# US 12,179,570 B2 · Motor attachment structure for electric vehicle > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 12,179,570 B2 - Document ID: US12179570B2 - Status: Granted - Kind: B2 - Application number: 17/548,618 - Filed: 2021-12-13 - Published: 2022-06-23 - Granted: 2024-12-31 - Earliest claimed: 2020-12-17 - Assignees: Toyota Jidosha Kabushiki Kaisha - Applicants: Toyota Jidosha Kabushiki Kaisha - Inventors: Masashi Ikemura; Yukihiko Ideshio; Tetsuya Yamaguchi - Web page: https://patentgrep.com/patent/US12179570B2 ## CPC - B60K 1/00: Arrangement or mounting of electrical propulsion units (B60K7/00 takes precedence; arrangement or mounting of plural diverse prime-movers for mutual or common propulsion B60K6/00) - B60K 17/02: characterised by arrangement, location, or kind of clutch - B60K 17/08: of mechanical type - H02K 1/185: {to outer stators} - H02K 3/50: Fastening of winding heads, equalising connectors, or connections thereto - H02K 5/15: Mounting arrangements for bearing-shields or end plates - H02K 5/225: {Terminal boxes or connection arrangements (specially adapted for submersible motors H02K5/132)} - H02K 7/006: {Structural association of a motor or generator with the drive train of a motor vehicle} - H02K 7/085: {radially supporting the rotary shaft at only one end of the rotor (H02K7/086, H02K7/09 take precedence)} - H02K 7/108: with friction clutches - B60K 2001/001: {one motor mounted on a propulsion axle for rotating right and left wheels of this axle} - B60Y 2400/426: Hydrodynamic couplings, e.g. torque converters - H02K 2203/09: Machines characterised by wiring elements other than wires, e.g. bus rings, for connecting the winding terminations - Y02T 10/72: Electric energy management in electromobility - 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 - H02K: DYNAMO-ELECTRIC MACHINES (dynamo-electric relays H01H53/00; conversion of DC or AC input power into surge output power {H03K3/53}) - B60Y: INDEXING SCHEME RELATING TO ASPECTS CROSS-CUTTING VEHICLE TECHNOLOGY - Y02T: CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION ## Abstract A motor attachment structure for an electric vehicle includes: a motor generator including a tubular rotor configured to rotate together with a motor output shaft in an integrated manner, and a tubular stator placed radially outwardly from the rotor; a tubular bearing configured to rotatably support a rotating body rotating together with the motor output shaft in an integrated manner; a case in which the motor generator and the bearing are accommodated; and an attachment attached to the case. The attachment supports an outer peripheral surface of the bearing. ## Claims ### Claim 1 A motor attachment structure for an electric vehicle, the motor attachment structure comprising: a case configured to accommodate: a motor including a tubular rotor configured to rotate together with an output shaft in an integrated manner, and a tubular stator placed radially outwardly from the rotor when the stator is viewed from the output shaft; a tubular bearing configured to rotatably support the output shaft or a rotating body configured to rotate together with the output shaft in an integrated manner; and an attachment attached to the case, wherein the attachment includes: a main body portion having a plate shape and placed at a position facing the motor in a direction along a central axis of the output shaft; and a projecting portion projecting from the main body portion toward the motor, a through hole is provided on the main body portion, the through hole penetrating through the attachment in the direction along the central axis of the output shaft, the main body portion includes a first small-diameter portion and a first large-diameter portion, the first large-diameter portion having a diameter larger than the first small-diameter portion, the main body portion is formed with a first stepped surface that is a surface between the first large-diameter portion and the first small-diameter portion; an inner peripheral surface of the first large-diameter portion is configured to support an outer peripheral surface of the bearing, the first stepped surface is configured to support an end surface of the bearing, the projecting portion has a tubular shape and is placed such that a central axis of the projecting portion coincides with the central axis of the output shaft, the projecting portion includes a second small-diameter portion and a second large-diameter portion, the second large-diameter portion having a diameter larger than the second small-diameter portion, the projecting portion is formed with a second stepped surface that is a surface between the second large-diameter portion and the second small-diameter portion, an inner peripheral surface of the second large-diameter portion is configured to support an outer peripheral surface of the stator, the second stepped surface is configured to support a first end surface of the stator, and the first stepped surface and the second stepped surface face a same direction along the central axis of the output shaft. ### Claim 2 (depends on 1) The motor attachment structure according to claim 1, wherein: the case includes a terminal block to which a power supply line placed outside the case is connected; and the stator includes a bus bar via which a current is applied to the stator, and an intermediate bus bar via which the bus bar is connected to the terminal block. ### Claim 3 (depends on 2) The motor attachment structure according to claim 2, wherein the bus bar is connected to a second end surface of the stator which is opposite to the first end surface of the stator. ### Claim 4 (depends on 1) The motor attachment structure according to claim 1, further comprising: a connecting shaft placed adjacent to the output shaft in the direction along the central axis of the output shaft such that a central axis of the connecting shaft coincides with the central axis of the output shaft; and a clutch configured to switch between transmission and non-transmission of torque between the output shaft and the connecting shaft, wherein the clutch is integrally attached to the motor. ### Claim 5 (depends on 1) The motor attachment structure according to claim 1, wherein the first end surface of the stator is attached to the second stepped surface by a plurality of bolts, the plurality of bolts are configured to penetrate through the stator in the direction along the central axis of the output shaft.