figur 2) ausgebildet sind.Figures 2 and 3 show views of a radial piston pump 1 with three pumping units 2a, 2b, 2c, which are operated by one common drive shaft 4 are driven. The Pump units 2a, 2b, 2c and the drive shaft 4 are in a pump housing 6 mounted on the also a suction port 8 and a pressure connection 10 (Figure 2) are formed.

    Figur 2 zeigt eine Teilschnittdarstellung entlang der Linie A-A in Figur 3. Die Antriebswelle 4 hat einen Ezenter 12, auf dem über einen Gleitring 14 ein Ezenterring 16 geführt ist.Figure 2 shows a partial sectional view along the Line A-A in Figure 3. The drive shaft 4 has an eccentric 12, on which an eccentric ring 16 is guided via a slide ring 14 is.

    Jede der Pumpeinheiten von denen anhand der Figur 2 exemplarisch nur die Pumpeinheit 2a beschrieben wird, hat einen Kolben 18 der über einen Gleitschuh 20 auf einer Abflachung des Exenterrings 16 abgestützt ist.Each of the pump units, by way of example based on FIG. 2 only the pump unit 2a is described has one Piston 18 of a slide shoe 20 on a flat of the eccentric ring 16 is supported.

    Jede Pumpeinheit 2 hat ein Verdrängergehäuse 22, in dem der Kolben 18 axialverschiebbar geführt ist und das mit einem in Radialrichtung erweiterten Zylinderkopf 24 auf einem Befestigungsflansch 26 des Pumpengehäuses 6 befestigt ist.Each pump unit 2 has a displacement housing 22 in which the piston 18 is guided axially and with a in the radial direction expanded cylinder head 24 on a Mounting flange 26 of the pump housing 6 is attached.

    Im Zylinderkopf 24 ist ein Saugventil 28 aufgenommen, über das der Sauganschluß 8 mit dem Zylinderraum 30 des Verdrängergehäuses 22 verbindbar ist.A suction valve 28 is received in the cylinder head 24, through which the suction port 8 with the cylinder chamber 30 of the Displacer housing 22 is connectable.

    Das druckbeaufschlagte Druckmittel (Kraftstoff) wird über eine Winkelbohrung 32 zu einem Druckventil 34 geführt, das in der Trennebene zwischen dem Zylinderkopf 24 und dem Befestigungsflansch 26 ausgebildet ist. Stromabwärts des Druckventils 34 ist im Pumpengehäuse 6 ein Druckkanal 36 ausgebildet, der in einen mit dem Druckanschluß 10 verbundenen Sammelkanal 38 einmündet.The pressurized pressure medium (fuel) is led through an angular bore 32 to a pressure valve 34, that in the parting plane between the cylinder head 24 and the Mounting flange 26 is formed. Downstream of the Pressure valve 34 is a pressure channel 36 in the pump housing 6 formed in a connected to the pressure port 10 Collection channel 38 opens.

    Wie in Figur 2 angedeutet, ist der Sauganschluß über eine Saugleitung 40 mit einem Saugdrosselventil 42 verbunden, über das der aus einem Tank T mittels einer Vorförderpumpe 44 geförderte Kraftstoffvolumenstrom androsselbar ist um den Füllgrad der Radialkolbenpumpe 1 zu verstellen. Das Saugdrosselventil 42 kann beispielsweise als proportional verstellbares Zwei-Wege-Ventil ausgeführt sein, das über die Motorsteuerung angesteuert ist.As indicated in Figure 2, the suction port is over a suction line 40 connected to a suction throttle valve 42, through which the from a tank T by means of a prefeed pump 44 fuel flow rate is throttled to adjust the filling level of the radial piston pump 1. The Suction throttle valve 42 can, for example, be proportional adjustable two-way valve that runs over the motor control is activated.

