Air-foil bearing

An air-foil bearing comprising:

• a damper body having a front body portion, a rear body portion, and a front protruded portion protruded upward from the front body portion to have a flat protruded surface;
• a front welding plate in surface contact with the front body portion;
• a front top foil having a front first contact portion in surface contact with a top surface of the front protruded portion, and a front second contact portion which is a portion that is bent from the front first contact portion in surface contact with the front welding plate;
• a radial foil placed in, and secured to, a holding slot in the damper body;
• and
• a back plate in surface contact with the rear body portion.

An air-foil bearing comprising:

• a damper body having a front body portion, a rear body portion, a front protruded portion protruded upward from the front body portion to have a flat protruded surface, and a rear protruded portion protruded downward from the rear body portion to have a flat protruded surface;
• a front welding plate in surface contact with the front body portion;
• a front top foil having a front first contact portion in surface contact with a top surface of the front protruded portion, and a front second contact portion which is a portion that is bent from the front first contact portion in surface contact with the front welding plate;
• a rear welding plate in surface contact with the rear body portion;
• and
• a rear top foil having a rear first contact portion in surface contact with a top surface of the rear protruded portion, and a rear second contact portion which is a portion that is bent from the rear first contact portion in surface contact with the rear welding plate.