CN109707856A - Valve body connects system and gas recirculation system - Google Patents
Valve body connects system and gas recirculation system Download PDFInfo
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- CN109707856A CN109707856A CN201910107561.4A CN201910107561A CN109707856A CN 109707856 A CN109707856 A CN 109707856A CN 201910107561 A CN201910107561 A CN 201910107561A CN 109707856 A CN109707856 A CN 109707856A
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Abstract
The present invention relates to a kind of valve bodies to connect system, by the way that the length of the fastener is limited to setting length, and the top of fastener is embedded in the valve shaft, valve plate to be fixedly connected with valve shaft, so as under the premise of guaranteeing does not reduce effective screwing length of fastener, shorten the length of fastener to the maximum extent, to reduce the drag losses inside valve body air flue, increases effective use scope of the low pressure exhaust gas circulatory system.Meanwhile countersunk head design can make the through slot region of valve shaft by being easier to deform when clamping force, so that can be obtained effect same as tack fastener by applying lesser installation torque.
Description
Technical field
The present invention relates to the valve bodies on exhaust gas recirculation field more particularly to a kind of low pressure exhaust gas circulating valve to connect system
And gas recirculation system.
Background technique
Exhaust gas recycling be it is a kind of by gasoline or diesel engine work generate exhaust gas in a part be directed back to again into
Gas side and the technology for participating in burning again, the technology can delay the combustion process in engine cylinder, reduce burning, pressure release
Speed and pumping loss, while the ignition temperature in engine cylinder and oxygen concentration are also reduced, therefore inhibit combustion process
The generation of middle nitrogen oxides, and the fuel economy of automobile can be improved.According to taking gas and bleed in scheme for exhaust gas circulation system
The difference of position, scheme for exhaust gas circulation system are divided into the low pressure exhaust gas circulatory system and the high pressure exhaust gas circulatory system.Wherein phase higher pressure is useless
The gas circulatory system, the low pressure exhaust gas circulatory system have the efficient working range of waste gas circulation larger, the higher (Exhaust of EGR rate
The recycling of Gas Recycle exhaust gas), the advantages of combustion knock can be inhibited in low speed, high load capacity, so that having this
The vehicle of system possesses good fuel economy and the feature of environmental protection, can satisfy relevant laws and regulations emission request, obtains both at home and abroad
The favor of many host manufacturers.
Low pressure exhaust gas circulating valve is the key components and parts for being responsible for control gas inlet amount in the low pressure exhaust gas circulatory system, knot
Structure is mainly made of motor, transmission system, sensor and butterfly valve connection system etc., and the fastener (spiral shell in butterfly valve system
Nail) hinge that is connected as component, play the role of for both valve shaft and valve plate being fixedly connected.It is designed in traditional butterfly valve
In, in order to guarantee enough length of thread engagement to obtain better intensity and locking characteristic, screw is on being mounted on valve shaft
Afterwards, a part can be exposed from valve shaft, while screw head is tack form.For low pressure exhaust gas circulating valve, due to its gas
Road diameter is smaller, therefore since valve shaft, screw exposed portion bring shielded area can reduce effective circulation of exhaust gas.For reality
Now same EGR rate then needs the product of more big airways diameter, can increase the volume of product in turn in this way, occupies more
The space of engine to make the use of entire egr system by the limitation of engine design space, and also brings exhaust gas
The problems such as being re-introduced into difficulty.
Summary of the invention
The purpose of the present invention is to provide a kind of valve body connection system and gas recirculation systems, can guarantee not reduce
Under the premise of effective screwing length of fastener, shorten the length of fastener, to the maximum extent to solve low pressure exhaust gas circulating valve
Introducing exhaust gas that may be present is difficult, the problems such as limit by engine design space, the drag losses inside reduction valve body air flue.
In order to achieve the above object, the present invention provides a kind of valve bodies to connect system, including valve shaft, valve plate and several fastenings
Part is provided with the through slot through the valve shaft axle body on the valve shaft, and the valve plate is inserted into the through slot, several fastenings
Part passes through the valve plate from the side of the valve shaft with the fixation valve plate, and the length of the fastener is limited to setting length,
The valve plate to be fixedly connected with the valve shaft.
