KR102604771B1 - Eccentric Needle type Injector - Google Patents

Abstract

The eccentric needle-type injector (1) of the present invention is a valve seat ( A pressure difference is formed at both ends of the ball 35 by one of the asymmetric flow path 31, the triangular asymmetric flow path 37, and the radial asymmetric flow path 39 associated with the ball hole of 33), and the pressure difference is generated by the ball 35. By inducing the movement of the ball to one-way horizontal behavior, the random wobbling of the ball is improved by stabilizing the horizontal movement of the needle bar and ball due to the circumferential gap that is inevitable during processing with the asymmetric flow path structure, and especially the flow rate due to the asymmetric flow path. A pressure difference is formed between both ends of the ball due to the difference, realizing the feature of being able to induce horizontal behavior in the set direction without the influence of dispersion of parts during processing when the needle bar rises.

Description

Eccentric Needle type Injector}

The present invention relates to injectors, and particularly to an eccentric needle-type injector in which the influence of the circumferential gap on needle behavior is improved through a valve seat eccentric guide structure.

In general, vehicle injectors allow the engine to run by injecting fuel into the engine.

For example, among the injectors, a gasoline high-pressure injector is composed of a solenoid, a magnetic circuit part, and an injector moving part. In this case, the magnetic circuit components include a magnetic core and an armature, and the injector moving part components include a compression/damper spring, stopper, positioning ring, and needle bar.

Therefore, the gasoline high-pressure injector is driven by a solenoid, magnetic circuit components form the magnetic force necessary to drive the injector, and injector moving parts move the needle bar to achieve fuel injection.

US registered patent US 10415526 B2

However, the injector has a fundamental problem that by applying a valve seat coaxial guide type drive method, a gap is generated in the circumferential direction when the valve seat and the ball are assembled due to processing problems of the injector parts, and this cannot be reduced.

In particular, the circumferential gap inevitably causes horizontal movement due to the nature of the movement of the needle bar (i.e., ball) that moves up and down when the solenoid valve is driven.

Accordingly, taking the above into consideration, the present invention has an asymmetric flow path structure to improve random ball wobbling by stabilizing the horizontal movement of the needle bar and ball due to the circumferential gap that is inevitable during processing, and in particular, to improve the stability of the ball due to the asymmetric flow path. The purpose is to provide an eccentric needle-type injector that is capable of inducing horizontal movement in the set direction without the influence of dispersion of parts during processing when the needle bar rises by forming a pressure difference between the two ends of the ball due to the difference in flow rate.

The eccentric needle-type injector of the present invention for achieving the above object includes a valve seat that accommodates a ball in a ball hole in contact with a needle bar that opens the valve with an upward movement; and an eccentric needle portion that forms a pressure difference between both ends of the ball using fluid pressure caused by fuel flowing in from the inner space of the valve seat, and the pressure difference induces the movement of the ball 35 into a one-way horizontal movement. It is characterized by

In a preferred embodiment, the one-way horizontal movement forms a guiding direction so that the ball contacts the inner space surface of the valve seat, and the guiding direction is the shaking of the ball 35 generated by the circumferential gap in the inner space. It suppresses wobbling.

In a preferred embodiment, the eccentric needle portion forms the pressure difference in one of an asymmetric flow path, a triangular asymmetric flow path, and a radial asymmetric flow path.

In a preferred embodiment, the asymmetric flow path is made of an eccentric hole that expands the upper section area of the ball hole and forms an offset distance with the ball hole, and the offset distance is defined by the central axis of the needle bar of the eccentric hole and the ball. It is formed by the distance difference between the center axes of the valve seats in the hole.

In a preferred embodiment, the asymmetric flow path forms a guide surface that guides the upward movement of the ball to the lower section area of the eccentric hole and the ball hole from the opposite side to the upper section area.

In a preferred embodiment, the triangular asymmetric flow path consists of a main groove drilled in one side of the ball hole, a first rear groove and a second rear groove drilled in the other side of the ball hole, and the main groove is the first rear groove and the second rear groove. The pressure difference is made larger than that of the second rear groove, and the gap between the first rear groove and the second rear groove is formed as a guide surface that guides the upward movement of the ball.

