CN106286729B - A kind of coaxial line Gear Planet Transmission multi gear variable transmission mechanism - Google Patents
A kind of coaxial line Gear Planet Transmission multi gear variable transmission mechanism Download PDFInfo
- Publication number
- CN106286729B CN106286729B CN201610862903.XA CN201610862903A CN106286729B CN 106286729 B CN106286729 B CN 106286729B CN 201610862903 A CN201610862903 A CN 201610862903A CN 106286729 B CN106286729 B CN 106286729B
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- Prior art keywords
- gear
- connect
- planetary
- clutch
- planet carrier
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- 230000005540 biological transmission Effects 0.000 title claims abstract description 71
- 230000007246 mechanism Effects 0.000 title claims abstract description 59
- 239000000969 carrier Substances 0.000 claims description 6
- 230000008450 motivation Effects 0.000 claims 1
- 244000144983 clutch Species 0.000 description 6
- 238000009434 installation Methods 0.000 description 4
- 238000010586 diagram Methods 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000003638 chemical reducing agent 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
- F16H—GEARING
- F16H3/00—Toothed gearings for conveying rotary motion with variable gear ratio or for reversing rotary motion
- F16H3/44—Toothed gearings for conveying rotary motion with variable gear ratio or for reversing rotary motion using gears having orbital motion
- F16H3/62—Gearings having three or more central gears
-
- 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
- F16H—GEARING
- F16H57/00—General details of gearing
- F16H57/02—Gearboxes; Mounting gearing therein
- F16H57/023—Mounting or installation of gears or shafts in the gearboxes, e.g. methods or means for assembly
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- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Structure Of Transmissions (AREA)
Abstract
The invention discloses a kind of coaxial line Gear Planet Transmission multi gear variable transmission mechanisms,There are one input terminals for its tool,One output terminal,It includes input shaft,Clutch,Brake,Output shaft and by sun gear,Planetary gear,Planet carrier,The epicyclic transmission mechanism of gear ring composition,Clutch is multiple,Corresponding multiple gears,Every grade of clutch is connect with individual epicyclic transmission mechanism,The sun gear of multiple epicyclic transmission mechanisms,Input shaft,Output shaft is set on the same axis,Input shaft is connect by clutch with the level-one sun gear of different stalls epicyclic transmission mechanism,Brake I is connected on the level-one sun gear of each epicyclic transmission mechanism,The final stage planet carrier of epicyclic transmission mechanism is connect by final stage planetary gear with gear ring,Final stage planet carrier is connected with brake II,Gear ring is connected with exporting axis,The mechanism can not only realize the multi gear speed change of coaxial line Gear Planet Transmission,And it can realize the different transmissions that different stalls gearratio differs greatly,And follower gear rotating speed will not be excessively high and influence normally travel.
Description
Technical field
The present invention relates to retarder fields, are especially a kind of coaxial line Gear Planet Transmission multi gear variable transmission mechanism.
Background technology
Gear Planet Transmission is widely used in many fields, at present, not yet occurs the multistage planet transmission of coaxial line in the market
Mechanism, and to realize the gearshift of planetary mechanism, the particularly speed reducer gearshift of multi gear, large transmission ratio, and do not influence normal row
The shift transmission mechanism sailed.
Invention content
It is an object of the invention to solve above-mentioned technical problem, a kind of coaxial line Gear Planet Transmission multi gear gear machine is provided
Structure, the mechanism can not only realize the multi gear speed change of coaxial line Gear Planet Transmission, and can realize that different stalls gearratio differs
The different transmissions of great disparity, and follower gear rotating speed will not be excessively high and influence normally travel.
