# US 2021/0277936 A1 · Sliding bearing, method for producing a sliding bearing, internal combustion engine having a sliding bearing and electric machine having a sliding bearing > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 2021/0277936 A1 - Document ID: US20210277936A1 - Status: Published application - Kind: A1 - Application number: 17/191,680 - Filed: 2021-03-03 - Published: 2021-09-09 - Earliest claimed: 2020-03-04 - Assignees: Mahle International GmbH - Applicants: Mahle International GmbH - Inventors: Armin Geis; Andreas Gutmann; Lilia Kurmanaeva; Alexander Puck; Patrick Sutter; Klaus Wintrich - Web page: https://patentgrep.com/patent/US20210277936A1 ## CPC - F16C 17/02: for radial load only - B22F 3/26: Impregnating {(making ferrous alloys by impregnation C22C33/0242)} - C22C 19/058: {without Mo and W} - C22C 33/0214: {comprising P or a phosphorus compound} - C22C 33/0242: {using the impregnating technique} - C22C 38/008: {containing tin} - C22C 38/16: containing copper - F16C 3/02: Shafts; Axles - F16C 33/104: {in a porous body, e.g. oil impregnated sintered sleeve} - F16C 33/128: {Porous bearings, e.g. bushes of sintered alloy} - F16C 33/145: {of sintered porous bearings} - F16C 2202/10: Porosity - F16C 2204/66: High carbon steel, i.e. carbon content above 0.8 wt%, e.g. through-hardenable steel - F16C 2204/72: with nickel as further constituent, e.g. stainless steel - F16C 2220/20: by sintering pulverised material, e.g. powder metallurgy - F16C 2360/22: Internal combustion engines - F16C 2380/26: Dynamo-electric machines or combinations therewith, e.g. electro-motors and generators - 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 - C22C: ALLOYS (treatment of alloys C21D, C22F) ## Abstract A sliding bearing may include an uncoated shaft and a bearing bush. The uncoated shaft may include a shaft material. The bearing bush may include a sintered bearing bush material. The shaft may be slidingly and moveably guided, relative to the bearing bush, within the bearing bush. The bearing bush material may have a residual porosity of 8 percent or more. A volume of the residual porosity may be filled with an oil up to 80 percent or more. ## Claims ### Claim 1 A sliding bearing, comprising: an uncoated shaft including a shaft material; a bearing bush including a sintered bearing bush material, the shaft slidingly and moveably guided, relative to the bearing bush, within the bearing bush; wherein the bearing bush material has a residual porosity of 8 percent or more; and wherein a volume of the residual porosity is filled with an oil up to 80 percent or more. ### Claim 2 (depends on 1) The sliding bearing according to claim 1, wherein the volume of the residual porosity is filled up to 90 percent or more with the oil. ### Claim 3 (depends on 1) The sliding bearing according to claim 1, wherein the bearing bush material has a composition including: 1.8 to 2.2 percent by weight of carbon; 0.2 to 0.5 percent by weight of phosphorus; 3.5 to 5 percent by weight of copper; 0.4 to 0.6 percent by weight of tin; and a residual component. ### Claim 4 (depends on 1) The sliding bearing according to claim 1, wherein the bearing bush material has a composition including: 0.8 to 1.3 percent by weight of carbon; 0.2 to 0.4 percent by weight of sulphur; 1.3 to 2.5 percent by weight of nickel; 0.8 to 1.2 percent by weight of molybdenum; 0 to 0.5 percent by weight of manganese; and a residual component. ### Claim 5 (depends on 1) The sliding bearing according to claim 1, wherein the sintered bearing bush material has a density of 6.2 to 6.8 g/cm3. ### Claim 6 (depends on 1) The sliding bearing according to claim 1, wherein the shaft material has a composition including: 0.4 to 0.5 percent by weight of carbon; 2.7 to 3.3 percent by weight of silicon; 0 to 0.6 percent by weight of manganese; 8 to 10 percent by weight of chromium; 0 to 0.5 percent by weight of nickel; 0 to 0.04 percent by weight of phosphorus; 0 to 0.03 percent by weight of sulphur; and a residual component. ### Claim 7 (depends on 1) The sliding bearing according to claim 1, wherein the shaft material has a composition including: 0.45 to 0.55 percent by weight of carbon; 0 to 0.45 percent by weight of silicon; 8 to 10 percent by weight of manganese; 20 to 22 percent by weight of chromium; 3.5 to 5.5 percent by weight of nickel; 0 to 0.04 percent by weight of phosphorus; 0 to 0.03 percent by weight of sulphur; 0.4 to 0.6 percent by weight of nitrogen; 1.8 to 2.5 percent by weight of niobium; 0.8 to 1.5 