Electric drive assembly and vehicle

Abstract

The utility model provides an electric drive assembly and a vehicle. The electric drive assembly comprises a motor and a rotary transformer. The motor comprises a shell and a motor shaft, a containing cavity and a through hole communicated with the containing cavity are defined by the shell, the motor shaft is located in the containing cavity, and the end of the motor shaft penetrates out of the through hole. The shell further comprises a pair of first limiting parts, and the pair of first limiting parts are located on the outer side of the through hole in the radial direction. The rotary transformer comprises a stator fixed on the shell, and the stator comprises a fixed part and a second limiting part fixed with the fixed part. The fixing part is arranged on the circumferential side of the end part in a surrounding mode, the second limiting part is located between the pair of first limiting parts, and the pair of first limiting parts can abut against the second limiting part so as to prevent the stator from rotating in the circumferential direction of the through hole. According to the electric drive assembly, the stator is fully limited by arranging the first limiting part on the shell, so that the stator is prevented from rotating in the circumferential direction of the through hole when the electric drive assembly works.

Description

Technical Field

[0001] The present application relates to the field of electric drive assemblies, and in particular to electric drive assemblies and vehicles. Background Art

[0002] The motor of the electric drive assembly usually uses a rotary transformer to collect the angular displacement and angular velocity of the motor in order to achieve high-precision control of the motor speed, torque, etc. Due to its high reliability and low cost, the rotary transformer is widely used to detect the rotor position of the motor and provide speed feedback. During the operation of the motor, the stator of the rotary transformer needs to be effectively fixed. Once it rotates circumferentially, the motor speed will be out of control due to the wrong rotor position feedback. Utility Model Content

[0003] The present application provides an electric drive assembly and a vehicle capable of preventing the stator of a rotary transformer from rotating circumferentially.

[0004] An embodiment of the present application provides an electric drive assembly, including: a motor and a rotary transformer, the motor including a shell and a motor shaft, the shell enclosing a receiving cavity and a through hole communicating with the receiving cavity, the motor shaft being located in the receiving cavity and an end portion thereof passing through the through hole, the shell also including a pair of first limiting portions, the pair of first limiting portions being both located on the outside in the radial direction of the through hole; the rotary transformer including a stator fixed to the shell, the stator including a fixed portion and a second limiting portion fixed to the fixed portion, the fixed portion being arranged around the circumference of the end portion, the second limiting portion being located between the pair of first limiting portions, the pair of first limiting portions being able to abut against the second limiting portion to prevent the stator from rotating along the circumferential direction of the through hole.

[0005] Furthermore, the second limiting portion is clearance-matched with a pair of the first limiting portions.

[0006] Furthermore, the shell is provided with a first receiving groove, at least a part of the second limiting portion is received in the first receiving groove, a pair of the first limiting portions are respectively located on opposite sides of the first receiving groove, and the second limiting portion is gap-matched with the inner side wall of the first receiving groove.

[0007] Furthermore, a center line of the first receiving groove passes through a center axis of the motor shaft.

[0008] Furthermore, the fixing portion is circular, and the second limiting portion and the first receiving groove are square.

[0009] Furthermore, the shell is provided with a second receiving groove, and at least a part of the fixing portion is received in the second receiving groove.

[0010] Furthermore, the electric drive assembly includes a pressure plate fixed to the housing to fix the stator on the housing, and the fixing portion is located between the pressure plate and the housing.

[0011] Furthermore, the shell is provided with a first hole, the pressure plate is provided with a second hole, and the electric drive assembly includes a fixing member, which passes through the second hole, is assembled in the first hole, and is screwed and fixed to the shell.

[0012] Furthermore, the electric drive assembly includes a motor controller, the rotary transformer includes a connecting line connecting the stator and the motor controller, and the second limiting portion is covered on the outside of at least a portion of the connecting line.

[0013] An embodiment of the present application also provides a vehicle, comprising the above-mentioned electric drive assembly.

[0014] In some embodiments, a first limiting portion is provided on the housing of the above technical solution to limit the second limiting portion of the stator, thereby preventing the stator from rotating along the circumferential direction of the through hole when the electric drive assembly is working. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 is a top view of an electric drive assembly according to an exemplary embodiment of the present application.

[0016] Figure 2 yes Figure 1 The cross-sectional view of the electric drive assembly along line AA is shown, wherein only a portion of the electric drive assembly is shown.

[0017] Figure 3 yes Figure 1 The cross-sectional view of the electric drive assembly along line BB is shown, wherein only a portion of the electric drive assembly is shown.

[0018] Figure 4 yes Figure 1 Schematic diagram of the stator and connecting wire connection shown.

[0019] Figure 5 yes Figure 1 A perspective view of the housing of the electric motor is shown.

[0020] Figure 6 yes Figure 5 A partial enlarged view of the shell shown.

