EP1144866A2 - Radial piston pump - Google Patents

Radial piston pump

Info

Publication number
EP1144866A2
EP1144866A2 EP99922070A EP99922070A EP1144866A2 EP 1144866 A2 EP1144866 A2 EP 1144866A2 EP 99922070 A EP99922070 A EP 99922070A EP 99922070 A EP99922070 A EP 99922070A EP 1144866 A2 EP1144866 A2 EP 1144866A2
Authority
EP
European Patent Office
Prior art keywords
piston
drive shaft
plate
pistons
facing
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.)
Withdrawn
Application number
EP99922070A
Other languages
German (de)
French (fr)
Other versions
EP1144866A3 (en
Inventor
Hans-Juergen Simon
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Robert Bosch GmbH
Original Assignee
Robert Bosch GmbH
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Robert Bosch GmbH filed Critical Robert Bosch GmbH
Publication of EP1144866A2 publication Critical patent/EP1144866A2/en
Publication of EP1144866A3 publication Critical patent/EP1144866A3/en
Withdrawn legal-status Critical Current

Links

Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • 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
    • 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
    • F04B1/0426—Arrangements for pressing the pistons against the actuated cam; Arrangements for connecting the pistons to the actuated cam

Definitions

  • the invention relates to a radial piston pump for generating high fuel pressure
  • Fuel injection systems of internal combustion engines in particular in the case of a common rail injection system, with a drive shaft mounted in a pump housing, which is eccentrically formed or has cam-like elevations in the circumferential direction, and preferably with a plurality of pistons arranged radially with respect to the drive shaft in a respective element bore, which rotate of the drive shaft can be moved back and forth in the respective element bore in the radial direction, a plate being held in each case at the ends of the pistons facing the drive shaft.
  • Such a radial piston pump is known for example from DE 42 16 877.
  • the plate is held on the associated piston by a clamp device in the form of a plate disk with clamp arms bent inwards which surround the plate.
  • a clamp device in the form of a plate disk with clamp arms bent inwards which surround the plate.
  • the invention is therefore based on the problem of providing a radial piston pump which can be assembled easily and quickly.
  • the individual clip devices should be prevented from getting caught during storage.
  • Fuel injection systems of internal combustion engines in particular in a common rail injection system, with a drive shaft mounted in a pump housing, which is eccentrically formed or has cam-like elevations in the circumferential direction, and preferably with a plurality of pistons arranged radially with respect to the drive shaft in a respective element bore, which rotate the drive shaft can be moved back and forth in the respective element bore in the radial direction, a plate being held on each of the ends of the piston facing the drive shaft, in that one or more recesses are arranged in the surface of the plate facing the piston , engage in the assembled snap hooks, which are formed on a plate holder which is attached to the associated piston.
  • the snap hooks provide the advantage that they do not bend as much when assembled as the clamp arms known from the prior art. This reduces the stress on the material during assembly, which leads to a longer service life of the radial piston pump.
  • a blind hole is in the center in the surface of the plate facing the piston is recessed with a circumferential groove in which a snap ring engages, which is held in a recess on the piston.
  • this variant has the advantage that it requires fewer parts than the known solution. This reduces the manufacturing costs of the radial piston pump.
  • the above-mentioned object is achieved in that in the surface of the plate facing the piston, a blind hole and two parallel bores are cut out in the middle, which run transversely to the blind hole so that the center lines of the bores Tangential surface of the blind hole, the holes serve to receive two pins that engage in the inserted state in a recess that is attached to the piston.
  • Invention is characterized in that the two pins are connected by a web to a bracket.
  • This embodiment has the advantage that the pins are automatically axially fixed when the web comes into contact with the plate.
  • Another embodiment of the second variant of the invention is characterized in that the web is secured in the inserted state of the clip by a projection which is formed on the plate. This ensures in an advantageous manner that the pins do not slip out of the holes during operation.
  • Figure 1 shows a plan view of a plate holder according to a first variant of the present invention
  • FIG. 2 shows a partial view of a section through a radial piston pump in the longitudinal direction of a piston with the plate holder from FIG. 1;
  • Figure 3 shows a partial view of a section through a radial piston pump in the longitudinal direction of a piston with a plate holder according to a second
  • Figure 4 shows a partial view of a section through a radial piston pump transverse to a piston with a plate holder according to a third variant of the present invention
  • FIG. 5 shows a partial view of a section through the radial piston pump from FIG. 4 in the longitudinal direction of the piston;
