Abstract: A tank system for motor vehicles includes a tank closure. The tank closure includes a tank filler neck which forms an access to a fuel tank, and a tank cap which, upon rotating, forms a sealing closure of the tank filler neck. Furthermore, the tank system includes a ventilation channel. A controllable actuating element is movable between an open position and a closed position. In the open position, a connection is opened to the ventilation channel, and the rotation of the tank cap is released. In the closed position, the connection to the ventilation channel is closed, and the rotation of the tank cap is blocked.

Abstract: The invention relates to a device (1) which uses ultrasound to measure the filling level for liquids in a tank (2). The device (1) consists of a housing (3) in which a piezoelectric disc (4) connected to a circuit board (5) and an energy store (6) is provided. A display unit (8) is arranged in the housing (3), and on the side of the piezoelectric disc (4) that faces the tank (2), the disc is given a layer (11) consisting of elastic material.

Abstract: The present invention provides a fuel cap adapted to close an inlet of a fuel tank. The fuel cap includes a body portion adapted to engage the inlet of the fuel tank. The body portion defines a central axis. The fuel cap also includes a valve coupled to the body portion. The valve selectively allows an airflow through the body portion. The fuel cap further includes a cap cover coupled to the body portion and movable along the central axis relative to the body portion.

Abstract: The invention relates to a device (1) which uses ultrasound to measure the filling level for liquids in a tank (2). The device (1) consists of a housing (3) in which a piezoelectric disc (4) connected to a circuit board (5) and an energy store (6) is provided. A display unit (8) is arranged in the housing (3), and on the side of the piezoelectric disc (4) that faces the tank (2), the disc is given a layer (11) consisting of elastic material.

Abstract: The invention relates to a device for displaying the selected gear in manual gearboxes of motor vehicles. The device comprises a display (6) and at least one acceleration sensor (7), which is situated on a gear lever (1), the inclination of the gear lever being measured.