Modular transmission mechanism for hybrid system and hybrid system

Abstract

The application provides a modular transmission mechanism for a hybrid power system and the hybrid power system. Since the first housing and the second housing of the housing assembly of the transmission mechanism are fixed to each other via a plurality of self-punching rivets, only the first housing can be formed with mounting holes for the insertion of the self-punching rivets, and the second housing does not need to be formed with corresponding mounting holes. Thus, in the state that the housing assembly is assembled in place, the connecting structure between the first housing and the second housing does not form a passage communicating with the cavity surrounded by the housing assembly, and thus it is not necessary to set an additional sealing structure for sealing. Therefore, the structure of the modular transmission mechanism for the hybrid power system is simplified, thereby reducing the manufacturing cost. Moreover, during the assembly of the first housing and the second housing, it is not necessary to precisely align the mounting holes of different housings before assembly. Therefore, the assembly process of the transmission mechanism is simplified, thereby reducing the assembly cost.

Description

Technical Field

[0001] This application relates to the field of vehicles, and more particularly to a modular transmission mechanism for a hybrid power system for vehicles and a hybrid power system including the modular transmission mechanism. Background Technology

[0002] Currently, hybrid systems in existing vehicles have different layouts depending on the location of the electric motor. In one type of hybrid system, the engine is always driven by the motor rotor via the input shaft of the transmission mechanism, the motor rotor is controlled to be driven by the output shaft of the transmission mechanism via a clutch, and the output shaft of the transmission mechanism is driven by the input shaft of the gearbox. Thus, a hybrid system with the above structure is constructed as a hybrid system with a so-called P1 architecture.

[0003] In the aforementioned hybrid powertrain system, the transmission housing assembly typically comprises two housings fixed to each other. One housing is fixed to the stator of the motor, while the other is supported by the input shaft via bearings. Both housings have multiple mounting holes spaced apart circumferentially. For example, rivet-type fasteners are inserted into paired mounting holes to secure the two housings together. Since the cavities formed within the housing assembly may allow lubricating and cooling fluids (e.g., oil) to flow through, the mounting holes of both housings need to be sealed, resulting in a complex transmission structure and high manufacturing costs. Furthermore, the paired mounting holes require precise alignment during the assembly of the two housings, further complicating the assembly of the transmission and increasing assembly costs. Utility Model Content

[0004] This application is made in view of the aforementioned state of the prior art. One object of this application is to provide a modular transmission mechanism for a hybrid power system, whose housing assembly, while meeting sealing and assembly requirements, simplifies the structure and assembly process of the transmission mechanism and reduces manufacturing and assembly costs. Another object of this application is to provide a hybrid power system including this modular transmission mechanism, which achieves the same effects.

[0005] To achieve the above objectives, this application adopts the following technical solution.

[0006] This application provides a modular transmission mechanism for a hybrid power system, characterized in that it includes:

[0007] An electric motor, which includes a stator and a rotor;

[0008] An input shaft is used to receive torque from outside the modular transmission mechanism and is always drivenly connected to the rotor;

[0009] At least one output shaft is provided for transmitting torque to the outside of the modular transmission mechanism and is capable of being driveably connected to the input shaft.

[0010] An input bearing comprising an inner ring and an outer ring rotatable relative to each other, the inner ring being fixed to the input shaft; and

[0011] The housing assembly includes a first housing, a second housing, and a plurality of self-piercing rivets. The first housing is fixed to the stator, and the second housing is fixed to the outer ring. The first housing has a plurality of mounting holes, and each of the self-piercing rivets passes through the corresponding mounting hole and is riveted into the second housing, such that the first housing and the second housing are fixed to each other by the plurality of self-piercing rivets.

[0012] In one alternative embodiment, the first housing includes a first axial portion and a first radial portion fixed to each other.

[0013] The first axial portion is fixed to the stator, and

[0014] The first radial portion extends radially inward from one axial end of the first axial portion, and the plurality of mounting holes are formed in the first radial portion.

