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#11
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washer with a little hook in rear fork tracks
On 4/25/2018 10:29 AM, Emanuel Berg wrote:
AMuzi wrote: Fichtel & Sachs Duomatic has a brake arm. Torpedo Dreigang has a flatted axle with no-turn washer. Ha ha! Torpedo 3 has no-turn washers in the flat axle/washer sense but not with the little hook that the Shimano Nexus 3 no-turn washers have. And Dreigang has a brake arm as well! There are several ways to extend axle flats with a no-turn washer. None work any better than the others. It's a very simple problem, as Frank clearly explained. -- Andrew Muzi www.yellowjersey.org/ Open every day since 1 April, 1971 |
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#12
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washer with a little hook in rear fork tracks
AMuzi wrote:
There are several ways to extend axle flats with a no-turn washer. None work any better than the others. The reason to do it is 1) to keep it all together and 2) if it gets loose, it won't get *that* loose? -- underground experts united http://user.it.uu.se/~embe8573 |
#13
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washer with a little hook in rear fork tracks
On 4/25/2018 12:36 PM, Emanuel Berg wrote:
AMuzi wrote: There are several ways to extend axle flats with a no-turn washer. None work any better than the others. The reason to do it is 1) to keep it all together and 2) if it gets loose, it won't get *that* loose? 23 April, in the first reply of this thread, Frank Krygowski wrote: "Internally geared hubs exert torque on the bike frame or dropouts in certain gears. If the axle has flat surfaces and the washer's inner hole has matching flats, I think the washers you describe are a way the hub transmits that torque to the frame." With the patience of a saint, Mr Krygowski expanded on that in his reply 24 April: "With a derailleur hub or a single speed hub, the torque applied to the wheel by the chain and sprocket is the same value as the torque applied by the tire's friction force acting on the tire+wheel radius. Of course, the dirctions are opposite. We engineers would say the sum of the torques must be zero, at least for constant velocity situations. When you shift an internal gear hub to a lower gear, the gear hub applies more torque to the wheel than is applied by the chain and sprocket. That must be generated by a reaction torque from the dropouts (or on some hubs, from a reaction arm attached to a chainstay, etc.). " People have devised different styles to do that: https://www.bicyclehero.com/media/ca...d/8/4/8475.png http://images.modernbike.com/256/main_2126212142.jpg https://fasterbikes.eu/738-thickbox_...pare-parts.jpg http://www.ucycle.com/merchant/2856/.../Capture47.PNG and of course the original design: http://i.ebayimg.com/17/!BnNUOswCGk~$%28KGrHqUOKicEtluYLPB6BLio-KnEdQ~~_35.JPG the exact shape doesn't matter except where axle-to-frame position is critical, such as inside-cable designs like this: http://cdn.modernbike.com/Product_Im...arge_49040.jpg which are color-coded for various angles. -- Andrew Muzi www.yellowjersey.org/ Open every day since 1 April, 1971 |
#14
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washer with a little hook in rear fork tracks
AMuzi wrote:
People have devised different styles to do that: https://www.bicyclehero.com/media/ca...d/8/4/8475.png http://images.modernbike.com/256/main_2126212142.jpg https://fasterbikes.eu/738-thickbox_...pare-parts.jpg http://www.ucycle.com/merchant/2856/.../Capture47.PNG and of course the original design: http://i.ebayimg.com/17/!BnNUOswCGk~$%28KGrHqUOKicEtluYLPB6BLio-KnEdQ~~_35.JPG the exact shape doesn't matter except where axle-to-frame position is critical, such as inside-cable designs like this: http://cdn.modernbike.com/Product_Im...arge_49040.jpg which are color-coded for various angles. They look mostly the same to me. Partly flat axle hole, sometimes with a protruding part as well. -- underground experts united http://user.it.uu.se/~embe8573 |
#15
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washer with a little hook in rear fork tracks
They look mostly the same to me. Partly flat
axle hole, sometimes with a protruding part as well. So the answer to my original post would/could be, "the reason for the little hook is to hook into the frame's dropout track in order to further hinder the washer from rotating/falling out, should the dome/axle nut come loose. However to this end the hook is a second-rate feature because the most important thing is to have a flattened axle and no-turn washer, with or without a hook, but always with a flattened axle hole"? -- underground experts united http://user.it.uu.se/~embe8573 |
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