IP Library › Granted Patent US 12687195
Granted Patent B2
US 12687195 · App. 18/685,161 · Granted Jul 21, 2026

Sliding parts

Inventor: Tadatsugu Imura (Tokyo, JP)
Assignee: EAGLE INDUSTRY CO., LTD.
F16C17/026
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Quick Facts
Patent No.
US 12687195
App. No.
18/685,161
Granted
Jul 21, 2026
Kind
B2
Abstract

In sliding parts which is disposed at a relative rotational location of a rotating machine, and in which a first dynamic pressure generation groove extending so as to be inclined with respect to a relative rotation direction and a second dynamic pressure generation groove extending so as to be inclined in a direction opposite to the inclination direction of the first dynamic pressure generation groove with respect to the relative rotation direction in a plan view are provided on a sliding surface, bottom surfaces of the first dynamic pressure generation groove and the second dynamic pressure generation groove are inclined in the same direction with respect to a radial direction in a cross-sectional view.

Claims (42)

1 . Sliding parts which are formed in an annular shape and disposed at a relative rotational location of a rotating machine, comprising a first sliding component having a first sliding surface and a second sliding component having a second sliding surface relatively slidable with the first sliding surface, the first sliding surface or the second sliding surface being provided with a first dynamic pressure generation groove extending so as to be inclined with respect to a relative rotation direction in a plan view, the first sliding surface or the second sliding surface being provided with a second dynamic pressure generation groove extending so as to be inclined in a direction opposite to an inclination direction of the first dynamic pressure generation groove with respect to the relative rotation direction in the plan view,

wherein one of an outer diameter side and an inner diameter side of the sliding parts is a first radial side, and remaining one of the outer diameter side and the inner diameter side of the sliding parts is a second radial side,

wherein the first dynamic pressure generation groove has a bottom surface which becomes shallower from the first radial side toward the second radial side throughout all the bottom surface of the first dynamic pressure generation groove,

wherein the second dynamic pressure generation groove has a bottom surface which becomes shallower from the first radial side toward the second radial side throughout all the bottom surface of the second dynamic pressure generation groove,

wherein the first dynamic pressure generation groove and the second dynamic pressure generation groove are disposed to be shifted from each other in a radial direction,

wherein the first dynamic pressure generation groove has a deep groove portion on an upstream side of the relative rotation direction and a shallow groove portion on a downstream side of the relative rotation direction, and

wherein the second dynamic pressure generation groove has a shallow groove portion on the upstream side of the relative rotation direction and a deep groove portion on the downstream side of the relative rotation direction.

2 . The sliding parts according to claim 1 ,

wherein an end portion on the first radial side of the first dynamic pressure generation groove is configured to communicate with the first radial side as a sealed fluid side space or a leakage side space.

3 . The sliding parts according to claim 2 ,

wherein the second dynamic pressure generation groove is a closed groove, and a length of the second dynamic pressure generation groove in an inclination direction of the second dynamic pressure generation groove is longer than a length of the first dynamic pressure generation groove in an inclination direction of the first dynamic pressure generation groove.

4 . The sliding parts according to claim 1 ,

wherein the first dynamic pressure generation groove and the second dynamic pressure generation groove are configured to communicate with each other.

5 . The sliding parts according to claim 1 ,

wherein the first dynamic pressure generation groove and the second dynamic pressure generation groove are disposed side by side in the radial direction.

6 . The sliding parts according to claim 1 ,

wherein both the first dynamic pressure generation groove and the second dynamic pressure generation groove are provided on one of the first sliding surface and the second sliding surface.

7 . The sliding parts according to claim 2 ,

wherein the first dynamic pressure generation groove and the second dynamic pressure generation groove are configured to communicate with each other.

8 . The sliding parts according to claim 2 ,

wherein the first dynamic pressure generation groove and the second dynamic pressure generation groove are disposed side by side in the radial direction.

9 . The sliding parts according to claim 3 ,

wherein the first dynamic pressure generation groove and the second dynamic pressure generation groove are configured to communicate with each other.

10 . The sliding parts according to claim 3 ,

wherein the first dynamic pressure generation groove and the second dynamic pressure generation groove are disposed side by side in the radial direction.

11 . Sliding parts which are formed in an annular shape and disposed at a relative rotational location of a rotating machine, comprising a first sliding component having a first sliding surface and a second sliding component having a second sliding surface relatively slidable with the first sliding surface, the first sliding surface or the second sliding surface being provided with a first dynamic pressure generation groove extending so as to be inclined with respect to a relative rotation direction in a plan view, the first sliding surface or the second sliding surface being provided with a second dynamic pressure generation groove extending so as to be inclined in a direction opposite to an inclination direction of the first dynamic pressure generation groove with respect to the relative rotation direction in the plan view,

wherein one of an outer diameter side and an inner diameter side of the sliding parts is a first radial side, and remaining one of the outer diameter side and the inner diameter side of the sliding parts is a second radial side,

wherein the first dynamic pressure generation groove has a bottom surface which becomes shallower from the first radial side toward the second radial side throughout all the bottom surface of the first dynamic pressure generation groove,

wherein the second dynamic pressure generation groove has a bottom surface which becomes shallower from the first radial side toward the second radial side throughout all the bottom surface of the second dynamic pressure generation groove,

wherein the first dynamic pressure generation groove and the second dynamic pressure generation groove are disposed to be shifted from each other in a radial direction,

wherein the first dynamic pressure generation groove has a shallow groove portion on an upstream side of the relative rotation direction and a deep groove portion on a downstream side of the relative rotation direction, and

wherein the second dynamic pressure generation groove has a deep groove portion on the upstream side of the relative rotation direction and a shallow groove portion on the downstream side of the relative rotation direction.

12 . The sliding parts according to claim 11 ,

wherein an end portion on the first radial side of the first dynamic pressure generation groove is configured to communicate with the first radial side as a sealed fluid side space or a leakage side space.

13 . The sliding parts according to claim 12 ,

wherein the second dynamic pressure generation groove is a closed groove, and a length of the second dynamic pressure generation groove in an inclination direction of the second dynamic pressure generation groove is longer than a length of the first dynamic pressure generation groove in an inclination direction of the first dynamic pressure generation groove.

14 . The sliding parts according to claim 11 ,

wherein the first dynamic pressure generation groove and the second dynamic pressure generation groove are configured to communicate with each other.

15 . The sliding parts according to claim 11 ,

wherein the first dynamic pressure generation groove and the second dynamic pressure generation groove are disposed side by side in the radial direction.

16 . The sliding parts according to claim 11 ,

wherein both the first dynamic pressure generation groove and the second dynamic pressure generation groove are provided on one of the first sliding surface and the second sliding surface.