CN206361099U - A kind of fixed Two-wheeled third gear fully-automatic gearbox of centre wheel gear ring - Google Patents

Abstract

The utility model discloses a kind of fixed Two-wheeled third gear fully-automatic gearbox of centre wheel gear ring, including：Power input, central shaft, ratchet sleeve and gear, the gear include：Two sets of automatic centrifugation shifters and two sets of planetary transmissions, the planetary transmission includes the first planetary transmission and the second planetary transmission, the automatic centrifugation shifter includes the first automatic centrifugation shifter and the second automatic centrifugation shifter, and the first automatic centrifugation shifter includes：First pallet piece frame, the first ratchet and at least one first pallet piece, first pallet piece sets up and is placed on the first planet carrier, first ratchet is arranged in ratchet sleeve, the structure of the second automatic centrifugation shifter is identical with the structure of the first automatic centrifugation shifter, speed changer in other the utility model can be reduced to stepping on the requirement of frequency when medium-to-high grade, so that it is lighter to ride.

Description

A kind of fixed Two-wheeled third gear fully-automatic gearbox of centre wheel gear ring

【Technical field】

The utility model is related to technical field of bicycles, and in particular to a kind of fixed Two-wheeled third gear of centre wheel gear ring Fully-automatic gearbox.

【Background technology】

Bicycle speed-varying unit is divided into two kinds of internal speed changer and outer speed changer, outer speed changer be use open link chain mechanism for Transmission system, transforms to chain by stirring the selector being installed in front of bicycle and different chains is realized on different flywheels Bar gearratio, because outer speed changer is exposed outside, therefore is easier to get rusty, and is easily disturbed by external force, so through Often periodic maintenance is needed to maintain, internal speed changer mainly using planetary gears as transmission main body, is sealed in ratchet sleeve Portion, by multilayer special seal material protection, so rainwater, dust, grease etc. cannot be introduced into, therefore without time-based maintenance, is realized Exempt from the advantage of maintenance.The existing following defect of internal speed changer generally existing in the art：1st, hand shift is needed, it is impossible to realize certainly Move shelves；2nd, when internal speed changer is shifted to top gear, if stepping on frequency in reduction, then speed changer is difficult to hold in top gear.

Therefore, it is necessary to which it is complete certainly to provide a kind of fixed Two-wheeled third gear of centre wheel gear ring for solving above-mentioned technical problem Dynamic speed changer.

【Utility model content】

To solve the above problems, the purpose of this utility model is to provide a kind of reduce to stepping on the center gear teeth that frequency is required Enclose fixed Two-wheeled third gear fully-automatic gearbox.

To achieve the above object, the technical scheme that the utility model is taken is：A kind of fixed two-wheel of centre wheel gear ring drives Dynamic third gear fully-automatic gearbox, including：Power input, central shaft, ratchet sleeve and it is arranged between central shaft and ratchet sleeve Gear, the power input is installed on ratchet sleeve, and the gear includes：Two sets of automatic centrifugation shifters and Two sets of planetary transmissions for being arranged side by side, the planetary transmission includes the first planetary transmission and the second planetary transmission, institute Stating the first planetary transmission includes：First gear ring, the first centre wheel, the first planet carrier and the first planetary gear, first center Wheel is sheathed on central shaft and is fixedly connected with vehicle frame, and second planetary transmission includes：Second gear ring, the second centre wheel, Second planet carrier and the second planetary gear, second centre wheel are sheathed on central shaft, second centre wheel and the first gear ring Form a sub-assembly, second gear ring is fixedly connected with vehicle frame, and second planet carrier is fixedly connected with central shaft, it is described from Dynamic centrifugation shifter includes the first automatic centrifugation shifter and the second automatic centrifugation shifter, first automatic centrifugation Shifter includes：First pallet piece frame, the first ratchet and at least one first pallet piece, first pallet piece set up and are placed in On first planet carrier, first ratchet is arranged in ratchet sleeve, and first pallet piece is installed on the first pallet piece frame, institute Stating the second automatic centrifugation shifter includes：Second pallet piece frame, the second ratchet and at least one second pallet piece, described second Pallet piece is set up and is placed on the second planet carrier, and second ratchet is arranged in ratchet sleeve, and second pallet piece is installed on the On two pallet piece framves, freewheel clutch is provided between the sub-assembly and ratchet sleeve.

