JP2002284072A - Heat shielding structure of fuel tank for scooter type vehicle - Google Patents

Abstract

PROBLEM TO BE SOLVED: To easily manufacture a heat shielding plate for a fuel tank at a low cost. SOLUTION: A scooter type vehicle 10 having a low floor 25 includes an engine 211 arranged on a rear part of the floor 25, a radiator 221 arranged on a front part of the floor 25, and the fuel tank 230 arranged between the engine 211 and the radiator 221. Divided heat shielding plates 241, 242, 243 are arranged at least on front and rear surfaces of the fuel tank 230.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a heat shielding structure for a fuel tank for a scooter type vehicle.

[0002]

2. Description of the Related Art Some scooter-type vehicles are relatively large, having a water-cooled engine, a radiator for cooling the engine, and a large-capacity fuel tank. In such a scooter-type vehicle, a layout in which a radiator is arranged at a front portion of a vehicle body and an engine is arranged behind the radiator is widely adopted in order to enhance cooling efficiency of the radiator. Further, due to the arrangement space and the like, a large fuel tank may be arranged close to a radiator or an engine. In such an arrangement, the fuel tank is affected by heat from the radiator and the engine. As a technique for preventing the influence of heat from an engine or a radiator, for example, Japanese Patent Application Laid-Open No. 2000-229593 “Scooter-type motorcycle” (hereinafter referred to as “prior art”) is known.

In the above-mentioned prior art, as shown in FIG. 2 of the publication, a radiator 26 (the number is cited in the publication; the same applies hereinafter) is disposed at the front of the vehicle body, and the engine is disposed at the rear of the vehicle body. The present invention relates to a motorcycle in which a fuel tank 30 is disposed between a radiator 26 and an engine 20. Further, as shown in FIGS. 2 to 4 of the above-mentioned publication, the above prior art discloses a cylindrical fuel tank cover 4 having an upper surface closed.
0 is put on the fuel tank 30 from above, and the fuel tank 30 is attached to the vehicle body frame in this state. By doing so, the thermal effect on the fuel tank 30 from the engine 20 or the radiator 26 can be prevented by the fuel tank cover 40. The fuel tank cover 40 is an integrally molded product of a soft resin.

[0004]

However, the above-mentioned conventional fuel tank cover 40 is a large-sized member because it can cover the fuel tank 30. In order to integrally mold such a large cover, a large molding die is required.
This is a factor that increases the manufacturing cost. Moreover, the fuel tank 30
It is not always easy to manufacture the fuel tank cover 40 having a complicated shape according to the above shape.

An object of the present invention is to provide a technique capable of easily and inexpensively manufacturing a heat shield plate for a fuel tank.

[0006]

In order to achieve the above object, a first aspect of the present invention is a scooter type vehicle having a low-floor type floor, wherein a radiator is disposed at a front portion of the floor and an engine is disposed at a rear portion of the floor. The fuel tank is disposed between the radiator and the engine, and divided heat shield plates are disposed at least on the front and rear surfaces of the fuel tank.

[0007] A heat shield plate for preventing the influence of heat from the engine and the radiator is divided into at least a front surface and a rear surface of the fuel tank. Since the heat shield is divided, the size of the heat shield from the engine and the radiator can be taken into consideration, and the size can be arbitrarily and minimized in accordance with the shape of each surface of the fuel tank. As a result, each heat shield plate is relatively small, and its manufacture is extremely easy. In addition, since the molding die can be small and the material can be small, it can be manufactured at low cost. Furthermore, since the heat shield plate is divided, each heat shield plate can be freely mounted on the vehicle body after the fuel tank is mounted on the vehicle body, and the mounting workability is good.

According to a second aspect of the present invention, the heat shield plate disposed on the front surface of the fuel tank is a resin sheet also serving as a wind guide for the radiator, and is provided between the fuel tank and the down tube which hangs downward from the head pipe. It is characterized by being arranged. Since it is a heat shield plate made of a resin sheet, it has a very simple shape and can be manufactured at lower cost.
Further, since the heat shield is disposed between the down tube and the fuel tank, the heat shield can be easily attached to the down tube. Therefore, the workability of attaching the heat shield plate is good. Furthermore, since the heat shield plate also serves as a wind guide, there is no need to provide a different wind guide, and the number of parts can be reduced.

