CN115556571A

CN115556571A - All-wheel drive system based on one-way clutch

Info

Publication number: CN115556571A
Application number: CN202211023090.7A
Authority: CN
Inventors: 王国军; 刘博�; 丁波; 张仁杰; 贾继红
Original assignee: Army Military Transportation University
Current assignee: Army Military Transportation University
Priority date: 2022-08-24
Filing date: 2022-08-24
Publication date: 2023-01-03

Abstract

The application provides an all-wheel drive system based on one-way clutch, its characterized in that includes: the engine is used for providing driving force for the front wheels and the rear wheels, the transmission assembly is connected with the engine and used for changing the driving force of the engine and transmitting the driving force to the front drive axle assembly and the rear drive axle assembly, the front drive axle assembly is arranged between the two front wheels to provide the driving force for the front wheels, and the rear drive axle assembly is arranged between the two rear wheels to provide the driving force for the rear wheels. Through the cooperation of two one-way clutches and differential mechanism, realize four wheel drive and left and right wheel room, the real time differential mechanism between the axle to do not set up differential mechanism in the rear axle drive assembly, reduced vehicle transmission system complexity, practice thrift occupation space, improve vehicle maneuverability and topography adaptability.

Description

All-wheel drive system based on one-way clutch

Technical Field

The application relates to the technical field of vehicle power systems, in particular to an all-wheel drive system based on a one-way clutch.

Background

In order to meet the requirements of light weight, high maneuverability and trafficability of wheeled vehicles in various complex terrains, vehicle researchers at home and abroad are constantly dedicated to research and develop a driving system capable of operating in unstructured terrains. Among the off-road vehicles, widely used and early entering the industrial field are wheeled vehicles, which have the major advantage that they can stably move at high speed by means of relatively simple mechanisms and controls, with high transmission efficiency. In the case of a wheel-type vehicle, a driving system is an important basis of the whole vehicle system, and compared with a single-shaft driving power transmission system, the vehicle capable of being driven by all wheels has many advantages and wide application prospects.

The traditional light wheeled vehicle driving system comprises a front driving axle and a rear driving axle, wherein in order to realize four-wheel drive and unequal-speed rotation of a left wheel and a right wheel, the front driving axle and the rear driving axle are both provided with differentials, and a transfer case is matched with control structures such as a control lever, so that the complexity of a vehicle transmission system is greatly increased, the occupied space is also greatly increased, and the application range of the vehicle transmission system is greatly limited.

Disclosure of Invention

In view of the above, the present application aims to provide an all-wheel drive system based on a one-way clutch.

In view of the above, the present application provides an all-wheel drive system based on a one-way clutch, comprising: an engine for providing driving forces for front and rear wheels, a transmission assembly connected with the engine for varying the driving force of the engine and transmitting it to the front and rear axle assemblies, the front axle assembly being arranged between the two front wheels for providing driving forces to the front wheels, the rear axle assembly being arranged between the two rear wheels for providing driving forces to the rear wheels, wherein,

the front drive axle assembly comprises a front axle main speed reducer, a differential and a front axle one-way clutch, the front axle main speed reducer is connected with the transmission assembly, the differential is connected with the front axle main speed reducer, and the front axle one-way clutch is connected with the differential and the front wheels;

the rear drive axle assembly comprises a rear axle main speed reducer and a rear axle one-way clutch, the rear axle main speed reducer is connected with the transmission assembly, and the rear axle one-way clutch is connected with the rear axle main speed reducer and the rear wheels.

Furthermore, two front axle one-way clutches are arranged, and the two front axle one-way clutches are in one-to-one correspondence with and connected with the two front wheels.

Further, the front drive axle assembly further comprises a front axle half shaft, and the front axle one-way clutch is connected with the front wheel through the front axle half shaft.

Furthermore, the front axle one-way clutch comprises an inner ring, a connecting part and an outer ring which are connected in sequence, the outer ring is fixedly connected with the shell of the differential mechanism, and the inner ring is fixedly connected with the front axle half shaft.

Further, the front axle main reducer comprises a front axle driving gear and a front axle driven gear which are meshed with each other, the front axle driving gear is connected with the transmission assembly, and the front axle driven gear is connected with the differential mechanism.

