Hybrid power driving system with inter-wheel torque distribution function

Abstract

The invention discloses a hybrid power driving system with an inter-wheel torque distribution function. The hybrid power driving system comprises an engine (100), a main speed reducer (700), a motor (130), a differential mechanism (900), a first mode switching mechanism (500), a second mode switching mechanism (110), a clutch (300), a bevel gear transmission mechanism (600), a first planet row gear mechanism (200), a second planet row gear mechanism (120), a power transmission shaft (400), a left half shaft (140) and a right half shaft (800). According to the invention, the engine (100), the motor (130), the first mode switching mechanism (500), the second mode switching mechanism (110) and the clutch (300) are controlled; five working modes including an engine independent working mode, an engine inter-wheel torque distribution working mode, a motor independent working mode, an engine-motor torque coupling working mode and an engine-motor rotating speed coupling working mode can be achieved, and the five working modes are switched. And the dynamic property and the economical efficiency of the hybrid power vehicle under complex working conditions can be obviously improved.

Description

Technical Field

[0001] The present invention belongs to the field of new energy vehicle transmission, and in particular relates to a hybrid power drive system with an inter-wheel torque distribution function. Background Art

[0002] Hybrid vehicles have the advantages of low carbon and environmental protection, good economic performance, and can effectively solve the anxiety of pure electric vehicle driving range, and have attracted increasing attention. At present, hybrid systems generally use open differentials to distribute the driving torque to the left and right wheels. The open differential has the working characteristics of "differential but not torque difference", that is, the speed of the output ends of the left and right sides of the open differential can be different but the torque is always equal. The working characteristics of the open differential "differential but not torque difference" will cause the wheels on the low adhesion coefficient side to slip when the hybrid vehicle is driving on a road with uneven road adhesion coefficient, while the wheels on the high adhesion coefficient side lose power, affecting the passability and safety of the hybrid vehicle under such working conditions. In addition, the hybrid system has two different power sources, the motor and the engine, and has multiple different power coupling working modes. By controlling the output torque and speed of different power sources, the high-efficiency working range of each power source can be fully utilized, thereby effectively improving the overall economy of the hybrid vehicle.

[0003] To this end, it is necessary to invent a hybrid drive system that can realize the inter-wheel torque distribution function and has multiple working modes, so as to effectively improve the vehicle's passability, safety and economy under complex working conditions. Summary of the invention

[0004] The present invention provides a hybrid power drive system with an inter-wheel torque distribution function. The main purpose of the present invention is to realize the vehicle's inter-wheel torque distribution function by controlling the power coupling mode between the hybrid vehicle motor and the engine, make full use of the high-efficiency working range of different power sources, improve the hybrid vehicle's passability on harsh roads, active safety in cornering conditions, and improve the vehicle's driving economy.

[0005] To achieve the above purpose, the technical solution provided by the present invention is:

[0006] A hybrid power drive system with an inter-wheel torque distribution function, characterized in that it comprises: an engine (100), a main reducer (700), a motor (130), a differential (900), a first mode switching mechanism (500), a second mode switching mechanism (110), a clutch (300), a bevel gear transmission mechanism (600), a first planetary gear mechanism (200), a second planetary gear mechanism (120), a power transmission shaft (400), a left half shaft (140), and a right half shaft (800);

[0007] The motor (130) is a hollow shaft inner rotor motor, comprising: a stator (131), a motor housing (132), a hollow shaft inner rotor (133), and a hollow power output shaft (134); the hollow power output shaft (134) is connected to the hollow shaft inner rotor (133) via a spline;

[0008] The planetary gear mechanism (200) comprises: a sun gear (201), planetary gears (202), a planet carrier (203), and a ring gear (204); the sun gear (201) is connected to the power output shaft of the engine via a spline, and the planet carrier (203) is connected to the power transmission shaft (400) via a spline;

[0009] The active plate of the clutch (300) is connected to the ring gear (204), and the driven plate of the clutch (300) is connected to a fixed end;

[0010] The mode switching mechanism 1 (500) comprises: a coupling sleeve (501), an upper gear ring (502), a lower gear ring (503), and a spline hub (504);

[0011] The main reducer (700) comprises: a driving gear (701) and a driven gear (702), wherein the driving gear (701) is connected to the power transmission shaft (400) via a spline, and the driven gear (702) is connected to an outer housing of the differential (900);

