CN209352956U - The quenching unit of rack bar - Google Patents
The quenching unit of rack bar Download PDFInfo
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- CN209352956U CN209352956U CN201821779067.XU CN201821779067U CN209352956U CN 209352956 U CN209352956 U CN 209352956U CN 201821779067 U CN201821779067 U CN 201821779067U CN 209352956 U CN209352956 U CN 209352956U
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- rack gear
- constraint
- rack
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D1/00—General methods or devices for heat treatment, e.g. annealing, hardening, quenching or tempering
- C21D1/62—Quenching devices
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D1/00—General methods or devices for heat treatment, e.g. annealing, hardening, quenching or tempering
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D1/00—General methods or devices for heat treatment, e.g. annealing, hardening, quenching or tempering
- C21D1/18—Hardening; Quenching with or without subsequent tempering
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D1/00—General methods or devices for heat treatment, e.g. annealing, hardening, quenching or tempering
- C21D1/56—General methods or devices for heat treatment, e.g. annealing, hardening, quenching or tempering characterised by the quenching agents
- C21D1/60—Aqueous agents
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D1/00—General methods or devices for heat treatment, e.g. annealing, hardening, quenching or tempering
- C21D1/62—Quenching devices
- C21D1/667—Quenching devices for spray quenching
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D9/00—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor
- C21D9/0068—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor for particular articles not mentioned below
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D9/00—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor
- C21D9/32—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor for gear wheels, worm wheels, or the like
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
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- Y02P10/20—Recycling
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Abstract
It is irregular and can provide the quenching unit of the rack bar of higher precision that the utility model provides a kind of tooth pitch caused by capable of preventing because of quenching distortion.It is formed in the partial sector in the length of hollow shaft member (11) in the quenching unit (100) of the rack bar (10) of rack gear (12), the partial sector for being formed with rack gear (12) is heated, it is constrained from multiple radial directions section is heated portion of in the whole length of partial sector, coolant liquid is uniformly ejected at least through each tooth root of rack gear (12) and multiple annular region A of the periphery of surrounding portion section from multiple the constraint tools (101)~(104) of constraint portions sectioni(i=1~n).
Description
Technical field
The quenching unit for the rack bar that the utility model relates to a kind of to use in the transfer etc. of automobile.
Background technique
Rack bar is the component that rack gear is formed in the partial sector in the length of shaft member, and it is also known that is had to subtract
Light weight and the rack bar made of hollow shaft member.When rack bar is quenched after processing, it is formed with the part area of rack gear
The cross sectional shape of section is asymmetric, and since residual stress when rack gear is processed is higher, is easy to happen and is drawn by quenching
The bending risen, the trend that the rack bar made of hollow shaft member bends are obvious.It is carried out about it is thus known that having to rack bar
Implement the quenching unit and process for quenching of quenching in the state of beam (for example, with reference to patent document 1 and patent document 2).
Quenching unit described in patent document 1 has for constraining from up and down direction and left and right directions rack bar
Four the constraint tools.The multiple protrusions contacted with rack bar are provided on each the constraint tool, and between these protrusions
Small pore-like coolant liquid jet port is formed in recess portion.Coolant liquid jet port is arranged along the length direction of rack bar.What is be heated
Rack bar by four the constraint tools from up and down direction and left and right directions it is restrained in the state of, from these coolant liquid jet ports
Spray cooling liquid, and rack bar is quenched.
Although quenching unit described in patent document 2 also have for from up and down direction and left and right directions to rack bar into
Four the constraint tools of row constraint, but on the constraint tool contacted with rack gear in four the constraint tools, it is cold instead of small pore-like
But liquid jet port and be formed with the coolant liquid spray tank extended in the whole length of rack gear.
Existing technical literature
Patent document
Patent document 1: Japanese Patent Laid-Open 2000-119739 bulletin
Patent document 2: Japanese Patent Laid-Open 2001-11536 bulletin
Utility model content
The technical issues of utility model is to be solved
In the quenching unit described in patent document 1, according to the difference of tooth there may be cooling velocity it is variant and
The irregular situation of the tooth pitch of rack gear.The smooth engagement that may irregularly hinder between rack-and-pinion of tooth pitch, and can
The performance for having used the mechanical device of rack bar can be caused to decline.In the quenching unit described in patent document 2, constrained at four
On the constraint tool contacted with rack gear in tool, the nozzle of spray cooling liquid is replaced by the whole length in rack gear by aperture
Therefore the slot of upper extension can be such that the cooling velocity of each tooth homogenizes, and inhibit the irregular conditions of tooth pitch.However,
With the raising of the performance for the mechanical device for having used rack bar, the precision of tooth is then required further to homogenize for rack bar,
And it needs to take additional measure.
The utility model is to complete in view of the foregoing, and its purpose is to provide one kind to be able to suppress because of quenching distortion
Caused tooth pitch is irregular, and can provide the quenching unit and process for quenching of the rack bar of higher precision.
For technical means to solve problem
The quenching unit of the rack bar of one aspect according to the present utility model is the portion in the length of hollow shaft member
The quenching unit of the rack bar of rack gear is formed in sectional, which is characterized in that, has multiple the constraint tools, institute
The constraint tool is stated to be configured in the whole length of the partial sector from multiple radial directions to the partial sector being heated
It is constrained, multiple described the constraint tools are respectively provided with ejection section, and the ejection section is configured to for coolant liquid being ejected into described
The position opposed with the constraint tool in partial sector, the ejection section are configured to for the coolant liquid being uniformly ejected at least
Multiple annular regions of the periphery of the partial sector are surrounded by each tooth root of the rack gear.
Utility model effect
According to the utility model, tooth pitch can be prevented because of caused by quenching distortion irregular and the tooth of higher precision is provided
Bar.
Detailed description of the invention
Fig. 1 is for illustrating the embodiments of the present invention, rack bar exemplary perspective view.
