JP2009101853A - Oiling port device of vehicular fuel tank - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To prevent movement of ethanol gas from an upper part inside of a fuel tank to an oiling guide cylinder, in addition to prevention of intrusion of flame from an oiling port into the fuel tank, by using a flame arrestor. <P>SOLUTION: This oiling port device of a vehicular fuel tank comprises an oiling port 15a in an upper wall 3a of a vehicular fuel tank 3 storing ethanol fuel as fuel for an engine and an oiling guide cylinder 15 extended from the oiling port 15a into the fuel tank 3. The oiling guide cylinder 15 is provided with a flame arrestor 21 covering a lower opening part so as to allow the fuel to flow and, on the other hand, so as to prevent intrusion of flame and a skirt 27 extended downward from the peripheral edge of the flame arrestor 21 so as to prevent convection of air between the fuel tank 3 and the oiling guide cylinder 15 to be generated through the flame arrestor 21. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a fuel tank device for a vehicle fuel tank provided with a fuel filler port on an upper wall of a vehicle fuel tank that stores ethanol fuel as an engine fuel, and a fuel guide cylinder that extends from the fuel filler port into the fuel tank. Regarding improvements.

  Recently, research and development of vehicles using ethanol as fuel has been actively conducted. By the way, in a fuel tank storing ethanol fuel, when the ethanol concentration is approximately 100%, the air-fuel ratio at room temperature is often in the flammable range. It is desirable to prevent the fire from entering the fuel tank even if the fire is close to the fuel tank filler.

  Generally, in an automobile, a fuel supply guide cylinder extending upward from a fuel tank is provided with a device such as a shutter that is normally kept closed and opened when a fuel supply gun is inserted into the fuel supply guide cylinder (Patent Document). Therefore, there is no risk of fire entering the fuel tank. However, in motorcycles such as motorcycles, it is not practical to attach a long refueling guide tube to the fuel tank due to the layout of the fuel tank, so it is practically difficult to provide a shutter or the like like an automobile.

Therefore, it is conceivable to install a flame arrester in the refueling guide cylinder to prevent fire from entering the fuel tank. However, assuming that fire has entered the refueling guide cylinder, The arrangement structure around the cylinder is required to take into consideration that the gas containing fuel in the fuel tank does not flow out to the fuel supply guide cylinder side.
JP 2001-138755 A

  The present invention has been made in view of such circumstances, and not only uses a flame arrester to suppress the intrusion of fire from the fuel inlet into the fuel tank, but also from the upper part in the fuel tank. An object of the present invention is to provide a fuel tank filler device for a vehicle fuel tank that prevents the transfer of ethanol gas to the vehicle.

  In order to achieve the above object, the present invention is provided with an oil supply port on an upper wall of a vehicle fuel tank that stores ethanol fuel as an engine fuel, and an oil supply guide tube extending from the fuel supply port into the fuel tank. In a fuel tank filler device for a vehicle, a flame arrester that covers the lower opening of the fuel guide cylinder and allows the fuel to flow while preventing the intrusion of fire, and a lower part from the outer peripheral edge of the flame arrester The first feature is that a skirt extending to the side is provided.

  In addition to the first feature, the present invention has a second feature that the skirt is formed in a cylindrical shape so as to surround the flame arrester over the entire circumference.

  In addition to the second feature of the present invention, the flame arrestor is formed so as to have a hollow portion having an open upper surface, and the skirt is formed so as to extend below the lower surface of the flame arrester. This is the third feature.

  Furthermore, in addition to the third feature of the present invention, the fourth feature is that the axial length of the skirt is set to be approximately twice or more the axial length of the flame arrester.

  According to the first feature of the present invention, when the tank cap is removed, even if a fire enters the fuel supply guide cylinder, the flame arrester that covers the fuel supply guide cylinder from the bottom prevents the passage of the fire. A blocking effect can be expected, which makes it possible to use a relatively short oil supply guide tube.

  In addition, the fuel supply guide cylinder is provided with a skirt that extends downward from the outer peripheral edge of the flame arrester, so that the convection of air generated through the flame arrester between the fuel guide cylinder and the upper part of the fuel tank It is possible to prevent more effectively. Therefore, even if ethanol fuel gas is present in the upper part of the fuel tank, the transfer of ethanol gas to the fuel supply guide cylinder due to convection can be more effectively suppressed.

