Gearbox sealing piston injection mold

The utility model discloses a gearbox sealing piston injection mold which comprises a mold body, the mold body is composed of an upper mold core, a lower mold core and an injection structure, the injection structure is installed on the upper mold core, and a runner structure is installed on the lower mold core; the sub-runner structure is composed of a base and two gaskets, the two gaskets are installed on the base, and a middle injection point is arranged on the base. Through the mode, according to the injection mold for the sealing piston of the gearbox, the injection mold is designed for sealing lips in multiple areas, the sealing areas are completely separated, and umbrella-shaped annular injection is replaced by sub-runner structure injection, so that gas in a mold cavity can be stored in a gas well or discharged out of the cavity in the injection process; therefore, the lip area is guaranteed to be smooth and free of any tiny bubbles, the sealing effect is guaranteed, and the piston oil seal is stable i