EP0821765B1 - Ladeventilanordnung zum laden eines speichers - Google Patents
Ladeventilanordnung zum laden eines speichers Download PDFInfo
- Publication number
- EP0821765B1 EP0821765B1 EP96908107A EP96908107A EP0821765B1 EP 0821765 B1 EP0821765 B1 EP 0821765B1 EP 96908107 A EP96908107 A EP 96908107A EP 96908107 A EP96908107 A EP 96908107A EP 0821765 B1 EP0821765 B1 EP 0821765B1
- Authority
- EP
- European Patent Office
- Prior art keywords
- pressure
- pump
- control
- valve
- reservoir
- 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
- 239000012530 fluid Substances 0.000 claims description 13
- 230000009467 reduction Effects 0.000 claims description 2
- 238000000926 separation method Methods 0.000 claims 1
- 230000015654 memory Effects 0.000 description 31
- 238000000034 method Methods 0.000 description 8
- 238000010586 diagram Methods 0.000 description 7
- 230000008569 process Effects 0.000 description 7
- 230000006870 function Effects 0.000 description 4
- 230000008901 benefit Effects 0.000 description 3
- 230000008878 coupling Effects 0.000 description 2
- 238000010168 coupling process Methods 0.000 description 2
- 238000005859 coupling reaction Methods 0.000 description 2
- 230000006378 damage Effects 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
- F15B1/00—Installations or systems with accumulators; Supply reservoir or sump assemblies
- F15B1/02—Installations or systems with accumulators
- F15B1/027—Installations or systems with accumulators having accumulator charging devices
Definitions
- the invention relates to a charging valve arrangement for charging a Memory.
- Generic loading valve arrangements are for example for loading hydraulic accumulators with hydraulic fluid used.
- FIG. 5 shows a circuit diagram of a conventional valve arrangement, which as a loading valve for loading a memory with Hydraulic fluid is operated.
- the reference symbol S gives the hydraulic accumulator, which from the pump P on a throttle point D and a check valve RV with hydraulic fluid is supplied.
- the reference symbol N gives one Consumer at a switching valve SV with hydraulic fluid can be supplied.
- Via the throttle point D and the control valve REV will also use the control line SL Hydraulic pressure applied.
- the control valve REV is through the hydraulic pressure in the control line SL "clamped".
- the shown control valve REV has three positions A, B, C.
- Figure 5 shows the control valve REV in position A. In this position A the hydraulic pressure from the pump P applied to the control line SL via the throttle point D. In position B all connections of the control valve are REV locked and in position C the control line relieved into the tank T.
- the control valve is on both sides clamped by the hydraulic pressure in the control line SL, wherein the piston K1 on the right in Figure 5, the move the control valve REV to the relief position C. wants to have a smaller area than the counteracting one Piston K2.
- On the right side of the REV control valve further acts another piston K3, with the pressure of the memory S is applied. So he tries also the control valve in the relief position C. bring. Counteracts this piston K3 and piston K1 a spring F on the left side of the control valve REV, where the spring F is supported by the piston K2.
- the pressure line SiV to the left of the shuttle valve provides the signal pressure line the consumer V.
- the loading process for the memory S is described below.
- the switching valve SV is only used for control of the hydraulic flow to the consumer N and has no influence on the charging process.
- the switching valve SV is in charging mode locked and thus remains without in terms of charging Function.
- the piston K2 compensates the piston during the charging process K3.
- the piston K1 alone acts against the spring F.
- the pistons K1 and K2 are relieved; the piston K3 then suddenly acts on the spring F, so that a switching step occurs (force, travel, hysteresis).
- a switching step occurs (force, travel, hysteresis).
- the memory S is empty or largely empty, there is the control valve REV in the position shown A.
- memory V becomes "slow” via the throttle point D and the check valve RV fully charged. Is a reached certain pressure in the accumulator S, the piston brings K1 the control valve REV in position B.
- pistons K2 and K3 compensate during charging, so that the control valve REV is set to position B.
