Eight-wheel all-terrain special vehicle chassis hybrid power transmission system and working method thereof

Abstract

The application discloses an eight-wheel all-terrain special vehicle chassis hybrid power transmission system and a working method thereof. The eight-wheel all-terrain special vehicle chassis hybrid power transmission system comprises an extended range system, a left wheel side driving system, a central differential system, a right wheel side driving system, a right traveling system and a left traveling system. The specific working mode of the eight-wheel all-terrain special vehicle chassis hybrid power transmission system is as follows: a double-motor pure electric mode, a single-motor pure electric mode, a three-motor large-torque pure electric mode, an extended range driving mode and a hybrid power driving mode. The eight-wheel all-terrain special vehicle chassis hybrid power transmission system can be switched in time according to the traveling road condition and the use performance requirement of the whole vehicle, the energy utilization rate and the transmission efficiency are higher, the use performance requirement in special environment is met, and the economy and the power performance of the whole vehicle can be better balanced.

Description

Technical Field

[0001] This invention relates to the field of all-terrain vehicle technology, and in particular to a hybrid power transmission system for an eight-wheeled all-terrain special vehicle chassis and its working method. Background Technology

[0002] Because all-terrain vehicles are special vehicles used in complex terrains, they need to have the ability to turn around on the spot in special situations, output high torque when climbing steep slopes, and drive silently in special environments using pure electric power. Most existing all-terrain vehicles are conventionally fuel-powered, with the engine operating under all conditions across the entire speed range, resulting in high fuel consumption, low efficiency, and a lack of performance requirements for use in special environments. Under complex and changing operating conditions, power flow and energy flow cannot be switched in real time, leading to extremely low energy utilization and transmission efficiency. Summary of the Invention

[0003] The purpose of this invention is to overcome the shortcomings of the prior art and provide a hybrid power transmission system for an eight-wheel all-terrain special vehicle chassis and its working method, which has a higher energy utilization rate.

[0004] The objective of this invention is achieved as follows: A hybrid powertrain system for an eight-wheel all-terrain special vehicle chassis includes a range extender system, a left-wheel drive system, a central differential system, a right-wheel drive system, a right-hand drive system, and a left-hand drive system. The range extender system includes an engine, an engine clutch, a drive motor, a drive motor clutch, and a range extender system drive gear connected in sequence. The engine is a gasoline engine. The central differential system includes a differential assembly, which has a power input bevel gear. The power input bevel gear of the differential assembly meshes with the drive gear of the range extender system. The two output ends of the differential assembly are respectively powered to the left bevel gear and the right bevel gear of the central differential. The left-wheel drive system includes a left-wheel drive system main drive motor, a left-wheel drive system clutch, a left-wheel drive system driving spur gear, and a left-wheel drive system bevel gear connected in sequence. The left-wheel drive system bevel gear meshes with the left bevel gear of the central differential, and the left-wheel drive system driving spur gear meshes with the left-wheel drive system driven spur gear. The left driving system includes a left power transmission assembly and four left driving system assemblies corresponding to the four left wheels respectively. The left power transmission assembly is equipped with left active bevel gears corresponding to the four left driving system assemblies respectively. The left wheel side drive system passive spur gear is set on the left power transmission assembly. The four left driving system assemblies are each equipped with a left passive bevel gear. Each left passive bevel gear meshes with the corresponding left active bevel gear for transmission. The right wheel drive system includes a right wheel drive system main drive motor, a right wheel drive system clutch, a right wheel drive system driving spur gear, and a right wheel drive system bevel gear connected in sequence. The right wheel drive system bevel gear meshes with the right bevel gear of the central differential, and the right wheel drive system driving spur gear meshes with the right wheel drive system driven spur gear. The right-hand drive system includes a right power transmission assembly and four right-hand drive system components corresponding to the four right-hand wheels. The right power transmission assembly is equipped with right drive bevel gears corresponding to the four right-hand drive system components. The right-hand drive system driven spur gear is mounted on the right power transmission assembly. The four right-hand drive system components are each equipped with a right driven bevel gear, and each right driven bevel gear meshes with the corresponding right drive bevel gear for transmission.

[0005] Preferably, it also includes a housing, and the range extender system, the central differential system, the left wheel-side drive system, the right wheel-side drive system, the left driving system, and the right driving system are respectively supported on the housing by bearings.

[0006] Preferably, the left power transmission assembly and the right power transmission assembly each include a transmission rod arranged along the vehicle's driving direction, and each of the left driving bevel gear, the right driving bevel gear, the left wheel-side drive system driven spur gear, and the right wheel-side drive system driven spur gear is respectively mounted on the corresponding transmission rod.

[0007] Preferably, the driven spur gear of the left wheel-side drive system and the driven spur gear of the right wheel-side drive system are respectively installed in the middle of the corresponding transmission rod.

