JP2553444Y2 - Fuel delivery pipe - Google Patents

Description

[Detailed description of the invention]

[0001]

BACKGROUND OF THE INVENTION The present invention is to supply fuel supplied from a fuel pressurizing pump of a fuel injection type automobile engine to each intake passage or each cylinder of the engine through a fuel injector (injection nozzle). In particular, the present invention relates to a connection structure between a communication pipe having a fuel passage and a socket for mounting a fuel injection valve.

[0002]

2. Description of the Related Art A conventional fuel delivery pipe has a plurality of cylindrical sockets for receiving an injection shaft of a fuel injection valve, as shown in, for example, Japanese Utility Model Laid-Open No. 59577/1984. The pipes are connected so as to communicate with each other internally by a communication pipe having a cross section, and are disposed at predetermined intervals in a predetermined direction. Cylindrical sockets include a type that is welded to the communication pipe and a type that is integrally formed with the communication pipe. In the case of the welding type, the socket is formed of a cylindrical body having a smooth inner peripheral surface, and its outer end side Is formed so as to be expanded in a tapered shape to facilitate connection with the fuel injection valve.

[0003] In the type in which the socket is welded to the metal communication pipe, the manufacturing of the socket itself requires man-hours and time for performing complicated and precise processing. In order to obtain high dimensional accuracy after the brazing process, a 100% inspection process by matching the molds is required, resulting in an increase in cost. In addition, it has been pointed out that the metal communication pipe generates resonance sound based on a so-called speaker effect due to the vibration of the engine, generating abnormal noise and causing discomfort and anxiety to the user. It has also been pointed out that the metal fuel delivery pipe absorbs the heat of the engine from its surroundings and becomes hot, and the fuel flowing inside may generate vapor.

In the type in which the socket is formed integrally with the communication pipe, the entire fuel delivery pipe is made of aluminum die-cast or extruded aluminum as disclosed in, for example, Japanese Utility Model Application Laid-Open No. 59-107050, "Delivery Pipe Apparatus". However, since the surface treatment is performed after molding the whole, the surface treatment is likely to be non-uniform, and because the mold for drafting requires a draft angle, the wall thickness increases and the weight increases,
There are drawbacks in that it is difficult to find defects such as internal nests, and that quality cannot be guaranteed, and that it is difficult to deal with design changes.

In Japanese Utility Model Laid-Open No. 60-14276, "fuel distribution pipe for internal combustion engine", the entire fuel delivery pipe is formed of a composite material in which a reinforcing fiber material is mixed with a synthetic resin, but the heat resistance is insufficient. There are drawbacks such as the fact that the whole is bent or distorted due to expansion and contraction due to heat and deformed, and that the synthetic resin swells and deteriorates when the fuel passes through the inside.

[0006]

SUMMARY OF THE INVENTION An object of the present invention is to provide a resin delivery pipe made of a resin which can suppress expansion and contraction due to heat while keeping the advantage of the resin and can maintain sufficient rigidity. It is in. Another purpose of the present invention is
An object of the present invention is to reduce the loudspeaker effect of the fuel delivery pipe to prevent the generation of abnormal noise. It is still another object of the present invention to suppress the fuel delivery pipe from being heated by external heat to a high temperature, and to prevent the generation of vapor in the fuel.

[0007]

SUMMARY OF THE INVENTION The above-mentioned object of the present invention is to provide a rectangular metal flat plate with a predetermined interval between both side edges.
To form a semicircular notch at symmetrical positions.
A metal plate is wound around a cylinder, press-formed, and
Gold formed into a tube by joining along the mating line
Metal pipe, and cover the entire top surface of this
A resin coating that extends in the direction of
For mounting the fuel injection valve at the position corresponding to the position of the notch
Cylindrical sockets are arranged, and the coating is molded
This is achieved by a fuel delivery pipe which is tightly coated on the surface of the communication pipe .

According to this configuration, since the metal communication pipe is inserted into the fuel delivery pipe, the overall rigidity is maintained, and the resin covering the communication pipe is prevented from being thermally deformed and has the original shape. , And thermal deformation during manufacturing and during use can be prevented. Since the entire upper surface of the metal communication pipe is covered with resin,
The heat insulating effect against the heat from the outside is ensured, the fuel flowing inside is prevented from becoming high temperature, and the effect of preventing the generation of vapor is obtained. The metal communication tube is a rectangular flat plate
Since it is molded by press molding from
Eliminates the difficult drilling work of drilling a hole in the center,
No burrs inside the communication pipe, reducing costs
And quality improvement is achieved.

