CN114802462B - an all-terrain vehicle - Google Patents

Abstract

The invention provides an all-terrain vehicle, comprising a vehicle frame, a power assembly, a rear wheel system, a rear suspension structure, a front wheel system, a steering system, a front suspension structure and a braking system, and the vehicle frame includes a front bracket of the vehicle body , the rear bracket of the vehicle body and the U-shaped longitudinal beam, the power assembly is installed in the power cabin for driving the movement of the rear wheel system, the steering system is installed in the cockpit for driving the steering of the front wheel system, The brake system is installed on the front wheel system for braking the front wheel system, the rear suspension structure is connected to the rear wheel system and the vehicle frame, and the front suspension structure is connected to For the front wheel system and the front bracket of the vehicle body, the front suspension structure is a double-wishbone suspension, and the rear suspension structure is a multi-link suspension. The invention can improve driving comfort and controllability.

Description

an all-terrain vehicle

【Technical field】

The invention relates to an all-terrain vehicle.

【Background technique】

All-terrain vehicles have good off-road performance. The large front tires can increase the contact area with the ground, generate greater friction and reduce the pressure of the vehicle on the ground, making it easy to drive on beaches, river beds, forest roads, streams, and harsh conditions. desert terrain. Due to the complex and harsh conditions of use, it is necessary to provide an all-terrain vehicle to improve driving comfort and handling.

【Content of invention】

The technical problem to be solved by the present invention is to provide an all-terrain vehicle that can improve driving comfort and handling.

To achieve the above object, the technical solution of the present invention is:

An all-terrain vehicle, comprising a vehicle frame, a power assembly, a rear wheel system, a rear suspension structure, a front wheel system, a steering system, a front suspension structure and a braking system, the vehicle frame includes a vehicle body front bracket, a vehicle body rear Bracket and U-shaped longitudinal beam, the front bracket of the vehicle body and the tail bracket of the vehicle body are respectively fixed on the front and rear sides of the U-shaped longitudinal beam, and the U-shaped longitudinal beam cooperates with the front bracket of the vehicle body to form a driving cabin, the U-shaped longitudinal beam cooperates with the rear bracket of the vehicle body to form a power cabin, the power assembly is installed in the power cabin, and is used to drive the movement of the rear wheel system, and the steering system is installed in the In the cockpit, it is used to drive the front wheel system to turn, the brake system is installed on the front wheel system for braking the front wheel system, and the rear suspension structure is connected to the rear wheel system and the vehicle frame, the front suspension structure connects the front wheel system and the front bracket of the vehicle body, the front suspension structure is a double wishbone suspension, and the rear suspension structure is a multi-link Rod suspension.

Preferably, the front wheel system includes a front wheel hub and a front wheel tire, the front wheel hub includes a front wheel bogie, a front wheel hub shaft, a front wheel disc and a front wheel rim, and the front wheel hub shaft is connected to the front wheel The front wheel bogie is integrally formed, the front wheel disc is mounted on the front wheel hub shaft through a bearing, the front wheel rim is fixed to the front wheel disc, and the front wheel tire is installed on the front wheel on the rim of the wheel; the steering system includes a steering wheel, a steering shaft, a steering gear and a steering half shaft. The steering wheel is connected, the steering gear is connected to the end of the steering shaft, the steering gear includes two output ends, the number of the steering half shafts is also two, the input end of the steering half shaft is connected to the The output ends of the steering gear are connected one by one, and the output ends of the steering half shaft are connected with the front wheel system to drive the front wheel system to turn.

