WO2021087946A1

WO2021087946A1 - Two-gear variable-speed bridge drive system having dual clutch

Info

Publication number: WO2021087946A1
Application number: PCT/CN2019/116531
Authority: WO
Inventors: 刘磊; 黄超; 柳璇; 汤清
Original assignee: 舍弗勒技术股份两合公司; 刘磊
Priority date: 2019-11-08
Filing date: 2019-11-08
Publication date: 2021-05-14
Also published as: CN114222677A

Abstract

A two-gear variable-speed bridge drive system having a dual clutch, comprising a dual clutch (DC), a planetary gear set (PG) and a differential (D). A motor shaft (Se) is connected to a rotor of a motor (E) and an active part of the dual clutch (DC); a first driven disc (C1) of the dual clutch (DC) is connected to a first input shaft (S1), and a second driven disc (C2) is connected to a second input shaft (S2). The first input shaft (S1) is used to transmit the torque to a first gear set; the second input shaft (S2) is used to transmit the torque to a second gear set; and both the first gear set and the second gear set are used to transmit the torque to an output shaft (So), the output shaft (So) being connected to a sun gear of the planetary gear set (PG); and a planet carrier of the planetary gear set (PG) is connected to a housing of the differential (D). According to the two-gear variable-speed bridge drive system having a dual clutch, all of the components have a simple and compact structure, the system is highly reliable, the impact of NVH is small and gear shifting can be free from power interruption.

Description

Two-speed transmission electric axle drive system with dual clutch

Technical field

The present invention relates to the field of motor vehicles, in particular to the field of vehicle transmissions, in particular to an electric bridge drive system in a pure electric vehicle or a hybrid vehicle, and more particularly to a two-speed transmission electric bridge drive system with dual clutches.

Background technique

For electric vehicles, including pure electric vehicles and hybrid (oil-electric hybrid) vehicles, the electric drive methods include central motor drive and wheel hub motor drive. A common arrangement form of the central motor drive system is also called an electric bridge (eAxle) drive system.

Figures 1 to 3 show a two-speed transmission bridge drive system. The system includes a motor E, a differential D, a planetary gear set PG, a synchronizer 10, a motor shaft Se, an input shaft Si, and a gear shaft Sp , Intermediate shaft Sm and two gear pairs.

The motor E and the transmission are separated, and the motor shaft Se is connected to the input shaft Si of the transmission through a spline. The input shaft Si is partially nestedly connected with the gear shaft Sp provided with the first gear pair driving wheel 21. The motor shaft Se, the sun gear of the planetary gear set PG, the input shaft Si, and the gear shaft Sp are coaxially arranged. The motor shaft Se is supported by the motor housing, the gear shaft Sp is supported by the transmission housing, one end of the input shaft Si is supported by the transmission housing, and the other end is supported by the gear shaft Sp nested therewith. The intermediate shaft Sm provided with the second gear pair driving wheel 31 is supported by the housing of the transmission, and the intermediate shaft Sm is also installed with the first gear pair driven wheel 22. The second gear pair driven wheel 32 is mounted on the housing of the differential D.

The change of the system speed gear is realized by the synchronizer 10 with a special structure. The gear hub 12 of the synchronizer 10 is connected to the gear shaft Sp through a spline, and the sliding sleeve 11 is supported by the input shaft Si through the synchronizing ring, and is also supported by the gear shaft Sp through the gear hub 12. An engagement ring gear 13 for engaging with the sliding sleeve 11 in the first gear is welded to the planet carrier of the planetary gear set PG, and is supported by the input shaft Si; used with the sliding sleeve in the second gear The other engagement ring gear 14 to which 11 engages is connected to the input shaft Si through a spline.

2, when the sliding sleeve 11 is engaged with the engagement ring gear 13, the system is in the first gear, and the power from the motor E is input from the sun gear of the planetary gear set PG, output from the planet carrier, and then sequentially transmitted through the gear 13, Sliding sleeve 11, gear hub 12, gear shaft Sp, first gear to driving wheel 21, first gear to driven wheel 22, intermediate shaft Sm, second gear to driving wheel 31, second gear to driven wheel 32 to differential器D.

