KR102638111B1 - Fuel injector having a function preventing from wavering of a needle during operation - Google Patents

Abstract

The present invention relates to a fuel injector that can prevent movement of the needle during operation by generating fluid resistance to reduce the kinetic energy of the armature during closing operation.
The fuel injector capable of preventing movement of the needle during operation according to the present invention includes an armature 33 through which the needle 21 penetrates and whose upper and lower ends are restrained by a stopper 23 and a positioning ring 27. In the injector, the armature 33 includes an armature body 34 in which a fuel passage 33a through which fuel passes is formed so as to be concentric with the needle 21; and an armature holder 35 fixed to the bottom of the armature body 34 to support the armature body.

Description

Fuel injector that can prevent needle movement during operation {FUEL INJECTOR HAVING A FUNCTION PREVENTING FROM WAVERING OF A NEEDLE DURING OPERATION}

The present invention relates to a fuel injector that can prevent movement of the needle during operation by generating fluid resistance to reduce the kinetic energy of the armature during closing operation.

Fuel injectors are applied to engines and serve to inject atomized fuel into the combustion chamber at high speed.

As shown in FIG. 1, the main structure of the fuel injector 100 is such that when a magnetic circuit is formed by the solenoid, the magnetic core 132, and the armature 133 by supplying power, the armature 133 generates a needle ( By lifting the stopper 123 fastened to 121, the ball 122 formed at the bottom of the needle 121 opens the injection hole of the valve seat so that fuel is injected.

When the power to the fuel injector 100 is cut off, the stopper 123 and the needle 121 descend due to the elastic force of the pressure spring 125, and the ball 122 closes the injection hole, thereby injecting fuel. is stopped.

Meanwhile, when fuel injection is stopped, that is, when the fuel injector 100 is closed, the stopper 123 also lowers the armature 133.

In the fuel injector 100 according to the prior art, a phenomenon occurred in which the kinetic energy formed by the lowering of the armature 133 was transferred to the positioning ring 127 at the closed point.

At the closing point of the fuel injector 100, the needle 121 and the armature 133 begin to descend simultaneously, but the needle 121 returns to its original position first, and then the armature 133 returns to its original position. Return to position. When the needle 121 returns, primary bouncing is formed, and when the armature 133 returns, the armature 133 strikes the positioning ring 127 as shown in the portion indicated by C in FIG. 3, and the needle There was a problem in that it caused additional bouncing of the needle 121, causing unintended movement of the needle 121.

In addition, in multi-stage injection in which two or more fuel injections occur in one combustion cycle, there is a problem in which dispersion between each injection occurs due to the kinetic energy applied when the armature 133 is lowered in addition to the operation signal of the needle 121. There was this.

KR 10-2013-0065352 A (2013.06.19, Name: Direct injection fuel injector)

The present invention was invented to solve the above problems. By using the resistance of the fluid to prevent the kinetic energy of the armature from being transferred to the needle when closed, the needle is operated to minimize unintended movement of the needle. The purpose is to provide a fuel injector that can prevent the behavior of.

A fuel injector capable of preventing movement of the needle during operation according to the present invention for achieving the above object is a fuel injector including an armature through which the needle penetrates and whose upper and lower ends are restrained by a stopper and a positioning ring. The armature includes an armature body in which a fuel passage through which fuel passes is formed so as to be concentric with the needle; and an armature holder fixed to the bottom of the armature body to support the armature body.

An upper fuel hole through which fuel passes is formed around the upper inner surface of the armature body at intervals on the outer surface of the armature holder, and is located in the armature holder at a position spaced apart from the center of the armature holder in the circumferential direction of the armature holder. Lower fuel holes through which fuel passes are formed at intervals from each other, and the center of the lower fuel hole is formed outside the inner diameter of the upper fuel hole.

The inner surface of the armature body is characterized in that it is formed as an inclined surface so that the cross-sectional area becomes wider toward the lower part of the armature body.

The lower end of the inclined surface is characterized in that it is located between the distance from the center of the needle to the part closest to the center in the lower fuel hole to the distance farthest from the center.

The upper inner diameter of the armature body is located closer to the center of the needle than the distance from the center of the needle to the portion closest to the center of the needle in the lower fuel hole.

The outer diameter of the upper end of the positioning ring is characterized in that it is equal to the distance from the center of the needle to the part closest to the center of the needle in the lower fuel hole.

