JP3093463B2 - Fuel supply device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a fuel supply system for supplying a fuel by free fall from a reserve tank disposed above a carburetor to a motor vehicle such as a motorcycle.

[0002]

2. Description of the Related Art Such a thing is known, for example,
JP-A-60-135287 and JP-A-60-12
No. 2265 is disclosed. Each of these includes a main tank having a lower bottom than the vaporizer, a reserve tank disposed above the vaporizer, and a fuel pump for pumping fuel from the main tank to the vaporizer.

[0003] In the former, the fuel pump continuously pumps oil into the reserve tank even during normal times (when fuel is present in the main tank), and supplies oil to the carburetor by natural fall. On the other hand, in the latter, the fuel supply passage is branched into two branches and connected to the carburetor and the reserve tank, respectively, so that the fuel is always stored in the reserve tank. It is shown that the oil is selectively supplied to the reserve tank.

[0004]

However, in the case of the above-mentioned conventional fuel supply system, it is difficult to obtain a sufficient fuel supply pressure (hereinafter referred to as "fuel pressure") because the fuel is supplied to the carburetor by natural fall even in a normal state. It is more susceptible to dynamic pressure such as running wind.

Further, in the above-mentioned Japanese Patent Application Laid-Open Publication No. Sho-59-193, in the case where a part of the fuel to be fed under pressure is always supplied to the reserve tank, the fuel pressure is liable to be reduced even if the angle fuel pump is used.

Further, in the type of selectively supplying oil, fuel cannot be stored in the reserve tank during traveling, and a special operation such as stopping the vehicle and supplying fuel to the reserve tank is required. The present invention aims to solve these problems.

[0007]

1 and 2 show the principle of the present invention. First, in FIG. 1, the fuel tank 1 includes a main tank 2 and a reserve tank 3, and the lowest part of the main tank 2 is located lower than the reserve tank 3.

A fuel pump 4 provided on the bottom side of the main tank 2
Is connected to a carburetor 6 via a fuel pipe 5. The fuel pipe 5 passes through the vicinity of the reserve tank 3 connected via a fuel cock 7 above the vaporizer 6.

The intermediate portion of the fuel pipe 5 is also connected to a regulator valve 8 provided in the reserve tank 3. The regulator valve 8 opens when the fuel pressure in the fuel pipe 5 exceeds a predetermined pressure, introduces a part of the fuel from the fuel pipe 5 into the reserve tank 3, and closes when the fuel pressure is lower than the predetermined pressure. ing.

The carburetor 6 is applied with dynamic pressure such as traveling wind from an intake duct 9 (hereinafter, this state is referred to as ram pressure supercharging). Further, a part of the dynamic pressure can be supplied into the reserve tank 3.

The reserve tank 3 may be formed integrally with the main tank 2 in the fuel tank 1 as in the embodiment described later, or may be formed separately from the main tank 2. Further, the fuel pump 4 may be arranged inside or outside the main tank 2. The fuel passage connecting the reserve tank 3 and the carburetor 6 may be separate from the fuel pipe 5 or may be integrated with a part thereof. Further, the position of the fuel cock 7 may be provided at a connection portion between the fuel pipe 5 and the regulator valve 8.

[0012]

FIG. 1 shows a normal state in which a sufficient amount of fuel is present in the main tank 2, in which fuel is pumped from a fuel pump 4 to a carburetor 6 via a fuel pipe 5. At this time, since the fuel pipe 5 communicates with the inside of the reserve tank 3 via the regulator valve 8, when the fuel pressure of the fuel pipe 5 becomes higher than a predetermined pressure, the fuel pipe 5 is automatically opened and a part of the fuel flows from the fuel pipe 5. Into the reserve tank 3 to store fuel.

At this time, if the fuel pressure in the fuel pipe 5 does not reach a predetermined pressure, the regulator valve 8 does not open, so that the fuel supplied to the carburetor 6 has a necessary and sufficient fuel pressure.

FIG. 2 shows a state in which the fuel in the main tank 2 is exhausted and the fuel in the reserve tank 3 is used (hereinafter referred to as a reserve state).
Supplies the fuel stored therein to the vaporizer 6 by natural fall. At this time, if the ram pressure is also applied to the reserve tank 3, the influence of the dynamic pressure can be further reduced.