Optionally, the top of the fastener is embedded in the valve shaft.
Optionally, the fastener is countersunk fastener, and the countersunk fastener includes sunk screw.
Optionally, several location holes are provided on the valve shaft, the location hole extends radially through the valve shaft, Ruo Gansuo
Fastener is stated to penetrate in the valve shaft from several location holes respectively.
Optionally, each location hole is divided into the first branch and the second branch by the through slot, first branch compared with
Closer to the end of the fastener, the part that the fastener is contacted with first branch is threaded portion for second branch
Point.
Optionally, tapered portion is provided at the top of second branch, the top of the fastener compresses the tapered portion.
Optionally, the length that sets is according to the boundary condition and the valve shaft of the external screw thread failure by shear of the fastener
Internal screw thread failure by shear boundary condition obtain.
Optionally, the setting length L is obtained according to the following formulan:
Ln=L- (1/ λ) M
Wherein, λ is safety coefficient, and M is can shortening amount.
Optionally, obtain according to the following formula it is described can shortening amount M:
M=(L-L0-Q)-(N-H)；
If M=L-L is arranged in M < 00-Q；If M > 0, M=(L-L0-Q)-(N-H)；
Wherein, L is the initial length of the fastener, L0For the length of the fastener and the valve shaft clamping part, Q
For the imperfect externally threaded length in the fastener end, N is actually active screwing length, and H is minimum effective screwing length.
The present invention also provides a kind of gas recirculation systems, including an air flue and valve body as described above to connect system,
The valve body connection system is set in the air flue, and the output of exhaust gas is controlled by adjusting the position of valve plate.
The present invention is fixed the valve plate and the valve shaft by the way that the length of the fastener is limited to setting length
Connection, so as to shorten the length of fastener, to the maximum extent to reduce valve body under the premise of not reducing fastener performance
Drag losses inside air flue increase effective use scope of the low pressure exhaust gas circulatory system.Meanwhile this countersunk head design can make
Be easier to deform when the through slot region at valve shaft center is by clamping force, in this way can by apply smaller installation torque come
Obtain effect same as tack fastener.
Detailed description of the invention
Fig. 1 a is a kind of overall structure diagram of low pressure exhaust gas circulating valve；
Fig. 1 b is a kind of general frame schematic diagram of low pressure exhaust gas circulating valve；
The diagrammatic cross-section that Fig. 2 a is fastener when being cab-over design；
Fig. 2 b is diagrammatic cross-section when fastener designs for countersunk head；
Fig. 3 is the structural schematic diagram that valve body connects system in the embodiment of the present invention；
Fig. 4 is the diagrammatic cross-section in the embodiment of the present invention after fastener installation；
In figure: 101- motor；102- transmission system；103- sensor；104- butterfly valve connects system；3a- flat head screw；
3b- sunk screw；1- valve shaft；2- valve plate；3- fastener；4- through slot；5- location hole；51- tapered portion.
Specific embodiment
A specific embodiment of the invention is described in more detail below in conjunction with schematic diagram.According to following description,
Advantages and features of the invention will become apparent from.It should be noted that attached drawing is all made of very simplified form and using non-accurate
Ratio, only for the purpose of facilitating and clarifying the purpose of the embodiments of the invention.
