| 摘要 |
The present invention relates to a direct bit drive for deep drilling tools based on the Moineau principles. The drive is divided into two sections disposed end-to-end and co-axially in line, each with a defined helical working space between surfaces shaped in a manner of helical teeth, the said helical working spaces following oppositely turning helical paths and being arranged for the flow therethrough of the working medium, in axially opposite directions. In this manner, the axially thrust forces transmitted to the bit through the direct bit drive by working medium during a drilling operation are reduced.
|
