CN104595437A - Composite continuously-variable transmission - Google Patents
Composite continuously-variable transmission Download PDFInfo
- Publication number
- CN104595437A CN104595437A CN201510059191.3A CN201510059191A CN104595437A CN 104595437 A CN104595437 A CN 104595437A CN 201510059191 A CN201510059191 A CN 201510059191A CN 104595437 A CN104595437 A CN 104595437A
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- square
- point
- input
- output
- remittance
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Classifications
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- 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
- F16H3/76—Toothed gearings for conveying rotary motion with variable gear ratio or for reversing rotary motion using gears having orbital motion with an orbital gear having teeth formed or arranged for obtaining multiple gear ratios, e.g. nearly infinitely variable
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- 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
- F16H2200/00—Transmissions for multiple ratios
- F16H2200/20—Transmissions using gears with orbital motion
Abstract
The invention provides a composite continuously-variable transmission. The technical scheme adopted by the composite continuously-variable transmission has the key points that a converged moment input element (21) and a one-way clutch (10) are connected with an input shaft (1); a converged moment output element (23) is connected with a first fractal moment input element (31); each of the rest of the fractal moment input elements (31) is connected with a corresponding previous fractal moment connection output element (34); the last fractal moment connection output element (34) is connected with an output gear pair (5); a gear shifting mechanism (6) is connected with a controllable moment device (7) and a converged-moment input controllable moment device (11); an input gear pair (9) is connected with a converged moment reflow element (24); the converged-moment input controllable moment device (11) is connected with a converged moment input gear pair (12); each fractal moment output element (33) is connected with an output shaft (4).
Description
Technical field
The invention belongs to speed changer field, more particularly, it is a kind of compound stepless speed variator for various surface car, boats and ships, railway locomotive, engineering machinery, various space flight, aircraft, metallurgy, mine, oil, chemical industry, light industry, food, weaving, handling machinery, lathe, robot and military project.
Background technique
At present, conventional stepless speed variator all designs according to principles such as friction, hydrostaticss, and the power that it can transmit is little, and efficiency is not high; In addition, these stepless speed variator complex structures, manipulation trouble, and could need be realized by the material of costliness and accurate manufacture, therefore cost is high.
Summary of the invention
Instant invention overcomes the deficiencies in the prior art, provide a kind of working life extending motor and power train, structure is simple, and manipulation is convenient, low cost, the compound stepless speed variator of efficient energy-saving.
In order to realize object of the present invention, below the technical solution used in the present invention:
A kind of compound stepless speed variator, comprise input shaft (1), output shaft (4), output gear wheel set (5), gear (6), torque-controllable device (7), fixing overrunning clutch (8), input gear pair (9), overrunning clutch (10), the square that converges inputs torque-controllable device (11), remittance square input gear pair (12), the input end (81) of described fixing overrunning clutch (8) connects with fixed element, be provided with several between described input shaft (1) and output shaft (4) and converge square unit (2) and point square unit (3), described remittance square unit (2) comprises remittance square input element (21), remittance square planetary pinion (22), remittance square output element (23), remittance square back-flow component (24), square unit (3) is divided to comprise a point square input element (31), divide square planetary pinion (32), divide square output element (33), square is divided to connect output element (34), each remittance square unit (2) and point square unit (3) are coupled to each other by the element coordinated separately, the remittance square input element (21) of remittance square unit (2) and the output terminal (102) of overrunning clutch (10) connect with input shaft (1), the remittance square output element (23) of square unit (2) that converges connects with a point square input element (31) for first point of square unit (3), point square input element (31) of all the other each point of square unit (3) connects output element (34) with point square going up a point of square unit (3) separately and connects, point square of last point of square unit (3) connects output element (34) and connects with the input gear (51) of other element and output gear wheel set (5), the output gear (52) of output gear wheel set (5) connects with the input end (61) of gear (6), the input end (111) that the output terminal (62) of gear (6) inputs torque-controllable device (11) with the input end (71) of torque-controllable device (7) and the square that converges connects, the output terminal (72) of torque-controllable device (7) and the output terminal (82) of fixing overrunning clutch (8) connect with the input gear (91) of input gear pair (9), the output gear (92) of input gear pair (9) connects with the remittance square back-flow component (24) of remittance square unit (2), the output terminal (112) that the square that converges inputs torque-controllable device (11) connects with the input gear (121) of remittance square input gear pair (12), the output gear (122) of remittance square input gear pair (12) connects with the input end (101) of overrunning clutch (10), a point square output element (33) for each point of square unit (3) connects with output shaft (4).
