JPH0543266Y2 - - Google Patents

Description

[Detailed description of the invention] [Field of industrial application] This invention is a fuel injection type internal combustion engine installed in a vehicle, in which pressure is connected to a fuel delivery pipe for distributing fuel to fuel injection valves for each cylinder. This invention relates to a fuel return device for guiding excess fuel released from a control valve to a fuel tank.

[Conventional technology and its problems]

Generally, in a fuel-injected internal combustion engine, fuel sent from a fuel tank by a fuel pump is distributed to fuel injection valves for each cylinder via a fuel delivery pipe. A pressure control valve is provided that maintains the fuel pressure approximately constant by releasing a portion of the excess fuel when the fuel pressure inside exceeds a certain value, and the fuel released from the pressure control valve is returned. The fact that the fuel tank is led to the fuel tank via piping is disclosed in, for example, Utility Model Application No. 57-
This is well known as described in Japanese Utility Model Application No. 193965 and Japanese Utility Model Application Publication No. 60-65372.

In this case, conventionally, the pressure control valve is provided at one end of the fuel delivery pipe, as shown in, for example, Japanese Utility Model Application Publication No. 61-59863. The fuel return piping from the pressure control valve is designed to protrude from the side of the internal combustion engine, so if this is applied to a fuel-injected internal combustion engine mounted on a vehicle, it will prevent damage in the event of a vehicle collision. , the pressure control valve and the fuel return pipe from the pressure control valve,
The problem was that there was a high risk of damage due to impact, fuel leakage, and fire, and low safety.

The present invention aims to improve the safety of a pressure control valve for a fuel delivery pipe and a fuel return pipe from the pressure control valve.

[Means for solving problems]

To achieve this objective, the present invention provides an intake manifold for an internal combustion engine with a chamber extending in the direction of the cylinder row, and an L-shaped intake manifold in side view that independently connects each intake port in each cylinder with the chamber. A vehicular internal combustion engine configured by a pipe line, and in which a fuel delivery pipe to a fuel injection valve for each cylinder is arranged substantially parallel to a cylinder row between the chamber and the internal combustion engine, A pressure control valve for the fuel delivery pipe is located between the chamber and the internal combustion engine and inward from one end of the fuel delivery pipe, and the fuel outlet of the pressure control valve is located at the other end of the fuel delivery pipe. On the other hand, a fuel return pipe from the fuel outlet of the pressure control valve is arranged so as to extend substantially parallel to the fuel delivery pipe, and then the intake air is supplied from between each of the intake pipes. The structure is such that it is led out below the manifold.

[Functions and effects of the idea]

With this configuration, both the pressure control valve for the fuel delivery pipe and the fuel return pipe from the pressure control valve are installed within the range surrounded by the chamber in the intake manifold, each intake pipe, and the internal combustion engine. In other words, since they are surrounded by the chamber and each intake pipe in the intake manifold and the internal combustion engine, the pressure control valve and fuel return pipe here are protected against damage to the intake manifold in the event of a vehicle collision. It will not be damaged unless you do so.

Therefore, according to the present invention, when a fuel injection type internal combustion engine is mounted on a vehicle, it is possible to reliably improve the safety of the fuel return device from the fuel delivery pipe.

[Embodiment] An embodiment of the present invention will be described below with reference to the drawings. In the drawing, reference numeral 2 indicates a front engine room in the vehicle body 1, and reference numeral 3 indicates a front engine room provided with four cylinders A1, A2, A3, and A4. Each internal combustion engine 3 is shown horizontally mounted in the front engine room 2 so that its crank axis 3a is substantially perpendicular to the direction of travel of the vehicle. Note that the reference numeral 2a indicates a front dash panel forming the rear surface of the front engine room 2.

Reference numeral 4 indicates an inertial supercharging type intake manifold for the internal combustion engine 3, and the intake manifold 4 is joined to the rear longitudinal side surface 3b of the internal combustion engine 3 via a flange portion 5. The intake manifold 4 includes a chamber 6 that extends in the direction of each cylinder row, and an intake pipe that is L-shaped in side view and independently connects the chamber 6 to each of the intake ports 7, 8, 9, and 10 in each cylinder. 1
A throttle body 15 having a built-in throttle valve is connected to one end of the chamber 6, and an air cleaner (not shown) is connected to the inlet side of the throttle body 15. An intake passage 16 is connected thereto.

