Crank-based gearbox in development
Resource from: BikeRadar.com Likes:234
Dec 17,2012
You often hear that there is no need to reinvent the wheel, but it does seem that every other part of the bicycle is completely open for discussion. Many designers and engineers have attempted to change the basic drive train, and one of the most common solutions has been internal gearing located in the rear hub. But Polish developer Stefan Migaszewski has looked to another solution, one that puts the gearbox at the bottom bracket.
Migaszewski's solution would locate the gearbox in the bottom bracket shell, which would offer the ability to shift gears while stationary and while pedaling. This would also make it easy to go to the lowest gear at a stop, much like shifting into first gear in a car.
With three effective gears of approximately 24, 33 and 45 teeth, the efneo system as it is called would thus replace the front derailleur, but not necessarily the rear derailleur.
It is similar to Truvativ's HammerSchmidt crank, a system that offers effectively two front gears at the flick of a switch.
“We assume efneo is not a competitor to rear-wheel systems; it is rather a complementary solution,” said Wiktor Migaszewski, Stefan’s son. “With a good rear-wheel system like Shimano Nexus 8 you have 300 percent gear ratio. It is nice if you are living in a flat area, but a typical sport bike with derailleurs offers 600 percent gears ratio and this is what makes biking comfortable.”
“With efneo at the front and some other hub-based system on a rear wheel you have over 600 percent gear ratio and no derailleur,” Migaszewki told BikeRadar. “It looks better, it's easier to maintain and it gives the same comfort.”
This system would not be limited to use with a current chain system either.
“I think efneo is perfect for a belt drive system,” he added. “If paired with a rear-wheel hub gearbox, of course. If you want to pair it with a rear-wheel derailleur, you need chain because of chain skewing.”
The efneo system is patent pending in several markets and is still in the concept stage, so it won’t be seen at major trade shows such as Eurobike or Interbike in the near future. But the gearbox could be a future tech to watch for, considering the benefits it could offer.
“There are a few advantages that are common for all gearboxes - they look better and are easier to maintain,” Migaszewki added. “The main advantage over front derailleur is that it makes possible to change a gear both while pedaling and while stationary. Even if you are starting uphill you can change the gear to the lowest and starting is easier. With a derailleur it is impossible while stationary. We also assume changing gears with a front gearbox is quicker and easier than with most of front derailleurs.”
(BikeRadar.com)
【CBCC News Statement】
1.The news above mentioned with detailed source are from internet.We are trying our best to assure they are accurate ,timely and safe so as to let bearing users and sellers read more related info.However, it doesn't mean we agree with any point of view referred in above contents and we are not responsible for the authenticity. If you want to publish the news,please note the source and you will be legally responsible for the news published.
2.All news edited and translated by us are specially noted the source"CBCC".
3.For investors,please be cautious for all news.We don't bear any damage brought by late and inaccurate news.
4.If the news we published involves copyright of yours,just let us know.
1.The news above mentioned with detailed source are from internet.We are trying our best to assure they are accurate ,timely and safe so as to let bearing users and sellers read more related info.However, it doesn't mean we agree with any point of view referred in above contents and we are not responsible for the authenticity. If you want to publish the news,please note the source and you will be legally responsible for the news published.
2.All news edited and translated by us are specially noted the source"CBCC".
3.For investors,please be cautious for all news.We don't bear any damage brought by late and inaccurate news.
4.If the news we published involves copyright of yours,just let us know.
Previous Rod end bearing can handle higher tensile loads
Next ABB acquires Gresin to expand press automation solutions
Next ABB acquires Gresin to expand press automation solutions
BRIEF INTRODUCTION
Cnbearing is the No.1 bearing inquiry system and information service in China, dedicated to helping all bearing users and sellers throughout the world.
Cnbearing is supported by China National Bearing Industry Association, whose operation online is charged by China Bearing Unisun Tech. Co., Ltd.
China Bearing Unisun Tech. Co., Ltd owns all the rights. Since 2000, over 3,000 companies have been registered and enjoyed the company' s complete skillful service, which ranking many aspects in bearing industry at home and abroad with the most authority practical devices in China.
