WO2015040715A1 - 鞍乗り型車両および燃料ストレーナ - Google Patents
鞍乗り型車両および燃料ストレーナ Download PDFInfo
- Publication number
- WO2015040715A1 WO2015040715A1 PCT/JP2013/075310 JP2013075310W WO2015040715A1 WO 2015040715 A1 WO2015040715 A1 WO 2015040715A1 JP 2013075310 W JP2013075310 W JP 2013075310W WO 2015040715 A1 WO2015040715 A1 WO 2015040715A1
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- Prior art keywords
- fuel
- pipe
- water
- mesh portion
- mesh
- Prior art date
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Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
- F02M37/00—Apparatus or systems for feeding liquid fuel from storage containers to carburettors or fuel-injection apparatus; Arrangements for purifying liquid fuel specially adapted for, or arranged on, internal-combustion engines
- F02M37/22—Arrangements for purifying liquid fuel specially adapted for, or arranged on, internal-combustion engines, e.g. arrangements in the feeding system
- F02M37/32—Arrangements for purifying liquid fuel specially adapted for, or arranged on, internal-combustion engines, e.g. arrangements in the feeding system characterised by filters or filter arrangements
- F02M37/50—Filters arranged in or on fuel tanks
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
- F02M37/00—Apparatus or systems for feeding liquid fuel from storage containers to carburettors or fuel-injection apparatus; Arrangements for purifying liquid fuel specially adapted for, or arranged on, internal-combustion engines
- F02M37/22—Arrangements for purifying liquid fuel specially adapted for, or arranged on, internal-combustion engines, e.g. arrangements in the feeding system
- F02M37/24—Arrangements for purifying liquid fuel specially adapted for, or arranged on, internal-combustion engines, e.g. arrangements in the feeding system characterised by water separating means
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
- F02M37/00—Apparatus or systems for feeding liquid fuel from storage containers to carburettors or fuel-injection apparatus; Arrangements for purifying liquid fuel specially adapted for, or arranged on, internal-combustion engines
- F02M37/22—Arrangements for purifying liquid fuel specially adapted for, or arranged on, internal-combustion engines, e.g. arrangements in the feeding system
- F02M37/32—Arrangements for purifying liquid fuel specially adapted for, or arranged on, internal-combustion engines, e.g. arrangements in the feeding system characterised by filters or filter arrangements
- F02M37/34—Arrangements for purifying liquid fuel specially adapted for, or arranged on, internal-combustion engines, e.g. arrangements in the feeding system characterised by filters or filter arrangements by the filter structure, e.g. honeycomb, mesh or fibrous
Definitions
- the present invention relates to a saddle-ride type vehicle having a fuel strainer in a fuel tank and a fuel strainer.
- a structure in which a fuel strainer is provided in a fuel tank for storing fuel such as gasoline is known for a saddle-ride type vehicle such as a motorcycle (see, for example, Patent Document 1).
- a suction pipe communicating with the inside of the fuel tank is provided, and a mesh-like filter (hereinafter referred to as a mesh portion) is provided over the upper and lower sides of the suction pipe. It is described to supply the fuel injected into the pipe to the fuel injection pump.
- condensation may occur in the fuel tank due to the temperature difference between the inside and the outside of the fuel tank, and water may be accumulated in the fuel tank.
- Water has a higher surface tension than fuel, so fuel can pass through the mesh portion more easily than water. Therefore, fuel may pass through the mesh portion, and water may remain in the fuel tank and gradually increase.
- the present invention has been made in view of the above-described circumstances, and an object thereof is to provide a saddle-ride type vehicle and a fuel strainer capable of reducing water remaining in a fuel tank.
- the present invention comprises a fuel tank (11) for storing fuel, and a fuel strainer (24) provided in the fuel tank (11), the fuel strainer (24) comprising A pipe portion (31) extending upward from a tank bottom plate (11A), and a mesh portion (32) provided in the pipe portion (31) and filtering the fuel to flow into the pipe portion (31)
- the pipe portion (31) of the fuel strainer (24) has a closed portion (31Y) to which the fuel does not flow over the entire circumference in the vicinity of the tank bottom plate (11A)
- a lower mesh portion (32B2) functioning as a part of the mesh portion (32) is provided below the closed portion (31Y).
- the lower mesh portion when the water is accumulated to the lower end of the closed portion (31Y) in the vicinity of the tank bottom plate (11A) and the fuel level above the water is lowered above the closed portion (31Y), the lower mesh portion The head pressure of the water and the fuel acts as a force that causes the water to pass through the lower mesh portion (32B2) because it can not pass through (32B2).
- water can be discharged from the fuel tank by passing through the lower mesh portion, and water remaining in the fuel tank can be reduced.
- the fuel has a specific gravity smaller than that of water and that it is easier to pass through the mesh portion (32) than water. According to this configuration, it is possible to push out the water which is easily accumulated below the fuel and which is difficult to pass through the mesh portion, toward the mesh portion by effectively using the head pressure of the fuel.
- the pipe portion (31), as the mesh portion (32), is a first mesh into which fuel flows above an upper limit position defining an upper limit of the spare fuel in the fuel tank (11).
- the closed portion and the lower mesh portion can be provided in the vicinity of the tank bottom plate without changing the upper limit position of the reserve fuel.
