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公开(公告)号：US07231940B2
公开(公告)日：2007-06-19
申请号：US11532122
申请日：2006-09-15
IPC分类号： B52D5/083
CPC分类号： B62D5/0837 , Y10T137/86638 , Y10T137/86654 , Y10T137/86662
摘要： A control valve for a hydraulic power steering system includes a pair of flow circuits arranged in parallel. Each flow circuit includes an upstream and downstream flow orifices arranged in series. Each set of orifices defines between the orifices an intermediate pressure zone of the valve. Both orifices close together from a centered condition of the valve and fully close substantially together at a fully closed condition of the valve. The downstream orifice is larger than the upstream orifice when open to minimize the likelihood of cavitation and noise. An equalization passage fluidly connects both intermediate pressure zones to equalize pressure despite variations in orifice size due to manufacturing tolerances. The control valve includes a bypass passage in parallel with the flow circuits. A pressure relief valve in the control valve has a normally closed valving member in the bypass passage that opens the valve in the event of overpressure.
摘要翻译： 一种用于液压动力转向系统的控制阀，包括一对平行布置的流动回路。 每个流动回路包括串联布置的上游和下游流动孔。 每组孔口在孔之间形成阀的中间压力区。 两个孔从阀的中心状态靠近在一起，并且在阀的完全关闭状态下基本上完全关闭。 下游孔口开放时大于上游孔口，以最小化气蚀和噪音的可能性。 平衡通道流体连接两个中间压力区域，以均衡压力，尽管由于制造公差而孔尺寸的变化。 控制阀包括与流动回路平行的旁通通道。 控制阀中的压力释放阀具有旁通通道中的常闭阀构件，其在超压的情况下打开阀。
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公开(公告)号：US07152627B2
公开(公告)日：2006-12-26
申请号：US10818005
申请日：2004-04-05
IPC分类号： B52D5/083
CPC分类号： B62D5/0837 , Y10T137/86638 , Y10T137/86654 , Y10T137/86662
摘要： A control valve for a hydraulic power steering system includes a pair of flow circuits arranged in parallel. Each flow circuit includes an upstream and downstream flow orifices arranged in series. Each set of orifices defines between the orifices an intermediate pressure zone of the valve. Both orifices close together from a centered condition of the valve and fully close substantially together at a fully closed condition of the valve. The downstream orifice is larger than the upstream orifice when open to minimize the likelihood of cavitation and noise. An equalization passage fluidly connects both intermediate pressure zones to equalize pressure despite variations in orifice size due to manufacturing tolerances. The control valve includes a bypass passage in parallel with the flow circuits. A pressure relief valve in the control valve has a normally closed valving member in the bypass passage that opens the valve in the event of overpressure.
摘要翻译： 一种用于液压动力转向系统的控制阀，包括一对平行布置的流动回路。 每个流动回路包括串联布置的上游和下游流动孔。 每组孔口在孔之间形成阀的中间压力区。 两个孔从阀的中心状态靠近在一起，并且在阀的完全关闭状态下基本上完全关闭。 下游孔口开放时大于上游孔口，以最小化气蚀和噪音的可能性。 平衡通道流体连接两个中间压力区域，以均衡压力，尽管由于制造公差而孔尺寸的变化。 控制阀包括与流动回路平行的旁通通道。 控制阀中的压力释放阀具有旁通通道中的常闭阀构件，其在超压的情况下打开阀。
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