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CN-224204843-U - Motor rotor assembly, motor and vehicle

CN224204843UCN 224204843 UCN224204843 UCN 224204843UCN-224204843-U

Abstract

The present disclosure provides a motor rotor subassembly, motor and vehicle, relates to motor technical field. The motor rotor assembly comprises a rotor shaft and a rotor core, wherein the rotor shaft comprises a main body part, a plurality of grains are formed in the periphery of the main body part, the rotor core is provided with a matching through hole, a plurality of ribs are formed in the hole wall of the matching through hole, the ribs are distributed at intervals along the circumferential direction of the matching through hole, the ribs are in interference fit with the peripheral surface of the main body part, part of materials of the rotor core are filled in the grains, and the width of each rib is at least twice greater than that of each grain. The assembly accuracy of the motor rotor assembly can be improved.

Inventors

  • WANG BINGYI
  • CHEN WENBIN

Assignees

  • 小米汽车科技有限公司

Dates

Publication Date
20260505
Application Date
20250519

Claims (12)

  1. 1. An electric motor rotor assembly, comprising: a rotor shaft (1) including a main body portion (11), the outer periphery of the main body portion (11) having a plurality of textures; The rotor core (2) is provided with a matching through hole, the hole wall of the matching through hole is provided with a plurality of ribs (21), the ribs (21) are distributed along the circumferential direction of the matching through hole at intervals, the ribs (21) are in interference fit with the outer circumferential surface of the main body part (11), part of materials of the rotor core (2) are filled in the grains, and the width of the ribs (21) is larger than at least twice the width of the grains.
  2. 2. An electric motor rotor assembly according to claim 1, wherein a partial region of the outer peripheral surface of the main body portion (11) extends between adjacent two of the ribs (21).
  3. 3. An electric motor rotor assembly according to claim 1, wherein a plurality of the grains are spaced apart along the circumference of the main body portion (11), the grains extending in the axial direction of the main body portion (11).
  4. 4. The electric motor rotor assembly according to claim 1, characterized in that the rotor shaft (1) further comprises a first end head portion (12) and a second end head portion (13), the first end head portion (12) and the second end head portion (13) being located at both ends of the main body portion (11) and being connected to the main body portion (11), respectively; The motor rotor assembly further comprises a fixing piece (3), wherein the fixing piece (3) is connected to the first end head portion (12) and the second end head portion (13) and used for clamping two ends of the rotor core (2).
  5. 5. An electric motor rotor assembly according to claim 4, characterized in that the radius of the main body portion (11) increases in sequence in a direction of the main body portion (11) away from the first end head portion (12).
  6. 6. The electric motor rotor assembly according to claim 5, characterized in that the fixture (3) comprises a fixing ring (31) and a compression ring (32); The fixed ring (31) is coaxially arranged at the second end head part (13), the compression ring (32) is in interference fit with the first end head part (12), and the rotor core (2) is clamped between the compression ring (32) and the fixed ring (31).
  7. 7. The electric motor rotor assembly according to claim 6, characterized in that it further comprises two balancing plates (4); Two balance plates (4) are sleeved on the main body part (11), one balance plate (4) is abutted between the rotor core (2) and the fixed ring (31), and the other balance plate (4) is abutted between the rotor core (2) and the compression ring (32).
  8. 8. An electric motor rotor assembly according to claim 1, characterized in that the rotor core (2) has at least one lightening hole (22), the lightening hole (22) penetrating the rotor core (2) in the axial direction of the rotor core (2).
  9. 9. An electric motor rotor assembly according to claim 1, characterized in that the rotor core (2) has at least one mounting hole (23) for mounting a magnet, the mounting hole (23) penetrating the rotor core (2) in the axial direction of the rotor core (2).
  10. 10. The electric motor rotor assembly according to any one of claims 1-9, wherein the rotor core (2) comprises a plurality of cores arranged in a stacked arrangement along the axial direction of the main body portion (11).
  11. 11. An electric machine comprising an electric machine rotor assembly according to any one of claims 1 to 10.
  12. 12. A vehicle comprising the electric machine of claim 11.

