CN111347876B - Rear axle of formula car and formula car - Google Patents
Rear axle of formula car and formula car Download PDFInfo
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- CN111347876B CN111347876B CN202010185769.0A CN202010185769A CN111347876B CN 111347876 B CN111347876 B CN 111347876B CN 202010185769 A CN202010185769 A CN 202010185769A CN 111347876 B CN111347876 B CN 111347876B
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- pair
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60K—ARRANGEMENT OR MOUNTING OF PROPULSION UNITS OR OF TRANSMISSIONS IN VEHICLES; ARRANGEMENT OR MOUNTING OF PLURAL DIVERSE PRIME-MOVERS IN VEHICLES; AUXILIARY DRIVES FOR VEHICLES; INSTRUMENTATION OR DASHBOARDS FOR VEHICLES; ARRANGEMENTS IN CONNECTION WITH COOLING, AIR INTAKE, GAS EXHAUST OR FUEL SUPPLY OF PROPULSION UNITS IN VEHICLES
- B60K17/00—Arrangement or mounting of transmissions in vehicles
- B60K17/04—Arrangement or mounting of transmissions in vehicles characterised by arrangement, location, or kind of gearing
- B60K17/12—Arrangement or mounting of transmissions in vehicles characterised by arrangement, location, or kind of gearing of electric gearing
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60B—VEHICLE WHEELS; CASTORS; AXLES FOR WHEELS OR CASTORS; INCREASING WHEEL ADHESION
- B60B35/00—Axle units; Parts thereof ; Arrangements for lubrication of axles
- B60B35/12—Torque-transmitting axles
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Transportation (AREA)
- Arrangement Of Transmissions (AREA)
- Retarders (AREA)
Abstract
The application provides rear axle and equation motorcycle race of equation motorcycle race, the rear axle includes: the device comprises a pair of driving motors with the same specification, a pair of gear reducers with the same structure, a pair of wheel shafts with the same structure, a pair of reducer supports with the same structure and a pair of motor supports with the same structure; the pair of gear reducers are fixedly arranged on the frame through the pair of reducer supports respectively; the top of the box body of the gear reducer is provided with a first mounting hole; the pair of driving motors are fixedly arranged on the frame through the pair of motor supports respectively, and output shafts of the pair of driving motors are in transmission connection with the pair of gear reducers respectively; one end of each of the pair of wheel shafts is fixedly connected with the output end of the gear reducer, and the other end of each of the pair of wheel shafts is fixedly connected with the left wheel and the right wheel respectively. The technical problem of how to improve the transmission stability of the formula car transmission system and reduce the occupied space of the transmission system on the frame is solved.
Description
Technical Field
The application relates to the technical field of formula cars, in particular to a rear axle of a formula car and the formula car.
Background
The transmission systems of the existing formula racing cars are all chain wheel transmission systems, however, the polygonal effect must exist in the chain wheel transmission, the uniformity and the synchronism of the transmission motion can be seriously influenced by the polygonal effect, the transmission ratio is unstable, if the polygonal effect is weakened, a large chain wheel needs to be adopted, however, the large chain wheel and a chain very occupy the space in a frame, the whole car arrangement is not facilitated, and the transmission stability is still insufficient. Therefore, how to improve the transmission stability of the transmission system of the formula car and reduce the occupied space of the transmission system on the car frame becomes a technical problem to be solved urgently by those skilled in the art.
Disclosure of Invention
The application aims to provide a rear axle of an equation car and the equation car, and solves the technical problem of how to improve the transmission stability of a transmission system of the equation car and reduce the occupied space of the transmission system on a frame.
