JPS5852373Y2 - Indexing device for fuel injection pumps in internal combustion engines - Google Patents

Description

[Detailed Description of the Invention] This invention relates to an indexing device for a fuel injection pump in an internal combustion engine, such as a diesel engine, equipped with a fuel injection pump.

As a conventional indexing device of this type, the first
As shown in the figure, an alignment mark 3 such as a score line is provided on the outer peripheral surface of a camp ring (timer) 2 fixed to the shaft end of the camshaft of the fuel injection pump, and a pointer 4 fixed to the outer wall of the pump 1 is provided with an alignment mark 3 such as a score line. A compulsion ring fixed to the shaft end of the pump drive shaft which rotates in synchronization with the 2-ink shaft is provided with a matching mark 5 similar to the above, and the fuel injection pump 1 is indexed with both marks 3 and 5 aligned. (not shown) and the camp ring 2 were coupled and fixed to adjust the injection timing of the pump.

For such timing cents, the indexing device of the engine is installed between large-diameter rotating parts and stationary parts, such as the flywheel and flywheel housing (clutch housing), so the indexing accuracy is high. Although it is possible, the above-mentioned Campling 2
has a small diameter, and a gap is formed between the compulsion ring 2 and the pointer 4 to prevent interference between the two, so the index accuracy of the fuel injection pump 1 is poor.

In addition, in recent years, various improvements have been made to reduce harmful components in exhaust gas, but as mentioned above, the index accuracy of fuel injection pumps is poor, and there are large variations in fuel injection timing. Even if various exhaust countermeasures were taken, sufficient effects could not be obtained.

This idea was made in view of the actual situation,
Although the configuration is extremely simple, the index accuracy of the fuel injection pump can be significantly increased.

This invention will be explained in detail below based on an embodiment shown in FIGS. 2 and 3.

In the figure, 1 is a fuel injection pump, 2 is a camp ring fixed to the end of the camshaft of the fuel injection pump 1, 3 is an alignment mark provided on the outer peripheral surface of the camp ring 2, and 4 is a camp ring of the fuel injection pump 1. A pointer 5 fixed to the outer wall is an alignment mark provided at the tip of the pointer 4 to face the alignment mark 3, and these operate in the same manner as in the prior art.

On the slope of the pointer 4 are the alignment marks 3 and 5.
A reflective surface 6 is provided which is inclined so as to project the images at the same time.

Therefore, even if a gap is formed between the alignment mark 3 provided on the camp ring 2 and the alignment mark 5 provided at the tip of the pointer 4, both marks 3 and 5 are not provided in the same plane. Even in such a case, the alignment marks 3.5 can be seen overlappingly through the reflective surface 6, so that the index accuracy of the fuel injection pump 1 can be improved.

Therefore, in an internal combustion engine equipped with such an indexing device, the timing of fuel injection can be adjusted with high precision.
The generation of harmful components in exhaust gas can be suppressed, and the effects of other exhaust countermeasures can be doubled.

In the embodiment, the reflective surface 6 is provided on the pointer 4, but it may be provided on other parts.

Further, it is needless to mention in detail that the reflective surface 6 can be formed of, for example, a reflective tape, glass, a mirror, or a mirror finish.

As explained above, according to the index device according to this invention, even if the camp ring has a small diameter and a gap is formed between the camp ring and the pointer, the indexing device provided on the camp ring can Since the mark and the alignment mark provided on the pointer can be seen overlappingly through the reflective surface, the fuel injection pump can be easily and accurately indexed, which is extremely advantageous when taking measures against exhaust emissions. .

[Brief explanation of drawings]

FIG. 1 is a perspective view of a main part showing an example of a conventional device, FIG. 2 is a perspective view of a main part showing an embodiment of this invention, and FIG. 3 is a sectional view of the same main part. 1... Fuel injection pump, 2... Camp ring, 3.5... Alignment mark, 4...
・Pointer 6... Reflective surface.

Claims (3)

[Scope of utility model registration request] (1) An alignment mark is provided on the outer circumferential surface of the camp ring of the fuel injection pump, which is connected to the pump drive shaft that rotates in synchronization with the crankshaft of the internal combustion engine, and an alignment mark is provided on the pointer fixed to the outer wall of the fuel injection pump. The fuel injection pump is indexed by aligning the alignment mark with the alignment mark of the pointer, and the alignment mark of the pointer is sandwiched between the alignment marks of the camp ring and the alignment mark of the camp ring is sandwiched between the alignment marks and the alignment mark of the camp ring is positioned so that the alignment marks are simultaneously projected. 1. An indexing device for a fuel injection pump in an internal combustion engine, characterized in that an inclined reflecting surface is provided on the indexing device. (2) The index device for a fuel injection pump in an internal combustion engine according to claim 1, wherein the compulsory ring is constituted by a timer. (3) The indexing device for a fuel injection pump in an internal combustion engine according to claim 1 or 2, wherein the reflecting surface is formed on two parts of a pointer.