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GB2398839A - Electrohydraulic double pump-double motor unit - Google Patents

Electrohydraulic double pump-double motor unit Download PDF

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Publication number
GB2398839A
GB2398839A GB0402403A GB0402403A GB2398839A GB 2398839 A GB2398839 A GB 2398839A GB 0402403 A GB0402403 A GB 0402403A GB 0402403 A GB0402403 A GB 0402403A GB 2398839 A GB2398839 A GB 2398839A
Authority
GB
United Kingdom
Prior art keywords
pump
double
electric motor
electrohydraulic
unit according
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
GB0402403A
Other versions
GB2398839B (en
GB0402403D0 (en
Inventor
Franz Forster
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 GmbH
Original Assignee
Linde 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
Application filed by Linde GmbH filed Critical Linde GmbH
Publication of GB0402403D0 publication Critical patent/GB0402403D0/en
Publication of GB2398839A publication Critical patent/GB2398839A/en
Application granted granted Critical
Publication of GB2398839B publication Critical patent/GB2398839B/en
Anticipated expiration legal-status Critical
Expired - Fee Related legal-status Critical Current

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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
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60K—ARRANGEMENT OR MOUNTING OF PROPULSION UNITS OR OF TRANSMISSIONS IN VEHICLES; ARRANGEMENT OR MOUNTING OF PLURAL DIVERSE PRIME-MOVERS IN VEHICLES; AUXILIARY DRIVES FOR VEHICLES; INSTRUMENTATION OR DASHBOARDS FOR VEHICLES; ARRANGEMENTS IN CONNECTION WITH COOLING, AIR INTAKE, GAS EXHAUST OR FUEL SUPPLY OF PROPULSION UNITS IN VEHICLES
    • B60K17/00—Arrangement or mounting of transmissions in vehicles
    • B60K17/04—Arrangement or mounting of transmissions in vehicles characterised by arrangement, location or kind of gearing
    • B60K17/10—Arrangement or mounting of transmissions in vehicles characterised by arrangement, location or kind of gearing of fluid gearing
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60L—PROPULSION OF ELECTRICALLY-PROPELLED VEHICLES; SUPPLYING ELECTRIC POWER FOR AUXILIARY EQUIPMENT OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRODYNAMIC BRAKE SYSTEMS FOR VEHICLES IN GENERAL; MAGNETIC SUSPENSION OR LEVITATION FOR VEHICLES; MONITORING OPERATING VARIABLES OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRIC SAFETY DEVICES FOR ELECTRICALLY-PROPELLED VEHICLES
    • B60L1/00—Supplying electric power to auxiliary equipment of vehicles
    • B60L1/003—Supplying electric power to auxiliary equipment of vehicles to auxiliary motors, e.g. for pumps, compressors
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60L—PROPULSION OF ELECTRICALLY-PROPELLED VEHICLES; SUPPLYING ELECTRIC POWER FOR AUXILIARY EQUIPMENT OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRODYNAMIC BRAKE SYSTEMS FOR VEHICLES IN GENERAL; MAGNETIC SUSPENSION OR LEVITATION FOR VEHICLES; MONITORING OPERATING VARIABLES OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRIC SAFETY DEVICES FOR ELECTRICALLY-PROPELLED VEHICLES
    • B60L15/00—Methods, circuits, or devices for controlling the traction-motor speed of electrically-propelled vehicles
    • B60L15/20—Methods, circuits, or devices for controlling the traction-motor speed of electrically-propelled vehicles for control of the vehicle or its driving motor to achieve a desired performance, e.g. speed, torque, programmed variation of speed
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60L—PROPULSION OF ELECTRICALLY-PROPELLED VEHICLES; SUPPLYING ELECTRIC POWER FOR AUXILIARY EQUIPMENT OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRODYNAMIC BRAKE SYSTEMS FOR VEHICLES IN GENERAL; MAGNETIC SUSPENSION OR LEVITATION FOR VEHICLES; MONITORING OPERATING VARIABLES OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRIC SAFETY DEVICES FOR ELECTRICALLY-PROPELLED VEHICLES
    • B60L3/00—Electric devices on electrically-propelled vehicles for safety purposes; Monitoring operating variables, e.g. speed, deceleration or energy consumption
    • B60L3/0023—Detecting, eliminating, remedying or compensating for drive train abnormalities, e.g. failures within the drive train
    • B60L3/0061—Detecting, eliminating, remedying or compensating for drive train abnormalities, e.g. failures within the drive train relating to electrical machines
