KR101662534B1 - Structure for restraining movement of leaf-spring type variable valve - Google Patents

Abstract

BACKGROUND OF THE INVENTION 1. Field of the Invention [0001] The present invention relates to a flow control structure of a variable valve for controlling an exhaust gas, and more particularly, And a plate spring mounted between the valve spring cover and the valve cover to press the valve cover and face the valve cover, wherein a pair of guide holes are formed at both ends of the plate spring support portion And a guide pin is formed on the upper end of the hinge support to be inserted into the guide hole. The valve spring is prevented from being detached due to the constraint condition of the guide pin even if welding failure occurs. The flow restriction structure of the leaf spring variable valve is prevented.

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention [0001] The present invention relates to a valve-

The present invention relates to a flow restraining structure for a variable valve for controlling exhaust gas, and more particularly, to a valve control apparatus for an exhaust valve that improves assembly / productivity by using guide pins and guide holes, A valve pin, and a lower hole to facilitate positioning of the leaf spring and prevent the leaf spring from flowing.

Generally, a variable valve is used for controlling a flow rate of a fluid such as a liquid or a gas, and is operated in such a manner that the valve cover (gate) is opened or closed depending on the fluid pressure of the fluid.

One example of the use of such a variable valve is a disc-shaped variable valve mounted inside a muffler installed in an exhaust system of a vehicle to control the flow of exhaust gas.

Since the exhaust gas that is burned in the engine of the vehicle is very hot and its speed is almost the same as the speed of sound, it emits intense heat when released into the atmosphere. Therefore, it is possible to lower the exhaust gas temperature and pressure on the exhaust gas passage of the vehicle, A separate silencer is mounted.

In general, the silencer is formed in a tubular shape having a predetermined size, and a plurality of pipes and baffles are installed therein to induce expansion, resonance, and sound absorption of the exhaust gas when the exhaust gas flows, .

On the other hand, in such a muffler, when the exhaust resistance is increased to reduce the exhaust noise, the resistance of the engine is lowered due to the increase of the resistance applied to the exhaust stroke, that is, the back pressure, and conversely, .

In order to solve such a problem, a silencer having a variable valve installed therein is developed and used so as to increase the back pressure in the low speed section where the exhaust noise is a problem, and to lower the back pressure in the middle and high speed sections where the engine output becomes a problem .

1 is a perspective view showing a state of a conventional variable valve.

1, a conventional variable valve comprises a housing 1 coupled to a baffle forming a wall to partition the internal space of a pipe or silencer mounted inside a muffler (not shown), and a housing 1 And a valve cover (2) hinged to open and close the formed opening.

The valve cover 2 is rotatably mounted on a shaft 3 a mounted on one side of the housing 1 and one end of the shaft 3a is in contact with the valve cover 2, The torsion spring 3 elastically urging the torsion spring 3 is inserted.

When the pressure of the exhaust gas exceeds the elastic force of the torsion spring 3, the valve cover 2 is opened. When the pressure of the exhaust gas is smaller than the elastic force of the torsion spring 3, (2) is closed.

That is, the variable valve is closed in the low speed section to attenuate the low frequency noise, gradually open in the middle and high speed sections to attenuate the high frequency noise and reduce the resistance of the exhaust gas, so that the output of the engine is not affected .

However, conventionally, in the conventional variable valve, the spring characteristic is remarkably reduced in a use environment of a certain high temperature or higher, and a precise flow rate control is impossible, and when the valve is opened beyond the designed value, interference with peripheral components occurs.

Further, the conventional variable valve does not strongly support the behavior of the valve cover 2 because one end of the torsion spring 3 is simply point-contacted to support the valve cover 2, Unusual sound) is generated.

Further, when the torsion spring 3 used in the conventional variable valve is replaced with a leaf spring in order to solve such a problem, there is a problem that it is difficult to accurately position the plate spring when assembling the valve spring, There is a problem that the leaf spring is caused to flow back and forth, right and left.

