| 摘要 |
<p>The method involves controlling a sealing element of a closed loop hydraulic circuit in forward direction in order to suppress hydraulic braking force exerted onto a toothed wheel (1). The sealing element is controlled in reverse direction in order to increase the hydraulic braking force exerted onto the toothed wheel, where braking phases of the toothed wheel are alternated with releasing phases of the toothed wheel during rotation of drilling bit. An independent claim is also included for a drilling-bit.</p> |
