WO2001086153A1 - Hydraulische steueranordnung - Google Patents
Hydraulische steueranordnung Download PDFInfo
- Publication number
- WO2001086153A1 WO2001086153A1 PCT/DE2001/001255 DE0101255W WO0186153A1 WO 2001086153 A1 WO2001086153 A1 WO 2001086153A1 DE 0101255 W DE0101255 W DE 0101255W WO 0186153 A1 WO0186153 A1 WO 0186153A1
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- WIPO (PCT)
- Prior art keywords
- valve
- pressure
- hydraulic
- control
- tank
- Prior art date
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Classifications
-
- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02F—DREDGING; SOIL-SHIFTING
- E02F9/00—Component parts of dredgers or soil-shifting machines, not restricted to one of the kinds covered by groups E02F3/00 - E02F7/00
- E02F9/20—Drives; Control devices
- E02F9/22—Hydraulic or pneumatic drives
- E02F9/2203—Arrangements for controlling the attitude of actuators, e.g. speed, floating function
- E02F9/2207—Arrangements for controlling the attitude of actuators, e.g. speed, floating function for reducing or compensating oscillations
-
- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02F—DREDGING; SOIL-SHIFTING
- E02F9/00—Component parts of dredgers or soil-shifting machines, not restricted to one of the kinds covered by groups E02F3/00 - E02F7/00
- E02F9/20—Drives; Control devices
- E02F9/22—Hydraulic or pneumatic drives
- E02F9/2217—Hydraulic or pneumatic drives with energy recovery arrangements, e.g. using accumulators, flywheels
-
- 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
Definitions
- the invention relates to a hydraulic control arrangement according to the preamble of patent claim 1.
- Such control arrangements are used, for example, as a stabilization module in wheel loaders in order to dampen the pitching vibrations that occur when driving.
- a stabilization module for wheel loaders is known, in which an extension arm is supported by hydrocyclic irides.
- the cylinder spaces of the hydraulic cylinders that are effective in the support direction are connected to a hydraulic accumulator.
- the rod-side annular spaces of the hydraulic cylinders are connected to the tank via a further logic valve.
- a valve arrangement is disposed with a logic valve which locks the 'connection between the hydraulic accumulator and the hydraulic cylinders in its closed position.
- An end face of a valve body of the logic valve that is effective in the closing direction can be relieved via an electrically operated directional control valve, so that the logic valve can be brought into its open position by the pressure in the hydraulic accumulator and in the cylinder spaces of the hydraulic cylinders that is effective in the opening direction.
- DE 39 09 205 Cl shows a hydraulic control arrangement in which the cylinder spaces of the hydraulic cylinders are connected to a hydraulic accumulator via an electrically actuated directional valve and the rod-side annular spaces of the hydraulic cylinders are connected to the tank in the driving state of a work machine.
- a pressure reducing valve is arranged between them and the hydraulic cylinders, by means of which the pressure in the hydraulic accumulator can be limited to a maximum value.
- a non-return valve is provided between the pressure reducing valve and the hydraulic accumulator, via which a discharge of the hydraulic accumulator via the pressure reducing valve is prevented.
- This pressure reducing valve is arranged in a filling line leading to the hydraulic reservoir, to which other consumers are also connected. With unfavorable operating conditions, it can happen that these other consumers generate pressure peaks which are passed on to the hydraulic accumulator due to a slow reaction of the pressure reducing valve. A reduction of these pressure peaks is not possible, so that damage to the hydraulic accumulators cannot be ruled out even with this construction.
- the object of the invention is to create a hydraulic control arrangement for damping driving vibrations of mobile work equipment, by means of which damage to a hydraulic accumulator can be prevented with minimal expenditure on device technology.
- a pressure relief valve is arranged in a line section between the hydraulic cylinders and the hydraulic accumulator, a non-return valve being connected upstream of the pressure limiting valve, as seen in the flow direction from the hydraulic cylinder to the hydraulic accumulator.
- Another advantage of the solution according to the invention is that compared to the construction described at the beginning tion the device-related effort is lower with superior function.
- the check valve according to the invention is preferably designed to be unlockable, the control pressure for unlocking being preferably tapped at the hydraulic cylinder or at the hydraulic accumulator. Tapping on the hydraulic accumulator has the advantage that, due to the higher pressure level, the gear ratio of the unlockable check valve can be selected to be lower.
