KR20110028880A - Exhaust gas recirculation valve for vehicles - Google Patents

Abstract

PURPOSE: An exhaust gas recirculation valve for a vehicle is provided to prevent damage due to excessive rotation of a shaft and a rotary gear in advances by mounting a rotation stopping member. CONSTITUTION: An exhaust gas recirculation valve for a vehicle comprises a valve body(7), a turning gear(10), a shaft(20), a spring(30), a spring cover(40) and a rotation stop member(50). The valve body comprises an inhalation hole(7a) on the bottom part to guide exhaust gas to the combustion chamber. The turning gear is arranged in the valve body. The turning gear is meshed with a driving gear(5a) of a motor(5). The shaft is meshed with the turning gear using a screw and moves up and down according to the forward and reversing rotation of the turning gear. The shaft comprises a valve plate(22) opening and closing an inhalation hole(7a). The spring is combined with the turning gear. The spring elastically supports the turning gear in order to return to the original state. The spring cover covers the outside of the spring. The spring cover comprises an extension tube body(42) on the center part to upward penetrate the shaft. The rotation stop member stops the rotation when the shaft for opening the inhalation hole downward moves as fixed distance.

Description

Easy gas recirculation valve for vehicles}

The present invention relates to an easy-to-use valve for automobiles, and more particularly, is coupled to the upper end of the shaft, and once the shaft is lowered to the corresponding position, it is caught by the extension tube of the spring cover to stop the lowering of the shaft and at the same time the rotation of the rotary gear is stopped. By providing the rotation stop member to stop, it is possible to prevent both damage due to the excessive rotation operation between the shaft and the rotary gear, as well as to precisely control the opening amount of the valve plate to facilitate the intake of exhaust gas. It relates to an easy-to-use automotive valve.

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. Among these, as the world's interest in the environment increases, ways to improve air pollution have begun to be discussed. 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 the nitrogen oxides, which is the inert gas such as carbon dioxide of the exhaust gas is replaced with a part of the intake air, the heat capacity of the mixer is increased to increase the combustion in the cylinder It is a principle to reduce the amount of nitrogen oxide generated by suppressing the temperature rise of the gas, and also suppresses the generation of thermal nitrogen by reducing 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 the easy valve applied to the exhaust gas recirculation device for the internal combustion engine of the prior art, a screw is formed on the inner circumferential surface of the central through-hole and the rotation gear is meshed with the drive gear of the motor, and this A shaft is formed on the outer circumferential surface to be screwed through the through hole of the rotary gear, and a valve plate having a valve plate for opening and closing the inlet port of the valve body at the lower end thereof, and a spring that is elastically supported to be coupled to the rotary gear to return to the original state. And a spring cover provided with an extension tube covering the outside of the spring and surrounding the shaft in a state in which the shaft penetrates upward.

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, the above-described conventional easy-to-use valves for automobiles do not have a separate stopper for limiting the lifting range of the shaft which is relatively elevated according to the rotation of the shaft of the rotary gear. Since the lifting and lowering stops, it is inevitable that damage (for example, friction between the thread of the rotary gear and the outer circumferential surface of the shaft) occurs at the position where the screw engagement is disengaged. There was a problem that the degree of opening of the plate could not be accurately controlled and the intake amount of the exhaust gas through the inlet was not constant.

The present invention has been made to solve such a problem, coupled to the upper end of the shaft and the shaft is lowered to the corresponding position is caught by the extension of the spring cover to stop the lowering of the shaft and at the same time to stop the rotation of the rotary gear By providing a rotation stop member to prevent the damage caused by the excessive rotation operation between the shaft and the rotary gear in advance, it is possible to extend the life of the parts, and to precisely control the opening amount of the valve plate It is an object of the present invention to provide an easy-to-use valve for automobiles that can improve the reliability of the product by making the suction of the exhaust gas smooth.

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 rotary gear disposed in the valve body and meshed with a drive gear of the motor to rotate the shaft; A shaft having a valve plate coupled to the rotary gear to move up and down according to the forward and reverse rotations of the rotary gear and to open and close the inlet port of the valve body at a lower end thereof; A spring coupled to the rotary gear to elastically support the rotary gear to be returned to its original state; And a spring cover provided with an extension tube covering the outside of the spring and surrounding the shaft in a state in which the shaft penetrates upward in the center thereof, wherein the shaft has a predetermined length for opening the intake port. It is characterized in that the rotation stop member is further provided to stop the rotation when lowered.

In addition, in the ESR valve for automobiles according to the present invention, the rotation stop member is coupled to the upper end of the shaft and the fixed length of the shaft after the fixed length is lowered to stop the lowering of the shaft hanging on the upper end of the extension tube of the spring cover. It is preferable to have a structure.

In addition, in the ESR valve for automobiles according to the present invention, the structure of the rotation stop member is composed of a coupling pipe body is coupled to cover the upper outer peripheral surface of the shaft, and a structure provided with a locking projection protruding radially from the upper end of the coupling pipe body. It is preferable.

In addition, in the ESR valve for automobiles according to the present invention, it is preferable that the locking protrusion of the rotation stop member has a flange shape extending radially from the entire upper circumferential surface of the coupling pipe body.

