WO1996033346A1 - Ladeventilanordnung zum laden eines speichers - Google Patents
Ladeventilanordnung zum laden eines speichers Download PDFInfo
- Publication number
- WO1996033346A1 WO1996033346A1 PCT/EP1996/001245 EP9601245W WO9633346A1 WO 1996033346 A1 WO1996033346 A1 WO 1996033346A1 EP 9601245 W EP9601245 W EP 9601245W WO 9633346 A1 WO9633346 A1 WO 9633346A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- pressure
- pump
- arrangement according
- valve arrangement
- control line
- 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.)
- Ceased
Links
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 used, for example, for loading hydraulic accumulators with hydraulic fluid.
- FIG. 5 shows a circuit diagram of a conventional valve arrangement, which is operated as a charging valve for charging a reservoir with hydraulic fluid.
- the reference symbol S indicates the hydraulic accumulator, which is supplied with hydraulic fluid from the pump P via a throttle point D and a check valve RV.
- the reference symbol N indicates a consumer who can be supplied with hydraulic fluid via a switching valve SV.
- Hydraulic pressure is also applied to control line SL via throttle point D and control valve REV.
- the control valve REV is "clamped" by the hydraulic pressure in the control line SL.
- the control valve REV shown has three positions A, B, C. In Figure 5, the control valve REV is shown in position A. In this position A, the hydraulic pressure from the pump P is applied to the control line SL via the throttle point D. In position B all connections of the control valve REV are blocked and in position C the control line in the tank T is relieved.
- the control valve is clamped on both sides by the hydraulic pressure in the control line SL, the piston K1 on the right-hand side in FIG. 5, which wants to bring the control valve REV into the relief position C, having a smaller area than the counteract - de piston K2.
- Another piston K3 acts on the right side of the control valve REV and is acted upon by the pressure of the accumulator S. This also tries to move the control valve to the relief position C.
- a spring F acts on the left side of the control valve REV against this piston K3 and the piston Kl, the spring F being supported by the piston K2.
- the pressure line SiV to the left of the shuttle valve represents the signal pressure line of the consumer V.
- the loading process for the memory S is described below.
- the switching valve SV is only used to control the hydraulic flow to the consumer N and has no influence on the charging process.
- the switching valve SV is closed in the charging mode and thus remains without function with respect to the charging mode.
- the piston K2 compensates the piston K3.
- the piston K1 acts alone against the spring F.
- the pistons K1 and K2 are unloaded; the piston K3 then suddenly acts on the spring F, so that a switching jump occurs (force, travel, hysteresis).
- the control valve REV is in the position A shown.
- the accumulator V is fully charged in this position "slowly * 1 via the throttle point D and the check valve RV. Is a certain pressure in the accumulator S reached, the piston K1 puts the control valve REV in position B.
- pistons K2 and K3 compensate each other during charging, so that the control valve REV is brought into position B; Dynamics of the system also causes an intermediate position A / B.
- the pressure in the pistons Kl and K2 drops to the tank level, so that only the piston K3 is effective.
- the force jump on the piston causes the piston to jump away, a switching hysteresis of approximately 18% occurring.
- the pressure from which the control valve is moved can be adjusted via the spring F.
- position B the pressure already built up in the control line SL is maintained and the pump continues to deliver hydraulic fluid.
- the control valve REV is brought into the position C, in which the pressure from the control line is released into the tank. Due to the collapse of the pressure in the control line, the pump P receives a signal, when the boost pressure is the highest pressure in the charging valve arrangement, to throttle the delivery to idling.
- the control valve If the pressure in the accumulator S drops, the control valve is brought back into position C by the spring F. In this position, owing to the idling promotion, a pressure can build up in the control line SL, which, from a predetermined pressure, signals the pump to start up again to full delivery capacity. A short circuit at the control valve thus switches off the pump; whereas otherwise the pressure rises until the delta P of the control valve for pump delivery greater than zero is reached.
- this charging arrangement has certain disadvantages.
- the memory S is forwarded until the pump P is switched off. If loads in V are loaded higher than the cut-off pressure of the charging valve arrangement, the accumulators are charged up to this charging pressure. If the load pressure exceeds the maximum permissible accumulator pressure, the accumulator S or the valve is destroyed.
- the object of the invention is to provide a charging valve arrangement which reliably prevents overloading of the accumulator S and the valve, the housing of which usually consists of GG 30.
- the pump can be controlled via a control line.
