Method and device for estimating service life of tension roller speed reducer bearing

The invention discloses a method and a device for estimating the service life of a bearing of a tension roller speed reducer. The method comprises the following steps: acquiring parameter data of thespeed reducer; according to the parameter data, obtaining the circumferential force of a helical gear of a high-speed input shaft of the speed reducer; then obtaining the radial force and the axial force of the helical gear and the equivalent radial force of the helical gear; acquiring the circumferential force, the radial force and the axial force of the current bearing; and finally, according tothe equivalent radial force, the circumferential force of the current bearing, the radial force of the current bearing, the axial force of the current bearing and the axial load coefficient and the radial load coefficient of the current bearing, determining the number of bearing turns of the current bearing under the rated load. According to the method, the service life of the bearing is quantified in the form of the numb