Hub bearing and seal device

A seal device for a hub bearing, comprising:

• a hub bearing inner ring and a hub bearing outer ring;
• a ring-shaped seal and a seal retaining ring;
• the seal retaining ring being fixed to the inner ring and an outer circumference of the seal being fixed to the outer ring;
• a first metallic framework, with which the outer circumference of the seal is fixed to the outer ring, the seal being provided with a seal lip edge on the metallic framework, and the seal lip edge being brought into contact with the seal retaining ring in interference fit;
• a second metallic framework, which is arranged radially inside the first metallic framework, and has a different thermal expansion coefficient from that of the first metallic framework, the first and second metallic frameworks forming a bimetallic sheet type framework;
• and
• the bimetallic sheet type framework being configured to dynamically adjust an amount of interference between the seal lip edge and the seal retaining ring as the temperature changes when the seal device is in operation.

A method of controlling an interference fit between a seal lip edge and a seal retaining ring in a hub bearing, comprising:

• injection molding a seal lip edge of a sealing ring onto a bimetallic sheet type framework, the bimetallic sheet type framework including:
• a first metallic framework, with which an outer circumference of the sealing ring is fixed to a hub bearing outer ring, the seal being provided with a seal lip edge on the metallic framework, and the seal lip edge being brought into contact with a seal retaining ring fixed to a hub bearing inner ring in interference fit;
• a second metallic framework, which is arranged radially inside the first metallic framework, and has a different thermal expansion coefficient from that of the first metallic framework;
• and
• dynamically adjusting an amount of interference between the seal lip edge and the seal retaining ring in response to a temperature change of the hub bearing.