    Der von den Pumpeinheiten 2a, 2b, 2c geförderte Kraftstoff wird über den Druckanschluß 10 zu der Common-Rail gefördert, in der Kraftstoffeinspritzdüsen 48 angeordnet ist. Die sonstigen Bauelemente des Common-Rail-Einspritzsystems sind bei der stark vereinfachten Darstellung gemäß Figur 2 nicht berücksichtigt, da diese für das Verständnis der Erfindung von untergeordneter Bedeutung sind.The fuel delivered by the pump units 2a, 2b, 2c is conveyed to the common rail via the pressure connection 10, is arranged in the fuel injection nozzles 48. The other components of the common rail injection system are in the highly simplified representation according to Figure 2 not taken into account as this for understanding the invention are of minor importance.

    D.h., der Druck in der Common-Rail 46 läßt sich durch Ansteuerung der Radialkolbenpumpe 1 (Hochdruckpumpe) und des Saugdrosselventils 42 variieren.That is, the pressure in the common rail 46 can be passed Control of the radial piston pump 1 (high pressure pump) and of the suction throttle valve 42 vary.

    Das Saugventil 28 kann als vormontierte Einheit, beispielsweise in Patronenbauweise etc. in das Verdrängergehäuse 22 eingeschraubt werden oder aber, wie bei dem in Figur 2 dargestellten Ausführungsbeispiel direkt im Verdrängergehäuse 22 montiert sein. Figur 4 zeigt eine Detaildarstellung, des Saugventils 28 aus Figur 2.The suction valve 28 can be a preassembled unit, for example in cartridge design etc. in the displacer housing 22 are screwed in or, as in the case in FIG 2 shown embodiment directly in the displacer 22 be mounted. FIG. 4 shows a detailed representation, of the suction valve 28 from FIG. 2.

    Wie aus der Darstellung gemäß den Figuren 2 und 4 entnehmbar ist, ist in eine Aufnahmebohrung 50 des Zylinderkopfs 24 ein Ventilsitzeinsatz 52 eingeschraubt, der einerseits einen Ventilsitz 54 ausbildet und andererseits die Aufnahmebohrung 50 nach außen hin abdichtet. An einer Schulter 55 des Zylinderkopfs 24 ist eine Saugventilfeder 56 abgestützt, über die ein Saugventilkörper 58 gegen den Ventilsitz 54 vorgespannt ist.As can be seen from the illustration according to FIGS. 2 and 4 is in a receiving bore 50 of the cylinder head 24 a valve seat insert 52 is screwed in, on the one hand forms a valve seat 54 and on the other hand the Receiving hole 50 seals to the outside. At a Shoulder 55 of the cylinder head 24 is a suction valve spring 56 supported, via which a suction valve body 58 against the Valve seat 54 is biased.

    Der Saugventileinsatz 52 hat eine ventilsitzseitige Sacklochbohrung 60, die über Radialbohrungen 62 in einem Ringraum 64 mündet, der über einen Saugkanal mit dem Sauganschluß 8 verbunden ist. Die Saugventilfeder 56 ist beispielsweise als 0,7 bar-Feder ausgeführt, d.h., der Druck an der ventilsitzseitigen Stirnfläche des Saugventilkörpers 58 muß um 0,7 bar größer als der Druck an der Rückseite des Saugventilkörpers 58 sein um den Saugventilkörper 58 gegen die Kraft der Saugventilfeder 56 von dem Ventilsitz 54 abzuheben. Dies gilt allerdings nur dann, wenn die Fertigungstoleranzen der Bauteile entsprechend den Vorgaben ausgeführt sind und die Saugventilfeder eine in erster Näherung vom Weg unabhängige Federkennlinie aufweist. In der Praxis sind diese Vorgaben jedoch nur mit unverhältnismäßig großem Aufwand realisierbar, so daß der Öffnungsdruck für das Saugventil 28 von dem vorgegebenen Öffnungsdruck (0,7 bar) abweicht und sich beim Betrieb der Radialkolbenpumpe die in Figur 1b dargestellten Unregelmäßigkeiten einstellen.The suction valve insert 52 has a valve seat side Blind hole 60, the radial holes 62 in one Annulus 64 opens out via a suction channel with the suction connection 8 is connected. The suction valve spring 56 is for example designed as a 0.7 bar spring, i.e. the pressure on the valve seat end face of the suction valve body 58 must be 0.7 bar higher than the pressure at the back of the Suction valve body 58 against the suction valve body 58 to lift the force of the suction valve spring 56 from the valve seat 54. However, this only applies if the manufacturing tolerances of the components according to the specifications and the suction valve spring are a first approximation has spring characteristic independent of the path. In the In practice, however, these requirements are only disproportionate big effort realizable, so that the opening pressure for the suction valve 28 from the predetermined opening pressure (0.7 bar) deviates and changes when operating the radial piston pump adjust the irregularities shown in Figure 1b.