Preferably, the fixed Two-wheeled third gear fully-automatic gearbox of a kind of centre wheel gear ring in the utility model enters one Step is set to：The first automatic centrifugation gearshift also includes at least one first STATEMENT OF FEDERALLY SPONSORED, and first pallet piece passes through First connector is installed on the first pallet piece frame, and first STATEMENT OF FEDERALLY SPONSORED is installed on the first pallet piece frame by the second connector On, first pallet piece and the first STATEMENT OF FEDERALLY SPONSORED are set in distance in a circumferential direction, and first pallet piece includes first end Portion, the second end and the first installation portion being arranged between first end and the second end, the of at least one the first pallet piece Provided with the ratchet portion being engaged with ratchet at the outer wall of two ends, the first installation portion of first pallet piece, which is provided with, to be used to install First mounting hole of the first connector, first STATEMENT OF FEDERALLY SPONSORED include the 3rd end, the 4th end and be arranged at the 3rd end with The second installation portion between 4th end, the second installation portion of first STATEMENT OF FEDERALLY SPONSORED, which is provided with, is used to installing the of the second connector Two mounting holes, the second end of first pallet piece and/or the 3rd end of the first STATEMENT OF FEDERALLY SPONSORED are provided with balancing weight, described first Elasticity for controlling the first pallet piece initial position is installed on pallet piece frame or in the first STATEMENT OF FEDERALLY SPONSORED or on the first pallet piece Part, the inner side of the first pallet piece the second end is limited in, along radius side along the 3rd end of the first STATEMENT OF FEDERALLY SPONSORED described in radial direction The inner side of the first pallet piece first end is limited in the 4th end of first STATEMENT OF FEDERALLY SPONSORED or along described in radial direction first The first end of pallet piece is limited in the inner side of the 4th end of the first STATEMENT OF FEDERALLY SPONSORED, the second end limit of first pallet piece Inner side positioned at the end of the first STATEMENT OF FEDERALLY SPONSORED the 3rd, the structure of the second automatic centrifugation shifter and the first automatic centrifugation gear shift The structure of mechanism is identical.

Preferably, the fixed Two-wheeled third gear fully-automatic gearbox of a kind of centre wheel gear ring in the utility model enters one Step is set to：The first automatic centrifugation gearshift also includes at least one first STATEMENT OF FEDERALLY SPONSORED, and first pallet piece passes through First connector is installed on the first pallet piece frame, one end and the pallet piece of one of them adjacent first of first STATEMENT OF FEDERALLY SPONSORED It is flexibly connected, the other end of first STATEMENT OF FEDERALLY SPONSORED is flexibly connected with the pallet piece of another adjacent first, first spine Bluff piece and the first STATEMENT OF FEDERALLY SPONSORED are set in distance in a circumferential direction, first pallet piece include first end, the second end and The first installation portion between first end and the second end is arranged at, first installation portion, which is provided with, to be used to install the first connector The first mounting hole, the second end of first pallet piece is provided with balancing weight, the second end of at least one the first pallet piece Outer wall at provided with the ratchet portion that is engaged with ratchet, on the first pallet piece frame or in the first STATEMENT OF FEDERALLY SPONSORED or the first pallet piece On elastic component for controlling the first pallet piece initial position, the structure of the second automatic centrifugation shifter and the are installed The structure of one automatic centrifugation shifter is identical.

Preferably, the fixed Two-wheeled third gear fully-automatic gearbox of a kind of centre wheel gear ring in the utility model enters one Step is set to：The first pallet piece frame includes：Several peaces that the outer wall of circular base portion and certainly circular base portion stretches out Fill seat.

Preferably, the fixed Two-wheeled third gear fully-automatic gearbox of a kind of centre wheel gear ring in the utility model enters one Step is set to：The elastic component is torsion spring, spring or spring leaf.

