JPH01178765A - Device operating by compression pressure and spraying thereinto - Google Patents

Abstract

PURPOSE:To make high pressure gas and liquid sprayable in and around a top dead center by installing a plunger being operated by compression pressure in facing on a combustion chamber. CONSTITUTION:In this device, there are provided with a plunger body 9 and a plunger 5 in facing on a combustion chamber 3. When a piston 1 enters its suction stroke, negative pressure is produced in this combustion chamber 3 and thereby the plunger 5 shifts in an arrow A direction. With this shifting, oil is fed under pressure to the inside of a hydraulic cylinder 16 via a plunger control shaft 4, while optional fuel is fed to the inside of a high pressure generating cylinder 6 via a needle valve 24. When the piston 2 is reached to a compression stroke top dead center, high pressure oil acts on the plunger 5 whereby it suddenly shifts in an arrow B direction. With this shifting, fuel in the high pressure generating cylinder 6 is sprayed to the combustion chamber 3 from a fuel injection groove 10 via a fuel injection hole 8 by way of a high pressure side fuel pressure-feed hole 7 and a needle valve 20.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention is a device for injecting high-pressure gas or liquid into a combustion chamber or cylinder into a combustion chamber or cylinder by arbitrarily controlling the actuation timing of a plunger using hydraulic pressure in a compression section near compression top dead center. In the cam structure, the plunger is thrust by the cam, and by rapidly opening and releasing the thrust, the plunger is actuated by the spring's repulsive force and compression pressure.This is a device that injects as described above.It is a conventional compression heat ignition type internal combustion engine fuel injection device. In the past, the pump was operated by internal combustion engine power and injected high-pressure fuel, but problems such as power consumption and pump manufacturing cost required improvement.In spark ignition internal combustion engines, pump manufacturing cost and vibration were disadvantageous, so it was necessary to inject high-pressure fuel before the pressure inside the cylinder increased. This caused the fuel temperature to rise before combustion started, causing knocking. Therefore, the above-mentioned drawbacks are eliminated and the features of the present invention are as follows: The end face of the plunger is provided in the part facing the combustion chamber, and the plunger is actuated by the negative pressure and compression pressure generated in the compression chamber.The plunger/cylinder compresses gas or liquid to a high degree. This is a device that injects fuel into the combustion chamber, etc. Examples will be explained in detail below based on the drawings. Figures 1 to 5 show the first embodiment, and Figure 2 is a sectional view of the cylinder head equipped with a fuel injection device. Figure 2 is a sectional view of the high pressure generating cylinder, which is composed of a plunger and a plunger body, before fuel is pumped under pressure. , 4th is a cross-sectional view of the plunger after fuel is pumped out. Figure 5 is a cross-sectional view of the hydraulic cylinder oil discharge groove provided on the surface of the plunger control shaft. It is. In the first embodiment shown in FIGS. 1 to 5, 1, cylinder 2, piston 3, combustion chamber 4, plunger control shaft 5, plunger 6, high pressure generating cylinder 7, high pressure side fuel injection hole 88 fuel injection hole 9, Pusenjapode 10
, injection grooves 11 and 12 provided on the outer periphery of the plunger, a hole 13 for sending oil to the hydraulic feed groove, a hydraulic feed groove 14 provided in the direction of rotation of the plunger control shaft, an oil drain groove 15 provided in the direction of rotation of the plunger control shaft, and oil discharge. Groove 16
, hydraulic cylinder 17, spring 18, adjustment screw 19, fuel supply port 20, needle valve 21, high pressure generation series lower surface 22, hydraulic pressure feed/discharge hole 23, plunger protrusion prevention part 24, needle valve. The operation of the first embodiment will be explained. A plunger 5 of the plunger body is provided in the part facing the combustion chamber 3. The plunger 5 has a needle valve 20, a needle valve spring 17, and an adjustment screw 18. The end is inserted into the oil cylinder 16 and the protrusion prevention part 23 of the plunger 5 is fixed. When the piston 2 enters the suction stroke, negative pressure is generated in the combustion chamber 3. The plunger 5 moves in the direction of arrow (A) and at the same time plunger control is performed. 