KR20160103431A - Exhaust Gas Recirculation Valve - Google Patents

Abstract

The present invention relates to an exhaust gas recirculation valve comprising a housing, a rotational force transfer part, an eccentric elevation part and a value driving part. The housing has an inlet allowing the introduction of exhaust gas and an outlet discharging exhaust gas and has a driving motor installed thereon to generate rotational force. The rotational force transfer part allows a plurality of gears to be engaged by the driving motor to rotate a rotary shaft. The eccentric elevation part allows the rotary shaft to be coupled to one side of an eccentric cam and allows a link to be rotationally coupled to a position spaced from the rotary shaft at a predetermined distance. The rotational shaft and the link are installed on the eccentric cam to be adjacent such that a pressure angle is reduced when the eccentric cam is rotated. A woodruff key of the rotary shaft is eccentrically positioned on one side of the eccentric cam such that a pressure angle according to the rotation of the eccentric cam can be reduced. As a second hinge is moved along an elongated hole of the link, load according to the elevation of a valve driving part can be reduced. In addition, stress applied to a first hinge and second hinge can be reduced.

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an exhaust gas recirculation valve,

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an exhaust gas recirculation valve, and more particularly, to an exhaust gas recirculation valve capable of opening and closing a valve seat in contact with a discharge passage of a housing by transmitting a rotational force of a motor.

Generally, the exhaust gas of an automobile is a gas which is compressed in a cylinder at a high temperature and a high pressure in a cylinder, and then expanded into the atmosphere through an exhaust manifold.

Most of these exhaust gases are water vapor and carbon dioxide, and other harmful substances such as carbon monoxide (CO), hydrocarbons (HC), and nitrogen oxides (NOx).

An exhaust gas recirculation valve (EGR) is a means for reducing nitrogen oxides in the exhaust gas. A part of the exhaust gas is sent back to the intake manifold to reduce the combustion temperature when the gas mixture is burned, Is reduced.

That is, the nitrogen oxide (NOx) can reduce the amount of combustion by lowering the combustion temperature, and the combustion temperature is most influenced by the combustion speed. Therefore, the density is lowered without changing the air-fuel ratio of the cylinder mixer itself.

Therefore, when the burning rate is lowered and the increase of the combustion temperature is suppressed, the nitrogen oxide can be reduced as a result.

An exhaust gas recirculation valve (EGR valve) is provided between the exhaust manifold and the intake manifold to open and close the passage by controlling the EGR valve only in the rotation other than idling and warming up.

The EGR valve is opened according to the amount of opening of the throttle valve in the rotation other than idling and warm-up, and the exhaust gas is partially recirculated to the intake manifold of the engine so as to minimize the reduction of the engine output, It lowers the temperature and reduces the emission of nitrogen oxides (NOx).

In recent years, exhaust gas recirculation valves require more precise control as the regulation of exhaust gas is strengthened. The motor of the exhaust gas recirculation valve is a direct drive type in which the rotation motion of the armature causes the screw And converts it into linear motion of valve shaft.

Since the direct-current motor of the exhaust gas recirculation valve of the direct drive system has a stroke of 6 mm, the lead of the screw inside the armature is also 6 mm.

Therefore, it is very difficult to precisely control the motor by one rotation to the entire reciprocating distance, and the performance of the recirculating valve increases in proportion to the size of the motor, and the size of the recirculating valve increases as the performance of the recirculating valve increases there was.

In addition, a cam-type exhaust gas recirculation valve can be precisely controlled, but the size of the exhaust gas recirculation valve must be comparatively large due to the application of the three-stage gear.

1 and 2 show a conventional EGR valve for a vehicle. FIG. 1 is a three-dimensional view of an easy valve, and FIG. 2 is a joint three-dimensional view of an easy valve opening / closing device.

1 and 2, the conventional idle valve is configured such that a guide bearing 235 is rotatably installed on connection rods 250 and 203, and the guide bearing 235 is mounted on the guide frame 70, And is vertically moved under the guidance of the guide frame 70.

