KR20240055423A - Armature Behavior Improvement type Injector using Fluid resistance Gab - Google Patents

Abstract

The armature behavior improved injector (1) using the fluid resistance gap of the present invention has a protruding height difference (B-A) due to a sealed coupling structure between the armature (6) and the positioning ring (8). ) between the fluid resistance gap (20-1, 20-2), where fluid resistance is generated by reduction of the volume space that dissipates the armature kinetic energy, and the impact surface where the armature (6) and the positioning ring (8) contact ( By forming 30-1, 30-2), the unintended movement of the needle can be minimized, and in particular, the fluid resistance chamber of the armature and position ring has a sealed structure when the injector operates, maximizing the fluid resistance within the chamber, causing needle movement. The feature of maximizing the kinetic energy dissipation of the armature is realized.

Description

Armature Behavior Improvement type Injector using Fluid resistance Gab}

The present invention relates to an injector, and particularly to an injector that absorbs kinetic energy in which armature behavior is improved by increasing fluid resistance through expansion of the fluid resistance gap volume by a combination of an armature and a position ring.

Generally, a fuel injection injector is required to reduce needle bouncing due to kinetic energy resulting from armature descent during operation.

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

In other words, 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 lowering), the space gap through which fluid inflows between the positioning ring and the armature due to the lowering of 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 lowering of the armature, which is transmitted to the needle bar (or positioning ring) at the closing point of the injector with an armature-needle bar decoupling type drive method and causes needle bouncing. It works as best as possible.

Japanese registered patent JP 5063789B (2012.08.17)

However, the fluid film forming part is not large enough for the fluid resistance generated by the inflow of fluid in the space gap (i.e. volume) between the positioning ring and the armature as the armature is lowered 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 consideration, the present invention can minimize the unintended movement of the needle by absorbing the kinetic energy formed when the armature falls as fluid resistance inside the valve, and in particular, expands the volume of the fluid resistance gap between the armature and the position ring. The purpose is to provide an injector with improved armature behavior using a fluid chamber that can maximize the dissipation of kinetic energy of the armature that causes needle behavior by maximizing the fluid resistance within the chamber through a sealed structure when the injector operates.

The injector of the present invention to achieve the above object is a fluid that dissipates armature kinetic energy through fluid resistance due to volume space reduction between the armature and the positioning ring, with a difference in protrusion height due to the combined structure of the armature and the positioning ring. It is characterized in that it forms a resistance gap and an impact surface where the armature and the position ring contact.

In a preferred embodiment, the protrusion height difference is when the protrusion height of the upper part of the positioning ring is smaller than the protrusion height of the lower part of the armature, the fluid resistance gap is formed from the inner space of the valve to the fluid inner space of the volume space for fluid storage, and the shock The surface is formed as an outer impact surface where the armature contacts the positioning ring in the space outside the valve.

In a preferred embodiment, the fluid inner space forms the volume space through a gap between an inner depression at the bottom of the armature of the armature and an inner protrusion at the top of the position ring of the position ring, and the outer impact surface is an outer protrusion at the bottom of the armature of the armature. A close contact is formed between the upper outer recessed portion of the position ring and the position ring.

In a preferred embodiment, the protrusion height difference is when the protrusion height of the upper part of the positioning ring is greater than the protrusion height of the lower part of the armature, the fluid resistance gap is formed from the space outside the valve to the fluid outer space of the volumetric space for fluid storage, The impact surface is formed as an inner impact surface where the armature contacts the position ring in the space inside the valve.

In a preferred embodiment, the fluid outer space forms the volumetric space through a gap between an outer protrusion at the bottom of the armature of the armature and an outer depression at the top of the position ring of the position ring, and the outer impact surface is an inner depression at the bottom of the armature of the armature. Forms close contact with the inner protrusion at the top of the position ring of the position ring.

In order to achieve the above object, the injector of the present invention is an armature in which the inner space is composed of an inner depression at the bottom of the armature and the outer space is an outer protrusion at the bottom of the armature, and the inner space is a positioning ring and the upper inner protrusion and the outer space are a positioning ring. A positioning ring consisting of an upper outer depression, a combination of an inner depression at the bottom of the armature and an inner protrusion at the top of the positioning ring to form a volumetric space, and dissipating armature kinetic energy through fluid resistance due to reduction of the volumetric space when the armature moves. It is characterized in that it includes a fluid resistance gap and an outer impact surface that is in close contact with the outer protrusion at the bottom of the armature and the outer recess at the top of the position ring.

