CN209776172U - Power device and electric automobile - Google Patents
Power device and electric automobile Download PDFInfo
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- CN209776172U CN209776172U CN201920397798.6U CN201920397798U CN209776172U CN 209776172 U CN209776172 U CN 209776172U CN 201920397798 U CN201920397798 U CN 201920397798U CN 209776172 U CN209776172 U CN 209776172U
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Abstract
The embodiment of the utility model provides a power device and electric automobile, power device includes motor portion, first transmission portion and second transmission portion; wherein: the second transmission part comprises a sun wheel, a first planet wheel and a planet carrier, the first planet wheel is driven to rotate by the sun wheel, the planet carrier is driven to rotate by the first planet wheel, and an output shaft of the planet carrier is connected to the differential shell; the rotating shaft of the motor part drives the sun gear of the second transmission part to rotate through the first transmission part, and the rotating shaft of the motor part is parallel to the rotating shaft of the sun gear. The embodiment of the utility model provides a cancel traditional splined connection between motor shaft and the reduction gear input shaft, can reduce input-output shaft centre-to-centre spacing simultaneously to make whole power device's volume reduce greatly, the power device of being more convenient for installs on whole car.
Description
Technical Field
The embodiment of the utility model provides a relate to the automobile field, more specifically say, relate to a power device and electric automobile.
Background
At present, a power assembly of a pure electric vehicle mainly comprises a motor, a speed reducer, a motor controller and the like. As shown in fig. 1, in the pure electric vehicle powertrain, a motor shaft 11 and an input shaft 13 of a reducer are fixedly connected by a spline 12. The input shaft 13 of the reduction gear outputs torque to the output shaft 15 of the reduction gear through multiple sets of parallel shaft gear transmissions, and the output shaft 15 of the reduction gear drives a differential on a wheel shaft 16 to rotate, thereby outputting torque to wheels 18.
Specifically, the first gear 131 on the input shaft 13 of the reducer meshes with the second gear 141 on the reducer intermediate shaft 14, and the third gear 142 on the reducer intermediate shaft 14 meshes with the fourth gear 151 on the reducer output shaft.
The pure electric vehicle power assembly is simple in structure and can well realize power output. However, as shown in FIG. 2, since the speed reducer employs a multi-stage parallel axis gear transmission, the center distance of the input-output shafts is determined by the first pole center distance O1O2And a second pole center distance O2O3Make up and make the center distance O of the input-output shaft of the speed reducer1O3Larger, resulting in a larger reducer volume.
Further, since the motor shaft 11 and the reducer input shaft 13 are two shafts connected by the spline 12, Noise, Vibration, and Harshness (NVH) problems are likely to occur due to a pitch error, radial runout, and the like of the spline 12.
In addition, the pure electric vehicle power assembly also has the problems of a large number of bearings (for example, 8 bearings shown in fig. 1) and the like, so that the overall cost of the transmission structure is high.
SUMMERY OF THE UTILITY MODEL
The embodiment of the utility model provides a to the above-mentioned pure electric vehicles power assembly is bulky, easily produce NVH problem and the relatively higher problem of cost, provide a power device and electric automobile.
The embodiment of the present invention provides a power device for outputting torque to a differential on a wheel axle, wherein the power device comprises a motor part, a first transmission part and a second transmission part; wherein: the second transmission part comprises a sun wheel, a first planet wheel and a planet carrier, the first planet wheel is driven to rotate by the sun wheel, the planet carrier is driven to rotate by the first planet wheel, and an output shaft of the planet carrier is connected to the differential; the rotating shaft of the motor part drives the sun gear of the second transmission part to rotate through the first transmission part, and the rotating shaft of the motor part is parallel to the rotating shaft of the sun gear.
Preferably, the first transmission part includes a first gear and a second gear engaged with the first gear; the first gear is fixed on a rotating shaft of the motor part and is driven to rotate by the rotating shaft of the motor part; the second gear is fixed on the rotating shaft of the sun gear and drives the sun gear to rotate.
Preferably, the second transmission part is provided with a wheel axle cavity for the wheel axle to pass through and a differential cavity for mounting the differential; the wheel axle cavity, the differential mechanism cavity and the rotating shaft of the sun wheel are coaxial.
Preferably, a portion of the wheel axle cavity is located within the rotational axis of the sun gear; the differential cavity is located within the planet carrier.
