EP0774072A1 - Reciprocating pump - Google Patents

Reciprocating pump

Info

Publication number
EP0774072A1
EP0774072A1 EP96900275A EP96900275A EP0774072A1 EP 0774072 A1 EP0774072 A1 EP 0774072A1 EP 96900275 A EP96900275 A EP 96900275A EP 96900275 A EP96900275 A EP 96900275A EP 0774072 A1 EP0774072 A1 EP 0774072A1
Authority
EP
European Patent Office
Prior art keywords
eccentric
bow spring
pistons
reciprocating
pump according
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
EP96900275A
Other languages
German (de)
French (fr)
Other versions
EP0774072B1 (en
Inventor
Heinz Siegel
Ernst-Dieter Schaefer
Guenter Krenz
Dirk Merbold
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 EP0774072A1 publication Critical patent/EP0774072A1/en
Application granted granted Critical
Publication of EP0774072B1 publication Critical patent/EP0774072B1/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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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
    • F04B9/00—Piston machines or pumps characterised by the driving or driven means to or from their working members
    • F04B9/02—Piston machines or pumps characterised by the driving or driven means to or from their working members the means being mechanical
    • F04B9/04—Piston machines or pumps characterised by the driving or driven means to or from their working members the means being mechanical the means being cams, eccentrics or pin-and-slot mechanisms
    • F04B9/045—Piston machines or pumps characterised by the driving or driven means to or from their working members the means being mechanical the means being cams, eccentrics or pin-and-slot mechanisms the means being eccentrics
    • 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 reciprocating pump according to the type of the main claim.
  • Such a reciprocating piston pump is known from DE 22 43 137, in which two pistons are arranged facing away from one another radially to the axis of rotation of an eccentric located between them.
  • the pistons are pressed against a circumferential surface of the eccentric by a C-shaped bow spring which bulges around the circumference of the eccentric and both ends of which engage a piston.
  • these To engage the bow spring on the piston, these each have a transverse bore at their ends facing the eccentric, through which the ends of the bow spring are inserted.
  • the bow spring is elastically expanded, it is under tension and holds the pistons in contact with the circumferential surface of the eccentric.
  • a disadvantage of the known reciprocating pump is that the two pistons for mounting the bow spring so about their longitudinal axis must be rotated that their through holes are accessible through a mounting hole for the eccentric in the pump housing for inserting the ends of the bow spring. Furthermore, the bores of both pistons must be aligned parallel to each other in order to be able to insert the bow spring. Since the pistons have to be inserted into cylinder bores in the pump housing before mounting the bow spring, the pistons are only accessible from the outside end faces and inside the piston ends protruding into the mounting opening for the eccentric, so that the pistons are difficult to grasp for turning.
  • Reciprocating pump is difficult to carry out and is therefore time and cost intensive.
  • the reciprocating pump according to the invention with the features of claim 1 has the advantage that the bow spring can be mounted in any angular position of the two pistons, alignment by rotating the pistons around their longitudinal axes is unnecessary.
  • the hook-shaped eyelets are pressed with their opening mouths forward into the ring grooves on the mutually facing ends of the two pistons until they snap in there.
  • the snap connection between the bow spring and piston prevents the bow spring from loosening automatically. This allows a quick and easy assembly of the reciprocating pump according to the invention.
  • the bow spring is a simple bent wire part that can be manufactured quickly and cheaply without waste of material.
  • the bow spring continues over one of its two eyelets.
  • the extension preferably extends approximately in the tangential direction or in the circumferential direction with respect to the eccentric, it extends a region of the bow spring that is curved about the eccentric beyond the eyelet. Together with a stop surface of the pump housing, which is perpendicular to the
  • Rotation axis of the eccentric and is arranged with little or no distance from the extension and the curved area of the bow spring, the extension and the curved area prevent the bow spring from rotating in the annular grooves of the pistons about their longitudinal axis. At most a minimal swivel movement of the
  • Bow spring is possible. This prevents a free end of the bow spring from abutting an inner wall of the pump housing and removing chips from the pump housing during the lifting movement.
  • the free end on the eyelet of the bow spring, which has no extension, does not reach the plane in which the curved area or the extension is located.
  • the anti-twist device has the advantage that no special configuration of the pump housing or extra securing parts against twisting are necessary. It is therefore easy and inexpensive to implement.
  • Figure 2 shows an axial section through the reciprocating pump shown in Figure 1;
  • Figure 3 shows a bow spring in plan view
  • Figure 4 shows the bow spring of Figure 2 in view
  • Figure 5 shows a second embodiment of a bow spring in plan view
  • Figure 6 shows the bow spring of Figure 4 in view.
  • the reciprocating piston pump 10 shown in sections in FIGS. 1 and 2, has two pistons 12, which are coaxial and facing away from one another radially
  • Rotation axis 14 of an eccentric 16 located between them are arranged.
  • the two pistons 12 are displaceably guided in cylinders 18, which are inserted into a pump housing 20.
  • Mutually facing ends of the pistons 12 project from the cylinders 18 into an eccentric space 22 inside the
  • the eccentric space 22 is a flat, cylindrical cavity, the axis of which, which is also the axis of rotation 14 of the eccentric 16, intersects the longitudinal axes of the pistons 12 at right angles.
