CN1441160A - Fuel pump assembly of vehicle - Google Patents

Abstract

A fuel pump unit for vehicles that can significantly shorten the overall length and discharge vapors generated inside to the outside. The electric fuel pump (13) and fuel filter (14) housed in the assembly box (12) are arranged in a manner that their longitudinal axes are parallel to each other, and the gasification separation chamber (26) and the electric fuel pump (13) and fuel filter One longitudinal end of the device (14) is adjacently arranged in the assembly case (12), and the gasification separation chamber (26) contains the gas produced by the electric fuel pump (13) and the fuel filter (14). Vaporized fuel and the vaporized product separated from the fuel is sent to the fuel recovery port (22).

Description

Fuel pump components for vehicles

technical field

The present invention relates to a fuel pump unit for vehicles such as motorcycles, and more particularly, to an electric fuel pump and a fuel filter installed in series on a flow path connecting a fuel inlet and a fuel outlet, and an electric fuel pump and a fuel filter installed in series to connect a fuel outlet and a fuel recovery unit. The fuel pressure regulator on the pressure regulating passage between the ports is an improvement of the fuel pump assembly housed in the assembly case, and the assembly case is opened to the outside and provided with a fuel inlet for receiving fuel from a fuel tank, and fuel injection to the engine. The fuel outlet valve supplies fuel and the fuel recovery port returns residual fuel to the fuel tank.

Background technique

Such a fuel pump unit is known, for example, as disclosed in JP-A-2001-248510.

In the conventional fuel pump unit of this type, since the electric fuel pump and the fuel filter are connected in series on the same axis, the overall length becomes very long, and it is difficult to arrange it compactly when mounted on the engine. In addition, when the fuel pump unit is placed close to the engine, it may be affected by the radiant heat of the engine, and vapors may be generated inside, which may hinder the hot start or high-speed operation of the engine.

The present invention has been developed in view of the above problems, and an object of the present invention is to provide a fuel pump unit for the vehicle that can significantly reduce the overall length and that can remove vapors generated inside to the outside.

In order to achieve the above object, the first aspect of the present invention provides a fuel pump assembly for a vehicle, an electric fuel pump and a fuel filter installed in series on the flow path connecting the fuel inlet and the fuel outlet, and an electric fuel pump installed on the flow path connecting the fuel outlet and the fuel outlet. The fuel pressure regulator on the pressure regulating passage between the recovery ports is accommodated in the assembly case, and the assembly case is opened to the outside and provided with a fuel inlet for receiving fuel from the fuel tank, and a fuel inlet for supplying fuel to the fuel injection valve of the engine. outlet and a fuel recovery port that returns residual fuel to the fuel tank. The electric fuel pump and the fuel filter are arranged in such a way that their longitudinal axes are parallel to each other, and the gasification separation chamber is arranged adjacent to one longitudinal end of the electric fuel pump and the fuel filter in the assembly box, so The vaporization separation chamber accommodates fuel including vapors generated by the electric fuel pump and the fuel filter, and sends the vapors separated from the fuel to the fuel recovery port.

According to the first aspect of the present invention, by arranging the electric fuel pump and the fuel filter in parallel, the overall length of the unit case can be greatly shortened, and the fuel pump unit can be miniaturized.

The vapors generated in the fuel filter and the electric fuel pump are stored together with the fuel in the vapor separation chamber, where fuel and vapors are separated, and the vapors float and are sent to the fuel recovery port, so they can be sent to the fuel recovery port. The fuel injection valve supplies fuel in good condition without vapors, which can always ensure the stable running state of the engine.

In the second aspect of the present invention, on the basis of the first aspect, the gasification discharge hole on the upper part of the gasification separation chamber is opened to the pressure regulating passage downstream of the fuel pressure regulator, and the residual fuel is used to pass through the The injection effect generated by the pressure regulating passage provides a negative pressure to the vapor discharge hole.

According to the second aspect of the present invention, when using the injection effect to provide negative pressure to the gasification discharge hole, it can effectively promote the discharge of gasification from the gasification separation chamber to the pressure regulating passage, and then also promote the discharge of the gasification separation chamber. gasification separation.

In the third aspect of the present invention, on the basis of the first or second aspect, the fuel filter is installed on the flow path between the fuel inlet and the electric fuel pump.

