CN209616873U - A kind of positive and negative unidirectional coaxial two stage speed change wheel apparatus - Google Patents

Abstract

The utility model discloses a kind of positive and negative unidirectional coaxial two stage speed change wheel apparatus, including by input shaft, driving wheel, output wheel, sun gear, determine planetary gear, determine a gear mechanism and two retaining devices being made of input shaft, swinging block type primary one-way clutch, output wheel that planet wheel spindle, transition isolator, low speed isolator form.The characteristic that the utility model makes full use of motor that can rotate with both forward and reverse directions, and the unidirectional characteristic effectively rotated of isolator, it is realized by the direction of rotation of switch motor in the same direction, the output of two gear-stage velocity ratio of linear drives, there is flexible Application compared to conventional gearbox, it is versatile, compact, it does not account for except the huge advantages such as vehicle space, the hand push that battery-operated motor cycle has also been solved perfectly in the utility model advances and hand push reversing problems, and the problem of low speed isolator fast idle friction, this can not only greatly improve the service life of gear, and also reduce the difficulty of technique, be conducive to be mass produced.

Description

A kind of positive and negative unidirectional coaxial two stage speed change wheel apparatus

Technical field

The utility model belongs to vehicle technology field, and in particular to a kind of positive and negative unidirectional coaxial two for electric vehicle Grade speed-variation wheel device.

Background technique

Electric vehicle is the developing direction of the current vehicles, it is therefore an objective to use the high energy consumption maximum discharge of new energy motive force substitute Traditional fossil energy power, to solve the problems, such as that earth environment pollution and fossil resources are exhausted.But current electric drive The problems of be it is various, such as the structure installation question of battery-operated motor cycle, the efficiency and speed change of electric control Problem etc..

Nowadays, traditional electric bicycle, such as electric bicycle, the general wheel hub for using electric-machine directly-driven or level-one speed change Motor, and country has strictly regulated its travel speed, and usual speed per hour is no more than 30 kilometers, therefore technology is very mature, substantially Meet the requirement of electric bicycle.But traditional battery-operated motor cycle is just less in luck, during the last ten years, electric motorcycle Vehicle it is unsuccessful, a main reason be that electric efficiency application the problem of.It is well known that motor can not turn in all standing height While speed and the overall efficiency of the slow-speed of revolution, the working condition of large torque when in face of low rate start is also gone, therefore for traveling speed For degree can reach 60 kilometers of speed per hour or more of battery-operated motor cycle, the frequency of traditional hub motor is not enough to support multi-change speed Requirement.

At present on the market there is also some two-stage transmissions for being specifically applied to battery-operated motor cycle, but this kind of two-stage transmission Principle it is complicated, structure is larger, therefore unsatisfactory for the battery-operated motor cycle based on light.Motorcycle producer is more willing to protect The mode of chain drive or the belt transmission of system is handed down to posterity, to maintain the aesthetics of vehicle and the convenience of working service.

The applicant also earlier application cross patent " a kind of positive and negative unidirectional uniaxial two stage speed change wheel apparatus " (application number: 201820577217.2), this kind of two-stage transmission, which uses, is arranged positive and negative isolator and determines planet between input shaft and output wheel The new design of gear set, the characteristic for making full use of motor that can rotate with positive and negative direction are realized by the direction of rotation of switch motor In the same direction, two gear-stage velocity ratios of uniaxial driving output, achievees the purpose that two stage speed change.Compared to traditional battery-operated motor cycle gearbox, this Class two-stage transmission not only compact, it is versatile, and by efficient two grades of speed changes, electric efficiency may be implemented and answer Maximization takes into account the electric efficiency of high revolving speed and the slow-speed of revolution, and overcomes motor high energy consumption by low-speed big.But pass through Long-term using and finding after testing, and there is also following a few place's defects for this kind of two-stage transmission:

1, the problem of isolator idle running friction endurance: the forward and reverse isolator set due to being responsible for bottom gear and top gear It is located on same root input shaft, therefore when the work of some isolator, another isolator just will do it idle running, in this principle It is what there is no problem；But in actual application, when vehicle proceeds to high gear boost phase, input shaft passes through top gear list It is directly driven to device, the rotation of output wheel will drive sun tooth to drive bottom gear isolator in input shaft overhead by determining planet tooth Turn, if motor speed 2500rpm, then the idler revolutions for calculating bottom gear isolator reach 2500+2500*2.8(speed ratio)= 9800rpm can determine that the service life of the mechanism under this revolving speed is limited.

