Abstract: A fluid friction clutch comprising a rotatable assembly comprising a clutch housing member and a clutch cover member defining a working chamber therein, the working chamber being connected with a working fluid reservoir, valve lever means in said reservoir for controlling the admission of working fluid from the reservoir to the working chamber where it serves to transfer torque between a rotatable disc disposed in the working chamber and said rotatable assembly, means for actuating the valve lever means comprising a pressure chamber formed from a pressure chamber housing and a flexible membrane carrying a pressure plate which directly engages the valve lever means, the pressure chamber housing and membrane being joined to the rotatable assembly to rotate therewith, and means for introducing a pressure medium such as compressed air into said pressure chamber to actuate the valve lever means and control the admission of working fluid from the reservoir into the working chamber, said pressure medium introducing

Abstract: A hydraulic coupling which includes a primary coupling part having a pot-shaped pulley or sheave, and a secondary coupling part including a housing provided with a cover. The primary and secondary parts are supported relative to one another in such a manner that they can rotate and the pot-shaped pulley or sheave is located in a working compartment formed in the housing. The working compartment is connected by way of a recycling arrangement, including a bore in the cover, to a supply channel to enable a recycling of the coupling fluid. A circumferential surface of the pulley or sheave is provided with spiral or thread-like grooves. At least one baffle or dam body is provided in order to pump off the coupling fluid from the working compartment. The housing is provided, in an interior thereof, with a circumferentially extending channel having an axial length or width when extends over a portion of a depth or axial length of the pulley or sheave.

Abstract: Disclosed is a heat exchanger, preferably for use in automotive vehicles, comprising a plurality of parallel tubes and a plurality of ribs extending the tubes, together with lateral parts fastened to the ends of the ribs. According to the invention, the lateral part consists of a strip applied against the ends of the ribs and joined with the ribs by means of an adhesive or by the embedding of the rib ends into the material of the strip. Also disclosed is a process for the manufacture of heat exchangers of this type.

Abstract: A double-tube radiator composed of at least one double tube, preferably of aluminum, the tube being composed of two tubes arranged concentrically, one inside the other, with distributor stubs disposed at their end areas. Each of the stubs have a neck with a supply channel running perpendicular to the longitudinal axes of the tubes, through which neck the oil or the like to be cooled is fed to or removed from the double tube. Provision is made for the distributor stubs to be designed as a sealing plug with cylindrical connecting areas mountable coaxially to the ends of the inner and outer tubes forming the double tube, said plug being provided with a chamber communicating with the supply channel, said chamber being located between the connecting areas for the tubes.

Abstract: A radial blower, especially for heaters and/or air conditioning systems of motor vehicles. The radial blower including a housing having a front portion provided with an air intake opening and a back portion provided with discharge or exit openings. The housing is adapted to accommodate a drive motor for a fanwheel which is manufactured as a one piece plastic part. The fanwheel includes a fan ring with fan blades and a hub. A spacer is provided for connecting the fan ring with the fan blades. A spacer is provided with openings having spokes disposed therebetween. The spokes constitute a bundle of springs connected in parallel. Openings in a back portion of the housing and/or the drive motor have a limited cross section for drawing in a sufficient flow of cooling air.

Abstract: A radiator for motor vehicles is provided which has several tubes opening to respective upper and lower radiator tanks and arranged parallel to one another for the guidance of heat exchange fluid. Heat exchange fins are disposed perpendicularly to the tubes and are fixedly connected thereto. The fins exhibit respective cut-out openings forming a groove at at least one of the surfaces of the fin blocks, which groove expands toward the inside and serves for connecting lateral parts, which lateral parts grip with tabs into the groove formed by the cut-outs. Each lateral part is formed of two halves which are pivotally connected with one another along an axis running in the direction of the groove and which are provided with tabs which extend outwardly over the lateral edges of the halves into the groove and abut the fins on the lateral walls of the groove. To form a rigid or stiff connection between the lateral part halves after their installation in the groove, locking or closing elements are provided.

Abstract: Disclosed is a method for controlling the volume of a fluid, e.g., air, moving through a duct system, e.g., a ventilating system for a vehicle, comprising the steps of moving the fluid through an inlet of the duct system under dynamic pressure; conducting the fluid through the duct system by means of propulsion system driven by an electric motor, wherein the electric current drawn by said motor varies with changes in the dynamic pressure; and adjusting the amount of fluid admitted into the duct system in response to the current drawn by the motor and thus, also responsive to the dynamic pressure, this adjusting step thereby maintaining a constant volume of fluid moving through the air duct system. Also disclosed is an apparatus for carrying out this method.

Abstract: A method is disclosed for clamping together a first and a second part, the first part having a flange thereon, the second part having a groove which may receive the flange. The method includes the steps of placing a deformable seal on the bottom of the groove of the second part, placing the flange of the first part on the deformable seal as the flange is guided into the groove, clamping the first and second parts together while deforming the seal until the seal approximately fills a space defined between a lower surface of the flange and the walls forming the groove, and deforming certain parts of a vertically upright standing area of the second part by rolling the certain parts of the area over an upper surface of the flange into generally horizontal positions while leaving other parts of the area generally in their vertically upright condition to thereby form an approximately corrugated edge on the second part, which holds the first and second parts together in a clamped condition.

