Movable connecting structure for output shaft and valve rod of motor

Abstract

The utility model provides a movable connecting structure for an output shaft and a valve rod of a motor, which comprises a hollow shaft connected with a rotor assembly. The upper section of the output shaft is in threaded fit with an inner cavity of the hollow shaft to achieve axial movement, and a T-shaped groove is formed in the lower end of the output shaft; a T-shaped block matched with the T-shaped groove is arranged at the upper end of the valve rod, and the lower end of the valve rod is connected with the valve plate; the dustproof sleeve sleeves the lower part of the output shaft; and the spring sleeves the valve rod, and the other end of the spring is connected with the valve body shell. According to the utility model, the output shaft linearly displaces and then the valve rod axially moves, so that the output shaft and the valve rod are connected into a movable whole, the real-time position of the valve plate and the position sensor are always kept synchronous during working, working condition data are fed back to an ECU (Electronic Control Unit) in real time, and the valve has the advantages of high reaction speed and good connectivity.

Description

TECHNICAL FIELD

[0001] The utility model belongs to diesel engine EGR technical field, specifically is a kind of movable connection structure of output shaft and valve rod of motor. BACKGROUND

[0002] Traditional EGR valve actuator generally includes brush holder assembly, tail cover assembly, stator assembly, rotor assembly, output shaft, guide end cover and so on, by the rotation of rotor assembly, the linear displacement movement of the output shaft of motor is carried out, and then the output shaft acts on valve rod, to realize the opening and closing of valve plate.

[0003] In prior art, the contact between the valve rod of valve body assembly and the output shaft of EGR valve actuator is split type, and there is gap between the two, which causes that the exhaust gas flow of valve body cannot be fed back to position sensor in real time during work, and time difference and feedback error and other phenomena are caused, and then carbon deposition in valve rod during long time work causes jamming, in addition, motor cannot work reversely to close valve plate.

[0004] In prior art, the hollow shaft end in rotor assembly adopts welding disc laser welding process and guide end cover ultrasonic welding process, and the process is relatively complicated, and the cost is high. UTILITY MODEL CONTENTS

[0005] The utility model provides a kind of movable connection structure of output shaft and valve rod of motor, it is by the linear displacement of output shaft and then the axial movement of valve rod, make it connect into an movable whole, the real-time position of valve plate during work and position sensor always keep synchronous, real-time feedback ECU working condition data, with the advantages of fast reaction speed, good connectivity.

[0006] The utility model provides a kind of movable connection structure of output shaft and valve rod of motor, for the opening and closing of EGR valve, including hollow shaft, the hollow shaft connects rotor assembly;Output shaft, the inner cavity thread cooperation of output shaft upper segment and the hollow shaft realizes axial movement, the T-shaped groove is set to the output shaft lower end;Valve rod, the T-shaped block that the T-shaped groove is cooperated with is set to the valve rod upper end, the valve rod lower end connects valve plate;Dust cover, the dust cover is connected and set in the output shaft lower part;Spring, the spring is set on valve rod and another end connects valve body shell.

[0007] The contact between the valve rod of valve body assembly and the output shaft of EGR valve actuator in the utility model is split type, convenient to disassemble, adopt the structure of T-shaped groove cooperates T-shaped block, greatly reduce the cooperation gap of two, the exhaust gas flow of valve body during work can be fed back to position sensor in real time, eliminate time difference, control more accurate, and avoid the phenomenon that carbon deposition in cooperation gap causes jamming.

[0008] Preferably, the utility model still includes and the big ball bearing of hollow shaft lower extreme connection, the hollow shaft lower part terminal is outwardly provided with the flanging of radial, the flanging upper surface and the big ball bearing lower extreme abuts. Flanging is used for better positioning and support to big ball bearing, the movement of output shaft and hollow shaft is more stable, control precision is higher. Adopt the flanging structure, has replaced the process that the welding disc adopts laser welding in the bottom of hollow shaft in prior art, the structure is simpler, greatly reduces the cost.

