Abstract: An air guidance control unit having a frame, which surrounds at least one air opening for air flowing along an air flow direction to flow through, a closing device including adjustable flaps, which closing device can be adjusted by means of an adjusting element between an open position in which the air opening is exposed and a closed position in which the air opening is at least partly closed. The invention devises various solutions for especially compact and reliable flap arrangements.

Abstract: A variable volume rotary piston device displaces fluid simultaneously in the same direction in expansible outer chambers formed between the outer periphery of the rotary piston and the bore and in expansible inner chambers formed between the walls of a compartment in the rotary piston and a motion transmitting crankarm disposed within the compartment and integral with the shaft which operatively connects piston to shaft so that they rotate together in a one-to-one ratio and simultaneously rock the piston relative to the crankarm. The displacement in inner and outer chambers is out of phase and reduces ripple in the fluid output when the device is operated as a pump.

Abstract: A pressure compensated, variable volume, rotary piston device has a housing with an elongated cavity and inlet and exhaust ports; a reaction ring movable within the cavity and defining a cylindrical bore; a lenticular rotary piston rotatable and reciprocable radially within the bore and dividing it into first and second variable volume chambers; a shaft rotatably journalled in the housing and carrying a crankarm which constitutes the sole force transmitting means between shaft and piston and is operatively coupled to the piston so that shaft and piston rotate in a one-to-one ratio while the piston rocks relative to the crankarm and, without the use of phasing gears, the apices of the rotary piston remain in continuous contact with the bore in all positions of the rotary piston and in all positions of the reaction ring within the cavity and so cam the piston that it reciprocates within the bore as it rotates and varies the volume of the first and second chambers inversely from minimum to maximum and back to mi

Abstract: A rotary piston expansible chamber device without phasing gears has a crankshaft whose axis is offset from the center of the closed curve defining the working chamber cross section and a rotary piston operatively connected to the crankshaft through a crankarm so that crankshaft and piston rotate together in a one-to-one ratio and the rotary piston is displaced as it revolves to maintain arcuately spaced apices thereon in continuous sliding and sealing engagement with the working chamber walls and vary first and second expansible chambers formed on opposite sides of the rotary piston from minimum to maximum and back to minimum during each revolution of the crankshaft.