# US 12,768,412 B2 · Electromechanical brake system having multiple screw-nut mechanisms > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 12,768,412 B2 - Document ID: US12768412B2 - Status: Granted - Kind: B2 - Application number: 18/509,295 - Filed: 2023-11-14 - Published: 2025-05-15 - Granted: 2026-10-20 - Earliest claimed: 2023-11-14 - Assignees: Hl Mando Corporation - Applicants: Hl Mando Corporation - Inventors: Troy Strieter; Jeff Lauman - Web page: https://patentgrep.com/patent/US12768412B2 ## CPC - F16D 65/18: adapted for drawing members together {, e.g. for disc brakes} - F16D 2121/24: using motors - F16D 2125/40: Screw-and-nut - F16D 2125/48: with parallel stationary axes, e.g. spur gears - F16D: COUPLINGS FOR TRANSMITTING ROTATION; CLUTCHES; BRAKES ## Abstract An electromechanical brake system may comprise: a pair of screw-nut mechanisms comprising first and second screw-nut mechanisms, each screw-nut mechanism comprising a rotatable body configured to be rotatable and a translatable body operably coupled with the rotatable body, the translatable body configured to be axially translatable relative to the rotatable body to move a brake pad assembly according to rotation of the rotatable body, wherein the rotatable body of the first screw-nut mechanism is provided with the first gear and the rotatable body of the second screw-nut mechanism is provided with the second gear; an actuator assembly configured to provide a torque; and a drive gear rotatably engaged between the first gear of the rotatable body of the first screw-nut mechanism and the second gear of the rotatable body of the second screw-nut mechanism and operably connected to the actuator assembly to be rotated by the torque of the actuator. ## Claims ### Claim 1 An electromechanical brake system comprising: a pair of screw-nut mechanisms comprising first and second screw-nut mechanisms, each screw-nut mechanism comprising a rotatable body configured to be rotatable and a translatable body operably coupled with the rotatable body, the translatable body configured to be axially translatable relative to the rotatable body to move a brake pad assembly according to rotation of the rotatable body, wherein the rotatable body of the first screw-nut mechanism is provided with a first gear and the rotatable body of the second screw-nut mechanism is provided with a second gear; an actuator assembly configured to provide a torque; and a drive gear rotatably engaged between the first gear of the rotatable body of the first screw-nut mechanism and the second gear of the rotatable body of the second screw-out mechanism and operably connected to the actuator assembly to be rotated by the torque of the actuator, wherein the actuator assembly comprises: a motor having a motor shaft, and a belt drive mechanism operably connecting between the motor shaft and the drive gear engaged between the first and second gears of the rotatable bodies of the first and second screw-nut mechanisms. ### Claim 2 (depends on 1) The electromechanical brake system of claim 1, wherein the drive gear is configured to rotate both the first gear of the rotatable body of the first screw-nut mechanism and the second gear of the rotatable body of the second screw-nut mechanism simultaneously by the torque of the actuator to rotate the rotatable body of the first screw-nut mechanism and the rotatable body of the second screw-nut mechanism simultaneously. ### Claim 3 (depends on 1) The electromechanical brake system of claim 1, wherein the translatable body of the first screw-nut mechanism and the translatable body of the second screw-nut mechanism are operably coupled to the brake pad assembly so that the translatable body of the first screw-nut mechanism and the translatable body of the second screw-nut mechanism simultaneously move the brake pad assembly according to the rotation of the rotatable body of the first screw-nut mechanism and the rotatable body of the second screw-nut mechanism to apply or release brake. ### Claim 4 (depends on 1) The electromechanical brake system of claim 1, wherein: the first gear is fixed to the rotatable body of the first screw-nut mechanism, and the second gear is fixed to the rotatable body of the second screw-nut mechanism. ### Claim 5 (depends on 1) The electromechanical brake system of claim 1, wherein: teeth of the first gear are directly formed on the rotatable body of the first screw-nut mechanism, and teeth of the second gear are directly formed on