Hydraulic driving structure of four-wheel-drive all-terrain low-speed vehicle

Abstract

The utility model relates to a hydraulic driving structure of a four-wheel-drive all-terrain low-speed vehicle, which comprises a vehicle frame, an engine arranged on the vehicle frame, four wheels rotationally assembled on the vehicle frame, a hydraulic oil pump, four hydraulic motors and a plurality of hydraulic oil pipes, the hydraulic oil pump is fixedly mounted on the frame, is in transmission connection with the output end of the engine and is provided with an oil outlet and an oil return port; the hydraulic motors are assembled on a left front wheel, a right front wheel, a left rear wheel and a right rear wheel respectively and used for driving the corresponding wheels, and an oil cavity of each hydraulic motor and the hydraulic oil pump form a loop through a hydraulic oil pipe. The four-wheel drive of the all-terrain low-speed vehicle is realized by adopting a hydraulic transmission mode.

Description

Technical Field

[0001] The utility model belongs to the technical field of all-terrain vehicles, and particularly relates to a hydraulic drive structure of a four-wheel drive all-terrain low-speed vehicle. Background Art

[0002] An all-terrain vehicle refers to a vehicle that can travel on any terrain and move freely on terrains where ordinary vehicles are difficult to maneuver. Because its structure is very similar to that of a motorcycle and many components are common with motorcycles, it is also called a "four-wheel motorcycle" by some people. This type of vehicle has multiple uses and is not restricted by road conditions.

[0003] Currently, most common all-terrain vehicles continue the traditional drive form, that is, the fuel tank is connected to the transmission through a clutch and a gearbox, especially a mechanical gearbox or a continuously variable transmission, to transmit power to the transfer case, and then the transfer case transmits power to the front and rear axle differentials, and then the differentials transmit power to the four wheels through the half shafts. However, because the common application scenarios of all-terrain vehicles are mostly grassland grazing, beach and farm tourism, snow hunting, snow clearing in northern communities, etc., and have the characteristics of relatively complex terrains for driving and mostly moving at low speeds for most of the time, this makes the traditional transmission method have the following defects for all-terrain vehicles:

[0004] First, the traditional drive structure is relatively complex. When facing complex terrains, especially terrains with many bumps and ups and downs, the precise and complex mechanical transmission structure is very easy to be damaged, resulting in the inadaptability of all-terrain vehicles with traditional drive structures to the actual application scenarios of all-terrain vehicles;

[0005] Second, vehicles with traditional drive methods have relatively high requirements for the driving skills of drivers. However, the road conditions of the common application scenarios of all-terrain vehicles are not complex and the moving speed is low, and professional driving skills are not required for drivers, resulting in the unfavorable promotion of all-terrain vehicles with traditional drive methods;

[0006] Third, the moving speed of all-terrain vehicles is usually low. Using a complex traditional mechanical drive method results in large power losses. And when turning, the speed difference between the left and right wheels of all-terrain vehicles is small, and the role of the central differential in the traditional drive structure is limited, resulting in waste of resources;

[0007] Fourth, the production, use, and later maintenance or repair costs of the traditional drive structure are relatively high, which does not conform to the positioning of all-terrain vehicles, resulting in poor economic benefits of all-terrain vehicles with traditional drive structures.

[0008] Therefore, it is necessary to improve the drive method of all-terrain vehicles to conform to the positioning of all-terrain vehicles, reduce costs, improve structural strength and stability, and make all-terrain vehicles easy to operate. Summary of the Utility Model

[0009] The purpose of the utility model is to provide a hydraulic drive structure for a four-wheel drive all-terrain low-speed vehicle, aiming to solve the problem of incompatibility between the actual application of the all-terrain vehicle and the complex traditional drive structure in the prior art.

[0010] In order to solve the above problems, the present invention adopts the following technical solutions:

[0011] A hydraulic drive structure for a four-wheel drive, all-terrain, low-speed vehicle comprises a vehicle frame, an engine mounted on the frame, and four wheels rotatably mounted on the frame, a hydraulic oil pump, four hydraulic motors, and a controller; the hydraulic oil pump is fixedly mounted on the frame and connected to the output end of the engine, and has an oil outlet and an oil return port; each of the hydraulic motors is respectively mounted on four wheels to drive its corresponding wheel, and the oil chamber of each hydraulic motor forms a circuit with the hydraulic oil pump through a hydraulic oil pipe.