Low pressure exhaust gas circulating valve is the key components and parts for being responsible for control gas inlet amount in the low pressure exhaust gas circulatory system, there is one
The structure of kind low pressure exhaust gas circulating valve is as shown in Fig. 1 a and Fig. 1 b, and structure is mainly by motor 101, transmission system 102, sensor
The composition such as 103 and butterfly valve connection system 104.Wherein butterfly valve connection system 104 is responsible for the direct of control exhaust gas flow size
Mechanical operating parts, butterfly valve connection system are made of valve shaft, valve plate and two fasteners.Butterfly valve connects system and air flue simultaneously
The exhaust gas circulation passage of low pressure exhaust gas circulating valve is constituted, effective actual internal area in the channel directly determines that low pressure exhaust gas recycles
Valve passes through the size of exhaust gas ability.And the hinge that the fastener in butterfly valve connection system is connected as component, it plays valve
The effect that both axis and valve plate are fixedly connected.One end of valve shaft is mounted on shell in an interference fit by bearing, valve
Plate passes through the through slot of the valve shaft, and valve plate and valve shaft are tightened fixation with certain torque by fastener；Return torque spring
It is pre- then to be welded with the valve shaft on fan tooth, for resetting the valve shaft.The torque that motor 101 exports passes through transmission
System 102 is transmitted in butterfly valve connection system 104, and the mesh of control exhaust gas output is reached by adjusting the physical location of valve plate
's.
In traditional butterfly valve design, inventors have found that more preferable to obtain in order to guarantee enough length of thread engagement
Intensity and locking characteristic, screw installation valve shaft 1 on after, the bottom of valve shaft 1 has the exposed portion of one section of screw；Spiral shell simultaneously
Nail head is tack form, and as shown in Figure 2 a, the head of flat head screw 3a protrudes from 1 surface of valve shaft.Low pressure exhaust gas is recycled
For valve, since its airway diameter is smaller, the exposed portion flat head screw 3a bring shielded area can be to effective circulation of exhaust gas
Amount is brought greater impact, in consideration of it, inventor is further discovered that the countersunk head design method according to screw, as shown in Figure 2 b,
The head of sunk screw 3b is embedded in valve shaft 1, can be maximum under the premise of guaranteeing not reduce sunk screw 3b effective screwing length
Shorten to limit the length of sunk screw 3b.
As shown in figure 3, present embodiments providing a kind of valve body connection system, including valve shaft 1, valve plate 2 and several fasteners
3, the through slot 4 through the valve shaft axle body is provided on the valve shaft 1, and the valve plate 2 is inserted into the through slot 4, several described
Fastener 3 passes through the valve plate 2 from the side of the valve shaft 1 with the fixation valve plate 2, and the length of the fastener 3 is limited to
Length is set, the valve plate 2 is fixedly connected with the valve shaft 1.
Specifically, the through slot 4 penetrates through the side wall of the valve shaft 1, the valve plate 2 is rounded, and the length of the through slot 4 is big
In the diameter of the valve plate 2, so that the valve plate 2 passes through the through slot 4.And in the present embodiment, the number of the fastener 3 is
2, it is embedded in the top section of the fastener 3 valve shaft 1, the limit length keeps the bottom of the fastener 3 slightly convex
For the valve shaft 1, so that the fastener 3 be made not to be exposed to the valve shaft 1 too much, shielded area, reduction pair are reduced
The influence of the effective circulation of exhaust gas.
Further, the fastener is countersunk fastener, and the countersunk fastener includes sunk screw.Specific implementation
When, the fastener can be the metal threaded fastener of any head type, the fastener including cab over type.
Further, refering to Fig. 4, several location holes 5 are provided on the valve shaft 1, the location hole extends radially through institute
Valve shaft is stated, several fasteners 3 penetrate in the valve shaft 1 from several location holes 5 respectively.It is described fixed in the present embodiment
Position hole 5 is 2, and the center of the location hole 5 is located along the same line.
Further, the through slot 4 divides each location hole 5 for the first branch and the second branch, and described first point
Closer to the end of the fastener 3, the part that the fastener 3 is contacted with first branch is second branch, portion
Threaded portion.Specifically, internal screw thread is arranged in the first branch of the location hole 5, so that the fastener 3 screws in the positioning
In hole 5, the external screw thread of the fastener 3 is matched with the internal screw thread of the location hole 5, to guarantee fastener 3 by the valve
Plate 2 is threadedly coupled with the valve shaft 1.
