Sealing device

A sealing device configured to be provided for a mechanical apparatus having an inner member with a flange portion continuously enlarging in a diametrical direction and an outer member rotating relative to the inner member around a shaft of the mechanical apparatus, the sealing device being configured to seal a gap between the flange portion and an end face of the outer member facing the flange portion and between the outer member and the inner member by being attached to the outer member,

• the sealing device comprising:
• a core member attached to the outer member;
• a seal body fixed to the core member;
• and
• a metal ring having a cylindrical portion fitted to the inner member and having a circular plate portion extending outward in a diametrical direction from an end portion on the flange portion side of the cylindrical portion;
• the circular plate portion having an extending portion extending opposite to the flange portion;
• the seal body having a projecting portion and a weir portion, the projecting portion being positioned inward in a diametrical direction from the extending portion and extending toward the flange portion, the weir portion being positioned outward in a diametrical direction from the extending portion and extending toward the flange portion,
• the projecting portion and the weir portion overlapping the extending portion in a diametrical direction, the projecting portion and the weir portion being provided adjacent to the extending portion, thereby forming a labyrinth, the labyrinth having a plurality of labyrinth constituting portions folding back along inner and outer faces of the extending portion in a diametrical direction, the labyrinth being configured to meander to prevent entry of muddy water, and the core member having a cylindrical portion and a circular plate portion, the cylindrical portion extending inward in the axial direction from an end portion of the cylindrical portion of the core member, the circular plate portion extending inward in a diametrical direction from the end portion of the cylindrical portion of the core member,
• wherein the weir portion projects from the end portion of the cylindrical portion of the core member outward in the axial direction and toward a direction opposite to the direction to which the cylindrical portion of the core member extends in the axial direction, and a projection length of the weir portion in the axial direction from the end portion of the cylindrical portion of the core member is equal to or more than a projection length of the projecting portion in the axial direction, and
• a length of the labyrinth between the projecting portion and the circular plate portion of the metal ring in the axial direction is smaller than a length of the labyrinth in the diametrical direction.