CN2780605Y

CN2780605Y - Paddle type gear rack driving bicycle

Info

Publication number: CN2780605Y
Application number: CNU2004201135811U
Authority: CN
Inventors: 林介昌; 姜丽风
Original assignee: Individual
Current assignee: Individual
Priority date: 2004-11-18
Filing date: 2004-11-18
Publication date: 2006-05-17
Anticipated expiration: 2014-11-18

Abstract

The utility model relates to a paddle type rack driving bicycle, which comprises a main shaft arranged in the main body of a driving device, wherein both ends of the main shaft are provided with bearings and the main shaft is provided with a left and a right overrunning clutches and a sprocket. The utility model is characterized in that the left and the right overriding clutches are composed of gears, rollers, cores and accessories thereof which are assembled together, wherein the cores are connected with axle keys; the gears are engaged with teeth of a rack fixedly arranged under the pedal. A reset spring is arranged in the rack of which the outer side is fixedly provided with a rack running limit roller. The rack is provided with convex ribs or grooves on one side without teeth. The roller in a shape matched with the rack is provided with an adjusting frame which is provided with an adjusting screw and an adjusting nut so as to adjust engaged gaps between the rack and the gears. The rack in action is reset via the reset spring arranged in a bore of the rack. The rack driving bicycle provided by the utility model has the advantages of high mechanical efficiency, labor saving, etc.

Description

Pedalling bicycle with rack transmission

Technical field

The utility model relates to a kind of novel Pedalling bicycle with rack transmission, belongs to traditional manpower transportation field.

Background technology

In the prior art, the overall structure of bicycle is varied, but its dynamic characteristic is then identical, i.e. the power of human body output all is by foot-operated crank, hinge wheel, rotates by the minor sprocket (being commonly called as flywheel) on chain drive bicycle rear again.Crank and hinge wheel are fixed together, so bicycle driving mechanism is a crank mechanism.In rotate at hinge wheel 360 °, be by each self-driven 180 ° on two pin of people, crucial problem is that the length of crank fixes, but the arm of force that drives is not constant, and is into varies with sinusoidal function basically.Because, after people take advantage of bicycle to move, the force direction of pin can not be simultaneously to both direction, so every pin is in 180 ° of intervals of strong effect, pin all is to give crank with downward application force by foot-operated son basically, so when having only the downward force direction vertical (90 °) of the length direction that rotates to crank when crank and pin, the arm of force that drives the hinge wheel rotation just reaches maxim, promptly maximum arm of force equals crank length.Leave 90 ° of positions and continue rotation, the arm of force just diminishes gradually, and this Changing Pattern is keeping the sinusoidal function relation.If establish crank length is R, and the arm of force is L, and the corner of crank position, somewhere in 180 ° of intervals is α, then L=Rsin α.180 ° of intervals of the meritorious effect of every pin of conclusion thus, the directed force F that pin is stepped on downwards can be constant, but is not constant by the torque T of crank, hinge wheel output.Because T=FL=FRsin is α.So as long as α ≠ 90 °, under F unmodified situation, the torque of hinge wheel output is the out of reach maxim all.Can conclusion by above analysis: the structure of existing bicycle makes people not reach higher efficient to the power of its input.

In order to change this present situation, the license notification number is that CN2537621Y specification sheets disclosed " reciprocating footoperated bicycle with dual flywheels " has been introduced a kind of wheel both sides and connected left overriding clutch and right overriding clutch respectively, left-hand tread plate is with the right-hand tread plate city and make structure also be connected left opinion and the right side driving opinion of driving respectively, messenger chain be in transmission connection successively the wheel of falling, right overriding clutch, right drive wheel on left driving wheel, left overriding clutch, the vehicle frame, left driving wheel and right drive wheel all are accentric sectional wheels, and its eccentric throw increases along the engagement direction gradually from the driving chain point of connection.Also having notification number for " pedal type does not have the chain bicycle with stepless speed change " and the notification number that the CN2043961U specification sheets provides is " autocycle " of CN1088437C report, also is the improvement that existing bicycle is made.The disclosed bicycle of above-mentioned specification sheets respectively has characteristics, but has complex structure equally, problems such as driving efficiency is low, cost height.

Summary of the invention

The utility model has solved the problem that said structure exists, and the novel Pedalling bicycle with rack transmission that provides the driving efficiency higher is provided its purpose.

The utility model is to be achieved through the following technical solutions above-mentioned purpose.

A kind of Pedalling bicycle with rack transmission, comprise the main shaft of installing in the actuating device main body, the main shaft two ends are provided with bearing, overriding clutch and sprocket wheel are installed on the main shaft, this overriding clutch is assembled by gear, roller, fuse and annex thereof, fuse connects with main shaft key, and the tooth of the tooth bar below it is characterized in that said gear and being fixedly mounted on pedal is meshed, and retracing spring is housed in the tooth bar.When the human pin was stepped on a side pedal downwards, the tooth bar that becomes one with pedal moved down thereupon, drove engaging gear and rotated, and drove bicycle walking; When people's pin upwards lifted, tooth bar was under the effect of retracing spring, and rise resets automatically.Left and right pin so moves in circles, and the left and right pedal of bicycle replaces lifting, just can drive bicycle walking always.

