Zero-clearance assembly method for back-to-back tapered roller bearing

The invention relates to a zero-clearance assembly method for a back-to-back tapered roller bearing, which comprises the following steps: sequentially attaching an inner ring of a first bearing to be assembled, a spacer bush and an inner ring of a second bearing to obtain the distance from the outer side of the inner ring of the first bearing to the outer side of the inner ring of the second bearing, and recording the distance as T1; mounting the first bearing and the second bearing in the bearing mounting holes of the bearing seat to obtain T2; metering a clearance value T = T2-T1 + alpha; two gaskets with the thickness being T/2 are selected; and assembling the first bearing, the second bearing, the spacer bush and the gasket into the bearing mounting hole of the bearing seat. The assembly method is simple, scientific and effective, and the batch production problem of zero-clearance assembly of the back-to-back tapered roller bearing is solved; according to the assembly method, the clearance value of the ba