SUMMARY OF THE INVENTION The present invention has been conceived to solve the problems of the conventional art described above, and it is an object of the present invention to provide an apparatus and a method for assembling a plate spring supporting unit in which a guide pin formed at an upper end of a hinge supporting unit is inserted into a guide hole formed at both ends of a plate spring supporting unit, In which the plate spring is prevented from being detached by the constraint condition of the guide pin even when the welding strength of the plate spring is remarkably improved and the welding failure occurs.

Further, according to the present invention, since the support pin formed on the plate spring support portion and the valve pin formed on the valve cover can be inserted into the upper hole and the lower hole of the plate spring, respectively, Another object of the present invention is to provide a flow restraining structure for a leaf spring variable valve in which the leaf spring is prevented from being released even if valve cover is opened / closed repeatedly.

The technical objects to be achieved by the present invention are not limited to the above-mentioned technical problems, and other technical subjects which are not mentioned can be clearly understood by those skilled in the art from the description of the present invention .

According to an aspect of the present invention, there is provided a valve cover comprising: a valve cover rotatably coupled to a housing having an opening formed on one side thereof and a hinge support formed on the other side thereof; And a leaf spring mounted between the valve spring support and the valve cover coupled to the other side of the housing to press the valve cover and face-contact with the valve cover; A pair of guide holes are formed at both ends of the plate spring support portion, and a guide pin is formed at an upper end of the hinge support portion so as to be inserted into the guide hole.

Further, the flow restraining structure of the leaf spring variable valve according to the embodiment of the present invention may include: a first seating part formed on an upper surface of the valve cover; And a second seating part formed on a lower surface of the plate spring supporting part; And the leaf spring is preferably constrained such that the lower surface thereof is inserted into the first seat portion and the upper surface thereof is inserted into the second seat portion.

According to another aspect of the present invention, there is provided a flow restraining structure for a leaf spring variable valve, comprising: a support pin protruding downward from a second seating portion of the plate spring supporting portion; And an upper hole penetrating the upper surface of the leaf spring corresponding to the position of the support pin; .

According to another aspect of the present invention, there is provided a flow restraining structure for a leaf spring variable valve, comprising: a valve pin protruding upward from one side of the valve cover; And a lower hole formed through the lower surface of the leaf spring corresponding to the position of the valve pin; .

Further, the flow restraining structure of the leaf spring variable valve according to the embodiment of the present invention may include: a support pin protruding downward from the second seating portion of the plate spring supporting portion; An upper hole penetratingly formed on an upper surface of the leaf spring corresponding to the position of the support pin; A valve pin protruding upward from one side of the valve cover; And a lower hole formed through the lower surface of the leaf spring corresponding to the position of the valve pin; And the support pin and the valve pin are disposed so as to face each other on the same line.

Further, in the flow restraining structure of the leaf spring variable valve according to the embodiment of the present invention, it is preferable that the upper bent portion is bent toward the valve cover direction on the upper surface of the leaf spring to prevent excessive opening of the valve cover.

Further, the flow restraining structure of the leaf spring variable valve according to the embodiment of the present invention includes: a housing protrusion protruding from the rear end of the housing so that the rear end of the valve cover can be caught when the valve cover is closed; And it is preferable that the opening of the housing is not completely closed even when the valve cover is closed by the housing projection.

According to the present invention having the above-described structure, the assembling / productivity of the leaf spring variable valve is remarkably improved and at the same time, the leaf spring is prevented from coming off due to the welding defect, There is an effect that the lateral flow is suppressed.

Specifically, since the guide pin formed in the housing is inserted into the guide hole formed in the plate spring support portion, the plate spring support portion, the housing, and the leaf spring can be precisely positioned when assembled. Therefore, assembly / productivity is significantly improved, There is an effect that the leaf spring can not be released by the constraint condition of the guide pin even if a welding failure occurs at a portion where the spring support portion is engaged.

Further, according to the present invention, the support pin and the valve pin are formed on the plate spring support portion and the valve cover, respectively, and the upper and lower holes are formed in the plate spring, so that the components can be assembled at precise positions, , The leaf spring can be kept in a fixed position without detaching even if the valve cover is repeatedly opened and closed.

