JP5204068B2 - Motorcycle - Google Patents

Description

  The present invention relates to a motorcycle, for example, a so-called sports moped type motorcycle having an underbone frame structure.

  Conventionally, in a so-called sports moped motorcycle equipped with an underbone frame structure, an engine and an air cleaner are arranged at the front of the vehicle body, and a fuel tank is arranged below the seat. According to this arrangement, the space below the seat and around the engine is limited, so that it is difficult to secure a sufficient capacity of the portable article storage unit, and the capacity of the fuel tank and the air cleaner is also limited. Further, if the seat width is increased in order to increase the capacity of the storage section, the sporty appearance is impaired, and the rider's footwear is also deteriorated. Therefore, a horizontal engine is used, an air cleaner is placed in the space above the vacant engine, and a fuel tank is provided under the passenger seat, near the head pipe, or between the head pipe and the seat to store the portable goods. Some have increased the capacity of the air cleaner (for example, Patent Document 1).

Japanese Patent Laid-Open No. 2004-243958

  However, in the motorcycle disclosed in Patent Document 1, the capacities of the portable article storage unit and the air cleaner are increased to some extent, but the capacity of the fuel tank is limited by the head pipe or the main frame, and is not sufficient.

  The present invention has been made in view of the above problems, and it is an object of the present invention to provide a motorcycle that can secure the capacity of an article storage unit and increase the capacity of a fuel tank and an air cleaner without increasing the seat width. It is said.

To achieve the above object, a motorcycle according to the present invention includes a main frame extending rearward and downward from a head pipe that rotatably supports a steering shaft, and an upper side of the main frame between the head pipe and a seat. And a fuel tank having a rear end portion extending below the seat, an air cleaner located below the main frame, and an engine located below the fuel tank, and a case of the air cleaner Is located in front of the front end of the fuel tank.

  According to this configuration, the fuel tank is disposed in the wide space above the main frame extending downward and the air cleaner is disposed in the wide space below the main frame. Therefore, without increasing the seat width, the fuel tank and The capacity of the air cleaner can be increased, and a large space can be secured under the seat, which can be used, for example, for storing portable items. Further, since the fuel tank is on the upper side of the main frame, the refueling operation can be easily performed.

In the present invention, it is preferable to further include a tank cover that covers the fuel tank, and a step-through cover that forms a recess between the tank cover and the seat .

When the step-through cover is provided, it is preferable that an upper edge portion of the step-through cover is positioned below a lower edge of the sheet.

In the present invention, it is preferable that the fuel tank and the air cleaner are arranged so as not to overlap in a side view.

  In the present invention, it is preferable that a rear wheel cushioning device facing in the front-rear direction is further provided below the seat. Here, “front-rear direction” means ± 10 ° or less, preferably ± 5 ° or less in the left-right direction with respect to the vertical center plane extending in the front-rear direction of the vehicle body, and the vertical direction with respect to the horizontal plane. In the range of ± 45 ° or less, preferably ± 30 ° or less, and more preferably ± 20 ° or less. According to this configuration, since a single rear wheel shock absorber can be arranged in a large space under the seat to be a so-called single shock type, the seat rail and the swing arm are arranged on both sides of the rear wheel. Compared to the so-called two-shock type with one rear wheel shock absorber in between, the lateral distance between the seat rails can be reduced, resulting in a smaller seat width and a sporty shape. The leg's ability to reach is also improved.

  In the present invention, it is preferable that the engine is set forward. According to this configuration, since the air cleaner can be disposed in a large space below the main frame obtained by facing the engine forward, the capacity of the air cleaner can be further increased. Here, “forward” refers to an angle of ± 45 ° or less, preferably ± 30 ° or less, more preferably ± 15 ° or less, in a horizontal plane from the engine rotation axis extending in the left-right direction to the front. It means extending.

  In the present invention, it is preferable that the front surface of the case of the air cleaner is located above the front side of the engine. According to this configuration, since the traveling wind can be smoothly guided to the engine by the front surface of the case of the air cleaner, high air cooling performance can be maintained.

