Patent ID: 7293340
Filing Date: 2007-11-13
Classification: B23Q,Y10T

Abstract:
1. A direct drive spindle assembly comprising: a main fork which is rotated about a first rotational axis and has a base and a parallel pair of spaced fork arms; a first drive means comprising a hollow housing concentric with the first rotational axis, a first motor stator and a first motor rotor that is accommodated in the first motor stator and is coupled with the base of the main fork for driving the main fork to rotate about the first rotational axis; a second drive means contained in a room between the fork arms of the main fork and having a second motor stator concentric with a second rotational axis, a second motor rotor and a rotor transmission ring inside the second motor rotor, wherein the second rotational axis is perpendicular to the first rotational axis and the second motor stator is coupled with the fork arms of the main fork; and a spindle box having an orthogonal cross-shaped structure of which a first arm is coupled with the second motor rotor by means of the rotor transmission ring, and of which spindle box a second arm is connected to a spindle head; which is characterized by that the above-mentioned paired fork arms are assembled to the second drive means before being combined with the base of the main fork.