EP2937307B9 - Système d'entrainement hydraulique d'un chariot de manutention - Google Patents

Système d'entrainement hydraulique d'un chariot de manutention Download PDF

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Publication number
EP2937307B9
EP2937307B9 EP15163350.0A EP15163350A EP2937307B9 EP 2937307 B9 EP2937307 B9 EP 2937307B9 EP 15163350 A EP15163350 A EP 15163350A EP 2937307 B9 EP2937307 B9 EP 2937307B9
Authority
EP
European Patent Office
Prior art keywords
drive
variable displacement
power
displacement pump
lifting
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.)
Not-in-force
Application number
EP15163350.0A
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German (de)
English (en)
Other versions
EP2937307A1 (fr
EP2937307B1 (fr
Inventor
Markus Schwab
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.)
STILL GmbH
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STILL GmbH
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Publication date
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Publication of EP2937307A1 publication Critical patent/EP2937307A1/fr
Application granted granted Critical
Publication of EP2937307B1 publication Critical patent/EP2937307B1/fr
Publication of EP2937307B9 publication Critical patent/EP2937307B9/fr
Not-in-force legal-status Critical Current
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

Definitions

  • the invention relates to a hydraulic drive system of a truck, wherein the drive system has a working hydraulics comprising a lifting drive and at least one power take-off, wherein for supplying the lifting drive and the at least one power take-off, a variable in the delivery volume variable displacement pump is provided, which is for driving with an internal combustion engine in Active connection is, wherein the installed hydraulic power of the variable displacement pump is greater than the rated power of the internal combustion engine, wherein the variable displacement pump for adjusting the delivery volume has an adjusting device which is provided with a power limiting device.
  • variable displacement in the variable displacement pump With a pressure regulator and a flow regulator, which are referred to as load-sensing variable displacement pumps.
  • the maximum drive torque to be transmitted to the variable displacement pump by the internal combustion engine is limited by constructional conditions, for example by a clutch arranged between the internal combustion engine and the variable displacement pump or a power takeoff of the internal combustion engine driving the variable displacement pump.
  • the maximum drive torque to be transmitted corresponds to the product of the maximum delivery volume, ie the displacement per revolution, and the maximum system pressure of the variable displacement pump.
  • the maximum system pressure is usually hedged in such drive systems by means of a pressure relief valve.
  • the effect occurs that at cold pressure medium temperatures, for example, after the start of operation of the truck in cold ambient conditions, a lifting operation of the linear actuator with maximum system pressure and maximum delivery occurs.
  • the maximum delivery volume of the variable displacement pump is thus to be interpreted and limited based on the maximum drive torque to be transmitted and the maximum system pressure.
  • the pressure required to lift a load is approx. 15% up to 85% below the maximum system pressure protected by the pressure relief valve. It is disadvantageous that about 15% to 85% of the maximum available drive torque can not be used in the form of delivery volume of the variable.
  • due to the limited displacement of the variable displacement of the engine when lifting a load by means of the lifting drive of the engine must be operated at a high speed to compensate for the limited displacement of the variable.
  • the DE 10 2008 059 181 A1 discloses a generic hydraulic drive system of a truck according to the preamble of claim 1.
  • the present invention is based on the object to provide a hydraulic drive system of the type mentioned with an oversized in the delivery volume variable displacement available, in which the adjustment of the delivery volume of the variable is carried out in a simple manner.
  • the power limiting device of the adjusting device is set such that from a predetermined limit of the lifting drive pending load to be lifted, the power limit of the power limiting device is effective and that an electronic control device is provided, the input side with a recorded load of Hubantriebs detecting sensor device is operatively connected and the output side is in operative connection with a speed setting device of the internal combustion engine, wherein the electronic control device is designed such that above the limit value of the lifting drive to be lifted load the speed of the internal combustion engine is raised to achieve a predetermined lifting speed.
  • a sensor device In conjunction with a sensor device can be determined by an electronic control device in a simple manner, the achievement of the limit of the lifting drive pending load to be lifted, in which the power limit by reducing the delivery volume of the variable starts.