Fig. 2 is the schematic diagram for showing the manufacturing process of the rack gear of rack bar of Fig. 1.
Fig. 3 is the schematic diagram for showing the manufacturing process of the rack gear of rack bar of Fig. 1.
Fig. 4 is that one for illustrating the quenching unit of the embodiments of the present invention, rack bar is exemplary cross-sectional
View.
Fig. 5 is the longitudinal section view of the quenching unit of Fig. 4.
Fig. 6 is the top view of rack gear the constraint tool of the quenching unit of Fig. 4.
Fig. 7 is the top view of the constraint tool other than rack gear the constraint tool of the quenching unit of Fig. 4.
Fig. 8 is the top view of the variation of rack gear the constraint tool of Fig. 6.
Fig. 9 is to show the schematic diagram of the evaluation method of tooth pitch of rack gear.
Figure 10 is to show the evaluation result of the tooth pitch of rack gear of the rack bar quenched by the quenching unit of Fig. 4
Curve graph.
Figure 11 is the cross-sectional view of another variation of rack gear the constraint tool of Fig. 6.
Figure 12 is to show the rack bar quenched by the quenching unit including rack gear the constraint tool of Figure 11
Rack gear tooth pitch evaluation result curve graph.
Figure 13 is the schematic diagram of transfer.
Figure 14 is the schematic diagram of the engagement between the rack-and-pinion shown in transfer.
Figure 15 is the schematic diagram of the engagement between the rack-and-pinion shown in transfer.
Figure 16 is another exemplary sectional elevation for illustrating the embodiments of the present invention, quenching unit.
Figure 17 is the longitudinal section view of the quenching unit of Figure 16.
Figure 18 is the exemplary schematic diagram to be pressurizeed by the pressing mechanism of Figure 17.
Figure 19 is another exemplary schematic diagram to be pressurizeed by the pressing mechanism of Figure 17.
Symbol description
1: pinion gear
2: bearing
3: bearing
10: rack bar
11: shaft member
12: rack gear
13: plat part
20: mold
21: upper mold
22: lower die
23: rack tooth mould
24: forming face
25: plug
26: push rod
27: push rod
30: bar
100: quenching unit
101: rack gear the constraint tool
102: the constraint tool
103: the constraint tool
104: the constraint tool
105: collet
111: coolant liquid supply chamber
112: ejection section
113: coolant liquid supply chamber
114: ejection section
115: coolant liquid introducing port
116: cowling panel
120: front end face
121: coolant liquid spray tank
130: front end face
131: coolant liquid spray tank
132: groove
201: rack gear the constraint tool
212: ejection section
220: front end face
221: coolant liquid jet port
301: rack gear the constraint tool
312: ejection section
320: front end face
321: coolant liquid spray tank
322: recess portion
400: quenching unit
401: the constraint tool
401: rack gear the constraint tool
402: the constraint tool
403: the constraint tool
404: the constraint tool
412: ejection section
414: ejection section
420: front end face
421: coolant liquid spray tank
430: front end face
431: coolant liquid spray tank
440: pressing mechanism
441: push part
442: position-regulation portion
443: threaded portion
444: locking nut
Ai: annular region
B: it is pushed position
D: axle base
H: distance over bar size
W: groove width
Specific embodiment
Fig. 1 shows an example for illustrating the rack bar of the utility model embodiment.
Rack bar 10 is the rack bar made of the hollow shaft member 11 with circular section shape, and in shaft member 11
Rack gear 12 is formed in partial sector in length.Rack bar 10 is manufactured for example, by using following mode.
Shaft member 11 is the hollow shaft member such as made of the steel JIS-S 45C.As shown in Fig. 2, in the length of shaft member 11
Partial sector is crushed by punch process to flat condition is become near inside pitch line length, is formed along the axially extending of shaft member 11
Plat part 13.
Next, as shown in figure 3, a part of the shaft member 11 including plat part 13 is kept by mold 20.Mold 20
Including upper mold 21 and lower die 22.Upper mold 21 and lower die 22 are opened and closed using clamping (not shown), and along the vertical direction
Clamping shaft member 11 and the periphery for keeping shaft member 11.Rack tooth mould 23 is removably mounted in upper mold 21, rack tooth mould 23 with
The state that the outer surface of the general planar of plat part 13 abuts is fixed.In the rack tooth mould of the appearance face contact with plat part 13
Multiple tooth sockets for shaping rack gear 12 are provided in 23 forming face 24.
In the state that rack tooth mould 23 is abutted with plat part 13, plug 25 is inserted by the opening of the one end side of shaft member 11
Enter in shaft member 11, and is pressed into the inside of plat part 13 by push rod 26.Also, the plug 25 being pressed into is by from shaft member
The push rod 27 of the opening insertion of 11 the other end side pushes back, and is discharged from shaft member 11.In plug 25 in the whole of plat part 13
During moving back and forth in a length, the material of plat part 13 is squeezed by plug 25 and to 23 Plastic Flow of rack tooth mould.It is logical
Cross plug 25 gradually to be replaced by biggish plug, and the indentation of plug 25 be repeated, and make the material of plat part 13 by
It is gradually deep into the tooth socket of forming face 24 of rack tooth mould 23, the shape of forming face 24 is transferred to plat part 13, in plat part
13 form rack gear 12.
The shaft member 11 of rack gear 12 is formed with as needed to be corrected the bending generated with shaping of teeth and externally
Circumferential surface implements grinding, and implements to quench to improve the hardness of rack gear 12.Heating when shaft member 11 quenches can be for example, by height
Frequency induction heating carries out, but is not limited to high-frequency induction heating.In addition, the heated perimeter of shaft member 11 is not particularly limited, as long as
Heated perimeter includes the partial sector (hereinafter referred to rack gear formation section) for being formed with rack gear 12, can be only rack-shaped
At section, it is also possible to the overall length of shaft member 11.
