CN2479248Y - Automatic speed-regulating driving wheel - Google Patents

Abstract

Disclosed is a drive pulley with automatic speed controlling and torque converting, comprising a variable speed device, an engaging and disengaging device and a detent device. The drive pulley with automatic speed controlling and torque converting can achieve the best matching of power between the machine apparatus and the power machine, thereby realizing the operation of power adjustment and saving electric-energy obviously. The utility model also has the advantages of low price and convenient utilization and is in particular applied to the utilization of beam-pumping unit in the machine apparatus of oil extraction of the oil industry.

Description

Automatic speed regulation, bending moment drive wheel

The utility model relates to mechanical transmission, particularly a kind of automatic speed regulation, bending moment drive wheel.

Widespread usage beam pumping unit in the present petroleum machinery oil production equipment, for adapting to the needs of this machine starting and operation, the general motor of 28-75Kw that adopts provides power for it, and beam pumping unit is after starting, when entering normal operating condition, generally only need the power about 15-22Kw, the configuration of this " low load with strong power ", make the load factor of motor on the low side, the waste electric energy.Address the above problem the two big class measures that mainly contain at present: a class is reform motor and control thereof, and second class is to install mechanical gear shift device additional.The measure of reforming motor and control thereof has: adopt the high-slip threephase asynchronous, pole-changing control, electromagnetic varispeed motor etc.Though the starting torque of high-slip threephase asynchronous increases to some extent, power consumption, electricity when normal operation decrease but very big.Employing pole-changing control, electromagnetic varispeed motor and vector control technology can be under the situations as certain loads such as blower fans, the soft start characteristic is better, saving power, but when low speed, its slip power loss is big, starting torque does not improve significantly yet, so still be difficult to realize the equipment of this specific load characteristic of beam pumping unit and the best configuration between the motor.The measure that second class installs mechanical gear shift device additional has: the principle of imitation automotive transmission installs mechanical transmission additional between pumping unit and motor, though this method row, but there is more drawback: the one, the position of pumping unit installation motor is limited, if additionally install a mechanical transmission also bigger than motor again additional, real is difficulty; The 2nd, utilization ratio is low, and mechanical loss is big; The 3rd, the improvement project amount is big, drops into high; The 4th, subject to artificial destruction, touch in order to prevent the not operation personnel, also to pin some operating handles of mechanical transmission, these measures should be increased input, and make troubles to operation again; The 5th, work as beam pumping unit and be in operation, when oil well took place by " tying cured " or " husky card ", mechanical transmission can not automatically be adjusted motor output torque and easy initiating failure and accident.In sum, more existing measures at present also are not the Perfected process that solves configuration contradiction between beam pumping unit and the motor.

The purpose of this utility model is to provide a kind of automatic speed regulation, bending moment drive wheel at above-mentioned the deficiencies in the prior art part, makes between beam pumping unit and the motor, reach the optimum Match of power, can realize the Power Regulation operation, significantly saving power, and it is cheap, easy to use.

The purpose of this utility model is achieved through the following technical solutions: a sharp automatic speed regulation, the bending moment drive wheel, comprise speed change gear, engaging and disengaging gear, speed change gear comprises sun gear, planet wheel, the internal frame dish, the dish axle, planet carrier coils outward, the inner tooth type drive wheel, axle sleeve, outer dish bearing, internal frame dish bearing, wheel bearing, wheel cap and wheel cap bearing etc., sun gear is fixed by the wheel key with axle sleeve is coaxial, outer dish of planet carrier and internal frame dish are positioned at a sun gear left side, right both sides, respectively with outer dish bearing and internal frame dish bearing suit, be fixed on the axle sleeve, planet wheel is sleeved on the dish axle between outer dish of planet carrier and the internal frame dish, planet wheel is meshed with the inner tooth type drive wheel, and the inner tooth type drive wheel is fixed on the axle sleeve by wheel bearing.Engaging and disengaging gear is no spring brake shoe centrifugal clutch, by with the inner tooth type drive wheel be that the leading truck of one, fan-shaped brake shoe, friction plate, driving disc are formed, the driving disc coaxial package is fixed by the dish key on axle sleeve, fan-shaped brake shoe is housed between leading truck and driving disc, is fixed with friction plate on the side of the external arc of fan-shaped brake shoe.This automatic speed regulation, the displacement drive wheel also comprises release, by the master control bar, the bundle ratch, compositions such as housing, the master control bar, the bundle ratch is positioned at housing, the master control bar is that rotate in the center of circle with the bar axle, between the fixing column of its left end hole and its positive lower end extension spring is housed, upper part at master control bar right-hand member, one stop column is independently arranged, the right-hand member of master control bar is pointed, on its left top one boss is arranged, reed is that rotate in the center of circle with the bobbin on the master control bar, a roller is adorned in the reed underpart, the bundle ratch is provided with the bundle tooth of certain radian and hook-shaped following tail end, the bundle ratch can be that rotate in the center of circle with the upper shaft on its right-hand member top, between the extension spring hole on its right top and the spring-hanging rod of its positive lower end the stretching spring is housed, the underpart of bundle ratch and the roller of reed underpart freely roll, joining of displacement type is phased, the bar axle, bobbin, upper shaft, fixing column, stop column and spring-hanging rod all are through on the sidewall on housing two sides.Between the sun gear of speed change gear and the planet wheel by middle drive wheel respectively with they engagement driving, process a bundle wheel shape double wedge on the outer annulus edge of the outer dish of planet carrier, can match with the boss on the master control bar.