    Erfindungsgemäß werden nun die vormontierten Pumpeinheiten 2a, 2b, 2c, mit dem Saugventil 28 und ggf. dem Kolben 18 einer Vorprüfung unterzogen, in der der individuelle Saugventilöffnungsdruck für jede Pumpeinheit 2a bestimmt wird.According to the invention, the pre-assembled pump units are now 2a, 2b, 2c, with the suction valve 28 and possibly the piston 18 subjected to a preliminary test in which the individual Suction valve opening pressure determined for each pump unit 2a becomes.

    Nach der Saugventilöffnungsdruckbestimmung der einzelnen, vormontierten Pumpeinheiten 2 werden diese in Abhängigkeit vom Saugventilöffnungsdruck in Gruppen zusammengefaßt. Diese Gruppen können beispielsweise gemäß der Tabelle ausgehend von einem Minimaldruck 0,6 bar Druckintervalle von 0.1 bar einschließen oder aber vom Druckniveau abhängige Druckintervalle. Gruppe 1 2 3 4 5 konstante Druckintervalle (bar) 0,6 - 0,71 - 0,81 - 0,91 - 1,1 - 0,7 0,8 0,9 1,0 1,2 Variabler Druckintervall (bar) 0,6 - 0,67 - 0,75 - 0,84 - 0,93 - 0,66 0,74 0,83 0,93 1,03 After the suction valve opening pressure determination of the individual, preassembled pump units 2, these are combined into groups depending on the suction valve opening pressure. According to the table, these groups can include, for example, pressure intervals of 0.1 bar based on a minimum pressure of 0.6 bar or pressure intervals dependent on the pressure level. group 1 2nd 3rd 4th 5 constant pressure intervals (bar) 0.6 - 0.71 - 0.81 - 0.91 - 1.1 - 0.7 0.8 0.9 1.0 1.2 Variable pressure interval (bar) 0.6 - 0.67 - 0.75 - 0.84 - 0.93 - 0.66 0.74 0.83 0.93 1.03

    Erfindungsgemäß werden dann bei einer Radialkolbenpumpe lediglich Pumpeinheiten einer Gruppe bearbeitet.Then according to the invention in a radial piston pump only pump units in a group processed.

    Selbstverständlich können die in der Tabelle beispielhaft dargestellten Druckintervalle auch auf andere Weise gewählt werden, wesentlich ist, daß sichergestellt ist, daß die in einer Förderpumpe 1 verbauten Pumpeinheiten auf dem gleichen Niveau liegende Saugventilöffnungsdrücke aufweisen, so daß stets ein pulsationsfreier Kraftstoffvolumenstrom gewährleistet ist.Of course, the examples in the table shown print intervals in other ways be chosen, it is essential that it is ensured that the pump units installed in a feed pump 1 on the have suction valve opening pressures at the same level, so that there is always a pulsation-free fuel volume flow is guaranteed.

    Prinzipiell läßt sich das erfindungsgemäße Auswahlverfahren auch bei anderen sauggedrosselten Pumpenbauarten einsetzen.In principle, the selection process according to the invention can be also with other suction-restricted pump types deploy.

    Offenbart ist ein Verfahren zur Montage einer sauggedrosselten hydrostatischen Pumpe mit mehreren Pumpeinheiten, bei der der Saugventilöffnungsdruck jeder Pumpeinheit vor der Montage ins Pumpengehäuse geprüft und lediglich Pumpeinheiten oder Saugventileinheiten eingebaut werden, deren Saugventilöffnungsdrücke innerhalb eines vorbestimmten Druckintervalls liegen.A method for assembling a suction-throttled device is disclosed hydrostatic pump with multiple pump units, at which the suction valve opening pressure of each pump unit checked before installation in the pump housing and only Pump units or suction valve units are installed, whose suction valve opening pressures are within a predetermined Pressure interval.

