TW200301736A - Vehicular combustion system structure - Google Patents

Abstract

The objective of this invention is to provide a vehicular combustion system structure, capable of inhibiting over-spills of fuel from the port while increasing the unitary filling rate per unit time, reducing the size of the secondary fuel tank, and allowing installation of the secondary fuel tank and filling port in a limited space. In this invention, a secondary fuel tank 19 is installed next to a fuel filling port 21. An upper end 18a of a connecting tube 18 is connected to the secondary fuel tank 19. A primary fuel tank 17 is connected to a lower end of the connecting tube 18. The secondary fuel tank 19 has a cross-section that is greater than that of the connecting tube 18 such that when the fuel filled from the fuel filling port 21 contacts a support face 19f, the direction of injected fuel forms an obtuse angle with the direction which the fuel flows so as to smoothly connect to the connecting portion 18a of the connecting tube.

Description

20030173B 发明 玖, description of the invention (the description of the invention should state: the technical field, the prior art, and the content of the invention [the technical field of the invention] The present invention relates to a type assembled on a locomotive or a tricycle. [Previous Technology] Since the previous locomotive After the car body frame sleeve is assembled at the front of the carcass, it can be freely inserted into the head pipe, and the mouth of the head is installed to supply fuel to the fuel tank. Fuel is used (refer to Patent Document 1). It is also a corresponding fuel tank. The internal pressure changes are provided to communicate with the atmosphere to suppress the pressure in the fuel tank. [Patent Document 1] "This patent publication No. 5-41 929. [Problems to be solved by the invention] However, this kind of prior For example, if the fuel is injected into the fuel filling port with stirring and foaming, it may cause the amount of fuel to be reduced per unit time when a small amount of fuel is injected. There is also a case where a sub tank is installed near the fuel filling port, which can not effectively prevent overflow. When it is not easy to assemble in the air and refuel, if the refueling rushes away from the refueling port, or the material overflows around the refueling port, there may be fuel in the car body cover at this time. In addition, due to the vent pipe The exhaust can be ensured when the opening at the lower end is blocked, and another side flow is provided: (the embodiment and the diagram are briefly explained) The head pipe of the fuel system structure of the vehicle will be turned to the vehicle body. The combustion vent pipe is supplied from the fuel filler port, and the vent pipe rises and the negative pressure increases. When filling the fuel port with fuel, avoid overflow and problems. To prevent this, there is no guarantee that there is a limitation on the large capacity. When more fuel is added, there is a problem of combustion and car body, and storage σ discharges air, that is, the channel ’s structure is complicated (2) (2) 200301736. Therefore, the object of the present invention is to provide a fuel system structure for a vehicle, which can suppress the fuel from overflowing from the fuel filler port, increase the refueling amount per unit time, and miniaturize the auxiliary fuel tank. The auxiliary fuel tank and the fuel filler port can also be assembled in a limited space. By. Another problem is to provide a fuel system structure for a vehicle, which can properly discharge the fuel outside the vehicle even if the fuel overflows around the fuel filler port when refueling. Another problem is to provide a fuel system structure for a vehicle that allows Those with simple structure such as trachea. Another problem is to provide a fuel system structure for a vehicle, which can connect to this fuel to prevent the vehicle body from getting into the fuel tank even if the fuel is spilled around the fuel tank, and make the fuel tank periphery smaller when refueling. Can improve the observer. [Solutions to solve the problem] In order to solve the above-mentioned problem, the fuel system structure for a vehicle of the first invention claimed in the patent application is characterized in that a sub-tank is provided near the fuel filler port, the upper end of the connecting pipe is connected to the sub-tank, and the main tank is Connected to the lower end of the connecting pipe, the auxiliary selling box has a cross-sectional area larger than the cross-sectional area of the connecting pipe, so that the fuel injection receiving surface hit by the fuel added from the fuel filler port is the fuel injection direction and the fuel flow direction becomes The oblique angle is inclined, and the connection to the connection pipe is relaxed. Β The structure of the fuel system for a vehicle in which the second invention of the patent application is applied is the structure as in the first application of the patent application, and the axis of the fuel filler port and the above-mentioned 20031736 are added.

The axis of the above-mentioned connecting pipe of the connecting part of the auxiliary tank does not become coaxial, crosses or is skewed. The vehicle fuel system structure of the third invention of the patent application is the structure of the first patent application, and the fuel tank with the fuel filler port is inserted into the auxiliary fuel tank, and the fuel oil level rises to cause the fuel tank and the fuel tank to When the upper space in the auxiliary fuel tank is disconnected, the upper space in the auxiliary fuel tank is an air storage part, and a vent pipe whose other end is open to the atmosphere is connected to the upper space in the auxiliary fuel tank. The vehicle fuel system structure of the fourth invention of the scope of the patent application is the structure of the third scope of the patent application, and a protrusion is formed on the upper part of the auxiliary fuel tank, which protrudes outward to ensure a certain air storage volume. 3 The scope of the patent application The fuel system structure for a vehicle according to the fifth invention is characterized in that a fuel inlet is provided at the front part of the vehicle body frame provided with a head pipe, and fuel is supplied to the fuel tank, and a fuel receiving portion is provided around the fuel inlet, In order to receive the spilled fuel, the upper end of the drain hose that discharges the fuel stored in the fuel receiving portion outside the vehicle is connected to the fuel receiving portion, the drain hose is extended downward, and the fuel is discharged from the drain hose. The vehicle fuel system structure of the sixth invention of the patent application is the structure of the fifth invention of the patent application, and the lower end of the drain hose is opened, which is located on the upper side of the car body cover covering the lower part of the car body. The cover forms a discharge opening to allow the fuel flowing down from the opening at the lower end of the drain hose to be discharged outside the vehicle. The discharge opening α is formed at the rear of the vehicle directly below the opening at the lower end of the drain hose. The structure of the fuel system for a vehicle, for which the seventh invention of the patent application is filed, is as described in 200301736.

