Patent ID: 8516920

Claim:
A robot arm assembly, comprising: a wrist housing, the wrist housing being hollow and comprising a main bracket, and two support arms parallelly extending out from an end of the main bracket along a direction parallel to two sides of the main bracket; a wrist rotatably connected to the wrist housing along a first axis and assembled between the two support arms of the wrist housing, the wrist comprising a first sleeve body and a second sleeve body substantially perpendicularly intersecting with the first sleeve body, two ends of the first sleeve body being rotatably assembled to the two support arms, respectively, the two ends of the first sleeve body respectively defining a first shaft hole and a second shaft hole along the first axis; a first driver assembled within the wrist housing for driving the wrist to rotate relative to the wrist housing; a first transmission mechanism assembled within the wrist housing for transferring a rotation movement of the first driver to the wrist; a rotary member rotatably assembled to a distal end of the second sleeve body of the wrist; a second driver assembled within the wrist housing for driving the rotary member to rotate along a second rotary axis; and a second transmission mechanism assembled within the wrist housing, for transferring a rotation movement of the second driver to the rotary member, wherein the second transmission mechanism comprises a second rotary shaft rotatably assembled into the first shaft hole and the second shaft hole of the first sleeve body by opposite ends, the rotary member is connected to the second rotary shaft, the second driver is mounted upon the first driver, and output ends of the first driver and the second driver extend away from each other.