Abstract: In an internal-combustion engine, the light-metal cylinder head 1 is bolted together with the cylinder crankcase 2 by means of bolts 9, which extend in each case through a bore hole 10 in the cylinder head 1 and are bolted into a threaded borehole 11 in the cylinder crankcase 2. In order to keep the surface pressure, when the cylinder head bolts are tightened, at a level permissible for the light-metal alloy of the cylinder head 1 without using shims that require much space, a threaded sleeve 15 of steel, on the face 17 of which the head of the cylinder head bolt 9 is lying, is screwed into the borehole 10. The bearing surface for the force of the bolt is formed by the areas of the edges of the thread of the threaded sleeve 15. Accordingly, a sufficient area can be made available by an appropriate number of threads without the need to have the external diameter of the threaded sleeve 15 larger than the external diameter of the bolt head 12, 13.

Abstract: A double-flow butterfly valve part (1) contains two butterfly valves (4 and 6), which are connected together by means of a coupling element (10). The second butterfly valve (6) is opened only when the first butterfly valve (4) is moved beyond a partially open position into the completely open position. To make it possible to shift the two butterfly valves (4 and 6) back by means of a single restoring spring acting on the first butterfly valve (4), a desmodromic control is provided between the coupling element (10) and the second butterfly valve (6). For this purpose, a lever (9) is disposed on the shaft (7) of the second butterfly valve (6). This lever (9) contains an arched slot (12), which is engaged by a roller (13) mounted in the coupling element (10). The coupling element (10), in turn, is provided with an arched slot (14), which is engaged by a roller (15) mounted in the lever (9).

Abstract: A cast iron camshaft (1) for an internal combustion engine, has at one end a toothed pulley (3) engaging a toothed belt, and an internal tensile member including a screw threaded bolt (5). The bolt engages part of the camshaft (1) adjacent the end where the toothed pulley (3) is fixed, and extends along a longitudinal bore (6), and has a screw threaded end (8) which engages an internal thread (9) positioned adjacent the point where the bending moment exerted on the camshaft by the toothed belt tension P becomes zero. As a result, the alternating bending loads which would otherwise occur in the vicinity of the cross-section X--X which is in danger, are converted into a continuous compressive load, which can be sustained by the cast iron material more effectively than an alternating bending load.

Abstract: On a multi-cylinder combustion engine with two overhead camshafts 7, 8, sprocket wheels 9 and 10 are mounted on the camshafts between adjacent cams in such a way that they are engaged by a drive chain 12 in opposite directions with an arc of contact exceeding 90.degree.. The chain 12 is driven by a drive sprocket 13 which is connected to a gear 14, which in turn is engaged with gear teeth 15 on the crankshaft 3. The non-driving strand of chain 12 is guided above sprocket wheel 9 by a curved guide rail 16, which is also designed to serve as a chain tensioner.

Abstract: In an internal combustion engine, the cylinder head 1 is screw-fastened to the cylinder crank case 2 by means of differential screws 8, each of which has two threaded sections 11 and 12, of which section 11 has a larger outside diameter and a smaller pitch than the second section 12. The threaded sections 11 and 12 cooperate with corresponding internal threads 13 or 10 in the cylinder head 1 or in the cylinder crank case 2. As a result of the different pitches of the two threaded sections 11 and 12, there occurs a joint tensioning of the cylinder head 1 with the cylinder crank case 2, without a bearing surface for a screw head or a nut being required. The space requirement for the cylinder head fastening thereby becomes exceptionally small, so that the fastening can be provided at points, for example, between adjacent valves, at which no space would otherwise be available for a bearing surface for screw heads or nuts.

Abstract: An exhaust gas turbo-supercharger for a vehicle engine, which is connected via engine mounting to the chassis of the vehicle and is provided with an exhaust gas turbo-supercharger. The supercharger has a bearing housing 1 which is provided with lubricant and coolant passages 5 and 6 or 8 and 9, and which is designed to form an engine mounting. The housing is connected to the vehicle chassis 21 by an elastic bearing 20, and is flange-mounted to a surface 11 of the cylinder crank case 12. The lubricant and coolant passages 5 and 6 or 8 and 9 open in the abutment surface 10 of the bearing housing 1 against the cylinder crank case 12 and are in communication with the lubricant and coolant circuit 14 and 15 or 16 and 17 of the engine.

Abstract: In a fluid-cooled cylinder head for a series of cylinders of a multi-cylinder internal combustion engine provided with a combustion chamber for each cylinder, the cooling water chambers co-ordinated with the individual combustion chambers are separated from each other, so that individual small casting cores can be used instead of a large casting core forming all the cooling water chambers of the cylinder head. The appropriate number of small casting cores can be inserted into the mould according to the number of cylinders, so that cylinder heads for cylinder blocks with different numbers of cylinders can be manufactured, using several casting cores. The cooling water chamber for each combustion chamber is so designed that a single unipart casting core can be used, which is so shaped that the cooling water is directed against the wall of the combustion chamber and against the sparking plug dome.

Abstract: In a suction pipe installation for multicylinder internal combustion engine with a collector suction pipe, a suction distributor is connected therewith. Adjacently disposed individual suction pipes form a unitary unit with the collector suction pipe. The individual suction pipes extend from the flanges a curve of more than 90.degree. to connecting flanges. The collector suction pipe 1 is mounted in the chamber enclosed by the individual suction pipes, so that it does not require any additional space. A quiet airflow is formed in the straight line segment of the collection suction pipe 1, and in which an air amount meter 18 for a fuel injection installation is installed.

