JP4960470B2 - Fuel supply device and fuel supply system - Google Patents

Description

  The present invention relates to a fuel supply device and a fuel supply system in which a pressure adjusting device for adjusting the pressure of fuel supplied to an engine such as a small motorcycle is incorporated.

  Due to environmental problems such as global warming, regulations on fuel consumption and exhaust gas for gasoline engines are becoming stricter. In recent years, regulations on small displacement engines such as small two-wheeled vehicles are also being enforced. Against this background, fuel supply systems for engines of four-wheeled vehicles and two-wheeled vehicles are replaced by conventional mechanical systems using carburetors. In order to reduce the fuel consumption of the engine and clean the exhaust gas, electronic control, that is, FI (Fuel Injection) is required.

  In electronically controlled fuel injection systems for automobiles, medium and large-sized motorcycles, etc., a fuel supply system with an in-tank arrangement in which a fuel pump is installed in the fuel tank is used. This will be deployed in small displacement engines such as small motorcycles. In this case, since the fuel tank capacity is small, it is necessary to review the layout of the fuel tank, so it can be mounted directly on the outer wall of the fuel tank, which is small and lightweight, and can reduce the fuel tank capacity loss as much as possible. A fuel supply system is desired.

  A fuel tank for a small displacement engine has a limited space for mounting a fuel pump for mounting a fuel pump compared to a large displacement engine. On the other hand, a filter for removing foreign matter in fuel is not available. Because it is desirable to increase the filtration area as much as possible from the viewpoint of clogging resistance and the ability to discharge vapor (bubbles) generated under high temperature environments, the maximum filtration area can be achieved within the limited mounting space. In addition, it is necessary to consider the ease of assembly to the fuel tank.

  In addition, if the fuel pump is directly attached to the fuel tank, it is necessary to arrange a discharge passage and a discharge port for discharging the fuel containing vapor discharged from the pressure regulator into the tank. In the pump insertion hole, there is a problem that the space that can be used for the filter is further limited.

Japanese Patent Application No. 2009-170204

  As the above-described conventional fuel supply apparatus described in Patent Document 1, for example, there is a structure shown in FIG. The housing main body 11A is constituted by a body main body 12A, a second body 15 and a third body 21 constituting the first body 12 described below, and the tank insertion part 11B is described below. It is comprised by the fuel delivery part 12B of 1 body part 12, and the adapter 23A.

  The first body portion 12 includes a cylindrical body main body portion 12A and a cylindrical fuel delivery portion 12B protruding from the outer peripheral surface of the body main body portion 12A. The second body portion 15 includes a columnar fitting projection 15A fitted inside the one end side of the body main body portion 12A, and a supply port 15B protruding from one surface of the fitting projection 15A.

  The fitting protrusion 15A is formed with a holding valve arrangement hole 16 that opens to the other surface. Further, the fitting protrusion 15A has a high pressure fuel passage 17 extending from the holding valve arrangement hole 16 to the supply port 15a of the supply port 15B, a branch high pressure fuel passage 18 branched from the high pressure fuel passage 17, and a branch high pressure fuel passage. A drain hole 19 is formed from the branch end side portion of 18 to the other surface of the fitting projection 15A. At this time, the hole directions of the holding valve disposing hole 16 and the drain hole 19 coincide with the axial direction of the fitting protrusion 15A.

The third body portion 21 has a bottomed cylindrical shape, is fitted from the opening side to the other end side of the body main body portion 12A, and a shaft hole (not shown) is provided coaxially at the bottom portion. As described above, the housing main body 11 </ b> A is configured by integrating the body main body 12 </ b> A, the second body 15, and the third body 21.

  Further, the adapter 23A has a disk shape, and is provided on the other surface of the closing portion 24A and the closing portion 24A connected to the fuel passing portion 12B so as to cover the opening of the fuel passing portion 12B on one surface thereof. A suction port 24B is provided. The fuel introduction hole 25 is formed so as to penetrate from the suction port 24a of the suction port 24B through the plug portion 24A to one surface of the plug portion 24A. A circular recess 24b is formed on one surface of the closing portion 24A.

  A return hole 24c is formed so as to penetrate a portion of the closing portion 24A corresponding to the recess 24b in the axial direction of the closing portion 24A. Hereinafter, the opening of the return hole 24c on the other surface side of the closing portion 24A is referred to as a discharge port 24d. The adapter 23A and the fuel delivery part 12B are connected so that the peripheral edge on the one surface side of the adapter 23A and the end face on the protruding side of the fuel delivery part 12B are opposed to each other via the seal member 27. As described above, the tank insertion portion 11B is configured by integrating the adapter 23A and the fuel delivery portion 12B.

