| 摘要 |
Sliding parts by which a sealing function of sealing faces can be maintained by changing a ratio between a negative pressure region and a positive pressure region in the radial direction of the sealing faces and decreasing the positive pressure region while ensuring negative pressure generation force are provided. Sliding parts of a pair of annular bodies including sealing faces that relatively slide on each other are characterized in that a reversed Rayleigh step mechanism 10 serving as a negative pressure generation mechanism is provided in at least one of the sealing faces, a negative pressure generation groove 10a that forms the reversed Rayleigh step mechanism 10 is provided in an arc shape along the circumferential direction of the sealing face so as to be isolated from a high pressure fluid side and a low pressure fluid side by a land section R, an upstream side end 10b and a downstream side end 10c of the negative pressure generation groove 10a are isolated from each other by the land section R, the downstream side end 10c communicates with the high pressure fluid side via a deep groove 11, and a ratio x = b/a between circumferential length a of the negative pressure generation groove 10a and circumferential length b of the land section R between the upstream side end of the negative pressure generation groove and the deep groove 11 is set to be different in the radial direction. |
