# US 12,110,924 B2 · Sliding member and method for producing same > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 12,110,924 B2 - Document ID: US12110924B2 - Status: Granted - Kind: B2 - Application number: 17/774,355 - Filed: 2020-07-21 - Published: 2022-12-22 - Granted: 2024-10-08 - Earliest claimed: 2019-12-12 - Assignees: Sumitomo Electric Industries, Ltd. - Applicants: Sumitomo Electric Industries, Ltd. - Inventors: Shinnosuke Nakajima - Web page: https://patentgrep.com/patent/US12110924B2 ## CPC - F16C 33/125: {Details of bearing layers, i.e. the lining} - B32B 15/085: comprising polyolefins - B32B 15/18: comprising iron or steel {(B32B15/011, B32B15/012 and B32B15/013 take precedence)} - B32B 27/16: specially treated, e.g. irradiated - B32B 27/322: {comprising halogenated polyolefins, e.g. PTFE} - C09D 127/18: Homopolymers or copolymers of tetrafluoroethene - F16C 17/02: for radial load only - F16C 33/124: {Details of overlays} - F16C 33/14: Special methods of manufacture; Running-in - F16C 33/205: {with two layers} - F16C 33/208: {Methods of manufacture, e.g. shaping, applying coatings} - B32B 2250/02: 2 layers - B32B 2307/538: Roughness - B32B 2307/732: Dimensional properties - B32B 2307/746: Slipping, anti-blocking, low friction - B32B 2605/08: Cars - F16C 17/00: Sliding-contact bearings for exclusively rotary movement (F16C32/06 takes precedence; adjustable bearings F16C23/00, F16C25/00) - F16C 33/106: {Details of distribution or circulation inside the bearings, e.g. details of the bearing surfaces to affect flow or pressure of the liquid} - F16C 2208/30: Fluoropolymers (F16C2208/58 takes precedence) - F16C 2223/32: by attaching pre-existing layers, e.g. resin sheets or foils by adhesion to a substrate; Laminating - F16C 2360/00: Engines or pumps - F16C: SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS - B32B: LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM - C09D: COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR (cosmetics A61K; processes for applying liquids or other fluent materials to surfaces, in general, B05D; staining wood B27K5/02; glazes or vitreous enamels C03C; natural resins, French polish, drying-oils, driers, turpentine, per se, C09F; polishing compositions other than French polish, ski waxes C09G; adhesives or use of materials as adhesives C09J; materials for sealing or packing joints or covers C09K3/10; materials for stopping leaks C09K3/12; processes for the electrolytic or electrophoretic production of coatings C25D) ## Abstract A sliding member according to an aspect of the present disclosure includes: a sliding member body containing a metal as a main component; and an outer layer laminated directly on a surface of the sliding member body and containing a crosslinked fluorine resin as a main component, and an arithmetic average roughness Ra1 of a surface having a waveform obtained by extracting a frequency component of a region having waviness having a frequency of not lower than 0.1 μm and not higher than 100.0 μm on a surface of the outer layer through fast Fourier transform processing, and performing inverse Fourier transform processing on data of a frequency component of a region having waviness having a frequency of not lower than 0.1 μm and not higher than 10.0 μm out of the extracted frequency component, is not greater than 0.035 μm. ## Claims ### Claim 1 A sliding member comprising: a sliding member body containing a metal as a main component; and an outer layer laminated directly on a surface of the sliding member body and containing a crosslinked fluorine resin as a main component, wherein an arithmetic average roughness Ra1 of a surface having a waveform obtained by extracting a frequency component of a region having waviness having a frequency of not lower than 0.1 μm and not higher than 100.0 μm on a surface of the outer layer through fast Fourier transform processing, and performing inverse Fourier transform processing on data of a frequency component of a region having waviness having a frequency of not lower than 0.1 μm and not higher than 10.0 μm out of the extracted frequency component, is not greater than 0.035 μm. ### Claim 2 (depends on 1) The sliding member according to claim 1, wherein the arithmetic average roughness Ra1 of the surface having the waveform is not greater than 0.025 μm. ### Claim 3 (depends on 1) The sliding member according to claim 1, wherein the outer layer has an average thickness of not less than 0.1 μm and not greater than 70.0 μm. ### Claim 4 (depends on 1) The sliding member according to claim 1, wherein the outer layer is a coating layer or is composed of a film. ### Claim 5 (depends on 1) The sliding member according to claim 1, wherein the sliding member is used in an oil pump. ### Claim 6 A method for producing a sliding member comprising: a step of laminating an outer layer containing a fluorine resin as a main component, directly on a surface of a sliding member body containing a metal as a main component; and a step of irradiating the outer layer with ionizing radiation, wherein an arithmetic average roughness Ra1 of a surface having a waveform obtained by extracting a frequency component of a region having waviness having a frequency of not lower than 0.1 μm and not higher than 100.0 μm on a surface of the outer layer through fast Fourier transform processing, and performing inverse Fourier transform processing on data of a frequency component of a region having waviness having a frequency of not lower than 0.1 μm and not higher than 10.0 μm out of the extracted frequency component, is not greater than 0.035 μm. ### Claim 7 (depends on 6) The method for producing a sliding member according to claim 6, wherein the laminating step is performed by electrostatic coating using a paint containing a fluorine resin as a main component, by dip coating using a paint containing a fluorine resin as a main component, or by thermocompression bonding of a film containing a fluorine resin as a main component to the sliding member body.