Described remittance square unit (2) is the planetary gear mechanism in differential gear train, few tooth difference transmission mechanism, cycloidal-pin wheel planetary gearing mechanism or harmonic gear drive mechanism.
Square unit (3) is divided to be the planetary gear mechanism in differential gear train, few tooth difference transmission mechanism, cycloidal-pin wheel planetary gearing mechanism or harmonic gear drive mechanism.
Described remittance square unit (2) is planetary gear mechanism, few tooth difference transmission mechanism, cycloidal-pin wheel planetary gearing mechanism or harmonic gear drive mechanism, its remittance square input element (21), remittance square output element (23) and square back-flow component (24) that converges can be selected from the element forming above-mentioned planetary gear mechanism, few tooth difference transmission mechanism, cycloidal-pin wheel planetary gearing mechanism or harmonic gear drive mechanism, and it plays the effect converging moment.
Described point of square unit (3) is planetary gear mechanism, few tooth difference transmission mechanism, cycloidal-pin wheel planetary gearing mechanism or harmonic gear drive mechanism, its point of square input element (31), point square output element (33) and point square connect output element (34) and can select from the element forming above-mentioned planetary gear mechanism, few tooth difference transmission mechanism, cycloidal-pin wheel planetary gearing mechanism or harmonic gear drive mechanism, and it plays the effect of shunting power.
Described torque-controllable device (7) can select automatically controlled or hydraulic control friction clutcch, fluid coupling, fluid torque converter, oil hydraulic pump and oil hydraulic motor; Torque-controllable device (7), when there being speed discrepancy, can export input torque automatically or passively, and wherein, if the torque-controllable device (7) selected is coupler or fluid torque converter, it can realize the output of input torque automatically; If the torque-controllable device (7) selected is the clutch of various torque-controllable or oil hydraulic pump and oil hydraulic motor, it then to need under the control of artificial or computer, by changing the size of electric current or hydraulic pressure, could realize the output of input torque.
When being applied to vehicle, velocity variations when the present invention can travel according to vehicle and be subject to drag size, automatically, infinitely changes velocity ratio.
The present invention has following advantage:
(1) the present invention does not have other gear shift and operating mechanism, and therefore structure is simple, be conducive to reducing the cost manufactured, be easier to maintenance, and manipulation is convenient;
(2) the power major part of motor of the present invention is by high efficiency and can transmit powerful remittance square unit 2 and divide a square unit 3 and transmit, displacement and speed change automatically complete, high efficiency, powerful variable transmission can be realized, and except starting, motor can be made at the operated within range of the best, compared with other stepless speed variator, under the prerequisite of motor equivalence, that reduce the manufacture cost of motor;
(3) the present invention is by stepless change, motor is in economic speed region and operates, namely work in the speed range of very little disposal of pollutants, avoid motor when idling and high speed operation, discharge large quantity of exhaust gas, thus decrease the discharge of waste gas, be conducive to protection of the environment;
(4) the present invention can utilize inner speed discrepancy to play buffering and overload protection, is conducive to the working life extending motor and power train, in addition, when running resistance increases, then can make the automatic reduction of speed of vehicle, on the contrary then raising speed, be conducive to the rideability improving vehicle;
(5) the present invention is by stepless change, makes input power uninterrupted, can ensure that vehicle has good acceleration and higher average speed, the wearing and tearing of motor be reduced, extends interval mileage of major repair, improve bus dispatching rate, be conducive to boosting productivity.