Preferably, the fixed Two-wheeled third gear fully-automatic gearbox of a kind of centre wheel gear ring in the utility model enters one Step is set to：First connector and the second connector are pin.

Preferably, the fixed Two-wheeled third gear fully-automatic gearbox of a kind of centre wheel gear ring in the utility model enters one Step is set to：The mating surface of first pallet piece and the first STATEMENT OF FEDERALLY SPONSORED is set in involute shape or arc shaped.

Preferably, the fixed Two-wheeled third gear fully-automatic gearbox of a kind of centre wheel gear ring in the utility model enters one Step is set to：One end of the central shaft is provided with boss, the other end of the central shaft provided with and tight part, second gear ring with Connected, connected between second gear ring and boss by bearing or ball by bearing or ball between ratchet sleeve, described the Connected between one centre wheel and ratchet sleeve by bearing or ball, bearing or rolling are passed through between first centre wheel and simultaneously tight part Pearl connects.

Preferably, the fixed Two-wheeled third gear fully-automatic gearbox of a kind of centre wheel gear ring in the utility model enters one Step is set to：Freewheel clutch is provided between the power input and ratchet sleeve.

Compared with prior art, the utility model has the advantages that：Centre wheel gear ring in the utility model is consolidated Fixed pattern Two-wheeled third gear fully-automatic gearbox compact conformation, easy for installation, transmission efficiency, gear shift are firm, speed change is stable, lead to Two sets of automatic centrifugation shifters of setting are crossed in speed changer, so that full-automatic three class gear shift can be realized, the utility model in addition In speed changer can reduce to stepping on the requirement of frequency when medium-to-high grade so that it is lighter to ride.

【Brief description of the drawings】

Fig. 1 is the main structure diagram of third gear fully-automatic gearbox in the utility model embodiment 1.

Fig. 2 is the decomposition texture schematic diagram of third gear fully-automatic gearbox in the utility model embodiment 1.

Fig. 3 is the cross section structure diagram along line A-A shown in Fig. 1.

Fig. 4 is the structural representation of the first automatic centrifugation shifter.

Fig. 1 is into Fig. 4：1st, power input, 2, central shaft, 20, boss, 3, ratchet sleeve, 4, automatic centrifugation shifter, 40th, the first automatic centrifugation shifter, the 400, first pallet piece frame, 4000, elastic component, the 401, first pallet piece, 4010, first End, 4011, the second end, the 4012, first installation portion, 4013, ratchet portion, the 402, first STATEMENT OF FEDERALLY SPONSORED, the 4020, the 3rd end, 4021st, the 4th end, the 4022, second installation portion, the 403, first ratchet, the 41, second automatic centrifugation shifter, the 410, second spine Bluff piece frame, the 411, second pallet piece, the 412, second STATEMENT OF FEDERALLY SPONSORED, the 413, second ratchet, 5, planetary transmission, the 50, first planet becomes Fast device, the 500, first gear ring, the 501, first centre wheel, the 502, first planet carrier, the 503, first planetary gear, the 51, second planet becomes Fast device, the 510, second gear ring, the 511, second centre wheel, the 512, second planet carrier, the 513, second planetary gear, 6, freewheel clutch, 60th, ratchet, 61, ratchet, 7 and tight part.

【Embodiment】

Below by specific embodiment to a kind of fixed Two-wheeled third gear of centre wheel gear ring described in the utility model Fully-automatic gearbox is described in further detail.

Embodiment 1

Join shown in Fig. 1 to Fig. 4, the fixed Two-wheeled third gear fully-automatic gearbox of centre wheel gear ring in the utility model Including：Power input 1, central shaft 2, ratchet sleeve 3 and the gear being arranged between ratchet sleeve 3 and central shaft 2, it is described dynamic Power input component 1 is fixedly connected with ratchet sleeve 3, certainly in other implementations, the power input 1 and ratchet sleeve 3 it Between may also set up freewheel clutch, so as to ensure that ratchet sleeve 3 is constantly in rotation status.The gear includes two sets automatically Centrifuge shifter 4 and two sets of planetary transmissions 5.

