All-terrain vehicle

Abstract

The utility model provides an all-terrain vehicle, relates to the technical field of vehicles, and aims to solve the technical problem of poor maintenance efficiency of an air filter of the all-terrain vehicle. The all-terrain vehicle comprises a vehicle frame, and the vehicle frame comprises a front space, a middle space and a rear space in the first direction; the seat cushion is detachably installed on the frame, part of the seat cushion is located in the rear space, and part of the seat cushion is located in the middle space; the air inlet system comprises an air filter, the air filter is arranged below the seat cushion in the second direction, and the seat cushion is configured to be capable of forming a maintenance space of the air filter after being detached from the frame. According to the all-terrain vehicle, the air filter can be conveniently disassembled and assembled, and the maintenance efficiency is improved.

Description

Technical Field

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

[0002] All-terrain vehicles have good off-road performance and are gradually becoming suitable for sports, leisure, racing and other activities. All-terrain vehicles include an engine and an intake system connected to it. Due to the complex application environment of all-terrain vehicles, the intake system of all-terrain vehicles is usually equipped with an air filter to filter the air entering the engine combustion chamber to ensure combustion reliability.

[0003] The current air filter has a filter element, and the air filter is connected to the combustion chamber of the engine so that the air enters the combustion chamber of the engine after being purified by the filter element; the air filter is arranged at the head, tail or side of the all-terrain vehicle. However, this layout is not convenient for disassembling and assembling the air filter, resulting in poor maintenance efficiency. Utility Model Content

[0004] In view of the above problems, an embodiment of the present application provides an all-terrain vehicle that can facilitate the disassembly and assembly of the air filter to improve maintenance efficiency.

[0005] In order to achieve the above objectives, the embodiments of the present application provide the following technical solutions:

[0006] An embodiment of the present application provides an all-terrain vehicle, including a frame, wherein the frame includes a front space, a middle space and a rear space along a first direction; a seat cushion, which is detachably mounted on the frame, with part of the seat cushion being located in the rear space and part of the seat cushion being located in the middle space; an air intake system, which includes an air filter, wherein the air filter is arranged below the seat cushion along a second direction, and the seat cushion is configured to form an inspection space for the air filter after it is removed from the frame.

[0007] In one possible implementation, the intake system also includes an intake pipe and an intake manifold; the intake pipe is located in the front space, and the air filter is arranged between the intake pipe and the intake manifold; the intake manifold is located in the rear space, and the intake manifold is connected to the engine of the all-terrain vehicle.

[0008] In one possible implementation, the first end of the intake pipe has an air inlet; the air inlet is located at the rear side of the steering column of the all-terrain vehicle along the first direction; the air inlet is located at the top of the frame along the second direction; the second end of the intake pipe extends toward the rear side along the first direction and is connected to the air filter.

[0009] In a possible implementation, along the first direction, the opening of the air inlet is arranged backward; or along the second direction, the opening of the air inlet is arranged upward.

[0010] In a possible implementation, the air intake pipe is configured as a hose.

[0011] In a possible implementation, the intake system also includes a throttle and a pressure-stabilizing chamber; one end of the pressure-stabilizing chamber is connected to the intake manifold, and the other end of the pressure-stabilizing chamber is connected to one end of the throttle; the other end of the throttle is connected to the outlet end of the air filter, and the throttle is configured to control the gas flow into the pressure-stabilizing chamber.

[0012] In a possible implementation, the pressure stabilizing chamber is L-shaped as a whole; the throttle is arranged below the pressure stabilizing chamber, the throttle is connected to the bottom of the pressure stabilizing chamber, and the top of the pressure stabilizing chamber is connected to the intake manifold.

[0013] In a possible implementation, the intake system also includes an intake pressure sensor and a control module; the intake pressure sensor and the throttle valve are respectively connected to the control module signal; the intake pressure sensor is arranged in the pressure stabilizing chamber, and the intake pressure sensor is configured to collect the gas pressure in the pressure stabilizing chamber and transmit the collected actual pressure value to the control module; the control module has a preset pressure value, and the control module controls the opening of the throttle valve according to the actual pressure value and the preset pressure value.