In addition, the present invention is a kind of compound stepless speed variator that also can be used for various surface car, boats and ships, railway locomotive, engineering machinery, various space flight, aircraft, metallurgy, mine, oil, chemical industry, light industry, food, weaving, handling machinery, lathe, robot and military project.
Accompanying drawing explanation
Fig. 1 is the structural drawing of the embodiment of the present invention.
Embodiment
Below in conjunction with accompanying drawing and embodiment, the present invention is described in further detail:
Embodiment:
As shown in fig. 1, a kind of compound stepless speed variator, comprise input shaft 1, output shaft 4, output gear wheel set 5, gear 6, torque-controllable device 7, fixing overrunning clutch 8, input gear pair 9, overrunning clutch 10, the square that converges inputs torque-controllable device 11, remittance square input gear pair 12, the input end 81 of described fixing overrunning clutch 8 connects with the fixed element beyond the present invention, the remittance square input element 21 of remittance square unit 2 and the output terminal 102 of overrunning clutch 10 connect with input shaft 1, the remittance square output element 23 of square unit 2 that converges connects with a point square input element 31 for first point of square unit 3, point square input element 31 of all the other each point of square unit 3 connects output element 34 with point square going up a point of square unit 3 separately and connects, point square of last point of square unit 3 connects output element 34 and connects with the input gear 51 of the element beyond the present invention and output gear wheel set 5, the output gear 52 of output gear wheel set 5 connects with the input end 61 of gear 6, the input end 111 that the output terminal 62 of gear 6 inputs torque-controllable device 11 with the input end 71 of torque-controllable device 7 and the square that converges connects, the output terminal 72 of torque-controllable device 7 and the output terminal 82 of fixing overrunning clutch 8 connect with the input gear 91 of input gear pair 9, the output gear 92 of input gear pair 9 connects with the remittance square back-flow component 24 of remittance square unit 2, the output terminal 112 that the square that converges inputs torque-controllable device 11 connects with the input gear 121 of remittance square input gear pair 12, the output gear 122 of remittance square input gear pair 12 connects with the input end 101 of overrunning clutch 10, a point square output element 33 for each point of square unit 3 connects with output shaft 4.
Described torque-controllable device 7, the square input torque-controllable device 11 that converges can select fluid coupling.
Described each needs to connect, and by the element of some other element separate, can adopt the method for hollow, through some other elements, connects with it.
It is two-way that point square input element 31 of first point of square unit 3 connects point square planetary pinion 32 on output element 34 the power dividing being delivered to this by point square of first point of square unit 3, one road flows into point square output element 33 of first point of square unit 3, another road connects output element 34 through point square of first point of square unit 3, be delivered to point square input element 31 of the second point of square unit 3 again, be two-way by the square planetary pinion 32 that divides connected with point square of the second point of square unit 3 on output element 34 the power dividing being delivered to this again, one road flows into point square output element 33 of the second point of square unit 3, point square that another road flows into the second point of square unit 3 connects output element 34.
Because the rotating speed relations of distribution of each element above-mentioned can change, change according to rotating speed distribution between the two changes by two-way poower flow, when point square output element 33 of first point of square unit 3, when the rotating speed of point square output element 33 of the second point of square unit 3 is zero, its output power is zero, but moment is non-vanishing, now, point square output element 33 of first point of square unit 3, the input power of point square output element 33 of the second point of square unit 3 then changes to maximum value by certain value, described certain value refers to point square output element 33 when first point of square unit 3, point square output element 33 of the second point of square unit 3 connects output element 34 with a point square for the first point of square unit 3 coordinated separately, when the rotating speed of point square connection output element 34 of the second point of square unit 3 is identical, both press the value that planet row torque ratio distributes input power gained, described maximum value refers to point square input element 31 by first point of square unit 3, the total output of point square input element 31 input of the second point of square unit 3, that is, when two-way power changes, be delivered to point square output element 33 of first point of square unit 3, the moment on square output element 33 and output shaft 4 of dividing of second point of square unit 3 also changes thereupon.
