JPH08303323A - Fuel injection pipe introduction device - Google Patents

Abstract

PURPOSE: To introduce a fuel injection pipe easily into a locker chamber of an engine due to a compact configuration. CONSTITUTION: A rubber O ring 12 on which a semi-circular cap part 13 is integrally molded is arranged on whole periphery of a top face of a cylinder head 11 on which a locker cover 10 of an engine is attached. A fuel injection pipe 1 is inserted into a shaft hole 16 of the rubber O ring 12 from a slit 17, and the rubber O ring 12 is pressed against the top face of the cylinder head 11 by covering a recessed part 18 of the locker cover 10 by the rubber O ring 12.

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 rocker chamber 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 arranged in the rocker chamber above the cylinder head, when the fuel injection pipe 1 is connected to the fuel injection nozzle from the outside as shown in FIG. 5, the rocker case 2, Alternatively, the connector 3 is externally screwed into the vertical wall of the upper surface of the cylinder head to which the rocker cover is attached, and the ends of the fuel injection pipe 1 are connected to the inner and outer ends of the connector 3 by the union nut 4, respectively, and the fuel is fed into the rocker chamber. It is configured to introduce the injection pipe 1. In addition, Japanese Utility Model Laid-Open No. 125858/1990 describes the same contents as above.

However, in this case, the connector 3
Since the union nuts 4 must be fitted to both ends of the fuel injection pipe 1 connected to the fuel injection pipe 1 and reciprocated along the fuel injection pipe 1, straight line portions are set at both ends of the fuel injection pipe 1. Therefore, since a relatively large space is required to introduce the fuel injection pipe 1 into the locker chamber, the introduction of the fuel injection pipe 1 is required for a small engine such as a small engine having a small equipment size. May occur, and since the fuel injection pipe 1 is divided at the portion connected to the connector 3, the fuel injection pipe 1
It was unavoidable that the distribution resistance of fuel in Japan increased.

[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 rocker chamber of an engine with a compact structure.

[0005]

Therefore, the fuel injection pipe introducing device according to the present invention is provided with a downward recess formed in a rocker cover of an engine and the rocker cover and the cylinder head fitted in the recess. Or, it has a rubber cap pressed between the rocker case, and the rubber cap has a shaft hole through which the fuel injection pipe is inserted and a slit connecting the shaft hole and the outer peripheral surface. There is.

[0006]

That is, since the rubber cap is provided with a slit connecting the shaft hole and the outer peripheral surface, the fuel injection pipe is inserted into the shaft hole of the rubber cap by elastically opening and closing the slit. While it can be easily inserted, the rubber cap with the fuel injection pipe inserted into the shaft hole is fitted into the downward recess formed in the rocker cover,
Since the fuel injection pipe is pressed between the rocker cover and the cylinder head or the rocker case, the fuel injection pipe is supported in the shaft hole of the rubber cap, and the fuel injection pipe can be easily introduced from the outside into the rocker chamber. At the same time, the rubber cap presses the outer peripheral surface of the fuel injection pipe, and the slits of the rubber cap are pressed against each other, so that the rocker chamber and the outside can be reliably sealed.

[0007]

Embodiments of the present invention will be described below by assigning the same reference numerals to the parts equivalent to those of the conventional device and the parts equivalent to the respective embodiments. 1 to 3, an O-ring 12 which is a rubber packing is arranged all around the upper surface of a cylinder head 11 to which a rocker cover 10 of a four-valve diesel engine is attached, and an O-ring 12 has a semicircular shape at a proper position. The cap portion 13 is integrally molded, and the outer peripheral surface 14 of the cap portion 13 also has a cap portion 1
A protrusion 15 that is continuous with the O-ring 12 other than 3
Is provided.

A central shaft hole 16 is formed in the cap portion 13, and the central shaft hole 16 and the outer peripheral surface 14 are formed.
A slit 17 for connecting the fuel injection pipe 1 and the fuel injection pipe 1 is inserted into the central shaft hole 16 by elastically opening the slit 17.

Further, at the bottom of the rocker cover 10,
A downward recess 18 having a cross section of substantially the same shape as the cap portion 13 is formed in a portion of the O-ring 12 corresponding to the cap portion 13, and a recess 19 is formed over the entire lower surface of the rocker cover 10. When the rocker cover 10 is attached to the upper surface of the cylinder head 11 with the ring 12 interposed therebetween, the O-ring 12 and the protrusion 15 thereof other than the cap portion 13 are fitted into the recess 19 and pressed vertically. The cap portion 13 is also pressed against the upper surface of the cylinder head 11, and the rocker cover 10 and the cylinder head 11 are provided over the entire circumference of the rocker cover 10.
While the space is sealed, the fuel injection pipe 1 is supported by the cap portion 13 in the recess 18 and introduced into the rocker chamber from the outside.

In the above apparatus, the slit 17 of the O-ring cap portion 13 is elastically opened, the fuel injection pipe 1 is inserted into the central shaft hole 16, the rocker cover 10 is attached to the cylinder head 11, and a space between them is provided. If the sandwiched O-ring 12 is pressed over the entire circumference thereof, the fuel injection pipe 1 can be introduced from the outside into the rocker chamber, so that the work is extremely simple, and, as in the conventional case, Since it is not necessary to divide the fuel injection pipe 1 at the portion where the rocker case is inserted, it is not necessary to prepare the fuel injection pipe 1 having a special specification. Therefore, the assemblability of the fuel injection pipe 1 to the engine is significantly improved. There are advantages.

Further, unlike the conventional case, the fuel injection pipe 1 is not divided at the rocker case insertion portion, and the use of the connector and the union nut is unnecessary, so that the introduction portion of the fuel injection pipe 1 into the rocker chamber is relatively long. Since it is not necessary to set a straight line portion, the length of the fuel injection pipe 1 can be relatively small, and even when the equipment space is small such as in a small engine, the fuel injection pipe 1 is introduced into the rocker chamber from the outside. Can be introduced easily.

