Motor tricycle

Abstract

To provide a motor tricycle capable of achieving high stability and safety in driving of a motor tricycle without increasing manufacturing cost and weight.SOLUTION: A motor tricycle (1) includes a pair of left and right front wheels (11) and a single rear wheel (12). The motor tricycle is provided with: a base frame (15) constituting a skeleton of a vehicle body lower side; a pair of left and right side frames (31) constituting a skeleton of a vehicle body lateral side; and a seat (41) arranged between the pair of left and right side frames. The pair of left and right side frames overhang most outward in a vehicle width direction laterally of the seat in a vehicle top view, and an outmost overhang part (39) in the vehicle width direction of the pair of left and right side frames in a vehicle side view is positioned more downward than a top end of the front wheel or the rear wheel.SELECTED DRAWING: Figure 2

Description

[Technical Field]

[0001] The present invention relates to a motor tricycle. [Background technology]

[0002] There are two-front-wheel motor tricycles that can turn by tilting the body. A two-front-wheel motor tricycle has a pair of front wheels (left and right) and a single rear wheel. One such motor tricycle is equipped with a cabin that separates the riding space (see Patent Document 1). The motor tricycle described in Patent Document 1 has various covers supported on its body frame, and the cabin is formed by side covers that cover the driver's seat from the sides and an upper cover that covers the driver's seat from above. Providing a cabin on a motor tricycle improves the vehicle's safety in the event of a side collision. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] International Publication No. 2021 / 039991 Summary of the Invention [Problem to be solved by the invention]

[0004] However, cabins are not a good match for small vehicles like tricycles. For example, adding a cabin to a tricycle increases manufacturing costs and weight, and the cabin raises the center of gravity of the tricycle, reducing its lateral stability. There's also the risk of the driver being trapped inside the cabin in the event of a collision. Furthermore, in small vehicles, the driver's line of sight tends to be lowered, limiting their field of vision, and adding a cabin to a small vehicle further limits that field of vision.

[0005] The present invention has been made in consideration of the above points, and has as its object to provide a three-wheeled motor vehicle that can improve stability during driving and vehicle safety without increasing manufacturing costs or weight. [Means for solving the problem]

[0006] One aspect of the present invention is a three-wheeled motor vehicle equipped with a pair of left and right front wheels and a single rear wheel, the three-wheeled motor vehicle comprising a base frame forming a skeleton on the underside of the vehicle body, a pair of left and right side frames forming a skeleton on the sides of the vehicle body, and a seat disposed between the pair of left and right side frames, wherein the pair of left and right side frames protrude most outward in the vehicle width direction on the sides of the seat when viewed from above the vehicle, and the most outward protruding portion of the pair of left and right side frames in the vehicle width direction is positioned below the upper end of the front wheels or the rear wheels when viewed from the side of the vehicle. A fuel tank is disposed below the seat and inside the base frame, a portion of the fuel tank overlaps the base frame in a side view of the vehicle, and a fuel filler opening on the top of the fuel tank extends forward of the seat. This solves the above problem. [Effects of the Invention]

[0007] According to one aspect of the motor tricycle of the present invention, the side frames extend outward in the vehicle width direction to form a buffer against side collisions. The protruding portions of the side frames are positioned lower than the upper ends of the front or rear wheels, improving driver safety in side collisions without raising the vehicle's center of gravity. The reduced height of the side frames on the sides of the seat makes it less likely that the driver will be left behind inside the vehicle in the event of a collision. Because additional components such as a cabin are not required, manufacturing costs and weight are reduced, and visibility is not excessively restricted. [Brief explanation of the drawings]

[0008] [Figure 1] FIG. 1 is a perspective view of a motor tricycle according to an embodiment of the present invention. [Figure 2] FIG. 1 is a left side view of the motor tricycle of the present embodiment. [Figure 3] FIG. 2 is a side view of the rear portion of the vehicle according to the present embodiment. [Figure 4] FIG. 1 is a top view of the motor tricycle of the present embodiment. DETAILED DESCRIPTION OF THE INVENTION

