STORAGE TANK FOR AQUEOUS UREA SOLUTION IN A MOTOR VEHICLE

摘要

The invention relates to a storage tank (1) in a motor vehicle for receiving an aqueous urea solution for the SCR of nitrogen oxide in the exhaust gas. The storage tank (1) comprises a tank body which forms a storage volume (2) for the urea solution. The storage tank (1) furthermore comprises a filling pipe for filling the storage volume (2) and means for venting the storage volume (2) during the refuelling, wherein the filling pipe (3) has a filling head (9) at a remote end, and the filling head (9) forms an orifice stub (10). The orifice stub (10) defines an orifice (11) for receiving a fuel pump nozzle. Said orifice stub furthermore has an external thread for receiving a complementary union thread of a refuelling cylinder for refuelling by the gas displacement method. The orifice stub forms at least one secondary air opening when the refuelling cylinder is attached, and therefore, when a refuelling cylinder is attached, a sealing seat is bridged by the refuelling cylinder and refuelling by the gas displacement method is possible even if counterflow venting through the filling tube (3) does not take place.