EGR (Exhaust Gas Recirculation) valve assembly tool and angle deviation adjusting method

Abstract

According to the EGR valve assembly tool and the angle deviation adjusting method, the workpiece fixing unit and the workpiece alignment unit are arranged on the workbench, welding work of an EGR valve on the workbench can be fixed through the arrangement of the workpiece fixing unit so as to prevent deviation of the EGR valve in the assembly and welding process, the assembly convenience and the welding accuracy are improved, and the welding efficiency is improved. The workpiece alignment unit is arranged to align the assembly angle of the motor unit and the valve body unit of the EGR valve in the assembly process, in the alignment process, magnetic force is generated through electrification so as to drive the N pole and the S pole of a rotor shaft to coincide, an air cylinder drives a push rod to make contact with a rotor, and the push rod is driven to rotate to the designated angle in a servo mode. In the process, manual angle correction is not needed, the assembling efficiency is improved, and the angle alignment accuracy degree is improved.

Description

Technical Field

[0001] The present invention relates to the technical field of EGR valves, and in particular to an EGR valve assembly tool and an angle deviation adjustment method. Background Technology

[0002] The existing technology has high requirements for raw material costs and requires the use of wear-resistant materials as a whole, but the wear-resistant parts are only the moving parts of the transmission shaft, and the other parts have lower material requirements; the transmission plate and the transmission shaft of the existing product are interference fit and need to be pressed, and the force-bearing part is the transmission shaft, which has the risk of deformation; the processing requirements for the magnetic ring positioning holes are high, which greatly increases the processing cost. The magnetic ring assembly requires high skills for personnel and has a certain probability of failure; the existing product transmission shaft and transmission plate assembly requires adjustment of the polarity deviation angle, and the use of tooling for positioning. The angle cannot be accurately aligned, and there are variables after pressing. After pressing, the existing products and structures need to be fixed by welding, and it is impossible to achieve automation and precise adjustment of the stator and rotor polarity deviation angles, and product consistency cannot be effectively guaranteed. SUMMARY OF THE INVENTION

[0003] In view of this, the present invention provides an EGR valve assembly tool and an angle deviation adjustment method.

[0004] To achieve the above purpose, the present invention provides the following technical solutions: An EGR valve assembly tool, comprising a workbench, on which a workpiece alignment unit and a workpiece fixing unit are arranged, on which an EGR valve is arranged, and the EGR valve has a motor unit and a valve body unit, the motor unit is rotatably arranged on the workpiece fixing unit, the workpiece alignment unit has a first magnetic part, the motor unit has a second magnetic part, the first magnetic part and the second magnetic part have opposite magnetic poles, the first magnetic part drives the motor unit to rotate on the motor fixing unit through the second magnetic part, and the motor unit is connected to the valve body unit after rotation.

[0005] Preferably, the workpiece alignment unit includes a cylinder, a cylinder push rod and a driving motor, a through hole is provided on the workbench, the workpiece fixing unit includes a motor fixing part and a valve body fixing part, the motor unit is arranged on the motor fixing part, the valve body unit is arranged on the valve body fixing part, the first magnetic part is arranged on the cylinder push rod, one end of the cylinder push rod is connected to the cylinder, and one end of the cylinder push rod having the first magnetic part passes through and extends into the motor fixing part.

[0006] Preferably, the motor unit includes a motor housing, a transmission shaft, and a motor rotor. An installation cavity is formed inside the motor housing. The transmission shaft and the motor rotor are arranged in the installation cavity. The motor rotor is sleeved on the transmission shaft. A wear-resistant positioning assembly is arranged on the transmission shaft. The wear-resistant positioning assembly includes a wear-resistant part and a positioning support sleeve. Both the wear-resistant part and the positioning support sleeve are sleeved on the transmission shaft. Two sides of the wear-resistant part are respectively connected to the transmission shaft and the rotor. Two sides of the positioning support sleeve are respectively connected to the transmission shaft and the motor housing.

[0007] Preferably, the positioning support sleeve has a positioning part and a limiting part. A positioning through hole is formed in the positioning part. One end of the transmission shaft passes through the positioning support sleeve through the positioning through hole and is connected to the valve body unit. A positioning port is formed in the motor housing. The part of the positioning part of the positioning support sleeve located below the limiting part extends into the positioning port and is connected to the motor housing. The limiting part is arranged in an annular structure.