  A mounting hole 2 a is formed in the lower portion of the fuel tank 2. The fuel supply device 10A is attached to the fuel tank 2 via a mounted body 90 described below. The mounted body 90 is formed in a cylindrical shape and has a flange portion 90a that extends radially outward from one end in the axial direction.

  The mounted body 90 is inserted into the fuel tank 2 from the other end side, and is mounted on the fuel tank 2 so that the flange portion 90a is in close contact with the outer surface of the fuel tank 2. Note that the mounted body 90 is mounted on the fuel tank 2 so that the liquid-tightness and air-tightness inside and outside the fuel tank 2 are maintained.

  The fuel supply device 10A then attaches the adapter 23A to the fuel delivery part 12B, and further attaches the filter 68a to the suction port 24B, and then inserts the tank insertion part 11B into the fuel tank 2 and attaches the fuel delivery part 12B. By fitting in the body 90, it is directly attached to the fuel tank 2 via the mounted body 90.

  At this time, the axial direction of the body body portion 12A of the first body portion 12 coincides with the substantially horizontal direction, and the filter 68a is disposed so as to cover the discharge port 24d when viewed from above in the vertical direction. Further, the seal member 27 between the one end surface of the fuel delivery portion 12B and the outer peripheral edge portion of the adapter 23A is in close contact with the inner peripheral surface of the mounted body 90, and the fuel in the fuel tank 2 is transferred to the mounted body. There is no leakage outside the fuel tank 2 between 90 and the fuel delivery part 12B.

  The motor 33 is integrally attached to the housing 11 in advance. And although not shown in figure, the above-mentioned high-pressure pipe 4 which connects the edge part of the supply port 15B and the fuel injection valve 6 is piped, and the fuel supply system 1 is comprised.

  The fuel supply device 10A can directly attach the housing 11 to the fuel tank 2 by opening the suction port 24a and the discharge port 24d of the suction port 24B in the fuel tank 2.

The fuel sent out from the pressure adjusting device 70 flows through the return path 60A and is discharged into the fuel tank 2 from the discharge port 24d. That is, the pressure adjusting device 7 from the high pressure fuel passage 17.
The fuel discharged by being led to 0 is returned to the fuel tank 2 without being returned to the fuel pump 30.

  In such a conventional fuel supply system, the fuel pump 30 including the pressure regulator 70 is directly fixed to the outer wall of the fuel tank 2, so that surplus fuel from the suction pipe and the pressure regulator 70 is removed from the fuel tank 2. Since the exhaust pipe for returning to the factory can be abolished, the number of parts can be reduced and it can be easily installed even in a limited space such as a small two-wheeled vehicle.

  However, it is necessary to provide an independent discharge passage in order to discharge the surplus fuel from the pressure adjusting device 70 in the space where the mounting hole of the fuel pump 30 of the fuel tank 2 is limited, and when the fuel pump 30 is stopped. In order to prevent foreign matter in the fuel tank 2 from entering the fuel pump 30 from the fuel discharge port 24d, it is necessary to take measures to prevent foreign matter from entering, such as the installation of a backflow prevention valve and the installation of a discharge filter as in the conventional example. there were.

  In addition, by providing an independent discharge passage and installing a backflow prevention valve and a discharge side filter, it is difficult to secure a sufficient filter area and suction passage area. It was unavoidable that the inhalability was difficult to secure.

  Further, since the filter 68a is formed in a rectangular flat plate shape, there is a problem that it cannot be said that the filter filtration area can be sufficiently secured.

  The present invention has been made in order to solve the above-described problems, and is capable of preventing the entry of foreign matter in the fuel in the fuel tank into the fuel pump and providing a fuel supply capable of sufficiently securing the filter filtration area. A device is provided.

  A fuel supply apparatus according to the present invention includes a casing that is inserted into a fuel tank insertion hole of a fuel tank, has a fuel discharge passage that sucks the fuel in the fuel tank and discharges the sucked fuel, and the inside of the casing. A fuel pump housed in the casing, a pressure adjusting device housed in the casing, and a fuel suction port attached to an upper side of the casing and configured to suck the fuel in the fuel tank into the fuel pump. A lid member adapter having a passage and a fuel discharge passage for returning the fuel from the pressure adjusting device into the fuel tank; and an upper side of the lid member adapter, and filtering the fuel in the fuel tank to suck the fuel A filter to be sucked into the passage, and a fuel from the pressure regulator provided in communication with the fuel discharge passage of the lid member adapter Those having a fuel outlet for discharging into the filter.

