an industrial robot and an industrial robot transmission system for the transmission of movement to a robot part , including a motor and a gearbox containing a lubricant . the gearbox is provided with an integrated moisture absorbing device including a moisture absorbing material adapted to absorb moisture contained in the gearbox . the invention is also related to a method for preventing the deterioration of a lubricant due to absorption of moisture , inside an industrial robot used in surroundings with high humidity , which is characterized by integrating a moisture absorbing device including a moisture absorbing material in a robot part containing the lubricant .