CN216078512U - Valve shaft driving device of regulating valve of EGR system - Google Patents
Valve shaft driving device of regulating valve of EGR system Download PDFInfo
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- CN216078512U CN216078512U CN202122440408.9U CN202122440408U CN216078512U CN 216078512 U CN216078512 U CN 216078512U CN 202122440408 U CN202122440408 U CN 202122440408U CN 216078512 U CN216078512 U CN 216078512U
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Abstract
The utility model discloses a valve shaft driving device of a regulating valve of an EGR system, which comprises a driving shell, wherein a valve shaft is axially and slidably arranged on the driving shell, the lower end of the valve shaft extends out of the driving shell and is fixedly provided with a valve clack, a motor is fixed on the driving shell, a sun gear is fixed on an output shaft of the motor, a gear ring is rotatably arranged in the driving shell, at least two planetary gears are rotatably arranged on the driving shell between the sun gear and the gear ring, the central shafts of the planetary gears are fixed on the driving shell, the planetary gears are respectively meshed with the sun gear and the gear ring, the upper end of the valve shaft is provided with an external thread section, the rotation center of the gear ring is provided with an internal thread hole, the external thread section is inserted into the internal thread hole to be matched with the internal thread hole in a threaded manner, the valve shaft driving device can enable the valve shaft and the valve clack to axially and linearly move without rotating, thereby reducing abrasion, ensuring tighter closing and higher reliability in long-term use, in addition, the valve shaft driving device has reliable power transmission and lower noise.
Description
Technical Field
The utility model relates to a valve shaft driving device which is used in a regulating valve in an EGR system.
Background
EGR(EGR：Exhaust Gas Recirculation) is the augmentation of CO in the intake air by recirculating a portion of the exhaust gas to the intake system2And reducing the temperature of the combustion chamber to reduce NOx. A cooler in an EGR system of an automobile is a device for cooling exhaust gas. The gas exhausted by the engine is cooled by the cooler and then flows back to the engine to participate in combustion, so that the amount of the gas flowing back to the engine needs to be accurately controlled, and the temperature of the combustion chamber can be accurately adjusted. And the regulating valve in the EGR system is used for regulating the air return amount. The current regulating valve mainly comprises a valve body, a valve shaft and a valve clack, wherein the valve clack is fixed on the valve shaft, and the valve shaft drives the valve clack to open or close an air inlet and an air outlet of the valve body. The valve shaft is driven by a valve shaft driving device. The existing driving device comprises a shell, a motor is fixed in the shell, a driving gear is fixed on an output shaft of the motor, a driving sleeve is rotatably installed on the shell, a driven gear meshed with the driving gear is fixed on the driving sleeve, a valve shaft is directly inserted into the driving sleeve, a driving hole extending in the axial direction of a spiral shaft is formed in the driving sleeve, and a bearing inserted into the driving hole is installed on the valve shaft, so that when the output shaft of the motor rotates, the driving gear drives the driven gear to rotate, the driven gear rotates to drive the driving sleeve to rotate, and the bearing is located in the driving hole, so that the driving hole drives the bearing to spirally move along the driving hole, axial lifting is realized while the valve shaft rotates, a valve clack is driven to move to open or close, a magnetic column is arranged at the top of the valve shaft, and a Hall sensor for detecting the magnetic column is arranged on the shell, thereby detecting the lifting distance of the valve shaft.
However, the valve shaft driving device with the structure has the following disadvantages: 1. in the process of lifting the valve shaft driven by the motor, because the bearing runs in the driving hole, friction is generated between the bearing and the driving hole, certain noise is generated, in the process of long-term abrasion, the fit clearance between the bearing and the driving hole is increased, and the driving precision is reduced while the noise is increased; 2. the valve shaft of the structure rotates in the process of axial lifting, the rotation is not necessary in the opening and closing action of the regulating valve, therefore, the valve clack also rotates in the closing process, and the valve clack is contacted with the valve body and rotates and rubs, so the valve clack is easy to wear and leads to loose closing.
