KR20150046654A - Inlector for Internal Combustion Engines - Google Patents

Abstract

According to an embodiment, the present invention relates to an injector for an internal combustion engine and, more specifically, to an injector installed on an internal combustion engine used for a vehicle to inject a fuel to a cylinder combustion chamber. According to an embodiment, the injector facilitates the flow of the fuel. According to an embodiment, the injector includes a valve seat having a structure to reduce production costs of a filter installed on the upper surface of the valve seat, thereby reducing production costs of the injector.

Description

Injector for Internal Combustion Engines

An embodiment of the present invention relates to an injector for an internal combustion engine. And more particularly, to an injector provided in an internal combustion engine used in a vehicle or the like to inject fuel into a cylinder combustion chamber.

The contents described in this section merely provide background information on the embodiment of the present invention and do not constitute the prior art.

Generally, an injector of an internal combustion engine for a vehicle injects fuel whose discharge amount or the like is controlled by the control of an electronic control unit (ECU) of a controller such as a vehicle.

The electronic control unit of the vehicle is provided with various data from sensors such as a crank angle sensor for detecting various data, an air flow meter for detecting the flow rate of air, an oxygen sensor for detecting the oxygen amount in the exhaust gas and the like, The temperature of the engine, the rotation speed of the engine, the concentration of oxygen in the exhaust gas, and the like, determines the running state of the vehicle, the fuel state in the cylinder, and the like, and then calculates the fuel discharge amount of the injector by calculating the optimum air-fuel ratio.

The structure of such an electronically controlled injector is generally composed of a housing, a solenoid coil installed inside the housing and magnetized by a control signal of the electronic control unit, an armature moving up and down by the magnetization of the solenoid coil, A needle valve is attached to one end of the needle, and a valve seat formed with a valve hole is coupled to the bottom of the housing, so that the valve hole of the valve seat is opened and closed by the upward and downward movement of the ball valve, .

The fuel injection amount is determined by the opening time of the needle, that is, the energization time of the solenoid coil.

On the other hand, the structure of the conventional valve seat is formed such that the fuel inside the injector flows on the inner surface of the valve seat, but this structure has a disadvantage that the fuel can not flow smoothly.

In addition, the injector may remain foreign matter even after it is manufactured. Such a foreign matter may be generated even when the cleaning operation is performed in the manufacturing process of the injector, and may be caused by, for example, the inside of the injector being worn out during repetitive injection of the high-pressure fuel at a high temperature.

If such a foreign matter flows into the combustion chamber inside the cylinder, the performance and durability of the engine are adversely affected. Therefore, in order to block the entry of foreign matter into the combustion chamber, a filter is installed in the passage inside the injector. In the structure of the conventional valve seat, it is difficult to install a filter on the upper surface of the valve seat. The dimensions of the filter must be made very precisely, which raises the manufacturing cost.

Accordingly, an embodiment of the present invention provides an injector including a valve seat having a new flow path structure in which a flow of fuel can be smoothly performed, in order to solve the above-mentioned problems.

The technical object of the present invention is not limited to the above-mentioned technical objects and other technical objects which are not mentioned can be clearly understood by those skilled in the art from the following description will be.

The injector for an internal combustion engine according to an embodiment of the present invention may include a housing and a solenoid disposed inside the housing to form a magnetic field in accordance with a control signal of the controller and to move the armature up and down through the magnetic field.

Also, it may include a needle having a ball valve at its end, connected to the armature, and moving up and down with the armature.

The ball valve may include a ball valve installed at an end of the needle and vertically moving together with the needle to open and close the flow path.

The valve seat may include a valve seat having a top surface, a seating portion on which the ball valve is seated during movement in a downward direction, and a flow passage hole passing through the inside and connecting the top surface and the inside portion.

The filter may further include a filter provided on the upper end surface of the valve seat to filter out foreign matter passing through the passage hole.

According to the embodiment, six flow holes may be formed.

The flow passage hole may be formed so as to approach the longitudinal axis of the injector from the upper end to the lower end.

One end of the passage hole may be connected to the upper surface and the other end may be connected to the seat part.

The one end and the other end of the flow passage hole may be connected by a straight line.

The filter may be installed to cover the one end of the flow path hole.

Wherein the seat portion includes a seating surface on which the ball valve is seated, a circumferential surface having one end connected to the upper surface of the valve seat and the other end connected to the seating surface, have.

The seating surface may include a conical first seating surface formed at a central portion and a second seating surface connected to the first seating surface at a predetermined angle.

The valve hole may be formed to be away from the longitudinal axis of the injector as it goes from the upper end to the lower end.

The inner diameter formed by the circumferential surface may be smaller than the diameter of the ball valve so that the ball valve does not move laterally when the ball valve is inserted.

The filter is in the form of a disk having an inner diameter, and a portion of the filter adjacent to the inner diameter can contact the upper surface of the valve seat.

