CN207064581U

CN207064581U - A kind of internal speed variator of bicycle and its arrangements for speed regulation

Info

Publication number: CN207064581U
Application number: CN201720590914.7U
Authority: CN
Inventors: 李钢
Original assignee: Individual
Current assignee: Suzhou Houdian Industrial Technology Co ltd
Priority date: 2017-05-25
Filing date: 2017-05-25
Publication date: 2018-03-02
Anticipated expiration: 2027-05-25

Abstract

It is according to the advantages of a kind of internal speed variator of bicycle provided by the utility model and its arrangements for speed regulation：Increase in demand that can be by gear or the quantity of reduction prime planetary gearsets and rear class planet module, flexible design, it is particularly suitable for the internal speed variator of bicycle system of more gear numbers, can sets that smaller speed change is differential and more speed change gears meet the needs of bicyclist, such as：It is the speed change output that 15 gears can be achieved only to need 7 groups of planetary gears, it is effectively equivalent to the bicycle gear of the 21 outer speed changes of speed, when speed than it is differential be set in 1.1 or so when, total no-load voltage ratio is up to 4.18, the utility model control system is extremely simple, the Variable speed spanner for being arranged on handlebar only need to be stirred, drive cam axle, so that cam framework is moved up and down to lock, the corresponding planetary ring gear of unblock, and only need 2 grades of gear auxiliary driving, efficiency high, it is simple in construction, it is greatly reduced appearance and size and weight, the shifting needs of all kinds of bicycles can be fully met.

Description

A kind of internal speed variator of bicycle and its arrangements for speed regulation

Technical field

The utility model belongs to bicycle speed-varying unit field, is related to a kind of internal speed variator of bicycle and its arrangements for speed regulation.

Background technology

Existing bicycle shift system is roughly divided into two kinds, and a kind of is to pass through gear shift in bicycle rear shaft Internal speed-changing system, another kind set the outer speed change of multi-chain gear wheel to be set on bicycle middle shaft on multistage chain wheel and rear vehicle shaft System, wherein, the outer speed change system as multistage adjustable speed simple in construction is widely used, but there is also some not Foot, such as：In stationary vehicle can not speed change, vehicle traveling in speed change when, chain easily comes off with sprocket wheel, due to speed change part Exposed to outer, it need to frequently maintain and just can guarantee that its normal operation, and internal speed-changing system then solves chain with sprocket wheel in speed change The problem of easily coming off, while because its gear part is all enclosed in housing substantially so that it is simple, easy that it is maintained, but Compared with outer speed change system, its maximum deficiency is exactly that its speed change gear is very few, and driving torque fluctuation is excessive, particularly at some During special road section, the torque that can not be adjusted to required for bicyclist, i.e. gear very little, so as to limit it in bicycle art Overall application, with advances in technology, some bicycle producers have developed more gear bicycle internal speed-changing systems in succession, but from Also reach the speed change gear of existing outer multi-speed bicycle for speed change gear far away, and as the increase of gear, internal speed-changing are adjusted The complex degree of structure of speed system also greatly increases therewith, and its cost is too high, and the factors such as volume, weight are excessive also cause it can not In bicycle trade popularization and application.

Utility model content

There is provided the utility model to solve the above problems, its object is to provide can by gear increase in demand or subtract The quantity of few planetary gearsets and planet module, you can reach design requirement, and in light weight, small volume, speed governing is simple, Yi Wei A kind of internal speed variator of bicycle and its arrangements for speed regulation of shield.

The utility model is in order to realize above-mentioned goal of the invention and a kind of internal speed variator of bicycle provided and its speed governing dress Put, including a kind of internal speed variator of bicycle and a kind of arrangements for speed regulation of matched linkage being arranged on vehicle frame.

A kind of described internal speed variator of bicycle, including vehicle frame, handlebar, crank shaft, chain wheel etc., in bicycle rack installation At least one set of planet module is provided with the sleeve of axle, the planet module is provided with ratchet by one group between sun gear and ring gear Planetary gear forms, wherein, axial groove is provided with the ring gear of planetary gearsets is cylindrical, to coordinate the convex of arrangements for speed regulation The locking to planetary gear ring gear is played, the planet carrier of planetary gearsets is coaxially fixed with the crank shaft inputted as power, OK The sun gear of star gear train is fixedly connected with power output shaft and set with crank shaft in coaxial circumferential slippage, and chain wheel is defeated with power Shaft is fixedly connected as power output, by locking of the projection to the cylindrical upper groove of the ring gear of planetary gearsets with unblock come Reach different rotating speed output, so as to reach the purpose of speed change.

