All-terrain vehicle

Abstract

The application provides an all-terrain vehicle, which comprises a frame, a power system, a transmission system, a walking assembly, a cooling system and a door assembly, the cooling system is at least partially connected to the power system, the door assembly is arranged on both sides of the all-terrain vehicle, the cooling system comprises a cooling module which is at least partially connected to the power system and a flow guide mechanism which guides air for the cooling module, the flow guide mechanism comprises a flow guide shell and air inlet pieces arranged on both sides of the flow guide shell, a transverse plane perpendicular to the length direction of the all-terrain vehicle is defined, the projection of the air inlet pieces on the transverse plane along the length direction of the all-terrain vehicle is an air inlet piece projection, the projection of the door assembly on the transverse plane along the length direction of the all-terrain vehicle is a door projection, and the door projection is located between the two air inlet piece projections. According to the application, the two air inlet pieces are arranged on both sides of the door assembly, the door assembly can guide air for the air inlet pieces, the air volume entering the air inlet pieces is increased, and the cooling efficiency of the cooling system is improved.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of vehicle technology, in particular to an all-terrain vehicle. BACKGROUND

[0002] As a kind of vehicle with strong passing performance and fun, all-terrain vehicle is more and more favored by consumers. Among them, SSV (Side by Side Vehicle) and UTV (Utility Vehicle) are two types of all-terrain vehicles, mainly referring to vehicles with semi-enclosed cab.

[0003] The cooling system is an important part of the all-terrain vehicle, which can cool the power system and ensure the stability of the power system. In the existing all-terrain vehicle, the air intake of the cooling system is small, which leads to low cooling efficiency of the cooling system. SUMMARY

[0004] In order to solve the problems of the prior art, the purpose of the present application is to provide an all-terrain vehicle with a high air intake cooling system.

[0005] To achieve the above purpose, the technical scheme adopted by the present application is as follows:

[0006] The present application provides an all-terrain vehicle, which comprises a vehicle frame, a power system, a transmission system, a walking assembly, a cooling system and a door assembly. The vehicle frame comprises a rear frame arranged at the rear of the all-terrain vehicle, the power system is arranged in the vehicle frame, the transmission system is at least partially connected to the power system, the walking assembly is at least partially connected to the transmission system, the cooling system is at least partially connected to the power system, the door assembly is arranged on both sides of the all-terrain vehicle, the cooling system is arranged in the rear frame, and the cooling system comprises a cooling module at least partially connected to the power system and a flow guide mechanism for guiding air flow for the cooling module. The flow guide mechanism comprises a flow guide housing and an air inlet arranged on both sides of the flow guide housing. A transverse plane perpendicular to the length direction of the all-terrain vehicle is defined, the projection of the air inlet on the transverse plane in the length direction of the all-terrain vehicle is the air inlet projection, the projection of the door assembly on the transverse plane in the length direction of the all-terrain vehicle is the door projection, and the door projection is located between the two air inlet projections.

[0007] Further, in the length direction of the all-terrain vehicle, the door assembly is located in front of the air inlet.

[0008] Further, the air inlet comprises an air inlet, and the extension straight line of the air inlet is defined as the air inlet extension straight line. A longitudinal plane perpendicular to the width direction of the all-terrain vehicle is defined, and a reference plane perpendicular to the height direction of the all-terrain vehicle is defined. The angle between the air inlet extension straight line and the longitudinal plane is greater than or equal to 30° and less than or equal to 70°, and the angle between the air inlet extension straight line and the reference plane is greater than or equal to 0° and less than or equal to 30°.

[0009] Further, the air inlet comprises an upper air inlet, the upper air inlet is arranged at an upper portion of the air inlet, the power system further comprises a transmission and a transmission air inlet pipe, one end of the transmission air inlet pipe is connected to the upper air inlet, the other end of the transmission air inlet pipe is connected to the transmission, the power system further comprises an air filter and an air filter air inlet pipe, one end of the air filter air inlet pipe is connected to the upper air inlet, the other end of the air filter air inlet pipe is connected to the air filter.

[0010] Further, the air inlet comprises an upper air inlet, the upper air inlet is arranged at an upper portion of the air inlet, the cooling system further comprises a cooling water kettle, one portion of the cooling water kettle is connected to the power system, the other portion of the cooling water kettle is connected to the cooling module; in the length direction of the all-terrain vehicle, the cooling water kettle is arranged behind the upper air inlet.

[0011] Further, the power system further comprises a transmission, the transmission comprises a transmission air outlet, and the transmission air outlet is arranged towards the rear in the length direction of the all-terrain vehicle.

[0012] Further, the flow guide mechanism further comprises an auxiliary air inlet part, the auxiliary air inlet part is arranged at the front end of the flow guide shell, the all-terrain vehicle further comprises a seat assembly, the auxiliary air inlet part partially overlaps the seat assembly in the length direction of the all-terrain vehicle; the flow guide shell, the air inlet part and the auxiliary air inlet part are integrally formed.

[0013] Further, in the height direction of the all-terrain vehicle, the top end of the seat assembly is arranged lower than the bottom end of the auxiliary air inlet part, or the top end of the seat assembly is arranged higher than the bottom end of the auxiliary air inlet part and the top end of the seat assembly is arranged lower than the top end of the auxiliary air inlet part.

[0014] Further, a transverse plane perpendicular to the length direction of the all-terrain vehicle is defined, a projection of the flow guide mechanism on the transverse plane in the length direction of the all-terrain vehicle is a flow guide mechanism projection, a projection of the auxiliary air inlet part on the transverse plane in the length direction of the all-terrain vehicle is an auxiliary air inlet part projection, and a ratio of a size of the auxiliary air inlet part projection in the width direction of the all-terrain vehicle to a size of the flow guide mechanism projection in the width direction of the all-terrain vehicle is greater than or equal to 0.2 and less than or equal to 0.4.

[0015] Further, the cooling system comprises a cooling module, the cooling module is connected to the rear frame, the cooling module comprises an intercooler, a radiator and a fan device, the fan device is arranged at one side of the radiator, and the intercooler is arranged at the other side of the radiator.

[0016] The present application can guide the air into the air inlet by the door assembly, increase the air volume entering the air inlet, and improve the cooling efficiency of the cooling system by arranging two air inlets on both sides of the door assembly. BRIEF DESCRIPTION OF DRAWINGS

[0017] Figure 1 Fig. 1 is a structural schematic diagram of an all-terrain vehicle of the present application.

[0018] Figure 2 Fig. 2 is a schematic diagram of a power system and a transmission system of the all-terrain vehicle of the present application.

[0019] Figure 3 Fig. 3 is a structural schematic diagram of a cooling module and a frame of the all-terrain vehicle of the present application.

[0020] Figure 4 Fig. 4 is a side view schematic diagram of the cooling module of the all-terrain vehicle of the present application.

[0021] Figure 5 Fig. 5 is a top view schematic diagram of the cooling module of the all-terrain vehicle of the present application.

[0022] Figure 6 Fig. 6 is a position schematic diagram of the cooling module of the all-terrain vehicle of the present application.

[0023] Figure 7 Fig. 7 is a top view schematic diagram of a flow guide mechanism of the all-terrain vehicle of the present application.

