Elevator suspension and/or driving arrangement
An elevator system includes an elevator car, one or more sheaves, and one or more belts operably connected to the car and interactive with the one or more sheaves for suspending and/or driving the elevator car. The one or more belts include a plurality of wires arranged into one or more cords, and a jacket substantially retaining the one or more cords. A cord ratio, between a smallest sheave diameter (D) of the one or more sheaves of the elevator system that are interactive with the belt and a largest cord diameter (d c ) of the one or more cords, (D/d c ) is less than about 55. A wire ratio, between the smallest sheave diameter (D) and the largest wire diameter (d w ) of the plurality of wires, (D/d w ) is between about 160 and about 315.
1. An elevator system comprising:
an elevator car;
one or more sheaves; and
one or more belts operably connected to the car and interactive with the one or more sheaves for suspending or driving the elevator car, a belt of the one or more belts comprising a plurality of wires arranged into a plurality of cords, the cords arrayed laterally across a width of the belt, and a jacket substantially retaining the one or more cords, wherein:
a cord ratio, between a smallest sheave diameter (D) of the one or more sheaves of the elevator system that are interactive with the belt and a largest cord diameter (dc) of the plurality of cords, (D/dc) is less than about 55; and
a wire ratio, between the smallest sheave diameter (D) and the largest wire diameter (dw) of the plurality of wires, (D/dw) is between 180 and 300.
2. The elevator system of claim 1 , wherein the cord ratio is between about 38 and about 55.
3. The elevator system of claim 2 , wherein the cord ratio is between about 40 and about 48.
4. The elevator system of claim 1 , wherein at least one of the one or more cords has less than about 49 wires.
5. The elevator system of claim 1 , wherein at least one of the one or more cords has between about 15 and about 38 wires.
6. The elevator system of claim 1 , wherein at least one of the one or more cords has between about 18 and about 32 wires.
7. The elevator system of claim 1 , wherein the plurality of wires in the one or more cords are arranged in a geometrically stable arrangement.
8. The elevator system of claim 1 , wherein the plurality of wires are formed of drawn steel.
9. The elevator system of claim 1 , wherein at least one wire of the plurality of wires has an ultimate tensile strength of between about 1800 and about 3300 mega Pascals.
10. The elevator system of claim 1 , wherein at least one wire of the plurality of wires has an ultimate tensile strength of between about 2200 and about 2700 mega Pascals.
11. The elevator system of claim 1 , wherein at least one of the one or more cords includes a king strand formed from a plurality of king wires significantly smaller than the other wires in the cord.
12. The elevator system of claim 11 , wherein the diameters of the wires of the king strand and the other wires in the cord can vary up to approximately +/−12% from a mean diameter.
13. The elevator system of claim 1 , wherein at least one of the one or more cords includes one or more king wires.
14. The elevator system of claim 13 , wherein the diameters of the king wires and the other wires in the cord can vary up to approximately +/−10% from a mean diameter.
15. A belt for suspending or driving an elevator car, comprising:
a plurality of wires arranged into a plurality of cords, the cords arrayed laterally across a width of the belt; and
a jacket substantially retaining the plurality of cords;
wherein a cord-to-wire ratio, between a largest cord diameter (dc) of a cord of the plurality of cords and the largest wire diameter (dw) of the plurality of wires, (dc/dw) is between about 4 and about 7.65; and
a wire ratio, between a smallest sheave diameter (D) and the largest wire diameter (dw) of the plurality of wires, (D/dw) is between 180 and 300.
16. The belt of claim 15 , wherein the cord-to wire ratio is between about 4.5 and about 6.25.
17. The belt of claim 16 , wherein the cord-to-wire ratio is between about 4.75 and about 5.5.
18. The belt of claim 15 , wherein at least one of the one or more cords comprises less than about 49 wires.
19. The belt of claim 15 , wherein at least one of the one or more cords comprises between about 15 and about 38 wires.
20. The belt of claim 15 , wherein at least one of the one or more cords comprises between about 18 and about 32 wires.
21. The belt of claim 15 , wherein at least one wire of the plurality of wires has an ultimate tensile strength of between about 1800 and about 3300 mega Pascals.
22. The belt of claim 15 , wherein at least one wire of the plurality of wires has an ultimate tensile strength of between about 2200 and about 2700 mega Pascals.
23. The belt of claim 15 , wherein the plurality of wires in the one or more cords are arranged in a geometrically stable arrangement.
24. The belt of claim 15 , wherein the plurality of wires are formed of drawn steel.
25. The belt of claim 15 , wherein at least one of the one or more cords includes a king strand formed from a plurality of king wires significantly smaller than the other wires in the cord.
