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1. 发明授权

US5505043A Hydraulic lift device for battery operated industrial trucks or the like 失效
标题翻译：用于电池操作的工业卡车等的液压提升装置
公开(公告)号：US5505043A
公开(公告)日：1996-04-09
申请号：US250514
申请日：1994-05-27
申请人： Ralf Baginski , Hans-Peter Claussen , Andreas Klatt , Hans-Joachim Doss , Jochen Korner
发明人： Ralf Baginski , Hans-Peter Claussen , Andreas Klatt , Hans-Joachim Doss , Jochen Korner
IPC分类号： B66F9/20 , D04B35/04 , F16D31/02 , F15B13/16
CPC分类号： B66F9/20
摘要： A hydraulic lift device for battery operated industrial trucks comprising a hydraulic ram, a hydraulic machine operating as a pump in a load raising cycle and as a motor in a load lowering cycle, a separately excited DC machine operating as a motor in the load raising cycle and as a generator in the load lowering cycle, and energy recovering circuitry which is fed by the DC machine in the load lowering cycle. A load holding valve is disposed in the fluid path between the hydraulic ram and the hydraulic machine. Speed of the DC machine is set by a speed control. A separate field current control includes a desired value setting circuit for determining a desired value for the field current (I.sub.FSoll) from a predetermined relationship between the speed (n.sub.Ist) and the armature current (I.sub.ASoll). Power switches are associated with the field winding and the armature, and are actuated by the current control. The power switches are arranged and controlled such than the intensity and the direction of the current through the armature and field winding are defined. The current control comprises a directional setting control for the lowering and raising cycle generating signals to control the load holding valve.
摘要翻译：一种用于电池操作的工业卡车的液压升降装置，包括液压油缸，在负载提升循环中作为泵运行的液压机和负载降低循环中的电动机，在负载升高循环中作为电动机工作的单独激励的DC电机并且作为负载降低周期中的发电机，以及在负载降低周期中由DC机馈送的能量恢复电路。负载保持阀设置在液压油缸和液压机之间的流体路径中。直流电机的速度由速度控制设定。单独的励磁电流控制包括用于根据速度（nIst）和电枢电流（IASoll）之间的预定关系确定励磁电流（IFSoll）的期望值的期望值设定电路。电源开关与励磁绕组和电枢相关联，并由电流控制启动。功率开关被布置和控制，例如限定通过电枢和励磁绕组的电流的强度和方向。电流控制包括用于降低和升高循环产生信号以控制负载保持阀的方向设定控制。

2. 发明授权

US5649422A Hydraulic lift apparatus for a battery driven lift truck 失效
标题翻译：液压升降机用于电池驱动的起重车
公开(公告)号：US5649422A
公开(公告)日：1997-07-22
申请号：US378793
申请日：1995-01-26
申请人： Ralf Baginski , Hans-Peter Claussen , Hans-Joachim Doss , Andreas Klatt
发明人： Ralf Baginski , Hans-Peter Claussen , Hans-Joachim Doss , Andreas Klatt
IPC分类号： B66F9/22 , B66F9/24 , F15B21/14 , F16D31/02
CPC分类号： B66F9/24 , B60L1/003 , B60L1/20 , B60L11/1805 , B66F9/22 , F15B21/14 , B60L2200/42 , Y02T10/7005
摘要： A hydraulic lift apparatus for a battery driven lift truck includes a hydraulic lift cylinder. A hydraulic pump operates as a pump in a load raising mode, so as to feed pressure fluid to the lift cylinder. The hydraulic pump operates as a motor in a load lowering mode. The hydraulic pump is driven by the pressure fluid displaced by the lift cylinder. A direct current machine is coupled to the hydraulic pump, so as to operate as an electric motor in the load raising mode and to operate as a generator in the load lowering mode. A useful brake circuit is energized by the direct current machine in the load lowering mode. A valve assembly is disposed in the pressure fluid path between the lift cylinder and the hydraulic pump. Control apparatus are provided for controlling the valve assembly and including speed regulating apparatus for varying the speed of the direct current machine. At least one secondary hydraulic consumer is adapted to be connected to a hydraulic pressure source via an associated control valve. A lowering branch is provided between the valve assembly and a connection is provided between a check valve and the inlet of the hydraulic pump. The secondary hydraulic consumer receives fluid from the hydraulic pump via the valve assembly. There is provided an externally excited direct current machine having its speed controlled by the speed regulating apparatus in response to operation of the valve assembly.
摘要翻译：一种用于电池驱动的起重车的液压提升装置包括液压提升缸。液压泵作为负载提升模式中的泵运行，以将压力流体供给到提升缸。液压泵作为负载降低模式下的电动机工作。液压泵由被提升缸移动的压力流体驱动。直流电机耦合到液压泵，以便在负载提升模式下作为电动机工作，并且在负载降低模式下作为发电机工作。在负载降低模式下，有用的制动电路由直流电机通电。阀组件设置在提升缸和液压泵之间的压力流体路径中。提供控制装置用于控制阀组件，并且包括用于改变直流电机速度的调速装置。至少一个次级液压消耗器适于通过相关联的控制阀连接到液压源。在阀组件之间设置有下降分支，并且在止回阀和液压泵的入口之间提供连接。次级液压消耗器经由阀组件从液压泵接收流体。提供了外部激励的直流电机，其响应于阀组件的操作而由速度调节装置控制其速度。

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