Double-clutch device controlled by one-way oil pressure

Abstract

The invention relates to the technical field of clutches, in particular to a double-clutch device controlled by one-way oil pressure, which comprises an input shaft, a normally open input hub, a normally open clutch module, an output hub, an output shaft, a normally closed input hub, a normally closed clutch module and an output gear, the input shaft is in transmission connection with the normally-open clutch module through the normally-open input hub, the output hub is in transmission connection with the normally-open clutch module, and the output shaft is in transmission connection with the output hub. The input shaft is in transmission connection with the normally-closed clutch module through the normally-closed input hub, and the output gear is in transmission connection with the normally-closed clutch module. In a non-pressure state, the normally open clutch module is in an open state; the normally closed clutch module is in a closed state. The hydraulic system has the advantages that the two clutches are controlled by adopting a single pressure oil way, so that the hydraulic system is simpler, the number of parts is reduced, the cost is lower, the efficiency of the system is improved due to the use of the normally closed clutch, and the hydraulic system has extremely high cost economy and expansibility.

Description

Technical Field

[0001] The present invention relates to the technical field of clutches, and more particularly, to a dual clutch device controlled by a single hydraulic oil path. Background Art

[0002] At present, the commonly used disconnection device between a power source (engine or motor) and a transmission on the market is a wet dual clutch. The characteristic of this type of clutch is that two hydraulic oil paths are used to control the closing of the two clutches respectively, and finally the gear shift of the transmission is realized. The existing solution is to control the two clutches through two hydraulic oil paths respectively, which makes the structure too complex and the production cost relatively high. At the same time, both of the two clutches are of normally open design. In the non-working state, the clutches remain open. Due to the viscous effect of the lubricating oil, it will adhere to the main and driven components, thus generating a certain torque between the main and driven components, that is, drag torque. Therefore, in the non-working state, the drag torque will cause energy waste and reduce the efficiency of the system. Summary of the Invention

[0003] The technical problem to be solved by the present invention is that both of the existing two clutches are of normally open design, resulting in low system efficiency. To overcome the above defects of the prior art, the present invention provides a solution in which one of the clutches is changed from a normally open design to a normally closed design, reducing the drag torque in the non-working state, reducing energy loss, improving the efficiency of the system, and having extremely high cost economy and expandability.

[0004] To achieve the purpose of the present invention, the following technical solutions are adopted: A dual clutch device controlled by single-channel hydraulic pressure, comprising an input shaft, a normally open input hub, a normally open clutch module, an output hub, an output shaft, a normally closed input hub, a normally closed clutch module and an output gear; the input shaft is drivingly connected to the normally open clutch module through the normally open input hub, the output hub is drivingly connected to the normally open clutch module, the output shaft is drivingly connected to the output hub, and transmits the torque of the power source to the wheel end connected to the output shaft through the normally open clutch module; the input shaft is drivingly connected to the normally closed clutch module through the normally closed input hub, the output gear is drivingly connected to the normally closed clutch module, and transmits the torque of the power source to the wheel end connected to the output gear through the normally closed clutch module; in the state without hydraulic pressure, the normally open clutch module is in an open state; the normally closed clutch module is in a closed state; in the pressurized state; the normally open clutch module changes to a closed state; the normally closed clutch module changes to an open state. This device can control the normally open clutch module and the normally closed clutch module to perform torque transmission through the input shaft, reduce the number of parts, make the device structure more concise, lower the cost, and at the same time change the original normally open clutch structure on one side to a normally closed clutch structure, which can reduce the drag torque generated in the non-working state, reduce energy consumption, improve the efficiency of the system, and has extremely high cost economy and expandability.

