Adjustable pre-tightening force machine tool spindle structure

Abstract

The utility model discloses a kind of machine tool spindle structures of adjustable pre-tightening force, including shell, shaft core, inner spacer ring, outer spacer ring, left bearing, right bearing and adjusting mechanism, the shaft core is arranged in shell interior, the inner spacer ring is sleeved in the outside of shaft core, the outer spacer ring is sleeved in the right position of the outside of inner spacer ring, the left bearing and right bearing are all sleeved in the outside of shaft core and respectively located the both ends of inner spacer ring, the adjusting mechanism is arranged in the outside of inner spacer ring and located the position between left bearing and outer spacer ring, oil inlet is opened in the shell, the oil inlet is communicated with adjusting mechanism. The utility model can actively adjust the pre-tightening force of main shaft bearing by adjusting mechanism, without manual intervention, can ensure that main shaft pre-tightening force is always in more suitable state, avoid pre-tightening force too large to cause bearing wear and shorten service life, or because of pre-tightening force deficiency and cause main shaft vibration and other problems, can make main shaft adapt to more working condition, process more different types of material.

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