Dual-motor heavy truck electric drive axle and electric truck

Abstract

The utility model provides a dual-motor heavy truck electric drive axle and an electric truck, and relates to the technical field of electric drive axles, the dual-motor heavy truck electric drive axle comprises two drive motors, two groups of speed reducer assemblies and a differential mechanism assembly, the two drive motors and the two groups of speed reducer assemblies are matched to form two motor speed reducer groups; any speed reducer assembly comprises a motor input shaft and an intermediate shaft, and the motor input shaft and the intermediate shaft are in transmission connection through a two-gear gear structure; any driving motor is in transmission connection with the corresponding motor input shaft through a spline. Intermediate shafts of the two speed reducer assemblies are in transmission connection with the differential mechanism assembly through gear structures. Through the structural design of the double-motor two-gear driving electric drive axle, the electric drive axle has multiple driving modes, can be suitable for different working conditions of a heavy truck, improves the flexibility of the drive axle, and is symmetrical and compact in structure and small in occupied space.

Description

Technical Field

[0001] This utility model relates to the field of electric drive axle technology, specifically to a dual-motor heavy-duty truck electric drive axle and an electric truck. Background Technology

[0002] For electric drive axles in electric trucks, such as those used in medium and heavy-duty electric trucks, the current mature solution on the market is to use a fixed-ratio reducer. In this case, the driving torque is small at low motor speeds, which cannot meet the climbing requirements of heavy trucks, resulting in low overall vehicle power. At high speeds, in order to balance power performance, the motor cannot operate in the economic zone, thus increasing power consumption and resulting in poor overall vehicle economy. This significantly reduces the transportation efficiency of electric trucks, reduces their driving range, increases the operating costs of electric trucks, and is not conducive to market promotion.

[0003] Furthermore, in electric drive axles with differentials, the space occupied by the differential is relatively large, thus limiting the space available for the reducer and motor. Therefore, a reducer with better space utilization is required. Numerous electric drive axle designs for passenger cars are known in this regard; however, passenger car electric drive axles differ significantly from those for electric trucks in many aspects, making it virtually impossible to directly adapt passenger car electric drive axles for electric trucks.

[0004] A Chinese patent application with publication number CN109466297B discloses a differential assembly comprising an axle housing, a bevel gear differential assembly, a left half-shaft, and a right half-shaft. A left wheel is connected to one end of the left half-shaft, and the other end of the left half-shaft is fixedly connected to the left half-shaft gear in the bevel gear differential assembly. A right wheel is connected to one end of the right half-shaft, and the other end of the right half-shaft is fixedly connected to the right half-shaft gear in the bevel gear differential assembly. The invention is characterized in that a first drive motor is connected to the left housing of the bevel gear differential assembly via a first AMT assembly, and a second drive motor is connected to the right housing of the bevel gear differential assembly via a second AMT assembly; the first drive motor and the second drive motor have the same power.

[0005] The existing dual-motor drive axle structure is complex and occupies a large space, and there are areas for improvement. Utility Model Content

[0006] In view of the deficiencies in the existing technology, the purpose of this utility model is to provide a dual-motor heavy-duty truck electric drive axle and an electric truck.

[0007] The present invention provides a dual-motor heavy-duty truck electric drive axle, comprising two drive motors, two reducer assemblies, and a differential assembly. The two drive motors and the two reducer assemblies cooperate to form two motor-reducer groups. Each reducer assembly includes a motor input shaft and an intermediate shaft, which are connected by a two-speed gear structure. Each drive motor is connected to its corresponding motor input shaft via a spline. The intermediate shafts of both reducer assemblies are connected to the differential assembly via gear structures.

[0008] Preferably, a first-gear drive gear and a second-gear drive gear are fixedly mounted on the motor input shaft, and a first-gear drive gear and a second-gear drive gear are mounted on the intermediate shaft. The first-gear drive gear meshes with the first-gear drive gear, and the second-gear drive gear meshes with the second-gear drive gear. A sliding sleeve is also mounted on the intermediate shaft, which drives the first-gear drive gear to the intermediate shaft, or the sliding sleeve drives the second-gear drive gear to the intermediate shaft.

[0009] Preferably, a main reducer drive gear is fixedly installed on the intermediate shaft of each of the two reducer assemblies, and a main reducer driven gear is installed on the differential assembly; the two main reducer drive gears mesh with the main reducer driven gear respectively.

[0010] Preferably, the differential assembly includes an output half-shaft, a differential, a differential lock, a sun gear, a locking ring gear, and a planetary carrier; the sun gear is coaxially and fixedly connected to the main reduction driven gear, the sun gear meshes with the planet gears, the planet gears mesh with the locking ring gear, the planet gears are connected to the planetary carrier, the planetary carrier is mounted on the differential, and two output half-shafts with opposite extension directions are respectively connected to the half-shaft gears of the differential, and the differential lock is mounted on one of the output half-shafts.

