JPH0458059A - Pipe line system in injector housing - Google Patents

Abstract

PURPOSE:To effectively and suitably attain the purpose of cooling and the purpose of fuel supply so as to increase the freedom of designing by arranging a plurality of parallel pipe lines from a pipe line to a plurality of injector housings so as to feed fuel individually into the injector housings. CONSTITUTION:Fuel press-fed into a fuel feed pipe 4 from a fuel tank by means of a pump is divided into branch streams having a number corresponding to the number of engine cylinders, by a distributing pipe 5 connected to a fuel feed pipe line. The distributing pipe 5 is connected in parallel to the inlet ports of the injector housings 7a through 7d by way of distribution lead pipes 6a through 6d formed of flexible tubes having a relative small diameter, and accordingly, fuel is fed to the injector housings 7a through 7d, individually. Fuel filled in each of the injector housings 7a through 7d cools each of side-forward type injectors 17a through 17d in the housings, and is fed into each of the housings by way of a fuel introduction port in which a filter is fitted, and is injected into an intake manifold in a cylinder head section.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to a piping system for a fuel system of an automobile or the like, and particularly to a piping system for an injector housing installed for each cylinder.

Conventional technology In the fuel system of automobiles, fuel is pumped up from the fuel tank and sent to the fuel supply pipeline under pressure, and after the pulsation of the fuel is alleviated by a damper, it is filtered by a filter and sent to the injector installed in each cylinder. When the injector opens, the fuel is injected into the intake manifold in the form of a mist. Excess fuel is then returned to the fuel tank via a pressure regulator and a return vibe. In the side feed type injector, each injector is inserted into an injector housing installed for each cylinder, and the fuel is supplied to the injector housing, and the fuel filling the housing is taken in from the side of the injector. The fuel filling the housing also cools the injector.

The conventional injector housings 2a, 2b.

As shown in Figure N7, 2C and 2d are integrally connected in series at the cylinder pitch via a relatively thick connecting vibrator 1 with a diameter of about 15 mm to form a series-mounted injector housing unit. A plurality of units with different numbers are prepared and attached to the intake manifold 3 unit by unit. For this reason, the injector housing unit has a bracket 1a for unit mounting on the connecting vibe 1.
are pre-brazed. The series-connected injector housing unit described above is the injector housing 2.
a, 2b... are connected through the connecting vibrator 1, and the fuel supplied from one end sequentially flows from the front to the rear injector housing through each connecting vibrator, and passes through the pressure regulator 4 to the tank as described above. be returned.

Problems to be Solved by the Invention However, in the conventional example described above, since a plurality of injector housings are connected in series and the oil is passed through the structure, the fuel gradually warms up in the nose until it reaches the injector housing at the end, and the main part of the injector housing heats up. This has the problem of impairing the cooling effect, which is one of the purposes, and creating a fuel pressure difference between the inlet and outlet of the unit.

In addition, when the series-mounted injector unit is assembled, a thick connecting pipe is installed horizontally across the cylinder head, creating a considerable amount of dead space and restricting the arrangement of other wiring, piping, and parts. Reduces the degree of freedom in space design. In addition, parts must be replaced on a unit-by-unit basis, which is uneconomical, and also increases weight and price, which goes against the demands for weight reduction and cost reduction, which are priorities in the vehicle industry. .

The present invention provides an injector housing piping system that solves the problems of the prior art described above.

Means for Solving the Problems The injector housing piping system of the present invention connects parallel piping from a pipeline that supplies fuel pressure-fed from the fuel tank side to each injector housing installed for each cylinder, and connects each injector housing individually to each injector housing. It is configured to supply fuel.

Function: The fuel pumped to the fuel supply pipeline as described above is distributed in parallel to each of the injector housings through a distribution lead vibrator made of a flexible tube or the like, and the fuel in the housing is supplied to the injectors while performing a cooling effect.

As a result of the above, fuel is supplied to each injector housing at a uniform fuel pressure and a uniform temperature, thereby effectively achieving the purpose of fuel supply and cooling. In addition, each injector housing is not limited to other housings and is individually attached to the intake manifold, so there is no need for pitch accuracy like in the series-mounted type, which makes manufacturing and setting extremely easy, and has the advantage that the housings can be replaced individually. be.

