Reduction cam transmission exhaust gas recirculation valve

Abstract

The utility model belongs to the field of engine emission control, and provides a deceleration cam transmission exhaust gas recirculation valve which comprises a valve body, a valve rod, a support, a roller and a deflector rod. Wherein an air inlet port is formed in the valve body; the tail end of the valve rod is connected with a sealing disc used for sealing the air inlet port. The support forms an annular side wall which surrounds the periphery of the valve rod and is coaxial with the valve rod, and cam grooves are formed in the two opposite sides of the annular side wall respectively. The rolling wheels are movably installed in the cam grooves in the two sides and guided by the cam grooves, the rolling wheels on the two sides are rotationally installed on sliding blocks coaxial with the rolling wheels respectively, and the valve rod is connected to the sliding blocks; the shifting rod is parallel to the valve rod and can rotate around the central axis of the valve rod in a reciprocating mode, and the sliding block is connected to the shifting rod in a sliding mode and can move in the axial direction of the shifting rod.

Description

Technical Field

[0001] The present application belongs to the field of engine emission control, and more specifically, to a deceleration cam driven exhaust gas recirculation valve. Background Art

[0002] As an advanced environmental protection technology, the exhaust gas recirculation valve (EGR valve) has been widely used in the automotive industry in recent years. This technology aims to effectively reduce harmful emissions in automobile exhaust by accurately controlling the exhaust gas recirculation process, thereby meeting increasingly stringent environmental protection regulations. In actual operation, the EGR valve can adjust the exhaust gas recirculation volume in real time according to the engine's operating status and exhaust emissions. When the engine is under high load or high temperature, the EGR valve will appropriately reduce the opening to reduce the exhaust gas recirculation volume to prevent the engine from overheating or performance degradation. Under low load or low temperature conditions, the EGR valve will increase the opening to increase the exhaust gas recirculation volume, thereby reducing the nitrogen oxide content in the exhaust gas. However, the traditional EGR valve is prone to poor intake port sealing during operation, which affects the stability and reliability of the exhaust gas recirculation process. Therefore, it is necessary to solve the above technical problems. Summary of the invention

[0003] The purpose of the embodiments of the present application is to provide a deceleration cam driven exhaust gas recirculation valve to solve the technical problem of poor sealing effect of the exhaust gas recirculation valve existing in the prior art.

[0004] In order to achieve the above-mentioned purpose, the technical solution adopted in the present application is: to provide a deceleration cam driven exhaust gas recirculation valve, comprising:

[0005] a valve body forming an inlet port and an exhaust port;

[0006] a valve stem, the end of which is connected to a sealing disk for closing the air inlet port;

[0007] A bracket, forming an annular side wall surrounding the valve stem and coaxial with the valve stem, wherein opposite sides of the annular side wall are respectively provided with cam grooves, and the cam grooves extend in the axial direction and circumferential direction of the annular side wall;

[0008] Rollers are movably mounted in the cam grooves on both sides and guided by the cam grooves. The rollers on both sides are rotatably mounted on sliding blocks coaxial with the rollers, and the valve stem is connected to the sliding blocks.

[0009] The lever is parallel to the valve stem and can reciprocate around the center axis of the valve stem. The sliding block is slidably connected to the lever and can move along the axial direction of the lever.

[0010] Optionally, a fixed shaft is connected to the top of the bracket, and an arc-shaped hole is provided for the lever to pass through;

[0011] Two arc-shaped holes are symmetrically arranged about the fixed axis, and two shifting rods are correspondingly arranged and pass through the two arc-shaped holes respectively.

[0012] Optionally, the deceleration cam driven exhaust gas recirculation valve further comprises a motor and a rotating member connected to the shifting rod, and the rotating member is slewingly supported by the fixed shaft;

[0013] The power end of the motor is connected to a reduction gear set and forms a gear pair with the rotating member through the reduction gear set.

[0014] Optionally, the rotating member has a sector gear portion drivingly connected to the reduction gear set.

