Electric machines and vehicles

Abstract

The application relates to a motor and a vehicle. The motor comprises a stator, a rotor located on the inner side of the stator, a motor shaft, the rotor being sleeved on one end of the motor shaft and fixed to the one end of the motor shaft, the other end of the motor shaft being provided with a through hole, and a wire, one end of the wire being accommodated in the through hole and the other end of the wire being connected with a winding of the rotor through the side wall of the motor shaft. The motor of the application is provided with the through hole on the motor shaft, the wire can extend into the through hole and extend out of the side wall of the motor shaft, and the wire is in conduction with the winding of the rotor fixed to the motor shaft, so that the current transmission function of the winding of the rotor is realized, the supporting effect of the motor shaft on the rotor is ensured, and the machining precision requirement of the motor shaft is reduced. Therefore, the manufacturing cost of the motor of the application is reduced.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of electric machines, and in particular to an electric machine and a vehicle comprising the electric machine. BACKGROUND

[0002] An electric machine generally comprises a stator, a rotor and a machine shaft. The rotor is fixed on the machine shaft, and the winding in the rotor is supplied with power by a wire, so as to realize power output of the electric machine in cooperation with the stator. However, in the prior art, a current transmission module is generally arranged on the machine shaft to supply power to the winding of the rotor, and the current transmission module also needs to support the rotor to a certain extent while supplying power.

[0003] In the prior art, the machine shaft and the current transmission module generally have high precision requirements to meet the connection between the machine shaft and the current transmission module, thereby increasing the manufacturing cost of the electric machine. SUMMARY

[0004] In view of the above deficiencies of the prior art, the present application aims to provide an electric machine capable of reducing manufacturing cost, and a vehicle comprising the electric machine. The technical solutions include the following.

[0005] In a first aspect, the present application provides an electric machine comprising:

[0006] a stator;

[0007] a rotor located on the inner side of the stator;

[0008] a machine shaft, the rotor being sleeved and fixed on one end of the machine shaft, and the other end of the machine shaft being provided with a through hole;

[0009] a wire, one end of the wire being accommodated in the through hole, and the other end of the wire being connected with the winding of the rotor through the side wall of the machine shaft.

[0010] The electric machine of the present application is provided with a through hole on the machine shaft, and the wire for transmitting current extends from the through hole to the side wall of the machine shaft, so as to electrically connect the wire with the winding of the rotor fixed on the outer edge of the machine shaft. Thus, the machine shaft supports the rotor while realizing the current transmission function of the winding of the rotor, thereby reducing the machining precision requirement of the electric machine on the machine shaft and reducing the manufacturing cost of the electric machine.

[0011] In an embodiment, the electric machine further comprises a connecting piece comprising a wire tube and a main body portion, the main body portion being fixed on the end portion of the machine shaft, and the wire tube extending into the through hole; the main body portion is provided with a through hole, the through hole being in communication with the inner hole of the wire tube, and the wire being fixed in the through hole and extending into the inner hole.

[0012] In one embodiment, the number of wires is two, the connecting member is provided with two wire tubes and two through holes, the two wire tubes are spaced apart from each other, each wire is fixed in one through hole and connected with the winding of the rotor through the inner hole of one wire tube.

[0013] In one embodiment, the axes of the two wire tubes are parallel, and the distance between the axis of each wire tube and the axis of the through hole is equal.

[0014] In one embodiment, the motor further comprises two slip rings and two brushes, the two slip rings are fixed on the outer edge of the main body part at intervals, each slip ring is electrically connected with one wire; each brush is in sliding connection with one slip ring, and one end of each brush is used for conducting with an external circuit, and the other end is in electrical connection with one slip ring.

[0015] In one embodiment, the side wall of the main body part is provided with an annular protrusion between the two slip rings.

[0016] In one embodiment, the end of the main body part close to the motor shaft is provided with a protruding part, the cross-sectional area of the protruding part gradually increases in the direction of the axis of the main body part towards the motor shaft; the end of the motor shaft away from the rotor is provided with an inclined slot matched with the protruding part, and the protruding part is embedded and fixed in the inclined slot.

[0017] In one embodiment, the main body part is provided with a communication hole, and the wire tube is arranged on the outer edge of the communication hole; the motor further comprises a shaft plug, one end of the shaft plug is embedded in the communication hole, the other end extends into the through hole and is fixedly connected with the motor shaft, and the shaft plug is used to realize synchronous rotation of the connecting member and the motor shaft.

[0018] In one embodiment, the hole wall of the communication hole is provided with a first positioning groove, the first positioning groove extends in the axial direction of the communication hole towards the wire tube, and the end of the shaft plug outside the through hole extends into and is embedded in the first positioning groove in the axial direction of the communication hole.

