CN217607636U

CN217607636U - Electric drive device

Info

Publication number: CN217607636U
Application number: CN202221634011.1U
Authority: CN
Inventors: 张于于; 夏承钢; 孙妍妍; 孙江明
Original assignee: Shanghai Zhongke Shenjiang Electric Vehicle Co Ltd
Current assignee: Shanghai Zhongke Shenjiang Electric Vehicle Co Ltd
Priority date: 2022-06-28
Filing date: 2022-06-28
Publication date: 2022-10-18
Anticipated expiration: 2032-06-28

Abstract

The utility model relates to an electric drive device, including driving motor, differential mechanism, first countershaft and second countershaft, driving motor include rotor and rotor shaft, differential mechanism include the differential mechanism casing, the rotor suit on the rotor shaft, the device still include first bearing and the second bearing that is used for supporting the rotor shaft, be used for supporting the third bearing and the fourth bearing of differential mechanism casing, be used for supporting fifth bearing and the sixth bearing of first countershaft, be used for supporting seventh bearing and the eighth bearing of second countershaft; the power of the rotor shaft is transmitted to the differential case through the first countershaft and the second countershaft at the same time. Adopted the utility model discloses an electric drive device has adopted two countershafts to transmit the differential mechanism casing through first countershaft and second countershaft simultaneously with the power of rotor shaft to make electric drive device just can ensure the NVH performance by the high-power driving motor of adaptation under the prerequisite that rotor shaft and output gear only supported by two bearings.

Description

Electric drive device

Technical Field

The utility model relates to a vehicle drive transmission technical field especially relates to the shaft type electric drive device field of parallel, specifically indicates an electric drive device.

Background

In existing parallel shaft electric drives, the rotor shaft output torque is typically up to 350Nm, with a speed in excess of 12000rpm. With the further increase of the vehicle power performance demand, the output torque and the rotation speed of the drive motor will be further increased. Usually, the rotor shaft is supported by only two bearings, an output gear is arranged at the shaft end of the rotor shaft, a main shaft in a transmission is eliminated, and the gear on the rotor shaft is suspended outside the bearings, so that the supporting mode simplifies the structure and the assembling mode.

However, as the rotation speed and torque of the driving motor are further increased, the supporting manner of the rotor shaft faces the problems of bearing capacity and NVH, on one hand, it is difficult to select a proper high-speed bearing to meet the requirement of increased axial force, and on the other hand, the increasing NVH performance also hopes to further increase the contact ratio of the gear pair, and therefore, the increasing gear helix angle brings the problem of larger axial force. Accordingly, it is also desirable to provide an electric drive device that is compatible with a high-power drive motor and that can ensure NVH performance on the premise that the rotor shaft and its output gear are supported by only two bearings.

SUMMERY OF THE UTILITY MODEL

The utility model aims at overcoming the shortcoming of above-mentioned prior art, providing a satisfy simple structure, good performance, application scope comparatively extensive electric drive device.

In order to achieve the above object, the electric drive device of the present invention is as follows:

the electric driving device is mainly characterized by comprising a driving motor, a differential, a first auxiliary shaft and a second auxiliary shaft, wherein the driving motor comprises a rotor and a rotor shaft, the differential comprises a differential shell, the rotor is sleeved on the rotor shaft, the device further comprises a first bearing and a second bearing for supporting the rotor shaft, a third bearing and a fourth bearing for supporting the differential shell, a fifth bearing and a sixth bearing for supporting the first auxiliary shaft, a seventh bearing and an eighth bearing for supporting the second auxiliary shaft; the power of the rotor shaft is transmitted to the differential case through the first countershaft and the second countershaft at the same time.

Preferably, the apparatus further comprises a first gear and a second gear, the first gear and the second gear being disposed adjacent the rotor shaft and adjacent the second bearing.

Preferably, the device further comprises a third gear and a fourth gear, the third gear is sleeved on the first countershaft and close to the fifth bearing, the third gear is in meshing transmission with the first gear, and the fourth gear is arranged on the first countershaft and close to the sixth bearing.

Preferably, the device further comprises a fifth gear and a sixth gear, the fifth gear is sleeved on the second countershaft and close to the seventh bearing, the fifth gear is in meshing transmission with the second gear, and the sixth gear is arranged on the second countershaft and close to the eighth bearing.

Preferably, the device further comprises a seventh gear and an eighth gear, the seventh gear and the eighth gear are arranged on the shell of the differential and are close to the third bearing, the seventh gear and the fourth gear are in meshed transmission, and the eighth gear and the sixth gear are in meshed transmission.

Preferably, the first gear and the second gear have opposite rotation directions.

Preferably, the seventh gear and the fourth gear have opposite rotation directions, and the eighth gear and the sixth gear have opposite rotation directions.

Preferably, said first and second secondary shafts are arranged symmetrically with respect to the plane formed by the axis of the rotor shaft and the axis of the differential.

