Diaphragm spring and pressing block pre-tightening mechanism with long fatigue life

The utility model relates to the technical field of electric power steering systems, in particular to a diaphragm spring and pressing block pre-tightening mechanism with long fatigue life, which comprises a diaphragm spring, a pressing block and an adjusting nut, the bottom of the adjusting nut is provided with the diaphragm spring, the diaphragm spring is positioned between the adjusting nut and the pressing block, and the diaphragm spring is of a circular ring structure. A height difference exists between the inner ring and the outer ring of the diaphragm spring, the inner ring of the diaphragm spring is arranged on the pressing block in a sleeving mode, and the outer ring of the diaphragm spring is clamped by the adjusting nut and the pressing block. Compared with the prior art, the height difference exists between the inner ring and the outer ring of the diaphragm spring, the boss structure is matched, large rigidity is provided at the initial stage of deformation, after certain deformation, the diaphragm