Transmission mechanism of EGR lift valve

Abstract

The utility model discloses a transmission mechanism of an EGR (Exhaust Gas Recirculation) lift valve, which relates to the technical field of exhaust gas circulation and comprises a lift valve shell, a gear mechanism and a connecting rod mechanism, the lift valve shell comprises a lift valve base, and one end of the lift valve base is communicated with an opening in the upper end of the axial sleeve; the lower end opening of the axial sleeve is communicated with the upper end opening of the first cavity, and the lower end opening of the first cavity is communicated with the upper end opening of the second cavity; a seat ring is installed at the joint of the first cavity and the second cavity in a sealed mode. The gear mechanism is installed in the lifting valve base, and the connecting rod mechanism slides relative to the axial sleeve. The lifting valve base, the seat ring and the axial sleeve are integrally formed in an injection molding mode. According to the transmission mechanism of the EGR lift valve, the production cost is reduced, the delay of the valve is reduced, and the production efficiency is improved.

Description

Technical Field

[0001] This utility model relates to the field of waste gas recirculation technology, and in particular to a transmission mechanism for an EGR lift valve. Background Technology

[0002] Currently, the mainstream EGR valves used in exhaust gas recirculation systems typically have an aluminum alloy main body. Meanwhile, the internal transmission mechanism, including the valve base, guide sleeve, heat shield, scraper, support, valve plate, and valve stem, is also made of metal. Due to their high density and thermal conductivity, these components are usually quite heavy. Furthermore, system temperature is easily conducted to the actuator, potentially causing actuator failure. Additionally, the assembly of these components is complex and requires high precision, making them prone to process control and product quality issues.

[0003] The problems with mainstream aluminum alloy EGR valves are as follows:

[0004] 1) Existing transmissions are mostly cam and pushrod drives, which are relatively complex mechanisms;

[0005] 2) High processing precision is required; when tolerance fluctuations occur, the adhesive is prone to jamming.

[0006] 3) Functional stability is generally poor and is easily affected by factors such as processing technology, lifespan, and environment.

[0007] 4) Condensate containing chloride ions causes corrosion problems;

[0008] 5) Corrosion substances can easily enter the guide sleeve, causing valve jamming;

[0009] 6) Long-term corrosion leads to after-sales quality problems.

[0010] Developing a transmission mechanism for an EGR lift valve to reduce production costs, decrease valve lag, and improve production efficiency has become a technical challenge that urgently needs to be addressed by those skilled in the art. Utility Model Content

[0011] The purpose of this invention is to provide a transmission mechanism for an EGR lift valve, thereby solving the problems listed in the background art.

[0012] To solve the above-mentioned technical problems, the present invention adopts the following technical solution:

[0013] This utility model discloses a transmission mechanism for an EGR lift valve, comprising a lift valve housing, a gear mechanism, and a linkage mechanism, wherein the gear mechanism is connected to the linkage mechanism in a transmission manner.

[0014] The lifting valve housing includes a lifting valve base, one end of which is connected to the upper opening of the axial sleeve;

[0015] The lower opening of the axial sleeve is connected to the upper opening of the first cavity, and the lower opening of the first cavity is connected to the upper opening of the second cavity.

[0016] A seat ring is sealed at the connection between the first cavity and the second cavity;

[0017] The gear mechanism is installed inside the lifting valve base, and the linkage mechanism slides relative to the axial sleeve.

[0018] The lifting valve base, the seat ring, and the axial sleeve are integrally injection molded.

[0019] Preferably, the gear mechanism includes a main gear shaft, which is fixedly installed on the inner side wall of the lifting valve base, and a main gear is slidably installed on the main gear shaft, the main gear meshing with the motor gear.

[0020] Preferably, a male spiral is installed on the side wall of the main gear, a gear connecting rod is slidably installed on the male spiral, and the main gear is movably connected to the upper end joint of the gear connecting rod through a first metal head.

[0021] Preferably, the linkage mechanism includes a valve stem, the upper outer wall of the valve stem is fixedly connected to the transmission seat, and both sides of the transmission seat abut against the spring;

[0022] The lower end of the valve stem is fixedly connected to the valve plate.

[0023] Preferably, the upper end of the valve stem is rotatably connected to the gear connecting rod via a second metal head, and the middle part of the valve stem slides relative to the axial sleeve.

[0024] Preferably, the upper surface of the valve plate abuts against the lower surface of the seat ring.

