CN111169591A - Shaft transmission structure of variable-speed bicycle - Google Patents
Shaft transmission structure of variable-speed bicycle Download PDFInfo
- Publication number
- CN111169591A CN111169591A CN202010017196.0A CN202010017196A CN111169591A CN 111169591 A CN111169591 A CN 111169591A CN 202010017196 A CN202010017196 A CN 202010017196A CN 111169591 A CN111169591 A CN 111169591A
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- sleeve
- transmission shaft
- transmission
- drive
- gear
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B62—LAND VEHICLES FOR TRAVELLING OTHERWISE THAN ON RAILS
- B62M—RIDER PROPULSION OF WHEELED VEHICLES OR SLEDGES; POWERED PROPULSION OF SLEDGES OR SINGLE-TRACK CYCLES; TRANSMISSIONS SPECIALLY ADAPTED FOR SUCH VEHICLES
- B62M17/00—Transmissions characterised by use of rotary shaft, e.g. cardan shaft
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B62—LAND VEHICLES FOR TRAVELLING OTHERWISE THAN ON RAILS
- B62M—RIDER PROPULSION OF WHEELED VEHICLES OR SLEDGES; POWERED PROPULSION OF SLEDGES OR SINGLE-TRACK CYCLES; TRANSMISSIONS SPECIALLY ADAPTED FOR SUCH VEHICLES
- B62M11/00—Transmissions characterised by the use of interengaging toothed wheels or frictionally-engaging wheels
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- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Transportation (AREA)
- Mechanical Engineering (AREA)
- General Details Of Gearings (AREA)
Abstract
The invention relates to the technical field of bicycles and discloses a shaft transmission structure of a variable-speed bicycle. This variable speed bicycle's axle drive structure, when the assembly, back transmission shaft cover and preceding transmission shaft cover can remove respectively, mesh with back drive gear and preceding drive gear in proper order, mutual noninterference, requirement greatly reduced to the cooperation precision, the reduction production and the assembly degree of difficulty, ordinary people also can assemble and simple maintenance, be convenient for popularize, on the other hand, can only change the wearing and tearing gear when one side gear excessively wears out, need not wholly change, reduce use cost, secondly, axis and rear axle all can change speed, simple structure realizes multistage variable speed, weight distribution is even simultaneously, the structure is lighter, it is relatively light when riding, simultaneously variable speed simple structure, be convenient for maintain, the reliability is higher.
Description
Technical Field
The invention relates to the technical field of bicycle equipment, in particular to a shaft transmission structure of a variable-speed bicycle.
Background
The bicycle has two transmission modes of chain transmission and shaft transmission, although the transmission mode is basically chain transmission and the shaft transmission is relatively rarely applied in the market, the transmission efficiency is high due to the high reliability of the shaft transmission.
Although the gear transmission has higher transmission ratio, the requirement on precision is high, the long shaft of the shaft-driven bicycle is simultaneously in transmission connection with the middle shaft and the rear shaft, the requirement on matching precision is higher, the production difficulty and the assembly difficulty are increased, particularly, non-professional personnel are difficult to assemble and maintain due to higher assembly requirement, and the popularization of shaft transmission is restricted.
Secondly, the variable speed is usually realized through the gearbox of installation in rear axle position to current axle transmission bicycle, on the one hand, can increase the vehicle production and assemble the degree of difficulty, still causes the automobile body overweight simultaneously, and the focus also leans towards the rear, and on the other hand, the gearbox also increases the degree of difficulty that the vehicle was maintained, has reduced axle transmission bicycle's reliability, has reduced transmission efficiency simultaneously, consequently axle transmission bicycle does not all have the variable speed function usually.
Disclosure of Invention
In view of the above-mentioned deficiencies of the background art, the present invention provides a technical solution for a shaft transmission structure of a variable speed bicycle, which has the advantages of simple structure, easy use, etc., and solves the problems presented by the background art.