[0015] In another alternative embodiment, the second housing comprises a second axial portion and a second radial portion fixed to each other.

[0016] The second axial portion is fixed to the outer ring, and

[0017] The second radial portion extends radially outward from one axial end of the second axial portion, and the second radial portion abuts against the first radial portion from one axial side.

[0018] In another alternative embodiment, the second radial portion is formed with a protrusion, and the radially inner end of the first radial portion abuts against the protrusion from the radially outer side.

[0019] In another alternative embodiment, a rotor support is also included, which is fixed to the rotor and the input shaft, and a cavity is formed between the rotor support, the housing assembly and the motor, with the second radial portion closing the cavity from one axial side.

[0020] In another alternative embodiment, the self-piercing rivet includes a rivet portion that is at least partially pressed into the second housing and does not penetrate the second housing. The rivet portion is formed in an annular configuration such that a portion of the structure in the second housing fills the cavity of the rivet portion, and at least a portion of the rivet portion is formed in a gradually expanding shape.

[0021] In another alternative embodiment, the self-piercing rivet further includes a connecting portion and a flange portion, the rivet portion being fixed to one end of the connecting portion and the flange portion being fixed to the other end of the connecting portion, the connecting portion being located in the mounting hole, and the flange portion pressing against the first housing, such that the first housing is clamped between the flange portion and the second housing.

[0022] In another alternative embodiment, the at least one output shaft includes a first output shaft and a second output shaft, and the modular transmission mechanism further includes a clutch, wherein the first output shaft is controlled to drive the rotor via the clutch, and the second output shaft is always driven to drive the rotor.

[0023] In another alternative embodiment, the clutch includes an outer hub, an inner hub, and a friction clutch unit assembled together. The outer hub is always drivenly connected to the rotor, the inner hub is always drivenly connected to the first output shaft, and the friction clutch unit is located between the outer hub and the inner hub, such that the outer hub and the inner hub can be drivenly connected in a controlled manner via the friction clutch unit.

[0024] This application also provides a hybrid power system including a modular transmission mechanism for a hybrid power system as described in any of the above technical solutions.

[0025] By adopting the above technical solution, this application provides a modular transmission mechanism for a hybrid power system and a hybrid power system including the transmission mechanism. The transmission mechanism includes an assembled motor, an input shaft, at least one output shaft, an input bearing, and a housing assembly. The motor includes a stator and a rotor rotatable relative to the stator. The input shaft receives torque from an external source (e.g., an engine) and is always driveably connected to the rotor. At least one output shaft transmits torque to an external source (e.g., a transmission) of the modular transmission mechanism, and is driveably connected to the input shaft. The input bearing includes an inner ring and an outer ring rotatable relative to each other; the inner ring is mounted on the input shaft, and the outer ring is mounted on the housing assembly. Furthermore, the housing assembly includes a first housing, a second housing, and a plurality of self-piercing rivets. The first housing is fixed to the stator, and the second housing is fixed to the outer ring. The first housing has mounting holes, and each self-piercing rivet passes through a corresponding mounting hole and is riveted into the second housing, such that the first housing and the second housing are fixed to each other by the plurality of self-piercing rivets.

[0026] In this way, since the first and second housings of the housing assembly are fixed together by multiple self-piercing rivets, only the first housing needs to have mounting holes for the self-piercing rivets to be inserted. The second housing does not need to have corresponding mounting holes, and the self-piercing rivets can pass through the mounting holes and be riveted into the second housing under sufficient pressure using their own structure. Therefore, when the housing assembly is assembled, the connection structure between the first and second housings does not form a channel communicating with the cavity enclosed by the housing assembly, thus eliminating the need for an additional sealing structure. This simplifies the structure of the modular transmission mechanism for the hybrid power system, thereby reducing manufacturing costs. Furthermore, during the assembly of the first and second housings, it is not necessary to precisely align the mounting holes of the different housings as described in the prior art. This simplifies the assembly process of the transmission mechanism, thereby reducing assembly costs. Attached Figure Description

[0027] Figure 1 This is a perspective view of a modular transmission mechanism for a hybrid power system according to an embodiment of this application.

