阅读说明：本技术 一种柴油发动机排气节流阀 (Exhaust throttle valve of diesel engine ) 是由 杨健春 范礼 姜倩 李后良 蔡维展 吴敏 邵璠 丁万龙 于 2021-06-25 设计创作，主要内容包括：本发明提供一种应用于柴油车辆动力总成系统技术领域的柴油发动机排气节流阀,所述的柴油发动机排气节流阀的节流阀本体(1)包括执行器(2)、蝶阀(3),所述的柴油发动机在怠速或低负荷工况时,整车ECM设置为能够发送阀板开度命令给节流阀本体(1),从而控制节流阀本体(1)的电机(25)转动,使得电机(25)带动阀板(33)向阀板(33)开度减小方向转动的结构。本发明所述的柴油发动机排气节流阀,在柴油发动机处于怠速和低负荷等排温低的工况下时,能够准确、及时减小节流阀的阀板开度提升排气背压并结合柴油发动机喷油策略来提升排温,进而提高后处理单元催化转化效率,降低污染物排放,最终确保排放满足排放法规要求。(The invention provides a diesel engine exhaust throttle valve applied to the technical field of diesel vehicle power assembly systems, wherein a throttle valve body (1) of the diesel engine exhaust throttle valve comprises an actuator (2) and a butterfly valve (3), and when the diesel engine is in an idling or low-load working condition, an entire Engine Control Module (ECM) is set to be a structure capable of sending a valve plate opening command to the throttle valve body (1) so as to control a motor (25) of the throttle valve body (1) to rotate, and the motor (25) drives a valve plate (33) to rotate towards the direction of reducing the valve plate (33) opening. When the diesel engine is in the working condition of low exhaust temperature such as idling and low load, the exhaust throttle valve of the diesel engine can accurately and timely reduce the opening of the valve plate of the throttle valve to improve the exhaust back pressure and improve the exhaust temperature by combining the fuel injection strategy of the diesel engine, thereby improving the catalytic conversion efficiency of the post-treatment unit, reducing the pollutant emission and finally ensuring that the emission meets the emission regulation requirement.)

1. An exhaust throttle valve for a diesel engine, characterized in that: the throttle body (1) of the exhaust throttle valve of the diesel engine comprises an actuator (2) and a butterfly valve (3), a motor (25) is arranged in a shell (10) of the actuator (2), a motor gear (29) of the motor (25) is meshed with a large gear of an intermediate gear (24), the large gear is meshed with a small gear of the intermediate gear (24), the small gear is meshed with a driving gear (20), the driving gear (20) is connected with a driving gear shaft (8), the driving gear shaft (8) is connected with a valve plate (33) of the butterfly valve (2) through a driving arm (9), a magnet (17) is arranged above the driving gear (20), the magnet (17) is arranged to be of a structure capable of feeding back an angular position signal of the driving gear shaft (8) to a Hall angular position sensor (15) in real time, the whole engine ECM is connected with the Hall angular position sensor (15), and the diesel engine is in idling or under a low-load working condition, the whole vehicle ECM is set to be capable of sending a valve plate opening command to the throttle valve body (1) so as to control a motor (25) of the throttle valve body (1) to rotate, and the motor (25) drives the valve plate (33) to rotate towards the opening reducing direction of the valve plate (33).

2. The diesel engine exhaust throttle valve according to claim 1, characterized in that: when the motor (25) drives the valve plate (33) to rotate towards the opening reducing direction of the valve plate (33), the rotation angle of the motor (25) outputs rotation angle torque after speed reduction and torque increase of a gear set consisting of the motor gear (29), the intermediate gear (24) and the driving gear (20), then the valve shaft (34) is driven to drive the valve plate (33) to rotate through transmission of the driving arm (9) and the driving turntable (30), when the valve plate (33) rotates towards the opening reducing direction of the valve plate (33), the opening of the valve plate (33) is reduced, exhaust back pressure rises, at the moment, the diesel engine simultaneously increases oil injection to keep normal torque output of the diesel engine, and exhaust temperature can rise to reach a target temperature value required by aftertreatment catalytic conversion.

3. The diesel engine exhaust throttle valve according to claim 2, characterized in that: the butterfly valve (3) is set to be a structure which can receive the corner torque input transmitted by a clamping groove of a driving arm (9) of the actuator (2) through a claw of the driving turntable (30), overcome the tightening resistance of the return spring (31), and drive the valve shaft (34) and the valve plate (33) to rotate to a target angle position.