  • the power limiting the variable displacement pump can thus be raised by the electronic control device in a simple way, the speed of the engine to compensate for the reduced displacement of the variable by a speed increase of the engine and to achieve a constant stroke speed over all loads from zero to maximum load.
  • the power limiting device is designed as a power regulator, which changes the delivery volume of the variable displacement pump in dependence on the system pressure of the drive system such that the drive torque of the variable displacement pump is constant.
  • a performance regulator which controls the delivery volume and thus the delivery flow of the variable in dependence on the system pressure so that the product of flow and pressure is kept constant, a power limitation and thus a torque limiter can be achieved in a simple manner.
  • the sensor device is designed as a pressure sensor of the lifting drive detecting pressure sensor.
  • a pressure sensor of the lifting drive detecting pressure sensor can be determined with low construction costs, the load.
  • the adjusting device of the pump further comprises a pressure regulator and a flow regulator.
  • a pressure regulator can be easily achieved a pressure cut.
  • a flow regulator such as a load-sensing controller, allows easy adjustment of the delivery volume to the load.
  • FIG. 1 is a circuit diagram of a hydraulic drive system 1 of the invention illustrated an industrial truck.
  • the drive system 1 has a working hydraulics 2, which comprises a lifting drive 3 and at least one auxiliary drive 4, 5, 6.
  • the lifting drive 3 comprises at least one hydraulic lifting cylinder, which is in communication with a non-illustrated load-receiving means of the truck for lifting and lowering a load L.
  • the working hydraulics 2 comprises, in addition to the lifting drive 3, at least one auxiliary drive 4, 5, for example a tilt drive of a mast and / or a side slide drive for the load receiving means.
  • Another power take-off 6 is formed by a fan drive, such as a hydraulic motor driving a fan, a cooling system 7.
  • the lifting drive 3 and the secondary consumers 4, 5 are controllable by means of control valves, for example, in intermediate positions throttling directional control valves, which are combined in a control valve block 8.
  • a control valve 10 for controlling the lowering movement and the lifting movement of the lifting drive 2 is shown.
  • a control valve 12, 13 is arranged in the control valve block 8 respectively.
  • a control valve 14 may also be provided, which is also preferably arranged in the control valve block 8.
  • variable in the delivery volume adjustment pump 15 is provided which is operatively connected to the drive with an internal combustion engine 16.
  • the variable displacement pump 15 is operated in the open circuit, the pressure medium by means of a suction line 17 from a container 18 sucks and promotes in a feed line 19 which is guided to the control valve block 8 and to the control valves 10-14 of the consumers are connected. From the control valve block 8, a return line 21 leads to the container 18.
  • the cooling system 7 can be used for cooling the internal combustion engine 16 and / or for cooling the pressure medium of the working hydraulics 2.
  • the variable displacement pump 15 has an adjusting device 25 for setting the delivery volume, which is in operative connection with a delivery volume adjusting device 26 of the variable displacement pump 15.
  • the variable displacement pump 15 may be formed as an axial piston machine in swash plate design, in which the winningvolumeneinstellvorides 26 is formed as adjustable in inclination swash plate.
  • the adjusting device 25 of the variable displacement pump 15 has a pressure regulator 30 and a flow regulator 31.
  • the pressure regulator 30 is designed such that the delivery volume of the variable displacement pump 15 is limited or reduced upon reaching a set delivery pressure, so that the pressure regulator 30 limits the maximum delivery pressure of the variable displacement pump.
  • the flow rate controller 31 is configured such that the Delivery volume of the variable displacement pump is controlled in response to the highest load pressure of the driven load, so that the variable displacement pump 15 supplies the requested by the driven loads flow in the delivery line 19 as needed.
  • the adjusting device 25 of the variable displacement pump 15 further comprises a power limiting device 32.
  • the power limiting device 32 is designed as a power controller 33, which is designed such that in dependence on the in the delivery line 19 pending delivery pressure of the variable displacement pump 15 and thus the system pressure of the drive system 1, the delivery volume of the variable displacement pump 15 is controlled such that the drive torque, the corresponds to the product of the delivery volume and the delivery pressure of the variable displacement pump 15, the variable displacement pump 15 is constant.
  • the power limiting device 32 of the adjusting device 25 is set such that, starting from a predetermined limit value of the load L to be lifted on the lifting drive 3, the power limitation and thus the torque limitation of the power limiting device 32 becomes effective.
  • an electronic control device 35 is provided, which is on the input side with a recorded load L of the linear actuator 3 sensing sensor device 36 in operative connection and the output side is in operative connection with a speed control device 37 of the engine 16.