  According to the fuel supply system of the present invention, it is possible to obtain a fuel supply device that can prevent foreign matters in the fuel tank from entering the fuel pump and can sufficiently secure a filter filtration area.

It is a block diagram of a fuel supply system provided with the fuel supply apparatus concerning Embodiment 1 of this invention. It is sectional drawing which shows the fuel supply apparatus concerning Embodiment 1 of this invention by a partial fracture. It is a front view which shows the filter part (however, a filter is not shown) in the fuel supply apparatus concerning Embodiment 1 of this invention. FIG. 3 is a cross-sectional view showing a filter portion (however, a filter is not shown) in the fuel supply device according to Embodiment 1 of the present invention.

It is sectional drawing which shows the fuel supply apparatus which concerns on Embodiment 2 of this invention partially fractured | ruptured. It is a front view which shows the filter part (however, a filter is not shown) in the fuel supply apparatus which concerns on Embodiment 2 of this invention. It is sectional drawing which shows the filter part (however, a filter is not shown) in the fuel supply apparatus which concerns on Embodiment 2 of this invention. It is sectional drawing which shows the conventional fuel supply apparatus by a partial fracture.

Embodiment 1 FIG.
Embodiment 1 of the present invention will be described below with reference to FIGS. 1 is a block diagram of a fuel supply system including a fuel supply apparatus according to Embodiment 1 of the present invention. FIG. 2 is a sectional view showing the fuel supply apparatus according to Embodiment 1 of the present invention in a partially broken view. FIG. 3 is a front view showing a filter portion (however, the filter is not shown) in the fuel supply apparatus according to Embodiment 1 of the present invention. FIG. 4 is a cross-sectional view showing a filter portion (however, the filter is not shown) in the fuel supply apparatus according to Embodiment 1 of the present invention.

  A main configuration of the fuel supply system 100 including the fuel supply apparatus 102 will be described. In FIG. 1, a fuel supply system 100 is connected to a fuel supply apparatus 102 via a fuel tank 101, a fuel supply apparatus 102 directly attached to the outer surface of the fuel tank 101, and a fuel supply pipe 103. Fuel injection valve 104 for injecting fuel supplied from a fuel chamber of an engine (not shown), fuel supply from the fuel supply device 102 to the fuel injection valve 104, and drive for controlling the fuel injection timing from the fuel injection valve 104 And a control unit 105. In addition, 125 is a fuel pressure holding valve.

  The fuel supply device 102 is configured as follows. A casing 108 having a fuel discharge passage 106 connected to the fuel supply pipe 103 and a conductive portion 107 with the fuel tank 101 is directly attached to the outer wall of the fuel tank insertion hole 101 a of the fuel tank 101.

  The casing 108 houses a fuel pump 110 that pressurizes the fuel taken from the fuel suction passage 109 to a high pressure and discharges the fuel from the fuel discharge passage 106. In the casing 108, a pressure adjusting device 111 for adjusting the fuel pressure in the fuel supply pipe 103 to a predetermined value and returning excess fuel to the fuel tank 101 is housed.

  A cylinder 113 that holds the pressure adjusting device 111 and has a fuel discharge hole 112 on the side surface is provided. A motor 114 for driving the fuel pump 110 is provided, and the fuel pump 110 and the motor 114 are connected by a bush 115.

  Excess fuel from the fuel intake passage 109 having a fuel intake port 109a through which the fuel in the fuel tank 101 is sucked into the fuel pump 110 and the pressure adjusting device 111 are disposed on the fuel tank 101 side above the conducting portion 107 of the casing 108. A lid member adapter 117 having a fuel discharge passage 116 for returning to is fitted and attached.

  The fuel discharge hole 112 of the cylinder 113, the fuel discharge passage 116 of the lid member adapter 117, and the fuel suction passage 109 are structured to have a sealing property by a rubber ring 118.

