| 摘要 |
A turbo-gear supplied with operating fluid for driving a drill bit is proposed. It preferably comprises a non-rotatable casing, an upper shaft rotatably mounted in the casing, coupled with blades configured to receive pressure of the operating fluid causing rotation of the upper shaft, a lower shaft mounted in the casing, having inside a cylindrical channel, an intermediate shaft rotatably mounted in the casing, disposed below the upper shaft and above the lower shaft. The shafts are associated with each other through conventional gears having predetermined transmission coefficients. The inner space of the turbo-gear is configured to pass the operating fluid therethrough. Preferably, the turbo-gear is combined with a bushing-connector shaped as a hollow cylinder, having means for assembling with the turbo-gear and the bit. The turbo-gear is assembled with a non-rotatable string of pipes, through which the operating fluid is supplied. The turbo-gear allows extending the lifespan of pipes.
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