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1·The outer cup includes a major diameter mounting flange portion terminating in a curl, a minor diameter wear sleeve portion, and a transition portion joining the major and minor diameter portions.

外层杯包括大直径延伸段在卷曲的部分，一小直径套管磨损部分终止，并加入一个过渡的部分主要和次要直径部分。

2·The milling driving device is characterized in that the mill principal axis is directly connected with the output shaft of the hydraulic motor by a joining sleeve.

本实用新型可使整个铣刀主轴组件结构简单、紧凑、 具有很强的实用性。