3, when the sliding sleeve 11 is engaged with the engagement ring gear 14, the system is in the second gear, and the power of the input shaft Si is transmitted to the engagement ring gear 14, and then sequentially transmitted through the sliding sleeve 11, the gear hub 12, and the gear shaft Sp , The first gear to the driving wheel 21, the first gear to the driven wheel 22, the intermediate shaft Sm, the second gear to the driving wheel 31, the second gear to the driven wheel 32 to the differential D.

The above system has at least the following problems:

The coaxially arranged motor shaft Se, input shaft Si, and gear shaft Sp are provided separately. In particular, the input shaft Si and the gear shaft Sp need to be able to rotate relative to each other, and the gear shaft Sp needs to provide support for the input shaft Si, and the input shaft Si needs to be able to rotate relative to each other. Provide support for the planet carrier. Not only the number of rotating shafts of the system is large, but the separate supporting structure provided for each rotating part is complicated, and the number of bearings is large, which makes the system high in cost and low in reliability.

The planetary gear set PG, as the first-stage reduction gear, has a high speed, which is not conducive to the system's NVH control.

The horizontal position of the rotation axis of the sun gear of the planetary gear set PG is high, which increases the difficulty of lubricating the planetary gear set PG.

The synchronizer 10 has a special and complex structure, high manufacturing cost and low reliability, and the synchronizer 10 occupies a large space in the axial direction of the system, which is not conducive to the design requirement of a small size in the axial direction of the system.

When the synchronizer 10 is used for shifting, the power transmission of the system is interrupted during the shifting process.

Summary of the invention

The purpose of the present invention is to overcome or at least alleviate the above-mentioned shortcomings of the prior art, and provide a two-speed transmission bridge drive system with a double clutch with a simple and compact structure.

The invention provides a two-speed transmission bridge drive system with dual clutches, which includes a housing of the system, a motor, a dual clutch, a planetary gear set, a differential, a motor shaft, a first input shaft, a second input shaft, The output shaft, the first gear set and the second gear set, of which,

The motor shaft is non-rotatably connected to the rotor of the motor and the active part of the dual clutch, and the active part can be selectively engaged with the first driven disc or the second driven disc of the dual clutch to Transmit torque,

The first driven disc is connected to the first input shaft in a non-rotatable manner, and the second driven disc is connected to the second input shaft in a non-rotatable manner,

The first input shaft is used to transmit torque to the first gear set, and the second input shaft is used to transmit torque to the second gear set,

The first gear set and the second gear set are both used to transmit torque to the output shaft,

The output shaft is non-rotatably connected with the sun gear of the planetary gear set, the planet carrier of the planetary gear set is non-rotatably connected with the housing of the differential, and the ring gear of the planetary gear set It is connected to the housing of the system in a non-rotatable manner.

In at least one embodiment, the first gear set includes a first gear set driving wheel and a first gear set driven wheel that mesh with each other, and the second gear set includes a second gear set driving wheel and a second gear set that mesh with each other. Gear set driven wheel,

The first input shaft is connected to the driving wheel of the first gear set in a non-rotatably connected manner, and the second input shaft is connected to the driving wheel of the second gear set in a non-rotatably connected manner,

The driven wheels of the first gear set and the driven wheels of the second gear set are both non-rotatably connected with the output shaft.

In at least one embodiment, the number of teeth of the driving wheel of the first gear set is less than the number of teeth of the driven wheel of the first gear set, and the number of teeth of the driving wheel of the second gear set is less than the number of teeth of the driven wheel of the second gear set The number of teeth of the driving wheel of the first gear set is smaller than the number of teeth of the driving wheel of the second gear set.

In at least one embodiment, the second input shaft is a hollow shaft, the second input shaft is sleeved on the first input shaft, and the second input shaft can rotate relative to the first input shaft, Both the second input shaft and the first input shaft are arranged coaxially with the motor shaft.

In at least one embodiment, the output shaft is a hollow shaft, and one output half shaft of the differential passes through the output shaft.

In at least one embodiment, the planet carrier is formed integrally with the housing of the differential.

In at least one embodiment, the output shaft is parallel to the motor shaft and is offset relative to the motor shaft in the radial direction of the motor shaft.

In at least one embodiment, the level of the differential is lower than the level of the motor.

In at least one embodiment, the support member of the output shaft includes a support plate, and the support plate is detachably mounted to the housing of the system with respect to the housing of the system.

