Engine mount system for a turbofan gas turbine engine
A mount system for a gas turbine engine includes an aft mount which reacts at least a portion of a thrust load at an engine case generally parallel to an engine axis.
1. A mount system for a gas turbine engine comprising:
an aft mount which reacts at least a portion of a thrust load at an engine case generally parallel to an engine axis, wherein said aft mount comprises:
a rear mount platform;
a waffle tree assembly;
a first A-arm mounted to said rear mount platform through a first ball joint and said waffle tree assembly through a first sliding ball joint; and
a second A-arm mounted to said rear mount platform through a second ball joint and said waffle tree assembly through a second sliding ball joint.
2. The system as recited in claim 1 , wherein said aft mount is attachable to a mid-turbine frame contained at least partially within said engine case.
3. The mount system as recited in claim 2 , wherein said aft mount is attachable to said mid turbine frame through said engine case defined about said engine axis.
4. The mount system as recited in claim 2 , wherein said mid turbine frame supports at least one bearing.
5. The mount system as recited in claim 1 , further comprising a forward mount forward of said aft mount along said engine axis, said forward mount reacts at least a vertical load.
6. The mount system as recited in claim 5 , wherein said forward mount is attachable to an engine intermediate case.
7. The mount system as recited in claim 5 , wherein said forward mount reacts a side load.
8. The mount system as recited in claim 1 , wherein said first A-arm and said second A-arm each comprise a rigid generally triangular arrangement.
9. The mount system as recited in claim 1 , further comprising a drag link mounted to said rear mount platform through a third ball joint.
10. A mount system for a gas turbine engine comprising:
a pylon;
an engine case defined about an engine axis of rotation;
a rear mount platform attached to said pylon;
a wiffle tree assembly mounted to said pylon through a first wiffle tree ball link;
a first A-arm mounted to said rear mount platform through a first A-arm first ball joint, said wiffle tree assembly though a first A-arm sliding ball joint and said engine case through a first A-arm second ball joint; and
a second A-arm mounted to said rear mount platform through a second A-arm first ball joint, said wiffle tree assembly though a second A-arm sliding ball joint and said engine case through a second A-arm second ball joint.
11. The mount system as recited in claim 10 , wherein said first A-arm and said second A-arm each comprise a rigid generally triangular arrangement.
12. The mount system as recited in claim 10 , further comprising a drag link mounted to said rear mount platform through a first drag link ball joint and to said engine case through a second drag link ball joint.
13. The mount system as recited in claim 10 , wherein said engine case comprises a thrust case.
14. The mount system as recited in claim 13 , wherein said engine case supports a mid-turbine frame.
15. The mount system as recited in claim 10 , wherein said engine case is located generally around and axially between a high pressure turbine and a low pressure turbine.
16. A method for mounting a gas turbine engine comprising an engine case which at least partially surrounds a turbine section, and a pylon, comprising:
positioning a rear mount platform of an aft mount between the engine case and the pylon to react a least a vertical load, a side load and a thrust load;
connecting a first and second A-arm of the aft mount between the rear mount platform and the engine case through a respective ball joint to react a thrust vector of the thrust load at the engine case generally parallel to an engine axis; and
connecting a wiffle tree assembly between the first and second A-arm and the pylon through though a respective sliding ball joint to react only a vertical load transverse to the engine axis.
17. A method as recited in claim 16 , further comprising:
connecting a drag link between the engine case an the rear mount platform to react a torque load.
18. A method as recited in claim 16 , further comprising:
locating the engine case generally around and axially between a high pressure turbine and a low pressure turbine.