KR101237942B1 - An egr valve for a vehicle - Google Patents

Abstract

PURPOSE: An EGR(Exhaust Gas Recirculation) valve for a vehicle is provided to prevent inflow of foreign matters in exhaust gas by a sealing member. CONSTITUTION: An EGR(Exhaust Gas Recirculation) valve for a vehicle comprises a driving unit(400), a valve rod, a valve casing(100), and a sealing unit. The driving unit comprises a solenoid(410) and a plunger(420). The plunger moves by an electromagnetic force generated by the solenoid. The valve rod is connected to the plunger. The valve casing comprises an insertion hole, a gas inlet(101), and a gas outlet(102). The valve rod is inserted into the insertion hole. The sealing unit is formed between the outer surface of the valve rod and the inner surface of the insertion hole.

Description

An EGR valve for a vehicle}

The present invention relates to an EGR valve for a vehicle, and more particularly, an object of the present invention is to provide an EGR valve capable of preventing sliding of the valve rod in the EGR valve and improving the function of the sealing unit.

In general, the most widely used method of suppressing the generation of NOx generated from the exhaust gas exhausted from the engine installed in an automobile is EGR (Exhaust), which sucks a portion of the cooled exhaust gas into the cylinder in addition to the mixer. Gas Recirculation) valve is used.

As shown in FIG. 2 of Korean Patent Application Publication No. 10-2009-034962, the EGR valve includes a valve casing provided at a driving unit and a lower portion of the driving unit and having an inlet through which exhaust gas is introduced and an outlet through which exhaust gas is discharged. It is provided with a valve rod inserted into the casing and moved up and down by the drive unit, and a valve plate provided on the valve rod to selectively communicate with or shut off the inlet and the outlet, thereby selectively circulating the exhaust gas.

The drive unit includes a solenoid composed of a coil and a plunger inserted between the solenoids and moving up and down by an electromagnetic force provided by the solenoid.

Here, the lower end of the plunger may be connected to the upper end of the valve rod to guide the vertical movement of the valve rod.

An insertion hole into which the valve rod is inserted extends upward and downward in an upper portion of the valve casing, and a bush and a sealing unit are respectively provided between the outer circumferential surface of the valve rod and the inner surface of the insertion hole.

The bush is disposed below the sealing unit and extends to the outlet, and the sealing unit is located on the upper side of the insertion port of the valve casing.

The bush is slidably inserted in the valve rod, thereby minimizing the frictional resistance during sliding friction with the valve rod, thereby preventing foreign substances such as carbon contained in the exhaust gas from flowing in the direction of the driving portion.

The sealing unit is provided on the upper portion of the bush and serves to restrain foreign substances such as carbon of the exhaust gas from flowing in the direction of the driving unit.

Normally, the sealing unit is made of an elastic material such as rubber or silicon and is formed in a ring shape surrounding the outer circumferential surface of the valve rod. The entire valve casing becomes a high temperature state by the heat of the high temperature exhaust gas, and continuously When exposed, the shape or material of the sealing unit is deformed.

In particular, as the valve rod moves in the vertical direction, the inner diameter portion of the sealing unit is sucked into the movement trajectory of the valve rod, thereby increasing the friction area between the valve rod and the sealing unit, thereby increasing the sliding load of the valve rod, thereby increasing energy consumption. There was a problem.

In addition, when the sealing unit is deformed, the outer diameter shrinks, so that the sealing function is lowered, whereby foreign matters such as carbon contained in the exhaust gas move toward the driving unit.

SUMMARY OF THE INVENTION The present invention has been made to solve such a problem, and an object thereof is to provide an EGR valve for a vehicle which can improve the sealing function of the sealing unit and can suppress an increase in sliding load of the valve rod by the sealing unit.