Furthermore, two rear axle one-way clutches are arranged, and the two rear axle one-way clutches are in one-to-one correspondence with and connected with the two rear wheels.

Furthermore, the rear drive axle assembly further comprises a rear axle half shaft, and the rear axle one-way clutch is connected with the rear wheel through the rear axle half shaft.

Furthermore, the rear axle main reducer comprises a rear axle driving gear and a rear axle driven gear which are meshed with each other, the rear axle driving gear is connected with the transmission assembly, and the rear axle driven gear is connected with the rear axle one-way clutch.

Further, the transmission assembly includes:

a transmission connected with the engine;

the input shaft of the transfer case is connected with the transmission, and the rear output shaft of the transfer case is connected with the rear axle driving gear;

and one end of the transmission shaft is connected with the front output shaft of the transfer case, and the other end of the transmission shaft is connected with the front axle driving gear.

Further, the gear ratio of the front axle final drive is less than or equal to the gear ratio of the rear axle final drive.

From the above, it can be seen that the one-way clutch-based all-wheel drive system provided by the application realizes four-wheel drive and timely differential between left and right wheel wheels and between axles through adding the front axle one-way clutch in the front drive axle assembly and adding the rear axle one-way clutch in the rear drive axle assembly and matching of the two one-way clutches and the differential, and can be applied to light wheeled vehicles. And only the differential mechanism is arranged in the front drive axle assembly, the differential mechanism is not arranged in the rear drive axle assembly, and meanwhile, the operation structure of the transfer case is cancelled, so that the complexity of a vehicle transmission system is reduced, the occupied space is saved, and the vehicle operability and terrain adaptability are improved.

Drawings

In order to more clearly illustrate the technical solutions in the present application or the related art, the drawings needed to be used in the description of the embodiments or the related art will be briefly introduced below, and it is obvious that the drawings in the following description are only embodiments of the present application, and it is obvious for those skilled in the art that other drawings can be obtained according to these drawings without creative efforts.

FIG. 1 is a schematic structural diagram of an all-wheel drive system based on a one-way clutch according to an embodiment of the present application;

fig. 2 is a schematic structural diagram of a front axle one-way clutch according to an embodiment of the present application when connected to a housing.

In the figure: 1. an engine; 2. a transmission assembly; 21. a transmission; 22. a transfer case; 221. an input shaft; 222. a rear output shaft; 23. a drive shaft; 3. a front drive axle assembly; 31. a front axle main reducer; 311. a front axle drive gear; 312. a front axle driven gear; 32. a differential mechanism; 321. a housing; 322. a side gear; 323. a planetary gear; 33. a front axle one-way clutch; 331. an inner ring; 332. an outer ring; 333. a connecting portion; 34. a front axle half shaft; 4. a rear drive axle assembly; 41. a rear axle main reducer; 411. a rear axle driven gear; 412. a rear axle drive gear; 42. a rear axle shaft; 43. a rear axle one-way clutch; 5. a front wheel; 6. and a rear wheel.

Detailed Description

In order to make the objects, technical solutions and advantages of the present application more apparent, the present application is further described in detail below with reference to specific embodiments and the accompanying drawings.

It should be noted that technical terms or scientific terms used in the embodiments of the present application should have a general meaning as understood by those having ordinary skill in the art to which the present application belongs, unless otherwise defined. The use of "first," "second," and similar terms in the embodiments of the present application is not intended to indicate any order, quantity, or importance, but rather is used to distinguish one element from another. The word "comprising" or "comprises", and the like, means that the element or item listed before the word covers the element or item listed after the word and its equivalents, but does not exclude other elements or items. The terms "connected" or "coupled" and the like are not restricted to physical or mechanical connections, but may include electrical connections, whether direct or indirect. "upper", "lower", "left", "right", and the like are used only to indicate relative positional relationships, and when the absolute position of the object being described is changed, the relative positional relationships may also be changed accordingly.