[0008] A working method for a hybrid power transmission system for an eight-wheeled all-terrain special vehicle chassis. Dual-motor pure electric mode: Both the engine clutch and the drive motor clutch are disengaged, and the main drive motors of the left-wheel drive system and the right-wheel drive system work simultaneously; when the main drive motors of the left-wheel drive system and the right-wheel drive system rotate in the same direction, the vehicle achieves pure electric silent driving; when the main drive motors of the left-wheel drive system and the right-wheel drive system rotate at different speeds, the vehicle achieves steering. Single-motor pure electric mode: The engine clutch is disengaged, the drive motor clutch is engaged, and the clutches of the left wheel-side drive system and the right wheel-side drive system are both disengaged. The vehicle is driven only by the drive motor through the central differential system, which is suitable for low-power demand conditions on flat roads. Three-motor high-torque pure electric mode: The drive motor clutch, the left wheel drive system clutch and the right wheel drive system clutch are all closed, and the drive motor, the main drive motor of the left wheel drive system and the main drive motor of the right wheel drive system participate in driving at the same time to achieve high-torque pure electric silent driving. Range-extended drive mode: The engine clutch and drive motor clutch are engaged, while the left wheel-side drive system clutch and the right wheel-side drive system clutch are disengaged. The engine and drive motor drive the vehicle in series, which is suitable for driving in the medium and high speed range. Hybrid drive mode: The engine clutch, drive motor clutch, left wheel drive system clutch and right wheel drive system clutch are all closed. The engine, drive motor, left wheel drive system main drive motor and right wheel drive system main drive motor work together to drive the vehicle forward at high speed or to cope with heavy load climbing conditions.

[0009] Due to the adoption of the above technical solution, the present invention has the following beneficial effects: Under various operating conditions, power flow and energy flow switch in real time, resulting in higher energy utilization and transmission efficiency, and meeting the performance requirements for use in special environments.

[0010] This invention patent features a flexible and diverse power transmission path, which switches the power flow path in real time according to the vehicle control strategy, energy strategy and algorithm, so as to better balance the vehicle's economy and power performance. Attached Figure Description

[0011] Figure 1 This is a schematic diagram of the structure of the present invention. Detailed Implementation

[0012] A hybrid power transmission system for an eight-wheel all-terrain special vehicle chassis includes a range extender system 1, a left-wheel drive system 4, a central differential system 3, a right-wheel drive system 2, a right-hand drive system 5, and a left-hand drive system 6.

[0013] The range extender system 1 includes an engine 1-1, a left support bearing 1-2, an engine clutch 1-3, an M1 drive motor 1-4, an M1 drive motor clutch 1-5, a right support bearing 1-6, and a drive gear 1-7. The range extender system 1 is supported on the assembly housing by the left support bearing 1-2 and the right support bearing 1-6.

[0014] The left-wheel drive system 4 includes a left-wheel drive system clutch 4-1, a left-wheel drive system left support bearing 4-2, a left-wheel drive system bevel gear 4-3, a left-wheel drive system driving spur gear 4-4, a left-wheel drive system driven spur gear 4-7, a left-wheel drive system right support bearing 4-6, and a left-wheel drive system main drive motor 4-5. The left-wheel drive system 4 is supported on the housing by the left-wheel drive system left support bearing 4-2 and the left-wheel drive system right support bearing 4-6.

[0015] The central differential system 3 includes an upper support bearing 3-1, a differential assembly with bevel gears 3-2, a lower support bearing 3-3, a left bevel gear 3-4, and a right bevel gear 3-5. The central differential system 3 is supported on the housing by the upper support bearing 3-1 and the lower support bearing 3-3.

[0016] The right wheel-side drive system 2 includes a right wheel-side drive system clutch 2-1, a right wheel-side drive system left support bearing 2-2, a right wheel-side drive system bevel gear 2-3, a right wheel-side drive system driving spur gear 2-6, a right wheel-side drive system driven spur gear 2-7, a right wheel-side drive system right support bearing 2-4, and a right wheel-side drive system main drive motor 2-5. The right wheel-side drive system 2 is supported on the housing by the right wheel-side drive system left support bearing 2-2 and the right wheel-side drive system right support bearing 2-4.

[0017] The right-hand drive system 5 includes a left support bearing 5-3, a right support bearing 5-8, a power transmission assembly 5-11 with a driving bevel gear system, a drive system assembly 5-2 with a driven bevel gear, a drive system assembly 5-5 with a driven bevel gear, a drive system assembly 5-7 with a driven bevel gear, a drive system assembly 5-10 with a driven bevel gear, and right-hand drive system support bearings 5-1, 5-4, 5-6, and 5-9. The right-hand drive system 5 is supported on the housing by the left support bearing 5-3 and the right support bearing 5-8.