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60L—PROPULSION OF ELECTRICALLY-PROPELLED VEHICLES; SUPPLYING ELECTRIC POWER FOR AUXILIARY EQUIPMENT OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRODYNAMIC BRAKE SYSTEMS FOR VEHICLES IN GENERAL; MAGNETIC SUSPENSION OR LEVITATION FOR VEHICLES; MONITORING OPERATING VARIABLES OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRIC SAFETY DEVICES FOR ELECTRICALLY-PROPELLED VEHICLES
    • B60L50/00—Electric propulsion with power supplied within the vehicle
    • B60L50/50—Electric propulsion with power supplied within the vehicle using propulsion power supplied by batteries or fuel cells
    • B60L50/51—Electric propulsion with power supplied within the vehicle using propulsion power supplied by batteries or fuel cells characterised by AC-motors
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01C—ROTARY-PISTON OR OSCILLATING-PISTON MACHINES OR ENGINES
    • F01C21/00—Component parts, details or accessories not provided for in groups F01C1/00 - F01C20/00
    • F01C21/10—Outer members for co-operation with rotary pistons; Casings
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04C—ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT PUMPS
    • F04C11/00—Combinations of two or more machines or pumps, each being of rotary-piston or oscillating-piston type; Pumping installations
    • F04C11/001—Combinations of two or more machines or pumps, each being of rotary-piston or oscillating-piston type; Pumping installations of similar working principle
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04C—ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT PUMPS
    • F04C15/00—Component parts, details or accessories of machines, pumps or pumping installations, not provided for in groups F04C2/00 - F04C14/00
    • F04C15/0057—Driving elements, brakes, couplings, transmission specially adapted for machines or pumps
    • F04C15/008—Prime movers
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02K—DYNAMO-ELECTRIC MACHINES
    • H02K16/00—Machines with more than one rotor or stator
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02K—DYNAMO-ELECTRIC MACHINES
    • H02K7/00—Arrangements for handling mechanical energy structurally associated with dynamo-electric machines, e.g. structural association with mechanical driving motors or auxiliary dynamo-electric machines
    • H02K7/14—Structural association with mechanical loads, e.g. with hand-held machine tools or fans
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60L—PROPULSION OF ELECTRICALLY-PROPELLED VEHICLES; SUPPLYING ELECTRIC POWER FOR AUXILIARY EQUIPMENT OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRODYNAMIC BRAKE SYSTEMS FOR VEHICLES IN GENERAL; MAGNETIC SUSPENSION OR LEVITATION FOR VEHICLES; MONITORING OPERATING VARIABLES OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRIC SAFETY DEVICES FOR ELECTRICALLY-PROPELLED VEHICLES
    • B60L2200/00—Type of vehicles
    • B60L2200/40—Working vehicles
    • B60L2200/42—Fork lift trucks
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60L—PROPULSION OF ELECTRICALLY-PROPELLED VEHICLES; SUPPLYING ELECTRIC POWER FOR AUXILIARY EQUIPMENT OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRODYNAMIC BRAKE SYSTEMS FOR VEHICLES IN GENERAL; MAGNETIC SUSPENSION OR LEVITATION FOR VEHICLES; MONITORING OPERATING VARIABLES OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRIC SAFETY DEVICES FOR ELECTRICALLY-PROPELLED VEHICLES
    • B60L2220/00—Electrical machine types; Structures or applications thereof
    • B60L2220/10—Electrical machine types
    • B60L2220/12—Induction machines
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60L—PROPULSION OF ELECTRICALLY-PROPELLED VEHICLES; SUPPLYING ELECTRIC POWER FOR AUXILIARY EQUIPMENT OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRODYNAMIC BRAKE SYSTEMS FOR VEHICLES IN GENERAL; MAGNETIC SUSPENSION OR LEVITATION FOR VEHICLES; MONITORING OPERATING VARIABLES OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRIC SAFETY DEVICES FOR ELECTRICALLY-PROPELLED VEHICLES
    • B60L2220/00—Electrical machine types; Structures or applications thereof
    • B60L2220/10—Electrical machine types
    • B60L2220/14—Synchronous machines
