CN213125704U

CN213125704U - Electric drive device

Info

Publication number: CN213125704U
Application number: CN202022127666.7U
Authority: CN
Inventors: 夏承钢; 邓华红; 张于于
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 part of the rotor shaft, which is positioned in the first boss, is sleeved with a first bearing and a second bearing; the differential mechanism is accommodated in the second cavity, the intermediate transmission shaft penetrates through the rotor shaft and is connected with the differential mechanism, the first shell is further provided with a second boss which deviates from the first boss, a third bearing is arranged at the end part of the second boss and is accommodated in the shell of the differential mechanism, and a fourth bearing is further sleeved at one end, far away from the rotor shaft, of the shell of the differential mechanism; 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;

the middle transmission shaft penetrates through the first shell and the second shell;

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

the differential mechanism is accommodated in the second cavity, the first shell is further provided with a second boss deviating from the first boss, a third bearing is arranged at the end of the second boss and accommodated in the shell of the differential mechanism, and a fourth bearing is further sleeved at one end, far away from the rotor shaft, of the shell of the differential mechanism;

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 device of the above-mentioned type, further characterized in that the electric drive device further includes a first gear fitted over the rotor shaft and between the second bearing and the third bearing, the first gear being received in the second boss.

In the above-mentioned electric driving device, it is further characterized in that the electric driving device further includes a second gear, the second gear is sleeved on one end of the counter shaft close to the first housing, the second gear is in meshing transmission with the first gear, and the second boss is provided with a corresponding notch at a position where the first gear is in meshing transmission with the second gear.

In the above-mentioned electric driving device, it is further characterized in that the first housing is further provided with a third boss accommodated in the second cavity, the third boss is provided on the first housing and extends toward the second gear, and the fifth bearing is accommodated in the second boss.

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

In an electric drive device of the above-described type, there is a further feature that the first housing is further provided with a third boss accommodated in the second cavity, the third boss being provided on the first housing and extending toward the second housing, the fifth bearing and the sixth bearing being fitted over the third boss, and the counter shaft being disposed outside the fifth bearing and the sixth bearing.

In the above electric driving device, the third boss is provided with a positioning hole on one side facing the second housing, a positioning member hole is formed in a corresponding position of the second housing, and a positioning member penetrates through the positioning member hole and the positioning hole.

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, the stator is coaxially disposed outside the rotor, the first housing is provided with a fourth boss, the fourth boss is coaxially disposed outside the first boss, the fourth boss and the first boss are located on the same side of the first housing, and the rotor and the stator are accommodated between the fourth boss and the first boss.

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 two bearings are installed on the rotor shaft, have improved the rotational accuracy of whole rotor shaft, and at least three bearing is installed on first casing, is showing and improves the machining precision, eliminates assembly error, improves the rotational accuracy, and then improves the NVH performance of device.

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;

fig. 3 is a schematic structural diagram of an electric drive device according to a third embodiment of the present invention.

In the drawings: 1. a first housing; 11. a first boss; 12. a second boss; 121. opening the gap; 13. a third boss; 131. positioning holes; 14. a fourth boss; 15. a first cavity; 2. a second housing; 21. a second cavity; 22. a fifth boss; 23. a locating piece hole; 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; 91. a positioning member; 92. 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.

The first shell 1 has a first cavity 15 at one end and a second cavity 21 enclosed by the other end and the second shell 2.

Specifically, the side of the first housing 1 away from the first cavity 15 and the second housing 2 are fixed together by a fastener 92.

The drive motor 3 is accommodated in the first cavity 15.

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

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

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 fourth boss 14, the fourth boss 14 is coaxially arranged outside the first boss 11, the fourth boss 14 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 fourth boss 14 and the first boss 11.

Specifically, the stator 31 and the rotor 32 are installed in a cavity formed by the fourth boss 14 and the first boss 11, the diameter of the stator 31 is matched with the diameter of an inner cavity of the fourth boss 14, the outer diameter and the length of the fourth boss 14 are both larger than those of the first boss 11, namely, the first boss 11 is accommodated in the fourth boss 14.

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

The first housing 1 is further provided with a second boss 12 facing away from the first boss 11, a third bearing 63 being mounted on the end of the second boss 12, the third bearing 63 being accommodated in the housing 41 of the differential 4.