[0011] Preferably, the two motor reducer groups are axially symmetrical with the output half-shaft as the center of symmetry.

[0012] Preferably, the two drive motors can output simultaneously or output individually.

[0013] Preferably, the two drive motors, two sets of reducer assemblies, and one differential assembly are arranged in the same housing.

[0014] Preferably, the motor input shaft, intermediate shaft, and output half-shaft are arranged in parallel.

[0015] According to the present invention, an electric truck has an electric drive axle.

[0016] Compared with the prior art, the present invention has the following beneficial effects:

[0017] 1. This utility model features a dual-motor, two-speed electric drive axle structure design, which has multiple driving modes, can be adapted to different working conditions of heavy trucks, improves the flexibility of the drive axle, and has a symmetrical and compact structure that occupies little space. Attached Figure Description

[0018] Other features, objects, and advantages of this invention will become more apparent from the following detailed description of non-limiting embodiments with reference to the accompanying drawings:

[0019] Figure 1 This is a schematic diagram illustrating the overall structure of the electric drive axle, which is the main feature of this utility model.

[0020] Figure 2 This is a schematic diagram of the differential assembly, which is the main feature of this utility model.

[0021] Figure label:

[0022] Drive motor 1, second gear driven gear 6

[0023] Motor input shaft 2, output half shaft 7

[0024] First gear drive gear 201, main reduction driven gear 13

[0025] Second gear drive gear 202 Differential assembly 14

[0026] Intermediate Shaft 3, Differential 1401

[0027] Main reduction drive gear 301, differential lock 1402

[0028] First gear driven gear 4, sun gear 1403

[0029] Slip sleeve 5 Locking gear ring 1404

[0030] Planetary Carrier 1405 Detailed Implementation

[0031] The present invention will now be described in detail with reference to specific embodiments. These embodiments will help those skilled in the art to further understand the present invention, but do not limit the present invention in any way. It should be noted that those skilled in the art can make several changes and improvements without departing from the concept of the present invention. These all fall within the protection scope of the present invention.

[0032] like Figure 1 As shown, the present invention provides a dual-motor heavy-duty truck electric drive axle and an electric truck, comprising two drive motors 1, two sets of reducer assemblies, and a differential assembly 14. The two drive motors 1 and the two sets of reducer assemblies cooperate to form two motor reducer groups. The two motor reducer groups have the same structure.

[0033] Each reducer assembly includes a motor input shaft 11 and an intermediate shaft 21. The motor input shaft 11 and the intermediate shaft 21 are connected by a two-speed gear transmission structure. Each drive motor 11 is connected to the corresponding motor input shaft 2 via a spline. The intermediate shaft 3 of both reducer assemblies is connected to the differential assembly 14 via a gear structure.

[0034] Specifically, the technical solution of this application can realize dual-motor two-speed drive, with multiple drive modes and strong applicability. The two drive motors 1, two sets of reducer assemblies and a differential assembly 14 are arranged in the same housing, and the two motor reducer assemblies are axially symmetrical about the output half-shaft 7, which is compact and occupies little space.

[0035] More specifically, the technical solution of this application is illustrated using a set of motor reducers as an example:

[0036] A first-speed drive gear 201 and a second-speed drive gear 202 are fixedly installed on the motor input shaft 2. The first-speed drive gear 201 is located on one side of the principle drive motor 1 relative to the second-speed drive gear 202. A first-speed driven gear 4 and a second-speed driven gear 6 are arranged on the intermediate shaft 3. The first-speed drive gear 201 meshes with the first-speed driven gear 4, and the second-speed drive gear 202 meshes with the second-speed driven gear 6.

[0037] A sliding sleeve 5 is also provided on the intermediate shaft 3. The sliding sleeve 5 drives the first driven gear 4 to the intermediate shaft 3, or drives the second driven gear 6 to the intermediate shaft 3. It should be noted that the sliding sleeve 5 can also be in the unloaded position, in which case the drive connection between the intermediate shaft 3 and the motor input shaft 2 is disconnected.

[0038] Furthermore, a main reducer drive gear 301 is fixedly mounted on the intermediate shaft 3 of both reducer assemblies, and a main reducer driven gear 13 is mounted on the differential assembly 14. The two main reducer drive gears 301 mesh with the main reducer driven gear 13 respectively. This enables the two reducer assemblies to be connected to the differential assembly 14 for transmission.