[0019] In one embodiment, the shaft plug is columnar, the diameter of the end of the shaft plug extending into the through hole is equal to the hole diameter of the through hole, the side wall of the shaft plug is provided with a groove for accommodating the wire tube.

[0020] In one embodiment, the side wall of the end of the shaft plug extending into the through hole is provided with a positioning protrusion, the side wall of the wire tube is provided with a protruding part extending in the direction away from the groove, and the protruding part and the positioning protrusion are arranged in circumferential direction at intervals; the hole wall of the through hole is provided with a second positioning groove and a third positioning groove arranged in circumferential direction at intervals, the second positioning groove is used to accommodate the protruding part, and the third positioning groove is used to accommodate the positioning protrusion.

[0021] In one embodiment, the through hole penetrates the motor shaft in the axial direction of the motor shaft, and the oil in the external pipeline can flow into the through hole through the end of the through hole away from the connecting member; the side wall of the motor shaft is provided with an oil passing hole in communication with the through hole.

[0022] In one embodiment, the side wall of the shaft plug is further provided with an oil passing groove, the oil passing groove is spaced from the groove, and the oil passing hole is communicated with the through hole through the oil passing groove.

[0023] In a second aspect, the embodiments of the present application provide a vehicle comprising the motor.

[0024] It can be understood that, for the vehicle provided by the second aspect of the present application, because the motor provided by the first aspect of the present application is adopted, the effect of low precision requirement and cost saving is achieved. BRIEF DESCRIPTION OF DRAWINGS

[0025] Figure 1 FIG. 1 is a structural schematic diagram of the motor provided by one embodiment of the present application;

[0026] Figure 2 FIG. 2 is a sectional structural schematic diagram of the motor provided by one embodiment of the present application;

[0027] Figure 3 FIG. 3 is another sectional structural schematic diagram of the motor provided by one embodiment of the present application;

[0028] Figure 4 FIG. 4 is a structural schematic diagram of the connecting piece provided by one embodiment of the present application;

[0029] Figure 5 FIG. 5 is a sectional structural schematic diagram of the connecting piece provided by one embodiment of the present application;

[0030] Figure 6 FIG. 6 is another sectional structural schematic diagram of the connecting piece provided by one embodiment of the present application;

[0031] Figure 7 FIG. 7 is an enlarged schematic diagram of the motor provided by one embodiment of the present application;

[0032] Figure 8 FIG. 8 is a structural schematic diagram of the shaft plug provided by one embodiment of the present application;

[0033] Figure 9 FIG. 9 is a partial structural schematic diagram of the motor provided by one embodiment of the present application;

[0034] Figure 10 FIG. 10 is a partial sectional structural schematic diagram of the motor provided by one embodiment of the present application;

[0035] Figure 11 FIG. 11 is another partial sectional structural schematic diagram of the motor provided by one embodiment of the present application;

[0036] Figure 12 FIG. 12 is a structural schematic diagram of the motor shaft provided by one embodiment of the present application;

[0037] Figure 13 A cross-sectional structure diagram of a motor shaft provided in an embodiment of the present application;

[0038] Figure 14 Another cross-sectional structure diagram of a motor shaft provided in an embodiment of the present application. DETAILED DESCRIPTION

[0039] In order to facilitate the understanding of the present application, the present application will be described in more detail below with reference to the relevant drawings. The preferred embodiments of the present application are shown in the drawings. However, the present application can be implemented in many different forms, and is not limited to the embodiments described herein. On the contrary, the purpose of providing these embodiments is to make the disclosure of the present application more thorough and comprehensive.

[0040] The following description of the embodiments is made with reference to the accompanying drawings, which illustrate specific embodiments in which the present application can be implemented. The serial numbers of the components in the text, such as "first", "second", etc., are only used to distinguish the described objects, and do not have any sequential or technical meaning. The "connection" and "coupling" mentioned in the present application, unless otherwise specified, include direct and indirect connections (couplings). The directional terms mentioned in the present application, such as "up", "down", "front", "back", "left", "right", "inside", "outside", "side", etc., are only the direction of the attached drawings, therefore, the directional terms used are for better, clearer illustration and understanding of the present application, and are not indicative or implied that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation on the present application.

[0041] In the description of the present application, it should be explained that, unless otherwise explicitly specified and limited, the terms "mounting", "connecting", "connection" should be understood in a broad sense, for example, it can be fixed connection, or detachable connection, or integral connection; it can be mechanical connection; it can be direct connection, or indirect connection through intermediate medium; it can be internal connection of two elements. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances. It should be explained that the terms "first", "second" and the like in the specification and claims of the present application and the drawings are used to distinguish different objects, and are not used to describe a specific order. In addition, the terms "including", "may include", "containing" or "may contain" used in the present application represent the existence of the corresponding functions, operations, elements, etc. disclosed, and do not limit other one or more functions, operations, elements, etc. In addition, the terms "including" or "containing" represent the existence of the corresponding features, numbers, steps, operations, elements, components or combinations thereof disclosed in the specification, and do not exclude the existence or addition of one or more other features, numbers, steps, operations, elements, components or combinations thereof, and are intended to cover non-exclusive inclusion.

