Patent ID: 8429996

Claim:
A robot arm assembly, comprising: a first robot arm comprising a first sleeve, a first input shaft and a second input shaft, wherein the first sleeve comprises a straight sleeve section and an arc sleeve section connected to an end of the straight section, and the first input shaft and the second input shaft are seated in the straight sleeve section; and a second robot arm rotatably connected to the first robot arm, the second robot arm comprising a second sleeve and an output shaft received in the second sleeve; wherein the first input shaft is connected to the second sleeve via a pair of bevel gears, and drives the second sleeve to rotate relative to the first sleeve, one of the pair of bevel gears connecting the first input shaft to the second sleeve is fixed to an end of the first input shaft, and the other one of the pair of bevel gears connecting the first input shaft to the second sleeve is rotatably positioned in the arc sleeve section; the second input shaft is connected to the output shaft via at least two pairs of bevel gears, and drives the output shaft to rotate relative to the second sleeve.