Preferably, the front bracket of the vehicle body includes a front bottom frame, a front frame, a side rail and a roof rail, the front frame is arranged at the front end of the front bottom frame, and the front end of the side rail is connected to the side rail. The front frame is welded and fixed, the rear end is connected to the U-shaped longitudinal beam, the bottom is welded and fixed to the front underframe, one end of the roof guardrail is welded and fixed to the side guardrail, and the other end is connected to the U-shaped longitudinal beam. The top of the beam is welded and fixed, and the roof anti-collision rail is L-shaped, and cooperates with the side guardrail and the U-shaped longitudinal beam frame to form an entrance for the driver to enter and exit the cockpit; The bracket includes a tail bottom frame, a tail bar and a tail support rod, the head end of the tail bottom frame is fixed to the front bottom frame, and the end is suspended; the top of the tail bar is connected to the U-shaped longitudinal beam The top is welded and fixed, and the bottom of the tail bar is welded and fixed to the end of the tail bottom frame; the tail brace is connected to the tail bar and the side of the U-shaped longitudinal beam.

Preferably, the front suspension structure includes an upper wishbone, a lower wishbone and a front shock absorber, the upper wishbone and the lower wishbone are respectively arranged at the upper and lower ends of the front wheel bogie, the One end of the front shock absorber is hinged with the lower wishbone, and the other end is hinged with the vehicle side guardrail.

Preferably, the braking system includes a brake disc, a brake pad mounting bracket and a brake pad, the brake disc is fixed to the front wheel disc, the brake pad mounting bracket is fixed to the front wheel bogie, the The brake pads are correspondingly installed on the brake pad mounting bracket, the number of the brake pads is two, and the two brake pads are located on opposite sides of the brake disc.

Preferably, the rear suspension structure includes a first connecting rod, a reinforcing rod, a connecting piece, a shock absorber, a second connecting rod and a third connecting rod, one end of the first connecting rod is hinged to the U-shaped longitudinal beam , the other end is welded and fixed to the top of the connecting block; one end of the reinforcing rod is welded and fixed to the first connecting rod, and the other end is welded and fixed to the bottom of the connecting block, and the connecting block is fixed to the rear wheel system fixed, one end of the second connecting rod is hinged to the rear wheel system, and the other end is hinged to the rear bracket of the vehicle body; one end of the third connecting rod is hinged to the rear wheel system, and the other end is hinged to the rear bracket of the vehicle body Hinged, and the third connecting rod is arranged in parallel and spaced below the second connecting rod; the first connecting rod, the reinforcing rod, the second connecting rod and the third connecting rod are all hollow rods; the first connecting rod The axis direction of the connecting rod forms an included angle with the axis of the second connecting rod, and the included angle is an acute angle.

Preferably, the power assembly includes a drive assembly, a speed reducer and a transmission half shaft, the drive assembly and the speed reducer are both fixed to the tail bracket of the vehicle body, the rear wheel system includes a rear wheel hub and a front tire, the The front tire is sleeved on the rear wheel hub, the drive assembly is connected to the input shaft of the reducer, the input end of the drive half shaft is connected to the output shaft of the reducer, and the drive half shaft The output end of the reducer is connected to the hub of the rear wheel; the output shaft of the reducer includes two output ends, and the two output ends are respectively located at opposite ends of the reducer, and each of the transmission half shafts is connected to the reducer Connected to one output end of the device, the connection method is the spline connection of the rear wheel.

Preferably, the rear wheel hub includes a front wheel rim, a rear wheel disc, a rear wheel hub shaft, a rear wheel spline and a rear wheel hub bearing, the rear wheel disc is fixed to the inner ring of the front wheel rim, and the The hub shaft of the rear wheel is integrally formed with the disc of the rear wheel, and the central axes of the two are on the same straight line. The spline of the rear wheel includes an integrally formed external thread shaft end and an inner rear wheel spline end. The hub shaft is a hollow shaft body, the externally threaded shaft end is inserted into the hollow area of the rear wheel hub shaft and threadedly connected with it, the transmission half shaft is keyed to the splined end of the inner rear wheel, and the The rear wheel hub bearing is sleeved on the periphery of the rear wheel hub axle.