[0015] Optionally, the top of the rotating member is further provided with magnets, magnetic conductive blocks and magnetic leakage holes arranged at intervals, and the interior of the valve body is further provided with a Hall sensor spaced opposite to the rotating member.

[0016] Optionally, the deceleration cam driven exhaust gas recirculation valve further comprises a torsion spring abutting between the rotating member and the valve body.

[0017] Optionally, a first installation cavity for installing the motor and a second installation cavity for installing the bracket are preset on the valve body.

[0018] Optionally, the reduction gear set includes a reduction gear shaft, and a mounting hole for mounting the reduction gear shaft is preset in the valve body.

[0019] Optionally, the deceleration cam driven exhaust gas recirculation valve further comprises a cover body detachably connected to the valve body and capable of opening the first installation cavity and the second installation cavity.

[0020] Optionally, the deceleration cam driven exhaust gas recirculation valve further comprises a shaft sleeve mounted inside the valve body, and the shaft sleeve is coaxially sleeved on the valve stem.

[0021] The beneficial effect of the deceleration cam driven exhaust gas recirculation valve provided by the present application is that: compared with the prior art, in the deceleration cam driven exhaust gas recirculation valve provided by the present application, the sealing disk for controlling the opening or closing of the air intake port of the valve body is connected to the valve stem, and the bracket forms an annular side wall surrounding the valve stem and coaxial with the valve stem. When the roller rolls in the cam groove set on the annular side wall, the valve stem can be driven to stably reciprocate along its own axis under the guidance of the cam groove, thereby controlling the opening of the air intake port of the valve body. In the present application, since the cam groove can provide continuous guidance for the movement of the roller, the movement of the valve stem can have a stability far superior to that of the prior art, which can not only improve the response speed of the exhaust gas recirculation valve in the present application, but also effectively improve the sealing effect of the exhaust gas recirculation valve in the present application and ensure the stability and reliability of the exhaust gas recirculation process, which is far superior to the prior art. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative labor.

[0023] Figure 1 A schematic diagram of the explosion structure of a deceleration cam driven exhaust gas recirculation valve provided in an embodiment of the present application;

[0024] Figure 2 A schematic diagram of the top view of the exhaust gas recirculation valve driven by a deceleration cam provided in an embodiment of the present application;

[0025] Figure 3 For along Figure 2 The cross-sectional structure diagram along the AA line;

[0026] Figure 4 A schematic diagram of a portion of the structure of a deceleration cam driven exhaust gas recirculation valve provided in an embodiment of the present application;

[0027] Figure 5 Schematic diagram of the support structure of the deceleration cam driven exhaust gas recirculation valve provided in an embodiment of the present application.

[0028] Among them, the figure marks in the figure are: 101, valve body; 102, air inlet port; 103, valve stem; 104, sealing disk; 105, bracket; 106, cam groove; 107, roller; 108, sliding block; 109, lever; 110, fixed axis; 111, arc hole; 112, motor; 113, rotating part; 114, reduction gear set; 115, fan-shaped gear part; 116, magnet; 117, magnetic guide block; 118, magnetic leakage hole; 119, Hall sensor; 120, torsion spring; 121, first installation cavity; 122, second installation cavity; 123, reduction gear shaft; 124, installation hole; 125, cover body; 126, bushing; 127, exhaust port. DETAILED DESCRIPTION

[0029] In order to make the technical problems, technical solutions and beneficial effects to be solved by the present application more clearly understood, the present application is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present application and are not used to limit the present application.

[0030] It should be noted that when an element is referred to as being "fixed to" or "disposed on" another element, it can be directly on the other element or indirectly on the other element. When an element is referred to as being "connected to" another element, it can be directly connected to the other element or indirectly connected to the other element.

[0031] It should be understood that the terms "length", "width", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc., indicating the orientation or position relationship, are based on the orientation or position relationship shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present application.

[0032] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of the features. In the description of this application, the meaning of "plurality" is two or more, unless otherwise clearly and specifically defined.

