JPH0248690Y2 - - Google Patents

Description

[Detailed Description of the Invention] This invention relates to an in-line fuel injection pump that mixes two types of fuel and injects and supplies the mixture to a compression ignition engine.

In recent years, air pollution caused by exhaust from automobile engines has become a social problem, and since petroleum resources are limited, various studies have been conducted for low-pollution combustion and low fuel consumption.

Also in compression ignition engines, a method has been proposed in which alcohol is mixed with light oil and burned in order to achieve low-pollution combustion. In this case, light oil is the main fuel and alcohol is an auxiliary fuel, and there are two methods: one is to mix alcohol directly with light oil, and the other is to separately inhale alcohol or inject it into the cylinder.

In the former, the mixing ratio of light oil and alcohol is constant with respect to engine speed and load, and in the latter, the fuel injection system is complicated. And, to be more specific about the latter, patent no.
No. 171803 discloses a "fuel injection pump" and Japanese Utility Model Application Publication No. 57-31566 discloses a "fuel injection device."

They have a structure in which two types of fuel are compressed separately, and the two compressed fuels are mixed and injected into the cylinder just before flowing into the injection pipe, so the sleeve, barrel, and plunger are complex and large. This resulted in the need for multiple delivery valves, resulting in an increase in the overall size of the pump and a significant change in the pump structure.

The purpose and problem of this invention was to avoid making major changes to the pump structure and complicating and increasing the size of the fuel injection system, and to mix two types of fuel and inject and supply it to a compression ignition engine. To provide an in-line fuel injection pump that supplies the remaining injection of mixed fuel to the next plunger chamber to enable low-pollution combustion and reduce consumption of petroleum-based fuel as a measure against depletion of petroleum resources. .

In connection with the above-mentioned objects and problems, the in-line fuel injection pump of this invention includes a housing in which a plurality of barrel bores are formed at appropriate intervals, and a housing in which openings are formed in the barrel bores. a main fuel sump chamber spaced apart from the main fuel sump chamber, and an auxiliary fuel sump chamber formed in the housing opening into the barrel bore spaced apart from the main fuel sump chamber; These barrels are located below from the auxiliary fuel storage chamber.
A mixed fuel reservoir opening in the bore and formed in the housing, and a main fuel suction port, an auxiliary fuel suction port, and a mixed fuel port correspondingly opening to the main, auxiliary, and mixed fuel reservoir chambers. and a plurality of sleeve barrels fitted into the barrel bores, a plurality of sleeve barrels fitted in the sleeve barrels so as to be reciprocally slidable to form a plunger chamber within the sleeve barrels, and one end are in touch with each other, and
A main diagonal notch groove and an auxiliary horizontal notch spaced apart from each other and cut into the outer circumferential surface so that the other end is connected to the mixed fuel port as the other end is slid back and forth into the sleeve barrel. a plurality of plungers each having a groove and a relief hole having one end opened in the top surface and the other end opened in one of the main diagonal and auxiliary horizontal notch grooves, and reciprocating the plungers into the sleeve/barrel; A camshaft with multiple sliding cams and its sleeve.
a pinion and a control rack for rotating the plunger in the barrel;
The plunger chamber mixes and compresses different types of fuel, allows the compressed mixed fuel to be pumped to the injection nozzle, and allows the remainder of the mixed fuel to be supplied to the next plunger chamber.

Hereinafter, preferred specific examples of the in-line fuel injection pump according to the invention will be described with reference to the drawings.

1 to 4 partially show a specific example 10 of the in-line fuel injection pump of this invention applied to a compression ignition engine for a truck.

The in-line fuel injection pump 10 mixes auxiliary fuel alcohol with the main fuel light oil according to the rotation speed, load, etc. of the compression ignition engine, and injects the mixture into the cylinder chamber of the engine from the injection nozzle.
Consisting of six injection pumps, six barrel bores 12 formed in a housing 11.
Fit the sleeve and barrel 13 inside, respectively.
Also, each sleeve/barrel 13 has a plunger 14.
is fitted so that it can slide back and forth.

