CN2106129U - Double speed chain wheel for bicycle - Google Patents

Abstract

The utility model provides the double speed chain wheel of a bicycle. The utility model is characterized in that the sides of a crank and a big chain wheel ring are additionally provided with a reduction gear composed of a driving inner gear ring, a plurality of central gears of planetary gears, cards, push rods, concave pits, outside connecting pieces of advanced clutch, tabletting rings and springs. An adjustable double speed chain wheel is formed by the combination of the reduction gear and the big chain wheel. The utility model has the advantages of simple and compact structure, which can be used for protecting driving components when the utility model is arranged in a big chain cover. Thus, the high and the low speeds can be adjusted conveniently. The utility model can be applied in the bicycle, the manpower tricycle and the convertible vehicle with man power and motor power.

Description

Double speed chain wheel for bicycle

The utility model belongs to a kind of derailleur, 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: a kind of is to adopt the cone pulley toothing, make chain be on the different wheel gear pieces that the speed ratio of the back gear teeth before changing realizes with dialling the chain device, this installs more complicated, the cost height, and before and after when work the gear teeth often not at grade, the chain discontinuity fractures easily, takes off chain during throw-over 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 complex structure, and also fitting limit is narrow, makes driving force thin, damages malfunctioning easily.So the bicycle that uses is seldom installed this two kinds of transmission systems at present.To be 89221921.1 rickshaw dual-speed sprocket obtain patent by my design and application to the patent No. that patents recently, and existing I am improved to more perfect dual-speed sprocket of bicycle to it in trial product.

One's own profession is at the existing existing problem of transmission system of bicycle with later-model purpose, designs a kind of simple in structurely, and speed governing is convenient, and is easy to manufacture, the low-cost dual-speed sprocket of bicycle of saving in material.

Task of the present utility model is achieved in that the side of and sprocket wheel other at crank, set up one by active inner gear, several planetary wheels, the dual-speed sprocket that sun gear, two bullet are formed to card, card push rod, advanced on-of outer linking piece, clamp, clamp seat, bolster, inner gear supporting blade, compressing tablet circle, ball sheet and spring etc.The active inner gear of this sprocket wheel supports and is fixed on the crank with the inner gear supporting blade, the edge of inner gear ring has several recess that plays sour jujube effect, each all has two kinds of identical effects this recess: the one, as tightening mutually with the Ka Zui of two bullets to card, form the fast state of dual-speed sprocket, the 2nd, when crank rotates backward, this recess can two bullets to the Ka Zui of card push away inner gear and bullet to sprocket wheel near the sprocket part, form the state at a slow speed of dual-speed sprocket.The interior garden of inner gear supporting blade is fixed on the crank, the outer rim place has the recess of the recess same number of opening with inner gear, the effect of its recess is to match with the card push rod two bullets are formed fast state to the recess that the Ka Zui of card pushes the inner gear edge, the recess of the recess of inner gear supporting blade and inner gear will maintain a certain distance the position for this reason, make it to match to the Ka Zui of card and the position of card push rod, just can play the throw-over effect with two bullets.Sprocket wheel is with compressing tablet circle clamp large internal gear, the side of planetary wheel and sun gear, several planetary wheels are contained on the fulcrum of hinge wheel side equably, and the ball sheet is housed, can rotate, and be meshed with the tooth of active inner gear and sun gear, thereby the distance of shaft centers of hinge wheel is offed normal, and also the while by Guan Ding, sun gear is contained in the side at the nearly axis of crank place, be enclosed within on the axis rotationally, sun gear is being equipped with a clamp seat regularly near vehicle body one side, can with advanced on-of outer linking piece and clamp, the common picture bicycle freewheel similar quality that sun gear can only be rotated forward and can not rotate backward of forming of spring.Advanced on-of outer linking piece is can make centre tooth play leading clutch action can tighten bottom bracket cup again and make the garden sheet that self is fixed on the bottom bracket cup, its endoporus is installed on the clamp seat and clamp of sun gear side, having several can have with the mutually stuck interior ratchet of clamp and centre tooth is changeed promptly forward skid, and turn round is the effect of stuck leading power-transfer clutch, one side of its close bottom bracket cup has screens can tighten bottom bracket cup, makes advanced on-of outer linking piece keep not rotating.Two bullets are fixed on the sprocket wheel with sieve silk to card, can left-right rotation, control it with a torque spring, make its portion of chewing can be tight to the recess bullet of inner gear, again can be tight to another opposite direction bullet, so be called two bullets to card, two bullets can be installed the card of torque spring and chew tail under there is protruding high slightly any make at the Ka Zui place of card, the card push rod is installed in the afterbody of two bullets to card with sieve silk, can left-right rotation, with the tension of tension spring, and to make its dead position of chewing be in when two bullet its portions of chewing when card is in fast state can leave the inner gear supporting blade the edge and when the position at pair bullets edge that its portion of chewing can the tight large internal gear supporting blade of bullet when card is in state at a slow speed just passable.The compressing tablet circle is used for the inner gear clamp is freely rotated usefulness on the plane of sprocket wheel, and it is fixed on the sprocket wheel with several screws, higher slightly to the position of card near two bullets, in order to avoid kill card and the card push rod can not rotate to wanting.Spring has respectively one of tension spring pressure spring and torque spring, one of tension spring is installed in two bullets are installed in the nearly screw of card push rod position near position from the other end, position about the middle part to card, pressure spring is contained between the portion of chewing and clamp seat of clamp, one of torque spring is installed in the card that two bullets chew to card and chews afterbody, the other end is installed on the sprocket wheel, the position of installing is very important, must guarantee two bullets in the portion of chewing of card both can the recess of the tight inner gear of bullet, can be pushed open by recess again and bullet is just passable to other direction.Perforate is wanted in the centre of sprocket wheel, and this Kong Yaoneng puts into advanced on-of outer linking piece, and is keeping off advanced on-of outer linking piece with 4 small pieces and do not taking off outward.

