CN105697590A - Double-brake-pad brake unit based on friction displacement - Google Patents
Double-brake-pad brake unit based on friction displacement Download PDFInfo
- Publication number
- CN105697590A CN105697590A CN201610181256.6A CN201610181256A CN105697590A CN 105697590 A CN105697590 A CN 105697590A CN 201610181256 A CN201610181256 A CN 201610181256A CN 105697590 A CN105697590 A CN 105697590A
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- China
- Prior art keywords
- brake
- fan
- groove
- spring
- loop bar
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- 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
- 238000006073 displacement reaction Methods 0.000 title claims abstract description 10
- 230000009977 dual effect Effects 0.000 claims description 8
- 238000005299 abrasion Methods 0.000 description 5
- 238000009434 installation Methods 0.000 description 5
- 230000006835 compression Effects 0.000 description 4
- 238000007906 compression Methods 0.000 description 4
- 238000005516 engineering process Methods 0.000 description 4
- 230000001413 cellular effect Effects 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 238000000034 method Methods 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
- F16D—COUPLINGS FOR TRANSMITTING ROTATION; CLUTCHES; BRAKES
- F16D55/00—Brakes with substantially-radial braking surfaces pressed together in axial direction, e.g. disc brakes
- F16D55/02—Brakes with substantially-radial braking surfaces pressed together in axial direction, e.g. disc brakes with axially-movable discs or pads pressed against axially-located rotating members
- F16D55/22—Brakes with substantially-radial braking surfaces pressed together in axial direction, e.g. disc brakes with axially-movable discs or pads pressed against axially-located rotating members by clamping an axially-located rotating disc between movable braking members, e.g. movable brake discs or brake pads
Abstract
The invention belongs to the technical field of automobile braking, and particularly relates to a double-brake-pad brake unit based on friction displacement. The double-brake-pad brake unit comprises a brake disc, a first brake unit, a second brake unit, a rotating shaft and fan-shaped brake supports. The first brake unit and the second brake unit are connected through a brake unit connection shell and located on the two sides of the brake disc, and control hydraulic columns installed on a brake unit hydraulic shell to be stretched out and drawn back through hydraulic pressure. Guide rail grooves are formed in power plates. Trapezoid guide rails are installed on the fan-shaped brake support. The fan-shaped brake supports can slide and move on the power plates under the cooperation of the guide rails and the guide rail grooves. Springs are installed on the trapezoid guide rails. The partial structures, higher than spring grooves, of the springs interfere with the power plates. When the fan-shaped supports and the power plates slide relative to each other, the springs can be compressed; brake pads making contact with the brake disc change when the fan-shaped brake supports move, and therefore the brake pads used for slight braking and strong braking are different; and the effect of improving the braking safety of a whole automobile is achieved.
Description
Art
The invention belongs to automobile brake technical field, particularly relate to a kind of dual brake sheet brake units based on frictional displacement。
Background technology
Current automobile brake major part uses hydraulic drive brake block to produce pressure with brake disc, by frictional force, brake disc is braked。In braking procedure, disc surface all contacts with brake disc surface, when brake block because certain once brakes occurs in that brake block heating is worn and torn rapidly, and the time abrasion that the service life of brake block is then, namely need to change immediately, otherwise influence whether traffic safety。Additionally for brake block, brake block that performance is high and the low brake block price difference of performance are relatively big, and often everybody buys the brake block of medium-performance, both ensure that quality also meets price holding capacity。But medium brake block is not so good as a kind of contradiction of the measured brake block of matter, safety and Price Impact in strong performance in a flash after all。
