• 专利附录
  • 专利说明
  • 权利要求
  • 类似技术
  • 同族专利
  • 引用文献
  • 法律状态
  • 优先权
    • 专利摘要:
    The invention relates to a device for recovering hydraulic energy in a working machine, with at least a first differential cylinder piston device (100) with a differential cylinder (1) and piston rod sides (2). and piston head (3) separated, and with at least one hydraulic accumulator (16) which is adapted to be hydraulically connected to the differential cylinder piston device (100), the potential energy of the differential cylinder piston device (100) in retraction under a thrust load that can be stored at least partially in the hydraulic accumulator (16) and the piston rod (2) and piston crown (3) sides being adapted to be connected to each other. other by a brake valve (6) for the return of hydraulic fluid from the piston head (3) to the piston rod (2) side. The invention also relates to a working machine, in particular wheel loader, excavator or crane, with such a device for recovering hydraulic energy.
    公开号:FR3052826A1
    申请号:FR1700643
    申请日:2017-06-15
    公开日:2017-12-22
    发明作者:Philipp Hahn；Volker Gliniorz；Guillaume Bonnetot
    申请人:Liebherr Mining Equipment Colmar SAS；
    IPC主号:
    专利说明:

    DEVICE FOR RECOVERING HYDRAULIC ENERGY IN A WORKING MACHINE
    The invention relates to a device for recovering hydraulic energy in a working machine, with at least a first differential piston piston device with a differential cylinder and piston rod sides and separate piston head, with at least one hydraulic accumulator which is adapted to be hydraulically connected to the differential cylinder piston device, the potential energy of the retractable differential piston piston device under a thrust load can be stored at least partially in the hydraulic accumulator and the piston rod and piston head sides being adapted to be connected to each other by a brake valve for the return of hydraulic fluid from the piston head side to the piston rod side.
    In known actuations of cylinders in particular in mobile working machines, the retraction of the cylinders under thrust load, for example when the arm or a lift cylinder is lowered without pressure, is implemented by a command throttle. In this case, the potential energy that is defined by the load acting on the cylinder, is transformed into heat by the constriction of the volume flow that is under pressure. By this action, existing potential energy is destroyed. Because of the need for heat transfer, it is necessary to provide additional cooling power to the interior of the machine.
    A common embodiment of the cylinders in mobile working machines is the differential cylinder. When the latter is retracted with a throttle and a thrust load, it must be ensured that a filling of the cylinder chamber on the side of the piston rod is guaranteed. This is possible by injecting a corresponding feed volume flow through the work pumps; on the other hand, additional filling of the cylinder chambers on the piston rod side can be effected by a return of the strangled volume flow. By the return of the throttled volume flow, this volume flow is divided according to the ratio of the surfaces between the piston rod side and the piston head side of the jack or jacks. Here, a portion of the volume flow passes into the chambers of the piston rod side of the cylinders and the other part is conducted into the tank.
    If the potential energy inherent in the lowering action of the cylinders must be stored, the interest of such an action lies in trying to store as much of the energy as possible. In hydraulic engineering, this corresponds to as much oil as possible under the greatest possible pressure. The hydraulic actuations known from the state of the art, which implement the return of a portion of the volume flow of the piston head side into the piston rod side chambers of the cylinders, reduce the volume flow that can be available to be stored.
    Currently, various solutions for storing potential energy during a lowering of the boom of mobile hydraulic working machines are known. Are known, for example, devices in which one of two cylinders is used to store energy. Here, a discharge machine is used in closed circuit, to fill, in a complementary manner, the chambers of the piston rod side of the two cylinders with the return amount of the second cylinder. A disadvantage of this type of device is the absence of an oil replacement on the piston head side of the cylinder which is connected to the storage element. The volume of oil is moved only between the hydraulic accumulator and the piston head side of the cylinder.
    [0006] Also known are devices in which a hydraulic pump is used during (retraction of the cylinders, to ensure the filling of the chambers on the piston rod side.) The additional filling by hydraulic power supply does not correspond. not to an efficient control in energy of the hydraulic consumers.
    Similarly, is also known the receipt of the potential energy of the arrow by a cylinder filled with gas. In the context of such devices, the additional integration of a gas cylinder in the machine is necessary, which constitutes a disadvantageously high integration effort. In addition, the storage volume of the gas cylinder must be provided for the complete lifting of the drive, even if, during a normal work mission, the complete lifting is not used.