The invention provides the following technical scheme: a shaft transmission structure of a variable-speed bicycle comprises a frame, a rear transmission gear and a front transmission gear, wherein at least two groups of gears are arranged on the rear transmission gear and the front transmission gear respectively, the rear transmission gear and the front transmission gear are respectively arranged on a rear shaft and a middle shaft of the frame, a connecting shaft is arranged between the rear transmission gear and the front transmission gear, the outer side wall of the connecting shaft is sleeved with a rear transmission shaft sleeve, a front transmission shaft sleeve and a middle connection driving pipe, the rear transmission shaft sleeve is in transmission connection with the rear transmission gear, the front transmission shaft sleeve is in transmission connection with the front transmission gear, two ends of the middle connection driving pipe are respectively in threaded connection with the rear transmission shaft sleeve and the front transmission shaft sleeve, a control piece for controlling the synchronous rotation or pairwise synchronous rotation of the rear transmission shaft sleeve and the front transmission shaft sleeve and the middle connection driving pipe is sleeved between the middle connection driving pipe and the connecting shaft, and a driving block for controlling, the synchronous rotation condition of the rear transmission shaft sleeve, the front transmission shaft sleeve and the middle connecting driving pipe is controlled by the driving block to control the control piece.
Preferably, rear drive axle sleeve and preceding drive axle sleeve symmetry set up and the structure is the same, rear drive axle sleeve and preceding drive axle sleeve are close to in one section of connecting the driving tube and all are equipped with the spacing groove, in the middle part of connecting the driving tube is equipped with the spout, the quantity of control is two sets of, and correspond respectively with rear drive axle sleeve and preceding drive axle sleeve, the both ends of control all are equipped with the spacing groove that corresponds respectively with preceding drive axle sleeve and the arch of well connection driving tube middle part spout, and one of them arch can break away from with the cooperation in groove.
Preferably, the bearing is fixedly connected between the inner wall of the middle connecting driving pipe and the connecting shaft, the bearings between the inner walls of the rear transmission shaft sleeve and the front transmission shaft sleeve and the connecting shaft are in sliding connection, and the inner walls of the bearings are fixedly connected with the connecting shaft.
Preferably, the control piece is provided with a positioning sleeve and a spring piece, the positioning sleeve is attached to the inner wall of the middle connection driving pipe, a gap is reserved between the positioning sleeve and the outer wall of the connecting shaft, the positioning sleeve is close to the fixedly connected spring piece of the rear transmission shaft sleeve or the front transmission shaft sleeve, and two axial sides of a bulge on the spring piece are inclined planes.
Preferably, the driving block is arranged inside the connecting shaft and is T-shaped, an opening for the driving block to move is formed in the connecting shaft, the positioning groove is provided with an annular groove corresponding to the driving block, and a return spring for enabling the driving block to recover to the original position is sleeved on the outer side wall of the driving block.
The invention has the following beneficial effects:
1. this variable-speed bicycle's axle drive structure, when the assembly, back transmission shaft cover and preceding transmission shaft cover can remove respectively, mesh with back drive gear and preceding drive gear in proper order, mutual noninterference, requirement greatly reduced to the cooperation precision reduces the production and assembles the degree of difficulty, and ordinary people also can assemble and simple maintenance, is convenient for popularize, and on the other hand, can only change the wearing and tearing gear when one side gear excessively wears out, need not wholly change, reduces use cost.
2. This variable speed bicycle's axle drive structure, axis and rear axle all can change speed, and multistage variable speed is realized to simple structure, and weight distribution is even simultaneously, and the structure is lighter, and it is relatively light to ride, and the while variable speed simple structure is convenient for maintain, and the reliability is higher.
Drawings
FIG. 1 is a schematic illustration of an explosive structure according to the present invention;
FIG. 2 is a partial cross-sectional view of the present invention;
FIG. 3 is a partial schematic view of the present invention;
FIG. 4 is a schematic view of a front outdrive according to the present invention;
FIG. 5 is a schematic view of a control member of the present invention;
FIG. 6 is a schematic view of the connection drive tube of the present invention;
fig. 7 is an assembly view of the present invention.
