WO2018121515A1

WO2018121515A1 - Electric drive axle

Info

Publication number: WO2018121515A1
Application number: PCT/CN2017/118554
Authority: WO
Inventors: 李磊; 杨海华; 李红志; 吕小科; 陈友飞
Original assignee: 苏州绿控传动科技有限公司
Priority date: 2016-12-26
Filing date: 2017-12-26
Publication date: 2018-07-05
Also published as: CN106499790A

Abstract

An electric drive axle, comprising a differential (1), a first wheel (2) arranged on a first side of the differential (1), and a second wheel (3) arranged on a second side of the differential (1), a first output side of the differential (1) being connected to the first wheel (2) by means of an axle shaft (4) and a second output side of the differential (1) being connected to the second wheel (3) by means of an axle shaft (4), and the axle shaft (4) comprising a first axle shaft (4) and a second axle shaft (4); a main reduction gear (5) is connected to an input ring gear of the differential (1) in an engaged sleeved manner, a first motor (6) being sleeved over the first axle shaft (4) and a second motor (7) being sleeved over the second axle shaft (4), a first motor shaft (8) of the first motor (6) and a second motor shaft (9) of the second motor (7) both being hollow shafts, the first axle shaft (4) penetrating through the centre of the first motor shaft (8) and the second axle shaft (4) penetrating through the centre of the second motor shaft (9), and a first input gear (10) being sleeved over an output end of the first motor shaft (8) and a second input gear (11) being sleeved over an output end of the second motor shaft (9).

Description

Electric drive axle

Technical field

The present disclosure relates to the technical field of new energy vehicles, for example to an electric drive axle.

Background technique

With the rapid development of China's economic construction and the continuous improvement of people's living standards, China's car ownership is also increasing, which brings tremendous pressure on China's resources and environment. As an important chemical raw material, oil, more than half of it is used as fuel for motor vehicles. Therefore, the development of energy-saving vehicles and the use of alternative energy sources are the main ways to alleviate current energy pressures.

The use of pure electric energy as a new energy vehicle has become the mainstream trend. However, the electric vehicle in the related art only has one power motor. When the output end of the power motor is connected with a shifting structure, the shifting structure is in the shifting process. The power interruption of the electric vehicle affects the comfort of the vehicle, and on the climbing section, it may affect the driving safety of the vehicle.

Summary of the invention

The present disclosure provides an electric drive axle, so that the power of the entire vehicle during the shifting process of the electric vehicle is not interrupted, ensuring the comfort and safety of driving, and the gears of the two motors passing through different speed ratios can be realized through the transmission. Combined drive, and the structure is highly integrated and easy to install.

An electric drive axle includes a differential and a first wheel disposed on a first side of the differential and a second wheel disposed on a second side of the differential, the first output side of the differential passing through the half shaft Connecting the first wheel and the second output side of the differential to the second wheel via a half shaft, wherein

The half shaft includes a first half shaft and a second half shaft;

The input ring gear upper engagement sleeve of the differential is connected with a main reduction gear;

The first motor shaft is provided with a first motor and the second half shaft is provided with a second motor;

The first motor shaft of the first motor and the second motor shaft of the second motor are both hollow shafts, the first motor shaft center penetrates the first half shaft and the second motor shaft center penetrates the second half shaft, The output end of the first motor shaft is fixedly mounted with a first input gear, and the output end of the second motor shaft is fixedly mounted with a second input gear;

The first input gear is meshed with an input end of the first transmission shifting structure, an output end of the first transmission shifting structure is engaged with an outer end tooth surface of the main reduction gear, and the second input gear is meshed with the connection An input end of the second transmission shifting structure, an output end of the second transmission shifting structure meshing with an outer end tooth surface of the main reduction gear.

Optionally, the first transmission shifting structure is disposed at a first end of the axis of the axle shaft and the second transmission shifting structure is disposed at a second end of the axis of the axle shaft to ensure an output end of the first transmission shifting structure The output end of the second transmission shifting structure and the outer end tooth surface of the main reduction gear are independently connected without interfering with each other.