[0012] The second planetary gear mechanism (120) comprises: a sun gear (121), a planet gear (122), a planet carrier (123), and a ring gear (124); the sun gear (121) is connected to the hollow power output shaft (134) via a spline;

[0013] The bevel gear transmission mechanism (600) comprises: a driving bevel gear (601) and a driven bevel gear (602), wherein the driving bevel gear (601) is connected to the gear ring (124), and the driven bevel gear (602) is supported by an idler sleeve on the power transmission shaft (400);

[0014] The second mode switching mechanism (110) comprises: a coupling sleeve (111), a right gear ring (112), a spline hub (113), and a left gear ring (114).

[0015] Preferably, the upper ring gear (502) of the mode switching mechanism 1 (500) is connected to the ring gear (204) via a spline, the lower ring gear (503) is connected to the power transmission shaft (400) via a spline, and the spline hub (504) is connected to the driven bevel gear (602) via a spline.

[0016] Preferably, the left ring gear (114) of the second mode switching mechanism (110) is connected to the fixed end via a spline, the right ring gear (112) is connected to the left half shaft via a spline, and the spline hub (113) is connected to the planet carrier (123) via a spline.

[0017] Preferably, in order to achieve equal and reverse transfer of the driving torque output by the engine (100) between the left half shaft (140) and the right half shaft (800), the transmission ratio of the bevel gear transmission mechanism (600) is , the transmission ratio of the main reducer (700) , characteristic parameters of the second planetary gear mechanism (120) The design requirements that need to be met are: ;

[0018] in, is the ratio of the number of teeth of the driven bevel gear (602) to the number of teeth of the driving bevel gear (601), is the ratio of the number of teeth of the driven gear (702) to the number of teeth of the driving gear (701), is the ratio of the number of teeth of the ring gear (124) to the number of teeth of the sun gear (121).

[0019] Preferably, by controlling the engine (100), the motor (130), the clutch (300), the mode switching mechanism 1 (500) and the mode switching mechanism 2 (110), the hybrid power drive system with an inter-wheel torque distribution function can realize five working modes, namely, an engine independent working mode, an engine inter-wheel torque distribution working mode, a motor independent working mode, an engine-motor torque coupling working mode and an engine-motor speed coupling working mode;

[0020] When the coupling sleeve (111) of the second mode switching mechanism (110) is in a middle position, the clutch (300) is engaged, the engine (100) outputs torque, and the motor (130) does not output torque. At this time, the hybrid power drive system with inter-wheel torque distribution function operates in an engine independent working mode, and the output torque of the engine (100) alone drives the vehicle to travel;

[0021] When the coupling sleeve (501) of the mode switching mechanism 1 (500) is at the lower end position, the spline hub (504) is connected to the lower gear ring (503) through the coupling sleeve (501), and the coupling sleeve (111) of the mode switching mechanism 2 (110) is at the right end position, the spline hub (113) is connected to the right gear ring (112) through the coupling sleeve (111), the clutch (300) is engaged, the engine (100) outputs torque, and the motor (130) outputs torque. At this time, the hybrid power drive system with inter-wheel torque distribution function operates in the engine inter-wheel torque distribution working mode, and the vehicle is driven by controlling the output torque of the engine (100), and the drive torque is transferred and distributed between the left half shaft (140) and the right half shaft (800) by controlling the output torque of the motor (100);

[0022] When the coupling sleeve (501) of the mode switching mechanism 1 (500) is at the lower end position, the spline hub (504) is connected to the lower gear ring (503) via the coupling sleeve (501), and the coupling sleeve (111) of the mode switching mechanism 2 (110) is at the left end position, the spline hub (113) is connected to the left gear ring (114) via the coupling sleeve (111), the clutch (300) is disconnected, the engine (100) does not output torque, and the motor (130) outputs torque. At this time, the hybrid power drive system with inter-wheel torque distribution function operates in a motor independent drive mode, and the torque output by the motor (130) drives the vehicle to travel alone;

