CN2209102Y

CN2209102Y - Coaxal output variable-speed device for man drawn vehicle

Info

Publication number: CN2209102Y
Application number: CN 94230975
Authority: CN
Inventors: 杨永良
Original assignee: Individual
Current assignee: Individual
Priority date: 1994-12-07
Filing date: 1994-12-07
Publication date: 1995-10-04
Anticipated expiration: 2004-12-07

Abstract

The utility model discloses a coaxal output variable-speed device for man drawn vehicles, which mainly solves the problem that the manpower output of the existing man drawn vehicles and the input impedance to the vehicles are unmatched. The utility model uses the non-circular gear transmission with the engaging type to enhance the transmission efficiency according to the state of mutually alternative working by two legs of a man, and then the power coaxal output can be realized by the step pulley speed changing. The variable-speed device has the advantage of simple and reliable structure which not only can enable a rider to taste volatility and labour saving, but also can reduce the diameter of the sprocket to enable the man drawn vehicle more portable and to be easy to install a chain box. The utility model is suitable for bicycles, tricycles, racing vehicles, hand traverse cranks or disabled person vehicles.

Description

Coaxal output variable-speed device for man drawn vehicle

The utility model relates to a kind of coaxial output change-speed box that bicycle, three-wheel vehicle or disabled person's car use that is suitable for.

Existing rickshaw generally adopts the direct sprocket wheel that drives of crank rotation to come transferring power, transfers the files speed change by the sprocket wheel of different-diameter.This type of drive has the following disadvantages: 1. people's horsepower output rotates in the one-period that encloses at crank and changes, minimum when the action direction of power F and crank angle γ=0 ° (first dead center), later along with the increase of γ, horsepower output increases gradually, ° near zone horsepower output maximum in γ=90 then reduces minimum when γ=130 ° (lower dead point) gradually; Crank rotates in the circle (360 °) and repeats the above-mentioned variation of secondary.Thereby in the invariable type of drive of this speed ratio, people's application force output and that the input of rickshaw has been produced coupling is bad, the people can not be played a role well, this phenomenon is the most obvious in the zone, dead point, especially quicken to go up a slope, against the wind the time, can't put on a spurt zone, dead point people, it is not all right often to spend the strength car in vain, causes inefficiency.2. the transmission system complexity that is adopted is that outer speed change or internal speed-changing are all made difficulty, the particularly outer chain device of dialling, and accuracy of manufacture requires high, can not be durable in use, aftermarket attachment is also very difficult.

The purpose of this utility model provides a kind of rickshaw coaxial output change-speed box, and it can improve the coupling of human body output to the rickshaw input, improves people's the force efficiency of using; Make speed-changing mechanism easier to be reliable simultaneously, handle easily, closely can reduce sprocket diameter, make rickshaw lighter.

For realizing that this purpose the utility model is periodically variable rule according to people's functioning efficiency in the crank rotation process, designed with the passive non-circular gear on the drive of the active non-circular gear on the crank shaft tween drive shaft, drive passive cone pulley and sprocket wheel on the crank shaft axle sleeve by driving cone pulley again, thereby realize the type of drive of coaxial output.The work done situation that replaces mutually according to people's both legs, the cycle life that the cycle life n1 of active non-circular gear is designed to 2. passive non-circular gears is designed to n2=1～2, crank and the installation angle α of the major axis of non-circular gear initiatively=0～30 °.Rotate in the circle at crank, because action of inertia can think that rickshaw at the uniform velocity travels, therefore in the non-circular gear transmission, the cireular frequency when efficient is high when low with efficient is different, and cireular frequency was slow when efficient was high, and cireular frequency was fast when efficient was low.So just changed the high and inefficient time ratio of efficient in the pedal crank drive mode: work-hours was long when efficient was high, and work-hours was short when efficient was low.

Advantage of the present utility model is: 1. after adopting the non-circular gear stepless variable drive, speed ratio is greater than average speed ratio near zone, upper and lower dead point, this moment, people's horsepower output was little, and the near zone speed ratio in γ=90 ° is less than average speed ratio, this moment, people's horsepower output was big, so just improved crank and rotated the inharmonic phenomenon of input and output both sides impedance in the one-period that encloses, and the zone, dead point easily overcomes.2. adopted non-circular gear and gear coaxial output mechanism, made change-speed box lighter, control comfort, not easy break-down; By the inner speedup of speed-changing mechanism, promptly the speed ratio of sprocket wheel and flywheel is designed in the change-speed box, can reduce the external diameter of sprocket wheel, make rickshaw lighter, and chain cover easily is installed.

