|
|
Thread Tools | Display Modes |
#1
|
|||
|
|||
Tomorrow's Bicycle Drive?
See https://www.youtube.com/watch?v=-9gQ1KRhesM In the narration he mentions that a 24 speed gear set, or even more, would be perfectly feasible. No wires, no cables, either. -- Cheers, John B. |
Ads |
#2
|
|||
|
|||
Tomorrow's Bicycle Drive?
On Sunday, June 2, 2019 at 5:49:03 AM UTC-4, John B. Slocomb wrote:
See https://www.youtube.com/watch?v=-9gQ1KRhesM In the narration he mentions that a 24 speed gear set, or even more, would be perfectly feasible. No wires, no cables, either. -- Cheers, John B. Seems to be a concept bicycle not an actual bicycle. I'd like to see how the bicyclist initiates a shift. I'd also like to see it in actual use. I wonder what the cost will be? Cheers |
#3
|
|||
|
|||
Tomorrow's Bicycle Drive?
On Sun, 2 Jun 2019 04:42:01 -0700 (PDT), Sir Ridesalot
wrote: On Sunday, June 2, 2019 at 5:49:03 AM UTC-4, John B. Slocomb wrote: See https://www.youtube.com/watch?v=-9gQ1KRhesM In the narration he mentions that a 24 speed gear set, or even more, would be perfectly feasible. No wires, no cables, either. -- Cheers, John B. Seems to be a concept bicycle not an actual bicycle. I'd like to see how the bicyclist initiates a shift. I'd also like to see it in actual use. I wonder what the cost will be? Cheers In the latter part of the narration he explains the shift. It is a bit complex as it apparently uses different "Paths" on the "cassette" depending on the speed of rotation. see https://www.youtube.com/watch?v=UFAQ6CzNm7s for a repeat of the above reference or google on "CeramicSpeed Driven chainless drivetrain" for about 11,000 hits. Apparently they have built at least one complete bike as one of the sites has a picture of someone riding one https://hiconsumption.com/2018/07/ce...ss-drivetrain/ In reading the fantastic claims for reduced friction one should remember that a chain drive may well have as high as 98% efficiency. https://www.cyclingpowerlab.com/Driv...fficiency.aspx So essentially the Ceramic system may provide 1% greater efficiency than a well functioning conventional system. -- Cheers, John B. |
#4
|
|||
|
|||
Tomorrow's Bicycle Drive?
On Sunday, June 2, 2019 at 8:18:56 AM UTC-4, John B. Slocomb wrote:
On Sun, 2 Jun 2019 04:42:01 -0700 (PDT), Sir Ridesalot wrote: On Sunday, June 2, 2019 at 5:49:03 AM UTC-4, John B. Slocomb wrote: See https://www.youtube.com/watch?v=-9gQ1KRhesM In the narration he mentions that a 24 speed gear set, or even more, would be perfectly feasible. No wires, no cables, either. -- Cheers, John B. Seems to be a concept bicycle not an actual bicycle. I'd like to see how the bicyclist initiates a shift. I'd also like to see it in actual use. I wonder what the cost will be? Cheers In the latter part of the narration he explains the shift. It is a bit complex as it apparently uses different "Paths" on the "cassette" depending on the speed of rotation. see https://www.youtube.com/watch?v=UFAQ6CzNm7s for a repeat of the above reference or google on "CeramicSpeed Driven chainless drivetrain" for about 11,000 hits. Apparently they have built at least one complete bike as one of the sites has a picture of someone riding one https://hiconsumption.com/2018/07/ce...ss-drivetrain/ In reading the fantastic claims for reduced friction one should remember that a chain drive may well have as high as 98% efficiency. https://www.cyclingpowerlab.com/Driv...fficiency.aspx So essentially the Ceramic system may provide 1% greater efficiency than a well functioning conventional system. -- Cheers, John B. But HOW DO YOU SHIFT? Is it a lever, a grip shifter? What? Cheers |
#5
|
|||
|
|||
Tomorrow's Bicycle Drive?
