Transmission mechanism of compact EGR (Exhaust Gas Recirculation) valve

Abstract

The utility model discloses a transmission mechanism of a compact EGR (Exhaust Gas Recirculation) valve, which comprises a shell of the EGR valve, and a track is arranged on the shell; a gear shaft is connected to the shell, and a duplicate gear is arranged on the gear shaft in a matched mode. A power motor is arranged on the shell, and a motor gear is connected to a motor shaft of the power motor and meshed with a large gear of the duplicate gear. A transverse rod shaft is installed on the shell, and a connecting transverse rod is connected to the transverse rod shaft. A second connecting rod is hinged to one end of the connecting cross rod, a target plate carrier is hinged to the other end of the second connecting rod, and a sensor target plate is installed on the target plate carrier; a first connecting rod is hinged to the other end of the connecting cross rod, and a rack is hinged to the other end of the first connecting rod; the bottom end face of the rack is connected with a center rod, and the other end of the center rod is connected with a valve plate. The EGR valve has the advantages of being small in size, simple in structure and low in cost, and a new thought is provided for designing the EGR valve with the smaller size.

Description

TECHNICAL FIELD

[0001] The utility model relates to EGR valve technical field more particularly to a compact EGR valve drive mechanism. BACKGROUND

[0002] The EGR valve in the engine exhaust gas recirculation system is mainly used for adjusting and controlling the flow of recirculated exhaust gas. The electric EGR valve controls the opening size of the air inlet through the internal DC motor, and the pneumatic EGR valve controls the vacuum degree through the vacuum regulator, thereby indirectly controlling the opening size of the EGR to adjust the exhaust gas flow, so that the exhaust gas and fresh air are mixed in a certain proportion and then returned to the cylinder for recirculation and combustion, so as to reduce the combustion temperature and speed in the cylinder, and further reduce the emission of NO X .

[0003] At present, with the updating of hybrid passenger car engine technology, the engine design is more and more compact, and the size of each part is more and more high. The EGR valve with small size and low price is more and more favored by engine customers because it is easier to arrange the engine air circuit.

[0004] In order to further reduce the size of the EGR valve, a compact EGR valve drive mechanism is needed. SUMMARY

[0005] The technical problem to be solved by the utility model is to provide a compact EGR valve drive mechanism to solve the problems in the background art.

[0006] To solve the above technical problems, the technical scheme adopted by the utility model is as follows.

[0007] A compact EGR valve drive mechanism, comprising a shell of an EGR valve, the shell is provided with a vertically arranged track; the shell is connected with a gear shaft, and the gear shaft is provided with a linked double gear; the shell is provided with a power motor, the motor shaft of the power motor is connected with a motor gear, and the motor gear is engaged with the large gear of the double gear; the shell is installed with a cross rod shaft, the cross rod shaft is connected with a connecting cross rod; one end of the connecting cross rod is hinged with a second connecting rod, the other end of the second connecting rod is hinged with a target plate carrier which can move up and down along the track, and the target plate carrier is installed with a sensor target plate; the other end of the connecting cross rod is hinged with a first connecting rod, the other end of the first connecting rod is hinged with a rack which is engaged with the small gear of the double gear; the bottom end surface of the rack is connected with a center rod, and the other end of the center rod is connected with a valve plate for controlling the flow of the EGR valve.

[0008] Further optimize the technical scheme, the connecting cross rod and the second connecting rod, the second connecting rod and the target plate carrier are connected through the connecting shaft and the bearing.

[0009] Further optimization technical scheme, the connecting cross rod and the first connecting rod, the first connecting rod and the rack are connected through connecting shaft and bearing.

[0010] Further optimization technical scheme, the sensor target plate is metal sheet or magnetic steel.

[0011] Further optimization technical scheme, the position of the cross rod shaft is higher than the position of the gear shaft.

[0012] Due to the adoption of the above technical scheme, the technical progress achieved by the utility model is as follows.

[0013] The transmission mechanism of the compact EGR valve converts motor force into the center rod through gear, connecting cross rod, connecting rod and rack, drives the up and down displacement movement of the valve piece, and converts the movement direction of the valve piece into the movement of the sensor target plate. BRIEF DESCRIPTION OF DRAWINGS

[0014] Fig. 1 It is a structural schematic view of the utility model;

[0015] Fig. 2 It is a state schematic view of the utility model when working;

[0016] Among them: 1, gear shaft, 2, double gear, 3, power motor, 4, motor gear, 5, valve piece, 6, center rod, 7, rack, 8, target plate carrier, 9, sensor target plate, 10, connecting cross rod, 11, cross rod shaft, 12, first connecting rod, 13, second connecting rod. DETAILED DESCRIPTION

[0017] The utility model will be further explained in detail in combination with the drawings and specific embodiment.

[0018] The transmission mechanism of the compact EGR valve, in combination Figs. 1-2 As shown in the figure, it includes gear shaft 1, double gear 2, power motor 3, motor gear 4, valve piece 4, center rod 6, rack 7, target plate carrier 8, sensor target plate 9, connecting cross rod 10, cross rod shaft 11, first connecting rod 12, second connecting rod 13.

