CN105570260A - Noise reducing pin - Google Patents
Noise reducing pin Download PDFInfo
- Publication number
- CN105570260A CN105570260A CN201610000757.XA CN201610000757A CN105570260A CN 105570260 A CN105570260 A CN 105570260A CN 201610000757 A CN201610000757 A CN 201610000757A CN 105570260 A CN105570260 A CN 105570260A
- Authority
- CN
- China
- Prior art keywords
- pin
- shell
- elastic card
- diameter
- noise reduction
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
- 241001136800 Anas acuta Species 0.000 claims abstract description 12
- 229920003023 plastic Polymers 0.000 claims abstract description 10
- 239000004033 plastic Substances 0.000 claims abstract description 10
- 210000000078 claw Anatomy 0.000 claims description 17
- 210000003205 muscle Anatomy 0.000 claims description 17
- 239000012634 fragment Substances 0.000 claims description 5
- HCHKCACWOHOZIP-UHFFFAOYSA-N Zinc Chemical compound [Zn] HCHKCACWOHOZIP-UHFFFAOYSA-N 0.000 claims description 4
- 229910052725 zinc Inorganic materials 0.000 claims description 4
- 239000011701 zinc Substances 0.000 claims description 4
- 239000002184 metal Substances 0.000 abstract description 21
- 229910052751 metal Inorganic materials 0.000 abstract description 21
- 238000009434 installation Methods 0.000 abstract description 6
- 238000000034 method Methods 0.000 description 8
- 230000002159 abnormal effect Effects 0.000 description 6
- 230000035939 shock Effects 0.000 description 6
- 238000006073 displacement reaction Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 238000010008 shearing Methods 0.000 description 2
- 229910000831 Steel Inorganic materials 0.000 description 1
- 238000009825 accumulation Methods 0.000 description 1
- 238000005260 corrosion Methods 0.000 description 1
- 230000007797 corrosion Effects 0.000 description 1
- 229920002457 flexible plastic Polymers 0.000 description 1
- 238000011900 installation process Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000010297 mechanical methods and process Methods 0.000 description 1
- 230000005226 mechanical processes and functions Effects 0.000 description 1
- 239000010959 steel Substances 0.000 description 1
Classifications
-
- 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
- F16B—DEVICES FOR FASTENING OR SECURING CONSTRUCTIONAL ELEMENTS OR MACHINE PARTS TOGETHER, e.g. NAILS, BOLTS, CIRCLIPS, CLAMPS, CLIPS OR WEDGES; JOINTS OR JOINTING
- F16B21/00—Means for preventing relative axial movement of a pin, spigot, shaft or the like and a member surrounding it; Stud-and-socket releasable fastenings
- F16B21/06—Releasable fastening devices with snap-action
- F16B21/08—Releasable fastening devices with snap-action in which the stud, pin, or spigot has a resilient part
- F16B21/086—Releasable fastening devices with snap-action in which the stud, pin, or spigot has a resilient part the shank of the stud, pin or spigot having elevations, ribs, fins or prongs intended for deformation or tilting predominantly in a direction perpendicular to the direction of insertion
-
- 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
- F16B—DEVICES FOR FASTENING OR SECURING CONSTRUCTIONAL ELEMENTS OR MACHINE PARTS TOGETHER, e.g. NAILS, BOLTS, CIRCLIPS, CLAMPS, CLIPS OR WEDGES; JOINTS OR JOINTING
- F16B41/00—Measures against loss of bolts, nuts, or pins; Measures against unauthorised operation of bolts, nuts or pins
Landscapes
- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Sewing Machines And Sewing (AREA)
- Vehicle Body Suspensions (AREA)
Abstract
The invention relates to a noise reducing pin. The noise reducing pin comprises a metal pin; a metal pin includes a pin head, a pin neck, a pin body and a pin tail arranged in sequence from top to bottom; the diameter of the pin tail is larger than the diameter of the pin body; the diameter of the pin body is larger than the diameter of the pin neck; the diameter of the lower part of the pin head is larger than the diameter of the pin neck and not larger than the diameter of the pin body; a shell is a cylindrical plastic part; a cavity matched with the metal pin is arranged in the shell; the middle part of the cavity is in interference fit with the pin body; a clamping jaw matched with the lower end surface of the pin head is arranged at the upper part of the cavity; an elastic clamping piece is arranged on the shell; the outer side wall of the elastic clamping piece is gradually projected outwards from top to bottom; when the outer side wall of the elastic clamping piece is extruded, the elastic clamping piece is elastically deformed to the internal of the shell; the pin neck and the elastic clamping piece are correspondingly arranged; and an outwards projected rib is vertically arranged on the outer side wall, below the elastic clamping piece, of the shell. The noise reducing pin is convenient for installation, and can prevent generation of noise.