The outer diameter of the top of the positioning ring is characterized in that it is formed larger than the inner diameter of the top of the armature body.

A holder fastening part is formed at a stepped level to accommodate the circumference of the armature holder around the lower end of the armature body, and the circumference of the armature holder is inserted into the holder fastening part to couple the armature body and the armature holder.

The armature body and the armature holder are joined to each other by butt welding.

Meanwhile, the fuel injector that can prevent movement of the needle during operation according to the present invention includes an armature through which the needle penetrates and whose upper and lower ends are restrained by a stopper and a positioning ring, wherein the armature is connected to the needle and An armature body formed with a fuel oil path through which fuel passes so as to be concentric; and an armature holder fixed to the bottom of the armature body to support the armature body, wherein the fuel flow path forms a straight section parallel to the needle for a certain distance from the top of the armature body, and thereafter, the armature body is fixed to the armature body. It is characterized by forming an expansion section whose cross-sectional area is enlarged so that the distance from the needle increases toward the bottom of the body.

An upper fuel hole is formed around the upper inner circumference of the armature body at a distance from the outer surface of the armature holder, through which fuel passes and becomes the straight section, and the upper fuel hole is formed at a position spaced apart from the center of the armature holder in the armature holder. They are formed at intervals in the circumferential direction of the armature holder, and a lower fuel hole connected to the lower end of the expansion section is formed.

The inner surface of the armature body is formed as an inclined surface so that the cross-sectional area becomes wider toward the lower part of the armature body to form the expansion section, and the lower end of the inclined surface extends from the center of the needle to the part closest to the center in the lower fuel hole. It is characterized in that it is located between the distance from the distance to the part furthest from the center.

The upper inner diameter of the armature body is located closer to the center of the needle than the distance from the center of the needle to the portion closest to the center of the needle in the lower fuel hole.

The outer diameter of the upper end of the positioning ring is characterized in that it is equal to the distance from the center of the needle to the part closest to the center in the lower fuel hole.

The outer diameter of the top of the positioning ring is characterized in that it is formed larger than the inner diameter of the top of the armature body.

A holder fastening part is formed at a stepped level to accommodate the circumference of the armature holder around the lower end of the armature body, and the circumference of the armature holder is inserted into the holder fastening part to couple the armature body and the armature holder.

The armature body and the armature holder are joined to each other by butt welding.

According to the fuel injector capable of preventing movement of the needle during operation of the present invention having the above configuration, the cross-sectional area of the upper surface of the positioning ring is formed to be large, so that the fuel acts as resistance to the lowering of the armature body and the armature holder. By increasing the amount, the movement of the needle at the closing point of the fuel injector is minimized. As the cross-sectional area of the upper surface of the positioning ring increases, the amount of fuel filled between the upper surface of the positioning ring and the bottom surface of the armature holder increases, and the fuel filled between the positioning ring and the armature holder is connected to the armature body and the armature. It acts as resistance to the lowering of the holder. Through this, the kinetic energy of the armature body and the armature holder is blocked from being transmitted to the needle through the position ring.

Additionally, the descending speed of the armature body and the armature holder is reduced, thereby reducing vibration that occurs when the armature holder collides with the positioning ring.

In addition, if multi-stage injection is applied, vibration of the armature body and armature holder is not transmitted, and it operates only with the operating signal of the fuel injector, thereby preventing dispersion between each injection.

1 is a cross-sectional view of a fuel injector according to the prior art.
Figure 2 is an enlarged cross-sectional view of the main part of a fuel injector according to the prior art.
Figure 3 is an enlarged cross-sectional view showing the area where the armature and positioning ring contact in a fuel injector according to the prior art.
Figure 4 is a cross-sectional view of a fuel injector capable of preventing movement of the needle during operation according to an embodiment of the present invention.
Figure 5 is an enlarged cross-sectional view of the main portion of a fuel injector capable of preventing movement of the needle during operation according to an embodiment of the present invention.
Figure 6 is an enlarged cross-sectional view showing the area where the armature body, armature holder, and positioning ring contact in a fuel injector that can prevent movement of the needle during operation according to an embodiment of the present invention.
Figure 7 is a main sectional view showing a state during operation of a fuel injector capable of preventing movement of the needle during operation according to an embodiment of the present invention.
Figure 8 is a perspective view of the main part of a fuel injector that can prevent movement of the needle during operation according to an embodiment of the present invention.
Figure 9 is an enlarged cross-sectional view of the main portion of a fuel injector capable of preventing movement of the needle during operation according to another embodiment of the present invention.