  • Figure 6 shows a top view of the plate holder used in Figures 4 and 5;
  • FIG. 7 shows a front view of that in FIGS.
  • the plate halcer designated overall by 1 in FIG. 1, is formed by a base body 2, which has the shape of a ring with a rectangular cross section. Of the Base body 2 extends in the radial direction six arms 3, 4, 5, 6, 7 and 8.
  • the arms 3 - 8 are bent off from the base body 2 at an angle of 90 °.
  • the ends of the arms 3 - 8 are designed as snap hooks 10 - 15.
  • the snap hooks 10-15 engage in a recess 16 which is formed in a plate 17.
  • the plate 17 has a blind hole 18 in the middle, into which a piston 19 is received.
  • the piston 19 belongs to an internally supported radial piston pump, as is particularly the case in common rail
  • Common rail means “common line”.
  • injection nozzles in common-rail injection systems are fed from a common line.
  • the radial piston pump shown only partially in FIG. 2 comprises a drive shaft mounted in a pump housing with an eccentrically designed shaft section 20.
  • a ring 21 is arranged on the eccentric shaft section 20, against which the shaft section 20 is rotatably supported by means of a slide bearing 22.
  • the ring 21 comprises three flats offset by 120 ° to each other, against each of which a piston is supported.
  • the preferably three pistons are each received in an element bore to the drive shaft so as to be able to move back and forth in the radial direction and each delimit a cylinder space.
  • the radial piston pump shown only partially in FIG. 2 serves to apply high pressure to fuel that is supplied by a prefeed pump from a tank. The high-pressure fuel is then fed into the common line mentioned above. in the
  • the pistons 19 are moved away from the axis of the drive shaft due to the eccentric movement of the eccentric shaft section 20, which is transmitted to the pistons 19 via the ring 21.
  • the pistons 19 move radially towards the axis of the drive shaft in order to draw fuel into the cylinder chambers.
  • the suction stroke movement of the pistons 19 is achieved by springs, not shown, which are biased against the plates 17.
  • the plate holder 1 holds the plate 17 in contact with the
  • Piston 19 and vice versa At the end of the piston 19 facing the plate 17, a recess 24 is provided, in which a snap ring 25 is arranged.
  • the snap ring 25 forms a stop for the annular base body 2 of the plate holder 1. This ensures that the plate holder 1 does not slide off the end of the piston 19.
  • the recess 16 in the plate 17 has the shape of a ring with a rectangular cross section and is open at the top.
  • a circumferential shoulder 26 projects into the recess 16 and forms an abutment for the snap hooks 10-15.
  • the plate 17 has a smaller thickness on the inside in the area of the blind hole 18 than on the outside in the area of the shoulder 26. In this way, a space for receiving the snap ring 25 is created. As a result, the base body 2 of the plate holder 1 protrudes only slightly above the surface of the plate 17.
  • the basic structure of the radial piston pump shown in detail in FIG. 3 according to the second variant of the invention is the same as in the variant shown in FIGS. 1 and 2. To simplify matters, the same reference numerals are used for the same parts.
  • the eccentric shaft section 20 of the drive shaft of a radial piston pump is rotatably supported in a pump housing (not shown) with the aid of a slide bearing 22. The eccentric movement of the drive shaft is transmitted via a ring or a polygon 21 to a plate 37 attached to the piston 19.
  • a snap ring 38 is used as the plate holder.
  • the snap ring 38 is in contact with a recess 39 which is provided on the end of the piston 19 facing the plate 37.
  • a circumferential groove 40 is formed in the plate 37 adjacent to the recess 39 of the piston 19. The depth of the circumferential groove 40 is somewhat larger than the diameter of the cross section of the snap ring 38. This simplifies the mounting of the plate 37 on the piston 19.
  • the assembly can proceed as follows. First, the snap ring 38 is inserted into the circumferential groove 40 of the plate 37. Thereupon, the piston 19 is inserted into the blind hole 41, which is recessed in the plate 37, similar to a quick-release fastener. When the piston 19 is inserted into the blind hole 41, the snap ring 38 is first pressed into the circumferential groove 40 and then snaps into the recess 39.
  • a blind hole 45 for receiving a piston 19 is recessed in a plate 47.
  • a plate 47 extend in the plate 47 perpendicular to that Blind hole 45 two bores 48, 49.
  • the center lines of the bores 48, 49 are at a distance from one another which corresponds to the diameter of the piston 19.
  • the bores 48, 49 partially overlap with a recess 51 which is provided on the piston 19.
  • two pins 55, 56 are received in the bores 48, 49.
  • the pins 55, 56 protrude into the recess 51 of the piston 19 from two sides.
  • the two pins 55, 56 are connected to one another by a web 57.
  • the pins 55, 56 and the web 57 form a bracket, which is designated overall by 58.
  • bracket 58 is shown in the installed state.
  • a recess 59 for receiving the clamp 58 is formed in the plate 47.
  • a projection 60 which is molded onto the plate 47, serves as a securing device which fixes the web 57 in its position in the installed state.

