JPH0237162A - Fuel supplying device for engine - Google Patents

Abstract

PURPOSE:To make it possible to rapidly and unfailingly start and engine by installing a release valve in the release piping which connects an starter and a fuel pump, which valve is adapted to release fuels to be introduced into the fuel pump when pressure inside the starter exceeds a predetermined value. CONSTITUTION:A starter 20 comprises the closed-structure type main body 21 of its container, to the exhaust side bottom portion of which is connected piping 33 at one end thereof through an outlet valve 22 and the other end of the piping 33 is connected to a cabureter 25. Release piping 32 interconnects the main body 21 of the container of the starter 20 and the diaphragm room 14 of the fuel pump 11. The release piping 32 has a release valve 37 installed therein which is open while pressure inside the main body 21 of the container is more than a predetermined value, for releasing fuels retained in the main body 21 of the container to introduce the fuels into the diaphragm room 14. The fuels retained in the main body 21 of the container of the starter 20 can thus be supplied to the cabureter 25 in a short time and under a predetermined pressure during start of the engine.

Description

DETAILED DESCRIPTION OF THE INVENTION [Object of the Invention] The present invention relates to an engine fuel supply system, and more particularly to an engine fuel supply system that can start an engine quickly and reliably.

(Prior Art) FIG. 3 shows a general outboard motor 40. As shown in FIG. 3, the outboard motor 40 includes a drive shaft section 42 provided on a hull 49 so as to be steerable, an engine section 43 provided above the drive shaft section 42, and a drive shaft section 42.
The gear part 44 is provided at the lower part of the propeller 2 and supports a propeller 45 rotatably in the horizontal direction.

The drive shaft section 42 is provided on the hull 49 via a mounting bracket 48 having a vertical shaft 48a, and the drive shaft section 42 is attached to a rudder rod 47 provided on the engine section 43.
It is designed to be steered by.

Next, a fuel supply device for the engine disposed within the engine section 43 will be explained.

The fuel supply device includes a fuel pump connected to the fuel tank via a squeeze pump, a starter and a carburetor connected in parallel to the fuel pump, and the necessary air-fuel mixture is supplied from the carburetor to the engine. It has become so.

Among these, the starter temporarily stores the fuel sent from the fuel pump and supplies the fuel to the carburetor when starting the engine.

Of the fuel supply devices described above, the fuel tank is disposed inside the hull, but the fuel pump, starter, and carburetor are disposed within the engine section 43. Generally, the starter is placed above the carburetor, and fuel is supplied from the starter to the carburetor by its own weight.

A conventional starter will be explained with reference to FIG.

As shown in FIG. 2, the starter 50 has a main body 5 that is open to the atmosphere.
1, the container body 51 is provided with a large mouth valve 53 through which fuel flows from the fuel pump, and an outlet valve 55 through which fuel flows out to the carburetor.

Further, a float 52 is disposed within the container body 51, and the inlet valve 53 is opened and closed by this float 52.

In such a conventional fuel supply device, the squeeze pump operates first, and the fuel in the fuel tank is supplied from the fuel pump to the starter and the carburetor. starter 50
The fuel sent to the starter 50 is temporarily stored in the container body 51 of the starter 50. The fuel in the container body 51 is controlled to a constant amount by opening and closing an inlet valve 53 using a float 52.

Next, when the engine is started, the outlet valve 55 is opened.
Fuel in the container body 51 of the starter 50 is supplied to the carburetor via the outlet valve 55. Thereafter, the necessary air-fuel mixture is supplied from the carburetor to the engine, and the engine starts operating.

(Problems to be Solved by the Invention) As described above, in the conventional fuel supply device, the fuel in the container body 51 of the starter 50 is supplied to the carburetor when the engine is started.

However, since the container body 51 is open/closed to the atmosphere, the fuel in the container body 51 of the starter 50 is supplied to the carburetor by its own weight.

