CN207712235U - A kind of moped drive system and moped - Google Patents
A kind of moped drive system and moped Download PDFInfo
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- CN207712235U CN207712235U CN201721906447.0U CN201721906447U CN207712235U CN 207712235 U CN207712235 U CN 207712235U CN 201721906447 U CN201721906447 U CN 201721906447U CN 207712235 U CN207712235 U CN 207712235U
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- crank
- transmission device
- transmission shaft
- moped
- fixedly connected
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- 238000010586 diagram Methods 0.000 description 25
- 230000000694 effects Effects 0.000 description 2
- 230000007613 environmental effect Effects 0.000 description 2
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Abstract
The utility model is related to a kind of moped drive system and moped, including crank and be set with successively from inside to outside crank axle, transmission shaft, fixing axle；Described transmission shaft one end is fixedly connected with driven chain fluted disc；The both ends of crank axle are respectively fixedly connected with the crank described in two, and one end connection pedal, the other end of crank are connected with lever transmission device, wherein a lever transmission device is fixedly connected with transmission shaft, another lever transmission device is fixedly connected with driven chain fluted disc.The utility model moped drive system improves the drive form of standard bicycle, crank, in 45 degree of inclination labour-saving angles, drives the outer circle of chain tooth wheel disc to rotate with the principle of lever with the outer circle impetus of driving gear disc and active ring gear by lever transmission device.Compared to ordinary bicycle crank using gear disk center as power point, then with the chain rotation in central point drive toothed disc outer circle, many outer active forces can be saved.
Description
Technical field
The utility model is related to a kind of moped drive system and mopeds, belong to technical field of bicycles.
Background technology
It is accommodating as going out, energy conservation and environmental protection and cheap bicycle, although having obtained in people's lives extensively
Application, but people's bipod is needed to exert oneself treadled cycle pedal in use, bicycle could move forward.Once
Distance is remote or encounters gradient section and will be short of physical strength, for crowd especially poor to the elderly or constitution, Jiu Huigeng
Adding seems and is short of physical strength, and is more widely applied to limit bicycle.
Traditional bicycle drive train system is that crank, bent axle are directly fixed together with chain pitch wheel disk center point,
Needing people to exert oneself when riding, treadled cycle is foot-operated makes crank rotation, and bent axle is again using the central point of toothed disc as power point, band
Chain rotation in moving teeth wheel disc outer circle, can transfer power to trailing wheel and bicycle is driven to move ahead.This traditional driving system
Although system is simple in structure, very laborious when riding, especially when bicycle running gentle slope section.People are needed more to exert oneself
Ground treadled cycle is foot-operated, and active force just can drive the drive of the chain in toothed disc outer circle to sail certainly from the power point of gear disk center
Driving moves ahead, or the walking that walks one's bicycle of having to, and thus consumes the more active forces of people.Therefore, in order to make people
Go out it is accommodating, laborsaving, my utility model devise it is a kind of neither increasing bicycle cost, need not also increase any additional machine
Tool power, very labour-saving bicycle solves the above problems again when riding, and bicycle is enable more to be widely applied, and improves people
Trip, solve congestion and the environmental issue in city.
Utility model content
In view of the deficiencies of the prior art, the utility model provides a kind of moped drive system, which adopts
It is more convenient, laborsaving when making the cycling of the assembly drive system with completely new structure design, it rides more efficient
Effect.
The technical solution of the utility model is as follows：
A kind of moped drive system, including crank and the crank axle, transmission shaft, solid that is set with successively from inside to outside
Dead axle；Described transmission shaft one end is fixedly connected with driven chain fluted disc；The both ends of crank axle are respectively fixedly connected with described in two
Crank, one end connection pedal, the other end of crank are connected with lever transmission device, wherein a lever transmission device is fixed with transmission shaft
Connection, another lever transmission device are fixedly connected with driven chain fluted disc.
