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    • 51. 发明公开
    • PILOT PRESSURE CONTROL SYSTEM
    • PILOTDRUCKREGELUNGSSYSTEM
    • EP2964963A1
    • 2016-01-13
    • EP13877325.4
    • 2013-03-06
    • Volvo Construction Equipment AB
    • VIGHOLM, Bo
    • F15B20/00E02F9/22F15B11/16
    • A pilot pressure control system for controlling a pilot signal pressure at a pilot inlet of a control valve includes a pilot outlet adapted to be connected to the pilot inlet. The pilot pressure control assembly further includes a first pilot valve assembly and a second pilot valve assembly. Each one of the first and second pilot valve assemblies are individually controllable so as to selectively provide a first fluid flow direction from a pressure line to the pilot outlet and a second fluid flow direction from the pilot outlet to a drain line. At least the first pilot valve assembly is adapted to assume a maximum pressure supply condition so as to supply a first pilot valve assembly maximum pressure to the pilot outlet. At least the second pilot valve assembly is adapted to provide a pressure drop from the pilot outlet to the drain line via the second pilot valve assembly. The pilot pressure control system is configured such that, when the pilot pressure control system is connected to the pressure and drain lines and when the first pilot valve assembly is controlled so as to assume the maximum pressure supply condition and the second pilot valve assembly provides a fluid flow in the second fluid direction with a minimum pressure drop, the pressure at the pilot outlet is equal to or above 20 of the first pilot valve assembly maximum pressure (Pmax).
    • 用于控制控制阀的先导入口处的先导信号压力的先导压力控制系统包括适于连接到先导入口的先导出口。 先导压力控制组件还包括第一先导阀组件和第二先导阀组件。 第一和第二先导阀组件中的每一个都是可独立控制的,以便选择性地提供从压力管线到先导出口的第一流体流动方向和从引导出口到排出管线的第二流体流动方向。 至少第一先导阀组件适于承受最大压力供应状态,以便将第一先导阀组件的最大压力提供给先导出口。 至少第二先导阀组件适于经由第二先导阀组件从先导出口到排出管线提供压降。 先导压力控制系统构造成使得当先导压力控制系统连接到压力和排出管线并且控制第一先导阀组件以便承受最大压力供应状态并且第二先导阀组件提供 在第二流体方向上的流体流以最小压力降,先导出口处的压力等于或大于第一先导阀组件最大压力(Pmax)的20°。
    • 56. 发明公开
    • CONTROL VALVE ASSEMBLY
    • 控制阀总成
    • EP2855944A1
    • 2015-04-08
    • EP12818696.2
    • 2012-12-13
    • Clark Equipment Company
    • COOMBS, Jason, R.AUBIN, Joseph, A. St.LACHER, Jonathan, J.KOCH, Rodney
    • F15B11/16
    • A power machine and a power conversion system for a power machine are disclosed. In an exemplary embodiment, the power conversion system includes a pump configured to provide a source of pressurized hydraulic fluid and a control valve assembly to receive the hydraulic fluid. The control valve assembly includes a first valve element configured to direct hydraulic fluid to an actuator when the first valve element is in first and second actuated positions. The control valve assembly also includes a second valve element downstream of the first spool. The first valve element is moveable between an unactuated position and the first and second actuated positions and is configured to direct hydraulic fluid received from the actuator through the second actuated position to the second valve element and to direct hydraulic fluid received from the actuator through the first actuated position to bypass the second valve element.
    • 公开了用于动力机械的动力机械(100)和动力转换系统(106)。 在示例性实施例中,功率转换系统包括构造成提供加压液压流体源的泵(206)和接收液压流体的控制阀组件(204,300)。 控制阀组件包括第一阀元件(308),该第一阀元件构造成当第一阀元件处于第一致动位置(342)和第二致动位置(346)时将液压流体引导至致动器(314)。 控制阀组件还包括在第一阀元件下游的第二阀元件(310)。 第一阀元件可在未致动位置(344)与第一致动位置和第二致动位置之间移动,并且构造成将从致动器接收的液压流体通过第二致动位置引导至第二阀元件并引导从致动器接收的液压流体 通过第一致动位置绕过第二阀元件。
    • 59. 发明公开
    • ELECTRO-HYDRAULIC SYSTEM FOR CONTROLLING MULTIPLE FUNCTIONS
    • ELEKTROHYDRAULISCHES系统ZUR STEUERUNG MEHRERER FUNKTIONEN
    • EP2686561A1
    • 2014-01-22
    • EP12709458.9
    • 2012-03-05
    • Parker-Hannifin Corporation
    • FRANZONI, GermanoHARSIA, JarmoLOWMAN, Roger
    • F15B11/16
    • F15B11/162F15B11/165F15B13/022F15B2211/20546F15B2211/253F15B2211/50536F15B2211/57F15B2211/6055F15B2211/6346F15B2211/6652F15B2211/85
    • Electro-hydraulic systems (10, 110, 210, 310, 410, 510, 610 and 710) control multiple hydraulic motors without objectionable erratic or jerky motion. The system (10) includes a variable displacement pump (20), an electronic controller (30), a direction control valve (40), first and second pump outlet valves (60) and (70), and a fluid reservoir (80). The pump (20) does not require or use a load feedback signal to control pump output. The controller (30) provides electric control signals to a pump control (21) and to individual hydraulic motors (51). A load sense circuit (46) resolves a highest load sense pressure Ps, which is communicated to the first and second pump outlet valves (60) and (70). The first pump outlet valve (60) limits the maximum load sense pressure. The second pump outlet valve (70) limits the maximum pressure differential between the pump outlet and the load sense pressure.
    • 电动液压系统(10,110,210,310,410,510,610和710)控制多个液压马达,而不会产生不良反应或不稳定的运动。 系统(10)包括可变排量泵(20),电子控制器(30),方向控制阀(40),第一和第二泵出口阀(60)和(70)以及流体储存器(80) 。 泵(20)不需要或使用负载反馈信号来控制泵输出。 控制器(30)向泵控制器(21)和单独的液压马达(51)提供电控制信号。 负载检测电路(46)解决了传递到第一和第二泵出口阀(60)和(70)的最高负载检测压力Ps。 第一泵出口阀(60)限制最大负载感测压力。 第二泵出口阀(70)限制泵出口和负载感测压力之间的最大压差。