[0005] Preferably, the normally closed clutch module includes a normally closed inner housing, a normally closed outer housing, a normally closed friction pair and a disc spring; the normally closed inner housing is fixedly connected to the normally closed input hub, the normally closed outer housing is fixedly connected to the output gear, and a normally closed clutch cavity is formed between the normally closed inner housing and the normally closed outer housing; the normally closed friction pair is located in the normally closed clutch cavity, and the normally closed friction pair includes a plurality of normally closed partition plates and normally closed friction plates arranged axially and staggered with each other; several normally closed partition plates are connected to the normally closed inner housing, and several normally closed friction plates are axially movably connected to the normally closed outer housing; the disc spring is axially arranged on the normally closed outer housing, and one end of the disc spring abuts against the normally closed friction plate, and the other end of the disc spring abuts against the normally closed outer housing. Under the action of the disc spring, the normally closed partition plate and the normally closed friction plate are in a normally closed state. By the action of the disc spring, the normally closed partition plate and the normally open friction plate in the non-working state are in a normally closed state, so as to reduce the oil film formed between the normally closed partition plate and the normally open friction plate due to the viscosity of the lubricating oil in the open state, and further reduce the drag torque generated by the shear force of the oil film, reduce the energy consumption during non-operation, and improve the efficiency of the overall system.

[0006] Preferably, both axial ends of the normally-closed friction pair are normally-closed friction plates. The normally-closed friction plates at both ends are normally-closed single-sided friction plates, and the friction surfaces are arranged on the inner sides. The remaining normally-closed friction plates located in the middle part are normally-closed double-sided friction plates. Radially distributed support plates are connected to the outsides of the normally-closed single-sided friction plates at both axial ends. One end of the disc spring abuts against the support plate on the side away from the normally-open clutch module, and the other end of the disc spring abuts against the positioning circlip arranged on the inner side of the normally-closed housing. The support plates at both ends facilitate better abutting and cooperation with the disc spring. At the same time, the positioning circlip also facilitates better limiting and positioning of the disc spring, ensuring the back-and-forth switching of the clutch state.

[0007] Preferably, the normally-open clutch module includes a normally-open inner housing, a normally-open outer housing, a normally-open friction pair, and a corrugated spring. The normally-open inner housing is fixedly connected to the normally-open input hub, the normally-open outer housing is fixedly connected to the output hub, and a normally-open clutch cavity is formed between the normally-open inner housing and the normally-open outer housing. The normally-open friction pair is located in the normally-open clutch cavity, and the normally-open friction pair includes a plurality of normally-open partition plates and normally-open friction plates that are arranged axially and staggered with each other. A plurality of normally-open partition plates are connected to the normally-open inner housing, and a plurality of normally-open friction plates are axially movably connected to the normally-open outer housing. The corrugated spring is axially installed in the normally-open outer housing, and under the action of the corrugated spring, the normally-open partition plates and the normally-open friction plates are in a normally-open state. The elastic force of the corrugated spring can keep the normally-open friction plates away from the normally-open partition plates, so as to ensure that the normally-open clutch module remains in an open state without hydraulic pressure.

[0008] Preferably, both axial ends of the normally-open friction pair are normally-open friction plates. The normally-open friction plates at both ends are normally-open single-sided friction plates, and the friction surfaces are arranged on the inner sides. The remaining normally-open friction plates located in the middle part are normally-open double-sided friction plates. A limit back plate is also arranged between the normally-open single-sided friction plate at the end away from the normally-closed clutch module and the normally-open outer housing. By using single-sided friction plates at both ends of the normally-open friction pair, it is ensured that the inner side can make frictional contact with the normally-open partition plates, and at the same time, the outer side can abut and cooperate with the limit back plate to ensure normal clutch switching.

[0009] Preferably, it further includes a driving mechanism for the normally open clutch module and the normally closed clutch module. The driving mechanism includes an oil sump, a normally open driving piston, and a normally closed driving piston. The oil sump is fixedly connected to the transmission housing. The normally open driving piston and the normally closed driving piston are respectively axially movably connected to both axial sides of the oil sump. The normally open driving piston drives the engagement and disengagement of the normally open clutch module through a normally open needle roller bearing, and the normally closed driving piston drives the engagement and disengagement of the normally closed clutch module through a normally closed needle roller bearing and a pressure plate. By applying pressure, the normally open driving piston can push the normally open needle roller bearing, thereby compressing the wave spring to press the normally open separator plate and the normally open friction plate together, changing the normally open clutch module to a closed state. At the same time, the normally closed driving piston pushes the normally closed needle roller bearing and the pressure plate, compresses the disc spring, separates the normally closed separator plate and the normally closed friction plate, and changes the normally closed clutch module to an open state.

