Motor conductive connection structure, assembling method, motor and vehicle

Abstract

The invention relates to the technical field of motors, and particularly discloses a motor conductive connection structure, an assembly method, a motor and a vehicle, a second end is inserted into a shaft hole, then the second end is subjected to press riveting to form a riveting part, the riveting part is filled in a second hole section, and the inner diameter of at least part of the second hole section is larger than that of a first hole section, so that the motor conductive connection structure is formed. The core shaft can be prevented from moving in the direction of being pulled out of the shaft hole through the riveting part; the limiting part can abut against one end, deviating from the second hole section in the first direction, of the current collector, so that the mandrel can be prevented from moving in the direction of being inserted into the shaft hole; the core shaft is in interference fit with the first hole section, so that the core shaft and the current collector are fixed, the connection stability of the core shaft and the current collector can be improved, the performance of the motor is improved, the service life of the motor is prolonged, the assembling convenience of the core shaft and the current collector can be improved, and the motor has the advantages of reducing cost and increasing efficiency.

Description

Technical Field

[0001] This invention relates to the field of motor technology, and in particular to motor conductive connection structures, assembly methods, motors, and vehicles. Background Technology

[0002] In a locomotive generator, the motor rotor and the current collector are connected by a spindle. Specifically, one end of the spindle is electrically connected to the motor rotor, and the other end is plugged into the current collector.

[0003] In related technologies, the mandrel is plugged into the current collector and fixed by welding or threading. However, both of these fixing methods have drawbacks. For example, welding can easily lead to structural deformation, porosity, cracks, and internal corrosion, while threaded connections pose risks such as loosening, thread damage, and loss of dynamic balance. These defects can cause problems such as generator vibration, abnormal noise, and decreased conductivity, thereby increasing manufacturing and maintenance costs. Summary of the Invention

[0004] The purpose of this invention is to provide a conductive connection structure for an electric motor, an assembly method, an electric motor, and a vehicle, which can not only improve the performance of the electric motor but also reduce manufacturing and maintenance costs.

[0005] On one hand, the present invention provides a conductive connection structure for an electric motor, comprising:

[0006] A mandrel, the mandrel comprising a first end and a second end, the first end being provided with a limiting portion;

[0007] A current collector is provided with a shaft hole that extends through a first direction. The shaft hole includes a first hole segment and a second hole segment connected together. At least a portion of the inner diameter of the second hole segment is larger than the inner diameter of the first hole segment. The second end is inserted into the shaft hole and riveted to form a riveted part. The riveted part can fill the second hole segment. The mandrel is interference-fitted with the first hole segment. The limiting part can abut against one end of the current collector that is away from the second hole segment along the first direction.

[0008] As an optional solution for the conductive connection structure of the motor, the limiting part is a shaft shoulder.

[0009] As an alternative solution for the conductive connection structure of the motor, the second hole segment is a tapered hole, and the inner diameter of the tapered hole gradually decreases along the first direction from the riveting part to the limiting part.

[0010] As an alternative solution for the conductive connection structure of the motor, along the first direction, the end face of the riveting part away from the first end is flush with the end face of the current collector away from the limiting part.

[0011] As an alternative solution for the conductive connection structure of the motor, the current collector has grooves on both end faces along the first direction.

[0012] As an alternative solution for the conductive connection structure of the motor, the second end is provided with a first terminal.

[0013] As an optional solution for the electric motor conductive connection structure, the shaft hole is provided with three holes, which are arranged in an equilateral triangle.

[0014] The mandrel is provided in three parts, and the three mandrels are connected to the three shaft holes in a one-to-one correspondence.

[0015] On the other hand, the present invention provides an electric motor, including the electric motor conductive connection structure as described in any of the preceding claims.

[0016] On the other hand, the present invention provides a vehicle including the motor described above.

[0017] On the other hand, the present invention provides a method for assembling a motor conductive connection structure, which is applied to the motor conductive connection structure as described in any of the preceding claims;

[0018] The assembly method for the motor conductive connection structure includes the following steps:

[0019] The mandrel is frozen, or the current collector is heated;

[0020] Insert the second end into the shaft hole;

[0021] The limiting part is pressed against the end of the current collector that is away from the second hole segment along the first direction;

[0022] The mandrel or the current collector is brought back to room temperature so that the mandrel is interference-fitted with the first hole segment.