The internal combustion engine according to another embodiment of the present invention may be configured to include the above-described injector.

According to another aspect of the present invention, there is provided a valve seat for an injector, which is installed at a lower end of a housing of an injector installed in an internal combustion engine, and which opens and closes a flow path by interacting with a ball valve, .

Further, it may include a circumferential surface to be press-fitted into the housing.

And a seating part formed in a shape such that a central part of the top surface is recessed, and in which the ball valve is seated and at least one valve hole is formed in the bottom surface.

And a plurality of inflow holes formed between a first rim connected to the seating portion of the upper surface and a second rim connected to the circumferential surface.

And a flow hole connected to the inflow hole, the inflow hole being formed to move the fluid to the mount portion.

Here, the passage hole may include a shape connecting the inlet hole and the seating portion in a straight line.

The filter may be installed to cover the entire inlet hole.

As described above, the injector according to the present embodiment has an effect that the fuel flows smoothly.

In addition, according to the present embodiment, since the valve seat of the injector has a structure that can reduce the manufacturing cost of the filter provided on the upper surface of the injector, the manufacturing cost of the injector is reduced.

In addition, the effects of the present invention have various effects such as excellent durability according to the embodiments, and such effects can be clearly confirmed in the description of the embodiments described later.

Figure 1 shows the lower end of an injector according to an embodiment of the invention.
Fig. 2 shows the appearance of the filter.
3 shows a valve seat according to an embodiment of the present invention.

Hereinafter, an embodiment of the present invention will be described in detail with reference to exemplary drawings. However, this is not intended to limit the scope of the invention.

It should be noted that, in adding reference numerals to the constituent elements of the drawings, the same constituent elements are denoted by the same reference numerals even though they are shown in different drawings. In the following description of the present invention, a detailed description of known functions and configurations incorporated herein will be omitted when it may make the subject matter of the present invention rather unclear.

In addition, the size and shape of the components shown in the drawings may be exaggerated for clarity and convenience of explanation. In addition, terms specifically defined in consideration of the constitution and operation of the present invention are only for explaining the embodiments of the present invention, and do not limit the scope of the present invention.

Figure 1 shows the lower end of an injector according to an embodiment of the invention. Fig. 1 (a) shows a state in which the ball valve is located at the oil passage closing position, and Fig. 1 (b) shows a state where the ball valve is located in the oil passage opening position. Fig. 2 shows the appearance of the filter.

An injector (1) for an internal combustion engine according to an embodiment of the present invention includes a housing (10); A solenoid disposed inside the housing to form a magnetic field in accordance with a control signal of the vehicle controller and to suck up the armature through the magnetic field to move it up and down; A needle (20) having a ball valve (30) at an end thereof, connected to the armature and moving up and down with the armature; A ball valve (30) installed at an end of the needle (20) and vertically moving together with the needle (20) to open and close the flow path; The ball valve 30 has a top surface 42 and a seating part 46 in which the ball valve 30 is seated in the downward direction. The ball valve 30 has a through hole (not shown) through which the top surface 42 and the seating part 41) are formed; And a filter 50 installed on the top surface 42 of the valve seat 40 to filter out foreign matter passing through the flow passage hole 41.

The controller may comprise an electronic control unit (ECU) of the vehicle.

The solenoid may include a coil and a bobbin around which the coil is wound. The amateur can interact with the solenoid and be drawn into the solenoid. When power is applied to the injector 1, the solenoid can generate a magnetic field to move the armature up and down. According to the embodiment, when the power source is applied, the armature can move upward to open the valve, and when the power source is cut off, the armature can be moved downward due to the elastic force of the return spring to close the valve.

The needle 20 may be movably installed inside the housing 10. The needle 20 can reciprocate within the housing 10 along the same direction as the longitudinal axis L of the injector 1. [ The needle 20 may have a shape elongated in the same direction as the reciprocating movement direction and may have a structure in which an armature is surrounded at the upper end. A ball valve 30 may be installed at the lower end of the needle 20.

When the power source is applied, the needle 20 can move upward together with the armature. In this case, the ball valve 30 provided at the end of the needle 20 can also move upward to open the valve. In addition, when the power source is shut off, the needle 20 can move downward together with the armature, and the ball valve 30 can also move downward to close the valve.

A valve seat 40 may be provided at the lower end of the injector 1. That is, the valve seat 40 may be installed at the lower end of the housing 10 by press-fitting or screwing. In this case, the circumferential surface 40a of the valve seat 40 can be brought into close contact with the inner surface of the lower end portion of the housing 10.

Since the operation structure of the injector itself is well known in the art, a detailed description thereof will be omitted.

3 shows a valve seat according to an embodiment of the present invention.