In addition, according to the present invention, since the leaf spring can support the valve cover over a large area, there is an effect that the joint due to the trembling of the variable valve itself is remarkably reduced.

Further, according to the present invention, a valve cover supporting method based on a whole leaf spring instead of a valve cover supporting method, which is dependent on one strand of a torsion spring like a conventional variable valve, is used, There are advantages.

In addition, the present invention has an upper bent portion formed on the upper surface of the leaf spring so as to bend downward, thereby preventing an excessive opening of the valve cover, thereby remarkably reducing the interference phenomenon with peripheral components.

In addition, according to the present invention, the housing protrusion is formed at the rear end of the housing to prevent the valve cover from completely sealing the opening of the housing, thereby completely preventing the touching caused by the valve cover and the housing from colliding with each other.

1 is a perspective view showing a state of a conventional variable valve.
BACKGROUND OF THE INVENTION Field of the Invention [0001] The present invention relates to a valve spring,
3 is a perspective view showing a state of a housing according to an embodiment of the present invention;
4 is a perspective view showing a state of a plate spring support unit according to an embodiment of the present invention.
FIG. 5A is a perspective view illustrating a plate spring according to an embodiment of the present invention viewed from above. FIG.
FIG. 5B is a perspective view showing a state in which the leaf spring according to one embodiment of the present invention is viewed from below. FIG.
6 is a cross-sectional view taken along line AA 'of FIG. 2;
7 is a perspective view showing a valve cover and a housing when the valve cover is closed according to an embodiment of the present invention;

Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings in order that the present invention can be easily carried out by those skilled in the art. The present invention may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein.

In order to clearly illustrate the present invention, parts not related to the description are omitted, and the same or similar components are denoted by the same reference numerals throughout the specification.

In addition, terms and words used in the present specification and claims should not be construed to be limited to ordinary or dictionary meanings, and the inventor should properly define the concept of the term to describe its invention in the best way. It should be construed as meaning and concept consistent with the technical idea of the present invention.

FIG. 2 is a perspective view showing the overall structure of a flow restraining structure of a leaf spring variable valve according to an embodiment of the present invention, and FIG. 3 is a perspective view illustrating a housing according to an embodiment of the present invention.

The valve spring variable valve according to the embodiment of the present invention is rotatably coupled to the housing 10 having the opening 10a at one side and the hinge support 12 at the other side, A leaf spring 30 which is mounted between the valve cover 20 and the valve cover 20 and presses the valve cover and is in surface contact with the valve cover, .

3, a circular opening 10a is formed in one side (left side in the illustrated embodiment) of the housing 10 so that exhaust gas can pass therethrough, and the other side of the housing 10 A pair of hinge supporting portions 12 are formed to face each other.

A shaft 16 is inserted into the hinge support 12 and a disk-shaped valve cover 20 is rotatably coupled to the shaft 16 to open or close the opening 10a of the housing.

A plate spring 30 is installed between the plate spring support portion 40 and the valve cover 20 so that the valve cover 30 is fixed to the valve cover 20, As shown in Fig.

The leaf spring 30 functions to provide an elastic force to the valve cover 20 in a direction to close the valve cover 20 so that the valve cover 20 can prevent the pressure of the exhaust gas from being lower than the elastic force of the leaf spring 30 And is opened when the pressure of the exhaust gas is higher than the elastic force of the leaf spring 30.

The upper surface 32 of the leaf spring is in surface contact with the leaf spring support 40 and the lower surface 36 of the leaf spring is in surface contact with the valve cover 20, There is an effect that the joint due to the vibration of the valve cover itself is reduced because it is more strongly supported than that supported by the conventional torsion spring (3 in Fig. 1).

The plate spring support 40 is typically joined to the housing 10 by welding. However, when the plate spring supporting portion 40 is fixed only by welding, if the welding failure occurs, the plate spring supporting portion is detached and the plate spring can not effectively press the valve cover.

