Corrosion-resistant lightweight exhaust gas recirculation valve

Abstract

The application discloses a kind of corrosion-resistant light weight exhaust gas recirculation valves, including valve body, outer cover, in the valve body is equipped with valve stem drive mechanism, valve stem, the valve stem is composed of upper valve stem and lower valve stem, valve piece is equipped between the upper valve stem and lower valve stem, in the lower part of the valve body, and in the inner surface of the gas passage of valve body is equipped with plastic bushing, the valve piece is inside the plastic bushing to realize opening or closure, the lower end of the upper valve stem and the upper end of lower valve stem are all through plastic bushing.The application can enhance the corrosion resistance of valve body, reliability, optimize the gas flow stability of gas passage, thereby relatively reduce the overall weight of exhaust gas recirculation valve to realize light weight requirement, continuously strengthen sealing performance by multilevel sealing element setting, increase the smoothness of valve stem operation, reduce the probability of valve stem jam.

Description

Technical Field

[0001] This invention relates to pumps and valves, and more specifically to an exhaust gas recirculation valve for use in automobiles. Background Technology

[0002] An exhaust gas recirculation (EGR) valve is an electromechanical integrated product used to guide exhaust gas back into the intake manifold for re-combustion and to regulate the recirculation flow. After gasoline burns in the engine, a portion of the exhaust gas can be re-entered into the intake manifold through the EGR valve to participate in combustion again. This process allows for more complete fuel combustion, reducing energy consumption; it also lowers the temperature of the engine combustion chamber, thus inhibiting NO₂ production. x The compound produces a compound that reduces heat loss and decreases engine load.

[0003] Currently, exhaust gas recirculation (EGR) valves used in automobiles (especially hybrid vehicles) have metal valve bodies. The lower part of the valve body and the inner surface of the gas passage are also made of metal, making them susceptible to corrosion from vehicle exhaust gases. The valve stem is a single, integrated design, with the valve plate screwed onto it, which to some extent affects the stability and smoothness of exhaust gas flow. Furthermore, the valves are relatively heavy and assembly is complex. Additionally, the seal between the valve stem and the valve body is not tight enough and requires further improvement. All of these factors affect the proper functioning of the valve. Summary of the Invention

[0004] The purpose of this invention is to overcome the above-mentioned shortcomings and provide a corrosion-resistant and lightweight exhaust gas recirculation valve with a lighter overall weight, corrosion-resistant valve body, and convenient assembly.

[0005] The objective of this invention is achieved through the following technical solution: a corrosion-resistant and lightweight exhaust gas recirculation valve, comprising a valve body and an outer cover, wherein a valve stem drive mechanism and a valve stem are installed in the valve body, the valve stem being composed of an upper valve stem and a lower valve stem, a valve plate being installed between the upper valve stem and the lower valve stem, and a plastic bushing being installed in the lower part of the valve body and on the inner surface of the gas passage of the valve body, the valve plate being located inside the plastic bushing to achieve opening or closing, and the lower end of the upper valve stem and the upper end of the lower valve stem both passing through the plastic bushing.

[0006] The valve stem drive mechanism includes, in sequence, a motor, a motor gear, a transmission gear, and a sector gear. The sector gear has a downward-extending structure and a return spring is mounted on its periphery. The sector gear is connected to the upper valve stem, eliminating the original intermediate connecting component. Both the upper and lower valve stems have grooves, and the two ends of the valve plate are pressed into these grooves (interference fit, no fasteners required for fixation).

[0007] A pressure sleeve and a retaining ring are installed vertically on the upper valve stem, between the valve body and the upper valve stem at the sector gear position. An upper bearing and an upper Glyd ring are installed vertically on the upper valve stem, between the valve body and the upper valve stem below the sector gear. A lower Glyd ring and a lower bearing are installed vertically on the lower valve stem, between the valve body and the lower valve stem, to enhance the sealing performance between the upper and lower valve stems and the valve body. A flange sealing ring is installed between the outer surface of the vent port of the plastic bushing and the valve body to enhance the sealing performance between the plastic bushing and the valve body.

[0008] By adopting the structure of this invention, a plastic bushing is installed on the inner surface of the gas passage of the valve body, replacing part of the thickness of the gas passage, enhancing its corrosion resistance, and increasing product reliability. The valve stem is split into an upper valve stem and a lower valve stem, which are respectively connected to the valve plate, eliminating the need for original fastener assembly and optimizing the gas flow stability of the gas passage. This relatively reduces the overall weight of the exhaust gas recirculation valve, achieving the lightweight requirement. The multi-layered sealing components continuously enhance sealing performance, increasing the smoothness of valve stem operation and reducing the probability of valve stem jamming. Thus, the operation of the exhaust gas recirculation valve is guaranteed. Attached Figure Description

[0009] The present invention will now be described in further detail with reference to the accompanying drawings and embodiments.

[0010] Figure 1 This is a schematic diagram of the corrosion-resistant and lightweight exhaust gas recirculation valve of the present invention.

[0011] Figure 2 for Figure 1 Partial sectional view.

[0012] Figure 3 for Figure 1 A schematic diagram of the structure of the plastic bushing. Detailed Implementation

[0013] Reference Figures 1 to 3 As can be seen, the present invention relates to a corrosion-resistant and lightweight exhaust gas recirculation valve for hybrid vehicle engines (or engines of traditional fuel vehicles and construction machinery), comprising a valve body 1 and an outer cover 2. A valve stem drive mechanism and a valve stem are installed within the valve body 1. The valve stem consists of an upper valve stem 8 (located in the upper position) and a lower valve stem 15 (located in the lower position). A valve disc 10 (also known as a disc) is installed between the upper valve stem 8 and the lower valve stem 15. A plastic bushing 11 (used as a gas passage, assembled by a press-fit process, such as...) is installed in the lower part of the valve body 1 and on the inner surface of the gas passage of the valve body. Figure 2 , Figure 3 As shown), the valve plate 10 is located inside the plastic bushing to open or close (allowing gas to pass through or preventing gas from entering), and the lower end of the upper valve stem 8 and the upper end of the lower valve stem 15 both pass through the plastic bushing 11.

