3 Speed linear Gearbox

[SNIPE]

Hi,

I'm trying to make a linear 3 speed gearbox using only 3 axles max but I can only get 1 or 2 speeds.

I have 24 and 16 tooth idler gears. I'd like to have:

1st gear: 3:1 / 1:3

2nd gear: 1:1

3rd gear: 1:1.6 / 1.6:1

2nd is where neutral would normally be and the topmost 16 tooth gears are for this.

The leftmost axle is the output, the rightmost axle is the input.

However i cant get it to work. I've round 3 or 4 2 speed gearboxes but this just spins the output at the same speed.and I'm getting really confused now,

The middle axle is interesting in that its a split axle but both of the idler gears are synchronized as one drives the other. This can have a single axle too. I could also use axles but with no idlers.

However having a split axle allows me to substitute a 20 tooth idler gear and an 8 tooth idler gear.

Is there some way to do this?

Regards, S

[Zerobricks]

Check how the 8448's or 84's gearbox works and work on that

[SNIPE]

ill check that then.

can this still let me have 3 axles and one movable red clutch ring and 3 speeds?.

[Zerobricks]

The 8448/8466's gearbox has 5+R speeds, and yes there are 3 spinning axles.

[SNIPE]

wow and there all different ratios? or is it a 'fake gearbox'?

Edited September 11, 2014 by SNIPE

[cgg199]

This is an idea I worked quite a while ago now, but I've never actually built it in real life. Could someone build the gearbox to see if it will work?

The central axle is actually made up of two 4L axles. The spin independently as the grey connects is part number 62462.

In this case, the gear ratios are 3:1, 1:1 and 1:3.

The gearbox can be made more compact using this technique but this is just to show the concept.

Edited September 11, 2014 by cgg199

[SNIPE]

The central axle is actually made up of two 4L axles. The spin independently as the grey connects is part number 62462.

In this case, the gear ratios are 3:1, 1:1 and 1:3.

The gearbox can be made more compact using this technique but this is just to show the concept.

Hi,

1st and 2nd are the same speed but 3rd works.

the motor gets bogged down when its in 1st as its trying to move the 24T clutch gear.

are you using a regular 24T clutch or one without the springs so its more of an idler gear?

Edited September 11, 2014 by SNIPE

[cgg199]

I have never built the gearbox, so this was more of a tat than anything. Could the concept work though?

[arik]

Hmm the idea is nice, but I don't think it will work too well this way. The motor will be fighting against the clutch gear when in the central position. I think you'll need at least two driving rings (or moving axles).

[SNIPE]

The 8448 gearbox has like 5+ axles, 3 on top and 2 or 3 three underneath it and it has 3 clutches all 3 have neutral gear.