CN213125705U

CN213125705U - Electric drive device

Info

Publication number: CN213125705U
Application number: CN202022127687.9U
Authority: CN
Inventors: 张于于; 夏承钢; 邓华红; 许路
Original assignee: Shanghai Zhongke Shenjiang Electric Vehicle Co Ltd
Current assignee: Shanghai Zhongke Shenjiang Electric Vehicle Co Ltd
Priority date: 2020-09-24
Filing date: 2020-09-24
Publication date: 2021-05-04
Anticipated expiration: 2030-09-24

Abstract

The utility model discloses an electric drive device, include: one end of the first shell is provided with a first cavity, and the other end of the first shell and the second shell form a second cavity; the driving motor is accommodated in the first cavity and comprises a rotor shaft and a rotor bracket, the rotor bracket is sleeved outside the rotor shaft, the first shell is provided with a first boss extending into the rotor bracket, and a first bearing and a second bearing are sleeved on the part, located in the first boss, of the rotor shaft; the differential mechanism is accommodated in the second cavity, one end part of the rotor shaft extends into the shell of the differential mechanism and is sleeved with a third bearing, and one end, far away from the rotor shaft, of the shell of the differential mechanism is further sleeved with a fourth bearing; the intermediate transmission shaft penetrates through the rotor shaft and is connected with the differential; the auxiliary shaft is accommodated in the second cavity, a fifth bearing and a sixth bearing are sleeved at two opposite ends of the auxiliary shaft, and the auxiliary shaft is in driving connection with the rotor shaft and the differential mechanism respectively. The device has high rotation precision of each shaft, and improves NVH performance.

Description

Electric drive device

Technical Field

The utility model relates to an automobile electric drive technical field, concretely relates to electric drive device.

Background

In the existing coaxial electric driving device, six bearings are usually included, two bearings are used for supporting the rotor shaft, two bearings are used for supporting the auxiliary shaft, two bearings are used for supporting the differential shell, the number of the shells or brackets for mounting the bearings is at least four, the coaxiality is difficult to guarantee, and the rotation precision of each shaft and the NVH performance of the device are low. Therefore, it is also desirable to provide an electric drive device having high rotational accuracy and high NVH (english abbreviation for Noise, Vibration, and Harshness) performance.

SUMMERY OF THE UTILITY MODEL

In view of the above problems in the prior art, it is an object of the present invention to provide an electric drive device that requires only two housings and has high rotational accuracy of each shaft and relatively high NVH performance of the device.

The specific technical scheme is as follows:

an electric drive device, consisting essentially of: the device comprises a first shell, a second shell, a driving motor, an intermediate transmission shaft, a differential and an auxiliary shaft;

a first cavity is formed in one end of the first shell, and a second cavity is formed by the other end of the first shell and the second shell;

the driving motor is accommodated in the first cavity and comprises a rotor shaft and a rotor bracket, the rotor bracket is sleeved outside the rotor shaft, the first shell is provided with a first boss extending into the rotor bracket, and a first bearing and a second bearing are sleeved on the part, located in the first boss, of the rotor shaft;

the differential mechanism is accommodated in the second cavity, one end part of the rotor shaft extends into the shell of the differential mechanism and is sleeved with a third bearing, and one end, far away from the rotor shaft, of the shell of the differential mechanism is further sleeved with a fourth bearing;

the intermediate transmission shaft penetrates through the rotor shaft and is connected with the differential;

the auxiliary shaft is accommodated in the second cavity, a fifth bearing and a sixth bearing are sleeved at two opposite ends of the auxiliary shaft, and the auxiliary shaft is in driving connection with the rotor shaft and the differential mechanism respectively.

In an electric drive of the above-mentioned type, there is also the feature that the electric drive further includes a first gear fitted over the rotor shaft between the second bearing and the third bearing.

In an electric drive device as described above, further characterized in that the electric drive device further includes a second gear that is fitted to an end of the counter shaft near the first housing, the second gear being in meshing transmission with the first gear.

In the above-described electric drive device, there is a further feature that the first housing is further provided with a second boss provided on the first housing and extending toward the second gear, and the fifth bearing is accommodated in the second boss.

In an electric drive device of the above-mentioned type, it is further characterized in that the second housing is further provided with a fourth boss located on a side of the second gear facing away from the first housing, and the fifth bearing is accommodated in the fourth boss.

In an electric drive of the above-mentioned type, it is further characterized in that the electric drive further includes a third gear wheel that is fitted over an end of the countershaft remote from the first housing.