[0009] A motor tricycle according to one aspect of the present invention includes a pair of left and right front wheels and a single rear wheel. The lower body framework of the motor tricycle is formed by a base frame, and the lateral body framework of the motor tricycle is formed by a pair of left and right side frames. A seat is disposed between the pair of left and right side frames, and the pair of left and right side frames protrude most outward in the vehicle width direction on the sides of the seat when viewed from above the vehicle, forming a buffer material against a side collision. When viewed from the side of the vehicle, the most outwardly protruding portion of the pair of left and right side frames is positioned outward in the vehicle width direction at a position lower than the upper end of the front or rear wheel, thereby improving driver safety in a side collision without raising the center of gravity of the vehicle. The reduced height of the side frames makes it less likely that the driver will be left behind inside the vehicle during a collision. Since additional components such as a cabin are not required, manufacturing costs and weight are reduced, and visibility is not excessively restricted. [Example]

[0010] This embodiment will be described in detail below with reference to the accompanying drawings. Fig. 1 is a perspective view of the motor tricycle of this embodiment. Fig. 2 is a left side view of the motor tricycle of this embodiment. In the following figures, arrow FR indicates the front of the vehicle, arrow RE indicates the rear of the vehicle, arrow L indicates the left side of the vehicle, and arrow R indicates the right side of the vehicle. In this embodiment, the outer diameters of the front and rear wheels are the same.

[0011] As shown in Figures 1 and 2, motor tricycle 1 is a two-wheel vehicle with a pair of left and right front wheels 11 and a single rear wheel 12. The body frame 13 of motor tricycle 1 has a base frame 15 on the underside of the body, a front frame 21 on the front side of the body, and a pair of left and right side frames 31 on the sides of the body. The base frame 15 forms the skeleton of the underside of the body, the front frame 21 forms the skeleton of the front side of the body, and the pair of left and right side frames 31 form the skeleton of the lateral side of the body. Exterior parts such as cowls and covers (not shown) are attached to the base frame 15, the front frame 21, and the pair of left and right side frames 31.

[0012] The base frame 15 is formed in a ladder shape by a pair of left and right main rails 16 extending in the longitudinal direction of the vehicle and a plurality of cross pipes 17 connecting the pair of left and right main rails 16. The front frame 21 is formed in a box shape by pipes, plates, etc. A pair of left and right suspension arms 22 are supported by the front frame 21 so as to be able to swing. Each suspension arm 22 extends outward in the vehicle width direction, and a front wheel 11 is rotatably supported at the tip of each suspension arm 22. The suspension arms 22 are connected to the front frame 21 via front suspensions 24.

[0013] An arch-shaped steering frame 23 is provided on the front frame 21, and a steering shaft 25 is steerably supported on the steering frame 23. A handle 26 is joined to the upper end of the steering shaft 25, and a steering device 27 is connected to the lower end of the steering shaft 25. A pair of left and right front wheels 11 are connected to the steering device 27, and the operating force of the handle 26 is transmitted to each front wheel 11 via the steering device 27. When the handle 26 is operated left or right, each front wheel 11 is steered left or right by the steering device 27, and a turning force is generated in the vehicle body while each front wheel 11 is maintained approximately perpendicular to the road surface.

[0014] The side frames 31 are formed in a triangular shape with the main rails 16 as the base, and are made up of a main pipe 32 extending diagonally upward from the front end of the main rails 16 toward the rear of the vehicle, and a rear pipe 33 extending diagonally upward from the rear end of the main rails 16 toward the rear end of the main pipe 32. The main rails 16 and main pipes 32 are connected by a plurality of reinforcing frames 34a-34c so that the side frames 31 have a truss structure. A plate-shaped seat 41 is disposed inside the pair of left and right side frames 31. An arch-shaped back frame 36 is provided at the rear of the main pipe 32, and a backrest (not shown) is attached to the back frame 36.

[0015] In this way, the driver's seat is formed inside the pair of left and right side frames 31. The driver's seat extends from the seat 41 to near the front wheels 11, allowing the driver to stretch his / her legs and assume a low riding position. The width of the base frame 15 is about that of a single driver, but the distance between the pair of left and right main pipes 32 is wider than the width of the base frame 15 and is formed largest on the sides of the seat 41 on which the driver sits. In addition, the driver's seat 41 is positioned higher than the base frame 15, and heavy objects such as a fuel tank 45 and a battery 47 are placed in the space below the seat 41.