For achieving the above object, the technical solution used in the present invention is：
A kind of coaxial line Gear Planet Transmission multi gear variable transmission mechanism, it has, and there are one input terminals, and an output terminal, it includes
Input shaft, clutch, brake, output shaft and the epicyclic transmission mechanism being made of sun gear, planetary gear, planet carrier, gear ring,
Clutch is multiple, and corresponding multiple gears, every grade of clutch is connect with individual epicyclic transmission mechanism, multiple epicyclic transmission mechanisms
Sun gear, input shaft, output shaft setting on the same axis, input shaft passes through clutch and different stalls epicyclic transmission mechanism
The connection of level-one sun gear, be connected with brake I, the end of epicyclic transmission mechanism on the level-one sun gear of each epicyclic transmission mechanism
Grade planet carrier is connect by final stage planetary gear with gear ring, and final stage planet carrier is connected with brake II, and gear ring is connected with exporting axis.
The epicyclic transmission mechanism is driven the either multistage envelope of secondary seal formula Gear Planet Transmission for primary planet
Closed Planetary Gear, such as each gear clutch are correspondingly connected with the group of Gear Planet Transmission at the same level Gear Planet Transmission either not at the same level
Conjunction form.
When certain gear clutch and primary planet transmission structure are connect, primary planet carrier is final stage planet carrier, input shaft
It is connect with the gear clutch, which connect with level-one sun gear, and level-one sun gear engages connection with planetary gear, row
Star-wheel is arranged on final stage planet carrier and is attached thereto, and final stage planet carrier engages connection, final stage planet carrier and brake with gear ring
II connection, gear ring are connected with exporting axis.
When certain gear is connect with secondary seal formula epicyclic transmission mechanism, input shaft is connect with the gear clutch, the shelves
Position clutch is connect with level-one sun gear, and level-one sun gear is connected with brake I, and level-one sun gear is engaged with primary planet wheel,
Primary planet wheel is engaged with primary annulus, and primary planet wheel is connect with primary planet carrier, and primary planet carrier connects with secondary solar gear
It connects, secondary solar gear is engaged with secondary planet wheel, and secondary planet wheel is engaged with two level gear ring, secondary planet wheel and secondary planet frame
Connection, secondary planet frame are connect with brake II, and secondary planet frame is final stage planet carrier at this time；
When certain gear is connect with N grades of Closed planetary transmission mechanisms, input shaft is connect with the gear clutch, the gear
Clutch is connect with level-one sun gear, and level-one sun gear connecting brake I, level-one sun gear is engaged with primary planet wheel, level-one
Planetary gear is engaged with primary annulus, and primary planet wheel is connect with primary planet carrier, and primary planet carrier is connect with next stage sun gear,
Until N-1 grades of planet carriers are connect with N grades of sun gears, N grades of sun gears are engaged with N grades of planetary gears, and N grades of planetary gears are nibbled with N grades of gear rings
It closes, N grades of planetary gears are connect with final stage planet carrier, final stage planet carrier connecting brake II.
The corresponding clutch of each gear is connect with individual epicyclic transmission mechanism, each epicyclic transmission mechanism
Level-one sun gear at be provided with brake I, brake II is provided at final stage planet carrier.
The sun gear of each epicyclic transmission mechanism is set with for coaxial line, does not influence to rotate each other.
The gear ring integral type connection of all gears.
The maneuverability pattern of the brake I and brake II is any among M- is motor-driven, H- surges, P- is pneumatic, E- is electronic
One or two kinds of combining forms.
The type of the clutch is engaged clutch or slip clutch or electromagnetic clutch or centrifugal friction
Clutch, the maneuverability pattern of clutch can be：Any or a variety of group among M- is motor-driven, H- surges, P- is pneumatic, E- is electronic
Conjunction form.
The present invention operation principle be：
Each gear is cooperated by input terminal brake I and final stage planetary carrier brake II, makes each shelves planetary mechanism
It is operated in active state or is servo-actuated state in low speed：Input terminal brake is opened, and final stage planet carrier is closed, which has the initiative
State；Input terminal arrester close, final stage planet carrier are opened, which is in low speed and is servo-actuated state.
