JP3204586B2 - Exhaust control valve device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a control valve device for an exhaust system.

[0002]

2. Description of the Related Art As a conventional control valve device of this type, for example, one having a structure as shown in FIGS. 4 and 5 described in Japanese Utility Model Laid-Open No. 4-14719 is known.

[0003] The spindle projecting side of this device is a cylindrical bush provided as a sliding bearing in the through hole of the exhaust pipe.
It is supported by inserting it through the ash .

In the structure shown in FIG. 1 described in Japanese Patent Application Laid-Open No. 3-79884, a flow path wall in which a shaft is inserted is directly used as a bearing.

[0005]

However, in such a conventional device, the sliding bearing itself has a gas sealing function. However, if the clearance between the shaft and the bearing is only the gas sealing function, the clearance between the shaft and the bearing is limited. However, there is a problem that a sufficient gas sealing property cannot be obtained because it is determined that good slidability can be obtained.

Further, in such a structure, there is no problem in using as a control valve device provided at an outlet portion (muffler or the like) of an exhaust system in which gas leakage is allowed, but as a control valve device of an exhaust purification system. If used in the middle of the exhaust system, it becomes a big problem. The present invention has been made in order to solve the above-described problems, and an object of the present invention is to secure high gas sealing properties regardless of gas pressure while maintaining cost advantages. An object of the present invention is to provide a control valve device for an exhaust system that can be used.

[0007]

According to the present invention, there is provided a spindle having a butterfly valve mounted in an exhaust pipe and having one end protruding from the exhaust pipe; A bearing that is supported; one end of the spindle is inserted through the shaft center position so as to surround the bearing;
A cylindrical case whose end on the bearing side is hermetically mounted around the exhaust pipe or the bearing; one end of the spindle
Is fixed at the center inserted condition within the cylindrical casing, wherein the forming a curved portion having a curvature center point bearing side and is pressed against the outer periphery of the curved portion on an inner surface of said cylindrical casing ring
And a thin metal material.

[0008]

According to the present invention, a bearing having gas leakage is surrounded by a cylindrical case. In this cylindrical case, a ring-shaped thin metal material having a curved portion having a center of curvature on the bearing side is formed. Since the outer peripheral edge of the curved portion is pressed into contact with the inner surface and inserted and fixed , the bearing side is cut off from the outside by the thin metal material.

Therefore, the exhaust gas leaked from the bearing into the cylindrical case is prevented from leaking out of the cylindrical case by the thin metal material, and the thin metal material is prevented by the exhaust gas leaked from the bearing. When the pressure is applied and the curved portion is pressed toward the enlarged side in proportion to the pressure of the exhaust gas, the contact pressure with the inner surface of the cylindrical case increases, so that the gas sealing property can be ensured regardless of the gas pressure.

When controlling the exhaust gas, the spindle is rotated. At the same time, the thin metal material fixed to the spindle is rotated in the cylindrical case. For this reason, the outer peripheral edge of the thin metal material always performs a sliding action while sliding on the inner surface of the cylindrical case, and as the frequency of use increases, the contact pressure between the thin metal material and the inner surface becomes more uniform. Therefore, the sealing performance will be further improved.

[0011]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below in detail with reference to the drawings.

FIG. 1 is a sectional view showing a control valve device for an exhaust system according to this embodiment, and FIG. 2 is an enlarged view of a main part of the same.

First, the configuration of the embodiment will be described.

In the drawing, reference numeral 1 denotes a spindle, which is radially inserted into an exhaust pipe 2 in a purification system of a vehicle, and a butterfly valve 3 is mounted on the inserted portion. One end thereof protrudes out of the exhaust pipe through a through hole 4 formed in the exhaust pipe 2 and is supported by a bush 5 as a bearing. The other end is supported by a bush 7 in a hermetically sealed housing 6 fixed outside the exhaust pipe, so that the opening of the butterfly valve 3 can be adjusted.
In the figure, C is a gap provided to allow the spindle 1 to rotate favorably.

A cylindrical case 8 is fixed to the outside of the exhaust pipe 2 on the projecting side of the spindle 1 so as to surround the bush 5 and insert the projecting side of the spindle 1 at the axial position. The cylindrical case 8 has a lower end edge 9 fixed to the exhaust pipe 2 in a state of being hermetically sealed, and an upper end provided with only an opening 10 having substantially the same size as the spindle outer diameter.