(4) Please use the structure of item 5 of the patent, and add a blocking wall extending upwards on the back side of the above-mentioned discharge opening, and use this blocking wall to block muddy water and so on immersed in the bottom cover through the above-mentioned discharge opening. The structure of the vehicle auxiliary fuel system of the eighth invention of the patent application is the structure of the fifth application of the patent application, and one end of the ventilation pipe is connected near the fuel filler port, and the other end is connected to the drain hose. . The vehicle fuel system structure of the 9th invention in the scope of the patent application is the structure of the fifth scope of the patent application, plus a cover that can be opened and closed freely on the vehicle body. Open the cover to expose the fuel filler port, and set the fuel filler port around the fuel filler port. The fuel receiving section made of a freely foldable elastomer is opened in conjunction with the above-mentioned opening operation of the fuel receiving section. The structure of the fuel system for a vehicle in the tenth invention of the patent application is the structure in the ninth invention in the patent application, and a flexible band is used to connect the fuel receiving portion and the cover. [Embodiments of the invention]: The present invention will be described below according to the embodiments. [Embodiment 1 of the invention] Figs. 1 to 16 are embodiments of the present invention. First, the structure is explained. The symbol 11 in the figure is the body frame of a Scooter vehicle. A color tube 12 'is provided at the front of the vehicle body frame 11. It is inserted through a steering shaft (not shown) that can rotate freely. 2 The main pipe 13 is extended rearward and obliquely downward. The main pipe 13 is equipped with a pair of lower pipes on the left and right side of the body frame. The main fuel tank 17 'supporting the "fuel tank" is extended from the top of the front end of the main fuel tank. Pipe '' connecting pipe 18, -9- (5) (5) 200301736

A sub-tank 19 having a larger cross-sectional area than the cross-sectional area of the connecting pipe 18 is arranged on the end portion i8a of the connecting pipe 18, and a filling cylinder 20 is protruded obliquely upward from the sub-tank 19, and a filling port 21 is formed at the upper end of the refueling hole 20. In addition, a fuel receiving section cover 22 is provided to open and close the fuel filler port 21. The filler cylinder 20 is formed at the middle portion to form a flange portion 20a, and the flange portion 20a has a lower side portion 20b, which is inserted into the auxiliary fuel tank 19 through the insertion opening 19d of the sub tank 19, and the upper portion of the flange portion 20a is on the upper side. The portion 20c protrudes from the outside of the sub-tank 19. The lower side portion 2 0 b is formed with a small diameter at the front end portion 20 d. As shown in FIG. 11 and FIG. 12, the stop portion 20 e abutting the end portion P 1 before the refueling P is formed, and a groove portion 20 f is formed. . The filler cylinder 20 is set so that the front end portion 20d is inclined obliquely downward, and the front end portion 20d is set to face the inclined surface 19e of the auxiliary fuel tank 19. Then, the fuel injected from the refueling port 21 through the fuel filler port 21 is brought into contact with the fuel injection receiving surface 19f of the inclined surface 19e. The fuel injection receiving surface 19 f tilts the fuel flow direction at an obtuse angle with respect to the fuel injection direction, and the sub-tank 19 changes downwardly to make the diameter smaller and smaller in cross section 'and the cylindrical portion 19c formed at the lower end is smoothly connected. The diameter of the opening I9g at the lower end of the cylindrical portion 19c is slightly equal to the diameter of the upper end 18a of the connecting pipe 18, and the opening 19g at the lower end of the sub-tank 19 is connected to the upper end 18a of the connecting pipe 18. The upper side of the sub-tank 19-type fuel injection receiving surface 19 f is shown in Fig. 2 and has a quadrangular shape when viewed from the front side of the vehicle, forming a protruding portion 19h protruding outward, and a shape with a gradually narrow width downward from the quadrangular portion. As shown in FIG. 9, when the fuel tank level F rises, when the communication between the fuel tank 20 and the upper space in the auxiliary tank 19 is interrupted, the upper space becomes cast -10-200301736

