Catcher ring arrangement

摘要

This invention relates to a blade assembly comprising: a hub which is rotatable about an axis; at least one blade having an aerofoil portion and a root, wherein the root is coupled to the hub using a primary retention device which prevents radial separation of the root and hub in normal use; and, a secondary retention device which comprises an annular catcher having a restriction through which the root portion cannot radially pass, the restriction being located radially outwardly and radially spaced from the root part during use.

主权项

1. A blade assembly comprising:
a hub which is rotatable about an axis; at least one blade having an aerofoil portion and a root, wherein the root is coupled to the hub using a primary retention device which prevents radial separation of the root and the hub in normal use; and a secondary retention device which comprises an annular catcher having a restriction aperture through which the root cannot radially pass, the restriction aperture being located radially outwardly and radially spaced from the root during use, wherein the annular catcher comprises at least two sections that abut one another along a parting line, the parting line passing through the restriction aperture, the at least two sections are annular rings defining the restriction aperture and at least one additional restriction aperture, and the parting line passes through each of the at least one additional restriction aperture.