Preferably, the outer wall of the hub shaft of the rear wheel is provided with a first connecting part, a second connecting part, a first hinge part and a second hinge part, and the first connecting part and the second connecting part are located at the rear The same side of the wheel hub bearing, the first hinge part and the second hinge part are located on the same side of the rear wheel hub bearing, the first connecting part and the first hinge part are located at the rear wheel hub Different sides of the bearing; the top of the connecting block is connected with the first connecting part, and the bottom is connected with the second connecting part; one end of the second connecting rod is hinged with the tail bar, and the other end is connected with the The first hinge part is hinged; one end of the third connecting rod is hinged with the tail gear lever, and the other end is hinged with the second hinged part.

Preferably, the first connecting part and the second connecting part are located on one side of the rear wheel hub bearing and symmetrically arranged at the upper and lower ends of the rear wheel hub bearing, and the first hinge part and the The second hinge part is located on the other side of the rear wheel hub bearing and symmetrically arranged at the upper and lower ends of the rear wheel hub bearing.

Compared with the related art, in the all-terrain vehicle provided by the present invention, the vehicle frame includes the front bracket of the vehicle body, the rear bracket of the vehicle body and the U-shaped longitudinal beam, and the U-shaped longitudinal beam is used as the core force-bearing part of the vehicle frame, which can improve the vehicle frame. strength, and a front suspension structure and a rear suspension structure are provided at the same time. The front suspension structure is a double-wishbone suspension, and the rear suspension structure is a multi-link suspension, which can well ease The impact force received keeps the body in a good driving posture and improves driving comfort and handling.

【Description of drawings】

In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings that need to be used in the description of the embodiments will be briefly introduced below. Obviously, the drawings in the following description are only some embodiments of the present invention. For those of ordinary skill in the art, other drawings can also be obtained based on these drawings without creative work, wherein:

Fig. 1 is the structural representation of a kind of all-terrain vehicle provided by the present invention;

Fig. 2 is the partial exploded structure diagram of the rear wheel system and the rear suspension mechanism of the all-terrain vehicle;

Fig. 3 is a structural schematic diagram of the rear suspension structure shown in Fig. 2;

Fig. 4 is the structural representation of rear wheel hub bearing;

Fig. 5 is a schematic diagram of a partial exploded structure of the front wheel system and suspension structure of an all-terrain vehicle;

Fig. 6 is the connection diagram of steering system, front wheel system and front suspension structure;

Fig. 7 is a structural schematic diagram of the braking system.

【Detailed ways】

In order to enable those skilled in the art to better understand the technical solutions in the embodiments of the present invention, and to make the above-mentioned purposes, features and advantages of the present invention more obvious and understandable, the specific implementation of the present invention will be described below in conjunction with the accompanying drawings of the present application for further clarification.

Please refer to FIGS. 1-7 in combination. The present invention provides an all-terrain vehicle 100, including a vehicle frame 10, a power assembly 20, a rear wheel system 30, a rear suspension structure 40, a front wheel system 50, a steering system 60, and a front suspension. Structure 70 and braking system 80.

The vehicle frame 10 is assembled with hollow steel pipes as a whole, which can reduce the dead weight of the all-terrain vehicle, and the steel pipes are welded and fixed to ensure the strength of the connection.

The vehicle frame 10 includes a vehicle body front bracket 11, a vehicle body rear bracket 12 and a U-shaped longitudinal beam 13, and the vehicle body front bracket 11 and the vehicle body rear bracket 12 are respectively fixed on the front and rear sides of the U-shaped longitudinal beam 13. side. The U-shaped longitudinal beam 13 cooperates with the vehicle body front bracket 11 to form a cockpit, and the U-shaped longitudinal beam 13 cooperates with the vehicle body tail bracket 12 to form a power cabin. The power assembly 20 is installed in the power compartment for driving the rear wheel system 30 to move, the steering system 60 is installed in the cockpit for driving the front wheel system 50 to turn, the The braking system 80 is installed on the front wheel system 50 for braking the front wheel system 50, the rear suspension structure 40 connects the rear wheel system 30 and the vehicle frame 10, the front The suspension structure 70 connects the front wheel system 50 and the front bracket 11 of the vehicle body, the front suspension structure 70 is a double-wishbone suspension, and the rear suspension structure 40 is a multi-link suspension.

