MULTISTAGE REDUCER OF POWERED DRIVE OF DRILLING UNIT Russian patent published in 2018 - IPC E21B3/02 E21B19/08 

FIELD: soil or rock drilling.

SUBSTANCE: invention relates to drilling units with an upper rotational power drive that are used in drilling oil and gas wells. Multistage reducer of the top power drive of the drilling rig contains a low-speed output shaft located in the body parts, two intermediate shafts-gears, one high-speed input shaft with a gear wheel, bearing units, primary intermediate shaft-gear. Gear drives are mounted in the form of three reduction stages. First reduction stage is a high-speed input shaft on which a skew gear is installed, meshed with a skew gear of the primary intermediate shaft-gear. Second stage is a primary intermediate shaft-gear on which the gear engages with two skew gears mounted on the two secondary intermediate shafts-gears. Third stage represents intermediate shaft-gears, on which spur gears, which are engaged with a spur gear of a low-speed output shaft, are installed. Secondary intermediate shaft-gears are equipped with adjusting units and installed with the possibility of axial movement together with lower bearing supports. High-speed input shaft, primary intermediate shaft-gear and slow output shaft are installed parallelly and are located in mutually perpendicular planes with secondary intermediate shaft-gears.

EFFECT: reduction of the reducer overall dimensions is ensured, and the reliability of its operation is increased.

1 cl, 4 dwg