Patent ID: 9581192
Date: 2017-02-28
CPC Classifications: B60B,F16C

Claim:
1. A double-row tapered-roller bearing unit, comprising: an outer-diameter-side raceway member having a first outer-ring raceway and a second outer-ring raceway formed on the inner-circumferential surface thereof, the first outer-ring raceway and the second outer-ring raceway having partial conical surfaces inclined in directions so that the diameters become larger going in directions away from each other in the axial direction; an inner-diameter-side raceway member having a first inner-ring raceway and a second inner-ring raceway formed on the outer-circumferential surface thereof, the first inner-ring raceway and the second inner-ring raceway having partial conical surfaces inclined in directions so that the diameters become larger going in directions away from each other in the axial direction; and plural tapered rollers rotatably provided respectively between the first outer-ring raceway and the first inner-ring raceway, and between the second outer-ring raceway and the second inner-ring raceway; and the inner-diameter-side raceway member comprising a first inner ring with the first inner-ring raceway formed on the outer-circumferential surface thereof, a second inner ring with the second inner-ring raceway formed on the outer-circumferential surface thereof, and a shaft member; the first inner ring and the second inner ring press-fitted onto the shaft member; and the first inner ring and the second inner ring connected and fastened to the shaft member by securing the large-diameter-side end surface of the first inner ring by a crimped section formed by elastically deforming one end section in the axial direction of the shaft member, and the relationship of the inclination angle θ the inclination angle θ the amount of decrease δθ the amount of decrease δθ the amount of increase δθ the press-fit interference ΔX the press-fit interference ΔX satisfying the equation and the inclination angle φ