JP2003214292A - Fuel supply piping - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To prevent deformation in welding means even if strength of a injection valve holder is set up low. <P>SOLUTION: An eccentric cut hole 2A is provided by cutting a part of a pipe body 2 at an eccentric position from axis line O1-O1 of the pipe body 2, in the state where a fuel injection holder 3 separately formed is fitted in the eccentric cut hole 2A, by performing welding means between the eccentric cut hole 2A and an outer peripheral surface of a large diameter cylindrical part 3A, the injection valve holder 3 is attached tightly to the eccentric position to the pipe body 2. Since welding in the injection valve holder 3 is only performed to a part of the large diameter cylindrical part 3A fitted in the eccentric cut hole 2A of the pipe body 2, the injection valve holder is prevented from deforming by suppressing welding strain. <P>COPYRIGHT: (C)2003,JPO

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a fuel supply pipe suitable for supplying fuel to an internal combustion engine such as an automobile.

[0002]

2. Description of the Related Art Generally, a fuel supply device for supplying fuel to an internal combustion engine of an automobile or the like is provided with a pump incorporated in a fuel tank, a fuel supply pipe extending from the pump to the internal combustion engine, and a fuel supply pipe connected to the fuel supply pipe. It is generally configured by a fuel injection valve or the like that injects the supplied fuel into the internal combustion engine.

The fuel supply pipe includes a pipe through which fuel flows, a stepped cylindrical injection valve holder which is mounted in communication with the pipe and accommodates a fuel injection valve therein, and the injection valve holder. A fuel supply pipe is attached to the opening side and is fixed in the injection valve holder so as to prevent the fuel injection valve from being pulled out. A fuel supply pipe of this type is disclosed, for example, in Japanese Unexamined Patent Publication No. 4-252859 and Japanese Unexamined Patent Publication No. It is known from Japanese Patent No. 242635.

The fuel supply pipe according to the first prior art disclosed in Japanese Patent Laid-Open No. 4-252859 is provided with a holder insertion hole penetrating circularly in a tube body having a rectangular cross section or an oval shape. With the injection valve holder inserted in the hole, the injection valve holder is integrally fixed to the pipe body by brazing or welding over the entire circumference between the insertion hole and the holder.

Further, in the second conventional fuel supply pipe disclosed in Japanese Patent Laid-Open No. 9-242635, the end portion of the pipe body is fixed by welding so that the axis line is orthogonal to the outer peripheral surface of the injection valve holder. By similarly welding the pipes on the opposite side, the pipes and the injection valve holder are integrally fixed.

[0006]

By the way, in the above-mentioned first prior art, brazing or welding is performed over the entire circumference between the holder insertion hole and the injection valve holder. Also,
In the second conventional technique, the pipe body is welded at two locations facing each other in the circumferential direction. As a result, the injection valve holders according to the first and second prior arts have a problem that welding distortion occurs and is deformed because welding is performed on the entire circumference or at a plurality of locations.

When the injection valve holder is deformed and the roundness is lowered in this way, the sealing property of the O-ring or the like provided between the injection valve holder and the fuel injection valve varies. Therefore, the injection valve holder has to have a high-strength structure having a sufficient thickness by forging or cutting, which causes a problem that the manufacturing cost of the injection valve holder increases.

The present invention has been made in view of the above-mentioned problems of the prior art, and an object of the present invention is to prevent deformation when welding means is applied even when the strength of the injection valve holder is set low. It is to provide a fuel supply pipe.

[0009]

In order to solve the above-mentioned problems, in the fuel supply pipe according to the invention of claim 1, a part of the pipe for supplying fuel to the internal combustion engine is eccentric from the axis of the pipe. An eccentric cutout hole is formed by notching at a position, an injection valve holder for housing a fuel injection valve is formed separately from the pipe body, and the injection valve holder is fixed to the eccentric cutout hole of the pipe body by welding means. It is configured.

With this structure, the injection valve holder is welded only to a part fitted in the eccentric cutout hole of the pipe body, so that welding distortion is suppressed and the injection valve holder is deformed. Therefore, the injection valve holder can be set to have low strength against deformation such as welding distortion.