That is, this row type fuel injection pump 10 has 6
The housing 11 has barrel bores 12 formed at predetermined intervals, a main fuel reservoir 15 opened to the barrel bores 12 and formed in the housing 11, and a main fuel reservoir 15 facing away from the main fuel reservoir 15. an auxiliary fuel sump chamber 16 formed in its housing 11 and opening into the barrel bores 12 apart, and its main and auxiliary fuel sump chambers 15;
a mixed fuel sump chamber 17 formed in the housing 11 spaced apart from and below the auxiliary fuel sump chamber 16 and open into the barrel bores 12; and its main, auxiliary, and mixed fuel sump chambers. six sleeve barrels fitted into the barrel bores 12 with a main fuel inlet port 20, an auxiliary fuel inlet port 21, and a mixed fuel port 22 opening correspondingly to chambers 15, 16, and 17; 13 and its sleeve/barrel 1
3 are reciprocally slidably fitted to form a plunger chamber within the sleeve barrel 13, and one end is in communication with each other and the other end is reciprocally slidable within the sleeve barrel 13. A main diagonal notch groove 28 and an auxiliary horizontal notch groove 29 are spaced apart from each other and cut out in the outer circumferential surface so as to communicate with the mixed fuel port 22 accordingly, and one end is in the top surface and the other end is notched. are provided with relief holes 27 opened in the auxiliary horizontal notch grooves 29, respectively.
A camshaft (not shown) comprising six plungers 14 and six cams (not shown) for reciprocating the sleeve/barrel 13 of the plunger 14
The sleeve-barrel 13 included a pinion 24 and a control rack 25 for rotating the plunger 14, and six delivery valves 30.

The housing 11 has, in its upper part,
A main fuel reservoir 15, an auxiliary fuel reservoir 16, and a mixed fuel reservoir 17 are formed in the barrel bore 12, and the main fuel reservoir 15 is connected to the main fuel port 18 in an auxiliary fuel reservoir. The fuel reservoir chambers 16 communicate with auxiliary fuel ports 19, respectively. In particular, the mixed fuel reservoir chamber 17 has 6
sleeve/barrel 13, that is, the barrel/barrel
It is formed in the housing 11 so as to span the bore 12 .

In the upper part of the sleeve barrel 13,
forming its main and auxiliary fuel suction ports 20, 21 and a mixed fuel port 22, with its main fuel suction port 20 in its main fuel sump chamber 15 and its auxiliary fuel suction port 21 in its auxiliary fuel sump chamber 16; , furthermore, its mixed fuel port 2
2 are communicated with the mixed fuel reservoir chamber 17, respectively. This mixed fuel port 22 is also connected to its sleeve for the cylinder chamber to be combusted next.
In the plunger chamber of the barrel 13, the remaining mixed fuel to be injected is released into the mixed fuel reservoir chamber 17.

The sleeve barrel 13 has a sleeve 23 fitted on the outside of the lower part, a pinion 24 integrally formed at the upper end of the sleeve 23, and a pinion 24 formed integrally with the upper end of the sleeve 23.
4 is engaged with its control rack 25.

The sleeve 23 also has a pair of slots (not shown) formed at its lower end into which a collar (not shown) at the lower end of the plunger 14 is fitted, and the control rack 25 allows Rotating the plunger 14 itself around its axis,
The injection amount of the mixed fuel is adjusted.

The plunger 14 is reciprocally slidably fitted in the sleeve barrel 13 so as to form a plunger chamber within the sleeve barrel 13, and is connected by a cam of the camshaft to a tappet (not shown). ) through its sleeve barrel 13
It is slid back and forth in the vertical direction.

The plunger 14 also has a fuel lead 2.
6 is cut out in its outer peripheral surface on the top surface side, and of course, this fuel lead 26 is connected to the relief hole 27 opened in the top surface that partitions the plunger chamber.
Contains. In particular, the relief hole 27 was formed as a vertical hole.

Therefore, the light oil and alcohol supplied to the plunger chamber of the sleeve barrel 13 and the mixture of the light oil and alcohol are mixed in the plunger chamber, and as the plunger 14 reciprocates, the delivery... The valve 30 is pushed open, and the fuel is pumped through the injection pipe 34 to an injection nozzle (not shown). Also, this plunger 14
is pushed down by the push-down spring 31,
The roller of the tappet is pressed against the cam surface of the cam and cooperates with the cam to push the plunger 14.
It gives reciprocating motion of pushing up and pulling back.

The other end of the fuel lead 26 is connected to the mixed fuel port 22 during the fuel spill process of the plunger 14, as can be seen from FIGS.
The main diagonal notch groove 28 is connected to the main diagonal notch groove 28, the auxiliary horizontal notch groove 29 whose other end is connected to the mixed fuel port 22 during the fuel suction process of the plunger 14, and the relief hole 27. , the ends of the main diagonal notch groove 28 and the auxiliary horizontal notch groove 29 are also connected to each other by a vertical groove.