When the starting beam pumping unit, motor is rotated counterclockwise, the sun gear of this moment is also synchronous, rotation in the same way, middle drive wheel then turns clockwise, planet wheel is rotated counterclockwise, because being used to of beam pumping unit, the resistance of inertia and oil well, driving wheel by beam pumping unit, driving belt passes to automatic speed regulation, on the inner tooth type drive wheel of bending moment drive wheel, make the inner tooth type drive wheel temporarily be in relative static conditions, the planet wheel that is engaged with, middle drive wheel is at sun gear, both under the driving of motor, driving planet carrier coils outward, planet wheel, the integral body that middle drive wheel and internal frame dish are formed, by outer dish bearing, internal frame dish bearing turns clockwise on axle sleeve, the reed that bundle wheel shape double wedge on the outer dish of planet carrier at first promotes in the release when turning clockwise rotates counterclockwise, the roller of its underpart then promotes to restraint ratch and also is rotated counterclockwise, bundle tooth on the bundle ratch discharges the right-hand member of master control bar like this, the master control bar is rotated counterclockwise under the effect of extension spring, its right part is blocked by stop column, when dish outside the planet carrier continues to turn clockwise, the boss of the left tip portion of master control bar has just blocked the bundle wheel shape double wedge on the outer dish of planet carrier, planet carrier is coiled outward, planet wheel, the integral body that middle drive wheel and internal frame dish are formed stops operating, and force the inner tooth type drive wheel counterclockwise, the slow-speed of revolution, big torque ground rotation, the driving wheel that drags beam pumping unit by driving belt starts the beam pumping unit running.Work as automatic speed regulation, bending moment drive wheel running near or during the rated revolution of near its speed change gear output, with the inner tooth type drive wheel be that the fan-shaped brake shoe that is provided with in the leading truck of one is under action of centrifugal force, move outward press to motor synchronous, with speed, homodromal driving disc, and inner tooth type drive wheel rotating speed is increased, the centrifugal force of fan-shaped brake shoe also increases thereupon, friction plate on the fan-shaped brake shoe and the frictional force between the driving disc force the rotating speed of inner tooth type drive wheel to begin to improve rotating speed under the rated speed state of former deceleration, at this moment automatic speed regulation, the moment of the speed change gear inside of bending moment drive wheel begins to change, planet carrier coils outward, planet wheel, the integral body that middle drive wheel and internal frame dish are formed is transferred to rotation counterclockwise, because the hypotenuse of the bundle wheel shape double wedge on the outer dish of planet carrier presses the master control bar that pushes away release to turn clockwise, the bundle tooth that its right-hand member is restrainted on the ratch blocks, planet carrier coils beginning outward and rotates unimpededly, and make the inner tooth type drive wheel under fan-shaped brake shoe action of centrifugal force very fast near and reach driving disc rotating speed, the both rated speed of motor.So motoring automatic speed regulation, bending moment drive wheel, the driving wheel that connects beam pumping unit by driving belt provides the power of normal operation for beam pumping unit.When beam pumping unit in when operation, when in case " tying cured " or " husky card " takes place, the superordinary resistance of oil well increases load and forces motor speed to descend, when reducing to certain rotating speed, the centrifugal force of fan-shaped brake shoe also reduces thereupon in the arrangements for speed regulation, and produce slip gradually with driving disc, planet carrier is coiled outward, planet wheel, the integral body that middle drive wheel and internal frame dish are formed turns clockwise, boss on the master control bar in the release blocks the double wedge on the outer dish of planet carrier again, planet carrier is coiled outward, planet wheel, the integral body that middle drive wheel and internal frame dish are formed stops operating, automatic speed regulation, the torque of bending moment drive wheel increases again, after overcoming the superordinary resistance of oil well, the motor revolution raises again, fan-shaped brake shoe in the arrangements for speed regulation is under action of centrifugal force, begin again outer move press to motor synchronous, with speed, homodromal driving disc, and inner tooth type drive wheel rotating speed is increased, the centrifugal force of fan-shaped brake shoe also increases thereupon, friction plate on the fan-shaped brake shoe and the frictional force between the driving disc force the rotating speed of inner tooth type drive wheel to begin to improve rotating speed under the rated speed state of former deceleration again, at this moment automatic speed regulation, the moment of the speed change gear inside of bending moment drive wheel begins again to change, planet carrier coils outward, planet wheel, the integral body that middle drive wheel and internal frame dish are formed is transferred to rotation counterclockwise, because the hypotenuse of the bundle wheel shape double wedge on the outer dish of planet carrier presses the master control bar that pushes away release that its right-hand member is turned clockwise, and the bundle tooth of being restrainted on the ratch blocks, the outer dish of planet carrier begins again to rotate unimpededly, and make the inner tooth type drive wheel under fan-shaped brake shoe action of centrifugal force soon near and reach the rotating speed of driving disc, the both rated speed of motor.So motoring automatic speed regulation, bending moment drive wheel automatically restore to rated speed again, so Zhou Er renews the ground auto-control, guarantees that all the time beam pumping unit is in normal running state.The utility model can be according to the technical requirements of disposing between machinery and the power engine, be the suitable gear ratio of its speed change gear design, for example: the beam pumping unit of a former configuration 55Kw motor, after installing the automatic speed regulation, bending moment drive wheel of 2: 1 velocity ratios, the motor that need only dispose 28Kw just can make this beam pumping unit start reliably and operation normally, and the effect of its economize on electricity is very remarkable.

