Lightweight exhaust gas recirculation valve

Abstract

The utility model discloses a light-weight exhaust gas recirculation valve which comprises a valve body and an outer cover, a valve rod transmission mechanism is arranged on the valve body and between the valve body and the outer cover, a driven gear of the valve rod transmission mechanism is connected with a valve rod through a return spring, a steel sleeve is arranged in the valve body, the valve rod penetrates through the steel sleeve, a valve plate is arranged in the middle of the valve rod, and the valve plate is connected with the valve rod. The steel sleeve is provided with a waste gas channel and corresponds to the valve plate in position, and the valve body is made of plastic and is of an integrated injection molding structure with the steel sleeve. A limiting structure is arranged at the position, connected with the valve body, of the outer surface of the steel sleeve. The valve body is made of a high-temperature-resistant and high-strength plastic material, the overall weight of the exhaust gas recirculation valve is obviously reduced, cost is reduced, corrosion of acidic materials in exhaust gas can be avoided, the integrated injection molding structure of the valve body and the steel sleeve is good in abrasion resistance, abrasion of an exhaust gas channel is avoided, and the exhaust gas recirculation valve can be used under the high-temperature and low-temperature conditions; and the overall sealing performance is improved.

Description

Technical Field

[0001] The invention relates to a pump valve, in particular to an exhaust gas recirculation valve used in a hybrid electric vehicle. Background Art

[0002] The exhaust gas recirculation valve is a mechatronic product used to guide the exhaust gas of hybrid vehicles back to the intake pipe to participate in combustion again and can adjust the amount of recirculation. After the gasoline is burned in the engine, part of the exhaust gas can enter the intake pipe again through the exhaust gas recirculation valve to participate in combustion. This process can make the fuel burn more fully and reduce energy consumption; at the same time, it can reduce the temperature of the engine combustion chamber and inhibit NO x The exhaust gas recirculation valve (EGR valve) currently used in hybrid vehicles has a valve body made of metal, which is heavy and prone to corrosion. It is also possible to only pay attention to preventing the exhaust gas from entering the cavity of the valve body and causing damage, but ignore that the exhaust gas will enter the valve body through the gap between the valve stem and the valve body, causing the valve stem to get stuck, seriously affecting the operation of the valve. Summary of the invention

[0003] The object of the present invention is to overcome the above-mentioned deficiencies and provide a lightweight, corrosion-resistant and high-temperature-resistant lightweight exhaust gas recirculation valve.

[0004] The objective of the present invention is achieved through the following technical scheme: a lightweight exhaust gas recirculation valve, comprising a valve body and an outer cover, a valve stem transmission mechanism is installed on the valve body and between the valve body and the outer cover, the valve stem transmission mechanism comprises a transmission power source, a driving gear, an intermediate gear, and a driven gear connected in sequence, the driven gear is connected to the valve stem through a return spring, a steel sleeve is installed in the valve body, the valve stem is hollowed out in the steel sleeve and a valve plate is installed on the middle part of the valve stem, the steel sleeve has an exhaust gas channel corresponding to the position of the valve plate, the valve body is made of plastic and is an integrated injection molding structure with the steel sleeve.

[0005] The outer surface of the steel sleeve and the junction with the valve body have a limit structure, which can better limit the circumferential rotation of the steel sleeve. An upper bearing and a lower bearing are respectively installed between the valve stem and the valve body, and the upper bearing and the lower bearing are embedded in the steel sleeve.

[0006] After adopting the structure of the present invention, the driven gear drives the valve stem to rotate so that the valve plate is rotationally opened and closed relative to the exhaust gas channel of the steel sleeve, thereby avoiding the wear of the exhaust gas channel due to the frequent opening and closing of the valve plate, and improving the sealing of the valve plate when it is closed; the valve body is made of high-temperature resistant and high-strength plastic material, which significantly reduces the overall weight of the exhaust gas recirculation valve product, reduces the cost, and can avoid corrosion by acidic substances in the exhaust gas. The integrated injection molding structure of the valve body and the steel sleeve has good wear resistance, avoids wear of the exhaust gas channel, and can be used under high and low temperature conditions; the setting of the upper and lower bearings can prevent exhaust gas impurities from entering the gap between the valve stem and the valve body and causing the valve stem to become stuck, thereby improving the overall sealing performance. BRIEF DESCRIPTION OF THE DRAWINGS

[0007] The present invention is further described in detail below in conjunction with the accompanying drawings and implementation modes.

[0008] Figure 1 It is a schematic diagram of the structure of the present invention (the valve body and the outer cover are in a separated state).