[0028] Figure 2 It shows Figure 1 A partial cross-sectional view of the transmission mechanism taken along its central axis.

[0029] Figure 3 It shows Figure 1 A three-dimensional schematic diagram of a self-piercing rivet in the housing assembly of the transmission mechanism, wherein the self-piercing rivet is in an unriveted initial state.

[0030] Figure 4 It shows Figure 1 A cross-sectional schematic diagram of a portion of the transmission mechanism, showing the self-piercing rivet in its initial, unriveted state.

[0031] Figure 5 It shows Figure 1 A cross-sectional schematic diagram of a portion of the transmission mechanism, showing the self-piercing rivet in a riveted state.

[0032] Explanation of reference numerals in the attached figures

[0033] 1. Electric motor;

[0034] 11. Stator;

[0035] 12 rotors;

[0036] 2. Input axis;

[0037] 3. First output shaft;

[0038] 4. Second output shaft;

[0039] 5. Input bearings;

[0040] 6. Housing assembly;

[0041] 61 First shell;

[0042] 611 First axial portion; 612 First radial portion; 612h Mounting hole;

[0043] 62 Second shell;

[0044] 621 Second axial portion; 622 Second radial portion; 622p Protrusion;

[0045] 63 self-piercing rivets;

[0046] 631 Riveting part; 632 Connecting part; 633 Flange part;

[0047] 7. Rotor support;

[0048] 8. Clutch;

[0049] 81 Outer hub;

[0050] 82 Inner hub;

[0051] 83 Friction clutch unit;

[0052] 9. Additional support;

[0053] A is axial; R is radial; O is the central axis. Detailed Implementation

[0054] Exemplary embodiments of this application are described below with reference to the accompanying drawings. It should be understood that these specific descriptions are for teaching those skilled in the art how to implement this application only, and are not intended to exhaustively describe all possible methods of this application, nor to limit the scope of this application.

[0055] In this application, unless otherwise specified, "axial," "radial," and "circumferential" refer to the axial, radial, and circumferential directions, respectively, of the modular transmission mechanism for the hybrid power system according to this application. "One side of the axial direction" refers to... Figure 2 , Figure 4 and Figure 5 The left side (e.g., the side where the engine is located in a hybrid system), "the other side of the axis" refers to... Figure 2 , Figure 4 and Figure 5 The right side (e.g., the side where the transmission is located in a hybrid system), "radial outer" refers to... Figure 2 , Figure 4 and Figure 5 The upper side (i.e., the side furthest from the central axis O) refers to the "radial inner side". Figure 2 , Figure 4 and Figure 5 The lower side (i.e., the side closest to the central axis O). Furthermore, in this application, one component is located on one axial side or the other axial side of another component; such a description does not exclude the possibility of axial overlap between the two components.

[0056] In this application, "transmission connection" between two components means a connection between the two components that can transmit torque, including a direct connection between the two components and an indirect connection between the two components through other structures.

[0057] The following description, in conjunction with the accompanying drawings, illustrates a modular transmission mechanism for a hybrid power system according to an embodiment of this application.

[0058] like Figure 1 and Figure 2 As shown, the modular transmission mechanism for a hybrid power system according to an embodiment of this application includes a motor 1, an input shaft 2, a first output shaft 3, a second output shaft 4, an input bearing 5, a housing assembly 6, a rotor support 7, a clutch 8, and an additional support 9, all of which are assembled together in a coaxial manner.

