CN2356933Y - Boosting speed variator for bicycle - Google Patents

Abstract

The utility model relates to a boosting and speed change device for bicycles. The utility model is composed of more than two pairs of chain transmission systems with different speed ratios, wherein, each chain transmission system is composed of a large chain wheel, a small chain wheel, a large back flywheel and a small back flywheel. The utility model is characterized in that the outside of the large chain wheel is provided with an inner ratchet ring which is matched and meshed with a core drum of a treadle connection body in one direction through ratchet pawls of the core drum; the outer margin of the core drum is sheathed with a lock ring; the lock ring is shifted by a controller which is arranged on a treadle, and then the lock ring operates the ratchet pawls to open and close. Thus, the engagement and the disengagement of the large chain wheel and the treadle can be realized, and the purposes of boosting and speed change are achieved. As the utility model is respectively arranged on middle shaft and the treadle, the utility model moves synchronously, overcomes the defect of serious abrasion of the relative motion and the insensitive operation existing between the engagement member and the control member of the multiple-chain speed change device, and is a boosting and speed change device with easy manufacture and obvious effect.

Description

The afterburning transmission system of bicycle

The utility model belongs to the afterburning transmission system of trishaw and load bicycle.

The manpower bicycle adopts a chain to move mutually on pagoda shape sprocket wheel to realize speed change at present.Causing shift to occur the chain roller shell often can not accurately move and be enclosed within on the different sprocket of diameter and chain jamming occur and step on drawback such as empty sense.Especially because of its complex structure, bad mechanical strength.Though be widely used in portable bicycle or the racing car, be impractical in manual tricycle, the heavy type bicycle is made afterburning transmission system.Be to solve the afterburning speed change problem of heavy type bicycle and three-wheel vehicle, people provide the transmission system of a lot of double chain drive system in recent years.Though solved the above-mentioned shortcoming of portable shift, yet this type of double chain drive transmission system, the overwhelming majority removes push-and-pull hinge wheel and axis by the shift control mechanism that is fixed on the vehicle frame, and perhaps the engaging and disengaging gear of rear flywheel and back axle (or back beam barrel) is realized speed change.Because the control mechanism of this type of multichain transmission system is positioned on the vehicle frame, they can not rotate synchronously with clutch part and bidirection chain crop rotation.Its final working portion pushes hard always or holds clutch part, long-term clutch part with rotation is in the severe wear or the sharp car situation of relative motion, its service life is very short, the manpower waste is big, to make axial motion during the exhausted most clutch of this type of device in addition, the amount of elongation of axis is too big, and cyclist's two leg spacings are also followed increasing, and it is very inconvenient to ride.The equal De Yanshen of such variable speed control mechanism supplies manual manipulation to the handlebar place, its complex structure, and fault increases thereupon.So tens of kinds of known multichain speed change transmission schemes, almost none enforcement for many years.And the three-wheel vehicle of load-carrying or bicycle very need a kind of mechanical strength height when bear a heavy burden going up a slope, and transmission device that again can rapid afterburning speed change solves the difficult problem of going up a slope.

The purpose of this utility model is to provide a kind of control mechanism and speed-changing mechanism all with hinge wheel, axis rotates synchronously, the long term wear that does not have the parts relative motion, clutch part are not made the afterburning transmission system that the life-span is long, intensity is high, volume is little, fault simple in structure is few of axial motion etc.

The purpose of this utility model is achieved in that between the axis sleeve pipe of common bicycle and pedal crank sets up two sprocket wheels that above diameter is different, each sprocket wheel rear flywheel also different with diameter connects into the different a few cover chain drive systems of transmission speed ratio by chain, it is characterized in that: at the fixing minor sprocket of suit of axis one end of bicycle, minor sprocket is set up a large diameter sprocket by the pedal crank inboard, this hinge wheel mesopore is inlaid with bearing and axis is rotationally connected, the ratchet ring of ratchet in fixedly one of rivet welding has in the outside of hinge wheel, step on turn with the axis socket place fixedly external diameter of rivet welding be slightly less than the core drum of ratchet ring internal diameter, this core drum outer rim locates to be provided with a pair of wide cut ratchet that can radially open and close, (claiming very heavy again) for relative 180 °.Step on and turn and the core drum, and big minor sprocket, all concentric locking collar is contained on the axis, and an end of core drum puts in the ratchet ring, with the ratchet ring bearing fit, the length of core drum and the fabric width of ratchet equate, all exceed the ratchet ring degree of depth one specific dimensions, rouse and step at core and turn adjacent, promptly exceed the specific dimensions place of ratchet ring, suit one lock ring, lock ring and core drum are bearing fit.The lock ring inner edge locates to be provided with two breach for relative 180 °, and this two breach is over against being enclosed within two ratchet outer rims, and the outer rim of lock ring has a shift fork mouth to pedal the place ahead.The shift controller is installed in to step on and turns on the main body, this controller by the lock ring place, be provided with a transverse horizontal minor axis; This minor axis contains in the shift fork mouth that is connected to lock ring, and the central part cover of controller is stuck in to step on and turns on the main body, and wears pin by a center and be rotationally connected, and this controller is tilted upward out to step on for crescent two and turned the upper limb certain angle, and two ends respectively are provided with one and scrunch face.The two ends of controller are that a special angle is rotated in the center of circle up and down with central pin shaft when the rear and front end that the cyclist depresses controller scrunches face, lock ring shift fork side is stirred a specific corner by horizontal stub shafts, this angle makes two breach of lock ring inner edge just in time aim at or cross two ratchets that core rouses, and makes ratchet open and close the purpose that realizes clutch speed-changing.

