JP2006144552A - In-line type fuel supply device for two wheeler - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To improve loading property onto a two wheeler and improve mounting workability by arranging a fuel pump, a strainer, and a pressure regulator in a single case integrally in advance. <P>SOLUTION: A pump storage chamber 10 is formed by a bottomed cup-like pump body 1 and a pump cover 4, and the fuel pump P provided with the strainer S connected with a pump suction passage Pa is arranged in the pump storage chamber 10. The fuel pump P is supported by a locking step part 1c of the pump cover 4 and the pump cover 4, a fuel suction hole 2 communicated with a fuel tank T is opened into a fuel flowing-in chamber 19 in which the strainer S is arranged, and a pump discharge passage Pb is communicated with a fuel discharge hole 7 provided in the pump cover 4. The pressure regulator R is stored and arranged in a regulator storage chamber 6 of the pump cover 4, and a regulator fuel flowing-in hole 12 is communicated with the fuel discharge hole 7 through a regulator fuel flowing-in passage 8. A regulator fuel discharge hole 16 is communicated with an annular fuel chamber 23 through the regulator storage chamber 6, and the annular fuel chamber 23 is communicated with the fuel tank T through a fuel discharge hole 3. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

The present invention boosts the fuel in a fuel tank with a fuel pump, controls the boosted fuel to a predetermined fuel pressure by a pressure regulator, and supplies the regulated fuel toward the fuel injection valve About.
Such fuel supply devices include an in-tank type in which the fuel pump is disposed in the fuel tank and an in-line type in which the fuel pump is disposed outside the fuel tank. An in-line type fuel supply apparatus that does not require major changes is used.

FIG. 3 shows a conventional in-line fuel supply apparatus used for a motorcycle.
K is a throttle body having an intake passage 50 formed therethrough, and the intake passage 50 is opened and closed by a throttle valve 52 attached to a throttle valve shaft 51 rotatably supported by the throttle body K. The
J is a fuel injection valve attached to the throttle body K, and fuel pressurized by a fistula (not shown) opened at the tip of the fuel injection valve is injected into the intake passage 50a downstream of the throttle valve 52. Supplied.
The throttle body K is connected to the engine E via the intake pipe 53, and the intake passage 50 a downstream from the throttle valve 52 is connected to the intake pipe 53.
On the other hand, the intake passage 50 b on the upstream side of the throttle valve 52 is connected to the air cleaner A.
Accordingly, clean air from which foreign matter has been removed by the air cleaner A is supplied from the air cleaner A to the engine E through the intake passage 50 and the intake pipe 53 of the throttle body K. The amount of air supplied by the throttle valve 52 It is controlled by opening and closing the intake passage 50.
T is a fuel tank in which fuel is stored, and in an inline type, a fuel pump P is disposed outside the fuel tank T.
The fuel tank T and the pump suction path Pa of the fuel pump P are connected by a fuel inflow pipe 54, and a strainer S is disposed in the fuel inflow pipe 54.
The pump discharge path Pb of the fuel pump P and the fuel injection valve J are connected to each other by a fuel discharge pipe 55.
Further, the regulator fuel inflow pipe 56a branches from the fuel discharge pipe 55, and this regulator fuel inflow pipe 56a is connected to the regulator fuel inflow hole Ra of the pressure regulator R.
Further, the regulator fuel discharge hole Rb communicates with the fuel tank T via the regulator fuel discharge pipe 56b.
The throttle body K including the strainer S, the fuel pump P, the pressure regulator R, and the fuel injection valve J, as described above, is a narrow storage space for a motorcycle that is limited by the body frame, the engine E, the air cleaner A, the fuel tank T, the seat, and the like. Placed inside.
When the fuel pump P is driven, the fuel in the fuel tank T flows down through the fuel inflow pipe 54, foreign matter is removed from the fuel by the strainer S, and clean fuel is supplied to the fuel pump through the pump suction path Pa. Inhaled into P.
The fuel boosted by the pump section in the fuel pump P is discharged into the fuel discharge pipe 55 from the pump discharge path Pb, and a part of the fuel in the fuel discharge pipe 55 is supplied to the regulator inflow pipe 56a, The fuel is supplied into the pressure regulator R through the regulator fuel inflow hole Ra, and is regulated to a predetermined fuel pressure by the pressure regulator R.
Thus, fuel having a predetermined fuel pressure is supplied to the fuel injection valve J through the fuel discharge pipe 55. The fuel injection valve J supplies the desired fuel to the throttle body K based on the injection signal from the ECU. Injection is supplied into the intake passage 50.
The surplus fuel in the pressure regulator R is returned again into the fuel tank T through the regulator fuel discharge hole Rb and the regulator fuel discharge pipe 56b.