    For the injection of the stored hydraulic energy, devices are known in which a direct injection of energy into the fan circuit of the machine is carried out. Depending on the working point of the fan circuit, it is necessary to brake the volume flow from the hydraulic accumulator to the fan circuit. In this case, throttling losses are caused and thus the amount of reusable hydraulic energy is reduced.
    In addition, it is known to directly reuse the stored hydraulic energy for the supply of the working pumps. Here, a circuit is needed which connects the suction side of the working pump to either the hydraulic tank or the hydraulic accumulator. If the pump is not powered via the hydraulic accumulator, losses appear by the valve which influence the suction vacuum of the pump and which can thus cause unfavorable conditions of operation. In addition, cooling and filtering must be provided between the hydraulic accumulator and the suction of the working pump.
    Correspondingly, the known circuits have three disadvantages: 1. The potential energy of the lifting / lowering action is annihilated by the throttling action and can not be used for other processes . 2. The potential energy of the lifting / lowering action is introduced into the hydraulic system as thermal energy and must be dissipated again by corresponding cooling devices. These processes also consume energy. 3. The distribution of the volume flow on the piston head side when lowering the levaae levers results in a reduction in the potential potential of stored energy.
    For this, the object of the invention is to store the potential energy that is defined by the load on the cylinder or cylinders and ensure at the same time an additional filling energy efficient rooms on the side piston rod of the cylinders.
    The object is achieved according to the invention by a device for recovering hydraulic energy in a working machine, which has the following characteristics. There is provided a device with at least a first differential cylinder piston device with a differential cylinder and separate piston rod and piston head sides, which further comprises at least one hydraulic accumulator which is adapted to be hydraulically connected. to the differential cylinder piston device. The device is configured so that the potential energy of the retractable differential piston piston device under a boost load can be stored at least partially in the hydraulic accumulator and that the piston rod and piston head sides can be adapted to can be connected to each other by a brake valve for the return of hydraulic fluid from the piston head side to the piston rod side.
    [0013] Advantageously, the potential energy taken from the differential cylinder piston device can be stored first and then used in another operating state of the device to operate the work machine. By this is maximized the amount of potential energy that can be stored which can be used for other tasks inside the working machine. In addition, the large cooling capacity can be reduced since less heat losses must be dissipated inside the machine by the cooling system. On this basis, the entire operation of the hydraulic working machine can be made more energy efficient.
    According to a particularly advantageous embodiment of the invention, it is conceivable that the hydraulic accumulator is hydraulically connected to more than said differential cylinder piston device. It can thus be provided that other differential cylinder piston devices of the working machine transmit the potential energy they contain to said at least one hydraulic accumulator. Thus, it is conceivable that, for better energy recovery, different differential cylinder piston devices of a working machine are connected to the hydraulic accumulator or the hydraulic storage elements. Correspondingly, a higher percentage of energy recovery can be obtained.
    According to another preferred embodiment, it is conceivable that a support motor is provided which is configured to inject the hydraulic energy stored in the hydraulic accumulator in a drive line of the working machine and recover it well, the support motor being likely to be connected to the hydraulic accumulator including via a support motor valve. Advantageously, the energy stored in the hydraulic accumulator can be used to support (assist) a primary drive source such as a diesel engine or an electric motor of your work machine, by injecting energy through the support motor in the drive line of the machine.
    According to another preferred embodiment, it is conceivable that the differential cylinder piston devices are arranged for operation in parallel with each other. In addition, it may be provided in another preferred embodiment, at least one working pump for driving the differential cylinder piston device is provided and / or at least one control valve for controlling the a differential cylinder piston device is provided and / or at least one reservoir is provided and / or a hydraulic accumulator valve is provided for closing the hydraulic accumulator with respect to the differential piston device. The advantages of the stated embodiments result from the figure description hereinafter.
    According to a particularly preferred embodiment, it is conceivable that a connecting valve for closing the piston head side with respect to the piston rod side of the differential cylinder piston device is provided. It is also conceivable that, by closing the piston head side with respect to the piston rod side, a pressure increase is effected.
    The invention also relates to a working machine, including wheel loader, excavator or crane, with a device for recovering hydraulic energy as described above. More particularly preferably, it can be provided that the working machine is configured to be able to operate unhindered on other functions when the direct hydraulic energy recovery device is faulty.
    It is also possible to provide additional energy on the work machine, the machine also having without the device of the invention all the actuators necessary for the operation of the working machine. Thus, the device of the invention can be installed on work machines known per se, the functionality of the working machine does not depend on the device.
    Other features and advantages of the invention will be described with reference to Figure 1.
    Figure 1 shows the schematic hydraulic circuit of the invention described here.
