JPH11241660A - Injector assembling method for fuel injection system - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an injector assembling method for hydraulic actuating electronic control fuel injection system by which an injector and an oil rail can be assembled with a cylinder head with high accuracy and sureness. SOLUTION: After an oil rail 3 and an injector 4 are set to a cylinder head 5 and are fixed to the cylinder head 5 by finally fastening a bolt on the side of the injector 4, the oil rail 3 and the injector 4 are directly coupled, and subsequently, the oil rail 3 and the injector 4 are fixed to the cylinder head 5 by finally fastening a bolt on the side of the oil rail 3. As a result, even if the mutual positional relation of the cylinder head 5, the oil rail 3 and the injector 4 is subtly deviated, the injector 4 is mounted on the cylinder head 5 at a prescribed angle with high accuracy and sureness.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for assembling an injector and an oil rail of a HEUI system (a hydraulically operated electronically controlled fuel injection device) applied to a diesel engine to a cylinder head.

[0002]

2. Description of the Related Art Conventionally, as a fuel injection system applied to a diesel engine, a hydraulically operated electronically controlled fuel injection system (hereinafter referred to as a HEUI system) as disclosed in Japanese Patent Publication No. Hei 6-511524 has been known. ing.

In this HEUI system, a part of the engine oil stored in an oil pan 1 is pressurized to a high pressure by a high-pressure oil pump 2 as shown in FIG.
And then supply the fuel to each of the injectors 4, 4, 4, and 4 by using the hydraulic pressure.
A pressure booster piston (not shown) provided in each of the injectors 4, 4, 4, 4 is actuated.
The fuel supplied to the combustion chamber is pressurized to an injection pressure to perform fuel injection into each combustion chamber.

[0004]

By the way, the oil rail 3 and the injector 4 constituting such an HEUI system are integrally assembled to the cylinder head by a plurality of bolts or nuts. 3, since the injector 4 and the cylinder head have very small mechanical errors, when the oil rail 3 and the injector 4 are assembled to the cylinder head, their positional relationship is slightly shifted from each other. There is. Therefore, if the oil rail 3 and the injector 4 are forcibly assembled on the cylinder head side as they are, the adverse effects thereof will be remarkably exhibited on the injector 4 side, and the injector 4 will be mounted on the oil rail 3 as well as on the cylinder head side.
A disadvantage arises in that it is not possible to assemble with high accuracy on the side.

That is, a passage for cooling water, fuel, lubricating oil and the like is formed around the injector in the cylinder head of the diesel engine to which the HEUI system is applied. If it is not inserted by being inserted into the mounting hole at a specified angle, it may be possible that an obstacle will be caused in each passage or that the injector 4 will malfunction.

In the HEUI system, each injector 4 is connected to an oil rail 3 lying on a cylinder head.
In this method, the oil rail 3 and the injector 4 are permanently tightened and fixed to the cylinder head side, and then the injector 4 is connected to the oil rail 3 side. In the worst case, if the connecting portion is displaced, high pressure oil may leak from the connecting portion.

Therefore, the present invention has been devised in order to effectively solve such a problem, and an object of the present invention is to securely connect an injector and an oil rail and to connect the injector and the oil rail to a cylinder head. It is intended to provide a novel HEUI system injector assembling method capable of assembling with high accuracy and surely.

[0008]

SUMMARY OF THE INVENTION In order to solve the above-mentioned problems, the present invention relates to an HEUI system (a hydraulically operated electronically controlled fuel injection system) and a plurality of bolts or oil rails directly attached to the injector. In a method of assembling on a cylinder head with a nut, the oil rail and the injector are set at a predetermined assembling position of the cylinder head, and a bolt or a nut for assembling the injector to the cylinder head is fully tightened, and the cylinder head side is set. After assembling the injector, the bolts or nuts for connecting the oil rail and the injector are fully tightened, and this injector is directly attached to the oil rail, and then the bolts or nuts on the oil rail side are fully tightened. Fix this oil rail to the cylinder head side. It is designed to be fixed and assembled.

That is, first, by completely tightening a bolt or a nut for assembling the injector to the cylinder head, the injector can be securely attached to a predetermined position of the cylinder head at a predetermined angle and fixed.

Next, a bolt or a nut for connecting the oil rail and the injector is fully tightened, and the injector is directly mounted on the oil rail, so that the connection between the oil rail and the injector is securely performed. The supply of oil and the like between the rail and the injector is reliably performed.

