EP0108944B1 - Positive displacement member of a piston pump - Google Patents
Positive displacement member of a piston pump Download PDFInfo
- Publication number
- EP0108944B1 EP0108944B1 EP83110319A EP83110319A EP0108944B1 EP 0108944 B1 EP0108944 B1 EP 0108944B1 EP 83110319 A EP83110319 A EP 83110319A EP 83110319 A EP83110319 A EP 83110319A EP 0108944 B1 EP0108944 B1 EP 0108944B1
- Authority
- EP
- European Patent Office
- Prior art keywords
- piston
- blind hole
- threaded
- recess
- adapter
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired
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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
- F04B53/00—Component parts, details or accessories not provided for in, or of interest apart from, groups F04B1/00 - F04B23/00 or F04B39/00 - F04B47/00
- F04B53/14—Pistons, piston-rods or piston-rod connections
- F04B53/144—Adaptation of piston-rods
- F04B53/147—Mounting or detaching of piston rod
Definitions
- the invention relates to a displacement part of a piston pump for abrasive and / or corrosive liquids, consisting of a piston rod and a piston attached to it by means of a releasable connection made of an oxide-ceramic material, the piston having a blind hole running in the direction of the piston head.
- Pump pistons of high-pressure pumps for washing units are subject to high loads.
- the pumps are generally designed as piston pumps, in which 2-6 cylinders work on a crankshaft. They reach pressures between 80 and 180 bar. lie. Sharp alkalis are usually used as the cleaning liquid. The temperatures of the cleaning liquids are 80 and more degrees C.
- the coated or hard chrome-plated steel sleeves previously used as pistons were connected to the piston rod by means of a clamping screw. As an alternative to these steel sleeves, corresponding sleeves made of sintered oxide ceramic were used, which were connected in an analogous manner.
- a stainless material i.e. generally a high-alloy steel, was used as the metal for the piston rod.
- the arrangement of the O-ring for the seal also required grinding a chamfer in the engagement area of the O-ring in the ceramic tube in order to prevent the risk of the O-ring being crushed during assembly.
- the crushing resulted in a defective seal, which led to corrosion inside the piston or to the piston being destroyed by higher internal pressure in the suction stroke.
- Even the attachment of the chamfer did not completely prevent the risk of an O-ring being crushed during quick assembly. Since the pistons have to be loosened after a certain working time in order to replace the worn sealing sleeves that slide on this piston, it is absolutely essential that the connection between the piston and the piston rod cannot corrode, i. H. must be completely separated from the medium.
- oxide ceramic materials or oxide ceramics in the sense of the present invention is the short name for ceramics of pure oxides, oxide compounds and oxide mixtures, insofar as they are almost free of SiO 2 , this term serving as a differentiation from conventional silicate ceramics.
- this term is to be understood as meaning sintered products made from the oxides of aluminum, beryllium, magnesium, zirconium and thorium as well as spinel, ie MgO, A1 2 0 3 .
- the term also includes the titanates and uranium oxide, rare earth oxides, and some heavy metal oxides, all of which are used in high purity. However, the term high purity does not exclude that certain percentages of several oxides are mixed together and then sintered.
- Oxide ceramic materials such as aluminum oxide
- Oxide ceramic materials are sintered according to the aluminum oxide content of the materials at temperatures above 1,500 ° C.
- the parts manufactured as green bodies initially shrink considerably. H. in the range of 18 to 23%.
- this shrinkage is not completely uniform everywhere, especially not if there are different wall thicknesses.
- such a complex method cannot be implemented for a simple body such as that represented by a pump piston for reasons of price.
- the prior art therefore envisaged sintering ceramic tubes, which were ground on both faces and could be screwed onto the piston rod by means of a bolt.
- the disadvantage of this construction is the complicated sealing, without which the piston cannot be released. It was also necessary to grind both end faces.
- the invention is therefore based on the object of finding a connection between the piston and the piston rod, which can be released after a long period of time even when used in corrosive and abrasive media, and to reduce the grinding work during piston production.
- the invention has a number of advantages. First the number after the sintering process. the area of the piston to be machined reduced to two, d. H. only the outer surface and the end face of the piston foot have to be machined.
- the blind hole and the recess are made in the piston in the green state and, like the piston crown, do not require any reworking after the sintering process.
- the tolerances of the blind hole and the recess are therefore relatively large, because the required fit, that is to say the alignment of the piston, only takes place on the adapter.
- a preferred embodiment of the invention provides for the adapter to center the piston foot. It is therefore an external centering of the piston, in which there is enough play for the threaded elements without losing the accuracy of the centering.
- the adapter is expediently provided with a threaded pin which is screwed through the blind hole into the threaded piece.
- the threaded piece itself expediently consists of a simple piece of round steel which is drilled perpendicularly to its longitudinal extent and is threaded. Instead of a round steel, any profile steel can be used that has a threaded hole. It is only important that the threaded pin of the adapter has enough play in the blind hole and that the threaded piece in the recess has enough play to allow attachment.
- the adapter is to be connected to the piston rod, which is expediently carried out by plugging the piston rod onto or into the adapter; however, it is also possible to provide this connection as a screw connection.
- the piston 2 made of sintered oxide ceramic has a chamfer 17 in the region of the piston head 3, to which the jacket 6 of the piston 2 is connected.
- a blind hole 5 extends from the piston foot 4 in the direction of the piston head 3, which was introduced in the green state of the piston 2, without a machining step following after the sintering process. This blind hole 5 is cut perpendicularly from the recess 7, which was also made by drilling in the green state of the piston 2.
- this recess 7 is the threaded piece 8, a piece of round steel chamfered on both sides, which has been provided with a threaded bore 18 in the center.
- the threaded pin 10, which is part of the adapter 9, is screwed into the threaded bore 18 of the threaded piece 8 and thereby connects the piston 2 to the adapter 9.
- the adapter 9 in turn is provided with a threaded shoulder 11 on the side opposite the threaded pin 10 which the piston rod 1 is screwed on.
- An alternative solution is shown in FIG. 2, where a machine screw 12 is used instead of the threaded pin 10, which penetrates the bore 13 in the adapter 9 and engages in the threaded piece 8.
- a countersink 14 connects to the bore 13 and receives the head of the machine screw 12.
- the adapter 9 is provided with a shoulder 16 onto which the piston rod 1, which is designed as a tube, is pushed and fastened by means of a notch pin 15.
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Details Of Reciprocating Pumps (AREA)
- Pistons, Piston Rings, And Cylinders (AREA)
- Transition And Organic Metals Composition Catalysts For Addition Polymerization (AREA)
- Lubricants (AREA)
- Photoreceptors In Electrophotography (AREA)
- Reciprocating Pumps (AREA)
- Fertilizing (AREA)
Abstract
Description
Die Erfindung betrifft ein Verdrängerteil einer Kolbenpumpe für abrasive und/oder korrosive Flüssigkeiten, bestehend aus einer Kolbenstange und einem an dieser mittels einer lösbaren Verbindung befestigten Kolben aus einem oxidkeramischen Material, wobei der Kolben ein in Richtung des Kolbenbodens verlaufendes Sackloch aufweist.The invention relates to a displacement part of a piston pump for abrasive and / or corrosive liquids, consisting of a piston rod and a piston attached to it by means of a releasable connection made of an oxide-ceramic material, the piston having a blind hole running in the direction of the piston head.
Pumpenkolben von Hochdruckpumpen für Waschaggregate, wie sie beispielsweise in der Landwirtschaft zum Abspritzen von Ställen oder zum Reinigen von Maschinen, wie auch im Automobilsektor zum Autoreinigen eingesetzt werden, unterliegen hohen Beanspruchungen. Die Pumpen sind dabei im allgemeinen als Kolbenpumpen ausgeführt, bei denen 2-6 Zylinder auf einer Kurbelwelle arbeiten. Sie erreichen Drücke, die zwischen 80 und 180 bar. liegen. Als Reinigungsflüssigkeit werden meist scharfe Alkalien eingesetzt. Die Temperaturen der Reinigungsflüssigkeiten betragen 80 und mehr Grad C. Die bisher als Kolben eingesetzten beschichteten oder hartverchromten Stahlhülsen wurden über eine Spannschraube mit der Kolbenstange verbunden. Alternativ zu diesen Stahlhülsen hat man entsprechende Hülsen aus gesinterter Oxidkeramik eingesetzt, die analog verbunden waren. Als Metall für die Kolbenstange wurde ein nichtrostendes Material, also im allgemeinen ein hochlegierter Stahl verwandt.Pump pistons of high-pressure pumps for washing units, such as those used in agriculture for hosing down stables or cleaning machines, as well as in the automotive sector for car cleaning, are subject to high loads. The pumps are generally designed as piston pumps, in which 2-6 cylinders work on a crankshaft. They reach pressures between 80 and 180 bar. lie. Sharp alkalis are usually used as the cleaning liquid. The temperatures of the cleaning liquids are 80 and more degrees C. The coated or hard chrome-plated steel sleeves previously used as pistons were connected to the piston rod by means of a clamping screw. As an alternative to these steel sleeves, corresponding sleeves made of sintered oxide ceramic were used, which were connected in an analogous manner. A stainless material, i.e. generally a high-alloy steel, was used as the metal for the piston rod.
Mit dem Einsatz einer Keramikhülse als Kolben konnte bereits weitgehend die Anforderung an die Verschleißfestigkeit und chemische Beständigkeit des Kolbens sowie Lebensdauer der Manschette berücksichtigt werden. Schwierigkeiten ergaben sich jedoch durch die Befestigung dieser Keramikhülse auf der Kolbenstange. In vielen Fällen korrodierte die Schraube oder vertrug sich nicht mit dem Fördermedium, in das sie eintaucht. In allen Fällen war es erforderlich, eine Abdichtung gegenüber der Keramikhülse zu fertigen, die ausgesprochen aufwendig war. Nur durch einen O-Ring mit dahinter angeordnetem Führungsring und einer Kupferscheibe konnte gewährleistet werden, daß die Abdichtung über einen längeren Zeitraum Bestand hatte. Außerdem mußten beide Stirnseiten der Keramikhülse plangeschliffen werden, um ein Zerstören des Kolbens durch beim Verspannen auftretende Biegekräfte zu vermeiden.With the use of a ceramic sleeve as the piston, the requirements regarding the wear resistance and chemical resistance of the piston as well as the service life of the sleeve could be largely taken into account. Difficulties arose, however, from attaching this ceramic sleeve to the piston rod. In many cases, the screw corroded or was not compatible with the medium in which it was immersed. In all cases it was necessary to produce a seal against the ceramic sleeve, which was extremely complex. Only with an O-ring with a guide ring behind it and a copper washer could it be guaranteed that the seal would last for a long time. In addition, both end faces of the ceramic sleeve had to be ground flat in order to prevent the piston from being destroyed by bending forces that occur during tensioning.
Die Anordnung des O-Rings für die Dichtung erforderte zusätzlich das Einschleifen einer Fase im Eingriffsbereich des O-Ringes in das Keramikrohr, um die Gefahr des Zerquetschens des 0-Ringes bei der Montage zu verhindern. Das Zerquetschen ergab eine mangelhafte Dichtung, die zur Korrosion innerhalb des Kolbens führte oder im Saughub den Kolben durch höheren Innendruck zerstörte. Auch durch das Anbringen der Fase wurde die Gefahr, daß ein O-Ring bei schneller Montage zerquetscht wurde, nicht völlig verhindert. Da die Kolben nach einer gewissen Arbeitszeit gelöst werden müssen, um die verschlissenen Dichtmanschetten, die auf diesem Kolben gleiten, auszuwechseln, ist es absolut erforderlich, daß die Verbindung zwischen Kolben und Kolbenstange nicht korrodieren kann, d. h. vom Fördermedium völlig getrennt sein muß.The arrangement of the O-ring for the seal also required grinding a chamfer in the engagement area of the O-ring in the ceramic tube in order to prevent the risk of the O-ring being crushed during assembly. The crushing resulted in a defective seal, which led to corrosion inside the piston or to the piston being destroyed by higher internal pressure in the suction stroke. Even the attachment of the chamfer did not completely prevent the risk of an O-ring being crushed during quick assembly. Since the pistons have to be loosened after a certain working time in order to replace the worn sealing sleeves that slide on this piston, it is absolutely essential that the connection between the piston and the piston rod cannot corrode, i. H. must be completely separated from the medium.
Der Begriff oxidkeramische Materialien oder Oxidkeramik im Sinne der vorliegenden Erfindung ist die Kurzbezeichnung für Keramik der reinen Oxide, Oxidverbindungen und Oxidgemische, soweit sie nahezu Si02-frei sind, wobei dieser Begriff als Abgrenzung gegen die herkömmliche Silikatkeramik dient. Insbesondere sind unter diesem Begriff Sinterprodukte aus den Oxiden von Aluminium, Beryllium, Magnesium, Zirkonium und Thorium sowie dem Spinell, also MgO, A1203, zu verstehen. Der Begriff umfaßt ferner die Titanate und das Uranoxid sowie die Oxide der seltenen Erden und auch einige Schwermetaltoxide, wobei alle diese Materialien in hoher Reinheit verwendet werden. Der Begriff hohe Reinheit schließt jedoch nicht aus, daß bestimmte Prozentsätze mehrerer Oxide miteinander vermischt und dann gesintert werden.The term oxide ceramic materials or oxide ceramics in the sense of the present invention is the short name for ceramics of pure oxides, oxide compounds and oxide mixtures, insofar as they are almost free of SiO 2 , this term serving as a differentiation from conventional silicate ceramics. In particular, this term is to be understood as meaning sintered products made from the oxides of aluminum, beryllium, magnesium, zirconium and thorium as well as spinel, ie MgO, A1 2 0 3 . The term also includes the titanates and uranium oxide, rare earth oxides, and some heavy metal oxides, all of which are used in high purity. However, the term high purity does not exclude that certain percentages of several oxides are mixed together and then sintered.
Oxidkeramische Materialien, wie beispielsweise Aluminiumoxid, werden entsprechend dem Aluminiumoxidgehalt der Massen bei Temperaturen oberhalb 1 500 °C gesintert. Bei dieser Sinterung schrumpfen zunächst die als Grünkörper gefertigten Teile erheblich, d. h. im Bereich von 18 bis 23%. Diese Schrumpfung ist in Abhängigkeit von der Gestalt der zu sinternden Materialien nicht überall völlig gleichmäßig, insbesondere dann nicht, wenn unterschiedliche Wandstärken vorhanden sind. Aus diesem Grunde ist es äußerst schwierig, ein exakt passendes Gewinde für eine Maschinenschraube in einen Oxidsinterkörper direkt einzusintern. Man muß demnach so vorgehen, daß das erforderliche Gewinde nachträglich durch Einschleifen mit diamantbestückten Schleifkörpern eingebracht bzw. nachbearbeitet wird. Ein derart aufwendiges Verfahren ist jedoch für einen solchen einfachen Körper, wie ihn ein Pumpenkolben darstellt, aus Preisgründen nicht realisierbar. Der Stand der Technik sah daher vor, aus Keramik Rohre zu sintern, die an beiden Stirnseiten geschliffen wurden und mittels eines Bolzens auf die Kolbenstange aufgeschraubt werden konnten. Der Nachteil dieser Konstruktion besteht in der komplizierten Abdichtung, ohne die ein Lösen des Kolbens nicht möglich ist. Ferner war es erforderlich, beide Stirnflächen planzuschleifen.Oxide ceramic materials, such as aluminum oxide, are sintered according to the aluminum oxide content of the materials at temperatures above 1,500 ° C. During this sintering, the parts manufactured as green bodies initially shrink considerably. H. in the range of 18 to 23%. Depending on the shape of the materials to be sintered, this shrinkage is not completely uniform everywhere, especially not if there are different wall thicknesses. For this reason, it is extremely difficult to directly sinter a precisely fitting thread for a machine screw into an oxide sintered body. One must therefore proceed in such a way that the required thread is subsequently introduced or reworked by grinding in with diamond-tipped grinding wheels. However, such a complex method cannot be implemented for a simple body such as that represented by a pump piston for reasons of price. The prior art therefore envisaged sintering ceramic tubes, which were ground on both faces and could be screwed onto the piston rod by means of a bolt. The disadvantage of this construction is the complicated sealing, without which the piston cannot be released. It was also necessary to grind both end faces.
