CN221328698U - Electric drive system - Google Patents
Electric drive system Download PDFInfo
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- CN221328698U CN221328698U CN202322804199.0U CN202322804199U CN221328698U CN 221328698 U CN221328698 U CN 221328698U CN 202322804199 U CN202322804199 U CN 202322804199U CN 221328698 U CN221328698 U CN 221328698U
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- rotor shaft
- axial
- drive system
- electric drive
- shaft
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- 230000005540 biological transmission Effects 0.000 claims abstract description 10
- 238000003475 lamination Methods 0.000 abstract description 9
- 238000000034 method Methods 0.000 abstract description 4
- 230000008569 process Effects 0.000 abstract description 4
- 230000002035 prolonged effect Effects 0.000 abstract description 2
- 238000009434 installation Methods 0.000 description 4
- 230000006872 improvement Effects 0.000 description 2
- UFHFLCQGNIYNRP-UHFFFAOYSA-N Hydrogen Chemical compound [H][H] UFHFLCQGNIYNRP-UHFFFAOYSA-N 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 238000002485 combustion reaction Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 239000002803 fossil fuel Substances 0.000 description 1
- 229910052739 hydrogen Inorganic materials 0.000 description 1
- 239000001257 hydrogen Substances 0.000 description 1
- 238000005461 lubrication Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 230000036316 preload Effects 0.000 description 1
- 230000001172 regenerating effect Effects 0.000 description 1
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- Connection Of Motors, Electrical Generators, Mechanical Devices, And The Like (AREA)
Abstract
The utility model relates to an electric drive system comprising: an electric machine having a stator assembly and a rotor assembly, the rotor assembly having a rotor shaft; a transmission having an input shaft having an overlap portion with the rotor shaft in an axial direction; the axial pre-tightening part is axially arranged between the axial stop part of the rotor shaft and the axial stop part of the input shaft, and an axial fixing part of the axial pre-tightening part is arranged on the rotor shaft. According to the utility model, the axial pre-tightening part is arranged on the rotor shaft, so that the axial pre-tightening of the rotor lamination is realized, the vibration and noise in the running process of the motor are reduced, the service life of the motor can be prolonged, the motor can be prevented from falling off the rotor shaft, and the pre-positioning of the axial pre-tightening part on the rotor shaft is realized.
Description
Technical Field
The utility model relates to the technical field of motors, in particular to an electric drive system.
Background
The electric automobile is powered by a power battery to a driving motor, and the driving motor converts electric energy into mechanical energy so as to drive the automobile to run. Motor drive has various advantages over vehicles driven by internal combustion engines. For example, the motor can rotate forward and backward, so that the vehicle does not need to be retreated by arranging a reverse gear exclusively through the transmission device, and the motor only needs to rotate backward. Similarly, the motor can provide larger torque at low speed, and can meet the running requirement of the vehicle, so that a special transmission device is not required to be arranged to amplify the torque.
In an electric drive system of an electric automobile, a rotor used by a motor is formed by a plurality of laminations, so that axial distance between the laminations can change along with operation of the motor after installation, and in addition, the rotor expands in the operation process of the motor, so that vibration and noise are generated in the operation process of the motor, and stable operation of the motor and the whole electric drive system is affected.
Disclosure of utility model
The utility model provides the following technical scheme.
An electric drive system, the electric drive system comprising:
An electric machine having a stator assembly and a rotor assembly, the rotor assembly having a rotor shaft;
A transmission having an input shaft having an overlap portion with the rotor shaft in an axial direction;
The axial pre-tightening part is axially arranged between the axial stop part of the rotor shaft and the axial stop part of the input shaft, and an axial fixing part of the axial pre-tightening part is arranged on the rotor shaft.
According to an example of the present utility model, the axial pretensioning member is a wave spring, one end of which abuts against an axial stopper of the rotor shaft, and the other end of which abuts against an axial stopper of the input shaft.
According to an example of the present utility model, the axial fixing portion is a groove provided in the axial direction immediately adjacent to the axial stopper portion of the rotor shaft, and the wave spring is provided with a constricted portion fitted with the groove at an end abutting against the axial stopper portion of the rotor shaft.
According to one example of the utility model, the groove is an annular groove.
According to one example of the utility model, the axial fixing portion is a radially protruding portion, and a portion of the wave spring is axially located between an axial stop of the rotor shaft and the radially protruding portion.