[0015]

An embodiment will be described with reference to FIGS. 1 and 2 are denoted by the same reference numerals. FIG. 3 is a diagram illustrating the automatic 2 applied to the embodiment.
The V-type engine E is supported below a main frame 10 that extends in a left-right pair in the front-rear direction.

Downdraft-type carburetors 6 are attached to suction passages (not shown) formed in the respective cylinders 11 before and after the engine E, and the intake pipe 12 extends upward to integrate the carburetors 6 integrally. It is contained in the vaporized vaporizer base 6a. The carburetor base 6a communicates with an opening (see FIG. 4) formed downward in the intake chamber 13.

The intake chamber 13 is provided with the intake duct 9 of the present invention.
And the air inlets 14, 1 each opening forward.
5 above and below, and the upper intake port 14
6 is connected to an opening 17 formed on the front surface.

The lower intake port 15 has a front end suction port portion located above the radiator 18 and a rear end portion has a suction chamber 13.
To the bottom. Above the intake chamber 13, the fuel tank 1 is rotatably supported at the front lower portion by a hinge 19 with respect to the main frame 10. The rear part of the fuel tank 1 extends along the main frame 10 to the rear end.

In the figure, reference numeral 20 denotes a handlebar, 21 denotes a brake lever, 22 denotes a brake hose, 23 denotes a front fork, 24 denotes a front wheel, 25 denotes a brake caliper, and 25a.
Is a brake disc, 26 is a rear swing arm, 27
Is a rear wheel, 28 is a rear cowl, and 29 is a seat.

FIG. 4 shows the detailed structure of the fuel supply device. The fuel tank 1 has an integral structure in which a reserve tank 3 is provided above the front end portion and the other portion is a main tank 2. At the rear of the main tank 2, the fuel tank 1 is lowered to a position lower than the vaporizer 6. A pump chamber 30 is formed at the lowest part.

A fuel pump 4 is inserted into the pump chamber 30 from below, is removably fixed to the bottom of the pump chamber 30 by a base 4a, and its discharge port is connected to the fuel pipe 5. The fuel pipe 5 includes a delivery section 31 and a return section 32.

The delivery section 31 connects the discharge port of the fuel pipe 5 of the fuel pump 4 to the cock body 33 attached to the bottom of the reserve tank 3, and the return section 32 extends from the cock body 33 to the bottom of the fuel tank 1. And is externally connected to the vaporizer 6.

The cock body 33 with the regulator valve 8 integrated therein is connected to the fuel tank 1 below the reserve tank 3.
By detaching the detachable lid 1a formed at the bottom of the fuel tank 1, the fuel tank 1 is inserted and mounted from the bottom side in advance.

The regulator valve 8 is composed of a relief valve or the like, and communicates with the delivery section 31 via a cock body 33. When the fuel pressure in the delivery section 31 exceeds a predetermined pressure, the regulator valve 8 opens to partially release the fuel. It is designed to be introduced inside.

When the fuel cock 7 provided inside the cock body 33 is opened and closed, the cock body 33 is in an ON state in a normal state where the sending part 31 communicates with the return part 32, and in a preliminary state where the reserve tank 3 communicates with the cock body 33. Is switched to the REST position.

The switching operation of the fuel cock 7 can be performed at any time by rotating a knob 35 attached to the upper end of the fuel cock 7 via a rotating shaft 34 penetrating the reserve tank 3 in the vertical direction.

The knob 35 is accommodated in a concave portion 36 formed at the top of the reserve tank 3 and opening upward.

An overflow port 37 is formed in the upper part of the reserve tank 3 at the height of the limit surface of the fuel, and the fuel exceeding the limit is returned to the main tank 2.

A fuel supply port 38 for enabling quick refueling is formed at the center top surface of the fuel tank 1, and one end of a dynamic pressure passage 39 connected to the intake port 9 is connected to the fuel port 38. A one-way valve 40 is provided in the middle of the dynamic pressure passage 39 so as to apply a dynamic pressure to the fuel tank 1 side.

It should be noted that a filter 4 is provided at an intermediate portion of the sending section 31.
1 is provided, and one end of a return portion 32 protruding from the bottom of the fuel tank 1 communicates with a float chamber 6 b of the vaporizer 6 via a nipple 42.

A confirmation window 43 for checking the fuel level is provided on the upper rear surface of the main tank 2, and a pouring surface sensor 44 is provided below the confirmation window.

Reference numeral 45 in the figure denotes an upper gusset for reinforcing between the front ends of the left and right main frames 10, 46 denotes a sponge provided at a contact portion with the intake chamber 13, and 47 denotes a lower gusset.