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60L—PROPULSION OF ELECTRICALLY-PROPELLED VEHICLES; SUPPLYING ELECTRIC POWER FOR AUXILIARY EQUIPMENT OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRODYNAMIC BRAKE SYSTEMS FOR VEHICLES IN GENERAL; MAGNETIC SUSPENSION OR LEVITATION FOR VEHICLES; MONITORING OPERATING VARIABLES OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRIC SAFETY DEVICES FOR ELECTRICALLY-PROPELLED VEHICLES
    • B60L2220/00—Electrical machine types; Structures or applications thereof
    • B60L2220/40—Electrical machine applications
    • B60L2220/42—Electrical machine applications with use of more than one motor
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60L—PROPULSION OF ELECTRICALLY-PROPELLED VEHICLES; SUPPLYING ELECTRIC POWER FOR AUXILIARY EQUIPMENT OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRODYNAMIC BRAKE SYSTEMS FOR VEHICLES IN GENERAL; MAGNETIC SUSPENSION OR LEVITATION FOR VEHICLES; MONITORING OPERATING VARIABLES OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRIC SAFETY DEVICES FOR ELECTRICALLY-PROPELLED VEHICLES
    • B60L2240/00—Control parameters of input or output; Target parameters
    • B60L2240/10—Vehicle control parameters
    • B60L2240/36—Temperature of vehicle components or parts
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60L—PROPULSION OF ELECTRICALLY-PROPELLED VEHICLES; SUPPLYING ELECTRIC POWER FOR AUXILIARY EQUIPMENT OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRODYNAMIC BRAKE SYSTEMS FOR VEHICLES IN GENERAL; MAGNETIC SUSPENSION OR LEVITATION FOR VEHICLES; MONITORING OPERATING VARIABLES OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRIC SAFETY DEVICES FOR ELECTRICALLY-PROPELLED VEHICLES
    • B60L2240/00—Control parameters of input or output; Target parameters
    • B60L2240/40—Drive Train control parameters
    • B60L2240/42—Drive Train control parameters related to electric machines
    • B60L2240/421—Speed
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60L—PROPULSION OF ELECTRICALLY-PROPELLED VEHICLES; SUPPLYING ELECTRIC POWER FOR AUXILIARY EQUIPMENT OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRODYNAMIC BRAKE SYSTEMS FOR VEHICLES IN GENERAL; MAGNETIC SUSPENSION OR LEVITATION FOR VEHICLES; MONITORING OPERATING VARIABLES OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRIC SAFETY DEVICES FOR ELECTRICALLY-PROPELLED VEHICLES
    • B60L2240/00—Control parameters of input or output; Target parameters
    • B60L2240/40—Drive Train control parameters
    • B60L2240/42—Drive Train control parameters related to electric machines
    • B60L2240/425—Temperature
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60Y—INDEXING SCHEME RELATING TO ASPECTS CROSS-CUTTING VEHICLE TECHNOLOGY
    • B60Y2200/00—Type of vehicle
    • B60Y2200/10—Road Vehicles
    • B60Y2200/15—Fork lift trucks, Industrial trucks
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04C—ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT PUMPS
    • F04C15/00—Component parts, details or accessories of machines, pumps or pumping installations, not provided for in groups F04C2/00 - F04C14/00
    • F04C15/0096—Heating; Cooling
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F05—INDEXING SCHEMES RELATING TO ENGINES OR PUMPS IN VARIOUS SUBCLASSES OF CLASSES F01-F04
    • F05C—INDEXING SCHEME RELATING TO MATERIALS, MATERIAL PROPERTIES OR MATERIAL CHARACTERISTICS FOR MACHINES, ENGINES OR PUMPS OTHER THAN NON-POSITIVE-DISPLACEMENT MACHINES OR ENGINES
    • F05C2201/00—Metals
    • F05C2201/02—Light metals
    • F05C2201/021—Aluminium
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
    • Y02P90/00—Enabling technologies with a potential contribution to greenhouse gas [GHG] emissions mitigation
    • Y02P90/60—Electric or hybrid propulsion means for production processes
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
    • Y02T10/00—Road transport of goods or passengers
    • Y02T10/60—Other road transportation technologies with climate change mitigation effect
    • Y02T10/64—Electric machine technologies in electromobility
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
    • Y02T10/00—Road transport of goods or passengers
    • Y02T10/60—Other road transportation technologies with climate change mitigation effect
    • Y02T10/70—Energy storage systems for electromobility, e.g. batteries
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
    • Y02T10/00—Road transport of goods or passengers
    • Y02T10/60—Other road transportation technologies with climate change mitigation effect
    • Y02T10/72—Electric energy management in electromobility

