EP0676547B1 - Mengenregel-Vorrichtung für die Hochdruck-Hydraulik und Senkbremsventil - Google Patents
Mengenregel-Vorrichtung für die Hochdruck-Hydraulik und Senkbremsventil Download PDFInfo
- Publication number
- EP0676547B1 EP0676547B1 EP95105308A EP95105308A EP0676547B1 EP 0676547 B1 EP0676547 B1 EP 0676547B1 EP 95105308 A EP95105308 A EP 95105308A EP 95105308 A EP95105308 A EP 95105308A EP 0676547 B1 EP0676547 B1 EP 0676547B1
- Authority
- EP
- European Patent Office
- Prior art keywords
- regulating
- pressure
- piston
- load
- flow
- 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 - Lifetime
Links
- 230000001105 regulatory effect Effects 0.000 claims abstract description 30
- 238000006073 displacement reaction Methods 0.000 claims description 8
- 230000007935 neutral effect Effects 0.000 claims 1
- 238000005259 measurement Methods 0.000 abstract 4
- 230000004075 alteration Effects 0.000 abstract 1
- ZZUFCTLCJUWOSV-UHFFFAOYSA-N furosemide Chemical compound C1=C(Cl)C(S(=O)(=O)N)=CC(C(O)=O)=C1NCC1=CC=CO1 ZZUFCTLCJUWOSV-UHFFFAOYSA-N 0.000 description 27
- 238000010276 construction Methods 0.000 description 5
- 238000011144 upstream manufacturing Methods 0.000 description 5
- 230000002457 bidirectional effect Effects 0.000 description 4
- 230000036316 preload Effects 0.000 description 2
- 230000001276 controlling effect Effects 0.000 description 1
- 230000003247 decreasing effect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 238000007726 management method Methods 0.000 description 1
- 238000000034 method Methods 0.000 description 1
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
- 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
- F15B13/04—Fluid distribution or supply devices characterised by their adaptation to the control of servomotors for use with a single servomotor
- F15B13/0416—Fluid distribution or supply devices characterised by their adaptation to the control of servomotors for use with a single servomotor with means or adapted for load sensing
- F15B13/0417—Load sensing elements; Internal fluid connections therefor; Anti-saturation or pressure-compensation valves
Definitions
- the invention relates to a quantity control device according to the preamble of claim 1 and a Lowering brake valve in the preamble of claim 7 specified type.
- a quantity control device known from DE-A-39 38 560 limits the speed of a one-way load Hydro consumer in both directions of movement in different ways.
- the quantity control device namely forms a two-way flow controller for Lowering movements and a three-way flow regulator for lifting movements.
- a common one when lifting and lowering in orifice in the same direction of flow is assigned to two parallel pressure regulator regulating orifices.
- This flow control device has a complicated structure and only for one powered by the pump Hydro consumer useful, when controlling it when Lifting pressure medium flowing to the tank does not matter plays. With several from a common pressure source this is inappropriate for supplied consumers because that pressure medium flowing to the tank supplies others Consumers affected. With a lifting device like one Lift truck, especially an electrically powered one Forklift trucks, if this flow control device were not practical, because of what is pumped to the tank when lifting Pressure medium electrical energy is wasted or at the supply of other parallel consumers of pressure medium is missing.
- lifting devices especially forklifts, are mostly several hydro consumers are provided, at least of which one is subordinate in the sense that it has no load lifting and has to perform lowering movements, but for movement control one essentially always the same Load moving device component is used.
- the Swiveling movement is at maximum speed in each direction limited.
- this Type is also a speed-controlled pump in the hydraulic circuit usual, the delivery rate of the pump speed is proportional and can be regulated in such a way that they practically from standstill with increasing speed delivers an increasing output.
- Subordinate hydraulic consumer can pump in the respective one, selected by the directional valve Direction of movement up to its limit speed start up.
- the limit speed is determined by a Lowering brake observed in each direction.
- two lowering brake valves are provided, each of which flows out in its working pressure line Pressure medium amount limited while moving in the direction of inflow opens without throttling.
- the construction effort of two Lowering brakes in the working pressure lines is high because one orifice plate and one for each flow direction Pressure compensator orifice plate and a bypass for the unthrottled Flow are needed.
