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Das 1x1 der Trommelbremsen: Unterschied zwischen den Versionen

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Das 1x1 der Trommelbremsen (Quelltext anzeigen)

Version vom 15. November 2018, 14:16 Uhr

65 Bytes hinzugefügt ,  15. November 2018
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[[Datei:Drum-brake-IMG 7792sm.JPG|center|Verortung von Gelenk und Federn]]
[[Datei:Drum-brake-IMG 7792sm.JPG|center|Verortung von Gelenk und Federn]]


The next picture shows how a lever rotates the cam (red arrow) and spreads the brake shoes. When the brake is in use, the cable housing attaches at the C-shaped fitting which my thumb is holding, and the inner wire of the cable is clamped to the end of the lever. The hole at the end of the reaction arm is for a clamp band that secures the reaction arm to the frame or fork.
Im nächsten Bild sieht man, wie ein Hebel die Nocke (<span style="color:red">roter Pfeil</span>) rotiert und die Bremsbeläge spreizt. Wenn die Bremse im Einsatz ist, wird die Zughülle an der C-förmigen Aufnahme (dort wo der Daumen der Hand ist) gehalten und der Innenzug wird ans Ende des Hebels geschraubt. Das Loch am Ende der Drehmomentstütze ist für ein Klemmband, das die Drehmomentsütze gegen [[Rahmen]] oder [[Gabel]] sichert.


The shape of the cam affects the operation of the brake. As the elongated cam of this brake (typical of bicycle drum brakes) turns to apply the brake harder, the mechanical advantage increases. The hand lever must be pulled farther, and the force therefore does not increase as quickly as might be expected. Also as the brake shoes wear, the mechanical advantage increases. A cam with a spiral-shaped surface on each side would result in a linear relationship, more like that of other brakes, but also increased friction, so the cam might not retract the shoes, cable or hand lever.
The shape of the cam affects the operation of the brake. As the elongated cam of this brake (typical of bicycle drum brakes) turns to apply the brake harder, the mechanical advantage increases. The hand lever must be pulled farther, and the force therefore does not increase as quickly as might be expected. Also as the brake shoes wear, the mechanical advantage increases. A cam with a spiral-shaped surface on each side would result in a linear relationship, more like that of other brakes, but also increased friction, so the cam might not retract the shoes, cable or hand lever.
Bikegeissel
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