Hereinafter, a fuel injector capable of preventing needle movement during operation according to the present invention will be described in detail with reference to the attached drawings.

Inside the space formed by the housing 11, cover 12, and carrier 13, the components constituting the magnetic circuit and the components that operate once the magnetic circuit is formed are arranged to produce fuel required for combustion of the engine. Spray.

The needle 21 is formed to penetrate the center of the housing 11, the cover 12, and the carrier 13. A ball 22 is formed at the bottom of the needle 21, and when the ball 22 opens the injection hole formed in the valve seat 14, fuel is injected, and the ball 22 closes the injection hole. If you do this, fuel injection will stop.

A stopper 23 and a position ring 27 are fixedly installed on the needle 21 and spaced apart from each other. An armature 33, which will be described later, is installed between the stopper 23 and the positioning ring 27, so that the needle 21 operates by the armature 33 when constructing a magnetic circuit.

A pressure spring 25 is installed at the upper end of the stopper 23 to exert an elastic force in the direction of lowering the needle 21, and the lower end of the stopper 23 is connected to the stopper 23 and the pressure spring 25. ) is installed in close contact with the damper spring (26) to prevent back spraying.

The solenoid 31 is magnetized when power is applied, thereby creating a magnetic circuit.

The magnetic core 32 forms the circuit when the solenoid 31 is magnetized.

Once the magnetic circuit is formed, the armature 33 serves to transmit it to the needle 21.

In the present invention, when the fuel injector 1 is operated, especially in a closed operation in which the fuel injector 1 operates in a closed state after injecting fuel, the needle 21 bounces in the fuel injector 1. is suppressed so that the movement of the needle 21 is minimized.

To this end, after fuel is injected from the fuel injector 1, while the fuel injector 1 is lowered for closing, the kinetic energy generated when the armature 33 is lowered is reduced using fluid resistance. Let’s do it.

To this end, the armature 33 is composed of an armature body 34 and an armature holder 35.

In addition, when the armature 33 and the positioning ring 27 are separated, a greater amount of fluid, that is, fuel, is allowed to flow between the armature 33 and the positioning ring 27, and the fuel flows into the positioning ring 27. It operates as resistance when the armature 33 descends, preventing the falling armature 33 from hitting the position ring 27.

The area of the upper surface of the positioning ring 27 is increased so that a greater amount of fluid can flow into the space S between the armature 33 and the positioning ring 27. In the fuel injector 100 according to the prior art, the positioning ring 127 only served to restrain the lower part of the armature 133. However, in the present invention, the positioning ring 27 not only serves to restrain the bottom of the armature 33, but also serves to increase the amount of fluid stored between the bottom of the armature 33 and the positioning ring 27. do.

The position ring 27 has an upper body 27a, a middle body 27c, and a lower body 27b sequentially formed from the top of the position ring 27. The upper body 27a, which supports the lower end of the armature 33 and whose upper surface is in contact with the lower end of the armature 33, has the largest diameter, and the lower body 27b has the smallest diameter.

If the position ring 27 is formed so that the upper surface, that is, the upper surface of the upper body 27a, is wide, the space between the armature 33 and the upper surface of the position ring 27 is increased due to the increased area ( S) increases the amount of oil received.

In this way, a greater amount of fuel exists between the armature 33 and the positioning ring 27, and this fuel causes the armature 33 to move downward when the needle 21 completes fuel injection. Avoid hitting the position ring 27 or allow its size to be attenuated.

In order to increase the area of the upper surface of the positioning ring 27, the upper circumference of the positioning ring 27 is positioned at a distance greater than a predetermined distance from the center of the needle 21.

The circumference of the upper end of the position ring 27 in contact with the armature 33 is formed to be more outer than that of the position ring 127 of the prior art. That is, the upper outer diameter D1 of the positioning ring 27 is formed at a predetermined position with respect to the outer diameter D2 of the armature 33, so that the armature 33 and the positioning ring 27 are spaced apart. At this time, more fluid, that is, fuel, is accommodated between the bottom of the armature 33 and the positioning ring 27.

Looking at FIG. 5, it can be seen that the outer diameter D1 at the top of the position ring 27 is formed at a position that is more than 1/2 of the outer diameter D2 of the armature 33. That is, the outer diameter D1 of the upper end of the position ring 27 is formed to be more than D2/2, which is 1/2 of the outer diameter of the armature 33. In the prior art, the positioning ring 127 was simply used to restrain the lower end of the armature 133 and its diameter was not large. However, in the present invention, the outer diameter D1 of the top of the positioning ring 27 is adjusted to a certain size or more so that more fuel can be accommodated in the space S between the bottom of the armature 33 and the positioning ring 27. do.

Referring to FIG. 7, the position ring 27 includes an upper body 27a whose upper surface is in contact with the bottom of the armature 33, and a lower body 27b located below the position ring 27, It includes an intermediate body (27c) between the upper body (27a) and the lower body (27b), connecting the upper body (27a) and the lower body (27b).

Here, in order to accommodate more fuel in the space S between the bottom of the armature 33 and the positioning ring 27, the outer diameter D1 of the upper body 27a is increased. For example, the outer diameter D1 of the upper body 27a is made to be more than 1/2 the outer diameter D2 of the armature 33 and smaller than the outer diameter D2 of the armature 33.

In the position ring 27, the outer diameter D1 of the upper body 27a is formed to be sufficiently large by more than 1/2 of the outer diameter D2 of the armature 33, so that the upper surface of the position ring 27 By filling the space S between the bottom surface of the armature 33 with a larger amount of fuel than before, it acts as resistance to the lowering of the armature 33 and reduces the kinetic energy of the armature 33. .

As the outer diameter of the positioning ring 27 increases, the position of the fuel hole formed in the armature 33 through which fuel flows needs to be changed.

That is, an upper fuel hole (34b) and a lower fuel hole (35c) are formed at the upper and lower ends of the armature 33, respectively. Among these, the lower fuel hole (35c) is disposed adjacent to the position ring 27. ) must be adjusted.

The armature 33 consists of an armature body 34 and an armature holder 35, and the lower fuel hole 35c is formed in the armature holder 35.

At this time, the center of the lower fuel hole (35c) in the armature holder (35) is located further away from the center of the needle (21) than the outer circumference of the upper body (27a), so that the lower fuel When the fuel flows through the ball 35c, it is prevented from interfering with the circumference of the positioning ring 27.

Alternatively, the outer diameter D1 of the upper body 27a, which is the maximum outer diameter of the position ring 27, is measured from the center of the armature holder 35 to the lower fuel hole 35c in the armature holder 35. It can be formed equal to the distance (d1) to the part closest to the center. That is, it can be seen in FIG. 6 that the circumference of the upper body 27a and the portion closest to the center of the lower fuel hole 35c are located on line L1. Through this, the amount of fuel filled between the upper surface of the positioning ring 27 and the lower surface of the armature holder 35 is increased, while preventing interference with the flow of fuel through the lower fuel hole 35c.

In the prior art, as shown by A in FIG. 3, the contact area between the armature 133 and the positioning ring 127 is narrow, and a sufficient amount of fuel is not filled therein, so the armature 33 and the positioning ring 127 are not filled with a sufficient amount of fuel. Even if the positioning rings 127 were spaced apart, the amount of fuel filled between them providing the kinetic energy of the armature 133 was minimal.

However, in the present invention, the contact area between the armature 33 and the positioning ring 27 is sufficiently secured so that the needle 21 and the armature 33 are used to close the fuel injector 1 after injection. By allowing a sufficient amount of fuel to flow into the space (S) between the armature 33 and the positioning ring 27 during descent, the fuel acts as a resistance to prevent the descent of the armature 33, Reduces the kinetic energy of the armature 33.

As the kinetic energy of the armature 33 decreases, the amount of impact applied at the moment the armature 33 descends and comes into contact with the positioning ring 27 also decreases, thereby minimizing or preventing bouncing of the needle 21, The movement of the needle 21 is minimized or prevented.

Looking at the structure of the armature 33 in detail, the armature 33 includes an armature body 34 in which a fuel passage 33a through which fuel passes is formed so as to be concentric with the needle 21, and the armature body 34 ) and includes an armature holder 35 that is fixed to the bottom of the armature and supports the armature body.

The fuel passage 33a formed between the armature body 34 and the armature holder 35 is formed to have a larger cross-sectional area toward the lower part of the armature 33.

