EP1039144A2 - Hydraulische Steuereinrichtung - Google Patents
Hydraulische Steuereinrichtung Download PDFInfo
- Publication number
- EP1039144A2 EP1039144A2 EP99124451A EP99124451A EP1039144A2 EP 1039144 A2 EP1039144 A2 EP 1039144A2 EP 99124451 A EP99124451 A EP 99124451A EP 99124451 A EP99124451 A EP 99124451A EP 1039144 A2 EP1039144 A2 EP 1039144A2
- Authority
- EP
- European Patent Office
- Prior art keywords
- spring
- spool
- control
- slide
- supply circuit
- 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
Links
Images
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
- F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
- F15B11/00—Servomotor systems without provision for follow-up action; Circuits therefor
- F15B11/16—Servomotor systems without provision for follow-up action; Circuits therefor with two or more servomotors
- F15B11/161—Servomotor systems without provision for follow-up action; Circuits therefor with two or more servomotors with sensing of servomotor demand or load
- F15B11/162—Servomotor systems without provision for follow-up action; Circuits therefor with two or more servomotors with sensing of servomotor demand or load for giving priority to particular servomotors or users
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
- F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
- F15B13/00—Details of servomotor systems ; Valves for servomotor systems
- F15B13/02—Fluid distribution or supply devices characterised by their adaptation to the control of servomotors
- F15B13/022—Flow-dividers; Priority valves
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
- F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
- F15B2211/00—Circuits for servomotor systems
- F15B2211/40—Flow control
- F15B2211/405—Flow control characterised by the type of flow control means or valve
- F15B2211/40515—Flow control characterised by the type of flow control means or valve with variable throttles or orifices
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
- F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
- F15B2211/00—Circuits for servomotor systems
- F15B2211/40—Flow control
- F15B2211/405—Flow control characterised by the type of flow control means or valve
- F15B2211/40553—Flow control characterised by the type of flow control means or valve with pressure compensating valves
- F15B2211/40561—Flow control characterised by the type of flow control means or valve with pressure compensating valves the pressure compensating valve arranged upstream of the flow control means
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
- F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
- F15B2211/00—Circuits for servomotor systems
- F15B2211/40—Flow control
- F15B2211/42—Flow control characterised by the type of actuation
- F15B2211/428—Flow control characterised by the type of actuation actuated by fluid pressure
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
- F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
- F15B2211/00—Circuits for servomotor systems
- F15B2211/40—Flow control
- F15B2211/45—Control of bleed-off flow, e.g. control of bypass flow to the return line
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
- F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
- F15B2211/00—Circuits for servomotor systems
- F15B2211/40—Flow control
- F15B2211/455—Control of flow in the feed line, i.e. meter-in control
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
- F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
- F15B2211/00—Circuits for servomotor systems
- F15B2211/50—Pressure control
- F15B2211/505—Pressure control characterised by the type of pressure control means
- F15B2211/50563—Pressure control characterised by the type of pressure control means the pressure control means controlling a differential pressure
- F15B2211/50572—Pressure control characterised by the type of pressure control means the pressure control means controlling a differential pressure using a pressure compensating valve for controlling the pressure difference across a flow control valve
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
- F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
- F15B2211/00—Circuits for servomotor systems
- F15B2211/50—Pressure control
- F15B2211/57—Control of a differential pressure
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
- F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
- F15B2211/00—Circuits for servomotor systems
- F15B2211/70—Output members, e.g. hydraulic motors or cylinders or control therefor
- F15B2211/78—Control of multiple output members
- F15B2211/781—Control of multiple output members one or more output members having priority
Definitions
- the invention is based on a hydraulic control device according to the preamble of claim 1.
- a valve arrangement is known from US 39 79 908, at which is a supply circuit of a priority motor and a supply circuit an auxiliary motor via a priority valve be supplied with pressure medium.
