Circular arc multi-bore fan disk

A gas turbine engine rotor disk comprising:

• a number of annular hubs circumscribed about a centerline,
• each of said hubs connected to a disk rim by a web,
• a plurality of circumferentially spaced apart circular arc dovetail slots disposed through said rim, extending circumferentially between disk posts, extending axially from a forward end to an aft end of said rim, and extending radially inwardly from a disk outer surface of said rim,
• an axially forwardly extending overhang located radially outwardly on each of said disk posts,
• circumferentially extending annular burst slots extending radially through said rim into said dovetail slots between each adjacent pair of said webs,
• each of said burst slots having a cross-section in a shape of an ogive with a radially outer ogive radius and a radially inner ogive radius and said radially inner ogive radius is substantially larger than said radially outer ogive radius, and
• an annular forward extension having an annular forward flange and connected to an annular forward arm extending forwardly from a forward most one of said webs.

A gas turbine engine rotor disk comprising:

• a number of annular hubs circumscribed about a centerline,
• each of said hubs connected to a disk rim by a web,
• a plurality of circumferentially spaced apart circular arc dovetail slots disposed through said rim, extending circumferentially between disk posts, extending axially from a forward end to an aft end of said rim, and extending radially inwardly from a disk outer surface of said rim,
• circumferentially extending annular burst slots extending radially through said rim into said dovetail slots between each adjacent pair of said webs,
• each of said burst slots having a cross-section in a shape of an ogive with a radially outer ogive radius and a radially inner ogive radius and said radially inner ogive radius is substantially larger than said radially outer ogive radius,
• an annular forward extension having an annular forward flange,
• said annular forward extension connected to an annular forward arm extending forwardly from a forward most one of said webs, and
• an aft extension flange bolted to said annular forward arm.

A gas turbine engine rotor disk comprising:

• a number of annular hubs circumscribed about a centerline,
• each of said hubs connected to a disk rim by a web,
• a plurality of circumferentially spaced apart circular arc dovetail slots disposed through said rim, extending circumferentially between disk posts, extending axially from a forward end to an aft end of said rim, and extending radially inwardly from a disk outer surface of said rim,
• circumferentially extending annular burst slots extending radially through said rim into said dovetail slots between each adjacent pair of said webs,
• each of said burst slots having a cross-section in a shape of an ogive with a radially outer ogive radius and a radially inner ogive radius and said radially inner ogive radius is substantially larger than said radially outer ogive radius,
• an axially forwardly extending overhang located radially outwardly on each of said disk posts, and
• forward and aft disk lugs extend radially outwardly from said posts along said disk outer surface of said rim.

A gas turbine engine rotor disk comprising:

• a number of annular hubs circumscribed about a centerline,
• each of said hubs connected to a disk rim by a web,
• a plurality of circumferentially spaced apart circular arc dovetail slots disposed through said rim, extending circumferentially between disk posts, extending axially from a forward end to an aft end of said rim, and extending radially inwardly from said disk outer surface of said rim,
• circumferentially extending annular burst slots extending radially through said rim into said dovetail slots between each adjacent pair of said webs,
• an axially forwardly extending overhang located radially outwardly on each of said disk posts,
• forward and aft disk lugs extend radially outwardly from said posts along a disk outer surface of said rim,
• a chamfer on a radially outer corner of said each of said disk posts on a portion of said overhangs,
• a plurality of post holes extending axially aftwardly into said rim wherein each of said post holes extends axially aftwardly into a corresponding one of said disk posts, undercuts formed below dovetail slot pressure planes on said posts along said circular arc dovetail slots, and
• an annular forward extension having an annular forward flange and connected to an annular forward arm extending forwardly from a forward most one of said webs wherein said annular forward extension is integrally cast with said annular forward arm.