Electric drive assembly

Abstract

The utility model provides an electric drive assembly. The electric drive assembly comprises a shell, a plurality of conductive fiber devices and a motor shaft. A cavity is defined by the shell, and a through hole communicated with the cavity is formed in the shell. The motor shaft is located in the cavity, and the end of the motor shaft penetrates out of the through hole. The shell is further provided with a plurality of installation grooves, and the installation grooves surround the periphery of the end of the motor shaft. The conductive fiber device comprises a conductive fiber part and a fixing part fixed with the conductive fiber part. The plurality of fixing parts are respectively mounted in the plurality of mounting grooves, and the plurality of conductive fiber parts are in contact with the motor shaft. The shell is provided with the installation groove, the fixing part of the conductive fiber device is installed in the installation groove, compared with the structure that the conductive fiber part and the installation ring are fixed, and the installation ring and the shell are fixed, the structure omits the installation ring, the structure is simpler, the assembling procedure is saved, and the assembling efficiency of the electric drive assembly is improved.

Description

Technical Field

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

[0002] With the growth of the new energy market, the sales volume of electric drive system assemblies is also increasing. During the operation of the electric drive assembly, shaft current will be generated at the motor shaft, which will cause electrical corrosion to the motor bearings, thus seriously affecting the service life of the motor bearings. Therefore, relevant measures need to be taken to eliminate or reduce the shaft current to avoid electrical corrosion of the bearings.

[0003] In order to solve the problem caused by shaft current, the existing electric drive assembly is first installed on the fixing ring through the conductive brush, and then the fixing ring is installed on the housing of the electric drive assembly. Not only is the structure complicated, but also there are many assembly steps, which reduces the assembly efficiency. Utility Model Content

[0004] The purpose of the present application is to provide an electric drive assembly with a simple structure.

[0005] The present application provides an electric drive assembly, comprising: a shell, a plurality of conductive fiber devices and a motor shaft; the shell is arranged to form a cavity, a through hole communicating with the cavity is arranged on the shell, the motor shaft is located in the cavity and an end portion thereof passes through the through hole; the shell is further provided with a plurality of mounting grooves, the plurality of mounting grooves surrounding the periphery of the end portion of the motor shaft; the conductive fiber device comprises a conductive fiber portion and a fixing portion fixed to the conductive fiber portion, the plurality of fixing portions are respectively installed in the plurality of mounting grooves, and the plurality of conductive fiber portions are in contact with the motor shaft.

[0006] Furthermore, the fixing portion is injection molded on the conductive fiber portion.

[0007] Further, the mounting groove includes a first mounting groove and a second mounting groove connected to the first mounting groove, the shell includes a pair of shoulders, and the pair of shoulders are respectively located on opposite sides of the second mounting groove, the fixing part includes a first fixing part and a second fixing part connected to the first fixing part, the first fixing part is accommodated in the first mounting groove, and the second fixing part is accommodated in the second mounting groove, and along the radial direction of the motor shaft, the shoulder is abutted against the first fixing part.

[0008] Furthermore, the electric drive assembly includes a baffle fixed to the housing; along the axial direction of the motor shaft, the baffle is located outside the fixing portion to limit the fixing portion.

[0009] Furthermore, the baffle includes a main body and a plurality of protrusions disposed on the main body, and the plurality of protrusions are respectively received in the plurality of mounting grooves.

[0010] Furthermore, the fixing portion, the mounting groove and the protrusion are all T-shaped.

[0011] Furthermore, the baffle and the shell are fixed by a fixing member.

[0012] Furthermore, the fixing portion and the baffle are both detachably connected to the shell.

[0013] Furthermore, the baffle is made of a conductive material and is electrically connected to the conductive fiber portion.

[0014] Furthermore, along the circumferential direction of the motor shaft, at least two of the conductive fiber portions have different thicknesses.

[0015] The shell of the electric drive assembly provided in the present application is provided with a mounting groove, and the fixing part of the conductive fiber device is installed in the mounting groove. Compared with the structure in which the conductive fiber part is fixed to the mounting ring and the mounting ring is fixed to the shell, the mounting ring is omitted, which not only makes the structure simpler, but also saves assembly steps, thereby improving the assembly efficiency of the electric drive assembly.