The present invention for achieving the object, the drive unit consisting of a solenoid consisting of a coil and a plunger provided to be movable by the electromagnetic force generated by the solenoid;

A valve rod connected to the plunger; A valve casing into which the valve rod is inserted and a gas inlet and a gas outlet are disposed;

And a sealing unit provided between an outer circumferential surface of the valve rod and an inner circumferential surface of the insertion hole, wherein the sealing unit includes a sealing housing having a ring shape disposed on the inner circumferential surface of the insertion hole; A sealing member disposed inside the sealing housing and provided to contact an outer circumferential surface of the valve rod to perform a sealing function; It provides a vehicle EGR valve comprising a support member inserted into and supporting the sealing member so that the sealing member can be located inside the sealing housing.

The insertion hole is provided to extend in the extending direction of the valve rod, and further comprising a guide bush provided in the lower portion of the insertion hole to guide the valve rod to the slide movement, the sealing unit is the upper portion of the guide bush It is characterized in that provided on the side.

It further comprises a locking jaw provided on the inner circumferential surface of the insertion hole, characterized in that the sealing unit is seated on the locking jaw is disposed.

The sealing housing is configured to have an annular body and a space formed therein; A first through hole formed in one surface of the body part; It includes a second through hole formed on the other surface of the body portion, wherein the inner diameter of the first through hole is formed larger than the outer diameter of the valve rod, characterized in that formed smaller than the inner diameter of the second through hole.

The edge of the second through hole is characterized in that the supporting jaw is provided that can be supported by a portion of the sealing member.

The sealing member is provided in a ring shape, the sealing member is an outer diameter portion provided in contact with the inner surface of the sealing housing; It is connected to the outer diameter portion is provided to be bent relative to the outer diameter portion and includes an inner diameter portion provided in contact with the outer peripheral surface of the valve rod, characterized in that the support member is inserted between the outer diameter portion and the inner diameter portion. .

The outer diameter portion and the interval between the inner diameter portion is characterized in that it becomes wider from the top to the bottom.

The support member may be provided in a ring shape and inserted into the fixing space, thereby limiting the movement of the inner diameter portion to fix the position of the inner diameter portion regardless of the movement of the inner diameter portion of the sealing member generated when the valve rod moves. It is characterized in that to provide a suppressive force.

An upper portion of the outer circumferential surface of the support member may be inclined to be in contact with the outer diameter portion.

A driving unit comprising a solenoid composed of a coil and a plunger movably provided by an electromagnetic force generated by the solenoid;

A valve rod connected to the plunger; A valve casing into which the valve rod is inserted and a gas inlet and a gas outlet are disposed; And a sealing unit provided between an outer circumferential surface of the valve rod and an inner circumferential surface of the insertion hole, wherein the sealing unit includes a sealing housing having a ring shape disposed on the inner circumferential surface of the insertion hole; A sealing member disposed inside the sealing housing and provided to contact an outer circumferential surface of the valve rod to perform a sealing function; And a support member inserted into the sealing housing together with the sealing member and supporting the sealing member so that the shape deformation or positional change of the sealing member in the sealing housing is limited. do.

The sealing member is provided in a ring shape, the sealing member is an outer diameter portion provided in contact with the inner surface of the sealing housing; It is connected to the outer diameter portion is provided to be bent relative to the outer diameter portion and provided with contact with the outer peripheral surface of the valve rod, and provided between the outer diameter portion and the inner diameter portion that the support member is inserted and fixed It features.

The outer diameter portion is disposed between the sealing housing and the support member is characterized in that the position change or its shape deformation is limited irrespective of the position change or shape deformation of the inner diameter portion.

The support member is disposed to be forced in the sealing housing, it characterized in that it is provided to provide a forcing force on the surface of the sealing member to prevent the contraction of the sealing member.

According to the present invention, the shrinkage of the sealing member is suppressed to the maximum, thereby preventing the sealing function from being weakened, thereby preventing the invasion of foreign substances such as carbon of the exhaust gas.

This is because the outer diameter portion of the sealing member is suppressed to the maximum from the deformation of its position and shape by the support member.

