JPH0642423A - Fuel supply device - Google Patents

Abstract

PURPOSE:To store fuel in a reserve tank while maintaining specified fuel pressure during run. CONSTITUTION:A fuel tank 1 is constituted of a main tank 2 and a reserve tank 3, and a fuel pump 4 provided on the main tank 2 is connected to a carburator 6 by a fuel pipe 5. The reserve tank 3 is positioned in a space above the carburator 6, and connected thereto via a fuel cock 7. A regulator valve 8 installed inside the reserve tank 3 is connected to the fuel pipe 5. Fuel is pressure-fed to the carburator 6 under specified fuel pressure by the fuel pump 4 via the fuel pipe 5 in the case of a normal condition, and simultaneosly a regulator valve 8 is opened when the fuel pressure increases beyond its specified level and partial fuel is led inside the reserve tank 3 so that fuel may be automatically stored therein.

Description

Detailed Description of the Invention

[0001]

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

[0002]

2. Description of the Related Art Such things are known, for example,
Japanese Utility Model Laid-Open No. 60-135287 and Japanese Patent Laid-Open No. 60-12.
There is one described in Japanese Patent No. 2265. Each of these is equipped with a main tank whose bottom surface is lower than that of the carburetor, a reserve tank arranged above the carburetor, and a fuel pump which pumps fuel from the main tank to the carburetor.

In the former case, the fuel pump continuously pumps oil into the reserve tank under normal conditions (when there is fuel in the main tank), and then spontaneously drops the oil into the carburetor. On the other hand, in the latter, the fuel pump oil passage is branched into two and connected to a carburetor and a reserve tank so that fuel is always stored in the reserve tank. It is shown that the oil is selectively sent to the reserve tank.

[0004]

By the way, in the case of the above-mentioned Kaikai Sho, it is difficult to obtain a sufficient fuel supply pressure (hereinafter, referred to as fuel pressure) because the carburetor is refueled by a natural drop even in a normal time. It becomes easily affected by dynamic pressure such as traveling wind.

Further, in the above-mentioned Japanese Patent Laid-Open Publication No. Sho, in the case of a type in which a part of the fuel to be pumped is constantly supplied to a reserve tank, the fuel pressure is apt to decrease even if a polygonal angle fuel pump is used.

Further, in the method of selectively sending oil, fuel cannot be stored in the reserve tank during traveling, and special operation such as purposely stopping the vehicle to supply 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 the carburetor 6 via the fuel pipe 5. The fuel pipe 5 passes through the vicinity of the reserve tank 3 which is connected above the carburetor 6 via the fuel cock 7.

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 becomes equal to or higher than 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.

Dynamic pressure such as traveling wind is applied to the carburetor 6 from the intake duct 9 (this state is hereinafter referred to as ram pressure supercharging). Further, a part of this 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 that connects 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 the connecting portion between the fuel pipe 5 and the regulator valve 8.

[0012]

1 shows a normal state in which a sufficient amount of fuel is present in the main tank 2, and fuel is pumped from the fuel pump 4 to the carburetor 6 through the 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 equal to or higher than a predetermined pressure, the fuel pipe 5 is automatically opened and a part of the fuel flows from the fuel pipe 5. Is introduced into the reserve tank 3 to store fuel.

At this time, if the fuel pressure in the fuel pipe 5 does not reach the 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). The fuel cock 7 is opened and the reserve tank 3 is opened.
The fuel stored therein is supplied to the carburetor 6 by spontaneous 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]

EXAMPLE One example will be described with reference to FIGS. It should be noted that common reference numerals are used for portions common to the portions in FIGS. 1 and 2. FIG. 3 shows the automatic 2 applied to the embodiment.
A V-type engine E is supported below a main frame 10 that shows an external side view of a wheeled vehicle and extends in a left-right pair in the front-rear direction.

A downdraft type carburetor 6 is attached to an intake passage (not shown) formed in each of the front and rear cylinders 11 of the engine E, and an intake pipe 12 thereof extends upward to integrate the carburetor 6 into one body. It is inside the vaporized carburetor 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 the intake duct 9 of the present invention.
Is an example of the intake ports 14 and 1 that open to the front, respectively.
5 is provided on the upper and lower sides, and the intake port 14 on the upper side is the front cowl 1
6 is connected to an opening 17 formed in the front surface.

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

In the drawing, reference numeral 20 is a handle, 21 is a brake lever, 22 is a brake hose, 23 is a front fork, 24 is a front wheel, 25 is a brake caliper, 25a is a brake disc, 26 is a rear swing arm, and 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 inside of the front end and the other part is a main tank 2. The fuel tank 1 is located at the rear of the main tank 2 to a position lower than the carburetor 6. The pump chamber 30 is formed at the lowest part.

The fuel pump 4 is inserted into the pump chamber 30 from below and is detachably fixed to the bottom of the pump chamber 30 by the base portion 4a, and its discharge port is connected to the fuel pipe 5. The fuel pipe 5 comprises 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 and the cock body 33 attached to the bottom of the reserve tank 3, and the return section 32 penetrates from the cock body 33 to the bottom of the fuel tank 1. Then, the carburetor 6 is externally connected.

The cock body 33, in which the regulator valve 8 is integrated, is the fuel tank 1 below the reserve tank 3.
By detaching the detachable lid 1a formed on the bottom of the fuel tank 1, the fuel tank 1 is previously inserted and attached from the bottom side.

