Four-wheel-drive vehicle torque management system and method and automobile

Abstract

The invention relates to the technical field of automobile transmission, in particular to a four-wheel drive vehicle torque management system and method and an automobile. The system comprises a multi-plate clutch, a torque synchronizing mechanism and a hydraulic control loop; the torque synchronizing mechanism comprises a synchronizing mechanism gear sleeve, an outer input shaft gear hub and an inner output shaft gear hub. The outer input shaft gear hub is connected with an outer rotating pair of the multi-piece clutch, and the inner output shaft gear hub is connected with an inner rotating pair of the multi-piece clutch. And the hydraulic control loop is configured to control the movement of the synchronizing mechanism gear sleeve, so that the synchronizing mechanism gear sleeve is simultaneously connected with the outer input shaft gear hub and the inner output shaft gear hub, or the synchronizing mechanism gear sleeve is only connected with the outer rotating pair. According to the four-wheel-drive vehicle torque management system, the torque transmission upper limit is effectively improved, the abrasion and overheating risks of the multi-plate clutch are reduced, and the driving experience is improved.

Description

Technical Field

[0001] The present invention relates to the field of automobile transmission technology, and in particular to a four-wheel drive vehicle torque management system, method and automobile. Background Art

[0002] As people's requirements for vehicle performance continue to increase, especially in terms of passing ability and stability under harsh road conditions, traditional two-wheel drive can no longer meet all needs. Therefore, four-wheel drive systems have been widely used in modern vehicles.

[0003] Four-wheel drive systems are usually divided into full-time four-wheel drive, timely four-wheel drive and part-time four-wheel drive. Among them, the timely four-wheel drive system often uses a multi-plate clutch torque coupler to achieve automatic switching between two-wheel drive and four-wheel drive. The multi-plate clutch torque coupler has a fast response speed and can quickly adjust the power distribution. It can also dynamically adjust the power distribution of the front and rear axles according to the road conditions, improving the stability and controllability of the vehicle in complex road conditions such as slippery, ice and snow.

[0004] However, the existing multi-plate clutch has the following problems:

[0005] (1) The upper limit of torque transmission is low: Due to structural and material reasons, the maximum torque transmission capacity of the multi-plate clutch torque coupler is limited, that is, the maximum torque transmitted from the power system to other shafts is limited by the clutch performance, and usually cannot achieve 100% torque transmission.

[0006] (2) Overheating under high load: Under long-term and frequent conditions of high torque transmission, especially when wheel-end impacts occur frequently in off-road scenarios, multi-plate clutches are prone to unexpected slippage, causing the disc to overheat, resulting in limited functionality, reduced performance, and even friction plate burnout and damage.

[0007] (3) In the part-time four-wheel drive system, the traditional central hard differential lock can transmit 100% torque, but it needs to be manually operated by the driver, and the coupling parts are engaged due to the transmission of torque, and the vehicle needs to be parked or shifted into neutral to complete the switch. In the face of comprehensive working conditions, it cannot be automatically and timely triggered and closed, and frequent parking and switching are required. Summary of the invention

[0008] The present invention aims to solve at least one of the technical problems in the above-mentioned technology to a certain extent, and proposes a torque management system for a four-wheel drive vehicle, comprising:

[0009] Multi-plate clutch, torque synchronization mechanism and hydraulic control circuit; among them,

[0010] The torque synchronization mechanism comprises:

[0011] Synchronous mechanism gear sleeve, outer input shaft gear hub and inner output shaft gear hub;

[0012] The outer input shaft gear hub is connected to the outer rotating pair of the multi-plate clutch, and the inner output shaft gear hub is connected to the inner rotating pair of the multi-plate clutch;

[0013] The hydraulic control circuit is configured to control the movement of the synchronous mechanism sleeve so that the synchronous mechanism sleeve is connected to the outer input shaft gear hub and the inner output shaft gear hub at the same time, or the synchronous mechanism sleeve is connected only to the outer rotary pair.

[0014] Furthermore, the central axis of the outer input shaft gear hub is the same as that of the inner output shaft gear hub, and the outer input shaft gear hub and the inner output shaft gear hub are connected via an end face bearing.