In view of the above, the present application provides a rear axle of an equation car, comprising: the device comprises a pair of driving motors with the same specification, a pair of gear reducers with the same structure, a pair of wheel shafts with the same structure, a pair of reducer supports with the same structure and a pair of motor supports with the same structure;
the pair of gear reducers are fixedly arranged on the frame through the pair of reducer supports respectively; the top of the box body of the gear reducer is provided with a first mounting hole, and the first mounting hole is fixedly connected with the frame through a frame lifting lug;
the pair of driving motors are fixedly arranged on the frame through the pair of motor supports respectively, and output shafts of the pair of driving motors are in transmission connection with the pair of gear reducers respectively;
one end of each of the pair of wheel shafts is fixedly connected with the output end of the gear reducer, and the other end of each of the pair of wheel shafts is fixedly connected with the left wheel and the right wheel respectively.
Further, the gear reducer is a planetary reducer.
Furthermore, an internal spline is embedded in the middle shaft part of a sun gear of the gear reducer;
and an output shaft of the driving motor is in fit connection with the inner spline of the sun gear through a spline.
Furthermore, a pressure release valve is arranged on the box body of the gear speed reducer.
Furthermore, the speed reducer support comprises a bearing part and two supporting legs, and the two supporting legs are respectively and fixedly connected with the frame through frame lifting lugs;
the gear speed reducer is fixedly arranged on the bearing part.
Further, the motor support is in a tripod shape;
second mounting holes are formed in three vertex angle parts of the motor support, and the second mounting holes are fixedly arranged on the frame through lifting lugs respectively;
the driving motor is fixedly arranged on the central part of the motor bracket.
Furthermore, the motor support is in a shape of a tripod with symmetrical circumference.
Further, the motor protection cover is further included;
the motor protection cover is sleeved outside the driving motor, and the middle shaft of the motor protection cover is hollow and used for enabling the output shaft of the driving motor to penetrate out.
The application also provides an equation car, including above-mentioned rear axle.
Compared with the prior art, the embodiment of the application has the advantages that:
the application provides a rear axle of equation motorcycle race, includes: the device comprises a pair of driving motors with the same specification, a pair of gear reducers with the same structure, a pair of wheel shafts with the same structure, a pair of reducer supports with the same structure and a pair of motor supports with the same structure; the pair of gear reducers are fixedly arranged on the frame through the pair of reducer supports respectively; the top of the box body of the gear reducer is provided with a first mounting hole, and the first mounting hole is fixedly connected with the frame through a frame lifting lug; the pair of driving motors are fixedly arranged on the frame through the pair of motor supports respectively, and output shafts of the pair of driving motors are in transmission connection with the pair of gear reducers respectively; one end of each of the pair of wheel shafts is fixedly connected with the output end of the gear reducer, and the other end of each of the pair of wheel shafts is fixedly connected with the left wheel and the right wheel respectively.
The rear axle of equation motorcycle race that provides in this application, driving motor's output shaft is connected with the gear reducer transmission, gear reducer's output and the one end fixed connection of axletree, thereby this application has adopted gear drive's mode to replace sprocket drive in the past, the production of polygon effect has been avoided, for chain drive, gear drive's transmission stability is higher, it is littleer to mechanical shock, transmission efficiency is higher, stability when can promote equation motorcycle race walking better, and shared car inner space far is less than the occupation space of sprocket and chain, more be favorable to the overall arrangement in the frame, reduce the technical problem of transmission system to the occupation space of frame when having solved how to improve equation motorcycle race transmission system's transmission stability.
Drawings
In order to more clearly illustrate the detailed description of the present application or the technical solutions in the prior art, the drawings needed to be used in the detailed description of the present application or the prior art description will be briefly introduced below, and it is obvious that the drawings in the following description are some embodiments of the present application, and other drawings can be obtained by those skilled in the art without creative efforts.
Fig. 1 is a schematic structural diagram of a rear axle provided in an embodiment of the present application;
FIG. 2 is a schematic diagram of a partial structure of a rear axle according to an embodiment of the present disclosure;
FIG. 3 is an exploded view of a gear reducer in an embodiment of the present application;
fig. 4 is a partial structural schematic diagram of a gear reducer in the embodiment of the present application;
FIG. 5 is an exploded view of the drive motor in an embodiment of the present application;
FIG. 6 is a schematic structural view of a wheel axle in an embodiment of the present application;
wherein the reference numerals are: the device comprises a driving motor 1, a gear reducer 2, a wheel shaft 3, a reducer support 4, a motor support 5, a first mounting hole 6, a pressure release valve 7, a bearing part 8, a supporting leg 9, a second mounting hole 10, a motor protective cover 11, a transmission shaft 12, a three-ball pin 13, a box body 14, an end cover 15, an inner ball cage 16, a sun wheel 17, a planet wheel 18 and a planet carrier 19.