The front bracket 11 of the vehicle body includes a front bottom frame 111 , a front frame 112 , side rails 113 and a roof rail 114 . The front frame 112 is arranged on the front end of the front bottom frame 111. The front frame 112 is a rectangular frame structure as a whole, which is formed by welding four steel pipes end to end. The stability of the rectangular structure is relatively poor. When impacted, it can be well deformed or damaged to form an energy-absorbing effect. The front end of the car side guardrail 113 is welded and fixed to the front frame 112 , the rear end is connected to the U-shaped longitudinal beam 13 , and the bottom is welded and fixed to the front bottom frame 111 . One end of the roof guardrail 114 is welded and fixed to the side guardrail 113, and one end is welded and fixed to the top of the U-shaped longitudinal beam 13. 113 and the U-shaped longitudinal beam 13 cooperate to encircle the entrance and exit for the driver to enter and exit the cockpit.

The tail bracket 12 of the vehicle body includes a tail bottom frame 121, a tail bar 122 and a tail rod 123, the head end of the tail bottom frame 121 is fixed to the front bottom frame 111, and the end is suspended; The top of 122 is welded to the top of the U-shaped longitudinal beam 13, and the bottom of the tail bar 122 is welded to the end of the tail bottom frame 121; the tail bar 123 is connected to the tail bar 122 and The side portion of the U-shaped longitudinal beam 13 is used to strengthen the strength of the tail bar 122 .

The power assembly 20 is accommodated in the power compartment and installed on the rear bottom frame 121 , and the vehicle body bar 122 can form protection for the power assembly 20 . The all-terrain vehicle is a rear-drive driving mode, and the power assembly 20 is used to directly drive the movement of the rear wheel system 30, the rear wheel system 30 is used as a driving wheel, and the front wheel system of the all-terrain vehicle is used as a slave moving wheel.

The power assembly 20 includes a drive assembly 21, a speed reducer 22 and a drive shaft 23. The drive assembly 21 can be an engine or an electric motor. The power generated by the drive assembly 21 is first input into the speed reducer 22, and then passed through the The reducer 22 is transmitted to the transmission half shaft 23, and the transmission half shaft 23 is connected with the rear wheel system 30 to drive the rear wheel system 30 to move. The speed reducer 22 adopts a conventional structure in the field. A small gear is installed on the input shaft, and a large gear is installed on the output shaft. The small gear and the large gear are directly meshed, or through a plurality of gear meshing transmissions, and the torque is increased by deceleration. Purpose, can be better suitable for all-terrain driving.

Specifically, the output shaft of the speed reducer 22 includes two output ends, and the two output ends are respectively located at opposite ends of the speed reducer 22. The number of the transmission half shafts 23 is two, and each The transmission half shaft 23 is connected to an output end, and the connection mode between the transmission half shaft 23 and the output end is: the output end is an inner rear wheel spline, and the input end of the transmission half shaft 23 is connected to the inner rear wheel spline of the output end. Rear wheel spline key connection. By arranging two output ends on one output shaft, it can be ensured that the motion states of the two transmission half shafts 23 are consistent.

The rear wheel system 30 includes a rear wheel hub 31 and a rear wheel tire 32 , the rear wheel hub 31 is connected to the transmission half shaft 23 , and the rear wheel tire 32 is mounted on the rear wheel hub 31 .

The rear wheel hub 31 includes a rear wheel rim 311, a rear wheel disc 312, a rear wheel hub shaft 313, a rear wheel spline 314 and a rear wheel hub bearing 315, and the rear wheel disc 312 and the rear wheel rim 311 The inner ring of the rear wheel is fixed, the rear wheel hub shaft 313 is integrally formed with the rear wheel disc 312 and the central axes of the two are on the same straight line, and the rear wheel spline 314 includes an integrally formed external thread shaft end and an internal The rear wheel spline end, the rear wheel hub shaft 313 is a hollow shaft body, the externally threaded shaft end is inserted into the hollow area of the rear wheel hub shaft 313 and is threadedly connected with it, and the transmission half shaft 23 and The spline end of the inner rear wheel is keyed. The rear wheel hub bearing 315 is sleeved on the periphery of the rear wheel hub shaft 313 , and the rear wheel hub shaft 313 can freely rotate in the rear wheel hub bearing 315 .