Because all speed-changing mechanisms of the present utility model and control mechanism are installed in the axis of synchronous rotation and step on and turn, and do not have the powerful push-and-pull contact point of relative motion between the parts, long-term use does not exist any wearing and tearing and brake phenomenon.Clutch part of the present utility model in addition is just the same with the structure and the mechanics principle of rear flywheel, also designed ratchet and interior ratchet, volume all substantially exceeds the ratchet of existing bicycle rear flywheel and several times of ratchet, and its mechanical strength is apparent.The utility model is not that its axis of axial clutch only need extend two centimetres and gets final product in addition, so structure is very compact, this transmission system does not need existing vehicle is changed and new and old bicycle site assembly can be become afterburning derailleur.

Concrete structure of the present utility model is provided by following embodiment and accompanying drawing.

Fig. 1 is a major part cut-away view of the present utility model.

Fig. 2 is the STRUCTURE DECOMPOSITION block diagram of the utility model major part.

Fig. 3 is the utility model and the driving system of three secondary different speed ratios, is installed in the assembling scheme drawing on the three-wheel vehicle.

Fig. 4 sets up the structural representation of rear flywheel when being the utility model repacking bicycle.

Below in conjunction with accompanying drawing concrete structure of the present utility model and service condition are elaborated.

Major part of the present utility model comprises the axis of lengthening and the chain drive system of two different sprocket wheels of above diameter and rear flywheel composition, axis (23) turns (4) by stepping on, one end is set up a large diameter sprocket (16), the mesopore of hinge wheel bearing box (19), with the concentric riveted of bearing (18), hinge wheel is by bearing and axis normal-running fit; The outside of hinge wheel, promptly near stepping on fixedly rivet welding one ratchet ring (17) of the side that turns, this ring inner edge is provided with interior ratchet; Between hinge wheel and the axis shelves (24) a minor diameter sprocket wheel (20) is housed, this minor sprocket by mesopore keyway (21) and axis on default positioning key (22), with minor sprocket and axis permanent fixation.Step on the rear end and the inboard, axis suit hole of turning (4), with the ratchet core drum (12) of aperture axis together, fixing riveted joint; The external diameter of this core drum is slightly less than the ratchet ring internal diameter, its length exceeds about 4 millimeters of the ratchet ring degree of depth, the outer rim of core drum is located to inlay and is provided with two wide cut ratchets (13) that radially open and close for relative 180 °, this ratchet horizontal wide must with the equal in length of core drum, also surpass about 4 millimeters of the ratchet ring degree of depth.Step on turn be sleeved on the axis termination with disjunctor core drum after, one of core drum corrects and inserts in the ratchet ring and ratchet is the cw one way engagement.Between ratchet ring and core drum shelves limits (11), be that the core drum length goes out the about 4 millimeters position of ratchet ring, internal diameter of suit is slightly larger than the lock ring (14) of core drum external diameter, and both are bearing fit, and the inner edge of lock ring is located to have two and can be allowed the open breach of the complete outward radial of ratchet (15) for relative 180 °; This lock ring has a shift fork mouth (9) to the outer rim of stretcher direction, steps on to turn the shift controller (6) that a crescent two is upturned is housed on (4), and this controller card is contained in to step on and turns central authorities, wears lock (5) by one and flexibly connects.Scrunch face (1) before two ends perk place of controller respectively is provided with one, after scrunch face (7), riveted joint has a horizontal cross minor axis (8), the shift fork mouth activity on this horizontal minor axis and the lock ring to contain to connect the face that scrunches behind the controller near a side of lock ring shift fork mouth.When the cyclist needs shift, gently will be before scrunching faces down when stepping on a specific corner horizontal minor axis is then with the rearward end of controller, to wear pin (5) is that the center of circle clockwise rotates a special angle, horizontal minor axis (8) stir shift fork mouth (9) simultaneously and make lock ring to the same special angle of anticlockwise motion, just in time make two breach that are located on the lock ring inner edge relative with two ratchets, two ratchets are subjected to the effect of spring (10) to open interior