Two-gear transmission electric axle drive system

Abstract

The application provides a two-gear variable-speed electric axle drive system, wherein an outer shaft (AO) is connected with a motor (M), the outer shaft (AO) has a hollow inner cavity, a first axle (A1) of a differential (D) passes through the inner cavity of the outer shaft (AO), a sun gear of a first planetary gear set (PGS1) is connected with the outer shaft (AO), a ring gear of the first planetary gear set (PGS1) is connected to a housing through a first clutch (C1), an annular carrier of the first planetary gear set (PGS1) is connected with a sun gear of a second planetary gear set (PGS2), the sun gear of the second planetary gear set (PGS2) is connected to the sun gear of the first planetary gear set (PGS1) through a second clutch (C2), an annular carrier of the second planetary gear set (PGS2) is connected with a differential housing of the differential (D), and a ring gear of the second planetary gear set (PGS2) is connected with the housing. The electric axle drive system according to the application uses two independent clutches to realize the selection of two transmission ratios, and has simple structure and convenient control.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of motor vehicles, in particular to the field of transmissions of vehicles, especially to the electric axle drive system in pure electric vehicles or hybrid vehicles, and more particularly to a two-gear electric axle drive system. BACKGROUND

[0002] For electric vehicles, including pure electric vehicles and hybrid vehicles, their electric driving modes include central motor driving and hub motor driving. A common arrangement of central motor driving system is also known as electric axle (eAxle) drive system.

[0003] Chinese utility model patent CN205859059U discloses a double clutch planetary gear type pure electric vehicle transmission. Referring to Figure 1 In this scheme, the motor M and the differential D are coaxially arranged. Between the motor M and the differential D, a double clutch DC and a planetary gear set PGS are provided. The planetary gear set PGS includes two groups of planetary gears arranged in parallel in the axial direction, each group of planetary gears is meshed with a sun gear, and the two groups of planetary gears are connected to the same planet carrier. The two inner hubs of the double clutch DC are connected to the two sun gears of the planetary gear set PGS through the nested inner shaft AI and outer shaft AO. By controlling the engagement state of the double clutch DC, the transmission ratio of the planetary gear set PGS can be changed to realize the function of two-gear transmission.

[0004] However, the above scheme has the following disadvantages:

[0005] (i) The double clutch DC has a large number of components and a complex structure, and accordingly, the control mode of the double clutch DC is complex and the cost is high;

[0006] (ii) The device corresponding to this design scheme occupies a large axial space;

[0007] (iii) Since the outer shaft AO is sleeved on the outer periphery of the inner shaft AI, the outer shaft AO is supported by the inner shaft AI and needs to be able to rotate relative to the inner shaft AI, which puts high requirements on the position accuracy of the outer shaft AO and the inner shaft AI;

[0008] (iv) The transmission ratio provided by a single planetary gear set PGS is limited, and when the transmission ratio is not large enough, the output torque of the motor needs to be increased, resulting in an increase in system cost. SUMMARY

[0009] The present application aims to overcome or at least alleviate the deficiencies of the prior art, and to provide a two-gear electric axle drive system with simple structure and convenient control.

[0010] The application provides a two-gear electric axle drive system, which comprises a housing, a motor, an outer shaft, a first planetary gear set, a second planetary gear set, a first clutch, a second clutch and a differential,

[0011] The outer shaft is connected with the rotor of the motor in a non-rotatable manner, the outer shaft has a hollow inner cavity through in the axial direction, a first half shaft as one output half shaft of the differential passes through the inner cavity of the outer shaft,

[0012] The sun gear of the first planetary gear set is connected with the outer shaft in a non-rotatable manner,

[0013] The ring gear of the first planetary gear set is connected to the housing through the first clutch,

[0014] The planet carrier of the first planetary gear set is connected with the sun gear of the second planetary gear set in a non-rotatable manner,

[0015] The sun gear of the second planetary gear set is connected to the sun gear of the first planetary gear set through the second clutch,

[0016] The planet carrier of the second planetary gear set is connected with the differential housing of the differential in a non-rotatable manner,

[0017] The ring gear of the second planetary gear set is connected with the housing in a non-rotatable manner.

[0018] In at least one embodiment, when the first clutch is in the engaged state and the second clutch is in the disengaged state, the electric axle drive system is in one gear; when the first clutch is in the disengaged state and the second clutch is in the engaged state, the electric axle drive system is in another gear.

