Integrated coaxial electric drive axle

Abstract

The utility model discloses an integrated coaxial electric drive axle which comprises a drive motor, a controller and a speed reducer assembly, the drive motor is arranged in a motor shell and comprises an output shaft, and the speed reducer assembly comprises a speed reducer shell connected with the motor shell. The speed reducer assembly comprises an input gear, a transmission gear, a gear shaft coaxially arranged in the transmission gear in a penetrating mode and a differential mechanism assembly meshed with the gear shaft, the input gear is integrated at one end of the output shaft, the transmission gear is connected with the output shaft through the input gear, and first cooling fins are arranged on the peripheral face of the motor shell at equal angles; the controller is arranged on the top of the speed reducer shell, second cooling fins are arranged on the top of the controller in parallel, and a wiring terminal of the driving motor and the power output interface are arranged on the same side and connected with each other. According to the electric drive axle, the occupied space is reduced, the arrangement requirement of the electric drive axle of a small vehicle is better met, the heat dissipation channels do not interfere with one another, and the safety of wiring of the drive motor and the controller is ensured.

Description

Technical Field

[0001] The utility model relates to the field of electric drive axles, and particularly to an integrated coaxial electric drive axle. Background Art

[0002] The integrated electric drive axle is mainly composed of a drive motor connected to a gearbox, eliminating the traditional drive shaft. Using a single motor as the power source, the power is directly transmitted to the wheels, reducing the number of components and making the structure simpler. At the same time, due to the high integration of components, the structure is compact and occupies less space, making it easier to arrange the whole vehicle, especially suitable for small cars and other small vehicles (such as logistics vehicles, etc.).

[0003] In some existing integrated electric drive axles, the controller of the drive motor is usually integrated on the drive motor. For example, the utility model patent with the authorization announcement number CN211791098U provides a three-in-one motor assembly, including an integrated motor, a reducer, and a motor controller. A heat dissipation housing is sleeved on the motor controller. In this kind of integrated structure, since the motor, the reducer, and the controller are highly integrated, the heat dissipated by the three is relatively concentrated. Therefore, in addition to setting a heat dissipation structure on the controller housing, it is usually necessary to set a heat dissipation structure inside the motor and / or outside the motor housing. When an air-cooling structure is also set on the motor housing, the air-cooling channels formed between the air-cooling structure (heat dissipation structure) on the motor housing and the heat dissipation mechanism outside the controller are prone to interfere with each other, thus affecting the heat dissipation effect of the overall structure. However, at the same time, to avoid interference between the controller and the external air duct of the motor, a certain distance needs to be maintained between the motor and the controller. However, there will also be a relatively large wiring distance between the wiring terminal of the drive motor and the power output interface of the controller, thus affecting the stability of their electrical connection. In addition, increasing the interval distance between the motor and the controller is also likely to affect the integration degree of the overall structure and increase the space occupation. Summary of the Utility Model

[0004] Therefore, to solve the above problems, the utility model provides an integrated coaxial electric drive axle.

[0005] The utility model is realized through the following technical solutions:

[0006] Integrated coaxial electric drive axle, including a drive motor, a controller, and a reducer assembly. The drive motor is arranged inside a motor housing. The drive motor includes an output shaft. The reducer assembly includes a reducer housing connected to the motor housing. The reducer assembly includes an input gear, a transmission gear, a gear shaft coaxially passing through the transmission gear, and a differential assembly meshing with the gear shaft. One end of the output shaft integrates the input gear of the reducer assembly. The transmission gear is connected to the output shaft through the input gear. First heat dissipation fins are arranged on the outer peripheral surface of the motor housing at equal angles. A first heat dissipation channel is formed between adjacent two first heat dissipation fins and is arranged along the axial direction of the motor. The controller is arranged on the top of the reducer housing. Second heat dissipation fins are arranged in parallel on the top of the controller. A second heat dissipation channel is formed between adjacent two second heat dissipation fins. The power output interface of the controller is arranged on one side close to the drive motor. The wiring terminal of the drive motor is arranged on the same side as the power output interface and is connected to each other.