According to one example of the utility model, an electrically conductive member is also provided on the rotor shaft, which electrically conductive member grounds the rotor shaft.
According to an example of the present utility model, both ends of the input shaft are supported on the housing by bearings, respectively.
According to an example of the utility model, the input shaft is a hollow shaft, one end of the rotor shaft extends into the input shaft, and the other end is supported on the housing through a bearing.
According to an example of the present utility model, the portion of the rotor shaft protruding into the input shaft is connected to the input shaft by a spline.
According to an example of the present utility model, the rotor shaft is provided with an oil guide groove.
By adopting the electric drive system according to the utility model, the following advantageous effects can be achieved:
The axial pre-tightening part is arranged on the rotor shaft, so that the axial pre-tightening of the rotor lamination is realized, vibration and noise in the running process of the motor are reduced, and the service life of the motor can be prolonged. In addition, set up the axial fixed part of axial pretension part on the rotor shaft, can be fixed axial pretension part, avoid it to drop from the rotor shaft, realized the prepositioning of axial pretension part on the rotor shaft, also do not increase the processing degree of difficulty and cost simultaneously.
Other features and advantages of the present utility model will be described in the following detailed description of the utility model, taken in conjunction with the accompanying drawings.
Drawings
Exemplary embodiments of the present utility model are described with reference to the accompanying drawings, in which:
fig. 1 shows a cross-sectional view of the electric drive system of the present utility model.
Fig. 2 shows a perspective view of a part of a rotor shaft of an electric drive system of the utility model.
Fig. 3 shows a cross-sectional view of a part of a rotor shaft of an electric drive system of the utility model.
Fig. 4 shows a top view of the wave spring of the present utility model.
Fig. 5 shows a schematic view of a motor vehicle with an electric drive system according to the utility model.
All the figures are schematic and not necessarily to scale, and they show only those parts which are necessary in order to elucidate the utility model, the other parts being omitted or merely mentioned. That is, the present utility model may include other components in addition to those shown in the drawings.
In the drawings, identical and/or functionally identical technical features are provided with the same or similar reference signs.
Detailed Description
Embodiments of the present utility model are described below with reference to the accompanying drawings. In the following description, numerous specific details are set forth in order to provide a thorough understanding and enabling description of the utility model to one skilled in the art. It will be apparent, however, to one skilled in the art that the present utility model may be practiced without some of these specific details. Furthermore, it should be understood that the utility model is not limited to specific described embodiments. Rather, any combination of the features and elements described below is contemplated to implement the utility model, whether or not they relate to different embodiments. Thus, the following aspects, features, embodiments and advantages are merely illustrative and should not be considered features or limitations of the claims except where explicitly set out in a claim.
Description of orientations such as "upper", "lower", "inner", "outer", "radial", "axial", etc. which may be used in the following description are for convenience of description only and are not intended to limit the inventive arrangements in any way unless explicitly stated. Furthermore, terms such as "first," "second," and the like, are used hereinafter to describe elements of the present utility model, and are merely used for distinguishing between the elements and not intended to limit the nature, sequence, order, or number of such elements.
Fig. 1 shows a cross-sectional view of the electric drive system of the present utility model. As can be seen from fig. 1, the electric drive system comprises an electric motor on the right and a transmission on the left. The motor has a housing 1, and a stator assembly and a rotor assembly 2, not shown, are accommodated in the housing 1. As a preferred embodiment, the rotor in the rotor assembly 2 is formed of a plurality of rotor laminations. A plurality of rotor laminations are arranged on the rotor shaft 3. The transmission has an input shaft 4, the input shaft 4 being connected with the rotor shaft 3 for power output of the motor. Specifically, the input shaft 4 is provided in the form of a hollow shaft, and one end of the rotor shaft 3 extends into the interior of the input shaft 4, and the two are connected by a spline.
Both ends of the input shaft 4 are supported by bearings, respectively, so that the input shaft 4 is rotatably supported on the housing. One end of the rotor shaft 3 is supported inside the input shaft 4, and the other end is supported on the housing 1 of the motor through a bearing.
