Separated EGR (exhaust gas recirculation) air mixing valve

Abstract

The utility model relates to a separating type EGR air mixing valve which comprises an EGR mixing pipe and an actuator, the EGR mixing pipe comprises a mixing pipe body and a valve shaft penetrating out of the mixing pipe body in the radial direction, the actuator comprises a shell and a driving part arranged in the shell, and the mixing pipe body and the shell are connected in an assembled mode through a fixing part. And a matching part which is in power connection with the driving part and is in power butt joint with the valve shaft is further arranged in the shell. According to the EGR air mixing valve, an EGR mixing valve and a mixing pipe in the prior art are integrally arranged, the occupied space of the EGR mixing valve and the occupied space of the mixing pipe are reduced, and on the basis, the actuator module of the EGR air mixing valve is arranged in a split mode, so that an actuator has better universality on different engine platforms; and the assembling cost of the EGR air mixing valve and the mixing pipe and the supply cost of an actuator are reduced.

Description

Technical Field

[0001] The utility model belongs to the field of EGR valves, and in particular relates to a separation type EGR air mixing valve. Background Art

[0002] Exhaust gas recirculation (EGR) technology is widely used in engines. It controls a certain mass of combustion exhaust gas into the intake pipe through the EGR valve and mixes it with fresh air before being reintroduced into the combustion chamber for combustion, thereby reducing nitrogen oxides in the exhaust gas and engine fuel consumption.

[0003] The EGR air mixing valve needs to be driven by an actuator to control opening and closing. In the existing technology, the EGR mixing valve and the mixing tube are generally assembled together through mounting components, and then an actuator is set on the mixing valve to control the opening degree of the valve plate. The assembly of the mixing valve and the mixing tube in this process increases the assembly process and occupies more space. In addition, the integrated setting of the actuator and the mixing valve leads to poor compatibility. The actuator lacks universality for different engine platforms, which increases the supply cost of the actuator. Utility Model Content

[0004] The purpose of the present utility model is to provide a separate EGR air mixing valve in order to solve the above problems.

[0005] The utility model achieves the above-mentioned purpose through the following technical solutions:

[0006] A separate EGR air mixing valve includes an EGR mixing tube and an actuator, wherein the EGR mixing tube includes a mixing tube body and a valve shaft radially extending from the mixing tube body, the actuator includes a shell and a driving component arranged in the shell, the mixing tube body and the shell are assembled and connected by a fixing part, and a matching part is also provided in the shell, which is dynamically connected to the driving component and used for dynamically docking with the valve shaft.

[0007] As a further optimization scheme of the present invention, the driving component includes a motor and a gear set for transmission. The mating part is a fan-shaped gear coaxially assembled with the valve shaft, and a return spring is provided on the outside of the fan-shaped gear. The fan-shaped gear is provided with a tendency to rotate in the direction of meshing of the gear set through the return spring.

[0008] As a further optimization scheme of the present invention, the gear set includes a primary gear arranged on the output shaft of the motor, and a secondary gear arranged in the housing and meshing with both the primary gear and the sector gear. The secondary gear has large and small gear plates, the large gear plate meshes with the primary gear, and the small gear plate meshes with the sector gear. By setting the large and small gear plates, a deceleration is formed to increase the torque of the motor.

[0009] As a further optimization scheme of the present invention, a limiting rib for limiting the rotation angle of the two ends of the sector gear is provided in the shell, and the reset spring is a torsion spring with outward extensions at both ends of the torsion spring. A convex rib for limiting the extension is provided in the shell and on the sector gear, wherein the two extensions are distributed on both sides of the convex rib, and the torsion spring is tightened when the two convex ribs move relative to each other in any direction, so that the sector gear has a tendency to rotate back when it rotates in the clockwise / counterclockwise direction until it is about to disengage from the gear set, thereby preventing complete disengagement.

[0010] As a further optimization scheme of the present invention, the sector gear shaft is provided with a magnet, and a sensor is also provided in the shell for monitoring the rotation angle of the sector gear. The angle of the valve shaft can be monitored in real time through the sensor and the magnet, so as to know the opening angle and monitor the stable operation of the actuator.

