Abstract: The invention relates to a lamp base comprising a plastic base part (320) that is provided with electric connections (61, 62, 63) for supplying power to at least one luminous means (21, 22) of the lamp that is surrounded by the lamp vessel (10). The electric connections (61, 62, 63) comprise contact sections (610, 620, 630) for connecting to power supply lines (51, 52, 53) of the at least one luminous means (21, 22), that protrude from the lamp vessel (10), and the lamp base is equipped with a sealing element (330) for covering the contact sections (610, 620, 630), said sealing element being fixed to the plastic base part (320) by a detent connection (3213, 3223, 3311, 3312, 3321, 3322). Said detent connection is preferably concealed. Said lamp base can be used, for example, in a motor vehicle headlight.

Abstract: A turbocharger as a turbo machine includes: a compressor impeller (13) having a projected portion (19) at a center of a rear surface; a drive shaft (15) connected to a bottomed coupling hole (20) provided in the projected portion (19) of the compressor impeller (13) through interference fit only; and a sleeve (30) with a cylindrical portion (33) connected to the outer peripheral portion of the projected portion (19) of the compressor impeller (13) by fitting only. The sleeve (30) is formed of a material whose coefficient of linear expansion is smaller than that of the compressor impeller (13). Accordingly, even when the coupling hole (20) in the projected portion (19) undergoes thermal expansion and the diameter of the coupling hole (20) increases, a connection between the drive shaft (15) and the coupling hole (20) can be prevented from being loosened since the radial increase thereof is suppressed by the cylindrical portion (33). Thus, the state of the connection thereof can be well maintained.