Sliding component

1. A sliding component formed in an annular shape and disposed at a relatively rotating position of a rotating machine and sliding relative to other sliding component, the sliding component comprising:

a sliding surface of the sliding component provided with a shallow groove extending in a circumferential direction and generating a negative pressure and a deep groove collecting a sealing target fluid in the shallow groove and deeper than the shallow groove, and

wherein the shallow groove has a terminating end portion in which a cross-sectional area of a flow path thereof becomes narrow toward the deep groove, and

the terminating end portion of the shallow groove becomes gradually shallow toward the deep groove.

2. The sliding component according to claim 1 ,

wherein a bottom surface of the terminating end portion of the shallow groove is curved to be depressed toward the deep groove.

3. The sliding component according to claim 2 ,

wherein the deep groove communicates with a side of the sealing target fluid.

4. The sliding component according to claim 2 ,

wherein the terminal end portion of the shallow groove is continuous to the deep groove in the circumferential direction, and

the shallow groove further has a starting end portion continuous to the deep groove in the circumferential direction.

5. The sliding component according to claim 2 ,

wherein the shallow groove and the deep groove are equiangularly disposed in the circumferential direction of the sliding surface of the sliding component and the shallow groove is formed in a symmetrical shape with respect to a line passing through the deep groove and extending in a radial direction.

6. The sliding component according to claim 1 ,

wherein the deep groove communicates with a side of the sealing target fluid.

7. The sliding component according to claim 6 ,

wherein the terminal end portion of the shallow groove is continuous to the deep groove in the circumferential direction, and

the shallow groove further has a starting end portion continuous to the deep groove in the circumferential direction.

8. The sliding component according to claim 6 ,

wherein the shallow groove and the deep groove are equiangularly disposed in the circumferential direction of the sliding surface of the sliding component and the shallow groove is formed in a symmetrical shape with respect to a line passing through the deep groove and extending in a radial direction.

9. The sliding component according to claim 1 ,

wherein the terminal end portion of the shallow groove is continuous to the deep groove in the circumferential direction, and

the shallow groove further has a starting end portion continuous to the deep groove in the circumferential direction.

10. The sliding component according to claim 1 ,

wherein the shallow groove and the deep groove are equiangularly disposed in the circumferential direction of the sliding surface of the sliding component and the shallow groove is formed in a symmetrical shape with respect to a line passing through the deep groove and extending in a radial direction.

11. A sliding component formed in an annular shape and disposed at a relatively rotating position of a rotating machine and sliding relative to other sliding component, the sliding component comprising:

a sliding surface of the sliding component provided with a shallow groove extending in a circumferential direction and generating a negative pressure and a deep groove collecting a sealing target fluid in the shallow groove and deeper than the shallow groove, and

wherein the shallow groove has a terminating end portion in which a cross-sectional area of a flow path thereof becomes narrow toward the deep groove,

the terminal end portion of the shallow groove is continuous to the deep groove in the circumferential direction, and

the shallow groove further has a starting end portion continuous to the deep groove in the circumferential direction.

12. The sliding component according to claim 11 ,

wherein a bottom surface of the terminating end portion of the shallow groove is curved to be depressed toward the deep groove.

13. The sliding component according to claim 11 ,

wherein the deep groove communicates with a side of the sealing target fluid.

14. A sliding component formed in an annular shape and disposed at a relatively rotating position of a rotating machine and sliding relative to other sliding component, the sliding component comprising:

a sliding surface of the sliding component provided with a shallow groove extending in a circumferential direction and generating a negative pressure and a deep groove collecting a sealing target fluid in the shallow groove and deeper than the shallow groove, and

wherein the shallow groove has a terminating end portion in which a cross-sectional area of a flow path thereof becomes narrow toward the deep groove, and

the terminating end portion of the shallow groove becomes gradually narrow in radial width toward the deep groove.

15. The sliding component according to claim 14 ,

wherein a bottom surface of the terminating end portion of the shallow groove is curved to be depressed toward the deep groove.

16. The sliding component according to claim 14 ,

wherein the deep groove communicates with a side of the sealing target fluid.

17. The sliding component according to claim 14 ,

wherein the terminal end portion of the shallow groove is continuous to the deep groove in the circumferential direction, and

the shallow groove further has a starting end portion continuous to the deep groove in the circumferential direction.

18. The sliding component according to claim 14 ,

wherein the shallow groove and the deep groove are equiangularly disposed in the circumferential direction of the sliding surface of the sliding component and the shallow groove is formed in a symmetrical shape with respect to a line passing through the deep groove and extending in a radial direction.