KR20240055424A - Armature Behavior Improvement type Injector using Armature Chamber - Google Patents

Abstract

In the armature behavior improved injector (1) using the armature chamber (10) of the present invention, a fluid resistance space (10) in which a fluid exists is formed by the armature (6) located below the stopper (4), and the fluid is As the fluid resistance gap (a) of the fluid resistance space (10) decreases in volume due to the rise of the armature (6), the repulsive force is increased and the armature kinetic energy is dissipated, thereby minimizing the unintended movement of the needle. In particular, By maximizing the kinetic energy dissipation, when the injector is opened by the stopper impact after the independent rise of the armature, the inertial force of the armature is additionally utilized for the opening behavior, and the kinetic energy dissipation of the armature that causes needle behavior is maximized, as well as a factor causing behavior dispersion. The needle bar overshoot height is also reduced.

Description

Armature Behavior Improvement type Injector using Armature Chamber}

The present invention relates to an injector, and particularly to an injector that absorbs kinetic energy in which armature behavior is improved by the repulsive force of fuel due to an increase in fluid resistance in the armature chamber due to the combination of a stopper and an armature.

In general, a fuel injection injector is required to reduce needle bouncing due to kinetic energy caused by armature rise during operation.

In particular, among the injectors, the armature-needle bar decoupling type drive method causes unintended needle movement at the time of injector opening, and for this purpose, the fluid film forming part formed by the lower surface of the stopper and the insertion structure of the armature is applied to the fluid film forming part. Try to reduce the left/right shaking of the needle.

That is, the fluid film forming portion is not formed when the armature and the positioning ring are in contact before the injector operates, but during operation (i.e., when opened), the armature rises and the space gap through which fluid flows between the positioning ring and the armature (i.e. fluid resistance can be generated by being formed as a volume.

Therefore, the fluid film forming unit absorbs and reduces the kinetic energy due to the rise of the armature, which is transmitted to the needle bar (or positioning ring) at the opening of the injector with an armature-needle bar decoupling type drive method and causes the bouncing of the needle. It works as best as possible.

Japanese registered patent JP 4603749 B (2010.10.08)

However, the fluid film forming part does not have sufficient fluid resistance of the internal fluid due to volume reduction of the space gap (i.e., volume) between the positioning ring and the armature due to the armature rising during the injector operation (i.e., when lowering). As a result, a significant amount of the armature's kinetic energy is bound to be transferred.

As a result, the needle bar of the injector causes unintended movement (i.e., needle bouncing) due to the kinetic energy of the armature transferred to the positioning ring after operation, which is unintended due to the structure in which the lower surface of the stopper is inserted into the armature. The cause of needle movement cannot be resolved.

Accordingly, taking the above into account, the present invention can minimize the unintended movement of the needle by absorbing the kinetic energy formed when the armature rises as the repulsive force of the fuel due to fluid resistance inside the valve, especially in the combination of the stopper and the armature. The armature chamber maximizes the repulsion force of the fuel by increasing the fluid resistance in the groove space when the injector operates, thereby causing needle behavior while additionally utilizing the inertia of the armature for opening behavior when the injector is opened by the stopper impact after the armature rises alone. The purpose is to provide an injector with improved armature behavior using an armature chamber that can maximize the kinetic energy dissipation of the armature and reduce the needle bar overshoot height, which is a factor causing behavior dispersion.

The injector of the present invention to achieve the above object is an armature located below the stopper, and an armature chamber in which fluid is formed is formed, and the fluid has an increased repulsive force due to a decrease in the volume of the armature chamber due to the rise of the armature. It is characterized by dissipating armature kinetic energy.

In a preferred embodiment, the armature chamber is formed by a stopper bottom protrusion of the stopper and an armature inner diameter portion of the armature.