Detailed Description
The technical solutions of the present application will be described clearly and completely with reference to the accompanying drawings, and it should be understood that the described embodiments are only some embodiments of the present application, but not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.
In the description of the present application, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience of description and simplicity of description, and do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, should not be construed as limiting the present application. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.
Unless expressly stated or limited otherwise, the terms "mounted," "connected," and "connected" are intended to be inclusive and mean, for example, that they may be fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meaning of the above terms in the present application can be understood in a specific case by those of ordinary skill in the art.
For easy understanding, please refer to fig. 1 to 6, fig. 1 is a schematic structural diagram of a rear axle according to an embodiment of the present application; FIG. 2 is a schematic diagram of a partial structure of a rear axle according to an embodiment of the present disclosure; FIG. 3 is an exploded view of a gear reducer in an embodiment of the present application; fig. 4 is a partial structural schematic diagram of a gear reducer in the embodiment of the present application; FIG. 5 is an exploded view of the drive motor in an embodiment of the present application; fig. 6 is a schematic structural view of a wheel axle in an embodiment of the present application.
The application provides a rear axle of equation motorcycle race, includes: the device comprises a pair of driving motors 1 with the same specification, a pair of gear reducers 2 with the same structure, a pair of wheel shafts 3 with the same structure, a pair of reducer supports 4 with the same structure and a pair of motor supports 5 with the same structure;
the pair of gear reducers 2 are fixedly arranged on the frame through a pair of reducer supports 4 respectively; a first mounting hole 6 is formed in the top of a box body 14 of the gear reducer 2, and the first mounting hole 6 is fixedly connected with the frame through a lifting lug;
the pair of driving motors 1 are fixedly arranged on the frame through a pair of motor supports 5 respectively, and output shafts of the pair of driving motors 1 are in transmission connection with the pair of gear reducers 2 respectively;
one end of the pair of wheel shafts 3 is fixedly connected with the output end of the gear reducer 2, and the other end of the pair of wheel shafts 3 is respectively fixedly connected with the left wheel and the right wheel.
It should be noted that, two connecting rods parallel to the wheel axle 3 are fixedly arranged at the bottom of the rear axle mounting portion of the racing car frame, the speed reducer support 4 is fixedly arranged on the two connecting rods through the lifting lugs, the gear speed reducer 2 is fixedly connected with the speed reducer support 4, a bulge is arranged at the topmost position of the box body 14 of the gear speed reducer 2, a first mounting hole 6 is formed in the bulge, the first mounting hole 6 is fixedly connected with the car frame through the car frame lifting lug, and therefore the gear speed reducer 2 is more stably mounted through the double fixing of the speed reducer support 4 and the mounting hole.
The output shaft of driving motor 1 passes through bolted connection fixed the setting on driving motor 1, and driving motor 1 is the special motor of equation motorcycle race, and the input of gear reducer 2 is connected with driving motor 1's output shaft transmission for reduce the rotational speed, improve the moment of torsion.
The wheel shaft 3 is respectively fixedly connected with the left wheel and the right wheel, so that the driving motor 1 drives the wheel shaft 3 to rotate through the speed reducer, the wheel shaft 3 drives the left wheel and the right wheel to rotate respectively, the motion of the formula racing car is realized, and the rotating speeds of the two driving motors 1 are controlled to be always equal through a control machine and an algorithm.
