Sliding component
A sliding component having excellent lubricity and a high recovery rate of a sealed fluid is provided. In a mechanical seal as a sliding component in which a plurality of spiral grooves serving as a plurality of dynamic pressure generation grooves extending from a low pressure side to a high pressure side are formed on a sliding surface of a stationary seal ring serving as any one sliding member in the mechanical seal, the sliding surface is provided with an annular groove serving as a recessed portion extending in a circumferential direction and opened to the low pressure side and the annular groove communicates with the spiral groove.
1. A sliding component comprising a pair of sliding members, one of the sliding members having a sliding surface provided with a plurality of dynamic pressure generation grooves extending from a leakage side to a sealed fluid side,
wherein the sliding surface is provided with a recessed portion extending in a circumferential direction and opened to the leakage side,
wherein the recessed portion communicates with the dynamic pressure generation grooves,
wherein a bottom surface of the recessed portion is formed to be equal in depth to or higher than a bottom surface of each of the dynamic pressure generation grooves at a boundary between the recessed portion and each of the dynamic pressure generation grooves,
wherein the recessed portion has a circumferential width larger than circumferential lengths of the dynamic pressure generation grooves, and
wherein each of the dynamic pressure generation grooves radially overlap with a groove portion of the recessed portion which is protruded in the circumferential direction from each of the dynamic pressure generation grooves.
2. The sliding component according to claim 1 , wherein the recessed portion is formed in an annular shape.
3. The sliding component according to claim 1 , wherein the recessed portion is formed at an inner radial end of the sliding surface.
4. The sliding component according to claim 2 , wherein the recessed portion is formed at an inner radial end of the sliding surface.