CN2717810Y

CN2717810Y - Speed changer for electric bicycle instead of walk

Info

Publication number: CN2717810Y
Application number: CN 200420066114
Authority: CN
Inventors: 黄鹏宇
Original assignee: Individual
Current assignee: Individual
Priority date: 2004-06-18
Filing date: 2004-06-18
Publication date: 2005-08-17
Anticipated expiration: 2014-06-18

Abstract

The utility model discloses a speed changer for an electric bicycle instead of walk. It is composed of a motor seat, a motor, a driving motor group on a motor rotating shaft, a driven motor group connected with the driving motor group, a belt pulley pivoting on the driving shaft of the driven motor group and a belt, wherein, the driving motor group is constituted by a bull wheel and a pinion wheel which are in turnin synchronism. The driven motor group comprises a bull wheel and a pinion wheel, a driving shaft and a flywheel gear arranged on the driving shaft. The small gear wheel is formed together with a flywheel cap, and a both-way bearing is arranged in an axle hole and pivots at one end of the driving shaft. A one-way bearing is arranged in the axle hole of the bull wheel and pivots at the other end of the driving shaft. The one-way bearing enables the bull wheel to drive the driving shaft to rotate when the bull wheel rotates. When the rotation speed of the driving shaft is higher than that of the bull wheel, the bull wheel gets the differential speed function. In this way, uplifting the rotation speed of the motor makes the flywheel move, and the rotation speed of the driving shaft exceeds the rotation speed of the motor so as to change the rotation speed of the belt pulley, which makes the electric bicycle instead of walk have the function of two sections of speed changing.

Description

The electric cycle transmission system

Technical field

The utility model relates to a kind of electric cycle transmission system, refer to especially a kind of can be along with the lifting of motor rotary speed can automatic speed changing (gear shift) device, it applies on the electric cycle, so that electric cycle has low speed torsion and high-performance cruise ability concurrently.

Background technology

Electric cycle is popularized day by day, and it is arranged on the car of riding instead of walk by motor, and saves many manpowers; The motor of early stage electric cycle is to send power on the drive wheel via gear case or belt, and motor can not be done the switching of gear shift, and its speed of a motor vehicle is to be controlled by motor rotary speed, and rotating speed is increased or reduces with size of current.

No. the 549007th, TaiWan, China patent announcement " electric cycle exchange of notes part transmission system " for example, this shift transmission is made up of a shell block, a Power Component, a transmission component, a takeoff output assembly and a belt, and change the gear ratio by the driving lever of stirring in the transmission component, have torsion so that ride instead of walk during car low speed, and the speed of a motor vehicle during high speed also can be than comparatively fast.

In gear transmission structure, driving big gear wheel with miniature gears is to allow clutch end have lower rotating speed (miniature gears commentaries on classics N circle, big gear wheel is just changeed 1 circle) (the big gear wheel diameter is bigger to reach bigger torsion, moment is also big, so miniature gears can drive the big gear wheel rotation easily, power end load just is lighter), therefore be the gear ratio that is fit to very much vehicle start; Otherwise, be to allow clutch end have high rotational speed (big gear wheel is changeed 1 circle, and miniature gears changes the N circle) so that the large gear turn the small gear, but miniature gears moment is little, the event big gear wheel needs drive miniature gears more arduously, is not suitable for starting and uses, and can only be applicable to the speed that promotes the middle vehicle that travels.

And tradition is by the electric cycle of the motor rotary speed control speed of a motor vehicle, because the gear case internal tooth is than fixing, so the takeoff output performance can only be set in an equilibrium point, be that torsion reaches the consistent operational requirements that just satisfied with speed, car can't advance in the startup after-acceleration so ride instead of walk, also can't in advancing, move forward fast, the starting difficulty will take place when operator's body weight heavier (as the fat person) thus, run unhappy defective after the starting again.

Preceding again case is announced No. 549007 and is the head it off point, is provided with variable tooth ratio device in change speed gear box, and changes the tooth ratio by the control of driving lever, but its shortcoming is higher, the complex structure of change speed gear box design cost, and with manual mode of operation, do not have a convenience, increase on the contrary and use trouble.

Novel content

The purpose of this utility model is to provide a kind of lifting by motor rotary speed to make flywheel action, and makes drive shaft speed surmount motor rotary speed and reach the change pulley speed, so that electric cycle has the electric cycle transmission system of two sections speed changing functions.