[0019] The EGR valve includes a shell, and the shell is provided with a vertically arranged track.

[0020] The gear shaft 1 is connected to the shell, and a double gear 2 is arranged on the gear shaft 1, and the gear shaft 1 serves to fix the double gear 2; the double gear 2 comprises a large gear and a small gear in synchronous linkage, and serves to transmit torque and change rotation speed.

[0021] A power motor 3 is arranged on the shell, the power motor 3 is a power source of the EGR valve, and the power motor 3 is a bidirectional motor. A motor gear 4 is connected to a motor shaft of the power motor 3, and the motor gear is engaged with the large gear of the double gear 2.

[0022] A cross rod shaft 11 is mounted on the shell, and the position of the cross rod shaft 11 is higher than that of the gear shaft 1. A connecting cross rod 10 is connected to the cross rod shaft 11, one end of the connecting cross rod 10 is hingedly connected to a second connecting rod 13, the other end of the second connecting rod 13 is hingedly connected to a target plate carrier 8, and the target plate carrier 8 can move up and down along a track. A sensor target plate 9 is mounted on the target plate carrier 8, and the sensor target plate 9 serves as a detection target for displacement of the valve piece 4. The sensor target plate 9 can be a metal sheet, a magnetic steel or other material components.

[0023] The other end of the connecting cross rod 10 is hingedly connected to a first connecting rod 12, and the other end of the first connecting rod 12 is hingedly connected to a rack 7 engaged with the small gear of the double gear 2.

[0024] The connecting cross rod 10 and the second connecting rod 13, and the second connecting rod 13 and the target plate carrier 8 are connected through connecting shafts and bearings.

[0025] The connecting cross rod 10 and the first connecting rod 12, and the first connecting rod 12 and the rack 7 are connected through connecting shafts and bearings.

[0026] The bottom end surface of the rack 7 is connected to a center rod 6, and the other end of the center rod 6 is connected to a valve piece 4 for controlling the flow of the EGR valve.

[0027] In actual use, when the valve piece 4 needs to move downward, the gear of the power motor 3 is controlled to move clockwise, so that the double gear 2 rotates counterclockwise, and then drives the engaged rack 7 to move downward, that is, the valve piece 4 is driven to move downward through the center rod 6, so as to achieve the target action of moving the valve piece 4 downward. During the downward movement of the rack 7, the connecting cross rod 10 is made to rotate counterclockwise around the cross rod shaft 11 through the first connecting rod 12; the other end of the connecting cross rod 10 drives the target plate carrier 8 and the sensor target plate 9 to move upward through the second connecting rod 13. That is, when the valve piece 4 moves downward in a straight line, the sensor target plate moves upward on the other side of the double gear. Similarly, when the valve piece moves upward in a straight line, the sensor target plate moves downward on the other side of the double gear. The upward and downward displacement of the valve piece is converted into the upward and downward displacement of the sensor target plate through the above-mentioned connecting structure, the design height of the product is reduced, and the size of the product is further compressed.

Claims

1. A transmission mechanism for a compact EGR valve, characterized in that: The system includes a housing for an EGR valve, on which a vertically mounted track is provided; a gear shaft (1) is connected to the housing, and a double gear (2) is mounted on the gear shaft (1); a power motor (3) is mounted on the housing, and a motor gear is connected to the motor shaft of the power motor (3), and the motor gear meshes with the large gear of the double gear (2); a crossbar shaft (11) is mounted on the housing, and a connecting crossbar (10) is connected to the crossbar shaft (11); a second connecting rod is hinged to one end of the connecting crossbar (10). (13) The other end of the second link (13) is hinged to a target plate carrier (8) that can move up and down along the track. A sensor target plate (9) is installed on the target plate carrier (8). The other end of the connecting crossbar (10) is hinged to a first link (12). The other end of the first link (12) is hinged to a rack (7) that meshes with the small gear in the double gear (2). The bottom end of the rack (7) is connected to a central rod (6). The other end of the central rod (6) is connected to a valve plate (4) for controlling the flow of the EGR valve.

2. The transmission mechanism of a compact EGR valve according to claim 1, characterized in that: The connecting crossbar (10) and the second connecting rod (13), and the second connecting rod (13) and the target plate carrier (8) are connected by connecting shafts and bearings.

3. The transmission mechanism of a compact EGR valve according to claim 2, characterized in that: The connecting crossbar (10) and the first connecting rod (12), and the first connecting rod (12) and the rack (7) are connected by connecting shafts and bearings.

4. The transmission mechanism of a compact EGR valve according to claim 3, characterized in that: The sensor target plate (9) is a metal sheet or a magnet.

5. The transmission mechanism of a compact EGR valve according to claim 4, characterized in that: The position of the crossbar shaft (11) is higher than the position of the gear shaft (1).

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