For guaranteeing being meshing with each other of wheel and rack, not depart from during the tooth bar up-and-down movement, tooth bar operation restriction roller or block plate fixedly are equipped with in the side of above-mentioned tooth bar.Tooth bar does not have the side of tooth both can be provided with convex tendon at them also can be provided with groove, as long as the shape of roller is mated with tooth bar.Roller is as the track of tooth bar motion, and in the time of can guaranteeing that tooth bar moves up and down with pedal, tooth bar is meshed with gear all the time, transmits to drive power.

In order to adjust the back lash between the rack and pinion, adjustment rack is housed on the above-mentioned rollers, trimming screw and adjustment nut are housed, so that the back lash of stepless adjustment rack and pinion on this adjustment rack.Tooth bar is in operation resets is that retracing spring by being contained in the tooth bar endoporus is finished.This retracing spring lower end seat rides on the return spring holder, and fixing screw (not showing figure number) and floating guiding cover also are housed in the endoporus of tooth bar.The upper end of tooth bar connects pedal base by lead screw, in this pedal base pedal is housed.

In said mechanism, overriding clutch has unidirectional transmission performance.Therefore, the sprocket wheel that connects (or key connecting) with main spindle multiple spline also can only unidirectional rotation.When rider's pin steps down on the pedal, when tooth bar was moved downward, gear is inevitable to rotate forward, thereby the sprocket wheel that drives on the main shaft by overriding clutch rotates forward.This sprocket wheel is by chain drive and the affixed sprocket rotation of bicycle rear, and bicycle just travels forward.The direction that acts on the power (F) on the tooth bar owing to pedal is consistent with the sense of motion of tooth bar, and all the radius of gyration R with the point of engagement of the tooth of gear is vertical any time of the sense of motion of tooth bar under power (F) effect, so, overall process in power (F) effect, the rotation arm of force of its gear is constantly equal to its radius R, if the value of F is constant, then the rotating torque M of the gear under F drives must be for constant: M=FR.In the overall process of 180 ° of gear rotations, U=M that its torque M is done work π=FR π; And standard bicycle, when hinge wheel turn over 180 ° step on F on crank merit UX ₀=∫ ₀ ¹⁸⁰FR sin α d α=-FR (cos α) | ₀ ¹⁸⁰=2RF

U/U ₀＝πFR/2FR＝1.57。Only, can find out under the effect of same F power with regard to the result of computing formula, pinion and rack and crank mechanism institute work, the former is 1.57 times of the latter.Certainly, 1.57 times of pinion and rack and crank mechanism institute work out of reachs in fact.Because the meshing efficiency of wheel and rack is 98%, and the weight of pinion and rack also increases to some extent than the weight of former crank mechanism.It is very little causing in the retracing spring waste of power at work that tooth bar is resetted, because retracing spring is an energy-accumulating element.When people step on retracing spring with pin, when retracing spring was compressed, retracing spring had stored energy, and retracing spring vows that the energy of emitting helps a tooth bar and pin to lift again.Retracing spring be compressed with the one-period that stretches in, the energy that loses only is that the distortion that twists of retracing spring cross section produces and is dispersed into airborne heat, this energy is very little, can ignore.

Actuating device provided by the utility model adopts the wheel and rack engaging mechanism, with wherein whole factors of influential driving efficiency (as each efficient to gear mesh is 98%, each efficient to bearing also is 98% or the like) all take into account, machinery driving efficiency of the present utility model is higher more than 25% than the machinery driving efficiency of standard bicycle.So it is higher that the utility model will provide a kind of mechanical efficiency to people, more the labour-saving Pedalling bicycle with rack transmission.

Description of drawings

Fig. 1 is the utility model example structure scheme drawing.

Fig. 2 is that Figure 1B-B is to the section structure cutaway view.

Number in the figure explanation: 1. fuse, 2. adjusting pad, 3. main shaft, 4. circlip, 5. bearing, 6. roller, 7. gear, 8. end cap, 9. tooth bar, 10. bolt shaft, 11. rollers, 12. guard shields, 13. adjustment racks, 14.15. nut, 16. screws, 17. main bodys, 18. sprocket wheels, 19. retracing springs, 20. return spring holders, 21. floating guiding covers, 22. lead screw, 23. pedals, 24. pedal bases.

Introduce the utility model specific embodiment in detail below in conjunction with accompanying drawing.

The specific embodiment

A kind of Pedalling bicycle with rack transmission, comprise the main shaft of installing in the actuating device main body 17 3, bearing 5 has been set up at main shaft 3 two ends, overriding clutch and sprocket wheel 18 are installed on the main shaft 3, this overriding clutch is assembled by gear 7, roller 6, fuse 1 and annex thereof, fuse 1 and main shaft 3 key connecting, the tooth of the tooth bar 9 of gear 7 below being fixedly mounted on pedal 23 is meshed, and retracing spring 19 is housed in the tooth bar 9.