- the priority valve has three ways and works with one loaded by a spring Control spool with two control edges. With a spool there is a fixed connection between an emerging one Supply current or priority current for the priority motor and a supply current or residual current for the Additional engine. If the priority flow is regulated further, the residual current is simultaneously regulated and vice versa. Furthermore, changes in pressure in the priority engine can occur and / or in the auxiliary motor cause the priority current is influenced undesirably.
- GB 2 238 355 B also includes a priority valve a spool known, which is arranged in a pump cover is.
- DE 33 20 047 C2 is a generic hydraulic Control device with a pump known via a Inlet of a first supply circuit for a priority motor and a second supply circuit for an auxiliary motor supplied with pressure medium.
- the priority motor is a throttle and a spool switched. One acts on the control slide at the throttle point tapped pressure difference against a spring force a feather. The spring loads the spool in the direction a starting position in which the connection to the priority motor is controlled. The pressure difference burdens the Control spool in the direction of a working position in which the Connection to the priority motor is controlled.
- control device has a second control slide, between the pump and the second supply circuit arranged and in by a spring with a spring force
- Direction of a starting position is loaded, in which the connection is controlled to the auxiliary engine.
- Towards one Working position is the spool from a pressure difference loaded, in which the connection to the additional motor is opened is.
- the pressure difference on the second spool is also on the in the first supply circuit arranged throttle point tapped, i.e. in the first supply circuit there is a first tap downstream after the first control spool and a second tap downstream after the throttle.
- the control spools are connected in parallel. At the first spool and the second control spool is the same Pressure difference on, whereby the spool is coupled together are. Does the first spool in the first supply circuit the second spool closes at the same time depending on a spring curve on the second spool acting spring further and vice versa.
- the features of claim 1 is the second spool stressful pressure difference in the inlet and downstream after the throttle point arranged in the first supply circuit tapped.
- the first spool and the second spool are loaded with different pressure differences, that can take different values from each other.
- the Control spools are decoupled from each other and can set independently, especially the second one Control spool, creating a control device for different Applications or systems can be used. An adjustment the valve arrangement can be avoided. Further are interactions in the transition area, such as pressure increases and pressure drops avoidable.
- the spring to act stronger on the second spool as the spring acting on the first spool namely that the second spool at about 2 bar later to the auxiliary motor opens as the first control spool to the priority motor closes. This can always make it a sufficient one Priority stream can be guaranteed.
- the pump pressure acts on a cover of a pump and depending on the rigidity caused by the pump pressure deformed.
- the two spools in one cover to arrange the pump.
- a long spool can pass through two short control spools with only one control edge each be replaced.
- the lid can do less stiff and inexpensive.
- At least one of the control slides is advantageous cup-shaped in the direction of the spring.
- the throttle point in the first supply circuit where the Pressure difference for the first spool can be tapped, arranged in the cover, the cover or the pump is a component, that advantageously manufactured separately and on its function can be checked and adjusted. Mistakes can be recognized early and avoided. Elaborate adjustment work after installing the pump, for example in a motor vehicle, can be avoided and final assembly can be accelerated.
- Fig. 1 shows a schematic representation of a hydraulic Control device, wherein Fig. 2 is a corresponding structural executed valve arrangement shows.
- the control device has a pump 10, the first via an inlet 12 Supply circuit 14 for a priority motor, not shown and a second supply circuit 16 for one Supplementary motor, not shown, supplied with pressure medium.
- the pump can also advantageously be designed as a variable displacement pump his.
- In the first supply circuit 14 of the priority engine is an adjustable throttle point 18 or orifice and switched a 2-way throttle valve with a control slide 24.
- the pressure difference is via a radial bore 84 and an axial bore 46 in the spool 24 downstream before the throttle point 18 and via a control line 48 after the throttle point 18 tapped (Fig. 2).
- the holes 46, 84 open into a control chamber 64, the pressure on one of the End face 50 of control spool 24 facing away from spring 22 works.
- the control line 48 opens into a spring chamber 66, their pressure on an end face 52 facing the spring 22 of the control slide 24 acts.
- the spring 22 loads the spool 24 in the direction of a starting position 28, in the the connection to the priority motor is open.