[0016] An engine 51 is swingably supported at the rear end of the base frame 15 via a suspension bracket 48. A unit swing engine is used as the engine 51, with a cylinder assembly 53 disposed in front of a crankcase 52. The left side of the crankcase 52 extends rearward, and the rear wheel 12 is rotatably supported at the rear end of the crankcase 52. A CVT cover 55 is attached to the open left side of the crankcase 52. A belt-type continuously variable transmission (not shown) is housed inside the CVT cover 55, and the driving force of the engine 51 is transmitted to the rear wheel 12 via the belt.

[0017] A magneto cover 56 (see Figure 4) is attached to the open right side of the crankcase 52. A magneto is housed inside the magneto cover 56, and ignition voltage is supplied to the ignition device by the magneto. A muffler 57 is connected to the cylinder assembly 53 via an exhaust pipe (not shown), and the muffler 57 is positioned on the right side of the rear wheel 12. The rear ends of the pair of left and right side frames 31 are connected via a bridge pipe 37, and the left rear end of the crankcase 52 is connected to this bridge pipe 37 via a rear suspension 58 that absorbs impacts to the body frame 13.

[0018] As described above, the rear wheel 12 is supported at the rear end of the crankcase 52, and the rear wheel 12 tilts together with the vehicle body in conjunction with the operation of the steering device 27, causing the vehicle body to turn. At this time, a low center of gravity of the vehicle body is required to improve stability in the vehicle width direction and turning ability. Furthermore, in small vehicles such as the motor tricycle 1, damage in the event of a collision differs from that of a normal four-wheeled vehicle, and it is not necessarily safer for the driver to be completely surrounded by a frame as in a four-wheeled vehicle. Generally, in small vehicles, safety is ensured by not surrounding the driver with a frame so that the driver is not left behind in the driver's seat in the event of a collision.

[0019] Therefore, in the motor tricycle 1 of this embodiment, a pair of left and right side frames 31 protrude outward in the vehicle width direction on either side of the seat 41 when viewed from above the vehicle, and the height of the pair of left and right side frames 31 is kept low so that the upper half of the driver's body is exposed when viewed from the side of the vehicle. By having the side frames 31 protrude outward on the sides of the seat 41, buffer material is formed against a side collision, ensuring the safety of the driver in a side collision without raising the center of gravity of the motor tricycle 1. Furthermore, by keeping the height of the side frames 31 low, the driver is prevented from being left behind in the driver's seat in the event of a collision.

[0020] The detailed configuration of the side frame will be described with reference to Figures 3 and 4. Figure 3 is a side view of the rear part of the vehicle of this embodiment. Figure 4 is a top view of the motor tricycle of this embodiment.

[0021] As shown in Figures 3 and 4, an engine 51 is supported on the rear of the base frame 15. A cylinder assembly 53 of the engine 51 is formed by assembling a cylinder (not shown), a cylinder head (not shown), and a cylinder head cover 54, and covering the cylinder and cylinder head with an engine cover 49. The cylinder axis direction of the cylinder assembly 53 faces diagonally upward, and the crankcase 52 connected to the cylinder assembly 53 is disposed approximately horizontally. The cylinder assembly 53 faces forward, thereby achieving a low center of gravity of the engine 51.

[0022] A pair of left and right seat pipes 35 extend forward from the rear pipes 33 on both sides of the cylinder assembly 53. The front ends of each seat pipe 35 are connected to cross pipes 38 that connect the reinforcing frames 34b. The seat pipes 35 support both side edges of the seat 41 in the vehicle width direction from below, and the seat 41 is positioned approximately in the center of the vehicle in a top view of the vehicle. In a side view of the vehicle, the seating surface 42 of the seat 41 is positioned below the upper ends of the rear wheels 12, thereby achieving a low center of gravity of the vehicle body. Furthermore, because the seat 41 is positioned in front of the cylinder assembly 53, the height of the seat 41 is not restricted by the position or swing of the engine 51.

[0023] A fuel tank 45 and a battery 47 are disposed below the seat 41 and inside the pair of left and right main rails 16. When viewed from the side of the vehicle, the fuel tank 45 and the battery 47 overlap the main rails 16, so that the fuel tank 45 and the battery 47, which are vulnerable to impacts, are protected by the main rails 16. Furthermore, by positioning the fuel tank 45 and the battery 47, which are heavy objects, in the lower part of the vehicle body, a low center of gravity of the vehicle is achieved. Furthermore, a fuel filler opening 46 on the top of the fuel tank 45 extends forward of the seat 41. Therefore, the seat 41 is brought closer to the top surface of the fuel tank 45, and the height of the seat surface 42 of the seat 41 can be kept low.