If the cross-sectional area of the armature 33 is formed to become wider toward the lower part of the armature 33, the discharge of fuel from the inside of the armature 33 is delayed when the shopping armature 33 is lowered, thereby reducing kinetic energy. Make it possible. The armature 33 completes fuel injection and descends to close the fuel injector 1, and at this time, the fuel inside the armature 33 relatively flows from the bottom to the top of the armature 33. At this time, if the width of the fuel passage 33a through which the fuel flows inside the armature 33 is formed to become narrower towards the upper part of the armature 33, that is, wider towards the lower part of the armature 33, When the shopping armature 33 is lowered, the discharge of fuel from inside the armature 33 is delayed, and the kinetic energy is reduced so that the armature 33 does not hit the positioning ring 27 or even if it hits the needle 21 does not affect the behavior of

For this purpose, the fuel passage 33a forms a straight section parallel to the needle 21 at a certain distance from the top of the armature body 34, and thereafter, as it moves toward the lower part of the armature body 34, An expansion section is formed whose cross-sectional area is enlarged to increase the distance from the needle 21. In the expansion section, the inner surface of the armature body 34 is formed as an inclined surface 34a so that the cross-sectional area becomes wider as it goes downward, and the armature holder 35 is relatively formed so that the inner surface is vertical, The fuel passage formed between the inner surface of the body 34 and the inner surface of the armature holder 35 has a cross-sectional area that increases toward the lower part of the armature 33. The inner surface of the armature body 34 may be formed with a plurality of steps so that the cross-sectional area increases toward the bottom. However, when passing through the steps, the flow rate may change rapidly, so it is formed as an inclined surface so that the flow rate can be reduced at a constant rate. It is desirable to be

The armature holder 35 is in contact with the outer surface of the needle 21, has a vertical portion 35a formed along the axial direction of the needle 21, and the needle ( It includes a horizontal portion (35b) extending in a direction perpendicular to the elevation of 21).

A damper spring 26 is installed on the outside of the vertical part 35a, so that the upper end of the damper spring 26 is supported by the lower end of the stopper 23, and the lower end of the damper spring 26 is supported by the horizontal part. By being supported by (35b), the stopper 23 and the pressure spring 25 are brought into close contact.

An upper fuel hole (34b) is formed at the top of the armature (33), and a lower fuel hole (34b) is formed at the bottom of the armature (33). That is, the upper inner circumference of the armature body 34 is formed at intervals from the outer surface of the armature holder 35 to form an upper fuel hole 34b through which fuel passes, and the upper fuel hole 34b through which fuel passes is formed. In the horizontal portion 35b, lower fuel holes 35c through which fuel passes are formed at intervals along the circumference at a position spaced apart from the center of the armature holder 35.

The upper fuel hole (34b) becomes the straight section described above together with the inner side of the armature holder 35, and the lower fuel hole (35c) is connected to the lower end of the extended section.

The lower end of the inclined surface 34a is between the distance d1 from the center of the needle 21 to the part closest to the center in the lower fuel hole 35c and the distance d2 to the part farthest from the center. It is located in That is, the lower end of the inclined surface 34a forming the expansion section is connected to the lower fuel hole 35c.

During fuel injection, fuel flows into the interior of the armature 33 through the upper fuel hole 34b and is discharged through the lower fuel hole 35c (see arrow in FIG. 8), and the fuel injector 1 When closed, the fuel relatively flows in through the lower fuel hole (35c) and then is discharged through the upper fuel hole (34b).

When the fuel injector 1 is closed, the armature 33 moves in a downward direction, so that fuel flows relatively from the lower fuel hole 35c to the upper fuel hole 34b inside the armature 33. It flows as At this time, if the fuel passage (33a) formed between the inner surface of the armature body 34 and the outer surface of the armature holder 35 becomes narrower toward the upper part of the armature 33, the fuel flows from the inflow side. The cross-sectional area of the discharge side is reduced and acts as resistance when the armature 33 is lowered. Accordingly, as the kinetic energy of the armature 33 decreases when the armature 33 is lowered, the amount of impact applied at the moment the armature 33 descends and comes into contact with the positioning ring 27 is also reduced, so the needle ( By minimizing or preventing the bouncing of the needle 21, the movement of the needle 21 is minimized or prevented.

As the armature 33 is formed of the armature body 34 and the armature holder 35, a configuration for combining the armature body 34 and the armature holder 35 can be applied.