In a preferred embodiment, the fluid resistance gap is formed when the protruding height of the lower armature of the armature is greater than the protruding height of the upper part of the position ring of the position ring.

In addition, the injector of the present invention to achieve the above object is an armature in which the inner space is composed of an inner depression at the bottom of the armature and the outer space is an outer protrusion at the bottom of the armature, and the inner space is a positioning ring and the upper inner protrusion and the outer space are a positioning ring. A positioning ring composed of an upper outer depression, forming a volumetric space by combining the lower outer protrusion of the armature and the upper outer depression of the positioning ring, and a fluid that dissipates armature kinetic energy through fluid resistance due to volumetric space reduction when the armature moves. It is characterized in that it includes a resistance gap and an inner impact surface that is in close contact with the inner depression at the bottom of the armature and the inner protrusion at the top of the position ring.

In a preferred embodiment, the fluid resistance gap is formed in a state where the protrusion height of the lower armature of the armature is smaller than the protrusion height of the upper end of the position ring of the position ring.

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 movement by absorbing the kinetic energy formed when the armature descends through the fluid resistance gap. Second, the fluid resistance gap, which reduces the kinetic energy formed in the armature at the point of collision, is formed in a sealed structure by the unevenness between the armature and the position ring, so that the sealed flow path effectively increases fluid resistance compared to the open flow path in the existing fluid film formation area. I can do it for you. Third, the vibration of the armature caused by positioning and collision is reduced due to the kinetic energy reduced through the fluid resistance gap. Fourth, under multi-stage injection conditions where fuel is injected more than twice in a very short period of time in one engine cycle, the dispersion between each injection is reduced.

Figure 1 is a configuration diagram of an injector with improved armature behavior using a fluid resistance gap according to the present invention, and Figure 2 shows the fluid resistance gap using a position ring and an armature according to the present invention as an inner fluid resistance gap and an outer fluid resistance gap. This is an example consisting of, and Figure 3 shows the operating state of the inner fluid resistance gap among the fluid resistance gaps according to the present invention.

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 injector 1 has a fluid resistance gap 10 that acts to reduce the kinetic energy of the armature by absorbing the kinetic energy of the armature through fluid resistance inside the valve during operation of the injector, and has a fuel inlet portion 1a and a magnetic circuit drive portion 1b. ) and the magnetic circuit driving unit (1b) of the fuel injection unit (1c). In this case, the injector 1 is a gasoline high-pressure injector driven by a solenoid.

In particular, the fluid resistance gap 10 is formed in a sealed structure in which the protrusion on the outer side of the lower surface of the armature and the inner diameter thereof are surrounded by the outer diameter of the position ring, thereby very effectively increasing the fluid resistance with an increased blocking passage compared to the open passage of the existing fluid film forming part. It works to lose.

Therefore, the injector 1 is characterized as an injector with improved armature behavior using a fluid resistance gap, and this feature is that in an armature-needle bar decoupling type drive injector, the kinetic energy formed when the armature falls at the time of injector closing is transferred to the needle bar ( Positioning ring), which causes needle bouncing and unintended needle behavior, can be minimized or eliminated.

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 unit 1b is a solenoid type that generates spring force (i.e., restoring force) and constitutes a magnetic circuit, which generates magnetic force with power supply and magnetic force. It consists of a valve drive unit that causes fuel injection and airtightness by generating spring force (i.e., restoring force). The fuel injection unit (1c) is a part that injects fuel as the valve drive unit opens, and controls the flow rate and injection direction. decide

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 fluid resistance gap 10 consists of inner recessed/outer protruding parts 11 and 12 at the bottom of the armature and inner protruding/outer recessed parts 14 and 15 at the top of the positioning ring.

For example, the inner depression/outer protrusions 11 and 12 at the bottom of the armature are formed in the lower part of the armature 6, and the inner space at the lower part of the entire diameter of the lower part is formed at the inner bottom of the armature in a concave shape. It is divided into a depression (11) and an outer protrusion (12) at the bottom of the iron armature with a protruding structure in the space outside it.

For example, the inner protrusion/outer recesses 14, 15 at the top of the position ring are formed in the upper part of the position ring 8, and the inner space of the entire diameter of the upper part is made of iron [convexity] with a protruding structure. It is divided into an inner protrusion 14 at the top of the positioning ring and an outer recess 15 at the top of the positioning ring, which has a concave structure in which the outer space is a depression.

