Exhaust gas recirculation valve

Abstract

This invention discloses an exhaust gas recirculation valve, comprising: a housing assembly; a valve plate assembly disposed within the housing assembly, including a rotating shaft and a valve plate, one end of the rotating shaft being rotatably mounted within the housing assembly, and the other end being connected to the valve plate, the rotation of the rotating shaft driving the valve plate to rotate; and a drive assembly for driving the rotating shaft to rotate. The advantages of this invention are that the single-arm rotating shaft design reduces the material used for the rotating shaft, eliminates the need for a lower rotating shaft bushing and bushing cover, lowers product costs, allows for more flexible placement of the exhaust gas recirculation valve in the engine compartment, and reduces the need for structures such as the lower rotating shaft bushing, preventing water accumulation that could cause cold start jamming.

Description

Technical Field

[0001] This invention relates to the field of valve technology, and more specifically to an exhaust gas recirculation valve. Background Technology

[0002] Exhaust gas recirculation (EGR) slows down the combustion process of exhaust gases in a car engine by reintroducing them into the combustion chamber. This not only helps control the maximum combustion temperature but also reduces nitrogen oxide (NOx) emissions from vehicle exhaust. In existing technologies, the exhaust gas recirculation valve stem is fixed at both ends, typically employing a double-support structure. This means both ends of the rotating shaft are in contact with and mounted on the valve body, requiring two sets of upper and lower bearing seats for support. For example, the invention patent with authorization publication number CN 205805768 U discloses an exhaust gas recirculation valve where bearings are installed at both ends of the valve stem, allowing both ends to rotate. This structure is relatively complex, with many parts, resulting in higher manufacturing costs. Furthermore, the contact of multiple components and the presence of water accelerate corrosion of metal parts, reducing the valve's lifespan. Summary of the Invention

[0003] To solve the above-mentioned technical problems, the present invention provides an exhaust gas recirculation valve in which the rotating shaft is only fixed in contact with the upper part of the valve body and suspended and separated from the lower part of the valve body, forming a single-arm structure. This structure can reduce the material bearing assembly of the rotating shaft and reduce product cost.

[0004] Specifically, this invention discloses an exhaust gas recirculation valve, comprising:

[0005] Housing assembly;

[0006] A valve plate assembly is disposed within the housing assembly and includes a rotating shaft and a valve plate. One end of the rotating shaft is rotatably mounted within the housing assembly, and the other end is connected to the valve plate. Rotation of the rotating shaft drives the valve plate to rotate.

[0007] A drive component for driving the shaft to rotate.

[0008] The advantages of this invention are that the single-arm structure reduces the material used for the shaft, eliminates the lower shaft bushing and bushing cover, reduces product costs, makes the arrangement of the exhaust gas recirculation valve in the engine compartment more flexible, and reduces the structure such as the shaft bushing under the housing, so that the new structure can avoid water accumulation causing cold start jamming.

[0009] Furthermore, the housing assembly includes an upper cover and a lower housing. A sleeve for accommodating the valve plate is provided inside the lower housing. The lower end of the rotating shaft extends into the sleeve, and the lower end of the rotating shaft does not contact the bottom of the sleeve. The valve plate is located inside the sleeve.

[0010] The advantages of adopting the above technical solution are that the valve plate can rotate under the drive of the rotating shaft inside the sleeve, thereby adjusting the cross-section of the exhaust gas flow and controlling the flow rate of exhaust gas recirculation. The sleeve provides a stable space for the rotation of the valve plate and plays a certain guiding and restraining role for the exhaust gas, preventing the exhaust gas from spreading randomly inside the shell. The design that the lower end of the rotating shaft does not contact the bottom of the sleeve is the key feature of the single-arm structure, which effectively avoids the water accumulation problem that may be caused by the lower support in the traditional double-support structure, reduces the risk of component corrosion and cold start jamming caused by water accumulation, and further improves the reliability and service life of the valve.

[0011] Furthermore, the rotating shaft is provided with a mounting surface and a mounting hole thereon, and the valve plate is fixed to the rotating shaft by a locking member installed in the mounting hole.

[0012] The advantage of adopting the above technical solution is that by setting the installation plane and locking the valve plate, the contact area between the valve plate and the rotating shaft can be increased, making the connection more stable, preventing the valve plate from shaking or shifting during rotation, and ensuring the accuracy of exhaust gas flow regulation.

[0013] Furthermore, the drive assembly includes a motor and a gear assembly, the housing assembly has a receiving cavity, the motor is installed in the receiving cavity, and the motor is connected to the rotating shaft through the gear assembly.

[0014] Furthermore, the gear assembly includes: a first gear, an intermediate gear, and a second gear. The first gear is connected to the output end of the motor, the second gear is connected to the rotating shaft, and the intermediate gear is located between the first gear and the second gear. It includes an upper gear and a lower gear. The upper gear meshes with the first gear, and the lower gear meshes with the second gear.

[0015] The advantages of adopting the above technical solution are that setting up a motor to drive multiple gears to achieve shaft rotation, and using the double-layer structure of the intermediate gear to effectively buffer transmission impact, reduce noise and wear, and at the same time make the structure more compact.