[0008] Preferably, the positioning parts of the positioning support sleeve are arranged at the upper and lower ends of the limiting part. The positioning part includes an upper positioning part and a lower positioning part. The positioning through hole runs through the upper positioning part, the limiting part, and the lower positioning part. And the outer diameter of the upper positioning part is smaller than that of the lower positioning part.

[0009] Preferably, there is a gap between the hole wall of the positioning through hole of the positioning support sleeve and the transmission shaft. The top end of the upper positioning part of the positioning support sleeve extends towards the transmission shaft to form an upper contact positioning part. And the bottom end of the lower positioning part of the positioning support sleeve extends towards the transmission shaft to form a lower contact positioning part. The upper contact positioning part and the lower contact positioning part are respectively connected to the upper part and the lower part of the transmission shaft.

[0010] An EGR valve angle deviation adjustment method includes the following steps: Step 1: Fix the workpiece. Fix the EGR valve on the workbench. The motor unit and the valve body unit of the EGR valve are respectively installed on the motor fixing part and the valve body fixing part of the workpiece fixing unit. And the motor unit can rotate on the motor fixing part. Step 2: Power on and align. Start the drive motor in the alignment unit and power on the motor unit. The second magnetic part in the motor unit is powered on to generate magnetic force. Drive the servo motor through the cylinder for magnetic ring positioning. Rotate the magnetic ring to a specified angle and send a signal for pre-welding. Step 3: After welding is completed, start the test system for testing. If the test is qualified, send a signal for final welding. The positioning rod and the driving hook plate are in a small clearance fit.

[0011] The beneficial effects of the present invention are as follows: By providing a workpiece fixing unit and a workpiece alignment unit on the workbench, the workpiece fixing unit can fix the welding work of the EGR valve on the workbench to prevent the offset of the EGR valve during the assembly and welding processes, improving the convenience of assembly and the accuracy of welding. Moreover, the workpiece alignment unit can align the assembly angles of the motor unit and the valve body unit of the EGR valve during the assembly process. During the alignment process, magnetic force is generated by energization to drive the N and S poles of the rotor shaft to coincide. The cylinder drives the push rod to contact the rotor, and the servo drives the push rod to rotate to a specified angle. This process does not require manual angle correction, improving the assembly efficiency and the accuracy of angle alignment. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings required for use in the description of the embodiments or the prior art. Obviously, the drawings in the following description are only some embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can be obtained based on these drawings.

[0013] Attached Figure 1 is a schematic structural diagram of the present invention; Attached Figure 2 is a schematic structural diagram of the EGR valve; Attached Figure 3 is a schematic connection diagram of the valve body unit and the motor unit. EMBODIMENTS

[0014] The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the drawings in the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, rather than all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts belong to the scope of protection of the present invention.

[0015] The following will further describe the present invention with reference to the accompanying drawings of the specification.

[0016] The present invention provides the following technical solutions: As attached Figures 1-3As shown in the figure, the present invention discloses an EGR valve assembly tooling, which includes a workbench 1. A workpiece alignment unit 2 and a workpiece fixing unit 3 are arranged on the workbench 1. An EGR valve 4 is arranged on the workpiece fixing unit 3. The EGR valve 4 has a motor unit 5 and a valve body unit 6. The motor unit 5 is rotatably arranged on the workpiece fixing unit 3. The workpiece alignment unit 2 has a first magnetic part 7, and the motor unit 5 has a second magnetic part 8. The first magnetic part 7 and the second magnetic part 8 have opposite magnetic poles. The first magnetic part drives the motor unit 5 to rotate on the motor fixing unit through the second magnetic part 8, and after the motor unit 5 rotates, it is connected to the valve body unit 6. Specifically, in this design, by arranging the workpiece fixing unit 3 and the workpiece alignment unit 2 on the workbench 1, the setting of the workpiece fixing unit 3 can fix the welding work of the EGR valve 4 on the workbench 1 to prevent the offset of the EGR valve 4 during the assembly and welding processes, improving the convenience of assembly and the accuracy of welding. And the setting of the workpiece alignment unit 2 can align the assembly angles of the motor unit 5 and the valve body unit 6 of the EGR valve 4 during the assembly process. During the alignment process, magnetic force is generated by electrification to drive the N and S poles of the rotor shaft to coincide. The cylinder 9 drives the push rod to contact the rotor, and the servo drives the push rod to rotate to a specified angle. This process does not require manual angle correction, improving the assembly efficiency and the accuracy of angle alignment.

