High-speed dynamic seal sealing structure of aero-engine accessory transmission gear box

The invention discloses a high-speed dynamic seal sealing structure of an aero-engine accessory transmission gear box, and belongs to the technical field of engine sealing. Comprising an accessory casing body and an end cover which are connected through bolts from top to bottom, a high-speed input shaft is arranged to penetrate through the accessory casing body and the end cover from top to bottom, and an outer lip type framework oil seal and a bearing are sequentially arranged on the outer wall of the high-speed input shaft from bottom to top. The outer lip type framework oil seal and an inner ring of the bearing are both in interference fit with the high-speed input shaft, and the contact face of the outer lip type framework oil seal and the end cover is arranged to be an inclined face. And the bearing is fixed on the outer wall of the high-speed input shaft through a bearing seat arranged on the accessory case body. By the adoption of the structure, lip inner sealing is changed into lip outer sealing, the