Specifically, the outer wall of the rear wheel hub bearing 315 is provided with a first connecting portion 3151 , a second connecting portion 3152 , a first hinged portion 3153 and a second hinged portion 3154 . The first connecting part 3151 and the second connecting part 3152 are located on the same side of the rear wheel hub bearing 315 , and the first hinge part 3153 and the second hinge part 3153 are located on the rear wheel hub bearing 315 On the same side of the rear wheel hub bearing 315 , the first connecting portion 3151 and the first hinge portion 3153 are located on different sides of the rear wheel hub bearing 315 .

The rear suspension structure 40 includes a first connecting rod 41 , a reinforcing rod 42 , a connecting block 43 , a rear shock absorber 44 , a second connecting rod 45 and a third connecting rod 46 . The first connecting rod 41 , reinforcing rod 42 , second connecting rod 45 and third connecting rod 46 are all hollow rod bodies.

One end of the first connecting rod 41 is hinged to the U-shaped longitudinal beam 13, and the other end is welded and fixed to the top of the connecting block 43; one end of the reinforcing rod 42 is welded and fixed to the first connecting rod 41, and the other end It is welded and fixed with the bottom of the connecting block 43 , and the connecting block 43 is fixed with the hub bearing 315 of the rear wheel.

The reinforcing rod 42 is designed as a diagonal brace, and cooperates with the first connecting rod 41 and the connecting block 43 to form a stable structure of a siege triangle, which can greatly strengthen the strength of the first connecting rod 41 . The reinforcing rod 42 , the first connecting rod 41 and the connecting block 43 are fixed by welding to form a rigid structure, so that the movement states of the three are consistent. One end of the rear shock absorber 44 is hinged to the first connecting rod 41, and the other end is hinged to the U-shaped longitudinal beam 13. The rear shock absorber 44 is used to provide a shock absorbing effect. A conventional structure is sufficient. The U-shaped longitudinal beam 13 is used as the core force-bearing part of the vehicle frame 10, and the rear shock absorber 44 is connected with the U-shaped longitudinal beam 13, which can directly provide good vibration for the U-shaped longitudinal beam 13. The effect of buffering and releasing force, the seats in the cockpit directly lean against the U-shaped longitudinal beam 13, which can improve driving comfort. Specifically, the top of the connection block 43 is connected to the first connection part 3151 , and the bottom is connected to the second connection part 3152 .

One end of the second connecting rod 45 is hinged to the rear wheel system 30, and the other end is hinged to the rear bracket 12 of the vehicle body. One end of the third connecting rod 46 is hinged to the rear wheel system 30, and the other end is hinged to the rear wheel system 30. The tail bracket 12 of the vehicle body is hinged, and the third connecting rod 46 is disposed below the second connecting rod 45 in parallel and at intervals. Specifically, one end of the second link 45 is hinged to the tail bar 122, and the other end is hinged to the first hinge part 3153; one end of the third link 46 is hinged to the tail bar 122, and the other end is hinged to the first hinge 3153; One end is hinged to the second hinge part 3154 .

The second connecting rod 45 and the third connecting rod 46 are mounted on the upper and lower ends of the rear wheel hub bearing 315 for balancing the force on the upper and lower ends of the rear wheel hub bearing 315 .

It should be noted that the articulation method of the connecting rod and the hub bearing of the rear wheel, and the setting method of the hinge point of the connecting rod and the vehicle frame can adopt the conventional structure in the field, for example, a fisheye ball head is arranged at the end of the connecting rod, and the fisheye ball The head cover is arranged on the pin shaft, and the fisheye ball head can rotate around the pin shaft to adapt to the shaking of the all-terrain vehicle in the vertical direction.