Here, due to the tooth pitch as the rack gear caused by quenching becomes irregular, when can enumerate quenching
Cooling velocity becomes this uneven factor at each tooth root of rack gear.That is, working as heating temperature of each tooth root from quenching
When cooling, the contraction of thermal expansion corresponding amount occurs, but first cooling part is shunk before other parts.On the other hand, after
Cooling part is made the increased part of intensity be influenced to cause to shrink to be restricted by first cooling.As a result, in each tooth root
Cooling earlier partially place tooth pitch narrow, tooth pitch broadens at the later part of cooling.Further more, the quenching of rack bar is usually not
It is only carried out by heating rack gear and the entire periphery of section is formed by heating rack gear to carry out.Therefore, pass through each tooth root
And the annular region A of the periphery of section is formed around rack geariThe unevenness of the cooling velocity of (i=1~n) (referring to Fig. 1) also influences
Rack tooth away from it is irregular.
It is cold from the multiple small hole injections arranged on the length direction of rack bar in the quenching unit of existing rack bar
But liquid, but the corresponding relationship between aperture and the tooth of rack gear, in other words, aperture and the annular region A for passing through tooth rooti(i=1~
N) corresponding relationship is not constant.Although coolant liquid is in all annular region AiFlowing in (i=1~n), but ought carefully see
When examining, it just can be appreciated that coolant liquid is applied to each annular region AiThe mode of (i=1~n) is non-uniform.For example, in a part
Coolant liquid directly hits annular region in annular region, and the coolant liquid of other annular regions is hit in a part of annular region then
Detour enters.It is considered that the uneven applying mode of this coolant liquid causes cooling velocity when quenching uneven, and tooth
The tooth pitch of item becomes uneven.Therefore, the quenching unit of rack bar described below is a kind of to be equably ejected into coolant liquid
Each annular region Ai(i=1~n) and inhibit the irregular device of the tooth pitch of rack gear.
Further, since the cross sectional shape that rack gear forms section is asymmetric, therefore rack bar is easy to produce due to quenching
Raw bending.Particularly, different from the rack bar made of solid shaft member, its material internal of rack bar made of hollow shaft member
Restraining force is weaker relative to bending force, therefore is easy to happen bending.It is therefore preferable that constraining while cooling rack bar.Under
The quenching unit for the rack bar that face illustrates is to have both such constraint means to prevent the curved device of rack bar.
Fig. 4 and Fig. 5 shows the quenching unit of rack bar 10.
Quenching unit 100 has multiple the constraint tools, which is used to form section in the rack gear of rack bar 10
Section is formed to rack gear from multiple radial directions in whole length to constrain.In the example depicted in fig. 4, although having around rack gear
Four the constraint tools 101~104 that the central axis of bar 10 is set with 90 ° of intervals, but the quantity of the constraint tool is not special
Limitation, such as three the constraint tools can also be set with 120 ° of intervals around the central axis of rack bar 10.
The constraint tool 101 is arranged on the lower section for the rack bar 10 that rack gear 12 is arranged downward, and contacts with rack gear 12.
Hereinafter, the constraint tool 101 is especially referred to as rack gear the constraint tool.The constraint tool 102 is arranged on the top of rack bar 10,
The constraint tool 103,104 is arranged on the left and right side of rack bar 10.Pairs of rack gear the constraint tool 101 in the up-down direction
And at least one the constraint tool in the constraint tool 102 is installed on the pressurizing devices such as unshowned hydraulic cylinder.In addition,
At least one the constraint tool in horizontal direction in pairs of the constraint tool 103,104 is also mounted on unshowned hydraulic cylinder etc.
On pressurizing device.By rack gear the constraint tool 101 and the constraint tool 102~104, to pressurize along the vertical direction with horizontal direction
State section formed to the rack gear of rack bar 10 constrain.
Rack gear the constraint tool 101 has coolant liquid supply chamber 111 in inside, and the rack gear the constraint tool 101 has use
The ejection section 112 on rack gear 12 is ejected into the coolant liquid for being fed into coolant liquid supply chamber 111.Other the constraint tools 102~
104 also have coolant liquid supply chamber 113 in inside respectively, and the constraint tool 102~104 is respectively provided with for by coolant liquid
The ejection section 114 being ejected on opposed with each the constraint tool position in the rack gear formation section of rack bar 10.Furthermore scheming
In example shown in 4, it is additionally provided with and coolant liquid is ejected into four collets 105 that rack gear forms section, and collet 105 is divided
It is not arranged between adjacent two the constraint tool in four the constraint tools 101~104.In this way it is possible to freely
In addition increase and form the cooling collet 105 of section for auxiliary rack.
Fig. 6 shows rack gear the constraint tool 101, and Fig. 7 shows the constraint tool 102.
As shown in Figure 5 and Figure 6, rack gear the constraint tool 101 has the front end face 120 contacted with rack gear 12, and front end face
120 rack gears for being formed to have rack bar 10 form the length of section or more.Also, the shape over the whole length of front end face 120
As flat shape, and contact the tooth top of whole teeth of rack gear 12.The ejection section 112 of rack gear the constraint tool 101 has preceding
The coolant liquid spray tank 121 that end face 120 is open.Coolant liquid spray tank 121 along rack bar 10 length direction in front end face 120
Width direction central portion extends, and is formed as the length that rack gear forms section or more.Cooling inside rack gear the constraint tool 101
The rack gear that liquid supply chamber 111 is again formed as rack bar 10 forms the length of section or more, and coolant liquid spray tank 121 is substantially
It is connected in whole length with coolant liquid supply chamber 111.
The coolant liquid sprayed from coolant liquid spray tank 121 is in curtain shape, is intersected with whole teeth of rack gear 12, and hit rack bar
10 rack gear forms section.That is, directly hitting whole teeth of rack gear 12 from the coolant liquid that coolant liquid spray tank 121 sprays
Root, whole tooth roots are cooled under the same conditions.Coolant liquid flows to two sides along each tooth root, and each tooth root is over the entire width
Equably it is cooled.Therefore, although a coolant liquid spray tank is arranged in the mode opposed with the width direction central portion of tooth root
121 are sufficient, but more than two coolant liquid spray tanks 121 can also be arranged parallel to each other.