In at least one embodiment, when the first driven disc is engaged with the driving part and the second driven disc is separated from the driving part, the system is in a gear;

When the first driven disk is separated from the driving part and the second driven disk is engaged with the driving part, the system is in another gear.

According to the two-speed transmission electric axle drive system with dual clutches of the present invention, each component has a simple and compact structure, high system reliability, small NVH influence, and no power interruption during gear shifting.

Description of the drawings

Figures 1 to 3 are schematic diagrams of a possible two-speed electric axle drive system.

Fig. 4 is a schematic diagram of a two-speed transmission bridge drive system with dual clutches according to an embodiment of the present invention.

Fig. 5 is a schematic diagram of the power transmission path of the electric bridge drive system shown in Fig. 4 in the first gear.

Fig. 6 is a schematic diagram of the power transmission path of the electric bridge drive system shown in Fig. 4 in the second gear.

Description of Reference Signs

10 synchronizer; 11 sliding sleeve; 12 gear hub; 13, 14 joint gear ring;

21 the first gear to the driving wheel; 22 the first gear to the driven wheel; 31 the second gear to the driving wheel; 32 the second gear to the driven wheel;

E motor; PG planetary gear set; D differential;

Sp gear shaft; Sm intermediate shaft; Se motor shaft; Si input shaft; S1 first input shaft; S2 second input shaft; So output shaft;

DC double clutch; C1 first driven disc; C2 second driven disc;

G11 first gear set driving wheel; G12 first gear set driven wheel; G21 second gear set driving wheel; G22 second gear set driven wheel.

Detailed ways

Hereinafter, exemplary embodiments of the present invention will be described with reference to the accompanying drawings. It should be understood that these specific descriptions are only used to teach those skilled in the art how to implement the present invention, and are not used to exhaust all possible ways of the present invention, nor are they used to limit the scope of the present invention.

Unless otherwise specified, referring to Fig. 4, A represents the axial direction of the electric bridge drive system, and the axial direction A is consistent with the axial direction of the motor shaft Se of the motor E in the electric bridge drive system; R represents the radial direction of the electric bridge drive system, This radial direction R coincides with the radial direction of the motor shaft Se of the motor E in the electric bridge drive system.

First, referring to FIG. 4, the structure of an electric bridge drive system according to an embodiment of the present invention will be described.

The electric bridge drive system according to the present invention includes a motor E, a motor shaft Se, a first input shaft S1, a second input shaft S2, an output shaft So, a dual clutch DC, a first gear set, a second gear set, and a differential D And planetary gear set PG.

The dual clutch DC is provided between the motor E and the gearbox, and the dual clutch DC is used to selectively transmit the torque from the motor E to the first gear set or the second gear set. One gear in the first gear set and one gear in the second gear set are both connected to the sun gear of the planetary gear set PG in a rotationally fixed manner (non-rotatably). The planet carrier of the planetary gear set PG is connected to the housing of the differential D in a torque-proof manner. Through the cooperation of the first gear set and the planetary gear set PG, the first gear of the transmission is obtained; through the cooperation of the second gear set and the planetary gear set PG, the second gear of the transmission is obtained.

The detailed connection method of each component is introduced below.

The rotor of the motor E is connected to the motor shaft Se in a torque-proof manner.

The dual clutch DC includes an active part, a first driven disc C1 and a second driven disc C2. The active part of the dual clutch DC is, for example, a housing of the dual clutch DC. The driving part can be selectively engaged with the first driven disc C1 or the second driven disc C2.

Preferably, the dual clutch DC can use a modular and versatile existing dual clutch assembly.

The driving part of the dual clutch DC is connected to the motor shaft Se in a torque-proof manner, and the first driven disc C1 is connected to the first input shaft S1 in a torsion-proof manner, and the second driven disc C2 is connected to the second input shaft S2 in a torsion-proof manner. The first driven disc C1 and the second driven disc C2 are spaced apart in parallel in the axial direction A, the second input shaft S2 is a hollow shaft, the second input shaft S2 is sleeved on the first input shaft S1, and the first input shaft S2 The shaft S1 and the second input shaft S2 can rotate relatively. The first input shaft S1 passes through the inside of the second input shaft S2 and both are arranged coaxially with the motor shaft Se.