In the fuel supply pipe according to the second aspect of the present invention, an eccentric cutout hole is formed by cutting out a part of the pipe for supplying fuel to the internal combustion engine at a position eccentric from the axis of the pipe, An injection valve holder for accommodating a fuel injection valve is formed separately from the pipe body, the injection valve holder is fixed to an eccentric cutout hole of the pipe body by welding means, and the fuel injection valve is inserted into the injection valve holder from its insertion opening. Is fitted and a lid for fixing the fuel injection valve in the retaining state is attached to the insertion opening side of the injection valve holder.

With this construction, the injection valve holder is welded only to a part fitted in the eccentric cutout hole of the pipe body, so that welding distortion is suppressed and the injection valve holder is deformed. Therefore, the injection valve holder can be set to have low strength against deformation such as welding distortion. Further, the lid body can fix the fuel injection valve in the injection valve holder so as not to be pulled out.

According to the third aspect of the invention, since the injection valve holder is formed by press working, the injection valve holder can be manufactured at low cost.

According to the fourth aspect of the present invention, the lid is detachably attached to the injection valve holder by hooking one side to the injection valve holder and screwing the other side to the injection valve holder.

With this structure, the lid body is
The fuel injection valve can be attached to and removed from the injection valve holder by simply attaching and detaching the individual screws, and the fuel injection valve can be easily attached to and detached from the injection valve holder.

[0016]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A fuel supply pipe according to an embodiment of the present invention will be described in detail below with reference to FIGS.

Reference numeral 1 denotes a fuel supply pipe mounted on an engine (not shown) of an automobile. The fuel supply pipe 1 supplies a plurality of fuel injection valves 11 which will be described later with fuel supplied from a fuel tank (not shown). Is to be supplied to. As shown in FIGS. 1 and 2, the fuel supply pipe 1 is generally composed of a pipe body 2, an injection valve holder 3, a lid body 4 and the like, which will be described later.
In this embodiment, in order to supply fuel to two cylinders on one side of a two-cylinder engine, a V-type four-cylinder engine, or a horizontally opposed four-cylinder engine, two injection valve holders 3 are provided in the pipe body 2. There is.

Reference numeral 2 is a pipe body of the fuel supply pipe 1, and the pipe body 2
Is formed as a long pipe, and is attached to the engine side, for example. A supply side pipe 15 described later is connected to the upstream side of the pipe body 2, and a return side pipe 16 is connected to the downstream side.
Are connected.

Further, in the tube body 2, a plurality of, for example, two eccentric cutout holes 2A, 2 are provided at intervals in the longitudinal direction at intervals.
A is provided (only one is shown in FIGS. 5 and 6).
Here, the eccentric cutout hole 2A is formed by cutting out a part of the pipe body 2 at a position eccentric from the axis O1-O1 of the pipe body 2, and the shape thereof is a large diameter cylinder of the injection valve holder 3 described later. The part 3A has an arc shape to be fitted. That is, the eccentric cutout hole 2A is eccentric with a dimension substantially the same as the eccentric dimension e of the axis O2-O2 of the injection valve holder 3 with respect to the axis O1-O1 of the tube body 2. The fuel flow hole 3F of the injection valve holder 3 is housed in the eccentric cutout hole 2A.

Reference numerals 3 and 3 denote two injection valve holders mounted in communication with the pipe body 2. Each of the injection valve holders 3 accommodates a fuel injection valve 11, which will be described later, inside the pipe body 2. Separately, it is formed into a stepped cylindrical shape by deep drawing using press working. Further, the injection valve holder 3 is shown in FIGS.
As shown in FIG. 3, a large-diameter cylindrical large-diameter cylindrical portion 3A, a small-diameter cylindrical small-diameter cylindrical portion 3B formed by reducing the diameter of the lower side of the large-diameter cylindrical portion 3A, and the large-diameter cylindrical portion. A flange portion 3C formed by expanding the upper opening of 3A, a one-side overhanging portion 3D radially protruding from the flange portion 3C, and the one-side overhanging portion 3D.
The other side protruding portion 3E that protrudes in the radial direction from the flange portion 3C on the opposite side is generally configured.

Further, the large-diameter cylindrical portion 3A is provided with an injection valve holder 3
Two fuel flow holes 3F, 3F are formed at positions offset to one side from the axis O2-O2, and the injection valve holder 3 communicates with the pipe body 2 through each fuel flow hole 3F. On the other hand, a hooking hole 3G is formed on the tip side of the one side overhang 3D, and a screw hole 3H is formed on the tip side of the other side overhang 3E. Further, the overhanging portions 3D and 3E are provided with lightening holes 3J and 3J so that the overhanging width of the flange portion 3C is constant.
3K is formed, so that the deformation of the injection valve holder 3 due to welding or heat of the engine can be suppressed. The upper side of the large-diameter cylindrical portion 3A is an insertion opening 3L when the fuel injection valve 11 is inserted into the injection valve holder 3.