A kind of moped drive system, including crank and the crank axle, transmission shaft, solid that is set with successively from inside to outside
Dead axle；Described transmission shaft one end is fixedly connected with driving gear disc, the other end is fixedly connected with driven chain fluted disc, driven chain tooth
The outer circle of disk is also associated with active ring gear；The both ends of crank axle are respectively fixedly connected with the crank described in two, and one end of crank connects
Pin is pedaled, the other end is connected with lever transmission device, wherein a lever transmission device passes through ratchet driver and pawl driving active
Fluted disc outer circle rotates, and another lever transmission device drives active ring gear outer circle to rotate by ratchet driver and pawl.
Preferably, it is nested with rolling bearing respectively between the crank axle and transmission shaft, between transmission shaft and fixing axle；Gu
Dead axle outer diameter is 36-48mm, internal diameter 28-40mm, length 40-64mm；Transmission shaft outer diameter is 26-30mm, internal diameter 18-
22mm, length 82-101mm；The a diameter of 8-12mm of crank axle, length 110-146mm.
Preferably, the crank is fixed together with crank axle by fixed screw.
Preferably, the external form of the lever transmission device is semicircle, round or arc；Arc radius is 36-93mm, rotates
Radius is 39-135mm；Semicircle radius is 46-93mm, radius of turn 39-136mm；Circular radius is 45-136mm.
Preferably, wherein one end of lever transmission device and the lengthening end of crank pass through fixed screw connection, the other end
It is inserted in one end of transmission shaft and by fixed screw and transmission axis connection；The lengthening of one end and crank of another lever transmission device
End is fixedly connected by fixed screw with the outer circle of driven chain fluted disc by fixed screw connection, the other end；Driven chain tooth
A diameter of 120-188mm of disk.
Preferably, wherein one end of lever transmission device and the lengthening end of crank in 45 ° of slanted angles and pass through fixation
Screw connection, the other end drive the rotation of driving gear disc outer circle by ratchet driver and pawl；The one of another lever transmission device
End is connect with the lengthening end of crank in 45 ° of slanted angles and by fixed screw, the other end is driven by ratchet driver and pawl
Dynamic active ring gear outer circle rotation；A diameter of 116-209mm of driving gear disc, the outer diameter of active ring gear is 116-209mm, internal diameter is
96-132mm。
A kind of moped, including above-mentioned moped drive system.
The beneficial effects of the utility model are：
The utility model moped drive system improves the drive form of standard bicycle, crank and driving gear disc
Outer circle impetus with active ring gear drives chain with the principle of lever in 45 degree of inclination labour-saving angles by lever transmission device
The outer circle of toothed disc rotates.Compared to ordinary bicycle crank using gear disk center as power point, then with central point drive toothed disc
Chain rotation in outer circle, can save many outer active forces.It is lighter when to make bicyclist ride, more effortless, more longlasting, make
It is easier to be accepted use using the moped of the utility model drive system.The trip for increasing bicycle uses machine
Rate keeps the trip of people lighter, quick, laborsaving.
Description of the drawings
Fig. 1 is the structural schematic diagram of the utility model drive system；
Fig. 2 a are the planar structure schematic diagram of driving gear disc in the utility model；
Fig. 2 b are the side structure schematic diagram of driving gear disc in the utility model；
Fig. 3 a are the planar structure schematic diagram of active ring gear in the utility model；
Fig. 3 b are the side structure schematic diagram of active ring gear in the utility model；
Fig. 4 a are the planar structure schematic diagram of driven chain fluted disc in the utility model；
Fig. 4 b are the side structure schematic diagram of driven chain fluted disc in the utility model；
Fig. 5 a are the planar structure schematic diagram of semicircle lever transmission device in the utility model；
Fig. 5 b are the side structure schematic diagram of semicircle lever transmission device in the utility model；
Fig. 6 a are the planar structure schematic diagram of crank in the utility model；
Fig. 6 b are the side structure schematic diagram of crank in the utility model；
Fig. 7 a are the structure sectional view of fixing axle in the utility model；
Fig. 7 b are the end section structural schematic diagram of fixing axle in the utility model；
Fig. 8 is the structure sectional view of transmission shaft in the utility model；
Fig. 9 is the structure sectional view of crank axle in the utility model；
