JPH0634143U - Exhaust brake butterfly valve device - Google Patents

Abstract

(57) [Abstract] [Purpose] To prevent the bearing member that supports the rotary shaft of the valve element from being exposed to high-temperature exhaust gas. [Structure] The bearing member 17 is mounted outside the seal member 16, and the inner peripheral surface of the bearing portion 11 inside the seal member 16 and the downstream side of the valve body 12 are communicated with each other through a communication passage 19. As a result, the exhaust gas flowing into the rotary shaft 13 side is blocked by the seal member 16 and does not reach the bearing member 17, and the inflowing exhaust gas is passed through the communication passage 19 to the valve body 12
Promptly discharge into the low pressure pipeline on the downstream side.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a butterfly valve that controls the braking force by opening and closing the exhaust path of an automobile engine, and in particular, a butterfly valve for an exhaust brake that prevents leakage of exhaust gas from the bearing of the rotating shaft of the butterfly valve. Regarding the device.

[0002]

[Prior art]

 Generally, a butterfly valve device has a valve body (2) in a valve holding body (1) having a cylindrical cross section, as shown in a vertical plan view of FIG. 5 and a vertical side view of FIG. Is rotatably supported by rotating shafts (3) and (4) that directly intersect with the shaft, and at least one of the rotating shafts (3) penetrates the wall surface of the valve holder (1) and projects to the outside, and engages with this. By operating the handle (5), the valve body (2) is configured to rotate to the valve open position shown by the solid line in FIG. 6 and the closed position shown by the two-dot chain line.

FIG. 4 is a cross-sectional view showing an exhaust brake butterfly valve device disclosed in Japanese Utility Model Laid-Open No. 62-43143, in which a bearing portion (102) formed on a side wall of a valve holder (101) is provided with a valve. A rotating shaft (104) fixed to the body (103) is rotatably supported.

Between the rotary shaft (104) and the inner peripheral surface of the bearing portion (102), a bearing metal (105) is loosely fitted on the inner side of the pipeline, and a seal member (106) is fitted on the outer side thereof. ) Is attached to prevent the exhaust gas flowing in from the pipeline from leaking to the outside.

Further, in the butterfly valve device of FIG. 4, from the inner surface of the bearing portion (102) where the seal member (106) is mounted, through the side wall of the valve holder (101) to the downstream side of the pipeline. A communication passage (107) is provided for communication.

In this butterfly valve device, when the pipe is closed by the valve body (103), exhaust gas upstream of the valve body (103) causes the bearing metal (105), the rotating shaft (104), and the bearing portion ( After flowing out through the gap with the pipe (102), it is returned to the downstream side of the pipe through the communication passage (107) to prevent the exhaust gas from leaking out of the pipe. is there.

[0007]

[Problems to be solved by the device]

 In the conventional butterfly valve device shown in FIG. 4, the bearing metal (105) supporting the rotary shaft (104) is arranged closer to the pipe line than the seal member (106), and the communication passage (107) Since the inlet end opens between the bearing metal (105) and the seal member (106), the exhaust gas passes through the bearing metal (105) and then through the communication passage (107) into the pipeline. It will be refluxed.

Therefore, when the valve body (103) closes the pipeline, the bearing metal (105) is heated by being exposed to high-temperature exhaust gas, so that the bearing metal (105) inside the rotating shaft (104) or the bearing portion (102) is heated. There is a risk that seizure will occur between the peripheral surface and the peripheral surface of the valve body (103), which may impair the rotational operation of the valve body (103).

An object of the present invention is to provide an exhaust brake butterfly valve that solves the above inconvenience.

[0010]

[Means for Solving the Problems]

 In order to achieve the above-mentioned object, the present invention opens a valve body in a pipe of exhaust gas having a bearing portion for supporting a rotating shaft on a side wall and opens the pipe by a rotating shaft orthogonal to the pipe. In a butterfly valve device for an exhaust brake, which is rotatably supported at an open position and a closed position for closing a pipeline, a seal member is provided at a portion of the rotary shaft that penetrates the bearing portion near the interior of the pipeline. A bearing member is attached to the outside of each of the seal members, and an inner peripheral surface of the bearing portion inside the area where the seal member is attached and a pipe line downstream of the valve body are provided at appropriate places of the bearing portion. It is characterized by the provision of a communication passage for communicating with each other.

[0011]

[Action]

 By mounting the bearing member outside the seal member and communicating the inner peripheral surface of the bearing portion inside the seal member with the downstream side of the valve body through a communication passage, the exhaust gas flowing in the rotational axis direction The exhaust gas is blocked by the seal member and does not reach the bearing member, and the exhaust gas that has flowed in is quickly discharged through the communication passage into the low-pressure pipeline downstream of the valve body.

[0012]

【Example】

 FIG. 1 is a vertical sectional view of a main part of a first embodiment of the present invention, and FIG. 2 is a vertical side view.

The rotating shaft (13) fixed to the valve body (12) is inserted into the bearing portion (11) formed in the valve holding body (10), and the rotating shaft (13) and the bearing portion (11) are Between the inner peripheral surface, the seal holding member (14) is installed in the pipe line, that is, in the region close to the valve body (12), and the bearing metal (17) is installed on the outside thereof in proximity to or in contact with each other. There is.