气 For the air part ', a certain volume of the air-off part is ensured by the protruding part 19h. In addition, 'as shown in FIG. 11', when viewed from the side of the handle, the axis 01 of the fuel tank 20 and the axis 02 of the connecting camp 18 of the cylinder portion 19c (connecting portion) of the auxiliary tank 19 are not coaxially intersecting . As shown in FIG. 10, when viewed from the rear of the vehicle, the axis 02 of the filler cylinder 20 and the axis 02 of the connecting pipe 18 of the cylinder portion 19c (connecting portion) of the auxiliary tank 19 are not coaxially offset. . As shown in FIGS. 1 and 2, Yu Zhizhi 19 extends the mounting piece around the mounting piece 19 a and fixes the mounting piece 19 a to the quadrangular support pipe 24 fixed to the head pipe 12 with bolts 25. A fuel receiving section 26 is arranged around the fuel filler port 21 to receive fuel overflowing around the fuel filler port 21. The fuel receiving section 26 has a quadrangular plume opening fine folding line section 26a which is opened above the arrow from the state shown in FIG. 1 to the arrow Direction folded. As shown in Fig. 13, the cover 28a provided on the foot guard 28 is opened to expand the fuel receiving portion 26. On the one hand, the cover 28a is closed to fold the fuel receiving portion 2β. The bottom of the fuel receiving portion 26 is connected to the upper end portion 27a of the drain hose 27 which discharges the fuel stored in the fuel receiving portion 26 to the outside of the vehicle. The drain hose 27 is extended downward (just below) to extend from the bottom opening 27b of the drain hose 27. Fuel is discharged outside the vehicle. The lower end opening 2 7 b of the avoidance hose 2 7 is inclined and formed to the other side of the vehicle. The lower end opening 27b of the drain hose 27 is shown on the upper side of the bottom cover 29 which covers the "carcass cover" below the vehicle body, as shown in Figs. 1 and 6. A drain opening σ 2 9 a is formed on the bottom cover 2 9 so that the fuel at the lower end opening 2 7 b of the drain hose 2 7 is discharged to the outside of the vehicle. The drain opening 2 9 a is formed at the bottom opening 27 b from the drain hose 27 Position directly below the vehicle. 200301736 ⑺ Around the bottom cover 29, around the fuel dripping position on the front side of the discharge opening 29a, a peripheral wall 29b protruding upward is formed. Inside the peripheral wall 29b, a plurality of parallel (three) guide ribs 2gc protruding in the vehicle front-rear direction are formed. (Refer to the figure.) In addition, at the rear side of the discharge opening 29a, a "forming wall 29d" of the interruption wall is formed slightly upward, and a top wall 29e is formed at the upper end of the vertical wall 29d, which is slightly forward of the auxiliary vehicle. A "blocking wall" extending in the horizontal direction. It is formed from the wall 29d and the top wall 29e to shield the muddy water and the like immersed in the bottom cover 29 through the discharge opening 29a as shown by arrow a in Fig. 6. In addition, the bottom cover 29 is discharged. The shape of the opening 29a is set such that it can be demoulded in the direction of b in FIG. 6 during molding. On the one hand, the lower end of the drain hose 27 is connected to the upper end of the air hose 30 for the oil pipe for the "ventilation pipe". 30a has a triple shape. As shown in FIG. 2 and the like, the upper end portion 30a of the air hose 30 for the oil pipe is connected to the upper surface portion 19b of the auxiliary oil tank 19, and the main oil tank is provided by the air hose 30 for the oil pipe. Adjust the pressure in 17 2. When the vehicle falls, prevent fuel from being discharged to the outside (refer to Figure 2). As shown in Figure 16, the flip 32 is provided with a partition wall 32a in the housing 32d and a communication port 32e in the partition wall 32a to open and close. The valve 32b opens and closes the communication port 32e, and the spring 32c urges the opening and closing valve 3 2b upward in Fig. 16. When the vehicle is in the upright state, the weight of the opening and closing valve 32b compresses the spring 32c to open the communication port 32e. The urging force of the spring 32c closes the communication port 32e to prevent fuel from leaking from the side of the connecting pipe 18 to the outside of the vehicle. In addition, as shown in FIG. As shown in FIG. 14, the upper end portion 31 a of the gas exhaust hose 31 -12- 200301736 ⑻ is connected to the above-mentioned filler cylinder 20. Next, the function will be described. The fuel receiving portion cover 22 is removed, and the fuel is supplied from the filler opening 21 When grabbing P for refueling, there may be cases where fuel is escaping from fueling port 21 or fuel is overflowing around fueling port 21. This spilled fuel is stored in fuel receiving section 26 provided around fueling port 21 and borrows fuel. The receiving section 26 is extended to the excretion softly below ^ 27 It is discharged out of the car through the discharge opening 29a of the bottom 盍 29. Therefore, it is possible to prevent the spilled fuel from being stored in the car body cover or getting in contact with the car body. The lower end opening 27b of the drain hose 27 is shown in FIG. Covers the upper side of the bottom rafter 29 below the vehicle body, so it can prevent the lower opening 27b from being blocked by muddy water and dust splashing. In addition, 'the discharge opening 29a of the bottom cover 29 is formed from the drain hose 27 The end opening 27b is directly behind the vehicle, so it can complement the above to prevent dirt and the like immersed in the drain opening 2 9 a from blocking its drain hose 2 and open the bottom 27 a. In addition, because the bottom cover 29 forms a plurality of guide ribs 29c ′ extending in the front-rear direction of the vehicle in parallel, the fuel dripping from the opening 27b at the lower end of the slit hose 27 is rectified and flows to the rear of the car from the bottom cover 29. The discharge opening a29a is quickly discharged. Furthermore, the muddy water or the like immersed in from the discharge opening 29a of the bottom cover 29 is shielded by the vertical wall 29d and the top wall 29e formed on the rear side of the discharge opening 29a, so that it can be prevented from entering the bottom cover 29. Therefore, the structure around the discharge opening 29a of the bottom cover 29 is demolded in the direction of -13- (9) (9) 200301736 in Fig. 6 and can be integrally formed, so the forming is also simple. The present invention is not limited to the formation of the guide ribs 29c in the front-rear direction of the vehicle, and as shown in FIG. 7 and FIG. However, if the guide rib 29c is formed as described above, the fuel can be quickly discharged from the discharge opening 29a. On the one hand, as shown in the two-point chain line in Figure 丨 丨, when the fuel tank is inserted, the front end of the fuel rush? 1 Abutment on the stopper portion 20e of the filler cylinder 20 and stop inserting, so that it does not conflict with the inclined surface ige of the auxiliary fuel tank 19 without hurting the inclined surface 1 9 e β In this state, when fuel is injected from the refueling tank As shown by arrows in FIG. 11, the groove 20f of the fuel tank 20 hits the inclined surface ige of the auxiliary fuel tank ig. The fuel flows downward along the inclined surface 19e, and is supplied to the main tank 17 through the connecting pipe 18 through the cylinder portion 19c of the auxiliary tank 19. At this time, as the fuel is injected into the lower side of the receiving surface 19 f, the diameter changes gradually and the cross section changes gradually, and the diameter of the lower end opening 19 a of the auxiliary tank 19 and the diameter of the upper end 18 a of the connecting pipe 18 are changed. The formation is slightly equal. The upper end 18a of the connecting pipe 18 is connected to the opening i9a at the lower end of the auxiliary fuel tank 19, so there is no sharp cross-sectional change in the fuel injection channel, and the connection is smooth, so it does not bubble in the auxiliary fuel tank 19, which can inhibit refueling. The overflow of the port 21 makes the fuel injected by the refueling ρ smoothly flow into the connection pipe 18. As a result, it is possible to increase the refueling amount per unit time while suppressing the fuel overflow from the fuel filler port 21. Also, since the auxiliary fuel tank 19 is located above the fuel injection receiving surface 19 f to form an air storage portion, and a protruding portion 19h protruding slightly laterally as viewed from the front side of the vehicle is formed in the air storage portion, the upper side of the auxiliary fuel tank 19 can be formed. The gas storage part and so on form a large -14- 200301736 (ίο) volume. In the closed state of the fuel filler opening 21, the air in the main fuel tank 1 is discharged from the fuel filler cylinder 20 by the gas exhaust pipe 31 for the fuel tank, and communicates with the fuel filler cylinder 20 The air in the auxiliary oil tank 19 flows into the drain hose 27 through the exhaust hose 30 ′ for the oil pipe, and is discharged from the lower end of the drain hose 2 by σ 27 b or the like. This suppresses the inside of the main tank 17! Force rises. Since the air bleed hose 3 1 for the fuel tank is connected to the uppermost position of the main fuel tank 17, the inner side of the main fuel tank 17 is full of the fuel tank, and no air storage part is formed. The air storage part is formed in the auxiliary fuel tank 1 as described above. 9. In this way, since the lower end opening 27b of the drain hose 27 can also be used as the exhaust port of the gas hose 30 for the oil pipe, there is no need to separately open α, so that the structure is simple, and the lower end opening 27b is hardly clogged as described above. However, even in the event of a blockage, the air in the sub-tank 19 is discharged by the oil pipe. The air hose 30 is discharged from the upper end portion 27a of the soft drain 27. Therefore, the bypass hose 30 for the oil pipe does not need to be provided with a bypass passage, and the structure can be simplified. In addition, when the pressure in the main oil tank 17 decreases, contrary to the above, the outside air is sucked into the auxiliary oil tank 19 by the drain hose 27 and the air bleed hose 30 for the oil pipe, so that the decrease in the pressure in the main oil tank 17 can be suppressed. [Embodiment 2 of the invention] Figs. 17 and 18 are Embodiment 2 of the present invention. The second embodiment is different from the first embodiment in that the filter tank 37 is arranged. That is, the filter tank 37 is arranged in the middle of the rose gas hose for the oil pipe, and the bypass pipe 38 is extended from the filter tank 37 and connected to the carburetor 39. Based on this, the composition of the air fuel passing through the gas bleed hose 30 for the oil pipe is due to the excessive • 15- 200301736