The valve seat 40 may be formed in a cylindrical shape. The valve seat 40 may be formed with a seating portion 46 on which the ball valve 30 is seated. The central portion of the upper end surface 42 of the valve seat 40 may be formed into a depressed shape, which may be the seating portion 46.

A passage hole 41 may be formed in a portion of the valve seat 40 other than the seating portion 46. The flow hole 41 may be a passage through which the fluid that flows into the injector 1 and flows through the injector 1 and flows to the lower end of the injector 1 is injected to the outside.

The flow path hole 41 may be formed in a straight line shape so that the fluid flowing into the flow path hole 41 can move linearly until it flows out from the flow path hole 41.

According to the embodiment, a plurality of flow holes 41 may be provided. According to the embodiment, six flow holes 41 may be formed. By forming a plurality of flow holes 41, the fluid can move more smoothly.

The flow passage hole 41 may be formed so as to approach the longitudinal axis L of the injector 1 from the upper end to the lower end of the valve seat 40. The one end 41a of the flow hole 41 may be formed at a predetermined distance in the radial direction with respect to the longitudinal axis L of the injector 1 and the lower end of the flow hole 41 may be formed in the flow hole 41 may be formed closer to the radial direction than the one end 41a.

One end 41a of the flow hole 41 may be connected to the upper end surface 42 of the valve seat 40 and the other end 41b may be connected to the seat portion 46. [ This structure serves to assemble the fluid, which has moved to the lower end of the injector 1, toward the longitudinal axis L of the injector 1. The one end 41a of the flow hole 41 and the other end 41b may be connected by a straight line.

The filter 50 is installed on the upper end surface 42 of the valve seat 40 so as to block the foreign matter inside the injector 1 from being injected together with the injected fluid from the injector 1 and to be introduced into the combustion chamber, . The filter 50 may be in the form of a disk having an outer diameter and an inner diameter and a portion of the filter 50 adjacent to the inner diameter may contact the upper end surface 42 of the valve seat 40. The upper end surface 42 of the valve seat 40 may be in the form of a surface having an outer diameter and an inner diameter similarly to the filter 50 and one end 41a of the flow passage hole 41 may be formed on the upper end surface 42 between the inner and outer diameters. The inner diameter of the upper end surface 42 of the valve seat 40 and the flow hole 41 may be formed separately. That is, the remaining surface of the upper surface 42 of the valve seat 40 excluding the one end 41a of the flow hole 41 can contact the filter 50. The filter 50 may be installed so as to cover one end 41a of the flow passage hole 41.

The seating portion 46 formed from the top surface 42 of the valve seat 40 is connected to the seating surface 44 on which the ball valve 30 is seated and one end of the seating surface 44 is connected to the top surface 42 of the valve seat 40 And a circumferential surface 43 whose other end is connected to the seating surface 44. Here, the other end 41b of the flow hole 41 may be connected to the circumferential surface 43 of the seating portion 46. [

The seating surface 44 may include a first conical surface 44a formed at the center and a second surface 44b connected to the first surface 44a at an angle. A valve hole 45 may be formed in the first inner surface 44a. The number of the valve holes 45 formed in the first inner surface 44a may be plural. The upper end of the valve hole 45 may be formed on the first inner surface 44a and the lower end of the valve hole 45 may be formed on the lower end surface of the valve seat 40. That is, the valve hole 45 may be formed through the valve seat 40. The fluid located inside the injector 1 can be discharged to the outside of the injector 1 through the valve hole 45. [ The valve hole 45 may be formed to be away from the longitudinal axis L of the injector 1 from the upper end to the lower end of the valve seat 40.

And the ball valve 30 may contact the second inner surface 44b. According to the embodiment, the ball valve 30 can make a line contact with the second inner surface 44b. When the ball valve 30 comes into contact with the second inner surface 44b, the flow path is shut off and the fluid is not sprayed. However, when the ball valve 30 moves away from the second inner surface 44b, the flow path is opened and the fluid is injected.

The inner diameter formed by the circumferential surface 43 of the seat portion 46 is set to be sufficiently large that the ball valve 30 does not move left and right inside the seat portion 46 when the ball valve 30 is inserted into the seat portion 46 Is smaller than the diameter of the ball valve (30). I.e., less than the diameter of the ball valve 30 so as not to move in the radial direction. Therefore, the clearance is very small. The ball valve 30 is repeatedly inserted into and drawn out from the seating portion 46. This structure can improve the durability of the valve seat 40 and the ball valve 30. [

The embodiment of the valve seat 40 according to the present invention can be installed in the injector 1 for the internal combustion engine.

