Electric drive axle assembly structure

Abstract

The utility model discloses an electric drive axle assembly structure which comprises a motor, two half shafts, an intermediate shaft, a gear structure arranged on the intermediate shaft, a differential mechanism and a speed reducer, and is characterized in that the intermediate shaft is provided with a transmission gear; the gear structure comprises a first output gear, a second output gear and a gear shifting assembly, wherein the first output gear and the second output gear are arranged on the intermediate shaft, and the gear shifting assembly is located between the first output gear and the second output gear. The differential mechanism is connected between the two half shafts and comprises a shell rotationally connected with the two half shafts and a planetary gear assembly arranged in the shell, and a first driven gear meshed with the first output gear and a second driven gear meshed with the second output gear are fixed to the peripheral wall of the shell. The first driven gear and the second driven gear can be integrated on the shell, so that the installation space is saved, the structure is compact, model selection and assembly of a supporting bearing of the differential mechanism are facilitated, and the machining and manufacturing cost is effectively reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of automobile accessories, in particular to an electric drive axle assembly structure. Background Art

[0002] The existing electric drive axle includes a motor, two half shafts, an intermediate shaft connected to the motor, a gear control assembly, a driven gear assembly, a differential and a reducer, wherein the intermediate shaft is located between the motor and the half shaft and is parallel to the half shaft, the gear control assembly is arranged on the intermediate shaft and has a driving gear assembly arranged on the intermediate shaft, the driving gear assembly includes a first driving gear, a second driving gear and a clutch arranged between the first driving gear and the second driving gear, the driven gear assembly is arranged on the same half shaft and includes a first driven gear meshed with the first driving gear and a second driven gear meshed with the second driving gear, the first driven gear and the second driven gear are sleeved on the same half shaft and both are fixed, the differential and the reducer are respectively located on opposite sides of the driven gear assembly, the differential is connected between the two half shafts and is fixedly connected to the first driven gear. However, the above structure is not compact enough, resulting in a large installation space. Utility Model Content

[0003] In view of the deficiencies in the prior art, the purpose of the utility model is to provide an electric drive axle assembly structure, which saves installation space by integrating the first driven gear and the second driven gear on the housing of the differential to make the structure compact and easy to install.

[0004] To achieve the above purpose, the embodiment of the utility model adopts the following technical solutions:

[0005] The electric drive axle assembly structure includes a motor, two half shafts, an intermediate shaft, a gear structure arranged on the intermediate shaft, a differential and a reducer;

[0006] The intermediate shaft is located between the motor and the half shaft, is connected to the motor and is parallel to the half shaft, and is provided with a transmission gear;

[0007] The gear structure is located on one side of the transmission gear, and includes a first output gear, a second output gear and a shift assembly located between the first output gear and the second output gear, and the shift assembly can be selectively connected to or separated from the first output gear and the second output gear;

[0008] The differential is connected between the two half shafts, and includes a housing rotatably connected to the two half shafts and a planetary gear assembly disposed in the housing and connected to the two half shafts, wherein a first driven gear meshing with the first output gear and a second driven gear meshing with the second output gear are fixed to the outer peripheral wall of the housing;

[0009] The speed reducer is connected to the half shaft, is located at one side of the differential and is connected to the differential.

[0010] Furthermore, the housing has two connecting ends and a fixing portion located between the two connecting ends, the two connecting ends are respectively matched with the two half shafts, and the first driven gear and the second driven gear are respectively fixed to the two end surfaces of the fixing portion.

[0011] Furthermore, the shell includes two half shells, each of the half shells has a connecting end that cooperates with the half shaft and a fixed end opposite to the connecting end, the two fixed ends are butt-connected to form a fixed part, and the two end surfaces of the fixed part are respectively fixed with a first driven gear and a second driven gear.

[0012] Furthermore, the fixing portion is provided with a plurality of through holes surrounding the outer side of the half-shaft along the axial direction of the half-shaft, and the first driven gear and the second driven gear are respectively provided with a fixing hole along the axial direction of the half-shaft and corresponding to each of the through holes, and each of the through holes is provided with a bolt for connecting the first driven gear and the second driven gear, and both ends of the bolt are respectively matched with the two corresponding fixing holes.

[0013] Furthermore, the reducer includes a reduction planetary wheel carrier and a reduction gear assembly arranged in the reduction planetary wheel carrier and connected to the half-shaft. The reduction planetary wheel carrier is fixed to the housing by bolts, and the free end of the reduction planetary wheel carrier is rotatably matched with a corresponding half-shaft.

[0014] Furthermore, the first output gear is away from the transmission gear relative to the second output gear, the motor is connected to an input shaft parallel to the half-shaft, the input shaft is provided with an input driving gear, the transmission gear is meshed with the input driving gear, the two half-shafts are of equal length and are symmetrical about a symmetry center line, and the motor, the gear structure and the differential are located on the symmetry center line.

