CN205154448U - Diesel engine egr valve - Google Patents
Diesel engine egr valve Download PDFInfo
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- CN205154448U CN205154448U CN201520940948.5U CN201520940948U CN205154448U CN 205154448 U CN205154448 U CN 205154448U CN 201520940948 U CN201520940948 U CN 201520940948U CN 205154448 U CN205154448 U CN 205154448U
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- valve body
- gear
- diesel engine
- spool
- teeth
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Abstract
The utility model discloses a diesel engine EGR valve, including controlling means, valve body and locate the transmission in the valve body installation cavity, the lower extreme of valve body is equipped with the air inlet, and one side of valve body is equipped with the gas vent, it still includes makes rotary motion's drive shaft and fixes the case that just is used for controlling the gas vent aperture at the drive shaft lower extreme through gear drive in the valve body, the case is equipped with and cooperatees so that the gas vent is opened or sealed cylindrical side with the valve body inner chamber, and the case is equipped with the waste gas diversion channels who is the arcuation who runs through one side perisporium from the case lower extreme, waste gas diversion channels's one end is established and is used for the first connector that is linked together with the air inlet, the second connector that can be linked together with the gas vent is established to waste gas diversion channels's the other end. The utility model discloses response speed is fast, and the flow resistance is little, sealing performance good, exhaust gas flow control is linear good.
Description
Technical field
The utility model relates to this diesel engine exhaust recirculating technique field, particularly a kind of diesel engine EGR valve.
Background technique
Diesel exhaust recirculation ExhaustGasrecirculation, EGR is in working process of diesel engine, a part of waste gas is led back gas handling system, enters the method that cylinder interior participates in combustion process again with fresh air after mixing, its Main Function is used to reduce diesel engine oxynitride NO
xdischarge amount.Under high-temperature oxygen-enriched environment, nitrogen and oxygen generation oxidation reaction easily produce NO
x, because the air fuel ratio of diesel engine is large, oxygen has residue, so diesel engine can produce a large amount of NO in combustion
xnoxious gas emission.In working process of diesel engine, after appropriate waste gas being introduced cylinder again by recirculation, on the one hand, waste gas produces diluting effect to the fresh air in cylinder, can reduce the concentration of oxygen in cylinder; On the other hand, because the main component in waste gas is H
2o, CO
2deng the gas that specific heat ratio is larger, waste gas can absorb the heat that more burning produces in combustion, can reduce the maximum combustion temperature in cylinder.Therefore, adopt EGR to destroy and generate NO
xthe high-temperature oxygen-enriched condition relied on, effectively can suppress the NO of diesel engine
xdischarge, one of current egr system important reprocessing standard configuration having become diesel engine qualified discharge.Increasingly strict along with diesel emission statute of limitation, EGR technology will obtain applying more and more widely on diesel engine for automobile.
In working process of diesel engine, different operating mode can have different requirements by the size that EGR rate represents to EGR gas capacity of reflux, therefore, the change along with diesel engine condition needs adjustment exhaust gas recirculation amount in time, to meet the requirement of diesel engine best power performance, Economy and exhaust index.In diesel engine EGR system, EGR valve is the Primary Component of adjustment exhaust gas recirculation amount, and its performance index mainly comprise the aspects such as dynamic response performance, the linearity of flow and functional reliability.