As such, this fuel lead 26 consisting of the main diagonal notch groove 28, the auxiliary horizontal notch groove 29, the relief hole 27, and the vertical groove is connected to the plunger 14.
In the fuel spill process, the remaining injection of the mixed fuel is released from the plunger chamber to the mixed fuel reservoir chamber 17 through the relief hole 27, the longitudinal groove, and the main diagonal notch groove 28, and the mixed fuel reservoir chamber 17 to the next cylinder chamber to be combusted, and in the fuel intake process of the plunger 14, the mixed fuel passes through the auxiliary horizontal notch 29 and the relief hole 27. The mixed fuel is led from the reservoir chamber 17 to the plunger chamber.

The main and auxiliary fuel ports 18, 19 formed in the housing 11 are also connected to main and auxiliary fuel feed pumps (not shown) via main and auxiliary fuel feed pipes 32, 33, respectively; The main fuel port 18 is supplied with light oil from a main fuel tank (not shown) by the main fuel feed pump, and the auxiliary fuel port 19 is supplied with light oil from the main fuel tank (not shown) by the auxiliary fuel feed pump. Alcohol is then supplied from an auxiliary fuel tank (not shown). Of course, the main and auxiliary fuel feed pipes 32, 33 are each provided with a fuel filter (not shown).

Next, the operation of the in-line fuel injection pump 10 constructed as described above will be described. When the engine is running, the camshaft is rotated by the engine, and the main and auxiliary fuel feeds are rotated by the engine.
Since the pumps are each driven by their engines, with the rotation of their camshafts, their plungers 14 are moved up in their sleeve barrels 13 via their cams and tappets, and their main and auxiliary Light oil and alcohol flowing into the plunger chamber from the main and auxiliary fuel reservoir chambers 15, 16 through the fuel suction ports 20, 21 are compressed by the plunger 14,
The mixed and compressed high pressure fuel mixture opens the delivery valve 30 and enters the fuel injection pipe 34.
It flows through the injection nozzle and is injected from the injection nozzle's nozzle hole into the cylinder chamber of the engine, where it is combusted.

More specifically, when the plunger 14 is lowered into the sleeve barrel 13 and placed in the fuel intake stroke shown in FIG. , the auxiliary horizontal cutout groove 29 and the relief hole 27 from the mixed fuel sump chamber 17 to the plunger chamber, and at the same time, the light oil passes through the main fuel suction port 20 to the main fuel sump chamber. Alcohol is conducted from the auxiliary fuel sump chamber 15 to the plunger chamber via the auxiliary fuel intake port 21 and from the auxiliary fuel sump chamber 16 to the plunger chamber, respectively.

Next, the plunger 14 is connected to the sleeve.
Once raised into the barrel 13, its main fuel intake port 20, auxiliary fuel intake port 21, and mixed fuel port 22 are closed with its plunger 14 and placed in the fuel pumping stage shown in FIG. The light oil, alcohol, and the remaining injection fuel mixture led to the plunger chamber are compressed and mixed by the plunger 14, and the compressed high-pressure mixed fuel is delivered to the delivery valve 30.
The fuel then opens, flows through the fuel injection pipe 34 to the injection nozzle, is injected from the nozzle hole of the injection nozzle into the cylinder chamber of the engine, and is combusted there.

Subsequently, the plunger 14 is moved up into the sleeve barrel 13 so that the main diagonal groove 28 communicates with the mixed fuel port 22;
When placed in the fuel spill process shown in FIG.
The remaining injection of the mixed fuel is carried out through the relief hole 27, vertical groove,
Main diagonal notch groove 28 and mixed fuel port 2
2 and then escapes from the plunger chamber to the mixed fuel reservoir chamber 17.

Then, such a mixed fuel injection operation is sequentially performed in each of the six injection pumps.

As a result, this engine generates a predetermined output, consumes less diesel oil, and contains fewer harmful components in exhaust gas.
Improved smoke and knock.

