Abstract: A fuel-exchange poppet valve of a reciprocating internal-combustion engine is actuated by two electromagnets that, in an alternating way, are energized periodically to attract an armature disk arranged between them. The armature disk is fastened at an armature that is coupled to a one-armed fuel-exchange poppet valve control lever. The control lever is pivotally moved back and forth against the spring tension of a torsional bar spring to open and close a poppet valve.

Abstract: The chain drive of a reciprocating-piston internal combustion engine is tensioned on the loose strand by a double-armed, rotatably mounted tension bar cooperating with a chain tensioner. A sliding bar bears against the driving strand. A similar base member is used for the tensioning bar and the sliding bar.

Abstract: The cylinder head and crankcase housing of an internal combustion engine cooperate with a frame, particularly a motorcycle underframe, to form a supporting unit. The internal combustion engine is secured to the underframe by holding members which cooperate with both the cylinder head and the crankcase housing. The cylinder head is disposed in a median plane of the cylinder and a support core is provided inside the cylinder head. This core is used as the point of attachment tie of the cylinder head. The support core is also continued in the crankcase housing. The support core and attachment tie are connected to one another by the interposition of bolts to provide an advantageous rigid engine mounting system.

Abstract: A water pump for a reciprocating piston internal combustion engine is driven by a shaft located between the camshaft and crankshaft. The intermediate shaft which is driven by and coupled to the crankshaft at one wall of the crank housing. The water pump is located in a remote wall of the crank housing, which itself forms one half of the pump containment. A dish-shaped housing half screws into the remote wall to contain the pump. The intermediate shaft is connected to the pump wheel of the water pump by a hollow shaft which passes longitudinally through the crank housing. Together with the bearings, securing elements, sealing rings and a bearing flange, the shaft forms a structural unit which may be pre-assembled and easily inserted into the engine.

Abstract: A reciprocating internal combustion engine includes at least one wet cylinder sleeve which is inserted into a cylinder crank housing. The upper portin of the sleeve is clamped between a cylinder head and a cylindrical receptacle disposed inside the cylinder crank housing. Coolant flows through a space adjacent said upper portion. A lower portion of the cylinder sleeve is separated from the coolant and extends inside the receptacle. To achieve a favorable temperature pattern over the entire height of the cylinder sleeve, the coolant containing space has a broad cross-section in the upper portion of the cylinder sleeve formed by a constricted wall on the outer periphery of the cylinder sleeve. Furthermore, a closed annular air space is provided between the cylindrical receptacle and the lower portion of the cylinder sleeve.