Speed reducer, dual-motor driving system and vehicle

Abstract

The invention discloses a speed reducer, a dual-motor driving system and a vehicle, and relates to the technical field of automobiles, the speed reducer comprises a shell and a transmission structure, and the transmission structure comprises a first planet row and a second planet row which are arranged in the shell; the first planet row and the second planet row are used for being in transmission connection with two driving motors and two wheels correspondingly, and the first planet row and the second planet row are partially overlapped in the axial direction. According to the technical scheme, the first planet row and the second planet row are partially overlapped in the axial direction, so that the size occupied by the first planet row and the second planet row in the axial direction can be reduced, the axial size of the dual-motor driving system can be further reduced, and more batteries can be conveniently arranged to improve the endurance.

Description

Technical Field

[0001] The present invention relates to the field of automobile technology, and in particular to a reducer, a dual-motor drive system and a vehicle. Background Art

[0002] With the general development trend, battery life is the biggest pain point and anxiety of current new energy vehicles. Under the background of existing battery technology, compact electric drive can occupy a smaller layout space to increase the load type, and can make the vehicle have more battery layout space and relatively light vehicle weight, increasing the vehicle's battery life.

[0003] In the related art, the electric drive system occupies too much space in the axial direction, which makes the battery layout space smaller, resulting in poor vehicle endurance. Summary of the invention

[0004] The main purpose of the present invention is to propose a reducer, a dual-motor drive system and a vehicle, aiming to at least solve the problem in the related art that the electric drive system occupies too much dimension in the axial direction, resulting in a small space for battery arrangement and poor vehicle endurance.

[0005] To achieve the above object, the present invention proposes a reducer, which is applied to a dual-motor drive system, comprising:

[0006] a housing; and

[0007] The transmission structure includes a first planetary row and a second planetary row arranged in the housing, the first planetary row and the second planetary row are used to respectively drive and connect two drive motors and two wheels, and the first planetary row and the second planetary row are partially overlapped in the axial direction.

[0008] In one embodiment, the first planetary gear comprises a first sun gear rotatably mounted in the housing along an axis extending transversely, the first sun gear being configured to be drivingly connected to one of the drive motors;

[0009] The second planetary gear set includes a second inner ring gear disposed inside the first sun gear.

[0010] In one embodiment, the second internal gear ring is disposed coaxially with the first sun gear.

[0011] In one embodiment, the reducer further includes a bearing disposed between the second internal gear ring and the first sun gear.

[0012] In one embodiment, the first planetary gear further comprises:

[0013] A plurality of first planetary gears are respectively meshed with the outer sides of the first sun gear;

[0014] A first planet carrier, connected to the plurality of first planetary gears;

[0015] A first inner gear ring, the inner side of which is meshed with the outer sides of the first planetary gears and is fixedly connected to the housing;

[0016] Wherein, the first planet carrier is used for driving connection with the wheel to drive the corresponding wheel to rotate.

[0017] In one embodiment, the first planetary gear further comprises a first transmission gear disposed on the first planetary carrier;

[0018] The reducer further comprises a first output shaft whose axis is parallel to the first planet carrier, the first output shaft is provided with a first output gear meshing with the first transmission gear, and the first output shaft is used to connect with the corresponding wheel;

[0019] The first planet carrier is provided with a first avoidance hole, and the first avoidance hole is used for allowing the motor shaft corresponding to the drive motor to pass through the first planet carrier to be connected with the first sun gear.

[0020] In one embodiment, the second inner gear ring is fixedly connected to the housing;

[0021] The second planetary gear set further comprises:

[0022] A plurality of second planetary gears are respectively meshed with the inner sides of the second inner gear ring;

[0023] A second planet carrier, connecting a plurality of the second planetary gears; and

[0024] A second sun gear, the plurality of second planetary gears are respectively meshed with the outer side of the second sun gear, and the second sun gear is used for driving connection with another of the driving motors;

[0025] Wherein, the second planet carrier is used for driving connection with the wheel to drive the corresponding wheel to rotate.