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

The cock body 33 is opened and closed with the fuel cock 7 provided therein, and is in an ON position in a normal state where the delivery section 31 and the return section 32 communicate with each other, and a reserve state where the reserve tank 3 and the cock body 33 communicate with each other. 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 reserve tank 3 via a rotary shaft 34 that penetrates the reserve tank 3 in the vertical direction.

The knob 35 is housed in a recess 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 fuel limit surface, and the fuel exceeding the limit is recirculated into the main tank 2.

A fuel supply port 38 for enabling rapid fuel supply is formed on the central top surface of the fuel tank 1, and one end of a dynamic pressure passage 39 connected to the intake air intake port 9 is connected. A one-way valve 40 is provided in the middle of the dynamic pressure passage 39 to apply dynamic pressure to the fuel tank 1 side.

The filter 4 is provided in the middle of the sending section 31.
1 is provided, and one end of the return portion 32 protruding from the bottom of the fuel tank 1 communicates with the float chamber 6 b of the carburetor 6 via the 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 gazing sensor 44 is provided below the inside of the confirmation window 43.

In the figure, reference numeral 45 is an upper gusset that reinforces the front end portions of the left and right main frames 10, 46 is a sponge provided at the contact portion with the intake chamber 13, and 47 is a lower gusset.

FIG. 5 shows the front appearance of the upper portion of the handle 20 and the front fork 23, and FIG. 6 shows the lever 21.
The plan view shape of the (brake side) is shown.

As shown in these figures, the brake master cylinder 50 is attached by bolts 50a so that the axis C (FIG. 6) of the fix cylinder is substantially radial to the axis of the handle pipe 51.

A base portion 53 of the brake lever 21 is rotatably attached to a protruding portion 52 formed at the line end portion of the brake master cylinder 50. The base portion 53 can be separated from the tip end side of the lever 21 by a connecting portion 54 provided in the middle.

C at the front end of the brake master cylinder 50
Adjusting shaft 5 for lever 21 for braking in the extension direction of
5 Projects forward. Normally, a knob 55a indicated by an imaginary line is provided at the line end of the adjusting shaft 55, but in the present embodiment, one end of the flexible wire 56 is attached instead, and a remote knob 57 is provided at the other end. ing.

The remote knob 57 is the left and right front forks 2.
3 is rotated to the opposite side through the front side of the clutch 3 and is supported in the vicinity of the clutch master cylinder 58 provided in the mounting portion of the clutch lever 21.

In FIG. 5, reference numeral 59 is a reserve tank for braking, 60 is a top bridge, 61 is a bottom bridge, and 62 is a head pipe. Further, reference numeral 6 in FIG.
3 is an air bleeder.

Since the remote knob 57 is provided in this manner, it can be operated near the lever 21, which is extremely convenient especially for operation during traveling.

That is, if only the adjustment shaft 55 and the adjustment knob 55a, which are originally installed in the brake master cylinder 50, this protrudes forward, the front cowl 16
This is because it is difficult to operate while traveling because it is located in the vicinity.

Since the flexible wire 56 is used, the place for supporting the remote knob 57 is not limited to this example, and any place can be selected.

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

The fuel cock 7 in the cock body 33 is previously turned off.
Since it has been switched to the N position, the fuel in the delivery section 31 enters the return section 32 and is delivered to the carburetor 6 at a predetermined fuel pressure.

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

Therefore, fuel can be automatically stored in the reserve tank 3 by the fuel pump 4 even during normal traveling. Moreover, the fuel pressure supplied to the carburetor 6 is maintained at or above a predetermined pressure.

If the fuel pressure of the delivery portion 31 does not reach the predetermined pressure, the regulator valve 8 remains closed, so that the fuel of the delivery portion 31 keeps the predetermined fuel pressure and is returned to the carburetor via the return portion 32. 6 and is not affected in power performance.

When the fuel in the main tank 2 is exhausted, 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 via the return portion 32 by spontaneous fall.

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

[0049]

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 excess fuel is automatically reserved even during traveling. It can be stored inside, and at that time, the fuel pressure to the carburetor can be prevented from being lowered.

Therefore, it is very convenient because the vehicle can be run with the influence on the power performance being reduced, and the special work of storing the fuel in the reserve tank by stopping the vehicle is unnecessary. And if the main tank is empty,
Since the reserve tank is filled with fuel, it is possible to immediately and surely switch to the reserve state for traveling.

[Brief description of drawings]

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

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

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

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

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

FIG. 6 is a bottom view mainly showing the brake lever in FIG.

[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

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[Procedure amendment]

[Submission date] August 4, 1992

[Procedure Amendment 1]

[Document name to be corrected] Drawing

[Name of item to be corrected] Figure 4

[Correction method] Change

[Correction content]

[Figure 4]

Claims (1)

[Claims] 1. A carburetor to which dynamic pressure such as traveling wind is applied,
A fuel tank having a reserve tank located above the carburetor and a main tank whose lowest part is located below the reserve tank, and a fuel pump provided on the bottom side of the main tank to pump fuel to the carburetor. , A fuel pipe connecting the fuel pump and the carburetor is provided, and the reserve tank and the carburetor are connected via a fuel cock, and when the fuel cock is opened, the fuel naturally drops from the reserve tank to the carburetor. In the fuel supply device configured to supply the fuel, the middle part of the fuel pipe is arranged in the vicinity of the reserve tank, the fuel is pumped from the fuel pump to the upper reserve tank, and the middle part of the fuel pipe is placed in the reserve tank. Connected with the provided regulator valve, the regulator valve opens when the hydraulic pressure of the fuel to be pumped is higher than a predetermined pressure, and the fuel in the fuel pipe 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.