[0016] It is to be understood that the foregoing general description and the following detailed description are exemplary and explanatory only and are not restrictive of the present specification. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the specification and, together with the description, serve to explain the principles of the specification.

[0018] Figure 1 It is a schematic diagram of the electric drive assembly of the present application, in which only a part of the housing is shown.

[0019] Figure 2 yes Figure 1 A schematic diagram of a housing after being fixed to a conductive fiber device is shown.

[0020] Figure 3 yes Figure 2 An enlarged view of the circled portion at A of the housing is shown.

[0021] Figure 4 yes Figure 1 Schematic diagram of the conductive fiber device shown.

[0022] Figure 5 yes Figure 1 A schematic diagram of an electric drive assembly is shown, wherein the motor shaft is not shown.

[0023] Figure 6 yes Figure 5 An enlarged view of the circled portion at B of the electric drive assembly is shown.

[0024] Figure 7 yes Figure 5 Schematic diagram of the baffle shown.

[0025] Figure 8 yes Figure 6 Schematic diagram of the conductive fiber device before demolding.

[0026] Fig. 9 yes Figure 8 A schematic diagram of an injection mold is shown, wherein only a portion of the injection mold is shown.

[0027] Explanation of the reference numerals: 1. Shell; 11. Through hole; 12. Mounting slot; 121. First mounting slot; 122. Second mounting slot; 13. Shoulder; 2. Conductive fiber device; 21. Fixing portion; 211. First fixing portion; 212. Second fixing portion; 22. Conductive fiber portion; 3. Motor shaft; 4. Baffle; 41. Main body; 42. Bump; 5. Injection mold; 501. Injection cavity; 502. Opening; 503. Glue filling hole; 50. First mold; 51. Second mold. DETAILED DESCRIPTION

[0028] Next, the embodiments of this specification are described in detail.

[0029] 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.

[0030] 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.

[0031] Please refer to Figures 1 to 3As shown, the present application provides an electric drive assembly, including: a housing 1, a plurality of conductive fiber devices 2 and a motor shaft 3. The housing 1 is surrounded by a cavity (not shown) and is provided with a through hole 11 connected to the cavity, and the motor shaft 3 is located in the cavity and its end passes through the through hole 11. The housing 1 is also provided with a plurality of mounting grooves 12, and the plurality of mounting grooves 12 surround the periphery of the end of the motor shaft 3. The conductive fiber device 2 includes a conductive fiber portion 22 and a fixing portion 21 fixed to the conductive fiber portion 22, and the plurality of fixing portions 21 are respectively installed in the plurality of mounting grooves 12, and the plurality of conductive fiber portions 22 are in contact with the motor shaft 3.

[0032] The housing 1 of the electric drive assembly provided in the present application is provided with a mounting groove 12, and the fixing portion 21 of the conductive fiber device 2 is installed in the mounting groove 12. Compared with the structure in which the conductive fiber portion 22 is fixed to the mounting ring and the mounting ring is fixed to the housing 1, the mounting ring is omitted, which not only makes the structure simpler, but also saves assembly steps, thereby improving the assembly efficiency of the electric drive assembly.

[0033] In some embodiments, the housing 1 is injection molded to facilitate molding of the mounting groove 12 .

[0034] Please refer to Figure 3 to Figure 4 As shown, in some embodiments, the mounting groove 12 is T-shaped, and the mounting groove 12 includes a first mounting groove 121 and a second mounting groove 122 connected to the first mounting groove 121. The housing 1 includes a pair of shoulders 13, and the pair of shoulders 13 are respectively located on opposite sides of the second mounting groove 122. The fixing portion 21 is T-shaped and is detachably connected to the mounting groove 12. The fixing portion 21 includes a first fixing portion 211 and a second fixing portion 212 connected to the first fixing portion 211. The first fixing portion 211 is received in the first mounting groove 121, and the second fixing portion 212 is received in the second mounting groove 122. Along the radial direction of the motor shaft 3, the shoulder 13 abuts against the first fixing portion 211 to prevent the conductive fiber device 2 from falling off from the housing 1 along the radial direction of the motor shaft 3.