[0014] In a possible implementation, the vehicle frame includes two top longitudinal beams extending along a first direction; the two top longitudinal beams are arranged opposite to each other along a third direction, and a bottom projection of the air filter relative to the vehicle frame is located between the two top longitudinal beams.

[0015] In a possible implementation, the all-terrain vehicle also includes a front half-axle and a rear half-axle; there is a first horizontal distance L1 between the air intake end of the pressure stabilizing chamber and the rear half-axle, and there is a second horizontal distance L2 between the air intake end of the pressure stabilizing chamber and the front half-axle; the ratio of the first horizontal distance L1 to the second horizontal distance L2 is in the range of 0.6-0.8; there is a third horizontal distance L3 between the air inlet of the intake pipe and the air inlet end of the air filter, and there is a fourth horizontal distance L4 between the air inlet of the intake pipe and the front half-axle; the ratio of the fourth horizontal distance L4 to the third horizontal distance L3 is less than 0.65.

[0016] Compared with the related art, the all-terrain vehicle provided in the embodiment of the present application has the following advantages:

[0017] The all-terrain vehicle provided in the embodiment of the present application has an air intake system located in the middle space, and the air filter of the air intake system is arranged below the seat cushion. When the seat cushion is removed from the frame, an inspection space for the air filter can be formed.

[0018] In the related art, the air filter of an all-terrain vehicle is arranged at the head, tail or side of the all-terrain vehicle and covered by a cover of the all-terrain vehicle to protect the air filter. However, when replacing and repairing the air filter, the cover needs to be disassembled, resulting in poor maintenance efficiency.

[0019] In the embodiment of the present application, the air filter is arranged under the seat cushion. When the air filter needs to be replaced or repaired, the seat cushion can be removed from the frame to form a repair space for the air filter. Compared with removing the cover to repair the air filter, the present application is more convenient to remove the seat cushion from the frame, which can improve the repair efficiency.

[0020] In addition to the technical problems solved by the embodiments of the present disclosure, the technical features that constitute the technical solutions, and the beneficial effects brought about by the technical features of the technical solutions described above, other technical problems that can be solved by the all-terrain vehicle provided by the embodiments of the present disclosure, other technical features included in the technical solutions, and the beneficial effects brought about by these technical features will be further described in detail in the specific implementation methods. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, a brief introduction will be given below to the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0022] Figure 1 An isometric side view of the intake system and the engine provided in the embodiment of the present application arranged on the vehicle frame Figure 1 ;

[0023] Figure 2 A front view of the arrangement of the intake system and the engine on the vehicle frame provided in the embodiment of the present application;

[0024] Figure 3 A schematic diagram of the structure of the air intake system provided in an embodiment of the present application;

[0025] Figure 4 A top view of the arrangement of the intake system and the engine on the vehicle frame provided in the embodiment of the present application;

[0026] Figure 5 A front view of an all-terrain vehicle provided in accordance with an embodiment of the present application.

[0027] Description of reference numerals:

[0028] 10- frame;

[0029] 101-front space; 102-middle space; 103-rear space;

[0030] 11-top longitudinal beam; 12-bottom longitudinal beam; 13-middle connecting beam;

[0031] 20-seat cushion;

[0032] 30-Intake system;

[0033] 31- Air filter;

[0034] 311-upper cover; 312-lower cover;

[0035] 32-intake pipe; 321-intake port;

[0036] 33-intake manifold;

[0037] 34-Throttle valve;

[0038] 35-pressure stabilizing chamber;

[0039] 40 - engine;

[0040] 100-All-terrain vehicle. DETAILED DESCRIPTION

[0041] As described in the background art, the air filter of the all-terrain vehicle in the related art is arranged at the head, tail or side of the all-terrain vehicle. This layout is not convenient for disassembling and assembling the air filter, resulting in poor maintenance efficiency. The inventors have found that the reason for this problem is:

[0042] The air filter of an all-terrain vehicle is arranged at the head, tail or side of the all-terrain vehicle and is covered by a cover of the all-terrain vehicle to protect the air filter. However, when replacing and repairing the air filter, the cover needs to be disassembled and assembled before further repairing the air filter. This process is time-consuming and labor-intensive, resulting in poor repair efficiency.

