Electric drive axle assembly

Abstract

The utility model discloses an electric drive axle assembly, including axle housing, two half axle, drive motor, speed reducer and differential mechanism, two half axle rotation is connected in the inner chamber of axle housing, drive motor is connected in the rear side of axle housing, speed reducer is connected in the front side of axle housing, including with axle housing front side fixed connection's reduction shell and through bearing rotation connection in the drive gear and output shaft of reduction shell inner chamber, the rear end of drive gear is rotationally connected with input shaft through the bearing, and input shaft passes through axle housing to the rear and is connected with the output end of drive motor, and the front end, rear end of output shaft are equipped with driven gear, bevel gear respectively, and driven gear is engaged with drive gear, differential mechanism is located in the inner chamber of axle housing and is connected with two half axle respectively at both ends, and differential mechanism includes the disc tooth that is engaged with driven gear. Through this structural design, the radial dimension of electric drive axle can be reduced, thereby reducing the volume, making the compact structure.

Description

Technical Field

[0001] This utility model relates to the field of drive axle technology, specifically to an electric drive axle assembly. Background Technology

[0002] Existing electric drive axles for heavy-duty vehicles include an axle housing, two half-shafts, a reducer, a differential, and a motor. The two half-shafts are housed within the axle housing. The reducer is connected to the front of the axle housing and includes a reducer housing and an input shaft and an intermediate shaft housed within the reducer housing. The intermediate shaft is located between the input shaft and the half-shafts, and its gear meshes with the gear on the input shaft. The two ends of the differential are connected to the two half-shafts respectively, and the differential's disc gear meshes with the gear on the intermediate shaft. The motor is connected to the reducer, and its output end is connected to the input shaft to achieve power transmission. However, the structure of the above-mentioned electric drive axle is not compact enough, resulting in a large required installation space. Utility Model Content

[0003] In view of the shortcomings of the prior art, the purpose of this utility model is to provide an electric drive axle assembly that reduces the radial dimension of the electric drive axle by connecting the drive motor and the reducer to the rear and front sides of the axle housing respectively, so as to make the structure compact.

[0004] To achieve the above objectives, the embodiments of this utility model adopt the following technical solutions:

[0005] The electric drive axle assembly includes an axle housing, two half-shafts, a drive motor, a reducer, and a differential.

[0006] The two half-shafts are rotatably connected to the inner cavity of the bridge housing;

[0007] The drive motor is connected to the rear side of the bridge housing;

[0008] The reducer is connected to the front side of the axle housing and includes a reducer housing fixedly connected to the front side of the axle housing, a drive gear and an output shaft rotatably connected to the inner cavity of the reducer housing via bearings. The rear end of the drive gear is rotatably connected to an input shaft via bearings. The input shaft passes rearward through the axle housing and is connected to the output end of the drive motor. The front end and rear end of the output shaft are respectively provided with a driven gear and a bevel gear. The driven gear meshes with the drive gear.

[0009] The differential is located in the inner cavity of the axle housing and its two ends are respectively connected to the two half shafts. The differential includes disc teeth that mesh with the driven gear.

[0010] Furthermore, the drive motor is fixedly connected to the rear side wall of the axle housing, and the two are perpendicular to each other.

[0011] Furthermore, it includes a rear cover located between the rear side of the axle housing and the drive motor, wherein a front flange and a rear flange are formed on the front and rear sides of the rear cover, respectively; the front flange is fixedly connected to the rear sidewall of the axle housing, and the rear flange is fixedly connected to the front sidewall of the drive motor.

[0012] Furthermore, the outer surface of the rear cover protrudes outward to form a plurality of upper heat sinks located between the front flange and the rear flange. Each upper heat sink extends downward and has a lower extension located below the rear flange. Each lower extension extends rearward along the axial direction of the input shaft to form a lower heat sink. The plurality of lower heat sinks are located below the drive motor and in contact with the motor.