Therefore, there is a problem in that fuel cannot be supplied to the carburetor in a short time when starting the engine, and the engine cannot be started quickly and reliably. Furthermore, since the starter 50 must be placed above the carburetor, there is a problem in that the placement position of the starter 50 is restricted. Furthermore, although a float 52 is disposed inside the container body 51 of the starter 50, the oil level of the fuel fluctuates due to vibrations, etc.
The float 52 moves up and down, opening the large mouth valve 53, and excessive fuel may flow into the container body 51.

The present invention has been made in consideration of these points,
An object of the present invention is to provide an engine fuel supply device that can quickly and reliably start an engine.

[Structure of the invention]

(Means for Solving the Problems) The present invention includes a fuel pump connected to a fuel tank, a starter and a carburetor connected in parallel to the discharge side of the fuel pump, and a gap between the starter and the carburetor. A fuel supply system for an engine, in which the starter is connected through an outlet valve provided on the discharge side of the starter, the starter has a sealed structure, and the starter and the fuel pump are connected by a relief pipe. In addition, the present invention is characterized in that a relief valve is attached to the relief pipe to release the fuel in the starter to the fuel pump when the pressure in the starter reaches a predetermined pressure or higher.

(Function) When the pressure inside the starter exceeds a specified level, the fuel inside the starter is released to the fuel pump via the relief valve, so the pressure inside the starter can be kept constant, and when the engine is started, the fuel inside the starter is released to the fuel pump. Fuel can be supplied to the carburetor under pressure.

(Example) Hereinafter, an example of the present invention will be described with reference to the drawings.

FIG. 1 is a diagram showing an embodiment of an engine fuel supply system according to the present invention.

In FIG. 1, the fuel supply device 10 is a fuel tank.

The fuel pump 11 is connected to the fuel pump 19 via a squeeze pump 27, the starters 20 and 1 are connected to the fuel pump 11 via a pipe 31, and the carburetor 25 is connected to the fuel pump 11 via a pipe 35. We are prepared. Of these fuel supply devices 10, the fuel tank 19 is disposed inside the hull 49, but the fuel pump 11, starter 20, and carburetor 25 are all connected to the engine section 43 of the outboard motor 40 (
(Fig. 3).

The fuel pump 11 also includes a suction chamber 13 that communicates with a fuel tank 19 via a squeeze pump 27, a discharge chamber 15 that communicates with a starter 20 and a carburetor 25, and a suction chamber 13 that communicates with a fuel tank 19 via a squeeze pump 27.
3 and the discharge chamber 15, and these suction chambers 13
and a diaphragm chamber 14 communicating with a discharge chamber 15.

Further, a check valve 17 is provided between the suction chamber 13 and the diaphragm chamber 14 to allow inflow only to the diaphragm chamber 14 side, and a check valve 17 is provided between the diaphragm chamber 14 and the discharge chamber 15 to allow inflow only to the discharge chamber 15 side. A check valve 18 is provided that allows only inflow. Furthermore, a diaphragm 16 is provided within the diaphragm chamber 14. This diaphragm 16 is operated by fluctuations in vacuum pressure P from a suction port 14a communicating with an engine (not shown), and the operation of this diaphragm 16 causes the fuel sucked from the suction chamber 13 to , is supplied from the diaphragm chamber 14 to the starter 20 and carburetor 25 via the discharge chamber 15.

Note that the discharge chamber 15 and the starter 20 are connected independently (in parallel) by a pipe 31, and the discharge chamber 15 and the carburetor 25 are connected by a pipe 35, respectively.

Further, the starter 20 is composed of a container body 21 of a closed structure type, and one end of a pipe 33 is connected to the bottom discharge side of the container body 21 via an outlet valve 22. Furthermore, this piping 3
The other end of 3 is connected to a carburetor 25.

Further, the outlet valve 22 of the starter 20 is a needle valve, and is opened and closed by a solenoid 23.