[0011] As a further optimization scheme of the present invention, a shaft sleeve is radially extended from the surface of the mixing tube body, a needle bearing matching the valve shaft is provided inside the shaft sleeve, and a sealing ring is provided outside the shaft sleeve to improve the sealing after assembly with the shell. This scheme facilitates the docking of the mixing tube body and the shell by providing the shaft sleeve.

[0012] As a further optimization solution of the present invention, a buckle is provided in the shaft sleeve, and the buckle corresponds to the annular groove provided on the surface of the valve shaft, and is used to limit the axial movement of the valve shaft.

[0013] As a further optimization scheme of the present invention, the shell is provided with a multi-stage docking part docked with the sleeve, which is used to compress the sealing ring on the outside of the sleeve. The multi-stage docking part has multiple coaxial holes with different diameters, and the surface of the sleeve is also correspondingly set to a coaxial structure with different diameters. They are inserted into each other and compressed, fixed and sealed by a first fixing bolt.

[0014] As a further optimization solution of the present invention, an upper cover is further provided on the shell, and the upper cover is mechanically covered with the shell.

[0015] As a further optimized solution of the present invention, the fixing portion includes a plurality of fixing bolts extending in at least two directions, wherein a fixing platform corresponding to the fixing bolts is provided on the mixing tube body.

[0016] The beneficial effects of the present invention are:

[0017] The utility model integrates the EGR mixing valve and the mixing pipe in the traditional technology, and on this basis further arranges the EGR air mixing valve actuator module in a split manner, so that the actuator has better versatility on different engine platforms, and reduces the assembly cost of the EGR air mixing valve and the mixing pipe and the supply cost of the actuator. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a schematic diagram of the overall structure of the utility model.

[0019] Figure 2 It is a schematic diagram of the cross-sectional structure of the present utility model.

[0020] Figure 3 This utility model Figure 2 Schematic diagram of the EGR mixing tube and actuator separation.

[0021] Figure 4 It is a three-dimensional view of the actuator of the present utility model.

[0022] Figure 5 This is a three-dimensional view of the EGR mixing tube of the utility model.

[0023] Figure 6 It is a schematic diagram of the shell of the present utility model.

[0024] Figure 7 It is a schematic diagram of the sector gear and the return spring of the utility model.

[0025] In the figure: 1. EGR mixing tube; 101. Mixing tube body; 102. Valve shaft; 103. Needle bearing; 104. Sliding bearing; 105. Valve plate; 106. Bolt; 107. First O-ring; 108. Second O-ring; 109. Buckle; 110. First fixing platform; 111. Cover plate; 112. Second fixing platform; 113. Annular groove; 2. Actuator; 201. Housing; 202. Upper cover; 203. Primary gear; 204. Secondary gear; 205. Fan gear; 206. Motor; 207. Secondary gear shaft; 208. Return spring; 209. Magnet; 210. Sensor; 3. First fixing bolt; 4. Second fixing bolt; 51. First limiting rib; 52. Second limiting rib; 53. First convex rib; 54. Second convex rib. DETAILED DESCRIPTION

[0026] The present application is described in further detail below in conjunction with the accompanying drawings. It is necessary to point out that the following specific implementation methods are only used to further illustrate the present application and cannot be understood as limiting the scope of protection of the present application. Technicians in this field can make some non-essential improvements and adjustments to the present application based on the above application content.

[0027] Example 1

[0028] like Figure 1-7As shown, a separate EGR air mixing valve includes an EGR mixing tube 1 and an actuator 2, wherein the EGR mixing tube 1 includes a mixing tube body 101 and a valve shaft 102 radially extending from the mixing tube body 101, and the actuator 2 includes a shell 201 and a driving component arranged in the shell 201. The mixing tube body 101 and the shell 201 are assembled and connected through a fixing part. A matching part is also provided in the shell 201, which is dynamically connected to the driving component and is used to dynamically dock with the valve shaft 102.

