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    • 5. 发明申请
    • PRESSURE LIMITING IN HYDRAULIC SYSTEMS
    • 液压系统压力限制
    • WO2012154464A2
    • 2012-11-15
    • PCT/US2012036090
    • 2012-05-02
    • CATERPILLAR INCHARLOW RANDALL AHAND TIMOTHY LBRINKMAN JASON LBACON KEVIN A
    • HARLOW RANDALL AHAND TIMOTHY LBRINKMAN JASON LBACON KEVIN A
    • F15B13/044F15B13/02
    • F15B11/168F15B2211/30555F15B2211/6058F15B2211/653F15B2211/654
    • This disclosure provides for pressure limiting a hydraulic system (100, 200) to a desired pressure value by a particular circuit by controlling and closing the compensator when the desired pressure setting is achieved. Closing the compensator will reduced the pressure head and flow in the circuit resulting in improved efficiency. One illustrated embodiment of the disclosure provides a relief valve (30) in the pilot signal for a compensator. The method relates to limiting the pressure on an open side (202a) of the compensator, such that the pressure on the other side closes the compensator thereby limiting the pressure and also flow in the hydraulic circuit. In other words, the pressure on the open side (202a) is limited by the relief valve (30). Thus, the pressure on the other side increases thereby regulating the flow and pressure through the compensator. In another embodiment of the disclosure, instead of reducing the pressure on the open side (202a), the pressure on the closed side (202b) is increased, thereby controlling the flow and pressure of the hydraulic circuit. The pressure can be increased by a pump (12) or any other suitable mode.
    • 本公开提供了当实现期望的压力设定时,通过控制和关闭补偿器,通过特定的电路将液压系统(100,200)限制到期望的压力值。 关闭补偿器将减少电路中的压头和流量,从而提高效率。 本公开的一个示出的实施例提供了用于补偿器的导频信号中的安全阀(30)。 该方法涉及限制补偿器的开放侧(202a)上的压力,使得另一侧的压力关闭补偿器,从而限制压力并且还在液压回路中流动。 换句话说,开放侧(202a)的压力受到安全阀(30)的限制。 因此,另一侧的压力增加,从而调节通过补偿器的流量和压力。 在本公开的另一个实施例中,代替减小开口侧(202a)上的压力,封闭侧(202b)上的压力增加,从而控制液压回路的流量和压力。 压力可以通过泵(12)或任何其他合适的模式来增加。
    • 6. 发明申请
    • PRESSURE COMPENSATED HYDRAULIC SYSTEM HAVING DIFFERENTIAL PRESSURE CONTROL
    • 具有差压控制的压力补偿液压系统
    • WO2011143301A1
    • 2011-11-17
    • PCT/US2011/036047
    • 2011-05-11
    • PARKER-HANNIFIN CORPORATIONCOOLIDGE, Gregory T.
    • COOLIDGE, Gregory T.
    • F15B11/16F15B11/05
    • F15B21/06F15B11/163F15B11/165F15B2211/20553F15B2211/30555F15B2211/653Y10T137/85986
    • A hydraulic control valve assembly (10), method and system, characterized by control valves (26) each having a variable metering orifice; a compensator (28) that controls flow of fluid from the variable metering orifice to a work port (A,B) in response to a differential in pressures acting on opposite first and second sides of the compensator, wherein a first side receives a pressure at the downstream side of the variable metering orifice; a load sense passage (34) providing a load sense pressure; and a differential pressure controller (40) having a first inlet connected to a pump supply port and a second inlet connected to the load sense passage, the controller having a first operational mode in which load sense pressure at the second inlet is supplied to an outlet of the controller and a second operational mode in which flow from the first inlet is metered to the outlet of the controller to provide a differential control output pressure, and wherein an outlet of the differential pressure controller is connected to a pump control port and/or to the second side of the pressure compensating valve of at least one of the control valves..