According to the third aspect, the electric fuel pump can incorporate a brushless motor, and the fuel filter can be an inexpensive low-pressure fuel filter.

In the fourth aspect of the present invention, on the basis of the first aspect or the second aspect, the component box is communicated with the fuel inlet, filled with fuel, and the electric fuel pump is immersed in the fuel. And the fuel filter is installed on the flow path between the electric fuel pump and the fuel outlet.

According to the fourth aspect of the present invention, the electric motor built in the electric fuel pump can be cooled by the fuel in the component case. Therefore, even if the motor is a normal motor with brushes, the brush sliding portion thereof can be effectively cooled by fuel. At this time, even if abrasive powder generated by the brush sliding part is mixed into the fuel in the unit case and sucked into the electric fuel pump, the abrasive powder is captured by the fuel filter and prevented from flowing out toward the fuel injection valve.

In addition, in the fifth aspect of the present invention, on the basis of any one of the first to fourth aspects of the present invention, the component case is adjacent to one side of the engine intake pipe, and the component case and the suction pipe The longitudinal axes of the trachea are generally arranged at right angles to each other.

In addition, the intake pipe corresponds to the throttle body 6 in an embodiment of the present invention described later.

According to this fifth aspect, the overall length of the fuel pump assembly can be shortened, and at the same time, the miniaturization of the engine air intake system can be brought about.

Description of drawings

FIG. 1 is a side view of main parts of an automatic two-wheeled vehicle with a fuel pump assembly according to Embodiment 1 of the present invention;

Fig. 2 is an enlarged longitudinal sectional side view of part 2 of Fig. 1;

Fig. 3 is the 3-3 line sectional view of Fig. 2;

Fig. 4 is the 4-4 line sectional view of Fig. 3;

FIG. 5 is an overall schematic view of the fuel supply system of the automatic two-wheeled vehicle including the above-mentioned fuel pump assembly;

Fig. 6 is a diagram illustrating the structure and function of the transverse cut-off valve;

7 is an overall schematic view of a fuel supply system of a motorcycle having a fuel pump unit according to Embodiment 2 of the present invention.

Detailed ways

Embodiments of the present invention will be described below based on the embodiments of the present invention shown in the drawings.

The description starts with the first embodiment of the present invention shown in FIGS. 1 to 7 .

In FIG. 1 , a main body frame 1 of a motorcycle M as a vehicle is composed of a front pipe 1f extending rearward and downward from a head pipe (not shown) and a rear pipe 1r extending rearward from its rear end. A four-stroke engine E disposed below is mounted on the front pipe 1f, and a fuel tank T is provided on the rear pipe 1r.

In the engine E, the cylinder head 2 is directed toward the front of the vehicle, and the cylinder block 3 is arranged substantially horizontally. On the upper end surface of the cylinder head 2, a throttle body 6 having an air intake passage 5 connected to the air intake port 4 is joined. , an air cleaner 7 is connected to the upstream end of the throttle body 6 . An exhaust pipe 9 connected to an exhaust port 8 is joined to the lower end surface of the cylinder head 2 .

The throttle valve body 6 pivotally supports the throttle valve 10 for opening and closing the intake passage 5, and on the downstream side of the throttle valve 10, it is installed on the injection valve mounting boss 11 formed on the side wall of the throttle valve body 6. There is an electromagnetic fuel injection valve I that injects fuel toward the intake port 4 . A fuel pump unit Mp that supplies fuel from a fuel tank T to the fuel injection valve I is attached to the throttle body 6 .

First, the overall structure of the fuel pump module Mp will be described using the overall schematic diagram of FIG. 6 .

The fuel pump assembly Mp has an assembly case 12 , an electric fuel pump 13 accommodated in the assembly case 12 , a low-pressure fuel filter 14 , a fuel pressure regulator 15 and a transverse shutoff valve 16 as main structural components.

A fuel inlet 20, a fuel outlet 21, and a fuel recovery port 22 are opened on the outer surface of the assembly case 12, and the fuel inlet 20 is connected with a fuel supply pipe 23 extending from the bottom of the fuel tank T. Fuel flows into the fuel inlet 20 by gravity.

