EP1253322A2 - Hydraulic machine - Google Patents
Hydraulic machine Download PDFInfo
- Publication number
- EP1253322A2 EP1253322A2 EP02009463A EP02009463A EP1253322A2 EP 1253322 A2 EP1253322 A2 EP 1253322A2 EP 02009463 A EP02009463 A EP 02009463A EP 02009463 A EP02009463 A EP 02009463A EP 1253322 A2 EP1253322 A2 EP 1253322A2
- Authority
- EP
- European Patent Office
- Prior art keywords
- shaft
- hydraulic
- housing
- pump
- valve block
- 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
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Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04C—ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT PUMPS
- F04C15/00—Component parts, details or accessories of machines, pumps or pumping installations, not provided for in groups F04C2/00 - F04C14/00
- F04C15/0057—Driving elements, brakes, couplings, transmission specially adapted for machines or pumps
- F04C15/0061—Means for transmitting movement from the prime mover to driven parts of the pump, e.g. clutches, couplings, transmissions
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04C—ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT PUMPS
- F04C15/00—Component parts, details or accessories of machines, pumps or pumping installations, not provided for in groups F04C2/00 - F04C14/00
- F04C15/0003—Sealing arrangements in rotary-piston machines or pumps
- F04C15/0034—Sealing arrangements in rotary-piston machines or pumps for other than the working fluid, i.e. the sealing arrangements are not between working chambers of the machine
- F04C15/0038—Shaft sealings specially adapted for rotary-piston machines or pumps
Definitions
- the invention is based on a hydraulic machine, especially for the promotion of hydraulic oil, lubricating oil or the like, according to the preamble of claim 1 defined in more detail.
- Such a hydraulic working machine is from practice is known and is for example as a drive unit Hydraulic system trained.
- the hydraulic working machine can be part of a se known hydraulic unit, which is essentially a hydraulic pump, a hydraulic oil reservoir, a Valve block and one designed as an electric motor Includes drive unit for the hydraulic pump.
- the hydraulic pump which is attached to the valve block and in one Pump housing is arranged, immersed in the hydraulic oil reservoir and is also on the valve block attached drive unit in operative connection, that an output shaft of the drive unit with a drive shaft the hydraulic pump is coupled.
- the coupling takes place in the area of a coupling chamber and sealed from the storage container by means of an O-ring Breakthrough of the valve block.
- the fitting is formed on the pump housing and engages in a recess in the valve block.
- a fit on the pump housing is a cost-intensive measure.
- a commutator motor is known from DE 44 23 531 A1, which has a brush support plate which on a Drive housing of a hydraulic pump is flanged.
- the Brush support plate is penetrated by a rotor shaft, which protrudes into the drive housing.
- the rotor shaft is mounted in a roller bearing.
- the roller bearing on the one hand engages in a centering recess in the brush support plate and on the other hand in a bearing recess of the Drive housing.
- the hydraulic working machine according to the invention with the Features according to the preamble of claim 1, which the shaft seal serves as a centering device has the advantage that on a trained on the machine housing A fit can be dispensed with, because the machine housing is opposite the Centering unit so that the shaft and a second shaft coupled with the shaft are aligned.
- the hydraulic working machine according to the invention can in an advantageous embodiment, for example a pump unit represent in which a trained as a gear pump Hydraulic pump on a serving as a support unit Valve block is attached and by means of a corresponding one Unit forming electric motor can be driven is.
- the electric motor has an output shaft in the usual way, the one with a drive shaft of the hydraulic pump is coupled.
- the hydraulic working machine can also be a hydraulic motor, like a gear motor, act.
- the shaft then forms the output shaft of the motor.
- the hydraulic Working machine serves the shaft sealing ring such as a centering device that he on the one hand in the machine housing and on the other hand in the breakthrough of the Carrier assembly immersed.
- first area of the shaft seal in the radial Direction from the machine housing for example one the pump cover assigned to the machine housing, and a second area of the shaft seal from the carrier assembly limited, which can be a valve block.
- the carrier assembly can also be of a housing, for example a drive unit, such as an electric motor, for a hydraulic pump may be formed.
- a drive unit such as an electric motor
- a hydraulic pump for a hydraulic pump
- the shaft sealing ring as a seal between the pump housing and the valve block.