  According to the second aspect of the present invention, since the flame arrester is surrounded by the cylindrical skirt over the entire circumference, the air generated between the fuel supply guide cylinder and the upper part of the fuel tank via the flame arrester can be reduced. Convection can be effectively prevented by the cylindrical skirt.

  According to the third feature of the present invention, since the flame arrester having a hollow portion whose upper surface is opened can secure a wide fluid flow area, the fuel arrester flows from the fuel supply guide cylinder to the fuel tank side during fueling. The fuel and the air discharged from the fuel tank to the refueling guide cylinder are exchanged smoothly, which can contribute to speeding up of refueling. In addition, since the skirt is extended below the lower surface of the flame arrester, the exchange of fuel and air in the flame arrester is enhanced, and the convection between the fuel supply guide cylinder and the fuel tank generated through the flame arrester is effectively prevented. Can be prevented.

  According to the fourth aspect of the present invention, the occurrence of the convection can be more effectively prevented by setting the axial length of the skirt to approximately twice or more the axial length of the flame arrester.

  Hereinafter, embodiments of the present invention will be described based on preferred examples shown in the accompanying drawings.

  FIG. 1 is a side view of a motorcycle equipped with a fuel tank equipped with a fuel filler apparatus according to a first embodiment of the present invention, FIG. 2 is a longitudinal side view of a fuel filler apparatus portion of the fuel tank of FIG. 1, and FIG. FIG. 4 is a cross-sectional view taken along line 4-4 of FIG. 3, FIG. 5 is a view corresponding to FIG. 3, and FIG. 6 is a line 6-6 of FIG. FIG. 7 is a cross-sectional view, FIG. 7 shows a third embodiment of the present invention, a view corresponding to FIG. 3, FIG. 8 is a cross-sectional view taken along line 8-8 of FIG. FIG. 10 is a cross-sectional view taken along line 11-11 of FIG. 9, FIG. 11 is a view corresponding to FIG. 3, and FIG. 12 is a cross-sectional view taken along line 12-12 of FIG. FIGS. 13A and 13B show a sixth embodiment of the present invention, a diagram corresponding to FIG. 3, FIG. 14 a sectional view taken along line 14-14 of FIG. 13, and FIG. 15 shows a seventh embodiment of the present invention. FIG. 16 is a diagram corresponding to FIG. 16 is a sectional view taken along line 16, FIG. 17 shows an eighth embodiment of the present invention, corresponding to FIG. 15, FIG. 18 is a sectional view taken along line 18-18 in FIG. 17, and FIG. 19 is a ninth embodiment according to the present invention. FIG. 20 is a sectional view taken along the line 20-20 of FIG. 19, FIG. 21 is a diagram showing a tenth embodiment of the present invention, a diagram corresponding to FIG. 11, and FIG. 22 is an eleventh embodiment of the present invention. FIG. 23 is a diagram corresponding to FIG. 4 showing an twelfth embodiment of the present invention.

  First, the description starts with the description of the first embodiment of the present invention shown in FIGS.

  In FIG. 1, a body frame 1 of a motorcycle M includes a head pipe 1h that supports a front fork 2 so as to be steerable, and a main frame 1m that extends substantially horizontally rearward from the head pipe 1h and then bends downward. , A seat rail 1s extending substantially horizontally rearward from the rear end of the horizontal portion of the main frame 1m, and a down tube 1d extending obliquely downward from the head pipe 1h. A fuel tank is mounted on the main frame 1m. 3, a power unit 6 including an engine 5 that is disposed on the seat rail 1s and is arranged immediately below the fuel tank 3 includes a down tube 1d and a downward bending of the main frame 1m. Mounted between the parts. The front wheel 7 is pivotally supported by the lower end of the front fork 2, and the rear wheel 8 driven from the power unit 6 via the chain 9 is a rear fork 10 supported by the lower end of the main frame 1m so as to be swingable up and down. A rear cushion 11 is interposed between the rear fork 10 and the seal rail 1s.

