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Showing results for tags 'four speed gearbox'.
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New 4 speed compact gearbox - easy control
Tamas Juhasz posted a topic in LEGO Technic, Mindstorms, Model Team and Scale Modeling
Hi! Last week I had an idea of a remote controlled gearbox, which is enough compact for vehicles and has definite control: The special part is the controller, this allows the shifting from 1 to 4 with one hand. You can shift very easily by using this positions: Neutral/start: Then 1-2-3-4 gear: This gearbox sustains high torque too, there weren't any scratches when I tested with XL motor. I was thinking about a gearbox like this since long ago, to have something with four speed to build in my mocs. You don't have to know which gear is momently engaged(like in case of steppers), just select the gear you want. It can shift from any gear to any other one, doesn't matter which is the current gear. The pictures show everything about the construction and working method. Two gearbox are combined: Of cousre, the controller motors can be placed in many other way, this is just a quick solution for working. The ratios are: first gear: 5:1 reduction second gear: 3:1 reduction third gear: 1,666: 1 reduction fourth gear: 1:1 (no reduction) --> so it's the same as the popular four speed gearbox. Folder: http://www.brickshel...ry.cgi?f=518300 This video shows the working, and the shifting times(about 4 sec from 1 to 4) can be also seen: