| 摘要 |
A drive system includes a stator 60 which has a helical profile. Surrounding thestator 60 is a commutator which is connected to a flexible jacket 672 which has a helicalprofile of an opposite sense to the stator 60 helical profile. A fluid pathway is definedbetween the stator 60 helical profile and the helical profile of the flexible jacket 672, throughwhich fluid flows causing the flexible jacket 672 to deform. As this occurs the jacket 672adopts the helical profile of the stator 60 so converting a force delivered by the fluid to arotational force which provides forward drive with respect to the stator 60. The drive system may be included in a downhole tractor. |