The present invention is characterized in that a pair of guide holes 42 are formed through both ends of the plate spring supporting portion 40 and a guide pin 14 is protruded from the upper end of the hinge supporting portion 12, Can be inserted into the guide hole 42.

Accordingly, the plate spring support portion 40 is more easily and precisely coupled to the housing 10, and even if a welding failure occurs, the guide pin 14 restrains the plate spring support portion 40, .

A first seating part 22 is protruded from the upper surface of the valve cover 20 so that the lower surface 36 of the leaf spring can be inserted therein. The second seating portion 44 is recessed with a width equal to the width.

The lower surface 36 of the leaf spring is inserted into the space defined by the first seating portion 22 and the upper surface 32 of the leaf spring is engaged with the second seating portion 44, So that the seat surface is restrained.

Thus, by assembling the leaf spring 30 through the seat restraint, there is no need for a separate bolting or welding engagement to engage the leaf spring, and thermal shock and durability of the leaf spring are prevented from being reduced.

FIG. 4 is a perspective view illustrating a plate spring support unit according to an embodiment of the present invention. FIG. 5A is a perspective view illustrating a plate spring according to an embodiment of the present invention, FIG. 6 is a cross-sectional view taken along line AA 'of FIG. 2. FIG. 6 is a perspective view showing the plate spring according to one embodiment of the present invention.

As shown in the figure, a support pin 46 protrudes downward from the second seating portion 44 of the plate spring support 40, and a support pin 46 is formed on the upper surface 32 of the plate spring. The upper hole 34 is formed in correspondence with the position of the upper hole 34. [

7, a valve pin 24 protrudes toward the upper side of the valve cover 20, and a lower surface of the valve spring 20 36, the lower hole 38 is formed so as to correspond to the position of the valve pin.

When the plate spring 30 is assembled, the support pin 46 is inserted into the upper hole 34 and the valve pin 24 is inserted into the lower hole 38, And even when the valve cover is repeatedly opened and closed, the leaf spring does not move back and forth, left and right, and is completely restrained.

The diameter of the upper hole 34 is preferably substantially equal to or slightly larger than the diameter of the support pin 46 in consideration of the tolerance and the diameter of the lower hole 38 is also set to be larger than the diameter of the valve pin 24 The diameter of the protruding portion is preferably equal to or slightly larger than the diameter of the protruding portion.

6, it is preferable that the support pin 46 and the valve pin 24 are disposed so as to face each other on the same line. More preferably, (16). Accordingly, the assembling / productivity of the leaf spring is maximized, and the effect of suppressing the forward, backward, leftward, and rightward flow of the leaf spring is also maximized.

The upper bent portion 32a is formed on the upper surface 32 of the leaf spring 30 so as to be bent downward so as to prevent the valve cover 20 from being excessively opened, as in the illustrated embodiment. .

Specifically, the upper bent portion 32a is bent downward from the end of the upper surface 32 of the leaf spring by about 90 degrees, and then is further curled inward by about 90 degrees.

The lower end of the upper bent portion 32a is held in contact with the lower surface 36 of the leaf spring when the valve cover 20 is opened, , The valve cover can be prevented from opening excessively.

At this time, the distance between the lower end of the upper bent portion 32a and the lower surface 36 of the leaf spring is determined by the arrangement relationship between the variable valve and the peripheral components, the spring characteristics of the leaf spring, But it is preferable that the distance is approximately a half of the height of the upper bent portion 32a.

This is because if the distance between the lower end of the upper bent portion 32a and the lower surface 36 of the plate spring is greater than half the height of the upper bent portion 32a, the effect of limiting the excessive opening of the valve cover becomes insufficient, If the distance between the lower end of the valve seat 32a and the lower surface 36 of the leaf spring is closer to half than the height of the upper bent portion 32a, the opening of the valve cover is excessively restricted and the resistance (back pressure) Because.

7 is a perspective view illustrating a valve cover and a housing when the valve cover is closed according to an embodiment of the present invention.