- the damping valve arrangement according to the invention is advantageously implemented with a directional control valve via which, in the driving state, for example the rod-side annular space with a tank and / or the control connection of the check valve can be connected to one cylinder space (lifting cylinder bottom side) or the hydraulic accumulator.
- connection of the annular space of the hydraulic cylinder to the tank can alternatively also take place via a control valve or via another unlockable check valve.
- the control connection of the further unlockable check valve is pressurized with the same pressure as the first-mentioned check valve.
- the control valve on the one hand connects the annular space of the hydraulic cylinder to the tank and on the other hand also unlocks the non-return valve by mechanical or hydraulic coupling, so that the pressure accumulator is connected to one cylinder space of the hydraulic cylinder.
- a piston of the control valve also acts as an impact piston for the check valve, so that compared to conventional solutions, a separate push piston for the unlockable check valve can be saved.
- the operational safety of the hydraulic circuit is increased by the shut-off device being assigned to the directional control valve, via which it is switched back to its rest position when pressure peaks occur, so that the damping system can be practically overridden and damage to the hydraulic accumulator can be prevented.
- the damping valve arrangement is realized by a pressure control valve with a tank connection, a pressure connection connected to the pressure accumulator and an input connection connected to the cylinder chamber.
- the valve spool of the pressure control valve is acted upon by the pressure in the hydraulic accumulator on the one hand and by the force of a compression spring and the pressure in the first cylinder chamber on the other.
- the valve slide can be brought into a pressure-limiting position in which the pressure in the hydraulic accumulator can be limited to a maximum value.
- the pressure valve arrangement can be bypassed via a bypass line in which a manually operated shut-off valve is arranged.
- the hydraulic accumulator towards the tank can be relieved by opening this shut-off valve.
- the pressure control valve according to the invention is of particularly compact design if the piston slide is assigned a measuring piston supported on the housing, which is guided in the piston slide and can be acted upon with the pressure in the hydraulic accumulator on the face side.
- FIG. 1 shows a circuit diagram of a first exemplary embodiment of a control arrangement according to the invention
- FIG. 2 shows a section through an exemplary embodiment of a pressure limiting / pressure reducing valve of the damping valve arrangement from FIG. 1 /
- FIG. 5 a switching diagram of a variant of the exemplary embodiment shown in FIG. 3,
- FIG. 6 shows a circuit diagram of an exemplary embodiment that is simplified compared to the previously described solutions; and FIG. 7 shows a section through a directional valve, as can be used in the circuit diagrams according to FIGS. 1, 3, 4, 5 and 6.
- FIG. 1 shows a greatly simplified circuit diagram of a control arrangement for controlling a hydraulic cylinder supporting a boom of a mobile working device, for example a wheel loader, hereinafter referred to as lifting cylinder 2.
- This can be connected to a hydraulic pump 6 or a tank T via a charger control block 4 indicated by dash-dotted lines.
- the control arrangement shown has a damping valve arrangement 8, likewise indicated by dash-dotted lines, by means of which vibrations, for example pitching vibrations, which occur during the travel of the wheel loader are damped.
- This damping valve arrangement 8 is such designed that the lifting cylinder 2 is connected to a hydraulic accumulator 10 during the driving state, so that the lifting cylinder 2 is acted upon by the pressure in the hydraulic accumulator 10 in the supporting direction.
- the charger control block 4 has a pressure port P to which the hydraulic pump 6 is connected.
- Two working connections A, B of the loader control block 4 can be connected via the steaming valve arrangement 8 to a cylinder chamber 12 or an annular chamber 14 on the rod side of the hydraulic cylinder -2.
- the tank T is connected to a tank connection S.
- the loader control block 4 has a 4/3-way valve, an electrically actuable control valve 16 which, in its spring-loaded basic position, shuts off the work connections A, B from the pressure connection P and the tank connection S.
- a In a first switching position a, the pressure port P is connected to the working port B and the working port A is connected to the tank port S to extend the hydraulic cylinder 2, so that pressure medium is conveyed into the cylinder space 12 and from the annular space 14 to the tank T.
