Motor electric drive axle

Abstract

The utility model relates to a motor electric drive axle which comprises at least one drive motor, at least one first-stage gear set, at least one second-stage gear set and a planet row assembly. The first-stage gear set comprises a first transmission shaft, a first driving gear, a second driving gear and a first gear shifting piece. The second-stage gear set comprises a second transmission shaft, and a first driven gear, a second driven gear and a second driving gear which are coaxially fixed on the second transmission shaft; the last-stage transmission assembly comprises a third transmission shaft, a last-stage transmission gear, a planet row and a second gear shifting piece. According to the electric drive axle, output of the first driving gear and output of power of the second driving gear can be selected through the first gear shifting part, first-layer gear shifting is achieved, the planet row is selectively introduced into the electric drive axle through the second gear shifting part, second-layer gear shifting is achieved, the two-layer gear shifting is combined to form the 2 * 2 four-gear effect, the structure is more compact, the number of parts is smaller, and the cost is lower. And the gear shifting operation is simpler.

Description

Technical Field

[0001] The utility model relates to the technical field of automobile drive axle structures, in particular to a motor electric drive axle. Background Art

[0002] From the perspective of the technical development trend of electric drive systems for new energy vehicles, the overall trend is towards the integration and integration of power systems. Automakers have integrated drive motors, gearboxes, reducers, axles, etc. as electric drive assembly products. Through integrated design, on the one hand, the volume and weight of the assembly can be further reduced, and the power, volume, and torque density of the system can be improved. On the other hand, through integration and refined matching, the NVH level of the electric drive assembly can be improved, which is convenient for serialization and mass production, and improves the versatility of the product and reduces development and production costs.

[0003] The electric drive axle in the prior art, whether it adopts a single motor or a dual motor structure, has the problem of complex gear shifting, which leads to numerous components and complex structure. It is necessary to improve its structure. Utility Model Content

[0004] Based on the above description, the utility model provides a motor electric drive bridge to solve the above technical problems.

[0005] The technical solution of the utility model to solve the above technical problems is as follows:

[0006] An electric motor drive axle, comprising at least one drive motor, at least one first-stage gear set, at least one second-stage gear set and a planetary gear assembly;

[0007] The first-stage gear set includes a first transmission shaft, a first driving gear, a second driving gear and a first shifting member; the driving motor is drivingly connected to the first rotating shaft, the first driving gear and the second driving gear are rotatably mounted on the first transmission shaft, and the first shifting member can select the first driving gear or the second driving gear to rotate with the first transmission shaft;

[0008] The second stage gear set comprises a second transmission shaft and a first driven gear, a second driven gear and a second driving gear coaxially fixed to the second transmission shaft, the first driven gear and the first driving gear meshing for transmission, and the second driven gear and the second driving gear meshing for transmission;

[0009] The final transmission assembly includes a third transmission shaft, a final transmission gear, a planetary gear and a second shifting member. The final transmission gear is coaxially fixed to the third transmission shaft and meshes with the second driving gear for transmission. The second shifting member can be used for shifting the corresponding planetary gear.

[0010] Compared with the prior art, the technical solution of this application has the following beneficial technical effects:

[0011] The motor-driven axle provided in the present application can be reasonably configured with different numbers of motor drives according to actual needs, and adopts a three-stage transmission design, wherein the first and second stages adopt gear transmission reduction, and the third stage adopts planetary gearbox reduction, wherein a first shifting member is adopted to realize the output of the first drive gear and the output of the power of the second drive gear, thereby realizing the first level of gear shifting, and a second shifting member is adopted to selectively introduce the planetary gearbox into the electric drive axle, thereby realizing the second level of gear shifting, and the two levels of gear shifting are combined to form a 2*2 4-gear effect, and gear switching is realized directly on the planetary gearbox and the first transmission shaft, without the need to be equipped with a gear shifting module of a traditional planetary reduction module, and its structure is more compact, with fewer parts and components, and the gear shifting operation is also simpler.

[0012] On the basis of the above technical solution, the present invention can also be improved as follows.

[0013] Furthermore, the second shift member includes a shift sleeve axially slidably installed on the third transmission shaft, the planetary gear includes a ring gear, a sun gear, a planetary gear and a planetary carrier, the ring gear is fixedly arranged, the sun gear is coaxially movably connected to the third rotating shaft, and the shift sleeve slides to make the final transmission gear idle or rotate synchronously with the sun gear of the planetary gear or the planetary carrier of the planetary gear.

[0014] Furthermore, the first shift member includes a shift fork axially slidably mounted on the first transmission shaft.

[0015] Furthermore, the first driving gear and the second driving gear are not equal in size and number of teeth.

[0016] Furthermore, a transmission ratio between the first driving gear and the first driven gear is not equal to a transmission ratio between the second driving gear and the second driven gear.

[0017] Furthermore, the number of the driving motor, the first-stage gear set, and the second-stage gear set are all two, and the second driving gears of the two second-stage gear sets are respectively located on both sides of the final-stage transmission gear.