The fuel recovery port 22 is connected to a fuel recovery pipe 24 terminating in a gas phase portion opened in the fuel tank T, and the fuel outlet 21 is connected to the inlet of the fuel injection valve I.

A main chamber 25 and a vaporized product separation chamber 26 adjacent to the main chamber 25 via a partition wall 27 are formed in the unit case 12 , and the main chamber 25 accommodates the electric fuel pump 13 and the fuel filter 14 . At this time, the inlet pipe 28 at one longitudinal end of the fuel filter 14 is connected to the fuel inlet 20 , and the outlet pipe 29 at the other longitudinal end opens to the gasification separation chamber 26 . The electric fuel pump 13 opens a suction pipe 30 and a vapor discharge pipe 31 at one longitudinal end to the vapor separation chamber 26 , and connects a discharge pipe 32 at the other longitudinal end with the inlet hole 33 of the transverse shutoff valve 16 .

The outlet hole 34 of the transverse cut-off valve 16 communicates with the fuel outlet 21 through the fuel injection passage 35, and a valve is provided in the middle of the fuel injection passage 35 to prevent fuel from flowing back from the fuel outlet 21 to the side of the transverse cut-off valve 16. Check valve 36.

A pressure regulation passage 40 is branched from the injection fuel passage 35 downstream of the check valve 36 to the fuel recovery port 22 , and the fuel pressure regulator 15 is mounted on the pressure regulation passage 40 . This fuel pressure regulator 15 has: a valve seat 42 formed in the middle of the pressure regulating passage 40 and directed toward the downstream side; The valve body 43 presses against the pressure regulating spring 44 on the valve seat 42 side. When the discharge pressure of the electric fuel pump 13 reaches a predetermined value or more, the valve body 43 is separated from the valve seat 42 to release the residual pressure to the fuel recovery port 22 .

A gasification discharge hole 45 penetrating through the top wall of the gasification separation chamber 26 is provided on the inner surface opening of the pressure regulating passage 40 downstream of the fuel pressure regulator 15 . The injection effect provides negative pressure to the vapor discharge hole 45 .

In addition, in FIG. 1 , an electronic control unit 47 is arranged in front of the air cleaner 7 . The electronic control device 47 controls the fuel injection valve 1, the electric fuel pump 13 and the ignition coil according to the input signals such as the engine speed Ne, the engine temperature (such as the lubricating oil temperature) Te, the opening degree Th of the throttle valve 10, and the crankshaft position Cp. (not shown) etc.

Thus, when the engine E is running, the fuel in the fuel tank T flows down through the fuel supply pipe 23 , reaches the fuel inlet 20 of the fuel pump assembly Mp, is filtered by the fuel filter 14 , and flows into the gasification separation chamber 26 . As described above, since the fuel is supplied to the fuel inlet 20 by gravity, when gasification is generated in the fuel supply pipe 23, the gasification naturally floats toward the fuel tank T side. The fuel flowing into the gasification separation chamber 26 is sucked from the inlet pipe 28 by the operation of the electric fuel pump 13, and is pressure-fed to the discharge pipe 32, and then, through the transverse stop valve 16 and the check valve 36, is injected from the fuel outlet to the fuel. The valve I supplies, and injects from the valve I to the intake port 4.

During this period, the vapors generated in the fuel filter 14 and the electric fuel pump 13 are discharged to the vaporization separation chamber 26, and the fuel and the vapors are separated in the chamber 26, so that the vapors float and are discharged from the vaporization discharge hole 45. To the pressure regulating passage 40 downstream of the fuel pressure regulator 15 .

However, in the pressure regulating passage 40, as mentioned above, the remaining fuel with the fuel pressure regulator 15 opened passes through at a high speed, and uses its injection effect to provide negative pressure to the gasification discharge hole 45, so the gasification is effectively promoted. The discharge of the gaseous compound separation chamber 26 to the pressure regulating passage 40 also promotes the gaseous product separation function of the gaseous compound separation chamber 26 . In this way, when the vaporized substance is discharged from the fuel filter 14 and the electric fuel pump 13, fuel in a good state without vaporized substance can be supplied to the fuel injection valve I, and a stable operating state of the engine E can always be ensured.