2, reversing problems: since two rotation directions of motor have been utilized, no matter input shaft rotate forward, reversion or high Speed, low speed, output wheel remains rotating forward, therefore this kind of second gear gearbox is that do not have hand push car-backing function in principle.

3, technology difficulty problem: since isolator needs to bear higher idler revolutions, to isolator and other sets The technique of part proposes higher requirement, is unfavorable for being mass produced.

Utility model content

It is above-mentioned existing to make up the purpose of this utility model is to provide a kind of positive and negative unidirectional coaxial two stage speed change wheel apparatus Defect present in technology.

To reach above-mentioned technical purpose and effect, the utility model is achieved through the following technical solutions:

A kind of positive and negative unidirectional coaxial two stage speed change wheel apparatus, including input shaft, driving wheel, output wheel, sun gear, determine planet Wheel determines planet wheel spindle, transition isolator, swinging block type primary one-way clutch, low speed isolator and positioning plate；

The input shaft is installed in rotation on the positioning plate, and the sun gear is arranged by a low speed isolator On the input shaft, the outer ring of the low speed isolator is fixedly connected with the sun gear, the inner ring of the low speed isolator It is fixedly connected with the input shaft, the low speed isolator is effective when the input shaft inverts, when the input shaft rotates forward Failure, the outside of the sun gear are provided with the driving wheel, and the side of the driving wheel is big opening end, and the other side is osculum End；Positioning plate described in the big opening end infinite approach of the driving wheel is bonded with the positioning plate, the osculum end of the driving wheel By being set on the input shaft by spring bearing, and the lateral surface center at the osculum end of the driving wheel is equipped with a circle For installing the output wheel mounting base of the output wheel；Several, which are provided with, between the sun gear and the driving wheel determines planet Wheel, it is each it is described determine planetary gear pass through it is corresponding it is described determine planet wheel spindle and be installed in rotation on the positioning plate, And it is each it is described determine planetary gear simultaneously engaged with the sun gear and the driving wheel；

The output end of the input shaft stretches out the driving wheel rear enclosure and is equipped with the swinging block type primary one-way clutch, described The outside of swinging block type primary one-way clutch is provided with the output wheel, the inner ring of the swinging block type primary one-way clutch and institute The output end for stating input shaft is fixedly connected, and the outer ring of the swinging block type primary one-way clutch and the inner wall of the output wheel are fixed Connection；The side of the output wheel is closed end, and the other side is open end, and the lateral surface center of the closed end of the output wheel is set It is equipped with splined shaft, the open end of the output wheel is then mounted in the output wheel mounting base by the transition isolator, institute The outer ring for stating transition isolator is fixedly connected with the open end of the output wheel, the inner ring of the transition isolator and the output The outer rim of wheel mounting base is fixedly connected；

The swinging block type primary one-way clutch is effective when input shaft high speed rotates forward, in input shaft reversion or Low speed fails when rotating forward；The transition isolator is effective when the input shaft inverts, and fails when the input shaft rotates forward；And The splined shaft, the output wheel, the driving wheel, the sun gear and the input shaft are coaxial simultaneously.

Further, the spring bearing for reducing friction is provided between the big opening end of the driving wheel and the positioning plate.

Further, the input terminal of the input shaft is directly the output end of motor shaft or the input terminal of the input shaft It is provided with the spline housing for connecting motor shaft.