Aus der DE-A-2 939 284 ist ein Kolben aus gesinterter Oxidkeramik bekannt, dessen metallisches Anschlußelement mittels eines Grobgewindes in ein im Kolben vorhandenes Gewindesackloch unter zusätzlichem Einbringen von Kleber eingeschraubt wird, wobei nach der Aushärtung des Klebers das metallische Anschlußelement fertig bearbeitet werden muß.From DE-A-2 939 284, a piston made of sintered oxide ceramic is known, the metallic connecting element of which is screwed into a threaded blind hole in the piston by means of a coarse thread with the additional introduction of adhesive, the metallic connecting element after the adhesive has hardened ment must be finished.
Diese Verbindung, die sich zwar als sehr sicher erwiesen hat, ist recht arbeitsaufwendig, da die Bearbeitung des metallischen Anschlußteiles in zwei Stufen vorgenommen werden muß. Außerdem sind, da ein exaktes Einkitten aufgrund des Sinterverzuges der Oxidkeramik nicht möglich ist, für die Bearbeitung des aus dem Sackloch des Kolbens herausragenden Metallbereiches größere Bearbeitungszugaben zu machen.This connection, which has proven to be very secure, is quite labor-intensive, since the machining of the metallic connecting part has to be carried out in two stages. In addition, since an exact cementing is not possible due to the sintering distortion of the oxide ceramic, larger machining allowances have to be made for the machining of the metal region protruding from the blind hole of the piston.
Der Erfindung liegt daher die Aufgabe zugrunde, eine Verbindung zwischen Kolben und Kolbenstange zu finden, die auch beim Einsatz in korrosiven und abrasiven Medien nach langer Laufzeit lösbar ist und die Schleifarbeit bei der Kolbenherstellung zu reduzieren.The invention is therefore based on the object of finding a connection between the piston and the piston rod, which can be released after a long period of time even when used in corrosive and abrasive media, and to reduce the grinding work during piston production.
Die Aufgabe wird durch die Kombination folgender Merkmale gelöst :
- Das Sackloch wird von einer den Mantel des Kolbens durchdringenden Ausnehmung geschnitten, in diese Ausnehmung ist ein Gewindestück eingebracht, der Kolbenfuß wird von einem Adapter erfaßt, der mittels einer Schraubverbindung, die durch das Sackloch in das Gewindestück eingreift, an ihm befestigt und mit der Kolbenstange gekuppelt ist.
- The blind hole is cut by a recess penetrating the jacket of the piston, a threaded piece is introduced into this recess, the piston foot is gripped by an adapter which is fastened to it by means of a screw connection which engages through the blind hole in the threaded piece and to the piston rod is coupled.
Durch die Erfindung ergeben sich eine Vielzahl von Vorteilen. Zunächst wird die Zahl der nach dem Sintervorgang. des Kolbens zu bearbeitenden Flächen auf zwei reduziert, d. h. nur noch die Mantelfläche und die Stirnfläche des Kolbenfußes müssen bearbeitet werden. Das Sackloch sowie auch die Ausnehmung werden im Grünzustand in den Kolben eingebracht und bedürfen wie auch der Kolbenboden keiner Nachbearbeitung nach dem Sintervorgang. Die Toleranzen von Sackloch und Ausnehmung sind also relativ groß, weil die erforderliche Passung, also das Ausrichten des Kolbens erst am Adapter erfolgt. Eine bevorzugte Ausgestaltung der Erfindung sieht vor, daß der Adapter den Kolbenfuß zentrierend umfaßt. Es handelt sich also um eine Außenzentrierung des Kolbens, bei dem für die Gewindeelemente genügend Spiel bleibt, ohne daß dadurch die Genauigkeit der Zentrierung verloren geht.The invention has a number of advantages. First the number after the sintering process. the area of the piston to be machined reduced to two, d. H. only the outer surface and the end face of the piston foot have to be machined. The blind hole and the recess are made in the piston in the green state and, like the piston crown, do not require any reworking after the sintering process. The tolerances of the blind hole and the recess are therefore relatively large, because the required fit, that is to say the alignment of the piston, only takes place on the adapter. A preferred embodiment of the invention provides for the adapter to center the piston foot. It is therefore an external centering of the piston, in which there is enough play for the threaded elements without losing the accuracy of the centering.
