Das 1x1 der Shimano Rollerbrake: Unterschied zwischen den Versionen

Im Bild unten sieht man die linke Seite einer Shimano [[Nexus]] Achtgang-Nabenschaltungsnabe ohne Rollerbrake. Dort sitzt eine Gummikappe ([[Staubkappe]]), die von  einer [[Mutter]] und einer ange[[flansch]]ten [[Unterlegscheibe]] am Platz gehalten wird.

  The life cycle of a brake goes something like this: add small amount of grease (pea size amount) in addition to factory grease when installing a new brake. After some months, the grease is washed away by rain. The brake is now dry and has poor or nonexistent modulation which locks the wheel with the slightest pressure on the lever. A normal consumer would regrease the brake immediately at this point, but our bikes [bike-share fleet bikes] can go a few weeks between being checked by staff. If it is being ridden dry for weeks, the drum and/or shoes are damaged beyond repair. Regreasing at this point can bring the brake modulation back to normal levels temporarily, but the brake will lose all stopping power within a few weeks or months depending on how much it is ridden.

Instandsetzung von Rollerbrakes ist von Shimnao nicht vorgesehen. Jedoch haben einige Mechaniker einen Weg gefunden, wie man es dennoch hinbekommt.

Manche bessere Rollerbrake-Modelle haben Bremsbeläge mit spitz (Dachförmig) zulaufenden Bremsflächen. Hier muss die Bremse weiter zerlegt werden, um die Beläge zu entfernen. Der Zusammenbau ist ungleich schwerer. Im unten zu sehenden Bild sieht man eine BR-IM70 Hinterradbremse - es handelt sich um das gleiche Modell wie weiter oben auf dieser Seite. Es handelt sich um eine große Rollerbrake mit spitz zulaufenden Bremsbelägen.

There are links below to a Web page and a video about disassembly and reassembly of such a brake. The video's narration is in Russian but the procedure is clear enough from the images.

Clean out the old grease with solvent. Coat the inside with Phil Wood oil and pack it with high-temperature grease before reassembling. People who are especially concerned for efficiency will leave the grease out, and use only the Phil Wood oil -- though it can drip out and make a mess, and must be replenished more frequently.

With some Rollerbrakes, the shoes must be held outward against the drum to keep the circular spring clip in place. A page linked below shows how this may be done.

As the shoes of a Rollerbrake wear, slack in the cable will increase, as with other brakes. Readjust the cable using the adjusting barrel, and as necessary, by pulling more cable through the anchor bolt. The brake is worn out when the cable cannot be adjusted to apply the brake fully, or will not retract. Shimano has a wear measuring tool. See the maintenance manual in the list above for details.

If a Rollerbrake is worn out, the entire main assembly must be replaced. Shimano doesn't offer spare parts. External parts -- nuts, bolts, adjusting barrels, clamps etc.-- are available for replacement.

 

*Video of disassembly and reassembly of a Rollerbrake with peaked brake shoes

*Web page about disassembly and reassembly of a Rollerbrake with peaked brake shoes

*Holding the shoes against the drum (read text under image)

*A blog post from Workcycles about rebuilding a Rollerbrake

*Harris Cyclery carries Nexus-equipped bicycles from several manufacturers, including: Breezer Bicycles

* Aaron's Bicycle Repair, Seattle, Washington, USA -- specializes in internal hubs

Dieser Artikel basiert auf dem Artikel [https://www.sheldonbrown.com/rollerbrakes.html Shimano Rollerbrakes] von der Website  [http://sheldonbrown.com Sheldon Browns]. Originalautor des Artikels ist [[Sheldon Brown]].

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