Further, since the fuel injection pipe 1 is not divided at the intermediate portion as described above, the fuel injection pipe 1 is different from the conventional one.
The distribution resistance of the fuel in will not increase in the middle.

Moreover, the O-ring cap portion 13 is pressed against the upper surface of the cylinder head 11 by the substantially semicircular downward recess 18 of the rocker cover 10, and at this time, the inner surface of the rocker cover recess 18 and the outer periphery of the O-ring cap portion 13 are pressed. Since the surface is inclined in the circumferential direction of the rocker cover 10,
At the same time that the cap portion 13 presses the outer peripheral surface of the fuel injection pipe 1 inserted into the central shaft hole 16 by its internal stress, the closed slit 17 of the cap portion 13 also presses each other by the internal stress of the cap portion 13. Therefore, the inside and outside of the rocker cover recess 18 can be reliably sealed.

Next, in the embodiment shown in FIG. 4, the cap portion 13 of the O-ring 12 is provided with a substantially semi-conical outer peripheral surface 20 having a large diameter on the outside, and the cap portion 13 is provided on the lower surface thereof. A protrusion 21 continuous with the portion of the O-ring 12 other than 13 is provided, and the protrusion 21 is pushed into the recess 22 on the upper surface of the cylinder head 11, and
The lower recess 18 of the rocker cover 10 coincides with the outer peripheral surface 20 of the O-ring cap portion 13 and has a substantially semi-conical inner surface 23.
And the stopper 24 is formed at the outer end of the recess 18 so that the cap portion 13 is pushed into the recess 18, and the other portions have the same structure as the above embodiment. ,
It is possible to obtain substantially the same operational effects as those of the above-described embodiment, and since the outer peripheral surface 20 of the cap portion and the inner surface 23 of the rocker cover recess are inclined inward and outward of the rocker cover, the pressing force acting between them can be facilitated. It is possible to improve the sealing property at that portion by increasing the height.

In each of the above embodiments, the O-ring and the cap portion are integrally molded, but if necessary, they may be formed separately and the O-ring may be formed on the outer peripheral surface of the rubber cap portion. It is also possible to make the outer peripheral surface of the cap portion and the inner surface of the downward concave portion of the rocker cover into which the cap portion fits into a trapezoidal shape instead of the semicircular shape, which is equivalent to each of the embodiments. In addition, a small protrusion to the upper surface of the cylinder head is added to the lower surface of the thickened cap portion of the O-ring in each of the above-described embodiments to sandwich the cap portion therebetween. When the rocker cover is attached to the cylinder head, the small protrusions are pressed against the upper surface of the cylinder head to increase the surface pressure so that a uniform sealing surface pressure can be obtained over the entire circumference of the O-ring. It is also something that can be, also,
It goes without saying that the cylinder head in each of the above embodiments can be replaced with a rocker case as needed.

[0016]

In the fuel injection pipe introducing device according to the present invention, the fuel injection pipe is inserted into the shaft hole of the rubber cap by elastically opening and closing the slit provided in the rubber cap. By pressing the cap between the rocker cover and the cylinder head or the rocker case, the fuel injection pipe can be easily introduced from the outside into the rocker chamber, at which time the fuel injection pipe is divided in the middle, Since it is not necessary to connect both ends of them with a connector, the fuel injection pipe can be easily introduced even in a narrow space, and the versatility of the fuel injection pipe can be enhanced, which is very convenient in practice. .

[Brief description of drawings]

FIG. 1 is an exploded perspective view of an embodiment of the present invention.

FIG. 2 is an enlarged sectional view of the II-II assembly in FIG.

3 is an enlarged cross-sectional view of the III-III assembly of FIG.

FIG. 4 is a longitudinal sectional view of a main part in another embodiment of the present invention.

FIG. 5 is an enlarged vertical cross-sectional view of a conventional device.

[Explanation of Codes] 1 Fuel injection pipe 10 Rocker cover 11 Cylinder head 12 O-ring 13 Cap part 16 Central shaft hole 17 Slit 18 Recess 24 Stopper

─────────────────────────────────────────────────── ─── Continuation of the front page (51) Int.Cl. ⁶ Identification code Office reference number FI Technical display location F16M 1/026 F16M 1/026 G // F02M 37/00 321 F02M 37/00 321B

Claims (7)

[Claims] 1. A down recess formed in a rocker cover of an engine, and a rubber cap fitted in the recess and pressed between the rocker cover and a cylinder head or a rocker case. The rubber cap is a fuel injection pipe introducing device in which a shaft hole through which the fuel injection pipe is inserted is formed and a slit connecting the shaft hole and the outer peripheral surface is provided. 2. The fuel injection pipe introducing device according to claim 1, wherein the rubber cap is integrally formed with an O-ring. 3. The fuel injection pipe introducing device according to claim 1, wherein an inner surface of the recess is inclined in a circumferential direction of the rocker cover. 4. The fuel injection pipe introducing device according to claim 3, wherein the recess has a substantially semicircular or trapezoidal cross section. 5. The fuel injection pipe introducing device according to claim 1, wherein an inner surface shape of the recess is substantially the same as an outer peripheral surface shape of the rubber cap. 6. The rocker cover according to claim 1, wherein an outer peripheral surface of the rubber cap and / or a lower surface of the rubber cap contacting the cylinder head or the rocker case are arranged in a circumferential direction of the rocker cover. A fuel injection pipe introducing device having a small projection extending in the direction. 7. The fuel injection pipe introducing device according to claim 1, wherein an inner surface of the recess is inclined inward and outward of the rocker cover.