Referring to fig. 1, the present application provides a one-way clutch based all-wheel drive system comprising: the driving device comprises an engine 1, a transmission assembly 2, a front driving axle assembly 3 and a rear driving axle assembly 4, wherein the engine 1 is used for providing driving force for front wheels 5 and rear wheels 6, the transmission assembly 2 is connected with the engine 1 and used for changing the driving force of the engine 1 and transmitting the driving force to the front driving axle assembly 3 and the rear driving axle assembly 4, the front driving axle assembly 3 is arranged between the two front wheels 5 so as to provide the driving force for the front wheels 5, and the rear driving axle assembly 4 is arranged between the two rear wheels 6 so as to provide the driving force for the rear wheels 6.

The front drive axle assembly 3 comprises a front axle main reducer 31, a differential 32 and a front axle one-way clutch 33, wherein the front axle main reducer 31 is connected with the transmission assembly 2, the differential 32 is connected with the front axle main reducer 31, and the front axle one-way clutch 33 is connected with the differential 32 and the front wheels 5;

the rear drive axle assembly 4 comprises a rear axle main speed reducer 41 and a rear axle one-way clutch 43, the rear axle main speed reducer 41 is connected with the transmission assembly 2, and the rear axle one-way clutch 43 is connected with the rear axle main speed reducer 41 and the rear wheel 6.

The differential 32 may be a symmetrical bevel gear differential, and includes planetary gears 323, planetary gear 323 shafts (cross shafts), side gears 322, a housing 321, and the like. The power of the engine 1 is transmitted to a front driving gear 311 of the front main speed reducer 31 through the transmission 21, the transfer case 22, and the transmission shaft 23, the front driving gear 311 continuously transmits the power to a front driven gear 312, and the front driven gear 312 is transmitted to the front wheel 5 through a housing 321, a planetary gear shaft, a planetary gear 323, a side gear 322, and a front axle half shaft 34 in sequence.

The motion states of the planetary gear 323 include two types: when the left and right front wheels 5 rotate at the same speed, the planetary gear 323 revolves around the axis of the front axle shaft 34. When the left and right front wheels 5 are subjected to different resistances, the planetary gear 323 revolves around the axis of the front axle half shaft 34 and rotates around the axis thereof, so that the two axle half gears 322 drive the wheels at two sides to rotate at different speeds, and the differential speed of the left and right front wheels 5 is realized.

Two front axle one-way clutches 33 are provided, and the two front axle one-way clutches 33 are connected with the two front wheels 5 in a one-to-one correspondence manner.

Wherein, the front drive axle assembly 3 further comprises a front axle half shaft 34, and the front axle one-way clutch 33 is connected with the front wheel 5 through the front axle half shaft 34. Specifically, there are two front axle shafts 34, and the front axle shafts 34 are connected to the two front axle one-way clutches 33 in a one-to-one correspondence. The front axle half shafts 34 may be constant velocity joints or quasi-constant velocity joints.

Referring to fig. 2, the front axle one-way clutch 33 includes an inner ring 331, a connecting portion 333, and an outer ring 332 connected in sequence, where the inner ring 331, the outer ring 332 and the connecting portion 333 are both rotationally connected, the outer ring 332 is fixedly connected with the casing 321 of the differential 32, and the inner ring 331 is fixedly connected with the front axle half shaft 34. In this embodiment, the connecting portion 333 may be a cage and a wedge block, the cage is used for supporting the wedge block, and the wedge block is connected with the inner ring 331 and the outer ring 332. Specifically, the wedge pieces are engaged with the inner ring 331 and the outer ring 332 only in a predetermined direction, and are not engaged in other directions.

Specifically, the one-way clutch functions to allow a component to rotate only in one direction, and lock in the other direction. When the power source drives the driven element, only one direction is used for driving, and if the power source changes the direction, the driven element is stopped. In the present application, the front axle one-way clutch 33 functions such that the driving force applied to the outer ring 332 can be transmitted to the inner ring 331 so that the inner ring 331 can rotate in a certain direction, but the driving force applied to the inner ring 331 cannot be transmitted to the outer ring 332 and cannot rotate the outer ring 332. That is, referring to fig. 2, the outer casing 321 of the differential 32 rotates to drive the outer ring 332 fixedly connected thereto to rotate, and the outer ring 332 rotates to drive the inner ring 331 to rotate, so that the inner ring 331 drives the front axle half shaft 34 connected thereto to rotate. However, the rotation of the inner ring 331 cannot rotate the outer ring 332 (the front axle one-way clutch 33 is in an idling state). In this embodiment, the one-way clutch may be a CK-X sprag one-way clutch of the shin-sun overrunning clutch limited.

