Bicycle transmission system

An electromechanical transmission and wheel technology, used in bicycles, wheeled transmissions, motorcycles, etc.

Active Publication Date: 2014-03-19
NEXXTDRIVE LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0009] Although a variety of transmissions for EAPCs exist, including that described in WO-A1-2006 / 035215, the unpredictability of how a rider rides makes the control and operation of such devices problematic

Method used

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  • Bicycle transmission system
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Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0064] 【Structural layout】

[0065] figure 1 A powered assist cycle in the form of a bicycle 10 is shown. Bicycle 10 is similar to a conventional bicycle in that it has steer wheels 20 at the front and drive wheels 30 at the rear. Bicycle 10 also has a conventional arrangement of pedals 40 on crank arm 50 driving front toothed cogs 60 connected by chain 70 to rear sprocket 80 mounted coaxially with rear wheel 30 . However, bicycle 10 differs from conventional bicycles in that rear sprocket 80 is not fixedly mounted to hub 100 of rear wheel 30 to directly drive the rear wheel, but rather rear sprocket 80 drives certain components of an electromechanical transmission housed within hub 100 .

[0066] figure 2The hub 100 and its contents are shown in detail. A first electric machine in the form of a first radial flux motor generator 110 , a second electric machine in the form of a second radial flux motor generator 120 , a first planetary gear set 130 and a second planetary ...

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PUM

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Abstract

A method is provided for controlling operation of a pedal cycle (10) having a rear hub-mounted electro-mechanical transmission arrangement in which a chain-driven rear sprocket (80), an input electrical machine (120) and the hub (100) are each coupled to a respective branch of a three-branch epicyclic gear set (140). Allowing for natural variations in input torque by a cyclist over a cycle of the crank arms (50), a substantially constant current is caused to exist in the input electrical machine (120) such that a change in torque applied by the cyclist results in a change in transmission ratio between the rear sprocket (80) and the hub (100), thereby providing a form of automatic and continuously variable transmission for the pedal cycle (10).

Description

technical field [0001] The invention relates to a method of operating a cycle having an electromechanical transmission. Background technique [0002] Various forms of bicycles exist. A traditional form of bicycle that is propelled only by the rider applying force to its pedals is sometimes referred to as a "push bike." Another newer form of bicycle is the Electrically-Assisted Pedal Cycle (EAPC), which uses electricity to assist the rider in riding the bicycle. Both traditional bicycles and EAPCs have two, three or four wheels, sometimes even more. In this document, the term "cycle" includes conventional cycle and EAPC. [0003] As described above, in the EAPC, electric power is used to assist the rider to ride the bicycle. Accordingly, the EAPC comprises means for storing electrical energy, such as a battery, and an electric motor arranged to drive or at least assist in driving the cycle. Batteries can usually be recharged by plugging them into a power source, such as ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B62M6/65B62M11/14B62M6/45
CPCB62M6/55B62M11/145B62M6/65B62M6/45B62M11/14B60L2200/12B60L2220/42B60L2240/421B60L2240/486H02K7/116B60L50/20Y02T10/64
Inventor F·H·莫勒M·韦伯
Owner NEXXTDRIVE LTD
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