[0059] In this embodiment, as Figure 2 As shown, the motor 1 includes a stator 11 and a rotor 12. The rotor 12 is located radially inside the stator 11, and there is a continuous air gap between the rotor 12 and the stator 11 along the circumference. The stator 11 is fixed to the housing assembly 6. The rotor 12 is fixed to the rotor support 7 and the additional support 9, and the rotor 12 is able to rotate relative to the stator 11 in the magnetic field generated by the stator 11, thereby outputting torque.

[0060] In this embodiment, as Figure 1 and Figure 2 As shown, the input shaft 2 is primarily used to receive external torque from the modular transmission mechanism. For example, the input shaft 2 can be driven to the output shaft of the engine in a hybrid power system via a damper; for this purpose, the input shaft 2 can be formed with splines that mate with the splines of the engine's output shaft. Additionally, the input shaft 2 is always driven to the rotor 12 via the rotor support 7.

[0061] In this embodiment, as Figure 2As shown, both the first output shaft 3 and the second output shaft 4 are hollow shafts and arranged coaxially. The second output shaft 4 is fitted radially outside a portion of the structure of the first output shaft 3. The first output shaft 3 and the second output shaft 4 are mainly used to transmit torque to the outside of the modular transmission mechanism. For example, the first output shaft 3 can be driven to the input shaft 2 of the transmission in a hybrid power system. For this purpose, the first output shaft 3 can be formed with splines that engage with the spline of the input shaft 2 of the transmission. In addition, the first output shaft 3 is controlled to be driven to the rotor support 7 via the clutch 8, and the second output shaft 4 is always driven to the rotor support 7 via an additional support 9, thereby enabling both the first output shaft 3 and the second output shaft 4 to be driven to the input shaft 2.

[0062] In this embodiment, as Figure 2 As shown, to ensure smooth operation of the input shaft 2 while supported by the housing assembly 6, an input bearing 5 is disposed between the input shaft 2 and the housing assembly 6. This input bearing 5 is a ball bearing and includes an inner ring and an outer ring capable of relative rotation. The inner ring is fitted onto the input shaft 2 from the radially outer side and is fixed to it. The outer ring is mounted onto the housing assembly 6 from the radially inner side and is fixed to it. Thus, with the housing assembly 6 supporting the input shaft 2 via the input bearing 5, the input shaft 2 can operate smoothly.

[0063] In this embodiment, as Figure 1 and Figure 2 As shown, housing assembly 6 includes a first housing (which may be referred to as a stator support) 61, a second housing (which may be referred to as a bearing cover) 62, and a plurality of self-piercing rivets 63 assembled together.

[0064] like Figure 1 , Figure 2 , Figure 4 and Figure 5 As shown, the first housing 61 includes an integrally formed first axial portion 611 and a first radial portion 612. The first axial portion 611 extends linearly along the axial direction A and is fixed to the stator 11 from the radially outer side, thereby fixing the first housing 61 and the stator 11 to each other. The first radial portion 612 is connected to one axial end of the first axial portion 611 and extends linearly from the first axial portion 611 toward the radially inner side along the radial direction R. Furthermore, the first radial portion 612 has a plurality of mounting holes 612h spaced apart circumferentially along the circumference, each mounting hole 612h penetrating the first radial portion 612 along the axial direction A and through which a self-piercing rivet 63 is inserted.

[0065] like Figure 1 , Figure 2 , Figure 4 and Figure 5As shown, the second housing 62 includes an integrally formed second axial portion 621 and a second radial portion 622. The second axial portion 621 extends linearly along axial direction A and is fixed to the outer ring of the input bearing 5 from the radially outer side, thereby fixing the second housing 62 to the outer ring. The second axial portion 621 is located radially inside the first axial portion 611 and overlaps with the first axial portion 611 in axial direction A. The second radial portion 622 is connected to one axial end of the second axial portion 621 and extends linearly from the second axial portion 621 toward the radially outer side along radial direction R. When the first housing 61 and the second housing 62 are fixed together by self-piercing rivets 63, the second radial portion 622 abuts against the first radial portion 612 from the axial side. Furthermore, the second radial portion 622 is formed with a protrusion 622p that protrudes toward the other axial side relative to the surrounding structure. The inner radial end of the first radial portion 612 abuts against the protrusion 622p from the outer radial side, thereby limiting and supporting the first radial portion 612. However, the second radial portion 622 does not form a hole or groove corresponding to the mounting hole 612h of the first radial portion 612. During the riveting process of the self-piercing rivet 63, the riveting portion 631 of the self-piercing rivet 63 will be pressed into the second radial portion 622, which will be further explained later.