The fuel and vapors passing through the pressure regulating passage 40 are discharged from the fuel recovery port 22 through the fuel recovery pipe 24 to the gaseous phase in the fuel tank T, so the gaseous matter can be separated from the fuel in the gaseous phase.

The traversing shut-off valve 16 will be described below using FIG. 6 .

As shown in FIG. 6(N), the transverse shutoff valve 16 has a cylindrical first valve chamber 55 that is inclined upward to the left in the upright state of the motorcycle M, and is inclined upward to the right relative thereto. The cylindrical second valve chamber 56, the upper end of the first valve chamber 55 is connected to the middle part of the second valve chamber 56. First and second valve seats 55a, 56a are respectively formed on the respective upper parts of the first and second valve chambers 55, 56. The inlet hole 33 is opened on the lower part of the first valve seat 55a, and the upper part of the second valve seat 56a is opened. There is said outlet hole 34 . The respective lower ends of the first and second valve chambers 55 , 56 are closed by spherical plugs 59 , 60 . The first and second valve chambers 55, 56 accommodate spherical valve bodies 58, 59 that can be seated on the first and second valve seats 55a, 56a, respectively. The respective lower ends of the first and second valve chambers 55 , 56 are closed by plug bodies 59 , 60 .

In this way, as shown in FIG. 6(N), in the upright state of the motorcycle M, the first and second valve bodies 58, 59 are separated from the first and second valve seats 55a, 56a by their own weight and remain on the plugs. Body 59,60. Therefore, the inlet hole 33 and the outlet hole 34 are communicated to allow fuel supply from the electric fuel pump 13 to the fuel injection valve 1 .

However, in case the motorcycle M turns leftward or rightward, as shown in FIG. 6(L) or (R), along with the first valve chamber 55 or the second valve chamber 56 To be approximately horizontal, the first valve body 57 or the second valve body 58 is seated on the first valve seat 55a or the second valve seat 56a by using its inertia, and in any case, the inlet hole 33 and the outlet hole 34 will be blocked. . Thus, when the first valve body 57 or the second valve body 58 is seated on the first valve seat 55a or the second valve seat 56a, its seated state is held fixed by the fuel pressure on the inlet hole 33 side. Therefore, even if damage occurs on the side of the fuel injection valve I due to the lateral rotation of the motorcycle M, fuel can be prevented from being injected from the fuel outlet 21 before it happens.

2 to 5 show the embodiment of the fuel pump module Mp described above.

In FIGS. 2 and 3 , the module case 12 has a case main body 12a forming a main chamber 25, and a case cover 12b forming a gasification separation chamber 26 is joined to the case main body 12a with a partition wall 27 interposed therebetween. fan-shaped structure. At this time, the sealing members 48, 48 are installed between the joint surfaces of the box main body 12a, the partition wall 27, and the box cover 12b. A cylindrical electric fuel pump is arranged in the center of the sector in the main chamber 25 . The arc-shaped fuel filter 14 is arranged along the fan-shaped arc portion in the main chamber 25 . Thus, the electric fuel pump 13 and the fuel filter 14 are arranged in the main chamber 25 so that their longitudinal axes are parallel to each other. Therefore, the overall length of the module case 12 can be greatly shortened, and the cross-sectional shape thereof is substantially fan-shaped, so that the size of the fuel pump module Mp can be realized.

As shown in Figures 2 and 3, a pair of mounting bosses 49, 49 arranged longitudinally are formed on the outer side of the arc-shaped part of the box body 12a, and these bosses 49, 49 are fixed on the throttle valve by bolts 50, 50. On one side wall of the main body 6. At this time, the longitudinal axis X of the assembly case 12 is arranged at right angles to the axis Y of the intake passage 5 of the throttle body 6 . With this configuration, the overall length of the fuel pump module Mp can be shortened, and accordingly, the air intake system of the engine E can be downsized.

A fuel inlet 20 is provided on the rear side and a fuel outlet 21 is provided on the front side on the side wall of the tank main body 12a. In particular, the fuel inlet 20 is provided on a cap 51 integrally formed on the front wall of the tank main body 12a and fitted into the head of the fuel injection valve 1. The fuel inlet 20 is connected to the fuel inlet of the fuel injection valve 1. Since there is direct communication, there is no need to install piping between the fuel outlet 21 and the fuel injection valve 1, and the fuel piping can be simplified.