[0009] Figure 2 for Figure 1 Partial cross-sectional view.

[0010] Figure 3 for Figure 1 Schematic diagram of the structure of the steel sleeve (with a limiting structure).

[0011] Figure 4 for Figure 1 Schematic diagram of the structure of the steel sleeve and the valve plate docking. DETAILED DESCRIPTION

[0012] Reference Figures 1 to 4 It can be seen that the lightweight exhaust gas recirculation valve (i.e., EGR valve) applied to the hybrid vehicle engine of the present invention comprises a valve body 1 and an outer cover 2. A valve stem transmission mechanism is installed on the valve body 1 and between the valve body 1 and the outer cover 2. The valve stem transmission mechanism comprises a transmission power source 35 (a driving motor), a driving gear 31, an intermediate gear 32 (installed on a gear shaft 33), and a driven gear 34 (a fan gear) connected in sequence. The driven gear 34 is connected to the valve stem 6 through a return spring 4. A steel sleeve 8 is installed in the valve body 1. The valve stem 6 is hollowed in the steel sleeve 8 and a valve plate 7 is installed on the middle part of the valve stem 6. The steel sleeve 8 has an exhaust gas channel 11 corresponding to the position of the valve plate 7. The valve body 1 is made of plastic material (having high temperature resistance, corrosion resistance, and high strength, and can be made of polyphenylene sulfide PPS plastic material, which is a special engineering plastic) and is an integrated injection molding structure with the steel sleeve 8 (steel).

[0013] The outer surface of the steel sleeve 8 and the junction with the valve body 1 are provided with a limiting structure 10 (a plurality of limiting protrusions forming a plurality of diamond-shaped limiting structures, such as Figure 3As shown in the figure), it can effectively limit the circumferential rotation of the steel sleeve. Figure 4 As shown, the valve plate 7 is obliquely arranged in the exhaust gas passage 11 of the steel sleeve 8 to enhance its sealing performance and unidirectional rotation limiting function. An upper bearing 5 and a lower bearing 9 are respectively installed between the valve stem 6 and the valve body 1, and the upper bearing 5 and the lower bearing 9 are both embedded in the steel sleeve 8.

[0014] When the EGR valve is working, the transmission power source (drive motor) 35 is energized, the driving gear 31 rotates rightward along with the output shaft of the drive motor, the driving gear 31 meshes with the intermediate gear 32, drives the intermediate gear 32 to rotate, and the intermediate gear 32 meshes with the driven gear (sector gear) 34, which can overcome the elastic force of the return spring 4 and drive the driven gear 34 to rotate rightward; when the drive motor reverses, the driving gear 31 rotates leftward along with the output shaft of the drive motor, drives the intermediate gear 32 to rotate, and the driven gear 34 meshed with the intermediate gear 32 can rotate leftward under the action of the return spring 4. The drive motor drives the valve stem 6 through the intermediate gear and the driven gear to finally realize the opening and closing of the exhaust gas channel between the valve plate 7 and the steel sleeve 8, thereby controlling the exhaust gas flow.

Claims

1. A lightweight exhaust gas recirculation valve, comprising a valve body and an outer cover, wherein a valve stem transmission mechanism is installed on the valve body and between the valve body and the outer cover, wherein the valve stem transmission mechanism comprises a transmission power source, a driving gear, an intermediate gear, and a driven gear connected in sequence, wherein the driven gear is connected to the valve stem through a return spring, and wherein: A steel sleeve is installed in the valve body, the valve stem passes through the steel sleeve and a valve plate is installed on the middle part of the valve stem, the steel sleeve has an exhaust gas channel corresponding to the position of the valve plate, the valve body is made of plastic and is an integrated injection molding structure with the steel sleeve, and a limiting structure is provided on the outer surface of the steel sleeve and at the connection with the valve body.

2. The lightweight exhaust gas recirculation valve according to claim 1, characterized in that: The limiting structure is a plurality of diamond-shaped limiting structures formed by a plurality of limiting protrusion strips.

3. The lightweight exhaust gas recirculation valve according to claim 1 or 2, characterized in that: An upper bearing and a lower bearing are respectively arranged between the valve stem and the valve body, and the upper bearing and the lower bearing are both embedded in the steel sleeve.

4. The lightweight exhaust gas recirculation valve according to claim 1 or 2, characterized in that: The valve plate is arranged obliquely in the exhaust gas passage of the steel sleeve.

5. The lightweight exhaust gas recirculation valve according to claim 1 or 2, characterized in that: The valve body is made of polyphenylene sulfide PPS plastic material.

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