Casting aluminum alloy wheel edge decelerator shell structure

The utility model relates to a shell body structure of a speed reducing device, in particular to a shell body structure of a casting aluminum alloy round-reducer, comprising an aluminum alloy shell main body, an upper master pin pedestal and a lower master pin pedestal. The shell body structure is characterized in that a run-through margin is added on the outline of the main body, the upper master pin pedestal and the lower master pin pedestal are directly connected by the margin, and a window of a driven gear wheel is arranged on the bottom of the aluminum alloy shell main body. The shell body structure can largely reduce the weight of the round-reducer and guarantee intensity, security and reliability simultaneously, thereby enhancing the smooth, the dynamic and the carrying capacities during the traveling of the vehicle.