After that, the oil rail is fixed to the cylinder head side by tightening bolts or nuts for fixing the oil rail, and the oil rail is fixed to the cylinder head side. It can be securely assembled on the head side.

[0012]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Next, a preferred embodiment of the present invention will be described with reference to the accompanying drawings.

FIGS. 1 to 4 show an embodiment of a method for assembling an injector according to the present invention. In the drawings, reference numeral 5 denotes a cylinder head, and reference numeral 3 denotes a cam carrier. The cylindrical oil rails 4 and 4 are injectors (four in the present embodiment) directly attached to the oil rails.

As shown in FIG. 1, the oil rail 3 is assembled on the cylinder head 5 by four mounting bolts 6, 6, 6, 6 and two nuts 7, 7. On its side, the injector 4,
Mounting fungi 8,8,8,8 for directly attaching 4,4,4
8 are provided. In the figure, 9 is the oil rail 3
Oil supply unit to take in high pressure oil supplied from
Reference numeral 10 denotes an oil discharge unit that discharges excess oil in the oil rail 3.

In order to assemble the oil rail 3 and the injector 4 of the HEUI system on the cylinder head 5, the oil rail 3 must first be set on the cylinder head 5 as shown in FIGS. And the mounting bolts 6, 6, 6, 6 and nuts 7, 7
Is temporarily fixed at a predetermined position by using. At this time, it is important that the mounting bolts 6, 6, 6, 6 and the nuts 7, 7 are not completely tightened, and that the oil rail 3 is slightly loose and fine adjustment is possible. .

Next, as shown in FIGS. 3 and 4, each of the injectors 4, 4, 4, 4 is connected to a cylinder head 5 respectively.
After being set by inserting it into a mounting hole (not shown), each of the oil rails 3 temporarily fixed on the cylinder head 5 by a U-shaped connecting member 11 and a pair of connecting bolts 12, 12. Directly attached to the flanges 8, 8, 8, 8 respectively. At this stage, each connecting bolt 1
It is important to keep the injectors 4, 4, 4, and 4 slightly loose and capable of fine adjustment in the same manner as the oil rail 3, without completely tightening the nuts 2 and 12 completely.

After the oil rail 3 and the injectors 4, 4, 4, 4 are temporarily fixed on the cylinder head 5 in this manner, as shown in FIG. 4, a pair of H-shaped fixing members 13, 13, a pair of fixing nuts 14, 14
Into the studs 15, 15 on the cam carrier 5 side,
This is fully tightened, and the injectors 4, 4, 4, and 4 set on the cylinder head 5 are assembled and fixed so as not to rattle. Then, the connecting bolts 12, 1
Fully tighten 2.

Thus, each injector 4, 4,
Since the components 4 and 4 are accurately assembled to the cylinder head 5 while maintaining a predetermined installation angle, even if vibrations during operation are applied, the installation angles do not shift and high reliability can be exhibited.

Each of these injectors 4, 4, 4,
Since the oil rail 3 and the connecting portion thereof which are directly attached to the nut 4 are slightly loose and can be finely adjusted, when the injectors 4, 4, 4, and 4 are fully tightened, it is impossible for the connecting portion to make a connection. With no force applied, each injector 4, 4, 4, 4
There is no risk of adverse effects such as shifting the insertion angle on the side. That is, even if the relative positions of the oil rail 3 and the injectors 4, 4, 4, 4 with respect to the cylinder head 5 are slightly shifted due to a mechanical error, the oil rail 3 is slightly moved up and down, back and forth, and left and right. By the looseness of the parts, the deviation can be effectively absorbed without interfering with the final tightening of the injectors 4, 4, 4, and 4. After the injectors 4, 4, 4, and 4 have been fully tightened in this way, the connecting portions of the oil rail 3 and the injectors 4, 4, 4, and 4 are fully tightened. Since the connection is reliably achieved, each injector 4, 4, 4,
4 is reliably supplied.

Finally, the mounting bolts 6, 6, on the oil rail 3 side temporarily fixed to the cylinder head 5 lastly.
By fully tightening the nuts 6, 6 and the nuts 7, 7, the oil rail 3 can be securely attached to the cylinder head 5 side without applying excessive force to the injectors 4, 4, 4, 4 and the connection portion thereof. Become.

