Engine main shaft bearing locking nut mounting tool and using method thereof

The invention discloses an engine main shaft bearing locking nut mounting tool and a using method thereof, and belongs to the technical field of machining. The bearing seat fixing base body is connected with the coaxial counter-force seat in an inserted mode. A coaxial counter-force pile is inserted into the coaxial counter-force seat, the coaxial counter-force pile is inserted into a torque multiplier, the torque multiplier is connected with a wrench, and a tightening sleeve is arranged on the outer side of the torque multiplier. The method comprises the following steps that a bearing outer ring is fixed to a bearing seat fixing base body, and a bearing locking nut is screwed into the bearing outer ring; a coaxial counter-force seat is installed on the bearing seat fixing base body; the coaxial counter-force pile is clamped into the coaxial counter-force seat; the tightening sleeve is clamped into the locking nut; a torsion multiplier is inserted into the coaxial counter-force pile and the tightening sleeve;