EP2657178A2 - Installation hydraulique d'une machine de travail mobile - Google Patents

Installation hydraulique d'une machine de travail mobile Download PDF

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Publication number
EP2657178A2
EP2657178A2 EP20130162479 EP13162479A EP2657178A2 EP 2657178 A2 EP2657178 A2 EP 2657178A2 EP 20130162479 EP20130162479 EP 20130162479 EP 13162479 A EP13162479 A EP 13162479A EP 2657178 A2 EP2657178 A2 EP 2657178A2
Authority
EP
European Patent Office
Prior art keywords
control
valve
working hydraulics
pump
hydraulic system
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.)
Granted
Application number
EP20130162479
Other languages
German (de)
English (en)
Other versions
EP2657178B1 (fr
EP2657178A3 (fr
EP2657178B9 (fr
Inventor
Clayton Greenman
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Linde Material Handling GmbH
Original Assignee
Linde Material Handling GmbH
Priority date (The priority date 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 date listed.)
Filing date
Publication date
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Publication of EP2657178A2 publication Critical patent/EP2657178A2/fr
Publication of EP2657178A3 publication Critical patent/EP2657178A3/fr
Publication of EP2657178B1 publication Critical patent/EP2657178B1/fr
Application granted granted Critical
Publication of EP2657178B9 publication Critical patent/EP2657178B9/fr
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Anticipated expiration legal-status Critical

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B66—HOISTING; LIFTING; HAULING
    • B66F—HOISTING, LIFTING, HAULING OR PUSHING, NOT OTHERWISE PROVIDED FOR, e.g. DEVICES WHICH APPLY A LIFTING OR PUSHING FORCE DIRECTLY TO THE SURFACE OF A LOAD
    • B66F9/00—Devices for lifting or lowering bulky or heavy goods for loading or unloading purposes
    • B66F9/06—Devices for lifting or lowering bulky or heavy goods for loading or unloading purposes movable, with their loads, on wheels or the like, e.g. fork-lift trucks
    • B66F9/075—Constructional features or details
    • B66F9/20—Means for actuating or controlling masts, platforms, or forks
    • B66F9/22—Hydraulic devices or systems
    • 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
    • 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
    • E02F9/2221—Control of flow rate; Load sensing arrangements
    • E02F9/2225—Control of flow rate; Load sensing arrangements using pressure-compensating valves
    • 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
    • E02F9/225—Control of steering, e.g. for hydraulic motors driving the vehicle tracks
    • 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
    • E02F9/226—Safety arrangements, e.g. hydraulic driven fans, preventing cavitation, leakage, overheating
    • 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
    • E02F9/2278—Hydraulic circuits
    • E02F9/2285—Pilot-operated systems
    • 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
    • E02F9/2278—Hydraulic circuits
    • E02F9/2292—Systems with two or more pumps
    • 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
    • E02F9/2278—Hydraulic circuits
    • E02F9/2296—Systems with a variable displacement pump
    • 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
    • F15B11/16—Servomotor systems without provision for follow-up action; Circuits therefor with two or more servomotors
    • F15B11/161—Servomotor systems without provision for follow-up action; Circuits therefor with two or more servomotors with sensing of servomotor demand or load
    • F15B11/162—Servomotor systems without provision for follow-up action; Circuits therefor with two or more servomotors with sensing of servomotor demand or load for giving priority to particular servomotors or users
    • 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
    • F15B2211/20—Fluid pressure source, e.g. accumulator or variable axial piston pump
    • F15B2211/205—Systems with pumps
    • F15B2211/2053—Type of pump
    • F15B2211/20546—Type of pump variable capacity
    • F15B2211/20553—Type of pump variable capacity with pilot circuit, e.g. for controlling a swash plate
    • 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
    • F15B2211/20—Fluid pressure source, e.g. accumulator or variable axial piston pump
    • F15B2211/205—Systems with pumps
    • F15B2211/20576—Systems with pumps with multiple pumps
    • 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
    • F15B2211/40—Flow control
    • F15B2211/405—Flow control characterised by the type of flow control means or valve
    • F15B2211/40523—Flow control characterised by the type of flow control means or valve with flow dividers
    • F15B2211/4053—Flow control characterised by the type of flow control means or valve with flow dividers using 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
    • F15B2211/40—Flow control
    • F15B2211/41—Flow control characterised by the positions of the valve element
    • F15B2211/411—Flow control characterised by the positions of the valve element the positions being discrete
    • 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
    • F15B2211/40—Flow control
    • F15B2211/415—Flow control characterised by the connections of the flow control means in the circuit
    • F15B2211/41509—Flow control characterised by the connections of the flow control means in the circuit being connected to a pressure source and a directional control valve
    • 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
    • F15B2211/40—Flow control
    • F15B2211/42—Flow control characterised by the type of actuation
    • F15B2211/428—Flow 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
    • F15B2211/60—Circuit components or control therefor
    • F15B2211/625—Accumulators
    • 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
    • F15B2211/60—Circuit components or control therefor
    • F15B2211/635—Circuits providing pilot pressure to pilot pressure-controlled fluid circuit elements
    • 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
    • F15B2211/70—Output members, e.g. hydraulic motors or cylinders or control therefor
    • F15B2211/71—Multiple output members, e.g. multiple hydraulic motors or cylinders
    • F15B2211/7142—Multiple output members, e.g. multiple hydraulic motors or cylinders the output members being arranged in multiple groups
    • 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
    • F15B2211/80—Other types of control related to particular problems or conditions
    • F15B2211/85—Control during special operating conditions