[0042] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. The terminology used in the specification of the present application is only for the purpose of describing the specific embodiments and is not intended to limit the present application.

[0043] The present application provides a vehicle comprising a wheel and a motor. Wherein, the motor of the present application comprises a stator, a rotor, a wire and a motor shaft. The rotor is located inside the stator, one end of the wire is in conductive communication with the battery pack of the vehicle, and the other end is in conductive communication with the winding of the rotor. The motor shaft is fixedly connected with the rotor and is in driving connection with the wheel.

[0044] When the current is transmitted to the winding of the rotor through the wire, the rotor winding will generate a rotating magnetic field, which interacts with the magnetic field generated by the winding of the stator, thereby driving the rotor to rotate, and then driving the wheel to rotate through the motor shaft. The power output of the motor of the present application is realized.

[0045] Please refer to Figure 1 The structure schematic diagram of the motor 100 provided in an embodiment of the present application is shown in FIG. 1, please refer to Figure 2 The cross-sectional structure schematic diagram of the motor 100 provided in an embodiment of the present application is shown in FIG. 2, and please refer to Figure 3 The other cross-sectional structure schematic diagram of the motor 100 provided in an embodiment of the present application is shown in FIG. 3. In order to facilitate the description, Figure 1 and subsequent drawings, the stator and rotor in the motor 100 are omitted.

[0046] AsFigures 1-3 As shown in the drawings, the motor 100 of the present application comprises a motor shaft 10, a wire 20 and a connecting piece 30. The rotor is sleeved and fixed on one end of the motor shaft 10, and the other end of the motor shaft 10 is provided with a through hole 11 which penetrates the motor shaft 10 along the axial direction of the motor shaft 10 itself. The motor shaft 10 is further provided with a second through hole 12 which is arranged on the side wall of the motor shaft 10 and communicates with the through hole 11.

[0047] The connecting piece 30 comprises a wire tube 31 and a main body 32, the main body 32 is fixed on the end of the motor shaft 10, and the wire tube 31 extends into the through hole 11. The wire 20 is accommodated and fixed in the connecting piece 30, and one end of the wire 20 is electrically connected with the external circuit through the main body 32, and the other end extends into and is partially accommodated in the through hole 11 along the wire tube 31, and extends out of the second through hole 12 arranged on the side wall of the motor shaft 10 to be connected with the winding of the rotor fixed on the outer edge of the motor shaft 10. Thus, the current transmission function of the motor 100 of the present application is realized.

[0048] It can be understood that in other embodiments, the through hole 11 can also not be arranged along the axial direction of the motor shaft 10, and the wire 20 extending into the through hole 11 can extend out of the side wall of the motor shaft 10 and be electrically connected with the winding of the rotor. The present application does not make special limitation on this.

[0049] Specifically, please refer to Figure 4 the structural schematic diagram of the connecting piece 30 provided in an embodiment of the present application, please refer to Figure 5 the structural schematic diagram of the connecting piece 30 provided in an embodiment of the present application, please refer to Figure 6 the structural schematic diagram of the connecting piece 30 provided in an embodiment of the present application, and please refer to Figure 2 .

[0050] As shown in Figure 2 , Figure 4 , Figure 5 and Figure 6 , the side wall of the wire tube 31 is provided with a protruding portion 312, the protruding portion 312 is provided with a wire hole 313, and the wire hole 313 communicates with the inner hole 311 of the wire tube 31. The main body 32 is provided with a via hole 33, one end of the via hole 33 communicates with the external environment, and the other end communicates with the inner hole 311.

[0051] The wire 20 is fixed in the via hole 33 and extends into the inner hole 311 and the wire hole 313 along the extension direction of the via hole 33 in sequence, and extends out of the protruding portion 312. As shown in Figure 2 and Figure 4As shown, the lead tube 31 extends into the through hole 11, and the protruding part 312 of the lead tube 31 extends into the second through hole 12, so that the lead wire 20 extends into the through hole 11 from the outside of the motor shaft 10, and extends out of the second through hole 12.

[0052] That is, the arrangement of the connecting piece 30 in the motor 100 of the present application ensures that the lead wire 20 is in communication with the rotor winding along the through hole 11 and the second through hole 12, while also achieving the position fixation of the lead wire 20, thereby avoiding the axial displacement of the lead wire 20 when the motor shaft 10 rotates, thereby affecting the use of the motor 100 of the present application.