  On the upper side of the lid member adapter 117, a skeleton member 119 that supports the shape of the filter 120 is integrally formed in a cylindrical shape, and the filter 120 is a vertical cylinder stretched around the skeleton member 119. The lower end portion 120a is fixed by being sandwiched between the flange portion 117a of the lid member adapter 117 and the ring-shaped stopper 121. The filter 120 filters the fuel in the fuel tank 101 and sucks it into the fuel suction passage 109 from the fuel suction port 109a.

  In the above-described conventional filter 68a, since the fuel discharge port 24d is arranged obliquely and horizontally so as not to be shielded in the form of a rectangular flat plate, the ease of assembly into the fuel tank insertion hole 2a is considered. Although the overall length is restricted, as in the first embodiment, by making the filter 120 into a vertical cylindrical shape, a sufficient filter filtration area that makes the most effective use of the fuel tank insertion hole 101a is secured. In addition, even when the fuel supply device 102 is attached / detached, it is extremely unlikely that the filter 120 will be hooked on the flange of the fuel tank insertion hole 101a, and the assembling workability can be remarkably improved compared to the conventional one described above. It becomes.

  The lid member adapter 117 and the stopper 121 are fixed by fixing means such as press-fitting, welding, and adhesion, and the fixing means is not limited.

  Further, the distal end portion of the skeleton member 119 has a ring-shaped portion 119a, and the filter 120 stretched on the outer periphery of the skeleton member 119 has a partially planar shape portion 120b at the distal end portion along the ring-shaped portion 119a. Have.

  Accordingly, when vapor generated from fuel in the fuel pump 110 enters the filter 120 in a high temperature environment, the filter flat portion 120b perpendicular to the vapor traveling direction is provided, so that It becomes possible to improve the vapor discharge property to the outside of the filter 120.

  That is, since the filter 120 has a vertically long cylindrical shape whose overall height is longer than the diameter, the filter filtration area can be sufficiently secured, so that the temperature of the fuel in the fuel tank 101 rises, and the raised fuel Even if vapor is generated by sucking the gas into the filter 120, the vapor quickly moves to the planar shape portion 120b side of the filter 120 and is discharged out of the filter 120. Therefore, the vapor generated in the filter 120 is not sucked into the fuel pump 110 side.

  Further, a fuel discharge port 122 that communicates with the fuel discharge passage 116 of the lid member adapter 117 and discharges excess fuel from the pressure adjusting device 111 into the filter 120 is provided. The fuel discharge port 122 is in contact with a filter inner surface 120c located on the lower side of the filter 120 and is opened inside the filter 120. The fuel discharge port 122 is in close contact with the periphery of the fuel discharge port 122 along the filter inner surface 120c. A wall surface portion 119b is provided.

  By providing the fuel discharge port 122 inside the filter 120, foreign matter intrusion from the fuel discharge port 122 can be surely prevented without adding new parts such as a backflow prevention valve or a discharge side filter, By causing the wall surface portion 119b of the skeleton member 119 provided around the fuel discharge port 122 to be in close contact with the filter inner surface 120c, the vapor generated in the pressure adjusting device 111 does not accumulate in the filter 120, but passes through the filter 120 and passes through the fuel. It becomes possible to discharge into the tank 101.

Embodiment 2. FIG.
A second embodiment of the present invention will be described with reference to FIGS. FIG. 5 is a cross-sectional view showing a fuel supply device according to Embodiment 2 of the present invention in a partially broken view. FIG. 6 is a front view showing a filter portion (however, the filter is not shown) in the fuel supply apparatus according to Embodiment 2 of the present invention. FIG. 7 is a cross-sectional view showing a filter portion (however, the filter is not shown) in the fuel supply apparatus according to Embodiment 2 of the present invention.

  In the fuel supply device according to Embodiment 1 described above, the lid member adapter 117 and the skeleton member 119 that supports the shape of the filter 120 are integrally configured, and the filter 120 is formed by the lid member adapter 117 and the ring-shaped stopper 121. The fuel supply device according to the second embodiment is a separate component from the lid member adapter 117 and the skeleton member 119 that supports the shape of the filter 120, and the skeleton member 123 is described. And the lid member adapter 117, the filter 120 is sandwiched and fixed. The lid member adapter 117 and the skeleton member 123 are fixed by means such as press-fitting, welding, and adhesion, and the fixing means is not limited.