A transverse shutoff valve 16 is assembled on the box main body 12a.

A fuel pressure regulator 15 is assembled on the tank cover 12b, and a fuel recovery port 22 is provided on the rear wall thereof.

As mentioned above, when the fuel inlet 20 and the fuel recovery port 22 are arranged on the rear wall of the assembly box 12, the fuel supply pipe 23 and the fuel recovery pipe 24 connected to them can be arranged at the center of the motorcycle M. part, which is beneficial to avoid interference with other components.

Other configurations are the same as those shown in the overall schematic diagram of FIG. 5 , and in FIGS. 2 to 5 , the parts corresponding to those in FIG. 5 are given the same reference numerals.

Next, Embodiment 2 of the present invention shown in FIG. 7 will be described.

In this embodiment 2, a filter 61 is installed on the fuel inlet 20 of the assembly case 12, and the main chamber 25 communicates with the fuel inlet 20, and the fuel from the fuel tank T is filled into the main chamber 25, so that the electric fuel pump 113 and The fuel filter 114 is immersed in the fuel. The electric fuel pump 113 and the fuel filter 114 are arranged in the main chamber 25 in parallel with the longitudinal axis as in the above-mentioned embodiments. The electric fuel pump 113 opens the suction pipe 30 into the main chamber, sucks the fuel in the main chamber 25 , and sends it to the fuel filter 114 through the discharge pipe 32 under pressure. Therefore, the fuel filter 114 in this Embodiment 2 must be a high-pressure type. The high-pressure fuel filtered by the fuel filter 114 is sent to the traverse stop valve 16 through the outlet pipe 29, and then injected from the fuel injection valve I to the intake port 8 of the engine E through the same route as in the above-mentioned embodiment.

The electric fuel pump 113 houses a conventional brushed motor. Therefore, the brush sliding part and the whole motor are cooled by the fuel in the main chamber 25 . At this time, the abrasion powder generated by the sliding part of the brush may be discharged into the main chamber 25 and sucked into the electric fuel pump 113 together with the fuel. will flow into the I side of the fuel injection valve.

The upper part of the main chamber 25 communicates with the adjacent gasification separation chamber 26 through the belt hole 62 , and the gasification generated in the main chamber 25 floats and moves to the gasification separation chamber 26 . The vapor discharge pipe 31 of the electric fuel pump 113 is opened to the vapor separation chamber 26 as in the above-described embodiment.

The other structures are the same as those of the above-mentioned embodiment, and the parts corresponding to those of the above-mentioned embodiment in FIG. 7 are given the same reference numerals, and their descriptions are omitted.

The present invention is not limited to the above-described embodiments, and various design changes can be made without departing from the gist thereof. For example, when the engine E has a plurality of cylinders, the throttle body 6 can also be connected to the cylinder head 2 through the intake manifold, and the fuel injection valve corresponding to each cylinder can be installed on the intake manifold. , the fuel pump assembly Mp can also be installed on the suction manifold.

As described above, the first aspect of the present invention provides a fuel pump assembly for a vehicle. An electric fuel pump and a fuel filter installed in series on a flow path connecting a fuel inlet and a fuel outlet, and a fuel filter installed on a flow path connected to a fuel outlet and a fuel recovery The fuel pressure regulator on the pressure regulating passage between the ports is accommodated in the assembly case, and the assembly case is opened to the outside and provided with a fuel inlet for receiving fuel from the fuel tank and a fuel outlet for supplying fuel to the fuel injection valve of the engine. And return the remaining fuel to the fuel recovery port of the fuel tank. The electric fuel pump and the fuel filter are arranged so that their longitudinal axes are parallel to each other, and the gasification separation chamber is arranged adjacent to one longitudinal end of the electric fuel pump and the fuel filter in the assembly box, The vaporization separation chamber accommodates fuel including vapors generated by the electric fuel pump and the fuel filter, and sends the vapors separated from the fuel to the fuel recovery port. Therefore, the overall length of the module case can be greatly shortened, and the size of the fuel pump module can be realized. Vaporization produced in the fuel filter and electric fuel pump is separated from the fuel in the vaporization separation chamber and sent to the fuel recovery port. Therefore, fuel in good condition without vaporization can be supplied to the fuel injection valve, and the engine can always be guaranteed. stable operating state.