Specifically, in the present embodiment, the second boss 12 extends into the second cavity 21, the inner diameter of the third bearing 63 is fitted over the end of the second boss 12, and the outer diameter is accommodated in the housing 41 of the differential 4.

The 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 22 that protrudes into the second cavity 21 and toward the differential case 41, and the fourth bearing 64 is accommodated in the fifth boss 22. The bearing bore inner diameter of the fifth boss 22 is matched 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 auxiliary shaft 7 is accommodated in the second cavity 21, a fifth bearing 65 and a sixth bearing 66 are sleeved at two opposite ends of the auxiliary shaft 7, and the auxiliary shaft 7 is in driving connection with the rotor shaft 34 and the differential 4 respectively. Wherein the fifth bearing 65 and the sixth bearing 66 are used to support the countershaft 7.

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 by 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.

Specifically, in the present embodiment, the first gear 81 is accommodated in the second boss 12, the second boss 12 is a stepped boss, and the diameter of the first gear 81 is larger than the diameter of the portion where the third bearing 63 is sleeved.

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.

Specifically, the second boss 12 is provided with a corresponding notch 121 at a position where the first gear 81 is engaged with the second gear 82.

The gap 121 is provided in this embodiment in order to meet the requirement of meshing assembly of the rotor shaft 34, the counter shaft 7, the first gear 81 and the second gear 82. For example, rotor shaft 34 is assembled with first gear 81, and then first bearing 61 and second bearing 62 are assembled to rotor shaft 34 by interference fit. A similar process is used for the layshaft 7 to form the layshaft assembly. Based on such an assembly method, it is necessary to match the outer diameters of the bearing and the gear to smoothly assemble.

The layshaft 7 is first mounted in place after forming the layshaft assembly, i.e. the second gear 82 is mounted with the layshaft 7 from the right to the left into the second cavity 21. The provision of the gap 121 allows the second gear 82 to be mounted without obstruction to axial movement, and the first gear 81 is then inserted into the cavity of the first boss 11 and moved into the cavity of the second boss 12 with the rotor shaft 34 from left to right, entering the end face of the second gear 82 and mounting the teeth in position. The radius of the portion of the second boss 12 corresponding to the third bearing 63 should be smaller than the distance from the flat portion of the notch 121 to the axis of the rotor shaft 34, and the distance from the flat portion of the notch 121 to the axis of the rotor shaft 34 should be smaller than the radius of the root circle of the first gear 81. This arrangement enables the second gear 82 to be smoothly moved from right to left to the position of the first gear 81, ensuring that it is engaged with the first gear 81, and the third bearing 63 coaxially disposed on the second boss 12 can be supported by the outer wall over the entire circumference. The third bearing 63 is then fitted to the corresponding peripheral wall of the second boss 12.

Optionally, in the present embodiment, the first housing 1 is further provided with a third boss 13 accommodated in the second cavity 21, the third boss 13 is arranged on the first housing 1 and extends to the second gear 82, and the fifth bearing 65 is accommodated in the third boss 13. The inner diameter of the bearing hole of the third boss 13 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.

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 on the second boss 12 of the first housing 1, and shares one housing (the first housing 1) with the first bearing 61 and the second bearing 62, so that the rotational 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 opened in the third boss 13 of the first housing 1, and the bearing hole of the first bearing 61 and the second bearing 62 is opened in the same housing, so that the parallelism between the rotor shaft 34 and the auxiliary shaft 7 is better, and therefore the rotational accuracy of both 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 rotor shaft 34 and the auxiliary shaft 7 can be well guaranteed, the rotation precision of the two shafts is high, and the NVH performance is improved.

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 device in this embodiment differs from the electric drive device in the first embodiment described above in that the position of the third boss 13 and the position of the fifth bearing 65 differ from the first embodiment described above, and specifically, in this embodiment, the second housing 2 is further provided with the third boss 13 accommodated in the second cavity 21, the third boss 13 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 third boss 13. The inner diameter of the third boss 13 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, three bearings (i.e., the first bearing 61, the second bearing 62, and the third bearing 63) on the rotor shaft 34 are all mounted on the first housing 1, and two bearings (the fifth bearing 65 and the sixth bearing 66) of the counter shaft 7 are all mounted on the second housing 2, so that the rotational accuracy of the rotor shaft 34 and the counter shaft 7 is improved, thereby improving the NVH performance of the electric drive device.

Referring to fig. 3, fig. 3 is a schematic structural diagram of an electric driving device according to a third embodiment of the present invention.