All gear clutchs are opened, and when the input terminal brake of some gear is opened, remaining gear input terminal is braked
Device is closed, which is closed, remaining gear final stage planetary carrier brake is opened, which closes
It closes, gear planetary mechanism work, remaining gear planetary mechanism enters low speed and is servo-actuated state, and gearshift output is a kind of to be turned
Speed；When second gear needs work, the clutch of work at present gear is opened, and the input terminal brake of work at present gear closes
It closes, the final stage planetary carrier brake of work at present gear is opened, and the input terminal brake of second gear is opened, second gear
Final stage planetary carrier brake be closed, the clutch of second gear is closed, second gear planetary mechanism work, remaining gear
Planetary mechanism enters low speed and is servo-actuated state, another rotating speed of gearshift output；And so on.
When each shelves reduction ratio difference is not especially big, any one gear input, remaining gear is servo-actuated, all servo-actuated shelves
When rotatable parts are no more than its permission rotating speed, input terminal brake and the final stage planetary carrier brake of all gears can be uneasy
Dress.
Can also installation brake selectively be carried out according to the servo-actuated rotating speed of each shelves, i.e.,：Need the shelves of installation brake
Just installation upper brake, the gear for not needing to installation brake are not installed for position.
Input terminal brake is installed, while brake is installed on each shelves final stage planet carrier in each shelves input terminal, solves
The problem of follower gear rotating speed is too high.Such as：First grade of gearratio is 3, and the gearratio of second gear is：i=134- 1=28560 or
Bigger, when first grade of active, although the gearratio of second gear is very big, second gear remains able to low speed and is servo-actuated！It needs a certain
The gearratio of a gear becomes much larger, as long as increasing the series of this grade of planetary reduction gear, increases the diameter of gearshift after series
Do not have to increase to size, axial dimension is the superposition of planetary mechanism axial dimensions at different levels.
Beneficial effects of the present invention are：
A kind of coaxial line Gear Planet Transmission multi gear variable transmission mechanism is provided, which can realize coaxial line Gear Planet Transmission
Multi gear speed change, and the planetary mechanism of idle shelves is in low speed and is servo-actuated state；The realization range of each grade of gearratio becomes much larger, example
Such as：When the shelves are made of Pyatyi Closed planetary transmission, gearratio can reach i=134- 1=28560, even so big
Gearratio, after increasing input terminal brake and final stage planetary carrier brake, the planetary mechanism of this grade also can low speed be servo-actuated, work as grade
When number increases, gearratio being capable of bigger；The gearratio of some gear is needed to become much larger, as long as increasing this grade of planetary reduction gear
Series, increase series after gearshift radial dimension do not have to increase, axial dimension is planetary mechanism axial direction ruler at different levels
Very little superposition compared to more parallel axes multi gear gears, saves a large amount of space；The gearshift is an independent gearshift list
Member, each relatively independent design of shelves increase or decrease that gear is easy, are a kind of the axially stacking of each shelves planetary mechanism or reduce, and hold
It easily realizes modularized design, forms combination coaxial line Gear Planet Transmission multi gear variable transmission mechanism, that is, improve design efficiency, and carry
High production efficiency；For multiple clutch positions of the mechanism in input terminal, structure is easy to implement；Answering for planetary mechanism is expanded
Use field.
Description of the drawings
Fig. 1 is 1 theory structure schematic diagram of the embodiment of the present invention；
Fig. 2 is 2 theory structure schematic diagram of the embodiment of the present invention.
Specific embodiment
Embodiment 1：A kind of one grade is 2K-H（A）Type, another shelves are passed for the coaxial line planet of level Four Closed planetary transmission
It moves two grades of speed changes and follower gear to slowly run mechanism, it includes input shaft, clutch, brake, sun gear, planetary gear, row
Carrier, gear ring, planetary gear are separately positioned on by bearing on planet carrier, and sun gear is connect by planetary gear with gear ring.
The input shaft 1 is connect with first clutch 4, and first clutch 4 is connect with one grade of sun gear 6, one grade of input terminal
Brake I 5 is connect with one grade of sun gear 6, and one grade of sun gear 6 is connect with one grade of planetary gear 8, one grade of planetary gear 8 and one grade of gear ring 9
Connection, one grade of planetary gear 8 are arranged on one grade of planet carrier 7, and one grade of planet carrier 7 and one grade of final stage planetary carrier brake II 10 connect
It connects.
