JPS6270655A - Fuel jet valve electromagnetically operated - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to an electromagnetically operated fuel injection valve for a fuel injection system of an internal combustion engine, which is surrounded by a valve caning made of a ferromagnetic material and an electromagnetic coil. and a cylindrical mover cooperating with the iron core, the mover is immovably coupled to the needle valve, and when the electromagnetic coil is energized, the needle valve , a stopper shoulder facing the iron core is adapted to abut against a stopper plate fixed between the valve casing and the nozzle body guiding the needle valve, and the stopper shoulder facing the iron core abuts against a stopper plate fixed between the valve casing and the nozzle body that guides the needle valve. The plate has, in addition to the flow hole for receiving the cylindrical part of the needle valve, a cutout groove which has a gap width larger than the diameter of the cylindrical part of the needle valve. and extending radially from the flow hole to the outer edge of the stopper plate.

Conventional technology When the electromagnetic coil is in an energized state, the mover does not come into direct contact with the soft magnetic core, but a stopper shoulder formed on a needle valve that is immovably connected to the mover is fixed to the casing. Fuel injection valves of the type that impinge on a stopper are known. DE 2905099 A1 discloses that the stop fastened to the housing is designed as a stop plate. Therefore, even when the electromagnetic coil is in an excited state, a gap remains between the mover and the iron core, and magnetic adhesion between the mover and the iron core caused by residual magnetic action is avoided. However, after switching off the electromagnetic coil, adhesive forces act between the stopper shoulder and the stopper plate, resulting in a delay in the separation of the stopper shoulder from the stopper plate. This adhesion makes the fuel metering of the fuel injection valve inaccurate.

SUMMARY OF THE INVENTION An object of the present invention is to improve a known electromagnetically operated fuel injection valve in such a way that the adhesion force between the stopper shoulder and the stopper plate 7 can be reduced so that more accurate fuel metering can be carried out. It is in.

Means for Solving the Problems In order to solve the above-mentioned problems, in the present invention, the circumferential surface of the flow hole of the stopper plate has at least one notch or other part.
It appears to be interrupted by two notches.

Effects of the Invention In the fuel injection valve of the present invention, the stopper plate has a special configuration, that is, the circumferential surface of the flow hole of the stopper plate is interrupted by at least one cutout or the like, so that the stopper plate can be closed. The advantage is that sticking between the zero rate and the stop shoulder is largely avoided.

Advantageous embodiments and improvements of the fuel injection valve according to the invention are possible by means of the measures described in the subclaims.

Embodiment A fuel injection valve for a fuel injection device for a mixture compression spark ignition internal combustion engine, which is shown as an embodiment in FIG. 1, has a valve casing 1 made of a ferromagnetic material. An electromagnetic coil 3 is disposed on a coil support 2 inside.

The electromagnetic coil 3 is supplied with electrical current via a plug connection 4 that is embedded in a plastic ring 5 that partially surrounds the valve housing 1 .

The coil support 2 of the electromagnetic coil 3 is located in the coil chamber 6 of the valve housing 1 on a connecting piece 7 which is supplied with a fuel, for example gasoline, and which partially covers the valve. It has entered casing 1. The valve housing 1 partially surrounds the nozzle body 9 on the side opposite the connecting tube piece 7 .

The cylindrical shape of the fuel injection valve is located between the end face 11 of the connecting tube 7 and a stop plate 12, which is mounted on the inner fitting 13 of the valve housing 1 and has a predetermined thickness for precise adjustment of the valve. A movable element 14 is provided. Applicable 1
The mover 14 is made of a corrosion-resistant magnetic material and is disposed coaxially within the valve casing 1 at a small radial distance from the valve casing 1 and forming a magnetic gap. . The cylindrical mover 14 is coaxially provided with a first blind hole 15 and a second blind hole 16 starting from both end faces thereof, and in this case, the second blind hole 1
6 is open toward the nozzle body 9 and has a flat bottom, and the bottom has a tenth blind hole 15 and a twentieth blind hole 16.
It is provided with a coaxial hole 17 that allows communication between the two. The diameter of the hole 17 is smaller than the diameter of the 20th blind hole 16. Mover 14
The end of the nozzle body 9K facing toward K is configured as a deformed part.

This deformed portion 18 has the role of engagingly coupling the mover 14 with the needle valve 2T by gripping the holder 28 that forms a part of the needle valve 27 and fills the 20th blind hole 16. ing. Deformed portion 18 of mover 14
By caulking, the deformed portion 18 of the movable element 14 can grip the holder 28. A compression spring 29 guided in the radial direction through the communication hole 17 of the mover 14 is placed on the plane of the holder 28 facing the connecting tube piece T, and the compression spring 29 is , is in contact with the insertion tube 30 that is fixed by being inserted into the connecting tube piece γ, and the mover 14
and the needle valve 27 with a force acting in the opposite direction to the connecting tube piece T.

