Abstract: An auxiliary heater device comprises a tubular combustion chamber surrounded by a heat exchanger 50 as to define a gap therebetween. The peripheral wall of the combustion chamber is provided with a plurality of circumferential projections that extend into the gap in a manner that reduces direct contact heat exchange between the combustion gases flowing through the gap and the peripheral wall by blocking axial flow of the gases along the wall in contact therewith and by deflecting these gases toward the heat exchanger pipe.

Abstract: An auxiliary heater for motor vehicles having a burner assembly for liquid fuels is provided with an electric motor whose shaft is coupled to a drive shaft for auxiliary assemblies, such as a combustion air blower, a fuel pump, a rotational atomizer, or the like, with the drive shaft being mounted at its distal end with respect to the motor and the proximal end of the drive shaft is connected to the motor shaft by way of a flexible elastic coupling. In a preferred embodiment, the combustion air blower is disposed between the motor and the fuel pump and has a hub of flexible elastic material which serves as the coupling element between the motor shaft and the drive shaft. According to a further disclosed feature, the drive shaft extends through the radial bearing and supports a rotational atomizer head at its distal end.

Abstract: Fuel feeding apparatus is provided for a vehicle heater of the type having a combustion air fan connected by a combustion air feed line to a heater combustion chamber. A venturi tube is arranged in the feed line downstream of the combustion air fan and a fuel feed line and fuel nozzle opens into the air feed line at the venturi tube. A diaphragm pump is provided which has a first chamber, a fuel supply line inlet and an outlet at the fuel feed line to the venturi tube and a second chamber communicated with the air feed line at a position spaced from the venturi tube. A check valve is provided in the fuel feed line and a closure valve is provided at the fuel supply line leading to the first chamber. Movement of the diaphragm in the pumping direction is controlled exclusively by a pressure difference at the venturi tube and at the air feed line upstream of the venturi tube, while the suction stroke is controlled by an electromagnet.

Abstract: A liquid fuel burning heater for vehicles in which the burner unit has a housing which is surrounded by a radially spaced casing, and the heat exchanger has spaced inner and outer jackets axially aligned with the housing and casing, so that the air flows between them past the latter into the former. The casing and at least the outer jacket of the heat exchanger are integral parts of a unitary casting; the burner unit may be a self-contained subassembly, pre-assembled in its housing.