[0023] Position the current collector above the first end;

[0024] The first end is connected to the support structure, and the current collector is suspended in the air;

[0025] The second end is press-fitted to form the riveted portion that fills the second hole segment.

[0026] As an optional method for assembling the conductive connection structure of the motor, after inserting the second end into the shaft hole, the following steps are also included:

[0027] The second end extends from the end of the second hole segment that is away from the first hole segment;

[0028] After riveting the second end and forming the riveted portion filling the second hole segment, the following steps are also included:

[0029] The end face of the riveting part away from the first end along the first direction is processed so that the end face of the riveting part away from the first end along the first direction is flush with the end face of the current collector away from the limiting part.

[0030] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0031] The electric motor conductive connection structure, assembly method, electric motor, and vehicle of the present invention, by inserting the second end into the shaft hole and then riveting the second end to form a riveting part, and the riveting part filling the second hole segment, since at least part of the inner diameter of the second hole segment is larger than the inner diameter of the first hole segment, can prevent the mandrel from moving in the direction of its pull-out from the shaft hole through the riveting part; the limiting part can abut against the end of the current collector away from the second hole segment in the first direction, thereby preventing the mandrel from moving in the direction of its insertion into the shaft hole. That is to say, both the riveting part and the limiting part abut against the current collector in the first direction, and in the first direction, the force of the riveting part acting on the current collector is opposite to the force of the limiting part acting on the current collector, thereby fixing the mandrel and the current collector. This not only improves the connection stability between the mandrel and the current collector, thereby improving the performance and service life of the motor, but also improves the convenience of assembling the mandrel and the current collector, and has the advantages of cost reduction and efficiency improvement. Meanwhile, the interference fit between the spindle and the first hole section further improves the stability of the connection between the spindle and the current collector, so that the motor's conductive connection structure can still have extremely high anti-loosening ability and structural integrity under long-term high-speed operation of the motor, thus ensuring the stability of conductivity and the durability of dynamic balance. Attached Figure Description

[0032] Figure 1 This is a schematic diagram of the electric motor conductive connection structure and the rotor in an embodiment of the present invention;

[0033] Figure 2 This is a cross-sectional view of the motor conductive connection structure in an embodiment of the present invention;

[0034] Figure 3 This is an exploded view of the motor conductive connection structure in an embodiment of the present invention;

[0035] Figure 4 This is a schematic diagram of the current collector structure in an embodiment of the present invention;

[0036] Figure 5 This is a schematic diagram of the mandrel and shaft hole before riveting in an embodiment of the present invention;

[0037] Figure 6 This is a schematic diagram of the mandrel and shaft hole after riveting in an embodiment of the present invention;

[0038] Figure 7This is a flowchart of the assembly method of the motor conductive connection structure in an embodiment of the present invention;

[0039] Figure 8 This is a schematic diagram of the mandrel, current collector, and support structure before riveting in an embodiment of the present invention;

[0040] Figure 9 This is a cross-sectional view of the mandrel, current collector, and support structure before riveting in an embodiment of the present invention;

[0041] Figure 10 This is a schematic diagram of the mandrel, current collector, and support structure after riveting in an embodiment of the present invention;

[0042] Figure 11 This is a cross-sectional view of the mandrel, current collector, and support structure after riveting in an embodiment of the present invention.

[0043] In the picture:

[0044] 100. Rotor; 101. Main body; 102. Shaft; 200. Wire; 300. Support structure; 1. Mandrel; 11. First end; 12. Second end; 13. Limiting part; 14. Riveting part; 15. First terminal; 2. Current collector; 21. Shaft hole; 211. First hole section; 212. Second hole section; 22. Center hole; 23. Connecting groove; 24. Groove. Detailed Implementation

[0045] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. The components of the embodiments of the present invention described and shown in the accompanying drawings can generally be arranged and designed in various different configurations.

