| 摘要 |
<p>A top drive apparatus for drilling a bore hole, the top drive apparatus comprising a main body (17), a motor apparatus (14), a main shaft (110) and a member (24,26) depending from the main shaft (110) characterised in that said main shaft (110) comprises a torque transfer apparatus (116,126) for transferring torque between said main shaft (110) and said member (24,26) and a separate load transfer apparatus (114,142) for transferring load between said main shaft (110) and said member (24,26).</p> |
