CN112498077A

CN112498077A - Electric drive assembly system and vehicle

Info

Publication number: CN112498077A
Application number: CN202011479185.0A
Authority: CN
Inventors: 王文辉; 韩龙; 赵振宇; 陈汝鹏
Original assignee: Siemens Electric Vehicle Powertrain System Shanghai Co ltd
Current assignee: Siemens Electric Vehicle Powertrain System Shanghai Co ltd
Priority date: 2020-09-30
Filing date: 2020-12-15
Publication date: 2021-03-16
Also published as: EP4222844A1; WO2022068821A1

Abstract

The present invention relates to an electric drive assembly system comprising: the shell comprises a main body and a first end cover matched with the main body; a rotor shaft having an axis of rotation and having a first end proximate the first end cover along the axis of rotation and a second end opposite the first end; and a gear input shaft disposed coaxially with the rotor shaft and having a first end portion and a second end portion, the gear input shaft being accommodated in a gear accommodating space formed by the first end cover and another portion of the main body; wherein the housing is a housing shared by the motor and the gear input shaft, wherein the electric drive assembly system further comprises: a first bearing, a second bearing and a third bearing.

Description

Electric drive assembly system and vehicle

Technical Field

The invention relates to an electric drive assembly system and a vehicle comprising the same.

Background

In the current market, the motor, inverter and reducer of the electric drive system are usually manufactured separately. The motor, the reducer, and the inverter are connected to each other by fasteners. Since the housings of the motor and the decelerator are separated, signal connection and cooling water flow between the inverter and the motor require separate connectors and water pipes.

Meanwhile, the electric drive system is large in size and size. The existing integration methods of electric drive systems take up a lot of space in the overall layout of the vehicle, thus presenting the following difficulties: the total cost is relatively high and the market competitiveness is lacking.

Disclosure of Invention

The present invention addresses the above-mentioned problems and needs, and provides an electric drive assembly system and a vehicle including the same, which are capable of solving the above-mentioned problems and having other technical advantages due to the following technical solutions.

According to one aspect of the present disclosure, an electric drive assembly system is provided, including a housing including a main body and a first end cap mated with the main body; a rotor shaft having a rotational axis and having a first end portion adjacent the first end cover along the rotational axis and a second end portion opposite the first end portion, the rotor shaft being at least partially received within a motor receiving space formed by a portion of the body, the rotor shaft being rotationally fixed to a rotor of the motor; and a gear input shaft disposed coaxially with the rotor shaft and having a first end portion adjacent to the first end cover along the rotation axis and a second end portion opposite to the first end portion, the gear input shaft being received in a gear receiving space formed by the first end cover and another portion of the main body, the gear input shaft being rotationally fixed to the rotor shaft. The housing is a housing shared by the motor and the gear input shaft, and the first end of the rotor shaft extends towards the gear accommodating space and is located in a shaft hole of the gear input shaft. The electric drive assembly system further comprises: a first bearing supporting the gear input shaft at a first end portion; a second bearing supporting the rotor shaft at a second end; and a third bearing supporting the gear input shaft at a second end portion and mounted within the body.

With the above features, only three bearings are required for supporting the rotor shaft and the gear input shaft. A housing part and, accordingly, a die-cast grinding tool can be reduced by the common housing of the electric motor and the gear input shaft. In addition, the weight and overall size of the electric drive assembly system can be reduced, which is more favorable for the spatial arrangement thereof in the vehicle, and makes it more competitive in the market. For example, the length of the electric drive assembly system along the axis of rotation may be reduced by 15-20 mm.

In some examples, the first bearing is mounted within a first end cap.

In some examples, the housing further comprises a second end cap cooperating with the body, the second end cap being disposed opposite the first end cap, the second bearing being mounted within the second end cap.

Through above-mentioned characteristic, two bearings can install respectively in the bearing mounting hole of an organic whole in first end cover and second end cover, compare in set up alone and set up the bearing frame of seting up the dead eye and again be connected to this bearing frame to the casing, the simplification of the structure of being more convenient for, and more do benefit to the machining precision who guarantees the dead eye.

In some examples, the rotor shaft is splined with the gear input shaft.

Through the characteristics, the rotor shaft and the gear input shaft can be reliably and rotationally fixed in the circumferential direction through the spline.

In some examples, the rotor shaft is clearance fit with the shaft bore at the second end portion.

Through above-mentioned characteristic, the fit clearance between the shaft hole of longer rotor shaft and gear input shaft is provided, helps improving the cooperation reliability of rotor shaft and gear input shaft.