[0019] In at least one embodiment, the first clutch and the first planetary gear set at least partially coincide in the axial direction.

[0020] In at least one embodiment, the inner hub of the first clutch is connected with the ring gear of the first planetary gear set, the outer hub of the first clutch is connected with the housing, and / or

[0021] The inner hub of the second clutch is connected with the sun gear of the second planetary gear set, and the outer hub of the second clutch is connected with the sun gear of the first planetary gear set.

[0022] In at least one embodiment, the housing comprises, in the axial direction, a motor end cover, a shared sub-housing, an inner support disc and a gear box sub-housing connected and detachable in sequence,

[0023] The common sub-housing is configured to house the electric motor and the first planetary gear set, the gear box sub-housing is configured to house the second planetary gear set and the differential,

[0024] The inner support disc provides support to the planet carrier of the first planetary gear set and the planet carrier of the second planetary gear set.

[0025] In at least one embodiment, the common sub-housing comprises a disc-shaped common sub-housing partition in the middle of the common sub-housing in the axial direction, the common sub-housing partition separates the electric motor and the first planetary gear set in the axial direction,

[0026] The outer shaft axially passes through the common sub-housing partition, a bearing for supporting the outer shaft is provided between the common sub-housing partition and the outer shaft,

[0027] A planet carrier first support portion is provided on the side of the common sub-housing partition facing the first planetary gear set, a bearing for providing support to the planet carrier of the first planetary gear set is provided at the planet carrier first support portion.

[0028] In at least one embodiment, a planet carrier second support portion is provided on the side of the inner support disc facing the first planetary gear set, a bearing for providing support to the planet carrier of the first planetary gear set is provided at the planet carrier second support portion,

[0029] A planet carrier third support portion is provided on the side of the inner support disc facing the second planetary gear set, a bearing for providing support to the planet carrier of the second planetary gear set is provided at the planet carrier third support portion.

[0030] In at least one embodiment, the housing comprises, in the axial direction, in sequence, a motor end cover, a motor sub-housing, a gear box sub-housing and a gear box end cover connected and detachable,

[0031] The motor sub-housing is configured to house the electric motor, the gear box sub-housing is configured to house the first planetary gear set and the second planetary gear set, and the gear box end cover is configured to house the differential.

[0032] In at least one embodiment, an end of the motor sub-housing away from the motor end cover has a disc-shaped motor sub-housing partition extending in the radial direction of the electric motor, the outer shaft axially passes through the motor sub-housing partition, a bearing for supporting the outer shaft is provided between the motor sub-housing partition and the outer shaft,

[0033] A planet carrier first support portion is provided on the side of the motor sub-housing partition facing the first planetary gear set, a bearing for providing support to the planet carrier of the first planetary gear set is provided at the planet carrier first support portion.

[0034] In at least one embodiment, an axial middle portion of the gear box sub-housing has a disc-shaped gear box sub-housing partition extending in the radial direction, the first planetary gear set and the second planetary gear set are respectively located on axial two sides of the gear box sub-housing partition,

[0035] A side of the gear box sub-housing partition facing the first planetary gear set is provided with a carrier second support portion, and the carrier second support portion is provided with a bearing for supporting a carrier of the first planetary gear set,

[0036] A side of the gear box sub-housing partition facing the second planetary gear set is provided with a carrier third support portion, and the carrier third support portion is provided with a bearing for supporting a carrier of the second planetary gear set.

[0037] The two-gear variable electric axle drive system according to the present application uses two independent clutches to realize the selection of two transmission ratios, and has simple structure and convenient control. BRIEF DESCRIPTION OF DRAWINGS

[0038] Figure 1 is a schematic diagram of a known two-gear variable electric axle drive system.

[0039] Figure 2 is a schematic diagram of a two-gear variable electric axle drive system according to a first embodiment of the present application.

[0040] Figure 3 and Figure 4 is Figure 2 schematic diagrams of power transmission paths of the electric axle drive system shown in FIG. 1 in two different gears.

[0041] Figure 5 is a schematic diagram of a two-gear variable electric axle drive system according to a second embodiment of the present application.

