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1. 发明授权

US4000959A Free-piston rotary device particularly useful as hydraulic motor or pump 失效
标题翻译：自由活塞旋转装置特别适用于液压马达或泵
公开(公告)号：US4000959A
公开(公告)日：1977-01-04
申请号：US559239
申请日：1975-03-17
申请人： Iza Portugali
发明人： Iza Portugali
IPC分类号： F01C1/073 , F01C1/00 , F03C3/00 , F04C1/00
CPC分类号： F01C1/073
摘要： A free-piston bi-directional rotary device is described particularly useful as a compact, low-RPM, high-torque hydraulic motor, but which may also be useful for other applications such as rotary pumps, rotary engines, and the like. The rotary device comprises a stator, a rotor mounted coaxially for rotary movement with respect to the stator and spaced radially therefrom to define an annular gap therebetween, and a plurality of pistons movable within the annular gap in a circumferential direction. Each of the pistons is formed with a slot, and a coupling bar is disposed within the slot and is shiftable radially from a first position coupling the piston to the stator, to a second position coupling the piston to the rotor. The positioning means includes a hydraulic distributor which controls the flow of a pressurized fluid to the coupling bars in timed relationship to the rotation of the rotor, such that the bars are alternately coupled to the stator and to the rotor, to form alternating expansible and contractable chambers between successive pistons as the rotor rotates with respect to the stator.BACKGROUND OF THE INVENTIONThe present invention relates to rotary devices of the free-piston type. The invention is particularly useful with respect to low-RPM, high-torque bi-directional hydraulic motors, and is therefore described with respect to that application, but it will be appreciated that features of the invention could be used in other applications as well, such as hydraulic pumps, rotary engines, and the like.BRIEF SUMMARY OF THE INVENTIONAccording to the invention, there is provided a rotary device comprising a stator, a rotor mounted coaxially for rotary movement with respect to the stator and spaced radially therefrom to define an annular gap therebetween, and a plurality of pistons movable in a circumferential direction within the annular gap. Each of the pistons includes a coupling member movable from a first position coupling the piston to the stator, to a second position coupling the piston to the rotor. Positioning means are provided for selectively shifting the coupling members such that they are alternately coupled to the stator and to the rotor, to form alternating expansible and contractable chambers between successive pistons as the rotor rotates with respect to the stator.In the preferred embodiment of the invention described below, the coupling members are in the form of bars and each is shiftable in a slot extending in a radial direction through its respective piston. Also in the preferred embodiment, the positioning means for selectively shifting the coupling bars comprises a source of pressurized fluid and a hydraulic distributor controlling the flow of the fluid to the coupling bars in synchronized timed relationship to the rotation of the rotor.As indicated earlier, the preferred embodiment of the invention is a bi-directional hydraulic motor. In this embodiment, the rotary device includes a source of driving fluid, means for introducing the driving fluid into the chambers to cause them to expand and thereby to rotate the rotor, and means for removing the driving fluid from the chambers during the contraction thereof.Another described application of the invention is a pump, in which the rotary device includes a drive for driving the rotor, means for introducing fluid to be pressurized into the chambers as they expand by the rotation of the rotor, and means for removing the resulting pressurized fluid from the chambers as they are contracted by the rotation of the rotor.The invention, and particularly the arrangement for providing the alternating expansible and contractable chambers, could be used in other applications, e.g., in rotary combustion engines.Further features and applications of the invention will be apparent from the description below.
摘要翻译：自由活塞双向旋转装置被描述为特别适用于紧凑型，低RPM，高扭矩液压马达，但也可用于其它应用如旋转泵，旋转发动机等。旋转装置包括定子，同轴地安装用于相对于t旋转运动的转子

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