[0066] like Figure 2 and Figure 5 As shown, each self-piercing rivet 63 passes through a corresponding mounting hole 612h in the first radial portion 612 and is riveted into the second housing 62, such that the first housing 61 and the second housing 62 are fixed together by a plurality of self-piercing rivets 63. Figures 3 to 5 As shown, each self-piercing rivet 63 includes an integrally formed riveting portion 631, a connecting portion 632, and a flange portion 633, with the riveting portion 631 and the flange portion 633 located at the two ends of the connecting portion 632, respectively.

[0067] The riveting portion 631 is formed into a ring structure, thereby forming an inner cavity on the inner side of the riveting portion 631. For example... Figure 2 and Figure 5As shown, the riveting portion 631 is pressed into the second radial portion 622 of the second housing 62 but does not pass through it. Thus, a portion of the structure (partial material) in the second radial portion 622 of the second housing 62 is compressed and filled into the inner cavity of the annular structure of the riveting portion 631. Furthermore, a portion of the riveting portion 631, including its free end away from the flange portion 633, is formed with an outer diameter that gradually widens towards the axial side. However, the riveting portion 631 does not form a through hole in the second radial portion 622. This configuration is the result of the combined effect of the pressure on the self-piercing rivet 63 and the shape of the die pressing against the second radial portion 622 from the axial side during the riveting process. The portion of the second radial portion 622 that mates with the die is formed in a shape that protrudes towards the axial side.

[0068] The connecting part 632 is formed as a solid cylindrical structure. In the riveted state after being riveted with the self-piercing rivet 63, such as... Figure 2 and Figure 5 As shown, the connecting part 632 is basically located within the mounting hole 612h. In the initial state where the self-piercing rivet 63 is not riveted, as... Figure 3 As shown, the outer diameter of the connecting part 632 is the same as the outer diameter of the riveting part 631, and is slightly smaller than the diameter of the mounting hole 612h of the first radial part 612.

[0069] The outer diameter of the flange portion 633 is larger than the outer diameter of the connecting portion 632. In the riveted state after the self-piercing rivet 63 has been used, such as... Figure 2 and Figure 5 As shown, the flange portion 633 is located on the other side of the first radial portion 612 along the axial direction, and the flange portion 633 presses against the first radial portion 612, such that the first radial portion 612 is sandwiched between the flange portion 633 and the second housing 62.

[0070] It is understandable that, in order for the self-piercing rivet 63 to be smoothly pressed into the second radial portion 622 during the riveting process, the self-piercing rivet 63 may have the following characteristics: the free end of the riveting portion 631 may form a tapered (or pointed) structure; the riveting portion 631 has an internal cavity for accommodating a portion of the structure of the second radial portion 622; and the material of the self-piercing rivet 63 is configured such that even if the self-piercing rivet 63 is inserted from... Figure 3 and Figure 4 The shape shown in the initial state transforms into Figure 2 and Figure 5 After the shape shown in the riveting state is achieved, the structure of the self-piercing rivet 63 will not break.

