JPS60222557A - Electromagnetic fuel injection valve - Google Patents

Abstract

PURPOSE:To facilitate machining and improve the atomization of fuel as well as accuracy in the quantity of injection by fixing a member having a fuel passage, a member on which a slit is formed and a member having an orifice, to a nozzle. CONSTITUTION:When a ball valve 12 is opened, a fuel passes through an annular gap 502 between a convex member 51 and a nozzle 5, and enters an eccentrically provided slit 504 of a swirler 52 from more than one fuel passage 503. Here, an eccentric passage of fuel is formed between the convex member 51 and an orifice member 53. Thereby, swirling force is given to the fuel, which is throttled by an orifice, permitting measurement, and is atomized and injected.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Application of the Invention] The present invention relates to an electromagnetic fuel injection valve, and particularly to an electromagnetic fuel injection valve suitable for a fuel injection valve for an internal combustion engine.

[Background of the invention]

Conventionally, electromagnetic fuel injection valves (hereinafter referred to as injection valves)
As shown in Japanese Patent Application Laid-open No. 57-51944 and Japanese Patent Application Laid-open No. 57-51944, a seat element, a swirl guide plate, and a spray tip are provided in the nozzle case to give swirling force to the fuel and atomize it.
By moving the spray tip, the stroke of the movable part is changed to adjust the continuous flow rate. However, in this structure, the hole (swivel hole) drilled diagonally and eccentrically with respect to the center of the spiral guide plate is difficult to machine and takes a long time, and the through passage (orifice) at the spray tip is difficult to machine.
is large, and because the fuel coming out of the swirl hole hits the inner wall of the orifice, the spray spreads like a film at a certain angle, but a large atomization effect cannot be obtained. Further, the continuous flow rate can be adjusted by moving the spray tip, and after being moved, it is fixed by laser welding or the like, but it may shift from the predetermined position due to play in the screw during welding. Furthermore, downstream of the seat section, the large space formed between the seat element and the spiral guide plate is always filled with fuel when fuel is injected;
This may cause dripping, or it may be sucked out when negative pressure is applied to the nozzle, resulting in more fuel being injected than the amount of fuel injected during the predetermined valve opening time. This has been revealed through experiments.

[Purpose of the invention]

The purpose of the present invention is to provide easy processing, excellent atomization of fuel,
The object of the present invention is to provide an injection valve with high injection quantity accuracy.

[Summary of the invention]

The present invention includes a member (hereinafter referred to as a convex member) having a fuel passage downstream of a seat portion of a nozzle, which forms an annular gap between the nozzle and the nozzle by its protruding portion, and allows fuel passing through the annular gap to flow downstream; A member with multiple slits eccentrically cut (hereinafter referred to as swirler) and a member having an orifice (hereinafter referred to as orifice member) are fixed, and the fuel is swirled to atomize it. This makes it easy to adjust the continuous flow rate.

[Embodiments of the invention]

An embodiment of the present invention will be described below with reference to FIGS. 1, 2, 3, and 4.
5, 6, 7, and 8 and will be described.

A core 3 with an excitation coil 7 wound around its outer periphery, a yoke 2, a plunger 4 that forms a magnetic circuit with the core 3, and a ball valve 12.
A rod 6 that connects and fixes the plunger 4 to form a movable part, a seat surface 11 that seats fuel inside, and the rod 6.
It has a guide surface 13 that guides the seat surface 1 at two places.
1 downstream, a convex member 51 having a plurality of fuel passages 503 that forms an annular gap 502 between the nozzle 5 and the nozzle 5 through its protrusion 501 and allows the fuel passing through the annular gap 502 to flow downstream; A nozzle 5 includes a swallower 52 having a plurality of eccentric slits 504 and an orifice member 53 having an orifice 505 that are fixed together by plastic bonding, a two-stopper 18 that determines a predetermined stroke of the movable part, and a ball valve on the seat surface 11. 12, a spring adjuster 20 that adjusts the force of the spring 19, and a twist connector 54 that separates fuel inlet and outlet.

Here, the convex member 51, swirler 52, and orifice member 53 will be explained in detail with reference to FIGS. 3.4.5. The convex portion 501 of the convex member 51 is connected to the nozzle 5 by an annular gap 502.
In addition, the gap with the ball valve 12 is made as small as possible, and the volume from the seat part to the orifice 505 is minimized to be equal to or less than the amount of fuel injected during idling. In order to send the fuel from the annular gap 502 to the swirler 52, there is a convex portion 501 on the outer periphery.
A plurality of fuel passages 503 are opened parallel to the central axis. The swirler 52 is eccentric to the center) 50
4 are cut into a plurality of pieces, and are in contact with a circular hole 506 that is coaxial with the swirler 52, and these are punched out by press working and are sandwiched between the convex member 51 and the orifice member 53. , forming a swirling groove that gives swirling force to the fuel. The orifice member 53 has an orifice 505 at its center, which throttles and meters the fuel to which swirling force is applied.

Therefore, the area of the annular gap 502, the fuel passage 5
The total area of 03 and the total cross-sectional area of 504 are larger than the cross-sectional area of Oriswiss.

