KR100444848B1 - Changeable valve apparatus for muffler - Google Patents

Abstract

An object of the present invention is to reduce the exhaust cross-sectional area of the exhaust gas to reduce low-frequency exhaust booming noise during low speed operation of the engine, and to maximize the exhaust gas discharge cross-sectional area without losing the back pressure during high-speed operation of the engine, thereby reducing the engine output To provide a variable valve device for a muffler that can prevent.

To this end, the present invention includes a plate valve which is installed to rotate the pivot axis around the hinge axis in the exhaust gas direction change pipe of the muffler to adjust the cross-sectional area of the exhaust gas flow path according to the operating conditions of the engine;

A torsion spring installed on the hinge shaft such that the plate valve exerts a force in a direction of blocking the exhaust gas diverting pipe against the exhaust gas pressure;

A movable piece extending from the plate valve to the rear opposite the plate valve about the hinge axis;

A fixed piece extending further from said exhaust gas direction conversion pipe than said movable piece;

Both ends of the movable piece and the fixed piece are respectively restrained by the movable hinge and the fixed hinge,

A clothespin-shaped turnover spring that accumulates elastic force when the plate valve is opened; It consists of

The movable hinge is located on an upper side of an axis line (limit line) connecting the fixed hinge and the hinge shaft when the plate valve is closed.

Description

Changeable valve apparatus for muffler

The present invention relates to a variable valve device for a muffler for preventing the output of the engine.

In order for the engine to operate, a mixer is introduced into the cylinder and burned to obtain power and then discharge the gas after combustion.

The exhaust system consists of an exhaust manifold that collects exhaust gas from each cylinder, an exhaust pipe that exhausts the exhaust gas collected by the exhaust manifold into the atmosphere, and a muffler installed in the middle of the exhaust pipe to reduce exhaust noise. It is.

The silencer is a device for lowering the exhaust noise by lowering the temperature and pressure of the exhaust gas discharged from the engine. As shown in FIG. 6, the silencer is made of a cylinder 1 having a diameter of about 1 mm, and the inside of the cylinder 1 is closed. A plurality of partitions (2) (3). Some rooms (4) (5) (6)… And the exhaust gas inlet pipe 7 connected to the exhaust manifold side to introduce the exhaust gas into the cylinder 1 and the exhaust gas introduced through the exhaust gas inlet pipe 7 is redirected to the front side. And a divert pipe 8 for directing diffusion to the formed space 4 and the like, and an exhaust gas outlet pipe 9 connected to the tail pipe side for discharging the gas back to the rear of the gas. have.

However, according to the above structure, the exhaust gas is discharged through the exhaust gas diverting pipe 8 which is designed to be more suitable for the constant speed and the high speed driving of the engine during idle and low speed operation, where the generation of exhaust noise and vibration is higher than at high speed. When the exhaust noise (low frequency booming noise) is increased.

For this reason, as shown in FIG. 7, the variable valve apparatus 10 is attached to the exhaust gas direction change pipe 8, and the variable valve apparatus 10 is carried out at the time of idle and low speed operation | movement with a low amount of exhaust gas, and low exhaust pressure. The low frequency exhaust booming noise is reduced by closing the exhaust gas diverting pipe 8 and reducing its opening amount.

As the driving speed of the engine increases and the exhaust gas pressure increases, the plate valve 11 of the variable valve device 10 linearly increases the opening amount of the exhaust gas diverting pipe 8 in proportion to the high pressure and high speed. By reducing the exhaust resistance of the exhaust gas to be discharged to ensure that the exhaust gas smoothly.

However, in the above-described method, since the plate valve 11 is always in force in the closing direction by the return spring 12, the opening amount must be reduced by the elasticity of the return spring 12, so that the exhaust gas must be discharged quickly. It is pointed out that the problem of lowering the engine output by increasing the back pressure in high speed and high load operation (compared to the case without the valve itself) is achieved.

Accordingly, the present invention has been made in view of the above-mentioned points, and its object is

When the engine is running at low speed, the exhaust cross-sectional area of the exhaust gas is reduced to reduce the low frequency exhaust booming noise.In the high-speed operation of the engine, the exhaust gas exhaust cross-sectional area can be maximized without losing the back pressure, which can prevent the engine output from falling. The present invention provides a variable valve device for a muffler.