[0023] When the coupling sleeve (501) of the mode switching mechanism 1 (500) is at the lower end position, the spline hub (504) is connected to the lower gear ring (503) through the coupling sleeve (501), and the coupling sleeve (111) of the mode switching mechanism 2 (110) is at the left end position, the spline hub (113) is connected to the left gear ring (114) through the coupling sleeve (111), the clutch (300) is engaged, the engine (100) outputs torque, and the motor (130) outputs torque. At this time, the hybrid power drive system with inter-wheel torque distribution function operates in an engine-motor torque coupling working mode, and the coupling effect between the output torques of the engine (100) and the motor (130) jointly drives the vehicle to travel;

[0024] When the coupling sleeve (501) of the mode switching mechanism 1 (500) is at the upper end position, the spline hub (504) is connected to the upper gear ring (502) through the coupling sleeve (501), and the coupling sleeve (111) of the mode switching mechanism 2 (110) is at the left end position, the spline hub (113) is connected to the left gear ring (114) through the coupling sleeve (111), the clutch (300) is disconnected, the engine (100) outputs torque, and the motor (130) is in a speed control mode. At this time, the hybrid power drive system with inter-wheel torque distribution function operates in an engine-motor speed coupling working mode, and the output speeds between the engine (100) and the motor (130) jointly drive the vehicle to travel through the speed coupling effect of the planetary gear mechanism 1 (200).

[0025] The beneficial effects of the present invention are:

[0026] 1. The hybrid power drive system with inter-wheel torque distribution function described in the present invention can effectively overcome the disadvantage of the traditional hybrid power drive system that the driving torque of the wheels on both sides is always the same due to the use of an open differential, and realize the arbitrary transfer and distribution of the engine driving torque between the left and right wheels, thereby significantly improving the vehicle's passability and active safety.

[0027] 2. The hybrid power drive system with inter-wheel torque distribution function described in the present invention has multiple working modes such as engine independent working mode, motor independent working mode, engine-motor torque coupling working mode, engine-motor speed coupling working mode, etc. It can make full use of the high efficiency range between different power sources by switching between different working modes, and significantly improve the economy of the vehicle. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] Figure 1 The figure is a schematic structural diagram of a hybrid power drive system with inter-wheel torque distribution function according to the present invention.

[0030] Figure 2 This is a schematic diagram of torque flow when a hybrid power drive system with inter-wheel torque distribution function described in the present invention is in an engine independent working mode.

[0031] Figure 3 The figure is a torque flow diagram of a hybrid power drive system with inter-wheel torque distribution function described in the present invention when it is in an engine inter-wheel torque distribution working mode.

[0032] Figure 4 This is a schematic diagram of torque flow when a hybrid power drive system with inter-wheel torque distribution function described in the present invention is in an independent motor working mode.

[0033] Figure 5 The figure is a schematic diagram of torque flow when a hybrid power drive system with inter-wheel torque distribution function described in the present invention is in an engine-motor torque coupling working mode.

[0034] Figure 6 The figure is a schematic diagram of torque flow when a hybrid power drive system with inter-wheel torque distribution function described in the present invention is in an engine-motor speed coupling working mode. DETAILED DESCRIPTION

[0036] The present invention is further described in detail below in conjunction with the accompanying drawings so that those skilled in the art can implement the invention with reference to the description.

[0037] like Figure 1 As shown, the present invention provides a hybrid power drive system with an inter-wheel torque distribution function, and its components shown in the figure are: 100-engine, 101-engine power output shaft, 200-planetary gear mechanism 1, 201-sun gear of planetary gear mechanism 1, 202-planetary gear of planetary gear mechanism 1, 203-planet carrier of planetary gear mechanism 1, 204-ring gear of planetary gear mechanism 1, 300-clutch, 400-power transmission shaft, 500-mode switching mechanism 1, 501-coupling sleeve of mode switching mechanism 1, 502-upper ring gear of mode switching mechanism 1, 503-lower ring gear of mode switching mechanism 1, 503-spline hub of mode switching mechanism 1, 600-bevel gear transmission mechanism, 601-active bevel gear of bevel gear transmission mechanism, 602-driven bevel gear of bevel gear transmission mechanism, 601 - the driving bevel gear of the bevel gear transmission mechanism, 700 - the main reducer, 701 - the driving gear of the main reducer, 702 - the driven gear of the main reducer, 800 - the right half shaft, 900 - the differential, 110 - the mode switching mechanism 2, 111 - the coupling sleeve of the mode switching mechanism 2, 112 - the right ring gear of the mode switching mechanism 2, 113 - the spline hub of the mode switching mechanism 2, 114 - the left ring gear of the mode switching mechanism 2, 120 - the planetary gear mechanism, 121 - the sun gear of the planetary gear mechanism 2, 122 - the planetary gear of the planetary gear mechanism 2, 123 - the planetary carrier of the planetary gear mechanism 2, 124 - the ring gear of the planetary gear mechanism 2, 130 - the motor, 131 - the stator of the motor, 132 - the motor housing of the motor, 133 - the hollow shaft inner rotor of the motor, 134 - the hollow power output shaft of the motor, 140 - the left half shaft.