In a preferred embodiment, the inner diameter of the armature is dug to a predetermined groove depth on the upper surface of the armature to accommodate the lower protrusion of the stopper, and the lower protrusion of the stopper is spaced apart from the inner diameter of the armature to provide a repulsive force of the fluid when the armature rises. A fluid resistance gap is formed whose volume is reduced to increase , and the fluid resistance gap is expanded in volume by a stopper inner diameter inclined portion formed on the inner diameter of the lower protrusion of the stopper.

In a preferred embodiment, the stopper has a “T”-shaped cross-sectional shape to be resiliently supported by a damper spring surrounding the lower protrusion of the stopper, and the damper spring is located beyond the armature inner diameter of the armature.

The armature behavior improved injector of the present invention implements the following actions and effects.

First, the injector can maximize the kinetic energy dissipation of the armature that causes needle behavior by absorbing the kinetic energy formed when the armature is lowered into the armature chamber, especially when the injector opening is formed by the stopper impact after the armature rises alone. The inertial force of the armature can be additionally used for opening behavior. Second, the armature chamber, which reduces the kinetic energy formed in the armature at the point of collision, is formed in a sealed structure by a combination of a stopper and an armature, so that the closed flow path can effectively increase fluid resistance compared to the open flow path of the existing fluid film forming part. Third, after the armature, whose kinetic energy has been reduced by the armature chamber, is clamped by the magnetic core, the needle bar settles in the armature and ends its upward motion, thereby reducing the vibration of the armature and reducing the overshoot height of the needle bar. Fourth, needle bar overshoot height is the largest factor causing behavioral dispersion caused by manufacturing dispersion, so it is possible to improve flow/behavior dispersion between products by reducing the height.

Figure 1 is a configuration diagram of an armature behavior improved injector using an armature chamber according to the present invention, Figure 2 is a detailed configuration diagram of an armature chamber using a combination of a stopper and an armature according to the present invention, and Figure 3 is a diagram showing the configuration of an armature chamber according to the present invention. This is the operating state of the armature chamber.

Hereinafter, embodiments of the present invention will be described in detail with reference to the attached illustration drawings. These embodiments are examples and can be implemented in various different forms by those skilled in the art to which the present invention pertains, so they are described herein. It is not limited to the embodiment.

Referring to FIG. 1, the armature chamber 10, which absorbs the kinetic energy of the armature through fluid resistance inside the valve and acts to become smaller during operation of the injector, is divided into a fuel inlet portion 1a, a magnetic circuit drive portion 1b, and a fuel injection portion ( 1c) is provided in the magnetic circuit driving unit 1b. In this case, the injector (1) is a high-pressure injector in which the needle opening behavior begins upon contact with the stopper (4).

Specifically, the fuel inlet 1a, the magnetic circuit driver 1b, and the fuel injection unit 1c are general components of the injector 1, and the fuel inlet 1a is mounted on a vehicle engine. It performs fuel inflow and foreign matter filtration from the fuel rail, and the magnetic circuit driving part (1b) is composed of a magnetic circuit part and an injector operation part that forms the magnetic force necessary for driving the injector to be driven by a solenoid, thereby forming an armature by forming a magnetic force by the solenoid. While the needle is lifted by the magnetic force and the impact force of the armature, at the time of closing due to interruption of the current signal, the needle and armature simultaneously descend and the needle-armature sequentially returns to its original position, and the fuel injection unit (1c) has a valve driving unit. This is the part where fuel is injected when opened and determines the flow rate and injection direction.

Therefore, the magnetic circuit driving unit (1b) includes a magnetic core (2), compression spring (3), stopper (4), damper spring (5), armature (6), needle bar (7), and position ring (8). do.

For example, the magnetic core 2 forms a magnetic circuit to generate magnetic force and controls the rise of the armature 6.

For example, the stopper 4 receives the impact force and magnetic force formed when the armature 6 rises to open the injector valve, and the armature 6 transmits the magnetic force to the stopper 4 to open the injector valve. The needle bar (7) opens the injector valve by receiving the impact force and magnetic force formed when the armature (6) rises.