- Control device of a double-acting Hydro consumer is in the on the piston side Working chamber of the hydraulic consumer connected Work management included a single control panel that alternately with an orifice plate of two in the direction Control valve provided measuring orifices cooperates, in each case in one flow direction Quantity dependence on the deflection of the directional control valve to regulate, either that of the piston side Incoming or out of the working chamber quantity flowing out of the piston-side working chamber. Because of of the two, alternately assigned to the only control panel Orifice plates also become a multi-position directional control valve for swapping the pressure compensator control pressures needed to the pressure compensator in each flow direction to control accordingly.
- the pressure compensator is also express of the directional control valve containing the orifice plates and the multi-position directional control valve are structurally separate. This requires considerable construction effort and considerable circuit and space requirements.
- the invention has for its object a quantity control device and a lowering brake valve from the DE-A-39 38 560 to create known type in which the Speed limit of the hydro consumer in both directions of movement with little structural effort and reduced circuit and space requirements possible is.
- the flow control device can despite Speed limit of the hydro consumer in no unnecessary pressure medium in both directions of movement stream unused. Other intended in parallel As a result, consumers become Control process of the aforementioned hydro consumer properly supplied. In the event that no other Hydro consumer is operated simultaneously or is present, can be the one usually provided Safety valve in the pressure supply for draining excess pressure medium are used.
- the Flow control device is particularly suitable for Cooperation with a speed-controlled pump that a speed control until the intervention of the Quantity control device enables and also with several Consumers the required delivery rate provides. Be next to the one with the Flow control device monitored hydraulic consumers no other hydraulic consumers actuated, then the speed-controlled pump only the currently necessary Deliver flow rate so that no pump drive energy is wasted. This is particularly the case with lifting devices advantageous whose hydraulic pump from a battery is supplied.
- the quantity control device according to claim 2 used excess pressure medium for the supply at least of another hydro consumer. It could be excess Pressure over the Safety pressure relief valve can be drained.
- the subordinate hydro consumer only so much pressure medium, how the pressure compensator control panel lets through. From that priority, other hydro consumers, whose Operated by the subordinate and in both directions Hydro consumer limited to maximum speeds is not affected.
- the Pump only as much pressure medium ready as that Pressure compensator control orifice at the speed limit needs.
- the speed can be reduced up to this delivery rate of the hydraulic consumer by means of the pump speed adjust. Only then will the pump deliver more Pressure medium when supplying additional hydraulic consumers are.
- means of the directional control valve the respective direction of movement of the hydro consumer selected.
- the quantity control device is in every direction of movement of the hydro consumer effective.
- the quantity control device in a single working pressure line housed. Nevertheless, the speed of movement of the hydro consumer in both directions of movement limited.
- a structurally simple, compact and reliable Embodiment of the lowering brake valve goes from claim 8 forth.
- the two pressure compensator control orifices are designed that they are open together in the normal position and each in the direction of flow they monitor from the open position towards its shut-off position curtail. This avoids unnecessary flow losses at low speed of the hydro consumer.
- the Passages housed in a small space to save space. Nevertheless, the control behavior is clean.
- the embodiment according to claim 15 is special space-saving.
- the one integrated into the screw-in housing Lowering brake valve is a unit that into the working pressure line or a channel of the Hydro consumer screwed.
- a hydraulic control device S e.g. a lifting device, such as a forklift or forklift, has a pump P sucking from a tank T, which a pump line 1 feeds.
- a tank line leads to the tank 2.
- a safety pressure relief valve 3 is provided between the pump and tank lines 1, 2 .
- the pump P can be a speed-controlled pump, the Flow rate is proportional to the pump speed.
- a Hydro consumer V e.g. a double-acting hydraulic cylinder 5, with a piston side and a piston rod side Working chamber 6, 7 is via working pressure lines 3, 4 to a directional control valve W (4/3-way control valve with blocked zero position) connected, with which the direction of movement of the hydro consumer 5 is adjustable.
- a flow control device M In the working pressure line 3 is a flow control device M, additionally in the form of a Two-way lowering brake valve Z, provided.
- another hydro consumer V1 is over a working pressure line 8 and another directional control valve W1 to the pump line 1 or the tank line 2 connected.
