Turbine airfoil platform extension for low buttress stress

(19)

(11)

EP 1 749 970 A3

(12)	EUROPEAN PATENT APPLICATION

(88)	Date of publication A3:
	26.05.2010 Bulletin 2010/21

(43)	Date of publication A2:
	07.02.2007 Bulletin 2007/06

(21)	Application number: 06252876.5

(22)	Date of filing: 02.06.2006

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International Patent Classification (IPC):

F01D 5/14^(2006.01)

F01D 5/30^(2006.01)

(84)	Designated Contracting States:
	AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HU IE IS IT LI LT LU LV MC NL PL PT RO SE SI SK TR
	Designated Extension States:
	AL BA HR MK YU

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Priority:

03.08.2005 US 197162

(71)	Applicant: United Technologies Corporation
	Hartford, CT 06101 (US)

(72)	Inventors:
	Dube, Bryan P. Columbia CT 06237 (US) Butcher, Randall J. Newington CT 06111 (US)

(74)	Representative: Leckey, David Herbert
	Dehns St Bride's House 10 Salisbury Square London EC4Y 8JD London EC4Y 8JD (GB)

(54)	Turbine airfoil platform extension for low buttress stress

(57) A blade (100) is provided for use in a gas turbine engine. The blade (100) has a platform (102), an airfoil portion (104) extending radially from a first side (106) of the platform (102), and an attachment portion (108) extending from a second or underside side (110) of the platform (102). The attachment portion (108) includes a buttress (116) which abuts the second side (110) of the platform (102). The blade is provided with additional material (140) on the second side (110) of the platform (102) for redistributing load away from the buttress (116).

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