In the accompanying drawings, Fig. 1 is the scheme drawing of the utility model dual-speed sprocket of bicycle, Fig. 2 is the A-A line cut-away view along Fig. 1, Fig. 3 is for removing the scheme drawing remove behind 11 among Fig. 1,12,10, Fig. 4 is the A-A line cut-away view along Fig. 3, and Fig. 5 is for removing the scheme drawing remove behind 8 among Fig. 3,5,4,3,19,15, and Fig. 6 is the A-A line cut-away view along Fig. 5, Fig. 7 is an advanced on-of outer linking piece, and Fig. 8 is the recess position views of two bullets to card and inner gear and inner gear supporting blade.

In the accompanying drawings: 1 is sprocket wheel, and 2 is screw, and 3 is inner gear, and 4 is planetary wheel, 5 is the ball sheet, and 6 is fulcrum, and 7 is advanced on-of outer linking piece, and 8 is sun gear, 9 is clamp, and 10 is the compressing tablet circle, and 11 is crank, 12 is the inner gear supporting blade, and 13 for tightening up nail, and 14 for being fixed on four blocks on next door, garden in the sprocket wheel, 15 be two bullets to card, 16 is the card push rod, 17 is tension spring, 18 is torque spring, and 19 is pressure spring, and 20 is the clamp seat.

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 one of them recess on the inner gear edge withstands in the card portion of chewing of card 15, the power of pedaling forward on the foot-operated crank 11 passes on the active inner gear 3 by inner gear supporting blade 12, pass to sprocket wheel 1 by two bullets to card 15 again, driving chain and wheel advances, be for fast, that is be the speed of original single speed sprocket wheel.(this moment, two bullets were identical with accompanying drawing 3 drawn states to the position of card).

(2), when foot-operated drive crank 11 is pedaled backward slightly, the edge of inner gear 3 just can eject two bullets to come to the Ka Zui of card 15 from recess, simultaneously also to make elastic force tightly change outside bullet into by inside bullet tight because of changing the position for torque spring 18, take advantage of a situation just two bullets to the edge of the Ka Zui of card 15 bullet from inner gear 3, also make simultaneously two bullets to inner gear 3 on one side to the afterbody bullet of card 15, thereby also make the chewing on the edge that point is pressed on inner gear supporting blade 12 of card push rod 16, scrunch this moment forward, crank 11 power forward passes on the inner gear 3 by inner gear supporting blade 12, pass to again on planetary wheel 4 and the sun gear 8, drive whole planetary system, according to the planetary system principle, this moment, inner gear 3 was clockwise forward, and sun gear 8 will produce the power that reverses backward, but because sun gear 8 is by clamp seat 20.Clamp 9 matches with ratchet in the advanced on-of outer linking piece 7 and is designed and manufactured into forward and can skids, backward can be stuck mutually, sun gear 8 can not be turned round, so just force this moment planetary wheel 4 forward rotation and by fulcrum 6 promote sprocket wheels 1 and then active inner gear 3 rotate forward with identical direction with slow slightly speed (comparatively speaking), be at a slow speed.The principle of slowing down is when turning around around sun gear 8 because of inner gear 3, planetary wheel 4 also because of from then make the fulcrum 6 of planetary wheel 4 produce relative displacement backward with the position of 3 of inner geares, form relative slowing down with inner gear 3 rotative speeds, its ratio that slows down is different because of the number of teeth of the number of teeth of sun gear 8 and inner gear 3, if under the number of teeth unmodified situation of sun gear 8, the number of teeth of inner gear 3 is many more, and it is more little promptly to slow down, otherwise promptly big more.