  In the present invention, it is preferable that a portable product storage section is further provided under the seat. As described above, since the fuel tank and the air cleaner are arranged on the upper side and the lower side of the main frame, a large space is generated under the seat, so that the volume of the portable product storage unit arranged here can be increased.

  According to the motorcycle of the present invention, the fuel tank is arranged in the wide space above the main frame extending downward and the air cleaner is arranged in the wide space below the main frame, so without increasing the seat width, The capacity of the fuel tank and air cleaner can be increased, and a large space can be secured under the seat, which can be used, for example, for storing portable items.

1 is a side view showing a motorcycle according to a first embodiment of the present invention. It is a perspective view which shows a motorcycle same as the above. Fig. 3 is an enlarged side view showing the periphery of a rear wheel shock absorber of the motorcycle. Fig. 3 is a plan view showing the vicinity of the seat of the motorcycle. (A) is a schematic side view which shows arrangement | positioning of the conventional rear wheel shock absorber, (b) is a schematic side view which shows arrangement | positioning of the rear wheel shock absorber of 1st Embodiment.

Hereinafter, preferred embodiments of the present invention will be described with reference to the drawings.
FIG. 1 is a side view showing a moped motorcycle according to a first embodiment of the present invention. In the figure, a head pipe 2 is attached to a front end portion of a main frame 1 that is rearwardly lowered constituting the front half of a vehicle body frame FR, and a steering shaft (not shown) that is rotatably inserted into the head pipe 2 is provided. Thus, the upper bracket 4 and the lower bracket 7 are supported, and a front fork 8 is supported by the upper bracket 4 and the lower bracket 7, whereby the front fork 8 is supported by the head pipe 2 so as to be freely steerable. . A front wheel 9 is supported on the lower end portion of the front fork 8, and a front fender 24 covering the front wheel 9 is attached. A handle 10 is attached to the upper bracket 4 at the upper end of the front fork 8.

  A swing arm bracket 11 is provided below the rear end portion of the main frame 1, and a swing arm 12 is supported on the swing arm brat 11 via a pivot shaft 13 at the front end portion so as to be swingable up and down. A rear wheel 14 is supported at the rear end of the swing arm 12. An engine E is supported between the front wheel 9 and the rear wheel 14 at a substantially central lower portion of the main frame 1. The engine E is a forward-facing engine in which a cylinder axis extends in a substantially horizontal direction from the engine rotation axis toward the front of the vehicle body. A pair of left and right rear frames 17 connected to the rear portion of the main frame 1 constitute the rear half of the vehicle body frame FR, and a single seat 18 is supported on the rear frame 17. A fuel tank 19 is disposed on the upper side of the main frame 1 between the head pipe 2 and the seat 18, and a rear end portion 19 a of the fuel tank 19 is located below the front portion 18 a of the seat 18. A headlamp unit 20 is supported on the upper bracket 4 and the lower bracket 7.

  A case of an air cleaner AC (hereinafter referred to as “cleaner case”) 15 is disposed in a large space between a cylinder head EH that forms the top of the forward-facing engine E and the main frame 1 thereabove, with the front facing obliquely downward. Placed in a different posture. A carburetor 16 that is a fuel supply device is disposed behind the cleaner case 15 and connected between the cleaner case 15 and the engine E. An air inlet (not shown) for the air cleaner AC is provided on the rear surface of the cleaner case 15. The cleaner case 15 and the fuel tank 19 are attached to the main frame 1, and are respectively located on the lower side and the upper side of the main frame 1, and the front end 15 p of the cleaner case 15 is located forward of the front end 19 p of the fuel tank 19. Yes. Here, a part of the fuel tank 19 or the air cleaner AC may be arranged so as to overlap the main frame 1 or to protrude to the opposite side in the vertical direction beyond the main frame 1 in a side view. Further, the cleaner case 15 or the fuel tank 19 may be located on the lower side and the upper side away from the main frame 1.

  The vehicle body frame FR also includes a tank cover 41 that covers the fuel tank 19, a step-through cover 42 that forms a recess between the tank cover 41 and the seat 18, a rear cover 43 that covers the lower portion of the seat 18, an air cleaner AC, and a cylinder head. A lower cowling 44 that covers a part of the lower part and side part of the EH from below and from the side part is attached.

