JPS6239380A - Fuel feeder for scooter type car - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a fuel supply device used in scooter-type motorcycles and tricycles.

[Prior art]

Conventionally, the fuel tank of scooter-type motorcycles is installed almost directly above the engine, and the difference in water head between the fuel tank and the carburetor is used to transfer the fuel in the fuel tank to the float chamber of the carburetor. is supplied to.

By the way, recently, the present applicant has proposed installing the fuel tank in front of the footboard for placing the feet, that is, for example, inside the leg shield, in order to secure storage space for, for example, a helmet under the seat. The application has already been completed.

According to this configuration, not only is there a large distance between the fuel tank and the engine's carburetor in the front and back, but also the bottom of the fuel tank is located below the float chamber of the carburetor. A fuel pump is installed to forcefully pump fuel toward the float chamber.

[Problem that the invention seeks to solve]

However, in the configuration of this prior art, the distance of the fuel pipe connecting the fuel pump and the float chamber is long, so for example, if the vehicle is driven until there is no fuel in the fuel supply path,
Even if fuel is supplied into the fuel tank, it takes time for the fuel discharged from the fuel pump to reach the float chamber. For this reason, it is extremely difficult to fill the float chamber with fuel in a short period of time, resulting in problems such as reduced startability.

[Means for solving problems]

Therefore, in the present invention, a space is provided between the front fork and the seat for the driver's feet, a fuel tank is placed in front of this space, and an engine is connected to the engine behind the space. Assuming that the vehicle is a scooter type vehicle in which a carburetor is arranged and the liquid level in the float chamber of the carburetor is located above the lowest fuel level in the fuel tank, the carburetor is placed at the rear of the above space. 70- A fuel pump connected to the toe chamber is arranged, and this fuel pump is installed below the lowest liquid level of fuel H in the fuel tank, and these fuel pumps and the bottom of the fuel tank are connected with a communicating pipe. It is characterized by

[Effect]

According to this configuration, when refueling the fuel tank,
In addition to the natural flow of fuel to the fuel pump,
The length of the pipe from the fuel pump to the float chamber is significantly shortened. For this reason, even if you drive until there is no fuel in the fuel supply route from the fuel tank to the float chamber, or even if there is no fuel in the fuel supply route at all like when the car was new, you can refill the fuel tank. , this fuel is immediately pressurized by the fuel pump and is filled into the float chamber within a short time.

Therefore, no time or effort is required for the fuel in the float chamber to reach an appropriate level, and good startability can be ensured.

[Embodiments of the invention]

An embodiment of the present invention will be described below based on the drawings in which the present invention is applied to a scooter type motorcycle.

Figure 2 birth number 1 shows an underbone-shaped frame,
This frame 1 is largely bent downward between a front fork 2 that supports a front wheel 2a and a rear seat 3, and a footboard 5 is installed on this bent portion 4. A leg shield 6 that rises upward is continuously provided at the front end of the footboard 5, and a wide space 7 is secured between the leg shield 6 and the seat 3 for placing the driver's feet. ing.

Further, a swing type engine unit 8 is pivotally supported at the rear end of the bending portion 4 . Engine unit 8 of this embodiment
is an integrated transmission case IO that houses a two-stroke engine 9 and a V-belt type continuously variable transmission, and is located at the rear of the space 7, and the continuously variable transmission is located at the rear end of the transmission case 10. It supports the rear wheels 11 which are driven by.

Note that the area from below the seat 3 to around the engine 9 is covered with a cover 12.

On the other hand, a fuel tank 13 is arranged inside the leg shield 6 located in front of the space 7. A cylindrical inlet 23 that is opened and closed by a tank cap 22 is formed on the top surface of the fuel tank 13, and the bottom of the fuel tank 13 is connected to a float chamber 14 of a carburetor 14 connected to the engine 9.
It protrudes below a. Therefore, as shown in FIG. 1, the fuel level L2 in the float chamber 4a is
is located above the lowest fuel level L1 in the fuel tank 13. And these fuel tanks 13
and the float chamber 14a are in communication with each other, and the piping structure for this communication will be described below.

