CN2133514Y

CN2133514Y - Bicycle with multi-level gearshift, double crank connecting rod transmission mechanism

Info

Publication number: CN2133514Y
Application number: CN 92209623
Authority: CN
Inventors: 邱长安
Original assignee: Individual
Current assignee: Individual
Priority date: 1992-05-16
Filing date: 1992-05-16
Publication date: 1993-05-19
Anticipated expiration: 2002-05-16

Abstract

The utility model relates to a bicycle with multi-level gearshift and double crank connecting rod transmission mechanisms, which is characterized in that a transmission mechanism comprises a transmission gear box 12 in which a centre shaft 11 is used as a driving shaft, and digroup crank connection rod transmission mechanisms arranged on the output shaft 14 of the transmission gear box and a rear wheel 9. The crank connecting rod mechanism is composed of two cranks 15a and 15b arranged on the both ends of the output shaft 14, connection rods 16a and 16b which are respectively connected with the cranks in the form of shoveling and eccentric bearings 17a and 17b which are connected with the connection rods. In addition, the eccentric bearings 17a and 17b are arranged on the both ends of a rear shaft 10. The rear wheel 9 is arranged in the middle of the rear shaft 10 and is assembled with the rear shaft integrally, the rear shaft 10 is connected with the inner rings of the eccentric bearings, and the eccentric bearings can make eccentric motion around the shaft center O of the rear shaft 10. The bicycle has the advantages of large thrust, labor saving, variable velocity and convenient installation and disassembly.

Description

Bicycle with multi-level gearshift, double crank connecting rod transmission mechanism

The utility model is a kind of bicycle that has multi-change speed, two set of bell cranks jointed gear units, relates to technical field of bicycles.

Bicycle now commonly used, the chain drive that its transmission device is made up of sprocket wheel, chain, flywheel, it has advantages such as simple in structure, easy to maintenance, that price is low, therefore is subjected to people's favor for a long time always.But the chain long-term use is yielding, is especially exerting oneself then more yieldingly when excessive, even can influence its life-span, and make the vehicle at broken country with this bicycle, require great effort very much during up-hill journey, and do tourism, physical training time spent, speed is too slow, and still requires great effort, so can not meet the demands.

The purpose of this utility model is to design a kind of speed and can multistagely changes, the bicycle of the novel transmission mechanism of laborsaving and dress, convenient disassembly.

The purpose of this utility model is to realize like this, locate to be provided with a speed-change gear box at axis (imput shaft), the ratchet that is provided with on coupling by this case middle gear and the output shaft makes output shaft speed obtain changing, and unidirectional rotation, differ the crank of 90 degree then in two angles of output shaft two end devices, this two crank is respectively by two connecting rods hinged with it, forms two groups of (two groups) double crank jointed gear units with two capacity eccentric bearings that are installed on the rear axle two ends that two connecting rods therewith are connected respectively.Rear axle and its group are that the bicycle rear of one pushes away under the drive of drawing at these two groups of double crank jointed gear units one, and it is very convenient that rotation, and piston crank mechanism is easily adorned, torn open.

The utility model has the advantages that: laborsaving, velocity of rotation is fast, the efficient height, and variable-ratio can not produce transmission speed that the distortion because of Transmission causes than the disadvantage that changes, and installation, maintenance is all very convenient.

With accompanying drawing and realization example structure is described in detail below

Description of drawings

Fig. 1 integral structure scheme drawing of the present utility model.

The structural representation of Fig. 2 speed-changing gear box of the present utility model.

Fig. 3 is the birds-eye view of Fig. 2.

Fig. 4 is the mechanism principle figure of two group drag links.

Fig. 5 is rear axle and the structural representation that is placed in two capacity eccentric bearings on the rear axle.

Fig. 6 is the lateral plan of Fig. 5.

Among the figure: 1 front-wheel, 2 front axles, 3 front forks, 4 handgrips, 5 driving levers, 6 steel ropes, 7 supports, 8,9 trailing wheels, 10 rear axles, 11 axis, 12 gears case, 13,14 output shafts, 15a, 15b crank, 16a, 16b connecting rod, 17a, 17b capacity eccentric bearing, 18 pedals, 19a, 19b bearing seat, 20 ratchets, 21 nuts, 22 pins