[0024] When viewed from above the vehicle, the pair of left and right side frames 31 protrude most outward in the vehicle width direction on the sides of the seat 41, forming protruding portions 39. More specifically, the distance between the pair of left and right main pipes 32 increases from the front end of the main rail 16 toward a lateral position P1 of the seat 41, and the distance between the pair of left and right main pipes 32 decreases from the lateral position P1 of the seat 41 toward the upper end of the rear pipe 33. The protruding portions 39 of the main pipes 32 are bent at the lateral position P1 of the seat 41, making it difficult for the protruding portions 39 to deform inward in the vehicle width direction during a side collision. Furthermore, the distance between the protruding portions 39 from the seat 41 improves driver safety in a side collision.

[0025] Two reinforcing frames 34a, 34b extend from the main rail 16 of the base frame 15 toward the protruding portion 39 of the main pipe 32 of the side frame 31. The lower ends of the two reinforcing frames 34a, 34b are joined to two locations spaced apart at the front and rear of the main rail 16, and the upper ends of the two reinforcing frames 34a, 34b are joined to the protruding portion 39 of the main pipe 32. A truss structure is formed by the main rail 16 and the two reinforcing frames 34a, 34b, improving the strength of the side frame 31, which functions as a buffer material. The increased strength of the side frame 31 against downward loads allows the side frame 31 to function as a handrail when getting on and off the car.

[0026] In a side view of the vehicle, the overhanging portion 39 of the main pipe 32 that is outermost in the vehicle width direction is positioned lower than the upper end of the rear wheel 12. In addition, in a side view of the vehicle, portions of the two reinforcing frames 34a, 34b overlap the seat 41, and the two reinforcing frames 34a, 34b are joined to the overhanging portion 39 of the main pipe 32 below the upper end of the rear wheel 12. Because the overhanging portion 39 of the main pipe 32 is positioned lower than the upper end of the rear wheel 12, the strength of the side frame 31 is increased by the overhanging portion 39 without raising the center of gravity of the vehicle. By reducing the height of the main pipe 32 on the side of the seat 41, it is less likely that the driver will be left inside the vehicle in the event of a collision.

[0027] Furthermore, the main pipe 32 and rear pipe 33 of the side frame 31 are connected behind the seat 41. In a side view of the vehicle, the connection portion 40 between the main pipe 32 and the rear pipe 33 is located above the rear wheel 12 and below the handlebars 26 (see FIG. 2). The height of the side frame 31 at the rear of the vehicle is also kept low, lowering the overall vehicle height and achieving a lower center of gravity of the vehicle. The height of the overhanging portion 39 only needs to be above the seating surface 42 of the seat 41 and below the upper end of the rear wheel 12. In particular, it is preferable that the overhanging portion 39 be positioned to the side of the driver's buttocks.

[0028] In a top view of the vehicle, the main pipes 32 of the side frames 31 extend toward the rear of the vehicle, passing outside the main rails 16 of the base frame 15 in the vehicle width direction. In this case, the distance between the front ends of the pair of left and right main pipes 32 is the same as the distance between the pair of left and right main rails 16, and the distance between the front ends of the pair of left and right main pipes 32, i.e., the distance between the pair of left and right rear pipes 33, is the same as the distance between the pair of left and right main rails 16. Therefore, even if the main pipes 32 extend outward in the vehicle width direction to form a buffer material, it is possible to minimize an increase in vehicle width and weight. In addition, the space between the seat 41 and the main pipes 32 can be used as a footrest for passengers.

[0029] As described above, according to this embodiment, the side frames 31 protrude outward in the vehicle width direction, thereby forming a buffer material against side collisions. Because the protruding portions 39 of the side frames 31 are positioned lower than the upper ends of the rear wheels 12, driver safety in a side collision is improved without raising the center of gravity of the vehicle. Because the height of the side frames 31 is kept low on the sides of the seat 41, the driver is less likely to be left behind inside the vehicle in the event of a collision. Because there is no need to add parts such as a cabin, increases in manufacturing costs and weight are kept low, and visibility is not excessively narrowed.