The utility model compared with prior art has following advantage: this automatic speed regulation, bending moment drive wheel, can make between beam pumping unit and the motor, and between other machinery and the machinery, between machinery and the power engine, reach the optimum Match of power, realized the Power Regulation operation, improved the efficient of equipment, saved electric energy significantly, its application is extensive, cheap, easy to use.

Accompanying drawing 1 is structure of the present utility model, principle schematic; Accompanying drawing 2 is principle schematic of its speed change gear: accompanying drawing 3 is structure, principle schematic of its engaging and disengaging gear; Accompanying drawing 4 is structure, principle schematic of its release; Accompanying drawing 5 is its block diagrams that are applied in the beam pumping unit principle.Accompanying drawing 6 is block diagrams of its design principle.

Below in conjunction with accompanying drawing in detail embodiment of the present utility model is described in detail: a kind of automatic speed regulation, bending moment drive wheel 3 comprise speed change gear 6, engaging and disengaging gear 7 (see figure 6)s.Speed change gear 6 comprises sun gear 24, planet wheel 11, internal frame dish 27, dish axle 14, the outer dish 9 of planet carrier, inner tooth type drive wheel 8, axle sleeve 10, outer dish bearing 18, internal frame dish bearing 19, wheel bearing 20, wheel cap 30 and wheel cap bearing 21, sun gear 24 is coaxial fixing by wheel key 25 with axle sleeve 10, outer dish 9 of planet carrier and internal frame dish 27 are positioned at sun gear 24 left sides, right both sides, respectively with outer dish bearing 18 and internal frame dish bearing 19 suits, be fixed on the axle sleeve 10, planet wheel 11 is sleeved on the dish axle 14 between outer dish 9 of planet carrier and the internal frame dish 27, and planet wheel 11 is meshed with inner tooth type drive wheel 8 simultaneously.Inner tooth type drive wheel 8 is fixed on the axle sleeve 10 by wheel bearing 20.Engaging and disengaging gear 7 is no spring brake shoe centrifugal clutch, by forming for the leading truck 31 of one, fan-shaped brake shoe 26, friction plate 28, driving disc 22 with inner tooth type drive wheel 8, driving disc 22 coaxial packages are fixing by dish key 23 on axle sleeve 10, fan-shaped brake shoe 26 is housed between leading truck 31 and driving disc 22, is fixed with friction plate 28 (seeing Fig. 1, Fig. 3, Fig. 2) on the side of the external arc of fan-shaped brake shoe 26.This automatic speed regulation, displacement drive wheel also comprise release 5, are made up of master control bar 32, bundle ratch 40, housing 33 etc.Master control bar 32, bundle ratch 40 is positioned at housing 33, master control bar 32 is that rotate in the center of circle with bar axle 34, between the fixing column 38 of its left end hole 35 and its positive lower end extension spring 36 is housed, upper part at master control bar 32 right-hand members, one stop column 45 is independently arranged, the right-hand member of master control bar 32 is pointed, on its left top one boss 50 is arranged, reed 47 is that rotate in the center of circle with the bobbin on the master control bar 32 46, a roller 39 is adorned in reed 47 underparts, bundle ratch 40 is provided with the bundle tooth 49 of certain radian and hook-shaped following tail end, bundle ratch 40 can be that rotate in the center of circle with the upper shaft 43 on its right-hand member top, between the extension spring hole 44 on its right top and the spring-hanging rod 41 of its positive lower end stretching spring 42 is housed, the underpart of bundle ratch 40 and the roller 39 of reed 47 underparts freely roll, joining of displacement type is phased, bar axle 34, bobbin 46, upper shaft 43, fixing column 38, stop column 45 and spring-hanging rod 41 all are through on the both sidewalls of housing 33, between the sun gear 24 of speed change gear 6 and the planet wheel 11 by middle drive wheel 12 respectively with they engagement driving, process a bundle wheel shape double wedge 48 on the outer annulus edge of the outer dish 9 of planet carrier, (see figure 4) can match with the boss 50 on the master