A kind of described internal speed variator of bicycle, in order to expand total no-load voltage ratio of internal speed changer, reduce speed than differential, voluntarily Prime and at least one set in the sleeve of vehicle frame installation axis provided with least one set of planetary gear composition are made up of planet module Rear class, wherein, axial groove is equipped with the ring gear of prime and rear class planetary gearsets is cylindrical, to coordinate speed governing to fill The raised locking put, prime planet gear carrier and the planet carrier of rear class planet module are rigidly connected, prime planetary gear Sun gear coaxially fixed with the crank shaft inputted as power, the sun gear of rear class planet module is fixed with power output shaft to be connected Connect and set with crank shaft in coaxial circumferential slippage, chain wheel is fixedly connected with power output shaft as power output, passes through projection The rotating speed that the locking of the cylindrical upper groove of ring gear of the planetary gearsets different to prime or rear class reaches different from unblock is defeated Go out, so as to reach the purpose of speed change.

Described a kind of internal speed variator of bicycle, in order to provide smaller speed while total no-load voltage ratio of internal speed changer is expanded Than differential, it is provided with the sleeve of bicycle rack installation axis and is made up of the planetary gear of multigroup coaxial parallel different no-load voltage ratios Prime, and multigroup coaxial serial rear class being made up of the planet module of different no-load voltage ratios, wherein, in prime and rear class planet Axial groove is equipped with the ring gear of gear train is cylindrical, to coordinate the raised locking of arrangements for speed regulation, prime each group planet The sun gear of gear is coaxially fixed with the crank shaft inputted as power, the planetary planet carrier of prime each group and rear class first The planet carrier of group planet module is rigidly connected mutually, the sun gear of every group of planet module of rear class and the row of next group of planet module Carrier is connected, and the sun gear of last group of planet module is fixedly connected with power output shaft and is in coaxial circumferential slippage with crank shaft Set, chain wheel is fixedly connected with power output shaft as power output, due to the planetary gear of prime multi-set parallel set and after The multigroup serial planet module setting of level, while total no-load voltage ratio of speed changer is expanded, can also bring more speed change gears to adjust Section, by the locking and unblock of the planetary gearsets ring gear different to prime or rear class, to reach different rotating speed output.

It should be noted that：So-called planetary gearsets can be construed to parallel：The sun gear of each group planetary gearsets is same Axle is rigidly connected and the connection of planet carrier coaxial rigid, so-called planet module can be serially construed to：Planet module is organized before rear class Sun gear be connected as power output with rear group planet module as the planet carrier coaxial rigid that power inputs.

After the ring gear of rear class planet module unlocks, planet carrier moves ring gear and sun gear as power input belt Rotate in same direction, when sun gear is as power output, because the monodirectional locking of ratchet limits, ring gear can only be in the same direction with sun gear Synchronized to rotate, now the ring gear of planet module rotates at the same speed in the same direction with planet carrier and sun gear, equivalent to prime planetary gear The planet carrier and power output shaft of group are direct-connected, and the planetary gearsets of the minimum no-load voltage ratio of prime are the minimum no-load voltage ratio of speed changer.

After projection on by cam framework moves down the ring gear of locking rear class planet module, the highest of speed changer Total no-load voltage ratio is equal to the product of the no-load voltage ratio and the planetary gearsets no-load voltage ratio of prime highest no-load voltage ratio of the highest no-load voltage ratio planet module of locking, this When speed changer the total no-load voltage ratio=speed changer of highest highest no-load voltage ratio/speed changer minimum no-load voltage ratio, it is therefore seen that, as rear class is serial The increase of planet module can great transmission expansion device total no-load voltage ratio so that its application is extended, and due to there was only two Level gear drive so that transmission efficiency is improved.

A kind of described internal speed variator of bicycle, locked to be maintained at the ring gear of first group of planet module of rear class Afterwards, planet module enters the ride comfort of speed change after work, no-load voltage ratio and first group of row of prime of first group of level planet module of rear class The no-load voltage ratio product of star gear is more than prime, and last organizes planetary no-load voltage ratio.

