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    • 1. 发明授权
    • Hydrostatic pump and disable control therefor
    • 液压泵和禁用控制
    • US6158969A
    • 2000-12-12
    • US397696
    • 1999-09-16
    • Kevin J. GrafJerry D. Schrag
    • Kevin J. GrafJerry D. Schrag
    • F04B1/32F04B1/26
    • F04B1/324F04B2207/00Y10T137/2322
    • 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.
    • 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。
    • 2. 发明授权
    • Lower and float capability in four position control valve
    • 四位控制阀的下浮动能力
    • US5992454A
    • 1999-11-30
    • US120352
    • 1998-07-21
    • Jerry D. Schrag
    • Jerry D. Schrag
    • F15B13/04
    • F15B13/0402F15B2013/0413Y10T137/87241
    • A spool valve assembly (11) including a valve spool (33) defining a Raise position (R) operable to provide fluid communication from an inlet port (21) to a work port (25), and a Neutral position (N) blocking such flow. The spool valve (33) has a Lower position (L) in which return flow from the work port (25) flows past a pilot operated check valve (77) is then metered by a metering notch (75) defined by the valve spool. The valve spool (33) also has a separate Float position (F) in which the inlet port (21), the work port (25) and the return port (23) are interconnected. In the Float position (F), fluid at the valve spool (33) is in communication with the return port (23) through a back-pressure valve (59), which may be manually adjusted to control the back-pressure on a work implement (15) as it is permitted to "float".
    • 一个滑阀组件(11),其包括限定可操作以提供从入口(21)到工作端口(25)的流体连通的提升位置(R)的阀芯(33),以及阻塞这样的中性位置 流。 滑阀(33)具有下位置(L),其中来自工作端口(25)的返回流量经过先导操作止回阀(77)流动,然后通过由阀芯限定的计量凹口(75)进行计量。 阀芯(33)还具有单独的浮动位置(F),其中入口端口(21),工作端口(25)和返回端口(23)互连。 在浮动位置(F)中,阀芯(33)处的流体通过背压阀(59)与回流口(23)连通,背压阀(59)可以手动调节以控制工件的背压 执行(15)允许“浮动”。