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Power Engineering (AREA)
  • Transportation (AREA)
  • General Engineering & Computer Science (AREA)
  • Structural Engineering (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Civil Engineering (AREA)
  • Geology (AREA)
  • Sustainable Development (AREA)
  • Sustainable Energy (AREA)
  • Details And Applications Of Rotary Liquid Pumps (AREA)
  • Rotary Pumps (AREA)
  • Motor Or Generator Frames (AREA)
  • Connection Of Motors, Electrical Generators, Mechanical Devices, And The Like (AREA)

Abstract

An electrohydraulic double pump-double motor unit for an automotive machine, e.g. a forklift, comprises first pump P1 driven by rotor R1 of first electric motor E1, and a second pump P2 driven by rotor R2 of second electric motor E2 coaxial to the first motor. To simplify construction and optimise cooling the motor rotors are arranged in series one behind the other and at least one pump is arranged axially between the end face of the first motor, remote from the second motor, and a power control device S. Pump housing G is provided here in contact with heat-emitting/conducting components of the first motor and the power control device and is made from thermally conductive material e.g aluminium alloy. The first pump is connected to hydraulic operating equipment and the second to hydraulic steering equipment.

Description

Electrohydraulic double pump-double motor unit for an automotive machine,
in particular an industrial truck The invention relates to an electrohydraulic double pump-double motor unit for an automotive machine, in particular an industrial truck, comprising a first pump which can be driven by a rotor of a first electric motor, and comprising a second pump, which can be driven by a rotor of a second electric motor coaxial to the first electric motor.
DE 101 12 500 A1 discloses a generic electrohydraulic double pump-double motor unit. In this case the second electric motor is located radially inside the rotor of the first electric motor. The first pump driven by the first (outer) electric motor substantially serves to supply hydraulic operating equipment. The second pump driven by the second (inner) electric motor has a smaller delivery volume and is provided to supply hydraulic steering equipment.
The arrangement known from said document is extremely compact owing to the combination of the constructional components mentioned at the outset, but owing to the oil cooling of the two electric motors by channels arranged between the first and the second electric motor, requires a certain outlay, to ensure that no oil penetrates into the electric motors. The indication, which is kept general, can be inferred from the document, that the control device (the heat-emitting power control device is meant here) of the two electric motors can also be cooled by the oil cooling.
The control device should be flanged to the double pump-double motor unit here.
The object of the present invention is to provide a double pump-double motor unit of the type mentioned at the outset with simplified construction and optimised cooling.
Therefore, according to the present invention, an electrohydraulic double pump-double motor unit for an automotive machine, in particular an industrial truck, comprises a first pump, which is driven by a rotor of a first electric motor, and comprising a second pump which is driven by a rotor of a second electric motor coaxial to the first electric motor, characterized in that the rotors of the two electric motors are arranged in series one behind the other and at least one of the pumps is arranged axially between the end face of the first electric motor remote from the second electric motor and a power control device The concept essential to the invention consists in not fitting the two electric motors into each other, but arranging them one behind the other, one or both pumps being arranged on one of the end faces of this subassembly adjoined by the power control device. This may be a power control device for one or both electric motors consisting of one or more control modules.
Therefore, according to the invention, the liquid stream of the pump(s) does not only cool the electric motor(s) but also the control module(s) of the power control device. In this case the power control device is located at the coolest point of the double pump-double motor unit. The power control device is cooled by the oil stream flowing through the pump(s) and is also exposed to the ambient air which can also be used for cooling.
To achieve heat conduction which is as good as possible and therefore results in rapid dissipation of the heat lost from the double pump-double motor unit, according to an advantageous configuration of the invention, a pump housing is provided which is directly or indirectly in surface contact with heat-emitting and/or heat-conducting components of the first electric motor and the power control device.
It is advantageous in this context if the rotor of the first electric motor is rotatably mounted in the pump housing in a support component fastened in a planar manner on the pump housing. The rotor heat can thus discharge via the bearing into the pump housing and be conveyed away by the delivery stream of the pump(s). The temperature of the constructional components in the region of the bearing, for example roller bearings, rotary shaft seals, etc., therefore remains below the maximum temperature loading capacity.
Therefore, in terms of production engineering, a configuration is advantageous in which the support component is designed as a lateral cover of the pump housing.
To further improve the heat transfer from the first electric motor to the pump housing, the housing of the first electric motor can be formed on the pump housing.
There is then not only an optimum heat transfer from the rotor but also from the stator of the electric motor to the pump housing.
