All-terrain vehicle

Abstract

The invention discloses an all-terrain vehicle. The all-terrain vehicle comprises a vehicle body covering part; a suspension system; a walking system; the engine is used for driving the walking system; the driving wheel is in transmission connection with the driven wheel; the engine comprises an air cylinder and an exhaust passage which are connected. The exhaust pipe is connected with the silencer; an opening of the exhaust passage faces the rear of the all-terrain vehicle, and the rearmost end of the stepless speed change mechanism is located in front of the rearmost end of the exhaust passage; the driving wheel is located behind the driven wheel, the connecting line of the orthographic projection of the central axis 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 is a projection connecting line, the air cylinder is provided with an air cylinder axis, and the orthographic projection of the air cylinder axis on the longitudinal central plane is an air cylinder axis projection. An opening of an included angle between the axis projection of the air cylinder and the projection connecting line faces the rear portion of the all-terrain vehicle, and the included angle ranges from 35 degrees to 75 degrees. By means of the arrangement, the all-terrain vehicle is good in heat dissipation effect and good in driving experience.

Description

Technical Field

[0001] The present application relates to a vehicle, and more particularly to an all-terrain vehicle. Background Art

[0002] With the rapid development of vehicle technology, all-terrain vehicles are becoming increasingly popular among consumers. All-terrain vehicles generally include cross-riding off-road motorcycles, snow removal vehicles, snowmobiles, golf carts, etc., and the areas where they travel include wild fields such as deserts, jungles, tidal flats, riverbeds, and wastelands. Based on the complex terrain environment in the wild, all-terrain vehicles require strong power output during driving. This power demand directly leads to an increase in the number of cylinders, an increase in output power, and an increase in heat generation of all-terrain vehicles.

[0003] Moreover, in the prior art, the cylinder head of the engine is arranged facing the rear, so that the temperature of the part on the vehicle close to the driver's body, especially the position close to the legs, will be relatively high when straddling the vehicle, thus reducing the driving experience of the driver. Summary of the Invention

[0004] In order to solve the deficiencies of the prior art, the purpose of the present application is to provide an all-terrain vehicle with good heat dissipation effect and good driving experience.

[0005] In order to achieve the above objectives, the present invention adopts the following technical solutions:

[0006] An all-terrain vehicle, which includes a frame, a body cover, a running system, a suspension system, an engine, an exhaust assembly, and a continuously variable transmission mechanism. The frame includes an upper main beam, a lower main beam, and longitudinal beams connecting the upper main beam and the lower main beam; the body cover is supported by at least one of the upper main beam, the lower main beam, and the longitudinal beams; the running system is at least partially located below the frame and includes a left front wheel, a right front wheel, and a rear wheel; the suspension system is supported by the lower main beam; the engine is drivingly connected to the rear wheel, the engine includes a cylinder and an exhaust passage, and the exhaust passage is connected to the cylinder; the exhaust assembly includes an exhaust pipe connected to the exhaust passage and a muffler connected to the exhaust pipe; the continuously variable transmission mechanism includes a driving wheel and a driven wheel, and the driving wheel is drivingly connected to the driven wheel; a plane perpendicular to the width direction of the frame and passing through the midpoint of the width of the frame is defined as the longitudinal center plane. The opening of the exhaust passage faces the rear of the all-terrain vehicle, and the rearmost end of the continuously variable transmission mechanism is located in front of the rearmost end of the exhaust passage; the driving wheel is located behind the driven wheel, and the connection line of the orthographic projection of the central axis of the driving wheel on the longitudinal center plane and the orthographic projection of the central axis of the driven wheel on the longitudinal center plane is the projection connection line. The cylinder has a cylinder axis, and the orthographic projection of the cylinder axis on the longitudinal center plane is the cylinder axis projection. The included angle between the cylinder axis projection 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°.

[0007] Further, the range of the included angle is 40° to 70°.

[0008] Further, the included angle ranges from 45° to 65°.

[0009] Further, a reference plane perpendicular to the height direction of the vehicle frame is defined. The angle range formed by the projection of the cylinder axis and the reference plane is from 45° to 65°, and the opening of the included angle is set towards the rear of the all-terrain vehicle.

[0010] Further, the angle range formed by the projection of the cylinder axis and the reference plane is from 50° to 60°.