The input shaft 1 is connect with two grades of clutches 3, and two grades of clutches 3 are connect with two grades of level-one sun gears 14, and two grades defeated
Enter to hold brake I 3 to be connect with level-one sun gear 14, level-one sun gear 14 is connect with primary planet wheel 12, primary planet wheel 12 with
Primary annulus 13 connects, and primary planet wheel 12 is connect with primary planet carrier 11, and primary planet carrier 11 is connect with secondary solar gear 17,
Secondary solar gear 17 is connect with secondary planet wheel 15, and secondary planet wheel 15 is connect with two level gear ring 16, secondary planet wheel 15 and two
Grade planet carrier 18 connects, and secondary planet frame 18 is connect with three-level sun gear 22, and three-level sun gear 22 is connect with third-level planetary wheel 20,
Third-level planetary wheel 20 is connect with three-level gear ring 19, and third-level planetary wheel 20 is connect with third-level planetary frame 21, third-level planetary frame 21 and four
Grade sun gear 26 connects, and level Four sun gear 26 is connect with level Four planetary gear 24, and level Four planetary gear 24 is connect with level Four gear ring 23, and four
Grade planetary gear 24 is connect with final stage planet carrier 25, and two grades of final stage planet carriers 25 are connect with two grades of final stage planetary carrier brakes II 27.
The sun gear of each epicyclic transmission mechanism is set with for coaxial line, and axis is not contacted each other with axis, does not influence to turn
It is dynamic.
Described two 9,13,16,19,23 integral type of gear gear ring connections.
Described one grade is 2K-H（A）Type Gear Planet Transmission, another shelves are passed for the coaxial line planet of level Four Closed planetary transmission
Two grades of speed changes and follower gear is moved to slowly run mechanism, two gear clutchs are opened, and first grade of input terminal brake I 5 is opened,
Second gear input terminal brake I 3 is closed, and first grade of final stage planetary carrier brake II 10 is closed, the braking of second gear final stage planet carrier
Device II 27 is opened, and first clutch 3 is closed, and first grade of epicyclic transmission mechanism work, the gearshift exports the first rotating speed；
First clutch 3 is opened, and first grade of input terminal brake II 10 is closed, and second gear input terminal brake I 5 is opened, first grade
Final stage planetary carrier brake II 10 is opened, and second gear final stage planetary carrier brake II 27 is closed, and second gear clutch 3 is closed, the
Two grades of Gear Planet Transmission work, the gearshift export second of rotating speed.
The type of the clutch is engaged clutch or slip clutch or electromagnetic clutch or centrifugal friction
Clutch, the maneuverability pattern of clutch can be：Any or a variety of group among M- is motor-driven, H- surges, P- is pneumatic, E- is electronic
Conjunction form.
During dynamic output, in addition to the gear of passing power, all rotating members of remaining gear are servo-actuated, each gear
Input terminal brake cooperates with final stage planetary carrier brake, and original high speed servo is become low speed and is servo-actuated.
Embodiment 2：A kind of two gears are 2K-H（A）Two grades of speed changes of coaxial line Gear Planet Transmission and follower gear of type
Slowly run mechanism, it includes input shaft, clutch, sun gear, planetary gear, planet carrier, gear ring, and planetary gear is set by bearing
On planet carrier, sun gear is connect by planetary gear with gear ring.
The input shaft 1 is connect with first clutch 4, and first clutch 4 is connect with one grade of sun gear 6, one grade of input terminal
Brake I 5 is connect with one grade of sun gear 6, and one grade of sun gear 6 is connect with one grade of planetary gear 8, one grade of planetary gear 8 and one grade of gear ring 9
Connection, one grade of planetary gear 8 are arranged on one grade of planet carrier 7, and one grade of planet carrier 7 and one grade of final stage planetary carrier brake II 10 connect
It connects.