Preferably, the second transmission part comprises a first bearing; the inner ring of the first bearing is fixed, and the wheel shaft penetrates through the inner ring of the first bearing; the rotating shaft of the sun gear is installed on the outer ring of the first bearing.
Preferably, the second transmission part comprises a second bearing, and the wheel axle chamber, the sun gear and the planet carrier are located between the first bearing and the second bearing; the outer ring of the second bearing is fixed, and the rotating shaft of the planet carrier is arranged on the inner ring of the second bearing; the wheel shaft passes through the inner race of the second bearing.
Preferably, the differential includes two second planet wheels and two side gears, and the two side gears are connected to the wheel shaft by internal and external splines; the two second planet wheels are respectively fixed on the axial inner wall of the differential through pin shafts, and each second planet wheel is respectively meshed with the two half shaft gears.
Preferably, the diameter of the first gear is smaller than the diameter of the second gear, which is larger than the diameter of the sun gear.
preferably, the motor part comprises a motor casing and an end cover positioned at the end of the motor casing, a third bearing is arranged in the motor casing, a fourth bearing is arranged on the end cover, and a rotating shaft of the motor part is respectively mounted on the third bearing and the fourth bearing; the first gear is mounted to an outer side of the fourth bearing.
The embodiment of the utility model provides an electric automobile is still provided, including the axletree, electric automobile still includes as above power device.
The utility model discloses power device and electric automobile exports the axletree after enlargiing the motor moment of torsion through first transmission portion and second transmission portion, and second transmission portion adopts the planetary transmission structure, can reduce input-output shaft centre-to-centre spacing to make whole power device's volume reduce greatly, the power device installation of being more convenient for on whole car.
And, the utility model discloses still through with the first gear snap-on of first transmission portion in the pivot of motor portion, motor and reduction gear adopt the integration axle promptly, the reducible quantity of using the bearing not only, reduce cost can avoid the NVH problem that splined connection produced moreover.
Drawings
FIG. 1 is a schematic structural diagram of a conventional pure electric vehicle powertrain;
FIG. 2 is a schematic diagram of a center distance between an input shaft and an output shaft of a reducer in a power assembly of a conventional pure electric vehicle;
Fig. 3 is a schematic structural diagram of a power plant provided by an embodiment of the present invention;
Fig. 4 is a schematic diagram of a center distance between an input shaft and an output shaft in the power device according to the embodiment of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more clearly understood, the present invention is further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
As shown in fig. 3, the schematic diagram of the power device provided by the embodiment of the present invention is that the power device can be applied to a pure electric vehicle, and outputs a torque to the differential 60 on the wheel axle 70 of the electric vehicle, so as to drive the wheel 80 to rotate, thereby realizing the operation of the electric vehicle. The power device of the present embodiment includes a motor portion 30, a first transmission portion 40, and a second transmission portion 50. The motor unit 30 includes a stator, a rotor, and a rotating shaft, and can convert electric energy into torque for output; the first transmission part 40 adopts a parallel shaft transmission structure, and transmits the torque output by the rotating shaft of the motor part 30 to the second transmission part 50 through the first transmission part 40; the second transmission portion 50 is of a planetary transmission structure, and can amplify the torque from the first transmission portion 40 and output the amplified torque to the differential 60 on the wheel shaft 70 of the electric vehicle, so as to drive the wheels 80 to rotate.
Specifically, the second transmission section 50 includes a sun gear 501, a first planetary gear 502, and a carrier 503. The rotation shaft of the motor part 30 is parallel to the rotation shaft of the sun gear 501, the rotation shaft of the motor part 30 drives the sun gear 501 to rotate through the first transmission part 40, the first planet gear 502 is driven to rotate by the sun gear 501, the planet carrier 503 is driven to rotate by the first planet gear 502, and the output shaft of the planet carrier 503 is connected to the differential 60. Thus, the torque output from the motor unit 30 can be amplified and output to the wheel axle 70, thereby driving the vehicle.
The power device amplifies the motor torque through the first transmission part 40 and the second transmission part 50 and outputs the amplified motor torque to the wheel shaft 70, and the second transmission part 50 adopts a planetary transmission structure, so that the planetary transmission is a coaxial structure, the center distance of an input shaft and an output shaft can be effectively reduced, the volume of the whole power device is greatly reduced, and the power device is more convenient to mount on the whole vehicle. And because the first transmission part 40 adopts parallel shaft gear transmission with smaller torque and the center distance thereof is relatively smaller, and the second transmission part 50 adopts planetary transmission with larger torque, the speed reduction transmission structure can be more compact.
