EP3524566B1 - Industrial truck - Google Patents

Industrial truck Download PDF

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Publication number
EP3524566B1
EP3524566B1 EP19155223.1A EP19155223A EP3524566B1 EP 3524566 B1 EP3524566 B1 EP 3524566B1 EP 19155223 A EP19155223 A EP 19155223A EP 3524566 B1 EP3524566 B1 EP 3524566B1
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EP
European Patent Office
Prior art keywords
industrial truck
power electronics
fan
pressure medium
hydraulic system
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EP19155223.1A
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German (de)
French (fr)
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EP3524566A1 (en
Inventor
Heribert Mittmann
Thorsten Heilen
Boy Gonnsen
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STILL GmbH
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STILL GmbH
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    • 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
    • B66F9/07595—Cooling arrangements for device or operator

Definitions

  • the invention relates to an industrial truck, in particular a counterbalanced forklift truck, with power electronics that are cooled by means of at least one fan that generates a flow of cooling air to cool the power electronics, and with an oil tank of a hydraulic system.
  • Industrial trucks have a hydraulic system formed by the working hydraulics in order to control the working functions of a load-carrying device, for example a lifting drive for raising and lowering the load-carrying device and/or a tilting drive for the load-carrying device or a mast on which the load-carrying device can be raised and lowered.
  • a load-carrying device for example a lifting drive for raising and lowering the load-carrying device and/or a tilting drive for the load-carrying device or a mast on which the load-carrying device can be raised and lowered.
  • the steering device can form a further consumer of the working hydraulic system.
  • the pressure medium heats up considerably, since particularly when the load handling device is lowering, there is a high heat input into the pressure medium of the hydraulic system, which is formed by hydraulic oil, on the control directional valve that controls the lifting drive due to throttling of the lowering volume flow.
  • the pressure medium of the hydraulic system has a heat exchanger through which the pressure medium of the hydraulic system flows, for example a pressure medium/air heat exchanger, and a driven fan that generates a flow of cooling air at the pressure medium/air heat exchanger in order to increase the cooling capacity.
  • the fan can be driven mechanically by an internal combustion engine of the industrial truck, hydraulically or electrically.
  • the pressure medium of the hydraulic system is routed through the pressure medium/air heat exchanger and heat energy is dissipated from the pressure medium of the hydraulic system to the environment with the help of a fan.
  • the volume flow of the pressure medium of the hydraulic system required for cooling the pressure medium can be branched off from an existing volume flow, for example by means of an additional hydraulic valve from the volume flow delivered by the hydraulic pump of the working hydraulics, or be generated by an additional circulation pump.
  • Such an active cooling of the pressure medium of the hydraulic system has due to the required pressure medium-air heat exchanger through which the pressure medium of the hydraulic system flows, the additional fan on the pressure medium-air heat exchanger, the tubing effort and the active pumping of the pressure medium of the hydraulic system and the associated if necessary required hydraulic valve for controlling the volume flow on a high construction cost and space requirements and causes a high additional manufacturing cost of the truck.
  • the fan generating the flow of cooling air at the pressure-medium-air heat exchanger generates additional noise.
  • the fan generating the flow of cooling air at the pressure medium/air heat exchanger requires additional energy for its operation and additional energy is required for the active circulation of the pressure medium of the hydraulic system.
  • Another disadvantage of such an active cooling of the pressure medium of the hydraulic system is the risk of leaks.
  • a generic industrial truck which is designed as a counterbalanced forklift truck and has power electronics that are cooled with a fan that cools the power electronics generated cooling airflow.
  • An oil tank of a hydraulic system can also be cooled by the cooling air flow from the power electronics fan.
  • the oil tank and the power electronics are installed in a receiving space below a battery.
  • An air inlet for the flow of cooling air is formed at the front of the accommodating space.
  • An air outlet opening, each with a fan, is arranged on the two opposite right and left outer sides of the receiving space, which generate the cooling air flow for cooling the oil tank and the power electronics.
  • the oil tank is here in the cooling air flow in front of and thus arranged upstream of the power electronics.
  • the DE 10 2004 030 560 A1 discloses a battery-powered industrial truck in which a cooling device is integrated in a hydraulic oil tank of a hydraulic system, which has a heat exchanger device formed by cooling ribs and a fan.
  • the present invention is based on the object of providing an industrial truck of the type mentioned at the outset, which is provided with a simply constructed, cost-effective and energy-saving cooling of the pressure medium of the hydraulic system.
  • the oil tank is provided with at least one heat sink through which the cooling air flow of the fan of the power electronics flows, the oil tank having a substantially vertically arranged tank wall, the at least one heat sink being arranged on the tank wall and is flowed through by the cooling air flow of the fan of the power electronics in the vertical direction from top to bottom, wherein the at least one heat sink is arranged in the cooling air flow of the fan downstream of the power electronics.
  • the pressure medium of the hydraulic system of the industrial truck is thus cooled by at least one heat sink being arranged on the oil tank, through which the cooling air flow of the existing fan of the power electronics flows.
  • cooling of the pressure medium in the hydraulic system of the industrial truck can be implemented with a simple structure and in a cost-effective manner, since no heat exchanger through which the pressure medium of the hydraulic system flows and no additional driven fan that generates a cooling air flow on the heat exchanger are required.
  • the invention does not require a pump to circulate a volume flow via tubing to the heat exchanger in order to cool the pressure medium of the hydraulic system, so that no hydraulic valve is required to control the volume flow of the pressure medium via the heat exchanger. Noise is reduced by eliminating the need for a powered fan that creates a flow of cooling air across the heat exchanger.
  • no energy is required for an additional fan that generates the cooling air flow on the heat exchanger, and no energy is required for the active circulation of the pressure medium of the hydraulic system.
  • the risk of leakage is reduced.
  • the oil tank has a substantially vertically arranged tank wall, the at least one heat sink being arranged on the tank wall and the cooling air flow of the fan of the power electronics flowing through it in the vertical direction from top to bottom.
  • the at least one heat sink is also arranged in the cooling air flow of the fan downstream of the power electronics.
  • the power electronics can be effectively cooled with cool air from the environment, since the power electronics are first traversed by the flow of cooling air.
  • the cooling air stream flows through the heat sink on the oil reservoir second and thus after (downstream) the power electronics and is thus cooled by the heated exhaust air from the power electronics, whereby an effective cooling of the pressure medium of the hydraulic system is nevertheless achieved.
  • the at least one heat sink is designed as a ribbed heat sink with vertically arranged fins.