[0071] In this embodiment, as Figure 2As shown, the rotor support 7 supports the rotor 12 radially inward while transmitting torque from the rotor 12. The rotor support 7 is fixedly connected to the rotor 12, for example, by an interference fit and is located radially inward of the rotor 12. The radially inward end of the rotor support 7 is always drivenly connected to the input shaft 2, thereby ensuring that the input shaft 2 is always drivenly connected to the rotor 12 via the rotor support 7. In addition, a cavity is formed between the rotor support 7, the housing assembly 6, and the motor 1. A second radial portion 622 closes the cavity from one axial side, so that even if fluid is present in the cavity, the fluid will be blocked by the second radial portion 622 and will not flow out of the cavity axially.

[0072] In this embodiment, as Figure 2 As shown, the clutch 8 includes an outer hub 81, an inner hub 82, and a friction clutch unit 83 assembled together. The friction clutch unit 83 includes multiple pressure plates and multiple friction plates respectively mounted on the outer hub 81 and the inner hub 82. Under the action of an actuator, such as a piston, the multiple pressure plates can engage with the multiple friction plates, thereby achieving a transmission connection between the outer hub 81 and the inner hub 82; after the actuator is released, the multiple pressure plates and multiple friction plates separate, thereby disengaging the transmission connection between the outer hub 81 and the inner hub 82. Furthermore, the outer hub 81 is always transmissionally connected to the rotor support 7, and the inner hub 82 is always transmissionally connected to the first output shaft 3, thereby achieving a controlled transmission connection between the first output shaft 3 and the rotor 12 via the clutch 8. When the clutch 8 is engaged, the first output shaft 3 is transmissionally connected to the rotor 12, and then to the input shaft 2; when the clutch 8 is disengaged, the first output shaft 3 is disengaged from the rotor 12, and then from the input shaft 2.

[0073] In this embodiment, as Figure 2 As shown, the radially outer end of the additional bracket 9 can be fixed together with the rotor bracket 7, and the radially inner end of the additional bracket 9 is fixed together with the second output shaft 4, so that the second output shaft 4 can be always connected to the rotor 12 via the additional bracket 9.

[0074] Thus, since the first housing 61 and the second housing 62 of the housing assembly 6 are fixed to each other by a plurality of self-piercing rivets 63, only the first housing 61 has a mounting hole 612h for inserting the self-piercing rivets 63, and the second housing 62 does not need to have a corresponding mounting hole. Therefore, when the housing assembly 6 is assembled, the connection structure between the first housing 61 and the second housing 62 does not form a channel communicating with the cavity surrounded by the housing assembly 6, and therefore no additional sealing structure is needed for sealing. This simplifies the structure of the transmission mechanism, thereby reducing manufacturing costs. Furthermore, during the assembly of the first housing 61 and the second housing 62, it is not necessary to precisely align the paired mounting holes as described in the prior art. This simplifies the assembly process of the transmission mechanism, thereby reducing assembly costs.

[0075] This application also provides a hybrid power system comprising a modular transmission mechanism, an engine, and a transmission having the above-described structure. The output shaft of the engine can be driven to the input shaft of the transmission via the modular transmission mechanism. The transmission may include multiple meshing gears. Thus, the hybrid power system can achieve typical operating modes, such as pure engine drive mode, pure electric motor drive mode, and hybrid drive mode.

[0076] It should be understood that the above embodiments are merely exemplary and are not intended to limit this application. Those skilled in the art can make various modifications and changes to the above embodiments under the teachings of this application without departing from the scope of this application.

[0077] i. It is understood that in the modular transmission mechanism for the hybrid power system of this application, a cooling jacket can be provided between the first axial portion 611 and the stator 11, forming a flow channel for coolant (e.g., water) between the cooling jacket and the first axial portion 611, so that the cooling jacket can cool the stator 11 of the motor 1. In addition, the cooling jacket can also provide support for the stator 11.

[0078] ii. It is understood that in the modular transmission mechanism for hybrid power systems according to this application, the number of output shafts is not limited to the two described in the above specific embodiments, and only one output shaft may be provided.

[0079] iii. It is understood that the operating modes of the hybrid power system according to this application are not limited to the operating modes described in the above embodiments, but may also include other operating modes.