Further, the container body 21 of the starter 20 and the diaphragm chamber 14 of the fuel pump 11 are connected by a relief pipe 32. Furthermore, the starter 20 is connected to the relief pipe 32.
When the internal pressure of the container body 21 exceeds a predetermined pressure, the valve is opened and the fuel in the container body 21 is transferred to the diaphragm chamber 14.
A relief valve 37 is installed to release the air.

Next, the operation of this embodiment having such a configuration will be explained.

First, the squeeze pump 27 is operated manually, and the fuel in the fuel tank 19 is supplied to the starter 20 and the carburetor 25 via the fuel pump 11.

The fuel supplied to the starter 20 is temporarily stored within the container body 21 of the starter 20. When the pressure of the fuel in the container body 21 exceeds a predetermined pressure, the relief valve 37 releases the fuel to the diaphragm chamber 14 of the fuel pump 11, so that the fuel pressure in the container body 21 is kept constant.

Next, when starting the engine, the outlet valve 22 is opened by the solenoid 23, and the fuel in the container body 21 of the starter 20 passes through the outlet valve 22 and piping 33 to the carburetor 2.
5. The fuel supplied to the capretor 25 is
It is vaporized in the carburetor 25 and supplied to the engine.

In the fuel pump 11, when the engine starts,
The vacuum pressure P from the suction port 14a communicating with the engine changes, and the diaphragm 16 operates. By the operation of this diaphragm 16, the fuel tank 1
9, fuel is sucked into the suction chamber 13 via the squeeze pump 27.

The fuel sucked into the suction chamber 13 is then supplied to the starter 20 and the carburetor 25 via the diaphragm chamber 16 and the discharge chamber 15.

The fuel supplied to the starter 20 is stored for the next engine start.

According to this embodiment, the fuel in the container body 21 of the starter 20 is supplied to the carburetor 25 under a predetermined pressure, so that the carburetor 25 can be heated to the carburetor 25 in a short time when the engine is started.
can be supplied to

Therefore, the engine can be started quickly and reliably. Also, the container body 21 of the starter 20 is connected to the carburetor 2.
Since it is not necessary to arrange the starter 20 above the starter 20, the arrangement position of the starter 20 can be freely selected. Furthermore, since there is no need to provide a float within the container body 21 of the starter 20, the internal structure of the starter 20 can be simplified and manufacturing costs can be reduced. Furthermore, since no float is provided, even if the fuel oil level fluctuates, fuel will not flow excessively into the container body of the starter 20.

〔Effect of the invention〕

As described above, according to the present invention, fuel can be supplied under pressure from the starter to the carburetor when starting the engine, so that the engine can be started quickly and reliably. Furthermore, since it is not necessary to arrange the starter above the carburetor, the arrangement position of the starter can be freely selected. Furthermore, there is no need to provide a float within the starter, and the internal structure of the starter can be simplified and manufacturing costs can be reduced.

[Brief explanation of the drawing]

FIG. 1 is a schematic system diagram showing an embodiment of an engine fuel supply system according to the present invention, FIG. 2 is a side sectional view showing a starter of a conventional engine fuel supply system, and FIG. FIG. 3 is a side view showing the outboard motor. 10...Fuel supply device, 11...Fuel pump, 19
... Fuel tank, 20 ... Starter, 22 ... Outlet valve, 25 ... Carburetor, 32 ... Relief pipe, 3
7...Relief valve. Applicant's agent Sato - Rooster 1 Figure 3

Claims (1)

[Claims] A fuel pump connected to a fuel tank, a starter and a carburetor connected in parallel to a discharge side of the fuel pump, and an outlet valve provided on a discharge side of the starter between the starter and the carburetor. In the fuel supply system for an engine, the starter has a sealed structure, and the starter and the fuel pump are connected by a relief pipe, and the pressure inside the starter is connected to the relief pipe at a predetermined pressure or higher. 1. A fuel supply device for an engine, characterized in that a relief valve is installed to release the fuel in the starter to the fuel pump when the fuel is in the starter.