[0015] Furthermore, the hydraulic control circuit comprises:

[0016] Liquid pump, reversing valve and hydraulic actuator; among them,

[0017] The hydraulic actuator is connected to the synchronous mechanism gear sleeve;

[0018] The hydraulic actuator is also connected to the liquid pump via the reversing valve;

[0019] The flow direction of the fluid path of the hydraulic actuator when the reversing valve is in the first working position is opposite to the flow direction of the fluid path when the reversing valve is in the second working position.

[0020] Furthermore, the liquid outlet of the liquid pump is also connected to the hydraulic chamber of the multi-plate clutch;

[0021] The hydraulic control circuit further includes: a first one-way valve disposed between the liquid outlet of the liquid pump and the liquid inlet of the reversing valve, a second one-way valve disposed between the liquid outlet of the liquid pump and the liquid inlet of the hydraulic chamber, and a pressure relay;

[0022] The pressure relay is configured as:

[0023] When it is detected that the hydraulic pressure value of the hydraulic control circuit is greater than a threshold value, a signal is transmitted to the vehicle ECU so that it controls the reversing valve to switch the working position.

[0024] Furthermore, the vehicle ECU is also configured to: when the synchronous mechanism gear sleeve is only connected to the outer rotation pair, adjust the rotation speed of the liquid pump according to the speed difference between the front and rear axles of the vehicle.

[0025] Furthermore, the hydraulic control circuit further includes: a pressure accumulator arranged between the oil outlet of the second one-way valve and the liquid inlet of the hydraulic chamber.

[0026] Furthermore, the reversing valve is a three-position four-way reversing valve.

[0027] Further, the system also includes: a manual control switch;

[0028] The manual control switch is configured as:

[0029] In response to the user's operation, the movement of the synchronous mechanism gear sleeve is controlled so that the synchronous mechanism gear sleeve is connected to the outer input shaft gear hub and the inner output shaft gear hub at the same time, or the synchronous mechanism gear sleeve is only connected to the outer rotary pair.

[0030] The present application also proposes a torque management method for a four-wheel drive vehicle, comprising:

[0031] Four-wheel drive vehicle torque management is performed based on the above-mentioned four-wheel drive vehicle torque management system.

[0032] The present application also proposes a car, wherein the car is equipped with the above-mentioned four-wheel drive vehicle torque management system.

[0033] Compared with the prior art, the present invention has the following beneficial effects:

[0034] 1. The four-wheel drive vehicle torque management system provided in this application can significantly enhance the off-road capability of the vehicle: the torque synchronization mechanism is automatically switched on demand, and the theoretical upper limit of the transmission torque reaches 100%, which can significantly improve the maximum torque transmission capacity and enhance the vehicle's passability in complex terrain, especially on low-adhesion roads such as mud and snow.

[0035] 2. In the four-wheel drive vehicle torque management system provided in this application, when high torque transmission is required, the torque synchronization mechanism can automatically intervene to reduce the risk of overheating of the hydraulic clutch.

[0036] 3. The four-wheel drive vehicle torque management system provided in this application can enhance the driving experience: through this system, the driver can also select the appropriate driving mode according to his own needs or current road conditions, so as to obtain a better driving experience.

[0037] 4. In the four-wheel drive vehicle torque management system provided in this application, high torque usage scenarios are implemented by the torque synchronization mechanism, which optimizes the working conditions of the clutch, reduces wear caused by excessive use, and extends the overall life of the system.

[0038] 5. The four-wheel drive vehicle torque management system provided in this application can implement a variety of protection mechanisms, such as overheating protection, fault detection, etc., to ensure the safety and durability of the system, improve the safety performance of the vehicle, and ensure the safety of life and property of the driver.

[0039] 6. The four-wheel drive vehicle torque management system provided in this application adopts a combination of a multi-plate clutch and a mechanical synchronizer. The existence of the torque synchronization mechanism makes the process from flexible connection to hard connection smoother, thereby improving driving comfort.

[0040] 7. The four-wheel drive vehicle torque management system provided in this application does not require stopping or parking when automatically engaging the synchronization mechanism. By pressurizing the hydraulic clutch, the input and output shafts are made to have the same speed, and then the torque synchronization mechanism is directly engaged, thereby improving the convenience of operation.