In some examples, a circumferentially extending seal is disposed between the rotor shaft and the gear input shaft at the second end portion.

In some examples, the electric drive assembly system further includes a mount having a cylindrical body mounted to the first end portion by bolts and a flange axially abutting the first end portion.

In some examples, a circumferentially extending seal is provided between the mount and the gear input shaft at the first end portion.

By the sealing elements at the first end portion and the second end portion, an effective sealing between the lubricant inside the shaft bore and the outside can be ensured.

In some examples, the seal is an O-ring.

In some examples, a circumferentially extending lip seal is disposed between the rotor shaft and the main body and adjacent the third bearing.

In some examples, at least one of the first bearing, the second bearing, and the third bearing is a deep groove ball bearing.

Through the characteristics, the deep groove ball bearing is adopted, so that the supporting reliability is ensured, and meanwhile, the cost is reduced.

In some examples, the electric drive assembly system further comprises a two-stage helical gear parallel shaft speed reducer arrangement.

In some examples, the electric drive assembly system is provided with a differential disposed within the gear receiving space and coupled to the speed reducer arrangement.

In some examples, the retarder arrangement and differential are provided with deep groove ball bearings.

In some examples, the electric drive assembly system further includes an inverter housing secured to the housing.

According to another aspect of the present invention, a vehicle is provided, comprising an electric drive assembly system as described above.

In summary, the electric drive assembly system of the present invention only requires three bearings for supporting the rotor shaft and the gear input shaft. A housing part and, accordingly, a die-cast grinding tool can be reduced by the common housing of the electric motor and the gear input shaft. In addition, the weight and overall size of the electric drive assembly system can be reduced, which is more favorable for the spatial arrangement thereof in the vehicle, and makes it more competitive in the market. The vehicle of the present invention also has the same advantages and benefits as the electric drive assembly system described above.

Drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings of the embodiments of the present invention will be briefly described below. Wherein the drawings are only for purposes of illustrating some embodiments of the invention and are not to be construed as limiting the invention to all embodiments thereof.

FIG. 1 is a front view of an electric drive assembly system according to an exemplary embodiment of the present invention;

FIG. 2 is a cross-sectional view of an electric drive assembly system according to an exemplary embodiment of the present invention;

FIG. 3 shows an enlarged partial view of the rotor shaft and shaft bore clearance fit of FIG. 2.

List of reference numerals

1 casing

11 main body

12 first end cap

13 second end cap

2 rotor shaft

21 first end part

22 second end portion

3 Gear input shaft

31 first end portion

32 second end portion

4 first bearing

5 second bearing

6 third bearing

71,72 seal

8 mounting part

9 lip seal

101 input gear

102 intermediate first gear

103 intermediate second gear

104 intermediate shaft

20 differential mechanism

100 motor

110 rotor

120 stator

200 speed reducer

300 inverter

301 inverter case

M motor accommodating space

G gear accommodating space

Axis of rotation A

Detailed Description

In order to make the objects, technical solutions and advantages of the embodiments of the present disclosure more clear, the embodiments of the present disclosure will be described in detail and completely with reference to the accompanying drawings of specific embodiments of the present disclosure. Like reference symbols in the various drawings indicate like elements. It should be noted that the described embodiments are only some of the embodiments of the present disclosure, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the described embodiments of the disclosure without any inventive step, are within the scope of protection of the disclosure.

Unless defined otherwise, technical or scientific terms used herein shall have the ordinary meaning as understood by one of ordinary skill in the art to which this disclosure belongs. The use of "first," "second," and similar terms in the description and claims of the present disclosure are not intended to indicate any order, quantity, or importance, but rather are used to distinguish one element from another. Also, the use of the terms "a" or "an" and the like do not necessarily denote a limitation of quantity. The word "comprising" or "comprises", and the like, means that the element or item listed before the word covers the element or item listed after the word and its equivalents, but does not exclude other elements or items. The terms "connected" or "coupled" and the like are not restricted to physical or mechanical connections, but may include electrical connections, whether direct or indirect. "upper", "lower", "left", "right", and the like are used merely to indicate relative positional relationships, and when the absolute position of the object being described is changed, the relative positional relationships may also be changed accordingly.

The electric driving has become one of the important development directions in the automobile industry, and the integration level, the light weight and the reliability of the electric driving assembly system as the power system of the electric automobile are focused.