The first connecting rod 41 is connected to the U-shaped longitudinal beam 13, the second connecting rod 45 and the third connecting rod 46 are connected to the rear bracket 12 of the vehicle body, and the setting positions of the three are different, and can be easily A good cushioning effect is provided for different positions of the vehicle frame 10 to achieve the purpose of improving driving comfort.

The front wheel system 50 includes a front wheel hub 51 and a front wheel tire 52 , and the front wheel tire 52 is installed on the front wheel hub 51 . The front wheel hub 51 includes a front wheel bogie 511, a front wheel hub axle 512, a front wheel disc 513 and a front wheel rim 514, the front wheel hub axle 512 is integrally formed with the front wheel bogie 511, the The front wheel disc 513 is installed on the front wheel hub shaft 512 through a bearing, the front wheel rim 514 is fixed with the front wheel disc 513 , and the front wheel tire 52 is installed on the front wheel rim 514 . The front wheel system 50 is used as a driven wheel. When the rear wheel system 30 moves, the front wheel disc 513 rotates on the front wheel hub shaft 512 to drive the front wheel rim 514 and the front wheel The tire 52 rotates.

The steering system 60 includes a steering wheel 61 , a steering shaft 62 , a steering gear 63 and a steering half shaft 64 . The steering wheel 61 is arranged in the cockpit and is mounted on the vehicle frame 10 through a bracket. Specifically, the steering wheel 61 is fixed to the roof rail 114 through a bracket; the head end of the steering shaft 62 It is connected to the steering wheel 61 and driven to rotate by the steering wheel 61; the steering gear 63 is connected to the end of the steering shaft 62 for changing the direction of force transmission, and the steering gear 63 adopts a conventional structure in the art. The steering gear 63 includes two output ends, and the number of the steering half shafts 64 is also two, and the input ends of the steering half shafts 64 are connected to the output ends of the steering gear 63 one by one. The output end of the half shaft 64 is connected with the front wheel system 50 to drive the front wheel system 50 to turn. Specifically, the output end of the steering half shaft 64 is hinged to the front wheel bogie 511 in the following way: a fisheye ball head is installed on the output end of the steering half shaft 64, and the front wheel bogie 511 A hinge piece is arranged on the side, and the fisheye ball head is sandwiched between the two hinge pieces, and the pin shaft passes through the central hole of the fisheye ball head to connect with the hinge piece.

The front suspension structure 70 includes an upper wishbone 71, a lower wishbone 72 and a front shock absorber 73. The upper wishbone 71 and the lower wishbone 72 are respectively arranged on the upper and lower sides of the front wheel bogie 511. Specifically, one end of the upper wishbone 71 is hinged with the top of the front wheel bogie 511, and the other end is hinged with the side guardrail 113; one end of the lower wishbone 72 is hinged with the front wheel truck 511 The bottom of the frame is hinged, and the other end is hinged with the front bottom frame. The upper fork 71 and the lower fork 72 adopt a conventional Y-shaped fork structure in the field. One end of the front shock absorber 73 is hinged to the lower wishbone 72 , and the other end is hinged to the vehicle side guardrail 113 .

The braking system 80 includes a brake disc 81, a brake pad mounting bracket 82 and a brake pad 83, the brake disc 81 is fixed to the front wheel disc 513, the brake pad mounting bracket 82 is connected to the front wheel bogie 511 is fixed, and the brake pads 83 are correspondingly installed on the brake pad mounting bracket 82. The number of the brake pads 83 is two, and the two brake pads 83 are located on opposite sides of the brake disc 81. When braking, the two brake pads 83 approach and hug the brake disc 81 to form a braking effect. The driving method of the brake pads 83 belongs to common knowledge in the field, which will not be described in detail in this embodiment.

