CN107378403B - The manufacturing method of engine exhaust gas reflux valve - Google Patents
The manufacturing method of engine exhaust gas reflux valve Download PDFInfo
- Publication number
- CN107378403B CN107378403B CN201710648405.XA CN201710648405A CN107378403B CN 107378403 B CN107378403 B CN 107378403B CN 201710648405 A CN201710648405 A CN 201710648405A CN 107378403 B CN107378403 B CN 107378403B
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- mentioned
- spool
- exhaust gas
- engine
- bead
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Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23P—METAL-WORKING NOT OTHERWISE PROVIDED FOR; COMBINED OPERATIONS; UNIVERSAL MACHINE TOOLS
- B23P15/00—Making specific metal objects by operations not covered by a single other subclass or a group in this subclass
- B23P15/001—Making specific metal objects by operations not covered by a single other subclass or a group in this subclass valves or valve housings
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B24—GRINDING; POLISHING
- B24C—ABRASIVE OR RELATED BLASTING WITH PARTICULATE MATERIAL
- B24C1/00—Methods for use of abrasive blasting for producing particular effects; Use of auxiliary equipment in connection with such methods
- B24C1/10—Methods for use of abrasive blasting for producing particular effects; Use of auxiliary equipment in connection with such methods for compacting surfaces, e.g. shot-peening
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16K—VALVES; TAPS; COCKS; ACTUATING-FLOATS; DEVICES FOR VENTING OR AERATING
- F16K1/00—Lift valves or globe valves, i.e. cut-off apparatus with closure members having at least a component of their opening and closing motion perpendicular to the closing faces
- F16K1/32—Details
- F16K1/48—Attaching valve members to screw-spindles
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Lift Valve (AREA)
- Exhaust-Gas Circulating Devices (AREA)
- Heat Treatment Of Articles (AREA)
- Sliding Valves (AREA)
Abstract
The present invention relates to a kind of manufacturing methods of engine exhaust gas reflux valve.The engine is used in engine with exhaust gas reflux valve, it is that metal spool is fixed on made of the top end part of metal valve shaft using welding, above-mentioned spool has axis hole at its center, it is substantially in truncated cone shape and has bottom surface, the above-mentioned axis hole of above-mentioned spool is nested in the top end part of above-mentioned valve shaft, later, axial end and surrounding above-mentioned bottom surface to above-mentioned valve shaft implement welding, later, bead is nearby implemented to the interface for implementing the above-mentioned weld part being welded and the weld part, to apply the part of imaginary depth of the compression stress until being deeper than the pitting generated by corrosion.
Description
It is May 29, entitled spool in 2015 that the application, which is application No. is the 201510288987.6, applying date,
The divisional application of the application of fixing means between valve shaft.
Technical field
The present invention relates to a kind of manufacturing methods of engine exhaust gas reflux valve, such as are related to the control valves for fluids such as EGR valve
Metal spool is fixed on the top end part of metal valve shaft by used spool and valve shaft.
Background technique
In the past, as this kind of technology, such as there is known the systems of the EGR valve of the construction of poppet described in following patent documents 1
Make method.The EGR valve includes: valve seat, is located in the flow path of shell；Metal spool, valve seat can be seated at
Mode is arranged；Metal valve shaft is used to that spool to be made to move back and forth relative to valve seat；And driver, it is used to drive valve shaft.
Here, being respectively formed spool and valve shaft, later, spool is assembled in the lower end of valve shaft by clearance fit, line position of going forward side by side is set
They are fixed up by welding etc. by adjustment later.
Existing technical literature
Patent document
Patent document 1:WO01/061225
Summary of the invention
Problems to be solved by the invention
However, in the manufacturing method described in patent document 1, after the lower end that spool is welded on to valve shaft, welding
When portion turns cold and solidifies, tensile stress can be generated in weld part and the tensile stress can remain in weld part.Therefore, if corroding
When using EGR valve under environment, the part for remaining tensile stress may result in spool and generate stress corrosion cracking (SCC).Especially exist
In the engine for having used inferior fuel, the acid degree that gas is discharged is stronger, and the moisture as contained by EGR gas can generate acidity
Stronger condensed water, because a possibility that weld part is made nearby to generate stress corrosion cracking (SCC) for the condensed water becomes larger.