[0038] The motor (130) is a hollow shaft inner rotor motor, comprising: a stator (131), a motor housing (132), a hollow shaft inner rotor (133), and a hollow power output shaft (134), wherein the hollow power output shaft (134) and the hollow shaft inner rotor (133) are connected via a spline. The planetary gear transmission mechanism (200) comprises: a sun gear (201), a planetary gear (202), a planetary carrier (203), and a ring gear (204), wherein the sun gear (201) and the power output shaft (101) of the engine (100) are connected via a spline, and the planetary carrier (203) and the power transmission shaft (400) are connected via a spline. The active plate of the clutch (300) is connected to the ring gear 204, and the driven plate of the clutch (300) is connected to the fixed end. The main reducer (700) includes: a driving gear (701) and a driven gear (702). The driving gear (701) is connected to the power transmission shaft (400) via a spline, and the driven gear (702) is connected to the external housing of the differential (900). The second planetary gear mechanism (120) includes: a sun gear (121), planetary gears (122), a planet carrier (123), and a ring gear (124). The sun gear (121) is connected to a hollow power output shaft (134) via a spline. The bevel gear transmission mechanism (600) includes: a driving bevel gear (601) and a driven bevel gear (602). The driving bevel gear (601) is connected to the ring gear (124), and the driven bevel gear (602) is supported by an idler sleeve on the power transmission shaft (400). The mode switching mechanism 1 (500) comprises: a coupling sleeve (501), an upper gear ring (502), a lower gear ring (503), and a spline hub (504). The upper gear ring (502) is connected to the gear ring (204) via a spline, the lower gear ring (503) is connected to the power transmission shaft (400) via a spline, and the spline hub (504) is connected to the driven bevel gear (602) via a spline. The mode switching mechanism 2 (110) comprises a coupling sleeve (111), a right gear ring (112), a spline hub (113), and a left gear ring (114). The left gear ring (114) is connected to the fixed end via a spline, the right gear ring (112) is connected to the left half shaft (140) via a spline, and the spline hub (113) is connected to the planet carrier (123) via a spline.

[0039] In order to achieve equal and reverse transfer of the driving torque output by the engine (100) between the left half shaft (140) and the right half shaft (800), the transmission ratio of the bevel gear transmission mechanism (600) is , transmission ratio of the main reducer (700) 、Characteristic parameters of planetary gear mechanism 2 (120) The design requirements that need to be met are: ;

[0040] in, is the ratio of the number of teeth of the driven bevel gear (602) to the number of teeth of the driving bevel gear (601), is the ratio of the number of teeth of the driven gear (702) to the number of teeth of the driving gear (701), is the ratio of the number of teeth of the ring gear (124) to the number of teeth of the sun gear (121).

[0041] The following is combined with Figure 2 To the attached Figure 6 The working principle of the hybrid power drive system with inter-wheel torque distribution function described in the present invention is further described in detail.

[0042] like Figure 2 When the vehicle is traveling in a straight line, when the battery power is low or the vehicle is traveling in the engine's high-efficiency operating range, a hybrid drive system with an inter-wheel torque distribution function operates in an engine independent operating mode. At this time, the coupling sleeve (111) of the second mode switching mechanism (110) is in a middle position, the clutch (300) is engaged, the engine (100) outputs torque, and the motor (130) does not output torque. The output torque of the engine (100) is transmitted to the differential (900) in sequence through the engine power output shaft (101) → sun gear (201) → planetary carrier (203) → power transmission shaft (400) → driving gear (701) → driven gear (702), and finally the differential (900) evenly distributes the power to the left half shaft (140) and the right half shaft (800).

