TWO-STEP 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 to drill oil and gas wells. Two-stage reducer of the top power drive of the drilling rig contains a low-speed output shaft located in the body parts, two intermediate shaft-gears, one high-speed input shaft with a gear wheel, bearing units. First reduction stage is made in the form of a high-speed input shaft on which a skew gear is disposed connected with two skew gears installed on two intermediate shafts symmetrically disposed relative to the rotation axis of the high-speed input shaft. Second stage of reduction includes spur gears installed on the intermediate shafts, which are connected with the spur gear of the low-speed output shaft. Intermediate shafts are axially displaceable, and in their lower bearing units there are adjusting units that regulate uniformity of the skew gear connection with the high-speed input shaft with two skew gears of the intermediate shafts. Axes of the high-speed input and low-speed output shafts and the axis of the intermediate shafts are parallel and located in mutually perpendicular planes.

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

1 cl, 3 dwg