The guide frame 70 includes a fixing portion 70a fixed to the front surface of the actuator housing 11 by a predetermined fastening member, a 'C' shaped extension portion 70b extending forward by the fixing portion 70a And a guide space part 72 provided in the extended parts 70b and 70c to receive the guide bearing 235 and guide the up and down movement of the guide bearing 235

The link members 201 and 202 include a first link member 201 coupled to a connection shaft 210 connected to an actuator, a second link member 202 pivotally coupled to the first link member 201, .

The first link member 201 and the second link member 202 have a bar shape elongated in one direction and the connection shaft 210 is formed at one end of the first link member 201, And the second link member 202 is rotatably connected to the other end of the first link member 201. [

When the connection shaft 210 rotates by the operation of the actuator 10, the first link member 201 rotates and the second link member 202 moves up or down.

The first connection rod 250 has a receiving space 250a through which the upper portion thereof is opened and the guide bearing 235 is rotatably installed in the receiving space 250a.

An upper portion of the first linking rod 250 is rotatably coupled to the second linking member 202 by a second fastening member 230, And the guide bearing 235 is engaged by the third fastening member 260.

The diameter of the guide bearing 235 is formed to be larger than the diameter of the first connection rod 250 and is in contact with the guide space portion 72 of the guide frame 70.

As the first link member 201 and the second link member 202 having a predetermined length are coupled to the connection shaft of the actuator, the gap between the connection rod 203 and the connection shaft 210 There is a problem in that the angle becomes larger and the load applied to the connecting rod becomes larger as the pressure angle increases. In order to reduce the load of the first link member and the second link member having larger pressure angles, There was a problem to be done.

Further, as the rotational force of the actuator is transmitted by the rotation of the connecting rod by means of the two link members, the pressure angle becomes large, and the impact due to the pressure angle is transmitted to the valve member, There is a problem that a space necessary for rotation of the two link members must be ensured, which leads to a problem that the size of the easy-to-open valve becomes large.

For example, the following Patent Document 1 discloses a " EGR valve for a vehicle ".

The EGR valve for a vehicle according to the following Patent Document 1 includes an actuator for providing power; A housing connected to the actuator and having a suction port and a discharge port; And an opening / closing device connected to the actuator to open / close the suction port, wherein the opening / closing device includes a link member connected to the actuator and provided to be rotatable; A connecting rod connected to the link member and partially received in the housing, the connecting rod performing a reciprocating motion in accordance with the rotation of the link member; A valve member provided at an end of the connecting rod to open and close the inlet port of the housing in accordance with the movement of the connecting rod; An elastic member that supports the connection rod between the housing and the connection rod and provides an elastic restoring force to the connection rod; a guide bearing arranged to be inserted into the connection rod; And a guide frame installed in an actuator housing accommodating the actuator to guide the up and down movement of the guide bearing.

The following Patent Document 2 discloses a method of manufacturing an EGR valve, a cam for an EGR valve, and a cam for an EGR valve.

The EGR valve and the EGR valve cam according to the following Patent Document 2 include a motor mounting portion provided with a drive motor and provided on the housing; An exhaust gas flow path formed adjacent to the motor mounting portion and provided to flow the exhaust gas discharged from the engine and provided in the housing; And a valve unit provided adjacent to the motor mounting unit and provided in the housing for selectively opening and closing the exhaust gas channel by receiving power from the driving motor.

Wherein the valve unit includes: an operation cam that is provided to receive power from the motor mounting portion and is rotatably provided in the housing; And a valve member connected to the operation cam to perform up-and-down reciprocating motion in accordance with the operation of the operation cam and selectively interrupting the exhaust gas flow path.

Wherein the valve member includes: a roller having the valve member inserted into the operating cam to perform rolling motion; A valve stem connected to the roller and moving up and down according to rotation of the operation cam; And a valve plate connected to an end of the valve stem for selectively opening and closing the exhaust gas flow path in accordance with the upward and downward movement of the valve stem.

The operating cam includes a plate portion; Wherein the guide groove has a circular cam curve extending counterclockwise starting from a virtual vertical line perpendicular to the rotation center point of the operation cam and gradually spaced from the rotation center point, As shown in FIG.