SUMMERY OF THE UTILITY MODEL
The technical problem to be solved by the utility model is as follows: the valve shaft driving device of the regulating valve of the EGR system can drive the valve shaft to lift more stably, reduce noise and avoid abrasion of a valve clack.
In order to solve the technical problems, the technical scheme of the utility model is as follows: the utility model provides a valve shaft drive arrangement of governing valve of EGR system, includes the drive shell, axial slidable mounting has the valve shaft on the drive shell, and the lower extreme of valve shaft stretches out and is fixed with the valve clack from the drive shell, be fixed with the motor on the drive shell, be fixed with sun gear on the output shaft of motor, drive shell internal rotation installs the ring gear, it installs two at least planetary gears to lie in to rotate between sun gear and the ring gear on the drive shell, planetary gear's center pin is fixed on the drive shell, planetary gear respectively with sun gear and ring gear meshing, the upper end of valve shaft is provided with the external screw thread section, the centre of rotation department of ring gear is provided with the internal thread hole, the external screw thread section inserts in the internal thread hole rather than screw-thread fit.
Preferably, the external thread section at the upper end of the valve shaft extends out of the internal thread hole, the upper end of the valve shaft is fixedly provided with a shaft bracket, and a compression spring is arranged between the shaft bracket and the driving shell.
As a preferable mode, the shaft bracket includes a connecting plate portion located at the center, the outer periphery of the connecting plate portion is provided with at least two radially extending sections, each radially extending section is located between the planetary gears, each radially extending section is provided with a spring mounting groove, and the compression spring is mounted between the spring mounting groove and the drive housing.
Preferably, a magnet mounting support is arranged on one of the radial extension sections, and a magnet block which is conveniently detected by the sensor is mounted on the magnet mounting support.
Preferably, the planetary gear includes a first gear part and a second gear part located below the first gear part, the first gear part has a diameter larger than that of the second gear part, the first gear part is engaged with the sun gear, and the second gear part is engaged with the ring gear.
As a preferred scheme, the driving shell comprises a middle shell, an upper shell, a lower shell and an upper end cover, the upper shell and the lower shell are respectively fixed at the upper end and the lower end of the middle shell, the motor is fixed in the upper shell, an output shaft of the motor downwards extends into the middle shell, the upper end cover is fixed at the upper end of the upper shell, a central shaft of the planetary gear is fixed at the lower end of the upper shell, and the gear ring is rotatably installed in the middle shell.
After the technical scheme is adopted, the utility model has the effects that: because the valve shaft driving device of the regulating valve of the EGR system comprises a driving shell, a valve shaft is axially and slidably mounted on the driving shell, the lower end of the valve shaft extends out of the driving shell and is fixed with a valve clack, a motor is fixed on the driving shell, a sun gear is fixed on an output shaft of the motor, a gear ring is rotatably mounted in the driving shell, at least two planetary gears are rotatably mounted between the sun gear and the gear ring on the driving shell, central shafts of the planetary gears are fixed on the driving shell, the planetary gears are respectively meshed with the sun gear and the gear ring, an external thread section is arranged at the upper end of the valve shaft, an internal thread hole is arranged at the rotation center of the gear ring, and the external thread section is inserted into the internal thread hole to be in threaded fit with the internal thread hole, so that the output shaft of the motor drives the sun gear to rotate, and then the planetary gears are driven to rotate, the central shaft of the planetary gear is fixed, so the planetary gear can drive the gear ring to rotate, and the valve shaft and the gear ring are in threaded connection, so the valve shaft can move linearly when the gear ring rotates, the valve shaft can not rotate, the valve clack can only lift and can not rotate, the valve clack is reduced in abrasion, the valve is closed more tightly, the reliability is higher after long-term use, and in addition, the power transmission of the valve shaft driving device is reliable, and the noise is smaller.
And because the external thread section at the upper end of the valve shaft extends out of the internal thread hole, the upper end of the valve shaft is fixedly provided with the shaft bracket, the compression spring is arranged between the shaft bracket and the driving shell, and the shaft bracket and the compression spring can provide elastic pressure for the axial direction of the valve shaft, thus a matching gap can be formed between the external thread section and the internal thread hole on the valve shaft originally, the elastic pressure can ensure that the external thread section and the internal thread hole are in threaded contact more tightly and reliably, and the influence of the threaded matching gap on the lifting response speed of the valve shaft is avoided.