[0013] Furthermore, the plurality of upper heat sinks extend axially along the input shaft and are radially distributed along the input shaft. The rear cover also includes a support plate, which is fixedly connected to the top surface of the plurality of lower heat sinks. The top surface of the support plate is adapted to the shape of the lower surface of the drive motor and contacts the lower surface of the drive motor. The front flange, the rear flange, the plurality of upper heat sinks, the plurality of lower heat sinks and the rear cover are integrally formed.

[0014] Furthermore, the reducer includes a first gear assembly, a second gear assembly, and a sliding engagement sleeve disposed within the inner cavity of the reducer housing. The first gear assembly includes the driving gear and the input shaft. The second gear assembly includes an input gear located behind the driving gear and disposed on the input shaft. The sliding engagement sleeve is located between the driving gear and the input gear and can mesh with the driving gear and / or the input gear axially via a spline on the input shaft.

[0015] Furthermore, the input gear is integrally formed with the input shaft, and the sliding engagement sleeve is slidably connected to the drive gear in the axial direction of the input shaft via a spline, and its outer peripheral wall is recessed with an annular groove. The groove engages with the synchronizer's shift fork to drive the sliding engagement sleeve to slide in the axial direction of the input shaft to engage or disengage with the input gear.

[0016] Furthermore, the input shaft is located above and perpendicular to the half shaft, the output shaft is located below the input shaft and the two are parallel, a power take-off pump is connected to the front side wall of the reducer corresponding to the front side of the output shaft, the input end of the power take-off pump extends into the inner cavity of the reducer housing and is connected to the output shaft through a spline, and a controller is integrated below the drive motor.

[0017] The electric drive axle assembly of this utility model connects the drive motor and the reducer to the rear and front sides of the axle housing, respectively. On the one hand, it can reduce the radial dimension of the electric drive axle, thereby reducing the volume and making the structure compact, and the drive motor has a large efficient working range. On the other hand, it is not only convenient to install, but also the electric drive axle has a balanced front and rear weight distribution, that is, a balanced force, which can improve the vehicle's power and balance. Attached Figure Description

[0018] Figure 1 This is a perspective view of the electric drive axle assembly according to an embodiment of the present utility model;

[0019] Figure 2 for Figure 1 A sectional view;

[0020] Figure 3 for Figure 1 A three-dimensional diagram of the back cover from another perspective. Detailed Implementation

[0021] The present invention will now be further described in conjunction with the accompanying drawings and specific embodiments:

[0022] like Figures 1 to 3 As shown, this utility model embodiment provides an electric drive axle assembly for use in heavy vehicles, including an axle housing 1, two half-shafts 2, a drive motor 3, a reducer 4, a differential 5, and a rear cover 11.

[0023] The two half-shafts 2 are rotatably connected to the inner cavity of the axle housing 1. The drive motor 3 is connected to the rear side of the axle housing 1. Specifically, the drive motor 3 is fixedly connected to the rear side wall (end of the axle housing) of the axle housing 1 and the two are perpendicular. That is, the drive motor 3 is vertically mounted on the axle housing 1, which not only improves heat dissipation and working efficiency, but also facilitates the replacement of the drive motor 3 by the OEM as needed, as well as subsequent maintenance and repair. To facilitate the operation of the drive motor 3, a controller is integrated below the drive motor 3.

[0024] The reducer 4 is connected to the front side of the axle housing 1 and includes a reducer housing 41 fixedly connected to the front side of the axle housing 1 by bolts, and a drive gear 42 and an output shaft 43 rotatably connected to the inner cavity of the reducer housing 41 by bearings. The rear end of the drive gear 42 is rotatably connected to an input shaft 40 by bearings. The input shaft 40 passes through the axle housing 1 and is connected to the output end 31 of the drive motor 3. The input shaft 40 is located above the half shaft 2 and is perpendicular to the half shaft 2. The output shaft 43 is located below the input shaft 40 and the two are parallel. The front end and rear end of the output shaft 43 are respectively provided with a driven gear 431 and a bevel gear 432. The driven gear 431 meshes with the drive gear 42.