4. The diesel engine exhaust throttle valve according to claim 1 or 2, characterized in that: executor (2) include casing (10), business turn over water pipe (7), enclosing cover (5), enclosing cover sealing washer (28), motor (25), wave spring (26), motor flange (27), the shafting that gear train, intermediate gear axle (13) and drive gear axle (8) are constituteed, actuating arm (9), magnet (17) and PCB (14), PCB (14) include hall angular position sensor (15), electronic components and parts, motor pin (12), pin (11), contain the cooling water course in the casing.

5. The diesel engine exhaust throttle valve according to claim 1 or 2, characterized in that: the exhaust throttle valve of the diesel engine further comprises a connecting portion (4), the connecting portion (4) is set to be of a structure capable of being connected with the actuator (2) and the butterfly valve (3), the connecting portion (4) is simultaneously set to be of a structure capable of insulating heat and being flexibly connected, and the connecting portion (4) comprises a support (40), a sleeve (42), a steel wire gasket (41), a bolt and nut fastener I (43) and a bolt and nut fastener II (44).

6. The diesel engine exhaust throttle valve according to claim 1 or 2, characterized in that: outer cover (5) and casing (10) of diesel engine exhaust throttle valve's executor (2) between through snak link or outer cover screw (6) fastening connection, outer cover sealing washer (28) fluting embedding on outer cover (5), PPS or PBT are selected for use to the material of outer cover (5), add glass fibre, and outer cover (5) adopt injection moulding, and the material of outer cover sealing washer (28) selects for use the EPDM material.

7. The diesel engine exhaust throttle valve according to claim 4, characterized in that: the motor (25) is a direct current brush motor or a brushless motor, a wave spring (26) is additionally arranged between the motor (25) and the shell (10), an inner hole of a motor flange (27) is in interference press-fit with the outdoor wall surface of a bearing of the motor (25), and then the motor is rigidly connected to the shell (10) through a fastener.

8. The diesel engine exhaust throttle valve according to claim 6, characterized in that: wave spring (26) make by metal, motor flange (27) adopt the package to mould the molding process, the middle pin needle of connecting that imbeds, pin needle is used for connecting motor terminal and motor pin needle (12).

9. The diesel engine exhaust throttle valve according to claim 4, characterized in that: the motor (25) comprises a motor gear shaft, the motor gear shaft and the motor (25) are manufactured integrally, the intermediate gear shaft (13) is pressed on the actuator shell (10) in an interference mode, the driving gear (20) is assembled with the shell (10) through a bearing (23) and/or a shaft sleeve (21), the bearing (23) and/or the shaft sleeve (21) are designed in a sealing mode, and the bearing (23) and/or the shaft sleeve (21) are pressed in a shaft hole of the shell (10) in the interference mode.

10. The diesel engine exhaust throttle valve according to claim 1 or 2, characterized in that: magnet (17) and magnet seat (18) mould the integrated manufacturing shaping through the package, magnet seat (18) suit is fixed on drive gear axle (8) and with the help of pin (19), magnet (17) adopt the magnetic conductivity material to make, magnet seat (18) and pin (19) generally adopt injection moulding process shaping.

Technical Field

The invention belongs to the technical field of power assembly systems of diesel vehicles, and particularly relates to an exhaust throttle valve of a diesel engine.

Background

In recent years, as the emission regulations of diesel vehicles become more and more strict, the emission of pollutants at idle speed and low load is also required or is about to be required by corresponding pollutant limits. The catalytic efficiency of the existing diesel vehicle post-processing unit has certain exhaust temperature requirements, the catalytic efficiency is low when the exhaust temperature is low, the pollutant emission exceeds the standard, and the catalytic efficiency is particularly obvious under the working conditions of idle speed and low load.

The prior art routes have mainly used EGR technology, i.e. exhaust gas recirculation technology. And guiding part of exhaust gas in the exhaust manifold back to the EGR cooler, cooling to the target temperature, then guiding the cooled exhaust gas into the intake manifold, and finally enabling the cooled exhaust gas to enter the combustion chamber for combustion. The technical route can reduce the temperature of the combustion chamber, further reduce the generation amount of NOx, finally reduce the pollutant emission and meet the emission regulation requirements. However, the EGR system is composed of a valve, a cooler, a pipeline, a controller and the like, the system is complex, the cost is high, and the technical maturity and reliability are insufficient, so that the demand of the diesel engine cannot be effectively met.

Disclosure of Invention

The technical problem to be solved by the invention is as follows: aiming at the defects of the prior art, the exhaust throttle valve of the diesel engine is simple in structure, can accurately and timely reduce the valve plate opening of the throttle valve to improve the exhaust back pressure and improve the exhaust temperature by combining the oil injection strategy of the diesel engine when the diesel engine is in the working condition of low exhaust temperature such as idling and low load, and further improves the catalytic conversion efficiency of a post-processing unit, reduces the pollutant emission, and finally ensures that the emission meets the emission regulation requirement.

