All-terrain vehicle

Abstract

The all-terrain vehicle comprises a vehicle frame, a vehicle body covering part, a walking system, a suspension system and an engine, the engine comprises an air cylinder and an exhaust passage, and an exhaust assembly comprises an exhaust pipe connected with the exhaust passage and a silencer connected with the exhaust pipe; the stepless speed change mechanism comprises a driving wheel and a driven wheel; the driving wheel is located behind the driven wheel, an opening of an included angle between a projection line of the axis of the air cylinder and a projection connecting line faces the rear portion of the all-terrain vehicle, and the included angle ranges from 35 degrees to 75 degrees. Through the arrangement, the overall length of the exhaust pipe in the all-terrain vehicle can be shortened, so that the exhaust pipe is prevented from interfering with assembly of other parts, the overall heat of the all-terrain vehicle can be reduced, and the driving comfort of the all-terrain vehicle is improved.

Description

Technical Field

[0001] The present application relates to the technical field of vehicles, and in particular, to an all-terrain vehicle. Background Art

[0002] An all-terrain vehicle is a multi-functional vehicle designed specifically for various complex terrains. It has powerful off-road capabilities and stability, and can easily travel in complex environments such as mud, sand, snow, and rocks.

[0003] An all-terrain vehicle generally includes a frame, a body cover, a running system, a suspension system, a power assembly, and electrical components. The exhaust pipe in the all-terrain vehicle is used to connect the engine and the outside, so that the exhaust gas generated during the operation of the engine can be discharged to the outside through the exhaust pipe.

[0004] In the prior art, when the cylinder head of the engine is set facing backward and the exhaust pipe is set facing forward, the length of the exhaust pipe arranged in the all-terrain vehicle is too long, which in turn leads to an overly large volume of the exhaust pipe, causing interference with the assembly of other components. In addition, the overly long exhaust pipe will also cause an increase in the flow time of the exhaust gas in the all-terrain vehicle, resulting in a large amount of heat in the exhaust gas being transferred to the interior of the all-terrain vehicle, making the overall temperature of the all-terrain vehicle too high, and thus reducing the comfort of the driver and passengers when driving and riding in the all-terrain vehicle.

[0005] Therefore, how to improve the driving comfort of an all-terrain vehicle is a technical problem urgently to be solved in this field. Summary of the Invention

[0006] In order to solve the deficiencies of the prior art, the purpose of the present application is to provide an all-terrain vehicle with relatively high driving comfort.

[0007] To achieve the above purpose, the present application adopts the following technical solutions:

[0008] An all-terrain vehicle, the all-terrain vehicle comprising: a frame, a body cover, a running system, a suspension system, an engine, an exhaust assembly and a continuously variable transmission mechanism, the body cover being supported by the frame; the running system being at least partially located below the frame and including rear wheels; the suspension system connecting the rear wheels to the frame; the engine being drivingly connected to the rear wheels, the engine including a cylinder and an exhaust passage, the exhaust passage being connected to the cylinder; the exhaust assembly including an exhaust pipe connected to the exhaust passage and a muffler connected to the exhaust pipe; the continuously variable transmission mechanism including a driving wheel and a driven wheel, the driving wheel being drivingly connected to the driven wheel; the driving wheel being located behind the driven wheel, defining a longitudinal central plane perpendicular to the width direction of the frame and passing through the midpoint of the width of the frame, a connecting line between the orthographic projection of the axis center of the driving wheel on the longitudinal central plane and the orthographic projection of the central axis of the driven wheel on the longitudinal central plane being a projection connecting line, the cylinder having a cylinder axis, the orthographic projection of the cylinder axis on the longitudinal central plane being a cylinder axis projection line, and an included angle between the cylinder axis projection line and the projection connecting line having an opening facing the rear of the all-terrain vehicle, the range of the included angle being from 35° to 75°.

[0009] Further, the range of the included angle is from 40° to 70°.

[0010] Further, the range of the included angle is from 45° to 65°.

[0011] Further, the orthographic projection of the opening of the exhaust passage on the horizontal plane is an exhaust projection, the orthographic projection of the axis of the rear wheel on the horizontal plane is a rear axle projection line, and the range of the minimum distance between the exhaust projection and the rear axle projection line is from 250 mm to 400 mm.

[0012] Further, the exhaust pipe extends backward along the length direction of the frame, and the exhaust pipe is substantially divided by the longitudinal central plane; the frame includes an upper main beam, the upper main beam including a left upper main beam and a right upper main beam distributed along the width direction of the frame, and when observed along the height direction of the frame, the exhaust pipe is arranged between the left upper main beam and the right upper main beam.

[0013] Further, the suspension system includes a rear swing arm and a shock absorber, the rear swing arm connecting the rear wheels to the frame, and two ends of the shock absorber being respectively connected to the rear swing arm and the frame, and when observed from the width direction of the frame, the shock absorber at least partially overlaps with the exhaust pipe.

[0014] Further, the all-terrain vehicle includes a fuel tank for supplying energy to the engine, the body cover includes a front fender, the running system further includes front wheels, defining a first plane perpendicular to the length direction of the frame and passing through the rotation axis of the front wheels and a second plane perpendicular to the height direction of the frame and passing through the rotation axis of the front wheels, the fuel tank being located behind the first plane and at least partially in front of the engine, and the fuel tank being located above the second plane and at least partially below the front fender.

[0015] Further, the minimum distance between the fuel tank and the first plane in the longitudinal direction of the frame is the first distance, the distance between the rotation axes of the front wheels and the rotation axes of the rear wheels in the longitudinal direction of the frame is the wheelbase, and the ratio range of the first distance to the wheelbase is from 0.1 to 0.16.

[0016] Further, the exhaust pipe includes a corrugated pipe and a rigid pipe. Rigid pipes are connected to both ends of the corrugated pipe, and the rigid pipes are respectively connected to the exhaust passage and the muffler; the length range of the corrugated pipe is from 100 mm to 200 mm.

[0017] Further, the engine further includes at least two juxtaposed cylinder heads and a cylinder head cover mounted on the cylinder heads. The two cylinder heads are disposed on the cylinder, and two cylinder holes are formed in the cylinder heads. In the width direction of the frame, the ratio range of the maximum width occupied by the cylinder heads to the maximum width occupied by the cylinder is from 0.63 to 0.9.