  • the electronic control device 35 is designed such that, above the limit value of the load L to be lifted on the lifting drive 3, the rotational speed of the internal combustion engine 15 is raised in order to achieve a predetermined lifting speed.
  • the sensor device 36 is preferably designed as a pressure sensor 38 detecting the pressure of the lifting drive 3.
  • variable displacement pump 15 with a power limiting device 32 makes it possible for the installed hydraulic power of the variable displacement pump 15 to be greater than Perform rated power of the engine 15, ie over-variable the variable displacement 15.
  • the nominal power of the internal combustion engine 16 adjusts itself at the nominal rotational speed of the internal combustion engine 16.
  • the installed hydraulic power of the variable displacement pump 15 results arithmetically from the product of the maximum delivery flow (delivery volume multiplied by the rated speed) and the maximum system pressure. This makes it possible to select the maximum delivery volume of the variable displacement pump 16 such that at rated speed of the engine 16 of the mathematically calculated from the product of the maximum delivery volume and the nominal speed flow of the variable displacement pump 16 exceeds the maximum required in the working hydraulics 2 flow rate.
  • the over-dimensioned in the maximum delivery volume and oversize variable displacement pump 16 can thus be used to reduce when operating the load of the working hydraulics 2, the speed of the engine 16 relative to the rated speed to save fuel and to achieve a reduced noise level.
  • FIG. 2 is shown by diagrams, the power limit and thus the torque limit of the invention power-limited and oversized in the maximum displacement variable pump 15.
  • the delivery volume Q of the variable displacement pump 15 is shown on the abscissa and the system pressure p is shown on the ordinate.
  • the maximum possible delivery volume Q 1max of the variable displacement pump 15 at a system pressure p 1 for a maximum allowable drive torque M is calculated from the product of the pressure p 1 and the delivery volume Q 1max .
  • the power-controlled variable displacement pump 15 thus makes it possible to increase the delivery volume Q at a low system pressure p - as in the US Pat FIG. 2 is illustrated by the arrows 40, 41 - to take advantage of the maximum permissible drive torque.
  • FIG. 3 is based on a diagram, the speed of the engine 16 with the inventive power-limited and oversized in the maximum flow volume variable displacement pump 15 via the load L of the lifting drive 3 for different constant lifting speeds of the lifting drive 3 shown.
  • the line 50 shows a curve of the speed n of the internal combustion engine 16 using a variable displacement pump of the prior art with a pressure regulator and a delivery rate controller for a constant first stroke speed. To achieve the constant first lifting speed of the engine 16 is to operate at the rated speed n nominal .
  • the line 51 shows a profile of the rotational speed of the internal combustion engine 16 using a power-limited variable displacement pump 15 according to the invention which is oversized in the maximum delivery volume for a constant second lifting speed which is greater than the first stroke speed.
  • a power-limited variable displacement pump 15 which is oversized in the maximum delivery volume for a constant second lifting speed which is greater than the first stroke speed.
  • the line 52 shows a profile of the rotational speed of the internal combustion engine 16 using a power-limited according to the invention and in the maximum delivery volume oversized variable displacement pump 15 for a constant third stroke speed, which is greater than the second stroke speed.
  • the line 53 shows a profile of the rotational speed of the internal combustion engine 16 using a power-limited according to the invention and in the maximum delivery volume oversized variable displacement pump 15 for a constant fourth stroke speed, which is greater than the third stroke speed.
  • the engine 16 is to be operated at the speed n 3 , which is higher than the speed n 2 and lower than the rated speed n nominal .
  • the increase in the rotational speed of the internal combustion engine 16 is effected by means of the electronic control device 35, which determines the reaching of the limit value L limit of the load L on the basis of the sensor device 36 and controls the speed setting device 37 of the internal combustion engine 16 accordingly.
  • variable displacement pump 15 With the power-limited and thus torque-limited variable displacement pump 15 according to the invention, it is also possible to oversize the variable displacement pump 15 so that increased lifting speeds and thus increased handling capacity of the industrial truck are achieved.
  • oversized and in the delivery volume oversized variable displacement pump 15 it is also possible to compensate for a parallel operation of the lifting drive 3 in lifting operation and a PTO 4-6, for example, the fan drive, the power losses, so that a reduction in the lifting speed by the requested performance the auxiliary drive can be avoided.