According to a third aspect of the present invention, the heat shield plate disposed on the rear surface, or on the left and right surfaces of the fuel tank is a rubber seat, and the upper portion is attached to the vehicle body frame. Since it is a rubber sheet, it can be freely deformed and can be freely arranged according to the space around the fuel tank. In addition, the fuel cell can be easily arranged by effectively utilizing the narrow space around the fuel tank. Furthermore, since it is a heat shield plate made of a sheet, the shape is extremely simple, and it can be manufactured at lower cost.

[0010]

Embodiments of the present invention will be described below with reference to the accompanying drawings. Note that "before", "after",
“Left”, “right”, “up”, and “down” follow directions seen from the driver. Also, the drawings should be viewed in the direction of reference numerals. FIG. 1 is a left external view of the motorcycle according to the present invention, and shows that the motorcycle 10 is a scooter-type vehicle having a low-floor floor 25.

A body cover 20 that covers the entire body frame of the motorcycle 10 includes a front cowl 21 that covers a front portion of the body frame and an upper part of the front wheel, which will be described later, an upper cover 22 that covers an upper opening of the front cowl 21, and a front cowl. An inner cover 23 that covers the rear part of the vehicle body 21, a center cover 24 that extends rearward from the rear end of the inner cover 23 and covers the longitudinal center of the vehicle body frame, and extends outward from a lower edge of the lower end of the center cover 24 so that the driver's feet are placed on the inner cover 23. Low floor type floor 2
5, a floor skirt 26 extending downward from the outer edge of the low floor type floor 25, a rear side cover 27 extending rearward from the center cover 24 and covering the rear side of the body frame,
A rear cover 28 extending rearward from the rear end of the rear side cover 27 and covering the rear portion of the vehicle body frame.

The front cowl 21 has a transparent wind screen 31 on the upper part. The inner cover 23 includes a leg shield 91 that covers the front portion of the driver's leg. Further, the motorcycle 10 includes a handle 203 at a front portion of the vehicle body, and a seat 208 and a step holder 300 at a rear portion of the vehicle body.

The handle 203 includes grips 203a and 203a.
03a is relatively high and is pulled backward. The handle 203 was covered with the handle cover 101. The handle cover 101 includes a handle 203.
And a top handle cover 103 covering the top of the handle 203.

The seat 208 is a double seat comprising a front seat portion 208a on which the driver sits and a rear seat portion 208b on which the occupant sits. The step holder 300 is disposed adjacent to the rear portion of the center cover 24, and has a pillion step (step for occupant) 310 on which the occupant places his / her foot.
Is mounted so that it can be stored and exposed. In the figure, 261
Is a headlamp, 262 is a turn signal, 263 and 263 are mirrors, 264 is a front fender, 265 is a seat lock lock, 266 is a rear air spoiler, 267 is a tail lamp, 268 is a rear fender, 269 is a sub stand, and 320 is a main stand. is there. In addition, 271 and 2
Reference numeral 72 denotes a master cylinder,
The operation of 274 generates a braking hydraulic pressure.

FIG. 2 is a right external view of the motorcycle according to the present invention, and shows that a meter panel 92 is provided above the front cowl 21 and behind the wind screen 31. As is clear from the above description, the windscreen 31, the leg shield 91, and the meter panel 92 can be provided at the front of the vehicle body. Further, this figure shows that the step holder 300 including the pillion step 310 is also arranged on the right side of the motorcycle 10. 275
Is an exhaust silencer.

FIG. 3 is a side sectional view of the motorcycle according to the present invention, and shows the motorcycle 10 viewed from the left side. The motorcycle 10 includes a body frame 110, a front fork 201 attached to a head pipe 111 of the body frame 110 so as to be able to swing left and right, a front wheel 202 attached to the front fork 201, and a front fork 2.
01 and the body frame 1
An engine 211 attached to the rear of the engine 10 and an engine 21
, A rear wheel 205 attached to a rear portion of the power transmission mechanism 212, a power transmission mechanism 212 capable of swinging up and down around a crankshaft of the engine 211,
10, a rear cushion unit 206 in which a rear end of a power transmission mechanism 212 is suspended, a storage box 207 mounted on an upper rear portion of the body frame 110, and a storage box 20.
7 is a scooter-type vehicle having, as a main configuration, the above-mentioned seat 208 which is disposed on the front panel 7 and which can be opened and closed.

