EP1415095B1 - Steuereinrichtung für die kontinuierliche bewegung eines hydraulischen stellmotors - Google Patents
Steuereinrichtung für die kontinuierliche bewegung eines hydraulischen stellmotors Download PDFInfo
- Publication number
- EP1415095B1 EP1415095B1 EP01974163A EP01974163A EP1415095B1 EP 1415095 B1 EP1415095 B1 EP 1415095B1 EP 01974163 A EP01974163 A EP 01974163A EP 01974163 A EP01974163 A EP 01974163A EP 1415095 B1 EP1415095 B1 EP 1415095B1
- Authority
- EP
- European Patent Office
- Prior art keywords
- piston
- restrictor
- bore
- control device
- opening
- 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
- 238000007789 sealing Methods 0.000 claims description 5
- 238000000034 method Methods 0.000 claims 1
- 239000012530 fluid Substances 0.000 abstract description 20
- 230000007935 neutral effect Effects 0.000 description 6
- 238000010586 diagram Methods 0.000 description 2
- 238000010276 construction Methods 0.000 description 1
- 238000006073 displacement reaction Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 238000003780 insertion Methods 0.000 description 1
- 230000037431 insertion Effects 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 229910001092 metal group alloy Inorganic materials 0.000 description 1
- 238000004381 surface treatment 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
- F15B11/00—Servomotor systems without provision for follow-up action; Circuits therefor
- F15B11/006—Hydraulic "Wheatstone bridge" circuits, i.e. with four nodes, P-A-T-B, and on-off or proportional valves in each link
-
- 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
- F15B13/0401—Valve members; Fluid interconnections therefor
- F15B13/0405—Valve members; Fluid interconnections therefor for seat valves, i.e. poppet 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
- 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
- F15B13/042—Fluid distribution or supply devices characterised by their adaptation to the control of servomotors for use with a single servomotor operated by fluid pressure
- F15B13/043—Fluid distribution or supply devices characterised by their adaptation to the control of servomotors for use with a single servomotor operated by fluid pressure with electrically-controlled pilot valves
- F15B13/0433—Fluid distribution or supply devices characterised by their adaptation to the control of servomotors for use with a single servomotor operated by fluid pressure with electrically-controlled pilot valves the pilot valves being pressure control 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
- F15B2211/30—Directional control
- F15B2211/305—Directional control characterised by the type of valves
- F15B2211/3056—Assemblies of multiple valves
- F15B2211/30565—Assemblies of multiple valves having multiple valves for a single output member, e.g. for creating higher valve function by use of multiple valves like two 2/2-valves replacing a 5/3-valve
- F15B2211/30575—Assemblies of multiple valves having multiple valves for a single output member, e.g. for creating higher valve function by use of multiple valves like two 2/2-valves replacing a 5/3-valve in a Wheatstone Bridge arrangement (also half bridges)
-
- 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
- F15B2211/30—Directional control
- F15B2211/32—Directional control characterised by the type of actuation
- F15B2211/329—Directional 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
- F15B2211/30—Directional control
- F15B2211/35—Directional control combined with flow control
- F15B2211/351—Flow control by regulating means in 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
- F15B2211/30—Directional control
- F15B2211/35—Directional control combined with flow control
- F15B2211/353—Flow control by regulating means in return line, i.e. meter-out control
Definitions
- the invention relates to a control device according to the preamble of Patent claim 1.
- Proportional valve arrangements as used for example as servo valve arrangements for Actuation of a hydraulic servomotor, e.g. in the form of a working cylinder 27 (FIG 1) can be composed of individual modules D1 to D4. These modules then form in the form of pilot-operated and pressure-proportional controlled Closing valves, the four controllable throttle devices D1, D2, D3, D4 one in Figure 1 illustrated hydraulic bridge circuit.
- Figure 1 shows the switching principle of such a servo valve assembly in the so-called Open Center Execution (open center execution) in Neutral position in which all four throttling devices are open, so that one of a Pump P from a tank T funded fluid almost unhindered over the Throttle devices can flow back to the tank T.
- Open Center Execution open center execution
- From the points A and B lead lines LA and LB to work spaces a and b of the working cylinder 27, the are separated by a working piston AK.
- the neutral position shown is the pressure in both working spaces a, b the same size, so that the working piston AK in Rest stays.
- To the movement of To be able to control the working piston is basically enough to connect in series two throttle devices D1 and D4, one of which must be controllable; there may be provided for the working piston, a spring which urges him in one direction, or the working space b may be at an otherwise controlled or constant pressure be kept, the amount of which between the pump pressure and the pressure of the tank (which is usually the atmospheric pressure) is.