The front axle main reducer 31 includes a front axle driving gear 311 and a front axle driven gear 312 engaged with each other, the front axle driving gear 311 is connected to the transmission assembly 2, and the front axle driven gear 312 is connected to the differential 32.

Two rear axle one-way clutches 43 are provided, and the two rear axle one-way clutches 43 are connected with the two rear wheels 6 in a one-to-one correspondence manner. The rear drive axle assembly 4 further comprises a rear axle half shaft 42, and the rear axle one-way clutch 43 is connected with the rear wheel 6 through the rear axle half shaft 42. Specifically, there are two rear axle half shafts 42, and the rear axle half shafts 42 are connected to the two rear axle one-way clutches 43 in a one-to-one correspondence. The rear axle half shafts 42 may be constant velocity joints or quasi-constant velocity joints.

Specifically, the rear axle one-way clutch 43 has the same structure as the front axle one-way clutch 33, and also includes an inner race, an outer race, and a connecting portion. The inner ring of the rear axle one-way clutch 43 is connected with the rear axle driven gear 411 of the rear axle main speed reducer 41, and the outer ring of the rear axle one-way clutch 43 is connected with the rear axle half shaft 42. Accordingly, the one-way rotation function of the rear axle one-way clutch 43 enables the rear axle driven gear 411 to drive the outer ring 332 of the rear axle one-way clutch 43 to rotate, and further drive the inner ring 331 and the rear axle half shaft 42 to rotate. However, the rotation of the inner ring 331 of the rear axle half shaft 42 and the rear axle one-way clutch 43 cannot drive the rotation of the outer ring 332 and the rear axle driven gear.

The rear axle main speed reducer 41 includes a rear axle driving gear 412 and a rear axle driven gear 411 engaged with each other, the rear axle driving gear 412 is connected to the transmission assembly 2, and the rear axle driven gear 411 is connected to the rear axle one-way clutch 43.

Wherein, transmission assembly 2 includes: a transmission 21 connected to the engine 1; a transfer case 22 having an input shaft 221 connected to the transmission 21 and a rear output shaft 222 connected to the rear axle drive gear 412; and one end of the transmission shaft 23 is connected with the front output shaft of the transfer case 22, and the other end of the transmission shaft is connected with the front axle driving gear 311.

Specifically, the engine 1 is connected to the transmission 21 via a flywheel. The transfer case 22 is disposed near the rear drive axle assembly 4, and the input shaft 221 and the rear output shaft 222 of the transfer case 22 are driven by a constant mesh gear.

The transmission shaft 23 is respectively engaged with the front output shaft and the front axle driving gear 311 through a bevel gear pair.

The transmission assembly 2 is used for changing the driving force of the engine 1 and transmitting the driving force to the front drive axle assembly 3 and the rear drive axle assembly 4, so that all-wheel drive is realized.

Wherein the gear ratio of the front drive axle assembly 3 is less than or equal to the gear ratio of the rear drive axle assembly 4.

Specifically, the vehicle may achieve four-wheel simultaneous drive when the gear ratio of the front drive axle assembly 3 is equal to the gear ratio of the rear drive axle assembly 4.

When the gear ratio of the front axle assembly 3 is smaller than the gear ratio of the rear axle assembly 4, specifically, the gear ratio of the front axle final drive 31 is smaller than the gear ratio of the rear axle final drive 41. The transmission ratio of the front axle main reducer 31 is smaller than that of the rear axle main reducer 41, so that when the engine provides certain driving force, due to the difference of the transmission ratios, the same driving force enables the front wheels and the rear wheels to have different rotating speeds, the rear axle can be involved to work when the front wheels 5 slide to a certain degree, and the time for the rear axle to be involved is related to the transmission ratio of the rear axle main reducer 41. And calculating the transmission ratio of the front axle main reducer according to the highest speed, and calculating the transmission ratio of the rear axle main reducer by combining the slip ratio of the front wheels 5. The slip ratio of the front wheels 5 is controlled by calculating and controlling the transmission ratio of the front axle main speed reducer 31 and the rear axle main speed reducer 41, so that the driving force and the lateral attachment of the vehicle are ensured.