[0018] The above all-terrain vehicle can set the opening of the exhaust passage backward, so that the exhaust pipe can be directly arranged backward, which is beneficial to shortening the overall length of the exhaust pipe in the all-terrain vehicle, avoiding interference with the assembly of other components by the exhaust pipe, and improving the structural compactness at the exhaust pipe. Also, the flow path of the exhaust gas in the all-terrain vehicle can be shortened, which is beneficial to reducing the heat transfer of the exhaust gas in the all-terrain vehicle, reducing the overall heat of the all-terrain vehicle, and improving the driving comfort of the all-terrain vehicle. Description of the Drawings

[0019] Figure 1 It is a schematic structural diagram of the all-terrain vehicle provided by the embodiment of the present application.

[0020] Figure 2 It is a partial structural side view of the all-terrain vehicle provided by the embodiment of the present application.

[0021] Figure 3 It is a side view of the frame, traveling system, power assembly and exhaust assembly of the all-terrain vehicle provided by the embodiment of the present application.

[0022] Figure 4 It is a top view of the frame, traveling system, power assembly and exhaust assembly of the all-terrain vehicle provided by the embodiment of the present application.

[0023] Figure 5 It is a rear view of the power assembly of the all-terrain vehicle provided by the embodiment of the present application.

[0024] Figure 6 It is a partial structural right view of the all-terrain vehicle provided by the embodiment of the present application.

[0025] Figure 7 It is an assembly drawing of the frame and fuel assembly of the all-terrain vehicle provided by the embodiment of the present application.

[0026] Figure 8 The partial enlarged view of point A in Figure 7 the [specific figure].

[0027] Figure 9 The exploded view of the frame, fuel assembly, power assembly, seat assembly and electrical assembly of the all-terrain vehicle provided by the embodiment of the present application.

[0028] Figure 10 The top view of the frame, fuel assembly, power assembly and electrical assembly of the all-terrain vehicle provided by the embodiment of the present application.

[0029] Figure 11 The schematic diagram of the exploded structure of the engine of the all-terrain vehicle provided by the embodiment of the present application.

[0030] Figure 12 The top view of the assembly relationship of the engine, continuously variable transmission mechanism, fuel tank and air filter of the all-terrain vehicle provided by the embodiment of the present application.

[0031] Figure 13 The virtual schematic diagram of the top view of the assembly relationship of the engine, continuously variable transmission mechanism, fuel tank and air filter of the all-terrain vehicle provided by the embodiment of the present application. Detailed implementation manners

[0032] In order to enable those skilled in the art to better understand the solution of the present application, the technical solutions in the specific implementation manners of the present application will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present application.

[0033] It should be noted that the "first", "second" and similar terms used in the specification and claims of the present application do not indicate any order, quantity or importance, but are only used to distinguish different components. Similarly, terms such as "a" or "one" do not indicate a quantity limitation, but indicate the existence of at least one. Unless otherwise specified, terms such as "front", "rear", "left", "right", "lower" and / or "upper" are only for convenience of description and are not limited to one position or a spatial orientation. The terms "including" or "comprising" and similar terms mean that the elements or items appearing before "including" or "comprising" cover the elements or items listed after "including" or "comprising" and their equivalents, and do not exclude other elements or items. The singular forms of "a", "the" and "said" used in the specification and appended claims of the present application are also intended to include the plural forms unless the context clearly dictates otherwise.

[0034] Such as Figure 1 and Figure 2As shown in the figure, the present application provides an all-terrain vehicle 100, which includes a frame 11, a body cover 12, a running system 13, a suspension system 14, a powertrain 15, a transmission component 16, a fuel component 17, a seat component 19, and an electrical component 22.

[0035] To clearly illustrate the technical solution of the present application, the front, rear, left, right, up, and down as shown in Figure 1 are also defined. In the present application, the length direction of the frame 11 refers to the Figure 1 front and rear direction in Figure 1 , the width direction of the frame 11 refers to the Figure 1 left and right direction in

[0036] and the height direction of the frame 11 refers to the up and down direction in Figure 1 . A plane perpendicular to the width direction of the frame 11 and passing through the midpoint of the width of the frame 11 is defined as the longitudinal central plane 10s of the all-terrain vehicle 100.

[0036] Among them, the frame 11 serves as the basic framework of the all-terrain vehicle 100 and is used to support the body cover 12, the running system 13, the suspension system 14, the powertrain 15, the transmission component 16, the fuel component 17, the seat component 19, and the electrical component 22. At least part of the body cover 12 is located on the frame 11 and connected to the frame 11 so that the body cover 12 can protect the components inside the all-terrain vehicle 100. At least part of the running system 13 is located below the frame 11, and the suspension system 14 connects the running system 13 to the frame 11. The powertrain 15 is drivingly connected to the running system 13. Specifically, the transmission component 16 drivingly connects the powertrain 15 to the running system 13. The fuel component 17 includes a fuel tank 171, and the fuel tank 171 is used to supply energy to the powertrain 15. Specifically, the fuel tank 171 is used to deliver fuel to the powertrain 15. The electrical component 22 is supported by the frame 11, or the electrical component 22 is supported by the body cover 12 or the frame 11, and the electrical component 22 is used to display the driving data of the all-terrain vehicle 100, control the operation of the all-terrain vehicle 100, etc. The seat component 19 is supported by the frame 11, and the seat component 19 is used to support the driver and / or passengers.

[0037] As shown in Figure 3 , Figure 4 and Figure 9 , the running system 13 includes rear wheels 133, and the suspension system 14 connects the rear wheels 133 to the frame 11. The powertrain 15 is supported by the frame 11, and the powertrain 15 is drivingly connected to the rear wheels 133 to drive the rear wheels 133 to move. The all-terrain vehicle 100 further includes an exhaust component 32, and the exhaust component 32 is used to convey and discharge the exhaust gas generated by the powertrain 15.

[0038] The powertrain 15 includes an engine 151, and the engine 151 is drivingly connected to the rear wheels 133 so that the engine 151 drives the rear wheels 133 to rotate. Specifically, the engine 151 includes an exhaust passage 1515, and the exhaust passage 1515 is used to discharge the exhaust gas generated during the operation of the engine 151 and convey the exhaust gas generated by the engine 151 to the exhaust assembly 32.

[0039] More specifically, the exhaust assembly 32 includes an exhaust pipe 321 and a muffler 322. The exhaust pipe 321 is used to convey the exhaust gas, and the muffler 322 is used to reduce the noise generated when the exhaust pipe 321 conveys the exhaust gas. Among them, the exhaust pipe 321 is connected to the exhaust passage 1515, and the muffler 322 is connected to the exhaust pipe 321.

