KR100448775B1 - exhaust brake system for vehicles - Google Patents

Abstract

BACKGROUND OF THE INVENTION 1. Field of the Invention [0001] The present invention relates to an exhaust brake device for a motor vehicle, wherein a butterfly valve for opening or closing an internal passage of an exhaust pipe is replaced with a piston valve, and a malfunction of the operation due to thermal expansion of a member due to high temperature exhaust gas. In addition to eliminating the problem, the control mechanism for driving the piston valve is installed in a simplified structure inside the exhaust pipe to extend the service life of the parts.

In order to achieve the above object, the present invention provides a magnetic communication device for communicating an air supply line (8) between an air storage tank (6) in which compressed air is stored and an exhaust pipe (9) in accordance with an operation of the exhaust brake operation switch (2). In the vehicle exhaust brake apparatus provided with the valve (5), a pressure chamber (22) forming a predetermined closed space inside the exhaust pipe (9), and a piston provided to be movable in the pressure chamber (22). 24 and an exhaust brake valve body 20 having a valve plate 26 coupled to one end of the piston 24 to close the exhaust pipe 9, the pressure chamber 22 is provided. It is characterized in that it is configured to receive compressed air from the magnetic valve 5 to switch the exhaust passage from the open state to the closed state.

Description

Exhaust brake system for vehicles

The present invention relates to an exhaust brake device for an automobile, and more particularly, to solve a structural problem in which a butterfly valve of an exhaust brake due to a high temperature exhaust gas is fixed on an exhaust pipe path so that a return is not possible. An exhaust brake apparatus is provided.

In general, a heavy vehicle with a heavy load such as a truck is provided with an exhaust brake device for decelerating downhill or high speed driving by assisting a foot brake, which is a main brake device, and the exhaust brake device is an exhaust manifold. In the exhaust pipe in communication with the exhaust gas discharged into the atmosphere after combustion is forcibly suppressed to obtain the braking force by allowing the engine to work as a compressor, by selectively opening and closing the inner passage of the conventional exhaust pipe An electrically-air exhaust brake device adapted to electrically control the air while using compressed air is as shown in FIG. 1.

That is, the exhaust brake operation switch 2 which is to be operated by the driver when the exhaust brake is operated from the battery 1, which is the on-board power supply of the vehicle, is connected to the exhaust brake operation switch 2 when the driver accelerates the accelerator pedal during driving. When the pressure is applied, the accelerator switch 3 is connected to release the connection, and the clutch switch 4 is connected to the accelerator switch 3 so that the connection is released when the driver presses the clutch pedal while the vehicle shifts. On the other hand, the magnetic valve 5 which is opened and closed when the power of the battery 1 is applied to the clutch switch 4 is connected.

In addition, the magnetic valve 5 is supplied with a high-pressure compressed air from the compressor to the air storage tank (6) to be stored therein, and a power chamber configured to repeat the operation and release through the force of the compressed air ( 7) is installed on the air supply line (8) connecting between, the power chamber 7 is mechanically via the butterfly valve (9a) and the link member (10) installed in the exhaust pipe (9) It is connected.

Here, the butterfly valve (9a) is coupled to the rotating shaft (9b) to rotate by receiving the operating force from the link member 10 in the exhaust pipe (9) as shown in FIG.

On the other hand, the exhaust brake operation switch 2 is a Normal Off Type switch, while the accelerator switch 3 and the clutch switch 4 are a Normal On Type switch.

In addition, a pilot bulb 11 is connected to the exhaust brake operating switch 2, so that when the exhaust brake operating switch 2 is turned on, the pilot bulb 11 receives power from the battery 1 so as to be turned on. It is.

In addition, a return spring 12 is installed in the link member 10 connected to the operating rod 7a of the power chamber 7 to open and close the butterfly valve 9a embedded in the exhaust pipe 9. Therefore, the link member 10 is returned to its original state when the operation is released.

Therefore, when a driver driving a commercial vehicle turns on the exhaust brake operating switch 2 to decelerate a vehicle speed while driving down a slope or driving at a high speed on the road, the exhaust brake operating switch 2 is connected to an internal contact. The power of 1) is applied to the magnetic valve 5 through the accelerator switch 3 and the clutch switch 4, and the magnetic valve 5 is supplied with the air storage tank 6 and the power chamber ( 7) is operated to communicate the air supply line (8) connecting between, so that the air in the air storage tank (6) is introduced into the power chamber (7), the operating rod of the power chamber (7) 7a) rotates the butterfly valve 9a mounted inside the exhaust pipe 9 by moving the link member 10 to close the inside of the exhaust pipe 9, thereby to the atmosphere through the exhaust pipe 9 to the atmosphere. Strengthen the flow of exhaust gases Zero restraint is performed to operate the exhaust brake device.

