Abstract: An electromagnetic vibrator for seismic and civil-engineering applications is provided with a supporting structure fitted with a coupling element, and a reaction mass, which is to be caused to vibrate, with an electromagnetic drive associated therewith and provided at least with electromagnetic coils. The reaction mass is magnetically suspended on the supporting structure by means of one or more magnets with the associated electromagnetic coils and is at the same time caused to vibrate by the electromagnetic drive. The vibration force is exerted on the pole surface of the one or more magnets and the reaction mass is accelerated to at most the acceleration due to gravity.

Abstract: In a reciprocating internal-combustion engine, a power unit comprises cylinders 1, cylinder heads 2, pistons, connecting rods, a crankshaft and crankshaft bearings. Soundproofing supporting members mount the ends of the power unit in an outer pan 7 which is connected to a flywheel housing 8. Soundproofing supporting members 12, 12a, 13 are coaxial with the crankshaft and center the power unit and hold it against substantial axial movement in the outer pan. An oil seal 14 is fitted between the power block and the top rim of the outer pan.