Below in conjunction with accompanying drawing the utility model is described in further detail:

Fig. 1 is a kind of structural representation of the present utility model.

Fig. 2 is that master, ring gear are the scheme drawing of oval gear engaged transmission.

Fig. 3 is that master, ring gear are the scheme drawing of oval gear and elliptic gear engaged transmission.

Fig. 4 is that master, ring gear are the scheme drawing of non-circular gear and eccentric gear engaged transmission.

Fig. 5 is main, the working condition when the ring gear driving efficiency is high.

Fig. 6 is a working condition main, when the ring gear driving efficiency is low.

Rickshaw coaxial output change-speed box shown in the figure, make the non-circular gear engaged transmission by driving gear on the input shaft 10 that is fixed on pedal crank 61 and the ring gear 2 that is fixed on the tween drive shaft 3, the cycle life n1=2 of driving gear 1, the cycle life n2=1 or 2 of ring gear 2, angle α=0～30 between the major axis of pedal crank 6 and above-mentioned driving gear 1 °, output sleeve 9 is housed on the input shaft 10, and input shaft 10, tween drive shaft 3 and output sleeve 9 all are fixed on the vehicle frame 5.Drive passive cone pulley 8 rotations that are installed on the output sleeve 9 by the driving cone pulley 4 that is installed on the tween drive shaft 3, thereby power is passed to the output chain gear 7 that is fixed on the output sleeve 9.Recently change the output speed of sprocket wheel 7 by the driving lever 11 scalable driving cone pulleys 4 and the transmission of passive cone pulley 8.

Driving gear 1 can have following several basic structure form with the engaged transmission of ring gear 2: two oval gear engaged transmission shown in Figure 2, this moment n1=n2=2, average ratios 1 is 1:1; Oval gear shown in Figure 3 and elliptic gear engaged transmission, this moment n1=2, n2=1, average ratios 1 is 1:2, ring gear 2 is one times of speedup, can further regulate sprocket wheel 7 output speeds by cone pulley driving lever 11 again; Non-circular gear shown in Figure 4 and eccentric gear engaged transmission, this moment n1=2, n2=1, average ratios 1 is 1:2, ring gear is one times of speedup also.When Fig. 5 illustrated the power F that acts on pedal crank 6 and crank angle γ and is about 90 °, the angular velocity omega 1 of driving gear 1 was the slowest, the time expand of efficient work done; When Fig. 6 illustrated the power F that acts on pedal crank 6 and crank angle γ and is about 0 ° or 180 °, the angular velocity omega 1 of driving gear 1 was the fastest, and the time of poor efficiency work done shortens.

Claims

1, a kind of rickshaw coaxial output change-speed box, include the pedal crank, main, ring gear, main, passive cone pulley and output chain gear etc., the driving gear (1) that it is characterized in that being fixed on the input shaft (10) of pedal crank (6) is the non-circular gear engaged transmission with the ring gear (2) that is fixed on the tween drive shaft (3), the cycle life n1=2 of driving gear (1), cycle life n2=1～2 of ring gear (2), angle α=0～30 between the major axis of pedal crank (6) and above-mentioned driving gear (1) °; Output sleeve (9) is housed on the input shaft (10), drives passive cone pulley (8) rotation that is installed on the output sleeve (9) by the driving cone pulley (4) that is installed on the tween drive shaft (3), thereby power is passed to the output chain gear (7) that is fixed on the output sleeve (9).

2, rickshaw coaxial output change-speed box according to claim 1 is characterized in that said driving gear (1) and ring gear (2) are two oval gear engaged transmission, n1=n2=2.

3, rickshaw coaxial output change-speed box according to claim 1 is characterized in that said driving gear (1) and ring gear (2) are oval gear and elliptic gear engaged transmission, n1=2, n2=1.

4, rickshaw coaxial output change-speed box according to claim 1 is characterized in that said driving gear (1) and ring gear (2) are non-circular gear and eccentric gear engaged transmission, n1=2, n2=1.