Motorized drive device of an occultation or solar protection device, occultation or solar protection device and associated installation

The invention relates to a motorized drive device (10), comprising a casing (43), an electric motor, a drive wheel (13), first and second holding devices (37, 39), a first elastic return element (44), a drive unit (49), which is configured to be housed inside the housing (43), and a switching mechanism (41, 42). The drive unit (49) comprises a housing (50), the electric motor (11) and the drive wheel (13). The first elastic return element (44) is configured to cooperate, on the one hand, with the casing (43) and, on the other hand, with the housing (50). The drive wheel (13) is configured to be supported on a running surface of a rail by means of the first elastic return element (44). Furthermore, when the electric motor (11) is electrically activated, the housing (50) is configured to be inclined inside the casing (43) with respect to a median plane (P) of the housing (43). The switching mechanism (41, 42) is configured to drive at least one first guide wheel (38a) of the first holding device (37) between a first position, in which the motorized drive device (10) is configured to be mounted relative to the rail, and a second position, in which the motorized drive device (10) is configured to be disassembled with respect to the rail, and vice versa. In the first position and when the electric motor (11) is electrically activated, the drive wheel (13) is supported on the running surface of the rail by means of the first elastic return element (44), which is supported on a wall (52) arranged in the housing (43), and is driven in rotation about the axis of rotation (X13) by means of the electric motor.