Rotary engine vane drive method and apparatus

1. An apparatus, comprising:

a rotary engine, said rotary engine comprising:

a rotor;

a housing; and

at least one vane configured to span a first distance between said rotor and said housing, said at least one vane comprising a first vane, said first vane comprising:

at least two roller elements; and

a stressed metal band wound around at least a portion of said at least two roller elements, said stressed metal band configured to apply a radially outward sealing force to said first vane toward said housing.

2. The apparatus of claim 1 , further comprising:

a first anchor point on said rotor, a first end of said stressed metal band attached to said first anchor point.

3. The apparatus of claim 2 , further comprising:

a second anchor point attached to a radially outward spooling roller of said at least two roller elements, a second end of said stressed metal band attached to said second anchor point.

4. The apparatus of claim 3 , said radially outward spooling roller further comprising:

a cam shape.

5. The apparatus of claim 3 , said rotary engine further comprising:

a first endplate; and

a second endplate, wherein each of said first endplate and said second endplate span a distance between said rotor and said housing, wherein said radially outward spooling roller rolls about an axis, the axis both perpendicular to said first endplate and perpendicular to said second endplate.

6. The apparatus of claim 3 , said at least one vane further comprising:

a first interior wall, a first portion of said stressed metal band positioned longitudinally in parallel to said first interior wall; and

a second interior wall parallel to said first interior wall, a second portion of said stressed metal band positioned longitudinally in parallel to said second interior wall, said at least two roller elements positioned between said first interior wall and said second interior wall.

7. The apparatus of claim 2 , said stressed metal band further comprising:

a band comprising a first face and a second face; and

a laminated surface coating said first face of said stressed metal band.

8. The apparatus of claim 2 , said stressed metal band comprising a shape memory alloy.

9. The apparatus of claim 1 , said stressed metal band comprising a spring steel belt.

10. The apparatus of claim 1 , said stressed metal band comprising at least one aperture therethrough.

11. The apparatus of claim 1 , said stressed metal band comprising more mass to a first side of a longitudinal center point of said stressed metal band relative to a lesser mass to a second side of said longitudinal center point.

12. The apparatus of claim 1 , said stressed metal band further comprising:

a non-rectangular perimeter shape when laid flat.

13. A method, comprising the steps of:

providing a rotary engine, said rotary engine comprising:

a rotor; and

a housing; and

spanning a first distance between said rotor and said housing with a vane, said vane comprising:

at least two roller elements; and

a stressed metal band wound around at least a portion of said at least two roller elements; and

said stressed metal band applying a radially outward force to said vane toward said housing.

14. The method of claim 13 , further comprising the steps of:

unspooling said stressed metal band on a spooling roller of said at least two roller elements during a power stroke phase of a rotation cycle of said rotary engine; and

spooling said stressed metal band from said spooling roller during an exhaust phase of the rotation cycle of said rotary engine.

15. The method of claim 14 , further comprising the steps of:

increasing potential energy of said stressed metal band during the exhaust phase; and

releasing potential energy of said stressed metal band during the power stroke phase.

16. The method of claim 15 , further comprising at least one of the steps of:

said stressed metal band applying a rotationally leading force against a rotationally leading interior guide wall of said vane; and

said stressed metal band applying a rotationally trailing force against a rotationally trailing interior guide wall of said vane.

17. The method of claim 16 , further comprising the step of:

said stressed metal band applying a radially outward force from a shaft of said rotary engine to said vane toward said housing at operational speeds of said rotary engine of less than thirty revolutions per minute.

18. The method of claim 14 , further comprising the steps of:

during said step of spooling, moving said stressed metal band along a first C-shaped path about a first shape change inducing roller of said at least two roller elements; and

during said step of spooling, moving said stressed metal band along a second C-shaped path about a second shape change inducing roller of said at least two roller elements.

19. The method of claim 18 , further comprising the steps of:

fabricating said stressed metal band in an extended shape; and

installing said stressed metal band in said at least one vane in a circuitous path between said at least two rollers,

wherein said stressed metal band comprises a shape memory alloy.

20. The method of claim 13 , further comprising the steps of:

spooling said stressed metal band on a spooling roller of said at least two roller elements during a power stroke phase of a rotation cycle of said rotary engine; and

unwinding said stressed metal band from said spooling roller during an exhaust phase of the rotation cycle of said rotary engine.

21. The method of claim 20 , further comprising the step of:

said step of spooling non-linearly extending said vane toward said housing during a power stroke phase of said rotary engine, where said spooling roller comprises a cam shape.

22. The method of claim 20 , said step of spooling further comprising the step of:

varying the radially outward force of said stressed metal band by varying cross-sectional areas of said stressed metal band wound onto said spooling roller as a function of rotation of said rotor.

23. The method of claim 13 , wherein said at least two roller elements comprises:

at least three rollers.

24. The method of claim 13 , wherein at least one of said at least two roller elements comprises a non-circular rolling perimeter.