[0011] Further, the engine further includes two cylinder heads arranged side by side on the cylinder and a cylinder head cover installed on the cylinder head. A plane perpendicular to the height direction of the vehicle frame and passing through at least one contact point of the running gear with the horizontal plane is defined as the reference plane. The orthographic projection of the cylinder head cover on the reference plane is defined as the cylinder head cover projection area; the area formed by the orthographic projection of the upper main beam along the height direction of the vehicle frame on the reference plane is defined as the upper main beam projection closed area; the part of the cylinder head cover projection area that falls into the upper main beam projection closed area is defined as the closed area projection, and the ratio of the area of the closed area projection to the area of the cylinder head cover projection ranges from 0.6 to 0.9.

[0012] Further, along the height direction of the vehicle frame, the distance range between the uppermost end of the cylinder head cover and the lowermost end of the upper main beam is from 10 mm to 50 mm.

[0013] Further, the ratio of the area of the closed area projection to the area of the cylinder head cover projection ranges from 0.7 to 0.85.

[0014] Further, the all-terrain vehicle further includes a footrest assembly. The footrest assembly includes a left footrest serration and a right footrest serration; the all-terrain vehicle includes a magneto and a driving wheel. The magneto is arranged on one side of the all-terrain vehicle, and the driving wheel is arranged on the other side of the all-terrain vehicle; a plane perpendicular to the height direction of the vehicle frame and passing through at least one contact point of the running gear with the horizontal plane is defined as the reference plane; the orthographic projection of the left footrest serration on the reference plane is the left footrest serration projection, and the orthographic projection of the right footrest serration on the reference plane is the right footrest serration projection. Along the length direction of the vehicle frame, the distance range between the rightmost side of the left footrest serration projection and the rotation center of the driving wheel is from 0 to 420 mm; the distance range between the leftmost side of the right footrest serration projection and the rotation center of the magneto is from 0 mm to 420 mm.

[0015] Further, along the length direction of the vehicle frame, the distance range between the rightmost side of the left footrest serration projection and the rotation center of the driving wheel is from 40 mm to 380 mm; the distance range between the leftmost side of the right footrest serration and the rotation center of the magneto is from 40 mm to 380 mm.

[0016] In the above settings, the engine of the all-terrain vehicle includes a cylinder and an exhaust passage, and the exhaust passage is connected to the cylinder; the exhaust pipe is connected to the muffler; the opening of the exhaust passage faces the rear of the all-terrain vehicle, and the rearmost end of the continuously variable transmission mechanism is located in front of the rearmost end of the exhaust passage; the driving wheel is located behind the driven wheel, and the connecting line of the orthographic projection of the central axis 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 is the projection connecting line. The cylinder has a cylinder axis, and the orthographic projection of the cylinder axis on the longitudinal central plane is the cylinder axis projection. The included angle between the cylinder axis projection and the projection connecting line opens towards the rear of the all-terrain vehicle, and the range of the included angle is from 35° to 75°. By reasonably arranging the position of the engine, an all-terrain vehicle with good heat dissipation effect and good riding experience is provided. Description of the Drawings

[0017] Figure 1 is a three-dimensional schematic diagram of the all-terrain vehicle provided by an embodiment of the present application;

[0018] Figure 2 is a top view of the internal structure of the all-terrain vehicle provided by an embodiment of the present application;

[0019] Figure 3 is a left view of the internal structure of the all-terrain vehicle provided by an embodiment of the present application;

[0020] Figure 4 is an exploded view of the engine of the all-terrain vehicle provided by an embodiment of the present application;

[0021] Figure 5 is a top view of the assembly of the upper main beam and the engine of the all-terrain vehicle provided by an embodiment of the present application;

[0022] Figure 6 is a top view of the internal structure of the all-terrain vehicle with the frame removed provided by an embodiment of the present application;

[0023] Figure 7 is a sectional view of the engine of the all-terrain vehicle provided by an embodiment of the present application;

[0024] Figure 8 is a left view of the assembly of the engine, frame and running system of the all-terrain vehicle provided by an embodiment of the present application. Detailed Embodiments

[0025] The present invention will be described in detail below in conjunction with the specific embodiments shown in the drawings. However, these embodiments do not limit the present invention, and any structural, method, or functional transformation made by those of ordinary skill in the art based on these embodiments is included in the protection scope of the present invention.