Further, the outside of the driving wheel and the output wheel is provided with a box shell, and the splined shaft stretches out in Except the box shell, and spring bearing is provided between the splined shaft and the shell wall of the box shell.

Further, the box shell and the positioning plate form a confined space, are injected in the confined space Lubricating oil carries out oil sealing.

Further, described there are three settings between the sun gear and the driving wheel to determine planetary gear.

Further, three it is described determine planetary gear around the sun gear circumference in isosceles triangle distribution.

Further, to further simplify the structure, cost is reduced, it may be considered that the low speed isolator is abandoned, it is described Sun gear is directly set on the input shaft, and the driving wheel directly relies on the transition relative to the idle running of the output wheel Isolator is realized.

Firstly, simply introducing the working principle of swinging block type primary one-way clutch used by the utility model:

When the inner ring high speed rotation in one direction of swinging block type primary one-way clutch, several on inner ring get rid of block meeting It is thrown away to outer ring, final band power outer ring rotates synchronously outer ring with inner ring together, when the inner ring court for getting rid of block primary one-way clutch Same direction low speed rotation or when rotating in the opposite direction, several blocks that get rid of on inner ring will not then be thrown away outward, therefore inner ring It can not dally with power outer ring, inner ring relative to outer ring.

Secondly, simply introducing the working principle for determining planetary gear set used by the utility model:

Determine planetary gear for three to be fixed on positioning plate by determining planet wheel spindle, that is to say, that determine in the gear Planetary gear set and the design application of conventional planetary gear group are entirely different, and difference is that it is fixed for determining planetary gear for three , torsion, and the rotation by determining planetary gear are transmitted by the Hard link of positioning plate and motor, the reversion of motor is become into driving wheel Rotating forward.

Finally, introducing the working principle of the positive and negative unidirectional coaxial two stage speed change wheel apparatus of the utility model:

(1) with the two stage speed change wheel apparatus of low speed isolator

When motor reversal, driving input shaft inverts simultaneously, and low speed isolator is in effective status, transition isolator at this time In effective status, swinging block type primary one-way clutch is in failure state；On the one hand, input shaft passes through low speed isolator band power Sun gear inverts together, and sun gear determines the commutation of planetary gear by three, so that driving wheel is rotated forward, driving wheel further leads to Transition one-way wheel drives output wheel also to be rotated forward, on the other hand, since swinging block type primary one-way clutch is anti-in input shaft Failure state is in when turning, therefore swinging block type primary one-way clutch is unable to drive output wheel and is inverted, and then input shaft Reversion, which will not be formed the rotating forward of output wheel, to be interfered, and mechanism carries out low-rotate speed, high torque output, as speed change gear at this time One gear；

When needing upshift, motor stops reversion, starts high speed and rotates forward and drive input shaft while rotating forward, at this time low speed list It is in failure state to device, transition isolator is in failure state, and swinging block type primary one-way clutch is in effective status；One side Face, input shaft directly drives output wheel to carry out high speed rotating forward by swinging block type primary one-way clutch, on the other hand, due to low speed Isolator is in failure state when input shaft rotates forward, therefore input shaft dallies relative in sun gear, thus Driven wheel can not be driven to be rotated forward by determining planetary gear, torque not transmitted, further, since excessive isolator is in input shaft Failure state is also at when rotating forward, therefore when input shaft drives output wheel carrying out high speed by swinging block type primary one-way clutch When rotating forward, output wheel is equivalent to dally in the mounting base of driving wheel, to avoid the work because determining planetary gear set due to input The problem of axis positive and negative rotation contradiction, mechanism carries out high-speed direct-drive, the as second gear of speed change gear at this time.