On 6/2/2019 5:48 AM, John B. Slocomb wrote:
See https://www.youtube.com/watch?v=-9gQ1KRhesM In the narration he mentions that a 24 speed gear set, or even more, would be perfectly feasible. No wires, no cables, either. I estimate that a New! Innovative! Revolutionary! Better! bicycle transmission has been invented every two years or so. -- - Frank Krygowski |
#6
|
|||
|
|||
Tomorrow's Bicycle Drive?
On 6/2/2019 11:18 AM, Frank Krygowski wrote:
On 6/2/2019 5:48 AM, John B. Slocomb wrote: See https://www.youtube.com/watch?v=-9gQ1KRhesM In the narration he mentions that a 24 speed gear set, or even more, would be perfectly feasible. No wires, no cables, either. I estimate that a New! Innovative! Revolutionary! Better! bicycle transmission has been invented every two years or so. I would expect a hypoid gear set in an oil bath to be relatively efficient compared to a chain. Any ME comments on an open crown & pinion set? -- Andrew Muzi www.yellowjersey.org/ Open every day since 1 April, 1971 |
#7
|
|||
|
|||
Tomorrow's Bicycle Drive?
On 6/2/2019 12:39 PM, AMuzi wrote:
On 6/2/2019 11:18 AM, Frank Krygowski wrote: On 6/2/2019 5:48 AM, John B. Slocomb wrote: See https://www.youtube.com/watch?v=-9gQ1KRhesM In the narration he mentions that a 24 speed gear set, or even more, would be perfectly feasible. No wires, no cables, either. I estimate that a New! Innovative! Revolutionary! Better! bicycle transmission has been invented every two years or so. I would expect a hypoid gear set in an oil bath to be relatively efficient compared to a chain. Any ME comments on an open crown & pinion set? I'm pretty sure a chain is the most efficient mechanical transmission by far. It can get over 98% efficiency under good conditions. Going entirely by memory, I think one pair of spur gears are typically 90 - 95% (depending on manufacturing accuracy), and hypoids, etc. are less. You can think of hypoids as a sort of semi-worm gear, and the more sliding contact, the more friction. Somewhere around here I may have typical numbers - unless they were donated to my successors when I retired. -- - Frank Krygowski |
#8
|
|||
|
|||
Tomorrow's Bicycle Drive?
On Sun, 2 Jun 2019 05:36:35 -0700 (PDT), Sir Ridesalot
wrote: On Sunday, June 2, 2019 at 8:18:56 AM UTC-4, John B. Slocomb wrote: On Sun, 2 Jun 2019 04:42:01 -0700 (PDT), Sir Ridesalot wrote: On Sunday, June 2, 2019 at 5:49:03 AM UTC-4, John B. Slocomb wrote: See https://www.youtube.com/watch?v=-9gQ1KRhesM In the narration he mentions that a 24 speed gear set, or even more, would be perfectly feasible. No wires, no cables, either. -- Cheers, John B. Seems to be a concept bicycle not an actual bicycle. I'd like to see how the bicyclist initiates a shift. I'd also like to see it in actual use. I wonder what the cost will be? Cheers In the latter part of the narration he explains the shift. It is a bit complex as it apparently uses different "Paths" on the "cassette" depending on the speed of rotation. see https://www.youtube.com/watch?v=UFAQ6CzNm7s for a repeat of the above reference or google on "CeramicSpeed Driven chainless drivetrain" for about 11,000 hits. Apparently they have built at least one complete bike as one of the sites has a picture of someone riding one https://hiconsumption.com/2018/07/ce...ss-drivetrain/ In reading the fantastic claims for reduced friction one should remember that a chain drive may well have as high as 98% efficiency. https://www.cyclingpowerlab.com/Driv...fficiency.aspx So essentially the Ceramic system may provide 1% greater efficiency than a well functioning conventional system. -- Cheers, John B. But HOW DO YOU SHIFT? Is it a lever, a grip shifter? What? Cheers The first reference I gave said that the "drive shaft" contained a remote receiver device which allowed shifting without wires or cable. No reference seems to have been given regarding the actual shift button, lever, whatever. -- Cheers, John B. |
#9
|
|||
|
|||
Tomorrow's Bicycle Drive?