The present invention designs a kind of dual brake sheet brake units based on frictional displacement and solves as above problem。
Summary of the invention
For solving drawbacks described above of the prior art, a kind of dual brake sheet brake units based on frictional displacement of disclosure, it realizes by the following technical solutions。
A kind of dual brake sheet brake units based on frictional displacement, it is characterized in that: it includes brake disc, first brake unit, the second brake units, rotating shaft, wherein brake disc is arranged on rotating shaft one end, first brake unit and the second brake units structure are identical and be symmetrically mounted on automobile chassis, and first brake unit and the second brake units are positioned at brake disc both sides。
Above-mentioned first brake unit includes fan-shaped brake support, power plate, hydraulic column, brake units connect shell, brake units hydraulic case, guide-track groove, loop bar groove, spring groove, loop bar, ladder type guide rail, and wherein brake units connects shell and is arranged on brake units hydraulic case and both internal cavities communicate；First brake unit and the second brake units connect shell by respective brake units and are connected with each other, and in junction, inner chamber communicates；Two hydraulic columns are arranged on brake units hydraulic case side by side, and two hydraulic column one end are positioned at the internal other end of brake units hydraulic case outside brake units hydraulic case；Power plate is arranged on two hydraulic columns；Power plate has guide-track groove, in the middle of guide-track groove, has loop bar groove；Being provided with ladder type guide rail on fan-shaped brake support, ladder type guide rail and guide-track groove are slidably matched, and ladder type guide rail has spring groove in the middle of side, and loop bar is arranged in spring groove；Spring is nested in outside loop bar, and spring and a loop bar part are respectively positioned in spring groove, and another part all exceeds spring groove；Exceed the loop bar part of spring groove to be slidably matched with loop bar groove, exceed the height of the spring section of spring groove and exceed loop bar groove and exceed the spring section of spring groove and interfere with power plate；Circumferential lengths is power plate circumferential lengths 2.5 times of fan-shaped brake support。
As the further improvement of this technology, on above-mentioned brake disc, circumference uniformly has wheel fixing hole。
As the further improvement of this technology, above-mentioned fan-shaped brake support is provided with first brake sheet and the second brake block。The material of first brake sheet and the second brake block can be different。
Relative to traditional automobile brake technology, in the present invention, first brake unit and the second brake units connect shell by brake units and connect, and are located at brake disc both sides, the hydraulic column being arranged on brake units hydraulic case by hydraulic control flexible。Power plate has guide-track groove, fan-shaped brake support is provided with ladder type guide rail, fan-shaped brake support can pass through guide rail and move with the slip on power plate that coordinates of guide-track groove, ladder type guide rail has spring groove, spring groove is provided with loop bar, loop bar is provided with spring, when fan-shaped brake support slides on power plate, spring exceeds the part-structure of spring groove and interferes with power plate, and spring will be compressed along loop bar；When brake starts, brake block does not also encounter brake disc, and fan-shaped brake support keeps the side of fan-shaped brake support to be substantially flush with power plate side under spring action；When the brake block on fan-shaped brake support contact with brake disc, fan-shaped brake support the frictional force of brake disc, spring compression resistance force under relative motion between generation and power plate, the while of moving, brake disc can be played certain braking action by brake block；Along with hydraulic column continues elongation, the pressure of brake disc is continued to increase by brake block, frictional force between brake block and brake disc increases, fan-shaped brake support slides on power plate so that spring continues compression, stop motion after spring force is identical with frictional force, after brake terminates, fan-shaped brake support under the action of the spring, recovers original state。