control bar.Wheel cap 30 by wheel cap bearing 21 equal suits, be fixed on the axle sleeve 10, and wheel cap 30 and inner tooth type drive wheel 8 are fastened as one with screw 15, the outside of wheel cap bearing 21, nut 16 is arranged, tightly be screwed on the axle sleeve 10, prop up the interior cover of wheel cap bearing 21, wheel cap 30 and inner tooth type drive wheel 8 are positioned on the axle sleeve 10 by wheel bearing 20, wheel cap bearing 21 reliably for the parts of one.On the excircle of inner tooth type drive wheel 8 and wheel cap 30, can process transmission trough of belt 13, for hanging driving belt 2 (seeing Fig. 1, Fig. 2).If 4 on motor is installed end centers of drive wheel and is provided with screw hole, the then available screw that adapts is fastened on baffle plate 29 on the spindle nose of motor 4, so that automatic speed regulation, bending moment drive wheel 3 are fixed on the axle of motor 4 more reliably.Automatic speed regulation, bending moment drive wheel 3 are installed on the output shaft of motor 4, release 5 usefulness screws pass on the lengthening base that its mounting hole 37 is fixed on motor 4, bundle wheel shape double wedge 48 on the outer annulus edge of the outer dish 9 of planet carrier in the speed change gear 6 of boss 50 and automatic speed regulation, bending moment drive wheel 3 on its master control bar 32 is matched, and driving belt 2 couples together the driving wheel on the beam pumping unit 1 and automatic speed regulation, bending moment drive wheel 3.When automatic speed regulation, bending moment drive wheel 3 are installed, should be contained in positioning key in the keyway 17 of the keyway of 4 on motor and automatic speed regulation, bending moment drive wheel 3 axle sleeves 10, so that locate reliably, be bound up between motor 4 and automatic speed regulation, the bending moment drive wheel 3, make their coaxial, synchronously rotations (seeing Fig. 5, Fig. 2, Fig. 4).When the starting beam pumping unit, motor 4 is rotated counterclockwise, the sun gear 24 of this moment is also synchronous, rotation in the same way, middle 12 of drive wheels turn clockwise, planet wheel 11 is rotated counterclockwise, because being used to of beam pumping unit, the resistance of inertia and oil well, driving wheel 1 by beam pumping unit, driving belt 2 passes to automatic speed regulation, on the inner tooth type drive wheel 8 of bending moment drive wheel 3, make inner tooth type drive wheel 8 temporarily be in relative static conditions, the planet wheel 11 that is engaged with, middle drive wheel 12 is at sun gear 24, both under the driving of motor 4, drive the outer dish 9 of planet carrier, planet wheel 11, the integral body that middle drive wheel 12 and internal frame dish 27 are formed, by outer dish bearing 18, internal frame dish bearing 19 turns clockwise on axle sleeve 10, the reed 47 that bundle wheel shape double wedge 48 on the outer dish 9 of planet carrier at first promotes when turning clockwise in the release 5 rotates counterclockwise, 39 on the roller of its underpart promotes bundle ratch 40 and also is rotated counterclockwise, bundle tooth 49 on the bundle ratch 40 discharges the right-hand member of master control bar 32 like this, master control bar 32 is rotated counterclockwise under the effect of extension spring 36, its right part is blocked by stop column 45, when dish 9 continues to turn clockwise outside the planet carrier, the boss 50 of the left tip portion of master control bar 32 has just blocked the bundle wheel shape double wedge 48 on the outer dish 9 of planet carrier, make the outer dish 9 of planet carrier, planet wheel 11, the integral body that middle drive wheel 12 and internal frame dish 27 are formed stops operating, and force inner tooth type drive wheel 8 counterclockwise, the slow-speed of revolution, big torque ground rotation, the driving wheel 1 that drags beam pumping unit by driving belt 2 starts the beam pumping unit running.Work as automatic speed regulation, bending moment drive wheel 3 running near or during the rated revolution of near its speed change gear 6 outputs, with inner tooth type drive wheel 8 be that the fan-shaped brake shoes 26 that are provided with in the leading truck 31 of one