In an electric drive device as described above, further characterized in that the electric drive device further includes a fourth gear that is fitted over the housing of the differential and is located near the fourth bearing, and the fourth gear is in meshing transmission with the third gear.

In the above electric driving device, the driving motor further includes a stator and a rotor, the rotor is sleeved outside the rotor bracket, and the stator is coaxially disposed outside the rotor.

In the above-described electric drive device, the first housing may be provided with a third boss, the third boss may be coaxially disposed outside the first boss, the third boss and the first boss may be located on the same side of the first housing, and the rotor and the stator may be accommodated between the third boss and the first boss.

In an electric drive device of the above-mentioned type, there is a further feature that a side of the first housing remote from the first cavity is fixed to the second housing by a fastener.

The positive effects of the technical scheme are as follows:

the utility model provides a pair of electric drive device installs six bearings on two casings, and wherein three bearing is installed on the rotor shaft to whole electric drive device's rotation precision and NVH performance have been improved.

Drawings

Fig. 1 is a schematic structural diagram of an electric drive device according to a first embodiment of the present invention;

fig. 2 is a schematic structural diagram of an electric drive device according to a second embodiment of the present invention.

In the drawings: 1. a first housing; 11. a first boss; 12. a third boss; 13. a first cavity; 14. a second boss; 2. a second housing; 21. a second cavity; 22. a fourth boss; 23. a fifth boss; 3. a drive motor; 31. a stator; 32. a rotor; 33. a rotor bracket; 34. a rotor shaft; 4. a differential mechanism; 41. a differential housing; 411. mounting holes; 5. an intermediate transmission shaft; 61. a first bearing; 62. a second bearing; 63. a third bearing; 64. a fourth bearing; 65. a fifth bearing; 66. a sixth bearing; 7. a counter shaft; 81. a first gear; 82. a second gear; 83. a third gear; 84. a fourth gear; 9. a fastener.

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 by the following embodiments in combination with the accompanying drawings. It should be understood that the specific embodiments described herein are for purposes of illustration only and are not intended to limit the invention.

The numbering of the components themselves, such as "first", "second", etc., is used herein only to distinguish between the objects depicted and not to have any sequential or technical meaning. The term "connected" and "coupled" when used in this application, unless otherwise indicated, includes both direct and indirect connections (couplings). In the description of the present invention, it is to be understood that the terms "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience of description and simplicity of description, and do not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore, should not be construed as limiting the present invention.

In the present application, unless expressly stated or limited otherwise, the first feature may be directly on or directly under the second feature or indirectly via intermediate members. Also, a first feature "on," "over," and "above" a second feature may be directly or diagonally above the second feature, or may simply indicate that the first feature is at a higher level than the second feature. A first feature being "under," "below," and "beneath" a second feature may be directly under or obliquely under the first feature, or may simply mean that the first feature is at a lesser elevation than the second feature.

Referring to fig. 1, fig. 1 is a schematic structural diagram of an electric driving device according to a first embodiment of the present invention. The utility model discloses an electric drive device, this electric drive device includes: a first housing 1, a second housing 2, a drive motor 3, an intermediate transmission shaft 5, a differential 4, and a counter shaft 7.

The middle transmission shaft 5 penetrates through the first shell 1 and the second shell 2, and two ends of the middle transmission shaft 5 respectively extend out of the first shell 1 and the second shell 2.

One end of the first shell 1 is provided with a first cavity 13, and the other end and the second shell 2 enclose a second cavity 21.

Specifically, the side of the first housing 1 away from the first cavity 13 is fixed with the second housing 2 by the fastener 9.

The drive motor 3 is accommodated in the first cavity 13.

The drive motor 3 includes a stator 31, a rotor 32, a rotor shaft 34, and a rotor bracket 33.

The rotor bracket 33 is sleeved outside the rotor shaft 34.

The first shell 1 is provided with a first boss 11 extending into the rotor bracket 33, and a first bearing 61 and a second bearing 62 are sleeved on the part of the rotor shaft 34 positioned in the first boss 11; specifically, the inner diameters of the first bearing 61 and the second bearing 62 are adapted to the outer diameter of the rotor shaft 34, and the outer diameters of the first bearing 61 and the second bearing 62 are adapted to the inner cavity of the first boss 11. The first bearing 61 and the second bearing 62 are used to support the rotor shaft 34.

The rotor 32 is fitted around the rotor bracket 33, and the stator 31 is coaxially disposed outside the rotor 32.