As shown in figure 5 and figure 7, the constraint tool 102, which has, forms area with the rack gear other than rack gear 12 of rack bar 10
The front end face 130 of the periphery face contact of section, and front end face 130 is formed the length of the rack gear formation section of rack bar 10 or more
Degree.The ejection section 114 of the constraint tool 102 has the coolant liquid spray tank 131 and multiple grooves 132 being open in front end face 130.It is cold
But liquid spray tank 131 extends along the length direction of rack bar 10 in the width direction central portion of front end face 130, and is formed
Rack gear forms the length of section or more.Coolant liquid supply chamber 113 inside the constraint tool 102 is also formed as the tooth of rack bar 10
Item forms the length of section or more, and coolant liquid spray tank 131 is connected to coolant liquid supply chamber 113 over the whole length.
Multiple grooves 132 are provided spaced apart along the length direction of front end face 130, and the side to intersect with coolant liquid spray tank 131
Formula extends in the width direction of front end face 130.
The coolant liquid sprayed from coolant liquid spray tank 131 is in curtain shape, with whole annular region Ai(i=1~n) intersects, and
The rack gear for hitting rack bar 10 forms section.That is, directly hitting whole from the coolant liquid that coolant liquid spray tank 131 sprays
Annular region Ai(i=1~n), whole annular region Ai(i=1~n) is cooled under the same conditions.Coolant liquid is along each groove
132 flow to two sides and are discharged.Preferably, the spacing of multiple grooves 132 and annular region AiThe spacing of (i=1~n), i.e. tooth
The tooth pitch of item 12 is identical, and each groove 132 is along each annular region Ai(i=1~n) setting.Thus, it is possible to make each annular region
AiThe further equalization of the cooling condition of (i=1~n).
The constraint tool 103 and the respective coolant liquid supply chamber 113 of the constraint tool 104 and ejection section 114 be configured to about
The coolant liquid supply chamber 113 and ejection section 114 of beam tool 102 are identical.It is respective cold from the constraint tool 103 and the constraint tool 104
But the coolant liquid that liquid spray tank 131 sprays also with whole annular region Ai(i=1~n) intersects, and forms section in rack gear
Rack bar 10, whole annular region A are hit in whole lengthi(i=1~n) is cooled under the same conditions.Furthermore it constrains
The quantity of the respective coolant liquid spray tank 131 of tool 102~104 may be one or may be two or more.
In this way, coolant liquid is equably ejected into from rack gear the constraint tool 101 and other the constraint tools 102~104
Across the annular region A of each tooth root of rack gear 12i(i=1~n), to make annular region AiThe cooling velocity of (i=1~n) is equal
Homogenize, and inhibit rack gear 12 tooth pitch it is irregular.Further, since passing through rack gear the constraint tool 101 and other constraints
Rack gear is formed in the state that section is constrained from multiple radial directions and implements to quench to rack bar 10 by tool 102~104, therefore
Also inhibit the bending generated with quenching.
Here, in addition to making annular region AiExcept the cooling velocity homogenization of (i=1~n), it is also necessary to make to spray from coolant liquid
The amount of injection for penetrating the coolant liquid of the injection of slot 121,131 homogenizes in the whole length of slot.In order to make the amount of injection of coolant liquid exist
It is homogenized in the whole length of slot, therefore in the example depicted in fig. 5, multiple coolings is set in coolant liquid supply chamber 111,113
Liquid introducing port 115, in addition, cowling panel 116 is arranged in the inside of coolant liquid supply chamber 111,113.
For example, the inside of coolant liquid supply chamber 111 is rectified plate 116 and is separated into two skies in rack gear the constraint tool 101
Between.Coolant liquid spray tank 121 is connected to a space in the two spaces separated by cowling panel 116, and multiple coolant liquids
Introducing port 115 is connected to another space.Cowling panel 116 is the portion for being equipped with multiple apertures evenly dispersedly for example in entire surface
Part, and when the coolant liquid imported from coolant liquid introducing port 115 passes through cowling panel 116, flow resistance acts on coolant liquid.As a result,
The homogenization of the flow velocity reduction and pressure inside coolant liquid supply chamber 111 is realized, and sprayed from coolant liquid spray tank 121
The amount of injection of coolant liquid homogenizes in the whole length of slot.
Furthermore the means for homogenizing the amount of injection of coolant liquid in the whole length of slot are not limited to be arranged multiple cold
But liquid introducing port 115 and setting cowling panel 116.For example, the internal capacity of coolant liquid supply chamber 111,113 can increase as much as possible
Add, to realize the homogenization of the flow velocity reduction and pressure inside coolant liquid supply chamber 111,113.
In addition, in order to homogenize the amount of injection of coolant liquid in the whole length of slot, coolant liquid spray tank 121,131
Groove width w is important.If groove width w is too big, the shunting that may cause coolant liquid is become inadequate, and the injection of coolant liquid
Amount becomes uneven.Although also related with the pressure of coolant liquid inside coolant liquid supply chamber 111,113, groove width w is preferred
For 0.2mm or more and 0.5mm or less.
Fig. 8 shows the variation of above-mentioned rack gear the constraint tool 101.