[0080] iv. It is understood that in the modular transmission mechanism for the hybrid power system according to this application, in addition to the bearing between the housing assembly 6 and the input shaft 2, bearings can also be provided between other two components that are capable of relative rotation. Moreover, various sealing structures can be provided at the desired locations.

Claims

1. A modular transmission mechanism for a hybrid power system, characterized in that, include: An electric motor, which includes a stator and a rotor; An input shaft is used to receive torque from outside the modular transmission mechanism and is always drivenly connected to the rotor; At least one output shaft is provided for transmitting torque to the outside of the modular transmission mechanism and is capable of being driveably connected to the input shaft. An input bearing includes an inner ring and an outer ring that are rotatable relative to each other, the inner ring being fixed to the input shaft; as well as The housing assembly includes a first housing, a second housing, and a plurality of self-piercing rivets. The first housing is fixed to the stator, and the second housing is fixed to the outer ring. The first housing has a plurality of mounting holes, and each of the self-piercing rivets passes through the corresponding mounting hole and is riveted into the second housing, such that the first housing and the second housing are fixed to each other by the plurality of self-piercing rivets.

2. The modular transmission mechanism for a hybrid power system according to claim 1, characterized in that, The first housing includes a first axial portion and a first radial portion fixed to each other. The first axial portion is fixed to the stator, and The first radial portion extends radially inward from one axial end of the first axial portion, and the plurality of mounting holes are formed in the first radial portion.

3. The modular transmission mechanism for a hybrid power system according to claim 2, characterized in that, The second housing includes a second axial portion and a second radial portion that are fixed to each other. The second axial portion is fixed to the outer ring, and The second radial portion extends radially outward from one axial end of the second axial portion, and the second radial portion abuts against the first radial portion from one axial side.

4. The modular transmission mechanism for a hybrid power system according to claim 3, characterized in that, The second radial portion has a protrusion, and the radially inner end of the first radial portion abuts against the protrusion from the radially outer side.

5. The modular transmission mechanism for a hybrid power system according to claim 3, characterized in that, It also includes a rotor support fixed to the rotor and the input shaft, forming a cavity between the rotor support, the housing assembly and the motor, and the second radial portion closing the cavity from one axial side.

6. The modular transmission mechanism for a hybrid power system according to any one of claims 1 to 5, characterized in that, The self-piercing rivet includes a rivet portion that is at least partially pressed into the second housing and does not penetrate the second housing. The rivet portion is formed in an annular structure such that a portion of the structure in the second housing fills the cavity of the rivet portion, and at least a portion of the rivet portion is formed in a gradually expanding shape.

7. The modular transmission mechanism for a hybrid power system according to claim 6, characterized in that, The self-piercing rivet also includes a connecting portion and a flange portion. The riveting portion is fixed to one end of the connecting portion, and the flange portion is fixed to the other end of the connecting portion. The connecting portion is located in the mounting hole, and the flange portion presses against the first housing, so that the first housing is clamped between the flange portion and the second housing.

8. The modular transmission mechanism for a hybrid power system according to any one of claims 1 to 5, characterized in that, The at least one output shaft includes a first output shaft and a second output shaft, and the modular transmission mechanism further includes a clutch, wherein the first output shaft is controlled to drive the rotor via the clutch, and the second output shaft is always driven to drive the rotor.

9. The modular transmission mechanism for a hybrid power system according to claim 8, characterized in that, The clutch includes an outer hub, an inner hub, and a friction clutch unit assembled together. The outer hub is always drivenly connected to the rotor, and the inner hub is always drivenly connected to the first output shaft. The friction clutch unit is located between the outer hub and the inner hub, so that the outer hub and the inner hub can be drivenly connected in a controlled manner via the friction clutch unit.

10. A hybrid power system, characterized in that, The modular transmission mechanism for a hybrid power system includes any one of claims 1 to 9.

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