Abstract: A rotatingly driven filter element for filtering incoming air is to be arranged in a machine part upstream of an intake chamber of a cooling system or of a combustion air distribution device of an internal combustion engine of a self-propelled working machine. The filter element has a rim area with a circumferentially extending section provided with air guiding elements oriented toward and projecting into the intake chamber. The rim area, when the filter element is arranged in the machine part, is positioned at a minimal spacing relative to the machine part and an air gap is formed between the rim area and the machine part. The air guiding elements guide purified inflow air out of the intake chamber into a region of the air gap to effect a sealing action of the air gap.

Abstract: A compressor unit including a centrifugal compressor for compressing a gas and an electric motor with a stator and a rotor for driving the compressor. The compressor and the electric motor are accommodated in a common gastight housing, provided with a gas inlet and a gas outlet. The stator is accommodated in a separate stator space which is delimited by a wall section, surrounding the stator, of the housing, a gastight partition which extends freely between the stator and the rotor of the electric motor, and at least one end wall which extends between the partition and the housing of the compressor unit. The partition is of a material of such high strength that it remains clear of the stator and the rotor under working pressures of the gas.

Abstract: A compressor unit including a centrifugal compressor for compressing a gas and an electric motor with a stator and a rotor for driving the compressor. The compressor and the electric motor are accommodated in a common gastight housing, provided with a gas inlet and a gas outlet. The stator is accommodated in a separate stator space which is delimited by a wall section, surrounding the stator, of the housing, a gastight partition which extends freely between the stator and the rotor of the electric motor, and at least one end wall which extends between the partition and the housing of the compressor unit. The partition is of a material of such high strength that it remains clear of the stator and the rotor under working pressures of the gas.