In rack gear the constraint tool 201 shown in Fig. 8 and above-mentioned rack gear the constraint tool 101, for coolant liquid to be ejected into tooth
The structure of the ejection section of item 12 is different.The ejection section 212 of rack gear the constraint tool 201 has in the front end face contacted with rack gear 12
Multiple coolant liquid jet ports 221 of 220 openings.The rack gear that front end face 220 is formed rack bar 10 forms the length of section or more
Degree, and front end face is arranged in separating fixed intervals on the length direction of front end face 220 in multiple coolant liquid jet ports 221
In 220 whole length.The spacing of multiple coolant liquid jet ports 221 is identical as the tooth pitch of rack gear 12, and each coolant liquid is sprayed
Mouth 221 and each tooth root of rack gear 12 overlap.The coolant liquid sprayed from each coolant liquid jet port 221 directly hits rack gear 12
Each tooth root, each tooth root are cooled at identical conditions.Furthermore multiple coolant liquid jet ports 221 can be set in a row, can also
To be arranged to multirow.
Although being not shown, in the respective ejection section 114 of above-mentioned the constraint tool 102~104, the spray of spray cooling liquid
Mouth can also be made of multiple jet ports to replace slot.In this case, the tooth pitch of the spacing of multiple jet ports and rack gear 12
It is identical.The coolant liquid sprayed from each jet port directly hits each annular region Ai(i=1~n), each annular region Ai(i=1~n)
It is cooled under the same conditions.
In this example, coolant liquid is equably ejected into the annular region A of each tooth root across rack gear 12i(i=1~
n).Make annular region A as a result,iThe cooling velocity of (i=1~n) homogenizes, and inhibit rack gear 12 tooth pitch it is irregular.
Fig. 9 shows the evaluation method of the distance over bar size of the tooth of rack gear 12, Figure 10 show the tooth of rack gear 12 across stick
An example of the evaluation result of carpenters square cun.In Figure 10, chain-dotted line indicates the evaluation result before quenching, solid line indicate through Fig. 4 and
Quenching unit 100 shown in fig. 5 implements evaluation result after the quenching in the case where quenching, and dotted line expression passes through existing quenching
Device implements evaluation result after the quenching in the case where quenching.
The outer diameter that the rack gear of quenched rack bar 10 forms section is 26mm, internal diameter 17mm, length 180mm.It is logical
It crosses high-frequency induction heating and rack gear formation section is heated to about 950 DEG C, and filled by quenching unit 100 and existing quenching
It sets to be quenched to the rack bar 10 after heating.Furthermore existing quenching unit is by Fig. 4 and quenching unit shown in fig. 5
Four the constraint tools 101~104 that the nozzle for spray cooling liquid is constituted in 100, by slot are replaced with to be made of multiple apertures
Device obtained from four the constraint tools of nozzle for spray cooling liquid, and the spacing of aperture is different from the tooth of rack gear 12
Away from.
When evaluating the tooth pitch of rack gear 12, as shown in figure 9, placing bar in the mode being embedded in the groove between tooth and tooth
(stick) 30, and the height and position h at the top of the outer peripheral surface of measuring rod 30, i.e., commented by so-called distance over bar measurement
Valence.When the interval between tooth and tooth becomes larger, bar 30 is deeply inserted in groove, and the height and position h of bar 30 is i.e. across stick
Carpenters square cun is lower.
As shown in Figure 10, before quenching, the distance over bar size of the tooth of rack gear 12 is uniform.As can be seen that with by existing
The rack bar 10 that some quenching units are quenched is compared, in the rack bar 10 quenched by quenching unit 100, tooth
The tooth pitch of item 12 is irregularly suppressed.
Figure 11 shows the variation of above-mentioned rack gear the constraint tool 101.
Rack gear the constraint tool 301 shown in Figure 11 and above-mentioned rack gear the constraint tool 101 are the difference is that with rack gear 12
The structure of the front end face of contact is different.The rack gear that the front end face 320 of rack gear the constraint tool 301 is formed as rack bar 10 forms section
Above length.Also, recess portion 322 is arranged on the length direction central portion of front end face 320, and front end face 320 removes recess portion
Be formed as flat shape except 322.Furthermore although the ejection section 312 of rack gear the constraint tool 301 and rack gear shown in fig. 6 constrain
The ejection section 112 of tool 101 similarly has coolant liquid spray tank 321, but can also be with rack gear the constraint tool shown in Fig. 8
201 ejection section 212 similarly has the multiple coolant liquid jet ports being arranged with spacing identical with the tooth pitch of rack gear 12.
The not peak contact with the tooth at the central portion of rack gear 12 in recess portion 322 of rack gear the constraint tool 301.In this feelings
Under condition, it is not pressurized along the vertical direction between rack gear the constraint tool 301 and the constraint tool 102 in the tooth of the central portion of rack gear 12
In the state of to rack bar 10 implement quench.As a result, rack gear 12 is formed as central portion as shown in the double dot dash line in Figure 12
Relatively large sized so-called crown of distance over bar.Furthermore Figure 12 shows the evaluation of the tooth pitch of rack gear 12 same as Figure 10
As a result.In Figure 12, chain-dotted line indicates the evaluation result before quenching, and solid line is indicated by Fig. 4 and quenching unit shown in fig. 5 100
Implement quenching in the case where quenching after evaluation result.
Here, the function of crown rack gear is illustrated.Figure 13 shows the schematic structure of the transfer of vehicle, figure
14 and Figure 15 shows the movement for the pinion gear being engaged with rack.
As shown in figure 13, in the transfer of vehicle, pinion gear 1 is rotatably supported by a pair of bearings 2,3, and also
It is connected in the steering shaft of unshowned vehicle.In general, the steering angle of vehicle be 0 °, i.e., under straight-going state with pinion gear 1 with
Rack bar 10 is installed in transfer by the mode of the tooth engagement of the central portion of rack gear 12.Pinion gear 1 is according to the behaviour of steering wheel
Make and rotate, the rack bar 10 engaged using rack gear 12 with pinion gear 1 is axially moveable with the rotation of pinion gear 1.