[0021] Explanation of the accompanying drawings: 1. Shell; 11. Receiving cavity; 12. Through hole; 13. First receiving groove; 14. Second receiving groove; 15. First hole; 2. Stator; 21. Fixing part; 22. Second limiting part; 3. First limiting part; 4. Motor shaft; 41. End; 5. Pressing plate; 6. Fixing piece; 7. Connecting wire. DETAILED DESCRIPTION

[0022] Here, the technical solutions in the embodiments (or "implementations") of the present application will be described clearly and completely in conjunction with the accompanying drawings. When the following description refers to the drawings, unless otherwise indicated, the same numbers in different drawings represent the same or similar elements.

[0023] If there are terms involving directional indications or positional relationships in the embodiments of the present application (such as up, down, left, right, front, back, inside, outside, top, bottom, center, vertical, horizontal, longitudinal, transverse, length, width, counterclockwise, clockwise, axial, radial, circumferential, etc.), such terms are only used to explain the relative positional relationship, movement, etc. between the components under a certain specific posture (as shown in the accompanying drawings); if the specific posture changes, the directional indication or positional relationship will also change accordingly. In addition, the terms "first", "second", etc. involved in the embodiments of the present application are only used for the purpose of convenience of description and cannot be understood as indicating or implying relative importance.

[0024] The embodiment of the present application provides a vehicle, including an electric drive assembly. The electric drive assembly is the core power system of the vehicle, which converts high voltage electricity into driving kinetic energy and transmits it to wheels to drive the vehicle.

[0025] The embodiment of the present application provides an electric drive assembly, including: a motor and a rotary transformer. The motor provides driving force for the vehicle. The rotary transformer is used to detect the angular displacement and angular velocity of the motor so as to achieve high-precision control of the motor's speed, torque, etc.

[0026] See also Figures 1 to 4 As shown, the motor includes a shell 1 and a motor shaft 4. The shell 1 encloses a receiving cavity 11 and a through hole 12 connected to the receiving cavity 11. The motor shaft 4 is located in the receiving cavity 11 and its end 41 passes through the through hole 12. The shell 1 also includes a pair of first limiting portions 3, and the pair of first limiting portions 3 are both located on the outside of the through hole 12 in the radial direction.

[0027] The rotary transformer includes a stator 2 fixed on the housing 1, the stator 2 includes a fixing portion 21 and a second limiting portion 22 fixed to the fixing portion 21, the fixing portion 21 is arranged around the circumference of the end portion 41, the second limiting portion 22 is located between a pair of first limiting portions 3, and the pair of first limiting portions 3 can be abutted against the second limiting portion 22 to prevent the stator 2 from rotating along the circumferential direction of the through hole 12.

[0028] By arranging two first limiting portions 3 on the motor housing 1, a second limiting portion 22 is fixed on the fixing portion 21 of the stator 2, and the second limiting portion 22 is located between the two first limiting portions 3, the stator 2 can be effectively prevented from circumferential rotation, the positioning accuracy and stability of the stator 2 can be improved, and the position feedback error of the rotor of the rotary transformer caused by the circumferential rotation of the stator 2 can be avoided, resulting in the motor speed being out of control or even running away, and endangering personal safety.

[0029] In some embodiments, more first limiting portions 3 , such as three or four, may be provided on the housing 1 to abut against the second limiting portions 22 on the stator 2 in multiple directions, thereby further limiting the stator 2 .

[0030] The second limiting portion 22 is gap-matched with a pair of first limiting portions 3. A gap is left between the second limiting portion 22 and the first limiting portion 3, which can reduce the wear when the two are in contact and extend the service life. At the same time, it can allow a certain adjustment space for the stator 2 during installation, which is conducive to the installation and fixation of the stator 2 and improves the overall installation convenience.

[0031] See also Figure 1 and Figures 5 and 6 As shown, the shell 1 is provided with a first receiving groove 13, at least part of the second limiting portion 22 is received in the first receiving groove 13, a pair of first limiting portions 3 are respectively located on opposite sides of the first receiving groove 13, and the second limiting portion 22 is gap-matched with the inner side wall of the first receiving groove 13.

[0032] In some embodiments, the first limiting portion 3 is located on both sides of the first receiving groove 13, including the inner side wall of the first receiving groove 13, which can play a bidirectional limiting role on the second limiting portion 22, preventing the stator 2 from rotating clockwise or counterclockwise, and further enhancing the limiting strength of the stator 2. The clearance fit between the second limiting portion 22 and the first receiving groove 13 can provide a certain installation adjustment space for the stator 2, which is conducive to the installation and positioning of the stator 2 and improves the overall installation convenience.

[0033] In some embodiments, the first limiting portion 3 may be a positioning pin, a positioning buckle, a limiting block, etc., which are disposed in the first receiving groove 13 .

[0034] In some embodiments, a positioning pin is disposed in the first receiving groove 13 , and a positioning hole is provided on the second limiting portion 22 . The positioning pin is received in the positioning hole, so as to achieve further positioning of the stator 2 .

[0035] The housing 1 is provided with a second receiving groove 14, and at least a portion of the fixing portion 21 is received in the second receiving groove 14, so as to increase the stability of the fixing portion 21.

