JP4888419B2 - Vehicle fuel supply system - Google Patents

Description

  The present invention relates to a fuel supply device for a vehicle that pumps fuel in a fuel tank to an injector of an internal combustion engine for the vehicle, and more specifically, even if there is a change in the oil level due to sudden braking or the like, the fuel is stably pumped. It relates to a possible structure.

  In order to capture foreign matters such as dust contained in the fuel and to stably supply this fuel to an injector of a fuel injection device attached to the engine, for example, nylon such as nylon provided in the suction port of the fuel pump. First, remove impurities in the fuel tank with a relatively coarse mesh strainer. For impurities including wear powder such as brushes and commutators that pass through this strainer or that are generated in the motor section that constitutes the fuel pump, the It is widely known to capture with a high-pressure filter, for example a paper filter element, arranged in the next stage of the pump).

  By the way, since the strainer described above is positioned at the so-called uppermost stream in the fuel supply, it is generally positioned at the bottom of the fuel tank so that the fuel can be supplied even when the fuel in the fuel tank decreases. . On the other hand, even when the amount of fuel is small, even if the oil level changes due to acceleration / deceleration or a change in posture, it is particularly required for motorcycles that the fuel pump can reliably suck the fuel without being affected by the change. Needless to say, when the vehicle is decelerating or traveling downhill, the remaining fuel moves to the front of the fuel tank, causing the strainer to be exposed from the oil level of the fuel. This is nothing other than preventing the so-called breathing phenomenon of the engine, which does not increase in number and accelerate. Therefore, a pressure regulator that keeps the pressure of the fuel supplied to the injector constant is incorporated in the fuel supply device, and the surplus fuel from the discharge port is directed by directing the opening of the hose connected to the discharge port of this pressure regulator to the strainer. It has been disclosed to reach the strainer directly and efficiently (see, for example, Patent Document 1).

JP 2003-148267 A (right column, page 3, lines 45-49, FIG. 2)

  In this way, by incorporating the pressure regulator into the fuel supply device, the piping around the fuel tank is made compact, and surplus fuel is not heated by the engine heat. And the effect of suppressing the generation of bubbles can be expected. However, when viewed from the fuel flow path in the fuel supply device, it goes without saying that the pressure regulator is disposed at the next stage of the fuel pump and the high-pressure filter, and thus is somewhat separated from the strainer. Therefore, since both of them must be connected by a hose or the like, the number of parts and the number of assembling steps are increased, which has been a drag on cost reduction. By reviewing the layout of the fuel supply device, it is physically possible to place the strainer in the vicinity, but in this case as well, the cost increases between the fuel pump and the high-pressure filter or between the high-pressure filter and the pressure regulator. It is easily expected that some connecting means to be connected must be interposed.

  The present invention has been made to solve the above-described problems, and has devised the shape of the existing parts constituting the fuel supply device to secure a flow path for surplus fuel from the pressure regulator. An object of the present invention is to obtain a vehicle fuel supply device.

A vehicle fuel supply device according to the present invention includes a flange portion that is fitted in an opening of a fuel tank and to which a discharge pipe and a stay are fixed, and a strainer that is attached to the stay and sucks the fuel in the fuel tank. A bottomed pump case having an opening for housing a fuel pump for discharging the fuel, a high-pressure filter for covering the opening of the pump case and filtering the fuel that has passed through the fuel pump, and the discharge A filter unit provided with a pressure regulator for setting the fuel discharged from the pipe to a predetermined pressure; and a bottomed vessel that is attached to the pump case and covers the strainer. to allowed to reach the strainer, with cut out portions of the bottom shape of the Bethel, the above pump case, the Adjacent to the pump housing chamber for housing a charge pump, the excess fuel from the pressure regulator is provided a flow path for allowing reaching the strainer, the outlet of the channel is in the strainer housing chamber for housing the strainer, Further, the axis of the fuel pump and the axis of the pressure regulator are parallel, and the outer periphery of the fuel pump and the outer periphery of the pressure regulator intersect each other when viewed from the axial direction .

  As described above, the present invention can provide a vehicle fuel supply device that is compact and inexpensive.

Embodiment 1 FIG.
1 is a cross-sectional view showing a state in which a vehicle fuel supply device (hereinafter referred to as a fuel supply device) according to Embodiment 1 of the present invention is installed inside a fuel tank of a motorcycle, for example, a motorcycle. FIG. 2 is a front view and a top view of the fuel supply device in FIG. FIG. 3 is an exploded perspective view of the fuel supply apparatus in FIG.

  As shown in FIG. 1, in the installed state, the fuel supply device 1 has a configuration that is substantially parallel to the bottom left bottom portion 11a on the paper surface of the fuel tank 11 of the motorcycle. The flange portion 13 remaining outside the bottom portion 11a is inserted by the bolt 15 through the packing 14 after being inserted from the side of the vessel 12 described later through the opening portion 11b provided in the portion 11a and rotated 90 degrees counterclockwise. By fixing to the bottom part 11a, the opening part 11b is closed and the fuel supply device 1 is installed in the fuel tank 11. A stay 16 and a discharge pipe 17 are welded to the flange portion 13, and the stay 16 is formed in a substantially U shape having a pair of substantially L-shaped side plates, and the substantially L-shaped bending point. The filter part 18 and the pump case 19 which will be described later are fitted toward the head. On the other hand, the discharge pipe 17 is press-fitted into the filter portion 18, and a fuel hose (not shown) is connected to the discharge port 17a. This fuel hose is also connected to an injector (not shown).

