HUB BEARING AND SEAL DEVICE THEREFOR

摘要

A hub bearing and a seal device therefor. The hub bearing seal device comprises a hub bearing inner ring (3), an outer ring (1), a ring-shaped seal (2), and a seal retaining ring (4). The seal retaining ring (4) is fixed to the inner ring (3) and the periphery of the seal (2) is fixed to the outer ring (1). A metallic framework (23) is provided inside the seal (2). The seal (2) is fixed to the outer ring via the metallic framework (23) and a seal lip edge (21) is provided on the metallic framework (23) of the seal (2). The seal lip edge (21) is in contact with the seal retaining ring (4) in interference fit. The seal (2) is also provided with another metallic framework (24) therein. The metallic framework (24) is arranged radially inside the metallic framework (23) and has a different thermal expansion coefficient from that of the metallic framework (23). The metallic framework (24) and the metallic framework (23) form a double metallic sheet type framework. During the operation of the seal device, the double metallic sheet type framework can adjust the magnitude of interference between the seal lip edge and the seal retaining ring dynamically according to temperature change.