# US 11,440,414 B2 · Electric vehicle > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 11,440,414 B2 - Document ID: US11440414B2 - Status: Granted - Kind: B2 - Application number: 16/666,557 - Filed: 2019-10-29 - Published: 2020-05-07 - Granted: 2022-09-13 - Earliest claimed: 2018-11-01 - Assignees: Toyota Jidosha Kabushiki Kaisha - Applicants: Toyota Jidosha Kabushiki Kaisha - Inventors: Shin Kurosaki - Web page: https://patentgrep.com/patent/US11440414B2 ## CPC - B60L 7/26: Controlling the braking effect - B60L 7/18: Controlling the braking effect (B60L7/12, B60L7/14, B60L7/16 take precedence) - B60L: PROPULSION OF ELECTRICALLY-PROPELLED VEHICLES (arrangements or mounting of electrical propulsion units or of plural diverse prime-movers for mutual or common propulsion in vehicles B60K1/00, B60K6/20; arrangements or mounting of electrical gearing in vehicles B60K17/12, B60K17/14; preventing wheel slip by reducing power in rail vehicles B61C15/08; dynamo-electric machines H02K; control or regulation of electric motors H02P); SUPPLYING ELECTRIC POWER FOR AUXILIARY EQUIPMENT OF ELECTRICALLY-PROPELLED VEHICLES (electric coupling devices combined with mechanical couplings of vehicles B60D1/64; electric heating for vehicles B60H1/00); ELECTRODYNAMIC BRAKE SYSTEMS FOR VEHICLES IN GENERAL (control or regulation of electric motors H02P); MAGNETIC SUSPENSION OR LEVITATION FOR VEHICLES; MONITORING OPERATING VARIABLES OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRIC SAFETY DEVICES FOR ELECTRICALLY-PROPELLED VEHICLES ## Abstract An electric vehicle without a propeller shaft including a rotating machine selectively functioning as an electric motor and a generator, configured to serve as a drive force source in the vehicle when the rotating machine functions as the electric motor, and functioning as the generator during running of the vehicle to thereby generate a regenerative brake force, and a wheel brake disposed on a wheel, used as a service brake, and generating a braking force corresponding to a brake request amount during running of the vehicle, the electric vehicle comprising: a third braking device disposed in a power transmission path between the rotating machine and a drive wheel to generate a braking force with a braking method other than regeneration during running of the vehicle. ## Claims ### Claim 1 An electric vehicle comprising: a rotating machine selectively functioning as an electric motor and a generator, configured to serve as a drive force source in the vehicle when the rotating machine functions as the electric motor, and configured to generate a regenerative brake force when the rotating machine functions as the generator; a wheel brake disposed on a drive wheel, used as a service brake, and generating a braking force corresponding to a brake request amount during running of the vehicle; an electromagnetic retarder disposed in a power transmission path between the rotating machine and the drive wheel to generate a braking force from an eddy current generated by an electromagnetic induction action during running of the vehicle; and an electric drive unit including a differential device disposed parallel to an output shaft of the rotating machine and transmitting power to the drive wheel, a speed reducing mechanism which reduces and transmits a rotation of the output shaft to the differential device, and a casing housing the differential device and the speed reducing mechanism together with the rotating machine, wherein the electric drive unit is a transversely-mounted electric drive unit mounted on the vehicle in a posture in which the output shaft and the differential device are parallel to a vehicle width direction, the power transmission path includes a projecting portion which is extended to project from the casing to outside, and the electromagnetic retarder generates the braking force between the projecting portion and the casing. ### Claim 2 (depends on 1) The electric vehicle according to claim 1, wherein the projecting portion is provided as one end portion of the output shaft, and the electromagnetic retarder is provided between the projecting portion of the output shaft and the casing and applies the braking force to the output shaft. ### Claim 3 (depends on 1) The electric vehicle according to claim 1, wherein the speed reducing mechanism includes a speed reduction shaft which is disposed parallel to the output shaft and which a rotation of the output shaft is reduced and transmitted to, and the speed reducing mechanism further reduces and transmits a rotation of the speed reduction shaft to the differential device, the projecting portion is provided as one end portion of the speed reduction shaft, and the electromagnetic retarder is provided between the projecting portion of the speed reduction shaft and the casing and applies the braking force to the speed reduction shaft. ### Claim 4 (depends on 1) The electric vehicle according to claim 1, comprising a brake control device determining whether a regenerative control of the rotating machine is available and controlling the rotating machine and the electromagnetic retarder such that the rotating machine generates the regenerative brake force when the regenerative control is available and that the electromagnetic retarder generates the braking force when the regenerative control is unavailable. ### Claim 5 (depends on 2) The electric vehicle according to claim 2, comprising a brake control device determining whether a regenerative control of the rotating machine is available and controlling the rotating machine and the electromagnetic retarder such that the rotating machine generates the regenerative brake force when the regenerative control is available and that the electromagnetic retarder generates the braking force when the regenerative control is unavailable. ### Claim 6 (depends on 3) The electric vehicle according to claim 3, comprising a brake control device determining whether a regenerative control of the rotating machine is available and controlling the rotating machine and the electromagnetic retarder such that the rotating machine generates the regenerative brake force when the regenerative control is available and that the electromagnetic retarder generates the braking force when the regenerative control is unavailable. ### Claim 7 (depends on 1) The electric vehicle according to claim 1, wherein the electromagnetic retarder includes a cylindrical rotating-side member relatively non-rotatably coupled to the projecting portion, and a cylindrical fixed-side member disposed on the inner circumferential side of the rotating-side member and fixed to the casing, a rotation of the rotating-side member is braked due to the electromagnetic induction action, and an outer circumferential surface of the rotating-side member is provided with a multiplicity of cooling fins projecting to an outer circumferential side of the rotating-side member.