In addition, the load caused by the external [1] is reduced, and damage to the vibrator connection portion can be effectively prevented.

Since it is not unitized via a large-diameter vibrator as in the serially connected type, the weight is reduced compared to the same serially connected type, and costs can be reduced.

Example Embodiments of the present invention are shown in FIGS. 1 to 6.

The first embodiment (see figure 's1) The fuel that is pressure-fed from the fuel tank to the fuel supply vibe 4 via the pump is divided into a number of parts according to the number of air spaces by the distribution pipe 5 connected to the fuel supply pipeline. For example, diameter 5
- Form distribution lead vibros a to 6d made of flexible tubes (relatively thin (about 2)), and connect in parallel between the inlets of the distribution pipe 5 and the injector housings 7a to 7d via the distribution lead vibros a to 6d. to individually supply fuel to each injector housing 7a to 7d, and cool each of the side feed type injectors 17a to 17d inside the housing with the fuel filling each housing. Fuel in the housing is introduced from the inlet 17' and injected into the intake manifold of the cylinder head. Excess fuel is collected from the outlet side of each injector housing through recovery lead vibes 8a to 8 made of flexible tubes.
d, and are connected to a return vibe 11 leading to the fuel tank via a pressure regulator 10 and a vibe 12 to the intake manifold, and the pressure inside the manifold is detected at the end of the vibe 12. Note that the recovery pipe 9 used is the same as the distribution pipe S described above.

Second Embodiment (See Figure 2) Fuel from the fuel supply vibrator 4 is divided in parallel by a distribution pipe 5, and is individually distributed to injector housings 7a to 7d via distribution lead vibros a to 6d made of thin flexible tubes. The fuel is fed under pressure to cool the injectors 17a to 17d in each housing, and at the same time, fuel is introduced from the side of the injector.

As shown in FIG. 5, the injector housings 7a to 7d are of a type in which only an inlet side connection port 16a formed of a short pipe is projected, and the fuel injected by the injector is replenished. A pressure regulator 10 for pressure regulation is directly connected to a dedicated outlet of the distribution pipe 5, and via the pressure regulator is connected to a return vibe 11 leading to the fuel tank and a vibe 12 leading to the intake manifold.

Injector housings 7a to 7 of each embodiment described above
d is shown in FIGS. 4 to 6, and FIG. The inlet side connection port 15a and the outlet side connection port 15b are provided in parallel and protrude in the same direction at positions offset from the center of the housing 7 and the injectors 17a to 17d, preferably injectors 17a to 17a. The outer peripheral surface and the housings 7a to 7d
are arranged in parallel and protrude in the tangential direction of the annular space formed between the inner circumferential surfaces of the annular space. As a result, the fuel introduced under pressure from the artificial side connection port 15a circulates in a substantially U-shape through the annular space and smoothly flows out to the outlet side connection port 15a.

This housing is used in the circuit of the first embodiment in which the pressure regulator 10 is provided on the outlet side of the injector housing. FIG. 5 shows injector housings 7a to 7d used in the circuit of the second embodiment in which the pressure regulator 10 is provided on the injector inlet side, and the housing has only the inlet side connection port lea.

Each of the injector housings 7a to 7d has a bulge 7' on one side wall, the front side surface of the bulge 7' is substantially flat, and the connection ports +5a, 15b, 16 are formed on the front side surface.
An example in which a is provided protrudingly is shown.

The injector housings 7a to 7d as described above are made by placing a cylindrical material in a mold, filling the cylindrical material with an elastic body such as liquid or rubber, and applying pressure to the cylindrical material to generate internal pressure. It is molded by a so-called bulge processing method in which the bulging portion 7° is bulged. A bracket 18 is provided on the injector housing in a protruding manner for attaching and fixing it to the intake manifold. The injector is inserted into the axis of the injector housings 7a to 7d, the housing is hermetically sealed, and the nozzle at the tip of the injector protrudes from the opening at the lower end of the housing. At this time, the bulging portion 7' is installed at a position facing the fuel inlet 17° on the side surface of the injector.