  As shown in FIGS. 2 and 3, the fuel tank 3 stores ethanol fuel as an engine fuel, and an upper wall 3a has a fuel supply guide tube 15 penetrating therethrough. Closely welded. An upper end portion of the fuel supply guide cylinder 15 protruding from the upper surface of the fuel tank 3 is bent over the entire circumference by 180 ° into the fuel supply guide cylinder 15 to form a fuel supply port 15a. The fuel filler port 15a is normally closed by a tank cap 16. However, if the tank cap 16 is removed during refueling, the fuel gun G can be inserted into the fuel guide cylinder 15 as shown in FIG. It has become.

  Most of the fuel supply guide cylinder 15 enters the fuel tank 3, and a flame arrester assembly 17 is attached to the periphery of the lower end portion thereof.

  After the assembly 17 is manufactured, the flame arrester assembly 17 is welded to an annular attachment plate 18 that is attached to the periphery of the lower end portion of the oil supply guide cylinder 15 via a welded portion 19, and a lower surface of the attachment plate 18. A gun stopper 20 disposed so as to cross the lower opening of the oil supply guide cylinder 15 and an oil supply guide cylinder that is coupled to the lower surface of the mounting plate 18 radially outward from the gun stopper 20 and accommodates the gun stopper 20. The flame arrestor 21 covers the lower end opening of the cylinder 15 and the cylindrical arrester 21 that houses the flame arrester 21 and extends downward therefrom.

  Specifically, as shown in FIGS. 3 and 4, the flame arrester 21 is composed of two strip plate members 22, 22, which cross the lower opening of the fuel supply guide cylinder 15. The main part 22a to be arranged is disposed along the axial direction of the oil supply guide tube 15 and is welded so as to overlap each other. Then, support pieces 22b and 22b are formed on one end of one band plate member 22 and the other end of the other band plate member 22 so as to be superimposed on the lower surface of the attachment plate 18, and these support pieces 22b and 22b are attached to the attachment plate 18. Welded to the lower surface of each. Protrusions 24, 24 that protrude outwardly and have recesses 23, 23 on the inside are bent at the portions of both strip members 22, 22 located on the axis of the oil supply guide cylinder 15. 24 are arranged such that both concave portions 23, 23 inside thereof form a single passage 25 facing each other. By doing so, both the strip plate members 22 and 22 have compatibility with each other, and can be constituted by the same parts. In addition, although each said protrusion 24 was formed in semicircle shape in the example of illustration, it can be formed in other shapes, such as V shape and U shape.

  The flame arrester 21 allows the passage of fuel, but prevents the passage of fire. In the illustrated example, the flame arrester 21 is made of a galvanized wire mesh, the wire diameter is 0.28 mm, and the number of meshes is 1. 16 per square inch. The flame arrester 21 has a bowl-like shape with an open upper surface so as to define a hollow portion 15 a for accommodating the gun stopper 20, and a radially outward flange 26 is formed at the upper end of the flame arrester 21. In the case of the illustrated example, the bowl shape of the flame arrester 21 is constituted by a part of a spherical surface. The skirt 27 accommodates the flame arrestor 21 and has a cylindrical shape extending downward from the skirt 27. A flange 28 is formed at the upper end of the skirt 27, and the lower end of the skirt 27 expands downward. A funnel portion 27a is formed.

  Thus, after the flange 26 and the flange 28 are overlapped with each other and on the lower surface of the mounting plate 18, the mounting plate 18 and the outer periphery of the mounting plate 18 are bent downward and radially inward. The flame arrester assembly 17 is configured by sandwiching the flanges 26 and 28 with the crimped portion 18a. After the configuration of the flame arrester assembly 17, the mounting plate 18 is welded to the lower end portion of the oil supply guide tube 15.

  As shown in FIG. 3, a first vent hole 29 is provided in the upper part of the peripheral wall of the oil supply guide cylinder 15, and the second vent hole 30 is provided in the upper part of the peripheral wall of the skirt 27. Is provided. At this time, the second ventilation holes 30 are formed with a diameter larger than that of the first ventilation holes 29 or a larger number than the first ventilation holes 29.

  Next, the operation of the first embodiment will be described.

  When the tank cap 16 is removed, even if a fire such as a spark enters the fuel supply guide cylinder 15, the flame arrester 21 can be expected to prevent the passage of the fire.

  In addition, a skirt 27 is provided at the lower end of the fuel supply guide cylinder 15 so as to extend downward while surrounding the flame arrester 21 over the entire circumference. The skirt 27 can prevent air convection that occurs through the flame arrestor 21.