- the pressure at which the control valve is moved can be adjusted via the Spring F can be adjusted. In position B the will pressure already built up in the control line SL and the pump continues to deliver hydraulic fluid. If the Pressure in storage S continues to increase, the control valve REV in brought the position C in which the pressure from the control line is relieved into the tank. By collapsing of the pressure in the control line, the pump P receives when the Boost pressure is the highest pressure in the charge valve assembly, a signal to reduce funding to idle funding.
- the object of the invention is to provide a charging valve arrangement create an overload of the memory S and the valve, whose housing usually consists of GG 30, sure prevented.
- the features of claim 1 firstly achieve that the memory when a limit pressure of the pump is disconnected, so that overloading in any case of the accumulator is safely excluded by means of the pump and second, that the load pressure of the consumer is not on can affect the memory. In this way, a loading valve assembly created with an effective storage backup, by means of overloading the accumulator and the valve itself can be safely excluded.
- the pump can be controlled via a control line.
- the pressure in the control line is controlled by a control valve controlled, which has a relief position, in which the control line is relieved into a tank, so that the pressure in the control line breaks down and the pump accordingly, a signal for throttling the delivery rate Idle promotion receives if the boost pressure or accumulator pressure is the highest pressure in the system at this time.
- the control valve can have an additional intermediate position be provided in the control line via a throttle is relieved into a tank. This way, a more continuous control process achieved.
- the control valve can limit the boost pressure in the valve to a set value.
- the control valve is preferably by the storage pressure controlled, in the idle position the power of a Counteracts spring.
- the charging current increases during charging.
- the control valve can use the control pressure be clamped, the clamping being carried out so that the Spring is supported.
- control line is either with the storage or the pump in connection, the control line advantageously via fluid is applied to a throttle point.
- the main valve that connects the accumulator to the pump or disconnects, is controlled by the memory pressure.
- the force of a spring can counteract the accumulator pressure Act.
- the spring can also be controlled by the control pressure in the Control line are supported.
- the pump can be controlled directly from the control line or a switching valve can be controlled via the control line be that when the pressure in the control line drops is brought into a relief position and in this position the line connected to the pump to control this relieved, so that the pump indirectly via the control line is controlled. If the memory pressure is directly Control of the pump used results in failure of the shuttle valve forced to failure of a memory circuit, so a brake circuit.
- the charging function is provided without any problems even at very high pressures and thus a safe shutdown is guaranteed in any case when the memories are loaded.
- a reliable function of the charging function is also ensured in the event that the pressure of adjacent consumers is higher than the storage pressure, which is clear from the description of the exemplary embodiments. In this way, destruction of the accumulator or the charging valve is reliably ruled out.
- a particularly compact loading valve arrangement is obtained if the valve to disconnect the memory and part of the Control line with throttle point combined in one housing become.
- the advantage is that no high pressure in Housing is present.
- a corresponding integrated charging valve is described in detail in the description of the figures for FIG. 4.
- Figure 1 shows the circuit diagram of a first embodiment.
- Figure 2 shows the circuit diagram of a second embodiment.
- Figure 3 shows the circuit diagram of a third embodiment.
- FIG. 4 shows an integrated charging valve according to FIG. 1 in the Cross-section.
- Figure 5 shows the circuit diagram of a charging operation according to the State of the art.
- the invention is explained below with reference to FIG. 1.
- the pump 1 delivers hydraulic fluid via a check valve 2 and a switching valve 3 in the open position 3A of the switching valve 3 in the memory 4.
- the check valve does not necessarily have to be present. With the stake the check valve will provide additional security if the pump drive fails and the pump line is closed or consumers achieved. One leads from pump 1 further line to consumers V. The load report this Consumer takes place via line 8, which is to the right of the shuttle valve is shown.
- the pump 1 delivers a Throttle 10 also in the control line 9, which is the control valve 11 clamped in the manner shown, so that when loading the position 11B of the control valve 11 is effected, the Piston area of the right piston 12 is larger than that of left piston 13 so that pressure in the control line 9 the Supported spring 14, which tries the control valve 11 in the to bring shown locked position 11A, in the the control valve 11 will be located when loading the memory 4.