Description
Technical field
The present invention relates to auto parts and components, be specifically related to a kind of noise reduction pin.
Background technique
Pin is usually for being connected and fixed two parts, and conventional pin is made of metal and needs resilient clip to coordinate and can be connected and fixed two parts, and the joint that pin is downloaded in the effect of shearing force between the two elements can send shock abnormal sound.Such as: as depicted in figs. 1 and 2, the brake petal arm 1 of current automobile is generally connected by metal pins 3 and resilient clip 4 with booster shift fork 2, the assembling of metal pins 3 needs two steps, first metal pins 3 is loaded brake petal arm 1 with the pin-and-hole on booster shift fork 2, again resilient clip 4 is snapped in the aperture on metal pins 3 and be fixed, in actual mechanical process, need the aperture on metal pins 3 to be turned to the angle being convenient to insert resilient clip 4 just can assemble, and resilient clip 4 small volume, easily drop, therefore the metal pins 3 of this structure causes assembling effort, consuming time.Simultaneously due to the error accumulation of perforate in the accuracy of manufacturing of metal pins 3 self and brake petal, brake master cylinder and vacuum booster, trample in the process of brake petal driver, at metal pins 3 place because the effect of shearing force can produce shock abnormal sound in various degree, affect driving experience and car load quality.
Summary of the invention
The object of the invention is to propose a kind of noise reduction pin, this noise reduction pin is easy for installation, can avoid producing noise simultaneously.
A kind of noise reduction pin of the present invention, comprise: metallic pin, described metallic pin comprises the plunger, pin neck, pin body and the pin tail that set gradually from top to bottom, the diameter of described pin tail is greater than the diameter of described pin body, the diameter of described pin body is greater than the diameter of described pin neck, the diameter of described plunger bottom is greater than the diameter of described pin neck and is not more than the diameter of described pin body, and the top of described plunger is provided with the first guide portion that diameter reduces from bottom to up gradually, shell, described shell is cylindrical circular working of plastics, the cavity matched with described metallic pin is provided with in described shell, the lower end of described shell is provided with the opening inserting described cavity for described metallic pin, the bottom of described shell is provided with the flange coordinated with the upper plane of described pin tail, the middle part of described cavity and described pin body interference fit, the top of described cavity is provided with the claw coordinated with the lower end surface of described plunger, described shell is provided with elastic card stator, the outer side wall of described elastic card stator is outwardly gradually from top to bottom, when the outer side wall of described elastic card stator is squeezed, resiliently deformable is there is in described elastic card stator to the inside of described shell, and can submerge in described shell completely in the bottom of described elastic card stator, described pin neck is corresponding with described elastic card stator to be arranged, for described elastic card stator provides space to described enclosure resiliently deformable, described shell is positioned at the muscle outer side wall under described elastic card stator is vertically provided with outwardly.