  • the cylinders 18 open vertically into a circumferential surface 24 of the eccentric space 22.
  • the ends of the pistons 12 projecting into the eccentric space 22 are each provided with an annular groove 26 for the engagement of a bow spring 28.
  • This bow spring 28 is elastically expanded in the assembled state, as shown in FIGS. 1 and 2, it is under prestress and presses facing end faces 30 of the pistons 12 from the outside against a circumferential surface of a bearing ring 32.
  • the bearing ring 32 is part of one the eccentric 16 attached ball bearings.
  • this ball bearing has bearing balls 34 which are held equidistantly on a cylindrical circumferential surface 38 of the eccentric 16 by a ball ring 36.
  • This ball bearing arrangement 32, 34, 36 serves to reduce the friction between the eccentric 16 and the piston 12.
  • one of the two pistons is shown in section in the groove base, the bearing ring 32 and the bow spring are shown in view.
  • the eccentric 14 is a cylindrical pin which is arranged in one piece with an eccentric shaft 40 and eccentrically with an eccentricity e at one end.
  • the eccentric 16 By rotating the eccentric shaft 40 by means of an electric motor (not shown), the eccentric 16 is driven to rotate about its axis of rotation 14, which is also the axis of rotation of the eccentric shaft 40.
  • the eccentric 16 drives the bearing ring 32 in a circular movement about the axis of rotation 14, the bearing ring 32 being decoupled from the rotation of the eccentric 16 via the bearing balls 34, the bearing ring 32 does not rotate during its circular movement. Due to its circular movement, the bearing ring 32 drives the &. Piston 12 adjacent to it back and forth
  • the bow spring 28 is shown in Figures 2 and 3, wherein Figure 3 is a view in the direction of arrow III in Figure 4.
  • the bow spring 28 is bent from round spring steel wire. It has a curved area 42 which, when the bow spring 28 (FIG. 1) is mounted, bulges around the circumference of the eccentric 16.
  • the bow spring 28 is bent into hook-shaped eyelets 44 which are open at one point on their circumference.
  • the eyelets 44 are located in planes that are perpendicular to a plane in which the curved region 42 is located.
  • the two planes in which the eyelets 44 are located are not parallel, but somewhat inclined to one another (FIG. 4). Due to the elastic expansion of the bow spring 28 during assembly, the two eyelets 44 are parallel to each other ( Figure 1).
  • the eyelets 44 are bent approximately at right angles to the curved area 42, so that the eyelets 44 open in the direction of the plane in which the curved area 42 is located.
  • the two eyelets 44 lie congruently one above the other.
  • the clear width at an opening mouth 48 is smaller than the diameter of the pistons 12 at the bottom of the annular groove 26, as a result of which the eyelet 44 is in contact with one another Introducing them into the annular groove 26 first expands elastically and then snaps in and no longer releases automatically.
  • a free end of the eyelet 44 is formed as a threading section 50, 51, in the area of which the clear width from the opening mouth 48 increases outwards.
  • the threading section 50, 51 serves to position the bow spring 42 for introducing its eyelets 44 into the annular grooves 26 of the pistons 12 and supports the elastic expansion of the eyelets 44.
  • the bow spring 28 On one of the two eyelets 44, the bow spring 28 has an extension 56 integral with it on its side facing away from the curved region 42. This is located in one plane with the curved region 42 and extends a bit approximately in the circumferential direction of the eccentric 16.
  • End wall 58 of the pump housing 20 delimiting the eccentric space 22 is located close to the curved area 42 and the extension 56 of the bow spring 28.
  • the end wall forming a stop surface 58 prevents the bow spring 28 from rotating in the annular grooves 26 of the pistons 12 and allows only one slight pivoting movement too ( Figure 2).
  • This free end 60 does not extend to the plane in which the curved region 42 and the extension 56 of the bow spring 28 are located (FIG. 3).
  • the pistons 12 are pushed into the cylinders 18 from the outside after the latter have been inserted into the pump housing 20.
  • the pistons 12 are pushed so far into the cylinder 18 that their mutually facing ends protrude into the eccentric space 22 and their annular grooves 26 are at a distance from one another which corresponds to the distance between the two eyelets 44 of the bow spring 28 in the relaxed state.
  • the bow spring 28 is then pressed with the opening mouths 48 of its eyelets 44 first into the annular grooves 26 until the eyelets 44 snap into the annular grooves 26.
  • the curved area 42 of the bow spring 28 extends laterally and does not interfere with the assembly.
  • Ball bearings 32, 34, 36 carrying eccentric 16 the pistons 12 must be pressed apart against the force of the bow spring 28, so that the bearing ring 32 can be brought between the mutually facing end faces 30 of the pistons 12.
  • the side of the bearing ring 32 facing away from the eccentric shaft 40 can be conical, as a result of which the bearing ring 32 presses the pistons 12 apart when the eccentric shaft 40 is inserted into the pump housing 20, which takes place in the direction of the axis of rotation 14 of the eccentric shaft 40.
  • FIGS. 5 and 6 show an embodiment of a bow spring 52 that is modified compared to FIGS. 3 and 4.
  • a curved region 54 of this bow spring 52 is shaped into a polygon instead of a continuous arc. Otherwise, this bow spring 54 is constructed in the same way as the bow spring 28 already described. For this reason, the bow spring 54 is not described again; the statements relating to the bow spring 28 shown in FIGS. 3 and 4 apply.
  • the bow spring 54 shown in FIGS. 5 and 6 is instead of the bow spring 28 shown in FIGS. 3 and 4 in the reciprocating piston pump 10 applicable.
  • This second embodiment of the bow spring 54 has the advantage that narrow manufacturing tolerances can be better maintained.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Reciprocating Pumps (AREA)
  • Details Of Reciprocating Pumps (AREA)