[0033] Please also read Figures 1 to 5 Now, a deceleration cam driven exhaust gas recirculation valve provided in an embodiment of the present application is described. The deceleration cam driven exhaust gas recirculation valve comprises a valve body 101, a valve stem 103, a bracket 105, a roller 107 and a lever 109. Among them:

[0034] The valve body 101 forms an air inlet port 102 and an air outlet port 127, and a sealing disk 104 for closing the air inlet port 102 is connected to the end of the valve stem 103. The bracket 105 forms an annular side wall surrounding the valve stem 103 and coaxial with the valve stem 103, and cam grooves 106 are respectively provided on opposite sides of the annular side wall, and the cam grooves 106 extend along the axial direction and circumferential direction of the annular side wall. The rollers 107 are movably installed in the cam grooves 106 on both sides and guided by the cam grooves 106. The rollers 107 on both sides are rotatably installed on the sliding blocks 108 coaxial with the rollers 107, and the valve stem 103 is connected to the sliding blocks 108. The lever 109 is parallel to the valve stem 103 and can reciprocate around the central axis of the valve stem 103. The sliding block 108 is slidably connected to the lever 109 and can move axially along the lever 109. Here, it can be understood that the intake port 102 is connected to the exhaust port of the engine, and the exhaust port 127 is connected to the intake end of the engine to achieve the recovery and reuse of the exhaust gas.

[0035] According to the above structure provided in this embodiment, when the lever 109 parallel to the valve stem 103 rotates around the valve stem 103, the sliding block 108 slidably connected to the lever 109 can be driven to rotate around the valve stem 103. Since rollers 107 are also connected to both ends of the sliding block 108 and the rollers 107 are arranged in the cam groove 106 on the annular side wall, and since the cam groove 106 extends along the axial direction and circumferential direction of the annular side wall, the rollers 107 can move around the circumferential direction of the annular side wall in the cam groove 106 driven by the sliding block 108 and move along the axial direction of the valve stem 103 under the guidance of the cam groove 106, so that the rollers 107 can drive the sliding block 108 to move along the axial direction of the lever 109 and drive the valve stem 103 to move along its own axial direction, thereby controlling the opening of the air inlet port 102 of the valve body 101. In this embodiment, since the cam groove 106 can provide continuous guidance for the movement of the roller 107, the movement of the valve stem 103 can have a stability far superior to that of the prior art, which not only improves the response speed of the exhaust gas recirculation valve in this application, but also effectively improves the sealing effect of the exhaust gas recirculation valve in this application and ensures the stability and reliability of the exhaust gas recirculation process, which is far superior to the prior art.

[0036] In another embodiment of the present application, please refer to Figures 1 to 5The top of the bracket 105 is connected with a fixed shaft 110, and is also provided with an arc hole 111 for the lever 109 to pass through. Here, it can be understood that the fixed shaft 110 and the arc hole 111 are coaxial, and the fixed shaft 110 is usually an integral structure with the annular side wall of the bracket 105. The bracket 105 can be made of steel material through mechanical processing, or can be an injection molded part formed by injection molding. Two arc holes 111 are symmetrically arranged about the fixed shaft 110, and the lever 109 is correspondingly provided with two and passes through the two arc holes 111 respectively. The effective arc lengths of the two arc holes 111 are both adapted to the arc lengths of the rotation tracks of the corresponding lever 109 therein. At the same time, it can be understood that the extension length of the arc hole 111 arranged on the bracket 105 in this embodiment is adapted to the length of the cam groove 106 along the circumferential direction of the annular side wall, so that the lever 109 can move smoothly and drive the roller 107 to move to the two ends of the cam groove 106. According to the above structure provided in this embodiment, the fixed shaft 110 provided at the top of the bracket 105 can be used to form a stable slewing support for the rotating member 103. By providing two arc-shaped holes 111 on the bracket 105, the lever 109 can pass through the end surface of the bracket 105 and extend into the interior of the bracket 105, and the sliding block 108 can be arranged inside the bracket 105, which is conducive to reducing the volume of the exhaust gas recirculation valve in this embodiment and has the effect of making the entire product compact. In addition, in this embodiment, the two levers 109 drive the sliding block 108 to rotate, which can improve the rotation stability of the sliding block 108.