[0024] Figure 8 Fig. 8 is a side view schematic diagram of the flow guide mechanism of the all-terrain vehicle of the present application.

[0025] Figure 9 Fig. 9 is a front view schematic diagram of the flow guide mechanism of the all-terrain vehicle of the present application.

[0026] Figure 10 Fig. 10 is a structural schematic diagram of a fixing frame of the cooling module of the all-terrain vehicle of the present application.

[0027] Figure 11 Fig. 11 is a schematic diagram of a fan control circuit of the all-terrain vehicle of the present application.

[0028] Figure 12 Fig. 12 is a structural schematic diagram of a radiator of the cooling module of the all-terrain vehicle of the present application.

[0029] Figure 13 Fig. 13 is a structural schematic diagram of an oil cooler and a radiator of the all-terrain vehicle of the present application.

[0030] Figure 14 Fig. 14 is a structural schematic diagram of a cooling kettle of the all-terrain vehicle of the present application. DETAILED DESCRIPTION

[0031] In order to make the personnel in the art better understand the present application scheme, the technical scheme in the specific embodiment of the present application will be described clearly and completely in combination with the drawings in the embodiment of the present application.

[0032] It is to be understood that when an element is referred to as being "on" another element, it can be directly on the other element or intervening elements can also be present. When an element is referred to as being "connected" to another element, it can be directly connected to the other element or intervening elements can also be present. As used herein the terms "vertical", "horizontal", "left", "right", and the like are merely used for the purpose of illustration and do not indicate or imply absolute orientation.

[0033] In the description of the present application, it should be noted that the terms "first", "second" are used only for the purpose of description, and should not be understood as indicating or implying relative importance or implying the number of the technical features indicated. Therefore, the features defined with "first", "second" can explicitly or implicitly include at least one of the features.

[0034] In the description of the present application, it should be noted that the description "one component is located inside another component" means that one component is located on the side of another component away from the vehicle body cover 12 or away from the outer surface of the all-terrain vehicle 100.

[0035] The present application provides an all-terrain vehicle 100 as shown in Figure 1 The all-terrain vehicle 100 includes a frame 11, a vehicle body cover 12, a suspension assembly 13 and a walking assembly 14. In order to clearly define the technical solutions of the present application, the front side, the rear side, the left side, the right side, the upper side and the lower side as shown in Figure 1

[0036] In the description of the present application, it should be noted that the term "length direction" refers to the front-rear direction of the vehicle parallel to the driver of the all-terrain vehicle 100 in the driving state, the term "width direction" refers to the left-right direction of the vehicle parallel to the driver of the all-terrain vehicle 100 in the driving state, and the term "height direction" refers to the up-down direction of the vehicle parallel to the driver of the all-terrain vehicle 100 in the driving state.

[0037] As shown in Figure 1 and Figure 2 ​As shown, specifically, the all-terrain vehicle 100 further comprises a power system 15 and a transmission system 16. The frame 11 is used to constitute the main frame of the all-terrain vehicle 100, and the frame 11 surrounds a driver cabin 101 for a user to sit in, and other systems are directly or indirectly connected to the frame 11. The body cover 12 is arranged outside the frame 11 and is used to cover most of the frame 11. The suspension assembly 13 is connected to the frame 11, and the suspension assembly 13 is used to connect the walking assembly 14 to the frame 11. The power system 15 is at least partially connected to the frame 11 and is used to provide driving force for the all-terrain vehicle 100. The transmission system 16 is in driving connection with the power system 15, and the transmission system 16 receives the driving force output by the power system 15 and transmits the driving force to the walking assembly 14. The walking assembly 14 is at least partially arranged below the frame 11, and the walking assembly 14 directly or indirectly receives the driving force output by the transmission system 16 and drives the all-terrain vehicle 100 to walk. The walking assembly 14 includes front wheels 141 arranged at the front of the all-terrain vehicle 100 and rear wheels 142 arranged at the rear of the all-terrain vehicle 100. The all-terrain vehicle 100 in the embodiment of the application can be various types of all-terrain vehicles 100 including SSV and UTV.

[0038] As shown in Figure 3 and Figure 4 The all-terrain vehicle 100 comprises a cooling system 27, which can assist the engine 151 in heat exchange and enable the engine 151 to be at a suitable working temperature. The cooling system 27 comprises a cooling module 271 connected to the rear frame 114, and in the height direction of the all-terrain vehicle, the cooling module 271 is arranged above the engine 151 in the power system 15, and the cooling module 271 is mainly used for heat dissipation of the engine 151, and the cooling module 271 is arranged close to the engine 151 to improve the heat dissipation efficiency of the engine 151. The all-terrain vehicle 100 comprises a body cover 12 and a seat assembly 23, the body cover 12 comprises a cargo box connected to the rear frame 114, and in the length direction of the all-terrain vehicle 100, the cooling module 271 is arranged behind the seat assembly 23 and in front of the cargo box. The cooling module 271 is arranged between the seat assembly 23 and the cargo box, which can make full use of the space in the frame 11 and improve the space utilization of the all-terrain vehicle 100. The cooling module 271 is arranged close to the power system 15, which can reduce the distance between the cooling module 271 and the engine 151 and also increase the heat dissipation efficiency. As shown in Figure 4As shown, the cooling module 271 includes an integrated intercooler 2711, a radiator 2712 and a fan device 2713. The fan device 2713 is arranged on one side of the radiator 2712, and the intercooler 2711 is arranged on the other side of the radiator 2712. The intercooler 2711, the radiator 2712 and the fan device 2713 are integrated as a whole. The intercooler 2711 is used to reduce the intake temperature of the engine 151, improve the operation stability of the engine 151 and improve the working efficiency of the engine 151. The radiator 2712 is connected to the engine 151. When the engine 151 is working, the high-temperature coolant generated by the engine 151 is discharged into the radiator 2712. The high-temperature coolant flows and cools in the radiator 2712. The coolant cooled in the radiator 2712 reenters the engine 151 to cool the engine 151. The fan device 2713 drives the air flow at the positions of the intercooler 2711 and the radiator 2712, increases the rate of air flow, and removes the heat generated in the intercooler 2711 and the radiator 2712 through the air flow to achieve heat dissipation of the cooling module 271. In the embodiment of the present application, the intercooler 2711, the radiator 2712 and the fan device 2713 are integrated as the cooling module 271, which reduces the space occupied by the intercooler 2711, the radiator 2712 and the fan device 2713, improves the space utilization of the ATV 100, and optimizes the arrangement space of the ATV 100. The integrated intercooler 2711 and radiator 2712 share one fan device 2713 for heat dissipation, which improves the utilization rate of the fan device 2713 and reduces the energy consumption of the ATV 100.

