Meatman Posted May 13, 2011 Posted May 13, 2011 I have been looking for ideas for a basic car project with the kids and I came across this setup, but I am not sure exactly what is going on here, or if in fact this design works. What I would think would be a simplistic 4 speed design appears to be more complicated than it should be. LINK Quote
allanp Posted May 13, 2011 Posted May 13, 2011 (edited) From looking at the picture, the right set of gears transmits power to the 20t bevel gear whilst the left gears transmits power to the 12t bevel gear. This gives you the different speed ratios (12:20, or 3:5 I should say) between front and rear pairs of synchros. You are right, it is more complex than it needs to be. But at least it's different. Sooooo many MOCs use the flawed* setup used in the 8448. Problem is, this setup has the same flaw but 4 times over . *flawed meaning two gears are not spaced closely enough to be properly meshed causing the gears to slip, making it no good for transmitting high levels of torque. I do like the use of the new CV part tho. Hopefully it is being used as a spline shaft as the new parts work great for this. And if this model is not motorised, this gearbox should be fine just for moving a fake engine. Edited May 13, 2011 by allanp Quote
Meatman Posted May 13, 2011 Author Posted May 13, 2011 So in other words this flawed setup is no good then? I was trying to find something compact that could be used for an all wheel drive project. I am not looking to motorize it or anything, so there wouldn't be any high levels of torque being placed on any gears. Quote
olaf9198 Posted May 13, 2011 Posted May 13, 2011 So in other words this flawed setup is no good then? I was trying to find something compact that could be used for an all wheel drive project. I am not looking to motorize it or anything, so there wouldn't be any high levels of torque being placed on any gears. sariel has made this Quote
TechnicJuan Posted May 13, 2011 Posted May 13, 2011 From looking at the picture, the right set of gears transmits power to the 20t bevel gear whilst the left gears transmits power to the 12t bevel gear. This gives you the different speed ratios (12:20, or 3:5 I should say) between front and rear pairs of synchros. You are right, it is more complex than it needs to be. But at least it's different. I believe the reason why it appears to be so complex is probably because it needs to be in order to have the axle from the center differential pass between the clutch gears where the driving rings are at. I wasn't exactly sure either what he was trying to do and why there were so many clutch gears underneath until I seen THIS picture. This is actually pretty slick and I don't recall ever seeing something like this before with not having the driving ring clutch gears actually directly working off of each other. There isn't a good picture of the top gears to see how that part of this transmission is setup or what the ratios are. Quote
allanp Posted May 14, 2011 Posted May 14, 2011 (edited) Ah, well that makes a little more sense to have it that way now, thanks TechnicJuan. @ Meatman As long as you don't intend to put much power through it, like by motorising it, this gearbox should be fine. However if you want something more straight forward you could use this, which is a standard 4 speed I use for mid sized MOCs. Would fit nice into the extreme cruiser me thinks! Edited May 14, 2011 by allanp Quote
Meatman Posted July 15, 2011 Author Posted July 15, 2011 There is a video up now of this transmission actually working Quote
MarcusB Posted July 15, 2011 Posted July 15, 2011 There is a video up now of this transmission actually working Nothing overly special about that. Just a simple 4 speed with no reverse, the 8880 model had that some 15+ years ago. If you want to see something that will really knock your socks off, check out Sheepo's Bugatti or Porsche both with 7 speed transmission with reverse that can be shifted remotely. Quote
Erik Leppen Posted July 15, 2011 Posted July 15, 2011 However if you want something more straight forward you could use this, which is a standard 4 speed I use for mid sized MOCs. Would fit nice into the extreme cruiser me thinks! http://www.brickshelf.com/gallery/radbot/idea/simple_4_speed_gearbox.jpg Yes, I consider this "the default" 4-speed gearbox and I use the exact same setup in my cars. I cannot imagine anything simpler than this is possible to achieve four different gear ratios. A good thing is, it works great with 8880's white 4 x 6 gear shift plate. :) Also note it can be extended to 6 speed quite easly just by adding another pair of 8-24 gears. It won't be very realistic in terms of gear ratios but if you don't care about this, then don't make things more complicated than needed :) Quote
Paul Boratko Posted July 15, 2011 Posted July 15, 2011 Nothing overly special about that. Just a simple 4 speed with no reverse, the 8880 model had that some 15+ years ago. If you want to see something that will really knock your socks off, check out Sheepo's Bugatti or Porsche both with 7 speed transmission with reverse that can be shifted remotely. So what you are saying is that I wasted a month designing a Transmission Drive train that had already been done fifteen years ago...? If that is the case, then I must have cow manure in the crevasse where my brain is supposed to be... I am starting to wonder why I even bother to upload anything to the internet... Quote
Bulle Posted July 15, 2011 Posted July 15, 2011 So what you are saying is that I wasted a month designing a Transmission Drive train that had already been done fifteen years ago...? If that is the case, then I must have cow manure in the crevasse where my brain is supposed to be... I am starting to wonder why I even bother to upload anything to the internet... Hey look its the creator! Hi there. Quote
TechnicJuan Posted July 16, 2011 Posted July 16, 2011 Nothing overly special about that. Just a simple 4 speed with no reverse, the 8880 model had that some 15+ years ago. If you want to see something that will really knock your socks off, check out Sheepo's Bugatti or Porsche both with 7 speed transmission with reverse that can be shifted remotely. Sheepo's transmissions are also about 1/2 the size of one of Paul's cars too. Can I put my socks back on now? Quote
Meatman Posted July 16, 2011 Author Posted July 16, 2011 So what you are saying is that I wasted a month designing a Transmission Drive train that had already been done fifteen years ago...? If that is the case, then I must have cow manure in the crevasse where my brain is supposed to be... I am starting to wonder why I even bother to upload anything to the internet... Paul, you have proven yourself time after time and there is no need to let comments bring you down, your work is top notch. I actually didn't realize that was your design when I originally made this topic. I didn't put 2 and 2 together until DLuders made the topic about the chrome wheels and then noticed that you had a youtube link on your site for your new car and then it dawned on me. I think your design is very unique and from the video it appears to work extremely well. I certainly have never seen anyone do that before with the gearbox driving rings and clutch gears. Quote
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