⑼ The enthusiasm 37 is sucked in, so it will not be released directly out of the car. The fuel component sucked by the purge tank 37 is sucked to the carburetor 39 through the bypass pipe 38 and supplied to the engine side. Therefore, it is possible to suppress the air containing fuel components from being directly discharged through the opening 2 7 b at the lower end of the drain hose 27. The other structures and functions are the same as those of the first embodiment, and therefore descriptions thereof are omitted. In the above-mentioned embodiment, the lower end portion 30b of the air hose 30 for the oil pipe is connected to the lower end portion of the drain hose 27, but without limitation, the lower end 30b of the air hose 30 for the oil pipe may be connected to The middle portion other than the lower end portion of the drain hose 27 is at other positions. [Embodiment Mode 3 of the Invention] Figs. 19 to 23 show Embodiment Mode 3 of the invention in the 9th and 10th scope of the patent application. Fig. 19 is a side view of a speed locomotive of the "vehicle" constructed by a refueling unit having a "fuel system structure" according to the present invention, and Fig. 20 is a front sectional view of a front portion of the same speed locomotive. A head tube 102 is mounted on the front upper part of the skeletal locomotive ι01 shown in FIG. 19, and the steering shaft 103 is rotatably inserted into the head tube 102. A handlebar 104 is mounted on the upper end of the steering shaft 103, and a front fork 105 is connected to the lower end of the coaxial shaft 103. The lower end of the front fork can freely rotate the shaft to support the front wheel 106. The lower tube 107 extends obliquely downward from the head tube 102, and then bends slightly horizontally toward the vehicle body. From the middle of the lower tube 107, there are a pair of left and right backrests 108, which are inclined toward the rear of the vehicle body. Extending above. However, the head tube 102 and the lower tube 107 in the front part of the vehicle body are covered with a resin front cover 109, and the rear half of the front cover constitutes the same resin foot guard r -16-(12) (12) 200301736