To solve the technical problems, the invention adopts the technical scheme that:

the invention relates to an exhaust throttle valve of a diesel engine, wherein a throttle valve body of the exhaust throttle valve of the diesel engine comprises an actuator and a butterfly valve, a motor is arranged in a shell of the actuator, a motor gear of the motor is meshed with a large gear of an intermediate gear, the large gear is meshed with a small gear of the intermediate gear, the small gear is meshed with a driving gear, the driving gear is connected with a driving gear shaft, the driving gear shaft is connected with a valve plate of the butterfly valve through a driving arm, a magnet is arranged above the driving gear, the magnet is arranged in a structure capable of feeding back an angular position signal of the driving gear shaft to a Hall angular position sensor in real time, the Hall angular position sensor is connected with an ECM of the whole vehicle, when the diesel engine is in idle speed or low-load working condition, the whole ECM is set to be capable of sending a valve plate opening command to the throttle valve body, thereby the motor of control choke valve body rotates for the motor drives the valve plate and reduces the structure of direction pivoted to the valve plate aperture.

When the motor drives the valve plate to rotate towards the valve plate opening reducing direction, the corner of the motor outputs corner torque after speed reduction and torque increase of a gear set formed by the motor gear, the intermediate gear and the driving gear, then the valve plate is driven to rotate by the driving shaft and the driving turntable through transmission of the driving arm and the driving turntable, when the valve plate rotates towards the valve plate opening reducing direction, the valve plate opening is reduced, exhaust back pressure is increased, at the moment, the diesel engine simultaneously increases oil injection to keep normal torque output of the diesel engine, and exhaust temperature can be increased to reach a target temperature value required by aftertreatment catalytic conversion.

The butterfly valve is set to be capable of receiving corner torque input transmitted by a clamping groove of a driving arm of the actuator through a driving turntable clamping jaw, overcoming the tightening resistance of the return spring and driving the valve shaft and the valve plate to rotate to a target angle position.

The executor include casing, business turn over water pipe, enclosing cover sealing washer, motor, wave spring, motor flange, gear train, intermediate gear axle and the shafting, actuating arm, magnet and the PCB that drive gear axle is constituteed, PCB includes hall angular position sensor, electronic components, motor pin needle, pin needle, contains cooling water course in the casing.

The exhaust throttle valve of the diesel engine further comprises a connecting portion, the connecting portion is set to be of a structure capable of being connected with an actuator and a butterfly valve, the connecting portion is simultaneously set to be of a structure capable of insulating heat and being flexibly connected, and the connecting portion comprises a support, a sleeve, a steel wire washer, a bolt-nut fastener I and a bolt-nut fastener II.

The outer cover of the actuator of the diesel engine exhaust throttle valve is fixedly connected with the shell through a spring fastener or an outer cover screw, the outer cover sealing ring is embedded into the outer cover in a slotted mode, PPS or PBT is selected as the material of the outer cover, glass fibers are added, the outer cover is formed by injection molding, and the EPDM material is selected as the material of the outer cover sealing ring.

The motor is a direct current brush motor or a brushless motor, a wave spring is additionally arranged between the motor and the shell, an inner hole of a motor flange is in interference press-fit with the outdoor wall surface of a bearing of the motor, and then the motor is rigidly connected to the shell through a fastener.

The wave spring be made by metal material, the motor flange adopts the package to mould the molding process, the middle embedding connection pin needle, pin needle is used for connecting motor terminal and motor pin needle.

The motor comprises a motor gear shaft, the motor gear shaft and the motor are integrally manufactured, an intermediate gear shaft is pressed on the actuator shell in an interference fit mode, the driving gear is assembled with the shell through a bearing and/or a shaft sleeve, the bearing shaft sleeve is designed in a sealing mode, and the bearing shaft sleeve is arranged in a shaft hole of the shell in the interference fit mode.

Magnet and magnet seat mould integrated manufacturing shaping through the package, the magnet seat suit is fixed with the help of the pin on the drive gear axle, magnet adopts the magnetic conductivity material to make, magnet seat and pin generally adopt the injection moulding process shaping.