percent by weight of tungsten; and a residual component. ### Claim 8 (depends on 1) The sliding bearing according to claim 1, wherein the shaft material has a composition including: 0 to 0.08 percent by weight of carbon; 0 to 0.5 percent by weight of silicon; 0 to 0.5 percent by weight of manganese; 13.5 to 15.5 percent by weight of chromium; 30 to 33.5 percent per by weight of nickel; 0 to 0.015 percent by weight of phosphorus; 0 to 0.01 percent by weight of sulphur; 1.6 to 2.2 percent by weight of aluminium; 0.4 to 0.9 percent by weight of niobium; 2.3 to 2.9 percent by weight of titanium; 0.4 to 1.0 percent by weight of molybdenum; and a residual component. ### Claim 9 (depends on 1) The sliding bearing according to claim 1, wherein the shaft material has a composition including: 0.25 to 0.35 percent by weight of carbon; 0 to 0.3 percent by weight of silicon; 4 to 6 percent by weight of manganese; 24 to 26 percent by weight of chromium; 10 to 13 percent by weight of nickel; 0 to 0.2 percent by weight of phosphorus; 0 to 0.2 percent by weight of sulphur; 0 to 0.5 percent by weight of aluminium; 0 to 0.5 percent by weight of copper; 1.8 to 2.5 percent by weight of niobium; 0.5 to 0.7 percent by weight of nitrogen; and a residual component. ### Claim 10 (depends on 3) The sliding bearing according to claim 3, wherein the residual component includes 26.315 percent by weight to 96.9 percent by weight of iron. ### Claim 11 (depends on 3) The sliding bearing according to claim 3, wherein the residual component includes iron and contaminations. ### Claim 12 (depends on 3) The sliding bearing according to claim 3, wherein a remaining weight content of the residual component is formed by iron. ### Claim 13 (depends on 1) The sliding bearing according to claim 1, wherein the shaft material has a composition including: 0 to 0.13 percent by weight of carbon; 0 to 1 percent by weight of silicon; 0 to 1 percent by weight of manganese; 18 to 21 percent by weight of chromium; 15 to 21 percent by weight of cobalt; 0 to 0.015 percent by weight of phosphorus; 0 to 0.02 percent by weight of sulphur; 1 to 2 percent by weight of aluminium; 0 to 0.2 percent by weight of copper; 2 to 3 percent by weight of titanium; 0 to 0.15 percent by weight of zirconium; 0 to 0.02 percent by weight of boron; 0 to 1.5 percent by weight of iron; and a residual component. ### Claim 14 (depends on 13) The sliding bearing according to claim 13, wherein the residual component includes 48.965 percent by weight to 64 percent by weight of nickel. ### Claim 15 (depends on 13) The sliding bearing according to claim 13, wherein the residual component includes nickel and contaminations. ### Claim 16 (depends on 13) The sliding bearing according to claim 13, wherein a remaining weight content of the residual component is formed by nickel. ### Claim 17 (depends on 1) The sliding bearing according to claim 1, wherein the residual component includes 0.2 percent by weight or less of contaminations. ### Claim 18 (depends on 1) The sliding bearing according to claim 1, wherein the shaft material is a case-hardened steel. ### Claim 19 A method for producing a sliding bearing, comprising: providing a bearing bush including a sintered bearing bush material having a residual porosity of at least 8 percent; providing an uncoated shaft including a shaft material, the shaft slidingly and moveably guidable within the bearing bush; and filling 80 percent or more of a volume of the residual porosity of the sintered bearing bush material with an oil via introducing the oil into the residual porosity in an impregnating operation at a pressure of 1 mbar to 850 mbar and at an oil temperature of 42° Celsius to 97° Celsius. ### Claim 20 (depends on 1) An internal combustion engine, comprising: at least one gas exchange valve including a valve stem; the sliding bearing according to claim 1; and wherein the shaft of the sliding bearing includes the valve stem. ### Claim 21 An electric machine, comprising: a sliding bearing including an uncoated shaft and a bearing bush, the uncoated shaft including a shaft material, the bearing bush including a sintered bearing bush material having a residual porosity of 8 percent or more; a stator; a rotor rotatably mounted on the stator and rotatable relative to the stator via the sliding bearing; wherein the shaft is slidingly and moveably guided, relative to the bearing bush, within the bearing bush; and wherein a volume of the residual porosity is filled with an oil up to 80 percent or more.