are under action of centrifugal force, move outward press to motor synchronous, with speed, homodromal driving disc 22, and inner tooth type drive wheel 8 rotating speeds are increased, the centrifugal force of fan-shaped brake shoe 26 also improves thereupon, friction plate 28 on the fan-shaped brake shoe and the frictional force between the driving disc 22 force the rotating speed of inner tooth type drive wheel 8 to begin to improve rotating speed under the rated speed state of former deceleration, at this moment automatic speed regulation, the moment of speed change gear 6 inside of bending moment drive wheel 3 begins to change, the outer dish 9 of planet carrier, planet wheel 11, the integral body that middle drive wheel 12 and internal frame dish 27 are formed is transferred to rotation counterclockwise, because the hypotenuse of the bundle wheel shape double wedge 48 on the outer dish 9 of planet carrier presses the master control bar 32 that pushes away release 5 to turn clockwise, the bundle tooth 49 that its right-hand member is restrainted on the ratch 40 blocks, outer dish 9 beginnings of planet carrier rotation unimpededly, and make inner tooth type drive wheel 8 under fan-shaped brake shoe 26 action of centrifugal force, soon near and reach the rotating speed of driving disc 22, the both rated speed of motor 4.So motor 4 drives automatic speed regulation, bending moment drive wheel 3, provide the power of normal operation for beam pumping unit by the driving wheel 1 of driving belt 2 connection beam pumping units.When beam pumping unit in when operation, when in case " tying cured " or " husky card " takes place, the superordinary resistance of oil well increases load and forces motor 4 rotating speeds to descend, when reducing to certain rotating speed, the centrifugal force of fan-shaped brake shoe 26 also reduces thereupon in the arrangements for speed regulation 6, and produce slip gradually with driving disc 22, make the outer dish 9 of planet carrier, planet wheel 11, the integral body that middle drive wheel 12 and internal frame dish 27 are formed turns clockwise, boss 50 on the master control bar 32 in the release 5 blocks the double wedge 48 on the outer dish 9 of planet carrier again, make the outer dish 9 of planet carrier, planet wheel 11, the integral body that middle drive wheel 12 and internal frame dish 27 are formed stops operating, automatic speed regulation, the torque of bending moment drive wheel 3 increases again, after overcoming the superordinary resistance of oil well, motor 4 revolutions raise, fan-shaped brake shoe 26 in the arrangements for speed regulation 6 is under action of centrifugal force, begin again outer move press to motor 4 synchronous, with speed, homodromal driving disc 22, and inner tooth type drive wheel 8 rotating speeds are increased, the centrifugal force of fan-shaped brake shoe 26 also increases thereupon, friction plate 28 on the fan-shaped brake shoe 26 and the frictional force between the driving disc 22 force the rotating speed of inner tooth type drive wheel 8 to begin to improve rotating speed under the rated speed state of former deceleration again, at this moment automatic speed regulation, the moment of speed change gear 6 inside of bending moment drive wheel 3 begins again to take place to become to transform, the outer dish 9 of planet carrier, planet wheel 11, the integral body that middle drive wheel 12 and internal frame dish 27 are formed is transferred to rotation counterclockwise, because the hypotenuse of the bundle wheel shape double wedge 48 on the outer dish 9 of planet carrier presses the master control bar 32 that pushes away release 5 that its right-hand member is turned clockwise, and the bundle tooth of being restrainted on the ratch 40 49 blocks, the outer dish 9 of planet carrier begins again to rotate unimpededly, and make inner tooth type drive wheel 8 under fan-shaped brake shoe 26 action of centrifugal force soon near and reach the rotating speed of driving disc 22, the both rated speed of motor 4.So motor 4 drives automatic speed regulation, bending moment drive wheel 3 automatically restores to rated speed again, auto-control guarantees that all the time beam pumping unit is in normal running state so again and again.

