CN2389838Y - Automatic speed change gear for bicycle - Google Patents

Abstract

The utility model relates to an automatic speed change rear shaft for a bicycle. The utility model is characterized in that screw threads on both ends of a roller are fixed on a horizontal fork of a bicycle; a constant speed wheel train, a centrifugal device and an axial spring are fixed on the roller; an annular shaft in the centrifugal device is installed on an annular hammer frame; the annular hammer frame is connected with a planet frame in a speed changing wheel train; a planet gear is fixed on the planet frame and is engaged with a center wheel; the outer side of the planet gear is engaged with an inner gear; the center wheel is connected and glued with a rear shaft roller by screws or screw threads. The utility model has the advantages of novel structure, easy manufacture, convenient operation, time saving and labor saving.

Description

The automatic speed-transformation of bicycle axle

The utility model relates to a kind of change bicycle accessories, particularly a kind of automatic speed-transformation of bicycle axle.

At present, the variable speed bicycle of China is of a great variety, but, no matter what grade speed changes all are the moving control of armrest speed changes, be prone to maloperation, meeting of a specified duration damages inner body, even the speed of the actual requirement of speed changing effect out of reach, often works as derailleur common automobile-used, not only having lost the effect of derailleur, also is a kind of waste.Though derailleur wind is for the moment rotten, yet people have more and more lost interest in to derailleur.

Order of the present utility model is carried in order to overcome above-mentioned shortcoming, and a kind of automatic speed-transformation of bicycle axle is provided, but its automatic speed changing, can adapt to descending road conditions, wind-force, load-carrying etc. down automatically and automatic speed changing, promptly save muscle power, save time again, it can become the good vehicle of people.

The purpose of this utility model is achieved in that the automatic speed-transformation of bicycle rear axle, it is characterized in that: the screw thread at beaming roller two ends is fixed on the chain stay of bicycle, one change gear train fixedly is housed on beaming roller, centrifugal device, axial spring, annular shaft in the centrifugal device is contained in the annular hammer carrier, and annular hammer carrier is connected with pinion carrier in the change gear train.On pinion carrier, be fixed with the engagement of planetary wheel and center gear, its external and inner gear engagement, center gear is connected and glueds joint with rear axletree by screw or screw thread, and the axial compression spring is housed in bearing base.

The utility model has the advantages that novel structure is manufactured simply, easy to use, save time, laborsaving, easy to utilize.

Do the embodiment explanation below in conjunction with accompanying drawing:

Fig. 1 is a constructional drawing of the present utility model.

Fig. 2 is the wheel train structure scheme drawing in the utility model.

Fig. 3 structural representation that to be rear axletree be connected and glued joint by screw with center gear.

Fig. 4 is rear axletree and the center gear structural representation that is threaded and glueds joint.

Fig. 3, Fig. 4 are rear axletree and center gear connection diagram.

Fig. 5 is the structural representation after the utility model adds lock.

By Fig. 1-2 as can be known, change gear train is by pinion carrier 26 inner geares 43, satellite gear 45, center gear 44 constitutes, the two ends screw thread of rear axletree 1 is connected with chain stays, middle screw thread with center gear 44 fixing and be glued to that rear axletree upper planet wheel 45 is contained on the pinion carrier 26 and with center gear 44 engagements, inner gear 43 and four satellite gear engagements, the right-hand member of inner gear has right pawl, the left end of pinion carrier has left pawl, cooperate with left and right sides ratchet respectively, reach different speed changes so that drive the back axle body, this axle adopts modulus m=0.6,0.8,1.0 angle of obliquity=20 ° 30 ° of tooth number Z=16-60, material adopts modified material, the cyaniding material, the nitrogenize material, centrifugal device is by hammer carrier 22, hammer plate 21, hammer covers 48 and constitutes, annular shaft 19 is contained on the hammer carrier 22, hammer carrier 22 connects together by driving lever 12 and pinion carrier 26, and this mechanism produces centnifugal force, makes bearing to moving to left and the spring force balance, make spline 30 be in three ad-hoc locations (at low order end, in the straight key of large internal gear, be connected with four little spindle noses at high order end and touch), to reach three speed changes, hammer plate number is 6,8,10,12,14, steering unit is by spring 11, spring cover 15, top 17, left side pin 16, pull bar 42, right pin 40, magnetic cylinder spline 30 constitutes, the size of the angular velocity omega of minor sprocket makes spline be in different axial locations, just reach the position of answering by this operating mechanism, supporting mechanism is by transmission shaft shelves 36, steel ball 37, right ratchet 38, pinion carrier 26, left ratchet 23, left side lid 10, axle bowl 9, steel ball 8, axle shelves 6 constitute, and this shelves length overall is 8MM, left side lid can be whole machine and adds formula, punching type, smart casting formula, but its surface treatment chromium plating is zinc-plated, back axle body adopts 081A materials of aluminum alloy, and the single floral disc bar of solid drawn pipe hole count is 20,18,14, chrome-faced or zinc-plated.

The variable three kinds of speed of the utility model, at a slow speed, speed ratio is 1: 0.75, than middling speed slow 25%, laborsaving when climbing or contrary wind, its moving route is minor sprocket 31-transmission shaft 36-spline 30 (right pawl 28 was pushed back by spline and threw off with right ratchet 38 a this moment) inner gear 43, satellite gear 45 1 center gears 44 1 pinion carriers 26 1 left pawl 24 back axle body 27 middling speeds, speed ratio is 1: 1, and general run of thins uses, and its drive path is that minor sprocket 31-transmission shaft shelves 36-spline 30 is (because ω reaches certain numerical value for a short time, centrifugal mechanism moves to left spline, but still in the straight key of large internal gear, at this moment, enter among the right ratchet during right pawl)-the right ratchet 38-of the right pawl 28-of inner gear 43-after axle body 27.Fast, speed ratio is 1: 1.33, adapt to when being in a hurry and use, its drive path is minor sprocket 31-transmission shaft shelves 36-spline 30 (by angle ω 〉=certain value time, centrifugal mechanism moves to left to little contact spline)-little axle 46-pinion carrier 26-inner gear 43 (because the angular velocity omega of pinion carrier is less than inner gear angular velocity omegas).

The utility model is applied in and can be divided into four types on the bicycle, and promptly the A type is applicable to common lock, pincers like brake, and Type B promptly adds the lock that rises, and the C type promptly adds band-type brake.

Claims (2)

1, a kind of automatic speed-transformation of bicycle rear axle, it is characterized in that: the screw thread at beaming roller two ends is fixed on the chain stay of bicycle, one change gear train fixedly is housed on beaming roller, centrifugal device, axial spring, during annular shaft in the centrifugal device is contained on the annular hammer carrier, the annular hammer carrier is connected with pinion carrier in the change gear train, on pinion carrier, be fixed with the engagement of planetary wheel and center gear, its outer and inner gear engagement, center gear is connected and glueds joint with rear axletree by screw or screw thread, and the axial compression spring is housed in bearing base.

2, according to tooth number Z≤24 of the described center gear of claim 1.

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