And because one of the radial extension sections is provided with the magnet mounting support, the magnet block which is conveniently detected by the sensor is mounted on the magnet mounting support, the shaft bracket can facilitate the mounting of the magnet block, and further facilitate the sensor to detect the lifting distance of the valve shaft, and the sensor adopts the conventional Hall sensor at present.
And because the planetary gear comprises a first gear part and a second gear part positioned below the first gear part, the diameter of the first gear part is larger than that of the second gear part, the first gear part is meshed with the sun gear, and the second gear part is meshed with the gear ring, after the structure is adopted, the transmission deceleration effect among the sun gear, the planetary gear and the gear ring is more obvious, so that the closing force of the valve shaft can be larger, the lifting speed of the valve shaft can be reduced, and the phenomenon that the valve clack is violently lifted due to overhigh rotating speed of the motor is avoided.
Drawings
The utility model is further illustrated with reference to the following figures and examples.
FIG. 1 is a perspective view of an embodiment of the present invention;
FIG. 2 is a perspective axial half-sectional view of an embodiment of the present invention;
FIG. 3 is a top view of an embodiment of the present invention with the sun gear, planet gears, ring gear, carrier and magnet mounting brackets mated to one another;
FIG. 4 is a partial half-sectional view of the ring gear and valve shaft of FIG. 2;
FIG. 5 is a perspective view of a planetary gear of an embodiment of the present invention;
FIG. 6 is a schematic view of a spring and pedestal of an embodiment of the present invention;
in the figure: 1. a drive housing; 101. an upper end cover; 102. a middle housing; 103. an upper housing; 104. a lower housing; 2. a valve shaft; 201. an external threaded section; 3. a valve flap; 4. a motor; 5. an output shaft; 6. a sun gear; 7. a ring gear; 701. an internally threaded bore; 8. a planetary gear; 801. a first gear portion; 802. a second gear portion; 9. a central shaft; 10. a pedestal; 1001. a connecting plate portion; 1002. a radially extending section; 1003. a spring mounting groove; 1004. a spring guide rod; 11. a compression spring; 12. a magnet mounting support; 13. and a magnet block.
Detailed Description
The present invention is described in further detail below with reference to specific examples.
As shown in fig. 1 to 2, a valve shaft 2 driving apparatus of a regulator valve of an EGR system, includes a driving housing 1, a valve shaft 2 is axially and slidably arranged on the driving shell 1, the lower end of the valve shaft 2 extends out of the driving shell 1 and is fixed with a valve clack 3, a motor 4 is fixed on the driving shell 1, a sun gear 6 is fixed on an output shaft 5 of the motor 4, a gear ring 7 is rotatably arranged in the driving shell 1, at least two planet gears 8 are rotatably arranged on the driving shell 1 between the sun gear 6 and the gear ring 7, the central shaft 9 of the planet gear 8 is fixed on the driving shell 1, the planet gear 8 is respectively meshed with the sun gear 6 and the ring gear 7, the upper end of the valve shaft 2 is provided with an external thread section 201, the rotation center of the gear ring 7 is provided with an internal thread hole 701, and the external thread section 201 is inserted into the internal thread hole 701 to be in threaded fit with the internal thread hole 701.
In this embodiment, three planetary gears 8 are installed to be evenly distributed on the circumference of the rotation center of the ring gear 7, and the planetary gears 8 are meshed with the ring gear 7, so that the output shaft 5 of the motor 4 drives the sun gear 6 to rotate, and further drives the planetary gears 8 to rotate, the central shaft 9 of the planetary gears 8 is fixed, so that the planetary gears 8 start to rotate around the central shaft 9, so that the planetary gears 8 drive the ring gear 7 to rotate, because the valve shaft 2 is in threaded connection with the ring gear 7, the valve shaft 2 moves up and down linearly when the ring gear 7 rotates, thereby realizing the lifting and lowering of the valve shaft 2, the ring gear 7 is installed to rotate without changing the axial position, the internal threaded hole 701 and the external threaded section 201 of the valve shaft 2 form a screw nut mechanism, so that the valve shaft 2 rises linearly without rotating itself when the ring gear 7 rotates, so that the valve flap 3 only rises and falls without rotating, therefore, the abrasion of the valve clack 3 is reduced, the closing is tighter, the reliability is higher after long-term use, in addition, the power transmission of the valve shaft 2 driving device is reliable, and the noise is lower.