Landscapes

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

Abstract

The invention relates to a radial piston pump, comprising a drive shaft which is mounted in a pump housing and configured eccentrically or in its direction of circumference has cam-like raised areas, and preferably several pistons which are positioned radially in relation to the drive shaft and are each housed in an element hole. When the drive shaft is rotated the pistons are displaced radially backwards and forwards in their element holes, a plate being held at the ends of the pistons facing the drive shaft. A first variation of the invention is characterized in that in the surface of the plate facing the pistons one or more recesses are provided for in which in the assembled state snap hooks engage which are embodied on a plate support attached to the corresponding piston. A second variation of the invention is characterized in that in the middle of the surface of the plate facing the piston a blind hole having a circumferential groove is configured in which a snap ring engages which is held in a groove in the piston. A third variation of the piston is characterized in that in the middle of the surface of the plate facing the piston a blind hole and two parallel holes are configured which run parallel to the blind hole in such a way that the center lines of the holes are tangential to the lateral area of the blind hole. The holes serve to house two pins which when inserted engage a groove embodied at the level of the piston.

Description

Radialkolbenpumpe Radial piston pump
Beschreibungdescription
Die Erfindung betrifft eine Radialkolbenpumpe zur Kraftstoffhochdruckerzeugung beiThe invention relates to a radial piston pump for generating high fuel pressure
Kraftstoffeinspritzsystemen von Brennkraftmaschinen, insbesondere beim einem Common-Rail-Einspritzsystem, mit einer in einem Pumpengehäuse gelagerten Antriebswelle, die exzentrisch ausgebildet ist oder in Umfangsrichtung nockenartige Erhebungen aufweist, und mit vorzugsweise mehreren bezüglich der Antriebswelle radial in einer jeweiligen Elementbohrung angeordneten Kolben, die durch Drehen der Antriebswelle in der jeweiligen Elementbohrung in radialer Richtung hin- und herbewegbar sind, wobei an den zur Antriebswelle gewandten Enden der Kolben jeweils eine Platte gehalten ist.Fuel injection systems of internal combustion engines, in particular in the case of a common rail injection system, with a drive shaft mounted in a pump housing, which is eccentrically formed or has cam-like elevations in the circumferential direction, and preferably with a plurality of pistons arranged radially with respect to the drive shaft in a respective element bore, which rotate of the drive shaft can be moved back and forth in the respective element bore in the radial direction, a plate being held in each case at the ends of the pistons facing the drive shaft.
Eine derartige Radialkolbenpumpe ist beispielsweise aus der DE 42 16 877 bekannt. Bei der bekannten Radialkolbenpumpe ist die Platte durch eine Klammereinrichtung in Form einer Tellerscheibe mit nach innen umgebogenen Klammerarmen, welche die Platte umgreifen, an dem zugehörigen Kolben gehalten. Bei der Aufbewahrung der Klammereinrichtungen kommt es vor, daß die nach innen umgebogenen Klammerarme von verschiedenen Klammereinrichtungen miteinander verhaken. Das Lösen der einzelnen Klammereinrichtungen voneinander kostet Zeit und verzögert den Zusammenbau der Radialkolbenpumpe .Such a radial piston pump is known for example from DE 42 16 877. In the known radial piston pump, the plate is held on the associated piston by a clamp device in the form of a plate disk with clamp arms bent inwards which surround the plate. When the clip devices are stored, it can happen that the clip arms bent inwards from different clip devices interlock. Detaching the individual clamp devices from one another takes time and delays the assembly of the Radial piston pump.
Der Erfindung liegt daher das Problem zugrunde, eine Radialkolbenpumpe bereitzustellen, die sich einfach und schnell zusammenbauen läßt. Insbesondere solle ein Verhaken der einzelnen Klammereinrichtungen bei der Aufbewahrung verhindert werden.The invention is therefore based on the problem of providing a radial piston pump which can be assembled easily and quickly. In particular, the individual clip devices should be prevented from getting caught during storage.
Das Problem ist bei einer Radialkolbenpumpe zur Kraftstoffhochdruckerzeugung beiThe problem is with a radial piston pump for high-pressure fuel generation
Kraftstoffeinspritzsystemen von Brennkraftmaschinen, insbesondere bei einem Common-Rail-Einspritzsystem, mit einer in einem Pumpengehäuse gelagerten Antriebswelle, die exzentrisch ausgebildet ist oder in Umfangsrichtung nockenartige Erhebungen aufweist, und mit vorzugsweise mehreren bezüglich der Antriebswelle radial in einer jeweiligen Elementbohrung angeordneten Kolben, die durch Drehen der Antriebswelle in der jeweiligen Elementbohrung in radialer Richtung hin- und herbewegbar sind, wobei an denen zu der Antriebswelle gewandten Enden der Kolben jeweils eine Platte gehalten ist, dadurch gelöst, daß in der zu dem Kolben gewandten Oberfläche der Platte eine oder mehrere Ausnehmungen angeordnet sind, in die im zusammengebauten Zustand Schnapphaken eingreifen, die an einem Plattenhalter ausgebildet sind, der an dem zugehörigen Kolben angebracht ist . Neben einer einfachen und schnellen Montage liefern die Schnapphaken den Vorteil, daß sie sich beim Zusammenbauen nicht so stark verbiegen wie die aus dem Stand der Technik bekannten Klammerarme . Dadurch wird die Belastung des Materials bei der Montage reduziert, was zu einer höheren Lebensdauer der Radialkolbenpumpe führt .Fuel injection systems of internal combustion engines, in particular in a common rail injection system, with a drive shaft mounted in a pump housing, which is eccentrically formed or has cam-like elevations in the circumferential direction, and preferably with a plurality of pistons arranged radially with respect to the drive shaft in a respective element bore, which rotate the drive shaft can be moved back and forth in the respective element bore in the radial direction, a plate being held on each of the ends of the piston facing the drive shaft, in that one or more recesses are arranged in the surface of the plate facing the piston , engage in the assembled snap hooks, which are formed on a plate holder which is attached to the associated piston. In addition to simple and quick assembly, the snap hooks provide the advantage that they do not bend as much when assembled as the clamp arms known from the prior art. This reduces the stress on the material during assembly, which leads to a longer service life of the radial piston pump.