[0017] Further, the workpiece alignment unit 2 includes a cylinder 9, a cylinder push rod 10 and a driving motor 11. A through hole 12 is opened on the workbench 1. The workpiece fixing unit 3 includes a motor fixing part 13 and a valve body fixing part 14. The motor fixing part and the valve body fixing part in the workpiece fixing unit can be replaced by cylinder jigs or other jigs in the prior art that can clamp the motor unit and the valve body unit, so they will not be elaborated here. The motor unit 5 is arranged on the motor fixing part 13, and the valve body unit 6 is arranged on the valve body fixing part 14. The first magnetic part 7 is arranged on the cylinder push rod 10. One end of the cylinder push rod 10 is connected to the cylinder 9, and the end of the cylinder push rod 10 with the first magnetic part 7 passes through and extends into the motor fixing part 13. Specifically, in this embodiment, the driving motor 11 in the alignment unit is connected to the cylinder push rod 10. After the driving motor 11 is electrified, the first magnetic part 7 on the cylinder push rod 10 generates magnetic force. Thus, during the movement of the motor push rod, since the magnetic force on the first magnetic part 7 is opposite to the magnetic pole on the second magnetic part 8, the first magnetic part 7 and the second magnetic part 8 gradually rotate and approach each other during the movement, thereby adjusting the angle of the motor unit 5. The rotation angle can be accurate to 0.1°, and the product performance and product consistency are greatly improved.

[0018] Further, the motor unit 5 includes a motor housing 15, a transmission shaft 16, and a motor rotor 17. An installation cavity 18 is formed inside the motor housing 15. The transmission shaft 16 and the motor rotor 17 are arranged inside the installation cavity 18. The motor rotor 17 is sleeved on the transmission shaft 16. A wear-resistant positioning assembly 19 is arranged on the transmission shaft 16. The wear-resistant positioning assembly 19 includes a wear-resistant part 20 and a positioning support sleeve 21. Both the wear-resistant part 20 and the positioning support sleeve are sleeved on the transmission shaft 16. Two sides of the wear-resistant part 20 are respectively connected to the transmission shaft 16 and the rotor. Two sides of the positioning support sleeve 21 are respectively connected to the transmission shaft 16 and the motor housing 15. Specifically, in this embodiment, by arranging the wear-resistant positioning assembly 19 on the transmission shaft 16, the wear between the transmission shaft 16 and the motor rotor 17 can be reduced. Moreover, the positioning support sleeve 21 in the wear-resistant positioning assembly 19 can position the part of the upper half of the transmission shaft 16 in contact with the valve body, preventing the swing of the transmission shaft 16 during rotation, thereby improving the stability of the transmission shaft 16 and the operation of the motor unit 5.

[0019] Further, the wear-resistant part 20 is sleeved between the transmission shaft 16 and the motor rotor 17, and the wear-resistant part 20 is respectively connected to the transmission shaft 16 and the motor rotor 17. Specifically, in this embodiment, by arranging the wear-resistant part 20 between the transmission shaft 16 and the motor rotor 17, the wear between the transmission shaft 16 and the motor rotor 17 can be reduced, thereby extending the service life. Moreover, the noise generated during the operation between the transmission shaft 16 and the motor rotor 17 can be reduced, and the wear-resistant part is an injection-molded copper sleeve.

[0020] Further, the positioning support sleeve 21 has a positioning part 22 and a limiting part 23. A positioning through hole 24 is opened on the positioning part 22. One end of the transmission shaft 16 passes through the positioning support sleeve 21 through the positioning through hole 24 and is connected to the valve body unit 6. A positioning port 25 is opened on the motor housing. The part of the positioning part 22 of the positioning support sleeve 21 located below the limiting part 23 extends into the positioning port 25 and is connected to the motor housing 15. The limiting part 23 is arranged in an annular structure. Specifically, in this embodiment, the setting of the positioning part 22 can position the transmission shaft 16, preventing the swing of the transmission shaft 16 during rotation, thereby improving the stability of the transmission shaft 16. The limiting part 23 can limit the positioning support sleeve 21 on the motor unit 5, preventing the positioning support sleeve 21 from slipping off.