A virtual contact position between the roller and the circular cam curve due to the rotation of the front end portion cut out of the circular cam curve and a virtual contact position between the roller and the circular cam curve due to the rotation of the rear end portion cut out of the circular cam curve, Linearly changes with the rotation of the cam curve, and the contact position of the guide groove formed in the actuating cam and the roller of the valve member linearly changes in accordance with the rotation of the actuating cam, The position of the valve member is provided so as to change linearly along its longitudinal direction, and the pressure angle at a point of contact between the operating cam and the valve member is changed within a predetermined range.

The following Patent Document 3 discloses a " EGR valve for a vehicle ".

The EGR valve for a vehicle according to Patent Document 3 includes a housing; A drive motor for generating power; A power transmission unit connected to the drive motor to transmit power and configured by a plurality of gears; A rotating shaft connected to any one of the plurality of gears constituting the power transmitting portion; An operation cam connected to the rotation shaft and moving along the rotation direction of the rotation shaft and having guide grooves formed therein; A gas flow path provided in the housing is selectively opened and closed in accordance with the operation of the operation cam so that one end of the gas flow path is in contact with the upper surface of the guide groove of the operation cam, And a resilient restoring member provided between the inner wall of the housing and the power transmission unit to provide an elastic restoring force.

Wherein the elastic restoring member provides a force to push the operation cam in the downward rotation direction in a state where no power is transmitted to the operation cam by the drive motor and the power transmission unit, A body portion provided between the power transmission portion and the power transmission portion and provided in a coil shape; A first end portion provided in a support hole provided in a gear constituting the power transmission portion and a second end portion provided in a support groove provided in the inner wall of the housing.

Korea Patent Registration No. 10-1279947 (registered on June 24, 2013) Korean Patent Registration No. 10-1225682 (registered on January 17, 2013) Korean Patent Registration No. 10-1237941 (registered on February 21, 2013)

However, according to the prior art Patent No. 1, the first and second link members having a predetermined length are coupled to the connecting shaft of the actuator, so that the pressure angle formed between the connecting rod and the connecting shaft is increased There is a problem that the load applied to the connecting rod increases as the pressure angle increases and there is a problem that a guide bearing must be installed in order to reduce the loads of the first link member and the second link member having large pressure angles .

The link member according to the related art is configured such that the pressure angle is increased as the rotational force of the actuator is transmitted by the rotation of the connecting rod by the two link members by the rotation of the connecting rod, and the impact due to the pressure angle is transmitted to the valve member, There is a problem in that shock and vibration are generated, and a space required for rotation of the two link members must be ensured, which leads to an increase in the size of the idle valve.

SUMMARY OF THE INVENTION An object of the present invention is to provide an exhaust gas recirculation valve capable of reducing a pressure angle by eccentricity between a rotary shaft and a drive shaft.

Another object of the present invention is to provide an exhaust gas recirculation valve capable of increasing the power transmission by the eccentricity between the rotary shaft and the drive shaft.

It is still another object of the present invention to provide an exhaust gas recirculation valve capable of minimizing the load received in the axial direction by a small pressure angle between the rotary shaft and the drive shaft.

In order to achieve the above object, an exhaust gas recirculation valve according to the present invention includes a housing having an inlet through which exhaust gas flows, a discharge port through which exhaust gas is discharged, and a drive motor for generating rotational force, An eccentric elevating portion coupled to one end of the eccentric cam and capable of elevating and lowering at a predetermined distance from the rotary shaft, and an eccentric elevating portion coupled to the eccentric elevating portion, Wherein a pressure angle of the rotation shaft and the link is set within 0 to 30 degrees when the valve driving unit is moved up and down by the rotational force transmitting unit.

The eccentric lifting unit includes a rotation shaft coupled to one side of the eccentric cam and an eccentric cam rotatably coupled to the other side of the eccentric cam, and a link rotatably coupled to the bearing and rotatably coupled to the other end of the eccentric cam .

The eccentric cam includes an eccentric hole formed to engage the rotation shaft, a bearing fixed to the eccentric hole, and a bearing fixed to the eccentric hole, And a stopper integrally formed at an end of the arc surface to limit the movement of the roller when the eccentric cam rotates.

The link includes a rotation hole coupled to the bearing, and a slot formed to allow the roller to be elevated and lowered by a predetermined height.