[0030] In this embodiment, a unit swing engine is used as an example of the engine, but the engine is not limited to a unit swing engine. The cylinder axis of the cylinder assembly of the engine does not have to face forward, and the cylinder axis of the cylinder assembly of the engine may face upward.

[0031] Furthermore, although an engine is used as the prime mover in this embodiment, a motor may also be used as the prime mover. When a motor is used as the prime mover, a swing arm is swingably supported at the rear of the body frame, and a rear wheel is rotatably supported at the rear end of the swing arm. The motor may be provided on the body frame, or the motor may be provided on the swing arm.

[0032] In this embodiment, the front and rear wheels have substantially the same outer diameter, but the front and rear wheels may have different outer diameters. If the front and rear wheels have different outer diameters, the protruding portions of the side frames may be positioned below the upper ends of at least one of the front and rear wheels.

[0033] Furthermore, in this embodiment, the seat is fixed to the body frame, but the seat may be attached to the body frame so that the height of the seat is adjustable.

[0034] In addition, in this embodiment, the driver's seat is formed so that the driver's legs are stretched forward, but the driver's seat may be formed as a saddle type.

[0035] In addition, in this embodiment, two reinforcing frames are joined to the protruding portion of the side frame, but the two reinforcing frames may also be joined to a single location away from the protruding portion of the side frame as long as it is below the upper end of the front or rear wheel.

[0036] In addition, in this embodiment, the connection between the main pipe and the rear pipe is located behind the seat and below the handlebars, but the location of the connection between the main pipe and the rear pipe is not particularly limited. For example, the connection between the main pipe and the rear pipe may be located behind the seat and above the handlebars.

[0037] In addition, in this embodiment, the side frames are formed in a triangular shape when viewed from the side, but the shape of the side frames is not particularly limited as long as the side frames protrude most outward in the vehicle width direction on the sides of the seats when viewed from above the vehicle.

[0038] In addition, in this embodiment, the sheet is formed in a plate shape, but the shape of the sheet is not particularly limited.

[0039] Furthermore, a cylinder assembly may be any assembly made up of multiple parts, including at least a cylinder head. For example, in an engine in which the cylinder is integrated into the crankcase, the cylinder assembly may be the assembly of the cylinder head and cylinder head cover.

[0040] As described above, the motor tricycle (1) of this embodiment is a motor tricycle equipped with a pair of front wheels (11) and a single rear wheel (12). The tricycle includes a base frame (15) that forms the underside of the vehicle body, a pair of side frames (31) that form the lateral side frames, and a seat (41) disposed between the pair of side frames. In a top view of the vehicle, the pair of side frames protrude most outward in the vehicle width direction on the sides of the seat. In a side view of the vehicle, the most outwardly extending protrusions (39) of the pair of side frames are positioned below the top ends of the front or rear wheels. This configuration provides a buffer against side collisions by the side frames protruding outward in the vehicle width direction. Positioning the protruding portions of the side frames below the top ends of the front or rear wheels improves driver safety in a side collision without raising the vehicle's center of gravity. The reduced height of the side frames on the sides of the seat reduces the likelihood of the driver being left behind inside the vehicle during a collision. Since there is no need to add parts such as a cabin, manufacturing costs and weight increases are reduced and visibility is not excessively restricted.

[0041] The tricycle of this embodiment includes two reinforcing frames (34a, 34b) extending from a base frame to a pair of left and right side frames. The lower ends of the two reinforcing frames are joined to the base frame at two separate locations on the front and rear of the base frame on both the left and right sides of the vehicle, and the upper ends of the two reinforcing frames are joined to one location on the side frame, forming a triangle between the base frame and the two reinforcing frames. In a side view of the vehicle, portions of the two reinforcing frames overlap the seat, and the upper ends of the two reinforcing frames are joined to the side frame below the upper ends of the front or rear wheels. This configuration forms a truss structure between the base frame and the two reinforcing frames. Because the two reinforcing frames are joined to the side frame below the upper ends of the front or rear wheels, the strength of the side frame is improved without raising the center of gravity of the vehicle. The side frame also has sufficient strength when used as a handrail when getting on and off the vehicle.

[0042] In the three-wheeled motor vehicle of this embodiment, the upper ends of the two reinforcing frames are joined to the protruding portions. This configuration improves the strength of the protruding portions of the side frames, further enhancing the safety of the driver in the event of a side collision.

