Shape memory alloy heat engines and energy harvesting systems
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United States of America Patent
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Sep 30, 2014
Grant Date -
Aug 30, 2012
app pub date -
Dec 30, 2011
filing date -
Feb 28, 2011
priority date (Note) -
In Force
status (Latency Note)
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Abstract
A heat engine includes a first rotatable pulley and a second rotatable pulley spaced from the first rotatable pulley. A shape memory alloy (SMA) element is disposed about respective portions of the pulleys at an SMA pulley ratio. The SMA element includes a first wire, a second wire, and a matrix joining the first wire and the second wire. The first wire and the second wire are in contact with the pulleys, but the matrix is not in contact with the pulleys. A timing cable is disposed about respective portions of the pulleys at a timing pulley ratio, which is different than the SMA pulley ratio. The SMA element converts a thermal energy gradient between the hot region and the cold region into mechanical energy.
First Claim
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International Classification(s)
- F01B:MACHINES OR ENGINES, IN GENERAL OR OF POSITIVE-DIS....
- C22F:CHANGING THE PHYSICAL STRUCTURE OF NON-FERROUS MET....
- F16G:BELTS, CABLES, OR ROPES, PREDOMINANTLY USED FOR DR....
- F03G:SPRING, WEIGHT, INERTIA, OR LIKE MOTORS; MECHANICA....
- F02G:HOT-GAS OR COMBUSTION- PRODUCT POSITIVE-DISPLaCEME....
- C22C:ALLOYS
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