- the working port A In the further switching position b, the working port A is connected to the pressure port P and the tank port S is connected to the working port B to retract the hydraulic cylinder 2.
- the charger control block 4 has a pressure limiting valve 18, via which the working connection B can be connected to the tank connection S when a maximum pressure, for example 330 bar, is exceeded.
- the steaming valve arrangement 8 has two input connections R, U connected to the working connections A, B and two working connections A 'and B 1 and a tank connection T.
- the two input connections R, U are connected via channels 20, 22 to the input connections of an electrically operated 4/2 -Way valve 24 connected. This is biased by a compression spring into a basic position in which the channels 20, 22 are blocked.
- the directional control valve 24 can be brought into its second switching position, in which the channel 20 is connected to a tank channel 26 connected to the tank connection T and the channel 22 is connected to a control channel 28 indicated by dashed lines.
- the latter leads to the control connection of an unlockable check valve 30 which is arranged in a pressure channel 32 branching off from the channel 22.
- This leads to a pressure connection P 'to which the hydraulic accumulator 10 is connected.
- a control valve 34 with a pressure reducing and pressure limiting function is arranged, which will be described in more detail below.
- the control valve 34 is acted upon by a compression spring 36 and the pressure tapped from the control channel 28 via a branch channel 38 into its basic position shown and via the pressure acting in the hydraulic accumulator 10 in the opposite direction.
- This pressure is tapped via a control line 40 in the region of the pressure connection P ′ and is led to the end face of the valve spool which acts against the compression spring 36.
- the damping valve arrangement 8 is assigned a shut-off valve 42, which is arranged in a bypass line 44, via which the pressure connection P ′ can be connected to the tank channel 26 when the control valve 34 is bypassed.
- this check valve 42 is closed. It is assumed that when the wheel loader is started up, the bucket articulated on the boom rests on the ground. After starting the engine, the control valve 16 is brought into its switching position designated a, so that the cylinder space 12 of the lifting cylinder 2 is supplied with pressure medium via the pump 6, while the annular space 14 is connected to the tank T - the lifting cylinder 2 extends and the bucket is lifted off the ground.
- the pressure effective in the cylinder chamber 12 propagates through the pressure channel 32, the check valve 30 and the control valve 34 located in its illustrated basic position to the hydraulic accumulator 10.
- the carrying pressure of the lifting cylinder 2 is approximately 30 to 50 bar in the unloaded state, depending on the bucket weight. This pressure is then also present in the hydraulic accumulator 10.
- control valve 34 is shifted from its spring-biased basic position by the control pressure prevailing in the control line 40 into a control position pressure-reducing function in which the pressure led to the hydraulic accumulator 10 reaches a limit value, for example 120 bar is reduced.
- the effective control pressure in the branch channel 38 in the direction of the compression spring 36 is equal to the tank pressure, since the directional control valve 24 is still in its basic position shown.
- Control valve 34 are brought into a pressure-limiting position by the pressure in the control line 40, in which the hydraulic accumulator 10 is connected to the tank channel 26, so that a maximum pressure limitation of, for example, 150 bar is realized.
- the check valve 30 prevents the pressure in the hydraulic accumulator 10 from relaxing via the pressure channel 32.
- the control valve 16 is first brought into its central neutral position, in which the connections A, B and P, S are shut off from one another. Furthermore, the directional control valve 24 is switched over so that the annular space 14 of the lifting cylinder 2 is connected to the tank connection T. Furthermore, in this switching position of the directional control valve 24, the control channel 28 is connected to the channel 22 in which the pressure in the cylinder chamber 12 is present. By appropriately setting the transmission ratio of the check valve 30, this pressure in the control channel 28 is sufficient to unlock the check valve 30 so that the hydraulic accumulator 10 is connected to the cylinder chamber 12 via the control valve 34, the open check valve 30 and the pressure channel 32. the lifting cylinder 2 is held in its supporting position by the pressure in the accumulator 10.
- the control valve 34 is in its basic position shown. Since the hydraulic accumulator 10 is always pressurized when the system is switched on, a lowering of the boom is reliably prevented. Since the right end face of the valve spool of the control valve 34 is acted upon by the pressure present in the cylinder chamber 12, it is held in its basic position shown. Since the hydraulic accumulator 10 is always subjected to the same pressure when the system is switched on, the bucket is prevented from sagging.