- the pressure difference loads the spool 24 against the spring force towards a working position 30 in which the connection is controlled to the priority motor.
- the control device also has a second 2-way throttle valve with a spool 32 which between the Pump 10 and the second supply circuit 16 is arranged.
- the control slide 32 is of a spring 40 with a spring force in the direction of a starting position 36, in the the connection to the auxiliary motor is activated. Further is the control slide 32 against a pressure difference against Resilient in the direction of a working position 38 resilient, in which the connection to the additional motor is open.
- the load on the second control slide 32 Pressure difference in the inlet 12 and downstream after that in the first Supply circuit 14 arranged throttle point 18 tapped. The pressure difference is measured with a first tap in the Inlet 12 via a radial bore 86 and an axial bore 54 in the control slide 32 and with a second tap downstream after the throttle point 18 in the first supply circuit 14 tapped via a control line 56.
- the bores 54, 86 open into a control chamber 68, the Pressure on an end face 58 of the spring 40 facing away Control spool 32 acts.
- the control line 56 opens into one Spring chamber 70, the pressure of which faces the spring 40 Front side 60 of the control slide 32 acts (FIG. 2).
- the radial bores 84, 86 designed as chokes and in the control line 48, 56 throttling points 62 are arranged.
- the first spool 24 throttles the priority stream 106 with a Control edge 72.
- the second control slide 32 opens with a control edge 74 the connection to the auxiliary motor, which with a residual current 108 is supplied.
- the control slide 24, 32 are decoupled from one another and can set up separately.
- the control slide 24, 32 are in two slide bores 76, 78 arranged in a cover 42 of the pump 10 (FIG. 2).
- the Slide bores 76, 78 are on the outside via screw closures 80, 82 closed.
- the spool would be possible 24, 32 to be arranged in a slide hole is divided into two areas by a partition.
- Fig. 3 shows a variant of that shown in Fig. 1 Valve arrangement. Substantially the same components are basically the same in the exemplary embodiments Numbered reference numerals.
- the first spool 24 is executed the same as in the embodiment in Fig. 2. Im In contrast to the embodiment in Fig. 2, the inlet opens 12 in a control chamber 88 of a second control spool 34 and acts directly on a slide surface 90 in the direction the spring 40. An additional control chamber, space and Costs can be saved.
- the spool 24, 34th are shown partially cut. To save installation space and easy to control spool 24, 34 are the Control slide 24, 34 in the direction of the springs 22, 40 cup-shaped educated. In the control edges 72, 74 are for fine control Control notches 96, 102 introduced.
- FIG. 4 shows a valve arrangement in a cover 44, the one spool 26 for the first supply circuit 14 with an integrated orifice or throttle 20 has.
- the priority motor is through a radial bore 92 and an axial bore 94 with the pump 10 in the starting position 28 connected, wherein in the axial bore 94 Measuring aperture 20 is used.
- the pump pressure in a control chamber 64 via the radial bore 92 and via an axial bore 98 to an end face 50 of the control slide 26.
- In the direction of the spring 22 acts Pump pressure minus the pressure drop at the orifice 20 via the orifice 20 to the spool 26.
- the spool 26 throttles a priority stream 106 to the priority motor with a control edge 104.
- control pressure in the direction of the spring 40 of the second control spool 34 is in the cover 44 via a control line 100 tapped after the orifice 20 on the first supply circuit 14.
Landscapes
- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Fluid Mechanics (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Fluid-Pressure Circuits (AREA)
Abstract
Description
- Fig. 1
- eine schematische Darstellung einer hydraulischen Steuereinrichtung,
- Fig. 2
- einen Längsschnitt durch eine baulich ausgeführte Ventilanordnung und
- Fig. 3 u. 4
- Varianten nach Fig. 2.