Each wheel shaft 3 comprises a transmission shaft 12 and two three-ball pins 13, the two three-ball pins 13 are respectively arranged at two ends of the transmission shaft 12 in a spline fit mode, one three-ball pin 13 is fixedly connected with the output end of the gear reducer 2, and the other three-ball pin 13 is fixedly connected with the middle shaft of a wheel.
The rear axle of equation motorcycle race that provides in this application, driving motor 1's output shaft is connected with 2 transmissions of gear reducer, gear reducer 2's output and axletree 3's one end fixed connection, thereby this application has adopted gear drive's mode to replace sprocket drive in the past, the production of polygon effect has been avoided, for chain drive, gear drive's transmission stability is higher, it is littleer to mechanical shock, transmission efficiency is higher, stability when can promote equation motorcycle race walking better, and shared car inner space is far less than the occupation space of sprocket and chain, more be favorable to the overall arrangement in the frame, how to reduce the technical problem of transmission system to the occupation space of frame when improving equation motorcycle race transmission system's transmission stability has been solved in this application.
As a further improvement, the gear reducer 2 of the rear axle of the formula car provided in the embodiment of the present application is a planetary reducer, and the planetary reducer has a relatively smaller volume and better transmission stability compared with other reducers.
Specifically, the gear reducer 2 comprises a box body 14, an end cover 15, an inner ball cage 16, a sealing ring, a sun gear 17, three planet gears 18 and a planet carrier 19, wherein the box body 14 is provided with a bolt hole matched with the end cover 15, and the end cover 15 is fixedly arranged on the box body 14; the box body 14 is provided with a hole matched with the oil seal for fixedly installing the oil seal; a sealing ring groove is formed in the box body 14 and used for fixing a sealing ring; the middle part of the end cover 15 is hollowed and fixedly provided with a cylindrical roller bearing, the cylindrical roller bearing is used for being matched and connected with an output shaft of the driving motor 1, the sun wheel 17 is rotatably arranged at the middle shaft part of the box body 14, the sun wheel 17 is in transmission connection with the output shaft of the driving motor 1, the three planet wheels 18 are circumferentially and symmetrically arranged around the sun wheel 17, needle roller bearings are arranged in the three planet wheels 18, three connecting pins of the planet carrier 19 are respectively matched and connected with the needle roller bearings of the three planet wheels 18, the middle shaft part of the planet carrier 19 is fixedly connected with an inner ball cage 16, and the inner ball cage 16 is used for being matched and connected with a three ball pin 13 of the wheel shaft 3.
As a further improvement, the spline is embedded in the middle shaft part of the sun gear 17 of the gear speed reducer 2 provided in the embodiment of the present application, and the output shaft of the driving motor 1 is connected with the internal spline of the sun gear 17 in a matching manner through the spline, so that the output shaft of the driving motor 1 is directly connected with the sun gear 17 in a matching manner through the spline, a middle connecting shaft is omitted, the installation space is further saved, the loss of mechanical efficiency is reduced, and the transmission efficiency is improved.
As a further improvement, the case 14 of the gear reducer 2 provided in the embodiment of the present application is provided with the relief valve 7, so that the problem that the air pressure inside the gear reducer 2 is too high due to a temperature rise or the like can be prevented.
As a further improvement, the speed reducer support 4 of the rear axle provided by the embodiment of the present application includes a support portion 8 and two support legs 9, the two support legs 9 are respectively and fixedly connected with the frame through the frame lifting lugs, and the gear speed reducer 2 is fixedly arranged on the support portion 8.
Specifically, two bolt holes are formed in the box 14 of the gear reducer 2 at positions corresponding to the bearing portions 8, the two bolt holes are fixedly connected with the bearing portions 8 through bolts, and pressure is divided equally through the two supporting legs 9, so that the gear reducer is more stably mounted.
As a further improvement, the motor bracket 5 provided in the embodiment of the present application is in a tripod shape, the three vertex angles of the motor bracket 5 are all provided with second mounting holes 10, and the second mounting holes 10 are respectively fixedly arranged on the frame through lifting lugs; driving motor 1 is fixed to be set up on motor support 5's central point, because driving motor 1 weight is great itself, and the cycle racing has certain vibration when the walking, consequently through the motor support 5 that adopts the tripod form to disperse into three points to driving motor 1's weight, alleviateed driving motor 1 support's burden, and be favorable to improving driving motor 1 and connected to the frame's steadiness.
