CN2062709U - Double-speed sprocket-wheel for vehical pulled by man - Google Patents

Abstract

The utility model provides a device of a double-speed sprocket wheel for bicycles. The utility model is characterized in that a reduction gear composed of a driving inner gear ring, a plurality of planetary gears, cards, push rods, concave tooth pits, convex tooth pits, circumscribing loop flaps, ratchet pawls, springs, etc. is additionally arranged on a crank and the side of a big sprocket wheel ring. The reduction gear and the big sprocket wheel form the double-speed sprocket wheel with two kinds of speed and adjustable use. The utility model has the advantage of simple and compact structure and can be arranged in a housing of the big sprocket wheel for protecting transmission elements. The high-low speed can be adjusted conveniently, and the utility model is suitable for bicycles, manpower tricycles and convertible cars of manpower and motor vehicles.

Description

Double-speed sprocket-wheel for vehical pulled by man

The utility model belongs to a kind of rickshaw transmission system, particularly is applicable to the sprocket wheel two-stage speed change gear of bicycle, three-wheel vehicle.

In the prior art, the transmission system of bicycle roughly has two kinds: the one, adopt cone pulley structure, make chain be on the different wheel sheets before changing the speed ratio of trailing wheel to realize with dialling the chain device, this installs more complicated, the cost height, and when work front and back wheel often not at grade, the chain discontinuity fractures easily; Another kind is that sun and planet gear makes variable shaft and is installed in step by-step variable gear on the rear axle of bicycle, this transmission system structure more complicated, and also fitting limit is narrower, makes driving force thin, damages malfunctioning easily.So the bicycle that uses is seldom installed this two kinds of transmission systems at present.

The purpose of this utility model is at the existing existing problem of transmission system of bicycle, designs a kind of simple in structurely, and speed governing is dual-speed sprocket easily.

Task of the present utility model is achieved in that on crank and a dual-speed sprocket of being made up of to card, speed change push rod, outconnected aunular sheet and spring active inner gear, several planetary wheels, driven sun gear, ratchet, card post, two bullet is set up in the side of sprocket wheel.The initiative inner cogwheel collar of this sprocket wheel is fixed on the crank with supporting blade, have the opposite recessed tooth of serration that plays sour jujube effect of both direction on the edge of inner gear ring, the back to one as pushing two bullets when changeing quick at a slow speed open to card usefulness, one of forward directed two bullets when quick are used to the stuck initiative inner cogwheel collar of card.The side of big chain wheel compressing tablet clamp large internal gear, planetary wheel and sun gear, planetary wheel is contained on the outstanding fulcrum of hinge wheel side equably, can rotate, and be meshed with the tooth of active inner gear and sun gear, thereby offing normal to distance of shaft centers of big chain wheel also by Guan Ding simultaneously.Sun gear is contained on the outrigger shaft of crank, can rotate, and interior with clip circle pipe clamp, can not deviate from its position outward, nearly vehicle body frame one side of sun gear is equipped with four outstanding card posts, the card post can match with the outconnected aunular sheet that tightly is enclosed within on the bottom bracket cup that has ratchet, and composition resembles the similar sun gear that makes of bicycle flywheel can only be clockwise, can not retreat the unidirectional flywheel character of reverse.Two bullets are contained on the hinge wheel sheet to card, be contained in two bullets on card by one one, the other end is contained in the pulling force catapult tension on the hinge wheel sheet, make two bullets the elastic force of bullet to the inner gear ring edge all can be arranged to card two, resemble the whip system principle of electric switch, I am referred to as two bullets to card, two bullets wherein are equipped with the push rod that commentaries on classics is used fast on one to card, the other end has the sawtooth tooth of protrusion and chews, can with the forward direction sawtooth tooth interlock mutually of being opened on the inner gear ring edge, and commentaries on classics also is housed pushes away with it at a slow speed and collude, this colludes admittedly and extremely has to card on the tail end of one of sawtooth tooth at two bullets, and its position of colluding should be suitable with the push rod that the commentaries on classics that is contained on the inner gear ring is used at a slow speed.