  • a ribbed heat sink arranged on the oil tank which has vertically aligned fins, an effective and effective heat sink can be achieved with little construction effort Cooling of the pressure medium of the hydraulic system can be achieved by the cooling air flow of the fan of the power electronics.
  • the oil container is part of a vehicle frame of the industrial truck.
  • the oil tank is thus designed as part of the vehicle frame of the industrial truck and is integrated into the vehicle frame of the industrial truck.
  • the power electronics are arranged on a drive axle of the industrial truck, with the drive axle comprising at least one electric drive motor.
  • the power electronics arranged on the drive axle preferably control the at least one electric drive motor of the drive axle.
  • the oil container is arranged in the longitudinal direction of the industrial truck between the drive axle and a battery compartment of the industrial truck. This makes it possible that the cooling air flow after flowing through the power electronics at least one Cooling element on the oil tank can flow through from top to bottom over a short distance, whereby effective cooling of the power electronics and the pressure medium of the hydraulic system is achieved.
  • the fan of the power electronics is preferably designed as an electrically operated fan. This makes it possible to generate the cooling air flow for cooling the power electronics and the pressure medium of the hydraulic system with little construction effort.
  • an industrial truck 1 according to the invention is shown in a schematic side view.
  • the industrial truck 1 is designed as a counterbalanced forklift truck.
  • the industrial truck 1 is provided in the front area with a mast 2 and a raisable or lowerable load handling device L for picking up loads.
  • the industrial truck 1 is provided with a counterweight 3 in the rear area.
  • the industrial truck 1 comprises a vehicle frame 4.
  • a driver's overhead guard or a driver's cab, not shown in detail, is arranged on the vehicle frame 4, inside which there is a driver's workplace for an operator.
  • the industrial truck 1 is provided with a drive axle 7 with driven wheels 8 in the front area.
  • a steered wheel or a steering axle 10 provided with steered wheels 9 is provided in the rear area of the counterweight 3 .
  • the drive axle 7 is provided with a travel drive of the industrial truck 1 and includes a drive axle 7 arranged electric traction motor or several in the drive axle 7 arranged electric traction motors for driving the wheels 8.
  • Power electronics 15 are arranged on the drive axle 7 to control the electric traction motor or the electric traction motors. In the exemplary embodiment shown, the power electronics 15 are arranged on the upper side of the drive axle 7 .
  • the industrial truck 1 is provided with a hydraulic system designed as working hydraulics, which includes a lifting drive for raising and lowering the load handling device L and for tilting the mast 2 as a hydraulic consumer. Further hydraulic consumers of the working hydraulics can be formed by additional consumers, for example a sideshift for the load handling device L. If a hydraulic steering device is provided for steering the steered wheels 9, the hydraulic steering device can be provided as a further consumer of the working hydraulics.
  • the hydraulic system includes an oil tank 16.
  • the industrial truck 1 is designed as a battery-powered industrial truck 1 .
  • a traction battery 17 which is arranged in a battery compartment 18 of the vehicle frame 4 , is provided to supply the electric traction motor of the traction drive and an electric motor that drives the hydraulic pump of the hydraulic system.
  • the oil tank 16 of the hydraulic system is arranged in the longitudinal direction of the industrial truck between the drive axle 7 and the battery compartment 18 of the industrial truck 1 .
  • the oil tank 16 is part of the vehicle frame 4 of the industrial truck 1 and is therefore integrated into the vehicle frame 4 .
  • the oil tank 16 is preferably designed as a rectangular box of the vehicle frame 4, which extends in the vehicle transverse direction.
  • the power electronics 15 is cooled by means of at least one fan 20 which generates a flow of cooling air that cools the power electronics 15 .
  • the fan 20 is designed as an electrically operated fan which is arranged on the drive axle 7 or the power electronics 15 .
  • the oil tank 16 is provided with at least one heat sink 25 through which the cooling air flow of the fan 20 of the power electronics 15 flows.
  • the at least one cooling body 25 is thermally conductively connected to the oil tank 16 .
  • the oil tank 16 has a tank wall 16a arranged essentially vertically, with the at least one heat sink 25 being arranged on the tank wall 16a and the cooling air flow of the fan 20 of the power electronics 15 flowing through it in the vertical direction from top to bottom, as in FIG the figure 1 is illustrated by the arrows 30.
  • the vertically arranged container wall 16a is in this case the front wall of the oil container 16 which faces the power electronics 15 or the drive axle 7 .
  • the at least one heat sink 25 is designed as a ribbed heat sink 26 with vertically arranged fins 27 .
  • the at least one heat sink 25 is arranged in the cooling air flow of the fan 20 downstream of the power electronics 15 .
  • the fan 20 sucks in ambient air in front of the industrial truck 1 in the direction of travel, as in FIG figure 1 is illustrated by the arrow 31, which is guided through corresponding heat sinks of the power electronics 15, not shown in detail, in order to cool the power electronics 15.
  • the heated exhaust air cooling the power electronics 15 is then - as in the figure 1 is illustrated by the arrows 30 - guided from vertically top to bottom through the at least one cooling body 25, which is preferably designed as a ribbed cooling body 26 with vertically arranged fins 27, of the oil tank 16 in order to cool the pressure medium of the hydraulic system.
  • the exhaust air from the cooling of the power electronics 15 is thus routed through the vertically arranged fins 27 of the ribbed heat sink 26 .
  • the cooling air for cooling the oil tank 16 located in the pressure medium The hydraulic system is thus provided by the already existing fan 20 of the power electronics 15 .
  • the heated exhaust air from the cooling of the oil tank 16 then flows back into the environment on the underside of the industrial truck 1 .
  • the heat sink 25 can - as in the figure 2 can be seen - are divided into several partial heat sinks or one or more heat sinks 25 can be arranged on the oil tank 16 . This makes it possible in a cost-effective manner to equip industrial trucks 1 of different load capacity classes or industrial trucks 1 in the same load capacity classes, which differ in terms of power density, with an adapted cooling of the pressure medium of the hydraulic system.
  • the invention has a number of advantages.
  • the pressure medium of the hydraulic system can be cooled with a simple structure in a cost-effective and energy-saving manner.
  • no pressure medium has to be circulated from a pump via a hose to a heat exchanger through which the pressure medium of the hydraulic system flows, for example an oil cooler, which results in energy savings and no additional oil cooler, no additional fan on the oil cooler and no additional Hydraulic valve are required to control the flow rate flowing over the oil cooler.
  • an oil cooler By eliminating an additional fan on the oil cooler, noise is reduced and energy is saved.
  • the omission of an oil cooler with the corresponding hoses also reduces the risk of leaks. Due to the elimination of the oil cooler through which the pressure medium of the hydraulic system flows, the fan on the oil cooler and the required tubing, the assembly effort of the industrial truck is also reduced.
  • the cooling of the pressure medium of the hydraulic system according to the invention requires little servicing.
  • the at least one cooling body 25 can be arranged in a space-saving manner on the vertical wall 16a of the oil tank 16, so that space-saving cooling of the pressure medium of the hydraulic system is achieved.

