Abstract: In order to be able to use materials of higher strength without the danger of cracks arising during deformation, it is proposed, with reference to a heat exchanger having lamella fins, which are held at a distance from and parallel to each other by shaped collars on the lamella fins and which are penetrated by pipes running parallel to each other in passages through the collars, the internal diameter of the passage in each case matching the external diameter of the pipe and at least partially contacting the external periphery of the pipe, while at the same time exactly preserving the distances between the lamella fins, that tongues are distributed on the periphery of the punched rim of the passage, the free ends of the tongues are bent at an angle to the pipe projecting through the passage, and that these bent tongues provide space locating surfaces for the adjacent parallel lamella fin. Also disclosed is a heat exchanger assembly.

Abstract: A method for controlling a motor vehicle air conditioning system is described. The motor vehicle air conditioning system comprises a refrigeration circuit including a refrigerant compressor, a condenser, an evaporator and a throttle device arranged upstream of the evaporator. The condenser is associated with a ventilating fan and the evaporator is associated with a blower. The compressor capacity, the condenser capacity and the evaporator capacity are directly or indirectly sensed by sensor means and supplied as electrical variables to an electronic control circuit which logically combines these input signals and generates output signals in dependence on at least two of these capacity values and including further parameters. The control circuit acts on electrically controllable acturators for influencing the compressor capacity, the condenser capacity and/or the evaporator capacity.

Abstract: In the case of a method of separating condensable harmful substances and solid particles from the process gas or used air from particularly a textile finishing plant such as for example a drier or a coating plant, for example in the paper or synthetic plastics industry, the used air is pre-filtered, cooled and passed through a mechanical final filtering apparatus. So that a considerable extent of separation from the used air is possible already at the pre-filtering stage, the warm used air is pre-filtered by being cooled to below the dewpoint of the condensable harmful substances and dispersed solid particles. The resultant condensate which contains impurities is extracted.

Abstract: A heat exchanger for cooling the cooling water and the charge air of an internal combustion engine, comprising an air-to-water cooler for the cooling water and an air-to-water cooler for cooling the compressed charge air, the air-to-air cooler being arranged in the air-flow direction, preferably in front of the air-to-water cooler, and the air-to-water cooler having lateral fixing projections and/or recesses for fixing to a supporting frame, in particular of a vehicle, wherein the air-to-water cooler has additional fixing means for the air-to-air cooler in which the latter, with allocated projections, is hung in place and held.

Abstract: A carrier matrix wound of a carrier strip having undulations in its transverse direction has deflections of the carrier strip, said deflections being arranged in planes. During the winding process, the deflections are created by the insertion of deflection pins between the corresponding winding layers. The deflections pins, in this case, are inserted between the winding layers as a function of the desired cross-section of the carrier matrix so that after the winding process and after the removal of the deflection pins, the carrier matrix can be inserted into a sheath that has the desired cross-section of the carrier matrix. By combining several winding bodies of this type into one carrier matrix, arbitrary cross-sections of carrier matrices can be produced, particularly cross-sections having concave archings. During the making process, the deflection pins are fitted through the corresponding bores of two winding disks that are connected with one another in a torsionally fixed way.

Abstract: In a clamping connection between a plastic water tank equipped with at least one flange and a heat-exchanger tube sheet carrying a deformable edge region, an elastic sealing device being retained therebetween under prestress, and the deformable edge region, before its deformation, extends parallel to the outer contour of the flange and, after its deformation to make the clamping connection, it has first partial regions deformed in an approximately wave-shaped manner over the flange of the plastic water tank, and non-deformed further partial regions extending parallel to the outer contour of the flange. The first partial regions deformed over the flange of the plastic water tank make a positive connection, in which the lower edges of the deformed first partial regions rest on the top side of the flange under prestress. To make deformation easier, the deformable first partial regions are cut free parallel to and at a distance from an outer edge at the height of the flange top edge.