In the figure: 1. a frame; 2. a rear drive gear; 3. a front drive gear; 4. a connecting shaft; 5. a rear drive shaft sleeve; 6. a front driving shaft sleeve; 7. the middle is connected with a driving pipe; 8. a control member; 81. a positioning sleeve; 82. a spring plate; 83. positioning a groove; 9. a drive block; 10. a return spring.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the 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 invention.
Referring to fig. 1-7, a shaft transmission structure of a variable speed bicycle comprises a frame 1, a rear transmission gear 2 and a front transmission gear 3, wherein at least two sets of gears are respectively arranged on the rear transmission gear 2 and the front transmission gear 3, the rear transmission gear 2 and the front transmission gear 3 are respectively arranged on a rear shaft and a middle shaft of the frame 1, a connecting shaft 4 is arranged between the rear transmission gear 2 and the front transmission gear 3, one end of the connecting shaft 4 is sleeved on the frame 1, the other end of the connecting shaft is movably connected with the frame 1 through a flange plate, so as to facilitate the assembly of the connecting shaft 4, a rear transmission shaft sleeve 5, a front transmission shaft sleeve 6 and a middle connection driving pipe 7 are sleeved on the outer side wall of the connecting shaft 4, bearings are arranged between the connecting shaft 4 and the rear transmission shaft sleeve 5, between the front transmission shaft sleeve 6 and between the middle connection driving pipe 7, so as to avoid sliding friction and improve the transmission, the front transmission shaft sleeve 6 is in transmission connection with the front transmission gear 3, two ends of a middle connection driving pipe 7 are respectively in threaded connection with a rear transmission shaft sleeve 5 and the front transmission shaft sleeve 6, a control piece 8 for controlling the rear transmission shaft sleeve 5, the front transmission shaft sleeve 6 and the middle connection driving pipe 7 to synchronously rotate or rotate two by two is sleeved between the middle connection driving pipe 7 and a connecting shaft 4, the rear transmission shaft sleeve 5, the front transmission shaft sleeve 6 and the middle connection driving pipe 7 synchronously rotate to realize transmission, when the current transmission shaft sleeve 6 does not synchronously rotate with the middle connection driving pipe 7 or the rear transmission shaft sleeve 5 does not synchronously rotate with the middle connection driving pipe 7, the rear transmission shaft sleeve 5 or the front transmission shaft sleeve 6 moves to change a gear in transmission connection with the rear transmission shaft sleeve 5 or the front transmission shaft sleeve 6, a driving block 9 for controlling the control piece 8 is arranged on the connecting shaft 4, and the control of the rear transmission shaft sleeve 5 or the front transmission shaft sleeve 6 is further controlled by, Synchronous rotation of the front driving shaft sleeve 6 and the middle connecting driving pipe 7.
Wherein, back transmission shaft cover 5 and preceding transmission shaft cover 6 symmetry set up and the structure is the same, be convenient for change and reduction in production cost, back transmission shaft cover 5 and preceding transmission shaft cover 6 are close to in one section of connecting drive tube 7 and all are equipped with the spacing groove, in connect the middle part of drive tube 7 and be equipped with the spout, the quantity of control 8 is two sets of, and correspond respectively with back transmission shaft cover 5 and preceding transmission shaft cover 6, the both ends of control 8 all are equipped with the spacing groove that corresponds respectively with preceding transmission shaft cover 6 and the arch of well middle part spout of connecting drive tube 7, and the cooperation in one of them arch and groove can break away from, when its cooperation realize preceding transmission shaft cover 6 and well synchronous rotation of connecting drive tube 7 or back transmission shaft cover 5 and well connecting drive tube 7, when it breaks away from, then desynchrony rotation.
