JPH08303326A - Fuel injection nozzle holder clamp - Google Patents

Abstract

PURPOSE: To provide a fuel injection nozzle holder clamp which reduces manufacturing cost, can be manufactured in a short time, and is light weight. CONSTITUTION: Aluminum alloy is extrusion molded and cut to a predetermined length to obtain an extruded hollow body. A hollow part which is extended along the direction of extrusion is formed in the thus obtained extruded hollow body. The hollow part corresponds to a through hole 12 of a bearing part 11. Moreover, longitudinal section of the extruded hollow body corresponds to longitudinal section of a fuel injection nozzle holder clamp 10. Next, the extruded hollow body is mechanically machined according to the normal method to form a fork part 13 and a fitting part 14. As a result, the fuel injection nozzle holder clamp 10 is obtained.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION The present invention relates to a fuel injection nozzle holder clamp for a diesel engine, for example.

[0002]

2. Description of the Related Art A fuel injection nozzle holder (hereinafter, also simply referred to as a nozzle holder) of a diesel engine is for fixing a nozzle to an engine cylinder. The nozzle holder is fixed to the engine body and the cam shaft. The nozzle holder and the cam shaft are fixed by a nozzle holder clamp.

Conventionally, in this fuel injection nozzle holder clamp, for example, cast iron such as FCD500 is cast into a shape close to a desired clamp, and then only a portion requiring high dimensional accuracy such as a connecting portion with a camshaft is machined. It is processed by processing.

[0004]

However, in the conventional manufacturing of the fuel injection nozzle holder clamp by casting,
In order to mass-produce the clamp, it is necessary to prepare a large number of molds having a complicated internal shape, which increases the manufacturing cost. In addition, it takes a long time to machine the connecting portion with the camshaft by machining. Further, since the casting product is inferior in molding accuracy to the extruded product, there are many machining margins, and it takes more time to process.

Further, since it is made of cast iron, it is heavy. In order to reduce the weight, measures such as reducing the wall thickness of the peripheral portion of the hole through which the camshaft is inserted are not sufficient. The present invention has been made in view of the above points, and provides a fuel injection nozzle holder clamp that is inexpensive in manufacturing cost, can be manufactured in a short time, and is lightweight.

[0006]

SUMMARY OF THE INVENTION The present invention is a fuel injection nozzle holder clamp for an engine having a bearing portion at one end of which a camshaft is fitted and a fork portion at the other end of which a fuel injection nozzle holder is engaged. Which is obtained by extrusion-molding aluminum or an aluminum alloy to obtain an extruded hollow body having a hollow portion extending along the extrusion direction, and then subjecting the extruded hollow body to machining to form the bifurcated portion. And a fuel injection nozzle holder clamp.

The fuel injection nozzle holder clamp may have a fitting hole into which a bolt for fixing to the engine body is fitted. In addition, the thickness of the peripheral portion of the through hole of the bearing may be uneven.

Further, the fuel injection nozzle holder clamp of the present invention is manufactured as follows. First, aluminum or an aluminum alloy is extrusion-molded to obtain an extruded hollow body having a hollow portion extending along the extrusion direction. In this extruded hollow body, the through hole of the bearing portion and the extruded cross section are simultaneously formed by extrusion molding. Next, by machining this extruded hollow body to form the shape of the fuel injection nozzle holder clamp and the fitting hole of the bolt other than the shape of the through hole of the bearing portion and the extruded cross section, the fuel injection nozzle holder clamp is can get. Therefore, it is not necessary to prepare many complicated and expensive molds like the fuel injection nozzle holder clamp obtained by casting. The shape of the through hole and the extrusion cross section of the bearing part requires machining depending on the precision of extrusion molding, but it requires less machining margin than the case of cast products, and the machining process is complicated. The number of steps and the time required can be reduced.