Abstract: In an air conditioner for a motor vehicle, which, for the purpose of contling the humidity, has in the ir duct suitable devices, controlled by a microcomputer. The microcomputer receives values for outside temperature, inside temperature and inside humidity, measured by sensors. From the values for outside temperature, inside temperature and inside humidity, the microcomputer determines the threshold humidity (l.sub.thresh) as the ratio of the saturated vapor pressure (P.sub.S) inside at the pane and the saturated vapor pressure (P.sub.i) of the inside air. If this difference (.DELTA.l) between threshold humidity (l.sub.thresh) and inside humidity (l.sub.i) falls below a stipulated value (x), dehumidification devices are actuated. If the stipulated value is exceeded, humidification devices are actuated.

Abstract: An apparatus for the air-conditioning of the interior of automobiles, with a refrigerant circuit, including a low-pressure part and a high-pressure part and in which vaporous refrigerant is drawn off from the evaporator by a compressor and, while experiencing an increase in pressure, the refrigerant is fed to a condenser for cooling and condensation. The condensed refrigerant is collected in a collecting vessel from which it can be diverted via an expansion valve into the evaporator while experiencing a pressure drop and cooling. A pressure-relief valve witha blow-out outlet is proided between the compressor and the condenser in the high-pressure part of the refrigerant circuit. The blow-out outlet of the pressure-relief valve is connected to an intermediate reservoir for the escaping refrigerant.

Abstract: Disclosed is a heat exchanger, comprising a tube sheet comprised of plastic and having at least one opening for passage of a heat exchange fluid; and a heat exchanger tube sealed against the tube sheet at the opening, wherein the tube sheet includes in the region of each of the openings a sleeve-like connection nozzle in which an annular groove is defined by inner and outer parts of said nozzle. The groove extends coaxially to the opening and is open toward the heat exchanger tube and the end of the heat exchanger tube is pressed into the groove. The sleeve-like connection nozzles have a middle section (B), which is located in the plane of the tube sheet, and end sections, (A, C) which project on either side of the tube sheet.

Abstract: Heat exchanger having a tube plate made of plastic, in which metallic tubes are fixed. The tube plate has elevations having openings for accommodating the tube ends, with the openings being subdivided into three sections in axial extension. The center section has the smallest cross-section and the end sections are in each case widened. The elevations extend on both sides of the tube plate, the total height of the elevations located in the area of an opening, inclusive of the tube plate thickness, being about 1.8 to 2.5 times the single tube plate thickness.

Abstract: A ventilation unit for heating or air-conditioning in a motor vehicle. The unit includes a blower and a heat exchanger, with a diffuser positioned in the flow of air from the blower. The diffuser spreads the air flow so that it substantially covers the heat exchanger area. A grid positioned between the diffuser and the heat exchanger aids in spreading the flow of air to the peripheral portions of the heat exchanger.

Abstract: For the filtering of supply air, especially in the case of motor vehicles, a filter that is divided into two parts is arranged inside a housing. The two parts of the filter can be swivelled apart around swivel shafts arranged in their end areas so that, when required, an air passage means can be exposed for the passage of unfiltered air.

Abstract: Disclosed is a fluid friction clutch having front and rear working gaps, which are connected to one another in a manner which provides more continuous and uniform distribution of the torque-transmitting viscous medium between the gaps. The clutch includes at least one bore through the drive disk which separates the front and rear working gaps. The bore is positioned in annular grooves which are provided in the drive disk at the same radial distance as the bore and which further include baffles positioned in the grooves to block the flow of fluid around the annular grooves and to promote flow through the bore. A similar groove/baffle arrangement is provided as a return means on the rear side of the drive disk near to the outer periphery.