[0043] like Figure 3 As described above, when the vehicle is turning or one side of the wheel slips, a hybrid power drive system with an inter-wheel torque distribution function operates in the engine inter-wheel torque distribution working mode. At this time, the coupling sleeve (501) of the mode switching mechanism 1 (500) is at the lower end position to connect the spline hub (504) and the lower gear ring (503) through the coupling sleeve (501), and the coupling sleeve (111) of the mode switching mechanism 2 (110) is at the right end position to connect the spline hub (113) and the right gear ring (112) through the coupling sleeve (111), the clutch (300) is engaged, the engine (100) outputs torque, and the motor (130) outputs torque. The torque output by the engine (100) , and then transmitted to the differential (900) in sequence through the engine power output shaft (101) → sun gear (201) → planetary carrier (203) → power transmission shaft (400) → driving gear (701) → driven gear (702), and finally the differential 900 evenly distributes the power to the left half shaft (140) and the right half shaft (800). The torque output by the motor (130) , and is transmitted to the second planetary gear mechanism (120) through the hollow power output shaft (134) in sequence. A portion of the torque is transmitted to the left half shaft (140) through the planet carrier (123) → spline hub (113) → coupling sleeve (111) → right ring gear (112) in sequence. A portion of the torque is transmitted to the left half shaft (140) through the ring gear (124) → driving bevel gear (601) → driven bevel gear (602) → spline hub (504) → coupling sleeve (501) → lower ring gear (503) → power transmission shaft (400) → driving gear (701) → driven gear (702) in sequence. Finally, the differential (900) evenly distributes the power to the left half shaft (140) and the right half shaft (800). At this time, the output torque of the left half shaft (140) is , the output torque of the right half shaft (800) is ,in, are characteristic parameters of the planetary gear mechanism 1 (200).

[0044] like Figure 4 When the vehicle is traveling in a straight line and the power demand torque is small, the engine operates in a low efficiency range, and a hybrid power drive system with an inter-wheel torque distribution function operates in a motor independent operation mode. At this time, the coupling sleeve (501) of the mode switching mechanism 1 (500) is at the lower end position to connect the spline hub (504) and the lower gear ring (503) through the coupling sleeve (501), and the coupling sleeve (111) of the mode switching mechanism 2 (110) is at the left end position to connect the spline hub (113) and the left gear ring (114) through the coupling sleeve (111), the clutch (300) is disconnected, the engine (100) does not output torque, and the motor (130) outputs torque. The torque output by the motor (130) is transmitted to the differential (900) in sequence through the hollow power output shaft (134) → the sun gear (121) → the ring gear (124) → the driving bevel gear (601) → the driven bevel gear (602) → the spline hub (504) → the coupling sleeve (501) → the lower ring gear (503) → the power transmission shaft (400) → the driving gear (701) → the driven gear (702), and finally the differential (900) evenly distributes the power to the left half shaft (140) and the right half shaft (800).

[0045] like Figure 5When the vehicle is traveling in a straight line at a low speed and the power demand torque is large, a hybrid power drive system with an inter-wheel torque distribution function operates in an engine-motor torque coupling working mode. At this time, the coupling sleeve (501) of the mode switching mechanism 1 (500) is at the lower end position to connect the spline hub (504) and the lower gear ring (503) through the coupling sleeve (501), the coupling sleeve (111) of the mode switching mechanism 2 (110) is at the left end position to connect the spline hub (113) and the left gear ring (114) through the coupling sleeve (111), the clutch (300) is engaged, the engine (100) outputs torque, and the motor (130) outputs torque. The output torque of the engine (100) is transmitted to the differential (900) in sequence through the engine power output shaft 101 → the sun gear (201) → the planetary carrier (203) → the power transmission shaft (400) → the driving gear (701) → the driven gear (702), and finally the differential (900) evenly distributes the power to the left half shaft (140) and the right half shaft (800). The torque output by the motor (130) is transmitted to the differential (900) in sequence through the hollow power output shaft (134) → the sun gear (121) → the ring gear (124) → the driving bevel gear (601) → the driven bevel gear (602) → the spline hub (504) → the coupling sleeve (501) → the lower ring gear (503) → the power transmission shaft (400) → the driving gear (701) → the driven gear (702), and finally the differential (900) evenly distributes the power to the left half shaft (140) and the right half shaft (800).

