# US 8,771,123 B2 · Reversible planetary gear assembly > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 8,771,123 B2 - Document ID: US8771123B2 - Status: Granted - Kind: B2 - Application number: 13/873,900 - Filed: 2013-04-30 - Published: 2013-09-12 - Granted: 2014-07-08 - Earliest claimed: 2009-11-16 - Assignees: Remy Technologies, L.L.C. - Applicants: Remy Technologies, LLC - Inventors: Balazs Palfai; Bradley D. Chamberlin; Larry A. Kubes - Web page: https://patentgrep.com/patent/US8771123B2 ## CPC - F16H 3/44: using gears having orbital motion - H02K 7/116: with gears - F16H 57/082: {Planet carriers} - Y10T 29/49012: Rotor - Y10T 29/49464: Assembling of gear into force transmitting device - F16H: GEARING - H02K: DYNAMO-ELECTRIC MACHINES (dynamo-electric relays H01H53/00; conversion of DC or AC input power into surge output power {H03K3/53}) - Y10T: TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION ## Abstract A planetary gear assembly includes a ring gear configured for connection to a rotor of an electric motor when in a first position and configured for connection to a housing of the electric motor when in a second position, a sun gear configured for connection to the housing when the ring gear is in the first position and configured for connection to the rotor when the ring gear is in the second position, and a plurality of planet gears configured to mesh with the ring gear and the sun gear. ## Claims ### Claim 1 A planetary gear assembly comprising: a first planetary gear component configured for connection to an electric motor in at least two different positions including a first position and a second position; and a second planetary gear component configured for connection to an electric motor in at least two different positions including a first position and a second position; wherein the first planetary gear component is connected to a rotor of an electric motor in the first position and the second planetary gear component is disconnected from the rotor of the electric machine in the first position; and wherein the first planetary gear component is disconnected from the rotor of the electric machine in the second position and the second planetary gear component is connected to the rotor of the electric machine in the second position. ### Claim 2 (depends on 1) The planetary gear assembly of claim 1 wherein the first planetary gear component is a ring gear and the second planetary gear component is a sun gear, the planetary gear assembly further comprising a plurality of planet gears positioned between the ring gear and the sun gear when the ring gear and sun gear are respectively in the first position and when the ring gear and sun gear are respectively in the second position. ### Claim 3 (depends on 2) The planetary gear assembly of claim 2 further comprising a carrier coupled to the planet gears. ### Claim 4 (depends on 3) The planetary gear assembly of claim 3, wherein an output portion of the carrier is at least partially positioned within a cavity defined by the sun gear. ### Claim 5 (depends on 3) The planetary gear assembly of claim 3 wherein the rotor rotates the carrier with a first gear ratio when the ring gear is in the first position, and the rotor rotates the carrier with a second gear ratio when the ring gear is in the second position. ### Claim 6 (depends on 2) The planetary gear assembly of claim 2 wherein the electric motor includes a housing defining an interior space and the planets gears are positioned within the interior space. ### Claim 7 (depends on 1) The planetary gear assembly of claim 1 wherein the electric motor is a traction motor, and the traction motor is positioned within a vehicle. ### Claim 8 An electric motor assembly comprising: a housing; a stator positioned within the housing; a rotor positioned within the housing and configured to rotate relative to the stator; and a planetary gear assembly coupled to the rotor, the planetary gear assembly comprising a plurality of planetary gear components, at least one of the plurality of planetary gear components a reversible component configured to be selectively arranged in a first position and a second position within the planetary gear assembly, the reversible component being reversed relative to the first position when in the second position, wherein the planetary gear assembly is configured to deliver an output at a first gear ratio relative to the rotor when the reversible component is in the first position and deliver the output at a second gear ratio relative to the rotor when the reversible component is in the second position. ### Claim 9 (depends on 8) The electric motor assembly of claim 8 wherein in the plurality of planetary gear components include a ring gear, a sun gear, a plurality of planet gears, and a carrier. ### Claim 10 (depends on 9) The electric motor assembly of claim 9 wherein the reversible component is the ring gear, the ring gear connected to the rotor in the first position and connected to the housing in the second position. ### Claim 11 (depends on 9) The electric motor assembly of claim 9 further comprising a carrier connected to the plurality of planet gears, wherein the carrier is the output member of the planetary gear assembly when the reversible component is in the first position and the second position. ### Claim 12 (depends on 9) The electric motor assembly of claim 9 wherein the reversible component is the sun gear, the sun gear connected to the housing in the first position and connected to the rotor in the second position. ### Claim 13 (depends on 9) The electric motor assembly of claim 9 wherein both the ring gear and the sun gear are reversible components. ### Claim 14 (depends on 9) The electric motor assembly of claim 9 wherein the carrier is configured to rotate in the planetary gear assembly when the rotor rotates and the reversible component is in the first position and the second position. ### Claim 15 (depends on 9) The electric motor assembly of claim 9 wherein the carrier is configured to remain stationary in the planetary gear assembly when the rotor rotates and the reversible component is in the first position and the second position. ### Claim 16 A method for assembling an electric machine, the method comprising: providing a planetary gear assembly including a planetary gear component configured for connection to an electric motor in at least two different positions including a first position and a second position, the second position being reversed relative to the first position; selecting one of a first gear ratio and a second gear ratio for the output of the planetary gear assembly relative to the rotor, the first gear ratio different than the second gear ratio; connecting the planetary gear assembly to a rotor of the electric machine with the planetary gear component in the first position if the first gear ratio is selected; and connecting the planetary gear assembly to the rotor of the electric machine with the planetary gear component in the second position if the second gear ratio is selected. ### Claim 17 (depends on 16) The method of claim 16 wherein the planetary gear component is concentrically oriented along an axis of rotation of the rotor when in the first position and the second position. ### Claim 18 (depends on 16) The method of claim 16 wherein the planetary gear component is a sun gear, wherein the sun gear is connected to a housing of the electric machine when in the first position and is connected to the rotor when in the second position. ### Claim 19 (depends on 16) The method of claim 16 wherein the planetary gear component is a first reversible component and the planetary gear assembly further comprises a second reversible component configured for connection to the electric motor in at least two different positions including a first position and a second position. ### Claim 20 (depends on 19) The method of claim 19, wherein connecting the planetary gear assembly to the rotor of the electric machine with the first reversible component in the first position further comprises placing the second reversible component in the second position, and wherein connecting the planetary gear assembly to the rotor of the electric machine with the first reversible component in the second position further comprises placing the second reversible component in the first position.