KR20110028879A - Exhaust gas recirculation valve for vehicles - Google Patents

Abstract

PURPOSE: An exhaust gas recirculation valve for a vehicle is provided to prevent the accumulation of carbon component of the exhaust gas on the contact area of a sealing and a valve plate by making the contact area at a tilt. CONSTITUTION: An exhaust gas recirculation valve for a vehicle comprises a valve body(7), a seat ring(9), a turning gear(10) and a shaft(20). The valve body comprises an inhalation hole(7a) on the bottom part in order to guide exhaust gas to the combustion chamber. The seat ring is arranged in the inhalation hole. The turning gear is arranged in the valve body. The turning gear is meshed with a driving gear(5a) of a motor(5) and axis-rotated. The shaft is screwed with the turning gear and moves up and down according to the forward and reversing rotation of the turning gear. Shaft comprises a valve plate(22) for opening and closing the inhalation hole. The contiguous area of the seat ring and the valve plate is line contact.

Description

Easy gas recirculation valve for vehicles}

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an easy-to-use valve for automobiles, and more particularly, by providing inclined surfaces such that the contact between the valve plate for opening and closing the inlet port of the valve body and the seat ring which is in close contact therewith makes an inline contact, The present invention relates to an easy-to-vehicle valve for automobiles that prevents carbon components from being deposited on contact portions of each other and thus prevents leakage of exhaust gas.

In general, exhaust gas recirculation (EGR) for an internal combustion engine refers to a device that can effectively control nitrogen oxide (NO _X ) among various exhaust gas reduction technologies aimed at environment-friendly engines.

The research on automobile engines has developed along with social phenomena, and recently, three axes of fuel economy, environment, and safety have been developed evenly. In addition, regulations on automobile exhaust gas are being implemented in earnest.

On the other hand, EEG (EGR) device is one of the most effective methods for reducing nitrogen oxides, which is because the inert gas, such as carbon dioxide in the exhaust gas is replaced with a part of the intake air, the heat capacity of the mixer is increased to the inside of the cylinder It is a principle to reduce the amount of nitrogen oxide generated by suppressing the rise of the temperature of the combustion gas, and also suppresses the generation of thermal nitrogen oxide by lowering the excess air ratio.

In addition, since part of the intake air is replaced with exhaust gas having a low oxygen concentration, the oxygen in the combustion chamber is reduced, so that nitrogen oxides are suppressed. As a result, the EZR device significantly reduces the load of the nitrogen oxide reduction reaction in the catalytic device. Done.

In addition, the nitrogen oxide reduction effect of the diesel engine is easy is different from the gasoline engine. In gasoline engines, EG gas is uniformly mixed with the fuel mixer to efficiently cool the combustion flame, while in diesel engines, EG gas is spatially limited in cooling the combustion flame because the fuel mixer is very heterogeneous in space. There is this.

Therefore, the theory of nitrogen oxide reduction by EZR in diesel engines has been strongly suggested that nitrogen oxides are reduced by reducing oxygen concentration in combustion air, rather than the explanation that IZAL gas lowers combustion temperature like gasoline engines. Research on identification continues.

On the other hand, as an example, a schematic view of an IG valve applied to an exhaust gas recirculation apparatus for an internal combustion engine according to the prior art includes: a valve main body having an inlet for allowing exhaust gas to flow into a combustion chamber at a lower end thereof; A seating ring, a rotating gear disposed inside the valve body and meshed with the drive gear of the motor, and screwed with the rotating gear to be elevated up and down according to the forward and reverse rotation of the rotating gear, and closely connected to the seating ring at the lower end. And it is configured to include a shaft provided with a valve plate for opening and closing the inlet port of the valve body while being spaced apart.

In the related art easy-valve valve according to this configuration, when the drive gear of the motor rotates to rotate the rotary gear in the valve body to open the valve plate, the shaft which is screwed with the rotary gear is lowered in conjunction with the inlet port. It is structured to open.

However, since the contact of the valve valve for opening and closing the inlet port of the valve body and the seat ring which is in close contact with the valve plate of the related art in the prior art, the carbon component in the inflowing exhaust gas is applied to these contact surfaces. As a result of the deposition, there was a problem such as causing leakage of the exhaust gas.

The present invention has been made to solve such a problem, by providing an inclined surface to each line contact between the valve plate for opening and closing the inlet port of the valve body and the seat ring in close contact with the carbon component, the carbon component in the exhaust gas flowing in It provides an easy-to-use valve for automobiles that prevents the exhaust gas from leaking out in contact with each other and thus prevents the leakage of the exhaust gas in advance, thereby facilitating the intake of the exhaust gas and improving the reliability of the product. Its purpose is to.

