Structural Design and Reliability Research of Cutting Reducer for Horizontal Axis Roadway Driving Machine

Objective To address the issues of high failure rate of high-speed shafts and output mechanisms, serious oil leakage of floating seals, and high oil temperature in the gearbox of current high-power horizontal axis roadway driving machine cutting reducers, a new type of cutting reducer structure with high reliability was designed to improve its operational stability and service life. Methods A four-stage transmission system composed of helical gear transmission, bevel gear transmission, NGW planetary transmission, and fixed shaft train was adopted to achieve power transmission and speed reduction. A sealing structure combining metal seal rings and dust seals was used, with V-rings and labyrinth rings arranged to enhance the dustproof and wear resistance of the floating seal. An independent forced lubrication and cooling system and a multi-chamber separation structure were designed to provide directional cooling and lubrication for key transmission components, thereby controlling the overall oil temperature. Results The designed reducer structure achieved a highly reliable connection with the drum, effectively preventing dust intrusion and lubricating oil leakage. The multi-chamber design and forced cooling system significantly reduced local oil temperature, avoiding premature failure of seals caused by high temperature. Conclusion The structural design of this horizontal axis roadway driving machine cutting reducer is reasonable, effectively solving engineering problems such as oil leakage, high temperature, and inconvenient maintenance. It has high practical value and reliability, and is suitable for driving operations under high-power and hard rock conditions.