The electric drive assembly system is a highly integrated electric drive system, and generally comprises a permanent magnet synchronous motor, an inverter and a speed reducer. In the current market, the motor, the inverter and the reducer of the electric drive system are generally manufactured separately, and the motor, the reducer and the inverter are connected with each other by fasteners, and the separated arrangement makes the electric drive assembly system large in size and weight and occupies a large space in the overall layout of the vehicle.

In view of the above, the present invention proposes an electric drive assembly system and a vehicle, in particular an electric vehicle, comprising such an electric drive assembly system.

FIG. 1 is a front view of an electric drive assembly system according to an exemplary embodiment of the present invention. FIG. 2 is a cross-sectional view of an electric drive assembly system according to an exemplary embodiment of the present invention.

As shown in fig. 1, the electric drive assembly system may include a motor 100, a reducer 200, and an inverter 300. The inverter 300 converts direct current (e.g., a battery, a storage battery) into constant-frequency, constant-voltage or frequency-modulated and voltage-regulated alternating current to be input to the electric motor 100, and the electric motor 100 is, for example, a permanent magnet synchronous motor or an alternating current asynchronous motor. The motor 100 is in transmission connection with the reducer 200, so that the torque of the motor 100 is output after being reduced by the reducer 200.

The motor 100 may include a rotor 110 and a stator 120, and the arrangement of the rotor 110 and the stator 120 is a common means in the art and is not specifically described in the present disclosure.

FIG. 2 illustrates a cross-sectional view of an electric drive assembly system of an exemplary embodiment of the present invention, with FIG. 2 further detailing the structural diagram of the electric drive assembly system. As shown in fig. 2, the electric drive assembly system further comprises: the gear-driven motor comprises a shell 1, a rotor shaft 2, a gear input shaft 3, a first bearing 4, a second bearing 5 and a third bearing 6.

The housing 1 comprises a main body 11 and a first end cap 12 cooperating with the main body 11. Furthermore, the housing 1 may further include a second end cap 13 engaged with the main body 11, the second end cap 13 being disposed opposite the first end cap 12. Specifically, the first and second end caps 12 and 13 are oppositely disposed at both ends of the main body 11, and may be mounted to the main body 11 by fasteners, such as bolts. Alternatively, the first and second end caps 12 and 13 may also be welded to the body 11 after assembly.

A portion of the main body 11 forms a motor receiving space M, and another portion of the main body 11 forms a gear receiving space G with the first cover 12. Specifically, a motor accommodating space M is defined by a portion of the main body 11, and the second end cap 13 closes the motor accommodating space M. Another part of the main body 11 and the first end cap 12 enclose to form a gear accommodating space G, i.e., a part of the gear accommodating space G is provided by the main body 11, and another part is provided by the first end cap 12.

Compared with the mode that the motor and the speed reducer are arranged separately, the shell 1 and the first end cover 12 provided by the invention can omit a shell part, thereby reducing die casting molds for machining the shell part, and in addition, the arrangement of the common shell of the motor and the speed reducer can obtain more compact and light electric drive assembly arrangement, and the length of the length direction (the direction of the rotating axis A of the rotor shaft 2) can be actually reduced by 15-20 mm.

The rotor shaft 2 is rotationally fixed to a rotor 110 of the motor 100. The rotor shaft 2 has an axis of rotation a and has a first end 21 adjacent the first end cap 12 along the axis of rotation a and a second end 22 opposite the first end 21. The rotor shaft 2 is at least partially accommodated in the motor accommodating space M, and the other part is accommodated in the gear accommodating space G.

It should be noted that "rotationally fixed" as used herein means that two components are connected for common rotation, and their mutual movement in the direction of rotation (e.g. circumferential direction) is limited so as to be able to rotate together. "rotationally fixed" does not restrict displacement in the direction of the axis of rotation a, and therefore the two rotationally fixed parts can be displaced relative to each other in the direction of the axis of rotation a. If the displacement in the direction of the axis of rotation a is also fixed, the two parts can be considered to be completely fixedly connected.

Further, the first end portion 21 of the rotor shaft 2 is supported by the first end cover 12, the second end portion 22 of the rotor shaft 2 is supported by the second end cover 13, and the intermediate portion of the rotor shaft 2 between the first end portion 21 and the second end portion 22 is supported by the main body 11. The middle portion is located at an edge of the gear accommodating space G adjacent to the motor accommodating space M. Specifically, the support of the rotor shaft 2 is achieved by a first bearing 4, a second bearing 5, and a third bearing 6, respectively, which will be described in detail below.

