CN2240485Y - Automatic speed-changing device for bicycle - Google Patents

Abstract

The utility model belongs to an automatic speed-changing device for a bicycle, which solves the problem that the previous speed-changing device for a bicycle has complicated structure and needs selecting speed ratio by people. The utility model is composed of a propulsion dish, a hole plate, a friction disk, a driving shaft, a sliding bevel gear, a bearing, a slip cap, a shift fork wheel, a centrifugal rod, a centrifugal ball and big and small bevel gear wheels, wherein, the propulsion dish, the hole plate and the friction disk are arranged on a centre shaft, the sliding bevel gear, the shift fork wheel and the small bevel gear wheel are arranged on the driving shaft, the sliding bevel gear is engaged with the hole plate, and the big bevel gear wheel is engaged with the small bevel gear wheel. The utility model can automatically change speed, applicable for bicycles or other human powered vehicles.

Description

Automatic bicycle speed variator

The utility model belongs to a kind of transmission system in the mechanical field, and exactly it is a kind of automatic shift device of bicycle.

At present, the transmission system of commercially available bicycle is chain gear mostly, is undertaken by the jumping chain on the control cone pulley, the structure more complicated of axle speed change, speed range is also narrower, in addition, above-mentioned transmission system all needs the people to select speed ratio for pulling varying speed switch, and it is not too convenient to use.

The purpose of this utility model just provides a kind of relatively simple for structure, by the automatic bicycle speed variator of axle speed change.

The utility model is to realize like this, it is by pushing disc, porose disc, the porose disc cover, spring, grinding disk, transmission shaft, the awl gear slides, garden post key, ring washer, bearing, bearing seat, coupling sleeve, forked plectrum wheel, slip cap, fixed cover, centrifugal bar, centrifugal globe, little axle, small conical gear, flat key, Spring Card, large conical gear, the speed change assistive device is formed, and it is characterized in that pushing disc 1, porose disc 2, porose disc cover 3, spring 4, grinding disk 5 is installed on the axis, slip finishing bevel gear cuter 7, bearing 10, adapter sleeve 11, forked plectrum wheel 12, slip cap 13, fixed cover 14, bearing 18, small conical gear 20 are installed on the transmission shaft 6, and the awl gear 7 that slides is nibbled platform mutually with porose disc 2, forked plectrum wheel 12 couplings yoke, centrifugal globe is installed on the centrifugal bar, and centrifugal bar is installed on fixed cover 14 and the slip cap 13, is installed in the small conical gear 20 and large conical gear 23 engagements of transmission shaft end.Speed change assistive device 24 is made up of two ingear semi-circle gears and counterweight handle and shifting fork bar, and the counterweight handle is connected with two semi-circle gears respectively with shifting fork bar, and semi-circle gear is fixed in the bicycle body.

The utility model has the advantages that: simple in structure, do not need when riding artificially to handle speed change, but automatic speed changing, increase and decrease shelves preface are successively arranged, and can get over the shelves speed change along with the variation of speed.When people ride, can feel easy, be suitable for.

Below in conjunction with accompanying drawing the utility model is done further detailed description.

Fig. 1 is the utility model integral structure scheme drawing.

Fig. 2 is the utility model forebody structural representation.

Fig. 3 is the latter half of structural representation of the utility model.

Fig. 4 is a slip finishing bevel gear cuter scheme drawing in the utility model.

Fig. 5 is a pushing disc scheme drawing in the utility model.

Fig. 6 is a porose disc scheme drawing in the utility model.