    When operating a working machine comprising a device according to the invention, it is possible for the hydraulic accumulator 16 to be under a corresponding prestressing pressure If the storage action is to be started , an external force must act on the differential cylinder 1 or the corresponding piston to trigger a retraction.Therefore, pressures are generated on the piston head side 3 of the differential cylinder 1, which define the existing potential energy. must be taken by the accumulator 16. To start the lowering action, the hydraulic accumulator valve 17 is open and thus a connection between the hydraulic accumulator 16 and the piston rod side 2 of the differential cylinder 1 is The hydraulic accumulator valve 17 may be a two-way valve To initiate the retracting movement of the differential cylinder 1, the pressure relief valve This connecting valve 18 establishes a connection between the piston head 3 and the piston rod 2 side of the differential cylinder 1. By this connecting valve 18, the volume flow passes from the piston head side 3 to the piston rod side 2 of the differential cylinder. Due to the ratio of the surfaces between the piston head side 3 and the piston rod side 2, it is impossible for the piston rod side 2 to receive the entire volume. The differential volume that has passed through the hydraulic accumulator valve is received by the hydraulic accumulator 16. Based on the opening surface of the connecting valve 18 and the resulting throttling for the volume flow. oil from the piston head side 3 of the differential cylinder 1, the retraction speed of the differential cylinder 1 under load can be influenced. When the retraction movement of the differential cylinder 1 is to be stopped, the connecting valve 18 and the hydraulic accumulator valve 17 are closed. By closing the accumulator valve 17, the hydraulic accumulator 16 is closed and the hydraulic energy received remains stored in the accumulator 16.
    After the storage action, the energy of the volume of oil under pressure in the accumulator 16 can be fed back into the drive line of the machine, for which purpose the support motor 11 is connected to the accumulator 16 via the support motor valve 14. The support motor 11 can be installed directly on the dispensing gear 13 of the machine and can be driven with a number of revolutions defined by the drive motor 12. Depending on the volume of swallowing of the support motor 11, energy is then injected into the drive line of the machine according to the operating states of the accumulator At the end of the injection action , the support motor valve 14 is closed and thus the connection between the hydraulic accumulator 16 and the support motor 11 is interrupted.
    The hydraulic accumulator 16 may be designed for the entire lifting path of the differential cylinder 1 or only for a part thereof. When the hydraulic accumulator 16 is designed only for part of the lifting stroke of the differential cylinder 1 and when a retraction movement has to be made beyond the designed limit of the differential cylinder 16, the connecting valve 18 and the valve hydraulic accumulator 17 are closed and the brake valve 6 is controlled. Part of the volume flow passes from the piston head 3 side of the cylinder 1 through the braking valve 6, under a prestressing pressure predetermined by the prestressing valve 8, by the non-return valve 7 on the piston rod 2 side of the differential cylinder 1. By this, a lack of filling is prevented on the piston rod 2 side of the differential cylinder 1 during the retraction movement. The volume flow from the piston head 3 of the differential cylinder 1, not received by the piston rod 2 of the differential cylinder 1, passes through the prestressing valve 8 in the tank 9.
    When, in the working cycle of the machine, it follows an output movement or retraction of the differential cylinder 1 by a corresponding servocontrol of the working pump 10 and the control valve 15, the connecting valve 18 and the hydraulic storage valve 17 are kept closed. The arrival and the departure of the volume flows of the differential cylinder 1 then take place according to the state of connection of the control valve 15.
    The invention comprises at least one differential cylinder 1. Other differential cylinders can be integrated in the system at the connection 4 on the piston rod side and the connection 5 on the piston head side of the differential cylinder 1.
    Dansestiméot Aanne-decontrol15.
    As hydraulic accumulator 16, all types of hydraulic accumulator having different energy storage means, for example nitrogen, may be used. It is conceivable embodiments in the form of bladder accumulators, piston accumulators, diaphragm accumulators or spring accumulators as well as various combinations of accumulator embodiments.
    The valves shown can be used as individual two-way valves or as a combination on a valve stem. Here, a proportional control or a switching servo are also possible.
    The invention is distinguished by the fact that one or more differential cylinder piston devices 100 can be retracted under thrust load and the existing potential energy can be stored to a large extent by one or more Hydraulic accumulators 16. The differential cylinder piston devices 100 may in this case be referred to as linear drive means. The term cylinder or differential cylinder may relate indifferently, depending on the context and in a manner obvious to those skilled in the art, the differential cylinder piston device of the invention.