Definitions

  • the invention relates to a hydraulic system of a mobile work machine, in particular an industrial truck, with a pump for common supply of a hydraulic steering device and a comprehensive at least one consumer working hydraulics, wherein a priority valve for preferential supply of the steering device is arranged in a delivery line of the pump, by means of a delivery branch line communicates with the steering device and with a delivery branch line to the working hydraulics.
  • a pump In mobile machines, such as industrial trucks, a pump is used to jointly supply a hydraulic steering device and a working hydraulics, which usually includes several consumers.
  • a priority valve is arranged in the delivery line of the pump.
  • the priority valve is in this case via a delivery branch line with the steering device and via a further delivery branch line with the working hydraulics in combination. If the pump in the sole operation of the steering device and non-driven consumers of the working hydraulics provides a need for the steering device excess flow delivers, it can flow through the priority valve connected to the working hydraulics prinzweig réelle and to an undesirable operation of the load of the working hydraulics and thus lead to an undesired movement of a load handled by the consumers.
  • the present invention has for its object to provide a hydraulic system available, can be effectively prevented with the unwanted consumer movements of the working hydraulics.
  • the safety device comprises a arranged in the run to the working hydraulic prinzweig effet shut-off valve device which is controlled in non-actuated consumers of the working hydraulics in a locked position and in a control of the load of the working hydraulics in an open position aufberichtbar.
  • a shut-off valve device according to the invention which is arranged in the conveying branch line arranged from the priority valve to the working hydraulics, undesired consumer movements of the working hydraulics can be avoided in a simple and effective manner.
  • the shut-off valve device is in a blocking position and blocks the connection of the pump to the working hydraulics. In this way it is achieved that in a sole actuation of the steering device by the shut-off by means of the shut-off valve branch line unwanted movements of the consumers of the working hydraulics by a need of the steering device excess, excess flow of the pump can be prevented.
  • the shut-off valve device is designed as a pilot-operated shut-off valve, wherein acting in the direction of the blocking position control pressure chamber of the shut-off valve by means of a pilot valve at non-driven consumers of the working hydraulics of the pending in the delivery branch line delivery pressure of the pump and a control of the consumer Working hydraulics can be relieved to a container.
  • acting on acting in the direction of the blocking position control pressure chamber of the check valve of the pending in the delivery branch line pressure is achieved in a simple manner that the check valve is acted upon sole operation of the steering hydraulics and non-driven consumers of the working hydraulics in the blocking position and shuts off the delivery branch line.
  • By relieving the pressure acting in the direction of the blocking position control pressure chamber of the check valve can be controlled by the pending in the delivery branch line delivery pressure of the pump in a flow position in a simple way when controlling the load of the working hydraulics, the check valve.
  • the pilot valve has a first control position, in which the control pressure chamber of the check valve is connected to the delivery branch line, and a second control position, in which the control pressure chamber is connected to the container, wherein the pilot valve is acted upon by means of a spring device in the first control position and can be acted upon by means of an actuating device in the second control position.
  • the pilot valve can be operated in the second control position by controlling the actuator of the pilot valve in a simple manner to lange jury excusen by relieving the control pressure chamber to the container the check valve.
  • the actuating device of the pilot valve can be designed as a solenoid according to one embodiment of the invention.
  • the actuating device is designed as a control pressure surface, which communicates with a control pressure leading control pressure supply line.
  • the safety device comprises a safety valve, by means of which the control pressure surface leading to the control pressure surface is relieved to a container at non-controlled consumers of the working hydraulics and the control pressure supply line to a control pressure source is connected to a control of the consumers of the working hydraulics.
  • control pressure supply line can be acted upon by the control pressure generated by the control pressure source, so that the pilot valve is acted upon in the second control position to bachelorêtn the shut-off valve device in the open position.
  • the further safety valve is arranged in the control pressure supply line, wherein the safety valve has a first control position in which the control pressure supply line is relieved to a container and has a second control position in which the control pressure supply line is connected to the control pressure source, wherein the safety valve by means of a spring device in the first control position is acted upon and by means of an electrical actuating device, in particular a solenoid, in the second control position can be acted upon.