Zweckmäßig ist dabei der Adapter mit einem Gewindezapfen versehen, der durch das Sackloch in das Gewindestück eingeschraubt ist. Das Gewindestück selbst besteht zweckmäßig aus einem einfachen Stück Rundstahl, das senkrecht zu seiner Längsausdehnung durchbohrt und mit Gewinde versehen ist. Statt eines Rundstahles kann auch jeder beliebige Profilstahl eingesetzt werden, der analog eine Gewindebohrung aufweist. Von Bedeutung ist lediglich, daß der Gewindezapfen des Adapters im Sackloch genügend Spiel hat und daß das Gewindestück in der Ausnehmung genügend Spiel hat, um eine Befestigung zu ermöglichen.The adapter is expediently provided with a threaded pin which is screwed through the blind hole into the threaded piece. The threaded piece itself expediently consists of a simple piece of round steel which is drilled perpendicularly to its longitudinal extent and is threaded. Instead of a round steel, any profile steel can be used that has a threaded hole. It is only important that the threaded pin of the adapter has enough play in the blind hole and that the threaded piece in the recess has enough play to allow attachment.
Selbstverständlich ist es auch möglich, statt eines Gewindezapfens, der fest mit dem Adapter verbunden ist, den Adapter mit einer Bohrung auszuführen und durch diese eine Maschinenschraube in das Gewindestück einzudrehen. In jedem Fall ist der Adapter jedoch mit der Kolbenstange zu verbinden, was zweckmäßig durch Auf-oder Einstecken der Kolbenstange auf bzw. in den Adapter erfolgt ; jedoch ist es auch möglich, diese Verbindung als Schraubverbindung vorzusehen.Of course, it is also possible, instead of a threaded pin, which is firmly connected to the adapter, to design the adapter with a bore and to screw a machine screw into the threaded part through this. In any case, however, the adapter is to be connected to the piston rod, which is expediently carried out by plugging the piston rod onto or into the adapter; however, it is also possible to provide this connection as a screw connection.
Die Erfindung wird nachstehend anhand der Zeichnungen beschrieben.
- Die Figur 1 zeigt einen Kolben, der über einen Adapter mit Gewindezapfen mit der Kolbenstange verbunden ist,
- die Figur 2 einen mittels einer Maschinenschraube am Adapter befestigten Kolben.
- FIG. 1 shows a piston which is connected to the piston rod via an adapter with a threaded pin,
- 2 shows a piston attached to the adapter by means of a machine screw.
Der Kolben 2 aus gesinterter Oxidkeramik weist im Bereich des Kolbenbodens 3 eine Fase 17 auf, an die sich der Mantel 6 des Kolbens 2 anschließt. Vom Kolbenfuß 4 erstreckt sich ein Sackloch 5 in Richtung des Kolbenbodens 3, das im Grünzustand des Kolbens 2 eingebracht wurde, ohne daß sich nach dem Sinterverfahren eine Bearbeitungsstufe anschloß. Dieses Sackloch 5 wird senkrecht von der Ausnehmung 7 geschnitten, die ebenfalls durch einen Bohrvorgang im Grünzustand des Kolbens 2 eingebracht wurde.The piston 2 made of sintered oxide ceramic has a
In dieser Ausnehmung 7 liegt das Gewindestück 8, ein beidseitig angefastes Stück Rundstahl, das mittig mit einer Gewindebohrung 18 versehen wurde.In this recess 7 is the threaded