    The invention is further distinguished by the fact that one or more differential cylinders can be retracted under thrust load and the filling of the piston rod sides of the cylinders can be performed at a high pressure level. During the retraction movement, a connection between the piston head side and the piston rod side of the differential cylinder or differential cylinders is established. By this, the pressure of the piston head side exists on the piston rod side · Depending on the ratio of the surfaces, a pressure increase is generated which leads to an increase of the pressure on the piston head side. At the same time, one or more hydraulic accumulators are connected to the piston rod sides during the retraction action. By partially restricting the connection between the piston head side and the piston rod side of the differential cylinders, speed control can be exerted. The volume difference between the piston head chamber and the piston rod end chamber of the differential cylinders is received by the hydraulic accumulator (s). Due to the small pressure difference between the piston head side and the piston rod side of the differential cylinders, only a portion of the potential energy is converted into heat, and thus more energy is available than can be stored in the heat pump. the fact that the drive (hydraulic) can be pulled out or retracted without the hydraulic accumulator (s) and valves (2) being actuated to store the potential energy This is achieved inside the hydraulic circuit by a corresponding parallel connection hydraulic linear drive.
    The invention is further distinguished by the fact that it is possible to store energy on the entire path or only on a portion of the path of the possible path of the differential cylinder.
    The invention is distinguished by the fact that the stored energy of the lowering movement of the single differential cylinder or multiple differential cylinders can be reused. This can be achieved by the fact that a hydraulic motor is connected to the corresponding hydraulic accumulator and that the energy contained in the hydraulic accumulator is injected into the drive line of the machines to support the primary drive source as for example a diesel engine or an electric motor of the working machine.
    The invention is further distinguished by the fact that it can be integrated in the drive line of a machine without influencing the functions of the drive line in such a way that the complete operating capability depend on the invention. This means that the machine can also function without problems without the operating capability of the invention.
    权利要求:
    Claims (10)
    [1" id="c-fr-0001]
    1. Device for recovering hydraulic energy in a working machine, with at least a first differential cylinder piston device (100) with a differential cylinder (1) and piston rod sides (2) and piston head (3) separated, and with at least one hydraulic accumulator (16) which is adapted to be hydraulically connected to the differential cylinder piston device (100), the potential energy of the differential cylinder piston device (100) into retraction under a thrust load which can be stored at least partially in the hydraulic accumulator (16) and the piston rod sides (2) and piston head (3) being adapted to be connected to one another by a brake valve (6) for the return of hydraulic fluid from the piston head side (3) to the piston rod side (2).
    [2" id="c-fr-0002]
    2. Device according to claim 1, characterized in that the hydraulic accumulator (16) can be hydraulically connected to more than said piston actuator device
    [3" id="c-fr-0003]
    Device according to claim 1 or 2, characterized in that a support motor (11) is provided which is configured to inject the hydraulic energy stored in the hydraulic accumulator (16) into a drive train of the working machine and recover it thus, the support motor (11) being capable of being connected to the hydraulic accumulator (16) in particular via a support motor valve (14).
    [4" id="c-fr-0004]
    4. Device according to claim 2, characterized in that the differential cylinder piston devices (100) are arranged for operation in parallel with each other.
    [5" id="c-fr-0005]
    Device according to one of the preceding claims, characterized in that at least one working pump (10) is provided for driving the differential cylinder piston device (100) and / or in that it is provided at least one control valve (15) for controlling the differential cylinder piston device (100) and / or that at least one reservoir (9) is provided and / or that a valve is provided hydraulic accumulator (17) for closing the hydraulic accumulator (16) relative to the differential cylinder piston device (100),
    [6" id="c-fr-0006]
    Device according to claim 5, characterized in that a connecting valve (18) is provided for closing the piston head (3) with respect to the piston rod (2) side of the differential piston device. (100).
    [7" id="c-fr-0007]
    7. Device according to claim 6, characterized in that, by closing the piston head side (3) relative to the piston rod side (2), a pressure increase is performed.
    [8" id="c-fr-0008]
    8. Device according to one of the preceding claims, characterized in that the hydraulic accumulator (16) is connectable to the piston rod side (2) of the differential cylinder (1).
    [9" id="c-fr-0009]
    9. Working machine, in particular wheel loader, excavator or crane, with a device for recovering hydraulic power according to one of claims 1 to 8.
    [10" id="c-fr-0010]
    10. Working machine according to claim 9, characterized in that the working machine is configured to be able to operate unhindered on other functions when the device for direct recovery of hydraulic energetics is defective.