[0040] In this embodiment, the opening of the exhaust passage 1515 is arranged backward. With such an arrangement, the exhaust pipe 321 connected to the exhaust passage 1515 can be directly arranged backward, which is beneficial to shortening the overall length of the exhaust pipe 321, and thus beneficial to reducing the cost of the exhaust pipe 321. Secondly, the above arrangement is also beneficial to reducing the space occupancy rate of the exhaust pipe 321 in the all-terrain vehicle 100, so that more layout space can be provided for other components, so that the exhaust pipe 321 does not interfere with the assembly of other components, and thus is beneficial to improving the structural compactness inside the all-terrain vehicle 100.

[0041] In addition, in this application, the exhaust gas generated by the engine 151 contains a large amount of heat. Therefore, through the above arrangement, the exhaust pipe 321 can be arranged backward and the length of the exhaust pipe 321 can be shortened, which is beneficial to shortening the flow path of the exhaust gas in the all-terrain vehicle 100, and thus beneficial to reducing the heat transfer of the exhaust gas in the all-terrain vehicle 100, so as to be beneficial to reducing the overall temperature of the all-terrain vehicle 100 and improving the driving comfort of the all-terrain vehicle 100. And, in this application, the seat assembly 19 (refer to Figure 6 ) is located in front of the exhaust passage 1515. Therefore, arranging the exhaust pipe 321 backward can make the exhaust pipe 321 be arranged away from the seat assembly 19, so as to reduce the heat conducted from the exhaust gas in the exhaust pipe 321 to the seat assembly 19, and further improve the driving comfort of the all-terrain vehicle 100.

[0042] In this embodiment, the orthographic projection of the exhaust passage 1515 on the horizontal plane is the exhaust projection 1515a, and the orthographic projection of the axis of the rear wheel 133 on the horizontal plane is the rear axle projection line 133a. Among them, the range of the minimum distance D14 between the exhaust projection 1515a and the rear axle projection line 133a is 250 mm to 400 mm. Specifically, the range of the minimum distance D14 between the exhaust projection 1515a and the rear axle projection line 133a is 300 mm to 350 mm. More specifically, the minimum distance D14 between the exhaust projection 1515a and the rear axle projection line 133a is 325 mm. With such a setting, it is possible to avoid the exhaust projection 1515a and the rear axle projection line 133a having too small a minimum distance D14, which may cause the exhaust passage 1515 to be too far back, thereby avoiding the engine 151 being too far back due to the exhaust passage 1515 being too far back, so as to avoid the engine 151 interfering with the assembly of the components located at the rear of the frame 11, which is conducive to improving the working stability of the components at the rear of the frame 11. In addition, it is also possible to avoid the minimum distance D14 between the exhaust projection 1515a and the rear axle projection line 133a being too large, which may result in the need to lay a too long exhaust pipe 321, thus facilitating the shortening of the overall length of the exhaust pipe 321, so as to avoid the exhaust pipe 321 interfering with the assembly of other components, and further improving the structural compactness at the exhaust pipe 321. At the same time, it is also possible to avoid too much heat transfer of the exhaust gas in the all-terrain vehicle 100 due to the too long exhaust pipe 321, which is conducive to reducing the overall temperature of the all-terrain vehicle 100 and improving the driving comfort of the all-terrain vehicle 100.

[0043] As an embodiment, the exhaust pipe 321 extends backward along the front-rear direction of the frame 11, and the exhaust pipe 321 is divided by the longitudinal central plane 10s. With such a setting, the exhaust pipe 321 can be arranged in the middle along the width direction of the frame 11, thus avoiding the situation where the exhaust pipe 321 is biased to one side, resulting in too high a temperature at the position where the exhaust pipe 321 is located, that is, there is a gap between the exhaust pipe 321 and both sides of the all-terrain vehicle 100 along the width direction. This gap can block part of the heat dissipated by the exhaust pipe 321, which is conducive to reducing the overall heat of the all-terrain vehicle 100. In addition, the exhaust pipe 321 arranged in the middle is also conducive to shortening the layout travel of the exhaust pipe 321 in the all-terrain vehicle 100, thus facilitating the shortening of the overall length of the exhaust pipe 321.

[0044] As an alternative implementation, along the length direction of the frame 11, the length L6 of the exhaust pipe 321 ranges from 350 mm to 600 mm. Specifically, the length L6 of the exhaust pipe 321 ranges from 400 mm to 550 mm. More specifically, the length L6 of the exhaust pipe 321 ranges from 450 mm to 500 mm. With such a setting, it is possible to avoid the exhaust pipe 321 having an overly long length and interfering with the assembly of other components, thereby facilitating the improvement of the structural compactness of the exhaust pipe 321. At the same time, it is also possible to avoid the exhaust pipe 321 having an overly long length L6 and causing excessive heat conduction of the exhaust gas in the exhaust pipe 321 within the all-terrain vehicle 100, thereby facilitating the reduction of the overall temperature of the all-terrain vehicle 100 to improve the driving comfort of the all-terrain vehicle 100.

[0045] As an implementation, the frame 11 includes an upper main beam 1131, and the upper main beam 1131 includes a left upper main beam 1131a and a right upper main beam 1131b. Among them, the left upper main beam 1131a and the right upper main beam 1131b are distributed along the width direction of the frame 11. Specifically, the orthographic projection of the left upper main beam 1131a on the horizontal plane is the left upper main beam projection plane, the orthographic projection of the right upper main beam 1131b on the horizontal plane is the right upper main beam projection plane, the orthographic projection of the exhaust pipe 321 on the horizontal plane is the exhaust pipe projection plane, and the exhaust pipe projection plane is located between the left upper main beam projection plane and the right upper main beam projection plane. That is, when observing along the height direction of the frame 11, the exhaust pipe 321 is arranged between the left upper main beam 1131a and the right upper main beam 1131b. With such a setting, it is beneficial for the exhaust pipe 321 to be centered along the width direction of the frame 11, thereby facilitating the reduction of the overall heat of the all-terrain vehicle 100. Secondly, it is also possible to avoid the exhaust pipe 321 being located outside the upper main beam 1131 and interfering with the installation of components outside the frame 11. In addition, it is also avoided that the exhaust pipe 321 is located outside the upper main beam 1131 and the frame 11 cannot protect the exhaust pipe 321, thereby facilitating the improvement of the protection effect on the exhaust pipe 321 to improve the service life of the exhaust pipe 321.