In the accompanying drawings, Fig. 1 is the scheme drawing of the utility model dual-speed sprocket, and Fig. 2 is the cut-away view along the A-A line of Fig. 1, and Fig. 3 forms the outconnected aunular sheet of unidirectional flywheel character and the scheme drawing of ratchet thereof between the sun gear of dual-speed sprocket and the vehicle body frame.

In the accompanying drawing: 1 is crank, 2 supporting blades, 3 initiative inner cogwheel collars, 4 planetary wheels, 5 compensating-gear shafts, 6 sun gears, 7 sun gears are by the side-prominent card post of vehicle body frame one, and 8 are contained in the hinge wheel on the hinge wheel sheet and the spacing intermediate plate in plane of inner gear ring, 9 big chain wheels, 10 torsion catapults, 11 change the push rod of using fast, and 12 pairs of bullets are to card, 13 pairs of bullets are to the card fix shaft, 14 change the push rod of using at a slow speed, 15 pulling force catapults, and 16 commentaries on classics push away with it at a slow speed colludes, bottom bracket cup on 17 vehicle body frames, 18 outconnected aunular sheets that have ratchet that are locked on bottom bracket cup, 19 ratchet, 20 catapult sons.

Below in conjunction with accompanying drawing in detail principle of work of the present utility model is described in detail:

(1) when two bullets when the sawtooth tooth of card 12 is killed mutually with the sawtooth tooth on the inner gear ring edge, the power of stepping on forward on the foot-operated crank 1 passes on the initiative inner cogwheel collar 3 by supporting blade 2, pass on the big chain wheel 9 to card 12 by two bullets again, big chain wheel 9 drives chain advances wheel, be for fast, that is be the speed of original single speed sprocket wheel.

(2) when the foot-operated crank 1 that drives, step on when stepping on slightly backward, being installed in push rod 14 that the commentaries on classics on the initiative inner cogwheel collar 3 uses at a slow speed just can withstand commentaries on classics and push away with it at a slow speed and collude 16, and a two bullet has an end of sawtooth tooth to push away the edge of inner gear ring 3 to card 12, make the sawtooth tooth of originally killing separate (this moment, two bullets were identical with accompanying drawing 1 drawn state to the position of card), also make simultaneously the edge of two bullets to the tight inner gear ring 3 of the other end of card bullet, reached by quick commentaries on classics state at a slow speed, ride to transfer to stepping on forward then and step on, crank 1 this moment power forward passes to initiative inner cogwheel collar 3 by supporting blade 2, pass to again on planet tooth 4 and the sun gear 6, drive whole planet tooth system, according to the planetary system principle, this moment, inner gear ring was clockwise forward, sun gear will produce the power that reverses backward, but because sun gear 6 is formed unidirectional flywheel state by card post 7 and clasp piece 18, so sun gear 6 can not reverse backward, forcing planetary wheel 4 rotations and promoting big chain wheel 9 follows active inner gear 3 to rotate forward with identical direction with slow slightly speed (comparatively speaking), its speed is than active inner gear 3 slow slightly (promptly slowing down), reason is that inner gear 3 is when turning around around sun gear 6, planetary wheel 4 also because of from then make its planetary wheel 5 produce relative displacement backward with position between inner gear ring, form relative slowing down with inner gear ring 3 rotative speeds, its ratio that slows down is different because of the number of teeth of the number of teeth of sun gear 6 and inner gear ring 3, if under the number of teeth unmodified situation of sun gear, the number of teeth of inner gear is many more, it is more little promptly to slow down, otherwise promptly big more.Because planet tooth axle 5 is dead admittedly on hinge wheel 9, advances so big chain wheel 9 also drives wheel decelerates with the speed that slows down relatively with initiative inner cogwheel collar 3 by chain, be at a slow speed.