In a preferred embodiment, the radial asymmetric flow path includes a main groove cut in one side of the ball hole, a first rear groove and a second back groove cut in the other side of the ball hole, and a first intermediate groove cut in the middle of the ball. and a second intermediate groove, wherein the main groove forms a greater pressure difference than the first intermediate groove and the second intermediate groove, and the first intermediate groove and the second intermediate groove are formed with the first rear groove. and the pressure difference is made larger than that of the second rear groove, and the gap between the first rear groove and the second rear groove is formed as a guide surface that guides the upward movement of the ball.

In a preferred embodiment, the valve seat is coupled to the end of the injector lower body surrounding the needle bar.

In a preferred embodiment, the injector lower body is connected to an injector upper body surrounding a magnetic circuit portion in which a magnetic force that moves the needle bar is generated, and the injector upper body and the injector lower body are combined into a housing.

The eccentric needle-type injector of the present invention implements the following actions and effects.

First, even if the injector is manufactured through a machining process that inevitably forms a circumferential gap due to dispersion of parts, the left/right shaking of the needle can be improved. Second, by improving the horizontal behavior of the needle bar and ball due to the circumferential gap into an asymmetric flow path, the existing flow path structure can be utilized to the fullest extent to improve injector performance. Third, because the asymmetric flow path applies fluid force in a designated direction, it is possible to form a more stable guide than the existing symmetric flow path when the needle bar (ball) rises. Fourth, the asymmetric flow path absorbs manufacturing dispersion that causes random ball wobbling, thereby preventing an increase in flow rate/dispersion between injections, and in particular, stable needle (ball) behavior is induced to ensure optimal stability between each injection/product. Flow rate/spray dispersion can be reduced.

Figure 1 is a configuration diagram of an eccentric needle-type injector according to the present invention, Figure 2 is a state in which the ball is induced to move horizontally in a set direction through an asymmetric flow path formed by the eccentric needle part of the eccentric needle-type injector according to the invention, Figure 3 is an example of a modified asymmetric flow path of the eccentric needle portion 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 may 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 includes an eccentric needle portion 30 located in the moving portion 20 associated with the magnetic circuit portion 10. In this case, the injector (1) includes a valve seat (33) and a ball (35) coupled to the end of the injector lower body (3b) among the injector upper body (3a) and the injector lower body (3b) surrounded by the housing (5). Position the eccentric needle part (30) at the joining area. In particular, the valve seat 9 injects fuel from the injection hole opened by the movement of the ball 7 built therein.

Specifically, the eccentric needle part 30 consists of an asymmetric flow path 31 and a guide surface 32. In this case, the asymmetric flow path 31 is filled with fuel from an existing fuel line (not shown) inside the valve, thereby injecting fuel according to the behavior of the ball 35 in the valve seat 33.

For example, referring to the horizontal cross-sectional view of the eccentric needle portion, the asymmetric flow path 31 is formed directly on the inner diameter of the valve seat 33 in a dual structure of an eccentric hole and a ball hole forming a circle about the hole vertical center line (O-O), The needle bar central axis (A-A) of the eccentric hole and the valve seat central axis (B-B) of the ball hole form a predetermined offset distance, so that the eccentric hole is biased to one side with respect to the ball hole. In this case, the ball hole is a basic component of the valve seat 33 that accommodates the ball 35.

In particular, the offset interval is set differently for each injector specification because it is adjusted to the level at which the horizontal movement of the needle bar 25 and the ball 35 is reduced. In this case, the offset interval is the distance between the needle bar central axis (A-A) and the valve seat central axis (B-B).

Therefore, in terms of the layout of the asymmetric flow path 31, an offset gap is formed by the distance between the needle bar central axis (A-A) of the eccentric hole and the valve seat central axis of the ball hole, and the offset gap is on the eccentric hole side compared to the ball hole. By allowing more fuel to enter the valve seat 33, the eccentric hole flow rate can act as a fluid pressure in a certain direction with respect to the ball 35.

