Rotary spring energy storage
The goal was to design a lightweight system, for bicycles, that can level the input energy requirement (human exertion) in accordance with variations in road load (friction, wind, and grade) and/or to provide a system for regenerative braking, that is, to store energy normally lost in brake pad friction for brief periods until it required for re-acceleration or hill-climbing. The rotary spring, also called the coil, motor, spiral, or power spring is governed by the equations reviewed. Materials used in spring manufacture are briefly discussed, and justification for steel as the design choice of material is given. Torque and power requirements for a bicycle and rider are provided as well as estimated human power output levels. These criteria are examined to define spring size and possible orientations on a bicycle. Patents and designs for coupling the spring to the drive train are discussed.
- Research Organization:
- Cooley (Stuart), Bethesda, MD (USA)
- DOE Contract Number:
- FG43-79R306055
- OSTI ID:
- 5631607
- Report Number(s):
- DOE/R3/06055-T1; ON: DE85010173
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
ENERGY STORAGE
SPRINGS
BICYCLES
DESIGN
MATHEMATICAL MODELS
POWER
REGENERATIVE BRAKING
STAINLESS STEEL-18-8
TORQUE
ALLOYS
CHROMIUM ALLOYS
CHROMIUM STEELS
CHROMIUM-NICKEL STEELS
CORROSION RESISTANT ALLOYS
IRON ALLOYS
IRON BASE ALLOYS
MACHINE PARTS
NICKEL ALLOYS
STAINLESS STEELS
STEELS
STORAGE
VEHICLES
250000* - Energy Storage