Further, tapered portion 51 is provided at the top of second branch, the top of the fastener 3 compresses the cone
Shape portion 51.When it is implemented, the fastener 3 screws in the location hole 5, and the top conical surface of the fastener 3 with it is described
The tapered portion 51 of second branch cooperates, and the top of the fastener 3 is made to compress the tapered portion 51.It can make so described
It is easier to deform when 4 region of through slot is by clamping force, can be obtained by the lesser installation torque of application same with tack fastener
The clamping effect of sample.
Further, several through-holes are provided on the valve plate 2, the diameter of the through-hole is greater than the straight of the fastener 3
Diameter, the fastener 3 pass through the valve plate 2 from the through-hole.In this way, the fastener 3 is enable swimmingly to pass through the valve
Plate 2, and the valve plate 2 is connect with the valve shaft 1.
In order to guarantee the pressing force of fastener 3, and shorten the length of fastener 3, inventor, which considers, to be guaranteed not reduce
Under the premise of the effective screwing length of fastener 3, shorten the length of fastener 3 to the maximum extent.
Specifically, the main perimeter strip with the external screw thread failure by shear of the fastener of the setting length of the fastener 3
The boundary condition of the internal screw thread failure by shear of part and the valve shaft is related.
In the present embodiment, by the initial length L of the fastener, minimum effectively screwing length H, actually active screwing length
N, the length L of clamping part0And obtain can shortening amount M by imperfect externally threaded length Q；According to it is described can shortening amount M shorten institute
The length for stating the threaded portion of fastener obtains the setting length of the fastener 3.
Firstly, obtaining the first screwing length for meeting the boundary condition of external screw thread failure by shear of the fastener respectively
Hi, obtain the second screwing length H for meeting the boundary condition of internal screw thread failure by shear of the valve shaft 1e。
The minimum effectively screwing length H can occur failure by shear boundary condition according to screw thread and calculate, if H < HeOr Hi, then
Failure by shear occurs for screw thread, therefore H chooses the first screwing length HiWith the second screwing length HeIn the larger value.
The first screwing length H is obtained according to the boundary condition of the external screw thread failure by shear of the fasteneri, specifically press
It is calculated according to following formula:
The second screwing length H is obtained according to the boundary condition of the internal screw thread failure by shear of the valve shaft 1e, specifically press
It is calculated according to following formula:
Wherein, AsFor dangerouse cross-section area, calculate according to the following formula:
In formula, P is the screw pitch of the fastener, and α is the half of thread angle or tooth form side angle of screw thread, and d is the outer spiral shell of fastener
The size of line outer diameter, d2For the size of the pitch diameter of external thread of fastener, d3For the size of the external screw thread bottom diameter of fastener, D1For valve
The size of the internal screw thread bottom diameter of axis 1, ρ are angle of friction, and angle of friction ρ is related with friction coefficient μ, are calculated according to the following formula:
μ=tan ρ；
σBBFor the tensile strength of fastener, τBBFor the external screw thread shear strength of fastener, τBNInternal screw thread for valve shaft 1 is cut
Shearing stress.Intensive parameter need to using the intensive parameter of standard fasteners (screw) finished product estimated, specifically can according to material with
And heat treatment, processing technology are obtained by strength test, such as carry out hardness examination by the approximate specification screw to same material
Vickers hardness is tested and obtained, tensile strength is then translated into, to obtain intensive parameter.
Further, the actually active screwing length N is obtained using following formula:
N=V-t；
Wherein, V is the practical screwing length of the fastener measured directly, and t is the imperfect internal screw thread of the valve shaft
Length (being not shown in Fig. 4).The imperfect internal screw thread length t of the valve shaft can be according to spiral shell in processing when manufacturing the valve shaft
The processing technology and chamfering value of line are specifically estimated.
Further, the difference U between the actually active screwing length N and minimum effectively screwing length H is calculated, it may be assumed that
U=N-H；
If U < 0 obtained after calculating, proves that initial designs are unqualified, does not consider.