- the pressure limiting function of the control valve 34 is assumed in the driving state by the pressure limiting valve 18, by means of which the pressure in the pressure channel 32 is limited. This pressure relief valve 18 is designed with a suction function.
- control valve 34 In the solution according to the invention, the pressure reducing and pressure limiting functions of the control valve 34 are combined in a single valve, the structure of which is described with reference to FIG. 2.
- FIG. 2 shows a longitudinal section through a preferred embodiment of the control valve 40 from FIG. 1, which is designed as a combined pressure reducing / pressure limiting valve.
- the control valve 34 has a valve housing 46 which is penetrated by a valve bore 48.
- a valve slide 50 is guided in the valve bore 48, which - in its basic position (not shown) via the compression spring 36 against 'one' Stop screw 52 is biased, which is screwed into the right end face portion of the valve bore 48 in FIG.
- the compression spring 36 is arranged in a spring space 56 which is radially enlarged with respect to the valve bore 48 and is supported on a connecting bush 54 which is penetrated by the control connection X and which is in the mouth region of the
- Spring chamber 56 or the valve bore 48 in the housing 46 is screwed in.
- the compression spring 36 engages the valve slide 50 via a spring plate 57.
- the latter In its central region, the latter has a plurality of pockets 58 distributed around the circumference, through the end faces of which two control edges 60 and 62 are formed.
- connection between a pressure space 64 opening in the pressure connection P and a storage space 66 opening in the storage connection A can be opened or closed.
- the connection between the storage space 66 and a tank space 68 opening in the tank connection T is opened or closed via the control edge 60.
- valve slide 50 is penetrated in the area of the web remaining between the pockets 58 by radial bores 70 which open into an axial blind hole 72 in which a volumetric piston 74 is guided.
- An end section of the measuring piston 74 protruding from the valve slide 50 is supported on the end face of the stop screw 52.
- pressure medium can enter from the storage space 66 via the radial bore 70 into the space delimited by the volumetric piston 74 and the axial blind bore 72, so that the valve slide 50 is acted upon by the pressure acting on the end face 76 of the axial blind bore 72 against the force of the compression spring 36.
- valve slide 50 In its spring-biased basic position, the valve slide 50 rests on the stop screw 52, so that the connection from the pressure connection P to the storage connection A is opened via the control edge 62, while the connection to the tank connection T is blocked. This corresponds to the first switching position of the control valve 34 shown in FIG. 1.
- the pressure in the hydraulic accumulator 10 is reported via the control connection X in the spring chamber 56, so that the pressure force component resulting from the pressure in the spring chamber 56 prestresses the valve slide 50 in addition to the force of the compression spring 36 in the closed position, while the resultant pressure force acting on the end face 76 acts on the valve slide 50 in the opposite direction.
- the space 78 remaining between the stop screw 52 and the end face of the valve slide 50 is connected to the tank connection T via a connection bore (not shown).
- the pressure connection P is connected to the pressure channel 32
- the storage connection A is connected to the hydraulic accumulator 10
- the tank connection T is connected to the tank channel 26, while the branch channel 38 opens into the control connection X.
- this branch channel 38 is connected to the tank connection T via the directional control valve 24, so that the tank pressure is present in the spring chamber 56.
- the control valve 16 For lifting the bucket, i.e. to extend the lifting cylinder 2, the control valve 16 is brought into the switching position a in the manner described above. Pressure medium flows through the pressure channel 32 to the pressure port P and from there via the open connection between the pressure chamber 64 and the storage chamber 66 to the hydraulic accumulator 10, so that it is extended as a function of the pressure on the lifting cylinder 2.
- This storage pressure is also in the axial blind bore 72, so that the
- Valve slide is acted upon by the resulting pressure force component in the opposite direction to the force of the compression spring 36.
- the accumulator pressure increases, so that, due to the pressure acting on the end face 76, the valve slide 50 counteracts the force of the compression spring 36 is shifted to the left so that the connection between the pressure chamber 64 and the storage chamber 66 is reduced via the control edge 62 - the control valve 34 is in its pressure reducing function.
