Knorr-bremse Systeme Fur Schienenfahrzeuge Gmbh

Klaus-Michael Schneider

Michael Hartl

Christian Achatz

Gerhard Pröll

Compressor arrangement for generating compressed air using a motor-operator compressor unit, downstream of which at least one cooler unit is connected for cooling the generated compressed air, which enters the cooler unit via at least one inlet, flows there through a cooling structure, from a plurality of cooling passages connected in parallel and leaves the cooler unit via at least one outlet, wherein a permanently open bypass pipe is provided between the region of the inlet and the region of the outlet, the inner cross section of which bypass pipe is matched to the delivery capacity of the compressor unit and to the pressure difference between inlet and outlet such that the bypass pipe, at normal ambient temperatures, causes a higher flow resistance than the cooling structure, whereas, as freezing of the cooling structure progresses, the compressed air flows increasingly via the bypass pipe.

Compressor arrangement with bypass means for preventing freezing of the cooling unit

The invention relates to a dry-running piston compressor, in particular for rail vehicles. Said compressor comprises a crankcase () for a crankshaft () that is rotatably mounted in said crankcase, the latter being provided with at least one pot-type cylinder () comprising a corresponding internal piston (). According to the invention, the crankshaft () is connected to one end of a connecting rod () by means of a connecting rod hearing (), which forms the first hearing point, in order to convert the rotational displacement into a linear displacement for the piston () that is mounted at the other end of the connecting rod () by means of a piston pin bearing (), which forms the second bearing point. At least one lubricating nipple () is mounted on the exterior of each connecting rod () for relubricating the bearing point(s). A corresponding internal lubrication channel () runs from said nipple and discharges onto the connecting rod () and/or onto the piston pin bearing ().

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Markt Indersdorf, Germany

Klaus-Michael Schneider