The front fork 201 is a gate-shaped fork disposed below the head pipe 111. The upper part of the front fork 201 and the head pipe 111
Is covered with a front cowl 21. Engine 21
Reference numeral 1 denotes a water-cooled two-cylinder engine in which two left and right cylinder heads 215 are slightly inclined forward and upward and are arranged substantially horizontally. Power transmission mechanism 212 is a belt converter continuously variable transmission with a centrifugal clutch that transmits the power of engine 211 to rear wheel 205.

The storage box 207 is a box that is elongated in the vehicle longitudinal direction so that two helmets Hf and Hr can be stored in the front and rear.
a and an upper box 207b superimposed on the rear upper part of the lower box 207a. In the figure, reference numeral 281 denotes an air cleaner arranged on the side of the storage box 207;
2 is a connecting tube, 283 is a storage box 2
Reference numeral 07 denotes an air chamber, 284 denotes a throttle valve, 285 denotes an inlet pipe, and 286 denotes a battery.

FIG. 4 is a perspective view of a vehicle body frame according to the present invention. The vehicle body frame 110 includes a front frame 112 connected to a head pipe 111 and a front frame 1.
A pair of left and right rear frames 1 extending rearward from the rear of the rear frame 12
15 and 115 are a double cradle-type integrated frame that is connected by welding. The head pipe 111 has a cowl stay bracket 111a.

The front frame 112 includes a pair of left and right upper frames 113 extending rearward and downward from the head pipe 111.
113, and the pair of upper frames 11
Below the head pipe 111, a pair of left and right down tubes 114, 114 are suspended downward from the head pipe 111, and the lower ends of the pair of down tubes 114, 114 are extended rearward to the lower ends of the pair of upper frames 113, 113. It is connected and further extended rearward and upward. Since the front frame 112 has such a configuration, it is possible to provide a substantially triangular space Sp1 in side view, which is surrounded by the pair of upper frames 113, 113 and the pair of down tubes 114, 114.

Between the front end of the left rear frame 115 and the front end of the right rear frame 115, a first cross member 121 of a front view portal type is bridged, and the left upper frame 113
The second cross member 122 is bridged between the lower end of the upper frame 113 and the lower end of the right upper frame 113, and the first bracket 123 for the engine is coupled to the center position of the second cross member 122 in the vehicle width.

A third cross member 124 is bridged between the rear end of the horizontal portion of the left down tube 114 and the rear end of the horizontal portion of the right down tube 114. The second bracket 125 for the engine is connected to the center of the width, and the third brackets for the left and right engines are attached to the rear ends of the left and right down tubes 114, 114.
The brackets 126 are connected.

A pair of left and right rear frames 115, 115
Is a member having a vertically long cross-sectional shape, one end of which is joined to the middle of the pair of left and right upper frames 113, 113 and the other end is extended rearward. Here, the “vertical cross-sectional shape” refers to a cross-sectional shape whose vertical dimension is larger than its horizontal dimension. Specifically, the rear frames 115, 115 are formed of square pipes having a vertically long rectangular cross section.

In the present invention, a pair of right and left rear frames 11 is provided.
It is characterized in that three cross members 131 to 133 are detachably bridged between 5, 115. In particular,
A front rear cross member 131, a middle rear cross member 132, and a rear rear cross member 133 are provided between the left and right rear frames 115, 115 in this order from the front. These three cross members 131 to 133
Are bolted on the upper surfaces of the rear frames 115, 115. Since the rear frames 115 are made of square pipes, it is easy to mount them with the three cross members 131 to 133 mounted thereon.

