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Ketten- und Ritzelverschleiß: Unterschied zwischen den Versionen
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Ketten- und Ritzelverschleiß (Quelltext anzeigen)
Version vom 18. Juni 2018, 11:25 Uhr
, 18. Juni 2018→Bei langen Zähnen ist es anders: Farben
(→Wie die Kette ins Ritzel greift: weiter übersetzt) |
(→Bei langen Zähnen ist es anders: Farben) |
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| Zeile 71: | Zeile 71: | ||
Wear is very different though if the sprocket has tall teeth. The chain rides up the teeth, but as the chain and sprocket wear together, the backs of the sprocket teeth become hook-shaped rather than only sloped. The profile of the worn teeth is as bold as possible while still allowing the worn chain to disengage freely. | Wear is very different though if the sprocket has tall teeth. The chain rides up the teeth, but as the chain and sprocket wear together, the backs of the sprocket teeth become hook-shaped rather than only sloped. The profile of the worn teeth is as bold as possible while still allowing the worn chain to disengage freely. | ||
The image below shows a new chain on a worn sprocket with tall teeth. At the blue arrow in the image, you can see how the teeth are hooked. Bad things happen! | The image below shows a new chain on a worn sprocket with tall teeth. At the <span style="color:blue">blue arrow</span> in the image, you can see how the teeth are hooked. Bad things happen! | ||
[[Datei:Chain-ncws-tall.jpg|center|Neue Kette auf altem Ritzel mit langen Zähnen]] | [[Datei:Chain-ncws-tall.jpg|center|Neue Kette auf altem Ritzel mit langen Zähnen]] | ||
The new, unworn chain links fit the bottom of the gaps between sprocket teeth. Chain tension from pedaling pulls the links so the rollers are trapped behind the hooked teeth. As each roller comes around to the top of the sprocket, the hook pulls it downward (red arrow), then chain tension overcomes this pull. The roller breaks loose, rolling up the back of the hook, so the hook yanks the chain backward slightly with relation to the sprocket. Then the roller pops off and the chain jumps slightly forward. This happens for every roller which comes around, dozens of times per second. The resulting roughness can be felt through the pedals. The roughness is worse than with teeth which are only sloped. | The new, unworn chain links fit the bottom of the gaps between sprocket teeth. Chain tension from pedaling pulls the links so the rollers are trapped behind the hooked teeth. As each roller comes around to the top of the sprocket, the hook pulls it downward (<span style="color:red">red arrow</span>), then chain tension overcomes this pull. The roller breaks loose, rolling up the back of the hook, so the hook yanks the chain backward slightly with relation to the sprocket. Then the roller pops off and the chain jumps slightly forward. This happens for every roller which comes around, dozens of times per second. The resulting roughness can be felt through the pedals. The roughness is worse than with teeth which are only sloped. | ||
One tooth and one roller take all of the drive force as the roller is climbing the tooth, resulting in accelerated chain wear. The roller rolls farther. Power is lost to excess roller motion and to vibration. | One tooth and one roller take all of the drive force as the roller is climbing the tooth, resulting in accelerated chain wear. The roller rolls farther. Power is lost to excess roller motion and to vibration. | ||
Now let's also look at the bottom of the sprocket. Where the chain is about to engage (green arrow), its forward position due to other rollers' being behind the hooks places a roller on top of a tooth. If the tension on the lower run of chain is high enough to force the link into engagement, then additional power is lost as the roller pops onto the tooth, pulling the chain slightly backward. If the lower run is slack, the roller and the others behind it come around to the top sitting on top of the teeth, and then the chain jumps forward by one tooth with a clunk. | Now let's also look at the bottom of the sprocket. Where the chain is about to engage (<span style="color:green">green arrow</span>), its forward position due to other rollers' being behind the hooks places a roller on top of a tooth. If the tension on the lower run of chain is high enough to force the link into engagement, then additional power is lost as the roller pops onto the tooth, pulling the chain slightly backward. If the lower run is slack, the roller and the others behind it come around to the top sitting on top of the teeth, and then the chain jumps forward by one tooth with a clunk. | ||
A new chain on a hooked sprocket may behave well when the cranks are given a test spin on the workstand, but jump forward under power. This may happen with only some sprockets on a derailer-equipped bicycle, not with others, as they may have unequal wear. | A new chain on a hooked sprocket may behave well when the cranks are given a test spin on the workstand, but jump forward under power. This may happen with only some sprockets on a derailer-equipped bicycle, not with others, as they may have unequal wear. | ||