At this time, when the driver shifts or depresses the accelerator pedal or the clutch pedal for acceleration, the internal contact of the accelerator switch 3 or the clutch switch 4 is released and the battery 1 is applied to the magnetic valve 5. Since the power is cut off, the magnetic valve 5 exhausts the compressed air supplied to the power chamber 7 from the air storage tank 6 to the power chamber 7 through the air supply line 8 and discharges it to the atmosphere. Stop the brakes.

In addition, when the driver turns off the exhaust brake operation switch 2, the operation of the exhaust brake is stopped in the same manner as above.

By the way, in the conventional exhaust brake apparatus comprised as mentioned above, the butterfly valve 9a is interlocked with the said power chamber 7 so that the butterfly valve 9a installed in the exhaust pipe 9 may be driven. As the control device, which collectively refers to the overall mechanism including the link member 10 for rotating the external type, is mounted, the situation causing frequent performance and durability problems.

This is due to the high temperature heat between the inner wall of the exhaust pipe 9 and the outer circumferential surface of the butterfly valve 9a as the temperature of the exhaust gas discharged through the exhaust pipe 9 is about 750 ° C. or higher. This is due to the inability to release the operation due to mutual fixation through the thermal expansion of the member.

In addition, the butterfly valve 9a in the exhaust pipe 9 causes variation in the closing amount in closing the internal passage of the exhaust pipe 9 according to the back pressure fluctuation of the engine, which causes instability of performance. Done.

That is, the butterfly valve 9a causes a problem of pinching between the exhaust pipe 9 due to heat deformation due to the high temperature exhaust gas during operation, and when the operation is released, the return becomes poor, and the exhaust pipe ( The fluctuation of the back pressure of the exhaust gas discharged through 9) causes instability of performance due to the variation in the closing amount of the butterfly valve 9a, and the durability of the component due to the lack of heat resistance of the butterfly valve 9a is increased. There is a problem of deterioration.

Accordingly, the present invention has been made in view of the above, and replaces the butterfly valve for opening or closing the internal passage of the exhaust pipe with a piston valve, which is caused by the thermal expansion of the member by the hot exhaust gas. The present invention provides an exhaust brake device for a vehicle that can eliminate the malfunction and to prolong the service life of parts by installing a control mechanism for driving the piston valve in a simplified structure inside the exhaust pipe. There is a purpose.

The present invention for achieving the above object, in the exhaust brake device of a vehicle having a magnetic valve for communicating the air supply line between the air storage tank and the exhaust pipe is stored compressed air in accordance with the operation of the exhaust brake operation switch, An exhaust brake valve having a pressure chamber for forming a predetermined closed space inside the exhaust pipe, a piston movably installed in the pressure chamber, and a valve plate coupled to one end of the piston to close the exhaust pipe. A sieve is provided, and the pressure chamber is configured to receive compressed air from the magnetic valve so as to switch the exhaust passage from the open state to the closed state.

1 is a block diagram showing an exhaust brake device of a conventional vehicle.

2 is a cross-sectional view showing the main part of FIG.

3 is a cross-sectional view showing the configuration of an exhaust brake valve body that is a main portion of an exhaust brake apparatus according to the present invention;

4 is a cross-sectional view showing a first body part which is a component of the exhaust brake valve body shown in FIG. 3 and a right side view thereof;

FIG. 5 is a sectional view of a second body that is a component of the exhaust brake valve body shown in FIG. 3 and a left side view thereof;

6 is a cross-sectional view showing an operating state of the exhaust brake valve body shown in FIG. 3;

<Description of Symbols for Main Parts of Drawings>

1-Battery 2-Exhaust Brake Operation Switch

3-Accel Switch 4-Clutch Switch

5-Magnetic Valve 6-Air Storage Tank

7-Power Chamber 8-Air Supply Line

9-Exhaust Pipe 10-Link Member

20-Exhaust brake valve body 22-Pressure chamber

24-piston 26-valve plate

28-return spring 30-first body

32-second body part 34-cylinder

36-supply line 38-first support member

40-shield plate 42-second support member

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

3 is a cross-sectional view showing the configuration of an exhaust brake valve body which is a main part of the exhaust brake apparatus according to the present invention, and FIG. 4 is a cross-sectional view showing a first body part which is a component of the exhaust brake valve body shown in FIG. 5 is a cross-sectional view showing a second body that is a component of the exhaust brake valve body shown in FIG. 3 and a left side view thereof, and FIG. 6 shows an operating state of the exhaust brake valve body shown in FIG. It is a cross-sectional view, and for the detailed description of the present invention will be described with additional reference to Figure 1 showing a conventional exhaust brake device.