The front rear cross member 131 is a gate-shaped member as viewed from the front, and extends a rear open U-shaped stay 131a in a plan view from the left and right standing portions to the front.
1a, a seat hinge supporting portion 131b is connected to the front end of the U-shaped stay 131a, and an extension member 131c extends forward from the front end of the U-shaped stay 131a.
The cross member 121 is bolted. The middle rear cross member 132 is a bar-shaped member, and the rear rear cross member 133 is a front open U-shaped member in plan view.

Further, left and right rear frames 115, 115
The left and right cushion brackets 134, 13
4 between the rear portions of the left and right rear frames 115, 115.
After that, the left and right transport hooks 136 and 136 are connected to the lower rear cross member 135.

This figure shows the vehicle body frame 110
, A pair of left and right floor support stays 141 and 141 and an under frame 143 are detachably attached to the left and right, and a plurality of headed pins 144... More specifically, the left and right floor support stays 141 and 141 are low floor type floor 2
5 (see FIG. 1), and brackets 145, 145 of the left and right down tubes 114, 114.
These members are bolted to 146 and 146. The right floor support stay 141 has an engine ignition coil 226 and a bolt 227, 22
7 is a member detachably attached. The ignition coil 226 attached to the lower part of the down tube 114 will be located lower than the low floor type floor 25.

The under frame 143 is a member that is hung between horizontal parts of the left and right down tubes 114, 114 so as to be hung.
4 are bolted to the four brackets 146, 146, 147, 147. Such an underframe 14
Reference numeral 3 denotes left and right side members 143a, 143a extending along the horizontal portions of the down tubes 114, 114, a central cross member 143b extending between central longitudinal portions of the side members 143a, 143a, and a side member 143.
a, cross member 1 spanned between the rear ends of 143a
43c. Reference numeral 148 is a hook for hooking a heat shield plate for a fuel tank described later.

The headed pins 144... Are members for retaining a heat shield plate for a fuel tank, which will be described later, and include left and right upper frames 113, 113 and left and right down tubes 1.
A total of six are provided on the outer portions of the first and second cross members 14 and 114 and on the left and right front portions of the first cross member 121. In the figure, 151 is a front cross member, and 152, 152 and 153 are stays.

FIG. 5 is a left side view of the vehicle body frame, the engine, the power transmission mechanism, and the seat according to the present invention.
The engine 211 and the power transmission mechanism 212 are disposed below the engine 15 and the engine 115. The engine 211 and the power transmission mechanism 212 are arranged near the connecting portion between the front frame 112 and the left and right rear frames 115 and 115 (only the left is shown in this figure; the same applies hereinafter). This shows that 211 has been attached.

Specifically, at the rear of the front frame 112, a pair of upper frames 113, 113, a pair of down tubes 114, 114 and a pair of rear frames 1
A space Sp having a substantially triangular shape in a side view surrounded by 15, 115
2, a cylinder head 215 and a head cover 216 of the engine 211 are disposed in the space Sp2, a lower front portion of the engine 211 is mounted on the first bracket 123 for the engine, and a lower rear portion of the engine 211 is mounted on the second bracket 125 for the engine. And the upper rear part of the engine 211 is mounted on the third engine brackets 126, 126. The front and middle rear cross members 131 and 132
It is arranged above the engine 211.

Further, FIG. 2 shows that (1) the rear end of the power transmission mechanism 212 is suspended on the left and right cushion brackets 134, 134 via the left and right rear cushion units 206, 206, and (2) the front rear Cross member 13
Reference numeral 1 indicates that it also serves as a member for supporting the seat hinge 208c of the openable / closable seat 208. Thus, the rear cushion unit 20 is
6,206 as well as the sheet 208 can be supported.

FIG. 6 is a side sectional view of the lower front portion of the motorcycle according to the present invention, which shows the motorcycle 10 as viewed from the left side, and is provided at the rear of a low floor type floor 25 indicated by imaginary lines. The engine 211 is disposed, the radiator 221 for cooling the engine is disposed at the front of the floor 25, the ignition coil 226 is disposed at the lower front of the floor 25, and the fuel tank 230 is disposed between the engine 211 and the radiator 221. Indicates that That is, the radiator 221 is connected to the engine 2
11 and the left and right down tubes 114, 114
(In this figure, only the left side is shown. The same applies hereinafter.)