[0026] In one embodiment, the second planetary gear further comprises a second transmission gear disposed on the second planetary carrier;

[0027] The reducer further comprises a second output shaft whose axis is parallel to the axis of the second planet carrier, the second output shaft is provided with a second output gear meshing with the second transmission gear, and the second output shaft is used to be connected to the corresponding wheel;

[0028] The second planet carrier is provided with a second avoidance hole, and the second avoidance hole is used for allowing the motor shaft corresponding to the drive motor to pass through the second planet carrier to be connected with the second sun gear.

[0029] The present invention further proposes a dual-motor drive system, comprising a reducer and two drive motors, wherein the reducer comprises:

[0030] a housing; and

[0031] The transmission structure comprises a first planetary row and a second planetary row arranged in the housing, wherein the first planetary row and the second planetary row are used to respectively drive and connect two drive motors and two wheels, and the first planetary row and the second planetary row are partially overlapped in the axial direction;

[0032] The two driving motors are respectively drivingly connected to the first planetary gear and the second planetary gear.

[0033] The present invention further provides a vehicle, comprising a dual-motor drive system, wherein the dual-motor drive system comprises a reducer and two drive motors, wherein the reducer comprises:

[0034] a housing; and

[0035] The transmission structure comprises a first planetary row and a second planetary row arranged in the housing, wherein the first planetary row and the second planetary row are used to respectively drive and connect two drive motors and two wheels, and the first planetary row and the second planetary row are partially overlapped in the axial direction;

[0036] The two driving motors are respectively drivingly connected to the first planetary gear and the second planetary gear.

[0037] In the technical solution of the present invention, the transmission structure includes a first planetary row and a second planetary row arranged in the shell, the first planetary row and the second planetary row are used to respectively transmit and connect two drive motors and two wheels, and the first planetary row and the second planetary row are partially overlapped in the axial direction; in this way, by arranging the first planetary row and the second planetary row partially overlapped in the axial direction, the size occupied by the first planetary row and the second planetary row in the axial direction can be reduced, thereby reducing the axial size of the dual-motor drive system, making it convenient to arrange more batteries to improve battery life. BRIEF DESCRIPTION OF THE DRAWINGS

[0038] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on the structures shown in these drawings without paying creative work.

[0039] Figure 1 A schematic structural diagram of an embodiment of a reducer provided by the present invention;

[0040] Figure 2 A schematic structural diagram of an embodiment of a dual-motor drive system provided by the present invention.

[0041] Description of Figure Numbers:

[0042] 1000. Dual-motor drive system; 100. Reducer; 1. Housing; 2. First planetary row; 21. First sun gear; 22. First planetary gear; 23. First planetary carrier; 231. First avoidance hole; 24. First inner ring gear; 25. First transmission gear; 3. Second planetary row; 31. Second inner ring gear; 32. Second planetary gear; 33. Second planetary carrier; 331. Second avoidance hole; 34. Second sun gear; 35. Second transmission gear; 4. Bearing; 5. First output shaft; 6. First output gear; 7. Second output shaft; 8. Second output gear; 200. Drive motor; 300. Wheel.

[0043] The realization of the purpose, functional features and advantages of the present invention will be further explained in conjunction with embodiments and with reference to the accompanying drawings. DETAILED DESCRIPTION

[0044] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0045] It should be noted that if the embodiments of the present invention involve directional indications (such as up, down, left, right, front, back, etc.), the directional indications are only used to explain the relative position relationship, movement status, etc. between the components in a certain specific posture. If the specific posture changes, the directional indication will also change accordingly.

[0046] In addition, if there are descriptions involving "first", "second", etc. in the embodiments of the present invention, the descriptions of "first", "second", etc. are only used for descriptive purposes and cannot be understood as indicating or implying their relative importance or implicitly indicating the number of technical features indicated. Therefore, the features limited to "first" and "second" may explicitly or implicitly include at least one of the features. In addition, if "and / or" or "and / or" appears in the full text, its meaning includes three parallel solutions. Taking "A and / or B" as an example, it includes solution A, solution B, or solutions that satisfy both A and B. In addition, the technical solutions between the various embodiments can be combined with each other, but it must be based on the ability of ordinary technicians in the field to implement. When the combination of technical solutions is contradictory or cannot be implemented, it should be deemed that such combination of technical solutions does not exist and is not within the scope of protection required by the present invention.