[0035] In some embodiments, the fixing portion 21 may also be in a square, diamond, triangle, etc., and the present application does not limit the shape of the fixing portion 21.

[0036] In some embodiments, the fixing portion 21 may be interference fit with the housing 1 to fix the conductive fiber device 2; the conductive fiber device 2 may also be fixed to the housing 1 by welding or bonding.

[0037] In some embodiments, the fixing portion 21 is electrically connected to the conductive fiber portion 22 . The fixing portion 21 may be made of a conductive material, or may be made of a non-conductive material and have a conductive layer electroplated on the surface to be electrically connected to the conductive fiber portion 22 .

[0038] In some embodiments, the fixing portion 21 may also be non-conductive, and may be electrically connected to the conductive fiber portion 22 via other conductive members to achieve the discharge of the shaft current.

[0039] Please refer to Figures 5 to 7 As shown, in some embodiments, the electric drive assembly further includes a baffle 4 fixed to the housing 1. Along the axial direction of the motor shaft 3, the baffle 4 is located outside the fixing portion 21 to limit the fixing portion 21.

[0040] When the conductive fiber device 2 is installed on the housing 1 , the fixing portion 21 is installed in the installation groove 12 along the axial direction of the motor shaft 3 , and then the baffle 4 is fixed to the housing 1 to limit the conductive fiber device 2 in the axial direction of the motor shaft 3 .

[0041] The baffle 4 can be connected to the housing 1 by interference connection, conductive metal adhesive bonding, screw connection, riveting, etc.

[0042] In one embodiment, the baffle 4 is detachably connected to the housing 1 via a fixing member (not shown), and the fixing member may be a bolt to facilitate the removal of the baffle 4 from the housing 1 .

[0043] In one embodiment, one or more baffles 4 may be provided. When a plurality of baffles 4 are provided, the plurality of baffles 4 are respectively fixed to the housing 1, thereby limiting the plurality of fixing portions 21. The number of baffles 4 may be less than the number of conductive fiber devices 2, or may be equal to the number of conductive fiber devices 2, and the present application does not limit this.

[0044] In some embodiments, the baffle 4 includes a main body 41 and a plurality of protrusions 42 disposed on the main body 41. The protrusions 42 are T-shaped, and the plurality of protrusions 42 are respectively received in the plurality of mounting grooves 12, thereby limiting the conductive fiber device 2 and improving the stability of the baffle 4 after being fixed to the housing 1.

[0045] In this embodiment, the baffle 4 may not be provided with a protrusion, and the main body 41 is located outside the fixing portion 21 and abuts against the fixing portion 21 to prevent the conductive fiber device 2 from shaking.

[0046] In this embodiment, the baffle 4 is made of a conductive material, and is electrically connected to the conductive fiber portion 22 , so as to discharge the axial current conducted by the conductive fiber portion 22 .

[0047] In this embodiment, the baffle 4 may also be made of a non-conductive material, and the surface of the baffle 4 may be electroplated with a conductive material.

[0048] In some embodiments, along the circumferential direction of the motor shaft 3 , the thickness of the conductive fiber portions 22 of all the conductive fiber devices 2 are the same.

[0049] In some embodiments, along the circumferential direction of the motor shaft 3 , at least two conductive fiber portions 22 have different thicknesses, so that a suitable conductive fiber device 2 can be selected according to the size and thickness of different motor shafts 3 , making assembly more flexible.

[0050] Please refer to the picture Figures 8 to 9 As shown, in some embodiments, the fixing portion 21 is injection molded on the conductive fiber portion 22 , which not only simplifies the molding method and reduces the cost, but also increases the stability between the fixing portion 21 and the conductive fiber portion 22 .

