# US 12,015,327 B2 · Methods, systems, and apparatuses for passive end-turn cooling for an electric motor using gravity > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 12,015,327 B2 - Document ID: US12015327B2 - Status: Granted - Kind: B2 - Application number: 17/305,639 - Filed: 2021-07-12 - Published: 2023-01-12 - Granted: 2024-06-18 - Earliest claimed: 2021-07-12 - Assignees: GM Global Technology Operations LLC - Applicants: GM Global Technology Operations LLC - Inventors: SeungHwan Keum; Jun-mo Kang; Insu Chang; Young J. Kim - Web page: https://patentgrep.com/patent/US12015327B2 ## CPC - H02K 9/19: for machines with closed casing and closed-circuit cooling using a liquid cooling medium, e.g. oil - B05B 3/008: {comprising a wobbling or nutating element, e.g. rotating about an axis describing a cone during spraying (B05B3/043 takes precedence)} - B05B 13/0405: {with reciprocating or oscillating spray heads (B05B13/0436, B05B13/0442, B05B13/0447, B05B13/0468 take precedence)} - H02K: DYNAMO-ELECTRIC MACHINES (dynamo-electric relays H01H53/00; conversion of DC or AC input power into surge output power {H03K3/53}) - B05B: SPRAYING APPARATUS; ATOMISING APPARATUS; NOZZLES (spray-mixers with nozzles B01F25/72; processes for applying liquids or other fluent materials to surfaces by spraying B05D) ## Abstract In various embodiments, methods, systems, and vehicle apparatuses are provided. A system provides a gravity drive to distribute coolant oil flow including a nozzle for directing a flow of coolant oil over a surface of an electric motor wherein the flow of the coolant oil is caused by a gravity drive; a connector that is coupled to the nozzle that enables the nozzle to sway in response to external forces encountered by a vehicle operation and to distribute coolant oil over the exterior surface of the electric motor; and a counterweight that is coupled to the nozzle that provides a countermeasure to the external forces encountered by the vehicle operation to cause the nozzle to sway in a manner that enables the coolant oil distributed evenly across the exterior surface of the electric motor. ## Claims ### Claim 1 A system that provides a gravity drive to distribute coolant oil flow in an apparatus, comprising: a nozzle for directing a flow of coolant oil over an exterior surface of an electric motor wherein the flow of the coolant oil is caused by the gravity drive; a connector coupled to the nozzle that enables the nozzle to sway in response to external forces encountered by an operation of the apparatus, and to distribute coolant oil over the exterior surface of the electric motor; and a counterweight that is coupled to the nozzle that provides a countermeasure to the external forces encountered by the operation to cause the nozzle to sway in a manner that enables the coolant oil to be distributed evenly across the exterior surface of the electric motor. ### Claim 2 (depends on 1) The system of claim 1, further comprising: the nozzle coupled to the connector, the connector comprises a pivot to enable the nozzle to swing in an opposite direction to torque applied from the counterweight in response to external forces encountered by the operation. ### Claim 3 (depends on 2) The system of claim 2, further comprising: the counterweight coupled to a set of gears that provides a counterclockwise and a clockwise torque in response to the external forces to cause the nozzle to sway in the manner that enables the coolant oil distributed evenly across the exterior surface of the electric motor. ### Claim 4 (depends on 3) The system of claim 3, further comprising: the exterior surface of the electric motor comprises winding end turns of a stator wherein the end turns are distributed with coolant oil evenly by nozzle sway controlled in part by the counterweight. ### Claim 5 (depends on 4) The system of claim 4, further comprising: the counterweight comprises a passive device that senses apparatus movement and actuates a countermeasure by providing a counterclockwise and clockwise torque in response to the external forces to cause the nozzle to sway in the manner that enables the coolant oil distributed evenly across the exterior surface of the electric motor. ### Claim 6 (depends on 5) The system of claim 5, further comprising: a link that couples the set of gears to the counterweight to reverse the direction of the nozzle sway in response to the external forces to the nozzle generated by the operation. ### Claim 7 (depends on 6) The system of claim 6, wherein the set of gears comprises a first gear that is coupled to the counterweight that provides a counterclockwise torque, and a second gear coupled to the first gear and to the link that provides