Board 110. Further, a seat cushion 111 is disposed behind the handlebar 104, and a low-bed type footrest n2 is provided between the seat cushion 111 and the handlebar 104. A fuel tank 1 1 3 is installed in the space below the footrest Π2. Also behind the footrest 112 and below the seat cushion 111, a unit swing engine 1 丨 4 of a power unit is provided. The above-mentioned unit swing type engine 114 is arranged on the left side of the vehicle body. This unit integrates an engine 115 with a drive source and a transmission case 116 formed by a V-belt automatic transmission and a reduction mechanism not shown in the figure. The transmission case 116 It extends from the left side of the vehicle body of the engine 115 to the rear of the vehicle body, and its rear wheel 117 is rotatably supported on the rear end by an axis. An air filter 118 is installed on the upper part of the transmission case n6, and an intake pipe 119 extending from the air filter 118 to the front of the vehicle body is connected to the intake system of the above-mentioned engine 1 1 5 with a chemical filter in the middle. Oiler 1 2 0. The unit swing-type engine 114 having the above structure is supported by the connecting mechanism 122 and swings up and down on the engine suspension 121 fixed to the above-mentioned back support 108. Its rear end is supported by the rear wheel 1 17—with the rear shock absorber 123.于 背 架 108。 In back support 108. On the other hand, the lower part of the seat cushion in of the vehicle body is covered with a resin body cover with 4, and the above unit in the body cover 124 is above the swing-type engine ι14, and the upper surface is opened by the front and rear transverse members 126 and 127. The storage box 125 is assembled on the back label 108, and the storage box 125 supports the seat cushion ln. Here, the seat is turned up and down around the hinge 1 28 as a center to open and close the storage box U5. In addition to the above-mentioned horizontal plum members 126 and 127, the horizontal support members 108 and the horizontal support members 108 are erected, and the horizontal dish members I26 and 1U are provided with grips 13 °. However, the ‘speed keda locomotive 1101 related to this embodiment, the front of the car body -17- 200301736

A small-capacity auxiliary fuel tank 1 31 is arranged on the left side of the head pipe iQ2 in a space surrounded by the front cover 109 and the foot guard 110, and a battery 1 3 2 is arranged on the right side of the head pipe 1 02 (refer to FIG. 20). A flexible fuel hose 133 extending downward from the bottom of the auxiliary fuel tank 131 is connected to the large-capacity fuel tank 1 1 3 installed under the footrest 112. Here, the fuel tank 1 3 1 is erected in the upper part directly in front of the auxiliary tank 1 3 4. The fuel tank 134 covers the fuel tank cap 135 and surrounds the fuel tank α 134 around the same fuel tank 134. A fuel receiving part 136 is provided. The above-mentioned fuel receiving section 1 36 is a vehicle that receives fuel (gasoline) that overflows from the filler when refueling, and the overflow pipe 1 3 7 extends downward from the bottom, and the lower end of the overflow pipe 1 3 7 is connected to the car in front of the fuel tank 11 3 The lower part of the body is open to the atmosphere. The ventilation hose 138 extends downward from the upper part of the auxiliary tank 131, and the ventilation hose 138 is connected to the rear of the filter tank 139 which is disposed obliquely on the left side of the fuel tank Π3. Here, the filter tank 139 is a device that separates the fuel gas introduced from the auxiliary tank 131 through the ventilation hose 138 into fuel and air. The separated fuel is attracted by the negative pressure of the intake air and is supplied through the hose 14 to the above-mentioned chemical oil. In the device 12o, the separated air is led to the overflow pipe 1 37 through the hose 1 4 1 and released into the atmosphere from the overflow pipe 1 37. On the other hand, a fuel pump 42 is mounted on the horizontal plum member 129 under the front portion of the seat cushion Π1 near the front end of the storage box 125 covered by the vehicle body cover 124, not shown. The fuel pump 142 is connected to the negative pressure hose 143, which is an extension of the intake system of the engine 1 1 5. The fuel pump 1 42 is driven by the pulsation of the intake pressure 'from the fuel tank Π 3 through the fuel hose 1 44 The fuel is boosted by suction, and this fuel is supplied to the above carburetor via a fuel hose 1 4 5 to be shaped -18- (14) (14) 200301736