For achieving the above object, structure of the present utility model is as follows: a kind of electric cycle transmission system, its by motor seat, motor, wear driven wheels that pivot is connected in the driving wheel group on the motor shaft, with driving wheel group, wear belt pulley and the belt of pivot on driven wheels axle drive shaft and formed, it is characterized in that: driving wheel group is connected with the staggered corresponded manner of large and small gear with driven wheels, and driven wheels include an axle drive shaft, are located at large and small two gears, a flywheel gear of being located on the axle drive shaft on the axle drive shaft; Described miniature gears and flywheel lid are integrally formed, and wear pivot at axle drive shaft one end by the two-way bearing in the axis hole; Big gear wheel is worn pivot at the axle drive shaft other end, is provided with in its axis hole to drive drive shaft turns when big gear wheel is rotated, and when drive shaft speed is higher than the big gear wheel rotating speed, can produce to dally and make big gear wheel have the unilateral bearing of differential function; When also being provided with action between axle drive shaft and the flywheel lid axle drive shaft and flywheel lid are combined into one, make the flywheel gear of axle drive shaft and flywheel lid with rotating speed.

Simultaneously, flywheel gear is by two fixed plates that have in the residing flywheel lid of axle drive shaft, junction between two fixed plates is provided with two grooves up and down, be equipped with spring respectively, there are two fixture blocks to lay respectively at the fixed plate both sides again and are floating between two fixed plates, and drawn close by the roof pressure of spring and fixed plate and constitute by bolt.

Simultaneously, arrangement of clutch is made of the recessed rank Ka Bi that can cooperate with the fixture block of flywheel gear in the flywheel lid.

Effect of the present utility model: constitute driving wheel group on motor shaft, it is connected with the staggered corresponded manner of large and small gear with driven wheels; Again, miniature gears in the driven wheels and flywheel lid are integrally formed, and wear pivot at axle drive shaft one end, to have differential function by the two-way bearing in the axis hole; Be provided with unilateral bearing in the big gear wheel axis hole and wear pivot at the axle drive shaft other end, this unilateral bearing drives drive shaft turns when big gear wheel is rotated, but when drive shaft speed is higher than the big gear wheel rotating speed, can make big gear wheel have differential function.

When electric cycle was started to walk, motor rotary speed began to rise, the torsion when this moment, the driving wheel group miniature gears drove driven wheels big gear wheel with the performance starting, and driven wheels miniature gears is driven by the driving wheel group big gear wheel, presents the state that rotating speed is higher than axle drive shaft; When the motor rotary speed height to making flywheel when action, flywheel on the axle drive shaft can engage with the flywheel lid, make drive shaft speed identical with driven wheels miniature gears, this moment axle drive shaft the rotating speed of rotating speed driven wheels big gear wheel can far exceed original flywheel and do not move the time, thereby have two sections automatic speed changing functions.

Enforcement of the present utility model can be obtained following advantage at least:

1. the speed when torsion when this transmission system can make electric cycle have starting, low speed simultaneously concurrently and lifting high speed.

2. this transmission system can change the tooth ratio automatically along with the lifting of motor rotary speed, need not manual operation, so very easy to use.

3. this transmission system mainly is that an arrangement of clutch is set, because simple structure, so assembling and maintenance are easily, and manufacturing cost more can reduce.

Description of drawings

Fig. 1: the schematic perspective view that the utility model combines with the car of riding instead of walk.

Fig. 2: three-dimensional exploded view of the present utility model.

Fig. 3: the three-dimensional exploded view of the driven wheels of the utility model.

Fig. 4: the utility model and the start of electric walk instead back wheels of vehicle concern scheme drawing.

Fig. 5: full sectional view of the present utility model.

Fig. 6: the scheme drawing before the utility model speed change.

Fig. 7: the scheme drawing after the utility model speed change.

The specific embodiment

Following according to detailed description of the embodiment shown in the drawing as back:

As shown in Figure 1, the schematic perspective view that combines with electric cycle for the utility model, disclosing a transmission system 20 among the figure is to be arranged on the rear arm 11 of the car 10 of riding instead of walk by motor seat 21, and overlap on the belt pulley 121 of the belt pulley 25 of transmission system 20 and the back wheels of vehicle 12 of riding instead of walk with belt 26, the takeoff output that makes motor 22 in view of the above is to trailing wheel 12, advance with the order car 10 of riding instead of walk, and make it have two sections speed changing functions.