[0014] The valve stem drive mechanism 3 includes, in sequence, a motor 35, a motor gear 31, a transmission gear 32 (and a gear shaft 33), and a sector gear 34. The sector gear 34 has a downward extending structure and a return spring 4 is mounted on its periphery. The sector gear 34 (its axis) is connected to the upper valve stem 8 (omitting the original intermediate connecting part). The upper valve stem 8 (its lower end) and the lower valve stem 15 (its upper end) both have grooves 12. The two ends (upper and lower ends) of the valve plate 10 are pressed into the grooves 12 (they are fixed by interference fit and do not require fasteners), which reduces the installation and processing difficulty of multiple components.

[0015] A pressure sleeve 5 (upper position) and a retaining ring 6 (lower position) are installed on the upper valve stem 8, between the valve body and the upper valve stem at the sector gear position. An upper bearing 7 (upper position) and an upper glide ring 9 (lower position) are installed on the upper valve stem 8, between the valve body and the upper valve stem below the sector gear. A lower glide ring 13 (upper position) and a lower bearing 16 (lower position, and the lowest plug 17) are installed on the lower valve stem 15, between the valve body and the lower valve stem, to enhance the sealing performance between the upper and lower valve stems and the valve body. This multi-layered sealing effectively prevents exhaust gas from entering the valve stem drive mechanism. A flange sealing ring 14 is installed between the outer surface of the exhaust port of the plastic bushing 11 and the valve body 1 to enhance the sealing performance between the outer surface of the plastic bushing and the valve body. The outer surface of the plastic bushing 11 has an annular protrusion 21, and the upper glyph 9 and lower glyph 13 are both located at the annular protrusion to enhance the press-fit connection and sealing between the plastic bushing and the gas passage of the valve body.

[0016] A Hall sensor 19 (and a connected circuit board) is installed inside the outer cover 2. A magnet 18 corresponding to the position of the Hall sensor is installed on the sector gear 34 and near the top of the upper valve stem 8 (which senses each other with the Hall sensor) to accurately sense the rotation speed of the sector gear and the upper valve stem, and precisely control the opening degree of the valve plate (fully open, partially open or closed).

[0017] As shown in the attached diagram, the valve stem drive mechanism 3 of the present invention operates (the motor 35 starts and sequentially drives the motor gear 31, transmission gear 32, and sector gear 34 to rotate), thereby driving the upper valve stem 8 and the lower valve stem 15 to rotate. This causes the valve plate 10 to also rotate and remain in an open or closed state within the plastic bushing. This allows exhaust gas to enter from the air inlet (right end) of the plastic bushing 11, exit from the exhaust port (left end), or prevent exhaust gas from entering. The multi-layer sealing design effectively prevents exhaust gas (as well as oil, corrosive substances, particulate matter, etc.) from entering between the upper and lower valve stems and the upper and lower parts of the valve body (preventing corrosion of the valve body and valve stem, which could cause valve stem jamming) and the interior of the valve stem drive mechanism 3. It also increases the smoothness of valve stem operation and reduces the probability of valve stem jamming.

Claims

1. A corrosion-resistant and lightweight exhaust gas recirculation valve, comprising a valve body and an outer cover, wherein a valve stem drive mechanism and a valve stem are installed within the valve body, characterized in that: The valve stem consists of an upper valve stem and a lower valve stem. A valve plate is installed between the upper valve stem and the lower valve stem. A plastic bushing is installed in the lower part of the valve body and on the inner surface of the gas passage of the valve body. The valve plate is located inside the plastic bushing to open or close. The lower end of the upper valve stem and the upper end of the lower valve stem both pass through the plastic bushing.

2. The corrosion-resistant and lightweight exhaust gas recirculation valve as described in claim 1, characterized in that: The valve stem drive mechanism includes, in sequence, a motor, a motor gear, a transmission gear, and a sector gear. The sector gear has a downward extending structure and a return spring is installed around its periphery. The sector gear is connected to the upper valve stem.

3. The corrosion-resistant and lightweight exhaust gas recirculation valve as described in claim 1 or 2, characterized in that: Both the upper and lower valve stems have grooves, and the two ends of the valve plate are pressed into these grooves.

4. The corrosion-resistant and lightweight exhaust gas recirculation valve as described in claim 1 or 2, characterized in that: A pressure sleeve and a retaining ring are installed on the upper valve stem between the valve body and the upper valve stem at the position of the sector gear. An upper bearing and an upper glyph are installed on the upper valve stem between the valve body and the upper valve stem below the sector gear. A lower glyph and a lower bearing are installed on the lower valve stem between the valve body and the lower valve stem.

5. The corrosion-resistant and lightweight exhaust gas recirculation valve as described in claim 4, characterized in that: A flange sealing ring is installed between the outer surface of the exhaust port of the plastic bushing and the valve body.

6. The corrosion-resistant and lightweight exhaust gas recirculation valve as described in claim 2, characterized in that: A Hall sensor is installed inside the outer cover, and a magnet corresponding to the position of the Hall sensor is installed on the sector gear and near the top of the upper valve stem.

7. The corrosion-resistant and lightweight exhaust gas recirculation valve as described in claim 4, characterized in that: The outer surface of the plastic bushing has an annular protrusion, and the upper and lower glyphs are both located at the position of the annular protrusion.

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