For example, the guide surface 32 is formed using a half section where the eccentric hole of the asymmetric flow path 31 coincides with the ball hole of the valve seat 33.

That is, if the eccentric hole of the asymmetric flow path 31 is divided into a 360° circular section and an upper half section of 180° and a lower half section of 180°, the upper half section of 180° is due to the effect of the offset interval. While it is inconsistent with the upper half section of the ball hole, the lower half section of 180° is consistent with the lower half section of the ball hole because there is no effect of the offset gap.

Therefore, the guide surface 32 is formed to be biased toward one side of the asymmetric flow path 31.

Specifically, the magnetic circuit unit 10 includes a magnetic core 11 and an armature 13 and is surrounded by the injector upper body 3a and connected to the power supply unit.

For example, the magnetic core 11 forms a magnetic circuit to form a magnetic force, forms a passage through which fuel passes, and controls the rise of the armature 13. In addition, the armature 13 forms a magnetic circuit to form a magnetic force, forms a passage through which fuel passes, and transfers the magnetic force to the needle bar 25 (i.e., stopper) of the moving part 20 to open the injector valve.

Therefore, the magnetic circuit unit 10 has the same configuration as the magnetic circuit unit of a general injector.

Specifically, the moving part 20 is surrounded by the injector lower body 3b, which includes the position ring 24 and the needle bar 25 and is connected to the injector upper body 3a, and is connected to the fuel line.

For example, the position ring 24 controls the movement of the armature 13 when the injector is closed, and the needle bar 25 receives the impact force and magnetic force formed when the armature 13 rises to open the injector valve.

In particular, the moving part 20 includes a compression spring that closes the valve by pushing the needle bar 25 at the time of injector closing, a stopper that opens the injector valve by receiving the impact force and magnetic force formed when the armature 13 rises, and an armature ( 13) includes a damper spring as a component that reduces bouncing formed by collision with the position ring 24 when closed.

Therefore, the moving part 20 has the same structure as the moving part of a general injector. However, the moving part 20 moves the needle bar 25 together with the ball 35 built into the valve seat 33, thereby providing a pressure difference and guide through an asymmetric flow path 31 formed at both ends of the ball 35. There is a difference in that it is linked to the eccentric needle portion 30, which guides the upward movement by the surface 32.

Meanwhile, Figure 2 shows the action and effect generated by the eccentric needle portion 30 in the operating state of the injector 1.

As shown, the injector 1 operates to open and close the valve by magnetizing the solenoid (i.e., magnetic circuit 10) inside the valve, and the inside of the injector upper and lower bodies 3a and 3b. The fuel supplied through the fuel line (not shown) formed in is sent to the valve seat 33 provided at the end of the injector lower body 3b, and fuel is injected when the valve is opened.

In the fuel injection operation due to the upward movement of the needle bar 25 and the ball 35, the eccentric needle portion 30 is the eccentricity of the asymmetric flow path 31 forming the offset gap with the ball hole of the valve seat 33. A flow rate difference is generated by the hole flow path, and the flow rate difference acts as fluid pressure (F), causing the needle bar 25 and the ball around the ball 35 or the end of the needle bar 25 and the ball 35. A pressure difference is formed between both ends of (35).

Then, the eccentric hole flow rate of the single asymmetric flow path 31 acts as a constant pressure on the ball 35 seated in the ball hole of the valve seat 33, even if there is dispersion during component manufacturing when the needle bar 25 rises. The horizontal movement of the needle bar 25 and the ball 35 can be guided in a given direction regardless.

As a result, the ball 35 is always in contact with the guide surface 32 formed in one direction due to horizontal movement in a predetermined direction, so that the guide direction of the needle bar 25 and the ball 35 can be maintained the same for each fuel injection. there is.

In this way, the injector (1) is an eccentric needle unit that prevents the horizontal movement of the needle bar (25) and the ball (35), which is inevitably generated due to the circumferential gap that occurs during the manufacture of the ball (35) of the valve seat (33). It is characterized as an eccentric needle-type injector (1) by stabilizing the fluid pressure (F) by the pressure difference between both ends of the ball by the asymmetric flow path (31) of (30).