- valve slide is brought to the left into the position shown in FIG. 2 by the increased accumulator pressure beyond the position described above, in which The connection between the storage space 66 and the tank space 68 is opened via the control edge 60 - the valve is in its pressure-limiting function, by means of which the maximum pressure of the hydraulic accumulator can be limited to a preset limit value, for example 150 bar.
- a preset limit value for example 150 bar.
- the directional control valve 24 When driving, the directional control valve 24 is switched so that a control pressure corresponding to the pressure in the cylinder chamber 12 is provided via the control channel 28 and the branch channel 38 is led to the control connection X.
- the valve spool when driving, the valve spool is moved back to its basic position by this control pressure and the force of the compression spring 36 against the compressive force resultant on the end face 76, in which the pressure chamber 64 is connected to the storage chamber 66 via the control edge 62 while the connection to the tank room 68 is blocked off via the control edge 60.
- control valve 34 can also be used in the variants of the system according to the invention described below.
- the directional control valve 24 is designed as a 4/2-way valve, the annular space 14 of the lifting cylinder 2 being connected to the tank channel 26 via the directional control valve 24 in the driving state.
- FIG. 3 shows a variant of the control arrangement according to the invention, in which the directional valve 24 is designed as a 3/2-way valve. In its spring-loaded basic position, this directional control valve 24 shuts off the channel 22 connected to the cylinder chamber 12 with respect to the tank channel 26 and the control channel 28. When driving, the directional valve 24 is switched so that the channel 22 is connected to the control channel 28 and the check valve 30 is unlocked. In this switching position of the directional control valve 24, the tank channel 26 is blocked.
- the annular space 14 of the lifting cylinder 2 is connected to the tank T via a control valve 80 of the loader control block 4.
- This control valve 80 is arranged in a tank line 82 which connects the channel 20 to the tank connection S.
- the tank line 82 is blocked.
- the control valve 80 is switched to the open position by means of a switching magnet, so that the connection between the annular space 14 and the tank T is opened.
- FIG. 3 corresponds to the exemplary embodiment explained with reference to FIG. 1, so that for the sake of simplicity reference is made to the relevant statements.
- FIG. 4 shows a further, simplified exemplary embodiment in which, similar to FIG. 3, the directional valve 24 is designed as a 3/2-way valve, via which the control channel 28 is connected to the tank channel 26 in the spring-loaded basic position.
- the channel 20 leading to the annular space 14 is connected to the tank channel via a further unlockable check valve 84.
- the pressure at the outlet of the directional control valve 24, i.e. the pressure in the control channel 28 can be tapped.
- the two check valves 30 and 84 are unlocked by switching the directional valve 24 by the pressure in the cylinder space 12 of the lifting cylinder 2.
- the hydraulic accumulator 10 with the. Cylinder chamber 12 and, on the other hand, annular chamber 14 of the lifting cylinder are connected to tank channel 26 via channel 20 and check valve 84.
- the further check valve 84 enables pressure medium to be sucked into the annular space 14.
- FIG. 4 corresponds to that from FIG. 1, so that further explanations are unnecessary.
- the pressure present in the cylinder space 12 of the lifting cylinder 2 is switched through. Under certain operating conditions, this pressure can be significantly lower than the pressure in the hydraulic accumulator 10 to which it was charged during the working cycle.
- the control valve 34 and the unlockable check valves 30 (84) must be designed with large pressure ratios, which in particular the unlockable check valves 30 and 84 can be built very large.
- FIG. 5 A variant is proposed in FIG. 5 in which the pressure transmission ratio can be set significantly lower than in the exemplary embodiments described above.
- the basic principle of the circuit explained in FIG. 5 corresponds to the exemplary embodiment explained with reference to FIG. 3 - in principle, however, the variant according to FIG. 5 can also be applied to the exemplary embodiments according to FIGS. 1 and 4.
- the annular space 14 of the lifting cylinder 2 is connected to the tank T during operation via a control valve 80.
- the check valve 30 is unlocked via the electrically actuated directional valve 24, which in the exemplary embodiment shown in FIG. 5 is also designed as a 3/2-way valve.
- the directional valve 24 connects the control channel 28 and the branch channel 38 to the tank channel 26.
