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Lego Technic Smooth Linear Gearbox - 3 Speed + Neutral + PTO

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Published on Mar 3, 2012

A design for a Lego Technic gearbox that has 3 speeds plus neutral, and a secondary driveshaft (red). The secondary driveshaft can be used to control another piece of equipment such as a winch or crane.

The gear changes are smooth, and the teeth don't jump, grind, or bind at all. As the motion of the gear change is linear and sequential, it can easily be controlled using a Linear Actuator and an M-Motor (as shown in the video), or remote controlled using the Lego Power Functions system.

The gear ratios are:
Secondary Driveshaft = 1.66 : 1
1st Gear = 2.77 : 1
2nd Gear = 1.66 : 1
3rd Gear = 1.00 : 1
Different gear ratios can easily be achieved by changing where the drive motor is attached.

The gearbox mechanism can be built into a chassis of a vehicle quite easily. The linear actuator takes up a lot of space, but if you remove the Secondary Driveshaft and the Neutral positions, then the gearbox can be controlled using the smaller Mini Linear Actuator.

More images are available on Brickshelf : http://www.brickshelf.com/gallery/slf...

Some basic instructions are also available on Brickshelf : http://www.brickshelf.com/gallery/slf...

LDraw File: http://www.brickshelf.com/gallery/slf...

Discussion: http://www.eurobricks.com/forum/index...

NEW: Assembly video for my "Lego Technic Smooth Linear Gearbox - 6 Speed + Reverse" is now available: http://youtu.be/a5s1_rcbGBE

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