[0039] As Figure 4 and Figure 5As shown, the extending plane of the cooling module 271 is defined as a cooling module plane 301, the axis of the fan 2713a is perpendicular to the cooling module plane 301, and the ratio of the size L1 of the cooling module 271 along the axis direction of the fan 2713a to the size L2 of the cooling module 271 along the width direction of the ATV is greater than or equal to 0.18 and less than or equal to 0.33. The size L1 of the cooling module 271 along the axis direction of the fan 2713a is the thickness of the cooling module 271, and the size L2 of the cooling module 271 along the width direction of the ATV is the length of the cooling module 271. When the ratio of the thickness to the length of the cooling module 271 is within the above range, the cooling module 271 has a larger fan device 2713, and the larger fan device 2713 can provide more cooling air volume and improve the cooling effect of the cooling module 271. At the same time, the thickness of the cooling module 271 is small, which increases the integration degree of the cooling module 271 and reduces the space occupation of the cooling module 271 in the length direction of the ATV. Further, the ratio of the size L1 of the cooling module 271 along the axis direction of the fan 2713a to the size L2 of the cooling module 271 along the width direction of the ATV is greater than or equal to 0.2 and less than or equal to 0.3. Further, the ratio of the size L1 of the cooling module 271 along the axis direction of the fan device 2713 to the size L2 of the cooling module 271 along the width direction of the ATV is greater than or equal to 0.23 and less than or equal to 0.28. A transverse plane 302 perpendicular to the length direction of the ATV is defined, and the included angle a1 between the cooling module plane 301 and the transverse plane 302 is greater than or equal to 5° and less than or equal to 30°. The cooling module 271 is arranged at a certain angle, which can facilitate the air flow of the cooling module 271 part driven by the fan device 2713, and the better the air flow, the stronger the heat dissipation effect. Further, the included angle a1 between the cooling module plane 301 and the transverse plane 302 is greater than or equal to 10° and less than or equal to 25°. Further, the included angle a1 between the cooling module plane 301 and the transverse plane 302 is greater than or equal to 15° and less than or equal to 20°. In addition, the fan 2713a is distributed along the cooling module plane 301.

[0040] As Figure 6As shown, a reference plane perpendicular to the height direction of the ATV is defined, the projection of the cooling module 271 on the reference plane along the height direction of the ATV is the cooling module projection, the projection of the axis of the front wheel 141 on the reference plane along the height direction of the ATV is the front wheel axis projection 303, the projection of the axis of the rear wheel 142 on the reference plane along the height direction of the ATV is the rear wheel axis projection 304, the distance from the front end of the cooling module projection to the front wheel axis projection 303 is defined as the cooling module front end distance L3, the distance from the front wheel axis projection 303 to the rear wheel axis projection 304 is defined as the drive shaft distance L4, the ratio between the cooling module front end distance L3 and the drive shaft distance L4 is greater than or equal to 0.6 and less than or equal to 0.9. The cooling module 271 is arranged closer to the rear wheel 142, which can avoid excessive occupation of the front space of the ATV 100 by the cooling module 271, and is also conducive to the weight distribution of the ATV 100, avoiding the increase of the front weight of the ATV 100 due to the arrangement of the cooling module 271. Further, the ratio between the cooling module front end distance L3 and the drive shaft distance L4 is greater than or equal to 0.65 and less than or equal to 0.85. Still further, the ratio between the cooling module front end distance L3 and the drive shaft distance L4 is greater than or equal to 0.7 and less than or equal to 0.8. The projection of the rear wheel 142 on the reference plane along the height direction of the ATV is the rear wheel projection, and in the width direction of the ATV, the ratio between the size L5 of the cooling module projection and the size L6 of the rear wheel projection is greater than or equal to 0.39 and less than or equal to 0.72. Controlling the size of the cooling module 271 in the width direction of the ATV can not only make the size of the cooling module 271 large enough to increase the cooling efficiency, but also avoid the size of the cooling module 271 being too large to occupy the arrangement space of other components. Further, the ratio between the size L5 of the cooling module projection and the size L6 of the rear wheel projection is greater than or equal to 0.44 and less than or equal to 0.66. Still further, the ratio between the size L5 of the cooling module projection and the size L6 of the rear wheel projection is greater than or equal to 0.49 and less than or equal to 0.61.

[0041] As an embodiment, the cooling system 27 comprises a flow guide mechanism 272 for guiding air to the cooling module 271, and the flow guide mechanism 272 extends substantially in the width direction of the ATV. Figure 7 and Figure 8As shown, the flow guide mechanism 272 includes a flow guide housing 2721 and an air inlet 2722 arranged at at least one end of the flow guide housing 2721. The flow guide housing 2721 encloses a gas chamber, and the air inlet 2722 is in communication with the gas chamber. The flow guide mechanism 272 is arranged at least partially on the vehicle frame 11, and the flow guide mechanism 272 is arranged behind the seat. The flow guide mechanism 272 guides and dissipates air to cool the cooling module 271. At least part of the cooling module 271 is arranged in the gas chamber enclosed by the flow guide housing 2721. During the driving of the ATV 100, the flow guide mechanism 272 guides the air flowing in the direction of the ATV 100 into the gas chamber enclosed by the flow guide housing 2721 through the air inlet 2722. The cooling module 271 arranged in the gas chamber enclosed by the flow guide housing 2721 removes the heat generated by the air flow, thereby increasing the heat dissipation effect of the cooling module 271 of the ATV 100.

[0042] As Figure 7 and Figure 8As shown, the air inlet 2722 includes an air inlet opening 2722a, an extending straight line of the air inlet opening 2722a is defined as an air inlet extending straight line 305, a longitudinal plane 102 perpendicular to the width direction of the ATV is defined, and an angle a2 between the air inlet extending straight line 305 and the longitudinal plane 102 is greater than or equal to 30° and less than or equal to 70°. The orientation of the air inlet opening 2722a has an important influence on the air inlet amount, and the orientation of the air inlet opening 2722a is set in the above range, so that the air inlet opening 2722a can better utilize the air guiding effect of the door assembly 29, and meanwhile the orientation of the air inlet opening 2722a is matched with the driving direction of the ATV, thereby further increasing the air inlet amount. Further, the angle a2 between the first straight line and the longitudinal plane 102 is greater than or equal to 40° and less than or equal to 60°. Further, the angle a2 between the air inlet extending straight line 305 and the longitudinal plane 102 is greater than or equal to 45° and less than or equal to 65°. The angle a3 between the air inlet extending straight line 305 and the reference plane 103 is greater than or equal to 0° and less than or equal to 30°. Further, the angle a3 between the air inlet extending straight line 305 and the reference plane 103 is greater than or equal to 5° and less than or equal to 25°. Further, the angle a3 between the air inlet extending straight line 305 and the reference plane 103 is greater than or equal to 10° and less than or equal to 20°. In the height direction of the ATV, the flow guide shell 2721 at least partially overlaps with the power system 15, and the overlapping arrangement improves the space utilization of the ATV 100. The ratio of the size L7 of the flow guide mechanism 272 in the width direction of the ATV to the size L8 of the flow guide shell 2721 in the width direction of the ATV is greater than or equal to 1.1 and less than or equal to 2.2. The air inlet 2722 in the flow guide mechanism 272 is arranged on both sides of the flow guide shell 2721, and the width of the flow guide shell 2721 is narrower, and the size of the flow guide shell 2721 is smaller, so that the airflow introduced by the air inlet 2722 can form airflow with higher speed in the flow guide shell 2721, which is beneficial to improve the heat dissipation efficiency. Further, the ratio of the size L7 of the flow guide mechanism 272 in the width direction of the ATV to the size L8 of the flow guide shell 2721 in the width direction of the ATV is greater than or equal to 1.3 and less than or equal to 2.1. Further, the ratio of the size L7 of the flow guide mechanism 272 in the width direction of the ATV to the size L8 of the flow guide shell 2721 in the width direction of the ATV is greater than or equal to 1.5 and less than or equal to 1.9. The projection of the air inlet 2722a in the length direction of the ATV on the transverse plane is an air inlet projection, and the area of the air inlet projection is greater than or equal to 700 square centimeters and less than or equal to 1600 square centimeters. The above air inlet projection is the projection of all air inlets 2722a of the air inlets 2722 of the flow guide mechanism 272 on the transverse plane in the length direction of the ATV. The size of the air inlet 2722a is set in the above range, which can meet the requirement of the heat dissipation air amount and avoid the problem of excessive width of the ATV 100 caused by the air inlet 2722a being too large.