Abstract: Air conditioning apparatus for conditioning the air supplied to a vehicle passenger space is provided which includes an air conditioning air cooling evaporator and an air heater unit arranged in series. An evaporator bypass duct extends in bypassing relationship to the evaporator and a heater bypass duct extends in bypassing relationship to the heater. To control the temperature of the air conditioned by the apparatus two temperature mixing air flaps are provided, one air flap controlling the proportion of air flow through the evaporator and its bypass duct and the other air flap controlling the proportion of air through the heater and its bypass duct.

Abstract: A fan wheel or pre-guide wheel for axial or semi-axial air flow, especially for use with the cooling systems of motor vehicles. In order to provide for advantageous stream line flow, the leading surfaces of the fan wheel hub or an upstream pre-guide wheel hub are suitably rounded providing for a generally increasing hub diameter in the direction of the air flow. In order to simplify the casting or extrusion of the fan wheel so configured, the invention provides for a substantially cylindrical or conically decreasing hub diameter in the region of the fan hub lying generally behind each fan blade. For fan hubs of relatively low axial depth, for example with riveted fan blades, the gaps may remain uncovered without detrimental effects on the air stream.

Abstract: A fluid clutch composed of a primary part with a drive disc and rotatably mounted relative to a secondary part with a cover is constructed so that the drive disc is disposed in a working chamber formed in the secondary part, the working chamber communicating through a return channel with a supply chamber formed in the secondary part for returning the clutch fluid from the working chamber to the supply chamber by action of a retarder provided in a gap between the circumference of the drive disc and a radial boundary of the working chamber. A control element disposed in a control chamber is displaced axially relative to the drive disc and is located in the secondary part.

Abstract: A control system for controlling the operation of a heating or air conditioning system, especially for the passenger compartment of motor vehicles. The temperature in the compartment is maintained by an electronic controller which receives temperature-related signals from one or more temperature sensors. The electronic controller is connected to an air pump which may be operated as a source of pressure or vacuum and is coupled to a pneumatic actuator which moves a final control element, for example an air flow valve or a cooling water valve. The air pump supplies a continuous and reliable source of pressure or vacuum independently of the engine manifold vacuum. The air control conduit is coupled to a ventilating line which communicates with the atmosphere through a fixed or variable throttle.

Abstract: Disclosed is a fluid friction clutch, comprising a drive disk having at least one first working surface; a housing enclosing said drive disk and being mounted rotatably with respect thereto, the housing including at least one second working surface in spaced relationship with the first working surface to form a gap therebetween; a device for selectively introducing a fluid working medium into the gap; and a device for removing the fluid working medium from the gap, wherein the first and/or second working surfaces comprise roughened surfaces.

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 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 relates to a radial fanwheel, wherein the fan blades are connected to a hub by spokes. Each fan blade is connected by connecting elements to the adjacent fan blades in the vicinity of their ends. Specifically, the spokes and connecting elements, as well as the fan blades themselves, are elastically deformable by the loads which develop.

Abstract: A circuit, safe against an overload, for incrementally varying the power to an electric blower motor used for heating, ventilating and conditioning vehicles, having a PTC resistor in series with other series resistors in the circuit.

Abstract: A cross-flow heat exchanger unit comprising a plurality of corrugated film elements stacked in alternating layers such that the ridges and grooves of each film element extend transversely to those of an adjacent film element. Flat divider elements are interposed between each pair of adjacent film elements, and the structure is enclosed by a coating which bonds the elements together to form a rigid heat exchanger block. The film elements may be of non-metallic material, and the coating may be a curable, synthetic resinous material.

Abstract: Disclosed is a fluid friction clutch, preferably for driving the fan in an automotive cooling system, comprising a driven disk member; a drivable housing member surrounding the driven disk member in such a manner as to provide a working chamber therebetween for receiving a fluid capable of transmitting rotational force between the driven disk member and the housing member; a reservoir separate from the working chamber for containing the fluid; a selectively openable and closable inlet orifice providing fluid communication between the reservoir and the working chamber; a return conduit providing fluid communication between the working chamber and the reservoir; and a supplemental disk member rotatable with the driven disk member and positioned within the reservoir so as to be wetted by the fluid at least when the fluid friction clutch is at rest.

Abstract: Disclosed is a fluid circuit, comprising a fluid outlet; a primary fluid flow line having a first section coupled with the fluid inlet and a second section coupled with the fluid outlet; an on-off type control valve and a heat exchanger located in the primary fluid flow line; a bypass fluid flow line connected in parallel to the heat exchanger to provide fluid flow between the first and second sections bypassing the heat exchanger; and a valve positioned in the bypass line for permitting fluid flow in the bypass line in the direction of the fluid inlet. Also disclosed is an automotive vehicle heating and cooling system containing the fluid circuit as the vehicle interior compartment heating system.

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.