[0042] Reference sign explanation

[0043] M motor; D differential; DC dual clutch; PGS planetary gear set; AI inner shaft; AO outer shaft;

[0044] PGS1 first planetary gear set; PGS2 second planetary gear set; C1 first clutch; C2 second clutch; A1 first half shaft; A2 second half shaft;

[0045] Hem motor end cover; Hs common sub-housing; Hg, Hg2 gear box sub-housing; Hi inner support disc; Hsw common sub-housing partition;

[0046] Hm motor sub-housing; Hmw motor sub-housing barrier; Hgw gear case sub-housing barrier; Heg gear case end cover

[0047] S1 first support portion of the planet carrier; S2 second support portion of the planet carrier; S3 third support portion of the planet carrier. DETAILED DESCRIPTION

[0048] Exemplary embodiments of the present application will be described below with reference to the accompanying drawings. It is to be understood that the specific description is only for the purpose of teaching one skilled in the art how to implement the present application, and is not intended to limit the scope of the present application in any way.

[0049] Unless otherwise specified, reference Figure 2 , A denotes an axial direction of the axle drive system, which axial direction A coincides with an axial direction of the motor and the planetary gear sets in the axle drive system; R denotes a radial direction of the axle drive system, which radial direction R coincides with a radial direction of the motor and the planetary gear sets in the axle drive system.

[0050] (First Embodiment)

[0051] First, reference Figures 2 to 4 will be made to an axle drive system according to a first embodiment of the present application.

[0052] The axle drive system according to the present application includes a housing, a motor M, an outer shaft AO, a first axle half Al, a second axle half A2, a first clutch CI, a second clutch C2, a first planetary gear set PGS1, a second planetary gear set PGS2, and a differential D. The first axle half Al and the second axle half A2 are two output axle halves of the differential D.

[0053] A stator of the motor M is fixed to the housing, and a rotor of the motor M is connected to the outer shaft AO in a torsionally fixed manner (cannot rotate relative to each other).

[0054] A sun gear of the first planetary gear set PGS1 is connected to the outer shaft AO in a torsionally fixed manner.

[0055] An inner hub and an outer hub (two parts of a clutch that can be engaged or disengaged for transmitting or cutting off power) of the first clutch CI are connected to the housing and a ring gear of the first planetary gear set PGS1, respectively, in a torsionally fixed manner. When the first clutch CI is in an engaged state, the ring gear of the first planetary gear set PGS1 is connected to the housing in a torsionally fixed manner; when the first clutch CI is in a disengaged state, the ring gear of the first planetary gear set PGS1 can rotate relative to the housing.

[0056] A planet carrier of the first planetary gear set PGS1 is connected to a sun gear of the second planetary gear set PGS2 in a torsionally fixed manner.

[0057] The outer hub and the inner hub of the second clutch C2 are respectively torsionally connected to the sun gear of the first planetary gear set PGS1 and the sun gear of the second planetary gear set PGS2. When the second clutch C2 is in the engaged state, the sun gear of the second planetary gear set PGS2 is torsionally connected to the sun gear of the first planetary gear set PGS1; when the second clutch C2 is in the disengaged state, the sun gear of the second planetary gear set PGS2 can rotate relative to the sun gear of the first planetary gear set PGS1.

[0058] Preferably, since the first clutch C1 is partially connected to the housing, the actuator of the first clutch C1 can be integrated in the housing, for example, the piston of the actuator of the first clutch C1 can be arranged in the groove of the inner cavity of the housing. Preferably, since the inner hub of the first clutch C1 is connected to the ring gear of the first planetary gear set PGS1, the inner hub of the first clutch C1 can be integrated to the ring gear of the first planetary gear set PGS1. Preferably, since the outer hub and the inner hub of the second clutch C2 are respectively connected to the sun gear of the first planetary gear set PGS1 and the sun gear of the second planetary gear set PGS2, the outer hub and the inner hub of the second clutch C2 can be respectively integrated to the sun gear of the first planetary gear set PGS1 and the sun gear of the second planetary gear set PGS2.

[0059] Preferably, the first clutch C1 and the first planetary gear set PGS1 at least partially coincide in the axial direction A.

[0060] The above-mentioned arrangement of the clutches simplifies the structure of the clutches and saves the space of the system.

[0061] The ring gear of the second planetary gear set PGS2 is torsionally connected to the housing.

[0062] The carrier of the second planetary gear set PGS2 is torsionally connected to the differential housing of the differential D.

[0063] The outer shaft AO is hollow in the axial direction A, and the first half shaft A1 is arranged in parallel with the outer shaft AO by being nested in the inner cavity of the outer shaft AO.