[0041] Other features and advantages of the present invention will be described in the following description, and partly become apparent from the description, or be understood by practicing the present invention. The purpose and other advantages of the present invention can be realized and obtained by the structures particularly pointed out in the written description and the accompanying drawings. The technical scheme of the present invention is further described below through the accompanying drawings and embodiments. BRIEF DESCRIPTION OF THE DRAWINGS

[0042] The accompanying drawings are used to provide a further understanding of the present invention and constitute a part of the specification. Together with the embodiments of the present invention, they are used to explain the present invention and do not constitute a limitation of the present invention. In the accompanying drawings:

[0043] Figure 1 A schematic diagram of a torque management system for a four-wheel drive vehicle according to an embodiment;

[0044] Figure 2 A schematic diagram of a flexible transmission working condition of a multi-plate clutch provided in an embodiment;

[0045] Figure 3 A schematic diagram of the synchronous mechanism gear sleeve engagement process provided in an embodiment;

[0046] Figure 4 A schematic diagram of the decoupling process of the synchronous mechanism gear sleeve provided in the embodiment;

[0047] Figure 5 The working position switching logic diagram of the three-position four-way reversing valve provided in the embodiment;

[0048] Figure numerals: 1. first one-way valve; 2. second one-way valve; 3. pressure relay; 4. three-position four-way reversing valve; 5. hydraulic chamber; 6. multi-plate clutch; 7. pressure accumulator; 8. hydraulic actuator; 9. synchronous mechanism gear sleeve; 10. outer input shaft gear hub; 11. inner output shaft gear hub. DETAILED DESCRIPTION

[0049] The present invention is described below in conjunction with the accompanying drawings. The preferred embodiments described herein are only used to illustrate and explain the present invention and are not used to limit the present invention.

[0050] like Figure 1 As shown, the present application proposes a four-wheel drive vehicle torque management system, comprising:

[0051] Multi-plate clutch 6, torque synchronization mechanism and hydraulic control circuit; wherein,

[0052] Torque synchronization mechanism, comprising:

[0053] Synchronous mechanism gear sleeve 9, outer input shaft gear hub 10 and inner output shaft gear hub 11;

[0054] The outer input shaft gear hub 10 is connected to the outer rotating pair of the multi-plate clutch 6, and the inner output shaft gear hub 11 is connected to the inner rotating pair of the multi-plate clutch 6;

[0055] The hydraulic control circuit is configured to control the movement of the synchronous mechanism gear sleeve 9 so that the synchronous mechanism gear sleeve 9 is connected to the outer input shaft gear hub 10 and the inner output shaft gear hub 11 at the same time, or the synchronous mechanism gear sleeve 9 is only connected to the outer rotary pair.

[0056] Furthermore, the central axes of the outer input shaft gear hub 10 and the inner output shaft gear hub 11 are the same, and the outer input shaft gear hub 10 and the inner output shaft gear hub 11 are connected via an end bearing.

[0057] According to some embodiments of the present application, Figure 1 As shown, the four-wheel drive vehicle torque management system provided in the present application includes: a multi-plate clutch 6, a torque synchronization mechanism and a hydraulic control circuit, the multi-plate clutch 6 includes an inner and outer rotating pair, wherein the outer rotating pair includes a clutch steel plate, the inner rotating pair includes a clutch friction plate, and a hydraulic chamber 5 is arranged between the inner and outer rotating pairs; the torque synchronization mechanism includes: a synchronization mechanism gear sleeve 9, a synchronization mechanism outer input shaft gear hub 10, a synchronization mechanism inner output shaft gear hub 11, and the inner and outer shaft gear hubs are connected by end face bearings; the hydraulic control circuit is used to control the synchronization mechanism gear sleeve 9, and then control the connection and separation of the inner and outer shaft gear hubs.

[0058] Furthermore, the hydraulic control circuit comprises:

[0059] Liquid pump, reversing valve and hydraulic actuator 8; wherein,

[0060] The hydraulic actuator 8 is connected to the synchronous mechanism gear sleeve 9;

[0061] The hydraulic actuator 8 is also connected to the liquid pump via a reversing valve;

[0062] The flow direction of the fluid path of the hydraulic actuator 8 when the reversing valve is in the first working position is opposite to that when the reversing valve is in the second working position.

[0063] Furthermore, the liquid outlet of the liquid pump is also connected to the hydraulic chamber 5 of the multi-plate clutch 6;

[0064] The hydraulic control circuit also includes: a first one-way valve 1 arranged between the liquid outlet of the liquid pump and the liquid inlet of the reversing valve, a second one-way valve 2 arranged between the liquid outlet of the liquid pump and the liquid inlet of the hydraulic chamber 5, and a pressure relay 3;

[0065] Pressure relay 3, configured as:

[0066] When it is detected that the hydraulic pressure value of the hydraulic control circuit is greater than the threshold, a signal is transmitted to the vehicle ECU to control the reversing valve to switch the working position.