In particular, in terms of layout, the closed coupling structure of the fluid resistance gap 10 is set to the height relationship as follows.

Height relationship: (1) Protrusion height of the lower part of the armature (B) > Protrusion height of the upper part of the positioning ring (A) or (2) Protrusion height of the lower part of the armature (B) < Protrusion height of the upper part of the positioning ring (A)

Here, the protrusion height (A) of the upper part of the positioning ring is the height of the inner protrusion (14) of the upper part of the positioning ring with respect to the outer depression (15) of the upper part of the positioning ring, and the protrusion height (B) of the lower armature is the outer protrusion of the lower part of the armature ( 12) is the height of the inner depression 11 at the bottom of the armature.

Therefore, the fluid resistance gap 10 is a combination of the fluid resistance inner gap 20-1 and the outer impact surface 30-1 in the relationship between the protrusion height of the upper part of the positioning ring (A) and the protrusion height of the lower part of the armature (B). A configuration (see FIG. 2) or a combination configuration of the fluid resistance outer gap 20-2 and the inner impact surface 30-2 (see FIG. 2) can be applied.

Referring to FIG. 2, when the fluid resistance gap 10 is a combination of the fluid resistance inner gap 20-1 and the outer impact surface 30-1, the protrusion height of the upper part of the positioning ring (B) is higher than the protrusion height of the lower part of the armature (B). As A) is small, the fluid resistance inner gap (20-1) forms a volumetric space for fluid storage through the gap (B-A) between the inner depression at the bottom of the armature (11) and the inner protrusion at the top of the positioning ring (14). The outer impact surface 30-1 forms an armature-position ring impact surface through close contact (B-A=0) of the outer protrusion 12 at the bottom of the armature and the outer depression 15 at the top of the position ring.

On the other hand, in Figure 2, when the fluid resistance gap 10 is a combination of the fluid resistance outer gap 20-2 and the inner impact surface 30-2, the protrusion height of the upper part of the positioning ring (A) is higher than the protrusion height of the lower part of the armature (B). ) is large, so that the fluid resistance outer gap (20-2) forms a volumetric space for fluid storage through the gap (B-A) between the armature lower outer protrusion 12 and the positioning ring upper outer recess 15, while the inner The impact surface 30-2 forms an armature-position ring impact surface through close contact (B-A=0) of the armature lower inner depression 11 and the positioning ring upper inner protrusion 14.

From this, the fluid resistance gap 10 can form a closed coupling structure of the fluid resistance inner gap 20-1 and the outer impact surface 30-1 in the inner space of the valve, while the fluid resistance outer gap 20-1 2) and a closed coupling structure of the inner impact surface (30-2) can be formed in the space outside the valve.

Therefore, the change in the layout of the fluid resistance gap 10 enables the formation of an impact surface on the outside of the armature-position ring or the formation of an impact surface on the inside of the armature-position ring.

Meanwhile, referring to Figure 3, the fluid resistance gap 10 is a fluid resistance inner gap 20-1, which forms a fluid volume space (B-A) in the inner space of the valve, while the outer impact surface 30-1 forms a space outside the valve. An example is given where an impact surface is formed on the outer side of the armature-position ring.

Hereinafter, the operation of the injector (1) occurs when the magnetic force is generated by the solenoid, the armature (6) is lifted, the needle is lifted (i.e., the needle bar (7)) by the magnetic force + armature impact force, and the injector (1) is closed when the current signal is cut off. At this point, the needle and the armature are simultaneously lowered, causing sequential restoration of the needle and armature, and the basic operation is assumed to be that first bouncing is formed when the needle is lowered and second bouncing is formed when the armature is closed.

As shown, if the fluid resistance inner gap 10 is operated from a state in which it is not formed by contact between the armature 6 and the positioning ring 8 before operation of the injector, the inner bottom of the armature is depressed during operation in which the armature is lowered. As the portion 11 approaches the upper inner protrusion 14 of the positioning ring, the fluid (i.e., high-pressure fuel inside the valve) in the volume of the fluid resistance inner gap 20-1 generates fluid resistance.

Then, since the fluid is trapped in a closed coupling structure, the fluid resistance is maximized due to volume reduction, and as the volume reduction progresses, the pressure of the compressed fuel further increases, thereby maximizing the absorption and dissipation of the kinetic energy possessed by the armature 6. .

