SEAL STRUCTURE AND SUPERCHARGER PROVIDED WITH SAID SEAL STRUCTURE

摘要

The purpose of the present invention is to provide a seal structure that can suppress abrasion of a seal ring without increasing the number of components and that can suppress occurrence of abrasion powder as much as possible, the seal structure being used to seal a gap between an outer peripheral surface (8a) of a rotating shaft (8) and an inner peripheral surface (6a) of a bearing housing (6), wherein the seal structure is configured from a first seal groove (22A) formed in the outer peripheral surface (8a) of the rotating shaft (8), a second seal groove (22B) positioned nearer to an impeller than is the first seal groove, a first seal ring (26) fitted in the first seal groove, and a second seal ring (28) fitted in the second seal groove. The first seal ring (26) has: a first seal body part (26A) fitted in the first seal groove; and a first seal protruding part (26B) that protrudes from the first seal body part toward the second seal ring (28), and that is in contact with the second seal ring in contact with a bearing-side wall surface (22Ba) of the second seal groove, while the first seal body part is in contact with a bearing-side wall surface (22Aa) of the first seal groove.