The present invention relates to a spindle drive.
A spindle drive according to an exemplary embodiment of the present invention includes: a body 12 that is disposed at a side of a machine tool; a spindle 10 that is disposed at the body, with a ring gear 16 disposed thereunder; a gear box 20 that is disposed at a side of the body 12; a plurality of driven shafts 40 that is disposed at the gear box 20 and engaged with the ring gear 16; an idle shaft 30 that is disposed at the gear box 20 and engaged with a plurality of driven gears 42 at a side; a high-speed driving shaft 22 that is disposed at the gear box 20 and drives the idle shaft 30 while changing the speed by a driving force of a spindle motor 26; a low-speed driving gear 80 that is disposed at the gear box 20, engaged with the driven shafts 40, and pressed by a pressing unit 60 such that backlash is removed; a decelerator 50 that is disposed at the low-speed driving gear 80 and driven by a servomotor 52 to drive the low-speed driving gear 80; and a clutch unit 90 that is disposed between the servomotor 52 and the low-speed driving gear 80 and controls power transmission of the servomotor.