When the injection valve holder 3 is attached to the pipe body 2, as shown in FIG. 5, the fuel flow hole 3F is aligned with the eccentric cutout hole 2A side, and the large diameter cylindrical portion 3A is attached to the eccentric cutout hole 2A.
To fit. In this state, as shown in FIGS. 1 and 4, welding is performed over the entire circumference at the joint between the outer peripheral surface of the large-diameter cylindrical portion 3A and the eccentric cutout hole 2A (tube body 2). As a result, in the injection valve holder 3, the axis O2-O2 thereof is the axis O1-O1 of the tube body 2.
Therefore, it can be fixed at an eccentric position with an eccentric dimension e.

At this time, since the injection valve holder 3 is welded only to a part of the large-diameter cylindrical portion 3A fitted in the eccentric cutout hole 2A of the tubular body 2, it is formed thin by deep drawing. Even with the injection valve holder 3 having a low strength, it is possible to suppress welding distortion and prevent deformation.

Reference numeral 4 is a lid body detachably attached to the opening side of the injection valve holder 3, and the lid body 4 is shown in FIGS.
As shown in FIG. 5, a fuel injection valve 11 which will be described later and is fitted in the injection valve holder 3 is fixed in a retaining state, and is formed into a ring shape by drawing using press working.
Here, the lid 4 is the connector portion 11D of the fuel injection valve 11.
In order to avoid this, one side of the injection valve pressing portion 4A is formed as a keyhole-shaped ring body, and a latching portion that protrudes radially from one side of the injection valve pressing portion 4A and has a tip bent in a crank shape. 4B and an overhanging portion 4C that projects radially from the injection valve holding portion 4A on the side opposite to the latching portion 4B, and a screw insertion hole 4D is formed on the tip side of the overhanging portion 4C.

The lid 4 is provided with a hook 4B on one side.
Is engaged with the locking hole 3G of the injection valve holder 3, the screw insertion hole 4D on the other side is aligned with the screw hole 3H of the injection valve holder 3, and in this state, the set screw 5 inserted into the screw insertion hole 4D is screwed into the screw hole. Screw on 3H. As a result, the lid 4 is inserted into the injection valve holder 3 and the molded portion 1 of the fuel injection valve 11 is fitted.
1C can be pressed from the upper side by the injection valve pressing portion 4A and fixed in a retaining state.

Next, 11 is a fuel injection valve accommodated in each injection valve holder 3, and the fuel injection valve 11 injects a predetermined amount of fuel to the engine in response to a control signal. As shown in FIG. 3, the fuel injection valve 11 has a large diameter portion 11A formed in a large diameter stepped column shape and a small diameter portion 11B provided on the tip side (lower side) of the large diameter portion 11A. And a disk-shaped mold portion 11 provided on the base end side of the large diameter portion 11A.
A valve body (not shown) that opens and closes the fuel injection port is provided in the small diameter portion 11B, and an electromagnetic coil that drives the valve body in the large diameter portion 11A. (Not shown).

The mold portion 11C is provided with a protruding connector portion 11D to which a connector (not shown) for supplying a drive current (control signal) to the electromagnetic coil is connected. Further, O is provided on the outer peripheral side of the small diameter portion 11B.
A ring 12 is attached, and an O-ring 13 is attached to the outer circumference of the large diameter portion 11A on the base end side.

Here, the fuel injection valve 11 has an insertion opening 3L.
The small diameter portion 11B on the tip side is inserted into the small diameter cylindrical portion 3B of the injection valve holder 3 and the large diameter portion 11A is inserted into the large diameter cylindrical portion 3A by inserting the large diameter portion 11A into the small diameter cylindrical portion 3B. Also,
By attaching the lid body 4 to the injection valve holder 3, the mold portion 11C is pressed by the lid body 4 and fixed in a retaining state. In this state, a fuel distribution space 14 (illustrated in FIG. 3) is defined between the fuel injection valve 11 and the injection valve holder 3 by the O-rings 12 and 13.

