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Exhaust gas recirculation valve

A technology of exhaust gas recirculation and valve body, which is applied in the direction of exhaust gas recirculation, adding non-fuel substances to fuel, engine components, etc., and can solve problems such as wear and EGR gas leakage

Inactive Publication Date: 2015-05-13
DENSO CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the two stainless steels are not an excellent combination in terms of wear resistance, although the friction between stainless steels against each other limits their wear to worse than that between stainless steel and aluminum.
[0006] Therefore, in the previously given EGR valve 101 in which the seal ring 108 made of stainless steel and the orifice ring 109 made of stainless steel rub against each other, there is concern that the EGR gas may be worn out due to wear over a long period of time. area of ​​leakage

Method used

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  • Exhaust gas recirculation valve
  • Exhaust gas recirculation valve
  • Exhaust gas recirculation valve

Examples

Experimental program
Comparison scheme
Effect test

no. 1 example

[0019] will refer to Figures 1A to 2 A first specific embodiment is described. The EGR system is a well-known technology for mixing unburned EGR gas into a portion of intake air by returning a portion of exhaust gas discharged from an engine as EGR gas to the intake side of the engine. The EGR system includes: an EGR passage for returning a part of the exhaust gas flowing through the exhaust passage to the intake passage; an EGR valve 1 for adjusting the amount of gas in the EGR passage by adjusting the opening of the valve. The opening degree of the EGR valve 1 is controlled by the ECU according to the running state of the vehicle.

[0020] The EGR valve 1 may be a high-pressure EGR valve provided in a high-pressure EGR system that returns EGR gas to the downstream side of a throttle valve (throttle valve) in an intake passage along an intake flow direction. The EGR valve 1 may also be a low-pressure EGR valve provided in the low-pressure EGR system, which causes the EGR g...

no. 2 example

[0043] Next will refer to Figure 3A with 3B A second embodiment is described. In the following embodiments, the same reference numerals as those in the first embodiment denote functionally corresponding parts. In the second embodiment, the sliding surface 24 of the inner resin ring 5 is formed as a spherical surface (see in Figure 3A Alternate two-dot dash line α) in , where the sealing ring 8 is in sliding contact with the sliding surface, and the center of rotation of the butterfly valve 6 is the center point of the ball. This sliding surface 24 is formed by cutting and polishing work after the inner resin ring 5 is press-fitted to the inner peripheral surface of the outer metal ring 4 . The sliding surface 24 is finished to a smooth surface with high precision. The specific dimension (diameter dimension) of the inner diameter of the spherical surface is slightly smaller than the outer diameter dimension of the free length of the sealing ring 8 . The inner diameter of...

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PUM

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Abstract

An EGR valve includes an aluminum valve body, an outer metal ring, an inner resin ring, a butterfly valve, and a seal ring. The valve body includes a gas passage therein. The gas passage is part of an EGR passage, through which EGR gas is returned from an exhaust passage to intake passage of an engine. The outer ring has a cylindrical shape, and is fixed and disposed on an inner wall of the gas passage. The inner ring has a cylindrical shape, and is disposed on an inner peripheral wall of the outer ring. The butterfly valve opens or closes an inside of the inner ring, and includes a seal fitting groove at an outer peripheral edge of the butterfly valve. The seal ring is fitted into the groove, and seals a clearance between the butterfly valve and the inner ring when the butterfly valve is closed.

Description

technical field [0001] The present invention relates to an exhaust gas recirculation (EGR) valve that regulates the amount of EGR gas (a portion of the exhaust gas) that is returned to the intake side of an engine (an internal combustion engine that generates power due to the combustion of fuel). Background technique [0002] An engine provided in a vehicle includes an exhaust gas recirculation system (EGR system) for returning EGR gas to its intake side. The EGR system includes: EGR channel, which is used to introduce EGR gas from the exhaust channel of the engine to the intake channel; the EGR valve, through the adjustment of its opening, adjusts the amount of EGR gas returned to the EGR channel on the intake side; engine control A unit (ECU) that performs control of the opening degree of the EGR valve (specifically, controls energization of an electric actuator provided in the EGR valve). [0003] The main features of the traditional technology EGR valve will refer to F...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): F02M25/07
CPCF02M26/54F02M26/70
Inventor 佐野亮丹羽雄祐山中哲尔岛田广树
Owner DENSO CORP