2024-02-12 12:48:40
In the world of electric bicycles (ebikes), belt drives represent a modern, maintenance-free alternative to traditional chains. However, a new innovation promises to revolutionize this sector even more. We are talking regarding the Shift Drive system, a technology capable of changing between two speeds, and which can also be installed on unmodified bicycle frames. This advancement is currently the focus of a campaign on Start Engine, seeking investment for its development and commercialization.
Origins and Innovation
Developed by Veer, a California-based belt drive manufacturer, Shift Drive is based on the company’s existing Split Belt. Unlike traditional belts, which are closed, preformed loops, the Split Belt starts out as a long strip that, following being installed along with the rest of the Veer drivetrain on the bike, is riveted at the ends forming a complete loop.
Key Advantages
The main advantage of this system is its ease of replacement. Unlike preformed belts, which require a removable section of the bike frame for installation, Veer’s Split Belt can be easily removed and replaced when worn. This represents a significant advance in terms of maintenance and ease of use.
In addition, traditional belt drives offer a single transmission ratio due to the impossibility of incorporating derailleurs. To vary speeds, it is necessary to add gearboxes to the hub or bottom bracket, which increases the weight, complexity and cost of the assembly.
How Shift Drive Works
Shift Drive overcomes these limitations through a rear sprocket that integrates several toothed elements, arranged side by side to form a ring. Each element can pivot 180 degrees independently, allowing you to alternate between two different tooth heights and, therefore, two different transmission ratios.
The change in ratio is achieved by making all the elements rotate sequentially in the same direction, thus changing the effective diameter of the pinion in contact with the belt. A spring-loaded clutch tensioner located below the sprocket automatically adjusts belt tension as needed.
The operation of the system, although complex in description, is clearly illustrated in a video available at the end of the original article, demonstrating the transition between two speeds in action.
Innovation and Compatibility
The gear change is initiated by an electronic microservo, but the effective movement is achieved thanks to the rotation of the hub. Shifts can be activated manually via a handlebar remote control or automatically via a pedal torque sensor.
Additionally, the Shift Drive system is compatible with any third-party geared hub that features a standard 9-spline freewheel body, potentially doubling the number of gears available. Veer plans to add more gears to the Shift Drive system in the future.
Future and Availability
Sean Hacking, founder of Veer, anticipates that the technology will begin to be implemented in production electric bicycles, and possibly other light electric vehicles, starting next summer (northern hemisphere). Interested business partners can contact him through the campaign on Start Engine or the company’s website.
More information: veercycle.com
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