That is, despite the movement of the inner diameter portion of the sealing member according to the movement of the valve rod, the outer diameter portion can maintain the contact state with the interior of the sealing housing can smoothly perform the airtight action.

On the other hand, since the upper end of the sealing member, that is, the connecting portion connecting the inner diameter portion and the outer diameter portion by the support member is pressed, a forcing force may be provided on the surface of the sealing member to prevent the contraction of the sealing member.

Therefore, the inner diameter portion of the valve rod is prevented from excessively curling into the movement trajectory (up and down direction) of the valve rod by the pressing action of the support member.

Thereby, there is another technical effect that the sliding load can be prevented from being increased by preventing excessive friction between the inner diameter and the outer diameter of the valve rod.

1 is a schematic diagram of an engine system to which an EGR valve is applied.
2 is a cross-sectional view of an EGR valve according to the present invention.
FIG. 3 is an enlarged view of a portion A in FIG. 2.
FIG. 4 is an enlarged view of a portion B in FIG. 2.
5 is an exploded view of the sealing unit according to the present invention.
Figure 6 shows a closed state in the EGR valve according to the present invention.
Figure 7 shows the open state in the EGR valve according to the present invention.

Hereinafter, embodiments of the present invention will be described with reference to the accompanying drawings.

As shown in FIG. 1, the EGR valve 10 according to the present invention connects between the exhaust pipe 2 and the intake pipe 3 of the engine 1.

The EGR valve 10 serves to guide the inside of the intake pipe 3 by bypassing a part of the exhaust gas moving along the exhaust pipe of the engine.

The EGR valve 10 is connected to the ECU 5 and is controlled by the ECU 5. The ECU 5 controls the EGR valve 10 in consideration of the speed, load, and temperature of the vehicle. Guide the exhaust gas of the engine 1 to be selectively re-introduced into the engine (1).

2 is a side sectional view of an EGR valve 10 according to the present invention.

The EGR valve 10 according to the present invention includes a valve casing 100 in which a gas inlet 101 and a gas outlet 102 are formed, and an inflow passage 201 surrounding the valve casing 100. ) And a discharge part 202 is formed in the housing 200, the valve portion 300 is inserted into the valve casing 100, the drive unit connected to the valve unit 300 to operate the valve unit 300 400.

Hereinafter, a detailed configuration of each part will be described.

The driving unit 400 is a solenoid 410 consisting of a coil wound and the solenoid 410 is surrounded by the solenoid 410 performs a linear motion (up and down or left and right movements) by the electromagnetic force provided from the solenoid 410 Plunger 420.

A cover 430 is provided on an upper portion of the solenoid 410 and an upper portion of the plunger 420, and an upper inner side surface of the solenoid 410 and an upper outer surface of the plunger 420 are provided below the cover 430. The bush 440 supporting the is provided.

The lower portion of the solenoid 410 and the plunger 420 is provided with a flange 450 for supporting them, and the valve casing 100 is disposed below the flange 450.

FIG. 3 is an enlarged view of a portion A in FIG. 2.

As shown in FIG. 3, the valve casing 100 is provided with an insertion hole 110 into which the valve part 300 is linearly inserted.

The valve unit 300 includes a valve rod 310 connected to the plunger 420 by a predetermined connection member 105, a first valve plate 311 and a second valve plate 301 provided on the valve rod 301. The valve plate 312 is provided.

The first valve plate 311 and the second valve plate 312 are spaced apart from each other, and are provided to be seated on the valve seats 131 and 132 provided in the valve casing 100.

A first spring 321 in the form of a coil spring is provided between the first valve plate 311 and the second valve plate 312.

The first spring 321 provides a supporting force so that the first valve plate 311 and the second valve plate 312 maintain a constant interval.

The upper portion of the valve casing 100 is provided with a chamber portion 140 surrounding the insertion hole 110, the chamber portion 140 is a second spring 322 to elastically support the valve portion 300 itself. Is provided.

A support plate 330 is provided on an upper side of the valve rod 301, and one end (upper end) of the second spring 322 contacts the support plate 330.

