WO1988003123A1 - Arrangement for a hydraulically driven truck - Google Patents

Arrangement for a hydraulically driven truck Download PDF

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Publication number
WO1988003123A1
WO1988003123A1 PCT/SE1987/000486 SE8700486W WO8803123A1 WO 1988003123 A1 WO1988003123 A1 WO 1988003123A1 SE 8700486 W SE8700486 W SE 8700486W WO 8803123 A1 WO8803123 A1 WO 8803123A1
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WO
WIPO (PCT)
Prior art keywords
pump
pressure
hydraulic
devices
lifting
Prior art date
Application number
PCT/SE1987/000486
Other languages
French (fr)
Inventor
Hans-Åke PETTERSSON
Per Göran LARSSON
Original Assignee
Strömsholmens Mekaniska Verkstad Ab
Thoreb Ab
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 Strömsholmens Mekaniska Verkstad Ab, Thoreb Ab filed Critical Strömsholmens Mekaniska Verkstad Ab
Publication of WO1988003123A1 publication Critical patent/WO1988003123A1/en

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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16H—GEARING
    • F16H61/00—Control functions within control units of change-speed- or reversing-gearings for conveying rotary motion ; Control of exclusively fluid gearing, friction gearing, gearings with endless flexible members or other particular types of gearing
    • F16H61/38—Control of exclusively fluid gearing
    • F16H61/40—Control of exclusively fluid gearing hydrostatic
    • F16H61/4078—Fluid exchange between hydrostatic circuits and external sources or consumers
    • F16H61/4096—Fluid exchange between hydrostatic circuits and external sources or consumers with pressure accumulators
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B66—HOISTING; LIFTING; HAULING
    • B66F—HOISTING, LIFTING, HAULING OR PUSHING, NOT OTHERWISE PROVIDED FOR, e.g. DEVICES WHICH APPLY A LIFTING OR PUSHING FORCE DIRECTLY TO THE SURFACE OF A LOAD
    • B66F9/00—Devices for lifting or lowering bulky or heavy goods for loading or unloading purposes
    • B66F9/06—Devices for lifting or lowering bulky or heavy goods for loading or unloading purposes movable, with their loads, on wheels or the like, e.g. fork-lift trucks
    • B66F9/075—Constructional features or details
    • B66F9/20—Means for actuating or controlling masts, platforms, or forks
    • B66F9/22—Hydraulic devices or systems
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
    • F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
    • F15B21/00—Common features of fluid actuator systems; Fluid-pressure actuator systems or details thereof, not covered by any other group of this subclass
    • F15B21/14—Energy-recuperation means
    • 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
    • B60K6/00—Arrangement or mounting of plural diverse prime-movers for mutual or common propulsion, e.g. hybrid propulsion systems comprising electric motors and internal combustion engines ; Control systems therefor, i.e. systems controlling two or more prime movers, or controlling one of these prime movers and any of the transmission, drive or drive units Informative references: mechanical gearings with secondary electric drive F16H3/72; arrangements for handling mechanical energy structurally associated with the dynamo-electric machine H02K7/00; machines comprising structurally interrelated motor and generator parts H02K51/00; dynamo-electric machines not otherwise provided for in H02K see H02K99/00
    • B60K6/08—Prime-movers comprising combustion engines and mechanical or fluid energy storing means
    • B60K6/12—Prime-movers comprising combustion engines and mechanical or fluid energy storing means by means of a chargeable fluidic accumulator
    • 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
    • Y02T10/62—Hybrid vehicles

