JP4658800B2 - Saddle-type vehicle fuel tank - Google Patents

Description

  The present invention relates to an improvement in a fuel tank of a saddle-ride type vehicle.

2. Description of the Related Art As a conventional fuel tank for a saddle type vehicle, a fuel tank is known that is disposed inside a vehicle body frame (see, for example, Patent Document 1).
Japanese Patent No. 3517217

As shown in FIGS. 1 and 3 of Patent Document 1, the fuel tank 1 of the saddle-ride type vehicle is viewed from the side surrounded by the upper frame Ufr, the lower frame Lfr, and the rear upper frame Rufr constituting the vehicle body frame Fr. Arranged in a triangular space.
A rear wheel RW is disposed below the fuel tank 1, a seat S is disposed above the fuel tank 1, and an engine E is disposed in front of the fuel tank 1.

As described above, since the periphery of the fuel tank 1 is surrounded by the vehicle body frame Fr, the rear wheel RW, the seat S, and the engine E, there is a limit in increasing the capacity thereof.
Further, since the fuel tank 1 is disposed rearward with respect to the vehicle body center portion having the vehicle body center of gravity, the moment of inertia around the vehicle body center of gravity increases, and when the remaining amount of fuel in the fuel tank 1 changes, the moment of inertia changes. Also changes.

  Furthermore, since the rear part of the fuel tank 1 is thin and long in the vehicle width direction, depending on the remaining amount of fuel, the fuel suction of the fuel pump P is also affected, and it becomes difficult to stably supply the fuel to the engine E. .

  An object of the present invention is to easily ensure the capacity of the fuel tank, a change in the vehicle body around the center of gravity of the inertia of the fuel tank is reduced, further, is to the fuel to the engine tends to stably supplied.

The invention according to claim 1 is a saddle riding in which a vehicle body frame is provided with a steering shaft for steering the front wheels, an engine as a drive source, and a fuel tank disposed above the engine for supplying fuel to the engine. In the type vehicle, in the fuel tank, the fuel filler port is disposed in front of the steering shaft, and the fuel filler port (86) is connected to the front outer surface of the guard member (71) attached to the front end of the vehicle body frame (11) and the steering shaft (28 ) Is arranged at the rear of the vehicle with respect to the straight line (89) contacting the front outer surface of the bar handle (88) attached to the upper end of the bar handle (88).

As an operation, the degree of freedom of arrangement of the main body of the fuel tank is increased by disposing the fuel filler opening of the fuel tank ahead of the steering shaft. For example, the main body of the fuel tank can be disposed near the center of gravity of the vehicle body, and the moment of inertia around the center of gravity of the vehicle body of the fuel tank is reduced.
In addition, when the main body side of the fuel tank is near the center of gravity of the vehicle body, the moment of inertia acting on the fuel hardly changes, and the fuel supply to the engine becomes more stable.
Further, by arranging the front outer surface and the filler opening in the rear of the vehicle than the line tangent to the front outer surface of the bar handle of the guard member, for example, when there is interferer over the front of the vehicle and the guard member and the bar handle In addition, the interference does not interfere with the fuel filler opening.

The invention according to claim 2 is characterized in that the fuel tank and the fuel filler port are connected by a connecting pipe.
As an effect, the connection pipe can be extended while avoiding interference with parts arranged between the fuel tank and the fuel supply port by connecting the fuel tank and the fuel supply port with a connection pipe as a tubular member. Become.

The invention according to claim 3 is characterized in that the connecting pipe is a sub-tank for storing fuel and extends forward of the vehicle through the side of the air cleaner.
As an action, fuel is accumulated in a sub tank extending forward of the vehicle, and the capacity of the fuel tank is increased.

The invention according to claim 4 is characterized in that a bulging portion for storing fuel is provided in the connecting pipe.
As an effect, fuel is stored in the bulging portion in addition to the connecting pipe, and the capacity of the fuel tank is further increased.

The invention according to claim 5 is characterized in that the fuel filler opening is arranged in a front fender that covers the upper part of the front wheel.
As an operation, the oil supply port arranged in the front fender is supplied with oil from the front or side of the vehicle.

  In operation, by arranging the oil supply port to the rear of the vehicle than the straight line passing through the guard member and the bar handle, for example, when there is interferer over the front of the vehicle and the guard member and the bar handle, interferer There is no interference with the filler port.

