# US 12,224,648 B2 · Brake for energy storage device > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 12,224,648 B2 - Document ID: US12224648B2 - Status: Granted - Kind: B2 - Application number: 17/452,268 - Filed: 2021-10-26 - Published: 2023-04-27 - Granted: 2025-02-11 - Earliest claimed: 2021-10-26 - Assignees: Deere & Company - Applicants: Deere & Company - Inventors: Lashun R. Mowers; Randall L. Long; Stacy K. Worley - Web page: https://patentgrep.com/patent/US12224648B2 ## CPC - H02K 7/102: with friction brakes - E02F 9/207: {of the type electric propulsion units, e.g. electric motors or generators} - F03G 3/08: using flywheels - F16D 49/00: Brakes with a braking member co-operating with the periphery of a drum, wheel-rim, or the like (similar clutches F16D13/10) - F16D 65/18: adapted for drawing members together {, e.g. for disc brakes} - H02K 7/02: Additional mass for increasing inertia, e.g. flywheels - H02K 7/025: {for power storage} - H02K 21/24: with magnets axially facing the armatures, e.g. hub-type cycle dynamos - B60K 6/105: {the accumulator being a flywheel} - B60K 6/40: characterised by the assembly or relative disposition of components - H02K: DYNAMO-ELECTRIC MACHINES (dynamo-electric relays H01H53/00; conversion of DC or AC input power into surge output power {H03K3/53}) - E02F: DREDGING; SOIL-SHIFTING (winning peat E21C49/00) - F03G: SPRING, WEIGHT, INERTIA OR LIKE MOTORS; MECHANICAL-POWER PRODUCING DEVICES OR MECHANISMS, NOT OTHERWISE PROVIDED FOR OR USING ENERGY SOURCES NOT OTHERWISE PROVIDED FOR (arrangements in connection with power supply in vehicles from force of nature B60K16/00; electric propulsion with power supply in vehicles from force of nature B60L8/00) - F16D: COUPLINGS FOR TRANSMITTING ROTATION; CLUTCHES; BRAKES - B60K: ARRANGEMENT OR MOUNTING OF PROPULSION UNITS OR OF TRANSMISSIONS IN VEHICLES; ARRANGEMENT OR MOUNTING OF PLURAL DIVERSE PRIME-MOVERS IN VEHICLES; AUXILIARY DRIVES FOR VEHICLES; INSTRUMENTATION OR DASHBOARDS FOR VEHICLES; ARRANGEMENTS IN CONNECTION WITH COOLING, AIR INTAKE, GAS EXHAUST OR FUEL SUPPLY OF PROPULSION UNITS IN VEHICLES ## Abstract An energy storage device is mounted at a horizontal end of a work vehicle for storing energy generated from operation of the work vehicle. The energy storage device includes a stator of an electric machine having a stator axis, a rotor of the electric machine fixed for rotation with a rotating ballast and configured for rotation about the stator axis, a housing disposed around the rotor and configured to contain the electric machine, and a brake configured to absorb kinetic energy of the rotor. ## Claims ### Claim 1 An energy storage device mounted at an end of a horizontally extending chassis of a work vehicle for storing energy generated from operation of the work vehicle, the energy storage device comprising: a stator of an electric machine having a stator axis extending in a vertical direction; a rotor of the electric machine extending in the vertical direction, fixed for rotation with a rotating ballast and configured for rotation about the stator axis extending in the vertical direction, the rotor configured for rotation about the stator and creating a vertical load rotating about the stator axis; a housing disposed around the rotor and configured to contain the electric machine; a brake disposed at an outer surface of the rotor and configured to absorb kinetic energy of the rotor upon contact of the brake with the housing, the brake including a tapered surface extending about the stator axis; and a thrust bearing supporting the vertical load rotating about the stator axis, the thrust bearing configured to apply an electromagnetic force or a hydrodynamic force to the rotor and to change a position of the rotor along the stator axis, wherein a decrease in the electromagnetic force or the hydrodynamic force applied to the rotor facilitates contact of the tapered surface of the brake with the housing. ### Claim 2 (depends on 1) The energy storage device of claim 1, wherein the rotor is axially spaced from the stator. ### Claim 3 (depends on 1) The energy storage device of claim 1, wherein the rotor is both axially and radially spaced from the stator. ### Claim 4 (depends on 1) The energy storage device of claim 1, wherein the a surface area of the tapered surface of the brake being contacted increases based on a decrease of spacing between the rotor and the housing. ### Claim 5 (depends on 1) The energy storage device of claim 1, wherein the brake further includes an electrical control system configured to determine spacing between the rotor and the housing and activate a braking operation based on such spacing. ### Claim 6 (depends on 1) The energy storage device of claim 1, wherein the rotor comprises a plurality of magnets and the stator comprises a plurality of windings to form the