[0018] Furthermore, the first driving gear, the second driving gear, the first driven gear, the second driven gear, the second driving gear and the final transmission gear are all cylindrical gears. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 A schematic diagram of the structure of the first motor electric drive bridge provided in the embodiment of the present application;

[0020] Figure 2A schematic diagram of the structure of the second motor electric drive bridge provided in an embodiment of the present application. DETAILED DESCRIPTION

[0021] In order to facilitate understanding of the present application, the present application will be described more fully below with reference to the relevant drawings. Embodiments of the present application are provided in the drawings. However, the present application can be implemented in many different forms and is not limited to the embodiments described herein. On the contrary, the purpose of providing these embodiments is to make the disclosure of the present application more thorough and comprehensive.

[0022] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as those commonly understood by those skilled in the art to which this application belongs. The terms used herein in the specification of this application are only for the purpose of describing specific embodiments and are not intended to limit this application.

[0023] It will be appreciated that spatial relationship terms such as "under", "beneath", "below", "under", "above", "above", etc., may be used herein to describe the relationship of an element or feature shown in the figures to other elements or features. It will be appreciated that, in addition to the orientations shown in the figures, spatial relationship terms also include different orientations of the device in use and operation. For example, if the device in the accompanying drawings is flipped, an element or feature described as "under other elements" or "under it" or "under it" will be oriented as being "on" the other elements or features. Thus, the exemplary terms "under" and "under" may include both upper and lower orientations. In addition, the device may also include additional orientations (e.g., rotated 90 degrees or other orientations), and the spatial descriptors used herein are interpreted accordingly.

[0024] It should be noted that when an element is considered to be "connected" to another element, it can be directly connected to the other element, or connected to the other element through an intermediate element. The "connection" in the following embodiments should be understood as "electrical connection", "communication connection", etc. if the connected circuits, modules, units, etc. have electrical signals or data transmission between each other.

[0025] When used herein, the singular forms "a", "an", and "said / the" may also include plural forms, unless the context clearly indicates otherwise. It should also be understood that the terms "include / comprise" or "have" etc. specify the presence of stated features, wholes, steps, operations, components, parts or combinations thereof, but do not exclude the possibility of the presence or addition of one or more other features, wholes, steps, operations, components, parts or combinations thereof.

[0026] like Figure 1As shown, the embodiment of the present application provides an embodiment of a first motor electric drive bridge, which adopts a single-motor drive solution, including a drive motor 10, a first-stage gear set 20, a second-stage gear set 30 and a planetary gear assembly 40.

[0027] The first-stage gear set 20 includes a first transmission shaft 21 , a first driving gear 22 , a second driving gear 23 and a first shifting member.

[0028] The driving motor 10 is drivingly connected to the first rotating shaft 21, and the first driving gear 22 and the second driving gear 23 are rotatably installed on the first transmission shaft 21. The rotatable connection method can be realized by bearings or rolling sleeves; the first shift member 24 can selectively make the first driving gear 22 or the second driving gear 23 rotate with the first transmission shaft 21.

[0029] Preferably, the first drive gear 22 and the second drive gear 23 are not equal in size and number of teeth. In this embodiment, the radius of the first drive gear 22 is greater than the radius of the second drive gear 23, and the first shift member includes a shift fork 24 axially slidably mounted on the first transmission shaft 21, and the first transmission shaft 21 is connected to the first drive gear 22 or the second drive gear 23 for transmission through the axial sliding of the shift fork 24 on the first transmission shaft 21.

[0030] The second-stage gear set 30 includes a second transmission shaft 31 and a first driven gear 32, a second driven gear 33 and a second driving gear 34 coaxially fixed to the second transmission shaft 31. Preferably, the first driven gear 32, the second driven gear 33 and the second driving gear 34 are fixed to the second transmission shaft 31 by a key connection and rotate synchronously with the second transmission shaft 31.

[0031] The first driven gear 32 and the first driving gear 22 are meshed for transmission, and the second driven gear 33 and the second driving gear 23 are meshed for transmission.

[0032] Preferably, the transmission ratio of the first driving gear 22 and the first driven gear 32 is not equal to the transmission ratio of the second driving gear 23 and the second driven gear 33, so as to ensure the shifting effect, and the second driving gear 34 is used to transmit power to the next level.

[0033] The final transmission assembly 40 includes a third transmission shaft 41 , a final transmission gear 42 , a planetary gear 43 and a second shifting member 44 . The final transmission gear 42 is coaxially fixed to the third transmission shaft 41 and meshes with the second driving gear 34 for transmission. The second shifting member 44 can be used for shifting the planetary gear 43 .

[0034] The second shift member includes a shift sleeve 44 axially slidably mounted on the third transmission shaft 41. Figure 2 As shown in the figure, the planetary row 43 includes a ring gear 431, a sun gear 432, a planetary gear 433 and a planetary carrier 434. The ring gear 431 is fixedly arranged, and the sun gear 432 is fixedly connected to the third rotating shaft 41. The shift sleeve 44 slides to make the final drive gear 42 idle or rotate synchronously with the sun gear 432 of the planetary row 43 or rotate synchronously with the planetary carrier 434 of the planetary row 43.