[0043] As shown in Figure 8 , the bottom of the flow guide shell 2721 is inclined, and the space present at the bottom of the flow guide shell 2721 can be used as a maintenance space for other elements of the engine 151 at this position, increasing the maintenance space of the all-terrain vehicle 100 to facilitate maintenance. The extension plane of the bottom of the flow guide shell 2721 is defined as the bottom extension plane 306, and the included angle a4 between the bottom extension plane 306 and the reference plane 103 is greater than or equal to 10° and less than or equal to 30°. The inclined arrangement of the bottom of the flow guide shell 2721 can serve to avoid the power system 15, and at the same time, the bottom of the flow guide shell 2721 can also increase the airflow introduced to the power system 15 when the all-terrain vehicle 100 is running, improving the passive heat dissipation efficiency of the power system 15. Further, the included angle a4 between the bottom extension plane 306 and the reference plane 103 is greater than or equal to 15° and less than or equal to 25°. Further, the included angle a4 between the bottom extension plane 306 and the reference plane 103 is greater than or equal to 17° and less than or equal to 22°. The flow guide shell 2721 is also provided with a detachable cover plate. The detachable cover plate can increase the maintenance convenience of the power system 15 related components located below the flow guide shell 2721. The flow guide shell 2721 and the air inlet 2722 are integrally formed, and the integral forming can increase the strength. The flow guide mechanism 272 can be made of plastic material. Plastic material has the characteristics of lightness, and using plastic material as the flow guide mechanism 272 can reduce the weight of the vehicle body and improve the performance of the vehicle body.

[0044] As shown in Figure 8As shown, the air inlet 2722a further comprises an upper air inlet 2722b, which is arranged at the upper portion of the air inlet 2722a. The power system 16 comprises a transmission 166 and a transmission air inlet pipe 1661, one end of the transmission air inlet pipe 1661 is connected to the upper air inlet 2722b, and the other end of the transmission air inlet pipe 1661 is connected to the transmission 166. The transmission air inlet pipe 1661 is connected between the upper air inlet 2722b and the transmission 166, and is used to provide cooling air for the transmission 166. The power system comprises an air filter 153 and an air filter air inlet pipe 154, one end of the air filter air inlet pipe 154 is connected to the upper air inlet 2722b, and the other end of the air filter air inlet pipe 154 is connected to the air filter 153. The air filter 153 is used to filter the air intake of the engine 151 in the power system, reduce impurities in the air intake, and ensure the normal operation of the engine 151. The air filter air inlet pipe 154 is connected between the upper air inlet 2722b and the air filter 153, and can provide clean air required by the air filter 153 and the engine 151. The transmission air inlet pipe 1661 and the air filter air inlet pipe 154 are connected to the same upper air inlet 2722b, which can reduce the layout length of the air inlet pipe, and can make the layout of the transmission air inlet pipe 1661 and the air filter air inlet pipe 154 more compact, thereby saving the rear space of the ATV 100. At the same time, the upper air inlet 2722b is arranged at a high position in the ATV 100, so that the air intake positions of the air filter 153 and the transmission 166 are also arranged at high positions, so that the air intake of the air filter 153 and the transmission 166 has good cleanliness, and the operation stability of the transmission 166 and the engine 151 can be improved.

[0045] As shown in Figure 8 The transmission 166 further comprises a transmission exhaust port 1662. In the length direction of the ATV, the transmission exhaust port 1662 is arranged towards the rear. After the transmission exhaust port 1662 is arranged towards the rear, the exhaust gas of the transmission 166 can blow towards the exhaust gas of the engine 151. After such arrangement, firstly, the air flowability at the rear of the engine 151 can be increased, and secondly, the exhaust gas of the engine 151 with high temperature can be diluted by the exhaust gas of the transmission 166 with low temperature, so as to reduce the exhaust gas temperature and improve the heat dissipation efficiency of the rear of the ATV 100.

[0046] As shown in Figure 9As shown, the all-terrain vehicle 100 includes door assemblies 29 arranged on both sides of the all-terrain vehicle 100. In the length direction of the all-terrain vehicle 100, the door assemblies 29 are located in front of the air inlet members 2722. The door assemblies 29 are located in front of the air inlet members 2722, which can ensure that the air inlet members 2722 do not interfere with the opening and closing of the door assemblies 29. Define a transverse plane perpendicular to the length direction of the all-terrain vehicle, the projection of the air inlet member 2722 on the transverse plane along the length direction of the all-terrain vehicle 100 is the air inlet member projection, the projection of the door assembly 29 on the transverse plane along the length direction of the all-terrain vehicle 100 is the door projection, and the door projection is located between the two air inlet member projections. Through the above arrangement, the air inlet member 2722 can be prevented from being blocked by the door assembly 29, and at the same time, the door assembly 29 can be used to guide the air for the air inlet member 2722, increase the air volume entering the air inlet member 2722, and improve the air inlet efficiency of the air inlet member 2722. The flow guide mechanism 272 further includes an auxiliary air inlet member 2723 arranged at the front end of the flow guide housing 2721. The auxiliary air inlet member 2723 is arranged in the middle of the flow guide mechanism 272 and close to the upper position. The auxiliary air inlet member 2723 has an auxiliary air inlet function and guides the air together with the air inlet member 2722 to enter the all-terrain vehicle 100. The arrangement of the auxiliary air inlet member 2722 can improve the air guiding effect of the flow guide mechanism 272 and improve the heat dissipation capacity of the all-terrain vehicle 100. In the length direction of the all-terrain vehicle, the auxiliary air inlet member 2723 partially overlaps the seat assembly 23. The seat assembly 23 has little effect on the partially overlapping auxiliary air inlet member 2723, while the remaining part can maximize the auxiliary air inlet and air guiding functions. In addition, the partially overlapping arrangement can save space in the all-terrain vehicle 100 and improve the space utilization of the all-terrain vehicle 100. The above arrangement allows the auxiliary air inlet member 2723 to be arranged substantially above the seat, reducing the influence of the seat on the auxiliary air inlet and air guiding functions of the auxiliary air inlet member 2723, and improving the auxiliary air inlet and air guiding functions of the auxiliary air inlet member 2723. In the height direction of the all-terrain vehicle 100, the top end of the seat assembly 23 is higher than the bottom end of the auxiliary air inlet member 2723, and the top end of the seat assembly 23 is lower than the top end of the auxiliary air inlet member 2723. The above arrangement allows the auxiliary air inlet member 2723 to be arranged substantially above the seat, reducing the influence of the seat on the auxiliary air inlet and air guiding functions of the auxiliary air inlet member 2723, and improving the auxiliary air inlet and air guiding functions of the auxiliary air inlet member 2723. The auxiliary air inlet member 2723 and the seat assembly 23 partially overlap in the height direction of the all-terrain vehicle 100, which can further improve the compactness of the structure of the auxiliary air inlet member 2723 and the seat assembly 23. In the height direction of the all-terrain vehicle, the distance L9 between the top end of the air inlet member 2722 and the bottom end of the air inlet member 2722 is greater than or equal to 650 mm and less than or equal to 1250 mm.The dimension of the air intake 2722 in the height direction of the ATV is within the above range, so that the air intake 2722 can increase the air intake amount as much as possible by the door assembly, and meanwhile, the size of the air intake 2722 does not affect the arrangement of the cargo box and other components. Further, the distance L9 between the top end of the air intake 2722 and the bottom end of the air intake 2722 is greater than or equal to 750 mm and less than or equal to 1150 mm. Further, the distance L9 between the top end of the air intake 2722 and the bottom end of the air intake 2722 is greater than or equal to 850 mm and less than or equal to 1050 mm.

[0047] The projection of the flow guide mechanism 272 on the lateral plane in the length direction of the ATV is defined as the flow guide mechanism projection, and the projection of the auxiliary air intake 2723 on the lateral plane in the length direction of the ATV is defined as the auxiliary air intake projection. The auxiliary air intake 2723 occupies a certain proportion on the flow guide mechanism 272 to better assist the flow guide mechanism 272 in guiding air. When the size of the auxiliary air intake 2723 on the flow guide mechanism 272 is less than 0.21, the size of the auxiliary air intake 2723 on the flow guide mechanism 272 is small, and the auxiliary air intake 2723 has a small effect on assisting air intake and guiding air, and the effect of the auxiliary air intake 2723 on assisting air intake of the flow guide mechanism 272 is small. When the size of the auxiliary air intake 2723 on the flow guide mechanism 272 is greater than 0.39, the size of the auxiliary air intake 2723 on the flow guide mechanism 272 is large, which affects the spatial structure of the flow guide mechanism 272. In summary, the ratio of the dimension of the auxiliary air intake projection in the width direction of the ATV to the dimension of the flow guide mechanism projection in the width direction of the ATV is greater than or equal to 0.2 and less than or equal to 0.4. Further, the ratio of the dimension of the auxiliary air intake projection in the width direction of the ATV to the dimension of the flow guide mechanism projection in the width direction of the ATV is greater than or equal to 0.24 and less than or equal to 0.36. Further, the ratio of the dimension of the auxiliary air intake projection in the width direction of the ATV to the dimension of the flow guide mechanism projection in the width direction of the ATV is greater than or equal to 0.27 and less than or equal to 0.33.

[0048] As Figure 4 and Figure 10As shown, as an embodiment, the cooling module 271 further comprises a fixed frame 2714 connected to the vehicle frame 11. The fixed frame 2714 comprises a first mounting surface 2714a to which the fan device 2713 is connected, a second mounting surface 2714b to which the radiator 2712 is connected, and a middle cooler 2711. The fan device 2713, the radiator 2712, and the middle cooler 2711 form an integrated whole through the fixed frame 2714, achieving integrated arrangement of the fan device 2713, the radiator 2712, and the middle cooler 2711, saving installation space of the ATV 100 and improving space utilization of the ATV 100. Meanwhile, integrated arrangement of the cooling module 271 can reduce the connection points of the vehicle frame 11 and the installation supports on the vehicle frame 11, improving assembly efficiency. The middle cooler 2711, the radiator 2712, and the fan device 2713 can be assembled to the fixed frame 2714 first when the ATV 100 is installed, and then the cooling module 271 is assembled to the vehicle frame 11 as a whole, saving installation and assembly processes. The extension plane of the fixed frame 2714 is defined as the fixed frame plane, and the fixed frame perpendicular line perpendicular to the fixed frame plane is defined. The ratio of the size L1 of the cooling module 271 along the fixed frame perpendicular line to the size L10 of the fixed frame 2714 along the width direction of the ATV is greater than or equal to 0.16 and less than or equal to 0.32. After the cooling module 271 is arranged in the above manner, the thickness of the cooling module 271 can be reduced. Further, the ratio of the size L1 of the cooling module 271 along the fixed frame perpendicular line to the size L10 of the fixed frame 2714 along the width direction of the ATV is greater than or equal to 0.19 and less than or equal to 0.29. Further, the ratio of the size L1 of the cooling module 271 along the fixed frame perpendicular line to the size L10 of the fixed frame 2714 along the width direction of the ATV is greater than or equal to 0.21 and less than or equal to 0.27. In the width direction of the ATV, the radiator 2712 coincides with the fixed frame 2714 and is arranged in the fixed frame 2714, so that the fixed frame 2714 can protect the radiator 2712. The ratio of the size of the radiator 2712 along the fixed frame perpendicular line to the size of the fixed frame 2714 along the fixed frame perpendicular line is greater than or equal to 0.6 and less than or equal to 1.2. The thickness of the radiator 2712 is basically the same as that of the fixed frame 2714, so that the radiator 2712 can be arranged in the fixed frame 2714 and be better protected. Further, the ratio of the size of the radiator 2712 along the fixed frame perpendicular line to the size of the fixed frame 2714 along the fixed frame perpendicular line is greater than or equal to 0.7 and less than or equal to 1.1.Furthermore, the ratio of the dimension of the radiator 2712 along the vertical direction of the fixed frame to the dimension of the fixed frame 2714 along the vertical direction of the fixed frame is greater than or equal to 0.8 and less than or equal to 1.0.