- the pipe portion (31) includes a first pipe (41) into which the fuel having passed through the first mesh portion (32A) flows and a fuel having passed through the second mesh portion (32B). And a second pipe line (42) into which the gas flows, and at the lower part of the pipe section (31), either the first pipe line (41) or the second pipe line (42) on the engine (12) side
- the fuel cock (23) may be provided to switch to. According to this configuration, it is possible to switch to the spare fuel by the fuel cock, prevent dust and the like from flowing into the fuel cock, and only one mounting portion of the fuel tank is required.
- the pipe portion (31) is another closed portion between the first mesh portion (32A) and the second mesh portion (32B), in which the fuel does not flow over the entire circumference. (31X), and a sealing member (43) may be provided between the inner surface of the other closed portion (31X) and the first conduit (41).
- the upper mesh portion and the lower mesh portion are not used simultaneously, and both are not simultaneously blocked by dust or the like.
- the head pressure of water and fuel can be made to act as a force that causes water to pass through the upper mesh part, thereby increasing the opportunity for water discharge. be able to.
- a boss (15) protruding downward from the tank bottom plate (11A) is provided, the pipe (31) passes through the inside of the boss (15), and the boss (15)
- a fuel reservoir (51) may be provided between the pipe portion (31) and the fuel in the fuel tank (11).
- the present invention is provided in a pipe portion (31) extending upward from a tank bottom plate (11A) in a fuel tank (11) for storing fuel, and the pipe portion (31), and filtering the fuel to obtain the pipe
- the fuel strainer having a mesh portion (32) to be introduced into the portion (31)
- the fuel is spread over the entire circumference at a position corresponding to the vicinity of the tank bottom plate (11A) in the pipe portion (31)
- It is characterized in having a closed portion (31Y) which does not flow in and a lower mesh portion (32B2) which functions as a part of the mesh portion (32) below the closed portion (31Y). According to this configuration, it is possible to reduce water remaining in the fuel tank.
- the pipe portion of the fuel strainer provided in the fuel tank has a closed portion in the vicinity of the tank bottom plate to which the fuel does not flow over the entire circumference, and also below the closed portion. Since the lower mesh portion that functions as a part of the mesh portion that filters the fuel to flow into the pipe portion, it is possible to reduce the water remaining in the fuel tank. In addition, if the fuel has a specific gravity smaller than that of water and it is easier for the fuel to pass through the mesh portion than water, water that tends to easily accumulate below the fuel and does not easily pass through the mesh portion is used effectively. And can be pushed out toward the mesh part.
- the mesh portion As the mesh portion, a first mesh portion into which the fuel flows in above the upper limit position defining the upper limit of the spare fuel in the fuel tank, and a fuel which flows below the upper limit position flows in And the second mesh portion is provided on the upper and lower sides of the closed portion, respectively, so that the closed portion and the closed portion in the vicinity of the tank bottom plate are not changed without changing the upper limit position of the preliminary fuel.
- a lower mesh portion can be provided.
- the pipe portion includes a first pipe line into which the fuel having passed through the first mesh part flows in, and a second pipe line into which the fuel having passed through the second mesh part flows in, the lower portion of the pipe part
- the fuel cock is provided to switch any one of the first pipe line and the second pipe pipe to the engine side, switching to the spare fuel can be performed by the fuel cock, and dust etc. do not flow to the fuel cock
- the attachment portion of the fuel tank is only one place.
- the pipe portion has, between the first mesh portion and the second mesh portion, another closed portion to which the fuel does not flow over the entire circumference, and the other closed portion (31X) If a seal member is provided between the inner surface and the first pipeline, both the upper mesh portion and the lower mesh portion can be simultaneously closed with dust and the like, and the opportunity for water discharge can be increased. .
- the fuel tank has a boss portion projecting downward from the tank bottom plate, the pipe portion passes through the inside of the boss portion, and the fuel in the fuel tank is accumulated between the boss portion and the pipe portion.
- the pipe portion provided in the fuel tank has a closed portion in the vicinity of the tank bottom plate to which the fuel does not flow over the entire circumference, and the fuel is provided below the closed portion. Since the lower mesh portion that functions as a part of the mesh portion that is filtered to flow into the pipe portion is included, water remaining in the fuel tank can be reduced.
- FIG. 1 is a view showing a fuel tank of a motorcycle according to a first embodiment together with its peripheral configuration.
- FIG. 2 is an external view of the fuel cock unit.
- FIG. 3 is a side sectional view of the fuel cock unit.
- FIG. 4 is a view for explaining the water discharge from the pipe portion.
- FIG. 5 (A) is a diagram for explaining the water discharge of the reference example, and
- FIG. 5 (B) is a diagram for explaining the water discharge of this embodiment.
- FIG. 6 is a view showing a fuel cock unit used for a motorcycle according to a second embodiment.
- FIG. 1 is a view showing a fuel tank of a motorcycle according to a first embodiment together with its peripheral configuration.
- the fuel tank 11 is a tank for storing fuel (gasoline in the present embodiment) to be supplied to the engine 12 which is an internal combustion engine provided in a motorcycle, and is formed in a tank shape longer in the front and back in comparison with the vertical length It is supported by a body frame that suspends 12.
- a fuel cock unit 21 is attached to the fuel tank 11, and the fuel cock unit 21 is connected to a carburetor 13 which constitutes a part of an intake system of the engine 12 via a fuel hose 22.
- the fuel in the fuel tank 11 is supplied from the fuel cock unit 21 to the carburetor 13 via the fuel hose 22.
- the fuel tank 11 includes a tank bottom plate 11A disposed on a vehicle body frame of a motorcycle, and a tank outer wall 11B covering the tank bottom plate 11A from above and forming a fuel space between the tank bottom plate 11A and the tank bottom plate 11A. And is formed in a metal fuel tank.