As shown in the drawings, the present invention is connected to the battery (1), the exhaust brake operation switch (2) operated by the driver during the operation of the exhaust brake, and the exhaust brake operation switch (2) sequentially connected to the accelerator pedal And magnetic switch (3) and clutch switch (4), each of which is to be disconnected during the operation of the clutch pedal and the clutch switch (4), the magnetic valve which opens and closes according to the power supply of the battery (1). (5), the air storage tank (6) for supplying the high pressure compressed air stored therein on the air supply line (8) in accordance with the opening of the magnetic valve (5), which is supplied through the air supply line (8) In an exhaust brake device for closing the exhaust passage of the exhaust pipe (9) via the power chamber (7), which is activated and released through the compressed air, and the compressed air supplied through the power chamber (7), In addition to providing a piston valve inside the exhaust pipe 9, a control device for operating the piston valve through the compressed air supplied from the magnetic valve 5 is provided in the exhaust pipe 9. It is installed inside.

That is, according to the present invention, a control device which is located outside the exhaust pipe 9 in the conventional exhaust brake device to open and close the exhaust passage is provided inside the exhaust pipe 9, and the conventional exhaust pipe 9 It is a configuration that replaces the butterfly valve (9a) is installed in the interior of the exhaust passage to facilitate opening and closing of the piston valve. The power chamber 7 is excluded from the conventional exhaust brake device.

To this end, the piston-type valve supplies high-pressure compressed air in the air storage tank 6 from the power chamber 7 through the magnetic valve 5 which is opened according to the operation of the exhaust brake operating switch 2. And an exhaust brake valve body 20 for switching the internal passage of the exhaust pipe 9 from an open state to a closed state.

That is, the exhaust brake valve body 20 is built in the pressure chamber 22 which forms a predetermined closed closed space inside the exhaust pipe 9 and is movable in the airtight state in the pressure chamber 22. And a valve plate 26 coupled to one end of the piston 24 to close the exhaust pipe 9.

Here, the exhaust brake valve body 20 is configured to allow the exhaust pipe 9 to pass therethrough when the back pressure of the exhaust gas emitted from the exhaust pipe 9 is greater than or equal to an appropriate value.

In addition, the pressure chamber 22 is directly connected to the magnetic valve 5 and the air supply line 8 by the medium, so that the high pressure stored in the air storage tank 6 in accordance with the opening and closing of the magnetic valve 5. Compressed air can be supplied.

In addition, the piston 24 is applied to the pressure by the compressed air supplied into the pressure chamber 22 to move in the pressure chamber 22, the piston 24 via the connecting rod 24a The valve plate 26 coupled integrally closes the internal passage of the exhaust pipe 9 in conjunction with the movement of the piston 24.

On the other hand, the piston 24 is elastically supported through the return spring 28 accommodated in the pressure chamber 22, the return spring 28 is the supply of compressed air in the pressure chamber 22 is released In this case, the piston 24 is restored, thereby contributing to switching the exhaust pipe 9 which has been closed by the valve plate 26 to the open state.

In addition, the valve plate 26 has a plurality of through holes 26a formed on the outer circumference thereof, and the through holes 26a are closed by the valve plate 26 to allow the inner passage of the exhaust pipe 9 to close. In this case, when the back pressure rises above the prescribed value, the exhaust gas can be discharged to the outside, so that the back pressure of the exhaust pipe 9 can be always maintained to a certain degree.

To this end, the exhaust brake valve body 20 is divided into both sides on the exhaust pipe 9 and each of the first body portion 30 and the second body portion 32 of the hollow shape that is airtightly bonded and coupled to each other. The first body part 30 includes a cylinder 34 for forming the pressure chamber 22, a supply line 36 connected to the cylinder 34 for supply of compressed air, and the cylinder. First supporting members 38 for supporting 30 in the first body portion 30 are provided, respectively.