Abstract

The invention is based on a reciprocating pump (10) with two coaxially arranged pistons (12) in which a reciprocating movement can be induced by an eccentric (16) fitted between them and are held against the eccentric (16) by a stirrup spring (28) engaging with the pistons (12). For the purposes of easy fitting, the invention proposes that the stirrup spring (28) take the form of a bent wire section with two open, hook-shaped eyes at their ends inserted in annular grooves (26) in the pistons (12) and forming a snap connection therewith.

Description

Hubkolbenpumpe Reciprocating pump
Stand der TechnikState of the art
Die Erfindung geht aus von einer Hubkolbenpumpe nach der Gattung des Hauptanspruchs.The invention relates to a reciprocating pump according to the type of the main claim.
Aus der DE 22 43 137 ist eine derartige Hubkolbenpumpe bekannt, bei der zwei Kolben einander abgewandt radial zur Rotationsachse eines zwischen ihnen befindlichen Exzenters angeordnet sind. Die Kolben werden von einer C-fδrmigen Bügelfeder, die sich um den Umfang des Exzenters herum wölbt und deren beide Enden an jeweils einem Kolben angreifen, an einander gegenüberliegenden Stellen gegen eine Umfangsflache des Exzenters gedrückt. Zum Angreifen der Bügelfeder an den Kolben weisen diese je eine Querbohrung an ihrem dem Exzenter zugewandten Enden auf, durch welche die Enden der Bügelfeder gesteckt sind. Die Bügelfeder ist elastisch aufgeweitet, sie steht unter Vorspannung und hält die Kolben in Anlage an der Umfangsfl che des Exzenters. Durch rotierenden Antrieb des Exzenters um seine Rotationsachse werden die beiden Kolben in eine hin- und hergehende Hubbewegung versetzt, wobei jeweils ein Kolben einen Arbeits- und gleichzeitig der andere Kolben einen Ansaughub ausführt.Such a reciprocating piston pump is known from DE 22 43 137, in which two pistons are arranged facing away from one another radially to the axis of rotation of an eccentric located between them. The pistons are pressed against a circumferential surface of the eccentric by a C-shaped bow spring which bulges around the circumference of the eccentric and both ends of which engage a piston. To engage the bow spring on the piston, these each have a transverse bore at their ends facing the eccentric, through which the ends of the bow spring are inserted. The bow spring is elastically expanded, it is under tension and holds the pistons in contact with the circumferential surface of the eccentric. By rotating the eccentric around its axis of rotation, the two pistons are set in a reciprocating stroke movement, one piston performing a working stroke and the other piston simultaneously performing a suction stroke.
Von Nachteil bei der bekannten Hubkolbenpumpe ist, daß die beiden Kolben zur Montage der Bügelfeder so um ihre Längsachse gedreht werden müssen, daß ihre Durchgangsbohrungen durch eine Montageöffnung für den Exzenter im Pumpengehäuse zum Hineinstecken der Enden der Bügelfeder zugänglich sind. Weiterhin müssen die Bohrungen beider Kolben parallel zueinander ausgerichtet sein, um die Bügelfeder einstecken zu können. Da die Kolben vor dem Montieren der Bügelfeder in Zylinderbohrungen im Pumpengehäuse eingeschoben werden müssen, sind von den Kolben nur außen Stirnseiten und innen die in die Montageδffnung für den Exzenter vorstehenden Kolbenenden zugänglich, so daß die Kolben zum Drehen schlecht greifbar sind. Nach dem Einstecken der Bügelfederenden in die Bohrungen der Kolben muß die Bügelfeder mit den Kolben eine Vierteldrehung um die Längsachse der Kolben gedreht werden, damit der Exzenter im Bogen der Bügelfeder zwischen den beiden Kolben montiert werden kann. Die Montage der bekanntenA disadvantage of the known reciprocating pump is that the two pistons for mounting the bow spring so about their longitudinal axis must be rotated that their through holes are accessible through a mounting hole for the eccentric in the pump housing for inserting the ends of the bow spring. Furthermore, the bores of both pistons must be aligned parallel to each other in order to be able to insert the bow spring. Since the pistons have to be inserted into cylinder bores in the pump housing before mounting the bow spring, the pistons are only accessible from the outside end faces and inside the piston ends protruding into the mounting opening for the eccentric, so that the pistons are difficult to grasp for turning. After inserting the ends of the bow spring into the bores of the pistons, the bow spring with the pistons must be turned a quarter turn around the longitudinal axis of the pistons so that the eccentric can be mounted in the bow of the bow spring between the two pistons. The assembly of the known
Hubkolbenpumpe ist schwierig durchzuführen und dadurch zeit- und kostenintensiv.Reciprocating pump is difficult to carry out and is therefore time and cost intensive.
Vorteile der ErfindungAdvantages of the invention