    • 一种液压控制阀组件(10),方法和系统,其特征在于每个具有可变计量孔的控制阀(26) 补偿器(28),其响应于作用在所述补偿器的相对的第一和第二侧上的压力差而控制流体从所述可变计量孔口到工作端口(A,B)的流动,其中第一侧接收压力 可变计量孔的下游侧; 提供负载感测压力的负载感测通道(34) 和压差控制器(40),其具有连接到泵供应端口的第一入口和连接到负载感测通道的第二入口,所述控制器具有第一操作模式,其中第二入口处的负载感测压力被供应到出口 以及第二操作模式,其中来自第一入口的流量计量到控制器的出口以提供差压控制输出压力,并且其中差压控制器的出口连接到泵控制端口和/或 到达至少一个控制阀的压力补偿阀的第二侧。
    • 9. 发明申请
    • CONTROLLED PROPORTIONAL VALVE
    • 控制比例阀
    • WO1994013524A1
    • 1994-06-23
    • PCT/DK1993000388
    • 1993-11-30
    • DANFOSS A/SFRIEDRICHSEN, Welm
    • DANFOSS A/S
    • B62D11/04
    • F15B13/0416F15B11/05F15B21/08F15B2211/20553F15B2211/30535F15B2211/329F15B2211/6051F15B2211/6054F15B2211/6313F15B2211/652F15B2211/653F15B2211/654F15B2211/665F15B2211/6653F15B2211/67
    • A controlled proportional valve is provided, with a main slide valve section (4) containing a main slide valve, which section controls a flow of fluid between a pump connection (P) connected to a pump (2) and a tank connection (T) connected to a tank (6) and two work connections connected to a load (5) and which generates a load-sensing signal (LSINT) in dependence on the pressures at the work connections (A, B), and with a compensating slide valve section (3) which controls the pressure across the main slide valve section (4) in dependence on the load-sensing signal (LSINT). It is desirable to achieve a more rapid response time in a proportional valve of that kind, wherein the control means should be capable of being retroffited in existing proportional valves. To that end, a control arrangement (10) which controls the pressure of the load-sensing signal (LSINT) to influence the actual volume flow and/or the actual pressure in the work connections (A, B) is provided.
    • 提供了一种控制比例阀,其中主滑阀部分(4)包含主滑阀,该部分控制连接到泵(2)的泵连接(P)和罐连接(T)之间的流体流动, 连接到罐(6)和连接到负载(5)的两个工作连接,并且根据工作连接(A,B)上的压力产生负载感测信号(LSINT),并且利用补偿滑阀 (3),其根据负载感测信号(LSINT)控制主滑阀部分(4)上的压力。 期望在这种比例阀中实现更快的响应时间,其中控制装置应该能够在现有的比例阀中被推回。 为此,提供了控制负载感测信号(LSINT)的压力以影响工作连接(A,B)中的实际体积流量和/或实际压力的控制装置(10)。
    • 10. 发明申请
    • LOAD SENSING HYDRAULIC SYSTEM FOR A WORKING MACHINE
    • 工作机械负载感应液压系统
    • WO2016204663A1
    • 2016-12-22
    • PCT/SE2015/050710
    • 2015-06-16
    • VOLVO CONSTRUCTION EQUIPMENT AB
    • VIGHOLM, Bo
    • F15B11/05E02F9/22F15B11/16
    • E02F9/2203E02F9/2232E02F9/2292E02F9/2296F15B11/165F15B2211/20546F15B2211/253F15B2211/6057F15B2211/653F15B2211/654F15B2211/71
    • The invention relates to a hydraulic system (20) for a working machine (1). The hydraulic system is a load sensing (LS) system and comprises a first hydraulic actuator (24) and a first control valve (25) for controlling the flow of hydraulic fluid from a pump (21) to the first hydraulic actuator and for draining hydraulic fluid from the first hydraulic actuator, respectively, and a second hydraulic actuator (26) and a second control valve (27) for controlling the flow of hydraulic fluid from the pump to the second hydraulic actuator and for draining hydraulic fluid from the second hydraulic actuator, respectively. The hydraulic system further comprises a first hydraulic circuit (28) for providing an LS pressure for the first actuator (24) and a second hydraulic circuit (29) for providing an LS pressure for the second actuator (26). At least one of the first and second hydraulic circuits (28, 29) comprises an offset valve (30a, 30b) for changing the LS pressure before providing the LS pressure to the pump (21).
    • 本发明涉及一种用于工作机械(1)的液压系统(20)。 液压系统是负载感测(LS)系统,并且包括第一液压致动器(24)和第一控制阀(25),用于控制从泵(21)到第一液压致动器的液压流体的流动并且用于排出液压 分别来自第一液压致动器的液体和第二液压致动器(26)和第二控制阀(27),用于控制液压流体从泵到第二液压致动器的流动并且用于从第二液压致动器排出液压流体 , 分别。 液压系统还包括用于为第一致动器(24)提供LS压力的第一液压回路(28)和用于为第二致动器(26)提供LS压力的第二液压回路(29)。 第一和第二液压回路(28,29)中的至少一个包括用于在向泵(21)提供LS压力之前改变LS压力的偏置阀(30a,30b)。