Der Gewindezapfen 10, der Teil des Adapters 9 ist, ist in die Gewindebohrung 18 des Gewindestückes 8 eingedreht und verbindet dadurch den Kolben 2 mit dem Adapter 9. Der Adapter 9 seinerseits ist auf der dem Gewindezapfen 10 gegenüberliegenden Seite mit einem Gewindeansatz 11 versehen, auf den die Kolbenstange 1 aufgeschraubt wird. Eine alternative Lösung ist in der Fig. 2 dargestellt, wo statt des Gewindezapfens 10 eine Maschinenschraube 12 eingesetzt wird, die die Bohrung 13 im Adapter 9 durchdringt und in das Gewindestück 8 eingreift. An die Bohrung 13 schließt sich eine Aussenkung 14 an, die den Kopf der Maschinenschraube 12 aufnimmt. Der Adapter 9 ist mit einem Ansatz 16 versehen, auf den die als Rohr ausgeführte Kolbenstange 1 aufgeschoben und mittels eines Kerbstiftes 15 befestigt ist.The threaded
Claims (3)
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| AT83110319T ATE18790T1 (en) | 1982-10-19 | 1983-10-15 | DISPLACEMENT SECTION OF A PISTON PUMP. |
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE3238667 | 1982-10-19 | ||
| DE19823238667 DE3238667A1 (en) | 1982-10-19 | 1982-10-19 | DISPLACEMENT PART OF A PISTON PUMP |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| EP0108944A1 EP0108944A1 (en) | 1984-05-23 |
| EP0108944B1 true EP0108944B1 (en) | 1986-03-26 |
Family
ID=6176063
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| EP83110319A Expired EP0108944B1 (en) | 1982-10-19 | 1983-10-15 | Positive displacement member of a piston pump |
Country Status (5)
| Country | Link |
|---|---|
| EP (1) | EP0108944B1 (en) |
| AT (1) | ATE18790T1 (en) |
| DE (2) | DE3238667A1 (en) |
| DK (1) | DK452983A (en) |
| FI (1) | FI73793C (en) |
Families Citing this family (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4741254A (en) * | 1986-06-12 | 1988-05-03 | Taylor Julian S | Pump plunger |
| DE3702446A1 (en) * | 1987-01-28 | 1988-08-11 | Kaercher Gmbh & Co Alfred | HIGH PRESSURE CLEANING DEVICE WITH A SWASHPLATE PISTON PUMP |
| DE3914333A1 (en) * | 1989-04-29 | 1990-10-31 | Hoechst Ceram Tec Ag | PUMP PISTON FOR AXIAL PISTON PUMPS |
| DE102012219348A1 (en) * | 2012-10-23 | 2014-04-24 | Robert Bosch Gmbh | Pump element for a hydraulic unit with a pump piston |
| IT201800004176A1 (en) | 2018-04-03 | 2019-10-03 | PISTON IN CERAMIC MATERIAL | |
| IT201900006680A1 (en) * | 2019-05-09 | 2020-11-09 | Annovi Reverberi Spa | PISTON IN CERAMIC MATERIAL |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US1195546A (en) * | 1916-08-22 | Pump-piston | ||
| DE2939284C2 (en) * | 1979-09-28 | 1982-08-26 | Feldmühle AG, 4000 Düsseldorf | Process for manufacturing pistons from sintered oxide ceramic |
-
1982
- 1982-10-19 DE DE19823238667 patent/DE3238667A1/en not_active Withdrawn
-
1983
- 1983-09-30 DK DK452983A patent/DK452983A/en not_active Application Discontinuation
- 1983-10-14 FI FI833740A patent/FI73793C/en not_active IP Right Cessation
- 1983-10-15 EP EP83110319A patent/EP0108944B1/en not_active Expired
- 1983-10-15 AT AT83110319T patent/ATE18790T1/en active
- 1983-10-15 DE DE8383110319T patent/DE3362709D1/en not_active Expired
Also Published As
| Publication number | Publication date |
|---|---|
| DE3238667A1 (en) | 1984-04-26 |
| FI833740A0 (en) | 1983-10-14 |
| FI833740A (en) | 1984-04-20 |
| DE3362709D1 (en) | 1986-04-30 |
| FI73793C (en) | 1987-11-09 |
| EP0108944A1 (en) | 1984-05-23 |
| DK452983D0 (en) | 1983-09-30 |
| ATE18790T1 (en) | 1986-04-15 |
| DK452983A (en) | 1984-04-20 |
| FI73793B (en) | 1987-07-31 |
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