DIVIDED DRIVE SINGLE SPINDLE CRANKSHAFT MACHINE

摘要

A machine for machining the crankshaft pin bearing surfaces of a crankshaft, such as used in internal combustion engines, wherein rotatable headstock and tailstock spindles support and rotate the crankshaft during machining and tool positioning is accomplished through a master crankshaft rotated in unison with the spindles. To overcome inaccuracies resulting from gear play and cutting tool reaction forces, a portion of the torque driving the headstock and tailstock spindles is transmitted through the master crankshaft, however, the torque transmitted through the master crankshaft is limited to that necessary to overcome adverse reaction cutting forces, and the remainder of the driving torque required during machining is transmitted through a gear train directly interconnecting the headstock and tailstock spindles. Two gear trains driven from a common motor are employed to drive the crankshaft machine spindles, and torque divider means determines the amount of torque transmitted by the respective gear trains.