- a fuel supply port 11C for supplying fuel into the fuel tank 11 is provided on the upper surface of the fuel tank 11, and a boss portion for attaching the fuel cock unit 21 to the tank bottom plate 11A constituting the lower surface of the fuel tank 11 15 are provided.
- the boss portion 15 is a component joined to the tank bottom plate 11A by welding or the like, has a female screw (not shown) on the outer periphery while projecting downward from the tank bottom plate 11A, and penetrates the tank bottom plate 11A vertically in its inside Through holes.
- the fuel strainer 24 is inserted into the through hole of the boss portion 15 from below, and the mounting nut 26 provided on the fuel cock unit 21 is fastened to the female screw of the boss portion 15, whereby the fuel cock unit 21 is It is attached to the tank 11.
- FIG. 2 is an external view of the fuel cock unit 21, and FIG. 3 is a side sectional view (III-III sectional view of FIG. 2) of the fuel cock unit 21.
- the fuel cock unit 21 includes a fuel cock 23 capable of opening and closing a fuel supply path, a fuel strainer 24 provided at the inlet of the fuel cock 23 for filtering the fuel, and a fuel discharge pipe 25 constituting an outlet of the fuel cock 23. Is equipped.
- the fuel strainer 24 is provided with a resin pipe portion 31 provided in the fuel tank 11 and extending upward from the tank bottom plate 11A, and a mesh portion 32 provided in the fuel intake port of the pipe portion 31. Have.
- the pipe portion 31 has a cylindrical shape extending in the vertical direction, and the upper end of the pipe portion 31 is closed so that fuel does not enter the pipe portion 31 from the area other than the mesh portion 32.
- the mesh portion 32 is formed of a nylon mesh member and functions as a filter portion for filtering fuel. By inserting the mesh portion 32 when resin forming the pipe portion 31, the pipe portion 31 and the mesh portion 32 are integrally formed (insert molding).
- a portion above the predetermined fuel height (indicated by a symbol M1 in the drawing) stores the fuel (main fuel) excluding the spare fuel. It functions as a main tank, and a portion below the fuel height M1 functions as a reserve tank for storing spare fuel.
- the fuel height M1 defines the upper limit position of the reserve fuel in order to define the amount of the reserve fuel, and is hereinafter referred to as the reserve fuel upper limit position M1.
- the mesh portion 32 includes an upper mesh portion 32A provided on the upper side and a lower mesh portion 32B provided on the lower side with reference to the preliminary fuel upper limit position M1. Therefore, the fuel (corresponding to the fuel in the main tank) located above the preliminary fuel upper limit position M1 flows into the pipe portion 31 through the upper mesh portion 32A. Further, the fuel (corresponding to the fuel in the reserve tank) located below the preliminary fuel upper limit position M1 flows into the pipe portion 31 through the lower mesh portion 32B.
- the upper mesh portion 32A and the lower mesh portion 32B are vertically spaced from each other, and between the upper mesh portion 32A and the lower mesh portion 32B of the pipe portion 31 extends over the entire circumference of the pipe portion 31. It is formed in the block part 31X which a fuel does not flow.
- a small diameter pipe portion (first pipe line) 41 having a diameter smaller than that of the pipe portion 31 is disposed inside the pipe portion 31.
- the small diameter pipe portion 41 has an upper end provided at the same height as the preliminary fuel upper limit position M1 and opened, and extends downward and leads to an inlet port (not shown) of the fuel cock 23. Further, the small diameter pipe portion 41 is formed in a cylindrical shape in which only the upper end is open and the peripheral wall is not open. Therefore, the main fuel located above the upper end, that is, the fuel that has passed through the upper mesh portion 32A flows into the small diameter pipe portion 41, and the fuel that has passed through the lower mesh portion 32B does not flow into the small diameter pipe portion 41.
- a clearance 42 is formed between the small diameter pipe portion 41 and the pipe portion 31.
- the clearance 42 is connected to the other inlet port (not shown) of the fuel cock 23 continuously downward.
- the gap 42 is an annular shape extending all around between the small diameter pipe portion 41 and the pipe portion 31 and is formed in a gap extending downward.
- an annular seal member 43 is interposed between the upper end portion of the small diameter pipe portion 41 and the inner surface of the pipe portion 31, and the small diameter pipe portion 41 is positioned by the seal member 43.
- the small diameter pipe portion 41 functions as a first pipeline through which the fuel flowing into the upper mesh portion 32A passes, and the gap 42 between the small diameter pipe portion 41 and the pipe portion 31 passes the lower mesh portion 32B. It functions as a second conduit into which the reserve fuel flows.
- the fuel cock 23 functions as a switching valve that connects either the first pipe line (small diameter pipe part 41) or the second pipe line (the gap 42 between the pipe parts 31 and 41) to the fuel discharge pipe 25. Both the first and second pipe lines function as an open / close valve which is not connected to the fuel discharge pipe 25.
- the fuel cock 23 is connected to the lower portion of the fuel strainer 24 and exposed below the tank bottom plate 11A of the fuel tank 11. More specifically, the fuel cock 23 includes a fuel cock main body 23A connected to a lower portion of the pipe portion 31 and the small diameter pipe portion 41 of the fuel strainer 24, and a cock lever 23B rotatably provided on the fuel cock main body 23A. And have.