- the sealing effect is there especially ensured if the shaft seal is a Has rubber sheathing.
- an O-ring be arranged. If the shaft seal is a rubber jacket the O-ring can be omitted if necessary.
- the only figure shows a hydraulic pump on one Valve block is attached.
- the embodiment shown in the figure shows one hydraulic work machine 1, the one as a carrier assembly serving valve block 2 and a hydraulic pump 3 includes.
- the hydraulic pump 3 is attached to the valve block 2 and dips into a pressure medium reservoir, not shown here one, which via connecting means 4 is also attached to the valve block 2.
- the hydraulic pump 3 is designed as a gear pump and has one consisting of the housing parts 5, 6 and 7 Machine housing, i.e. Pump housing, on the housing part 7 is designed as a pump cover and on the valve block 2 adjoins.
- the hydraulic pump 3 designed as a gear pump is about a drive shaft 8 which drives the housing cover 7 reaches through and with a coupling area 9 in a Coupling space formed breakthrough 10 of the valve block 2 dips.
- the coupling area 9 is used for coupling an electric motor, not shown here, which means in holes 11 engaging screws on the valve block 2 is attachable.
- the electric motor usually has an output shaft on the coupling area 9 with the drive shaft 8 of the hydraulic pump 3 can be coupled.
- a ring-shaped enclosing the drive shaft 8 Recess 12 formed at the bottom of the Centering disk 13 enclosing drive shaft 8 for guidance the drive shaft 8 is arranged.
- a shaft sealing ring is immersed in the recess 12 14 a, the one facing away from the hydraulic pump 3 Immersed in the opening 10 of the valve block 2 at the end and so for centering the hydraulic pump 3 relative to the Valve block 2 and thus compared to that not shown here Serves electric motor.
Abstract
Description
Die Erfindung geht von einer hydraulischen Arbeitsmaschine, insbesondere zur Förderung von Hydrauliköl, Schmieröl oder dergleichen, gemäß der im Oberbegriff des Patentanspruches 1 näher definierten Art aus.The invention is based on a hydraulic machine, especially for the promotion of hydraulic oil, lubricating oil or the like, according to the preamble of claim 1 defined in more detail.
Eine solche hydraulische Arbeitsmaschine ist aus der Praxis bekannt und ist beispielsweise als Antriebseinheit eines Hydrauliksystems ausgebildet.Such a hydraulic working machine is from practice is known and is for example as a drive unit Hydraulic system trained.
Die hydraulische Arbeitsmaschine kann Bestandteil eines per se bekannten Hydraulikaggregats sein, das im wesentlichen eine Hydraulikpumpe, einen Hydraulikölvorratsbehälter, einen Ventilblock sowie eine als Elektromotor ausgebildete Antriebseinheit für die Hydraulikpumpe umfaßt. Die Hydraulikpumpe, die an dem Ventilblock befestigt ist und in einem Pumpegehäuse angeordnet ist, taucht in den Hydraulikölvorratsbehälter ein und steht mit der ebenfalls an dem Ventilblock befestigten Antriebseinheit derart in Wirkverbindung, daß eine Abtriebswelle der Antriebseinheit mit einer Antriebswelle der Hydraulikpumpe gekuppelt ist. Die Kupplung erfolgt im Bereich eines als Kupplungsraum ausgebildeten und gegenüber dem Vorratsbehälter mittels eines O-Rings abgedichteten Durchbruches des Ventilblocks. Damit die Kupplung zwischen der Antriebswelle der Hydraulikpumpe und der Abtriebswelle der Antriebseinheit nicht verschleißt und geräuscharm arbeitet und damit keine radialen Kräfte auf die Antriebswelle ausgeübt werden, ist es erforderlich, daß die beiden Wellen, von denen zumindest die Antriebswelle der Hydraulikpumpe einen Wellendichtring durchgreift, miteinander fluchten.The hydraulic working machine can be part of a se known hydraulic unit, which is essentially a hydraulic pump, a hydraulic oil reservoir, a Valve block and one designed as an electric motor Includes drive unit for the hydraulic pump. The hydraulic pump, which is attached to the valve block and in one Pump housing is arranged, immersed in the hydraulic oil reservoir and is also on the valve block attached drive unit in operative connection, that an output shaft of the drive unit with a drive shaft the hydraulic pump is coupled. The coupling takes place in the area of a coupling chamber and sealed from the storage container by means of an O-ring Breakthrough of the valve block. So that the clutch between the drive shaft of the hydraulic pump and the The output shaft of the drive unit is not worn out and is quiet works and therefore no radial forces on the Drive shaft are exercised, it is necessary that the two shafts, of which at least the drive shaft of the Hydraulic pump passes through a shaft seal, together aligned.
