Patent ID: 8511199

Claim:
A robot arm assembly, comprising: a connecting arm comprising a substantially U-shaped connecting body, wherein the connecting body comprises two substantially parallel side plates and a bottom plate connected with the two side plates, and the two side plates and the bottom plate cooperatively define a receiving space; a support arm located at one end of the connecting body of the connecting arm, the support arm comprising: a main body, a rotary connecting portion cross jointed with the main body, a first gear, a second gear, a third gear, a fourth gear, and a first reducer assembled within the rotary connecting portion, wherein the rotary connecting portion is received in the receiving space of the connecting body, the first gear and the second gear are rotatably assembled within the main body, the third and fourth gears are respectively assembled within two ends of the rotary connecting portion and respectively engaged with the first and second gears, the first reducer comprises an input shaft and an output shaft, the input shaft is fixed with the fourth gear, and the output shaft is securely connected with an inner wall of one of the two side plates of the connecting arm, such that the connecting arm is rotatable along a first axis relative to the support arm, and the one of the two side plates covers the output shaft; and an end arm rotatably assembled to another end of the connecting body of the connecting arm along a second axis substantially perpendicular to the first axis relative to the end arm.