1.超低速拖拉机超低速作业,是拖拉机作业负荷超过一般作业负荷(作业阻力大)时,如开深沟、超深松及联合作业等,需要以100～300 m/h速度作业,这就需要给拖拉机加一个超低速变速装置,这个变速装置的传动比应为1:30～1:20。国外著名品牌拖拉机如维美德、迪尔等均带有时速为0.6～2.0 km/h的超低速装置。目前,我国已有经改制可进行超低速作业的拖拉机,其行驶速度与功率见表1。 1. Ultra-low-speed tractor ultra-low-speed operation, the tractor operating load exceeds the general operating load (operating resistance large), such as open ditch, super subsoiling and joint operations, etc., need to 100 ~ 300 m / h speed operation, Need to add a tractor ultra-low speed transmission, the transmission ratio should be 1:30 ~ 1:20. Well-known foreign brands tractors such as Valmet, Deere and so on with a speed of 0.6 ~ 2.0 km / h ultra-low speed device. At present, China has tractors that have been converted to ultra-low speed operation. Table 1 shows the traveling speed and power.