The invention discloses a main driving device for a vertical milling
machine, which has wide speed regulation range and can achieve axial feeding and good
lubrication effect, wherein the main driving device comprises a main motor, a drive housing, an elastic coupler, an oil basin, a first transmission shaft, a
cycloid pump, a second transmission shaft, a second shaft gear, a triple gear, a third transmission shaft, a change gear, a fourth transmission shaft, a duplicate gear, a change gear, a fifth transmission shaft, a change gear, a
bevel gear and a vertical shaft; a first shaft gear is arranged on the first transmission shaft; the
bevel gear is arranged at one end of the vertical shaft; a
skew gear is arranged at the other end of the vertical shaft; a main shaft is arranged on one side of the vertical shaft; and a spline housing and the
skew gear are arranged on the outer side of the main shaft. The main driving device has the advantages as follows: the main shaft can obtain 12-level rotational speed within 35 to 1500 rpm (
Revolutions Per Minute) through a 3*2*2
structural formula, and the speed regulation range is wide; the main shaft and the spline housing are connected through a spline, and the main shaft can move upwards and downwards in the spline housing in the axial direction; in addition, the
cycloid pump is installed at one end of the first transmission shaft,
lubricant in the oil basin in the drive housing can be conveyed to lubricating points on the gears and bearings through an oil line with the help of the power of the first transmission shaft, and the
lubrication effect is good.