All-terrain vehicle

Abstract

The all-terrain vehicle comprises a vehicle frame, a vehicle body covering part, a suspension system, a walking system and an engine, and the engine is used for driving the walking system; the engine comprises a left air cylinder, a right air cylinder, a left cylinder head arranged on the left air cylinder and a right cylinder head arranged on the right air cylinder, the horizontal distance from the axis of the left air cylinder to the longitudinal center plane is a first distance, and the horizontal distance from the axis of the right air cylinder to the longitudinal center plane is a second distance. A third distance and a fourth distance are arranged between the upper left main beam and the upper right main beam, the fourth distance is larger than the third distance, the first distance or the second distance is smaller than half of the third distance, and the sum of the first distance and the second distance is smaller than the fourth distance. 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 increasingly popular among consumers. The areas where all-terrain vehicles travel include wild fields such as deserts, jungles, mudflats, riverbeds, and wastelands. Due to 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 towards the rear, so that the temperature of the part close to the driver's body when straddling the vehicle, especially the position close to the legs, will be relatively high, thus reducing the driving experience of the driver. Summary of the Invention

[0004] 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] To achieve the above object, the present invention adopts the following technical solutions:

[0006] An all-terrain vehicle, comprising: a frame, the frame includes an upper main beam, a lower main beam, and a connecting bracket connecting the upper main beam and the lower main beam; a body cover, the body cover is supported by the frame; a suspension system, the suspension system is supported by the frame; a running system, the running system is at least partially connected to the frame through the suspension system; an engine, the engine is used to drive the running system; the engine includes a left cylinder, a right cylinder, a left cylinder head disposed on the left cylinder, and a right cylinder head disposed on the right cylinder; 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 center plane, the longitudinal center plane passes through the midpoint of the distance between the left front wheel and the right front wheel; the central axis of the left cylinder is the left cylinder axis, the central axis of the right cylinder is the right cylinder axis, the horizontal distance from the left cylinder axis to the longitudinal center plane is the first distance, the horizontal distance from the right cylinder axis to the longitudinal center plane is the second distance, the upper main beam includes a left upper main beam and a right upper main beam, the left upper main beam and the right upper main beam each extend along the length direction of the all-terrain vehicle, the straddling width between the left upper main beam and the right upper main beam is the third distance; at the longitudinal position closest to the left cylinder axis and the right cylinder axis, the distance between the left upper main beam and the right upper main beam is the fourth distance, the fourth distance is greater than the third distance, the first distance or the second distance is less than half of the third distance, and the sum of the first distance and the second distance is less than the fourth distance.

[0007] Furthermore, the first distance is less than half of the fourth distance.

[0008] Further, the ratio range between the first distance and the second distance is from 0.4 to 0.6.

[0009] Further, the vertical distance between the leftmost side of the left cylinder head and the longitudinal central plane is defined as the fifth distance, and the vertical distance between the rightmost side of the right cylinder head and the longitudinal central plane is defined as the sixth distance. The ratio range between the fifth distance and the sixth distance is from 0.2 to 1.8.

[0010] Further, the ratio range between the fifth distance and the sixth distance is from 0.5 to 1.5.

[0011] Further, the ratio range between the fifth distance and the sixth distance is from 0.8 to 1.2.

[0012] Further, 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 the contact point of the running system with the ground 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 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.

[0013] Further, 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 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.

[0014] Further, the included angle range between the extending direction where the central axis of the cylinder head is located and the reference plane is from 45° to 65°.

[0015] Further, the distance between the leftmost side of the engine and the longitudinal central plane is defined as the seventh distance, and the distance between the rightmost side of the engine and the longitudinal central plane is defined as the eighth distance; the ratio range between the seventh distance and the eighth distance is from 0.6 to 1.3.

[0016] In the above settings, the engine includes a cylinder and a cylinder head. The cylinder head includes a left cylinder head and a right cylinder head, and both the left cylinder head and the right cylinder head are disposed on the cylinder. 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 center plane. The engine includes a left cylinder, a right cylinder, a left cylinder head disposed on the left cylinder, and a right cylinder head disposed on the right cylinder. The horizontal distance from the axis of the left cylinder to the longitudinal center plane is the first distance, and the horizontal distance from the axis of the right cylinder to the longitudinal center plane is the second distance. The upper main beam includes a left upper main beam and a right upper main beam, and there are a third distance and a fourth distance between the left upper main beam and the right upper main beam. The fourth distance is greater than the third distance. The first distance or the second distance is less than half of the third distance, and the sum of the first distance and the second distance is less than the fourth distance. By reasonably arranging the engine, an all-terrain vehicle with good heat dissipation effect and good riding experience is provided. BRIEF 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, the frame and the running system of the all-terrain vehicle provided by an embodiment of the present application. DETAILED DESCRIPTION OF THE 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] 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 cover 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. The body cover 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 heads 1514 are disposed towards the rear end of the all-terrain vehicle 100. It can be understood that according to the power requirement of the all-terrain vehicle 100, the cylinder heads 1514 can be provided with 1, 2, 3, or more, which is not limited herein.