The effect of overrunning clutch 10, remittance square input torque-controllable device 11, remittance square input gear pair 12 is that power is flowed into the remittance square input element 21 of power to remittance square unit 2, makes the remittance square input element 21 of remittance square unit 2 increase with the power of the remittance square back-flow component 24 of remittance square unit 2 and to increase.
The input power of motor is through input shaft 1, again through the remittance square input element 21 of remittance square unit 2, and by the remittance square planetary pinion 22 on the remittance square back-flow component 24 of remittance square unit 2 the remittance square output element 23 of power transimission to remittance square unit 2, be delivered to point square input element 31 of first point of square unit 3 again, and to connect point square planetary pinion 32 on output element 34 power dividing by point square of first point of square unit 3 be two-way, one road flows into point square output element 33 of first point of square unit 3, point square that another road flows into first point of square unit 3 connects output element 34, be delivered to point square input element 31 of the second point of square unit 3 again, connecting point square planetary pinion 32 on output element 34 power dividing by point square of the second point of square unit 3 is again two-way, one road flows into point square output element 33 of the second point of square unit 3, point square that another road flows into the second point of square unit 3 connects output element 34, point square of the second point of square unit 3 connects output element 34 and power is split into two-way again, one road flows into other element work done, another road flows into the input gear 51 of input gear pair 5, the input end 61 of gear 6 is delivered to again by the output gear 52 of input gear pair 5, be two-way through the output terminal 62 of gear 6 power dividing again, one road flows into the input end 71 of fluid coupling 7, output terminal 72 through fluid coupling 7 flows into the input gear 91 of input gear pair 9, the output gear 92 of input gear pair 9 is again the remittance square back-flow component 24 of power transimission to remittance square unit 2, another road flows into the input end 111 of fluid coupling 11, connected by the input gear 121 of the output terminal 112 inflow remittance square input gear pair 12 of fluid coupling 11 again, the output gear 122 of remittance square input gear pair 12 is the input end 101 of power transimission to overrunning clutch 10, input shaft 1 is delivered to again by the output terminal 102 of overrunning clutch 10, the power flow concentration of input shaft 1 is flowed into motor, this road power and through fluid coupling 7 and input gear pair 9 again power transimission to converging the power of remittance square back-flow component 24 of square unit 2, the remittance square output element 23 of remittance square unit 2 is then all delivered to by the remittance square planetary pinion 22 converged on the remittance square back-flow component 24 of square unit 2, the remittance square output element 23 of remittance square unit 2 repeats said process again, make point square output element 33 being delivered to first point of square unit 3, the power of the moment on point square output element 33 of the second point of square unit 3 constantly increases, and be passed to output shaft 4 of the present invention, thus achieve the power of motor is externally exported by output shaft 4.
For the present invention, when the rotating speed of input shaft 1 is constant, the moment of torsion on square output element 33 and output shaft 4 that divides of point square output element 33, second point of square unit 3 of first point of square unit 3 changes with the change of its rotating speed, rotating speed is lower, the moment of torsion be delivered on the remittance square back-flow component 24 of remittance square unit 2, first point of square output element 33, second point of square output element 33 and output shaft 4 is larger, otherwise, then less, thus realize the present invention can change moment and speed compound stepless speed variator with the difference of vehicle travel resistance.