[0015] Furthermore, the ring gear of the reducer is fixedly connected to the housing.

[0016] Furthermore, the intermediate shaft is also provided with an intermediate clutch and a driving gear, the intermediate clutch is located on the other side of the transmission gear, the driving gear is connected to or separated from the intermediate clutch and is located on the side of the intermediate clutch away from the transmission gear, the half shaft is also provided with a third output gear meshing with the driving gear and located on the outside of the reducer, the sun gear of the reducer is fixedly connected to the third output gear or the two are integrally formed.

[0017] Furthermore, the shell is rotatably connected to a first power take-off gear located on the side of the second driven gear away from the first driven gear, and the first power take-off gear is meshed with the transmission gear. The electric drive axle assembly structure also includes a power take-off shaft located on the side of the first power take-off gear away from the transmission gear, and a second power take-off gear and a power take-off clutch arranged on the power take-off shaft, the second power take-off gear is meshed with the first power take-off gear, and the power take-off clutch is located on one side of the second power take-off gear and the two are connected or separated.

[0018] Furthermore, one end of the half shaft is fitted into the connecting end of the housing and is connected to the planetary gear assembly via a spline, and the shift assembly is a shift clutch.

[0019] The electric drive axle assembly structure of the utility model can integrate the first driven gear and the second driven gear on the housing by fixing the first driven gear meshing with the first output gear and the second driven gear meshing with the second output gear at both ends of the housing, thereby saving installation space to make the structure compact, and facilitating the selection and assembly of the support bearing of the differential, effectively reducing the processing and manufacturing costs. The electric drive axle assembly structure of the utility model has the characteristics of few parts, compact structure, light weight and small size, and can meet the chassis space requirements for arranging leaf springs and air suspensions. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 A cross-sectional view of a differential of an electric drive axle assembly structure according to an embodiment of the utility model;

[0021] Figure 2 It is a schematic diagram of the electric drive axle assembly structure of an embodiment of the utility model;

[0022] Figure 3 for Figure 2 A schematic diagram of another embodiment. DETAILED DESCRIPTION

[0023] Below, in conjunction with the accompanying drawings and specific implementation methods, the utility model is further described:

[0024] like Figures 1 to 3 As shown, the embodiment of the utility model provides an electric drive axle assembly structure, which is applied to heavy vehicles, and in this embodiment, is applied to trucks. The electric drive axle assembly structure includes a motor 1, two half shafts 2, an intermediate shaft 3, a gear structure 4 arranged on the intermediate shaft 3, a differential 5, and a reducer 6.

[0025] The motor 1 is connected to an input shaft 11 parallel to the half shaft 2, and the input shaft 11 is provided with an input driving gear 12, and the input driving gear 12 rotates synchronously with the input shaft 11. The two half shafts 2 are located behind the motor 1, wherein the two half shafts 2 are equal in length and symmetrical about a symmetry center line (not shown), and the motor 1, the gear structure 4 and the differential 5 are located on the symmetry center line, so that the electric drive axle assembly has a compact structure.

[0026] The intermediate shaft 3 is located between the motor 1 and the half shaft 2, connected to the motor 1 and parallel to the half shaft 2. The intermediate shaft 3 is fixed with a transmission gear 31, which meshes with the input driving gear 12 to rotate under the drive of the input driving gear 12. The intermediate shaft 3 is also provided with an intermediate clutch 32 and a driving gear 33. The intermediate clutch 32 is located on the other side (right side) of the transmission gear 31. The driving gear 33 is rotatably connected to the intermediate shaft 3 and is located on the side (right side) of the intermediate clutch 32 away from the transmission gear 31. The driving gear 33 can be connected to or separated from the intermediate clutch 32. Specifically, when the driving gear 33 is connected to the intermediate clutch 32, speed change is achieved, and when the driving gear 33 is separated from the intermediate clutch 32, neutral gear is achieved. By arranging the intermediate clutch 32 on the intermediate shaft 3, the design, processing and cost of the clutch can be reduced, and the service life of the clutch can be extended.

[0027] The gear structure 4 is located on one side (left side) of the transmission gear 31, and includes a first output gear 41, a second output gear 42, and a shift assembly 43 located between the first output gear 41 and the second output gear 42. The shift assembly 43 can be selectively connected to or separated from the first output gear 41 and the second output gear 42 to achieve gear shifting.

