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The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.

The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.

Patent No.:

US 10408223 B1

PDFFull Text
Date of Patent:
Sep. 10, 2019

Filed:

Jun. 07, 2017

Low hub-to-tip ratio fan for a turbofan gas turbine engine

Applicant:

Pratt & Whitney Canada Corp., Longueuil, CA;

Inventors:

Kari Heikurinen, Mississauga, CA;

Peter Townsend, Mississauga, CA;

Assignee:

PRATT & WHITNEY CANADA CORP., Longueuil, CA;

Attorney:

Norton Rose Fulbright Canada LLP

Primary Examiner:

Igor Kershteyn

Int. Cl.
CPC ...
F01D 5/30 (2006.01); B23K 20/12 (2006.01); F01D 5/14 (2006.01); F01D 5/34 (2006.01); F02K 3/06 (2006.01); F04D 29/02 (2006.01); F04D 29/32 (2006.01); F04D 29/64 (2006.01); F04D 29/38 (2006.01); F04D 29/34 (2006.01); B23K 101/00 (2006.01);
U.S. Cl.
CPC ...
F04D 29/384 (2013.01); B23K 20/129 (2013.01); F01D 5/14 (2013.01); F01D 5/3061 (2013.01); F01D 5/34 (2013.01); F02K 3/06 (2013.01); F04D 29/023 (2013.01); F04D 29/321 (2013.01); F04D 29/324 (2013.01); F04D 29/329 (2013.01); F04D 29/34 (2013.01); F04D 29/388 (2013.01); F04D 29/644 (2013.01); B23K 2101/001 (2018.08); F05D 2230/239 (2013.01); F05D 2260/40 (2013.01); Y10T 29/49245 (2015.01);
Abstract

A fan for a turbofan gas turbine engine having a low hub-to-tip ratio is disclosed. The fan includes a rotor hub and a plurality of radially extending fan blades. Each fan blade defines a hub radius (R), which is the radius of the leading edge at the hub relative to a centerline of the fan, and a tip radius (R), which is the radius of the leading edge at a tip of the fan blade relative to the centerline of the fan. The ratio of the hub radius to the tip radius (R/R) is less than 0.29. In a particular embodiment, this ratio is between 0.25 and 0.29. In another particular embodiment, this ratio is less than 0.25.

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