CN216969344U

CN216969344U - Electric drive device

Info

Publication number: CN216969344U
Application number: CN202220770924.XU
Authority: CN
Inventors: 张于于; 夏承钢; 赵瑞宽; 赵继龙; 谢作双; 刘新德; 孙江明
Original assignee: Shanghai Zhongke Shenjiang Electric Vehicle Co Ltd
Current assignee: Shanghai Zhongke Shenjiang Electric Vehicle Co Ltd
Priority date: 2022-04-06
Filing date: 2022-04-06
Publication date: 2022-07-15
Anticipated expiration: 2032-04-06

Abstract

The utility model relates to an electric driving device which comprises a driving motor, a differential, an intermediate transmission shaft, a first auxiliary shaft, a second auxiliary shaft, a first bearing, a second bearing, a third bearing, a fourth bearing, a fifth bearing, a sixth bearing and a seventh bearing. By adopting the electric driving device, the defects of the prior art are overcome, and the double-intermediate-shaft transmission is adopted, so that an intermediate support shell is not required to be arranged between the differential mechanism and the rotor shaft, the shell structure is simplified, and the assembly is convenient.

Description

Electric drive device

Technical Field

The utility model relates to the technical field of vehicle driving transmission, in particular to the field of coaxial electric driving devices, and particularly relates to an electric driving device.

Background

In the existing coaxial electric drive device, two bearings are usually provided for supporting the rotor shaft, two bearings are provided for supporting the differential, and an intermediate housing is provided between the rotor shaft and the differential housing for supporting the rotor shaft and the differential, which increases the structural complexity and is disadvantageous for assembly. It is therefore also desirable to provide an electric drive system having a housing that is simple in construction and easy to assemble.

SUMMERY OF THE UTILITY MODEL

The utility model aims to overcome the defects of the prior art and provide an electric driving device which is simple in structure, convenient to assemble and wide in application range.

To achieve the above object, the electric drive device of the present invention is as follows:

the electric driving device is mainly characterized in that the device comprises a driving motor, a differential mechanism, an intermediate transmission shaft, a first auxiliary shaft, a second auxiliary shaft, a first bearing, a second bearing, a third bearing, a fourth bearing, a fifth bearing, a sixth bearing and a seventh bearing, the driving motor comprises an annular rotor, a stator and a rotor shaft, the annular rotor is coaxially arranged in the inner cavity of the stator, the annular rotor is sleeved on the rotor shaft, the intermediate transmission shaft is arranged in the inner cavity of the rotor shaft in a penetrating way, one end of the intermediate transmission shaft is connected with the differential mechanism, the first bearing and the second bearing support the rotor shaft, the third bearing supports the housing of the differential, the fourth bearing and the fifth bearing support a first auxiliary shaft, the sixth bearing and the seventh bearing support a second auxiliary shaft, and the first auxiliary shaft and the second auxiliary shaft are symmetrically arranged.

Preferably, the differential includes a differential case, the differential case and the rotor shaft are supported by a third bearing, a second bearing and a first bearing, the second bearing is disposed on the differential case, an inner ring of the second bearing is sleeved on the rotor shaft, and an outer ring of the second bearing is mounted in a bearing hole formed in the differential case.

Preferably, the device further comprises a first gear and a second gear, the first gear and the second gear are sleeved on the rotor shaft and are arranged side by side, the first gear and the second gear are located between the second bearing and the annular rotor, the rotating directions of the first gear and the second gear are opposite, and the first gear and the second gear are arranged close to the rotor shaft.

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

Preferably, the device further comprises a fifth gear and a sixth gear, the fifth gear is sleeved on the second countershaft and is close to the sixth bearing, the fifth gear is in meshing transmission with the second gear, the sixth gear is sleeved on the second countershaft and is close to the seventh bearing, and the rotating directions of the fifth gear and the sixth gear are the same.

Preferably, the device further comprises a seventh gear and an eighth gear, the seventh gear and the eighth gear are arranged side by side, the seventh gear is sleeved on the shell of the differential and close to the second bearing, the seventh gear is in meshing transmission with the fourth gear, the eighth gear is sleeved on the shell of the differential and close to the third bearing, the eighth gear is in meshing transmission with the sixth gear, and the rotation directions of the seventh gear and the eighth gear are opposite.