On the other hand, the other end (lower end) of the second spring 322 is in contact with the lower surface of the chamber 140.

Accordingly, the second spring 322 may be disposed between the support plate 330 and the lower surface of the chamber 140 to elastically support the valve 300 itself in an upward direction.

When the plunger 420 is lowered by the electromagnetic force of the solenoid 410 and the valve part 300 itself is lowered to thereby open the first and second valve plates 311 and 312, the second spring 322 is opened. ) Is compressed.

However, when the solenoid 410 is no longer supplied with power and is extinguished by electromagnetic force, the force that compresses the second spring 322 disappears, so that the valve unit 300 is raised by the elastic restoring force, thereby The first and second valve plates 311 and 312 are closed.

A protruding wall 150 is formed in the chamber 140, and the insertion hole 110 is formed at the center of the protruding wall 150.

The insertion hole 110 is provided to extend along an arrangement direction of the valve rod 301.

The sealing unit 500 and the guide bush 600 are provided between the inner circumferential surface of the insertion hole 110 and the outer circumferential surface of the valve rod 301.

The guide bush 600 is provided to extend in the direction of the discharge port 102 in a state disposed on the inner peripheral surface of the insertion hole (110).

The guide bush 600 guides the slide movement of the valve rod 301 and serves to guide the friction to be minimized.

In FIG. 3, a sealing unit 500 is provided in region B. Referring to FIG.

The sealing unit 500 is composed of a combination that is provided in a ring shape as a whole.

In order to install the sealing unit 500, a locking step 111 on which the sealing unit 500 may be seated is provided at the inlet side of the insertion hole 110.

Therefore, a part of the lower surface of the sealing unit 500 may be seated on and supported by the locking step 111.

As shown in FIG. 4, the structure of the sealing unit 500 includes a sealing housing 100 constituting its exterior, a sealing member 520 provided inside the sealing housing 100, and the sealing. The support member 530 is inserted into the member 520 and the outer circumferential surface thereof is internally provided in the sealing housing 510.

The sealing housing 510 has a body portion 511, a first through hole 512 formed at the center of the upper surface of the body 511, and a second through hole formed at the center of the lower surface of the body 510. 513, wherein the sealing member 520 and the support member 530 are inserted between the first through hole 512 and the second through hole 513, and the valve rod 301 penetrates. The space portion 514 is formed.

The sealing member 520 is implemented in the form of a ring, the cross section is bent and folded state.

The inner diameter portion 521 of the sealing member 520 is provided to contact the outer peripheral surface of the valve rod 301, the outer diameter portion 522 of the sealing member 520 is in contact with the inner peripheral surface of the sealing housing 510. To be prepared.

Meanwhile, a support jaw 515 protruding in the center direction is provided on an inner circumferential surface of the sealing housing 510, and the support jaw 515 supports the lower end of the outer diameter portion 522 of the sealing member 520. Play a role.

The outer diameter portion 522 and the inner diameter portion 521 of the sealing member 520 is bent to form a connection portion 523 to which the upper end is connected.

Lower ends of the outer diameter portion 522 and the inner diameter portion 521 are spaced apart, and the support member 530 is inserted between the spaced spaces to support the sealing member 520.

The gap between the outer diameter portion 522 and the inner diameter portion 521 is widened from the upper side to the lower side, which makes the insertion of the support member 530 more smooth, and also the inner diameter portion 521 and the valve. This is to minimize contact friction between the rods 301.

When the valve rod 301 moves in the up and down direction, the inner diameter portion 521 of the sealing member 520 also moves in contact with it. At this time, the support member 530 moves between the inner diameter portion 521 and the outer portion. By pressing the connection between the neck portion 522 to suppress the movement of the inner diameter portion 521 to the outer diameter portion 522.

Therefore, the outer diameter portion 522 can be suppressed to the maximum change in position and shape.