a clockwise torque driver to counter the external forces that cause the nozzle sway to receive a reverse directional force. ### Claim 8 (depends on 7) The system of claim 7, wherein the connector comprises a rubber connector. ### Claim 9 A vehicle apparatus comprising: a gravity drive to distribute coolant oil flow from a nozzle over an exterior surface of an electric motor; a connector coupled to the nozzle that enables the nozzle to sway in response to external forces encountered by a vehicle operation and to distribute coolant oil over the exterior surface of the electric motor; and a counterweight that is coupled to the nozzle that provides a countermeasure to the external forces encountered by the vehicle operation to cause the nozzle to sway in a manner that enables the coolant oil to be distributed evenly across the exterior surface of the electric motor. ### Claim 10 (depends on 9) The vehicle apparatus of claim 9, further comprising: the nozzle coupled to the connector that comprises a pivot to enable the nozzle to swing in an opposite direction by torque applied from the counterweight in response to external forces encountered by the vehicle operation. ### Claim 11 (depends on 10) The vehicle apparatus of claim 10, further comprising: the counterweight coupled to a set of gears that provides a counterclockwise and a clockwise torque in response to the external forces to cause the nozzle to sway in the manner that enables the coolant oil distributed evenly across the exterior surface of the electric motor. ### Claim 12 (depends on 11) The vehicle apparatus of claim 11, further comprising: the exterior surface of the electric motor comprises winding end turns of a stator wherein the end turns are distributed with coolant oil evenly by nozzle sway controlled in part by the counterweight. ### Claim 13 (depends on 12) The vehicle apparatus of claim 12, further comprising: the counterweight comprises a passive system that senses vehicle movement and actuates a countermeasure by providing a counterclockwise and clockwise torque in response to the external forces to cause the nozzle to sway in a manner that enables the coolant oil to be distributed evenly across the exterior surface of the electric motor. ### Claim 14 (depends on 13) The vehicle apparatus of claim 13, further comprising: a bar that couples the set of gears to the counterweight to reverse the direction of the nozzle sway in response to the external forces to the nozzle generated by the vehicle operation. ### Claim 15 (depends on 14) The vehicle apparatus of claim 14, wherein the set of gears comprises a first gear that is coupled to the counterweight that provides a counterclockwise torque, and a second gear coupled to the first gear and to the link that provides a clockwise torque driver to counter the external forces that cause the nozzle sway to receive a reverse directional force. ### Claim 16 (depends on 15) The vehicle apparatus of claim 15, wherein the bar acts like a sway bar to counter nozzle movement. ### Claim 17 A method to distribute coolant oil evenly across an exterior surface of an electric motor of an apparatus, comprising: directing a flow of coolant oil by a nozzle using a gravity drive over the exterior surface of the electric motor; coupling the nozzle to a rubber connector that enables the nozzle to sway in response to external forces encountered by a movement of the apparatus and to distribute coolant oil over the exterior surface of the electric motor wherein the external forces are resultant from gradients and apparatus accelerations; and coupling a counterweight to the nozzle to provide a countermeasure to the external forces to cause the nozzle to sway in a manner that enables the coolant oil to be distributed evenly across the exterior surface of the electric motor. ### Claim 18 (depends on 17) The method of claim 17, further comprising: wherein the rubber connector comprises a pivot mechanism to enable the nozzle to swing in an opposite direction by torque applied from the counterweight in response to external forces. ### Claim 19 (depends on 18) The method of claim 18, further comprising: coupling the counterweight to a set of gears that provides a counterclockwise and a clockwise torque in response to the external forces to cause the nozzle to sway in a manner that enables the coolant oil distributed evenly across the exterior surface of the electric motor. ### Claim 20 (depends on 19) The method of claim 19, further comprising: wherein the exterior surface of the electric motor comprises winding end turns of a stator; and wherein the end turns are distributed with coolant oil evenly by nozzle sway controlled in part by the counterweight.