For example, the compression spring (3) closes the injector valve by pushing the needle at the time of the injector closing, and the damper spring (5) prevents the bouncing formed by collision with the position ring (8) when the armature (6) is closed. The positioning ring (8) regulates the movement of the armature (6) at the time of injector valve closing.

Specifically, the armature chamber 10 operates to very effectively increase fluid resistance by having the outer diameter of the stopper 4 surrounded by the inner diameter of the armature 6, thereby increasing the expanded volume of the blocking passage compared to the open passage of the existing fluid film forming part. do.

Therefore, the injector (1) is characterized as an injector with improved armature behavior using the expanded volume of the armature chamber space, and this feature is that the kinetic energy formed when the armature rises in the injector with the opening behavior of the needle due to contact with the stopper (4) moves the needle. The phenomenon that is transmitted to the bar (position ring) and causes needle bouncing and unintended needle behavior can be minimized or eliminated, especially when the injector opening is formed by the stopper impact after the armature rises alone. The inertial force of the armature can be additionally utilized.

In particular, referring to FIGS. 1 and 2, the armature chamber 10 is a combination structure of the stopper lower protrusion 11 and the armature inner diameter portion 12, and the outer diameter of the stopper lower protrusion 11 is the armature inner diameter ( Surrounded by the inner diameter of 12), the stopper lower protrusion 11 extends a partial section at the bottom of the inner diameter with a stopper inner diameter inclined portion 11a formed on the inner diameter through which the needle bar 7 penetrates, and the stopper inner diameter inclined portion (11a) is directed outward at an acute angle, thereby expanding the stopper inner diameter and acting to increase the volume of the armature chamber 10 (i.e., fluid resistance gap (a)).

For this purpose, the stopper 4 is made up of a “T” cross-sectional shape with an upper flange forming a large diameter concentric circle on the upper part of the stopper lower protrusion 11, which has a hollow cylindrical shape, and the upper flange is the upper surface of the armature 6. In this case, the upper end of the damper spring (5) seated in surrounds the stopper lower protrusion (11) and is elastically supported in contact with the upper flange. ) The inner diameter is set in such a way that high-pressure fuel can flow into the space of the armature chamber 10 through a predetermined gap.

In particular, the armature inner diameter portion 12 of the armature 6 is formed with a groove depth A that maintains a constant fluid resistance gap a while receiving the stopper lower protrusion 11 of the stopper 4.

For example, the groove depth (A) is set to match the protrusion length of the stopper lower protrusion 11, and the fluid resistance gap (a) is set to about 0.25 to 0.35 with the groove depth (A) set to 1.

In particular, the 0.25 to 0.35 setting range is applied to reflect the elastic coefficient of the damper spring (5), which is compressed and deformed when the armature (6) moves upward, and through this, the armature chamber (10) is adjusted to the length of the stopper bottom protrusion of the stopper (4). After the groove depth (A) of the armature (6) is set, the size (i.e. depth) of the fluid resistance gap (a) can be adjusted by the elastic modulus of the damper spring (5).

Meanwhile, referring to FIG. 3, the operation of the armature chamber 10 is illustrated. In this case, the operation of the injector (1) occurs when the armature (6) is lifted when a magnetic force is generated by the solenoid, and the needle (i.e., needle bar (7)) is lifted by the magnetic force + armature impact force, and is closed when the current signal is cut off. At this point, the needle and armature descend simultaneously, and the needle-armature sequentially returns to its original position. This is explained by assuming that the basic operation is.

As shown, the injector 1 is operated in a state where the armature 6 and the positioning ring 8 are in contact before operation, and in this state, the armature groove 10 is located within the armature of the armature 6. A fluid resistance gap (a) is formed between the neck portion (12) and the stopper lower protrusion (11) of the stopper (4).