In turn, the threshold limit value I that can actually shorten is calculated according to the following formula:
I=L-L0-Q；
Wherein, L is the initial length of the fastener, L0For the length of the fastener and the clamping part of the valve shaft 1
Degree, Q are the imperfect externally threaded length in the fastener end.
Can shortening amount M be the threshold limit value I and the difference U difference, it may be assumed that
M=I-U；
I.e. using following formula obtain it is described can shortening amount M:
M=(L-L0-Q)-(N-H)；
If M < 0, M=I, i.e. M=L-L are set0-Q；If M > 0, M=I-U, i.e. M=(L-L0-Q)-(N-H)。
Further, the setting length L of the fastener 3nIt calculates according to the following formula:
Ln=L- (1/ λ) M；
In the present embodiment, while in view of calculating error, environment and manufacture factor, the safety coefficient λ of design is set
It is 1~1.5, can be confirmed according to the gap with actual conditions theoretical in previous design experiences, and the size in calculation formula
Minimum and maximum limit of size need to be determined according to universal design criterion.As described above, then the setting length range of fastener 3
It answers are as follows:
Ln_min=L- (1/ λmin) M to Ln_max=L- (1/ λmax)M；
Wherein, λminFor minimum safety factor, λmaxFor maximum safety coefficient.
Further, the present invention also provides a kind of gas recirculation systems, including an air flue and valve body as described above
Connection system, the valve body connection system are set in the air flue, and the disengaging of exhaust gas is controlled by adjusting the position of valve plate
Amount.
To sum up, in valve body connection system provided in an embodiment of the present invention, by the way that the top of the fastener is embedded in institute
Valve shaft is stated, and is fixedly connected with the fastener with the valve shaft to set length for the valve plate, so as to not reduce
Under the premise of fastener performance, shorten the length of fastener to the maximum extent, to reduce the drag losses inside valve body air flue, increases
Add effective use scope of the low pressure exhaust gas circulatory system.Meanwhile the design of this countersunk head can make the through slot region at valve shaft center by
It is easier to deform when to clamping force, it in this way can be same as tack fastener to obtain by applying smaller installation torque
Effect.
The above is only a preferred embodiment of the present invention, does not play the role of any restrictions to the present invention.Belonging to any
Those skilled in the art, in the range of not departing from technical solution of the present invention, to the invention discloses technical solution and
Technology contents make the variation such as any type of equivalent replacement or modification, belong to the content without departing from technical solution of the present invention, still
Within belonging to the scope of protection of the present invention.
Claims (10)
1. a kind of valve body connects system, which is characterized in that including valve shaft, valve plate and several fasteners, be provided on the valve shaft
Through the through slot of the valve shaft axle body, the valve plate is inserted into the through slot, and several fasteners are from the side of the valve shaft
Across the valve plate with the fixation valve plate, the length of the fastener be limited to setting length, by the valve plate with it is described
Valve shaft is fixedly connected.
2. valve body as described in claim 1 connects system, which is characterized in that the top of the fastener is embedded in the valve shaft.
3. valve body as claimed in claim 1 or 2 connects system, which is characterized in that the fastener is countersunk fastener, described
Countersunk fastener includes sunk screw.
4. valve body as described in claim 1 connects system, which is characterized in that be provided with several location holes, institute on the valve shaft
It states location hole and extends radially through the valve shaft, several fasteners penetrate in the valve shaft from several location holes respectively.
5. valve body as claimed in claim 4 connects system, which is characterized in that each location hole is divided into the by the through slot
One branch and the second branch, second branch, the first branch is closer to the end of the fastener, the fastener
The part contacted with first branch is threaded portion.
6. valve body as claimed in claim 5 connects system, which is characterized in that be provided with taper at the top of second branch
The top in portion, the fastener compresses the tapered portion.
7. valve body as described in claim 1 connects system, which is characterized in that the setting length is according to the outer of the fastener
The boundary condition of the internal screw thread failure by shear of the boundary condition of screw thread failure by shear and the valve shaft obtains.
8. valve body as claimed in claim 1 or 7 connects system, which is characterized in that obtain the setting length according to the following formula
Spend Ln:
Ln=L- (1/ λ) M
Wherein, λ is safety coefficient, and M is can shortening amount.