In the invention according to claim 1, since the fuel filler opening of the fuel tank is arranged in front of the steering shaft, the degree of freedom of arrangement of the main body of the fuel tank can be increased, and the main body of the fuel tank is arranged near the center of gravity of the vehicle body. Thus, the moment of inertia around the center of gravity of the vehicle body of the fuel tank can be reduced, and even if the remaining amount of the fuel tank in the fuel tank changes, the change in the moment of inertia can be reduced. Further, the change in the moment of inertia acting on the remaining fuel is reduced, and it is possible to easily supply the fuel to the engine stably.
In addition, the oil filler port is located at the rear of the vehicle rather than a straight line that contacts the front outer surface of the guard member attached to the front end of the body frame and the front outer surface of the bar handle attached to the upper end of the steering shaft. A fuel filler port can be arranged.

  In the invention according to claim 2, since the connection pipe for connecting the fuel tank and the fuel filler opening is provided, the connection pipe may be extended between the fuel tank and the filler filler opening while avoiding interference with components and the like. It is possible to increase the degree of freedom of arrangement of the connecting pipe.

  In the invention according to claim 3, since the connecting pipe is a sub-tank that stores fuel and extends to the front of the vehicle through the side of the air cleaner, fuel can be stored in the sub-tank to increase the capacity of the fuel tank. The capacity can be easily secured.

  In the invention which concerns on Claim 4, since the bulging part which stores a fuel was provided in the connection pipe, the capacity | capacitance of a fuel tank can be further increased by storing a fuel in a bulging part with a connection pipe.

  In the invention according to claim 5, since the fuel filler opening is arranged in the front fender that covers the upper part of the front wheel, it can be selected and refueled from the front of the vehicle or the side of the vehicle, and the usability of the saddle riding type vehicle is improved. Can do.

The best mode for carrying out the present invention will be described below with reference to the accompanying drawings. The drawings are viewed in the direction of the reference numerals.
FIG. 1 is a side view of a vehicle equipped with a fuel tank according to the present invention. The vehicle 10 includes a body frame 11, a left frame 12 and a right frame 13 (the back side of the left frame 12, not shown). A plurality of cross members (for example, the front upper member 14, the rear upper member 16, and the rear lower member 17) for connecting the left frame 12 and the right frame 13 and the left frame 12 and the right frame 13 are extended rearward. A pair of left and right seat rails 21 and 22 (only the reference numeral 21 on the near side is shown), a pair of left and right subframes 23 extending rearward from the left frame 12 and the right frame 13 and having rear ends connected to the seat rails 21 and 22; 24 (only the reference numeral 23 on the front side is shown), and a steering shaft for steering the left and right front wheels 26 and 27 to the front portion of the body frame 11 8 is rotatably mounted, a power unit 33 including an engine 31 and a transmission 32 is mounted below the left frame 12 and the right frame 13, an air cleaner 35 and a fuel tank 36 are disposed above the power unit 33, and the vehicle body frame 11 This is a straddle-type rough terrain vehicle in which a swing arm 37 is attached to a lower rear portion of the swing arm 37 so as to freely swing up and down, and left and right rear wheels 41 and 42 are attached to the rear end of the swing arm 37.

The engine 31 is configured by connecting an intake device 46 and an exhaust device 47 to a cylinder portion 45 projecting obliquely upward.
The intake device 46 includes an intake pipe 52 connected to a cylinder head 51 provided in the cylinder portion 45, a throttle body 53 having one end connected to the upper end of the intake pipe 52, and a connecting tube connected to the other end of the throttle body 53. 54 and an air cleaner 35 connected to the tip of the connecting tube 54.
The exhaust device 47 includes an exhaust pipe 61 having one end connected to the cylinder head 51 and a muffler 62 connected to the rear end of the exhaust pipe 61.

Here, 71 is a guard member attached to the front end of the vehicle body frame 11, 72 is a front cover, 73 and 74 are front fenders that cover the front wheels 26 and 27, 76 is a body cover, 77 is a seat, and 78 and 81 are rear covers. Rear fenders covering the upper sides of the wheels 41 and 42, 82 is a radiator, 83 is a tubular sub tank provided in the fuel tank 36, 84 is a filler cap that closes the fuel filler port 86 provided at the tip of the sub tank 83, and 87 is in the fuel tank 36. A built-in fuel pump 88 is a bar handle attached to the upper end of the steering shaft 28, and 89 is a straight line passing through the outer surface of the guard member 71 and the outer surface of the bar handle 88.
The oil filler port 86 is disposed on one front fender 73, specifically, a portion protruding from the upper surface of the front fender 73, and a filler cap 84 is attached to the protruding portion.