Into a mixed gas. The mixed gas formed in the carburetor 120 also supplies the engine ns of the swing engine 114 of the unit for combustion. The detailed structure of the fueling portion according to the present invention will be described with reference to FIGS. 21 to 23. Fig. 2 is a side view of the state surrounding the refueling section when the fuel is not being refilled, Fig. 22 is a side view of the state surrounding the refueling section when the fuel is not recharging, and Fig. 23 is an arrow A in Fig. 22. A part of the facing portion of the foot guard 110 covering the fuel filler portion of the auxiliary fuel tank 131 is opened, and this opening is opened and closed with a resin cover i 4 6. That is, the lower part of the cover i 46 is rotatably supported by the foot guard 110 by a shaft 1 47, and a recess 146a formed on the outer surface of the upper part is provided with a release lever (opener) 148. The release lever 148 is bent into a crank shape. The shaft 149 is rotatably supported 'and biases one side (clockwise in FIG. 21) with the return spring 150. As shown in Figure 21, the lever is released when the lid 1 4 6 is closed when not refueling! The key-shaped front end of 48 is fastened to the fastening protrusion 110a protruding downward from the side of the foot guard 110 to prevent the cover 146 from being opened to maintain its closed state. However, the fuel receiving portion 136 provided around the fuel filler port 134 covering the auxiliary fuel tank 131 is a person who receives fuel that overflows from the fuel filler port 134 when refueling. In this embodiment, the fuel receiving portion 1 36 is formed of an elastomer such as rubber. It has a belly shape and can be folded freely. The fuel receiving portion 136 is provided with a flexible belt 151. The end of the belt 151 is fixed to a protrusion 146b integrally protruding from the inner surface of the cover 146. That is, the fuel receiving portion 136 is connected to the cover 146 with a belt 151. As shown in FIG. 23, a circular hole 1 5 1 a is formed in the belt 151 so as to fit into the fuel tank cover 1 3 5. It can also be constructed separately from the fuel -19- 200301736 (15) plant — —— receiving section 136. However, as shown in FIG. 21, when the fuel tank 1 is closed without fueling, the fuel receiving portion 136 and the belt 151 are both folded in the space inside the foot guard no. When refueling, the knight inserts his hand into the recess 146a of the cover 146, and pushes the release lever 148 upwards against the biasing force of the return spring 150, because the release lever 48 rotates about the axis I "in the counterclockwise direction of FIG. 21, so it is released. The front part is fastened to the foot guard 11 0 side by 11 0 a. When the release lever is pulled forward in this state ^ 48, the cover 146 is rotated forward with the shaft 147 as the center, as shown in FIG. 22, but Because the cover 146 and the fuel receiving portion 136 are connected by a belt 51, the opening operation of the cover 146 causes the belt 151 to pull the fuel receiving portion 136 and open it as shown in the figure. That is, it is linked to the opening operation of the cover 146 to open the fuel receiving 136. Therefore, according to this embodiment, the freely collapsible bellows-shaped fuel receiving portion 136 is opened in conjunction with the opening operation of the cover 146 during refueling, so that a sufficient capacity required for the fuel receiving portion 136 can be ensured, and refueling work is facilitated. And the fuel receiving unit 136 does accept the fuel that overflows from the fuel filler 134 when refueling, and discharges the fuel received from the overflow pipe 137 to the ground below the vehicle body. The fuel tank cover 135 is removed from the fuel filler 134 when refueling. Insert the band i as shown by the chain line 22 The 5i round hole 151a (refer to Figure 23) can keep the cover 135 clean. Pulling the belt 151 with the weight of the cover 135 can open the fuel receiving section. 36. The figure of closing the cover 146 except when refueling In the state shown in FIG. 21, the fuel receiving portion 136 and the belt 15 are accommodated in a compacted state by folding the inside of the foot guard 110, so the area around the fuel filler 134 is miniaturized. As a result, the outside of the foot guard and the cover 146 can be formed Flattening into a continuous plane, no need to protrude a part of the foot guard 110 as before, so it can improve the view around the fueling part 134, and ride • 20- (16) (16) 200301736