Optionally, the first transmission shifting structure and the second transmission shifting structure are gearbox structures.

The first transmission shifting structure includes a first intermediate shaft assembly, a two-speed output gear A, a first synchronizer, a first output shaft, and a first output gear, and the two-speed output gear A includes an output second gear A And outputting a gear A, the first intermediate shaft assembly is respectively provided with a first transmission gear A and a second transmission gear A, the first transmission gear A meshingly connecting the first input gear, the first synchronization The set is disposed at an input end of the first output shaft, the first side of the first synchronizer is arranged with an output second gear A and the second side of the first synchronizer is arranged with an output gear A, the output The second gear A and the first transmission gear A are meshed and connected, the output first gear A and the second transmission gear A are meshed and connected, and the output end of the first output shaft is sleeved with the first An output gear that meshes with an outer end tooth surface of the main reduction gear.

The second transmission shifting structure includes a second intermediate shaft assembly, a two-speed output gear B, a second synchronizer, a second output shaft, and a second output gear, and the two-speed output gear B includes an output second gear B And outputting a gear B, the second intermediate shaft assembly is respectively provided with a first transmission gear B and a second transmission gear B, the first transmission gear B meshingly connecting the second input gear, the second synchronization The set is disposed at an input end of the second output shaft, the first side of the second synchronizer is arranged with an output second gear B and the second side of the second synchronizer is arranged with an output gear B, the output The second gear B and the first transmission gear B are meshingly connected, the output first gear B and the second transmission gear B are meshed and connected, and the output end of the second output shaft is provided with the second An output gear that meshes with an outer end tooth surface of the main reduction gear.

a first support baffle of the differential is disposed with a first support baffle and a second output side of the differential is provided with a second support baffle, the first support baffle being located adjacent to the first motor One side of the second support partition is disposed adjacent to a side of the second motor, and the main reduction gear is located in a space between the first support partition and the second support partition.

One end of the first intermediate shaft of the first intermediate shaft assembly near the differential is supported by a positioning hole on the first supporting partition, and the second intermediate shaft is assembled by a second intermediate shaft A positioning hole near the end of the differential supported on the second supporting partition ensures that the entire structure is conveniently installed.

The electric drive axle of the present disclosure can realize the combination of the two motors through the gears of different speed ratios through the transmission, ensuring that the rotational speeds of the corresponding first transmission shifting structure and the output end of the second transmission shifting structure of the two motors are consistent. Make sure that the dual motor drives the main reduction gear through a combination of gears of different speed ratios.

DRAWINGS

1 is a schematic structural view of a coaxial dual-motor electric drive bridge provided by an embodiment;

The names corresponding to the serial numbers in the figure are as follows:

Differential 1, first wheel 2, second wheel 3, half shaft 4, final reduction gear 5, first motor 6, second motor 7, first motor shaft 8, second motor shaft 9, first input gear 10. The second input gear 11, the first transmission shifting structure 12, the second transmission shifting structure 13, the first intermediate shaft assembly 14, the first synchronizer 15, the first output shaft 16, the first output gear 17, Output second gear A18, output first gear A19, first transmission gear A20, second transmission gear A21, second intermediate shaft assembly 22, second synchronizer 23, second output shaft 24, second output gear 25, The second gear B26, the output first gear B27, the first transmission gear B28, the second transmission gear B29, the first support partition 30, and the second support partition 31 are output.