That is, a fuel pump 15 is arranged at the rear of the space 7, and this fuel pump 15 is located close to the engine 9 and at a position lower than the minimum liquid level L1. The discharge port of the fuel pump 15 is the supply pipe 1
6 to the float chamber 14a of the carburetor 14, and the inlet is connected to a fuel outlet 18 on the bottom of the fuel tank 13 via a communication pipe 17.
is inserted substantially horizontally below the footboard 5, that is, at a position lower than the lowest liquid level L1 along the front-rear direction.

Although the fuel pump 15 of this embodiment uses a pulse pump whose driving source is the pulsating pressure in the crank chamber of the engine 9, other electromagnetic pumps may be used.

Further, the supply pipe 1G and the upper part of the fuel tank I3 are communicated through a fuel return pipe 20. Fuel return pipe 20
After branching from the supply pipe 1B, it passes below the footboard 5 in the same way as the communication pipe 17, that is, it passes forward through a position lower than the lowest liquid level L1 of the fuel tank 13, and this front end It is raised in front of the footboat 5 and connected to the upper part of the fuel tank 13 located at a position higher than the liquid level L2 of the float chamber 14a by a head difference H2. Therefore, the fuel return pipe 20 is approximately U-shaped, and its connection port to the fuel tank 13 is approximately at the same height as the open end of the injection port 23.

Note that fuel filters 21 are provided at the fuel outlet 18 of the fuel tank 13 and the downstream end of the fuel return pipe 20, respectively.

According to one embodiment of such a configuration, the footrest space 7
Since the fuel pump 15 is arranged behind the engine 9, the fuel pump 15 and the carburetor 14 are close to each other, and the length of the supply pipe 16 connecting the two can be shortened. Moreover, since the fuel pump 15 is located at a position lower than the lowest liquid level L1 of the fuel tank 13, the fuel pump 15
If you refuel pump 3, this fuel will naturally flow to fuel pump 1.
It will go up to 5.

For example, the flow from the fuel tank 13 (chamber 1
Even if the vehicle is driven until there is no fuel in the fuel supply route (4a) or there is no fuel at all in the fuel supply route (as when the car is new), refueling from the filler port 23 of the fuel tank 13 , this fuel is immediately pressurized by the fuel pump 15 and reaches the float chamber 14a within a short time.
is filled with.

Therefore, it does not take time or effort for the fuel in the float chamber 4a to reach the appropriate liquid level L2, which has the advantage of maintaining good startability.

Note that the vehicle according to the present invention is not limited to a motorcycle, but may also be a tricycle having two rear wheels.

〔Effect of the invention〕

According to the present invention described in detail above, the fuel level in the float chamber reaches the appropriate level within a short time, so that no effort or time is required for fuel supply, and good startability is ensured. can do.

[Brief explanation of drawings]

The drawings show one embodiment of the present invention, and FIG. 1 is a schematic diagram of a fuel supply route, and FIG. 2 is a partially cutaway side view of a scooter type motorcycle. 2...Front fork, 3...Seat, 7...
Space, 9...Engine, 13...Fuel tank, 14
... Carburizer, 14a... Float chamber, 15... Fuel pump, 17... Communication pipe. Applicant's agent Patent attorney Takehiko Suzue Figure 1

Claims (1)

[Claims] A space for the driver's feet is provided between the front fork and the seat, a fuel tank is placed in front of this space, and an engine is connected to the engine behind the space. In a scooter type vehicle in which a carburetor is arranged and the liquid level in the float chamber of the carburetor is located above the lowest liquid level of the fuel in the fuel tank, the float chamber of the carburetor is located at the rear of the above space. A scooter type vehicle characterized in that a fuel pump connected to the fuel tank is disposed below the lowest liquid level of the fuel tank, and the fuel pump and the bottom of the fuel tank are connected by a communicating pipe. Fuel supply device.