In addition, in the ESR valve for an automobile according to the present invention, a guide groove is formed on an inner circumferential surface of the extension pipe to prevent the rotation stop member from being axially rotated, and the outer circumferential surface of the coupled pipe body corresponds to the above. It is preferable that the wing 52a protrudes along the guide groove.

As described above, the ESR valve for a vehicle according to an embodiment of the present invention is coupled to the upper end of the shaft and the shaft is lowered to the corresponding position after the shaft is caught by the extension tube of the spring cover to stop the lowering of the shaft at the same time the rotary gear By providing a rotation stop member to stop the rotation of the shaft, it is possible to prevent the damage of both due to the over-rotation operation between the shaft and the rotary gear to extend the life of the parts, and also to open the valve plate It is possible to improve the reliability of the product by smoothly controlling the amount so that the intake of exhaust gas can be performed smoothly.

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).

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 is a structure that allows the shaft 20 to be elevated according to the forward and reverse rotation of the rotary gear 10 by applying a general ball screw structure. It is.

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.

The rotation stop member 50 is to lower the stop when the shaft 20 is lowered by a predetermined length for opening the inlet (7a), that is, the rotation stop member 50 is the upper end of the shaft 20 After the predetermined length of the shaft 20 in the coupled state is lowered to stop the falling of the shaft 20 is caught in the upper end of the extension pipe 42 of the spring cover 40.

Here, the structure of the rotation stop member 50 is coupled to the coupling pipe body 52 is covered by covering the upper outer peripheral surface of the shaft 20, and the engaging protrusion 54 formed to project radially from the upper end of the coupling pipe body 52 As a structure provided, the locking portion 54 has a flange shape extending radially from the entire upper circumferential surface of the coupling pipe body 52.

In addition, a guide groove 42a is formed on the inner circumferential surface of the extension pipe body 42 in the vertical direction so as to prevent the shaft from being rotated while the rotation stop member 50 is lifted, and the coupling pipe body 52 corresponding thereto. The wing portion 52a is formed to protrude along the guide groove 42a on the outer circumferential surface of the blade.

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 engaging protrusion 54 of the rotation stop member 50 coupled to the upper end of the shaft 20 is the upper end of the extension pipe 42 of the spring cover 40. The lowering of the shaft 20 is stopped and at the same time, the rotation of the rotary gear 10 and the drive gear 5a is also stopped.

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. In this case, the rotary gear 10 is returned to its original state by the repulsive force of the spring 30, and the shaft 20 is also interlocked. As a result, the valve plate 22 is sealed to the intake port 7a, thereby blocking the intake air. .

In this way, the valve plate 22 may be selectively opened and closed by operating the motor 5 forward, reverse rotation, or cutting off the power through the controller.

 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. It will be appreciated that those skilled in the art can readily be modified and used within the technical 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

10: rotary gear 12: through hole

12a: Thread 14: Gear tooth

20: shaft 20a: thread

22: valve plate 30: spring

40: spring cover 42: extension pipe

42a: guide groove 50: rotation stop member

52: coupling body 52a: wing portion

54: obstacles

Claims (5)

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 rotary gear 10 disposed inside the valve body and engaged with the drive gear 5a of the motor 5 to be axially rotated; A shaft (20) provided with a valve plate (22) which is screwed with the rotary gear (10) to move up and down according to the forward and reverse rotation of the rotary gear, and to open and close the inlet (7a) of the valve body (7) at the lower end; A spring 30 coupled to the rotary gear 10 to elastically support the rotary gear 10 to be returned to its original state; And A spring cover 40 covering the outside of the spring 30 and having an extension tube 42 in the center thereof to allow the shaft 20 to penetrate upwardly; In the automotive easy valve comprising a, ESR valve for a vehicle, characterized in that the rotation stop member 50 is further provided to stop the rotation when the shaft 20 is lowered by a predetermined length for opening the inlet (7a). The method of claim 1, The rotation stop member 50 is caught in the upper end of the extension pipe 42 of the spring cover 40 after the predetermined length of the shaft 20 in the state coupled to the upper end of the shaft 20 of the shaft 20 Easy RV valve for cars characterized in that the structure is to stop the descent. The method of claim 2, The rotation stop member 50 has a structure in which a coupling pipe body 52 coupled to cover an upper circumferential surface of the shaft 20 and a locking protrusion 54 radially protruding from an upper end of the coupling pipe body 52 are provided. Easy RV valve for cars characterized in that. The method of claim 3, Engagement protrusion 54 of the rotation stop member 50 is an automobile easy R valve, characterized in that the flange shape extending radially from the entire upper peripheral surface of the coupling pipe (52). The method of claim 3, Guide grooves 42a are formed on the inner circumferential surface of the extension pipe body 42 to prevent shaft rotation while the rotation stop member 50 is lifted, and the guide grooves on the outer circumferential surface of the coupling pipe body 52 corresponding thereto. An easy-to-vehicle valve for a vehicle, characterized in that the wing portion (52a) to be elevated along the 42a protruding.

Images