[0010] Preferably, the normally open needle roller bearing is positioned on the normally open clutch module through a normally open limit snap ring; the normally closed needle roller bearing is positioned on the normally closed clutch module through a normally closed limit snap ring. The normally open limit snap ring and the normally closed limit snap ring facilitate better limiting and positioning of the needle roller bearing and the friction plate, ensuring the friction effect.

[0011] Preferably, sealing rings are provided on the outer peripheral walls of the normally open driving piston and the normally closed driving piston. The sealing rings further ensure the sealing effect of the oil circuit.

[0012] Preferably, a first spline for driving connection with the outer peripheral wall of the input shaft is provided on the inner peripheral wall of the normally open input hub, and the torque of the power source is transmitted into the normally open clutch module through the input shaft; a second spline for driving connection with the outer peripheral wall of the input shaft is provided on the inner peripheral wall of the normally closed input hub, and the torque of the power source is transmitted into the normally closed clutch module through the input shaft. The first spline and the second spline further ensure the transmission cooperation.

[0013] Preferably, a third spline for driving cooperation with the output shaft is provided on the inner peripheral wall of the output hub; the power is transmitted to the wheel end through the normally open clutch module; a transmission member for driving cooperation with the output gear is provided on the outer peripheral wall of the output gear, and the power is transmitted to the wheel end through the normally closed clutch module. The third spline and the transmission member further ensure the transmission cooperation.

[0014] In summary, the advantages of the present invention are that the device can control the normally open clutch module and the normally closed clutch module to perform torque transmission through the input shaft, reduce the number of parts, make the device structure more concise, lower the cost. At the same time, the original normally open clutch structure on one side is changed to a normally closed clutch structure, which can reduce the drag torque generated in the non-working state, reduce energy consumption, improve the efficiency of the system, and has extremely high cost economy and expandability. Description of the Drawings

[0015] Figure 1 is a schematic structural diagram of a dual clutch device controlled by single - path hydraulic pressure according to the present invention.

[0016] Figure 2 is a schematic torque transmission diagram of a dual clutch device controlled by single - path hydraulic pressure according to the present invention.

[0017] Description of the reference numerals: 1. Input shaft; 2. Normally - open input hub; 3. Normally - open clutch module; 30. Normally - open clutch cavity; 31. Normally - open inner housing; 32. Normally - open outer housing; 33. Normally - open partition plate; 34. Normally - open friction plate; 341. Normally - open single - sided friction plate; 35. Wave spring; 36. Limit back plate; 4. Output hub; 5. Output shaft; 6. Normally - closed input hub; 7. Normally - closed clutch module; 70. Normally - closed clutch cavity; 71. Normally - closed inner housing; 72. Normally - closed outer housing; 73. Normally - closed partition plate; 74. Normally - closed friction plate; 741. Normally - closed single - sided friction plate; 75. Belleville spring; 76. Support plate; 77. Retaining circlip; 8. Output gear; 9. Driving mechanism; 91. Oil sump; 92. Normally - open driving piston; 93. Normally - closed driving piston; 94. Normally - open needle bearing; 95. Normally - closed needle bearing; 96. Pressure plate; 97. Normally - open limit retaining circlip; 98. Normally - closed limit retaining circlip; 99. Sealing ring; 11. First spline; 12. Second spline; 13. Third spline. Detailed Description of the Invention

[0018] First of all, those skilled in the art should understand that these embodiments are only used to explain the technical principles of the embodiments of the present application, and are not intended to limit the protection scope of the embodiments of the present application. Those skilled in the art can make adjustments according to needs to adapt to specific application scenarios.