  In FIG. 2 showing a front perspective view of the motorcycle, a wind guide surface 27 is formed on the front surface of the cleaner case 15. This air guide surface 27 has a shape in which a central portion 27a in the left-right direction of the vehicle body is recessed backward from both side portions 27b, and a plurality of elongated recesses 28 extending in the left-right direction of the vehicle body are formed on the air guide surface 27. It is formed for the purpose of improving the appearance and reinforcing the case wall forming the air guide surface 27. As is clear from FIG. 1, the entire air guide surface 27 is located below the main frame 1, the upper end portion 27 u is located above the front fender 24, and the lower end portion 27 d is located above the engine E. Located above. Further, the cylinder head EH is positioned on a straight extension line L that passes through the central portion 27 a in the left-right direction of the air guide surface 27 and extends downward along the air guide surface 27. As a result, the traveling air A guided by the air guide surface 27 can be efficiently guided to the cylinder head EH.

  The main frame 1 has a rear-lowering shape, whereas the rear frame 17 has a rear-upward shape. That is, as shown in FIG. 3, the rear frame 17 has a pair of rear left and right seat rails 17a that support the seat 18 (FIG. 1), and a rear upward support member 17b that reinforces the seat rail 17a. ing. The front end portion 17aa of the seat rail 17a is connected to a substantially central portion in the front-rear direction of the main frame 1. The support member 17b has a front end portion 17ba connected to the swing arm bracket 11, and a rear end portion 17bb connected to the front and rear sides of the seat rail 17a. It is connected to a portion slightly rearward of the central portion in the direction. Thereby, a triangular space S is formed between the main frame 1, the seat rail 17a, and the support member 17b in a side view. The main frame 1 is not limited to a single type, and various types of main frames such as a type having a pair of left and right frame pieces branched in a bifurcated shape can be used.

  The upper edge portion of the step-through cover 42 in FIG. 1, that is, the upper edge portion of the vehicle body in front of the seat 18, is positioned below the lower edge of the seat 18, and the recess 25 is connected to the lower edge of the seat 18. It has become. Here, “body” refers to the basic structural parts of a motorcycle, except for the engine, power transmission mechanism and optional parts, which are the body frame, suspension system, steering system, tire / wheel system, seat and fuel tank. The part to include.

  In addition, the seat 18 is supported by the vehicle body frame FR so as to be vertically rotatable via a support shaft 26 that is disposed at the front end portion and extends in the left-right direction. When the sheet 18 is opened as indicated by a two-dot chain line, the front end of the sheet 18 enters the recess 25, so that the sheet 18 is smoothly opened.

  A portable product storage unit 30 is provided inside the step-through cover 42 and the rear cover 43 below the seat 18, and a battery 31 is disposed behind the portable product storage unit 30. The portable product storage unit 30 is formed by a resin box opened upward. In the present embodiment, the portable article storage unit 30 also serves as a tool holder, but a tool holder may be provided separately behind the battery 31 or between the seat 18 and the battery 31. As shown in FIG. 4, which is a plan view of the seat 18, the portable product storage portion 30 extends from the front portion 18 a of the seat 18 to slightly behind the portion 18 b having the maximum lateral width M in the seat 18 in plan view. The length L in the front-rear direction is larger than the maximum width W in the horizontal direction. Thereby, sufficient volume of the portable goods storage part 30 is securable, making sheet width small. Since the portable product storage unit 30 is below the seat 18 and is not visible in a plan view, in FIG. 4, it is shown by a solid line for clarity of the structure. Further, the front end portion 30 a of the portable product storage unit 30 is located below the front portion 18 a of the seat 18. Accordingly, the seat rail 17a in FIG. 3 is raised rearward, that is, forwardly lowered, so that the lower portion of the front portion 18a of the seat 18 having a large space is effectively used to increase the depth of the portable article storage portion 30 and increase the volume. Can be bigger.