- the circuit diagram shown is not a direct one Coupling of pistons 12 and 15 to the switching piston of the control valve 11 shows. Basically, the coupling can be both done directly as well as indirectly.
- the piston 13 is direct connected to the switching piston.
- the pistons 12 and 15 act against each other, the spring shown on the piston 15 only acts as an auxiliary spring and is negligible in terms of strength is.
- the boost pressure P LS increases until the piston 13 shifts the switching piston of the control valve 11 to FIG. 11B and the boost pressure is thus kept constant during charging.
- the pistons 12 and 15 act on the switching piston at the end of the charging process.
- the small auxiliary spring only causes a shift so that a stop disc does not come loose between the pistons.
- the spring 14 counteracts a piston 15 with the accumulator pressure is acted upon and tries the control valve 11th in the relief position 11C. Between the locked Position 11A and the relief position 11C is one Intermediate position 11B is provided in which the control line throttled in a tank 16 is relieved.
- the idling is carried out via the control valve 11 into the tank 16. If the accumulator pressure drops, a force jump occurs at the switching piston and the control valve jumps into the throttled position 11b locked position 11A back. After a certain pressure has been built up, the control valve is brought into position 11B and controls the pressure build-up in it. As soon as the pump pressure is then greater than the storage pressure, the pump 1 delivers into the storage. The flow rate of pump 1 depends on the pressure difference of the P pump - P accumulator . The pump pressure rises to P LS + delta P controller .
- the switching valve 103 arranged exactly as in the first embodiment; the way it works is also identical.
- the control line 109 is not from the pump 101 supplied with fluid, but from the memory 104.
- the accumulator pressure is via a throttle 110 and the control valve 111A on the control line 109 and thus applied to the line arm 109'd of the pump regulator.
- the throttle 110 is not absolutely necessary and can also be omitted.
- the third exemplary embodiment according to FIG. 3 differs from the second embodiment only in that the Pump regulator with line arm 209 'not directly over the Pressure in the control line 209 is controlled, but with the pressure in the control line 209 controlled an additional valve if the pressure in the control line collapses 209 the pressure in the line arm 209 'or in the pump regulator relieved and so switches the pump 201 back to idling.
- This structure has the advantage that no charging current flows and also that the failure of the LS line has no influence on the memory (s).
- the additional valve 217 shown has a throttled open Position 217A and a relief position 217C. Becomes as in embodiment 2, the control valve 211 due a high storage pressure brought into the relief position, so the auxiliary valve 217 is powered by the spring 218 in the relief position 217C and the line arm 209 'relieved into a tank 219. The pump 201 will accordingly switched to idle funding.
- the control valve 211 switches back to the open position 211A shown and pressure can build up again in the control line 209.
- the additional valve 217 is initially moved against the force of the spring 218 into the middle position 217A, in which pressure can also build up again in the line arm 209 ', as a result of which the pump is switched back to full delivery capacity.
- the memory 204 is protected by the additional valve 217.
- the pressure of the pump P pump may be higher and depends on the pressure of the consumer P Verb .
- FIG 4 describes an integrated charging valve in which the Circuit diagram according to Figure 1 was implemented.
- this loading valve are the switching valve and part of the control line integrated with throttle.
- the charging valve has an outer housing part 21, the one has central inlet 22 for connecting the pump. Of this inlet 22 leads to the throttling points of a throttle chain 26 an outer control channel 24 on the circumference of an inserted one Sleeve 23 to the end opposite the outlet 25 of the charging valve.
- the output connected to the control channel 24 25 is connectable to the control line and is in the shown manner connected to the control valve 11.
- the area of the control channel is four pockets as a choke chain 26 is provided, which has a throttle point in the control channel 24 form.
- a second channel 27 initially leads through the central axis the sleeve 23, if necessary, via a return valve and then on the inner periphery between the sleeve 23 and a cylinder member 28 along.
