| 摘要 |
<p>The present invention relates to a downhole driving unit (11) for insertion into a well, comprising a driving unit housing, a hydraulic motor (23) comprising a hydraulic motor housing (93), a wheel assembly (90) comprising a stationary part (91) and a rotational part (92), the stationary part being connected with the driving unit housing and being rotatably connected with a rotational part. The wheel assembly further comprises the hydraulic motor so that the stationary part and the rotational part constitute the hydraulic motor housing, the hydraulic motor (23) comprising a rotatable section (84) connected with the rotational part for rotating part of the wheel assembly. Furthermore, the wheel assembly comprises a planetary gearing system (95) comprised in the hydraulic motor housing and the hydraulic motor comprises a rotatable section connected with or forming part of a sun gear (96) of the planetary gearing system. The invention furthermore relates to a downhole system comprising the driving unit and to use of such driving unit.</p> |
