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Compact freewheeling devices
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Compact freewheeling devices
About this creation
Freewheling devices are used in drivetrain of helicopters, microcars, bicycles to automatically decouple spinning rotors/wheels from idling/stalled engine:

- At bicycles it enables rolling without spinning pedals.
- At two-stroke engine powered microcars (eg. the infamous East German microcar Trabant), it eliminated engine braking, as two stroke engines run terribly badly in engine braking mode
- At helicopters (combined with centrifugal clutch) it allows starting and warming engine in idle race, while rotors are still standing. Moreover, in case of engine stalling, it disconnects spinning rotors from stalled engine, preserving rotor inertia for autorotation gliding mode being vital for successful crash-landing.

We designed two versions:

A, Smaller sized (3.38 studs diam 3 studs lenght), low torque tolerance version, which acts as a centrifugal clutch also.

B, Bigger sized (4.25 studs diam 4 studs lenght), high torque tolerance version, with ratchet mechanism controlled by rubber springs made of part 'rubber damper 211 studs'


Building instructions
Download building instructions (LEGO Digital Designer)

Comments

 I made it 
  January 21, 2014
Quoting alien shadow master These look great but I can't figure out what the green parts are in them Could you post a bricklink link to the parts or something similar to you favourite parts page?
I made it in LDD, where the name of the part is "FLAME 3.2 SWAMPFIRE" BrickID: 4570159 PartID: 88964
 I like it 
  January 21, 2014
These look great but I can't figure out what the green parts are in them Could you post a bricklink link to the parts or something similar to you favourite parts page?
 I like it 
  October 30, 2013
Really great idea!! Very good!! 5/5
 I made it 
  October 23, 2013
Quoting Technic Man Those pieses seem to be very rare... Anyway, it's really compact, and that's good. 4/5
In the second version, instead of the rare part, you can use parts 'pistol', 'Firefighter nozzle' 'T-joint' or other L-shaped small parts. But they will increase diameter of freewheeling device.
 I like it 
  October 23, 2013
Those pieses seem to be very rare... Anyway, it's really compact, and that's good. 4/5
 
By Gabor Pauler
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LEGO models my own creation MOCpages toys shop Compact freewheeling devicesTechnic


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