[0026] Such as Figures 1 to 3As shown in the figure, the present application provides an all-terrain vehicle 100, which includes a frame 11, a body covering 12, a running system 13, a suspension system 14, a power assembly 15, a transmission assembly 16, a fuel assembly 17, a seat assembly 19, a steering assembly 20, an electrical assembly 22, and a footrest assembly 27. Among them, the frame 11 constitutes the basic structure of the all-terrain vehicle 100, and the body covering 12 is at least partially disposed on the frame 11 and forms an accommodation space 115 with the frame 11. The power assembly 15 includes an engine 151, and the engine 151 is at least partially disposed in the accommodation space 115. The suspension system 14 is at least partially connected to the frame 11, and the running system 13 is connected to the frame 11 through the suspension system 14. The transmission assembly 16 is also in transmission connection with the engine 151 and can transmit the power of the engine 151 to the running system 13. The fuel assembly 17 is supported by the frame 11. The seat assembly 19 is for a user to ride on, and the footrest assembly 27 is disposed below the seat assembly 19. The steering assembly 20 can be operated to realize the steering of the all-terrain vehicle 100. In order to clearly define the technical solution of the present application, the front, rear, upper, lower, left, and right as shown in Figure 1 are also defined. Among them, the front-rear direction is the length direction of the frame 11, the left-right direction is the width direction of the frame 11, and the up-down direction is the height direction of the frame 11. A plane perpendicular to the height direction of the all-terrain vehicle 100 and passing through at least one contact point of the running system 13 with the horizontal plane is defined as a reference plane 102. A plane perpendicular to the length direction of the frame 11 and passing through the midpoint of the wheelbase of the all-terrain vehicle 100 is defined as the lateral center plane 105 of the all-terrain vehicle 100. A plane perpendicular to the width direction of the frame 11 and passing through the midpoint of the width of the all-terrain vehicle 100 is defined as the longitudinal center plane 10s of the all-terrain vehicle 100, and the seat assembly 19 straddles the longitudinal center plane 10s.

[0027] As Figures 2 to 4 shown, as an implementation manner, the engine 151 provided in the embodiment of the present application includes a cylinder head 1512, a cylinder 1513, and a cylinder head 1514. Along the height direction of the all-terrain vehicle 100, the cylinder head 1512 is used to close the cylinder head 1514, and the cylinder head 1514 is connected to the cylinder 1513 and is located above the cylinder 1513. Along the width direction of the all-terrain vehicle 100, the cylinder heads 1514 are distributed along the width direction of the all-terrain vehicle 100 and are provided with a plurality of them. Along the front-rear direction of the all-terrain vehicle 100, the cylinder head 1514 is disposed towards the rear end of the all-terrain vehicle 100. It can be understood that according to the power requirements of the all-terrain vehicle 100, the cylinder head 1514 can be provided with 1, 2, 3, or more, which is not limited herein.

[0028] As an optional implementation, the powertrain 15 further includes a continuously variable transmission mechanism 152 and a magneto 157. The continuously variable transmission mechanism 152 and the engine 151 are distributed along the width direction of the all-terrain vehicle 100, and the continuously variable transmission mechanism 152 is in transmission connection with the engine 151. The continuously variable transmission mechanism 152 is provided with a driving pulley 1521 and a driven pulley 1522. The driving pulley 1521 is in transmission connection with the driven pulley 1522. The magneto 157 can be driven to generate electricity. As an implementation, the magneto 157 is arranged on the right side of the all-terrain vehicle 100, and the driving pulley 1521 is arranged on the left side of the all-terrain vehicle 100.

[0029] As Figures 2 to 5 shown, the frame 11 includes a main frame 113. The main frame 113 includes an upper main beam 1131 and a lower main beam 1132, an upper cross beam 1134, and longitudinal beams 1133 arranged between the upper main beam 1131 and the lower main beam 1132. Along the height direction of the all-terrain vehicle 100, the longitudinal beams 1133 are used to connect the upper main beam 1131 and the lower main beam 1132. The upper main beam 1131 includes two upper main beam tubes that are basically symmetrically distributed about the longitudinal central plane 10s, and the lower main beam 1132 includes two lower main beam tubes that are basically symmetrically distributed about the longitudinal central plane 10s. Along the width direction of the frame 11, the two upper main beam tubes and the two lower main beam tubes are all connected by the cross beam 1134. It can be understood that the upper main beam 1131, the lower main beam 1132, and the cross beam 1134 surround and form the above-mentioned accommodation space 115, and at least part of the engine 151 and the transmission assembly 16 are arranged in the accommodation space 115. Specifically, along the height direction of the frame 11, the distance range between the uppermost end of the cylinder head 1514 of the engine 151 and the lowermost end of the upper main beam 1131 is 10 mm to 50 mm. If the distance is less than 10 mm, the heat of the cylinder head 1514 will be transferred above the seat cushion, affecting the user experience and making it inconvenient to install the engine 151. If the distance is greater than 50 mm, the space between the upper main beam 1131 and the lower main beam 1132 will be wasted, unable to meet the installation requirements of other parts.