[0019] In the description of the embodiments of the present application, it should be noted that unless otherwise clearly specified and limited, the terms "connected" and "coupled" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium. For those of ordinary skill in the art, the specific meanings of the above terms in the embodiments of the present application can be understood according to specific situations.

[0020] In the embodiments of the present application, unless otherwise clearly specified and limited, the first feature being "on" or "under" the second feature may be that the first and second features are in direct contact, or the first and second features are indirectly in contact through an intermediate medium. Moreover, the first feature being "above", "over" and "on top of" the second feature may be that the first feature is directly above or obliquely above the second feature, or merely indicates that the horizontal height of the first feature is higher than that of the second feature. The first feature being "under", "below" and "beneath" the second feature may be that the first feature is directly below or obliquely below the second feature, or merely indicates that the horizontal height of the first feature is less than that of the second feature.

[0021] To make the above objects, features and advantages of the present invention more obvious and understandable, the following detailed description of specific embodiments of the present invention will be given with reference to the accompanying drawings.

[0022] As Figures 1 to 2 shown, a dual clutch device controlled by single - way hydraulic pressure includes an input shaft 1, a normally - open input hub 2, a normally - open clutch module 3, an output hub 4, an output shaft 5, a normally - closed input hub 6, a normally - closed clutch module 7, and an output gear 8. The normally - open clutch module 3 and the normally - closed clutch module 7 are respectively located on the axial two sides of the input shaft 1, and the normally - open clutch module 3 and the normally - closed clutch module 7 are arranged in parallel alignment. The input shaft 1 is drivingly connected to the normally - open clutch module 3 through the normally - open input hub 2, the output hub 4 is drivingly connected to the normally - open clutch module 3, the output shaft 5 is drivingly connected to the output hub 4, and transmits the torque of the power source through the normally - open clutch module 3 to the wheel end connected to the output shaft 5. The input shaft 1 is drivingly connected to the normally - closed clutch module 7 through the normally - closed input hub 6, the output gear 8 is drivingly connected to the normally - closed clutch module 7, and transmits the torque of the power source through the normally - closed clutch module 7 to the wheel end connected to the output gear 8. In the state without hydraulic pressure, the normally - open clutch module 3 is in an open state; the normally - closed clutch module 7 is in a closed state; in the pressurized state, the normally - open clutch module 3 changes to a closed state; the normally - closed clutch module 7 changes to an open state. This device can control the normally - open clutch module 3 and the normally - closed clutch module 7 to perform torque transmission through the input shaft 1, reduce the number of parts, make the device structure more concise, lower the cost. At the same time, by changing the original normally - open clutch structure on the right side to a normally - closed clutch structure, it can reduce the drag torque generated in the non - working state, reduce energy consumption, improve the efficiency of the system, and has extremely high cost - effectiveness and expandability.

[0023] As Figure 1As shown, a first spline 11 for driving connection with the outer peripheral wall of the input shaft 1 is provided on the inner peripheral wall of the normally open input hub 2, and the torque of the power source is transmitted through the input shaft 1 into the normally open clutch module 3; a second spline 12 for driving connection with the outer peripheral wall of the input shaft 1 is provided on the inner peripheral wall of the normally closed input hub 6, and the torque of the power source is transmitted through the input shaft 1 into the normally closed clutch module 7. The driving fit is further ensured by the first spline 11 and the second spline 12. A third spline 13 for driving connection with the output shaft 5 is provided on the inner peripheral wall of the output hub 4; the power is transmitted to the wheel end through the normally open clutch module 3; a transmission member for driving connection with the output gear 8 is provided on the outer peripheral wall of the output gear 8, and the power is transmitted to the wheel end through the normally closed clutch module 7. The driving fit is further ensured by the third spline 13 and the transmission member.