The seal holding member (14) is fitted on the rotary shaft so that a slight gap is formed between the inner end side of the seal holding member (14) and the inner peripheral surface of the bearing portion (11), A seal ring (16) is fitted on the step portion (15) formed on the side. The seal ring (16) is formed in an annular shape in which a part of the outer circumference of the elastic material is cut out, and is attached by elastically reducing the diameter so as to be in close contact with the inner peripheral surface of the bearing section (11).

The bearing metal (17) is loosely fitted between the outer peripheral surface of the rotary shaft (13) and the inner peripheral surface of the bearing portion (11) with a slight gap therebetween. A cover plate (18) is attached to the outer surface of the bearing portion (11) to prevent the bearing metal (17) and the seal holding member (14) from moving.

In the bearing portion (11), the inlet end (19a) is in the gap (C) between the seal holding member (14) and the bearing portion (11) inside the seal ring (16), Further, as shown in FIG. 2, the outlet end (19b) has a communication passage (opened downstream of the closing position of the valve body (12) with respect to the exhaust gas flow flowing in the direction of the arrow A in the pipe ( 19) has been formed.

In the butterfly valve device of the first embodiment, when the valve body (12) is set to the closed position shown by the two-dot chain line in FIG. 2 and the pipeline is closed, the rotary shaft (arrow A) moves from the upstream side (arrow A). The high-temperature and high-pressure exhaust gas flowing in the direction 13) flows into the gap (C) between the seal holding member (14) and the bearing portion (11).

At the outer end of the seal holding member (14), the seal ring (16) seals the space between the seal holding member (14) and the inner peripheral surface of the bearing portion (11). Without leaking to the outside of the seal ring (16), it flows through the communication passageway (19) and into the low-pressure pipeline downstream of the valve body (12).

Therefore, the bearing metal (17) is completely shielded from the flow of exhaust gas and is not exposed to high temperature exhaust gas to be heated, so that the rotating shaft (13) and the bearing portion (11) are It is possible to eliminate the inconvenience of sticking and obstructing the rotational movement of the valve body (12).

FIG. 3 is a vertical cross-sectional view of an essential part showing a second embodiment of the present invention, and members common to FIG. 1 are designated by the same reference numerals.

In the second embodiment, annular grooves (15a) and (15b) are provided on both sides in the axial direction of the seal holding member (14), and seal grooves (16a) and (16b) are provided in each of them. It is an external fitting.

The inlet end (19a) of the communication passageway (19) opens at an intermediate position between the two seal rings (16a) and (16b).

Exhaust gas that has entered the gap (C) of the bearing portion (11) from the pipeline is partly blocked by the inner seal ring (16a), and a relatively small amount of leaked gas that has passed through it is passed through. Is prevented from reaching the bearing metal (17) side by being blocked by the outer seal ring (16b), and quickly flows out to the downstream side of the pipeline through the communication passageway (19).

That is, the second embodiment is more excellent in the effect of shielding the bearing metal (17) from the exhaust gas than the first embodiment, and the downstream side from the communication passage (19) is improved. The amount of exhaust gas that leaks into the vehicle can be reduced, and the closing action of the butterfly valve can be enhanced.

[0025]

[Effect of device]

 According to the present invention, the following effects can be obtained. (a) The bearing metal that supports the rotary shaft of the valve body can be shielded from high-temperature exhaust gas to prevent seizure due to the temperature rise of the bearing metal, thus ensuring a smooth opening / closing operation of the valve body.

(B) When the valve body is closed, the exhaust gas that has passed through the sealing portion flows out to the downstream side in the pipeline through the communication passage, so that the exhaust gas does not completely leak out of the pipeline. Can be prevented.

[Brief description of drawings]

FIG. 1 is a vertical cross-sectional view of an essential part of a first embodiment of the present invention.

FIG. 2 is likewise a vertical side view.

FIG. 3 is a vertical cross-sectional view of an essential part of a second embodiment of the present invention.

FIG. 4 is a vertical sectional view showing an example of a conventional exhaust brake butterfly valve device.

FIG. 5 is a vertical plan view showing an exhaust brake butterfly valve to which the present invention is applied.

FIG. 6 is likewise a vertical sectional side view.

[Explanation of symbols]

(1) Valve holding body (2) Valve body (3) (4) Rotating shaft (5) Handle (10) Valve holding body (11) Bearing part (12) Valve body (13) Rotating shaft (14) Seal holding member (15) Step (15a) Groove (15b) Groove (16) Seal ring (seal member) (16a) (16b) Seal ring (17) Bearing metal (bearing member) (18) Cover plate (19) Communication passage ( 19a) Inlet end (19b) Outlet end

Claims (1)

[Scope of utility model registration request] 1. A valve body is provided in an exhaust gas pipeline having a bearing portion for supporting a rotary shaft formed on a side wall, and a valve opening position for opening the pipeline by a rotary shaft orthogonal to the pipeline and a pipeline. In a butterfly valve device for an exhaust brake, which is rotatably supported at a closed position for closing a valve, a seal member is provided at a portion near the inside of a pipe line of a rotating shaft passing through the bearing portion, and a bearing is provided outside the seal member. Each member is mounted, and a communication passage that connects the inner peripheral surface of the bearing portion inside the region where the seal member is mounted and the inside of the pipeline downstream of the valve body is provided at an appropriate position of the bearing portion. A butterfly valve device for exhaust brakes.