  In FIG. 2, a high-pressure filter 22 is provided in the filter unit 18 for capturing abrasion powder such as brushes and commutators generated by a fuel pump 20 described later, and impurities that could not be removed by a strainer 21 described later. . The fuel that has passed through the high-pressure filter 22 is discharged from the discharge pipe 17, and a known pressure regulator 23 that maintains the fuel pressure at this time at a predetermined value is fixed in a liquid-tight manner to the filter portion 18 via an O-ring 24. ing. The filter portion 18 is also provided with a fuel suction port 18a. A connection pipe 26 is connected via an O-ring 25, and a discharge port 20a of the fuel pump 20 is connected to the connection pipe 26 via an O-ring 27. The fuel pressurized by the fuel pump 20 is sent to the high pressure filter 22. As is well known, the pressurized fuel is sucked up through a strainer 21 attached to the fuel inlet 20b of the fuel pump 20. Further, a well-known check valve 28 is provided in the discharge port 20a so that the fuel remaining in the fuel hose does not flow back to the fuel tank 11 when the engine is stopped.

  Since the pump case 19 has a bottomed shape that opens on the right side as an opening 19a on the paper surface, the fuel pump 20 is covered, and a through hole 19b is provided at the bottom of the pump case 19. A connecting pipe 21a (see FIG. 3) of the strainer 21 can be connected to the fuel inlet 20b inserted through the hole 19b. For the sake of convenience, the bottom and right sides of the paper are referred to as the pump storage chamber 19c and the left side as the strainer storage chamber 19d. On the other hand, the left side also has a bottomed shape, and a part thereof, more specifically, a bezel 12 with a cutout on the top of the paper is mounted, and the cutout is a cutout portion. The strainer 21 is exposed from the portion 12a. As is apparent from FIG. 1, as long as the fuel supply device 1 is immersed in the fuel 29, the fuel is sucked from the notch 12 a. Further, as a result of maintaining the fuel pressure at a predetermined value, surplus fuel is discharged from the pressure regulator 23 and guided to the vessel 12. This is the main part of the present invention, and will be described in detail later. Note that 19e (see FIG. 3) is a bubble discharge hole for discharging bubbles generated by the suction and pressurization of fuel, and 30 is an oil surface 29a (see FIG. 1) attached to the stay 16 via a support plate 31. It is a known thermistor for detecting

  Next, the assembly procedure of the fuel supply device 1 will be described with reference to FIG. After the fuel pump 20 and the pressure regulator 23 are fitted to the filter portion 18, the guide 18 b of the filter portion 18 is inserted into the pair of tips 16 a of the stay 16 and is slid to the bending point of the stay 16. By press-fitting into the filter portion 18 and connecting the lead wire from the fuel pump 20 to the connector 32 provided on the flange portion 13, first, a semi-finished product centering on the flange portion 13 in the drawing is assembled. Subsequently, while attaching the cup 33 for guiding the surplus fuel from the pressure regulator 23 to a flow path 19f described later provided in the pump case 19 to the housing 23a (see FIG. 2) of the pressure regulator 23, The guide 19g is also inserted through the tip 16a, and the pump case 19 is slid until the upper surface of the pump case 19 abuts the lower surface of the filter portion 18.

  A portion corresponding to the tip 16a of the guide 19g is wide, and a screw 35 is fastened to a screwed portion of the tip 16a via a stop plate 34 (on the paper surface, the support plate 31 described above on the front side) on the wide portion. As a result, the pump case 19 and the filter unit 18 are attached to the stay 16. With this attachment, the fuel suction port 20b is inserted through the through hole 19b and protrudes toward the strainer storage chamber 19d, so that the connection pipe 21a is connected, whereby a so-called fuel path from the strainer 21 to the discharge pipe 17 is formed. Will be formed. Finally, the vessel 12 is mounted. This mounting is performed by one touch, that is, the engaging convex portion 19h provided on the outer peripheral portion forming the strainer storage chamber 19d, the engaging concave portion 12b and the notch portion 12a provided on the vessel 12. It is performed by the engagement. Through the above assembly work, the fuel supply device 1 can be installed in the fuel tank 11 described above.

  The operation relating to the fuel supply of the fuel supply device 1 is well known. That is, when the fuel pump 20 is driven through the connector 32, the fuel 29 in the fuel tank 11 is sucked and pressurized to the fuel suction port 20b via the strainer 21 by the rotation of the impeller (not shown) of the fuel pump 20. It is discharged from the discharge port 20a. The discharged fuel is supplied to an injector of an internal combustion engine through a high pressure filter 22 in the filter unit 18, a discharge pipe 17, and a fuel hose (not shown). On the other hand, when the pressure of the fuel in the filter unit 18 is higher than a predetermined value, the fuel is discharged as surplus fuel from the pressure regulator 23 to keep the pressure at a predetermined value.

