公开(公告)号：US5017094A

公开(公告)日：1991-05-21

申请号：US491776

申请日：1990-03-12

申请人： Kevin J. Graf ,  James J. Hastreiter ,  Duane A. Anderson

发明人： Kevin J. Graf ,  James J. Hastreiter ,  Duane A. Anderson

IPC分类号： F04B49/06 ,  F04B49/10

CPC分类号： F04B49/06 ,  F04B49/10

摘要： A control system (33, 41) is disclosed of the type used to control the displacement of a variable displacement pump (11) having stroking cylinders (25, 27). The control system includes a pair of ON-OFF electromagnetic valves (49, 51) and a proportional valve (85). When a first direction of operation is selected, a first direction command signal (43) is transmitted to the first ON-OFF valve (40) such that control pressure from the charge pump (17) flows through the valve (49), then through the proportional valve (85) and through the valve (51) to the reservoir (75) until the proportional valve (85), in response to an increasing displacement signal (47), moves from its minimum displacement position (FIG. 1) toward a position corresponding to the desired displacement of the pump. With the control system of the present invention, two of the three electromagnetic valves (49, 51, 85) would have to fail, such as being stuck in an open position, in order for the vehicle operator to be unable to bring the vehicle to a safe stop.

摘要翻译： 公开了一种用于控制具有抚摸缸（25,27）的可变排量泵（11）的排量的类型的控制系统（33,41）。 控制系统包括一对ON-OFF电磁​​阀（49,51）和比例阀（85）。 当选择第一操作方向时，第一方向指令信号（43）被传送到第一通断阀（40），使得来自电荷泵（17）的控制压力流过阀（49），然后通过 响应于增加的位移信号（47），比例阀（85）和通过阀（51）到储存器（75）直到比例阀（85）从其最小位移位置（图1）向着 对应于泵的期望位移的位置。 利用本发明的控制系统，三个电磁阀（49,51,85）中的两个将不得不失效，例如卡在打开位置，以便车辆操作者不能将车辆带到 一个安全的停止。

公开(公告)号：US4951462A

公开(公告)日：1990-08-28

申请号：US361516

申请日：1989-06-05

申请人： Kevin J. Graf

发明人： Kevin J. Graf

IPC分类号： F16H61/42 ,  F16H61/423

CPC分类号： F16H61/423 ,  F16H61/42 ,  F16H2059/6853

摘要： A closed-loop hydrostatic transmission is disclosed of the type with a fluid pump (10) and a fluid motor (12), both of which are variable displacement. A pair of stroking cylinders (36,38) varies the displacement of the motor between minimum displacement and maximum displacement, under the control of a motor stroking valve (70) which includes a stroking valve member (90) movable in response to changes in fluid pressure in a pressure chamber (110). The displacement of the pump is controlled by a main controller (50) in response to movement of an input handle (60). Whenever the handle (60) is moved to the neutral position, a neutral switch (122) is closed, thus generating a neutral signal which is transmitted to an electromagnetic valve member (114), which controls the pressure in the fluid pressure chamber (110) to command the motor to maximum displacement. With the motor at maximum displacement, subsequent movement of the handle (60) away from the neutral position, to begin to propel the vehicle, results in a smoother start-up of the vehicle because the motor is at maximum displacement (a high-torque, low-speed condition). Starting the vehicle with the motor at maximum displacement also reduces the amount of rise of system pressure above the relief valve setting, thus reducing the amount of heat generated and the amount of horsepower wasted.

摘要翻译： 公开了具有流体泵（10）和流体马达（12）的类型的闭环静液压传动装置，它们都是可变排量的。 一对抚摸气缸（36,38）在马达打动阀（70）的控制下改变电动机在最小排量和最大排量之间的位移，其中包括响应于流体变化而移动的冲击阀构件（90） 压力室（110）中的压力。 响应于输入手柄（60）的移动，泵的位移由主控制器（50）控制。 每当手柄（60）移动到中立位置时，中性开关（122）关闭，从而产生中性信号，该中性信号被传递到电磁阀构件（114），该电磁阀构件控制流体压力室（110）中的压力 ）命令电机达到最大排量。 随着电动机处于最大位移，手柄（60）远离中立位置的后续运动开始推动车辆，导致车辆更平稳的启动，因为电动机处于最大位移（高扭矩 ，低速条件）。 用最大排量的电机起动车辆也减少了系统压力上升到安全阀设定值以上，从而减少了产生的热量和浪费的马力。

公开(公告)号：US6158969A

公开(公告)日：2000-12-12

申请号：US397696

申请日：1999-09-16

申请人： Kevin J. Graf ,  Jerry D. Schrag

发明人： Kevin J. Graf ,  Jerry D. Schrag

IPC分类号： F04B1/32 ,  F04B1/26

CPC分类号： F04B1/324 ,  F04B2207/00 ,  Y10T137/2322

摘要： A variable displacement hydrostatic pump (11) having its displacement varied by a controller (17) in response to movement of a manual control lever (95) from a neutral position (FIG. 1). The vehicle has at least one other device (125,127) which provides an electrical output signal (133) indicating when operation of the pump (11) is "acceptable", in terms of either vehicle performance or operator safety. Associated with the control lever (95) is an input shaft (103) defining at least one stop surface (121,123). A solenoid assembly (109) has a moveable plunger (111), disposed adjacent the stop surfaces, and moveable between a retracted position (FIG. 4a) and an extended position (FIGS. 2 and 4), engaging one of the stop surfaces, when the output signal (133) indicates that operation of the pump is not acceptable.

摘要翻译： 响应于来自中立位置（图1）的手动控制杆（95）的移动，其位移由控制器（17）变化的可变排量静液压泵（11）。 车辆具有至少一个其他设备（125,127），其提供电输出信号（133），其指示在车辆性能或操作员安全性方面，泵（11）的操作是“可接受的”。 与控制杆（95）相关联的是限定至少一个止挡表面（121,123）的输入轴（103）。 螺线管组件（109）具有可移动的柱塞（111），其邻近所述止动表面设置并且可在缩回位置（图4a）和延伸位置（图2和图4）之间移动，接合止动表面之一， 当输出信号（133）指示泵的操作不可接受时。

公开(公告)号：US06739127B2

公开(公告)日：2004-05-25

申请号：US10164015

申请日：2002-06-07

申请人： Andrew H. Nippert ,  Kevin J. Graf

发明人： Andrew H. Nippert ,  Kevin J. Graf

IPC分类号： F16D3102

CPC分类号： F15B1/033

摘要： An apparatus for charging a hydraulic system from a fluid reservoir includes a pump having an inlet and an outlet, a first conduit fluidly connected to the pump inlet and fluidly connectable to the fluid reservoir, and a second conduit fluidly connected to the pump outlet and fluidly connectable to the system. The apparatus also includes an accumulator operatively connected to the second conduit, a third conduit interconnecting the first conduit and the second conduit, and an electrically actuated fill valve operatively disposed in the third conduit.

摘要翻译： 一种用于从流体储存器充电液压系统的装置包括具有入口和出口的泵，流体连接到泵入口并且可流体连接到流体储存器的第一管道，以及流体地连接到泵出口并且流体连接的第二管道 可连接到系统。 该装置还包括可操作地连接到第二导管的蓄能器，将第一导管和第二导管相互连接的第三导管以及可操作地设置在第三导管中的电致动的填充阀。