Due to get rid of block primary one-way clutch low speed forward or reverse when be all for failure state so that this The second gear speed change gear of utility model has hand push advance or function of keeping off a car.When hand push advances, motor stops working, by defeated Wheel carries out low speed rotating forward out, gets rid of block primary one-way clutch at this time since input shaft stops operating and is in failure state, transition Isolator is as output wheel just transfers to be in failure state, therefore the low speed rotating forward of output wheel neither will drive input shaft Rotating forward will not be with the reversion of driven input shaft；When hand push reversing, motor equally stops working, and it is anti-to carry out low speed by output wheel Turn, transition isolator is in effective status because of the reversion of output wheel at this time, and driving wheel is driven to carry out low speed and reverse together, is driven Wheel then drives sun gear to rotate forward by determining planetary gear, and when sun gear rotates forward, low speed isolator is in failure state, sun gear Not will drive input shaft to be rotated forward, thus the low speed and reverse of output wheel equally neither will drive the rotating forward of input shaft will not band The reversion of driven input shaft.

(2) do not have the two stage speed change wheel apparatus of low speed isolator

When motor reversal, driving input shaft inverts simultaneously, and transition isolator is in effective status at this time, and swinging block type is primary One-way clutch is in failure state；On the one hand, input shaft drives sun gear to invert together, and sun gear determines planetary gear by three Commutation so that driving wheel is rotated forward, driving wheel further passes through transition one-way wheel and output wheel is driven also to be rotated forward, another Aspect, due to swinging block type primary one-way clutch input shaft invert when be in failure state, swinging block type primary unidirectionally from Clutch is unable to drive output wheel and is inverted, and then the reversion of input shaft will not form the rotating forward of output wheel and interfere, at this time originally Mechanism carries out low-rotate speed, high torque output, as a gear of speed change gear；

When needing upshift, motor stops reversion, starts high speed and rotates forward and drive input shaft while rotating forward, at this time transition list It is in failure state to device, swinging block type primary one-way clutch is in effective status；On the one hand, input shaft passes through swinging block type primary One-way clutch directly drives output wheel to carry out high speed rotating forward, and on the other hand, input shaft is by determining the commutation of planetary gear set, band Dynamic driving wheel is inverted, but since the rotating forward revolving speed of output wheel is high, and the reverse of driving wheel is low, and transition isolator is anti- It to surmounting, therefore is in failure state, although output wheel is rotating forward at this time, and driving wheel is being inverted, and the two is mutual Do not interfere, mechanism carries out high-speed direct-drive, and driving wheel does not transmit torque, the as second gear of speed change gear；

Due to get rid of block primary one-way clutch low speed forward or reverse when be all for failure state so that this The second gear speed change gear of utility model has hand push advance or function of keeping off a car.When hand push advances, motor stops working, by defeated Wheel carries out low speed rotating forward out, gets rid of block primary one-way clutch at this time since input shaft stops operating and is in failure state, transition Isolator is as output wheel just transfers to be in failure state, therefore the low speed rotating forward of output wheel neither will drive input shaft Rotating forward will not be with the reversion of driven input shaft；When hand push reversing, motor equally stops working, and it is anti-to carry out low speed by output wheel Turn, transition isolator is in effective status because of the reversion of output wheel at this time, and driving wheel is driven to carry out low speed and reverse together, is driven Wheel then carries out low speed rotating forward by determining planetary gear set commutation zone driven input shaft, and it is low in input shaft to get rid of block primary one-way clutch Speed is still within failure state when rotating forward, thus the low speed and reverse of output wheel equally neither will drive the rotating forward of input shaft will not Reversion with driven input shaft.

Compared with prior art, the beneficial effects of the utility model are as follows:

1, the innovative point of the utility model is to abandon the design pattern that conventional gearbox is stiff, mechanical, using variable-speed motor The new design that structure and main driving wheel are combined into one, the characteristic for making full use of motor that can rotate with both forward and reverse directions pass through switching electricity In the same direction, two gear-stage velocity ratio of linear drives output is realized in the direction of rotation of machine, achievees the purpose that two stage speed change, compared to traditional speed change The gearbox of case, the utility model has flexible Application, and versatile, compact does not account for the huge advantages such as vehicle space, right Various electric machine structures have applicability, get rid of the traditional design mode of one gearbox of a vehicle.

