JP4296438B2 - Scooter type motorcycle - Google Patents

Description

  The present invention relates to a scooter type motorcycle in which a radiator is disposed at a front portion of a vehicle body, an engine is disposed at a rear portion of the vehicle body, and a fuel tank is disposed between the radiator and the engine.

  In general, a scooter type motorcycle has a unit swing engine, which is an engine, a drive mechanism, a rear swing arm, and the like, arranged at the rear of the vehicle body. In addition, scooter type motorcycles equipped with a water-cooled engine are equipped with a radiator for cooling the cooling water of the engine. In order to increase the cooling efficiency of this radiator, the radiator is disposed in the front part of the vehicle body. There is also. Also, in a large scooter type motorcycle that requires a large capacity fuel tank, it is difficult to place the fuel tank at the rear end of the vehicle body due to problems such as space and weight (inertia). It may be placed in the center of the car body.

For example, Patent Document 1 discloses a scooter type motorcycle in which a radiator is disposed at the front of the vehicle body, an engine is disposed at the rear of the vehicle body, and a fuel tank is disposed between the center of the vehicle body, that is, the radiator and the engine. . In such a scooter type motorcycle, the fuel tank is heated from the front and rear by the radiator and the engine, since rising temperature of the fuel in the fuel tank to contribute like percolation, between the radiator and the fuel tank and the fuel It is necessary to thermally shut off the tank and the engine.

  Therefore, in the scooter type motorcycle shown in FIG. 6, in order to prevent heat damage to the fuel tank 30 by the radiator 26 and the engine 20, between the radiator 26 and the fuel tank 30 and between the fuel tank 30 and the engine 20. Between them, heat shield plates 145 and 147 made of iron plate, aluminum plate, rubber mat or the like are respectively attached. In some cases, a glass mat with aluminum foil is attached to the front and rear surfaces of the fuel tank 30.

Note that a fuel supply port 33 protruding upward from the upper surface of the tank main body 31 is provided at the upper portion of the fuel tank 30, and a fuel tray 141 made of rubber or synthetic resin (for example, made of polyethylene) is provided at the fuel supply port 33. It is mounted so as to surround the periphery, and the fuel spilled around the fuel filler port 33 during fueling is received by the fuel tray 141 and discharged through the drain hose 51.
Japanese Utility Model Publication No. 1-136096

  However, the conventional heat shield structure for a scooter type motorcycle as shown in FIG. 6 has a problem that the number of parts and the number of assembling steps increase, resulting in an increase in cost.

  The present invention has been made in view of the above problems, and provides a scooter type motorcycle that can prevent thermal damage caused by a radiator and an engine disposed before and after a fuel tank with a small number of parts and assembly steps. With the goal.

In order to achieve the above object, the present invention forms a leg space recessed downward in a vehicle body between a leg shield and a seat, disposes a fuel tank below the rex pace, and seats behind the fuel tank. In a scooter type motorcycle having an engine disposed below , a radiator is disposed in front of the fuel tank and in front of the leg space between the front wheel and the front surface of the fuel tank facing the radiator. A fuel tank cover is provided that surrounds the fuel tank with a plate-like front shield, a plate-like rear shield that covers the rear surface facing the engine, and a lateral shield that faces each of the left and right lateral surfaces. Features.

  According to the present invention, the fuel tank cover is covered with the fuel tank cover, including the front and rear surfaces and the left and right lateral surfaces of the fuel tank, and heat from the radiator and the engine disposed before and after the fuel tank is blocked by the fuel tank cover. In addition, the heating of the fuel tank is suppressed, and heat damage such as percolation due to the temperature rise of the fuel in the fuel tank can be prevented with a small number of parts and assembly steps.

  Embodiments of the present invention will be described below with reference to the drawings.

  1 is a side view of a scooter type motorcycle according to the present invention, FIG. 2 is an enlarged view of a portion around a fuel tank in FIG. 1, FIG. 3 is a perspective view of a fuel tank cover, and FIG.