The planetary transmission 5 includes the first planetary transmission 50, the second planetary transmission set gradually from right to left 51, first planetary transmission 50 includes the first gear ring 500, the first centre wheel 501, the first planet carrier 502 and the first planet Wheel 503, first centre wheel 501 is sheathed on central shaft 2 and is fixedly connected with vehicle frame, and second planetary transmission 51 is wrapped Include the second gear ring 510, the second centre wheel 511, the second planet carrier 512 and the second planetary gear 513, second centre wheel 511 with First gear ring 500 is integrally formed, and second gear ring 510 is fixedly connected with vehicle frame, second planet carrier 512 and central shaft 2 Between achieved a fixed connection by spline.

The automatic centrifugation shifter 4 includes the first automatic centrifugation shifter 40, the second automatic centrifugation shifter 41, the first automatic centrifugation shifter 40 includes：First pallet piece frame 400, three the first pallet pieces 401, three first The ratchet 403 of STATEMENT OF FEDERALLY SPONSORED 402 and first, the first pallet piece frame 400 includes：Circular base portion and the outer wall from circular base portion The several mounting seats stretched out, the pallet piece 401 of the first STATEMENT OF FEDERALLY SPONSORED 402 and first is respectively arranged in mounting seat.Certainly In other embodiments, it is not provided with STATEMENT OF FEDERALLY SPONSORED 402 or a STATEMENT OF FEDERALLY SPONSORED 402 is only set or a pallet piece 401 is only set, together Sample can realize the utility model.The first pallet piece frame 400 is integrally formed with the first planet carrier 502, first ratchet 403 are arranged at the right end position of the inwall of ratchet sleeve 3 and are integrally formed with ratchet sleeve 3, and first pallet piece 401 is pacified by pin Loaded on the first pallet piece frame 400, first STATEMENT OF FEDERALLY SPONSORED 402 is installed on the first pallet piece frame 400 by pin, described three First pallet piece 401 and three the first STATEMENT OF FEDERALLY SPONSOREDs 402 are set in distance in a circumferential direction, and first pallet piece 401 includes First end 4010, the second end 4011 and the first installation portion being arranged between first end 4010 and the second end 4011 4012, the first installation portion 4012 of first pallet piece 401 is provided with the first mounting hole for mounting pin, in present embodiment In, the ratchet portion being engaged with the first ratchet 403 is equipped with the outer wall of the second end 4011 of each first pallet piece 401 4013, certainly in other embodiments, can also the first pallet piece of only one of which 401 the second end 4011 outer wall at set Have a ratchet portion 4013 being engaged with the first ratchet 403, or only two the first pallet pieces 401 the second end 4011 it is outer Provided with the ratchet portion 4013 being engaged with the first ratchet 403 at wall, the utility model can be equally realized.First STATEMENT OF FEDERALLY SPONSORED 402 include the 3rd end 4020, the 4th end 4021 and be arranged between the 3rd end 4020 and the 4th end 4021 second Installation portion 4022, the second installation portion 4022 of first STATEMENT OF FEDERALLY SPONSORED 402 is provided with the second mounting hole for mounting pin, and described the 3rd end 4020 of the STATEMENT OF FEDERALLY SPONSORED 402 of the second end 4011 and first of one pallet piece 401 is provided with balancing weight, along radial direction institute The 3rd end 4020 for stating the first STATEMENT OF FEDERALLY SPONSORED 402 is limited in the inner side of the second end 4011 of the first pallet piece 401, along radial direction 4th end 4021 of first STATEMENT OF FEDERALLY SPONSORED 402 is limited in the inner side of the first end 4010 of the first pallet piece 401, so sets It is advantageous in that not only pallet piece can produce centrifugal force, STATEMENT OF FEDERALLY SPONSORED can also produce centrifugal force, so as to substantially increase centrifugal mechanism Centrifugal force so that the more miniaturization that whole centrifugal mechanism can be set, while the centrifugal mechanism of this kind of structure can be set More centrifugal ratchet quantity, so that stability is higher during whole centrifugal mechanism work.Pacify on the first pallet piece frame 400 Equipped with the elastic component 4000 for controlling the initial position of the first pallet piece 401, the elastic component can be torsion spring, spring or spring Piece, certainly in other implementations, the elastic component 4000 may be mounted on the first pallet piece 401 or the first STATEMENT OF FEDERALLY SPONSORED On 402, the utility model can be equally realized.The mating surface of the STATEMENT OF FEDERALLY SPONSORED 402 of first pallet piece 401 and first is in involute Shape or arc shaped are set, and are so set and are advantageous in that：Can keep the swing angle of pallet piece and the swing angle of STATEMENT OF FEDERALLY SPONSORED Unanimously.The second automatic centrifugation shifter 41 includes：Second pallet piece frame 410, several second pallet pieces 411, Shuo Ge Two STATEMENT OF FEDERALLY SPONSOREDs 412 and the second ratchet 413, the second pallet piece frame 410 are fixedly connected with the second planet carrier 512, and described second Ratchet 413 is arranged in ratchet sleeve 3 and is integrally formed with ratchet sleeve 3, the structure of the second automatic centrifugation shifter 41 with The structure of first automatic centrifugation shifter 40 is identical.Certainly in other implementations, automatic centrifugation gearshift also may be used To be such structure, one end of the STATEMENT OF FEDERALLY SPONSORED is flexibly connected with adjacent one of pallet piece, the STATEMENT OF FEDERALLY SPONSORED it is another One end is flexibly connected with another adjacent pallet piece, i.e., STATEMENT OF FEDERALLY SPONSORED can be adjacent with two respectively by way of the bending of two ends Pallet piece constitute be flexibly connected or STATEMENT OF FEDERALLY SPONSORED directly by pin it is adjacent with two pallet piece composition be flexibly connected, now join Moving part plays linkage equivalent to balancing pull rod, can equally realize the utility model.

