JPH0710422U - Exhaust pipe control valve - Google Patents

Abstract

(57) [Abstract] [Purpose] To prevent malfunction of an exhaust pipe control valve due to adhesion of impurities, and to prevent exhaust gas from leaking to the outside. [Structure] A portion of the rotary shaft 1 exposed from the bearing 7 to the outside, an opening portion of the bearing 7 through which the rotary shaft 1 penetrates, and a slide arm 3 for transmitting a driving force to the rotary shaft 1. Is covered with a tube 4 which has flexibility and allows the displacement of the slide arm 3, and the closed space S is provided in this portion.
Was formed.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to an exhaust pipe control valve that is attached to an exhaust pipe and that can adjust a flow passage cross-sectional area of the exhaust pipe.

[0002]

[Prior art]

 In recent years, for example, as described in Japanese Utility Model Laid-Open No. 4-75124, in an exhaust pipe of an automobile, for switching a flow path of exhaust gas in the exhaust pipe, or for controlling a flow rate of exhaust gas. In addition, a control valve that can adjust the flow passage cross-sectional area may be attached to the exhaust pipe.

Conventionally, as such an exhaust pipe control valve, for example, the one described in Japanese Utility Model Laid-Open No. 2-73220 is known. FIG. 5 shows a control valve of the above-mentioned conventional publication. A butterfly valve 102 is housed in an exhaust pipe 101, and a rotary shaft 103 penetrating the exhaust pipe 101 in a direction orthogonal to the axis is connected to the butterfly valve 102. Has been done. The rotating shaft 103 is rotatably supported with respect to the exhaust pipe 101 by two bearings 104 and 105 fixed to the outside of the exhaust pipe 101. Then, a traction plate 106 and a spring receiver 107 are fixed to a portion of the rotating shaft 103 located outside the exhaust pipe 101 with a predetermined interval. Further, a rotary lever 108 is fixed to the pulling plate 106, and a wire 109 from an actuator (not shown) is connected to the rotary lever 108. Further, a coil spring 110 is interposed between the tow plate 106 and the spring receiver 107 so as to wind around the rotary shaft 103. The left end of the coil spring 10 is fixed to the traction plate 106, and the right end thereof is fixed to a bracket (not shown) fixed to the exhaust pipe 101. Further, inside the coil spring 110 arranged between the draft plate 106 and the spring receiver 107, a guide member 111 for guiding the coil spring 110 is arranged.

In such a structure of the exhaust pipe control valve, the butterfly valve 102 is rotated by rotating the towing plate 106 by the actuator, and the flow passage cross-sectional area of the exhaust pipe 101 is changed.

[0005]

[Problems to be solved by the device]

 However, in the above-described conventional exhaust pipe control valve, the drive system of the valve, such as the rotary shaft 103, the traction plate 106, the spring receiver 107, and the coil spring 110, is exposed to the outside. If impurities such as mud adhere to the portion, there is a problem that malfunction may occur. Furthermore, the exhaust gas in the exhaust pipe 101 goes out along the rotating shaft 103 to the bearing 105, the spring. There is a problem that the gas leaks out of the exhaust pipe 101 through a gap such as the receiver 107. Such a problem becomes a particularly serious problem when the control valve is provided at a position before reaching the catalyst as described in the former publication.

The present invention has been made by paying attention to the above-mentioned conventional problems. In the exhaust pipe control valve, malfunction is prevented from being caused by adhesion of impurities, and exhaust gas is exhausted. The problem is to prevent the leakage of water.

[0007]

[Means for Solving the Problems]

 In order to solve the above problems, the exhaust pipe control valve of the present invention is a means for forming a closed space for covering the input transmission member, the exposed portion of the rotary shaft, and the penetrating portion of the rotary shaft of the exhaust pipe by a flexible member. And

That is, a rotary shaft that spans the inside of the exhaust pipe in a radial direction and is rotatably supported, and has at least one end that penetrates the exhaust pipe and is exposed to the outside of the exhaust pipe, and a rotary shaft of this rotary shaft. A valve fixed to a portion of the rotary shaft located inside the exhaust pipe and a portion of the rotary shaft exposed to the outside of the exhaust pipe so that the cross-sectional area of the exhaust gas flow passage can be changed in accordance with the rotation. An input transmission member which receives an input from the outside and displaces and transmits it to the rotary shaft as a rotary motion; the input transmission member; And a flexible member formed of a material having flexibility to allow displacement of the input transmission member, and a sealed member that covers a portion of the input pipe is provided outside the exhaust pipe. To do.