The driving shell 1 comprises a middle shell 102, an upper shell 103, a lower shell 104 and an upper end cover 101, wherein the upper shell 103 and the lower shell 104 are respectively fixed at the upper end and the lower end of the middle shell 102, the motor 4 is fixed in the upper shell 103, an output shaft 5 of the motor 4 extends downwards into the middle shell 102, the upper end cover 101 is fixed at the upper end of the upper shell 103, a central shaft 9 of the planetary gear 8 is fixed at the lower end of the upper shell 103, and the gear ring 7 is rotatably installed in the middle shell 102.
As shown in fig. 2 and 6, the external thread section 201 at the upper end of the valve shaft 2 extends out of the internal thread hole 701, the shaft bracket 10 is mounted at the upper end of the valve shaft 2, the compression spring 11 is arranged between the shaft bracket 10 and the drive housing 1, the shaft bracket 10 comprises a connecting plate part 1001 at the center, at least two radial extension sections 1002 are arranged on the periphery of the connecting plate part 1001, each radial extension section 1002 is located between the planetary gears 8, a spring mounting groove 1003 is arranged on each radial extension section 1002, and the compression spring 11 is mounted between the spring mounting groove 1003 and the drive housing 1.
In the present embodiment, the outer periphery of the web portion 1001 is uniformly provided with three radially extending sections 1002, the extending directions of the radially extending sections 1002 are at an angle of 120 °, as shown in fig. 3, each radially extending section 1002 is located just between the planetary gears 8, a spring guide bar 1004 is arranged on each radial extension section 1002, and because each radial extension section 1002 is provided with a compression spring 11, the compression spring 11 is sleeved on the spring guide bar 1004 and then positioned and arranged in the spring mounting groove 1003, therefore, the compression spring 11 will not fall off or shift from the spring mounting groove 1003 due to different forces during operation, the shaft bracket 10 and the compression spring 11 can apply elastic pressure to the valve shaft 2 in the axial direction, so that the original fitting clearance exists between the external thread section 201 on the valve shaft 2 and the internal thread hole 701, and the elastic pressure can ensure that the threads of the valve shaft 2 are contacted more tightly and reliably, and the influence of the thread fit clearance on the lifting response speed of the valve shaft 2 is avoided.
In this embodiment, a magnet mounting support 12 is disposed on one of the radially extending sections 1002, a magnet block 13 that is conveniently detected by a sensor is mounted on the magnet mounting support 12, the shaft bracket 10 can facilitate the mounting of the magnet block 13, and further facilitate the sensor to detect the lifting distance of the valve shaft 2, and the sensor is a conventional hall sensor.
The working principle of the utility model is as follows: first, the motor 4 is energized, the motor 4 drives the sun gear 6 to rotate, the central shafts 9 of the three planet gears 8 are uniformly fixed on the driving shell 1, the sun gear 6 is meshed with the first gear parts 801 of the planet gears 8, so that power is applied to the planet gears 8, then the central shafts are meshed with the gear ring 7 through the second gear parts 802 of the planet gears 8, the gear ring 7 starts to rotate, due to the existence of the shaft frame 10, the compression springs 11 are sleeved on the spring guide rods 1004 and are arranged in the spring mounting grooves 1003, so that the upper parts of the compression springs 11 are contacted with the lower ends of the upper shells 103 and the upper shells 103 are fixed, the elastic pressure in the axial direction of the shaft frame 10 is provided, the elastic pressure is provided to the valve shaft 2, the internal thread holes 701 in the gear ring 7 are matched with the external thread sections 201 of the valve shaft 2, so that the external threads of the valve shaft 2 are tightly jointed with the internal threads of the gear ring 7, the gear ring 7 is connected by screw thread, the valve shaft 2 is not rotated and moves up and down axially, the position of the magnet block 13 on the magnet mounting support 12 is detected by the Hall sensor, so as to reflect the position of the valve clack 3, and then the system can be opened and closed.