In this embodiment, one oil rail 3 is used.
In the above, four injectors 4, 4, 4, 4 were used, but the same effect can be obtained even if the ratio is increased or decreased as necessary. Needless to say, the number of mounting bolts 6 and the like for mounting them, the mounting position, and the like may be changed as necessary.

[0022]

In summary, according to the present invention, even if there is some mechanical error in the cylinder head, oil rail, etc., each injector can be accurately and easily adjusted without adversely affecting the insertion angle of the cylinder head. Can be attached to the head. Therefore, it is possible to exhibit excellent effects such as being able to contribute to improvement of the quality and reliability of the diesel engine using the HEUI system.

[Brief description of the drawings]

FIG. 1 is a perspective view showing a state before an oil rail is set on a cylinder head.

FIG. 2 is a perspective view showing a state where an oil rail is set on a cylinder head.

FIG. 3 is a perspective view showing a state where an injector is set on a cylinder head on which an oil rail is set.

FIG. 4 is a perspective view showing a state in which an injector set on a cylinder head is fully tightened.

FIG. 5 is a schematic diagram showing a basic configuration of a conventional HEUI system according to the present invention.

[Explanation of symbols]

 3 Oil rail 4 Injector 5 Cylinder head 6 Mounting bolt 7,14 Nut 12 Connecting bolt

────────────────────────────────────────────────── ───

[Procedure amendment]

[Submission date] March 19, 1998

[Procedure amendment 2]

[Document name to be amended] Statement

[Correction target item name] Name of invention

[Correction method] Change

[Correction contents]

Patent application title: Method of assembling injector for fuel injection device

[Procedure amendment 3]

[Document name to be amended] Statement

[Correction target item name] Claims

[Correction method] Change

[Correction contents]

[Claims]

[Procedure amendment 4]

[Document name to be amended] Statement

[Correction target item name] 0001

[Correction method] Change

[Correction contents]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for assembling an injector and an oil rail of a hydraulically operated electronically controlled fuel injection system applied to a diesel engine to a cylinder head.

[Procedure amendment 5]

[Document name to be amended] Statement

[Correction target item name] 0002

[Correction method] Change

[Correction contents]

[0002]

Conventionally, as a fuel injection system applied to a diesel engine, a hydraulically-actuated electronically-controlled fuel injection systems are known, such as shown in Patent Kohyo 6-511524 Publication.

[Procedure amendment 6]

[Document name to be amended] Statement

[Correction target item name] 0003

[Correction method] Change

[Correction contents]

In this hydraulically operated electronically controlled fuel injection system, a part of the engine oil stored in an oil pan 1 is pressurized to a high pressure by a high pressure oil pump 2 and temporarily stored in an oil rail 3 as shown in FIG. Thereafter, the pressure is supplied to a plurality of injectors 4, 4, 4, 4, respectively, and the hydraulic pressure activates a pressure-increasing piston (not shown) provided in each of the injectors 4, 4, 4, 4, so that each injector 4 The fuel supplied to 4, 4, 4, and 4 is pressurized to an injection pressure to perform fuel injection into each combustion chamber.

[Procedure amendment 7]

[Document name to be amended] Statement

[Correction target item name] 0004

[Correction method] Change

[Correction contents]

[0004]

By the way, such a problem is solved.
The oil rail 3 and the injector 4 constituting the hydraulically operated electronic control fuel injection system are integrally assembled to the cylinder head by a plurality of bolts or nuts.
In addition, since a very small mechanical error occurs in the cylinder head, when the oil rail 3 and the injector 4 are assembled to the cylinder head, their positional relationship may be slightly deviated from each other. Therefore, if the oil rail 3 and the injector 4 are forcibly assembled on the cylinder head side as they are, the adverse effect will be remarkably exhibited on the injector 4 side. However, there is a disadvantage that the operation cannot be performed.

[Procedure amendment 8]

[Document name to be amended] Statement

[Correction target item name] 0005

[Correction method] Change

[Correction contents]

That is, the hydraulically operated electronically controlled fuel injection
A passage for cooling water, fuel, lubricating oil, and the like is formed around the injector in the cylinder head of the diesel engine to which the injection system is applied, and the injector 4 is defined with respect to the mounting hole of the cylinder head. If it is not attached by inserting at an angle, it is conceivable that an obstacle may be caused to each passage or malfunction of the injector 4 may occur.