[0009] Preferably, the output shaft upper section is provided with a threaded section, the output shaft lower section is provided as a connecting section, the connecting section is configured as a plane on both sides, and the T-shaped slot vertically penetrates the plane. The connecting section structure is simpler and lighter in weight, and the plane is convenient for machining the T-shaped slot and positioning and installing the T-shaped block.

[0010] Preferably, the utility model further includes a guide end cover, the guide end cover is sleeved on the output shaft, and the guide end cover is arranged above the dustproof sleeve. The guide end cover is used for positioning and guiding the output shaft, the actuator works more stably, and the control precision is high.

[0011] Preferably, the utility model further includes a valve rod sealing ring arranged between the valve rod and the valve body shell. The valve rod upper part is sealed, and the service life of the EGR valve is improved.

[0012] Specifically, the axial dimension of the cavity of the T-shaped slot is 1.05-1.1 times the axial dimension of the head of the T-shaped block. The size makes the T-shaped slot and the T-shaped block be clearance fit, which ensures the convenience of installation and reduces the axial clearance as much as possible, and improves the control precision.

[0013] Specifically, the utility model further includes a big ball bearing connected with the lower end of the hollow shaft, and the diameter of the flange outwardly arranged radially at the lower end of the hollow shaft is 1.2-1.3 times the outer diameter of the hollow shaft. The installation stability of the bearing is ensured, and the installation difficulty is reduced.

[0014] Compared with the prior art, the utility model has the following beneficial effects:

[0015] The utility model discloses a linear displacement of output shaft and then the axial movement of valve rod, so that they are connected into a movable whole, the real-time position of valve piece is always kept synchronous with the position sensor in work, and the working condition data are fed back to ECU in real time, so that the utility model has the characteristics of fast response speed and good connectivity.

[0016] The utility model adopts the flange structure of the hollow shaft, cancels the laser welding process of the welding disc and the ultrasonic welding process of the guide end cover, optimizes the complicated production process, and reduces the cost. BRIEF DESCRIPTION OF DRAWINGS

[0017] Figure 1It is the whole structure schematic diagram of the output shaft and valve rod movable connection structure of the motor.

[0018] Figure 2 It is Figure 1 The enlarged view at A in the middle.

[0019] Figure 3 It is Figure 2 The left view.

[0020] Figure 4 It is the three-dimensional view of the output shaft and valve rod connection structure in the utility model.

[0021] Figure 5 It is the installation structure diagram of the hollow shaft.

[0022] Figure 6 It is the output shaft and valve rod connection structure diagram in the prior art.

[0023] In the drawing: 1-hollow shaft, 101-flanging, 2-rotor assembly, 3-output shaft, 301-T-shaped groove, 4-valve rod, 401-T-shaped block, 5-valve piece, 6-dust cover, 7-spring, 8-valve body shell, valve rod seal 9-ring, 10-welding disc, 11-large ball bearing, 12-stator assembly, 13-brush holder assembly, 14-tail cover assembly, 15-guiding end cover. DETAILED DESCRIPTION

[0024] The utility model will be further described below in combination with the drawings and specific embodiments, the schematic embodiment of the utility model and its explanation are used to explain the utility model, and do not constitute improper limitation to the utility model.

[0025] In the description of the utility model, it is understood that the orientation or position relationship indicated by the terms "left", "right", "up", "down", "front", "back" and the like is based on the orientation or position relationship shown in the drawing, and is only for the convenience of describing the utility model and simplifying the description, and does not indicate or imply that the indicated device or structure must have a particular orientation, a particular orientation and operation, therefore, it can not be understood as the limitation of the utility model.

[0026] Embodiment 1:

[0027] As Figure 1 Shown, an output shaft and valve rod movable connection structure of motor is used for driving the opening and closing of the valve piece 5 of EGR valve, including hollow shaft 1, the hollow shaft 1 is connected rotor assembly 2, output shaft 3, the inner cavity of the upper segment of the output shaft 3 and the hollow shaft 1 is threaded cooperation and realizes axial movement.