That is, a stepped holder fastening portion 34c is formed around the lower end of the armature body 34 to accommodate the circumference of the armature holder 35, and the circumference of the armature holder 35 is formed with the holder fastening portion 34c. ) is inserted into the armature body 34 and the armature holder 35 (see Figure 6).

Alternatively, as shown in FIG. 9, the lower circumference of the armature body 34 and the lower circumference of the armature holder 35 are formed flat, and the armature body 34 and the armature 34 are welded to each other, especially butt welding. The armature holder 35 can be integrated.

In addition, the upper fuel hole (34b) and the lower fuel hole (35c) are at different distances from the needle 21, that is, the upper fuel hole (34b) is at a greater distance from the needle (21) than the lower fuel hole (35c). It can be located adjacent to .

Previously, the armature 33 includes an armature body 34 and an armature holder 35, and the upper inner circumference of the armature body 34 is formed at intervals from the outer surface of the armature holder 35 to fuel fuel. An upper fuel hole 34b through which fuel passes is formed, and fuel passes through it at intervals along the circumference at a position spaced apart from the center of the armature holder 35 in the horizontal portion 35b of the armature holder 35. The configuration in which the lower fuel hole 35c is formed was examined.

Here, the upper fuel hole 34b and the lower fuel hole 35c are positioned at different distances from the needle 21, so that the armature 33 is lowered due to fluid resistance inside the armature 33. During this time, the kinetic energy of the armature 33 is reduced.

Referring to Figure 6, the upper fuel hole 34b is formed around line F1-F1, the lower fuel hole 35c is formed around line F2, and the line F1-F1 is formed around the line F2-F2. In comparison, it is formed to be located adjacent to the needle 21.

In particular, the upper inner diameter of the armature body 34, which is the diameter of the upper fuel hole 34b, is the portion closest to the center of the needle 21 in the lower fuel hole 35c from the center of the needle 21. It is positioned closer to the center of the needle 21 than the distance d1. That is, in FIG. 6, line L2, which is the diameter of the upper fuel hole 34b, is closer to the center of the needle 21 than line L1, which is the closest portion to the center of the needle 21 in the lower fuel hole 35c. is located closer to

Accordingly, when the fuel injector 1 is lowered, the fuel flowing into the lower fuel hole 35c moves from the bottom to the top of the armature 33 and simultaneously flows from the outside to the inside of the armature 33. have it This becomes fluid resistance when the armature 33 descends to close the fuel injector 1, thereby reducing the kinetic energy of the armature 33.

In the prior art, the flow path through which fuel passes inside the armature 133 was formed parallel to the needle 121 and in the ascending and descending direction of the armature 133.

However, in the present invention, in the armature 33, the upper fuel hole 34b is formed adjacent to the needle 21, and the lower fuel hole 35c is formed adjacent to the outer circumference of the armature 33. , Compared to the case where the upper fuel hole 34b and the lower fuel hole 35c are formed parallel to the needle 21, the flow of fuel inside the armature 33 acts as resistance. Accordingly, the kinetic energy of the armature 33 is reduced when the armature 33 is lowered, and the amount of impact applied at the moment of contact with the positioning ring 27 is also reduced, thereby minimizing the bouncing of the needle 21 or By preventing this, the movement of the needle 21 is minimized or prevented.

As seen above, fluid resistance acts to reduce the kinetic energy of the armature 33 that descends when the fuel injector 1 is closed, thereby reducing the kinetic energy of the armature 33 when the armature 33 descends. By reducing, the amount of impact applied at the moment the armature 33 descends and comes into contact with the positioning ring 27 is also reduced, thereby minimizing or preventing the bouncing of the needle 21, thereby minimizing the behavior of the needle 21. Or prevent it.

1: fuel injector 11: housing
12: Cover 13: Carrier
14: valve seat 21: needle
22: Ball 23: Stopper
25: pressure spring 26: damper spring
27: Positioning ring 27a: Upper body
27b: lower body 27c: middle body
31: Solenoid 32: Magnetic core
33: Armature 33a: Fuel oil path
34: armature body 34a: slope
34b: upper fuel hole 34c: holder fastening part
35: armature holder 35a: vertical portion
35b: horizontal part 35c: lower fuel hole
100: fuel injector 121: needle
122: Ball 123: Stopper
125: Pressure spring 126: Damper spring
127: Positioning ring 131: Solenoid
132: Magnetic core 133: Amateur

Claims (17)