According to such a conventional in-line type fuel supply device, the fuel pump P, the strainer S, and the pressure regulator R are separately arranged. Therefore, when the individual parts are arranged in the limited storage space of the motorcycle, the arrangement is made. The degree of freedom is hindered.
In addition, the individual parts need to be fixed through the respective attachment members, which increases the number of attachment members and the attachment work, and cannot effectively reduce the manufacturing cost.
Further, when performing maintenance work on the parts, it is necessary to remove each part, and maintenance workability cannot be particularly improved.

  The present invention has been made in view of the above problems, and a fuel pump, a strainer, and a pressure regulator are integrally formed in advance to improve mounting on a motorcycle, reduce the number of parts, and improve mounting and maintenance workability. The present invention provides an in-line type fuel supply device that can be used particularly for a motorcycle.

In order to achieve the above object, the in-line fuel supply apparatus for a motorcycle according to the present invention forms a pump storage chamber by a bottomed cup-shaped pump body and a pump cover that closes an opening of the pump body, Opening a fuel intake hole connected to the fuel tank below the locking step in the pump storage chamber and opening a fuel discharge hole connected to the fuel tank above the locking step,
On the other hand, one end of the pump cover opens into the pump storage chamber through the discharge passage insertion hole,
A fuel discharge hole having the other end connected to the fuel injection valve, a regulator storage chamber having one end opened in the pump storage chamber and the other end connected to the fuel discharge hole via the regulator fuel inflow passage are formed,
A fuel pump disposed in the pump storage chamber is supported by the locking step portion and the pump cover, and a strainer connected to the pump suction passage of the fuel pump is formed in the pump storage chamber below the locking step portion. It is arranged in the fuel inflow chamber, the pump discharge passage is inserted into the discharge passage insertion hole of the pump cover, the pressure regulator is inserted into the regulator cover storage chamber of the pump cover, and the regulator fuel inflow hole of the pressure regulator is inflow into the regulator fuel. The first feature is that the regulator fuel discharge hole is connected to the annular fuel chamber formed by the fuel pump and the pump storage chamber via the regulator storage chamber.

  According to the present invention, in addition to the first feature, the pressure regulator inserted and disposed in the regulator storage chamber is pressed and supported by a locking projection protruding from the upper end of the pump body into the regulator storage chamber. The second feature.

  Furthermore, in addition to the first feature, the present invention has a third feature that the annular fuel chamber and the fuel inflow chamber are connected to each other through an opening formed in the vicinity of the locking step portion.