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  • Engineering & Computer Science (AREA)
  • Transportation (AREA)
  • Structural Engineering (AREA)
  • Civil Engineering (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Geology (AREA)
  • Mechanical Engineering (AREA)
  • Forklifts And Lifting Vehicles (AREA)

Description

Die Erfindung betrifft ein Flurförderzeug, insbesondere Gegengewichtsgabelstapler, mit einer Leistungselektronik, die mittels mindestens eines Lüfters gekühlt ist, der einen die Leistungselektronik kühlenden Kühlluftstrom erzeugt, und mit einem Ölbehälter einer Hydraulikanlage.The invention relates to an industrial truck, in particular a counterbalanced forklift truck, with power electronics that are cooled by means of at least one fan that generates a flow of cooling air to cool the power electronics, and with an oil tank of a hydraulic system.

Flurförderzeuge weisen eine von der Arbeitshydraulik gebildete Hydraulikanlage auf, um die Arbeitsfunktionen eines Lastaufnahmemittels zu steuern, beispielsweise einen Hubantrieb zum Heben und Senken des Lastaufnahmemittels und/oder einen Neigeantrieb des Lastaufnahmemittels oder eines Hubgerüstes, an dem das Lastaufnahmemittel anhebbar und absenkbar angeordnet ist. Sofern das Flurförderzeug mit einer hydraulischen Lenkungsrichtung versehen ist, kann die Lenkungseinrichtung einen weiteren Verbraucher der Arbeitshydraulik bilden. Im Betrieb des Flurförderzeugs kommt es zu einer starken Erwärmung des Druckmittels, da insbesondere im Senkenbetrieb des Lastaufnahmemittels an dem den Hubantrieb steuernden Steuerwegeventil durch Drosselung des Senkenvolumenstroms ein hoher Wärmeeintrag in das von einem Hydrauliköl gebildete Druckmittel der Hydraulikanlage erfolgt.Industrial trucks have a hydraulic system formed by the working hydraulics in order to control the working functions of a load-carrying device, for example a lifting drive for raising and lowering the load-carrying device and/or a tilting drive for the load-carrying device or a mast on which the load-carrying device can be raised and lowered. If the industrial truck is equipped with a hydraulic steering device, the steering device can form a further consumer of the working hydraulic system. During operation of the industrial truck, the pressure medium heats up considerably, since particularly when the load handling device is lowering, there is a high heat input into the pressure medium of the hydraulic system, which is formed by hydraulic oil, on the control directional valve that controls the lifting drive due to throttling of the lowering volume flow.

Um im Betrieb des Flurförderzeugs das Druckmittel der Hydraulikanlage zu kühlen, ist es bereits bei Flurförderzeugen bekannt, keine aktive Kühlung für das Druckmittel der Hydraulikanlage vorzusehen, so dass ein Wärmeaustausch und eine Kühlung ausschließlich über natürliche Konvektion und eine Wärmestrahlung an den Komponenten der Hydraulikanlage erfolgt. Bei einer derartigen, nicht-aktiven Kühlung gelangt das Flurförderzeug jedoch schnell an die Leistungsgrenze, da das Druckmittel der Hydraulikanlage überhitzt. Aufgrund der sich im Betrieb des Flurförderzeugs einstellenden hohen Temperaturen des Druckmittels der Hydraulikanlage kann eine vorzeitige Alterung des Druckmittels auftreten sowie Stillstandszeiten durch Leckage oder der Ausfall von Bauteilen der Hydraulikanlage.In order to cool the pressure medium of the hydraulic system during operation of the industrial truck, it is already known for industrial trucks not to provide active cooling for the pressure medium of the hydraulic system, so that heat exchange and cooling take place exclusively via natural convection and thermal radiation on the components of the hydraulic system. With such non-active cooling, however, the industrial truck quickly reaches its performance limit since the pressure medium in the hydraulic system overheats. Due to the high temperatures of the pressure medium in the hydraulic system that occur during operation of the industrial truck, premature aging of the pressure medium and downtimes due to leaks or the failure of components in the hydraulic system can occur.

Zudem ist es bereits bei Flurförderzeugen bekannt, eine aktive Kühlung für das Druckmittel der Hydraulikanlage vorzusehen. Bei einer aktiven Kühlung des Druckmittels der Hydraulikanlage ist ein von dem Druckmittel der Hydraulikanlage durchströmter Wärmetauscher, beispielsweise ein Druckmittel-Luft-Wärmetauscher, vorhanden und ein angetriebener Lüfter, der einen Kühlluftstrom an dem Druckmittel-Luft-Wärmetauscher erzeugt, um die Kühlleistung zu erhöhen. Der Lüfter kann hierbei mechanisch von einem Verbrennungsmotor des Flurförderzeugs, hydraulisch oder elektrisch angetrieben sein. Bei einer derartigen aktiven Kühlung des Druckmittels der Hydraulikanlage ist somit ein von dem Druckmittel der Hydraulikanlage durchströmter Druckmittel-Luft-Wärmetauscher, beispielsweise ein Ölkühler, vorhanden. Dabei wird das Druckmittel der Hydraulikanlage durch den Druckmittel-Luft-Wärmetauscher geführt und mit Hilfe eines Lüfters Wärmeenergie aus dem Druckmittel der Hydraulikanlage an die Umgebung abgeführt. Der für die Kühlung des Druckmittels erforderliche Volumenstrom des Druckmittels der Hydraulikanlage kann hierbei von einem vorhandenen Volumenstrom abgezweigt werden, beispielsweise mittels eines zusätzlichen Hydraulikventils von dem von der Hydraulikpumpe der Arbeitshydraulik geförderten Volumenstrom abgezweigt werden, oder von einer zusätzlichen Umwälzpumpe erzeugt werden.In addition, it is already known in industrial trucks to provide active cooling for the pressure medium of the hydraulic system. With active cooling of the The pressure medium of the hydraulic system has a heat exchanger through which the pressure medium of the hydraulic system flows, for example a pressure medium/air heat exchanger, and a driven fan that generates a flow of cooling air at the pressure medium/air heat exchanger in order to increase the cooling capacity. In this case, the fan can be driven mechanically by an internal combustion engine of the industrial truck, hydraulically or electrically. With such an active cooling of the pressure medium of the hydraulic system, there is thus a pressure medium/air heat exchanger, for example an oil cooler, through which the pressure medium of the hydraulic system flows. The pressure medium of the hydraulic system is routed through the pressure medium/air heat exchanger and heat energy is dissipated from the pressure medium of the hydraulic system to the environment with the help of a fan. The volume flow of the pressure medium of the hydraulic system required for cooling the pressure medium can be branched off from an existing volume flow, for example by means of an additional hydraulic valve from the volume flow delivered by the hydraulic pump of the working hydraulics, or be generated by an additional circulation pump.