In a fuel injector including an armature through which a needle penetrates and whose upper and lower ends are restrained by a stopper and a positioning ring,
The amateur said,
an armature body in which a fuel passage through which fuel passes is formed to be concentric with the needle; and
Includes an armature holder fixed to the bottom of the armature body to support the armature body,
An upper fuel hole through which fuel passes is formed around the upper inner surface of the armature body at intervals on the outer surface of the armature holder,
In the armature holder, lower fuel holes through which fuel passes are formed at a distance from the center of the armature holder at intervals in the circumferential direction of the armature holder,
The center of the lower fuel hole is formed outside the inner diameter of the upper fuel hole,
A fuel injector capable of preventing needle movement during operation, wherein the outer diameter of the upper end of the positioning ring is formed to be larger than the upper inner diameter of the armature body. delete According to paragraph 1,
A fuel injector capable of preventing movement of the needle during operation, wherein the inner surface of the armature body is formed as an inclined surface so that the cross-sectional area becomes wider toward the lower part of the armature body. According to paragraph 3,
The lower end of the inclined surface is located between the distance from the center of the needle to the part closest to the center in the lower fuel hole and the distance from the part furthest from the center to prevent movement of the needle during operation. fuel injector. According to paragraph 1,
The upper inner diameter of the armature body is located closer to the center of the needle than the distance from the center of the needle to the part closest to the center of the needle in the lower fuel hole to prevent movement of the needle during operation. fuel injector. According to paragraph 1,
The outer diameter of the top of the positioning ring is,
A fuel injector capable of preventing movement of the needle during operation, wherein the distance from the center of the needle to the portion closest to the center of the needle in the lower fuel hole is equal to the distance. delete According to paragraph 1,
A holder fastening portion is formed at a stepped level around the lower edge of the armature body to accommodate the circumference of the armature holder,
A fuel injector capable of preventing movement of the needle during operation, characterized in that the armature body and the armature holder are coupled by fitting the circumference of the armature holder into the holder fastening part. According to paragraph 1,
A fuel injector capable of preventing movement of the needle during operation, wherein the armature body and the armature holder are joined to each other by butt welding. In a fuel injector including an armature through which a needle penetrates and whose upper and lower ends are restrained by a stopper and a positioning ring,
The amateur said,
an armature body in which a fuel passage through which fuel passes is formed to be concentric with the needle; and
It includes an armature holder fixed to the bottom of the armature body to support the armature body,
The fuel oil path forms a straight section parallel to the needle at a certain distance from the top of the armature body,
After that, an expansion section is formed whose cross-sectional area is enlarged so that the distance from the needle increases toward the lower part of the armature body,
An upper fuel hole is formed around the upper inner circumference of the armature body at a distance from the outer surface of the armature holder, through which fuel passes and becomes the straight section,
In the armature holder, a lower fuel hole is formed at a distance from the center of the armature holder and spaced apart from each other in the circumferential direction of the armature holder, and is connected to the lower end of the expansion section,
A fuel injector capable of preventing needle movement during operation, wherein the outer diameter of the upper end of the positioning ring is formed to be larger than the upper inner diameter of the armature body. delete According to clause 10,
The inner surface of the armature body is formed as an inclined surface so that the cross-sectional area becomes wider toward the lower part of the armature body, thereby forming the expansion section,
The lower end of the inclined surface is located between the distance from the center of the needle to the part closest to the center in the lower fuel hole and the distance from the part furthest from the center to prevent movement of the needle during operation. fuel injector. According to clause 10,
The upper inner diameter of the armature body is located closer to the center of the needle than the distance from the center of the needle to the part closest to the center of the needle in the lower fuel hole to prevent movement of the needle during operation. fuel injector. According to clause 10,
The outer diameter of the top of the positioning ring is,
A fuel injector capable of preventing movement of the needle during operation, wherein the distance from the center of the needle to the portion closest to the center of the needle in the lower fuel hole is equal to the distance. delete According to clause 10,
A holder fastening portion is formed at a stepped level around the lower edge of the armature body to accommodate the circumference of the armature holder,
A fuel injector capable of preventing movement of the needle during operation, characterized in that the armature body and the armature holder are coupled by fitting the circumference of the armature holder into the holder fastening part. According to clause 10,
A fuel injector capable of preventing needle movement during operation, wherein the armature body and the armature holder are joined to each other by butt welding.

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