| 摘要 |
This invention relates to a pump and hydraulic or pneumatic motor comprising a flexible tubular shell enclosed within a closed rigid cylindrical shell of oblong circular cross section wherein said flexible tubular shell is stretched around four revolving rollers, each pair of said four revolving rollers are diametrically and rotatably disposed about each of two drive shafts located on the plane including the major axis of said oblong circular cross section at two diametrically opposite position with respect to the plane including the minor axis of said oblong circular cross section. Said two pairs of the revolving rollers are linked to one another to rotate in two opposite directions at the same phase, which motion of the revolving rollers generates a cyclically repeating movement on said flexible tubular shell substantially equal to the advancing motion of the tubular diaphragm propagating in the direction parallel to the minor axis of said oblong circular cross section of the rigid cylindrical shell, which movement is employed for pumping or motor action.
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