[0007] Preferably, a first flange surface is arranged on the connection side of the motor housing and the reducer housing. A second flange surface is arranged on the connection side of the reducer housing and the motor housing. The first flange surface is in contact with the second flange surface, and the two are fixed through first bolts.

[0008] Preferably, each of the motor housing and the reducer housing is further connected to a bridge tube. The two bridge tubes are coaxially arranged, and each bridge tube is respectively connected to a wheel end.

[0009] Preferably, the wiring terminal is vertically arranged on one side of the drive motor close to the controller and is connected to the power output interface at its top.

[0010] Preferably, a wiring protection shell is further arranged on one side of the motor housing close to the controller. The wiring protection shell wraps the outside of the wiring terminal and the power output interface and is fixed to the controller through second bolts.

[0011] Preferably, the input gear is integrally arranged on the outer peripheral surface of the output shaft of the drive motor. The reducer assembly further includes an output gear and a driven gear. The output gear is arranged on the outer peripheral surface of the gear shaft. The driven gear is arranged on the outer periphery of the differential assembly and meshes with the output gear.

[0012] Preferably, both ends of the output shaft are respectively connected to the motor housing through two first bearings.

[0013] Preferably, one end of the gear shaft passes through the transmission gear and is connected to the reducer housing through a second bearing. The other end of the gear shaft is connected to the reducer housing through a third bearing.

[0014] Preferably, the output shaft of the drive motor is a hollow shaft, and a long half shaft is coaxially inserted into the output shaft. One end of the long half shaft is connected to the differential assembly, and the other end of the differential assembly is also connected to a short half shaft.

[0015] Preferably, both ends of the differential assembly are connected to the reducer housing through two fourth bearings respectively.

[0016] The beneficial effects of the technical solution of the present utility model are mainly reflected in:

[0017] 1. The outer peripheral surface of the motor housing forms a first heat dissipation channel. The controller is arranged on the top of the reducer housing, and the top of the controller forms a second heat dissipation channel. The first heat dissipation channel and the second heat dissipation channel are at different heights and different positions, and the two heat dissipation channels do not interfere with each other, and will not affect the overall heat dissipation effect.

[0018] 2. The power output interface of the controller and the wiring terminal of the drive motor are arranged on the same side and connected to each other, which shortens the conductive wiring distance between the controller and the drive motor as much as possible. At the same time, a wiring protection shell is also arranged outside the wiring terminal and the power output interface to ensure the safety performance of their connection.

[0019] 3. The drive motor and the reducer assembly adopt an integrated coaxial arrangement. The output shaft of the motor directly integrates the transmission gear of the reducer, which simplifies the overall structure of the electric drive axle, reduces the space occupation, improves the key performance indicators such as the noise, vibration and driving comfort of the whole vehicle, and is more suitable for the layout requirements of the electric drive axle of small vehicles. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 is a perspective view of the integrated coaxial electric drive axle;

[0021] Figure 2 is a top view of the integrated coaxial electric drive axle;

[0022] Figure 3 is a side view of the drive motor, controller and reducer assembly;

[0023] Figure 4 is Figure 3 a cross-sectional view taken along A-A in

[0024] Figure 5 is a perspective view of the drive motor, controller and reducer assembly;

[0025] Figure 6 is a front view of the drive motor, controller and reducer assembly. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0026] To clearly and detailedly illustrate the objectives, advantages and features of the present utility model, the following non-restrictive description of the preferred embodiments will be used for illustration and explanation. This embodiment is only a typical example of applying the technical solution of the present utility model, and any technical solution formed by equivalent replacement or equivalent transformation falls within the scope of protection required by the present utility model.

[0027] At the same time, it is stated that in the description of the solution, it should be noted that the orientation or positional relationship indicated by the terms "center", "upper", "lower", "left", "right", "front", "rear", "inner", "outer", etc. is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of description and simplification of the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation of the present utility model.

[0028] In addition, the terms "first" and "second" in this solution are only used for descriptive purposes and cannot be understood as indicating or implying the ranking of importance or implicitly indicating the quantity of the technical features shown. Therefore, the features defined with "first" and "second" may explicitly or implicitly include one or more of such features. In the present utility model, the meaning of "a plurality" is two or more, unless otherwise specifically defined.