- the pressure in the control line is controlled via a control valve which has a relief position in which the control line is released into a tank, so that the pressure in the control line breaks down and the pump accordingly receives a signal for throttling the delivery rate to idling, if the boost pressure or accumulator pressure is the highest pressure in the system at this time.
- the control valve can be provided with an additional intermediate position in which the control line is relieved into a tank via a throttle point. In this way, a more continuous control process is achieved.
- the control valve can limit the boost pressure in the valve to a set value.
- the control valve is preferably controlled by the accumulator pressure, which is counteracted by the force of a spring in the idle position, and the charging current increases during charging.
- the control valve can be clamped by means of the control pressure, the clamping being carried out in such a way that the spring is supported.
- the control line is connected either to the accumulator or to the pump, with the control line advantageously being supplied with fluid via a throttle point.
- the main valve which connects the reservoir to the pump or disconnects this connection, is controlled via the reservoir pressure.
- the force of a spring can counteract the accumulator pressure.
- the spring can also be supported by the control pressure in the control line.
- the pump can be controlled directly by the control line or a switching valve can be controlled via the control line, which is brought into a relief position when the pressure in the control line drops and in this position the pump connected to the pump for controlling it Line is relieved, so that the pump is controlled indirectly via the control line.
- a failure of the shuttle valve inevitably leads to the failure of a storage circuit, ie a brake circuit.
- the charging function is provided without problems even at very high pressures, and thus a safe shutdown is guaranteed in any case when the stores are loaded.
- a reliable function of the charging function is also ensured in the event that the pressure of consumers connected to it is higher than the memory pressure As is clear from the description of the exemplary embodiments, destruction of the accumulator or also of the charging valve is reliably precluded in this way.
- a particularly compact charging valve arrangement is obtained if the valve for separating the accumulator and part of the control line with throttle point are combined in one housing.
- the advantage here is that there is no high pressure in the housing.
- a corresponding integrated charging valve is described in detail in the description of the figures for FIG. 4.
- FIG. 1 shows the circuit diagram of a first exemplary embodiment.
- FIG. 2 shows the circuit diagram of a second exemplary embodiment.
- FIG. 3 shows the circuit diagram of a third exemplary embodiment.
- Figure 4 shows an integrated charging valve according to Figure 1 in cross section.
- Figure 5 shows the circuit diagram of a loading operation according to the prior art.
- the invention is explained below with reference to FIG. 1.
- the pump 1 conveys hydraulic fluid via a check valve 2 and a switching valve 3 in the open position 3A of the switching valve 3 into the reservoir 4.
- the check valve does not necessarily have to be present. With the use of the check valve, however, additional security is achieved in the event of failure of the pump drive and closed pump line or consumer.
- a further line leads from the pump 1 to consumers V. The load signaling of these consumers takes place via the line 8, which is shown on the right of the shuttle valve.
- the switching valve 3 is switched into the locked position 3B by means of the piston 7 against the force of the spring 5, and thus the accumulator is decoupled both from the pump 1 and from the consumer.
- the spring 5 is supported in this exemplary embodiment by a piston 6, which is controlled by the control line 9.
- the operation of the control valve 11 and thus the pressure build-up and reduction in the control line 9 is explained below.
- the pump l delivers via a
- Throttle 10 also in the control line 9, which clamps the control valve 11 in the manner shown, so that the position 11B of the control valve 11 is effected during loading, the piston area of the right piston 12 being larger than that of the left piston 13, so that pressure in the control line 9 supports the spring 14, which tries to bring the control valve 11 into the illustrated locked position 11A, in which the control valve ll will be located when loading the memory 4.
- the circuit diagram shown shows no direct coupling of the pistons 12 and 15 to the switching piston of the control valve II. In principle, the coupling can take place both directly and indirectly.
- the piston 13 is connected directly to the switching piston.
- the pistons 12 and 15 act against each other, the spring drawn on the piston 15 acting only as an auxiliary spring and being negligible in terms of force.
- the boost pressure PLS increases until the piston 13 shifts the switching piston of the control valve 11 to 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 displacement so that a stop disk does not come loose between the pistons.
- the spring 14 is counteracted by a piston 15 which is acted upon by the storage pressure and tries to bring the control valve 11 into the relief position 11C.
- an intermediate position IIB is provided, in which the control line is throttled and released into a tank 16.
- control line 9 In the position shown in FIG. 1 for loading the memory 4, the control line 9 is blocked by the control valve 11, so that a high pressure is built up in the control line 9 by the pump 1.