The rotational force transmitting portion includes a first gear rotated by the drive motor, a second gear rotated integrally with the first gear and having a third gear having a small diameter on one surface, and a second gear integrally formed with the third gear so as to be rotatable A fourth gear, and a rotation shaft fixed to the center of the fourth gear.

The link includes a first link section and a second link section which are in surface contact with both side surfaces of the eccentric cam, and a connection section that connects the first link section and the second link section.

As described above, according to the exhaust gas recirculation valve of the present invention, since the rotary shaft and the link are provided close to the eccentric cam, the pressure angle when the eccentric cam is rotated can be reduced, And the pressure due to the rotation of the eccentric cam can be reduced. As the second hinge is moved along the slot of the link, the load due to the lifting and lowering of the valve driving unit can be reduced. In addition, the link and the first and second hinges The effect of reducing the applied stress can be obtained.

1 is a perspective view of a conventional three-
FIG. 2 is a perspective view of a conventional three-dimensional opening / closing device for an easy valve,
3 is a three-dimensional view of an exhaust gas recirculation valve according to a preferred embodiment of the present invention,
4 is an exploded perspective view showing one side of an exhaust gas recirculation valve according to a preferred embodiment of the present invention,
FIG. 5 is an exploded perspective view of the exhaust gas recirculation valve according to a preferred embodiment of the present invention,
FIG. 6 is an exploded perspective view showing a power transmitting portion of an exhaust gas recirculation valve according to a preferred embodiment of the present invention,
7 is a front view showing an elevated state of an exhaust gas recirculation valve according to a preferred embodiment of the present invention,
8 is a front view showing a state in which the exhaust gas recirculation valve is lowered according to a preferred embodiment of the present invention,
9 is a conceptual diagram showing a power transmitting portion pressure angle of an exhaust gas recirculation valve according to a preferred embodiment of the present invention.

Hereinafter, an exhaust gas recirculation valve according to a preferred embodiment of the present invention will be described in detail with reference to the accompanying drawings.

FIG. 3 is a perspective view of an exhaust gas recirculation valve according to a preferred embodiment of the present invention, FIG. 4 is an exploded perspective view of an exhaust gas recirculation valve according to a preferred embodiment of the present invention, and FIG. FIG. 6 is an exploded perspective view showing a power transmitting portion of an exhaust gas recirculation valve according to a preferred embodiment of the present invention. FIG. 6 is an exploded perspective view of an exhaust gas recirculation valve according to a preferred embodiment of the present invention.

The exhaust gas recirculation valve according to the preferred embodiment of the present invention includes a housing 110 having an inlet 115 through which exhaust gas flows, an outlet 116 through which exhaust gas is exhausted, and a driving motor 113 generating rotational force, A rotating force transmission unit 150 for rotating the rotating shaft 155 by engaging a plurality of gears by the driving motor 113 and a rotating force transmitting unit 150 for connecting the rotating shaft 155 to one side of the eccentric cam 210, And a valve driving unit 254 for moving the valve seat 254 up and down according to the elevation of the eccentric elevating unit 200. The eccentric elevating unit 200 includes a valve 230, The rotational angle of the rotational shaft 155 and the link 230 may be less than or equal to 0 ° when the valve driving unit 250 is moved up and down by the rotational force transmitting unit 150.

3 and 6, an exhaust gas recirculation valve according to an embodiment of the present invention includes an eccentric cam 210 and a link 230 installed between a rotational force transmitting portion 150 and an eccentric elevating portion 200, The pressure applied to the valve driving part 250 can be reduced by reducing the pressure angle to within 0 to 30 degrees by the valve driving part 250 and the valve driving part 250 according to the elevation of the eccentric cam 210 and the roller 237, So that it is possible to precisely control the ascending and descending of the vehicle.

The housing 110 may include a first housing 111 having a motor insertion portion 112 and a discharge passage 114 and a second housing 120 fixed to one surface of the first housing 111.

A motor inserting portion 112 capable of stably installing a driving motor 113 may be formed at the upper portion of the first housing 111. An exhaust gas may be supplied to the lower portion of the first housing 110, The discharge passage 114 can be formed.

The driving motor 113 may be mounted on the motor inserting portion 112. The driving motor 113 may be mounted on the motor inserting portion 112. The discharging passage 114 may include an inlet 115 formed at the lower end thereof and an inlet 115 formed through the inlet 115 The exhaust ports 116 for exhausting the exhaust gas may be formed adjacent to each other.