The bush 5 may be positioned and fixed by the cylindrical case 8, or may be fixed by providing a separate housing.

The spindle 1 is placed in the cylindrical case 8.
Is provided with a thin metal material 11 having a central portion inserted therethrough.

The thin metal material 11 is formed in a ring shape, and when inserted into the cylindrical case 8, the metal thin material 11 has a larger diameter than the inner diameter of the cylindrical case 8 so as to form a curved portion 12 of an appropriate size on the outer periphery. It is formed with a large diameter.

When the exhaust gas temperature is approximately 400 ° C. or more, the material of the thin metal material 11 is a 20Cr-5Al alloy plate having a thickness of 30 to 50 μm and an exhaust gas temperature of approximately 40 ° C.
When the temperature is 0 ° C. or less, a stainless steel plate having a thickness of 30 to 50 μm is selected as a SUS631-CSP-H spring plate. However, the present invention is not limited to this. Plates can also be used.

The ring-shaped thin metal material 11
Are inserted into one end of the spindle 1, and washers 13 are arranged on both sides of the spindle 1, and are fixedly fastened together by nuts 14. The outer peripheral edge 12a of the thin metal material 11 is inserted into the cylindrical case 8 in a curved state toward the bush 5, thereby forming a curved portion 12 having a curvature center point O on the bush 5, The outer peripheral edge 12a of the curved portion 12 contacts the entire inner surface 8a of the case to form a gas seal portion 12b.

In the figure, reference numeral 15 denotes a spring receiver mounted on one end of the spindle 1 and has a lower end (a cylindrical case 8).
A plate 16 is disposed on the upper side and a traction plate 17 is disposed on the upper end, and is fixed by tightening a nut 19 on a male screw 18 provided at one end of the spindle. Reference numeral 20 denotes a collar for preventing deformation of the traction plate 17 due to excessive tightening of the nut 19.

Reference numeral 21 denotes a coil spring for urging the spindle 1 in the closing direction of the butterfly valve 3; 22, a bracket for fixing the other end of the coil spring 21 to the exhaust pipe 2; Lever 24
, And one end of the wire is connected to a control actuator (not shown).

Next, the operation of the embodiment will be described.

The exhaust gas G leaks out of the exhaust pipe 2 from the gap C due to the pressure, but is entirely collected in the cylindrical case 8 surrounding the bush 5. In this cylindrical case 8, the thin metal material 11 is sealed by the gas seal portion 12b and shuts off the flow path to the opening 10 side.
The gas seal portion 12b prevents the gas from flowing further, and prevents gas leakage from the opening 10.

The pressure of the exhaust gas G is set to
Also acts on the gas seal portion 12b, but the bending portion 12 tends to expand against this pressure.
Since the contact force of 2b increases in proportion to the exhaust gas pressure,
The sealing property of the gas seal portion 12b is maintained for an arbitrary pressure of the exhaust gas G.

During the control of the exhaust gas, the metal thin material 11 is also rotated by the rotation of the spindle 1, so that the outer peripheral edge 12 a of this metal thin material 11 and the inner surface 8 of the case 8
Grinding or abrasion is performed at the contact position with a, and the seal contact force becomes uniform in the circumferential direction.

As described above, in the exhaust valve control apparatus according to the present embodiment, the bush 5 from which gas leaks is surrounded by the cylindrical case 8, and the metal thin material 11 is used to surround the bush 5 in the cylindrical case 8. Gas seal part 12b around 1
Is provided, sufficient gas sealing properties can be obtained, and gas leakage can be prevented.

Since the thin metal material 11 has the curvature center point O on the bush 5 side, it has a curved portion 12 which is bent toward the bush 5 and comes into contact with the cylindrical case 8, so that the metal thin material 11 does not depend on the gas pressure. High gas sealability can be secured. Further, the sealing effect can be maintained regardless of the thermal expansion of each part.

During the control of the exhaust gas, the rotation of the spindle 1 causes the gas sealing portion 12b to perform a sliding action, and the sealing contact force becomes uniform in the circumferential direction, so that the sealing performance is improved.