  Further, a fuel discharge port 124 that communicates with the fuel discharge passage 116 of the lid member adapter 117 and discharges surplus fuel from the pressure adjusting device 111 into the filter 120 is provided. The fuel discharge port 124 is open to the inside of the filter 120 in contact with the filter inner surface 120c located on the lower side of the filter 120, and is closely attached to the periphery of the fuel discharge port 124 along the filter inner surface 120c. The wall surface portion 123b is provided.

  By providing the fuel discharge port 124 inside the filter 120, foreign matter intrusion from the fuel discharge port 124 can be surely prevented without adding new parts such as a backflow prevention valve or a discharge side filter, By causing the wall surface portion 123b of the skeleton member 123 provided around the fuel discharge port 124 to be in close contact with the filter inner surface 120c, the vapor generated in the pressure adjusting device 111 does not accumulate in the filter 120, but passes through the filter 120 and passes through the fuel. It becomes possible to discharge into the tank 101.

  In addition, when vapor generated from fuel in the fuel pump 110 enters the filter 120 in a high temperature environment, the filter inner surface 120c perpendicular to the vapor traveling direction is provided, so that the filter from the inside of the filter 120 is provided. 120 It becomes possible to improve the vapor discharge property to the outside.

  That is, since the filter 120 has a vertically long cylindrical shape whose overall height is longer than the diameter, the filter filtration area can be sufficiently secured, so that the temperature of the fuel in the fuel tank 101 rises, and the raised fuel Even if vapor is generated by sucking the gas into the filter 120, the vapor quickly moves to the planar shape portion 120b side of the filter 120 and is discharged out of the filter 120. Therefore, the vapor generated in the filter 120 is not sucked into the fuel pump 110 side.

  Furthermore, according to the second embodiment, when it is necessary to change the overall length and shape of the filter 120 depending on the installed model, the complicatedly shaped lid member adapter 117 is used as a common part, and only the skeleton member 123 is used for each model. It only has to be set, and parts management becomes easy.

The present invention is suitable for realizing a fuel supply apparatus that can prevent foreign matter in a fuel tank from entering a fuel pump and can sufficiently secure a filter filtration area.

DESCRIPTION OF SYMBOLS 100 Fuel supply system 101 Fuel tank 102 Fuel supply apparatus 106 Fuel discharge passage 108 Casing 109 Fuel inlet passage 109a Fuel inlet 110 Fuel pump 111 Pressure regulator 116 Fuel discharge passage 117 Lid member adapter 119 Frame member 119a Ring shape part 119b Wall part DESCRIPTION OF SYMBOLS 120 Filter 120b Plane part 120c Filter inner surface 121 Stopper 122 Fuel outlet 123 Frame member 123a Ring-shaped part 123b Wall part 124 Fuel outlet

Claims (6)

A casing having a fuel discharge passage which is inserted into a fuel tank insertion hole of a fuel tank and discharges the sucked fuel while the fuel in the fuel tank is sucked; a fuel pump housed in the casing; A pressure adjusting device housed in the casing; a fuel intake passage which is attached to the upper side of the casing and has a fuel inlet for sucking the fuel in the fuel tank into the fuel pump; and the fuel from the pressure adjusting device A lid member adapter having a fuel discharge passage for returning the fuel into the fuel tank; a filter attached to the upper side of the lid member adapter for filtering the fuel in the fuel tank and sucking it into the fuel suction passage; and the lid A fuel discharge passage provided in communication with the fuel discharge passage of the member adapter and discharging the fuel from the pressure adjusting device into the filter. The fuel supply apparatus characterized by comprising a mouth. 2. The fuel supply device according to claim 1, wherein a wall surface having a shape along an inner surface of the filter is provided around the fuel discharge port, and the wall surface is in close contact with the inner surface of the filter. The filter has a vertically long cylindrical shape whose overall height is longer than the diameter, and the lid member adapter is provided with a skeleton member that supports the filter in a cylindrical shape, and the tip thereof has a ring-shaped portion. 3. The fuel supply device according to claim 1, wherein a tip portion of the filter stretched on the outer periphery of the skeleton has a part of a flat portion along the ring-shaped portion. The fuel supply device according to claim 3, wherein the filter is sandwiched and fixed by the lid member adapter and a stopper, and the lid member adapter and the stopper are fixed by a fixing means. The filter is sandwiched and fixed by a skeleton member having a cylindrical shape with the lid member adapter, and the lid member adapter and the skeleton member are fixed by fixing means. The fuel supply device described in 1.   A fuel supply system comprising the fuel supply device according to any one of claims 1 to 5.

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