[0016] Furthermore, the second gear is a sector gear.

[0017] The advantage of adopting the above technical solution is that the sector gear effectively reduces the internal space occupied, making the structure more compact.

[0018] Furthermore, the housing assembly houses a bearing and a bushing, with the rotating shaft passing through the inner bore of the bearing.

[0019] The advantage of adopting the above technical solution is that the bearing and bushing can provide good support and guidance for the rotating shaft, ensuring the stability and concentricity of the rotating shaft during rotation, and making the opening and closing of the valve plate smoother.

[0020] Furthermore, multiple buckles are provided between the upper cover and the lower housing, each buckle having a locking portion at both ends, and each locking portion having a protruding block, the protruding block being inclined.

[0021] The advantages of adopting the above technical solution are that the buckle design facilitates the installation of the upper cover and the lower housing, connecting the upper cover and the lower housing quickly and securely, improving assembly efficiency. The inclined design of the protruding block of the snap-fit ​​part can provide a certain pre-tightening force during assembly, enhancing the sealing and firmness of the connection. Attached Figure Description

[0022] To more clearly illustrate the technical solutions in the embodiments of the present invention, the accompanying drawings used in the description of the embodiments or the prior art will be briefly introduced below.

[0023] Figure 1 This is a schematic diagram of the overall structure of the exhaust gas recirculation valve of the present invention.

[0024] Figure 2 This is a structural diagram of the present invention with the top cover removed.

[0025] Figure 3 This is a cross-sectional structural diagram of the present invention.

[0026] Figure 4 This is a diagram of the gear assembly connection structure of the present invention.

[0027] Figure 5 This is a structural diagram of the rotating shaft of the present invention.

[0028] Figure 6 This is a diagram of the snap-fit ​​structure of the present invention.

[0029] Figure 7 This is an overall diagram of the invention.

[0030] Figure 8 This is an enlarged view of point A in the present invention.

[0031] The reference numerals used in the attached figures are as follows:

[0032] Housing assembly 1; upper cover 11; lower housing 12; sleeve 13; rotating shaft 2; mounting hole 21; valve plate 3; motor 4; first gear 5; intermediate gear 51; second gear 52; upper gear 511; lower gear 512; bearing 6; buckle 7; protrusion 71. Detailed Implementation

[0033] The present invention will now be described in further detail with reference to the accompanying drawings.

[0034] like Figure 1-6 As shown, the present invention discloses an exhaust gas recirculation valve, comprising:

[0035] Housing assembly 1;

[0036] A valve plate assembly is disposed within the housing assembly 1, including a rotating shaft 2 and a valve plate 3. One end of the rotating shaft 2 is rotatably mounted within the housing assembly 1, and the other end is connected to the valve plate 3. Rotation of the rotating shaft 2 drives the valve plate 3 to rotate.

[0037] A drive component for driving the rotating shaft 2 to rotate.

[0038] The advantages of this invention are that the single-arm structure of the rotating shaft 2 reduces the material used for the rotating shaft 2, eliminates the lower rotating shaft 2 bushing and bushing cover plate, reduces product cost, makes the arrangement of the exhaust gas recirculation valve in the engine compartment more flexible, and reduces the structure such as the rotating shaft 2 bushing under the housing, so that the new structure can avoid water accumulation causing cold start jamming.

[0039] In some embodiments, the housing assembly 1 includes an upper cover 11 and a lower housing 12. A sleeve 13 for accommodating a valve plate 3 is provided inside the lower housing 12. The sleeve 13 is fixedly installed inside the housing. The side of the sleeve 13 has a through hole for the passage of a rotating shaft 2. The sleeve 13 is perpendicular to the axis of the rotating shaft 2. The lower end of the rotating shaft 2 extends into the sleeve 13, and the lower end of the rotating shaft 2 does not contact the bottom of the sleeve 13, forming a single-arm structure. The valve plate 3 is located inside the sleeve 13 and connected to the rotating shaft. Driven by the rotating shaft 2, the opening degree of the valve plate can be steplessly adjusted between 0% (fully closed) and 100% (fully open), thereby precisely controlling the flow rate of recirculated exhaust gas to meet the needs of the engine under different operating conditions. The upper end of the rotating shaft 2 is rotatably fixed by a bearing 6 installed in the lower housing. A bushing is sleeved on the rotating shaft 2 and located below the bearing 6, serving as a support and positioning function.

[0040] The rotating shaft 2 has a mounting surface located on its lower side, with a mounting hole 21 on it. The valve plate 3 is fixed to the rotating shaft 2 by a locking device installed in the mounting hole 21. The locking device can be a screw or the like, which fixes the valve plate 3 to the rotating shaft 2 and prevents the valve plate 3 from shaking.