The present invention is to be made into view of the foregoing, it is intended that providing one kind can prevent in spool and valve
Weld part between axis nearby generates the fixing means between the spool and valve shaft of stress corrosion cracking (SCC).
The solution to the problem
In order to achieve the above object, invention described in technical solution 1 is the fixing means between a kind of spool and valve shaft,
In the fixing means, metal spool is fixed on to the top end part of metal valve shaft, purport is, spool is in its center
Place has axis hole, is substantially in truncated cone shape and has bottom surface, the axis hole of spool is nested in the top end part of valve shaft, it
Afterwards, welding is implemented to the axial end of valve shaft and surrounding bottom surface, later, is attached to the upper end of substantially tubular fixture
The peripheral part of the bottom surface of spool, in the inside of fixture, near the interface of the weld part and the weld part implementing to be welded
Implement bead, to apply the part of depth of the compression stress until being deeper than the pitting generated by corrosion.
It will be pressed from both sides after the axial end and the implementation welding of surrounding bottom surface to valve shaft using the structure of foregoing invention
The upper end of tool is attached to the peripheral part of the bottom surface of spool, in the inside of fixture, near the interface of weld part and the weld part
Implement bead, to apply the part of depth of the compression stress until being deeper than the pitting generated by corrosion.Thus, it is possible to pass through
Bead is applied around compression stress to the interface of the weld part and the weld part that remain tensile stress after welding, therefore,
The part for stretching residual stress until being deeper than the hypothetical depth of pitting can be mitigated.Moreover, implementing the range quilt of bead
It is limited in the range of the bottom surface of spool, inside included in fixture.
In order to achieve the above object, the purport of invention according to technical solution 1, invention described in technical solution 2 exists
In, in advance the bottom surface of spool peripheral part formed be lower than central part stage portion, the upper end of fixture is being attached to bottom
When the peripheral part in face, the upper end of fixture is made to be embedded in stage portion.
It is other than the effect of the invention described in the technical solution 1, the upper end of fixture is embedding using the structure of foregoing invention
Enter the stage portion of spool, therefore, the leakproofness of the medium between spool and fixture relative to bead can be made preferable.
In order to achieve the above object, the invention according to technical solution 1 or 2, the purport of invention described in technical solution 3
It is, corner formed by the stage portion and bottom surface of spool is formed as arc-shaped.
Using the structure of foregoing invention, other than the effect of the invention described in the technical solution 1 or 2, the corner of stage portion
In arc-shaped, angle (Japanese: ダ レ) is collapsed brought by the influence because of bead thus it is not easy to generate in the corner.
In order to achieve the above object, the invention according to any one of technical solution 1~3, hair described in technical solution 4
Bright purport is that the partial size of medium used in bead is 0.5 or less φ.
Using the structure of foregoing invention, other than the effect of the invention described in any one of technical solution 1~3, such as
The spool for being fixed on valve shaft is assembled in control valve for fluids and in the case where use, even if medium is bitten in spool and valve
Between seat, fluid leakage is also reduced.
The effect of invention
Using invention described in technical solution 1, can prevent from generating stress near the weld part between spool and valve shaft
Corrosion cracking.Moreover, can easily apply the range of compression stress by bead in the bottom surface setting of spool.
Using invention described in technical solution 2, other than the The effect of invention described in the technical solution 1, medium is not easy
It enters between spool and fixture, so as to improve the processing effect for carrying out bead to the bottom surface of spool.
Using invention described in technical solution 3, other than the The effect of invention described in the technical solution 1 or 2, it is not easy to
Therefore the corner of stage portion, which generates angle of collapsing, can be not easy to be clipped in medium between corner and fixture, so as to successfully grasp
Make fixture.
