Lego Technic ADT 5 - Automatic Shifting with Linear Torque Detection

Several automatic gearboxes featuring both back-end (prototype 1) and front-end (prototype 2) linear torque detection. An opposing spring-worm pair is used to detect resistance on the 8t driven gear. A sliding pulley wheel (with modified frictionless axle hole) functions as a custom transmission ring shifter. This requires less than one stud of linear motion, which most springs are able to achieve. Front-end torque detection allows faster output speeds, but fails to shift under sudden high load because output must turn while shifting.

*the spring used is not an official Lego part; it is replaceable with a Lego shock absorber

A related stepper mechanism:
   • Lego Technic Stepper Mechanism (with Built...  

A related shifting mechanism (Technic Brick Power):
   • Lego 2 Speed Automatic gearbox -  worm gea...  

Back-drive prevention mechanism (Technic Brick Power):
   • Lego Technic smoothly switching 2 speed au...  

Torque creation mechanism (Technic Brick Power):
   • Lego Technic torque in practice - how to w...  

0:00 Prototype 1.1
1:36 Prototype 1.2
1:56 Prototype 1.3
4:45 Concept Car 1.3
7:22 Prototype 2 Design
7:51 Prototype 2.1
8:37 Prototype 2.2
9:49 Prototype 2.3
12:59 Concept Car 2.3
15:27 Prototype 2.4
17:55 Prototype 2.5
18:21 Concept Car 2.5
20:02 Subscribe!

Music in this video: 备兴天下