Coupling for rotor balancing
Systems, devices and methods according to these exemplary embodiments provide couplings or interfaces usable, for example, in the high speed balance testing of rotors are provided. A coupling includes a main body portion having an extended thin portion therein which is configured to fit a shaft of the balancing machine and an extended insert portion which is configured to fit an opening in the rotor. A plurality of connection elements is disposed in holes in the main body portion of the coupling and a ring is disposed over the extended insert and proximate exits of the holes in the main body portion.
1. A coupling for connecting a rotor to a balancing test machine, the coupling comprising:
a main body portion having, an extended thin portion therein which is configured to fit a shaft of the balancing test machine and an extended insert portion which is configured to fit an opening in the rotor;
a plurality of connection elements disposed in holes in the main body portion; and
a ring disposed over the extended insert portion between the main body portion and an end of the rotor, wherein the plurality of connection elements operate to push the ring outwardly toward an end of the extended insert portion to create a friction fit between the coupling and the rotor to transmit torque from the balancing test machine through the coupling and to the rotor;
wherein the coupling rigid.
2. The coupling of claim 1 , wherein each of the plurality of connection elements is disposed in a recessed hole in the main body portion.
3. The coupling of claim 1 , wherein the connection elements are screws.
4. The coupling of claim 3 , wherein the holes for the screws are disposed symmetrically about a circumference of the main body portion.
5. The coupling of claim 1 , wherein the main body portion and the ring are formed as cylinders having a substantially same diameter and the extended insert portion is a cylinder having a smaller diameter than that of the main body portion and the ring.
6. A method for connecting a rotor to a balance testing machine, the method comprising:
inserting an extended insert portion of a coupling device into an opening in the rotor:
applying a torque to a plurality of connection elements, which plurality of connection elements are disposed in a main body portion of the coupling device, to force a ring disposed over the extended insert portion between the main body portion and an end of the rotor; and
connecting a drive shaft of the balance testing machine to an extended thin portion in the main body portion of the coupling device using the plurality of connection elements to push the ring outwardly toward an end of the extended insert portion to create a friction fit between the coupling and the rotor to transmit torque from the balance testing machine through the coupling and to the rotor,
wherein the coupling is rigid.
7. The method of claim 6 , wherein each of the plurality of connection elements is disposed in a recessed hole in the main body portion.
8. The method of claim 6 , wherein the main body portion and the ring are formed as cylinders having a substantially same diameter and the extended insert portion is a cylinder having a smaller diameter than that of the main body portion and the ring.
9. A balance testing system comprising:
a balance test machine including a drive shaft;
a coupling, connected on one side to the drive shaft; and
a rotor, connected to receive torque from the drive shaft through the coupling,
the coupling comprising:
a main body portion having an extended thin portion therein which is configured to fit the drive shaft of the balance test machine and an extended insert portion which is configured to lit an opening in the rotor;
a plurality of connection elements disposed in holes in the main body portion; and
a ring disposed over the extended insert portion between the main body portion and an end of the rotor, wherein the plurality of connection elements operate to push the ring outwardly toward an end of the extended insert portion to create a friction fit between the coupling and the rotor to transmit torque from the balance testing machine through the coupling and to the rotor;
wherein the coupling is rigid.
10. The balance testing system of claim 9 , wherein the connection elements are operable to push the ring outwardly toward an end of the extended insert portion.
11. The balance testing system of claim 9 , wherein each of the plurality of connection elements is disposed in a recessed hole in the main body portion.
12. The balance testing system of claim 9 , wherein the connection elements are screws.
13. The balance testing system of claim 12 , wherein the holes for the screws are disposed symmetrically about a circumference of the main body portion.
14. The balance testing system of claim 9 , wherein the main body portion and the ring are formed as cylinders haying a substantially same diameter and the extended insert portion is a cylinder having a smaller diameter than that of the main body portion and the ring.