The inner wall of the middle connection driving pipe 7 is fixedly connected with the connecting shaft 4 through a bearing, the inner walls of the rear transmission shaft sleeve 5 and the front transmission shaft sleeve 6 are in sliding connection with the bearing between the connecting shaft 4, the inner wall of the bearing is fixedly connected with the connecting shaft 4, the middle connection driving pipe 7 is not moved, and the rear transmission shaft sleeve 5 and the front transmission shaft sleeve 6 can move.
The control member 8 is provided with a positioning sleeve 81 and a spring piece 82, the positioning sleeve 81 is attached to the inner wall of the middle connecting driving pipe 7, a gap is reserved between the positioning sleeve 81 and the outer wall of the connecting shaft 4, the control member 8 does not contact with the connecting shaft 4 when rotating along with the middle connecting driving pipe 7, friction is avoided, the positioning sleeve 81 is close to the fixedly connected spring piece 82 of the rear driving shaft sleeve 5 or the front driving shaft sleeve 6, two axial sides of a bulge on the spring piece 82 are set to be inclined planes, when the control member 8 moves, the bulge is separated from a limiting groove of the front driving shaft sleeve 6 or the rear driving shaft sleeve 5 under the action of the inclined planes, and the control member does not rotate synchronously with the middle connecting driving pipe.
Wherein, the drive block 9 is arranged inside the connecting shaft 4, the drive block 9 is "T" shaped, the connecting shaft 4 is provided with an opening for the drive block 9 to move, the positioning groove 83 is provided with an annular groove corresponding to the drive block 9, the drive block 9 does not influence the rotation of the control member 8, but can drive the control member 8 to move, the outer side wall of the drive block 9 is sleeved with a reset spring 10 for restoring the drive block 9 to the original position, one end of the drive block 9 is fixedly connected with a steel wire rope for driving the drive block 9 and the control member 8 to move, and the distance of the drive block 9 moving once is the same as the sum of the distance between two rings of gears.
The working principle and the using process of the invention are as follows:
when the bicycle normally runs, the two control pieces 8 connect the rear transmission shaft sleeve 5, the front transmission shaft sleeve 6 and the middle connection driving pipe 7 into a whole to enable the rear transmission shaft sleeve and the middle connection driving pipe to synchronously rotate for normal transmission, when the speed is changed, the middle connection driving pipe and the rear shaft can be selectively changed for speed change, if the speed is changed, the control pieces 8 are moved through the steel wire rope, the bulges of the spring pieces 82 are retracted between the connecting shaft 4 and the rear transmission shaft sleeve 5 under the action of the inclined plane, the middle connection driving pipe 7 and the rear transmission shaft sleeve 5 relatively rotate under the action of rear wheel load, the rear transmission shaft sleeve 5 axially moves until the bulges are matched, the transmission gear is changed, the speed regulation of the rear wheel is completed, and the process is.
It is noted that, herein, relational terms such as first and second, and the like may be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus.
Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.
Claims (5)
1. The utility model provides a variable speed bicycle's axle drive structure, includes frame (1), back drive gear (2) and preceding drive gear (3), all be equipped with two sets of gears on back drive gear (2) and preceding drive gear (3) at least, install respectively on the rear axle and the axis of frame (1) back drive gear (2) and preceding drive gear (3), its characterized in that: a connecting shaft (4) is arranged between the rear transmission gear (2) and the front transmission gear (3), the outer side wall of the connecting shaft (4) is sleeved with a rear transmission shaft sleeve (5), a front transmission shaft sleeve (6) and a middle connection driving pipe (7), the rear transmission shaft sleeve (5) is in transmission connection with the rear transmission gear (2), the front transmission shaft sleeve (6) is in transmission connection with the front transmission gear (3), the two ends of the middle connection driving pipe (7) are in threaded connection with the rear transmission shaft sleeve (5) and the front transmission shaft sleeve (6) respectively, a control part (8) for controlling the synchronous rotation or the synchronous rotation of every two of the rear transmission shaft sleeve (5), the front transmission shaft sleeve (6) and the middle connection driving pipe (7) is sleeved between the middle connection driving pipe (7) and the connecting shaft (4), and a driving block (9) for controlling the control part (8) is arranged on the connecting shaft (4), the synchronous rotation of the rear transmission shaft sleeve (5), the front transmission shaft sleeve (6) and the middle connection driving pipe (7) is controlled by the control piece (8) through the driving block (9).
