Device and method for measuring friction torque of rolling bearing

The invention discloses a device and a method for measuring friction torque of a rolling bearing. Aiming at the problems that the existing rolling bearing friction torque measuring method is low in precision and difficult to assess the performance of a rolling bearing precisely, the device comprises a motor, a lead screw sliding table, an S-type force sensor, friction block mounting angle aluminum, a friction block, a chuck, a shaft, a sleeve, a linear guide rail, a grating disc, a photoelectric detecting device and a bottom plate. According to the device, the motor drives the lead screw sliding table to drive the friction block to move, the friction energy in the bearing is equivalent to the friction work between the friction block and the sleeve, the variation of a frictional force is measured by means of the strain type force sensor, such that the measurement of the friction work is more precise, a number of pulse signals of a photoelectric encoder at the outer edge of the sleeve isrecorded by means of a p