  • an electrical actuating device in particular a solenoid
  • a control valve throttling in intermediate positions is provided for the actuation of each consumer of the working hydraulics, which control valve can be actuated by means of a control device connected to the control pressure supply line.
  • the pump is designed as adjustable in the flow rate pump, wherein the flow rate of the pump is controlled by means of a control device controlling control valve device which is controlled by a load pressure signal of the steering device or the working hydraulics, wherein the safety device comprises a further safety valve ,
  • a control device controlling control valve device which is controlled by a load pressure signal of the steering device or the working hydraulics
  • the safety device comprises a further safety valve
  • Such a load-sensing-controlled pump increases at a pending in the load pressure signal line load pressure signal at a control of the steering device and / or the control of a consumer of the working hydraulic flow rate to produce in the delivery line a delivery pressure to a predetermined control pressure difference higher than the Load pressure of the consumer is.
  • the further safety valve is arranged in a guided from the load pressure signal line to a container branch line and has a flow position and a blocking position, wherein the safety valve is acted upon by a spring means in the flow position and by means of an electrical actuator, in particular a solenoid in the blocking position can be acted upon.
  • a further pump is provided for additional supply to the consumer of the working hydraulics, which is designed as adjustable in the flow rate pump, the flow rate of the pump is controlled by means of a control device controlling control valve device controlled by a load pressure signal of the working hydraulics is, wherein the safety device comprises an additional safety valve, by means of which a load pressure signal leading load pressure signal line is relieved at non-actuated consumers of the working hydraulics and when driving the load of the working hydraulics the pending in the load pressure signal line load pressure signal is passed to the control valve means of the other pump.
  • the additional safety valve is expediently arranged in a branch line guided from the load pressure signal line to a container and has a flow position and a blocking position, wherein the additional safety valve is acted upon by a spring device in the flow position and by means of an electrical actuator, in particular a solenoid in the Lock position can be acted upon.
  • a safety valve is achieved in a simple manner, which is relieved in the de-energized state, the load pressure signal line to the container.
  • a high reliability of the hydraulic system according to the invention is further achieved, since in the de-energized state of the safety valve by relieving the control valve to the further pump designed as a further pump an increase in the flow rate The pump is prevented and thus unwanted movements of the consumers of the working hydraulics are made impossible.
  • an electronic control device for controlling the safety device, which is for determining the actuation of the steering device with a steering sensor device of the steering device in combination.
  • the safety valve can be controlled in an easy manner upon actuation of the steering device to by supplying the control device of the steering device and the working hydraulics pump by the load pressure of the actuated steering device to achieve a corresponding control of the pump to increase the flow rate.
  • the electronic control device determines, based on electrical control signals of the control valves of the working hydraulics, a control of the consumers of the working hydraulics.
  • a control of the consumers of the working hydraulics On the basis of the electrical control signals of the control valves can be determined by the electronic control device in a simple manner, a desired actuation of the load of the working hydraulics to allow by a corresponding control of the safety device, the desired actuation of the consumer.
  • FIG. 1 is a hydraulic circuit diagram of a hydraulic system according to the invention shown a mobile machine, such as an industrial truck.
  • the hydraulic system comprises a hydraulic steering hydraulic system L and a working hydraulic system A, which as a rule comprises several consumers. In the illustrated embodiment, only one consumer of the working hydraulics A is shown.
  • the hydraulic system has two pumps 1, 101.
  • the pump 1 is provided for the common supply of the steering hydraulic L and the working hydraulics A.
  • the pump 101 supplies only the working hydraulics A with pressure medium.
  • the pumps 1, 101 are driven by a non-illustrated drive machine, for example, designed as a diesel engine internal combustion engine.
  • the pumps 1, 101 are in each case designed as pumps which are adjustable in the delivery volume or the delivery quantity and which are operated in the open circuit in the illustrated embodiment and are in communication with a container 2 on the input side.
  • the pump 1 delivers into a delivery line 3 and the pump 101 into a delivery line 103, which are connected to corresponding consumers.