[0009]

The fuel injection nozzle holder clamp of the present invention is lightweight because it is made of aluminum or aluminum alloy. Further, after extruding aluminum or an aluminum alloy to obtain an extruded hollow body having a hollow portion extending along the extruding direction, the extruded hollow body is machined to form a bifurcated portion and a fitting hole if necessary. It is obtained by forming. Therefore, it is not necessary to prepare a large number of complicated molds as compared with the fuel injection nozzle holder clamp obtained by casting. Further, by extrusion molding, the shape of the cross section (hereinafter, extrusion cross section) and the hollow portion along the direction orthogonal to the extrusion direction of the fuel injection nozzle holder clamp are simultaneously formed. Therefore, although the through hole of the bearing portion and the shape of the extruded cross section need to be machined, the machining margin is smaller and the number of steps is smaller than that of a cast product. The thickness of the peripheral portion of the through hole of the bearing portion of the fuel injection nozzle holder clamp may be uneven. In this case, the fuel injection nozzle holder clamp becomes lighter.

[0010]

Embodiments of the present invention will be described below with reference to the drawings. The material used for the fuel injection nozzle holder clamp of the present invention is aluminum or aluminum alloy. An aluminum alloy that can be extruded is used. For example, Japanese Industrial Standard (JIS) 6061,6N0
1,6063,7N01 or 7003.

An example of the fuel injection nozzle holder clamp of the present invention is shown in FIG. Fuel injection nozzle holder clamp 10
Includes a bearing portion 11 having a through hole 12 into which a cam shaft is fitted, and a forked portion 13 into which the fuel injection nozzle holder is engaged, at the other end. Further, a fitting portion 14 into which a bolt for fixing the fuel injection nozzle holder clamp 10 is fitted to the engine body is formed.

FIG. 2 is a plan view of the fuel injection nozzle holder clamp 10 shown in FIG. The bifurcated portion 13 is formed with an arcuate cutout portion 22 into which the upper end portion 21a of the fuel injection nozzle holder 21 is inserted.

Further, the fitting portion 14 has a through hole 14a through which the shaft portion of the bolt penetrates, and a fitting groove portion 14b formed around the upper opening of the through hole 14a and into which the bolt head is fitted.
Have.

FIG. 3 is a vertical cross-sectional view of the fuel injection nozzle holder clamp 10 shown in FIG. 2 taken along the line AA in the drawing.
The thickness of the bearing portion 11 around the through hole 12 is knitted. That is, the center O of the through hole 12 having a diameter of 22 mm
Is knitted 1.5 mm vertically downward from the center O ′ of the contour of the bearing portion 11 having a diameter of 32 mm. Therefore, the upper wall thickness (6.5 mm) of the bearing 11 that requires mechanical strength is required.
mm) is thicker than the wall thickness (3.5 mm) below the bearing portion 11.

Hereinafter, the fuel injection nozzle holder clamp 10 will be described.
The production will be described. First, for example, aluminum alloy 6061 is extrusion-formed and treated with T6 by a conventional method, and then cut into a length of about 33.3 mm to obtain an extruded hollow body 41 as shown in FIG. In the obtained extruded hollow body 41, a hollow portion 42 extending along the extruding direction shown by the arrow A in FIG. 1 is formed. The hollow portion 42 corresponds to the through hole 12 of the bearing portion 11. The vertical cross-section of the extruded hollow body 41 has a fuel injection nozzle holder clamp 1 shown in FIG.
It corresponds to a vertical section of 0.

Next, the extruded hollow body 41 is machined according to a conventional method to form the forked portion 13 and the fitting portion 14.
More specifically, as shown in FIG. 2, in the bifurcated portion 13, the arcuate cutout portion 22 is formed, and both side surface portions 23a and 23b of the bifurcated portion 13 are shaved to avoid interference with other members. Provide an escape. Further, in the fitting portion 14, the through hole 14a and the fitting groove portion 14b described above are formed. As a result, the fuel injection nozzle holder clamp 10 is obtained.