  FIG. 2 is a side view showing a vehicle body frame and a fuel tank according to the present invention. A left frame 12 of the vehicle body frame 11 includes an aluminum alloy cast front frame 91 and an aluminum alloy extrusion connected to the rear portion of the front frame 91. The center frame 92 is made of a material, and a rear frame 93 made of forged aluminum alloy is connected to the rear portion of the center frame 92. Reference numerals 95, 96, and 97 denote joint portions between the front frame 91 and the center frame 92, and 101 and 102 denote joint portions between the center frame 92 and the rear frame 93.

These joints 95, 96, 97, 101, and 102 have either end surfaces directly or one end as a thin shaft and a hollow portion formed at the other end, and the thin shaft is fitted into the hollow portion. It is the joined part, and is joined by welding or fastening with bolts and nuts.
The basic structure of the right frame 13 (not shown) is the same as that of the left frame 12 because it is arranged on the back side of the left frame 12, and the description thereof is omitted.

  The front frame 91 is a molded product in which a triangle and a rectangle are combined. Specifically, the front frame 91 is a member in which two members having a U-shaped cross section are welded together. Suspension arm support portions 105 to 108 that support a suspension arm for a front wheel (not shown) on the side surface so as to freely swing up and down, and a bolt for attaching a support plate (not shown) that supports the lower end of the steering shaft 28 to the lower end portion The insertion holes 111 and 111 are opened.

  The suspension arm support portions 105 and 106 are portions that support one upper arm, and the suspension arm support portions 107 and 108 are portions that support one lower arm.

  The center frame 92 includes an upper frame 115, a lower frame 116, the connecting frame for connecting each of the lower frames 116 provided with a bracket portion 117 side and the rear projecting portion 118 side which projects rearward and obliquely downward from the front frame 91 121 It consists of.

  The rear frame 93 is a member of substantially U-shaped side view, a power unit 33 and the mounting holes 123 to 125 for mounting (see Figure 1), seat rail 21 protrusions 126 attached (see FIG. 1) and the mounting holes 127 And a protrusion 128 and a mounting hole 131 for attaching the subframe 23 (only the reference numeral 23 on the near side is shown). The attachment hole 125 is also a hole for inserting a pivot shaft that is a shaft on which the swing arm 37 (see FIG. 1) swings.

  Fuel tank 36 is a resin molded article, the tank body 135 which is disposed between each of the rear part of the left frame 12 and right frame 13, the sub tank 83 of the tubular extended from the tank body 135 to the front of the vehicle, the sub-tank 83, a filler cap 84 attached to a fuel filler port 86 provided at the tip of 83, and a fuel pump 87 provided in the tank body 135.

The tank body 135 is a container in which an upper bulging portion 135A that bulges upward is formed in the upper front portion.
The sub tank 83 is not limited to being disposed above each of the left frame 12 or the right frame 13, but may be disposed on the inner side of each of the left frame 12 and the right frame 13, and for extending linearly. However, it may be extended in a curved line to avoid interference with other parts.

3A and 3B are cross-sectional views showing the operation of the fuel tank.
(A) is a comparative example, and the fuel tank 300 is provided with a fuel filler port 301 at the upper part, which is closed with a filler cap 302 and has a fuel pump 303 built therein. Reference numeral 305 denotes a seat disposed above the fuel tank 300.

  In the figure, the fuel tank 300 is filled with the fuel 307. Thus, since the seat 305 is disposed above the fuel tank 300 and the fuel filler port 301 is disposed above the fuel tank 300, it is difficult to secure a space for increasing the capacity above the fuel tank 300.

  (B) is an example (this embodiment), and the capacity of the tank body 135 is increased by forming an upper bulging portion 135A in the upper part of the tank body 135 of the fuel tank 36. The capacity can be increased by extending the sub-tank 83 forward. The cross-hatched portion in the figure shows the capacity increased with respect to the fuel tank capacity shown in (a) when the fuel tank 36 is filled with the fuel 140.