[0036] In some embodiments, the center line of the first receiving groove 13 passes through the central axis of the motor shaft 4. This can ensure that the second limit portion 22 is accurately matched with the center position of the motor shaft 4, improve positioning accuracy, simplify the assembly process, reduce the workload of adjustment and correction, and improve assembly efficiency.

[0037] See also Figure 4 and Figure 5 As shown, the fixing portion 21 is circular, and the second limiting portion 22 and the first receiving groove 13 are square. The second limiting portion 22 and the first receiving groove 13 are designed in a square shape, which can better limit the circumferential rotation of the stator 2 and enhance the positioning accuracy of the stator 2. The combination of the circular and square structures of the stator 2 can simplify the assembly process and make it easier to achieve rapid positioning and precise limiting.

[0038] In some embodiments, the second limiting portion 22 and the first receiving groove 13 may also adopt other polygonal structures, such as a regular hexagon, to improve positioning stability.

[0039] The electric drive assembly includes a motor controller (not shown), and the rotary transformer includes a connecting line 7 connecting the stator 2 and the motor controller. The second limiting portion 22 is covered on the outside of at least part of the connecting line 7. The second limiting portion 22 is covered on the outside of the connecting line 7, which can protect the connecting line 7 and prevent the connecting line 7 from being damaged by the external environment. At the same time, the second limiting portion 22 can position and fix the connecting line 7 to prevent the connecting line 7 from being accidentally displaced or damaged during operation.

[0040] See also Figure 1 and Figure 6 As shown, the electric drive assembly includes a pressure plate 5 fixed to the housing 1 to fix the stator 2 on the housing 1. The fixing portion 21 is located between the pressure plate 5 and the housing 1. The friction between the pressure plate 5 and the stator 2 limits the rotation of the stator 2.

[0041] The shell 1 is provided with a first hole 15, the pressure plate 5 is provided with a second hole (not shown), and the electric drive assembly includes a fixing part 6. The fixing part 6 passes through the second hole and is assembled in the first hole 15 and is screwed and fixed to the shell 1. The screwing fixing method can withstand larger axial and radial loads, thereby improving the structural strength and reliability of the entire electric drive assembly. The use of a detachable fixing part 6 is conducive to later maintenance and replacement, thereby improving the maintainability of the product.

[0042] In some embodiments, expansion bolts or rivets are used as the fixing members 6 to achieve a reliable connection between the pressing plate 5 and the housing 1 .

[0043] It should be noted that the technical solutions or technical features described in the above embodiments can be combined or supplemented with each other without causing conflicts. The scope of protection of this application is not limited to the precise structures described in the above embodiments and shown in the drawings; all modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of this application should be included in the scope of protection of this application.

Claims

1. An electric drive assembly, characterized in that: include: The motor comprises a housing and a motor shaft, wherein the housing encloses a receiving cavity and a through hole communicating with the receiving cavity, the motor shaft is located in the receiving cavity and an end of the motor shaft passes through the through hole, and the housing further comprises a pair of first limiting portions, both of which are located on the outer side of the through hole in a radial direction; The rotary transformer comprises a stator fixed on the shell, the stator comprises a fixing portion and a second limiting portion fixed to the fixing portion, the fixing portion is arranged around the circumference of the end portion, the second limiting portion is located between a pair of the first limiting portions, and the pair of the first limiting portions can abut against the second limiting portion to prevent the stator from rotating along the circumferential direction of the through hole.

2. The electric drive assembly according to claim 1, characterized in that: The second limiting portion is loosely matched with a pair of the first limiting portions.

3. The electric drive assembly according to claim 2, characterized in that: The shell is provided with a first receiving groove, at least part of the second limiting portion is received in the first receiving groove, a pair of the first limiting portions are respectively located on opposite sides of the first receiving groove, and the second limiting portion is gap-matched with the inner side wall of the first receiving groove.

4. The electric drive assembly according to claim 3, characterized in that: The center line of the first receiving groove passes through the central axis of the motor shaft.

5. The electric drive assembly according to claim 3, characterized in that: The fixing portion is circular, and the second limiting portion and the first receiving groove are square.

6. The electric drive assembly according to claim 1, characterized in that: The housing is provided with a second receiving groove, and at least a portion of the fixing portion is received in the second receiving groove.

7. The electric drive assembly according to claim 6, characterized in that: The electric drive assembly includes a pressure plate fixed to the housing to fix the stator on the housing, and the fixing portion is located between the pressure plate and the housing.

8. The electric drive assembly according to claim 7, characterized in that: The shell is provided with a first hole, the pressure plate is provided with a second hole, and the electric drive assembly includes a fixing member, which passes through the second hole, is assembled in the first hole, and is screwed and fixed to the shell.

9. The electric drive assembly according to any one of claims 1 to 8, characterized in that: The electric drive assembly includes a motor controller, the rotary transformer includes a connecting line connecting the stator and the motor controller, and the second limiting portion is covered on the outside of at least a portion of the connecting line.

10. A vehicle, characterized in that: Comprising the electric drive assembly as described in any one of claims 1 to 9.

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