CN2169596Y

CN2169596Y - Bicycle gear driving device

Info

Publication number: CN2169596Y
Application number: CN 92235517
Authority: CN
Inventors: 李明
Original assignee: Individual
Current assignee: Individual
Priority date: 1992-09-14
Filing date: 1992-09-14
Publication date: 1994-06-22
Anticipated expiration: 2002-09-14

Abstract

Disclosed is a bicycle gear driving device, which is a power driving mechanism for bicycles. The utility model is composed of the box of a middle shaft, a left flat fork pipe and a right flat fork pipe which are used for connecting the shaft of a rear wheel, a drive shaft penetrating through the right flat fork pipe, and a triple gear which is arranged on the middle shaft and is spline fit with the middle shaft; the triple gear can slide along the middle shaft and can be respectively engaged with a shaft gear by a bevel gear and the drive shaft and engaged with the bevel gear of an overrunning clutch on the rear shaft. The bevel gear is provided with three rollers which are clamped with the star wedge joint fixed to the head of the rear shaft, which enables the rear wheel of the bicycle to rotate; the middle shaft is provided with a ratchet, and the outer sleeve is provided with an incomplete gear and a pawl which can be engaged with a small gear on a cam shaft. The utility model achieves three-stage speed change and improves speed stage; speed of the bicycle is fast and stable.

Description

Bicycle gear driving device

A kind of bicycle gears driver is the Power train of bicycle.

The bicycle of gear drive, changed the bicycle of historical chain type transmission mechanism, obvious gear-driven bicycle is than the bicycle of linked transmission, has incomparable advantage, gear-driven bicycle as Chinese patent 90208243.4, be double geared bicycle, its architectural feature: middle axle box gear transmission is a two stage speed change, and speed-changing mechanism is to utilize casing outside lever interlock shift fork to realize outer speed change; At the original flywheel of rear axle utilization, crossed-axes angle is non-orthogonal bevel gear in addition on the flywheel external diameter, and has seal bootr; About two chain stay pipes all be fixed on the journal box body, transmission shaft is by the transmission by the transmission shaft realizable force in the right chain stay pipe.But this patent also exists shortcoming and defect, and as two stage speed change, its speed change rank is low, and flywheel structure exists the footpath jumping and end pendulum amount is big, and the change of bevel gear back lash is unstable.

The purpose of this utility model is to overcome above-mentioned shortcoming or not enough and a kind of Bicycle driving device that can carry out three grades of internal speed-changings is provided.

The purpose of this utility model is achieved through the following technical solutions, it is in the middle axle box 25 at center three kinds of three teeth 3 that the number of teeth is different to be arranged with bicycle middle shaft 1, respectively with shaft gear 6 on the engagement of three cylindrical wheels, form three-stage speed change mechanism, again by a pair of bevel gear in the middle axle box 25, through the transmission shaft 9 in the chain stay pipe, with a pair of bevel gear of transmission of power to the bicycle rear axle position, driving bicycle rear by the overriding clutch structure on the rear axle rotates, its speed change system utilization is fixed on the ratchet 10 on the axis, outside ratchet, put slidably partial gear is housed, not exclusively be provided with ratchet 12 on the fluted disc, not exclusively the reservation number of teeth of tooth 11 and miniature gears 15 ratios of number of teeth are 1/4 three-stage speed change mechanism.After driven miniature gears 15 on partial gear 11 and the column type cam when pedaling, promote the fork crank motion, realize the purpose of internal speed-changing.

The utility model is the bicycle gears driver that is improved to three-step gear shift on the two stage speed change basis of the Bicycle driving device of Chinese patent 90208243.4, triple gear 3 and the axis that it is characterized in that having three different numbers of teeth of consubstantiality on axis is that spline is connected and fixed and can slides along axis, transmission again can be respectively be meshed with shaft gear 6 in the middle axle box, the bevel gear 8 that has on the shaft gear 6 on 9 of a bevel gear 5 on the gear and the transmission shafts is meshed, the bevel gear 40 of the outside of the overriding clutch 41 on the bevel gear 39 of the transmission shaft other end and the rear axle is meshed, the endoporus of gear 40 is provided with three rollers 43 and clamps with star-wheel 41 wedging methods that are fixed on the spindle nose 47 of back, thereby makes the bicycle rear transmission realize three-step gear shift.