Described a kind of internal speed variator of bicycle, in order to expand the total no-load voltage ratio of speed changer, in the ring gear of rear class planet module When unlocking, ratchet is in locking state.

A kind of described arrangements for speed regulation, applied to internal speed variator of bicycle, including：In the sleeve of bicycle rack installation axis Camshaft stand is provided with, rotatable camshaft is provided with camshaft stand, cam is installed with camshaft, The cam framework that can be moved up and down with the rotation of cam is provided with outside cam, is provided with and prime planetary gear on cam framework And the ring gear of rear class planet module it is cylindrical on fit depressions it is raised, when cam framework moves up and down so that raised Ring gear is locked into the cylindrical groove of planetary gear ring gear when moving down, or projection departs from internal tooth when moving up Cylindrical groove is enclosed, releases the locking to ring gear, passes through the ring gear of the projection planetary gearsets different to prime or rear class The locking of cylindrical upper groove exports to reach the different rotating speed of power output shaft, so as to reach the purpose of speed change.

Described a kind of arrangements for speed regulation, in order to provide more gear selections to bicyclist, to reduce the ripple of driving torque It is dynamic, more to adapt to the demand of bicyclist, the multigroup planet of internal speed changer prime is corresponded on the sleeve of bicycle rack installation axis The position of gear sets a set of arrangements for speed regulation, and the multigroup planet of internal speed changer rear class is corresponded on the sleeve of bicycle rack installation axis The position of module sets another set of arrangements for speed regulation.

Described a kind of arrangements for speed regulation, in order to realize that, when speed governing rotating disk rotates, the projection on cam framework can be on demand The cylindrical groove of corresponding planetary gearsets ring gear is engaged, cam is pacified from camshaft by spline by different radial angles Dress.

A kind of described arrangements for speed regulation, the convenient of each group planetary gear ring gear is controlled in order to realize, on camshaft Axially be provided with side by side with planetary gearsets quantity identical cam and cam framework, set between cam framework and axis sleeve There is back-moving spring, speed governing rotating disk is provided with one end of camshaft, by rotating speed governing driven by rotary disc cam rotation.

A kind of described arrangements for speed regulation, in order to also carry out the regulation of speed change gear when vehicle stops, and projection is set to exist Planetary gear ring gear is rotated to smoothly entering snap-lock ring gear after groove, raised and groove during circumference optional position Mutually corresponding sharp-tooth shaped structure is arranged to, wherein, the flank of tooth of pointed tooth stress is vertical with the tangent to periphery direction of ring gear.

A kind of described arrangements for speed regulation, in order to which speed change gear is easy to adjust, speed change is respectively arranged on the left side and the right side in handlebar Gear spanner, and connected by cable with the speed governing rotating disk on the arrangements for speed regulation of corresponding prime and rear class.

By above description it can be seen that：When the ring gear of rear class planet module does not lock, rear class planet module Internal gear, planet carrier, sun gear genlocing, equivalent to a rigidly connected axle, when the parallel multigroup difference of locking prime The ring gear that planetary any one group of no-load voltage ratio, all there can be different rotating speeds to export to power output shaft.

It should be noted that：The no-load voltage ratio of above-mentioned planetary gearsets is：Output speed/input speed, parallel more of prime The different no-load voltage ratio planetary gearsets of group can only lock one of which, can not lock simultaneously more than two, and transmission lock otherwise will occur Dead phenomenon, the locking to the multigroup planet module of rear class is unrestricted, can be combined according to the locking respectively to rear class each group planet module Go out different rotating speed output.

When the ring gear locking of rear class primary planet module, rear class planet module can all be changed into one group of common planet Gear is driven, and now prime planetary gearsets are serially used as power transmission with rear class planet module, and now power is through with after The rigidly connected power output shaft output of sun gear of level planet module.

In summary：The planet module of the no-load voltage ratio of the planetary gearsets of the no-load voltage ratio of speed changer=prime locking × rear class locking Group no-load voltage ratio (in the ring gear locking of the planet module of rear class, no-load voltage ratio=1).

The group number of the variable speed planetary gear group of the speed change gear of speed changer=prime difference no-load voltage ratio × (rear class planet module group Number+n), wherein n is：Part planet module in the equal unlocked state+rear class of ring gear of rear class each group planet module is multigroup Ring gear be locked state+rear class each group planet module ring gear have locked out state, i.e.,：Number of states sum.