The input shaft 1 is connect with two grades of clutches 2, and two grades of clutches 2 are connect with two grades of sun gears 14, two grades of input terminals
Brake I 3 is connect with two grades of sun gears 14, and two grades of sun gears 14 are connect with two grades of planetary gears 12, two grades of planetary gears 12 and two grades
Gear ring 13 connects, and two grades of planetary gears 12 are arranged on two grades of planet carriers 11, and two grades of planet carriers 11 and two grades of final stage planet carriers are braked
Device II 15 connects.
Described two gear gear ring connections.
Embodiment described above is not the limitation to technical solution of the present invention protection domain, each gear can be level-one
The combination of planetary reduction gear or multistage Closed planetary transmission mechanism or different type Gear Planet Transmission.It is same to change
The epicyclic transmission mechanism type of each shelves can be identical in retaining device, also can be different.When each shelves reduction ratio difference is not special
Greatly, any one gear inputs, remaining gear is servo-actuated, when all servo-actuated shelves rotatable parts are no more than its permission rotating speed, institute
The input terminal brake and final stage planetary carrier brake for having gear can not be installed.
Claims (2)
1. a kind of coaxial line Gear Planet Transmission multi gear variable transmission mechanism, it has there are one input terminal, an output terminal, it includes defeated
Enter axis, clutch, brake, output shaft and the epicyclic transmission mechanism being made of sun gear, planetary gear, planet carrier, gear ring, from
Clutch is multiple, and corresponding multiple gears, every grade of clutch is connect with individual epicyclic transmission mechanism, multiple epicyclic transmission mechanisms
On the same axis, input shaft passes through clutch and different stalls epicyclic transmission mechanism for sun gear, input shaft, output shaft setting
Level-one sun gear connects, and brake I, the final stage of epicyclic transmission mechanism are connected on the level-one sun gear of each epicyclic transmission mechanism
Planet carrier is connect by final stage planetary gear with gear ring, and final stage planet carrier is connected with brake II, and gear ring is connected with exporting axis；It is described
Epicyclic transmission mechanism be driven for primary planet or N grade Closed planetary transmissions, wherein N not equal to 1, it is characterized in that：When certain
When gear clutch is connect with primary planet transmission structure, primary planet carrier is final stage planet carrier, input shaft and the gear clutch
Device connects, which connect with level-one sun gear, and level-one sun gear engages connection with planetary gear, and planetary gear is arranged on end
It on grade planet carrier and is attached thereto, final stage planet carrier engages connection, final stage planet carrier and brake II with gear ring by planetary gear
Connection, gear ring are connected with exporting axis；When certain gear is connect with N grades of Closed planetary transmission mechanisms, input shaft and the gear from
Clutch connects, which connect with level-one sun gear, level-one sun gear connecting brake I, level-one sun gear and level-one
Planetary gear engages, and primary planet wheel is engaged with primary annulus, and primary planet wheel is connect with primary planet carrier, and primary planet carrier is under
Level-one sun gear connects, and until N-1 grades of planet carriers are connect with N grades of sun gears, N grades of sun gears are engaged with N grades of planetary gears, N grades of rows
Star-wheel is engaged with N grades of gear rings, and N grades of planetary gears are connect with final stage planet carrier, final stage planet carrier connecting brake II.