From this, the eccentric needle-type injector (1) blocks the phenomenon of random ball wobbling, which occurs in existing manufacturing dispersions, from increasing the dispersion between flow rates/injections, and in particular, increases the flow rate/spray between each injection/product. Dispersion can be reduced by inducing stable behavior of the needle bar (25) and ball (35).

Meanwhile, Figure 3 shows that the asymmetric flow path 31 of the eccentric needle portion 30 is transformed into a triangular asymmetric flow path 37 or a radial asymmetric flow path 39 due to an asymmetric structural change.

Specifically, the triangular asymmetric flow path 37 consists of a main groove 37-1 and first and second rear grooves 37A and 37B.

For example, the main groove 37-1 is dug in an oval or circular shape from one side (i.e., left section) of the ball 35 to the outside of the ball hole to form an expansion space to the left of the hole, and the first and second rear The grooves 37A and 37B are dug in an oval or circular shape from the other side (i.e., right section) of the ball 35 to the outside of the ball hole to form an expansion space on the right side of the hole.

Furthermore, the first rear groove 37A and the second rear groove 37B are spaced apart from each other. In this case, the spacing is formed by a guide surface 32 that contacts the ball 35 and guides its upward movement.

In particular, the size of the first rear groove (37A) and the second rear groove (37B) is smaller than the size of the main groove (37-1), and the total capacity of the first and second rear grooves (37A, 37B) The domain is formed to be smaller than the capacity of the main groove (37-1).

From this, the triangular asymmetric flow path 37 is formed in a triangular structure with the main groove 37-1 as the vertex and the first and second rear grooves 37A, 37B as the base, and the main groove 37-1 and the first and second rear grooves 37A and 37B form a pressure difference between both ends of the needle bar 25 and the ball 35. In this case, the pressure difference is formed to push the ball 35 toward the first and second rear grooves 37A and 37B so that it comes into close contact with the guide surface 32.

For example, the radial asymmetric flow path 39 consists of a main groove 39-1, first and second rear grooves 39A and 39B, and first and second intermediate grooves 39C and 39D.

For example, the main groove 39-1 is dug in an oval or circular shape from one side (i.e., left section) of the ball 35 to the outside of the ball hole to form an expansion space to the left of the hole, and the first and second rear The grooves 39A and 39B are dug in an oval or circular shape from the other side (i.e., right section) of the ball 35 to the outside of the ball hole, thereby forming an expansion space on the right side of the hole.

In addition, the first and second intermediate grooves 39C and 39D are dug in an oval or circular shape from the middle portion of the ball 35 (i.e., the section between the left and right sides) to the outside of the ball hole to form an expansion space above and below the hole. give.

Furthermore, the first rear groove 39A and the second rear groove 39B are spaced apart from each other. In this case, the spacing is formed by a guide surface 32 that contacts the ball 35 and guides its upward movement.

In particular, the size of the first rear groove (39A) and the second rear groove (39B) is smaller than the size of the main groove (39-1), and the total capacity of the first and second rear grooves (39A, 39B) The domain is formed to be smaller than the capacity of the main groove (39-1). On the other hand, the size of the first intermediate groove (39C) and the second intermediate groove (39D) is smaller than the size and capacity of the main groove (39-1), but the size and capacity of the first and second rear grooves (39A, 39B) formed larger.

From this, the radial asymmetric flow path 39 includes the main groove 39-1, the first rear groove 39A, the second rear groove 39B, the first intermediate groove 39C, and the second intermediate groove 39D. It is formed in a radial structure in ball holes in which balls 25 are spaced apart from each other, and includes the main groove 39-1, the first and second rear grooves 39A and 39B, and the first and second intermediate grooves 39C, The fluid pressure difference formed by 39D) creates a pressure difference between both ends of the needle bar 25 and the ball 35. In this case, the pressure difference is formed to push the ball 35 toward the first and second rear grooves 39A and 39B so that it comes into close contact with the guide surface 32.