[0047] With the general development trend, battery life is the biggest pain point and anxiety of current new energy vehicles. Under the background of existing battery technology, compact electric drive can occupy a smaller layout space to increase the load type, and can make the vehicle have more battery layout space and relatively light vehicle weight, increasing the vehicle's battery life.

[0048] In the related art, the two planetary gears of the electric drive system are usually arranged in parallel in the axial direction, which occupies too much space in the axial direction, resulting in a small space for battery arrangement, resulting in poor endurance of the vehicle.

[0049] The main purpose of the present invention is to propose a reducer, a dual-motor drive system and a vehicle, aiming to at least solve the problem in the related art that the electric drive system occupies too much dimension in the axial direction, resulting in a small space for battery arrangement and poor vehicle endurance.

[0050] See also Figure 1 and Figure 2 In one embodiment of the present invention, the reducer 100 is applied to a dual-motor drive system 1000, including a housing 1 and a transmission structure, wherein the transmission structure includes a first planetary row 2 and a second planetary row 3 arranged in the housing 1, wherein the first planetary row 2 and the second planetary row 3 are used to respectively drive and connect two drive motors 200 and two wheels 300, and the first planetary row 2 and the second planetary row 3 are partially overlapped in the axial direction.

[0051] In the technical solution of the present invention, the transmission structure includes a first planetary row 2 and a second planetary row 3 arranged in the housing 1, and the first planetary row 2 and the second planetary row 3 are used to respectively transmit and connect two drive motors 200 and two wheels 300, and the first planetary row 2 and the second planetary row 3 are partially overlapped in the axial direction; in this way, by arranging the first planetary row 2 and the second planetary row 3 partially overlapped in the axial direction, the size occupied by the first planetary row 2 and the second planetary row 3 in the axial direction can be reduced, thereby reducing the axial size of the dual-motor drive system 1000, making it convenient to arrange more batteries to improve the battery life.

[0052] There are many forms of axial overlap of the first planetary row 2 and the second planetary row 3. For example, the first planetary row 2 and the second planetary row 3 may be completely radially distributed. The planetary row structure is circular as a whole. The radial juxtaposition of two circular structures as a whole will lead to more wasted space between the two planetary row structures. Moreover, the planetary row structure not only has gears, but also needs to be connected to the housing 1, the wheel 300 and the drive motor 200, which will lead to the overall structure of the reducer 100 being not compact. Although it can save space in the axial direction, it will waste a lot of space in the radial direction. In an embodiment of the present invention, the first planetary row 2 includes a first sun gear 21 rotatably mounted in the housing 1 along an axis extending laterally. The first sun gear 21 is used to be connected to one of the drive motors 200. The second planetary row 3 includes a second inner gear ring 31 arranged on the inner side of the first sun gear 21. In this way, the first sun gear 21 of the first planetary row 2 is sleeved on the second inner gear ring 31 of the second planetary row 3, so as to realize the embedding of the first planetary row 2 and the second planetary row 3. The structural arrangement is more reasonable, that is, it can save axial space while not occupying more radial space.

[0053] The second inner gear ring 31 and the first sun gear 21 can be coaxially arranged or non-coaxially arranged. However, when the second inner gear ring 31 and the first sun gear 21 are not coaxially arranged, even if the first sun gear 21 is sleeved on the outside of the second inner gear ring 31, the spacing between the two is uneven, which will also cause a lot of space waste. Therefore, in an embodiment of the present invention, the second inner gear ring 31 and the first sun gear 21 are coaxially arranged. In this way, while saving axial space, the radial space occupancy is minimized as much as possible.