Under the central axis of pinion gear 1 and the rotary shaft unanimous circumstances of a pair of bearings 2,3, regardless of pinion gear 1 is revolved
Turn, the central axis of pinion gear 1 and the distance between the central axis of rack bar 10 are constant.However, due to the forming of pinion gear 1
The reasons such as error, the central axis of pinion gear 1 and the rotation axle offset of a pair of bearings 2,3, as shown in figure 14, along with pinion gear 1
Rotation, central axis and the distance between the central axis of rack gear 12 D of pinion gear 1 change.The axis of pinion gear 1 and rack gear 12
Between distance D influence operation steering wheel required for power, under normal circumstances, when axle base becomes larger, operate steering wheel needed for
Power become larger, responsiveness reduce.By the way that rack gear 12 is formed as crown, as shown in figure 15, in 0 ° of steering angle and its nearby make axis
Between distance D reduce.The responsiveness turned to from straight-going state is increased as a result,.
In this example, coolant liquid is equably ejected into from rack gear the constraint tool 301 and other the constraint tools 102~104
Across the annular region A of each tooth root of rack gear 12i(i=1~n) thereby inhibits the irregular of the tooth pitch of rack gear 12.In addition,
The tooth top of the tooth of the central portion of rack gear the constraint tool 301 and rack gear 12 is in contactless state, by being formed as being preced with rack gear 12
Shape, so as to which rack gear 12 is precisely formed as desired shape.
Furthermore the shape of rack gear 12 can change according to the specification for the transfer for being equipped with rack bar 10, be not limited to
It is crown.For example, rack gear 12 can also be formed the relatively large sized crown shape of distance over bar at both ends.When 12 quilt of rack gear
When being formed as crown shape, recess portion 322 is arranged on the length direction both ends of the front end face 320 of rack gear the constraint tool 301.
Figure 16 and Figure 17 shows the other examples of the quenching unit for illustrating the utility model embodiment.
According to above-mentioned quenching unit 100, since rack bar 10 is quenched in the state of being constrained by four the constraint tools
Fire, thus inhibit with quenching and generate bending, but quenching unit 400 shown in Figure 16 and Figure 17 be can be further
Inhibit the curved device generated with quenching.The quenching unit 400 has in the same manner as above-mentioned quenching unit 100 around tooth
The central axis of bar 10 with 90 ° of spaced four the constraint tools 401~404, and by this four the constraint tools 401~
404 and rack gear formed section whole length on from multiple diameters always constrain rack gear formed section.
Rack gear the constraint tool 401 has the ejection section 412 that coolant liquid is ejected into rack gear 12.Although ejection section 412 has
Be formed as rack bar 10 rack gear formed the above length of section coolant liquid spray tank 421, but also can have with rack gear
Multiple coolant liquid jet ports of the identical spacing setting of 12 tooth pitch.The constraint tool 402 has ejection section 414, the ejection section 414
Rack gear for coolant liquid to be ejected into rack bar 10 forms position opposed with the constraint tool 402 in section.Although injection
There is the rack gear for being formed as rack bar 10 to form the coolant liquid spray tank 431 of the above length of section in portion 414, but also can have
The multiple coolant liquid jet ports being arranged with spacing identical with the tooth pitch of rack gear 12.Other two the constraint tool 403,404 with about
Beam tool 402 is identical, and and the description is omitted.
Quenching unit 400 is also equipped with pressing mechanism 440, and pressing mechanism 440 hangs down along the length direction relative to rack bar 10
Straight direction pushes the position adjacent with the two sides of the rack gear of rack bar 10 formation section or side.In this example, rack bar 10
It is configured to make rack gear 12 downwards, and the quenching distortion caused by the cross sectional shape that rack gear forms section is asymmetric is main
Show as the bending in the up and down direction of rack bar 10.Therefore, pressing mechanism 440 has push part 441, the push part
441 are separately positioned on the end of the length direction two sides of pairs of along the vertical direction rack gear the constraint tool 401 and the constraint tool 402
Place.Rack gear the constraint tool 101 and the constraint tool 102 are driven by pressurizing devices such as hydraulic cylinders, when in the up-down direction to rack-shaped
When being constrained at section, the push part 441 of rack gear the constraint tool 401 and the constraint tool 402 and rack gear the constraint tool 401 and
The constraint tool 402 links, and pushes be pushed position B along the vertical direction.
The plus-pressure of pressing mechanism 440 can be adjusted respectively with the plus-pressure of rack gear the constraint tool 101 and the constraint tool 102
Section.The push part 441 of rack gear the constraint tool 401 has position-regulation portion 442, which is used for along rack gear about
Beam tool 401 adjusts the position of push part 441, the pushing of the constraint tool 402 with the contact direction (up and down direction) of rack gear 12
Component 441 also has position-regulation portion 442, which is used for the rack-shaped along the constraint tool 402 and rack bar 10
The position of push part 441 is adjusted at the contact direction (up and down direction) of section.Position-regulation portion 442 is by being formed in push part
Threaded portion 443 and locking nut 444 on 441 are constituted.The push part 441 of rack gear the constraint tool 401 is opposite by rotating
It moves forward and backward in rack gear the constraint tool 401, and is arranged to the front end face from rack gear the constraint tool 401 (with rack gear 12
Contact surface) 420 suitably prominent or retrogressings.Similarly, the push part 441 of the constraint tool 402 is by rotating relative to about
Beam tool 402 moves forward and backward, and is arranged to the front end face (contact surface of section is formed with rack gear) from the constraint tool 402
430 suitably prominent or retrogressings.By changing the overhang of push part 441, so that the plus-pressure of pressing mechanism 440 can be with
The plus-pressure of rack gear the constraint tool 101 and the constraint tool 102 is adjusted respectively.
Pressing mechanism 440 applies the plus-pressure to offset the quenching distortion generated in rack bar 10 to rack bar 10, from
And inhibit the bending of the rack bar 10 generated with quenching.For example, the front end of push part 441 is arranged on just and completely
The position that straight rack bar 10 contacts, and when rack bar 10 is bent along the direction contacted with push part 441, pressuring machine
Structure 440 applies plus-pressure to rack bar 10.