Figure 10 is the work of crank in the utility model, semicircle lever transmission device, ratchet driver, ratchet and driving gear disc
Make attachment structure schematic diagram；
Figure 11 is the work of crank in the utility model, semicircle lever transmission device, ratchet driver, ratchet and active ring gear
Make attachment structure schematic diagram；
Figure 12 a are the work attachment structure schematic diagram of crank and arc lever transmission device in the utility model；
Figure 12 b are the work attachment structure schematic diagram of arc lever transmission device, transmission shaft and crank axle in the utility model；
Figure 13 a are the work attachment structure schematic diagram of crank and round lever transmission device in the utility model；
Figure 13 b are the work attachment structure schematic diagram of round lever transmission device, transmission shaft and crank axle in the utility model；
Figure 14 a be crank in the utility model, semicircle lever transmission device and chain tooth wheel disc work connection structure show
It is intended to；
Figure 14 b are the work of crank in the utility model, semicircle lever transmission device, toothed disc, transmission shaft and crank axle
Attachment structure schematic diagram；
Figure 15 a are the work attachment structure schematic diagram of crank in the utility model, round lever transmission device and toothed disc；
Figure 15 b are that the work of crank in the utility model, round lever transmission device, toothed disc, transmission shaft and crank axle connects
Connect structural schematic diagram；
Figure 16 a are the attachment structure schematic diagram of crank and the short arc lever transmission device of radius of turn in the utility model；
Figure 16 b are the attachment structure schematic diagram of the short arc lever transmission device of radius of turn, transmission shaft and crank axle；
Figure 17 a are the attachment structure schematic diagram of crank and the short round lever transmission device of radius of turn in the utility model；
The connection structure of the short round lever transmission device of radius of turn, transmission shaft and crank axle in Figure 17 b the utility model
Schematic diagram；
Wherein：1, left crank；2, lever transmission device；3, fixed screw；4, driving gear disc；5, fixing axle；6, transmission shaft；
7, crank axle；8, bearing；9, bearing；10, fixed screw；11, right crank；12, active ring gear；13, fixed screw；14, from
Dynamic chain fluted disc；15, fixed screw；16, fixed screw；17, fixed screw；18, fixed screw；19, ratchet driver；20、
Pedal mounting hole；21, spring；22, pawl；23, round lever transmission device；24, fixed screw.
Specific implementation mode
The utility model is described further by way of example and in conjunction with the accompanying drawings, but not limited to this.
Embodiment 1：
As shown in Figure 1, the present embodiment provides a kind of moped drive system, including crank and from inside to outside successively
The crank axle 7 of suit, transmission shaft 6, fixing axle 5；6 one end of transmission shaft is fixedly connected with driving gear disc 4, the other end is fixedly connected with
The outer circle of driven chain fluted disc 14, driven chain fluted disc 14 is also associated with active ring gear 12；The both ends of crank axle 7 are fixed respectively to be connected
The crank described in two is connect, one end connection pedal, the other end of crank are connected with lever transmission device, wherein a lever transmission device
One end the rotation of driving gear disc outer circle is driven by ratchet driver and pawl, one end of another lever transmission device passes through ratchet
Driver and pawl driving active ring gear outer circle rotation.
Specifically, as shown in figure 9, the both ends of crank axle 7 pass through two cranks of installation of fixed screw 10, i.e. left side respectively
It is all provided with pedal mounting hole 20 on crank 1 and right crank 11, left crank 1 and right crank 11, is easily installed pedal.Crank
Between axis 7 and transmission shaft 6, it is nested with rolling bearing 8,9 between transmission shaft 6 and fixing axle 5 respectively at end positions.Fixing axle
It is fixedly connected with cycle frame among 5 outer diameter.
As shown in Figure 2 a and 2 b, driving gear disc 4 is round ratchet fluted disc, and center is provided with hole, is sleeved on 6 one end of transmission shaft
And it is fixed together by fixed screw 17.The excircle of driving gear disc 4 is equipped with ratchet, and (only signal depicts office in figure
Portion's ratchet), 2 one end of lever transmission device in left side is fixed together by the extended end of fixed screw 16 and left crank,
The other end connects ratchet driver by fixed screw 3, and ratchet driver is connected with driving gear disc and is blocked by pawl
Ratchet on 4 excircle of driving gear disc.
