Sealing apparatus

A sealing apparatus comprising:

• an annular reinforcing ring centered about an axis;
• and
• an annular elastic body part comprising a seal lip, attached to the reinforcing ring, made of elastomer, and centered about the axis, wherein
• the seal lip comprises a lip tip portion projecting toward an inner periphery side and defined by an annular sealing side surface on a sealed object side and an annular atmospheric side surface on a non-sealed object side, the sealing side surface and the atmospheric side surface are connected through a lip tip,
• the lip tip portion comprises a circumferential projection and a screw portion capable of forming an airflow flowing toward the sealed object side, on the atmospheric side surface,
• the screw portion comprises a plurality of sealed object side screw projections obliquely extending with respect to the lip tip and projecting from the atmospheric side surface;
• and a plurality of non-sealed object side screw projections obliquely extending with respect to the lip tip and projecting from the atmospheric side surface,
• the circumferential projection annularly projects from the atmospheric side surface and extends parallel to the lip tip, and the circumferential projection has a height from the atmospheric side surface less than the height of each of the sealed object side screw projections and the non-sealed object side screw projections from the atmospheric side surface, and
• the sealed object side screw projections extend between the lip tip and the circumferential projection and are arranged at equal pitch intervals in parallel with each other, the non-sealed object side screw projections extend from the circumferential projection to the non-sealed object side and are arranged at equal pitch intervals in parallel with each other, and each of the non-sealed object side screw projections does not overlap the adjacent non-sealed object side screw projections in a direction of the axis with each other.