[0064] The housing of the electric axle drive system comprises in sequence in the axial direction A a detachable motor end cover Hem, a shared sub-housing Hs, an inner support disc Hi and a gear box sub-housing Hg. The motor end cover Hem and the shared sub-housing Hs are connected in the axial direction A, for example by bolts. The shared sub-housing Hs, the inner support disc Hi and the gear box sub-housing Hg are connected in the axial direction A, for example by bolts.

[0065] The shared sub-housing Hs is used to accommodate the motor M and the first planetary gear set PGS1, and the gear box sub-housing Hg is used to accommodate the second planetary gear set PGS2 and the differential D.

[0066] The motor end cover Hem is disc-shaped, which closes the common sub-housing Hs near the motor M and provides support for the outer shaft AO. The middle part of the motor end cover Hem has an opening, and a bearing for supporting the outer shaft AO is arranged at the opening. The first half shaft A1 inside the outer shaft AO extends out of the housing through the motor end cover Hem.

[0067] The common sub-housing Hs is cylindrical, which includes a disc-shaped common sub-housing partition Hsw extending in the radial direction R at the end of the common sub-housing Hs, and the outer periphery of the common sub-housing partition Hsw is connected with the inner wall of the common sub-housing Hs. The common sub-housing partition Hsw is located between the motor M and the first planetary gear set PGS1 in the axial direction A. The common sub-housing partition Hsw provides support for the outer shaft AO and the carrier of the first planetary gear set PGS1.

[0068] The outer shaft AO passes through the common sub-housing partition Hsw in the axial direction A, and preferably, a bearing is arranged between the common sub-housing partition Hsw and the outer shaft AO.

[0069] The radial middle part of the common sub-housing partition Hsw has a carrier first support portion S1 in the form of an annular protrusion in the axial direction A towards the first planetary gear set PGS1, and the carrier of the first planetary gear set PGS1 can be connected to a bearing sleeved on the outer periphery of the carrier first support portion S1 to be supported. It should be understood that the carrier first support portion S1 can also be other forms of support structures, for example, the carrier first support portion S1 can not be a complete annular shape, for example, it can be a plurality of concentric arcs, for example, the carrier first support portion S1 is formed by the radial middle part of the common sub-housing partition Hsw being concave in the axial direction A towards the first planetary gear set PGS1, and the carrier of the first planetary gear set PGS1 is connected to a bearing sleeved on the inner periphery of the carrier first support portion S1 to be supported, and the shape of the carrier first support portion S1 is not limited in the present application.

[0070] The inner support disc Hi is located between the common sub-housing Hs and the gear box sub-housing Hg in the axial direction A, and is used to support the carrier of the first planetary gear set PGS1 and the carrier of the second planetary gear set PGS2.

[0071] The side of the inner support disc Hi facing the first planetary gear set PGS1 is provided with a carrier second support portion S2. A bearing is arranged at the carrier second support portion S2 to support the end of the carrier of the first planetary gear set PGS1 connected to the sun gear of the second planetary gear set PGS2.

[0072] The side of the inner support disc Hi facing the second planetary gear set PGS2 is provided with a carrier third support portion S3, and a bearing is arranged at the carrier third support portion S3 to support the carrier of the second planetary gear set PGS2.

[0073] Gearbox sub-housing Hg is a cylinder with one open end, which is used to accommodate the second planetary gear set PGS2 and the differential D. The open end of the gearbox sub-housing Hg is connected to the inner support plate Hi, and the closed end of the gearbox sub-housing Hg away from the inner support plate Hi is provided with an opening, which is provided with a bearing for supporting the differential housing, and the second half shaft A2 extends out of the gearbox sub-housing Hg through the opening.

[0074] Next, the working mode of the electric bridge driving system to realize two-gear shifting according to the embodiment is introduced.

[0075] (i) The first clutch C1 is engaged, and the second clutch C2 is disengaged

[0076] Referring to Figure 3 , the first clutch C1 is in the engaged state, and the second clutch C2 is in the disengaged state.

[0077] At this time, the ring gear of the first planetary gear set PGS1 is fixed, the sun gear of the first planetary gear set PGS1 inputs power, and the planet carrier of the first planetary gear set PGS1 outputs power. The sun gear of the second planetary gear set PGS2 inputs power, and the planet carrier of the second planetary gear set PGS2 outputs power.

