Abstract: An exhaust-gas recirculation device includes a distributor element (14) driven corresponding to the rotational speed of the camshaft (11) of an internal combustion engine (1), wherein, via the distributor element (14), a fluidic connection can be established from an exhaust-gas inlet channel (13) to respectively one exhaust-gas outlet channel (16) of a plurality of exhaust-gas outlet channels (16) corresponding in number to the cylinders. Advantageously, apart from the distributor element (14), use can be made of a control element (22) which is movable via an actuator (47) and by which clearing of the fluidic connection between the outlet opening (21) of the distributor element (14) and the exhaust-gas outlet channels (16) of the exhaust gas recirculation device (9) can be shifted in comparison to the phase angle of the camshaft (11).

Abstract: A device for the reduction of nitrogen oxides in the exhaust gas of internal combustion engines has a thermolysis reactor (10). In the thermolysis reactor (10), urea is converted into ammonia and isocyanic acid by means of the supply of heat. In a preferred embodiment of the invention, the thermolysis reactor (10) is arranged within the exhaust gas duct (26) and is thermally coupled to an oxidation catalytic converter (30) which is connected upstream of the thermolysis reactor (10) in the flow direction. As a result of the exothermic reactions taking place in the oxidation catalytic converter (30), it is possible for heating of the thermolysis reactor (10) to take place. In order to further increase the temperature, it is possible for fuel to be injected into the oxidation reactor (30) by means of a fuel supply device. The fuel is burned catalytically in the oxidation catalytic converter (30).

Abstract: An actuating device including a housing that is closed by a cover in such a way that both an electric motor and a gearbox unit are completely enclosed. An internal gear segment, arranged on an output shaft in a rotationally fixed manner, is positioned on a borehole of the cover. An axle on which a double toothed gear is arranged is then mounted on the output side, an a pocket hole in the cover. This reduces the overall length, as well as the number of components and the cost.

Abstract: A dental crown preparation instrument and method for producing same includes a first body produced by grinding, the first body having a substantially cylindrical shaft and a head connected to the shaft, the first body having outer dimensions being substantially equal to the finished preparation instrument, wherein a basic toothing is at first produced in the head by grinding and a secondary toothing is produced subsequently by grinding, wherein a cutting rate of 15 to 40 m/sec is selected for the grinding process, wherein the grinding wheel is moved with a feed rate of 10 to 50 mm/min and the grinding wheels have diamond particles and have a grain size of 15 to 62 ?m, and wherein the toothings have cutting edges featuring a surface roughness of not more than 2.5 ?m.

Abstract: Proposed is an exhaust-gas recirculation device comprising a distributor element (14) being driven corresponding to the rotational speed of the camshaft (11) of an internal combustion engine (1), wherein, via the distributor element (14), a fluidic connection can be established from an exhaust-gas inlet channel (13) to respectively one exhaust-gas outlet channel (16) of a plurality of exhaust-gas outlet channels (16) corresponding in number to the cylinders. Advantageously, apart from the distributor element (14), use can be made of a control element (22) which is movable via an actuator (47) and by which the clearing of the fluidic connection between the outlet opening (21) of the distributor element (14) and the exhaust-gas outlet channels (16) of the exhaust gas recirculation device (9) can be shifted in comparison to the phase angle of the camshaft (11).

Abstract: Air control valve apparatus (1) for internal combustion engines (2) having a turbocharger (3), wherein the air control valve apparatus (1) is arranged in a bypass channel (4) between the pressure side (5) and the suction side (6) of a boost pressure pump of the turbocharger, having a housing (7) which has an electromagnetic drive unit (8) having a coil (9), a yoke (10) and a core element (11), and a valve unit (12) which can be moved in the housing (7), wherein means (13) are provided which hold the movable valve unit (12) in the closed position in the currentless state, and wherein at least one pressure equalization opening (14) is provided on the movable valve unit (12), wherein the at least one pressure equalization opening (14) can be closed by at least one switching element (15).

Abstract: The invention relates to a controllable two-way valve (1), in which a valve rod (3) is connected in a permanent manner to at least two valve members (4, 5, 6, 24, 25; 39, 40), the valve rod (3) being actuated by means of an actuator (2). The housing (7) comprises an inlet (8; 4) or outlet and two corresponding outlets (9; 32; 42), (10; 28; 43) or inlets. According to the invention, the two valve members (4, 5, 6; 24, 25; 39, 40) correspond with at least two valve seats (12, 17, 22; 29, 37, 38; 46, 47) and the two or more valve members (4, 5, 6; 24, 25; 39, 40) have three control surfaces (11, 13, 18; 26, 27, 31; 44, 45, 48). The invention thus provides a dirt-resistant valve, which is easy to operate, has fixed valve members and does not require additional equipment. Said valve permits both the inlet to be completely blocked and the two outlets to be controlled independently of one another.

Abstract: The invention relates to a controllable two-way valve, in which a valve rod is connected in a permanent manner to at least two valve members, the valve rod is activated by means of an actuator. The housing comprises an inlet or outlet and two corresponding outlets, or inlets. According to the invention, the two valve members correspond with at least two valve seats and the two or more valve members have three control surfaces. The invention thus provides a dirt-resistant valve, which is easy to operate, has fixed valve members and does not require additional equipment. The valve permits both the inlet to be completely blocked and the two outlets to be controlled independently of one another.

Abstract: The invention relates to an actuating device comprising a housing that is closed by a cover in such a way that both an electric motor and a gearbox unit are completely enclosed. According to the invention, an internal gear segment, arranged on an output shaft in a rotationally fixed manner, is positioned on a borehole of the cover. An axle on which a double toothed gear is arranged is then mounted on the output side, by means of a pocket hole in the cover. The inventive embodiment enables the overall length and the number of components used to be reduced, leading to an optimization of the cost of the cited actuating device compared to known actuating devices.

Abstract: A vehicle has at least one fuel tank for holding a fuel for the operation of a vehicle propulsion system. A fuel tank is arranged in an area in front of a front axle or behind a rear axle. Structure is provided for executing a controlled deflection movement of the fuel tank, so that in the event of an impact a movement can be executed shifting the fuel tank towards the front axle or rear axle.

Abstract: The invention relates to a surgical saw blade having a flat, plate-shaped body (1) being provided with a toothing (2) at least one edge portion, said toothing comprising a plurality of uncrossed teeth, said teeth each consisting of groups comprising three teeth (3, 4, 5) of different shape, or wherein the toothing (2) comprises pairs (5, 6) of two teeth (3, 4) being arranged symmetrically to each other in relation to a plane perpendicular to the center plane of the body (1).

Abstract: A vehicle has at least one fuel tank for holding a fuel for the operation of a vehicle propulsion system. A fuel tank is arranged in an area in front of a front axle or behind a rear axle. Structure is provided for executing a controlled deflection movement of the fuel tank, so that in the event of an impact a movement can be executed shifting the fuel tank towards the front axle or rear axle.

Abstract: A valve unit for internal combustion engines with a drive unit, a gear mechanism, a valve rod and a valve disk, the gear mehanicm being provided with an eccentrically disposed coupling part which is connected coactingly with the valve rod, the coupling part being a bearing element which serves as a connection means with the valve rod. A combustion-air intake-channel portion and an exhaust-gas return unit are integrally combined with the valve unit.