By adopting the technical scheme of the invention, the following beneficial effects can be obtained:

according to the exhaust throttle valve of the diesel engine, under the high-load working condition of a diesel vehicle, the requirements for improving exhaust back pressure and exhaust temperature are not met, and the valve plate of the throttle valve body is in the full-open position, so that the power performance of the whole vehicle is not affected. When the diesel vehicle runs under the idle speed or low-load working condition, the exhaust temperature of the engine generally cannot reach the target temperature value required by the catalytic conversion of the post-processing unit. In such a case, the problems described in the background art may occur. Therefore, the application is improved, when a diesel vehicle runs under the idle speed or low-load working condition, the whole vehicle ECM calculates and sends a valve plate opening command to a throttle valve body (exhaust throttle valve), the motor is controlled to rotate, the motor rotates to drive the valve plate to rotate towards the direction that the valve plate opening is reduced, the valve plate outputs the rotation angle torque after speed reduction and torque increase of the gear set, the valve shaft and the valve plate are driven to rotate through connection of the driving arm and the driving turntable, the valve plate opening is reduced, exhaust back pressure is increased, the diesel engine simultaneously keeps normal torque output through multi-oil injection, the exhaust temperature of the engine rapidly increases to reach the target temperature value required by aftertreatment catalytic conversion, and therefore pollutant emission is reduced, and the requirements of environmental protection regulations are met. When the load of the whole vehicle rises and the normal exhaust temperature is enough to maintain the high-efficiency catalytic conversion of the post-processing unit, the valve plate of the throttle valve body returns to the full-open position under the control of the ECM of the whole vehicle or under the action of the return spring, and the power output of the whole vehicle is not influenced any more. When the diesel engine is in the working condition of low exhaust temperature such as idling and low load, the exhaust throttle valve of the diesel engine can accurately and timely reduce the opening of the valve plate of the throttle valve to improve the exhaust back pressure and improve the exhaust temperature by combining the fuel injection strategy of the diesel engine, thereby improving the catalytic conversion efficiency of the post-treatment unit, reducing the pollutant emission and finally ensuring that the emission meets the emission regulation requirement.

Drawings

The contents of the description and the references in the drawings are briefly described as follows:

FIG. 1 is a schematic view showing an assembly structure of an exhaust throttle valve of a diesel engine according to the present invention;

FIG. 2 is a schematic cross-sectional view of an exhaust throttle valve of a diesel engine according to the present invention;

FIG. 3 is a schematic diagram of an actuator for an exhaust throttle valve of a diesel engine according to the present invention;

FIG. 4 is a schematic illustration in partial cross-sectional view of an actuator for an exhaust throttle valve of a diesel engine according to the present invention;

FIG. 5 is a schematic structural view of a butterfly valve of an exhaust throttle valve of a diesel engine according to the present invention;

FIG. 6 is a schematic cross-sectional view of a butterfly valve of an exhaust throttle valve of a diesel engine according to the present invention;

FIG. 7a is a schematic view showing the structure of a connecting portion of an exhaust throttle valve of a diesel engine according to the present invention;

FIG. 7b is a schematic view showing the structure of the connecting portion of the exhaust throttle valve of the diesel engine according to the present invention;

in the drawings, the reference numbers are respectively: 1. a throttle body; 2. an actuator; 3. a butterfly valve; 4. a connecting portion; 5. an outer cover; 6. an outer cover screw; 7. a water inlet pipe and a water outlet pipe; 8. a drive gear shaft; 9. a drive arm; 10. a housing; 11. a pin; 12. a pin needle of the motor; 13. an intermediate gear shaft; 14. a PCB; 15. a Hall angle position sensor; 16. a self-tapping screw; 17. a magnet; 18. a magnet base; 19. a pin; 20. a drive gear; 21. a shaft sleeve; 22. a thrust washer; 23. a bearing; 24. an intermediate gear; 25. a motor; 26. a wave spring; 27. a motor flange; 28. an outer cover sealing ring; 29. a motor gear; 30. driving the turntable; 31. a return spring; 32. a butterfly valve housing; 33. a valve plate; 34. a valve shaft; 35. an upper bushing cover; 36. an upper bushing; 37. sealing gaskets; 38. a lower bushing; 39. a lower bushing cover; 40. a support; 41. a wire washer; 42. a sleeve; 43. a bolt and nut fastener I; 44. bolt nut fastener II.

Detailed Description

The following detailed description of the embodiments of the present invention, such as the shapes and structures of the components, the mutual positions and connection relations among the components, the functions and operation principles of the components, will be made by referring to the accompanying drawings and the description of the embodiments:

as shown in the attached figures 1-6, the invention is a diesel engine exhaust throttle valve, the throttle valve body 1 of the diesel engine exhaust throttle valve comprises an actuator 2 and a butterfly valve 3, a motor 25 is arranged in a shell 10 of the actuator 2, a motor gear 29 of the motor 25 is meshed with a large gear of an intermediate gear 24, the large gear is meshed with a small gear of the intermediate gear 24, the small gear is meshed with a driving gear 20, the driving gear 20 is connected with a driving gear shaft 8, the driving gear shaft 8 is connected with a valve plate 33 of the butterfly valve 2 through a driving arm 9, a magnet 17 is arranged above the driving gear 20, the magnet 17 is arranged to feed back an angular position signal of the driving gear shaft 8 to a structure of a Hall angular position sensor 15 in real time, the Hall angular position sensor 15 is connected with a whole vehicle ECM, when the diesel engine is in an idling state or a low-load state, the whole vehicle ECM is arranged to be capable of sending an opening degree command to the throttle valve body 1, thereby controlling the motor 25 of the throttle body 1 to rotate, so that the motor 25 drives the valve plate 33 to rotate towards the opening reducing direction of the valve plate 33. The structure provides an improvement scheme aiming at the defects in the prior art. In the diesel vehicle operation process, especially under the high load operating mode, do not promote the demand of exhaust back pressure and row temperature, the valve plate 33 of choke valve body 1 is in full open position this moment, can not influence whole car dynamic performance. When the diesel vehicle runs under the idle speed or low-load working condition, the exhaust temperature of the engine generally cannot reach the target temperature value required by the catalytic conversion of the post-processing unit. In such a case, the problems described in the background art may occur. Therefore, the application is improved, when the diesel vehicle runs under the idle speed or low-load working condition, the whole vehicle ECM calculates and sends a valve plate opening command to the throttle valve body (exhaust throttle valve) 1, the motor is controlled to rotate, the motor 25 rotates to drive the valve plate to rotate towards the direction of reducing the valve plate opening, the valve plate rotates in the speed reduction and torque increase mode through the gear set, the rotating angle torque is output, the valve shaft 34 and the valve plate 33 are driven to rotate through the connection of the driving arm 9 and the driving rotary disc 30, the valve plate 33 opening is reduced, the exhaust back pressure is increased, the diesel engine simultaneously keeps normal torque output through multi-fuel injection, the exhaust temperature of the engine rapidly rises to reach the target temperature value required by aftertreatment catalytic conversion, and therefore pollutant emission is reduced, and the requirement of environmental protection regulations is met. When the load of the whole vehicle rises and the normal exhaust temperature is enough to maintain the high-efficiency catalytic conversion of the aftertreatment unit, the valve plate 33 of the throttle valve body returns to the full-open position under the control of the ECM of the whole vehicle or under the action of the return spring 31, and the power output of the whole vehicle is not influenced any more. The exhaust throttle valve of the diesel engine is simple in structure, and can accurately and timely reduce the opening degree of a valve plate of the throttle valve to improve exhaust back pressure and improve exhaust temperature by combining a diesel engine oil injection strategy when the diesel engine is in a working condition with low exhaust temperature such as idling and low load, so that the catalytic conversion efficiency of a post-treatment unit is improved, pollutant emission is reduced, emission is finally ensured to meet the emission regulation requirement, and the performance of the engine is improved.

When the motor 25 drives the valve plate 33 to rotate towards the opening reducing direction of the valve plate 33, the rotation angle of the motor 25 outputs rotation angle torque after speed reduction and torque increase of a gear set consisting of the motor gear 29, the intermediate gear 24 and the driving gear 20, and then the valve plate 33 is driven to rotate by the driving shaft 34 through transmission of the driving arm 9 and the driving turntable 30, when the valve plate 33 rotates towards the opening reducing direction of the valve plate 33, the opening of the valve plate 33 is reduced, exhaust back pressure is increased, at the moment, oil injection is simultaneously increased for keeping normal torque output of the diesel engine, and exhaust temperature can be increased to reach a target temperature value required by aftertreatment catalytic conversion. Above-mentioned structure, when diesel vehicle operation is under idle speed or low-load operating mode, interfere, rotate through control valve plate 33, valve plate 33 aperture reduces, and exhaust back pressure rises, and diesel engine rethread is many oil spout simultaneously and is kept normal torque output, and the row's of engine temperature rises rapidly to reaching the required target temperature value of aftertreatment catalytic conversion, like this for the pollutant discharge reduces, reaches environmental protection regulation requirement.