Dies wird dadurch gewährleistet, daß die Hydraulikpumpe über einen sogenannten Einpaß in den Ventilblock eingesetzt ist. Der Einpaß ist an dem Pumpengehäuse ausgebildet und greift in eine Ausnehmung des Ventilblocks ein. Ein Einpaß an dem Pumpengehäuse ist eine kostenintensive Maßnahme.This is ensured by the hydraulic pump inserted into the valve block via a so-called fitting is. The fitting is formed on the pump housing and engages in a recess in the valve block. A fit on the pump housing is a cost-intensive measure.
Ferner ist aus der DE 44 23 531 A1 ein Kommutatormotor bekannt, der eine Bürstentragplatte aufweist, die an einem Antriebsgehäuse einer Hydraulikpumpe angeflanscht ist. Die Bürstentragplatte ist von einer Rotorwelle durchgriffen, welche in das Antriebsgehäuse hineinragt. In dem Bereich, in dem die Bürstentragplatte an das Antriebsgehäuse grenzt, ist die Rotorwelle in einem Wälzlager gelagert. Das Wälzlager greift einerseits in eine Zentrierausnehmung der Bürstentragplatte und andererseits in eine Lagerausnehmung des Antriebsgehäuses ein.Furthermore, a commutator motor is known from DE 44 23 531 A1, which has a brush support plate which on a Drive housing of a hydraulic pump is flanged. The Brush support plate is penetrated by a rotor shaft, which protrudes into the drive housing. In that area, in which the brush support plate borders on the drive housing, the rotor shaft is mounted in a roller bearing. The roller bearing on the one hand engages in a centering recess in the brush support plate and on the other hand in a bearing recess of the Drive housing.
Die hydraulische Arbeitsmaschine nach der Erfindung mit den Merkmalen nach dem Oberbegriff des Patentanspruches 1, bei welcher der Wellendichtring als Zentriereinrichtung dient, hat den Vorteil, daß auf einen an dem Maschinengehäuse ausgebildeten Einpaß verzichtet werden kann, denn das Maschinengehäuse ist mittels des Wellendichtrings gegenüber der Trägerbaueinheit derart zentrierbar, daß die Welle und eine mit der Welle gekuppelte zweite Welle miteinander fluchten.The hydraulic working machine according to the invention with the Features according to the preamble of claim 1, which the shaft seal serves as a centering device has the advantage that on a trained on the machine housing A fit can be dispensed with, because the machine housing is opposite the Centering unit so that the shaft and a second shaft coupled with the shaft are aligned.
Damit ergibt sich vorteilhafterweise eine Zentrierung, welche kostengünstig realisiert werden kann.This advantageously results in a centering, which can be realized inexpensively.
Die hydraulische Arbeitsmaschine nach der Erfindung kann in einer vorteilhaften Ausführung beispielsweise ein Pumpenaggregat darstellen, bei welchem eine als Zahnradpumpe ausgebildete Hydraulikpumpe an einem als Trägerbaueinheit dienenden Ventilblock befestigt ist und mittels eines die korrespondierende Baueinheit bildenden Elektromotors antreibbar ist. Der Elektromotor hat in üblicher Weise eine Abtriebswelle, die mit einer Antriebswelle der Hydraulikpumpe gekuppelt ist.The hydraulic working machine according to the invention can in an advantageous embodiment, for example a pump unit represent in which a trained as a gear pump Hydraulic pump on a serving as a support unit Valve block is attached and by means of a corresponding one Unit forming electric motor can be driven is. The electric motor has an output shaft in the usual way, the one with a drive shaft of the hydraulic pump is coupled.
