CN2306946Y

CN2306946Y - Differential type auxiliary pedal power transmission for electric bicycle

Info

Publication number: CN2306946Y
Application number: CN97222326U
Authority: CN
Inventors: 曾鼎煌
Original assignee: MEILIDA INDUSTRY Co Ltd
Current assignee: MEILIDA INDUSTRY Co Ltd
Priority date: 1997-07-31
Filing date: 1997-07-31
Publication date: 1999-02-10
Anticipated expiration: 2007-07-31

Abstract

The utility model relates to a differential type auxiliary pedal power transmission for an electric bicycle, the transmission way of the utility model is set into the gear differential transmission type. By utilizing the differential transmission of gears, not only the wear of the transmission parts can be reduced owing to the acceleration characteristic of the differential speed ratio to extend the service life of the parts, but the manufacture cost can be saved owing to the fixedness of the transmission parts of the utility model, so the utility model is designed into a noncontact device of sensing the torsion and the speed, the differential gear group generates the torsion signals owing to sensing the value of the reaction force to combine the rotary speed to test, and the power auxiliary effects with different transmission types and low cost can be provided by the utility model. The utility model has the advantages of simple structure, long service life and low cost, and is suitable for popularizing in the cyclists.

Description

The differential type of Electrical Bicycle is assisted the legpower driving device

The utility model relates to a kind of driving device of Electrical Bicycle, refers in particular to a kind of differential type transmission structures.

Light bicycle in the vehicle owing to have both motion, characteristic light, free from environmental pollution, makes the industrial Chang Sheng of bicycle not wane, and opens up the bicycle special lane especially with advanced country especially and is advocated.The product kenel development of bicycle is more multiple, has begun Electrical Bicycle in vogue at present, with the auxiliary foot-operated legpower of the Electronmotive Force of motor, provides the more comfortable light effect of riding.The Electrical Bicycle of at present existing sensing torsion, speed, " with the bicycle of electrical motor " as No. 267137, Taiwan patent, legpower testing agency and the speed of a motor vehicle testing agency of detecting legpower wherein are set, and the controller of control motor power, reach controller when detecting signal, just change the size of motor power by controller.

Furtherly, the transmission device of this case is by pedal input rotation, through crank, free-wheel clutch and transmission planetary wheel booster engine, legpower testing agency is the antagonistic force by the sun gear that forces in sun and planet gear, learn the strength that manpower is trampled by the rotation amount of test rod, and speed of a motor vehicle testing agency is by detecting the rotating speed of speed reduction gearing, two testing results being reached controller, the output at control motor again.But the structure of this case has its shortcoming to exist;

First, the drive mechanism of planetary gear type, complex structure, requirement working accuracy height causes each gear that the relation of leading a global launch is arranged mutually, and number of teeth configuration all needs to calculate appropriate to each other, especially desire is set the revolution ratio of certain value, then the number of teeth of all gears all needs totally to revise obtaining optimal needs, so manufacturing cost is higher, and easily price is married again to the customer.

Second, the element of legpower testing agency is many and complicated, its be by the swing offset quality entity of testing agency touch after the potential device, beginning is surveyed the result who learns legpower by potential device, therefore the sensing of contact design repeatedly, more easily cause the problem of wearing and tearing, abrasion, the life-span of testing agency, potential device is shorter.

Main purpose of the present utility model provides a kind of simple in structure, and is easy to manufacture, the auxiliary legpower driving device of the differential type of the long service life and the Electrical Bicycle that can reduce production costs.

The technical scheme that realizes the utility model purpose is: a kind of differential type of Electrical Bicycle is assisted the legpower driving device, the battery box and relevant computer, the controller that comprise the feed motor electric power that is fixedly arranged on vehicle frame, one settles the room of the body interior formation of motor, run through one day axle of establishing at body, they axle two ends connect crank, the pedal of establishing, the controller of exerting oneself with the control motor of the signal input that detects for torsion, speed that is provided with in the body is characterized in that:

The axle of motor picks out a helical wheel, to mesh another helical wheel, room is that fitted bearing is to assemble a driving bevel gear at place's sidewall of the adjacent side of relative motor spindle, it is that an end is the umbrella profile of tooth, the axle head of end is sheathed for a unilateral bearing in addition, cooperate again by the coaxial unilateral bearing outer circumferential side that is set in of helical wheel, make driving bevel gear preparation and bevel ratchet wheel orthogonal engagement

This bevel ratchet wheel is in conjunction with large fluted disc, can link a day axle simultaneously,

The differential type gear drive comprises drive link, reaction bevel gear, transmission bevel gear, the Drive ratchet seat, wherein,

The at one end coaxial sheathed reaction bevel gear of it axle, the reaction bevel gear is the plane at the face in addition of umbrella tooth, the outside one end vertically is equipped with projection, another side is for supporting piece, with the piece that supports at the reaction bevel gear, the torque spring of horizontal one Ω shape in the projection scope, be equipped with two blocks at body towards the torque spring end face, the one, the retaining briquetting is against torque spring one end pin, and another is the contrary backing block of stepping on, it pastes and supports the projection side, and torque spring other end pin and torque spring one end blocking, support piece in the bottom surface an affixed torque sensing sheet, radially locating is the torque sensor that is locked on body towards, be contactless induction form

The adjacent reaction bevel gear of it axle is solid cover one drive link, drive link two ends extended spot respectively is arranged with the transmission bevel gear, the transmission bevel gear can with reaction bevel gear flank engagement, the adjacent drive link of it axle is and a sheathed Drive ratchet seat, it is a umbrella tooth, at the solid velocity response sheet of outer circumferential side cover, make its outer peripheral face towards a speed sensor that is locked on body, the end of the adjacent velocity response sheet of Drive ratchet seat, be arranged with more than one ratchet in the outside, click-fit spring button and anchoring at Drive ratchet seat periphery, in the ratchet outside is the engaging bevel ratchet wheel, its be a umbrella tooth at one end in recess form ratchet face, the end outside is affixed with large fluted disc in addition, making ratchet is that the ratchet face of bevel ratchet wheel one end madial wall is in peripheral snap, the umbrella flank of tooth of bevel ratchet wheel and driving bevel gear engagement, use and constitute differential type gear transmission structure, sensing torsion and speed

Bevel ratchet wheel, this bevel ratchet wheel is in conjunction with large fluted disc, can link a day axle simultaneously, makes day axle combination gear modified roll mechanism and relevant sensing structure;

In the auxiliary legpower driving device of the differential type of above-mentioned Electrical Bicycle:

One end of the relative reaction bevel gear of it axle can run through body, and in addition end cooperate enclosing cover to be covered with sealing at this end opening, and spacer one bearing is located between day axle one end and the body then by body openings with clasp, and right overhead is being coupling in addition a sheathed clasp and is locating;

But the cooresponding inner ring surface flank of tooth of drive link, a day axle relative position then is a gear hobbing face, makes the drive link engagement be one;

The velocity response sheet is a whole ring, equidistantly cuts open at periphery and is provided with separate slot, and staying surplus equidistant axial vane surface is sensitive surface;

Ratchet can anchor at the Drive ratchet seat at outer circumferential side matching ring button one spring buckle;

Bevel ratchet wheel is outside outside thread at one end, and screws togather with large fluted disc;

But bevel ratchet wheel one end inboard is spacer one bearing when being set in day axle, opening anchor ring cover at enclosing cover can be provided with bearing, be located at body with cover lock outside and seal inside, form the bearing inner ring face and be set in the outside of bevel ratchet wheel, and between sky axle and bevel ratchet wheel, fill in an oil sealing.

The utility model compared with the prior art advantage and good effect is very obvious.By above technical scheme as can be known, utility model has the following advantages:

1. the utility model utilizes the differential type gear transmission structure, mechanism as torsion and speed sensitive, simpler and easy in design and manufacturing, and do not resemble existing planetary gear system complexity and high manufacturing accuracy requirement, the utility model can get cost-cutting effectively relatively.

2. differential of the present utility model can not change because of the increase and decrease of the number of teeth, yet if existing drive mechanism is for to reach identical revolution ratio, wherein the number of teeth has change than for definite value, and the gear of planetary gear train needs to revise totally, very trouble.