In an embodiment of the present invention, the first transmission part 40 may include a first gear 401 and a second gear 402 engaged with the first gear 401. The first gear 401 is fixed on the rotating shaft of the motor part 30 and is driven by the rotating shaft of the motor part 30 to rotate; the second gear 50 is fixed to a rotation shaft of the sun gear 501 and drives the sun gear 501 to rotate. Through the mode, the rotating shaft of the motor part 30 is integrated with the input shaft of the transmission part, and the spline connection mode of the traditional structure is cancelled, so that NVH (noise, vibration and harshness) caused by manufacturing errors such as tooth pitch error and radial run-out of the spline is avoided. Meanwhile, the number of bearings can be reduced by adopting the integrated shaft, for example, eight bearings in the existing power assembly shown in fig. 1 can be reduced to four bearings, so that the cost is effectively reduced.
In particular, the diameter of the first gear 401 may be smaller than that of the second gear 402, so that the first transmission part 40 may achieve torque amplification to some extent while not occupying an installation space of the second transmission part 50.
To facilitate the reduction in volume, the second transmission portion 50 may be coupled to the wheel shaft 70. Specifically, the second transmission portion 50 includes a wheel axle chamber for passing the wheel axle 70 therethrough and a differential chamber for mounting the differential 60; the axle cavity of the wheel, the differential cavity and the rotating shaft of the sun gear 501 are coaxial. Specifically, in the above power unit, a part of the wheel axle chamber is located within the rotating shaft of the sun gear 501; the differential chamber is then located within the planet carrier 503. Through the mode, the wheel shaft 70 and the second transmission part 50 are coaxial, namely the second transmission part 50 is wrapped outside the wheel shaft 70, and the volume of the whole power device is further reduced.
As shown in fig. 4, in the power device, the speed reduction transmission structure formed by the first transmission part 40 and the second transmission part 50 has the center distance between the input and output shafts only equal to the center distance between the first gear 401 and the second gear 402 in the first transmission part 40, and compared with the conventional scheme in fig. 2, the scheme of combining the parallel shafts with the single planetary row transmission in the power device of the present embodiment can effectively reduce the center distance between the transmission parts, so that the structure of the whole power device is more compact, and the overall size can be significantly reduced.
further, the second transmission unit 50 may specifically include a first bearing 504, an inner race of the first bearing 504 is fixed (for example, fixed to a chassis structure of a vehicle, etc.), and the wheel shaft 70 passes through the inner race of the first bearing 504; the rotating shaft of the sun gear 501 is fixed to the outer race of the first bearing 504. Thus, when the second gear 402 rotates, the rotation shaft of the sun gear 501 and the sun gear 501 rotate along with the second gear 402, and torque transmission is realized. Also, the diameter of the sun gear 501 may be smaller than that of the second gear 402, thereby facilitating torque amplification in a planetary transmission manner.
The second transmission part 50 further comprises a second bearing 505, and the wheel axle chamber, the sun gear 501 and the planet carrier 503 are located between the first bearing 504 and the second bearing 505. The outer ring of the second bearing 505 is fixed (for example, fixed to the chassis of the vehicle), and the rotating shaft of the carrier 503 is attached to the inner ring of the second bearing 505; the wheel shaft 70 passes through the inner race of the second bearing 505.
The differential 60 may in particular comprise two second planet wheels and two side gears, and the two side gears are connected to the wheel shaft 70 by internal and external splines; two second planet wheels are respectively fixed on the axial side walls of the planet carrier 503 through pin shafts, and each second planet wheel is respectively meshed with two side gears. With the above structure, the differential 60 can be integrated into the second transmission part 50, and the overall size can be further reduced.
The motor part 30 comprises a motor shell and an end cover positioned at the end part of the motor shell, wherein a third bearing is arranged in the motor shell, a fourth bearing 302 is arranged on the end cover, and a rotating shaft of the motor part 30 is respectively arranged on inner rings of the third bearing 301 and the fourth bearing 302; the first gear 401 is mounted to the outside of the fourth bearing 302. Thus, the torque transfer between the motor part 30 and the transmission part can be realized only by two bearings, and the bearings are saved.