Using invention described in technical solution 4, other than the The effect of invention described in any one of technical solution 1~3,
Such as in the case where the spool after fixing and valve shaft to be used in EGR valve, in engine retard operating, it can reduce and locate
EGR gas leaks caused by biting medium in fully closed EGR valve, so as to inhibit to cause to send out because sucking EGR gas
Motivation is caught fire.
Detailed description of the invention
Fig. 1 is related to an embodiment, is the main sectional view for indicating the EGR valve of full-shut position.
Fig. 2 is related to an embodiment, and the process (before welding) being related in fixing means, be amplification indicate Fig. 1 by
The cross-sectional view for the part that chain-dotted line quadrangle surrounds.
Fig. 3 is related to an embodiment, and the process (after welding) being related in fixing means, be amplification indicate Fig. 1 by
The cross-sectional view for the part that chain-dotted line quadrangle surrounds.
Fig. 4 is related to an embodiment, and the process (bead) being related in fixing means, is that amplification indicates Fig. 1
By the cross-sectional view for the part that chain-dotted line quadrangle surrounds.
Fig. 5 is related to an embodiment, is the cross-sectional view of a part that amplification indicates spool and valve shaft after welding.
Fig. 6 is related to an embodiment, is the cross-sectional view that the surface for indicating spool is further amplified.
Fig. 7 is related to an embodiment, is the cross-sectional view of a part that amplification indicates in Fig. 4.
Fig. 8 is related to an embodiment, is to compare to indicate before implementing bead and after implementing bead after welding
Residual stress (tensile stress) chart.
Fig. 9 is related to an embodiment, is to compare expression in the case where bead is not carried out and implement bead
In the case where spool bottom surface the depth away from surface and residual stress (tensile stress, compression stress) between relationship figure
Table.
Figure 10 is related to an embodiment, is the cross-sectional view of the part for the stage portion that amplification indicates spool.
Specific embodiment
The fixing means between spool and valve shaft of the invention is embodied in exhaust hereinafter, being described in detail with reference to accompanying drawings
An embodiment in return valve (EGR valve).
EGR valve 1 when Fig. 1 indicates fully closed using main sectional view.EGR valve 1 is set to EGR passage, which is used for will be certainly
The a part for the discharge gas that engine ejects is back to intake channel as EGR gas, and EGR valve 1 is for adjusting EGR gas
Flow.
As shown in Figure 1, EGR valve 1 is poppet construction comprising: metal shell 3, including the stream of EGR gas
Road 2；Metal valve seat 4 is set to the midway of flow path 2；Metal spool 5, is set in a manner of it can be seated at valve seat 4
It sets, is formed with the measurement unit of EGR gas between valve seat 4 at it；Metal valve shaft 6 is used to make spool 5 relative to valve seat
4 move back and forth；And driver 7, it is used to drive valve shaft 6 and spool 5.Driver 7 is made of stepper motor as an example, energy
Enough make valve shaft 6 and spool 5 back and forth movement (stroke motion) in the axial direction together.The EGR valve 1 is configured to, by utilizing driver 7
Make spool 5 relative to the movement of valve seat 4 to change the opening area of measurement unit, to adjust the EGR gas flow in flow path 2.?
In present embodiment, the detailed description of the structure of driver 7 is omitted.The both ends of flow path 2 are to import the entrance 2a of EGR gas and lead
The outlet 2b of EGR gas out.