9. valve body as claimed in claim 8 connects system, which is characterized in that obtain according to the following formula it is described can shortening amount M:
M=(L-L0-Q)-(N-H)；
If M=L-L is arranged in M < 00-Q；If M > 0, M=(L-L0-Q)-(N-H)；
Wherein, L is the initial length of the fastener, L0For the length of the fastener and the valve shaft clamping part, Q is institute
The imperfect externally threaded length in fastener end is stated, N is actually active screwing length, and H is minimum effective screwing length.
10. a kind of gas recirculation system, which is characterized in that including an air flue and as claimed in any one of claims 1-9 wherein
Valve body connects system, and the valve body connection system is set in the air flue, by adjusting the position of valve plate to control exhaust gas
Output.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910107561.4A CN109707856B (en) | 2019-02-02 | 2019-02-02 | Valve body connecting system and exhaust gas recirculation system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910107561.4A CN109707856B (en) | 2019-02-02 | 2019-02-02 | Valve body connecting system and exhaust gas recirculation system |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN109707856A true CN109707856A (en) | 2019-05-03 |
| CN109707856B CN109707856B (en) | 2021-07-16 |
Family
ID=66264299
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201910107561.4A Active CN109707856B (en) | 2019-02-02 | 2019-02-02 | Valve body connecting system and exhaust gas recirculation system |
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| CN1508419A (en) * | 2002-11-20 | 2004-06-30 | 株式会社电装 | Exhaust-recirculation controlling device |
| CN203515820U (en) * | 2013-08-12 | 2014-04-02 | 四川红光汽车机电有限公司 | Electronic injection throttle body |
| JP2015059463A (en) * | 2013-09-18 | 2015-03-30 | 株式会社デンソー | Fluid control valve |
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| CN205714447U (en) * | 2016-04-26 | 2016-11-23 | 上汽通用汽车有限公司 | Throttle valve device |
| CN206386190U (en) * | 2016-12-21 | 2017-08-08 | 宝沃汽车（中国）有限公司 | Air-throttle assemble, engine and vehicle |
| CN208294658U (en) * | 2018-05-29 | 2018-12-28 | 瑞安市阳宇机动车零部件有限公司 | reliable throttle body |
| EP3594471A1 (en) * | 2017-03-10 | 2020-01-15 | Honda Motor Co., Ltd. | Air intake structure for internal combustion engine |
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2019
- 2019-02-02 CN CN201910107561.4A patent/CN109707856B/en active Active
Patent Citations (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS63235629A (en) * | 1987-03-20 | 1988-09-30 | Nippon Carbureter Co Ltd | Engine intake throttle valve |
| CN1508419A (en) * | 2002-11-20 | 2004-06-30 | 株式会社电装 | Exhaust-recirculation controlling device |
| CN203515820U (en) * | 2013-08-12 | 2014-04-02 | 四川红光汽车机电有限公司 | Electronic injection throttle body |
| JP2015059463A (en) * | 2013-09-18 | 2015-03-30 | 株式会社デンソー | Fluid control valve |
| CN204344291U (en) * | 2014-12-19 | 2015-05-20 | 宁波高发汽车控制系统股份有限公司 | A kind of closure being applicable to electronic control air throttle |
| CN205714447U (en) * | 2016-04-26 | 2016-11-23 | 上汽通用汽车有限公司 | Throttle valve device |
| CN206386190U (en) * | 2016-12-21 | 2017-08-08 | 宝沃汽车（中国）有限公司 | Air-throttle assemble, engine and vehicle |
| EP3594471A1 (en) * | 2017-03-10 | 2020-01-15 | Honda Motor Co., Ltd. | Air intake structure for internal combustion engine |
| CN208294658U (en) * | 2018-05-29 | 2018-12-28 | 瑞安市阳宇机动车零部件有限公司 | reliable throttle body |
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| CN109707856B (en) | 2021-07-16 |
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