  Fuel supply port 86, so disposed on the front fender 73 covering the upper side of the front wheel 26 and 27, selected from the vehicle front or side of the vehicle can be refueling, it is possible to improve the usability of the straddle-type vehicle 10 . In addition, you may make it protrude from the front fender 73. FIG. Thereby, the filler cap 84 can be easily opened.

4 is a cross-sectional view taken along line 4-4 of FIG. 2, and a groove 35b extending substantially in the vehicle front-rear direction is provided on the lower side surface of the air cleaner case 35a constituting the air cleaner 35, and the inner surface of the groove 35b is flexible. A member 141 is pasted, and a tubular sub tank 83 is inserted inside the support member 141, and the sub tank 83 is supported by the air cleaner case 35a.
Thus, by supporting the middle of the sub tank 83 with the air cleaner case 35a, it is possible to prevent the long sub tank 83 from shaking.

  FIG. 5 is a side view showing a main part of another embodiment of the sub-tank according to the present invention. The fuel tank 143 is a resin molded product and is disposed between the rear portions of the left frame 12 and the right frame 13. 143a, a sub-tank 143b as a connecting pipe extending from the tank main body 143a to the front of the vehicle substantially along the upper surface of the upper frame 115 of the center frame 92, and a filler cap attached to an oil supply port 86 provided at the tip of the sub-tank 143b. 84 and a fuel pump 87 provided in the tank main body 143a.

  The tank main body 143a is a container provided with an upper bulging portion 143c that bulges upward in the upper front portion, and an air vent 143d provided above the upper bulging portion 143c. Reference numeral 144 denotes an air vent hose connected to the air vent 143d.

  The sub tank 143b is not limited to being arranged above each of the left frame 12 or the right frame 13, but may be arranged inside each of the left frame 12 and the right frame 13, and for extending linearly. However, it may be extended in a curved line to avoid interference with other parts.

FIG. 6 is an explanatory view showing still another embodiment of the sub tank according to the present invention.
(A) is a side view of the main part, and a sub tank 138 as a connecting pipe includes a tubular main tank part 138a and side bulging parts 138b bulged laterally from the main tank parts 138a before and after the air cleaner 35, 138c, and by connecting the rear end of the main tank portion 138a to the tank body 135 (see FIG. 2), fuel is also stored in the side bulging portions 138b and 138c to increase the tank capacity. .

  (B) is a view taken in the direction of arrow b in (a), and the main tank portion 138a is supported by a groove portion 35b provided in the air cleaner 35, and the side bulging portions 138b and 138c are bulged toward the inner side of the vehicle body. Thus, the outer side of the main tank portion 138a is made flat to avoid interference with other parts.

  (C) is a line c-c sectional view of (b), the lateral bulging portion 138b is inclined so portions so as to become lower as it approaches the bottom wall 138d into the main tank portion 138a. The bulging portion 138c (see (b)) has the same shape as the side bulging portion 138b.

  By inclining the bottom walls 138d of the side bulging portions 138b and 138c in this way, the fuel stored in the side bulging portions 138b and 138c can be smoothly discharged to the main tank portion 138a side.

FIG. 7 is an explanatory view showing still another embodiment of the sub-tank according to the present invention.
(A) is a side view of the main part, and a sub-tank 139 as a connecting pipe includes a tubular main tank part 139a and a side bulging part 139b bulged laterally from the main tank part 139a before and after the air cleaner 35, 139c, and the rear end of the main tank portion 139a is connected to the tank body 135 (see FIG. 2), so that fuel is also stored in the side bulging portions 139b and 139c to increase the tank capacity. .

  (B) is a view taken in the direction of arrow b in (a), and the main tank portion 139a is supported by a groove portion 35b provided in the air cleaner 35, and the side bulging portions 139b and 139c are bulged inwardly of the vehicle body. Thus, the outer side of the main tank portion 139a is made flat to avoid interference with other parts.

  Reference numeral 139d in the figure denotes rear inclined walls formed at the rear portions of the laterally bulging portions 139b and 139c, respectively, and the fuel stored in the laterally bulging portions 139b and 139c is mainly stored by the rear inclined walls 139d and 139d. It can be made easy to flow into tank part 139a.

  (C) is a perspective view which shows the main tank part 139a and one side bulging part 139b, and shows that the side bulging part 139b was integrally formed in the main tank part 139a.