If the pump housing consists of a material with high heat conductivity, heat conveyance and heat dissipation are facilitated and therefore cooling of the double pump-double motor unit according to the invention is improved.
For this purpose, the pump housing advantageously consists of aluminium or an aluminium alloy. This has an advantageous effect on the production process, as the outlay for time, energy and tools for the machining of the pump housing is therefore considerably less than in the case of machining of iron materials.
Depending on the design of the double pump-double motor unit according to the invention it may be sufficient to arrange only one pump in the pump housing. The other pump is then preferably arranged on the end face of the second electric motor which is remote from the first electric motor. This design may be advantageous when the second electric motor and the second pump are relatively small and/or the second electric motor generates only relatively little heat loss.
In a preferred development of the invention, it is proposed that the two pumps be arranged parallel to one another in the pump housing, the rotor of the first electric motor having a hollow shaft, through which a shaft connecting the rotor of the second electric motor to the second pump is guided. The liquid streams of the two pumps can then be used to cool the double pump-double motor unit.
In this case it is advantageous for at least one of the pumps, for example the (smaller) second pump which can be provided to supply hydraulic steering equipment, is almost continuously in operation, so an adequate oil stream is always available for heat dissipation from the double pump-double motor unit.
It is also possible for the first and/or the second pump, in operating states in which they are not driven as the loads to be supplied are not triggered, to be set into operation by a switch which is controllable as a function of temperature and is in operative connection with the first and/or the second electric motor.
The two pumps advantageously have a common suction channel. Only one hydraulic suction line is then required which leads to the double pumpdouble motor I unit according to the invention.
The space requirement in the axial direction is minimised if the first pump! projects axially at least partially into the first electric motor. In this case, the pump housing may advantageously be designed as an end shield of the first electric motor.
A configuration of the invention in which the second electric motor projects axially, at least partially, into the first electric motor serves the same purpose.
Analogously, the second electric motor may also be designed here as an end shield of the first electric motor.
In this context, a development of the invention proves favourable, in which axial recesses are provided at both end faces of the rotor of the first electric motor.
The first pump and the second electric motor project into these recesses. The axial dimensions of the double pump-double motor unit are thus minimised.
It is advantageous for an integration of the first pump and the second electric motor into the first electric motor if the first electric motor is designed as a three- phase synchronous motor. By virtue of the type of construction, a synchronous motor has a relatively larger diameter than an asynchronous motor, so sufficient space is available within the motor to partially integrate components of the double pump- double motor unit according to the invention into the first electric motor. Moreover, a synchronous motor is relatively short in the axial direction. Furthermore, it is advantageous in the use of a synchronous motor for the power to be greater and the losses less with the same constructional space, than in asynchronous motors.
However, it should not therefore be ruled out that other suitable electric motors may also be used.
The second electric motor may also be designed as a synchronous motor. A configuration is also possible in which the second electric motor is designed as an axial field motor. "Disc armature motors" of this type are extremely compact, in particular, in the axial direction. If the second pump has a significantly smaller delivery volume than the first pump and accordingly - in comparison to the first pump - requires a smaller drive power, a compact disc armature motor may be adequate as the drive. ! A further configuration of the invention provides that at least one valve is integrated into the pump housing.
The pumps are expediently designed as gear pumps, in particular as annular gear pumps.
If the double pump-double motor unit is provided with a fastening flange, this may be fastened in a simple manner to a point on the machine which is suitable for this.
A configuration of the invention in which the first pump is connected to hydraulic operating equipment and the second pump is connected to hydraulic! steering equipment is particularly favourable.
The double pump-double motor unit according to the invention may, according to a further advantageous configuration, be at least partially integrated into the housing of a drive axle having at least one travel motor. A machine is thus provided! in which all essential drives, namely the travel drive, the drive for the hydraulic i operating equipment and the drive for the hydraulic steering equipment are combined into one overall subassembly. Moreover, it is possible to cool not only the first and the second electric motor by the delivery stream of the pump(s) but also the travel motor and the power control device thereof.
Further advantages and details of the invention will be described in more detail with the aid of the embodiment shown in the figures, in which: Fig. 1 shows a perspective view of an automotive machine designed as an industrial truck; and Fig. 2 shows a longitudinal section through an electrohydraulic double pump- double motor unit of the industrial truck according to the invention.