Eine derartige aktive Kühlung des Druckmittels der Hydraulikanlage weist jedoch aufgrund des erforderlichen von dem Druckmittel der Hydraulikanlage durchströmten Druckmittel-Luft-Wärmetauschers, des zusätzlichen Lüfters an dem Druckmittel-Luft-Wärmetauscher, des Verschlauchungsaufwands und des aktiven Umpumpens des Druckmittels der Hydraulikanlage und des hierzu gegebenenfalls erforderlichen Hydraulikventils zur Steuerung des Volumenstroms einen hohen Bauaufwand und Bauraumbedarf auf und verursacht einen hohen zusätzlichen Herstellaufwand des Flurförderzeugs. Zudem erzeugt der den Kühlluftstrom an dem Druckmittel-Luft-Wärmetauscher erzeugende Lüfter zusätzliche Geräusche. Weiterhin benötigt der den Kühlluftstrom an dem Druckmittel-Luft-Wärmetauscher erzeugende Lüfter zusätzliche Energie für dessen Betrieb und es ist zusätzliche Energie erforderlich für das aktive Umpumpen des Druckmittels der Hydraulikanlage. Ein weiterer Nachteil einer derartigen aktiven Kühlung des Druckmittels der Hydraulikanlage besteht in der Gefahr von Leckagen.Such an active cooling of the pressure medium of the hydraulic system, however, has due to the required pressure medium-air heat exchanger through which the pressure medium of the hydraulic system flows, the additional fan on the pressure medium-air heat exchanger, the tubing effort and the active pumping of the pressure medium of the hydraulic system and the associated if necessary required hydraulic valve for controlling the volume flow on a high construction cost and space requirements and causes a high additional manufacturing cost of the truck. In addition, the fan generating the flow of cooling air at the pressure-medium-air heat exchanger generates additional noise. Furthermore, the fan generating the flow of cooling air at the pressure medium/air heat exchanger requires additional energy for its operation and additional energy is required for the active circulation of the pressure medium of the hydraulic system. Another disadvantage of such an active cooling of the pressure medium of the hydraulic system is the risk of leaks.

Aus der DE 11 2013 000 002 T5 ist ein gattungsgemäßes Flurförderzeug bekannt, das als Gegengewichtsgabelstapler ausgebildet ist und eine Leistungselektronik aufweist, die mit einem Lüfter gekühlt ist, der einen die Leistungselektronik kühlenden Kühlluftstrom erzeugt. Ein Ölbehälter einer Hydraulikanlage kann weiterhin von dem Kühlluftstrom des Lüfters der Leistungselektronik gekühlt werden. Hierzu sind in einem Aufnahmeraum unterhalb einer Batterie der Ölbehälter und die Leistungselektronik verbaut. An der Vorderseite des Aufnahmeraums ist ein Lufteinlass für den Kühlluftstrom ausgebildet. An den beiden gegenüberliegenden rechten und linken Außenseiten des Aufnahmeraums ist jeweils eine Luftauslassöffnung mit jeweils einem Lüfter angeordnet, die den Kühlluftstrom zum Kühlen des Ölbehälters und der Leistungselektronik erzeugen Der Ölbehälter ist hierbei in dem Kühlluftstrom vor und somit stromauf der Leistungselektronik angeordnet.From the DE 11 2013 000 002 T5 a generic industrial truck is known, which is designed as a counterbalanced forklift truck and has power electronics that are cooled with a fan that cools the power electronics generated cooling airflow. An oil tank of a hydraulic system can also be cooled by the cooling air flow from the power electronics fan. For this purpose, the oil tank and the power electronics are installed in a receiving space below a battery. An air inlet for the flow of cooling air is formed at the front of the accommodating space. An air outlet opening, each with a fan, is arranged on the two opposite right and left outer sides of the receiving space, which generate the cooling air flow for cooling the oil tank and the power electronics. The oil tank is here in the cooling air flow in front of and thus arranged upstream of the power electronics.

Die DE 10 2004 030 560 A1 offenbart ein batterie-elektrisch betriebenes Flurförderzeug, bei dem in einem Hydrauliköltank einer Hydraulikanlage eine Kühlereinrichtung integriert ist, die eine von Kühlrippen gebildete Wärmetauschereinrichtung und einen Lüfter aufweist.The DE 10 2004 030 560 A1 discloses a battery-powered industrial truck in which a cooling device is integrated in a hydraulic oil tank of a hydraulic system, which has a heat exchanger device formed by cooling ribs and a fan.

Der vorliegenden Erfindung liegt die Aufgabe zugrunde, ein Flurförderzeug der eingangs genannten Gattung zur Verfügung zu stellen, das mit einer einfach aufgebauten, kostengünstigen und energiesparenden Kühlung des Druckmittels der Hydraulikanlage versehen ist.The present invention is based on the object of providing an industrial truck of the type mentioned at the outset, which is provided with a simply constructed, cost-effective and energy-saving cooling of the pressure medium of the hydraulic system.

Diese Aufgabe wird erfindungsgemäß dadurch gelöst, dass der Ölbehälter mit mindestens einem Kühlkörper versehen ist, der von dem Kühlluftstrom des Lüfters der Leistungselektronik durchströmt ist, wobei der Ölbehälter eine im Wesentlichen vertikal angeordnete Behälterwand aufweist, wobei der mindestens eine Kühlkörper an der Behälterwand angeordnet ist und von dem Kühlluftstrom des Lüfters der Leistungselektronik in vertikaler Richtung von oben nach unten durchströmt ist, wobei der mindestens eine Kühlkörper im Kühlluftstrom des Lüfters stromab der Leistungselektronik angeordnet ist.This object is achieved according to the invention in that the oil tank is provided with at least one heat sink through which the cooling air flow of the fan of the power electronics flows, the oil tank having a substantially vertically arranged tank wall, the at least one heat sink being arranged on the tank wall and is flowed through by the cooling air flow of the fan of the power electronics in the vertical direction from top to bottom, wherein the at least one heat sink is arranged in the cooling air flow of the fan downstream of the power electronics.

Erfindungsgemäß wird somit das Druckmittel der Hydraulikanlage des Flurförderzeugs gekühlt, indem an dem Ölbehälter mindestens ein Kühlkörper angeordnet wird, der von dem Kühlluftstrom des bereits vorhandenen Lüfters der Leistungselektronik durchströmt ist.According to the invention, the pressure medium of the hydraulic system of the industrial truck is thus cooled by at least one heat sink being arranged on the oil tank, through which the cooling air flow of the existing fan of the power electronics flows.

