Abstract: Disclosed is an evaporator, particularly for air conditioning installations in automotive vehicles, comprising an evaporator block including several evaporator tubes and coolant supply means. The coolant supply means comprise an expansion valve, a feed tube and a manifold from which the evaporator tubes extend. A calming line segment for the coolant is arranged within the manifold. A distributing space connected with the calming segment is located adjacent to the calming segment. Means are provided for deflecting the coolant between the calming segment and the distributor space.

Abstract: An arrangement is disclosed for joining the tubes of a heat exchanger core to a connecting box, wherein the tubes are fastened to the connecting box and sealed, said tubes being secured to the connecting box by means of a friction joint and at least one space being provided for each tube surrounding the end of the tube; each said space comprising a cavity bounded by the connecting box and the tube or a corresponding recess, and being filled and sealed with adhesive material.

Abstract: The invention concerns a heat exchanger comprising a heat exchanger block having a plurality of tubes and fins arranged transversely to the tubes, at least one tube plate and a water tank, both made of a synthetic plastic material. The tube plate has orifices to receive the ends of the tubes and the water tank is fastened in a water tight manner to the tube plate. In order to obtain a simple and reliable joint of the heat exchanger tubes with the tube plate and the water tank with the tube plate, the plastic tube plate is provided on one side with projections. The orifices are located in these projections and the ends of the tubes are mounted in these orifices by expansion in the radial direction or impression in the axial direction. Both the tube plate and the water tank are equipped with flat surfaces at their edges. These surfaces rest on each other and the tube plate is joined with the water tank by vibration welding on these surfaces.

Abstract: The invention relates to a method for joining tubular parts of a heat exchanger that are inserted into each other, as well as to a tool for practicing the method.

Abstract: Disclosed is a fan drive, in particular one for cooling installations of rail vehicles. The fan drive comprises a hydraulic motor and a control valve which regulates a bypass as a function of temperature, thus affecting the flow of a pressure medium driving the motor. The control valve comprises a control piston subjected to a control pressure in the direction of closing the bypass, and a counterbalancing pressure in the opposite direction from the source of the pressure medium. The control valve also comprises a control spring which biases the control piston in the direction of closing the valve, and a pilot valve which affects the control pressure. The pilot valve is actuated by an electromechanical servo component. The pilot valve is located in an insert which is arranged within the control piston. A central bore of the control piston is slidingly guided on the convex surface of the insert so as to form a seal.

Abstract: A regulator circuit for controlling the cooling and heating power for automotive vehicles, wherein signals proportional to the external temperature, the internal temperature of the vehicle, and the desired temperature are applied to an input amplifier, the output signal of this amplifier being applied as the desired value to the heating system. This output signal is also fed to a second amplifier which is furthermore supplied with the signal proportional to the external temperature. The output signal of this second amplifier serves as the desired value for the cooling system. By means of this arrangement, excessive cooling at the transition point between heating and cooling, as well as oscillation around this transition point, can be prevented. An economical reheat operation is made possible for dehumidifying the air by appropriate selection of resistor values such that the heating system and the cooling system are in simultaneous operation.

Abstract: An axial fan arrangement is provided, especially for the radiator of a water cooled internal combustion engine for commercial vehicles. In order to reduce noise levels without impairing fan efficiency, an air guide structure is provided which widens in the flow direction starting from adjacent the air inlet edges of the fan blades. Embodiments are included which have part of the air guide structure carried by the fan blades and other embodiments have fixed air guide structure. The contour of the air guide structure conforms to the facing contour of the fan blades.

Abstract: The invention provides a baffle arrangement for increasing the return flow pressure for clutch fluid in a fluid friction clutch of the type having a rotatable driving disk disposed to rotate in a work space of a relatively rotatable housing. The work space is separated by an intermediate disk fixed to the housing and clutch fluid return bore means are provided at the periphery of the intermediate disk. In order to prevent wearing of the baffle member and also to accommodate fixation of the baffle member in a minimum thickness clutch construction, the baffle member is supported at the intermediate disk in an oblong hole adjacent to the circumference thereof. The baffle member is guided for movement between respective circumferential end positions in the oblong hole, is axially fixed by a retaining washer or the like to the intermediate disk, and is guided so as to be radially immovable.