According to the first feature of the present invention, a pump storage chamber is formed by the pump body and the pump cover, and the fuel pump is stored in the pump storage chamber.
A strainer is connected to the pump suction passage of the fuel pump. The strainer is disposed in a fuel inflow chamber formed below the locking step portion, and a fuel suction hole connected to the fuel tank opens into the fuel inflow chamber.
The pump discharge path of the fuel pump is inserted and disposed in the discharge path insertion hole of the pump cover, and the discharge path insertion hole communicates with the fuel discharge hole connected to the fuel injection valve.
On the other hand, the pressure regulator is accommodated in the regulator storage chamber, the regulator fuel inlet hole of the pressure regulator is connected to the fuel discharge hole through the regulator fuel inlet passage, and the regulator fuel discharge hole of the pressure regulator is pumped through the regulator storage chamber. The annular fuel chamber is connected to the body, and the annular fuel chamber is connected to the fuel tank through the fuel discharge hole.
According to the above, since the strainer, fuel pump, and pressure regulator are housed in the pump body and pump cover, these multiple parts can be made into a single assembly part, thereby arranging in a narrow housing space. The degree of freedom can be improved, and for example, the assembly to the two-wheeled vehicle can be completed by a single mounting operation in which the pump body is mounted to another part.
Therefore, the degree of freedom of arrangement on the motorcycle can be improved, and the mountability can be greatly improved. Further, since a plurality of assembling members and a plurality of assembling operations are not required, the number of parts of the assembling members and the number of assembling operations can be reduced, and the manufacturing cost can be reduced.
In addition, by removing the pump body from other parts, the strainer, fuel pump, and pressure regulator can be removed from the motorcycle at the same time, and maintenance workability can be improved.
Furthermore, since the strainer, fuel pump, and pressure regulator are placed in the pump body and pump cover and they are not directly exposed to the outside, there is no direct contact of the impingement material with the above parts, thus protecting the parts. More preferred.
Furthermore, since the parts are housed in the pump body and the pump cover, the appearance can be refreshed and the appearance shape can be changed as appropriate regardless of the part shape.

According to the second feature of the present invention, a regulator storage chamber is opened at the lower end of the pump cover, and the pressure regulator is inserted into the regulator storage chamber through the opening.
On the other hand, a locking projection protrudes from the upper end of the pump body. When the pump cover is disposed in contact with the upper end of the pump body, the locking projection of the pump body enters the pump housing chamber and is engaged. The upper end of the stop protrusion presses the pressure regulator, and the pressure regulator can be fixedly disposed in the pump storage chamber.
According to the above, a ring collar or the like for fixing the pressure regulator is not required, and the ring collar is not required to be inserted, so that the manufacturing cost can be reduced.

According to the third feature of the present invention, the annular fuel chamber and the fuel inflow chamber are communicated with each other through an opening provided in the vicinity of the locking step.
According to this, the bubbles contained in the fuel flowing into the fuel inflow chamber from the fuel suction hole move upward by the buoyancy of the bubbles themselves in the fuel inflow chamber having a large chamber volume, and through the opening, the annular fuel chamber Spill to
Accordingly, such bubbles are not sucked into the fuel pump via the strainer, and the fuel can be discharged stably from the fuel pump continuously.
In the annular fuel chamber, there is a fuel flow toward the fuel discharge hole, and the bubbles flowing into the annular fuel chamber by the above are discharged from the fuel discharge hole into the fuel tank by the fuel flow, and the annular fuel chamber. The bubbles will not be filled.

An embodiment of an inline fuel supply device for a motorcycle according to the present invention will be described below with reference to FIG.
Reference numeral 1 denotes a bottomed cup-shaped pump body in which an opening 1b is opened in an upper flange 1a, and a locking step 1c protruding inward is formed below the pump body.
A fuel suction hole 2 is opened in the pump body 1 below the locking step 1c, and a fuel discharge hole 3 is formed in the pump body 1 above the locking step 1c.
Reference numeral 4 denotes a pump cover having a flange portion 4a that is in contact with the flange portion 1a of the pump body 1 and closes the opening portion 1b of the pump body 1. The discharge cover insertion hole 5 extends upward from the lower surface of the flange portion 4a. A regulator insertion chamber 6 is formed.
The discharge passage insertion hole 5 includes a large-diameter hole 5 a and a small-diameter hole 5 b that are connected to each other, and the large-diameter hole opens downward facing the opening 1 b of the pump body 1.
Further, the lower part of the regulator storage chamber 6 opens downward facing the opening 1 b of the pump body 1.
Furthermore, the pump cover 4 is provided with a fuel discharge hole 7 that opens to the side, and the upper end of the small-diameter hole 5b of the discharge passage insertion hole is connected to the fuel discharge hole 7 so that a regulator storage chamber is formed. The upper end of 6 is connected to the fuel discharge hole 7 via the regulator fuel inflow passage 8.