It addition, along with braking strength strengthens, the brake block contacted with brake disc is as fan-shaped brake support motion and changes, so it is different for gently stopping from brake block used of stopping by force；When the custom that driver drives is relatively good, drive often gently to brake, the simply first brake sheet that brake block is often worn, second brake block abrasion is less, when the time that brake block uses is longer, the brake block used of gently stopping occurs malfunctioning because of abrasion, at this moment stops by force and is also able to ensure traffic safety, because brake block is part wears。At this moment the inefficacy gently stopped of braking mechanism changes the prompting of brake block can to driver one, but now the brake block used of stopping by force of braking mechanism has not expired。Present invention utilizes the brake block gently stopped and wear and tear in a flash by force different so that people can, when gently stopping inefficacy, can either have recognized the need to change brake block, can utilize again continuation safety traffic of stopping by force。Additionally brake block is when mounted, work surface at light brake block in a flash can install slightly time any brake block, and strong brake block in a flash work surface can the higher brake block of installation quality, namely do so improves the safety of car load braking, ensure that economy simultaneously。
Accompanying drawing explanation
Fig. 1 is braking mechanism scheme of installation。
Fig. 2 is braking mechanism side view。
Fig. 3 is first brake cellular construction schematic diagram。
Fig. 4 is power plate structural representation。
Fig. 5 is that power plate installs top view。
Fig. 6 is ladder type guide rail, loop bar scheme of installation。
Fig. 7 is fan-shaped brake support scheme of installation。
Number in the figure title: 1, wheel fixing hole, 2, brake disc, 3, first brake unit, 4, the second brake units, 5, rotating shaft, 6, fan-shaped brake support, 7, power plate, 8, hydraulic column, 9, first brake sheet, 10, brake units connects shell, and 11, brake units hydraulic case, the 12, second brake block, 13, guide-track groove, 14, loop bar groove, 15, spring groove, 16, loop bar, 17, ladder type guide rail。
Detailed description of the invention
As shown in Figure 1, 2, it includes brake disc 2, first brake unit the 3, second brake units 4, rotating shaft 5, wherein brake disc 2 is arranged on rotating shaft 5 one end, first brake unit 3 is identical with the second brake units 4 structure and is symmetrically mounted on automobile chassis, and first brake unit 3 and the second brake units 4 are positioned at brake disc 2 both sides。
As shown in Figure 3, above-mentioned first brake unit 3 includes fan-shaped brake support 6, power plate 7, hydraulic column 8, brake units connection shell 10, brake units hydraulic case 11, guide-track groove 13, loop bar groove 14, spring groove 15, loop bar 16, ladder type guide rail 17, wherein as it is shown in figure 1, brake units connection shell 10 is arranged on brake units hydraulic case 11 and both internal cavities communicate；First brake unit 3 is connected shell 10 with the second brake units 4 by respective brake units and is connected with each other, and in junction, inner chamber communicates；Two hydraulic columns 8 are arranged on brake units hydraulic case 11 side by side, and two hydraulic column 8 one end are positioned at the internal other end of brake units hydraulic case 11 outside brake units hydraulic case 11；As shown in Figure 4,5, power plate 7 is arranged on two hydraulic columns 8；Power plate 7 has guide-track groove 13, in the middle of guide-track groove 13, has loop bar groove 14；As shown in Figure 6, fan-shaped brake support 6 being provided with ladder type guide rail 17, ladder type guide rail 17 and guide-track groove 13 are slidably matched, and have spring groove 15 in the middle of ladder type guide rail 17 side, and loop bar 16 is arranged in spring groove 15；Spring is nested in outside loop bar 16, and spring and loop bar 16 part are respectively positioned in spring groove 15, and another part all exceeds spring groove 15；It is slidably matched with loop bar groove 14 as it is shown in fig. 7, exceed loop bar 16 part of spring groove 15, exceeds the height of the spring section of spring groove 15 and exceed loop bar groove 14 and exceed the spring section of spring groove 15 and interfere with power plate 7；2.5 times that circumferential lengths is power plate 7 circumferential lengths of fan-shaped brake support 6。