electric machine, and wherein the brake is disposed around the plurality of magnets of the rotor of the electric machine. ### Claim 7 An energy storage device mounted at an end of a horizontally extending chassis of a work vehicle for storing energy generated from operation of the work vehicle, the energy storage device comprising: a stator of an electric machine having a stator axis extending in a vertical direction; a rotor of the electric machine extending in the vertical direction, fixed for rotation with a rotating ballast and configured for rotation about the stator axis extending in the vertical direction and creating a vertical load rotating about the stator axis; a housing disposed around the rotor and configured to contain the electric machine; and a brake disposed at an inner surface of the housing and configured to absorb kinetic energy of the rotor upon contact of the brake with the rotor, the brake including a tapered surface extending about the stator axis; and a thrust bearing supporting the vertical load rotating about the stator axis, the thrust bearing configured to apply an electromagnetic force or a hydrodynamic force to the rotor and to change a position of the rotor along the stator axis, wherein a decrease in the electromagnetic force or the hydrodynamic force applied to the rotor facilitates contact of the tapered surface of the brake with the housing. ### Claim 8 (depends on 7) The energy storage device of claim 7, wherein the rotor is axially spaced from the stator. ### Claim 9 (depends on 7) The energy storage device of claim 7, wherein the rotor is both axially and radially spaced from the stator. ### Claim 10 (depends on 7) The energy storage device of claim 7, wherein a surface area of the tapered surface of the brake being contacted increases based on a decrease of spacing between the rotor and the housing. ### Claim 11 (depends on 7) The energy storage device of claim 7, wherein the brake further includes an electrical control system configured to determine spacing between the rotor and the housing and activate a braking operation based on such spacing. ### Claim 12 (depends on 7) The energy storage device of claim 7, wherein the rotor comprises a plurality of magnets and the stator comprises a plurality of windings to form the electric machine, and wherein the brake is disposed around the plurality of magnets of the rotor of the electric machine. ### Claim 13 An energy storage device mounted at an end of a horizontally extending chassis of a work vehicle for storing energy generated from operation of the work vehicle, the energy storage device comprising: a stator of an electric machine having a stator axis extending in a vertical direction; a rotor of the electric machine extending in a vertical direction fixed for rotation with a rotating ballast and configured for rotation about the stator axis extending in a vertical direction and creating a vertical load rotating about the stator axis; a housing disposed around the rotor and configured to contain the electric machine; and a brake having a first brake portion disposed at an inner surface of the housing and a second brake portion disposed at an outer surface of the rotor, wherein the brake is configured to absorb kinetic energy of the rotor upon contact of the first brake portion with the second brake portion, the brake including a tapered surface extending about the stator axis; and a thrust bearing supporting the vertical load rotating about the stator axis, the thrust bearing configured to apply an electromagnetic force or a hydrodynamic force to the rotor and to change a position of the rotor along the stator axis, wherein a decrease in the electromagnetic force or the hydrodynamic force applied to the rotor facilitates contact of the tapered surface of the brake with the housing. ### Claim 14 (depends on 13) The energy storage device of claim 13, wherein the rotor is axially spaced from the stator. ### Claim 15 (depends on 13) The energy storage device of claim 13, wherein the rotor is both axially and radially spaced from the stator. ### Claim 16 (depends on 13) The energy storage device of claim 13, wherein a surface area of the tapered surface of the brake being contacted increases based on a decrease of spacing between the rotor and the housing. ### Claim 17 (depends on 13) The energy storage device of claim 13, wherein the brake further includes an electrical control system configured to determine spacing between the rotor and the housing and activate a braking operation based on such spacing. ### Claim 18 (depends on 13) The energy storage device of claim 13, wherein the rotor comprises a plurality of magnets and the stator comprises a plurality of windings to form the electric machine, and wherein the brake is disposed around the plurality of magnets of the rotor of the electric machine.