On 6/2/2019 5:47 PM, John B. Slocomb wrote:
On Sun, 2 Jun 2019 05:36:35 -0700 (PDT), Sir Ridesalot wrote: On Sunday, June 2, 2019 at 8:18:56 AM UTC-4, John B. Slocomb wrote: On Sun, 2 Jun 2019 04:42:01 -0700 (PDT), Sir Ridesalot wrote: On Sunday, June 2, 2019 at 5:49:03 AM UTC-4, John B. Slocomb wrote: See https://www.youtube.com/watch?v=-9gQ1KRhesM In the narration he mentions that a 24 speed gear set, or even more, would be perfectly feasible. No wires, no cables, either. -- Cheers, John B. Seems to be a concept bicycle not an actual bicycle. I'd like to see how the bicyclist initiates a shift. I'd also like to see it in actual use. I wonder what the cost will be? Cheers In the latter part of the narration he explains the shift. It is a bit complex as it apparently uses different "Paths" on the "cassette" depending on the speed of rotation. see https://www.youtube.com/watch?v=UFAQ6CzNm7s for a repeat of the above reference or google on "CeramicSpeed Driven chainless drivetrain" for about 11,000 hits. Apparently they have built at least one complete bike as one of the sites has a picture of someone riding one https://hiconsumption.com/2018/07/ce...ss-drivetrain/ In reading the fantastic claims for reduced friction one should remember that a chain drive may well have as high as 98% efficiency. https://www.cyclingpowerlab.com/Driv...fficiency.aspx So essentially the Ceramic system may provide 1% greater efficiency than a well functioning conventional system. But HOW DO YOU SHIFT? Is it a lever, a grip shifter? What? The first reference I gave said that the "drive shaft" contained a remote receiver device which allowed shifting without wires or cable. No reference seems to have been given regarding the actual shift button, lever, whatever. Don't know but any of a dozen setups would work fine for that. Those of a certain age are thinking something like an electric solenoid overdrive switch: https://www.hemmings.com/blog/articl...ive-solenoids/ In our brave new world a wireless control stepper motor in side the chainstay with a handlebar up-down switch probably. -- Andrew Muzi www.yellowjersey.org/ Open every day since 1 April, 1971 |
#10
|
|||
|
|||
Tomorrow's Bicycle Drive?
On Sunday, June 2, 2019 at 11:40:05 AM UTC-5, AMuzi wrote:
I would expect a hypoid gear set in an oil bath to be relatively efficient compared to a chain. Any ME comments on an open crown & pinion set? Back in my BMW motorcycling days it was widely accepted that the shaft drive was less efficient than a chain. Not enough to make a difference in routine or even "sport" riding, but there were few shaft-driven bikes in the races. (I saw John Long place 4th the "Superbike" class at Daytona behind 3 Suzukis) I am not a mechanical engineer, but I *did* stay at a Holiday Inn Express a couple times. Nevertheless, it seems to me that the exposed nature of that "ceramic" drivetrain puts it at risk for all sorts of wear issues, not least of which the "cogs" are aluminum which wouldn't tolerate much abrasive road dust I'm thinking. Also, I would bet that a strong rider would be able to get that largest "cog" to bend by stomping on the pedal. It's a pretty thick piece, but the little bearings must have pretty good mechanical advantage, and the gear would slip and might even be permanently deformed. Not very impressive for a theoretical 1% improvement in efficiency. |
Thread Tools | |
Display Modes | |
|
|
Similar Threads | ||||
Thread | Thread Starter | Forum | Replies | Last Post |
Finally, a Proper Bicycle Drive-Train | Tºm Shermªn™ °_°[_2_] | Techniques | 2 | April 1st 11 05:29 PM |
What makes a bicycle-safe drive-up window? | [email protected] | Techniques | 0 | February 7th 08 04:05 PM |
What makes a bicycle-safe drive-up window? | Ron Wallenfang | Techniques | 1 | February 7th 08 03:25 AM |
Itera - Bringing you the bicycle of tomorrow, yesterday. | Adam Rush | Techniques | 5 | February 25th 06 07:56 AM |
Direct drive bicycle | cyberpunk | Unicycling | 7 | July 26th 05 07:21 PM |