JPH0816471B2 - Electromagnetic fuel injection valve - Google Patents

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an electromagnetic type fuel injection valve, and more particularly to an electromagnetic fuel injection valve that is suitable for reducing noise and improved in assembly workability. Is.

[Conventional technology]

JP-A-58-140508 is known as a recent technology relating to this type of electromagnetic fuel injection valve.

The corn chip (swirler) in this known example is fixed by a chip member which is a rigid member. The chip tip is screwed and fixed to the nozzle tip (valve guide).

[Problems to be solved by the invention]

In the electromagnetic fuel injection valve according to the above-mentioned known technology,
The vibration caused by the reciprocating operation of the movable valve is transmitted to the nozzle chip (valve guide) through the cone chip (swirler) and generates noise.

Further, there is a problem in that a rotational force is applied through a contact portion between the cone chip (swirler) and the chip retainer when the chip screw is screwed in, and the position accuracy is deteriorated. Further, the positional deviation of the cone chip (swirler) hinders the reciprocating motion of the control rod (movable valve), which causes noise.

Further, in order to accurately determine the spray amount of the liquid, the valve opening / closing operation between the valve body and the valve seat requires fine and high precision in proportion to the control signal. Furthermore, it is necessary to select a corn chip (swirler), and there is a problem that the conventional fixing method using screws causes complicated work.

The object of the present invention is to eliminate the drawbacks of the prior art described above,
An object of the present invention is to provide an electromagnetic fuel injection valve that produces a small amount of noise, can perform precision spraying, and is easy to assemble.

[Means for solving problems]

In order to achieve the above object, the injection valve of the present invention is in contact with a movable valve having a movable iron core fixed to a valve body, an electromagnetic coil and a fixed iron core for driving the movable iron core with electromagnetic force, and the valve body. It is applied to an electromagnetic fuel injection valve having an outer casing of the injection valve and a conical valve seat integrally fixed to the conical valve seat, and a plurality of conical surfaces having the same angle corresponding to the conical valve seat and the conical surface. A swirler having a through hole into which the valve element is slidably fitted along the central axis of the spiral groove and the conical surface, and a stopper fixed to the opening end of the injection valve yoke.
The swirler is provided with an elastic member which is interposed between the bottom surface of the conical surface of the swirler and the stopper to urge the swirler toward the conical valve seat, and the conical valve seat is pressed against the conical surface of the swirler. In this state, the valve guide that forms the conical valve seat is fixed to the yoke.

[Action]

According to the above configuration, since the swirler is biased and pressed by the elastic member toward the conical valve seat, there is an effect of attenuating noise propagating in this portion.

Further, since the conical valve seat can be pressed against the swirler while the elastic member is being compressed by the swirler, the workability can be improved.

〔Example〕

An embodiment of the present invention will be described below with reference to FIG. The magnetic circuit consists of a core 6, a yoke 7 and a plunger 1a.
Inside, the spring 9 that presses the movable valve 1 consisting of the plunger 1a and the ball portion 1b that is the valve body against the conical valve seat of the valve guide 5, the spring adjuster 13 that adjusts the load of the spring, the gap between the yoke 7 and the core 6 It is composed of an O-ring 10, an O-ring 11 and a coil 12 for exciting a magnetic circuit to prevent fuel from flowing out from the outside. The fuel is the filter 14, inside the core 6,
It passes inside the spring adjuster 13 and further inside the plunger 1a. Further, the yoke 7 and the stopper 4 fixed to the yoke 7 and the fuel passage 3b of the elastic member 3 compression interposed between the stopper 4 and the swirler 2 pass through the groove 2b of the swirler 2 and the valve guide screwed and fixed to the yoke 7. 5 is injected into the cylinder of the engine through the orifice hole 5a. FIG. 2 shows the vicinity of the swirler 2.

The swirler 2 has a conical surface 2b having the same angle as the conical valve seat 5b of the valve guide 5, and two or more spiral fuel grooves 2b are formed in this conical surface 2d, and the axial center of the movable valve 1 Has a through hole 2c for slidably fitting.