The inlet opening 115 allows the exhaust gas to be discharged through the discharge opening 116 as the inlet opening 115 is opened as the valve driving portion 250 is lifted or lowered.

The second housing 120 is mounted on one side of the first housing 111 and the housing 110 is provided with a power transmitting portion for transmitting the rotational force of the driving motor 113 to the valve driving portion 250, A rotational force transmitting portion 150 for transmitting the rotational force of the driving motor 113 to the valve driving portion 250 by the driving motor 113 and an eccentric elevating portion for reciprocating a predetermined height by the rotational force transmitting portion 150 200 may be included.

The rotational force transmitting portion 150 includes a first gear 151 that receives rotational force by a driving motor 113, a second gear 152 that engages with the first gear 151, A fourth gear 154 engaged with the third gear 153, and a rotating shaft 155 rotated by the fourth gear 154. The third gear 153 is formed on one side of the first gear 153,

 The rotation shaft 155 has a predetermined length and one side thereof is fixed to the eccentric cam 210 of the eccentric lifting unit 200 to move the link 230 of the eccentric lifting unit 200 up and down. And the other side may be provided with a magnet 157 and a hall sensor 158 so as to sense the rotation speed and the rotation angle of the rotation shaft 155.

One end of the rotation shaft 155 is fixed to the eccentric cam 210. One end of the rotation shaft 155 may be formed of a half-moon shaped key 156 having a substantially half-moon shape. This is to reduce the pressure angle by narrowing the gap between the rotation shaft 155 coupled to the eccentric cam 210 and the link 230.

That is, the half-moon key 156 rotates the eccentric cam 210 due to the rotational force of the rotating shaft 155, narrows the space between the rotating shaft 155 and the link 230, The turning radius can be shortened.

A magnet 157 having different polarities can be inserted and fixed at the other end of the rotary shaft 155 and a rotation speed and a rotation angle according to the rotation of the magnet 157 can be detected at a position adjacent to the rotary shaft 155 A Hall sensor 158 may be installed. The Hall sensor 158 may be installed on one side of a PCB substrate.

A spring 159 for returning the rotary shaft 155 to the initial state may be provided on the outer side of the rotary shaft 155. One end of the spring 159 may be fixed to the first housing 111, And the other end of the second gear 159 may be fixed to the fourth gear 154. [

The spring 159 switches the rotation shaft 155 to a state before the initial rotation when the drive motor 113 fails or the like and blocks the inlet 115 of the discharge passage 114.

The eccentric lifting unit 200 includes an eccentric cam 210 to which the rotation shaft 155 and the bearing 236 are coupled and a link 238 to which the bearing 236 is rotatably engaged and the roller 237 is coupled 230).

The eccentric lifting unit 200 is rotated at a predetermined angle by the rotational force transmitting unit 150 so that the valve driving unit 250 coupled to the eccentric lifting unit 200 can be lifted and lowered.

The eccentric cam 210 may have an eccentric hole 211 and a bearing 236 at a predetermined distance from the eccentric hole 211 so that the rotary shaft 155 may be coupled to the eccentric cam 210. The fixing hole 212 may be formed.

The outer surface of the eccentric cam 210 may have an arc surface 213 formed in a predetermined arc shape and may be raised and lowered by pressing the roller 237 which is in surface contact with the arc surface 213.

The arc surface 213 of the eccentric cam 210 is formed in a curved shape capable of raising and lowering the valve driving part 250. The arc surface 213 of the eccentric cam 210 can be vertically moved Curve.

A stopper 214 may protrude outward from one side of the eccentric cam 210, that is, an end of the arc-shaped surface 213. The stopper 214 may limit the height of the valve- May be formed at a certain point.

The link 230 is rotatably coupled to the fixing hole 212 of the eccentric cam 210. A rotation hole 231 corresponding to the fixing hole 212 may be formed at one end of the link 230, A long hole 232 having a predetermined length may be formed at the other end of the link 230.

The elongated hole 232 may disperse a load applied to the eccentric lifting unit 200 when the valve driving unit 250 is lifted or lowered. This is because the roller 237 coupled to the elongated hole 232 is supported by the eccentric lifting unit 200 to slide along the slot 232 to disperse the load.