- the cock lever 23B is pivotable between an ON position, a RESERVE position (RES position), and an OFF position. Then, when the cock lever 23B is operated to the ON position (23B (ON) in FIG. 2), the small diameter pipe portion (first pipe line) 41 communicates with the fuel discharge pipe 25. Thus, the fuel (main fuel) positioned above the preliminary fuel upper limit position M1 passes through the upper mesh portion 32A and is supplied to the carburetor 13. Further, when the cock lever 23B is operated to the RES position (23B (RES) in FIG. 2), the gap (second pipeline) 42 between the pipe portions 31 and 41 communicates with the fuel discharge pipe 25.
- the fuel located below the preliminary fuel upper limit position M1 passes through the lower mesh portion 32B and is supplied to the carburetor 13. Also, when the cock lever 23B is operated to the OFF position (23B (OFF) in FIG. 2), the fuel flow path between the fuel strainer 24 and the fuel discharge pipe 25 is closed, and the fuel in the fuel tank 11 is It is not supplied to the vaporizer 13.
- condensation may occur in the fuel tank 11 due to the temperature difference between the inside and the outside of the fuel tank 11, and water may be accumulated.
- Water has a surface tension higher than that of fuel, so that the fuel is more likely to pass through the mesh portion 32 than water, and water may remain in the fuel tank 11 and gradually increase. Further, since water has a specific gravity greater than that of fuel, water tends to be accumulated at the bottom of the fuel tank 11, and is separated from gasoline particularly at the time of stopping and accumulated at the bottom of the fuel tank 11.
- FIG. 4 is a view schematically showing the pipe portion 31.
- the fuel passes through the mesh portion 32 and the water does not pass through the mesh portion 32. . That is, the fuel above the liquid level of water preferentially passes through the mesh portion 32.
- the height T1 to T2 is a range in which the following equation (1) is satisfied, and the height less than the height T2 is a range in which the following equation (2) is satisfied.
- height T2 ⁇ height T1 ⁇ the upper end of the pipe portion 31.
- Head pressure of water surface tension ⁇ (water + fuel) formula (1) Head tension of water> (water + fuel) head pressure ... Formula (2) The head pressure is a pressure expressed in meters of water.
- FIG. 5A is a reference example in which the lower mesh portion 32B through which the auxiliary fuel passes extends from the tank bottom plate 11A of the fuel tank 11 to a height (T1 ⁇ M1) shown by T1 in the drawing.
- T1 ⁇ M1 a height shown by T1 in the drawing.
- the head pressure of (water + fuel) acts only on water, so the water passes through the lower mesh portion 32B.
- the fuel tank 11 starts to be removed. Then, the water is drained to a height TB at which balance can be achieved by the difference in surface tension between the water and the fuel.
- the height TB corresponds to the height (water remaining height) of water remaining in the fuel tank 11, and the height TB is the upper end position T1 of the lower mesh portion 32B (hereinafter, the mesh portion It is a position about 5 mm lower than the upper end position T1).
- the water is discharged when the cock lever 23B of the fuel cock 23 is operated to the RES position.
- the above-described water discharge is performed not only when the motorcycle is in the stopped state but also when the motorcycle is traveling. That is, when the motorcycle is traveling, the height of the liquid surface of the water in the fuel tank 11 fluctuates due to acceleration, deceleration, etc., and the liquid surface of water exceeds the mesh portion upper end position T1 (water + fuel)
- the water can be made to pass through the lower mesh portion 32 B and be extracted from the fuel tank 11 by the head pressure of
- the water is accumulated at a position considerably lower than the mesh portion upper end position T1
- the liquid level of the water does not exceed the mesh portion upper end position T1 even during traveling, so it is difficult to discharge the water. It is.
- the inventors of the present invention provide a closed portion 31 Y in which fuel does not flow in all the way around the tank bottom plate 11 A for the pipe portion 31 of the fuel strainer 24. Below the portion 31Y, a lower mesh portion 32B2 for filtering the fuel to flow into the pipe portion 31 is provided.
- the height of the closed portion 31Y is preferably 5 mm or more.
- the lower mesh portion (second mesh portion) 32B is divided below the blocking portion 31Y by dividing the lower mesh portion 32B into a pair of upper and lower mesh portions 32B1 and 32B2 provided above and below the blocking portion 31Y.
- a mesh portion 32B2 is provided.
- the lower mesh portion 32B2 constitutes the lowermost portion of the second mesh portion 32B.
- FIG. 5 (B) is a figure explaining discharge of the water of this embodiment.
- water is gradually accumulated, and is accumulated to the height TA of the lower end of the closed portion 31Y provided in the vicinity of the tank bottom plate 11A, and the fuel liquid level above the water is mesh portion 32B1.
- head pressure of water and fuel acts as a force which makes water pass lower mesh part 32B2.
- water can pass through the lower mesh portion 32B2 and start to escape from the fuel tank 11, and the water can be drained to a height TB where balance can be achieved due to the difference in surface tension between water and fuel.
- the height TA is located near the tank bottom plate 11A, it is higher than the mesh portion upper end position T1 (the same as the height TA shown in FIG. 5A).
- the height TB is much lower than the height TB shown in FIG. 5B.
- the height of the water in the fuel tank 11 (the remaining water height) can be reduced to the height in the vicinity of the tank bottom plate 11A. Therefore, it is possible to avoid that the amount of fuel that can be stored in the fuel tank 11 is reduced, and it is possible to avoid that the gas runs out immediately after switching to the spare fuel.
- the liquid level of the water in the fuel tank 11 fluctuates, and when the liquid level exceeds the height TA in the vicinity of the tank bottom plate 11A, the head pressure of (water + fuel) You will lose. Therefore, if water is accumulated near the height TA near the tank bottom plate 11A, the water can be drained during traveling.
