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Linksgewinde und Präzession: Unterschied zwischen den Versionen

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On bicycles, left-hand threads are used mainly in three places, on left pedals, right bottom bracket (BB) bearing cups, and freewheel cones, to prevent unscrewing under operating loads. Unscrewing occurs from precession, in which a round object rolling inside a circular ring in one direction will itself turn in the opposite direction.
Bei Fahrrädern gibt es im Wesentlichen drei Stellen, an denen men [[Linksgewinde]] findet:
* Linkes [[Pedal]]
* Rechte [[Tretlager]]gehäuseseite
* [[Freilauf]]konus
Diese sorgen dafür, dass sich Die Gewinde unter Last nicht selbst lösen. Dieses Lösen wird ausgelöst durch [Präzession]], in der ein rundes Objekt in einem runden Loch in einer Richtung zirkuliert und sich selbst in Gegenrichtung dreht.
 


For a pedal, a rotating load arises from downward pedaling force on a spindle rotating with its crank, making the predominantly downward force effectively rotate about the pedal spindle. What may be less evident is that even tightly fitting parts have relative clearance due to their elasticity, metals not being rigid materials, as is evident from steel springs. Under load, micro deformations, enough to cause motion, occur in such joints. This can be seen from wear marks where pedal spindles seat on crank faces.
For a pedal, a rotating load arises from downward pedaling force on a spindle rotating with its crank, making the predominantly downward force effectively rotate about the pedal spindle. What may be less evident is that even tightly fitting parts have relative clearance due to their elasticity, metals not being rigid materials, as is evident from steel springs. Under load, micro deformations, enough to cause motion, occur in such joints. This can be seen from wear marks where pedal spindles seat on crank faces.
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