4, the oil provided on the surface of the plunger control shaft 4 through the pressure feed holes 11 and 12, and the oil into the hydraulic cylinder 16 through the pressure feed groove 13 and the oil pressure feed discharge hole (22). Compression pressure is generated in the combustion chamber 3. At the stage when no fuel is generated, oil is trapped in the hydraulic cylinder 16 by the rotation of the control shaft 4, and arbitrary fuel is force-fed through the needle valve 24 to the high pressure generating cylinder 6 constituted by the plunger 5 and the plunger body 9, or by negative pressure inside the high pressure generating cylinder 6. Supply fuel. When the piston 2 reaches the top dead center of the compression stroke, the oil discharge groove (14) arbitrarily set in the rotational direction on the surface of the pressure feed shaft 4 reaches the hydraulic pressure feed discharge hole 22, and the oil in the hydraulic cylinder 16 is discharged from the oil discharge groove 15. The plunger 5 suddenly moves in the direction of arrow (B) due to the pressure in the combustion chamber. When the lower surface 21 of the high-pressure generating cylinder blocks the fuel supply port 19, fuel feeding starts and the fuel in the high-pressure generating cylinder 6 is transferred to the high-pressure side fuel feeding hole 7 and the needle. The valve 20 is connected to ■6th, 7th, 8th, and 6th, 7th, 8th, and
The second example shown in the figure will be explained by writing the same reference numerals where it has the same function as the first example. The difference between the second embodiment and the first embodiment is that the plunger 5
The spring 8 is compressed at 5 is the storage pressure in the combustion chamber 3,
It moves in the direction of arrow (B) due to the repulsive force of the spring 8, and a diagonal cut portion 16 is provided in the high pressure generating cylinder 6, which is composed of the plunger 5 and the plunger body 9, and a groove 1 is formed on the outer periphery of the plunger 5.
4 and a control rack 13 that engages with this is provided, and the control rack 13 is engaged with this by moving from side to side by operating a lever or cabana. The injection amount is adjusted by rotating the plunger 5 arbitrarily to change the effective stroke. 15 is a fuel paste turn hole. In the first embodiment, a high pressure generation space is created in which the plunger moves due to the pressure of oil to the hydraulic cylinder and pressure during the suction stroke, and the required amount of fuel is supplied through the needle valve, and the required amount of fuel is supplied to the hydraulic cylinder. By arbitrarily opening and releasing the oil in the hydraulic cylinder near the top dead center of the compression stroke while the internal oil is confined, the plunger generates high pressure while discharging the oil in the hydraulic cylinder by compression pressure.From the moment the bottom of the cylinder blocks the fuel supply port. Fuel is started under pressure. Fuel is injected from the fuel injection hole via the needle valve into a fine atomized form without causing a dripping phenomenon through the minute clearance provided between the inner diameter of the plunger body and a portion of the outer diameter of the plunger. , a device that combines an injection pump and an injection nozzle, and the present invention is a device that combines an injection pump and an injection nozzle, and when a gas or liquid substance is pumped from the outside into the compression storage chamber of a compression ignition type or spark ignition type internal combustion engine, the storage chamber and plunger are used. A pressure cutoff valve is installed in between to pressurize the plunger. By repeatedly releasing and releasing pressure, pressure feeding can be achieved without the need for a large-scale high-pressure generator. In the second embodiment, the plunger is pushed by the rotation of the cam, and the fuel is pumped into the high pressure generation space. Near the top dead center of the compression stroke, the thrust by the cam is suddenly released. The plunger is moved by the compression pressure and the repulsive force of the spring. High pressure cylinder By moving the control rack during injection, the plunger that fits into the control rack rotates, changing the effective stroke of the high pressure generating cylinder and controlling the fuel injection amount.The required amount of fuel is delivered from the injection port. do. Brief Description of the Drawings Figures 1.2.3.4.5 are sectional views showing the first embodiment and showing a fuel injection device installed in a cylinder head. Figure 2 is a cross-sectional view of the high pressure generating cylinder before pumping fuel. Figure 3 is a cross-sectional view of the fuel pressure bag, and Figure 4 is the drain groove for the oil in the hydraulic cylinder. Figure 5 is a cross-sectional view of the oil pumping hole and the oil pumping groove. Section 6.7.8. The figure is
The second embodiment is shown, and FIG. 6 is a sectional view of the second embodiment. Figure 7 is a cross-sectional view of the plunger during its effective stroke. Figure 8 is a cross-sectional view of the plunger when fuel is not being pumped. Explanation of major transcriptions 5. Plunger 6. High pressure generating cylinder9. plunger body

Claims (1)

[Claims] A device for injecting into the combustion chamber by using a plunger that is capable of injecting near the top dead center by compression pressure, and having the end face facing the combustion chamber.