| 摘要 |
PROBLEM TO BE SOLVED: To provide a piston ring with excellent sealability by preventing superposing of abutments of a seal ring and a backup ring, and mutual fixation thereof with a simple means. SOLUTION: This piston ring is composed of a seal ring 2 provided with a stepped abutment, and a backup ring 3 in contact with an inner peripheral surface of the seal ring. A projection 2c is formed on the seal ring 2, on its portion other than the abutment, by press-fitting a fitting material 2b into a hole formed in widthwise direction of the ring 2, which fitting material 2b has a diameter larger than that of the hole and not more than the width of the seal ring. An abutment 3a of the backup ring 3 is engaged with the projection 2c.
|