[0029] The present utility model discloses an integrated coaxial electric drive axle, such as Figure 1 、 Figure 2As shown, it includes a drive motor 1, a controller 2, and a reducer assembly 3. The drive motor 1 and the reducer assembly 3 are arranged coaxially in an integrated manner. The drive motor 1 is disposed within a motor housing 101. The drive motor 1 includes an output shaft 103. The reducer assembly 3 includes a reducer housing 301 connected to the motor housing 101. The reducer assembly 3 includes an input gear 104, a transmission gear 302, a gear shaft 303 coaxially passing through the transmission gear 302, and a differential assembly 14 meshing with the gear shaft 303. One end of the output shaft 103 close to the reducer housing 301 integrally forms the input gear 104 of the reducer assembly 3. The transmission gear 302 meshes with the input gear 104, such that the transmission gear 302 is connected to the output shaft 103 through the input gear 104. On the outer peripheral surface of the motor housing 101, first heat dissipation fins 4 are arranged at equal angles. A first heat dissipation channel is formed between adjacent two first heat dissipation fins 4 and is arranged along the axial direction of the motor. The controller 2 is disposed on the top of the reducer housing 301. Second heat dissipation fins 5 are arranged in parallel on the top of the controller 2. A second heat dissipation channel is formed between adjacent two second heat dissipation fins 5. Since the controller 2 is disposed on the top of the reducer housing 301 and the second heat dissipation channel is located on the top of the controller 2, the first heat dissipation channel and the second heat dissipation channel are at different height positions and do not interfere with each other.

[0030] In an embodiment, the input gear 104 is integrally disposed on the outer peripheral surface of the output shaft 103 of the drive motor 1. The reducer assembly 3 further includes an output gear 304 and a driven gear 305. The output gear 304 is disposed on the outer peripheral surface of the gear shaft 303. In a preferred embodiment, the output gear 304 is integrally disposed on the outer peripheral surface of the gear shaft 303. The driven gear 305 is disposed on the outer periphery of the differential assembly 14 and meshes with the output gear 304.

[0031] As Figure 1 、 Figure 2 、 Figure 5As shown, the power output interface 201 of the controller 2 is arranged on the side close to the drive motor 1. The wiring terminal 102 of the drive motor 1 is arranged on the same side as the power output interface 201 and is connected to each other, which is beneficial to reducing the conductive connection distance between the two and reducing the risk of poor contact caused by too long connection lines. In a preferred embodiment, the wiring terminal 102 is vertically upward arranged on the side of the drive motor 1 close to the controller 2 and is connected to the power output interface 201 at its top. A wiring protection shell 6 is also arranged on the side of the motor housing 101 close to the controller 2. The wiring protection shell 6 wraps the outside of the wiring terminal 102 and the power output interface 201 and is fixed to the controller 2 by a second bolt 8. The wiring terminal 102 and the power output interface 201 are hermetically protected by the wiring protection shell 6 to ensure the safety performance of their conductive connection.

[0032] As Figure 1 , Figure 6 shown, in some embodiments, a first flange surface is arranged on the connection side of the motor housing 101 and the reducer housing 301. A second flange surface is arranged on the connection side of the reducer housing 301 and the motor housing 101. The first flange surface and the second flange surface are fitted together and are fixed by a first bolt 7. Among them, the motor housing 101 and the reducer housing 301 are also respectively connected with a bridge pipe 9. The two bridge pipes 9 are coaxially arranged, and each bridge pipe 9 is respectively connected with a wheel end. In one embodiment, assembly holes for installing the bridge pipe 9 are respectively arranged on the motor housing 101 and the reducer housing 301. The bridge pipe 9 is inserted into the assembly hole for fixation. The bridge pipe 9 can also be further fixed by positioning structures such as bolts or buckles, which will not be elaborated here.