    Claims (9)

    Verfahren zur Montage einer sauggedrosselten hydrostatischen Pumpe (1) mit mehreren in einem Pumpengehäuse (6) aufgenommenen Pumpeinheiten (2a, 2b, 2c), deren Kolben (18) von einer Antriebswelle (4) angetrieben sind und die jeweils ein Saug- und ein Druckventil (28, 34) haben, über das Druckmittel aus einer Saugleitung (40) ansaugbar bzw. an einen Sammelkanal (38) abgebbar ist, gekennzeichnet durch die Schritte: Vormontage mehrerer Pumpeinheiten (2a, 2b, 2c) mit Verdrängergehäuse (22), Saugventil (28) und ggf. Kolben (18) und Druckventil (34); Prüfen mehrerer Pumpeinheiten (2a, 2b, 2c) vor der Montage ins Pumpengehäuse im Hinblick auf den jeweils erforderlichen Öffnungsdruck des Saugventils (28); Auswahl von Pumpeinheiten (2a, 2b, 2c,) deren Saugventilöffnungsdrück in einem vorbestimmten Druckintervall liegen und Montage der Pumpeinheiten (2a, 2b, 2c) einer Gruppe im Pumpengehäuse (6). Method for assembling a suction-throttled hydrostatic pump (1) with several pump units (2a, 2b, 2c) accommodated in a pump housing (6), the pistons (18) of which are driven by a drive shaft (4) and each have a suction and a pressure valve (28, 34), via which pressure medium can be sucked in from a suction line (40) or delivered to a collecting duct (38), characterized by the steps: Pre-assembly of several pump units (2a, 2b, 2c) with displacement housing (22), suction valve (28) and possibly piston (18) and pressure valve (34); Checking a plurality of pump units (2a, 2b, 2c) before installation in the pump housing with regard to the respectively required opening pressure of the suction valve (28); Selection of pump units (2a, 2b, 2c,) whose suction valve opening pressures are within a predetermined pressure interval and Assembly of the pump units (2a, 2b, 2c) of a group in the pump housing (6). Verfahren zur Montage einer hydrostatischen Pumpe (1) mit mehreren in einem Pumpengehäuse (6) aufgenommenenen Pumpeinheiten (2a, 2b, 2c), deren Kolben (18) von einer Antriebswelle (4) angetrieben sind, und die jeweils ein Saug- und ein Druckventil (28, 34) haben, über das Druckmittel aus einer Saugleitung (40) ansaugbar bzw. an einen Sammelkanal abgebbar ist, wobei zumindest das Saugventil (28) als Einbauventil ausgebildet ist, gekennzeichnet durch die Schritte: Vormontage mehrerer Saugventile (28); Prüfen mehrerer Saugventile (28) im Hinblick auf den erforderlichen Öffnungsdruck; Auswahl von Saugventilen (28), deren Öffnungsdruck in einem vorbestimmten Druckbereich liegt und Montage der Saugventile (28) in der Pumpeinheit (2a, 2b, 2c) oder im Pumpengehäuse (6). Method for assembling a hydrostatic pump (1) with a plurality of pump units (2a, 2b, 2c) accommodated in a pump housing (6), the pistons (18) of which are driven by a drive shaft (4), and each have a suction and a pressure valve (28, 34), via which pressure medium can be sucked in from a suction line (40) or delivered to a collecting duct, at least the suction valve (28) being designed as a built-in valve, characterized by the steps: Pre-assembly of several suction valves (28); Checking a plurality of suction valves (28) with regard to the required opening pressure; Selection of suction valves (28) whose opening pressure is in a predetermined pressure range and Assembly of the suction valves (28) in the pump unit (2a, 2b, 2c) or in the pump housing (6). Verfahren nach Patentanspruch 1 oder 2, dadurch gekennzeichnet, daß die Druckbereiche aufsteigend jeweils gleiche Druckintervalle abdecken.Method according to claim 1 or 2, characterized in that that the pressure