Here, the supply line 36 is directly connected to the air supply line 8, the high pressure compressed air introduced through the air supply line 8 in accordance with the opening of the magnetic valve (5) in the pressure chamber Direct flow into the interior of the cylinder (34) forming the (22).

In addition, the first support member 38 is radially disposed between the outer circumferential surface of the cylinder 34 and the inner circumferential surface of the first body portion 30 so as to form a free space for allowing the flow of exhaust gas. have.

In addition, the second body portion 32 is coupled to one side of the cylinder 34, the shielding plate 40 for the formation of the pressure chamber 22, and the shielding plate 40 to the second body portion ( The second support member 42 which supports in 32 is provided, respectively.

Here, the cylinder 34 forming the pressure chamber 22 together with the shielding plate 40 has a through hole for insertion of the connecting rod 24a for installation of the valve plate 26 connected to the piston 24. Of course, not shown) is formed.

The second support member 42 is also disposed radially between the edge of the shielding plate 40 and the inner circumferential surface of the second body portion 32 in the same manner as the first support member 38. It is to form a free space to allow the flow of.

Therefore, in the exhaust brake device as described above, when the control device is installed in the exhaust pipe 9 and the valve in which the operation is performed is replaced by the exhaust brake valve body 20 which is a piston valve, the dimensions of the parts Unstable performance problems of the exhaust brake system due to the difference in back pressure due to the deviation do not occur.

That is, the performance of the exhaust brake device due to the release of the operation due to the sticking between the exhaust passage and the valve in the exhaust pipe 9 due to the thermal expansion by the high temperature exhaust gas and the fluctuation of the back pressure due to the deviation of the closing amount in the exhaust passage. Instability and the like can be solved.

As described above, according to the exhaust brake device of an automobile according to the present invention, the butterfly valve 9a for closing the exhaust passage of the exhaust pipe 9 according to the operation of the exhaust brake operating switch 2 causes it to operate. As the control device is replaced with the exhaust brake valve body 20, which is a piston valve provided inside the exhaust pipe 9, the malfunction of the operation release due to sticking between the exhaust passage and the valve by the hot exhaust gas, It is possible to prevent the fluctuation of the back pressure due to the variation of the closing amount in the exhaust passage and thereby to stabilize the performance of the exhaust brake device.

Claims (5)

Exhaust brake device for a vehicle having a magnetic valve (5) for communicating the air supply line (8) between the air storage tank (6) in which compressed air is stored and the exhaust pipe (9) according to the operation of the exhaust brake operation switch (2). To Inside the exhaust pipe 9, a pressure chamber 22 that forms a predetermined closed space, a piston 24 movably installed in the pressure chamber 22, and one end of the piston 24 are coupled to each other. And an exhaust brake valve body 20 having a valve plate 26 for closing the exhaust pipe 9 so that the pressure chamber 22 receives compressed air directly from the magnetic valve 5 and discharges the exhaust cylinder. An exhaust brake apparatus for a vehicle, characterized in that configured to switch the furnace from an open state to a closed state. The method of claim 1, The piston 24 is elastically supported in the pressure chamber 22 via the return spring 28 so as to restore the piston 24 when the supply of compressed air into the pressure chamber 22 is released. Exhaust brake device for a vehicle, characterized in that. The method of claim 1, The valve plate 26 is formed with a plurality of through holes 26a for the flow of the exhaust gas so that the back pressure of the exhaust gas in the exhaust pipe 9 can always be maintained to a certain degree through this. Exhaust brake device for automobiles. The method of claim 1, The exhaust brake valve body 20 is composed of a hollow body of the first body portion 30 and the second body portion 32 is divided into the two sides on the exhaust pipe (9) to be airtightly bonded to each other, The first body portion 30 has a cylinder 34 for forming the pressure chamber 22, a supply passage 36 connected to supply the compressed air to the cylinder 34, and the cylinder 30. The first support member 38 for supporting the inside of the first body portion 30 is provided, respectively, the second body portion 32 is coupled to one side of the cylinder 34 to form the pressure chamber 22 And a second supporting member (42) for supporting the shielding plate (40) and the shielding plate (40) in the second body portion (32), respectively. The method of claim 4, wherein The supply passage 36 is directly connected to the air supply passage 8, and the first support member 38 and the second support member 42 each have an outer circumferential surface of the cylinder 34 and the first body portion. It is arranged radially between the inner circumferential surface of the 30 and the edge portion of the shielding plate 40 and the inner circumferential surface of the second body portion 32, respectively, to form a free space allowing the flow of exhaust gas. Vehicle exhaust brake system.