Damit bei einem derartigen Pumpenaggregat im Sinne der Erfindung gewährleistet ist, daß die beiden Wellen exakt miteinander fluchten, ist die Hydraulikpumpe mittels eines Wellendichtrings gegenüber dem Ventilblock zentriert, durch den die geführt sind.So with such a pump unit in the sense of the invention it is guaranteed that the two shafts are exactly with each other the hydraulic pump is aligned using a Shaft sealing rings centered opposite the valve block who are led.
Bei der hydraulischen Arbeitsmaschine nach der Erfindung kann es sich auch um einen Hydraulikmotor, wie einen Zahnradmotor, handeln. Die Welle bildet dann die Abtriebswelle des Motors.In the hydraulic working machine according to the invention can also be a hydraulic motor, like a gear motor, act. The shaft then forms the output shaft of the motor.
Nach einer bevorzugten Ausführungsform der hydraulischen Arbeitsmaschine nach der Erfindung dient der Wellendichtring derart als Zentriereinrichtung, daß er einerseits in das Maschinengehäuse und andererseits in den Durchbruch der Trägerbaueinheit eintaucht.According to a preferred embodiment of the hydraulic Working machine according to the invention serves the shaft sealing ring such as a centering device that he on the one hand in the machine housing and on the other hand in the breakthrough of the Carrier assembly immersed.
Bei dieser konstruktiv einfach herzustellenden Ausführungsform ist ein erster Bereich des Wellendichtrings in radialer Richtung von dem Maschinengehäuse, beispielsweise einem dem Maschinengehäuse zugeordneten Pumpendeckel, und ein zweiter Bereich des Wellendichtrings von der Trägerbaueinheit begrenzt, die ein Ventilblock sein kann.In this structurally easy to manufacture embodiment is a first area of the shaft seal in the radial Direction from the machine housing, for example one the pump cover assigned to the machine housing, and a second area of the shaft seal from the carrier assembly limited, which can be a valve block.
Die Trägerbaueinheit kann beispielsweise auch von einem Gehäuse einer Antriebseinheit, wie einem Elektromotor, für eine Hydraulikpumpe gebildet sein. In diesem Falle taucht der Wellendichtring einerseits in das Gehäuse der Hydraulikpumpe und andererseits in das Gehäuse der Antriebseinheit ein und dient so der Zentrierung der Hydraulikpumpe gegenüber der Antriebseinheit.The carrier assembly can also be of a housing, for example a drive unit, such as an electric motor, for a hydraulic pump may be formed. In this case, diving the shaft seal on the one hand in the housing of the hydraulic pump and on the other hand in the housing of the drive unit and thus serves to center the hydraulic pump opposite the drive unit.
In einer bevorzugten Ausführung der Erfindung kann der Wellendichtring als Dichtung zwischen dem Pumpengehäuse und dem Ventilblock vorgesehen sein. Die Dichtwirkung ist dabei insbesondere gewährleistet, wenn der Wellendichtring eine Gummiummantelung aufweist.In a preferred embodiment of the invention, the shaft sealing ring as a seal between the pump housing and the valve block. The sealing effect is there especially ensured if the shaft seal is a Has rubber sheathing.
Alternativ oder zusätzlich kann zur Dichtung des Durchbruches gegenüber der Umgebung des Maschinengehäuses zwischen dem Maschinengehäuse und der Trägerbaueinheit ein O-Ring angeordnet sein. Sofern der Wellendichtring eine Gummiummantelung aufweist, kann der O-Ring gegebenenfalls entfallen.Alternatively or additionally, it can be used to seal the opening compared to the environment of the machine housing between the machine housing and the support assembly an O-ring be arranged. If the shaft seal is a rubber jacket the O-ring can be omitted if necessary.
Im Fall eines hydraulischen Pumpenaggregats der oben beschriebenen Art dichtet der O-Ring bzw. der Wellendichtring den als Kupplungsraum ausgebildeten Durchbruch, in dem die Abtriebswelle der Antriebseinheit und die Antriebswelle der Hydraulikpumpe miteinander gekuppelt sind, gegenüber dem Hydraulikölvorratsbehälter.In the case of a hydraulic pump unit, the one described above Art seals the O-ring or the shaft seal the breakthrough designed as a coupling space, in which the Output shaft of the drive unit and the drive shaft of the Hydraulic pump are coupled to each other Hydraulic oil reservoir.
