一、机械无级调速式牵引部的设想采煤机牵引部广泛采用油泵—油马达系统,是由于液压具有实现无级调速和过载保护简单、布置灵活的特点。但在矿井工作面使用中,煤岩粉尘污染严重,油质很难经常保持清洁,易出故障,出了故障又不易判断和处理。因此在七十年代英国AM和BJD公司、八十年代美国发依尔契丹耳德公司针对 First, the mechanical stepless speed traction Department of the idea Shearer widely used pump traction - oil motor system is due to the hydraulic stepless speed regulation and overload protection to achieve a simple, flexible layout features. However, the use of coal mine face, coal dust pollution is serious, it is difficult to keep the oil often clean, easy to fail, the failure is not easy to judge and deal with. Therefore, in the seventies British AM and BJD companies, the United States made in the 1980s Irkidande company for