Seal ring and sealing device

A sealing device, comprising:

• a housing having a shaft hole;
• a shaft member, which is arranged in the shaft hole and is configured to rotate relative to the housing;
• and
• a seal ring, which is mounted in an annular groove formed in an outer peripheral surface of the shaft member and is configured to seal an annular gap formed between the shaft member and the housing,
• wherein, when a fluid is pressure-fed into the annular groove, one side of a center axis of the shaft member becomes a high-pressure side and another side of the center axis of the shaft member becomes a low-pressure side,
• wherein the seal ring comprises a high-pressure side projecting portion formed on a side surface of the seal ring on the high-pressure side,
• wherein a distal end portion of the high-pressure side projecting portion projects most toward the high-pressure side as compared to an entire side surface on the high-pressure side except for the distal end portion, and
• wherein a sectional shape of a cross section of the seal ring, which is orthogonal to a circumferential direction of the seal ring, is asymmetric with respect to a radial center line that divides the sectional shape into two sides corresponding to one side and another side of a center axis of the seal ring,
• wherein a width of an inner peripheral surface of the seal ring in a direction parallel to the center axis is smaller than a width of an outer peripheral surface of the seal ring, and
• wherein the high-pressure side projecting portion is formed on the side surface on the high-pressure side, and is an only projecting portion formed on either of a side surface on the low-pressure side or the side surface on the high-pressure side of the seal ring.