[0012] The beneficial effects of the present invention are as follows: it eliminates the mechanical gearbox, transfer case, drive axle and other structures in the traditional drive mode, and instead realizes four-wheel drive of the all-terrain vehicle by driving the four wheels separately through four hydraulic motors. The hydraulic motor is an actuator of the hydraulic system, which can convert the liquid pressure energy provided by the hydraulic oil pump into the mechanical energy of its output shaft, which is specifically expressed in the form of torque and speed. In the present invention, after the engine provides power to the hydraulic oil pump, the hydraulic oil pump supplies oil to the four hydraulic motors and then controls the rotation of the four wheels. Compared with the traditional drive mode, the structure is simpler, the transmission method is more direct, there is no precise mechanical connection relationship, there is no need to worry about the drive system in the vehicle being damaged when driving on complex terrain, the production cost is low, the maintenance method is simpler, and the learning cost of driving an all-terrain vehicle is also significantly reduced.

[0013] In addition, since the transfer case, drive axle, and a series of gear sets and rotating shafts are eliminated, the differential in the traditional drive method is no longer needed. When the all-terrain vehicle of the present invention needs to turn, the hydraulic oil pipes on both sides are subjected to different resistances due to the different pressure conditions of the wheels on both sides of the driving direction during the turning process, and ultimately the wheel speeds on both sides are different. Since the all-terrain vehicle moves slowly, the difference in the wheel speeds on both sides is low, and stable driving and turning can be achieved without a precise differential structure.

[0014] Furthermore, the wheel includes a wheel frame, a tire and a hub, one side of the wheel frame is hinged to the frame edge of the vehicle frame, the tire is rotatably sleeved on the other side of the wheel frame, and the hub is integrated into the inner ring of the tire; the mounting end of the hydraulic motor is fixedly connected to the wheel frame, and the output end of the hydraulic motor is transmission-connected to the hub of the corresponding wheel.

[0015] A further beneficial effect of the present utility model is that the assembly of the wheel and the hydraulic motor is completed by arranging a wheel carrier. The tire is rotatably sleeved at one end of the wheel carrier to ensure smooth rotation. The other side of the wheel carrier is hinged to the side of the frame to ensure smooth steering of the wheel. At the same time, the wheel carrier is also responsible for providing an assembly position for the hydraulic motor to ensure that the output end of the hydraulic motor can smoothly drive the wheel hub of the wheel.

[0016] Further, each hydraulic motor has a housing, a stator-rotor pair, and an output shaft. The housing is fixedly connected to the wheel carrier. The stator-rotor pair is rotatably assembled in the housing and is driven by hydraulic oil. One end of the output shaft is fixedly connected to the rotor in the stator-rotor pair. The wheel carrier is provided with an output shaft assembly hole penetrating through it. The other end of the output shaft passes through the output shaft assembly hole and is in transmission connection with the wheel hub of the wheel. The housing has an oil port A and an oil port B. The oil port A and the oil port B respectively form a circuit with the oil outlet and the oil return port of the hydraulic oil pump through hydraulic oil pipes.

[0017] A further beneficial effect of the present utility model is that it specifically defines the assembly method of the hydraulic motor and the wheel carrier. The hydraulic motor and the wheel are respectively assembled on both sides of the wheel carrier, which can balance the counterweight on both sides of the wheel carrier to a certain extent. The output shaft assembly hole provided on the wheel carrier can ensure that the output shaft of the hydraulic motor is smoothly connected to and drives the wheel hub without interference with the wheel carrier itself.

[0018] Further, it further includes an electromagnetic reversing valve. The electromagnetic reversing valve has an oil port C, an oil port D, an oil port c, and an oil port d. The oil outlet of the hydraulic oil pump is communicated with the oil port C through a hydraulic oil pipe. The oil return port of the hydraulic oil pump is communicated with the oil port D through a hydraulic oil pipe. The oil port A of multiple hydraulic motors is respectively communicated with the oil port c through multiple hydraulic oil pipes. The oil port B of multiple hydraulic motors is respectively communicated with the oil port d through multiple hydraulic oil pipes.

