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1·Wherein the screw comprises a screw head, a lug boss and a screw rod.

该螺丝包括一螺头、一凸台及一螺杆。

2·The lug boss is completely arranged in an annular groove at the right end of the piston head.

所述凸台全部置于所述活塞头右端的环状槽内。

3·The side of the lock-up set is provided with a semicircle lug boss, which is allocated with the semicircle groove arranged on the shell.

锁止套周侧设置半圆凸台，半圆凸台与设置在壳体上的半圆凹槽相配置。

4·An O-shaped elastic pad made of anti-corrosion silicon rubber materials is arranged between the lug boss of the pole and the battery cover.

所述极柱的凸台与电池盖之间设置有防腐蚀硅橡胶材料制成的“O”字型弹性垫。

5·The lug boss is arranged between the screw head and the screw rod, and the external circumference of the lug boss is provided with a plurality of longitudinal grooves.

该凸台是设置在该螺头与该螺杆之间，其外周缘设有若干纵槽。

6·The lug boss can locate the lead sheath well. The lead sheath can prevent water, oil and so on from entering the interior of the electric motor from the wire outlet effectively.

凸台可很好地定位引线护套，通过引线护套和凸台的隔离， 可有效地防止水、油等从出线孔进入电机内部。