That is, when the eccentric cam 210 rotates, the roller 237 coupled to the elongated hole 232 receives a force (external force) applied to the valve driving unit 250 installed vertically. At this time, (Stress) transmitted to the valve driving part 250 by the eccentric cam 210 can be reduced.

The link 230 has a substantially U shape and includes a first link section 233 and a second link section 234 having a predetermined length so as to be in contact with both sides of the eccentric cam 210, And the first link section 233 and the second link section 234 may be integrally formed by the lower linking section 235. [

The first link section 233 and the second link section 234 allow the load applied by the eccentric cam 210 to be dispersed and transmitted to each other by the first link section 233 and the second link section 234 .

The bearing 236 may be rotatably coupled to the fixture 212 of the eccentric cam 210 and one side of the link 230 may be rotatably coupled to the bearing 236. That is, the first hinge 238 penetrating the bearing 236 may be coupled to the rotation hole 231 of the link 230.

The first hinge 238 is coupled through the rotation hole 231 and the bearing 236 of the link 230 and the second hinge 238 is inserted into the slot 232 of the link 230 through the roller 237 And a roller 237 and a valve rod 251 can be rotatably coupled to the second hinge 239. [

The valve driving unit 250 includes a valve rod 251 having a predetermined length, a support plate 252 installed on the upper portion of the valve rod 251, and a state in which the valve rod 251 is lifted to the outside of the valve rod 251 And a spring 253 for applying an elastic force to maintain the elastic force.

The spring 253 raises the valve rod 251 when the rotational force transmitting portion 150 and the eccentric elevating portion 200 are not operated normally due to a failure of the drive motor 113, So that the flow path 114 can be blocked.

A valve seat 254 for opening and closing the inlet port 115 of the discharge passage 114 may be fixed to the lower end of the valve rod 251 and the valve seat 254 may be installed to open and close the inlet port 115.

Next, the coupling relationship of the exhaust gas recirculation valve according to the preferred embodiment of the present invention will be described in detail.

3 to 6, the exhaust gas recirculation valve according to the embodiment of the present invention forms a housing 110 surrounding the rotational force transmitting portion 150, the eccentric elevating portion 200, and the valve driving portion 250 The housing 110 forms the first housing 111 having the discharge flow path 114 and the second housing 120 corresponding to the first housing 111 as well as the drive motor 113.

A motor inserting portion 112 may be formed at an upper portion of the first housing 111 and a driving motor 113 may be installed inside the motor inserting portion 112 to rotate the rotational force transmitting portion 150.

A discharge passage 114 through which the exhaust gas can be moved is formed in the lower portion of the first housing 111. The discharge passage 114 has an inlet 115 through which the exhaust gas flows and an outlet 116 through which the exhaust gas is discharged Can be formed in directions perpendicular to each other.

The driving motor 113 is provided with a first gear 151 and a second gear 152 can be engaged with the first gear 151 and a third gear 153 can be integrally formed.

The fourth gear 154 may be coupled to the third gear 153 by a predetermined arcuate length and the rotary shaft 155 may be fixed to the fourth gear 154 by a predetermined length.

The eccentric cam 210 of the eccentric lifting unit 200 may be installed at one end of the rotary shaft 155 and the semi-arcuate key 156 may be formed at one end of the rotary shaft 155 to transmit rotational force. This reduces the size of the eccentric cam 210 and reduces the installation distance between the rotation shaft 155 and the link 210 so that the eccentric cam 210 is formed by the rotation shaft 155 and the link 210 when the eccentric cam 210 rotates. The pressure angle can be reduced.

A Hall sensor 158 for sensing the rotation speed and the rotation angle of the magnet 157 in accordance with the rotation of the magnet 157 may be provided at the other end of the rotation shaft 155, Can be installed.

The eccentric lifting unit 200 is rotated by a predetermined angle by the rotation shaft 155 of the rotational force transmitting unit 150 to move the valve driving unit 250 up and down.

The eccentric cam 210 of the eccentric lifting unit 200 may form an eccentric hole 211 to which the half-moon key 156 of the rotary shaft 155 is inserted and fixed. And a fixing hole 212 to which the link 230 is coupled can be formed at a remote position.