[0053] In one embodiment, as shown, Figures 1-6 The number of lead wires 20 of the motor 100 of the present application is two, which are a first lead wire 20a and a second lead wire 20b. Correspondingly, the second through hole 12 is also provided with two, and the lead tube 31 is also provided with two, which are a first lead tube 31a and a second lead tube 31b.

[0054] The first lead wire 20a is fixed to the first via hole 33a in the main body part 32, and the first lead wire 20a extends into the first inner hole 311a in the first lead tube 31a along the extension direction of the first via hole 33a, and extends out of the first lead wire hole 313a in the first protruding part 312a. The second lead wire 20b is fixed to the second via hole 33b in the main body part 32, and the second lead wire 20b extends into the second inner hole 311b in the second lead tube 31b along the extension direction of the second via hole 33b, and extends out of the second lead wire hole 313b in the second protruding part 312b.

[0055] The first lead wire 20a and the second lead wire 20b extending out of the first lead wire hole 313a and the second lead wire hole 313b pass through one second through hole 12 to connect with the opposite ends of the rotor winding, to cooperatively achieve the current transmission to the rotor winding.

[0056] Based on the rotor including a rotor core and a rotor winding, and the rotor winding is usually wound around the outer edge of the rotor core, and the rotor of the present application is fixed to one end of the motor shaft 10. It can be understood that in the motor 100 of the present application, the rotor is only arranged on the motor shaft 10. Correspondingly, only the motor shaft 10 supports the rotor.

[0057] In the prior art, the lead wire is usually arranged in the current transmission module, and the current transmission module is fixedly connected with the motor shaft, so that the lead wire extending out of the current transmission module is in communication with the rotor winding, to achieve the current transmission function of the motor. However, since the lead wire is arranged on the current transmission module, a part of the rotor is arranged on the outer edge of the current transmission module, so that the current transmission module also supports the rotor to a certain extent.

[0058] Therefore, in the prior art, in order to ensure the smooth operation of the rotor, it is necessary to ensure the relative position between the current transmission module and the motor shaft during the operation of the rotor. Therefore, when machining the matching parts of the current transmission module and the motor shaft, the current transmission module and the motor shaft need to have high machining precision requirements and material requirements, thereby increasing the cost and machining difficulty.

[0059] Therefore, compared with the prior art, the motor 100 of the present application can ensure the smooth operation of the motor 100 by providing the through hole 11 on the motor shaft 10 and the second through hole 12 on the side wall of the motor shaft 10, so that the wire 20 for transmitting current extends from the through hole 11 and extends from the second through hole 12, and the wire 20 is electrically connected with the winding of the rotor fixed on the outer edge of the motor shaft 10. Thus, while realizing the current transmission function of the rotor winding, only the motor shaft 10 supports the rotor in the motor 100 of the present application, thereby reducing the machining precision requirement of the motor 100 of the present application to the motor shaft 10 and reducing the manufacturing cost of the motor 100 of the present application.

[0060] In one embodiment, as shown in Figure 2 , Figure 4 and Figure 5 , the geometric axis of the main body 32 of the connecting piece 30 coincides with the axis of the through hole 11. The first wire tube 31a and the second wire tube 31b are spaced apart from each other, the axes of the first wire tube 31a and the second wire tube 31b are parallel to each other, and the distance between the axis of the first wire tube 31a and the geometric axis of the main body 32 is equal to the distance between the axis of the second wire tube 31b and the geometric axis of the main body 32.

[0061] That is, the included angle between the connecting line between the axis of the first wire tube 31a and the geometric axis of the main body 32 and the connecting line between the axis of the second wire tube 31b and the geometric axis of the main body 32 is 180°.

[0062] Based on the fixed connection between the connecting piece 30 and the motor shaft 10, when the motor shaft 10 rotates around its own axis, the connecting piece 30 will also rotate along the axis of the motor shaft 10. It can be understood that this structure can ensure that during the rotation of the connecting piece 30, the connecting piece 30 will not produce eccentric torque due to the positions of the first wire tube 31a and the second wire tube 31b, thereby ensuring the smooth operation of the motor shaft 10 and the smooth operation of the motor 100 of the present application.

[0063] In one embodiment, as shown in Figures 1-6As shown, the motor 100 of the present application further comprises two slip rings 40, namely a first slip ring 40a and a second slip ring 40b. Correspondingly, the side wall of the main body 32 is further provided with a first annular groove 321a and a second annular groove 321b which are spaced apart from each other. Among them, the first slip ring 40a is fixed in the first annular groove 321a, and the second slip ring 40b is fixed in the second annular groove 321b.

[0064] The first via hole 33a is in communication with the first annular groove 321a, and the first lead wire 20a fixed in the first via hole 33a is electrically connected with the first slip ring 40a. The second via hole 33b is in communication with the second annular groove 321b, and the second lead wire 20b fixed in the second via hole 33b is electrically connected with the second slip ring 40b.