  Thus, in order to more effectively prevent the convection by the skirt 27, a funnel portion 27a whose diameter is expanded downward is provided at the lower end portion of the skirt 27, or the axial length of the skirt 27 is framed. It is effective to set the arrester 21 to approximately twice or more the axial length.

  On the other hand, when refueling the fuel tank 3, even if the refueling gun G is randomly inserted into the refueling guide cylinder 15 from the refueling port 15a, the tip of the refueling gun G is disposed above the flame arrester 21. The contact between the fuel gun G and the flame arrester 21 can be prevented. As described above, the insertion depth of the fuel gun G into the fuel guide cylinder 15 is regulated by the gun stopper 20 so that the relatively short fuel guide cylinder 15 can be used and the flame arrester 21 is protected. Can be achieved.

  Further, since the flame arrester 21 has a bowl shape larger in diameter than the fuel supply guide cylinder 15, it is possible to secure a wide fluid flow area, and when fueling, the flame arrester 21 flows into the fuel tank 3 side from the fuel supply guide cylinder 15. The fuel to be exchanged and the air discharged from the fuel tank 3 toward the fuel supply guide cylinder 15 are smoothly exchanged, so that the fuel supply can be speeded up.

  In addition, the flame arrester 21 having a bowl-like shape with an open upper surface has a hollow portion 15a extending downward from the lower end of the oil supply guide tube 15, and the gun stopper 20 is disposed in the hollow portion 15a, thereby increasing space efficiency. The gun stopper 20 and the flame arrester 21 can be compactly attached to the lower end portion of the oil supply guide tube 15. In addition, since the gun stopper 20 in the hollow portion 15a occupies the lower position of the fuel supply guide cylinder 15, the reduction of the flow area of the fuel supply guide cylinder 15 by the gun stopper 20 is suppressed, and the fuel flow is comprehensively performed. Resistance can be reduced and refueling can be speeded up.

  Further, since the gun stopper 20 is constituted by the strip plate member 22 arranged so that the plate surface is along the axial direction of the fuel supply guide cylinder 15, the gun stopper 20 does not hinder the flow of fuel around the gun stopper 20 and The stopper 20 can be given high strength against the contact impact force of the fuel gun G.

  At that time, in particular, the gun stopper 20 is composed of two strip plate members 22, 22 that have parallel plate surfaces, and each strip plate member 22 projects in the opposite direction and has a recess 23 on the inside. 24 is bent, the strength of the gun stopper 20 can be increased, and a wide contact area of the gun stopper 20 with the fuel gun G can be secured, and the function of the gun stopper 20 can be enhanced.

  Further, the two strip members 22 and 22 constituting the gun stopper 20 are arranged so as to join the plate surfaces to each other and to make the recesses 23 and 23 face each other. By joining the members 22 and 22, the strength of the gun stopper 20 can be effectively increased, and the recesses 23 and 23 facing each other form a fuel flow path, thereby facilitating the passage of fuel. it can. A pair of support pieces 22b, 22b for attaching the gun stopper 20 to the mounting plate 18 by joining the two strip members 22, 22 are formed at one end of the two strip members 22, 22 opposite to each other. The mounting structure of the gun stopper 20 can be simplified.

  A first vent hole 29 is provided in the upper part of the peripheral wall of the oil supply guide cylinder 15, and a second vent hole 30 is provided in the upper part of the peripheral wall of the skirt 27, and the diameter of the second communication hole 30 is larger than that of the first vent hole 29. As the fuel tank 3 is refueled, the fuel oil level in the fuel tank 3 has risen above the level of the lower end surface of the skirt 27. In some cases, the air in the upper part of the fuel tank 3 smoothly passes through the first and second vent holes 29 and 30 and flows out to the outside, so that a decrease in the fuel supply speed to the fuel tank 3 can be prevented. Further, when the fuel oil level in the fuel tank 3 rises above the level of the second ventilation hole 30, the outflow of the air in the upper part of the fuel tank 3 to the outside is restricted by the first ventilation hole 29. Along with this, the level of the fuel oil in the fuel supply guide cylinder 15 rises rapidly, and the refueling operator knows that the fuel is full in the fuel tank 3 by seeing the state, and finishes the refueling operation. Thereafter, the air in the upper part of the fuel tank 3 gradually flows out to the outside through the first vent hole 29, so that the fuel oil level in the fuel supply guide cylinder 15 gradually decreases, It becomes the same level as the fuel oil level. Thus, supercharging to the fuel tank 3 can be prevented.

