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Exhaust gas recirculation valve

A technology of exhaust gas circulation and valve seat, which is applied in the field of valve and valve seat shape, can solve the problems of valve core switch influence, sealing part burden, leakage increase, etc., achieve low-cost manufacturing, improve bite resistance, and simplify valve seat shape Effect

Active Publication Date: 2012-05-23
MITSUBISHI ELECTRIC CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] In the existing exhaust gas recirculation valve, there is the following technical problem: when foreign matter such as sediment contained in the exhaust gas accumulates near the sealing surface between the valve and the valve seat, the valve and the valve seat are fixed due to the biting of the foreign matter, Thus affecting the switch of the spool
[0005] However, although a wide range of line sealing is ensured in this structure, in the closed state of the valve, the high pressure of the gas flowing in the exhaust gas passage acts on the shaft of the valve, thereby exerting a relatively high pressure on the sealing portion around the shaft. Large burden, without sealing, will increase the leakage at this part
In addition, since the valve seat is composed of two parts, there is a disadvantage that the structure is complicated.

Method used

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Experimental program
Comparison scheme
Effect test

Embodiment approach 1

[0022] figure 1 (a) is a plan view of the exhaust gas recirculation valve according to Embodiment 1 of the present invention, figure 1 (b) is along figure 1 (a) Cross-sectional view taken along line DD. figure 2 (a) is a plan view showing the shape of the valve 1, in figure 2 (b), figure 2 (c), figure 2 (d) shows a cross-sectional view cut along line A'A', line B'B', and line C'C'. image 3 (a) is along figure 1 (a) The cross-sectional perspective view of the open valve state cut by the DD line, image 3 (b) is a cross-sectional perspective view in a valve closed state.

[0023] The exhaust gas recirculation valve includes: a substantially circular valve 1 ; a valve seat 2 having a perfectly circular opening; a shaft 3 for rotating the valve 1 ; and a plate 4 provided between the valve 1 and the shaft 3 . A straight line passing through the center of the perfectly circular valve seat 2 is defined as a center line O1, and a rotation center axis of the shaft 3 when t...

Embodiment approach 2

[0032] Figure 4 shows the structure of the exhaust gas recirculation valve of Embodiment 2, Figure 4 (a) is a plan view, Figure 4 (b) is along Figure 4 (a) The sectional view cut by the EE line, Figure 4 (c) is along Figure 4(a) Cross-sectional view cut along the center line O1. The exhaust gas recirculation valve shown in Embodiment 1 above has a biaxial eccentric structure, but in Embodiment 2, the exhaust gas recirculation valve has a uniaxial eccentric structure. That is, the rotation axis O2 of the shaft 3 is uniaxially eccentric with respect to the center line O1 of the valve seat 2 from the center of the valve toward the long base side of the trapezoid. The valve 1 is bilaterally symmetrical with respect to the rotation axis O2 of the shaft 3 in the closed state, so there is no pressure difference between the left and right pressures of the exhaust gas received by the valve 1 in the closed state. Therefore, the valve opening force due to the pressure differe...

Embodiment approach 3

[0037] Figure 5 It is a plan view showing the structure of the exhaust gas recirculation valve of Embodiment 3.

[0038] In the exhaust gas recirculation valve of Embodiment 1 described above, in order to form a biaxial eccentric structure, the rotation axis O2 of the shaft 3 is shifted in the Y direction with respect to the center line O1 of the valve seat 2 . Therefore, the torque generated by the valve 1 on the left and right surfaces relative to the shaft O2 of the shaft 3 is slightly different. force. Therefore, in Embodiment 3, if Figure 5 As shown, in addition to the biaxial eccentric structure, it can also be configured as a balanced valve structure.

[0039] exist Figure 5 Among them, the structure is as follows: by reducing the area indicated by the oblique lines of the valve 1 and the valve seat 2 respectively, and making the torque generated on the left and right surfaces of the valve 1 centered on the rotation axis O2 of the shaft 3 be the same, it is possi...

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Abstract

Disclosed is an exhaust gas recirculation valve mounted so that an axis of rotation (O2) of a shaft (3) is biaxially eccentric in the X and Y directions to an axial center line (O1) of a valve seat (2). The outer circumferential surface of a valve (1) is bevelled to ensure linear contact between the valve (1) and the valve seat (2), and the outer circumferential surface of the valve changes from a positive to a negative angle of inclination at two locations offset from the axial center thereof. In addition, these two locations are joined by segments each having a constant angle of inclination, and other segments are joined smoothly.

Description

technical field [0001] The invention relates to the shape of the valve and the valve seat of an exhaust gas recirculation valve (ERG valve). Background technique [0002] In the exhaust gas recirculation valve, the spool that regulates the flow rate of the exhaust gas is composed of a valve that opens and closes the exhaust gas passage and a rotating shaft that activates the valve. The rotating shaft is rotatably supported by a bearing provided on the valve body casing. On the other hand, the valve seat is provided on the casing constituting the exhaust gas passage, and the exhaust gas passage is closed by rotating the valve integrally with the rotating shaft and abutting against the valve seat. [0003] In the existing exhaust gas recirculation valve, there is the following technical problem: when foreign matter such as sediment contained in the exhaust gas accumulates near the sealing surface between the valve and the valve seat, the valve and the valve seat are fixed due...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F02M25/07F16K1/22
CPCF16K1/222Y02T10/121F02M25/0793F02M26/70F16K1/22Y02T10/12
Inventor 栗原朗优头井拓朗长谷川晓
Owner MITSUBISHI ELECTRIC CORP
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