- the invention relates to a control device with at least one controllable module (eg D1) or else with a pair of modules (eg D1 with D3).
- a controllable module eg D1
- a pair of modules eg D1 with D3
- such a module D1 is basically one in a valve block (Housing G) introduced housing bore 1, in which a piston 3 axially back and can be moved.
- a sealing element 4 on the piston circumference separates pressure chambers 2 and 5 from each other and at the same time acts as a low-friction guidance of the piston 3 in the Housing bore 1.
- a throttle needle 9 is moved by a force in a throttle opening 8.
- This throttle opening 8 is located in a captured disc 6, which also in a Housing G or in a lid D can be integrated and together with the Piston 3 and the housing bore 1 forms the pressure chamber 5.
- the axial force at the Throttle needle 9 may be mechanical, electromotive, electromagnetic, hydraulic or be applied pneumatically.
- the insertion of the throttle needle 9 in the Throttle opening 8 reduces the flow area for through a Vorordelelbohrung 12 via a channel 10 in a tank T flowing fluid flow.
- a higher pressure builds up in the pressure chamber 5
- the piston 3 is moved in the direction of the annular gap 17. This reduces the width of the annular gap 17, the connection from the inlet channel 14 to the outlet channel 13 manufactures.
- the fluid pressure in the inflow passage 14 increases to.
- the fluid pressure in the space 5 is proportional to the actuating force on the throttle needle 9.
- This Fluid pressure is in turn proportional to the fluid pressure in the inlet channel 14, whereby Overall, a proportionality between the force acting on the throttle needle 9 actuating force and adjusts the fluid pressure generated in the inlet channel 14.
- a hydraulic bridge circuit as in the case of Servo valves
- they can designed almost identical and shared by the throttle unit of a module D1, consisting of throttle needle 9 and throttle opening 8, are controlled.
- a hydraulic connection between on the one hand the pressure chamber 5 of a provided with a throttle unit module D1 and on the other hand the corresponding pressure chamber (53 in Figure 4) of one or more others Modules, which are then executed without throttle unit and without Vorordelbohrung 12 and be controlled.
- the hydraulic connection may preferably take the form of a be executed internal housing channel (1_3 in Figure 4).
- FIG. 4 shows the diagram of a servo valve arrangement designed in this way.
- Figure 4 goes from the state shown in Figure 3, in which D1 and D3 are open, while D2 and D4 are closed so that the pump pressure (pressure at the outlet of the Pump P) via the opened throttle device D1 in the direction of the arrow in Working space a of the working cylinder 27 acts on the working piston AK.
- both throttle pins 9 and 92 When used in a closed center (closed center) system, both throttle pins 9 and 92 maintain the associated throttle openings 8, 82 in the neutral state closed. If the working piston AK is to be moved to the right, for example, then the throttle needle 9 is moved to the left to open the throttle opening. In an open-center system, only one (active) of the throttle needles 9, 92 more or less pushed by a force in its throttle opening 8, 82, while on the other (passive) throttle needle no force acts, so that this throttle needle outside their throttle opening remains. Depending on the direction in which the working piston AK is to be moved, the throttle needles exchange their active or passive role.
- the throttle device D1 (and D3) is passive, the pressure conditions (taking into account the different sized pressurized areas on both sides of the piston 3) ensure that the annular gap 17 is wide open.
- Da D4 (and D2) (unlike in the neutral position of Figure 1) is almost closed, prevails at point A, a pressure above the pressure in the tank T, and via the line LA is in the Working space a pressure exerted in the direction of arrow on the working piston AK.
- D2 has almost been closed in the following way: First, the throttle opening 82 of D2 was even more open so that fluid could flow relatively unobstructed from the pump P via the inlet channel 142 through a Vorordelelbohrung 122 in the piston 32 and via the throttle opening 82 and the channel 2_T to the tank T. Then, the throttle opening 82 was closed more tightly by sliding the throttle needle 92 to the left. As a result, a higher pressure has built up in the pressure chamber 52, which resulted in a displacement of the piston 32 to the left.
- the advantage of the modules implemented according to the description lies in their simple nature and cost-reducing construction. As opposed to the usual on the perimeter sealing longitudinal slide and rotary valve sleeve units sealed here end cash becomes, eliminates the tainted with tolerances and thus production-consuming Fit between slide and bore. This is associated with a waiver special materials and their expensive processing in terms of surface and Heat treatment.
- the described module has pistons and housing a light metal alloy proved sufficient even for high fluid pressures.