[0024] As Figure 1As shown, the normally closed clutch module 7 includes a normally closed inner housing 71, a normally closed outer housing 72, a normally closed friction pair, and a disc spring 75; the normally closed inner housing 71 is fixedly connected to the normally closed input hub 6 by welding, the normally closed outer housing 72 is fixedly connected to the output gear 8 by welding, and a normally closed clutch cavity 70 for clutch conversion is formed between the normally closed inner housing 71 and the normally closed outer housing 72; the normally closed friction pair is located in the normally closed clutch cavity 70, and the normally closed friction pair includes a plurality of normally closed partition plates 73 and normally closed friction plates 74 arranged axially and staggered with each other; a plurality of normally closed partition plates 73 are connected to the normally closed inner housing 71, and a plurality of normally closed friction plates 74 are axially movably connected to the normally closed outer housing 72; the disc spring 75 is axially limited on the normally closed outer housing 72, and under the action of the disc spring 75, the normally closed partition plates 73 and the normally closed friction plates 74 are pressed against each other to be in a normally closed state. Both axial ends of the normally closed friction pair are normally closed friction plates 74, and the two normally closed friction plates 74 at both ends are normally closed single-sided friction plates 741, and the friction surfaces are arranged on the inner side, and the remaining normally closed friction plates 74 located in the middle part are normally closed double-sided friction plates. Radially distributed support plates 76 are connected to the outer sides of the normally closed single-sided friction plates 741 at both axial ends; such a setting facilitates the outer side of the normally closed single-sided friction plate 741 to be in contact and cooperation with the inner side of the support plate 76, and at the same time facilitates the normally closed double-sided friction plate to be in frictional cooperation with the normally closed partition plate 73, ensuring the friction effect. The disc spring 75 is axially telescopic on the normally closed outer housing 72, the left end of the disc spring 75 abuts against the support plate 76 on the right side, and the right end of the disc spring 75 abuts against a positioning circlip 77 arranged on the inner side of the normally closed outer housing 72. The support plates 76 at both ends can facilitate better contact and cooperation with the disc spring 75, and at the same time, the positioning circlip 77 also facilitates better limiting and positioning of the disc spring 75, ensuring the back-and-forth switching of the clutch state. Under the action of the disc spring 75, the normally closed partition plates 73 and the normally closed friction plates 74 in the non-working state are in a normally closed state, so that the oil film formed between the normally closed partition plates 73 and the normally closed friction plates 74 due to the viscosity of the lubricating oil in the open state can be reduced, and further the drag torque generated by the shear force of the oil film can be reduced, the energy consumption during non-operation can be reduced, and the efficiency of the overall system can be improved.

[0025] As Figure 1As shown in the figure, the normally open clutch module 3 includes a normally open inner housing 31, a normally open outer housing 32, a normally open friction pair, and a wave spring 35; the normally open inner housing 31 is fixedly connected to the normally open input hub 2 by welding, the normally open outer housing 32 is fixedly connected to the output hub 4 by welding, and a normally open clutch cavity 30 is formed between the normally open inner housing 31 and the normally open outer housing 32; the normally open friction pair is located in the normally open clutch cavity 30, and the normally open friction pair includes a plurality of normally open partition plates 33 and normally open friction plates 34 that are arranged axially and staggered with each other; a plurality of normally open partition plates 33 are connected to the normally open inner housing 31, and a plurality of normally open friction plates 34 are axially movably connected to the normally open outer housing 32; the wave spring 35 is axially installed in the normally open outer housing 32, and both ends of the wave spring 35 respectively abut against the normally open friction plates 34 on both sides. Under the action of the wave spring 35, the normally open partition plates 33 and the normally open friction plates 34 are in a normally open state. The elastic force of the wave spring 35 can push the normally open friction plates 34 away from the normally open partition plates 33, so as to ensure that the normally open clutch module 3 remains in an open state without hydraulic pressure. Both axial ends of the normally open friction pair are normally open friction plates 34, and the normally open friction plates 34 at both ends are both normally open single-sided friction plates 341, and the friction surfaces are arranged on the inner side, and the remaining normally open friction plates 34 located in the middle are normally open double-sided friction plates; a limit back plate 36 is also provided between the outer side surface of the normally open single-sided friction plate 341 at the end (left end) far from the normally closed clutch module 7 and the inner side surface of the normally open outer housing 32. By using the normally open single-sided friction plates 341 at both ends, it is ensured that the inner side surface of the normally open single-sided friction plate 341 can make frictional contact with the normally open partition plates 33, and at the same time, the outer side surface of the normally open single-sided friction plate 341 can make abutting cooperation with the limit back plate 36 to ensure normal clutch switching.

