Transmission device

The utility model discloses a transmission device, including cylinder, mount pad and be used for sealing cylinder's fixed cover, fixed cover suit is on the cylinder, the cylinder is rotatable to be installed on the mount pad, the one end that the mount pad is close to fixed cover is equipped with inner tube and urceolus, fixed cover is close to the outside protrusion in one side of mount pad and stretches into in the cavity between inner tube and the urceolus to cooperation inner tube and urceolus form labyrinth channel, labyrinth channel's bottom is equipped with the sediment outflow passageway. This transmission device tentatively locks roller sleeve at the fixed cover of the both ends of cylinder suit, recycles fixed cover cooperation inner tube and urceolus and forms labyrinth channeltogether, utilizes labyrinth channel can effectively prevent the rotation junction that outside grit or impurity entered into cylinder and mount pad, is equipped with the sediment outflow passageway in labyrinth channel's bot