The eccentric hole 211 and the fixing hole 212 are formed relatively close to each other so that the distance between the eccentric hole 211 and the fixing hole 212 becomes close to each other, So that the pressure angle with the link 210 is made small.

As the pressure angle is formed as described above, the load (external force) applied to the valve driving part 250 due to the rotation of the eccentric cam 210 can be reduced.

A bearing 236 may be rotatably coupled to the fixing hole 212 to couple the link 230 to the bearing 236 and a first hinge 238 may be coupled to the bearing 236 to allow the link 230 to rotate .

That is, the rotation hole 231 of the link 230 can be engaged with the first hinge 238 in a state in which it coincides with the bearing 236, and the first link section The second hinge 239 can be coupled to the valve rod 251 while the roller 237 is sandwiched between the first link 233 and the second link 234.

The roller 237 may be mounted on the eccentric cam 210 so as to move up and down along the arc surface 213 of the eccentric cam 210. The roller 237 may be provided with an eccentric cam 210 As shown in FIG.

The valve driving part 250 opens and closes the discharge flow path 11 formed in the lower part of the first housing 111. The valve driving part 250 can form a valve rod 251 having a predetermined length, The support plate 252 supporting the spring 253 can be fixed to the upper portion of the support plate 251.

A spring 253 for raising the valve rod 251 can be provided on the bottom surface of the support plate 252 and a valve seat 254 for opening and closing the inlet port 115 is fixed to the lower end of the valve rod 251 .

3 to 9, a method of operating the exhaust gas recirculation valve according to a preferred embodiment of the present invention will be described in detail.

FIG. 7 is a front view showing an elevated state of an exhaust gas recirculation valve according to a preferred embodiment of the present invention, FIG. 8 is a front view showing a state in which an exhaust gas recirculation valve according to a preferred embodiment of the present invention is lowered, Is a conceptual diagram showing a power transmitting portion pressure angle of an exhaust gas recirculation valve according to a preferred embodiment of the present invention.

3 to 9, the exhaust gas recirculation valve according to the preferred embodiment of the present invention includes a first hinge 239 and a second hinge 239, The stress applied to the first hinge 138 and the second hinge 139 is reduced.

As a result, the stress is reduced in the link 230 and the valve driving part 250, the power transmission by the rotation shaft 155 can be enhanced, and the opening / closing responsiveness of the valve seat 254 is improved, But it can be made good.

The first gear 151 of the rotational force transmitting portion 150 is rotated as the drive motor 113 is rotated by the applied power source and the second gear 152 and the third gear 153 is rotated and the fourth gear 154 engaged with the third gear 153 is rotated, so that the rotation shaft 155 is rotated.

This drive motor 113 causes the fourth gear 154 to be rotated in the forward and reverse directions by using a motor that is normally or reversely rotated.

The magnet 157 is fixed to the rotary shaft 155 so that the rotation speed and the rotation angle of the rotary shaft 155 are sensed by the hall sensor 158 in accordance with the rotation of the magnet 157.

The height of the valve driving part 250 can be adjusted by adjusting the speed and the rotation angle of the rotary shaft 155 in accordance with the rotation speed and the rotation angle of the valve seat 254. In accordance with the elevation of the valve driving part 250, The height can be adjusted.

The eccentric cam 210 rotates about the center of the semi-arcuate key 156 of the rotary shaft 155 to the center of the eccentric cam 210, .

7 and 8, the rotation center of the eccentric cam 210 rotates with reference to a virtual center point located on the right side of the half-moon key 156 in the drawing, and the rotation center of the eccentric cam 210 is rotated The bearing 236 and the link 230 coupled to the fixing hole 212 rise.

At this time, the link 230 and the bearing 236 are rotated based on the center point of the rotation axis 155. The rotation hole 231 of the link 230 descends while rotating clockwise from the center point of the rotation axis 155.

As the link 230 is lowered, a force is applied to lower the valve rod 251 of the valve driving part 250 and the first hinge 238 of the eccentric cam 210 and the valve rod 251 of the valve rod 251, So that a force is applied to the two hinges 239.

