Axial motor, powertrain, and electric device

Patent metadata

Field	Value
Publication number	US-12494686-B2
Application number	US-202318474711-A
Country	US
Kind code	B2
Filing date	Sep 26, 2023
Priority date	Sep 27, 2022
Publication date	Dec 9, 2025
Grant date	Dec 9, 2025

Abstract

An axial flux motor includes a motor shaft, a double-row angular contact ball bearing, and a stator. The double-row angular contact ball bearing is sleeved on the motor shaft and is fixedly connected to the motor shaft through a bearing inner ring of the double-row angular contact ball bearing. The stator is sleeved on the motor shaft through the double-row angular contact ball bearing, and the stator is fixedly connected to a bearing outer ring, so that the motor shaft can rotate relative to the stator. In this application, the double-row angular contact ball bearing is used in the axial motor, the double-row angular contact ball bearing can bear axial force generated through interaction between the stator and a rotor.

First claim

What is claimed is:

1 . An axial flux motor, comprising:
a motor shaft comprising:
a first motor half shaft configured to mount a first rotor; and
a second motor half shaft configured to mount a second rotor, wherein the first motor half shaft and the second motor half shaft are arranged in an axial direction of the motor shaft, and wherein the first motor half shaft is detachably connected to the second motor half shaft;
a double-row angular contact ball bearing, wherein the double-row angular contact ball bearing comprises a bearing inner ring and a bearing outer ring that are rotatably connected, wherein the double-row angular contact ball bearing is sleeved on the motor shaft, and wherein the bearing inner ring is fixedly connected to the motor shaft; and a stator sleeved on the motor shaft through the double-row angular contact ball bearing, wherein the stator is fixedly connected to the bearing outer ring such that the motor shaft can rotate relative to the stator, and wherein the first motor half shaft is configured to mount the double-row angular contact ball bearing.

2 . The axial flux motor of claim 1 , wherein the double-row angular contact ball bearing in the axial direction of the motor shaft has a first dimension, wherein the stator in the axial direction of the motor shaft has a second dimension, and wherein the first dimension is smaller than the second dimension.

3 . The axial flux motor of claim 1 , wherein the first motor half shaft comprises an end plane that faces the second motor half shaft, wherein the end plane comprises a fastening groove curved in a direction away from the second motor half shaft, wherein the second motor half shaft comprises a fastening hole that penetrates the second motor half shaft in the axial direction of the motor shaft, and wherein the axial flux motor further comprises a fastener that passes through the fastening hole and the fastening groove in order to detachably connect the first motor half shaft to the second motor half shaft.

4 . The axial flux motor of claim 1 , wherein the second motor half shaft comprises:
an end plane that faces the first motor half shaft; and a first positioning groove curved in a direction away from the first motor half shaft, wherein the first motor half shaft comprises:
a first half shaft body comprising a first end; and
a first frustum located at the first end and facing the second motor half shaft, wherein the first frustum is located in the first positioning groove and is in interference fit with a groove wall of the first positioning groove.

5 . The axial flux motor of claim 1 , wherein the first motor half shaft comprises:
a first half shaft body comprising a first rotor mounting position to mount the first rotor, wherein the double-row angular contact ball bearing is sleeved on the first half shaft body; and a first shaft shoulder located on an outer periphery of the first half shaft body, wherein the first shaft shoulder fastens the first rotor, and wherein in the axial direction of the motor shaft, the first shaft shoulder and the first rotor mounting position are located on a side that is of the double-row angular contact ball bearing and that is away from the second motor half shaft.

6 . The axial flux motor of claim 5 , wherein the second motor half shaft comprises a first end that faces the double-row angular contact ball bearing, wherein a diameter of the first end is larger than a diameter of a first half shaft body end that faces the second motor half shaft, wherein the outer periphery of the first half shaft body is further comprising an axial positioning part, and wherein two ends that are of the bearing inner ring and that are located in the axial direction of the motor shaft respectively abut against the second motor half shaft and the axial positioning part.