- the hydraulic consumer V can Swivel adjustment, e.g. a lifting fork, after both Directions can be provided while the hydro consumer V1 used for another function of the lifting device is.
- the bidirectional lowering brake valve Z has a (in the present Case fixed) orifice 9 and a Pressure compensator control orifice arrangement 10, which has a Pilot line 11 with that in the working pressure line 3 prevailing between the chamber 7 and the orifice 9 Pressure and in the opposite direction via a pilot line 12 with the between the orifice 9 and the pressure compensator orifice arrangement 10 prevailing Pressure can be applied.
- a rule spring 13 (or two) is used to center the pressure compensator orifice plate arrangement 10 in an open normal position.
- FIG. 2 shows the construction of the quantity control device M or the bidirectional lowering brake valve Z shown. It is a screw-in valve, whose screw-in housing G with an external thread section 15 into an internally threaded section 14 of the working pressure line 3 is screwed in. It is conceivable the valve with a conventional block-shaped housing train and connections for the working pressure line 3 to provide.
- An axial bore in the housing G forms a housing chamber 16, in which a control piston designed as a hollow pot piston 17 sealed with a guide section 18 is guided. At the open piston end is 19 the measuring aperture 9 in the form of an aperture ring 36 with a Aperture bore 37 set.
- the piston crown contains at least one throttle passage 21 to a control chamber part 22 of the housing chamber 16. Am lower end of the screw-in housing G is a screw-in tool engagement point 23 provided.
- radial bores 24 are provided which a pair in Direction of displacement of the control piston 17 spaced first and form second control edges 25, 26.
- the housing chamber 16 is an open to the control piston 17 Circumferential groove 27 formed, the groove flanks also a Form a pair of first and second control edges 29, 28.
- the circumferential groove 27 open oblique bores 30 which for outer circumference adjacent to the external thread section 15 of the screw-in housing G.
- a control spring 13 surrounds the control piston end 19 and is via abutment parts 35 between stops 33 and 34 on Control piston 17 and between abutments 32 and 31 of the Screw-in housing fixed with preload.
- the abutment 32 is formed by a screw-in ring 40, with which the control piston 17 and the control spring 13 in the screw-in housing G are secured.
- the stop 33 will formed by a union nut 38 with which the orifice plate 9 against another orifice with different large orifice bore 37 set interchangeably is.
- the union nut 38 has a passage 39 which is also shaped as a turning aid.
- the control spring 13 serves to adhere to that shown in FIG. 2 Normal position of the control piston 17.
- the over the Measuring orifice occurring pressure difference affects that of Guide section 18 defined loading area of the control piston 17, which in Fig. 2 above the orifice 9 acting pressure down while the pressure below the orifice 9 above the Passage 21 in the control chamber part 22 in the direction of displacement acts upwards.
- the directional control valve W is changed to the direction of movement of the hydro consumer V, then that will Lowering brake valve Z in the opposite flow direction 42 flows through.
- the higher pressure then upstream the orifice 9 acts through the passage 21 in the control chamber part 22 on the pressure surface of the control piston 17, while the lower pressure downstream of the Measuring aperture 9 in the opposite direction to the Control piston 17 acts.
- the control piston 17 is shown in FIG. 4 adjusted upwards.
- the cross-cooperating control edges 26, 28 regulate the amount of pressure medium so far until the pressure difference across the orifice 9 again corresponds to predetermined value, the movement speed of the hydraulic consumer V in the new adjustment direction is limited.
Landscapes
- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Fluid Mechanics (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Fluid-Pressure Circuits (AREA)
- Braking Systems And Boosters (AREA)
- Fluid-Driven Valves (AREA)
- Valves And Accessory Devices For Braking Systems (AREA)
Description
- Fig. 1
- eine hydraulische Steuervorrichtung als Blockschaltbild,
- Fig. 2
- einen Längsschnitt durch eine Mengenregelvorrichtung bzw. ein Senkbremsventil, das in Fig. 1 symbolisch dargestellt ist, in der Normalstellung,
- Fig. 3
- die linke Hälfte eines Längsschnitts des Senkbremsventils von Fig. 2 in einer Regelstellung, und
- Fig. 4
- die rechte Hälfte eines Längsschnittes desselben Senkbremsventils in einer anderen Regelstellung.