  In such a fuel tank filling device for a vehicle fuel tank, a gun stopper 20 is welded to a mounting plate 18 and a flame arrester 21 and a skirt 27 are caulked and joined to form a flame arrester assembly 17, and the mounting plate 18 is connected to the lower end portion of the oil supply guide cylinder 15 by welding, so that the flame arrester assembly 17 can be easily manufactured without being interfered with the oil supply guide cylinder 15 to improve productivity. Can contribute.

  Next, a second embodiment of the present invention shown in FIGS. 5 and 6 will be described.

  In the second embodiment, a pair of support pieces 22b and 22b are formed at both ends of the two band plate members 22 and 22 constituting the gun stopper 20, and the protrusions 24 and 24 of the band plate members 22 and 22 are formed. Are offset in the opposite directions from the axis of the oil supply guide cylinder 15, the two strip plate members 22, 22 are separated from each other, and a pair of support pieces 22 b, 22 b are welded to the lower surface of the mounting plate 18. Since the other configuration is the same as that of the previous embodiment, the same reference numerals are assigned to the portions corresponding to those of the previous embodiment in FIGS.

  According to the second embodiment, the number of support pieces 22b of the band plate members 22 and 22 constituting the gun stopper 20 is increased as compared with the previous embodiment, but the contact region of the gun stopper 20 with respect to the fuel gun G is reduced. Can be widely obtained.

  Next, in the third embodiment of the present invention shown in FIGS. 7 and 8, the pair of support pieces 22b, 22b of the two strip plate members 22, 22 constituting the gun stopper 20 of the first embodiment is lubricated. These are formed along the inner peripheral surface of the guide cylinder 15 and are fixed to the lower inner peripheral surface of the oil supply guide cylinder 15 by welding. Since the other configuration is the same as that of the first embodiment, the same reference numerals are given to the portions corresponding to those of the first embodiment in FIGS. 7 and 8, and the duplicate description is omitted.

  In the case of this third embodiment, the flame arrester assembly 17 is composed of a mounting plate 18, a flame arrester 21, and a skirt 27.

  Next, a fourth embodiment of the present invention shown in FIGS. 9 and 10 will be described.

  In the third embodiment, the two band plate members 22 and 22 constituting the gun stopper 20 are provided with a main portion 22a having an inverted V-shaped cross section projecting upward and downward from both ends of the main portion 22a. A pair of flat plate-like support pieces 22b and 22b which are bent in a straight line are provided, and the two strip plate members 22 and 22 cross each other in a cross shape when the main portions 22a are viewed from above the fuel supply guide cylinder 15. The support pieces 22 b and 22 b are attached to the lower inner peripheral surface of the oil supply guide tube 15 by welding. Since the structure other than the gun stopper 20 is the same as that of the first embodiment, the same reference numerals are given to the portions corresponding to those of the first embodiment in FIGS. Omitted.

  According to the fourth embodiment, the two band plate members 22, 22 constituting the gun stopper 20 are arranged in a cross shape in a cross shape when viewed from above in the fuel supply guide cylinder 15. It is possible to obtain a wide contact area with respect to the fuel gun G. In addition, since the main portion 22a of the strip plate members 22 and 22 traversing the fuel supply guide cylinder 15 is provided with an inverted V-shaped cross section that is convex upward, the strip plate members 22 and 22 are provided. In addition, the fuel flowing into the fuel supply guide cylinder 15 can flow smoothly along the outer slopes of the strip plate members 22 and 22 to reduce the flow resistance of the fuel. Speed can be achieved.

  Next, a fifth embodiment of the present invention shown in FIGS. 11 and 12 will be described.

  In the fifth embodiment, the two band plate members 22 and 22 constituting the gun stopper 20 have a main portion 22a having an inverted V-shaped cross section projecting upward, and upward from both ends of the main portion 22a. A pair of flat plate-like support pieces 22b and 22b that are bent in a straight line are provided, and the two band plate members 22 and 22 have a frame-like shape in which the main portions 22a are arranged in parallel at regular intervals. Arranged in the hollow portion 15 a of the arrester 21, support pieces 22 b and 22 b are attached to the lower inner peripheral surface of the oil supply guide tube 15 by welding. Since the structure other than the gun stopper 20 is the same as that of the first embodiment, the same reference numerals are given to the portions corresponding to those of the first embodiment in FIGS. Omitted.