[0046] As an implementation, the suspension system 14 includes a rear swing arm 145 and a shock absorber 147. The rear swing arm 145 connects the rear wheel 133 to the frame 11, and both ends of the shock absorber 147 are respectively connected to the rear swing arm 145 and the frame 11 so that the shock absorber 147 can provide buffering for the rear swing arm 145. Specifically, when observing from the width direction of the frame 11, the shock absorber 147 at least partially overlaps with the exhaust pipe 321. With such a setting, it is possible to avoid interference in the assembly of the exhaust pipe 321 and the shock absorber 147. In addition, it is possible to avoid the exhaust pipe 321 occupying the layout space above the shock absorber 147 and causing the layout space of the shock absorber 147 to be reduced, thereby facilitating the layout of a large-volume shock absorber 147 to facilitate the improvement of the shock absorption effect of the shock absorber 147, and further facilitating the improvement of the comfort of the all-terrain vehicle 100.

[0047] As an implementation manner, the exhaust pipe 321 includes a rigid pipe 3211 and a corrugated pipe 3212. Both ends of the corrugated pipe 3212 are connected to the rigid pipe 3211, and the rigid pipes 3211 are respectively connected to the exhaust passage 1515 and the muffler 322. Specifically, the two ends of the rigid pipe 3211 are respectively connected to the exhaust passage 1515 and the muffler 322. With such a setting, the flexible connection of the corrugated pipe 3212 can absorb the vibrations transmitted to the exhaust pipe 321 during the operation of the engine 151 and the driving of the all-terrain vehicle 100, thereby avoiding damage to the exhaust pipe 321 caused by strong vibrations, and further improving the service life of the exhaust pipe 321. Secondly, it is also possible to avoid using connection and sealing structures such as springs and graphite rings to connect the rigid pipes 3211 and to achieve the shock absorption function of the exhaust pipe 321, which is beneficial to simplifying the overall structure of the exhaust pipe 321, and further beneficial to simplifying the assembly process of the exhaust pipe 321 to improve the assembly efficiency of the exhaust pipe 321. In some embodiments, the corrugated pipe 3212 is welded to the rigid pipe 3211 to make the exhaust pipe 321 an integral structure, which is beneficial to improving the sealing performance of the exhaust pipe 321. And through the above setting, it is also beneficial to simplify the sealing structure of the exhaust pipe 321, thereby avoiding leakage of the exhaust pipe 321 at the connection of the rigid pipes 3211 to further improve the sealing performance of the exhaust pipe 321. In addition, due to the flexible characteristics of the corrugated pipe 3212, when the exhaust pipe 321 is working, it is beneficial for the exhaust pipe 321 to adjust the angle, and further beneficial to improving the shock absorption effect of the exhaust pipe 321.

[0048] In this implementation manner, the length L7 of the corrugated pipe 3212 ranges from 100 mm to 200 mm. Specifically, the length L7 of the corrugated pipe 3212 ranges from 120 mm to 180 mm. More specifically, the length L7 of the corrugated pipe 3212 ranges from 140 mm to 160 mm. With such a setting, it is possible to avoid the rigid strength of the exhaust pipe 321 being too low due to the overly long length L7 of the corrugated pipe 3212, thereby avoiding the excessive shaking amplitude of the exhaust pipe 321 after being vibrated due to the too low rigid strength of the exhaust pipe 321, and further avoiding damage to the exhaust pipe 321 caused by excessive shaking of the exhaust pipe 321 and collision with other components, which is beneficial to improving the service life of the exhaust pipe 321. In addition, it is also possible to avoid insufficient shock absorption effect of the corrugated pipe 3212 due to the overly short length L7 of the corrugated pipe 3212, which is beneficial to improving the overall shock absorption effect of the exhaust pipe 321.

[0049] It should be noted that the corrugated pipe 3212 extends along a preset straight line 10t direction in the natural state, so as to prevent the corrugated pipe 3212 from being deflected and deformed in the natural state, which may reduce the deformation characteristics of the corrugated pipe 3212, and further prevent the effect of the corrugated pipe 3212 from absorbing the vibration of the exhaust pipe 321, so as to be conducive to improving the shock absorption effect of the corrugated pipe 3212.

[0050] As an implementation manner, the engine 151 includes a cylinder 1513 and a cylinder head 1514, and the cylinder head 1514 is connected to the cylinder 1513. The engine 151 further includes a cylinder head cover 1512, and the cylinder head cover 1512 covers the cylinder head 1514. Specifically, the cylinder head 1514 is provided with two cylinder holes (not shown in the figure), that is, the engine 151 is a twin-cylinder engine. With such a setting, the twin-cylinder engine can improve the output power of the engine 151, which is conducive to improving the controllability of the all-terrain vehicle 100.

[0051] As Figure 5 shown, along the width direction of the frame 11, the ratio range of the maximum width W4 occupied by the cylinder head 1514 to the maximum width W5 occupied by the cylinder 1513 is from 0.63 to 0.9. Specifically, the ratio range of the maximum width W4 occupied by the cylinder head 1514 to the maximum width W5 occupied by the cylinder 1513 is from 0.71 to 0.87. More specifically, the ratio of the maximum width W4 occupied by the cylinder head 1514 to the maximum width W5 occupied by the cylinder 1513 is 0.79. With such a setting, it is possible to prevent the ratio of the maximum width W4 occupied by the cylinder head 1514 to the maximum width W5 occupied by the cylinder 1513 from being too large, which may lead to an oversize cylinder head 1514, thereby preventing the oversize cylinder head 1514 from interfering with the assembly of other components, and being conducive to improving the structural compactness at the engine 151. In addition, it is also possible to prevent the ratio of the maximum width W4 occupied by the cylinder head 1514 to the maximum width occupied by the cylinder 1513 from being too small, which may lead to an undersize cylinder head 1514, thereby preventing the reduction of the layout space in the cylinder head 1514, resulting in the two cylinder holes being too close or the two cylinder holes being too small, and further being conducive to improving the output power of the engine 151 and enabling the engine 151 to operate normally.

[0052] As an alternative implementation, the cylinder 1513 has a cylinder axis 10m. The orthographic projection of the cylinder axis 10m on the longitudinal central plane 10s is the cylinder axis projection line. The angle κ formed by the cylinder axis projection line and the horizontal plane ranges from 50° to 60°. Specifically, the acute angle κ formed by the cylinder axis projection line and the horizontal plane ranges from 52° to 58°. More specifically, the acute angle κ formed by the cylinder axis projection line and the horizontal plane ranges from 54° to 56°. In this embodiment, the opening of the acute angle κ is set backward. Through the above settings, it is beneficial for the exhaust pipe 321 to be directly arranged backward, thus facilitating the shortening of the overall length of the exhaust pipe 321. Also, through the above settings, it is possible to avoid an excessive acute angle κ formed by the cylinder axis projection line and the horizontal plane, which would increase the length of the exhaust pipe 321, thereby facilitating the shortening of the overall length of the exhaust pipe 321. In addition, it is also possible to avoid an overly small acute angle κ formed by the cylinder axis projection line and the horizontal plane, which would cause the cylinder head 1514 to be overly backward, thus preventing the cylinder head 1514 from interfering with the assembly of other components due to being overly backward.