The chain of driving vehicle wheel rotation is hung on driven 14 excircle of chain fluted disc, driven chain fluted disc 14 is round fluted disc,
Center is provided with hole, is sleeved on 6 other end of transmission shaft and is fixed together by fixed screw 15, driven chain fluted disc 14
Outer circumferential edge connects active ring gear 12 by fixed screw 13, and 2 one end of lever transmission device on right side passes through fixed screw 16 and right side
The extended end of crank 11 is fixed together, the other end connects ratchet driver 19, ratchet driver by fixed screw 18
19 are connected with active ring gear 12 and block the ratchet on 12 excircle of active ring gear by pawl.
The external form of lever transmission device can be any one of semicircle, round or arc in the present embodiment.Left crank
Length with right crank is 180-234mm, and crank is 20-44mm with the partial-length that crank axle connecting pin lengthens；Driving tooth
The a diameter of 116-209mm of outer diameter of ring, internal diameter a diameter of 96-132mm, a diameter of 120-188mm of driven chain fluted disc, actively
A diameter of 116-209mm of fluted disc；The a diameter of 48mm of fixing axle outer diameter, internal diameter a diameter of 40mm, length 64mm；Outside transmission shaft
The a diameter of 30mm of diameter, internal diameter a diameter of 22mm, length 101mm, crank axle a diameter of 12mm, length 146mm.
Embodiment 2：
The present embodiment provides a kind of moped drive systems, and structure is as described in Example 1, the difference is that：
One end of the lever transmission device 2 in left side is in 45 ° of slanted angles with the lengthening end of crank 1 and is connect by fixed screw, the other end
The rotation of 4 outer circle of driving gear disc is driven by ratchet driver and pawl；The lengthening of one end and crank of the lever transmission device 2 on right side
End is driven by ratchet driver and pawl outside active ring gear 12 in 45 ° of slanted angles and by fixed screw connection, the other end
Circle rotation.
Semicircle lever transmission device be arc semi-circular shape, arc radius 36-93mm, radius of turn 39-135mm,
For semicircle lever transmission device with crank in the laborsaving angle of inclination at 45 degree of angles or so, ratchet driver is U-shaped, U-shaped
Intermediate width is 6.5mm.
Semicircle lever transmission device 2 carries one end of ratchet driver 19, is in 45 degree with left crank 1 or right crank 11
The laborsaving angle of inclination at angle or so drives the active ring gear 12 for carrying ratchet and 4 outer circle of driving gear disc to do circumference by pawl 22
Rotation, active ring gear 12 is fixed on the outer circle of driven chain fluted disc 14 by fixed screw, to make driven chain fluted disc 14
Stress point in outer circle rather than inner circle.Since the both ends of crank axle 7 and the both ends tie point of transmission shaft 6 are equipped with rolling bearing 9, pass
Moving axis 6 and the both ends tie point of fixing axle 5 are equipped with rolling bearing 8, so when rotating crank axis 7, transmission shaft 6 will not rotate,
When rotating drive shaft 6, fixing axle 5 will not rotate, and each autorotation of three is not interfere with each other, when left and right exert oneself treadled cycle foot
When stepping on, left and right sides crank will be with centered on 7 tie point of crank axle, to move in a circle, left and right sides crank and semicircle
One end of lever transmission device connection will drive semicircle lever transmission device rotation, semicircle lever transmission with the principle of lever
Device drives active ring gear 12 and the outer circle of driving gear disc 4 to do circular-rotation by ratchet driver 19 in a manner of ratchet.
The a diameter of 36mm of fixing axle outer diameter, internal diameter a diameter of 28mm, length 40mm；The a diameter of 26mm of transmission shaft outer diameter,
Internal diameter a diameter of 18mm, length 82mm, crank axle a diameter of 8mm, length 110mm.
Embodiment 3：
It is substantially the same manner as Example 1 in structure the present embodiment provides a kind of moped drive system, but eliminate master
Active toothed disk 4, active ring gear 12, ratchet driver 19 and pawl, including crank and be set with successively from inside to outside crank axle, pass
Moving axis, fixing axle；Transmission shaft one end is fixedly connected with driven chain fluted disc；The both ends of crank axle are respectively fixedly connected with described in two
Crank, one end connection pedal, the other end of crank be connected with lever transmission device, wherein one end of lever transmission device and biography
The other end of moving axis is fixedly connected, and one end of another lever transmission device is fixedly connected with driven chain fluted disc.