[0046] Therefore, the following detailed description of the embodiments of the invention provided in the accompanying drawings is not intended to limit the scope of the claimed invention, but merely to illustrate selected embodiments of the invention. All other embodiments obtained by those skilled in the art based on the embodiments of the invention without inventive effort are within the scope of protection of the invention.

[0047] It should be noted that similar labels and letters in the following figures indicate similar items. Therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures.

[0048] In the description of this invention, it should be noted that the terms "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship commonly used when the product of this invention is in use. They are used only for the convenience of describing the invention and for simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the invention. Furthermore, the terms "first," "second," and "third," etc., are used only to distinguish descriptions and should not be construed as indicating or implying relative importance. In the description of this invention, unless otherwise stated, "a plurality of" means two or more.

[0049] In the description of this invention, it should also be noted that, unless otherwise explicitly specified and limited, the terms "set" and "connection" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0050] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "over," and "on top" of the second feature includes the first feature directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature includes the first feature directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0051] Embodiments of the present invention are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and should not be construed as limiting the present invention.

[0052] like Figures 1 to 6As shown, this embodiment provides a motor conductive connection structure and a motor. The motor includes the motor conductive connection structure, which includes a spindle 1 and a current collector 2. The spindle 1 includes a first end 11 and a second end 12. The first end 11 is provided with a limiting part 13. The current collector 2 is provided with a shaft hole 21 that is provided through in a first direction. The shaft hole 21 includes a first hole segment 211 and a second hole segment 212 connected together. At least part of the inner diameter of the second hole segment 212 is larger than the inner diameter of the first hole segment 211. The second end 12 is inserted into the shaft hole 21 and a riveting part 14 is formed by pressing and riveting. The riveting part 14 can fill the second hole segment 212. The spindle 1 is interference-fitted with the first hole segment 211. The limiting part 13 can abut against the end of the current collector 2 that is away from the second hole segment 212 in the first direction.

[0053] In this embodiment of the motor conductive connection structure, the second end 12 is inserted into the shaft hole 21, and then the second end 12 is riveted to form a riveting part 14. The riveting part 14 fills the second hole segment 212. Since at least part of the inner diameter of the second hole segment 212 is larger than the inner diameter of the first hole segment 211, the riveting part 14 can prevent the spindle 1 from moving in the direction of its removal from the shaft hole 21. The limiting part 13 can abut against the end of the current collector 2 that is away from the second hole segment 212 in the first direction, thereby preventing the spindle 1 from moving in the direction of its removal from the shaft hole 212. The mandrel 1 moves in the direction of insertion into the shaft hole 21. That is, both the riveting part 14 and the limiting part 13 abut against the current collector 2 in the first direction. Furthermore, the force exerted by the riveting part 14 on the current collector 2 in the first direction is opposite to the force exerted by the limiting part 13 on the current collector 2, thereby fixing the mandrel 1 to the current collector 2. This not only improves the connection stability between the mandrel 1 and the current collector 2, thus improving the performance and service life of the motor, but also enhances the ease of assembly, offering the advantages of cost reduction and efficiency improvement. Simultaneously, the interference fit between the mandrel 1 and the first hole segment 211 further improves the connection stability between the mandrel 1 and the current collector 2. This ensures that even under long-term high-speed operation, the motor's conductive connection structure maintains extremely high resistance to loosening and structural integrity, thereby guaranteeing the stability of conductive performance and the durability of dynamic balance.

[0054] It is understood that in this embodiment, the motor conductive connection structure abuts against the end of the current collector 2 away from the second hole segment 212 along the first direction by the limiting part 13, the riveting part 14 fills the second hole segment 212, and the spindle 1 is interference-fitted with the first hole segment 211, thereby forming three fastening points, which can greatly improve the connection strength and reliability of the motor conductive connection structure.

[0055] Compared to existing technologies, the motor conductive connection structure of this embodiment eliminates the need for welding, solder, and grinding of the weld seam. This not only solves the problems caused by welding processes, such as deformation, porosity, cracks, and slag inclusions in the spindle 1 and current collector 2, as well as the resulting dynamic balance failure, internal corrosion of the shaft hole 21, and decreased conductivity, but also reduces costs and eliminates occupational health hazards and safety risks such as fumes and arc light. Furthermore, the elimination of the need for precision connection structure processing such as threads reduces the manufacturing cost of the spindle 1 and current collector 2 and improves the assembly efficiency of the motor.