[0037] In another embodiment of the present application, please refer to Figures 1 to 5 The present deceleration cam driven exhaust gas recirculation valve further comprises a motor 112 and a rotating member 113 connected to the lever 109, wherein the rotating member 113 is slewingly supported by the fixed shaft 110, and the power end of the motor 112 is connected to a reduction gear set 114 and forms a gear pair with the rotating member 113 through the reduction gear set 114. According to the above structure provided in the present embodiment, the motor 112 drives the rotating member 113 to rotate through the reduction gear set 114, which can drive the lever 109 connected to the rotating member 113 to rotate. Since the output end of the motor 112 is provided with the reduction gear set 114, the opening and closing of the intake port 102 can be controlled with a relatively small current, thereby achieving the technical effect of energy saving and emission reduction. In the present embodiment, it is preferred to fix the upper end of the lever 109 in the entity of the rotating member 113 by injection molding to form a firm connection.

[0038] In another embodiment of the present application, please refer to Figures 1 to 5The rotating member 113 has a sector gear portion 115 that is transmission-connected to the reduction gear set 114. According to the above structure provided in this embodiment, the sector gear portion 115 provided on the rotating member 113 can not only stably mesh with the reduction gear set 114 provided on the motor 112 to achieve a transmission effect, but also has a technical effect of reducing the weight of the rotating member 113.

[0039] In another embodiment of the present application, please refer to Figures 1 to 5 , the top of the rotating member 113 also has magnets 116, magnetic blocks 117 and magnetic leakage holes 118 arranged at intervals, and the valve body 101 also has a Hall sensor 119 spaced opposite to the rotating member 113. According to the above technical effects provided in this embodiment, the Hall sensor 119 can cooperate with the magnets 116, magnetic blocks 117 and magnetic leakage holes 118 provided on the rotating member 113 to detect the rotation position of the rotating member 113, so as to feed back the position information of the rotating member 113 to the user, so that the user can accurately obtain the opening and closing information or the opening size information of the air inlet port 102.

[0040] In another embodiment of the present application, please refer to Figures 1 to 5 The reduction cam driven exhaust gas recirculation valve further includes a torsion spring 120 abutting between the rotating member and the valve body 101. According to the above structure provided in this embodiment, the torsion spring 120 abutting between the rotating member and the valve body 101 can make the rotating member always tightly fit against the reduction gear set 114, so that the rotating member 113 can move more stably under the drive of the motor 112.

[0041] In another embodiment of the present application, please refer to Figures 1 to 5 The valve body 101 is pre-set with a first installation cavity 121 for installing the motor 112 and a second installation cavity 122 for installing the bracket 105. According to the above structure provided in this embodiment, the first installation cavity 121 and the second installation cavity 122 can improve the installation efficiency of the motor 112 or the bracket 105, and also help to keep the motor 112 and the bracket 105 in a stable relative position relationship, so that the two have a more stable transmission connection relationship.

[0042] In another embodiment of the present application, please refer to Figures 1 to 5 The reduction gear set 114 includes a reduction gear shaft 123, and a mounting hole 124 for mounting the reduction gear shaft 123 is preset in the valve body 101. According to the above structure provided in this embodiment, the mounting hole 124 can improve the installation stability of the reduction gear shaft 123, which is conducive to further stabilizing the transmission relationship between the motor 112 and the rotating member 113.

[0043] In another embodiment of the present application, please refer to Figures 1 to 5The deceleration cam driven exhaust gas recirculation valve further includes a cover 125 detachably connected to the valve body 101 and capable of opening the first installation cavity 121 and the second installation cavity 122. According to the above structure provided in this embodiment, by providing the cover 125 detachably connected to the valve body 101, it is not only convenient to process the internal structure of the valve body 101 and install the motor 112 and other structures, but also has a good use effect due to the cleaning and maintenance of the internal structure of the valve body 101 in the later stage. As a further preferred embodiment, the Hall sensor 119 is usually installed on the inner side of the cover 125 to simplify the structure of the valve body 101.

