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Author Topic: Reverse  (Read 192 times)

Tinworm

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Re: Reverse
« Reply #15 on: 06 May 2022, 10:05:05 pm »
If the reverse freewheels when the CK is moving forwards, then trying to move it in reverse would not do anything. If you free wheel on a bike and reverse pedal nothing happens

oh yeah

mmmmm thinking

Tinworm

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Re: Reverse
« Reply #16 on: 06 May 2022, 10:09:59 pm »
If you pedal a bike it moves forward...

if you stop the pedals, it coasts in freewheel

If you reverse that

when you pedal, the kart goes backwards. Stop the pedals or turn them backwards and it freewheels


When my kart is driving forwards it is like a bicycle that is being pushed along without the cranks turning

What am I missing here?

Jimr1999

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Re: Reverse
« Reply #17 on: 06 May 2022, 10:14:42 pm »
If you pedal a bike forwards, it carries on forwards when the pedals are freewheeling - if you try and push a bike backwards the pedals go backwards with it as the pawls on the freehub engage.

So, if you pedal a cyclekart backwards, it will continue to go backwards with momentum on the freewheel, but drive it forwards and the freehub engages on the pawls and tries to turn the pedals?
... You can lead a horse to water, but a pencil must be lead.

Tinworm

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Re: Reverse
« Reply #18 on: 06 May 2022, 10:18:07 pm »
oh

Tinworm

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Re: Reverse
« Reply #19 on: 06 May 2022, 10:20:13 pm »
I need to play with my bike tomorrow and think this through

Ian F

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Re: Reverse
« Reply #20 on: 07 May 2022, 09:00:21 am »
If it wont work, then an adaptation of your analogy of a ratchet may work.  Have the drive and driven sprocket with a chain, but no freewheel, just simply rotating in either direction.  But weld a socket on the driven sprocket, then just insert a ratchet into the socket when you want to reverse.


Tinworm

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Re: Reverse
« Reply #21 on: 07 May 2022, 11:02:14 am »
If it wont work, then an adaptation of your analogy of a ratchet may work.  Have the drive and driven sprocket with a chain, but no freewheel, just simply rotating in either direction.  But weld a socket on the driven sprocket, then just insert a ratchet into the socket when you want to reverse.

Interesting - I like your idea, Ian. My inspiration car had drive bands on both sides. I was planning on having at least one dummy one, with the back wheel driving the bogey, rather than vice versa. If I was to have a chain drive in the same position, as you say, I could have a lever on the inside (I will be shoulder-deep in the cockpit, so won't be able to lean out to operate one), but will there be objections to my chain whizzing round, externally, at 40mph?
« Last Edit: 07 May 2022, 11:33:07 am by Tinworm »

TheGiantTribble

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Re: Reverse
« Reply #22 on: 07 May 2022, 11:44:33 am »
Just throwing this out there...and be warned I'm not fully awake yet!!!
What if you have a ratchet on the hand lever as well.
So when the cart is going forwardthe lever stays still, but when you pull the lever back
both the ratchets engauge and backwards you go

Like I say, bit early and probably missing something obvious.

Tinworm

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Re: Reverse
« Reply #23 on: 07 May 2022, 12:03:49 pm »
Just throwing this out there...and be warned I'm not fully awake yet!!!
What if you have a ratchet on the hand lever as well.
So when the cart is going forwardthe lever stays still, but when you pull the lever back
both the ratchets engauge and backwards you go

Like I say, bit early and probably missing something obvious.

:) I like it, if the bearings etc can handle the freewheeling speed?

Jimr1999

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Re: Reverse
« Reply #24 on: 07 May 2022, 12:16:59 pm »
Same problem as one, either they both lock when you go forwards or you can't engage drive backwards. It is the fact the axle rotates backwards on a freehub and therefore drives " the pedals around" you have to overcome
... You can lead a horse to water, but a pencil must be lead.

Graham Hill

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Re: Reverse
« Reply #25 on: 07 May 2022, 12:52:39 pm »
I pondered over this issue a couple of years ago. My idea was to introduce an intermediate sliding cog/sprocket that would engage by cable linkage from the handle on the lever . Squeeze the handle and pull backwards on the lever for reverse, release the handle and it would return to freewheel.
If somebody with better engineering skills and facility thinks that there is mileage in this please develop it further. 

Tinworm

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Re: Reverse
« Reply #26 on: 07 May 2022, 09:38:46 pm »
I pondered over this issue a couple of years ago. My idea was to introduce an intermediate sliding cog/sprocket that would engage by cable linkage from the handle on the lever . Squeeze the handle and pull backwards on the lever for reverse, release the handle and it would return to freewheel.
If somebody with better engineering skills and facility thinks that there is mileage in this please develop it further.

Nice. That sounds like the kind of thing!


Graham Hill

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Re: Reverse
« Reply #27 on: 08 May 2022, 07:07:47 am »
I pondered over this issue a couple of years ago. My idea was to introduce an intermediate sliding cog/sprocket that would engage by cable linkage from the handle on the lever . Squeeze the handle and pull backwards on the lever for reverse, release the handle and it would return to freewheel.
If somebody with better engineering skills and facility thinks that there is mileage in this please develop it further.

Just recalled my idea at the time. See my DAD drawing (Da Vinci Aided Design).
The mechanism results in a constant chain drive alongside (or inside the vehicle), but bicycle components should make it lightweight and not too power draining?
I have collected all the bits somewhere, but a little like Da Vinci ..... it never quite got off the ground.

Jimr1999

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Re: Reverse
« Reply #28 on: 08 May 2022, 07:39:59 am »
Nice idea Graham,
How about a hybrid of the original idea and that... Put in a neutral on the axle like some MTB downhill and stunt riders do on a bike...

Or https://www.youtube.com/watch?v=utP67SpMTw4
« Last Edit: 08 May 2022, 07:45:00 am by Jimr1999 »
... You can lead a horse to water, but a pencil must be lead.

Tinworm

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Re: Reverse
« Reply #29 on: 08 May 2022, 12:26:55 pm »
thinking outside the box, here, but what if you had a brake caliper on a pivot or on a quadrant (something that allows for some degree of rotation), then you have a brake disc on the axle/drive shaft....then when you pull a lever back it activates a brake, which seizes the disc and the lever (or a linkage) pushes the disc backwards. Push the lever forwards and it disengages the brake and pulls the caliper forwards ; pull it back again and the caliper re-engages (at say half past nine) and pushes the disc round (to say, ten past 12).

Do you see? It is like a mechanical way of grabbing the wheel without gears etc