# US 12,000,337 B2 · Bush > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 12,000,337 B2 - Document ID: US12000337B2 - Status: Granted - Kind: B2 - Application number: 17/614,274 - Filed: 2019-05-24 - Published: 2022-07-14 - Granted: 2024-06-04 - Earliest claimed: 2019-05-24 - Assignees: Cummins Inc. - Applicants: Cummins Ltd. - Inventors: Thomas Daniel Morton - Web page: https://patentgrep.com/patent/US12000337B2 ## CPC - F02C 6/12: Turbochargers, i.e. plants for augmenting mechanical power output of internal-combustion piston engines by increase of charge pressure - F02B 37/186: {Arrangements of actuators or linkage for bypass valves} - F02C 7/06: Arrangements of bearings (bearings F16C); Lubricating ({of turbo machines F01D25/18; of machines or} engines in general F01M) - F01D 17/105: {by passing part of the fluid} - F05D 2220/40: in turbochargers - F05D 2240/54: Radial bearings - F05D 2260/57: using servos, independent actuators, etc. - F02C: GAS-TURBINE PLANTS; AIR INTAKES FOR JET-PROPULSION PLANTS; CONTROLLING FUEL SUPPLY IN AIR-BREATHING JET-PROPULSION PLANTS (construction of turbines F01D; jet-propulsion plants F02K; construction of compressors or fans F04; generating combustion products of high pressure or high velocity F23R; using gas turbines in compression refrigeration plants F25B11/00) - F02B: INTERNAL-COMBUSTION PISTON ENGINES; COMBUSTION ENGINES IN GENERAL (gas-turbine plants F02C; hot-gas or combustion-product positive-displacement engine plants F02G) - F01D: NON-POSITIVE DISPLACEMENT MACHINES OR ENGINES, e.g. STEAM TURBINES (machines or engines for liquids F03; non-positive displacement pumps F04D) - F05D: INDEXING SCHEME FOR ASPECTS RELATING TO NON-POSITIVE-DISPLACEMENT MACHINES OR ENGINES, GAS-TURBINES OR JET-PROPULSION PLANTS ## Abstract There is disclosed a bush comprising an internal surface and an external surface. The internal surface defines a bore and is configured to support movement of a body received in the bore. The external surface defines an outer radius. The external surface comprises one or more recesses. ## Claims ### Claim 1 An assembly comprising: a bush housing comprising a bush-receiving bore; and a bush received in the bush-receiving bore, the bush comprising an internal surface and an external surface; wherein the internal surface defines a bore and is configured to support movement of a body received in the bore; wherein the external surface defines an outer radius; wherein the external surface comprises one or more recesses disposed axially within the bush-receiving bore; and wherein the bush housing is plastically deformed in the locality of the one or more recesses and the plastically deformed material thereby engages the one or more recesses to retain the bush in the bush-receiving bore. ### Claim 2 (depends on 1) The assembly according to claim 1, wherein the one or more recesses comprise one or more of an annular recess, an axial recess, a helical recess, knurling or other indented geometry. ### Claim 3 (depends on 2) The assembly according to claim 2, wherein the one or more recesses is a plurality of annular recesses. ### Claim 4 (depends on 1) The assembly according to claim 1, wherein the one or more recesses span an entire axial extent of the external surface. ### Claim 5 (depends on 1) The assembly according to claim 1, wherein the one or more recesses are recessed to a radial depth of at least around 0.04 mm relative to the outer radius. ### Claim 6 (depends on 1) The assembly according to claim 1, wherein an entire axial extent of the bush is between around 15 mm and around 100 mm. ### Claim 7 (depends on 1) The assembly according to claim 1, wherein the outer radius is between around 5 mm and around 10 mm. ### Claim 8 (depends on 1) A turbine housing assembly comprising a turbine housing and the assembly of claim 1, wherein the turbine housing comprises the bush housing. ### Claim 9 (depends on 1) A bearing assembly comprising the assembly according to claim 1 and a rotatable body received in the bore. ### Claim 10 (depends on 8) A turbine housing assembly according to claim 8, further comprising a rotatable body received in the bore, wherein the rotatable body is a shaft which forms part of a wastegate. ### Claim 11 (depends on 9) A turbocharger comprising: a compressor comprising a compressor housing and a compressor impeller; a turbine comprising a turbine wheel and the turbine housing assembly of claim 9; and a shaft connected to both the compressor impeller and the turbine wheel, such that rotation of the turbine wheel is configured to drive rotation of the compressor impeller. ### Claim 12 (depends on 1) A valve assembly comprising the assembly of claim 1. ### Claim 13 A method of inserting a bush into a bush housing, the method comprising the steps of: i) aligning the bush with a bush-receiving bore of the bush housing; ii) urging the bush into the bush-receiving bore such that one or more recesses in an external surface of the bush are disposed within the bush-receiving bore; and iii) applying a compressive force to compress the bush housing such that the bush housing is plastically deformed in the locality of the one or more recesses and the plastically deformed material thereby engages the one or more recesses. ### Claim 14 (depends on 13) The method according to claim 13, wherein the application of force to compress the bush housing is in a substantially axial direction. ### Claim 15 (depends on 14) The method according to claim 14, wherein the force is applied to an external surface of the bush housing. ### Claim 16 (depends on 13) The method according to claim 13, wherein the application of force to compress the bush housing is in a substantially radial direction. ### Claim 17 (depends on 13) The method according to claim 13, wherein the force is applied by a staking process. ### Claim 18 An assembly comprising a bush received in a bush-receiving bore of a bush housing, the assembly being obtained by the method of: i) aligning the bush with the bush-receiving bore; ii) urging the bush into the bush-receiving bore such that one or more recesses in an external surface of the bush are disposed within the bush-receiving bore; and iii) applying a compressive force to compress the bush housing such that the bush housing is plastically deformed in the locality of the one or more recesses and the plastically deformed material thereby engages the one or more recesses; wherein the bush housing comprises one or more indentations in an external surface of the bush housing, the one or more indentations being formed during step (iii). ### Claim 19 (depends on 1) The assembly according to claim 1, wherein the bush housing comprises one or more indentations in an external surface of the bush housing. ### Claim 20 (depends on 13) The method according to claim 13, wherein the bush housing comprises one or more indentations in an external surface of the bush housing, the one or more indentations being formed during step (iii).