Freewheel clutch 6 is provided between the inwall of first gear ring 500 and ratchet sleeve 3, the freewheel clutch 6 is wrapped Include：Ratchet 60 and ratchet 61, in the present embodiment, the ratchet 60 are arranged on the first gear ring 500, and ratchet 61 is arranged at spine In wheel case 3, certainly in other implementations, the ratchet 60 may also set up in ratchet sleeve 3, ratchet 61 may also set up in On first gear ring 500, the utility model can be equally realized.

One end of the central shaft 2 is provided with boss 20, and the other end of the central shaft 2 is provided with simultaneously tight part 7, second tooth Connected between circle 510 and ratchet sleeve 3 by bearing or ball, bearing or rolling are passed through between second gear ring 510 and boss 20 Pearl connects, and is connected between first centre wheel 501 and ratchet sleeve 3 by bearing or ball, first centre wheel 501 with simultaneously Connected between tight part 7 by bearing or ball.

The operation principle of speed changer is in the present embodiment：The ratchet 60 of the freewheel clutch 6 is normally open, i.e., first Gear ring 500 remains that the speed changer in engagement, the present embodiment realizes three class gear shift altogether with ratchet sleeve 3, during low or first gear, moves Power is inputted by power input 1, because power input 1 is integrally formed with ratchet sleeve 3, ratchet sleeve 3 again with the phase of the first gear ring 500 Engagement, therefore power is transferred to the first gear ring 500, because the first gear ring 500 is integrally formed with the second centre wheel 511, thus it is dynamic Power is transferred to the second centre wheel 511, by the transmission of the second planetary gear 513, and the second centre wheel 511 delivers power to the second row Carrier 512, because the second planet carrier 512 is fixedly connected with central shaft 2, because power is finally transferred to central shaft 2 and by center Axle 2 carries out power output.With the lifting of the speed of power input 1, the first pallet piece in the first automatic centrifugation shifter 40 401 balancing weight produces centrifugal force and moved along the direction away from axle center, because ratchet portion and the balancing weight of the first pallet piece 401 are pacified Loaded on same one end, therefore, ratchet portion is also moved along the direction away from axle center, so as to mutually be nibbled with the first ratchet 403 in ratchet sleeve 3 Close, when the first pallet piece 401 is meshed with ratchet sleeve 3, the freewheel clutch 6 is servo-actuated state, and power is by power input 1 Input, because power input 1 is integrally formed with ratchet sleeve 3, ratchet sleeve is meshed with the first pallet piece 401, the first pallet piece 401 are installed on the first pallet piece frame 400, and the first pallet piece frame 400 is integrally formed with the first planet carrier 502 again, therefore power The first planet carrier 502 is transferred to, by the transmission of the first planetary gear 503, the first planet carrier 502 delivers power to the first gear ring 500, because the first gear ring 500 is integrally formed with the second centre wheel 511, therefore power is transferred to the second centre wheel 511, passes through The transmission of two planetary gears 513, the second centre wheel 511 delivers power to the second planet carrier 512, due to the second planet carrier 512 with Central shaft 2 is integrally formed, therefore, and power is finally transferred to central shaft 2 and carries out power output by central shaft 2, so that in realizing Fast shelves, when the speed of power input 1 is lifted again, the counterweight of the second pallet piece 411 in the second automatic centrifugation shifter 41 Block end produces centrifugal force and moved along the direction away from axle center, because ratchet portion