Claims (15)
- Mengenregelvorrichtung (S) für die Hochdruck-Hydraulik, mit der in einem Hydraulikkreis der Druckmittelstrom zu und von einem Hydro-Verbraucher (V) von wenigstens einem mit einer Druckquelle (P) verbindbaren Hydroverbraucher (V, V1) unabhängig von Druck- und/oder Laständerungen begrenzbar ist, mit einer Meßblende (9), der für jede Strömungsrichtung eine die von der Meßblende (9) vorgegebene Druckdifferenz einstellende Druckwaagen-Regelblende (25-29) zugeordnet ist, und mit wenigstens einer vom Hydraulikkreis abzweigenden Leitung, (1, 2) dadurch gekennzeichnet, daß die Meßblende (9) mit den beiden Druckwaagen-Regelblenden (25-29) in einem Zweirichtungs-Senkbremsventil (Z) mit ausschließlicher Zweiwege-Stromregelfunktion für jede Strömungsrichtung (41,42) baulich zusammengefaßt in einem Abschnitt einer Arbeitsdruckleitung (3) angeordnet sind, und daß die abzweigende Leitung (1,2) an der dem Hydro-Verbraucher (V) abgewandten Seite des Zweirichtungs-Senkbremsventils (Z) vorgesehen ist.
- Mengenregelvorrichtung nach Anspruch 1, dadurch gekennzeichnet, daß an die abzweigende Leitung (1,2) wenigstens ein weiterer Hydro-Verbaucher (V1) und/oder ein Sicherheits-Druckbegrenzungsventil (3) angeschlossen ist (sind).
- Mengenregelvorrichtung nach den Ansprüchen 1 und 2, dadurch gekennzeichnet, daß der mit dem Zweirichtungs-Senkbremsventil (Z) überwachte Hydro-Verbraucher (V) gegenüber dem an die abzweigende Leitung angeschlossenen Hydro-Verbraucher (V1) nachrangig ist.
- Mengenregelvorrichtung nach wenigstens einem der Ansprüche 1 bis 3, dadurch gekennzeichnet, daß die Arbeitsdruckleitungen (3,4) an eine drehzahlgeregelte Pumpe (P) angeschlossen sind, deren Fördermenge zur Pumpendrehzahl proportional ist.
- Mengenregelvorrichtung nach wenigstens einem der Ansprüche 1 bis 4, dadurch gekennzeichnet, daß zwischen der Pumpe (P) und dem Zweirichtungs-Senkbremsventil (Z) ein Wegesteuerventil (W) zum Einstellen der Bewegungsrichtung des Hydro-Verbrauchers (V) angeordnet ist.
- Mengenregelvorrichtung nach wenigstens einem der Ansprüche 1 bis 5, dadurch gekennzeichnet, daß der Hydro-Verbraucher (V) ein doppeltwirkender Hydraulikzylinder (5) ist, der eine kolbenseitige und eine kolbenstangenseitige Arbeitskammer (6,7) aufweist, daß beide Kammern (6,7) über Arbeitsdruckleitungen (3,4) und das Wegesteuerventil (W), vorzugsweise ein 4/3-Wege-Steuerventil mit blockierter Nullstellung, wahlweise an eine Pumpenleitung (1) und eine Tankleitung (2) anschließbar sind, und daß das Zweirichtungs-Senkbremsventil (Z) in der von der kolbenstangenseitigen Kammer (7) zum Wegesteuerventil (W) führenden Arbeitsdruckleitung (3) angeordnet ist.
- Senkbremsventil (Z) zum Begrenzen der maximalen Bewegungsgeschwindigkeit eines Hydroverbrauchers (V) unabhängig von Last- oder Druckschwankungen, mit einer Meßblende (9) und einer die Druckdifferenz über die Meßblende (9) einstellenden Druckwaagen-Regelblende (25-29), die für eine Strömungsrichtung einen Zweiwege-Stromregler in einer Arbeitsdruckleitung des Hydro-Verbrauchers bilden, dadurch gekennzeichnet, daß die Meßblende (9) mit einer zweiten Druckwaagen-Regelblende (25,26,28,29) für die andere Strömungsrichtung einen zweiten Zweiwege-Stromregler in derselben Arbeitsdruckleitung (3) bildet, und daß die beiden Zweiwege-Stromregler in einem Zweirichtungs-Senkbremsventil (Z) zusammengefaßt sind und abwechselnd die Bewegungsgeschwindigkeiten des Hydro-Verbrauchers (V5) in beiden Bewegungsrichtungen begrenzen.
