The invention discloses a manual-shift speed
reducer of a crowned-gear
clutch for large-size
petroleum drilling machines, which comprises a case, an input shaft
system, an output shaft
system, a shift operating mechanism, a lubricating
system, a ventilator system and a measuring rod system. A lower case, a middle case and an upper case are assembled from bottom to top vertically to form the case, the input shaft system, the output shaft system, the shift operating mechanism, the lubricating system, the ventilator system and the measuring rod system are arranged in the case, the input shaft system is used for inputting power and realizing high revolution speed, the output shaft system is used for outputting torque and realizing low revolution speed, and the shift operating mechanism is used for changing the
transmission ratio of the input shaft system to the output shaft system. The manual-shift speed
reducer of the crowned-gear
clutch for the large-size
petroleum drilling machines has wide applicable range of
environmental temperature, is capable of running on open sites full time, is wide in applicable range of
environmental temperature and has the advantages of high
bearing capacity, long service life, large output torque,
high transmission efficiency, low operation
noise and vibration of the case, fine tightness, high exchangeability, convenience in installation, flexibility and stability in shift.