[0029] The driving component includes a motor 206 and a gear set for transmission. The mating part is a fan gear 205 coaxially assembled with the valve shaft 102, and a return spring 208 is provided on the outside of the fan gear 205. The fan gear 205 is provided with a tendency to rotate in the direction of engagement of the gear set through the return spring 208.

[0030] This solution increases torque by setting a gear set for speed reduction transmission, and sets a sector gear 205 for engagement. The angle of the sector gear 205 corresponds to the angle of the valve shaft 102. By driving the sector gear 205, the angle of the valve shaft 102 can be controlled.

[0031] Specifically, the return spring 208 is a torsion spring, and a first limiting rib 51 and a second limiting rib 52 are provided in the housing 201 for limiting the rotation angle of the two ends of the sector gear 205. The two ends of the torsion spring have extensions outward, and the housing 201 is further provided with a first convex rib 53 for limiting the extension, wherein the two extensions are distributed on both sides of the first convex rib 53, so that the extension can only move in the direction of the torsion spring force storage, and the sector gear 205 is provided with a second convex rib 54, which is parallel to the first convex rib 53 and is also provided between the two extensions, which is used to drive one extension to store energy when the sector gear 205 rotates clockwise and counterclockwise, such as Figure 7 As shown, taking this perspective as an example, when the sector gear 205 rotates to the right, the second rib 54 drives the upper extension part to rotate to the right to store energy, while the lower extension part is stuck by the first rib 53. Conversely, this structure allows the sector gear 205 to disengage from the gear set in any direction and has a tendency to return to meshing.

[0032] As an embodiment, the gear set includes a primary gear 203 provided on the output shaft of the motor 206, a secondary gear 204 provided in the housing 201 and meshing with the primary gear 203, the secondary gear 204 having a large and a small toothed disc, the large toothed disc meshing with the primary gear 203, the small toothed disc meshing with the sector gear 205, the radius of the primary gear 203 being smaller than the large toothed disc of the secondary gear 204, wherein the secondary gear 204 is provided on the housing 201 via the secondary gear shaft 207, and accordingly, as shown in FIG. Figure 2-3As shown, the sector gear 205 extends downwardly out of a cylindrical shaft portion, which is used to rotationally fix the sector gear 205 and the housing 201.

[0033] A magnet 209 is provided on the shaft of the sector gear 205, and a sensor 210 is also provided in the housing 201 for monitoring the rotation angle of the sector gear 205. The angle of the valve shaft 102 can be monitored in real time through the sensor 210 and the magnet 209, so as to know the opening angle and monitor the stable operation of the actuator 2.

[0034] As a more specific embodiment, a sleeve is radially extended from the surface of the mixing tube body 101, a needle bearing 103 matching the valve shaft 102 is provided inside the sleeve, and a sealing ring is provided outside the sleeve to improve the sealing performance after assembly with the housing 201.

[0035] A buckle 109 is provided in the shaft sleeve, which corresponds to the annular groove 113 provided on the surface of the valve shaft 102 and is used to limit the axial movement of the valve shaft 102 .

[0036] The housing 201 is provided with a multi-stage docking portion that docks with the sleeve, which is used to compress the sealing ring on the outside of the sleeve. The multi-stage docking portion has multiple coaxial holes with different diameters. The surface of the sleeve is also correspondingly set to a coaxial structure with different diameters. They are inserted into each other and compressed, fixed and sealed through the first fixing bolt 3. There are at least two sealing rings, namely the first O-ring 107 and the second O-ring 108, which are respectively arranged on the outer surface of the sleeve with different diameters.

[0037] The housing 201 is further provided with an upper cover 202 , which is mechanically covered with the housing 201 . The upper cover 202 and the housing 201 can be fixedly connected by a snap, a threaded structure or other mechanical means, and a sealing structure can also be provided.