[0078] The sun gear of the first planetary gear set PGS1 does not directly transmit torque to the sun gear of the second planetary gear set PGS2.

[0079] The torque transmission path is: motor M, sun gear of the first planetary gear set PGS1, planetary gear of the first planetary gear set PGS1, planet carrier of the first planetary gear set PGS1, sun gear of the second planetary gear set PGS2, planetary gear of the second planetary gear set PGS2, planet carrier of the second planetary gear set PGS2 to differential D.

[0080] (ii) The first clutch C1 is disengaged, and the second clutch C2 is engaged

[0081] Referring to Figure 4 , the first clutch C1 is in the disengaged state, and the second clutch C2 is in the engaged state.

[0082] At this time, the ring gear, the sun gear and the planet carrier of the first planetary gear set PGS1 are not fixed, and there is no effective torque transmission inside the first planetary gear set PGS1. While the sun gear of the first planetary gear set PGS1 and the sun gear of the second planetary gear set PGS2 are torsionally connected.

[0083] The torque transmission path is in the order of: the electric motor M, the sun gear of the first planetary gear set PGS1, the sun gear of the second planetary gear set PGS2, the planet gears of the second planetary gear set PGS2, the carrier of the second planetary gear set PGS2 to the differential D.

[0084] (Second Embodiment)

[0085] Next, the electric bridge drive system according to the second embodiment of the present application will be described. Figure 5 Next, the electric bridge drive system according to the second embodiment of the present application will be described.

[0086] The second embodiment is a modification of the first embodiment. The second embodiment differs from the first embodiment mainly in the structure of the housing.

[0087] In the present embodiment, the housing comprises in the order along the axial direction A: a detachable motor end cover Hem, a motor sub-housing Hm, a gear box sub-housing Hg2 and a gear box end cover Heg. The motor end cover Hem and the motor sub-housing Hm are connected along the axial direction A, for example by bolts. The motor sub-housing Hm and the gear box sub-housing Hg2 are connected along the axial direction A, for example by bolts. The gear box sub-housing Hg2 and the gear box end cover Heg are connected along the axial direction A, for example by bolts.

[0088] The motor sub-housing Hm is configured to house the electric motor M. The gear box sub-housing Hg2 is configured to house the first planetary gear set PGS1 and the second planetary gear set PGS2. The gear box end cover Heg is configured to house the differential D.

[0089] The motor sub-housing Hm is in the shape of a cylinder with one open end. The open end of the motor sub-housing Hm is connected to the motor end cover Hem. The end of the motor sub-housing Hm distal to the motor end cover Hem is provided with a motor sub-housing barrier Hmw so that the end constitutes a closed end.

[0090] The motor sub-housing barrier Hmw provides support for the outer shaft AO and the carrier of the first planetary gear set PGS1. The motor sub-housing barrier Hmw is provided with an opening in the middle, and the opening is provided with a bearing for supporting the outer shaft AO. The radially middle part of the motor sub-housing barrier Hmw has an annular carrier first support portion S1 protruding in the axial direction A towards the first planetary gear set PGS1, and the carrier of the first planetary gear set PGS1 can be connected to a bearing provided around the outer circumference of the carrier first support portion S1 so as to be supported. It should be understood that the carrier first support portion S1 can also be other shaped support structures.

[0091] The gear box sub-housing Hg2 is in the shape of a cylinder with both ends open. The axial middle part of the gear box sub-housing Hg2 is provided with a gear box sub-housing partition Hgw, and the first planetary gear set PGS1 and the second planetary gear set PGS2 are arranged on the axial two sides of the gear box sub-housing partition Hgw respectively. The gear box sub-housing partition Hgw is used to support the planet carrier of the first planetary gear set PGS1 and the planet carrier of the second planetary gear set PGS2.

[0092] The side of the gear box sub-housing partition Hgw facing the first planetary gear set PGS1 is provided with a planet carrier second support part S2. A bearing is arranged at the planet carrier second support part S2, which is used to support the end of the planet carrier of the first planetary gear set PGS1 connected to the sun gear of the second planetary gear set PGS2.

[0093] The side of the gear box sub-housing partition Hgw facing the second planetary gear set PGS2 is provided with a planet carrier third support part S3, and a bearing is arranged at the planet carrier third support part S3, which is used to support the planet carrier of the second planetary gear set PGS2.