[0028] The differential 5 is connected between the two half shafts 2, and includes a housing 51 rotatably connected to the two half shafts 2 and a planetary gear assembly 52 disposed in the housing 51 and connected to the two half shafts 2. The outer peripheral wall of the housing 51 is fixed with a first driven gear 53 meshing with the first output gear 41 and a second driven gear 54 meshing with the second output gear 42. That is, the first driven gear 53 and the second driven gear 54 are integrated on the housing 51, which can save installation space to make the structure compact, and facilitate the selection and assembly of the supporting bearing of the differential 5, effectively reduce the processing and manufacturing costs, so that the electric drive axle assembly structure has the characteristics of few parts, compact structure, light weight and small volume, and can meet the chassis space requirements for arranging leaf springs and air suspensions. In this embodiment, one end of the half shaft 2 is matched in the connecting end 511 of the housing 51 and is connected to the planetary gear assembly 52 through a spline, and the shift assembly 43 is a shift clutch; the first output gear 41 is away from the transmission gear 31 relative to the second output gear 42, that is, the first output gear 41 is located on the left side of the second output gear 42.

[0029] Specifically, the housing 51 has two connecting ends 511 and a fixing portion 512 located between the two connecting ends 511. The two connecting ends 511 are respectively rotatably matched with the two half shafts 2. The two end surfaces of the fixing portion 512 are respectively fixed with a first driven gear 53 and a second driven gear 54. More specifically, the housing 51 includes two half shells 510. Each half shell 510 has a connecting end 511 rotatably matched with the half shaft 2 and a fixing end 5101 opposite to the connecting end 511. The two fixing ends 5101 are butt-connected to form the fixing portion 512. The two end surfaces of the fixing portion 512 are respectively fixed with a first driven gear 53 and a second driven gear 54. In this embodiment, the fixing portion 512 is provided with a plurality of through holes 5121 surrounding the outer side of the half shaft 2 along the axial direction of the half shaft 2. The first driven gear 53 and the second driven gear 54 are respectively provided with a fixing hole 55 along the axial direction of the half shaft 2 and corresponding to each through hole 5121. Each through hole 5121 is provided with a bolt 7 for connecting the first driven gear 53 and the second driven gear 54. The two ends of the bolt 7 are respectively matched with the two corresponding fixing holes 55, so that the housing 51 and the first driven gear 53 and the second driven gear 54 form a whole.

[0030] The reducer 6 is connected to the half shaft 2, which is located on one side (right side) of the differential 5 and connected to the differential 5. The reducer 6 includes a reduction planetary wheel carrier 61 and a reduction gear assembly 62 arranged in the reduction planetary wheel carrier 61 and connected to the half shaft 2. The reduction planetary wheel carrier 61 is fixed to the housing 51 by bolts, and the free end of the reduction planetary wheel carrier 61 and the corresponding half shaft 2 are rotatably matched, so that the reduction planetary wheel carrier 61 and the housing 51, the first driven gear 53 and the second driven gear 54 form a whole, that is, the four are integrated into one, which further makes the structure compact. In this embodiment, the half shaft 2 is also provided with a third output gear 21 meshing with the driving gear 33 and located outside the reducer 6. Specifically, the sun gear 64 of the reducer 6 is fixedly connected to the third output gear 21 by bolts or the two are integrally formed. In order to facilitate manufacturing and assembly, the ring gear 63 of the reducer 6 is fixedly connected to the housing 51.

[0031] When the shift clutch is connected to the first output gear 41, a first gear shift is achieved, and when the shift clutch is separated from the first output gear 41, a neutral gear is achieved; when the shift clutch is connected to the second output gear 42, a second gear shift is achieved, and when the shift clutch is separated from the second output gear 42, a neutral gear is achieved; when the shift clutch is separated from the first output gear 41 and the second output gear 42, when the intermediate clutch 32 is connected to the driving gear 33, a third gear shift is achieved, and when the intermediate clutch 32 is separated from the driving gear 33, a neutral gear is achieved.

[0032] In another embodiment, the reducer 6 is eliminated, and the housing 51 is rotatably connected to a first power take-off gear 8 located on the side of the second driven gear 54 away from the first driven gear 53 (i.e., the right side of the second driven gear 54), and the first power take-off gear 8 is meshed with the transmission gear 31. The electric drive axle assembly structure also includes a power take-off shaft 9 located on the side of the first power take-off gear 8 away from the transmission gear 31 (i.e., the rear side of the first power take-off gear 8) and a second power take-off gear 91 and a power take-off clutch 92 provided on the power take-off shaft 9. The second power take-off gear 91 is meshed with the first power take-off gear 8, and the power take-off clutch 92 is used to connect the power take-off device. Specifically, the power take-off clutch 92 is located on one side of the second power take-off gear 91 and the two are connected or separated. When the power take-off device takes power, the power take-off clutch 92 is connected to the second power take-off gear 91, and when the power take-off device does not take power, the power take-off clutch 92 is separated from the second power take-off gear 91, that is, the power take-off device can choose to take power or not according to actual needs.