In the present embodiment, the mode that valve shaft 6 runs through to vertical shell 3 in Fig. 1 configures, base end part (upper end)
Link by thread mechanism with driver 7 and is driven by driver 7.Valve seat 4 is substantially annular in shape, has valve opening at its center
4a.Spool 5 is at its center with axis hole 5a, generally conical shape and with bottom surface 5b.Spool 5 is fixed on valve shaft 6
Top end part (lower end).The 1st thrust bearing 8 and the 2nd thrust bearing configured in series is equipped between shell 3 and valve shaft 6
9, the 1st thrust bearing 8 and the 2nd thrust bearing 9 are used to support valve shaft 6 in a manner of valve shaft 6 can be made to carry out stroke motion.Respectively
Thrust bearing 8,9 is substantially cylindrical in shape, they are embedded in the assembly hole 3a for being formed in the center of shell 3 to be fixed against.With
In by lippacking 10 sealed between shell 3 and valve shaft 6, substantially cylindrical with adjacent with the 2nd thrust bearing 9
Mode be set to shell 3.For avoided between guard shield 3 and valve shaft 6 deposit deposition protect plug 11 with lip shape
The adjacent mode of sealing element 10 is set to shell 3.
The axis hole 5a of spool 5 is nested in the top end part (lower end) of valve shaft 6, and to the axial end and its surrounding of valve shaft 6
Bottom surface 5b implement welding.Then, by bead to the interface of weld part 21 and the weld part 21 after implementing welding
It is applied around the part of depth of the compression stress until being deeper than the pitting generated by corrosion.In the periphery of the bottom surface 5b of spool 5
Portion is formed with the stage portion 5c lower than other parts.It is set at by the part that bead is applied compression stress and compares step
Portion 5c in the inner part in the range of.In the present embodiment, it is that material is formed that spool 5, which is with " SUS316L ",.Select the material
Reason be because in view of proper alignment and anticorrosion stress-resistant it is anti-thread breakage (such as low-carbon and increase nickel content.).
Then, the fixing means between spool 5 and valve shaft 6 is illustrated.In the present embodiment, spool 5 is in valve shaft 6
It has been assembled in the top end part (lower end) for being fixed on valve shaft 6 in the state of shell 3 in accordance with the following steps.Fig. 2~Fig. 4 is utilized and is cutd open
View and in fixing means process passage amplification indicate Fig. 1 by chain-dotted line quadrangle S1 surround part.
That is, as shown in Fig. 2, initially first pass through clearance fit by the axis hole 5a of spool 5 be nested in valve shaft 6 top end part (under
End).
Later, as shown in figure 3, axial end 6a and surrounding bottom surface 5b to valve shaft 6 implement welding.By being somebody's turn to do
Welding, the weld part 21 being only welded to implementation are locally heated, and therefore, the thermal expansion of the weld part 21 can be soldered portion 21
Part in addition prevents, to generate thermal stress on the surface layer of the bottom surface 5b of spool 5, and then can generate because of the thermal stress residual
Residue stress.Here, the surface layer of the bottom surface 5b of spool 5 generates the plastic deformation of compressibility during heating.Later, when cold
When but, which can only be such that weld part 21 shrinks, still, since weld part 21 and the surface layer of bottom surface 5b are tightly attached to
Together, therefore, the surface layer of bottom surface 5b can be stretched.As a result, can near weld part 21 residual tensile stress.That is, when weldering
When socket part 21 is heated to a certain temperature, is cooled later, compression stress and plastic deformation can be generated during heating, cold
But it can be changed into tensile stress during, finally, tensile stress can remain in the surface layer of the bottom surface 5b of spool 5.
Later, as shown in figure 4, the upper end of substantially tubular fixture 26 to be attached to the periphery of the bottom surface 5b of spool 5
Portion.In the present embodiment, the upper end of fixture 26 is made to be embedded in the stage portion for being formed on the peripheral part of bottom surface 5b of spool 5
5c.Then, in the inside of fixture 26, bead nearby is implemented to the interface of weld part 21 and the weld part 21, to apply pressure
The part of depth of the stress under compression until being deeper than the pitting generated by corrosion.That is, as shown in figure 4, fine from 28 high-pressure injection of nozzle
Granular medium 27 simultaneously makes the medium 27 collide the portion of being processed at a high speed.
