# US 10,371,007 B2 · Auxiliary oil pump for gas turbine engine gear reduction > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 10,371,007 B2 - Document ID: US10371007B2 - Status: Granted - Kind: B2 - Application number: 15/027,264 - Filed: 2014-10-16 - Published: 2016-09-08 - Granted: 2019-08-06 - Earliest claimed: 2013-11-01 - Assignees: United Technologies Corporation - Applicants: United Technologies Corporation - Inventors: Brian P. Cigal; Christopher M. Valva - Web page: https://patentgrep.com/patent/US10371007B2 ## CPC - F01D 25/20: using lubrication pumps - F01D 21/00: Shutting-down of machines or engines, e.g. in emergency; Regulating, controlling, or safety means not otherwise provided for - F01D 25/166: {Sliding contact bearing (gas bearings F01D25/22)} - F02C 7/06: Arrangements of bearings (bearings F16C); Lubricating ({of turbo machines F01D25/18; of machines or} engines in general F01M) - F02C 7/36: Power transmission arrangements between the different shafts of the gas turbine plant, or between the gas-turbine plant and the power user ({F02C3/107 - F02C3/13 and} F02C7/32 take precedence; couplings for transmitting rotation F16D; gearing in general F16H) - F16H 57/04: Features relating to lubrication or cooling {or heating} (control of lubrication or cooling in hydrostatic gearing F16H61/4165) - F16H 57/0439: {using multiple pumps with different power sources or a single pump with different power sources, e.g. one and the same pump may selectively be driven by either the engine or an electric motor} - F16H 57/0471: {Bearing} - F16H 57/0479: {Gears or bearings on planet carriers} - F05D 2220/32: in gas turbines - F05D 2220/76: an electrical generator - F05D 2220/766: via a direct connection, i.e. a gearless transmission - F05D 2260/40311: of the epicyclical, planetary or differential type - F05D 2260/98: Lubrication - F01D: NON-POSITIVE DISPLACEMENT MACHINES OR ENGINES, e.g. STEAM TURBINES (machines or engines for liquids F03; non-positive displacement pumps F04D) - 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) - F16H: GEARING - F05D: INDEXING SCHEME FOR ASPECTS RELATING TO NON-POSITIVE-DISPLACEMENT MACHINES OR ENGINES, GAS-TURBINES OR JET-PROPULSION PLANTS ## Abstract A gas turbine engine has a turbine driving a gear reduction. The gear reduction drives a fan drive shaft assembly to, in turn, drive a fan rotor at a reduced speed relative to the turbine. A generator generates current upon rotation of the fan drive assembly. The generator supplies electric current to an electric motor driven pump. The electric motor driven pump delivers lubricant to components within the gear reduction. ## Claims ### Claim 1 A gas turbine engine comprising: a turbine driving a gear reduction, and said gear reduction driving a fan drive shaft assembly to, in turn, drive a fan rotor at a reduced speed relative to said turbine; a generator to generate current upon rotation of said fan drive assembly; said generator supplying electric current to an electric motor driven pump, said electric motor driven pump delivering lubricant to components within said gear reduction; and wherein said fan drive assembly includes a shell which is driven to rotate with a ring gear in said gear reduction, and said shell having an inner surface, and a chamber being defined between said shell inner surface and said gear reduction and said generator being positioned within said chamber. ### Claim 2 (depends on 1) The gas turbine engine as set forth in claim 1, wherein said components in said gear reduction include a journal bearing for supporting gears within said gear reduction. ### Claim 3 (depends on 1) The gas turbine engine as set forth in claim 1, wherein said generator includes a generator rotor provided to rotate with said fan drive assembly and a stator mounted on stationary structure, such that rotation of said fan drive assembly relative to said stator generates current to power said electric motor driven pump. ### Claim 4 (depends on 3) The gas turbine engine as set forth in claim 3, wherein said fan drive assembly includes a fan drive shaft that is driven by said shell. ### Claim 5 (depends on 3) The gas turbine engine as set forth in claim 3, wherein said generator rotor is mounted on said fan drive shaft. ### Claim 6 (depends on 3) The gas turbine engine as set forth in claim 3, wherein said fan rotor is driven to rotate under windmilling conditions in either direction of rotation and said generator generating current in both of said directions when said fan rotor is driven during windmilling conditions. ### Claim 7 (depends on 6) The gas turbine engine as set forth in claim 6, wherein said generator generating current during normal powered operation of the gas turbine engine. ### Claim 8 (depends on 3) The gas turbine engine as set forth in claim 3, wherein said generator rotor is mounted on said shell. ### Claim 9 (depends on 3) The gas turbine engine as set forth in claim 3, wherein said generator generating current during normal powered operation of the gas turbine engine. ### Claim 10 (depends on 1) The gas turbine engine as set forth in claim 1, wherein said generator includes a generator rotor provided to rotate with said fan drive assembly and a stator mounted on stationary structure, such that rotation of said fan drive assembly relative to said stator generates current to power said electric motor driven pump. ### Claim 11 (depends on 10) The gas turbine engine as set forth in claim 10, wherein said generator rotor is mounted on said shell. ### Claim 12 (depends on 1) The gas turbine engine as set forth in claim 1, wherein said generator includes a rotor generator provided to rotate with said fan drive assembly and a stator mounted on stationary structure, such that rotation of said fan drive assembly relative to said stator generates current to power said electric motor driven pump. ### Claim 13 (depends on 12) The gas turbine engine as set forth in claim 12, wherein said fan drive assembly includes a fan drive shaft. ### Claim 14 (depends on 13) The gas turbine engine as set forth in claim 13, wherein said rotor generator is mounted on said fan drive shaft. ### Claim 15 (depends on 1) The gas turbine engine as set forth in claim 1, wherein said generator generating current during normal powered operation of the gas turbine engine. ### Claim 16 (depends on 15) The gas turbine engine as set forth in claim 15, wherein said fan rotor is driven to rotate under windmilling conditions in either direction of rotation and said generator generating current in both of said directions when said fan rotor is driven during windmilling conditions. ### Claim 17 (depends on 1) The gas turbine engine as set forth in claim 1, wherein said fan rotor is driven to rotate under windmilling conditions in either direction of rotation and said generator generating current in both of said directions when said fan rotor is driven during windmilling conditions. ### Claim 18 (depends on 17) The gas turbine engine as set forth in claim 17, wherein said generator includes a generator rotor provided to rotate with said fan drive assembly and a stator mounted on stationary structure, such that rotation of said fan drive assembly relative to said stator generates current to power said electric motor driven pump.