[0019] A further beneficial effect of the present utility model is that an electromagnetic reversing valve is arranged in the entire hydraulic circuit. Since the hydraulic motor is reversible, the oil port A and the oil port B of the hydraulic motor can both serve as the oil inlet and the oil outlet. When the directions of the inlet and outlet oil are different, the rotation direction of the output shaft of the hydraulic motor is also different. Therefore, by arranging an electromagnetic reversing valve in the circuit, the flow direction of the hydraulic oil in the entire circuit can be controlled, and thus the rotation direction of the hydraulic motor can be controlled to realize the forward and reverse gears of the all-terrain vehicle.

[0020] Furthermore, it further includes an oil circuit distribution block which is fixedly installed on the vehicle frame and has an oil collecting end and an oil distributing end. The oil collecting end of the oil circuit distribution block is communicated with the oil ports c and d of the electromagnetic reversing valve through hydraulic oil pipes, and the oil distributing end of the oil circuit distribution block is respectively communicated with the oil ports A and B of the four hydraulic motors through multiple hydraulic oil pipes.

[0021] A further beneficial effect of the present utility model is that by providing an oil circuit distribution block to assist in evenly distributing the oil circuit to the four hydraulic motors. Since the medium outlets of a conventional electromagnetic reversing valve are limited, forming a circuit with four hydraulic motors simultaneously will make the internal structure responsible for conversion in the electromagnetic reversing valve complex, increasing the production and manufacturing cost. Therefore, an additional oil circuit distribution block is provided to assist in distribution. The oil collecting end of the oil circuit distribution block is responsible for communicating with the electromagnetic reversing valve to receive the hydraulic oil from the electromagnetic reversing valve, and then distributes it or receives the return oil discharged from the distribution end by the hydraulic motors, concentrates it, and sends it back to the electromagnetic reversing valve.

[0022] Furthermore, the oil collecting end of the oil circuit distribution block includes an oil port E and an oil port F, and the oil distributing end of the oil circuit distribution block includes four oil ports e and four oil ports f.

[0023] The oil port E and the oil port F are respectively communicated with the oil port c and the oil port d of the electromagnetic reversing valve through a hydraulic oil pipe; the four oil ports e are respectively communicated with the oil ports A of the four hydraulic motors through multiple hydraulic oil pipes; the four oil ports f are respectively communicated with the oil ports B of the four hydraulic motors through hydraulic oil pipes; and the four oil ports e are all communicated with the oil port E, and the four oil ports f are all communicated with the oil port F.

[0024] A further beneficial effect of the present utility model is that it specifically defines the connection conditions of the oil collecting end and the oil distributing end in the oil circuit distribution block. The oil port E and the oil port F of the oil collecting end are respectively communicated with the oil port c and the oil port d of the electromagnetic reversing valve. Due to the characteristics of the electromagnetic reversing valve, by switching gears, the oil port c and the oil port d can also be used as the oil outlet and the return oil port respectively. When the oil port c is used as the oil outlet, the oil port E is used to receive the hydraulic oil from the electromagnetic reversing valve, and then it is distributed to the oil ports A of the four hydraulic motors through the four oil ports e connected thereto. At this time, the oil port A is the oil inlet of the hydraulic motor, and the oil port B is the oil outlet of the hydraulic motor. The hydraulic oil is sent back to the oil circuit distribution block through the connected oil port f. At this time, the oil port F is used to concentrate the hydraulic oil discharged from the hydraulic motor and send it back to the electromagnetic reversing valve. At this time, the oil port d of the electromagnetic reversing valve is used as the return oil port. After switching the gears of the electromagnetic reversing valve, the functions of the oil port c and the oil port d, the oil port E and the oil port F, and the oil port A and the oil port B are interchanged, realizing the change of the oil circuit direction and thereby realizing the reverse rotation of the hydraulic motor.

[0025] Further, an installation beam is centrally arranged along the width direction inside the vehicle frame, and the hydraulic oil pump, the electromagnetic reversing valve, and the oil circuit distribution block are fixedly installed on the installation beam in sequence from back to front.

[0026] A further beneficial effect of the present utility model is that each component of the hydraulic drive is centrally arranged on the vehicle frame, so that the transmission efficiency of the hydraulic oil to the hydraulic motors on the left and right sides of the vehicle frame is consistent, which is convenient for ensuring the balance during driving.

[0027] Further, the pipe body of the hydraulic oil pipe is arranged along the surface of the vehicle frame.