ratchet one way engagement with ratchet ring.Hinge wheel then clockwise rotates with axis, drives rear flywheel (27) by chain and rotates forward, advances at utmost speed thereby drive bicycle.Otherwise the cyclist with after scrunch face (7) and step on the ad-hoc location lock ring downwards and also stirred by horizontal minor axis thereupon, clockwise rotate a specific corner, this moment, lock ring inner edge breach was just in time crossed two ratchets, and the lock ring inner edge is about to the ratchet compression and closes back, breaks away from fully with ratchet in the ratchet ring.Hinge wheel then loses transmission with outside race idle running with axis and gets in touch, and freely rotates; Be fixed on that minor sprocket (20) on the axis then makes bicycle low speed by chain with large diameter rear flywheel transmission with axis running this moment and reinforcing is advanced.The specific corner of this Setup Controller is by two positioning convex points (2) of its inboard and steps on and turn inboard knock hole (3), coincide by turns and limits.If when needing to install the different driving system of three cover transmission speed ratios on three-wheel vehicle, on the left side is stepped on the inboard of turning the speed-changing mechanism that a cover the utility model provides is installed again as shown in Figure 3.The transmission speed ratio that the diameter of the large size of this mechanism (perhaps medium size) sprocket wheel (25) is formed with rear flywheel (29) diameter of its institute's interlock, should with hinge wheel (16) and minor sprocket (20), the transmission speed ratio that the rear flywheel of corresponding interlock (27) and (28) are formed is distinguished to some extent, forms large, medium and small three kinds of class.Three coaxial being contained on the hind axle (30) of rear flywheel.If this mechanism is installed on the heavy type bicycle, only need between bicycle rear flywheel (28) and back beam barrel (34), add a length and approximate half lining (32) of hole depth in the rear flywheel, make 1/2nd screw threads of first rear flywheel only spin half with the back original threaded line pipe of beam barrel (33), one end of newly-installed one section lengthening threaded line pipe (31) is screwed in half screw that first flywheel stays, newly-increased flywheel (27) is screwed on the threaded line pipe of lengthening, again rear bearing steel bowl is pressed into this threaded line pipe endoporus and gets final product.

Claims (2)

1, a kind of afterburning transmission system of bicycle, it comprises the axis of bicycle, step on and turn, two groups of above chain drive systems that plural big minor sprocket and plural big or small rear flywheel are formed, and major part such as variable speed control mechanism, it is characterized in that: bicycle axis (23) one ends are a minor sprocket of suit (20) fixedly, turn the inboard of (4) by stepping on, have additional a hinge wheel (16), the hinge wheel mesopore studs with bearing (18) and is rotationally connected with axis, there is the ratchet ring (17) of interior ratchet in the outside of hinge wheel fixedly one of rivet welding, step on and turn and fixing core of the rivet welding drum (12) of axis socket place, this core drum outer rim locates to be provided with a pair of wide cut ratchet (13) that can radially open and close for relative 180 °, step on to turn and be contained on the axis with core drum and hinge wheel concentric locking collar, one end of core drum puts in the ratchet ring, with the ratchet ring bearing fit, the length of core drum and the fabric width of ratchet equate, exceed the ratchet ring degree of depth one specific dimensions simultaneously, turn adjacent at core drum with stepping on, position suit one lock ring (14) that promptly exceeds the ratchet ring degree of depth, lock ring and core drum are bearing fit, the lock ring inner edge locates to have two breach (15) for relative 180 °, this breach exceeds the outer rim at ratchet ring position over against being enclosed within two wide cut ratchets, the outer rim of lock ring has a shift fork mouth (9) to the pedal direction, shift controller (6) is installed in to step on and turns on the body by wearing pin (5), controller is the crescent two ends and sticks up and to step on to turn upper limb one specific dimensions, this controller rear side is near the fixing rivet welding one horizontal minor axis (8) in shift fork mouth place, and horizontal minor axis and the activity of shift fork mouth contain and connect.

2, device according to claim 1 is characterized in that: add a lining (32) between bicycle rear axle tube (34) and the rear flywheel (28), two rear flywheels (28) and (27) are by spinning in the newly-increased threaded line pipe (31).

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