Automatic speed regulation, bending moment drive wheel 3 are by release 5 under the control of engaging and disengaging gear 6, catch, the outer dish 9 of vertical planet carrier realizes automatic speed regulation of the present invention and automatic torque-changing, drive wheel 12 in the middle of also can not adorning, catch, indulge inner tooth type drive wheel 8 with release 5, do torque output with the outer dish 9 of planet carrier, also can realize automatic speed regulation and automatic torque-changing.

Claims (3)

1, a kind of automatic speed regulation, the bending moment drive wheel, comprise speed change gear, engaging and disengaging gear, speed change gear comprises sun gear, planet wheel, the internal frame dish, the dish axle, planet carrier coils outward, the inner tooth type drive wheel, axle sleeve, outer dish bearing, internal frame dish bearing, wheel bearing, wheel cap and wheel cap bearing, sun gear is fixed by the wheel key with axle sleeve is coaxial, outer dish of planet carrier and internal frame dish are positioned at the sun gear left and right sides, respectively with outer dish bearing and internal frame dish bearing suit, be fixed on the axle sleeve, planet wheel is sleeved on the dish axle between outer dish of planet carrier and the internal frame dish, planet wheel and inner tooth type drive wheel are meshed, the internal tooth form drive wheel is fixed on the axle sleeve by wheel bearing, engaging and disengaging gear is no spring brake shoe centrifugal clutch, by with the internal tooth form drive wheel be the leading truck of one, fan-shaped brake shoe, friction plate, driving disc is formed, the driving disc coaxial package is fixed by the dish key on axle sleeve, fan-shaped brake shoe is housed between leading truck and driving disc, be fixed with friction plate on the side of fan-shaped brake shoe external arc, it is characterized in that this automatic speed regulation, the bending moment drive wheel also comprises release, by the master control bar, the bundle ratch, housing is formed, the master control bar, the bundle ratch is positioned at housing, the master control bar is that rotate in the center of circle with the bar axle, between the fixing column of its left end hole and its positive lower end extension spring is housed, in master control bar right-hand member upper part, one stop column is independently arranged, on top, a master control bar left side one boss is arranged, right-hand member is pointed, reed is that rotate in the center of circle with the bobbin on the master control bar, a roller is adorned in the reed underpart, on the bundle ratch bundle tooth of certain radian and hook-shaped following tail end are arranged, the bundle ratch can be that rotate in the center of circle with the upper shaft on its right-hand member top, between the extension spring hole on its right top and the spring-hanging rod of its positive lower end the stretching spring is housed, the bundle upper shaft, fixing column, stop column and spring-hanging rod all are through on the both sidewalls of housing, between the sun gear of speed change gear and the planet wheel by middle drive wheel respectively with they engagement driving, process the double wedge of a bundle wheel shape on the outer annulus edge of the outer dish of the planet carrier on the speed change gear, can match with the boss on the master control bar.

2, automatic speed regulation according to claim 1, bending moment drive wheel, it is characterized in that wheel cap by wheel cap bearing suit, be fixed on the axle sleeve and the internal tooth form drive wheel fastens as one, there is nut in the wheel cap bearing outside, tightly is screwed on the axle sleeve.

3, automatic speed regulation according to claim 1, bending moment drive wheel is characterized in that can processing the transmission trough of belt on the excircle of inner tooth type drive wheel and wheel cap, for hanging driving belt.

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