As shown in Figure 2, be three-dimensional exploded view of the present utility model, by learn among the figure transmission system 20 by one be fixed on motor 22, that motor seat 21, on the vehicle frame is fixed on motor seat 21 wear driving wheel group 23, the driven wheels that with driving wheel group 23 are connected 24, of pivot on motor shaft 221 wear pivot the belt pulley 25 of driven wheels axle drive shaft 243 ends, and a belt 26 that drives by belt pulley 25 formed.

In aforementioned, driving wheel group 23 is made of big gear wheel 231 and miniature gears 232, two-wheeled is coaxial and can rotate synchronously, and, miniature gears 242,241 24 big with driven wheels is connected (can consult Fig. 5) with staggered corresponded manner, because driven wheels 24 are coaxial with axle drive shaft 243, driving wheel group 23 is coaxial with motor shaft 221, add driving wheel group 23 big miniature gearss for rotating synchronously, based on the gear transmission principle, must possess differential function between the gear of driven wheels 24 could be connected cooperation with driving wheel group 23, and this differential function is in hereinafter will further narrating.In addition, driven wheels 24 are to be hubbed in the axis hole 211 of motor seat and to be combined with bearing 212 by axle drive shaft 243.

As shown in Figure 3, be the three-dimensional exploded view of the driven wheels of the utility model, driven wheels 24 are made up of a miniature gears 241, a big gear wheel 242, an axle drive shaft 243 and one group of flywheel gear 240.Wherein, miniature gears 241 is integrally formed with flywheel lid 241a, and it wears pivot at axle drive shaft 243 1 ends by the two-way bearing 241d in the axis hole 241b, to obtain differential function; Be provided with unilateral bearing 242b in the axis hole 242a of big gear wheel 242 and wear pivot at axle drive shaft 243 end in addition, this unilateral bearing 242b drives axle drive shaft 243 and rotates when big gear wheel 242 is rotated, dally and make big gear wheel 242 have differential function but can produce when axle drive shaft 243 rotating speeds are higher than big gear wheel 242 rotating speeds.

In addition, have two fixed plate 243a in the axle drive shaft 243 residing flywheel lid 241a, junction between two fixed plates is provided with up and down, and two groove 243b can distinguish putting spring 244, two fixture blocks 245 are floating between the two fixed plate 243a in fixed plate 243a both sides and by bolt 246 again, and be subjected to the effect of spring 244 and draw close with fixed plate 243a, this i.e. a representative type flywheel gear.

When axle drive shaft 243 high speed revolutions produce centnifugal force greater than spring 244 poundages, fixture block 245 can be thrown away, and clip covers recessed rank card wall 241c in the 241a to flywheel under the state of rotation, making flywheel lid 241a and axle drive shaft 243 produce synchronously rotates, form an arrangement of clutch, its operating principle will be in the back narration.

As shown in Figure 4, for the utility model and the back wheels of vehicle start of riding instead of walk concern scheme drawing, can drive driven wheels 24 when learning among the figure that driving wheel group 23 rotates in a counter-clockwise direction and axle drive shaft 243 rotates in a clockwise direction, and belt pulley 25 is to be fixedly arranged on axle drive shaft 243 ends, so its rotating speed is permanent identical with axle drive shaft 243; Again, belt pulley 25 sees through belt 26 power is reached on the belt pulley 121 of trailing wheel 12, and trailing wheel 12 is able to right-hand revolution, and the car of riding instead of walk is advanced, and the speed of a motor vehicle of learning the car 10 of riding instead of walk thus is that the rotating speed by axle drive shaft 243 is determined.

As Fig. 6, shown in Figure 7, be respectively before the utility model speed change and the scheme drawing after the speed change, and please cooperate shown in Figure 5 simultaneously with the whole speed-change process of further understanding, suppose that motor 22 maximum speed of revolutions are 4,200rpm, driving wheel group 23 is big, miniature gears is respectively 30 teeth and 20 teeth, driven wheels 24 are big, miniature gears is respectively 30 teeth and 20 teeth, fixture block 245 on the axle drive shaft 243 is 4 at motor 22 rotating speeds, 200rpm or axle drive shaft 243 rotating speeds are 2, can be thrown away during 800rpm (big gear wheel 242 of driven wheels is 1: 1.5 with the gear ratio of driving wheel group miniature gears 232) and the recessed rank card wall 241c of clip in the flywheel lid 241a, and then combine synchronously with flywheel lid 241a and to rotate.