[0043] In response to the above technical problems, an embodiment of the present application provides an all-terrain vehicle, whose intake system is located in the middle space, and the air filter of the intake system is arranged under the seat cushion. When the seat cushion is removed from the frame or opened, an inspection space for the air filter can be formed.

[0044] With this arrangement, when the air filter needs to be replaced or repaired, the seat cushion can be removed from the frame to form a repair space for the air filter. Compared with removing the cover to repair the air filter, the present invention is more convenient to remove the seat cushion from the frame, which can improve the repair efficiency.

[0045] In order to make the above-mentioned purposes, features and advantages of the embodiments of the present application more obvious and understandable, the technical solutions in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work belong to the scope of protection of this application.

[0046] First, the coordinate system of the attached figure is explained. The X-axis direction is the first direction, which can be defined as the driving direction of the all-terrain vehicle; the Z-axis direction is the second direction, which can be defined as the height direction of the all-terrain vehicle; and the Y-axis direction is the third direction, which can be defined as the width direction of the all-terrain vehicle.

[0047] like Figure 1 , Figure 2 and Figure 5 As shown, the all-terrain vehicle 100 provided in the embodiment of the present application includes a frame 10, a seat cushion 20, an intake system 30 and an engine 40, wherein the frame 10 includes two top longitudinal beams 11, two bottom longitudinal beams 12 and a plurality of intermediate connecting beams 13, the two top longitudinal beams 11 are arranged relatively at the left and right sides of the frame 10 along a third direction, and each top longitudinal beam 11 extends along a first direction; the two bottom longitudinal beams 12 are arranged relatively at the left and right sides of the frame 10 along the third direction, and each bottom longitudinal beam 12 extends along the first direction.

[0048] Furthermore, the top longitudinal beam 11 and the bottom longitudinal beam 12 located on the same side of the frame 10 are arranged relatively along the second direction, and a plurality of intermediate connecting beams 13 are arranged on the frame 10 at intervals along the first direction; the intermediate connecting beams 13 are respectively connected to the top longitudinal beam 11 and the bottom longitudinal beam 12 along the second direction to divide the frame 10 into a front space 101, a middle space 102 and a rear space 103, that is, the frame 10 includes a front space 101, a middle space 102 and a rear space 103 along the first direction.

[0049] In the embodiment of the present application, the seat cushion 20 is detachably mounted on the top of the frame 10 and is used to support the driver. For example, the seat cushion 20 is detachably mounted on the top longitudinal beam 11, part of the seat cushion 20 is located in the middle space 102, and part of the seat cushion 20 is located in the rear space 103; when the driver rides the all-terrain vehicle 100, he can sit on the seat cushion 20.

[0050] The air intake system 30 is connected to the combustion chamber of the engine 40 and is used to provide gas to the combustion chamber of the engine 40. The air intake system 30 includes an air filter 31, and the air filter 31 is used to filter the air flowing to the combustion chamber. Along the second direction, the air filter 31 is detachably mounted on the frame 10 and is located below the seat cushion 20. The seat cushion 20 is configured to form an inspection space for the air filter 31 when it is removed from the frame 10.

[0051] like Figure 3 As shown, the air filter 31 includes an upper cover 311, a lower cover 312 and a filter element (not shown in the figure), wherein the upper cover 311 and the lower cover 312 are detachably connected together to form a accommodating space for the filter element. The bottom and the top of the air filter 31 are respectively provided with mounting brackets, and are detachably mounted on the vehicle frame 10 through the mounting brackets.

[0052] Exemplarily, the air outlet of the air filter 31 is located on the upper cover 311, and the upper cover 311 is connected to the top longitudinal beam 11 through a mounting bracket. The air inlet is located on the lower cover 312, and the lower cover 312 is connected to the middle connecting beam 13 through a mounting bracket, so that the air filter 31 is connected to the frame 10 through the mounting bracket. When the filter element of the air filter 31 needs to be inspected or replaced, the seat cushion 20 is removed from the frame 10, and an inspection port opposite to the air filter 31 can be formed on the top of the frame 10.