[0049] like Figure 10 As shown, mounting surface 2714a has at least three fan mounting brackets 2714b for fixing the fan assembly 2713, and mounting surface 2714a has at least three heat sink mounting brackets 2714c for fixing the heat sink 2712. To ensure the connection strength between the fan assembly 2713 and the heat sink 2712 and the fixed frame 2714, fan mounting brackets 2714b and heat sink mounting brackets 2714c are respectively provided on the fixed frame 2714, thereby improving the connection strength between the fan assembly 2713 and the heat sink 2712 on the fixed frame 2714. In the vertical direction of the fixed frame, the distance between the fan mounting bracket 2714b and the mounting surface 2714a is greater than or equal to the distance between the heat sink mounting bracket 2714c and the mounting surface 2714a. With the above arrangement, the fan assembly 2713 is mounted outside the heat sink 2712, facilitating heat dissipation from the heat sink 2712 by the fan assembly 2713. Specifically, the radiator mounting bracket 2714c has at least two insertion holes and at least one fixing hole. The radiator 2712 is connected to the fixed frame 2714 through the insertion holes and fixing holes. The insertion holes facilitate the installation of the radiator 2712 onto the fixed frame 2711, reducing the assembly difficulty of the radiator 2712. The insertion holes and fixing holes work together to improve the connection stability between the radiator 2712 and the fixed frame 2714. The fixed frame 2714 has at least three connecting seats 2714d for connecting the fixed frame 2714 to the vehicle frame 11. The connecting seats 2714d on the fixed frame 2714 serve as the connection structure between the cooling module 271 and the vehicle frame 11. The presence of at least three connecting seats 2714d for connecting the fixed frame 2714 to the vehicle frame 11 ensures the reliability of the connection between the fixed frame 2714 and the vehicle frame 11, thereby improving the reliability of the connection between the cooling module 271 and the vehicle frame 11. The mounting frame 2714 can be made of plastic, which is lightweight and reduces vehicle weight, thus improving performance. Plastic is also a good insulator and chemically stable, exhibiting excellent resistance to acids and alkalis. Using plastic for the mounting frame 2714 allows it to withstand various vehicle conditions, extending its service life. The mounting frame plane is parallel to the cooling module plane.

[0050] The all-terrain vehicle 100 includes a control system 26, which is located in the frame 11 and is at least partially connected to a fan unit 2713. Figure 11As shown, the fan device 2713 includes a fan 2713a for generating airflow, and a control circuit 2713b connected to the fan 2713a. The fan 2713a can flow the airflow to cool the cooling module 271. The control circuit 2713b includes a high-speed circuit 2713c and a low-speed circuit 2713d connected in parallel. When the fan 2713a is connected to the high-speed circuit 2713c, the fan 2713a operates at a high speed. When the fan 2713a is connected to the low-speed circuit 2713d, the fan 2713a operates at a low speed. The all-terrain vehicle 100 can set the fan 2713a speed according to the power of the engine 151 or according to the temperature control adjustment of the temperature sensor 273 arranged on the engine 151 or the cooling module 271. When the fan device 2713 is connected to the low-speed circuit 2713d and operates at a low speed, the energy consumption of the all-terrain vehicle 100 can be reduced, and the service life of the fan device 2713 can be improved. When the fan device 2713 operates at a low speed, the fan device 2713 is also more quiet, which can improve the driving comfort. When the fan device 2713 is connected to the high-speed circuit 2713c and operates at a high speed, the heat dissipation effect of the all-terrain vehicle 100 under high temperature conditions can be improved. The control system 26 includes a vehicle controller 261 and a fan controller 262 electrically connected to the vehicle controller 261. The high-speed circuit 2713c and the low-speed circuit 2713d are connected to the fan controller 262 in parallel. The vehicle controller 261 can output a speed control signal to control the fan controller 262 to turn on the low-speed circuit 2713d or the high-speed circuit 2713c. The fan controller 262 controls the fan 2713a to switch between the low-speed circuit 2713d and the high-speed circuit 2713c, which can improve the efficiency of the fan 2713a speed control. The fan controller 262 can control the fan 2713a to switch between a first fan state, a second fan state and a third fan state. When the fan 2713a is in the first fan state, the fan 2713a does not work. When the fan 2713a is in the second fan state, the fan 2713a works at a low speed. When the fan 2713a is in the third fan state, the fan 2713a works at a high speed. The fan device 2713 includes at least two fans 2713a, and the fans 2713a are distributed along the width direction of the all-terrain vehicle 100. Arranging multiple fans 2713a in the fan device 2713 can improve the heat dissipation performance, which can meet the heat dissipation requirements of the integrated cooling module 271 and the high-power engine 151. The fan device 2713 includes two sets of independently arranged control circuits 2713b. The two fans 2713a are independently connected to the control circuits 2713b and can independently operate in the first fan state, the second fan state or the third fan state. The operating state of different fans 2713a is not affected by other fans 2713a, thereby improving the overall working efficiency of the fan device 2713. The cooling system 27 further includes a temperature sensor 273 connected to the vehicle controller 261 to output a temperature signal to the vehicle controller 261.The temperature sensor 273 can feed back the temperature signal of the whole vehicle, so as to facilitate the cooling system 27 to control and cool the whole vehicle in time. The whole vehicle controller 261 receives the temperature signal given by the temperature sensor 273 and outputs the speed control signal to the fan controller 262 according to the temperature signal, and the fan controller 262 switches between the high-speed loop 2713c and the low-speed loop 2713d according to the speed control signal. The speed of the fan 2713a can be controlled according to the temperature of the all-terrain vehicle 100. The temperature sensor 273 is arranged in the radiator 2712 or in the engine 151. The temperature sensor 273 arranged in the radiator 2712 and the engine 151 can monitor the temperature of the all-terrain vehicle 100 in time when the all-terrain vehicle 100 is running, and feed back to the cooling module 271 to cool the all-terrain vehicle 100 in time.

[0051] The control system 26 includes a power supply 263, and the fan controller 262 is further connected to the power supply 263. The power supply 263 supplies power to the fan controller 262, and the fan controller 262 connects the high-speed loop 2713c to the power supply 263 or connects the low-speed loop 2713d to the power supply 263 according to the speed control signal. After the fan controller 262 connects the high-speed loop to the power supply 263, the fan 2713a can operate at high speed to improve the cooling efficiency of the cooling module 271. After the fan controller 262 connects the low-speed loop to the power supply 263, the fan 2713a can operate at low speed to reduce energy consumption and noise while meeting the cooling requirements. The control system 26 includes a fan fuse 264, which is arranged between the fan controller 262 and the power supply 263. The fan fuse 264 can cut off the circuit in time when the circuit is abnormal, thereby improving the safety of the all-terrain vehicle 100.