  • a control valve 5, 105 throttling in intermediate positions is provided in each case.
  • the control valve 5 for controlling the hydraulic steering device L is designed, for example, as Lenkorbitrol, which is actuated by means of a steering wheel 5a.
  • the control valves 105 for controlling the consumers of the working hydraulics A are designed as directional control valves.
  • the control valves 5, 105 each have a neutral position in which the consumer lines routed to the consumers are shut off.
  • the control valves 5, 105 have, in corresponding control positions, an orifice plate formed by the opening width and thus the released opening cross-section.
  • pressure compensators DW can be arranged downstream or upstream of the metering orifice on the control valves 5, 105.
  • the control valves 105 of the working hydraulics A are electro-hydraulically actuated.
  • electrically actuated pilot valves 110a, 110b are provided as drive means 110 which are connected on the input side to a control pressure supply line 120 and generate a hydraulic actuation pressure for actuating the control valve 105 when driven from a pending in the control pressure supply line 120 control pressure ,
  • the control pressure supply line 120 communicates with a control pressure source 121 which is constituted by a control pressure pump 122.
  • the control pressure source 121 further includes a pressure medium reservoir 123, which is associated with the control pressure supply line 120.
  • a priority valve P is arranged for the preferred supply of the steering device L with pressure medium. From the priority valve P is a delivery branch line 3a to the control valve 5 of the steering device L and a delivery branch line 3b to the control valves 105 of the working hydraulics A out.
  • the delivery line 103 of the pump 101 is guided to the control valves 105 of the load of the working hydraulics.
  • the pumps 1, 101 designed as variable-displacement pumps are each designed as a load-sensing controlled pump and provided with a control valve device 6, 106, for example a demand flow control valve, which is controlled by one of the delivery pressure signal of the pump 1 or 101 and the highest load pressure signal Consumer formed signal difference is controlled.
  • a control valve device 6, 106 for example a demand flow control valve, which is controlled by one of the delivery pressure signal of the pump 1 or 101 and the highest load pressure signal Consumer formed signal difference is controlled.
  • the control valve device 6, 106 actuates an adjusting device 7, 107 formed by an actuating piston device, by means of which a delivery volume adjusting device 8, 108 controlling the delivery volume of the pump 1, 101 can be actuated, for example an inclination adjustable swash plate of a pump 1, 101 designed as a swash plate pump is adjustable.
  • the adjusting device 7, 107 is acted upon by means of a - for example, designed as a spring device - control device in the direction of a maximum delivery volume and thus in the direction of increasing the delivery volume of the pump 1, 101.
  • a control pressure space acting in the direction of an increase of the adjusting device 7, 107, in which the spring device is arranged, can be connected to a delivery side of the pump 1, 101.
  • a second control pressure chamber counteracting the control pressure chamber with the spring device is formed on the adjusting device 7, 107.
  • This second control pressure chamber communicates with a control line 10, 110, which is guided to the control valve device 6, 106.
  • the control valve device 6, 106 is formed in the illustrated embodiment as a load-sensing control valve or demand flow control valve in a first control position, the control line 10, 110 to increase the flow rate of the pump 1, 101 with a leading container 2 to the container 11, 111 combines. In a second control position for reducing the delivery rate of the pump 1, 101, the control valve device 6, 106 connects the control line 10, 110 with the delivery side of the pump 1, 101.
  • the control valve device 6, 106 is acted upon by a in a delivery pressure signal line 50 and 51 pending delivery pressure signal of the pump 1, 101 in the direction of the second control position. In the direction of the first control position, the control valve device 6, 106 is acted upon by a control spring 15, 115, whose bias corresponds to a set control pressure difference, and the highest load pressure of the driven consumers acted upon.
  • the tap of the control valve means 6, 106 actuated load pressure of the driven consumer takes place in the region of the control valves 5, 105.
  • the load pressure signal line 21 of the working hydraulics A in which is present at a control of one or more consumers of the working hydraulics A, the highest load pressure of the driven consumer is guided to the control valve means 106 of the pump 101 to the admission.
  • a selector valve means 45 is provided, for example, a shuttle valve, the input side with the load pressure signal line 20 of the steering device L and the load pressure signal line 21 of the working hydraulics A is in communication and at the output of a load pressure signal line 22 is connected, which is guided to the control valve device 6 of the pump 1 to the admission.
  • the hydraulic system according to the invention has a safety device S, which avoids and prevents unwanted actuation of the consumers of the working hydraulics.