[0056] It should be noted that the current collector 2 is rotatably disposed inside the motor housing. The first end 11 of the spindle 1 is used for electrical connection with the rotor 100 of the motor, and the current collector 2 is used for frictional contact with the carbon brush, thereby enabling current transmission between the rotor 100 and the stator of the motor. Specifically, the first direction is parallel to the axial direction of the motor, that is, the first direction is parallel to the axial direction of the rotor 100.

[0057] Specifically, the current collector 2 is also provided with a central hole 22 that runs through the first direction. The rotor 100 includes a main body 101 and a shaft 102. One end of the shaft 102 is connected to the main body 101, and the axis of the shaft 102 coincides with the axis of the main body 101. The other end of the shaft 102 is inserted into the central hole 22.

[0058] In some embodiments, the second end 12 is provided with a first terminal 15, which facilitates electrical connection between the first terminal 15 and the rotor 100 of the motor via electrical connectors such as wires 200, thereby improving the convenience of motor assembly and the stability of conductivity. Specifically, the main body 101 is provided with a second terminal, which is electrically connected to the first terminal 15 via wires 200.

[0059] In some embodiments, the outer peripheral surface of the current collector 2 is also provided with a connecting groove 23, and the carbon brush is located in the connecting groove 23. This not only improves the contact stability between the current collector 2 and the carbon brush to improve the stability of the conductivity, but also meets the heat dissipation requirements and promotes the autonomous discharge of grinding carbon powder to avoid carbon buildup.

[0060] In some embodiments, the connecting groove 23 is a spiral groove, which can improve the uniformity of force on the current collector 2 in the rotating state, ensure the stability and uniformity of the frictional contact between the current collector 2 and the carbon brush, and also extend the service life of the current collector 2 and the carbon brush.

[0061] In other embodiments, the connecting groove 23 may be omitted. Instead, a protrusion or a conductive wear-resistant layer may be provided on the outer peripheral surface of the current collector 2, and the carbon brush may be in frictional contact with the protrusion or conductive wear-resistant layer. This improves the contact stability between the current collector 2 and the carbon brush, thereby enhancing the stability of the conductivity. It should be noted that the conductive wear-resistant layer is made of a conductive wear-resistant material in the prior art. For example, conductive wear-resistant materials include graphene coatings, etc.

[0062] In some embodiments, three shaft holes 21 are provided, and the three shaft holes 21 are arranged in an equilateral triangle; three spindles 1 are provided, and the three spindles 1 are connected to the three shaft holes 21 in a one-to-one correspondence, thereby ensuring the dynamic balance of the current collector 2. Specifically, the three spindles 1 are respectively used to connect the U-phase circuit, the V-phase circuit, and the W-phase circuit.

[0063] In some embodiments, the limiting part 13 is a shoulder. It should be noted that the shoulder and the end of the current collector 2 away from the second hole segment 212 along the first direction abut against each other in the form of surface contact, and the contact surface of the two is an annular structure surrounding the outside of the shaft hole 21, thereby forming a seal to prevent moisture and other substances from entering the shaft hole 21 from the opening of the first hole segment 211, and to prevent corrosion inside the shaft hole 21. This can improve the service life and reliability of the motor conductive connection structure and greatly reduce maintenance costs.

[0064] It should be further explained that the outer peripheral wall of the riveting part 14 and the inner wall of the second hole section 212 are in surface contact, which can form a seal to prevent moisture and other substances from entering the shaft hole 21 through the opening of the second hole section 212, thus preventing the shaft hole 21 from rusting inside. This can improve the service life and reliability of the motor conductive connection structure and greatly reduce maintenance costs.

[0065] In some embodiments, the second hole segment 212 is a tapered hole. Along the first direction from the riveting part 14 to the limiting part 13, the inner diameter of the tapered hole gradually decreases, which not only increases the volume of the riveting part 14, but also increases the contact area between the riveting part 14 and the second hole segment 212, thereby further improving the connection stability of the mandrel 1 and the current collector 2, and improving the sealing effect.