One embodiment of the valve seat 40 according to the present invention is a valve seat 40 provided at the lower end of the housing 10 of the injector 1 installed in the internal combustion engine and cooperating with the ball valve 30 to open / ), Comprising: a top surface (42) on which the filter (50) is installed; A circumferential surface 40a press-fitted into the housing 10; A seating part 46 formed in a shape such that a center part of the top surface 42 is recessed, in which the ball valve 30 is seated and at least one valve hole 45 is formed in the bottom surface; A plurality of inflow holes 41a formed between a first rim connected to the seating portion 46 of the top surface 42 and a second rim connected to the circumferential surface 40a; And a flow hole 41 connected to the inlet hole 41a and configured to move the fluid to the seating portion 46. [

Here, the flow hole 41 may include a shape connecting the inlet hole 41a and the seating portion 46 in a straight line.

Here, the filter 50 may be installed so as to cover the entire inlet hole 41a.

On the other hand, the embodiment of the internal combustion engine according to the present invention is an internal combustion engine capable of including the injector 1 of the above-described embodiment. Any internal combustion engine to which the injector 1 of the above-described embodiment can be applied is acceptable. For example, the internal combustion engine is a vehicle internal combustion engine installed in a vehicle and having a function of driving the vehicle. Such an automotive internal combustion engine itself is well known in the art and its detailed description is omitted.

The foregoing description is merely illustrative of the technical idea of the present invention, and various changes and modifications may be made by those skilled in the art without departing from the essential characteristics of the present invention.

Therefore, the embodiments disclosed in the present invention are intended to illustrate rather than limit the scope of the present invention, and the scope of the technical idea of the present invention is not limited by these embodiments. The scope of protection of the present invention should be construed according to the following claims, and all technical ideas within the scope of equivalents should be construed as falling within the scope of the present invention.

1: Injector for internal combustion engine 10: Housing
20: Needle 30: Ball valve
40: valve seat 50: filter

Claims (17)

housing;
A solenoid disposed inside the housing to form a magnetic field in accordance with a control signal of the controller and move the armature up and down through the magnetic field;
A needle having a ball valve at an end thereof and connected to the armature, the needle moving up and down with the armature;
A ball valve installed at an end of the needle to move up and down together with the needle to open and close the flow path;
A valve seat having a top surface, a seat portion on which the ball valve is seated downward during movement, a valve seat penetrating the inside thereof and having a flow hole for connecting the top surface and the seating portion; And
A filter installed on the upper surface of the valve seat to filter out foreign matter passing through the flow hole;
And an injector for an internal combustion engine. The method according to claim 1,
Wherein the passage hole includes a straight line shape so that the fluid can move linearly. The method according to claim 1,
And the number of the flow holes is six. The method according to claim 1,
Wherein the flow hole is formed so as to be closer to a longitudinal axis of the injector from an upper end to a lower end. The method according to claim 1,
Wherein one end of the passage hole is connected to the upper end surface and the other end is connected to the seat portion. 6. The method of claim 5,
And the one end of the flow passage hole and the other end of the flow passage hole are connected by a straight line. 6. The method of claim 5,
Wherein the filter is installed so as to cover the one end of the flow path hole. 6. The method of claim 5,
Wherein the seating portion includes a seating surface on which the ball valve is seated, a circumferential surface having one end connected to the upper surface of the valve seat and the other end connected to the seating surface, and the other end connected to the circumferential surface And an injector for an internal combustion engine. 9. The method of claim 8,
Wherein the seating surface includes a conical first seating surface formed at a central portion thereof and a second seating surface connected to the first seating surface at a predetermined angle. 10. The method of claim 9,
Wherein a valve hole is formed in the first seating surface, and the ball valve is in contact with the second seating surface. 11. The method of claim 10,
Wherein the valve hole is formed to be away from the longitudinal axis of the injector as it goes from the upper end to the lower end. 9. The method of claim 8,
Wherein the inner diameter formed by the circumferential surface is smaller than the diameter of the ball valve so that the ball valve does not move laterally when the ball valve is inserted. The method according to claim 1,
Wherein the filter is in the form of a disk having an inner diameter, and a portion of the filter adjacent to the inner diameter is in contact with the top surface of the valve seat. An internal combustion engine comprising an injector according to any one of claims 1 to 13. 1. A valve seat provided at a lower end of a housing of an injector installed in an internal combustion engine, the valve seat interacting with a ball valve to open and close a flow passage,
A top surface on which the filter is installed;
A circumferential surface press-fitted into the housing;
A seating part formed in a shape such that a central part of the top surface is recessed, in which the ball valve is seated and at least one valve hole is formed in the bottom surface;
A plurality of inflow holes formed between a first rim connected to the seating portion of the top surface and a second rim connected to the circumferential surface; And
A flow hole connected to the inflow hole, the inflow hole being formed to move the fluid to the seating portion;
And a valve seat for the injector. 16. The method of claim 15,
Wherein the passage hole includes a shape that connects the inlet hole and the seating portion in a straight line. 16. The method of claim 15,
Wherein the filter is installed to cover the entire inlet hole.

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