[0025] Preferably, it further includes a heat insulation cover, which is installed between the lower end opening of the axial sleeve and the opposite surface of the upper end opening of the first cavity, and the heat insulation cover abuts against the outer peripheral surface of the valve stem.

[0026] Compared with the prior art, the beneficial technical effects of this utility model are as follows:

[0027] A transmission mechanism for an EGR lift valve utilizes a gear transmission structure. The rotational motion of the motor gear is transmitted to the main gear, causing the main gear to rotate synchronously. This drives the gear connecting rod to rotate along a specific linear motion trajectory on the main gear. The valve stem, driven by the connecting rod, reciprocates up and down with the rotation of the gear. This ensures the linearity and stability of the valve stem's movement. Furthermore, the main gear is manufactured using injection molding, resulting in lower cost and dimensional risks, and a simpler manufacturing process. This solves the problem of valve jamming caused by corrosion of the aluminum base, improving the vehicle's long-term service life. Additionally, the injection-molded structure of the base reduces the difficulty and time required for the overall product's production and assembly processes, thus lowering manufacturing costs. Attached Figure Description

[0028] The present invention will be further described below with reference to the accompanying drawings.

[0029] Figure 1 This is a cross-sectional schematic diagram of the transmission mechanism of an EGR lift valve according to this utility model;

[0030] Figure 2 This is a front view of the assembly of the gear mechanism and linkage mechanism of this utility model;

[0031] Figure 3 This is a side view of the gear mechanism and linkage mechanism assembled according to this utility model;

[0032] Figure 4 This is a three-dimensional schematic diagram of the transmission mechanism of an EGR lift valve according to the present invention;

[0033] Figure 5 This is a schematic diagram of the motion state of the gear connecting rod of this utility model.

[0034] Explanation of reference numerals in the attached drawings: 1. Valve plate; 2. Heat insulation cover; 3. Valve stem; 4. Transmission seat; 5. Gear connecting rod; 6. Lift valve base; 7. Main gear; 8. Motor gear; 9. Seat ring; 10. Main gear shaft; 11. First metal head; 12. Second metal head; 13. Axial sleeve; 14. First cavity; 15. Second cavity. Detailed Implementation

[0035] To make the technical problem to be solved, the technical solution, and the beneficial effects of this utility model clearer, the present utility model will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain this utility model and are not intended to limit this utility model.

[0036] like Figure 1-5 As shown, a transmission mechanism for an EGR lift valve includes a lift valve housing, a gear mechanism, and a linkage mechanism, wherein the gear mechanism is drivingly connected to the linkage mechanism.

[0037] The lifting valve housing includes a lifting valve base 6, one end of which is connected to the upper opening of the axial sleeve 13;

[0038] The gear mechanism is installed inside the lifting valve base 6, and the linkage mechanism slides relative to the axial sleeve 13.

[0039] Specifically, the lower opening of the axial sleeve 13 is connected to the upper opening of the first cavity 14, and the lower opening of the first cavity 14 is connected to the upper opening of the second cavity 15.

[0040] A seat ring 9 is sealed at the connection between the first cavity 14 and the second cavity 15.

[0041] Specifically, the gear mechanism includes a main gear shaft 10, which is fixedly installed on the inner side wall of the lifting valve base 6. A main gear 7 is slidably installed on the main gear shaft 10, and the main gear 7 meshes with the motor gear 8. Furthermore, the main gear is produced by injection molding, which has lower cost and size risks and a simpler production process.

[0042] Specifically, a male spiral is installed on the side wall of the main gear 7, and a gear connecting rod 5 is slidably installed on the male spiral. The main gear 7 is movably connected to the upper end joint of the gear connecting rod 5 through a first metal head 11.

[0043] like Figure 5 As shown, the motion trajectory of the gear connecting rod ensures the linearity and stability of the valve stem motion.

[0044] Specifically, the linkage mechanism includes a valve stem 3, the upper outer wall of the valve stem 3 is fixedly connected to the transmission seat 4, the two sides of the transmission seat 4 are in contact with springs, and the lower end of the valve stem 3 is fixedly connected to the valve plate 1. The spring is a compression spring. Under the action of the compression spring, the transmission seat is ensured to be in contact with the lower end of the gear connecting rod, so that the transmission seat can be reset during the downward movement.

[0045] Furthermore, it enables the valve stem to drive the valve plate to reciprocate.

