Daimler Chrysler Ag

Obrist Engineering Gmbh

Diamler Chrysler Ag

Daimler Ag

Roland Cäsar

Peter Kuhn

Jürgen Wertenbach

Frank Obrist

Jan Gärtner

Klaus Harm

Jan Gartner

Steffen Geiger

Joan Aguilar Rojas

Klaus-Dieter Mörgenthaler

Gunnar Rausch

In an air-conditioning system for a motor vehicle having an internal combustion engine with an engine cooling circuit with a heat exchanger for heating and a heat pump with a refrigerant circuit including a heat exchanger for cooling the interior compartment of the motor vehicle, the refrigerant circuit includes also heat exchanges for heating or for cooling the coolant in the engine cooling circuit.

Air-conditioning system for a motor vehicle

In a reciprocating-piston machine, in particular a refrigerant compressor for a motor vehicle air-conditioning system, including a machine shaft, a plurality of pistons are arranged, at the same distance from the machine shaft, on a cylinder envelope defined by the axes of the pistons and extending around the machine shaft, and an annular pivoting disc which is driven by the machine shaft and which engages the pistons via a joint arrangement, the joint arrangement has an at least partially spherical receptacle, in which at least one sliding element structure is arranged moveably relative to the associated piston and relative to the pivoting disc, including a first sliding element having a first sliding face in the form of a spherical segment with a first geometric center (M, M), and a second sliding element having a second sliding face in the form of a spherical segment with a second geometric center (M, M) arranged at a distance from the first geometric center.

Reciprocating-piston machine with a joint arrangement

In a reciprocating-piston machine, in particular a refrigerant compressor for a motor vehicle air-conditioning system, including a machine shaft rotatably supported in a housing, a plurality of pistons arranged circularly around the machine shaft in the housing, and an annular pivoting disc driven by the machine shaft and engaging the pistons via a joint arrangement, the pivoting disc being connected in an articulated manner to the machine shaft via a driver for transmitting the machine shaft drive forces to the pistons and mounted on a machine shaft-supported sliding body so as to be pivotable about a hinge axis oriented transversely to the machine shaft, the sliding body has an elongated recess which is open at one axial end for receiving the driver and the sliding body further includes at its inside adjacent the machine shaft a cavity, which is in communication with a bore forming a discharge passage extending through the machine shaft.

Reciprocating-piston machine with a sliding sleeve

In a reciprocating-piston machine, in particular a refrigerant compressor for a motor vehicle air-conditioning system, comprising a machine shaft rotatably supported in a housing with a plurality of pistons arranged circularly around the machine shaft and an annular pivoting disc extending around, and being driven by, the machine shaft, wherein the annular pivoting disc engages the pistons via a joint arrangement disposed on a driver extending from the shaft for transmitting shaft drive forces to the pistons, the annular pivoting disc being supported by a sliding body mounted on a shaft and being pivotable about a hinge axis oriented transversely to the machine shaft, the joint arrangement of the driver is located outside a main center-plane, which extends perpendicularly to the hinge axis and through the axis of rotation of the machine shaft.

Reciprocating-piston machine with a driver

In an air-conditioning system for a motor vehicle having an integrated heat pump for cooling and heating, in which refrigerant is circulated and which allows heat exchange with the incoming air for the interior compartment of the motor vehicle, the heat transfer is effected either directly, by means of a refrigerant/air heat exchanger through which the air for the interior compartment is conducted, or by means of a secondary refrigerant circuit, which includes two expansion devices and three heat exchangers provided in the refrigerant circuit of the system.

In a needle valve () for a high-pressure gas conduit system consisting of two units () which are joined and one of which encloses a stepping motor () and the other includes gas flow passages and a gas flow control bore (), a valve needle () is supported in the housing unit so as to be movable by the stepping motor and extends into the gas flow control bore () in the other housing unit through a guide passage () provided with seals to prevent gas from flowing to the housing unit including the stepping motor () between a region of the guide bore () and a low pressure region of the needle valve () a compensation connection is provided for relief of pressure at the sealing region () of the guide bore (). The needle valve is particularly suitable as an expansion valve in an automotive COair conditioning system.

Needle valve

In a piston for a compressor, the piston comprises a stem by which the piston may be guided in the housing in an axially displaceable manner, and a force introducing section where an outer drive force can be introduced into the piston. The piston head, the piston skirt and the force introducing section are successively arranged in the direction of the piston axis. The piston head, the piston skirt and the force introducing section are produced as a single element of graphite or a synthetic material, and the piston skirt comprises a solid strut structure and a guide section, the cross-sectional area of the strut structure being smaller than the surface of the piston head. The piston consists of a non-organic, non-metallic material having an average thermal expansion of less than 7&#xd7;10/&#xb0; C. in the temperature range of 0&#xb0; C. to 200&#xb0; C.

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Stuttgart, Germany

Roland Cäsar