The resin coating is formed at a relatively low temperature as compared with the high temperature at the time of welding, so that thermal deformation during manufacturing is prevented, dimensional accuracy is maintained, and connection with the fuel injector is facilitated. Is obtained. In addition, since the resin coating acts as a damper for preventing the metal communication pipe from generating resonance, the speaker effect of the fuel delivery pipe can be reduced and generation of abnormal noise can be prevented. .

[0010] The resin-made cover is formed by molding so as to be tightly covered on the communication pipe . In a preferred embodiment, the resin coating can be applied tightly over the front and back surfaces of the communication tube. Also,
It is desirable that the resin-made cover and the metal-made communication pipe be tightly fixed via an uneven portion provided with a projection or a bent portion on one or both of them. In addition, it is preferable that various sealing members are interposed at the connection portion between the socket and the communication pipe to enhance the sealing performance. This is particularly effective in preventing a gap from being formed between the communication pipe and the socket when there is a large difference in the coefficient of thermal expansion between them. Other features and advantages of the present invention will become apparent from the following description made with reference to the accompanying drawings.

[0011]

FIG. 1 shows an entire fuel delivery pipe 10 according to a preferred embodiment of the present invention. The entire upper surface of a communication pipe assembly 11 integrally formed of metal is covered with a synthetic resin coating. 21 is tightly covered. The cladding 21 extends in the longitudinal direction along the communication pipe assembly 11, and has three cylindrical socket portions 22 for mounting the fuel injection valve at predetermined intervals in the longitudinal direction. The fuel delivery pipe 10 shown in the figure is used in a six-cylinder V-type engine in combination with one pair. Therefore, three socket portions 22 are provided. Four portions 22 will be provided.

The communication pipe assembly 11 before being covered with the coating 21 has a structure as shown in FIG. 4. One end of the communication pipe assembly 11 is provided with a high-pressure fuel supplied from a fuel pump and a pressure regulating valve. A flange 13 for introducing the fuel is connected to the other end, and a connecting pipe 14 for sending surplus fuel to another cylinder or a fuel tank is connected to the other end side. It is attached to the pipe member 12. Further, a thick solid bracket 15 for attaching the fuel delivery pipe 10 to the engine is fixed to the pipe member 12 by welding or brazing.

FIGS. 2 and 3 are sectional views showing the connection structure between the communication pipe assembly 11 and the cover 21 which is the subject of the present invention. As shown in FIG. 2, the coating 21 is tightly coated on the pipe member 12 of the communication pipe assembly 11, and the inside of the socket portion 22 is formed through a hole 18 formed in the wall surface of the pipe member 12. Fuel passage 1 inside the pipe member
It communicates with 7.

In FIG. 3, fuel supplied to the inside of the flange 13 is supplied to the fuel supply passage 1 inside the pipe member 12.
7 and forward through the hole 18 in the wall, through the interior of the socket portion 22 and out to the fuel injector. On the other hand, surplus fuel is supplied from the fuel supply passage 17 to the connecting pipe 1.
4 to another cylinder or fuel tank.

The covering 21 having the socket portion 22
After the communication pipe assembly 11 is formed into the structure shown in FIG. 4, it is set in a molding machine and molded integrally with synthetic resin. This molding is advantageously performed after welding the flange 13, the connecting pipe 14, and the bracket 15 on the pipe member 12 and performing a surface treatment.
According to this method, it is possible to prevent contamination of the surface and a reduction in corrosion resistance that occur when welding or brazing is performed after the surface treatment.

As shown in FIG. 3, a strip-shaped projection 2 continuous in the circumferential direction is provided near an end face of the pipe member 12 on the flange side.
8 are formed, and the projections 28 cooperate with protrusions 30 formed when the cover 21 is molded so that the cover 21 does not move on the pipe member 12 in the axial direction of the communication pipe. It works to fix. Further, the covering 21
Preferably, an adhesive or other sealing member 31 is attached between the flange-side end surface of the first member and the flange 13 to prevent fuel from leaking. Further, the end face 19 of the pipe member 12 on the connection pipe 14 side is bent inward to make a structure in which the connection pipe 14 is inserted therein.
The end face 26 of the cover 21 covers this portion. A sealing member 32 is also attached to this portion,
It is desirable to prevent fuel leakage.

The pipe member 12 shown in FIG. 4 can be formed into a tubular shape by winding a rectangular metal flat plate 40 as shown in FIG. 5 around a cylinder and press-forming. If the semicircular notches 18A and 18B are provided symmetrically on both side edges at the stage of the flat plate 40, these notches cooperate in the state of being rolled into a tube, and along the joining line 35. A hole 18 as shown in FIG. 4 is formed.