[0026] As Figure 1As shown in the figure, it further includes a driving mechanism 9 for the normally open clutch module 3 and the normally closed clutch module 7. The driving mechanism 9 includes an oil sump 91, a normally open driving piston 92, and a normally closed driving piston 93. The oil sump 91 is fixedly connected to the transmission housing. The normally open driving piston 92 and the normally closed driving piston 93 are respectively axially movably connected to both axial sides of the oil sump 91. The normally open driving piston 92 abuts against the normally open friction plate 34 near one end (right end) of the normally closed clutch module 7 through a normally open needle roller bearing 94. The normally closed driving piston 93 abuts against the support plate 76 near one end (left end) of the normally open clutch module 3 through a normally closed needle roller bearing 95 and a pressure plate 96. When applying hydraulic pressure, the normally open driving piston 92 can push the normally open needle roller bearing 94, thereby compressing the wave spring 35 to press the normally open separator plate 33 and the normally open friction plate 34 together, changing the normally open clutch module 3 to a closed state. At the same time, the normally closed driving piston 93 pushes the normally closed needle roller bearing 95 and the pressure plate 96, compresses the disc spring 75, separates the normally closed separator plate 73 and the normally closed friction plate 74, and changes the normally closed clutch module 7 to an open state. The normally open needle roller bearing 94 is positioned on the normally open outer housing 32 through a normally open limit snap ring 97. The normally closed needle roller bearing 95 is positioned on the normally closed clutch module 7 through a normally closed limit snap ring 98. The limit snap ring facilitates better limiting and positioning of the needle roller bearing and the friction plate, ensuring the friction effect. Sealing rings 99 are provided on the outer peripheral walls of the normally open driving piston 92 and the normally closed driving piston 93. The sealing rings 99 further ensure the sealing effect of the oil circuit.

[0027] As Figure 1 and Figure 2 shown in the figure, when the device works, in the state without hydraulic pressure, on the left side, under the action of the wave spring 35, the normally open friction plate 34 and the normally open separator plate 33 are separated, and the normally open clutch module 3 is in an open state. On the right side, under the action of the disc spring 75, the normally closed separator plate 73 and the normally closed friction plate 74 are pressed together, and the normally open clutch module 3 is in a closed state. When applying hydraulic pressure, the normally open driving piston 92 in the driving mechanism 9 pushes the normally open needle roller bearing 94, so that the normally open needle roller bearing 94 presses against the normally open friction plate 34, causing the normally open friction plate 34 to axially move along with the wave spring 35, and then compressing the wave spring 35 to press the normally open separator plate 33 and the normally open friction plate 34 together, changing the normally open clutch module 3 to a closed state. At the same time, the normally closed driving piston 93 pushes the normally closed needle roller bearing 95 and the pressure plate 96, causing the pressure plate 96 to press against the support plate 76, so that the support plate 76 compresses the disc spring 75, causing the normally closed friction plate 74 to axially move, and then separating the normally closed friction plate 74 from the normally closed separator plate 73, changing the normally closed clutch module 7 to an open state.

[0028] In summary, the advantages of the present invention are as follows: the device can control the normally open clutch module 3 and the normally closed clutch module 7 to transmit torque through the input shaft 1, reducing the number of parts, making the device structure more concise, with lower costs. At the same time, converting the originally normally open clutch structure on the right side into a normally closed clutch structure can reduce the drag torque generated in the non-working state, reduce energy consumption, improve the efficiency of the system, and has extremely high cost economy and expandability.