- 10
- Pumpe
- 12
- Zulauf
- 14
- Versorgungskreis
- 16
- Versorgungskreis
- 18
- Drosselstelle
- 20
- Drosselstelle
- 22
- Feder
- 24
- Steuerschieber
- 26
- Steuerschieber
- 28
- Ausgangsstellung
- 30
- Arbeitsstellung
- 32
- Steuerschieber
- 34
- Steuerschieber
- 36
- Ausgangsstellung
- 38
- Arbeitsstellung
- 40
- Feder
- 42
- Deckel
- 44
- Deckel
- 46
- Bohrung
- 48
- Steuerleitung
- 50
- Stirnseite
- 52
- Stirnseite
- 54
- Bohrung
- 56
- Steuerleitung
- 58
- Stirnseite
- 60
- Stirnseite
- 62
- Drosselstelle
- 64
- Steuerkammer
- 66
- Federkammer
- 68
- Steuerkammer
- 70
- Federkammer
- 72
- Steuerkante
- 74
- Steuerkante
- 76
- Schieberbohrung
- 78
- Schieberbohrung
- 80
- Schraubverschluß
- 82
- Schraubverschluß
- 84
- Bohrung
- 86
- Bohrung
- 88
- Steuerkammer
- 90
- Schieberfläche
- 92
- Bohrung
- 94
- Bohrung
- 96
- Steuerkerbe
- 98
- Bohrung
- 100
- Steuerleitung
- 102
- Steuerkerbe
- 104
- Steuerkante
- 106
- Prioritätsstrom
- 108
- Reststrom
Claims (7)
- Hydraulische Steuereinrichtung mit zumindest einer Pumpe (10), die über einen Zulauf (12) einen ersten Versorgungskreis (14) für einen Vorrangmotor und einen zweiten Versorgungskreis (16) für einen Zusatzmotor mit Druckmittel versorgt, wobei in den ersten Versorgungskreis (14) des Vorrangmotors eine Drosselstelle (18, 20) geschaltet ist und eine an dieser Drosselstelle (18, 20) abgreifbare Druckdifferenz entgegen einer Federkraft einer Feder (22) auf einen ersten im ersten Versorgungskreis (14) angeordneten Steuerschieber (24, 26) wirkt, der von der Federkraft in Richtung einer Ausgangsstellung (28) belastet ist, in der die Verbindung zum Vorrangmotor aufgesteuert ist und von der Druckdifferenz in Richtung einer Arbeitsstellung (30) belastbar ist, in der die Verbindung zum Vorrangmotor zugesteuert ist und mit einem zweiten Steuerschieber (32, 34), der zwischen der Pumpe (10) und dem zweiten Versorgungskreis (16) angeordnet und von einer Feder (40) mit einer Federkraft in Richtung einer Ausgangsstellung (36) belastet ist, in der die Verbindung zum Zusatzmotor zugesteuert ist und von einer Druckdifferenz entgegen der Federkraft in Richtung einer Arbeitsstellung (38) belastbar ist, in der die Verbindung zum Zusatzmotor aufgesteuert ist, dadurch gekennzeichnet, daß die den zweiten Steuerschieber (32, 34) belastende Druckdifferenz im Zulauf (12) und stromabwärts nach der im ersten Versorgungskreis (14) angeordneten Drosselstelle (18, 20) abgegriffen ist.
- Steuereinrichtung nach Anspruch 1, dadurch gekennzeichnet, daß die auf den zweiten Steuerschieber (32, 34) wirkende Feder (40) stärker ausgelegt ist als die auf den ersten Steuerschieber (24, 26) wirkende Feder (22).
- Steuereinrichtung nach dem Oberbegriff des Anspruchs 1 oder nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, daß die Steuerschieber (24, 26, 32, 34) in einem Deckel (42, 44) der Pumpe (10) angeordnet sind.
- Steuereinrichtung nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, daß zumindest einer der Steuerschieber (24, 26, 32, 34) in Richtung der Feder (22, 40) becherförmig ausgebildet ist.
- Steuereinrichtung nach Anspruch 3 oder 4, dadurch gekennzeichnet, daß die Drosselstelle (20) im ersten Versorgungskreis (14) im Deckel (44) angeordnet ist.