7 . The axial flux motor of claim 1 , wherein the axial flux motor further comprises the first rotor that is sleeved on the motor shaft and is fixedly connected to the motor shaft, wherein a surface of the first rotor and away from the stator has a first rotor groove curved in a direction facing the stator, and wherein the motor shaft passes through the first rotor groove.

8 . The axial flux motor of claim 7 , wherein the axial flux motor further comprises a first end cover and a first end cover bearing, wherein the first end cover is rotatably connected to the motor shaft through the first end cover bearing, and wherein a part of the first end cover bearing is located in the first rotor groove.

9 . A powertrain, comprising:
an axial flux motor, comprising:
a motor shaft comprising:
a first motor half shaft for mounting a first rotor; and
a second motor half shaft for mounting a second rotor, wherein the first motor half shaft and the second motor half shaft are arranged in an axial direction of the motor shaft, and wherein the first motor half shaft is detachably connected to the second motor half shaft;

a double-row angular contact ball bearing, wherein the double-row angular contact ball bearing comprises a bearing inner ring and a bearing outer ring that are rotatably connected, wherein the double-row angular contact ball bearing is sleeved on the motor shaft, and wherein the bearing inner ring is fixedly connected to the motor shaft; and
a stator sleeved on the motor shaft through the double-row angular contact ball bearing, wherein the stator is fixedly connected to the bearing outer ring such that the motor shaft can rotate relative to the stator; and
a gearbox comprising a power input shaft transmittingly connected to the axial flux motor, wherein the axial flux motor is configured to output power to the power input shaft, and wherein the first motor half shaft is for mounting the double-row angular contact ball bearing.

10 . An electric device, comprising:
a powertrain, comprising:
an axial flux motor, comprising:
a motor shaft comprising:
a first motor half shaft configured to mount a first rotor; and
a second motor half shaft configured to mount a second rotor, wherein the first motor half shaft and the second motor half shaft are arranged in an axial direction of the motor shaft, and wherein the first motor half shaft is detachably connected to the second motor half shaft;

a double-row angular contact ball bearing, wherein the double-row angular contact ball bearing comprises a bearing inner ring and a bearing outer ring that are rotatably connected, wherein the double-row angular contact ball bearing is sleeved on the motor shaft, and wherein the bearing inner ring is fixedly connected to the motor shaft; and
a stator sleeved on the motor shaft through the double-row angular contact ball bearing, wherein the stator is fixedly connected to the bearing outer ring such that the motor shaft can rotate relative to the stator; and

a gearbox comprising a power input shaft transmittingly connected to the axial flux motor, and wherein the axial flux motor is configured to output power to the power input shaft; and
a device body, wherein the powertrain is mounted on the device body, and wherein the first motor half shaft is configured to mount the double-row angular contact ball bearing.

11 . The axial flux motor of claim 1 , wherein the first motor half shaft comprises:
an end plane that faces the second motor half shaft; and a second positioning groove curved in a direction away from the second motor half shaft, wherein the second motor half shaft comprises:
a second half shaft body comprising a second end; and
a second frustum is located at the second end and faces the first motor half shaft, wherein the second frustum is located in the second positioning groove and

Assignees

• Huawei Digital Power Tech Co Ltd

Inventors

• Hou Jining
• Shi Chaojie
• Lan Hua

Classifications

• H02K16/02

  Machines with one stator and two {or more} rotors · CPC title

• H02K7/086

  radially supporting the rotor around a fixed spindle; radially supporting the rotor directly (H02K7/09 takes precedence) · CPC title

• H02K7/003

  Couplings; Details of shafts (means for mounting rotors on shafts H02K1/28) · CPC title

• H02K2205/03

  Machines characterised by thrust bearings · CPC title

• H02K5/1732

  radially supporting the rotary shaft at both ends of the rotor (H02K5/1737 takes precedence) · CPC title