# US 12,007,027 B2 · Sliding component > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 12,007,027 B2 - Document ID: US12007027B2 - Status: Granted - Kind: B2 - Application number: 17/603,561 - Filed: 2020-04-21 - Published: 2022-06-23 - Granted: 2024-06-11 - Earliest claimed: 2019-04-24 - Assignees: Eagle Industry Co., Ltd. - Applicants: Eagle Industry Co., Ltd. - Inventors: Tadatsugu Imura - Web page: https://patentgrep.com/patent/US12007027B2 ## CPC - F16J 15/164: {the sealing action depending on movements; pressure difference, temperature or presence of leaking fluid} - F16J 15/3412: {with cavities (F16J15/3424 takes precedence)} - F16C 33/74: of sliding-contact bearings - F16J 15/3416: {with at least one continuous groove} - F16J 15/3464: {Mounting of the seal} - F16J: PISTONS {(specially adapted for dampers F16F9/32)}; CYLINDERS; SEALINGS - F16C: SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS ## Abstract Provided is a sliding component capable of exhibiting stable sliding performance under various conditions. The sliding component includes a first ring and a second ring which are provided with facing surfaces facing each other and relatively rotated upon a drive of a rotating machine. At least the first ring is provided with a curved surface portion formed in a convex shape and forming at least a part of the facing surface of the first ring. ## Claims ### Claim 1 A sliding component comprising a first ring and a second ring which are provided with facing surfaces facing each other and relatively rotated upon a drive of a rotating machine, wherein at least the first ring is provided with a curved surface portion formed in a convex shape and constituting at least a part of the facing surface of the first ring, and the curved surface portion is constituted by a plurality of minute step portions radially formed along a circumferential direction of the facing surface of the first ring. ### Claim 2 (depends on 1) The sliding component according to claim 1, wherein the curved surface portion is formed over a circumferential direction of the facing surface of the first ring. ### Claim 3 (depends on 2) The sliding component according to claim 2, wherein the curved surface portion is formed at one or both of an outer diameter end and an inner diameter end of the first ring. ### Claim 4 (depends on 1) The sliding component according to claim 1, wherein the second ring is provided with a curved surface portion formed in a concave shape and constituting at least a part of the facing surface of the second ring, and the curved surface portion of the first ring is smaller in radius of curvature than the curved surface portion of the second ring. ### Claim 5 (depends on 1) The sliding component according to claim 1, wherein the first ring provided with the curved surface portion is disposed on a stationary side of the rotating machine. ### Claim 6 (depends on 1) The sliding component according to claim 1, wherein a functional groove is formed in one or both of the curved surface portion of the first ring and the facing surface of the second ring facing the curved surface portion of the first ring, the functional groove is opened at an outer diameter side or an inner diameter side of the sliding component. ### Claim 7 (depends on 6) The sliding component according to claim 6, wherein in the first ring provided with the functional groove, at least another functional groove is formed, the functional grooves have depths equal to each other and each has a bottom surface parallel to a surface shape of the curved surface portion, and the functional grooves overlap with each other in a radially directional view. ### Claim 8 (depends on 2) The sliding component according to claim 2, wherein the second ring is provided with a curved surface portion formed in a concave shape and constituting at least a part of the facing surface of the second ring, and the curved surface portion of the first ring is smaller in radius of curvature than the curved surface portion of the second ring. ### Claim 9 (depends on 2) The sliding component according to claim 2, wherein the first ring provided with the curved surface portion is disposed on a stationary side of the rotating machine. ### Claim 10 (depends on 2) The sliding component according to claim 2, wherein a functional groove is formed in one or both of the curved surface portion of the first ring and the facing surface of the second ring facing the curved surface portion of the first ring, the functional groove is opened at an outer diameter side or an inner diameter side of the sliding component. ### Claim 11 (depends on 10) The sliding component according to claim 10, wherein in the first ring provided with the functional groove, at least another functional groove is formed, the functional grooves have depths equal to each other and each has a bottom surface parallel to a surface shape of the curved surface portion, and the functional grooves overlap with each other in a radially directional view. ### Claim 12 (depends on 3) The sliding component according to claim 3, wherein the second ring is provided with a curved surface portion formed in a concave shape and constituting at least a part of the facing surface of the second ring, and the curved surface portion of the first ring is smaller in radius of curvature than the curved surface portion of the second ring. ### Claim 13 (depends on 3) The sliding component according to claim 3, wherein the first ring provided with the curved surface portion is disposed on a stationary side of the rotating machine. ### Claim 14 (depends on 3) The sliding component according to claim 3, wherein a functional groove is formed in one or both of the curved surface portion of the first ring and the facing surface of the second ring facing the curved surface portion of the first ring, the functional groove is opened at an outer diameter side or an inner diameter side of the sliding component. ### Claim 15 (depends on 14) The sliding component according to claim 14, wherein in the first ring provided with the functional groove, at least another functional groove is formed, the functional grooves have depths equal to each other and each has a bottom surface parallel to a surface shape of the curved surface portion, and the functional grooves overlap with each other in a radially directional view. ### Claim 16 (depends on 4) The sliding component according to claim 4, wherein the first ring provided with the curved surface portion is disposed on a stationary side of the rotating machine. ### Claim 17 (depends on 4) The sliding component according to claim 4, wherein a functional groove is formed in one or both of the curved surface portion of the first ring and the facing surface of the second ring facing the curved surface portion of the first ring, the functional groove is opened at an outer diameter side or an inner diameter side of the sliding component.