and the balancing weight of the second pallet piece 411 are installed on together One end, therefore, ratchet portion are also moved along the direction away from axle center, so that be meshed with the second ratchet 413 in ratchet sleeve 3, the When two pallet pieces 411 are meshed with ratchet sleeve 3, the automatic centrifugation shifter 40 of freewheel clutch 6 and first is servo-actuated shape State, power is inputted by power input 1, because power input 1 is integrally formed with ratchet sleeve 3, the pallet piece of ratchet sleeve 3 and second 411 are meshed, and the second pallet piece 411 is installed on the second pallet piece frame 410, the second pallet piece frame 410 again with the second planet carrier 512 are integrally formed, therefore power is transferred to the second planet carrier 512, because the second planet carrier 512 is fixedly connected with central shaft, because This power is finally transferred to central shaft and carries out power output by central shaft.Realize the speed changer in top gear, the utility model The requirement to stepping on frequency can be reduced, for example：Assuming that the slowest ratio in the present embodiment is set into 3:1, top gear and middling speed notch speed Than for 2:1, mid ranger is 1.5 with low speed notch speed ratio:1, the working speed that the ratchet of the first automatic centrifugation mechanism is opened is 160 Rev/min, the working speed that the ratchet of the second automatic centrifugation mechanism is opened is 120 revs/min, then work as input component during low or first gear When input speed is 150 revs/min, the speed of the first automatic centrifugation ratchet and the second automatic centrifugation ratchet is respectively 100 revs/min Clock, 50 revs/min of kinds, be respectively less than the working speed that the ratchet of respective automatic centrifugation mechanism is opened, the ratchet of automatic centrifugation mechanism without Method is opened, and now output speed is 50 revs/min.When the input speed of input component mentions 240 revs/min, first it is automatic from The speed of heart ratchet and the second automatic centrifugation ratchet is respectively 160 revs/min, 80 revs/min of kinds, now the first automatic centrifugation ratchet Open, the second automatic centrifugation ratchet realizes mid ranger still in closed mode, output speed now is 80 revs/min.Now Ratchet of the input component directly with the first automatic centrifugation mechanism engage, 240 revs/min of the input speed of input component, much larger than 160 revs/min of the working speed that the ratchet of one automatic centrifugation mechanism is opened, it is possible to reduce the input speed of input component, It can exactly reduce and trample frequency.The first automatic centrifugation mechanism ratchet open working condition under, when input speed again Bring up to 240 revs/min, the speed of the first automatic centrifugation ratchet and the second automatic centrifugation ratchet is respectively 240 revs/min, 120 revs/min of kinds, now the second automatic centrifugation ratchet open, the first automatic centrifugation ratchet is realized at a high speed still in open mode Shelves.Output speed now is 120 revs/min.Ratchet of the input component now directly with the second automatic centrifugation mechanism is engaged, defeated Enter 240 revs/min of the input speed of part, much larger than 120 revs/min of the working speed of the ratchet opening of the second automatic centrifugation mechanism Clock, it is possible to reduce the input speed of input component, that is, it can reduce and trample frequency.Input turn is improved by a series of Speed, realizes automatic centrifugation gear shift, and reduction tramples frequency, input speed is improved again, higher level automatic centrifugation gear shift is realized again This automatic centrifugation gear shift is circulated.