[0067] According to some embodiments of the present application, Figure 1 As shown, the hydraulic control circuit includes: a liquid pump, a hydraulic actuator 8, a reversing valve, a one-way valve, a pressure relay 3 and a relief valve. The hydraulic actuator 8 is connected to the synchronous mechanism gear sleeve 9. The hydraulic actuator 8 moves under the drive of the liquid pump, driving the synchronous mechanism gear sleeve 9 to move, thereby controlling the connection and disconnection of the inner output shaft gear hub 11 and the outer output shaft gear hub; the hydraulic actuator 8 is connected to the liquid pump through a reversing valve, and the reversing valve has at least two working positions. When the two working positions are in the opposite state, the movement state of the telescopic mechanism of the hydraulic actuator 8 is opposite, that is, the reversing valve is used to control the telescopic movement of the hydraulic actuator 8; the liquid pump outlet is also connected to the hydraulic chamber 5 of the multi-plate clutch 6, and the clutch transmission torque is controlled by controlling the hydraulic pressure in the hydraulic chamber 5; a one-way valve is provided between the liquid pump outlet and the liquid inlet of the reversing valve, and another one-way valve is provided between the liquid pump outlet and the hydraulic chamber 5. The existence of the one-way valve causes the hydraulic pressure value of the hydraulic control circuit to continue to increase. When the hydraulic pressure value reaches the threshold value, the pressure relay 3 sends a signal to the control module (the vehicle ECU in this embodiment) to control the working position switching of the reversing valve, thereby changing the connection state of the inner output shaft gear hub 11 and the outer output shaft gear hub.

[0068] Furthermore, the vehicle ECU is also configured to adjust the rotation speed of the liquid pump according to the speed difference between the front and rear axles of the vehicle when the synchronous mechanism gear sleeve 9 is only connected to the outer rotation pair.

[0069] According to some embodiments of the present application, the multi-plate clutch 6 is installed on the transmission shaft. When the synchronization mechanism gear sleeve 9 is only connected to the external rotating pair (that is, the synchronization mechanism gear sleeve 9 is not engaged, and the four-wheel drive vehicle torque management system is in the timely four-wheel drive mode), the hydraulic control circuit controls the clutch pressure by adjusting the oil pump speed, thereby adjusting the size of the clutch transmission torque.

[0070] Furthermore, the hydraulic control circuit further includes: a pressure accumulator 7 arranged between the oil outlet of the second one-way valve 2 and the liquid inlet of the hydraulic chamber 5 .

[0071] According to some embodiments of the present application, a pressure accumulator 7 is further provided in the hydraulic control circuit. When the working position of the reversing valve is switched, the hydraulic circuit of the hydraulic actuator 8 is reversed, the pressure of the hydraulic control circuit changes, and the pressure accumulator 7 is used to maintain the pressure of the hydraulic control circuit.

[0072] Furthermore, the reversing valve is a three-position four-way reversing valve 4 .

[0073] According to some embodiments of the present application, Figure 1 As shown, the reversing valve is a three-position four-way reversing valve 4. When the reversing valve is in the left position, the hydraulic actuator 8 takes in oil; when the reversing valve is in the right position, the hydraulic actuator 8 discharges oil; when the reversing valve is in the middle position, the hydraulic circuit of the hydraulic actuator 8 is cut off.

[0074] Figure 2 The principle of the flexible transmission working condition of the multi-disc clutch 6 is shown: the pressure relay 3 is in the closed state, the three-position four-way reversing valve 4 is in the middle position, and the liquid pump discharges the liquid through the first one-way valve 1 and the second one-way valve 2 to supply oil to the hydraulic circuit of the multi-disc clutch 6, so that the pressure accumulator 7 is charged, and at the same time the pressure chamber of the multi-disc clutch 6 is pressurized, and the inner rotating pair and the outer rotating pair of the multi-disc clutch 6 are gradually pressed to realize the transmission of torque, and the size of the transmitted torque is positively correlated with the contact tightness of the rotating pair. At this time, the size of the transmitted torque can be controlled by adjusting the speed of the liquid pump.