[0030] As an implementation method, the distance range between the uppermost end of the cylinder head 1514 of the engine 151 and the lowermost end of the upper main beam 1131 is from 20 mm to 40 mm. In some embodiments, the distance range between the uppermost end of the cylinder head 1514 of the engine 151 and the lowermost end of the upper main beam 1131 is from 25 mm to 35 mm. Through the above settings, not only can a reliable distance between the cylinder head 1514 and the frame 11 be ensured, avoiding the heat transfer from the cylinder head 1514 to the frame 11, thus generating heat conduction and affecting the user experience, but also the disassembly and assembly of the engine 151 can be facilitated, improving the convenience of maintenance and assembly. Moreover, the space between the upper main beam 1131 and the lower main beam 1132 can be effectively utilized, avoiding space waste, and further improving the space utilization rate of the all-terrain vehicle 100.

[0031] As Figures 4 to 7 shown, as an implementation method, the engine 151 further includes at least two cylinder heads 1514 arranged in parallel on the cylinder 1513 and a cylinder head cover 1512 installed on the cylinder head 1514, and the two cylinder heads 1514 are arranged on the cylinder 1513. The cylinder head 1514 is arranged towards the rear side of the all-terrain vehicle 100. The orthographic projection of the cylinder head cover 1512 on the reference plane 102 is defined as the cylinder head cover projection area S1; the area surrounded by the orthographic projection of the upper main beam 1131 on the reference plane 102 along the height direction of the frame 11 is defined as the upper main beam projection closed area; the part of the cylinder head cover projection area S1 that falls into the upper main beam projection closed area is defined as the closed area projection S2, and the ratio range of the closed area projection S2 to the cylinder head cover projection area S1 is from 0.6 to 0.9.

[0032] Among them, the ratio range of the closed area projection S2 to the cylinder head cover projection area S1 is from 0.6 to 0.9. In fact, when the ratio of the closed area projection S2 to the cylinder head cover projection area S1 is less than 0.6, it will cause the engine 151 to occupy too little internal space of the frame 11, resulting in excessive leakage of the cylinder head 1514, thus increasing the heat insulation cost of the all-terrain vehicle 100 and even possibly causing the center of gravity of the all-terrain vehicle 100 to be offset, affecting the stability of the all-terrain vehicle 100.

[0033] As an implementation method, the ratio range of the closed area projection S2 to the cylinder head cover projection area S1 is from 0.7 to 0.85. Further, the ratio range of the closed area projection S2 to the cylinder head cover projection area S1 is from 0.75 to 0.8. Through this setting, the engine 151 can occupy as much internal space of the frame 11 as possible, improving the utilization rate of the internal space of the frame 11, so that the related components of the engine 151 can be avoided from extending out of the space formed by the frame 11, and thus the heat insulation mechanism or the heat insulation cost can be avoided from increasing.