[0033] The electric drive axle assembly structure of the utility model can integrate the first driven gear and the second driven gear on the housing by fixing the first driven gear meshing with the first output gear and the second driven gear meshing with the second output gear at both ends of the housing, thereby saving installation space to make the structure compact, and facilitating the selection and assembly of the support bearing of the differential, effectively reducing the processing and manufacturing costs. The electric drive axle assembly structure of the utility model has the characteristics of few parts, compact structure, light weight and small size, and can meet the chassis space requirements for arranging leaf springs and air suspensions.

[0034] The above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein, and these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the various embodiments of the present invention.

Claims

1. The electric drive axle assembly structure is characterized by: It includes a motor, two half shafts, an intermediate shaft, a gear structure arranged on the intermediate shaft, a differential and a reducer; The intermediate shaft is located between the motor and the half shaft, is connected to the motor and is parallel to the half shaft, and is provided with a transmission gear; The gear structure is located on one side of the transmission gear, and includes a first output gear, a second output gear and a shift assembly located between the first output gear and the second output gear, and the shift assembly can be selectively connected to or separated from the first output gear and the second output gear; The differential is connected between the two half shafts, and includes a housing rotatably connected to the two half shafts and a planetary gear assembly disposed in the housing and connected to the two half shafts, wherein a first driven gear meshing with the first output gear and a second driven gear meshing with the second output gear are fixed to the outer peripheral wall of the housing; The speed reducer is connected to the half shaft, is located at one side of the differential and is connected to the differential.

2. The electric drive axle assembly structure according to claim 1, characterized in that: The housing has two connecting ends and a fixing portion located between the two connecting ends. The two connecting ends are respectively matched with the two half shafts. The two end surfaces of the fixing portion are respectively fixed with a first driven gear and a second driven gear.

3. The electric drive axle assembly structure according to claim 1, characterized in that: The shell includes two half shells, each of which has a connecting end that cooperates with the half shaft and a fixed end opposite to the connecting end. The two fixed ends are butt-connected to form a fixed part, and the two end surfaces of the fixed part are respectively fixed with a first driven gear and a second driven gear.

4. The electric drive axle assembly structure as claimed in claim 3, characterized in that: The fixing portion is provided with a plurality of through holes surrounding the outer side of the half shaft along the axial direction of the half shaft, and the first driven gear and the second driven gear are respectively provided with a fixing hole along the axial direction of the half shaft and corresponding to each of the through holes, and each of the through holes is provided with a bolt for connecting the first driven gear and the second driven gear, and both ends of the bolt are respectively matched with the two fixing holes corresponding thereto.

5. The electric drive axle assembly structure according to claim 1, characterized in that: The reducer includes a reduction planetary wheel carrier and a reduction gear assembly arranged in the reduction planetary wheel carrier and connected to the half-shaft. The reduction planetary wheel carrier is fixed to the housing by bolts, and the free end of the reduction planetary wheel carrier is rotatably matched with a corresponding half-shaft.

6. The electric drive axle assembly structure according to claim 1, characterized in that: The first output gear is away from the transmission gear relative to the second output gear, the motor is connected to an input shaft parallel to the half-shaft, the input shaft is provided with an input driving gear, the transmission gear is meshed with the input driving gear, the two half-shafts are of equal length and are symmetrical about a symmetry center line, and the motor, the gear structure and the differential are located on the symmetry center line.

7. The electric drive axle assembly structure according to claim 1, characterized in that: The gear ring of the reducer is fixedly connected to the housing.

8. The electric drive axle assembly structure according to claim 1, characterized in that: The intermediate shaft is also provided with an intermediate clutch and a driving gear, the intermediate clutch is located on the other side of the transmission gear, the driving gear is connected to or separated from the intermediate clutch and is located on the side of the intermediate clutch away from the transmission gear, the half shaft is also provided with a third output gear meshing with the driving gear and located on the outside of the reducer, the sun gear of the reducer is fixedly connected to the third output gear or the two are integrally formed.

9. The electric drive axle assembly structure according to claim 1, characterized in that: The shell is rotatably connected to a first power take-off gear located on a side of the second driven gear away from the first driven gear, and the first power take-off gear is meshed with the transmission gear. The electric drive axle assembly structure also includes a power take-off shaft located on a side of the first power take-off gear away from the transmission gear, and a second power take-off gear and a power take-off clutch arranged on the power take-off shaft, the second power take-off gear is meshed with the first power take-off gear, and the power take-off clutch is located on one side of the second power take-off gear and the two are connected or separated.

10. The electric drive axle assembly structure according to claim 1, characterized in that: One end of the half shaft is fitted into the connecting end of the housing and is connected to the planetary gear assembly through a spline, and the shift assembly is a shift clutch.

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