As described above, the eccentric needle-type injector 1 according to this embodiment has a ball 35 in contact with the needle bar 25 of the moving part 20, which opens the valve by movement by the magnetic force of the magnetic circuit part 10. ) forms a pressure difference at both ends of the ball 35 with one of the asymmetric flow path 31, the triangular asymmetric flow path 37, and the radial asymmetric flow path 39 associated with the ball hole of the valve seat 33, wherein The pressure difference induces the movement of the ball 35 into one-way horizontal behavior, and the asymmetric flow path structure stabilizes the horizontal movement of the needle bar and ball due to the inevitable circumferential gap during processing, thereby improving random ball wobbling. , In particular, a pressure difference is formed between both ends of the ball due to the difference in flow rate due to the asymmetric flow path, making it possible to induce horizontal behavior in the set direction without the influence of dispersion of parts during processing when the needle bar rises.

1: injector
3a, 3b: Injector upper/lower body 5: Housing
10: magnetic circuit unit
11: magnetic core 13: armature
20: moving part
24: position ring 25: needle bar
30: Eccentric needle part
31: Asymmetric flow path 32: Guide surface
33: valve seat 35: ball
37: Triangular asymmetric flow path
37-1,39-1: Main groove 37A,37B,39A,39B: 1st, 2nd rear groove
39: Radial asymmetric flow path 39C, 39D: 1st and 2nd middle grooves

Claims (16)

A valve seat that accommodates a ball in a ball hole in contact with a needle bar that opens the valve with an upward movement; and
A pressure difference is formed between both ends of the ball by fluid pressure caused by fuel flowing in from the inner space of the valve seat, and the pressure difference includes an eccentric needle portion that induces movement of the ball in a one-way horizontal motion,
The eccentric needle portion forms the pressure difference in one of an asymmetric flow path, a triangular asymmetric flow path, and a radial asymmetric flow path, and the asymmetric flow path is an eccentric hole extending an upper section area of the ball hole.
The injector according to claim 1, wherein the one-way horizontal movement forms a guiding direction so that the ball contacts the inner space surface of the valve seat.
The injector according to claim 2, wherein the guiding direction suppresses wobbling of the ball caused by a circumferential gap in the internal space.
delete delete The injector according to claim 1, wherein the eccentric hole of the asymmetric flow path forms an offset distance from the ball hole.
The injector according to claim 6, wherein the offset interval is formed by a distance difference between the central axis of the needle bar of the eccentric hole and the central axis of the valve seat of the ball hole.
The injector according to claim 1, wherein the asymmetric flow path forms a guide surface that guides the upward movement of the ball to the lower section area of the eccentric hole and the ball hole from the opposite side to the upper section area.
The injector according to claim 1, wherein the triangular asymmetric flow path includes a main groove drilled on one side of the ball hole, and a first rear groove and a second rear groove drilled on the other side of the ball hole.
The injector according to claim 9, wherein the main groove of the triangular asymmetric flow path creates a greater pressure difference than the first rear groove and the second rear groove.
The injector according to claim 9, wherein a gap between the first rear groove and the second rear groove is formed by a guide surface that guides the upward movement of the ball.
The method according to claim 1, wherein the radial asymmetric flow path includes a main groove cut in one side of the ball hole, a first rear groove and a second rear groove cut in the other side of the ball hole, and a first intermediate groove cut in the middle of the ball. An injector characterized in that it consists of a second intermediate groove.
The method of claim 12, wherein the main groove of the radial asymmetric flow path creates a greater pressure difference than the first intermediate groove and the second intermediate groove,
The injector is characterized in that the first intermediate groove and the second intermediate groove form a greater pressure difference than the first rear groove and the second rear groove.
The injector according to claim 12, wherein a gap between the first rear groove and the second rear groove is formed by a guide surface that guides the upward movement of the ball.
The injector according to claim 1, wherein the valve seat is coupled to an end of the injector lower body surrounding the needle bar.
The method of claim 15, wherein the injector lower body is connected to an injector upper body surrounding a magnetic circuit portion in which a magnetic force that moves the needle bar is generated,
An injector, characterized in that the injector upper body and the injector lower body are combined into a housing.