[0018] The left-side driving system 6 includes a left-side driving system left support bearing 6-3, a left-side driving system right support bearing 6-8, a power transmission assembly 6-11 with a driving bevel gear system, a driving system assembly 6-1 with a driven bevel gear, a driving system assembly 6-4 with a driven bevel gear, a driving system assembly 6-6 with a driven bevel gear, a driving system assembly 6-9 with a driven bevel gear, a left-side driving system support bearing 6-2, a left-side driving system support bearing 6-5, a left-side driving system support bearing 6-7, and a left-side driving system support bearing 6-10. The left-side driving system 6 is supported on the housing by the left-side driving system left support bearing 6-3 and the left-side driving system right support bearing 6-8.

[0019] The specific operating modes of this invention are: dual-motor pure electric mode, single-motor pure electric mode, three-motor high-torque pure electric mode, range-extended drive mode, hybrid drive mode, etc., which can be switched in a timely manner according to the driving conditions and performance requirements of the vehicle.

[0020] This invention patent utilizes different power flow modes. When only the left-wheel drive system main drive motor 4-5 and the right-wheel drive system main drive motor 2-5 are working, the vehicle not only has a pure electric silent driving function but also a U-turn function. When the vehicle needs to climb a 70% gradient and requires high torque output, there are two power flow modes: one is a pure electric high torque mode, specifically, the M1 drive motor 1-4 is engaged in the drive mode, providing assistance to the left-wheel drive system main drive motor 4-5 and the right-wheel drive system main drive motor 2-5; the other is a hybrid mode, where the engagement and disengagement of the engine clutch 1-3 controls the intervention of engine power.

[0021] In this embodiment, when the vehicle is in pure electric operation, the engine clutch 1-3 is disengaged. When the M1 drive motor clutch 1-5 is disengaged, the vehicle achieves pure electric silent driving under the dual-motor drive of the left-wheel drive system main drive motor 4-5 and the right-wheel drive system main drive motor 2-5. When the left-wheel drive system main drive motor 4-5 and the right-wheel drive system main drive motor 2-5 activate the differential function mode, the vehicle can achieve on-the-spot turning or even U-turn. When the vehicle is traveling on a straight road with low power demand, the left-wheel drive system clutch 4-1 and the right-wheel drive system clutch 2-1 are disengaged, and the M1 drive motor clutch 1-5 is engaged. The M1 drive motor 1-4 drives the vehicle in pure electric silent driving through the central differential system 3. When the vehicle requires high torque pure electric silent driving, the M1 drive motor clutch 1-5 is engaged, and both the left-wheel drive system clutch 4-1 and the right-wheel drive system clutch 2-1 are engaged. All three drive motors participate in driving simultaneously, achieving high torque pure electric silent driving.

[0022] Specifically, when the vehicle is on a level road and requires low speed and low power, only the M1 drive motors 1-4 drive the vehicle; when the vehicle needs to turn around on the spot, the left wheel drive system main drive motor 4-5 and the right wheel drive system main drive motor 2-5 work, and the turn around on the spot is achieved through the differential function of the two motors; under pure electric high torque conditions, the M1 drive motors 1-4 can be selected to intervene.

[0023] In this embodiment, when the vehicle is traveling in the medium-to-high speed range, the engine clutch 1-3 is closed, the M1 drive motor clutch 1-5 is closed, and the left wheel-side drive system clutch 4-1 and the right wheel-side drive system clutch 2-1 are both disengaged. The vehicle drive is switched to the range-extended drive mode, and the engine 1-1 and the M1 drive motor 1-4 drive the vehicle in series.

[0024] In this embodiment, when the vehicle is traveling at high speed, the power system automatically switches to hybrid drive mode. Engine clutch 1-3 is engaged, M1 drive motor clutch 1-5 is engaged, and both left-wheel drive system clutch 4-1 and right-wheel drive system clutch 2-1 are engaged. Engine 1-1 operates, M1 drive motor 1-4 operates, and the main drive motors 4-5 and 2-5 of the left-wheel drive system operate, driving the vehicle forward at high speed.

[0025] In summary, the power transmission path of this patented vehicle is flexible, making it suitable for complex terrain. It features pure electric silent driving, U-turn capabilities, and the ability to output high torque when climbing a 70% gradient, better meeting various usage needs. It allows for flexible switching between single-motor, dual-motor, tri-motor, range-extended, and hybrid modes to meet special application requirements.

[0026] Finally, it should be noted that the above preferred embodiments are only used to illustrate the technical solutions of the present invention and are not intended to limit it. Although the present invention has been described in detail through the above preferred embodiments, those skilled in the art should understand that various changes can be made to it in form and detail without departing from the scope defined by the claims of the present invention.