Gemäß einer ersten Variante der Erfindung ist das oben angegebene Problem dadurch gelöst, daß in der zu dem Kolben gewandten Oberfläche der Platte in der Mitte ein Sackloch mit einer Umfangsnut ausgespart ist, in die ein Sprengring eingreift, der in einem Einstich an dem Kolben gehalten ist. Diese Variante liefert neben der schnelleren Montage den Vorteil, daß sie mit weniger Teilen auskommt als die bekannte Lösung. Dadurch werden die Herstellkosten der Radialkolbenpumpe reduziert.According to a first variant of the invention, the problem specified above is solved in that a blind hole is in the center in the surface of the plate facing the piston is recessed with a circumferential groove in which a snap ring engages, which is held in a recess on the piston. In addition to the faster assembly, this variant has the advantage that it requires fewer parts than the known solution. This reduces the manufacturing costs of the radial piston pump.
Bei einer zweiten Variante der Erfindung ist die oben angegebene Aufgabe dadurch gelöst, daß in der zu dem Kolben gewandten Oberfläche der Platte in der Mitte ein Sackloch und zwei parallele Bohrungen ausgespart sind, die quer zu dem Sackloch so verlaufen, daß die Mittellinien der Bohrungen die Mantelfläche des Sacklochs tangieren, wobei die Bohrungen zur Aufnahme von zwei Stiften dienen, die im eingesetzten Zustand in einen Einstich eingreifen, der an dem Kolben angebracht ist. Mit dieser zweiten Variante werden die gleichen Vorteile erzielt, wie mit der ersten Variante .In a second variant of the invention, the above-mentioned object is achieved in that in the surface of the plate facing the piston, a blind hole and two parallel bores are cut out in the middle, which run transversely to the blind hole so that the center lines of the bores Tangential surface of the blind hole, the holes serve to receive two pins that engage in the inserted state in a recess that is attached to the piston. The same advantages are achieved with this second variant as with the first variant.
Eine besondere Ausführungsart der zweiten Variante derA special embodiment of the second variant of the
Erfindung ist dadurch gekennzeichnet, daß die beiden Stifte durch einen Steg zu einer Klammer verbunden sind. Diese Ausführungsart hat den Vorteil, daß die Stifte automatisch axial fixiert werden, wenn der Steg gegen die Platte in Anschlag kommt.Invention is characterized in that the two pins are connected by a web to a bracket. This embodiment has the advantage that the pins are automatically axially fixed when the web comes into contact with the plate.
Eine weitere Ausführungsart der zweiten Variante der Erfindung ist dadurch gekennzeichnet, daß der Steg im eingesetzten Zustand der Klammer durch einen Vorsprung gesichert ist, der an der Platte ausgebildet ist. Dadurch ist in vorteilhafter Weise gewährleistet, daß die Stifte im Betrieb nicht aus den Bohrungen herausrutschen.Another embodiment of the second variant of the invention is characterized in that the web is secured in the inserted state of the clip by a projection which is formed on the plate. This ensures in an advantageous manner that the pins do not slip out of the holes during operation.
Weitere Vorteile, Merkmale und Einzelheiten der Erfindung ergeben sich aus der nachfolgenden Beschreibung, in der unter Bezugnahme auf die Zeichnungen mehrere 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.Further advantages, features and details of the invention emerge from the following description, in which several with reference to the drawings Embodiments of the invention are described in detail. The features mentioned in the claims and in the description can each be essential to the invention individually or in any combination.
Figur 1 zeigt eine Draufsicht eines Plattenhalters gemäß- einer ersten Variante der vorliegenden Erfindung;Figure 1 shows a plan view of a plate holder according to a first variant of the present invention;
Figur 2 zeigt eine Teilansicht eines Schnittes durch eine Radialkolbenpumpe in Längsrichtung eines Kolbens mit dem Plattenhalter aus Figur 1 ;FIG. 2 shows a partial view of a section through a radial piston pump in the longitudinal direction of a piston with the plate holder from FIG. 1;
Figur 3 zeigt eine Teilansicht eines Schnitts durch eine Radialkolbenpumpe in Längsrichtung eines Kolbens mit einem Plattenhalter gemäß einer zweitenFigure 3 shows a partial view of a section through a radial piston pump in the longitudinal direction of a piston with a plate holder according to a second
Variante der vorliegenden Erfindung;Variant of the present invention;
Figur 4 zeigt eine Teilansicht eines Schnitts durch eine Radialkolbenpumpe quer zu einem Kolben mit einem Plattenhalter gemäß einer dritten Variante der vorliegenden Erfindung;Figure 4 shows a partial view of a section through a radial piston pump transverse to a piston with a plate holder according to a third variant of the present invention;
Figur 5 zeigt eine Teilansicht eines Schnitts durch die Radialkolbenpumpe aus Figur 4 in Längsrichtung des Kolbens;FIG. 5 shows a partial view of a section through the radial piston pump from FIG. 4 in the longitudinal direction of the piston;
Figur 6 zeigt eine Draufsicht des in den Figuren 4 und 5 verwendeten Plattenhalters; undFigure 6 shows a top view of the plate holder used in Figures 4 and 5; and
Figur 7 zeigt eine Vorderansicht des in den Figuren 4 bisFIG. 7 shows a front view of that in FIGS