  According to the fifth embodiment, the same effect as that of the fourth embodiment can be achieved, and the main portion 22a of each of the strip plate members 22 and 22 has a larger diameter than that of the fuel supply guide tube 15. By disposing in the hollow portion 15a, it is possible to suppress a decrease in the flow passage area of the fuel supply guide cylinder 15 due to the gun stopper 20, and to reduce the fuel flow resistance comprehensively.

  Next, a sixth embodiment of the present invention shown in FIGS. 13 and 14 will be described.

  In this sixth embodiment, the gun stopper 20 is composed of two round bar members 32, 32, and these round bar members 32, 32 are arranged in parallel at a predetermined distance from each other in the fuel supply guide cylinder 15. The support pieces 32a, 32a; 32a, 32a, which are arranged so as to cross the lower portion of the oil supply and are bent downward or upward at both ends, are attached to the lower inner peripheral surface of the oil supply guide tube 15 by welding. Since the structure other than the gun stopper 20 is the same as that of the first embodiment, the same reference numerals are assigned to the portions corresponding to those of the first embodiment in FIGS. Omitted.

  According to the sixth embodiment, each of the round bar members 32, 32 has a circular cross-sectional shape, so that the bending strength is high and the fuel flowing into the fuel supply guide cylinder 15 is allowed to flow into each round bar member 32, 32. The fuel can flow down along a smooth cylindrical surface, reducing the flow resistance of the fuel and speeding up the refueling.

  Next, a seventh embodiment of the present invention shown in FIGS. 15 and 16 will be described.

  In the seventh embodiment, a gun stopper 20 comprising a disk portion 34 and an annular wall portion 35 bent downward from the outer peripheral edge of the disk portion 34 is attached to the mounting plate 18 of the flame arrester assembly 17. 18, and a plurality of through holes 36, 36... Permitting the passage of the fuel flowing into the fuel supply guide cylinder 15. The annular wall portion 35 is fitted to the inner peripheral surface of the lower end portion of the oil supply guide tube 15. Since the configuration other than the gun stopper 20 is the same as that of the first embodiment, the same reference numerals are given to the portions corresponding to those of the first embodiment in FIGS. Omitted.

  According to the seventh embodiment, the attachment of the mounting plate 18 of the flame arrester assembly 17 and the gun stopper 20 inevitably eliminates a special process of attaching the gun stopper 20 to the mounting plate 18. In addition, the annular wall portion 35 of the gun stopper 20 is fitted to the inner peripheral surface of the lower end portion of the oil supply guide tube 15, so that the coaxial accuracy between the oil supply guide tube 15 and the flame arrester assembly 17 can be easily increased. Further, the annular wall portion 35 contributes to strengthening the rigidity of the gun stopper 20 and not only prevents deformation due to the contact impact of the fuel gun G, but also a welded portion between the fuel supply guide tube 15 and the mounting plate 18 due to the deformation. 19 can be prevented from being generated and contribute to improving the durability of the welded portion 19.

  Next, in an eighth embodiment of the present invention shown in FIGS. 17 and 18, in the seventh embodiment, a large number of annular ribs projecting downward from the peripheral edges of the many through holes 36, 36. 37, 37... Are formed in FIG. 17 and FIG. 18, and the same reference numerals are assigned to the portions corresponding to those of the seventh embodiment, and redundant description is omitted.

  According to the eighth embodiment, the annular ribs 37, 37 at the peripheral edges of the through holes 36, 36... Further increase the rigidity of the disk-shaped gun stopper 20, and the fuel passing through the through holes 36, 36. The flow is smoothly guided downward.

  Next, a ninth embodiment of the present invention shown in FIGS. 19 and 20 will be described.

  In the ninth embodiment, when the flame arrester assembly 17 of each of the above embodiments is configured, a plurality of members, that is, the mounting plate 18, the flange 26 of the flame arrester 21 and the flange 28 of the skirt 27, are used in place of the caulking connection. These are joined by a welding nut 40 and a bolt 41. In this case, the gun stopper 20 is attached to the lower surface of the attachment plate 18 as in the first embodiment of FIG. Since other configurations are the same as those of the first embodiment, portions corresponding to those of the first embodiment in FIG. 19 and FIG. 20 are denoted by the same reference numerals, and redundant description is omitted.