Next, the fuel pump P and the pressure regulator R accommodated in the pump body and the pump cover 4 will be described.
Conventional fuel pumps P and pressure regulators R themselves are used.
The fuel pump P includes a pump unit and a motor unit that rotationally drives the pump unit, and a pump suction path Pa for supplying fuel into the pump unit is formed below the pump unit. A pump discharge path Pb is formed for discharging the discharged fuel to the outside.
A strainer S is fitted and disposed in the pump suction path Pa of the fuel pump P.
In the pressure regulator R, the upper housing 9 and the lower housing 10 are integrally joined at the flange portion 11, and the regulator fuel inflow hole 12 formed in the upper housing 9 has a valve seat 13 and the lower housing. Open in the body 10.
Reference numeral 14 denotes a valve body that faces the valve seat 13 and opens and closes the valve seat 13. The valve body 14 is attached to a side that closes the valve seat 13 by a regulator spring 15 that is contracted in the lower housing 10. Be forced.
Reference numeral 16 denotes a regulator fuel discharge hole formed in the bottom of the lower casing 10.

The fuel pump P and the pressure regulator R provided with the strainer are assembled as follows.
First, the pressure regulator R is attached to the pump cover 4.
The pressure regulator R is inserted into the regulator storage chamber 6 from the lower opening of the regulator storage chamber 6, and at this time, the upper surface of the flange portion 11 is disposed in contact with a locking step portion 6 a formed in the regulator storage chamber 6. A first seal ring 17 is disposed in a contracted manner between the outer periphery of the housing and the regulator storage chamber.

On the other hand, the fuel pump P including the strainer S is disposed in the pump body 1 through the opening 1b of the pump body 1, and at this time, a cushion member 18 made of, for example, a rubber plate material is disposed on the lower surface Pc of the fuel pump P. The fuel pump P is disposed on the locking step portion 1c via the cushion member 18, and the fuel pump P is supported between the locking step portion 1c and the lower surface of the flange portion 4a of the pump cover 4. .
According to the above, the fuel inflow chamber 19 is formed between the lower surface Pc of the fuel pump P including the cushion member 18 and the bottom 1d of the pump body 1, and the strainer S is disposed in the fuel inflow chamber 19. The fuel suction hole 2 opens into the fuel inflow chamber 19.

Next, the flange 4a of the pump cover 4 provided with the pressure regulator R is disposed in contact with the flange 1a of the pump body 1 in which the fuel pump is accommodated.
According to this, the opening 1 b of the pump body 1 is closed by the flange 4 a of the pump cover 4 to form the pump storage chamber 20, and the fuel pump P is disposed in the pump storage chamber 20.
The pump discharge passage Pb of the fuel pump P is inserted and disposed in the discharge passage insertion hole 5 of the pump cover 4, and the pump discharge passage Pb is supported above the pump discharge passage Pb with a small gap in the small diameter hole 5b. A ring collar 21 is disposed between Pb and the large-diameter hole 5a.
Reference numeral 22 denotes a second seal ring that is contracted between the fuel discharge passage Pb and the large-diameter hole 5a.
Further, a locking projection 1e is integrally formed by projecting from the upper surface of the collar 1a of the pump body 4 into the regulator housing chamber 6, and the collar 1a of the pump body 1 and the collar 4a of the pump cover 4 are integrally formed. The locking projection 1e enters the regulator storage chamber 6, and the upper end of the locking projection 1e points the flange 11 of the pressure regulator R toward the locking step 6a of the regulator storage chamber 6. Thus, the pressure regulator R is disposed in the pump cover 4 so as not to escape.