[0034] As an implementation, the cylinder head 1514 includes a left cylinder head 1514a and a right cylinder head 1514b. The left cylinder head 1514a and the right cylinder head 1514b are distributed along the width direction of the frame 11 and are arranged substantially parallel. Along the width direction of the frame 11, the left cylinder head 1514a is disposed on the left side of the all-terrain vehicle 100, and the right cylinder head 1514b is disposed on the right side of the all-terrain vehicle 100. The cylinder 1513 includes a left cylinder 1513a and a right cylinder 1513b. The left cylinder head 1514a is disposed on the left cylinder 1513a, and the right cylinder head 1514b is disposed on the right cylinder 1513b. The central axis of the left cylinder 1513a is the left cylinder axis, and the central axis of the right cylinder 1513b is the right cylinder axis. The horizontal distance from the left cylinder axis to the longitudinal central plane 10s is the first distance W1, that is, the left cylinder spacing. The horizontal distance from the right cylinder axis to the longitudinal central plane 10s is the second distance W2, that is, the right cylinder spacing. The ratio range between the first distance W1 and the second distance W2 is from 0 to 1. The ratio range between the first distance W1 and the second distance W2 is from 0.2 to 0.8. As an implementation, the ratio range between the first distance W1 and the second distance W2 is from 0.4 to 0.6. As an implementation, the distance range of the first distance W1 is from 0 mm to 80 mm, and the second distance W2 is from 80 mm to 160 mm. As an implementation, the first distance W1 is 25 mm, the second distance W2 is 130 mm, and the left cylinder axis and the right cylinder axis are both on the same side of the longitudinal central plane 10s, and the ratio between the first distance W1 and the second distance W2 is 0.19. As an implementation, the first distance W1 is 20 mm, the second distance W2 is 95 mm, and the left cylinder axis and the right cylinder axis are both on both sides of the longitudinal central plane 10s, and the ratio between the first distance W1 and the second distance W2 is 0.21.

[0035] It can be understood that there is a preset gap between the left cylinder head 1514a and the right cylinder head 1514b along the width direction of the frame 11. As an implementation, the range of this preset gap is from 6 mm to 12 mm. Through such a setting, on the one hand, the internal space of the frame 11 can be fully utilized, and on the other hand, it can also ensure that there is enough gap between the left cylinder head 1514a and the right cylinder head 1514b, so that the heat generated by the left cylinder head 1514a and the right cylinder head 1514b can be quickly dissipated, avoiding damage to the engine caused by overheating, and at the same time, it can also avoid the mutual influence of the heat radiation between the left cylinder head 1514a and the right cylinder head 1514b, thereby affecting the heat dissipation efficiency.

[0036] As an implementation, the upper main beam 1131 includes a left upper main beam 1131a and a right upper main beam 1131b. The left upper main beam 1131a and the right upper main beam 1131b each extend along the length direction of the all-terrain vehicle 100. When the rider straddles the all-terrain vehicle 100, at the longitudinal positions of the left upper main beam 1131a and the right upper main beam 1131b where the rider's legs are located, the minimum distance between the left upper main beam 1131a and the right upper main beam 1131b is defined as the third distance W3, that is, the straddle width. At the longitudinal position closest to the left cylinder axis and the right cylinder axis, there is a fourth distance W4 between the left upper main beam 1131a and the right upper main beam 1131b, that is, the top width of the engine 151. The fourth distance W4 is greater than the third distance W3.

[0037] As an implementation, the first distance W1 or the second distance W2 is less than half of the third distance W3, and the sum of the first distance W1 and the second distance W2 is less than the fourth distance W4.

[0038] As an implementation, the first distance W1 is less than half of the fourth distance W4.

[0039] Through the above settings, the layout between the engine 151 and the frame 11 can be made more reasonable, with higher space utilization rate, and the engine 151 will not be overly offset towards one side of the longitudinal center plane 10s, thus affecting the clamping of the rider or increasing the heat of the rider's legs and the heat insulation cost. Therefore, the layout position between the engine 151 and the upper main beam 1131 is reasonable as described above, which is convenient for the rider's legs to be clamped, and improves the stability and safety of riding.

[0040] Such as Figure 4As shown, in the width direction of the frame 11, the vertical distance between the leftmost side of the left cylinder head 1514a and the longitudinal center plane 10s is set as W5, and the vertical distance between the rightmost side of the right cylinder head 1514b and the longitudinal center plane 10s is set as the sixth distance W6. Among them, the ratio range of the fifth distance W5 to the sixth distance W6 is 0.2 to 1.8. As an implementation manner, the ratio range of the fifth distance W5 to the sixth distance W6 is 0.5 to 1.5. As an implementation manner, the ratio range of the fifth distance W5 to the sixth distance W6 is 0.8 to 1.2. Through the above settings, it can be ensured that there is a certain distance between the clamping positions of the left cylinder head 1514a and the right cylinder head 1514b and the human legs, and they will not be overly offset, so that the heat generated by the left cylinder head 1514a and the right cylinder head 1514b can be quickly dissipated, avoiding engine damage caused by overheating. At the same time, it can also prevent the heat of the left cylinder head 1514a and the right cylinder head 1514b from affecting the driving experience of the driver and passengers. As an implementation manner, the distance between the leftmost side of the engine 151 and the longitudinal center plane 10s is set as the seventh distance W7, and the distance between the rightmost side of the engine 151 and the longitudinal center plane 10s is set as the eighth distance W8. Among them, the ratio of the seventh distance W7 to the eighth distance W8 is set in the range of 0.6 to 1.3. Further, the ratio range of the seventh distance W7 to the eighth distance W8 is 0.7 to 1.2. As an implementation manner, the ratio range of the seventh distance W7 to the eighth distance W8 is 0.8 to 1. In fact, the ratio of the seventh distance W7 to the eighth distance W8 can also be set to 0.9. Through such settings, the engine 151 can be set narrower in the width direction of the frame 11, with good clamping performance and good human-machine relationship during driving by the driver and passengers, greatly improving the user experience.