[0021] Further, the positioning portions 22 of the positioning support sleeve 21 are arranged at the upper and lower ends of the limiting portion 23. The positioning portions 22 include an upper positioning portion 28 and a lower positioning portion 29. The positioning through hole 24 penetrates through the upper positioning portion 28, the limiting portion 23, and the lower positioning portion 29. And the outer diameter of the upper positioning portion 28 is smaller than that of the lower positioning portion 29. Such a structural arrangement can expand the space at the lower part of the positioning opening 25 through the lower positioning portion 29. Thus, after the wear-resistant member 20 is assembled, there is still a gap between the motor rotor and the transmission shaft, which is convenient for rotation, and the wear of the wear-resistant member is reduced during the rotation process. Moreover, the settings of the upper positioning portion 28 and the lower positioning portion 29 can also provide stronger stability for the overall positioning of the transmission shaft.

[0022] Further, there is a gap between the hole wall of the positioning through hole 24 of the positioning support sleeve 21 and the transmission shaft. The top end of the upper positioning portion 28 of the positioning support sleeve 21 extends towards the transmission shaft to form an upper contact positioning portion 30. And the bottom end of the lower positioning portion 29 of the positioning support sleeve 21 extends towards the transmission shaft to form a lower contact positioning portion 31. The upper contact positioning portion 30 and the lower contact positioning portion 31 are respectively in contact with the upper and lower parts of the transmission shaft. Such a structural arrangement can not only position the transmission shaft but also reduce the contact area between the positioning support sleeve and the transmission shaft, thereby reducing the wear of the two. And the contact positioning portion 30 and the lower contact positioning portion 31 can position the upper and lower ends of the transmission shaft simultaneously, preventing the swinging phenomenon of unstable positioning at one end.

[0023] Specifically, the valve body unit 6 includes an EGR valve body 26. The EGR valve body 26 is provided with a hook plate 27. The hook plate 27 and the transmission shaft 16 are in clearance fit. Such a structural arrangement can reduce the friction between the hook plate and the transmission shaft, thereby prolonging the service life of the transmission shaft.

[0024] An EGR valve angle deviation adjustment method includes the following steps: Step 1: Fix the workpiece. Fix the EGR valve 4 on the workbench 1. The motor unit 5 and the valve body unit 6 of the EGR valve 4 are respectively installed on the motor fixing portion 13 and the valve body fixing portion 14 of the workpiece fixing unit 3. And the motor unit 5 can rotate on the motor fixing portion 13. Specifically, in this embodiment, the first magnetic portion 7 is a permanent magnet, and the second magnetic portion 8 is an electromagnet. The electromagnet is energized to generate magnetic attraction and cooperate magnetically with the permanent magnet.

[0025] Step 2: Power on for alignment. Start the drive motor 11 in the alignment unit and power on the motor unit 5. The second magnetic part 8 in the motor unit 5 generates magnetic force when powered on. The cylinder 9 drives the servo motor for magnetic ring positioning, rotates the magnetic ring to a specified angle, which is 8°, so that the N and S poles of the drive rotor shaft coincide. The cylinder 9 drives the push rod to contact the rotor, and then sends a signal for pre-welding. Specifically, compared with the prior art, this step does not require manual angle correction, improving the assembly efficiency and the accuracy of angle alignment. Specifically, in this step, when the relative positions of the motor unit 5 and the valve body unit 6 are in an unaligned state, there is a deviation angle between the corresponding first magnetic part 7 and the second magnetic part 8, and the angle of this deviation angle is 8°. Due to the existence of this deviation angle, the second magnetic part 8 cannot generate magnetic force when not powered on, so automatic alignment cannot be achieved. When the drive motor is powered on, the second magnetic part 8 made of electromagnetic material generates magnetic force, and this magnetic force is opposite to the magnetic pole of the first magnetic part 7. Therefore, the two attract each other, and the position between the second magnetic part (i.e., the magnetic ring) on the motor unit and the first magnetic part 7 is aligned after rotating 8°, without manual calibration.

[0026] Step 3: After welding is completed, start the test system for testing. If the test is qualified, send a signal for final welding. The positioning rod and the drive hook plate are in clearance fit.