Definitions

  • the present invention relates to an arrangement for a hydraulicaUy driven truck with devices for the generation of a hydraulic pressure flow including a hydraulic pump, which on its suction side communicates with a low-pressure accumulator and on its pressure side communicates with a high-pressure accumulator, and devices for producing traversing and lifting/lowering movements which are operatively connected to the aforementioned devices for generating the pressure flow, in conjunction with which the aforementioned devices for producing a traversing movement include a hydraulic machine acting as a pump/motor, which is also capable of being regulated and reversed, the shaft of which is operatively connected to the driving wheels of the truck, and is connected between the suction and pressure sides of the hydraulic pump.
  • Materials handling vehicles such as fork—lift trucks, have a dynamic driving pattern with incessant start/stop and lifting/lowering movements.
  • the energy consumption of the vehicle is relatively high, which has an adverse effect on the overall economy of the vehicle.
  • the energy source for the vehicle is an accumulator battery, with a limited amount of available energy and thus a limited operating range or effective working time between battery charges, it is appropriate for the available quantity of energy to be utilized in the most efficient manner possible.
  • the object of the present invention is to increase the effective working time of the vehicle and to improve its overall economy by feeding energy back into the aforementioned devices for generating the pressure . . flow in conjunction with the braking of the vehicle and during lowering movements.
  • the manner in which this is achieved in accordance with the invention is for the aforementioned devices for producing lifting/lowering movements to include two hydraulic machines acting as a pump/motor, which are capable of being reversed and are operatively connected to one another via their shafts in a previously dis-closed manner, of which one, which is capable of being regulated, is connected between the suction and pressure sides of the pump, and the other is connected, on the one hand, to the pressure side of the pump and, on the other hand, via a hydraulic pressure change—over device communicating with the suction side of the pump, to a valve device for actuating cylinder/piston units for the aforementioned lifting/lowering movements.
  • the designation 1 is used in the drawing in respect of a driving arrangement which, via a rotating shaft 9, is operatively connected to a hydraulic pump 2. This is connected on its suction side, via a line 11, to a hydraulic tank 3, for example in the form of a hydraulic accumulator for low working pressures. The pressure side of the pump communicates via a line 14 with a hydraulic accumulator 6 for high working pressures.
  • the designation 12 is used in the drawing in respect of a hydraulic machine, which is capable of being regulated and of being reversed, and which is connected in parallel with the pump 2 via a line 22, which machine is thus able to operate both as a pump and as a motor, and in which the regulation facility can be utilized in order to influence the level of the hydraulic flow through the machine.
  • a machine of this kind may, for example, be an axial piston pump/motor, the pressure disc of which has a variable operating angle.
  • the hydraulic machine 12 is operatively connected via a rotating shaft 15 to the driving wheels 16 of the truck, which are arranged on a shaft 13, preferably the rear axle of the truck.
  • the fact that the hydraulic machine 12 is reversible is indicated on the drawing by means of a bi-directional rotating arrow 18.
  • the designations 4 and 5 are used in the drawing in respect of two hydraulic machines acting as a pump/motor, which are capable of being reversed and are operatively connected via a rotating shaft 17.
  • the fact that the hydraulic machines are reversible is indicated by means of a bi-directional rotating arrow 23.
  • the pump/motor machine 4 is capable of being regulated, that is to say it is of the same kind as the hydraulic machine 12, and is connected in parallel with the pump 2 via a line 19.
  • the hydraulic machine 5 is connected via a line 20, in which a pressure change—over device 10 and a valve system 7 are connected, to a hydraulicaUy operating cylinder/piston 8 with at least two cylinders, the piston rods of which are operatively connected in a conventional manner, which is accordingly not represented in detail, to the lifting forks of the truck for the purpose of raising, lowering and tilting same.
  • Manual actuation of the lever 21 of the hand valve 7 permits tilting or raising/lowering of the lifting forks to be selected.
  • the pressure change—over device 10 the task of which is to halve the hydraulic pressure existing inside the high-pressure accumulator 6, in so doing creating a suitable working pressure for the cylinder/piston unit 8, is connected via a line 22 to the low-pressure accumulator 3.
  • a pressure change—over device of this kind may be provided, for example, by means of two gear— ype pumps which are operatively connected via their shafts, the corresponding inlets to which pumps are connected to the hydraulic machine 5 and to the low-pressure accumulator 3, and the two corresponding outlets from which are connected to the valve system 7.
  • the driving device 1, hydraulic pump 2 and low— and high-pressure accumulators 3 and 6 and their associated lines described above constitute the devices of the truck which generate the pressure flow.
  • Devices for producing the traversing movement of the truck include the hydraulic machine 12, which interacts with the axle 13 and the wheels 16.
  • the hydraulic machines 4 and 5 the pressure change-over device 10
  • the valve system 7 and the cylinder/piston unit 8 can be said to constitute. together with the aforementioned devices for generating the pressure flow, interacting devices for producing lifting/lowering movements of the lifting forks of the truck. The manner in which this interaction takes place in order to utilize the available energy in an optimum fashion is explained below.
  • the drive device 1 causes the pump 2 to pump hydraulic fluid from the low-pressure accumulator into the high—pressure accumulator 6 until the aforementioned pressure has been reached.
  • the hydraulic machine 12 When driving in a straight line, the hydraulic machine 12 is caused to operate as a motor, in which case hydraulic fluid flows from the high—pressure accumulator 6 via the line 22, through the hydraulic machine 12 and into the low-pressure accumulator 3. The pressure in the acccumulator 6 drops in line with this, and as a pre—determined pressure level is reached, the pump 2 is caused to operate in order to restore the aforementioned pressure.
  • the hydraulic machine 12 On braking, the hydraulic machine 12 is caused to operate as a pump, in which case a hydraulic flow is pumped in the opposite direction relative to the above-mentioned flow, and the kinetic energy of the truck is converted into and is stored as a pressure inside the accumulator 6, which pressure can subsequently be used for propulsion.
  • the energy stored inside the accumulator 6 can also be utilized in order to perform a lifting operation by means of the lifting forks actuated by the cylinder/piston unit 8.
  • the valve system 7 is opened with the help of the lever 21, so that a hydraulic flow can pass via the lines 14 and 20, the hydraulic machine 5, which now operates as a motor, and the pressure change-over device 10 and the valve system 7, to the cylinder/piston unit 8.
  • the hydraulic machine 4, which is capable of being regulated, is driven in this way via the shaft 17.
  • the pressure change—over device 10 produces a halving of the pressure inside the accumulator 6 — so that the speed of lifting tends to be too high, this will be braked by regulating the hydraulic machine 4 so as to operate as a pump, in which case hydraulic fluid is pumped from the accumulator 3, via the lines 11, 19 and 14 to the high-pressure accumulator 6. Speed control of this kind operates effectively and with small losses.
  • the hydraulic machine 4 If the weight of the load corresponds to half the pressure inside the accumulator 6, the hydraulic machine 4 is re—set to its neutral position, that is to say it is not regulated so as to act either as a pump or as a motor, and the hydraulic flow through it is then able to pass through with minimal losses. If the load is greater than that which corresponds to half the pressure inside the accumulator 6, the hydraulic machine 4 is regulated so as to operate as a motor, in which case a hydraulic flow flows through it from the accumulator 6, through the lines 14, 19 and 11, and to the accumulator 3. The hydraulic machine 5 in this case operates as a pump which increases the pressure. If the pressure inside the hydraulic accumulator 6 were to fall below the pre-determined value, the pump 2 would be caused to operate under the influence of its driving device 1.
  • the hydraulic machine 4 In conjunction with the lowering, of a heavy load, the hydraulic machine 4 is regulated so as to operate as a pump for the purpose of braking the lowering movement, in which case hydraulic fluid is pumped into the hydraulic accumulator 6, which is the equivalent of storing the released potential energy.
  • the hydraulic machine In the event of the load which is to be lowered not being sufficiently heavy to overcome half the pressure inside , the accumulator 6, the hydraulic machine is regulated so as to operate as a motor and thus to drive the hydraulic machine 5 so that, acting as a pump, it will reduce the input pressure into the cylinder/piston unit 8. It is obvious that the system described above permits the effective regeneration of the kinetic and potential energy which is lost through braking or throttling in conventional systems.