Claims

1. A hybrid power transmission system for an eight-wheeled all-terrain special vehicle chassis, characterized in that: This includes a range-extender system, a left-wheel drive system, a center differential system, a right-wheel drive system, a right-hand drive system, and a left-hand drive system. The range extender system includes an engine, an engine clutch, a drive motor, a drive motor clutch, and a range extender system drive gear connected in sequence. The engine is a gasoline engine. The central differential system includes a differential assembly, which has a power input bevel gear. The power input bevel gear of the differential assembly meshes with the drive gear of the range extender system. The two output ends of the differential assembly are respectively powered to the left bevel gear and the right bevel gear of the central differential. The left-wheel drive system includes a left-wheel drive system main drive motor, a left-wheel drive system clutch, a left-wheel drive system driving spur gear, and a left-wheel drive system bevel gear connected in sequence. The left-wheel drive system bevel gear meshes with the left bevel gear of the central differential, and the left-wheel drive system driving spur gear meshes with the left-wheel drive system driven spur gear. The left driving system includes a left power transmission assembly and four left driving system assemblies corresponding to the four left wheels respectively. The left power transmission assembly is equipped with left active bevel gears corresponding to the four left driving system assemblies respectively. The left wheel side drive system passive spur gear is set on the left power transmission assembly. The four left driving system assemblies are each equipped with a left passive bevel gear. Each left passive bevel gear meshes with the corresponding left active bevel gear for transmission. The right wheel drive system includes a right wheel drive system main drive motor, a right wheel drive system clutch, a right wheel drive system driving spur gear, and a right wheel drive system bevel gear connected in sequence. The right wheel drive system bevel gear meshes with the right bevel gear of the central differential, and the right wheel drive system driving spur gear meshes with the right wheel drive system driven spur gear. The right-hand drive system includes a right power transmission assembly and four right-hand drive system components corresponding to the four right-hand wheels. The right power transmission assembly is equipped with right drive bevel gears corresponding to the four right-hand drive system components. The right-hand drive system driven spur gear is mounted on the right power transmission assembly. The four right-hand drive system components are each equipped with a right driven bevel gear, and each right driven bevel gear meshes with the corresponding right drive bevel gear for transmission.

2. The hybrid power transmission system for an eight-wheeled all-terrain special vehicle chassis according to claim 1, characterized in that: It also includes a housing, and the range extender system, central differential system, left wheel-side drive system, right wheel-side drive system, left driving system, and right driving system are each supported on the housing by bearings.

3. The hybrid power transmission system for an eight-wheeled all-terrain special vehicle chassis according to claim 1, characterized in that: The left and right power transmission components each include a transmission rod arranged along the vehicle's travel direction, and each of the left driving bevel gear, right driving bevel gear, left wheel-side drive system driven spur gear, and right wheel-side drive system driven spur gear is mounted on the corresponding transmission rod.

4. The hybrid power transmission system for an eight-wheeled all-terrain special vehicle chassis according to claim 3, characterized in that: The driven spur gears of the left wheel-side drive system and the right wheel-side drive system are respectively installed in the middle of the corresponding transmission rods.

5. A method for operating the hybrid power transmission system of the eight-wheel all-terrain special vehicle chassis as described in claim 1, characterized in that: Dual-motor pure electric mode: The engine clutch and the drive motor clutch are both disengaged, and the main drive motor of the left wheel-side drive system and the main drive motor of the right wheel-side drive system work simultaneously; when the main drive motor of the left wheel-side drive system and the main drive motor of the right wheel-side drive system rotate in the same direction, the whole vehicle achieves pure electric silent driving. When the main drive motor of the left wheel drive system rotates at a different speed from the main drive motor of the right wheel drive system, the vehicle can steer. Single-motor pure electric mode: The engine clutch is disengaged, the drive motor clutch is engaged, and the clutches of the left wheel-side drive system and the right wheel-side drive system are both disengaged. The vehicle is driven only by the drive motor through the central differential system, which is suitable for low-power demand conditions on flat roads. Three-motor high-torque pure electric mode: The drive motor clutch, the left wheel drive system clutch and the right wheel drive system clutch are all closed, and the drive motor, the main drive motor of the left wheel drive system and the main drive motor of the right wheel drive system participate in driving at the same time to achieve high-torque pure electric silent driving. Range-extended drive mode: The engine clutch and drive motor clutch are engaged, while the left wheel-side drive system clutch and the right wheel-side drive system clutch are disengaged. The engine and drive motor drive the vehicle in series, which is suitable for driving in the medium and high speed range. Hybrid drive mode: The engine clutch, drive motor clutch, left wheel drive system clutch and right wheel drive system clutch are all closed. The engine, drive motor, left wheel drive system main drive motor and right wheel drive system main drive motor work together to drive the vehicle forward at high speed or to cope with heavy load climbing conditions.

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