JPH09170516A - Delivery pipe of fuel supply device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To eliminate idling instability, restartability failure of an internal combustion engine, etc., by gradually feeding fuel from a fuel injection valve to the internal combustion engine without mixing bubbles generated in a fuel distributing pipe to lead fuel to a fuel injection device with fuel. SOLUTION: This delivery pipe has a cylindrical main body 10 one end surface of which is closed and to the other end of which a conduit pipe is connected, at least one side surface and a lower surface of the cylindrical main body 10 are doubly structured by an internal wall 13 and an external wall 14, an opening part 15 is provided on an upper end of the internal wall 13 of a side part, a plural number of holes are provided along the longitudinal direction on the external wall 14 of the lower surface of the cylindrical main body 10, and one end part 17 of a injection cup 12 is inserted inthis hole. Consequently, a channel of fuel passing through a clearance 16 between the internal wall 13 and the external wall 14 from the opening part 15 to the injection cup 12 is formed.

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 for a fuel injection type internal combustion engine in a four-wheeled vehicle, a two-wheeled vehicle, and the like. More specifically, the present invention relates to a structure of a delivery pipe which is a fuel distribution pipe for supplying fuel to a fuel injection nozzle.

[0002]

2. Description of the Related Art In a conventional fuel injection type internal combustion engine,
A fuel distribution pipe is disposed near the internal combustion engine. For this reason, when the temperature of the internal combustion engine becomes high after high-speed running and the like, and the fuel distribution pipe and the fuel therein are heated, steam or air may be mixed and air bubbles may be generated in the fuel distribution pipe.
Usually, as a countermeasure, a shield plate is provided between the fuel distribution pipe and the internal combustion engine, or the fuel distribution pipe is covered with a shielding material to suppress the temperature rise of the fuel in the fuel distribution pipe.

[0003]

However, the above conventional fuel supply device has the following problems. (1) During idling after high-speed running, air bubbles generated in the fuel distribution pipe are mixed with fuel and sent from the fuel injection nozzle to the internal combustion engine. Therefore, the fuel injection amount is temporarily reduced and idling becomes unstable. (2) Further, when the vehicle is restarted after being stopped, the bubbles generated in the fuel distribution pipe are sent to the internal combustion engine while being mixed with the fuel, so that the restartability of the internal combustion engine is extremely poor.

SUMMARY OF THE INVENTION In view of the above problems, the present invention gradually injects fuel into an internal combustion engine without mixing air bubbles generated in a fuel distribution pipe for guiding the fuel to a fuel injection device, thereby suppressing idling instability and the internal combustion engine. It is an object of the present invention to provide a delivery pipe of a fuel supply device in which a restartability failure or the like does not occur.

[0005]

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned object, and has as its gist a cylindrical main body having one end face closed and a conduit connected to the other end. And
At least one side surface and the lower surface of the tubular main body have a double structure with an inner wall and an outer wall, and an opening is provided at an upper end of an inner wall of a side portion. A hole is provided, and one end of the injection cup is inserted into the hole, thereby forming a flow path of the fuel that passes through the gap between the inner wall and the outer wall from the opening and passes through the injection cup. To provide a delivery pipe for a fuel supply device.

[0006]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, a delivery pipe of a fuel supply device according to the present invention will be described in detail with reference to the drawings. FIG. 1 is a longitudinal sectional view showing an example of a fuel injection type internal combustion engine provided with a delivery pipe of a fuel supply device according to the present invention. In this figure, 1 is a cylinder block,
The cylinder block 1 has a cylinder bore 2 and a piston 3. The piston 3 reciprocates in the cylinder bore 2. The upper part of the cylinder bore 2 is closed by a cylinder head 4. A spark plug 5 is installed diagonally above the cylinder head 4, and an intake valve 6 is installed above it. The intake valve 6 is driven by a valve operating device provided in the cylinder head cover 7.

An intake manifold 8 is laterally connected to the cylinder head 4, and a fuel injection nozzle 9 is provided in the intake manifold 8.
The fuel injection nozzle 9 is provided with the delivery pipe 10 of the present invention.
Is connected. FIG. 2 is a side view of the delivery pipe 10, and FIG. 3 is a bottom view thereof. The main body of the delivery pipe 10 is a cylindrical body, one end face of which is closed, and the other end of which is connected to a conduit 11. A plurality of holes are provided in the lower portion of the main body of the delivery pipe 10, and the injection cup 12 is installed in the holes. This injection cup 12 is connected to the fuel injection nozzle 9.