- the spring elements 11 shown in Figure 2; which is also sunk by a large one (eg built-in) spring element 11a (shown at D4 in Figure 4) can be replaced in the neutral position, the task, the piston 3 in the direction of the annular gap 17 press that by throttling the fluid flow in the annular gap 17 a predeterminable Pressure difference arises when the throttle effect occurs at the choke unit, consisting of throttle needle 9 and throttle opening 8, a compressive force on the end face 16 ( Figure 2) allows the piston 3, which overcomes the friction of the sealing element 4. This friction is additionally by the spring force of the spring element 11th overcome.
- the throttle opening 8 is located in a disc 6. the rear end of the Pressure chamber 5 forms.
- the flowing through the throttle opening 8 in the space 7 fluid is passed through line 10 in Figure 2 (or 1_T in Figure 4) into the tank T of the system recycled.
- control device with the features of claim 1 is a high leakage fluid flow avoided and thereby the work of the Working piston of a controlled working cylinder increased.
- a high leakage fluid flow can be avoided when the piston 3 is designed so that in its end face 16 (Figure 2) the pilot hole 12 opens and their local bore opening by the abutment of the end face 16 against the stop surface 60 of the disc 6 (or at another corresponding stop surface for the piston 3) is closed when the piston 3 is pressed by pressurizing its end face 15 against the stop surface 60 of the disc 6 (or against another corresponding stop surface for the piston 3).
- Figure 4 in the module D1.
- the pilot bores 12, 122 need not be in the controllable throttle devices D1, D2 can be arranged, but instead can be in the co-controlled Throttle devices D3, D4 are: compare there the reference numerals 123 and 124th If in such a modified arrangement according to Figure 4, the throttle device D2 from opened in the closed state is to be controlled first Pilot fluid flow from the pump P via the inlet channel 14, the discharge channel 13, the Pilot bore 124 in the piston of the throttle device D4, the connecting channel 2_4, the pressure chamber 52, the throttle opening 82, the connecting channel 2_T to the tank T. flow.
- the pressure in Pressure chamber 52 rise and move the piston 32 in the closing direction. simultaneously increases the pressure in the pressure chamber 54 of D4, so that the piston of D4 in Closing direction moves.
- the control device according to the invention is particularly suitable for hydraulic auxiliary or power steering systems in open-center execution, because they have there the problem of unwanted leakage at fully opened annular gap 17 triggers; but she is also for suitable for use in a closed-center system.
Landscapes
- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Fluid Mechanics (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Fluid-Pressure Circuits (AREA)
- Servomotors (AREA)
Description
Bei einem Open-Center-System wird immer nur eine (aktive) der Drosselnadeln 9, 92 durch eine Stellkraft mehr oder weniger in ihre Drosselöffnung 8, 82 geschoben, während auf die andere (passive) Drosselnadel keine Stellkraft wirkt, so dass diese Drosselnadel außerhalb ihrer Drosselöffnung bleibt. Je nachdem in welche Richtung der Arbeitskolben AK verschoben werden soll, vertauschen die Drosselnadeln ihre aktive bzw. passive Rolle.
Zunächst war die Drosselöffnung 82 von D2 noch stärker geöffnet, so dass Fluid relativ unbehindert von der Pumpe P über den Zulaufkanal 142 durch eine Vordrosselbohrung 122 im Kolben 32 und über die Drosselöffnung 82 und den Kanal 2_T zum Tank T fließen konnte. Dann wurde die Drosselöffnung 82 durch Verschieben der Drosselnadel 92 nach links stärker verschlossen. Dadurch hat sich im Druckraum 52 ein höherer Druck aufgebaut, was eine Verschiebung des Kolbens 32 nach links zur Folge hatte. Dadurch ist für das von der Pumpe kommende Fluid der Weg vom Zulaufkanal 142 zum Ablaufkanal 132 (und damit zum Punkt B und zur Drosseleinrichtung D3 und zum Tank T) nahezu verschlossen worden, und der Druck am Punkt B nahezu auf den Druck im Tank T verringert worden.