[0046] like Figure 6 When the vehicle is traveling in a straight line at high speed and the power demand torque is large, a hybrid power drive system with an inter-wheel torque distribution function operates in an engine-motor speed coupling working mode. At this time, the coupling sleeve (501) of the mode switching mechanism 1 (500) is at the upper end position to connect the spline hub (504) and the upper gear ring (502) through the coupling sleeve (501), the coupling sleeve (111) of the mode switching mechanism 2 (110) is at the left end position to connect the spline hub (113) and the left gear ring (114) through the coupling sleeve (111), the clutch is disconnected (300), the engine (100) outputs torque, and the motor (130) is in a speed control mode. The rotation speed output by the motor (130) passes through the hollow power output shaft (134) → the sun gear (121) → the ring gear (124) → the driving bevel gear (601) → the driven bevel gear (602) → the spline hub (504) → the coupling sleeve (501) → the upper ring gear (502) in sequence, and is finally transmitted to the ring gear (204) and the rotation speed transmitted to the sun gear (201) by the engine (100), and the rotation speed is coupled through the planetary gear mechanism (200) to drive the vehicle to travel.

[0047] Although the embodiments of the present invention have been disclosed as above, they are not limited to the applications listed in the specification and the implementation modes, and they can be fully applied to various fields suitable for the present invention. For those familiar with the art, additional modifications can be easily implemented. Therefore, without departing from the general concept defined by the claims and the scope of equivalents, the present invention is not limited to the specific details and the illustrations shown and described herein.

Claims

1. A hybrid power drive system with inter-wheel torque distribution function, characterized in that: include: An engine (100), a main reducer (700), a motor (130), a differential (900), a mode switching mechanism 1 (500), a mode switching mechanism 2 (110), a clutch (300), a bevel gear transmission mechanism (600), a planetary gear mechanism 1 (200), a planetary gear mechanism 2 (120), a power transmission shaft (400), a left half shaft (140), and a right half shaft (800); The motor (130) is a hollow shaft inner rotor motor, comprising: a stator (131), a motor housing (132), a hollow shaft inner rotor (133), and a hollow power output shaft (134); the hollow power output shaft (134) is connected to the hollow shaft inner rotor (133) via a spline; The planetary gear mechanism (200) comprises: a sun gear (201), planetary gears (202), a planet carrier (203), and a ring gear (204); the sun gear (201) is connected to the power output shaft of the engine via a spline, and the planet carrier (203) is connected to the power transmission shaft (400) via a spline; The active plate of the clutch (300) is connected to the ring gear (204), and the driven plate of the clutch (300) is connected to a fixed end; The mode switching mechanism 1 (500) comprises: a coupling sleeve (501), an upper gear ring (502), a lower gear ring (503), and a spline hub (504); The main reducer (700) comprises: a driving gear (701) and a driven gear (702), wherein the driving gear (701) is connected to the power transmission shaft (400) via a spline, and the driven gear (702) is connected to an outer housing of the differential (900); The second planetary gear mechanism (120) comprises: a sun gear (121), a planet gear (122), a planet carrier (123), and a ring gear (124); the sun gear (121) is connected to the hollow power output shaft (134) via a spline; The bevel gear transmission mechanism (600) comprises: a driving bevel gear (601) and a driven bevel gear (602), wherein the driving bevel gear (601) is connected to the gear ring (124), and the driven bevel gear (602) is supported by an idler sleeve on the power transmission shaft (400); The second mode switching mechanism (110) comprises: a coupling sleeve (111), a right gear ring (112), a spline hub (113), and a left gear ring (114).

2. A hybrid power drive system with inter-wheel torque distribution function according to claim 1, characterized in that: The upper gear ring (502) of the mode switching mechanism 1 (500) is connected to the gear ring (204) via a spline, the lower gear ring (503) is connected to the power transmission shaft (400) via a spline, and the spline hub (504) is connected to the driven bevel gear (602) via a spline.

3. The hybrid power drive system with inter-wheel torque distribution function according to claim 1, characterized in that: The left ring gear (114) of the second mode switching mechanism (110) is connected to the fixed end via a spline, the right ring gear (112) is connected to the left half shaft via a spline, and the spline hub (113) is connected to the planet carrier (123) via a spline.