FIG. 3 is an embodiment of a pressure regulator unit with a distribution pipe for supplying fuel to an injector. Fuel is supplied to the injector through the housing of the pressure regulator, which is operated by the differential pressure between the fuel supply vibe or recovery lead vibe and the intake manifold. It has a structure in which distribution pipes are directly connected to each other. In the same figure, part 5 is the distribution pipe,
The part 10 indicates the pressure regulator, and the distribution pipe 5
has a plurality of distribution ports 5b juxtaposed in the same direction from the side surface of the main tube portion 5a, and the distribution lead vibros a to 6d are connected to the distribution ports 5b.

Further, a connection port 5c forming an inlet to which the fuel supply vibrator 4 is connected is protruded from one end of the distribution pipe 5, and the housing of the pressure regulator 10 is directly connected to the other end.

The above unit is shown in Figures 1 and 2 in Figures 1 and 2. It can be used in the second embodiment, in which case the fuel flow is shown by the white arrow A, and if the above unit is used on the outlet side of the injector housing in the first embodiment in Fig. 1, a recovery pipe 9 is included. This becomes the pressure regulator 10, 5C becomes the fuel outlet side, 5a becomes the recovery port for fuel from the injector, and the recovery pipes 88 to 8d are connected. The flow of fuel in this case is shown by the black arrow B, 10a is the diaphragm chamber of the pressure regulator 10, tob
10d is a diaphragm, 10d is an external pilot port to which a pipe leading to the intake manifold is connected and used for pressure detection, and 10e is a return port to which a return pipe to the fuel tank is connected.

The return port 10e and the external pilot port 10d have a diaphragm 10b between them, projecting in opposite directions, and the inlet end of the return port 10e is arranged close to each other and facing each other so that the opening degree can be adjusted by the valve seat portion 10c at the center of the diaphragm. .

Effects of the Invention According to the present invention, fuel having uniform temperature, pressure, etc. can be individually supplied to each injector housing in parallel, and the purpose of cooling and fuel supply by the injector housing can be achieved in a consistent and effective manner. In addition, since the injector housings are not connected in series through thick pipes, dead space near the injector installation area is eliminated, the space above the cylinder head can be used effectively, and the degree of freedom in design is expanded.

Furthermore, the impact applied to each injector housing by the internal combustion engine is significantly reduced, and damage to pipe connections etc. due to vibration can be prevented.

Another advantage is that the injector housing can be replaced independently. Furthermore, the pitch dimension Ff1 degree between the injectors is not required as in a series-connected injector housing unit, and manufacturing and setting to the intake manifold are extremely easy. In addition, the weight is significantly reduced compared to the above-mentioned series connection type, and cost reduction can be achieved. Overall, it is effective for use in piping systems for injector housings in vehicle fuel system circuits.

4 PiiJIL explanation of the drawings Fig. 1 is a system diagram showing the first embodiment of the injector housing piping system of the present invention, Fig. 2 is the same system diagram showing the second embodiment of the present invention, and Fig. 3 is a system diagram showing the above-mentioned each. FIG. 4 is an enlarged sectional view illustrating the pressure regulator unit with distribution pipe used in the embodiment, FIG. 4 is a perspective view illustrating the injector housing with the fuel port and outlet used in the first embodiment, and FIG. A perspective view of an injector housing with only a fuel inlet used in the second embodiment, FIG. 6 is an enlarged longitudinal sectional view of the injector housing, and FIG. 7 is a systematic diagram of a conventional injector piping system and a series connection used in the system. FIG. 3 is a cross-sectional view of the twin injector housing unit.

5... Distribution pipe, 6a to 6d... Distribution lead pipe, 7a to 7d... Injector housing, 8a to 8d... Recovery lead pipe, 9... Recovery pipe, 10
...Pressure regulator, 17a to 17d
−・・Injector.

Figure 3 Figure 4 Figure 5

Claims (1)

[Claims] The fuel pump is characterized in that a pipeline that supplies fuel pressure-fed from the fuel tank side is connected in parallel to a plurality of injector housings installed for each cylinder, so that fuel can be supplied to each injector housing individually. Injector housing piping system.