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Found 9 results

  1. This video applies gearbox, torque, and gearing ratio theory to design a prototype 2 speed automatic gearbox. First I describe the main components of an automatic gearbox, namely a gearing ratio selector and a torque detector. The ideal gear switch over torque point is described in terms of the PF motor torque and speed operating point, as well as the ideal gear switching ratio for the 2nd gear of the automatic gearbox. A technique for creating the 2nd gear is described by either adding to a differential by engaging a gear, or by subtracting by disengaging the gear. Issues around torque friction making it difficult to disengage a gear are mitigated by speeding up the gear switching axle to reduce torque. A torque detection method is shown using a differential for torque detection and driving a rotary catch back to the gear selector to change gears. A strategy is shown to reduce the torque and power loss due to the torque detector by placing it on a secondary path from the main power path. Finally an actual implementation of a 2 speed automatic gearbox is demonstrated and tested using a configurable torque generation mechanism using a series of clutch gears.
  2. Hi all, here's a video I did where I use a 10 level torque gadget I created to run some torque experiments to help improve my automatic gearbox designs. Hope you find it interesting.
  3. Hi all, I have created a video of some generic torque and power insights in relation to trying to create a high performing 2 speed automatic gearbox for a vehicle. The most interesting insight for me was the realization of an optimal operating point for electric motors to achieve maximum output power from the motor. I also derive the power distribution of a split path torque transfer design, and demostrate some experimental results using it. Hope you find it interesting.
  4. I'm moding one of bigger official sets - making a AWD SUV. I have come into an issue with front wheel connection to AWD system. Technic chain (Bricklink part 3711) could be a possible way to solve my issue, due to freedom of gear location. But I don't know how good this part handles torque? Is it enough to have one chain, or should I get 2 in parallel to be sure it won't break or gets damaged? How many parts do I need to have 2*16gears connected on a distance of 5 studs/holes between their centers? Correct me if I'm wrong, chain works with 8, 16 and 24 teeth gears only?
  5. LifeIsLego

    Torque Designs

    Is there any very good ways to kill a axle? Right now mine pretty much doesn’t move at all :P
  6. Hello all, I have a question regarding torque distribution in all wheel drive system. Maybe someone with better knowledge could help me. I cannot build right now, so I am not able to see if it works. Let's say I would like to implement torque vectoring to the drivetrain - more torque to the rear wheels and less torque to the front ones. Am I correct that I should gear down the axle coming out from the center differential to the rear axle and gear up the axle to the front axle? Won't the wheels slip because of different rotational speed? Thank you!
  7. Only two axles through a Lego turntable (the 48452cx1) has always irritated the more experienced Technic builders, stimulating them to work out many different solutions. Actually, some really clever solutions have been found, but most of them cause too much friction or require too much space. I have succesfully tried to do an attempt too, thanks to 3D printing and a good friend, he designed the CAD model of my solution. I can say that my solution has low friction and consumes much less space in comparison to the existing solutions. More of the story and some more pictures can be found at I have made an elaborate video about the problem and the process, but I think it will be 6 well-spent minutes. At the end of the video, there is another big surprise... Something that never was possible, is possible with the new parts! To get a better idea of the part, you can find some photos here: All photo's can be found on: in a higher resolution. The CAD drawing assembly: This design is extenable to bigger versions, I think that up to 5 or 6 axles would fit through the turntable. The only problem is connecting all gears in a robust way: to 'get to the gears', the outer gears have to get a bigger diameter and the problem of space-consumivity is back. I found that the three axle design really was a good optimization between robustness, way of accessing the gears and maximum transported torque through them. It is my hope that the Lego group takes over this idea and starts producing it, because especially the three-axle option ore the two-axles through the small turntable could be very useful in an upcoming Lego flagship. So, if you happen know someone at the Lego Technic department, please give him/her a good impression of the idea!
  8. So you may know from a previous topic of mine, that I am involved in the RC hobby as well as Lego Technic. However after buying a much more powerful RC buggy I have decided to try and find a easy way to modify an M motor for more speed and torque. I thought maybe if I bought a second extension cable and I connect one M motor to two rechargeable batteries it would give more speed and torque. Is this the case or do I have to do some internal modifications? Also so you can better understand what I want to use this for..... I would like to make a mini monster truck, about 8-9 inches long, but most of all I want it to be able to do wheelies from a standing start with a wheelie bar connected to some soft 6.5 springs to hold the wheelie. If you have any ideas please share them, thanks!
  9. After my most recent toyota hilux trial buggy build, I wanted to build a simple trial truck that was very strong. My goals were: No gear "grind" in steering or drivetrain Powered by XL motor and steered by M Normal battery box (non-lipo) No special parts so that many people can build The strongest (in my opinion) suspension type is ball-joint with reinforcing link. So I used my ball joint suspension idea with internal gear reduction from last year: Total gear reduction is 3:25 on 1x PFS XL. It has very good suspension and climbing capabilities, as well as meeting all my goals of no gear grind in steering or drive. Video: