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 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: 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: 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.

Abstract: A clamping connection for clamping two parts together. One part includes a flange and the other includes a deformable edge. When the parts are in their clamped condition, the edge has been deformed into a continuously corrugated configuration including alternate deformed and undeformed partial areas. The deformed partial areas positively and lockingly engage the flange when the flange and edge are in the locked condition. Thus, a positive joint is formed. The undeformed partial areas of the edge contribute to stiffening the clamping connection.

Abstract: Disclosed is a device for opening a flanged joint of the type wherein one or more flange extensions on one flange part of the joint are bent around into engagement with the other flange part of the joint. A first leg member including a first generally tapered end portion is adapted to enter behind the bent-around flange extension of the flanged joint and engage the end of the bent-around flange extension. A second leg member includes a first end portion cooperating with the first end of the first leg member and having a generally flat contact surface on its side facing the first end portion of the first leg member, with the flat contact surface being adapted to engage and support the outer circumferential surface of the flanged joint. Preferably, the device includes a fluid cylinder attached to the second ends of the first and second leg members for selectively producing relative rotation of the leg members with respect to each other about a hinge connection.

Abstract: Disclosed is a light-weight deformable housing structure suitable for use as a collapsing component in a vehicle comprising a load-bearing lattice structure having a predetermined axis of collapse and a non-load-bearing skin enclosing the lattice structure. Also disclosed is a heater unit for a vehicle including a heater and a housing according to the invention surrounding the heater.

Abstract: An improved metallic heat transfer surface for heat transfer during change of phase of a medium in contact therewith and method of making. A smooth metallic surface is lightly etched to form evaporation and/or condensation nuclei. The nuclei are defined by peaks and valleys in the material, the peaks substantially extending to the envelope of the surface prior to etching and the vallyes extending into said material not more than 10.mu.(1.times.10.sup.-3 mm).

Abstract: The air flow between the outlet of a centrifugal fan and the inlet of a surrounding annular radiator or heat exchanger for cooling an internal combustion engine is made uniform by rounding the peripheral edges of the fan wheel support discs so as to enlarge the effective outlet channel for the air and to guide the air in the direction of the lateral regions of the radiator. One or more baffle rings controls the short circuit flow to the inlet of the fan as well as the leakage flow at the shaft side of the fan.

Abstract: A motor vehicle, especially a truck, with a cooling device for an internal combustion engine is disclosed. The cooling device comprises at least one heat exchanger which is mounted in an elevated position on top of or behind a cab of the vehicle. A liquid-collecting container is located at least beneath the heat exchanger of the cooling device to protect the vehicle occupants against scalding in the event the heat exchanger is damaged as in an accident.

Abstract: A heat exchanger, especially a double-flow or multiple-flow condenser for air conditioning units of motor vehicles which includes V-shaped tube forks installed in a heat exchanger body. The tube forks are connected at their ends by the tube elbows to tube forks located downstream in the flow direction, wherein an influx of heat exchange medium is distributed between two or among several of the first mentioned tube forks. The legs of all tube forks are arranged in one plane one below the other and their ends are connected by tube sections, with each of the tube sections bridging at least two ends of adjacent tube forks and extend laterally past each other.