  Next, a description will be given of a tenth embodiment of the present invention shown in FIG.

  In the tenth embodiment, the lower end of the oil supply guide cylinder 15 is continuously provided with a tapered portion 43 whose diameter is increased downward or a large diameter cylindrical portion 43 ′ having a larger diameter than the oil supply guide cylinder 15. Similar to the fifth embodiment shown in FIGS. 11 and 12, the two band plate members 22 and 22 constituting the gun stopper 20 are provided with a main portion 22a having an inverted V-shaped cross section projecting upward, A pair of flat plate-like support pieces 22b and 22b that are bent upward from both ends of the main portion 22a are provided. The two strip members 22 and 22 are parallel to each other with a predetermined interval between the main portions 22a. While being arranged in the tapered portion 43 or the large diameter cylindrical portion 43 ′, the support pieces 22 b and 22 b are welded to the lower inner peripheral surface of the oil supply guide tube 15.

  A mounting flange 44 and a caulking portion 45 connected to the outer peripheral end thereof are integrally connected to the lower end of the tapered portion 43 or the large-diameter cylindrical portion 43 ′, and a metal mesh plate-like frame is formed on the lower surface of the mounting flange 44. The arrester 21 and the flange 28 at the upper end of the skirt 27 are sequentially overlapped and the caulking portion 45 is caulked to couple the flame arrester 21 and the skirt 27 to the tapered portion 43 or the large diameter cylindrical portion 43 ′.

  According to the tenth embodiment, the tapered portion 43 or the large-diameter cylindrical portion 43 ′ is connected to the lower end of the oil supply guide tube 15, so that the plate-shaped flame arrester 21 having a larger diameter than the oil supply guide tube 15 is used. Thus, the flow resistance of the flame arrester 21 to the fuel can be reduced. In addition, the main portion 22a of each strip member 22, 22 of the flame arrester 21 is disposed in the tapered portion 43 or the large-diameter cylindrical portion 43 'wider than in the oil supply guide tube 15, so that the oil supply guide tube by the gun stopper 20 is provided. The reduction of the flow area of 15 can be suppressed, and the fuel flow resistance can be reduced overall.

  Next, an eleventh embodiment of the present invention shown in FIG. 22 will be described.

  In the eleventh embodiment, a mounting flange 47 and a caulking portion 48 connected to the outer peripheral end thereof are integrally connected to the lower end portion of the oil supply guide cylinder 15, and the upper surface of the mounting flange 47 has a bowl shape with an open top surface. The flame arrester 21 and the skirt 27 are attached to the fuel supply guide cylinder 15 by sequentially overlapping the flange 26 of the flame arrester 21 and the flange 28 of the skirt 27 and caulking the caulking portion 48. In this case, the gun stopper 20 is attached in advance to the inner peripheral surface of the lower end portion of the oil supply guide tube 15 as in the fourth embodiment of FIGS. Since the other configuration is the same as that of the fourth embodiment, portions corresponding to those of the fourth embodiment in FIG. 22 are denoted by the same reference numerals, and redundant description is omitted.

  According to the eleventh embodiment, the gun stopper 20 and the skirt 27 can be coupled to the oil supply guide tube 15 by the mounting flange 47 and the caulking portion 48 at the lower end portion of the oil supply guide tube 15, as in the first embodiment. The simple mounting plate 18 can be omitted, and the structure and processing can be simplified.

  Finally, a twelfth embodiment of the present invention shown in FIG. 23 will be described.

  In the twelfth embodiment, a connecting cylindrical portion 50 is formed at the upper end portion of a flame arrester 21 having a bowl-like shape with an open top surface, and the connecting cylindrical portion 50 and the upper end portion of the skirt 27 fitted to the outer peripheral surface thereof are connected. The connecting cylinder portion 50 and the skirt 27 are both coupled to the lower end portion of the oil supply guide tube 15 via the welded portion 51 by fitting to the outer peripheral surface of the lower end portion of the oil supply guide tube 15. Also in this case, the gun stopper 20 is attached in advance to the inner peripheral surface of the lower end portion of the oil supply guide tube 15 as in the fourth embodiment of FIGS. Since the other configuration is the same as that of the fourth embodiment, portions corresponding to those of the fourth embodiment in FIG. 22 are denoted by the same reference numerals, and redundant description is omitted.