Drive back bevel gear and overriding clutch transmission by a pair of bevel gear in the middle axle box and transmission shaft.This structure is to utilize the overriding clutch principle composition that is meshed with bevel gear, drives miniature gears 15 on the camshaft by ratchet on the axis and partial gear, and cam is intermittently rotated to a direction, drives fork and promotes three wheels and finish three-step gear shift.That is to say, on axis, be fixed with ratchet, outside ratchet, put the slip partial gear is housed, when the pedal axis turns round, driving partial gear under the effect of ratchet rotates, drive simultaneously the pinion rotation on the camshaft again, because the ratio of the reservation number of teeth of partial gear and miniature gears is 1/4 cylindrical cam intermittently to be rotated to a direction.

The utility model compared with prior art by the outer speed change of secondary, is improved to three grades of internal speed-changings, is three kinds of high speeds, middling speed, low speed, and the middling speed transmitting ratio is 1:2.4; High-speed transmission ratio reaches 35% for the 1:3.2 speedup, and low speed ratio is 1:1.7,30% variation that is fit under the different condition of slowing down, and as being fit to load-carrying, goes up a slope and uses to pedal against the wind.Aspect speed change, adopt internal speed-changing structure profit with the ratchet partial gear, cylindrical groove, cams etc. are formed internal speed-changing mechanism, as long as the pedal half cycle of kicking backward is just become a speed.Pedal the circulation speed change after the continuation; It is that non-orthogonal bevel gear structure combining has overcome footpath jumping and the unstable shortcoming of end pendulum large bevel gear back lash change that original flywheel structure exists that bicycle rear axle adopts overriding clutch principle and crossed-axes angle, have compact conformation, advantage such as steady, nimble, driving efficiency is up to 98%.Right chain stay pipe is the detouchable structure, and front end is connected with middle journal box body with nut, and the rear end is connected with right supporting cover with nut, and this Assembly ﹠Disassembly to bicycle rear is very convenient.Also for ease of maintenaince.Totally-enclosed transmission makes lubricating condition good, reduces friction, and prevents the dust corrosion, clean hygiene, and long service life, speed change is flexible, and good looking appearance is agile.

The utility model is to be cranked arm by bicycle pedal from structural principle, with external force by axis, be delivered to gear system, at the splined hole that is provided with on the axis 1 on five equilibrium spline and three wheels 3 is bearing fit, triple gear 3 not only can circumferentially be located, but also can move vertically, this triple gear 3 is made up of the spur wheel that three numbers of teeth do not wait, under the stirring of shift fork 20, and different with three numbers of teeth respectively straight tooth column individual gears realization three-step gear shift that is meshed.

Axis 1 also is fixed with ratchet 10, when axis 1 rotates backward, driving partial gear 11 by the ratchet on the partial gear 11 12 rotates backward with axis 1, two sections tooth numbers on the partial gear 11 and miniature gears 15 tooth numbers on the column type cam 16 are complementary, and cylindrical cam 16 intermittences are rotated to a direction.Roll sleeve 19 in the cam path drives shift forks 20 by dial axis 18, moves along two guide pillars, 21 intermittent reciprocatings, and shift fork 20 drives triple gear 3 again and is meshed with two gears on spur gear wheel 5 and the gear wheel shaft 6 respectively and realizes three grades of internal speed-changings.Be fixed with large bevel gear 5 and be meshed with the bevel pinion 8 that is fixed on transmission shaft 9 ends on gear wheel shaft 6, it not only can change the direction of power, and changes the rotating speed of axle.Above-mentioned two angular wheel shaft angles of cut are nonopiate transmission, with middle journal box body 25 rear portion shapes in an angle.By angle left chain stay pipe 33 is fixed on the middle journal box body 25, links to each other with rear axle one end, right chain stay pipe 29 is a free-standing.Front end is connected with middle journal box body 25 with nut 28, and the rear end is connected with right supporting 32 with nut 31.Transmission shaft 9 passes through from right chain stay pipe 29.The Assembly ﹠Disassembly bicycle rear is very convenient like this, and transmission shaft 9 rearward end are provided with back bevel pinion 39, are meshed with large bevel gear 40 thereafter.

Back gamp is taken turns the endoporus that 40 endoporus are three cylindrical formula overriding clutch outer shroud.Here it is utilizes the principle and the large bevel gear structure combining of three cylindrical formula overriding clutch, replaces original flywheel.It is to utilize three rollers 43 at star-wheel 41, and the clamped or principle of unclamping in the wedging method between large bevel gear 40 endoporus, realize automatic combination and disengagement, star-wheel 41 is fixed on an end of rear axle housing 47, and rear axle passes the right supporting cover 32 of rear axle housing 47 and one end and the left supported plate 34 of the other end fastens them together.The external force of axle box during the integral body of forming this transmission device, transmission shaft 9 will impose on is delivered on the back bevel pinion 39 in the right supporting cover 32.This bevel pinion drives large bevel gear 40 rotations that are engaged with again.Not only change the transmission direction of power, can order about three rollers 43 in large bevel gear 40 holes again,, drive star-wheel 41 rotations, thereby bicycle rear is rotated with the wedging method clamping of star-wheel 41.