Weitere Vorteile und vorteilhafte Ausgestaltungen des Gegenstandes nach der Erfindung sind der Beschreibung, der Zeichnung und den Patentansprüchen entnehmbar.Further advantages and advantageous configurations of the object according to the invention are the description of Drawing and the claims can be found.
Ein Ausführungsbeispiel der hydraulischen Arbeitsmaschine nach der Erfindung ist in der Zeichnung schematisch vereinfacht dargestellt und wird in der nachfolgenden Beschreibung näher erläutert. An embodiment of the hydraulic working machine according to the invention is schematically simplified in the drawing shown and is in the description below explained in more detail.
Die einzige Figur zeigt eine Hydraulikpumpe, die an einem Ventilblock befestigt ist.The only figure shows a hydraulic pump on one Valve block is attached.
Das in der Figur dargestellte Ausführungsbeispiel zeigt eine
hydraulische Arbeitsmaschine 1, die einen als Trägerbaueinheit
dienenden Ventilblock 2 sowie eine Hydraulikpumpe 3
umfaßt. Die Hydraulikpumpe 3 ist an dem Ventilblock 2 befestigt
und taucht in einen hier nicht dargestellten Druckmittelvorratsbehälter
ein, welcher über Verbindungsmittel 4
ebenfalls an dem Ventilblock 2 befestigt ist.The embodiment shown in the figure shows one
hydraulic work machine 1, the one as a carrier assembly
serving
Die Hydraulikpumpe 3 ist vorliegend als Zahnradpumpe ausgebildet
und weist ein aus den Gehäuseteilen 5, 6 und 7 bestehendes
Maschinengehäuse, d.h. Pumpengehäuse, auf, wobei
das Gehäuseteil 7 als Pumpendeckel ausgebildet ist und an
den Ventilblock 2 angrenzt.In the present case, the
Die als Zahnradpumpe ausgebildete Hydraulikpumpe 3 ist über
eine Antriebswelle 8 antreibbar, welche den Gehäusedeckel 7
durchgreift und mit einem Kupplungsbereich 9 in einen als
Kupplungsraum ausgebildeten Durchbruch 10 des Ventilblocks
2 eintaucht. Der Kupplungsbereich 9 dient zur Kupplung mit
einem hier nicht näher dargestellten Elektromotor, der mittels
in Bohrungen 11 eingreifender Schrauben an dem Ventilblock
2 befestigbar ist. The
Der Elektromotor weist üblicherweise eine Abtriebswelle
auf, die über den Kupplungsbereich 9 mit der Antriebswelle
8 der Hydraulikpumpe 3 kuppelbar ist.The electric motor usually has an output shaft
on the
An der dem Ventilblock 2 zugewandten Seite ist an dem Pumpendeckel
7 eine die Antriebswelle 8 umschließende, ringförmige
Ausnehmung 12 ausgebildet, an deren Boden eine die
Antriebswelle 8 umschließende Zentrierscheibe 13 zur Führung
der Antriebswelle 8 angeordnet ist.On the side facing the
Des weiteren taucht in die Ausnehmung 12 ein Wellendichtring
14 ein, der mit seinem der Hydraulikpumpe 3 abgewandten
Ende in den Durchbruch 10 des Ventilblocks 2 eintaucht
und so zur Zentrierung der Hydraulikpumpe 3 gegenüber dem
Ventilblock 2 und damit gegenüber dem hier nicht dargestellten
Elektromotor dient.Furthermore, a shaft sealing ring is immersed in the
Dadurch, daß der Wellendichtring radial einerseits an den
Pumpendeckel 7, der dem Pumpengehäuse zugeordnet ist, und
andererseits radial an den Ventilblock 2 grenzt, ist sichergestellt,
daß die Antriebswelle 8 der Hydraulikpumpe 3
und die Abtriebswelle des Elektromotors miteinander fluchten,
so daß ein geringer Verschleiß des Kupplungsbereichs
gewährleistet ist und im Betrieb der hydraulischen Arbeitsmaschine
1 keine radialen Kräfte auf die Antriebswelle 8
ausgeübt werden.The fact that the shaft sealing ring radially on the one hand on the
Zur Dichtung des Kupplungsraums 10 gegenüber dem Volumen
des nicht dargestellten Druckmittelvorratsbehälters ist
zwischen dem Pumpendeckel 7 und dem Ventilblock 2 ein
O-Ring 15 angeordnet. Auf diesen kann gegebenenfalls verzichtet
werden, wenn ein Wellendichtring 14 mit Gummiummantelung
eingesetzt wird, da dann der Wellendichtring 14 diese
Dichtfunktion übernimmt.To seal the
Es versteht sich, daß die Erfindung nicht auf das dargestellte Ausführungsbeispiel beschränkt ist. Vielmehr kann die Erfindung beispielsweise auch auf einen Zahnradmotor mit einer Abtriebswelle übertragen werden, die eine Trägerbaueinheit durchgreift und die mit einer korrespondierenden Welle einer anzutreibenden Baueinheit möglichst exakt fluchten muß.It is understood that the invention is not illustrated Embodiment is limited. Rather can the invention, for example, on a gear motor are transmitted with an output shaft, which is a carrier assembly engages and that with a corresponding one Shaft of a component to be driven as precisely as possible must swear.