Fig. 5 indicates a part of spool 5 and valve shaft 6 after welding using cross-sectional view amplification.As used double dot dash line institute in Fig. 5
Show, pitting 41 may be generated because of corrosion in the bottom surface 5b of spool 5.Fig. 6 is further amplified using cross-sectional view indicates spool 5
Surface.In detail, it when the surface of spool 5 disappears due tos being corroded etc., can generate enclosed by the dotted line such in Fig. 6
Pitting 41.The pitting 41 indicates the exposure for remaining the part of tensile stress.It later, may be from the hole when using spool 5
41 generation stress corrosion cracking (SCC)s 42 are lost, then spool 5 can be made to chap from stress corrosion cracking (SCC).Therefore, in this implementation
In mode, for the sake of security, apply the part of imaginary depth of the compression stress until being deeper than the pitting 41 by bead.
In the present embodiment, the imaginary depth of pitting 41 is set as " 180 (μm) ", by the depth shown in fig. 6 for applying compression stress
Degree d1 is set as " about 200 (μm) or more.Moreover, in the present embodiment, as the condition of bead, used by
The medium 27 that SUS304 is constituted.The partial size of medium 27 is set as " φ 0.5 (500 μm) is below ".In more detail, it is set as " φ
0.3(300μm)".As the condition of bead, pressure is set as " 0.4 (Mpa) ", " 10 seconds " will be set as the time.
Fig. 7 indicates a part in Fig. 4 using cross-sectional view amplification.As shown in fig. 7, in the present embodiment, the platform of spool 5
Corner 5d formed by rank portion 5 and bottom surface 5b is formed as arc-shaped.Moreover, the inner peripheral surface 26a and step of the upper end of fixture 26
A little gap g1 is equipped between the outer peripheral surface 5ca of portion 5c.
Using the fixing means between the spool and valve shaft of present embodiment described above, in the axial end to valve shaft 6
After 6a and surrounding bottom surface 5b implements welding, the upper end of substantially tubular fixture 26 is attached to the bottom of spool 5
The peripheral part of face 5b nearby implements bead to the interface of weld part 21 and the weld part 21 in the inside of the fixture 26, with
Apply the part of imaginary depth of the compression stress until being deeper than the pitting 41 generated by corrosion.Thus, pass through bead butt welding
The interface of the weld part 21 and the weld part 21 that remain tensile stress after connecing is applied around compression stress, therefore, mitigates and stretches
Part of the residual stress until being deeper than the hypothetical depth of pitting 41.Therefore, even if the surface layer of the bottom surface 5b of spool 5 is because of corrosion
And pitting 41 is generated, but stretch the part of depth of the residual stress until being deeper than pitting 41 due to mitigating, source can be prevented
From the stress corrosion cracking (SCC) of pitting 41.Moreover, implement bead range be limited in spool 5 bottom surface 5b, include
In the range of the inside of fixture 26.Therefore, it can easily be applied in the bottom surface 5b setting of spool 5 by bead and be pressed
The range of stress under compression.
Fig. 8 is compared using chart to be indicated (to spray before implementing bead (before bead) and after implementing bead
Ball processing after) welding after residual stress (tensile stress).The chart means to reduce residual stress by bead
Goal-setting.In the present embodiment, as shown in figure 8, target is, the residual stress of " 300 (MPa) " before making bead
(tensile stress) becomes the residual stress of " 100 (MPa) are below " after bead.
Here, being identified through the effect of the reduction residual stress of bead generation.Fig. 9 compares expression not using chart
In the case where implementing bead (no bead) and implement spool 5 in the case where bead (implement bead after)
Bottom surface 5b the depth away from surface and residual stress (tensile stress, compression stress) between relationship.The graph representation is residual
Measurement result at the highest position of residue stress (near the periphery interface of weld part 21).As shown in figure 9, being not carried out at shot-peening
In the case where reason, residual stress cannot achieve " 100 as target value in the depth bounds of " 0 (μm)~800 (μm) "
(MPa) below ".In contrast, as shown in figure 9, it is found that residual stress is in " 0 (μm)~about 460 after implementing bead
" 100 (MPa) are below " as target value is realized in the depth bounds of (μm) ".Moreover, it is found that as target value
The depth of " 200 (μm) ", in the case where bead is not carried out, be " about 180 (MPa) " residual stress (stretching is answered
Power), in contrast, being the residual stress (compression stress) of " about -200 (MPa) " after implementing bead.In this way, passing through
Implement bead, the remnants that the residual stress (tensile stress) of " about 180 (MPa) " is down to " about -200 (MPa) " can be answered
Power (compression stress).