[0028] As an alternative embodiment, 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 drivingly connected to 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 drivingly connected to the driven pulley 1522. The magneto 157 can be driven to generate electricity. As one implementation, the magneto 157 is disposed on the right side of the all-terrain vehicle 100, and the driving pulley 1521 is disposed 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 main beam 1131, a lower main beam 1132, a cross beam 1134, and a longitudinal beam 1133 disposed between the upper main beam 1131 and the lower main beam 1132. Along the height direction of the all-terrain vehicle 100, the longitudinal beam 1133 is 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 substantially symmetrically distributed about the longitudinal center plane 10s, and the lower main beam 1132 includes two lower main beam tubes that are substantially symmetrically distributed about the longitudinal center 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 enclose the above-mentioned accommodation space 115, and the engine 151 and the transmission assembly 16 are at least partially disposed 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, and the installation requirements of other parts cannot be met.

[0030] As an implementation, 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 heat transfer from the cylinder head 1514 to the frame 11, thereby 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 thus improving the space utilization rate of the all-terrain vehicle 100.

[0031] As Figures 4 to 7 shown, as an implementation, the engine 151 further includes at least two cylinder heads 1514 arranged side by side on the cylinder 1513 and a cylinder head cover 1512 mounted on the cylinder head 1514. 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, the engine 151 will occupy too little internal space of the frame 11, resulting in excessive exposure of the cylinder head 1514, thereby 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, 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, thereby avoiding relevant components of the engine 151 from extending out of the space formed by the frame 11, and thus being able to avoid adding heat insulation mechanisms or increasing heat insulation costs.

[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 range of the first distance W1 is from 0 mm to 200 mm, the second distance W2 is from 200 mm to 400 mm, and the ratio range between the first distance W1 and the second distance W2 is from 0.4 to 0.6. As an implementation, the first distance W1 is 25 mm, the second distance W2 is 130 mm, and both the left cylinder axis and the right cylinder axis are on the same side of the longitudinal central plane 10s. 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 on both sides of the longitudinal central plane 10s. The ratio between the first distance W1 and the second distance W2 is 0.21.

[0035] It can be understood that along the width direction of the frame 11, there is a preset gap between the left cylinder head 1514a and the right cylinder head 1514b. 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 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 due to overheating, and at the same time, it can also prevent the heat radiation between the left cylinder head 1514a and the right cylinder head 1514b from affecting each other, 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 to one side of the longitudinal center plane 10s, thus affecting the rider's clamping or increasing the heat of the rider's legs and increasing the heat insulation cost. Therefore, the layout position between the engine 151 and the upper main beam 1131 is reasonable, facilitating the rider's legs to be conveniently clamped, and improving the stability and safety of riding.

[0040] Such as Figure 4As shown in the figure, 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 too 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, and at the same time, it can also avoid the heat of the left cylinder head 1514a and the right cylinder head 1514b 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, greatly improving the user experience.

[0041] As Figures 1 to 3 shown, the steering assembly 20 is disposed 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 disposed 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 requirement 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 disposed in a region outside the first projection. The air intake port 1517 is disposed 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-rear direction of the all-terrain vehicle 100, the air filter is arranged between the fuel tank 171 and the engine 151. That is, the engine 151 is arranged at the rear side, the fuel tank 171 is arranged at the front side, and the air filter is arranged in the middle. As an implementation manner, along the up-down direction of the all-terrain vehicle 100, the fuel tank 171 is arranged between the upper main beam 1131 and the lower main beam 1132. As an implementation manner, the fuel tank 171 can be arranged close to the upper main beam 1131. As Figure 5 shown, as another implementation manner, the fuel tank 171 can also be arranged 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 projection line. As an implementation manner, the included angle κ between the cylinder projection line and the reference plane 102 ranges from 45° to 65°. Through 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 is conducive to the smoother flow of the intake and exhaust systems of the engine 151, improving the performance and reliability of the engine 151.