The first gear set includes a first gear set driving wheel G11 and a first gear set driven wheel G12 that are always in mesh with each other, and the second gear set includes a second gear set driving wheel G21 and a second gear set driven wheel G22 that are always meshed with each other.

The driving wheel G11 of the first gear set is connected to the first input shaft S1 in a rotationally fixed manner, and the driving wheel G21 of the second gear set is connected to the second input shaft S2 in a rotationally fixed manner.

The first gear set driven wheel G12 and the second gear set driven wheel G22 are both connected to the output shaft So in a torque-proof manner. The output shaft So is also connected to the sun gear of the planetary gear set PG in a torque-proof manner. The output shaft So is parallel to the motor shaft Se and is offset relative to the motor shaft Se in the radial direction R. And preferably, the level of the output shaft So is lower than the level of the motor shaft Se.

Preferably, the number of teeth of the driving wheel G11 of the first gear set is less than the number of teeth of the driven wheel G12 of the first gear set, and the number of teeth of the driving wheel G21 of the second gear set is less than the number of teeth of the driven wheel G22 of the second gear set.

The ring gear of the planetary gear set PG is connected to the housing of the system (also called the housing of the transmission) in a torque-proof manner. The planet carrier of the planetary gear set PG is connected to the housing of the differential D in a torque-proof manner, or the planet carrier and the housing of the differential D are formed as one body.

The output shaft So is a hollow shaft, and one output half shaft of the differential D can axially pass through the output shaft So.

The output shaft So is supported by the housing of the system. According to the different setting modes of the housing, a boss for supporting the output shaft So can be formed inside the housing, and the setting of the boss does not interfere with the installation of other parts (such as gears); it can also be provided for the system to be compatible with the housing. The support plate is detachably connected to the body. The support plate is used to support the output shaft So. The support plate can be fixed to the inner cavity of the housing by bolts, for example. The detachable support plate avoids the interference of the installation of parts and makes the system housing The structure is simplified.

Next, referring to FIGS. 5 and 6, the power transmission path of the electric bridge drive system according to the present invention in two speed gears will be described.

5, in the first gear, the first driven disc C1 of the dual clutch DC is engaged with the driving part of the clutch, and the second driven disc C2 of the dual clutch DC is disengaged from the driving part of the clutch. The torque of the motor E is sequentially transmitted through the motor shaft Se, the driving part of the dual clutch DC, the first driven disc C1, the first input shaft S1, the first gear set driving wheel G11, the first gear set driven wheel G12, and the output shaft So , The sun gear, planet gears, planet carrier to differential D of planetary gear set PG.

6, in the second gear, the first driven disc C1 of the dual clutch DC is separated from the driving part of the clutch, and the second driven disc C2 of the dual clutch DC is engaged with the driving part of the clutch. The torque of the motor E is sequentially transmitted through the motor shaft Se, the driving part of the dual clutch DC, the second driven disc C2, the second input shaft S2, the second gear set driving wheel G21, the second gear set driven wheel G22, and the output shaft So , The sun gear, planet gears, planet carrier to differential D of planetary gear set PG.

The following briefly describes some of the beneficial effects of the above-mentioned embodiments of the present invention.

(i) The planetary gear set PG is arranged on the output shaft So downstream of the power transmission path of the system. Compared with the method in which the planetary gear set PG is arranged on the input shaft, on the one hand, the rotation speed of the rotating parts of the planetary gear set PG is lower. It is convenient to reduce the NVH of the system; on the other hand, the horizontal position of the planetary gear set PG is reduced, which is beneficial to the lubrication control of the planetary gear set PG.

(ii) The shifting of the system uses a modular dual clutch, which is easy to install, and for automotive parts suppliers, for example, the modular dual clutch can be taken from mature dual clutch transmission products, and the cost of component manufacturing is low.

(iii) The components of the present invention are simple in structure, especially the shifting components can use conventional dual clutches, so that the system has a compact structure, high reliability and low cost.

(iv) During the shifting process of dual clutch DC, while one driven disc is separated from the active part of the dual clutch DC, the other driven disc can gradually engage with the active part of the dual clutch DC, so that the power transmission of the system No interruption.

It should be understood that the above-mentioned embodiments are only exemplary and are not used to limit the present invention. Those skilled in the art can make various modifications and changes to the above-mentioned embodiments under the teaching of the present invention without departing from the scope of the present invention. For example, the first gear set and the second gear set in the present invention may not be limited to a gear pair composed of a pair (two) of gears. For example, it may also be a multi-stage capable gear composed of more than two gears. A gear set that transmits torque (that is, is composed of multiple gear pairs that can transmit torque in sequence).