2. The shaft transmission structure of a variable speed bicycle according to claim 1, wherein: rear drive axle sleeve (5) and preceding drive axle sleeve (6) symmetry set up and the structure is the same, one section that rear drive axle sleeve (5) and preceding drive axle sleeve (6) are close to in connecting driving tube (7) all is equipped with the spacing groove, the middle part of in connecting driving tube (7) is equipped with the spout, the quantity of control (8) is two sets of, and corresponds respectively with rear drive axle sleeve (5) and preceding drive axle sleeve (6), the both ends of control (8) all are equipped with the spacing groove that corresponds respectively with preceding drive axle sleeve (6) and the arch of well connecting driving tube (7) middle part spout, and one of them arch can break away from with the cooperation in groove.
3. The shaft transmission structure of a variable speed bicycle according to claim 1, wherein: the middle connecting driving pipe (7) is fixedly connected with the connecting shaft (4) through a bearing, the inner walls of the rear transmission shaft sleeve (5) and the front transmission shaft sleeve (6) are connected with the connecting shaft (4) through a sliding bearing, and the inner wall of the bearing is fixedly connected with the connecting shaft (4).
4. The shaft transmission structure of a variable speed bicycle according to claim 2, wherein: be equipped with position sleeve (81) and spring leaf (82) on control piece (8), the inner wall laminating of position sleeve (81) and well connection driving tube (7), the outer wall of position sleeve (81) and connecting axle (4) leaves the clearance, fixedly connected with spring leaf (82) that position sleeve (81) are close to back transmission shaft cover (5) or preceding transmission shaft cover (6), protruding axial both sides on spring leaf (82) are established to the inclined plane.
5. The shaft transmission structure of a variable speed bicycle according to claim 4, wherein: inside connecting axle (4) was located in drive block (9), drive block (9) are "T" shape, be equipped with the opening that supplies drive block (9) to remove on connecting axle (4), constant head tank (83) are equipped with the ring channel that corresponds with drive block (9), the lateral wall cover of drive block (9) is equipped with reset spring (10) that makes its recovery normal position.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010017196.0A CN111169591B (en) | 2020-01-08 | 2020-01-08 | Shaft transmission structure of variable-speed bicycle |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010017196.0A CN111169591B (en) | 2020-01-08 | 2020-01-08 | Shaft transmission structure of variable-speed bicycle |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN111169591A true CN111169591A (en) | 2020-05-19 |
| CN111169591B CN111169591B (en) | 2021-05-14 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202010017196.0A Active CN111169591B (en) | 2020-01-08 | 2020-01-08 | Shaft transmission structure of variable-speed bicycle |
Country Status (1)
| Country | Link |
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| CN (1) | CN111169591B (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112298447A (en) * | 2020-11-10 | 2021-02-02 | 上海龙创汽车设计股份有限公司 | Brand-new bicycle transmission device |
| CN114179959A (en) * | 2021-12-28 | 2022-03-15 | 常州洪记两轮智能交通工具有限公司 | Easy-to-dismount and convenient electric bicycle |
Citations (12)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5622081A (en) * | 1995-12-29 | 1997-04-22 | Clements; Thomas M. | Multiple speed shaft drive for a bicycle |