  • the safety device S comprises a shut-off valve device 130 arranged in the conveying branch line 3b.
  • the shut-off valve device 130 is controlled in non-activated consumers of the working hydraulics A or on sole actuation of the steering hydraulics L and non-actuated consumers of the working hydraulics A into a blocking position in order to shut off the conveying branch line 3b to prevent inadvertent actuation of the consumers of the working hydraulics A by the pump 1.
  • the shut-off valve device 130 can be opened in an open position in order to achieve a supply of the consumers via the pump 1.
  • the shut-off valve device 130 is designed as a pilot-operated shut-off valve 131, which - as in connection with the Figures 2 and 3 is apparent - is acted upon by means of acting in the direction of a blocking position control pressure chamber 132 in the blocking position.
  • a blocking position control pressure chamber 132 In the control pressure chamber 132 may continue in a blocking position acting spring device 133 may be arranged. Acting in the direction of the blocking position control pressure chamber 132 of the check valve 130 is acted upon by a pilot valve 134 at non-driven consumers of the working hydraulics A pending in the delivery branch line 3b delivery pressure of the pump to pressurize the check valve 131 in the blocking position.
  • control pressure chamber 132 to the container 2 can be relieved by means of the pilot valve 134, so that the check valve 131 of the present in the delivery branch line 3b delivery pressure, which is present at a acting in the direction of the open position control surface of the check valve 131, is turned on in a flow position.
  • the pilot valve 134 is connected to a control line 135 branching off from the delivery branch line 3b upstream of the check valve 131 and a discharge line 136 led to the container 2.
  • the pilot valve 134 has a first control position 134a, in which the control pressure chamber 132 of the check valve 131 to the control line 135 and thus the delivery branch line 3b upstream of the check valve 131 is connected to actuate the check valve 131 in the blocking position.
  • a second control position 134b of the pilot valve 134 the control pressure chamber 132 of the check valve 131 is connected via the drain line 136 to the container 2 to discourage negligencen the check valve 131 in the open position.
  • the pilot valve 131 is acted upon by means of a spring device 137 in the first control position 134a and actuated by means of an actuating device 138 in the second control position 134b.
  • the actuating device 138 is formed in the illustrated embodiment as a hydraulic control pressure surface which is connected to the control pressure supply line 120.
  • the safety device S comprises a safety valve 140.
  • the safety valve 140 is at non-actuated consumers of the working hydraulics the control pressure supply line 120 guided to the actuator 138 configured as the control pressure surface Container 2 relieved and when controlling the load of the working hydraulics A, the control pressure supply line 120 connected to the control pressure source 121.
  • the safety valve 140 is arranged for this purpose in the control pressure supply line 120 and has a first control position 140a, in which the control pressure supply line 120 is relieved to the container 2. In a second control position 140b of the safety valve 140, the control pressure supply line 120 is connected to the control pressure source 121.
  • the safety valve 140 is acted upon by means of a spring device 141 in the first control position 140a and acted upon by an electrical actuator 142, such as a solenoid, in the second control position 140b.
  • the safety device S further comprises a further safety valve 150, by means of which the load pressure signal line 22 of the pump 1 is relieved when the steering device L is not actuated and the driven hydraulics A are not actuated, and when the steering device L is operated and / or when the load of the working hydraulics is actuated A in the load pressure signal line pending load pressure signal to the control valve device 6 of the pump 1 is performed.
  • the further safety valve 150 is arranged in a guided from the load pressure signal line 22 to the container 2 branch line 151 and has a flow position 150a, in which the load pressure signal line 22 is relieved to the container 2, and a blocking position 150b, in which the connection of the load pressure signal line 22 to Container 2 is shut off.
  • the further safety valve 150 is acted upon by means of a spring device 152 in the flow position 150 a, in which the load pressure signal line 22 is relieved to the container 2.
  • the control valve means 6 of the pump 1 is acted upon in the direction of a reduction of the flow rate and the pump 1 is in a setting with the flow rate zero.
  • the further safety valve 150 is acted upon by means of an electrical actuator 153, for example a solenoid in the blocking position 150b, in which the load pressure signal in the load pressure signal line 22 of the driven consumer, the control valve device 6 of the pump 1 in the direction of increasing the flow rate of the pump 1 applied.
  • an electrical actuator 153 for example a solenoid in the blocking position 150b, in which the load pressure signal in the load pressure signal line 22 of the driven consumer, the control valve device 6 of the pump 1 in the direction of increasing the flow rate of the pump 1 applied.