[0035] Specifically, the middle part of the final transmission gear 42 has a sliding rod portion extending axially, and the shift sleeve 44 is axially slidably arranged on the sliding rod portion in the form of a spline. The shift sleeve 44 can rotate synchronously with the final transmission gear 42, and the shift sleeve 44 can slide and be synchronously connected with the third rotating shaft 41, or synchronously connected with the planetary carrier 434.

[0036] When the shift sleeve 44 is connected neither to the third transmission shaft 41 nor to the planetary carrier 434 , the final transmission gear 42 is idling, and the electric drive axle is in a neutral state, which can effectively reduce oil stirring losses.

[0037] When the shift sleeve 44 is connected to the third transmission shaft 41, the final transmission gear 42 rotates synchronously with the sun gear 432, and the electric drive axle is in the first gear state, which can effectively increase the torque, the climbing ability and the starting speed;

[0038] When the shift sleeve 44 is connected to the planet carrier 434 , the final drive gear 42 and the planet carrier 434 of the planetary gear 43 rotate synchronously, and the electric drive axle is in a direct gear state, which can increase efficiency and ensure stable and high-speed operation of the vehicle.

[0039] The first driving gear 22 , the second driving gear 23 , the first driven gear 32 , the second driven gear 33 , the second driving gear 34 and the final transmission gear 42 are all cylindrical gears.

[0040] like Figure 2 As shown, it is an embodiment of the second motor electric drive bridge provided in the embodiment of the present application, which adopts a dual-motor drive solution, which is roughly the same as the first one, except that the number of clicks and gears is different. The number of the drive motor 10, the first-stage driving gear 20, the first-stage gear set 20 and the second-stage gear set 30 is two, wherein the two second driving gears 34 are respectively engaged with the two sides of the final transmission gear 50. According to the actual situation, different motor drives are adopted to realize more gear switching, enrich the driving mode, and enhance the driving experience.

[0041] It is understandable that the two sets of drive motors 10 and the corresponding gears can adopt different parameters and specifications according to actual needs, all within the scope of protection of this profession.

[0042] The motor-driven axle provided in the present application can be reasonably configured with different numbers of motor drives according to actual needs, and adopts a three-stage transmission design, wherein the first and second stages adopt gear transmission reduction, and the third stage adopts planetary gearbox reduction, wherein a first shifting member is adopted to realize the output of the first drive gear and the output of the power of the second drive gear, thereby realizing the first level of gear shifting, and a second shifting member is adopted to selectively introduce the planetary gearbox into the electric drive axle, thereby realizing the second level of gear shifting, and the two levels of gear shifting are combined to form a 2*2 4-gear effect, and gear switching is realized directly on the planetary gearbox and the first transmission shaft, without the need to be equipped with a gear shifting module of a traditional planetary reduction module, and its structure is more compact, with fewer parts and components, and the gear shifting operation is also simpler.

[0043] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A motor drive bridge, characterized in that: comprising at least one drive motor, at least one first-stage gear set, at least one second-stage gear set and a planetary gear assembly; The first-stage gear set includes a first transmission shaft, a first driving gear, a second driving gear and a first shifting member; the driving motor is drivingly connected to the first transmission shaft, the first driving gear and the second driving gear are rotatably mounted on the first transmission shaft, and the first shifting member can selectively make the first driving gear or the second driving gear rotate with the first transmission shaft; The second stage gear set comprises a second transmission shaft and a first driven gear, a second driven gear and a second driving gear coaxially fixed to the second transmission shaft, the first driven gear and the first driving gear meshing for transmission, and the second driven gear and the second driving gear meshing for transmission; The planetary gear assembly includes a third transmission shaft, a final transmission gear, a planetary gear and a second shifting member. The final transmission gear is coaxially movably connected to the third transmission shaft and meshes with the second driving gear for transmission. The second shifting member can be used for shifting the planetary gear.

2. The motor drive bridge according to claim 1, characterized in that: The second shift member includes a shift sleeve axially slidably installed on the third transmission shaft, the planetary gear includes a ring gear, a sun gear, a planetary gear and a planetary carrier, the ring gear is fixedly arranged, the sun gear is coaxially movably connected to the third transmission shaft, and the shift sleeve slides to make the final transmission gear idle or rotate synchronously with the sun gear of the planetary gear or the planetary carrier of the planetary gear.

3. The motor drive bridge according to claim 1, characterized in that: The first shift member includes a shift fork axially slidably mounted on the first transmission shaft.

4. The motor drive bridge according to claim 1, characterized in that: The first driving gear and the second driving gear are not equal in size and number of teeth.

5. The motor drive bridge according to claim 1, characterized in that: The transmission ratio of the first driving gear and the first driven gear is not equal to the transmission ratio of the second driving gear and the second driven gear.

6. The motor drive bridge according to claim 1, characterized in that: The number of the driving motor, the first-stage gear set, and the second-stage gear set are all two, and the second driving gears of the two second-stage gear sets are respectively located on both sides of the final-stage transmission gear.

7. The motor drive bridge according to claim 1, characterized in that: The first driving gear, the second driving gear, the first driven gear, the second driven gear, the second driving gear and the final transmission gear are all cylindrical gears.

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