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Exhaust throttle valve

Inactive Publication Date: 2009-02-12
AISAN IND CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Such scratches are liable to cause malfunction of the valve element 64.

Method used

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  • Exhaust throttle valve
  • Exhaust throttle valve
  • Exhaust throttle valve

Examples

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embodiment 1

[0018]A detailed description of a first preferred embodiment of an exhaust throttle valve embodying the present invention will now be given referring to the accompanying drawings. In this embodiment, the exhaust throttle valve of the invention is embodied as an exhaust pressure control valve for a diesel engine.

[0019]FIG. 1 is a schematic configuration view showing a configuration of an exhaust system of a diesel engine (hereinafter, simply referred to as an “engine”) 1. The exhaust system of the engine 1 includes a diesel particulate filter (DPF) unit 2, an exhaust pressure control valve 3, and a muffler 4. Further, an electronic control unit (ECU) 6 is provided to control a fuel pump 5 of the engine 1 and the exhaust pressure control valve 3. The DPF unit 2 contains a ceramic filter and oxidation catalyst for trapping particulates and graphite (plumbago or black lead) contained in exhaust gas. An upstream side of the DPF unit 2 is connected to an exhaust manifold 8 of the engine 1...

embodiment 2

[0032]A second embodiment of the exhaust throttle valve of the invention will be explained below referring to the accompanying drawings. In each embodiment explained below, similar parts or components to those in the first embodiment are given the same reference codes and their details are not explained repeatedly. The following explanation will be made with a focus on differences from the first embodiment.

[0033]FIG. 4 is a sectional view of a schematic configuration of main parts of the exhaust pressure control valve 13 in this embodiment. In this second embodiment, a bypass passage 41 is formed in the casing 23. However, this embodiment differs from the first embodiment in that the opening 33a of the second shaft support part 33 is not matched with the bypass passage 41 and the opening 33a of the second shaft support part 33 is not positioned inside the bypass passage 41 but is placed outside the casing 23. In FIG. 4, the bypass passage 41 includes an inlet port 41a and an outlet ...

embodiment 3

[0035]A third embodiment of the exhaust throttle valve of the invention will be explained in detail with reference to the accompanying drawing.

[0036]FIG. 5 is a sectional view of a schematic configuration of main parts of an exhaust pressure control valve 14 in the third embodiment. This embodiment differs from the first and second embodiments in that the casing 23 is not provided with any bypass passages 22 and 41, and the opening 33a of the second shaft support part 33 is placed outside the casing 23.

[0037]In this embodiment, consequently, the inner pressure of the bore 21 upstream from the valve element 24 could not be controlled appropriately. Except for it, however, the third embodiment can provide the same operations and advantages as those in the first embodiment.

[0038]The present invention is not limited to the above embodiment(s) and may be embodied in other specific forms without departing from the essential characteristics thereof.

[0039]For instance, each of the above emb...

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PUM

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Abstract

An exhaust pressure control valve comprises a casing including a bore and a pair of first and second shaft support parts, and a valve shaft placed across the bore and rotatably supported by the shaft support parts. A first end portion of the valve shaft is arranged protruding outside the casing. A throttle valve is secured to the valve shaft inside the bore. An actuator is coupled to the first end portion to open and close the throttle valve. The second shaft support part is located in a bypass passage downstream from a bypass valve and has an opening in which a cap formed with a through hole is fitted. The inside of the second shaft support part is allowed to communicate with atmosphere through the through hole, the bypass passage, and others so that an end face of a second end portion can be subjected to atmospheric pressure.

Description

BACKGROUND OF THE INVENTION[0001]1. Field of the Invention[0002]The present invention relates to an exhaust throttle valve to be mounted in an exhaust system of an engine to restrict a flow of exhaust gas.[0003]2. Description of Related Art[0004]Heretofore, one technique of this type is disclosed in, for example, in JP2005-299457A. This '457A discloses an exhaust throttle valve mounted in an exhaust system of a diesel engine, downstream from a continuous regeneration DPF. As shown in FIG. 6, this exhaust throttle valve 61 is configured such that a butterfly valve element 64 is placed in a bore 63 of a casing 62. The casing 62 is formed, at both sides (at right and left sides in the figure), with a first shaft support part 66 and a second shaft support part 67 corresponding to both end portions of a valve shaft 65 respectively. Both end portions 65a and 65b of the valve shaft 65 are supported by the shaft support parts 66 and 67 through bearings 68. One end (the first end portion) 65...

Claims

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Application Information

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IPC IPC(8): F01N7/00F02D9/06F02D9/10F16K1/22
CPCF02D9/06
Inventor TAKEUCHI, MITSURUSARAI, NAOHITOSAKURAI, KOJIMATSUBARA, NAOKI
Owner AISAN IND CO LTD