Abstract: The invention relates to a damming arrangement for controlling the return flow of clutch fluid in a fluid friction clutch of the type having a rotatable driving disk disposed to rotate in a work space of a relatively rotatable housing. The work space is separated by an intermediate disk fixed to the housing and a pair of clutch fluid return bores are provided at the periphery of the intermediate disk diametrically opposite one another. To optimize the guidance of the return flow of clutch fluid from the working space to the storage space, damming bodies are disposed adjacent the return bores, which damming bodies include a first guide surface portion extending radially inwardly of the return bores in a diagonal direction corresponding to the rotational direction of the driving disk and a second guide surface portion radially outwardly of the return bore extending diagonally outwardly and opposite of the rotational direction of the driving disk.

Abstract: A motor vehicle heat exchanger for independently heating different passenger areas comprising first and second tube/fin block units for transferring heat from coolant flowing through tubes thereof to air flowing therethrough to first and second passenger areas, respectively. Common upper and lower coolant reservoir tanks supply coolant to both tube/fin units and receive coolant returning therefrom respectively. Intake tubes extend through a common gap between the first and second tube/fin units to supply heated coolant to the lower cooling tank.

Abstract: Disclosed is a fluid friction clutch assembly, comprising a drive shaft; a primary disk mounted for rotation on the drive shaft; a driven clutch housing surrounding the primary disk and being rotatably supported with respect to the drive shaft, the clutch housing containing a partition therein defining a work chamber and a reservoir separated by the partition, wherein the partition includes in its radially outer area at least one overflow opening closeable by means of a valve lever comprised of a magnetic material and a return flow orifice associated with pump means for pumping a viscous torque-transmitting medium from the work chamber to the reservoir; a pulley member mounted on the drive shaft for driving the shaft and means, associated with the pulley member, for selectively magnetically actuating the valve lever, in order to selectively open and close the overflow opening.

Abstract: An evaporator apparatus comprises an evaporator assembly to which a coolant is supplied by an expansion valve and a flow divider. The connecting means between the expansion valve and the flow divider is provided with at least one bend. The bend causes a non-homogeneous coolant flow at the flow divider, resulting in an uneven distribution of gaseous and liquid coolant to the individual evaporator pipe sets. A mixing element, provided directly upstream of the flow divider, has a flow cross-section which expands in the direction of the coolant flow, resulting in a brisk mixing of the gaseous and liquid coolant phases to provide a homogeneous mixture. Preferred embodiments of this mixing element include a cylindrical mixing cell having a preferred inlet diameter/cell diameter ratio, a tapered insert which first decreases and then increases the flow cross-section, and a simple screen. The two latter embodiments may be installed in pipes which have constant diameters.

Abstract: A radiator arrangement for water cooled combustion engines is disclosed, especially for use with commercial vehicles. The radiator cooling block, including the water boxes, are fastened at the vehicle frame by means of lateral support parts. The lateral support parts are provided with lateral mounting flanges which respectively extend over both ends of the water boxes and exhibit bores which are aligned with corresponding bores at the water boxes, whereby cotter pins or the like extending through the bores act as connecting pins to connect the parts together. This arrangement exhibits the advantage that the water boxes themselves are used as connecting traverse elements for the lateral support parts so that the lateral support parts and the water boxes form a stable frame construction which holds the soldered cooling block therebetween. Expensive soldered connections for the fastening of the lateral support parts is disposed with and the necessary reinforcing strength is formed by this frame construction.

Abstract: A heat exchanger wherein a plurality of individual tubular parts are connected with each other is provided having a common pressure element for tube connections arranged in a plane. According to FIG. 1, a pressure platen 6 is present, which consists of a material harder than that of the external tubular part and is equipped with a number of orifices 7 corresponding to the number of tube connections. The pressure platen 6 surrounds the outer and inner tubular parts inserted in each other, and the diameter of the orifices 7 is smaller, at least in part, than the external diameter of the outer tubular part. According to the process for the manufacture of the heat exchanger, all of the tube connections are produced simultaneously by means of pressing on the pressure platen. Each of the tube connections is effected by reducing the cross section by means of plastic deformation of at least the outer, tubular part, whereby a press fit of the tubular part is obtained.