Next, the internal structure of the delivery pipe 10 will be described with reference to FIG. 4 which is an enlarged sectional view taken along the line IV-IV of FIG. The main body of the delivery pipe 10 is a cylindrical body having a square cross section, and one side surface and the lower surface are formed of an inner wall 13.
And the outer wall 14. An opening 15 is provided in an upper part of the inner wall 13. A relatively narrow gap 16 is formed between the inner wall 13 and the outer wall 14, which is sufficient as a fuel flow path. On the other hand, there is a hole on the lower surface side of the outer wall 14, and one end 17 of the injection cup 12 is connected to this hole. The fuel enters the main body of the delivery pipe 10 from the conduit 11, passes through the opening 15, passes through the gap 16 provided between the inner wall 13 and the outer wall 14,
After passing through the injection cup 12, the fuel is sent to the fuel injection nozzle 9 and the internal combustion engine.

Normally, when the internal combustion engine generates heat by running the vehicle, the fuel in the delivery pipe 10 is heated, and steam and air are mixed. When the vehicle is stopped in this state, the steam and the air become bubbles, and float on the upper portion in the delivery pipe 10. Thereafter, when the vehicle is restarted, first, air bubbles pass from the opening 15 through the gap 16,
Sent to the internal combustion engine. Even if bubbles remain,
Since the flow path of the fuel in the delivery pipe 10 is the small gap 16 between the inner wall 13 and the outer wall 14, a large amount of air bubbles are not sent to the internal combustion engine at one time.

Another Embodiment (1) Next, another embodiment of the present invention will be described. FIG. 5 is a side view showing another embodiment of the delivery pipe. One end of the delivery pipe 10 is closed, and the other end of the delivery pipe 10 is closed.
Is connected. An injection cup 12 is provided on a side surface of the delivery pipe 10.
FIG. 6 is an enlarged sectional view taken along line VI-VI in FIG. In this figure, the bottom surface of the main body of the delivery pipe 10 forms a concave portion 18 inward. A hole 19 is provided in the recess 18, and the injection cup 1 is provided in the hole 19.
2 has one end 17 inserted.

As a result, the injection cup 12 passes from the recess 18 of the main body of the delivery pipe 10 through the opening provided at the end 17 of the injection cup 12.
Form a flow path for the fuel to escape. In addition, bubbles generated in the delivery pipe 10 are collected above the inside of the delivery pipe 10, and are injected from the recess into the injection cup 1.
Sent to 2. (2) The shape of the main body of the delivery pipe 10 is not limited to a cylindrical body having a square cross section, but may be a cylindrical shape.

[0012]

As described above, according to the delivery pipe of the present invention, (1) when idling after high-speed running, the delivery pipe and the fuel therein are heated, so that bubbles are generated. This air bubble rises above the delivery pipe,
Since the fuel is gradually fed from the fuel injection nozzle to the internal combustion engine through the gap between the inner wall and the outer wall from the opening, idling does not temporarily become unstable. (2) Also, when the vehicle is stopped and then restarted, similarly, bubbles generated in the delivery pipe are first sent to the internal combustion engine and do not mix with fuel. For this reason, the restartability of the internal combustion engine is improved.

[Brief description of the drawings]

FIG. 1 is a longitudinal sectional view showing an internal combustion engine and a fuel supply device according to the present invention.

FIG. 2 is a side view showing a delivery pipe according to the present invention.

FIG. 3 is a bottom view showing a delivery pipe according to the present invention.

4 is an enlarged cross-sectional view taken along the line IV-IV of FIG.

FIG. 5 is a side view showing a delivery pipe according to another embodiment.

FIG. 6 is an enlarged sectional view taken along line VI-VI in FIG. 5;

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Cylinder block 2 Cylinder bore 3 Piston 4 Cylinder head 5 Spark plug 6 Intake valve 7 Cylinder head cover 8 Intake manifold 9 Fuel injection nozzle 10 Delivery pipe 11 Conduit 12 Injection cup 13 Inner wall 14 Outer wall 15 Opening 16 Gap 17 End part 18 Depression 19 Hole

Claims (2)

[Claims] 1. A tubular body having one end face closed and a conduit connected to the other end, wherein at least one side face and lower face of the tubular body have a double structure of an inner wall and an outer wall, An opening is provided at an upper end of an inner wall of the cylindrical body, and a plurality of holes are provided along a longitudinal direction in an outer wall of a lower surface of the cylindrical body, and one end of an injection cup is inserted into the hole, whereby the opening is formed. A fuel flow passage which passes through a gap between the inner wall and the outer wall from the portion to form a fuel flow passage through the injection cup. 2. A concave portion is provided on a bottom surface of a cylindrical body having one end face closed and a conduit connected to the other end, inwardly on a side portion of the cylindrical body, and the concave portion is formed along the longitudinal direction. A plurality of holes were made, and one end of the injection cup was inserted into the holes, thereby forming a fuel flow path from the cylindrical body through the concave portion in the cylindrical body and leaking to the injection cup. A delivery pipe for a fuel supply device.