Thus, the fuel pump P is disposed in the pump storage chamber 20, the strainer S is disposed in the fuel inflow chamber 19, and the pressure regulator R is disposed in the regulator storage chamber 6.
Further, the lower opening of the regulator storage chamber 6 is connected to the annular fuel chamber 23 formed by the fuel pump P and the pump storage chamber 20 via the opening 16. The discharge hole 3 opens.
The fuel inflow chamber 19 is connected to the annular fuel chamber 23 through an opening 24 formed in the vicinity of the locking step portion 1c. The opening 24 may be formed in the cushion member 18.

The fuel supply device formed as described above is arranged with fuel as shown in FIG.
The fuel suction hole 2 and the fuel tank T are connected by a fuel inflow pipe 30, and the fuel discharge hole 3 and the fuel tank T are connected by a regulator fuel discharge pipe 31.
The fuel discharge hole 7 and the fuel injection valve J are connected to each other through a fuel discharge pipe 32.
The engine E, the intake pipe 53, the throttle body K, and the air cleaner A are those shown in FIG.

According to the above, during operation of the engine, the fuel stored in the fuel tank T is supplied into the fuel inflow chamber 19 via the fuel inflow pipe 30 and the fuel suction hole 2, and the fuel that has flowed into the fuel inflow chamber 19 The foreign matter is removed by the strainer S and is sucked into the fuel pump P through the pump suction path Pa.
In the fuel pump P, the fuel is sucked into the pump unit disposed therein and the pressure is increased in the pump unit, and the boosted fuel is discharged into the fuel discharge hole 7 through the pump discharge path Pb. Is done.
A part of the fuel flowing in the fuel discharge hole 7 acts on the regulator fuel inflow hole 12 of the pressure regulator R through the regulator fuel inflow passage 8. The fuel in the regulator fuel inflow hole 12 is Acting on the body 14, the valve body 14 is separated from the valve seat 13, and the spring force of the regulator spring 15 is balanced with the set pressure.
According to the above, the fuel pressure flowing in the fuel discharge hole 7 is adjusted to a desired set pressure, and this adjusted fuel is supplied to the fuel injection valve J via the fuel discharge pipe 32.
During pressure regulation of the pressure regulator, the fuel that flows into the lower housing 10 from the regulator fuel inflow hole 12 through the valve seat 13 is discharged into the annular fuel chamber 23 through the regulator fuel discharge hole 16, Further, the fuel in the annular fuel chamber 23 is returned again into the fuel tank T through the fuel discharge hole 3 and the regulator fuel discharge pipe 31.

According to the in-line fuel supply apparatus constructed as described above, the fuel pump P, the strainer S, and the pressure regulator R are housed and arranged in a single case formed by the pump body 1 and the pump cover 4, so that they can be mounted on a motorcycle. In some cases, a single case may be assembled as an assembly part, and the degree of freedom of arrangement in a narrow storage space such as a motorcycle can be improved.
Further, the case can be attached to the two-wheeled vehicle with a single attachment work by a single attachment member, and the manufacturing cost can be reduced.
In addition, since the fuel pipe of the case is formed with three pipes of the fuel inflow pipe 30 connected to the fuel tank T, the regulator fuel discharge pipe 31, and the fuel discharge pipe 32, the pipe is simple and the pipe layout is improved. It is possible to improve the connection workability of piping as well as to improve.
Further, when the fuel pump P, the strainer S, and the pressure regulator R are accommodated in the case, the respective components are protected by the case so that they do not collide with the impingement material and are not damaged. It is preferable in a motorcycle.
In addition, the appearance of the case can be clearly organized and the design of the case can be freely selected without being influenced by the configuration housed therein, so that a great effect is exerted on the body design of the motorcycle.
Further, by removing the case from the two-wheeled vehicle, the fuel pump P, the pressure regulator R, and the strainer S can be taken out of the two-wheeled vehicle at the same time, thereby improving the maintainability of these configurations.
Furthermore, the surplus fuel discharged from the pressure regulator R is returned to the fuel tank T through the annular fuel chamber 23, the fuel discharge hole 3, and the regulator fuel discharge pipe 31, so that the temperature rise of the motor portion is effectively suppressed. In addition, it is possible to suppress external leakage of noise generated in the fuel pump P.