4. The hybrid power drive system with inter-wheel torque distribution function according to claim 1, characterized in that: In order to achieve the transfer and distribution of the driving torque output by the engine (100) between the left half shaft (140) and the right half shaft (800) with equal values ​​and opposite directions, the transmission ratio of the bevel gear transmission mechanism (600) is , the transmission ratio of the main reducer (700) , characteristic parameters of the second planetary gear mechanism (120) The design requirements that need to be met are: ; in, is the ratio of the number of teeth of the driven bevel gear (602) to the number of teeth of the driving bevel gear (601), is the ratio of the number of teeth of the driven gear (702) to the number of teeth of the driving gear (701), is the ratio of the number of teeth of the ring gear (124) to the number of teeth of the sun gear (121).

5. The hybrid power drive system with inter-wheel torque distribution function according to claim 1, characterized in that: By controlling the engine (100), the motor (130), the clutch (300), the mode switching mechanism 1 (500) and the mode switching mechanism 2 (110), the hybrid power drive system with an inter-wheel torque distribution function can realize five working modes, namely, an engine independent working mode, an engine inter-wheel torque distribution working mode, a motor independent working mode, an engine-motor torque coupling working mode and an engine-motor speed coupling working mode; When the coupling sleeve (111) of the second mode switching mechanism (110) is in a middle position, the clutch (300) is engaged, the engine (100) outputs torque, and the motor (130) does not output torque. At this time, the hybrid power drive system with inter-wheel torque distribution function operates in an engine independent working mode, and the output torque of the engine (100) alone drives the vehicle to travel; When the coupling sleeve (501) of the mode switching mechanism 1 (500) is at the lower end position, the spline hub (504) is connected to the lower gear ring (503) through the coupling sleeve (501), and the coupling sleeve (111) of the mode switching mechanism 2 (110) is at the right end position, the spline hub (113) is connected to the right gear ring (112) through the coupling sleeve (111), the clutch (300) is engaged, the engine (100) outputs torque, and the motor (130) outputs torque. At this time, the hybrid power drive system with inter-wheel torque distribution function operates in the engine inter-wheel torque distribution working mode, and the vehicle is driven by controlling the output torque of the engine (100), and the drive torque of the engine (100) is transferred and distributed between the left half shaft (140) and the right half shaft (800) by controlling the output torque of the motor (100); When the coupling sleeve (501) of the mode switching mechanism 1 (500) is at the lower end position, the spline hub (504) is connected to the lower gear ring (503) via the coupling sleeve (501), and the coupling sleeve (111) of the mode switching mechanism 2 (110) is at the left end position, the spline hub (113) is connected to the left gear ring (114) via the coupling sleeve (111), the clutch (300) is disconnected, the engine (100) does not output torque, and the motor (130) outputs torque. At this time, the hybrid power drive system with inter-wheel torque distribution function operates in a motor independent drive mode, and the torque output by the motor (130) drives the vehicle to travel alone; When the coupling sleeve (501) of the mode switching mechanism 1 (500) is at the lower end position, the spline hub (504) is connected to the lower gear ring (503) through the coupling sleeve (501), and the coupling sleeve (111) of the mode switching mechanism 2 (110) is at the left end position, the spline hub (113) is connected to the left gear ring (114) through the coupling sleeve (111), the clutch (300) is engaged, the engine (100) outputs torque, and the motor (130) outputs torque. At this time, the hybrid power drive system with inter-wheel torque distribution function operates in an engine-motor torque coupling working mode, and the coupling effect between the output torques of the engine (100) and the motor (130) jointly drives the vehicle to travel; When the coupling sleeve (501) of the mode switching mechanism 1 (500) is at the upper end position, the spline hub (504) is connected to the upper gear ring (502) through the coupling sleeve (501), and the coupling sleeve (111) of the mode switching mechanism 2 (110) is at the left end position, the spline hub (113) is connected to the left gear ring (114) through the coupling sleeve (111), the clutch (300) is disconnected, the engine (100) outputs torque, and the motor (130) is in a speed control mode. At this time, the hybrid power drive system with inter-wheel torque distribution function operates in an engine-motor speed coupling working mode, and the output speeds between the engine (100) and the motor (130) jointly drive the vehicle to travel through the speed coupling effect of the planetary gear mechanism 1 (200).

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