Rotary electrical machine provided with pulley for receipt of belt, and with device for regulation of tension of belt

A rotary electrical machine, comprising:

• a housing (1a, 1b) including a front support flange (1a), the housing configured to be secured to a stationary part;
• a rotor (20) and a rotor shaft (9) integral with the rotor (20);
• a regulation device (100) configured to regulate the tension of a belt;
• and
• a pulley (3) provided with a groove (31), the pulley (3) non-moveably secured relative to the rotor shaft (9) at a front of the housing adjacent to the front support flange (1a), the rotor shaft (9) passing through the front support flange (1a) of the housing;
• the front support flange (1a) comprising a base (238, 138, 28, 18) provided with a nose (18) receiving a front ball bearing (7) for rotation of the rotor shaft (9), a peripheral strip of material (238) and air inlet openings (15) delimited by arms (138, 28) which connect the nose (18) to the peripheral strip of material (238) of the base;
• the arms (138, 28) belong to a widened area (138, 28) of the base which widens towards the exterior, connecting the peripheral strip of material (238) to the nose (18), the peripheral strip of material (238) of the base is axially offset from the nose (18) and the front ball bearing (7) so that the nose (18) is disposed axially between the pulley (3) and the peripheral strip of material (238);
• the belt being received in the groove (31) in the pulley (3);
• the regulation device being secured on the housing (1a, 1b), the regulation device (100) comprising at least one roller (200, 201) for tensioning the belt, and a central opening (102) permitting passage of air through the air inlet openings (15);
• the central opening (102) of the regulation device (100) disposed radially around the nose (18) and the arms (138, 28) of the base (238, 138, 28, 18) of the front support flange (1a);
• the offsetting of the nose (18) at the front relative to the peripheral strip of material (238) depends on a central thickness of the regulation device (100).