Abstract: A liquid tank includes a tank wall enclosing a tank volume and at least one relief structure facing the tank volume on an inner side of the tank wall. The relief structure is formed as one-piece with the tank wall. Two shell parts can be joined along a joining surface to make a section of the tank wall. One of the shell parts can include a tank bottom. At least one part of the relief structure can be formed on the tank bottom. The relief structure can include projections protruding into the tank volume along a local direction of projection.

Abstract: An operating fluid storage system for a motor vehicle having a reservoir with a filling opening and a closure cover which closes the filling opening and which can be removed from said filling opening to release the filling opening, and with at least one operating fluid outlet opening, to which an operating fluid conveyor line can be connected, for the output of operating fluid to a consumer, the system having a need sensor assembly and an output device, the need sensor assembly determines a filling need of the reservoir and outputs a corresponding need signal to the output device which acoustically, visually and/or haptically outputs a signal indicating the filling need; on the reservoir, an identification device is provided, which can be switched between at least two functional states and which is connected to the need sensor assembly via signal transmission, and which, when the need sensor assembly determines a filling need of the reservoir, is actuated by a corresponding need signal of the need sensor asse

Abstract: On a liquid tank (10) for motor vehicles a relief structure (40) facing the tank volume (32) is at least sectionally provided on an inner side (30a) facing the tank volume (32). The relief structure (40) is inventively as configured one-piece with the tank wall (30).

Abstract: An air flap device, preferably for use in motor vehicles, comprising a housing that defines a flow passage opening, at least one air flap that is accommodated movable on the housing such that by adjusting the air flap relative to the housing the effective flow cross-section of the flow passage opening can be changed, a heat source arranged in the air-flow direction behind the at least one air flap, an energy source that is separate from the heat source, and at least one controllable flap actuator that can be controlled by a control unit (20) which has an energizing connection to the separate energy source, for adjusting an air flap relative to the housing. In this context, at least one automatic flap actuator is also provided, which is supplied with thermal energy provided directly by the heat source for adjusting an air flap relative to the housing.