[0044] As an alternative implementation, the line connecting the orthographic projection of the axis center of the driving wheel 1521 on the longitudinal central plane 10s and the orthographic projection of the axis center of the driven wheel 1522 on the longitudinal central plane 10s is the transmission projection line 152a. The opening of the included angle β formed by the cylinder projection line and the transmission projection line 152a is arranged towards the rear of the all-terrain vehicle 100, and the angle range of the included angle β is from 35° to 75°. Specifically, the angle range of the included angle β formed by the cylinder projection line and the transmission projection line 152a is from 40° to 70°. More specifically, the angle range of the included angle β formed by the cylinder projection line and the transmission projection line 152a is from 45° to 65°. For example, in this implementation, the included angle β formed by the cylinder projection line and the transmission projection 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 projection line and the transmission projection line 152a being too large, thus facilitating the shortening of 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 projection line and the transmission projection 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, along the width direction of the frame 11, the pedal assemblies 27 are arranged on both sides in the width direction of the frame 11. 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 substantially. As an implementation manner, a left pedal serration 2711 for increasing friction is provided on the left pedal 271, and a right pedal serration 2721 for increasing friction is provided on the right pedal 272. Both the left pedal serration 2711 and the right pedal serration 2721 can be set to adapt to the shape of the pedal. As an implementation manner, the left pedal serration 2711 and the right pedal serration 2721 are set to be rectangular. The orthographic projection of the left pedal serration 2711 on the reference plane 102 is a left pedal serration projection 2711a, and the orthographic projection of the right pedal serration 2721 on the reference plane 102 is a 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 at a position in the middle 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-rear 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, it will cause the center of gravity of the all-terrain vehicle 100 to be rearward, and the stability of the all-terrain vehicle 100 is poor. When the distance between the right footrest sawtooth projection 2721a and the rotation center of the magneto 157 is greater than 420 mm, it will cause the center of the all-terrain vehicle 100 to be rearward, and the stability of the all-terrain vehicle 100 is poor. It can be understood that along the front-rear 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-rear 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 to be 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 to be 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 to be 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 to be 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 effectively face the rear of the all-terrain vehicle 100, so that the heat of the engine 151 can effectively stay 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 protection scope of the appended claims of this application.

Claims

1. An all-terrain vehicle, comprising: A frame, the frame includes an upper main beam, a lower main beam, and longitudinal beams connecting between the upper main beam and the lower main beam; A body covering, the body covering is supported by at least one of the upper main beam, the lower main beam, and the longitudinal beams A suspension system, the suspension system is supported by the lower main beam; A running system, the running system is at least partially connected to the frame through the suspension system, and the running system includes a left front wheel and a right front wheel; An engine, the engine is used to drive the running system; Characterized in that, The engine includes a left cylinder, a right cylinder, a left cylinder head provided on the left cylinder, and a right cylinder head provided on the right cylinder; Define a vertical direction perpendicular to the width direction of the frame and passing through the longitudinal center plane through the midpoint of the distance between the left front wheel and the right front wheel; The central axis of the left cylinder is the left cylinder axis, the central axis of the right cylinder is the right cylinder axis, the horizontal distance from the left cylinder axis to the longitudinal center plane is the first distance, and the horizontal distance from the right cylinder axis to the longitudinal center plane is the second distance; The upper main beam includes a left upper main beam and a right upper main beam, the left upper main beam and the right upper main beam each extend along the length direction of the all-terrain vehicle, and define the straddle width between the left upper main beam and the right upper main beam as the third distance; At the longitudinal position closest to the left cylinder axis and the right cylinder axis, there is a fourth distance between the left upper main beam and the right upper main beam; The fourth distance is greater than the third distance, the first distance or the second distance is less than half of the third distance, and the sum of the first distance and the second distance is less than the fourth distance.

2. The all-terrain vehicle according to claim 1, characterized in that, The first distance is less than half of the fourth distance.

3. The all-terrain vehicle according to claim 1, characterized in that, The ratio range between the first distance and the second distance is 0.4 to 0.

6.

4. The all-terrain vehicle according to claim 1, characterized in that, The vertical distance between the leftmost side of the left cylinder head and the longitudinal center plane is defined as the fifth distance, the vertical distance between the rightmost side of the right cylinder head and the longitudinal center plane is defined as the sixth distance, and the ratio range between the fifth distance and the sixth distance is 0.2 to 1.

8.

5. The all-terrain vehicle according to claim 4, characterized in that, The ratio range between the fifth distance and the sixth distance is 0.5 to 1.

5.

6. The all-terrain vehicle according to claim 4, characterized in that, The ratio range between the fifth distance and the sixth distance is 0.8 to 1.

2.

7. The all-terrain vehicle according to claim 1, characterized in that, The all-terrain vehicle further includes a foot pedal assembly, and the foot pedal assembly includes a left foot pedal serration and a right foot pedal 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 that is perpendicular to the height direction of the frame and passes through at least one contact point between the running system and the horizontal plane is defined as a reference plane; the orthographic projection of the left foot pedal serration on the reference plane is the left foot pedal serration projection, and the orthographic projection of the right foot pedal serration on the reference plane is the right foot pedal serration projection. Along the length direction of the frame, the distance range between the rightmost side of the left foot pedal 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 foot pedal serration projection and the rotation center of the magneto is from 0 mm to 420 mm.

8. The all-terrain vehicle according to claim 7, wherein Along the length direction of the frame, the distance range between the rightmost side of the left foot pedal serration projection and the rotation center of the driving wheel is from 40 to 380 mm; the distance range between the leftmost side of the right foot pedal serration and the rotation center of the magneto is from 40 to 380 mm.

9. The all-terrain vehicle according to claim 7, wherein, The included angle range between the extending direction of the central axis of the cylinder head and the reference plane is from 45° to 65°.

10. The all-terrain vehicle according to claim 1, wherein The distance between the leftmost side of the engine and the longitudinal central plane is defined as the seventh distance, and the distance between the rightmost side of the engine and the longitudinal central plane is defined as the eighth distance; the ratio range of the seventh distance to the eighth distance is from 0.6 to 1.3.

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