ranges ascending each cover the same print intervals. Verfahren nach Patentanspruch 1 oder 2, dadurch gekennzeichnet, daß die Druckbereiche Druckintervalle abdecken, die mit zunehmenden Druck größer werden.Method according to claim 1 or 2, characterized in that that the printing areas cover printing intervals, which get bigger with increasing pressure. Verfahren nach Patentanspruch 4, dadurch gekennzeichnet, daß die Druckintervalle proportional zu den Minimaldrücken der jeweiligen Druckintervalle ansteigen.Method according to claim 4, characterized in that the pressure intervals are proportional to the minimum pressures of the respective printing intervals increase. Verfahren nach einem der vorhergehenden Patentansprüche, dadurch gekennzeichnet, daß die Pumpe eine sauggedrosselte Radialkolbenpumpe (1) ist, in deren Pumpengehäuse (6) eine Anzahl von zumindest drei Pumpeinheiten (2a, 2b, 2c) montiert wird, so daß eine Gruppe zumindest drei Pumpeinheiten (2a, 2b, 2c) enthalten muß.Method according to one of the preceding claims, characterized in that the pump is throttled Radial piston pump (1) is in the pump housing (6) a number of at least three pumping units (2a, 2b, 2c) is mounted so that at least one group three pump units (2a, 2b, 2c) must contain. Verfahren nach Patentanspruch 6, dadurch gekennzeichnet, daß sich die Druckbereiche von einem unteren Grenzwert, insbesondere 0,6 bar, ausgehend über jeweils 0,1 bar erstrecken oder von dem unteren Grenzwert ausgehend, über jeweils 10 % der unteren oder oberen Druckintervallgrenze erstrecken. Method according to claim 6, characterized in that the print areas differ from a lower one Limit, in particular 0.6 bar, based on each Extend 0.1 bar or starting from the lower limit, over 10% each of the lower or upper Extend print interval limit. Radialkolbenpumpe mit mehreren in einem Pumpengehäuse (6) aufgenommenen Pumpeinheiten (2a, 2b, 2c) deren Kolben (18) von einer Antriebswelle (4) angetrieben sind und die jeweils ein Saug- und ein Druckventil (28, 34) haben, über das Druckmittel aus einer Saugleitung (40) ansaugbar bzw. an ein Sammelkanal (38) abgebbar ist, dadurch gekennzeichnet, daß die Saugventile (28) jeder Pumpeinheit (2a, 2b, 2c) innerhalb eines vorbestimmten Saugventilöffnungsdruckintervalls öffnen.Radial piston pump with several in one pump housing (6) recorded pump units (2a, 2b, 2c) whose pistons (18) are driven by a drive shaft (4) and each have a suction and a pressure valve (28, 34) have, via the pressure medium from a suction line (40) can be sucked in or delivered to a collecting duct (38), characterized in that the suction valves (28) each Pump unit (2a, 2b, 2c) within a predetermined Open suction valve opening pressure interval. Radialkolbenpumpe nach Patentanspruche 8, dadurch gekennzeichnet, daß in einem Verdrängergehäuse (22) jeder Pumpeinheit (2a, 2b, 2c) eine Saugventilfeder (56) mit Saugventilkörper (58) und ein Ventilsitzeinsatz (52) abgestützt werden.Radial piston pump according to patent claim 8, characterized in that that in a displacement housing (22) each Pump unit (2a, 2b, 2c) with a suction valve spring (56) Suction valve body (58) and a valve seat insert (52) be supported.
    EP00100847A 1999-01-21 2000-01-17 Mounting method Expired - Lifetime EP1022460B1 (en)

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    DE19902259B4 (en) 2006-02-23
    DE50005753D1 (en) 2004-04-29
    EP1022460A3 (en) 2000-12-27
    DE19902259A1 (en) 2000-07-27
    EP1022460B1 (en) 2004-03-24

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