| US6755431B2 (en) * | 2002-09-03 | 2004-06-29 | Yu-Ching Chang | Derailleur system for bicycle |
| CN101868403A (en) * | 2007-11-20 | 2010-10-20 | 马智贤 | Gear-driven assembly of transmission gear shifting |
| FR2965601B1 (en) * | 2010-10-01 | 2012-10-05 | Christian Manteau | TRANSMISSION WITH VARIATION OF SPEED |
| CN205186403U (en) * | 2015-09-29 | 2016-04-27 | 北京摩拜科技有限公司 | Two wheeler and frame, integrated chassis, chassis main part thereof |
| WO2017179750A1 (en) * | 2016-04-14 | 2017-10-19 | 조광희 | Chainless bicycle |
| CN206871303U (en) * | 2017-06-14 | 2018-01-12 | 宁波巨隆机械股份有限公司 | A kind of axle for bicycle transmission component |
| CN207060324U (en) * | 2017-04-18 | 2018-03-02 | 昆明理工大学 | One kind transmission variable-ratio bicycle |
| CN208089750U (en) * | 2018-04-08 | 2018-11-13 | 重庆龙璟纸业有限公司 | A kind of movable axis |
| CN109204679A (en) * | 2018-10-11 | 2019-01-15 | 常熟市谷雷特机械产品设计有限公司 | A kind of stable transmission mechanism of bicycle shift |
| CN109263785A (en) * | 2018-09-05 | 2019-01-25 | 王春闪 | A kind of energy conservation and environmental protection construction transloading equipment |
| CN110382341A (en) * | 2016-12-29 | 2019-10-25 | 河太焕 | Multistage speed-changing bicycle |
-
2020
- 2020-01-08 CN CN202010017196.0A patent/CN111169591B/en active Active
Patent Citations (12)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5622081A (en) * | 1995-12-29 | 1997-04-22 | Clements; Thomas M. | Multiple speed shaft drive for a bicycle |
| US6755431B2 (en) * | 2002-09-03 | 2004-06-29 | Yu-Ching Chang | Derailleur system for bicycle |
| CN101868403A (en) * | 2007-11-20 | 2010-10-20 | 马智贤 | Gear-driven assembly of transmission gear shifting |
| FR2965601B1 (en) * | 2010-10-01 | 2012-10-05 | Christian Manteau | TRANSMISSION WITH VARIATION OF SPEED |
| CN205186403U (en) * | 2015-09-29 | 2016-04-27 | 北京摩拜科技有限公司 | Two wheeler and frame, integrated chassis, chassis main part thereof |
| WO2017179750A1 (en) * | 2016-04-14 | 2017-10-19 | 조광희 | Chainless bicycle |
| CN110382341A (en) * | 2016-12-29 | 2019-10-25 | 河太焕 | Multistage speed-changing bicycle |
| CN207060324U (en) * | 2017-04-18 | 2018-03-02 | 昆明理工大学 | One kind transmission variable-ratio bicycle |
| CN206871303U (en) * | 2017-06-14 | 2018-01-12 | 宁波巨隆机械股份有限公司 | A kind of axle for bicycle transmission component |
| CN208089750U (en) * | 2018-04-08 | 2018-11-13 | 重庆龙璟纸业有限公司 | A kind of movable axis |
| CN109263785A (en) * | 2018-09-05 | 2019-01-25 | 王春闪 | A kind of energy conservation and environmental protection construction transloading equipment |
| CN109204679A (en) * | 2018-10-11 | 2019-01-15 | 常熟市谷雷特机械产品设计有限公司 | A kind of stable transmission mechanism of bicycle shift |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112298447A (en) * | 2020-11-10 | 2021-02-02 | 上海龙创汽车设计股份有限公司 | Brand-new bicycle transmission device |
| CN114179959A (en) * | 2021-12-28 | 2022-03-15 | 常州洪记两轮智能交通工具有限公司 | Easy-to-dismount and convenient electric bicycle |
Also Published As
| Publication number | Publication date |
|---|---|
| CN111169591B (en) | 2021-05-14 |
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Effective date of registration: 20210428 Address after: 321105 zone B, Zhuge industrial functional zone, Lanxi City, Jinhua City, Zhejiang Province Applicant after: LANXI CHIHANG MACHINERY Co.,Ltd. Address before: No. 83, Baihe Village, Sanmiao Town, Hechuan District, Chongqing 400000 Applicant before: Zuo Gang |
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