- Steuereinrichtung nach einem der Ansprüche 3 bis 5, dadurch gekennzeichnet, daß beide Steuerschieber (32, 34) koaxial zueinander und jeweils in sacklochartigen Schieberbohrungen (76, 78) angeordnet sind, die zu entgegengesetzten Gehäuseseiten des Deckels (42) hin offen sind.
- Steuereinrichtung nach Anspruch 6, dadurch gekennzeichnet, daß in jeder Schieberbohrung (76, 78) die den Steuerschieber (32, 34) belastende Feder (22, 40) sich an einem die Schieberbohrung (76, 78) absperrenden Verschlußstopfen (80, 82) abstützt.
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE19912299 | 1999-03-19 | ||
DE19912299A DE19912299A1 (de) | 1999-03-19 | 1999-03-19 | Hydraulische Steuereinrichtung |
Publications (3)
Publication Number | Publication Date |
---|---|
EP1039144A2 true EP1039144A2 (de) | 2000-09-27 |
EP1039144A3 EP1039144A3 (de) | 2003-03-05 |
EP1039144B1 EP1039144B1 (de) | 2005-07-27 |
Family
ID=7901569
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP99124451A Expired - Lifetime EP1039144B1 (de) | 1999-03-19 | 1999-12-08 | Hydraulische Steuereinrichtung |
Country Status (2)
Country | Link |
---|---|
EP (1) | EP1039144B1 (de) |
DE (2) | DE19912299A1 (de) |
Families Citing this family (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE10047175A1 (de) * | 2000-09-22 | 2002-04-11 | Mannesmann Rexroth Ag | Verfahren und Steueranordnung zur Ansteuerung von hydraulischen Verbrauchern |
ITBO20060702A1 (it) * | 2006-10-12 | 2008-04-13 | Cnh Italia Spa | Impianto di distribuzione di olio in pressione in un veicolo, in particolare, in un trattore agricolo |
US11713775B2 (en) * | 2020-08-18 | 2023-08-01 | Deere & Company | Agricultural implements and hydraulic circuits therefor incorporating one or more priority valves |
Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3979908A (en) | 1975-09-29 | 1976-09-14 | The Cessna Aircraft Company | Priority flow valve |
DE3320047C2 (de) | 1983-06-03 | 1993-04-22 | Robert Bosch Gmbh, 7000 Stuttgart, De | |
GB2238355B (en) | 1989-10-21 | 1993-08-25 | Ultra Hydraulics Ltd | A gear pump |
Family Cites Families (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS5044523A (de) * | 1973-08-24 | 1975-04-22 | ||
DE3507122A1 (de) * | 1985-02-28 | 1986-08-28 | Mannesmann Rexroth GmbH, 8770 Lohr | Vorrangsteuerung fuer hydraulische verbraucher |
DE19719636C2 (de) * | 1997-05-09 | 2000-11-30 | Wessel Hydraulik | Hydraulische Vorrichtung mit regelbarer Pumpe zur Versorgung eines ersten und eines zweiten Verbrauchers |
-
1999
- 1999-03-19 DE DE19912299A patent/DE19912299A1/de not_active Withdrawn
- 1999-12-08 DE DE59912330T patent/DE59912330D1/de not_active Expired - Lifetime
- 1999-12-08 EP EP99124451A patent/EP1039144B1/de not_active Expired - Lifetime
Patent Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3979908A (en) | 1975-09-29 | 1976-09-14 | The Cessna Aircraft Company | Priority flow valve |
DE3320047C2 (de) | 1983-06-03 | 1993-04-22 | Robert Bosch Gmbh, 7000 Stuttgart, De | |
GB2238355B (en) | 1989-10-21 | 1993-08-25 | Ultra Hydraulics Ltd | A gear pump |
Also Published As
Publication number | Publication date |
---|---|
DE19912299A1 (de) | 2000-09-21 |
EP1039144B1 (de) | 2005-07-27 |
DE59912330D1 (de) | 2005-09-01 |
EP1039144A3 (de) | 2003-03-05 |
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