  Below the seat 18 shown in FIG. 1, a single-type rear wheel shock absorber 21 in the front-rear direction is disposed. More specifically, the rear wheel shock absorber 21 is located below the portable article storage unit 30 and between the pair of left and right seat rails 17a, 17a and support members 17b, 17b, as shown in FIG. Most of the portion excluding the front end portion 21a is located in a triangular space S formed by the main frame 1, the seat rail 17a, and the support member 17b in a side view. Further, in this embodiment, the rear wheel shock absorber 21 is inclined about 12 ° forward and upward from the horizontal plane, but it is not always necessary to be at this angle, and may not be oriented in the front-rear direction. The front end portion 21a of the rear wheel shock absorber 21 is positioned between the front end portions of the pair of left and right rear frames 17, 17, and is attached to a front bracket 33 provided on the main frame 1 via fastening means 32 such as bolts. And is pivotally attached. The rear end 21b is rotatably attached to a rear bracket 34 protruding upward from the swing arm 12 via a fastening means 32 such as a bolt. As is clear from FIG. 4, the engine E, the fuel tank 19, the air cleaner AC, and the rear wheel shock absorber 21 are all installed at the center in the left-right direction of the vehicle body. The axial center of the rear wheel shock absorber 21 is located on a vertical center plane PL extending in the front-rear direction of the vehicle body, and is not substantially inclined with respect to the center plane PL.

  As described above, since the seat 18 is supported by the pair of left and right seat rails 17a and 17a, the width of the seat 18 is determined by the interval between the pair of seat rails 17a and 17a. As shown in FIG. 5 (a), in a conventional motorcycle employing a two-type rear wheel shock absorber 51, each of the left and right rear wheel shock absorbers 51 includes a pair of left and right seat rails 53 and a swing arm. 54 is connected and supported. Therefore, in order to prevent interference with parts around the seat rail 53 and the rear wheel 55, the rear wheel shock absorber 51 needs to be disposed closer to the outer side of the vehicle body. Thereby, the space | interval of the right and left of a pair of rear frame 53 which supports the upper end part of the rear-wheel buffer device 51 becomes wide, and a seat width also becomes wide.

  Therefore, as shown by a two-dot chain line in FIG. 5A, a so-called single shock type is adopted, and one vertical shock absorber 51A in the vertical direction is provided at the center in the horizontal direction of the vehicle body. Conceivable. In that case, if the engine 57 is vertically oriented, the lever ratio of the swing arm 59 can be set to a required size. Here, the lever ratio refers to the distance a between the axis of the pivot shaft 63 and the axis of the rear wheel 55, and the distance between the axis of the pivot shaft 63 and the connecting axis of the rear wheel shock absorber 51A in the swing arm 54. When b1, it is represented by b1 / a. However, when the engine 57 is directed forward as indicated by a two-dot chain line 57A, the entire engine 57A is disposed rearward in order to avoid interference between the top of the engine 57A and the front wheel 61. As a result, the lever ratio b2 / a becomes small as a result of the shaft 63A being located closer to the rear, so that it is difficult to employ the single rear wheel shock absorber 51A in the vertical direction. In FIG. 5A, the fuel tank 65 is disposed below the seat 67, the air cleaner 69 is disposed at the center of the vehicle body, and the tool case 71 is disposed behind the fuel tank 65.

  In FIG. 5B showing the arrangement of the rear wheel shock absorber of the present embodiment, a large space (space S) below the seat 18 obtained by arranging the fuel tank 19 and the air cleaner AC forward with the engine E facing forward. ), A single-type rear wheel shock absorber 21 is disposed, so that a required lever ratio b / a can be secured. In addition, since the rear wheel shock absorber 21 is located at the center of the vehicle body in the left-right direction, the distance between the seat rails 17a, 17a is reduced compared to the case where the left and right rear wheel shock absorber 51 is used. Thus, the width of the sheet 18 can be reduced.