[0053] In the related art, the air filter of an all-terrain vehicle is arranged at the head, tail or side of the all-terrain vehicle and covered by a cover of the all-terrain vehicle to protect the air filter. However, when replacing and repairing the air filter, the cover needs to be disassembled, resulting in poor maintenance efficiency.

[0054] In the embodiment of the present application, the air filter 31 is disposed below the seat cushion 20. When the air filter 31 needs to be replaced or repaired, the seat cushion 20 only needs to be removed from the frame 10 to form a repair space for the air filter 31. Compared with removing the cover to repair the air filter, it is more convenient to remove the seat cushion 20 from the frame 10 in the embodiment of the present application, which can improve the repair efficiency.

[0055] Furthermore, in the embodiment of the present application, the intake system 30 further includes an intake pipe 32 and an intake manifold 33, and the air filter 31 is disposed between the intake pipe 32 and the intake manifold 33, and is respectively connected to the intake pipe 32 and the intake manifold 33. The intake pipe 32 is located in the front space 101, and the first end of the intake pipe 32 has an air inlet 321, and the second end of the intake pipe 32 extends toward the rear side along the first direction and is connected to the intake end of the air filter 31 to provide air to the air filter 31.

[0056] The intake manifold 33 is located in the rear space 103 , and one end of the intake manifold 33 is used to communicate with the air outlet end of the air filter 31 , and the other end of the intake manifold 33 is connected to and sealed with the combustion chamber of the engine 40 . The air filtered by the air filter 31 enters the combustion chamber of the engine 40 through the intake manifold 33 .

[0057] Exemplarily, the air filter 31 may be a flat filter, the air inlet end of which is disposed on the lower cover 312 and located at the bottom of the air filter 31. The air outlet end is disposed on the upper cover 311 and located at the top of the air filter 31, that is, the air flows from bottom to top for filtering.

[0058] The air intake pipe 32 includes a first end and a second end opposite to each other, wherein the first end of the air intake pipe 32 is provided with an air intake port 321, and the air intake port 321 is connected to the top longitudinal beam 11 through a mounting plate. The air intake port 321 is located at the rear side of the steering column of the all-terrain vehicle 100 along the first direction, and the air intake port 321 is located above the top longitudinal beam 11 along the second direction, that is, the air intake port 321 is located above the top of the frame 10.

[0059] The second end of the intake pipe 32 is connected to the air filter 31 through a clamp and communicates with the air filter 31. For example, the second end of the intake pipe 32 is communicated with and sealed to the intake end at the bottom of the air filter 31, so as to introduce air into the air filter 31 and filter it from bottom to top along the filter element. The filtered air can flow from the outlet end of the air filter 31 to the intake manifold 33, and further flow to the combustion chamber of the engine 40 through the intake manifold 33.

[0060] On the basis of the above-mentioned embodiment, the air intake pipe 32 in the implementation of the present application is configured as a hose, and such a configuration can facilitate the arrangement of the air intake pipe 32. Also, along the first direction, the opening direction of the air intake port 321 is set toward the rear side; or, along the second direction, the opening of the air intake port 321 is set upward. Such a configuration can prevent muddy water splashed during the driving of the all-terrain vehicle 100 from entering the air intake port 321, resulting in clogging of the filter element, thereby improving the service life and reliability of the air filter 31.

[0061] In some embodiments, in order to improve the stability of the intake flow of the engine 40, the intake system 30 provided in the embodiment of the present application also includes a throttle 34 and a pressure stabilizing chamber 35, wherein one end of the pressure stabilizing chamber 35 is connected to the intake manifold 33, and the other end of the pressure stabilizing chamber 35 is connected to the throttle 34, and the throttle 34 is arranged between the pressure stabilizing chamber 35 and the air filter 31, and the throttle 34 is connected to the outlet end of the air filter 31, and the throttle 34 is configured to control the gas flow flowing into the pressure stabilizing chamber 35.

[0062] Specifically, the pressure stabilizing chamber 35 is L-shaped as a whole, and the pressure stabilizing chamber 35 includes a bottom and a top. Along the second direction, the throttle valve 34 is arranged below the pressure stabilizing chamber 35, one side of the throttle valve 34 is connected to the air outlet end of the air filter 31, and the other side is connected to the bottom of the pressure stabilizing chamber 35, that is, the throttle valve 34 is used to connect the pressure stabilizing chamber 35 and the air outlet end of the air filter 31.