A return pipe 222 for returning the coolant from the engine 211 to the radiator 221 is a hose that passes from the center of the vehicle width to the left (front side in the figure). Specifically, the return pipe 222 connected to the liquid return port of the engine 211 extends along the horizontal part of the left down tube 114 and the hanging part at the front thereof, and the upper header 221 a of the radiator 221.
Connect to

On the other hand, from the radiator 221 to the engine 21
The supply pipe 223 that supplies the cooling liquid to the hose 1 is a hose that extends from the center of the vehicle width to the right (on the opposite side in the figure). Specifically, the supply pipe 223 connected to the lower header 221b of the radiator 221 extends rearward along the horizontal portion of the right down tube 114 (on the opposite side in the figure) and connects to the liquid inlet of the engine 211. 224 is a radiator fan.

The ignition coil 226 is characterized in that it is disposed at a position on the right side (opposite side in the drawing) opposite to the return pipe 222 with respect to the center of the vehicle width and before the radiator 221. In this way, the ignition coil 226 is connected to the (1) engine 211
(2) Radiator 22 at a position not affected by heat from
(3) It can be arranged in a position where it is not affected by the heat of the exhaust air from (1) and where it is not affected by the heat from the return pipe 222.

The fuel tank 230 includes a pair of left and right upper frames 113 and 113 and a pair of right and left down tubes 1.
A substantially spurious space portion Sp <b> 1 in side view surrounded by 14 and 114.
To place. Such a fuel tank 230 has a space S
In order to effectively utilize p1, the upper frame 113, 1 when viewed from the side of the vehicle body as shown in FIG.
13 and a container whose front upper portion is tapered along the down tubes 114, 114. Further, the fuel tank 230
Lower the lower tube 114,1 to increase the capacity.
Extend below 14. Down tube 114, 114
The fuel tank 230 can be protected by covering the lower portion of the fuel tank 230 that extends further downward with the detachable underframe 143. Body frame 110
After the fuel tank 230 is inserted into the space Sp1 from below and mounted, the underframe 1 is attached to the body frame 110.
43 will be attached.

FIG. 7 is a perspective view around the fuel tank according to the present invention. The fuel tank 230 is a container in which the lower front half portion 231 of the lower front half and the upper half portion 232 of the rear upper half are overlapped with each other and the flange 233 is joined thereto. An opening 234, a breather sub-tank 235 and a fuel supply pump 236 are provided. Specifically, a breather sub-tank 235, a fuel supply port 234, and a fuel supply pump 236 are arranged in this order above the fuel tank 230 from the upper front to the lower rear.

The flange 233 has one mounting hole 233a at the upper central portion, and has two mounting holes 233b (only one on the left is shown in this figure) on the lower left and right. The filler port 234 includes a closed cap 237. The breather sub-tank 235 is
A small container that communicates with the inside.

The present invention relates to an engine 211 and a radiator 2
Reference numerals 241 and 24 denote heat shield plates for preventing the influence of heat from the return pipe 222, the supply pipe 222 and the supply pipe 223 (see FIG. 6).
The fuel tank 230 is divided into four members denoted by reference numerals 2,243,243, and these divided heat shield plates 241,242,243,243 are arranged on the front, rear, left, and right surfaces of the fuel tank 230. Divided heat shield plates 241, 242, 2
43 and 243, the engine 211 and the radiator 22
The size of the fuel tank 230 can be arbitrarily and minimized in accordance with the shape of each surface of the fuel tank 230 while taking into account the degree of thermal influence from 1. As a result, each heat shield plate 24
1,242,243,243 are relatively small and very easy to manufacture. In addition, since the molding die can be small and the material can be small, it can be manufactured at low cost.

The front heat shield plate 241 that covers the front surface of the fuel tank 230 is a resin sheet such as a hard resin, which has a substantially rectangular shape when viewed from the front. Since the front heat shield plate 241 is made of a resin sheet, the shape is extremely simple, and it can be manufactured at lower cost.