The gear input shaft 3 is disposed coaxially with the rotor shaft 2 and has a first end portion 31 adjacent to the first end cover 12 along the rotation axis a and a second end portion 32 opposite to the first end portion 31, the gear input shaft 3 is accommodated in a gear accommodating space G formed by the first end cover 12 and another portion of the main body 11, and the gear input shaft 3 is rotationally fixed to the rotor shaft 2.

Specifically, the first end portion 21 of the rotor shaft 2 extends toward the gear accommodating space G and is located in the shaft hole of the gear input shaft 3. Alternatively, the rotor shaft 2 is splined to the gear input shaft 3. For example, the rotor shaft 2 has external splines, and the gear input shaft 3 has internal splines that mate with the external splines. The present invention is not limited thereto, and those skilled in the art may adopt other common shaft coupling means, such as bonding, riveting, bolting, etc.

In the present embodiment, the housing 1 is a housing shared by the motor 100 and the gear input shaft 3. Further, the housing 1 is a housing shared by the motor 100 and the decelerator 200.

In the present embodiment, the first bearing 4 supports the gear input shaft 3 at the first end portion 31, thereby indirectly supporting the rotor shaft 2. The second bearing 5 supports the rotor shaft 2 at a second end 22. The third bearing 6 supports the gear input shaft 3 at the second end portion 32 and is mounted within the main body 11.

Specifically, the first bearing 4 is mounted within the first end cap 12 and the second bearing 5 is mounted within the second end cap 13. First end cover 12 and second end cover 13 can form the bearing mounting hole that is used for the installation bearing integratively, compares and sets up the bearing frame of seting up the dead eye alone and again with this bearing frame be connected to the casing, the simplification of the structure of being more convenient for, and more do benefit to the machining precision who guarantees the dead eye.

The rotor shaft 2 is clearance fitted with the shaft bore at the second end portion 32. Fig. 3 shows a close-up view of the rotor shaft 2 and shaft bore clearance fit of fig. 2 and shows this clearance fit in particular.

As can be seen from fig. 3, at the second end portion 32 there is a gap between the rotor shaft 2 and the gear input shaft 3, and at the second end portion 32 a circumferentially extending seal 72 is provided between the rotor shaft 2 and the gear input shaft 3 to seal the gap.

Optionally, the electric drive assembly system may further comprise a mounting member 8, the mounting member 8 having a cylindrical body mounted to the first end portion by bolts and a flange axially abutting the first end portion 31.

Similarly, a circumferentially extending seal 71 is provided between the mount 8 and the gear input shaft 3 at the first end portion 31.

Alternatively, both

seals

71,72 may be O-rings.

Exemplarily, a circumferentially extending lip seal 9 is arranged between the rotor shaft 2 and the main body and adjacent to the third bearing 6, which lip seal 9 is a bidirectional seal.

Illustratively, at least one of the first bearing 4, the second bearing 5, and the third bearing 6 is a deep groove ball bearing. In the present embodiment, the first bearing 4, the second bearing 5, and the third bearing 6 are all deep groove ball bearings.

Exemplarily, the electric drive assembly system may further comprise a two-stage helical gear parallel shaft speed reducer arrangement, the electric drive assembly system being provided with a differential 20, the differential 20 being provided within the gear receiving space G and being coupled to the speed reducer arrangement 10. FIG. 2 illustrates, by way of example and not limitation, a two-stage helical gear parallel shaft reducer arrangement.

The retarder arrangement may include an input gear 101, an intermediate first gear 102 and an intermediate second gear 103. The input gear 101 is fixedly coupled to the gear input shaft 3, and may be formed integrally with the gear input shaft 3 or connected by splines, for example. An intermediate first gear 102 and an intermediate second gear 103 are arranged in turn on an intermediate shaft 104. The intermediate shaft 104 is arranged in parallel with the gear input shaft 3, and the intermediate shaft 104 may be a hollow shaft. The dimensions of the input gear 101, the intermediate first gear 102 and the intermediate second gear 103 may be chosen according to the actual requirements. An intermediate first gear 102 is in driving engagement with the input gear 101 and an intermediate second gear 103 may be bolted to the differential 20. A two-stage helical gear parallel shaft reduction arrangement from the gear input shaft 3 to the differential 20 is thus realized by way of example.

Optionally, the reducer arrangement 10 and the differential 20 are provided with deep groove ball bearings. For example, both ends of the intermediate shaft 104 and both ends of the differential 20 may be supported by deep groove ball bearings, respectively. Half of the deep groove ball bearings are mounted in the first end cap 12 and the other half of the deep groove ball bearings are mounted in the main body 11.