[0041] In some implementations, the drive assembly includes a motor 4 and a gear assembly. A receiving cavity is provided within the housing assembly 1, and the motor 4 is installed within the receiving cavity. The motor 4 is connected to the rotating shaft 2 via the gear assembly. The gear assembly includes a first gear 5, an intermediate gear 51, and a second gear 52. The first gear 5 is connected to the output end of the motor 4, and the second gear 52 is connected to the rotating shaft 2. The intermediate gear 51 is located between the first gear 5 and the second gear 52. A wheel axle for mounting the intermediate gear 51 is provided within the lower housing 12. The wheel axle is rotatably mounted. The intermediate gear 51 includes an upper gear 511 and a lower gear 512. The upper gear 511 meshes with the first gear 5, and the lower gear 512 meshes with the second gear 52. The upper gear 511 and the lower gear 512 are fixed and rotate together. The advantage of this two-layer gear arrangement is that it can effectively adjust the transmission ratio, reduce the impact and vibration that may be caused by direct drive from the motor 4, and allow for a reasonable arrangement of gear positions within a limited space, avoiding motion interference between gears and ensuring the compactness and efficient transmission of the gear assembly. The second gear 52 is a sector gear and is fixedly installed with the rotating shaft 2. During operation, the motor 4 drives the first gear 5 to rotate, transmitting power to the intermediate gear 51. The intermediate gear 51 transmits power to the second gear 52 through the lower gear 512. The second gear 52 drives the rotating shaft 2 to rotate, which in turn drives the valve plate 3 to open and close.

[0042] In some implementation schemes, such as Figure 7-8 As shown, multiple latches 7 are provided between the upper cover 11 and the lower housing 12. Each latch 7 has a locking portion at both ends, and each locking portion has a protruding block 71. The protruding block 71 is inclined and faces away from the upper cover 11. The locking portion is wavy, giving the entire latch 7 a certain degree of elasticity, allowing it to securely fasten the upper cover 11 and the lower housing 12. The upper housing has a mounting portion for installing the latches 7, with a groove inside. After locking, the end of the protruding block 71 abuts against the groove, preventing the latches 7 from disengaging outwards and ensuring the latches 7 are properly positioned. A sealing ring is also provided between the upper cover 11 and the lower housing 12.

[0043] The advantage of this invention is that the rotating shaft 2 is only fixed in contact with the upper part of the valve body and is suspended and separated from the lower part of the valve body, forming a single-arm structure. This structure can reduce the material used for the rotating shaft 2, eliminate the lower rotating shaft 2 bushing and bushing cover plate, and reduce product costs.

[0044] The single-arm structure allows for more flexible placement of the exhaust gas recirculation valve in the engine compartment.

[0045] The single-arm structure can reduce corrosion of the valve during use;

[0046] The single-arm structure reduces the need for structures such as the shaft bushing below the housing, allowing the new structure to avoid water accumulation that could cause jamming during cold starts.

[0047] For those skilled in the art, various modifications and improvements can be made without departing from the inventive concept of this invention, and these all fall within the protection scope of this invention.

Claims

1. An exhaust gas recirculation valve characterized by, include: Housing assembly (1); A valve plate assembly is disposed within the housing assembly (1) and includes a rotating shaft (2) and a valve plate (3). One end of the rotating shaft (2) is rotatably mounted within the housing assembly (1), and the other end is connected to the valve plate (3). The rotating shaft (2) drives the valve plate (3) to rotate. A drive component for driving the rotating shaft (2) to rotate.

2. The waste gas recirculation valve according to claim 1, characterized in that, The housing assembly (1) includes an upper cover (11) and a lower housing (12). The lower housing (12) is provided with a sleeve (13) for accommodating the valve plate (3). The lower end of the rotating shaft (2) extends into the sleeve (13). The lower end of the rotating shaft (2) does not contact the bottom of the sleeve (13). The valve plate (3) is located inside the sleeve (13).

3. The waste gas recirculation valve according to claim 2, characterized in that, The rotating shaft (2) is provided with an installation plane and an installation hole (21) thereon. The valve plate (3) is fixed to the rotating shaft (2) by a locking member installed in the installation hole (21).

4. The waste gas recirculation valve according to claim 1, characterized in that, The drive assembly includes a motor (4) and a gear assembly. The housing assembly (1) has a receiving cavity (14). The motor (4) is installed in the receiving cavity (14). The motor (4) is connected to the rotating shaft (2) through the gear assembly.

5. The waste gas recirculation valve according to claim 4, characterized in that, The gear assembly includes a first gear (5), an intermediate gear (51), and a second gear (52). The first gear (5) is connected to the output end of the motor (4), and the second gear (52) is connected to the rotating shaft (2). The intermediate gear (51) is located between the first gear (5) and the second gear (52), and includes an upper gear (511) and a lower gear (512). The upper gear (511) meshes with the first gear (5), and the lower gear (512) meshes with the second gear (52).

6. The waste gas recirculation valve according to claim 5, characterized in that, The second gear (52) is a sector gear.

7. The waste gas recirculation valve according to claim 1, characterized in that, The housing assembly (1) houses a bearing (6) and a bushing, and the shaft (2) passes through the inner hole of the bearing (6).

8. The waste gas recirculation valve according to claim 2, characterized in that, Multiple buckles (7) are provided between the upper cover (11) and the lower shell (12). The buckles (7) have snap-fit ​​parts at both ends, and the snap-fit ​​parts have protrusions (71). The protrusions (71) are inclined.

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