Power transmission unit of an industrial robot arm

FIG. 1 is a perspective view of power transmission unit of an industrial robot arm showing my new design;

FIG. 2 is a front view thereof;

FIG. 3 is a rear view thereof;

FIG. 4 is a top plan view thereof;

FIG. 5 is a bottom plan view thereof;

FIG. 6 is a right side view thereof;

FIG. 7 is a left side view thereof; and,

FIG. 8 is a cross-sectional view taken along line 8 - 8 in FIG. 5 with the internal structure omitted.

The broken lines illustrate portions of the power transmission unit of an industrial robot arm and form no part of the claimed design.