Such as：When rear class is tri- groups of planet modules of A, B, C, the planet of speed change gear=prime difference no-load voltage ratio of speed changer Group number × 8 of gear train, (three groups of planet modules As, B, C are unlocked+the planet module of locking：A, B, C, AB, AC, BC, ABC, Totally 8 kinds of states).

It is according to the advantages of a kind of internal speed variator of bicycle provided by the utility model and its arrangements for speed regulation：Can be by gear The increase in demand of position or the quantity for reducing prime planetary gearsets and rear class planet module, flexible design, are particularly suitable for more gears Several internal speed variator of bicycle systems, can set that smaller speed change is differential and more speed change gears meet the need of bicyclist Ask, such as：It is the speed change output that 15 gears can be achieved only to need 7 groups of planetary gears, is effectively equivalent to the guard of bicycle of the 21 outer speed changes of speed Position (because the part speed change gear of outer 21 outer multi-speed bicycles is overlapping), when speed than it is differential be set in 1.1 or so when, total no-load voltage ratio is reachable 4.18, the utility model control system is extremely simple, need to only stir the Variable speed spanner for being arranged on handlebar, drives cam axle, So that cam framework is moved up and down to lock, unlock corresponding planetary ring gear, and 2 grades of gear pairs are only needed to pass Dynamic, efficiency high is simple in construction, be greatly reduced appearance and size and weight, can fully meet the shifting needs of all kinds of bicycles.

Brief description of the drawings

Pass through further describing to elaborate design and application of the present utility model to embodiment below in conjunction with the accompanying drawings.

Fig. 1 is a kind of internal speed variator of bicycle of the utility model and its structure diagram of arrangements for speed regulation embodiment；

Fig. 2 is a kind of internal speed variator of bicycle of the utility model and its structural representation of arrangements for speed regulation embodiment；

Fig. 3 is the schematical sectional view splitted along Fig. 2 line A-A；

Fig. 4 is the schematical sectional view that Fig. 2 line B-B is splitted；

Fig. 5 is Fig. 2 A0 partial enlarged drawings；

Fig. 6 is Fig. 1 A01 partial enlarged drawings；

Fig. 7 is Fig. 1 A1 partial enlarged drawings.

Embodiment

Now, will be described according to embodiment of the present utility model, its example is illustrated in the accompanying drawings.Hereinafter, will Embodiment is described with reference to the accompanying drawings, to explain general plotting of the present utility model.

As shown in Fig. 1 to 2, described a kind of internal speed variator of bicycle, in order to expand the same of total no-load voltage ratio of internal speed changer When bring more speed change gears to adjust, be provided with the sleeve 2 of bicycle rack installation axis and coaxial parallel different become by 7 groups The prime that the planetary gear of ratio is formed, and after 2 groups of coaxial serial planet modules As 1 by different no-load voltage ratios, A2 are formed Level, wherein, planet module is formed by one group between sun gear and ring gear provided with the planetary gear of ratchet, in prime and rear class Axial groove 7 is equipped with the ring gears of planetary gearsets is cylindrical, to coordinate the locking of the projection 9 of arrangements for speed regulation, prime One group of planetary sun gear 4 and the planetary sun gear of remaining each group and the crank shaft 3 as power input are coaxially solid It is fixed, the planetary planet carrier 1 of first group of prime and the planetary planet carrier of remaining each group and first group of planet module of rear class Planet carrier 18 be rigidly connected mutually, the sun gear 14 of first group of planet modules A 1 of rear class and the row of next group of planet modules A 2 Carrier 13 is connected, and the sun gear 11 of second group of planet module is fixedly connected with power output shaft 12 and is in coaxial circles with crank shaft 3 Slide in week and set, chain wheel 25 is fixedly connected as power output with power output shaft 12, due to the planet tooth of prime multi-set parallel Wheel setting and the multigroup serial planet module setting of rear class, while total no-load voltage ratio of speed changer is expanded, can also bring more Speed change gear is adjusted, defeated come the rotating speed that reaches different by the locking of the planetary gearsets ring gear different to prime or rear class Go out.

As shown in figure 1, a kind of described internal speed variator of bicycle, in order to be maintained in first group of planet modules A 1 of rear class For gear ring 17 after locking, planet modules A 1 enters the ride comfort of speed change after work, the no-load voltage ratio of first group of planet modules A 1 of rear class Being more than prime with first group of planetary no-load voltage ratio product of prime, last organizes planetary no-load voltage ratio.