- the piston 13 brings the control valve 11 against the force of the spring 14 and the differential force of the pistons 15 and 12 into the relief position 11C.
- the control line 9 In this position 11C, the control line 9 is relieved of pressure in the tank 16, so that the pressure in the control line 9 and the line arm 9 1 breaks down.
- the pump 1 switches accordingly to idling.
- the idling is carried out via the regulating valve 11 into the tank 16. If the accumulator pressure drops, a force jump occurs at the switching piston and the regulating valve jumps to the throttled position 11b locked position 11A back. After a certain pressure has been built up, the control valve is brought into position IIB and controls the pressure build-up in it. As soon as the pump pressure is then greater than the storage pressure, the pump l pumps into the storage. The flow of the pump pe l depends on the pressure difference of Pp mpe " p S storage a -b- The pump pressure rises to PLS + delta pRegier-
- the switching valve 103 is arranged exactly as in the first exemplary embodiment; the way it works is also identical.
- the control line 109 is not supplied with fluid by the pump 101, but rather by the accumulator 104.
- the throttle 110 is not absolutely necessary and can also be omitted.
- control valve III is moved from the illustrated position IIIA, which permits pressure build-up in the control line 109, to the relief position IIIB, in which the control line 109 is released into the tank 116, from a specific storage pressure. Accordingly, the pressure in the line arm 109 'collapses and the pump 101 switches back to idling. As soon as the storage pressure drops below a predetermined pressure, the valves switch back to the positions shown and a pressure in the control line can build up again due to the idling promotion of the pump 101, so that the pump 101 is switched back to full delivery performance. is tested. In this embodiment, too
- the third exemplary embodiment according to FIG. 3 differs from the second exemplary embodiment only in that the pump regulator with the line arm 209 'is not controlled directly via the pressure in the control line 209, but rather with the pressure in the control line 209 an additional valve is controlled, which at a collapse of the pressure in the control line 209 relieves the pressure in the line arm 209 'or in the pump regulator and thus switches the pump 201 back to idling delivery.
- This structure has the advantage that no charging current flows and, furthermore, that the failure of the LS line has no influence on the memory or memories.
- the additional valve 217 shown has a throttled open position 217A and a relief position 217C. If, as in exemplary embodiment 2, the control valve 211 is brought into the relief position due to a high storage pressure, the additional valve 217 is brought into the relief position 217C by the force of the spring 218 and the line arm 209 "is relieved into a tank 219. The pump 201 is switched to idle promotion accordingly.
- 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 it is again, via the piston 220 Can build up pressure in line arm 209 ', whereby the pump is switched back to full delivery.
- the memory 204 is protected by the additional valve 217.
- the pressure of the pump P mpe may be higher and depends on the pressure of the consumer Pverb a ⁇ -
- FIG. 4 describes an integrated charging valve in which the circuit diagram according to FIG. 1 was implemented.
- the switching valve and part of the control line with throttle point are integrated in this charging valve.
- the charging valve has an outer housing part 21 which has a central inlet 22 for connecting the pump.
- An external control channel 24 on the circumference of an inserted sleeve 23 leads from this inlet 22 via the throttling points of a throttle chain 26 to the end of the charging valve opposite the outlet 25.
- the output 25 connected to the control channel 24 can be connected to the control line and is connected to the control valve II in the manner shown.
- four pockets are provided as the throttle chain 26, which form a throttle point in the control channel 24.
- a second channel 27 leads first through the central axis of the sleeve 23, possibly via a return valve, and then along its inner circumference between the sleeve 23 and a cylinder component 28.
- a piston 29 is displaceably mounted in the cylinder component 28 and is pushed by a spring 30 on the side of the outlet 25 in the direction of the inlet 22. In the position shown, the piston 29 is in its right-hand end position. In this position, the fluid in the channel 27 via holes 37 in the cylinder component 28 to grooves 31 on the circumference of the piston 29 and via these grooves 31 to the reservoir outlet 32.
- the reservoir outlet 32 is connected on the one hand to the fluid reservoir (not shown) and on the other hand to the control valve 11 in the manner shown for controlling the control valve 11.
- the grooves 31 do not extend over the entire length of the piston 29, but only over the region of the piston 29 shown in FIG. 4. That is, in the end position of the piston 29 shown, the grooves 31 extend from the radially inwardly directed connecting section 37 of the channel 27 straight to the memory outlet 32 in order to enable the connection of the channel 27 with the memory 32 in this position of the piston 29.
- the grooves 31 are further connected via bores 33 and 34 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 off from one another by means of seals 36.