Fig. 1 shows an automative machine which is designed as a batteryelectric counterweight forklift truck and hydraulic operating equipment (lifting cylinder and inclining cylinder of a lifting frame M arranged at the front) and hydraulic steering equipment (actuation of a rear steering axle L).
The double pump-double motor unit shown in Fig. 2 is provided to supply the two mentioned systems. This double pump-double motor unit consists of a first electric motor E1 with a rotor R1 which drives a first pump P1 and a second electric I motor E2 coaxial to the first electric motor E1, with a rotor R2 which drives a second pump P2. The first pump P1 is connected in the present embodiment to the hydraulic operating equipment of the industrial truck, while the second pump P2 is connected to the hydraulic steering equipment. The pumps P1 and P2 are designed as annular gear pumps and combine to form one constructional unit with the electric motors E1 and E2 in the manner described hereinafter.
The rotors R1 and R2 of the two electric motors E1 and E2 are arranged in! series one behind the other. The rotor R1 of the first electric motor E1 has a hollow i shaft H here, through which a shaft W rigidly connected to the rotor R2 of the second electric motor E2is guided. On the end face of the first electric motor E1 which opposes the second electric motor E2, in other words on the right in the figure, a pump housing G is located, in which the two pumps P1 and P2 are arranged parallel to one another. The pump P1 adjoining the first electric motor E1is coupled to the rotor R1 thereof. The second pump P2is in drive connection via the shaft W with the rotor R2 of the second electric motor E2.
In the present embodiment, the first electric motor E1is designed as a three- phase synchronous motor having an adequately large diameter to accommodate in its interior, in a space-saving manner, on the one hand, the first pump P1 and, on the other hand, also to substantially integrate the second electric motor E2 (see left-hand side of Fig. 2). The rotor R1 of the first electric motor E1is provided for this purpose with axial recesses on both end faces, into which project, on the one end face, the first pump P1 and, on the other end face, the second electric motor E2. In this case, the housing of the electric motor E2 and the pump housing G each serve as an end shield of the electric motor E1.
The second electric motor E2 in the present embodiment is also designed as a synchronous motor, here as a radial field motor. It is also possible to provide an axial field motor (disc armature motor) as the second electric motor E2.
The pump housing G has a common suction channel K for the two pumps P1 and P2 and pressure channels D1 and D2 which are separate from one another.
Valves, not shown in the figures, which are connected into the pressure channels D1 and D2 may be arranged inside the pump housing G. On the side of the pump housing which is on the right in Fig. 2, a power control device S. shown by a dot-dash line, is fastened in a planar manner and preferably controls the two electric motors E1 and E2.
The heat losses from the electric motors E1 and E2 and the power control device S is dissipated by the liquid stream delivered by the pumps P1 and P2. To achieve optimization, here a plurality of measures are provided: À The pump housing G consists of material with good heat conductivity, in particular aluminium or an aluminium alloy. This material can also be easily machined in terms of production engineering.
À The rotor R1 of the first electric motor E1 is rotatably mounted on the right- hand end in the figure in a support component B fasted in a planar manner on the pump housing G (the support component B is designed as a lateral cover of the pump housing G). The rotor heat can thus discharge via the hollow shaft H and the bearing in the support component B into the pump housing G and be conveyed away by the delivery stream of the pumps P1 and P2.
À Contrary to the view in Fig. 2, it is possible for the housing of the first electric motor E1 to be formed on the pump housing G to also achieve in the stator region, an optimum heat transfer to the pump housing G. À The power control device S is connected in a planar manner to the pump housing G so good contact is produced between the pump housing G and the heat-emitting components of the power control S. The already mentioned support component B closes an aperture in the pump housing G behind which the first pump P1 is located. Provided on the opposite side of the pump housing G is an aperture behind which the second pump P2 is arranged and which is covered by a plate C. An axial projection (shown by a dot-dash line) of I the shaft W can be guided through this plate to cooperate with a rotational speed sensor inside the power control device S. Leading to the double pump-double motor unit according to the invention are only a suction line and the two pressure lines of the pumps P1 and P2 as well as an electric power line with a plug-type connection for the electric terminals of the power control device S and the two electric motors E1 and E2.
The double pump-double motor unit according to the invention may be fastened with the aid of a fastening flange F. which is formed on the housing of the first electric motor E1, to a suitable point of the industrial truck.
However, it is also possible to at least partially integrate the double pump- double motor unit into the housing of a driving axle which has at least one travel motor. In this case, an independent housing of the first electric motor E1 can optionally be dispensed with and the environment inside the housing of the driving I axle also used.

