Wow, You're right--I have not seen these before.

Very cool. But is there any benefit of these gears?

Tried to find some more info on it: looks like it was an idea for a new differential for a vehicle that would help with traction in the same way a (torque sensitive) limited slip differential works. I couldn't find any info on if it is superior to other differential designs or even if it is used, except that the two gear model has very low gear efficiency (a good thing in this case).>> ^spaceman:

Very cool. But is there any benefit of these gears?

>> ^Skeeve:

Tried to find some more info on it: looks like it was an idea for a new differential for a vehicle that would help with traction in the same way a (torque sensitive) limited slip differential works. I couldn't find any info on if it is superior to other differential designs or even if it is used, except that the two gear model has very low gear efficiency (a good thing in this case).>> ^spaceman:
Very cool. But is there any benefit of these gears?



I couldnt find dick all about it either. I have a fetish for gears.

I don't, and yet I stilly find these gears über-sexy. Nice find!

>> ^BoneRemake:

>> ^Skeeve:
Tried to find some more info on it: looks like it was an idea for a new differential for a vehicle that would help with traction in the same way a (torque sensitive) limited slip differential works. I couldn't find any info on if it is superior to other differential designs or even if it is used, except that the two gear model has very low gear efficiency (a good thing in this case).>> ^spaceman:
Very cool. But is there any benefit of these gears?


I couldnt find dick all about it either. I have a fetish for gears.

You used Dick and Fetish in the same quote. What does this tell us?
>> ^BoneRemake:

>> ^Skeeve:
Tried to find some more info on it: looks like it was an idea for a new differential for a vehicle that would help with traction in the same way a (torque sensitive) limited slip differential works. I couldn't find any info on if it is superior to other differential designs or even if it is used, except that the two gear model has very low gear efficiency (a good thing in this case).>> ^spaceman:
Very cool. But is there any benefit of these gears?


I couldnt find dick all about it either. I have a fetish for gears.

This type of gear is commonly used so that you can have a gear ratio (mechanical advantage) that is a variable as a function of angle of rotation of the gear. Its difficult to tell just from this video if that is happening in this case (as oppose to simply having a z-constrained contact point, not unlike a helical gear). If the contact point moves from left to right in the x direction (perpendicular to the axles, in the direction from gear center to gear center) the leverage changes and so you can have a regularly variable gear ratio, which is useful for certain applications such as periodic motion generators.

One thing I am sure many of you didn't notice is that the gear on the far right is not touching the center drive gear at all, despite it only being slightly more distant from the drive gear. Indeed it is spinning in the opposite direction while still not interfering with the drive gear. It would take an extremely small axial motion for the drive gear to transfer its torque to the right gear and away from the left, and would likely result in extremely minimal galling and gear damage since the gear is pretty much kept in proper shape. In a standard spur gear, this would require the use of huge numbers of extremely tiny teeth, which anyone who knows their solid mechanics would tell you that they are very weak compared to something like this.

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*science
*engineering

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>> ^juliovega914:
One thing I am sure many of you didn't notice is that the gear on the far right is not touching the center drive gear at all, despite it only being slightly more distant from the drive gear. Indeed it is spinning in the opposite direction while still not interfering with the drive gear.


One thing I'm sure YOU haven't noticed is the right side gear IS touching and still being driven by the center gear.

Gear 1 and gear 2 are meshed normally, with the sides of each "tooth" touching each other at more or less the "normal" way. They rotate opposite to each other.

Gear 2 and gear 3 are meshed "paradoxically", with the "point" of gear 2's tooth pushing on a point half way down the side of gear 3's tooth. They rotate the same direction.

Where 1 and 2 mesh over their entire length, 2 and 3 come in contact only at one point, 2 sliding "down" 3.

Oh fuck, you're completely right, I didn't notice that the right gear is set slightly forwards from the rest to promote that behavior. I had assumed it was being driven by some geartrain behind the board. Pretty badass, but I am sure that would be a pretty bad geartrain efficiency due to all the friction, and low lifespan as well.

What about friction? Seems like this type of gear would need a lot of lubrication and even then it just looks like it would have a lot more wear over time... then again, I have no idea.

Seriously, when we going to have a *boggle channel...

/boggled

>> ^Sagemind:

You used Dick and Fetish in the same quote. What does this tell us?
>> ^BoneRemake:
>> ^Skeeve:
Tried to find some more info on it: looks like it was an idea for a new differential for a vehicle that would help with traction in the same way a (torque sensitive) limited slip differential works. I couldn't find any info on if it is superior to other differential designs or even if it is used, except that the two gear model has very low gear efficiency (a good thing in this case).>> ^spaceman:
Very cool. But is there any benefit of these gears?


I couldnt find dick all about it either. I have a fetish for gears.

He used Dick, Fetish and Gears in the same quote, does that mean it grinds his gears?

Watching this video and reading these comments has left me feeling a little, er, aroused. *worries*

>> ^juliovega914:

This type of gear is commonly used so that you can have a gear ratio (mechanical advantage) that is a variable as a function of angle of rotation of the gear. Its difficult to tell just from this video if that is happening in this case (as oppose to simply having a z-constrained contact point, not unlike a helical gear). If the contact point moves from left to right in the x direction (perpendicular to the axles, in the direction from gear center to gear center) the leverage changes and so you can have a regularly variable gear ratio, which is useful for certain applications such as periodic motion generators.
One thing I am sure many of you didn't notice is that the gear on the far right is not touching the center drive gear at all, despite it only being slightly more distant from the drive gear. Indeed it is spinning in the opposite direction while still not interfering with the drive gear. It would take an extremely small axial motion for the drive gear to transfer its torque to the right gear and away from the left, and would likely result in extremely minimal galling and gear damage since the gear is pretty much kept in proper shape. In a standard spur gear, this would require the use of huge numbers of extremely tiny teeth, which anyone who knows their solid mechanics would tell you that they are very weak compared to something like this.


I came back just to upvote your comment, I almost forgot

>> ^ponceleon:

What about friction? Seems like this type of gear would need a lot of lubrication and even then it just looks like it would have a lot more wear over time... then again, I have no idea.


No biggie. A rear differential is half or more full of fluid already. If lubrication issues are a problem all you need to do is modify the gears to draw the fluid up as it's turning. Not as hard as it seams.

>> ^Mashiki:

Not as hard as it seams.
Harder or easier than using a spellchecker?

Ouch.. my brains.

>> ^mxxcon:

>> ^Mashiki:
Not as hard as it seams.
Harder or easier than using a spellchecker?


Nah I work on a 36hr day cycle. About the time I hit 34hrs, things stop making a lot of sense. About the time I hit 35hrs, sense is gone, and so is grammar.