- a piston 29 is displaceably mounted in the cylinder component 28, that of a spring 30 on the exit 25 side is pushed towards the inlet 22.
- the piston 29 In the illustrated Position, the piston 29 is in its right-hand side End position. In this position, the fluid in channel 27 via holes 37 in the cylinder component 28 to grooves 31 on the circumference of the piston 29 passed and via these grooves 31 to the memory output 32.
- the memory output 32 is on the one hand with the Fluid storage (not shown) and on the other hand with the Control valve 11 in the manner shown to control the Control valve 11 connected.
- the grooves 31 do not extend over the entire length of the Piston 29, but only over that shown in Figure 4 Area of the piston 29. That is, in the end position shown of the piston 29, the grooves 31 extend from the radial inward connecting portion 37 of the channel 27 straight to memory output 32, in this position of the Piston 29 connects the channel 27 to the accumulator 32 to enable.
- the grooves 31 are also bores 33 and 34 connected to a space 35 on the piston crown of the piston 29.
- the housing part 21, the sleeve 23 and the cylinder component 28 are sealed against one another by means of seals 36.
- the piston 29 When loading the memory, the piston 29 is in the shown position. The fluid flows through the inlet 22 and the channel 27 through the grooves 31 of the piston 29 and the Storage outlet 32 to the storage or to the control valve 11.
- the accumulator pressure is less than the charge pressure Ls during charging. At the "end of charge” the accumulator pressure reaches almost the same level as the Ls pressure. Since the spring is very strong, the piston closes, relieving the Ls line in the tank 16. The spring ensures switching reliability even when the oil is dirty. The piston prevents the accumulator (s) from loading when the pressure P V rises.
- the switching valve 3 is controlled solely by the control valve 11.
Landscapes
- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Fluid Mechanics (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Fluid-Pressure Circuits (AREA)
Description
Claims (13)
- Ladeventilanordnung mit einem Schaltventil (3, 103, 203), das mit einer Pumpe (1, 101, 201) und einem Speicher (4, 104, 204) verbindbar ist und in einer ersten Stellung die Pumpe (1, 101, 201) mit dem Speicher(4, 104, 204) verbindet und in einer zweiten Stellung die Pumpe (1, 101, 201) von dem Speicher (4, 104, 204) trennt, wobei eine Trennung von Pumpe (1, 101, 201) und Speicher (4, 104, 204) ab einem bestimmten Speichergrenzdruck oder Ausgangsdruck des Bremssystems erfolgt und der Druck der Pumpe (1, 101, 201) und/oder der Druck des Speichers (4, 104, 204) an ein Regelventil (11, 111, 211) zur Regelung der Pumpe (1, 101, 201) anlegbar sind und ein angeschlossener Verbraucher vom Speicher (4, 104, 204) so trennbar ist, daß der Lastdruck des Verbrauchers nicht auf den Speicher (4, 104, 204) wirkt.
- Ladeventilanordnung nach Anspruch 1, dadurch gekennzeichnet, daß das Regelventil (11, 111, 211) eine erste Stellung aufweist, in der der Speicher (4, 104, 204) mit einer Steuerleitung zur Steuerung der Pumpe (1, 101, 201) verbunden ist und eine zweite Stellung, in der die Steuerleitung in einen Tank (16, 116, 216) entlastet wird.
- Ladeventilanordnung nach Anspruch 1, dadurch gekennzeichnet, daß die Pumpe (1, 101, 201) mit einer Steuerleitung verbindbar ist und das Regelventil (11, 111, 211) eine erste Stellung aufweist, in der die Steuerleitung gesperrt ist und eine zweite Stellung, in der die Steuerleitung in einen Tank (16, 116, 216) entlastet wird.
- Ladeventilanordnung nach einem der Ansprüche 2 bis 3, dadurch gekennzeichnet, daß das Regelventil (11, 111, 211) eine Zwischenstellung aufweist, in der die Steuerleitung über eine Drosselstelle in den Tank (16, 116, 216) entlastet wird, und daß die Steuerleitung über eine Drosselstelle mit dem Speicher (4, 104, 204) oder der Pumpe (1, 101, 201) verbindbar ist.
