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实用新型
CN204127093U 可安装防冲蚀帽的螺杆钻具传动轴 失效 - 权利终止

可安装防冲蚀帽的螺杆钻具传动轴
摘要：
本实用新型公开了一种可安装防冲蚀帽的螺杆钻具传动轴，包括轴本体，所述轴本体的右端内径增大从而在所述轴本体的内壁上形成一台阶，所述台阶右侧的所述内壁上加工有内螺纹，所述内螺纹右侧的所述内壁内径继续增大并通过一弧面过渡至一限位台阶。本实用新型中的传动轴结构，与防冲蚀帽配合，能够减少传动轴本身受钻井液冲蚀、提高传动轴耐用性。
摘要（英）：

The utility model discloses a screw drilling tool transmission shaft with an erosion prevention cap mountable. The screw drilling tool transmission shaft comprises a shaft body, the inner diameter of the right end of the shaft body is increased so that a step can be formed on the inner wall of the shaft body, internal threads are machined on the inner wall on the right side of the step, and the inner diameter of the inner wall on the right side of the internal threads continues to be increased and is in transition to a limiting step through a cambered surface. The transmission shaft is matched with the erosion prevention cap, so the probability that the transmission shaft is eroded by drilling fluid can be lowered, and durability of the transmission shaft can be improved.

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