If the support member 530 is not present, the sealing member 520 itself is rolled up by the movement trajectory of the valve rod 301 to release the contact state between the sealing member 520 and the sealing housing 510, thereby sealing. The original role of the member 520 is not smoothly sealed.

Therefore, a substance such as carbon contained in the exhaust gas may leak in the direction of the driving unit, and the sliding load of the valve rod 301 also increases, so that the energy consumption is increased and further, the overcurrent can be supplied.

By the way, when the sealing member 520 is supported by the support member 530 in this way, the shape or position of the sealing member 520 can be suppressed from being deformed, thereby preventing the above problem from occurring.

As shown in FIG. 5, when assembling the sealing unit 500, the assembler inserts the support member 530 below the sealing member 520, and then inserts the supporting member 530 into the sealing housing 510. It may be inserted and inserted into the two through holes 513.

The inner diameter of the first through hole 512 of the sealing housing 510 may be larger than the outer diameter of the valve rod 301 and smaller than the inner diameter of the second through hole 513.

The upper outer circumferential surface 531 of the support member 530 is preferably formed to be inclined, in order to increase the contact area with the inner surface of the outer diameter portion 522 of the sealing member 520 and to insert more smoothly. to be.

The lower outer circumferential surface 532 of the support member 530 is provided in a vertical form, and this portion is provided to be fitted in a forced press-fit form to the support jaw 515 of the sealing housing 510.

Meanwhile, through-holes 524 and 533 through which the valve rod 301 passes are formed in the sealing member 520 and the support member 530.

Hereinafter, an operation of the present invention will be described with reference to the accompanying drawings.

As shown in FIG. 6, in a state where power is not supplied to the solenoid 410, the valve rod 301 and the plunger 420 are forced upward by a supporting action of the second spring 322. Receives.

As a result, the first valve plate 311 and the second valve plate 312 maintain a closed state that blocks the inlet 101 and the outlet 102 and are seated on each valve seat.

At this time, the inner diameter portion 521 of the sealing member 520 is in contact with the outer peripheral surface of the valve rod 301, the outer diameter portion 522 of the sealing member 520 is the sealing housing 510 Maintain contact with the inner circumferential surface of the

When power is supplied to the solenoid 410 in this state, electromagnetic force is generated from the solenoid 410, and as shown in FIG. 7, the plunger 420 and the valve rod 301 are thereby lowered. .

As the valve rod 301 is lowered, the first and second valve plates 311 and 312 are lowered to be spaced apart from the valve seat.

As a result, the inlet port 101 and the outlet port 102 communicate with each other, and the exhaust gas entering the inlet port 101 moves to the outlet port 102 and moves to the inlet pipe of the engine.

By the movement of the valve rod 301, the inner diameter portion 521 of the sealing member 520 may move in accordance with the movement direction of the valve rod 301.

However, the outer diameter portion 522 of the sealing member 520 is suppressed to the maximum deformation of its position and shape by the support member 530.

Therefore, despite the movement of the inner diameter portion 521 according to the movement of the valve rod 301, the outer diameter portion 522 can maintain a contact state with the interior of the sealing housing 510 to smoothly perform an airtight action. can do.

Since the upper end of the sealing member 520 is pressed by the support member 530, a forcing force may be provided on the surface of the sealing member 520 to prevent the sealing member 520 from contracting.

In addition, since the inner diameter portion 521 is prevented from being excessively curled into the movement trajectory of the valve rod 301 by the pressing action of the support member 530, the inner diameter portion 521 and the valve rod 301 are prevented. There is an advantage that it is possible to prevent the sliding load is increased by preventing excessive friction between the outer diameter.