Then, in the classification of the rising 1 and 2 operations of the armature 6, the rising 1 operation generates kinetic energy as the armature 6 rises alone in a fixed state of the position ring 8, and at the same time, the armature 6 The rise of the stopper (4) narrows the gap to the stopper lower protrusion (11), thereby reducing the volume of the fluid resistance gap (a), and the volume reduction of the fluid resistance gap (a) of the armature chamber (10). By increasing the repulsive force of the fuel inside, an impact is generated on the stopper lower protrusion 11 of the stopper 4, resulting in a simultaneous upward action of the needle bar 7 and the armature 6.

Accordingly, in the rising 2 operation, an independent rise (i.e., overshoot) of the needle bar 7 occurs after the armature 6 is interrupted by the magnetic core 2, but ultimately the needle bar 7 is connected to the injector ( 1) is seated on the armature 6 after operation and ends its upward motion, thereby reducing the kinetic energy of the armature and thus reducing unintended movement (i.e., needle bouncing) of the needle bar 7. In this case, the special surface gap between the stopper lower protrusion 11 and the armature inner diameter 12 acts to gradually escape fluid as the volume of the fluid resistance gap (a) decreases.

As a result, the armature chamber 10 increases the fluid resistance compared to the shape of the existing fluid film forming part, thereby increasing the repulsive force of the fuel, and the movement formed in the armature 6 at the point of collision of the armature 6 with the stopper 4 It reduces the energy, and the reduced kinetic energy reduces the armature vibration.

As described above, the armature behavior improved injector (1) using the armature chamber (10) according to the present embodiment has an armature (6) located below the stopper (4) and a fluid resistance space (10) where fluid exists. is formed, and the fluid dissipates the armature kinetic energy by increasing the repulsion force as the fluid resistance gap (a) of the fluid resistance space (10) decreases in volume due to the rise of the armature (6), thereby causing unintended behavior of the needle. can be minimized, and in particular, the kinetic energy dissipation is maximized, so that when the injector is opened by the stopper impact after the armature rises alone, the inertial force of the armature is additionally utilized for the opening behavior, while the kinetic energy dissipation of the armature that causes needle behavior is reduced. In addition to being maximized, the needle bar overshoot height, which is a factor causing behavioral dispersion, can also be reduced.

1: Injector 1a: Fuel inlet
1b: Magnetic circuit driving part 1c: Fuel injection part
2: Magnetic core 3: Compression spring
4: Stopper 5: Damper spring
6: Armature 7: Needle Bar
8: Positioning ring 10: Armature chamber
11: Stopper bottom protrusion 11a: Stopper inner diameter inclined portion
12: Amateur internal cervix

Claims (8)

An armature chamber in which fluid exists is formed by the armature located below the stopper,
The fluid dissipates the armature kinetic energy by increasing the repulsive force due to a decrease in the volume of the armature chamber due to the rise of the armature.
An injector characterized in that.
The injector according to claim 1, wherein the armature chamber is formed by a stopper bottom protrusion of the stopper and an armature inner diameter portion of the armature.
The injector according to claim 2, wherein the inner diameter of the armature is dug to a predetermined groove depth on the upper surface of the armature to accommodate the lower protrusion of the stopper.
The injector according to claim 3, wherein the stopper bottom protrusion forms a fluid resistance gap at a distance from the armature inner diameter portion.
The injector according to claim 4, wherein the fluid resistance gap is reduced in volume to increase the repulsive force of the fluid when the armature rises.
The injector according to claim 5, wherein the fluid resistance gap is expanded in volume by an inclined portion of the inner diameter of the stopper formed on the inner diameter of the lower protrusion of the stopper.
The injector according to claim 2, wherein the stopper has a “T”-shaped cross-sectional shape to be resiliently supported by a damper spring surrounding the lower protrusion of the stopper.
The injector according to claim 7, wherein the damper spring is located beyond the inner diameter of the armature of the armature.