| 摘要 |
The invention relates to a drive system, in particular a downhole drilling assembly. A bearing mechanism of the assembly is isolated from a gear mechanism of the assembly, to prevent failure of the bearing mechanism due to vibration and heat generated by the gear mechanism in use. A lower bearing unit of the bearing mechanism is coupled to the gear mechanism by a shock eliminating coupling assembly. Also, the gear mechanism is coupled through a shock eliminating coupling assembly to a turbine. Sealing assemblies are provided for the gear mechanism and the upper bearing unit to prevent drilling fluid ingress and consequent damage. The assembly may also carry a torsionally flexible drive shaft.
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