Specifically, two cranks, i.e. left crank 1 and the right side are installed in the both ends of crank axle 7 by fixed screw 10 respectively
It is all provided with pedal mounting hole 20 on lateral curvature handle 11, left crank 1 and right crank 11, is easily installed pedal.Crank axle 7 and transmission
Between axis 6, rolling bearing 8,9 is nested between transmission shaft 6 and fixing axle 5 respectively.
2 one end of lever transmission device in left side is fixed together by the extended end of fixed screw 16 and left crank 1,
The other end is directly sleeved on transmission shaft 6 and is fixed together by fixed screw 17.
The chain of driving vehicle wheel rotation is hung on driven 14 periphery of chain fluted disc, driven chain fluted disc 14 is round fluted disc, in
The heart is provided with hole, is sleeved on 6 other end of transmission shaft and is fixed together by fixed screw 15.The lever transmission device 2 on right side
One end is fixed together by the extended end of fixed screw 16 and right crank 11, the other end is direct by fixed screw 24
It is connected to the outer edge of driven chain fluted disc 14.
The external form of lever transmission device can be any one of semicircle, round or arc in the present embodiment.
One end of semicircle lever transmission device or round lever transmission device 23, by fixed screw be fixedly connected on crank with
The part that 7 connecting pin of crank axle lengthens, the other end tilt labour-saving angle in 45 degree with crank and crank axle connecting pin and are inserted in biography
One end of moving axis 6 is directly fixedly connected on one end of transmission shaft 6 by fixed screw.It is bent when firmly treadled cycle is foot-operated
Handle will be with centered on 7 tie point of crank axle, to tilt labour-saving angle in 45 degree with the principle of lever and pass through semicircle lever
Force transmitters or round lever transmission device 23, drive transmission shaft 6 to rotate with the mode for pressing or pulling, and the drive of transmission shaft 6 is fixed on
The driven chain fluted disc 14 of the transmission shaft other end rotates, and driven chain fluted disc 14 is advanced by chain drive bicycle.Thus
Driving gear disc 4 and ratchet driver 19 are eliminated, the overall weight of bicycle had not only been alleviated, but also makes semicircle lever transmission device
Or round lever transmission device 23, it is equally rotated with the principle of lever driving transmission shaft 6, reaches labour-saving effect.Semicircle lever
Force transmitters radius of turn is 39-136mm, and round lever transmission device radius of turn is 45-136mm to 45mm.Arc lever transmission
The radius of turn of device is 39-135mm.
Embodiment 4：
The driving is by a kind of moped, including embodiment 1-3 any one of them moped drive systems
Fixing axle in system is welded as a whole with cycle frame.
Crank one end of ordinary bicycle is fixed together with the intermediate center of circle of chain drive fluted disc, chain drive
The stress point of fluted disc drives the chain in outer circle to rotate in the center of circle, then with the center of circle, therefore to consume many outer active forces.Crank
Lever, fluted disc outer circle stress the principle of moped be that crank is not fixed together with chain drive fluted disc, driven
Chain fluted disc is fixed on one end of transmission shaft by fixed screw, and driving gear disc is fixed on the another of transmission shaft by fixed screw
End.Since active ring gear is fixed on by fixed screw the outer circle of driven chain fluted disc, when point or so firmly treadled cycle foot
When stepping on, crank will be by with centered on crank axle tie point, the semicircle lever transmission device of drive is by ratchet driver, with ratchet
Mode drive the outer circle of active ring gear and driving gear disc to do circular-rotation.Make the stress point of driven chain fluted disc outer circle without
It is inner circle, therefore many outer active forces is saved than ordinary bicycle.Furthermore crank drives with semicircle lever transmission device with ratchet
One end of dynamic device drives active ring gear and driving gear disc outer circle in the laborsaving angle of inclination at 45 degree of angles or so with the principle of lever
Circular-rotation is done, therefore also can greatly save active force outside a part compared with ordinary bicycle.Crank levers, fluted disc outer circle
The moped fixing axle of stress and the both ends tie point of transmission shaft are respectively provided with rolling bearing, the both ends of transmission shaft and fixing axle
Tie point also is provided with rolling bearing, and when rotating crank axis, transmission shaft will not rotate, and when rotating drive shaft, fixing axle will not
Rotation, each autorotation of three are not interfere with each other, and are rotated and are just saved many power than ordinary bicycle.