Claims (20)

  1. Claims 1. An electrohydraulic double pump-double motor unit for an
    automotive machine, in particular an industrial truck, comprising a first pump, which is driven by a rotor of a first electric motor, and comprising a second pump which is driven by a rotor of a second electric motor coaxial to the first electric motor, characterized in that the rotors of the two electric motors are arranged in series one behind the other and at least one of the pumps is arranged axially between the end face of the first electric motor remote from the second electric motor and a power control device.
  2. 2. An electrohydraulic double pump-double motor unit according to claim 1, characterized in that a pump housing is provided which is directly or indirectly in surface contact with heat-emitting and/or heat-conducting components of the first I electric motor and the power control device.
  3. 3. An electrohydraulic double pump-double motor unit according to claim 1 or 2, characterized in that the rotor of the first electric motor is rotatably mounted in: the pump housing or in a support component fastened in a planar manner to the: pump housing.
  4. 4. An electrohydraulic double pump-double motor unit according to claim 3, characterized in that the support component is designed as a lateral cover of the pump housing.
  5. 5. An electrohydraulic double pump-double motor unit according to any one of claims 1 to 4, characterized in that the housing of the first electric motor is formed I on the pump housing.
  6. 6. An electrohydraulic double pump-double motor unit according to any one of claims 1 to 5, characterized in that the pump housing consists of a material with a high heat conductivity.
  7. 7. An electrohydraulic double pump-double motor unit according to any one of claims 1 to 6, characterised in that the pump housing consists of aluminium or an aluminium alloy.
  8. 8. An electrohydraulic double pump-double motor unit according to any one of claims 1 to 7, characterised in that the two pumps are arranged parallel to one another in the pump housing, the rotor of the first electric motor having a hollow shaft through which a shaft connecting the rotor of the second electric motor to the second pump is guided.
  9. 9. An electrohydraulic double pump-double motor unit according to claim 8, characterised in that the two pumps have a common suction channel.
  10. 10. An electrohydraulic double pump-double motor unit according to any one of claims 1 to 9, characterised in that the first pump projects axially, at least partially, into the first electric motor.
  11. 11. An electrohydraulic double pump-double motor unit according to claim 10, characterised in that the pump housing is designed as an end shield of the first electric motor.
  12. 12. An electrohydraulic double pump-double motor unit according to any one of claims 1 to 10, characterised in that the second electric motor projects axially, at least partially, into the first electric motor.
  13. 13. An electrohydraulic double pump-double motor unit according to claim 12, characterised in that the second electric motor is designed as an end shield of the first electric motor.