When assembling the swirler 2, the stopper 4 is inserted into the opening end of the yoke 7, and the elastic member 3 is pressed onto the stopper. The swirler 2 is compressed on the elastic member 3 at its bottom surface 2e and stacked.
Then, the valve guide 5 is fixed to the yoke 7 with the conical valve seat 5b abutting against the conical surface 2d of the swirler 2 and being pressurized.
The fuel passes through the spiral fuel groove 2b formed on the conical surface 2d of the swirler 2 that abuts the conical valve seat 5b of the valve guide 5 assembled in this way, and passes through the orifice hole 5a of the valve guide 5.
Is squeezed into a swirling flow, and the fuel is atomized and injected. The elastic member 3 has the fuel passages 3b evenly arranged in the circumferential direction and is pressed by the stopper 4 to be pressed and positioned by the conical valve seat of the valve guide 5. Further, since the movable valve 1 slides back and forth in the hole 2c of the swirler 2,
Although vibration is generated, since the elastic member 3 absorbs the vibration,
Since the generation of noise is reduced and the pressing force can be evenly held, an impact load such as a lateral displacement of the movable valve 1 is also absorbed and relieved. As a result, wear of the hole 2c of the sliding part is reduced,
Improves durable life. Further, the elastic member 3 is the swirler 2
The lateral deviation of the movable valve 1 that reciprocates in the through hole can be absorbed and alleviated, and the centering of the fixed conical valve seat 5b on the same conical surface that abuts the swirler 2 biased by the elastic member 3 The action works, and the ball 1b at the tip of the movable valve that reciprocates in the through hole of the swirler 2 is compensated for the positional deviation so as to be concentric with the orifice 5a of the conical valve seat, and the valve between the ball and the valve seat is reliably opened and closed. The swirler 2 can be attached to the elastic member 3
Even if it is supported by the valve guide 5, since the valve guide 5 is fixed to the yoke 7, the valve opening / closing operation between the ball 1b of the movable valve 1 and the conical valve seat 5b of the valve guide 5 does not change the stroke and the movable valve The control is finely and precisely controlled in proportion to the control signal given to the control signal 1, so that stable and accurate fuel spray control can be performed, and particularly, the minimum spray amount can be accurately controlled. FIG. 3 shows a rubber molded product used as the elastic member 3, in which the fuel passages 3b are arranged at equal intervals in the circumferential direction, and the surface 3c in contact with the stopper 4 is flat. A flexible rigid resin molded product may be used instead of the rubber molded product.

FIG. 4 shows an elastic member 3 ′ in which a number of fuel passage holes 3 b are evenly provided on the side surface of a drawn product (conical leaf spring) of a thin plate having a spring property, and a contact portion 3 c-1 with the stopper 4 is shown. Also, the contact portion 3c-2 with the swirler 2 is flat.

FIG. 5 shows an embodiment different from that described above and uses a coil spring 3 ″ as an elastic member.

6 and 7 show examples of the swirler 2 and the swirler 2 ', respectively. 2a is a central hole, and 2b and 2b 'are spiral grooves.

〔The invention's effect〕

According to the present invention, the vibration due to the reciprocating motion of the movable valve can be absorbed, and the generation of sound can be reduced.
Since the stopper, the elastic member, the swirler, and the valve guide can be assembled by stacking, the assembling is easy, and the positional deviation at the time of assembling the swirler can be compensated by the elastic member.

[Brief description of drawings]

FIG. 1 is a vertical sectional view of a fuel injection valve according to an embodiment of the present invention,
2 is a partially enlarged view of FIG. 1, FIG. 3 is a perspective view of an elastic member in the above embodiment, FIG. 4 is a perspective view of an elastic member in an embodiment different from the above, and FIG. 5 is an embodiment different from the above. An example cross-sectional view, FIG. 6, and FIG. 7 are plan views of an example of a swirler, respectively. 1 ... movable valve, 2 ... swirler, 3 ... elastic member, 4 ...
… Stoppers, 5 …… Valve guide, 6 …… Core, 7 ……
Yoke, 8 ... Ring, 9 ... Spring, 10 ... O-ring,
11 …… O-ring, 12 …… coil, 13 …… spring adjuster, 14 …… filter.

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Yoshio Okamoto 502 Jinritsu-cho, Tsuchiura-shi, Ibaraki Machinery Research Laboratory, Hiritsu Manufacturing Co., Ltd. (56) References JP-A-63-162960 (JP, A) JP-A-58 -140508 (JP, A) Actually opened 59-73575 (JP, U)

Claims (3)

[Claims] 1. A movable valve 1 in which a movable iron core 1a is fixed to a valve body 16.
And an electromagnetic coil 12 for driving the movable iron core with electromagnetic force and a fixed iron core 6, and a conical valve seat 5b with which the valve body abuts, in a conical surface abutting with the conical valve seat. 2d, a plurality of spiral grooves 2b provided on the conical surface, a swirler 2 provided with a through hole 2c into which the valve element is slidably fitted along the central axis of the conical surface, and a yoke of an injection valve. 7, a stopper 4 fixed to the open end of the swirler, and an elastic member 3 which is interposed between the bottom surface 2e of the conical surface of the swirler and the stopper to urge the swirler toward the conical valve seat. An electromagnetic fuel injection valve characterized in that a valve guide (5) forming a conical valve seat is pressed against the yoke while the conical valve seat is pressed against the conical surface of the swirler. 2. The electromagnetic fuel injection valve according to claim 1, wherein the elastic member is made of rubber or flexible synthetic resin. 3. The electromagnetic fuel injection valve according to claim 1, wherein the elastic member is a coil spring or a leaf spring having a cylindrical or conical surface shape.