[0066] In other embodiments, the first hole segment 211 and the second hole segment 212 can both be cylindrical holes, and the inner diameter of the second hole segment 212 is larger than the inner diameter of the first hole segment 211, which can also ensure the connection stability and sealing effect of the mandrel 1 and the current collector 2.

[0067] In some embodiments, along the first direction, the end face of the riveting portion 14 facing away from the first end 11 is flush with the end face of the current collector 2 facing away from the limiting portion 13, thereby improving the dynamic balance of the current collector 2.

[0068] Specifically, when the second end 12 is inserted into the shaft hole 21, the second end 12 passes through the shaft hole 21 and extends out of the outside of the shaft hole 21; then, the second end 12 is pressed and riveted to cause the second end 12 to undergo plastic deformation and form a riveting part 14. Then, the end face of the riveting part 14 away from the first end 11 along the first direction is processed by grinding and other processes so that the end face of the riveting part 14 away from the first end 11 along the first direction is flush with the end face of the current collector 2 away from the limiting part 13.

[0069] In some embodiments, the mandrel 1 is made of copper. Copper has good electrical conductivity and ductility, which not only improves the conductivity of the motor conductive connection structure, but also facilitates the formation of the riveted part 14 by press riveting, thereby improving the ease of assembly of the motor conductive connection structure.

[0070] In some embodiments, grooves 24 are provided on both end faces of the current collector 2 along the first direction, which can reduce the weight of the current collector 2 and improve the dynamic balance performance of the current collector 2.

[0071] This embodiment also provides a vehicle, including the motor described above. The vehicle of this embodiment, by applying the aforementioned motor, has corresponding functions and beneficial effects, which will not be elaborated further here.

[0072] like Figures 1 to 11 As shown, this embodiment also provides a method for assembling a motor conductive connection structure, applied to the motor conductive connection structure described above. The method for assembling the motor conductive connection structure includes the following steps:

[0073] S1. Freeze the mandrel 1.

[0074] S2. Insert the second end 12 into the shaft hole 21.

[0075] S3, make the limiting part 13 press against the end of the current collector 2 away from the second hole section 212 in the first direction.

[0076] S4. Allow the mandrel 1 to return to room temperature so that the mandrel 1 is interference-fitted with the first hole section 211.

[0077] S5. Position the current collector 2 above the first end 11, and suspend the current collector 2 in mid-air.

[0078] S6. The second end 12 is press-riveted to form a riveted portion 14 that fills the second hole section 212.

[0079] The assembly method of the motor conductive connection structure in this embodiment involves freezing the mandrel 1, which shrinks the mandrel 1 and reduces its outer diameter, thereby improving the ease of inserting the mandrel 1 into the shaft hole 21. Then, the limiting part 13 is pressed against the end of the current collector 2 that is away from the second hole segment 212 along the first direction to initially position the mandrel 1 along the first direction. After the mandrel 1 returns to room temperature, the mandrel 1 expands due to the thermal expansion and contraction of metals and is press-fitted with the first hole section 211 to achieve initial fastening between the mandrel 1 and the current collector 2. Then, the second end 12 is riveted to form a riveting part 14 that fills the second hole section 212. This causes the riveting part 14 and the limiting part 13 to press against the current collector 2 in the first direction. In the first direction, the force exerted by the riveting part 14 on the current collector 2 is opposite to the force exerted by the limiting part 13 on the current collector 2, thereby fixing the mandrel 1 and the current collector 2. This not only improves the connection stability between the mandrel 1 and the current collector 2, thereby improving the performance and service life of the motor, but also improves the ease of assembly of the mandrel 1 and the current collector 2, which has the advantages of cost reduction and efficiency improvement.

[0080] The motor conductive connection structure assembly method of this embodiment enables the spindle 1 and the current collector 2 to achieve interference fit without damage or stress, which not only ensures assembly accuracy but also ensures the performance of the base material, thereby improving the performance and service life of the motor.

[0081] For example, the mandrel 1 can be placed in a closed environment filled with liquid nitrogen to freeze the mandrel 1. Of course, other means in the prior art can also be used to freeze the mandrel 1, and are not limited thereto.