The following formula is used as a reference basis for determining the transmission ratio of the front and rear axle main speed reducer 41 in the design process of the vehicle driving scheme:

u _{front side} ·i _{Front side} ＝u _{Rear end} ·i _{Rear end}

In the formula, s _{Front part} Is the slip rate of the front wheel, u _{Front part} Is the front wheel center speed u _{Rear end} Speed of the rear wheel center, i _{Front part} Is the front axle main reducer transmission ratio i _{Rear end} Is the transmission ratio of the rear axle main reducer.

The above formula shows a slip ratio calculation formula of the front wheels 5 with respect to the rear wheels 6 when the rear wheels 6 are operated. And (3) calculating the transmission ratio of a front axle main reducer 31 at the highest speed angle, and calculating the transmission ratio of a rear main reducer by taking the intervention of a rear wheel 6 when the slip ratio of a front wheel 5 is 20%. When the slip ratio of the front wheels 5 is controlled to be about 20%, the vehicle can obtain good lateral stability, and therefore the operation stability of the vehicle is improved.

The one-way clutch based all-wheel drive system described herein may include several operating modes:

the first mode is as follows: when the vehicle is normally running straight, the power of the engine 1 is transmitted to the transfer case 22 through the transmission 21, then transmitted to the front drive gear 311 of the front final drive 31 through the propeller shaft 23, and then transmitted to the front driven gear 312. Front axle driven gear 312 rotates outer case 321 of differential 32. Since the front wheels 5 on both sides of the front axle do not differentiate during normal running, the planetary gear 323 in the differential gear 32 does not spin. The rotation speed transmitted to the case 321 of the differential 32 is transmitted to the front wheels 5 sequentially via the planetary gear 323, the side gear 322 and the front axle shaft 34 to drive the two front wheels 5 to rotate at a constant speed, so that normal running is realized.

When the vehicle runs normally, the rotation speed of the front wheels 5 is higher than that of the rear wheels 6 when the transmission ratio of the front axle main reducer 31 is lower than that of the rear axle main reducer 41. However, during driving, the rear wheel 6 is dragged by the front wheel 5, so that the rear wheel 6 also rotates rapidly (the rotation speed of the rear wheel 6 is greater than that of the input rear wheel), at this time, the rotation speed of the rear wheel 6 transmitted to the inner ring 331 of the rear axle one-way clutch 43 through the rear axle half shaft 42 is greater, the rotation speed of the transfer case 22 transmitted to the outer ring 332 of the rear axle one-way clutch 43 through the rear axle main speed reducer 41 is smaller, and the rear axle one-way clutch 43 idles (also called slips) at this time because the inner ring 331 cannot drive the outer ring 332 to rotate, and does not act.

And a second mode: when the vehicle turns, power is transmitted to the transfer case 22 through the transmission 21, and then transmitted to the front drive axle assembly 3 through the propeller shaft 23, rotating the housing 321 of the differential 32 through the front axle driven gear 312. When the vehicle turns, the wheels on both sides of the front axle are in the unequal speed state, so the planetary gear 323 of the differential 32 starts to rotate, the rotating speed is transmitted to the planetary gear 323 through the shell 321 of the differential 32, and the two front axle half shafts 34 of the front drive axle assembly 3 are driven to rotate in unequal speed, so that the differential function of the two front wheels 5 is realized.