2, the utility model replaces existing certain battery-operated motor cycle dual-range transmissions with swinging block type primary one-way clutch Employed in low speed isolator, be subject to motor maximum speed 4000rpm, the utility model can perfection avoid low speed isolator The problem of fast idle rubs, this can not only greatly improve the service life of gear, but also also reduce the difficulty of technique Degree, is conducive to be mass produced.

4, bottom gear and top gear are replaced existing certain battery-operated motor cycles with coaxial connection type by the utility model Coaxially connected mode employed in dual-range transmission, and it is double under low speed state using swinging block type primary one-way clutch To the characteristic without power, the hand push that battery-operated motor cycle has been solved perfectly advances and hand push reversing problems.

3, the application value of the utility model is, by efficient two grades of speed changes, realizes electric efficiency application most Bigization takes into account the electric efficiency of high revolving speed and the slow-speed of revolution, and overcomes motor high energy consumption by low-speed big.It is demonstrated experimentally that this reality Battery-operated motor cycle mileage travelled about 30% can be improved with novel gearbox, largely rubbing can effectively vitalize with stock assets.

The above description is merely an outline of the technical solution of the present invention, in order to better understand the skill of the utility model Art means, and can be implemented in accordance with the contents of the specification, below on the preferred embodiment of the present invention and the accompanying drawings in detail It describes in detail bright as after.Specific embodiment of the present utility model is shown in detail by following embodiment and its attached drawing.

Detailed description of the invention

Attached drawing described herein is used to provide a further understanding of the present invention, and is constituted part of this application, The exemplary embodiment of the utility model and the description thereof are used to explain the utility model, does not constitute to the improper of the utility model It limits.In the accompanying drawings:

Fig. 1 is the cross-sectional view of the first embodiment of the utility model；

Fig. 2 is the cross-sectional view of second of embodiment of the utility model；

Fig. 3 is the cross-sectional view of the another three kinds of embodiments of the utility model.

Specific embodiment

Below with reference to the accompanying drawings and in conjunction with the embodiments, the utility model is described in detail.

Embodiment 1

It is shown in Figure 1, a kind of positive and negative unidirectional coaxial two stage speed change wheel apparatus, including input shaft 1, driving wheel 2, output wheel 3, sun gear 4, determine planetary gear 5, determine planet wheel spindle 6, transition isolator 7, swinging block type primary one-way clutch 8, low speed isolator 13 and positioning plate 9；

The input shaft 1 is installed in rotation on the positioning plate 9, and the sun gear 4 passes through a low speed isolator 13 are set on the input shaft 1, and the outer ring of the low speed isolator 13 is fixedly connected with the sun gear 4, the low speed list It is fixedly connected to the inner ring of device 13 with the input shaft 1, the low speed isolator 13 effective, In when the input shaft 1 inverts The input shaft 1 fails when rotating forward, and the outside of the sun gear 4 is provided with the driving wheel 2, and the side of the driving wheel 2 is Big opening end, the other side are osculum end；Positioning plate 9 described in the big opening end infinite approach of the driving wheel 2 is pasted with the positioning plate It closes, the spring bearing 10 for reducing friction, the driving wheel 2 is provided between the big opening end and the positioning plate 9 of the driving wheel 2 Osculum end by being set on the input shaft 1 by spring bearing 10, and the lateral surface at the osculum end of the driving wheel 2 The output wheel mounting base 11 for installing the output wheel 3 is enclosed in center equipped with one；Between the sun gear 4 and the driving wheel 2 There are three determine planetary gear 5, three described determine planetary gear 5 and surrounds 4 circumference of sun gear in isosceles triangle distribution, due to Fig. 1 for setting For cross-sectional view, thus can only show one it is described determine planetary gear 5, it is each described to determine planetary gear 5 by corresponding described Determine planet wheel spindle 6 to be installed in rotation on the positioning plate 9, and it is each it is described determine planetary gear 5 simultaneously with the sun gear 4 It is engaged with the driving wheel 2；