Abstract

The truck has devices (1, 2) for the generation of a hydraulic pressure flow. The aforementioned devices include a hydraulic pump (2), which on its suction side communicates with a low-pressure accumulator (3). On its pressure side the hydraulic pump (2) communicates with a high-pressure accumulator (6). Devices for producing traversing and lifting/lowering movements are operatively connected to the aforementioned devices (1, 2) for generating the pressure flow. The aforementioned devices (12, 13, 15, 16) for producing a traversing movement include a hydraulic machine (12) acting as a pump/motor and capable of being regulated and of being reversed. The shaft (15) of this is operatively connected to the driving wheels (16) of the truck, and is connected between the suction and pressure sides of the hydraulic pump (2). A characterizing feature of the invention is that the aforementioned devices for producing lifting/lowering movements (4, 5, 7, 8, 10) include two hydraulic machines (4, 5) acting as a pump/motor, which are capable of being reversed and are operatively connected to one another via their shafts (17) in a previously disclosed manner. One of these (4), which is capable of being regulated, is connected between the suction and pressure sides of the pump (2). The other (5) is connected, on the one hand, to the pressure side of the pump (2) and, on the other hand, via a hydraulic pressure change-over device (10) communicating with the suction side of the pump (2), to a valve device (7) for actuating cylinder/piston units (8) for the aforementioned lifting/lowering movements.