[0053] As Figure 6 As shown, as an embodiment, the body covering 12 includes a front fender 126, and the front fender 126 is used to block mud and moisture. The running gear 13 includes a front wheel 132, and the front wheel 132 is used to drive the all-terrain vehicle 100 to travel and steer. The front fender 126 is at least partially located above the front wheel 132. Moreover, the all-terrain vehicle 100 further includes a suspension system 14, and the suspension system 14 connects the front wheel 132 to the frame 11. The power assembly 15 includes an engine 151, and the engine 151 is at least partially disposed on the frame 11 and is in transmission connection with the front wheel 132, so that the engine 151 can provide power for the front wheel 132 to drive the engine 151 to rotate.

[0054] Specifically, the all-terrain vehicle 100 further includes a fuel assembly 17 supported by the vehicle frame 11. The fuel assembly 17 includes a fuel tank 171 for supplying energy to the engine 151. More specifically, a first plane 10j perpendicular to the length direction of the vehicle frame 11 and passing through the rotation axis of the front wheel 132 and a second plane 10k perpendicular to the height direction of the vehicle frame 11 and passing through the rotation axis of the front wheel 132 are defined. The fuel tank 171 is located behind the first plane 10j and at least partially in front of the engine 151. The fuel tank 171 is located above the second plane 10k and at least partially below the front fender 126. With such an arrangement, the fuel tank 171 can be located at the front part of the vehicle frame 11, so that the fuel tank 171 can be distributed along the length direction of the vehicle frame 11 with the engine 151, that is, the fuel tank 171 can be located in front of the engine 151 to balance the weight of the engine 151, which is conducive to improving the body stability of the all-terrain vehicle 100. At the same time, since the fuel tank 171 is in front of the engine 151, the center of gravity height of the fuel tank 171 can be reduced, that is, the center of gravity of the fuel tank 171 can be closer to the second plane 10k, thereby reducing the center of gravity height of the all-terrain vehicle 100 and further improving the driving stability of the all-terrain vehicle 100. Moreover, the fuel tank 171 being located behind the first plane 10j can avoid the installation of the fuel tank 171 interfering with the components at the front part of the vehicle frame 11, which is conducive to improving the working stability of the fuel tank 171 and the components at the front part of the vehicle frame 11; and the fuel tank 171 being located above the second plane 10k can avoid the fuel tank 171 interfering with the vehicle frame 11, the front wheel 132, and the suspension system 14, which is conducive to the stable operation of the fuel tank 171, the front wheel 132, and the suspension system 14.

[0055] In addition, through the above arrangement, the fuel tank 171 can be arranged in front of the engine 151, so as to provide a layout space behind the engine 151 to avoid the exhaust pipe 321 (refer to Figure 3 ) having to avoid the fuel tank 171 when being laid out at the rear part of the vehicle frame 11. Furthermore, it is conducive to the exhaust pipe 321 being directly laid backward behind the engine 151, which is conducive to shortening the length of the exhaust pipe 321.

[0056] As an implementation manner, the walking system 13 includes a rear wheel 133, and the rear wheel 133 is in transmission connection with the engine 151 so that the engine 151 can provide power for the rear wheel 133. Wherein, the minimum distance between the fuel tank 171 and the first plane 10j in the length direction of the vehicle frame 11 is the first distance D9, the distance between the rotation axis of the front wheel 132 and the rotation axis of the rear wheel 133 in the length direction of the vehicle frame 11 is the wheelbase D10, and the ratio range of the first distance D9 to the wheelbase D10 is 0.1 to 0.16. Specifically, the ratio range of the first distance D9 to the wheelbase D10 is 0.11 to 0.14. More specifically, the ratio of the first distance D9 to the wheelbase D10 is 0.13. With such a setting, it is possible to avoid the ratio of the first distance D9 to the wheelbase D10 being too large, resulting in the fuel tank 171 being too far back, thereby avoiding the fuel tank 171 being unable to balance the weight of the engine 151, which is conducive to improving the body stability of the all-terrain vehicle 100; at the same time, it can also avoid the installation position of the fuel tank 171 being too far back, resulting in the fuel tank 171 interfering with the installation of other components, which is conducive to improving the overall assembly coordination of the all-terrain vehicle 100, and further improving the overall structural compactness of the all-terrain vehicle 100. Secondly, it is also possible to avoid the ratio of the first distance D9 to the wheelbase D10 being too small, resulting in the fuel tank 171 being too far forward, thereby avoiding the installation of the fuel tank 171 interfering with the components in the front part of the vehicle frame 11, so as to improve the working stability of the all-terrain vehicle 100.

[0057] In addition, through the above setting, it is possible to avoid the ratio of the first distance D9 to the wheelbase D10 being too large, resulting in the fuel tank 171 being set too far back, thereby causing the engine 151 to also be set too far back, so as to avoid the engine 151 being too far back and interfering with the installation of the components in the rear part of the vehicle frame 11, which is conducive to improving the assembly coordination of the components in the rear part of the vehicle frame 11 and improving the structural compactness of the rear part of the vehicle frame 11. And, it is also possible to avoid the ratio of the first distance D9 to the wheelbase D10 being too small, resulting in the fuel tank 171 being set too far forward, thereby avoiding the engine 151 being set too far forward and causing the length of the exhaust pipe 321 to be too long, so as to avoid the too long exhaust pipe 321 interfering with the assembly of other components, which is conducive to improving the assembly coordination of the components at the exhaust pipe 321. And, it is also possible to avoid the length of the exhaust pipe 321 being too long, resulting in too much heat conducted by the exhaust gas in the exhaust pipe 321 in the all-terrain vehicle 100, which is conducive to reducing the overall temperature of the all-terrain vehicle 100 and improving the driving comfort of the all-terrain vehicle 100. At the same time, it is also possible to avoid the fuel tank 171 being too far forward and interfering with the components in the front part of the vehicle frame 11, which is conducive to the assembly coordination of the front part of the vehicle frame 11.

