JPS5835262A - Automatically rotated injection port for fuel injection valve of diesel engine - Google Patents

Abstract

PURPOSE:To increase output and improve fuel erficiency, by providing the needle valve element of a fuel injection valve with an injection port having such a direction that the needle valve element is rotated by the reaction force of injection and by automatically rotating the valve element under the reaction force to mix fuel and air well with each other to shorten the period of ignition lag. CONSTITUTION:The main stream of high-pressure fuel in an injection valve proceeds through an oil passage 2, an oil chamber 4, a needle valve seat, an annular groove 15 just under the seat, an oil hole 5 and a spiral groove 12 in a valve shank 6 and is injected from an injection port 7 so that the stream is oriented to the peripheral part of a combustion chamber. The preceding auxiliary stream of the fuel proceeds from the peripheral surface of the valve shank 6 and passes through the oblique groove 17 of the peripheral surface of a collar 16 for the valve shank and is injected into the central part of the combustion chamber while exerting torque on a needle valve element, to cause previous ignition. At that time, the auxiliary stream of the fuel also lubricates the collar 16, prevents the combustion gas in the cylinder from invading into the injection valve and washes clinging soot away. Since the size of the injection port 7 is nearly proportional to that of the cylinder, the injection valve can be simplified for an engine of medium or small size by providing only the auxiliary stream line but dispensing with a hole in the needle valve element.

Description

[Detailed Description of the Invention] In current general direct injection engines, the fuel injection direction is fixed, and there is a large deviation in the density of the mixture with the compressed air in the fuel chamber, so in order to completely burn the injected fuel, The amount of air required is several times greater than the theoretical amount, the ignition delay period is extended, the maximum combustion pressure is increased, and the impact on engine strength is also large. For these adjustments, an air swirling method is adopted and is effective, but in order to apply swirling force to a large amount of air, air supply resistance increases and the effective air volume inevitably decreases.

Therefore, this invention improves the mixing of the compressed air and the injected fuel by automatically rotating the nozzle in order to diffuse and distribute the very small amount of injected fuel into the combustion chamber air. The aim is to reduce the ignition delay period to increase the maximum pressure, improve the utilization of air supply, increase output, and reduce the fuel consumption rate at the same maximum pressure.

To explain the drawings below, fuel oil is force-fed to the fuel injection pump, enters the oil chamber 4 at the bottom of the fuel needle valve 8 through the oil passage 2 in the valve operation guide fitting 1, and closes the needle valve due to the difference in diameter between the top and bottom of the needle valve. The valve opens against a spring (not shown due to common knowledge),
The inner hole 8 of the valve leg 6 is connected to the oil hole 5 which opens into the annular groove 15 on the valve.
It is then injected from the injection lower into the cylinder. The spout is the second
As shown in the figure, since it is tangential to the inside of the needle valve inner hole 8, a rotational force is generated in the valve at the same time as the injection. In order to reduce the oil passage volume after the valve, a thin rod 9 is inserted into the inner hole of the needle valve, and its upper part 10 is precision welded to form the upper part of the needle valve, and its upper end 11 is pressed by a push rod 28 to close the valve. It shall be subject to pressure.

The lower end of the thin rod 9 extends close to the nozzle to narrow the space, and the part below the valve seat is provided with several torsion grooves 12 that guide the pressure oil entering from the oil hole 5 to the nozzle. A rotational force is generated in the thin rod to help rotate the needle valve.

A mini rolling bearing 18 is placed in the upper part of the needle valve to help rotate the needle valve. The lifting height of the needle valve is limited by a regulating ring 14.

In this way, the main flow of high-pressure fuel oil flows through the oil passage 2 and the oil chamber 4.
The oil is injected from the injection lower from the needle valve seat and the annular groove 15 directly below it through the oil hole 5 and the torsion groove 12 in the valve leg 6, but as a side stream it becomes a cylindrical oil film thinner than the outer periphery of the valve leg 6 and reaches the cylinder. In some cases, a so-called bottle-type injection valve is integrated.