As shown in Figures 2 to 4, described a kind of arrangements for speed regulation, applied to internal speed variator of bicycle, including：In bicycle rack The sleeve 2 of installation axis is provided with camshaft stand 21, rotatable camshaft 20 is provided with camshaft stand 21, in cam Cam 24 is installed with axle 20, the cam framework that can be moved up and down with the rotation of cam 24 is provided with outside cam 24 22, be provided with cam framework 22 with prime planetary gear and the ring gear of rear class planet module it is cylindrical on groove 7 match Projection 9 is closed, when cam framework 22 moves up and down so that projection 9 is cylindrical into planetary gear ring gear when moving down Groove 7 locks ring gear 6, or projection 9 departs from the cylindrical groove 7 of ring gear when moving up, and releases the lock to ring gear 6 Fixed, the locking by the cylindrical upper groove 7 of ring gear of the different planetary gearsets of raised 9 pairs of primes or rear class is defeated to reach power The different rotating speed output of shaft, so as to reach the purpose of speed change.

As shown in Fig. 2 a kind of described arrangements for speed regulation, in order to provide more gear selections to bicyclist, are passed with reducing The fluctuation of kinetic moment, more to adapt to the demand of bicyclist, before corresponding to internal speed changer on the sleeve 2 of bicycle rack installation axis The multigroup planetary position of level sets a set of arrangements for speed regulation, and internal speed changer is corresponded on the sleeve 2 of bicycle rack installation axis The position of the multigroup planet module of rear class sets another set of arrangements for speed regulation.

As shown in Fig. 2 to 3, a kind of described arrangements for speed regulation, in order to realize when speed governing rotating disk 19 rotates, cam framework 22 On projection 9 can be engaged the cylindrical groove 7 of corresponding planetary gearsets ring gear on demand, cam 24 is logical with camshaft 20 Spline is crossed to install by different radial angles.

As shown in Fig. 2 a kind of described arrangements for speed regulation, are controlled the convenient of each group planetary gear ring gear to realize, On camshaft 20 axially be provided with side by side with planetary gearsets quantity identical cam 24 and cam framework 22, in cam framework Back-moving spring 23 is provided between 22 and axis sleeve 2, speed governing rotating disk 19 is provided with one end of camshaft, by rotating speed governing rotating disk 19 band moving cams 24 rotate.

As shown in figure 3, a kind of described arrangements for speed regulation, in order to also carry out the regulation of speed change gear when vehicle stops, And projection 9 is set can smoothly to enter snap-lock internal tooth after groove 7 when planetary gear ring gear is rotated to circumference optional position Circle, projection 9 are arranged to mutual corresponding sharp-tooth shaped structure with groove 7, wherein, the flank of tooth of pointed tooth stress and the circumference of ring gear are cut Line direction is vertical.

A kind of described arrangements for speed regulation, in order to which speed change gear is easy to adjust, speed change is respectively arranged on the left side and the right side in handlebar Gear spanner, and connected by cable with the speed governing rotating disk 19 on the arrangements for speed regulation of corresponding prime and rear class.

It should be noted that：Above-described embodiment is in order to facilitate speed governing and the more gears of setting, when prime is arranged to 7 groups of rows Star gear, 2 groups of planet modules of rear class are arranged to：It is described during three kinds of states that A1 lockings, A2 lockings and A1A2 are not locked A kind of internal speed variator of bicycle can become the speed output for dissolving 7 × 3=21, can meet the needs of most of bicycles substantially, The bicycle ridden to ordinary municipal, speed change gear can be also reduced, with one group of prime planetary gear and one group of rear class planet module Combination can obtain three kinds of speed thresholds, such as only with the available two kinds of speed thresholds of one group of planet module, structure is also simpler, From the above, it can be seen that the quantity of planetary gearsets and planet module by the demand of gear, can be increased or decreased, you can reach To design requirement, flexible design, it is particularly suitable for the transmission systems of more gear numbers, above is to the utility model embodiment Specifically describe, this is not the restriction to spirit and scope of the present utility model, is not departing from the utility model design conception Under the premise of, ordinary skill technical staff makes to the utility model in this area various modifications and improvement, this reality all should be fallen into With new protection domain, the claimed technology contents of the utility model are already recorded in claims.