[0082] For example, when the second end 12 is riveted, the end face of the second end 12 can be repeatedly struck by a riveting component such as a hammer from the edge of the mandrel 1 to the center line of the mandrel 1 and then from the center line of the mandrel 1 to the edge of the mandrel 1, thereby causing the material of the second end 12 to undergo plastic deformation, thereby fully filling the second hole section 212 and forming a firm riveting connection.

[0083] Specifically, such as Figure 8 and Figure 9 As shown, when inserting the second end 12 into the shaft hole 21, the current collector 2 is first placed on the support structure 300, and then the second end 12 is inserted into the shaft hole 21, so that the support structure 300 provides stable support for the current collector 2. At this time, the first end 11 of the spindle 1 faces upward and the second end 12 faces downward, that is, the current collector 2 is located below the first end 11.

[0084] It should be noted that after the mandrel 1 is brought back to room temperature, the mandrel 1 and the first hole section 211 are press-fitted together, at which point the mandrel 1 and the current collector 2 are initially secured. When the mandrel 1 is riveted in subsequent steps, the mandrel 1 and the first hole section 211 may become loose.

[0085] Therefore, such as Figure 10 and Figure 11 As shown, after the mandrel 1 is brought back to room temperature, the first end 11 is positioned downwards and the second end 12 is positioned upwards. That is, the current collector 2 is located above the first end 11 and is suspended in mid-air. This allows the current collector 2 to abut against the limiting part 13 under the influence of gravity, thereby improving the stability of the connection between the mandrel 1 and the current collector 2. For example, when the current collector 2 is again positioned above the first end 11 and suspended in mid-air, the first end 11 can be connected to the support structure 300 to fix the first end 11, thus providing stable support for subsequent riveting operations.

[0086] Furthermore, three shaft holes 21 are provided, and the three shaft holes 21 are arranged in an equilateral triangle; three mandrels 1 are provided, and the three mandrels 1 are connected to the three shaft holes 21 in a one-to-one correspondence. Thus, when the current collector 2 is located above the first end 11, the current collector 2 can be stably supported by the three mandrels 1, which can improve the stability of the mandrels 1 and the current collector 2 during the riveting operation and is conducive to improving the riveting effect.

[0087] For example, the support structure 300 is a housing with an open top. Further, when the second end 12 is inserted into the shaft hole 21, the current collector 2 can be placed at the top of the housing, thereby supporting the current collector 2 through the housing. Further, after the spindle 1 returns to room temperature, the spindle 1 and the current collector 2 are rotated 180° as a whole, so that the current collector 2 is positioned above the first end 11, and the first ends 11 of all three spindles 1 are located inside the housing and abut against the bottom wall of the housing, thus stably supporting the current collector 2 and allowing it to be suspended in the air. This arrangement not only provides stable support for the current collector 2 and the spindle 1 through the housing, but also improves the ease of use of the housing, which is beneficial for improving the assembly efficiency of the motor's conductive connection structure.

[0088] In some embodiments, after inserting the second end 12 into the shaft hole 21, the following steps are further included:

[0089] The second end 12 extends from the end of the second hole section 212 that is away from the first hole section 211;

[0090] After pressing and riveting the second end 12 to form the riveted portion 14 filling the second hole section 212, the following steps are also included:

[0091] The end face of the riveting part 14 away from the first end 11 along the first direction is processed so that the end face of the riveting part 14 away from the first end 11 along the first direction is flush with the end face of the current collector 2 away from the limiting part 13.

[0092] Through the above steps, sufficient material can be used at the second end 12 to undergo plastic deformation to form the riveting portion 14 filling the second hole segment 212. This not only increases the volume of the riveting portion 14 but also increases the contact area between the riveting portion 14 and the second hole segment 212, thereby further improving the connection stability of the mandrel 1 and the current collector 2 and enhancing the sealing effect. By aligning the end face of the riveting portion 14 facing away from the first end 11 along the first direction with the end face of the current collector 2 facing away from the limiting portion 13, the dynamic balance of the current collector 2 can be improved.

[0093] For example, the end face of the riveting part 14 away from the first end 11 along the first direction is processed by grinding or other processes, so that the end face of the riveting part 14 away from the first end 11 along the first direction is flush with the end face of the current collector 2 away from the limiting part 13.