As shown in the figure, a housing protrusion 18 protruding from the rear end of the housing 10 prevents the valve cover 20 from moving when the valve cover 20 is closed.

The housing protrusion 18 is configured to be spaced from the rear end of the valve cover 20 when the valve cover 20 is opened and can be brought into contact with the rear end of the valve cover when the valve cover 20 is closed. Extending from the rear end to the rear, and then being bent in an 'a' shape.

When the valve cover 20 is closed by the resilient force of the leaf spring 30, the housing protrusion 18 restricts the closing action of the valve cover 20 due to the excessive elastic force, And the housing 10 are prevented from colliding with each other.

A cushioning portion 26 made of SUS MAT material is attached to the rear end portion of the valve cover 20 contacting the housing protrusion 18 to prevent a joint generated from direct contact with the housing protrusion.

The housing protrusion 18 is designed so that when the valve cover 20 is closed, the valve cover is substantially in close contact with the housing 10, and the gap between the valve cover 20 and the housing 10 is slightly spaced ) Are formed on the substrate. That is, even when the valve cover 20 is closed, the opening 10a of the housing is not completely closed.

It will be apparent to those skilled in the art that various modifications and variations can be made in the present invention without departing from the spirit or scope of the invention. Will be apparent to those of ordinary skill in the art.

10: Housing
10a: opening
12: Hinge support
14: Guide pin
16: Shaft
18: Housing projection
20: Valve cover
22: first seat portion
24: Valve pin
26: buffer
30: leaf spring
32: upper surface of the leaf spring
32a: upper bent portion
34: upper hole
36: Lower surface of leaf spring
38: Lower hole
40: Plate spring support
42: Guide hole
44: second seat portion
46: Support pin

Claims (7)

A valve cover rotatably coupled to a housing having an opening on one side and a hinge support on the other side to open and close the opening; And
A leaf spring mounted between the leaf spring support portion coupled to the other side of the housing and the valve cover to press the valve cover and to be in surface contact with the valve cover; ≪ / RTI >
A pair of guide holes are formed at both ends of the plate spring support portion, a guide pin is formed at an upper end of the hinge support portion so as to be inserted into the guide hole,
The leaf spring including an upper surface contacting the leaf spring support and a lower surface contacting the valve cover,
An upper bent portion is formed on the upper surface of the leaf spring so as to be curved toward the lower surface and curled inward again,
And the lower end of the upper bent portion is contacted with the lower surface of the leaf spring when the valve cover is opened to prevent excessive opening of the valve cover.
The method according to claim 1,
A first seat formed on an upper surface of the valve cover; And
A second seating part formed on a lower surface of the plate spring supporting part; Further comprising:
Wherein the leaf spring has a lower surface inserted into the first seating portion and an upper surface inserted into the second seating portion to be constrained.
3. The method of claim 2,
A support pin protruding downward from a second seating portion of the plate spring support portion; And
An upper hole penetratingly formed on an upper surface of the leaf spring corresponding to the position of the support pin; Further comprising: a flow restriction structure of the leaf spring variable valve.
4. The method according to any one of claims 1 to 3,
A valve pin protruding upward from one side of the valve cover; And
A lower hole formed through the lower surface of the leaf spring corresponding to the position of the valve pin; Further comprising: a flow restriction structure of the leaf spring variable valve.
3. The method of claim 2,
A support pin protruding downward from a second seating portion of the plate spring support portion; An upper hole penetratingly formed on an upper surface of the leaf spring corresponding to the position of the support pin; A valve pin protruding upward from one side of the valve cover; And a lower hole formed through the lower surface of the leaf spring corresponding to the position of the valve pin; Further comprising:
Wherein the support pin and the valve pin are arranged to face each other on the same line.
delete The method according to claim 1,
A housing protrusion protruding from a rear end of the housing so that a rear end of the valve cover can be caught when the valve cover is closed; Further comprising:
And the opening of the housing is not completely closed even when the valve cover is closed by the housing projection.

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