[0065] The motor 100 of the present application further comprises two brushes (not shown in the figure). Among them, each brush is in sliding connection with a slip ring 40, and one end of each brush is used for communication with an external circuit, and the other end of the corresponding slip ring 40 is electrically connected.

[0066] Among them, when the motor shaft 10 drives the connecting piece 30 to rotate, the first slip ring 40a and the second slip ring 40b also rotate around the axis of the motor shaft 10. It can be understood that the matching arrangement of the brush and the slip ring 40 can ensure that the first slip ring 40a and the second slip ring 40b rotate around the axis of the motor shaft 10 while ensuring that the first slip ring 40a and the second slip ring 40b are electrically connected with the corresponding brush. Thus, the transmission of current in the first lead wire 20a and the second lead wire 20b is ensured.

[0067] Based on the rotation of the rotor, it is necessary to ensure that the rotor winding has current. That is, the matching arrangement of the brush and the slip ring 40 ensures the rotation of the rotor and the stability of the rotation, thereby ensuring the power output function and the running stability of the motor 100 of the present application.

[0068] It can be understood that in other embodiments, the brush can also be arranged on the connecting piece 30, and correspondingly, one end of the slip ring should be electrically connected with the external circuit, and the other end should be in sliding connection with the brush and be electrically connected.

[0069] Please refer to Figure 7 The enlarged schematic view of the motor 100 provided in an embodiment of the present application is shown. Please refer to Figure 2 and Figure 5 .

[0070] As Figure 2 , Figure 5 and Figure 7As shown, an annular protrusion 322 is provided on the side wall of the main body 32, wherein the annular protrusion 322 is located between the first annular groove 321a and the second annular groove 321b. During the relative sliding process between the slip ring 40 and the brush, the slip ring 40 and the brush will rub against each other, and this friction will cause the brush to generate conductive carbon powder.

[0071] Understandably, the annular protrusion 322 increases the gap between the first slip ring 40a and the second slip ring 40b, thereby preventing the accumulation of carbon powder on the side wall of the main body 32 between the first slip ring 40a and the second slip ring 40b. This avoids the phenomenon of short circuit between the first slip ring 40a and the second slip ring 40b due to carbon powder accumulation, thus ensuring the safe operation of the motor 100 of this application.

[0072] In one embodiment, such as Figure 2 , Figure 5 and Figure 7 As shown, the main body 32 has a protrusion 323 at its end near the motor shaft 10, wherein the cross-sectional area of ​​the protrusion 323 gradually increases along the axial direction of the main body 32 toward the motor shaft 10. That is, along the axial direction of the main body 32, the cross-sectional area of ​​the protrusion 323 near the second annular groove 321b is smaller than the cross-sectional area of ​​the protrusion 323 away from the second annular groove 321b. Correspondingly, the end of the motor shaft 10 away from the rotor has a sloping groove 15, and the sloping groove 15 is matched with the protrusion 323. That is, along the axial direction of the main body 32 toward the motor shaft 10, the groove depth of the sloping groove 15 gradually increases.

[0073] like Figure 7 As shown, the protrusion 323 is matched with the inclined groove 15 so that the protrusion 323 can be embedded and fixed in the inclined groove 15, limiting the displacement of the main body 32 along the axis of the motor shaft 10, thereby avoiding the phenomenon of axial movement of the connector 30 during the rotation of the connector 30 with the motor shaft 10, and thus ensuring the smooth operation of the motor 100 of this application.

[0074] It is understood that in other embodiments, the connection between the main body 32 and the motor shaft 10 may be in other ways, and this application does not impose any particular restrictions on this.

[0075] Please see Figure 8 The schematic diagram of the shaft plug 50 provided in one embodiment of this application is shown below. Figure 9 The diagram shown is a partial structural schematic of the motor 100 provided in one embodiment of this application. Please refer to [link / reference]. Figure 10 The diagram shown is a partial cross-sectional view of the motor 100 provided in one embodiment of this application, and please refer to [the following text is also included]. Figure 11 The diagram shown is a partial cross-sectional view of the motor 100 provided in one embodiment of this application.

[0076] As shown in Figures 8-11 , the main body 32 is provided with a through hole 324, and the two wire tubes 31 are arranged at the outer edge of the through hole 324. The motor 100 further comprises a shaft plug 50, which comprises a first connecting part 51 and a second connecting part 52. The first connecting part 51 is embedded in the through hole 324, and the second connecting part 52 extends into the through hole 11 along with the connecting piece 30 and is fixedly connected with the motor shaft 10. The shaft plug 50 is used to realize the synchronous rotation of the connecting piece 30 and the motor shaft 10.