Hierdurch kann eine Kühlung des Druckmittels der Hydraulikanlage des Flurförderzeugs bei einfachem Aufbau und in kostengünstiger Weise umgesetzt werden, da kein von dem Druckmittel der Hydraulikanlage durchströmter Wärmetauscher und kein zusätzlicher angetriebener Lüfter erforderlich sind, der einen Kühlluftstrom an dem Wärmetauscher erzeugt. Zudem ist es bei der Erfindung nicht erforderlich, dass zur Kühlung des Druckmittels der Hydraulikanlage eine Pumpe einen Volumenstrom über eine Verschlauchung zu dem Wärmetauscher umpumpen muss, so dass weiterhin kein Hydraulikventil erforderlich ist, das den Volumenstrom des Druckmittels über den Wärmetauscher steuert. Durch den Entfall eines angetriebenen Lüfters, der einen Kühlluftstrom an dem Wärmetauscher erzeugt, werden Geräusche verringert. Weiterhin ist keine Energie erforderlich für einen den Kühlluftstrom an dem Wärmetauscher erzeugenden zusätzlichen Lüfter und keine Energie erforderlich für das aktive Umpumpen des Druckmittels der Hydraulikanlage. Zudem wird die Gefahr von Leckagen verringert.As a result, cooling of the pressure medium in the hydraulic system of the industrial truck can be implemented with a simple structure and in a cost-effective manner, since no heat exchanger through which the pressure medium of the hydraulic system flows and no additional driven fan that generates a cooling air flow on the heat exchanger are required. In addition, the invention does not require a pump to circulate a volume flow via tubing to the heat exchanger in order to cool the pressure medium of the hydraulic system, so that no hydraulic valve is required to control the volume flow of the pressure medium via the heat exchanger. Noise is reduced by eliminating the need for a powered fan that creates a flow of cooling air across the heat exchanger. Furthermore, no energy is required for an additional fan that generates the cooling air flow on the heat exchanger, and no energy is required for the active circulation of the pressure medium of the hydraulic system. In addition, the risk of leakage is reduced.

Erfindungsgemäß weist der Ölbehälter eine im Wesentlichen vertikal angeordnete Behälterwand auf, wobei der mindestens eine Kühlkörper an der Behälterwand angeordnet ist und von dem Kühlluftstrom des Lüfters der Leistungselektronik in vertikaler Richtung von oben nach unten durchströmt ist. Hierdurch wird mit geringem Bauaufwand eine effektive und wirksame Kühlung des Druckmittels der Hydraulikanlage von dem Kühlluftstrom des Lüfters der Leistungselektronik erzielt.According to the invention, the oil tank has a substantially vertically arranged tank wall, the at least one heat sink being arranged on the tank wall and the cooling air flow of the fan of the power electronics flowing through it in the vertical direction from top to bottom. As a result, effective cooling of the pressure medium of the hydraulic system by the cooling air flow of the fan of the power electronics is achieved with little construction effort.

Erfindungsgemäß ist weiterhin der mindestens eine Kühlkörper im Kühlluftstrom des Lüfters stromab der Leistungselektronik angeordnet ist. Hierdurch kann eine effektive Kühlung der Leistungselektronik mit kühler Luft aus der Umgebung erzielt werden, da die Leistungselektronik an erster Stelle von dem Kühlluftstrom durchströmt wird. Der Kühlkörper am Ölbehälter wird an zweiter Stelle und somit nach (stromab) der Leistungselektronik von dem Kühlluftstrom durchströmt und somit von der erwärmten Abluft der Leistungselektronik gekühlt, wodurch trotzdem eine effektive Kühlung des Druckmittels der Hydraulikanlage erzielt wird.According to the invention, the at least one heat sink is also arranged in the cooling air flow of the fan downstream of the power electronics. As a result, the power electronics can be effectively cooled with cool air from the environment, since the power electronics are first traversed by the flow of cooling air. The cooling air stream flows through the heat sink on the oil reservoir second and thus after (downstream) the power electronics and is thus cooled by the heated exhaust air from the power electronics, whereby an effective cooling of the pressure medium of the hydraulic system is nevertheless achieved.

Gemäß einer vorteilhaften Ausgestaltungsform der Erfindung ist der mindestens eine Kühlkörper als Rippenkühlkörper mit vertikal angeordneten Lamellen ausgebildet. Mit einem am Ölbehälter angeordneten Rippenkühlkörper, der vertikal ausgerichtete Lamellen aufweist, kann mit geringem Bauaufwand eine effektive und wirksame Kühlung des Druckmittels der Hydraulikanlage von dem Kühlluftstrom des Lüfters der Leistungselektronik erzielt werden.According to an advantageous embodiment of the invention, the at least one heat sink is designed as a ribbed heat sink with vertically arranged fins. With a ribbed heat sink arranged on the oil tank, which has vertically aligned fins, an effective and effective heat sink can be achieved with little construction effort Cooling of the pressure medium of the hydraulic system can be achieved by the cooling air flow of the fan of the power electronics.

Der Ölbehälter ist gemäß einer vorteilhaften Ausgestaltungsform der Erfindung Bestandteil eines Fahrzeugrahmens des Flurförderzeugs. Der Ölbehälter ist somit als Teil des Fahrzeugrahmens des Flurförderzeugs ausgebildet und in den Fahrzeugrahmen des Flurförderzeugs integriert.According to an advantageous embodiment of the invention, the oil container is part of a vehicle frame of the industrial truck. The oil tank is thus designed as part of the vehicle frame of the industrial truck and is integrated into the vehicle frame of the industrial truck.

Gemäß einer vorteilhaften Ausgestaltungsform der Erfindung ist die Leistungselektronik an einer Antriebsachse des Flurförderzeugs angeordnet, wobei die Antriebsachse mindestens einen elektrischen Fahrmotor umfasst. Bevorzugt steuert die an der Antriebsachse angeordnete Leistungselektronik den mindestens einen elektrischen Fahrmotor der Antriebsachse an. Hierdurch kann eine Kühlluftführung erzielt werden, bei der der Lüfter der Leistungselektronik Umgebungsluft vor dem Flurförderzeug ansaugt, wodurch eine effektive Kühlung der Leistungselektronik und des Druckmittels der Hydraulikanlage erzielt wird.According to an advantageous embodiment of the invention, the power electronics are arranged on a drive axle of the industrial truck, with the drive axle comprising at least one electric drive motor. The power electronics arranged on the drive axle preferably control the at least one electric drive motor of the drive axle. As a result, a cooling air flow can be achieved in which the fan of the power electronics draws in ambient air in front of the industrial truck, thereby achieving effective cooling of the power electronics and the pressure medium of the hydraulic system.