In the second aspect of the present invention, on the basis of the first aspect, the gasification discharge hole on the upper part of the gasification separation chamber is opened to the pressure regulating passage downstream of the fuel pressure regulator, and the residual fuel is used to pass through the The injection effect generated by the pressure regulating passage provides a negative pressure to the vapor discharge hole. Therefore, not only can the gasification be effectively promoted from the gasification separation chamber to the pressure regulating passage, but also the gasification separation in the gasification separation chamber can be promoted.

In the third aspect of the present invention, on the basis of the first or second aspect, the fuel filter is installed on the flow path between the fuel inlet and the electric fuel pump. Therefore, the electric fuel pump can be built with a brushless motor, and the fuel filter can be an inexpensive low-pressure fuel filter.

In the fourth aspect of the present invention, on the basis of the first aspect or the second aspect, the component box is communicated with the fuel inlet, filled with fuel, and the electric fuel pump is immersed in the fuel. And the fuel filter is installed on the flow path between the electric fuel pump and the fuel outlet. Therefore, even if the electric motor incorporated in the electric fuel pump is a normal motor with brushes, the brush sliding portion thereof can be effectively cooled by fuel. In addition, the wear powder generated by the sliding part of the brush can be captured by the fuel filter, and it can be prevented from flowing out toward the fuel injection valve.

In addition, in the fifth aspect of the present invention, on the basis of any one of the first to fourth aspects of the present invention, the component case is adjacent to one side of the engine intake pipe, and the component case and the suction pipe The longitudinal axes of the trachea are generally arranged at right angles to each other. Therefore, the overall length of the fuel pump unit can be shortened, and at the same time, the engine air intake system can be downsized accordingly.

Claims (5)

1, a kind of fuel pump components of vehicle, electric fuel pump (13 on the stream that connects between fuel inlet (20) and fuel outlet (21) will be installed in series, 113) and fuel filter (14,114), and the fuel pressure regulator (15) that is installed on the pressure regulation path that connects between fuel outlet (21) and the fuel recovery mouth (22) is housed in the assembly casing (12), on the described assembly casing (12) laterally opening be provided with the fuel inlet (20) that receives fuel from fuel pot (T), to the fuel outlet (21) of Fuelinjection nozzle (I) fueling of motor (E) and make residual fuel be back to the fuel recovery mouth (22) of fuel pot (T), it is characterized in that, described electric fuel pump (13,113) and described fuel filter (14,114) mode that is parallel to each other with its longitudinal axis disposes, vapour separation chamber (26) and described electric fuel pump (13,113) and fuel filter (14,114) a vertical end is in abutting connection with being arranged in the described assembly casing (12), accommodate and be included in described electric fuel pump (13 described vapour separation chamber (26), 113) and the fuel of the vapour that produces of described fuel filter (14, a 114) and vapour that separates from this fuel is sent to described fuel recovery mouth (22).

2, the fuel pump components of vehicle as claimed in claim 1, it is characterized in that, the vapour tap hole (45) on top, described vapour separation chamber (26) is opened on the described pressure regulation path (40) in described fuel pressure regulator (15) downstream, utilizes residual fuel to pass through the injection effect that this pressure regulation path (40) produces and provides negative pressure to described vapour tap hole (45).

3, the fuel pump components of vehicle as claimed in claim 1 or 2 is characterized in that, described fuel filter (14) is installed on the stream between described fuel inlet (20) and the described electric fuel pump (13).

4, the fuel pump components of vehicle as claimed in claim 1 or 2, it is characterized in that, be communicated with described fuel inlet (20) in the described assembly casing (12), be full of fuel, described electric fuel pump (113) impregnated in this fuel, and described fuel filter (114) is installed on the stream between this electric fuel pump (113) and described fuel outlet (21).

5, as the fuel pump components of each described vehicle of claim 1～4, it is characterized in that, one side adjacency of the sucking pipe (6) of described assembly casing (12) and motor (E), (X, Y) general arrangement meets at right angles the longitudinal axis of these assembly casings (12) and sucking pipe (6) mutually.

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