Adopt technique scheme, noise reduction pin of the present invention is inserted the pin-and-hole of two parts to realize the connection of two parts, metallic pin carries out the spacing of vertical direction by the claw on shell and flange, the spacing of substantially horizontal is realized by the middle part interference fit of pin body and cavity, after being assemblied in enclosure to make metallic pin, the displacement in vertical and substantially horizontal between metallic pin and shell, can not be there is; When noise reduction pin is assemblied in pin-and-hole, the elastic card stator on shell and flange lay respectively at the both sides of pin-and-hole, to realize noise reduction pin to be engaging in pin-and-hole, arrange elastic card stator and reduce assembling difficulty, improve efficiency of assembling; Shell is working of plastics, and is provided with muscle on the outer side wall of shell, is ensured the interference fit of noise reduction pin and pin-and-hole in assembly process by the distortion of muscle; So change to metal and plastic contacts by original metal and Metal Contact between noise reduction pin and pin-and-hole, fit system changes into interference fit by Spielpassung, thus the relative movement greatly reduced between two parts and the shock abnormal sound produced.
Further, described shell is provided with the opening portion corresponding with described elastic card stator, and the upper edge of described elastic card stator and the upper edge of described opening portion are connected as a single entity, other edge of described elastic card stator and described open part from.Adopt said structure, can there is resiliently deformable in the upper edge of elastic card stator, and elastic card stator can enter the inside of shell by opening portion.
Further, described shell is provided with two described elastic card stators, and two described elastic card stators are oppositely arranged centered by the central axis of described shell.Adopt said structure, what two elastic card stators can be firm is engaging in noise reduction pin in pin-and-hole.
Further, described claw is provided with the first plane for contacting with the lower end surface of described plunger, and the second plane for contacting with the outer side wall of described plunger.Adopt said structure, the displacement that the first plane restriction metallic pin is downward, the second plane restriction plunger is rocked.
Further, the top of described shell is provided with the second guide portion that diameter reduces from bottom to up gradually, and the top of described shell is provided with the groove extended from top to bottom, described groove and described cavity connects and the top portion of described shell is slit into two shell fragments.Adopt said structure, the second guide portion plays leading role, and two shell fragments resiliently deformable can occur, and is conveniently assembled in pin-and-hole by noise reduction pin.
Further, described claw is two, and two described claws are separately positioned on the two ends of the bottom surface of described groove.Adopting said structure, outwards can there is resiliently deformable in claw, reduces the resistance installed in metallic pin process, is conveniently assembled in shell by metallic pin.
Preferred as one, described shell is provided with a described muscle.
Preferred as one, the width of described muscle is 0.3mm, and the outwardly height of described muscle is 0.25mm.
Preferred as one, described shell is made up of POM plastic.
Further, the outer wall of described metallic pin is provided with zinc coat.Zinc coat can prevent metallic pin corrosion.
In sum, the present invention has the following advantages relative to prior art:
1, noise is reduced: noise reduction pin of the present invention has certain flexible plastic casing owing to adding in metallic pin appearance, metal and plastic contacts is changed to by original metal and Metal Contact between noise reduction pin and pin-and-hole, fit system changes into interference fit by Spielpassung, greatly reduces the shock abnormal sound that the relative movement between two parts produces.
2, easy to assembly: noise reduction pin of the present invention owing to adding elastic card stator cleverly on shell, as long as therefore noise reduction pin loaded in pin-and-hole namely complete assembling, by elastic card stator, noise reduction pin is engaging in pin-and-hole, without the need to installing traditional resilient clip, this Standard is simple, improves efficiency of assembling.
Accompanying drawing explanation
Fig. 1 is one of scheme of installation of metal pins in background technique;
Fig. 2 is the scheme of installation two of metal pins in background technique;
Fig. 3 is the axonometric drawing of noise reduction pin of the present invention;
Fig. 4 is one of sectional view of noise reduction pin of the present invention;
Fig. 5 is the sectional view two of noise reduction pin of the present invention;
Fig. 6 is the structural representation of shell;
Fig. 7 is the structural representation of metallic pin;
Fig. 8 is one of scheme of installation of noise reduction pin of the present invention;
Fig. 9 is the scheme of installation two of noise reduction pin of the present invention.
