JP3307157B2 - Fuel injection pipe introduction device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a device for introducing a fuel injection pipe into a locker room of a diesel engine or the like.

[0002]

2. Description of the Related Art In a four-valve diesel engine,
Since the fuel injection nozzle is disposed in the locker chamber above the cylinder head, when the fuel injection nozzle 1 is connected to the fuel injection nozzle 1 from the outside as shown in FIG. Alternatively, the connector 3 is screwed into the vertical wall on the upper surface of the cylinder head to which the rocker cover is attached, and the ends of the fuel injection pipes 1 are connected to the inner and outer ends of the connector 3 by the union nut 4, respectively. The injection tube 1 is configured to be introduced. Further, Japanese Utility Model Laid-Open No. 1-125858 also discloses the same content as described above.

In this case, however, the connector 3
The union nuts 4 must be fitted to both ends of the fuel injection pipes 1 connected to the fuel injection pipes 1 and reciprocated along the fuel injection pipes 1. Therefore, straight sections are set at both ends of the fuel injection pipes 1. Therefore, the introduction of the fuel injection pipe 1 into the locker room requires a relatively large space. Therefore, in a small engine such as a small engine, the installation of the fuel injection pipe 1 is limited. In addition, since the fuel injection pipe 1 is divided at a portion connected to the connector 3, the fuel injection pipe 1
It was inevitable that the fuel flow resistance would increase.

[0004]

SUMMARY OF THE INVENTION An object of the present invention is to make it possible to easily introduce a fuel injection pipe into a locker room of an engine with a compact structure.

[0005]

For this reason, the fuel injection pipe introducing device according to the present invention is inserted into a hole which is inserted through a wall partitioning a locker room of an engine from the outside and an inner surface thereof is inclined, and is fitted into the hole. A rubber seal formed with a shaft hole through which the fuel injection pipe is inserted and provided with a cut connecting the shaft hole and the outer peripheral surface, and the rubber seal provided on the inner surface of the hole.
And a pressing member that presses against the outer peripheral surface of the fuel injection pipe .

[0006]

In other words, since the rubber seal is provided with a cut connecting the shaft hole and the outer peripheral surface, the cut is elastically opened and closed so that the fuel injection pipe is inserted into the shaft hole of the rubber seal. A rubber seal with the fuel injection pipe inserted through the shaft hole is fitted into the hole in the wall surface that separates the locker chamber from the outside, and the inclined inner surface of the hole and the fuel are pressed by the pressing member. Since the fuel injection pipe is pressed against the outer peripheral surface of the injection pipe, the fuel injection pipe is supported in the shaft hole of the rubber seal, so that the fuel injection pipe can be easily introduced into the locker chamber from the outside, and the rubber seal is also provided. Presses the outer peripheral surface of the fuel injection pipe and the inclined inner surface of the wall hole, and the gap itself of the rubber seal is pressed against each other, so that the locker chamber and the outside can be reliably sealed.

[0007]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, embodiments of the present invention will be described by assigning the same reference numerals to the same parts as those of the conventional apparatus and the same parts of each embodiment. 1 to 3, a small-diameter hole 10 inside the locker chamber and a large-diameter hole 1 outside the locker case 2 of the four-valve diesel engine or the vertical wall on the upper surface of the cylinder head to which the rocker cover is attached are provided.
1 and an inner conical round hole 12 is formed, and an inner groove 13 is formed in the large-diameter hole 11 near the round hole 12.
Are formed.

The rubber seal 14 has an outer peripheral surface 15 having a slope substantially coincident with the axial inclination of the inner surface of the round hole portion 12, a central shaft hole 16 is formed, and the central shaft hole 16 and the outer peripheral surface 15 are formed. A joint 17 is provided to connect the fuel injection pipe 1 to the central shaft hole 16 by elastically opening the joint 17 as shown in FIG. 2 and then closing the joint 17 as shown in FIG. In this state, as shown in FIG. 1, the seal 14 is fitted into the round hole portion 12 from the large-diameter hole 11 side, and the washer 18 engaged with the fuel injection pipe 1 is entirely applied to the side surface of the seal 14 so that The seal 14 is axially pressed into the round hole 12 through the washer 18 by the snap ring 19 fitted in the groove 13, so that the fuel injection pipe 1 is sealed in the round hole 12 of the rocker case 2. Supported by 14,
It is introduced from outside into the locker room. The small-diameter hole 10 has only to have a minimum size that allows a union nut for connecting the end of the fuel injection pipe 1 to a fuel injection nozzle (not shown) in the locker chamber to pass easily.

