Sealing structure for steering bearing

A sealing structure for a steering bearing, comprising:

• a plastic upper cover;
• a rotating assembly;
• a plastic lower cover;
• an inner seal retainer;
• and
• an outer seal retainer;
• wherein the rotating assembly is arranged inside the plastic upper cover;
• the plastic lower cover is rotatably connected to the plastic upper cover through the rotating assembly;
• the inner seal retainer is arranged at a connection between an inner side of the plastic upper cover and an inner side of the plastic lower cover to seal the inner side of the plastic upper cover and the inner side of the plastic lower cover;
• and
• the outer seal retainer is arranged at a connection between an outer side of the plastic upper cover and an outer side of the plastic lower cover to seal the outer side of the plastic upper cover and the outer side of the plastic lower cover;
• the rotating assembly comprises an upper track, a lower track, a retaining frame, a steel ball, an outer sealing lip, a mounting groove and a rectangular groove;
• the upper track is attached to the plastic upper cover;
• the lower track is attached to the plastic lower cover;
• the retaining frame is arranged between the upper track and the lower track;
• the steel ball is arranged on the retaining frame, and is configured to rotate while abutting against the upper track and the lower track;
• the outer sealing lip is arranged on the inner side of the plastic upper cover, and is configured as an annular protrusion along a radial direction of the plastic upper cover;
• and the outer sealing lip is matchedly connected to the outer seal retainer;
• the mounting groove is arranged on the plastic lower cover, and is configured to accommodate the outer seal retainer and the inner seal retainer;
• the rectangular groove is arranged on the inner side of the plastic upper cover;
• the outer seal retainer comprises an outer sealing ring;
• and the outer sealing ring is arranged at the mounting groove, and is provided with three first retaining plates;
• two of the three first retaining plates are respectively arranged at axial two sides of the outer sealing lip, and are in interference contact with the plastic upper cover at the axial two sides of the outer sealing lip;
• and the rest one of the three first retaining plates is in interference contact with the inner side of the plastic upper cover;
• and
• the inner seal retainer comprises an inner sealing ring;
• and the inner sealing ring is arranged on the mounting groove, and is provided with two second retaining plates;
• one of the two second retaining plates is in interference contact with the inner side of the plastic upper cover;
• and the other of the two second retaining plates is in interference contact with the rectangular groove on the inner side of the plastic upper cover to enable multi-layer sealing.