Abstract: Disclosed is a fluid friction clutch which comprises an input shaft, a primary disk connected to the shaft, and a secondary drive part, i.e., the clutch housing. The primary disk rotates in a work chamber arranged in the clutch housing and includes a reserve chamber in its interior. A fluid stream, which circulates between the work chamber on the secondary side and the reserve chamber on the primary side, is controlled via a valve attached to the primary disk. The valve is actuated via a tappet arranged coaxially in the input shaft. The orifice of the valve is arranged on the end face of the primary disk, and the associated valve closure element is located in the interior of the reserve chamber. An overflow orifice is present on the circumference of the primary disk in conjunction with a baffle, whereby pumping of the fluid from the work chamber into the reserve chamber is achieved. This fluid friction clutch is used, preferably, as the fan drive means for a radiator in motor vehicles.

Abstract: A carrier matrix for a catalytic reactor for the purification of the exhaust gas of internal combustion engines, comprising a flat foil and a corrugated foil arranged in alternating layers. Exhaust gas flows through the ducts formed by the corrugations of the corrugated foil and the flat foil surface. The corrugations have a plurality of segments fluidly connected behind one another in flow direction, but are transversely staggered with respect to flow direction. This staggered arrangement increases the turbulence of the gas flowing through the ducts, thereby increasing the effectiveness of the matrix. The matrix can be manufactured in a simple manner yet permits a good utilization of the catalyst materials coated on the foils.

Abstract: Disclosed is a heater for installation on the floor or in the side walls of a motor vehicle. The heater installation comprises a first rigid plate and a second rigid plate which is firmly joined to the first rigid plate. One plate comprises a plastic material. In addition, a channel for a liquid medium is disposed between the plates and has at least one indentation therein. The heater also has an inflow pipe and an outflow pipe, wherein the channel extends from the inflow pipe to the outflow pipe.

Abstract: Disclosed is a fluid friction clutch, wherein the force is transmitted from the driving to the driven member by means of the shear forces of a viscous medium located in gaps between the working surfaces of the driving and the driven sides. The transmittable force may be regulated by means of the degree of filling of the gap with the viscous medium as a function of external parameters. A fluid friction clutch of this type is characterized in that the drive and the driven members are elements of an at least three-member planetary transmission, wherein the individual elements of the planetary transmission engage each other through gaps, which in turn serve to receive the viscous medium, thereby effecting the transmittal of the force. It is possible with this clutch to obtain selected gear ratios between the driving and the driven members, in particular stepping up to higher speeds, even though the force is transmitted by fluid friction only.

Abstract: Disclosed is a method and apparatus for controlling the output speed of a fluid friction clutch. The fluid friction clutch comprises a work chamber, in which a drive disk rotates, and a reservoir. A valve controls the circulation of a viscous medium between the work chamber and the reservoir. The output rotational speed is thus dependent on the filling ratio of the work chamber. The valve is actuated as a function of at least one control parameter by means of a stepping motor connected with the clutch. The control parameter is preferably the temperature of the cooling medium of an internal combustion engine. The rotational output of the stepping motor is converted to a linear motion to actuate the valve lever by means of a spindle drive.

Abstract: A slide valve with a partial-vacuum actuator, especially for motor vehicle heating and air conditioning units, comprising a valve housing having a bottom; a slide for opening and closing the valve; a slide chamber for slidably containing the slide; an actuating rod connected with the slide, and for actuating the slide; a partial-vacuum actuator for actuating the actuating rod, and having a first housing section integral with the valve housing; a flat seal for sealing the sliding chamber, and for surrounding and sealing the actuating rod; a support for holding the flat seal against the bottom of the valve housing; and a bayonet mount with detent mechanism for fastening and securing the support inside the first housing section.

Abstract: Disclosed is a fluid friction clutch controlled as a function of temperature and/or rotation speed, comprising a driving primary member comprising a first reservoir chamber and an overflow orifice, wherein the primary member further comprises a device, responsive to the rotation speed of the primary member, for controlling the flow of a working fluid through the overflow orifice; a driven secondary member surrounding the primary member and optionally comprising a partition which defines a second reservoir chamber; a working chamber disposed between the primary and secondary members, optionally comprising pump means for controlling the flow of working fluid from the working chamber to the second reservoir, and an optional valve, located in the partition and being responsive to temperature, for controlling the flow of working fluid between the second reservoir chamber and the working chamber.