  (D) shows a line d-d sectional view of (b), the lateral bulging portion 139b is inclined so portions so as to become lower as it approaches the bottom wall 139e in the main tank portion 139a. The bulging portion 139c (see (b)) has the same shape as the side bulging portion 139b.

  By inclining the bottom walls 139d of the side bulging portions 139b and 139c in this way, the fuel stored in the side bulging portions 139b and 139c can be smoothly discharged to the main tank portion 139a side.

FIG. 8 is an explanatory view showing the structure of the main part of the vehicle body frame according to the present invention.
FIG. 8A is a view taken in the direction of the arrow 8 in FIG. 2, and inner protrusions 145 and 146 that protrude inward are integrally formed on the left frame 12 and the right frame 13, respectively. It shows that the U-shaped groove 14a formed in the front upper member 14 having a U-shaped cross section made of an extruded material is fitted and the fitting portion is joined by welding. Alternatively, the front upper member 14 may be fastened to the inner protrusions 145 and 146 with bolts and nuts.
(B) is the bb sectional drawing of (a), and shows having set the front upper member 14 as the member of the cross-sectional U-shape opened downward.

9 (a) and 9 (b) are explanatory views showing a steering shaft support plate according to the present invention.
(A) is a perspective view showing the support plate 151. The support plate 151 made of aluminum alloy is a member having a U-shaped cross section, and a base portion 153 having a mounting hole 152 for attaching a steering shaft, and the base portion 153 It is a member that includes bent portions 154 and 156 formed by bending both ends, and has a plurality of frame attachment holes 157 that are attached to the vehicle body frame in the bent portions 154 and 156, respectively.

  (B) is a diagram showing a mounting state to the vehicle body frame 11 of the support plate 151 (as viewed from the direction of extension of the steering shaft 28), the bolt insertion holes 111 of the bolts 161, the left frame 12 and right frame 13 It shows that the support plate 151 is attached to the left frame 12 and the right frame 13 by screwing nuts 162 into the front ends of the bolts 161 respectively.

  Thus, by fastening the support plate 151 to the left frame 12 and right frame 13 by bolts 161 and nuts 162, for example, it is possible to prevent deformation of the frame, such as when welding, the front frame 91 side A decrease in alignment of the front wheels suspended by the suspension can be prevented.

  Figure 10 is a sectional view showing a suspension arm support according to the present invention (first embodiment), the suspension arm support 105 includes an arm supporting bracket 171 made of an aluminum alloy in the substantially U-shaped cross section, the arms A bolt 172 passed through the head insertion hole 171a and the bolt insertion hole 171b of the support bracket 171, a spherical plain bearing 173 attached to the support bracket 171 with the bolt 172, and the spherical plain bearing 173 for positioning the arm support bracket 171. Are arranged on both sides of the spherical sliding bearing 173 and positioning members 174 and 176 through which the bolts 172 are inserted. The spherical sliding bearing 173 is fitted with a steel cylindrical member 178 provided at the end of the steel suspension arm 177. Combine. The arm support portions 106 to 108 have the same structure as the arm support portion 105 described above, and detailed description thereof is omitted.

The support bracket 171 is a member attached to the left frame 12, specifically, the front frame 91 by welding.
The bolt 172 includes a head 172a and a shaft portion 172b extending from the head 172a, and is a member in which a nut 182 is screwed at the tip.

  Spherical plain bearing 173 includes an inner ring 183, made of an outer ring 184 and having a concave spherical surface which fits freely sliding into a convex spherical surface formed on the inner ring 183. Reference numeral 186 denotes a snap ring attached to an annular groove on the inner peripheral surface side of the cylindrical member 178 in order to prevent the outer ring 184 from coming off from the cylindrical member 178.

  The positioning members 174 and 176 are inserted inside the outer ring 184 and have small diameter portions 174a and 176a whose tips are respectively contacted with end surfaces of the inner ring 183, and large diameter portions 174b and 176b provided at the end portions of the small diameter portions 174a and 176a. It consists of.