In order to achieve the above object, the easy-to-use vehicle valve of the present invention includes a valve body provided with an inlet for allowing exhaust gas to flow into a combustion chamber at a lower end thereof; A seat ring disposed at an inlet of the valve body; A rotary gear disposed in the valve body and meshed with a drive gear of the motor to rotate the shaft; And a shaft provided with a valve plate coupled to the rotary gear to move up and down according to the forward and reverse rotation of the rotary gear, and a valve plate for opening and closing the intake port of the valve body while being closely and spaced apart from the seat ring at the lower end. In the valve, the contact portion between the seat ring and the valve plate is characterized in that the line contact with each other.

In addition, in the ESR valve for automobiles according to the present invention, it is preferable that an inclined surface inclined obliquely to be in line contact with the upper edge of the valve plate at the lower edge of the seat ring.

In addition, in the ESR valve for automobiles according to the present invention, it is preferable that an inclined surface inclined obliquely to be in line contact with the lower edge of the seat ring at the upper edge of the valve plate.

In addition, in the ESR valve for automobiles according to the present invention, it is preferable that the inclined surfaces that are inclined at an angle with different inclination angles are formed so that the lower edge of the seat ring and the upper edge of the valve plate are in line contact with each other.

As described above, the ESR valve for a vehicle according to an embodiment of the present invention is provided by inclined surfaces such that the contact between the valve plate for opening and closing the inlet port of the valve body and the seat ring which is in close contact therewith makes a line contact. It is possible to prevent the carbon components in the exhaust gas from being deposited on the contact portion of each other, thereby preventing the leakage of the exhaust gas in advance, thereby facilitating the intake of the exhaust gas and improving the reliability of the product. Get the effect.

Hereinafter, the present invention having the above configuration will be described in detail with reference to the accompanying drawings.

As shown in FIGS. 1 to 4, an ESR valve for a vehicle according to an exemplary embodiment of the present invention is disposed in the valve body 7 and is engaged with the drive gear 5a of the motor 5 to rotate in rotation. 10, a shaft 20 which is screwed up and lifted with the rotary gear 10, a spring 30 for elastically supporting the rotary gear 10 to return to its original state, and an outside of the spring 30. The spring cover 40 and the rotation stop member 50 for stopping the rotation of the shaft 20 is covered with a configuration.

The valve body 7 has a structure in which an intake port 7a is provided at a lower end portion to allow exhaust gas to flow into a combustion chamber (not shown).

On the inner circumferential surface of the inlet port 7a of the valve body 7, a ring-shaped seat ring 9 having a sealing function for sealing the inlet port 7a close to the valve plate 22 of the shaft 20 is provided. It is prepared.

In addition, the seat ring 9 preferably has a rubber material in order to have a sealing function.

The rotary gear 10 is disposed inside the valve body 7 and a screw thread 12a is formed on the inner circumferential surface of the central through hole 12 so as to be screwed with the screw thread 20a of the shaft 20. The disk ring structure is formed in which the gear teeth 14 are engaged with the drive gear 5a of the < RTI ID = 0.0 >

The shaft 20 has a long rod shape in which a screw thread 20a is formed at the center of the outer circumferential surface thereof so as to be screwed through the through hole 12 of the rotary gear 10, and an inlet 7a of the valve body 7 is formed at the lower end thereof. The disk-shaped valve board 22 for opening / closing () is provided.

Here, the lifting structure according to the screw coupling of the rotary gear 10 and the shaft 20 has a structure in which the shaft 20 is elevated according to the forward and reverse rotation of the rotary gear 10 by applying a general ball screw structure. have.

The lower edge of the rim of the seat ring 9 and the upper edge of the rim of the valve plate 22 may have different inclination angles such that the contact portions are in line contact with each other between the seat ring 9 and the valve plate 22. Photograph inclined surfaces 9a and 22a are formed, respectively.

As such, it is most preferable to form the inclined surfaces 9a and 22a at the contact portions of the seat ring 9 and the valve plate 22 so that the line contact between the seat ring 9 and the valve plate 22 is made accurately.

On the other hand, within the range that satisfies the condition that the line ring between the seat ring 9 and the valve plate 22 is made to be in contact with each other so as to be in line contact with the upper edge of the edge of the valve plate 22 only the lower edge of the edge of the seat ring (9). The inclined surface 9a which is inclined may be formed, or, conversely, the inclined surface 22a which is inclined obliquely so as to be in line contact with the lower edge of the seat ring 9 only at the upper edge of the valve plate 22. You could do it.