3. the induction of torsion, speed is contactless, and the form by sensing chip covers inductor because of no frictional loss, can increase the service life.

Further specify specific structural features of the present utility model and purpose below in conjunction with accompanying drawing.

Brief Description Of Drawings:

Fig. 1 is that the integral body of the utility model embodiment is in conjunction with cutaway view.

Fig. 2 is the whole binding end view among Fig. 1 embodiment.

Fig. 3 is reaction bevel gear, torque spring and the body disposition plan among Fig. 1 embodiment.

Fig. 4 is reaction bevel gear, torque spring and the body elements exploded drawings among Fig. 1 embodiment.

Fig. 5 is the torque sensor among Fig. 1 embodiment and the configuration schematic isometric of torque sensing sheet.

Fig. 6 is that the Drive ratchet seat among Fig. 1 embodiment combines cutaway view with bevel ratchet wheel.

Fig. 7 is the velocity response end sectional view partly among Fig. 1 embodiment.

Fig. 8 is a motion flow scheme drawing of the present utility model.

The utility model is the auxiliary legpower driving device of a kind of differential type of Electrical Bicycle; its general structure; be provided in a side of down pipe and Chain stay delivery position, periphery has the guard shield protection, and elements such as the battery box of feed motor electric power and relevant computer, controller then cooperate and are fixedly arranged on vehicle frame.

Please earlier referring to Fig. 1,2, body 22 1 end interlocking motors 40, body 22 open ends are combined with enclosing cover 14, with the back encapsulation that finishes in assembling, in the body 22 inner rooms 43 that form relatively, so that speed reduction gearing and drive mechanism, sensing device to be set.

Configuration such as Fig. 1,2 partly slows down, axle by motor 40 picks out a little helical wheel (diagram is not seen), and after meshing another helical wheel 44, room 43 is that fitted bearing 42 is to assemble a driving bevel gear 41 at place's sidewall of the adjacent side of relative motor 40 axles, it is that an end is the umbrella profile of tooth, the axle head of end is sheathed for a unilateral bearing 20 in addition, cooperates by helical wheel 44 coaxial unilateral bearing 20 outer circumferential sides that are set in again, and makes driving bevel gear 41 preparations and the engagement of a bevel ratchet wheel 17 orthogonals;

Continuing and see Fig. 1,2, is to reach bevel ratchet wheel 17 through deceleration position power, and this bevel ratchet wheel 17 is in conjunction with large fluted disc 13, can link day axle 34 simultaneously, makes day axle 34 combination gear modified roll mechanisms and relevant sensing structure.

Wherein, they axle 34 1 ends are to run through body 22, end is by body 22 openings in addition, cooperate enclosing cover 14 to be covered with sealing at this end opening, and be that spacer one bearing 29 is with clasp 35 location between day axle 34 1 ends and the body 22, its axle 34 is a sheathed clasp 31 and locating in addition then, as Fig. 2,3, shown in 4, a coaxial sheathed reaction bevel gear 27, reaction bevel gear 27 is a gear hobbing face 273 establishing this face of umbrella tooth, face is the plane in addition, the outside one end vertically is equipped with projection 271, another side is for supporting piece 272, to support piece 272 at reaction bevel gear 27, the torque spring 28 of horizontal one Ω shape in projection 271 scopes, for locating torque spring 28, be equipped with two blocks at body 22 towards torque spring 28 end faces, the one, retaining briquetting 221, for torque spring 28 1 end pin against, another is the contrary backing block 222 of stepping on, it pastes and supports projection 271 sides, and supply torque spring 28 other end pin with it by system, establish a torque sensing sheet 37 in the bottom surface with screw 36 spiral shells and support piece 272, please referring to Fig. 2,3,5, torque sensing sheet 37 is vertical sheet, and radially locating is towards a torque sensor 39 that is locked on body 22 (cooperating screw 38 locks to establish among the figure), be to adopt contactless induction form, torque sensor 39 includes the magnetic patch that coats copper cash, produce vortex flow thus and with 37 inductions of torque sensing sheet, this torque sensor 39 is prior arts;