Description

Motor rotor assembly, motor and vehicle Technical Field The disclosure relates to the technical field of motors, in particular to a motor rotor assembly, a motor and a vehicle. Background An electric motor is a device for converting electric energy into mechanical energy, and its structure is composed of a rotor, a stator and other accessories. The working principle of the motor is to make the motor rotate by utilizing the action of the magnetic field on the current. The assembly accuracy of the existing motor rotor needs to be improved. It should be noted that the information disclosed in the above background section is only for enhancing understanding of the background of the present disclosure and thus may include information that does not constitute prior art known to those of ordinary skill in the art. Disclosure of Invention The present disclosure provides a motor rotor assembly, a motor and a vehicle, which can improve the assembly accuracy of the motor rotor assembly. According to a first aspect of the present disclosure, there is provided an electric machine rotor assembly comprising: The rotor shaft comprises a main body part, wherein the periphery of the main body part is provided with a plurality of grains; The rotor core is provided with a matching through hole, the hole wall of the matching through hole is provided with a plurality of ribs, the ribs are distributed along the circumferential direction of the matching through hole at intervals, the ribs are in interference fit with the outer circumferential surface of the main body part, part of materials of the rotor core are filled in the grains, and the width of each rib is at least twice greater than that of each grain. In one embodiment of the present disclosure, a partial region of the outer peripheral surface of the main body portion extends between two adjacent ribs. In one embodiment of the present disclosure, a plurality of the beads are spaced apart along a circumferential direction of the body portion, the beads extending along an axial direction of the body portion. In one embodiment of the present disclosure, the rotor shaft further includes a first end head portion and a second end head portion, which are located at both ends of the main body portion and are connected to the main body portion, respectively; The motor rotor assembly further comprises a fixing piece connected to the first end head portion and the second end head portion and used for clamping two ends of the rotor core. In one embodiment of the present disclosure, the radius of the body portion increases in sequence along a direction of the body portion away from the first end portion. In one embodiment of the present disclosure, the fixing member includes a fixing ring and a pressing ring; The fixed ring is coaxially arranged at the second end head part, the compression ring is in interference fit with the first end head part, and the rotor core is clamped between the compression ring and the fixed ring. In one embodiment of the present disclosure, the motor rotor assembly further comprises two balancing plates; The two balance plates are sleeved on the main body part, one balance plate is abutted between the rotor core and the fixed ring, and the other balance plate is abutted between the rotor core and the compression ring. In one embodiment of the present disclosure, the rotor core has at least one lightening hole penetrating the rotor core in an axial direction of the rotor core. In one embodiment of the present disclosure, the rotor core has at least one mounting hole for mounting a magnet, the mounting hole penetrating the rotor core in an axial direction of the rotor core. In one embodiment of the present disclosure, the rotor core includes a plurality of cores disposed in a stacked manner along an axial direction of the main body portion. According to a second aspect of the present disclosure, there is provided an electric machine comprising an electric machine rotor assembly according to any of the embodiments described above. According to a third aspect of the present disclosure, there is provided a vehicle including the motor of the above embodiment. The rotor shaft is provided with the lines, the protruding edges are in interference fit with the outer peripheral surface of the main body, part of materials of the rotor core are filled in the lines, the rotor shaft and the rotor core can be assembled without milling key grooves in the main body, the lines can be processed through knurling or thread rolling processes, the processing time of the rotor shaft is shortened, the processing efficiency of the rotor shaft is improved, and when the rotor shaft is subjected to heat treatment, compared with the rotor shaft with the key grooves, the rotor shaft with the processed lines has smaller deformation, so that the dimensional precision of the rotor shaft is improved, and the assembly precision of a motor rotor assembly and the overall performance of a motor are