[0028] In summary, the present utility model provides a hydraulic drive structure for a four-wheel drive all-terrain low-speed vehicle, which has the following significant improvements compared with the all-terrain vehicle adopting the traditional drive mode:

[0029] First, the drive mode is simple and reliable. When facing complex terrains, especially terrains with many bumps and many uphill and downhill slopes, it is not easy to be damaged.

[0030] Second, the operation mode is simple, the driving difficulty is low, the driving skills requirements for the driver are not high, which significantly reduces the learning cost and is conducive to popularization.

[0031] Third, when turning, by using the different resistance sizes of the hydraulic oil pipes on both sides, the rotational speeds of the wheels on both sides can be adjusted adaptively, and a precise and complex structure such as a central differential is not required.

[0032] Fourth, the production, use, and later maintenance or repair costs are low, which effectively improves the economic benefits. Description of the Drawings

[0033] Figure 1 It is an overall schematic diagram of a hydraulic drive structure for a four-wheel drive all-terrain low-speed vehicle provided by the present utility model;

[0034] Figure 2 It is a top view of a hydraulic drive structure for a four-wheel drive all-terrain low-speed vehicle provided by the present utility model;

[0035] Reference Signs:

[0036] 1. Hydraulic oil pump; 101. Oil outlet; 102. Oil return port;

[0037] 2. Hydraulic motor; 201. Oil port A; 202. Oil port B;

[0038] 3. Wheel frame;

[0039] 4. Electromagnetic reversing valve; 401. Oil port C; 402. Oil port D; 403. Oil port c; 404. Oil port d;

[0040] 5. Oil circuit distribution block; 501. Oil port E; 502. Oil port F; 503. Oil port e; 504. Oil port f. Detailed implementation manner

[0041] The following will clearly and completely describe the technical solutions in the embodiments of the present utility model with reference to the accompanying drawings in the embodiments of the present utility model. Obviously, the described embodiments are only a part of the embodiments of the present utility model, rather than all the embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present utility model.

[0042] A hydraulic drive structure of a four-wheel drive all-terrain low-speed vehicle includes a vehicle frame and four wheels rotatably assembled on the vehicle frame, and further includes a hydraulic oil pump 1, a driving part, a plurality of hydraulic oil pipes and a controller; the hydraulic oil pump 1 is fixedly installed on the vehicle frame and connected to the engine, and has an oil outlet 101 and an oil return port 102. The driving part consists of four hydraulic motors 2. The oil chambers of each hydraulic motor 2 are respectively connected to the hydraulic oil pump 1 through hydraulic oil pipes to form a circuit. The output ends of the four hydraulic motors 2 are respectively drivingly connected to the left front wheel, the right front wheel, the left rear wheel and the right rear wheel. The controller is electrically connected to the hydraulic oil pump 1 and the hydraulic motors 2.

[0043] With the above structure, the structures such as the mechanical gearbox, transfer case, and drive axle in the traditional drive mode are cancelled, and the four-wheel drive of the all-terrain vehicle is realized by driving the four wheels respectively through the four hydraulic motors 2. The hydraulic motor 2 is an actuator of the hydraulic system, which can convert the liquid pressure energy provided by the hydraulic oil pump 1 into the mechanical energy of its output shaft, and is specifically manifested in the form of torque and speed. In the present utility model, after the engine provides power for the hydraulic oil pump 1, the hydraulic oil pump 1 supplies oil to the four hydraulic motors 2 to control the rotation of the four wheels respectively. Compared with the traditional drive mode, the structure is simpler, the transmission mode is more direct, there is no precise mechanical connection relationship, there is no need to worry about damaging the drive system in the vehicle when driving on complex terrains, the production and manufacturing cost is low, the maintenance method is simpler, and the learning cost of driving the all-terrain vehicle is also significantly reduced.

[0044] In addition, since the transfer case, drive axle and a series of gear sets and rotating shafts and other structures are cancelled, the differential in the traditional drive mode is no longer needed. When the all-terrain vehicle of the present utility model needs to turn, due to the different pressure conditions of the wheels on both sides of the driving direction during the turning process, different resistances are exerted on the hydraulic oil pipes on both sides, and finally the rotational speeds of the wheels on both sides are different. Since the moving speed of the all-terrain vehicle is relatively slow, the difference in the rotational speeds of the wheels on both sides is relatively low, and stable driving and turning can be achieved without a precise differential structure.

