Output flange fastening device, gearbox and mining dump truck

The utility model discloses an output flange fastening device, a gearbox and a mining dump truck. A cover plate and a locking gasket are used on a traditional gearbox connecting output flange to replace an original gasket. The output flange and the cover plate are connected through a spline. And a locking gasket is additionally arranged between the cover plate and the nut. After the cover plate is additionally arranged, the spline structure prevents a part of gasket rotation caused by vibration, so that gasket failure is avoided, and the fastening effect on the nut is enhanced. Meanwhile, the O-shaped ring is additionally arranged on the structure, compared with a traditional gearbox output flange connecting structure, the sealing performance is enhanced, and then the working reliability of the part is guaranteed. 本实用新型公开了一种输出法兰紧固装置、变速箱及矿用自卸车，在传统的变速箱连接输出法兰上使用盖板和锁紧垫片来取代原有垫片。输出法兰和盖板通过花键连接。盖板与螺母之间加装锁紧垫片。在加入盖板后，花键结构阻止了一部分由于振动所导致的垫片的旋转，从而避免垫片失效，加强了对螺母的紧固效果。与此同时，该结构加装了O型圈，相较于传统的变速箱输出法兰连接结构，密封性能得到了加强，进而保证了该部件的工作可靠性。