The butterfly valve 3 is set to be a structure which can receive the corner torque input transmitted by the clamping groove of the driving arm 9 of the actuator 2 through the clamping jaw of the driving turntable 30, overcome the tightening resistance of the return spring 31 and drive the valve shaft 34 and the valve plate 33 to rotate to the target angle position. With the above configuration, the exhaust back pressure is increased by reducing the flow area of the exhaust flow passage of the butterfly valve housing 32. The butterfly valve 3 includes a butterfly valve housing 32, a valve shaft 34, a valve plate 33, a bush (36/38) (1 on each of the top and bottom), a bush cover (35/39) (1 on each of the top and bottom), a seal gasket 37, a return spring 31, and a drive disk 30. The drive disk 30, the valve shaft 34 and the valve plate 33 are rigidly connected, typically by welding. The butterfly valve 3 is a normally open valve, and exhaust can flow freely when the valve plate 33 is fully opened; when the opening degree of the valve plate 33 is reduced, the exhaust gas flow is restricted, and the exhaust back pressure at the same flow rate is significantly increased. The upper and lower shaft holes of the butterfly valve housing 32 need to be sealed. The two bushings (36/38) of the butterfly valve 3 are assembled with the shaft hole of the shell 32 in an interference press fit mode, the diameter of the upper end of the valve shaft 34 is thin and penetrates through the upper bushing 36, the diameter of the lower end of the valve shaft 34 is thick and penetrates through the lower bushing 38, and the side wall surface of the valve shaft 34 keeps small clearance fit with the inner walls of the two bushings (36/38). The lining (36/38) is made of graphite, soft copper, steel and other materials, preferably graphite, and is beneficial to the design of friction reduction and noise reduction because the graphite has the characteristic of self-lubrication; the valve shaft 34 is made of wear-resistant and high-temperature-resistant stainless steel; the butterfly valve housing 32 is cast and molded by using a high-temperature resistant stainless steel material. Two lining cover (35/39) press-fit to the corresponding casing 32 shaft hole earlier, and the valve shaft 34 upper end is worn out from upper liner cover 35 hole, and both keep little clearance fit, and upper liner cover 35 can not influence the rotation of valve shaft 34, also can not produce the friction noise, then can adopt welding (preferred laser welding, the welding outward appearance is pleasing to the eye, and welding temperature is low, and the heat influence to parts is little on every side) or processes such as spin riveting carry out the outer edge and seal, prevent that high temperature exhausts and leak. The lower shaft hole can also adopt a blind hole type, and the lower bushing cover 39 is omitted. The two lining covers (35/39) are made of high-temperature resistant stainless steel.

The sealing between the upper end of the valve shaft 34 of the butterfly valve 3 and the inner hole of the upper bushing cover 35 needs to be realized by pressing and attaching the sealing gasket 37 and the step surface of the valve shaft 34, the upper part of the valve shaft 34 is welded with the driving turntable 30, the laser welding is preferred, the welding appearance is attractive, the welding temperature is low, and the heat influence on surrounding parts is small. The return spring 31 is sleeved on the outer wall surface of an upper shaft hole of the butterfly valve shell 32, a supporting platform of the butterfly valve shell 32 is arranged at the lower part of the butterfly valve shell, a limiting structure is fixed on the butterfly valve shell 32 on the lower support arm of the return spring 31, the upper support arm is clamped in the limiting structure arranged on the driving turntable 30, a certain axial pretightening force is kept after the return spring 31 is installed, the valve shaft 34 is lifted upwards, the step surface of the valve shaft 34 is tightly pressed on the inclined plane of the sealing gasket 37, and the leakage amount of high-temperature exhaust is minimized. The step surface of the valve shaft 34 is preferably designed in a spherical surface, and the sealing gasket 37 needs to be provided with a bevel plane at a corresponding position, so that the sealing position can be developed into a surface sealing from an initial linear sealing after a period of operation, and the sealing effect is better along with the increase of the abrasion loss of an abrasion surface. The gasket seal 37 is preferably made of a wear resistant and high temperature resistant stainless steel. The valve shaft 34 and the valve plate 33 are welded together by laser welding or argon arc welding. The return spring 31 is installed to maintain a certain pre-tightening force in the torsion direction, and the valve plate 33 is in a normally open position under the matching of the limiting structure of the shell 32 and the limiting structure of the driving turntable 30. The valve-off direction is the tightening direction of the return spring 31. Valve plate 34 is usually made of high temperature resistant stainless steel by casting, and return spring 31 is usually made of SUS301, SUSU304 or X718, X750 by bending.

Executor 2 include casing 10, business turn over water pipe 7, enclosing cover 5, enclosing cover sealing washer 28, motor 25, wave spring 26, motor flange 27, gear train, intermediate gear axle 13 and the shafting, actuating arm 9, magnet 17 and PCB14 that drive gear axle 8 constitutes, PCB14 includes hall angular position sensor 15, electronic components, motor pin 12, pin 11, contains the cooling water course in the casing. Hall angle position sensor 15, supporting electronic components (like electric capacity, inductance, diode etc.), motor pin 12 and pin 11 can weld on a PCB14, install PCB14 on enclosing cover 5 with self-tapping screw 16 again, need set up the screw post that corresponds the screw hole site on enclosing cover 5, the position that the induction field on Hall angle position sensor 15 needs just to magnet 17 center, and the clearance between magnet 17 also need accord with the design requirement. The other scheme is that a conductive wire frame (not shown in the drawing) is used as an insert of the outer cover 5 to be integrally injection-molded, then the Hall angle position sensor 15, matched electronic components (such as a capacitor, an inductor, a diode and the like), the motor pin 12 and the pin 11 are welded, and finally the outer cover 5 is fixed by glue pouring, so that the investment of the PCB14 and the tapping screw 16 is saved.