By Fig. 1～4 as seen, the utility model is made up of front-wheel 1, front axle 2, front fork 3, handgrip 4, support 7, seat 8, trailing wheel 9, rear axle 10, axis 11, pedal 18 and transmission device, it is characterized in that it is the speed-changing gear box 12 of imput shaft that transmission device comprises with axis 11, speed-changing gear box 12 is right and be arranged on the output shaft 14 and the ratchet 20 that is meshed with a gear of axle 13 is formed by being arranged at the above engaging gear of two couples on axis 11 and axle 13 and the output shaft 14; Two set of bell cranks connecting rod mechanisms are by two crank 15a that are arranged at output shaft 14 two ends, 15b and crank 15a, 15b is hinged connecting rod 16a respectively, 16b reaches and 16a, the capacity eccentric bearing 17a that is installed on rear axle 10 two ends that the 16b other end is connected, 17b forms, the initial angle of two piston crank mechanisms differs 90 degree, rear axle 10 is arranged at the diaxon bearing 19a of support 7,19b, trailing wheel 9 is arranged in the middle of the rear axle 10 and with rear axle and is assembled into one, described capacity eccentric bearing 17a or 17b are that inner ring diameter is bigger, and the eccentric bearing that can make eccentric motion on the rear axle 10 around the axle center of rear axle 10 O that is linked to.

Be arranged at respectively between bearing seat 19a, 19b and the trailing wheel 9 by Fig. 5,6 visible capacity eccentric bearing 17a, 17b, can stablize the both ends of the surface that are arranged on the rear axle at capacity eccentric bearing 17a, 17b and be provided with flange 17a1,17a2,17b1,17b2 so that it well is connected with rear axle 10 and trailing wheel 9 in order to assemble the back capacity eccentric bearing.

By Fig. 1,2 as seen, this bicycle can make gear cluster change coupling reach speed change by driving lever 5, steel rope 6, Figure 3 shows that three-step gear shift embodiment.When driving lever 5 drives steel ropes 6 and moves, can be by shift fork (not shown) mechanism commonly used, making cogs at axle 11,13 moves axially, and realizes new gear mesh, thereby realizes speed change.

As seen from Figure 5, this pair set of bell cranks connecting rod mechanism fuses in order to make capacity eccentric bearing 17a, 17b and trailing wheel 9, rear axle 10.One long pin 22 can be set in its connection to be realized.Adorning, tear open, when keeping in repair, need only turning on nut 21, take out pin 22, just can easily capacity eccentric bearing 17a, 17b, rear axle 10, trailing wheel 9 be decomposed, this shows that the assembling maintenance of this mechanism is all very convenient.

This advantage voluntarily is the toggle drive trailing wheel rotation that is differed from 90 degree by two groups of initial position angles, push away under the two-way power effect of drawing at one of toggle during motion, motive force is big, province's force efficiency height, and the disadvantage of not having the dead point, with the chronotropic action of change gear box, just can make this car satisfy the requirements such as tourism, hilly ground use, physical training in addition.

Claims

1, a kind of multi-change speed, two groups of double crank jointed gear unit bicycles are by front-wheel 1, front axle 2, front fork 3, handgrip 4, support 7, seat 8, trailing wheel 9, rear axle 10, axis 11, pedal 18 and transmission device are formed, it is characterized in that it is the speed-changing gear box 12 of imput shaft that transmission device comprises with axis 11, form with two group (two groups) piston crank mechanisms that are installed on speed-changing gear box output shaft 14 and the trailing wheel 9, speed-changing gear box 12 is right by the above engaging gear of two couples that is arranged on axis 11 and axle 13 and the output shaft 14, with be arranged on the output shaft 14, and the ratchet 20 that is meshed with a gear of axle 13 is formed; Two set of bell cranks connecting rod mechanisms are by two crank 15a that are arranged at output shaft 14 two ends, 15b and crank 15a, 15b is hinged connecting rod 16a respectively, 16b reaches and 16a, the capacity eccentric bearing 17a that is installed on rear axle 10 two ends that the 16b other end is connected, 17b forms, the initial angle of two piston crank mechanisms differs 90 degree, rear axle 10 is arranged at the diaxon bearing 19a of support 7, on the 19b, trailing wheel 9 is arranged in the middle of the rear axle 10 and with rear axle and is assembled into one, described capacity eccentric bearing 17a or 17b are that inner ring diameter is bigger, and the eccentric bearing that can make eccentric motion on the rear axle 10 around the axle center of rear axle 10 O that is linked to.

2, by the described bicycle of claim 1, it is characterized in that the capacity eccentric bearing in the described piston crank mechanism is arranged between bearing seat 19a, 19b and the trailing wheel 9, the two ends of capacity eccentric bearing are equipped with flange 17a1,17a2 or 17b1,17b2.