The input terminal of the input shaft 1 is directly the output end of motor shaft, and the output end of the input shaft 1 stretches out the biography 2 rear enclosure of driving wheel is equipped with the swinging block type primary one-way clutch 8, and the outside of the swinging block type primary one-way clutch 8 is provided with The inner ring of the output wheel 3, the swinging block type primary one-way clutch 8 is fixedly connected with the output end of the input shaft 1, described The outer ring of swinging block type primary one-way clutch 8 is fixedly connected with the inner wall of the output wheel 3；The side of the output wheel 3 is envelope Closed end, the other side are open end, and the lateral surface center of the closed end of the output wheel 3 is provided with splined shaft 12, the output wheel 3 Open end be then mounted in the output wheel mounting base 11 by the transition isolator 7, the outer ring of the transition isolator 7 It is fixedly connected with the open end of the output wheel 3, the outer rim of the inner ring of the transition isolator 7 and the output wheel mounting base 11 It is fixedly connected；

The swinging block type primary one-way clutch 8 is effective when the input shaft 1 rotates forward at a high speed, anti-in the input shaft 1 Turn or low speed rotate forward when fail；The transition isolator 7 is effective when the input shaft 1 inverts, when the input shaft 1 rotates forward Failure；And the splined shaft 12, the output wheel 3, the driving wheel 2, the sun gear 4 and the input shaft 1 are coaxial simultaneously.

Embodiment 2

It is shown in Figure 2, to further simplify the structure, reduce cost, it may be considered that abandon on the basis of embodiment 1 The low speed isolator 13, the sun gear 4 are directly set on the input shaft 1, and the driving wheel 2 is relative to the output The idle running of wheel 3 is directly realized by the transition isolator 7, the disadvantage is that the transition one-way wheel 7 needs to bear motor rotating forward When reversely surmount idle running friction, bear revolving speed determined by the speed ratio for determining planetary gear 5.

Assuming that speed ratio is 3, motor highest is 4000rpm using revolving speed, then described to determine planetary gear 5 when motor high speed rotates forward Speed reversal is 4000/3 ≈ 1200rpm, and receiving idle speed is 4000+1200=5200rpm+.Current isolator is provided From the point of view of data, it can be implemented.

Embodiment 3

It is shown in Figure 3, in order to solve the application of lubricating oil, it may be considered that in the driving wheel 2 of embodiment 2 and described The outside of output wheel 3 is provided with a box shell 14, and the splined shaft 12 stretches out in except the box shell 14, and the splined shaft 12 Spring bearing 10 is provided between the shell wall of the box shell 14, the box shell 14 forms a confined air with the positioning plate 9 Between, it is injected with lubricating oil in the confined space, carries out oil sealing.Also, spline is set by the input terminal of the input shaft 1 Set 15, for patching for motor shaft.

The above descriptions are merely preferred embodiments of the present invention, is not intended to limit the utility model, for this For the technical staff in field, various modifications and changes may be made to the present invention.It is all in the spirit and principles of the utility model Within, any modification, equivalent replacement, improvement and so on should be included within the scope of protection of this utility model.

Claims (8)

1. a kind of positive and negative unidirectional coaxial two stage speed change wheel apparatus, it is characterised in that: including input shaft (1), driving wheel (2), output Wheel (3), determines planetary gear (5), determines planet wheel spindle (6), transition isolator (7), swinging block type primary one-way clutch sun gear (4) (8) and positioning plate (9)；

