Sealing structure with torsional damper and oil seal

A sealing structure with a torsional damper and an oil seal, comprising:

• a hollow and annular annular member centered about an axis,
• wherein the torsional damper includes a hub, an annular mass body centered about the axis that covers an outer circumference of the hub, and a damper elastic body that is disposed between the hub and the mass body and elastically connects the hub and the mass body to each other, the torsional damper being attached to one end of a rotary shaft with the hub being inserted in a through-hole of an attachment target part,
• the annular member is formed to be capable of being fitted into the through-hole of the attachment target part and has an annular protrusion centered about the axis,
• the oil seal includes an annular seal lip centered about the axis and is attached in the through-hole of the attachment target part via the annular member to seal between the hub and the through-hole of the attachment target part,
• the hub includes an annular boss part centered about the axis, an annular rim part centered about the axis that is located at an outer periphery of the boss part, a disk-shaped disk part centered about the axis that connects the boss part and the rim part to each other, and an annular hub pocket centered about the axis,
• the hub pocket includes an annular outer circumferential surface opposed to the boss part on an outer periphery side and provides an annular recess centered about the axis that is recessed in a direction toward the disk part,
• the outer circumferential surface of the hub pocket increases in a diameter toward the disk part along the axis,
• the seal lip of the oil seal directly or indirectly abuts against the boss part in a slidable manner, and
• the protrusion of the annular member extends toward the hub pocket so that an annular gap is formed between the protrusion and the outer circumferential surface of the hub pocket.