As shown in FIGS. 1 and 2, the body frame of the scooter type motorcycle according to the embodiment of the present invention is provided with a head pipe 11 at the front upper end, and is separated from the head pipe 11 to the left and right and rearwardly downward. Left and right main tubes 12 are provided. The main tube 12 is formed in a substantially “shi” shape composed of a front rising portion, a lower flat portion, and a rear rising portion, and a head pipe 11 is joined to the upper end of the front rising portion. The left and right upper tubes 13 are provided so as to connect the middle portion of the front vertical portion of the main tube 12 and the upper end of the rear vertical portion, and the upper tube 13 extends from the rear upper end of the main tube 12 to the rear. It has a rearward extension that extends upward.

  The head pipe 11 supports a steering wheel 17 that can be steered left and right. A steering wheel 18 is provided on the upper side of the steering wheel 17, and a front fork 19 is extended and retracted on the lower side of the steering wheel 17. The front wheel 1 is rotatably supported at the lower end of the front fork 19. A pivot portion 14 is provided at the front portion of the rear extension portion of the upper tube 13. The pivot portion 14 has a front of a unit swing engine 20 in which an engine, a drive mechanism, a rear swing arm and the like are integrated. The upper part is rotatably supported by swinging the rear end side up and down, and the rear wheel 2 is rotatably supported at the rear end part of the unit swing engine 20. A cushion unit 24 is mounted between the rear upper part of the unit swing engine 20 and the rearward extending portion of the upper tube 13. The unit swing engine 20 is provided with a cylinder 21 at the front, and a carburetor 22 is mounted on the upper side of the cylinder 21.

  A plurality of sheet support members 16 are fixed to the upper side of the upper tube 13, and a sheet composed of the front seat 3 and the rear seat 4 is supported on the upper side of the sheet support member 16. Further, a radiator 26 for cooling the cooling water of the unit swing engine 20 is mounted between the front vertical portions of the left and right main tubes 12, and a fan 27 is provided on the rear surface side of the radiator 26.

  A fuel tank 30 is mounted in a space surrounded by the left and right main tubes 12 and the left and right upper tubes 13, that is, between the cylinder 21 of the unit swing engine 20 and the fan 27 of the radiator 26. A fuel tank cover 40 is attached to (supported) 30. The vehicle body frame is covered with a cover made up of a hunting cowl 6, a leg shield 7 and the like, and a concave leg space is formed between the leg shield 7 and the front seat 3, that is, above the fuel tank 30. The oil supply lid 8 is provided so as to be freely opened and closed.

  As shown in FIG. 2, the fuel tank 30 is provided with a box-shaped tank main body 31 with the lower side projecting rearward, and mounting brackets 31 a and 31 b are forward and downward from the front and lower surfaces of the tank main body 31, respectively. It protrudes to the side. A cylindrical fuel filler port 33 is provided on the upper portion of the fuel tank 30 so as to protrude upward from the upper surface of the tank body 31, and a cap 34 is detachably screwed to the upper end of the fuel filler port 33. Yes. In addition, a level gauge 35 for detecting internal fuel is mounted on the upper portion of the fuel tank 30.

  As shown in FIGS. 2 to 4, the fuel tank cover 40 includes an integrally formed fuel tray 41 and a shielding body (a front shielding part 45, a lateral shielding part 46 and a rear shielding part 47), which will be described later. The lip portion 42a of the oil supply port fitting hole 42 is formed of a relatively soft synthetic resin such as vinyl chloride so that the outer peripheral surface of the oil supply port 33 is in close contact.

  The fuel tray 41 is formed in a deep dish shape composed of a bottom surface portion and a peripheral surface portion so as to receive fuel spilled around the fuel filler port 33 at the time of refueling. Is provided with a thin and elastically deformable lip portion 42a on the inner periphery of the oil supply port fitting hole 42 so as to be in close contact with the outer peripheral surface of the oil supply port 33. It protrudes to the side. In addition, a discharge port 43 for discharging the received fuel is provided at a lower position on the bottom front portion of the fuel tray 41, and a drain hose 51 is connected to the discharge port 43.