[0039] like Figure 1 and Figure 2 As shown, the differential assembly 14 includes output half-shafts 7, a differential 1401, a differential lock 1402, a sun gear 1403, a locking ring gear 1404, and a planet carrier 1405. The sun gear 1403 is coaxially and fixedly connected to the main reduction driven gear 13. The sun gear 1403 meshes with planet gears, which mesh with the locking ring gear 1404. The planet gears are connected to the planet carrier 1405, which is mounted on the differential 1401. Two output half-shafts 7 extending in opposite directions are connected to the half-shaft gears of the differential 1401. The differential lock 1402 is mounted on one of the output half-shafts 7. The other output half-shaft 7 passes between the two reduction gear assemblies.

[0040] It should be noted that the two drive motors 1 of this application can output simultaneously or individually. The electric drive axle of this application has multiple drive modes, which can be applied to different working conditions of heavy trucks and improve the flexibility of the drive axle.

[0041] It should be further explained that the motor input shaft 2, intermediate shaft 3 and output half shaft 7 are arranged in parallel, which further improves the overall compactness of the electric drive axle.

[0042] This utility model also provides an electric truck having an electric drive axle.

[0043] In the description of this application, it should be understood that the terms "upper", "lower", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this application.

[0044] The specific embodiments of this utility model have been described above. It should be understood that this utility model is not limited to the specific embodiments described above, and those skilled in the art can make various changes or modifications within the scope of the claims, which do not affect the substantive content of this utility model. Unless otherwise specified, the embodiments and features described in this application can be arbitrarily combined with each other.

Claims

1. A dual-motor heavy-duty truck electric drive axle, characterized in that, It includes two drive motors (1), two sets of reducer assemblies and a differential assembly (14). The two drive motors (1) and the two sets of reducer assemblies work together to form two motor reducer groups. Each of the aforementioned reducer assemblies includes a motor input shaft (2) and an intermediate shaft (3), which are connected by a two-speed gear structure. Each of the aforementioned drive motors (1) is connected to the corresponding motor input shaft (2) via a spline; The intermediate shafts (3) of both reducer assemblies are connected to the differential assembly (14) via a gear structure.

2. The dual-motor heavy-duty truck electric drive axle as described in claim 1, characterized in that, A first-speed drive gear (201) and a second-speed drive gear (202) are fixedly installed on the motor input shaft (2). A first-speed driven gear (4) and a second-speed driven gear (6) are configured on the intermediate shaft (3). The first-speed drive gear (201) meshes with the first-speed driven gear (4), and the second-speed drive gear (202) meshes with the second-speed driven gear (6). The intermediate shaft (3) is also equipped with a sliding sleeve (5), which drives the first-gear driven gear (4) to the intermediate shaft (3), or the sliding sleeve (5) drives the second-gear driven gear (6) to the intermediate shaft (3).

3. The dual-motor heavy-duty truck electric drive axle as described in claim 1, characterized in that, Both sets of reducer assemblies are fixedly provided with a main reducer drive gear (301) on the intermediate shaft (3), and the differential assembly (14) is provided with a main reducer driven gear (13); The two main reducing drive gears (301) mesh with the main reducing driven gears (13) respectively.

4. The dual-motor heavy-duty truck electric drive axle as described in claim 3, characterized in that, The differential assembly (14) includes an output half shaft (7), a differential (1401), a differential lock (1402), a sun gear (1403), a locking ring gear (1404), and a planet carrier (1405); The sun gear (1403) is coaxially and fixedly connected to the main reduction driven gear (13). The sun gear (1403) meshes with the planet gears. The planet gears mesh with the locking ring gear (1404). The planet gears are connected to the planet carrier (1405). The planet carrier (1405) is mounted on the differential (1401). Two output half-shafts (7) with opposite extension directions are respectively connected to the half-shaft gears of the differential (1401). The differential lock (1402) is mounted on one of its output half-shafts (7).

5. The dual-motor heavy-duty truck electric drive axle as described in claim 3, characterized in that, The two motor reducer groups are axially symmetrical with the output half-shaft (7) as the center of symmetry.

6. The dual-motor heavy-duty truck electric drive axle as described in claim 1, characterized in that, The two drive motors (1) can output simultaneously or output individually.

7. The dual-motor heavy-duty truck electric drive axle as described in claim 1, characterized in that, The two drive motors (1), two sets of reducer assemblies and a differential assembly (14) are arranged in the same housing.

8. The dual-motor heavy-duty truck electric drive axle as described in claim 4, characterized in that, The motor input shaft (2), intermediate shaft (3) and output half shaft (7) are arranged in parallel.

9. An electric truck, characterized in that, The electric truck has an electric drive axle as described in any one of claims 1 to 8.

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