Oil return structure of oil seal of gear box and oil return pipe thereof

The invention discloses an oil return structure of an oil seal of a gear box and an oil return pipe thereof, wherein leakage of lubricating oil and oil mist can be prevented effectively. The oil return pipe of the oil seal is L-shaped integrally. An oil inlet is formed in the high end of the oil return pipe, an oil return port is formed in the low end of the oil return pipe, a height difference His formed between the oil inlet and the oil return port, and the part below the oil return port of the oil return pipe forms an oil storage area for storing lubricating oil and preventing leakage of oil mist. The oil return structure of the oil seal of the gear box comprises a box body, the oil seal and the oil return pipe. An oil return hole is formed in the bottom of the oil seal, a drainage hole is axially formed in the box body, one end of the drainage hole communicates to the oil return hole, and the other end of the drainage hole communicates to the oil inlet of the oil return pipe. 本发明公开了一种齿轮箱的油封回油结构及其回油管，可以有效防