  14. 14. An electrohydraulic double pump-double motor unit according to any one of claims 10 to 13, characterised in that axial recesses are provided on the two end faces of the rotor of the first electric motor.
  15. 15. An electrohydraulic double pump-double motor unit according to any one of claims 1 to 14, characterized in that the first electric motor is designed as a three- phase synchronous motor.
  16. 16. An electrohydraulic double pump-double motor unit according to any one of claims 1 to 15, characterized in that at least one valve is integrated into the pump housing.
  17. 17. An electrohydraulic double pump-double motor unit according to any one of claims 1 to 16, characterized in that the pumps are designed as annular gear pumps.
  18. 18. An electrohydraulic double pump-double motor unit according to any one of claims 1 to 17, characterized in that the double pump-double motor unit is provided with a fastening flange.
  19. 19. An electrohydraulic double pump-double motor unit according to any one of claims 1 to 18, characterized in that the first pump is connected to hydraulic operating equipment and the second pump is connected to hydraulic steering equipment.
  20. 20. Electrohydraulic double pump-double motor unit according to any one of claims 1 to 19, characterized by the at least partial integration into the housing of a driving axle which has at least one travel motor.
GB0402403A 2003-02-22 2004-02-04 Electrohydraulic double pump-double motor unit for an automotive machine,in particular an industrial truck Expired - Fee Related GB2398839B (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE10307566A DE10307566A1 (en) 2003-02-22 2003-02-22 Electrohydraulic double-pump, double-motor unit for a self-propelled work machine, especially an industrial truck

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GB0402403D0 GB0402403D0 (en) 2004-03-10
GB2398839A true GB2398839A (en) 2004-09-01
GB2398839B GB2398839B (en) 2006-05-03

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JP (1) JP4488491B2 (en)
DE (1) DE10307566A1 (en)
FR (1) FR2851621B1 (en)
GB (1) GB2398839B (en)

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DE102016113366A1 (en) * 2016-07-20 2018-01-25 Weber-Hydraulik Gmbh hydraulic power unit
DE102019130719A1 (en) * 2019-11-14 2021-05-20 Fte Automotive Gmbh Liquid pump
DE102021103815A1 (en) 2021-02-18 2022-08-18 Knorr-Bremse Systeme für Nutzfahrzeuge GmbH Pump device for a steering device of a vehicle, steering device and method and device for producing a pump device
DE102021103811A1 (en) 2021-02-18 2022-08-18 Knorr-Bremse Systeme für Nutzfahrzeuge GmbH Electrohydraulic power steering device for a vehicle
CN113300557B (en) * 2021-06-29 2025-09-02 美的威灵电机技术（上海）有限公司 Motors, fans and household appliances
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Also Published As

Publication number Publication date
FR2851621B1 (en) 2006-01-13
GB2398839B (en) 2006-05-03
FR2851621A1 (en) 2004-08-27
JP4488491B2 (en) 2010-06-23
JP2004251283A (en) 2004-09-09
DE10307566A1 (en) 2004-09-02
GB0402403D0 (en) 2004-03-10

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Effective date: 20100204