Abstract: A plate heat exchanger, in particular an oil cooler for internal combustion engines, in a stacking mode of construction, provides conduits projecting toward one side for formation of feeding and drainage channels. Each conduit typically is provided with an edge bent inwards and running parallel to the base of the neighboring plate. The collar forming the conduit projects sufficiently far from the base of the plate that the edge projecting inwards can abut the base of the neighboring plate. This configuration reduces the heat exchange surface. To eliminate this problem, instead of collars with an encircling edge projecting only toward one side, collars projecting toward both sides are provided. Each of the collars is formed conically and engages, on stacking, into another of the collars. The collars are formed identically, but on plates which, when set on one another, are turned 180° with respect to the other, thus making simple soldering and simple handling possible.

Abstract: A tube-block-type heat transfer device has a tube block consisting of several tubes arranged side-by-side, having spacing elements which are inserted between two adjacent flat tube end areas respectively, and have in each case at least one connection duct along each transverse side of the tube block. The tubes are sealed off on the end side and are provided with transverse openings in their two end areas, which transverse openings are in a connection-duct-forming connection with spacing element transverse openings. At least one pair of separation spacing elements 5a, 5b situated opposite one another in the same space between two tubes have a closed construction so that, on each transverse side of the tube block, at least two mutually separated connection ducts is are formed so that several fluids can flow separately through pertaining tube block sections. The heat transfer device is especially useable as an oil/air cooler for motor vehicles for cooling engine and transmission oil.

Abstract: An impact-resistant material protective cover is disclosed for covering a stacking-disk heat exchanger which in used in a motor vehicle as an oil/coolant cooler. The protective cover may be formed from two identical cover shells having innerengageable locking detent elements for connecting them together in position around the circumference of the cooler housing.

Abstract: A plate heat exchanger comprises a plurality of heat exchanger plates stacked one above the other. The plates each have a peripheral edge projecting from its plate plane. The heat exchanger plates succeeding one another in each case are sealingly connected at their edges, so that flow ducts for at least two heat exchange media form between the plates. Each of these flow ducts is connected via openings in the heat exchanger plates to at least one other flow duct, so that a first heat exchange medium can flow through a first group of ducts loaded in parallel and a second heat exchange medium can flow through another group. So that a heat exchanger constructed in this way offers a satisfactory heat transmission capacity even in the case of widely varying volume flows of the media involved, the openings for the first heat exchange medium have a substantially larger cross section than the openings for the second heat exchange medium.

Abstract: Known constructions of oil coolers for motor vehicles are generally fastened directly by means of the base plate on the engine block and are therefore subjected to extremely high lateral acceleration forces during the operation of the engine. Stacking disk oil coolers, as a rule, do not withstand such forces because the lowest disk may deform during the operation so that the effectiveness of the cooler becomes questionable. It is suggested to arrange a reinforcing plate between the lowest plate of the stacking disk oil cooler and a base plate, which reinforcing plate is provided with a rim surrounding the edge of the lowest plate. This measure increases the stability of the stacking disk oil cooler so that it can be fastened directly to the engine block.

Abstract: A heat exchanger has flat tubes arranged in parallel to one another and at a distance from one another. The flat tubes are provided in the area of their ends with connection openings to adjacent flat tubes to avoid difficulties with respect to the tight closing of the open front ends, massive slide-in parts are introduced into the open tube ends. The walls of the flat tubes at least on the narrow sides against the slide-in parts. The slide-in parts therefore act as adapting pieces which determine the final form of the tubes. They cause a tight and pressure-resistant connection after the soldering.

Abstract: Known disk oil coolers, when they are to be used without an oil filter, are provided with a separate housing cover which, by means of a sealing device, is disposed on a ring surface of the housing and is held on the housing by way of a hollow screw. These constructions require a large amount of space. It is disclosed to provide the hollow screw, on the side of the driving surfaces for a screwing tool directed toward the housing, with an end disk which is provided with a sealing surface resting against an annular wall of the housing. On the side of the end disk facing the housing, an opening is provided which leads into the interior of the hollow screw. This hollow screw may be used instead of the hollow screw to be provided for the use with the filter. Elaborate modifications or other housings are not required.

Abstract: The invention relates to an oil cooler, especially for cooling the transmission oil of a motor vehicle, which includes a guide channel for the oil to be cooled extending in a region where it is subjected to a cross-flow of a cooling medium. The oil guide channel is constructed with two walls of folded, curved sheet metal, between which walls the oil is guided. The folded sheet metal cooler construction offers an improved heat exchange capacity as compared to previously used double pipe or double tube coolers. In especially advantageous embodiments of the invention, the oil is restrictively guided through the folded sheet metal cooler body so that a long path or passage for the flow-through of the oil results, whereby the heat exchange capacity is yet further increased.

Abstract: An oil cooler arrangement for internal-combustion engines is described which is used in particular for installation between the engine and an oil filter. The heat exchange space of this oil cooler through which the oil flows is formed as a housing chamber into which a heat exchange body is tightly placed through which the coolant, in particular, water, flows. The heat exchange body includes many parallel pipes, the ends of which are held in the bottoms of two oppositely disposed coolant collecting spaces. This design permits the production of oil coolers without soldering or welding processes. The water flow-through through the parallel pipes is also exactly defined.

Abstract: A quiet cooling system for internal combustion engines includes a radial impeller and a ring radiator. The ring radiator is disposed in the vicinity of the circumference of the radial impeller and is spaced at a distance from the impeller. The ring radiator can be made integral or in the form of segments. The radiator includes cooling water tubes which are to carry water and have fins fastened thereto. The cooling water tubes run parallel to the fan axis and are positioned parallel to the flow direction of cooling air leaving the radial impeller.