For the rear wheels 6, when the vehicle turns, the rotation speed of the rear wheels 6 with a large rear axle turning radius (hereinafter referred to as "fast rear wheels 6") is higher than the input rotation speed, so the rotation speed of the fast rear wheels 6 transmitted to the inner ring 331 of the rear axle one-way clutch 43 through the rear axle half shaft 42 is large, the rotation speed of the transfer case 22 transmitted to the outer ring 332 of the rear axle one-way clutch 43 through the rear axle main reducer 41 is small, and since the inner ring 331 cannot drive the outer ring 332 to rotate, the rear axle one-way clutch 43 corresponding to the fast rear wheels 6 idles (also called slipping) and does not act, and the rotation speed of the fast rear wheels 6 is still high. And a rear wheel 6 with a smaller turning radius of the rear axle (hereinafter referred to as "slow rear wheel 6") is normally transmitted to the rear axle main speed reducer 41 by the power of the engine 1, the rear axle main speed reducer 41 drives the outer ring 332 of the rear axle one-way clutch 43 to rotate, the outer ring 332 drives the inner ring 331 to rotate, and the inner ring 331 drives the rear axle half shaft 42 connected with the inner ring 331 to rotate, so as to drive the slow rear wheel 6 to rotate. At this time, the rotation speed of the slow rear wheel 6 is equal to the input rotation speed, and the rotation speed of the fast rear wheel 6 is greater than the input rotation speed, so that the differential function of the two rear wheels 6 is realized.

In the present application, the rear axle one-way clutch 43 is provided to replace the differential 32 of the rear axle in the transmission all-wheel drive system, thereby realizing the differential function between the two rear wheels 6. The differential 32 with larger volume and complex structure can be replaced by the rear axle one-way clutch 43 with smaller volume to realize the same function, thereby greatly reducing the complexity of the whole driving system and the occupied space of the whole system.

And a third mode: the differential non-differential torque characteristic of differential 32 causes the grounded wheels to not draw torque from differential 32 when a single front wheel is suspended. At this time, the front axle one-way clutch 33 disposed on the housing 321 of the differential gear 32 is engaged, the power of the front axle final drive 31 is transmitted to the housing 321 of the differential gear 32, and the housing 321 of the differential gear 32 drives the front axle one-way clutch 33 connected thereto to rotate, so that the ground contact wheels obtain the same torque as the housing 321 of the differential gear 32.

When the drive power that the unsettled wheel of current transaxle subassembly 3 provided is not enough, the rotational speed of front wheel 5 is slower, consequently, front wheel 5 can't continue to drag rear wheel 6 and rotate, the rotational speed of rear wheel 6 is mainly transmitted to rear axle final drive 41 by engine 1 in proper order this moment, rear axle one way clutch 43, two rear axle one way clutch 43 all normally work this moment, make two rear axle semi-axes 42 all obtain moment about the rear axle, control two rear wheels 6 and all can rotate, the cooperation front wheel 5 unsettled wheel rotates together, in order to provide sufficient power to break away from the unsettled state of single wheel, make the vehicle can continue normally to travel.

In this application, front wheel 5 one way clutch's setting, differential 32 has been solved and has made the wheel that lands can not obtain the torque from differential 32 and then cause the unable pivoted problem of wheel that lands, the wheel that can not land for the front axle through front axle one way clutch 33 provides drive power, and simultaneously, two rear axle one way clutch 43 provide the drive for two rear wheels 6, and then make other three wheels that land all obtain drive power, total drive power is enough to drive the vehicle and breaks away from the unsettled state of single wheel, make the vehicle continue normally to travel. The front axle one-way clutch 33 and the rear axle one-way clutch 43 are cooperatively arranged, so that the whole vehicle can run more stably.

And a fourth mode: when the vehicle is in reverse, the torque transmitted from the transmission 21 reaches the front axle half shaft 34 through the transmission shaft 23, the front axle final drive 31 and the differential 32, and is opposite to the direction which can transmit the torque and is defined by the front axle one-way clutch 33, and at this moment, the front axle one-way clutch 33 does not transmit the torque. The torque revolves around the planetary gear 323 via the casing 321 of the differential 32, thereby rotating the side gear 322, transmitting the torque to the front axle half shaft 34 and then to the front wheel 5, so that the front axle has a reverse function.