[0041] As Figures 1 to 3 shown, the steering assembly 20 is arranged on the frame 11 and is located at the front side of the all-terrain vehicle 100. The engine 151 further includes an intake assembly 1516 and an air intake port 1517. The air intake port 1517 is arranged on the engine 151 housing and is connected to the intake assembly 1516. The intake assembly 1516 includes an intake pipe and an air filter. The intake pipe connects the air filter and the air intake port 1517, so as to deliver the air filtered by the air filter to the air intake port 1517 to meet the intake requirements of the engine 151. As an implementation manner, the orthographic projection of the frame 11 in the reference plane 102 is the first projection, and the orthographic projection of the air intake port 1517 in the reference plane 102 is the second projection. The second projection is arranged in an area outside the first projection. The air intake port 1517 is arranged between the steering assembly 20 and the cylinder head 1514, so that the intake is smoother and the layout of the intake structure is convenient.

[0042] As Figure 3As shown, the fuel assembly 17 includes a fuel tank 171 for supplying energy to the engine 151. Along the front-back direction of the all-terrain vehicle 100, the air filter is disposed between the fuel tank 171 and the engine 151. That is, the engine 151 is disposed at the rear side, the fuel tank 171 is disposed at the front side, and the air filter is disposed in the middle. As an implementation manner, along the up-down direction of the all-terrain vehicle 100, the fuel tank 171 is disposed between the upper main beam 1131 and the lower main beam 1132. As an implementation manner, the fuel tank 171 can be disposed at a position close to the upper main beam 1131. As Figure 5 shown, as another implementation manner, the fuel tank 171 can also be disposed at a position close to the lower main beam 1132, so that the center of gravity of the all-terrain vehicle 100 is lower, improving the controllability of the all-terrain vehicle 100; at the same time, the space at the front part of the all-terrain vehicle 100 can be fully utilized.

[0043] As Figure 3 , Figure 8 shown, the cylinder 1513 has a cylinder axis 10m, and the orthographic projection of the cylinder axis 10m on the longitudinal central plane 10s is the cylinder axis projection. As an implementation manner, the included angle κ between the cylinder axis projection and the reference plane 102 ranges from 45° to 65°. As another implementation manner, the included angle κ between the cylinder axis projection and the reference plane 102 ranges from 50° to 60°. By such a setting, the height of the cylinder head 1514 of the engine 151 can be controlled within a reasonable range, which is beneficial to the overall vehicle layout, makes the layout structure of the engine 151 compact, and facilitates the more smooth routing of the intake system and the exhaust system of the engine 151, improving the performance and reliability of the engine 151.

[0044] As an alternative implementation, the connection line of 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 opening of the included angle β formed by the cylinder axis projection 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 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 and the projection connection line 152a is 45° to 65°. For example, in this implementation, the included angle β formed by the cylinder axis projection 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. And, through the above settings, it can also avoid the increase in the length of the exhaust pipe 321 caused by the included angle β formed by the cylinder axis projection and the projection connection line 152a being too large, which is beneficial to shortening the overall length of the exhaust pipe 321. In addition, it can also avoid the cylinder head 1514 being too far back due to the included angle β formed by the cylinder axis projection 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.