  • the safety device S further comprises an additional safety valve 160, by means of which the load pressure signal leading load pressure signal line 21 of the pump 101 is relieved at non-driven consumers of the working hydraulics A and at a control of the load of the working hydraulics A pending in the load pressure signal line load pressure signal to the control valve means 106 of another pump 101 is guided.
  • the additional safety valve 160 is arranged in a guided from the load pressure signal line 21 to the container 2 branch line 161 and has a flow position 160a, in which the load pressure signal line 21 is relieved to the container 2, and a blocking position 160b in which the connection of the load pressure signal line 21 to Container 2 is shut off.
  • the additional safety valve 160 is acted upon by means of a spring device 162 in the flow position 160a, in which the load pressure signal line 21 is relieved to the container 2.
  • the control valve means 106 of the pump 101 is acted upon in the direction of a reduction of the delivery rate and the pump 101 is in a setting with the delivery rate zero.
  • the further safety valve 160 is acted upon by means of an electric actuator 163, such as a solenoid, in the blocking position 160b, in which the load pressure signal of the controlled consumer in the load pressure signal line 21, the control valve means 106 of the pump 101 is acted upon in the direction of increasing the flow rate of the pump 101.
  • an electric actuator 163 such as a solenoid
  • the electrically operable safety valves 140, 150, 160 of the safety device S are actuated by means of an electronic control device, not shown, which is operatively connected to a steering sensor device 170 to determine the operation of the steering device L upon actuation of the steering wheel 5a by an operator.
  • the electronic control device is also connected to actuating elements, not shown, for example, joysticks, in conjunction, by means of which the control means 110 of the control valves 105 of the working hydraulics A for actuation of the control valves 105 are controlled. Based on the control signals of the actuating elements and thus the control signals of the control valves 105, an actuation of the actuating elements by the operator and thus a desired control of the load of the working hydraulics A can be determined in this case.
  • the safety valves 150, 160 located in the flow-through positions 150a, 160a ensure, by relieving the load pressure signal lines 21, 22, that the pumps 1, 101 are set to the flow rate zero and remain in this position.
  • the actuation of the steering device L can be detected on the basis of the sensor signal of the steering sensor device 170.
  • the safety valve 150 is actuated by the electronic control device, so that the safety valve 150 is acted upon in the blocking position 150b in which the load pressure of the steering device L present in the load pressure signal line 21 acts on the control valve device 6 and the pump 1 in the direction of a Increase of the flow rate is adjusted.
  • the priority valve P By means of the priority valve P, a supply of the steering device L is ensured with the required by the steering device L flow.
  • the pump 1 deliver a consumption of the steering device L exceeding flow, it can not flow to the control valves 105 of the working hydraulics A and the unintentional movement of the consumers of the working hydraulics A on the non-actuated safety valve 140 in the blocking position shut-off valve device 130 and a load handled by consumers. With the shut-off valve device 130 located in the blocking position, an undesired actuation of the consumers of the working hydraulics can thus be avoided when the steering device L is operated alone.
  • the safety valves 140, 150, 160 are actuated by the electronic control device, so that the safety valve 140 is acted on in the second control position 140b and the safety valves 150 , 160 in the blocking positions 150b, 160b are acted upon.
  • control pressure supply line 120 is connected to the control pressure source 121, so that a control pressure for actuating the corresponding control valve 105 can be generated by a control of the drive device 110.
  • control pressure acts on the pilot valve 134 of the check valve 131 in the second control position 134 b, in which the control pressure chamber 132 of the check valve 131 is relieved to the container 2.
  • the safety valves 150, 160 located in the blocking position 150b, 160b enable the load pressure of the controlled consumer present in the load pressure signal line 21 to act on the control valve device 6 of the pump 1 and the control valve device 106 of the pump 101 and both pumps 1, 101 in the direction an increase in the flow rate can be adjusted.
  • the flowing from the pump 1 via the priority valve P in the delivery branch line 3b flow applied to the check valve 131 of the shut-off valve 130 in the open position and controls the shut-off valve 130, so that the consumers of the working hydraulics A of both pumps 1, 101 are supplied with pressure medium.
  • the steering device L is actuated at the same time, the preferred supply of the steering device with pressure medium from the pump 1 is ensured by means of the priority valve P, wherein the excess of the pump 1, the demand of the steering device L exceeding flow through the delivery branch line 3b and the open shut-off valve device 130 is the consumers of the working hydraulics A available.