In the present embodiment, by the stage portion 5c of the upper end of fixture 26 insertion spool 5, therefore, can make spool 5 with
Leakproofness between fixture 26 relative to the medium of bead 27 is preferable.Therefore, medium 27 is not easily accessed spool 5 and folder
Between tool 26, so as to improve the processing effect for carrying out bead to the bottom surface 5b of spool 5.
In the present embodiment, the corner 5d of the stage portion 5c of spool 5 is formed as arc-shaped, thus it is not easy at the angle
Portion 5d generates angle of collapsing brought by the influence because of bead.Figure 10 amplifies the stage portion 5c's for indicating spool 5 using cross-sectional view
Part.Assuming that the corner of stage portion 5c is not arc-shaped and is formed as angular shape, can be generated in the corner by bead
The angle 43 of collapsing of eaves shape as being indicated in Figure 10 with double dot dash line, thereby increases and it is possible to can collapse at this and accompany Jie between angle 43 and fixture 26
Matter 27.In the present embodiment, since the corner 5d generation for being not easy in stage portion 5c is collapsed angle 43, thus it is not easy to make medium
27 are clipped between corner 5d and fixture 26, so as to successfully operate fixture 26.
In the present embodiment, make the spool 5 for being fixed on valve shaft 6 is assembled in the EGR valve 1 as control valve for fluids
In the case where, the medium 27 even remained in flow path 2 is bitten between spool 5 and valve seat 4, but due to medium 27
Partial size is set to " φ 0.5 or less ", therefore can also reduce the leakage of EGR gas.As a result, for example being operated in engine retard
When, EGR gas caused by biting medium 27 in fully closed EGR valve 1 can be reduced and leaked, so as to inhibit because inhaling
Enter EGR gas and leads to engine fire.
In addition, the present invention is not limited to above embodiment, the range for the purport for not departing from invention also can be to knot
A part of structure is suitably changed and is implemented.
Such as in the above-described embodiment, the fixing means between spool 5 and valve shaft 6 used in EGR valve 1 is carried out
Illustrate, still, the spool and valve shaft fixed are not limited to can be used for the fluid control other than EGR valve for EGR valve
Valve.
Industrial availability
The present invention for example can be applied to the manufacture of the control valves for fluids such as EGR valve.
Description of symbols
1, EGR valve；5, spool；5a, axis hole；5b, bottom surface；5c, stage portion；5d, corner；6, valve shaft；6a, axial end；
21, weld part；26, fixture；26a, inner peripheral surface；27, medium.
Claims (6)
- It is benefit 1. a kind of manufacturing method of engine exhaust gas reflux valve, the engine are used in engine with exhaust gas reflux valve Metal spool is fixed on made of the top end part of metal valve shaft with welding, which is characterized in thatAbove-mentioned spool has axis hole at its center, be substantially in truncated cone shape and have bottom surface,The above-mentioned axis hole of above-mentioned spool is nested in the top end part of above-mentioned valve shaft,Later, the axial end to above-mentioned valve shaft and surrounding above-mentioned bottom surface implement welding,Later, bead nearby is implemented to the interface for implementing the above-mentioned weld part being welded and the weld part, to apply pressure The part of imaginary depth of the stress under compression until being deeper than the pitting generated by corrosion.
- 2. the manufacturing method of engine exhaust gas reflux valve according to claim 1, which is characterized in thatBy implementing above-mentioned bead, residual tensile stress is become into imagination of the residual compression stress until being deeper than above-mentioned pitting The part of depth.