    类似技术:
    公开号 | 公开日 | 专利标题
    FR3052826A1|2017-12-22|
    EP2361798B1|2013-05-22|Hydraulic transmission system in which the main pump can be permanently activated
    RU2710124C2|2019-12-24|Vehicle hydraulic boost device and method of pressure release in such device
    EP3040226B1|2020-07-08|Hydraulic Hybrid Powertrain
    KR20140038437A|2014-03-28|Energy recovery method and system
    FR3035925A1|2016-11-11|DEVICE FOR OPTIMIZED HYDRAULIC CONTROL IN ENERGY OF A DOUBLE-EFFECTED CYLINDER
    US10815646B2|2020-10-27|Boom potential energy recovery of hydraulic excavator
    US20120055149A1|2012-03-08|Semi-closed hydraulic systems
    FR2842225A1|2004-01-16|Hydraulic circuit for boom cylinder combination has two inner paths formed on one side of cylinder to connect operation oil from hydraulic pump to hydraulic tank, and to connect oils from chambers to tank, respectively
    FR2564048A1|1985-11-15|HYDRAULIC BRAKING SYSTEM WITH SLIDING REGULATION
    JP2013511013A|2013-03-28|Hydraulic drive device with energy regeneration function
    FR2958886A1|2011-10-21|HYDRAULIC TRANSMISSION DEVICE FOR LITTLE CRABOTAGE
    FR3052825A1|2017-12-22|
    US20150368879A1|2015-12-24|Combined Hydraulic Implement and Propulsion Circuit with Hybrid Energy Capture and Reuse
    FR3052824A1|2017-12-22|DEVICE FOR DIRECTLY RECOVERING HYDRAULIC ENERGY USING A SINGLE EFFECT HYDRAULIC CYLINDER
    EP0942103B1|2003-10-01|Valve device for an hydraulic motor driving a large inertial mass
    FR2518186A1|1983-06-17|HYDRAULIC VALVE ARRANGEMENT FOR BACKHOE TILTING MECHANISM
    FR2659699A1|1991-09-20|HYDRAULIC CIRCUIT FOR WORK EQUIPMENT COMPRISING A PLURALITY OF HYDRAULIC MANEUVERING DEVICES CONTROLLED THROUGH A TRACTOR.
    CN100516558C|2009-07-22|Rotatary brake valve
    FR2873175A1|2006-01-20|HYDRAULIC CIRCUIT COMPRISING A MULTIFUNCTION SELECTOR
    EP2558742B1|2016-03-16|Hydraulically regulated electromagnetic actuator, and landing gear fitted with such an actuator for controlling same
    US20150020511A1|2015-01-22|Method for energy recovery of hydraulic motor
    CN205190376U|2016-04-27|Buoyancy adjusting device
    JP2001295813A|2001-10-26|Hydraulic circuit for work machine
    EP0494019B1|1995-10-18|Hydraulic, tappet actuated ejection device with automatic recharging system
    同族专利:
    公开号 | 公开日
    FR3052826B1|2020-07-10|
    AU2017204033A1|2018-01-18|
    DE102016007286A1|2017-12-21|
    US10890199B2|2021-01-12|
    AU2017204033B2|2019-04-04|
    US20170363122A1|2017-12-21|
    引用文献:
    公开号 | 申请日 | 公开日 | 申请人 | 专利标题
    US7634911B2|2007-06-29|2009-12-22|Caterpillar Inc.|Energy recovery system|
    US7827787B2|2007-12-27|2010-11-09|Deere & Company|Hydraulic system|
    US9279236B2|2012-06-04|2016-03-08|Caterpillar Inc.|Electro-hydraulic system for recovering and reusing potential energy|JP6752963B2|2017-03-29|2020-09-09|日立建機株式会社|Work machine|
    WO2021097699A1|2019-11-20|2021-05-27|徐州重型机械有限公司|Hydraulic system|
    CN111075793A|2019-12-16|2020-04-28|湖南联诚轨道装备有限公司|Hydraulic cylinder high-temperature reciprocating test device and method|
    法律状态:
    2018-06-22| PLFP| Fee payment|Year of fee payment: 2 |
    2019-06-25| PLFP| Fee payment|Year of fee payment: 3 |
    2020-06-20| PLFP| Fee payment|Year of fee payment: 4 |
    2021-06-30| PLFP| Fee payment|Year of fee payment: 5 |
    优先权:
    申请号 | 申请日 | 专利标题
    DE102016007286.5A|DE102016007286A1|2016-06-15|2016-06-15|Device for recuperation of hydraulic energy with energy-efficient refilling of the rod sides of differential cylinders and simultaneous pressure transmission|
    DE102016007286.5|2016-06-15|
    [返回顶部]