[0029] In the description of the embodiments of the present application, it should be noted that in the description of the present application, terms such as "inside", "outside", etc., indicating directions or positional relationships are based on the directions or positional relationships shown in the drawings. This is only for the convenience of description and does not indicate or imply that the device or component must have a specific orientation, be constructed and operated in a specific orientation. Therefore, it should not be construed as a limitation of the present application.

[0030] In the description of the present application, the description referring to terms such as "one embodiment", "some embodiments", "in this embodiment", "specific examples", or "some examples", etc., means that the specific features, mechanisms, materials, or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the present application. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, mechanisms, materials, or characteristics described can be combined in any one or more embodiments or examples in a suitable manner. In addition, without contradiction, those skilled in the art can combine and combine the different embodiments or examples described in this specification and the features of different embodiments or examples.

[0031] The above is only the specific implementation manner of the present application, but the protection scope of the present application is not limited thereto. Any changes or substitutions that can be easily thought of by those skilled in the art within the technical scope disclosed in the present application should be covered by the protection scope of the present application. Therefore, the protection scope of the present application should be subject to the protection scope of the claims.

Claims

1. A dual clutch device controlled by a single oil pressure, characterized in that: The invention comprises an input shaft (1), a normally open input hub (2), a normally open clutch module (3), an output hub (4), an output shaft (5), a normally closed input hub (6), a normally closed clutch module (7) and an output gear (8); the input shaft (1) is drivingly connected to the normally open clutch module (3) via the normally open input hub (2), the output hub (4) is drivingly connected to the normally open clutch module (3), the output shaft (5) is drivingly connected to the output hub (4), and the torque of the power source is transmitted to the wheel end connected to the output shaft (5) via the normally open clutch module (3); The input shaft (1) is transmission-connected to the normally closed clutch module (7) through the normally closed input wheel hub (6); the output gear (8) is transmission-connected to the normally closed clutch module (7), and transmits the torque of the power source to the wheel end connected to the output gear (8) through the normally closed clutch module (7); in a state without hydraulic pressure, the normally open clutch module (3) is in an open state; the normally closed clutch module (7) is in a closed state; in a pressurized state, the normally open clutch module (3) is transformed into a closed state; and the normally closed clutch module (7) is transformed into an open state.

2. The dual clutch device controlled by single-circuit oil pressure according to claim 1, characterized in that: The normally closed clutch module (7) comprises a normally closed inner housing (71), a normally closed outer housing (72), a normally closed friction pair and a disc spring (75); the normally closed inner housing (71) is fixedly connected to the normally closed input hub (6), the normally closed outer housing (72) is fixedly connected to the output gear (8), and a normally closed clutch cavity (70) is formed between the normally closed inner housing (71) and the normally closed outer housing (72); the normally closed friction pair is located in the normally closed clutch cavity (70), and the normally closed friction pair is located in the normally closed clutch cavity (70). The friction pair comprises a plurality of normally closed partition plates (73) and normally closed friction plates (74) which are mutually staggered in the axial direction; the plurality of normally closed partition plates (73) are connected to the normally closed inner housing (71); the plurality of normally closed friction plates (74) are connected to the normally closed outer housing (72) in an axially movable manner; the disc spring (75) is axially arranged on the normally closed outer housing (72); and under the action of the disc spring (75), the normally closed partition plates (73) and the normally closed friction plates (74) are in a normally closed state.

3. The dual clutch device controlled by single-circuit oil pressure according to claim 2, characterized in that: Both axial ends of the normally closed friction pair are normally closed friction plates (74), and the normally closed friction plates (74) at both ends are normally closed single-sided friction plates (741), and the friction surface is arranged on the inner side, and the remaining normally closed friction plates (74) located in the middle are normally closed double-sided friction plates; the outer sides of the normally closed single-sided friction plates (741) located at both axial ends are connected to radially distributed support plates (76); one end of the disc spring (75) abuts against the support plate (76) on the side away from the normally open clutch module (3), and the other end of the disc spring (75) abuts against a positioning retaining spring (77) arranged on the inner side of the normally closed outer shell (72).