[0075] Figure 3 The principle of the synchronous mechanism gear sleeve 9 engagement process is shown: when the pressure of the multi-plate clutch 6 hydraulic circuit rises to the threshold, the pressure relay 3 is triggered, and the control module (vehicle ECU in this embodiment) makes a decision based on the position of the synchronous mechanism gear sleeve 9. If the synchronous mechanism gear sleeve 9 is only engaged with the outer input shaft gear hub 10, the control module controls the three-position four-way reversing valve 4 to enter the left position, conducts the hydraulic circuit of the hydraulic actuator 8, and the hydraulic circuit of the multi-plate clutch 6 is pressurized by the pressure accumulator 7. The hydraulic actuator 8 is fed with liquid on the right side, and the telescopic mechanism moves to the left, driving the synchronous mechanism gear sleeve 9 to move and engage the inner output shaft gear hub 11. After the synchronous mechanism gear sleeve 9 moves to the end of the stroke, the pressure relay 3 controls the three-position four-way reversing valve 4 to return to the middle position through the control module, and locks the synchronous mechanism gear sleeve 9, so that the inner output shaft and the outer input shaft form a hard connection, which is suitable for large torque transmission conditions.

[0076] Figure 4 The principle of the decoupling process of the synchronous mechanism gear sleeve 9 is shown: when the three-position four-way reversing valve 4 is in the middle position, the liquid pump continues to run so that the pressure in the hydraulic circuit gradually increases. When the pressure reaches the threshold, the pressure relay 3 is triggered, and the control module makes a decision based on the position of the synchronous mechanism gear sleeve 9. If the synchronous mechanism gear sleeve 9 is engaged with the outer input shaft gear hub 10 and the inner output shaft gear hub 11 at the same time, the control module controls the three-position four-way reversing valve 4 to run to the right position, the hydraulic actuator 8 inlet and outlet liquid circuits are reversed, and the telescopic mechanism moves to the right, driving the synchronous mechanism gear sleeve 9 to disengage. At the same time, the pressure in the pressure chamber of the multi-plate clutch 6 increases, gradually taking over the torque transmission path, ensuring that the synchronous mechanism gear sleeve 9 can be smoothly pushed out from the inner output shaft gear hub 11, and the outer input shaft is disconnected from the inner output shaft.

[0077] comprehensive Figure 2-Figure 4The given technical solution can obtain the switching logic of the working position of the three-position four-way reversing valve 4, and the switching logic is as follows: Figure 5 shown.

[0078] Further, the system also includes: a manual control switch;

[0079] Manual control switch, configured as:

[0080] In response to the user's operation, the movement of the synchronous mechanism gear sleeve 9 is controlled so that the synchronous mechanism gear sleeve 9 is connected to the outer input shaft gear hub 10 and the inner output shaft gear hub 11 at the same time, or the synchronous mechanism gear sleeve 9 is only connected to the outer rotary pair.

[0081] According to some embodiments of the present application, the control mechanism corresponding to the synchronization mechanism gear sleeve 9 may be a device that can be controlled manually or automatically. When the system pressure reaches a threshold, or the driver selects the full-time four-wheel drive mode, the synchronization mechanism gear sleeve 9 simultaneously engages the inner output shaft gear hub 11 and the outer output shaft gear hub to rigidly connect the front and rear axles to achieve maximum torque transmission.

[0082] In summary, the conduction position of the three-position four-way reversing valve 4 is controlled by the pressure relay 3 through the vehicle ECU, and can also be actively controlled by the user. After the synchronous mechanism gear sleeve 9 is engaged or withdrawn, the three-position four-way reversing valve 4 will return to the middle position to achieve the locking of the synchronous mechanism gear sleeve 9. When the synchronous mechanism gear sleeve 9 is not engaged, the ECU controls the engagement state of the multi-plate clutch 6 by controlling the speed of the liquid pump according to the feedback of the road state, combined with the vehicle speed, wheel speed and other signals, to adjust the torque distribution of the front and rear axles. At this time, the torque management system of the four-wheel drive vehicle is in a timely four-wheel drive state; when the synchronous mechanism gear sleeve 9 is engaged, the torque management system of the four-wheel drive vehicle is transformed into a full-time four-wheel drive state, and the front and rear axles are rigidly connected through the synchronous mechanism gear sleeve 9, which can achieve greater torque transmission to cope with more severe road conditions.