6 dargestellten Plattenhalters im eingebauten Zustand.6 shown plate holder in the installed state.
Der in Figur 1 insgesamt mit 1 bezeichnete Plattenhalcer wird von einem Grundkörper 2 gebildet, der die Form eines Rings mit einem rechteckigen Querschnitt hat . Von dem Grundkörper 2 erstrecken sich in radialer Richtung sechs Arme 3 , 4 , 5 , 6 , 7 und 8.The plate halcer, designated overall by 1 in FIG. 1, is formed by a base body 2, which has the shape of a ring with a rectangular cross section. Of the Base body 2 extends in the radial direction six arms 3, 4, 5, 6, 7 and 8.
Wie man in der in Figur 2 dargestellten Schnittansicht sieht, sind die Arme 3 - 8 in einem Winkel von 90° von dem Grundkörper 2 abgebogen. Die Enden der Arme 3 - 8 sind als Schnapphaken 10 - 15 ausgebildet.As can be seen in the sectional view shown in FIG. 2, the arms 3 - 8 are bent off from the base body 2 at an angle of 90 °. The ends of the arms 3 - 8 are designed as snap hooks 10 - 15.
Die Schnapphaken 10 - 15 greifen in eine Ausnehmung 16 ein, die in einer Platte 17 ausgebildet ist. Die Platte 17 weist in der Mitte ein Sackloch 18 auf, in das ein Kolben 19 aufgenommen ist.The snap hooks 10-15 engage in a recess 16 which is formed in a plate 17. The plate 17 has a blind hole 18 in the middle, into which a piston 19 is received.
Der Kolben 19 gehört zu einer innen abgestützten Radialkolbenpumpe, wie sie insbesondere in Common-Rail-The piston 19 belongs to an internally supported radial piston pump, as is particularly the case in common rail
Einspritzsystem zur Kraftstoffversorgung von Dieselmotoren eingesetzt wird. Dabei bedeutet "Common-Rail" soviel wie "gemeinsame Leitung" . Im Gegensatz zu herkömmlichen Hochdruckeinspritzsystemen, in denen der Kraftstoff über getrennte Leitungen zu den einzelnen Brennräumen gefördert wird, werden die Einspritzdüsen in Common-Rail - Einspritzsystemen aus einer gemeinsamen Leitung gespeist.Injection system for the fuel supply of diesel engines is used. "Common rail" means "common line". In contrast to conventional high-pressure injection systems, in which the fuel is conveyed to the individual combustion chambers via separate lines, the injection nozzles in common-rail injection systems are fed from a common line.
Die in Figur 2 nur teilweise dargestellte Radialkolbenpumpe umfaßt eine in einem Pumpengehäuse gelagerte Antriebswelle mit einem exzentrisch ausgebildeten Wellenabschnitt 20. Auf dem exzentrischen Wellenabschnitt 20 ist ein Ring 21 angeordneet, gegenüber dem der Wellenabschnitt 20 mit Hilfe eines Gleitlagers 22 drehbar gelagert ist. Der Ring 21 umfaßt drei um 120° zueinander versetzte Abflachungen, gegen die sich jeweils ein Kolben abstützt. Die vorzugsweise drei Kolben sind jeweils in einer Elementbohrung zur Antriebswelle in radialer Richtung hin- und herbewegbar aufgenommen und begrenzen jeweils einen Zylinderraum. Die in Figur 2 nur teilweise dargestellte Radialkolbenpumpe dient dazu, Kraftstoff, der von einer Vorförderpumpe aus einem Tank geliefert wird, mit Hochdruck zu beaufschlagen. Der mit Hochdruck beaufschlagte Kraftstoff wird dann in die oben angesprochene gemeinsame Leitung gefördert . ImThe radial piston pump shown only partially in FIG. 2 comprises a drive shaft mounted in a pump housing with an eccentrically designed shaft section 20. A ring 21 is arranged on the eccentric shaft section 20, against which the shaft section 20 is rotatably supported by means of a slide bearing 22. The ring 21 comprises three flats offset by 120 ° to each other, against each of which a piston is supported. The preferably three pistons are each received in an element bore to the drive shaft so as to be able to move back and forth in the radial direction and each delimit a cylinder space. The radial piston pump shown only partially in FIG. 2 serves to apply high pressure to fuel that is supplied by a prefeed pump from a tank. The high-pressure fuel is then fed into the common line mentioned above. in the
Förderhub werden die Kolben 19 infolge der Exzenterbeweguϊlg des exzentrischen Wellenabschnitts 20, die über den Ring 21 auf die Kolben 19 übertragen wird, von der Achse der Antriebswelle weg nach außen bewegt. Im Saughub bewegen sich die Kolben 19 radial auf die Achse der Antriebswelle zu, um Kraftstoff in die Zylinderräume zu saugen. Die Saughubbewegung der Kolben 19 wird durch nicht dargestellte Federn erreicht, die gegen die Platten 17 vorgespannt sind.Conveying stroke, the pistons 19 are moved away from the axis of the drive shaft due to the eccentric movement of the eccentric shaft section 20, which is transmitted to the pistons 19 via the ring 21. In the suction stroke, the pistons 19 move radially towards the axis of the drive shaft in order to draw fuel into the cylinder chambers. The suction stroke movement of the pistons 19 is achieved by springs, not shown, which are biased against the plates 17.
Der Plattenhalter 1 hält die Platte 17 in Anlage an demThe plate holder 1 holds the plate 17 in contact with the
Kolben 19 und umgekehrt. An dem zu der Platte 17 gewandten Ende des Kolbens 19 ist ein Einstich 24 vorgesehen, in dem ein Sprengring 25 angeordnet ist. Der Sprengring 25 bildet einen Anschlag für den ringförmigen Grundkörper 2 des Plattenhalters 1. Auf diese Weise wird erreicht, daß der Plattenhalter 1 nicht von dem Ende des Kolbens 19 herunterrutscht .Piston 19 and vice versa. At the end of the piston 19 facing the plate 17, a recess 24 is provided, in which a snap ring 25 is arranged. The snap ring 25 forms a stop for the annular base body 2 of the plate holder 1. This ensures that the plate holder 1 does not slide off the end of the piston 19.
Die Ausnehmung 16 in der Platte 17 hat die Form eines Rings mit einem rechteckförmigen Querschnitt und ist nach oben hin offen. Auf der zu dem Kolben 19 hin offenen Seite der_ Ausnehmung 16 ragt eine umlaufende Schulter 26 in die Ausnehmung 16 und bildet ein Widerlager für die Schnapphaken 10 - 15.The recess 16 in the plate 17 has the shape of a ring with a rectangular cross section and is open at the top. On the side of the recess 16 which is open towards the piston 19, a circumferential shoulder 26 projects into the recess 16 and forms an abutment for the snap hooks 10-15.