The embodiment of the utility model provides a still provide an electric automobile, this electric automobile includes the axletree and as above power device.
the above description is only for the preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any changes or substitutions that can be easily conceived by those skilled in the art within the technical scope of the present invention should be covered by the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.
Claims (10)
1. A power device for outputting torque to a differential on a wheel axle, characterized in that the power device comprises a motor part, a first transmission part and a second transmission part; wherein: the second transmission part comprises a sun wheel, a first planet wheel and a planet carrier, the first planet wheel is driven to rotate by the sun wheel, the planet carrier is driven to rotate by the first planet wheel, and an output shaft of the planet carrier is connected to the differential; the rotating shaft of the motor part drives the sun gear of the second transmission part to rotate through the first transmission part, and the rotating shaft of the motor part is parallel to the rotating shaft of the sun gear.
2. The power unit according to claim 1, wherein the first transmission portion includes a first gear and a second gear meshed with the first gear; the first gear is fixed on a rotating shaft of the motor part and is driven to rotate by the rotating shaft of the motor part; the second gear is fixed on the rotating shaft of the sun gear and drives the sun gear to rotate.
3. The power plant of claim 1, wherein the second transmission portion has a wheel axle cavity for the wheel axle to pass through and a differential cavity for mounting the differential; the wheel axle cavity, the differential mechanism cavity and the rotating shaft of the sun wheel are coaxial.
4. A power plant according to claim 3, characterized in that a part of the wheel axle chamber is located within the rotational axis of the sun wheel; the differential cavity is located within the planet carrier.
5. The power unit of claim 4, wherein the second transmission portion includes a first bearing; the inner ring of the first bearing is fixed, and the wheel shaft penetrates through the inner ring of the first bearing; the rotating shaft of the sun gear is installed on the outer ring of the first bearing.
6. The powerplant of claim 5, wherein the second transmission includes a second bearing, the wheel axle cavity, sun gear, and planet carrier being located between the first and second bearings; the outer ring of the second bearing is fixed, and the rotating shaft of the planet carrier is arranged on the inner ring of the second bearing; the wheel shaft passes through the inner race of the second bearing.
7. The powerplant of claim 6, wherein the differential includes two second planet gears and two side gears, and the two side gears are connected to the wheel axle by internal and external splines; the two second planet wheels are respectively fixed on the axial inner wall of the differential through pin shafts, and each second planet wheel is respectively meshed with the two half shaft gears.
8. The powerplant of claim 2, wherein the diameter of the first gear is less than the diameter of the second gear, and the diameter of the second gear is greater than the diameter of the sun gear.
9. The power plant of claim 2, wherein the motor portion comprises a motor casing and an end cap at an end of the motor casing, the motor casing has a third bearing therein and the end cap has a fourth bearing thereon, and a rotating shaft of the motor portion is mounted to the third bearing and the fourth bearing respectively; the first gear is mounted to an outer side of the fourth bearing.
10. An electric vehicle comprising a wheel axle, characterized in that the electric vehicle further comprises a power plant according to any one of claims 1-9.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201920397798.6U CN209776172U (en) | 2019-03-27 | 2019-03-27 | Power device and electric automobile |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201920397798.6U CN209776172U (en) | 2019-03-27 | 2019-03-27 | Power device and electric automobile |
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| Publication Number | Publication Date |
|---|---|
| CN209776172U true CN209776172U (en) | 2019-12-13 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201920397798.6U Active CN209776172U (en) | 2019-03-27 | 2019-03-27 | Power device and electric automobile |
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| CN (1) | CN209776172U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109910605A (en) * | 2019-03-27 | 2019-06-21 | 苏州汇川联合动力系统有限公司 | Power device and electric car |
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2019
- 2019-03-27 CN CN201920397798.6U patent/CN209776172U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109910605A (en) * | 2019-03-27 | 2019-06-21 | 苏州汇川联合动力系统有限公司 | Power device and electric car |
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Address after: 215000 52 tianedang Road, Yuexi, Wuzhong District, Suzhou City, Jiangsu Province Patentee after: Suzhou Huichuan United Power System Co.,Ltd. Address before: 215000 52 tianedang Road, Yuexi Town, Wuzhong District, Suzhou City, Jiangsu Province Patentee before: SUZHOU HUICHUAN UNITED POWER SYSTEM Co.,Ltd. |