The present invention to achieve the above object

A plate valve installed in the exhaust gas direction change pipe of the muffler to rotate about the hinge axis as a center point to adjust the cross-sectional area of the exhaust gas discharge path according to the operating conditions of the engine;

A torsion spring installed on the hinge shaft such that the plate valve exerts a force in a direction of blocking the exhaust gas diverting pipe against the exhaust gas pressure;

A movable piece extending from the plate valve to the rear opposite the plate valve about the hinge axis;

A fixed piece extending further from said exhaust gas direction conversion pipe than said movable piece;

Both ends of the movable piece and the fixed piece are respectively restrained by the movable hinge and the fixed hinge,

A clothespin-shaped turnover spring that accumulates elastic force when the plate valve is opened; It consists of

The movable hinge is located on an upper side of an axis line (limit line) connecting the fixed hinge and the hinge shaft when the plate valve is closed.

1 is a front sectional view of a variable valve device for a muffler according to the present invention.

2 is a plan view of the in-phase variable valve device

3 is a view showing an open state in the low and medium speed operation section of the variable valve device according to the present invention.

4 is a view showing an open state during high speed operation of the variable valve device according to the present invention.

5 is a graph showing the relationship between the external force and the spring restoring force

6 is a view showing a muffler to which a conventional variable valve device is applied.

7 is a prior art

※ Explanation of code for main part of drawing

8 exhaust gas diverting pipe 11 plate valve

12: torsion spring 14: variable valve device

15: hinge shaft 16: movable piece

17: fixed piece 18: turnover spring

19: movable hinge 20: fixed hinge

X-X: Axis (limit line)

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

Figure 1 is a front sectional view showing a variable valve device for a muffler according to the present invention, Figure 2 is a plan view of the in-phase variable valve device with reference to the same reference numerals 6 and 7 with the same reference numerals. Instead.

In the figure, the variable valve device for the muffler is indicated by the sign 14.

Reference numeral 8 in the drawings is a separate part (referred to as an exhaust gas redirecting pipe for convenience of description) that is the exhaust gas redirecting pipe itself or a short-length pipe body that is inserted into and connected to form a part of the pipe body.

Reference numeral 11 denotes a plate valve 11 for adjusting the opening amount of the exhaust gas direction change pipe 8 by rotating the hinge shaft 15 to the pivot point.

A torsion spring 12 is fitted to the hinge shaft 15, and the torsion spring 12 is always installed so that the plate valve 11 is applied to the direction in which the valve 11 blocks the direction change pipe 8. When (11) is rotated and opened, the restoring force is accumulated inside.

A movable piece 16 is provided which extends from the one side of the plate valve 11 past the hinge shaft 15 and protrudes rearward from the one side of the plate valve 11. An extending fixing piece 17 projects beyond the hinge shaft 15 and further rearwards (the left side in the state of illustration) of the movable piece 16.

On both sides of the movable piece 16 and the fixed piece 17, both end portions of turn over springs 18 (turn over springs, names of springs commonly used in clutch pedals), which are shaped like clothespins, are movable. It is restrained by 19 and the fixed hinge 20. As shown in FIG. The turn-over spring 18 extends toward the movable hinge 19 side of the movable piece 16 toward one side of the coil portion 18a, the end of which is constrained to the movable hinge 19, and the turn-over spring ( On the other side of 18, it extends toward the fixing hinge 20 of the fixing piece 17, the end of which is constrained to the fixing hinge 20. In particular, in order to form a phase difference between the movable side connecting end 18b and the fixed side connecting end 18d, the outer side of the coil part 18a between the other side of the coil part 18a and the fixed side connecting end 18d. An outward extension portion 18c extending toward the predetermined length is formed.

The movable hinge 19 moves along the trajectory of the arc drawing about the hinge axis 15 with the rotational operation of the plate valve 11 while the fixed hinge 20 always maintains a fixed position without change.

In addition, the movable hinge 19 is positioned above the axis line (or the limit line) XX passing through the hinge shaft 15 and the fixed hinge 20 while the plate valve 11 is closed. It has a motion to be crossed with its axis XX as a reference line.

The turnover spring 18 accumulates the elastic force therein whenever the plate valve 11 is opened, but the action of the elastic force is whether the movable hinge 19 is located on the upper side or the lower side of the axis XX. This shows the opposite trend.