The fixed Two-wheeled third gear fully-automatic gearbox compact conformation of centre wheel gear ring in the utility model, installation side Just, transmission efficiency, gear shift be firm, speed change is stable, by setting two sets of automatic centrifugation shifters in speed changer, so as to Full-automatic three class gear shift is realized, the speed changer in the utility model can reduce the requirement to stepping on frequency when medium-to-high grade in addition, so that So that it is lighter to ride.

Principle and its effect that the above embodiments only illustrative the utility model is created, and the reality that part is used Example is applied, not for limitation the utility model；It should be pointed out that for the person of ordinary skill of the art, not departing from this On the premise of utility model creates design, various modifications and improvements can be made, these belong to protection of the present utility model Scope.

Claims (9)

1. a kind of fixed Two-wheeled third gear fully-automatic gearbox of centre wheel gear ring, it is characterised in that including：Power is inputted Part, central shaft, ratchet sleeve and the gear being arranged between central shaft and ratchet sleeve, the power input are installed on ratchet Put, the gear includes：Two sets of automatic centrifugation shifters and two sets of planetary transmissions being arranged side by side, the planet Speed changer includes the first planetary transmission and the second planetary transmission, and first planetary transmission includes：First gear ring, first Centre wheel, the first planet carrier and the first planetary gear, first centre wheel are sheathed on central shaft and are fixedly connected with vehicle frame, institute Stating the second planetary transmission includes：Second gear ring, the second centre wheel, the second planet carrier and the second planetary gear, second center Wheel is sheathed on central shaft, and one sub-assembly of the second centre wheel and the first gear ring formation, second gear ring is fixed with vehicle frame Connection, second planet carrier is fixedly connected with central shaft, and the automatic centrifugation shifter includes the first automatic centrifugation gear shift Mechanism and the second automatic centrifugation shifter, the first automatic centrifugation shifter include：First pallet piece frame, the first ratchet And at least one first pallet piece, first pallet piece sets up and is placed on the first planet carrier, and first ratchet is arranged at spine In wheel case, first pallet piece is installed on the first pallet piece frame, and the second automatic centrifugation shifter includes：Second spine Bluff piece frame, the second ratchet and at least one second pallet piece, second pallet piece set up and are placed on the second planet carrier, and described the Two ratchets are arranged in ratchet sleeve, and second pallet piece is installed on the second pallet piece frame, the sub-assembly and ratchet sleeve it Between be provided with freewheel clutch.