[0046] Specifically, the upper end of the valve stem 3 is rotatably connected to the gear connecting rod 5 via the second metal head 12, and the middle part of the valve stem 3 slides relative to the axial sleeve 13.

[0047] Specifically, the upper surface of the valve plate 1 abuts against the lower surface of the seat ring 9.

[0048] Specifically, it also includes a heat insulation cover 2, which is installed between the lower end opening of the axial sleeve 13 and the opposite surface of the upper end opening of the first cavity 14, and the heat insulation cover 2 abuts against the outer peripheral surface of the valve stem 3.

[0049] Specifically, the lifting valve base 6, seat ring 9, and axial sleeve 13 are integrally injection molded, which reduces the difficulty and cycle of the overall product production and assembly process, and reduces the product manufacturing cost.

[0050] The working principle of this utility model:

[0051] 1) The meshing of the motor gear with the main gear drives the main gear to rotate, realizing the first power transmission;

[0052] 2) The main gear is connected to the gear connecting rod through the first metal ball head, which transmits power to the gear connecting rod and guides the gear screw to move along the male spiral structure curve of the main gear, realizing the second transmission of power. Furthermore, during the second transmission process, due to the special trajectory design of the male spiral, the movement of the connecting rod remains linear and smooth, with no obvious power loss or jamming point.

[0053] 3) The gear connecting rod is connected to the valve stem through the second metal ball head, which drives the valve stem to move up and down, realizing the third transmission of power, and realizes the opening and closing of the air passage through the contact and disengagement of the valve plate and the seat ring.

[0054] It should be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, method, article, or apparatus.

[0055] The embodiments described above are merely preferred embodiments of the present utility model and are not intended to limit the scope of the present utility model. Various modifications and improvements made to the technical solutions of the present utility model by those skilled in the art without departing from the spirit of the present utility model should fall within the protection scope defined by the claims of the present utility model.

Claims

1. An actuator for an EGR poppet valve, characterized by: The application relates to a lifting valve, which comprises a lifting valve shell, a gear mechanism and a connecting rod mechanism. The lifting valve shell comprises a lifting valve base (6), one end of which is communicated with the upper end opening of an axial sleeve (13). The lower end opening of the axial sleeve (13) is communicated with the upper end opening of a first cavity (14), and the lower end opening of the first cavity (14) is communicated with the upper end opening of a second cavity (15). A seat ring (9) is sealingly arranged at the joint of the first cavity (14) and the second cavity (15). The gear mechanism is arranged in the interior of the lifting valve base (6), and the connecting rod mechanism is slidably arranged relative to the axial sleeve (13). The lifting valve base (6), the seat ring (9) and the axial sleeve (13) are integrally injection molded.

2. An EGR poppet valve actuator as set forth in claim 1 wherein: The gear mechanism comprises a main gear shaft (10) which is fixedly arranged on the inner side wall of the lifting valve base (6), and a main gear (7) which is slidably arranged on the main gear shaft (10) and is engaged with a motor gear (8).

3. An EGR poppet valve actuator as set forth in claim 2 wherein: A male screw is arranged on the side wall of the main gear (7), a gear connecting rod (5) is slidably arranged on the male screw, and the main gear (7) is movably connected with the upper end joint of the gear connecting rod (5) through a first metal head (11).

4. An EGR poppet valve actuator as set forth in claim 3 wherein: The connecting rod mechanism comprises a valve rod (3), the upper end outer side wall of which is fixedly connected with a transmission seat (4), and the two sides of the transmission seat (4) are abutted by springs. The lower end of the valve rod (3) is fixedly connected with a valve piece (1).

5. An EGR poppet valve actuator as set forth in claim 4 wherein: The upper end of the valve rod (3) is rotatably connected with the gear connecting rod (5) through a second metal head (12), and the middle part of the valve rod (3) is slidably arranged relative to the axial sleeve (13).

6. An EGR poppet valve actuator as set forth in claim 4 wherein: The upper surface of the valve piece (1) is abutted by the lower surface of the seat ring (9).

7. An EGR poppet valve actuator drive mechanism as set forth in claim 4 wherein: A heat insulation cover (2) is further arranged between the lower end opening of the axial sleeve (13) and the opposite surface of the upper end opening of the first cavity (14), and the heat insulation cover (2) is abutted by the outer circumferential surface of the valve rod (3).

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