[0058] As an implementation manner, the acute angle κ formed by the cylinder axis 10m and the second plane 10k is arranged with the opening facing backward. With such an arrangement, along the length direction of the vehicle frame 11, the cylinder head 1514 can be arranged backward, so that the whole engine 151 can be arranged at the rear, and thus a layout space can be reserved for the fuel tank 171 in front of the engine 151, which is beneficial to the assembly of the fuel tank 171. In addition, through the above arrangement, the fuel tank 171 and the engine 151 can be distributed along the length direction of the vehicle frame 11, so that the fuel tank 171 can balance the weight of the engine 151, which is beneficial to improving the overall stability of the all-terrain vehicle 100.

[0059] As an implementation manner, the minimum distance between the rotation axis of the engine 151 and the rear wheel 133 along the length direction of the vehicle frame 11 is the rearward distance D11, and the ratio range of the first distance D9 to the rearward distance D11 is 0.11 to 0.17. Specifically, the ratio range of the first distance D9 to the rearward distance D11 is 0.13 to 0.16. More specifically, the ratio of the first distance D9 to the rearward distance D11 is 0.14. With such an arrangement, it can be avoided that the ratio of the first distance D9 to the rearward distance D11 is too large, resulting in the fuel tank 171 and the engine 151 being arranged too far back, thereby avoiding the overall center of gravity of the all-terrain vehicle 100 being too far back, which is beneficial to improving the vehicle body stability of the all-terrain vehicle 100. At the same time, it can also be avoided that the fuel tank 171 and the engine 151 are too far back, resulting in interference with the installation of other components, which is beneficial to improving the overall assembly coordination of the all-terrain vehicle 100. Secondly, it can also be avoided that the ratio of the first distance D9 to the rearward distance D11 is too small, resulting in the fuel tank 171 and the engine 151 being arranged too far forward, thereby avoiding the overall center of gravity of the all-terrain vehicle 100 being too far forward, so as to further improve the vehicle body stability of the all-terrain vehicle 100. And it can also be avoided that the fuel tank 171 and the engine 151 are too far forward, resulting in interference with the components in the front part of the vehicle frame 11, which is beneficial to improving the working stability of the all-terrain vehicle 100.

[0060] As an implementation manner, the minimum distance between the fuel tank 171 and the second plane 10k in the height direction of the vehicle frame 11 is the second distance D12, and the ratio range of the second distance D12 to the wheelbase D10 is from 0.09 to 0.15. Specifically, the ratio range of the second distance D12 to the wheelbase D10 is from 0.11 to 0.14. More specifically, the ratio of the second distance D12 to the wheelbase D10 is 0.12. With such a setting, it is possible to avoid the installation position of the fuel tank 171 being too high due to the ratio of the second distance D12 to the wheelbase D10 being too large, thereby avoiding the center of gravity of the fuel tank 171 being too high, and further being beneficial to reducing the overall center of gravity position of the all-terrain vehicle 100 to improve the vehicle body stability of the all-terrain vehicle 100. Secondly, it is also possible to avoid the installation position of the fuel tank 171 being too low due to the ratio of the second distance D12 to the wheelbase D10 being too small, thereby avoiding the fuel tank 171 interfering with the installation of other components at the bottom of the all-terrain vehicle 100, and further being beneficial to improving the overall assembly coordination of the all-terrain vehicle 100 to improve the overall structural compactness of the all-terrain vehicle 100.

[0061] As an implementation manner, the suspension system 14 includes a front shock absorber 142 and a front swing arm (not shown in the figure). The front swing arm connects the front wheel 132 to the vehicle frame 11, and the front shock absorber 142 is rotatably connected to the front swing arm and the vehicle frame 11 so that the front shock absorber 142 can provide buffering between the vehicle frame 11 and the front swing arm. The fuel tank 171 is at least partially located behind the front shock absorber 142. With such a setting, it is possible to avoid the fuel tank 171 interfering with the installation of the front shock absorber 142, thereby being beneficial to improving the assembly coordination between the fuel tank 171 and the front shock absorber 142 to improve the structural compactness at the fuel tank 171.

[0062] As an implementation manner, the all-terrain vehicle 100 includes a seat assembly 19 for the driver and passengers to sit on, and the seat assembly 19 is supported by the vehicle frame 11. The body covering 12 further includes a storage box assembly 1205 for storing items, and the storage box assembly 1205 is supported by the vehicle frame 11. Specifically, along the length direction of the vehicle frame 11, the storage box assembly 1205 is at least partially located between the front fender 126 and the seat assembly 19, and the fuel tank 171 is at least partially located below the storage box assembly 1205. In this application, since the fuel tank 171 can utilize the space in front of the engine 151, the overall height of the fuel tank 171 is lowered, so that a layout space can be reserved above the fuel tank 171, which is further beneficial to arranging a storage box assembly 1205 with a larger volume in the above layout space to improve the storage function of the storage box assembly 1205. In addition, without increasing the overall volume of the all-terrain vehicle 100, by reserving a layout space above the fuel tank 171, it is beneficial for other components to utilize the above layout space for layout, thereby being beneficial to improving the space utilization rate of the all-terrain vehicle 100.

[0063] As an implementation manner, the fuel assembly 17 includes a fuel filler 172 which is communicated with a fuel tank 171, so that the fuel tank 171 can be charged through the fuel filler 172. Wherein, the fuel filler 172 is located on the front fender 126. In some embodiments, through holes are provided on the front fender 126, and the fuel filler 172 is disposed through the through holes. In the present application, at least a part of the fuel tank 171 is located below the front fender 126. Therefore, arranging the fuel filler 172 on the front fender 126 can reduce the distance between the fuel filler 172 and the fuel tank 171, which is beneficial to the fuel filler 172 charging the fuel tank 171; and the above arrangement can also simplify the installation structure of the fuel filler 172 on the all-terrain vehicle 100. In some embodiments, the fuel assembly 17 further includes a fuel filler cap which is configured to be able to cover the fuel filler 172, thereby improving the sealing performance of the fuel filler 172.