[0045] As Figure 2As shown in the figure, along the width direction of the frame 11, the pedal assemblies 27 are arranged on both sides of the frame 11 in the width direction. Specifically, the pedal assembly 27 includes a left pedal 271 and a right pedal 272, and the left pedal 271 and the right pedal 272 are symmetrically distributed about the longitudinal central plane 10s. As an implementation manner, the left pedal 271 is provided with left pedal serrations 2711 for increasing friction, and the right pedal 272 is provided with right pedal serrations 2721 for increasing friction. Both the left pedal serrations 2711 and the right pedal serrations 2721 can be set to adapt to the shape of the pedal. As an implementation manner, the left pedal serrations 2711 and the right pedal serrations 2721 are set to be rectangular. The orthographic projection of the left pedal serrations 2711 on the reference plane 102 is the left pedal serration projection 2711a, and the orthographic projection of the right pedal serrations 2721 on the reference plane 102 is the right pedal serration projection 2721a. As an implementation manner, the running system 13 includes a front wheel 132 and a rear wheel 133. The front wheel 132 has a first rotation center 132a, and the rear wheel 133 has a second rotation center 133a. Along the length direction of the frame 11, the left pedal serration projection 2711a and the right pedal serration projection 2721a are located between the first rotation center 132a and the second rotation center 133a, and are located at the middle position between the first rotation center 132a and the second rotation center 133a. As an implementation manner, the front wheel 132 includes a left front wheel 1321 and a right front wheel 1322, and the rear wheel 133 includes a left rear wheel 1331 and a right rear wheel 1332. The longitudinal central plane 10s passes through the midpoint of the distance between the left front wheel 1321 and the right front wheel 1322. The orthographic projections of the left front wheel 1321, the right front wheel 1322, the left rear wheel 1331 and the right rear wheel 1332 in the reference plane 102 surround to form a projection area, and both the left pedal serration projection 2711a and the right pedal serration projection 2721a are arranged in this projection area.

[0046] As an implementation, along the front-back direction of the all-terrain vehicle 100, the distance L between the rightmost side of the left footrest sawtooth projection 2711a and the rotation center of the driving wheel 1521 is greater than 0 to 420 mm. The distance between the leftmost side of the right footrest sawtooth projection 2721a and the rotation center of the magneto 157 is greater than 0 to 420 mm. When the distance between the left footrest sawtooth projection 2711a and the rotation center of the driving wheel 1521 is greater than 420 mm, the center of gravity of the all-terrain vehicle 100 will be rearward, and the stability of the all-terrain vehicle 100 will be poor. When the distance between the right footrest sawtooth projection 2721a and the rotation center of the magneto 157 is greater than 420 mm, the center of the all-terrain vehicle 100 will be rearward, and the stability of the all-terrain vehicle 100 will be poor. It can be understood that along the front-back direction of the all-terrain vehicle 100, the distance range between the rightmost side of the left footrest sawtooth projection 2711a and the rotation center of the driving wheel 1521 is 40 mm to 380 mm. The distance range between the leftmost side of the right footrest sawtooth projection 2721a and the rotation center of the magneto 157 is 40 mm to 380 mm. Further, along the front-back direction of the all-terrain vehicle 100, the distance range between the rightmost side of the left footrest sawtooth projection 2711a and the rotation center of the driving wheel 1521 is 60 mm to 300 mm. The distance range between the leftmost side of the right footrest sawtooth projection 2721a and the rotation center of the magneto 157 is 60 mm to 300 mm.

[0047] As an implementation, the distance between the rightmost side of the left footrest sawtooth projection 2711a and the leftmost side of the driving wheel 1521 is set to be greater than 0 to 150 mm, and the distance between the rightmost side of the right footrest sawtooth projection 2721a and the rightmost side of the magneto 157 is set to be greater than 0 to 150 mm. It can be understood that the distance between the rightmost side of the left footrest sawtooth projection 2711a and the leftmost side of the driving wheel 1521 is set in the range of 40 mm to 110 mm, and the distance between the rightmost side of the right footrest sawtooth projection 2721a and the rightmost side of the magneto 157 is set in the range of 40 mm to 110 mm. Further, the distance between the rightmost side of the left footrest sawtooth projection 2711a and the leftmost side of the driving wheel 1521 is set in the range of 60 mm to 90 mm, and the distance between the rightmost side of the right footrest sawtooth projection 2721a and the rightmost side of the magneto 157 is set in the range of 60 mm to 90 mm. Through the above settings, the layout of the engine 151 can be effectively improved, and the engine 151 can be set more in the middle position of the all-terrain vehicle 100 to a greater extent, and the cylinder head 1514 can be effectively oriented toward the rear of the all-terrain vehicle 100, so that the heat of the engine 151 can be effectively away from the driver and passenger, effectively improving the user experience.