[0038] The fixing portion includes a plurality of fixing bolts extending in at least two directions, wherein the mixing tube body 101 is provided with a fixing platform corresponding to the fixing bolts. Specifically, the shell 201 and the mixing tube body 101 are assembled and fixed by a first fixing bolt 3 and a second fixing bolt 4, wherein the mixing tube body 101 is provided with a plurality of second fixing platforms 112 parallel to the valve shaft 102 and a first fixing platform 110 parallel to the mixing tube body 101, the first fixing bolt 3 passes through the shell 201 and is threadedly connected to the second fixing platform 112, the second fixing bolt 4 passes through the shell 201 and is threadedly connected to the first fixing platform 110, and the first fixing bolt 3 can be a self-tapping screw.

[0039] In addition, a valve plate 105 is provided in the mixing tube body 101, and the valve plate 105 is fixed to the valve shaft 102 by bolts 106. The end of the valve shaft 102 away from the sector gear 205 is connected to the mixing tube body 101 through a sliding bearing 104. The mixing tube body 101 is provided with a housing corresponding to the sliding bearing 104, and the housing has a cover plate 111.

[0040] The above-described embodiments merely represent several implementation methods of the present invention. While the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the present invention. It should be noted that a person skilled in the art would be able to make numerous variations and improvements without departing from the scope of the present invention, all of which fall within the scope of protection of the present invention.

Claims

1. A separate EGR air mixing valve, comprising an EGR mixing pipe (1) and an actuator (2), characterized in that: The EGR mixing tube (1) comprises a mixing tube body (101) and a valve shaft (102) radially extending from the mixing tube body (101); the actuator (2) comprises a housing (201) and a driving component disposed in the housing (201); the mixing tube body (101) and the housing (201) are assembled and connected via a fixing portion; and a matching portion is further disposed in the housing (201) for power connection with the driving component and for power docking with the valve shaft (102).

2. A separate EGR air mixing valve according to claim 1, characterized in that: The driving component includes a motor (206) and a gear set for transmission. The matching part is a sector gear (205) coaxially assembled with the valve shaft (102), and a return spring (208) is provided on the outside of the sector gear (205).

3. The split EGR air mixing valve according to claim 2, characterized in that: The gear set comprises a primary gear (203) arranged on the output shaft of a motor (206), and a secondary gear (204) arranged in a housing (201) and meshing with both the primary gear (203) and the sector gear (205).

4. The split EGR air mixing valve according to claim 2, characterized in that: A limiting rib for limiting the rotation angle of the two ends of the sector gear (205) is provided in the housing (201); the reset spring (208) is a torsion spring having outwardly extending portions at both ends; convex ribs for limiting the extending portions are provided in the housing (201) and on the sector gear (205); wherein the two extending portions are distributed on both sides of the convex rib, and when the two convex ribs move relative to each other in any direction, the torsion spring is tightened.

5. The split type EGR air mixing valve according to claim 4, characterized in that: The shaft of the sector gear (205) is provided with a magnetic steel (209), and a sensor (210) is also provided in the housing (201) for monitoring the rotation angle of the sector gear (205).

6. The split type EGR air mixing valve according to claim 1, characterized in that: A shaft sleeve is radially extended from the surface of the mixing tube body (101), a needle bearing (103) matching the valve shaft (102) is arranged inside the shaft sleeve, and a sealing ring is arranged outside the shaft sleeve.

7. The split type EGR air mixing valve according to claim 6, characterized in that: A buckle (109) is provided in the shaft sleeve for limiting the axial movement of the valve shaft (102).

8. The split EGR air mixing valve according to claim 6, characterized in that: The housing (201) is provided with a multi-stage docking portion docked with the shaft sleeve, and is used to compress the sealing ring outside the shaft sleeve.

9. The split type EGR air mixing valve according to claim 1, characterized in that: The housing (201) is further provided with an upper cover (202), and the upper cover (202) and the housing (201) are mechanically covered.

10. The split type EGR air mixing valve according to claim 1, characterized in that: The fixing portion comprises a plurality of fixing bolts extending in at least two directions, wherein a fixing platform corresponding to the fixing bolts is provided on the mixing tube body (101).

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