Patent ID: 8596315

Claim:
A filling neck to feed fuel into a motor vehicle tank using a filling nozzle, comprising: a slotted drive ring made of a resilient material or being radially prestressed and having a gap parallel to an axis of said slotted drive ring and comprising an insertion portion conically tapering toward the motor vehicle fuel tank, and further including a cross-sectional constriction being less than the filling nozzle's cross-section, the drive ring comprises a locking segment on at least one side of said gap at an end facing the fuel tank, the drive ring is configured in floating manner in a cup-shaped housing portion of the filling neck, said ring having an outside diameter being less than the inside diameter of the cup-shaped housing portion in a relaxed state, a sealing element is associated with a distal end of the drive ring and in a closed position blocks access to the tank, the locking segment engages the sealing element and keeps it in the locked position, the sealing element being moved out of a closed position into the open position when said drive ring is expanded by the filling nozzle and the locking segment releases the sealing element, wherein an affixation ring is detachably mounted, on the side of the drive ring opposite the sealing element, in the filling neck and clamps in place the drive ring relative to a direction opposite that of the direction of insertion of the filling nozzle.