Fig. 1, Fig. 2 draw respectively after separated from transmission shaft.1 is pushing disc among the figure, 2 is porose disc, 3 is the porose disc cover, 4 is spring, 5 is grinding disk, 6 is transmission shaft, 7 are the awl gear that slides, 8 is cylinder key, 9 is ring washer, 10 is bearing, 11 is adapter sleeve, 12 is forked plectrum wheel, 13 is slip cap, 14 is fixed cover, 15 is centrifugal bar, 16 is centrifugal globe, 17 is little axle, 18 is bearing, 19 is bearing seat, 20 is little Knucle-gear, 21 for flat strong, 22 is Spring Card, 23 is large conical gear, 24 is the speed change assistive device, 25 is the rotten great political power in the speed change assistive device, 26 is the shifting fork bar in the speed change assistive device, 27,28 is semi-circle gear.When the cyclist rode bicycle, the rotation of pushing disc drove porose disc 2, and through the slight friction of grinding disk 5, the slip that slides on the transmission shaft is bored gear and drawn close engagement with it, and spring is compressed.After the normal engaged, porose disc 2 is thrown off with grinding disk 5, enters the driving walking states; After stopping to drive, pushing disc no longer rotates, but the rotation of transmission shaft can not stop, the awl gear that slides promptly promotes porose disc and also outwards moves forward, and the elastic force porose disc that adds upper spring simultaneously sets back at once, throws off with the awl gear on the transmission shaft, enter sliding state, be stained with cushion blocking on the pushing disc, when being used for reducing porose disc and returning rapidly and the sound that sends of pushing disc bump, this structure does not need ratchet.When revolution was low, the centnifugal force that centrifugal globe produces was less, can not affect the awl gear that slides, its invariant position on transmission shaft, transmitting ratio is also constant, after rotating speed improves, the corresponding increasing of centnifugal force that centrifugal globe produces, at this moment de-mesh not, transmitting ratio is constant, as de-mesh, moment, the awl gear that slides can be subjected to affecting of centnifugal force to slide backward engagement again, will be engaged on than in the big perforation of original circumference, has strengthened transmitting ratio.The transmission shaft revolution is directly proportional with the centnifugal force of formation, so speed is when low, and transmitting ratio is little, and transmitting ratio was big when speed was high.The speed change assistive device is to do motion rationally in order to control slip awl gear, can reasonable more speed change be provided with when making garage reach descending.Transmission shaft is vertical installation with axis and rear axle, and wheel width of cloth bar preferably adopts board-like good fortune bar.When special body shaft width between centers is big, can be designed to two sections to transmission shaft, the centre can connect with universal-joint.Be ready to have manual gear shifting also can install additional as the user.All parts all can use conventional mechanical job operation manufacturing processing, and parts such as gear, axle all need through heat treatment process.Assembling gets final product with reference to Fig. 1, Fig. 2 to get all the various parts shown in the accompanying drawing ready.

Claims (2)

1, automatic bicycle speed variator, it is by pushing disc, porose disc, the porose disc cover, spring, grinding disk, transmission shaft, the slip finishing bevel gear cuter, garden post key, ring washer, bearing, bearing seat, coupling sleeve, forked plectrum wheel, the slip teeth cover, fixed cover, centrifugal bar, centrifugal globe, little axle, small conical gear, flat key, Spring Card, large conical gear, the speed change assistive device is formed, and it is characterized in that pushing disc 1, porose disc 2, porose disc cover 3, spring 4, grinding disk 5 is installed on the axis, slip finishing bevel gear cuter 7, bearing 10, adapter sleeve 11, forked plectrum wheel 12, slip cap 13, fixed cover 14, bearing 18, small conical gear 20 are installed on the transmission shaft 6, and slip finishing bevel gear cuter 7 is nibbled platform mutually with porose disc 2, forked plectrum wheel 12 couplings yoke, centrifugal globe is installed on the centrifugal bar, and centrifugal bar is installed on fixed cover 14 and the slip cap 13, is installed in the small conical gear 20 and large conical gear 23 engagements of transmission shaft end.

2, automatic bicycle speed variator according to claim 1, it is characterized in that: speed change assistive device 24 is made up of two ingear semi-circle gears and counterweight handle and shifting fork bar, the counterweight handle is connected with two semi-circle gears respectively with shifting fork bar, and semi-circle gear is fixed in the bicycle body.

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