Description

Arrangement for a hydraulicaUy driven truck
The present invention relates to an arrangement for a hydraulicaUy driven truck with devices for the generation of a hydraulic pressure flow including a hydraulic pump, which on its suction side communicates with a low-pressure accumulator and on its pressure side communicates with a high-pressure accumulator, and devices for producing traversing and lifting/lowering movements which are operatively connected to the aforementioned devices for generating the pressure flow, in conjunction with which the aforementioned devices for producing a traversing movement include a hydraulic machine acting as a pump/motor, which is also capable of being regulated and reversed, the shaft of which is operatively connected to the driving wheels of the truck, and is connected between the suction and pressure sides of the hydraulic pump.
Materials handling vehicles, such as fork—lift trucks, have a dynamic driving pattern with incessant start/stop and lifting/lowering movements. The energy consumption of the vehicle is relatively high, which has an adverse effect on the overall economy of the vehicle. In the case in which the energy source for the vehicle is an accumulator battery, with a limited amount of available energy and thus a limited operating range or effective working time between battery charges, it is appropriate for the available quantity of energy to be utilized in the most efficient manner possible.
The object of the present invention is to increase the effective working time of the vehicle and to improve its overall economy by feeding energy back into the aforementioned devices for generating the pressure .. flow in conjunction with the braking of the vehicle and during lowering movements. The manner in which this is achieved in accordance with the invention is for the aforementioned devices for producing lifting/lowering movements to include two hydraulic machines acting as a pump/motor, which are capable of being reversed and are operatively connected to one another via their shafts in a previously dis-closed manner, of which one, which is capable of being regulated, is connected between the suction and pressure sides of the pump, and the other is connected, on the one hand, to the pressure side of the pump and, on the other hand, via a hydraulic pressure change—over device communicating with the suction side of the pump, to a valve device for actuating cylinder/piston units for the aforementioned lifting/lowering movements.
The invention is described in greater detail below with reference to the accompanying drawing, which illustrates in schematic form the construction of an arrangement in accordance with the invention.
The designation 1 is used in the drawing in respect of a driving arrangement which, via a rotating shaft 9, is operatively connected to a hydraulic pump 2. This is connected on its suction side, via a line 11, to a hydraulic tank 3, for example in the form of a hydraulic accumulator for low working pressures. The pressure side of the pump communicates via a line 14 with a hydraulic accumulator 6 for high working pressures.
The designation 12 is used in the drawing in respect of a hydraulic machine, which is capable of being regulated and of being reversed, and which is connected in parallel with the pump 2 via a line 22, which machine is thus able to operate both as a pump and as a motor, and in which the regulation facility can be utilized in order to influence the level of the hydraulic flow through the machine. A machine of this kind may, for example, be an axial piston pump/motor, the pressure disc of which has a variable operating angle. The hydraulic machine 12 is operatively connected via a rotating shaft 15 to the driving wheels 16 of the truck, which are arranged on a shaft 13, preferably the rear axle of the truck. The fact that the hydraulic machine 12 is reversible is indicated on the drawing by means of a bi-directional rotating arrow 18. The designations 4 and 5 are used in the drawing in respect of two hydraulic machines acting as a pump/motor, which are capable of being reversed and are operatively connected via a rotating shaft 17. The fact that the hydraulic machines are reversible is indicated by means of a bi-directional rotating arrow 23. The pump/motor machine 4 is capable of being regulated, that is to say it is of the same kind as the hydraulic machine 12, and is connected in parallel with the pump 2 via a line 19. The hydraulic machine 5 is connected via a line 20, in which a pressure change—over device 10 and a valve system 7 are connected, to a hydraulicaUy operating cylinder/piston 8 with at least two cylinders, the piston rods of which are operatively connected in a conventional manner, which is accordingly not represented in detail, to the lifting forks of the truck for the purpose of raising, lowering and tilting same. Manual actuation of the lever 21 of the hand valve 7 permits tilting or raising/lowering of the lifting forks to be selected. The pressure change—over device 10, the task of which is to halve the hydraulic pressure existing inside the high-pressure accumulator 6, in so doing creating a suitable working pressure for the cylinder/piston unit 8, is connected via a line 22 to the low-pressure accumulator 3. A pressure change—over device of this kind may be provided, for example, by means of two gear— ype pumps which are operatively connected via their shafts, the corresponding inlets to which pumps are connected to the hydraulic machine 5 and to the low-pressure accumulator 3, and the two corresponding outlets from which are connected to the valve system 7.