[0064] As an alternative implementation manner, the fuel filler 172 extends substantially along the direction of a preset straight line 10n. The positive projection of the preset straight line 10n on the longitudinal central plane 10s is a first projection line, and the positive projection of the second plane 10k on the longitudinal central plane 10s is an axis horizontal line. The angle range of the included angle θ formed by the first projection line and the axis horizontal line is from 20° to 90°. Specifically, the opening of the included angle is arranged backward. More specifically, the angle range of the included angle θ formed by the first projection line and the axis horizontal line is from 40° to 70°. Such an arrangement can avoid the included angle θ formed by the first projection line and the axis horizontal line being too small, which may cause the fuel filler 172 to be overly inclined, thereby avoiding the reduction of the smoothness of refueling at the fuel filler 172, and further being beneficial to improving the refueling efficiency of the fuel filler 172. In addition, it can also avoid the included angle θ formed by the first projection line and the axis horizontal line being too large, which may cause the opening of the included angle to be arranged forward. Thus, when refueling the fuel filler 172 with a fuel gun, it can avoid interference between the fuel gun and the components (such as the front shelf on the front fender 126) arranged in front of the all-terrain vehicle 100, and further be beneficial to improving the convenience of refueling at the fuel filler 172.

[0065] In addition, through the above arrangement, the fuel filler 172 can be adapted to the upper surfaces of different front fenders 126, which is beneficial to improving the assembly coordination between the fuel filler 172 and the front fender 126, and further improving the versatility of the fuel filler 172.

[0066] Such as Figure 7 and Figure 8As shown, as an implementation manner, a first fixing portion 1711, a second fixing portion 1712, and a plugging portion 1713 are provided on the fuel tank 171. Specifically, the frame 11 includes a first pipe fitting 11d in front of the fuel tank 171, a second pipe fitting 11e behind the fuel tank 171, and a support cross beam 11f below the fuel tank 171. Among them, the first fixing portion 1711 is fixedly connected to the first pipe fitting 11d, and the second fixing portion 1712 is fixedly connected to the second pipe fitting 11e. In some embodiments, the first pipe fitting 11d and the second pipe fitting 11e are distributed on both sides of the fuel tank 171 along the length direction of the frame 11, so that both sides of the fuel tank 171 can be fixed through the first fixing portion 1711 and the second fixing portion 1712, which is conducive to improving the stability of the fuel tank 171.

[0067] In this implementation manner, the plugging portion 1713 is plugged into the support cross beam 11f. In some embodiments, a plugging port 11fa is provided on the support cross beam 11f, and the plugging port 11fa is configured to be able to be plugged with the plugging portion 1713. With such a setting, through the plugging of the plugging portion 1713 and the support cross beam 11f, the installation position of the fuel tank 171 can be limited, which is conducive to simplifying the assembly process of the fuel tank 171 to improve the assembly efficiency of the fuel tank 171. In addition, through the above setting, the connection stability between the fuel tank 171 and the frame 11 can be further improved.

[0068] More specifically, the first fixing portion 1711 is arranged closer to the fuel filling port 172 than the second fixing portion 1712. With such a setting, the fuel tank 171 can be fixed first through the first fixing portion 1711, so that the fixing point near the fuel filling port 172 is fixed first, which is conducive to improving the stability of the fuel filling port 172 through the first fixing portion 1711 and is conducive to the installation of the fuel filling port 172 and the front fender 126.

[0069] In some embodiments, a protective pad 11fb is provided on the side of the support cross beam 11f close to the fuel tank 171, and the protective pad 11fb is configured to provide flexible buffering for the fuel tank 171 and the support cross beam 11f. With such a setting, it can be avoided that the fuel tank 171 is in direct rigid contact with the support cross beam 11f, resulting in wear of the fuel tank 171, which is conducive to improving the service life of the fuel tank 171. In some embodiments, the protective pad 11fb can be a rubber pad.

[0070] As Figures 9 to 13As shown, as an implementation, the electrical component 22 includes an electronic control unit 22a (Electronic Control Unit, ECU). The electronic control unit 22a is supported by the vehicle frame 11 and is used to control the power output of the powertrain 15. The seat assembly 19 includes a seat cushion 191, and the seat cushion 191 is detachably connected to the vehicle frame 11. In this application, the seat cushion 191 is located above the powertrain 15, the electronic control unit 22a is located between the seat cushion 191 and the powertrain 15, and when viewed from the height direction of the vehicle frame 11, the seat cushion 191 and the electronic control unit 22a at least partially overlap. Among them, since the seat cushion 191 and the vehicle frame 11

[0071] are detachably connected, through the above settings, when the seat cushion 191 and the vehicle frame 11 are in a disassembled state, the maintainability of the electronic control unit 22a can be improved. In addition, the above settings also make the electronic control unit 22a located at the middle position in the length direction of the vehicle frame 11, so that the wiring harness arrangement between the electronic control unit 22a and the electrical components located on the front and rear sides of the all-terrain vehicle 100 is more convenient, and thus the all-terrain vehicle 100 does not require an overly long wiring harness to improve the simplicity of the wiring harness.

[0072] As Figures 9 to 13 shown, the powertrain 15 includes an engine 151, a continuously variable transmission mechanism 152, and an air filter 154. The continuously variable transmission mechanism 152 and the engine 151 are distributed along the width direction of the vehicle frame 11, and the continuously variable transmission mechanism 152 is drivingly connected to the engine 151. The air filter 154 is connected to the engine 151 so that the air filter 154 can supply air to the engine 151. Along the height direction of the vehicle frame 11, the air filter 154 is at least partially located between the powertrain 15 and the seat assembly 19, and the electronic control unit 22a is located above the air filter 154. Along the length direction of the vehicle frame 11, the air filter 154 is at least partially located between the fuel tank 171 and the engine 151 (see Figure 2 ). When viewed from the height direction of the vehicle frame 11, the air filter 154 at least partially overlaps with the storage box assembly 1205.

[0073] More specifically, the engine 151 includes a cylinder 1513 and a cylinder head 1514, and the cylinder head 1514 is connected to the cylinder 1513. Among them, the cylinder head 1514 is located at the rear of the cylinder 1513. The continuously variable transmission mechanism 152 includes a driving pulley 1521 and a driven pulley 1522, and the driving pulley 1521 is in transmission connection with the driven pulley 1522. At least part of the air filter 154 can be located above the driven pulley 1522, and the air filter 154 is located in front of the cylinder head 1514. When observing in the height direction of the vehicle frame 111, at least part of the air filter 154 overlaps with the driven pulley 1522, and the air filter 154 does not overlap with the engine 151. When observing in the length direction of the vehicle frame 111, at least part of the air filter 154 overlaps with the engine 151, and at least part of the air filter 154 overlaps with the fuel tank 171. Through the above arrangement, the structure of the engine 151 and the air filter 154 can be made more compact. At the same time, the layout space in front of the cylinder head 1514 can also provide a gap between the air filter 154 and the electronic control unit 22a, so that the work between the air filter 154 and the electronic control unit 22a does not interfere with each other, thereby improving the working stability of the air filter 154 and the electronic control unit 22a. That is, the cylinder head 1514 is arranged obliquely backward relative to the cylinder 1513, so as to increase the layout space in the front of the cylinder 1513, which is beneficial to the layout of the air filter 154.