[0045] To further improve the technical solution, it further includes a plurality of wheel carriers 3. The number of the wheel carriers 3 corresponds to that of the wheels one by one. One side of each wheel carrier 3 is hinged to the vehicle frame, and the tire of each wheel is rotatably sleeved on the other side of its corresponding wheel carrier 3. The mounting end of the hydraulic motor 2 is fixedly connected to the frame body of the wheel carrier 3 through a flange, and the output end of the hydraulic motor 2 is in transmission connection with the hub of its corresponding wheel.

[0046] The assembly of the wheels and the hydraulic motor 2 is completed by setting the wheel carrier 3. The tire is rotatably sleeved at one end of the wheel carrier 3 to ensure smooth rotation. The other side of the wheel carrier 3 is hinged to the side of the vehicle frame to ensure smooth steering of the wheels. At the same time, the wheel carrier 3 is also responsible for providing an assembly position for the hydraulic motor 2 to ensure that the output end of the hydraulic motor 2 can smoothly drive the hub of the wheel.

[0047] To further improve the technical solution, each hydraulic motor 2 has a housing, a stator-rotor pair, and an output shaft. The housing is fixedly connected to the wheel carrier 3; the stator-rotor pair is rotatably assembled in the housing and is driven by hydraulic oil. One end of the output shaft is fixedly connected to the rotor in the stator-rotor pair.

[0048] The working principle and basic structure of the hydraulic motor 2 belong to the prior art. The internal structure and working principle of the hydraulic motor 2 are not improved in the present utility model and will not be elaborated here. The wheel carrier 3 is provided with an output shaft assembly hole penetrating through it. The other end of the output shaft passes through the output shaft assembly hole and is in transmission connection with the hub of the wheel; the housing has an oil port A201 and an oil port B202. The oil port A201 and the oil port B202 respectively form a circuit with the oil outlet 101 and the oil return port 102 of the hydraulic oil pump 1 through hydraulic oil pipes. The hydraulic motor 2 and the wheel are respectively assembled on both sides of the wheel carrier 3, which can balance the weights on both sides of the wheel carrier 3 to a certain extent. The output shaft assembly hole provided on the wheel carrier 3 can ensure that the output shaft of the hydraulic motor 2 is smoothly connected to and drives the hub of the wheel without interference with the wheel carrier 3 itself.

[0049] To further improve the technical solution, it further includes an electromagnetic directional control valve 4. The electromagnetic directional control valve 4 has an oil port C401, an oil port D402, an oil port c403, and an oil port d404. The oil outlet 101 of the hydraulic oil pump 1 is connected to the oil port C401 through a hydraulic oil pipe, and the oil return port 102 of the hydraulic oil pump 1 is connected to the oil port D402 through a hydraulic oil pipe. The oil ports A201 of multiple hydraulic motors 2 are respectively connected to the oil port c403 through multiple hydraulic oil pipes, and the oil ports B202 of multiple hydraulic motors 2 are respectively connected to the oil port d404 through multiple hydraulic oil pipes. Since the hydraulic motor 2 is reversible, the oil ports A201 and B202 of the hydraulic motor 2 can both serve as the oil inlet and the oil outlet 101. When the directions of the inlet and outlet oil are different, the rotation direction of the output shaft of the hydraulic motor 2 is also different. Therefore, by setting the electromagnetic directional control valve 4 in the circuit, the flow direction of the hydraulic oil in the whole circuit can be controlled, and then the rotation direction of the hydraulic motor 2 can be controlled to realize the forward and reverse gears of the all-terrain vehicle.

[0050] To further improve the technical solution, it further includes an oil circuit distribution block 5. The oil circuit distribution block 5 is fixedly installed on the vehicle frame and has an oil collecting end and an oil distributing end. The oil collecting end of the oil circuit distribution block 5 is connected to the oil ports c403 and d404 of the electromagnetic directional control valve 4 through a hydraulic oil pipe, and the oil distributing end of the oil circuit distribution block 5 is respectively connected to the oil ports A201 and B202 of the four hydraulic motors 2 through multiple hydraulic oil pipes. By setting the oil circuit distribution block 5, it is used to assist in evenly distributing the oil circuit to the four hydraulic motors 2. Since the medium outlets of the conventional electromagnetic directional control valve 4 are limited, and forming a circuit with the four hydraulic motors 2 will make the internal structure responsible for conversion in the electromagnetic directional control valve 4 complex and increase the production and manufacturing cost. Therefore, an additional oil circuit distribution block 5 is set to assist in distribution. The oil collecting end of the oil circuit distribution block 5 is responsible for connecting to the electromagnetic directional control valve 4 to receive the hydraulic oil from the electromagnetic directional control valve 4, and then distributes it or receives the return oil discharged from the hydraulic motor 2 at the distribution end, and after concentrating, sends it back to the electromagnetic directional control valve 4.