[0094] As an alternative to step S1, the current collector 2 can also be heated, causing it to expand and increase the inner diameter of the shaft hole 21, thus improving the ease of inserting the mandrel 1 into the shaft hole 21. For example, induction heating, oven heating, or other methods from the prior art can be used to heat the current collector 2.

[0095] Furthermore, as an alternative to step S4, the current collector 2 is allowed to return to room temperature so that the mandrel 1 and the first hole segment 211 are interference-fitted. Specifically, by waiting for the current collector 2 to cool down and return to room temperature, the shaft hole 21 can be contracted, thereby allowing the mandrel 1 and the first hole segment 211 to be interference-fitted, thus achieving the initial fastening of the mandrel 1 and the current collector 2.

[0096] Note that the above description is merely a preferred embodiment of the present invention and the technical principles employed. Those skilled in the art will understand that the present invention is not limited to the specific embodiments described herein, and various obvious changes, readjustments, and substitutions can be made without departing from the scope of protection of the present invention. Therefore, although the present invention has been described in detail through the above embodiments, the present invention is not limited to the above embodiments, and may include many other equivalent embodiments without departing from the concept of the present invention, the scope of which is determined by the scope of the appended claims.

Claims

1. An electric motor electrically conductive connection structure, characterized by, include: A mandrel, the mandrel comprising a first end and a second end, the first end being provided with a limiting portion; A current collector is provided with a shaft hole that extends through a first direction. The shaft hole includes a first hole segment and a second hole segment connected together. At least a portion of the inner diameter of the second hole segment is larger than the inner diameter of the first hole segment. The second end is inserted into the shaft hole and riveted to form a riveted part. The riveted part can fill the second hole segment. The mandrel is interference-fitted with the first hole segment. The limiting part can abut against one end of the current collector that is away from the second hole segment along the first direction.

2. The electric machine electrically conductive connection structure of claim 1, wherein, The limiting part is a shoulder.

3. The electric machine electrically conductive connection structure of claim 2, wherein, The second hole is a tapered hole, and the inner diameter of the tapered hole gradually decreases along the first direction from the riveting part to the limiting part.

4. The electric machine electrically conductive connection structure of claim 1, wherein, Along the first direction, the end face of the riveting portion opposite to the first end is flush with the end face of the current collector opposite to the limiting portion.

5. The electric machine electrically conductive connection structure of claim 1, wherein, The current collector has grooves on both end faces along the first direction.

6. The electric machine electrically conductive connection structure of any of claims 1-5, wherein, The second end is provided with a first terminal block.

7. An electric machine electrically conductive connection structure according to any one of claims 1-5, characterized in that, The shaft hole is provided in three parts, and the three shaft holes are arranged in an equilateral triangle. The mandrel is provided in three parts, and the three mandrels are connected to the three shaft holes in a one-to-one correspondence.

8. An electric machine characterized by Includes the motor conductive connection structure as described in any one of claims 1-7.

9. Vehicle, characterized in that Includes the motor as described in claim 8.

10. A method of assembling an electrically conductive connection structure of an electric machine, characterized in that Applied to the electric motor conductive connection structure as described in any one of claims 1-7; The assembly method for the motor conductive connection structure includes the following steps: The mandrel is frozen, or the current collector is heated; Insert the second end into the shaft hole; The limiting part is pressed against the end of the current collector that is away from the second hole segment along the first direction; The mandrel or the current collector is brought back to room temperature so that the mandrel is interference-fitted with the first hole segment. Position the current collector above the first end; The first end is connected to the support structure, and the current collector is suspended in the air; The second end is press-fitted to form the riveted portion that fills the second hole segment.

11. The method of claim 10, wherein After inserting the second end into the shaft hole, the following steps are also included: The second end extends from the end of the second hole segment that is away from the first hole segment; After riveting the second end and forming the riveted portion filling the second hole segment, the following steps are also included: The end face of the riveting part away from the first end along the first direction is processed so that the end face of the riveting part away from the first end along the first direction is flush with the end face of the current collector away from the limiting part.

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