The invention relates to a combustion chamber comprising a bottom wall (4) comprising at least one opening (5), at least one sleeve (12) mounted upstream of the bottom wall (4) and fixed to the bottom wall. (4), a closure ring (13) delimiting an annular groove (11) with the sheath (12) and fixed to the sheath (12), at least one system (6) for injecting air and fuel, having an axis (A), mounted in the opening (5) of the bottom wall (4), the injection system (6) comprising an annular flange (10) extending radially relative to said axis (A), mounted in said groove (11) with a radial clearance, a deflector (14) located downstream of the bottom wall (4), fixed to the sheath (12) and / or to the bottom wall (4).
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