From the above, it can be seen that the one-way clutch-based all-wheel drive system provided by the application realizes four-wheel drive and timely differential between wheels and axles of left and right wheels by adding the front one-way clutch 33 in the front drive axle assembly 3 and adding the rear one-way clutch 43 in the rear drive axle assembly 4 and by matching the two one-way clutches with the differential 32. And only the differential 32 is arranged in the front drive axle assembly 3, the differential 32 is not arranged in the rear drive axle assembly 4, and the operation structure of the transfer case 22 is cancelled, so that the complexity of a vehicle transmission system is reduced, the occupied space is saved, and the vehicle operability and terrain adaptability are improved.

The rear axle differential 32 is replaced by the rear axle one-way clutch 43, so that automatic conversion of a four-wheel drive mode is realized, the complexity of a vehicle driving system is reduced, the purpose of simplifying the design of a four-wheel drive structure is achieved, and the maneuverability and terrain adaptability of the vehicle are improved.

It should be noted that the above describes some embodiments of the disclosure. Other embodiments are within the scope of the following claims. In some cases, the actions or steps recited in the claims may be performed in a different order than in the embodiments described above and still achieve desirable results. In addition, the processes depicted in the accompanying figures do not necessarily require the particular order shown, or sequential order, to achieve desirable results. In some embodiments, multitasking and parallel processing may also be possible or may be advantageous.

Those of ordinary skill in the art will understand that: the discussion of any embodiment above is meant to be exemplary only, and is not intended to intimate that the scope of the disclosure, including the claims, is limited to these examples; within the concept of the present disclosure, also technical features in the above embodiments or in different embodiments may be combined, steps may be implemented in any order, and there are many other variations of the different aspects of the embodiments of the present disclosure as described above, which are not provided in detail for the sake of brevity.

The disclosed embodiments are intended to embrace all such alternatives, modifications and variances which fall within the broad scope of the appended claims. Therefore, any omissions, modifications, equivalents, improvements, and the like that may be made without departing from the spirit or scope of the embodiments of the present disclosure are intended to be included within the scope of the disclosure.

Claims

1. An all-wheel drive system based on a one-way clutch, comprising: an engine for providing driving force to front and rear wheels, a drive assembly connected to the engine for varying the driving force of the engine and transmitting it to the front and rear drive axle assemblies, the front drive axle assembly being disposed between the two front wheels to provide driving force to the front wheels, the rear drive axle assembly being disposed between the two rear wheels to provide driving force to the rear wheels, wherein,

2. The all-wheel drive system according to claim 1, wherein there are two front axle one-way clutches, and two front axle one-way clutches are connected in one-to-one correspondence with two front wheels.

3. The all-wheel drive system of claim 1, wherein the front drive axle assembly further comprises a front axle half shaft, the front axle one-way clutch being connected to the front wheels through the front axle half shaft.

4. The all-wheel drive system according to claim 3, wherein the front axle one-way clutch comprises an inner ring, a connecting portion and an outer ring connected in sequence, the outer ring being fixedly connected to the housing of the differential, the inner ring being fixedly connected to the front axle half shaft.

5. The all-wheel drive system according to claim 1, wherein the front axle final drive comprises a front axle driving gear and a front axle driven gear meshed with each other, the front axle driving gear being connected with the transmission assembly, the front axle driven gear being connected with the differential.

6. The all-wheel drive system according to claim 1, wherein there are two rear axle one-way clutches, and two rear axle one-way clutches are connected in one-to-one correspondence with the two rear wheels.

7. The all-wheel drive system of claim 1, wherein the rear drive axle assembly further comprises a rear axle half shaft, the rear axle one-way clutch being connected to the rear wheels through the rear axle half shaft.

8. The all-wheel drive system according to claim 1, wherein the rear axle final drive comprises a rear axle driving gear and a rear axle driven gear meshed with each other, the rear axle driving gear being connected with the transmission assembly, the rear axle driven gear being connected with the rear axle one-way clutch.

9. All-wheel drive system according to claim 8, wherein the transmission assembly comprises:

a transmission connected with the engine;

10. The all-wheel drive system according to claim 1, wherein a gear ratio of the front axle final drive is less than or equal to a gear ratio of the rear axle final drive.