Diesel engine EGR system mainly adopts vacuum diaphragm chip or electric controlled vacuum diaphragm type EGR valve to control the capacity of reflux of waste gas, but due to vacuum diaphragm chip EGR valve have that poor dynamic, speed of response are slow, flow control accuracy and EGR rate realize the shortcomings such as narrow range, therefore can not adapt to the requirement of the more and more stricter emission control regulations of diesel engine well, be tending towards superseded.Electrodynamic type EGR valve utilizes passing ratio electromagnet, direct current generator or stepper motor to coordinate reducing gear to regulate EGR valve core aperture, and control accuracy is high, fast response time, and therefore electrodynamic type EGR valve becomes the development trend of main flow.At present, on domestic diesel engine, the electric EGR valve of adapted mainly contains two kinds of structural types, one is valve block axial motion type EGR valve, the flow area changing EGR valve is moved axially by control valve sheet, regulate exhaust gas flow, in use there is the easy carbon distribution of spool in this EGR valve, the problem that control performance progressively worsens; Two is register type EGR valve, rotates change flow area in the housing by controlling valve block, and major defect is that flow resistance is large, and the poor linearity between exhaust gas flow and spool aperture, is difficult to the accurate control realizing exhaust gas flow.In the exploitation of electric EGR valve, Li Ze equality people discloses a kind of rotary EGR valve [patent No.: 201210542381.7], changes spool flow area, realize the regulation and control of exhaust gas flow by control valve core axial-rotation.This valve utilizes the plane contact of flap and valve seat and realizes plane sealing by preloading spring, but analyzes the effect that the preloading spring of discovery between its valve body and valve rod does not have poppet stem, and thus, this mechanism can not ensure the sealing of valve; In addition, from the angle of engineering fluid mechanics, the waste gas circulation of this valve presents irregularly shaped, there are larger flow losses.
Model utility content
Technical problem to be solved in the utility model is: provide a kind of fast response time, the diesel engine EGR valve that flow resistance is little, good seal performance, exhaust gas flow control linear are good.
The technical scheme in the invention for solving the above technical problem is: a kind of diesel engine EGR valve, comprise control gear, valve body and the transmission device be located in valve body installation cavity, the lower end of described valve body is provided with suction port, and the side of described valve body is provided with relief opening, it is also comprised the live axle that rotated in valve body by actuator drives and is fixed on live axle lower end and spool for controlling relief opening aperture, described spool is provided with and matches to make described Exhaust Open or the cylindrical sides of sealing with body cavity, and described spool is provided with the waste gas drainage channel in arcuation running through side perisporium from spool lower end, the first connection mouth for being connected with described suction port is established in one end of described waste gas drainage channel, the other end of described waste gas drainage channel establishes second connection mouth that can be connected with described relief opening.
Compared with prior art, the utility model has the advantage of: the live axle that EGR valve of the present utility model is rotated by actuator drives in valve body and the spool being fixed on live axle lower end realize the control of the aperture to relief opening, core is provided with the cylindrical sides matching to make Exhaust Open or sealing with body cavity, and spool is provided with the waste gas drainage channel in arcuation running through side perisporium from spool lower end, the first connection mouth for being connected with suction port is established in one end of waste gas drainage channel, the other end of waste gas drainage channel establishes second connection mouth that can be connected with relief opening.Along with diesel engine condition change is opened greatly or turns down, the self-cleaning action that spool turns to change to produce effectively can remove the carbon distribution that spool place produces, and prevents spool jam and exhaust gas flow from changing because of carbon distribution, and fast response time, flow resistance is little.And adopting the form of valve element circle cylindrical lateral surface sealing, sealing effect is also fine, and exhaust gas flow control linear is good, can solve the shortcoming of the EGR valve of above-mentioned prior art.
As preferably, described valve body is made up of split type upper valve body and lower valve body, and the upper end of described upper valve body is provided with upper cover; And be provided with sealing thermal insulating pad between described upper valve body and lower valve body; Described spool is placed in the cavity of described lower valve body completely, and the lower end of described lower valve body is located at by described suction port, and described relief opening is located at the side of described lower valve body.Like this, upper valve body and lower valve body are that split is arranged, and waste gas, by means of only the suction port of lower valve body and relief opening, effectively trap heat can be transmitted to upper valve body, prevent motor and other electronic device from causing damage because of overheated.
As preferably, between described lower valve body and described spool, be interval with multiple lip ring.Like this, can effectively prevent waste gas from revealing.
