JP2607151Y2 - Assembly structure of gasket for fuel injection nozzle - Google Patents

Description

[Detailed description of the invention]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a structure for assembling a gasket for a fuel injection nozzle, and more particularly, to an interposition between a nozzle holder of a fuel injection nozzle of a diesel engine or the like and a hole for mounting the fuel injection nozzle of a cylinder head. The present invention relates to a structure for mounting a gasket.

[0002]

2. Description of the Related Art Conventionally, a fuel injection nozzle of an internal combustion engine such as a diesel engine has a nozzle holder inserted into a mounting hole formed in a cylinder head, and the nozzle holder is fixedly mounted on the cylinder head by a clamp member. (See Japanese Utility Model Application Laid-Open No. 58-30764).

Incidentally, the seal of the mounting hole of the cylinder head is formed by an annular stepped surface formed in the middle of the fuel injection nozzle mounting hole of the cylinder head and an annular stepped surface formed on the outer periphery of the nozzle holder. This is performed by an annular copper gasket interposed therebetween. Conventionally, the gasket is set on an annular stepped surface formed in the middle of the mounting hole before inserting the nozzle holder into the mounting hole. When the set gasket is inserted into the mounting hole of the nozzle holder, it is fitted around the nozzle holder and is interposed between the stepped surface and the annular stepped surface formed around the nozzle holder. Has become.

[0004]

However, in such a structure in which the gasket is set in advance on an annular stepped surface formed in the middle of the mounting hole, for example, the gasket is
For example , the gasket may not be properly seated on the stepped surface, such as being set to be inclined with respect to the surface, and may not fit around the nozzle holder when the nozzle holder is subsequently inserted into the mounting hole.

[0005] In particular, when the difference between the inner diameter of the mounting hole and the outer diameter of the gasket becomes large due to the error between the inner diameter of the mounting hole and the outer diameter of the gasket, the above-described gasket may not be properly seated on the stepped surface. Notably occurs. For this reason, conventionally, in the assembly line of the fuel injection nozzle, the posture of the gasket is corrected so that the gasket is properly seated on the stepped surface. However, there is a problem that workability is poor and productivity is poor.

In view of the above, the present invention has been made in view of the above, and has an annular step surface formed in the middle of a fuel injection nozzle mounting hole of a cylinder head and an annular step formed in an outer peripheral portion of a nozzle holder. An object of the present invention is to facilitate the work of assembling an annular gasket interposed between the surfaces.

[0007]

According to the present invention, a cylinder head is provided.
Ring made of a metal material which is easily plastically deformed and interposed between an annular stepped surface formed in the middle of the fuel injection nozzle mounting hole of the nozzle and an annular stepped surface formed on the outer periphery of the nozzle holder.
When projecting in a substantially circular shape on the upper side of the inner peripheral surface of the gasket
Both of them have flat end faces, and the inner peripheral surface of the gasket
At least three protrusions spaced at substantially equal intervals in the circumferential direction of the
And a gasket is fitted in advance on the outer peripheral surface of the nozzle holder and inserted into the mounting hole.

[0008]

In this configuration, the gasket is fitted to the outer peripheral surface of the nozzle holder in advance, and the gasket is brought into contact with the stepped surface of the nozzle holder. When the gasket is fitted, the projection on the inner peripheral surface of the gasket is pressed against the outer peripheral surface of the nozzle holder and collapsed, and the inner peripheral surface of the gasket fits the outer peripheral surface of the nozzle holder.

When the nozzle holder on which the gasket is set is inserted into the mounting hole of the cylinder head, the gasket sits on the stepped surface on the cylinder head side, and the step formed on the stepped surface and the periphery of the nozzle holder. It is interposed between the attachment surface. As described above, the gasket is fitted into the outer peripheral surface of the nozzle holder in advance and inserted into the mounting hole. As a result, the gasket is properly seated without being inclined with respect to the stepped surface.

When the nozzle holder on which the gasket is set is inserted into the mounting hole of the cylinder head, the inner peripheral surface of the gasket fits the outer peripheral surface of the nozzle holder, so that the gasket does not fall off from the nozzle holder. As in the case of press fitting
There is no difficulty in setting the gasket to the nozzle holder.

[0011]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of the present invention will be described below in detail with reference to the drawings. In FIG. 1, a fuel injection nozzle 1 of an internal combustion engine such as a diesel engine has a nozzle holder 2 inserted into a mounting hole 3a formed in a cylinder head 3, and
The nozzle holder 2 is fixedly attached to the cylinder head 3 by the clamp member 4.

In this case, the lower end of one side of the clamp member 4 is in contact with the cylinder head 3 and the lower end of the other side is in contact with the nozzle holder 2, and the bolt 5 is inserted into the bolt insertion hole 4 a in the middle of the clamp member 4. The nozzle holder 2 is fixed to the cylinder head 3 by the clamp member 4 by screwing the nozzle holder 2 into the cylinder head 3. Here, copper or the like interposed between an annular stepped surface 3A formed in the middle of the fuel injection nozzle mounting hole 3a of the cylinder head 3 and an annular stepped surface 2A formed in the outer peripheral portion of the nozzle holder 2. Plastic deformation
At least three protrusions 6A are integrally formed on the inner peripheral surface of the annular gasket 6 made of a metal material, which is easy to be separated, at substantially equal intervals in the circumferential direction.