[0048] It should be understood that those of ordinary skill in the art can make improvements or modifications based on the above description, and all such improvements and modifications shall fall within the scope of protection of the appended claims of this application.

Claims

1. An all-terrain vehicle, comprising: A frame, the frame including an upper main beam, a lower main beam, and longitudinal beams connected between the upper main beam and the lower main beam; A body covering, the body covering being supported by at least one of the upper main beam, the lower main beam, and the longitudinal beams; A running system, the running system being at least partially located below the frame and including a left front wheel, a right front wheel, and a rear wheel; A suspension system, the suspension system being supported by the lower main beam; An engine, the engine being in transmission connection with the rear wheel, the engine including a cylinder and an exhaust passage, the exhaust passage being connected to the cylinder; An exhaust assembly, the exhaust assembly including an exhaust pipe connected to the exhaust passage and a muffler connected to the exhaust pipe; A continuously variable transmission mechanism, the continuously variable transmission mechanism including a driving wheel and a driven wheel, the driving wheel being in transmission connection with the driven wheel; It is characterized in that Define a plane perpendicular to the width direction of the frame and passing through the midpoint of the width of the frame as the longitudinal central plane. The opening of the exhaust passage faces the rear of the all-terrain vehicle, and the rearmost end of the continuously variable transmission mechanism is located in front of the rearmost end of the exhaust passage; the driving wheel is located behind the driven wheel, and the connecting line of the orthographic projection of the central axis 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 is the projection connecting line. The cylinder has a cylinder axis, and the orthographic projection of the cylinder axis on the longitudinal central plane is the cylinder axis projection. The included angle between the cylinder axis projection and the projection connecting line has an opening facing 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 1, 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 Define a reference plane perpendicular to the height direction of the frame. The range of the angle formed by the cylinder axis projection and the reference plane is 45° to 65°, and the opening of the included angle is arranged towards the rear of the all-terrain vehicle.

5. The all-terrain vehicle according to claim 4, characterized in that The range of the angle formed by the cylinder axis projection and the reference plane is 50° to 60°.

6. The all-terrain vehicle according to claim 4, characterized in that The engine further includes two cylinder heads arranged side by side on the cylinder and a cylinder head cover installed on the cylinder heads. Define a plane perpendicular to the height direction of the frame and passing through at least one contact point of the running system with the horizontal plane as the reference plane. The orthographic projection of the cylinder head cover on the reference plane is defined as the cylinder head cover projection area; the area surrounded by the orthographic projection of the upper main beam on the reference plane along the height direction of the frame is defined as the upper main beam projection closed area; the part of the cylinder head cover projection area that falls into the upper main beam projection closed area is defined as the closed area projection, and the ratio of the area of the closed area projection to the area of the cylinder head cover projection area ranges from 0.6 to 0.

9.

7. The all-terrain vehicle according to claim 6, wherein in the height direction of the frame, the distance range between the uppermost end of the cylinder head and the lowermost end of the upper main beam is 10 mm to 50 mm.

8. The all-terrain vehicle according to claim 6, wherein the range of the area ratio between the projection of the closed area and the projection area of the cylinder head is 0.7 to 0.

85.

9. The all-terrain vehicle according to claim 1, wherein the all-terrain vehicle further includes a footrest assembly, and the footrest assembly includes a left footrest serration and a right footrest serration; the all-terrain vehicle includes a magneto and a driving wheel, the magneto is disposed on one side of the all-terrain vehicle, and the driving wheel is disposed on the other side of the all-terrain vehicle; a plane perpendicular to the height direction of the frame and passing through at least one contact point of the running system with the horizontal plane is defined as a reference plane; the positive projection of the left footrest serration on the reference plane is the left footrest serration projection, and the positive projection of the right footrest serration on the reference plane is the right footrest serration projection. Along the length direction of the frame, the distance range between the rightmost side of the left footrest serration projection and the rotation center of the driving wheel is 0 to 420 mm; the distance range between the leftmost side of the right footrest serration projection and the rotation center of the magneto is 0 mm to 420 mm.

10. The all-terrain vehicle according to claim 9, wherein along the length direction of the frame, the distance range between the rightmost side of the left footrest serration projection and the rotation center of the driving wheel is 40 mm to 380 mm; the distance range between the leftmost side of the right footrest serration and the rotation center of the magneto is 40 mm to 380 mm.

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