As preferably, described transmission device comprises brushless electric machine and second gear reduction unit structure, described second gear reduction unit structure comprises the reduction gear be installed on brushless electric machine output shaft, the first gear be meshed with reduction gear, the teeth-missing gear that be arranged at second gear transition gear axle on and with second gear be meshed same with the first gear, and described teeth-missing gear is fixedly sleeved on described live axle.Like this, closely, and driving moment is large for the structure of transmission device.
As preferably, be provided with Returnning spring between described teeth-missing gear and described valve body, the upper end of described Returnning spring is fixed on described teeth-missing gear, and the lower end of described teeth-missing gear is fixed on described live axle.Like this, the power that return spring force and motor act on spool balances each other, and can maintain the stable unlatching of spool, and when motor power-off, the power that motor acts on spool disappears, and Returnning spring drives valve core reset.
As preferably, the periphery of described teeth-missing gear side is provided with limiting stopper, and described valve body is provided with the first limit point for matching with described limiting stopper and the second limit point.Like this, the cooperation of limiting stopper and two limit points can be utilized to carry out spacing to the rotation angle of teeth-missing gear, be and carry out spacing to the rotation angle of spool.
As preferably, described transition gear axle is fixed on valve body, and on transition gear axle, fit is provided with copper sheathing.
As preferably, on described live axle, fit is provided with axle and the axle sleeve for positioning the axial position of teeth-missing gear, described body cavity is provided with the assembly department for matching with the outer ring of bearing, and the inner ring of described bearing is sleeved on described live axle; Upper end and the described teeth-missing gear of described axle sleeve offset, and lower end and the described bearing of described axle sleeve offset.Like this, utilize axle sleeve to position the axial position of teeth-missing gear well, the setting of bearing then makes the rotation of live axle more smooth.
As preferably, between described live axle and upper valve body, fit is provided with orienting cover, be equipped with the first heat-insulating and sealing circle between described orienting cover and upper valve body, between described orienting cover and live axle, interval is equipped with the second heat-insulating and sealing circle and the 3rd heat-insulating and sealing circle.Like this, good seal action can be played by setting sleeve and multiple heat-insulating and sealing circle, can prevent motor and other electronic device from causing damage because of overheated.
As preferably, described live axle is also provided with rotation angle for detecting spool to determine the fixed cover with the photoelectric coded disk be electrically connected with control gear of the aperture size of spool.Like this, utilize the pivotal position of photoelectric encoder to live axle to detect, there is fast response time, the feature that position detection accuracy is high.
Accompanying drawing explanation
Fig. 1 is one of cross-section structure view of the utility model diesel engine EGR valve.
Fig. 2 is the cross-section structure view two of the utility model diesel engine EGR valve.
Fig. 3 is the internal structure schematic diagram of the utility model diesel engine EGR valve.
Fig. 4 is the perspective view of the utility model diesel engine EGR valve.
Fig. 5 is the perspective view (removing upper cover) of diesel engine EGR valve of the present invention.
In Fig. 1-5: 1 time valve body, 1.1 suction port, 1.2 relief opening, 2 spools, 2.1 waste gas drainage channels, 2.2 first connection mouths, 2.3 second connection mouths, 3 sealing thermal insulating pads, 4 first heat-insulating and sealing circles, 5 first heat-insulating and sealing circles, 6 orienting covers, 7 the 3rd heat-insulating and sealing circles, 8 bearings, 9 axle sleeves, 10 Returnning springs, 11 fixed covers, 12 upper covers, 13 teeth-missing gear, 13.1 limiting stoppers, 14 upper valve bodies, 15 live axles, 16 transition gear axles, 17 copper sheathings, 18 second gears, 19 reduction gear, 20 brushless electric machines, 21 first gears, 22 first limit points, 23 second limit points.
Embodiment
Below in conjunction with accompanying drawing, embodiment of the present utility model is further described.