Figure 18 and Figure 19 shows the pressurization example of the rack bar 10 using pressing mechanism 440.
Figure 18 shows being pushed away to 10 two sides of rack bar of push part 441 by the two sides of rack gear the constraint tool 401
Splenium position B applies upward stressed situation.In this case, bending force as shown by arrows in figure acts on rack bar
On 10.Certainly, if using the two sides of the constraint tool 402 push part 441 and invert stressed action direction, it is curved
Bent is contrary.Since rack bar 10 has the deformation tendency towards curving, so the pressurization under mode shown in Figure 18
It is effective.
Furthermore it as shown in figure 19, can also be by the push part 441 of the side of rack gear the constraint tool 401 come to one
It is pushed position B and applies upward plus-pressure, and by the push part of the side of the constraint tool 402 441 come to another quilt
It pushes position B and applies downward plus-pressure.In this case, bending force as shown by arrows in figure acts on rack bar 10
On.In addition it is also possible to by the push part 441 of the side of rack gear the constraint tool 401 or the constraint tool 402 come only to a quilt
It pushes position B and applies plus-pressure.
In this way, pressing mechanism 440 can be adjusted according to the occurrence tendency of the quenching distortion of rack bar 10 pattern of pressure and
Plus-pressure.In actually quenching, for example, quenching can be repeated by changing pattern of pressure and stressed setting, and
Product, which is found, by repetition test is bent into the smallest condition.In addition it is also possible to pass through rack gear about without using pressing mechanism 440
Beam tool 401 and other the constraint tools 402~404 constrain rack bar 10 and carry out test quenching, then by quenching test
The bending occurred in fire is corrected to set the pattern of pressure of pressing mechanism 440 and plus-pressure to implement main quenching.
Furthermore in push part 441, pairs of in the up-down direction rack gear the constraint tool 401 and constraint can be replaced
Tool 402 and pairs of in the horizontal direction the constraint tool 403 and the constraint tool 404 is set, or in addition to being arranged in upper and lower
The constraint tool 403 pairs of in the horizontal direction is also set up except pairs of rack gear the constraint tool 401 and the constraint tool 402 upwards
With the constraint tool 404.In addition, push part 441 can also be provided separately with rack gear the constraint tool 401 and the constraint tool 402, and
It is driven by independent pressurizing device.
As described above, the quenching unit of rack bar disclosed in this specification is the part in the length of hollow shaft member
The quenching unit of the rack bar of rack gear is formed in section, which has multiple the constraint tools, the constraint tool quilt
It is configured in the whole length of the partial sector constrain the partial sector being heated from multiple radial directions, it is multiple
Described the constraint tool is respectively provided with ejection section, and the ejection section is configured to be ejected into coolant liquid in the partial sector and be somebody's turn to do
The opposed position of the constraint tool, the ejection section are configured to for the coolant liquid being uniformly ejected at least through the rack gear
Each tooth root and around the partial sector periphery multiple annular regions.
In addition, the ejection section has spray tank, and the spray tank is described in quenching unit disclosed in this specification
Extend and be formed as the length of the partial sector or more on the length direction of rack bar.
In addition, in quenching unit disclosed in this specification, the ejection section has multiple jet ports, the jet port with
It is arranged on the length direction for being spaced in the rack bar equal with the tooth pitch of the rack gear.
In addition, multiple described the constraint tools include to contact with the rack gear in quenching unit disclosed in this specification
Rack gear the constraint tool for constituting of mode, in described rack gear the constraint tool be provided with more than one on the contact surface of the rack gear
Recess portion.
In addition, the recess portion is arranged on the length direction of the contact surface in quenching unit disclosed in this specification
Central portion on.
In addition, having pressing mechanism in quenching unit disclosed in this specification, the pressing mechanism is configured to institute
Position adjacent with the two sides of the partial sector or side in shaft member is stated on the direction vertical relative to the length direction
It is pushed.
In addition, the pressing mechanism, which has, to be arranged in the multiple constraint work in quenching unit disclosed in this specification
More than one push part at least one the constraint tool in tool, the push part have position-regulation portion, institute's rheme
It sets adjustment portion and is configured to contact direction pair along the described the constraint tool and the partial sector for being provided with the push part
The position of the push part is adjusted.
Claims (7)
- It is to be formed with the rack bar of rack gear in the partial sector in the length of hollow shaft member to quench 1. a kind of quenching unit Fiery device, the quenching unit be characterized in that,Have multiple the constraint tools, described the constraint tool is configured in the whole length of the partial sector from multiple radial directions The partial sector being heated is constrained,Multiple described the constraint tools are respectively provided with ejection section, and the ejection section is configured to for coolant liquid to be ejected into the part area The opposed position of the Duan Zhongyu the constraint tool,The ejection section is configured to for the coolant liquid being uniformly ejected into each tooth root at least through the rack gear and surrounds institute State multiple annular regions of the periphery of partial sector.
- 2. quenching unit as described in claim 1, whereinThe ejection section has spray tank, and the spray tank extends on the length direction of the rack bar and is formed as described Length more than partial sector.
- 3. quenching unit as described in claim 1, whereinThe ejection section has multiple jet ports, and the jet port is spaced in the rack gear with equal with the tooth pitch of the rack gear It is arranged on the length direction of bar.
- 4. quenching unit as described in claim 1, whereinMultiple described the constraint tools include the rack gear the constraint tool for being configured to contact with the rack gear,More than one recess portion is provided on the contact surface with the rack gear of described rack gear the constraint tool.
- 5. quenching unit as claimed in claim 4, whereinThe recess portion is arranged on the central portion of the length direction of the contact surface.
- 6. such as quenching unit according to any one of claims 1 to 5, whereinHave a pressing mechanism, the pressing mechanism be configured to by the shaft member with the two sides of the partial sector or side phase Adjacent position is pushed on the direction vertical relative to the length direction.