[0025] Specifically, the reducer 4 includes a first gear assembly, a second gear assembly, and a sliding engagement sleeve 44 disposed within the inner cavity of the reducer housing 41. The first gear assembly is a high-speed gear structure, and the second gear assembly is a low-speed gear structure. The first gear assembly includes the drive gear 42 and the input shaft 40. The second gear assembly includes an input gear 45 located behind the drive gear 42 and disposed on the input shaft 40, with the input gear 45 integrally formed with the input shaft 40. The sliding engagement sleeve 44 is located between the drive gear 42 and the input gear 45 and can mesh with the drive gear 42 and / or the input gear 45 axially on the input shaft 40 via a spline. Specifically, when the vehicle needs to be adjusted to a high gear, the sliding engagement sleeve 44 meshes with the drive gear 42, causing the drive gear 42 to move synchronously with the input shaft 40, thus achieving high-speed gear adjustment; when the vehicle needs to be adjusted to a low gear, the sliding engagement sleeve 44 meshes with the input gear 45, causing the input gear 45 to move synchronously with the input shaft 40, thus achieving low-speed gear adjustment; when the vehicle is in neutral (e.g., ... Figure 2 (As shown in the diagram), the input shaft 40 is idling. To simplify the structure, in this embodiment, the sliding engagement sleeve 44 is slidably connected to the drive gear 42 along the axial direction of the input shaft 40 via a spline, and its outer peripheral wall is recessed with an annular groove. The groove engages with the synchronizer's shift fork 46, so that the sliding engagement sleeve 44 slides along the axial direction of the input shaft 40 under the drive of the shift fork 46 to engage or disengage with the input gear 45.

[0026] The differential 5 is located in the inner cavity of the axle housing 1 and its left and right ends are respectively connected to the two half shafts 2. The differential 5 includes a disc tooth (not shown) that meshes with the driven gear 431. The disc tooth rotates under the drive of the driven gear 431.

[0027] To improve the heat dissipation of the drive motor 3, a rear cover 11 is located on the rear side of the axle housing 1. Specifically, the rear cover 11 is located between the rear side of the axle housing 1 and the drive motor 3. A front flange 111 and a rear flange 112 are formed on the front and rear sides of the rear cover 11, respectively. The front flange 111 is fixedly connected to the rear side wall of the axle housing 1 by screws, and the rear flange 112 is fixedly connected to the front side wall of the drive motor 3 by bolts. To further improve the heat dissipation of the drive motor 3, multiple upper heat sinks 113 are formed by protruding outward from the outer surface of the rear cover 11 between the front flange 111 and the rear flange 112. Each upper heat sink 113 extends downward and has a lower extension 114 located below the rear flange 112. Each lower extension 114 extends rearward along the axial direction of the input shaft 40 to form a lower heat sink 115. The multiple lower heat sinks 115 are located below the drive motor 3 and in contact with the drive motor 3 to facilitate heat dissipation. By setting multiple upper heat sinks 113 and multiple lower heat sinks 115, the heat dissipation effect is optimized.

[0028] To simplify the structure, facilitate processing and installation, and improve structural strength, in this embodiment, the front flange 111, rear flange 112, multiple upper heat sinks 113, multiple lower heat sinks 115, and rear cover 11 are integrally formed. The multiple upper heat sinks 113 extend axially along the input shaft 40 and are distributed radially along the input shaft 40. The rear cover 11 also includes a support plate 116, which is fixedly connected to the top surface of the multiple lower heat sinks 115. The top surface of the support plate 116 is adapted to the shape of the lower surface of the drive motor 3 and contacts the lower surface of the drive motor 3. By setting the support plate 116, the contact area between the multiple lower heat sinks 115 and the drive motor 3 can be increased, thereby strengthening the structure.

[0029] In order to make reasonable use of power, a power take-off pump 6 is provided. Specifically, a power take-off pump 6 is connected to the front side of the reducer 4 corresponding to the front side of the output shaft 43. The power take-off pump 6 is fixedly connected to the reducer housing by bolts. The input end 61 of the power take-off pump 6 extends into the inner cavity of the reducer housing 41 and is connected to the output shaft 43 by splines.

