The device comprises an upper sealing block, a lower sealing block and a sealing device;

By the analysis of the mechanics conditions on the gears in Compound gear Motor, the formula of the instantaneous radial forces acting on all gears and seal block are obtained.

Under the seal block plays a sealing effect between the hooked rabbet and the glide path, can be useful to avoid splashing in the attack scene shake load under the effect of using three epdm.