Composite fan blade dovetail root
AssigneeUnited Technologies Corporation
InventorsCarl Brian Klinetob, Brian P. Huth, Gregory E. Reinhardt
Life of this patent
Estimating the term…
Abstract
A composite fan blade having an airfoil with a leading edge and a trailing edge and a dovetail root includes a first pressure face and second pressure face, a lower horizontal face connecting the pressure faces at the bottom of the dovetail and a first and a second dovetail runout fillet connecting the pressure faces to the airfoil. The pressure faces are each angled outward at about 65 degrees to about 75 degrees from horizontal.
Claims17
A composite fan blade having an airfoil with a leading edge and a trailing edge and a dovetail root, wherein the dovetail root comprises:
- a first pressure face and a second pressure face each angled outward at about 65 degrees to about 75 degrees from horizontal;
- a lower horizontal face connecting the pressure faces at the bottom of the dovetail;
- and
- a first and a second dovetail runout fillet connecting the first and the second pressure faces, respectively to the airfoil, wherein the dovetail is shaped to fit into a slot in a disc or a rotor and the angle of the pressure face is a particular angle within the range of about 65 degrees to about 75 degrees from the horizontal based on the size of the disc or the rotor.
A composite fan blade comprising:
- an airfoil with a leading edge and a trailing edge in a chordwise direction, a root and a tip in a spanwise direction;
- and
- a dovetail root, comprising:
- a first pressure face and a second pressure face each angled outward at an angle between about 65 degrees to about 75 degrees from horizontal and running from the leading edge to the trailing edge in the chordwise direction;
- a lower horizontal face connecting the pressure faces at the bottom of the dovetail;
- and
- a first and a second dovetail runout fillet connecting the first and second pressure faces, respectively, to the airfoil, wherein the angle of the pressure face is a particular angle within the range of about 65 degrees to about 75 degrees from the horizontal based on the size of the disc or the rotor.
A disc and composite fan blade assembly, the assembly comprising:
- a plurality of composite fan blades, each having an airfoil with a leading edge and a trailing edge in a chordwise direction, a root and a tip in a spanwise direction;
- and a dovetail root having a first pressure face and a second pressure face each angled outward at an angle between about 65 degrees to about 75 degrees from horizontal and running from the leading edge to the trailing edge in the chordwise direction, a lower horizontal face connecting the pressure faces at the bottom of the dovetail, and a first and a second dovetail runout fillet connecting the first and second pressure faces, respectively, to the airfoil;
- and
- a disc with a plurality of slots, each slot for holding the dovetail root of one of the plurality of composite fan blades, wherein the angle of each of the first and the second pressure faces is a particular angle within the range of about 65 degrees to about 75 degrees from the horizontal based on the size of the disc.
Dependencies are inferred from the claim text.