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1. 发明授权

US5680988A Axial force indentation or protrusion for a reciprocating piston/barrel assembly 失效
标题翻译：用于往复式活塞/筒组件的轴向力凹陷或突起
公开(公告)号：US5680988A
公开(公告)日：1997-10-28
申请号：US376338
申请日：1995-01-20
申请人： Rajendra K. Patil , Ronald D. Shinogle
发明人： Rajendra K. Patil , Ronald D. Shinogle
IPC分类号： F02M47/02 , F02M57/02 , F02M59/36 , F02M59/46 , F02M45/00
CPC分类号： F02M63/0035 , F02M47/027 , F02M57/02 , F02M59/368 , F02M59/466 , F02M63/0017 , F02M63/0049 , F02M63/0061 , F02M63/007 , Y10T137/86686
摘要： A reciprocating piston/barrel assembly, through which a fluid is capable of flowing, includes a piston having a pressure face separated from a downstream face by a side surface. A barrel has an interior wall surface defining a bore that is sized to slidably receive the piston. The bore is longer than the piston such that the bore includes an upstream volume adjacent the pressure face of the piston and a downstream volume adjacent the downstream face of the piston. The assembly includes some way for producing a pressure differential between the upstream volume and the downstream volume. The side surface and/or interior wall surface include at least one surface irregularity--indentation and/or protrusion--of sufficient size to increase flow resistance. In order to produce the axial force effect of the present invention, the fluid flow between the piston side surface and the barrel's interior wall surface must be faster than the speed of the piston. The axial force phenomenon of the present invention primarily manifests as an increased pressure differential across the piston. When a portion of the surface irregularities appear on the piston, the axial force of the present invention is further increased because a portion of the fluid flow momentum is imparted to the piston. The present invention finds particular applicability in poppet valves where it is desirable to hasten the activation rate of the valve.
摘要翻译：流体能够流动的往复活塞/桶组件包括具有通过侧表面与下游面分离的压力面的活塞。桶具有限定孔径的内壁表面，其尺寸可滑动地容纳活塞。孔比活塞长，使得孔包括邻近活塞的压力面的上游体积和邻近活塞的下游面的下游体积。组件包括用于在上游体积和下游体积之间产生压差的一些方法。侧表面和/或内壁表面包括足够尺寸的至少一个表面不规则凹陷和/或突起以增加流动阻力。为了产生本发明的轴向力效应，活塞侧表面和桶的内壁表面之间的流体流必须比活塞的速度更快。本发明的轴向力现象主要表现为跨越活塞的增加的压力差。当一部分表面凹凸出现在活塞上时，本发明的轴向力进一步增加，因为流体动量的一部分被赋予活塞。本发明特别适用于提升阀，其中期望加速阀的活化速率。

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