Patent ID: 8662828

Claim:
A high pressure turbine of a turbomachine comprising: an external casing; at least one distributor formed from an annular row of fixed guide vanes; a bladed wheel installed free to rotate on a downstream side of the distributor; an assembly forming a ring placed around rotating blades of the bladed wheel; a device to control radial clearance between tips of the rotating blades and the ring comprising a control box supporting drilled annular headers and fixed to the external casing at a location of at least two points at a distance from each other; an annular support including a support device which supports the ring at an inner periphery of the annular support, a wall extending in an upstream direction from the support device, and a radially extending flange connected to the wall for attaching the annular support to the external casing; and a shock absorbing annular element with a predetermined flexibility fixed to the annular support and supported by a simple axial bearing with a given pressure on an upstream side of the control box so as to absorb shock for at least some of vibrations of the box generated during operation of the turbomachine, wherein a first end of the shock absorbing annular element presents a continuous crown which is fixed to the wall of the annular support, a plurality of circumferentially spaced blades extend from the crown and are inclined relative to the crown, and each free end of the blade has a curve which bends radially outwardly and upstream so as to present a convex portion which axially bears against the upstream side of the control box.