As described above, the extruded hollow body 41 obtained by extruding an aluminum alloy has the hollow portion 42 and has a vertical cross section corresponding to the vertical cross section of the fuel injection nozzle holder clamp 10. Therefore, in the conventional manufacturing of the fuel injection nozzle holder clamp by casting, it is possible to simultaneously achieve the formation of the through hole 12 of the bearing portion 11 and the formation of the shape of the longitudinal section, which have to be all machined. Moreover, because the dimensional accuracy is better than in the case of casting, there is no need for machining, or it may be necessary depending on the accuracy of extrusion molding, but some machining is required at locations where high accuracy such as through holes is required. It requires less machining, so less machining is required than in casting. Therefore, the number of machining steps and the required time can be reduced. As a result, according to the method of the present embodiment, the time required for machining one piece can be reduced to about 70% as compared with the case where the fuel injection nozzle holder clamp is manufactured by casting the conventional FCD500.

A large number of hollow extruded bodies 41 can be obtained by extruding an aluminum alloy and cutting it. Therefore, it is not necessary to prepare many complicated molds as in the case of conventional casting. As a result, the manufacturing cost can be reduced.

Further, the fuel injection nozzle holder clamp 10
Is made of aluminum or aluminum alloy and is lightweight. Further, since the wall thickness around the through hole 12 of the bearing portion 11 is knitted, only the portion where mechanical strength is required has a wall thickness, so that further weight reduction is achieved.
As a result, the weight of the fuel injection nozzle holder clamp obtained by casting the conventional FCD500 was 120 g, whereas the weight of the fuel injection nozzle holder clamp 10 of the present embodiment was 65 g, which was about half the weight. I was able to

In this embodiment, the fuel injection nozzle holder clamp 10 is provided with the fitting portion 14 into which the bolt for fixing to the engine body is fitted, but the invention is not limited to this. Needless to say, the fitting portion 14 is unnecessary when fixing by welding or the like.

[0021]

As described above, according to the fuel injection nozzle holder clamp of the present invention, aluminum or aluminum alloy is extruded to obtain an extruded hollow body, and then the extruded hollow body is mechanically processed. It is lighter than that obtained by casting cast iron. Further, after extruding aluminum or an aluminum alloy to obtain an extruded hollow body, the extruded hollow body is machined to form a forked portion. Therefore, it is economical because there is no need to use a complicated and expensive mold. Further, since the shape of the extrusion cross section of the fuel injection nozzle holder clamp is formed by extrusion molding, the precision is better than the cast product and the dimensional accuracy is good, so there is no need or need for machining. Even in this case, since the machining allowance is smaller than that of the cast product, it is possible to reduce the number of machining steps to be performed later and the required time. As a result, the productivity of the fuel injection nozzle holder clamp is high, the manufacturing cost is low, and it is economical.

[Brief description of drawings]

FIG. 1 is a perspective view showing an example of a fuel injection nozzle holder clamp of the present invention.

FIG. 2 is a fuel injection nozzle holder clamp 10 shown in FIG.
Plan view of.

FIG. 3 is a fuel injection nozzle holder clamp 10 shown in FIG.
FIG. 8 is a vertical sectional view corresponding to line AA in FIG.

FIG. 4 is a perspective view showing an extruded hollow body obtained in the manufacturing process of the fuel injection nozzle holder clamp of the present invention.

[Explanation of symbols]

10 ... Fuel injection nozzle holder clamp, 11 ... Bearing part, 12 ... Through hole, 13 ... Bifurcated part, 14 ... Fitting part, 21
... Fuel injection nozzle holder, 41 ... Extruded hollow body, 42 ... Hollow part.

Claims (3)

[Claims] 1. A fuel injection nozzle holder clamp having a bearing portion to which a camshaft is fitted at one end and a forked portion to which a fuel injection nozzle holder is engaged at the other end, wherein aluminum or aluminum alloy is extruded. A fuel injection nozzle holder obtained by molding to obtain an extruded hollow body having a hollow portion extending along the extrusion direction, and then subjecting the extruded hollow body to machining to form the bifurcated portion. Clamp. 2. The fuel injection nozzle holder clamp according to claim 1, wherein a fitting hole into which a bolt for fixing to the engine body is fitted is formed. 3. The fuel injection nozzle holder clamp according to claim 1, wherein the thickness of the peripheral portion of the through hole of the bearing portion is uneven.