As a further improvement, the motor bracket 5 provided in the embodiment of the present application has a circumferentially symmetrical tripod shape, so that the weight of the driving motor 1 is divided into three supporting angles.
As further improvement, the rear axle that this application embodiment provided still includes motor protection cover 11, and the outside of driving motor 1 is located to motor protection cover 11 cover, and the axis position fretwork of motor protection cover 11 for make driving motor 1's output shaft wear out, motor protection cover 11 can protect driving motor 1 not advance impurity such as dust, extension driving motor 1's life.
The application also provides a formula car, which comprises the rear axle provided by any one of the embodiments.
The above embodiments are only used for illustrating the technical solutions of the present application, and not for limiting the same; although the present application has been described in detail with reference to the foregoing embodiments, it should be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some or all of the technical features may be equivalently replaced; and the modifications or the substitutions do not make the essence of the corresponding technical solutions depart from the scope of the technical solutions of the embodiments of the present application.
Claims (7)
1. A rear axle for a formula racer, comprising: the device comprises a pair of driving motors with the same specification, a pair of gear reducers with the same structure, a pair of wheel shafts with the same structure, a pair of reducer supports with the same structure and a pair of motor supports with the same structure;
the pair of gear reducers are fixedly arranged on the frame through the pair of reducer supports respectively; the top of the box body of the gear reducer is provided with a first mounting hole, and the first mounting hole is fixedly connected with the frame through a frame lifting lug;
the pair of driving motors are fixedly arranged on the frame through the pair of motor supports respectively, and output shafts of the pair of driving motors are in transmission connection with the pair of gear reducers respectively;
one ends of the pair of wheel shafts are fixedly connected with the output ends of the pair of gear speed reducers, and the other ends of the pair of wheel shafts are respectively fixedly connected with the left wheel and the right wheel;
the speed reducer support comprises a bearing part and two supporting legs, the two supporting legs are symmetrically arranged, the two supporting legs are respectively and fixedly connected with a frame through frame lifting lugs, and the gear speed reducer is fixedly arranged on the bearing part;
the bottom of the frame is provided with two connecting rods parallel to the wheel shaft, and the two supporting legs are fixedly arranged on the two connecting rods through lifting lugs;
the gear reducer is a planetary reducer and comprises a box body, an end cover, an inner ball cage, a sealing ring, a sun gear, three planet gears and a planet carrier, wherein the box body is provided with a bolt hole matched with the end cover, and the end cover is fixedly arranged on the box body through the bolt hole; the box body is provided with a hole matched with the oil seal and a sealing ring groove for fixing a sealing ring;
the middle part of the end cover is hollowed out, and a cylindrical roller bearing is fixedly arranged and is used for being matched and connected with an output shaft of a driving motor;
the sun wheel is rotatably arranged at the middle shaft part of the box body, the sun wheel is in transmission connection with an output shaft of the driving motor, the three planet wheels circumferentially and symmetrically surround the sun wheel, needle roller bearings are arranged in the three planet wheels, three connecting pins of the planet carrier are respectively in matched connection with the needle roller bearings of the three planet wheels, an inner ball cage is fixedly connected at the middle shaft part of the planet carrier, and the inner ball cage is used for being in matched connection with a three-ball pin of a wheel shaft.
2. The rear axle of the formula car as claimed in claim 1, wherein the central shaft portion of the sun gear of the gear reducer is embedded with an internal spline;
and an output shaft of the driving motor is in fit connection with the inner spline of the sun gear through a spline.
3. The rear axle of the formula car according to claim 1, wherein a pressure relief valve is provided on a case of the gear reducer.