As it is shown in figure 1, circumference uniformly has wheel fixing hole 1 on above-mentioned brake disc 2。
Above-mentioned fan-shaped brake support 6 is provided with first brake sheet 9 and the second brake block 12。
In sum, in the present invention, first brake unit 3 is connected shell 10 with the second brake units 4 by brake units and connects, and is located at brake disc 2 both sides, the hydraulic column 8 being arranged on brake units hydraulic case 11 by hydraulic control flexible。As shown in Figure 4, power plate 7 has guide-track groove 13, fan-shaped brake support 6 is provided with ladder type guide rail 17, fan-shaped brake support 6 can pass through guide rail and move with the slip on power plate 7 that coordinates of guide-track groove 13, ladder type guide rail 17 has spring groove 15, spring groove 15 is provided with loop bar 16, loop bar 16 is provided with spring, as shown in Figure 7, when fan-shaped brake support 6 slides on power plate 7, spring exceeds the part-structure of spring groove 15 and interferes with power plate 7, and spring will be compressed along loop bar 16；When brake starts, brake block does not also encounter brake disc 2, and fan-shaped brake support 6 keeps the side of fan-shaped brake support 6 to be substantially flush with power plate 7 side under spring action；When the brake block on fan-shaped brake support 6 contacts with brake disc 2, fan-shaped brake support 6 the frictional force of brake disc 2, spring compression resistance force under there is the relative motion between power plate 7, move brake block simultaneously and brake disc 2 can be played certain braking action；Along with hydraulic column 8 continues elongation, the pressure of brake disc 2 is continued to increase by brake block, frictional force between brake block and brake disc 2 increases, fan-shaped brake support 6 slides on power plate 7 so that spring continues compression, stop motion after spring force is identical with frictional force, after brake terminates, fan-shaped brake support 6 under the action of the spring, recovers original state。It addition, along with braking strength strengthens, the brake block contacted with brake disc 2 is as fan-shaped brake support 6 and moves and change, so it is different for gently stopping from brake block used of stopping by force；When the custom that driver drives is relatively good, drive often gently to brake, the simply first brake sheet 9 that brake block is often worn, second brake block 12 abrasion is less, when the time that brake block uses is longer, the brake block used of gently stopping occurs malfunctioning because of abrasion, at this moment stops by force and is also able to ensure traffic safety, because brake block is part wears。At this moment the inefficacy gently stopped of braking mechanism changes the prompting of brake block can to driver one, but now the brake block used of stopping by force of braking mechanism has not expired。Present invention utilizes the brake block gently stopped and wear and tear in a flash by force different so that people can, when gently stopping inefficacy, can either have recognized the need to change brake block, can utilize again continuation safety traffic of stopping by force。Additionally brake block is when mounted, work surface at light brake block in a flash can install slightly time any brake block, and strong brake block in a flash work surface can the higher brake block of installation quality, namely do so improves the safety of car load braking, ensure that economy simultaneously。
Claims (3)
1. the dual brake sheet brake units based on frictional displacement, it is characterized in that: it includes brake disc, first brake unit, the second brake units, rotating shaft, wherein brake disc is arranged on rotating shaft one end, first brake unit and the second brake units structure are identical and be symmetrically mounted on automobile chassis, and first brake unit and the second brake units are positioned at brake disc both sides；