26. The belt of claim 25 , wherein the diameters of the wires of the king strand and the other wires in the cord can vary up to approximately +/−12% from a mean diameter.
27. The belt of claim 15 , wherein at least one of the one or more cords includes one or more king wires.
28. The belt of claim 27 , wherein the diameters of the king wires and the other wires in the cord can vary up to approximately +/−10% from a mean diameter.
29. A belt for suspending or driving an elevator car, comprising:
a plurality of wires arranged into a plurality of cords, the plurality of cords arranged laterally across a width of the belt; and
a jacket substantially retaining the plurality of cords;
wherein:
the plurality of cords each include less than 49 wires;
a wire ratio, between a smallest sheave diameter (D) and the largest wire diameter (dw) of the plurality of wires, (D/dw) is between 180 and 300;
and
the plurality of wires:
have a wire diameter of less than about 0.68 millimeters; and
have an ultimate tensile strength of greater than about 1800 mega Pascals.
30. The belt of claim 29 , wherein a cord-to-wire ratio, between a largest cord diameter (dc) of the one or more cords and the largest wire diameter (dw) of the plurality of wires, (dc/dw) is between about 4 and about 7.65.
31. The belt of claim 30 , wherein the cord-to wire ratio (dc/dw) is between about 4.5 and about 6.25.
32. The belt of claim 31 , wherein the cord-to-wire ratio (dc/dw) is between about 4.75 and about 5.5.
33. The belt of claim 29 , wherein the plurality of wires is between about 15 and about 38 wires.
34. The belt of claim 29 , wherein the plurality of wires is between about 18 and about 32 wires.
35. The belt of claim 29 , wherein at least one of the plurality of wires has an ultimate tensile strength of between about 1800 to about 3300 mega Pascals.
36. The belt of claim 29 , wherein the ultimate tensile strength is between about 2200 and about 2700 mega Pascals.
37. The belt of claim 29 , wherein the plurality of wires in the one or more cords are arranged in a geometrically stable arrangement.
38. The belt of claim 29 , wherein the plurality of wires are formed of drawn steel.
39. The belt of claim 29 , wherein at least one of the one or more cords includes a king strand formed from a plurality of king wires significantly smaller than the other wires in the cord.
40. The belt of claim 39 , wherein the diameters of the wires of the king strand and the other wires in the cord can vary up to approximately +/−12% from a mean diameter.
41. The belt of claim 29 , wherein at least one of the one or more cords includes one or more king wires.
42. The elevator system of claim 41 , wherein the diameters of the king wires and the other wires in the cord can vary up to approximately +/−10% from a mean diameter.
43. A method of constructing one or more belts for suspending or driving a car or counterweight of an elevator system comprising:
determining a smallest sheave diameter (D) of one or more sheaves in the elevator system that interact with the one or more belts;
selecting a plurality of wires such that a wire ratio, between the smallest sheave diameter (D) and a largest wire diameter (dw) of the plurality of wires, (D/dw) is between 180 and 300;
arranging the plurality of wires into a plurality of cords such that a cord ratio, between the smallest sheave diameter (D) and a largest cord diameter (dc) of the one or more cords, (D/dc) is less than about 55;
arranging the plurality of cords laterally across a width of the belt; and
substantially retaining the plurality of cords with a jacket.
44. The method of claim 43 , wherein the wire arranging step uses less than about 49 wires per cord.
45. The method of claim 43 , wherein the wire arranging step uses between about 15 and about 38 wires per cord.
46. The method of claim 43 , wherein the wire arranging step uses between about 18 and about 32 wires per cord.
47. The method of claim 43 , wherein the wire selecting step produces a wire ratio (D/dw) of between about 180 and about 300.
48. The method of claim 43 , wherein the wire arranging step produces a cord ratio (D/dc) of between about 38 and about 55.
49. The method of claim 43 , wherein the wire arranging step produces a cord ratio (D/dc) of between about 40 and about 48.
50. The method of claim 43 , wherein the wire arranging step includes arranging the wires in a geometrically stable arrangement.
51. The method of claim 43 , wherein the wire selecting step includes using wires formed of drawn steel.
52. The method of claim 43 , wherein the wire arranging step includes using a king strand formed from a plurality of king wires significantly smaller than the other wires in the cord.
53. The method of claim 52 , wherein the wire selecting step includes selecting diameters of the king strand and the other wires in the cord that can vary up to approximately +/−12% from a mean diameter.
54. The method of claim 43 , wherein the wire arranging step includes using one or more king wires.
55. The method of claim 54 , wherein the wire selecting step includes selecting diameters of the king wires and the other wires in the cord that can vary up to approximately +/−10% from a mean diameter.