The rear heat shield plate 242 for covering the rear surface of the fuel tank 230 is a substantially rectangular rubber sheet having two hook holes 242a, 242a at the top and one hook at the bottom. It has a hole 242b. The left and right heat shield plates 243 and 243 that cover the lower half of the left side and the lower half of the right side of the fuel tank 230 are rubber sheets having two hook holes 243a and 243a at the top. The left and right heat shield plates 243 and 243 are provided between the fuel tank 230 and the return pipe 222 and the supply pipe 223 (see FIG. 6). Thus, the return pipe 222 and the supply pipe 2
23 is prevented from being transmitted to the fuel tank 230. Thus, the rear heat shield 242 and the left and right heat shields 24
Since 3,243 is a rubber sheet, it can be freely deformed and can be freely arranged according to the space around the fuel tank 230. Moreover, the arrangement can be made easily by effectively utilizing the narrow space around the fuel tank 230. Further, since the rear heat shield plate 242 and the left and right heat shield plates 243 and 243 are formed of sheets, the shape is extremely simple, and the device can be manufactured at lower cost.

Here, returning to FIG. 6 once, the explanation will be continued. The front heat shield plate 241 is disposed between the down tube 114 hanging downward from the head pipe 111 and the fuel tank 230, and is detachably attached to the front cross member 151, thereby also serving as a wind guide for the radiator 221. It is a member. For this reason, the upper end of the front heat shield 241 is curved toward the upper side of the radiator 221, and the lower end of the front heat shield 241 extends below the radiator 221. As described above, the front heat shield plate 241 is connected to the down tube 114 and the fuel tank 23.
0, the front heat shield plate 241 can be easily attached to the down tube 230. Therefore,
The mounting workability of the front heat shield plate 241 is good.

The rear heat shield plate 242 has a pin 1
By hooking on the hook 44 and hooking the lower portion on the hook 148, it can be detachably attached to the body frame 110. Also, the left and right heat shield plates 243, 243
(Only the left is shown in this figure.)
4, it can be detachably attached to the body frame 110.

As is apparent from the above description, since the heat shield plates 241, 242, 243, and 243 are divided, each of the heat shield plates 241, 242, 242, 243 and 243 can be freely attached to the body frame 110, and the attachment workability is good.

This figure shows that the front of the radiator 221 is covered with the front lower cover 93, and the underside of the radiator 221 and the fuel tank 230 is covered with the under cover 94. The front lower cover 93 extends to the front end of the under cover 94, and has a plurality of radiator ventilation holes 93a on the front surface. The under cover 94 has an exhaust port 94 a below the fan 224 to exhaust the exhaust air from the radiator 221 to the outside. The exhaust port 94a is provided with a large number of louvers (rectifying plates) 94b which face obliquely rearward.

Further, this figure shows a refueling lid 330 that is opened when supplying fuel to the fuel tank 230 through the refueling port 234, and an inspection lid 360 that is opened when inspecting a spark plug (not shown) of the engine 211. To
This shows that the vehicle body cover 20 is provided.

FIG. 8 is a view taken in the direction of arrow 8 in FIG. 6, and shows a structure in which a fuel tank 230 is attached to the vehicle body frame 110. The body frame 110 has an upper bracket 154 spanned between left and right stays 152, 152, and lower brackets 155, 155 attached to left and right down tubes 114, 114. By bolting the upper portion of the flange 233 of the fuel tank 230 to the upper bracket 154 and bolting the lower portion of the flange 233 to the lower brackets 155 and 155, the fuel tank 230 can be detachably attached to the vehicle body frame 110. . The upper portion of the flange 233 is tightly bolted to the upper bracket 154.

FIG. 9 is a sectional view taken along the line 9-9 in FIG. 8, and shows that the lower portion of the flange 233 is mounted on the lower bracket 155 via a rubber bush 156 with a bolt / nut 157, thereby performing rubber mounting. 158 is a color.

FIG. 10 is a front sectional view of the motorcycle.
(1) The body frame 110 and the fuel tank 230 are
The center cover 24, the left and right floors 25, 25, the left and right floor skirts 26, 26, and the under cover 94, and (2) the left and right down tubes 114,
Reference numeral 114 indicates that the floors 25, 25 have been bolted via the floor support stays 141, 141.