In this case, the fuel passing through the bottle depends on the thickness of the oil film formed by the annular collar of the pintle portion of the valve leg 6.

Symbol numbers 20 and after are parts similar to conventional fuel injection valves, such as an injection valve body 20, a nut 21 for attaching to the body, an alignment knock 22, a valve push rod 28, and a valve seat cooling water hole 24.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 shows a vertical cross-section of the main parts of a fuel injection valve, provides an overview of an actual fuel injection valve, and shows its relationship to the present invention. Applicant: Kozo Yamane■1 Kari procedure amendment (method) February 22, 1995 1 '1! F4'rql shown in 1988-Bamboo t'
fa 'tA33 δ1t-o+2 4' 4 names
Chiozorose 1η shellfish 5. White with % off injection! h rotation inlet 1
1 Mouth 3 Correct sleeves 6 Elderly matter I cow Hi's N↓Q, 'It's a word of departure and wrinkles A, I's master/place Email LfK and place of residence, electrician, senri, night, two hg4y5
Name Σt'子d□ ztoiNōrime, 5,. 1llt Shoseimei Cold Patrol Date 10/10/1981 (
2nd Takeshi Tsukasa in 1981? (January 28, 2018)
g4 hit 0. p-245-6, Kashin'sho's hexagram 1 East Kutsuzuki Nenda 1 Orbi Dan 17 Ho 1L contents, the part below the valve seat has the number that guides the pressure oil entering from oil hole 5 to the spout. A threaded torsion groove 12 is provided, and as it passes, a rotational force is generated in the thin rod to help rotate the needle valve. A mini rolling bearing 18 is placed in the upper part of the needle valve to help rotate the needle valve. The lifting height of the needle valve is limited by a regulating ring 14. The outer circumference of the lower part of the valve leg 6 is narrower than the corresponding inner hole of the actuation guide fitting l and forms an oil passage, and a rotatable collar 16 of the same diameter is attached near the tip of the valve leg 6 so as to be inclined in the same direction as the jet 117. The groove 17 is narrowed to the middle (opening position) of the jet 1.1'/.In this way, the main flow of high-pressure fuel oil flows through the oil passage 2, oil chamber 4,
The needle valve seat and the ring directly below it #! The oil is injected from the injection lower through the oil hole 15 through the twist/12 in the valve leg 6, aiming at the outer periphery of the combustion chamber, and is directed from the outer periphery of the valve leg 6 to the surface of the collar 16 as a secondary stream. It passes through the groove 17 and is injected into the center of the combustion chamber while generating rotational force in the needle valve, aiming at advance ignition. At the same time, it also lubricates a portion of the valve, prevents combustion gas from entering the valve, and washes away adhering soot. Since the size of the injection nozzle is approximately proportional to the size of the cylinder, medium and small engines can use only this side flow type and omit the inner hole of the needle valve body, making the valve body structure simple and still retaining the rotation system. obtain. Symbol numbers 20 and subsequent parts are parts similar to conventional fuel injection valves, such as an injection valve body 20, a nut 21 for attaching to the body, an alignment knock 22, a valve push rod 23, and a valve seat cooling water hole C. 4 Brief Description of the Drawings Figure 1 shows a vertical cross-section of the main parts of a fuel injection valve, where the solid line indicates the invention, and the thin two-dot line outlines the current general fuel injection valve, and shows the invention. Indicates the relationship between Fig. 2 is a plan view of the lower surface, showing that the nozzle is tangentially bored into the inner hole, and Fig. 8 is a plan view of the valve seat cut away. FIG. 4 is an elevational view of the tip of the valve leg, showing a portion of the collar and a diagonal groove on its outer circumferential surface.

Claims (1)

[Claims] The valve body and nozzle of a diesel engine fuel injection valve are integrated, and the injection reaction force is opened in a direction that creates a couple with respect to the center line of the valve body, and the injected fuel is automatically rotated into the combustion chamber by injection. A method to improve miscibility with the air by spraying it into high-temperature compressed air.