[0077] Specifically, please refer to Figure 2 . The second connecting part 52 of the shaft plug 50 is in a columnar shape, and the diameter of the second connecting part 52 is equal to the hole diameter of the through hole 11. The sidewall of the second connecting part 52 is provided with two grooves 521, and the first wire tube 31a and the second wire tube 31b extend into one groove 521 respectively and are accommodated in the corresponding groove 521.

[0078] It can be understood that when the second connecting part 52 of the shaft plug 50 extends into the through hole 11, the sidewall of the second connecting part 52 cooperates with the hole wall of the through hole 11 to realize the interference fit of the shaft plug 50 and the motor shaft 10, thereby realizing the fixed connection of the shaft plug 50 and the motor shaft 10.

[0079] Since the first connecting part 51 of the shaft plug 50 is embedded in the through hole 324 of the main body 32, when the motor shaft 10 rotates, the torque for driving the motor shaft 10 to rotate can be transmitted to the main body 32 through the shaft plug 50, thereby realizing the synchronous rotation of the connecting piece 30 and the motor shaft 10.

[0080] In an embodiment, as shown in Figures 8-11 , the hole wall of the through hole 324 is provided with a first positioning groove 3241, the first positioning groove 3241 extends along the axial direction of the through hole 324 and towards the wire tube 31, and the first connecting part 51 of the shaft plug 50 located outside the through hole 11 extends into and is embedded in the first positioning groove 3241 along the axial direction of the through hole 324, so as to realize the fixed connection of the shaft plug 50 and the connecting piece 30.

[0081] In an embodiment, the number of first positioning grooves 3241 is two, and the first connecting part 51 is provided with two connecting pieces 511, wherein each connecting piece 511 can extend into one first positioning groove 3241, so as to improve the connection stability of the shaft plug 50 and the connecting piece 30 on the premise of realizing the fixed connection of the shaft plug 50 and the connecting piece 30.

[0082] It can be understood that in other embodiments, the fixed connection mode of the first connecting part 51 and the through hole 324 can also be other modes, which are not particularly limited in the application.

[0083] Please refer toFigure 12 The schematic diagram of the motor shaft 10 provided in one embodiment of this application is shown below. Figure 13 The diagram shown is a cross-sectional view of the motor shaft 10 provided in one embodiment of this application, and please refer to [the following text is also included]. Figure 14 The diagram shows another cross-sectional view of the motor shaft 10 provided in one embodiment of this application. See also... Figures 8-11 .

[0084] like Figures 8-14 As shown, a positioning protrusion 522 protrudes from the side wall of the second connecting portion 52 of the shaft plug 50, and a protrusion 312 extending toward the direction opposite to the groove 521 is provided on the side wall of the wire tube 31. The protrusion 312 and the positioning protrusion 522 are arranged circumferentially at intervals along the circumferential direction of the connecting hole 324.

[0085] The wall of the through hole 11 is provided with a second positioning groove 111 and a third positioning groove 112 arranged circumferentially. The protrusion 312 can extend into and be embedded in the second positioning groove 111, and the positioning protrusion 522 can extend into and be embedded in the third positioning groove 112, thereby realizing the circumferential movement of the shaft plug 50 within the through hole 11. Thus, while the motor shaft 10 rotates around its own axis, it further ensures that the connecting piece 30 rotates synchronously with the motor shaft 10.

[0086] In one embodiment, there are two positioning bumps 522. The geometric axes of the two positioning bumps 522 are parallel to each other, and the distance between the geometric axis of each positioning bump 522 and the geometric axis of the main body 32 is equal.

[0087] The first protrusion 312a of the first conduit 31a and the second protrusion 312b of the second conduit 31b also protrude from the side wall of the second connecting portion 52. Each positioning protrusion 522 is disposed between the first protrusion 312a and the second protrusion 312b along the circumferential direction of the connecting hole 324.

[0088] The through hole 11 has two corresponding second positioning grooves 111 and two third positioning grooves 112 inside its wall. Correspondingly, along the circumference of the through hole 11, each second positioning groove 111 is located between two third positioning grooves 112, and the two second positioning grooves 111 and the two third positioning grooves 112 are evenly distributed along the circumference.

[0089] like Figure 2As shown, the first and second protruding portions 312a and 312b protruding from the side wall of the second connecting portion 52 extend into the second positioning groove 111 respectively, and the two positioning protrusions 522 extend into the third positioning groove 112 respectively. It can be understood that the matching arrangement of the protruding portions 312 and the second positioning groove 111 and the matching arrangement of the positioning protrusions 522 and the third positioning groove 112 can further limit the circumferential movement of the shaft plug 50 in the through hole 11. Thus, while the motor shaft 10 rotates around its own axis, the connecting piece 30 is further ensured to rotate synchronously with the motor shaft 10.

[0090] It can be understood that in other embodiments, the number of positioning protrusions 522 can also be set to other numbers, which is not particularly limited in the present application.