As the eccentric cam 2101 rotates, the second hinge 239 raises the valve driving part 250, so that the rotating force of the rotating shaft 155 is converted into the potential energy for lifting the valve driving part 250, Stress is generated in the first hinge 238 and the second hinge 239, which are nodes to be transmitted.

Since the second hinge 239 is movably coupled to the elongated hole 232 of the link 230 so that the rotational energy is applied to the valve driving part 250, (232).

The second hinge 239 is slid by the force applied to the valve rod 251 via the link 230 from the eccentric cam 210. The sliding of the second hinge 239 causes the eccentric cam 210 And the load applied to the link 230 are reduced.

That is, as the second hinge 239 slides along the slot, the load applied to the link 230 is reduced, and in particular, the load applied to the second hinge 239 is reduced.

The pressure angle formed between the rotary shaft 155 and the first hinge 238 based on the second hinge 239 may be formed within an angle of about 20 to 30 degrees with the first hinge 238 Since the distance between the half-moon key 156 coupled to the eccentric hole 211 of the eccentric cam 210 and the first hinge 238 coupled to the fixing hole 212 is short and smooth, It is possible to raise and lower the valve driving part 250 well.

As a result, the load applied to the link 230 of the eccentric lifting unit 200 is reduced, so that the damage or deformation of the link 230 can be reduced, and the valve rod 251 The valve seat 254 can be raised and lowered more smoothly and smoothly.

Although the present invention has been described in detail with reference to the above embodiments, it is needless to say that the present invention is not limited to the above-described embodiments, and various modifications may be made without departing from the spirit of the present invention.

110: housing 111: first housing
112: motor inserting section 113: drive motor
114: Exhaust flow path 115: Inlet port
116: exhaust port 120: second housing
150: rotational force transmitting portion 151: first gear
152: second gear 153: third gear
154: fourth gear 155:
156: Band key 157: Magnetic
158: Hall sensor 159: Spring
200: eccentric lifting portion 210: eccentric cam
211: eccentric hole 212: fixing hole
213: arc surface 214: stopper
230: Link 231: Rotating hole
232: long hole 233: first link section
234: second link section 235: connection section
236: Bearing 237: Roller
238: first hinge 239: second hinge
250: valve driving part 251: valve rod
252: Support plate 253: Spring
254: Valve seat

Claims (6)

A housing having an inlet through which the exhaust gas flows, an outlet through which the exhaust gas is discharged, and a drive motor for generating a rotational force,
A rotational force transmitting portion for rotating the rotational shaft by engaging a plurality of gears by the driving motor,
An eccentric lifting unit coupled to one side of the eccentric cam and coupled to the lifting and lowering position at a predetermined distance from the rotation axis,
And a valve driving part for moving the valve up and down in accordance with the elevation of the eccentric elevating part,
And a pressure angle of the rotation shaft and the link is formed within 0 to 30 degrees when the valve driving unit is moved up and down by the torque transmission unit. The method according to claim 1,
The eccentric lifting unit includes a rotation shaft coupled to one side and an eccentric cam having a bearing rotatably coupled to the other side,
And a link that is rotatably coupled to the bearing at one end and is coupled to the other end so that the roller can be elevated. 3. The method of claim 2,
The eccentric cam may include an eccentric hole formed to engage the rotation shaft,
A fixing hole formed to be engaged with the eccentric watch from the eccentric hole and formed adjacent to the eccentric hole so that a pressure angle when the link rotates is small,
An arc surface for raising and lowering the roller by surface contact of the roller when the eccentric cam is rotated,
And a stopper integrally formed at an end of the arc surface to limit the ascending and descending of the roller. 3. The method of claim 2,
The link includes a rotation hole coupled to the bearing,
And an elongated hole formed to allow the roller to be elevably engaged by a predetermined height. The method according to claim 1,
The rotational force transmitting portion includes a first gear rotated by the driving motor,
A second gear rotatably engaged with the first gear and integrally formed with a third gear having a small diameter on one surface thereof,
A fourth gear rotatably engaged with the third gear,
And a rotating shaft fixed to the center of the fourth gear. 3. The method of claim 2,
The link includes a first link section and a second link section which are in surface contact with both side surfaces of the eccentric cam,
And a connection section connecting the first link section and the second link section.

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