  When the fuel 29 is sucked by the strainer 21, the strainer 21 is covered with the vessel 12 as described above. However, since the upper surface is open on the paper surface of FIG. 2, the fuel 29 is filled (see FIG. 1), the fuel 29 can be taken around the strainer 21 quickly and efficiently. Further, even when the oil level 29a is lowered (29b in the figure) and the strainer 21 is exposed due to the inclination of the vehicle body due to curve driving, for example, the strainer storage chamber 19d functions as a so-called fuel storage chamber by the vessel 12. By utilizing the fuel stored in the tank, there is no problem in pressurization and suction of the fuel pump 20.

  However, the fuel stored in the fuel storage chamber is naturally limited, and if the strainer 21 continues to be exposed, an engine breathing phenomenon may occur. Therefore, in the present invention, attention is paid to the surplus fuel from the pressure regulator 23, and this surplus fuel is efficiently guided to the fuel storage chamber. More specifically, a hollow flow path 19f is provided in the outer peripheral portion of the pump case 19 whose cross section in the direction orthogonal to the axial direction of the fuel pump 20 is hollow, for example, by integral molding. The outlet 19i of the flow path 19f is provided in the strainer storage chamber 19d as shown in FIG. 3, and the nozzle 33a of the cup 33 is connected to the flow path 19f by attaching the cup 33 described in the assembly procedure. The pump storage chamber 19c and the flow path 19f are not communicated with each other in the cross section described above. This is because when the surplus fuel at the corner flows into the pump storage chamber 19c, the surplus fuel also jumps out of the opening 19a with the exposure of the strainer 21 due to the inclination of the vehicle body or acceleration / deceleration, that is, the large movement of the oil level 29b. It is intended to prevent it.

  Therefore, after the surplus fuel from the pressure regulator 23 flows into the flow path 19f via the nozzle portion 33a, it reaches the strainer 21 from the outlet 19i, that is, the fuel storage chamber without leaking. Even if the state of exposure continues, the possibility of causing a breathing phenomenon of the engine becomes extremely low. In addition, the above-mentioned effect can be obtained without adding a special member simply by reviewing the shape of a member that is indispensable for mounting and supporting the fuel pump 20 called a pump case. An inexpensive fuel supply device can be provided.

  In view of the addition of members, the present invention requires the cup 33, but as is apparent from FIG. 2 (b), this is the fuel pump 20 with respect to the axial direction of the fuel pump 20. Since both members are arranged so that a part of the outer periphery of the pressure regulator 23 wraps around a part of the outer periphery of the pressure regulator 23, the pump case 19 does not interfere with the fuel pump 20 during the assembly. This is intended to ensure that surplus fuel from the pressure regulator 23 flows into the flow path 19f while sliding 16. As a result, the radial direction of the fuel supply device 1 excluding the flange portion 13 can be reduced, and the diameter of the opening 11b can be reduced. Therefore, the airtightness of the fuel tank 11 is improved and the strength is increased. A great effect can be expected.

  In the present embodiment, the high-pressure filter 22 is provided. However, for example, the high-pressure filter 22 is not necessarily required by reducing the mesh of the strainer 21. However, the high-pressure filter 22 is not necessarily provided. Even a fuel supply device does not depart from the scope of the present invention.

It is sectional drawing which shows the state which installed the fuel supply apparatus in Embodiment 1 of this invention in the inside of a fuel tank. It is the (a) front view and (b) top view of the fuel supply apparatus in FIG. It is a disassembled perspective view of the fuel supply apparatus in FIG.

Explanation of symbols

1 fuel supply device, 11 fuel tank, 11b opening, 12 vessel,
12a Notch, 13 flange, 16 stay, 17 discharge pipe,
18 Filter part, 19 Pump case, 19a Opening part, 19c Pump storage chamber,
19d strainer storage chamber, 19f flow path, 19i outlet, 20 fuel pump,
21 strainer, 22 high pressure filter, 23 pressure regulator,
33 cups.

Claims (1)

To house a flange portion that is fitted in the opening of the fuel tank and to which the discharge pipe and the stay are fixed, and a fuel pump that is attached to the stay and discharges the fuel sucked through the strainer that sucks in the fuel in the fuel tank. A bottomed pump case having an opening, a high-pressure filter that covers the opening of the pump case and filters the fuel that has passed through the fuel pump, and a fuel discharged from the discharge pipe at a predetermined pressure A filter portion provided with a pressure regulator to be set; and a bottomed vessel that is attached to the pump case and covers the strainer, and the bottom of the vessel is made to reach the strainer. In the vehicle fuel supply device in which a part of the shape is cut out,
The pump case is provided with a flow path for allowing surplus fuel from the pressure regulator to reach the strainer, adjacent to a pump storage chamber for storing the fuel pump, and an outlet of the flow path is connected to the strainer. The fuel pump axis and the pressure regulator axis are parallel to each other, and the outer periphery of the fuel pump and the outer periphery of the pressure regulator intersect each other when viewed from the axial direction. fuel supply device for a vehicle, characterized in that there.

Images