  FIG. 11 is a cross-sectional view showing a suspension arm support portion (second embodiment) according to the present invention. The suspension arm support portion 190 includes a convex portion 191 formed integrally with the left frame 12 and an opening in the convex portion 191. A first bush 192 fitted into the through-hole 191a, a second bush 193 fitted to an end of the first bush 192, a collar 194 rotatably inserted inside the first bush 192, A bolt 197 inserted into each of the bolt insertion holes 196a and 196a of the steel arm end 196 and the hollow portion 194a of the collar 194 with a U-shaped cross section applied to both ends of the collar 194, and the bolt 197 It consists of a nut 198 screwed into the tip.

  The arm end 196 is a member provided at the end of the suspension arm 177. By tightening the arm end 196 with a bolt 197 and a nut 198, the arm end 196, the bolt 197, the nut 198, and the collar 194 are The first bush 192 and the second bush 193 on the convex portion 191 side can swing freely.

FIG. 12 is a cross-sectional view showing a suspension arm support portion (third embodiment) according to the present invention. The same components as those of the second embodiment shown in FIG.
The suspension arm support portion 200 includes steel arm support brackets 201 and 202 having L-shaped cross sections that are attached to the internal threads 91 a and 91 a of the left frame 12 by bolts 181 and 181, and between these arm support brackets 201 and 202. A collar 194 arranged, a first bush 192 fitted to the collar 194 so as to be rotatable and fitted to a through-hole 203 opened in a steel arm end 204, and an end of the first bush 192 The fitted second bushing 193, bolt insertion holes 201a, 202a opened in the arm support brackets 201, 202 and the hollow portion 194a of the collar 194, and a nut 198 screwed into the tip of the bolt 197. It consists of.

  The arm end portion 204 is a member provided at the end portion of the suspension arm 177. By tightening the arm support brackets 201 and 202 and the collar 194 with bolts 197 and nuts 198, the arm end portion 204, the first bushing 192, and the second end portion are provided. The bush 193 can swing with respect to the collar 194.

FIG. 13 is a cross-sectional view showing a suspension arm support portion (fourth embodiment) according to the present invention. The same components as those of the second embodiment shown in FIG.
The suspension arm support part 210 passes the bolts 211 and 211 through the bolt insertion holes 213a and 213a and the bolt insertion holes 91b and 91b of the left frame 12, and screws the nuts 212 and 212 to the ends of the bolts 211 and 211, respectively. An arm support bracket 213 having a U-shaped cross section attached to the arm 12, a collar 194 disposed inside the arm support bracket 213, and a through hole that is rotatably fitted to the collar 194 and opened in the arm end portion 204 The first bush 192 fitted to the 203, the second bush 193 fitted to the end of the first bush 192, the bolt insertion holes 213b and 213b opened in the arm support bracket 213, and the hollow portion of the collar 194 At the end of the bolt 197 passed through 194a and the bolt 197 Consisting of elaborate nut 198 Metropolitan.

  The arm end portion 204 is a member provided at the end portion of the suspension arm 177, and the arm end portion 204, the first bushing 192, and the second bushing 193 are tightened by tightening the arm support bracket 213 and the collar 194 with the bolt 197 and the nut 198. However, it can swing with respect to the collar 194.

  As described above with reference to FIGS. 1 and 2, the present invention firstly relates to the vehicle body frame 11, the steering shaft 28 for steering the front wheels 26 and 27, the engine 31 as a drive source, and the fuel in the engine 31. in straddle-type vehicle 10 includes a fuel tank 36 disposed above the engine 31 to supply, the fuel tank 36, characterized in that a fuel supply port 86 to the front than the steering shaft 28.

  Thereby, the degree of freedom of arrangement of the tank main body 135A of the fuel tank 36 can be increased, the tank main body 135A of the fuel tank 36 can be arranged near the center of gravity of the vehicle body, and the moment of inertia around the center of gravity of the vehicle body of the fuel tank 36 can be increased. Even if the remaining amount of fuel in the fuel tank 36 changes, the change in the moment of inertia can be reduced. Further, the change in the moment of inertia acting on the remaining fuel is reduced, and it is possible to easily supply the fuel to the engine 31 stably.

Secondly, the present invention is characterized in that the fuel tank 36 and the fuel filler port 86 are connected by a sub tank 83 as a connecting pipe.
Thereby, the sub tank 83 can be extended between the fuel tank 36 and the fuel filler port 86 while avoiding interference with components and the like, and the degree of freedom of arrangement of the sub tank 83 can be increased.