[0043] In the tricycle of this embodiment, the pair of left and right side frames includes a pair of left and right main pipes (32) extending diagonally upward from the front end of the base frame toward the rear of the vehicle, and a pair of left and right rear pipes (33) extending diagonally upward from the rear end of the base frame toward the rear ends of the pair of left and right main pipes, with the connection portions (40) between the pair of left and right main pipes and the pair of left and right rear pipes being located behind the seat and below the handlebars. With this configuration, the main pipes, rear pipes, and base frame form a triangle, increasing the strength of the side frames. The height of the side frames is also reduced at the rear of the vehicle, lowering the overall vehicle height and achieving a lower center of gravity.

[0044] In the three-wheeled motor vehicle of this embodiment, the pair of left and right main pipes extend rearward of the vehicle widthwise outside the base frame, and the distance between the pair of left and right rear pipes is the same as the width of the base frame. With this configuration, even if the main pipes extend outward in the vehicle width direction to form shock absorbers, the increase in vehicle width and weight can be kept to a minimum.

[0045] In the three-wheeled motor vehicle of this embodiment, the fuel tank (45) is disposed below the seat and inside the base frame, and a portion of the fuel tank overlaps the base frame in a side view of the vehicle. With this configuration, the fuel tank, which is vulnerable to impacts, can be protected by the base frame.

[0046] Although the present embodiment has been described, other embodiments may be made by combining the above-described embodiments and modifications in whole or in part.

[0047] Furthermore, the technology of the present invention is not limited to the above-described embodiments, and various changes, substitutions, and modifications may be made without departing from the spirit of the technical idea. Furthermore, if the technical idea can be realized in a different way due to technological advances or other derived technologies, it may be implemented using that method. Therefore, the claims cover all embodiments that may fall within the scope of the technical idea. [Explanation of symbols]

[0048] 1: Tricycle 11: Front wheel 12: Rear wheel 15: Base frame 26: Handle 31: Side frame 32: Main pipe 33: Rear pipe 34a, 34b: Reinforcement frame 39: Overhang 40: Connection part 41: Sheet 45: Fuel tank

Claims

1. A motor tricycle having a pair of left and right front wheels and a single rear wheel, A base frame that forms the skeleton of the lower side of the vehicle body; A pair of left and right side frames that form the framework of the vehicle body sides; a seat disposed between the pair of left and right side frames, When viewed from above the vehicle, the pair of left and right side frames protrude most outward in the vehicle width direction on the sides of the seat, When viewed from the side of the vehicle, the outermost protruding portion of the pair of left and right side frames in the vehicle width direction is positioned lower than an upper end of the front wheel or the rear wheel, a fuel tank is disposed below the seat and inside the base frame, a portion of the fuel tank overlaps the base frame in a side view of the vehicle, and a fuel filler port on an upper part of the fuel tank extends forward of the seat.

2. two reinforcing frames on each side extending from the base frame to the pair of left and right side frames; On both the left and right sides of the vehicle, lower ends of the two reinforcement frames are joined to two locations spaced apart from each other at the front and rear of the base frame, and upper ends of the two reinforcement frames are joined to one location of the side frame, so that a triangle is formed by the base frame and the two reinforcement frames, 2. The three-wheeled motor vehicle according to claim 1, wherein a portion of the two reinforcing frames overlaps the seat in a side view of the vehicle, and upper ends of the two reinforcing frames are joined to the side frames below an upper end of the front wheel or an upper end of the rear wheel.

3. 3. The three-wheeled motor vehicle according to claim 2, wherein upper ends of the two reinforcing frames are joined to the protruding portion.

4. the pair of left and right side frames include a pair of left and right main pipes extending obliquely upward from a front end of the base frame toward the rear of the vehicle, and a pair of left and right rear pipes extending obliquely upward from a rear end of the base frame toward rear ends of the pair of left and right main pipes, 4. The motor tricycle according to claim 1, wherein the connection portions of the pair of left and right main pipes and the pair of left and right rear pipes are located rearward of the seat and below the handlebars.

5. 5. The three-wheeled motor vehicle according to claim 4, wherein the pair of left and right main pipes extend rearward of the vehicle, passing outside the base frame in the vehicle width direction, and the distance between the pair of left and right rear pipes is the same as the width of the base frame.

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