Abstract: Disclosed is a heat exchanger comprising a plurality of parallel tubes and a plurality of ribs transverse to the tubes, and at least one connecting tank into which the tubes open. To obtain with simple and cost effectively produced means a uniform distribution of the fluid flowing through the heat exchanger over the heat exchanger tubes, the connecting tank has a chamber with a circular cross section and in the connecting tank a distributor installation is arranged which comprises a helical profiled body having an approximately stellate cross section which sealingly abuts with its ribs against the wall of the chamber. The partitions form a plurality of helical channels with one open and one closed end. An orifice is provided in the area of each channel for the passage of the fluid from the connecting tank into the tubes of the heat exchanger.

Abstract: A carrier matrix for use in the manufacture of a catalytic reactor for the purification of exhaust gases in an internal combustion engine of a motor vehicle is prepared by joining in wound form a corrugated steel sheet and a generally flat steel sheet, the sheets being joined in locations where they contact one another by the use of solder or brazing material. In one embodiment solder is applied in spots along the tops of the arches of the corrugated sheet, and after coiling the solder is activated by heating. In another embodiment, coiling is first carried out and then soldering is accomplished by the application of solder into one or both end faces of the coil.

Abstract: Disclosed is an evaporator comprising a connector member, a Venturi distributor connected to the connector member for receiving and distributing a coolant, wherein the Venturi distributor divides the coolant into a plurality of streams, a plurality of channels formed in a body which comprises an insert for the connector member for conducting the coolant streams from the Venturi distributor, the channels corresponding in number to the streams with each channel being positioned to receive one of the streams from the Venturi distributor, a plurality of evaporator pipes connected to the connector member in parallel flow arrangement, the pipes corresponding in number to the channels with each pipe being connected to one of the channels, thereby forming a continuous coolant flow path from the Venturi distributor via the channels to the evaporator pipes, and a collection chamber formed in the connector member for receiving the coolant from the pipes.

Abstract: The invention provides an improved attachment arrangement and method for attaching a temperature responsive bi-metallic strip to the housing of a fluid friction clutch of the type having a rotatable disk disposed to rotate in a work space of a relatively rotatable housing. The work space is separated from a clutch fluid reservoir by an intermediate disk fixed to the housing and the flow of clutch fluid into the work space is controlled by a valve lever which is movably mounted for controlling the opening of a bore through the intermediate disk. The valve lever is in turn controlled by a temperature responsive bi-metallic strip mounted at the cover of the housing and a movable member extending through the housing cover and engageable with the bi-metallic strip and the valve lever. The bi-metallic strip is held in place by being clamped under ribs provided at the front side of the housing cover and is held by means of tongues at the bi-metallic strip which are abuttingly engageable with the cooling ribs.

Abstract: Disclosed is an evaporator comprising a connector member comprising at least two plates located one above the other, a Venturi distributor connected to the connector member for receiving and distributing a coolant, wherein the Venturi distributor divides the coolant into a plurality of streams, a plurality of channels arranged as grooves on the surface of one of said two plates and covered by the other of said two plates for conducting the coolant streams from the Venturi distributor, the channels corresponding in number to the streams with each channel being positioned to receive one of the streams from the Venturi distributor, a plurality of evaporator pipes connected to the connector member in parallel flow arrangement, the pipes corresponding in number to the channels with each pipe being connected to one of the channels, thereby forming a continuous coolant flow path from the Venturi distributor via the channels to the evaporator pipes, and a collection chamber formed in the connector member for receivin

Abstract: An electromagnetic two-stage clutch for the driving of units, especially refrigerant compressors in motor vehicles. The clutch includes electromagnets and a drive disk. The drive disk is adapted to be frictionally engaged by driving a shaft of the unit with the aid of electromagnets through armature disks, selectively, by two pulleys of differing diameters. The pulleys are connected with a counter pulley by way of V-belts. The drive disk is mounted in a supported fashion in a neck of the unit and is arranged between the two pulleys. One pulley is supported on the outside or outer surface of the neck of the unit.