Rotor disk for a turbomachine
View Patent ↗A rotor disk for a turbomachine, the disk carrying blades whose roots are retained in a peripheral groove of the disk, the groove including a window for inserting blade roots and a locking member that is a single elastically deformable piece and dimensioned to be received and retained in a notch of the groove while in its free state, and to be capable of being displaced to slide inside the groove while in a stressed and elastically deformed state.
1. A rotor disk for a turbomachine, the disk carrying blades whose roots are engaged in and retained in an outer peripheral groove of the disk, said groove including an insertion window for inserting the roots of the blades, and at least one retaining notch for retaining a one-piece locking member that is elastically deformable and of U- or Ω-shape, corresponding to the cross-sectional shape of the groove, which member is inserted in the groove via the window and is dimensioned so as to be received and retained in the at least one notch when in the free state substantially without stress or with little stress, and to be movable by sliding along the groove when in an elastically deformed and stressed state, wherein an opening of the locking member faces towards the bottom of the groove when the locking member is mounted in the groove.
2. A rotor disk according to claim 1 , wherein the locking member comprises a central portion and two lateral flanges or tongues connected to said central portion, together with a metal plate secured to the radially outer face of its central portion.
3. A rotor disk according to claim 2 , wherein the metal plate is of a shape that is complementary to the shape of the at least one retaining notch.
4. A rotor disk according to claim 2 , wherein the locking member is elastically deformed by pressing against its central portion in a radially inwards direction through the window in the groove and displacing said plate radially towards the bottom of the groove.
5. A rotor disk according to claim 4 , wherein the at least one retaining notch formed in the above-mentioned groove has two cavities formed facing each other in the side walls of the groove for the purpose of receiving the edges of the above-mentioned metal plate, which plate engages in said cavities by moving radially outwards when the locking member relaxes elastically.
6. A rotor disk according to claim 5 , wherein the two above-mentioned cavities open out radially in the cylindrical surface of the disk in which the groove is formed.
7. A rotor disk according to claim 1 , wherein the locking member comprises a folded or bent metal strip having the same shape as the cross-section of the groove and made out of a steel that withstands high temperatures.
8. A turbojet compressor including at least one rotor disk according to claim 1 .
9. A turbomachine including at least one rotor disk according to claim 1 .
10. A rotor disk according to claim 1 , wherein the locking member comprises a central portion and two lateral flanges or tongues connected to said central portion, together with a metal plate crimped to the radially outer face of its central portion.
11. A rotor disk according to claim 1 , wherein the locking member comprises a folded or bent metal strip having the same shape as the cross-section of the groove and made out of a nickel chromium alloy.
12. A turbojet including at least one rotor disk according to claim 1 .