# US 2021/0277876 A1 · Planetary gearbox, drive train, wind turbine and industrial application > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 2021/0277876 A1 - Document ID: US20210277876A1 - Status: Published application - Kind: A1 - Application number: 17/255,892 - Filed: 2019-06-05 - Published: 2021-09-09 - Earliest claimed: 2018-06-25 - Assignees: Flender GmbH - Applicants: Flender GmbH - Inventors: DOMINIKUS DANERS; ARNO KLEIN-HITPASS - Web page: https://patentgrep.com/patent/US20210277876A1 ## CPC - F03D 15/00: Transmission of mechanical power - F16H 37/041: {for conveying rotary motion with constant gear ratio} - F03D 9/25: the apparatus being an electrical generator (F03D9/22 takes precedence) - F03D 80/70: Bearing or lubricating arrangements - F16H 1/46: Systems consisting of a plurality of gear trains each with orbital gears, {i.e. systems having three or more central gears} - F05B 2220/706: an electrical generator - F05B 2240/54: Radial bearings - F05B 2260/40311: of the epicyclic, planetary or differential type - Y02E 10/72: Wind turbines with rotation axis in wind direction - F03D: WIND MOTORS - F16H: GEARING - F05B: INDEXING SCHEME RELATING TO WIND, SPRING, WEIGHT, INERTIA OR LIKE MOTORS, TO MACHINES OR ENGINES FOR LIQUIDS COVERED BY SUBCLASSES F03B, F03D AND F03G - Y02E: REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION ## Abstract A planetary gearbox includes an input shaft configured to introduce a driving torque of at least 1500 kNm, and three consecutively connected gearing stages operably connected to the input shaft for supply of the driving torque unbranched through each of the gearing stages. A first one of the gear stages and a second one of the gear stages are configured as planetary stages, respectively. Each of the planetary stages includes a ring gear embodied as a stationary gearing component. A third one of the gear stages is embodied as a planetary stage having a stationary gearing component. The first one of the gearing stages includes at least five planetary gears. ## Claims ### Claim at position 1 -14. (canceled) ### Claim 15 A planetary gearbox, comprising: an input shaft configured to introduce a driving torque of at least 1500 kNm, and three consecutively connected gearing stages operably connected to the input shaft for supply of the driving torque unbranched through each of the gearing stages, with a first one of the gear stages and a second one of the gear stages being configured as planetary stages, respectively, each of the planetary stages including a ring gear embodied as a stationary gearing component, and with a third one of the gear stages being embodied as a planetary stage having a stationary gearing component, said first one of the gearing stages including at least five planetary gears. ### Claim 16 (depends on 15) The planetary gearbox of claim 15, wherein the third one of the gearing stages is configured for direct coupling to a generator. ### Claim 17 (depends on 15) The planetary gearbox of claim 15, further comprising a fourth gearing stage embodied as a spur gear stage, said third one of the gearing stages being connected to the fourth gearing stage. ### Claim 18 (depends on 17) The planetary gearbox of claim 17, wherein the fourth gearing stage is configured for direct coupling to a generator with three, four, eight or 16 pole pairs. ### Claim 19 (depends on 15) The planetary gearbox of claim 15, wherein the second one of the gearing stages includes at least four planetary gears. ### Claim 20 (depends on 15) The planetary gearbox of claim 15, wherein the third one of the gearing stages includes at least three planetary gears. ### Claim 21 (depends on 15) The planetary gearbox of claim 15, wherein the first one of the gearing stages has a fixed carrier train ratio of 2.5 to 4.4 and/or the second one of the gearing stages has a fixed carrier train ratio of 2.5 to 6. ### Claim 22 (depends on 15) The planetary gearbox of claim 15, wherein the second one of the gearing stages includes a planetary carrier which is connected in a rotationally fixed manner to a sun gear of the first one of the gearing stages. ### Claim 23 (depends on 15) The planetary gearbox of claim 15, further comprising: a housing, and a bearing attached to a wall of the housing and configured to accommodate a planetary carrier of the first one of the gear stages for rotation, and/or a bearing attached to a wall of the housing and configured to accommodate a planetary carrier of the third one of the gear stages for rotation. ### Claim 24 (depends on 17) The planetary gearbox of claim 17, wherein at least one of the first, second, third and fourth gearing stages is embodied to couple-in a regulating power. ### Claim 25 A drive train, comprising: a generator; a gearbox connected in a torque-transmitting manner to the generator, said gearbox being configured as a planetary gearbox which comprises an input shaft configured to introduce a driving torque of at least 1500 kNm, and three consecutively connected gearing stages operably connected to the input shaft for supply of the driving torque unbranched through each of the gearing stages, with a first one of the gear stages and a second one of the gear stages being configured as planetary stages, respectively, each of the planetary stages including a ring gear embodied as a stationary gearing component, and with a third one of the gear stages being embodied as a planetary stage having a stationary gearing component, said first one of the gearing stages including at least five planetary gears; and a rotor shaft connected in a torque-transmitting manner to the input shaft of the gearbox. ### Claim 26 A wind turbine, comprising: a nacelle; a rotor attached to the nacelle; and a drive train connected in a torque-transmitting manner to the rotor and arranged in the nacelle, said drive train comprising a generator, a gearbox connected in a torque-transmitting manner to the generator, said gearbox being configured as a planetary gearbox which comprises an input shaft configured to introduce a driving torque of at least 1500 kNm, and three consecutively connected gearing stages operably connected to the input shaft for supply of the driving torque unbranched through each of the gearing stages, with a first one of the gear stages and a second one of the gear stages being configured as planetary stages, respectively, each of the planetary stages including a ring gear embodied as a stationary gearing component, and with a third one of the gear stages being embodied as a planetary stage having a stationary gearing component, said first one of the gearing stages including at least five planetary gears, and a rotor shaft connected in a torque-transmitting manner to the input shaft of the gearbox. ### Claim 27 (depends on 15) An industrial application, comprising: a gearbox coupled in a torque-transmitting manner to a mechanical application; and a drive unit connected in a torque-transmitting manner to the gearbox, wherein the gearbox is embodied as a planetary gearbox as set forth in claim 15.