In the above device, the joint 17 of the rubber seal 14 is elastically opened and the fuel injection pipe 1 is inserted into the central shaft hole 16.
After that, the abutment 17 is closed, the seal 14 is fitted into the round hole portion 12, and the washer 1 engaged with the fuel injection pipe 1 is inserted.
When the snap ring 19 is fitted into the inner groove 13 with the seal 8 in contact with the side surface of the seal 14, after the locker case 2 or the rocker cover is attached to the upper surface of the cylinder head, the fuel injection pipe 1 is inserted into the locker chamber from the outside. , The operation is very simple, and at the same time, it is easy to make the mounting of the seal 14 more accurate.
It is not necessary to cut off the fuel injection pipe 1 at the insertion part of
There is no need to prepare a special specification for the fuel injection pipe 1, and therefore, there is an advantage that the assemblability of the fuel injection pipe 1 to the engine can be greatly improved.

Further, since the fuel injection pipe 1 is not divided at the portion where the rocker case 2 is inserted, and the union nut is not used inside and outside the rocker case 2 as in the prior art, the fuel injection pipe 1 is inserted through the rocker case 2. It is not necessary to set a relatively long straight section in the fuel injection pipe 1 in the vicinity of
Therefore, the length of the fuel injection pipe 1 can be relatively small,
Even when the equipment space is narrow like a small engine, the fuel injection pipe 1 can be easily introduced into the locker room from the outside.

Further, since the fuel injection pipe 1 is not divided at the portion where the rocker case 2 is inserted, the flow resistance of the fuel in the fuel injection pipe 1 does not increase on the way as in the related art.

In addition, since the rubber seal 14 is axially pressed into the round hole portion 12 through the washer 18 by the snap ring 19, the outer peripheral surface of the fuel injection pipe 1 inserted into the central shaft hole 16 and Since the rubber seal 14 presses the inner surface of the rocker case round hole portion 12 by its internal stress, and at the same time, the internal joint 17 of the rubber seal 14 is pressed against each other by the internal stress of the rubber seal 14. The inside and outside of the rocker case round hole 12 can be sealed automatically and reliably.

Next, in the embodiment shown in FIGS. 4 and 5, the locker case 2 of the four-valve diesel engine or the vertical wall on the upper surface of the cylinder head to which the rocker cover 20 is attached is provided with a half section on the inside of the locker chamber. A circular upward recess 21 and an outward semi-conical upward recess 22 are formed, and the rocker cover 20 has a semicircular downward recess 23 on the inner side of the locker chamber and a downward concave 23 on the outer side. A semi-conical downward recess 24 is formed, and both recesses 21 and 2 are formed.
The small hole 10 is constituted by 3 and the conical round hole 12 is formed by the recesses 22 and 24.

The frusto-conical rubber seal 14 has an outer peripheral surface 15 having a slope substantially coincident with the axial inclination of the inner surface of the round hole portion 12 as in the above embodiment, and a central shaft hole 16 is formed. In addition, a joint (not shown) is provided for connecting the central shaft hole 16 and the outer peripheral surface 15 by bending and connecting the fuel injection pipe 1 to the central shaft hole 16 through the joint. Is fitted into the round hole portion 12 from the outside, and the presser plate 25 engaged with the fuel injection pipe 1 straddles the rocker case 2 or the vertical wall of the cylinder head and the rocker cover 20 from the outside. Bolted,
The seal 14 is pressed into the round hole 12 by the holding plate 25, and as a result, the fuel injection pipe 1 is inserted into the round hole 12 formed at the joint between the rocker case 2 or the vertical wall of the cylinder head and the rocker cover 20. It is supported by the seal 14 and is introduced into the locker chamber from outside.

According to this embodiment, the same operation and effect as those of the above embodiment can be obtained.
4 is disposed between the rocker case 2 or the vertical wall of the cylinder head and the rocker cover 20, so that the mounting is further facilitated, while the number of parts is reduced and the cost can be reduced. The above effect is great.

Further, in the embodiment shown in FIGS. 6 and 7, an upward recess 30 having a semicircular cross section is formed in the locker case 2 of the engine or the vertical wall on the upper surface of the cylinder head to which the rocker cover 20 is attached. And the rocker cover 20 has a downward recess 31 having a semicircular cross section.
Are formed, and a through hole 32 having a circular cross section is formed by the two concave portions 30 and 31, and the inner peripheral edge 33 of the through hole 32 is
4 and a liquid packing is applied between them to seal the inside, while the lid material 34 is formed with the inner surface conical round hole 12 and a round shape. An inner groove 13 is formed near the hole 12.

