Turbine stage for a turbine engine

A turbine stage for a turbine engine, the stage comprising:

• a stationary nozzle and a wheel mounted downstream from the nozzle and inside an annular casing,
• the nozzle being attached to the casing and being retained axially downstream by bearing against an annular split ring mounted in an annular groove of a rail of the casing,
• the wheel being mounted inside a sectorized ring carried by the casing, the sectorized ring including a plurality of ring sectors, each ring sector including, at an upstream end thereof, a C-shaped member that is engaged on the casing rail and that holds the split ring radially in the groove,
• a radially inner wall of the C-shaped member of each ring sector extends inside the split ring over an entire axial dimension thereof, and an upstream end portion of the radially inner wall of the C-shaped member of each ring sector is engaged inside and enclosed by a first recess and a second recess of the nozzle,
• an upstream circumferential edge of the radially inner wall of the C-shaped member of each ring sector including at least one notch co-operating with complementary means of the nozzle to prevent each ring sector from moving in rotation relative to the nozzle,
• wherein the nozzle includes a radially outer annular tab at a downstream end thereof, the tab including an outer cylindrical surface for bearing radially against the casing rail and a downstream radial surface for bearing against the split ring, the first recess and the second recess being formed in the tab and opening out downstream in the downstream radial surface, and
• wherein the first recess and the second recess are separated from each other by an axial extra thickness of the tab, a first circumferential end of the first recess and a first circumferential end of the second recess being closed by the axial extra thickness of the tab, a second circumferential end of the first recess being closed by a first web of material of the tab extending axially downstream, a second circumferential end of the second recess being closed by a second web of material of the tab extending axially downstream, and the first recess being circumferentially longer than the second recess.