Preferably, the first gear and the second gear are sleeved on the rotor shaft through splines or the like, or are integrally manufactured with the rotor shaft; the fourth gear is sleeved on the first auxiliary shaft through a spline and the like or is integrally manufactured with the first auxiliary shaft; the sixth gear is sleeved on the second auxiliary shaft through a spline and the like or is integrally manufactured with the second auxiliary shaft; the seventh gear and the eighth gear are sleeved and fixedly connected to a shell of the differential through bolts.

By adopting the electric driving device, the defects of the prior art are overcome, and the double-intermediate-shaft transmission is adopted, so that an intermediate support shell is not required to be arranged between the differential mechanism and the rotor shaft, the shell structure is simplified, and the assembly is convenient.

Drawings

Fig. 1 is a schematic view of the structure of an electric drive device of the present invention.

Fig. 2 is a schematic view of seventh and eighth gears of the electric drive device of the present invention.

Reference numerals:

1 drive motor

2 differential mechanism

11 annular rotor

12 stator

13 rotor shaft

21 differential case

31 first countershaft

32 second countershaft

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

Detailed Description

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

The electric drive device comprises a drive motor 1, a differential 2, a middle transmission shaft, a first auxiliary shaft 31, a second auxiliary shaft 32, a first bearing 51, a second bearing 52, a third bearing 53, a fourth bearing 54, a fifth bearing 55, a sixth bearing 56 and a seventh bearing 57, wherein the drive motor 1 comprises an annular rotor 11, a stator 12 and a rotor shaft 13, the annular rotor 11 is coaxially arranged in an inner cavity of the stator 12, the annular rotor 11 is sleeved on the rotor shaft 13, the differential 2 comprises a differential shell 21, the middle transmission shaft is arranged in an inner cavity of the rotor shaft 13 in a penetrating way, one end of the middle transmission shaft is connected with the differential 2, the first bearing 51 and the second bearing 52 support the rotor shaft 13, the third bearing 53 supports the shell of the differential 2, the fourth bearing 54 and the fifth bearing 55 support the first auxiliary shaft 31, the sixth bearing 56 and the seventh bearing 57 support the second sub-shaft 32, and the first sub-shaft 31 and the second sub-shaft 32 are symmetrically arranged.

In a preferred embodiment of the present invention, the differential 2 includes a differential case 21, the differential case 21 and the rotor shaft 13 are supported by a third bearing 53, a second bearing 52 and a first bearing 51, the second bearing 52 is disposed on the differential case 21, an inner ring of the second bearing 52 is sleeved on the rotor shaft 13, and an outer ring of the second bearing 52 is mounted in a bearing hole formed in the differential case 21.

As a preferred embodiment of the present invention, the device further includes a first gear 41 and a second gear 42, the first gear 41 and the second gear 42 are sleeved on the rotor shaft 13 and arranged side by side, the first gear 41 and the second gear 42 are both located between the second bearing 52 and the annular rotor 11, the rotation directions of the first gear 41 and the second gear 42 are opposite, and the first gear 41 and the second gear 42 are both installed and disposed close to the rotor shaft 13.

As a preferred embodiment of the present invention, the device further comprises a third gear 43 and a fourth gear 44, the third gear 43 is sleeved on the first counter shaft 31 and is close to the fourth bearing 54, the third gear 43 is in meshing transmission with the first gear 41, the fourth gear 44 is sleeved on the first counter shaft 31 and is close to the fifth bearing 55, and the rotation directions of the third gear 43 and the fourth gear 44 are the same.

In a preferred embodiment of the present invention, the device further includes a fifth gear 45 and a sixth gear 46, the fifth gear 45 is sleeved on the second auxiliary shaft 32 and is close to the sixth bearing 56, the fifth gear 45 is in mesh transmission with the second gear 42, the sixth gear 46 is sleeved on the second auxiliary shaft 32 and is close to the seventh bearing 57, and the rotation directions of the fifth gear 45 and the sixth gear 46 are the same.

As a preferred embodiment of the present invention, the device further includes a seventh gear 47 and an eighth gear 48, the seventh gear 47 and the eighth gear 48 are arranged side by side, the seventh gear 47 is sleeved on the housing of the differential 2 and is close to the second bearing 52, the seventh gear 47 is in mesh transmission with the fourth gear 44, the eighth gear 48 is sleeved on the housing of the differential 2 and is close to the third bearing 53, the eighth gear 48 is in mesh transmission with the sixth gear 46, and the rotation directions of the seventh gear 47 and the eighth gear 48 are opposite.