Thirdly, the present invention is characterized in that the connecting pipe is a sub-tank 83 for storing fuel and extends to the front of the vehicle through the side of the air cleaner 35.
Thereby, the fuel can be stored in the sub tank 83 to increase the capacity of the fuel tank 36, and a predetermined capacity can be easily secured.

Fourthly, according to the present invention, as shown in FIGS. 6 (a) to 6 (c), side bulging portions 138b and 138c for storing fuel are provided in a main tank portion 138a as a sub tank of the fuel tank 138. Features.
As a result, the fuel can be stored in the side bulging portions 138b and 138c to further increase the capacity of the fuel tank 36.

Fifthly, the present invention is characterized in that the fuel filler port 86 is disposed in the front fender 73 covering the front wheels 26 and 27 as shown in FIG.
Thereby, it is possible to select and refuel from the front or side of the vehicle, and to improve the usability of the saddle riding type vehicle 10.

Sixth, the present invention is characterized in that the fuel filler port 86 is disposed behind the straight line 89 passing through the guard member 71 attached to the front end of the vehicle body frame 11 and the bar handle 88 attached to the upper end of the steering shaft 28. And
Thereby, the oil filler port 86 can be arrange | positioned in the position where external force is hard to apply.

  In the present embodiment, the fuel tank 36 is a resin molded product. However, the present invention is not limited to this, and the fuel tank 36 may be made of metal such as a steel plate. Further, the shape and application of the fuel tank 36 are not limited to this.

  The fuel tank of the present invention is suitable for saddle riding type vehicles and other vehicles.

1 is a side view of a vehicle including a fuel tank according to the present invention. It is a side view which shows the vehicle body frame and fuel tank which concern on this invention. It is sectional drawing which shows the effect | action of a fuel tank. FIG. 4 is a cross-sectional view taken along line 4-4 of FIG. It is a principal part side view which shows another embodiment of the subtank concerning this invention. It is explanatory drawing which shows another another embodiment of the sub tank which concerns on this invention. It is explanatory drawing which shows another further embodiment of the sub tank which concerns on this invention. It is explanatory drawing which shows the structure of the vehicle body frame principal part which concerns on this invention. It is explanatory drawing which shows the support plate for steering shafts which concerns on this invention. It is sectional drawing which shows the suspension arm support part (1st Embodiment) which concerns on this invention. It is sectional drawing which shows the suspension arm support part (2nd Embodiment) which concerns on this invention. It is sectional drawing which shows the suspension arm support part (3rd Embodiment) which concerns on this invention. It is sectional drawing which shows the suspension arm support part (4th Embodiment) based on this invention.

Explanation of symbols

  10 ... straddle-type vehicle (vehicle), 11 ... vehicle body frame, 26 ... front wheel, 28 ... steering shaft, 31 ... engine, 36 ... Fuel tank, 71 ... guard member, 73, 74 ... front fender, 83,143B , 138, 139... Connecting pipe (sub tank), 86... Oil filler port, 88... Bar handle, 89 .. straight line, 138 b, 138 c.

Claims (5)

A steering shaft (18) for steering the front wheels (26, 27) to the vehicle body frame (11), an engine (31) as a drive source, and an engine (31) for supplying fuel to the engine (31) In a straddle-type vehicle provided with a fuel tank (36) disposed above,
The fuel tank (36) has a fuel filler port (86) disposed in front of the steering shaft (18),
The fuel supply port (86) is in contact with the front outer surface of the bar handle (88) attached to the upper end of the front outer surface and said steering shaft (28) of the guard member (71) attached to the front end of the body frame (11) It is arranged behind the vehicle from the straight line (89) .
A fuel tank for a saddle-ride type vehicle. The fuel tank for a saddle type vehicle according to claim 1, wherein the fuel tank (36) and the fuel filler port (86) are connected by a connecting pipe (83) . Said connecting pipe (83), a sub-tank to accumulate the fuel, the saddle riding type fuel tank of a vehicle according to claim 2, wherein through the lateral, characterized in that extended to the front vehicle of the air cleaner (46). The fuel tank for a saddle-ride type vehicle according to claim 2 or 3, wherein a bulging portion (138c, 138d) for storing fuel is provided in the connection pipe (83) . The fuel for a straddle-type vehicle according to any one of claims 1 to 4, wherein the fuel filler opening (86) is disposed in a front fender (73, 74) covering an upper part of the front wheel. tank.

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