Die erfindungsgemäße Hubkolbenpumpe mit den Merkmalen des Anspruchs 1 hat den Vorteil, daß die Bügelfeder in jeder Winkelstellung der beiden Kolben montiert werden kann, ein Ausrichten durch Drehen der Kolben um ihre Längsachsen erübrigt sich. Die hakenförmigen Ösen werden mit ihren Öffnungsmündern voran in die Ringnuten an den einander zugewandten Enden der beiden Kolben gedrückt, bis sie dort einschnappen. Die Schnappverbindung zwischen Bügelfeder und Kolben verhindert ein selbsttätiges Lösen der Bügelfeder. Dies erlaubt eine schnelle und einfache Montage der erfindungsgemäßen Hubkolbenpumpe. Die Bügelfeder ist ein einfaches Drahtbiegeteil, das sich schnell und billig ohne Werkstoffabfall herstellen läßt. Die Unteransprüche betreffen vorteilhafte Weiterbildungen und Verbesserungen der Erfindung.The reciprocating pump according to the invention with the features of claim 1 has the advantage that the bow spring can be mounted in any angular position of the two pistons, alignment by rotating the pistons around their longitudinal axes is unnecessary. The hook-shaped eyelets are pressed with their opening mouths forward into the ring grooves on the mutually facing ends of the two pistons until they snap in there. The snap connection between the bow spring and piston prevents the bow spring from loosening automatically. This allows a quick and easy assembly of the reciprocating pump according to the invention. The bow spring is a simple bent wire part that can be manufactured quickly and cheaply without waste of material. The subclaims relate to advantageous developments and improvements of the invention.
Bei einer Weiterbildung der Erfindung gemäß Anspruch 2 setzt sich die Bügelfeder über eine ihrer beiden Ösen hinweg fort. Der Fortsatz erstreckt sich vorzugsweise in etwa in tangentialer Richtung oder in Umfangsrichtung bezüglich des Exzenters, er verlängert einen um den Exzenter gekrümmten Bereich der Bügelfeder über die Öse hinaus. Zusammen mit einer Anschlagfläche des Pumpengehäuses, die senkrecht zurIn a development of the invention according to claim 2, the bow spring continues over one of its two eyelets. The extension preferably extends approximately in the tangential direction or in the circumferential direction with respect to the eccentric, it extends a region of the bow spring that is curved about the eccentric beyond the eyelet. Together with a stop surface of the pump housing, which is perpendicular to the
Rotationsachse des Exzenters und mit wenig oder ohne Abstand vom Fortsatz und dem gekrümmten Bereich der Bügelfeder angeordnet ist, verhindern der Fortsatz und der gekrümmte Bereich, daß sich die Bügelfeder in den Ringnuten der Kolben um deren Längsachse verdreht. Allenfalls eine minimale Schwenkbewegung derRotation axis of the eccentric and is arranged with little or no distance from the extension and the curved area of the bow spring, the extension and the curved area prevent the bow spring from rotating in the annular grooves of the pistons about their longitudinal axis. At most a minimal swivel movement of the
Bügelfeder ist möglich. Dadurch wird vermieden, daß ein freies Ende der Bügelfeder gegen eine Innenwand des Pumpengehäuses stößt und bei der Hubbewegung Späne vom Pumpengehäuse abträg . Das freie Ende an der Öse der Bügelfeder, die keinen Fortsatz aufweist, reicht nicht bis an die Ebene, in welcher sich der gekrümmte Bereich bzw. der Fortsatz befinden. Die Verdrehsicherung hat den Vorteil, daß keinerlei besondere Ausgestaltung des Pumpengehäuses oder extra Sicherungsteile gegen Verdrehen notwendig sind. Sie ist daher einfach und billig zu verwirklichen.Bow spring is possible. This prevents a free end of the bow spring from abutting an inner wall of the pump housing and removing chips from the pump housing during the lifting movement. The free end on the eyelet of the bow spring, which has no extension, does not reach the plane in which the curved area or the extension is located. The anti-twist device has the advantage that no special configuration of the pump housing or extra securing parts against twisting are necessary. It is therefore easy and inexpensive to implement.
Zeichnungdrawing
Die Erfindung wird nachfolgend anhand eines Ausführungsbeispiels näher erläutert, das in der Zeichnung dargestellt ist. Es zeigen: Figur 1 einen Schnitt durch eine erfindungsgemäße Hubkolbenpumpe im Bereich eines Exzenters;The invention is explained in more detail below using an exemplary embodiment which is illustrated in the drawing. Show it: 1 shows a section through a reciprocating piston pump according to the invention in the region of an eccentric;
Figur 2 einen Achsschnitt durch die in Figur 1 dargestellte Hubkolbenpumpe;Figure 2 shows an axial section through the reciprocating pump shown in Figure 1;
Figur 3 eine Bügelfeder in Draufsicht;Figure 3 shows a bow spring in plan view;
Figur 4 die Bügelfeder aus Figur 2 in Ansicht;Figure 4 shows the bow spring of Figure 2 in view;
Figur 5 eine zweite Ausführungsform einer Bügelfeder in Draufsicht; undFigure 5 shows a second embodiment of a bow spring in plan view; and
Figur 6 die Bügelfeder aus Figur 4 in Ansicht.Figure 6 shows the bow spring of Figure 4 in view.
Beschreibung des AusführungsbeispielsDescription of the embodiment