The driving device 1, hydraulic pump 2 and low— and high-pressure accumulators 3 and 6 and their associated lines described above constitute the devices of the truck which generate the pressure flow. Devices for producing the traversing movement of the truck include the hydraulic machine 12, which interacts with the axle 13 and the wheels 16. In a corresponding manner the hydraulic machines 4 and 5, the pressure change-over device 10, the valve system 7 and the cylinder/piston unit 8 can be said to constitute. together with the aforementioned devices for generating the pressure flow, interacting devices for producing lifting/lowering movements of the lifting forks of the truck. The manner in which this interaction takes place in order to utilize the available energy in an optimum fashion is explained below.
Omitted from the Figure are those details which are self—evident to an expert, such as safety valves, throttles and circuits for automatically maintaining a certain pressure inside the high—pressure accumulator 6. For this purpose the drive device 1 causes the pump 2 to pump hydraulic fluid from the low-pressure accumulator into the high—pressure accumulator 6 until the aforementioned pressure has been reached.
When driving in a straight line, the hydraulic machine 12 is caused to operate as a motor, in which case hydraulic fluid flows from the high—pressure accumulator 6 via the line 22, through the hydraulic machine 12 and into the low-pressure accumulator 3. The pressure in the acccumulator 6 drops in line with this, and as a pre—determined pressure level is reached, the pump 2 is caused to operate in order to restore the aforementioned pressure.
On braking, the hydraulic machine 12 is caused to operate as a pump, in which case a hydraulic flow is pumped in the opposite direction relative to the above-mentioned flow, and the kinetic energy of the truck is converted into and is stored as a pressure inside the accumulator 6, which pressure can subsequently be used for propulsion.
The energy stored inside the accumulator 6 can also be utilized in order to perform a lifting operation by means of the lifting forks actuated by the cylinder/piston unit 8. For this purpose the valve system 7 is opened with the help of the lever 21, so that a hydraulic flow can pass via the lines 14 and 20, the hydraulic machine 5, which now operates as a motor, and the pressure change-over device 10 and the valve system 7, to the cylinder/piston unit 8. The hydraulic machine 4, which is capable of being regulated, is driven in this way via the shaft 17. If the load is of light weight relative to half the pressure inside the accumulator 6 — the pressure change—over device 10 produces a halving of the pressure inside the accumulator 6 — so that the speed of lifting tends to be too high, this will be braked by regulating the hydraulic machine 4 so as to operate as a pump, in which case hydraulic fluid is pumped from the accumulator 3, via the lines 11, 19 and 14 to the high-pressure accumulator 6. Speed control of this kind operates effectively and with small losses. If the weight of the load corresponds to half the pressure inside the accumulator 6, the hydraulic machine 4 is re—set to its neutral position, that is to say it is not regulated so as to act either as a pump or as a motor, and the hydraulic flow through it is then able to pass through with minimal losses. If the load is greater than that which corresponds to half the pressure inside the accumulator 6, the hydraulic machine 4 is regulated so as to operate as a motor, in which case a hydraulic flow flows through it from the accumulator 6, through the lines 14, 19 and 11, and to the accumulator 3. The hydraulic machine 5 in this case operates as a pump which increases the pressure. If the pressure inside the hydraulic accumulator 6 were to fall below the pre-determined value, the pump 2 would be caused to operate under the influence of its driving device 1.
In conjunction with the lowering, of a heavy load, the hydraulic machine 4 is regulated so as to operate as a pump for the purpose of braking the lowering movement, in which case hydraulic fluid is pumped into the hydraulic accumulator 6, which is the equivalent of storing the released potential energy. In the event of the load which is to be lowered not being sufficiently heavy to overcome half the pressure inside, the accumulator 6, the hydraulic machine is regulated so as to operate as a motor and thus to drive the hydraulic machine 5 so that, acting as a pump, it will reduce the input pressure into the cylinder/piston unit 8. It is obvious that the system described above permits the effective regeneration of the kinetic and potential energy which is lost through braking or throttling in conventional systems. It is also obvious that an expert can make modifications to the arrangement in accordance with the invention within the scope of the idea of invention. Such modifications may involve, for example, the use of a pressure change—over device with a pressure change—over ratio other than that described above, or the execution of the Lining in a different manner.

