Anti-clamping stagnation type exhaust gas recirculation valve
By introducing a combination of small bearings and bearing pins and torsion spring structure into the transmission gear of the exhaust gas recirculation valve, the problems of insufficient reverse closing force and insufficient sealing properties of the valve stem are solved, and the smooth movement of the valve stem and good sealing performance are achieved, ensuring the normal operation of the exhaust gas recirculation valve.
Patent Information
- Application Number
- CN202421825723.0
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-07-31
- Publication Date
- 2025-03-18
- Estimated Expiration
- 2034-07-31
AI Technical Summary
The valve stem and valve plate of the existing exhaust gas recirculation valve are insufficient in reverse closing force, and the single-sided cam groove structure of the transmission gear is only used for opening, and the closing position is not in the center line of the valve stem, resulting in the valve stem stagnation and insufficient sealing, affecting normal operation.
An anti-jamming exhaust gas recirculation valve is designed, and the opening and closing forces of the valve stem are ensured to be in the center line by installing a combination of a small bearing and a bearing pin in the cam groove of the transmission gear, and connected to the valve stem through a connecting block. At the same time, the torsion spring acts on the transmission gear, improving the situation of insufficient valve stem closing force, and preventing circumferential deflection through the fitting limit of the small bearing.
It achieves smooth movement of the valve stem and good sealing performance, prevents stagnation, and ensures the normal operation and quality of the exhaust gas recirculation valve.
Smart Images
Figure CN222633327U_ABST
Abstract
Description
Technical Field
[0001] The invention relates to a pump valve, in particular to an exhaust gas recirculation valve used in automobiles. Background Art
[0002] The exhaust gas recirculation valve is a mechatronic product used to guide the exhaust gas of automobiles (especially 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 insufficient reverse closing force of the valve stem and valve disc, and the single-sided cam groove structure of the transmission gear is only used for opening. Its closing position is not at the center line of the valve stem, and the matching clearance is too large, the closing force is attenuated and insufficient, which leads to the valve stem being stuck and the valve disc closing sealing being insufficient, affecting the normal operation of the exhaust gas recirculation valve. Summary of the invention
[0003] The object of the present invention is to overcome the above-mentioned disadvantages and to provide an anti-stuck exhaust gas recirculation valve with smooth valve stem operation and good sealing performance.
[0004] The object of the present invention is achieved through the following technical scheme: an anti-stuck exhaust gas recirculation valve, including a valve body and an outer cover, wherein a connected valve stem driving source and a transmission gear are installed in the valve body, a combination of a small bearing and a bearing pin is installed in the cam groove of the transmission gear, the bearing pin is connected to the valve stem through a connecting block, the lower end of the valve stem is connected to a valve seat installed in the valve body through a valve plate, the back of the transmission gear is connected to the gear shaft, and a torsion spring is connected in the valve body and on the back of the transmission gear.
[0005] The valve body and the middle part of the valve stem are respectively covered with guide bushings and sealing rings arranged up and down to enhance the sealing performance. The opening and closing positions of the cam groove of the transmission gear are both located on the center line of the valve stem.
[0006] After adopting the structure of the present invention, the setting of the connecting block ensures that the opening force and closing force of the valve stem moving up and down are located at the center line of the valve stem. At the same time, the setting of the torsion spring also acts on the transmission gear to improve the situation of insufficient closing force of the valve stem, so that the valve plate has good sealing performance when closing; the inner wall of the cam groove fits with the small bearing, which has an anti-deflection effect. By limiting the fit of the small bearing, circumferential deflection during the valve stem transmission process is effectively prevented. The present invention has good sealing performance, can effectively prevent the valve stem from getting stuck, makes the valve stem move smoothly, and ensures the quality and normal operation of the exhaust gas recirculation valve. 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 structural schematic diagram of the present invention.
[0009] Figure 2 for Figure 1 Schematic diagram of the structure in which the transmission gear, connecting block and valve stem are connected. DETAILED DESCRIPTION
[0010] Reference Figure 1 , Figure 2 It can be seen that the anti-stuck 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 11. A connected valve stem driving source 12 (a driving motor) and a transmission gear 5 are installed in the valve body 1. A combination of a small bearing 6 and a bearing pin 7 (the small bearing is sleeved on the bearing pin and installed in the cam groove) is installed in the cam groove 51 (the front side of the transmission gear) of the transmission gear 5. The bearing pin 7 is connected to the valve stem 9 through a connecting block 8. The lower end of the valve stem 9 is connected to a valve seat 13 installed in the valve body through a valve plate 10. The back side of the transmission gear 5 (the reverse side of its cam groove) is connected to a gear shaft 3 (a gear bearing 2 is installed on the gear shaft 3). A torsion spring 4 is connected in the valve body 1 and on the back side of the transmission gear 5 (the torsion spring 4 is parallel to, adjacent to, and on the same side as the gear shaft 3).
[0011] In the valve body 1, and in the middle of the valve stem 9, there are respectively sleeved with a guide bushing 14 (in the upper position) and a sealing ring 15 (in the lower position) arranged up and down, which enhances its sealing performance and effectively prevents exhaust gas from entering the upper part of the valve body. The opening and closing positions of the cam groove 51 of the transmission gear 5 are both on the center line of the valve stem 9. The setting of the connecting block 8 ensures that the opening force and closing force of the valve stem moving up and down are located on the center line of the valve stem. At the same time, the setting of the torsion spring 4 also acts on the transmission gear 5 and improves the situation of insufficient closing force of the valve stem through the connecting block 8. The inner wall of the cam groove fits with the small bearing 6, which has an anti-deflection effect. By limiting the fit of the small bearing, circumferential deflection is effectively prevented during the transmission process of the valve stem. The valve stem driving source 12 (a driving motor) works to drive the transmission gear 5 to rotate, so that the small bearing 6 and the bearing pin 7 move in its cam groove 51, thereby driving the valve stem 9 to move up and down through the connecting block 8, causing the valve plate 10 and the valve seat 13 to open or close.
Claims
1. An anti-stuck exhaust gas recirculation valve, comprising a valve body and an outer cover, wherein a connected valve stem drive source and a transmission gear are installed in the valve body, characterized in that: A combination of a small bearing and a bearing pin is installed in the cam groove of the transmission gear. The bearing pin is connected to the valve stem through a connecting block. The lower end of the valve stem is connected to a valve seat installed in the valve body through a valve plate. The back of the transmission gear is connected to the gear shaft. A torsion spring is connected in the valve body and on the back of the transmission gear.
2. The anti-stuck exhaust gas recirculation valve according to claim 1, characterized in that: A guide bushing and a sealing ring are respectively sleeved in the valve body and at the middle of the valve stem.
3. The anti-stuck exhaust gas recirculation valve according to claim 1 or 2, characterized in that: The opening and closing positions of the cam groove of the transmission gear are both located on the center line of the valve stem.
4. The anti-stuck exhaust gas recirculation valve according to claim 1 or 2, characterized in that: The torsion spring and the gear shaft are located parallel to, adjacent to, and on the same side.