Further, the first housing 1 is provided with a third boss 12, the third boss 12 is coaxially disposed outside the first boss 11, the third boss 12 and the first boss 11 are located on the same side of the first housing 1, and the rotor 32 and the stator 31 are accommodated between the third boss 12 and the first boss 11.

Specifically, the stator 31 and the rotor 32 are installed in a cavity formed by the third boss 12 and the first boss 11, the diameter of the stator 31 is matched with the diameter of an inner cavity of the third boss 12, the outer diameter and the length of the third boss 12 are both larger than those of the first boss 11, namely, the first boss 11 is accommodated in the third boss 12.

The differential 4 is accommodated in the second cavity 21, and the differential 4 includes a differential case 41.

One end of the rotor shaft 34 extends into the differential case 41 and is fitted with a third bearing 63 to support the end of the differential case 41, and one end of the differential case 41 remote from the rotor shaft 34 is also fitted with a fourth bearing 64.

Specifically, the end portion of the differential case 41 is provided with a mounting hole 411 for mounting the third bearing 63, the inner diameter of the mounting hole 411 is fitted to the outer diameter of the third bearing 63, and the third bearing 63 is accommodated in the mounting hole 411.

Specifically, the second case 2 is provided with a fifth boss 23 that protrudes into the second cavity 21 and toward the differential case 41, and the fourth bearing 64 is accommodated in the fifth boss 23. The inner diameter of the fifth boss 23 is adapted to the outer diameter of the fourth bearing 64.

The third bearing 63 and the fourth bearing 64 are used to support the differential case 41.

The intermediate drive shaft 5 is inserted through the rotor shaft 34 and connected to the differential 4.

The secondary shaft 7 is housed in the second cavity 21, the opposite ends of the secondary shaft 7 being fitted with a fifth bearing 65 and a sixth bearing 66. The fifth bearing 65 and the sixth bearing 66 are used to support the countershaft 7. The auxiliary shaft 7 is in driving connection with the rotor shaft 34 and the differential 4, respectively.

In the electric drive device in the embodiment, the first bearing 61 and the second bearing 62 are arranged on the same shell (the first shell 1), so that two bearing holes can be clamped and machined at one time, and the first bearing 61 and the second bearing 62 are arranged on the same shaft, namely the rotor shaft 34, so that the rotation precision of the rotor shaft 34 is high;

the third bearing 63 is installed at one shaft end of the rotor shaft 34, and shares a shaft with the first bearing 61 and the second bearing 62, so that the rotation accuracy of the first bearing 61, the second bearing 62, the third bearing 63 and the rotor shaft 34 is also improved, the bearing hole of the fifth bearing 65 is formed in the first housing 1, and the bearing hole and the two bearing holes for installing the first bearing 61 and the second bearing 62 are formed in the same housing, so that the parallelism between the rotor shaft 34 and the auxiliary shaft 7 is better, and the rotation accuracy of the two shafts is higher. The bearing holes of the sixth bearing 66 and the fourth bearing 64 are formed in the second housing 2, so that the parallelism between the differential housing 41 and the auxiliary shaft 7 can be well guaranteed, the rotation precision of the two shafts is high, and the NVH performance is improved.

Further, the electric drive device further comprises a first gear 81, a second gear 82, a third gear 83 and a fourth gear 84.

The first gear 81 is fitted over the rotor shaft 34 and is located between the second bearing 62 and the third bearing 63. Alternatively, the first gear 81 may be sleeved on the rotor shaft 34 through a spline or the like, or may be integrally formed with the rotor shaft 34, that is, the rotor shaft 34 is a gear shaft, which is not limited thereto. When the rotor shaft 34 is a gear shaft, assembly errors of the two parts and noise and vibration generated thereby are eliminated, and NVH performance is improved.

The second gear 82 is sleeved at one end of the countershaft 7 close to the first shell 1, and the second gear 82 is in meshing transmission with the first gear 81. Alternatively, the second gear 82 may be sleeved on the countershaft 7 through a spline or the like, or may be integrally formed with the countershaft 7, that is, the countershaft 7 is a gear shaft, and is not limited thereto. When the auxiliary shaft 7 is a gear shaft, assembly errors of two parts and noise and vibration generated by the assembly errors are eliminated, and NVH performance is improved.

Further, the first housing 1 is further provided with a second boss 14, the second boss 14 is arranged on the first housing 1 and extends to the second gear 82, and the fifth bearing 65 is accommodated in the second boss 14. The inner diameter of the bearing hole of the second boss 14 is matched with the outer diameter of the fifth bearing 65.