In figure: 1-brake petal arm; 2-booster shift fork; 3-metal pins; 4-resilient clip; 5-noise reduction pin; 6-shell; 7-metallic pin; 8-shell fragment; 9-claw; 10-elastic card stator; 11-plunger; 12-pin neck; 13-muscle; 14-pin tail.
Embodiment
Below in conjunction with accompanying drawing, the invention will be further described.
A kind of noise reduction pin as shown in Figure 3, comprising:
Metallic pin 7 as shown in Figure 7, metallic pin 7 comprises the plunger 11, pin neck 12, pin body and the pin tail 14 that set gradually from top to bottom, the diameter of pin tail 14 is greater than the diameter of pin body, the diameter of pin body is greater than the diameter of pin neck 12, the diameter of plunger 11 bottom is greater than the diameter of pin neck 12 and is not more than the diameter of pin body, the top of plunger 11 is provided with the first guide portion that diameter reduces from bottom to up gradually, in the present embodiment, the first guide portion is tapered, metallic pin 7 is made up of Q235 steel, and is provided with zinc coat on the outer wall of metallic pin 7.
Shell 6 as shown in Figure 6, shell 6 is cylindrical circular working of plastics, and shell 6 can be made up of POM plastic.As shown in Figure 5, the cavity matched with metallic pin 7 is provided with in shell 6, the lower end of shell 6 is provided with the opening inserting cavity for metallic pin 7, the bottom of shell 6 is provided with the flange coordinated with the upper plane of pin tail 14, the edge of flange is provided with to downward-extension and is centered around the flange of pin tail 14 periphery, the middle part of cavity and pin body interference fit, the top of cavity is provided with the claw 9 coordinated with the lower end surface of plunger 11.
As shown in Figure 5 and Figure 6, the top of shell 6 is provided with the second guide portion that diameter reduces from bottom to up gradually, the second guide portion in the present embodiment is hemisphere, and the top of shell 6 is provided with the groove extended from top to bottom, groove and cavity connects and the top portion of shell 6 is slit into two shell fragments 8.Claw 9 is two, two claws 9 are separately positioned on the two ends of the bottom surface of groove, claw 9 is provided with the first plane for contacting with the lower end surface of plunger 11, and the second plane for contacting with the outer side wall of plunger 11, when metallic pin 7 inserts in shell 6, first guide portion extruding claw 9 outwards resiliently deformable, until plunger 11 is by claw 9 place, the bottom that claw 9 resilience is stuck in plunger 11 is carried out spacing to metallic pin 7.
As shown in Figure 4, shell 6 is provided with elastic card stator 10, the outer side wall of elastic card stator 10 is outwardly gradually from top to bottom, when the outer side wall of elastic card stator 10 is squeezed, there is resiliently deformable to the inside of shell 6 in elastic card stator 10, and can submerge in shell 6 completely in the bottom of elastic card stator 10; Concrete, shell 6 is provided with two elastic card stators 10, two elastic card stators 10 are oppositely arranged centered by the central axis of shell 6, shell 6 is provided with the opening portion corresponding with elastic card stator 10, the upper edge of elastic card stator 10 and the upper edge of opening portion are connected as a single entity, other edge of elastic card stator 10 and open part from, when the outer side wall of elastic card stator 10 is squeezed, there is resiliently deformable in the upper edge of elastic card stator 10, elastic card stator 10 submerges in shell 6 through opening portion.Neck 12 is corresponding with elastic card stator 10 arranges for pin, provides space, when elastic card stator 10 submerges in shell 6 through opening portion, because pin neck 12 diameter is less, can not stop elastic card stator 10 for elastic card stator 10 is out of shape to shell 6 inner elastomeric.
As shown in Figure 3, shell 6 is positioned on the outer side wall under elastic card stator 10 and is vertically provided with a muscle 13 outwardly, muscle 13 upwards extends from the flat of flange, the width of muscle 13 is 0.3mm, the outwardly height of muscle 13 is 0.25mm, and the length of muscle 13 is 15mm, when noise reduction pin 5 inserts in pin-and-hole, muscle 13 deforms, and makes interference fit between noise reduction pin 5 and pin-and-hole.
