Turbine rotor cover plate lock

Patent metadata

Field	Value
Publication number	US-9249676-B2
Application number	US-201213488844-A
Country	US
Kind code	B2
Filing date	Jun 5, 2012
Priority date	Jun 5, 2012
Publication date	Feb 2, 2016
Grant date	Feb 2, 2016

Abstract

A rotor assembly for a gas turbine engine includes a rotor configured for rotation about an engine axis, the rotor including an aft surface including a rotor slot and a cover plate attached to the aft surface of the rotor, the cover plate including a tab received within the rotor slot and a cover plate slot aligned with the rotor slot. A lock assembly disposed within the rotor slot holds a position of the cover plate relative to the rotor. The lock assembly includes a key portion conforming to the rotor slot, a lock portion engageable with a surface of the rotor slot and a threaded member for holding the lock assembly within the rotor slot.

First claim

The invention claimed is:

1. A rotor assembly for a gas turbine engine comprising:
a rotor configured for rotation about an engine axis, the rotor including an aft surface including a rotor slot;
a cover plate attached to the aft surface of the rotor, the cover plate including a tab received within the rotor slot and a cover plate slot aligned with the rotor slot; and
a lock assembly disposed within the rotor slot for holding a position of the cover plate relative to the rotor, the lock assembly including a key portion conforming to the rotor slot, a lock portion engageable with a surface of the rotor slot and a threaded member.

2. The rotor assembly as recited in claim 1 , wherein the rotor includes an aft wall defining the rotor slot and an annular channel forward of the aft wall, wherein the tab is received through the rotor slot and rotated circumferentially within the annular channel to align the rotor slot and the cover slot.

3. The rotor assembly as recited in claim 2 , wherein the lock portion includes a barrel disposed about a central axis and a flange extending from the barrel, the barrel including threads configured to receive the threaded member.

4. The rotor assembly as recited in claim 3 , wherein the flange extends parallel to the central axis.

5. The rotor assembly as recited in claim 4 , wherein the flange engages an inner surface of the annular channel of the rotor to hold the locking assembly within the rotor slot.

6. The rotor assembly as recited in claim 2 , wherein the key includes a lip contacting the aft surface of the cover plate.

7. The rotor assembly as recited in claim 6 , wherein the flange of the lock is engageable to a portion of the key to prevent relative rotation therebetween.

8. The rotor assembly as recited in claim 6 , wherein the key includes a window for viewing a position of the lock when assembled to the rotor slot.

9. The rotor assembly as recited in claim 1 , wherein the lock portion is movable relative to the key portion.

10. The rotor assembly as recited in claim 9 , wherein the lock portion is movable between a first position enabling insertion of the key and lock into rotor slot and a second position enabling securement of the lock portion against a portion of the rotor.

11. A lock assembly for preventing movement between assembled structures of a turbine engine, the lock assembly comprising: a key including a lip configured to engage an outside surface of a cover plate of the assembled structures; a lock including a flange configured to engage an inner surface of a rotor disk of the assembled structures, wherein the lock is movable relative to the key between a first position enabling insertion of the key into an opening within the cover plate of the assembled structures and a second position enabling engagement of the lock to the rotor disk of the assembled structures; and a fastening member configured to hold the lock and key in a fastened position.

12. The lock assembly as recited in claim 11 , wherein the lock comprises a barrel with an internal bore including threads corresponding to threads on the fastening member and a flange extending transverse to the bore.

13. The lock assembly as recited in claim 12 , wherein the lock engages a portion of the key for controlling a position of the lock relative to the key.

14. The lock assembly as recited in claim 11 , including a window.

15. The lock assembly as recited in claim 11 , wherein the lip of the key defines a first contact surface and the flange defines a second contact surface spaced a distance from each other in a direction transverse to an axis of rotation of the fastening member.

16. A method of assembling a cover plate to a turbine rotor comprising:
inserting a tab of a cover plate through a rotor slot;
rotating the cover plate to align a cover plate slot with the rotor slot;
setting a locking assembly into an assembly orientation;
inserting the locking assembly into the rotor slot to contact a key with an outer surface of one of cover plate;
moving a lock of the locking assembly to a lock position; and
tightening a fastener to engage the lock of the locking assembly within the rotor slot including tightening the fastener to engage the lock with an inner surface of the rotor and a lip of the key with the cover plate.

17. The method as recited in claim 16 , including holding the assembly orientation of the lock relative to the key by contacting a portion of the lock with the key.

18. The method as recited in claim 16 , including viewing a position of the lock through a window of the key for visually confirming a desired locking orientation of the lock.

Assignees

• Antonellis Stephen M
• Heydrich Frank
• United Technologies Corp

Inventors

• Antonellis Stephen M
• Heydrich Frank

Classifications

• F05D2250/182

  crenellated, notched · CPC title

• F05D2230/64

  using positioning or alignment devices for aligning or centring, e.g. pins · CPC title

• F01D5/3015

  with side plates · CPC title

• F01D5/326 Primary

  Locking of axial insertion type blades by other means · CPC title

• F01D11/006

  Sealing the gap between rotor blades or blades and rotor · CPC title