Fig. 1 is the utility model structural representation.

Fig. 2 is the side-looking structural representation of Fig. 1.

Below in conjunction with accompanying drawing the utility model specific embodiment is described.

Middle as shown in drawings axle box 25 can be with using * 62 each hole of plain milling boring casing after the sintered steel cast form, right chain stay pipe 9 can be used A ₃Coiled sheet becomes pipe two ends welded joint and screw fastening, and left chain stay pipe 33 can be used A ₃Coiled sheet becomes pipe with casing 25 welding, and the also available sintered steel casting of back supporting cover 32 is connected with right flat thread with the C620 machined into, bores φ 10 holes, each pedestal cap A with the Z25B drilling machine then ₃The garden steel becomes among Fig. 1 cams 16 such as 7,2,17 to become through C620 lathe car with axis 1 usefulness 45# steel with C620 lathe car, and heat treatment T235 uses * 62 plain millings then then, mills cam groove and quarter spline and two ends and lacks face.Three wheels 3, with shaft gear 6 and incomplete tooth and miniature gears with the moulding of C620 lathe after with the smart gear shaping of Y5120 gear shifting machine, through heat treatment G52 Quenching Treatment, umbrella tooth 8,40, the available 40cr round steel car of meter become, gear-shaping is dug after heat treatment G52 Quenching Treatment with Y2312 umbrella tooth in the back, transmission shaft becomes with 45 steel cars, grinds the diameter of axle with M115 behind the heat treatment T235 again.Wear into the garden, two ends, can become the back mill remainder with Gcr15 steel car for 1 41,45,48 with * 62, after usefulness C620 lathe sanding after heat treatment C42 ° back spindle nose shell 47, chromium plating after press machine and the part punch forming.

After each parts passed examination, with 180 ° of middle journal box body 25 upsets, the axis 1 of packing into, three wheels 3 are contained on the axis, refill on ratchet 10 after loading onto pawl axis 13 ratchets 12 and torque spring 14 on the partial gear 11.Ratchet 10 usefulness spring collars are fixed on the axis, with two pedestal caps 2 and two circular nuts 4 axis is fixed on the casing 25, on gear wheel shaft 6 two small bearing brackets lids 7 of dress dual gear 5 usefulness and spool be fixed on trip ring on the journal box body 25.Then shift fork 20 is contained between two guide pillars 21 and makes its slip, load onto declutch shift shaft 18 and roll sleeve 19 on the shift fork 20, and the miniature gears 15 that matches with cam 16 is contained on the cam 16, in being fixed on two location cover for seat 17 on the journal box body.To locate cover for seat 22 and pressure spring 24 usefulness nuts 23 are fixed on the casing 25, to reach the usefulness of shift fork location.Nut 28 and nut 31 all are enclosed within and will connect cover 27 on the right chain stay pipe 29 again and be welded on the right chain stay pipe 29 with bearing carrier ring 30 and form right chain stay group welding piece 36, before bevel pinion 8 and back bevel pinion 39 be contained on the transmission shaft 9 by right chain stay pipe 29, front end is connected on the casing 25 with nut 28, welded support plate 35 on the left chain stay pipe 33 in back, with left supported plate 34, back and middle journal box body 25 weld togethers, form left chain stay group welding piece 37, star-wheel 41 pack into thrust plate 45 at rear axle housing 47, retainer 46, roller 43 pressure springs 44 are contained in order back large bevel gear 40 to be contained on the star-wheel 41 again and are fixed on the star-wheel 41 with front shroud 42 on the roller 43, are assembled into the single-piece gear driver with right supporting cover 32 of axle shelves 48--and rear axle again.

Claims

1, a kind of bicycle gears driver, comprise with the axis being in the middle axle box 25 at center three kinds of three teeth 3 that the number of teeth is different to be arranged, respectively with shaft gear 6 on three gears mesh, in have an a pair of bevel gear in the axle box 25, transmission shaft 9 is arranged in the chain stay pipe, rear axle is that a pair of bevel gear is arranged, with overriding clutch, outside ratchet, put slidably partial gear 11 is housed being fixed with ratchet 10 with spline on the axis, not exclusively be provided with a ratchet 12 on the fluted disc, partial gear 11 can be with the pinion on the camshaft reservation number of teeth and miniature gears 15 numbers of incomplete tooth 11 than the three-stage speed change mechanism that is 1/4.