Claims

1. a kind of internal speed variator of bicycle, including vehicle frame, handlebar, crank shaft, chain wheel etc., it is characterised in that：Pacify in bicycle rack Fill in the sleeve of axis and be provided with least one set of planet module, the planet module is provided with spine by one group between sun gear and ring gear The planetary gear composition of wheel, wherein, axial groove is provided with the ring gear of planetary gearsets is cylindrical, to coordinate arrangements for speed regulation The raised locking to planetary gear ring gear, the planet carrier of planetary gearsets coaxially consolidates with the crank shaft as power input Fixed, the sun gear of planetary gearsets is fixedly connected with power output shaft and with crank shaft in the setting of coaxial circumferential slippage, chain wheel and Power output shaft is fixedly connected as power output.

A kind of 2. internal speed variator of bicycle as claimed in claim 1, it is characterised in that：In the sleeve of bicycle rack installation axis The interior prime provided with least one set of planetary gear composition and at least one set of rear class being made up of planet module, wherein, in prime And rear class planetary gearsets ring gear it is cylindrical on be equipped with axial groove, it is preceding to coordinate the raised locking of arrangements for speed regulation Level planet gear carrier and the planet carrier of rear class planet module are rigidly connected, and the planetary sun gear of prime is with being used as power The crank shaft of input is coaxially fixed, and the sun gear of rear class planet module is fixedly connected with power output shaft and with crank shaft in coaxial Circumferential slippage is set, and chain wheel is fixedly connected as power output with power output shaft.

A kind of 3. internal speed variator of bicycle as claimed in claim 1 or 2, it is characterised in that：In bicycle rack installation axis The prime being made up of the planetary gear of multigroup coaxial parallel different no-load voltage ratios is provided with sleeve, and it is multigroup coaxial serial by not The rear class formed with the planet module of no-load voltage ratio, wherein, it is equipped with the ring gear of prime and rear class planetary gearsets is cylindrical The groove of axial direction, to coordinate the raised locking of arrangements for speed regulation, the planetary sun gear of prime each group as power with inputting Crank shaft coaxially fix, the planet carrier of the planetary planet carrier of prime each group and first group of planet module of rear class is mutually just Property connection, the sun gear of each group of planet module of rear class is connected with the planet carrier of next group of planet module, last group of planet mould The sun gear of block is fixedly connected with power output shaft and set with crank shaft in coaxial circumferential slippage, and chain wheel is consolidated with power output shaft Fixed connection is used as power output.

A kind of 4. internal speed variator of bicycle as claimed in claim 3, it is characterised in that：First group of level planet module of rear class More than prime, last organizes planetary no-load voltage ratio to no-load voltage ratio with the planetary no-load voltage ratio product of first group of prime, in rear class planet mould When the ring gear of block unlocks, ratchet is in locking state.

A kind of 5. arrangements for speed regulation, it is characterised in that：Applied to internal speed variator of bicycle, including camshaft stand, in camshaft branch Frame is provided with rotatable camshaft, and cam is installed with camshaft, and being provided with outside cam can be with the rotation of cam And the cam framework moved up and down, projection is provided with cam framework, it is described raised cylindrical with the ring gear of planetary gearsets On fit depressions, when cam framework moves up and down so that projection enters the groove when moving down, locking internal tooth Circle, or projection depart from the groove when moving up, and release the locking to ring gear.

A kind of 6. arrangements for speed regulation as claimed in claim 5, it is characterised in that：Cam presses different footpaths from camshaft by spline Installed to angle.

A kind of 7. arrangements for speed regulation as claimed in claim 5, it is characterised in that：Axially it is provided with side by side and planet on camshaft Gear train quantity identical cam and cam framework, back-moving spring is provided between cam framework and axis sleeve, in camshaft One end be provided with speed governing rotating disk, by rotating speed governing driven by rotary disc cam rotation.

A kind of 8. arrangements for speed regulation as claimed in claim 5, it is characterised in that：It is raised to be arranged to mutual corresponding pointed tooth with groove Shape structure, wherein, the flank of tooth of pointed tooth stress is vertical with the tangent to periphery direction of ring gear.

A kind of 9. arrangements for speed regulation as claimed in claim 7, it is characterised in that：The arrangements for speed regulation are additionally provided with speed change gear and pulled Hand, the speed change gear spanner are connected by cable with speed governing rotating disk.