[0052] The cooling system 27 includes an oil cooler 274 for cooling the lubricating oil in the engine 151. As shown in FIG. 6, the oil cooler 274 is arranged in the cooling module 271. Figure 12 and Figure 13As shown, the radiator 2712 includes at least one cooling chamber 2712a and a plurality of fins 2712b connected to the cooling chamber 2712a, the cooling chamber 2712a provides a storage space for the coolant, the fins 2712b serve to cool the coolant, and the fins 2712b can increase the contact area between the coolant and the air. The two ends of the radiator 2712 are connected to the engine 151, and the two ends of the oil cooler 274 are connected to the engine 151, and the oil cooler 274 is arranged in the cooling chamber 2712a. Define the extension plane of the radiator 2712 as the radiator plane, define a radiator vertical line perpendicular to the radiator plane, define the projection of the oil cooler in the radiator plane along the radiator vertical line as the oil cooler projection, define the projection of the cooling chamber in the radiator plane along the radiator vertical line as the cooling chamber projection, and the oil cooler projection is completely located in the cooling chamber projection. The oil cooler 274 is arranged in the radiator 2712, and the oil cooler 274 can directly use the coolant in the radiator 2712 for cooling, and compared with the cooling mode relying on air alone, the coolant cooling has higher cooling efficiency. At the same time, the oil cooler 274 arranged in the cooling chamber 2712a of the radiator 2712 can also occupy less space and improve the space utilization. At the same time, the integrated arrangement of the radiator 2712 and the oil cooler 274 can also reduce the assembly difficulty and improve the assembly efficiency of the all-terrain vehicle 100. The ratio of the area of the oil cooler projection to the area of the cooling chamber projection is greater than or equal to 0.31 and less than or equal to 0.59. Further, the ratio of the area of the oil cooler projection to the area of the cooling chamber projection is greater than or equal to 0.36 and less than or equal to 0.54. Further, the ratio of the area of the oil cooler projection to the area of the cooling chamber projection is greater than or equal to 0.4 and less than or equal to 0.5. Define the extension direction of the cooling chamber 2712a as the cooling chamber extension direction, and the oil cooler 274 also extends along the cooling chamber extension direction. In the cooling chamber extension direction, the ratio of the size L11 of the oil cooler 274 to the size L12 of the cooling chamber 2712a is greater than or equal to 0.38 and less than or equal to 0.72. The ratio of the length of the oil cooler 274 to the length of the cooling chamber 2712a is in the above range, which can improve the cooling effect of the oil cooler 274 and also ensure the storage space of the coolant in the cooling chamber 2712a. Further, in the cooling chamber extension direction, the ratio of the size L11 of the oil cooler 274 to the size L12 of the cooling chamber 2712a is greater than or equal to 0.44 and less than or equal to 0.66. Further, in the cooling chamber extension direction, the ratio of the size L11 of the oil cooler 274 to the size L12 of the cooling chamber 2712a is greater than or equal to 0.49 and less than or equal to 0.61. The oil cooler 274 includes an oil cooler inlet 2741 and an oil cooler outlet 2742, and the oil cooler inlet 2741 and the oil cooler outlet 2742 pass through the cooling chamber and are connected to the engine 151. In the height direction of the all-terrain vehicle, the oil cooler inlet 2741 is located below the oil cooler outlet 2742.The high-temperature lubricating oil enters the oil cooler 274 from the oil cooler inlet 2741, is cooled in the oil cooler 274, and is discharged from the oil cooler 274 from the oil cooler outlet 2742, so as to realize the circulation cooling of the lubricating oil in the oil cooler 274. The oil cooler inlet 2741 is located below the oil cooler outlet 2742, and the high-temperature lubricating oil entering the oil cooler 274 from the oil cooler inlet 2741 contacts the cooling liquid of a lower temperature to realize heat exchange, so as to improve the heat exchange efficiency and reduce the cooling time of the lubricating oil.

[0053] The engine 151 comprises an engine outlet (not shown in the figure) for discharging the cooling liquid and an engine inlet (not shown in the figure) for receiving the cooling liquid. The radiator 2712 comprises a high-temperature side cooling chamber 2712c connected to the cooling liquid outlet and a low-temperature side cooling chamber 2712d connected to the cooling liquid inlet. The radiator fins 2712b are arranged through the high-temperature side cooling chamber 2712c and the low-temperature side cooling chamber 2712d. The radiator inlet 2712e is arranged in the high-temperature side cooling chamber 2712c, and the radiator outlet 2712f is arranged in the low-temperature cooling chamber. The radiator 2712 further comprises the radiator inlet 2712e arranged in the high-temperature side cooling chamber 2712c and the radiator outlet 2712f arranged in the low-temperature cooling chamber 2712d, the radiator inlet 2712e is connected to the engine outlet, and the radiator outlet 2712f is connected to the engine inlet. In the height direction of the ATV, the height of the radiator inlet 2712e is above the height of the radiator outlet 2712f. In the working process of the radiator 2712, the high-temperature cooling liquid first enters the high-temperature side cooling chamber 2712c of the radiator 2712 from the radiator inlet 2712e, is cooled by the radiator fins 2712b arranged through the high-temperature side cooling chamber 2712c and the low-temperature side cooling chamber 2712d, and then enters the low-temperature side cooling chamber 1612d, cools the oil cooler 274, and is discharged from the radiator outlet 2712f to complete the heat dissipation. The radiator 2712 can be made of metal materials such as aluminum, copper, stainless steel or castings, and the oil cooler 274 can also be made of metal materials such as aluminum, copper, stainless steel or castings.

[0054] As an embodiment, the cooling system 27 further comprises a cooling water bottle 275, one part of the cooling water bottle 275 is connected to the engine 151, and the other part of the cooling water bottle 275 is connected to the radiator 2712. Further, in the length direction of the all-terrain vehicle 100, the cooling water bottle 275 is arranged behind the upper air inlet 2722b. Arranging the cooling water bottle 275 behind the upper air inlet 2722b can utilize the air in the upper air inlet 2722b for heat dissipation, thereby improving the overall heat dissipation efficiency of the cooling system 27. Specifically, the cooling water bottle 275 is arranged on the all-terrain vehicle 100 opposite the transmission air pipe 1661 and the air filter air pipe 154, and the cooling water bottle 275 and the transmission air pipe 1661 and the air filter air pipe 154 are arranged on both sides of the all-terrain vehicle 100, which can increase the space utilization rate on both sides of the all-terrain vehicle 100. As shown in FIG. 1, the cooling water bottle 275 is arranged on the all-terrain vehicle 100 opposite the transmission air pipe 1661 and the air filter air pipe 154, and the cooling water bottle 275 and the transmission air pipe 1661 and the air filter air pipe 154 are arranged on both sides of the all-terrain vehicle 100, which can increase the space utilization rate on both sides of the all-terrain vehicle 100. Figure 14As shown, the cooling water kettle 275 includes a kettle body 2751 and a pressure cover 2752 connected to the kettle body 2751. Specifically, the pressure cover 2752 includes a pressure valve capable of bidirectional communication. The pressure cover 2752 includes a closed state of closing the kettle body 2751 and a communication state of making the kettle body 2751 communicate with the air, when the pressure in the kettle body 2751 is greater than the first critical pressure and less than the second critical pressure, the pressure valve in the pressure cover 2752 is closed, so that the pressure cover 2752 is in a closed state, when the pressure in the kettle body 2751 is less than the first critical pressure or greater than the second critical pressure, the pressure valve in the pressure cover 2752 is opened, so that the pressure cover 2752 is in a communication state, the first critical pressure is less than the second critical pressure. The cooling water kettle 275 provided with the pressure cover 2752 is basically a closed environment, and the closed cooling water kettle 275 can reduce the loss of cooling liquid and improve the operation stability of the cooling system 27. The cooling water kettle 275 can balance the liquid level and pressure in the radiator 2712 and the engine 151, and the pressure cover 2752 can adjust the pressure of the cooling water kettle 275. During the driving of the ATV 100, the temperature of the cooling liquid in the engine 151 will slowly rise, and the pressure in the engine 151 will also rise. The high-temperature and high-pressure cooling liquid in the engine 151 will affect the performance and service life of the engine 151, and the high-temperature and high-pressure cooling liquid contains steam bubbles, which will cause cavitation in the engine 151 and affect the operation stability of the engine 151. After the ATV 100 is provided with the cooling water kettle 275, the cooling water kettle 275 and the engine 151 are communicated, and the cooling liquid can move between the engine 151 and the cooling water kettle 275. When the pressure in the cooling water kettle 275 is less than the first critical pressure, the pressure cover 2752 of the cooling water kettle 275 is opened, and the air in the environment can enter the cooling water kettle 275 to balance the pressure in the cooling water kettle 275. When the pressure in the cooling water kettle 275 is too high, the pressure cover 2752 of the cooling water kettle 275 is opened, and the excess steam in the cooling water kettle 275 can be discharged to the environment. By providing the cooling water kettle 275 with the pressure cover 2752, the situation of too low or too high pressure in the cooling system 27 can be prevented, and the pressure of the engine 151 is ensured to be in an appropriate range, thereby improving the reliability of the engine 151. Specifically, the first critical pressure is greater than or equal to -10 kPa and less than or equal to 0 kPa, and the second critical pressure is greater than or equal to 90 kPa and less than or equal to 170 kPa. Further, the first critical pressure is greater than or equal to -7 kPa and less than or equal to -3 kPa, and the second critical pressure is greater than or equal to 100 kPa and less than or equal to 160 kPa. Further, the first critical pressure is greater than or equal to -6 kPa and less than or equal to -4 kPa, and the second critical pressure is greater than or equal to 115 kPa and less than or equal to 145 kPa.