As understood from the above, the in-line fuel injection pump of this invention includes a housing in which a plurality of barrel bores are formed at appropriate intervals, and openings in the barrel bores are formed in the housing. a main fuel sump chamber, an auxiliary fuel sump chamber formed in the housing spaced apart from the main fuel sump chamber and opening into the barrel bore; a mixed fuel sump chamber located downwardly from the sump chamber and open to the barrel bores formed in the housing; and a main fuel intake correspondingly opened to the main, auxiliary, and mixed fuel sump chambers. a plurality of sleeve barrels each having a port, an auxiliary fuel intake port, and a mixed fuel port and fitted into the barrel bores; and are spaced apart from each other such that one end is in communication with each other and the other end is in communication with the mixed fuel port upon sliding reciprocation within the sleeve barrel. A main diagonal notch groove and an auxiliary horizontal notch groove are cut out in the outer peripheral surface, and one end is opened in the top surface and the other end is opened in either the main diagonal notch groove or the auxiliary horizontal notch groove. It includes a plurality of plungers having relief holes, a camshaft having a plurality of cams for reciprocating the plungers in the sleeve/barrel, and a pinion and a control rack for rotating the plungers in the sleeve/barrel. In the in-line fuel injection pump of that invention, a small amount of mixed fuel remains injected from the plunger chamber to the mixed fuel reservoir chamber through the relief hole, main diagonal notch groove, and
The mixed fuel is returned via the mixed fuel port and can be supplied from the mixed fuel reservoir chamber to the plunger chamber of the sleeve barrel of the next injection operation, avoiding returning the mixed fuel to the fuel tank as the remainder of the injection. In addition, the complexity and size of the sleeve, barrel, and plunger are suppressed, and the size of the pump as a whole is suppressed.
The fuel injection pump is manufactured using conventional machining and assembly operations are performed in a conventional manner, which means that the fuel injection pump can be manufactured without major design changes and dual fuel injection is possible. It can be realized at a low cost, and as a result, measures can be taken to deplete oil resources.Furthermore, with the mixed injection of two types of fuel, low-pollution combustion becomes possible, and harmful components contained in exhaust gas are reduced. , smoke and knock are improved.

[Brief explanation of the drawing]

Fig. 1 is a partial vertical sectional view of the in-line fuel injection pump of this invention applied to a compression ignition engine of a truck, and Fig. 2 is a partial longitudinal sectional view of the in-line fuel injection pump of Fig. 1 during the fuel intake process. , FIG. 3 is a partial longitudinal cross-sectional view of the column-type fuel injection pump of FIG. 1 in the fuel pumping process, and FIG. 4 is a partial vertical cross-section of the column-type fuel injection pump of FIG. 1 in the fuel spill process. It is. 11...housing, 12...barrel/bore,
13...Sleeve/barrel, 14...Plunger, 15...Main fuel reservoir, 16...Auxiliary fuel reservoir, 17...Mixed fuel reservoir, 18...Main fuel port, 19...Auxiliary fuel port, 20... Main fuel suction port, 21... Auxiliary fuel suction port, 22... Mixed fuel port, 26... Fuel lead, 27... Relief hole, 28... Main diagonal notch groove,
29...Auxiliary horizontal notch groove.

Claims (1)

[Claims for Utility Model Registration] A housing in which a plurality of barrel bores are formed at appropriate intervals, a main fuel reservoir chamber opened in the barrel bores and formed in the housing, and the main fuel reservoir. an auxiliary fuel sump chamber formed in the housing and opening into the barrel bores spaced apart from the main and auxiliary fuel sump chambers;
a mixing fuel sump chamber formed in the housing located downwardly from the auxiliary fuel sump chamber and opening into the barrel bore; and correspondingly openings to the main, auxiliary, and mixed fuel sump chambers. It has a main fuel suction port, an auxiliary fuel suction port, and a mixed fuel port, and has a plurality of sleeve barrels fitted into the barrel bores thereof, and a plurality of sleeve barrels fitted in the sleeve barrels so as to be reciprocally slidable. forming a plunger chamber within the sleeve barrel and having one end in communication with each other and the other end in communication with the mixed fuel port upon sliding reciprocation within the sleeve barrel. A main diagonal notch groove and an auxiliary horizontal notch groove that are spaced apart and cut out on the outer circumferential surface, and one end is opened in the top surface and the other end is opened in either the main diagonal notch groove or the auxiliary horizontal notch groove, respectively. a camshaft having a plurality of cams for reciprocating the plungers into the sleeve and barrel; a pinion and a control rack for rotating the plunger in the sleeve and barrel; Including column type fuel injection pump.