As shown in accompanying drawing 1-5, a kind of diesel engine EGR valve, comprise control gear, valve body and the transmission device be located in valve body installation cavity, the lower end of described valve body is provided with suction port 1.1, and the side of described valve body is provided with suction port 1.1, it is also comprised the live axle 15 that rotated in valve body by actuator drives and is fixed on live axle 15 lower end and spool 2 for controlling relief opening 1.2 aperture, described spool 2 is provided with the cylindrical sides matching with body cavity to make described relief opening 1.2 open or seal, and described spool 2 is provided with the waste gas drainage channel 2.1 in arcuation running through side perisporium from spool 2 lower end, the first connection mouth 2.2 for being connected with described suction port 1.1 is established in one end of described waste gas drainage channel 2.1, the other end of described waste gas drainage channel 2.1 establishes second connection mouth 2.3 that can be connected with described relief opening 1.2.
The cross section of the first connection mouth 2.2 and the second connection mouth 2.3 and suction port 1.1, relief opening 1.2 is circle, and the matching size of the first connection mouth 2.2 and suction port 1.1, second connection mouth 2.3 and relief opening 1.2.
Described valve body is made up of split type upper valve body 14 and lower valve body 1, and the upper end of described upper valve body 14 is provided with upper cover 12; And between described upper valve body 14 and lower valve body 1, be provided with sealing thermal insulating pad 3; Described spool 2 is placed in the cavity of described lower valve body 1 completely, and the lower end of described lower valve body 1 is located at by described suction port, and described relief opening is located at the side of described lower valve body 1.
Multiple lip ring is interval with between described lower valve body 1 and described spool 2.
Described transmission device comprises brushless electric machine 20 and second gear reduction unit structure, described second gear reduction unit structure comprises the reduction gear 19 be installed on brushless electric machine 20 output shaft, the first gear 21 be meshed with reduction gear 19, the teeth-missing gear 13 that be arranged at second gear 18 transition gear axle 16 on and with second gear 18 be meshed same with the first gear 21, and described teeth-missing gear 13 fixed cover 11 closes on described live axle 15.
Be provided with Returnning spring 10 between described teeth-missing gear 13 and described valve body, the upper end of described Returnning spring 10 is fixed on described teeth-missing gear 13, and the lower end of described teeth-missing gear 13 is fixed on described live axle 15.
The periphery of described teeth-missing gear 13 side is provided with limiting stopper 13.1, and described valve body is provided with the first limit point 22 and the second limit point 23 for matching with described limiting stopper 13.1.
Described transition gear axle 16 is fixed on valve body, and on transition gear axle 16, fit is provided with copper sheathing 17.
On described live axle 15, fit is provided with bearing 8 and the axle sleeve 9 for positioning the axial position of teeth-missing gear 13, described body cavity is provided with the assembly department for matching with the outer ring of bearing 8, and the inner ring of described bearing 8 is sleeved on described live axle 15; Upper end and the described teeth-missing gear 13 of described axle sleeve 9 offset, and lower end and the described bearing 8 of described axle sleeve 9 offset.
Between described live axle 15 and upper valve body 14, fit is provided with orienting cover 6, be equipped with the first heat-insulating and sealing circle 4 between described orienting cover 6 and upper valve body 14, between described orienting cover 6 and live axle 15, interval is equipped with the second heat-insulating and sealing circle 5 and the 3rd heat-insulating and sealing circle 7.
Described live axle 15 is also provided with rotation angle for detecting spool 2 to determine the fixed cover 11 with the photoelectric coded disk be electrically connected with control gear of the aperture size of spool 2.
Specific works principle of the present utility model is:
When not receiving the pulse-width modulation control signal of electronic control unit (ECU), brushless electric machine 20 is in off-position, and under the effect of Returnning spring 10, the spool 2 of EGR valve is closed.