  The shielding body of the fuel tank cover 40 covers the front surface, the lateral surface (right surface, left surface) and the rear surface of the tank body 31 so as to cover the front surface shielding portion 45 and the lateral surface shielding portion 46 (right surface shielding portion, left surface). The shielding part) and the rear shielding part 47 are continuous cylinders, and the lower side is formed in a shape projecting rearward. The upper side of the cylindrical shield (the front shield 45, the lateral shield 46, and the rear shield 47) is closed by the fuel tray 41, and the lower side of the shield is open. That is, the shield is formed in a skirt shape that extends downward from the fuel tray 41.

  In addition, a plurality of gap forming ribs 48 are spaced from each other on the inner surface of the shield so that a gap (air layer) is formed between the tank body 31 and the shield to improve heat insulation. Projecting inward. The front shielding part 45 is provided with a bracket projection hole 45a corresponding to the mounting bracket 31a of the fuel tank 30. It should be noted that the lower end portion of the front shielding portion 45 may be inclined rearward and downward so that air can smoothly escape from the radiator 26 side.

  The fuel tank cover 40 is covered from above on the fuel tank 30 with the cap 34 removed before the fuel tank 30 is mounted on the vehicle body frame, and the fuel inlet 33 is connected to the fuel inlet fitting hole 42 of the fuel tray 41. Is attached to the fuel tank 30 so that the mounting bracket 31a protrudes from the bracket protrusion hole 45a and the gap forming rib 48 contacts the outer surface of the tank body 31. The fuel tank 30 (and the fuel tank cover 40) is supported by the reinforcing member 15 between the main tube 12 and the upper tube 13 and the lower flat portion of the main tube 12 via the mounting brackets 31a and 31b. Has been. A fuel hose 38 is connected to the rear lower end of the fuel tank 30 so as to supply fuel to the carburetor 22 via a fuel pump (not shown).

  Therefore, the front shield 45 and the lateral shield 46 of the fuel tank cover 40 indicate that heat (hot air) enters the rear fuel tank 30 (tank body 31) from the radiator 26 at the front of the vehicle body. In addition, the rear surface shielding portion 47 and the lateral surface shielding portion 46 of the fuel tank cover 40 prevent heat from entering from the unit swing engine 20 (cylinder 21) at the rear of the vehicle body toward the front fuel tank 30. Thus, heat damage such as percolation due to an increase in the temperature of the fuel in the fuel tank 30 can be prevented.

In addition, since the front shielding part 45, the lateral shielding part 46 , the rear shielding part 47, and the fuel tray 41 are integrated as the fuel tank cover 40, a heat shield plate is separately attached before and after the fuel tank 30. Compared with, the number of parts and the number of assembling steps can be reduced, and the cost can be reduced.

  FIG. 5 is a perspective view showing another embodiment of the fuel tank cover. In addition, description is abbreviate | omitted about the component similar to the above-mentioned fuel tank cover (FIG. 3), and the same code | symbol is used.

  As shown in FIG. 5, an outside air introduction hole 46a is provided in the upper front part of the horizontal surface shielding portion 46 of the fuel tank cover 40, and the rear end of the outside air introduction duct 53 is connected to the outside air introduction hole 46a. The front end of the outside air introduction duct 53 is disposed in a front part of the radiator 26 of the leg shield 7. Accordingly, the outside air A (cold air) is introduced between the fuel tank cover 40 and the tank body 31 from the outside air introduction duct 53 and discharged from the lower side of the fuel tank cover 40, whereby the tank body 31 is actively cooled. Further, heat damage such as percolation due to an increase in the temperature of the fuel in the fuel tank 30 can be more suitably prevented.