As shown in Figure 8 and Figure 9, above-mentioned noise reduction pin 5 is for connecting brake petal arm 1 and booster shift fork 2, brake petal arm 1 and booster shift fork 2 are equipped with pin-and-hole, booster shift fork 2 clamps brake petal arm 1, noise reduction pin 5 is through the pin-and-hole on brake petal arm 1 and booster shift fork 2, muscle 13 deforms in installation process, makes interference fit between noise reduction pin 5 and pin-and-hole; In assembly process, when elastic card stator 10 comes in contact with the inwall of the pin-and-hole on brake petal arm 1 and booster shift fork 2, resiliently deformable is there is in elastic card stator 10 in shell 6, when elastic card stator 10 passes through the pin-and-hole on brake petal arm 1 and booster shift fork 2, elastic card stator 10 outwards resilience, and send " click clatter " sound, represent that assembling completes.Now, flange on shell 6 is conflicted on the outer wall of booster shift fork 2 side, conflict on the outer wall of booster shift fork 2 opposite side in the bottom of elastic card stator 10, noise reduction pin 5 is fixed in the pin-and-hole on brake petal arm 1 and booster shift fork 2, adopt noise reduction pin 5 of the present invention, greatly reduce the relative movement between brake petal arm 1 and booster shift fork 2 and the shock abnormal sound produced, improve car load quality.Obviously, the parts that two needs that noise reduction pin 5 can also be used for connecting other are fixedly connected with, and the shock abnormal sound relative movement between two parts can avoided and produce.
For convenience of description, upper and lower in the present invention is all as the criterion with the system of coordinates in Fig. 3, but the actual disposition of noise reduction clamp involved in the present invention is not limited to above-mentioned direction.
Claims (10)
1. a noise reduction pin, is characterized in that: comprising:
Metallic pin (7), described metallic pin (7) comprises the plunger (11), pin neck (12), pin body and pin tail (14) that set gradually from top to bottom, the diameter of described pin tail (14) is greater than the diameter of described pin body, the diameter of described pin body is greater than the diameter of described pin neck (12), the diameter of described plunger (11) bottom is greater than the diameter of described pin neck (12) and is not more than the diameter of described pin body, and the top of described plunger (11) is provided with the first guide portion that diameter reduces from bottom to up gradually;
Shell (6), described shell (6) is cylindrical circular working of plastics, the cavity matched with described metallic pin (7) is provided with in described shell (6), the lower end of described shell (6) is provided with the opening inserting described cavity for described metallic pin (7), the bottom of described shell (6) is provided with the flange coordinated with the upper plane of described pin tail (14), the middle part of described cavity and described pin body interference fit, the top of described cavity is provided with the claw (9) coordinated with the lower end surface of described plunger (11), described shell (6) is provided with elastic card stator (10), the outer side wall of described elastic card stator (10) is outwardly gradually from top to bottom, when the outer side wall of described elastic card stator (10) is squeezed, resiliently deformable is there is in described elastic card stator (10) to the inside of described shell (6), and the bottom of described elastic card stator (10) can be submerged in described shell (6) completely,
Described pin neck (12) is corresponding with described elastic card stator (10) to be arranged, for described elastic card stator (10) provides space to the distortion of described shell (6) inner elastomeric;
Described shell (6) is positioned at the muscle (13) outer side wall under described elastic card stator (10) is vertically provided with outwardly.
2. noise reduction pin according to claim 1, it is characterized in that: described shell (6) is provided with the opening portion corresponding with described elastic card stator (10), the described upper edge of elastic card stator (10) and the upper edge of described opening portion are connected as a single entity, other edge of described elastic card stator (10) and described open part from.
