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A gear assembly comprises a housing, a first gear shaft in the housing, a first spiral gear coupled to the first gear shaft in the housing, a second gear shaft in the housing, a second spiral gear coupled to the second gear shaft in the housing, and a fluid connection between a first chamber and a s

A gear assembly comprises a housing, a first gear shaft in the housing, a first spiral gear coupled to the first gear shaft in the housing, a second gear shaft in the housing, a second spiral gear coupled to the second gear shaft in the housing, and a fluid connection between a first chamber and a second chamber. The first spiral gear and the second spiral gear couple to define the first chamber and the second chamber within the housing.

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1. A door closer, for closing a door, comprising: a housing,a first gear shaft, in the housing,a first spiral gear coupled to the first gear shaft, in the housing,a second gear shaft, in the housing,a second spiral gear coupled to the second gear shaft, in the housing,a fluid connection between a fi

1. A door closer, for closing a door, comprising: a housing,a first gear shaft, in the housing,a first spiral gear coupled to the first gear shaft, in the housing,a second gear shaft, in the housing,a second spiral gear coupled to the second gear shaft, in the housing,a fluid connection between a first chamber and a second chamber, anda torsion spring, coupled to the second spiral gear shaft,wherein the first spiral gear and the second spiral gear are coupled to define the first chamber and the second chamber within the housing. 2. The door closer of claim 1, further comprising a first bearing, coupled to the first gear shaft, and a second bearing, coupled to the second gear shaft, wherein the first and second spiral gears are substantially identical,the first spiral gear includes a first gear valve,the second spiral gear includes a second gear valve,the first spiral gear and the first gear shaft form a first monolithic component, andthe second spiral gear and the second gear shaft form a second monolithic component. 3. The door closer of claim 1, wherein the first and second spiral gears are substantially identical. 4. The door closer of claim 1, further comprising a fluid connection valve along the fluid connection. 5. The door closer of claim 1, further comprising a first bearing, coupled to the first gear shaft, and a second bearing, coupled to the second gear shaft. 6. The door closer of claim 1, wherein the first spiral gear and the first gear shaft form a first monolithic component, and the second spiral gear and the second gear shaft form a second monolithic component. 7. The door closer of claim 1, wherein the first spiral gear includes a first gear valve comprising a ball, and the second spiral gear includes a second gear valve comprising a ball and a spring. 8. A door assembly, comprising: a door, andthe door operator of claim 1,wherein the door is coupled to the first spiral gear. 9. The door assembly of claim 8, wherein the door closer is located within the door. 10. A door assembly, comprising: a door, anda door operator, comprising a housing,a first gear shaft, in the housing,a first spiral gear coupled to the first gear shaft, in the housing,a second gear shaft, in the housing,a second spiral gear coupled to the second gear shaft, in the housing,a fluid connection between a first chamber and a second chamber, anda hydraulic pump, in fluid connection with the first chamber and the second chamber,wherein the first spiral gear and the second spiral gear are coupled to define the first chamber and the second chamber within the housing, andthe door is coupled to the first spiral gear. 11. The door assembly of claim 10, wherein the door operator further comprises an output shaft, coupled to the door and either the first gear shaft or the second gear shaft. 12. The door assembly of claim 10, wherein the door operator further comprises a first bearing, coupled to the first gear shaft, and a second bearing, coupled to the second gear shaft, wherein the first and second spiral gears are substantially identical,the first spiral gear includes a first gear valve,the second spiral gear includes a second gear valve,the first spiral gear and the first gear shaft form a first monolithic component, andthe second spiral gear and the second gear shaft form a second monolithic component. 13. The door assembly of claim 10, wherein the door operator is located within the door. 14. The door assembly of claim 10, wherein the first and second spiral gears are substantially identical. 15. The door assembly of claim 10, wherein the door operator further comprises a fluid connection valve along the fluid connection. 16. The door assembly of claim 10, wherein the door operator further comprises a first bearing, coupled to the first gear shaft, and a second bearing, coupled to the second gear shaft. 17. The door assembly of claim 10, wherein the first spiral gear and the first gear shaft form a first monolithic component, and the second spiral gear and the second gear shaft form a second monolithic component. 18. A door assembly, comprising: a door, anda door operator, comprising a first gear shaft,a first spiral gear, coupled to the first gear shaft,a second gear shaft,a second spiral gear, coupled to the second gear shaft, andan electric motor, coupled to the first gear shaft,wherein the first spiral gear is coupled to the second spiral gear, andthe door is coupled to the first spiral gear. 19. The door assembly of claim 18, wherein the first and second spiral gears are substantially identical. 20. The door assembly of claim 18, wherein the door operator further comprises a first bearing, coupled to the first gear shaft, and a second bearing, coupled to the second gear shaft. 21. The door assembly of claim 18, wherein the door operator further comprises an output shaft, coupled to the door and the first gear shaft. 22. The door assembly of claim 18, wherein the first spiral gear and the first gear shaft form a first monolithic component, and the second spiral gear and the second gear shaft form a second monolithic component. 23. The door assembly of claim 18, wherein the door operator further comprises a first bearing, coupled to the first gear shaft, and a second bearing, coupled to the second gear shaft, the first and second spiral gears are substantially identical,the first spiral gear and the first gear shaft form a first monolithic component, andthe second spiral gear and the second gear shaft form a second monolithic component. 24. The door assembly of claim 18, wherein the door operator is located within the door.