Claims

A two-speed transmission bridge drive system with dual clutches, which includes the housing of the system, a motor (E), a dual clutch (DC), a planetary gear set (PG), a differential (D), and a motor shaft (Se ), the first input shaft (S1), the second input shaft (S2), the output shaft (So), the first gear set and the second gear set, where,

The motor shaft (Se) connects the rotor of the motor (E) and the active part of the dual clutch (DC) in a relatively non-rotatable manner, and the active part can be selectively connected with the second clutch (DC) A driven disk (C1) or a second driven disk (C2) is engaged to transmit torque,

The first driven disk (C1) and the first input shaft (S1) are connected in a non-rotatable manner, and the second driven disk (C2) and the second input shaft (S2) are connected in a non-rotatable manner connection,

The first input shaft (S1) is used to transmit torque to the first gear set, and the second input shaft (S2) is used to transmit torque to the second gear set,

The first gear set and the second gear set are both used to transmit torque to the output shaft (So),

The output shaft (So) and the sun gear of the planetary gear set (PG) are connected in a relatively non-rotatable manner, and the planet carrier of the planetary gear set (PG) and the housing of the differential (D) cannot face each other Rotationally connected, the ring gear of the planetary gear set (PG) and the housing of the system are connected in a relatively non-rotatable manner.
The two-speed transmission electric axle drive system with dual clutches according to claim 1, wherein the first gear set includes a first gear set driving wheel (G11) and a first gear set driven wheel (G11) that mesh with each other. G12), the second gear set includes a second gear set driving wheel (G21) and a second gear set driven wheel (G22) that mesh with each other,

The first input shaft (S1) and the first gear set driving wheel (G11) are not connected to each other for relative rotation, and the second input shaft (S2) and the second gear set driving wheel (G21) are not connected to each other Rotatably connected,

The first gear set driven wheel (G12) and the second gear set driven wheel (G22) are both non-rotatably connected to the output shaft (So).
The two-speed transmission electric axle drive system with dual clutches according to claim 2, wherein the number of teeth of the driving wheel (G11) of the first gear set is smaller than the number of teeth of the driven wheel (G12) of the first gear set The number of teeth of the driving wheel (G21) of the second gear set is smaller than the number of teeth of the driven wheel (G22) of the second gear set.
The two-speed transmission bridge drive system with dual clutches according to any one of claims 1 to 3, wherein the second input shaft (S2) is a hollow shaft, and the second input shaft (S2) is a hollow shaft. ) Is sleeved on the first input shaft (S1), the second input shaft (S2) can rotate relative to the first input shaft (S1), the second input shaft (S2) and the first input shaft The shafts (S1) are all arranged coaxially with the motor shaft (Se).
The two-speed transmission bridge drive system with dual clutches according to any one of claims 1 to 4, wherein the output shaft (So) is a hollow shaft, and one of the differentials (D) The output half shaft passes through the output shaft (So).
The two-speed transmission bridge drive system with dual clutches according to any one of claims 1 to 5, wherein the planet carrier and the housing of the differential (D) are formed as one body.
The two-speed transaxle drive system with dual clutches according to any one of claims 1 to 6, wherein the output shaft (So) is parallel to the motor shaft (Se) and is connected to the motor shaft (Se). The shaft (Se) is offset in the radial direction (R) with respect to the motor shaft (Se).
The two-speed transaxle drive system with dual clutches according to any one of claims 1 to 7, characterized in that the level of the differential (D) is lower than the level of the motor (E) height.
The two-speed transaxle drive system with dual clutches according to any one of claims 1 to 8, wherein the supporting member of the output shaft (So) comprises a supporting plate, and the supporting plate is opposite to the The housing of the system can be detachably mounted to the housing of the system.
The two-speed transmission electric axle drive system with dual clutches according to any one of claims 1 to 9, characterized in that:

When the first driven disk (C1) is engaged with the driving part and the second driven disk (C2) is separated from the driving part, the system is in a gear;

When the first driven disk (C1) is separated from the driving part and the second driven disk (C2) is engaged with the driving part, the system is in another gear.