[0074] The electronic control unit 22a is at least partially located above the engine 151 and at least partially located above the continuously variable transmission mechanism 152. The rearmost end of the continuously variable transmission mechanism 152 is located in front of the rearmost end of the exhaust passage 1515.

[0075] As an alternative implementation, the connection line between the orthographic projection of the central axis of the driving wheel 1521 on the longitudinal central plane 10s and the orthographic projection of the central axis of the driven wheel 1522 on the longitudinal central plane 10s is the projection connection line 152a. The cylinder 1513 extends in the direction of the cylinder axis 10m, and the orthographic projection of the cylinder axis 10m on the longitudinal central plane 10s is the cylinder axis projection line. The opening of the included angle β formed by the cylinder axis projection line and the projection connection line 152a is arranged towards the rear of the all-terrain vehicle 100, and the angle range of the included angle β is 35° to 75°. Specifically, the angle range of the included angle β formed by the cylinder axis projection line and the projection connection line 152a is 40° to 70°. More specifically, the angle range of the included angle β formed by the cylinder axis projection line and the projection connection line 152a is 45° to 65°. For example, in this embodiment, the included angle β formed by the cylinder axis projection line and the projection connection line 152a is 64.7°. Through the above settings, it is beneficial for the exhaust pipe 321 to be directly arranged towards the rear, thereby facilitating the shortening of the overall length of the exhaust pipe 321. Moreover, through the above settings, it is also possible to avoid increasing the length of the exhaust pipe 321 due to the included angle β formed by the cylinder axis projection line and the projection connection line 152a being too large, which is conducive to shortening the overall length of the exhaust pipe 321. In addition, it is also possible to avoid the cylinder head 1514 being too far back due to the included angle β formed by the cylinder axis projection line and the projection connection line 152a being too small, thereby avoiding the cylinder head 1514 interfering with the assembly of other components due to being too far back.

[0076] It should be understood that for those of ordinary skill in the art, improvements or transformations can be made according to the above description, and all such improvements and transformations shall fall within the protection scope of the appended claims of this application.

Claims

1. An all-terrain vehicle, comprising: a frame; a body cover, which is supported by the frame; a running system, at least part of which is located below the frame and includes rear wheels; a suspension system, which connects the rear wheels to the frame; an engine, which is in transmission connection with the rear wheels, the engine includes a cylinder and an exhaust passage, and the exhaust passage is connected to the cylinder; an exhaust assembly, which includes an exhaust pipe connected to the exhaust passage and a muffler connected to the exhaust pipe; a continuously variable transmission mechanism, which includes a driving wheel and a driven wheel, and the driving wheel is in transmission connection with the driven wheel; characterized in that the driving wheel is located behind the driven wheel. Define a longitudinal central plane perpendicular to the width direction of the frame and passing through the midpoint of the frame width. The connection line of the positive projection of the central axis of the driving wheel on the longitudinal central plane and the positive projection of the central axis of the driven wheel on the longitudinal central plane is the projection connection line. The cylinder has a cylinder axis, and the positive projection of the cylinder axis on the longitudinal central plane is the cylinder axis projection line. The included angle between the cylinder axis projection line and the projection connection line opens towards the rear of the all-terrain vehicle, and the range of the included angle is 35° to 75°.

2. The all-terrain vehicle according to claim 1, characterized in that the range of the included angle is 40° to 70°.

3. The all-terrain vehicle according to claim 2, characterized in that the range of the included angle is 45° to 65°.

4. The all-terrain vehicle according to claim 1, characterized in that the opening of the exhaust passage faces the rear of the all-terrain vehicle. The rearmost end of the continuously variable transmission mechanism is located in front of the rearmost end of the exhaust passage. The positive projection of the opening of the exhaust passage on the horizontal plane is the opening projection, and the positive projection of the rear wheel axis on the horizontal plane is the rear wheel axis projection. The range of the minimum distance between the opening projection and the rear wheel axis projection is 250 mm to 400 mm.

5. The all-terrain vehicle according to claim 1, characterized in that the exhaust pipe extends backward along the length direction of the frame, and the exhaust pipe is basically divided by the longitudinal central plane; the frame includes an upper main beam, and the upper main beam includes a left upper main beam and a right upper main beam distributed along the width direction of the frame. When observed along the height direction of the frame, the exhaust pipe is arranged between the left upper main beam and the right upper main beam.

6. The all-terrain vehicle according to claim 1, characterized in that the suspension system includes a rear swing arm and a shock absorber. The rear swing arm connects the rear wheels to the frame, and both ends of the shock absorber are respectively connected to the rear swing arm and the frame. When observed from the width direction of the frame, the shock absorber at least partially overlaps with the exhaust pipe.

7. The all-terrain vehicle according to claim 1, characterized in that The all-terrain vehicle includes a fuel tank for supplying energy to the engine. The body covering includes a front fender. The running system further includes a front wheel. A first plane is defined that is perpendicular to the length direction of the frame and passes through the rotation center axis of the front wheel. A second plane is defined that is perpendicular to the height direction of the frame and passes through the rotation center axis of the front wheel. The fuel tank is located behind the first plane and at least partially in front of the engine. The fuel tank is located above the second plane and at least partially below the front fender.

8. The all-terrain vehicle according to claim 7, wherein the minimum distance between the fuel tank and the first plane in the length direction of the frame is a first distance, the distance between the rotation center axis of the front wheel and the rotation center axis of the rear wheel in the length direction of the frame is the wheelbase, and the ratio range of the first distance to the wheelbase is from 0.1 to 0.

16.

9. The all-terrain vehicle according to claim 1, wherein the exhaust pipe includes a corrugated pipe and a rigid pipe. Both ends of the corrugated pipe are connected to the rigid pipe, and the rigid pipes are respectively connected to the exhaust passage and the muffler; the length range of the corrugated pipe is from 100 mm to 200 mm.

10. The all-terrain vehicle according to claim 1, wherein the engine further includes at least two cylinder heads arranged side by side and a cylinder head cover mounted on the cylinder heads. The two cylinder heads are provided on the cylinder block, and the cylinder heads are provided with two cylinder holes; in the width direction of the frame, the ratio range of the maximum width occupied by the cylinder heads to the maximum width occupied by the cylinder block is from 0.63 to 0.9.

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