- the connection to the tank channel 26 is closed and the control channel 28 and the branch channel 38 are connected to a storage line 88 which opens into the control line 40. That is, when the directional control valve 24 is switched, the pressure in the hydraulic accumulator 10 is switched into the control channel 28 via the control line 40 and the accumulator line 88, so that the check valve 30 is unlocked by the higher pressure of the hydraulic accumulator.
- the check valve 30 is thus unlocked by the same pressure which acts on the end face of the valve spool 50 of the control valve 34 which acts against the compression spring 36. Due to the higher control pressure, the pressure transmission ratio of the check valve 30 can be designed to be significantly lower.
- the annular space 14 of the hydraulic cylinder 2 is connected to the tank either via the directional control valve 24 or via the control valve 80 or the further unlockable check valve 84 during driving operation.
- the check valve 30 is unlocked by means of a control pressure which is tapped from the hydraulic accumulator 10 or from the cylinder chamber 12 of the hydraulic cylinder 2 via the directional valve 24. This control pressure acts on an impact piston, via which the check valve 30 can be brought into its open position.
- Figure 6 shows a circuit diagram of a simplified
- Embodiment in which this impact piston of the check valve 30 can be saved.
- the basic structure of the exemplary embodiment shown in FIG. 6 corresponds in principle to the circuit diagram of the embodiments explained with reference to FIGS. 3 and 5.
- the directional control valve 24 is in turn designed as a 3/2-way valve, the control channel 28 being connected to the tank channel 26 in the rest position of the directional control valve 24 and to the storage channel 88 in the switching position - ie when driving.
- the control valve 80 which can be actuated hydraulically in this case, is not arranged in the loader control block 4 as in the exemplary embodiments shown in FIGS. 3 and 5, but is part of the damping device.
- control valve 80 designed as a 2/2-way valve, is connected via a tappet 90 to the valve body 92 of the unlockable check valve 30, so that the switching movement of the control valve 80 is transmitted to the check valve 30 in order to bring it into its open position .
- This mechanical coupling between the control valve 80 and the check valve 30 means that the push-up piston required in the above-described exemplary embodiments can be saved.
- control valve 80 In the basic position shown, the control valve 80 is in its blocking position, via which the connection between the tank channel 26 and the annular space 14 of the lifting cylinder 2 is blocked.
- the end face of the piston of the control valve 80 which is effective in the opening direction is acted upon by the pressure in the control channel 28 via a control line 94, so that the tank pressure is present on this control face in the rest position of the directional control valve 24.
- control pressure corresponding to the pressure in the hydraulic accumulator 10 or in the cylinder chamber 12 is also applied via the control line 94 to the control surface of the piston control valve 80 which is effective in the opening direction, so that it is brought into its open position in which the annular space 14 of the lifting cylinder 2 with the Tank channel 26 is connected.
- the switching movement of the control valve 80 is transmitted via the plunger 90 to the valve body 92 of the check valve 30, so that this is brought into its open position in which the lifting cylinder 2 is supported by the pressure in the hydraulic accumulator 10.
- FIG. 7 shows a section through a valve arrangement 96, in which the control valve 80 and the check valve 30 are integrated.
- the valve arrangement 96 shown is received in a valve plate 98 in which two working connections A, B, a tank connection T opening vertically to the plane of the drawing and a storage connection P 'are formed.
- the working port A is connected to the cylinder space 12 via the pressure channel 32 and the working port B is connected to the annular space 14 of the lifting cylinder 2 via a working channel 100 (see FIG. 6).
- the hydraulic accumulator 10 is connected to the accumulator connection P '.
- valve plate 96 is penetrated in the transverse direction (FIG. 7) by a valve bore 102, in which the valve body 92 of the check valve 30 and a piston 104 of the control valve 80 are received.
- Annular spaces 106, 108, 110 and 112 are formed in the receiving bore 102, which are connected to the tank connection T, the Working connection B, the working connection A or the storage connection P 'are connected.
- the receiving bore 102 is blocked off at the end by a screw plug 114 and a guide bush 116 closed on one side, in which the piston 104 is guided.
- This guide bush 116 has a plurality of jacket openings 117, 119 opening in the area of the annular spaces 106, 108, so that the pressure medium can enter the interior 118 of the guide bush 116.
