Sliding component
An annular sliding component is one of two sliding rings that rotate relative to each other and partition a sealed fluid space and a leakage space, the sliding component includes a dynamic pressure generating groove that generates a dynamic pressure, and includes an inclined groove which extends from the leakage space toward the sealed fluid space with an inclination in a forward rotation direction and has a first dynamic pressure generating end portion and a reverse groove which extends from a backward rotation direction side of the inclined groove in a backward rotation direction and has a second dynamic pressure generating end portion.
1 . A sliding component which is one of two sliding rings that rotate relative to each other and partition a sealed fluid space and a leakage space,
wherein the sliding component includes a plurality of dynamic pressure generating grooves each configured to generate a dynamic pressure, the dynamic pressure generating groove includes a plurality of inclined grooves and a plurality of reverse grooves,
each of the inclined grooves extends from the leakage space toward the sealed fluid space with an inclination in a forward rotation direction which is a relative rotation direction of a remaining one of the two sliding rings, and has a first dynamic pressure generating end portion,
each of the reverse grooves extends from a backward rotation direction side of each of the inclined grooves in a backward rotation direction which is a relative rotation direction of the remaining one of the two sliding rings, and has a second dynamic pressure generating end portion, and
sealed-fluid-space-side wall portions of the inclined grooves on a side of the sealed fluid space extend on a circumferential line.
2 . The sliding component according to claim 1 ,
wherein the second dynamic pressure generating end portion extends from a closed end portion of the inclined groove, and
the first dynamic pressure generating end portion and the second dynamic pressure generating end portion are aligned in a circumferential line.
3 . The sliding component according to claim 2 ,
wherein wall surfaces of the first dynamic pressure generating end portion and the second dynamic pressure generating end portion on a side of the sealed fluid space are continuous to collectively form a smoothly continuous surface.
4 . The sliding component according to claim 1 ,
wherein the first dynamic pressure generating end portion is disposed on a side of the leakage space in relation to the second dynamic pressure generating end portion.
5 . The sliding component according to claim 4 ,
wherein wall surfaces of the first dynamic pressure generating end portion and the second dynamic pressure generating end portion on a side of the sealed fluid space are continuous to collectively form a smoothly continuous surface.
6 . The sliding component according to claim 1 ,
wherein wall surfaces of the first dynamic pressure generating end portion and the second dynamic pressure generating end portion on a side of the sealed fluid space are continuous to collectively form a smoothly continuous surface.
7 . The sliding component according to claim 1 ,
wherein wall surfaces of the first dynamic pressure generating end portion and the second dynamic pressure generating end portion on a side of the sealed fluid space are continuous to collectively form an arc-shaped surface.
8 . The sliding component according to claim 1 ,
wherein the first dynamic pressure generating end portion is defined by lines crossing each other at an acute angle when viewed from an axial direction.
9 . The sliding component according to claim 1 ,
wherein the first dynamic pressure generating end portion is tapered in the forward rotation direction and has a curved tip.
10 . The sliding component according to claim 1 ,
wherein the second dynamic pressure generating end portion is defined by lines crossing each other at an acute angle when viewed from an axial direction.
11 . The sliding component according to claim 1 ,
wherein the second dynamic pressure generating end portion is tapered in the backward rotation direction and has a curved tip.
12 . The sliding component according to claim 1 , further comprising:
a fluid input/output groove which communicates with the sealed fluid space.
13 . The sliding component according to claim 12 ,
wherein the fluid input/output groove includes a dynamic pressure generating portion.
14 . A sliding component which is one of two sliding rings that rotate relative to each other and partition a sealed fluid space and a leakage space,
wherein the sliding component includes a plurality of dynamic pressure generating grooves each configured to generate a dynamic pressure, the dynamic pressure generating groove includes a plurality of inclined grooves and a plurality of reverse grooves,
each of the inclined grooves extends from the leakage space toward the sealed fluid space with an inclination in a forward rotation direction which is a relative rotation direction of a remaining one of the two sliding rings, and has a first dynamic pressure generating end portion,
each of the reverse grooves extends from a backward rotation direction side of each of the inclined grooves in a backward rotation direction which is a relative rotation direction of the remaining one of the two sliding rings, and has a second dynamic pressure generating end portion, and
the first dynamic pressure generating end portion is disposed on a side of the sealed fluid space in relation to the second dynamic pressure generating end portion.
15 . The sliding component according to claim 14 ,
wherein wall surfaces of the first dynamic pressure generating end portion and the second dynamic pressure generating end portion on a side of the sealed fluid space are continuous to collectively form a smoothly continuous surface.