Turbine unit for a supercharging device

A turbine unit (10) for a supercharging device (1), comprising:

• a bearing housing (30), and
• a turbine housing (20), which is coupled to the bearing housing (30) via a flange connection (100), the flange connection (100) comprising:
• a turbine-housing-side flange (110), and
• a bearing-housing-side flange (120),
• the turbine-housing-side flange (110) and the bearing-housing-side flange (120) being designed and coupled to each other in such a way that they form an axial distance region (130) and an axial contact region (140) of the flange connection (100), the turbine-housing-side flange (110) and the bearing-housing-side flange (120) being continuously spaced apart from each other in the axial distance region (130) in the axial direction (22) during operation of the turbine unit (10),
• the axial contact region (140) being arranged radially on the inside with respect to the axial distance region (130),
• wherein a radial distance (RD) between an outer radius of the axial contact region (RKA) and a circumferential radius (RF) of the bearing-housing-side flange (120) is at least 3.50 mm, and
• wherein the axial contact region (140) has a first radial width (R1) and wherein the axial distance region (130) has a second radial width (R2), wherein a ratio of the first radial width (R1) to the second radial width (R2) lies in a range of 0.20 to 0.45,
• wherein the turbine-housing-side flange (110) and the bearing-housing-side flange (120) are designed and coupled to each other in such a way that they form at least one shoulder (160). which provides a radial centering surface pairing, and
• wherein the shoulder (160) is arranged in the radial direction (22) in the axial distance region (130), wherein the shoulder (160) divides the axial distance region (130) into a first axial distance region (131) and at least one second axial distance region (132), wherein the first axial distance region (131) is arranged in the radial direction (24) between the shoulder (160) and the axial contact region (140), and wherein the second axial distance region (132) is arranged in the radial direction (24) between the shoulder (160) and the circumferential radius (RF) of the bearing-housing-side flange (120).