The third gear 83 is fitted on the end of the counter shaft 7 remote from the first housing 1. Alternatively, the third gear 83 may be spline-fitted to the counter shaft 7 or integrally gear-shaft-made with the counter shaft 7, without being limited thereto. When the auxiliary shaft 7 is a gear shaft, assembly errors of two parts and noise and vibration generated by the assembly errors are eliminated, and NVH performance is improved.

The fourth gear 84 is sleeved on the differential case 41 and close to the fourth bearing 64, and the fourth gear 84 is in meshed transmission with the third gear 83. Alternatively, the fourth gear 84 may be sleeved and fixed to the differential case 41 by bolts, or may be formed integrally with the differential case 41, without being limited thereto. When the differential case 41 is a gear shaft, assembly errors of both parts and noise and vibration generated therefrom are eliminated, improving NVH performance.

Referring to fig. 2, fig. 2 is a schematic structural diagram of an electric driving device according to a second embodiment of the present invention.

The electric drive in this embodiment differs from the electric drive in the first embodiment described above in that in this embodiment, the second boss 14 is not provided on the first housing 1, but the fourth boss 22 is provided on the second housing 2, the fourth boss 22 is located on the side of the second gear 82 facing away from the first housing 1, and the fifth bearing 65 is accommodated in the fourth boss 22. The bearing bore inner diameter of the fourth boss 22 is matched with the outer diameter of the fifth bearing 65. Other structures are the same as those of the first embodiment, and reference may be made to the first embodiment, which is not repeated herein.

In the present embodiment, both bearings (i.e., the first bearing 61 and the second bearing 62) on the rotor shaft 34 are disposed on the first housing 1, both bearings (the fifth bearing 65 and the sixth bearing 66) of the counter shaft 7 are disposed on the second housing 2, the rotational accuracy of the rotor shaft 34 and the counter shaft 7 is improved, one bearing (the third bearing 63) of the differential 4 is disposed on the rotor shaft 34 of which the rotational accuracy is improved, and the other bearing (the fourth bearing 64) is disposed on the second housing 2, thereby improving the NVH performance of the electric drive device. And rotor shaft 34, countershaft 7 and differential case 41 all adopt integrative gear shaft, can further improve the NVH performance of device greatly.

The technical features of the above embodiments can be arbitrarily combined, and for the sake of brevity, all possible combinations of the technical features in the above embodiments are not described, but should be considered as the scope of the present specification as long as there is no contradiction between the combinations of the technical features.

The above examples only represent some embodiments of the present invention, and the description thereof is more specific and detailed, but not to be construed as limiting the scope of the present invention. It should be noted that, for those skilled in the art, without departing from the spirit of the present invention, several variations and modifications can be made, which are within the scope of the present invention. Therefore, the protection scope of the present invention should be subject to the appended claims.

Claims

1. An electric drive device, comprising: the device comprises a first shell, a second shell, a driving motor, an intermediate transmission shaft, a differential and an auxiliary shaft;

2. The electric drive of claim 1 further comprising a first gear disposed on said rotor shaft between said second bearing and said third bearing.

3. The electric drive of claim 2 further comprising a second gear disposed about an end of said countershaft proximate said first housing, said second gear in meshing engagement with said first gear.

4. The electric drive of claim 3 wherein said first housing is further provided with a second boss disposed on said first housing and extending toward said second gear, said fifth bearing being received in said second boss.

5. An electric drive device according to claim 3, characterized in that the second housing is further provided with a fourth boss on a side of the second gear wheel facing away from the first housing, the fifth bearing being accommodated in the fourth boss.

6. An electric drive device according to any one of claims 4 or 5, characterized in that the electric drive device further comprises a third gear wheel, which is fitted on an end of the countershaft remote from the first housing.

7. The electric drive of claim 6 further comprising a fourth gear disposed on the housing of the differential and proximate the fourth bearing, the fourth gear being in meshing engagement with the third gear.

8. The electric drive device of claim 7, wherein said drive motor further comprises a stator and a rotor, said rotor being disposed outside said rotor bracket, said stator being disposed coaxially outside said rotor.

9. The electric drive device of claim 8 wherein said first housing is provided with a third boss coaxially disposed outside said first boss, and said third boss and said first boss are on the same side of said first housing, said rotor and said stator being received between said third boss and said first boss.

10. The electric drive of claim 9 wherein a side of the first housing remote from the first cavity is secured to the second housing by a fastener.