2. coaxial line Gear Planet Transmission multi gear variable transmission mechanism according to claim 1, it is characterized in that：The planet passes
The sun gear of motivation structure is set with for coaxial line, does not influence to rotate each other.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610862903.XA CN106286729B (en) | 2016-09-29 | 2016-09-29 | A kind of coaxial line Gear Planet Transmission multi gear variable transmission mechanism |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610862903.XA CN106286729B (en) | 2016-09-29 | 2016-09-29 | A kind of coaxial line Gear Planet Transmission multi gear variable transmission mechanism |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN106286729A CN106286729A (en) | 2017-01-04 |
| CN106286729B true CN106286729B (en) | 2018-06-19 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201610862903.XA Active CN106286729B (en) | 2016-09-29 | 2016-09-29 | A kind of coaxial line Gear Planet Transmission multi gear variable transmission mechanism |
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Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107489744A (en) * | 2017-09-30 | 2017-12-19 | 熊建文 | More clutch speed changers |
| CN115055083A (en) * | 2022-06-16 | 2022-09-16 | 山东大学 | Variable-speed and variable-direction rotary stirring device and working method |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0305045B1 (en) * | 1987-07-22 | 1991-12-27 | Toyota Jidosha Kabushiki Kaisha | Planetary gear type speed change device to provide six speed stages with two single pinion type simple planetary gear mechanisms |
| CN1637316A (en) * | 2003-12-30 | 2005-07-13 | 现代自动车株式会社 | Six-speed powertrain of an automatic transmission |
| CN101021253A (en) * | 2006-02-14 | 2007-08-22 | Zf腓德烈斯哈芬股份公司 | Multi-gear transmission |
| CN206175581U (en) * | 2016-09-29 | 2017-05-17 | 泰山医学院 | Many grades of variable transmission mechanism of coaxial line planet transmission |
Family Cites Families (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE3840685A1 (en) * | 1988-12-02 | 1990-06-07 | Bosch Gmbh Robert | WHEEL BRAKE FOR VEHICLES |
| US5816972A (en) * | 1995-11-23 | 1998-10-06 | Hyundai Motor Company | Transmission with simple planetary gear sets |
| KR100559335B1 (en) * | 2004-03-09 | 2006-03-15 | 현대자동차주식회사 | 7-shift power train in an automatic transmission for vehicles |
-
2016
- 2016-09-29 CN CN201610862903.XA patent/CN106286729B/en active Active
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0305045B1 (en) * | 1987-07-22 | 1991-12-27 | Toyota Jidosha Kabushiki Kaisha | Planetary gear type speed change device to provide six speed stages with two single pinion type simple planetary gear mechanisms |
| CN1637316A (en) * | 2003-12-30 | 2005-07-13 | 现代自动车株式会社 | Six-speed powertrain of an automatic transmission |
| CN101021253A (en) * | 2006-02-14 | 2007-08-22 | Zf腓德烈斯哈芬股份公司 | Multi-gear transmission |
| CN206175581U (en) * | 2016-09-29 | 2017-05-17 | 泰山医学院 | Many grades of variable transmission mechanism of coaxial line planet transmission |
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| Publication number | Publication date |
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| CN106286729A (en) | 2017-01-04 |
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Inventor after: Zhao Zhenjie Inventor after: Zhang Zhaochen Inventor after: Wang Fumin Inventor after: Li Wenfeng Inventor after: Wang Dan Inventor before: Zhao Zhenjie Inventor before: Xu Xiling |
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Effective date of registration: 20180521 Address after: No. 619, the Great Wall Road, Daiyue District, Tai'an, Shandong Applicant after: TAISHAN MEDICAL University Applicant after: Wang Fumin Address before: No. 619, the Great Wall Road, Daiyue District, Tai'an, Shandong Applicant before: TAISHAN MEDICAL University Applicant before: Xu Xiling |
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Address after: No. 6699, Qingdao Road, Huaiyin District, Jinan City, Shandong Province Patentee after: Shandong First Medical University (Shandong Academy of Medical Sciences) Patentee after: Wang Fumin Address before: No. 619, the Great Wall Road, Daiyue District, Tai'an, Shandong Patentee before: TAISHAN MEDICAL University Patentee before: Wang Fumin |
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Effective date of registration: 20231225 Address after: Room 511, Building B5-B, Shuntai Plaza, No. 2000 Shunhua Road, High tech Zone, Jinan City, Shandong Province, 250000 Patentee after: Shandong Olive Intelligent Technology Co.,Ltd. Address before: No. 6699, Qingdao Road, Huaiyin District, Jinan City, Shandong Province Patentee before: Shandong First Medical University (Shandong Academy of Medical Sciences) Patentee before: Wang Fumin |
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