[0063] Furthermore, the top of the pressure stabilizing chamber 35 is connected to the intake manifold 33. The embodiment of the present application can control the opening of the throttle 34 to control the gas flow into the pressure stabilizing chamber 35, thereby controlling the intake flow of the engine 40. In this arrangement, the air first passes through the throttle 34, then enters the pressure stabilizing chamber 35, and enters the combustion chamber along the L-shaped trajectory through the intake manifold 33 for combustion. This arrangement can ensure the sufficiency and continuous stability of the air.

[0064] It is understandable that in the embodiment of the present application, the intake system 30 also includes an intake pressure sensor and a control module; the intake pressure sensor and the throttle valve 34 are respectively connected to the control module signal; wherein the intake pressure sensor is arranged in the pressure stabilizing chamber 35, for example, the intake pressure sensor is arranged at the top of the pressure stabilizing chamber 35.

[0065] The intake pressure sensor is configured to collect the gas pressure in the pressure stabilizing chamber 35 and transmit the collected actual pressure value to the control module. The control module has a preset pressure value, and the control module controls the opening of the throttle valve 34 according to the actual pressure value and the preset pressure value. For example, when the actual pressure value is greater than the preset pressure value, the control module can control the opening of the throttle valve 34 to decrease, otherwise, the opening of the throttle valve 34 is increased.

[0066] like Figure 4 and Figure 5 As shown, in order to optimize the layout of the air filter 31, in the embodiment of the present application, the bottom projection of the air filter 31 relative to the frame 10 is located between the two top longitudinal beams 11. In this way, the air filter 31 is located between the two top longitudinal beams 11, and the top longitudinal beams 11 can protect the air filter 31.

[0067] Furthermore, the transmission system of the all-terrain vehicle 100 provided in the implementation of the present application also includes a front half-axle and a rear half-axle; there is a first horizontal distance L1 between the air intake end of the pressure stabilizing chamber 35 and the rear half-axle, and there is a second horizontal distance L2 between the air intake end of the pressure stabilizing chamber 35 and the front half-axle; and the ratio range of the first horizontal distance L1 to the second horizontal distance L2 is 0.6-0.8.

[0068] Furthermore, there is a third horizontal distance L3 between the air inlet 321 of the air inlet pipe 32 and the air inlet end of the air filter 31, and there is a fourth horizontal distance L4 between the air inlet 321 of the air inlet pipe 32 and the front half shaft; the ratio of the fourth horizontal distance L4 to the third horizontal distance L3 is less than 0.65. With such a configuration, the air inlet system 30 can be integrated into the middle of the vehicle frame 10, increasing the strength and rigidity of the air inlet system 30, thereby improving the service life of the air inlet system 30.

[0069] The various embodiments or implementation methods in this specification are described in a progressive manner. Each embodiment focuses on the differences from other embodiments, and the same or similar parts between the various embodiments can be referenced to each other.

[0070] It should be noted that the phrases "one embodiment", "an embodiment", "an exemplary embodiment", "some embodiments", etc. mentioned in the specification indicate that the described embodiments may include certain features, structures or characteristics, but not every embodiment may include the certain features, structures or characteristics. In addition, such phrases do not necessarily refer to the same embodiment. In addition, when describing certain features, structures or characteristics in conjunction with an embodiment, it is within the knowledge of those skilled in the art to implement such features, structures or characteristics in conjunction with other embodiments, whether explicitly or not explicitly described.

[0071] In general, terms should be understood, at least in part, by the context in which they are used. For example, the term "one or more" as used herein may be used to describe any feature, structure, or characteristic in a singular sense, or may be used to describe a combination of features, structures, or characteristics in a plural sense, depending, at least in part, on the context. Similarly, terms such as "a," "an," or "the" may also be understood to convey singular usage or to convey plural usage, depending, at least in part, on the context.