As a result, after the injector operates, the kinetic energy transmitted to the positioning ring 8 from the armature 6 is reduced, so unintentional movement of the needle bar 7 (i.e., needle bouncing) is reduced.

As described above, the armature behavior improved injector (1) using the fluid resistance gap according to the present embodiment has a protrusion height difference (B-A) due to the sealed coupling structure of the armature (6) and the positioning ring (8). A fluid resistance gap (20-1, 20-2) in which fluid resistance is generated by reducing the volume space that dissipates the armature kinetic energy between the armature kinetic energy (6) and the positioning ring (8), and the armature (6) and the positioning ring (8) ) can minimize the unintentional movement of the needle by forming an impact surface (30-1, 30-2) in contact with the By maximizing , the kinetic energy dissipation of the armature that causes needle movement can be maximized.

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: Fluid resistance gap
11: Inner depression at the bottom of the armature
12: Armature bottom outer protrusion
14: inner protrusion at the top of the positioning ring
15: External depression at the top of the positioning ring
20-1: Body resistance inner gap 20-2: Fluid resistance outer gap
30-1: Outer impact surface 30-2: Inner impact surface

Claims (9)

The difference in protrusion height due to the combined structure of the armature and positioning ring,
A fluid resistance gap that dissipates armature kinetic energy through fluid resistance caused by volume space reduction between the armature and the positioning ring, and
Impact surface where the armature and the positioning ring contact
An injector characterized in that it includes.
The method according to claim 1, wherein the protrusion height difference is when the protrusion height of the upper part of the positioning ring is smaller than the protrusion height of the lower part of the armature,
The fluid resistance gap is formed as a fluid resistance inner gap of a volumetric space for fluid storage in the space inside the valve,
The injector is characterized in that the impact surface is formed as an outer impact surface where the armature contacts the position ring in a space outside the valve.
The method according to claim 2, wherein the fluid resistance inner gap forms the volume space through a gap between the armature lower inner depression of the armature and the upper inner protrusion of the positioning ring of the positioning ring,
The injector, characterized in that the outer impact surface forms close contact with the armature lower outer protrusion of the armature and the upper outer recess of the position ring of the position ring.
The method according to claim 1, wherein the protrusion height difference is when the protrusion height of the upper part of the positioning ring is greater than the protrusion height of the lower part of the armature,
The fluid resistance gap is formed as the fluid resistance outer gap of the volumetric space for fluid storage in the space outside the valve,
The injector is characterized in that the impact surface is formed as an inner impact surface where the armature contacts the position ring in a space inside the valve.
The method according to claim 4, wherein the fluid resistance outer gap forms the volume space through a gap between the armature lower outer protrusion of the armature and the upper outer depression of the position ring of the position ring,
The injector, characterized in that the outer impact surface forms close contact with the armature lower inner depression of the armature and the upper inner protrusion of the positioning ring of the positioning ring.
An armature where the inner space is the inner depression at the bottom of the armature and the outer space is the outer protrusion at the bottom of the armature.
A position ring made up of the inner protrusion at the top of the position ring as the inner space and the outer depression at the top of the position ring as the outer space.
A fluid resistance inner gap that forms a volumetric space by combining the lower inner depression of the armature and the upper inner protrusion of the positioning ring, and dissipates armature kinetic energy through fluid resistance due to the reduction of the volumetric space as the armature moves, and
The outer impact surface is in close contact with the outer protrusion at the bottom of the armature and the outer recess at the top of the positioning ring.
An injector comprising: An injector characterized in that.
The injector according to claim 6, wherein the fluid resistance inner gap is formed in a state where the protruding height of the lower armature of the armature is greater than the protruding height of the upper part of the positioning ring of the positioning ring.
An armature where the inner space is the inner depression at the bottom of the armature and the outer space is the outer protrusion at the bottom of the armature.
A position ring made up of the inner protrusion at the top of the position ring as the inner space and the outer depression at the top of the position ring as the outer space.
A fluid resistance outer gap that forms a volume space by combining the outer protrusion at the bottom of the armature and the outer depression at the top of the positioning ring, and dissipates armature kinetic energy through fluid resistance due to reduction of the volume space that is reduced by movement of the armature, and
The inner impact surface is in close contact with the inner depression at the bottom of the armature and the inner protrusion at the top of the positioning ring.
An injector characterized in that it includes.
The injector according to claim 8, wherein the fluid resistance outer gap is formed in a state where the protruding height of the lower armature of the armature is smaller than the protruding height of the upper part of the positioning ring of the positioning ring.