- Senkbremsventil nach Anspruch 7, dadurch gekennzeichnet, daß in einer an einer Seite über die Meßblende (9) anströmbaren Gehäusekammer (16) ein hohler Regelkolben (17) abgedichtet und in jeder Strömungsrichtung (41,42) gegen die Kraft einer Regelfeder (13) verschiebbar geführt ist, daß der Regelkolben (17) in der Gehäusekammer (16) eine Beaufschlagungsfläche aufweist, die in einer Verschieberichtung des Regelkolbens (17) mit dem Druck an einer Seite der Meßblende (9) und in der anderen Verschieberichtung mit dem Druck an der anderen Seite der Meßblende (9) beaufschlagbar ist, und daß Strömungsdurchgänge (24) im Regelkolben (17) und in der Wand der Gehäusekammer (16) zwei Paare erster und zweiter, in Verschieberichtung des Regelkolbens (17) beabstandeter Steuerkanten (25,26,28,29) bilden, von denen in Abhängigkeit von der Strömungsrichtung wechselseitig und kreuzweise jeweils die ersten oder die zweiten als Regelblende kooperieren.
- Senkbremsventil nach Anspruch 8, dadurch gekennzeichnet, daß der Regelkolben (17) als Topfkolben mit außenliegendem Führungsabschnitt (18) ausgebildet ist, daß der Topfkolben im Kolbenboden (20) einen Durchgang (21) zu einem Steuerkammerteil (22) der Gehäusekammer (16) und in dem Kolbenboden (20) abgewandten Kolbenende (19) die Meßblende (9), vorzugsweise als austauschbaren Blendenring (36), aufweist.
- Senkbremsventil nach Anspruch 8, dadurch gekennzeichnet, daß für beide Verschieberichtungen des Regelkolbens (17) eine gemeinsame Regelfeder (13) vorgesehen ist, die mit, vorzugsweise einstellbarer, Vorspannung zwischen axial beabstandeten Anschlägen (33,34) des Regelkolbens (17) und axial beabstandeten Widerlagern (31,32) der Gehäusekammer (16) derart eingespannt ist, daß je nach Verschieberichtung des Regelkolbens (17) ein sich von einem Widerlager abhebendes Federende am Anschlag und das jeweils andere, sich vom anderen Anschlag abhebende Federende am anderen Widerlager abgestützt ist.
- Senkbremsventil nach Anspruch 11, dadurch gekennzeichnet, daß in beiden Federenden hülsenartige Federwiderlagerteile (35) vorgesehen sind.
- Senkbremsventil nach den Ansprüchen 9 bis 11, dadurch gekennzeichnet, daß die Meßblende (9) am offenen Kolbenende (19) mittels einer durchgängigen Überwurfmutter (38) austauschbar festgelegt ist, die gleichzeitig den einen Anschlag (33) für die Regelfeder (13) bildet.
- Senkbremsventil nach den Ansprüchen 8 und 9, dadurch gekennzeichnet, daß für jede Verschieberichtung des Regelkolbens (17) eine eigene, vorgespannte Regelfeder vorgesehen ist, und daß, vorzugsweise, die Vorspannung oder Steifigkeit der einen Regelfeder unabhängig von der Vorspannung oder Steifigkeit der anderen Regelfeder veränderbar ist.
- Senkbremsventil nach Anspruch 8, dadurch gekennzeichnet, daß die Strömungsdurchgänge (24) im Regelkolben (17) in Umfangsrichtung verteilte Radialbohrungen sind, und daß die in der Wand der Gehäusekammer vorgesehenen Strömungsdurchgänge, z.B. in Form von Schrägbohrungen (30), in eine zum Regelkolben (17) offene Umfangsnut (29) münden, deren Nutflanken ein, aus erster und zweiter Steuerkante (29,28) bestehendes Paar der Steuerkanten bilden.