Die in Figuren 1 und 2 ausschnittsweise dargestellte, erfindungsgemäße Hubkolbenpumpe 10 weist zwei Kolben 12 auf, die koaxial und einander abgewandt radial zu einerThe reciprocating piston pump 10 according to the invention, shown in sections in FIGS. 1 and 2, has two pistons 12, which are coaxial and facing away from one another radially
Rotationsachse 14 eines zwischen ihnen befindlichen Exzenters 16 angeordnet sind. Die beiden Kolben 12 sind in Zylindern 18, welche in ein Pumpengehäuse 20 eingesetzt sind, verschiebbar geführt. Einander zugewandte Enden der Kolben 12 stehen aus den Zylindern 18 in einen Exzenterraum 22 im Innern desRotation axis 14 of an eccentric 16 located between them are arranged. The two pistons 12 are displaceably guided in cylinders 18, which are inserted into a pump housing 20. Mutually facing ends of the pistons 12 project from the cylinders 18 into an eccentric space 22 inside the
Pumpengehäuses 20 vor. Der Exzenterraum 22 ist ein flacher, zylindrischer Hohlraum, dessen Achse, die zugleich die Rotationsachse 14 des Exzenters 16 ist, Längsachsen der Kolben 12 rechtwinklig schneidet. Die Zylinder 18 münden senkrecht in eine Umfangsflache 24 des Exzenterraums 22. Die in den Exzenterraum 22 ragenden Enden der Kolben 12 sind jeweils mit einer Ringnut 26 für den Eingriff einer Bügelfeder 28 versehen. Diese Bügelfeder 28 ist in montiertem Zustand, wie er in Figuren 1 und 2 gezeigt ist, elastisch aufgeweitet, sie steht unter Vorspannung und drückt einander zugewandte Stirnflächen 30 der Kolben 12 von außen gegen eine Umfangsflache eines Lagerrings 32. Der Lagerring 32 ist Bestandteil eines auf dem Exzenter 16 angebrachten Kugellagers. Dieses Kugellager weist neben dem Lagerring 32 Lagerkugeln 34 auf, die von einem Kugelring 36 äquidistant auf einer zylindrischen Umfangsflache 38 des Exzenters 16 gehalten sind. Diese Kugellägeranordnung 32, 34, 36 dient der Verminderung der Reibung zwischen dem Exzenter 16 und den Kolben 12. In Figur 2 ist einer der beiden Kolben im Nutgrund geschnitten dargestellt, der Lagerring 32 sowie die Bügelfeder sind in Ansicht gezeigt.Pump housing 20 before. The eccentric space 22 is a flat, cylindrical cavity, the axis of which, which is also the axis of rotation 14 of the eccentric 16, intersects the longitudinal axes of the pistons 12 at right angles. The cylinders 18 open vertically into a circumferential surface 24 of the eccentric space 22. The ends of the pistons 12 projecting into the eccentric space 22 are each provided with an annular groove 26 for the engagement of a bow spring 28. This bow spring 28 is elastically expanded in the assembled state, as shown in FIGS. 1 and 2, it is under prestress and presses facing end faces 30 of the pistons 12 from the outside against a circumferential surface of a bearing ring 32. The bearing ring 32 is part of one the eccentric 16 attached ball bearings. In addition to the bearing ring 32, this ball bearing has bearing balls 34 which are held equidistantly on a cylindrical circumferential surface 38 of the eccentric 16 by a ball ring 36. This ball bearing arrangement 32, 34, 36 serves to reduce the friction between the eccentric 16 and the piston 12. In FIG. 2, one of the two pistons is shown in section in the groove base, the bearing ring 32 and the bow spring are shown in view.
Der Exzenter 14 ist ein zylindrischer Zapfen, der einstückig mit einer Exzenterwelle 40 und exzentrisch mit einer Exzentrizität e an deren einem Ende angeordnet ist. Durch rotierenden Antrieb der Exzenterwelle 40 mittels eines nicht dargestellten Elektromotors wird der Exzenter 16 zu einer Drehbewegung um seine Rotationsachse 14, die zugleich Rotationsachse der Exzenterwelle 40 ist, angetrieben. Über die Lagerkugeln 34 treibt der Exzenter 16 den Lagerring 32 zu einer Kreisbewegung um die Rotationsachse 14 an, wobei der Lagerring 32 über die Lagerkugeln 34 von der Drehung des Exzenters 16 entkoppelt ist, der Lagerring 32 dreht sich nicht bei seiner Kreisbewegung. Durch seine Kreisbewegung treibt der Lagerring 32 die &. ihm anliegenden Kolben 12 zu einer Hin- undThe eccentric 14 is a cylindrical pin which is arranged in one piece with an eccentric shaft 40 and eccentrically with an eccentricity e at one end. By rotating the eccentric shaft 40 by means of an electric motor (not shown), the eccentric 16 is driven to rotate about its axis of rotation 14, which is also the axis of rotation of the eccentric shaft 40. Via the bearing balls 34, the eccentric 16 drives the bearing ring 32 in a circular movement about the axis of rotation 14, the bearing ring 32 being decoupled from the rotation of the eccentric 16 via the bearing balls 34, the bearing ring 32 does not rotate during its circular movement. Due to its circular movement, the bearing ring 32 drives the &. Piston 12 adjacent to it back and forth
Herbewegung an, die den Arbeits- und den Saughub der Kolben 12 darstellt. Die Bügelfeder 28 ist in Figuren 2 und 3 dargestellt, wobei Figur 3 eine Ansicht in Richtung des Pfeils III in Figur 4 darstellt. Die Bügelfeder 28 ist aus Federstahl-Runddraht gebogen. Sie weist einen gekrümmten Bereich 42 auf, der sich bei montierter Bügelfeder 28 (Figur 1) um den Umfang des Exzenters 16 wölbt.Movement on, which represents the working and suction stroke of the piston 12. The bow spring 28 is shown in Figures 2 and 3, wherein Figure 3 is a view in the direction of arrow III in Figure 4. The bow spring 28 is bent from round spring steel wire. It has a curved area 42 which, when the bow spring 28 (FIG. 1) is mounted, bulges around the circumference of the eccentric 16.