Since the number of parts is small and the structure is simple, the number of assembling steps and costs can be reduced.

The embodiments of the present invention have been described above.
The specific configuration of the present invention is not limited to this embodiment, and the present invention includes any design change or the like without departing from the scope of the invention.

For example, as shown in FIG.
1 is placed in contact with the upper bottom surface 26 of the cylindrical case 25, and the washer 13 is provided only on the bush 5 side of the spindle 27.
And the nut 14 may be provided to press the thin metal material 11 on the upper bottom surface 26. In this case, the cylindrical case 25
Can be shortened and the number of parts can be reduced, which is more advantageous in terms of cost.

Further, as shown in FIG. 4, the only washer 13 is provided without the use of nuts on the type of placing a metal thin material 11 in a state in which on contact with the bottom surface 26 of the cylindrical case 25, the washer 13 and the bushing 5 by compressing and interposing a spring 28 therebetween.
May be pressed against the upper bottom surface 26 of the cylindrical case 25 by the urging force of the spring 28. In this case, the degree of adhesion between the thin metal material 11 and the upper bottom surface 26 is improved, and the followability to thermal expansion is also improved.

The device for preventing gas leakage formed by the cylindrical case 8 and the thin metal material 11 is not limited to the shape of the actuator connecting portion shown in the embodiment, and the device to which the collar 20 is not attached. And spring receiver 1
The present invention is also applicable to a device in which the coil spring 21 is directly mounted on the spindle 1 without providing the coil spring 3, a device in which a mesh for preventing interference noise is wound between the spindle 1 and the coil spring 21, and the like.

[0035]

As described above, in the control valve device of the exhaust system according to the present invention, a spindle having a butterfly valve mounted in the exhaust pipe and having one end protruding from the exhaust pipe; A cylindrical case having a projecting side pivotally supported; a cylindrical case surrounding the bearing and having one end of a spindle inserted into an axial position, and a bearing-side end being hermetically mounted around an exhaust pipe or a bearing; It is fixed in the cylindrical case at one end side of the spindle in a state of being inserted through the center.
Is the form a curved portion having a curvature center point bearing side and is pressed against the outer periphery of the curved portion on an inner surface of said cylindrical casing
And a ring-shaped thin metal material; therefore, a sufficient gas sealing property for preventing gas leakage can be obtained.

A high gas sealing property can be secured irrespective of the gas pressure, and the sealing effect can be maintained regardless of the thermal expansion of each part.

Since the sealing contact force becomes uniform in the circumferential direction in a controlled manner, the sealing performance is improved.

Since the number of parts is small and the structure is simple, effects such as reduction in the number of assembling steps and cost can be obtained.

[Brief description of the drawings]

FIG. 1 is a sectional view showing a control valve device of an exhaust system according to an embodiment of the present invention.

FIG. 2 is an enlarged view of a main part of the embodiment.

FIG. 3 is an explanatory view showing a main part of an exhaust system control valve device according to another embodiment.

FIG. 4 is an explanatory diagram showing a main part of an exhaust system control valve device according to another embodiment.

[Explanation of symbols]

 1, 27 Spindle 2 Exhaust pipe 3 Butterfly valve 5 Bush (bearing) 8, 25 Cylindrical case 8a Inner surface of cylindrical case 11 Metal thin material 12 Curved portion 12a Outer edge of curved portion O Curvature center point of curved portion

──────────────────────────────────────────────────続 き Continued on the front page (58) Field surveyed (Int.Cl. ⁷ , DB name) F02D 9 / 06,9 / 10 F01N 7/08 F16K 1/226

Claims (1)

(57) [Claims] A spindle having a butterfly valve mounted in the exhaust pipe and having one end protruding from the exhaust pipe; a bearing rotatably supporting a protruding side of the spindle; one end of the spindle surrounding the bearing; A cylindrical case, which is inserted into the cylindrical position, and whose end on the bearing side is hermetically mounted around the exhaust pipe or the bearing; and a center inserted into the cylindrical case on one end side of the spindle.
Comprise; is fixed by passing state, the curved portion is formed with a center of curvature points to the bearing side, and the outer peripheral edge of the curved portion and the cylindrical casing metal thin material inner surface a ring-shaped, which is pressed against the Control valve device for an exhaust system.