When the present invention uses, if the input power of motor, input speed and load constant, namely the rotating speed of input shaft 1 and moment of torsion are constant, before vehicle starting, the rotating speed of output shaft 4 is zero, work as automobile starting, the input power of motor is through input shaft 1, be delivered to the remittance square input element 21 of remittance square unit 2, wherein, due to the remittance square back-flow component 24 now not having power to flow into remittance square unit 2, and converge the remittance square back-flow component 24 of square unit 2 and fixing overrunning clutch 8 output terminal 82 and connect with the output gear 92 of input gear pair 9 and the input gear 91 of input gear pair 9 respectively, and the input end 81 of fixing overrunning clutch 8 connects with fixed element, play restriction to turn to, what make that the remittance square back-flow component 24 of remittance square unit 2 can not be contrary with motor turns to rotation, rotating speed is zero, now, be delivered to the power of the remittance square input element 21 of remittance square unit 2, the remittance square planetary pinion 22 then passing through to converge on the remittance square back-flow component 24 of square unit 2 is the remittance square output element 23 of power transimission to remittance square unit 2, be delivered to point square input element 31 of point square unit 3 again, and to connect point square planetary pinion 32 on output element 34 power dividing by point square of first point of square unit 3 be two-way, one road flows into point square output element 33 of first point of square unit 3, point square that another road flows into first point of square unit 3 connects output element 34, be delivered to point square input element 31 of the second point of square unit 3 again, connecting point square planetary pinion 32 on output element 34 power dividing by point square of the second point of square unit 3 is again two-way, one road flows into point square output element 33 of the second point of square unit 3, point square that another road flows into the second point of square unit 3 connects output element 34, point square of the second point of square unit 3 connects output element 34 and power is split into two-way again, one road flows into other element work done, another road flows into the input gear 51 of input gear pair 5, the input end 61 of gear 6 is delivered to again by the output gear 52 of input gear pair 5, be two-way through the output terminal 62 of gear 6 power dividing again, one road flows into the input end 71 of fluid coupling 7, output terminal 72 through fluid coupling 7 flows into the input gear 91 of input gear pair 9, the output gear 92 of input gear pair 9 is again the remittance square back-flow component 24 of power transimission to remittance square unit 2, another road flows into the input end 111 of remittance square input torque-controllable device 11, connected by the input gear 121 of the output terminal 112 inflow remittance square input gear pair 12 of remittance square input torque-controllable device 11 again, the output gear 122 of remittance square input gear pair 12 is the input end 101 of power transimission to overrunning clutch 10, input shaft 1 is delivered to again by the output terminal 102 of overrunning clutch 10, the power flow concentration of input shaft 1 is flowed into motor, this road power and through fluid coupling 7 and input gear pair 9 again power transimission to converging the power of remittance square back-flow component 24 of square unit 2, the remittance square output element 23 of remittance square unit 2 is then all delivered to by the remittance square planetary pinion 22 converged on the remittance square back-flow component 24 of square unit 2, the remittance square output element 23 of remittance square unit 2 repeats said process again, constantly a point square is carried out between each element, the iterative cycles of bending moment and remittance square, make point square output element 33 being delivered to first point of square unit 3, the power of the moment on point square output element 33 of the second point of square unit 3 constantly increases, and be passed to output shaft 4 of the present invention, when being delivered to the moment of torsion on output shaft 4, through power train be transferred to the tractive force that driving wheel produces be enough to overcome vehicle starting resistance time, automobile is then started to walk and is started to accelerate, point square output element 33 of the first point of square unit 3 be connected with it, point square output element 33 of the second point of square unit 3 and the rotating speed of output shaft 4 also increase gradually from zero, now, the power flowing into the remittance square back-flow component 24 of remittance square unit 2 reduces gradually, thus the moment of torsion of output shaft 4 is reduced along with the increase of rotating speed.