As a preferred embodiment of the present invention, the first gear 41 and the second gear 42 are sleeved on the rotor shaft 13 by a spline or the like, or are integrally formed with the rotor shaft 13; the fourth gear 44 is sleeved on the first countershaft 31 through a spline or the like, or is integrally formed with the first countershaft 31; the sixth gear 46 is sleeved on the second countershaft 32 through a spline or the like, or is integrally formed with the second countershaft 32; the seventh gear 47 and the eighth gear 48 are sleeved and fixed to the differential case 21 by bolts.

As in the electric drive device shown in fig. 1, the first sub-shaft 31 and the second sub-shaft 32 are arranged symmetrically so that the electric drive device is arranged symmetrically both in front and rear, so that the front-rear position center of gravity is on the axis of the rotor shaft 13 to eliminate the vibration problem caused by asymmetry. Avoid the vehicle to shake and nod, improve travelling comfort and stability.

As shown in fig. 2, the differential case 21 and the rotor shaft 13 are supported only by three bearings of the third bearing 53, the second bearing 52 and the first bearing 51, wherein the second bearing 52 is provided on the differential case 21, the inner race thereof is fitted over the rotor shaft 13, and the outer race thereof is fitted in a bearing hole formed in the differential case 21, thus supporting the differential case 21 and the rotor shaft 13 in the middle, eliminating a center stay case for supporting one bearing of the differential case 21 or one bearing of the rotor shaft 13 provided in a conventional coaxial electric drive bridge, thereby simplifying the case structure and facilitating assembly.

As shown in fig. 2, the first gear 41 and the second gear 42 have opposite rotational directions. The first gear 41 and the second gear 42 are arranged on the rotor shaft 13 basically close to each other, and when the rotation directions of the first gear and the second gear are opposite, the axial force, the radial force and the tangential force generated in the 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, the working load is extremely small although the working rotation speed of the second bearing 52 is high. Similarly, the seventh gear 47 is rotated in the opposite direction to the fourth gear 44, and the eighth gear 48 is rotated in the opposite direction 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 force, the radial force and the tangential force on the seventh gear 47 and the eighth gear 48 can be substantially cancelled under the condition that the rotation direction of the first gear 41 is opposite to that of the second gear 42, so that the working load of the third bearing 53 is directly reduced, and the working load of the second bearing 52 and the first bearing 51 is indirectly reduced.

Typically, the two gears on the layshaft are arranged to have the same rotational direction so that the axial forces on the two gears cancel out a portion, and therefore, the rotational direction of third gear 43 is opposite to the rotational direction of first gear 41, and the rotational direction of fourth gear 44 is the same as that of third gear 43. 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.

Further, the power of the drive motor 1 is transmitted to the first counter shaft 31 and the second counter shaft 32 through the first gear 41 and the second gear 42, respectively, and it may be designed that only half of the power is transmitted per counter shaft. While it is generally desirable that the center distance between the counter shaft and the rotor shaft be small to reduce the volume and weight of the reducer portion, the center distance is mainly limited by the fatigue strength of the pinion gear of the final reducer, and thus the center distance is difficult to reduce. After the two countershafts are used for splitting, obviously, the center distance can be properly reduced under the condition that the strength of the fourth gear 44 and the sixth gear 46 is not reduced, so that the contour of the shell protruding forwards and backwards is reduced, and the space near the vehicle body floor near the installation of the electric drive axle is more favorably and fully utilized, and the adaptability is improved.

An electric drive device according to a specific embodiment of the present invention includes: the driving motor comprises an annular rotor, a stator and a rotor shaft, wherein the annular rotor is coaxially arranged in an inner cavity of the stator, and the annular rotor is sleeved on the rotor shaft; a differential including a differential case; the intermediate transmission shaft penetrates through an inner cavity of the rotor shaft and one end of the intermediate transmission shaft is connected with the differential; a first bearing and a second bearing for supporting the rotor shaft; a third bearing for supporting the differential case; a first countershaft; a fourth bearing and a fifth bearing for supporting the first countershaft; a second countershaft; a sixth bearing and a seventh bearing for supporting the second countershaft. There is no need to provide an intermediate support housing between the differential and the rotor shaft, thereby simplifying the housing structure and facilitating assembly.