[0094] The gear box end cover Heg is in the shape of a cylinder with one end open. The open end of the gear box end cover Heg is connected to the gear box sub-housing Hg2, and the closed end of the gear box end cover Heg away from the gear box sub-housing Hg2 is provided with an opening, and a bearing for supporting the differential housing is arranged at the opening, and the second half shaft A2 extends out of the gear box sub-housing Hg through the opening.

[0095] The present application has at least one of the following advantages:

[0096] (i) The output shaft of the motor M simultaneously constitutes the input shaft (i.e. the outer shaft AO) of the gear box, which reduces the number of shafts in the electric axle drive system.

[0097] (ii) The inner support disc Hi and the shared sub-housing partition Hsw in the first embodiment and the motor sub-housing partition Hmw and the gear box sub-housing partition Hgw in the second embodiment all play a role in supporting the first planetary gear set PGS1 and the second planetary gear set PGS2, which makes the vehicle have better performance in NVH (Noise, Vibration, Harshness, i.e. noise, vibration and harshness).

[0098] (iii) The electric axle drive system according to the present application includes two planetary gear sets, which makes the electric axle drive system have a higher transmission ratio, and a high transmission ratio requires a low output torque of the motor M, which saves the cost of the system.

[0099] (iv) The housing is composed of several sub-components, which are simple in structure and convenient to connect, for example, a smaller number of bolts can be used for connection, which is low in cost and high in reliability.

[0100] (v) The system structure is compact, and installation space inside the vehicle is saved. For example, the clutches (first clutch C1 and second clutch C2) and the planetary gear set (especially the first planetary gear set PGS1) are arranged in parallel in the axial direction, the axial space is fully utilized, and the axial dimension of the system is reduced.

[0101] (vi) The installation and control of the first clutch C1 and the second clutch C2 are independent of each other and do not affect each other. Compared with a double clutch integrated in one module, the two clutch structures according to the present application are simple and convenient to control.

[0102] (v) In the present application, the clutch is connected to the housing or the gear, so that part of the elements of the clutch can be integrated in the housing or the gear connected thereto, thereby reducing the number of parts and the cost.

[0103] (vi) According to the present application, the outer shaft AO can be supported by the housing, instead of only relying on the support of the first half shaft A1 located in the inner cavity thereof, so that the position accuracy requirements of the first half shaft A1 and the outer shaft AO are low.

[0104] Of course, the present application is not limited to the above-mentioned embodiments, and those skilled in the art can make various modifications to the above-mentioned embodiments of the present application under the teaching of the present application without departing from the scope of the present application. For example, although the first clutch C1 and the second clutch C2 shown in the drawings are both multi-plate clutches with multiple friction plates, the present application does not limit the number of clutch friction plates.

Claims

1. A two-speed electric axle drive system, comprising a housing, a motor (M), an outer shaft (AO), a first planetary gear set (PGS1), a second planetary gear set (PGS2), a first clutch (C1), a second clutch (C2), and a differential (D), wherein, The outer shaft (AO) is connected to the rotor of the motor (M) in a manner that prevents relative rotation. The outer shaft (AO) has a hollow inner cavity that extends axially. The first half-shaft (A1), which serves as an output half-shaft of the differential (D), passes through the inner cavity of the outer shaft (AO). The sun gear of the first planetary gear set (PGS1) is connected to the outer shaft (AO) in a way that prevents relative rotation. The ring gear of the first planetary gear set (PGS1) is connected to the housing via the first clutch (C1). The planet carrier of the first planetary gear set (PGS1) and the sun gear of the second planetary gear set (PGS2) are connected in a manner that prevents them from rotating relative to each other. The sun gear of the second planetary gear set (PGS2) is connected to the sun gear of the first planetary gear set (PGS1) via the second clutch (C2). The planet carrier of the second planetary gear set (PGS2) is connected to the differential housing of the differential (D) in a manner that prevents relative rotation. The ring gear of the second planetary gear set (PGS2) is connected to the housing in a way that prevents relative rotation.

2. The bridge drive system according to claim 1, characterized in that, When the first clutch (C1) is engaged and the second clutch (C2) is disengaged, the electric axle drive system is in one gear; when the first clutch (C1) is disengaged and the second clutch (C2) is engaged, the electric axle drive system is in another gear.