Secondly, the gear hobbing face 273 of reaction bevel gear 27 on sky axle 34, it is the transmission bevel gear 26 that engagement one is installed in drive link 23 2 ends, drive link 23 cooresponding inner ring surfaces are flank of tooth, be meshed with the sky axle 34 outer flank of tooth and be one, drive link 23 two ends extended spots respectively are arranged with transmission bevel gear 26, transmission bevel gear 26 be able to reaction bevel gear 27 flank engagement; They axle 34 adjacent drive links 23 are and a sheathed Drive ratchet seat 25, it is a umbrella tooth, at outer circumferential side such as Fig. 2, it shown in 7 the solid velocity response sheet 18 of cover, velocity response sheet 18 is whole rings, equidistantly cut open at periphery and to be provided with separate slot 181, staying surplus equidistant axial vane surface is sensitive surface 182, is that lock is established a speed sensor 19 at body 22 towards velocity response sheet 18, the end of Drive ratchet seat 25 adjacent velocity response sheets 18 is for another Fig. 2, shown in 6, be arranged with two ratchets 15 in the outside, ratchet 15 cooperates spring buckle 16 and anchors at Drive ratchet seat 25, in ratchet 15 outsides are desire engaging bevel ratchet wheels 17, it is that the at one end interior recess of a umbrella tooth forms ratchet face 171, the end outside is an outside thread 172 in addition, therefore ratchet 15 is that the ratchet face 171 of bevel ratchet wheel 17 1 end madial walls is in peripheral snap, the umbrella flank of tooth of bevel ratchet wheel 17 and driving bevel gear 41 engagements, other holds then spacer one bearing 12 when being set in day axle 34 of inboard, at last, opening anchor ring at enclosing cover 14 is arranged with bearing 10, enclosing cover 14 is locked on body 22 seals inside, and formation bearing 10 inner ring surfaces are set in the outside of bevel ratchet wheel 17, and the outside thread 172 of bevel ratchet wheel 17 is promptly established binding for large fluted disc 13 spiral shells, large fluted disc 13 exposes to outside the body 22, and fill in oil sealing 11 in

sky axle

34 and 17 of bevel ratchet wheels, they axle 34 two ends are affixed cranks, the assembling of crank is existing structure, more than is the single-piece assembling instruction.

Fig. 8 is a motion flow simplified schematic diagram of the present utility model, torque sensor and the detectable power of rotating speed inductor, step on foot-operated crank by the bicyclist and reach torsion and the rotation speed change that the equalizing gear induction mechanism is reacted, and the signal that is elicited reached controller, controller then can be controlled motor and export suitable rotating speed, and exert oneself synchronously with manpower, drive bicycle and advance.

The single-piece use is promptly as described below:

People's foot pedal is to drive crank, legpower is passed to day axle 34, be with drive link 23 rotations, as shown in Figure 2, differential type transmission characteristic of the present utility model is the configuration that comprises drive link 23, transmission bevel gear 26, Drive ratchet seat 25 and reaction bevel gear 27; In brief: drive link 23 rotating speeds of Drive ratchet seat 25 rotating speeds+reaction bevel gear 27 rotating speeds=2 times.

According to this revolution ratio relation, when legpower place low resistance, a day axle 34 is being with drive link 23 rotations, and transmission bevel gear 26 is except that rotating around drive link 23, and makes circumference along reaction bevel gear 27 flank of tooth and rotate, and reaction this moment bevel gear 27 is to be motionless state; So the resistance that causes when foot-operated power is big, then can make transmission bevel gear 26 urge reaction bevel gear 27 a little, make the projection 271 of reaction bevel gear 27 urgent torque spring 28, and torque spring 28 two ends are limited by contrary backing block 222 and the retaining briquetting 221 (as Fig. 3) stepped on, can only make reaction bevel gear 27 do low-angle rotation, bestow the torsion of reaction bevel gear 27 this moment, by torque spring 28 balances, jointly, fixing torque sensing sheet 37 also moves, detect 37 revolutions of torque sensing sheet by this amount of movement and cover displacement, reflect the sizes values of torsion;

At this moment, reaction bevel gear 27 is quiescence because of torsion balance, cause the rotation speed operation of Drive ratchet seat 25 with 2 times of drive links 23, and power reached bevel ratchet wheel 17, speed sensor 19 is rotation speed relation therefore, and by covering relation with the sensitive surface 182 of velocity response sheet 18, survey signal to change, react the revolution rotating speed of bicyclist's foot-operated crank at that time.

