Drive means and chain drive with polygonal compensation
Drive means for the polygonally-compensated drive of a sprocket, comprising two pulling means wheels ( 1, 2 ), a pulling means ( 3 ) running on them with an top span ( 31 ) and a bottom span ( 32 ), and a tensioning means acting on the pulling means ( 3 ), wherein the tensioning means comprises a first non-circular compensation wheel ( 4 ), which can come into contact with the top span ( 31 ), a second non-circular compensation wheel ( 5 ), which can come into contact with the bottom span ( 32 ), a rocker ( 6 ) adapted for rotatably receiving the first compensation wheel ( 4 ) and the second compensation wheel ( 5 ), wherein the rocker ( 6 ) is pivotably supported on a fixed bearing. The invention also relates to a chain drive, comprising at least a sprocket ( 7 ), a drive means, wherein the sprocket ( 7 ) is driven by the drive means, wherein the drive means is a drive means according to at least one of the claims 1 to 17.
1. A chain drive comprising:
a sprocket;
a drive for driving said sprocket;
a further sprocket;
a conveyor chain wrapped around said sprocket and said further sprocket, said conveyor chain being provided with a plurality of attachment parts, said attachment parts being escalator steps or pallets;
said drive being configured for a polygonally-compensated driving of said sprocket, said drive including:
two pulley wheels;
a pulling device running on said two pulley wheels with an upper run and a lower run; and
a tensioning device disposed to act on said pulling device, said tensioning device including:
a first non-circular compensation wheel disposed to come into contact with said upper run;
a second non-circular compensation wheel disposed to come into contact with said lower run;
a rocker rotatably supporting said first compensation wheel and said second compensation wheel; and
a fixed bearing pivotally supporting said rocker.
2. The chain drive according to claim 1 , wherein said compensation wheels include a rotary axis and a running surface for said pulling device, wherein at least a first radius is defined between the rotary axis and the running surface and a second radius is defined between the rotary axis and the running surface, and the first radius is different from the second radius.
3. The chain drive according to claim 1 , wherein said compensation wheels have at least one running surface section, wherein at least a first radius is defined between the rotary axis and the running surface section and a second radius is defined between the rotary axis and the running surface section, and wherein the first radius is different from the second radius.
4. The chain drive according to claim 3 , wherein said running surface section is one of four running surface sections.
5. The chain drive according to claim 4 , wherein said running surface sections have a convex configuration.
6. The chain drive according to claim 1 , wherein said compensation wheels are toothed wheels and wherein a running surface or a running surface section for said pulling device corresponds to a pitch circle of said toothed wheel.
7. The chain drive according to claim 1 , wherein said first compensation wheel and said second compensation wheel are substantially identical wheels.
8. The chain drive according to claim 1 , wherein said rocker has a first lever arm and a second lever arm, said first compensation wheel is rotatably mounted to an end of said first lever arm and said second compensation wheel is rotatably mounted to an end of said second lever arm, and said bearing for pivotally mounting said rocker is disposed between said lever arms.
9. The chain drive according to claim 1 , wherein said bearing comprises a pin and a bore formed in said rocker.
10. The chain drive according to claim 9 , wherein said pin is disposed on a geometrical axis extending between said rotary axes of said first pulley wheel and said second pulley wheel.
11. The chain drive according to claim 9 , wherein said rocker is formed with at least one further bore, and wherein said further bore together with said pin defines an alternative position of said bearing.
12. The chain drive according to claim 11 , wherein further possible bores for pivotally receiving the rocker on said pin can be provided on a center axis extending through center points of said further bore and said bore.
13. The chain drive according to claim 9 , which comprises a pressed-in sliding bearing of metal or polymeric material between said pin and said rocker.
14. The chain drive according to claim 1 , wherein said rocker is pivotable on said bearing about a pivoting angle, wherein said bearing, said rocker, said compensation wheels, and said pulling device are configured such that, when said rocker is pivoted about said pivoting angle, a rotation of said compensation wheels about an angle of rotation arises.
15. The chain drive according to claim 1 , wherein said rocker includes a pivoting angle limiter.
16. The chain drive according to claim 15 , wherein said pivoting angle limiter is an elongate hole formed in said rocker and including a fixed stop.
17. The chain drive according to claim 1 , wherein a pivoting motion of said rocker is triggered by a reversal of a direction of rotation and/or a reversal of a torque of said pulley wheels.
18. The chain drive according to claim 1 , wherein said pulling device is a form-closed pulling device.
19. The chain drive according to claim 18 , wherein said pulling device is a chain.
20. The chain drive according to claim 18 , wherein said pulling device is a roller chain.
21. The chain drive according to claim 1 , wherein an angle of rotation of said compensation wheels corresponds to half a pitch angle of said sprocket, multiplied by a number of teeth of said pulley wheel coupled with said sprocket, divided by a number of teeth of said compensation wheels.
22. A drive assembly comprising:
a sprocket;
a drive for driving said sprocket;
said drive being configured for a polygonally-compensated driving of said sprocket, said drive including:
two pulley wheels;
a pulling device running on said two pulley wheels with an upper run and a lower run; and
a tensioning device disposed to act on said pulling device, said tensioning device including:
a first non-circular compensation wheel disposed to come into contact with said upper run;
a second non-circular compensation wheel disposed to come into contact with said lower run;
a rocker rotatably supporting said first compensation wheel and said second compensation wheel; and
a fixed bearing pivotally supporting said rocker.