- two radially projecting ring collars 120, 122 are formed on the end face, which slide against the circumferential wall of the interior 118.
- the subspace of the inner space 118 adjoining the end face of the annular collar 122 is connected to the tank connection T and is therefore depressurized.
- a bush 124 is sealingly inserted, in which the plunger 90 is guided in a sliding manner.
- the receiving bore 102 has a valve seat 126 against which a conical end section of the valve body 92 designed as a hollow piston is prestressed by means of a closing spring 128.
- This closing spring 128 is supported on the locking screw 114 and engages on an inner annular end face of the valve body 92.
- the valve body 92 has a multiplicity of casing bores 130 executed.
- a spring chamber 132 for the closing spring 128 is connected to the accumulator connection P ′ via these jacket bores 130, so that the check valve is acted upon in the closing direction by the force of the closing spring 128 and the pressure in the hydraulic accumulator 10.
- the pressure in the annular space 110 which corresponds to the pressure in the cylinder space 12, acts on the valve body 92 in the opening direction.
- valve body 92 rests on the valve seat 126, so that the connection between the cylinder chamber 12 and the hydraulic accumulator 10 is shut off.
- the piston 104 is urged via the plunger 90 into its left end position, in which the annular collar 122 closes the jacket opening 119- while the jacket opening 117 is open, so that the annular space between the two annular collars 120 and 122 is subjected to tank pressure.
- a control port X which is connected via the control line 94 to the control channel 28 and thus to the output port of the directional control valve 24, opens into the pressure space adjoining the left end face of the piston 104. In the rest position of the directional control valve 24, the tank pressure is then present at this control connection X.
- the directional control valve 24 When the directional control valve 24 is switched by means of the electromagnet 96, the pressure at the hydraulic accumulator 10 (exemplary embodiment according to FIG. 6) or the pressure in the cylinder chamber 12 (exemplary embodiment according to FIG. 3) is present at the control connection X. Since the piston 104 has a larger end face than the end face of the valve body 92 which is effective in the opposite direction, the piston 104 is moved to the right in the illustration according to FIG. 7 by the control pressure applied to its left end face, so that the collar 122 opens the jacket opening 119 and thus the connection from the working connection B connected to the annular space 108 to the tank connection T opens.
- the axial displacement of the piston 104 is transmitted via the tappet 90 to the valve body 92 so that it is lifted from its valve seat 126 and the connection from the hydraulic accumulator 10 to the cylinder chamber 12 is opened - the lifting cylinder 2 is thus supported by the pressure in the hydraulic accumulator 10.
- FIG. 6 shows an optional further development of the damping valve device.
- a shutdown device 134 can be assigned to the directional valve 24.
- this switch-off device 134 is implemented by a switch-off piston 136, which acts in the same direction as the compression spring of the directional control valve 24 on its valve member.
- the back of the shut-off piston 136 is acted upon by the pressure in the pressure channel 32 via an actuating channel 138.
- the effective end face of the shut-off piston 136 is designed such that the directional valve 24 can be moved back into its rest position against the force of the energized electromagnet 96 when pressure peaks occur, so that the damping device is switched off and damage to the hydraulic accumulator 10 is prevented.
- This switch-off device can of course also be provided in the exemplary embodiments according to FIGS. 1-5.
- an electrical pressure shutdown can also be provided, via which the directional control valve 24 is returned to its rest position when a maximum pressure in the pressure channel 32 or on the hydraulic accumulator 10 is exceeded.
- a hydraulic control arrangement for damping driving vibrations of a mobile working device, with a lifting cylinder supporting a working tool, the cylinder spaces of which via a control valve arrangement can be connected to a pressure medium source or a tank.
- the hydraulic control arrangement also has a damping valve arrangement for connecting one cylinder space to a hydraulic accumulator and the other cylinder space to a tank.
- the steaming valve arrangement has a valve with a pressure-limiting function, which is arranged between a check valve and the hydraulic accumulator, so that the pressure in the hydraulic accumulator can be reliably limited to a maximum value.