[0027] The above description of the disclosed embodiments enables those skilled in the art to implement or use the present invention. Various modifications to these embodiments will be obvious to those skilled in the art, and the general principles defined herein can be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention will not be limited to the embodiments shown herein, but will be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. An EGR valve assembly tool, comprising a workbench, characterized in that: A workpiece alignment unit and a workpiece fixing unit are arranged on the workbench, an EGR valve is arranged on the workpiece fixing unit, the EGR valve has a motor unit and a valve body unit, the motor unit is rotatably arranged on the workpiece fixing unit, the workpiece alignment unit has a first magnetic part, the motor unit has a second magnetic part, the first magnetic part and the second magnetic part have opposite magnetic poles, the first magnetic part drives the motor unit to rotate on the motor fixing unit through the second magnetic part, and the motor unit is connected to the valve body unit after rotation.

2. The EGR valve assembly tool according to claim 1, characterized in that: The workpiece alignment unit includes a cylinder, a cylinder push rod and a driving motor. A through hole is provided on the workbench. The workpiece fixing unit includes a motor fixing part and a valve body fixing part. The motor unit is arranged on the motor fixing part. The valve body unit is arranged on the valve body fixing part. The first magnetic part is arranged on the cylinder push rod. One end of the cylinder push rod is connected to the cylinder. One end of the cylinder push rod having the first magnetic part passes through the through hole and extends into the motor fixing part.

3. The EGR valve assembly tool according to claim 2, characterized in that: The motor unit includes a motor housing, a transmission shaft and a motor rotor. An installation cavity is formed in the motor housing. The transmission shaft and the motor rotor are arranged in the installation cavity. The motor rotor is sleeved on the transmission shaft. A wear-resistant positioning assembly is arranged on the transmission shaft. The wear-resistant positioning assembly includes a wear-resistant part and a positioning support sleeve. The wear-resistant part and the positioning support sleeve are both sleeved on the transmission shaft. Two sides of the wear-resistant part are respectively connected to the transmission shaft and the rotor. Two sides of the positioning support sleeve are respectively connected to the transmission shaft and the motor housing.

4. The EGR valve assembly tool according to claim 3, characterized in that: The positioning support sleeve has a positioning part and a limiting part. The positioning part is provided with a positioning through hole. One end of the transmission shaft passes through the positioning support sleeve through the positioning through hole and is connected to the valve body unit. The motor housing is provided with a positioning opening. The positioning part of the positioning support sleeve is located at the lower part of the limiting part and extends into the positioning opening to be connected to the motor housing. The limiting part is arranged in an annular structure.

5. The EGR valve assembly tool according to claim 4, characterized in that: The positioning part of the positioning support sleeve is arranged at the upper and lower ends of the limiting part, and the positioning part includes an upper positioning part and a lower positioning part. The positioning through hole passes through the upper positioning part, the limiting part and the lower positioning part, and the outer diameter of the upper positioning part is smaller than the outer diameter of the lower positioning part.

6. The EGR valve assembly tool according to claim 5, characterized in that: There is a gap between the hole wall of the positioning through hole of the positioning support sleeve and the transmission shaft, the top end of the upper positioning part of the positioning support sleeve extends toward the transmission shaft to form an upper contact positioning part, and the bottom end of the lower positioning part of the positioning support sleeve extends toward the transmission shaft to form a lower contact positioning part, and the upper contact positioning part and the lower contact positioning part are respectively connected to the upper and lower parts of the transmission shaft.

7. A method for adjusting an EGR valve angle deviation, characterized in that: The steps include: Step 1: Fix the workpiece, fix the EGR valve on the workbench, the motor unit and the valve body unit of the EGR valve are respectively installed on the motor fixing part and the valve body fixing part of the workpiece fixing unit, and the motor unit can rotate on the motor fixing part; Step 2: Power on for alignment, start the drive motor in the alignment unit, and power on the motor unit. The second magnetic part in the motor unit is powered on to generate magnetic force, and the servo motor is driven by the cylinder to position the magnetic ring, rotate the magnetic ring to a specified angle, and send a signal for pre-welding. Step 3: After welding is completed, start the test system for testing. If the test is qualified, send a signal for final welding. The positioning rod and the driving hook plate are clearance fit.

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