- the water having passed through the fuel strainer 24 in this manner flows into the carburetor 13 through the fuel reservoir 23C (FIG. 3) in the lower part of the fuel cock unit 21.
- the vaporizer 13 is provided with a drain port (not shown) for draining the water in the vaporizer 13 and a drain hose (not shown) connected to the drain port.
- the water in the vaporizer 13 can be drained through the drain port and the drain hose by operating the drain bolt (not shown). Further, by operating the hexagonal head of the fuel reservoir 23C (FIG. 3) of the fuel strainer 24, it is possible to drain the water in the fuel strainer 24.
- the pipe portion 31 of the fuel strainer 24 has a position corresponding to the vicinity of the tank bottom plate 11A, a closed portion 31Y where fuel does not flow over the entire circumference, and a closed portion Since the lower mesh portion 32B2 functioning as a part of the lower mesh portion 32B is provided below the portion 31Y, water remaining in the fuel tank 11 can be reduced to the vicinity of the tank bottom plate 11A. Thus, the water accumulated in the fuel tank 11 can be reduced, and the reduction of the fuel that can be stored can be suppressed. Further, since it is relatively easy to provide the closed portion 31Y and the lower mesh portion 32B2 in the fuel strainer 24, water remaining in the fuel tank 11 can be reduced without a complicated structure.
- the pipe portion 31 serves as the mesh portion 32.
- lower mesh part 32B is constituted by mesh parts 32B1 and 32B2 provided in the upper and lower sides of closed part 31Y, respectively.
- the closed portion 31Y and the lower mesh portion 32B2 can be provided in the vicinity of the tank bottom plate 11A without changing the upper limit position M1 of the preliminary fuel. In addition, it is possible to obtain an effect that the design change from the conventional fuel strainer is easy.
- the pipe portion 31 is a pipe portion into which the fuel having passed through the upper mesh portion 32A flows and the fuel having passed through the lower mesh portion 32B flows into.
- a gap (second pipe line) 42 between 31 and 41 is provided, and a fuel cock 23 is provided at the lower part of the pipe portion 31 to switch either the small diameter pipe portion 41 or the gap 42 to the engine 12 side.
- this configuration it is possible to switch to the reserve fuel by the fuel cock 23, and prevent dust and the like from flowing into the fuel cock 23. Further, it is possible to obtain an effect that the attachment portion of the fuel tank 11 is only one place. .
- the pipe portion 31 is a closed portion between the upper mesh portion 32A and the lower mesh portion 32B where fuel does not flow over the entire circumference (another closed portion Section 31X, and a seal member 43 is provided between the inner surface of the closed section 31X and the small diameter pipe section 41.
- the upper mesh portion 32A and the lower mesh portion 32B are not used simultaneously, and both are not simultaneously blocked by dust or the like.
- the closed portion 31X is also provided between the upper mesh portion 32A and the lower mesh portion 32B1, when the liquid surface of water rises to the lower end of the closed portion 31X during traveling of the motorcycle, etc. There is no place for the top fuel, and the head pressure of (water + fuel) allows water to pass through the upper mesh portion 32A. This can increase the opportunity for water discharge.
- FIG. 6 is a view showing a fuel cock unit 21 used for a motorcycle according to a second embodiment.
- the fuel in the fuel tank 11 is accumulated between the inner surface of the boss 15 to which the fuel cock unit is attached and which protrudes downward from the tank bottom plate 11A and the pipe 31 passing through the boss 15 A gap 51 which is a reservoir is provided.
- the upper end position 32B2) TA is set lower than in the first embodiment.
- the gap 51 functioning as the fuel reservoir is provided between the boss 15 and the pipe 31 protruding downward from the tank bottom plate 11A.
- the upper end position TA of the lower mesh portion 32B2 it is possible to suppress the remaining water height TB in the fuel tank 11 to the range within the gap 51. Therefore, in addition to various effects similar to those of the first embodiment, it is possible to further reduce the remaining amount of water. As a result, it is possible to further suppress the reduction of the fuel that can be stored.
- the lower mesh portion 32B2 that constitutes the lowermost portion of the mesh portion 32 may be provided below the closed portion 31Y.
- other configurations may be deleted or changed as long as the configurations are included.
- fuel other than gasoline may be sufficient.
- the present invention is applied to the fuel strainer 24 used in a motorcycle.
- the present invention is not limited to this, and a fuel strainer used in a saddle-ride type vehicle other than a motorcycle
- the present invention is widely applicable to P.24.
- the term "saddle-ride type vehicle” includes all vehicles that ride on the vehicle body, and is not limited to motorcycles (including motorbikes), but also three-wheeled vehicles and vehicles classified as ATV (around-ground traveling vehicle) or trike It is a vehicle that includes four-wheeled vehicles.
- the invention is also applicable to a general-purpose engine having a gravity-falling fuel tank and a switchable fuel cock.