Abstract: In order to be able to enlarge the width of web 13 between adjacent valve seating rings 6 of a light-alloy cylinder head 1 for reciprocating internal combustion engines, an external diameter D1 of valve seating surface 11 at the valve seating ring is selected, which is smaller than the external diameter D2 of the total valve seating surface 7. In order nevertheless to give valve seating ring 6 the required strength, the smallest internal diameter D4 is smaller than the internal diameter D3 of the valve seating surface. Throttling the flow is avoided by a transition from D4 to D3, which is advantageous to flow.

Abstract: A motor vehicle provided with a combustion engine, an alternator, a battery and a heating installation for the passenger cabin has a heating unit which comprises a heating circuit and a heating exchanger fed by the heating liquid for the heating of air. The alternator is liquid cooled and has a rotor and chambers adapted to receive cooling liquid and is switchable into the heating circuit; and the alternator has filed coils adapted to be short circuited. In this fashion the alternator is switchable as an eddy current brake. Furthermore, the alternator may be a liquid cooled alternator asynchronous generator, whereby its chambers which are cooled by the cooling liquid are switched to the heating circuit.

Abstract: A device for lubricating a rotary piston air pump driven by an engine penetrated by lubricating oil return conduits. The device includes a rotary housing including a casing and two side walls and rotatably mounted on a stationary axle having an eccentric thereon. The axle penetrates the housing perpendicular with respect to the side walls and receives on its eccentric a rotating piston, which is in camming engagement with the casing and limits volume changing operating chambers. The surface of the eccentric on which the piston is mounted is provided with a recess in communication with a suction conduit and a recess in communication with a discharge conduit. The piston has control openings for successively communicating the recesses with the operating chambers during rotary movement of the piston.

Abstract: An outlet valve for a gas compressor includes a valve seat 1 formed with several rows of apertures 16, a thin flat valve plate 2 having several spaced spring tongues overlapping the apertures, a limit plate 4 overlying the valve plate, and a pressure member 5 above the limit plate. To control and damp the movement and flutter of the valve plate it is frictionally gripped between the limit plate 4 and the valve seat, and springs 15 press the limit plate against the valve plate. Both the valve plate and limit plate can move towards and away from the pressure member 5, this movement being restricted to a fraction of a millimeter by spacer bushes 14 and spacer studs 7. The underside of the limit plate 4 is concavely curved to correspond to the natural bending curvature of the thin valve plate.

Abstract: A rotary compressor includes a casing 1 having a curved rotor chamber 2 in which is mounted a rotor 6. The compressor has an outlet valve 10 consisting of two valve units 10a, 10b which are located on inclined support surfaces 12 and outlet passages 11 from the chamber 2 open into the surfaces 12. Each valve unit 10a, 10b consists of a valve seat 15, a valve plate 13 and a limit plate 14, the valve seat 15 having apertures which register with passages 11 and the valve plate 13 having apertures which are staggered from the apertures in the valve seat 15. The support surfaces 12 are positioned close to the chamber 2 so that the length of the passages is small and the "dead volume" between the chamber 2 and the valve plate 13 is reduced.

Abstract: A device for delivery control is provided in a rotary piston compressor which takes the general form of a housing which is composed of a shell and two parallel side parts and has an outlet duct and at least one lateral inlet duct, and a piston which is mounted on an eccentric of an eccentric shaft, and which in rotation, defines with the inner surface of the shell, working chambers which are variable in volume and which with axial seals located along its circumferential edges, overrides one of the inlet ducts. The improvement of the delivery control device is provided by at least one recess in one side part lying in the direction of rotation of the piston after the inlet duct, a withdrawable plug being disposed within the recess so that it is flush in its closed position with the side wall.

Abstract: Means are provided for controlling the oil cooling of the piston of a piston internal combustion engine with a lubricant circuit which contains a pump and an oil cooler and from which a branch pipe for cooling oil for the piston branches off.

Abstract: Internal seal for the piston of a rotary piston engine. The seal includes a slide ring with an annular scraping edge of L-shaped cross-section with an axial flange and a flange extending radially outward. The slide ring includes an axially extending ring with one face together with its inner periphery forming the scraping edge. The slide ring includes a radially extending ring with its inner periphery shrunk onto the outer periphery of the axial ring near the one face. The axial ring consists of a material having a smaller coefficient of heat expansion than the radial ring.

Abstract: The fluid-cooled rotary piston for a Wankel-type mechanism has a plurality of intersecting flank surfaces to form a multi-sided profile and a hub portion by which it is supported for rotation on a mainshaft. The rotary piston also has a closed-loop passageway for each flank surface extending in close spaced relation to the side faces of the rotor and the intersection of the flank surfaces. An inlet passage is provided for each closed-loop passageway to conduct to the latter, as the rotary piston rotates, pressurized cooling fluid from a source thereof. An outlet passage is provided for each closed-loop passageway to conduct heated cooling fluid from the latter to an area adjacent the hub portion. The outlet passage may be provided with a restricted flow area to insure that the associated closed-loop passageway is maintained full of cooling fluid.

Abstract: The improved sealing grid for a rotary internal combustion engine of the Wankel type comprises a transfer passage means intermittently communicating the space between the inner and outer seals with the working chamber in the exhaust phase, to pass spent combustion gas from the latter to said space and thereby intermittently pressurize the space behind the inner seal and thereby urge the latter into sealing contact with the adjacent wall.

Abstract: Two metal rings are produced having a concave C-shaped cross section, open in an axial direction. In particular, annular sealing members are formed by deep-drawing a strip, the outside diameter of one ring being slightly smaller than the inside diameter of the other ring.

Abstract: An interior seal for rotary piston engines in the form of a cast iron scraper ring is arranged for axial movement in an annular groove in one face of the piston; and an annular scraping edge of the seal slides along the interior surface of the neighboring end wall of the housing.