Above-mentioned first brake unit includes fan-shaped brake support, power plate, hydraulic column, brake units connect shell, brake units hydraulic case, guide-track groove, loop bar groove, spring groove, loop bar, ladder type guide rail, and wherein brake units connects shell and is arranged on brake units hydraulic case and both internal cavities communicate；First brake unit and the second brake units connect shell by respective brake units and are connected with each other, and in junction, inner chamber communicates；Two hydraulic columns are arranged on brake units hydraulic case side by side, and two hydraulic column one end are positioned at the internal other end of brake units hydraulic case outside brake units hydraulic case；Power plate is arranged on two hydraulic columns；Power plate has guide-track groove, in the middle of guide-track groove, has loop bar groove；Being provided with ladder type guide rail on fan-shaped brake support, ladder type guide rail and guide-track groove are slidably matched, and ladder type guide rail has spring groove in the middle of side, and loop bar is arranged in spring groove；Spring is nested in outside loop bar, and spring and a loop bar part are respectively positioned in spring groove, and another part all exceeds spring groove；Exceed the loop bar part of spring groove to be slidably matched with loop bar groove, exceed the height of the spring section of spring groove and exceed loop bar groove and exceed the spring section of spring groove and interfere with power plate；Circumferential lengths is power plate circumferential lengths 2.5 times of fan-shaped brake support。
2. a kind of dual brake sheet brake units based on frictional displacement according to claim 1, it is characterised in that: on above-mentioned brake disc, circumference uniformly has wheel fixing hole。
3. a kind of dual brake sheet brake units based on frictional displacement according to claim 1, it is characterised in that: above-mentioned fan-shaped brake support is provided with first brake sheet and the second brake block。
Priority Applications (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610181256.6A CN105697590B (en) | 2016-03-28 | 2016-03-28 | A kind of dual brake piece brake units based on frictional displacement |
| CN201711383138.4A CN108087454B (en) | 2016-03-28 | 2016-03-28 | A kind of brake units based on frictional displacement |
| CN201711382526.0A CN108087453B (en) | 2016-03-28 | 2016-03-28 | A kind of dual brake piece brake units of frictional displacement |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610181256.6A CN105697590B (en) | 2016-03-28 | 2016-03-28 | A kind of dual brake piece brake units based on frictional displacement |
Related Child Applications (2)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201711383138.4A Division CN108087454B (en) | 2016-03-28 | 2016-03-28 | A kind of brake units based on frictional displacement |
| CN201711382526.0A Division CN108087453B (en) | 2016-03-28 | 2016-03-28 | A kind of dual brake piece brake units of frictional displacement |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN105697590A true CN105697590A (en) | 2016-06-22 |
| CN105697590B CN105697590B (en) | 2018-04-03 |
Family
ID=56233013
Family Applications (3)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201610181256.6A Expired - Fee Related CN105697590B (en) | 2016-03-28 | 2016-03-28 | A kind of dual brake piece brake units based on frictional displacement |
| CN201711382526.0A Active CN108087453B (en) | 2016-03-28 | 2016-03-28 | A kind of dual brake piece brake units of frictional displacement |
| CN201711383138.4A Active CN108087454B (en) | 2016-03-28 | 2016-03-28 | A kind of brake units based on frictional displacement |
Family Applications After (2)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201711382526.0A Active CN108087453B (en) | 2016-03-28 | 2016-03-28 | A kind of dual brake piece brake units of frictional displacement |
| CN201711383138.4A Active CN108087454B (en) | 2016-03-28 | 2016-03-28 | A kind of brake units based on frictional displacement |
Country Status (1)
| Country | Link |
|---|---|
| CN (3) | CN105697590B (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107420463A (en) * | 2017-04-26 | 2017-12-01 | 奉化市东成摩擦材料有限公司 | A kind of brake apparatus with double-brake piece |
| CN108518431A (en) * | 2018-04-17 | 2018-09-11 | 东莞市智配机电科技有限公司 | A kind of braking mechanism of adjustable unilateral driving |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105697590B (en) * | 2016-03-28 | 2018-04-03 | 王敏晓 | A kind of dual brake piece brake units based on frictional displacement |