[0009]

[Action]

 When changing the cross-sectional area of the exhaust gas flow path of the exhaust pipe, if an operating force is input from the outside to the input transmitting member, the input transmitting member is displaced and the operating force is transmitted to the rotating shaft, which causes the rotating shaft to rotate. Move. As a result, the valve fixed to the rotating shaft rotates inside the exhaust pipe, changing the cross-sectional area of the flow path of the exhaust gas, adjusting the flow rate of the exhaust gas, or Switch the flow path. The flexible member that covers the input transmission members is deformed as the input transmission members are displaced.

Further, the flexible member forms a closed space by covering a portion of the rotating shaft that penetrates the exhaust pipe and is exposed to the outside, an input transmission member, and a portion of the exhaust pipe that penetrates the rotating shaft. Therefore, even if the exhaust gas of the exhaust pipe leaks out of the exhaust pipe along the rotation axis, it does not leak to the outside of this closed space, and there is no dirt on the input transmission member or the rotation axis. It does not adhere.

[0011]

【Example】

 Embodiments of the present invention will be described below with reference to the drawings.

First, the configuration will be described. FIG. 1 is a vertical cross-sectional view showing an exhaust pipe control valve according to an embodiment of the present invention. The embodiment valve includes a rotary shaft 1, a butterfly valve 2, a slide arm (input transmission member) 3, as shown in the drawing. It is composed of a tube (flexible member) 4.

The rotating shaft 1 is inserted through the exhaust pipe 5 in the radial direction and is rotatable by bushes 8 and 9 mounted on two bearings 6 and 7 fixed to both sides of the exhaust pipe 5. It is supported. The butterfly valve 2 is fixed to a portion of the rotary shaft 1 located inside the exhaust pipe 5, and is formed so that the exhaust gas passage cross-sectional area can be changed as the rotary shaft 1 rotates. There is.

The one bearing 6 has a bottomed cylindrical shape, and the peripheral edge is welded to the exhaust pipe 5 to seal one end of the rotating shaft 1, while the other bearing 7 has a cylindrical shape. It is formed, and the other end of the rotary shaft 1 is exposed to the outside of the exhaust pipe 5. The bearing 7 is welded to the exhaust pipe 5 so as to maintain an airtight state.

Further, washers 10 and 13 are mounted on the outside of the bearing 7, and a portion of the rotary shaft 1 exposed from the bearing 7 is engraved between the washers 10 and 13. A stopper ring 12 mounted in the key groove 11 is engaged. The washers 10 and 13 are fixed to the bearing 7 with screws 14. Further, the bearing 7 is welded to the exhaust pipe 5 so as to maintain an airtight state.

The slide arm 3 is engaged with a spline groove 15 formed at the end of the rotary shaft 1, and the rotary shaft 1 is slid in the axial direction by sliding the slide arm 3 in the axial direction. It is configured to rotate. An end plate 3a is fixed to the end of the slide arm 3.

The tube 4 is welded to the outer end portion of the bearing 7 and the end plate 3a so as to maintain an airtight state, whereby the exposure from the exhaust pipe 5 (bearing 7) of the rotary shaft 1 is performed. A closed space S is formed which covers the portion, the slide arm 3, and the open end of the bearing 7 which is the penetrating portion of the rotary shaft 1. That is, the tube 4 is formed to be expandable and contractable in the axial direction of the rotating shaft 1 so that the slide arm 3 can be displaced when the slide arm 3 is slid in the axial direction of the rotating shaft 1. It is made of a material (metal, etc.) that can withstand the high temperature of exhaust gas.

Next, the operation will be described. When changing the flow passage cross-sectional area of the exhaust gas in the exhaust pipe 5, the end plate 3a is appropriately pressed in the arrow X direction by an actuator (for example, a solenoid or an air cylinder), and the slide arm 16 is moved forward to rotate the rotary shaft. An external force is applied to the spline groove 15 of 1. As a result, the rotary shaft 1 rotates, the angle of the butterfly valve 2 changes, and the flow passage cross-sectional area of the exhaust gas in the exhaust pipe 5 changes. By the way, in the case of the present embodiment, the cross-sectional area of the flow path expands as an external force is applied to the end plate 3a in the X direction, and when the external force is removed, the restoring force of the tube 4 brings the tube into the fully closed state shown in the figure. Configured to return.

