Patent ID: 8794883

Claim:
A rotary spindle head with gear reducer, comprising: a rotary spindle unit, composed of a spindle having a cutting tool mounted thereon and a rotary seat; a fork-shaped spindle base, disposed to the machine tool and is rotatably connecting to the rotary spindle unit; and a driving unit, having a torque motor and a gear reducer coaxially coupled to the torque motor; wherein the structure of the coaxially disposed torque motor and the gear reducer is coupled to the fork-shaped spindle base while enabling the gear reducer to further couple to the rotary spindle unit for bringing along the rotary spindle unit to rotate inside the fork-shaped spindle base; and wherein the gear reducer is primarily composed of: a driving gear, at least one idle gear, a ring gear and an axle seat, in a manner that the driving gear is configured to be driven by the torque motor; the at least one idle gear is mesh respectively with the driving gear and the ring gear while being pivotally coupled to an axial part; the ring gear is disposed coaxially with the driving gear and is coupled to the rotary spindle unit by the use of an axis that is formed at a side of the ring gear for bringing along the rotary spindle unit to rotate accordingly.