4. The formula car rear axle of claim 1, wherein the motor bracket is tripod-shaped;
second mounting holes are formed in three vertex angle parts of the motor support, and the second mounting holes are fixedly arranged on the frame through lifting lugs respectively;
the driving motor is fixedly arranged on the central part of the motor bracket.
5. The equation car rear axle of claim 4, wherein the motor support is in the shape of a circumferentially symmetrical tripod.
6. The formula car rear axle of claim 1, further comprising a motor boot;
the motor protection cover is sleeved outside the driving motor, and the middle shaft of the motor protection cover is hollow and used for enabling the output shaft of the driving motor to penetrate out.
7. An equation racer, comprising the rear axle of any one of claims 1-6.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010185769.0A CN111347876B (en) | 2020-03-17 | 2020-03-17 | Rear axle of formula car and formula car |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010185769.0A CN111347876B (en) | 2020-03-17 | 2020-03-17 | Rear axle of formula car and formula car |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN111347876A CN111347876A (en) | 2020-06-30 |
| CN111347876B true CN111347876B (en) | 2021-11-26 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202010185769.0A Expired - Fee Related CN111347876B (en) | 2020-03-17 | 2020-03-17 | Rear axle of formula car and formula car |
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| CN (1) | CN111347876B (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113124132A (en) * | 2021-04-13 | 2021-07-16 | 泰兴市康森爱特传动设备科技有限公司 | Planetary reducer for multi-drive gearbox |
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| CN203516537U (en) * | 2013-10-25 | 2014-04-02 | 陕西汉德车桥有限公司 | Parking brake mounting support and automobile main speed reducer assembly |
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| CN205970845U (en) * | 2016-08-05 | 2017-02-22 | 浙江工业大学 | University student's equation motorcycle race transmission structure |
| CN107685621A (en) * | 2017-08-29 | 2018-02-13 | 广东工业大学 | A kind of electric car and dual motors drive transmission system |
| CN109737186A (en) * | 2019-01-22 | 2019-05-10 | 北京航空航天大学 | A kind of electronic equation motorcycle race wheel side epicyclic reduction gear unit |
| CN110803221A (en) * | 2019-11-27 | 2020-02-18 | 浙江科技学院 | Integrated auxiliary frame for formula vehicle |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106427510A (en) * | 2016-10-28 | 2017-02-22 | 长安大学 | Formula E drive system |
| CN206141327U (en) * | 2016-11-08 | 2017-05-03 | 长安大学 | Two rear axle strutting arrangement of motor drive system of FSEC |
| CN206141310U (en) * | 2016-11-08 | 2017-05-03 | 长安大学 | FSEC wheel edge motor bearing structure |
| CN106427553A (en) * | 2016-11-08 | 2017-02-22 | 长安大学 | Rear axle support device of FSEC dual-motor driving system |
| CN207825936U (en) * | 2018-01-16 | 2018-09-07 | 北京汽车研究总院有限公司 | A kind of main reducing gear centre fixing bracket and the vehicle with it |
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2020
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Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN203516537U (en) * | 2013-10-25 | 2014-04-02 | 陕西汉德车桥有限公司 | Parking brake mounting support and automobile main speed reducer assembly |
| CN205026043U (en) * | 2015-10-19 | 2016-02-10 | 长安大学 | Cycle racing differential mechanism casing assembly device |
| CN205970845U (en) * | 2016-08-05 | 2017-02-22 | 浙江工业大学 | University student's equation motorcycle race transmission structure |
| CN107685621A (en) * | 2017-08-29 | 2018-02-13 | 广东工业大学 | A kind of electric car and dual motors drive transmission system |
| CN109737186A (en) * | 2019-01-22 | 2019-05-10 | 北京航空航天大学 | A kind of electronic equation motorcycle race wheel side epicyclic reduction gear unit |
| CN110803221A (en) * | 2019-11-27 | 2020-02-18 | 浙江科技学院 | Integrated auxiliary frame for formula vehicle |
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| CN111347876A (en) | 2020-06-30 |
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Granted publication date: 20211126 |