Claims (8)
1. a kind of moped drive system, which is characterized in that the crank axle that is set with successively including crank and from inside to outside,
Transmission shaft, fixing axle；Described transmission shaft one end is fixedly connected with driven chain fluted disc；The both ends of crank axle are respectively fixedly connected with two
A crank, one end connection pedal, the other end of crank are connected with lever transmission device, wherein a lever transmission device and biography
Moving axis is fixedly connected, and another lever transmission device is fixedly connected with driven chain fluted disc.
2. a kind of moped drive system, which is characterized in that the crank axle that is set with successively including crank and from inside to outside,
Transmission shaft, fixing axle；Described transmission shaft one end is fixedly connected with driving gear disc, the other end is fixedly connected with driven chain fluted disc,
The outer circle of driven chain fluted disc is also associated with active ring gear；The both ends of crank axle are respectively fixedly connected with the crank described in two, bent
One end connection pedal, the other end of handle are connected with lever transmission device, wherein a lever transmission device passes through ratchet driver and spine
Pawl drives the rotation of driving gear disc outer circle, another lever transmission device to drive active ring gear outer circle to turn by ratchet driver and pawl
It is dynamic.
3. moped drive system as claimed in claim 1 or 2, which is characterized in that the crank axle and transmission shaft it
Between, between transmission shaft and fixing axle be nested with rolling bearing respectively；Fixing axle outer diameter is 36-48mm, internal diameter 28-40mm, length
Degree is 40-64mm；Transmission shaft outer diameter is 26-30mm, internal diameter 18-22mm, length 82-101mm；The a diameter of 8- of crank axle
12mm, length 110-146mm.
4. moped drive system as claimed in claim 1 or 2, which is characterized in that the crank passes through with crank axle
Fixed screw is fixed together.
5. moped drive system as claimed in claim 1 or 2, which is characterized in that the external form of the lever transmission device
For semicircle, round or arc；Arc radius is 36-93mm, radius of turn 39-135mm；Semicircle radius be 46-93mm,
Radius of turn is 39-136mm；Circular radius is 45-136mm.
6. moped drive system as described in claim 1, which is characterized in that one end of wherein one lever transmission device
It is connect by fixed screw with the lengthening end of crank, the other end is inserted in one end of transmission shaft and is connected by fixed screw and transmission shaft
It connects；One end of another lever transmission device and the lengthening end of crank by fixed screw connection, the other end by fixed screw with
The outer circle of driven chain fluted disc is fixedly connected；A diameter of 120-188mm of driven chain fluted disc.
7. moped drive system as claimed in claim 2, which is characterized in that one end of wherein one lever transmission device
It is connect with the lengthening end of crank in 45 ° of slanted angles and by fixed screw, the other end is driven by ratchet driver and pawl
Driving gear disc outer circle rotates；One end of another lever transmission device and the lengthening end of crank in 45 ° of slanted angles and pass through fixation
Screw connection, the other end drive the rotation of active ring gear outer circle by ratchet driver and pawl；A diameter of 116- of driving gear disc
209mm, the outer diameter of active ring gear is 116-209mm, internal diameter 96-132mm.
8. a kind of moped, including claim 1-7 any one of them moped drive systems.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201721906447.0U CN207712235U (en) | 2017-12-29 | 2017-12-29 | A kind of moped drive system and moped |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201721906447.0U CN207712235U (en) | 2017-12-29 | 2017-12-29 | A kind of moped drive system and moped |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN207712235U true CN207712235U (en) | 2018-08-10 |
Family
ID=63053886
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201721906447.0U Expired - Fee Related CN207712235U (en) | 2017-12-29 | 2017-12-29 | A kind of moped drive system and moped |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN207712235U (en) |
-
2017
- 2017-12-29 CN CN201721906447.0U patent/CN207712235U/en not_active Expired - Fee Related
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| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20180810 |