Claims

Pa t en t C l a i m
Arrangement for a hydraulicaUy driven truck with devices (1, 2) for the generation of a hydraulic pressure flow including a hydraulic pump (2), which on its suction side communicates with a low—pressure accumulator (3) and on its pressure side communicates with a high-pressure accumulator (6), and devices for producing traversing and lifting/lowering movements which are operatively connected to the aforementioned devices (1, 2) for generating the pressure flow, in conjunction with which the aforementioned devices (12, 13, 15, 16) for producing a traversing movement include a hydraulic machine (12) acting as a pump/motor, which is also capable of being regulated and reversed, the shaft (15) of which is operatively connected to the driving wheels (16) of the truck, and is connected between the suction and pressure sides of the hydraulic pump (2), c h a r a c t e i z e d in that the aforementioned devices for producing lifting/lowering movements (4, 5, 7, 8, 10) include two hydraulic machines (4, 5) acting as a pump/motor, which are capable of being reversed and are operatively connected to one another via their shafts (17) in a previously disclosed manner, of which one (4), which is capable of being regulated, is connected between the suction and pressure sides of the pump (2), and the other (5) is connected, on the one hand, to the pressure side of the pump (2) and, on the other hand, via a hydraulic pressure change—over device (10) communicating with the suction side of the pump (2), to a valve device (7) for actuating the cylinder/piston units (8) for the aforementioned lifting/lowering movements.
PCT/SE1987/000486 1986-10-31 1987-10-20 Arrangement for a hydraulically driven truck WO1988003123A1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
SE8604679A SE455864B (en) 1986-10-31 1986-10-31 DEVICE FOR A HYDRAULIC DRIVE TRUCK FOR ENERGY RECOVERY
SE8604679-4 1986-10-31

Publications (1)

Publication Number Publication Date
WO1988003123A1 true WO1988003123A1 (en) 1988-05-05

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PCT/SE1987/000486 WO1988003123A1 (en) 1986-10-31 1987-10-20 Arrangement for a hydraulically driven truck

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WO (1) WO1988003123A1 (en)

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WO1994005583A1 (en) * 1992-08-31 1994-03-17 Captine Pty. Ltd. Multiple ram assembly and recuperative drive system for hydraulic lift
WO1999039936A1 (en) * 1998-02-03 1999-08-12 Tax Technical Consultancy Gmbh Vehicle for displacing loads
FR2825421A1 (en) * 2001-06-05 2002-12-06 Ptc Counter pressure suppressor for hydraulic motor return circuit has hydraulic assist pump with auxiliary motor driven by high pressure fluid feeding the main motor
WO2007071362A1 (en) 2005-12-20 2007-06-28 Bosch Rexroth Ag Vehicle having a drive engine/motor for driving a locomotive drive and a working hydraulic system
WO2008057289A1 (en) * 2006-11-08 2008-05-15 Caterpillar Inc. Bidirectional hydraulic transformer
WO2009066129A1 (en) * 2007-11-22 2009-05-28 Volvo Compact Equipment Sas Construction equipment machine with hydraulic transmission circuit
WO2009083223A2 (en) * 2007-12-28 2009-07-09 Robert Bosch Gmbh Drive system
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US7992484B2 (en) 2004-02-11 2011-08-09 Haldex Hydraulics Corporation Rotary hydraulic machine and controls
WO2012129253A1 (en) * 2011-03-21 2012-09-27 Spicer Off-Highway Belgium N.V. Accumulator assisted hydrostatic driveline and optimization method thereof
JP2013133216A (en) * 2011-12-27 2013-07-08 Mitsubishi Heavy Ind Ltd Industrial vehicle
EP2273133A3 (en) * 2009-07-01 2013-09-04 Hamilton Sundstrand Corporation Active hydraulic regeneration for motion control
US10233949B2 (en) 2011-03-21 2019-03-19 Dana Belgium N.V. Accumulator assisted hydrostatic driveline and optimization method thereof

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SE521308C2 (en) * 1999-12-27 2003-10-21 Bruun Ecomate Ab Mobile handling device with hydraulic circuit

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Cited By (20)

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WO1994005583A1 (en) * 1992-08-31 1994-03-17 Captine Pty. Ltd. Multiple ram assembly and recuperative drive system for hydraulic lift
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SE455864B (en) 1988-08-15
SE8604679D0 (en) 1986-10-31
SE8604679L (en) 1988-05-01

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