[0054] It is understandable that, since the first sun gear 21 needs to be sleeved on the outer side of the second inner gear ring 31, the size of the first sun gear 21 is very large, the weight is relatively large, and the radial span of the connecting frame connected to the first sun gear 21 by the output shaft of the drive motor 200 is also large, which may cause the instability of the first sun gear 21 during the rotation process. Therefore, in the embodiment of the present invention, please refer to Figure 1 and Figure 2 The reducer 100 further includes a bearing 4 disposed between the second inner gear ring 31 and the first sun gear 21. The first sun gear 21 and the second inner gear ring 31 are connected by the bearing 4, so that the second inner gear ring 31 can support the first sun gear 21, improve the stability of the first sun gear 21 during rotation, and further improve the stability of the overall structure. Of course, the method of improving the stability of the rotation of the first sun gear 21 is not limited to this. A bracket can be extended from the side of the first sun gear 21, and then the bracket is rotatably connected to the housing 1, and the first sun gear 21 is supported by the housing 1 and the bracket. However, the extended bracket will occupy more space and affect the layout of the structure. Therefore, it is preferred to set the bearing 4 between the first sun gear 21 and the second inner gear ring 31 for support.

[0055] When power is input from the first sun gear 21, it can be output from the first inner ring gear 24 or the first planetary carrier 23. When power is output from the first inner ring gear 24, that is, the first inner ring gear 24 is rotatably installed in the housing 1, the first planetary carrier 23 needs to be locked by a locking mechanism. In the embodiment of the present application, the first planetary row 2 also includes a plurality of first planetary gears 22, a first planetary carrier 23 and a first inner gear ring 24, the plurality of first planetary gears 22 are respectively meshed with the outer sides of the first sun gear 21, the first planetary carrier 23 is connected to the plurality of first planetary gears 22, the inner side of the first inner gear ring 24 is meshed with the outer sides of the plurality of first planetary gears 22, and is fixedly connected to the housing 1, wherein the first planetary carrier 23 is used for transmission connection with the wheel 300 to drive the corresponding wheel 300 to rotate; in this way, the first sun gear 21 is driven to rotate by the drive motor 200, and under the action of the first sun gear 21 and the first inner gear ring 24, the plurality of first planetary gears 22 rotate around the first sun gear 21, thereby driving the rotation of the first planetary carrier 23, thereby outputting power, and using the first planetary carrier 23 as the output end, there is no need to additionally set a locking structure to lock the first planetary carrier 23, the structure is simpler, and the space occupied is small.

[0056] In order to transmit power from the first planetary carrier 23 to the corresponding wheel 300, in an embodiment of the invention, the first planetary row 2 also includes a first transmission gear 25 arranged on the first planetary carrier 23, and the reducer 100 also includes a first output shaft 5 whose axis is parallel to the first planetary carrier 23, and the first output shaft 5 is provided with a first output gear 6 meshing with the first transmission gear 25, and the first output shaft 5 is used to connect with the corresponding wheel 300, and the first planetary carrier 23 is provided with a first avoidance hole 231, and the first avoidance hole 231 is used for the motor shaft of the corresponding drive motor 200 to pass through the first planetary carrier 23 to the first planetary carrier 23. The first planetary carrier 23 is connected with the sun gear 21; in this way, when the first planetary carrier 23 rotates, the first transmission gear 25 is driven to rotate, and then the first output shaft 5 is driven to rotate through the engagement with the first output gear 6, thereby realizing the rotation of the wheel 300. The setting of the first avoidance hole 231 enables the output shaft of the drive motor 200 to pass through the first planetary carrier 23 to be connected to the first sun gear 21. Otherwise, the corresponding drive motor 200 needs to be set in the first planetary carrier 23, which will cause the first planetary carrier 23 to be set very large, occupying space while causing the weight of the overall reducer 100 to increase, which is not conducive to improving the vehicle's endurance.