Next, the operation of this embodiment will be described. In the normal running state in which the fuel is sufficiently present in the main tank 2 in FIG. 4, the fuel in the main tank 2 is pressure-fed to the cock main body 33 via the delivery unit 31 by the fuel pump 4.

The fuel cock 7 in the cock body 34 is
Since the position has been switched to the N position, the fuel in the delivery section 31 enters the return section 32 and is sent to the carburetor 6 at a predetermined fuel pressure.

At this time, if the fuel pressure of the delivery section 31 is equal to or higher than a predetermined pressure, the regulator valve 8 communicating with the inside of the cock body 33 opens, and a part of the fuel overflows and is stored in the reserve tank 3. Can be

Therefore, fuel can be automatically stored in the reserve tank 3 by the fuel pump 4 even during normal running. In addition, the fuel pressure supplied to the vaporizer 6 is maintained at a predetermined pressure or higher.

If the fuel pressure of the delivery section 31 does not reach the predetermined pressure, the regulator valve 8 is kept closed, so that the fuel of the delivery section 31 is maintained at the predetermined fuel pressure via the return section 32 via the carburetor. 6 without affecting the power performance.

When the fuel in the main tank 2 runs out, the knob 3
When the fuel cock 7 is turned to the REST position by turning 5, the fuel in the reserve tank 3 is supplied to the carburetor 6 through the return part 32 by natural fall.

At this time, the dynamic pressure is also applied to the inside of the reserve tank 3 through the dynamic pressure passage 39, so that the fuel can be smoothly supplied by natural fall despite the ram pressure supercharging.

[0040]

According to the present invention, since a part of the fuel pipe connecting the main tank and the carburetor and the inside of the reserve tank are connected by the regulator valve, the surplus fuel is automatically removed even during traveling. The fuel pressure on the carburetor can be kept from dropping.

Therefore, the vehicle can travel with less influence on the power performance, and a special operation of stopping the vehicle and storing fuel in the reserve tank is not required, which is extremely convenient. And when the main tank is empty,
Since the reserve tank is full of fuel, the vehicle can be immediately and reliably switched to the reserve state and run.

[Brief description of the drawings]

FIG. 1 is a diagram of a normal state showing the principle of the present invention.

FIG. 2 is a preliminary state diagram illustrating the principle of the present invention.

FIG. 3 is a side view of the motorcycle according to the embodiment.

FIG. 4 is a sectional view of a main part of the embodiment.

FIG. 5 is a front view of a main part including a lever portion of the embodiment.

FIG. 6 mainly shows a brake lever in FIG. 5;
Bottom view

[Explanation of symbols]

1: fuel tank, 2: main tank, 3: reserve tank,
4: Fuel pump 5: Fuel pipe, 6: Vaporizer, 7: Fuel cock, 8: Regulator valve

──────────────────────────────────────────────────続 き Continuation of the front page (56) References JP-A-54-36419 (JP, A) JP-A-59-158367 (JP, A) JP-A-55-148958 (JP, A) JP-A-60-1985 122265 (JP, A) JP-A-2-153253 (JP, A) JP-A-3-28922 (JP, U) JP-A-60-135287 (JP, U) (58) Fields investigated (Int. Cl. ⁷ , DB name) F02M 37/00 F02M 37/00 301

Claims (1)

(57) [Claims] 1. A carburetor to which a dynamic pressure such as a traveling wind is applied;
A fuel tank including a reserve tank located above the carburetor and a main tank located at a lower portion below the reserve tank; and a fuel pump provided at a bottom side of the main tank and for pumping fuel to the carburetor. And a fuel pipe connecting the fuel pump and the carburetor, and connecting the reserve tank and the carburetor via a fuel cock.When the fuel cock is opened, the fuel from the reserve tank to the carburetor falls naturally. In the fuel supply device, the middle part of the fuel pipe is arranged near the reserve tank, the fuel is pumped from the fuel pump toward the upper reserve tank, and the middle part of the fuel pipe is placed in the reserve tank. Connected to the provided regulator valve, when the hydraulic pressure of the fuel to be pumped is higher than a predetermined pressure, the regulator valve opens and the fuel in the fuel pipe is opened. Parts was introduced into the reserve tank and the fuel supply apparatus characterized by blocking the flow of fuel to the reserve tank is closed Regulator valve when less than the predetermined pressure.