TIP-FORMING ELEMENT FOR HYDRAULIC MACHINE WHEEL, METHOD OF ASSEMBLING ONE SUCH WHEEL, AND WHEEL AND HYDRAULIC MACHINE EQUIPPED WITH ONE SUCH ELEMENT

摘要

The invention relates to a tip-forming element (10) comprising an axisymmetric surface (11a) which can be disposed in the extension of the wetted surface (31a) of the top (3) or the hub of a hydraulic machine wheel and which converges as it extends away from the wetted surface (31) in the direction of the axis of rotation (X - X') of the wheel (1) when the element is attached to the wheel (1). The inventive element (10) also comprises a second axisymmetric surface (13a) which is offset axially in relation to the first axisymmetric surface (11a) and which diverges as it extends away from the first convergent surface (11a).