Claims (8)
- Steuereinrichtung für die kontinuierliche Bewegung eines hydraulischen Stellmotors (27)
mit folgenden Merkmalen:dadurch gekennzeichnet, dass ein Ende der Vorsteuerbohrung (12) an der an den Ringspalt (17) grenzenden Seite des Kolbens (3) im Bereich des Zuflusskanals (14) so angeordnet ist, dass es selbst bei geschlossenem Ringspalt (17) geöffnet bleibt, unda) in einem hydraulischen Strömungspfad zwischen einer Pumpe (P) und einem Tank (T) sind in Serie zwei Drosseleinrichtungen (D1, D4) vorgesehen, zwischen denen eine hydraulische Leitung (LA) abzweigt, die zu dem Arbeitsraum (a) des Stellmotors führt;b) eine der Drosseleinrichtungen besteht aus einer steuerbaren Drossel (D1) mit einem Kolben (3) in einer Gehäusebohrung (1), der auf einer Seite einen Ventilteller trägt, der einen Ringspalt (17) zwischen einem Zuflusskanal (14) und einem Abflusskanal (13) begrenzt,c) der Druckabfall am Ringspalt (17) ist mittels einer axial in eine Drosselöffnung (8) bewegbaren Drosselnadel (9) kontinuierlich steuerbar, welche auf der anderen Seite des Kolbens (12) in einem hydraulischen Steuerpfad angeordnet ist,d) der Steuerpfad erstreckt sich vom Zuflusskanal (14) über die Drosselöffnung (8) zum Tank (T), wobei er durch eine Vorsteuerbohrung (12) im Kolben (3) und durch einen Druckraum (5) geführt ist, der zwischen Kolben (3) und Drosselöffnung (8) angeordnet ist,
dass das andere Ende der Vorsteuerbohrung (12) auf der anderen Seite des Kolbens (3) dort angeordnet ist, wo der Kolben (3) bei vollständigem Öffnen der steuerbaren Drossel (D1) gegen eine Anschlagfläche (60) stößt und dabei dieses andere Ende der Vorsteuerbohrung (12) selbsttätig schließt. - Steuereinrichtung nach Anspruch 1, dadurch gekennzeichnet,dass zwei baugleiche Paare von Drosseleinrichtungen vorgesehen sind, jedes Paar bestehend aus zwei Drosseleinrichtungen, insgesamt also vier Drosseleinrichtungen (D1, D2, D3, D4), die jeweils axial bewegliche Kolben (3, 32, 33, ...) aufweisen,
wobei jeweils eine Drosseleinrichtung (D1 bzw. D2) eines Paares (D1, D3 bzw. D2, D4) mittels einer Drosselnadel (9, 92) in einer Drosselöffnung (8; 82) steuerbar ist und ihr Kolben (3, 32) mit einer Anschlagfläche (60, 61) in einer Gehäusebohrung (1) einen Druckraum (5) bildet
und wobei der Kolben (33) einer zweiten zu dem Paar von Drosseleinrichtungen gehörenden Drosseleinrichtung (D3) mit ihrem Gehäuse (G) einen weiteren Druckraum (53) bildet, der mit dem Druckraum (5) der ersten Drosseleinrichtung (D1) dieses Paares über eine Leitung (1_3) in hydraulischer Verbindung steht,und dass jeweils eine Drosseleinrichtung (D1 oder D3 bzw. D2 oder D4) jedes Paares (D1, D3 bzw. D2, D4) eine von Stirnfläche zu Stirnfläche des Kolbens (3) führende Vordrosselbohrung (12) aufweist, die so angeordnet ist, daß ihre einem Zuflusskanal (14) zuwandte Bohrungsöffnung in jeder Kolbenstellung geöffnet ist, während ihre andere Bohrungsöffnung bei gegen die Anschlagfläche (60) bewegtem Kolben (3) geschlossen ist. - Steuereinrichtung nach Anspruch 1 oder 2, dadurch gekennzeichnet, dass die Anschlagfläche (60) Teil eines Deckels (D) für die Gehäusebohrung (1) ist.
- Steuereinrichtung nach Anspruch 1 oder 2, dadurch gekennzeichnet, dass die Anschlagfläche (60) Teil einer Scheibe (6) ist, in welcher sich die Drosselöffnung (8) befindet.
- Steuereinrichtung nach einem der vorangehenden Ansprüche, dadurch gekennzeichnet, dass der Druckraum (5, 52, 53, ...), der zwischen Kolben (3, 32, 33, ...) und Anschlagfläche (60) angeordnet ist, eine Feder (11) enthält, durch welche der Kolben (3, 32, 33, ...) in die Schließstellung der steuerbaren Drossel (D1, D2, D3, ..) gedrängt wird.
- Steuereinrichtung nach Anspruch 1 oder 2, dadurch gekennzeichnet, daß der Kolben (3) an seinem Umfang mit größtem Durchmesser ein Dichtelement (4) trägt, das gleichzeitig als Lagerung des Kolbens in der Gehäusebohrung (1) wirksam ist.
- Steuereinrichtung nach Anspruch 1 oder 2, dadurch gekennzeichnet, dass die Drosselnadel (9) durch eine von außen aufbringbare Stellkraft in die Drosselöffnung (8) bewegbar ist.