When the user is risen motor 22 rotating speeds to 3 by 0rpm control, during 000rpm, the miniature gears 232 and big gear wheel 231 rotating speeds of driving wheel group 23 are all 3,000rpm, and the rotating speed of the miniature gears 242 of driven wheels 24 and axle drive shaft 243 is 2,000rpm is (because of

miniature gears

242 and 243 of axle drive shafts are provided with unilateral bearing 242b, so both rotating speeds are identical), rotating speed is 4 to driven again wheels miniature gears 241 (comprising flywheel lid 241a) to be subjected to driving wheel group big gear wheel 231 to drive down, 500rpm, and because motor 22 and the axle drive shaft 243 rotating speeds start rotating speed of Dacca piece 25 not, therefore miniature gears 241 can be different with axle drive shaft 243 and big gear wheel 242 rotating speeds by the effect of two-way bearing 241d, reach differential effect.

Continue to improve the rotating speed to 4 of motor 22 as the operator, during 200rpm, fixture block 245 starts, the miniature gears 241 of driven wheels is engaged with axle drive shaft 243, the rotating speed that is both can become identical, and this moment miniature gears 241 and axle drive shaft 243 rotating speed can arrive 6,300rpm is (because of tooth ratio relation, driving wheel group big gear wheel 231 is changeed 1 circle, driven wheels miniature gears 241 can change 1.5 circles), but driven wheels big gear wheel 242 is subjected under the drive of driving wheel group miniature gears 232, rotating speed maintains 2,800rpm (unilateral bearing 242b is idling conditions at this moment) can not get caught up in the rotating speed of axle drive shaft 243, and this is that idle running effect by unilateral bearing 242b makes miniature gears 242 and axle drive shaft 243 produce differential effect.

As from the foregoing, the maximum speed of revolution of speed change drive axle 243 only can reach 2, and 800rpm but can reach 6 after the speed change, and 300rpm makes the car 10 of riding instead of walk possess the required torsion of low speed simultaneously, and higher very fast.

More than, the preferred embodiment according to shown in graphic has been described in detail the utility model; But those skilled in the art can carry out various equivalence changes in not surmounting the utility model spirit scope, no matter how it changes, such as at the various change embodiment that do not exceed in the essential scope, all should contain and belong in the utility model category.

Claims

1. electric cycle transmission system, its by motor seat, motor, wear driven wheels that pivot is connected in the driving wheel group on the motor shaft, with driving wheel group, wear belt pulley and the belt of pivot on driven wheels axle drive shaft and formed, it is characterized in that:

Driving wheel group is connected with the staggered corresponded manner of large and small gear with driven wheels, and driven wheels include an axle drive shaft, are located at large and small two gears, a flywheel gear of being located on the axle drive shaft on the axle drive shaft; Described miniature gears and flywheel lid are integrally formed, and wear pivot at axle drive shaft one end by the two-way bearing in the axis hole; Big gear wheel is worn pivot at the axle drive shaft other end, is provided with in its axis hole and drives drive shaft turns when big gear wheel is rotated, and when drive shaft speed is higher than the big gear wheel rotating speed, can produces and dally and make big gear wheel have the unilateral bearing of differential function; When also being provided with action between axle drive shaft and the flywheel lid axle drive shaft and flywheel lid are combined into one, make the flywheel gear of axle drive shaft and flywheel lid with rotating speed.

2. electric cycle transmission system as claimed in claim 1, it is characterized in that: flywheel gear is by two fixed plates that have in the residing flywheel lid of axle drive shaft, junction between two fixed plates is provided with two grooves up and down, be equipped with spring respectively, there are two fixture blocks to lay respectively at the fixed plate both sides again and are floating between two fixed plates, and drawn close by the roof pressure of spring and fixed plate and constitute by bolt.

3. electric cycle transmission system as claimed in claim 1 is characterized in that: arrangement of clutch is made of the recessed rank Ka Bi that can cooperate with the fixture block of flywheel gear in the flywheel lid.