[0051] To further improve the technical solution, the oil collecting end of the oil circuit distribution block 5 includes an oil port E501 and an oil port F502, and the oil distributing end of the oil circuit distribution block 5 includes four oil ports e503 and four oil ports f504. Specifically, the oil circuit distribution block 5 can be regarded as two five-way joints integrated together. The four oil ports e503 are all connected to the oil port E501 through internal channels, and the four oil ports f504 are all connected to the oil port F502 through internal channels. The oil port E501 and the oil port F502 are respectively connected to the oil port c403 and the oil port d404 of the electromagnetic directional valve 4 through a hydraulic oil pipe; the four oil ports e503 are respectively connected to the oil port A201 of the four hydraulic motors 2 through multiple hydraulic oil pipes; the four oil ports f504 are respectively connected to the oil port B202 of the four hydraulic motors 2 through hydraulic oil pipes. By using the oil port E501 and the oil port F502 at the oil collecting end to connect to the oil port c403 and the oil port d404 of the electromagnetic directional valve 4 respectively, due to the characteristics of the electromagnetic directional valve 4, by switching gears, the oil port c403 and the oil port d404 can also be used as the oil outlet 101 and the oil return port 102 respectively. When the oil port c403 is used as the oil outlet 101, the oil port E501 is used to receive the hydraulic oil from the electromagnetic directional valve 4, and then it is distributed to the oil port A201 of the four hydraulic motors 2 through the four connected oil ports e503. At this time, the oil port A201 is the oil inlet of the hydraulic motor 2, and the oil port B202 is the oil outlet 101 of the hydraulic motor 2. The hydraulic oil is sent back to the oil circuit distribution block 5 through the connected oil port f504. At this time, the oil port F502 is used to collect the hydraulic oil discharged by the hydraulic motor 2 and send it back to the electromagnetic directional valve 4. At this time, the oil port d404 of the electromagnetic directional valve 4 is used as the oil return port 102. After switching the gears of the electromagnetic directional valve 4, the functions of the oil port c403 and the oil port d404, the oil port E501 and the oil port F502, and the oil port A201 and the oil port B202 are interchanged, realizing the change of the oil circuit direction and thus realizing the reverse rotation of the hydraulic motor 2.

[0052] To further improve the technical solution, an installation beam is centrally arranged along the width direction inside the vehicle frame. The hydraulic oil pump 1, the electromagnetic directional valve 4, and the oil circuit distribution block 5 are fixedly installed on the installation beam in sequence from the rear to the front, arranging each component of the hydraulic transmission centrally on the vehicle frame, making the transmission efficiency of the hydraulic oil to the hydraulic motors 2 on the left and right sides of the vehicle frame consistent, which is convenient for ensuring the balance during driving.

[0053] To further improve the technical solution, the pipe body of the hydraulic oil pipe is arranged along the surface of the vehicle frame, which is convenient for saving space.

[0054] Although the embodiments of the present invention have been shown and described, those of ordinary skill in the art can understand that various changes, modifications, substitutions, and variations can be made to these embodiments without departing from the principles and purposes of the present invention. The scope of the present invention is defined by the claims and their equivalents.

Claims

1. A hydraulic drive structure for a four-wheel drive all-terrain low-speed vehicle, comprising a vehicle frame, an engine mounted on the vehicle frame, and four wheels rotatably assembled on the vehicle frame, characterized in that, It also includes a hydraulic oil pump (1) and four hydraulic motors (2); The hydraulic oil pump (1) is fixedly installed on the vehicle frame and is in transmission connection with the output end of the engine, and has an oil outlet (101) and an oil return port (102); Each hydraulic motor (2) is respectively assembled on four wheels to drive the corresponding wheel, and the oil chambers of each hydraulic motor (2) respectively form a circuit with the hydraulic oil pump (1) through hydraulic oil pipes.