(3) desire to think to transfer to again when quick this moment, step on slightly as long as will ride backward, back on initiative inner cogwheel collar 3 edges forwarded to when changeing the quick push rod of using 11 places to sawtooth tooth position, just can promote two bullets to card 12, make two bullets have an end of sawtooth tooth to nestle up on the edge of inner gear ring 3 to card 12, finish by changeing controlling of fast state at a slow speed, just can step on forward and step on, initiatively the forward direction sawtooth tooth on internal-gear circle 3 edges forward two bullets to just can engaged dieback when the sawtooth tooth position of card 12, promoting hinge wheel and wheel advances fast, so analogize, when being originally quick, foot-operated stepping on slightly just backward can transfer at a slow speed, and when being originally at a slow speed, foot-operated stepping on slightly backward just can transfer to fast.This speed change has confirmed it is very convenient and flexibility and reliability from practice.

In order to make the utility model compact conformation, be convenient to be installed in the big chain cover, initiatively inner gear, the gear piece thickness of planetary wheel and sun gear preferably is no more than 8 millimeters, module of gear is suitable with 1 to 4, the number of planet tooth with 3 to 8 for well, compensating-gear shaft also can be adorned ball bearing of main shaft.

The utility model is simple and compact for structure, can be contained in protection driving parts in the big chain cover, and speed two speed are arranged, and speed governing is convenient and reliable, is specially adapted to general bicycle and uses, and can be applied to pedicab, the motor-driven convertible car of manpower.

Claims (4)

1, a kind of rickshaw dual-speed sprocket, it includes hinge wheel and crank interior, it is characterized in that:

A. on crank 1, set up one by initiative inner cogwheel collar 3, several planetary wheels 4, the planetary reduction systems that sun gear 6 is formed with the side of big chain wheel 9.Initiative inner cogwheel collar 3 is fixed on supporting blade 2 and the crank 1.The side of big chain wheel 9 usefulness banking stop 8 clamp large internal gear circles, 3 planetary wheels 4 and sun gear 6, and by fixed its shaft core position of compensating-gear shaft 5 holders, several planetary wheels 4 are contained on the compensating-gear shaft 5 of big chain wheel 9 sides equably.Initiatively the tooth of inner gear 3 planetary wheels 4 and sun gear 6 is intermeshing.

B. on the edge of initiative inner cogwheel collar 3, have forward and play the recessed notched teeth position of sour jujube effect to latter two, and push rod 14 that commentaries on classics uses at a slow speed and the inside tight spring 10 of bullet be installed, two bullets are housed to card 12 at big chain wheel 9 corresponding to the edge of inner gear ring 3, two bullets are to a protruding sawtooth tooth that the notched teeth forward that can withstand on internally toothed annulus 3 edges is arranged of card, and be equipped with and can be changeed at a slow speed push rod 14 and promote two bullets and collude 16 with pushing away at a slow speed to the commentaries on classics of card 12 usefulness, to the other end of card 12 push rod 11 and the tension spring 15 that commentaries on classics is used fast is housed at two single bullets.Nearly vehicle body frame one side at sun gear 6 also extremely has card post 7 admittedly, reach outconnected aunular sheet 18 and the ratchet 19 that tightly is enclosed within on the bottom bracket cup by card post 7, spring bow young 20 is common to be formed one and can make sun gear 6 become unidirectional flywheel, can only be clockwise forward and the mechanism that can not reverse backward.

2, the dual-speed sprocket of being narrated according to claims 1, its feature are that also the transverse tooth thickness degree of initiative inner cogwheel collar 3 planetary wheels 4 and sun gear 6 is not more than 8 millimeters.

3, the quantity that the dual-speed sprocket of being narrated according to claims 1, its feature also are planetary wheel 4 with 3 to 8 for well.

4, the dual-speed sprocket of being narrated according to claims 1, its feature also are also can load onto antifriction-bearing box between planetary wheel 4 and the compensating-gear shaft 5.

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