[0072] It should be easily understood that “on,” “above,” and “over” in the present disclosure should be interpreted in the broadest manner, so that “on” not only means “directly on something,” but also includes the meaning of “on something” with intervening features or layers therebetween, and “above” or “over” not only includes the meaning of “above” or “over,” but also may include the meaning of “above” or “over something” with no intervening features or layers therebetween (i.e., directly on something).

[0073] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present application, rather than to limit it. Although the present application has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or replace some or all of the technical features therein with equivalents. However, these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present application.

Claims

1. An all-terrain vehicle, characterized in that: include: A frame, along a first direction, the frame includes a front space, a middle space and a rear space; A seat cushion, which is detachably mounted on the frame, with part of the seat cushion being located in the rear space and part of the seat cushion being located in the middle space; The air intake system comprises an air filter, wherein the air filter is arranged below the seat cushion along the second direction, and the seat cushion is configured to form an inspection space for the air filter after being disassembled from the vehicle frame.

2. The all-terrain vehicle according to claim 1, characterized in that: The intake system also includes an intake pipe and an intake manifold; The air intake pipe is located in the front space, and the air filter is arranged between the air intake pipe and the air intake manifold; The intake manifold is located in the rear space, and the intake manifold is communicated with an engine of the all-terrain vehicle.

3. The all-terrain vehicle according to claim 2, characterized in that: The first end of the air inlet pipe has an air inlet; The air inlet is located at the rear side of the steering column of the all-terrain vehicle along the first direction; the air inlet is located at the top of the frame along the second direction; The second end of the air intake pipe extends toward the rear side along the first direction and is communicated with the air filter.

4. The all-terrain vehicle according to claim 3, characterized in that: Along the first direction, the opening of the air inlet is arranged backward; or Along the second direction, the opening of the air inlet is arranged upward.

5. The all-terrain vehicle according to claim 3, characterized in that: The air intake pipe is configured as a hose.

6. The all-terrain vehicle according to any one of claims 2 to 5, characterized in that: The air intake system also includes a throttle valve and a pressure stabilizing chamber; One end of the pressure stabilizing chamber is communicated with the intake manifold, and the other end of the pressure stabilizing chamber is communicated with one end of the throttle valve. The other end of the throttle valve is communicated with the air outlet end of the air filter, and the throttle valve is configured to control the gas flow into the pressure stabilizing chamber.

7. The all-terrain vehicle according to claim 6, characterized in that: The pressure stabilizing chamber is L-shaped as a whole; The throttle valve is arranged below the pressure stabilizing chamber, the throttle valve is communicated with the bottom of the pressure stabilizing chamber, and the top of the pressure stabilizing chamber is communicated with the intake manifold.

8. The all-terrain vehicle according to claim 6, characterized in that: The air intake system also includes an air intake pressure sensor and a control module; The intake pressure sensor and the throttle valve are respectively connected to the control module by signal; The intake pressure sensor is disposed in the pressure stabilizing chamber, and the intake pressure sensor is configured to collect the gas pressure in the pressure stabilizing chamber and transmit the collected actual pressure value to the control module; The control module has a preset pressure value, and the control module controls the opening of the throttle valve according to the actual pressure value and the preset pressure value.

9. The all-terrain vehicle according to claim 6, characterized in that: The frame includes two top longitudinal beams extending in a first direction; The two top longitudinal beams are arranged opposite to each other along the third direction, and the bottom projection of the air filter relative to the vehicle frame is located between the two top longitudinal beams.

10. The all-terrain vehicle according to claim 6, characterized in that: The all-terrain vehicle also includes a front half-axle and a rear half-axle; There is a first horizontal distance L1 between the air inlet end of the pressure stabilizing chamber and the rear half shaft, and there is a second horizontal distance L2 between the air inlet end of the pressure stabilizing chamber and the front half shaft; The ratio of the first horizontal distance L1 to the second horizontal distance L2 is in the range of 0.6-0.8; There is a third horizontal distance L3 between the air inlet of the air inlet pipe and the air inlet end of the air filter, and there is a fourth horizontal distance L4 between the air inlet of the air inlet pipe and the front half shaft; A ratio of the fourth horizontal distance L4 to the third horizontal distance L3 is less than 0.65.

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