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  • Engineering & Computer Science (AREA)
  • Structural Engineering (AREA)
  • Civil Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Mining & Mineral Resources (AREA)
  • Mechanical Engineering (AREA)
  • Physics & Mathematics (AREA)
  • Fluid Mechanics (AREA)
  • Transportation (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Geology (AREA)
  • Fluid-Pressure Circuits (AREA)
  • Power Steering Mechanism (AREA)
EP13162479.3A 2012-04-27 2013-04-05 Installation hydraulique d'une machine de travail mobile Not-in-force EP2657178B9 (fr)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE201210103732 DE102012103732A1 (de) 2012-04-27 2012-04-27 Hydraulikanlage einer mobilen Arbeitsmaschine

Publications (4)

Publication Number Publication Date
EP2657178A2 true EP2657178A2 (fr) 2013-10-30
EP2657178A3 EP2657178A3 (fr) 2014-09-03
EP2657178B1 EP2657178B1 (fr) 2015-09-30
EP2657178B9 EP2657178B9 (fr) 2015-12-09

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EP13162479.3A Not-in-force EP2657178B9 (fr) 2012-04-27 2013-04-05 Installation hydraulique d'une machine de travail mobile

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DE (1) DE102012103732A1 (fr)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP3127856A1 (fr) * 2015-08-07 2017-02-08 Linde Material Handling GmbH Systeme de commande hydraulique a economie d'energie pour chariot de manutention et procede de reduction de la consommation d'energie pour chariot de manutention
CN106593982A (zh) * 2017-01-04 2017-04-26 浙江高宇液压机电有限公司 可实现变量泵合分流时变排量的逻辑控制阀

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP6496633B2 (ja) * 2015-08-04 2019-04-03 株式会社豊田自動織機 産業車両

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102008052079A1 (de) * 2008-10-17 2010-04-22 Linde Material Handling Gmbh Hydrostatisches Antriebssystem einer mobilen Arbeitsmaschine
DE102010048890A1 (de) * 2010-10-19 2012-04-19 Linde Material Handling Gmbh Hydrostatisches Antriebssystem

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
None

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP3127856A1 (fr) * 2015-08-07 2017-02-08 Linde Material Handling GmbH Systeme de commande hydraulique a economie d'energie pour chariot de manutention et procede de reduction de la consommation d'energie pour chariot de manutention
CN106593982A (zh) * 2017-01-04 2017-04-26 浙江高宇液压机电有限公司 可实现变量泵合分流时变排量的逻辑控制阀

Also Published As

Publication number Publication date
EP2657178B1 (fr) 2015-09-30
EP2657178A3 (fr) 2014-09-03
DE102012103732A1 (de) 2013-10-31
EP2657178B9 (fr) 2015-12-09

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