Die Platte 17 hat innen im Bereich des Sacklochs 18 eine geringere Dicke als außen im Bereich der Schulter 26. Auf diese Weise wird ein Platz zur Aufnahme des Sprengrings 25 geschaffen. Das hat zur Folge, daß der Grundkörper 2 des Plattenhalters 1 nur geringfügig über die Oberfläche der Platte 17 hervorsteht . Der prinzipielle Aufbau der in Figur 3 ausschnittsweise dargestellten Radialkolbenpumpe gemäß der zweiten Variante der Erfindung ist genauso wie bei der in den Figuren 1 und 2 dargestellten Variante. Zur Vereinfachung werden für gleiche Teile die gleichen Bezugszeichen verwendet. Der exzentrische Wellenabschnitt 20 der Antriebswelle einer Radialkolbenpumpe ist mit Hilfe eines Gleitlagers 22 drehbar in einem nicht dargestellten Pumpengehäuse gelagert. Die Exzenterbewegung der Antriebswelle wird über einen Ring bzw. ein Polygon 21 auf eine an dem Kolben 19 angebrachte Platte 37 übertragen.The plate 17 has a smaller thickness on the inside in the area of the blind hole 18 than on the outside in the area of the shoulder 26. In this way, a space for receiving the snap ring 25 is created. As a result, the base body 2 of the plate holder 1 protrudes only slightly above the surface of the plate 17. The basic structure of the radial piston pump shown in detail in FIG. 3 according to the second variant of the invention is the same as in the variant shown in FIGS. 1 and 2. To simplify matters, the same reference numerals are used for the same parts. The eccentric shaft section 20 of the drive shaft of a radial piston pump is rotatably supported in a pump housing (not shown) with the aid of a slide bearing 22. The eccentric movement of the drive shaft is transmitted via a ring or a polygon 21 to a plate 37 attached to the piston 19.
Bei dieser Variante der Erfindung wird jedoch als Plattenhalter lediglich ein Sprengring 38 verwendet. Der Sprengring 38 befindet sich in Anlage gegen einen Einstich 39, der an dem zu der Platte 37 gewandten Ende des Kolbens 19 vorgesehen ist. Benachbart zu dem Einstich 39 des Kolbens 19 ist in der Platte 37 eine Umfangsnut 40 ausgebildet. Die Tiefe der Umfangsnut 40 ist etwas größer als der Durchmesser des Querschnitts des Sprengrings 38. Dadurch wird die Montage der Platte 37 an dem Kolben 19 vereinfacht .In this variant of the invention, however, only a snap ring 38 is used as the plate holder. The snap ring 38 is in contact with a recess 39 which is provided on the end of the piston 19 facing the plate 37. A circumferential groove 40 is formed in the plate 37 adjacent to the recess 39 of the piston 19. The depth of the circumferential groove 40 is somewhat larger than the diameter of the cross section of the snap ring 38. This simplifies the mounting of the plate 37 on the piston 19.
Der Zusammenbau kann wie folgt vor sich gehen. Zunächst wird der Sprengring 38 in die Umfangsnut 40 der Platte 37 eingelegt. Daraufhin wird der Kolben 19 ähnlich wie bei einem Schnellverschluß in das Sackloch 41 eingesteckt, das in der Platte 37 ausgespart ist. Beim Einstecken des Kolbens 19 in das Sackloch 41 wird der Sprengring 38 zunächst in die Umfangsnut 40 gedrückt und schnappt dann in den Einstich 39.The assembly can proceed as follows. First, the snap ring 38 is inserted into the circumferential groove 40 of the plate 37. Thereupon, the piston 19 is inserted into the blind hole 41, which is recessed in the plate 37, similar to a quick-release fastener. When the piston 19 is inserted into the blind hole 41, the snap ring 38 is first pressed into the circumferential groove 40 and then snaps into the recess 39.
Bei der in den Figuren 4 - 7 dargestellten Variante der Erfindung ist in einer Platte 47 ein Sackloch 45 zur Aufnahme eines Kolbens 19 ausgespart. Wie man in Figur 4 sieht, erstrecken sich in der Platte 47 senkrecht zu dem Sackloch 45 zwei Bohrungen 48, 49. Die Mittellinien der Bohrungen 48, 49 haben einen Abstand voneinander, der dem Durchmesser des Kolbens 19 entspricht. Im zusammengebauten Zustand, d.h. wenn der Kolben 19 mit seinem Ende in der Platte 47 steckt, überdecken sich die Bohrungen 48, 49 teilweise mit einem Einstich 51, der an dem Kolben 19 vorgesehen ist.In the variant of the invention shown in FIGS. 4-7, a blind hole 45 for receiving a piston 19 is recessed in a plate 47. As can be seen in Figure 4, extend in the plate 47 perpendicular to that Blind hole 45 two bores 48, 49. The center lines of the bores 48, 49 are at a distance from one another which corresponds to the diameter of the piston 19. In the assembled state, ie when the piston 19 is inserted with its end in the plate 47, the bores 48, 49 partially overlap with a recess 51 which is provided on the piston 19.
Um die Platte 47 an dem Kolben 19 zu befestigen, sind zwei Stifte 55, 56 in den Bohrungen 48, 49 aufgenommen. Dabei ragen die Stifte 55, 56 von zwei Seiten in den Einstich 51 des Kolbens 19. Die beiden Stifte 55, 56 sind durch einen Steg 57 miteinander verbunden.In order to attach the plate 47 to the piston 19, two pins 55, 56 are received in the bores 48, 49. The pins 55, 56 protrude into the recess 51 of the piston 19 from two sides. The two pins 55, 56 are connected to one another by a web 57.
Wie man am besten in der separaten Darstellung in Figur 6 sieht, bilden die Stifte 55, 56 und der Steg 57 eine Klammer, die insgesamt mit 58 bezeichnet ist.As can best be seen in the separate illustration in FIG. 6, the pins 55, 56 and the web 57 form a bracket, which is designated overall by 58.
In Figur 7 ist die Klammer 58 im eingebauten Zustand gezeigt. In der dargestellten Ansicht sieht man, daß in der Platte 47 eine Ausnehmung 59 zur Aufnahme der Klammer 58 ausgebildet ist. Dabei dient ein Vorsprung 60, der an die Platte 47 angeformt ist, eine Sicherung, die den Steg 57 im eingebauten Zustand in seiner Lage fixiert. In Figure 7, the bracket 58 is shown in the installed state. In the view shown it can be seen that a recess 59 for receiving the clamp 58 is formed in the plate 47. In this case, a projection 60, which is molded onto the plate 47, serves as a securing device which fixes the web 57 in its position in the installed state.