Der Ölbehälter ist gemäß einer vorteilhaften Ausgestaltungsform der Erfindung in Fahrzeuglängsrichtung des Flurförderzeugs zwischen der Antriebsachse und einem Batteriefach des Flurförderzeugs angeordnet. Dies ermöglicht es, dass der Kühlluftstrom nach Durchströmen der Leistungselektronik den mindestens einen Kühlkörper an dem Ölbehälter auf kurzem Wege von oben nach unten durchströmen kann, wodurch eine effektive Kühlung der Leistungselektronik und des Druckmittels der Hydraulikanlage erzielt wird.According to an advantageous embodiment of the invention, the oil container is arranged in the longitudinal direction of the industrial truck between the drive axle and a battery compartment of the industrial truck. This makes it possible that the cooling air flow after flowing through the power electronics at least one Cooling element on the oil tank can flow through from top to bottom over a short distance, whereby effective cooling of the power electronics and the pressure medium of the hydraulic system is achieved.

Bevorzugt ist der Lüfter der Leistungselektronik als elektrisch betriebener Lüfter ausgebildet. Dies ermöglicht es bei geringem Bauaufwand, den Kühlluftstrom zur Kühlung der Leistungselektronik und des Druckmittels der Hydraulikanlage zu erzeugen.The fan of the power electronics is preferably designed as an electrically operated fan. This makes it possible to generate the cooling air flow for cooling the power electronics and the pressure medium of the hydraulic system with little construction effort.

Weitere Vorteile und Einzelheiten der Erfindung werden anhand des in den schematischen Figuren dargestellten Ausführungsbeispiels näher erläutert. Hierbei zeigt

Figur 1
ein erfindungsgemäßes Flurförderzeug in einer schematischen Seitenansicht und
Figur 2
eine Ansicht gemäß Pfeil A der Figur 1.
Further advantages and details of the invention are explained in more detail using the exemplary embodiment illustrated in the schematic figures. Here shows
figure 1
an industrial truck according to the invention in a schematic side view and
figure 2
a view according to arrow A of figure 1 .

In der Figur 1 ist ein erfindungsgemäßes Flurförderzeug 1 in einer schematischen Seitenansicht dargestellt. Das Flurförderzeug 1 ist im dargestellten Ausführungsbeispiel als Gegengewichtsgabelstapler ausgebildet.In the figure 1 an industrial truck 1 according to the invention is shown in a schematic side view. In the exemplary embodiment shown, the industrial truck 1 is designed as a counterbalanced forklift truck.

Das Flurförderzeug 1 ist im frontseitigen Bereich mit einem Hubgerüst 2 und einem anhebbaren bzw. absenkbaren Lastaufnahmemittel L zur Aufnahme von Lasten versehen. Im heckseitigen Bereich ist das Flurförderzeug 1 mit einem Gegengewicht 3 versehen. Das Flurförderzeug 1 umfasst einen Fahrzeugrahmen 4. An dem Fahrzeugrahmen 4 ist ein nicht näher dargestelltes Fahrerschutzdach bzw. eine Fahrerkabine angeordnet, innerhalb deren sich ein Fahrerarbeitsplatz für eine Bedienperson befindet.The industrial truck 1 is provided in the front area with a mast 2 and a raisable or lowerable load handling device L for picking up loads. The industrial truck 1 is provided with a counterweight 3 in the rear area. The industrial truck 1 comprises a vehicle frame 4. A driver's overhead guard or a driver's cab, not shown in detail, is arranged on the vehicle frame 4, inside which there is a driver's workplace for an operator.

Das Flurförderzeug 1 ist im dargestellten Ausführungsbeispiel im frontseitigen Bereich mit einer Antriebsachse 7 mit angetriebenen Rädern 8 versehen. Im heckseitigen Bereich des Gegengewichts 3 ist ein gelenktes Rad oder eine mit gelenkten Rädern 9 versehene Lenkachse 10 vorgesehen. Die Antriebsachse 7 ist mit einem Fahrantrieb des Flurförderzeugs 1 versehen und umfasst einen in der Antriebsachse 7 angeordneten elektrischen Fahrmotor oder mehrere in der Antriebsachse 7 angeordnete elektrische Fahrmotoren zum Antrieb der Räder 8.In the exemplary embodiment shown, the industrial truck 1 is provided with a drive axle 7 with driven wheels 8 in the front area. A steered wheel or a steering axle 10 provided with steered wheels 9 is provided in the rear area of the counterweight 3 . The drive axle 7 is provided with a travel drive of the industrial truck 1 and includes a drive axle 7 arranged electric traction motor or several in the drive axle 7 arranged electric traction motors for driving the wheels 8.

Zur Steuerung des elektrischen Fahrmotors oder der elektrischen Fahrmotoren ist an der Antriebsachse 7 eine Leistungselektronik 15 angeordnet. Im dargestellten Ausführungsbeispiel ist die Leistungselektronik 15 an der Oberseite der Antriebsachse 7 angeordnet.Power electronics 15 are arranged on the drive axle 7 to control the electric traction motor or the electric traction motors. In the exemplary embodiment shown, the power electronics 15 are arranged on the upper side of the drive axle 7 .

Das Flurförderzeug 1 ist mit einer als Arbeitshydraulik ausgebildeten Hydraulikanlage versehen, die als hydraulische Verbraucher einen Hubantrieb zum Heben und Senken des Lastaufnahmemittels L und zum Neigen des Hubgerüstes 2 umfasst. Weitere hydraulische Verbraucher der Arbeitshydraulik können von Zusatzverbrauchern gebildet sein, beispielsweise einem Seitenschieber für das Lastaufnahmemittel L. Sofern zum Lenken der gelenkten Räder 9 eine hydraulische Lenkungseinrichtung vorgesehen ist, kann die hydraulische Lenkungseinrichtung als weiterer Verbraucher der Arbeitshydraulik vorgesehen werden.The industrial truck 1 is provided with a hydraulic system designed as working hydraulics, which includes a lifting drive for raising and lowering the load handling device L and for tilting the mast 2 as a hydraulic consumer. Further hydraulic consumers of the working hydraulics can be formed by additional consumers, for example a sideshift for the load handling device L. If a hydraulic steering device is provided for steering the steered wheels 9, the hydraulic steering device can be provided as a further consumer of the working hydraulics.

Die Hydraulikanlage umfasst einen Ölbehälter 16.The hydraulic system includes an oil tank 16.