- Steuereinrichtung nach einem der vorangehenden Ansprüche, dadurch gekennzeichnet, dass die Steuereinrichtung nach dem Prinzip der offenen Mitte arbeitet.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| PCT/EP2001/009264 WO2003014576A1 (de) | 2001-08-10 | 2001-08-10 | Steuereinrichtung für die kontinuierliche bewegung eines hydraulischen stellmotors |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| EP1415095A1 EP1415095A1 (de) | 2004-05-06 |
| EP1415095B1 true EP1415095B1 (de) | 2005-12-14 |
Family
ID=8164540
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| EP01974163A Expired - Lifetime EP1415095B1 (de) | 2001-08-10 | 2001-08-10 | Steuereinrichtung für die kontinuierliche bewegung eines hydraulischen stellmotors |
Country Status (5)
| Country | Link |
|---|---|
| US (1) | US7028599B2 (de) |
| EP (1) | EP1415095B1 (de) |
| AT (1) | ATE313016T1 (de) |
| DE (1) | DE50108414D1 (de) |
| WO (1) | WO2003014576A1 (de) |
Families Citing this family (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US8096227B2 (en) * | 2008-07-29 | 2012-01-17 | Caterpillar Inc. | Hydraulic system having regeneration modulation |
| US9328747B2 (en) * | 2013-03-15 | 2016-05-03 | Mts Systems Corporation | Servo actuator load vector generating system |
| US10281055B2 (en) * | 2016-02-09 | 2019-05-07 | Parker-Hannifin Corporation | Hydraulic servo valve |
| US10798866B2 (en) | 2018-08-10 | 2020-10-13 | Cnh Industrial America Llc | Depth control system for raising and lowering a work unit of an implement |
| US20230312239A1 (en) * | 2022-03-31 | 2023-10-05 | Oshkosh Corporation | Speed control for hydraulic system of a refuse vehicle |
Family Cites Families (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US2672731A (en) * | 1951-08-01 | 1954-03-23 | Electrol Inc | Self-contained power actuator |
| US3433131A (en) * | 1967-08-22 | 1969-03-18 | Ingebret Soyland | Control systems for hydraulic power units |
| ES480732A2 (es) * | 1978-05-20 | 1980-07-01 | Girling Ltd | Servo-amplificador de fuerza para sistema de frenos de vehi-culo. |
| US4201052A (en) * | 1979-03-26 | 1980-05-06 | Sperry Rand Corporation | Power transmission |
| US4437385A (en) * | 1982-04-01 | 1984-03-20 | Deere & Company | Electrohydraulic valve system |
| JP2532081B2 (ja) | 1987-01-30 | 1996-09-11 | 日産自動車株式会社 | パワ−ステアリングの油圧制御装置 |
| FR2715903B1 (fr) * | 1994-02-04 | 1996-05-03 | Alliedsignal Europ Services | Servomoteur d'assistance de freinage, à sécurité accrue. |
| FR2727922A1 (fr) * | 1994-12-09 | 1996-06-14 | Alliedsignal Europ Services | Servomoteur a enveloppe deformable |
| DE19500749C2 (de) | 1995-01-12 | 2000-12-07 | Danfoss As | Drei- oder Mehr-Wege-Ventil |
| DE19601662A1 (de) | 1996-01-18 | 1997-07-24 | Joerg J Prof Dipl Ing Linser | Servoventil in Kartuschenausführung, vorzugsweise für Hilfskraftlenkungen |
| US6691604B1 (en) * | 1999-09-28 | 2004-02-17 | Caterpillar Inc | Hydraulic system with an actuator having independent meter-in meter-out control |
-
2001
- 2001-08-10 DE DE50108414T patent/DE50108414D1/de not_active Expired - Lifetime
- 2001-08-10 EP EP01974163A patent/EP1415095B1/de not_active Expired - Lifetime
- 2001-08-10 US US10/486,483 patent/US7028599B2/en not_active Expired - Fee Related
- 2001-08-10 WO PCT/EP2001/009264 patent/WO2003014576A1/de not_active Ceased
- 2001-08-10 AT AT01974163T patent/ATE313016T1/de not_active IP Right Cessation
Also Published As
| Publication number | Publication date |
|---|---|
| EP1415095A1 (de) | 2004-05-06 |
| US7028599B2 (en) | 2006-04-18 |
| US20040187675A1 (en) | 2004-09-30 |
| DE50108414D1 (de) | 2006-01-19 |
| ATE313016T1 (de) | 2005-12-15 |
| WO2003014576A1 (de) | 2003-02-20 |
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