When EGR valve receives the pulse-width modulation control signal of ECU, brushless electric machine 20 drives the reduction gear 19 of double-reduction gear mechanism to rotate, through the first gear 21, second gear 18 by power transmission on teeth-missing gear 13.Because teeth-missing gear 13 is fixed on live axle 15, thus live axle 15 rotates along with the transhipment of teeth-missing gear 13.In like manner, the Returnning spring 10 be connected on upper valve body 14 and teeth-missing gear 13 can produce elastic potential energy along with the rotation of teeth-missing gear 13, owing to being installed on live axle 15 with the fixed cover 11 of photoelectric coded disk, thus fixed cover 11 also can rotate along with the rotation of live axle 15, thus effectively can detect the angle of swing of spool 2, because spool 2 is fixed on live axle 15 lower end, thus, the live axle 15 rotated can rotate around the axis of live axle 15 with movable valve plug 2, now, along with the rotation angle of spool 2 strengthens gradually, the second connection mouth on it is connected with the relief opening 1.2 of lower valve body 1 gradually, along with the increase of connecting area, exhaust gas flow is also increasing, when overlapping area reaches maximum, exhaust gas flow reaches maximum value, limiting stopper now on teeth-missing gear 13 can touch the first limit point 22 on upper valve body 14, ECU detects the output signal of photoelectric encoder at any time to judge the opening angle of spool 2, when spool 2 reaches maximum open position, damage is caused because of stall for preventing brushless electric machine 20, ECU no longer increases the dutycycle of pulse-width modulation control signal.
When EGR valve receives the shutdown signal of ECU, brushless electric machine 20 power-off, now, Returnning spring 10 drives teeth-missing gear 13 and spool 2 to rotate towards closing direction, the second connection mouth 2.3 on spool 2 also reduces gradually with the overlapping area of relief opening 1.2 on lower valve body 1, until the second limit point 23 on upper valve body 14 is encountered in the upper limit site of teeth-missing gear 13, the second connection mouth 2.3 now on spool 2 staggers completely with relief opening 1.2 on lower valve body 1, and spool 2 is in buttoned-up status.
Below only just most preferred embodiment of the present utility model is described, but can not be interpreted as it is limitations on claims.The utility model is not only confined to above embodiment, and its concrete structure allows to change.All various changes done in the protection domain of the utility model independent claims are all in the utility model protection domain.
Claims (10)
1. a diesel engine EGR valve, comprise control gear, valve body and the transmission device be located in valve body installation cavity, the lower end of described valve body is provided with suction port (1.1), and the side of described valve body is provided with relief opening (1.2), it is characterized in that: it is also comprised the live axle (15) that rotated in valve body by actuator drives and is fixed on live axle (15) lower end and spool (2) for controlling relief opening (1.2) aperture, described spool (2) is provided with the cylindrical sides matching with body cavity to make described relief opening (1.2) open or seal, and described spool (2) is provided with the waste gas drainage channel (2.1) in arcuation running through side perisporium from spool (2) lower end, the first connection mouth (2.2) for being connected with described suction port (1.1) is established in one end of described waste gas drainage channel (2.1), the other end of described waste gas drainage channel (2.1) establishes second connection mouth (2.3) that can be connected with described relief opening (1.2).
2. diesel engine EGR valve according to claim 1, it is characterized in that: described valve body is made up of split type upper valve body (14) and lower valve body (1), the upper end of described upper valve body (14) is provided with upper cover (12); And between described upper valve body (14) and lower valve body (1), be provided with sealing thermal insulating pad (3); Described spool (2) is placed in the cavity of described lower valve body (1) completely, and the lower end of described lower valve body (1) is located at by described suction port, described relief opening is located at the side of described lower valve body (1).
3. diesel engine EGR valve according to claim 2, is characterized in that: be interval with multiple lip ring between described lower valve body (1) and described spool (2).