Present embodiment is seen illustrated in figures 1 and 2.Form overriding clutch by fuse 1, roller 6, ejector pin (see Fig. 2, do not show figure number), microsprings (see Fig. 2, do not show figure number) and gear 7.Fuse 1 is splined (or key connecting) with main shaft 3.This overriding clutch has a characteristic of unidirectional delivery power, the tooth of tooth bar 9 and gear 7 engagements, when the pin on stepping down in pedal 23 is stepped on downwards, tooth bar 9 moves downward (Figure 2 shows that tooth bar 9 goes downwards to end position), then gear 7 moves thereupon, fuse 1 is a splined with main shaft 3, so, when tooth bar 9 moved downward, main shaft 3 just rotated forward, and sprocket wheel 18 is splined (or key connecting) with main shaft 3, therefore, the motion of tooth bar 9 has driven sprocket wheel 18 and has rotated, and in tooth bar 9 endoporus retracing spring 19 is housed, and these retracing spring 19 lower end seats ride on the return spring holder 20.Sprocket wheel 18 is by the sprocket wheel of chain (not showing figure number) driving bicycle rear, and bicycle just travels forward.After tooth bar 9 was stepped on, pin lifted, and then tooth bar 9 resets under the effect of retracing spring 19.In the process of tooth bar 9 upward movements, gear 7 will reverse thereupon, and by the decision of overriding clutch characteristic, this moment, the rotation of gear 7 can not influence the original state of kinematic motion of fuse.So though two tooth bars 9 move reciprocatingly at work, and sprocket wheel 18 just rotates forward; The also just continuous ahead running of bicycle.Because retracing spring 19 is long, so, fixing screw and floating guiding cover 21 is housed in the endoporus of tooth bar 9.The side there not being tooth of tooth bar 9 is provided with convex tendon or groove, the shape of roller 11 and tooth bar 9 couplings, and the groove of roller 11 is used for limiting the path of motion of tooth bar 9, plays the track

effect.By adjustment nut

14,15 and trimming screw 16, make adjustment rack 13 relative guard shields 12 produce displacement, adjust the gap between roller 11 and the tooth bar 9.The upper end of above-mentioned tooth bar 9 connects pedal base 24 by lead screw 22, in this pedal base 24 pedal 23 is housed.

Main body 17 also can be made several segments combined structures, to form relatively large space is only arranged around sprocket wheel 18.Being connected with multiple mode and can selecting of main body 17 and bicycle shelf.One class is removable connection, and in this class connected, a kind of was respectively to increase with weldment in main body 17 and bicycle shelf respectively, with bolt main body 17 is connected with bicycle rack again.Another kind is by arc clip connector independently (circle coupling outside its circular arc portion and the main body 17), with bolt main body 17 is fastened on voluntarily on the shelf, and this structure can be adjusted the inclination angle of tooth bars 9 according to motroist's different healths.Another kind of main body 17 is exactly with main body 17 direct and bicycle shelf welding with the connecting mode of bicycle rack, and main body 17 and bicycle rack are become one.

The also available handle ratchet wheel of above-mentioned overriding clutch mechanism (as minor sprocket internal mechanism on the wheel behind the standard bicycle).

Claims

1, a kind of Pedalling bicycle with rack transmission, comprise the main shaft of installing in the actuating device main body [17] [3], main shaft [3] two ends are provided with bearing [5], overriding clutch and sprocket wheel [18] are installed on the main shaft [3], this overriding clutch is assembled by gear [7], roller [6], fuse [1] and annex thereof, fuse [1] and main shaft [3] key connecting, the tooth of the tooth bar [9] below it is characterized in that said gear [7] and being fixedly mounted on pedal [23] is meshed, and retracing spring [19] is housed in the tooth bar [9].

2, rack driven bicycle according to claim 1 is characterized in that tooth bar operation restriction roller [11] fixedly is equipped with in the side of said tooth bar [9].

3, rack driven bicycle according to claim 2 is characterized in that said tooth bar [9] is provided with convex tendon or groove in the side that does not have tooth, the shape of roller [11] and tooth bar [9] coupling.

4, according to claim 2 or 3 described rack driven bicycles, it is characterized in that adjustment rack [13] is housed on the said roller [11], trimming screw [16] and adjustment nut [14,15] are housed on this adjustment rack [13].

5, according to claim 1,2 or 3 described rack driven bicycles, it is characterized in that the retracing spring [19] in said tooth bar [9] endoporus, this retracing spring [19] lower end seat rides on the return spring holder [20].

6, rack driven bicycle according to claim 5 is characterized in that in the endoporus of said tooth bar [9] fixing screw and floating guiding cover [21] being housed.

7, rack driven bicycle according to claim 1 is characterized in that the upper end of said tooth bar [9] connects pedal base [24] by lead screw [22], and pedal [23] is housed in this pedal base [24].