| 摘要 |
<p>A rotary drill bit, particularly for deep-well drilling, comprising a body having a gauge region, a cutting surface which is defined by projecting cutting members supported at the outer periphery of the body on supporting members and nozzle passages through which flushing liquid can flow, and in which at least some of the nozzle passages comprise an outlet region which is directed towards the cutting members and which gives the jets of flushing liquid emerging therefrom an alignment with at least one component facing in the direction of the drillings flowing off along the outer face of the body.</p> |