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Abstract
Description
Claims
Priority Applications (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US10/276,044 US20040088972A1 (en) | 2000-05-11 | 2001-04-03 | Hydraulic control arrangement |
EP01929299A EP1281000A1 (de) | 2000-05-11 | 2001-04-03 | Hydraulische steueranordnung |
JP2001582726A JP2003532848A (ja) | 2000-05-11 | 2001-04-03 | 油圧式制御装置 |
Applications Claiming Priority (8)
Application Number | Priority Date | Filing Date | Title |
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DE10022910.7 | 2000-05-11 | ||
DE10022910 | 2000-05-11 | ||
DE10030327 | 2000-06-27 | ||
DE10030327.7 | 2000-06-27 | ||
DE10100235 | 2001-01-05 | ||
DE10100235.1 | 2001-01-05 | ||
DE10104298.1 | 2001-01-30 | ||
DE10104298A DE10104298A1 (de) | 2000-05-11 | 2001-01-30 | Hydraulische Steueranordnung |
Publications (1)
Publication Number | Publication Date |
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WO2001086153A1 true WO2001086153A1 (de) | 2001-11-15 |
Family
ID=27437815
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/DE2001/001255 WO2001086153A1 (de) | 2000-05-11 | 2001-04-03 | Hydraulische steueranordnung |
Country Status (3)
Country | Link |
---|---|
EP (1) | EP1281000A1 (de) |
JP (1) | JP2003532848A (de) |
WO (1) | WO2001086153A1 (de) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN111332266A (zh) * | 2020-03-31 | 2020-06-26 | 徐工集团工程机械股份有限公司科技分公司 | 电控制动液压系统及工程机械 |
Families Citing this family (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US6655136B2 (en) * | 2001-12-21 | 2003-12-02 | Caterpillar Inc | System and method for accumulating hydraulic fluid |
JP5368084B2 (ja) * | 2008-11-21 | 2013-12-18 | 国際計測器株式会社 | 振動試験装置 |
Citations (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE3909205C1 (de) * | 1989-03-21 | 1990-05-23 | Hanomag Ag, 3000 Hannover, De | |
EP0378129A1 (de) * | 1989-01-13 | 1990-07-18 | Hitachi Construction Machinery Co., Ltd. | Hydraulisches System für den Auslegerzylinder einer Konstruktionsmaschine |
DE19608758A1 (de) * | 1996-03-07 | 1997-09-11 | Rexroth Mannesmann Gmbh | Hydraulische Ventilanordnung |
DE19754828A1 (de) * | 1997-12-10 | 1999-06-24 | Mannesmann Rexroth Ag | Hydraulische Steueranordnung für eine mobile Arbeitsmaschine, insbesondere für einen Radlader, zur Dämpfung von Nickschwingungen |
US5992146A (en) * | 1996-04-12 | 1999-11-30 | Caterpillar Inc. | Variable rate ride control system |
-
2001
- 2001-04-03 JP JP2001582726A patent/JP2003532848A/ja active Pending
- 2001-04-03 WO PCT/DE2001/001255 patent/WO2001086153A1/de not_active Application Discontinuation
- 2001-04-03 EP EP01929299A patent/EP1281000A1/de not_active Withdrawn
Patent Citations (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP0378129A1 (de) * | 1989-01-13 | 1990-07-18 | Hitachi Construction Machinery Co., Ltd. | Hydraulisches System für den Auslegerzylinder einer Konstruktionsmaschine |
DE3909205C1 (de) * | 1989-03-21 | 1990-05-23 | Hanomag Ag, 3000 Hannover, De | |
DE19608758A1 (de) * | 1996-03-07 | 1997-09-11 | Rexroth Mannesmann Gmbh | Hydraulische Ventilanordnung |
US5992146A (en) * | 1996-04-12 | 1999-11-30 | Caterpillar Inc. | Variable rate ride control system |
DE19754828A1 (de) * | 1997-12-10 | 1999-06-24 | Mannesmann Rexroth Ag | Hydraulische Steueranordnung für eine mobile Arbeitsmaschine, insbesondere für einen Radlader, zur Dämpfung von Nickschwingungen |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN111332266A (zh) * | 2020-03-31 | 2020-06-26 | 徐工集团工程机械股份有限公司科技分公司 | 电控制动液压系统及工程机械 |
Also Published As
Publication number | Publication date |
---|---|
EP1281000A1 (de) | 2003-02-05 |
JP2003532848A (ja) | 2003-11-05 |
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