[0028] As Figure 2 And Figure 3As shown, the lower end of the output shaft 3 is provided with a T-shaped slot 301; the valve rod 4 is provided with a T-shaped block 401 at the upper end, and the lower end of the valve rod 4 is connected to the valve plate 5;

[0029] As shown in the drawings, Figure 1 As shown, the embodiment also includes a dust cover 6, which is sleeved on the lower end of the output shaft 3, and is used for protecting the output shaft 3; the spring 7 is sleeved on the valve rod 4 and connected to the valve body shell 8 at the other end, and the spring 7 is used for resetting the valve rod 4.

[0030] As shown in the drawings, Figure 1 The working principle of the embodiment is as follows: through the rotation of the rotor assembly, the linear displacement movement of the output shaft 3 driven by the rotation of the hollow shaft 1 of the motor, the opening and closing of the valve plate 5 are realized through the cooperation and connection of the T-shaped slot 301 and the T-shaped block 401; the valve rod 4 of the valve body assembly is in contact with the output shaft 3 of the EGR valve actuator in a split type, and the valve rod 4 and the output shaft 3 are integrally connected through the close cooperation of the T-shaped slot 301 and the T-shaped block 401, and the real-time position of the valve plate 5 is always kept synchronous with the position sensor and real-time feedback to the ECU working condition data, which has the advantages of fast response speed and good connectivity.

[0031] Embodiment 2: a movable connection structure of an output shaft of a motor and a valve rod.

[0032] The utility model provides a movable connection structure of an output shaft of a motor and a valve rod, especially the EGR valve structure design of the movable connection of the screw rod of the motor and the valve rod 4, applies engine exhaust gas recirculation flow control, the purpose is to improve engine thermal efficiency and economy, reduces nitrogen oxides NOx emission simultaneously.

[0033] The embodiment aims at the problems in the prior art, as shown in the drawings, Figure 6 The valve rod 4 is in contact with the output shaft 3 of the EGR valve actuator in a split type, and there is a gap between the two, which causes the exhaust gas flow of the valve body to not be real-time feedback to the position sensor during work, and causes time difference and feedback error and other phenomena.

[0034] In addition, the end of the hollow shaft 1 adopts the mode that the welding disc 10 is welded at the end of the hollow shaft 1, and the laser welding process is high in cost and complex in process.

[0035] As shown in the drawings, Figure 1 The embodiment is used for opening and closing of the EGR valve, comprising a hollow shaft 1, the hollow shaft 1 is connected to a rotor assembly 2, and the rotor assembly 2 is arranged in the inner cavity of a stator assembly 12; the embodiment also comprises a brush holder assembly 13 and a tail cover assembly 14 arranged above the motor.

[0036] As shown in the drawings, Figure 2 and Figure 3As shown, this embodiment also includes an output shaft 3. The upper section of the output shaft 3 and the inner cavity of the hollow shaft 1 are threaded together to achieve axial movement. The lower end of the output shaft 3 is provided with a T-groove 301. When the hollow shaft 1 rotates, it drives the output shaft 3 to rotate and the axis moves up and down.

[0037] like Figure 2 and Figure 3 As shown, this embodiment also includes a valve stem 4, the upper end of which is provided with a T-shaped block 401 that cooperates with the T-shaped groove 301, and the lower end of the valve stem 4 is connected to a valve plate 5; the up and down movement of the valve stem 4 realizes the rapid opening and closing of the valve plate 5.

[0038] like Figure 2 As shown, this embodiment also includes a dust cover 6, which is sleeved on the lower part of the output shaft 3.

