| 摘要 |
Provided is a sliding component with which the sealing function of a sliding surface is maintained by changing the ratio of a low-pressure region and a high-pressure region in the radial direction of the sliding surface and reducing the positive pressure region while ensuring positive pressure generating force. The present invention is characterized in that: a reverse Rayleigh step mechanism (10), which is a negative pressure generation mechanism, is provided on at least one of the sliding surfaces of sliding components comprising annular bodies and sliding relative to one another; a negative pressure generation groove (10a) forming the reverse Rayleigh step mechanism (10) is provided in an arc shape along the circumferential direction of the sliding surface so as to separate a high-pressure-fluid side and a low-pressure-fluid side by means of a land section (R); the upstream end part (10b) and the downstream end part (10c) of the negative pressure generation groove (10a) are separated by means of the land section (R), and the downstream end (10c) communicates with the high-pressure-fluid side via a deep groove (11); and the ratio (x=b/a) of the circumferential length (a) of the negative pressure generation groove (10a) and the circumferential length (b) of the land section (R) between the upstream end part of the negative pressure generation groove and the deep groove (11) is set so as to differ in the radial direction. |
