Webasto Ag Fahrzeugtechnik

Perma-tec Gmbh&co.kg

Karl Grebe

Karl Panick

Anton May

Bernd Scheit

Stefan Brand

Claus Helbig

Georg Baechle

Peter Glaser

Susanne Bahrend

A lubricating system has a housing formed with an intake passage, a drive shaft extending longitudinally in the housing and carrying a plurality of longitudinally spaced worm gears, and respective pumps juxtaposed with the worm gears in the housing. Each pump has a cylinder fixed in the housing, centered on a respective transverse axis, and forming an intake port connected to the passage and an output port. A cavity-forming piston is rotatable about and reciprocal along the respective transverse axis and a worm wheel on the piston meshes with the respective worm gear. An axially projecting cam ramp on the worm wheel is axially engageable with an abutment on the housing. This abutment can be moved axially and for fixing it in any of a multiplicity of positions for varying axial deflection of the piston. A spring bearing against the piston urges the ramp toward the abutment. Rotation of the shaft rotates and reciprocates the piston for drawing in a lubricant at the intake ports and expelling it at the output ports so that the range of axial movement of the piston and the amount of lubricant pumped are determined by the axial deflection of the piston by the ramp.

Multiple-pump system for lubricating

A process for operating a burner fed with liquid fuel, in particular a vaporization burner of a heater in which, preferably, a motor vehicle add-on heater is involved. In this operating process, after the burner has been in steady state operation for a predetermined period, the fuel feed is briefly interrupted. The predetermined period of steady state operation of the burner is preferably about 5 to 20 minutes, while the fuel feed is interrupted for about 5 to 25 seconds. With this operating process, deposits on the burner can be reduced so that the service life of the burner can be considerably increased.

Process for operating a burner fed with liquid fuel

In a heating device, particularly one intended for use as a vehicle auxiliary heating device, a heat exchanger is provided for a liquid heat exchange medium, which is of a quadrangular, preferably cuboid design, having a planar closed end. Inside the heat exchanger, inner fins are provided defining exhaust gas channels, whose free ends are approximately on a circle whose center is the center axis of the heat exchanger or that of the cylindrical combustion chamber as a transition between the cylindrical combustion chamber and a rectanguloid outer housing which surrounds the heat exchanger. An outer, flat surface of the housing may be formed with a receiver for a control or similar device. For optimizing the transfer of heat from the hot combustion gases at the inner side of the heat exchanger to the liquid heat exchange medium at the exterior of the heat exchanger, baffles are provided on the outer surface of the heat exchanger for guiding the liquid heat exchange medium in a manner which facilitates removal of steam or air bubbles therefrom and which adapts the flow of the liquid heat exchange medium to the heat flow at the respective surface of the heat exchanger.

Heating device, particularly vehicle auxiliary heating device with a

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Starnberg, Germany

Karl Grebe