As shown in fig. 7a and 7b, the exhaust throttle valve of the diesel engine further comprises a connecting part 4, the connecting part 4 is configured to be capable of connecting the actuator 2 and the butterfly valve 3, the connecting part 4 is configured to be capable of being thermally insulated and flexibly connected, and the connecting part 4 comprises a bracket 40, a sleeve 42, a wire washer 41, a bolt-nut fastener i 43 and a bolt-nut fastener ii 44. The structure, the connecting part 4 plays a thermal insulation role mainly depends on the design of the structure and the size of the bracket 40, in addition, the contact structure of the driving arm 9 of the actuator and the driving turntable 30 of the butterfly valve is small, and the influence of heat transfer is considered to be minimum; the flexible connection is mainly realized by a steel wire gasket 41, so that vibration and noise can be reduced.

The outer cover 5 and the shell 10 of the actuator 2 of the exhaust throttle valve of the diesel engine are fixedly connected through a spring fastener or an outer cover screw 6, an outer cover sealing ring 28 is embedded in the outer cover 5 in a groove mode, PPS or PBT is selected as the material of the outer cover 5, glass fibers are added, the outer cover 5 is formed by injection molding, and the outer cover sealing ring 28 is made of EPDM. In the above structure, the structural form of the outer cover sealing ring 28 can be an O-shape, an X-shape or other special-shaped design. The outer cover 5 of the actuator is made of PPS or PBT, glass fiber is added, and injection molding is adopted; the outer cap seal 28 is typically EPDM. The actuator shell 10 is also provided with a water path design, the water path is generally formed in the shell 10 in a die-casting mode, the die-casting aluminum material is selected and is provided with the water inlet and outlet pipe 7, the water inlet and outlet pipe 7 and the shell 10 are required to be sealed, a sealing ring is generally adopted or the water inlet and outlet pipe 7 is directly pressed on the shell 10 and is welded and fastened, laser welding is preferred, the welding appearance is attractive, and the integral welding strength is reliable.

The motor 25 is a direct current brush motor or a brushless motor, a wave spring 26 is additionally arranged between the motor 25 and the shell 10, an inner hole of a motor flange 27 is in interference press fit with the outdoor wall surface of a bearing of the motor 25, and then the motor flange is rigidly connected to the shell 10 through a fastener. In the structure, the positioning of the motor 25 is completed by the motor flange 27 and the structure on the shell 10, and the positioning of the other end of the motor 25 is completed by the bearing outdoor wall surface and the inner cylindrical surface processed at the corresponding position of the shell 10.

The wave spring 26 is made of metal material, the motor flange 27 is formed by plastic-coated molding, a pin (not shown in the drawing) is embedded in the middle of the motor flange and is connected with a pin, and the pin is used for connecting a motor terminal (not shown in the drawing) and the motor pin 12. Alternatively, the shaft extension may be fixedly mounted directly to the housing 10 by means of a resilient motor flange (not shown) and fasteners (not shown).

The gear set (power train) (29/24/20) adopts straight cylindrical gear drive design, and also can adopt helical cylindrical gear drive design or other drive types, which mainly depends on the space arrangement requirement. The selection of the gear ratio and the number of the stages of the gear set mainly depends on the design of two aspects of the selection of the type (motor characteristic curve) of the motor 25 and the output torque requirement, and the current scheme in the drawing is two-stage spur gear transmission, and the gear ratio is 36.5. The motor gear 29 is generally press-fitted on the shaft of the motor 25 in an interference manner, the position of the motor gear 29 is accurately positioned by a limiting tool during press-fitting, and the motor gear 29 is generally manufactured and molded by adopting a powder metallurgy process. The intermediate gear 24 is directly in small clearance fit with the intermediate gear shaft 13, the position of the intermediate gear 24 is accurately positioned by means of the fit of the lower end face of the gear 24 and a corresponding plane of the shell 10, the intermediate gear 24 is generally manufactured by adopting an injection molding process, the materials are selected from PA46, PA66, PPA and the like, and a proper amount of glass fiber and wear-resistant material PTFE are added. The driving gear 20 is usually designed with sector teeth, and both sides of the driving gear 20 are limited by the limiting structures arranged at the corresponding positions of the shell 10, so that the maximum rotation angle of the driving gear 20 (i.e. the driving shaft 8 and the driving arm 9) is determined, and the driving gear 20 is usually welded with the driving gear shaft 8, preferably by laser welding, and has low welding temperature, small welding deformation and small heat influence on peripheral parts. The driving gear 20 adopts a plastic-coated molding process, and the materials can be selected from PA46, PA66, PPS and the like, and a proper amount of glass fiber is added; the built-in insert (not shown in the drawings) is made of a metal material.