[0057] When power is input from the second sun gear 34, power can be output from the second planetary carrier 33 or the second inner ring gear 31. When power is output from the second inner ring gear 31, that is, the second inner ring gear 31 is rotatably installed in the housing 1, the second planetary carrier 33 needs to be locked by a locking mechanism. The setting of the locking mechanism makes the structure of the overall second planetary gear 3 more complicated, requiring more space to arrange the structure, and the overall weight will also increase. Therefore, in the embodiment of the present invention, the second inner gear ring 31 is fixedly connected to the housing 1, and the second planetary gear 3 further includes a plurality of second planetary gears 32, a second planet carrier 33 and a second sun gear 34, wherein the plurality of second planetary gears 32 are respectively meshed with the inner side of the second inner gear ring 31, the second planet carrier 33 is connected with the plurality of second planetary gears 32, the second sun gear 34, and the plurality of second planetary gears 32 are respectively meshed with the outer side of the second sun gear 34, and the second sun gear 34 is used for driving connection with another driving motor 200; wherein the second planet carrier 33 is used for driving connection with the wheel 300 to drive the corresponding wheel 300 to rotate. In this arrangement, the second sun gear 34 is driven by the driving motor 200 to rotate, and under the action of the second sun gear 34 and the second inner gear ring 31, the plurality of second planetary gears 32 rotate around the second sun gear 34, thereby driving the rotation of the second planet carrier 33, thereby outputting power, and the second planet carrier 33 is used as the output end, and there is no need to set an additional locking structure to lock the second planet carrier 33, so the structure is simpler and the space occupation is small.

[0058] In order to transmit power from the second planetary carrier 33 to the corresponding wheel 300, in an embodiment of the invention, the second planetary row 3 also includes a second transmission gear 35 arranged on the second planetary carrier 33, and the reducer 100 also includes a second output shaft 7 whose axis is parallel to the axis of the second planetary carrier 33, and the second output shaft 7 is provided with a second output gear 8 meshing with the second transmission gear 35, and the second output shaft 7 is used to connect with the corresponding wheel 300, and the second planetary carrier 33 is provided with a second avoidance hole 331, and the second avoidance hole 331 is used for the corresponding drive motor 200 The motor shaft passes through the second planetary carrier 33 to be connected to the second sun gear 34; thus, when the second planetary carrier 33 rotates, it drives the second transmission gear 35 to rotate, and then drives the second output shaft 7 to rotate through engagement with the second output gear 8, thereby realizing the rotation of the wheel 300. The setting of the second avoidance hole 331 enables the output shaft of the drive motor 200 to pass through the second planetary carrier 33 to be connected to the second sun gear 34. As mentioned above, the second avoidance hole 331 can make the layout of the overall structure more compact and occupy less space, making it convenient to arrange more batteries in subsequent vehicles.

[0059] The present invention also provides a vehicle, which includes a dual-motor drive system 1000. The specific structure of the dual-motor drive system 1000 refers to the above embodiment. Since the vehicle adopts all the technical solutions of all the above embodiments, it at least has all the beneficial effects brought by the technical solutions of the above embodiments, which will not be described one by one here. The two drive motors 200 are respectively connected to the first planetary gear 2 and the second planetary gear 3.

[0060] In the technical solution of the embodiment of the present invention, in the technical solution of the present invention, the transmission structure includes a first planetary row 2 and a second planetary row 3 arranged in the shell 1, the first planetary row 2 and the second planetary row 3 are used to respectively transmit and connect two drive motors 200 and two wheels 300, and the first planetary row 2 and the second planetary row 3 are partially overlapped in the axial direction; in this way, by arranging the first planetary row 2 and the second planetary row 3 partially overlapped in the axial direction, the size occupied by the first planetary row 2 and the second planetary row 3 in the axial direction can be reduced, thereby reducing the axial size of the dual-motor drive system 1000, making it convenient to arrange more batteries to improve battery life.

[0061] The present invention also proposes a dual-motor drive system 1000, which includes two drive motors 200 and a reducer 100. The specific structure of the reducer 100 refers to the above-mentioned embodiment. Since the dual-motor drive system 1000 adopts all the technical solutions of all the above-mentioned embodiments, it has at least all the beneficial effects brought by the technical solutions of the above-mentioned embodiments, which will not be described one by one here.

