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The invention relates to a bearing housing body group (1) of an exhaust-gas turbocharger, having a housing (2) for a bearing arrangement of a rotor shaft (3); having a turbine wheel (4) on one end (5) of the rotor shaft (3); having a compressor wheel (6) on the opposite end (7) of the rotor shaft (3

The invention relates to a bearing housing body group (1) of an exhaust-gas turbocharger, having a housing (2) for a bearing arrangement of a rotor shaft (3); having a turbine wheel (4) on one end (5) of the rotor shaft (3); having a compressor wheel (6) on the opposite end (7) of the rotor shaft (3); and having a compressor-wheel-side housing cover (8) which can be fixed by means of a fastening device (9) in a compressor-wheel-side housing opening (10), wherein the fastening device (9) is designed as a bayonet connection.

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1. A bearing housing body group (1) of an exhaust-gas turbocharger comprising: a housing (2) for a bearing arrangement of a rotor shaft (3);a turbine wheel (4) on one end (5) of the rotor shaft (3);a compressor wheel (6) on an opposite end (7) of the rotor shaft (3); anda compressor-wheel-side housi

1. A bearing housing body group (1) of an exhaust-gas turbocharger comprising: a housing (2) for a bearing arrangement of a rotor shaft (3);a turbine wheel (4) on one end (5) of the rotor shaft (3);a compressor wheel (6) on an opposite end (7) of the rotor shaft (3); anda compressor-wheel-side housing cover (8) fixed by means of a fastening device (9) in a compressor-wheel-side housing opening (10), wherein the compressor-wheel-side housing cover (8) is located substantially entirely within the housing (2), wherein the compressor-wheel-side housing cover (8) is substantially flush with an axially outermost face of the housing (2), and wherein the fastening device (9) is a bayonet connection. 2. The bearing housing body group according to claim 1, wherein the bayonet connection (9) has a web arrangement (11) on the housing cover (8) and a groove arrangement (12) in the housing opening (10). 3. The bearing housing body group according to claim 2, wherein the web arrangement (11) has three webs which are arranged uniformly on the periphery of a web ring (21) of the housing cover (8) and which can be inserted into an annular groove arrangement (12) of the housing opening (10). 4. The bearing housing body group according to claim 3, wherein the annular groove arrangement (12) includes three insertion recesses (13, 14). 5. The bearing housing body group according to claim 1, wherein the housing cover (8) has a holding groove (15, 16) for holding an O-ring (17). 6. The bearing housing body group according to claim 5, wherein the holding groove (15) is formed so as to be open at one of its two end sides. 7. The bearing housing body group according to claim 5, wherein the holding groove (16) is formed so as to be closed at both end sides. 8. A bearing housing body group (1) of an exhaust-gas turbocharger comprising: a housing (2) for a bearing arrangement of a rotor shaft (3);a turbine wheel (4) on one end (5) of the rotor shaft (3);a compressor wheel (6) on an opposite end (7) of the rotor shaft (3); anda compressor-wheel-side housing cover (8) fixed by means of a fastening device (9) in a compressor-wheel-side housing opening (10), wherein the fastening device (9) is a bayonet connection, wherein the bayonet connection (9) has a web arrangement (11) on the housing cover (8) and an annular groove arrangement (12) in the housing opening (10),wherein the annular groove arrangement (12) includes part ring grooves (24), wherein an end of each part ring groove (24) includes a recess (25) having a contact surface (26) and a latching edge (27). 9. A bearing housing body group (1) of an exhaust-gas turbocharger comprising: a housing (2) for a bearing arrangement of a rotor shaft (3);a turbine wheel (4) on one end (5) of the rotor shaft (3);a compressor wheel (6) on an opposite end (7) of the rotor shaft (3); anda compressor-wheel-side housing cover (8) fixed by means of a fastening device (9) in a compressor-wheel-side housing opening (10), wherein the fastening device (9) is a bayonet connection,wherein a spring plate (18) for fixing an axial bearing (19) of the rotor shaft (3) is arranged between and directly operatively engages the axial bearing (19) and the housing cover (8).