The motor 25 comprises a motor gear shaft, the motor gear shaft and the motor 25 are manufactured integrally, the intermediate gear shaft 13 is pressed on the actuator shell 10 in an interference fit mode, the driving gear 20 is assembled with the shell 10 through a bearing 23 and/or a shaft sleeve 21, the bearing shaft sleeve is designed in a sealing mode (for example, the bearing 23 is provided with a sealing ring) and is pressed in a shaft hole of the shell 10 in the interference fit mode. The accurate positioning of the driving gear 20 is completed by reducing the vertical movement of the driving gear shaft 8, the vertical movement of the driving gear shaft 8 is controlled mainly by a thrust washer 22, the thrust washer 22 is clamped on the driving gear shaft 8, the upper surface position of the thrust washer 22 is limited by a limiting structure in a shaft hole of the actuator shell 10, and the lower surface position is limited by the upper end surface of a bearing 23/shaft sleeve 21 (the scheme in the drawing is the bearing 23), so that the vertical movement of the driving gear shaft 8 is small, and the position of the driving gear 20 is accurately controlled. The driving arm 9 is firstly pressed on the driving gear shaft 8 and then welded and fixed, preferably laser welding, and has low welding temperature, small welding deformation and small heat influence on peripheral parts. The intermediate gear shaft 13 and the drive gear shaft 8 are made of metal.

The magnet 17 and the magnet seat 18 are integrally manufactured and formed through plastic coating, the magnet seat 18 is sleeved on the driving gear shaft 8 and is fixed through the pin 19, the magnet 17 is made of a magnetic conductivity material, and the magnet seat 18 and the pin 19 are generally formed through an injection molding process. Or the magnet 17 and the driving gear shaft 8 are integrally formed, and the input of the magnet seat 18 and the pin 19 is omitted. The magnet 17 is typically made of a magnetically permeable material, and the magnet holder 18 and the pin 19 are typically formed by an injection molding process.

According to the exhaust throttle valve of the diesel engine, under the high-load working condition of a diesel vehicle, the requirements for improving exhaust back pressure and exhaust temperature are not met, and the valve plate of the throttle valve body is in the full-open position, so that the power performance of the whole vehicle is not affected. When the diesel vehicle runs under the idle speed or low-load working condition, the exhaust temperature of the engine generally cannot reach the target temperature value required by the catalytic conversion of the post-processing unit. In such a case, the problems described in the background art may occur. Therefore, the application is improved, when a diesel vehicle runs under the idle speed or low-load working condition, the whole vehicle ECM calculates and sends a valve plate opening command to a throttle valve body (exhaust throttle valve), the motor is controlled to rotate, the motor rotates to drive the valve plate to rotate towards the direction that the valve plate opening is reduced, the valve plate outputs the rotation angle torque after speed reduction and torque increase of the gear set, the valve shaft and the valve plate are driven to rotate through connection of the driving arm and the driving turntable, the valve plate opening is reduced, exhaust back pressure is increased, the diesel engine simultaneously keeps normal torque output through multi-oil injection, the exhaust temperature of the engine rapidly increases to reach the target temperature value required by aftertreatment catalytic conversion, and therefore pollutant emission is reduced, and the requirements of environmental protection regulations are met. When the load of the whole vehicle rises and the normal exhaust temperature is enough to maintain the high-efficiency catalytic conversion of the post-processing unit, the valve plate of the throttle valve body returns to the full-open position under the control of the ECM of the whole vehicle or under the action of the return spring, and the power output of the whole vehicle is not influenced any more. When the diesel engine is in the working condition of low exhaust temperature such as idling and low load, the exhaust throttle valve of the diesel engine can accurately and timely reduce the opening of the valve plate of the throttle valve to improve the exhaust back pressure and improve the exhaust temperature by combining the fuel injection strategy of the diesel engine, thereby improving the catalytic conversion efficiency of the post-treatment unit, reducing the pollutant emission and finally ensuring that the emission meets the emission regulation requirement.

The present invention has been described in connection with the accompanying drawings, and it is to be understood that the invention is not limited to the specific embodiments disclosed, but is intended to cover various modifications, changes and equivalents of the embodiments of the invention, and its application to other applications without departing from the spirit and scope of the invention.