- the piston 29 When loading the memory, the piston 29 is in the position shown. The fluid flows via the inlet 22 and the channel 27 through the grooves 31 of the piston 29 and the accumulator outlet 32 to the accumulator and to the control valve 11, respectively.
- the fluid flows throttled via the throttle chain 26 and the control channel 24 to the outlet 25. Since the control valve 11 is in the blocked position HA during the charging process, there is pressure in the control line and the pump delivers accordingly. In position IIB the piston limits the pressure. If the pressure in the accumulator rises, the pressure in the grooves 31 and thus in the space 35 on the piston crown also increases. The storage pressure is lower than the loading pressure Ls during charging. A "End of charge" the storage 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 safety even when the oil is dirty. The piston prevents the accumulator (s) from loading when the pressure Py rises. The switching valve 3 is switched off solely via the control valve II.
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- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Fluid Mechanics (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Fluid-Pressure Circuits (AREA)
- Filling Or Discharging Of Gas Storage Vessels (AREA)
- Supply Devices, Intensifiers, Converters, And Telemotors (AREA)
Abstract
Description
Claims
Priority Applications (4)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP8531436A JPH11509294A (ja) | 1995-04-21 | 1996-03-21 | 貯蔵器に充填する充填弁装置 |
| US08/952,712 US6000219A (en) | 1995-04-21 | 1996-03-21 | Charging valve arrangement to charge a store |
| EP96908107A EP0821765B1 (de) | 1995-04-21 | 1996-03-21 | Ladeventilanordnung zum laden eines speichers |
| DE59605549T DE59605549D1 (de) | 1995-04-21 | 1996-03-21 | Ladeventilanordnung zum laden eines speichers |
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE19514745A DE19514745A1 (de) | 1995-04-21 | 1995-04-21 | Ladeventilanordnung zum Laden eines Speichers |
| DE19514745.6 | 1995-04-21 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| WO1996033346A1 true WO1996033346A1 (de) | 1996-10-24 |
Family
ID=7760065
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| PCT/EP1996/001245 Ceased WO1996033346A1 (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) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE10128867B4 (de) * | 2001-06-15 | 2013-02-28 | Volkswagen Ag | Hydraulische Steuerungsvorrichtung |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE19930101A1 (de) * | 1999-07-01 | 2001-01-18 | Fluidtech Gmbh | Schaltvorrichtung für eine Arbeitsmaschine |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE3327978A1 (de) * | 1983-08-03 | 1985-02-21 | Mannesmann Rexroth GmbH, 8770 Lohr | Anordnung zum laden eines druckmittelspeichers |
| DE3426354A1 (de) * | 1983-08-03 | 1986-01-23 | 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 |
| WO1992012350A1 (de) * | 1991-01-04 | 1992-07-23 | Flutec Fluidtechnische Geräte Gmbh | Leckölfreies speicherladeventil |
Family Cites Families (8)
| 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 |
| 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 WO PCT/EP1996/001245 patent/WO1996033346A1/de not_active Ceased
- 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 DE DE59605549T patent/DE59605549D1/de not_active Expired - Lifetime
- 1996-03-21 US US08/952,712 patent/US6000219A/en not_active Expired - Lifetime
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE3327978A1 (de) * | 1983-08-03 | 1985-02-21 | Mannesmann Rexroth GmbH, 8770 Lohr | Anordnung zum laden eines druckmittelspeichers |
| DE3426354A1 (de) * | 1983-08-03 | 1986-01-23 | 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 |
| WO1992012350A1 (de) * | 1991-01-04 | 1992-07-23 | Flutec Fluidtechnische Geräte Gmbh | Leckölfreies speicherladeventil |
Non-Patent Citations (1)
| Title |
|---|
| "Grundlagen der hydraulischen Schaltungstechnik", OLHYDRAULIK UND PNEUMATIK, vol. 38, no. 3, 1 January 1994 (1994-01-01), pages 88, 90, 93, 94, XP000195285 * |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE10128867B4 (de) * | 2001-06-15 | 2013-02-28 | Volkswagen Ag | Hydraulische Steuerungsvorrichtung |
Also Published As
| Publication number | Publication date |
|---|---|
| EP0821765B1 (de) | 2000-07-05 |
| DE19514745A1 (de) | 1996-10-24 |
| EP0821765A1 (de) | 1998-02-04 |
| US6000219A (en) | 1999-12-14 |
| DE59605549D1 (de) | 2000-08-10 |
| JPH11509294A (ja) | 1999-08-17 |
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