[0030] The electric drive axle assembly of this utility model connects the drive motor and the reducer to the rear and front sides of the axle housing, respectively. On the one hand, it can reduce the radial dimension of the electric drive axle, thereby reducing the volume and making the structure compact, and the drive motor has a large efficient working range. On the other hand, it is not only convenient to install, but also the electric drive axle has a balanced front and rear weight distribution, that is, a balanced force, which can improve the vehicle's power and balance.

[0031] The above embodiments are only used to illustrate the technical solutions of this utility model, and are not intended to limit it. Although this utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the foregoing embodiments, or make equivalent substitutions for some of the technical features. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of this utility model.

Claims

1. An electric drive axle assembly, characterized in that, It includes the axle housing, two half-shafts, drive motor, reducer, and differential. The two half-shafts are rotatably connected to the inner cavity of the bridge housing; The drive motor is connected to the rear side of the bridge housing; The reducer is connected to the front side of the axle housing and includes a reducer housing fixedly connected to the front side of the axle housing, a drive gear and an output shaft rotatably connected to the inner cavity of the reducer housing via bearings. The rear end of the drive gear is rotatably connected to an input shaft via bearings. The input shaft passes rearward through the axle housing and is connected to the output end of the drive motor. The front end and rear end of the output shaft are respectively provided with a driven gear and a bevel gear. The driven gear meshes with the drive gear. The differential is located in the inner cavity of the axle housing and its two ends are respectively connected to the two half shafts. The differential includes disc teeth that mesh with the driven gear.

2. The electric drive axle assembly as described in claim 1, characterized in that, The drive motor is fixedly connected to the rear side wall of the axle housing and the two are perpendicular to each other.

3. The electric drive axle assembly as described in claim 1, characterized in that, The device includes a rear cover located between the rear side of the axle housing and the drive motor. A front flange and a rear flange are formed on the front and rear sides of the rear cover, respectively. The front flange is fixedly connected to the rear side wall of the axle housing, and the rear flange is fixedly connected to the front side wall of the drive motor.

4. The electric drive axle assembly as described in claim 3, characterized in that, The outer surface of the rear cover protrudes outward to form a plurality of upper heat sinks located between the front flange and the rear flange. Each upper heat sink extends downward and has a lower extension located below the rear flange. Each lower extension extends rearward along the axial direction of the input shaft to form a lower heat sink. The plurality of lower heat sinks are located below the drive motor and in contact with the motor.

5. The electric drive axle assembly as described in claim 4, characterized in that, The plurality of upper heat sinks extend along the axial direction of the input shaft and are distributed radially along the input shaft. The rear cover also includes a support plate, which is fixedly connected to the top surface of the plurality of lower heat sinks. The top surface of the support plate is adapted to the shape of the lower surface of the drive motor and is in contact with the lower surface of the drive motor. The front flange, the rear flange, the plurality of upper heat sinks, the plurality of lower heat sinks and the rear cover are integrally formed.

6. The electric drive axle assembly as described in claim 1, characterized in that, The reducer includes a first gear assembly, a second gear assembly, and a sliding engagement sleeve disposed within the inner cavity of the reducer housing. The first gear assembly includes the driving gear and the input shaft. The second gear assembly includes an input gear located behind the driving gear and disposed on the input shaft. The sliding engagement sleeve is located between the driving gear and the input gear and can mesh with the driving gear and / or the input gear axially via a spline on the input shaft.

7. The electric drive axle assembly as described in claim 6, characterized in that, The input gear is integrally formed with the input shaft. The sliding engagement sleeve is slidably connected to the drive gear in the axial direction of the input shaft via a spline, and its outer peripheral wall is recessed with an annular groove. The groove engages with the synchronizer's shift fork to drive the sliding engagement sleeve to slide in the axial direction of the input shaft to engage or disengage with the input gear.

8. The electric drive axle assembly as described in claim 1, characterized in that, The input shaft is located above and perpendicular to the half shaft, and the output shaft is located below and parallel to the input shaft. A power take-off pump is connected to the front side wall of the reducer corresponding to the front side of the output shaft. The input end of the power take-off pump extends into the inner cavity of the reducer housing and is connected to the output shaft via a spline. A controller is integrated below the drive motor.

Images