[0091] Therefore, compared with the prior art, the connection mode of the connecting piece 30, the shaft plug 50 and the motor shaft 10 adopted by the motor 100 of the present application reduces the processing difficulty of the connecting piece 30, the shaft plug 50 and the motor shaft 10, and reduces the processing precision requirement of the above structure. At the same time, based on the fact that the connecting piece 30 and the shaft plug 50 do not support the rotor, the mechanical load required to be borne by the connecting piece 30 and the shaft plug 50 is relatively small during the rotation of the motor shaft 10, thereby resulting in that the strength of the required material of the connecting piece 30 and the shaft plug 50 is relatively low. Further, under the premise of ensuring the high speed and high mechanical load of the motor shaft 10 of the present application, the processing cost is further reduced.

[0092] In an embodiment, as shown in Figures 12-14 The motor shaft 10 further includes an extension section 14, and the side wall of the extension section 14 is provided with a tooth surface to facilitate transmission connection with an external structure. The extension section 14 is provided with an oil passage hole 141, wherein the axis of the oil passage hole 141 coincides with and communicates with the axis of the through hole 11. The oil passage hole 141 is used to communicate with an external pipeline.

[0093] As shown in Figure 3 As shown in the axial direction of the motor shaft 10, the length of the second connecting portion 52 of the shaft plug 50 is less than the extension length of the through hole 11. That is, the end surface of the shaft plug 50 blocking the through hole 11 in cooperation with the lead-through tube 31 can form a cavity in the motor shaft 10. Based on the fact that the oil passage hole 141 communicates with the through hole 11 and communicates with an external pipeline. It can be understood that the motor shaft 10 is filled with cooling oil to cool the heat absorbed by the motor shaft 10 from the surrounding environment during the operation of the motor shaft 10, to prevent the motor shaft 10 from overheating and affecting the normal operation of the motor shaft 10.

[0094] Specifically, the side wall of the motor shaft 10 is further provided with an oil passage hole 13, which communicates with the external environment and the through hole 11, so that the cooling oil in the motor shaft 10 can be thrown out of the motor shaft 10 under the action of centrifugal force during the rotation of the motor shaft 10, thereby achieving cooling and temperature reduction of the motor shaft 10.

[0095] Meanwhile, as shown in Figure 3 , the oil passing hole 13 includes a first oil passing hole 131 and a second oil passing hole 132, wherein the first oil passing hole 131 and the second oil passing hole 132 are arranged at opposite ends of the motor shaft 10 along the axial direction of the motor shaft 10, and are close to the end faces of the motor shaft 10.

[0096] Since during the operation of the motor shaft 10, the opposite ends of the motor shaft 10 are connected with external structures, thereby causing the heat of the part of the motor shaft 10 close to the end face to be relatively high. It can be understood that arranging the first oil passing hole 131 and the second oil passing hole 132 at the opposite ends of the motor shaft 10 and close to the end faces of the motor shaft 10 can further reduce the overall temperature of the motor shaft 10, and further achieve cooling and temperature reduction of the motor shaft 10. Thus, the normal operation of the motor shaft 10 is further ensured.

[0097] In an embodiment, as shown in Figure 3 and Figure 8 , the side wall of the second connecting part 52 of the shaft plug 50 is provided with an oil passing groove 523, and the oil passing groove 523 is communicated between the through hole 11 and the first oil passing hole 131. Based on the shaft plug 50 plugging one end of the through hole 11. It can be understood that the arrangement of the oil passing groove 523 can ensure the plugging effect of the shaft plug 50 on the through hole 11, while further ensuring the heat absorption effect of the cooling oil, and further achieving cooling and temperature reduction of the motor shaft 10. Thus, the normal operation of the motor shaft 10 is further ensured.

[0098] In an embodiment, the number of the first oil passing hole 131 is multiple, and the number of the second oil passing hole 132 is also multiple, and they are uniformly distributed along the axial direction of the motor shaft 10. Correspondingly, the number of the oil passing groove 523 is also multiple, and the number of the oil passing groove 523 is equal to the number of the first oil passing hole 131, and is arranged one by one.

[0099] It should be understood that the terms "first", "second" and the like are used only for the purpose of description, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the technical features indicated. Therefore, the features defined as "first", "second" can explicitly or implicitly include one or more of the features. In the description of the embodiments of the present application, the meaning of "multiple" is two or more, unless otherwise specifically limited.

[0100] In the description of the specification, the description using the terms "one embodiment", "some embodiments", "an exemplary embodiment", "an example", "a specific example" or "some examples" etc. means that the particular feature, structure, material or characteristic being described is included in at least one embodiment or example of the application. The illustrative appearances of the above-mentioned terms in various places in the specification are not necessarily intended to refer to the same embodiment or example. Moreover, the particular features, structures, materials or characteristics can be combined in any suitable manner in one or more embodiments or examples.