More specifically, the torsion spring 12 is provided while the movable hinge 19 is still positioned above the axis XX (based on the state shown) when the plate valve 11 is rotated to open the pipe 8. ) And the direction of action of the elastic force of the turnover spring 18 is the same to give a rotation moment in the direction of closing the plate valve 11, but the plate valve 11 is opened a lot, the movable hinge 19 of the axis (XX) When moved to the lower side (see FIG. 4), a rotation moment in the opposite direction to the torsion spring 12 is generated, that is, the elastic force of the turnover spring 18 causes a force to be applied in the direction in which the plate valve 11 is opened. Will be.

And the elastic force of the torsion spring 12 is set larger than the turnover spring (18).

The operation of the present invention will be described below.

When an idle load of an engine having a low exhaust gas pressure is greater than the exhaust gas pressure, the torsion spring 12 and the turnover spring 18 have larger resilience, so the valve valve 11 is closed and the exhaust gas has a minimum opening gap T. Is discharged through.

In this initial state, when the engine rpm is increased to gradually increase the speed to the low medium speed region, the opening amount of the plate valve 11 is linearly increased in association with the increased exhaust gas pressure, and the spring restoring force (torsion spring and turn) The sum of over spring restoring force) increases linearly up to the threshold H of FIG. 5.

In addition, when the spring force reaches the limit H, the movable hinge 19 is positioned at the limit line X-X line as shown in FIG. 3 (mode 1 section).

When the engine is higher than this speed, the opening amount of the plate valve 11 is further increased by the exhaust gas pressure, and the movable hinge 19 moves below the limit line X-X.

In such a state, the elastic force acting from the turnover spring 18 is opposite to the torsion spring 12 (the torsion spring generates a clockwise moment based on the state shown, but the turnover spring is counterclockwise). The total moment of spring restoring force (torsion spring-turnover spring restoring force) decreases (see Mode 2 section in Figs. 4 and 5).

This means that in the mode 2 section, the open amount of the plate valve 11 becomes larger under the same exhaust gas pressure.

When the exhaust gas pressure is reduced in this state, the plate valve 11 rotates in the closing direction due to the restoring force of the torsion spring 12.

The present invention as described above, in addition to the configuration of the variable valve device of the conventional muffler acts to reduce the valve opening amount during the low-speed operation of the engine, the elastic force to increase the valve opening amount when entering the high-speed operation beyond the reference speed By providing a turnover spring which acts on the engine, it is possible to reduce the low frequency exhaust booming noise by increasing the spring restoring force at the engine idle and the low medium speed to reduce the valve opening amount, and the low frequency exhaust booming noise is relatively low. In small high speed operation, the spring restoring force is reduced to increase the opening amount of the valve, thereby reducing the back pressure and improving the engine output.

Claims (5)

A plate valve is installed on the exhaust gas diverting pipe of the muffler to rotate the hinge axis about the center point to adjust the cross-sectional area of the exhaust gas according to the operating conditions of the engine, and the plate valve is the exhaust gas diverting pipe facing the exhaust gas pressure. A torsion spring installed on the hinge shaft to exert a force in a direction to cut off the movable member; a movable piece extending from the plate valve toward the rear opposite the plate valve about the hinge axis; and the movable piece from the exhaust gas direction conversion pipe. For the muffler further comprises a fixed piece extending further rearward, and a turn-over spring, both ends of the movable piece and the fixed piece are respectively bound by the movable hinge and the fixed hinge and accumulates an elastic force when the plate valve is opened. In the variable valve device, The turn-over spring 18 has a movable side connecting end 18b extending from one end of the coil portion 18a to the other end of the coil portion 18a to be restrained by the movable hinge 19, and the other side of the coil portion 18a. Fixed side connection end (18d) is formed so that the end is restrained by the fixed hinge 20, An outward extension 18c for forming a phase difference between the movable side connecting end 18b and the fixed side connecting end 18d between the other side of the coil unit 18a and the fixed side connecting end 18d is provided. The predetermined length is extended to the outside of the coil portion 18a, The position of the movable hinge 19 is set to be located on the upper side of the axis line (XX line, limit line) connecting the fixed hinge 20 and the hinge shaft 15 when the plate valve 11 is closed. Variable valve device for a muffler, characterized in that the. delete delete delete delete