When torque sensor 39, speed sensor 19 transfer to controller with signal, shown in Fig. 1,8, calculate the voltage that output is fit to by controller in-to-in program, the transmission of CD-ROM drive motor 40 and process helical wheel 44, driving bevel gear 41, and power is reached bevel ratchet wheel 17 rotations sheathed with day axle 34, then electric power just can rotate to drive large fluted disc 13 in conjunction with manpower by bevel ratchet wheel 17, makes the trailing wheel of bicycle rotate the power needs that are fit to current auxiliary legpower to provide by chain then;

Otherwise, if motor 40 is cut off the electricity supply, and when having only manpower output legpower, because unilateral bearing 20 is located at 44 of driving bevel gear 41 and helical wheels, make day axle 34 so step on crank, large fluted disc 13 transmissions, cooperate shown in Figure 6, ratchet 15 makes Drive ratchet seat 25 drive bevel ratchet wheel 17 with ratchet face 171 blockings, 41 rotations of bevel ratchet wheel 17 engagement driving bevel gears, and this moment, driving bevel gear 41 was in idling conditions because of the disengaging of unilateral bearing 20, unlikely drive motor 40, if when stepping on, then ratchet 15 breaks away from ratchet face 171, and Drive ratchet seat 25 can not drive bevel ratchet wheel 17 and rotate, and be idling conditions, to guarantee the comfortable stability of cycling.

Claims

1. the differential type of an Electrical Bicycle is assisted the legpower driving device, the battery box and relevant computer, the controller that comprise the feed motor electric power that is fixedly arranged on vehicle frame, one settles the room of the body interior formation of motor, run through one day axle of establishing at body, they axle two ends connect crank, the pedal of establishing, what the signal for torsion, speed detection that is provided with in the body was imported can control the controller that motor is exerted oneself, and it is characterized in that:

Bevel ratchet wheel, this bevel ratchet wheel is in conjunction with large fluted disc, can link a day axle simultaneously, makes day axle combination gear modified roll mechanism and relevant sensing structure.

2. the differential type of Electrical Bicycle according to claim 1 is assisted the legpower driving device, it is characterized in that: an end of the relative reaction bevel gear of its central mandrel runs through body, end passes through body openings in addition, cooperate enclosing cover to be covered with sealing at this end opening, and spacer one bearing is located with clasp between day axle one end and the body, and right overhead is being coupling in addition a sheathed clasp and is locating.

3. the differential type of Electrical Bicycle according to claim 1 is assisted the legpower driving device, and it is characterized in that: wherein the cooresponding inner ring surface of drive link is the flank of tooth, and a day axle relative position is a gear hobbing face, makes the drive link engagement be one.

4. the differential type of Electrical Bicycle according to claim 1 is assisted the legpower driving device, and it is characterized in that: wherein the velocity response sheet is a whole ring, equidistantly cuts open at periphery and is provided with separate slot, and staying surplus equidistant axial vane surface is sensitive surface.

5. the differential type of Electrical Bicycle according to claim 1 is assisted the legpower driving device, and it is characterized in that: wherein ratchet is can anchor at the Drive ratchet seat at outer circumferential side matching ring button one spring buckle.

6. the differential type of Electrical Bicycle according to claim 1 is assisted the legpower driving device, it is characterized in that: wherein bevel ratchet wheel is an outside thread at one end, and screws togather with large fluted disc.

7. according to the auxiliary legpower driving device of the differential type of claim 1 or 6 described Electrical Bicycles, it is characterized in that: wherein bevel ratchet wheel one end inboard is being set in day axle after cover one bearing, opening anchor ring at enclosing cover is arranged with bearing, be located at body with cover lock outside and seal inside, form the bearing inner ring face and be set in the outside of bevel ratchet wheel, and between sky axle and bevel ratchet wheel, fill in an oil sealing.