[0039] like Figure 1 As shown, this embodiment also includes a spring 7, which is disposed in the inner cavity of the valve body housing 8. The spring 7 is sleeved on the valve stem 4 and the other end is connected to the valve body housing 8. The valve stem 4 is provided with a spring 7 slot, and the upper end of the spring 7 is fixedly connected to the valve stem 4 through the spring 7 slot, thereby realizing the reset movement after the valve stem 4 is pressed down.

[0040] like Figure 5 As shown, this embodiment also includes a large ball bearing 11 connected to the lower end of the hollow shaft 1. A flange 101 is provided radially outward at the lower end of the hollow shaft 1, and the upper surface of the flange 101 abuts against the lower end of the large ball bearing 11. The flange 101 is used to better position the large ball bearing 11, making the movement of the output shaft 3 and the hollow shaft 1 smoother and the control precision higher.

[0041] like Figure 4 As shown, in this embodiment, the upper section of the output shaft 3 is provided with a threaded section, and the upper section of the output shaft 3 is constructed as a screw section, which is internally threaded with the hollow shaft 1. The lower section of the output shaft 3 is configured as a connecting section, and the two sides of the connecting section are constructed as planes, with the T-groove 301 perpendicularly penetrating the planes.

[0042] like Figure 1 As shown, in this embodiment, the present invention also includes a guide end cover 15, which is sleeved on the output shaft 3, positioned above the dust cover 6, and positioned below the large ball bearing 11, for positioning and guiding the output shaft 3.

[0043] like Figure 1 As shown, in this embodiment, the present invention also includes a valve stem sealing ring 9 disposed between the valve stem 4 and the valve body housing 8. This seals the upper part of the valve stem 4, improving the service life of the EGR valve.

[0044] In the embodiment, the axial dimension of the cavity of the T-shaped slot 301 is 1.05-1.1 times of the axial dimension of the head of the T-shaped block 401. The dimension makes the T-shaped slot 301 and the T-shaped block 401 be clearance fit, which ensures the convenience of installation and reduces the axial clearance as much as possible, and improves the control accuracy.

[0045] In the embodiment, the diameter of the flange 101 radially outwardly arranged at the lower end of the hollow shaft 1 is 1.2-1.3 times of the outer diameter of the hollow shaft 1. The installation stability of the bearing is ensured, and the installation difficulty is reduced.

Claims

1. A movable connection structure between the output shaft of an electric motor and a valve stem, characterized in that... The device includes a hollow shaft (1) connected to a rotor assembly (2); an output shaft (3) whose upper section and the inner cavity of the hollow shaft (1) are threaded together to achieve axial movement, and a T-slot (301) is provided at the lower end of the output shaft (3); a valve stem (4) with a T-block (401) that mates with the T-slot (301) at the upper end of the valve stem (4), and a valve plate (5) connected at the lower end of the valve stem (4); a dust cover (6) fitted onto the lower part of the output shaft (3); and a spring (7) fitted onto the valve stem (4) with the other end connected to the valve body housing (8).

2. The movable connection structure between the output shaft of a motor and the valve stem according to claim 1, characterized in that: It also includes a large ball bearing (11) connected to the lower end of the hollow shaft (1). A flange (101) is provided radially outward at the lower end of the hollow shaft (1). The upper surface of the flange (101) abuts against the lower end of the large ball bearing (11).

3. The movable connection structure between the output shaft of the motor and the valve stem according to claim 1, characterized in that: The upper section of the output shaft (3) is provided with a threaded section, and the lower section of the output shaft (3) is provided with a connecting section. The two sides of the connecting section are constructed as planes, and the T-shaped groove (301) penetrates the plane vertically.

4. The movable connection structure between the output shaft of the motor and the valve stem according to claim 1, characterized in that... It also includes a guide end cap (15), which is sleeved on the output shaft (3) and positioned above the dust cover (6).

5. The movable connection structure between the output shaft of a motor and the valve stem according to claim 1, characterized in that: It also includes a valve stem seal ring (9) disposed between the valve stem (4) and the valve body housing (8).

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