10: EGR valve 100: valve casing
200: housing 300: valve portion
301: valve rod 400: drive unit
500: sealing unit 510: sealing housing
520: sealing member 530: support member

Claims (13)

A driving unit comprising a solenoid composed of a coil and a plunger movably provided by an electromagnetic force generated by the solenoid;
A valve rod connected to the plunger;
A valve casing into which the valve rod is inserted and a gas inlet and a gas outlet are disposed;
It includes a sealing unit provided between the outer peripheral surface of the valve rod and the inner peripheral surface of the insertion hole,
The sealing unit has a ring-shaped sealing housing disposed on the inner peripheral surface of the insertion hole;
A sealing member disposed inside the sealing housing and provided to contact an outer circumferential surface of the valve rod to perform a sealing function;
And a support member supporting the sealing member so that the sealing member can be positioned inside the sealing housing,
The sealing member is provided in the form of a ring,
The sealing member has an outer diameter portion provided in contact with the inner surface of the sealing housing; It is connected to the outer diameter portion is provided to be bent relative to the outer diameter portion and includes an inner diameter portion provided in contact with the outer peripheral surface of the valve rod,
The support member is inserted between the outer diameter portion and the inner diameter portion,
The support member is provided in the form of a ring is inserted into the space between the outer diameter portion and the inner diameter portion,
EGR valve for a vehicle, characterized in that to provide a restraining force to fix the position of the inner diameter by limiting the movement of the inner diameter portion irrespective of the movement of the inner diameter portion of the sealing member generated during the movement of the valve rod. The method of claim 1,
The insertion hole is provided to extend in the extending direction of the valve rod,
Further provided in the lower portion of the insertion hole and the guide bush for guiding the valve rod slides,
The sealing unit is a vehicle EGR valve, characterized in that provided on the upper side of the guide bush. The method of claim 1,
Further comprising a locking jaw provided on the inner peripheral surface of the insertion hole,
EGR valve for a vehicle, characterized in that the sealing unit is seated on the locking jaw. The method of claim 1,
The sealing housing is configured to have an annular body and a space formed therein; A first through hole formed in one surface of the body part;
It includes a second through hole formed on the other surface of the body portion,
The inner diameter of the first through hole is larger than the outer diameter of the valve rod, the vehicle EGR valve, characterized in that formed smaller than the inner diameter of the second through hole. 5. The method of claim 4,
EGR valve for a vehicle, characterized in that the support jaw is provided on the edge of the second through-hole is supported by a portion of the sealing member is caught. delete The method of claim 1,
EGR valve for a vehicle, characterized in that the gap between the outer diameter portion and the inner diameter portion is widened from the upper portion to the lower portion.
delete The method of claim 1,
The upper portion of the outer circumferential surface of the support member is inclined so as to be in contact with the outer diameter portion EGR valve for a vehicle. A driving unit comprising a solenoid composed of a coil and a plunger movably provided by an electromagnetic force generated by the solenoid;
A valve rod connected to the plunger;
A valve casing into which the valve rod is inserted and a gas inlet and a gas outlet are disposed;
It includes a sealing unit provided between the outer peripheral surface of the valve rod and the inner peripheral surface of the insertion hole,
The sealing unit has a ring-shaped sealing housing disposed on the inner peripheral surface of the insertion hole;
A sealing member disposed inside the sealing housing and provided to contact an outer circumferential surface of the valve rod to perform a sealing function;
And a support member inserted into the sealing housing together with the sealing member and supporting the sealing member so that the deformation or positional change of the sealing member in the sealing housing is limited.
The sealing member is provided in the form of a ring,
The sealing member has an outer diameter portion provided in contact with the inner surface of the sealing housing; Is connected to the outer diameter portion is provided to be bent relative to the outer diameter portion and includes an inner diameter portion provided in contact with the outer peripheral surface of the valve rod,
EGR valve for a vehicle, characterized in that provided between the outer diameter portion and the inner diameter portion and the support member is inserted and fixed. delete The method of claim 10,
The outer diameter portion is disposed between the sealing housing and the support member, EGR valve for a vehicle, characterized in that the position change or its shape deformation is limited irrespective of the position change or shape deformation of the inner diameter portion. The method of claim 10,
The support member is disposed to be forced to the sealing housing, the vehicle EGR valve, characterized in that provided to provide a forcing force on the surface of the sealing member to prevent the contraction of the sealing member.

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