| CN108730372B (en) * | 2018-06-04 | 2020-10-09 | 海门茂发美术图案设计有限公司 | Symmetric reducing brake system |
| EP4025801B1 (en) * | 2019-09-02 | 2024-01-03 | Volvo Truck Corporation | A brake pad retainer arrangement |
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| CN1576635A (en) * | 2003-07-29 | 2005-02-09 | 住友电工刹车系统株式会社 | Brake tongs device |
| US20050199452A1 (en) * | 2003-12-18 | 2005-09-15 | Ward Andrew J. | Disc sliding mechanism |
| JP2012117657A (en) * | 2010-12-03 | 2012-06-21 | Akebono Brake Ind Co Ltd | Disk brake device |
| CN103912610A (en) * | 2014-03-28 | 2014-07-09 | 南车戚墅堰机车车辆工艺研究所有限公司 | Hydraulically driven service brake |
| CN105240424A (en) * | 2015-11-23 | 2016-01-13 | 吴泽忠 | Emergent brake device for vehicle |
| CN205479017U (en) * | 2016-03-28 | 2016-08-17 | 杭州启澄科技有限公司 | Dual -brake piece brake unit based on friction is shifted |
Family Cites Families (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB1033158A (en) * | 1961-11-04 | 1966-06-15 | Girling Ltd | Improvements relating to disc brakes |
| JP2000104764A (en) * | 1998-09-28 | 2000-04-11 | Nissin Kogyo Co Ltd | Disc brake for vehicle |
| CN101162031A (en) * | 2006-10-10 | 2008-04-16 | 崔晓光 | Automobile brake reducer |
| CN202392009U (en) * | 2011-10-18 | 2012-08-22 | 广西柳工机械股份有限公司 | Caliper disc brake |
| CN105697590B (en) * | 2016-03-28 | 2018-04-03 | 王敏晓 | A kind of dual brake piece brake units based on frictional displacement |
-
2016
- 2016-03-28 CN CN201610181256.6A patent/CN105697590B/en not_active Expired - Fee Related
- 2016-03-28 CN CN201711382526.0A patent/CN108087453B/en active Active
- 2016-03-28 CN CN201711383138.4A patent/CN108087454B/en active Active
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1576635A (en) * | 2003-07-29 | 2005-02-09 | 住友电工刹车系统株式会社 | Brake tongs device |
| US20050199452A1 (en) * | 2003-12-18 | 2005-09-15 | Ward Andrew J. | Disc sliding mechanism |
| JP2012117657A (en) * | 2010-12-03 | 2012-06-21 | Akebono Brake Ind Co Ltd | Disk brake device |
| CN103912610A (en) * | 2014-03-28 | 2014-07-09 | 南车戚墅堰机车车辆工艺研究所有限公司 | Hydraulically driven service brake |
| CN105240424A (en) * | 2015-11-23 | 2016-01-13 | 吴泽忠 | Emergent brake device for vehicle |
| CN205479017U (en) * | 2016-03-28 | 2016-08-17 | 杭州启澄科技有限公司 | Dual -brake piece brake unit based on friction is shifted |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107420463A (en) * | 2017-04-26 | 2017-12-01 | 奉化市东成摩擦材料有限公司 | A kind of brake apparatus with double-brake piece |
| CN108518431A (en) * | 2018-04-17 | 2018-09-11 | 东莞市智配机电科技有限公司 | A kind of braking mechanism of adjustable unilateral driving |
Also Published As
| Publication number | Publication date |
|---|---|
| CN108087454A (en) | 2018-05-29 |
| CN108087454B (en) | 2018-12-07 |
| CN108087453A (en) | 2018-05-29 |
| CN105697590B (en) | 2018-04-03 |
| CN108087453B (en) | 2018-12-18 |
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Effective date of registration: 20180302 Address after: Longwan Yongzhong Street Metro Xian real District of Wenzhou City, Zhejiang Province, No. 11 Lane 325024 Applicant after: Wang Minxiao Address before: Ma Shi Jie, Shangcheng District in Hangzhou city Zhejiang province 310012 155 unit 2, Room 401 Applicant before: HANGZHOU QICHENG SCIENCE & TECHNOLOGY Co.,Ltd. |
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Effective date of registration: 20211123 Address after: Room 503, building 3, No. 133, development avenue, Tongxiang Economic Development Zone, Tongxiang City, Jiaxing City, Zhejiang Province Patentee after: ZHEJIANG MAIZHI NETWORK TECHNOLOGY CO.,LTD. Address before: 325024 No. 11, Xian Fang lane, New Town Street, Longwan District, Wenzhou, Zhejiang Patentee before: Wang Minxiao |
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Effective date of registration: 20221219 Address after: 314500 Room 635-708, Fengrun International Business Center, Zhenxing East Road, wutong Street, Tongxiang City, Jiaxing City, Zhejiang Province Patentee after: JIAXING LONGLIE ELECTRONIC COMMERCE Co.,Ltd. Address before: Room 503, building 3, No. 133, development avenue, Tongxiang Economic Development Zone, Tongxiang City, Jiaxing City, Zhejiang Province Patentee before: ZHEJIANG MAIZHI NETWORK TECHNOLOGY CO.,LTD. |
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Granted publication date: 20180403 |