the rotatable body of the second screw-nut mechanism. ### Claim 6 (depends on 1) The electromechanical brake system of claim 1, wherein diameters of the first gear of the first screw-nut mechanism and the second gear of the second screw-nut mechanism are larger than a diameter of the drive gear rotatably engaged between the first gear and the second gear. ### Claim 7 (depends on 1) The electromechanical brake system of claim 1, wherein: the rotatable body and the translatable body of the first screw-nut mechanism and the rotatable body and the translatable body of the second screw-nut mechanism have threaded grooves, and a threaded direction of the threaded grooves of the rotatable body and the translatable body of the first screw-nut mechanism and a threaded direction of the threaded grooves of the rotatable body and the translatable body of the second screw-nut mechanism are same as each other. ### Claim 8 (depends on 1) The electromechanical brake system of claim 1, wherein the drive gear, the first gear of the rotatable body of the first screw-nut mechanism and the second gear of the rotatable body of the second screw-nut mechanism are arranged on a same plane as each other. ### Claim 9 (depends on 1) The electromechanical brake system of claim 1, wherein the belt drive mechanism comprises: a drive belt; a drive pulley provided on the motor shaft; and a driven pulley connected to the drive pulley of the motor shaft via the drive belt, wherein the driven pulley is provided on an intermediate shaft operably connecting between the belt drive mechanism and the drive gear. ### Claim 10 (depends on 9) The electromechanical brake system of claim 9, wherein a diameter of the drive pulley provided on the motor shaft is smaller than a diameter of the driven pulley provided on the intermediate shaft operably connecting between the belt drive mechanism and the drive gear. ### Claim 11 (depends on 10) The electromechanical brake system of claim 10, wherein the intermediate shaft has a first portion where the driven pulley of the belt drive mechanism connected to the drive pulley of the motor shaft is provided and a second portion where the drive gear engaged between the first and second gears of the rotatable bodies of the first and second screw-nut mechanisms is provided. ### Claim 12 (depends on 9) The electromechanical brake system of claim 9, wherein the driven pulley of the belt drive mechanism connected to the drive pulley of the motor shaft via the drive belt is fixed to the intermediate shaft operably connecting between the belt drive mechanism and the drive gear. ### Claim 13 (depends on 9) The electromechanical brake system of claim 9, wherein the intermediate shaft operably connecting between the belt drive mechanism and the drive gear has a flange protruding radially from an outer circumferential surface of the intermediate shaft to support at least a part of one side of the driven pulley of the belt drive mechanism fixedly coupled to the intermediate shaft. ### Claim 14 (depends on 9) The electromechanical brake system of claim 9, wherein: the driven pulley provided on the intermediate shaft operably connecting between the belt drive mechanism and the drive gear has an inner wall fixedly coupled to the intermediate shaft and an outer wall having an outer surface rotatably engaged with the drive belt, and one or more bearings configured to rotatably support the inner wall of the driven pulley are disposed inside a space formed between the inner wall and the outer wall of the driven pulley. ### Claim 15 (depends on 1) The electromechanical brake system of claim 1, wherein: the rotatable body of the first screw-nut mechanism has an inner race of a first bearing rotatably supporting the rotatable body of the first screw-nut mechanism and the first gear rotatably engaged with the drive gear, and the rotatable body of the second screw-nut mechanism has an inner race of a second bearing rotatably supporting the rotatable body of the second screw-nut mechanism and the second gear rotatably engaged with the drive gear. ### Claim 16 (depends on 1) The electromechanical brake system of claim 1, wherein: a diameter of the first gear of the first screw-nut drive mechanism is larger than an outer diameter of the rotatable body of the first screw-nut drive mechanism, and a diameter of the second gear of the second screw-nut drive mechanism is larger than an outer diameter of the rotatable body of the second screw-nut drive mechanism.