2. a kind of fixed Two-wheeled third gear fully-automatic gearbox of centre wheel gear ring as claimed in claim 1, its feature exists In：The first automatic centrifugation gearshift also includes at least one first STATEMENT OF FEDERALLY SPONSORED, and first pallet piece connects by first Fitting is installed on the first pallet piece frame, and first STATEMENT OF FEDERALLY SPONSORED is installed on the first pallet piece frame by the second connector, institute State the first pallet piece and the first STATEMENT OF FEDERALLY SPONSORED is set in distance in a circumferential direction, first pallet piece includes first end, the Two ends and the first installation portion being arranged between first end and the second end, the second end of at least one the first pallet piece Outer wall at provided with the ratchet portion that is engaged with ratchet, the first installation portion of first pallet piece, which is provided with to be used to installing first, to be connected First mounting hole of fitting, first STATEMENT OF FEDERALLY SPONSORED includes the 3rd end, the 4th end and is arranged at the 3rd end and the 4th end The second installation portion between portion, the second installation portion of first STATEMENT OF FEDERALLY SPONSORED, which is provided with, is used for the second installation for installing the second connector Hole, the second end of first pallet piece and/or the 3rd end of the first STATEMENT OF FEDERALLY SPONSORED are provided with balancing weight, first pallet piece Elastic component for controlling the first pallet piece initial position is installed, along half on frame or in the first STATEMENT OF FEDERALLY SPONSORED or on the first pallet piece 3rd end of the first STATEMENT OF FEDERALLY SPONSORED described in the direction of footpath is limited in the inner side of the first pallet piece the second end, along described in radial direction 4th end of one STATEMENT OF FEDERALLY SPONSORED is limited in the inner side of the first pallet piece first end or along the first pallet piece described in radial direction First end is limited in the inner side of the 4th end of the first STATEMENT OF FEDERALLY SPONSORED, the second end of first pallet piece and is limited in first The inner side of the end of STATEMENT OF FEDERALLY SPONSORED the 3rd, the structure of the second automatic centrifugation shifter and the knot of the first automatic centrifugation shifter Structure is identical.

3. a kind of fixed Two-wheeled third gear fully-automatic gearbox of centre wheel gear ring as claimed in claim 1, its feature exists In：The first automatic centrifugation gearshift also includes at least one first STATEMENT OF FEDERALLY SPONSORED, and first pallet piece connects by first Fitting is installed on the first pallet piece frame, and one end and the activity of the pallet piece of one of them adjacent first of first STATEMENT OF FEDERALLY SPONSORED connect Connect, the other end of first STATEMENT OF FEDERALLY SPONSORED is flexibly connected with the pallet piece of another adjacent first, first pallet piece and First STATEMENT OF FEDERALLY SPONSORED is set in distance in a circumferential direction, and first pallet piece includes first end, the second end and is arranged at The first installation portion between first end and the second end, first installation portion, which is provided with, to be used to install the first of the first connector Mounting hole, the second end of first pallet piece is provided with balancing weight, the outer wall of the second end of at least one the first pallet piece Place is provided with the ratchet portion being engaged with ratchet, the first pallet piece frame or installed in the first STATEMENT OF FEDERALLY SPONSORED or on the first pallet piece There is an elastic component for controlling the first pallet piece initial position, the structure of the second automatic centrifugation shifter and first automatic The structure for centrifuging shifter is identical.

4. a kind of fixed Two-wheeled third gear fully-automatic gearbox of centre wheel gear ring as claimed in claim 2 or claim 3, its feature It is：The first pallet piece frame includes：Several mounting seats that the outer wall of circular base portion and certainly circular base portion stretches out.

5. a kind of fixed Two-wheeled third gear fully-automatic gearbox of centre wheel gear ring as claimed in claim 2 or claim 3, its feature It is：The elastic component is torsion spring, spring or spring leaf.

6. a kind of fixed Two-wheeled third gear fully-automatic gearbox of centre wheel gear ring as claimed in claim 2, its feature exists In：First connector and the second connector are pin.

7. a kind of fixed Two-wheeled third gear fully-automatic gearbox of centre wheel gear ring as claimed in claim 2, its feature exists In：The mating surface of first pallet piece and the first STATEMENT OF FEDERALLY SPONSORED is set in involute shape or arc shaped.

8. a kind of fixed Two-wheeled third gear fully-automatic gearbox of centre wheel gear ring as claimed in claim 1, its feature exists In：One end of the central shaft is provided with boss, and the other end of the central shaft is provided with simultaneously tight part, second gear ring and ratchet sleeve Between connected by bearing or ball, pass through bearing between second gear ring and boss or ball connected, first center Connected, connected between first centre wheel and simultaneously tight part by bearing or ball by bearing or ball between wheel and ratchet sleeve Connect.

9. a kind of fixed Two-wheeled third gear fully-automatic gearbox of centre wheel gear ring as claimed in claim 1, its feature exists In：Freewheel clutch is provided between the power input and ratchet sleeve.