Adopted the utility model discloses an electric drive device has adopted two countershafts to transmit the differential mechanism casing through first countershaft and second countershaft simultaneously with the power of rotor shaft to make electric drive device just can ensure the NVH performance by the high-power driving motor of adaptation under the prerequisite that rotor shaft and output gear only supported by two bearings.

Drawings

Fig. 1 is a schematic perspective view of an electric drive device according to the present invention.

Fig. 2 is a front view of the electric driving device of the present invention.

Fig. 3 is a schematic side view of the electric driving device of the present invention.

Reference numerals are as follows:

1. driving motor

2. Differential gear

11. Rotor

12. Rotor shaft

21. Differential housing

22. Second bearing

31. First secondary shaft

32. Second auxiliary shaft

41. First gear

42. Second gear

43. Third gear

44. Fourth gear

45. Fifth gear

46. Sixth gear

47. Seventh gear

48. Eighth gear

51. First bearing

52. Second bearing

53. Third bearing

54. Fourth bearing

55. Fifth bearing

56. Sixth bearing

57. Seventh bearing

58. Eighth bearing

Detailed Description

In order to more clearly describe the technical content of the present invention, the following further description is given with reference to specific embodiments.

As shown in fig. 1 and fig. 2, the electric driving device of the present invention includes a driving motor 1, which includes a rotor 11 and a rotor shaft 12, wherein the rotor 11 is sleeved on the rotor shaft 12; a differential 2 including a differential case 21; a first countershaft 31; a second counter shaft 32; a first bearing 51 and a second bearing 52 for supporting the rotor shaft 12; a third bearing 53 and a fourth bearing 54 for supporting the differential case 21; fifth and

sixth bearings

55 and 56 for supporting the first sub-shaft 31; a seventh bearing 57 and an eighth bearing 58 for supporting the second sub-shaft 32; the power of the rotor shaft 12 is transmitted to the differential case 21 through the first countershaft 31 and the second countershaft 32 at the same time.

Preferably, a first gear 41 and a second gear 42 are also included, the first gear 41 and the second gear 42 being disposed adjacent to the rotor shaft 12 and proximate to the second bearing 52. The first gear 41 and the second gear 42 may be sleeved on the rotor shaft 12 by a spline or the like, or may be integrally formed with the rotor shaft 12, that is, the rotor shaft 12 is a gear shaft, which is not limited thereto.

Preferably, the rotation directions of the first gear 41 and the second gear 42 are opposite. The first gear 41 and the second gear 42 are arranged on the rotor shaft 12 in a basically close manner, and when the rotating directions of the first gear and the second gear are opposite, axial force generated in meshing transmission can be basically counteracted, so that the working load of the bearing is greatly reduced, and particularly, good working conditions are created for the close second bearing 52, namely, although the working rotating speed of the second bearing 52 is high, the working load is mainly radial load formed by the combination of radial force and tangential force of the gears, and therefore, a proper high-speed bearing can be easily selected.

On the other hand, the first gear 41 and the second bearing 52 can adopt a tooth profile design with a larger helix angle, the limit of axial force is not considered too much, the contact ratio of the gear pair is improved to be more than 4.2, and the NVH performance of the electric driving device is improved.

Preferably, a third gear 43 and a fourth gear 44 are further included, the third gear 43 being mounted on the first countershaft 31 adjacent to a fifth bearing 55, the third gear 43 being in meshing engagement with the first gear 41, and the fourth gear 44 being mounted on the first countershaft 31 adjacent to a sixth bearing 56. The fourth gear 44 may be fitted to the first counter shaft 31 by a spline or the like, or may be formed integrally with the first counter shaft 31, that is, the first counter shaft 31 is a gear shaft, but is not limited thereto. Normally, the two gears on the layshaft are arranged with the same handedness so that the axial forces on the two gears can cancel a part, so that the handedness of the third gear 43 is opposite to that of the first gear 41 and the handedness of the fourth gear 44 is the same as that of the third gear 43.

Preferably, a fifth gear 45 and a sixth gear 46 are also included, the fifth gear 45 being nested on the second countershaft 32 and adjacent to the seventh bearing 57, the fifth gear 45 being in meshing engagement with the second gear 42, the sixth gear 46 being disposed on the second countershaft 32 and adjacent to the eighth bearing 58. The sixth gear 46 may be sleeved on the second counter shaft 32 by a spline or the like, or may be formed integrally with the second counter shaft 32, that is, the second counter shaft 32 is a gear shaft, which is not limited thereto. Similarly, the rotation direction of the fifth gear 45 is opposite to that of the second gear 42, and the rotation direction of the sixth gear 46 is the same as that of the fifth gear 45.