The input shaft (1) is installed in rotation on the positioning plate (9), is arranged with the sun on the input shaft (1) It takes turns (4), the outside of the sun gear (4) is provided with the driving wheel (2), and the side of the driving wheel (2) is big opening end, another Side is osculum end；Positioning plate (9) described in the big opening end infinite approach of the driving wheel (2) is bonded with the positioning plate, described The osculum end of driving wheel (2) by spring bearing (10) by being set on the input shaft (1), and the driving wheel (2) The lateral surface center at osculum end be equipped with one and enclose output wheel mounting base (11) for installing the output wheel (3)；The sun It is provided with several between wheel (4) and the driving wheel (2) and determine planetary gear (5), it is each described to determine planetary gear (5) and pass through respectively It is corresponding it is described determine planet wheel spindle (6) and be installed in rotation on the positioning plate (9), and each described to determine planetary gear (5) equal It is engaged simultaneously with the sun gear (4) and the driving wheel (2)；

The output end of the input shaft (1) stretches out driving wheel (2) rear enclosure and is equipped with the swinging block type primary one-way clutch (8), the outside of the swinging block type primary one-way clutch (8) is provided with the output wheel (3), the swinging block type primary unidirectionally from The inner ring of clutch (8) is fixedly connected with the output end of the input shaft (1), outside the swinging block type primary one-way clutch (8) Circle is fixedly connected with the inner wall of the output wheel (3)；The side of the output wheel (3) is closed end, and the other side is open end, institute The lateral surface center for stating the closed end of output wheel (3) is provided with splined shaft (12), and the open end of the output wheel (3) then passes through institute It states transition isolator (7) to be mounted on the output wheel mounting base (11), the outer ring of the transition isolator (7) and the output The open end of wheel (3) is fixedly connected, and the inner ring of the transition isolator (7) and the outer rim of the output wheel mounting base (11) are fixed Connection；

The swinging block type primary one-way clutch (8) is effective when the input shaft (1) high speed rotates forward, in the input shaft (1) Reversion or low speed fail when rotating forward；The transition isolator (7) is effective when the input shaft (1) inverts, in the input shaft (1) it fails when rotating forward；And the splined shaft (12), the output wheel (3), the driving wheel (2), the sun gear (4) and institute It is coaxial simultaneously to state input shaft (1).

2. positive and negative unidirectional coaxial two stage speed change wheel apparatus according to claim 1, it is characterised in that: the sun gear (4) Be set on the input shaft (1) by a low speed isolator (13), the outer ring of the low speed isolator (13) and it is described too Sun wheel (4) is fixedly connected, and the inner ring of the low speed isolator (13) is fixedly connected with the input shaft (1), and the low speed is unidirectional Device (13) is effective when the input shaft (1) inverts, and fails when the input shaft (1) rotates forward.

3. positive and negative unidirectional coaxial two stage speed change wheel apparatus according to claim 1, it is characterised in that: the driving wheel (2) Big opening end and the positioning plate (9) between be provided with reduce friction spring bearing (10).

4. positive and negative unidirectional coaxial two stage speed change wheel apparatus according to claim 1, it is characterised in that: the input shaft (1) Input terminal be directly the output end of motor shaft or the input terminal of the input shaft (1) is provided with flower for connecting motor shaft Key set (15).

5. positive and negative unidirectional coaxial two stage speed change wheel apparatus according to claim 1, it is characterised in that: the driving wheel (2) The outside of the output wheel (3) is provided with a box shell (14), the splined shaft (12) stretches out in except the box shell (14), And spring bearing (10) are provided between the splined shaft (12) and the shell wall of the box shell (14).

6. positive and negative unidirectional coaxial two stage speed change wheel apparatus according to claim 5, it is characterised in that: the box shell (14) with The positioning plate (9) forms a confined space, and lubricating oil is injected in the confined space, carries out oil sealing.

7. positive and negative unidirectional coaxial two stage speed change wheel apparatus according to claim 1, it is characterised in that: the sun gear (4) Setting determines planetary gear (5) there are three described between the driving wheel (2).

8. positive and negative unidirectional coaxial two stage speed change wheel apparatus according to claim 7, it is characterised in that: three described to determine planet It takes turns (5) and is distributed around the sun gear (4) circumference in isosceles triangle.