The fuel injection valve 11 injects the fuel in the fuel distribution space 14 into the intake manifold, the combustion chamber (not shown) of the engine, etc. by opening and closing the valve body according to the control signal. is there.

Further, 15 is a supply side pipe connected to the upstream side of the pipe body 2, and 16 is a return side pipe connected to the downstream side of the pipe body 2 (both are indicated by a chain double-dashed line in FIGS. 1 and 2). In the drawing, the supply side pipe 15 and the return side pipe 16 constitute a full return type fuel supply system that circulates the fuel in the fuel tank with the engine.

The fuel supply system according to the present embodiment has the above-mentioned structure, and its operation will be described below.

First, the fuel in the fuel tank is supplied to the supply side pipe 1.
5 to be supplied to the fuel supply pipe 1. A part of the fuel supplied to the fuel supply pipe 1 flows into the fuel distribution space 14 in the injection valve holder 3 from the pipe body 2, and the fuel injection valve 1
1 is injected toward the engine. Further, the surplus fuel is returned to the inside of the fuel tank via the return side pipe 16.

Thus, according to the present embodiment, the tubular body 2
A part of the eccentricity is cut out at a position eccentric from the axis O1-O1 of the pipe body 2 to provide an eccentric cutout hole 2A, and a separately molded injection valve holder 3 is fitted in the eccentric cutout hole 2A. By providing welding means between the eccentric cutout hole 2A and the outer peripheral surface of the large-diameter cylindrical portion 3A, the injection valve holder 3 is fixed to the tube body 2 at an eccentric position. Therefore, in the injection valve holder 3, only a part of the large-diameter cylindrical portion 3A fitted into the eccentric cutout hole 2A of the pipe body 2 is welded, so that the welding distortion is suppressed and the injection valve holder 3 is deformed. Can be prevented.

As a result, the injection valve holder 3 can be set to have a low strength against deformation such as welding distortion, that is, can be formed to be thin, so that it is an inexpensive means for manufacturing the injection valve holder 3. Deep drawing by pressing can be applied, and the manufacturing cost can be reduced.

Further, the fuel injection valve 11 is provided in the injection valve holder 3.
Since the lid body 4 fixing the is molded by press working, the manufacturing cost of the lid body 4 can be reduced.

Further, the lid body 4 has one hooking portion 4B.
The injection valve holder 3 has one side projecting portion 3D (the hook hole 3
G) and the other overhanging portion 4C is screwed to the other side overhanging portion 3E of the injection valve holder 3 by using a set screw 5, so that the fuel injection valve 11 is attached to the injection valve holder 3. The detaching work can be easily performed by attaching and detaching one set screw 5, and the assembling workability and the maintenance workability can be improved.

In the embodiment, a 2-cylinder engine,
Taking as an example a case where two injection valve holders 3 (fuel injection valves 11) are provided in the pipe body 2 in order to supply fuel to two cylinders on one side of a V-type four-cylinder engine or a horizontally opposed four-cylinder engine. However, the present invention is not limited to this. For example, when fuel is supplied to one cylinder on one side of a single cylinder engine, a V type two cylinder engine, or a horizontally opposed two cylinder engine, one injection is made on the pipe body 2. Only the valve holder 3 needs to be provided. Also,
3-cylinder engine, V-6 cylinder engine or horizontally opposed 6
When fuel is supplied to the three cylinders on one side of the cylinder engine, the pipe body 2 only needs to be provided with the three injection valve holders 3. In this way, the number of injection valve holders 3 can be appropriately set according to the number of cylinders.

Further, in the embodiment, the lid body 4 has a structure in which one is hooked on the injection valve holder 3 and the other is screwed, but the present invention is not limited to this, and for example, one It is good also as a structure which screw-fastens both.

Further, in the embodiment, the fuel supply pipe 1
Although the supply side pipe 15 and the return side pipe 16 are connected to each other and the fuel is circulated and supplied by the full-return type fuel supply system, the present invention is not limited to this, and the return side pipe 16 is eliminated and the The fuel may be supplied using a return type fuel supply system.

[0040]

As described in detail above, according to the invention of claim 1, the eccentric cutout hole is formed by cutting a part of the pipe body at a position eccentric from the axis of the pipe body, and the injection valve holder is formed. Is fixed to the eccentric cutout hole of the pipe body by welding means, so that the injection valve holder is welded only to the part fitted in the eccentric cutout hole of the pipe body, thus suppressing welding distortion. It is possible to prevent the injection valve holder from being deformed.