As described above, the left and right heat shield plates 243 and 243 hung on the headed pins 144... Hang down along the sides of the fuel tank 230, and 114, 114 extending through the gap between them. As described above, since the upper portions of the left and right heat shield plates 243 and 243 are merely hooked to the vehicle body frame 110, the mounting is easy. The upper portions of the left and right heat shield plates 243 and 243 are attached to the outer surfaces of the upper frames 113 and 113, and the lower portions are disposed inside the down tubes 114 and 114, the return pipe 222, and the supply pipe 223. Therefore, the heat of the return pipe 222 and the supply pipe 223 is
30 or less.

FIG. 11 is a diagram showing the operation around the radiator according to the present invention.
4 sucks air from the front of the radiator 221. For this reason, the outside air is the cooling wind (including the traveling wind when the vehicle is traveling) Fc
Enter the radiator air inlet 93a, flow through the cooling air passage, and enter the radiator 221.

The hot air (exhaust hot air) Fh that has passed through the radiator 221 is discharged from the fan 224 and guided by the front heat shield plate 241 also serving as a wind guide, and changes its flow downward. Spills out of the building. Since the direction of the hot air Fh passing through the radiator 221 is changed by the front heat shield plate 241, the hot air F to the engine 211 and the fuel tank 230 behind the radiator 221 is changed.
h can be prevented. Also, the front heat shield plate 2
Since 41 also serves as a wind guide, there is no need to provide another different wind guide.

FIG. 12 is a schematic view of a fuel tank according to the present invention. A fuel tank 230 is provided with a tray 251 surrounding the fuel supply port 234. And connect
This indicates that the other end 252b of the fuel discharge hose 252 has been opened to the atmosphere. As described above, the breather sub-tank 2
Reference numeral 35 communicates with the fuel tank 230. One end 253a of the breather hose 253 is connected to the breather sub-tank 235, and the other end of the breather hose 253 is bifurcated. 254 is a T joint for branching the other end of the breather hose 253.

FIG. 13 is a rear cross-sectional view of the fuel tank according to the present invention around the filler port.
A tube portion 251b vertically penetrated into 51a is integrally formed,
It is a fuel pan. The cylindrical portion 251b is inserted into the fuel supply port 234, and both the upper and lower surfaces of the bottom 251a are covered with the center cover 2.
The tray 251 can be attached by being sandwiched between the bottom 24b of the concave portion 24a provided in the refueling portion 4 and the upper surface 230a of the fuel tank 230. Therefore, tray 2
A member such as a bolt for mounting the 51 is unnecessary, and mounting is easy. Reference numeral 24c is a filler hole.

FIG. 14 is a right external view of the vehicle body frame and the fuel tank according to the present invention. The tray 251 has a discharge port 251c extending downward and rearward. This outlet 251c
Is connected to one end 252a of a fuel discharge hose 252, and this fuel discharge hose 252 is connected to the right upper frame 113.
, Extend to the rear right end of the under cover 94, and turn the other end 252b downward. Fuel tank 230
During the refueling, the fuel spilled around the refueling port 234 can be received by the tray 251 and discharged to the outside via the fuel discharging hose 252. Therefore, there is no fear that the spilled fuel will wet the outer surface of the fuel tank.

On the other hand, the breather sub-tank 235 has a breather port 235a extending rightward. One end 253a of the breather hose 253 is connected to the breather port 235a, and the breather hose 253 is connected to the fuel tank 23.
Hang it down along the right side of 0. That is, when the breather hose 253 passes through the space between the upper frame 113 and the down tube 114 along the fuel tank 230 when the fuel tank 230 is viewed from the front, and extends to the rear right end of the under cover 94. , Branched into two branches. The other end 253b of the branch extends to the rear left end of the under cover 94 and is open to the atmosphere, and the other end 253c of the branch temporarily extends upward along the rear surface of the fuel tank 230. It extends rearward along the left upper frame 113 and opens to the atmosphere. Therefore, even if one of the two other ends 253b and 253c is clogged, the other can secure the breather function.

In the above embodiment of the present invention,
The ignition coil 226 may be disposed at a position opposite to the return pipe 222 with respect to the center of the vehicle width.
In the case where 22 is passed rightward from the center of the vehicle width, it may be arranged leftward. Further, it is sufficient if at least the front and rear surfaces of the fuel tank 230 are provided with divided heat shield plates.