- 7. quenching unit as claimed in claim 6, whereinThe pressing mechanism is pushed away with more than one at least one the constraint tool being arranged in multiple described the constraint tools Splenium part,The push part has position-regulation portion, and the position-regulation portion is configured to along the institute for being provided with the push part The constraint tool is stated the position of the push part is adjusted with the contact direction of the partial sector.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2018-179177 | 2018-09-25 | ||
| JP2018179177A JP7101092B2 (en) | 2018-09-25 | 2018-09-25 | Quenching equipment and quenching method for rack bars |
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| Publication Number | Publication Date |
|---|---|
| CN209352956U true CN209352956U (en) | 2019-09-06 |
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| CN201811280455.8A Active CN110938736B (en) | 2018-09-25 | 2018-10-30 | Quenching device and quenching method for rack bar |
| CN201821779067.XU Active CN209352956U (en) | 2018-09-25 | 2018-10-30 | The quenching unit of rack bar |
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| CN201811280455.8A Active CN110938736B (en) | 2018-09-25 | 2018-10-30 | Quenching device and quenching method for rack bar |
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| JP (1) | JP7101092B2 (en) |
| CN (2) | CN110938736B (en) |
| WO (1) | WO2020066805A1 (en) |
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|---|---|---|---|---|
| CN110938736A (en) * | 2018-09-25 | 2020-03-31 | 高周波热錬株式会社 | Quenching device and quenching method for rack bar |
Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN112430718A (en) * | 2020-12-18 | 2021-03-02 | 辉县市恒兴金属制品有限公司 | Quenching process for impeller blade of grass discharge fan of peanut pickup machine |
| CN112831637B (en) * | 2021-01-08 | 2022-12-16 | 欧隆泵业股份有限公司 | Automatic quenching machining mechanism for water pump impeller |
| CN113416824B (en) * | 2021-06-02 | 2022-09-13 | 重庆南雁实业集团龙剑机械制造有限公司 | Gearbox gear shaft quenching tool |
| CN114438297B (en) * | 2022-02-07 | 2023-09-08 | 铜川铝业世茂铸铝有限公司 | Online water-cooling quenching device for aluminum profile and aluminum profile production line |
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| JPS62180018A (en) * | 1986-01-31 | 1987-08-07 | Yamada Seisakusho:Kk | High frequency quenching method for steering rack |
| JP3865451B2 (en) * | 1997-03-12 | 2007-01-10 | 電気興業株式会社 | High frequency direct current quenching equipment for rack bar |
| JP3007338B1 (en) | 1998-10-12 | 2000-02-07 | 高周波熱錬株式会社 | Method and apparatus for restraining and quenching deformed rod-shaped members |
| JP4000234B2 (en) | 1999-06-28 | 2007-10-31 | 高周波熱錬株式会社 | Hardening method and apparatus for rack bar |
| JP4235336B2 (en) * | 2000-02-25 | 2009-03-11 | 電気興業株式会社 | Induction hardening method of rack bar and induction hardening apparatus thereof |
| JP2004131823A (en) * | 2002-10-11 | 2004-04-30 | Denki Kogyo Co Ltd | Method and apparatus for induction-hardening rack bar |
| JP2004307967A (en) | 2003-04-09 | 2004-11-04 | Koyo Seiko Co Ltd | Induction hardening and tempering device |
| JP2004315851A (en) * | 2003-04-11 | 2004-11-11 | Denki Kogyo Co Ltd | Method and apparatus for induction hardening of rack bar |
| JP5072234B2 (en) | 2006-02-21 | 2012-11-14 | 株式会社ミヤデン | Rack bar induction hardening equipment |
| EP1972395B1 (en) * | 2007-03-20 | 2010-01-20 | Neturen Co., Ltd. | Apparatus and method for reducing a hollow rack end diameter and hollow rack thus obtained |
| JP2007262584A (en) | 2007-06-07 | 2007-10-11 | Showa Corp | Method and apparatus for quenching hollow rack |
| CN101899561B (en) * | 2010-08-03 | 2014-09-03 | 宫电高周波设备（上海）有限公司 | Rack quenching clamp |
| JP6408819B2 (en) * | 2014-07-28 | 2018-10-17 | 高周波熱錬株式会社 | Method for producing hollow rack bar |
| JP6628398B2 (en) | 2015-09-15 | 2020-01-08 | 株式会社ミヤデン | Electric heating device for steering rack bar |
| JP6660752B2 (en) * | 2016-02-04 | 2020-03-11 | 高周波熱錬株式会社 | Quenching device |
| JP6707492B2 (en) | 2017-04-14 | 2020-06-10 | 日東工器株式会社 | Pipe fitting member and pipe fitting device |
| JP7101092B2 (en) * | 2018-09-25 | 2022-07-14 | 高周波熱錬株式会社 | Quenching equipment and quenching method for rack bars |
-
2018
- 2018-09-25 JP JP2018179177A patent/JP7101092B2/en active Active
- 2018-10-30 CN CN201811280455.8A patent/CN110938736B/en active Active
- 2018-10-30 CN CN201821779067.XU patent/CN209352956U/en active Active
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- 2019-09-18 WO PCT/JP2019/036635 patent/WO2020066805A1/en active Application Filing
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110938736A (en) * | 2018-09-25 | 2020-03-31 | 高周波热錬株式会社 | Quenching device and quenching method for rack bar |
| CN110938736B (en) * | 2018-09-25 | 2022-08-09 | 高周波热錬株式会社 | Quenching device and quenching method for rack bar |
Also Published As
| Publication number | Publication date |
|---|---|
| JP7101092B2 (en) | 2022-07-14 |
| CN110938736A (en) | 2020-03-31 |
| WO2020066805A1 (en) | 2020-04-02 |
| CN110938736B (en) | 2022-08-09 |
| JP2020050897A (en) | 2020-04-02 |
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