[0033] As Figure 3 , Figure 4As shown, in some embodiments, both ends of the output shaft 103 are connected to the motor housing 101 through two first bearings 10. One end of the gear shaft 303 passes through the transmission gear 302 and is connected to the reducer housing 301 through a second bearing 11. The other end of the gear shaft 303 is connected to the reducer housing 301 through a third bearing 12. In a preferred embodiment, the output shaft 103 of the drive motor 1 is a hollow shaft, and a long half shaft (not shown in the figure) is coaxially disposed inside the output shaft 103. The long half shaft is connected to one end of the differential assembly 14, and the other end of the differential assembly 14 is also connected to a short half shaft (not shown in the figure). Among them, the long half shaft extends to the outside of the motor housing 101, passes through the axle tube 9 connected to the motor housing 101, and then is connected to one side wheel end; the short half shaft extends to the outside of the reducer housing 301, passes through the axle tube 9 connected to the reducer housing 301, and then is connected to the other side wheel end. Both ends of the differential assembly 14 are respectively connected to the reducer housing 301 through two fourth bearings 13, so as to ensure the stability of the differential assembly 14 in the reducer housing 301 and the stability of the connection of the two half shafts.

[0034] There are still various implementation manners of the present utility model. All technical solutions formed by equivalent transformation or equivalent substitution fall within the protection scope of the present utility model.

Claims

1. An integrated coaxial electric drive axle, including a drive motor, a controller and a reducer assembly, characterized in that: The drive motor is arranged in a motor housing, the drive motor includes an output shaft, the reducer assembly includes a reducer housing connected to the motor housing, the reducer assembly includes an input gear, a transmission gear, a gear shaft coaxially arranged in the transmission gear, and a differential assembly meshing with the gear shaft, one end of the output shaft is integrated with the input gear of the reducer assembly, the transmission gear is connected to the output shaft through the input gear, first heat sinks are arranged at equal angles on the outer peripheral surface of the motor housing, and a first heat dissipation channel arranged along the axial direction of the motor is formed between two adjacent first heat sinks, the controller is arranged on the top of the reducer housing, second heat sinks are arranged in parallel on the top of the controller, and a second heat dissipation channel is formed between two adjacent second heat sinks, the power output interface of the controller is arranged on a side close to the drive motor, and the wiring terminals of the drive motor are arranged on the same side as the power output interface and are connected to each other.

2. The integrated coaxial electric drive axle according to claim 1, characterized in that: A first flange surface is provided on the connection side between the motor housing and the reducer housing, and a second flange surface is provided on the connection side between the reducer housing and the motor housing. The first flange surface fits the second flange surface and is fixed therebetween by a first bolt.

3. The integrated coaxial electric drive axle according to claim 2, characterized in that: The motor housing and the reducer housing are also respectively connected to a bridge tube, the two bridge tubes are coaxially arranged, and each bridge tube is respectively connected to a wheel end.

4. The integrated coaxial electric drive axle according to claim 1, characterized in that: The connection terminal is vertically arranged upward on a side of the driving motor close to the controller and is connected to a power output interface at the top thereof.

5. The integrated coaxial electric drive axle according to claim 4, characterized in that: The motor housing is further provided with a wiring protection shell on a side close to the controller. The wiring protection shell wraps around the outside of the wiring terminal and the power output interface and is fixed to the controller by a second bolt.

6. The integrated coaxial electric drive axle according to claim 1, characterized in that: The input gear is integrally arranged on the outer peripheral surface of the output shaft of the driving motor. The reducer assembly also includes an output gear and a driven gear. The output gear is arranged on the outer peripheral surface of the gear shaft. The driven gear is arranged on the outer periphery of the differential assembly and meshes with the output gear.

7. The integrated coaxial electric drive axle according to claim 6, characterized in that: The two ends of the output shaft are respectively connected to the motor housing through two first bearings.

8. The integrated coaxial electric drive axle according to claim 6, characterized in that: One end of the gear shaft passes through the transmission gear and is connected to the reducer housing through a second bearing, and the other end of the gear shaft is connected to the reducer housing through a third bearing.

9. The integrated coaxial electric drive axle according to claim 8, characterized in that: The output shaft of the driving motor is a hollow shaft, a long semi-shaft is coaxially passed through the output shaft, the long semi-shaft is connected to one end of the differential assembly, and the other end of the differential assembly is also connected to a short semi-shaft.

10. The integrated coaxial electric drive axle according to claim 9, characterized in that: The two ends of the differential assembly are respectively connected to the reducer housing through two fourth bearings.

Images