[Procedure amendment 9]

[Document name to be amended] Statement

[Correction target item name] 0006

[Correction method] Change

[Correction contents]

Further, in the above-mentioned hydraulically operated electronically controlled fuel injection system , each injector 4 is directly attached to the oil rail 3 lying on the cylinder head, and is integrated. In the method of connecting the injector 4 to the oil rail 3 side after the oil rail 3 and the injector 4 are fully tightened and fixed to the cylinder head side, in the worst case, if the connecting portions are shifted, the high pressure oil is removed from the connecting portion. May leak out.

[Procedure amendment 10]

[Document name to be amended] Statement

[Correction target item name] 0008

[Correction method] Change

[Correction contents]

[0008]

SUMMARY OF THE INVENTION In order to solve the above-mentioned problems, the present invention provides a cylinder head using a plurality of bolts or nuts to connect an injector of a hydraulically operated electronically controlled fuel injection system and an oil rail directly attached to the injector. In the method of assembling above, the oil rail and the injector are set at predetermined assembly positions of the cylinder head, and bolts or nuts for assembling the injector to the cylinder head are fully tightened, and the injector is assembled to the cylinder head side. After that, the bolts or nuts for connecting the oil rail and the injector are fully tightened and this injector is directly attached to the oil rail, and then the oil rail side bolts or nuts are fully tightened and the oil rail is Fix it to the cylinder head side and assemble It was made.

[Procedure amendment 11]

[Document name to be amended] Statement

[Correction target item name] 0015

[Correction method] Change

[Correction contents]

In the above, the above-mentioned hydraulically operated electronic control
In order to assemble the oil rail 3 and the injector 4 of the fuel injection system on the cylinder head 5, first, as shown in FIGS. 1 and 2, the oil rail 3 is set on the cylinder head 5 and the mounting bolt 6 , 6,6,
6 and are temporarily fixed at predetermined positions by using nuts 7 and 7. At this time, it is important that the mounting bolts 6, 6, 6, 6 and the nuts 7, 7 are not completely tightened, and that the oil rail 3 is slightly loose and fine adjustment is possible. .

[Procedure amendment 12]

[Document name to be amended] Statement

[Correction target item name] 0022

[Correction method] Change

[Correction contents]

[0022]

In summary, according to the present invention, even if there is some mechanical error in the cylinder head, oil rail, etc., each injector can be accurately and easily adjusted without adversely affecting the insertion angle of the cylinder head. Can be attached to the head. Therefore, hydraulically operated electronic control
Excellent effects such as being able to contribute to improvement in quality and reliability of a diesel engine using a fuel injection system can be exhibited.

[Procedure amendment 13]

[Document name to be amended] Statement

[Correction target item name] Brief description of drawings

[Correction method] Change

[Correction contents]

[Brief description of the drawings]

FIG. 1 is a perspective view showing a state before an oil rail is set on a cylinder head.

FIG. 2 is a perspective view showing a state where an oil rail is set on a cylinder head.

FIG. 3 is a perspective view showing a state where an injector is set on a cylinder head on which an oil rail is set.

FIG. 4 is a perspective view showing a state in which an injector set on a cylinder head is fully tightened.

FIG. 5 shows a conventional hydraulically operated electronically controlled fuel injection according to the present invention.
It is the schematic which shows the basic structure of a projection system.

[Description of Signs] 3 Oil rail 4 Injector 5 Cylinder head 6 Mounting bolt 7, 14 Nut 12 Connection bolt

 ──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Jun Jun Otsuka 8 Dosana, Fujisawa-shi, Kanagawa Prefecture Isuzu Motors Fujisawa Co., Ltd. (72) Inventor Kohei Yamaishi 8th floor of Tsurana, Fujisawa-shi, Kanagawa Prefecture Isuzu Motors Fujisawa Plant

Claims (1)

[Claims] 1. A method of assembling an injector of a HEUI system (a hydraulically operated electronically controlled fuel injection system) and an oil rail directly attached to the injector on a cylinder head with a plurality of bolts or nuts. Is set at a predetermined assembling position of the cylinder head, a bolt or a nut for assembling the injector to the cylinder head is fully tightened, and the injector is assembled to the cylinder head side, and then the oil rail and the injector are connected. This injector was directly attached to the oil rail by fully tightening the bolts or nuts, and then the oil rail side bolts or nuts were fully tightened and the oil rail was fixed to the cylinder head side and assembled. HEUI system characterized by that How to assemble the injector with the stem.