As a result, the injection valve holder can be formed thin with low strength against deformation such as welding distortion, and therefore, as a means for manufacturing the injection valve holder, for example, deep drawing by inexpensive press working. Can be applied, and the manufacturing cost can be reduced.

According to the invention of claim 2, an eccentric cutout hole is formed by cutting a part of the pipe body at a position eccentric from the axis of the pipe body, and the injection valve holder is formed in the eccentric cutout hole of the pipe body. Since the lid body that is fixed by welding means and that fixes the fuel injection valve inserted into the injection valve holder in the retaining state is attached to the insertion opening side of the injection valve holder, the injection valve holder is equipped with a pipe body. Since welding is only applied to a part fitted in the eccentric cutout hole, welding distortion can be suppressed and deformation of the injection valve holder can be prevented.

As a result, the injection valve holder can be formed thin with low strength against deformation such as welding distortion, and therefore, as a means for manufacturing the injection valve holder, for example, deep drawing by inexpensive press working. Can be applied, and the manufacturing cost can be reduced. Further, the lid body can fix the fuel injection valve in the injection valve holder so as not to be pulled out.

According to the third aspect of the invention, the injection valve holder is formed by press working, so that the injection valve holder can be manufactured at low cost.

According to the fourth aspect of the invention, the lid body is detachably attached to the injection valve holder by hooking one on the injection valve holder and screwing the other on the injection valve holder. The lid can be attached and removed by simply attaching and detaching one screw, and the fuel injection valve can be easily attached to and detached from the injection valve holder, improving the assembly workability and maintenance workability. You can

[Brief description of drawings]

FIG. 1 is a front view showing a fuel supply pipe according to an embodiment of the present invention.

FIG. 2 is a plan view of the fuel supply pipe as seen from the direction of arrows II-II in FIG.

FIG. 3 is an enlarged vertical cross-sectional view of an injection valve holder, a lid, a fuel injection valve, etc., which is enlarged from the direction of the arrow III-III in FIG.

FIG. 4 is a right side view of the pipe body and the injection valve holder as seen from the direction of arrows IV-IV in FIG.

5 is a cross-sectional view of the pipe body and the injection valve holder as viewed in the direction of the arrow VV in FIG.

6 is a cross-sectional view showing the tube body in FIG. 5 as a single body.

FIG. 7 is a vertical cross-sectional view showing a single injector valve holder.

8 is a plan view of the injection valve holder as seen from the direction of arrows VIII-VIII in FIG. 7. FIG.

FIG. 9 is a vertical cross-sectional view showing the lid alone.

FIG. 10 is a plan view of the lid body as viewed in the direction of arrow XX in FIG.

[Explanation of symbols]

1 Fuel Supply Piping 2 Tubular Body 2A Eccentric Notch Hole 3 Injection Valve Holder 3G Hooking Hole 3H Screw Hole 3L Insertion Opening 4 Lid 4B Hooking Stopper 4D Screw Insert Hole 5 Set Screw O1-O1 Tubular Axis O2-O2 Injection Eccentric dimension of injection valve holder (eccentric cutout hole) with respect to axis e of valve holder

Claims (4)

[Claims] 1. An eccentric cutout hole is formed by notching a part of a pipe for supplying fuel to an internal combustion engine at a position eccentric from the axis of the pipe, and a fuel injection valve is accommodated separately from the pipe. A fuel supply pipe formed by molding an injection valve holder, and fixing the injection valve holder to the eccentric cutout hole of the pipe body by welding means. 2. An eccentric cutout hole is formed by cutting out a part of a pipe for supplying fuel to an internal combustion engine at a position eccentric from the axis of the pipe, and a fuel injection valve is housed separately from the pipe. Forming an injection valve holder, fixing the injection valve holder to the eccentric cutout hole of the pipe body by welding means, inserting the fuel injection valve into the injection valve holder through the insertion opening, and inserting the injection valve holder. A fuel supply pipe with a lid attached to the opening side to fix the fuel injection valve in a locked state. 3. The fuel supply pipe according to claim 1, wherein the injection valve holder is formed by press working. 4. The lid is detachably attached to the injection valve holder by hooking one of the lids to the injection valve holder and screwing the other to the injection valve holder. Fuel supply piping.