As a key improvement of the utility model, an axial pretensioning member is provided in the axial space between the input shaft 4 and the rotor shaft 3. The axial pretensioning member preferably employs a wave spring 5. Of course, the person skilled in the art knows that any other possible known element can be used for the axial pretensioning member. As described above, since the rotor is formed of a plurality of laminations, the axial distance between the laminations varies with the operation of the motor after the installation, and in addition, the rotor expands during the operation of the motor, so that the rotor can be preloaded by providing the wave spring 5 to provide a certain preload to the rotor shaft 3 in the axial direction. This reduces vibrations and noise during operation of the motor and also increases the service life.
Furthermore, during operation of the motor, shaft voltages may occur. In order to eliminate the shaft voltage, an electrically conductive part 6 is also provided on the rotor shaft 3, which electrically conductive part 6 can connect the rotor shaft 3 to the housing in an electrically conductive connection, so that the rotor shaft 3 is grounded to eliminate the shaft voltage.
Fig. 2 shows a perspective view of a part of a rotor shaft of an electric drive system of the utility model. As can be seen in connection with fig. 1, a part of the rotor shaft shown in fig. 2 does not comprise a part for supporting the rotor laminations. The portion comprises a first section 31, the first section 31 being provided with external splines for forming a splined connection with internal splines of the input shaft 4, such that the rotor shaft 3 rotates together with the input shaft 4. The part also comprises a second section 32, and the wave spring 5 is sleeved on the second section 32. Furthermore, it can be seen from fig. 2 that a plurality of inclined grooves are provided on the second section 32, which inclined grooves are used here as oil grooves for the lubrication of the rotor shaft. The part furthermore comprises a third section 33, the outer diameter of which is larger than the outer diameter of the second section, whereby the third section 33 forms a shoulder at the connection with the second section 32, which shoulder can be brought into abutment with the wave spring 5 in one direction.
Fig. 3 shows a cross-sectional view of a part of a rotor shaft of an electric drive system of the utility model. In addition to the features already shown in fig. 2, the wave spring fixing portion 321 is also shown in fig. 3. As an improvement of the present utility model, the applicant has realized that, with the existing installation structure of the wave spring and the shaft, the wave spring is directly provided on the shaft, the wave spring provides the pre-tightening force by abutting the shaft shoulder or the like at both ends in the axial direction, but there is no fitting relationship between the wave spring itself and the shaft, whereby the situation that the wave spring is detached easily occurs when the wave spring is installed on the rotor shaft, which reduces the production efficiency, and easily results in that the electric drive system is not actually installed with the wave spring, so that the axial pre-tightening described above cannot be achieved.
For this reason, the present utility model provides the wave spring fixing portion 321 so as to fix the wave spring in the axial direction, preventing the wave spring 5 from falling off from the shaft.
As a preferred embodiment, the wave spring fixing portion 321 takes the form of a groove, and a constriction design for fitting the groove is provided on the wave spring 5 in correspondence therewith.
Fig. 4 shows a top view of the wave spring of the present utility model. As can be seen from fig. 4, the wave spring 5 has a main body portion 51, the inner and outer diameters of the multi-turn structure forming the main body portion 51 are substantially on the same contour as seen in the axial direction, and a pinch portion 52 is provided at one end of the wave spring 5. The neck portion 52 is radially further inward than the body portion 51 to mate with a groove on the rotor shaft 3. Thus, when the wave spring 5 is fitted over the rotor shaft 3, the constriction 52 of the wave spring 5 automatically engages with the groove due to elasticity, so that the wave spring 5 is prevented from falling off, as long as the wave spring 5 is set in place.
As a preferred embodiment of the present utility model, the groove is an annular groove. Thus, the constriction 52 can always be snapped into the groove during installation, irrespective of the angle of the wave spring 5 in the circumferential direction.
As another embodiment of the present utility model, the wave spring fixing portion 321 may be formed in a convex manner. When the wave spring 5 is moved to a predetermined position, the wave spring 5 is rotated so that the outermost turn of the wave spring 5 can be engaged with the projection in the axial direction, thereby preventing the wave spring 5 from moving in the axial direction.