Claims

Ansprüche Expectations
1. Radialkolbenpumpe zur Kraftstoffhochdruckerzeugung bei Kraftstoffeinspritzsystemen von Brennkraftmaschinen, insbesondere bei einem Common-Rail-Einspritzsystem, mit einer in einem Pumpengehäuse gelagerten Antriebswelle, die exzentrisch ausgebildet ist oder in Umfangsrichtung nockenartige Erhebungen aufweist, und mit vorzugsweise mehreren bezüglich der Antriebswelle radial in einer jeweiligen Elementbohrung angeordneten Kolben (19) , die durch Drehen der Antriebswelle in der jeweiligen Elementbohrung in radialer Richtung hin- und herbewegbar sind, wobei an den zur Antriebswelle gewandten Enden der Kolben (19) jeweils eine Platte (21) gehalten ist, dadurch gekennzeichnet, daß in der zu dem Kolben (19) gewandten Oberfläche der Platte (21) eine oder mehrere Ausnehmungen (16) angeordnet sind, in die im zusammengebauten Zustand Schnapphaken1. Radial piston pump for high-pressure fuel generation in fuel injection systems of internal combustion engines, in particular in a common rail injection system, with a drive shaft mounted in a pump housing, which is eccentrically formed or has cam-like elevations in the circumferential direction, and preferably several radially with respect to the drive shaft in a respective element bore Arranged pistons (19) which can be moved back and forth in the respective element bore in the radial direction by rotating the drive shaft, a plate (21) being held at the ends of the pistons (19) facing the drive shaft, characterized in that in one or more recesses (16) are arranged on the surface of the plate (21) facing the piston (19), into the snap hooks in the assembled state
(10 - 15) eingreifen, die an einem Plattenhalter (1) ausgebildet sind, der an dem zugehörigem Kolben (19) angebracht ist.(10-15) engage, which are formed on a plate holder (1) which is attached to the associated piston (19).
2. Radialkolbenpumpe zur Kraftstoffhochdruckerzeugung bei Kraftstoffeinspritzsystemen von Brennkraftmaschinen, insbesondere bei einem Common-Rail-Einspritzsystem, mit einer in einem Pumpengehäuse gelagerten Antriebswelle, die exzentrisch ausgebildet ist oder in Umfangsrichtung nockenartige Erhebungen aufweist, und mit vorzugsweise mehreren bezüglich der Antriebswelle radial in einer jeweiligen Elementbohrung angeordneten Kolben (19), die durch Drehen der Antriebswelle in der jeweiligen Elementbohrung in radialer Richtung hin- und herbewegbar sind, wobei an den zur Antriebswelle gewandten Enden der Kolben (19) jeweils eine Platte2. Radial piston pump for generating high fuel pressure in fuel injection systems of internal combustion engines, in particular in a common rail injection system, with a drive shaft mounted in a pump housing, which is eccentrically formed or has cam-like elevations in the circumferential direction, and preferably with a plurality with respect to the drive shaft Pistons (19) arranged radially in a respective element bore, which can be moved back and forth in the respective element bore in the radial direction by rotating the drive shaft, a plate at each end of the piston (19) facing the drive shaft
(21) gehalten ist, dadurch gekennzeichnet, daß in der zu dem Kolben (19) gewandten Oberfläche der Platte(21), characterized in that in the surface of the plate facing the piston (19)
(21) in der Mitte ein Sackloch (41) mit einer Umfangsnut (40) ausgespart ist, in die ein Sprengring (38) eingreift, der in einem Einstich (39) an dem(21) in the middle a blind hole (41) with a circumferential groove (40) is recessed into which a snap ring (38) engages, which is in a recess (39) on the
Kolben (19) gehalten ist.Piston (19) is held.
3. Radialkolbenpumpe zur Kraftstoffhochdruckεrzeugung bei Kraftstoffeinspritzsystemen von Brennkraftmaschinen, insbesondere bei einem Common-Rail-Einspritzsystem, mit einer in einem Pumpengehäuse gelagerten Antriebswelle, die exzentrisch ausgebildet ist oder in Umfangsrichtung nockenartige Erhebungen aufweist, und mit vorzugsweise mehreren bezüglich der Antriebswelle radial in einer jeweiligen Elementbohrung angeordneten3. Radial piston pump for generating fuel high pressure in fuel injection systems of internal combustion engines, in particular in a common rail injection system, with a drive shaft mounted in a pump housing, which is eccentrically formed or has cam-like elevations in the circumferential direction, and preferably with several in relation to the drive shaft radially in a respective element bore arranged