4. diesel engine EGR valve according to claim 1, it is characterized in that: described transmission device comprises brushless electric machine (20) and second gear reduction unit structure, described second gear reduction unit structure comprises the reduction gear (19) be installed on brushless electric machine (20) output shaft, the first gear (21) be meshed with reduction gear (19), with the first gear (21) with the teeth-missing gear (13) being arranged at the second gear (18) on transition gear axle (16) and being meshed with the second gear (18), and described teeth-missing gear (13) fixed cover (11) closes on described live axle (15).
5. diesel engine EGR valve according to claim 4, it is characterized in that: between described teeth-missing gear (13) and described valve body, be provided with Returnning spring (10), the upper end of described Returnning spring (10) is fixed on described teeth-missing gear (13), and the lower end of described teeth-missing gear (13) is fixed on described live axle (15).
6. diesel engine EGR valve according to claim 4, it is characterized in that: the periphery of described teeth-missing gear (13) side is provided with limiting stopper (13.1), and described valve body is provided with the first limit point (22) for matching with described limiting stopper (13.1) and the second limit point (23).
7. diesel engine EGR valve according to claim 4, is characterized in that: described transition gear axle (16) is fixed on valve body, and the upper fit of transition gear axle (16) is provided with copper sheathing (17).
8. diesel engine EGR valve according to claim 4, it is characterized in that: the upper fit of described live axle (15) is provided with bearing (8) and the axle sleeve (9) for positioning the axial position of teeth-missing gear (13), described body cavity is provided with the assembly department for matching with the outer ring of bearing (8), and the inner ring of described bearing (8) is sleeved on described live axle (15); Upper end and the described teeth-missing gear (13) of described axle sleeve (9) offset, and lower end and the described bearing (8) of described axle sleeve (9) offset.
9. diesel engine EGR valve according to claim 2, it is characterized in that: between described live axle (15) and upper valve body (14), fit is provided with orienting cover (6), be equipped with the first heat-insulating and sealing circle (4) between described orienting cover (6) and upper valve body (14), between described orienting cover (6) and live axle (15), interval is equipped with the second heat-insulating and sealing circle (5) and the 3rd heat-insulating and sealing circle (7).
10. diesel engine EGR valve according to claim 4, is characterized in that: described live axle (15) is also provided with rotation angle for detecting spool (2) to determine the fixed cover with the photoelectric coded disk be electrically connected with control gear (11) of the aperture size of spool (2).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520940948.5U CN205154448U (en) | 2015-11-23 | 2015-11-23 | Diesel engine egr valve |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520940948.5U CN205154448U (en) | 2015-11-23 | 2015-11-23 | Diesel engine egr valve |
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| Publication Number | Publication Date |
|---|---|
| CN205154448U true CN205154448U (en) | 2016-04-13 |
Family
ID=55690153
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201520940948.5U Active CN205154448U (en) | 2015-11-23 | 2015-11-23 | Diesel engine egr valve |
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| CN (1) | CN205154448U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106762250A (en) * | 2015-11-23 | 2017-05-31 | 宁波思明汽车科技股份有限公司 | Diesel engine egr valve |
| CN111356831A (en) * | 2017-10-04 | 2020-06-30 | 法雷奥电机控制系统公司 | Actuator and fluid circulation valve comprising same |
-
2015
- 2015-11-23 CN CN201520940948.5U patent/CN205154448U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106762250A (en) * | 2015-11-23 | 2017-05-31 | 宁波思明汽车科技股份有限公司 | Diesel engine egr valve |
| CN111356831A (en) * | 2017-10-04 | 2020-06-30 | 法雷奥电机控制系统公司 | Actuator and fluid circulation valve comprising same |
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| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
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Address after: 688 Jucai Road, Wangchun Industrial Park, Haishu District, Ningbo City, Zhejiang Province Patentee after: NINGBO SIMING AUTOMOBILE TECHNOLOGY Co.,Ltd. Address before: 688 Jucai Road, Wangchun Industrial Park, Yinzhou District, Ningbo City, Zhejiang Province Patentee before: NINGBO SIMING AUTOMOBILE TECHNOLOGY Co.,Ltd. |