There is no restriction on the space of the foot. [Effects of the Invention] As described above, according to the first invention in the scope of the patent application, a sub-tank is provided near the fuel filler port. The upper end of the connecting pipe is connected to the sub-tank, and the main oil tank is connected to the lower end of the connecting pipe. It has a larger cross-sectional area than the cross-sectional area of the connecting pipe, so that the fuel injection receiving surface hit by the fuel added from the fuel filler port is inclined at a pure angle to the fuel injection direction and the flow direction of the fuel, and is gently connected to the connecting portion with the connecting pipe. Because the injected fuel channel has no sharp profile changes to ease the connection, there is no bubble in the auxiliary tank, which can prevent overflow from the filler port, and the fuel injected from the refueling can smoothly flow into the connection pipe and even the main tank. This can increase the refueling amount per unit time while suppressing fuel overflow at the fuel filler. Also, the capacity of the auxiliary fuel tank can be miniaturized due to slip flow, and the auxiliary fuel tank and the fuel filler port can also be configured in a limited installation space. And because a sub tank larger than the cross-sectional area is provided on the upper side of the connecting pipe, the liquid level rise during the refueling can be delayed, so backlash can be suppressed. According to the second invention in the scope of the patent application, because the axis of the filler port and the axis of the connecting pipe of the connection part of the auxiliary tank are not coaxial, cross or be skewed, the fuel is not directly sprayed to the rising fuel liquid. Surface while suppressing recoil. According to the third invention in the scope of the patent application, since the gas storage section is provided on the side of the auxiliary tank, and the main oil tank does not need to be provided with the gas storage section, the fuel storage capacity on the main fuel tank side can be increased. According to the fourth invention in the scope of the patent application, since the upper part of the auxiliary tank is formed with a protrusion, the volume of the gas storage part can be ensured. According to the fifth invention in the scope of the patent application, because the fuel around the fuel filler port overflowed, -21-200301736 ⑼ stored in the fuel receiving section located around the fuel filler port, and discharged out of the car through a drain hose protruding downward from the fuel receiving section, Therefore, it is possible to prevent the spilled fuel from being stored in the car body cover, or being stuck on the car body. According to the sixth invention in the scope of the patent application, the lower end of the drain hose is opened on the upper side of the car body cover covering the lower part of the car body, so that muddy water or dust splashed during driving can be prevented from blocking the lower end opening. Also, the exhaust opening of the car body cover is formed directly below the opening of the lower end of the exhaust hose, and is close to the rear of the vehicle. Therefore, the dirt and the like immersed in the exhaust opening from the exhaust opening can be prevented from blocking the lower end of the exhaust hose. According to the seventh invention in the scope of the patent application, the muddy water immersed from the discharge opening of the vehicle body cover is shielded by a blocking wall formed on the rear side of the discharge opening, so that it can be prevented from entering the bottom cover. According to the eighth invention in the scope of the patent application, the fuel spilled around the fuel filler is stored in the fuel receiving section provided around the fuel filler. The drain hose protruding from the fuel receiving section is discharged out of the car, so the spill can be prevented. Fuel is stored in the car body cover, or it gets stuck on the car body. Because the pressure in the fuel tank is changed when the fuel filler port is closed, for example, when the pressure in the fuel tank increases, the drain hose is discharged from the lower end of the vent pipe to the outside of the car, and when the pressure in the main tank is reduced, it is discharged from the car. The opening at the lower end of the hose is sucked into the ventilation pipe and sucked into the fuel tank, so the pressure in the main tank can be adjusted to a certain pressure. In addition, since the opening at the lower end of the drain hose can also be used as the opening of the vent pipe, there is no need to provide separate openings, and the structure can be simplified. In addition, even when the lower end of the opening is blocked, the upper end of the drain hose can be used. • 22 · (18) (18) 200301736

No need to set up a bypass pipe for the air pipe, which can make the structure simple. According to the 9th invention in the scope of the patent application, the freely folded snake-belly fuel receiving section is opened in conjunction with the start operation of the cover when refueling, so the sufficient capacity required by the fuel receiving section can be ensured, and the refueling operation is easy, and The fuel receiving unit can surely receive the fuel that overflows from the filler when the fuel is discharged. In the closed state other than when refueling, the fuel receiving section is housed in the foot guard in a miniaturized and folded state, so that the periphery of the fuel filler can be miniaturized and the observation is enhanced. According to the 10th invention in the scope of patent application, because the fuel receiving section and the cover are connected by a flexible band, the opening operation of the cover can be linked to securely open the fuel receiving section. [Brief description of the drawing] FIG. 1 is the present invention A side view of a fuel receiving portion, a drain hose, and the like according to the first embodiment. FIG. 2 is a front view of FIG. 1 related to Embodiment 1 viewed from the front of the vehicle. FIG. 3 is a rear view of FIG. 1 related to Embodiment 1 viewed from the rear of the vehicle. Fig. 4 is a plan view of Fig. 1 related to the first embodiment. Fig. 5 is a view around the discharge opening of the bottom cover according to the first embodiment as viewed from above. Fig. 6 is a sectional view taken along line A-A of Fig. 5 in connection with the first embodiment. Fig. 7 is a view corresponding to Fig. 5 corresponding to the modification of the first embodiment. Fig. 8 is a sectional view taken along line B-B of Fig. 7 in accordance with a modification of the first embodiment; Fig. 9 is a side view of a sub-tank according to the first embodiment. FIG. 10 is a view of the auxiliary fuel tank related to Embodiment 1 as viewed from the rear of the vehicle. -23- (19) 200301736

FIG. 11 is a sectional view of a sub tank and the like according to the first embodiment. Fig. 12 is a perspective view of the front end portion of the filler cylinder according to the first embodiment. Fig. 13 is an enlarged side view related to the first embodiment. Fig. 14 is an enlarged plan view related to the first embodiment. Fig. 15 is an enlarged view of a connection part between a drain hose and a tubing deflation hose according to the first embodiment. Fig. 16 is an enlarged sectional view of a reversing valve related to the first embodiment.