Das Flurförderzeug1 ist im dargestellten Ausführungsbeispiel als batterie-elektrisch betriebenes Flurförderzeug 1 ausgebildet. Zur Versorgung des elektrischen Fahrmotors des Fahrantriebs und eines Elektromotors, der die Hydraulikpumpe der Hydraulikanlage antreibt, ist eine Traktionsbatterie 17 vorgesehen, die in einem Batteriefach 18 des Fahrzeugrahmens 4 angeordnet ist.In the exemplary embodiment shown, the industrial truck 1 is designed as a battery-powered industrial truck 1 . A traction battery 17 , which is arranged in a battery compartment 18 of the vehicle frame 4 , is provided to supply the electric traction motor of the traction drive and an electric motor that drives the hydraulic pump of the hydraulic system.

Der Ölbehälter 16 der Hydraulikanlage ist in Fahrzeuglängsrichtung des Flurförderzeugs zwischen der Antriebsachse 7 und dem Batteriefach 18 des Flurförderzeugs 1 angeordnet.The oil tank 16 of the hydraulic system is arranged in the longitudinal direction of the industrial truck between the drive axle 7 and the battery compartment 18 of the industrial truck 1 .

Im dargestellten Ausführungsbeispiel ist der Ölbehälter 16 Bestandteil des Fahrzeugrahmens 4 des Flurförderzeugs 1 und somit in den Fahrzeugrahmen 4 integriert. Der Ölbehälter 16 ist bevorzugt als rechteckförmiger Kasten des Fahrzeugrahmens 4 ausgebildet, der sich in Fahrzeugquerrichtung erstreckt.In the exemplary embodiment shown, the oil tank 16 is part of the vehicle frame 4 of the industrial truck 1 and is therefore integrated into the vehicle frame 4 . The oil tank 16 is preferably designed as a rectangular box of the vehicle frame 4, which extends in the vehicle transverse direction.

Die Leistungselektronik 15 ist mittels mindestens eines Lüfters 20 gekühlt, der einen die Leistungselektronik 15 kühlenden Kühlluftstrom erzeugt. Der Lüfter 20 ist im dargestellten Ausführungsbeispiel als elektrisch betriebener Lüfter ausgebildet, der an der Antriebsachse 7 bzw. der Leistungselektronik 15 angeordnet ist.The power electronics 15 is cooled by means of at least one fan 20 which generates a flow of cooling air that cools the power electronics 15 . In the exemplary embodiment shown, the fan 20 is designed as an electrically operated fan which is arranged on the drive axle 7 or the power electronics 15 .

Erfindungsgemäß ist der Ölbehälter 16 mit mindestens einem Kühlkörper 25 versehen, der von dem Kühlluftstrom des Lüfters 20 der Leistungselektronik 15 durchströmt ist. Der mindestens eine Kühlkörper 25 ist hierzu thermisch leitend mit dem Ölbehälter 16 verbunden.According to the invention, the oil tank 16 is provided with at least one heat sink 25 through which the cooling air flow of the fan 20 of the power electronics 15 flows. For this purpose, the at least one cooling body 25 is thermally conductively connected to the oil tank 16 .

Im dargestellten Ausführungsbeispiel weist der Ölbehälter 16 eine im Wesentlichen vertikal angeordnete Behälterwand 16a auf, wobei der mindestens eine Kühlkörper 25 an der Behälterwand 16a angeordnet ist und von dem Kühlluftstrom des Lüfters 20 der Leistungselektronik 15 in vertikaler Richtung von oben nach unten durchströmt ist, wie in der Figur 1 anhand der Pfeile 30 verdeutlicht ist. Die vertikal angeordnete Behälterwand 16a ist hierbei die Vorderwand des Ölbehälters 16, die der Leistungselektronik 15 bzw. der Antriebsachse 7 zugewandt ist.In the exemplary embodiment shown, the oil tank 16 has a tank wall 16a arranged essentially vertically, with the at least one heat sink 25 being arranged on the tank wall 16a and the cooling air flow of the fan 20 of the power electronics 15 flowing through it in the vertical direction from top to bottom, as in FIG the figure 1 is illustrated by the arrows 30. The vertically arranged container wall 16a is in this case the front wall of the oil container 16 which faces the power electronics 15 or the drive axle 7 .

Wie in Verbindung mit der Figur 2 ersichtlich ist, ist der der mindestens eine Kühlkörper 25 als Rippenkühlkörper 26 mit vertikal angeordneten Lamellen 27 ausgebildet.As in connection with the figure 2 As can be seen, the at least one heat sink 25 is designed as a ribbed heat sink 26 with vertically arranged fins 27 .

Der mindestens eine Kühlkörper 25 ist im Kühlluftstrom des Lüfters 20 stromab der Leistungselektronik 15 angeordnet.The at least one heat sink 25 is arranged in the cooling air flow of the fan 20 downstream of the power electronics 15 .

Der Lüfter 20 saugt im dargestellten Ausführungsbeispiel in Fahrtrichtung vor dem Flurförderzeug 1 Umgebungsluft an, wie in der Figur 1 mit dem Pfeil 31 verdeutlicht ist, die durch entsprechende, nicht näher dargestellte Kühlkörper der Leistungselektronik 15 geführt wird, um die Leistungselektronik 15 zu kühlen. Die erwärmte Abluft der Kühlung der Leistungselektronik 15 wird anschließend - wie in der Figur 1 von den Pfeilen 30 verdeutlicht ist - von vertikal oben nach unten durch den mindestens einen Kühlkörper 25, der bevorzugt als Rippenkühlkörper 26 mit vertikal angeordneten Lamellen 27 ausgebildet ist, des Ölbehälters 16 geführt, um das Druckmittel der Hydraulikanlage zu kühlen. Die Abluft der Kühlung der Leistungselektronik 15 wird somit durch die vertikal angeordneten Lamellen 27 des Rippenkühlkörpers 26 geführt. Die Kühlluft für die Kühlung des im Ölbehälter 16 befindlichen Druckmittels der Hydraulikanlage wird somit von dem bereits vorhandenen Lüfter 20 der Leistungselektronik 15 bereitgestellt.In the exemplary embodiment shown, the fan 20 sucks in ambient air in front of the industrial truck 1 in the direction of travel, as in FIG figure 1 is illustrated by the arrow 31, which is guided through corresponding heat sinks of the power electronics 15, not shown in detail, in order to cool the power electronics 15. The heated exhaust air cooling the power electronics 15 is then - as in the figure 1 is illustrated by the arrows 30 - guided from vertically top to bottom through the at least one cooling body 25, which is preferably designed as a ribbed cooling body 26 with vertically arranged fins 27, of the oil tank 16 in order to cool the pressure medium of the hydraulic system. The exhaust air from the cooling of the power electronics 15 is thus routed through the vertically arranged fins 27 of the ribbed heat sink 26 . The cooling air for cooling the oil tank 16 located in the pressure medium The hydraulic system is thus provided by the already existing fan 20 of the power electronics 15 .

