Patent ID: 8956093
Filing Date: 2015-02-17
Classification: B23Q,Y10T

Abstract:
1. An arrangement for sealing a pressurized coolant system for a drawbar cylinder rod and a spindle drawbar in a machine tool, the arrangement comprising: a spindle; a drawbar mounted in the spindle having an axial passage for pressurized coolant; a pulley mounted on the spindle for driving the spindle; a drawbar cylinder comprising a piston plate and a drawbar cylinder rod; and, a seal assembly surrounding a portion of the drawbar cylinder rod; the seal assembly comprising: a non-rotating seal; a rotary seal that rotates with the spindle; a planar sealing surface formed by the contact between the non-rotating seal and the rotary seal, whereby a reliable fluid seal is formed between the rotating and the non-rotating structures of the pressurized coolant system; and, a stable mounting structure attached to the pulley for mounting the rotary seal, whereby the stable mounting structure rotates on-axis with the pulley and the spindle.