In this case, as shown in FIG. 2, the projecting portions 6A are provided at three places separated by an angle of 120 degrees in the circumferential direction of the inner peripheral surface of the gasket 6, and the inner peripheral surface of the gasket 6 in the set state. Is formed to protrude in a circular shape on the upper side of the.
The tip end surface of the projection 6A is formed as a flat surface. The gasket 6 is formed by stamping with a press.

In the above configuration, the gasket 6 is assembled as follows. That is, the gasket 6 is fitted to the outer peripheral surface of the nozzle holder 2 in advance, and the gasket 6 is brought into contact with the stepped surface 2A of the nozzle holder 2. When the gasket 6 is fitted, the projection 6A on the inner peripheral surface of the gasket 6 is pressed against the outer peripheral surface of the nozzle holder 2 and collapses, and the inner peripheral surface of the gasket 6 fits the outer peripheral surface of the nozzle holder 2.

When the nozzle holder 2 on which the gasket 6 is set as described above is inserted into the mounting hole 3a of the cylinder head 3, the gasket 6 is moved to the stepped surface 3A on the cylinder head 3 side.
And is interposed between the stepped surface 3A and the stepped surface 2A formed on the outer peripheral surface of the nozzle holder 2. As described above, by fitting the gasket 6 in advance on the outer peripheral surface of the nozzle holder 2 and inserting the gasket 6 into the mounting hole 3a, the gasket 6 does not incline or the like with respect to the stepped surface 3A. To sit down.

When the nozzle holder 2 on which the gasket 6 is set is inserted into the mounting hole 3a of the cylinder head 3, the projection 6A is crushed as described above, and the inner peripheral surface of the gasket 6 fits the outer peripheral surface of the nozzle holder 2. Therefore, the gasket 6 does not fall out of the nozzle holder 2, and there is no difficulty in setting the gasket 6 on the nozzle holder 2 as in the case where the gasket 6 is pressed into the outer peripheral surface of the nozzle holder 2.

In particular, this configuration is more effective when the difference between the inner diameter of the mounting hole 3a and the outer diameter of the gasket 6 increases due to the error between the inner diameter of the mounting hole 3a and the outer diameter of the gasket 6. Further, unlike the conventional case, in the assembly line of the fuel injection nozzle, it is not necessary to modify the posture of the gasket so that the gasket is properly seated on the stepped surface. Good workability and excellent productivity.

In the above embodiment, the protrusion 6A
Are provided, but four, five,... May be provided. As described above, the present invention has been described with reference to the specific embodiment. However, the present invention is not limited to this, and a person skilled in the art is required to register a utility model attached to the present invention. It should be noted that various changes and modifications can be made without departing from the scope of the claims.

[0019]

[Effect of devised the present invention, as described above, cylinder
It is made of a metal material which is easily plastically deformed and interposed between an annular stepped surface formed in the middle of the fuel injection nozzle mounting hole of the head and an annular stepped surface formed on the outer periphery of the nozzle holder.
Protruding in a substantially circular shape on the upper side of the inner peripheral surface of the annular gasket
And the tip surface is formed on a flat surface,
At least three protrusions spaced at substantially equal intervals in the circumferential direction of the circumferential surface
The raised portion is provided integrally, and the gasket is fitted to the outer peripheral surface of the nozzle holder in advance and inserted into the mounting hole, so that the gasket properly seats on the stepped surface on the cylinder head side, and Since the inner peripheral surface of the gasket fits the outer peripheral surface of the nozzle holder, there is an advantage that the gasket does not fall off from the nozzle holder, and the work of setting the gasket on the nozzle holder is easy. In a line, the workability is good and the productivity is excellent and the practical effect is large.

[Brief description of the drawings]

FIG. 1 is a longitudinal sectional view showing an embodiment of an assembly structure of a gasket for a fuel injection nozzle according to the present invention.

FIG. 2 is a view showing a configuration of a gasket according to the embodiment;
(A) is a plan view, (B) is a cross-sectional view taken in the direction of arrow A in (A),
(C) is an enlarged view of part (B) in (A)

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Fuel injection nozzle 2 Nozzle holder 2A Stepped surface 3 Cylinder head 3A Stepped surface 3a Mounting hole 6 Gasket 6A Projection

──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Kokazu Fukushima 6-12 Hachiman, Kawashima-cho, Hiki-gun, Saitama Prefecture Inside Tokyo Gasket Industries Co., Ltd. (56) References Japanese Utility Model Hei 5-42671 (JP, U) Field surveyed (Int. Cl. ⁷ , DB name) F02M 61/14 310

Claims (1)

(57) [Scope of request for utility model registration] 1. A plastically deforming member interposed between an annular stepped surface formed in a fuel injection nozzle mounting hole of a cylinder head and an annular stepped surface formed in an outer peripheral portion of a nozzle holder.
Upper side of inner peripheral surface of annular gasket made of easy-to-use metal material
Formed on a flat surface with a substantially circular protruding end
Are separated at substantially equal intervals in the circumferential direction of the inner peripheral surface of the gasket.
A gasket assembly for a fuel injection nozzle, wherein at least three projections are integrally provided, and a gasket is fitted in advance on the outer peripheral surface of the nozzle holder and inserted into the mounting hole.