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Abstract
Description
この特許文献1には、燃料タンク内に連通する吸入管を備え、この吸入管の上下に渡ってメッシュ状のフィルタ(以下、メッシュ部と言う)を有し、このメッシュ部を通過して吸入管内に入った燃料を燃料噴射ポンプに供給することが記載されている。
この構成によれば、水がタンク底板(11A)近傍の閉塞部(31Y)の下端まで溜まり、水の上の燃料液面が前記閉塞部(31Y)の上方まで下がってくると、下メッシュ部(32B2)を通過することができなくなるので、水と燃料のヘッド圧力が、水を、下メッシュ部(32B2)を通過させる力として作用する。これにより、水を、下メッシュ部を通過させて燃料タンクから排出させることが可能になり、燃料タンク内に残留する水を低減することが可能になる。
また、前記燃料は、水よりも比重が軽く、水よりも前記メッシュ部を通過し易い燃料であれば、燃料より下方に溜まり易くメッシュ部を通過しにくい水を、燃料のヘッド圧力を有効利用してメッシュ部に向けて押し出すことができる。
また、前記パイプ部は、前記メッシュ部として、前記燃料タンク内の予備燃料の上限を規定する上限位置よりも上方の燃料が流入する第1メッシュ部と、前記上限位置よりも下方の燃料が流入する第2メッシュ部とを有し、前記第2メッシュ部は、前記閉塞部の上下にそれぞれ設けられるようにすれば、予備燃料の上限位置を変更することなく、タンク底板の近傍に閉塞部および下メッシュ部を設けることができる。
また、前記パイプ部は、前記第1メッシュ部を通過した燃料が流入する第1管路と、前記第2メッシュ部を通過した燃料が流入する第2管路とを備え、前記パイプ部の下部に、前記第1管路と前記第2管路のいずれかをエンジン側に切り替える燃料コックを備えるようにすれば、燃料コックにより予備燃料への切り替えができるとともに、燃料コックにゴミ等が流れず、また、燃料タンクの取付部が一箇所で済む。
また、前記パイプ部は、前記第1メッシュ部と前記第2メッシュ部との間に、全周に渡って前記燃料が流入しない他の閉塞部を有し、前記他の閉塞部(31X)の内面と前記第1管路との間にシール部材を有するようにすれば、上側メッシュ部と下側メッシュ部の両方が同時にゴミ等で閉塞することがなく、水排出の機会を増やすことができる。
図1は、第1実施形態に係る自動二輪車の燃料タンクを周辺構成と共に示した図である。
この燃料タンク11は、自動二輪車が備える内燃機関であるエンジン12に供給する燃料(本実施形態ではガソリン)を貯留するタンクであり、上下長に比して前後に長いタンク形状に形成され、エンジン12を懸架する車体フレームに支持される。
この燃料タンク11には、燃料コックユニット21が取り付けられ、この燃料コックユニット21が燃料ホース22を介してエンジン12の吸気系の一部を構成する気化器13に接続される。これによって、燃料タンク11内の燃料が、燃料コックユニット21から燃料ホース22を経由して気化器13に供給される。
この燃料タンク11の上面には、燃料を燃料タンク11内に供給する燃料供給口11Cが設けられ、燃料タンク11の下面を構成するタンク底板11Aには、燃料コックユニット21を取り付けるためのボス部15が設けられる。
ボス部15は、タンク底板11Aに溶接等で接合された部品であり、タンク底板11Aから下方に突出するともに外周に雌ねじ(図示されず)を有し、その内側にタンク底板11Aを上下に貫通する貫通孔を有している。このボス部15の貫通孔には、下方から燃料ストレーナ24が挿入され、ボス部15の雌ねじに、燃料コックユニット21に設けられた取り付けナット26が締結されることによって、燃料コックユニット21が燃料タンク11に取り付けられる。
燃料コックユニット21は、燃料の供給経路を開閉可能な燃料コック23と、燃料コック23の入口に設けられて燃料を濾過する燃料ストレーナ24と、燃料コック23の出口を構成する燃料吐出管25とを備えている。
燃料ストレーナ24は、図1に示すように、燃料タンク11内に設けられてタンク底板11Aから上方へ延びる樹脂製のパイプ部31と、パイプ部31の燃料取入口に設けられるメッシュ部32とを有している。
メッシュ部32は、ナイロン製の網状部材で形成され、燃料を濾過するフィルタ部として機能する。パイプ部31を樹脂成形する際にメッシュ部32をインサートしておくことによって、パイプ部31とメッシュ部32とが一体に形成される(インサート成形)。
なお、上側メッシュ部32Aと下側メッシュ部32Bとは上下に間隔を空けて配置され、パイプ部31の上側メッシュ部32Aと下側メッシュ部32Bとの間は、パイプ部31の全周に渡って燃料が流入しない閉塞部31Xに形成されている。
小径パイプ部41は、上端が予備燃料上限位置M1と同じ高さに設けられて開口するとともに、下方に延びて燃料コック23の入口ポート(不図示)につながる。また、この小径パイプ部41は、上端のみが開口し、周壁は開口しない円筒形状で形成される。このため、上端よりも上方に位置するメイン燃料、つまり、上側メッシュ部32Aを通過した燃料が小径パイプ部41に流入し、下側メッシュ部32Bを通過した燃料は小径パイプ部41に流入しない。
より具体的には、この隙間42は、小径パイプ部41とパイプ部31の間に全周に渡って延びる環状であって、下方に延びる隙間に形成される。また、小径パイプ部41の上端部とパイプ部31の内面との間には、環状のシール部材43が介挿され、このシール部材43によって、小径パイプ部41が位置決めされる。これによって、この隙間42には、予備燃料上限位置M1よりも下方の燃料、つまり、下側メッシュ部32Bを通過した燃料が流入する。