[0044] In another embodiment of the present application, please refer to Figures 1 to 5 The reduction cam driven exhaust gas recirculation valve further includes a sleeve 126 installed inside the valve body 101, and the sleeve 126 and the shaft sleeve 126 are arranged on the valve stem 103. According to the above structure provided in this embodiment, the sleeve 126 is conducive to further improving the movement stability of the valve stem 103.

[0045] The above description is only a preferred embodiment of the present application and is not intended to limit the present application. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present application should be included in the protection scope of the present application.

Claims

1. A deceleration cam driven exhaust gas recirculation valve, characterized in that: include: A valve body (101) forming an intake port (102) and an exhaust port (127); A valve stem (103), the end of which is connected to a sealing disk (104) for sealing the air inlet port (102); A bracket (105) is formed to form an annular side wall surrounding the valve stem (103) and coaxial with the valve stem (103), cam grooves (106) are respectively provided on opposite sides of the annular side wall, and the cam grooves (106) extend in the axial direction and the circumferential direction of the annular side wall; Rollers (107) are movably mounted in the cam grooves (106) on both sides and guided by the cam grooves (106); the rollers (107) on both sides are rotatably mounted on sliding blocks (108) coaxial with the rollers (107); and the valve stem (103) is connected to the sliding blocks (108); The shift rod (109) is parallel to the valve stem (103) and can reciprocate around the central axis of the valve stem (103); the sliding block (108) is slidably connected to the shift rod (109) and can move along the axial direction of the shift rod (109).

2. The deceleration cam driven exhaust gas recirculation valve according to claim 1, characterized in that: The top of the bracket (105) is connected to a fixed shaft (110) and is also provided with an arc-shaped hole (111) for the lever (109) to pass through; Two arc-shaped holes (111) are symmetrically arranged about the fixed axis (110), and two shifting rods (109) are correspondingly arranged and pass through the two arc-shaped holes (111) respectively.

3. The deceleration cam driven exhaust gas recirculation valve according to claim 2, characterized in that: The deceleration cam driven exhaust gas recirculation valve further comprises a motor (112) and a rotating member (113) connected to the shifting rod (109), wherein the rotating member (113) is slewingly supported by the fixed shaft (110); The power end of the motor (112) is connected to a reduction gear set (114) and forms a gear pair with the rotating member (113) through the reduction gear set (114).

4. The deceleration cam driven exhaust gas recirculation valve according to claim 3, characterized in that: The rotating member (113) has a sector gear portion (115) which is transmission-connected to the reduction gear set (114).

5. The deceleration cam driven exhaust gas recirculation valve according to claim 3, characterized in that: The top of the rotating member (113) is also provided with magnets (116), magnetic conductive blocks (117) and magnetic leakage holes (118) arranged at intervals, and the interior of the valve body (101) is also provided with a Hall sensor (119) spaced opposite to the rotating member (113).

6. The deceleration cam driven exhaust gas recirculation valve according to claim 3, characterized in that: The deceleration cam driven exhaust gas recirculation valve further comprises a torsion spring (120) abutting between the rotating member and the valve body (101).

7. The deceleration cam driven exhaust gas recirculation valve according to claim 3, characterized in that: The valve body (101) is preset with a first installation cavity (121) for installing the motor (112) and a second installation cavity (122) for installing the bracket (105).

8. The deceleration cam driven exhaust gas recirculation valve according to claim 7, characterized in that: The reduction gear set (114) comprises a reduction gear shaft (123), and a mounting hole (124) for mounting the reduction gear shaft (123) is preset in the valve body (101).

9. The deceleration cam driven exhaust gas recirculation valve according to claim 7, characterized in that: The deceleration cam driven exhaust gas recirculation valve further comprises a cover body (125) which is detachably connected to the valve body (101) and is capable of opening the first installation cavity (121) and the second installation cavity (122).

10. The deceleration cam driven exhaust gas recirculation valve according to claim 1, characterized in that: The deceleration cam driven exhaust gas recirculation valve further comprises a shaft sleeve (126) mounted inside the valve body (101), and the shaft sleeve (126) and the shaft sleeve (126) are arranged on the valve stem (103).

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