The above-mentioned embodiments are merely descriptions of the preferred embodiments of the present invention, and are not intended to limit the scope of the present invention, and various modifications and alterations made to the technical solution of the present invention without departing from the spirit of the present invention are intended to fall within the scope of the present invention defined by the claims.
Claims (6)
1. The utility model provides a valve shaft drive arrangement of governing valve of EGR system, includes the drive shell, the axial slidable mounting has the valve shaft on the drive shell, and the lower extreme of valve shaft stretches out and is fixed with the valve clack from the drive shell, its characterized in that: the utility model discloses a valve shaft, including drive shell, sun gear, ring gear, drive shell, internal rotation of drive shell, be fixed with the motor on the drive shell, be fixed with sun gear on the output shaft of motor, the ring gear is installed to drive shell internal rotation, it installs two at least planetary gear to lie in to rotate between sun gear and the ring gear on the drive shell, planetary gear's center pin is fixed on the drive shell, planetary gear meshes with sun gear and ring gear respectively, the upper end of valve shaft is provided with the external screw thread section, the centre of rotation department of ring gear is provided with the internal thread hole, the external screw thread section inserts in the internal thread hole rather than screw-thread fit.
2. The valve shaft driving apparatus of a regulator valve of an EGR system according to claim 1, wherein: the external thread section at the upper end of the valve shaft extends out of the internal thread hole, the upper end of the valve shaft is fixedly provided with a shaft bracket, and a compression spring is arranged between the shaft bracket and the driving shell.
3. The valve shaft driving apparatus of a regulator valve of an EGR system according to claim 2, wherein: the pedestal is including being located the connecting plate portion at center, and the periphery of connecting plate portion is provided with two at least radial extension sections, and every radial extension section is located between the planetary gear, all is provided with spring mounting groove on every radial extension section, compression spring installs between spring mounting groove and drive shell.
4. A valve shaft driving apparatus of a regulator valve of an EGR system according to claim 3, wherein: a magnet mounting support is arranged on one of the radial extension sections, and a magnet block which is convenient to detect by the sensor is mounted on the magnet mounting support.
5. The valve shaft driving apparatus of a regulator valve of an EGR system according to claim 4, wherein: the planetary gear includes first gear portion and the second gear portion that is located first gear portion below, and the diameter of first gear portion is greater than the diameter of second gear portion, first gear portion meshes with the sun gear, and second gear portion meshes with the ring gear.
6. The valve shaft driving apparatus of a regulator valve of an EGR system according to claim 5, wherein: the drive shell comprises a middle shell, an upper shell, a lower shell and an upper end cover, wherein the upper shell and the lower shell are respectively fixed at the upper end and the lower end of the middle shell, the motor is fixed in the upper shell, an output shaft of the motor downwards extends into the middle shell, the upper end cover is fixed at the upper end part of the upper shell, a central shaft of the planetary gear is fixed at the lower end of the upper shell, and the gear ring is rotatably installed in the middle shell.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202122440408.9U CN216078512U (en) | 2021-10-11 | 2021-10-11 | Valve shaft driving device of regulating valve of EGR system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202122440408.9U CN216078512U (en) | 2021-10-11 | 2021-10-11 | Valve shaft driving device of regulating valve of EGR system |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN216078512U true CN216078512U (en) | 2022-03-18 |
Family
ID=80638172
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202122440408.9U Active CN216078512U (en) | 2021-10-11 | 2021-10-11 | Valve shaft driving device of regulating valve of EGR system |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN216078512U (en) |
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2021
- 2021-10-11 CN CN202122440408.9U patent/CN216078512U/en active Active
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