3. The bridge drive system according to claim 1, characterized in that, The first clutch (C1) and the first planetary gear set (PGS1) at least partially overlap in the axial direction.

4. The bridge drive system according to claim 1, characterized in that, The inner hub of the first clutch (C1) is connected to the ring gear of the first planetary gear set (PGS1), and the outer hub of the first clutch (C1) is connected to the housing, and / or The inner hub of the second clutch (C2) is connected to the sun gear of the second planetary gear set (PGS2), and the outer hub of the second clutch (C2) is connected to the sun gear of the first planetary gear set (PGS1).

5. The bridge drive system according to claim 1, characterized in that, The housing comprises, in the axial direction, a connected and detachable motor end cover (Hem), a common sub-housing (Hs), an inner support plate (Hi), and a gearbox housing (Hg). The shared sub-housing (Hs) is used to house the motor (M) and the first planetary gear set (PGS1), and the gearbox housing (Hg) is used to house the second planetary gear set (PGS2) and the differential (D). The inner support disc (Hi) provides support for the planet carrier of the first planetary gear set (PGS1) and the planet carrier of the second planetary gear set (PGS2).

6. The bridge drive system according to claim 5, characterized in that, The common sub-housing (Hs) includes a disc-shaped common sub-housing partition (Hsw) located in the middle of the common sub-housing (Hs) in the axial direction, the common sub-housing partition (Hsw) separating the motor (M) and the first planetary gear set (PGS1) in the axial direction. The outer shaft (AO) passes axially through the common sub-housing partition (Hsw), and a bearing for supporting the outer shaft (AO) is provided between the common sub-housing partition (Hsw) and the outer shaft (AO). The common sub-housing partition (Hsw) has a planet carrier first support (S1) on the side facing the first planetary gear set (PGS1), and the planet carrier first support (S1) is provided with a bearing that provides support for the planet carrier of the first planetary gear set (PGS1).

7. The bridge drive system according to claim 5, characterized in that, The inner support disk (Hi) has a second planetary carrier support (S2) on the side facing the first planetary gear set (PGS1). The second planetary carrier support (S2) is provided with a bearing that provides support for the planetary carrier of the first planetary gear set (PGS1). The inner support disk (Hi) has a third support part (S3) for the planet carrier on the side facing the second planetary gear set (PGS2), and the third support part (S3) for the planet carrier is provided with a bearing that provides support for the planet carrier of the second planetary gear set (PGS2).

8. The bridge drive system according to claim 1, characterized in that, The housing comprises, in the axial direction, a connected and detachable motor end cover (Hem), a motor sub-housing (Hm), a gearbox housing (Hg2), and a gearbox end cover (Heg). The motor sub-housing (Hm) is used to house the motor (M), the gearbox housing (Hg2) is used to house the first planetary gear set (PGS1) and the second planetary gear set (PGS2), and the gearbox end cover (Heg) is used to house the differential (D).

9. The bridge drive system according to claim 8, characterized in that, The end of the motor sub-housing (Hm) away from the motor end cover (Hem) has a disc-shaped motor sub-housing partition (Hmw) extending radially in the motor (M). The outer shaft (AO) passes axially through the motor sub-housing partition (Hmw). A bearing for supporting the outer shaft (AO) is provided between the motor sub-housing partition (Hmw) and the outer shaft (AO). The motor sub-housing partition (Hmw) has a planetary carrier first support (S1) on the side facing the first planetary gear set (PGS1), and the planetary carrier first support (S1) is provided with a bearing that provides support for the planetary carrier of the first planetary gear set (PGS1).

10. The bridge drive system according to claim 8, characterized in that, The gearbox housing (Hg2) has a disc-shaped gearbox housing partition (Hgw) extending radially at its axial center. The first planetary gear set (PGS1) and the second planetary gear set (PGS2) are located on opposite sides of the gearbox housing partition (Hgw). The gearbox housing partition (Hgw) has a second planetary carrier support (S2) on the side facing the first planetary gear set (PGS1). The second planetary carrier support (S2) is provided with a bearing that provides support for the planetary carrier of the first planetary gear set (PGS1). The gearbox housing partition (Hgw) has a third support part (S3) for the planet carrier on the side facing the second planetary gear set (PGS2), and the third support part (S3) for the planet carrier is provided with a bearing that provides support for the planet carrier of the second planetary gear set (PGS2).

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