- Ladeventilanordnung nach einem der Ansprüche 2 bis 4, dadurch gekennzeichnet, daß das Regelventil (11, 111, 211) mittels des Druckes in der Steuerleitung eingespannt ist, wobei die auf das Regelventil (11, 111, 211) in Entlastungsrichtung wirkende Fläche geringer ist als die entgegengesetzt wirkende Fläche.
- Ladeventilanordnung nach einem der Ansprüche 1 bis 5, dadurch gekennzeichnet, daß das Regelventil (11, 111, 211) über den Speicherdruck angesteuert wird, dem die Kraft einer Feder entgegenwirkt.
- Ladeventilanordnung nach einem der Ansprüche 1 bis 6, dadurch gekennzeichnet, daß das Schaltventil (3, 103, 203) über den Speicherdruck angesteuert wird, dem die Kraft einer Feder entgegenwirkt, wobei die Feder das Schaltventil (3, 103, 203) in die erste Stellung drängt.
- Ladeventilanordnung nach Anspruch 7, dadurch gekennzeichnet, daß das Schaltventil (3, 103, 203) zusätzlich von dem Druck einer Steuerleitung angesteuert wird, der die Feder unterstützt.
- Ladeventilanordnung nach einem der Ansprüche 2 bis 8, dadurch gekennzeichnet, daß die Pumpe (1, 101, 201) über den Druck in der Steuerleitung steuerbar ist, und daß über den Druck der Steuerleitung ein Zusatzventil gesteuert wird, das bei Absinken des Drucks in der Steuerleitung in eine Entlastungsstellung gebracht wird, in der die mit der Pumpe (1, 101, 201) zur Steuerung dieser verbundene Leitung entlastet wird.
- Ladeventilanordnung nach einem der Ansprüche 1 bis 9, dadruch gekennzeichnet, daß das Gehäuse einen Anschluß für die Pumpe (1, 101, 201) und einen verschieblichen Kolben (29) aufweist, wobei das Fluid in einer ersten Stellung des Kolbens (29) vom Anschluß durch das Gehäuse über zumindest einen Kanal am Umfang des Kolbens (29) entlang zu einem Speicheranschluß strömen kann und in einer zweiten Stellung des Kolbens (29) die Verbindung vom Gehäuse zum Umfang des Kolbens (29) unterbrochen ist.
- Ladeventilanordnung nach Anspruch 10, dadurch gekennzeichnet, daß der Kolben (29) von einer Feder (30) in die erste Stellung belastet wird und mit einer Bohrung versehen ist, die den Kanal mit der der Feder (30) entgegengesetzten Stirnseite des Kolbens (29) verbindet.
- Ladeventilanordnung nach Anspruch 10 oder 11, dadurch gekennzeichnet, daß das Gehäuse einen Steuerkanal aufweist, der den Anschluß für die Pumpe (1, 101, 201) mit dem Anschluß für die Stuerleitung verbindet.
- Ladeventilanordnung nach Anspruch 12, dadurch gekennzeichnet, daß der Steuerkanal mit einer Drosselstelle versehen ist, daß die Drosselstelle durch eine Drosselkette (26) ausgebildet wird und daß die Drosselkette (26) durch vier erweiterte Räume ausgebildet wird.