[0083] The present application also proposes a torque management method for a four-wheel drive vehicle, comprising:

[0084] Four-wheel drive vehicle torque management is performed based on the above-mentioned four-wheel drive vehicle torque management system.

[0085] The present application also proposes a car, which is equipped with the above-mentioned four-wheel drive vehicle torque management system.

[0086] It is obvious that a person skilled in the art may make various changes and modifications to the present application without departing from the spirit and scope of the present application. Thus, if these modifications and variations of the present application fall within the scope of the claims of the present application and their equivalents, the present application is also intended to include these modifications and variations.

Claims

1. A four-wheel drive vehicle torque management system, characterized in that: include: A multi-plate clutch (6), a torque synchronization mechanism and a hydraulic control circuit; wherein: The torque synchronization mechanism comprises: Synchronous mechanism gear sleeve (9), outer input shaft gear hub (10) and inner output shaft gear hub (11); The outer input shaft gear hub (10) is connected to the outer rotating pair of the multi-plate clutch (6), and the inner output shaft gear hub (11) is connected to the inner rotating pair of the multi-plate clutch (6); The hydraulic control circuit is configured to control the movement of the synchronous mechanism gear sleeve (9) so that the synchronous mechanism gear sleeve (9) is connected to the outer input shaft gear hub (10) and the inner output shaft gear hub (11) at the same time, or the synchronous mechanism gear sleeve (9) is only connected to the outer rotation pair.

2. The four-wheel drive vehicle torque management system according to claim 1, characterized in that: The central axes of the outer input shaft gear hub (10) and the inner output shaft gear hub (11) are the same, and the outer input shaft gear hub (10) and the inner output shaft gear hub (11) are connected via an end face bearing.

3. The four-wheel drive vehicle torque management system according to claim 1, characterized in that: The hydraulic control circuit comprises: A liquid pump, a reversing valve and a hydraulic actuator (8); wherein: The hydraulic actuator (8) is connected to the synchronous mechanism gear sleeve (9); The hydraulic actuator (8) is also connected to the liquid pump via the reversing valve; The flow direction of the fluid path of the hydraulic actuator (8) when the reversing valve is in the first working position is opposite to the flow direction of the fluid path when the reversing valve is in the second working position.

4. The four-wheel drive vehicle torque management system according to claim 3, characterized in that: The liquid outlet of the liquid pump is also connected to the hydraulic chamber (5) of the multi-plate clutch (6); The hydraulic control circuit further comprises: a first one-way valve (1) arranged between the liquid outlet of the liquid pump and the liquid inlet of the reversing valve, a second one-way valve (2) arranged between the liquid outlet of the liquid pump and the liquid inlet of the hydraulic chamber (5), and a pressure relay (3); The pressure relay (3) is configured as follows: When it is detected that the hydraulic pressure value of the hydraulic control circuit is greater than a threshold value, a signal is transmitted to the vehicle ECU so that it controls the reversing valve to switch the working position.

5. The four-wheel drive vehicle torque management system according to claim 4, characterized in that: The vehicle ECU is further configured to adjust the rotation speed of the liquid pump according to the speed difference between the front and rear axles of the vehicle when the synchronous mechanism gear sleeve (9) is only connected to the outer rotation pair.

6. The four-wheel drive vehicle torque management system according to claim 4, characterized in that: The hydraulic control circuit also includes a pressure accumulator (7) arranged between the oil outlet of the second one-way valve (2) and the liquid inlet of the hydraulic chamber (5).

7. The four-wheel drive vehicle torque management system according to claim 3, characterized in that: The reversing valve is a three-position four-way reversing valve (4).

8. The four-wheel drive vehicle torque management system according to any one of claims 1 to 7, characterized in that: The system further comprises: a manual control switch; The manual control switch is configured as: In response to the user's operation, the movement of the synchronous mechanism gear sleeve (9) is controlled so that the synchronous mechanism gear sleeve (9) is simultaneously connected to the outer input shaft gear hub (10) and the inner output shaft gear hub (11), or the synchronous mechanism gear sleeve (9) is only connected to the outer rotating pair.

9. A torque management method for a four-wheel drive vehicle, characterized in that: include: Four-wheel drive vehicle torque management is performed based on the four-wheel drive vehicle torque management system described in any one of claims 1-8.

10. An automobile, characterized in that: The automobile is equipped with a four-wheel drive vehicle torque management system as described in any one of claims 1-8.

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