A coaxial blind hole 31 having a diameter smaller than the inner diameter of the compression spring 29 is formed in the plane of the holding body 28 facing the connecting tube piece 7, and the bottom of the blind hole 31 has a diameter smaller than the inner diameter of the compression spring 29. At least one flow opening 32, for example arranged obliquely, is provided, which flow opening is surrounded by the valve housing 1 and the nozzle body 9 and which is surrounded by the needle valve 27.
It opens into an inner chamber 26 which receives the .

The needle valve 27 passes through the flow hole 20 in the stopper plate 12 and the guide hole 21 in the nozzle body 9 while having play in the radial direction, and furthermore, the needle pin 22 of the needle valve 27 passes through the flow hole 20 in the stopper plate 12 and the guide hole 21 in the nozzle body 9. It protrudes outward from the injection opening 23 of.

A conical valve seat surface 24 is formed between the guide hole 21 and the injection opening 23 of the nozzle body 9, which valve seat surface cooperates with a conical sealing section 25 of the needle valve 27. do. The combined length of the needle valve 27 and the armature 14 from the sealing section 25 is such that the armature 14 leaves a working gap with respect to the end face 11 of the connecting tube piece γ in the de-energized state of the electromagnetic coil 3. Designed. When the electromagnetic coil 3 is energized, the width of the working gap decreases, but the movable element 14
and the connecting tube piece T do not come into direct contact with each other.

The needle valve 27 has two guide parts 33 , 34 , which guide the needle valve 2γ through the hole 21 .
It is guided within and leaves an axial flow hole for the fuel, which is designed, for example, square.

In the energized state of the electromagnetic coil 3, the mover 14 is lifted in the opening direction of the needle valve 27 against the force of the compression spring 29. It touches the plane facing 9.

An embodiment of the stopper plate 12 is shown in FIG. A notch groove 37 is provided between the flow hole 20 and the outer periphery of the stopper plate 12, and the gap width of the notch groove is equal to the width of the gap between the holder 28 and the stopper shoulder 39 of the needle valve. It is larger than the diameter of the needle valve 27 in the needle valve part 38 corresponding to the plate.

In addition to the cutout groove 37, the circumferential surface of the flow hole 200 is interrupted by at least one cutout 42, preferably arc-shaped. This divides the circumferential surface of the flow hole 20 into at least two segments 43 and thus reduces the contact surface between the stop shoulder 39 and the stop plate 12.

When using the solenoid valve according to the invention, the adhesion between the stop shoulder 39 of the needle valve 27 and the plane of the stop plate 12 that rests on the nozzle body 9 can be significantly reduced. The best placement value of the notch 42 depends on various parameters such as the diameter of the stopper shoulder 39, the nature and area of the material of the needle valve 27 and the stopper plate 12, the force on the needle valve 27, and the flow conditions.

The magnetic flux passes through the outer wall of the valve casing 1 to the flux conducting portion 40.
through the cylindrical armature 14, from where it flows back into the valve housing 1 via the connecting tube 7 with the conducting flange 50, which serves as an iron core.

[Brief explanation of drawings]

FIG. 1 shows an advantageous embodiment of the fuel injection valve of the invention;
FIG. 2 is a plan view showing the stopper plate of the present invention.

Claims (3)

[Claims] 1. An electromagnetically operated fuel injection valve for a fuel injection system of an internal combustion engine, comprising a valve casing made of ferromagnetic material, an iron core surrounded by an electromagnetic coil, and a cylindrical movable member cooperating with the iron core. the armature is fixedly connected to the needle valve, and when the electromagnetic coil is energized, the stop shoulder of the needle valve facing towards the iron core is connected to the valve casing; The needle valve is adapted to abut against a stopper plate fixed between the nozzle body and the nozzle body that guides the needle valve, and the stopper plate has one cutout in addition to a flow hole that receives a cylindrical portion of the needle valve. a notched groove having a gap width greater than the diameter of the cylindrical portion of the needle valve and extending radially from the flow hole to the outer edge of the stopper plate; In this type, the circumferential surface of the flow hole (20) of the stopper plate (12) has at least one notch (4) in addition to the notch groove (37).
2) An electromagnetically operated fuel injection valve, characterized in that it is interrupted by. 2. 2. The fuel injection valve according to claim 1, wherein at least one of the notches (42) provided in addition to the notch groove (37) is arc-shaped. 3. In addition to the notch groove (37), there are two notches (4
2) is provided in claim 1 or 2.
Fuel injection valve as described in section.