Double-row tapered roller bearing for urban rail transit axle box

The invention discloses a double-row tapered roller bearing for an urban rail transit axle box. The double-row tapered roller bearing comprises an outer ring, an inner ring, rollers, a middle space ring, a retainer and a sealing assembly, two rows of outer ring conical raceway surfaces are arranged in the outer ring; the outer diameter surfaces of the two inner rings are provided with inner ring conical raceway surfaces, and the two sides are provided with inner ring flanges; the two rows of rollers are arranged, and the generatrix of the two rollers is a convexity curve; the middle space ring is arranged between the two rows of inner rings; the retainer is arranged between the outer ring and the inner ring; retainer pockets for uniformly distributing the plurality of rollers in the circumferential direction are formed in the retainer; the sealing assemblies are arranged at the two ends of the outer ring. The double-row tapered roller bearing has the advantages of impact resistance, long service life and the