[0062] In the technical solution of the embodiment of the present invention, in the technical solution of the present invention, the transmission structure includes a first planetary row 2 and a second planetary row 3 arranged in the shell 1, the first planetary row 2 and the second planetary row 3 are used to respectively transmit and connect two drive motors 200 and two wheels 300, and the first planetary row 2 and the second planetary row 3 are partially overlapped in the axial direction; in this way, by arranging the first planetary row 2 and the second planetary row 3 partially overlapped in the axial direction, the size occupied by the first planetary row 2 and the second planetary row 3 in the axial direction can be reduced, thereby reducing the axial size of the dual-motor drive system 1000, making it convenient to arrange more batteries to improve battery life.

[0063] The above description is only an exemplary embodiment of the present invention, and does not limit the patent scope of the present invention. All equivalent structural changes made by using the contents of the present invention specification and drawings under the technical concept of the present invention, or directly / indirectly applied in other related technical fields are included in the patent protection scope of the present invention.

Claims

1. A reducer, applied to a dual-motor drive system, characterized in that: include: case; as well as, The transmission structure includes a first planetary row and a second planetary row arranged in the housing, the first planetary row and the second planetary row are used to respectively drive and connect two drive motors and two wheels, and the first planetary row and the second planetary row are partially overlapped in the axial direction.

2. The reducer according to claim 1, characterized in that: The first planetary gear comprises a first sun gear rotatably mounted in the housing along an axis extending transversely, the first sun gear being used for driving connection with one of the driving motors; The second planetary gear set includes a second inner ring gear disposed inside the first sun gear.

3. The reducer according to claim 2, characterized in that: The second inner gear ring is arranged coaxially with the first sun gear.

4. The reducer according to claim 3, characterized in that: The speed reducer further includes a bearing disposed between the second internal gear ring and the first sun gear.

5. The reducer according to claim 2, characterized in that: The first planetary gear set further comprises: A plurality of first planetary gears are respectively meshed with the outer sides of the first sun gear; A first planet carrier, connected to the plurality of first planetary gears; A first inner gear ring, the inner side of which is meshed with the outer sides of the first planetary gears and is fixedly connected to the housing; Wherein, the first planet carrier is used for driving connection with the wheel to drive the corresponding wheel to rotate.

6. The reducer according to claim 5, characterized in that: The first planetary gear also includes a first transmission gear disposed on the first planetary carrier; The reducer further comprises a first output shaft whose axis is parallel to the first planet carrier, the first output shaft is provided with a first output gear meshing with the first transmission gear, and the first output shaft is used to connect with the corresponding wheel; The first planet carrier is provided with a first avoidance hole, and the first avoidance hole is used for allowing the motor shaft corresponding to the drive motor to pass through the first planet carrier to be connected with the first sun gear.

7. The reducer according to claim 2, characterized in that: The second inner gear ring is fixedly connected to the housing; The second planetary gear set further comprises: A plurality of second planetary gears are respectively meshed with the inner sides of the second inner gear ring; A second planet carrier, connecting a plurality of the second planetary gears; and A second sun gear, the plurality of second planetary gears are respectively meshed with the outer side of the second sun gear, and the second sun gear is used for driving connection with another of the driving motors; Wherein, the second planet carrier is used for driving connection with the wheel to drive the corresponding wheel to rotate.

8. The reducer according to claim 7, characterized in that: The second planetary gear also includes a second transmission gear disposed on the second planetary carrier; The reducer further comprises a second output shaft whose axis is parallel to the axis of the second planet carrier, the second output shaft is provided with a second output gear meshing with the second transmission gear, and the second output shaft is used to be connected to the corresponding wheel; The second planet carrier is provided with a second avoidance hole, and the second avoidance hole is used for allowing the motor shaft corresponding to the drive motor to pass through the second planet carrier to be connected with the second sun gear.

9. A dual-motor drive system, characterized in that: include: A reducer according to any one of claims 1 to 8; as well as, Two driving motors are drivingly connected to the first planetary gear and the second planetary gear respectively.

10. A vehicle, characterized in that: Comprising the dual-motor drive system as described in claim 9.

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