(3), desire to think to transfer to again this moment fast, pedal slightly as long as will ride backward, when the recess on inner gear supporting blade 12 edges forwards when place point of chewing of card push rod 16 to, chew point and just can draw in recess by the pulling force of tension spring 17, continue to turn round just card push rod 16 about an angle of 90 degrees that rotates backward, recess also from card push rod 16 chew point, and tension spring remained the point of chewing of card push rod 16 was strained on the edge of large internal gear supporting blade 12 this moment, scrunch forward this moment again, the chewing point and can enter in the recess again of card push rod 16, drag again and stop card push rod 16 and turn 90 degrees the angle forward, in the process of this rotation, can analyze the card push rod in Fig. 8 and just can advance the Ka Zui of two bullets in the recess, and card push rod 16 also leaves the edge of inner gear supporting blade 12, forms fast state to card 15.Two bullets are chewed the recess of dieback inner gear 3 to card, promoting sprocket wheel advances fast, so analogize, two bullets are quick to the recess that the Ka Zui of card 15 withstands inner gear 3, otherwise leave is at a slow speed, the throw-over method that is to say this dual-speed sprocket of bicycle be by fast commentaries on classics at a slow speed the time as long as scrunch a little backward, pedaling forward is at a slow speed again, pedals about 3/4ths after also being fast to pedal forward about enclosing be fast again by changeing at a slow speed.So its speed governing should be calculated easily and failure-free.

In order to make the utility model compact conformation, the gear piece thickness of planetary wheel 4 and sun gear 8 preferably is no more than 8 millimeters, and module of gear is suitable with 1 to 4, the number of planetary wheel 4 with 3 to 8 for well, planetary wheel fulcrum 6 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; speed two speed are arranged; speed governing is convenient and reliable; being specially adapted to general bicycle uses; and can be applied to manual tricycle, the motor-driven motor moped of manpower also can be combined into the novel how fast car of easier speed governing with the how fast car of existing cone pulley.

Claims (4)

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

A, sides other at crank 11 and sprocket wheel 1 are set up one by active inner gear 3, several planetary wheels 4, the planet tooth deceleration system that sun gear 8 is formed, initiatively inner gear 3 is fixed on inner gear supporting blade 12 and the crank 11, the side of sprocket wheel 1 usefulness compressing tablet circle 10 clamp large internal gears, 3 planetary wheels 4 and sun gear 8, and by fixed its shaft core position of planetary wheel fulcrum 6 holders, several planetary wheels 4 are installed on the planetary wheel fulcrum 6 of hinge wheel 1 side equably, and initiatively the tooth of inner gear 3 planetary wheels 4 and sun gear 8 is intermeshing;

B, on the edge of active inner gear 3, have several recess, simultaneously, also have the identical recess of being opened with inner gear 3 of recess number on the edge of large internal gear supporting blade 12.In nearly vehicle body one side that is heart gear 8 clamp seat, clamp, pressure spring are installed also, can form the mechanism of the leading clutch action that sun gear 8 can only be rotated forward and can not rotate backward jointly with advanced on-of outer linking piece.

2, the dual-speed sprocket of bicycle of narrating according to claim 1, its feature are that also the gear piece thickness of active inner gear 3 planetary wheels 4 and sun gear 8 is not more than 8 millimeters.

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

4, the dual-speed sprocket of narrating according to claim 1, its feature also are also can load onto antifriction-bearing box between planetary wheel 4 and the compensating-gear shaft 6.

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