An beiden Enden ihres gekrümmten Bereichs 42 ist die Bügelfeder 28 zu hakenförmigen Ösen 44 gebogen, die an einer Stelle ihres Umfangs offen sind. Die Ösen 44 befinden sich in Ebenen, die senkrecht zu einer Ebene stehen, in welcher sich der gekrümmte Bereich 42 befindet. Die beiden Ebenen, in welchen sich die Ösen 44 befinden, sind nicht parallel, sondern etwas geneigt zueinander (Figur 4) . Durch die elastische Aufweitung der Bügelfeder 28 bei der Montage stehen die beiden Ösen 44 parallel zueinander (Figur 1) . In der Draufsicht auf die Bügelfeder 28 (Figur 3) sind die Ösen 44 in etwa rechtwinklig zum gekrümmten Bereich 42 abgebogen, so daß sich die Ösen 44 in Richtung der Ebene, in der sich der gekrümmte Bereich 42 befindet, öffnen. Die beiden Ösen 44 liegen deckungsgleich übereinander. Sie haben eine Kreisbogenform, ihr Innendurchmesser ist etwas größer als ein Nutgrunddurchmesser der Ringnut 26 der Kolben 12. Die Ösen 44 der Bügelfeder 28 liegen dadurch an einer Nutflanke 46 der Ringnut 26 an, die dem Lagerring 32 benachbart ist. Diese Nutflanke 46 ist sphärisch ausgebildet. Dies hat den Vorteil, daß die Ösen 44 trotz unvermeidbarer Formfehler der Bügelfeder 28 gleichmäßig an der Nutflanke 46 anliegt.At both ends of its curved area 42, the bow spring 28 is bent into hook-shaped eyelets 44 which are open at one point on their circumference. The eyelets 44 are located in planes that are perpendicular to a plane in which the curved region 42 is located. The two planes in which the eyelets 44 are located are not parallel, but somewhat inclined to one another (FIG. 4). Due to the elastic expansion of the bow spring 28 during assembly, the two eyelets 44 are parallel to each other (Figure 1). In the top view of the bow spring 28 (FIG. 3), the eyelets 44 are bent approximately at right angles to the curved area 42, so that the eyelets 44 open in the direction of the plane in which the curved area 42 is located. The two eyelets 44 lie congruently one above the other. They have a circular arc shape, their inner diameter is slightly larger than a groove base diameter of the annular groove 26 of the pistons 12. The eyelets 44 of the bow spring 28 are thereby in contact with a groove flank 46 of the annular groove 26, which is adjacent to the bearing ring 32. This groove flank 46 is spherical. This has the advantage that the eyelets 44 lie evenly against the groove flank 46 despite the unavoidable shape errors of the bow spring 28.
Die lichte Weite an einem Öffnungsmund 48, dies ist die engste Stelle der offenen Ösen 44, ist kleiner als der Durchmesser der Kolben 12 am Grund der Ringnut 26, wodurch sich die Öse 44 beim Einbringen in die Ringnut 26 zunächst elastisch aufweitet und dann einschnappt und nicht mehr selbsttätig löst. Zum leichteren Einbringen der Öse 44 in die Ringnut 26 ist ein freies Ende der Öse 44 als Einfädelabschnitt 50, 51 ausgebildet, in dessen Bereich sich die lichte Weite vom Öffnungsmund 48 nach außen vergrößert. Der Einfädelabschnitt 50, 51 dient der Positionierung der Bügelfeder 42 zum Einbringen ihrer Ösen 44 in die Ringnuten 26 der Kolben 12 und unterstützt das elastische Aufweiten der Ösen 44.The clear width at an opening mouth 48, this is the narrowest point of the open eyelets 44, is smaller than the diameter of the pistons 12 at the bottom of the annular groove 26, as a result of which the eyelet 44 is in contact with one another Introducing them into the annular groove 26 first expands elastically and then snaps in and no longer releases automatically. To make it easier to insert the eyelet 44 into the annular groove 26, a free end of the eyelet 44 is formed as a threading section 50, 51, in the area of which the clear width from the opening mouth 48 increases outwards. The threading section 50, 51 serves to position the bow spring 42 for introducing its eyelets 44 into the annular grooves 26 of the pistons 12 and supports the elastic expansion of the eyelets 44.
An einer der beiden Ösen 44 weist die Bügelfeder 28 einen mit ihr einstückigen Fortsatz 56 an ihrer dem gekrümmten Bereich 42 abgewandten Seite auf. Dieser befindet sich in einer Ebene mit dem gekrümmten Bereich 42 und erstreckt sich ein Stück weit ungefähr in Umfangsrichtung des Exzenters 16. Eine denOn one of the two eyelets 44, the bow spring 28 has an extension 56 integral with it on its side facing away from the curved region 42. This is located in one plane with the curved region 42 and extends a bit approximately in the circumferential direction of the eccentric 16. The one