FIG. 6 is a vertical sectional view of a fuel delivery pipe 60 according to another embodiment of the present invention, in which a pipe member 62 of a communication pipe assembly 61 integrally formed of metal.
The cover 65 made of a synthetic resin closely covers the front surface and the back surface. The covering body 65 extends in the longitudinal direction above and below the pipe member 62 along the communication pipe assembly 61, and has a cylindrical socket portion 22 for mounting the fuel injection valve at a predetermined interval in the longitudinal direction. Are provided. Such a resin coating body 65 is formed by a technique of inserting a mandrel into the inside of the pipe member 62, injecting the resin from the resin injection hole to the inner surface (back surface) of the communication tube, and molding.

When the pipe member 62 shown in FIG. 6 is formed, the metal flat plate shown in FIG. 5 is modified into a metal flat plate 70 as shown in FIG. 7, and a semicircular notch 18A,
In addition to 18B, holes 72 for resin injection are provided at required intervals. The hole 72 also functions as an uneven portion for fixing the cover 65 and the pipe member 62 to each other.

A metal flat plate 80 shown in FIG. 8 is a modification of the metal flat plate shown in FIG. Hole 72 can also be arranged.

[0021]

As described in detail above, according to the present invention, the rigidity of the whole is maintained by the insertion of the metal communication pipe, and the resin covering the communication pipe is prevented from being thermally deformed. Will be maintained. The metal communication pipe is
At least the entire top surface is covered with resin,
The heat insulation effect against the heat from the outside is ensured, the fuel flowing inside is suppressed from becoming high temperature, and the generation of vapor is prevented. Since the resin coating is formed at a relatively low temperature as compared with the high temperature at the time of welding, dimensional accuracy is maintained without causing thermal deformation, and connection with the fuel injector is facilitated. Further, since the resin coating acts as a damper for preventing the metal communication pipe from generating resonance, the speaker effect of the fuel delivery pipe can be reduced and generation of abnormal noise can be prevented. .

The metal communication pipe is pressed from a rectangular flat plate.
Since it is formed by molding, a hole is formed in the center of the cylindrical member.
Eliminating the difficult drilling work of opening
There is no burr in the part. Since the plurality of sockets are molded at the same time, the work of adjusting the interval and angle when attaching the plurality of sockets to the communication pipe as in the related art is not required, and the assembly and inspection processes are significantly simplified. If molding is performed after the welding operation, it is possible to prevent contamination of the surface and a decrease in corrosion resistance. In this way, a fuel delivery pipe having sufficient rigidity and dimensional accuracy is obtained, and the practical value thereof is remarkable, such as improvement in quality and reduction in cost.

[Brief description of the drawings]

FIG. 1 is a perspective view showing an entire fuel delivery pipe according to the present invention.

FIG. 2 is a cross-sectional view of the socket portion taken along a direction crossing the communication pipe.

FIG. 3 is a longitudinal sectional view of the fuel delivery pipe cut along an axial direction of the communication pipe.

FIG. 4 is a perspective view showing a communication pipe assembly made of metal.

FIG. 5 is a plan view of a plate-shaped material for forming a pipe member.

FIG. 6 is a longitudinal sectional view of a fuel delivery pipe according to another embodiment of the present invention.

FIG. 7 is a plan view of a plate-shaped material for forming the pipe member of the embodiment of FIG. 6;

FIG. 8 is a plan view illustrating a modification of the plate-like material in FIG.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 10 Fuel delivery pipe 11 Communication pipe assembly 12 Pipe member 17 Fuel supply passage 18 Hole 21 Resin coating 22 Socket part 28, 30 Uneven part

Claims (2)

(57) [Scope of request for utility model registration] 1. A rectangular metal flat plate is provided with predetermined edges on both side edges.
Form semicircular notches at symmetrical positions at intervals
Then, wrap this metal flat plate around the cylinder and press
Formed and formed into a tube by joining along the joint line
And a resin covering body extending in the longitudinal direction so as to cover the entire upper surface of the communicating pipe, wherein the covering body has a fuel at a position corresponding to the position of the notch. A cylindrical socket for mounting a fuel injection valve is arranged ,
Is in close contact with the surface of the communication pipe by molding.
A fuel delivery pipe characterized by being coated . 2. A predetermined portion is provided at the center of a rectangular metal flat plate.
Forming circular cutouts at intervals and said cutouts
A hole for resin injection is formed around the
Wrapped around the tube and press-formed, along the joint line
Metal communication tube formed into a tubular shape by joining
And extends in the longitudinal direction so as to cover the entire upper surface of the communication pipe.
A cover made of resin, wherein the cover has a fuel at a position corresponding to the position of the notch.
A cylindrical socket for mounting a fuel injection valve is arranged,
Is formed on the front and back surfaces of the communication pipe by molding.
A fuel delivery pipe characterized by being tightly covered .