4. The dual clutch device controlled by single-circuit oil pressure according to claim 1, characterized in that: The normally open clutch module (3) comprises a normally open inner housing (31), a normally open outer housing (32), a normally open friction pair and a wave spring (35); the normally open inner housing (31) is fixedly connected to the normally open input hub (2), the normally open outer housing (32) is fixedly connected to the output hub (4), and a normally open clutch cavity (30) is formed between the normally open inner housing (31) and the normally open outer housing (32); the normally open friction pair is located in the normally open clutch cavity (30), and the normally open friction pair comprises a plurality of mutually staggered axially A normally open partition plate (33) and a normally open friction plate (34) are provided; a plurality of normally open partition plates (33) are connected to a normally open inner housing (31); a plurality of normally open friction plates (34) are connected to a normally open outer housing (32) in an axially movable manner; the wave spring (35) is axially installed in the normally open outer housing (32), and two ends of the wave spring (35) are respectively abutted against the normally open friction plates (34) on both sides, and under the action of the wave spring (35), the normally open partition plates (33) and the normally open friction plates (34) are in a normally open state.

5. The dual clutch device controlled by single-circuit oil pressure according to claim 4, characterized in that: Both axial ends of the normally open friction pair are normally open friction plates (34), the normally open friction plates (34) at both ends are normally open single-sided friction plates (341), and the friction surface is arranged on the inner side, and the remaining normally open friction plates (34) located in the middle are normally open double-sided friction plates; a limit back plate (36) is also arranged between the normally open single-sided friction plate (341) located at the end away from the normally closed clutch module (7) and the normally open outer shell (32).

6. The dual clutch device controlled by single-circuit oil pressure according to claim 1, characterized in that: It also includes a driving mechanism (9) for a normally open clutch module (3) and a normally closed clutch module (7), the driving mechanism (9) comprising an oil housing (91), a normally open driving piston (92) and a normally closed driving piston (93); the oil housing (91) is fixedly connected to a transmission housing, the normally open driving piston (92) and the normally closed driving piston (93) are respectively connected to two axial sides of the oil housing (91) in an axially movable manner, and the normally open driving piston (92) is used to drive the normally open clutch module (3) to engage or disengage via a normally open needle roller bearing (94), and the normally closed driving piston (93) is used to drive the normally closed clutch module (7) to engage or disengage via a normally closed needle roller bearing (95) and a pressure plate (96).

7. The dual clutch device controlled by single-circuit oil pressure according to claim 6, characterized in that: The normally open needle roller bearing (94) is positioned on the normally open clutch module (3) via a normally open limit spring (97); and the normally closed needle roller bearing (95) is positioned on the normally closed clutch module (7) via a normally closed limit spring (98).

8. The dual clutch device controlled by single-circuit oil pressure according to claim 6, characterized in that: Sealing rings (99) are provided on the outer peripheral walls of the normally open drive piston (92) and the normally closed drive piston (93).

9. The dual clutch device controlled by single-circuit oil pressure according to claim 1, characterized in that: The normally open input hub (2) is provided with a first spline (11) on the inner circumferential wall thereof and is transmission-connected to the outer circumferential wall of the input shaft (1), so as to transmit the torque of the power source through the input shaft (1) to the normally open clutch module (3); and the normally closed input hub (6) is provided with a second spline (12) on the inner circumferential wall thereof and is transmission-connected to the outer circumferential wall of the input shaft (1), so as to transmit the torque of the power source through the input shaft (1) to the normally closed clutch module (7).

10. The dual clutch device controlled by single-circuit oil pressure according to claim 1 or 9, characterized in that: The inner peripheral wall of the output hub (4) is provided with a third spline (13) which is in transmission cooperation with the output shaft (5); the power is transmitted to the wheel end through the normally open clutch module (3); the outer peripheral wall of the output gear (8) is provided with a transmission member which is in transmission cooperation with the output gear (8); the power is transmitted to the wheel end through the normally closed clutch module (7).

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