すなわち、小径パイプ部41は、上側メッシュ部32Aに流入した燃料が通る第1管路として機能し、小径パイプ部41とパイプ部31との間の隙間42は、下側メッシュ部32Bを通過した予備燃料が流入する第2管路として機能する。
この燃料コック23は、燃料ストレーナ24の下部に連結され、燃料タンク11のタンク底板11Aの下方に露出する。より具体的には、この燃料コック23は、燃料ストレーナ24のパイプ部31および小径パイプ部41の下部に連結される燃料コック本体23Aと、燃料コック本体23Aに回動自在に設けられるコックレバー23Bとを備えている。
また、コックレバー23BがRES位置に操作されると(図2中、23B(RES))、パイプ部31、41間の隙間(第2管路)42が燃料吐出管25に連通する。これにより、予備燃料上限位置M1よりも下方に位置する燃料が下側メッシュ部32Bを通過し、気化器13へ供給される。
また、コックレバー23BがOFF位置に操作されると(図2中、23B(OFF))、燃料ストレーナ24と燃料吐出管25との間の燃料流路が閉じられ、燃料タンク11内の燃料は気化器13へ供給されない。
発明者等が検討したところ、燃料と水が入っている状態では、水がメッシュ部32の上端位置T1まで溜まっていない場合、燃料がメッシュ部32を通過し、水はメッシュ部32を通過しない。つまり、水の液面よりも上にある燃料が優先的にメッシュ部32を通過する。
図4中、高さT1~T2の間は、以下の式(1)が成立する範囲であり、高さT2未満は、以下の式(2)が成立する範囲である。また、高さT2<高さT1<パイプ部31の上端である。
水の表面張力>(水+燃料)のヘッド圧力・・・式(2)
なお、ヘッド圧力は、水柱メートルで表される圧力である。
つまり、高さTBが、燃料タンク11内に残ってしまう水の高さ(水残量高さ)に相当し、この高さTBは、下側メッシュ部32Bの上端位置T1(以下、メッシュ部上端位置T1と言う)から約5mm下がった位置であった。なお、この水の排出は、燃料コック23のコックレバー23BをRES位置に操作しているときに行われる。
なお、水がメッシュ部上端位置T1よりもかなり低い位置に溜まっている場合は、走行中であっても、水の液面がメッシュ部上端位置T1を超えないので、水を排出することは困難である。
そこで、本発明者等は、図3に示すように、燃料ストレーナ24のパイプ部31に対して、タンク底板11Aの近傍に、全周に渡って燃料が流入しない閉塞部31Yを設け、この閉塞部31Yの下方に、燃料を濾過してパイプ部31内に流入させる下メッシュ部32B2を設けるようにしている。なお、発明者等の試験によれば、閉塞部31Yの高さは5mm以上が望ましい。
図5(B)に示すように、水が徐々に溜まり、タンク底板11Aの近傍に設けられた閉塞部31Yの下端の高さTAまで水が溜まり、水の上の燃料液面がメッシュ部32B1を下回ると、水の上の燃料の行き場がなくなる。このため、水と燃料のヘッド圧力が、水を、下メッシュ部32B2を通過させる力として作用する。これにより、水が下メッシュ部32B2を通過して燃料タンク11から抜け始め、水と燃料の表面張力の差によってバランスが取れる高さTBまで水を抜くことができる。
これによって、本実施形態では、水の液面がタンク底板11A近傍の高さTAまで溜まると水が抜け始め、タンク底板11A近傍の高さTBまで抜くことができる。これにより、燃料タンク11内の水の高さ(水残量高さ)を、タンク底板11A近傍の高さに低減することができる。従って、燃料タンク11内に貯留できる燃料が少なくなってしまうことを回避でき、予備燃料に切り替えても直ぐにガス欠になることを回避することができる。
なお、このようにして燃料ストレーナ24を通過した水は、燃料コックユニット21下部の燃料溜まり部23C(図3)を経て気化器13に流入する。一般に、気化器13には、気化器13内の水を排出するドレン口(不図示)およびドレン口につながるドレンホース(不図示)が設けられている。このため、ドレンボルト(不図示)を操作することにより、気化器13内の水をドレン口およびドレンホースを介して排出させることができる。
また、燃料ストレーナ24の燃料溜まり部23C(図3)の六角頭部を操作することによって、燃料ストレーナ24内の水を抜くことが可能である。
また、燃料ストレーナ24に閉塞部31Yと下メッシュ部32B2を設けることは比較的容易であるため、複雑な構造にすることなく、燃料タンク11内に残留する水を低減することができる。
また、本実施形態では、パイプ部31は、メッシュ部32として、燃料タンク11内の予備燃料の上限を規定する予備燃料上限位置M1よりも上方の燃料が流入する上側メッシュ部(第1メッシュ部)32Aと、予備燃料上限位置M1よりも下方の燃料が流入する下側メッシュ部(第2メッシュ部)32Bとを有している。そして、下側メッシュ部32Bを、閉塞部31Yの上下にそれぞれ設けられるメッシュ部32B1、32B2で構成している。
この構成によれば、予備燃料の上限位置M1を変更することなく、タンク底板11Aの近傍に閉塞部31Yおよび下メッシュ部32B2を設けることができる。また、従来の燃料ストレーナからの設計変更がし易い、という効果も得られる。
また、上側メッシュ部32Aと下側メッシュ部32B1との間にも、閉塞部31Xを有するので、自動二輪車の走行時などに、水の液面が上記閉塞部31Xの下端まで上昇すると、水の上の燃料の行き場がなくなり、(水+燃料)のヘッド圧力により、水を、上側メッシュ部32Aを通過させることが可能になる。これにより、水排出の機会を増やすことができる。
図6は、第2実施形態に係る自動二輪車に使用される燃料コックユニット21を示した図である。なお、上記第1実施形態と同様の構成は同一の符号を付して詳細な説明は省略する。