  According to the twelfth embodiment, the gun stopper 20 and the skirt 27 can be coupled to the oil supply guide cylinder 15 by the same weld 51, and the mounting plate 18 as in the first embodiment is omitted, and the structure In addition, the processing can be simplified.

  As mentioned above, although the Example of this invention was described, this invention is not limited to the said Example, A various design change can be performed in the range which does not deviate from the summary of this invention. For example, the number of the strip plate members 22 and the round bar members 32 constituting the gun stopper 20 is not limited to two, and is appropriately selected according to the thickness of the oil supply guide tube 15.

1 is a side view of a motorcycle equipped with a fuel tank including a fuel filler apparatus according to a first embodiment of the present invention. FIG. 2 is a longitudinal side view of a fuel filler device portion of the fuel tank of FIG. 1. The principal part enlarged view of FIG. FIG. 4 is a sectional view taken along line 4-4 of FIG. FIG. 4 is a diagram corresponding to FIG. 3 showing a second embodiment of the present invention. FIG. 6 is a sectional view taken along line 6-6 of FIG. FIG. 4 is a view corresponding to FIG. 3 showing a third embodiment of the present invention. FIG. 8 is a cross-sectional view taken along line 8-8 in FIG. FIG. 6 is a view corresponding to FIG. 3 showing a fourth embodiment of the present invention. FIG. 11 is a sectional view taken along line 11-11 in FIG. 9; FIG. 6 is a view corresponding to FIG. 3 showing a fifth embodiment of the present invention. 12-12 sectional view taken on the line of FIG. FIG. 6 is a view corresponding to FIG. 3 showing a sixth embodiment of the present invention. FIG. 14 is a sectional view taken along line 14-14 of FIG. FIG. 10 is a view corresponding to FIG. 3 showing a seventh embodiment of the present invention. FIG. 16 is a sectional view taken along line 16-16 in FIG. 15; FIG. 16 is a view corresponding to FIG. 15 showing an eighth embodiment of the present invention. FIG. 18 is a cross-sectional view taken along line 18-18 in FIG. FIG. 10 is a view corresponding to FIG. 3 showing a ninth embodiment of the present invention. FIG. 20 is a sectional view taken along line 20-20 in FIG. FIG. 12 is a view corresponding to FIG. 11 showing a tenth embodiment of the present invention. FIG. 5 is a view corresponding to FIG. 4 showing an eleventh embodiment of the present invention. FIG. 14 is a view corresponding to FIG. 3 showing a twelfth embodiment of the present invention.

Explanation of symbols

3 .... Fuel tank 3a for storing ethanol fuel ... Upper wall 15 ... Refueling guide cylinder 15a ... Refueling port 21 ... Flame arrestor 21a ... -Hollow area 27 of flame arrestor ... Skirt

Claims (4)

A fuel supply port (15a) is formed in an upper wall (3a) of a vehicle fuel tank (3) storing ethanol fuel as an engine fuel, and a fuel supply guide tube (15) extending from the fuel supply port (15a) into the fuel tank (3). In the fuel tank filler port device for vehicles,
A flame arrester (21) that covers the lower opening of the fuel supply guide cylinder (15) to allow the fuel to flow while preventing the intrusion of fire, and downward from the outer peripheral edge of the flame arrester (21). A fuel filler device for a fuel tank for a vehicle, comprising an extending skirt (27). The fuel tank filler device for a vehicle fuel tank according to claim 1,
A fuel filler device for a fuel tank for a vehicle, wherein the skirt (27) is formed in a cylindrical shape so as to surround the flame arrester (21) over the entire circumference. The vehicle fuel tank filler port device according to claim 2,
The flame arrester (21) is formed so that it has a hollow part (21a) whose upper surface is open, while the skirt (27) is formed so that it extends below the lower surface of the flame arrester (21). A fuel filler device for a fuel tank for vehicles. The fuel tank filler device for a vehicle fuel tank according to claim 3,
A fuel filler apparatus for a fuel tank for a vehicle, wherein an axial length of the skirt (27) is set to be approximately twice or more an axial length of the flame arrester (21).

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