Compared with the related art, in the all-terrain vehicle provided by the present invention, the vehicle frame includes the front bracket of the vehicle body, the rear bracket of the vehicle body and the U-shaped longitudinal beam, and the U-shaped longitudinal beam is used as the core force-bearing part of the vehicle frame, which can improve the vehicle frame. strength, and a front suspension structure and a rear suspension structure are provided at the same time. The front suspension structure is a double-wishbone suspension, and the rear suspension structure is a multi-link suspension, which can well ease The impact force received keeps the body in a good driving posture and improves driving comfort and handling.

The embodiments of the present invention have been described in detail above, but the present invention is not limited to the described embodiments. For those skilled in the art, various changes, modifications, substitutions and modifications to these embodiments without departing from the principle and spirit of the present invention still fall within the protection scope of the present invention.

Claims (7)

1. A kind of all-terrain vehicle, it is characterized in that, comprises vehicle frame, power assembly, rear wheel system, rear suspension structure, front wheel system, steering system, front suspension structure and brake system, and described vehicle frame comprises vehicle body The front bracket, the rear bracket of the vehicle body and the U-shaped longitudinal beam. The upper bracket cooperates to form a cockpit, and the U-shaped longitudinal beam cooperates with the rear bracket of the vehicle body to form a power cabin. The power assembly is installed in the power cabin and is used to drive the rear wheel system to move. The steering system is installed in the cockpit for driving the steering of the front wheel system, the braking system is installed on the front wheel system for braking the front wheel system, and the rear suspension The structure connects the rear wheel system and the vehicle frame, the front suspension structure connects the front wheel system and the front bracket of the vehicle body, the front suspension structure is a double-wishbone suspension, and the rear The suspension structure is a multi-link suspension; The front bracket of the vehicle body includes a front bottom frame, a front frame, side guardrails, and a roof guardrail. The front frame is arranged on the front end of the front bottom frame. Four steel pipes are welded end to end, the front end of the car side guardrail is welded and fixed to the front frame, the rear end is connected to the U-shaped longitudinal beam, and the bottom is welded and fixed to the front bottom frame. One end of the roof guardrail is welded and fixed to the side guardrail of the vehicle, and the other end is welded and fixed to the top of the U-shaped longitudinal beam. The roof guardrail is bent in an L shape and is matched with the vehicle side guardrail and the U-shaped longitudinal beam frame Enclose the entrance and exit for the driver to enter and exit the cockpit; the rear bracket of the vehicle body includes a rear bottom frame, a rear stop bar and a rear support rod, the head end of the rear bottom frame is fixed to the front bottom frame, and the end hangs The top of the tail bar is welded to the top of the U-shaped longitudinal beam, and the bottom of the tail bar is welded to the end of the tail bottom frame; the tail bar is connected to the tail bar and the sides of the U-shaped stringers; The front suspension structure includes an upper wishbone, a lower wishbone and a front shock absorber, the upper wishbone and the lower wishbone are respectively arranged at the upper and lower ends of the front wheel bogie, and one end of the front shock absorber It is hinged with the lower wishbone, and the other end is hinged with the vehicle side guardrail; The rear suspension structure includes a first connecting rod, a reinforcing rod, a connecting block, a shock absorber, a second connecting rod and a third connecting rod, one end of the first connecting rod is hinged to the U-shaped longitudinal beam, and the other end is It is welded and fixed to the top of the connecting block; one end of the reinforcing rod is welded and fixed to the first connecting rod, and the other end is welded and fixed to the bottom of the connecting block, the connecting block is fixed to the rear wheel system, and the second One end of the second connecting rod is hinged with the rear wheel system, and the other end is hinged with the tail bracket of the vehicle body; one end of the third connecting rod is hinged with the rear wheel system, and the other end is hinged with the tail bracket of the vehicle body, and the The third connecting rod is arranged below the second connecting rod in parallel at intervals; the first connecting rod, the reinforcing rod, the second connecting rod and the third connecting rod are all hollow rod bodies; the axial direction of the first connecting rod An included angle is formed with the axis of the second connecting rod, and the included angle is an acute angle. 