The operation will be explained based on this configuration. When no excitation current is supplied to the excitation coil 7, the ball valve 12 is pressed against the seat surface 11 by the restoring force of the spring 19 and is in a closed state. When an excitation current is supplied to the excitation coil 7, the sliding portion 8 of the rod 6 is guided by the guide surface 13 of the nozzle 5, and the movable portion is attracted toward the core 3 against the force of the spring 19. Here, the stem of the movable part is determined by the length of the nozzle 5 and the movable part, and is structured to stop at the stopper 18, so the plunger 4 and the core 3 are not in direct contact with each other. On the other hand, the fuel passes through the filter 21 provided inside the TSUYUEL connector 54, passes through the inside 55 of the spring adjuster 20, the inside of the core 3, the hole 22 made in the plunger 4, and the surface of the plunger 4 and LONDRO 02. Pass through the gap of the cut 7Ic part 23, and Londro 04
The cut surface 24 and the guide surface 13- of the nozzle 5
The material passes through the gap between the material and the material and is supplied to the seat section. In addition, a part of the fuel is transferred to a stopper provided in the core 3 (from 56 to the outer circumference of the plunger 4, to the outer circumference 5 of the bobbin 57 around which the coil 7 is wound).
Hole 6 made in the middle of core 3 through 8, 59, 6Q
1 into the recess 62 on the outside of the spring adjuster 20, and constantly flows through the gap 63 between the fuel, connector 54, and core 3.

When the ball valve 12 is opened, fuel passes through the annular gap 502 between the convex portion 51 and the nozzle 5, and enters the plurality of fuel passages 50.
3 into the eccentric slit 504 of the swirler 52,
Here, since an eccentric fuel passage is formed between the convex member 51 and the oriswiss member 53, a swirling force is applied to the fuel, which is squeezed by the orifice 504 to be metered, atomized, and injected. In this case, multiple fuel passages 503
The eccentric grooves 504 are adjusted during assembly so that they are aligned. The angle and particle size of the injected spray are determined by the swirler 52.
Eccentricity, width, and depth of the slit 504 and the oriice 50
5 diameter, and is selected based on the required angle and particle size.

Also, the maximum injection amount as the injection valve 1 is determined by the orifice member 5.
3. Since the continuous flow rate is determined by combining the swirler 52, the noil 5 with the convex member 51 fixed, and the ball valve 12, the orifice diameter and the slit 504 of the swirler 52 are determined.
0 width, eccentricity, swirler thickness, ball valve 12 when open
However, since the cross-sectional area of the orifice is smaller than the gap between the nozzle and the convex member and the passage area of the swirler slit, the orifice inner diameter 506 of the orifice member 53 must be adjusted after metal flow. Either reprocessing (Fig. 7), or pressing the outer surface of the orifice member 53 into a ring shape 507 with a diameter between the orifice diameter and the diameter of a part of the metal flow to change the orifice diameter. By changing the flow rate, it is possible to adjust the flow rate to some extent after assembly, and since the swirler is manufactured by press processing, only a certain amount of rough processing is required. On the other hand, since the convex member 51, swirler 52, and orifice 53 are each separate bodies, it is easy to improve the machining accuracy of the individual parts.

Additionally, since the volume between the seat part 11 and the orifice 505 is as small as possible as described above, experiments have shown that even if negative pressure is applied to the nozzle tip, there will be no trailing or large changes in the injection amount. It is.

〔Effect of the invention〕

According to the present invention, it is possible to provide an injection valve that is easy to process, has excellent fuel atomization, and has high injection amount accuracy.

[Brief explanation of drawings]

Fig. 1 is a sectional view of the injection valve of the present invention, Fig. 2 is a sectional view of the nozzle with a movable part including a ball valve, Fig. 3 is a sectional view of the convex member, and Fig. 4 is a sectional view of the swirler. Figure 5 is a sectional view of the orifice, Figure 6 is a view of the fuel flow when the convex member, swirler, and orifice are combined, viewed from above the convex member, and Figures 7 and 8 are the nozzle. FIG. 3 is an enlarged cross-sectional view of the tip. 51... Convex member, 52... Nuwara, 53... Orifice. Kaya 2 Prisoner ¥-3 Figure P$ 4 Figure $ Otsu Figure 9≠ $ 7 Figure/z Figure 8

Claims (1)

[Claims] 1. A magnetic circuit consisting of a yoke of magnetic material surrounding an excitation coil, a core located at the center of the excitation coil with one end in contact with the yoke, and a plunger that reciprocates in the axial direction of the yoke and core. In an electromagnetic fuel injection valve in which fuel is supplied to the seat part through the center of the core and through the gap between the nozzle and the rod, a protruding part connects the nozzle downstream of the seat part. A member having an annular gap therebetween and having a fuel passage through which the fuel passing through the annular gap flows downstream; An electromagnetic fuel injection valve characterized in that a member having an orifice that equalizes the spread of fuel subjected to swirling force is fixed to the nozzle. 2. The electromagnetic fuel injection valve according to claim 1, wherein the annular gap with the nozzle, the fuel passage, and the eccentric slit each have a cross-sectional area larger than the cross-sectional area of the oriswiss. 3.% Permissible Claim Item 1 provides a member having a fuel passage that forms an annular gap with the nozzle and allows the fuel passing through the annular gap to flow downstream, a member having an eccentric slit, and an oriice. An electromagnetic fuel injection valve characterized by a holding member fixed to a nozzle using plastic bonding. 4.% The electromagnetic fuel injection valve according to claim 1, wherein the member having the eccentric slit is a pressed product.