detailed description

An electric drive axle, see FIG. 1: includes a differential 1, a first wheel 2 disposed on a first side of the differential 1 and a second wheel 3 disposed on a second side of the differential 1, in this embodiment The electric drive axle is a coaxial two-motor electric drive axle, the first output side of the differential 1 is connected to the first wheel 2 via the half shaft 4 and the second output side of the differential 1 is connected via the half shaft 4 to the second The wheel 3 and the half shaft 4 include a first half shaft 4 and a second half shaft 4, and the input ring gear of the differential 1 is coupled to the main reduction gear 5, and the first motor shaft 6 is provided with a first motor 6 and The second half shaft is provided with a second motor 7, the first motor shaft 8 of the first motor 6 and the second motor shaft 9 of the second motor 7 are both hollow shafts, and the first motor shaft 8 has a first half running through the center thereof. The shaft 4 and the second motor shaft 9 are centrally inserted through the second half shaft 4, and the output end of the first motor shaft 8 is fixedly mounted with the first input gear 10, and the output end of the second motor shaft 9 is fixedly mounted with the second input gear 11 The first input gear 10 is meshed with the input end of the first transmission shifting structure 12, and the output end of the first transmission shifting structure 12 is meshed with the main reduction gear 5 The outer end of the tooth surface, a second input connected to a second transmission gear 11 is meshed structure shift input terminal 13, the output of the second gear shift connecting structure 13 engaging the outer end of the main reduction gear 5 tooth surfaces.

A first transmission shifting structure 12 is disposed at a first end of the axis of the axle shaft 4 and a second transmission shifting structure 13 is disposed at a second end of the axis of the axle shaft 4 to ensure an output of the first transmission shifting structure 12 The output end of the end and the second transmission shifting structure 13 and the outer end tooth surface of the main reduction gear 5 are independently connected without interfering with each other;

The first transmission shifting structure 12 and the second transmission shifting structure 13 may be a gearbox structure;

The first transmission shifting structure 12 includes a first intermediate shaft assembly 14, a two-speed output gear A, a first synchronizer 15, a first output shaft 16, and a first output gear 17, and the two-speed output gear A includes an output second gear A18, output a gear A19, the first intermediate shaft assembly 14 is respectively provided with a first transmission gear A20 and a second transmission gear A21, the first transmission gear A20 is meshed with the first input gear 10, and the first synchronizer 15 is set. At the input end of the first output shaft 16, the first side of the first synchronizer 15 is arranged with an output second gear A18 and the second side of the first synchronizer 15 is arranged with an output gear A19, and the output second gear A18 is coupled to the first transmission gear A20, and the output first gear A19 and the second transmission gear A21 are meshed and connected. The output end of the first output shaft 16 is provided with a first output gear 17, and the first output gear 17 meshes with the main deceleration. The outer end tooth surface of the gear 5, the first synchronizer 15 engages and outputs any one of the second gear A18 and the output first gear A19, that is, in the corresponding gear position;

The second transmission shifting structure 13 includes a second intermediate shaft assembly 22, a two-speed output gear B, a second synchronizer 23, a second output shaft 24, and a second output gear 25, and the two-speed output gear B includes an output second gear. B26 and output first gear B27, the second intermediate shaft assembly is respectively provided with a first transmission gear B28 and a second transmission gear B29, the first transmission gear 28B is meshed with the second input gear 11, and the second synchronizer 23 is set The input end of the second output shaft 24, the first side of the second synchronizer 23 is arranged with the output second gear B26. The second side of the second synchronizer 23 is arranged with an output gear B27, the output second gear B26 and the first The transmission gear B28 is meshed with the connection arrangement, the output first gear B27 and the second transmission gear B29 are meshed with the connection arrangement, the output end of the second output shaft 24 is provided with the second output gear 25, and the second output gear 25 is meshed with the outer reduction gear 5 The end tooth surface, the second synchronizer 23 engages one of the output second gear B26 and the output first gear B27, that is, in the corresponding gear position;

The first output side of the differential 1 is provided with a first support partition 30 and the second output side of the differential 1 is provided with a second support partition 31, the first support partition 30 being located adjacent to the first motor 6 a side arrangement, the second support partition 31 is disposed on a side close to the second motor 7, and the main reduction gear 5 is located in a space between the first support partition 30 and the second support partition 31;

One end of the first intermediate shaft of the first intermediate shaft assembly 14 near the differential 1 is supported by a positioning hole on the first supporting partition 30, and the second intermediate shaft of the second intermediate shaft assembly 22 is close to the differential. One end of 1 is supported by a positioning hole on the second supporting partition 31 to ensure easy installation of the entire structure.

