A combustion chamber of an aircraft engine comprising at least: - a baffle comprising at least one tubular portion, the tubular portion extending in the direction of a reference axis, the tubular portion having a first upstream end surrounded by a first radially projecting collar; - an injection system comprising at least one bowl which in turn comprises a cylindrical portion inserted into the tubular portion, the cylindrical portion comprising a second upstream end that exits the first upstream end of the tubular portion, the second upstream end of the cylindrical portion being surrounded by a second radially projecting collar, the second collar being braced axially against the first collar; the combustion chamber being characterised in that it further comprises: - clamping means that clamp the first and the second collars (10, 12) against one another axially and that comprise a retaining bushing bearing axially against the first collar and a retained bushing bearing axially against second collar, the retaining bushing (37 and the retained bushing being conformed such that they are able to slot into one another, and - attachment means that retain the clamping means clamped on either side of the first and second collars (10, 12), the retaining bushing being split into at least two bushing sections and comprising at least: ∘ a retaining ring bearing axially against the first collar, and ∘ a peripheral retaining skirt projecting axially from the retaining ring, the peripheral retaining skirt surrounding the first and second collars (10, 12) radially, and the retained bushing comprising at least: ∘ a retained ring bearing axially against the second collar, and ∘ a peripheral retained skirt projecting axially from the retained ring, the peripheral retained skirt surrounding the peripheral retaining skirt radially; the attachment means holding together the retaining bushing and the retained bushing such that the retaining ring and the retained ring hold the first and second collars (10, 12) clamped against one another so that no relative axial movement between the two is possible. - a baffle comprising at least one tubular portion, the tubular portion extending in the direction of a reference axis, the tubular portion having a first upstream end surrounded by a first radially projecting collar; - an injection system comprising at least one bowl which in turn comprises a cylindrical portion inserted into the tubular portion, the cylindrical portion comprising a second upstream end that exits the first upstream end of the tubular portion, the second upstream end of the cylindrical portion being surrounded by a second radially projecting collar, the second collar being braced axially against the first collar; - clamping means that clamp the first and the second collars (10, 12) against one another axially and that comprise a retaining bushing bearing axially against the first collar and a retained bushing bearing axially against second collar, the retaining bushing (37 and the retained bushing being conformed such that they are able to slot into one another, and - attachment means that retain the clamping means clamped on either side of the first and second collars (10, 12), ∘ a retaining ring bearing axially against the first collar, and ∘ a peripheral retaining skirt projecting axially from the retaining ring, the peripheral retaining skirt surrounding the first and second collars (10, 12) radially, and ∘ a retained ring bearing axially against the second collar, and ∘ a peripheral retained skirt projecting axially from the retained ring, the peripheral retained skirt surrounding the peripheral retaining skirt radially;