Exhaust gas flowing through the exhaust pipe 5 may leak from the bush 9 to the outside of the exhaust pipe 5 along the rotating shaft 1. The outside of the bush 9 is sealed by the tube 4. Since the closed space S is formed, the exhaust gas does not leak outside.

As described above, in the exhaust pipe control valve of the embodiment, the portion exposed from the bearing 7 fixed to the exhaust pipe 5 of the rotating shaft 1 to the outside and the opening portion of the bearing 7. And the slide arm 3 that transmits the driving force to the rotating shaft 1 is covered with a tube 4 that is flexible and that allows the displacement of the slide arm 3 to form the closed space S in this portion. The effect that the exhaust gas in the exhaust pipe 5 does not leak to the outside through the rotating shaft 1 and impurities such as mud adhere to the drive system such as the slide arm 3 and the spline groove 15. It is possible to prevent the occurrence of malfunction due to the adhesion of impurities.

Further, in forming the closed space S as described above, since only the tube 4 is provided, the structure is simple and the manufacturing is easy. Moreover, in this embodiment, as the means for rotating the rotating shaft 1, the slide arm 3 and the spline groove 15 are used to convert the slide in the axial direction into the rotation. The displacement amount is small and it is easy to cover with the tube 4 as described above.

Further, in the present embodiment, since the actuator that operates the slide arm 3 is provided outside the closed space S, it is difficult to be affected by the heat of the exhaust gas, and various actuators can be used.

Although the embodiments have been described above with reference to the drawings, the specific configuration is not limited to the embodiments, and modifications and additions within the scope of the present invention are included in the present invention. Be done.

In the embodiment, the slide arm 3 is shown as the input transmission member, but what kind of input transmission member may be used as long as the input transmission member receives an input from the outside and is displaced to transmit the rotation movement to the rotation shaft. Any of them may be used, and for example, an arm fixed to the rotating shaft may be used.

Further, if the rotary shaft 1 and the slide arm 3 in the closed space S of the embodiment are filled with a lubricant such as grease, dew condensation occurs on this part or the dew condensation freezes, which causes malfunction. Can be prevented, and since the closed space S is closed, the lubricant does not flow out.

[0026]

[Effect of device]

 As described above, in the exhaust pipe control valve of the present invention, the flexible member forms the closed space that covers the input transmission member, the exposed portion of the rotating shaft, and the penetrating portion of the rotating shaft of the exhaust pipe. Since the exhaust gas in the exhaust pipe travels along the rotating shaft and leaks to the outside, it does not leak to the outside of the sealed space covered by the flexible member. In addition, mud and the like do not adhere to the input transmission member and the rotating shaft, and it is possible to prevent the malfunction due to such adhesion of impurities.

[Brief description of drawings]

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

FIG. 2 is a vertical cross-sectional view showing a conventional exhaust pipe control valve.

[Explanation of symbols]

 1 Rotating Shaft 2 Butterfly Valve 3 Slide Arm (Input Transmission Member) 4 Tube (Flexible Member) 5 Exhaust Pipe S Sealed Space

Claims (1)

[Scope of utility model registration request] 1. A rotary shaft spanning in the exhaust pipe in a radial direction and rotatably supported, at least one end of which penetrates the exhaust pipe and is exposed to the outside of the exhaust pipe, and a rotating shaft of the rotary shaft. A valve fixed to a portion of the rotary shaft located inside the exhaust pipe, and a portion of the rotary shaft exposed to the outside of the exhaust pipe, the flow passage cross-sectional area of the exhaust gas being changeable in accordance with the movement. An input transmission member that receives an input from the outside and is displaced and transmitted to the rotary shaft as a rotary motion, and covers the input transmission member, the exhaust pipe outside exposed portion of the rotary shaft, and the rotary shaft penetrating portion of the exhaust pipe. And a flexible member formed outside the exhaust pipe to form a closed space, the flexible member being made of a flexible material that allows the displacement of the input transmission member. Exhaust pipe control valve.