The frusto-conical rubber seal 14 has an outer peripheral surface 15 having a slope substantially coinciding with the axial inclination of the inner surface of the round hole portion 12 as in the above embodiments, and a central shaft hole 16.
Are formed, and an abutment (not shown) is provided for connecting the central shaft hole 16 and the outer peripheral surface 15 by bending them.
With the fuel injection pipe 1 inserted into the central shaft hole 16 through the opening, the seal 14 is fitted into the round hole portion 12 from the outside, and the washer 1 engaged with the fuel injection pipe 1 is further inserted.
8 is entirely applied to the side surface of the seal 14 so that the inner groove 13
The washer 18 is provided by a snap ring 19 fitted on the
The seal 14 is axially pressed into the round hole 12 through the fuel injection pipe 1, and as a result, the fuel injection pipe 1 is closed by the lid member 34 disposed at the joint between the rocker case 2 or the vertical wall of the cylinder head and the rocker cover 20. It is supported by the seal 14 in the round hole 12 and is introduced into the locker chamber from outside.

In this embodiment, the same operation and effects as those of the above-described embodiments can be obtained. In addition, by disposing the lid member 34 between the vertical wall of the cylinder head and the rocker cover 20, the locker Since the case 2 can be easily omitted, the number of components can be further reduced from this aspect.

In each of the above embodiments, the round hole formed in the rocker case or the like and the rubber seal fitted therein have a large diameter on the outer side. It is also possible to have a large diameter inside the rocker cover.Also, the abutment provided in the rubber seal is changed to a simple slit shape, and the internal stress of the rubber seal is reduced by pressing against the rubber seal. It goes without saying that the pressing force may act on the mating surface.

[0020]

In the fuel injection pipe introducing apparatus according to the present invention, the fuel injection pipe is inserted into the shaft hole of the rubber seal by elastically opening and closing the cut provided in the rubber seal. The seal is fitted into a hole in the wall surface that separates the locker chamber from the outside, and the rubber seal is pressed against the inclined inner surface of the hole and the outer peripheral surface of the fuel injection pipe by a pressing member, so that the seal enters the locker chamber. The fuel injection pipe can be easily introduced from, and at that time, it is not necessary to cut the fuel injection pipe halfway and connect both ends with a connector, so the fuel injection pipe can be easily introduced even in a narrow place. In addition to this, the versatility of the fuel injection pipe can be increased, which is very convenient in practice.

[Brief description of the drawings]

FIG. 1 is an enlarged longitudinal sectional view of an embodiment of the present invention.

FIG. 2 is an exploded perspective view of a main part of the embodiment.

FIG. 3 is an assembled perspective view of a main part of the embodiment.

FIG. 4 is an enlarged longitudinal sectional view of another embodiment of the present invention.

FIG. 5 is a view taken in the direction of arrows VV in FIG. 4;

FIG. 6 is an enlarged longitudinal sectional view of still another embodiment of the present invention.

FIG. 7 is a view taken in the direction of arrows VII-VII in FIG. 6;

FIG. 8 is an enlarged longitudinal sectional view of a conventional device.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Fuel injection pipe 2 Rocker case 12 Round hole part 14 Rubber seal 16 Central shaft hole 17 Abutment 18 Washer 19 Snap ring 20 Rocker cover 25 Holding plate 32 Through hole 34 Cover material

Continuation of the front page (58) Field surveyed (Int. Cl. ⁷ , DB name) F02M 55/02 330 F02M 37/00 321 F02F 7/00 F02F 11/00 F16J 15/10

Claims (4)

(57) [Claims] An inner surface which is inserted into a wall partitioning a locker chamber of an engine from an outer side of the engine and has a slanted inner surface, a shaft hole which is fitted into the hole and through which a fuel injection pipe is inserted, is formed; A rubber seal provided with a cut connecting the surface and the fuel seal;
A fuel injection pipe introduction device having a pressing member that presses against an outer peripheral surface of an injection pipe. 2. The fuel injection pipe introducing device according to claim 1, wherein the inner surface of the hole has a conical shape extending outward. 3. The fuel injection pipe introducing device according to claim 1, wherein a lid is attached to a through hole formed at a joint between the wall surfaces, and the hole is provided in the lid. 4. The fuel injection pipe introducing device according to claim 1, wherein the cut is a bent joint.