  As described above, according to the present embodiment, the fuel tank 30 is covered with the fuel tank cover 40 around the front and rear surfaces and the left and right lateral surfaces, and the radiator 26 and the unit swing arranged before and after the fuel tank 30. Since the heat from the engine 20 is blocked by the fuel tank cover 40, the heating of the fuel tank 30 is suppressed, and the heat damage such as percolation due to the temperature rise of the fuel in the fuel tank 30 with a small number of parts and assembly man-hours. It is prevented.

  In addition, the fuel tank cover 40 can be easily attached so as to cover the fuel tank 30 from above, and the heat from the radiator 26 and the unit swing engine 20 causes the front shield 45 and the rear shield of the fuel tank cover 40. 47 prevents the fuel tank 30 from entering the fuel tank 30 from the side, and protects the fuel tank 30 from the heat of the radiator 26 and the unit swing engine 20 to effectively prevent thermal damage to the fuel tank 30. be able to.

  Furthermore, a gap (air layer) can be formed between the tank main body 31 of the fuel tank 30 and the shield of the fuel tank cover 40 to improve the heat insulation, and the heat damage to the fuel tank 30 can be more effective. Can be prevented.

1 is a side view of a scooter type motorcycle according to an embodiment of the present invention. FIG. 2 is an enlarged view of a portion around a fuel tank in FIG. 1. FIG. 3 is a perspective view of a fuel tank cover in FIG. 2. It is a longitudinal cross-sectional view of the fuel tank cover of FIG. It is a perspective view which shows another form of a fuel tank cover. FIG. 6 is a partial side view showing an example of a heat shield structure of a fuel tank of a conventional scooter type motorcycle.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Front wheel 2 Rear wheel 3 Front seat 4 Rear seat 6 Front cowl 7 Leg shield 8 Refueling lid 11 Head pipe 12 Main tube 13 Upper tube 14 Pivot shaft 15 Reinforcement member 16 Seat support member 17 Steering 18 Handle 19 Front fork 20 Unit swing Engine
21 Cylinder 22 Carburetor 24 Cushion unit 26 Radiator 27 Fan 30 Fuel tank 31 Tank body 31a, 31b Mounting bracket 33 Filling port 34 Cap 35 Level gauge 38 Fuel hose 40 Fuel tank cover 41 Fuel tray 42 Filling port fitting hole 43 Discharge port 45 Front shield (shield)
45a Bracket projection hole 46 Side shield (shield)
46a Outside air inlet 47 Rear shield (shield)
48 Ribs for forming gap 51 Drain hose 53 Outside air introduction duct A Outside air

Claims (4)

A scooter type automatic which is formed by forming a leg space recessed downward in the vehicle body between the leg shield and the seat, arranging a fuel tank below the rex pace, and arranging an engine below the seat behind the fuel tank. In motorcycles,
A radiator is disposed in front of the leg space between the front side of the fuel tank and the front wheel, and a plate-like front shielding part covering the front surface of the fuel tank facing the radiator, and a rear surface facing the engine A scooter type motorcycle having a fuel tank cover surrounding the fuel tank with a plate-shaped rear surface shielding portion covering the vehicle and lateral surface shielding portions facing the left and right lateral surfaces, respectively. The radiator is disposed with a gap between the front shield part of the fuel tank cover and an air passage from the radiator side is formed between the front shield part and the radiator. Item 2. A scooter type motorcycle according to item 1. The scooter type motorcycle according to claim 2, wherein the front shield part of the fuel tank cover has a shape in which a lower end part thereof is inclined rearward and downward. The front shielding portion of the fuel tank cover is disposed between the fuel tank and the front vertical portion of the pair of left and right main tubes extending rearward and downward from the head pipe of the vehicle body frame, while the radiator is disposed at the front vertical position of the main tube. The scooter type motorcycle according to claim 1 or 2, wherein the scooter type motorcycle is arranged in front of the upper part.

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