Preferably, seventh and

eighth gears

47, 48 are also included, seventh and

eighth gears

47, 48 being disposed on the housing of differential 2 proximate third bearing 53, seventh gear 47 being in meshing engagement with fourth gear 44, and eighth gear 48 being in meshing engagement with sixth gear 46. The seventh gear 47 and the eighth gear 48 may be sleeved and fixed to the case of the differential 2 by bolts, or may be formed integrally with the case of the differential 2, without being limited thereto.

Similarly, the seventh gear 47 is opposite in rotation to the fourth gear 44, and the eighth gear 48 is opposite in rotation to the sixth gear 46. Therefore, the rotation direction of the seventh gear 47 is the same as that of the first gear 41, the rotation direction of the eighth gear 48 is the same as that of the second gear 42, and the axial forces on the seventh gear 47 and the eighth gear 48 can be substantially cancelled out on the condition that the rotation direction of the first gear 41 is opposite to that of the second gear 42, so that the workload of the third bearing 53 is directly reduced, and the workload of the fourth bearing 54 is indirectly reduced.

Generally, the first gear 41 and the second gear 42 are arranged to be gears with the same parameters except for the opposite rotation direction, and the third gear 43 and the fourth gear 44 are also arranged to be gears with the same parameters except for the opposite rotation direction, so that the axial forces generated when the gears are in meshing transmission are equal but can be basically cancelled out due to the opposite directions. It is also possible to arrange the fifth gear 45 and the sixth gear 46 as gears of the same parameters, except for the opposite direction of rotation, and the seventh gear 47 and the eighth gear 48 as gears of the same parameters, except for the opposite direction of rotation, to obtain the same effect of substantial cancellation of axial forces, ensuring good load conditions for the bearings, and thus also allowing the use of smaller bearings.

As shown in fig. 3, the first sub-shaft 31 and the second sub-shaft 32 are arranged symmetrically with respect to a plane P formed by the axis A1 of the rotor shaft 12 and the axis A2 of the differential 2. Therefore, when the housing is machined, the bearing hole centers of the third bearing 53 or the fourth bearing 54 supporting the differential 2 can be used as a reference, and the bearing holes of the fifth bearing 55 and the seventh bearing 57, or the bearing holes of the sixth bearing 56 and the second bearing 58 can be machined by rotating a certain angle, so that clamping is simplified, and machining accuracy is improved.

For a specific implementation of this embodiment, reference may be made to the relevant description in the above embodiments, which is not described herein again.

It is understood that the same or similar parts in the above embodiments may be mutually referred to, and the same or similar parts in other embodiments may be referred to for the content which is not described in detail in some embodiments.

It should be noted that, in the description of the present invention, the terms "first", "second", etc. are used for descriptive purposes only and are not to be construed as indicating or implying relative importance. In addition, in the description of the present invention, the meaning of "a plurality" means at least two unless otherwise specified.

In the description herein, references to the description of the term "one embodiment," "some embodiments," "an example," "a specific example," or "some examples," etc., mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, the schematic representations of the terms used above do not necessarily refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.

In this specification, the invention has been described with reference to specific embodiments thereof. It will, however, be evident that various modifications and changes may be made thereto without departing from the broader spirit and scope of the invention. The specification and drawings are, accordingly, to be regarded in an illustrative rather than a restrictive sense.

Claims

1. An electric drive device comprising a drive motor, a differential, a first countershaft and a second countershaft, said drive motor including a rotor and a rotor shaft, said differential including a differential housing, said rotor journalled on said rotor shaft, said device further comprising first and second bearings for supporting said rotor shaft, third and fourth bearings for supporting said differential housing, fifth and sixth bearings for supporting said first countershaft, and seventh and eighth bearings for supporting said second countershaft; the power of the rotor shaft is transmitted to the differential case through the first countershaft and the second countershaft at the same time.

2. The electric drive of claim 1 further comprising a first gear and a second gear, said first gear and said second gear being disposed adjacent to said rotor shaft and adjacent to said second bearing.

3. The electric drive of claim 2 further comprising a third gear mounted on the first countershaft adjacent the fifth bearing, the third gear in meshing engagement with the first gear, and a fourth gear mounted on the first countershaft adjacent the sixth bearing.

4. The electric drive of claim 3 further comprising a fifth gear mounted on the second countershaft proximate the seventh bearing, the fifth gear in meshing engagement with the second gear, and a sixth gear mounted on the second countershaft proximate the eighth bearing.

5. The electric drive of claim 4 further comprising seventh and eighth gears disposed on the housing of the differential adjacent the third bearing, said seventh gear in meshing engagement with the fourth gear and said eighth gear in meshing engagement with the sixth gear.

6. The electric drive of claim 2 wherein said first and second gears have opposite rotational directions.

7. The electric drive of claim 5 wherein the seventh gear is opposite to the fourth gear in rotation and the eighth gear is opposite to the sixth gear in rotation.

8. An electric drive device according to claim 1, characterized in that the first and second secondary shafts are arranged symmetrically with respect to a plane formed by the axis of the rotor shaft and the axis of the differential.