Applications Claiming Priority (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE19514745A DE19514745A1 (de) | 1995-04-21 | 1995-04-21 | Ladeventilanordnung zum Laden eines Speichers |
DE19514745 | 1995-04-21 | ||
PCT/EP1996/001245 WO1996033346A1 (de) | 1995-04-21 | 1996-03-21 | Ladeventilanordnung zum laden eines speichers |
Publications (2)
Publication Number | Publication Date |
---|---|
EP0821765A1 EP0821765A1 (de) | 1998-02-04 |
EP0821765B1 true EP0821765B1 (de) | 2000-07-05 |
Family
ID=7760065
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP96908107A Expired - Lifetime EP0821765B1 (de) | 1995-04-21 | 1996-03-21 | Ladeventilanordnung zum laden eines speichers |
Country Status (5)
Country | Link |
---|---|
US (1) | US6000219A (de) |
EP (1) | EP0821765B1 (de) |
JP (1) | JPH11509294A (de) |
DE (2) | DE19514745A1 (de) |
WO (1) | WO1996033346A1 (de) |
Families Citing this family (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE19930101A1 (de) * | 1999-07-01 | 2001-01-18 | Fluidtech Gmbh | Schaltvorrichtung für eine Arbeitsmaschine |
DE10128867B4 (de) * | 2001-06-15 | 2013-02-28 | Volkswagen Ag | Hydraulische Steuerungsvorrichtung |
Family Cites Families (13)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE215129C (de) * | ||||
US2799995A (en) * | 1954-04-13 | 1957-07-23 | Vickers Inc | Power transmission |
DE2700058C2 (de) * | 1977-01-03 | 1987-05-07 | Alfred Teves Gmbh, 6000 Frankfurt | Ventilanordnung |
US4337620A (en) * | 1980-07-15 | 1982-07-06 | Eaton Corporation | Load sensing hydraulic system |
DE3034467A1 (de) * | 1980-09-12 | 1982-05-19 | Mannesmann Rexroth GmbH, 8770 Lohr | Hydraulische vorrichtung zum ueberwachen einer verbindung |
US4819430A (en) * | 1983-01-21 | 1989-04-11 | Hydreco, Inc. | Variably charged hydraulic circuit |
DD215129A1 (de) * | 1983-05-12 | 1984-10-31 | Orsta Hydraulik Veb K | Leistungsgeregelte druckspeichersysteme fuer hydraulische antriebe |
DE3426354A1 (de) * | 1983-08-03 | 1986-01-23 | Mannesmann Rexroth GmbH, 8770 Lohr | Anordnung zum laden eines druckmittelspeichers |
DE3327978A1 (de) * | 1983-08-03 | 1985-02-21 | Mannesmann Rexroth GmbH, 8770 Lohr | Anordnung zum laden eines druckmittelspeichers |
DE3501660A1 (de) * | 1985-01-19 | 1986-07-24 | Alfred Teves Gmbh, 6000 Frankfurt | Hydraulische anlage |
DE8533311U1 (de) * | 1985-11-27 | 1986-10-23 | Integral Hydraulik & Co, 4000 Düsseldorf | Speicherladeventil |
DE4100071A1 (de) * | 1991-01-04 | 1992-07-09 | Fluidtech Gmbh | Leckoelfreies speicherladeventil |
DE9200009U1 (de) * | 1991-01-16 | 1992-03-19 | Hauhinco Maschinenfabrik G. Hausherr, Jochums GmbH & Co KG, 4322 Sprockhövel | Steuereinrichtung zum Betrieb einer Rangieranlage im Eisenbahnverkehr |
-
1995
- 1995-04-21 DE DE19514745A patent/DE19514745A1/de not_active Withdrawn
-
1996
- 1996-03-21 JP JP8531436A patent/JPH11509294A/ja active Pending
- 1996-03-21 EP EP96908107A patent/EP0821765B1/de not_active Expired - Lifetime
- 1996-03-21 US US08/952,712 patent/US6000219A/en not_active Expired - Lifetime
- 1996-03-21 DE DE59605549T patent/DE59605549D1/de not_active Expired - Lifetime
- 1996-03-21 WO PCT/EP1996/001245 patent/WO1996033346A1/de active IP Right Grant
Also Published As
Publication number | Publication date |
---|---|
EP0821765A1 (de) | 1998-02-04 |
US6000219A (en) | 1999-12-14 |
JPH11509294A (ja) | 1999-08-17 |
DE59605549D1 (de) | 2000-08-10 |
DE19514745A1 (de) | 1996-10-24 |
WO1996033346A1 (de) | 1996-10-24 |
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