第2実施形態では、タンク底板11Aから下方に突出して燃料コックユニットが取り付けられるボス部15の内面と、ボス部15内を通るパイプ部31との間に、燃料タンク11内の燃料が溜まる燃料溜まり部となる隙間51を設けている。
また、燃料タンク11内に残ってしまう水の高さ(水残量高さ)TBが、燃料溜まり部となる隙間51内の範囲となるように、閉塞部31Xの下端位置(=下メッシュ部32B2の上端位置)TAを、第1実施形態よりも低く設定している。
同図6に示すように、この高さTBは、タンク底板11Aから下方に突出するボス部15内に位置するので、このボス部15内にしか水が残留せず、タンク底板11Aよりも上方まで水が溜まることを回避することが可能になる。従って、第1の実施形態と比べて、水の残量をより減らすことができる。
例えば、上述の実施形態では、燃料コック23と連結された燃料ストレーナ24に本発明を適用する場合について説明したが、燃料コック23と連結されない燃料ストレーナ24に本発明を適用しても良い。
11A タンク底板
12 エンジン
13 気化器
15 ボス部
21 燃料コックユニット
23 燃料コック
24 燃料ストレーナ
25 燃料吐出管
31 パイプ部
31X 閉塞部(他の閉塞部)
31Y 閉塞部
32 メッシュ部
32A 上側メッシュ部(第1メッシュ部)
32B 下側メッシュ部(第2メッシュ部)
32B2 下メッシュ部
41 小径パイプ部(第1管路)
42 隙間(第2管路)
43 シール部材
51 隙間(燃料溜まり部)
Claims (7)
- 燃料を貯留する燃料タンク(11)と、前記燃料タンク(11)内に設けられる燃料ストレーナ(24)とを備え、前記燃料ストレーナ(24)は、タンク底板(11A)から上方へ延びるパイプ部(31)と、前記パイプ部(31)に設けられ、前記燃料を濾過して前記パイプ部(31)内に流入させるメッシュ部(32)とを有する鞍乗り型車両において、
前記燃料ストレーナ(24)のパイプ部(31)は、前記タンク底板(11A)の近傍に、全周に渡って前記燃料が流入しない閉塞部(31Y)を有するとともに、前記閉塞部(31Y)の下方に、前記メッシュ部(32)の一部として機能する下メッシュ部(32B2)を有することを特徴とする鞍乗り型車両。 - 前記燃料は、水よりも比重が軽く、水よりも前記メッシュ部(32)を通過し易い燃料であることを特徴とする請求項1に記載の鞍乗り型車両。
- 前記パイプ部(31)は、前記メッシュ部(32)として、前記燃料タンク(11)内の予備燃料の上限を規定する上限位置よりも上方の燃料が流入する第1メッシュ部(32A)と、前記上限位置よりも下方の燃料が流入する第2メッシュ部(32B)とを有し、
前記第2メッシュ部(32B)は、前記閉塞部(31Y)の上下にそれぞれ設けられることを特徴とする請求項1又は2に記載の鞍乗り型車両。 - 前記パイプ部(31)は、前記第1メッシュ部(32A)を通過した燃料が流入する第1管路(41)と、前記第2メッシュ部(32B)を通過した燃料が流入する第2管路(42)とを備え、
前記パイプ部(31)の下部に、前記第1管路(41)と前記第2管路(42)のいずれかをエンジン(12)側に切り替える燃料コック(23)を備えることを特徴とする請求項3に記載の鞍乗り型車両。 - 前記パイプ部(31)は、前記第1メッシュ部(32A)と前記第2メッシュ部(32B)との間に、全周に渡って前記燃料が流入しない他の閉塞部(31X)を有し、
前記他の閉塞部(31X)の内面と前記第1管路(41)との間にシール部材(43)を有することを特徴とする請求項4に記載の鞍乗り型車両。 - 前記タンク底板(11A)から下方に突出するボス部(15)を有し、このボス部(15)の内側を前記パイプ部(31)が通り、前記ボス部(15)と前記パイプ部(31)との間に、前記燃料タンク(11)内の燃料が溜まる燃料溜まり部(51)を設けたことを特徴とする請求項1乃至5のいずれか1項に記載の鞍乗り型車両。
- 燃料を蓄える燃料タンク(11)内でタンク底板(11A)から上方に延びるパイプ部(31)と、前記パイプ部(31)に設けられ、前記燃料を濾過して前記パイプ部(31)内に流入させるメッシュ部(32)とを有する燃料ストレーナにおいて、
前記パイプ部(31)は、前記タンク底板(11A)の近傍に対応する位置に、全周に渡って前記燃料が流入しない閉塞部(31Y)を有するとともに、前記閉塞部(31Y)の下方に、前記メッシュ部(32)の一部として機能する下メッシュ部(32B2)を有することを特徴とする燃料ストレーナ。
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JPS61244623A (ja) * | 1985-04-22 | 1986-10-30 | Nissan Motor Co Ltd | 燃料タンクの燃料取出し構造 |
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JPS61244623A (ja) * | 1985-04-22 | 1986-10-30 | Nissan Motor Co Ltd | 燃料タンクの燃料取出し構造 |
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JPWO2015040715A1 (ja) | 2017-03-02 |
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JP5937764B2 (ja) | 2016-06-22 |
CN105556107A (zh) | 2016-05-04 |
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