Die erwärmte Abluft der Kühlung des Ölbehälters 16 strömt anschließend an der Unterseite des Flurförderzeugs 1 zurück in die Umgebung.The heated exhaust air from the cooling of the oil tank 16 then flows back into the environment on the underside of the industrial truck 1 .

Der Kühlkörper 25 kann - wie in der Figur 2 ersichtlich ist - in mehrere Teilkühlkörper aufgeteilt werden bzw. es können ein oder mehrere Kühlkörper 25 an dem Ölbehälter 16 angeordnet werden. Dadurch ist es in kostengünstiger Weise möglich, Flurförderzeuge 1 verschiedener Tragfähigkeitsklassen oder Flurförderzeuge 1 in derselben Tragfähigkeitsklassen, die sich hinsichtlich der Leistungsdichte unterschieden, mit einer angepassten Kühlung des Druckmittels der Hydraulikanlage auszustatten.The heat sink 25 can - as in the figure 2 can be seen - are divided into several partial heat sinks or one or more heat sinks 25 can be arranged on the oil tank 16 . This makes it possible in a cost-effective manner to equip industrial trucks 1 of different load capacity classes or industrial trucks 1 in the same load capacity classes, which differ in terms of power density, with an adapted cooling of the pressure medium of the hydraulic system.

Die Erfindung weist eine Reihe von Vorteilen auf.The invention has a number of advantages.

Bei dem Flurförderzeug 1 kann eine Kühlung des Druckmittels der Hydraulikanlage mit einem einfachen Aufbau in kostengünstiger und energiesparender Weise erzielt werden.In the industrial truck 1, the pressure medium of the hydraulic system can be cooled with a simple structure in a cost-effective and energy-saving manner.

Zur Kühlung des Druckmittels der Hydraulikanlage muss kein Druckmittel von einer Pumpe über eine Verschlauchung zu einem von dem Druckmittel der Hydraulikanlage durchströmter Wärmetauscher, beispielsweise einem Ölkühler umgewälzt werden, wodurch sich eine Energieeinsparung ergibt und kein zusätzlicher Ölkühler, kein zusätzlicher Lüfter an dem Ölkühler und kein zusätzliches Hydraulikventil zur Steuerung des über den Ölkühler strömenden Volumenstroms erforderlich sind. Durch den Entfall eines zusätzlichen Lüfters an dem Ölkühler werden Geräusche verringert und eine Energieeinsparung erzielt. Der Entfall eines Ölkühlers mit der entsprechenden Verschlauchung verringert zudem die Gefahr von Leckagen. Durch den Entfall des von dem Druckmittel der Hydraulikanlage durchströmten Ölkühlers, des Lüfters an dem Ölkühler und der erforderlichen Verschlauchung wird zudem der Montageaufwand des Flurförderzeugs verringert. Darüber hinaus weist die erfindungsgemäße Kühlung des Druckmittels der Hydraulikanlage einen geringen Serviceaufwand auf.To cool the pressure medium of the hydraulic system, no pressure medium has to be circulated from a pump via a hose to a heat exchanger through which the pressure medium of the hydraulic system flows, for example an oil cooler, which results in energy savings and no additional oil cooler, no additional fan on the oil cooler and no additional Hydraulic valve are required to control the flow rate flowing over the oil cooler. By eliminating an additional fan on the oil cooler, noise is reduced and energy is saved. The omission of an oil cooler with the corresponding hoses also reduces the risk of leaks. Due to the elimination of the oil cooler through which the pressure medium of the hydraulic system flows, the fan on the oil cooler and the required tubing, the assembly effort of the industrial truck is also reduced. In addition, the cooling of the pressure medium of the hydraulic system according to the invention requires little servicing.

Zudem kann der mindestens eine Kühlkörper 25 in bauraumsparender Weise an der vertikalen Wand 16a des Ölbehälters 16 angeordnet werden, so dass eine bauraumsparende Kühlung des Druckmittels der Hydraulikanlage erzielt wird.In addition, the at least one cooling body 25 can be arranged in a space-saving manner on the vertical wall 16a of the oil tank 16, so that space-saving cooling of the pressure medium of the hydraulic system is achieved.

Claims (6)

  1. Industrial truck (1), in particular counterbalance forklift truck, having a power electronics system (15) which is cooled by means of at least one fan (20) which generates a cooling air flow which cools the power electronics system (15), and having an oil container (16) of a hydraulic system, characterized in that the oil container (16) is provided with at least one heat sink (25) which is flowed through by the cooling air flow (30) of the fan (20) of the power electronics system (15), wherein the oil container (16) has a substantially vertically arranged container wall (16a), wherein the at least one heat sink (25) is arranged on the container wall (16a) and is flowed through by the cooling air flow (30) of the fan (20) of the power electronics system (15) in a vertical direction from top to bottom, wherein the at least one heat sink (25) is arranged downstream of the power electronics system (15) in the cooling air flow (30) of the fan (20).
  2. Industrial truck according to Claim 1, characterized in that the at least one heat sink (25) is configured in the form of a ribbed heat sink (26) with vertically arranged fins (27).
  3. Industrial truck according to Claim 1 or 2, characterized in that the oil container (16) is a constituent part of a vehicle frame (4) of the industrial truck (1).
  4. Industrial truck according to one of Claims 1 to 3, characterized in that the power electronics system (15) is arranged on a drive axle (7) of the industrial truck (1), wherein the drive axle (7) comprises at least one electric traction motor.
  5. Industrial truck according to Claim 4, characterized in that the oil container (16) is arranged, in a vehicle longitudinal direction of the industrial truck (1), between the drive axle (7) and a battery compartment (18) of the industrial truck (1).
  6. Industrial truck according to one of Claims 1 to 5, characterized in that the fan (20) of the power electronics system (15) is configured in the form of an electrically operated fan.
EP19155223.1A 2018-02-09 2019-02-04 Industrial truck Active EP3524566B1 (en)

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Publication number Priority date Publication date Assignee Title
JP2580925B2 (en) * 1991-01-10 1997-02-12 株式会社豊田自動織機製作所 Forklift engine room
DE102004030560A1 (en) * 2004-06-24 2006-01-19 Linde Ag Industrial truck with battery-powered electrical drive system has pressure medium reservoir in which cooler is integrated
JP5572764B1 (en) * 2013-01-08 2014-08-13 株式会社小松製作所 Battery powered forklift

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