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Egr valve device

A technology for exhausting gas and driving devices, which is used in exhaust gas recirculation, valve device, fluid pressure actuating device, etc. Good maintenance of sealing, good assembly, and uncomplicated structure

Inactive Publication Date: 2009-11-04
KOMATSU LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, if the valve body is enlarged, there is a problem that since the valve body is more easily affected by pressure fluctuations and fluid dynamic fluctuations of the exhaust gas, it becomes more and more difficult to maintain a small opening of the valve body, resulting in impossibility of precision. to control flow

Method used

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Examples

Experimental program
Comparison scheme
Effect test

no. 1 approach

[0059] figure 1 It is a perspective view showing the appearance of the EGR valve device 1 according to this embodiment, which shows a state in which the poppet valve 3 as a valve body is closed; figure 2 is a cross-sectional view of the EGR valve device 1, namely figure 1 The II-II line view. Starting from the second embodiment described later, the same reference numerals are assigned to the same components as those in the first embodiment described below, and descriptions thereof are omitted or simplified.

[0060] exist figure 1 Here, the EGR valve device 1 is a device constituting an EGR system mounted on a diesel engine with a variable turbocharger (not shown). More specifically, the EGR system is composed of an EGR pipe connecting the exhaust manifold and the intake pipe, an EGR cooler installed in the middle of the EGR pipe, and an EGR valve installed on the downstream side of the EGR cooler, that is, on the outlet side of the EGR pipe. device 1, and a controller fo...

no. 2 approach 〕

[0094] Figure 4 A second embodiment of the present invention is shown. This embodiment is very different from the first embodiment in terms of the shape of the servo piston 16 and the absence of a valve spring.

[0095] In the servo piston 16 of the present embodiment, the pressure port 29 is used as a boundary, and the side of the hydraulic chamber 20 is a large-diameter portion 48 , and the side of the poppet valve 3 is a small-diameter portion 49 . Therefore, in the cylinder chamber 15 , the portion where the large-diameter portion 48 slides and the portion where the small-diameter portion 49 slides have different inner diameters of the cylinder chamber 15 . In such a configuration, the large diameter portion 48 has a larger pressure receiving area for the pressure oil flowing into the pressure port 29 than the small diameter portion 49 .

[0096] Therefore, when the pressure oil in the hydraulic chamber 20 is discharged to return the servo piston 16 to the hydraulic cha...

no. 3 approach 〕

[0099] Figure 5 A third embodiment of the present invention is shown. A major feature of this embodiment is that a butterfly valve 51 is used as a valve body. The butterfly valve 51 is rotatably accommodated in an exhaust passage of a valve sleeve 52 provided in the middle of the EGR piping. The drive shaft 53 of the butterfly valve 51 protrudes to the outside of the valve housing 52 . An arm 54 extending in a direction perpendicular to the axis thereof is attached to an end of the drive shaft 53 , and the arm 54 rotates integrally with the butterfly valve 51 .

[0100] A connecting pin 55 is provided at one end of the arm 54, and a mounting portion of the arm 54 and the drive shaft 53 is sandwiched between the one end and the other end, and one end of a link 56 is rotatably connected to the connecting pin 55. side. The other end of the connecting rod 56 is rotatably connected to a connecting pin 57 provided on the seal member 35 on the servo piston 16 side. Also, one en...

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Abstract

The present invention provides an EGR valve device (1) that includes a valve housing (2) of which inside exhaust gas passes through, a poppet valve (3) as a valve body accommodated in the valve housing (2), and a hydraulic servo actuator (4) for driving the poppet valve (3) to be opened and closed. The hydraulic servo actuator (4) is provided by a three-port ( Figure 2 ) or four-port servo valve.

Description

technical field [0001] The present invention relates to an EGR (Exhaust Gas Recirculation, exhaust gas recirculation) valve device, in particular to the improvement of an actuator for actuating the EGR valve. Background technique [0002] Currently, EGR is known as a measure for reducing nitrogen oxides (NOx) contained in exhaust gas from a diesel engine. In EGR, a part of the exhaust gas generated by the engine returns from the exhaust pipe to the intake pipe through the EGR pipe. At this time, an EGR valve device is provided on the EGR pipe or at a branch portion between the exhaust pipe and the EGR pipe. An appropriate amount of exhaust gas is returned to the intake pipe at an appropriate timing by controlling the opening and closing of the valve body constituting the EGR valve device according to the operating state of the engine. [0003] The valve body of such an EGR valve device is biased toward the closing side by a valve spring, and its base end side is connected ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F02M25/07F15B9/08F15B13/043F16K31/122
CPCF16K31/124F02M25/0779F16K11/0716F02M25/0789F16K31/42Y02T10/121F02M25/0793F02M2025/0759F16K31/1635F02M2026/002F02M26/59F02M26/67F02M26/70F16K31/20F16K31/30
Inventor 盛山英行饭岛正堀秀司小塚大辅大久保泰生
Owner KOMATSU LTD
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