[0101] It should be understood that the application is not limited to the examples described above, which can be modified or transformed by a person of ordinary skill in the art according to the above description, and all these modifications and transformations shall fall within the protection scope of the claims of the application. A person of ordinary skill in the art can understand that all or part of the processes of the above embodiments are implemented, and equivalent changes made according to the claims of the application still fall within the scope of the application.

Claims

1. An electric machine characterized in that, The motor comprises: a stator; a rotor located inside the stator; a motor shaft, the rotor being sleeved and fixed to one end of the motor shaft, the other end of the motor shaft being provided with a through hole; a wire, one end of the wire being accommodated in the through hole, the other end of the wire being connected to the winding of the rotor through the side wall of the motor shaft; a connecting piece, the connecting piece comprising a wire tube and a main body portion, the main body portion being fixed to the end portion of the motor shaft, the wire tube extending into the through hole, the main body portion being provided with a through hole, the through hole being in communication with the inner hole of the wire tube, the wire being fixed in the through hole and extending into the inner hole; the number of the wires is two, the connecting piece being correspondingly provided with two wire tubes and two through holes, the two wire tubes being spaced from each other, and each wire being fixed in one through hole and connected to the winding of the rotor through the inner hole of one wire tube; the motor further comprises two slip rings, the two slip rings being fixed to the outer edge of the main body portion at intervals, each slip ring being electrically connected to one wire, the side wall of the main body portion being provided with an annular protrusion, the annular protrusion being located between the two slip rings; the outer diameter of the slip ring in the radial direction of the through hole is smaller than the distance between the outer periphery of the annular protrusion and the central axis of the through hole; the main body portion is provided with a communication hole, the wire tube being arranged at the outer edge of the communication hole; the motor further comprises a shaft plug, one end of the shaft plug being embedded in the communication hole, the other end of the shaft plug extending into the through hole and being fixedly connected to the motor shaft, the shaft plug being used to realize synchronous rotation of the connecting piece and the motor shaft; the hole wall of the communication hole is provided with a first positioning groove, the first positioning groove extending in the axial direction of the communication hole towards the wire tube, the end portion of the shaft plug located outside the through hole extending into and being embedded in the first positioning groove in the axial direction of the communication hole; the shaft plug comprises a first connecting portion, the first connecting portion being embedded in the communication hole, the number of the first positioning grooves is two, the first connecting portion being provided with two connecting pieces, and each connecting piece can extend into one first positioning groove; the shaft plug is in a columnar shape, the diameter of the end portion of the shaft plug extending into the through hole is equal to the hole diameter of the through hole, the side wall of the shaft plug is provided with a groove, and the groove is used to accommodate the wire tube; the side wall of the end portion of the shaft plug extending into the through hole is provided with a positioning protrusion, the side wall of the wire tube is provided with a protruding portion extending in a direction away from the groove, the protruding portion and the positioning protrusion are arranged at intervals in the circumferential direction of the communication hole; the hole wall of the through hole is provided with second positioning grooves and third positioning grooves arranged at intervals in the circumferential direction, the second positioning grooves being used to accommodate the protruding portion, and the third positioning grooves being used to accommodate the positioning protrusions; the number of the positioning protrusions is two, the hole wall of the through hole is provided with corresponding two second positioning grooves and two third positioning grooves, each second positioning groove is located between two third positioning grooves in the circumferential direction of the through hole, and the two second positioning grooves and the two third positioning grooves are uniformly distributed in the circumferential direction.

2. The electric machine of claim 1, wherein, The axes of the two wire tubes are parallel, and the distance between the axis of each wire tube and the axis of the through hole is equal.

3. The electric machine of claim 1, wherein, The motor further comprises two brushes, each of which is in sliding connection with the slip ring, and one end of each brush is used for conducting with an external circuit, and the other end is in electrical connection with the slip ring.

4. The electric machine of any of claims 1-3, wherein, The end of the main body part close to the motor shaft is provided with a protruding part, and the cross-sectional area of the protruding part gradually increases along the axial direction of the main body part towards the motor shaft. The end of the motor shaft away from the rotor is provided with an inclined groove matched with the protruding part, and the protruding part is embedded and fixed in the inclined groove.

5. The electric machine of any of claims 1-3, wherein, The through hole penetrates the motor shaft along the axial direction of the motor shaft, and the oil in the external pipeline can flow into the through hole through the through hole away from the connecting part. The side wall of the motor shaft is provided with an oil passing hole, and the oil passing hole is in communication with the through hole.

6. The electric machine of claim 5, wherein, The side wall of the shaft plug is further provided with an oil passing groove, and the oil passing groove is spaced from the recess, and the oil passing hole is in communication with the through hole through the oil passing groove.

7. A vehicle characterized by comprising: The motor comprises the motor as claimed in any one of claims 1-6.

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