# US 10,865,828 B2 · Oil-impregnated sintered bearing > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 10,865,828 B2 - Document ID: US10865828B2 - Status: Granted - Kind: B2 - Application number: 16/335,532 - Filed: 2017-10-26 - Published: 2020-01-16 - Granted: 2020-12-15 - Earliest claimed: 2016-10-26 - Assignees: Diamet Corporation - Applicants: Diamet Corporation - Inventors: Yoshiki Tamura; Shinichi Takezoe - Web page: https://patentgrep.com/patent/US10865828B2 ## CPC - F16C 17/02: for radial load only - F16C 33/104: {in a porous body, e.g. oil impregnated sintered sleeve} - B22F 5/10: of articles with cavities or holes, not otherwise provided for in the preceding subgroups - F16C 33/10: Construction relative to lubrication {(lubrication in general F16N)} - F16C 33/12: Structural composition; Use of special materials or surface treatments, e.g. for rust-proofing - F16C 33/121: {Use of special materials} - F16C 33/128: {Porous bearings, e.g. bushes of sintered alloy} - F16C 2220/20: by sintering pulverised material, e.g. powder metallurgy - F16C 2240/30: Angles, e.g. inclinations - F16C 2300/02: General use or purpose, i.e. no use, purpose, special adaptation or modification indicated or a wide variety of uses mentioned - F16C: SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS - B22F: WORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER (making alloys by powder metallurgy C22C); APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER ## Abstract An oil-impregnated sintered bearing in which a Fe—Cu-based sintered body is impregnated with a lubricant and which has a bearing hole that is configured to support a rotary shaft inserted therethrough, in which an inner circumferential surface of the bearing hole includes at least a first region including a central portion in a shaft direction and a second region forming a portion from a first end portion of the first region to a first opening of the bearing hole, and, in a friction surface of the second region, an area of a Fe phase is larger and an area of a Cu phase formed of Cu powder including Cu-based flat raw material powder is smaller than those in a friction surface of the first region. ## Claims ### Claim 1 An oil-impregnated sintered bearing comprising: an Fe—Cu-based sintered body with a bearing hole that is configured to support a rotary shaft inserted therethrough, wherein the Fe—Cu-based sintered body is impregnated with a lubricant, an inner circumferential surface of the bearing hole includes at least a first region including a central portion in a shaft direction and a second region forming a portion from a first end portion of the first region to a first opening of the bearing hole, and in a friction surface of the second region, an area of an Fe phase is larger and an area of a Cu phase formed of Cu powder including Cu-based flat raw material powder is smaller than those in a friction surface of the first region. ### Claim 2 (depends on 1) The oil-impregnated sintered bearing according to claim 1, wherein the area of the Cu phase in the first region relative to an entire friction surface of the first region is 50% or more, and the area of the Cu phase in the second region relative to an entire friction surface of the second region is less than 50%. ### Claim 3 (depends on 1) The oil-impregnated sintered bearing according to claim 1, wherein an area of the Cu phase in a central portion of the friction surface of the second region along the shaft direction is 20% or more and 70% or less of an area of the Cu phase in a central portion of the friction surface of the first region along the shaft direction. ### Claim 4 (depends on 1) The oil-impregnated sintered bearing according to claim 1, wherein the inner circumferential surface of the bearing hole further includes a third region forming a portion from a second end portion of the first region to a second opening of the bearing hole. ### Claim 5 (depends on 1) The oil-impregnated sintered bearing according to claim 1, wherein the bearing hole includes a straight hole portion that is formed in the first region and has a constant diameter and a first diameter expansion portion that is formed in the second region, continues from the straight hole portion, and has a diameter that increases outwards, to form a tapered shape. ### Claim 6 (depends on 5) The oil-impregnated sintered bearing according to claim 5, wherein the inner circumferential surface of the bearing hole further includes a third region forming a portion of a second end portion of the first region to a second opening of the bearing hole, and wherein the bearing hole further includes a second diameter expansion portion that is formed in the third region, continues from the straight hole portion, and has a diameter that increases outwards, to form a tapered shape. ### Claim 7 (depends on 6) The oil-impregnated sintered bearing according to claim 6, wherein a taper angle of the first diameter expansion portion relative to the shaft direction is equal to a taper angle of the second diameter expansion portion relative to the shaft direction. ### Claim 8 (depends on 6) The oil-impregnated sintered bearing according to claim 6, wherein a taper angle of the first diameter expansion portion relative to the shaft direction is different from a taper angle of the second diameter expansion portion relative to the shaft direction.