[0055] The cooling water tank 275 further comprises a first degassing port 2753 for communicating with the engine 151, a second degassing port 2754 for communicating with the radiator 2712, and a water supplement port 2755 for supplementing cooling liquid into the radiator 2712. The first degassing port 2753 is communicated with the engine 151 through a pipe, and the first degassing port 2753 and the engine 151 are connected to ensure pressure balance in the engine 151. The second degassing port 2754 is communicated with the radiator 2712 through a pipe, and the second degassing port 2754 and the radiator 2712 are connected to ensure pressure balance in the radiator 2712. The water supplement port 2755 is communicated with the radiator 2712 through a pipe, and the water supplement port 2755 is used for supplementing cooling liquid into the radiator 2712 to ensure liquid level balance in the cooling system 27. The diameter of the first degassing port 2753 is smaller than that of the water supplement port 2755, and the diameter of the second degassing port 2754 is smaller than that of the water supplement port 2755, so that the first degassing port 2753 and the second degassing port 2754 only need to meet the gas flow requirement, and the smaller diameter can also reduce the occupied space. The radiator 2712 comprises a radiator degassing port 2712g and a radiator water supplement port 2712h, and the radiator degassing port 2712g is arranged above the radiator water supplement port 2712h in the height direction of the ATV. The second degassing port 2754 in the cooling water tank 275 is connected to the radiator 2712, and the high-temperature and high-pressure cooling liquid and steam in the radiator 2712 are discharged into the cooling water tank 275 through the second degassing port 2754 to reduce the gas pressure in the radiator 2712 and prevent the pressure in the radiator 2712 from being too high. The cooling water tank 275 has simple overall structure and cooling process, and meets the engine 151 end degassing and radiator 2712 end degassing functions at the same time.

[0056] It should be understood that, for those skilled in the art, improvements or changes can be made according to the above description, and all these improvements and changes shall belong to the protection scope of the appended claims of the present application.

Claims

1. An all-terrain vehicle, comprising, a frame, the frame comprising a rear frame disposed at a rear portion of the all-terrain vehicle; a power system supported by the frame; a transmission system at least partially connected to the power system; a walking assembly at least partially connected to the transmission system; a cooling system at least partially connected to the power system; a door assembly connected to the frame; characterized in that: the cooling system is supported by the rear frame, the cooling system comprising a cooling module at least partially connected to the power system and a guide mechanism for guiding air for the cooling module, the guide mechanism comprising a guide housing and air inlet members disposed on both sides of the guide housing; defining a transverse plane perpendicular to a length direction of the all-terrain vehicle, a projection of the air inlet members on the transverse plane along the length direction of the all-terrain vehicle is an air inlet member projection, a projection of the door assembly on the transverse plane along the length direction of the all-terrain vehicle is a door projection, the door projection is located between the two air inlet member projections; the guide mechanism further comprises an auxiliary air inlet member, the auxiliary air inlet member is disposed at a front end of the guide housing, the all-terrain vehicle further comprises a seat assembly, in the length direction of the all-terrain vehicle, the auxiliary air inlet member partially overlaps the seat assembly, a top end of the seat assembly is disposed higher than a bottom end of the auxiliary air inlet member and the top end of the seat assembly is disposed lower than a top end of the auxiliary air inlet member.

2. The all-terrain vehicle according to claim 1, characterized in that: in the length direction of the all-terrain vehicle, the door assembly is located in front of the air inlet members.

3. The all-terrain vehicle according to claim 1, characterized in that: the air inlet members comprise air inlets, defining an extending straight line of the air inlets as an air inlet extending straight line, defining a longitudinal plane perpendicular to a width direction of the all-terrain vehicle, defining a reference plane perpendicular to a height direction of the all-terrain vehicle, an angle between the air inlet extending straight line and the longitudinal plane is greater than or equal to 30° and less than or equal to 70°, an angle between the air inlet extending straight line and the reference plane is greater than or equal to 0° and less than or equal to 30°.

4. The all-terrain vehicle according to claim 3, characterized in that: the air inlets comprise upper air inlets, the upper air inlets are disposed at upper portions of the air inlets, the transmission system further comprises a transmission and a transmission air inlet pipe, one end of the transmission air inlet pipe is connected to the upper air inlets, the other end of the transmission air inlet pipe is connected to the transmission, the power system further comprises an air filter and an air filter air inlet pipe, one end of the air filter air inlet pipe is connected to the upper air inlets, the other end of the air filter air inlet pipe is connected to the air filter.

5. The all-terrain vehicle according to claim 3, characterized in that: The air inlet comprises an upper air inlet arranged at an upper portion of the air inlet, and the cooling system further comprises a cooling water tank, one portion of the cooling water tank being connected to the power system and another portion of the cooling water tank being connected to the cooling module; in the length direction of the ATV, the cooling water tank is arranged rearward of the upper air inlet.

6. The ATV of claim 1, wherein: The transmission system further comprises a transmission, and the transmission comprises a transmission exhaust port, the transmission exhaust port being arranged rearward in the length direction of the ATV.

7. The ATV of claim 1, wherein: The flow guide housing, the air inlet member and the auxiliary air inlet member are integrally formed.

8. The ATV of claim 1, wherein: A transverse plane perpendicular to the length direction of the ATV is defined, a projection of the flow guide mechanism on the transverse plane in the length direction of the ATV is a flow guide mechanism projection, a projection of the auxiliary air inlet member on the transverse plane in the length direction of the ATV is an auxiliary air inlet member projection, and a ratio of a dimension of the auxiliary air inlet member projection in the width direction of the ATV to a dimension of the flow guide mechanism projection in the width direction of the ATV is greater than or equal to 0.2 and less than or equal to 0.

4.

9. The ATV of claim 1, wherein: The cooling system comprises a cooling module, the cooling module being connected to the rear frame, the cooling module comprising an intercooler, a radiator and a fan device, the fan device being arranged at one side of the radiator and the intercooler being arranged at another side of the radiator.

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