Further, reference numeral 17 indicates each of the cylinders A1, A2, A
3. Fuel injection valve 18, 19, 20 for A4,
21 indicates a fuel delivery pipe for distributing fuel from a fuel pump (not shown), and the fuel delivery pipe 17 is located between the internal combustion engine 3 and the chamber 6 in the direction of the cylinder row. It is arranged to extend to. Note that the reference numeral 22 indicates a fuel supply pipe to the fuel delivery pipe 17.

Reference numeral 23 indicates a pressure control valve connected to the fuel delivery pipe 17, and the pressure control valve 23 is connected between the internal combustion engine 3 and the chamber 6, and one end thereof is connected to the fuel delivery pipe 17. In the part that goes inside by the appropriate size from 17a,
The fuel outlet 24 of the pressure control valve 23 is arranged to extend toward the other end of the fuel delivery pipe 17. On the other hand, a metal fuel return pipe 26 connected to the fuel outlet 24 of the pressure control valve 23 via a rubber pipe 25 is arranged so as to extend substantially parallel to the fuel delivery pipe 17. , its tip 26
a diagonally downward so that it projects below the intake manifold 4 from between the first cylinder intake pipe 11 and the second cylinder intake pipe 12 among the intake pipes 11, 12, 13, and 14. Create a curved configuration.

Note that the tip portion 26 of the fuel return pipe 26
A is connected via a rubber pipe 27 to a metal return pipe (not shown) disposed in a floor tunnel under the floor plate of the vehicle so as to reach a fuel tank at the rear of the vehicle. Further, the pressure control valve 23 is connected to the fuel delivery pipe 17, and the fuel return pipe 26 is connected to each intake pipe line 11, 12, 1.
3 and 14, respectively.

With this configuration, the fuel delivery pipe 1
7 and the pressure control valve 2
The fuel return pipe 26 connected via a rubber pipe 25 to the fuel outlet 24 at 3 is surrounded by the chamber 6 and each intake pipe 11, 12, 13, 14 in the intake manifold 4 and the internal combustion engine 3. Since the intake manifold 4 can be installed within this range, it will not be damaged in the event of a vehicle collision unless the intake manifold 4 is damaged.

[Brief explanation of the drawing]

The drawings show an embodiment of the present invention; FIG. 1 is a plan view, FIG. 2 is a front view, FIG. 3 is a side view, and FIG. 4 is an enlarged sectional view of a pressure control valve. 1...Vehicle body, 2...Front engine room,
3... Internal combustion engine, A1, A2, A3, A4... Cylinder, 4... Intake manifold, 5... Flange portion, 6... Chamber, 7, 8, 9, 10... Intake port, 11, 12, 13, 14... Intake pipe line, 15... Throttle body, 17... Fuel delivery pipe, 18, 19, 20, 21... Fuel injection valve, 23... Pressure control valve, 24... Fuel outlet, 26... Fuel return piping.

Claims (1)

[Scope of utility model registration request] An intake manifold of an internal combustion engine is constituted by a chamber extending in the direction of the cylinder row, and an intake pipe line that is L-shaped in side view and independently connects each intake port in each cylinder to the chamber, and , a vehicle internal combustion engine in which a fuel delivery pipe to a fuel injection valve for each cylinder is arranged substantially parallel to the cylinder row between the chamber and the internal combustion engine, a pressure control valve for the fuel delivery pipe; A pressure control valve disposed between the chamber and the internal combustion engine and at a portion entering the inside from one end of the fuel delivery pipe so that the fuel outlet of the pressure control valve faces the other end of the fuel delivery pipe. , characterized in that a fuel return pipe connected to the fuel outlet of the pressure control valve is arranged so as to extend substantially parallel to the fuel delivery pipe, and then led out from between each of the intake pipes below the intake manifold. A fuel return device for internal combustion engines for vehicles.