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  • Engineering & Computer Science (AREA)
  • Transportation (AREA)
  • Structural Engineering (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Civil Engineering (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Geology (AREA)
  • Mechanical Engineering (AREA)
  • Fluid-Pressure Circuits (AREA)

Claims (5)

  1. Système d'entraînement hydraulique (1) d'un chariot de manutention, dans lequel le système d'entraînement hydraulique (1) comporte un système hydraulique de travail (2) qui comprend un entraînement de levage (3) et au moins un entraînement auxiliaire (4 ; 5 ; 6), dans lequel il est prévu pour l'alimentation de l'entraînement de levage (3) et de l'au moins un entraînement auxiliaire (4 ; 5 ; 6) une pompe à débit variable (15) dont le volume de refoulement peut être réglé, qui est en liaison fonctionnelle avec un moteur à combustion interne (16), dans lequel la puissance hydraulique installée de la pompe à débit variable (15) est supérieure à la puissance nominale du moteur à combustion interne (16), dans lequel la pompe à débit variable (15) comporte, pour le réglage du volume de refoulement, un dispositif de réglage (25) qui est doté d'un dispositif de limitation de puissance (32), caractérisé en ce que le dispositif de limitation de puissance (32) du dispositif de réglage (25) est configuré de manière à ce qu'à partir d'une valeur limite prédéterminée (LGrenz) d'une charge (L) à soulever présente sur l'entraînement de levage (3), la limitation de puissance du dispositif de limitation de puissance (32) soit active et en ce qu'il est prévu un dispositif de commande électronique (35) qui est en liaison fonctionnelle avec un dispositif de détection (36) détectant la charge (L) reçue par l'entraînement de levage (3) et est en relation fonctionnelle, côté sortie, avec un dispositif de réglage de vitesse de rotation (37) du moteur à combustion interne (16), dans lequel le dispositif de commande électronique (35) est conçu de manière à ce que, au-dessus de la valeur limite (LGrenz) de la charge (L) à soulever présente sur l'entraînement de levage (3), la vitesse de rotation (n) du moteur à combustion interne (16) soit augmentée afin d'atteindre une vitesse de levage prédéterminée.
  2. Système d'entraînement hydraulique selon la revendication 1, caractérisé en ce que le dispositif de limitation de charge (32) est réalisé sous la forme d'un régulateur de charge (33) qui modifie le volume de refoulement de la pompe à débit variable (15) en fonction de la pression système (p) du système d'entraînement (1) de manière à ce que le couple de rotation d'entraînement de la pompe à débit variable (15) soit constant.
  3. Système d'entraînement hydraulique selon la revendication 1 ou 2, caractérisé en ce que le dispositif de détection (36) est réalisé sous la forme d'un capteur de pression (38) détectant la pression de l'entraînement de levage.
  4. Système d'entraînement hydraulique selon l'une quelconque des revendications 1 à 3, caractérisé en ce que le dispositif de réglage (25) de la pompe à débit variable (15) comprend un régulateur de pression (30) et un régulateur de débit (31).
  5. Système d'entraînement hydraulique selon l'une quelconque des revendications 1 à 4, caractérisé en ce que l'entraînement auxiliaire (6) est réalisé sous la forme d'un entraînement de ventilateur d'un système de refroidissement (7).
EP15163350.0A 2014-04-22 2015-04-13 Système d'entrainement hydraulique d'un chariot de manutention Not-in-force EP2937307B9 (fr)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE102014105659.0A DE102014105659A1 (de) 2014-04-22 2014-04-22 Hydraulisches Antriebssystem eines Flurförderzeug

Publications (3)

Publication Number Publication Date
EP2937307A1 EP2937307A1 (fr) 2015-10-28
EP2937307B1 EP2937307B1 (fr) 2016-11-23
EP2937307B9 true EP2937307B9 (fr) 2017-11-15

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EP15163350.0A Not-in-force EP2937307B9 (fr) 2014-04-22 2015-04-13 Système d'entrainement hydraulique d'un chariot de manutention

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DE (1) DE102014105659A1 (fr)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102016000186A1 (de) * 2016-01-11 2017-07-13 Liebherr-Hydraulikbagger Gmbh Vorrichtung zur regelbaren Hydraulikversorgung unterschiedlich geregelter hydraulischer Verbraucher sowie Hydrauliksystem und Arbeitsmaschine

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102007035341A1 (de) 2007-07-27 2009-01-29 Linde Material Handling Gmbh Flurförderzeug mit einem Verbrennungsmotor und einer überdimensionierten Verstellpumpe in einem hydrostatischen Kreislauf
DE102008048054A1 (de) * 2008-09-19 2010-03-25 Still Gmbh Hydrostatisches Antriebssystem
DE102008059181A1 (de) * 2008-11-27 2010-06-02 Still Gmbh Mobile Arbeitsmaschine, insbesondere Flurförderzeug, und Verfahren zum Betreiben der mobilen Arbeitsmaschine

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DE102014105659A1 (de) 2015-10-22
EP2937307A1 (fr) 2015-10-28
EP2937307B1 (fr) 2016-11-23

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