The spring 30 is coupled to the rotary gear 10 to elastically support the rotary gear 10 to be returned to its original state, that is, the shaft 20 is lowered so that the inlet 7a of the valve body 7 is lowered. Is in the open state, and the rotary gear 10 is returned to its original state so that the shaft 20 is returned to its original state by the repulsive force of the spring 30 when the power of the motor 5 is cut off. It has a function to make.

As the spring 30 for imparting the original return function, it may be desirable to apply a spring having a function to smoothly return the object in the rotated state to the original state.

The spring cover 40 has a cover shape covering the upper outer side of the spring 30, and an extension pipe body 42 having a circular tube structure through which the shaft 20 penetrates upward is provided at the center thereof.

On the other hand, it will be apparent that a separate controller (not shown) is provided to automatically control the valve plate 22 to be opened and closed by the forward, reverse rotation, and power cutoff of the motor 5.

In the vehicular easy-to-use valve according to the present invention, the drive gear 5a of the motor 5 rotates to open the inlet port 7a of the valve body 7, thereby rotating the gear 10 in the valve body 7. When the shaft is rotated, the shaft 20, which is screwed by penetrating the through hole 12 of the rotary gear 10 up and down, is lowered, and finally the inlet port 7a of the valve body 7 is opened. It is to be made.

At this time, when the shaft 20 reaches a corresponding point during the lowering, the lowering of the shaft 20 is stopped by a separate stopper (not shown), and at the same time, the rotational speed of the rotary gear 10 and the driving gear 5a is also reduced. Will stop.

The rotary gear 10 is elastically supported by the spring 30 by the rotated rotation angle.

In such a state, the exhaust gas is smoothly sucked through the open inlet port 7a to circulate toward the combustion chamber.

On the other hand, if the power supply to the motor 5 is cut off while the intake is performed, the drive gear 5a of the motor 5 is in an idle state, and thus the rotary gear 10 meshed with the drive gear 5a is also present. The rotary gear 10 is returned to its original state by the repulsive force of the spring 30, and the shaft 20 is also raised in conjunction with the valve plate 22 in the seat ring 9 of the intake port 7a. ) Is sealed in line contact, and exhaust gas intake is completely blocked.

In this way, the motor 5 may be rotated forward and backward through the controller, or the power may be cut off to selectively open and close the line contact between the valve plate 22 and the seat ring 9.

 As described above, the present invention has been described with reference to the above preferred embodiments, but the embodiments to which such embodiments are simply combined with conventionally known techniques, as well as the technical field of the present invention in the claims and detailed description of the present invention. Those skilled in the art will readily be able to see that the variations can be used within the scope of the present invention.

1 is a perspective view showing an easy-to-use valve for a vehicle according to an embodiment of the present invention.

Figure 2 is an exploded perspective view showing an ESR valve for a vehicle according to an embodiment of the present invention.

3 is a cross-sectional view showing a state in which the valve plate of the ESR valve for automobiles according to the embodiment of the present invention is closed.

Figure 4 is a cross-sectional view showing a state in which the valve plate of the easy-to-vehicle valve for a vehicle according to an embodiment of the present invention.

** Description of symbols for the main parts of the drawing **

5: Motor 5a: Drive Gear

7: valve body 7a: inlet port

9: Seating 9a: Slope

10: rotary gear 12: through hole

12a: Thread 14: Gear tooth

20: shaft 20a: thread

22: valve plate 22a: inclined surface

30: spring 40: spring cover

42: extension tube

Claims (4)

A valve body 7 provided with an inlet 7a for allowing exhaust gas to flow into the combustion chamber at a lower end thereof; A seat ring (9) disposed at the inlet (7a) of the valve body (7); A rotary gear (10) disposed inside the valve body (7) and engaged with the drive gear (5a) of the motor (5) and axially rotated; And The screw is coupled to the rotary gear 10 to move up and down according to the forward and reverse rotation of the rotary gear 10, and close and space the seat ring 9 at the lower end to open and close the intake port 7a of the valve body 7. The shaft 20 is provided with a valve plate 22 to make; In the automotive easy valve comprising a, Contact valve between the seat ring (9) and the valve plate (22) is a linear easy valve for automobiles, characterized in that the contact. The method of claim 1, ESR valve for the automobile, characterized in that the inclined inclined surface (9a) is inclined so as to be in line contact with the upper edge of the valve plate 22 in the lower edge of the seat ring (9). The method of claim 1, ESR valve for an automobile, characterized in that the inclined surface (22a) is inclined obliquely to be in line contact with the lower edge of the seat ring (9) in the upper edge of the valve plate (22). The method of claim 1, ESR valves for automobiles, characterized in that the inclined surfaces (9a, 22a) are inclined at different angles with different inclination angles such that the lower edge of the seat ring and the upper edge of the valve plate (22) are in line contact with each other.

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