Optionally, the electric drive assembly system may further comprise a cooling heat exchange system. The cooling and heat exchanging system is, for example, a circulating water cooling system, which is disposed in the motor accommodating space M and cools the stator of the motor 100 in a water cooling manner. The cooling heat exchange system may further comprise heat sinks for enhanced heat dissipation, which may be formed integrally with the second end cap 13 or fixedly connected to the second end cap 13.

Furthermore, the electric drive assembly system may further include an inverter housing 301, the inverter housing 301 being fixed to the housing 1. To sum up, the connection and arrangement between the motor 100, the decelerator 200, and the inverter 300 are thereby formed.

According to another aspect of the present invention, a vehicle is provided comprising an electric drive assembly system as described above. In particular, the vehicle may be an electric car.

In summary, the electric drive assembly system of the present invention only requires three bearings for supporting the rotor shaft and the gear input shaft. The common housing for the motor and the gear input shaft can be reduced by one housing part and correspondingly by a reduced set of die-cast grinding tools. In addition, the weight and overall size of the electric drive assembly system can be reduced, which is more favorable for the spatial arrangement thereof in the vehicle, and makes it more competitive in the market. The vehicle of the present invention also has the same advantages and benefits as the electric drive assembly system described above.

The above description is only for the specific embodiments of the present disclosure, but the scope of the embodiments of the present disclosure is not limited thereto, and any person skilled in the art can easily conceive of the changes, substitutions or combinations within the technical scope of the embodiments of the present disclosure or under the concept of the embodiments of the present disclosure, and all of them should be covered by the scope of the embodiments of the present disclosure.

Claims

1. An electric drive assembly system comprising:

the shell comprises a main body and a first end cover matched with the main body;

a rotor shaft having a rotational axis and having a first end portion adjacent the first end cover along the rotational axis and a second end portion opposite the first end portion, the rotor shaft being at least partially received within a motor receiving space formed by a portion of the body, the rotor shaft being rotationally fixed to a rotor of the motor; and

a gear input shaft disposed coaxially with the rotor shaft and having a first end portion adjacent to the first end cover along the rotation axis and a second end portion opposite to the first end portion, the gear input shaft being accommodated in a gear accommodating space formed by the first end cover and another portion of the main body, the gear input shaft being rotationally fixed to the rotor shaft;

wherein the housing is a housing shared by the motor and the gear input shaft,

wherein the first end part of the rotor shaft extends towards the gear accommodating space and is positioned in the shaft hole of the gear input shaft,

wherein the electric drive assembly system further comprises:

a first bearing supporting the gear input shaft at a first end portion;

a second bearing supporting the rotor shaft at a second end; and

a third bearing supporting the gear input shaft at a second end portion and mounted within the body.

2. The electric drive assembly system of claim 1, wherein the first bearing is mounted within a first end cap.

3. The electric drive assembly system of claim 2, wherein the housing further comprises a second end cap mated with the body, the second end cap disposed opposite the first end cap, the second bearing mounted within the second end cap.

4. The electric drive assembly system of claim 1, wherein the rotor shaft is splined with the gear input shaft.

5. The electric drive assembly system of claim 1 or 4, wherein the rotor shaft is clearance fit with the shaft bore at the second end portion.

6. The electric drive assembly system of claim 5, wherein a circumferentially extending seal is disposed between the rotor shaft and the gear input shaft at the second end portion.

7. The electric drive assembly system of claim 1, further comprising: a mounting member having a cylindrical body mounted to the first end portion by bolts and a flange axially abutting the first end portion.

8. The electric drive assembly system of claim 7, wherein a circumferentially extending seal is disposed between the mount and the gear input shaft at the first end portion.

9. The electric drive assembly system of claim 6 or 8, wherein the seal is an O-ring.

10. The electric drive assembly system of claim 1, wherein a circumferentially extending lip seal is disposed between the rotor shaft and the main body and adjacent the third bearing.

11. The electric drive assembly system of claim 1, wherein at least one of the first, second, and third bearings is a deep groove ball bearing.

12. The electric drive assembly system of claim 1, further comprising: the two-stage spiral gear parallel shaft speed reducer is arranged.

13. The electric drive assembly system of claim 12, wherein the electric drive assembly system is provided with a differential disposed within the gear receiving space and coupled to the speed reducer arrangement.

14. The electric drive assembly system of claim 13, wherein the speed reducer arrangement and differential are provided with deep groove ball bearings.

15. The electric drive assembly system of claim 1, further comprising: an inverter case fixed to the case.

16. A vehicle comprising an electric drive assembly system according to any one of claims 1-15.