FIG. 17 is a schematic side view of a vehicle according to Embodiment 2 of the present invention. Fig. 18 is a schematic side view of a vehicle related to the second embodiment of the invention. Fig. 19 is a side view of a speed locomotive according to the third embodiment of the present invention. FIG. 20 is a front cross-sectional view of a speed locomotive related to the third embodiment. Fig. 21 is a side view of the state surrounding the refueling section of a non-refuelling super-speed locomotive according to the third embodiment, which is a cutaway side view. Fig. 22 is a side view of the state surrounding the refueling section when refueling a speed locomotive according to the third embodiment.

FIG. 23 is an arrow A diagram of FIG. 22 related to Embodiment 3. FIG. Symbols of the drawings: 11 ·· • Body frame 12 · · · Head tube 17 · · · Main fuel tank (fuel tank) 18 · · · Connecting pipe 18a · • • Upper end 19 · * • Sub tank 19a · •• Mounting piece -24- (20) 200301736 19b · 19c · 19e · 19f · 1 9g · 19h · • Upper surface • Tube section • Inclined surface • Fuel injection receiving surface • Bottom opening • Projection tank filler port

2 2 · · · Fuel receiving section cover 2 6, 1 3 6 · · · Fuel receiving section 2 6 a · · · Folding line section 2 · · · Drain hose 2 7a · · · Upper end 2 7 b · · · Bottom opening 29 · · · Bottom cover (body cover)

29a ··· Exhaust opening 29b ··· Peripheral wall 2 9 c ·· · Guide rib 29d · · · Vertical wall (blocking wall) 29e · · · Top wall (blocking wall) 30 · ·· Bleeding for tubing Tube (ventilation tube) 3 0 a · · · Upper end 30b · · · Lower end 3 2 · · · Flip valve -25- 200301736

(21) 3 7 · · · Filter tank 38 · · · Bypass pipe 3 9 · · · Carburetor F · · · Fuel oil level P · · · Refueling rush 101 · · · Speed locomotive (Speed locomotive Reach vehicle) 1 1 0 · · · Footguard

1 13 · · · Fuel tank · 131 · · · Deputy tank 1 3 4 · · · Filling port 1 3 5 · · · Fuel tank cap 146 · · · Cap 151 · · · With 1 5 1 a · · · Round hole (hole )

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Claims (1)

200301736 Scope of application and patent application 1. A fuel system structure for a vehicle, characterized in that a secondary fuel tank is provided near a fuel filler port, an upper end of a connecting pipe is connected to the secondary fuel tank, and a main fuel tank is connected to a lower end of the connecting pipe. It has a larger cross-sectional area than the cross-sectional area of the connecting pipe, so that the fuel injection receiving surface hit by the fuel injected from the fuel filler port is inclined at an obtuse angle to the fuel injection direction, and is connected to the connection pipe The parts are smoothly connected. 2. For example, the fuel system structure for a vehicle in the scope of the patent application, wherein the axis of the fuel filler port and the axis of the connecting pipe on the connecting portion of the auxiliary tank are not coaxial, but are crossed or skewed. 3. For example, the fuel system structure for vehicles in the scope of patent application, where the fuel tank with the fuel filler port is inserted into the auxiliary fuel tank, and when the fuel oil level rises, the communication between the fuel tank and the upper space in the auxiliary fuel tank is cut off. The upper space in the auxiliary fuel tank is an air storage part, and the upper space in the auxiliary fuel tank is connected with a vent pipe whose other end is open to the atmosphere. 4. For the fuel system structure of the vehicle as claimed in item 3 of the patent application, a protrusion is formed in the upper part of the above auxiliary fuel tank, which protrudes outward to ensure a certain air storage volume. 5. A fuel system structure for a vehicle, which is characterized in that a fuel inlet is provided at a front portion of a vehicle body provided with a head pipe of a vehicle body frame to supply fuel to a fuel tank, and a fuel receiving portion is provided around the fuel inlet, In order to receive the spilled fuel, the upper end of the drain hose that discharges the fuel stored in the fuel receiving section outside the car is connected to the fuel receiving section and extends the row downwards. A drain hose from which fuel is discharged from the vehicle. 6. For the vehicle fuel system structure of item 5 of the scope of patent application, wherein the lower end of the above drain hose is open and located on the upper side of the body shell covering the vehicle body below, and a discharge opening is formed in the vehicle body cover so that The fuel flowing down from the opening at the lower end of the drain hose is discharged outside the vehicle, and the discharge opening is formed behind the vehicle at a position directly below the opening at the lower end of the drain hose. 7. The fuel system structure for a vehicle according to item 5 of the patent application, wherein a blocking wall extending upward is formed on the rear side of the above-mentioned discharge opening, and the blocking wall is used to block muddy water and the like immersed in the housing through the above-mentioned discharge opening. 8. For the fuel system structure for a vehicle according to item 5 of the patent application, in which one end of a vent pipe is connected near the fuel filler port and the other end is connected to the drain hose. 9. For the fuel system structure of the vehicle for which item 5 of the patent application is filed, a freely-closable cover is provided on the vehicle body, and the cover is opened to expose the fuel filler port, and a fuel foldable elastomer is provided around the fuel filler port. The fuel receiving unit is opened in conjunction with the opening operation of the lid. 10. The fuel system structure for a vehicle according to item 9 of the scope of patent application, wherein the fuel receiving portion and the cover are connected by a flexible band.