The electric drive in this embodiment differs from the electric drive in the first and second embodiments described above in that in this embodiment a third boss 13 is provided on the first housing 1 and projects toward the second housing 2, a fifth bearing 65 and a sixth bearing 66 are fitted over the third boss 13, and the countershaft 7 is disposed outside the fifth bearing 65 and the sixth bearing 66.

Specifically, in the present embodiment, the third boss 13 is a stepped boss, and a diameter of an end close to the first housing 1 is larger than a diameter of an end close to the second housing 2.

The shape of the auxiliary shaft 7 is matched with the shape of the third boss 13, and is also a stepped shaft, and the auxiliary shaft 7 is assembled with the third boss 13 through the fifth bearing 65 and the sixth bearing 66, and the second gear 82 and the third gear 83 are respectively sleeved at two ends of the auxiliary shaft 7.

Alternatively, the second gear 82 and the third gear 83 are designed as one piece with the countershaft 7, i.e. the countershaft 7 is a gear shaft, but may be formed separately and connected by splines. 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, one side of the third boss 13 facing the second housing 2 is provided with a positioning hole 131, a positioning element hole 23 is formed in a corresponding position of the second housing 2, and a positioning element 91 is inserted into the positioning element hole 23 and the positioning hole 131.

Alternatively, the positioning member 91 may be a positioning pin, which is inserted into the positioning member hole 23.

In the present embodiment, the support manner of the auxiliary shaft 7 by the third boss 13 is changed from cantilever to both-end support so as to improve the support rigidity of the third boss 13, and the assembly accuracy of the first housing 1 and the second housing 2 can also be improved.

Alternatively, the positioning members 91 are provided on the end surface of the second housing 2, and the number may be two. When one of the positioning pieces 91 is directly positioned-fitted with the third boss 13 for supporting the auxiliary shaft 7, the fitting accuracy of the both housings can be further improved. The positioning piece hole 23 of the positioning piece 91 and the bearing hole of the fourth bearing 64 are both arranged on the second housing 2, and the position precision can be well ensured, so that the installation precision and the parallelism of the auxiliary shaft 7 and the differential 4 can be ensured.

Since the rotor shaft 34 is a high-speed shaft, and the meshing accuracy of the first gear 81 and the second gear 82 is more important, the third boss 13 supporting the two bearings of the counter shaft 7 is disposed on the first housing 1, that is, on the same member as the two bearing holes of the rotor shaft 34, and high positional accuracy can be ensured by performing one-time clamping processing during processing, so that the meshing accuracy of the first gear 81 and the second gear 82 is ensured, manufacturing errors and noise and vibration generated thereby are eliminated, and the NVH performance is improved. And the rotor shaft 34, the auxiliary shaft 7 and the differential case 41 are all integrated gear shafts, so that the NVH performance of the device can be obviously improved.

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;

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

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, said first gear received within said second boss.

3. The electric drive device of claim 2, further comprising a second gear sleeved on an end of the countershaft near the first housing, the second gear being in meshing transmission with the first gear, wherein the second boss is provided with a corresponding notch at a position where the first gear is in meshing transmission with the second gear.

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

5. The electric drive of claim 3 wherein said second housing is further provided with a third boss received in said second cavity, said third boss being located on a side of said second gear facing away from said first housing, said fifth bearing being received in said third boss.

6. The electric drive of claim 3 wherein said first housing is further provided with a third boss received in said second cavity, said third boss being disposed on said first housing and extending toward said second housing, said fifth and sixth bearings being nested on said third boss, said countershaft being disposed outboard of said fifth and sixth bearings.

7. The electric driving device as claimed in claim 6, wherein a positioning hole is disposed on a side of the third boss facing the second housing, a positioning member hole is disposed at a corresponding position of the second housing, and a positioning member is inserted into the positioning hole and the positioning hole.

8. An electric drive device according to any one of claims 4-7, 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.

9. The electric drive of claim 8 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.

10. The electric drive device according to claim 9, wherein the drive motor further includes a stator and a rotor, the rotor is disposed on the outer side of the rotor bracket, the stator is coaxially disposed on the outer side of the rotor, the first housing is provided with a fourth boss coaxially disposed on the outer side of the first boss, the fourth boss and the first boss are located on the same side of the first housing, and the rotor and the stator are accommodated between the fourth boss and the first boss.