2. The all-terrain vehicle according to claim 1, wherein the front wheel system comprises a front wheel hub and a front wheel tire, and the front wheel hub comprises a front wheel bogie, a front wheel hub axle, a front wheel wheel disc and front wheel rim, the front wheel hub axle is integrally formed with the front wheel bogie, the front wheel disc is mounted on the front wheel hub axle through a bearing, the front wheel rim and the front wheel The wheel disc is fixed, and the front wheel tire is installed on the rim of the front wheel; the steering system includes a steering wheel, a steering shaft, a steering gear and a steering half shaft, and the steering wheel is arranged in the cockpit and installed on the On the vehicle frame, the head end of the steering shaft is connected to the steering wheel, the steering gear is connected to the end of the steering shaft, the steering gear includes two output ends, and the number of the steering half shafts is also The input end of the steering half shaft is connected to the output end of the steering gear in a one-to-one correspondence, and the output end of the steering half shaft is connected to the front wheel system to drive the front wheel system to turn. 3. The all-terrain vehicle according to claim 2, wherein the braking system includes a brake disc, a brake pad mounting bracket and a brake pad, the brake disc is fixed to the front wheel disc, and the brake disc The pad mounting bracket is fixed to the front wheel bogie, and the brake pads are correspondingly installed on the brake pad mounting bracket. The number of the brake pads is two, and the two brake pads are located opposite to the brake disc. sides. 4. The all-terrain vehicle according to claim 3, wherein the power assembly includes a drive assembly, a speed reducer and a transmission half shaft, and the drive assembly and the speed reducer are all fixed to the tail bracket of the vehicle body, The rear wheel system includes a rear wheel hub and a rear tire, the rear tire is sheathed on the rear wheel hub, the drive assembly is connected to the input shaft of the reducer, and the input end of the transmission half shaft is connected to the The output shaft of the reducer is connected, and the output end of the transmission half shaft is connected with the hub of the rear wheel; the output shaft of the reducer includes two output ends, and the two output ends are respectively located at opposite sides of the reducer. At both ends, each of the transmission half shafts is connected to an output end of the reducer, and the connection method is a rear wheel spline connection. 5. The all-terrain vehicle according to claim 4, wherein the rear wheel hub comprises a rear wheel rim, a rear wheel disc, a rear wheel hub shaft, a rear wheel spline and a rear wheel hub bearing, and the rear wheel The wheel disc is fixed to the inner ring of the rear wheel rim, the hub shaft of the rear wheel is integrally formed with the wheel disc of the rear wheel and the central axes of the two are on the same straight line, and the spline of the rear wheel includes an integrally formed external thread shaft end and inner rear wheel spline end, the rear wheel hub shaft is a hollow shaft body, the externally threaded shaft end is inserted into the hollow area of the rear wheel hub shaft and threadedly connected with it, and the transmission half shaft It is connected with the splined end of the inner rear wheel, and the hub bearing of the rear wheel is sleeved on the periphery of the hub axle of the rear wheel. 6. The all-terrain vehicle according to claim 5, wherein the outer wall of the rear wheel hub bearing is provided with a first connecting portion, a second connecting portion, a first hinged portion and a second hinged portion, the first hinged portion A connection part and the second connection part are located on the same side of the rear wheel hub bearing, the first hinge part and the second hinge part are located on the same side of the rear wheel hub bearing, and the first connection part and the first hinge part are located on different sides of the rear wheel hub bearing; the top of the connection block is connected with the first connection part, and the bottom part is connected with the second connection part; the second connecting rod One end is hinged to the tail bar, and the other end is hinged to the first hinge; one end of the third link is hinged to the tail bar, and the other end is hinged to the second hinge. 7. The all-terrain vehicle according to claim 6, wherein the first connecting portion and the second connecting portion are located on one side of the rear wheel hub bearing and symmetrically arranged on the rear wheel hub bearing The upper and lower ends of the rear wheel hub bearing, the first hinged part and the second hinged part are located on the other side of the rear wheel hub bearing and symmetrically arranged at the upper and lower ends of the rear wheel hub bearing.

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