In the electric drive axle provided by this embodiment, the first motor 6 transmits torque to the first input gear 10 through the first motor shaft 8, wherein the first motor shaft 8 and the first input gear 10 are integrated; the first input gear 10 Engaging with the first transmission gear A20, the first transmission gear A20 on the first intermediate shaft assembly 14 meshes with the output second gear A18, and the second transmission gear A21 meshes with the output first gear A19 when the first synchronizer 15 When combined with the output first gear A19, the first speed ratio is output. When the first synchronizer 15 is engaged with the output second gear A18, the output is the second speed ratio; the first synchronizer 15 and the first output shaft 16 pass the flower. The keys are connected, the first output gear 17 is integral with the first output shaft 16, the first output gear 17 meshes with the main reduction gear 5, the main reduction gear 5 is integrated with the differential 1 assembly, and the corresponding half shaft 4 passes through the first The motor shaft 8 is connected to the differential 1;

Similarly, the second motor 7 transmits torque through the second motor shaft 9 to the second input gear 11, wherein the second motor shaft 9 and the second input gear 11 are of a unitary structure; the second input gear 11 and the first transmission gear B28 Engage, the first transfer gear B28 on the second intermediate shaft assembly 22 meshes with the output second gear B26 and the second transfer gear B29 meshes with the output first gear B27, when the second synchronizer 23 is combined with the output first gear B27 When outputting the first speed ratio, when the second synchronizer 23 is engaged with the output second gear B26, the output is the second speed ratio; the second synchronizer 23 and the second output shaft 24 are connected by the spline, the second output gear 25 is integrated with the second output shaft 24, the second output gear 25 meshes with the main reduction gear 5, the main reduction gear 5 is integrated with the differential 1 , and the corresponding half shaft 4 passes through the second motor shaft 9 and the differential 1 connected;

When preparing for shifting, the first motor 6 raises the torque, the second motor 7 torque drops to 0, and the second transmission shifting structure 13 shifts. After the shift is completed, the second motor 7 increases the torque, and the first motor 6 torques. Returning to zero, the power is uninterrupted at this time. After the first transmission shifting structure 12 shifts, both motors complete the shifting, and the torque of the first motor 6 and the second motor 7 return to normal, and the whole can be realized at this time. When the gear position is switched, the outer end tooth surface of the main reduction gear 5 always has a continuous power input.

After adopting the above technical solution, the first motor drives the module shifting strategy: the second motor increases the torque, the first motor torque drops to 0, and then the first transmission shifting structure shifts to realize the first motor drive from the first gear to the first gear The second gear is switched, the shift is completed, then the first motor increases the torque, the second motor is turned down, the first motor and the second motor torque return to normal, and the entire shifting process has no power interruption;

The second motor drive module shifting strategy: the first motor increases the torque, the second motor torque drops to 0, and then the second transmission shifting structure performs the shifting, so that the second motor drive is switched from the first gear to the second gear. After the gear is completed, the second motor increases the torque, the first motor is reduced in twisting, the first motor and the second motor torque return to normal, and the entire shifting process has no power interruption;

The two motor drive modules have to be shifted at the same time. In this process, the overall gear position can be switched at this time. The outer end tooth surface of the main reduction gear always has continuous power input, which makes the electric vehicle in the shifting process. The power of the entire vehicle is not interrupted, ensuring the comfort and safety of driving, and its structural integration is high and easy to install. The electric drive axle provided by this embodiment can realize the following four power combinations according to the power requirement of the whole vehicle.

The electric drive axle provided in this embodiment has no power interruption for shifting; the coaxial design has higher integration; the dual motor design, the high efficiency region of the motor is better used, and the automatic speed shift is realized.

Industrial applicability

The electric drive axle of the present disclosure makes the electric vehicle of the electric vehicle not interrupted during the shifting process, ensures the comfort and safety of the driving, and has high structural integration and is easy to install.