Exzenterraum 22 begrenzende Stirnwand 58 des Pumpengehäuses 20 befindet sich dicht an dem gekrümmten Bereich 42 und dem Fortsatz 56 der Bügelfeder 28. Die eine Anschlagfläche 58 bildende Stirnwand verhindert, daß sich die Bügelfeder 28 in den Ringnuten 26 der Kolben 12 drehen kann und läßt lediglich eine geringe Schwenkbewegung zu (Figur 2) . Dadurch wird verhindert, daß ein freies Ende 60 an der keinen Fortsatz aufweisenden Öse 44 der Bügelfeder 28 gegen die Stirnwand 58 des Pumpengehäuses 20 stößt und bei der Hin- und Herbewegung der Kolben Späne abträgt. Dieses freie Ende 60 reicht nicht bis zu der Ebene, in welcher sich der gekrümmte Bereich 42 und der Fortsatz 56 der Bügelfeder 28 befinden (Figur 3) .End wall 58 of the pump housing 20 delimiting the eccentric space 22 is located close to the curved area 42 and the extension 56 of the bow spring 28. The end wall forming a stop surface 58 prevents the bow spring 28 from rotating in the annular grooves 26 of the pistons 12 and allows only one slight pivoting movement too (Figure 2). This prevents a free end 60 from bumping against the end wall 58 of the pump housing 20 at the eyelet 44 of the bow spring 28, which eyelet does not have an extension, and from removing chips during the reciprocating movement of the pistons. This free end 60 does not extend to the plane in which the curved region 42 and the extension 56 of the bow spring 28 are located (FIG. 3).
Zur Montage der erfindungsgemäßen Hubkolbenpumpe 10 werden die Kolben 12 von außen in die Zylinder 18 geschoben, nachdem letztere in das Pumpengehäuse 20 eingesetzt worden sind. Die Kolben 12 werden so weit in die Zylinder 18 geschoben, daß ihre einander zugewandten Enden in den Exzenterraum 22 ragen und ihre Ringnuten 26 einen Abstand voneinander aufweisen, der dem Abstand der beiden Ösen 44 der Bügelfeder 28 in entspanntem Zustand entspricht. Anschließend wird die Bügelfeder 28 mit den Öffnungsmündern 48 ihrer Ösen 44 voran in die Ringnuten 26 gedrückt, bis die Ösen 44 in den Ringnuten 26 einschnappen. Der gekrümmte Bereich 42 der Bügelfeder 28 verläuft dabei seitlich und stört die Montage nicht.To assemble the reciprocating piston pump 10 according to the invention, the pistons 12 are pushed into the cylinders 18 from the outside after the latter have been inserted into the pump housing 20. The pistons 12 are pushed so far into the cylinder 18 that their mutually facing ends protrude into the eccentric space 22 and their annular grooves 26 are at a distance from one another which corresponds to the distance between the two eyelets 44 of the bow spring 28 in the relaxed state. The bow spring 28 is then pressed with the opening mouths 48 of its eyelets 44 first into the annular grooves 26 until the eyelets 44 snap into the annular grooves 26. The curved area 42 of the bow spring 28 extends laterally and does not interfere with the assembly.
Zur nachfolgenden Montage der Exzenterwelle 40 mit dem dasFor the subsequent assembly of the eccentric shaft 40 with the
Kugellager 32, 34, 36 tragenden Exzenter 16 müssen die Kolben 12 gegen die Kraft der Bügelfeder 28 auseinandergedrückt werden, so daß der Lagerring 32 zwischen die einander zugewandten Stirnflächen 30 der Kolben 12 gebracht werden kann. Zum Auseinanderdrücken der Kolben 12 kann die der Exzenterwelle 40 abgewandte Seite des Lagerrings 32 konisch ausgebildet sein, wodurch der Lagerring 32 beim Einsetzen der Exzenterwelle 40 in das Pumpengehäuse 20, das in Richtung der Rotationsachse 14 der Exzenterwelle 40 erfolgt, die Kolben 12 auseinanderdrückt.Ball bearings 32, 34, 36 carrying eccentric 16, the pistons 12 must be pressed apart against the force of the bow spring 28, so that the bearing ring 32 can be brought between the mutually facing end faces 30 of the pistons 12. To push the pistons 12 apart, the side of the bearing ring 32 facing away from the eccentric shaft 40 can be conical, as a result of which the bearing ring 32 presses the pistons 12 apart when the eccentric shaft 40 is inserted into the pump housing 20, which takes place in the direction of the axis of rotation 14 of the eccentric shaft 40.
Die Figuren 5 und 6 zeigen eine gegenüber den Figuren 3 und 4 abgewandelte Ausführung einer Bügelfeder 52. Ein gekrümmter Bereich 54 dieser Bügelfeder 52 ist zu einem Polygonzug anstelle eines stetigen Bogens geformt. Ansonsten ist diese Bügelfeder 54 gleich wie die bereits beschriebene Bügelfeder 28 aufgebaut. Die Bügelfeder 54 wird aus diesem Grunde nicht nochmal beschrieben, es gelten die Ausführungen zu der in Figuren 3 und 4 dargestellten Bügelfeder 28. Die in Figuren 5 und 6 dargestellte Bügelfeder 54 ist anstelle der in Figuren 3 und 4 dargestellten Bügelfeder 28 in die Hubkolbenpumpe 10 einsetzbar. Diese zweite Ausgestaltung der Bügelfeder 54 hat den Vorteil, daß sich enge Herstellungstoleranzen besser einhalten lassen. FIGS. 5 and 6 show an embodiment of a bow spring 52 that is modified compared to FIGS. 3 and 4. A curved region 54 of this bow spring 52 is shaped into a polygon instead of a continuous arc. Otherwise, this bow spring 54 is constructed in the same way as the bow spring 28 already described. For this reason, the bow spring 54 is not described again; the statements relating to the bow spring 28 shown in FIGS. 3 and 4 apply. The bow spring 54 shown in FIGS. 5 and 6 is instead of the bow spring 28 shown in FIGS. 3 and 4 in the reciprocating piston pump 10 applicable. This second embodiment of the bow spring 54 has the advantage that narrow manufacturing tolerances can be better maintained.