Further, according to the fact that the fuel inflow chamber 19 and the annular fuel chamber 23 are communicated with each other through the opening 24 provided in the vicinity of the locking step portion 1c (in other words, provided above the fuel inflow chamber 19), The air bubbles contained in the fuel entering the fuel inflow chamber 19 from the fuel are separated from the fuel in the fuel inflow chamber 19 having an enlarged chamber volume with respect to the fuel inflow hole 2, and the air bubbles pass through the opening 24. And discharged into the annular fuel chamber 23.
Accordingly, bubbles do not flow into the fuel pump P via the strainer S and the pump suction path Pa, and the fuel pump P can continuously supply fuel stably over a long period of time.
The bubbles that flow into the annular fuel chamber 23 are discharged from the annular fuel chamber 23 toward the fuel tank T by the fuel flow from the annular fuel chamber 23 toward the fuel discharge hole 3. Stays in the annular fuel chamber 23 and does not fill.

  Further, when the pressure regulator R disposed in the regulator storage chamber 6 is pressed and supported by the locking projection 1e formed integrally with the pump body 1, there is no need to prepare a pressing member such as a ring collar as a separate member. This can reduce the number of parts and simplify the assembly.

The principal part longitudinal cross-sectional view which shows one Example of the in-line type fuel supply apparatus of this invention. The fuel piping figure at the time of mounting to the two-wheeled vehicle of the in-line type fuel supply apparatus of this invention. The fuel piping figure of the conventional in-line type fuel supply apparatus.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Pump body 2 Fuel intake hole 3 Fuel discharge hole 4 Pump cover 5 Discharge path insertion hole 6 Regulator discharge chamber 7 Fuel discharge hole 8 Regulator fuel inflow path 16 Regulator fuel discharge hole 20 Pump storage chamber P Fuel pump R Pressure regulator S Strainer T Fuel tank

Claims (3)

  A pump housing chamber 20 is formed by the bottomed cup-shaped pump body 1 and the pump cover 4 that closes the opening 1b of the pump body 1, and the fuel is disposed below the locking step 1c in the pump housing chamber 20. A fuel suction hole 2 connected to the tank T is opened and a fuel discharge hole 3 connected to the fuel tank T is opened above the locking step portion 1c. On the other hand, one end of the pump cover has a discharge passage insertion hole 5. And the other end is connected to the fuel injection valve J, the other end is opened to the pump storage chamber 20, and the other end is connected to the fuel discharge passage 8 via the regulator fuel inflow passage 8. 7 is formed, and the fuel pump P disposed in the pump storage chamber 20 is supported by the locking step 1c and the pump cover 4 and is connected to the pump suction path Pa of the fuel pump P. Contact The strainer S is disposed in the fuel inflow chamber 19 formed in the pump storage chamber 20 below the locking step portion 1c, and the pump discharge path Pb is inserted and disposed in the discharge path insertion hole 5 of the pump cover 4, Further, the pressure regulator R is inserted and disposed in the regulator storage chamber 6 of the pump cover 4, the regulator fuel inflow hole 12 of the pressure regulator R is connected to the regulator fuel inflow passage 8, and the regulator fuel discharge hole 16 is connected to the regulator storage chamber 6. An in-line fuel supply device for a motorcycle, which is in communication with an annular fuel chamber 23 formed by the fuel pump P and the pump storage chamber 20.   2. The two-wheeled vehicle according to claim 1, wherein the pressure regulator R inserted and disposed in the regulator housing chamber is pressed and supported by a locking projection 1e projecting into the regulator housing chamber 6 from the upper end of the pump body 1. In-line fuel supply device. The in-line fuel supply device for a motorcycle according to claim 1, wherein the annular fuel chamber and the fuel inflow chamber (19) are connected to each other through an opening (24) formed in the vicinity of the locking step portion (1c).

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