2. The hydraulic drive structure of a four-wheel drive all-terrain low-speed vehicle according to claim 1, characterized in that, The wheel includes a wheel frame (3), a tire and a wheel hub, One side of the wheel frame (3) is hinged to the vehicle frame, the tire is rotatably sleeved on the other side of the wheel frame (3), and the wheel hub is integrated in the inner ring of the tire; The installation end of the hydraulic motor (2) is fixedly connected to the wheel frame (3), and the output end of the hydraulic motor (2) is in transmission connection with the wheel hub of the corresponding wheel.

3. The hydraulic drive structure of a four-wheel drive all-terrain low-speed vehicle according to claim 2, characterized in that, Each hydraulic motor has a housing, a stator-rotor pair and an output shaft, The housing is fixedly connected to the side of the wheel frame (3) away from the wheel; the housing has an oil port A (201) and an oil port B (202), and the oil port A (201) and the oil port B (202) respectively form a circuit with the oil outlet (101) and the oil return port (102) of the hydraulic oil pump (1) through hydraulic oil pipes. The stator-rotor pair is rotatably assembled in the housing and is driven by hydraulic oil. One end of the output shaft is fixedly connected to the rotor in the stator-rotor pair; The wheel frame (3) is provided with an output shaft assembly hole penetrating through it, and the other end of the output shaft passes through the output shaft assembly hole and is in transmission connection with the wheel hub of the wheel.

4. The hydraulic drive structure of a four-wheel drive all-terrain low-speed vehicle according to claim 3, characterized in that, It also includes an electromagnetic directional valve (4), The electromagnetic directional valve (4) has an oil port C (401), an oil port D (402), an oil port c (403) and an oil port d (404). The oil outlet (101) of the hydraulic oil pump (1) is communicated with the oil port C (401) through a hydraulic oil pipe, and the oil return port (102) of the hydraulic oil pump (1) is communicated with the oil port D (402) through a hydraulic oil pipe; The oil ports A (201) of multiple hydraulic motors (2) are respectively communicated with the oil port c (403) through multiple hydraulic oil pipes, and the oil ports B (202) of multiple hydraulic motors (2) are respectively communicated with the oil port d (404) through multiple hydraulic oil pipes.

5. The hydraulic drive structure of a four-wheel drive all-terrain low-speed vehicle according to claim 4, characterized in that, It also includes an oil circuit distribution block (5), The oil circuit distribution block (5) is fixedly installed on the vehicle frame and has an oil collecting end and an oil distributing end. The oil collecting end of the oil circuit distribution block (5) is communicated with the oil port C (401) and the oil port D (402) of the electromagnetic directional valve (4) through hydraulic oil pipes. The oil distributing end of the oil circuit distribution block (5) is communicated with the oil ports A (201) and the oil ports B (202) of the four hydraulic motors (2) through multiple hydraulic oil pipes respectively.

6. The hydraulic drive structure of a four-wheel drive all-terrain low-speed vehicle according to claim 5, characterized in that, The oil collecting end of the oil circuit distribution block (5) includes an oil port E (501) and an oil port F (502), and the oil distributing end of the oil circuit distribution block (5) includes four oil ports e (503) and four oil ports f (504). The oil port E (501) and the oil port F (502) are respectively connected to the oil port c (403) and the oil port d (404) of the electromagnetic directional valve (4) through hydraulic oil pipes; the four oil ports e (503) are respectively connected to the oil port A (201) of the four hydraulic motors (2) through multiple hydraulic oil pipes; the four oil ports f (504) are respectively connected to the oil port B (202) of the four hydraulic motors (2) through hydraulic oil pipes; and the four oil ports e (503) are all connected to the oil port E (501), and the four oil ports f (504) are all connected to the oil port F (502).

7. The hydraulic drive structure of a four-wheel drive all-terrain low-speed vehicle according to claim 5, characterized in that, An installation beam is centrally arranged along the width direction inside the vehicle frame, and the hydraulic oil pump (1), the electromagnetic directional valve (4) and the oil circuit distribution block (5) are successively and fixedly installed on the installation beam.

8. The hydraulic drive structure of a four-wheel drive all-terrain low-speed vehicle according to any one of claims 1-7, characterized in that The pipe body of the hydraulic oil pipe is arranged along the surface of the vehicle frame.

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