- Senkbremsventil nach wenigstens einem der Ansprüche 7 bis 14, dadurch gekennzeichnet, daß die Gehäusekammer (16) in einem Einschraubgehäuse (G) vorgesehen ist, das zwischen den Strömungsdurchgängen (30) und einem dem frei anströmbaren Kolbenende (19) zugeordneten Gehäuseteil einen Außengewindeabschnitt (15) sowie eine axial zugängliche Drehhandhabe (23) aufweist.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE9405872U DE9405872U1 (de) | 1994-04-08 | 1994-04-08 | Senkbremsventil und Mengenregel-Vorrichtung für die Hochdruck-Hydraulik |
| DE9405872U | 1994-04-08 |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| EP0676547A1 EP0676547A1 (de) | 1995-10-11 |
| EP0676547B1 true EP0676547B1 (de) | 1999-07-07 |
Family
ID=6907088
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| EP95105308A Expired - Lifetime EP0676547B1 (de) | 1994-04-08 | 1995-04-07 | Mengenregel-Vorrichtung für die Hochdruck-Hydraulik und Senkbremsventil |
Country Status (3)
| Country | Link |
|---|---|
| EP (1) | EP0676547B1 (de) |
| AT (1) | ATE181991T1 (de) |
| DE (2) | DE9405872U1 (de) |
Families Citing this family (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE19632201A1 (de) * | 1996-08-09 | 1998-02-12 | Bosch Gmbh Robert | Hydraulische Steuereinrichtung |
| US6116263A (en) * | 1998-07-23 | 2000-09-12 | Hydraforce, Inc. | Proportional priority flow regulator with reverse flow control |
| FR2846718B1 (fr) * | 2002-10-31 | 2006-11-17 | Linde Ag | Vanne installee sur un verin |
| DE102007027603A1 (de) * | 2007-06-12 | 2008-12-18 | Voith Patent Gmbh | Hydraulischer Antrieb, insbesondere für Werkzeugmaschinen, und Verfahren zum Steuern des hydraulischen Antriebs |
| CN111692154A (zh) * | 2020-06-23 | 2020-09-22 | 三一海洋重工有限公司 | 限速阀 |
| CN111734352B (zh) * | 2020-07-17 | 2024-07-23 | 西南石油大学 | 一种布酸效果好的均匀布酸装置 |
Family Cites Families (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE3139944A1 (de) * | 1981-10-08 | 1983-04-28 | Robert Bosch Gmbh, 7000 Stuttgart | Hydraulische steuereinrichtung zur lastunabhaengigen steuerung eines doppeltwirkenden servomotors |
| FR2551171B1 (fr) * | 1983-08-22 | 1990-04-20 | Cessna Aircraft Co | Valve de commande perfectionnee de limitation de debit et d'equilibrage de pression |
| DE3422978C2 (de) * | 1984-06-22 | 1995-07-20 | Bosch Gmbh Robert | Vorrichtung zur Steuerung einer hydraulischen Stelleinrichtung |
| DE3605980A1 (de) * | 1985-03-05 | 1986-10-16 | Barmag Barmer Maschinenfabrik Ag, 5630 Remscheid | Proportionalventil mit druckdifferenzwaage |
| DE3938560A1 (de) * | 1989-11-21 | 1991-05-23 | Bosch Gmbh Robert | Hydraulische steuereinrichtung |
-
1994
- 1994-04-08 DE DE9405872U patent/DE9405872U1/de not_active Expired - Lifetime
-
1995
- 1995-04-07 AT AT95105308T patent/ATE181991T1/de not_active IP Right Cessation
- 1995-04-07 EP EP95105308A patent/EP0676547B1/de not_active Expired - Lifetime
- 1995-04-07 DE DE59506326T patent/DE59506326D1/de not_active Expired - Lifetime
Also Published As
| Publication number | Publication date |
|---|---|
| DE59506326D1 (de) | 1999-08-12 |
| ATE181991T1 (de) | 1999-07-15 |
| EP0676547A1 (de) | 1995-10-11 |
| DE9405872U1 (de) | 1994-05-26 |
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