  In the above configuration, the fuel tank 19 is disposed in a wide space on the upper side of the main frame 1 extending rearward and downward as shown in FIG. 1, and the air cleaner AC is disposed in the wide space on the lower side of the main frame 1. Therefore, the fuel tank 19 and the air cleaner In addition to increasing the capacity of AC, a large space can be secured under the seat 18. Therefore, the large-volume portable article storage unit 30 can be provided under the seat 18. Further, since the fuel tank 19 is on the upper side, the refueling operation can be easily performed. Further, since the front end 15p of the cleaner case 15 is positioned in front of the front end 19p of the fuel tank 19, the volume of the air cleaner AC can be effectively utilized by utilizing the wide space below the front part of the main frame 1 that is lowered rearward. Can be increased. Here, since the engine E is set forward, a larger space can be secured on the lower side of the main frame 1, and the capacity of the air cleaner AC can be further increased.

  Further, since the single rear wheel shock absorber 21 is disposed in the large space secured under the seat 18, as described above, compared to the case where the left and right double rear wheel shock absorbers are used. The width of the sheet 18 can be reduced to form a sporty shape. As a result, rider's footing is also improved. Here, since the rear wheel shock absorber 21 is set in the front-rear direction, the large rear wheel shock absorber 21 can be arranged using a large space under the seat 18. Since the front end portion of the rear wheel shock absorber 21 is attached to the main frame 1 having high rigidity, it is stably supported.

  Further, in the forward-facing engine E, since the front area of the engine is small, the air cooling performance due to the traveling wind is likely to deteriorate. However, according to this configuration, the traveling wind A is converted into the engine E by the air guide surface 27 of the cleaner case 15. Therefore, particularly excellent air cooling performance can be maintained. Further, since the carburetor 16 is disposed behind the cleaner case 15, it is possible to prevent the fuel supply of the carburetor 16 from becoming unstable when there is an unstable flow near the intake port on the rear surface of the cleaner case 15. it can.

  Further, since the recess 25 is provided in front of the seat 18, the appearance as a moped can be maintained, and the support shaft 26 is rotatably supported by one support shaft 26 provided at the front end portion of the seat 18. While simplifying the structure, as shown by the two-dot chain line, the seat 18 can be opened and closed smoothly by increasing the angle of rotation of the seat 18 forward. This improves the usability of the portable product storage unit 30 having a large storage space.

  As described above, the preferred embodiments of the present invention have been described with reference to the drawings, but various additions, modifications, or deletions can be made without departing from the spirit of the present invention. For example, in the above embodiment, the engine E is set forward, and the front surface 27 of the cleaner case 15 is located above the front side of the engine E. However, the engine does not have to face forward, and the front surface of the cleaner case is It does not have to be above the front side of the engine. Therefore, such a thing is also included in the scope of the present invention. Furthermore, the present invention is not limited to the moped type, but can be applied to other various types of motorcycles such as a super sports type and a naked type.

1 Main Frame 2 Head Pipe 15 Cleaner Case 15p Cleaner Case Front End 18 Seat 19 Fuel Tank
19a Rear end 19p of fuel tank Front end 21 of fuel tank Rear wheel shock absorber
25 Recess 30 Portable goods storage
41 Tank cover
42 Step-through cover AC Air cleaner E Engine FR Body frame

Claims (7)

A main frame extending backward and downward from a head pipe that rotatably supports the steering shaft;
A fuel tank located between the head pipe and the seat on the upper side of the main frame and having a rear end extending below the seat;
An air cleaner located under the main frame;
An engine located below the fuel tank;
A tank cover covering the fuel tank;
A step-through cover that forms a recess between the tank cover and the sheet;
With
The front end of the case of the air cleaner is located in front of the front end of the fuel tank;
A motorcycle in which a rear end portion of the fuel tank extends rearward beyond the recess . The motorcycle according to claim 1 , wherein an upper edge portion of the step-through cover is positioned below a lower edge of the seat. The motorcycle according to claim 1 or 2 , wherein the fuel tank and the air cleaner are arranged so as not to overlap in a side view. The motorcycle according to any one of claims 1 to 3 , further comprising a rear-wheel cushioning device directed in the front-rear direction below the seat. The motorcycle according to any one of claims 1 to 4 , wherein the engine is set forward. The motorcycle according to any one of claims 1 to 5 , wherein a front surface of the case of the air cleaner is located above a front side of the engine. The motorcycle according to any one of claims 1 to 6 , further comprising a portable article storage portion under the seat.

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