Claims

Patentansprüche claims
1. Hubkolbenpumpe mit einem Gehäuse, in welchem zwei Kolben einander gegenüberliegend in etwa radial zu einer Rotationsachse eines rotierend antreibbaren Exzenters angeordnet sind und mit einer aus Draht gebogenen Bügelfeder, die in Umfangsrichtung um den Exzenter gekrümmt ist und die mit ihren beiden Enden an dem Exzenter zugewandten Enden der beiden Kolben angreift und diese gegen eine Umfangsfl che des Exzenters drückt, dadurch gekennzeichnet, daß die dem Exzenter (16) zugewandten Kolbenenden Ringnuten (26) aufweisen, und daß die beiden Enden der Bügelfeder (28, 52) als offene, hakenförmige Ösen (44) ausgebildet sind, die einen Nutgrund umgreifend in die Ringnuten (26) der Kolben (12) eingreifen und die Öffnungsmünder (48) aufweisen, deren lichte Weite kleiner als der Kolbendurchmesser am Ringnutgrund ist.1. Reciprocating piston pump with a housing in which two pistons are arranged opposite one another approximately radially to an axis of rotation of a rotatably drivable eccentric and with a bow spring bent from wire, which is curved in the circumferential direction around the eccentric and with its two ends on the eccentric facing ends of the two pistons and pressing them against a peripheral surface of the eccentric, characterized in that the eccentric (16) facing piston ends have annular grooves (26), and that the two ends of the bow spring (28, 52) are open, hook-shaped Eyes (44) are formed, which engage around a groove base in the annular grooves (26) of the pistons (12) and have the opening mouths (48), the clear width of which is smaller than the piston diameter on the annular groove base.
2. Hubkolbenpumpe nach Anspruch 1, dadurch gekennzeichnet, daß die Bügelfeder (28, 52) einen Fortsatz (56) an einer ihrer beiden Ösen (44) an einer einem um den Exzenter (16) gekrümmten Bereich (42, 54) der Bügelfeder (28, 52) abgewandten Seite der Öse (44) aufweist, der sich mit dem gekrümmten Bereich (42, 54) in oder nahezu in einer Ebene befindet, und daß das Pumpengehäuse (20) eine in etwa senkrecht zu einer Rotationsachse (14) des Exzenters (16) angeordnete Anschlagfläche (58) aufweist, die allenfalls einen kleinen Abstand zu dem gekrümmten Bereich (42, 54) und dem Fortsatz (56) der Bügelfeder (28, 52) hat.2. Reciprocating piston pump according to claim 1, characterized in that the bow spring (28, 52) has an extension (56) on one of its two eyelets (44) on a region around the eccentric (16) (42, 54) of the bow spring ( 28, 52) facing away from the eyelet (44), which is located in or almost in one plane with the curved region (42, 54), and that the pump housing (20) is approximately perpendicular to an axis of rotation (14) of the Eccentric (16) arranged Has stop surface (58), which is at most a small distance from the curved area (42, 54) and the extension (56) of the bow spring (28, 52).
3. Hubkolbenpumpe nach Anspruch 1 oder 2, dadurch gekennzeichnet, daß die Öffnungsmünder (48) in etwa parallel zu einer Ebene ausgerichtet sind, in der sich der gekrümmte Bereich (42; 54) der Bügelfeder (28; 52) befindet.3. Reciprocating pump according to claim 1 or 2, characterized in that the opening mouths (48) are aligned approximately parallel to a plane in which the curved region (42; 54) of the bow spring (28; 52) is located.
4. Hubkolbenpumpe nach einem der Ansprüche 1 bis 3, dadurch gekennzeichnet, daß die Ösen (44) über die Öffnungsmünder (48), welche eine engste Stelle bilden, hinaus in einen sich erweiternden Einfädelabschnitt (50) übergehen.4. Reciprocating piston pump according to one of claims 1 to 3, characterized in that the eyelets (44) on the opening mouths (48), which form a narrowest point, pass into an expanding threading section (50).
5. Hubkolbenpumpe nach einem der Ansprüche 1 bis 4, dadurch gekennzeichnet, daß der gekrümmte Bereich (54) polygonfόrmig gebogen ist.5. Reciprocating piston pump according to one of claims 1 to 4, characterized in that the curved region (54) is bent polygon-shaped.
6. Hubkolbenpumpe nach einem der Ansprüche 1 bis 5, dadurch gekennzeichnet, daß sich die beiden Ösen (44) bei eingebauter6. Reciprocating pump according to one of claims 1 to 5, characterized in that the two eyes (44) when installed
Bügelfeder (28; 52) in zwei in etwa zueinander parallelen Ebenen befinden.Bow spring (28; 52) in two approximately parallel planes.
7. Hubkolbenpumpe nach einem der Ansprüche 1 bis 6, dadurch gekennzeichnet, daß dem Exzenter (16) benachbarte7. Reciprocating pump according to one of claims 1 to 6, characterized in that the eccentric (16) adjacent
Nutwangenflächen (46) der Ringnuten (26) konvex gewölbt, insbesondere kugelförmig ausgebildet sind. Grooved cheek surfaces (46) of the annular grooves (26) are convexly curved, in particular are spherical.
EP96900275A 1995-02-03 1996-01-17 Reciprocating pump Expired - Lifetime EP0774072B1 (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
DE19503621A DE19503621A1 (en) 1995-02-03 1995-02-03 Reciprocating pump
DE19503621 1995-02-03
PCT/DE1996/000046 WO1996023974A1 (en) 1995-02-03 1996-01-17 Reciprocating pump

Publications (2)

Publication Number Publication Date
EP0774072A1 true EP0774072A1 (en) 1997-05-21
EP0774072B1 EP0774072B1 (en) 1998-06-17

Family

ID=7753153

Family Applications (1)

Application Number Title Priority Date Filing Date
EP96900275A Expired - Lifetime EP0774072B1 (en) 1995-02-03 1996-01-17 Reciprocating pump

Country Status (6)

Country Link
US (1) US5897302A (en)
EP (1) EP0774072B1 (en)
JP (1) JP3883570B2 (en)
CN (1) CN1145657A (en)
DE (2) DE19503621A1 (en)
WO (1) WO1996023974A1 (en)

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Also Published As

Publication number Publication date
JP3883570B2 (en) 2007-02-21
WO1996023974A1 (en) 1996-08-08
US5897302A (en) 1999-04-27
DE19503621A1 (en) 1996-08-08
JPH09511307A (en) 1997-11-11
EP0774072B1 (en) 1998-06-17
CN1145657A (en) 1997-03-19
DE59600286D1 (en) 1998-07-23

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