- 3. the manufacturing method of engine exhaust gas reflux valve according to claim 2, which is characterized in thatBy implementing above-mentioned bead, above-mentioned residual tensile stress is become into above-mentioned residual compression stress until being deeper than above-mentioned hole The part of the imaginary depth of erosion prevents the stress corrosion cracking (SCC) from above-mentioned pitting as a result,.
- 4. the manufacturing method of engine exhaust gas reflux valve described in any one of claim 1 to 3, which is characterized in thatThe imaginary depth of above-mentioned pitting be 180 μm, by above-mentioned bead apply above-mentioned compression stress depth be 200 μm with On.
- 5. the manufacturing method of engine exhaust gas reflux valve described in any one of claim 1 to 3, which is characterized in thatThe above-mentioned pitting generated by corrosion is as caused by above-mentioned engine using fuel, what is be discharged from above-mentioned engine In the stronger situation of acid degree of exhaust, produced as the moisture contained by the exhaust gas recirculation gas flowed in above-mentioned exhaust gas reflux valve Raw acid stronger condensed water, as a result, near above-mentioned weld part, in the remaining portion of the tensile stress as caused by above-mentioned welding Divide and generates the above-mentioned pitting generated by corrosion.
- 6. the manufacturing method of engine exhaust gas reflux valve according to claim 4, which is characterized in thatThe above-mentioned pitting generated by corrosion is as caused by above-mentioned engine using fuel, what is be discharged from above-mentioned engine In the stronger situation of acid degree of exhaust, produced as the moisture contained by the exhaust gas recirculation gas flowed in above-mentioned exhaust gas reflux valve Raw acid stronger condensed water, as a result, near above-mentioned weld part, in the remaining portion of the tensile stress as caused by above-mentioned welding Divide and generates the above-mentioned pitting generated by corrosion.
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2014111187A JP6058586B2 (en) | 2014-05-29 | 2014-05-29 | Manufacturing method of exhaust gas recirculation valve for engine |
| JP2014-111187 | 2014-05-29 | ||
| CN201510288987.6A CN105290722B (en) | 2014-05-29 | 2015-05-29 | Fixing means between valve element and valve shaft |
Related Parent Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201510288987.6A Division CN105290722B (en) | 2014-05-29 | 2015-05-29 | Fixing means between valve element and valve shaft |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN107378403A CN107378403A (en) | 2017-11-24 |
| CN107378403B true CN107378403B (en) | 2019-04-02 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201510288987.6A Active CN105290722B (en) | 2014-05-29 | 2015-05-29 | Fixing means between valve element and valve shaft |
| CN201710648405.XA Active CN107378403B (en) | 2014-05-29 | 2015-05-29 | The manufacturing method of engine exhaust gas reflux valve |
Family Applications Before (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201510288987.6A Active CN105290722B (en) | 2014-05-29 | 2015-05-29 | Fixing means between valve element and valve shaft |
Country Status (2)
| Country | Link |
|---|---|
| JP (1) | JP6058586B2 (en) |
| CN (2) | CN105290722B (en) |
Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2017214967A (en) * | 2016-05-31 | 2017-12-07 | 愛三工業株式会社 | Valve device and welding method of valve shaft and valve body of valve device |
| JPWO2019008901A1 (en) * | 2017-07-07 | 2020-05-07 | 新東工業株式会社 | Shot peening method |
| US10344757B1 (en) * | 2018-01-19 | 2019-07-09 | Kennametal Inc. | Valve seats and valve assemblies for fluid end applications |
| JP7141423B2 (en) * | 2020-04-09 | 2022-09-22 | 株式会社鷺宮製作所 | Electric valve and refrigeration cycle system |
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Also Published As
| Publication number | Publication date |
|---|---|
| JP2015224754A (en) | 2015-12-14 |
| CN107378403A (en) | 2017-11-24 |
| CN105290722B (en) | 2017-09-15 |
| CN105290722A (en) | 2016-02-03 |
| JP6058586B2 (en) | 2017-01-11 |
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