Fig. 5 shows a schematic view of a motor vehicle with an electric drive system according to the utility model. As an example, the automobile shown in fig. 5 has 4 wheels, two front wheels and two rear wheels, respectively. The two front wheels are connected through an axle, and the front wheels are used as steering wheels. Between the two front wheels, there are provided a drive motor M as a power source, and a transmission T mechanically connected to the drive motor for transmitting the power of the drive motor to the wheels. Fig. 5 also shows an arrangement in which the same drive motor M and transmission T are also provided on the rear axle, thereby enabling the vehicle to function as a four-wheel drive vehicle. Of course, the drive motor M and the transmission T may be arranged only on the front axle, thereby forming a front-wheel drive vehicle, or only on the rear axle, thereby forming a rear-wheel drive vehicle.
Also shown in fig. 5 are the power battery B and the electronic control unit ECU of the vehicle. The power battery B is electrically connected to the driving motor M so that electric power can be transmitted to the driving motor M to drive the vehicle to travel. When the vehicle is decelerating, the drive motor M may perform regenerative braking to convert kinetic energy of the vehicle into electric energy to charge the power battery B.
The motor and the inverter provided by the utility model can be applied to various types of electrically driven vehicles. For example, the present utility model may be applied to a battery-powered electric vehicle alone, or to a hybrid vehicle provided with a power source including other types in addition to an electric motor, such as a fossil fuel engine, a hydrogen engine, or the like.
The structure of the present utility model has been described in detail above. Those skilled in the art will recognize that many of the details described are exemplary only and not limiting. That is, it is only necessary to achieve the corresponding functions, and it is not necessary to employ the specific shape, structure, and the like described above.
While the present utility model has been described with respect to the above exemplary embodiments, it will be apparent to those skilled in the art that various other embodiments can be devised by modifying the disclosed embodiments without departing from the spirit and scope of the utility model. Such embodiments should be understood to fall within the scope of the utility model as determined based on the claims and any equivalents thereof.
Claims (10)
1. An electric drive system, comprising:
An electric machine having a stator assembly and a rotor assembly, the rotor assembly having a rotor shaft;
A transmission having an input shaft having an overlap portion with the rotor shaft in an axial direction;
The axial pre-tightening part is axially arranged between the axial stop part of the rotor shaft and the axial stop part of the input shaft, and an axial fixing part of the axial pre-tightening part is arranged on the rotor shaft.
2. An electric drive system according to claim 1, characterized in that,
The axial pre-tightening component is a wave spring, one end of the wave spring is abutted against the axial stop part of the rotor shaft, and the other end of the wave spring is abutted against the axial stop part of the input shaft.
3. An electric drive system according to claim 2, characterized in that,
The axial fixing part is a groove which is arranged close to the axial stop part of the rotor shaft in the axial direction, and the wave spring is provided with a shrinkage part matched with the groove at one end which is abutted with the axial stop part of the rotor shaft.
4. An electric drive system according to claim 3, characterized in that,
The groove is an annular groove.
5. An electric drive system according to claim 2, characterized in that,
The axial fixing portion is a radially protruding portion, and a portion of the wave spring is axially located between the axial stopper portion of the rotor shaft and the radially protruding portion.
6. An electric drive system according to any one of claims 1-5, characterized in that,
A conductive member is also provided on the rotor shaft, the conductive member grounding the rotor shaft.
7. An electric drive system according to any one of claims 1-5, characterized in that,
The two ends of the input shaft are respectively supported on the shell through bearings.
8. The electric drive system of claim 7, wherein the electric drive system comprises a drive system,
The input shaft is a hollow shaft, one end of the rotor shaft extends into the input shaft, and the other end of the rotor shaft is supported on the shell through a bearing.
9. The electric drive system of claim 8, wherein the electric drive system comprises a drive system,
The part of the rotor shaft extending into the input shaft is connected with the input shaft through a spline.
10. An electric drive system according to any one of claims 1-5, characterized in that,
And the rotor shaft is provided with an oil guide groove.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202322804199.0U CN221328698U (en) | 2023-10-18 | 2023-10-18 | Electric drive system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202322804199.0U CN221328698U (en) | 2023-10-18 | 2023-10-18 | Electric drive system |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN221328698U true CN221328698U (en) | 2024-07-12 |
Family
ID=91785770
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202322804199.0U Active CN221328698U (en) | 2023-10-18 | 2023-10-18 | Electric drive system |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN221328698U (en) |
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2023
- 2023-10-18 CN CN202322804199.0U patent/CN221328698U/en active Active
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| GR01 | Patent grant | ||
| GR01 | Patent grant |