22 Aug 2014

Final Year Mechanical Engineering Project Idea: Auto Gear Shifting For Bicycle

Another idea popped up in my mind. I hope mechanical engineerings in their final year would find it useful -

How about developing an automatic gear shifting mechanism for bicycles? I am sure it will be useful to a lot of people who use bicycle as a primary means of commuting.

Mechanical Engineers - this is just my idea. What is your opinion/feedback?
Differential

Differential

Branch Unspecified
10 years ago
Yeah, the idea is a good as a major/minor project! But just confirm my understanding on this. The device will shift the gear automatically as speed changes to its predefined value. Right? 😀
kurtdaniel

kurtdaniel

Branch Unspecified
9 years ago
the idea is great..lets all help to make that technology move on. Hypertech is one company wholl surely help in here..😁
Differential
Yeah, the idea is a good as a major/minor project! But just confirm my understanding on this. The device will shift the gear automatically as speed changes to its predefined value. Right? 😀
how can we make a device which automatically shift the gear while changing the gear......may be we have to use some programming also?...


i am interested in this project....it is really a goood idea...please give suggestions how to make it....
blacrobous

blacrobous

Branch Unspecified
9 years ago
As far as i know it doesnot require any programming we could adjust it using some cam based mechanism to shift the chain to different gears at different speeds. Just a Assumption may be ideas may spring up to you guys. 😀
blacrobous
As far as i know it doesnot require any programming we could adjust it using some cam based mechanism to shift the chain to different gears at different speeds. Just a Assumption may be ideas may spring up to you guys. 😀

what i think is that basically automatic means we doesn't need to change gear manually..i.e. we have to fix the system like that for different speeds different gears adjust themself..we only have to paddle..for example i
1-5km/hr in 1st gear
5-10km/hr in 2nd gear
10-15 km/hr in 3rd gear
and above 15km/hr in 4th gear

so i think there should be a mechanism or programming type something that will change the gear....

although i also don't know abt it perfectly....😕
blacrobous

blacrobous

Branch Unspecified
9 years ago
well i suggested a mechanism that is a cam system but yeah programming would make the job easier.
akkumon

akkumon

Branch Unspecified
9 years ago
Little good is use conepully which give variable gear changing
rami ras

rami ras

Branch Unspecified
9 years ago
It must a sensor based bicycle because the rider cant control his speed 100 % depending on his desires or road condtions...
Sensors must me used to identify road conditions so that gears can move up or down...nice topic .... your comments may make the idea stronger
anu_mech

anu_mech

Branch Unspecified
9 years ago
if it has to be a purely mech based project then .....obvoiusly mechanisms should be the way to approach...like when the speed increases, a second mechanism invokes and the gear shifts
sumith123

sumith123

Branch Unspecified
8 years ago
rami ras
It must a sensor based bicycle because the rider cant control his speed 100 % depending on his desires or road condtions...
Sensors must me used to identify road conditions so that gears can move up or down...nice topic .... your comments may make the idea stronger
how we would implement
the data's of sensor in to practice
ravi002

ravi002

Branch Unspecified
8 years ago
it means programs have to b der..
ravi002

ravi002

Branch Unspecified
8 years ago
bt wat if d bicycle is suddenly stoppd... n its on 4th gear.. then to again strt the bicycle.. it wud b difficult..?
mech.engineerPK

mech.engineerPK

Branch Unspecified
8 years ago
thats fine. i think timing gear is required.
goal...

goal...

Branch Unspecified
8 years ago
That's it! As Akkumon says, cone pulley is the answer, cause depending on the speed, the centrifugal force will make the power transmitting member (i.e. belt) to slide away or towards the center, and hence varying the effective diameter.
But the only question remains is the sliding of the belt on the cone pulley - (1) and other what in case of a sudden brake, when the pulley may come to a sudden stop or reduced speed? (2)
mech.engineerPK

mech.engineerPK

Branch Unspecified
8 years ago
hmmm, so any one have answers??
tashirosgt

tashirosgt

Branch Unspecified
8 years ago
One question is whether there is actually a consumer demand for automatic gear shifting on bicycles. I'm not a cyclist, so I don't know.

It might help to review exactly how automatic transmissions work on cars. It seems to me that the driver uses the accelerator pedal to define his desire to go faster or slower, so it is aptly named "accelerator pedal" instead of "velocity pedal". Some degree of depressing the pedal indicates "don't speed up or slow down". Letting up on the pedal completely indicates a desire to slow down. Pressing the pedal down far indicates the desire to go faster.

Are we talking about have an "accelerator lever" on the handlebar to serve this function. Or is the bicycle supposed to shift gears based on the amount of force being exerted on the bicycle's pedals. Would a certain amount of force on the pedal indicate "maintain current speed"?
4 years ago
Just thought of popping up this discussion because a lot of mechanical engineering students are looking for innovative ideas. Make this work, people! 😀

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