Claims (4)
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE2001120711 DE10120711A1 (en) | 2001-04-27 | 2001-04-27 | Hydraulic work machine |
| DE10120711 | 2001-04-27 |
Publications (3)
| Publication Number | Publication Date |
|---|---|
| EP1253322A2 true EP1253322A2 (en) | 2002-10-30 |
| EP1253322A3 EP1253322A3 (en) | 2004-03-03 |
| EP1253322B1 EP1253322B1 (en) | 2005-10-05 |
Family
ID=7682960
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| EP20020009463 Expired - Lifetime EP1253322B1 (en) | 2001-04-27 | 2002-04-25 | Hydraulic machine |
Country Status (2)
| Country | Link |
|---|---|
| EP (1) | EP1253322B1 (en) |
| DE (2) | DE10120711A1 (en) |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US2883213A (en) * | 1956-05-15 | 1959-04-21 | Rolf H W Kroekel | Pump |
| DE2944263A1 (en) * | 1979-11-02 | 1981-05-27 | Robert Bosch Gmbh, 7000 Stuttgart | Gear pump or motor - has drive shaft passing through bush in cover bore, bush acting as centralised mounting to external component |
| DE8006057U1 (en) * | 1980-03-06 | 1981-09-17 | Robert Bosch Gmbh, 7000 Stuttgart | GEAR MACHINE (PUMP OR HYDROMOTOR) |
| DE3035663A1 (en) * | 1980-09-20 | 1982-05-13 | Robert Bosch Gmbh, 7000 Stuttgart | GEAR MACHINE (PUMP OR MOTOR) |
-
2001
- 2001-04-27 DE DE2001120711 patent/DE10120711A1/en not_active Withdrawn
-
2002
- 2002-04-25 DE DE50204431T patent/DE50204431D1/en not_active Expired - Fee Related
- 2002-04-25 EP EP20020009463 patent/EP1253322B1/en not_active Expired - Lifetime
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US2883213A (en) * | 1956-05-15 | 1959-04-21 | Rolf H W Kroekel | Pump |
| DE2944263A1 (en) * | 1979-11-02 | 1981-05-27 | Robert Bosch Gmbh, 7000 Stuttgart | Gear pump or motor - has drive shaft passing through bush in cover bore, bush acting as centralised mounting to external component |
| DE8006057U1 (en) * | 1980-03-06 | 1981-09-17 | Robert Bosch Gmbh, 7000 Stuttgart | GEAR MACHINE (PUMP OR HYDROMOTOR) |
| DE3035663A1 (en) * | 1980-09-20 | 1982-05-13 | Robert Bosch Gmbh, 7000 Stuttgart | GEAR MACHINE (PUMP OR MOTOR) |
Also Published As
| Publication number | Publication date |
|---|---|
| EP1253322A3 (en) | 2004-03-03 |
| EP1253322B1 (en) | 2005-10-05 |
| DE10120711A1 (en) | 2002-10-31 |
| DE50204431D1 (en) | 2006-02-16 |
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