Claims

An electric drive axle includes a differential, a first wheel disposed on a first side of the differential, and a second wheel disposed on a second side of the differential, the first output side of the differential passing The first wheel and the second output side of the differential are connected to the second wheel by a half shaft, wherein

The half shaft includes a first half shaft and a second half shaft;

The input ring gear upper engagement sleeve of the differential is connected with a main reduction gear;

The first motor shaft is provided with a first motor and the second half shaft is provided with a second motor;

The first motor shaft of the first motor and the second motor shaft of the second motor are both hollow shafts, and the first motor shaft center penetrates through the first half shaft and the second motor shaft center penetrates The second half shaft, the output end of the first motor shaft is fixedly mounted with a first input gear, and the output end of the second motor shaft is fixedly mounted with a second input gear;

The first input gear is meshed with an input end of the first transmission shifting structure, an output end of the first transmission shifting structure is engaged with an outer end tooth surface of the main reduction gear, and the second input gear is meshed with the connection An input end of the second transmission shifting structure, an output end of the second transmission shifting structure meshing with an outer end tooth surface of the main reduction gear.
An electric drive axle according to claim 1 wherein said first transmission shifting structure is disposed at a first end of said axle of said axle shaft and said second transmission shifting structure is disposed at said axle axle The second end of the axis ensures that the output end of the first transmission shifting structure, the output end of the second transmission shifting structure and the outer end tooth surface of the main reduction gear are independently connected without interfering with each other.
An electric drive axle according to claim 1 or 2, wherein said first transmission shifting structure and said second transmission shifting structure are gearbox structures.
An electric drive axle according to claim 1 or 2, wherein said first transmission shifting structure comprises a first intermediate shaft assembly, a two-speed output gear A, a first synchronizer, a first output shaft, and a An output gear, the two-speed output gear A includes an output second gear A and an output first gear A, and the first intermediate shaft assembly is respectively provided with a first transmission gear A and a second transmission gear A, a first transmission gear A meshingly coupled to the first input gear, a first synchronizer being disposed at an input end of the first output shaft, a first side of the first synchronizer being disposed with an output second gear A and the first The second side of the synchronizer is arranged with an output first gear A, the output second gear A and the first transmission gear A are meshed with the connection arrangement, and the output first gear A and the second transmission gear A are meshed with each other. Arranged, the output end of the first output shaft is fitted with the first output gear, and the first output gear meshes with an outer end tooth surface of the main reduction gear.
An electric drive axle according to claim 4, wherein said second transmission shifting structure comprises a second intermediate shaft assembly, a two-speed output gear B, a second synchronizer, a second output shaft, and a second output a gear, the two-speed output gear B includes an output second gear B and an output first gear B, and the second intermediate shaft assembly is respectively provided with a first transmission gear B and a second transmission gear B, the first a transmission gear B meshingly coupled to the second input gear, a second synchronizer being disposed at an input end of the second output shaft, a first side of the second synchronizer being disposed with an output second gear B and the second synchronizer The second side of the second side is arranged with an output gear B, the output second gear B and the first transmission gear B are meshingly connected, and the output first gear B and the second transmission gear B are meshed and connected. An output end of the second output shaft is fitted with the second output gear, and the second output gear meshes with an outer end tooth surface of the main reduction gear.
An electric drive axle according to claim 5, wherein the first output side of the differential is provided with a first support baffle and the second output side of the differential is provided with a second support baffle The first supporting partition is disposed on a side close to the first motor, the second supporting partition is disposed on a side close to the second motor, and the main reduction gear is located at the first support In the space between the partition and the second supporting partition.
An electric drive axle according to claim 6, wherein a first intermediate shaft of said first intermediate shaft assembly near said differential is supported by a positioning hole on said first supporting partition The end of the second intermediate shaft of the second intermediate shaft assembly adjacent to the differential is supported by a positioning hole on the second supporting partition.