Claims (1)
1. a compound stepless speed variator, comprise input shaft (1), output shaft (4), output gear wheel set (5), gear (6), torque-controllable device (7), fixing overrunning clutch (8), input gear pair (9), overrunning clutch (10), the square that converges inputs torque-controllable device (11), remittance square input gear pair (12), the input end (81) of described fixing overrunning clutch (8) connects with fixed element, it is characterized in that: be provided with several between described input shaft (1) and output shaft (4) and converge square unit (2) and point square unit (3), described remittance square unit (2) comprises remittance square input element (21), remittance square planetary pinion (22), remittance square output element (23), remittance square back-flow component (24), square unit (3) is divided to comprise a point square input element (31), divide square planetary pinion (32), divide square output element (33), square is divided to connect output element (34), each remittance square unit (2) and point square unit (3) are coupled to each other by the element coordinated separately, the remittance square input element (21) of remittance square unit (2) and the output terminal (102) of overrunning clutch (10) connect with input shaft (1), the remittance square output element (23) of square unit (2) that converges connects with a point square input element (31) for first point of square unit (3), point square input element (31) of all the other each point of square unit (3) connects output element (34) with point square going up a point of square unit (3) separately and connects, point square of last point of square unit (3) connects output element (34) and connects with the input gear (51) of other element and output gear wheel set (5), the output gear (52) of output gear wheel set (5) connects with the input end (61) of gear (6), the input end (111) that the output terminal (62) of gear (6) inputs torque-controllable device (11) with the input end (71) of torque-controllable device (7) and the square that converges connects, the output terminal (72) of torque-controllable device (7) and the output terminal (82) of fixing overrunning clutch (8) connect with the input gear (91) of input gear pair (9), the output gear (92) of input gear pair (9) connects with the remittance square back-flow component (24) of remittance square unit (2), the output terminal (112) that the square that converges inputs torque-controllable device (11) connects with the input gear (121) of remittance square input gear pair (12), the output gear (122) of remittance square input gear pair (12) connects with the input end (101) of overrunning clutch (10), a point square output element (33) for each point of square unit (3) connects with output shaft (4).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510059191.3A CN104595437A (en) | 2010-07-07 | 2010-07-07 | Composite continuously-variable transmission |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510059191.3A CN104595437A (en) | 2010-07-07 | 2010-07-07 | Composite continuously-variable transmission |
Related Parent Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201010219853.6A Division CN102312967B (en) | 2010-07-07 | 2010-07-07 | Continuously variable transmission |
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| Publication Number | Publication Date |
|---|---|
| CN104595437A true CN104595437A (en) | 2015-05-06 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201510059191.3A Pending CN104595437A (en) | 2010-07-07 | 2010-07-07 | Composite continuously-variable transmission |
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| CN (1) | CN104595437A (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN104976303A (en) * | 2015-07-07 | 2015-10-14 | 吴志强 | Compound box type hydraulic coupler and starter |
| CN107763155A (en) * | 2016-08-16 | 2018-03-06 | 钟跃荣 | A kind of the mechanical stepless speed changes method and stepless speed changing mechanism of double-planet mechanism composition |
| CN107850199A (en) * | 2015-07-07 | 2018-03-27 | 吴志强 | A kind of buncher |
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| US20040242357A1 (en) * | 2003-05-27 | 2004-12-02 | Komatsu Ltd. | Hydromechanical transmission |
| JP2005048940A (en) * | 2003-07-29 | 2005-02-24 | Makoto Nagayoshi | Continuously variable transmission |
| CN1773142A (en) * | 2005-04-01 | 2006-05-17 | 杨国辉 | Speed feedback stepless speed changer |
| CN101235877A (en) * | 2007-02-02 | 2008-08-06 | 吴志强 | Stepless speed variator |
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| US20030134707A1 (en) * | 2001-11-08 | 2003-07-17 | Goldie James H. | Continuously variable transmissions using magnetorheological fluid or oil shear and methods of and systems for using the same in a vehicle, in-wheel application |
| US20040242357A1 (en) * | 2003-05-27 | 2004-12-02 | Komatsu Ltd. | Hydromechanical transmission |
| JP2005048940A (en) * | 2003-07-29 | 2005-02-24 | Makoto Nagayoshi | Continuously variable transmission |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN104976303A (en) * | 2015-07-07 | 2015-10-14 | 吴志强 | Compound box type hydraulic coupler and starter |
| CN104976303B (en) * | 2015-07-07 | 2017-10-03 | 广州市无级制动科技有限责任公司 | A kind of composite box type hydraulic coupler |
| CN107850199A (en) * | 2015-07-07 | 2018-03-27 | 吴志强 | A kind of buncher |
| CN107850199B (en) * | 2015-07-07 | 2023-09-29 | 深圳市踢踢电子有限公司 | Continuously variable transmission |
| CN107763155A (en) * | 2016-08-16 | 2018-03-06 | 钟跃荣 | A kind of the mechanical stepless speed changes method and stepless speed changing mechanism of double-planet mechanism composition |
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Application publication date: 20150506 |