AUTOMATIC TOOL EXCHANGE TYPE HIGH SPEED SPINDLE ASSEMBLY WITH BEARING PROTECTION STRUCTURE

摘要

The spindle assembly of this invention includes a draw bar installed in a shaft in such a manner that the draw bar moves toward a tool while compressing a disc spring when pushing force of an unclamping unit is applied to the draw bar during an automatic tool exchange process, at least one pair of bearings installed between the shaft and a bearing case, an outer wheel fixing unit fixed to the bearing case in order to restrict an outer wheel of a front bearing, and a stopper unit provided between an inner wheel fixing unit and the outer wheel fixing unit so as to restrict the movement of the inner wheel if the inner wheel moves more than an allowed distance. The outer wheel fixing unit is coupled to the bearing case while forming a gap capable of compensating for a thickness tolerance of the front bearing therebetween.