[0051] The conductive fiber portion 22 is composed of a plurality of conductive fibers. The fixed portion 21 is injection molded on the conductive fiber portion 22, which can solve the problem that the conductive fiber itself is relatively soft and it is difficult to directly install the conductive fiber on the fixed portion 21 by plugging. At the same time, the fixed portion 21 is directly injection molded on the conductive fiber portion 22, and the thickness of the conductive fiber portion 22 can be adjusted at any time before injection molding to adjust the conductive performance of the conductive fiber device 2, so that a suitable conductive fiber device 2 can be selected according to the size and thickness of different motor shafts 3, and the assembly is more flexible.

[0052] In some embodiments, the fixing portion 21 may also be assembled and fixed with the conductive fiber portion 22 .

[0053] In some embodiments, the injection mold 5 includes a first mold 50 and a second mold 51 .

[0054] The first mold 50 and the second mold 51 form an injection cavity 501 and an opening 502 communicating with the injection cavity 501. The first mold 50 and / or the second mold 51 are further provided with a glue injection hole 503.

[0055] In some embodiments, the opening 502 and the injection hole 503 are located on the same side of the injection mold 5 .

[0056] When the injection mold 5 is used, the first mold 50 and the second mold 51 are molded together and placed on a plane, with the opening 502 facing upward, and one end of the multiple conductive fiber parts 22 is inserted into the injection cavity 501 of the injection mold 5 through the opening 502. The injection material is poured into the injection cavity 501 through the injection hole 503. After the injection material solidifies, the fixed part 21 is formed, and the first mold 50 and the second mold 51 can be removed from the fixed part 21.

[0057] In some implementations, the thickness of the conductive fiber portion 22 can be adjusted by adjusting the area of ​​the opening 502 .

[0058] In some embodiments, the fixing portion 21 may be plated with a conductive material to be electrically connected to the conductive fiber portion 22 .

[0059] 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: A shell, a plurality of conductive fiber devices and a motor shaft; the shell is surrounded by a cavity, a through hole connected to the cavity is arranged on the shell, the motor shaft is located in the cavity and an end portion thereof passes through the through hole; the shell is also provided with a plurality of mounting grooves, the plurality of mounting grooves surround the periphery of the end portion of the motor shaft; the conductive fiber device comprises a conductive fiber portion and a fixing portion fixed to the conductive fiber portion, the plurality of fixing portions are respectively installed in the plurality of mounting grooves, and the plurality of conductive fiber portions are in contact with the motor shaft.

2. The electric drive assembly according to claim 1, characterized in that: The fixing portion is injection-molded on the conductive fiber portion.

3. The electric drive assembly according to claim 2, characterized in that: The mounting groove includes a first mounting groove and a second mounting groove connected to the first mounting groove, the shell includes a pair of shoulders, and the pair of shoulders are respectively located on opposite sides of the second mounting groove, the fixing part includes a first fixing part and a second fixing part connected to the first fixing part, the first fixing part is accommodated in the first mounting groove, and the second fixing part is accommodated in the second mounting groove, and along the radial direction of the motor shaft, the shoulder abuts against the first fixing part.

4. The electric drive assembly according to claim 1, characterized in that: The electric drive assembly includes a baffle fixed to the housing; along the axial direction of the motor shaft, the baffle is located outside the fixing portion to limit the fixing portion.

5. The electric drive assembly according to claim 4, characterized in that: The baffle includes a main body and a plurality of protrusions arranged on the main body, and the plurality of protrusions are respectively received in the plurality of mounting grooves.

6. The electric drive assembly according to claim 5, characterized in that: The fixing portion, the mounting groove and the protrusion are all T-shaped.

7. The electric drive assembly according to claim 4, characterized in that: The baffle and the shell are fixed by a fixing member.

8. The electric drive assembly according to claim 7, characterized in that: The fixing portion and the baffle are both detachably connected to the shell.

9. The electric drive assembly according to claim 4, characterized in that: The baffle is made of a conductive material and is electrically connected to the conductive fiber portion.

10. The electric drive assembly according to any one of claims 1 to 9, characterized in that: Along the circumferential direction of the motor shaft, at least two of the conductive fiber portions have different thicknesses.

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