Kolben (19) , die durch Drehen der Antriebswelle in der jeweiligen Elementbohrung in radialer Richtung hin- und herbewegbar sind, wobei an den zur Antriebswelle gewandten Enden der Kolben (19) jeweils eine Platte (47) gehalten ist, dadurch gekennzeichnet, daß in der zu dem Kolben (19) gewandten Oberfläche der Platte (47) in der Mitte ein Sackloch (45) und zwei parallele Bohrungen (48, 49) ausgespart sind, die quer zu dem Sackloch (45) so verlaufen, daß die Mittellinien der Bohrungen (48, 49) die Mantelfläche des Sacklochs (45) tangieren, wobei die Bohrungen (48, 49) zur Aufnahme von zwei Stiften (55, 56) dienen, die im eingesetzten Zustand in einen Einstich (51) eingreifen, der an dem Kolben (19) angebracht ist. Pistons (19) which can be moved back and forth in the respective element bore in the radial direction by rotating the drive shaft, a plate (47) being held at the ends of the pistons (19) facing the drive shaft, characterized in that in the a blind hole (45) and two parallel bores (48, 49) are cut out in the middle towards the surface of the plate (47) facing the piston (19) and extend transversely to the blind hole (45) such that the center lines of the bores ( 48, 49) tangent to the lateral surface of the blind hole (45), the bores (48, 49) serving to receive two pins (55, 56) which, in the inserted state, engage in a recess (51) which is attached to the piston ( 19) is attached.
4. Radialkolbenpumpe nach Anspruch 3 , dadurch gekennzeichnet, daß die beiden Stifte (55, 56) durch einen Steg (57) zu einer Klammer (58) verbunden sind.4. Radial piston pump according to claim 3, characterized in that the two pins (55, 56) are connected by a web (57) to a bracket (58).
5. Radialkolbenpumpe nach Anspruch 4 , dadurch gekennzeichnet, daß der Steg (57) im eingesetzten Zustand der Klammer (58) durch einen Vorsprung (60) gesichert ist, der an der Platte (47) ausgebildet ist. 5. Radial piston pump according to claim 4, characterized in that the web (57) in the inserted state of the bracket (58) is secured by a projection (60) which is formed on the plate (47).
EP99922070A 1998-07-02 1999-03-24 Radial piston pump Withdrawn EP1144866A3 (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
DE19829546 1998-07-02
DE19829546A DE19829546A1 (en) 1998-07-02 1998-07-02 Radial piston pump
PCT/DE1999/000862 WO2000001948A2 (en) 1998-07-02 1999-03-24 Radial piston pump

Publications (2)

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EP1144866A2 true EP1144866A2 (en) 2001-10-17
EP1144866A3 EP1144866A3 (en) 2002-02-27

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US (1) US6523524B1 (en)
EP (1) EP1144866A3 (en)
JP (1) JP2002526704A (en)
DE (1) DE19829546A1 (en)
WO (1) WO2000001948A2 (en)

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DE10200792A1 (en) * 2002-01-11 2003-07-31 Bosch Gmbh Robert Fuel pump for an internal combustion engine
DE102005043266A1 (en) * 2004-10-15 2006-04-20 Continental Teves Ag & Co. Ohg piston pump
DE102006032244A1 (en) * 2006-07-12 2008-01-17 Siemens Ag Radial piston pump for high pressure fuel injection system, has high pressure piston formed as two-piece with cylindrical piston part and ring that are connected with each other in force-fitting and/or form-fitting manner
DE102014209833A1 (en) * 2014-05-23 2015-11-26 Schaeffler Technologies AG & Co. KG Position arrangement for an intermediate shaft in a separating clutch for a hybrid module with separate axial and radial bearing
DE102016203768B4 (en) * 2015-11-12 2017-10-26 Robert Bosch Gmbh Pump, in particular high-pressure pump of a fuel injection system, with a mounting assembly of plunger assembly and pump cylinder head, in particular by a latching connection between spring plate and plunger body
DE102016224835A1 (en) * 2016-12-13 2018-06-14 Robert Bosch Gmbh Pump, in particular high-pressure pump of a fuel injection system
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JP2002526704A (en) 2002-08-20
WO2000001948A2 (en) 2000-01-13
US6523524B1 (en) 2003-02-25
WO2000001948A3 (en) 2001-11-08
DE19829546A1 (en) 2000-01-13
EP1144866A3 (en) 2002-02-27

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