[0059]

According to the present invention, the following effects are exhibited by the above configuration. According to the first aspect of the present invention, the heat shield plate for preventing the influence of heat from the engine and the radiator is divided and arranged at least on the front and rear surfaces of the fuel tank. According to the shape of each surface of the fuel tank, the size can be arbitrarily and minimized. As a result, each heat shield plate can be made relatively small, and can be manufactured very easily. Moreover, since the molding die for each heat shield plate can be small and the number of materials can be small, each heat shield plate can be manufactured at low cost. Further, since the heat shield is divided, the fuel tank can be freely mounted on the vehicle body after the fuel tank is mounted on the vehicle body, and the mounting workability is good.

According to the second aspect, since the heat shield plate disposed on the front surface of the fuel tank is a resin sheet, the shape is extremely simple, and it can be manufactured at lower cost. Further, since the heat shield is disposed between the down tube and the fuel tank, the heat shield can be easily attached to the down tube. Therefore, the workability of attaching the heat shield plate is good. Furthermore, since the heat shield plate also serves as a wind guide, there is no need to provide a different wind guide, and the number of parts can be reduced.

According to a third aspect of the present invention, since the heat shield plates disposed on the rear surface, or on the left and right surfaces of the fuel tank are made of rubber sheets, they can be freely deformed, and can be freely arranged in accordance with the space around the fuel tank. be able to. In addition, the fuel tank can be easily disposed by effectively utilizing the narrow space around the fuel tank, and only the upper part of the seat needs to be attached to the vehicle body frame. Furthermore, because it is a heat shield made of sheet,
It is extremely simple in shape and can be manufactured at lower cost.

[Brief description of the drawings]

FIG. 1 is a left external view of a motorcycle according to the present invention.

FIG. 2 is a right external view of the motorcycle according to the present invention.

FIG. 3 is a side sectional view of the motorcycle according to the present invention.

FIG. 4 is a perspective view of a vehicle body frame according to the present invention.

FIG. 5 is a left side view of a vehicle body frame, an engine, a power transmission mechanism, and a seat according to the present invention.

FIG. 6 is a side sectional view of a lower front portion of the motorcycle according to the present invention.

FIG. 7 is a perspective view around a fuel tank according to the present invention.

8 is a view taken in the direction of arrow 8 in FIG. 6;

9 is a sectional view taken along line 9-9 in FIG.

FIG. 10 is a front sectional view of the motorcycle.

FIG. 11 is an operation diagram around a radiator according to the present invention.

FIG. 12 is a schematic view of a fuel tank according to the present invention.

FIG. 13 is a rear cross-sectional view around the fuel filler port of the fuel tank according to the present invention.

FIG. 14 is a right external view of a vehicle body frame and a fuel tank according to the present invention.

[Explanation of symbols]

10: scooter type vehicle (motorcycle), 25: low floor type floor, 110: body frame, 111: head pipe,
114 ... down tube, 211 ... engine, 221 ...
Radiator, 230: fuel tank, 241-243: heat shield (front heat shield, rear heat shield, left / right heat shield).

Claims (3)

[Claims] 1. A scooter-type vehicle having a low-floor floor, wherein a radiator is disposed at a front portion of the floor, an engine is disposed at a rear portion of the floor, and a fuel tank is disposed between the radiator and the engine. A heat shield structure for a scooter-type vehicle fuel tank, wherein divided heat shield plates are arranged at least on the front and rear surfaces of the fuel tank. 2. The heat shield plate disposed in front of a fuel tank is a resin sheet also serving as a wind guide for the radiator, and is provided between a down tube hanging down from a head pipe and the fuel tank. The heat shielding structure for a scooter-type vehicle fuel tank according to claim 1, wherein the heat shielding structure is arranged. 3. The heat shield plate disposed on the rear surface, or on the left and right surfaces of the fuel tank, is a rubber sheet,
The heat shielding structure for a scooter-type vehicle fuel tank according to claim 1, wherein the upper portion is attached to a vehicle body frame.