3. noise reduction pin according to claim 1 and 2, is characterized in that: described shell (6) is provided with two described elastic card stators (10), and two described elastic card stators (10) are oppositely arranged centered by the central axis of described shell (6).
4. noise reduction pin according to claim 1, is characterized in that: described claw (9) is provided with the first plane for contacting with the lower end surface of described plunger (11), and the second plane for contacting with the outer side wall of described plunger (11).
5. the noise reduction pin according to claim 1 or 4, it is characterized in that: the top of described shell (6) is provided with the second guide portion that diameter reduces from bottom to up gradually, the top of described shell (6) is provided with the groove extended from top to bottom, described groove and described cavity connects and the top portion of described shell (6) is slit into two shell fragments (8).
6. noise reduction pin according to claim 5, is characterized in that: described claw (9) is two, and two described claws (9) are separately positioned on the two ends of the bottom surface of described groove.
7. noise reduction pin according to claim 1, is characterized in that: described shell (6) is provided with a described muscle (13).
8. the noise reduction pin according to claim 1 or 7, is characterized in that: the width of described muscle (13) is 0.3mm, and the outwardly height of described muscle (13) is 0.25mm.
9. noise reduction pin according to claim 1, is characterized in that: described shell (6) is made up of POM plastic.
10. noise reduction pin according to claim 1, is characterized in that: the outer wall of described metallic pin (7) is provided with zinc coat.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610000757.XA CN105570260B (en) | 2016-01-04 | 2016-01-04 | A kind of noise reduction pin |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610000757.XA CN105570260B (en) | 2016-01-04 | 2016-01-04 | A kind of noise reduction pin |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN105570260A true CN105570260A (en) | 2016-05-11 |
| CN105570260B CN105570260B (en) | 2018-03-02 |
Family
ID=55880755
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201610000757.XA Active CN105570260B (en) | 2016-01-04 | 2016-01-04 | A kind of noise reduction pin |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN105570260B (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110185687A (en) * | 2019-05-22 | 2019-08-30 | 安徽江淮汽车集团股份有限公司 | A kind of push-in pin shaft |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1526962A (en) * | 2003-03-03 | 2004-09-08 | 百乐仕株式会社 | Connecting element |
| CN101099046A (en) * | 2005-02-17 | 2008-01-02 | A.雷蒙合伙企业 | Fixing rivet |
| CN101315093A (en) * | 2007-05-30 | 2008-12-03 | 百乐仕株式会社 | Two-piece clip |
| US20110164946A1 (en) * | 2009-03-25 | 2011-07-07 | A. Raymond Et Cie | Expanding rivet |
| CN102767553A (en) * | 2012-08-01 | 2012-11-07 | 赛闻（天津）工业有限公司 | Integrated rivet |
| CN103370549A (en) * | 2010-12-14 | 2013-10-23 | 伊利诺斯工具制品有限公司 | Rivet fastener |
-
2016
- 2016-01-04 CN CN201610000757.XA patent/CN105570260B/en active Active
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1526962A (en) * | 2003-03-03 | 2004-09-08 | 百乐仕株式会社 | Connecting element |
| CN101099046A (en) * | 2005-02-17 | 2008-01-02 | A.雷蒙合伙企业 | Fixing rivet |
| CN101315093A (en) * | 2007-05-30 | 2008-12-03 | 百乐仕株式会社 | Two-piece clip |
| US20110164946A1 (en) * | 2009-03-25 | 2011-07-07 | A. Raymond Et Cie | Expanding rivet |
| CN103370549A (en) * | 2010-12-14 | 2013-10-23 | 伊利诺斯工具制品有限公司 | Rivet fastener |
| CN102767553A (en) * | 2012-08-01 | 2012-11-07 | 赛闻（天津）工业有限公司 | Integrated rivet |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110185687A (en) * | 2019-05-22 | 2019-08-30 | 安徽江淮汽车集团股份有限公司 | A kind of push-in pin shaft |
Also Published As
| Publication number | Publication date |
|---|---|
| CN105570260B (en) | 2018-03-02 |
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