For a specific implementation scheme of this embodiment, reference may be made to relevant descriptions in the foregoing embodiments, which are 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 the terms "first," "second," and the like in the description of the present invention are used for descriptive purposes only and are not to be construed as indicating or implying relative importance. Further, 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 utility model. 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 utility model 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 utility model. The specification and drawings are, accordingly, to be regarded in an illustrative rather than a restrictive sense.

Claims

1. An electric drive device is characterized by comprising a drive motor (1), a differential (2), an intermediate transmission shaft, a first auxiliary shaft (31), a second auxiliary shaft (32), a first bearing (51), a second bearing (52), a third bearing (53), a fourth bearing (54), a fifth bearing (55), a sixth bearing (56) and a seventh bearing (57), wherein the drive motor (1) comprises an annular rotor (11), a stator (12) and a rotor shaft (13), the annular rotor (11) is coaxially arranged in an inner cavity of the stator (12), the annular rotor (11) is sleeved on the rotor shaft (13), the intermediate transmission shaft penetrates through the inner cavity of the rotor shaft (13) and is connected with the differential (2) at one end of the intermediate transmission shaft, and the first bearing (51) and the second bearing (52) support the rotor shaft (13), the third bearing (53) supports the housing of the differential (2), the fourth bearing (54) and the fifth bearing (55) support the first secondary shaft (31), the sixth bearing (56) and the seventh bearing (57) support the second secondary shaft (32), and the first secondary shaft (31) and the second secondary shaft (32) are symmetrically arranged.

2. An electric drive device according to claim 1, characterized in that the differential (2) comprises a differential case (21), the differential case (21) and the rotor shaft (13) are supported by a third bearing (53), a second bearing (52) and a first bearing (51), the second bearing (52) is arranged on the differential case (21), an inner ring of the second bearing (52) is sleeved on the rotor shaft (13), and an outer ring of the second bearing (52) is arranged in a bearing hole formed in the differential case (21).

3. An electric drive device according to claim 1, characterized in that said device further comprises a first gear (41) and a second gear (42), said first gear (41) and said second gear (42) being mounted around the rotor shaft (13) and being arranged side by side, said first gear (41) and said second gear (42) being located between the second bearing (52) and the annular rotor (11), said first gear (41) and said second gear (42) having opposite rotational directions, said first gear (41) and said second gear (42) being mounted close to the rotor shaft (13).

4. An electric drive device according to claim 3, characterized in that said device further comprises a third gear (43) and a fourth gear (44), said third gear (43) being mounted on said first countershaft (31) and adjacent to said fourth bearing (54), said third gear (43) being in meshing engagement with said first gear (41), said fourth gear (44) being mounted on said first countershaft (31) and adjacent to said fifth bearing (55), said third gear (43) and said fourth gear (44) having the same rotational direction.

5. An electric drive device according to claim 4, characterized in that said device further comprises a fifth gear (45) and a sixth gear (46), said fifth gear (45) being mounted on the second countershaft (32) and being adjacent to the sixth bearing (56), said fifth gear (45) being in meshing engagement with said second gear (42), said sixth gear (46) being mounted on the second countershaft (32) and being adjacent to the seventh bearing (57), said fifth gear (45) and said sixth gear (46) having the same direction of rotation.

6. An electric drive device according to claim 5, characterized in that it further comprises a seventh gear (47) and an eighth gear (48), said seventh gear (47) and said eighth gear (48) being arranged side by side, said seventh gear (47) being mounted on the housing of the differential (2) and being adjacent to the second bearing (52), said seventh gear (47) being in meshing transmission with said fourth gear (44), said eighth gear (48) being mounted on the housing of the differential (2) and being adjacent to the third bearing (53), said eighth gear (48) being in meshing transmission with said sixth gear (46), said seventh gear (47) and said eighth gear (48) having opposite directions of rotation.

7. An electric drive device according to claim 6, characterized in that said first gear wheel (41) and said second gear wheel (42) are splined on the rotor shaft (13) or are made in one piece with the rotor shaft (13); the fourth gear (44) is sleeved on the first auxiliary shaft (31) through a spline or is integrally manufactured with the first auxiliary shaft (31); the sixth gear (46) is sleeved on the second auxiliary shaft (32) through a spline or is integrally manufactured with the second auxiliary shaft (32); the seventh gear (47) and the eighth gear (48) are sleeved and fixedly connected to the differential case (21) through bolts.