Patent ID: 7347214

Claim:
A rotary shaft sealing mechanism comprising: a rotary shaft for rotating a body-to-be-rotated; an outer cylindrical member disposed around the rotary shaft in an arrangement which does not hinder the rotation of the rotary shaft; and a sealing ring of a resin held by the outer cylindrical member in an arrangement which permits the rotary shaft to be passed through the sealing ring, wherein a clearance between the rotary shaft and the sealing ring being adjusted by press inserting the rotary shaft into the sealing ring and rotating the rotary shaft to abrade the sealing ring, and wherein the sealing ring is constituted with a first O-ring and a second O-ring contacting each other and of different resins which have different thermal expansion coefficients; the thermal expansion coefficient of the first O-ring is larger than that of the second O-ring; an inner diameter of the second O-ring is smaller than that of the first O-ring; and the inner diameter of the second O-ring is adjusted by said abrasion.